src/actions.c
src/bindtests.c
src/guestfs.c
+src/launch.c
+src/proto.c
test-tool/helper.c
test-tool/test-tool.c
tools/virt-cat.pl
gettext.h \
actions.c \
bindtests.c \
+ launch.c \
+ proto.c \
libguestfs.syms
libguestfs_la_LIBADD = $(LTLIBTHREAD) ../gnulib/lib/libgnu.la
/* libguestfs
- * Copyright (C) 2009 Red Hat Inc.
+ * Copyright (C) 2009-2010 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
#define STRCASENEQLEN(a,b,n) (strncasecmp((a),(b),(n)) != 0)
#define STRPREFIX(a,b) (strncmp((a),(b),strlen((b))) == 0)
+#ifdef HAVE_GETTEXT
+#include "gettext.h"
+#define _(str) dgettext(PACKAGE, (str))
+#define N_(str) dgettext(PACKAGE, (str))
+#else
+#define _(str) str
+#define N_(str) str
+#endif
+
+#ifdef __linux__
+#define CAN_CHECK_PEER_EUID 1
+#else
+#define CAN_CHECK_PEER_EUID 0
+#endif
+
+#define UNIX_PATH_MAX 108
+
+#ifndef MAX
+#define MAX(a,b) ((a)>(b)?(a):(b))
+#endif
+
+#ifdef __APPLE__
+#define xdr_uint32_t xdr_u_int32_t
+#endif
+
+/* Network configuration of the appliance. Note these addresses are
+ * only meaningful within the context of the running appliance. QEMU
+ * translates network connections to these magic addresses into
+ * userspace calls on the host (eg. connect(2)). qemu-doc has a nice
+ * diagram which is also useful to refer to.
+ *
+ * NETWORK: The network.
+ *
+ * ROUTER: The address of the "host", ie. this library.
+ *
+ * [Note: If you change NETWORK and ROUTER then you also have to
+ * change the network configuration in appliance/init].
+ *
+ * GUESTFWD_ADDR, GUESTFWD_PORT: The guestfwd feature of qemu
+ * magically connects this pseudo-address to the guestfwd channel. In
+ * typical Linux configurations of libguestfs, guestfwd is not
+ * actually used any more.
+ */
+#define NETWORK "169.254.0.0/16"
+#define ROUTER "169.254.2.2"
+#define GUESTFWD_ADDR "169.254.2.4"
+#define GUESTFWD_PORT "6666"
+
+/* GuestFS handle and connection. */
+enum state { CONFIG, LAUNCHING, READY, BUSY, NO_HANDLE };
+
+struct guestfs_h
+{
+ struct guestfs_h *next; /* Linked list of open handles. */
+
+ /* State: see the state machine diagram in the man page guestfs(3). */
+ enum state state;
+
+ int fd[2]; /* Stdin/stdout of qemu. */
+ int sock; /* Daemon communications socket. */
+ pid_t pid; /* Qemu PID. */
+ pid_t recoverypid; /* Recovery process PID. */
+
+ struct timeval launch_t; /* The time that we called guestfs_launch. */
+
+ char *tmpdir; /* Temporary directory containing socket. */
+
+ char *qemu_help, *qemu_version; /* Output of qemu -help, qemu -version. */
+
+ char **cmdline; /* Qemu command line. */
+ int cmdline_size;
+
+ int verbose;
+ int trace;
+ int autosync;
+ int direct;
+ int recovery_proc;
+
+ char *path; /* Path to kernel, initrd. */
+ char *qemu; /* Qemu binary. */
+ char *append; /* Append to kernel command line. */
+
+ int memsize; /* Size of RAM (megabytes). */
+
+ int selinux; /* selinux enabled? */
+
+ char *last_error;
+
+ /* Callbacks. */
+ guestfs_abort_cb abort_cb;
+ guestfs_error_handler_cb error_cb;
+ void * error_cb_data;
+ guestfs_log_message_cb log_message_cb;
+ void * log_message_cb_data;
+ guestfs_subprocess_quit_cb subprocess_quit_cb;
+ void * subprocess_quit_cb_data;
+ guestfs_launch_done_cb launch_done_cb;
+ void * launch_done_cb_data;
+ guestfs_close_cb close_cb;
+ void * close_cb_data;
+
+ int msg_next_serial;
+};
+
struct guestfs_message_header;
struct guestfs_message_error;
extern void guestfs_error (guestfs_h *g, const char *fs, ...)
extern int guestfs___recv (guestfs_h *g, const char *fn, struct guestfs_message_header *hdr, struct guestfs_message_error *err, xdrproc_t xdrp, char *ret);
extern int guestfs___send_file (guestfs_h *g, const char *filename);
extern int guestfs___recv_file (guestfs_h *g, const char *filename);
+extern int guestfs__send_to_daemon (guestfs_h *g, const void *v_buf, size_t n);
+extern int guestfs__recv_from_daemon (guestfs_h *g, uint32_t *size_rtn, void **buf_rtn);
+extern int guestfs__accept_from_daemon (guestfs_h *g);
+
+#define error guestfs_error
+#define perrorf guestfs_perrorf
+#define safe_malloc guestfs_safe_malloc
+#define safe_realloc guestfs_safe_realloc
+#define safe_strdup guestfs_safe_strdup
+#define safe_memdup guestfs_safe_memdup
#endif /* GUESTFS_INTERNAL_H_ */
#include "guestfs-internal-actions.h"
#include "guestfs_protocol.h"
-#ifdef HAVE_GETTEXT
-#include "gettext.h"
-#define _(str) dgettext(PACKAGE, (str))
-//#define N_(str) dgettext(PACKAGE, (str))
-#else
-#define _(str) str
-//#define N_(str) str
-#endif
-
-#define error guestfs_error
-#define perrorf guestfs_perrorf
-#define safe_malloc guestfs_safe_malloc
-#define safe_realloc guestfs_safe_realloc
-#define safe_strdup guestfs_safe_strdup
-//#define safe_memdup guestfs_safe_memdup
-
-#ifdef __linux__
-#define CAN_CHECK_PEER_EUID 1
-#else
-#define CAN_CHECK_PEER_EUID 0
-#endif
-
static void default_error_cb (guestfs_h *g, void *data, const char *msg);
-static int send_to_daemon (guestfs_h *g, const void *v_buf, size_t n);
-static int recv_from_daemon (guestfs_h *g, uint32_t *size_rtn, void **buf_rtn);
-static int accept_from_daemon (guestfs_h *g);
-static int check_peer_euid (guestfs_h *g, int sock, uid_t *rtn);
static void close_handles (void);
-static int qemu_supports (guestfs_h *g, const char *option);
-
-#define UNIX_PATH_MAX 108
-
-#ifndef MAX
-#define MAX(a,b) ((a)>(b)?(a):(b))
-#endif
-
-#ifdef __APPLE__
-#define xdr_uint32_t xdr_u_int32_t
-#endif
-
-/* Network configuration of the appliance. Note these addresses are
- * only meaningful within the context of the running appliance. QEMU
- * translates network connections to these magic addresses into
- * userspace calls on the host (eg. connect(2)). qemu-doc has a nice
- * diagram which is also useful to refer to.
- *
- * NETWORK: The network.
- *
- * ROUTER: The address of the "host", ie. this library.
- *
- * [Note: If you change NETWORK and ROUTER then you also have to
- * change the network configuration in appliance/init].
- *
- * GUESTFWD_ADDR, GUESTFWD_PORT: The guestfwd feature of qemu
- * magically connects this pseudo-address to the guestfwd channel. In
- * typical Linux configurations of libguestfs, guestfwd is not
- * actually used any more.
- */
-#define NETWORK "169.254.0.0/16"
-#define ROUTER "169.254.2.2"
-#define GUESTFWD_ADDR "169.254.2.4"
-#define GUESTFWD_PORT "6666"
-
-/* GuestFS handle and connection. */
-enum state { CONFIG, LAUNCHING, READY, BUSY, NO_HANDLE };
-
-struct guestfs_h
-{
- struct guestfs_h *next; /* Linked list of open handles. */
-
- /* State: see the state machine diagram in the man page guestfs(3). */
- enum state state;
-
- int fd[2]; /* Stdin/stdout of qemu. */
- int sock; /* Daemon communications socket. */
- pid_t pid; /* Qemu PID. */
- pid_t recoverypid; /* Recovery process PID. */
-
- struct timeval launch_t; /* The time that we called guestfs_launch. */
-
- char *tmpdir; /* Temporary directory containing socket. */
-
- char *qemu_help, *qemu_version; /* Output of qemu -help, qemu -version. */
-
- char **cmdline; /* Qemu command line. */
- int cmdline_size;
-
- int verbose;
- int trace;
- int autosync;
- int direct;
- int recovery_proc;
-
- char *path; /* Path to kernel, initrd. */
- char *qemu; /* Qemu binary. */
- char *append; /* Append to kernel command line. */
-
- int memsize; /* Size of RAM (megabytes). */
-
- int selinux; /* selinux enabled? */
-
- char *last_error;
-
- /* Callbacks. */
- guestfs_abort_cb abort_cb;
- guestfs_error_handler_cb error_cb;
- void * error_cb_data;
- guestfs_log_message_cb log_message_cb;
- void * log_message_cb_data;
- guestfs_subprocess_quit_cb subprocess_quit_cb;
- void * subprocess_quit_cb_data;
- guestfs_launch_done_cb launch_done_cb;
- void * launch_done_cb_data;
- guestfs_close_cb close_cb;
- void * close_cb_data;
-
- int msg_next_serial;
-};
gl_lock_define_initialized (static, handles_lock);
static guestfs_h *handles = NULL;
return p;
}
-static int
-xwrite (int fd, const void *v_buf, size_t len)
-{
- const char *buf = v_buf;
- int r;
-
- while (len > 0) {
- r = write (fd, buf, len);
- if (r == -1)
- return -1;
-
- buf += r;
- len -= r;
- }
-
- return 0;
-}
-
void
guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
{
return g->recovery_proc;
}
-/* Add a string to the current command line. */
-static void
-incr_cmdline_size (guestfs_h *g)
-{
- if (g->cmdline == NULL) {
- /* g->cmdline[0] is reserved for argv[0], set in guestfs_launch. */
- g->cmdline_size = 1;
- g->cmdline = safe_malloc (g, sizeof (char *));
- g->cmdline[0] = NULL;
- }
-
- g->cmdline_size++;
- g->cmdline = safe_realloc (g, g->cmdline, sizeof (char *) * g->cmdline_size);
-}
-
-static int
-add_cmdline (guestfs_h *g, const char *str)
-{
- if (g->state != CONFIG) {
- error (g,
- _("command line cannot be altered after qemu subprocess launched"));
- return -1;
- }
-
- incr_cmdline_size (g);
- g->cmdline[g->cmdline_size-1] = safe_strdup (g, str);
- return 0;
-}
-
-int
-guestfs__config (guestfs_h *g,
- const char *qemu_param, const char *qemu_value)
-{
- if (qemu_param[0] != '-') {
- error (g, _("guestfs_config: parameter must begin with '-' character"));
- return -1;
- }
-
- /* A bit fascist, but the user will probably break the extra
- * parameters that we add if they try to set any of these.
- */
- if (STREQ (qemu_param, "-kernel") ||
- STREQ (qemu_param, "-initrd") ||
- STREQ (qemu_param, "-nographic") ||
- STREQ (qemu_param, "-serial") ||
- STREQ (qemu_param, "-full-screen") ||
- STREQ (qemu_param, "-std-vga") ||
- STREQ (qemu_param, "-vnc")) {
- error (g, _("guestfs_config: parameter '%s' isn't allowed"), qemu_param);
- return -1;
- }
-
- if (add_cmdline (g, qemu_param) != 0) return -1;
-
- if (qemu_value != NULL) {
- if (add_cmdline (g, qemu_value) != 0) return -1;
- }
-
- return 0;
-}
-
-int
-guestfs__add_drive_with_if (guestfs_h *g, const char *filename,
- const char *drive_if)
-{
- size_t len = strlen (filename) + 64;
- char buf[len];
-
- if (strchr (filename, ',') != NULL) {
- error (g, _("filename cannot contain ',' (comma) character"));
- return -1;
- }
-
- /* cache=off improves reliability in the event of a host crash.
- *
- * However this option causes qemu to try to open the file with
- * O_DIRECT. This fails on some filesystem types (notably tmpfs).
- * So we check if we can open the file with or without O_DIRECT,
- * and use cache=off (or not) accordingly.
- *
- * This test also checks for the presence of the file, which
- * is a documented semantic of this interface.
- */
- int fd = open (filename, O_RDONLY|O_DIRECT);
- if (fd >= 0) {
- close (fd);
- snprintf (buf, len, "file=%s,cache=off,if=%s", filename, drive_if);
- } else {
- fd = open (filename, O_RDONLY);
- if (fd >= 0) {
- close (fd);
- snprintf (buf, len, "file=%s,if=%s", filename, drive_if);
- } else {
- perrorf (g, "%s", filename);
- return -1;
- }
- }
-
- return guestfs__config (g, "-drive", buf);
-}
-
-int
-guestfs__add_drive_ro_with_if (guestfs_h *g, const char *filename,
- const char *drive_if)
-{
- if (strchr (filename, ',') != NULL) {
- error (g, _("filename cannot contain ',' (comma) character"));
- return -1;
- }
-
- if (access (filename, F_OK) == -1) {
- perrorf (g, "%s", filename);
- return -1;
- }
-
- size_t len = strlen (filename) + 64;
- char buf[len];
-
- snprintf (buf, len, "file=%s,snapshot=on,if=%s", filename, drive_if);
-
- return guestfs__config (g, "-drive", buf);
-}
-
-int
-guestfs__add_drive (guestfs_h *g, const char *filename)
-{
- return guestfs__add_drive_with_if (g, filename, DRIVE_IF);
-}
-
-int
-guestfs__add_drive_ro (guestfs_h *g, const char *filename)
-{
- return guestfs__add_drive_ro_with_if (g, filename, DRIVE_IF);
-}
-
-int
-guestfs__add_cdrom (guestfs_h *g, const char *filename)
-{
- if (strchr (filename, ',') != NULL) {
- error (g, _("filename cannot contain ',' (comma) character"));
- return -1;
- }
-
- if (access (filename, F_OK) == -1) {
- perrorf (g, "%s", filename);
- return -1;
- }
-
- return guestfs__config (g, "-cdrom", filename);
-}
-
-/* Returns true iff file is contained in dir. */
-static int
-dir_contains_file (const char *dir, const char *file)
+void
+guestfs_set_log_message_callback (guestfs_h *g,
+ guestfs_log_message_cb cb, void *opaque)
{
- int dirlen = strlen (dir);
- int filelen = strlen (file);
- int len = dirlen+filelen+2;
- char path[len];
-
- snprintf (path, len, "%s/%s", dir, file);
- return access (path, F_OK) == 0;
+ g->log_message_cb = cb;
+ g->log_message_cb_data = opaque;
}
-/* Returns true iff every listed file is contained in 'dir'. */
-static int
-dir_contains_files (const char *dir, ...)
+void
+guestfs_set_subprocess_quit_callback (guestfs_h *g,
+ guestfs_subprocess_quit_cb cb, void *opaque)
{
- va_list args;
- const char *file;
-
- va_start (args, dir);
- while ((file = va_arg (args, const char *)) != NULL) {
- if (!dir_contains_file (dir, file)) {
- va_end (args);
- return 0;
- }
- }
- va_end (args);
- return 1;
+ g->subprocess_quit_cb = cb;
+ g->subprocess_quit_cb_data = opaque;
}
-static void print_timestamped_message (guestfs_h *g, const char *fs, ...);
-static int build_supermin_appliance (guestfs_h *g, const char *path, char **kernel, char **initrd);
-static int is_openable (guestfs_h *g, const char *path, int flags);
-static void print_cmdline (guestfs_h *g);
-
-static const char *kernel_name = "vmlinuz." REPO "." host_cpu;
-static const char *initrd_name = "initramfs." REPO "." host_cpu ".img";
-
-int
-guestfs__launch (guestfs_h *g)
+void
+guestfs_set_launch_done_callback (guestfs_h *g,
+ guestfs_launch_done_cb cb, void *opaque)
{
- const char *tmpdir;
- char dir_template[PATH_MAX];
- int r, pmore;
- size_t len;
- int wfd[2], rfd[2];
- int tries;
- char *path, *pelem, *pend;
- char *kernel = NULL, *initrd = NULL;
- int null_vmchannel_sock;
- char unixsock[256];
- struct sockaddr_un addr;
-
- /* Configured? */
- if (!g->cmdline) {
- error (g, _("you must call guestfs_add_drive before guestfs_launch"));
- return -1;
- }
-
- if (g->state != CONFIG) {
- error (g, _("the libguestfs handle has already been launched"));
- return -1;
- }
-
- /* Start the clock ... */
- gettimeofday (&g->launch_t, NULL);
-
- /* Make the temporary directory. */
-#ifdef P_tmpdir
- tmpdir = P_tmpdir;
-#else
- tmpdir = "/tmp";
-#endif
-
- tmpdir = getenv ("TMPDIR") ? : tmpdir;
- snprintf (dir_template, sizeof dir_template, "%s/libguestfsXXXXXX", tmpdir);
-
- if (!g->tmpdir) {
- g->tmpdir = safe_strdup (g, dir_template);
- if (mkdtemp (g->tmpdir) == NULL) {
- perrorf (g, _("%s: cannot create temporary directory"), dir_template);
- goto cleanup0;
- }
- }
-
- /* Allow anyone to read the temporary directory. There are no
- * secrets in the kernel or initrd files. The socket in this
- * directory won't be readable but anyone can see it exists if they
- * want. (RHBZ#610880).
- */
- if (chmod (g->tmpdir, 0755) == -1)
- fprintf (stderr, "chmod: %s: %m (ignored)\n", g->tmpdir);
-
- /* First search g->path for the supermin appliance, and try to
- * synthesize a kernel and initrd from that. If it fails, we
- * try the path search again looking for a backup ordinary
- * appliance.
- */
- pelem = path = safe_strdup (g, g->path);
- do {
- pend = strchrnul (pelem, ':');
- pmore = *pend == ':';
- *pend = '\0';
- len = pend - pelem;
-
- /* Empty element of "." means cwd. */
- if (len == 0 || (len == 1 && *pelem == '.')) {
- if (g->verbose)
- fprintf (stderr,
- "looking for supermin appliance in current directory\n");
- if (dir_contains_files (".",
- "supermin.d", "kmod.whitelist", NULL)) {
- if (build_supermin_appliance (g, ".", &kernel, &initrd) == -1)
- return -1;
- break;
- }
- }
- /* Look at <path>/supermin* etc. */
- else {
- if (g->verbose)
- fprintf (stderr, "looking for supermin appliance in %s\n", pelem);
-
- if (dir_contains_files (pelem,
- "supermin.d", "kmod.whitelist", NULL)) {
- if (build_supermin_appliance (g, pelem, &kernel, &initrd) == -1)
- return -1;
- break;
- }
- }
-
- pelem = pend + 1;
- } while (pmore);
-
- free (path);
-
- if (kernel == NULL || initrd == NULL) {
- /* Search g->path for the kernel and initrd. */
- pelem = path = safe_strdup (g, g->path);
- do {
- pend = strchrnul (pelem, ':');
- pmore = *pend == ':';
- *pend = '\0';
- len = pend - pelem;
-
- /* Empty element or "." means cwd. */
- if (len == 0 || (len == 1 && *pelem == '.')) {
- if (g->verbose)
- fprintf (stderr,
- "looking for appliance in current directory\n");
- if (dir_contains_files (".", kernel_name, initrd_name, NULL)) {
- kernel = safe_strdup (g, kernel_name);
- initrd = safe_strdup (g, initrd_name);
- break;
- }
- }
- /* Look at <path>/kernel etc. */
- else {
- if (g->verbose)
- fprintf (stderr, "looking for appliance in %s\n", pelem);
-
- if (dir_contains_files (pelem, kernel_name, initrd_name, NULL)) {
- kernel = safe_malloc (g, len + strlen (kernel_name) + 2);
- initrd = safe_malloc (g, len + strlen (initrd_name) + 2);
- sprintf (kernel, "%s/%s", pelem, kernel_name);
- sprintf (initrd, "%s/%s", pelem, initrd_name);
- break;
- }
- }
-
- pelem = pend + 1;
- } while (pmore);
-
- free (path);
- }
-
- if (kernel == NULL || initrd == NULL) {
- error (g, _("cannot find %s or %s on LIBGUESTFS_PATH (current path = %s)"),
- kernel_name, initrd_name, g->path);
- goto cleanup0;
- }
-
- if (g->verbose)
- print_timestamped_message (g, "begin testing qemu features");
-
- /* Get qemu help text and version. */
- if (qemu_supports (g, NULL) == -1)
- goto cleanup0;
-
- /* Choose which vmchannel implementation to use. */
- if (CAN_CHECK_PEER_EUID && qemu_supports (g, "-net user")) {
- /* The "null vmchannel" implementation. Requires SLIRP (user mode
- * networking in qemu) but no other vmchannel support. The daemon
- * will connect back to a random port number on localhost.
- */
- struct sockaddr_in addr;
- socklen_t addrlen = sizeof addr;
-
- g->sock = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
- if (g->sock == -1) {
- perrorf (g, "socket");
- goto cleanup0;
- }
- addr.sin_family = AF_INET;
- addr.sin_port = htons (0);
- addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
- if (bind (g->sock, (struct sockaddr *) &addr, addrlen) == -1) {
- perrorf (g, "bind");
- goto cleanup0;
- }
-
- if (listen (g->sock, 256) == -1) {
- perrorf (g, "listen");
- goto cleanup0;
- }
-
- if (getsockname (g->sock, (struct sockaddr *) &addr, &addrlen) == -1) {
- perrorf (g, "getsockname");
- goto cleanup0;
- }
-
- if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
- perrorf (g, "fcntl");
- goto cleanup0;
- }
-
- null_vmchannel_sock = ntohs (addr.sin_port);
- if (g->verbose)
- fprintf (stderr, "null_vmchannel_sock = %d\n", null_vmchannel_sock);
- } else {
- /* Using some vmchannel impl. We need to create a local Unix
- * domain socket for qemu to use.
- */
- snprintf (unixsock, sizeof unixsock, "%s/sock", g->tmpdir);
- unlink (unixsock);
- null_vmchannel_sock = 0;
- }
-
- if (!g->direct) {
- if (pipe (wfd) == -1 || pipe (rfd) == -1) {
- perrorf (g, "pipe");
- goto cleanup0;
- }
- }
-
- if (g->verbose)
- print_timestamped_message (g, "finished testing qemu features");
-
- r = fork ();
- if (r == -1) {
- perrorf (g, "fork");
- if (!g->direct) {
- close (wfd[0]);
- close (wfd[1]);
- close (rfd[0]);
- close (rfd[1]);
- }
- goto cleanup0;
- }
-
- if (r == 0) { /* Child (qemu). */
- char buf[256];
- const char *vmchannel = NULL;
-
- /* Set up the full command line. Do this in the subprocess so we
- * don't need to worry about cleaning up.
- */
- g->cmdline[0] = g->qemu;
-
- /* qemu sometimes needs this option to enable hardware
- * virtualization, but some versions of 'qemu-kvm' will use KVM
- * regardless (even where this option appears in the help text).
- * It is rumoured that there are versions of qemu where supplying
- * this option when hardware virtualization is not available will
- * cause qemu to fail, so we we have to check at least that
- * /dev/kvm is openable. That's not reliable, since /dev/kvm
- * might be openable by qemu but not by us (think: SELinux) in
- * which case the user would not get hardware virtualization,
- * although at least shouldn't fail. A giant clusterfuck with the
- * qemu command line, again.
- */
- if (qemu_supports (g, "-enable-kvm") &&
- is_openable (g, "/dev/kvm", O_RDWR))
- add_cmdline (g, "-enable-kvm");
-
- /* Newer versions of qemu (from around 2009/12) changed the
- * behaviour of monitors so that an implicit '-monitor stdio' is
- * assumed if we are in -nographic mode and there is no other
- * -monitor option. Only a single stdio device is allowed, so
- * this broke the '-serial stdio' option. There is a new flag
- * called -nodefaults which gets rid of all this default crud, so
- * let's use that to avoid this and any future surprises.
- */
- if (qemu_supports (g, "-nodefaults"))
- add_cmdline (g, "-nodefaults");
-
- add_cmdline (g, "-nographic");
- add_cmdline (g, "-serial");
- add_cmdline (g, "stdio");
-
- snprintf (buf, sizeof buf, "%d", g->memsize);
- add_cmdline (g, "-m");
- add_cmdline (g, buf);
-
- /* Force exit instead of reboot on panic */
- add_cmdline (g, "-no-reboot");
-
- /* These options recommended by KVM developers to improve reliability. */
- if (qemu_supports (g, "-no-hpet"))
- add_cmdline (g, "-no-hpet");
-
- if (qemu_supports (g, "-rtc-td-hack"))
- add_cmdline (g, "-rtc-td-hack");
-
- /* If qemu has SLIRP (user mode network) enabled then we can get
- * away with "no vmchannel", where we just connect back to a random
- * host port.
- */
- if (null_vmchannel_sock) {
- add_cmdline (g, "-net");
- add_cmdline (g, "user,vlan=0,net=" NETWORK);
-
- snprintf (buf, sizeof buf,
- "guestfs_vmchannel=tcp:" ROUTER ":%d",
- null_vmchannel_sock);
- vmchannel = strdup (buf);
- }
-
- /* New-style -net user,guestfwd=... syntax for guestfwd. See:
- *
- * http://git.savannah.gnu.org/cgit/qemu.git/commit/?id=c92ef6a22d3c71538fcc48fb61ad353f7ba03b62
- *
- * The original suggested format doesn't work, see:
- *
- * http://lists.gnu.org/archive/html/qemu-devel/2009-07/msg01654.html
- *
- * However Gerd Hoffman privately suggested to me using -chardev
- * instead, which does work.
- */
- else if (qemu_supports (g, "-chardev") && qemu_supports (g, "guestfwd")) {
- snprintf (buf, sizeof buf,
- "socket,id=guestfsvmc,path=%s,server,nowait", unixsock);
-
- add_cmdline (g, "-chardev");
- add_cmdline (g, buf);
-
- snprintf (buf, sizeof buf,
- "user,vlan=0,net=" NETWORK ","
- "guestfwd=tcp:" GUESTFWD_ADDR ":" GUESTFWD_PORT
- "-chardev:guestfsvmc");
-
- add_cmdline (g, "-net");
- add_cmdline (g, buf);
-
- vmchannel = "guestfs_vmchannel=tcp:" GUESTFWD_ADDR ":" GUESTFWD_PORT;
- }
-
- /* Not guestfwd. HOPEFULLY this qemu uses the older -net channel
- * syntax, or if not then we'll get a quick failure.
- */
- else {
- snprintf (buf, sizeof buf,
- "channel," GUESTFWD_PORT ":unix:%s,server,nowait", unixsock);
-
- add_cmdline (g, "-net");
- add_cmdline (g, buf);
- add_cmdline (g, "-net");
- add_cmdline (g, "user,vlan=0,net=" NETWORK);
-
- vmchannel = "guestfs_vmchannel=tcp:" GUESTFWD_ADDR ":" GUESTFWD_PORT;
- }
- add_cmdline (g, "-net");
- add_cmdline (g, "nic,model=" NET_IF ",vlan=0");
-
-#define LINUX_CMDLINE \
- "panic=1 " /* force kernel to panic if daemon exits */ \
- "console=ttyS0 " /* serial console */ \
- "udevtimeout=300 " /* good for very slow systems (RHBZ#480319) */ \
- "noapic " /* workaround for RHBZ#502058 - ok if not SMP */ \
- "acpi=off " /* we don't need ACPI, turn it off */ \
- "printk.time=1 " /* display timestamp before kernel messages */ \
- "cgroup_disable=memory " /* saves us about 5 MB of RAM */
-
- /* Linux kernel command line. */
- snprintf (buf, sizeof buf,
- LINUX_CMDLINE
- "%s " /* (selinux) */
- "%s " /* (vmchannel) */
- "%s " /* (verbose) */
- "TERM=%s " /* (TERM environment variable) */
- "%s", /* (append) */
- g->selinux ? "selinux=1 enforcing=0" : "selinux=0",
- vmchannel ? vmchannel : "",
- g->verbose ? "guestfs_verbose=1" : "",
- getenv ("TERM") ? : "linux",
- g->append ? g->append : "");
-
- add_cmdline (g, "-kernel");
- add_cmdline (g, (char *) kernel);
- add_cmdline (g, "-initrd");
- add_cmdline (g, (char *) initrd);
- add_cmdline (g, "-append");
- add_cmdline (g, buf);
-
- /* Finish off the command line. */
- incr_cmdline_size (g);
- g->cmdline[g->cmdline_size-1] = NULL;
-
- if (g->verbose)
- print_cmdline (g);
-
- if (!g->direct) {
- /* Set up stdin, stdout. */
- close (0);
- close (1);
- close (wfd[1]);
- close (rfd[0]);
-
- if (dup (wfd[0]) == -1) {
- dup_failed:
- perror ("dup failed");
- _exit (EXIT_FAILURE);
- }
- if (dup (rfd[1]) == -1)
- goto dup_failed;
-
- close (wfd[0]);
- close (rfd[1]);
- }
-
-#if 0
- /* Set up a new process group, so we can signal this process
- * and all subprocesses (eg. if qemu is really a shell script).
- */
- setpgid (0, 0);
-#endif
-
- setenv ("LC_ALL", "C", 1);
-
- execv (g->qemu, g->cmdline); /* Run qemu. */
- perror (g->qemu);
- _exit (EXIT_FAILURE);
- }
-
- /* Parent (library). */
- g->pid = r;
-
- free (kernel);
- kernel = NULL;
- free (initrd);
- initrd = NULL;
-
- /* Fork the recovery process off which will kill qemu if the parent
- * process fails to do so (eg. if the parent segfaults).
- */
- g->recoverypid = -1;
- if (g->recovery_proc) {
- r = fork ();
- if (r == 0) {
- pid_t qemu_pid = g->pid;
- pid_t parent_pid = getppid ();
-
- /* Writing to argv is hideously complicated and error prone. See:
- * http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/ps_status.c?rev=1.33.2.1;content-type=text%2Fplain
- */
-
- /* Loop around waiting for one or both of the other processes to
- * disappear. It's fair to say this is very hairy. The PIDs that
- * we are looking at might be reused by another process. We are
- * effectively polling. Is the cure worse than the disease?
- */
- for (;;) {
- if (kill (qemu_pid, 0) == -1) /* qemu's gone away, we aren't needed */
- _exit (EXIT_SUCCESS);
- if (kill (parent_pid, 0) == -1) {
- /* Parent's gone away, qemu still around, so kill qemu. */
- kill (qemu_pid, 9);
- _exit (EXIT_SUCCESS);
- }
- sleep (2);
- }
- }
-
- /* Don't worry, if the fork failed, this will be -1. The recovery
- * process isn't essential.
- */
- g->recoverypid = r;
- }
-
- if (!g->direct) {
- /* Close the other ends of the pipe. */
- close (wfd[0]);
- close (rfd[1]);
-
- if (fcntl (wfd[1], F_SETFL, O_NONBLOCK) == -1 ||
- fcntl (rfd[0], F_SETFL, O_NONBLOCK) == -1) {
- perrorf (g, "fcntl");
- goto cleanup1;
- }
-
- g->fd[0] = wfd[1]; /* stdin of child */
- g->fd[1] = rfd[0]; /* stdout of child */
- } else {
- g->fd[0] = open ("/dev/null", O_RDWR);
- if (g->fd[0] == -1) {
- perrorf (g, "open /dev/null");
- goto cleanup1;
- }
- g->fd[1] = dup (g->fd[0]);
- if (g->fd[1] == -1) {
- perrorf (g, "dup");
- close (g->fd[0]);
- goto cleanup1;
- }
- }
-
- if (null_vmchannel_sock) {
- int sock = -1;
- uid_t uid;
-
- /* Null vmchannel implementation: We listen on g->sock for a
- * connection. The connection could come from any local process
- * so we must check it comes from the appliance (or at least
- * from our UID) for security reasons.
- */
- while (sock == -1) {
- sock = accept_from_daemon (g);
- if (sock == -1)
- goto cleanup1;
-
- if (check_peer_euid (g, sock, &uid) == -1)
- goto cleanup1;
- if (uid != geteuid ()) {
- fprintf (stderr,
- "libguestfs: warning: unexpected connection from UID %d to port %d\n",
- uid, null_vmchannel_sock);
- close (sock);
- sock = -1;
- continue;
- }
- }
-
- if (fcntl (sock, F_SETFL, O_NONBLOCK) == -1) {
- perrorf (g, "fcntl");
- goto cleanup1;
- }
-
- close (g->sock);
- g->sock = sock;
- } else {
- /* Other vmchannel. Open the Unix socket.
- *
- * The vmchannel implementation that got merged with qemu sucks in
- * a number of ways. Both ends do connect(2), which means that no
- * one knows what, if anything, is connected to the other end, or
- * if it becomes disconnected. Even worse, we have to wait some
- * indeterminate time for qemu to create the socket and connect to
- * it (which happens very early in qemu's start-up), so any code
- * that uses vmchannel is inherently racy. Hence this silly loop.
- */
- g->sock = socket (AF_UNIX, SOCK_STREAM, 0);
- if (g->sock == -1) {
- perrorf (g, "socket");
- goto cleanup1;
- }
-
- if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
- perrorf (g, "fcntl");
- goto cleanup1;
- }
-
- addr.sun_family = AF_UNIX;
- strncpy (addr.sun_path, unixsock, UNIX_PATH_MAX);
- addr.sun_path[UNIX_PATH_MAX-1] = '\0';
-
- tries = 100;
- /* Always sleep at least once to give qemu a small chance to start up. */
- usleep (10000);
- while (tries > 0) {
- r = connect (g->sock, (struct sockaddr *) &addr, sizeof addr);
- if ((r == -1 && errno == EINPROGRESS) || r == 0)
- goto connected;
-
- if (errno != ENOENT)
- perrorf (g, "connect");
- tries--;
- usleep (100000);
- }
-
- error (g, _("failed to connect to vmchannel socket"));
- goto cleanup1;
-
- connected: ;
- }
-
- g->state = LAUNCHING;
-
- /* Wait for qemu to start and to connect back to us via vmchannel and
- * send the GUESTFS_LAUNCH_FLAG message.
- */
- uint32_t size;
- void *buf = NULL;
- r = recv_from_daemon (g, &size, &buf);
- free (buf);
-
- if (r == -1) return -1;
-
- if (size != GUESTFS_LAUNCH_FLAG) {
- error (g, _("guestfs_launch failed, see earlier error messages"));
- goto cleanup1;
- }
-
- if (g->verbose)
- print_timestamped_message (g, "appliance is up");
-
- /* This is possible in some really strange situations, such as
- * guestfsd starts up OK but then qemu immediately exits. Check for
- * it because the caller is probably expecting to be able to send
- * commands after this function returns.
- */
- if (g->state != READY) {
- error (g, _("qemu launched and contacted daemon, but state != READY"));
- goto cleanup1;
- }
-
- return 0;
-
- cleanup1:
- if (!g->direct) {
- close (wfd[1]);
- close (rfd[0]);
- }
- if (g->pid > 0) kill (g->pid, 9);
- if (g->recoverypid > 0) kill (g->recoverypid, 9);
- waitpid (g->pid, NULL, 0);
- if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
- g->fd[0] = -1;
- g->fd[1] = -1;
- g->pid = 0;
- g->recoverypid = 0;
- memset (&g->launch_t, 0, sizeof g->launch_t);
-
- cleanup0:
- if (g->sock >= 0) {
- close (g->sock);
- g->sock = -1;
- }
- g->state = CONFIG;
- free (kernel);
- free (initrd);
- return -1;
+ g->launch_done_cb = cb;
+ g->launch_done_cb_data = opaque;
}
-/* This function is used to print the qemu command line before it gets
- * executed, when in verbose mode.
- */
-static void
-print_cmdline (guestfs_h *g)
-{
- int i = 0;
- int needs_quote;
-
- while (g->cmdline[i]) {
- if (g->cmdline[i][0] == '-') /* -option starts a new line */
- fprintf (stderr, " \\\n ");
-
- if (i > 0) fputc (' ', stderr);
-
- /* Does it need shell quoting? This only deals with simple cases. */
- needs_quote = strcspn (g->cmdline[i], " ") != strlen (g->cmdline[i]);
-
- if (needs_quote) fputc ('\'', stderr);
- fprintf (stderr, "%s", g->cmdline[i]);
- if (needs_quote) fputc ('\'', stderr);
- i++;
- }
-
- fputc ('\n', stderr);
-}
-
-/* This function does the hard work of building the supermin appliance
- * on the fly. 'path' is the directory containing the control files.
- * 'kernel' and 'initrd' are where we will return the names of the
- * kernel and initrd (only initrd is built). The work is done by
- * an external script. We just tell it where to put the result.
- */
-static int
-build_supermin_appliance (guestfs_h *g, const char *path,
- char **kernel, char **initrd)
-{
- char cmd[4096];
- int r, len;
-
- if (g->verbose)
- print_timestamped_message (g, "begin building supermin appliance");
-
- len = strlen (g->tmpdir);
- *kernel = safe_malloc (g, len + 8);
- snprintf (*kernel, len+8, "%s/kernel", g->tmpdir);
- *initrd = safe_malloc (g, len + 8);
- snprintf (*initrd, len+8, "%s/initrd", g->tmpdir);
-
- /* Set a sensible umask in the subprocess, so kernel and initrd
- * output files are world-readable (RHBZ#610880).
- */
- snprintf (cmd, sizeof cmd,
- "umask 0002; "
- "febootstrap-supermin-helper%s "
- "-k '%s/kmod.whitelist' "
- "'%s/supermin.d' "
- host_cpu " "
- "%s %s",
- g->verbose ? " --verbose" : "",
- path,
- path,
- *kernel, *initrd);
- if (g->verbose)
- print_timestamped_message (g, "%s", cmd);
-
- r = system (cmd);
- if (r == -1 || WEXITSTATUS(r) != 0) {
- error (g, _("external command failed: %s"), cmd);
- free (*kernel);
- free (*initrd);
- *kernel = *initrd = NULL;
- return -1;
- }
-
- if (g->verbose)
- print_timestamped_message (g, "finished building supermin appliance");
-
- return 0;
-}
-
-/* Compute Y - X and return the result in milliseconds.
- * Approximately the same as this code:
- * http://www.mpp.mpg.de/~huber/util/timevaldiff.c
- */
-static int64_t
-timeval_diff (const struct timeval *x, const struct timeval *y)
-{
- int64_t msec;
-
- msec = (y->tv_sec - x->tv_sec) * 1000;
- msec += (y->tv_usec - x->tv_usec) / 1000;
- return msec;
-}
-
-static void
-print_timestamped_message (guestfs_h *g, const char *fs, ...)
-{
- va_list args;
- char *msg;
- int err;
- struct timeval tv;
-
- va_start (args, fs);
- err = vasprintf (&msg, fs, args);
- va_end (args);
-
- if (err < 0) return;
-
- gettimeofday (&tv, NULL);
-
- fprintf (stderr, "[%05" PRIi64 "ms] %s\n",
- timeval_diff (&g->launch_t, &tv), msg);
-
- free (msg);
-}
-
-static int read_all (guestfs_h *g, FILE *fp, char **ret);
-
-/* Test qemu binary (or wrapper) runs, and do 'qemu -help' and
- * 'qemu -version' so we know what options this qemu supports and
- * the version.
- */
-static int
-test_qemu (guestfs_h *g)
-{
- char cmd[1024];
- FILE *fp;
-
- snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -nographic -help", g->qemu);
-
- fp = popen (cmd, "r");
- /* qemu -help should always work (qemu -version OTOH wasn't
- * supported by qemu 0.9). If this command doesn't work then it
- * probably indicates that the qemu binary is missing.
- */
- if (!fp) {
- /* XXX This error is never printed, even if the qemu binary
- * doesn't exist. Why?
- */
- error:
- perrorf (g, _("%s: command failed: If qemu is located on a non-standard path, try setting the LIBGUESTFS_QEMU environment variable."), cmd);
- return -1;
- }
-
- if (read_all (g, fp, &g->qemu_help) == -1)
- goto error;
-
- if (pclose (fp) == -1)
- goto error;
-
- snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -nographic -version 2>/dev/null",
- g->qemu);
-
- fp = popen (cmd, "r");
- if (fp) {
- /* Intentionally ignore errors. */
- read_all (g, fp, &g->qemu_version);
- pclose (fp);
- }
-
- return 0;
-}
-
-static int
-read_all (guestfs_h *g, FILE *fp, char **ret)
-{
- int r, n = 0;
- char *p;
-
- again:
- if (feof (fp)) {
- *ret = safe_realloc (g, *ret, n + 1);
- (*ret)[n] = '\0';
- return n;
- }
-
- *ret = safe_realloc (g, *ret, n + BUFSIZ);
- p = &(*ret)[n];
- r = fread (p, 1, BUFSIZ, fp);
- if (ferror (fp)) {
- perrorf (g, "read");
- return -1;
- }
- n += r;
- goto again;
-}
-
-/* Test if option is supported by qemu command line (just by grepping
- * the help text).
- *
- * The first time this is used, it has to run the external qemu
- * binary. If that fails, it returns -1.
- *
- * To just do the first-time run of the qemu binary, call this with
- * option == NULL, in which case it will return -1 if there was an
- * error doing that.
- */
-static int
-qemu_supports (guestfs_h *g, const char *option)
-{
- if (!g->qemu_help) {
- if (test_qemu (g) == -1)
- return -1;
- }
-
- if (option == NULL)
- return 1;
-
- return strstr (g->qemu_help, option) != NULL;
-}
-
-/* Check if a file can be opened. */
-static int
-is_openable (guestfs_h *g, const char *path, int flags)
-{
- int fd = open (path, flags);
- if (fd == -1) {
- if (g->verbose)
- perror (path);
- return 0;
- }
- close (fd);
- return 1;
-}
-
-/* Check the peer effective UID for a TCP socket. Ideally we'd like
- * SO_PEERCRED for a loopback TCP socket. This isn't possible on
- * Linux (but it is on Solaris!) so we read /proc/net/tcp instead.
- */
-static int
-check_peer_euid (guestfs_h *g, int sock, uid_t *rtn)
-{
-#if CAN_CHECK_PEER_EUID
- struct sockaddr_in peer;
- socklen_t addrlen = sizeof peer;
-
- if (getpeername (sock, (struct sockaddr *) &peer, &addrlen) == -1) {
- perrorf (g, "getpeername");
- return -1;
- }
-
- if (peer.sin_family != AF_INET ||
- ntohl (peer.sin_addr.s_addr) != INADDR_LOOPBACK) {
- error (g, "check_peer_euid: unexpected connection from non-IPv4, non-loopback peer (family = %d, addr = %s)",
- peer.sin_family, inet_ntoa (peer.sin_addr));
- return -1;
- }
-
- struct sockaddr_in our;
- addrlen = sizeof our;
- if (getsockname (sock, (struct sockaddr *) &our, &addrlen) == -1) {
- perrorf (g, "getsockname");
- return -1;
- }
-
- FILE *fp = fopen ("/proc/net/tcp", "r");
- if (fp == NULL) {
- perrorf (g, "/proc/net/tcp");
- return -1;
- }
-
- char line[256];
- if (fgets (line, sizeof line, fp) == NULL) { /* Drop first line. */
- error (g, "unexpected end of file in /proc/net/tcp");
- fclose (fp);
- return -1;
- }
-
- while (fgets (line, sizeof line, fp) != NULL) {
- unsigned line_our_addr, line_our_port, line_peer_addr, line_peer_port;
- int dummy0, dummy1, dummy2, dummy3, dummy4, dummy5, dummy6;
- int line_uid;
-
- if (sscanf (line, "%d:%08X:%04X %08X:%04X %02X %08X:%08X %02X:%08X %08X %d",
- &dummy0,
- &line_our_addr, &line_our_port,
- &line_peer_addr, &line_peer_port,
- &dummy1, &dummy2, &dummy3, &dummy4, &dummy5, &dummy6,
- &line_uid) == 12) {
- /* Note about /proc/net/tcp: local_address and rem_address are
- * always in network byte order. However the port part is
- * always in host byte order.
- *
- * The sockname and peername that we got above are in network
- * byte order. So we have to byte swap the port but not the
- * address part.
- */
- if (line_our_addr == our.sin_addr.s_addr &&
- line_our_port == ntohs (our.sin_port) &&
- line_peer_addr == peer.sin_addr.s_addr &&
- line_peer_port == ntohs (peer.sin_port)) {
- *rtn = line_uid;
- fclose (fp);
- return 0;
- }
- }
- }
-
- error (g, "check_peer_euid: no matching TCP connection found in /proc/net/tcp");
- fclose (fp);
- return -1;
-#else /* !CAN_CHECK_PEER_EUID */
- /* This function exists but should never be called in this
- * configuration.
- */
- abort ();
-#endif /* !CAN_CHECK_PEER_EUID */
-}
-
-/* You had to call this function after launch in versions <= 1.0.70,
- * but it is now a no-op.
- */
-int
-guestfs__wait_ready (guestfs_h *g)
-{
- if (g->state != READY) {
- error (g, _("qemu has not been launched yet"));
- return -1;
- }
-
- return 0;
-}
-
-int
-guestfs__kill_subprocess (guestfs_h *g)
-{
- if (g->state == CONFIG) {
- error (g, _("no subprocess to kill"));
- return -1;
- }
-
- if (g->verbose)
- fprintf (stderr, "sending SIGTERM to process %d\n", g->pid);
-
- if (g->pid > 0) kill (g->pid, SIGTERM);
- if (g->recoverypid > 0) kill (g->recoverypid, 9);
-
- return 0;
-}
-
-/* Access current state. */
-int
-guestfs__is_config (guestfs_h *g)
-{
- return g->state == CONFIG;
-}
-
-int
-guestfs__is_launching (guestfs_h *g)
-{
- return g->state == LAUNCHING;
-}
-
-int
-guestfs__is_ready (guestfs_h *g)
-{
- return g->state == READY;
-}
-
-int
-guestfs__is_busy (guestfs_h *g)
-{
- return g->state == BUSY;
-}
-
-int
-guestfs__get_state (guestfs_h *g)
-{
- return g->state;
-}
-
-void
-guestfs_set_log_message_callback (guestfs_h *g,
- guestfs_log_message_cb cb, void *opaque)
-{
- g->log_message_cb = cb;
- g->log_message_cb_data = opaque;
-}
-
-void
-guestfs_set_subprocess_quit_callback (guestfs_h *g,
- guestfs_subprocess_quit_cb cb, void *opaque)
-{
- g->subprocess_quit_cb = cb;
- g->subprocess_quit_cb_data = opaque;
-}
-
-void
-guestfs_set_launch_done_callback (guestfs_h *g,
- guestfs_launch_done_cb cb, void *opaque)
-{
- g->launch_done_cb = cb;
- g->launch_done_cb_data = opaque;
-}
-
-void
-guestfs_set_close_callback (guestfs_h *g,
- guestfs_close_cb cb, void *opaque)
+void
+guestfs_set_close_callback (guestfs_h *g,
+ guestfs_close_cb cb, void *opaque)
{
g->close_cb = cb;
g->close_cb_data = opaque;
}
-
-/*----------------------------------------------------------------------*/
-
-/* This is the code used to send and receive RPC messages and (for
- * certain types of message) to perform file transfers. This code is
- * driven from the generated actions (src/actions.c). There
- * are five different cases to consider:
- *
- * (1) A non-daemon function. There is no RPC involved at all, it's
- * all handled inside the library.
- *
- * (2) A simple RPC (eg. "mount"). We write the request, then read
- * the reply. The sequence of calls is:
- *
- * guestfs___set_busy
- * guestfs___send
- * guestfs___recv
- * guestfs___end_busy
- *
- * (3) An RPC with FileOut parameters (eg. "upload"). We write the
- * request, then write the file(s), then read the reply. The sequence
- * of calls is:
- *
- * guestfs___set_busy
- * guestfs___send
- * guestfs___send_file (possibly multiple times)
- * guestfs___recv
- * guestfs___end_busy
- *
- * (4) An RPC with FileIn parameters (eg. "download"). We write the
- * request, then read the reply, then read the file(s). The sequence
- * of calls is:
- *
- * guestfs___set_busy
- * guestfs___send
- * guestfs___recv
- * guestfs___recv_file (possibly multiple times)
- * guestfs___end_busy
- *
- * (5) Both FileOut and FileIn parameters. There are no calls like
- * this in the current API, but they would be implemented as a
- * combination of cases (3) and (4).
- *
- * During all writes and reads, we also select(2) on qemu stdout
- * looking for messages (guestfsd stderr and guest kernel dmesg), and
- * anything received is passed up through the log_message_cb. This is
- * also the reason why all the sockets are non-blocking. We also have
- * to check for EOF (qemu died). All of this is handled by the
- * functions send_to_daemon and recv_from_daemon.
- */
-
-int
-guestfs___set_busy (guestfs_h *g)
-{
- if (g->state != READY) {
- error (g, _("guestfs_set_busy: called when in state %d != READY"),
- g->state);
- return -1;
- }
- g->state = BUSY;
- return 0;
-}
-
-int
-guestfs___end_busy (guestfs_h *g)
-{
- switch (g->state)
- {
- case BUSY:
- g->state = READY;
- break;
- case CONFIG:
- case READY:
- break;
-
- case LAUNCHING:
- case NO_HANDLE:
- default:
- error (g, _("guestfs_end_busy: called when in state %d"), g->state);
- return -1;
- }
- return 0;
-}
-
-/* This is called if we detect EOF, ie. qemu died. */
-static void
-child_cleanup (guestfs_h *g)
-{
- if (g->verbose)
- fprintf (stderr, "child_cleanup: %p: child process died\n", g);
-
- /*if (g->pid > 0) kill (g->pid, SIGTERM);*/
- if (g->recoverypid > 0) kill (g->recoverypid, 9);
- waitpid (g->pid, NULL, 0);
- if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
- close (g->fd[0]);
- close (g->fd[1]);
- close (g->sock);
- g->fd[0] = -1;
- g->fd[1] = -1;
- g->sock = -1;
- g->pid = 0;
- g->recoverypid = 0;
- memset (&g->launch_t, 0, sizeof g->launch_t);
- g->state = CONFIG;
- if (g->subprocess_quit_cb)
- g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
-}
-
-static int
-read_log_message_or_eof (guestfs_h *g, int fd, int error_if_eof)
-{
- char buf[BUFSIZ];
- int n;
-
-#if 0
- if (g->verbose)
- fprintf (stderr,
- "read_log_message_or_eof: %p g->state = %d, fd = %d\n",
- g, g->state, fd);
-#endif
-
- /* QEMU's console emulates a 16550A serial port. The real 16550A
- * device has a small FIFO buffer (16 bytes) which means here we see
- * lots of small reads of 1-16 bytes in length, usually single
- * bytes.
- */
- n = read (fd, buf, sizeof buf);
- if (n == 0) {
- /* Hopefully this indicates the qemu child process has died. */
- child_cleanup (g);
-
- if (error_if_eof) {
- /* We weren't expecting eof here (called from launch) so place
- * something in the error buffer. RHBZ#588851.
- */
- error (g, "child process died unexpectedly");
- }
- return -1;
- }
-
- if (n == -1) {
- if (errno == EINTR || errno == EAGAIN)
- return 0;
-
- perrorf (g, "read");
- return -1;
- }
-
- /* In verbose mode, copy all log messages to stderr. */
- if (g->verbose)
- ignore_value (write (STDERR_FILENO, buf, n));
-
- /* It's an actual log message, send it upwards if anyone is listening. */
- if (g->log_message_cb)
- g->log_message_cb (g, g->log_message_cb_data, buf, n);
-
- return 0;
-}
-
-static int
-check_for_daemon_cancellation_or_eof (guestfs_h *g, int fd)
-{
- char buf[4];
- int n;
- uint32_t flag;
- XDR xdr;
-
- if (g->verbose)
- fprintf (stderr,
- "check_for_daemon_cancellation_or_eof: %p g->state = %d, fd = %d\n",
- g, g->state, fd);
-
- n = read (fd, buf, 4);
- if (n == 0) {
- /* Hopefully this indicates the qemu child process has died. */
- child_cleanup (g);
- return -1;
- }
-
- if (n == -1) {
- if (errno == EINTR || errno == EAGAIN)
- return 0;
-
- perrorf (g, "read");
- return -1;
- }
-
- xdrmem_create (&xdr, buf, 4, XDR_DECODE);
- xdr_uint32_t (&xdr, &flag);
- xdr_destroy (&xdr);
-
- if (flag != GUESTFS_CANCEL_FLAG) {
- error (g, _("check_for_daemon_cancellation_or_eof: read 0x%x from daemon, expected 0x%x\n"),
- flag, GUESTFS_CANCEL_FLAG);
- return -1;
- }
-
- return -2;
-}
-
-/* This writes the whole N bytes of BUF to the daemon socket.
- *
- * If the whole write is successful, it returns 0.
- * If there was an error, it returns -1.
- * If the daemon sent a cancellation message, it returns -2.
- *
- * It also checks qemu stdout for log messages and passes those up
- * through log_message_cb.
- *
- * It also checks for EOF (qemu died) and passes that up through the
- * child_cleanup function above.
- */
-static int
-send_to_daemon (guestfs_h *g, const void *v_buf, size_t n)
-{
- const char *buf = v_buf;
- fd_set rset, rset2;
- fd_set wset, wset2;
-
- if (g->verbose)
- fprintf (stderr,
- "send_to_daemon: %p g->state = %d, n = %zu\n", g, g->state, n);
-
- FD_ZERO (&rset);
- FD_ZERO (&wset);
-
- FD_SET (g->fd[1], &rset); /* Read qemu stdout for log messages & EOF. */
- FD_SET (g->sock, &rset); /* Read socket for cancellation & EOF. */
- FD_SET (g->sock, &wset); /* Write to socket to send the data. */
-
- int max_fd = MAX (g->sock, g->fd[1]);
-
- while (n > 0) {
- rset2 = rset;
- wset2 = wset;
- int r = select (max_fd+1, &rset2, &wset2, NULL, NULL);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "select");
- return -1;
- }
-
- if (FD_ISSET (g->fd[1], &rset2)) {
- if (read_log_message_or_eof (g, g->fd[1], 0) == -1)
- return -1;
- }
- if (FD_ISSET (g->sock, &rset2)) {
- r = check_for_daemon_cancellation_or_eof (g, g->sock);
- if (r < 0)
- return r;
- }
- if (FD_ISSET (g->sock, &wset2)) {
- r = write (g->sock, buf, n);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "write");
- if (errno == EPIPE) /* Disconnected from guest (RHBZ#508713). */
- child_cleanup (g);
- return -1;
- }
- buf += r;
- n -= r;
- }
- }
-
- return 0;
-}
-
-/* This reads a single message, file chunk, launch flag or
- * cancellation flag from the daemon. If something was read, it
- * returns 0, otherwise -1.
- *
- * Both size_rtn and buf_rtn must be passed by the caller as non-NULL.
- *
- * *size_rtn returns the size of the returned message or it may be
- * GUESTFS_LAUNCH_FLAG or GUESTFS_CANCEL_FLAG.
- *
- * *buf_rtn is returned containing the message (if any) or will be set
- * to NULL. *buf_rtn must be freed by the caller.
- *
- * It also checks qemu stdout for log messages and passes those up
- * through log_message_cb.
- *
- * It also checks for EOF (qemu died) and passes that up through the
- * child_cleanup function above.
- */
-static int
-recv_from_daemon (guestfs_h *g, uint32_t *size_rtn, void **buf_rtn)
-{
- fd_set rset, rset2;
-
- if (g->verbose)
- fprintf (stderr,
- "recv_from_daemon: %p g->state = %d, size_rtn = %p, buf_rtn = %p\n",
- g, g->state, size_rtn, buf_rtn);
-
- FD_ZERO (&rset);
-
- FD_SET (g->fd[1], &rset); /* Read qemu stdout for log messages & EOF. */
- FD_SET (g->sock, &rset); /* Read socket for data & EOF. */
-
- int max_fd = MAX (g->sock, g->fd[1]);
-
- *size_rtn = 0;
- *buf_rtn = NULL;
-
- char lenbuf[4];
- /* nr is the size of the message, but we prime it as -4 because we
- * have to read the message length word first.
- */
- ssize_t nr = -4;
-
- while (nr < (ssize_t) *size_rtn) {
- rset2 = rset;
- int r = select (max_fd+1, &rset2, NULL, NULL, NULL);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "select");
- free (*buf_rtn);
- *buf_rtn = NULL;
- return -1;
- }
-
- if (FD_ISSET (g->fd[1], &rset2)) {
- if (read_log_message_or_eof (g, g->fd[1], 0) == -1) {
- free (*buf_rtn);
- *buf_rtn = NULL;
- return -1;
- }
- }
- if (FD_ISSET (g->sock, &rset2)) {
- if (nr < 0) { /* Have we read the message length word yet? */
- r = read (g->sock, lenbuf+nr+4, -nr);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- int err = errno;
- perrorf (g, "read");
- /* Under some circumstances we see "Connection reset by peer"
- * here when the child dies suddenly. Catch this and call
- * the cleanup function, same as for EOF.
- */
- if (err == ECONNRESET)
- child_cleanup (g);
- return -1;
- }
- if (r == 0) {
- error (g, _("unexpected end of file when reading from daemon"));
- child_cleanup (g);
- return -1;
- }
- nr += r;
-
- if (nr < 0) /* Still not got the whole length word. */
- continue;
-
- XDR xdr;
- xdrmem_create (&xdr, lenbuf, 4, XDR_DECODE);
- xdr_uint32_t (&xdr, size_rtn);
- xdr_destroy (&xdr);
-
- if (*size_rtn == GUESTFS_LAUNCH_FLAG) {
- if (g->state != LAUNCHING)
- error (g, _("received magic signature from guestfsd, but in state %d"),
- g->state);
- else {
- g->state = READY;
- if (g->launch_done_cb)
- g->launch_done_cb (g, g->launch_done_cb_data);
- }
- return 0;
- }
- else if (*size_rtn == GUESTFS_CANCEL_FLAG)
- return 0;
- /* If this happens, it's pretty bad and we've probably lost
- * synchronization.
- */
- else if (*size_rtn > GUESTFS_MESSAGE_MAX) {
- error (g, _("message length (%u) > maximum possible size (%d)"),
- (unsigned) *size_rtn, GUESTFS_MESSAGE_MAX);
- return -1;
- }
-
- /* Allocate the complete buffer, size now known. */
- *buf_rtn = safe_malloc (g, *size_rtn);
- /*FALLTHROUGH*/
- }
-
- size_t sizetoread = *size_rtn - nr;
- if (sizetoread > BUFSIZ) sizetoread = BUFSIZ;
-
- r = read (g->sock, (char *) (*buf_rtn) + nr, sizetoread);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "read");
- free (*buf_rtn);
- *buf_rtn = NULL;
- return -1;
- }
- if (r == 0) {
- error (g, _("unexpected end of file when reading from daemon"));
- child_cleanup (g);
- free (*buf_rtn);
- *buf_rtn = NULL;
- return -1;
- }
- nr += r;
- }
- }
-
- /* Got the full message, caller can start processing it. */
-#ifdef ENABLE_PACKET_DUMP
- if (g->verbose) {
- ssize_t i, j;
-
- for (i = 0; i < nr; i += 16) {
- printf ("%04zx: ", i);
- for (j = i; j < MIN (i+16, nr); ++j)
- printf ("%02x ", (*(unsigned char **)buf_rtn)[j]);
- for (; j < i+16; ++j)
- printf (" ");
- printf ("|");
- for (j = i; j < MIN (i+16, nr); ++j)
- if (c_isprint ((*(char **)buf_rtn)[j]))
- printf ("%c", (*(char **)buf_rtn)[j]);
- else
- printf (".");
- for (; j < i+16; ++j)
- printf (" ");
- printf ("|\n");
- }
- }
-#endif
-
- return 0;
-}
-
-/* This is very much like recv_from_daemon above, but g->sock is
- * a listening socket and we are accepting a new connection on
- * that socket instead of reading anything. Returns the newly
- * accepted socket.
- */
-static int
-accept_from_daemon (guestfs_h *g)
-{
- fd_set rset, rset2;
-
- if (g->verbose)
- fprintf (stderr,
- "accept_from_daemon: %p g->state = %d\n", g, g->state);
-
- FD_ZERO (&rset);
-
- FD_SET (g->fd[1], &rset); /* Read qemu stdout for log messages & EOF. */
- FD_SET (g->sock, &rset); /* Read socket for accept. */
-
- int max_fd = MAX (g->sock, g->fd[1]);
- int sock = -1;
-
- while (sock == -1) {
- /* If the qemu process has died, clean up the zombie (RHBZ#579155).
- * By partially polling in the select below we ensure that this
- * function will be called eventually.
- */
- waitpid (g->pid, NULL, WNOHANG);
-
- rset2 = rset;
-
- struct timeval tv = { .tv_sec = 1, .tv_usec = 0 };
- int r = select (max_fd+1, &rset2, NULL, NULL, &tv);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "select");
- return -1;
- }
-
- if (FD_ISSET (g->fd[1], &rset2)) {
- if (read_log_message_or_eof (g, g->fd[1], 1) == -1)
- return -1;
- }
- if (FD_ISSET (g->sock, &rset2)) {
- sock = accept (g->sock, NULL, NULL);
- if (sock == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "accept");
- return -1;
- }
- }
- }
-
- return sock;
-}
-
-int
-guestfs___send (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
-{
- struct guestfs_message_header hdr;
- XDR xdr;
- u_int32_t len;
- int serial = g->msg_next_serial++;
- int r;
- char *msg_out;
- size_t msg_out_size;
-
- if (g->state != BUSY) {
- error (g, _("guestfs___send: state %d != BUSY"), g->state);
- return -1;
- }
-
- /* We have to allocate this message buffer on the heap because
- * it is quite large (although will be mostly unused). We
- * can't allocate it on the stack because in some environments
- * we have quite limited stack space available, notably when
- * running in the JVM.
- */
- msg_out = safe_malloc (g, GUESTFS_MESSAGE_MAX + 4);
- xdrmem_create (&xdr, msg_out + 4, GUESTFS_MESSAGE_MAX, XDR_ENCODE);
-
- /* Serialize the header. */
- hdr.prog = GUESTFS_PROGRAM;
- hdr.vers = GUESTFS_PROTOCOL_VERSION;
- hdr.proc = proc_nr;
- hdr.direction = GUESTFS_DIRECTION_CALL;
- hdr.serial = serial;
- hdr.status = GUESTFS_STATUS_OK;
-
- if (!xdr_guestfs_message_header (&xdr, &hdr)) {
- error (g, _("xdr_guestfs_message_header failed"));
- goto cleanup1;
- }
-
- /* Serialize the args. If any, because some message types
- * have no parameters.
- */
- if (xdrp) {
- if (!(*xdrp) (&xdr, args)) {
- error (g, _("dispatch failed to marshal args"));
- goto cleanup1;
- }
- }
-
- /* Get the actual length of the message, resize the buffer to match
- * the actual length, and write the length word at the beginning.
- */
- len = xdr_getpos (&xdr);
- xdr_destroy (&xdr);
-
- msg_out = safe_realloc (g, msg_out, len + 4);
- msg_out_size = len + 4;
-
- xdrmem_create (&xdr, msg_out, 4, XDR_ENCODE);
- xdr_uint32_t (&xdr, &len);
-
- again:
- r = send_to_daemon (g, msg_out, msg_out_size);
- if (r == -2) /* Ignore stray daemon cancellations. */
- goto again;
- if (r == -1)
- goto cleanup1;
- free (msg_out);
-
- return serial;
-
- cleanup1:
- free (msg_out);
- return -1;
-}
-
-static int cancel = 0; /* XXX Implement file cancellation. */
-static int send_file_chunk (guestfs_h *g, int cancel, const char *buf, size_t len);
-static int send_file_data (guestfs_h *g, const char *buf, size_t len);
-static int send_file_cancellation (guestfs_h *g);
-static int send_file_complete (guestfs_h *g);
-
-/* Send a file.
- * Returns:
- * 0 OK
- * -1 error
- * -2 daemon cancelled (we must read the error message)
- */
-int
-guestfs___send_file (guestfs_h *g, const char *filename)
-{
- char buf[GUESTFS_MAX_CHUNK_SIZE];
- int fd, r, err;
-
- fd = open (filename, O_RDONLY);
- if (fd == -1) {
- perrorf (g, "open: %s", filename);
- send_file_cancellation (g);
- /* Daemon sees cancellation and won't reply, so caller can
- * just return here.
- */
- return -1;
- }
-
- /* Send file in chunked encoding. */
- while (!cancel) {
- r = read (fd, buf, sizeof buf);
- if (r == -1 && (errno == EINTR || errno == EAGAIN))
- continue;
- if (r <= 0) break;
- err = send_file_data (g, buf, r);
- if (err < 0) {
- if (err == -2) /* daemon sent cancellation */
- send_file_cancellation (g);
- return err;
- }
- }
-
- if (cancel) { /* cancel from either end */
- send_file_cancellation (g);
- return -1;
- }
-
- if (r == -1) {
- perrorf (g, "read: %s", filename);
- send_file_cancellation (g);
- return -1;
- }
-
- /* End of file, but before we send that, we need to close
- * the file and check for errors.
- */
- if (close (fd) == -1) {
- perrorf (g, "close: %s", filename);
- send_file_cancellation (g);
- return -1;
- }
-
- return send_file_complete (g);
-}
-
-/* Send a chunk of file data. */
-static int
-send_file_data (guestfs_h *g, const char *buf, size_t len)
-{
- return send_file_chunk (g, 0, buf, len);
-}
-
-/* Send a cancellation message. */
-static int
-send_file_cancellation (guestfs_h *g)
-{
- return send_file_chunk (g, 1, NULL, 0);
-}
-
-/* Send a file complete chunk. */
-static int
-send_file_complete (guestfs_h *g)
-{
- char buf[1];
- return send_file_chunk (g, 0, buf, 0);
-}
-
-static int
-send_file_chunk (guestfs_h *g, int cancel, const char *buf, size_t buflen)
-{
- u_int32_t len;
- int r;
- guestfs_chunk chunk;
- XDR xdr;
- char *msg_out;
- size_t msg_out_size;
-
- if (g->state != BUSY) {
- error (g, _("send_file_chunk: state %d != READY"), g->state);
- return -1;
- }
-
- /* Allocate the chunk buffer. Don't use the stack to avoid
- * excessive stack usage and unnecessary copies.
- */
- msg_out = safe_malloc (g, GUESTFS_MAX_CHUNK_SIZE + 4 + 48);
- xdrmem_create (&xdr, msg_out + 4, GUESTFS_MAX_CHUNK_SIZE + 48, XDR_ENCODE);
-
- /* Serialize the chunk. */
- chunk.cancel = cancel;
- chunk.data.data_len = buflen;
- chunk.data.data_val = (char *) buf;
-
- if (!xdr_guestfs_chunk (&xdr, &chunk)) {
- error (g, _("xdr_guestfs_chunk failed (buf = %p, buflen = %zu)"),
- buf, buflen);
- xdr_destroy (&xdr);
- goto cleanup1;
- }
-
- len = xdr_getpos (&xdr);
- xdr_destroy (&xdr);
-
- /* Reduce the size of the outgoing message buffer to the real length. */
- msg_out = safe_realloc (g, msg_out, len + 4);
- msg_out_size = len + 4;
-
- xdrmem_create (&xdr, msg_out, 4, XDR_ENCODE);
- xdr_uint32_t (&xdr, &len);
-
- r = send_to_daemon (g, msg_out, msg_out_size);
-
- /* Did the daemon send a cancellation message? */
- if (r == -2) {
- if (g->verbose)
- fprintf (stderr, "got daemon cancellation\n");
- return -2;
- }
-
- if (r == -1)
- goto cleanup1;
-
- free (msg_out);
-
- return 0;
-
- cleanup1:
- free (msg_out);
- return -1;
-}
-
-/* Receive a reply. */
-int
-guestfs___recv (guestfs_h *g, const char *fn,
- guestfs_message_header *hdr,
- guestfs_message_error *err,
- xdrproc_t xdrp, char *ret)
-{
- XDR xdr;
- void *buf;
- uint32_t size;
- int r;
-
- again:
- r = recv_from_daemon (g, &size, &buf);
- if (r == -1)
- return -1;
-
- /* This can happen if a cancellation happens right at the end
- * of us sending a FileIn parameter to the daemon. Discard. The
- * daemon should send us an error message next.
- */
- if (size == GUESTFS_CANCEL_FLAG)
- goto again;
-
- if (size == GUESTFS_LAUNCH_FLAG) {
- error (g, "%s: received unexpected launch flag from daemon when expecting reply", fn);
- return -1;
- }
-
- xdrmem_create (&xdr, buf, size, XDR_DECODE);
-
- if (!xdr_guestfs_message_header (&xdr, hdr)) {
- error (g, "%s: failed to parse reply header", fn);
- xdr_destroy (&xdr);
- free (buf);
- return -1;
- }
- if (hdr->status == GUESTFS_STATUS_ERROR) {
- if (!xdr_guestfs_message_error (&xdr, err)) {
- error (g, "%s: failed to parse reply error", fn);
- xdr_destroy (&xdr);
- free (buf);
- return -1;
- }
- } else {
- if (xdrp && ret && !xdrp (&xdr, ret)) {
- error (g, "%s: failed to parse reply", fn);
- xdr_destroy (&xdr);
- free (buf);
- return -1;
- }
- }
- xdr_destroy (&xdr);
- free (buf);
-
- return 0;
-}
-
-/* Receive a file. */
-
-/* Returns -1 = error, 0 = EOF, > 0 = more data */
-static ssize_t receive_file_data (guestfs_h *g, void **buf);
-
-int
-guestfs___recv_file (guestfs_h *g, const char *filename)
-{
- void *buf;
- int fd, r;
-
- fd = open (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0666);
- if (fd == -1) {
- perrorf (g, "open: %s", filename);
- goto cancel;
- }
-
- /* Receive the file in chunked encoding. */
- while ((r = receive_file_data (g, &buf)) > 0) {
- if (xwrite (fd, buf, r) == -1) {
- perrorf (g, "%s: write", filename);
- free (buf);
- goto cancel;
- }
- free (buf);
- }
-
- if (r == -1) {
- error (g, _("%s: error in chunked encoding"), filename);
- return -1;
- }
-
- if (close (fd) == -1) {
- perrorf (g, "close: %s", filename);
- return -1;
- }
-
- return 0;
-
- cancel: ;
- /* Send cancellation message to daemon, then wait until it
- * cancels (just throwing away data).
- */
- XDR xdr;
- char fbuf[4];
- uint32_t flag = GUESTFS_CANCEL_FLAG;
-
- if (g->verbose)
- fprintf (stderr, "%s: waiting for daemon to acknowledge cancellation\n",
- __func__);
-
- xdrmem_create (&xdr, fbuf, sizeof fbuf, XDR_ENCODE);
- xdr_uint32_t (&xdr, &flag);
- xdr_destroy (&xdr);
-
- if (xwrite (g->sock, fbuf, sizeof fbuf) == -1) {
- perrorf (g, _("write to daemon socket"));
- return -1;
- }
-
- while (receive_file_data (g, NULL) > 0)
- ; /* just discard it */
-
- return -1;
-}
-
-/* Receive a chunk of file data. */
-/* Returns -1 = error, 0 = EOF, > 0 = more data */
-static ssize_t
-receive_file_data (guestfs_h *g, void **buf_r)
-{
- int r;
- void *buf;
- uint32_t len;
- XDR xdr;
- guestfs_chunk chunk;
-
- r = recv_from_daemon (g, &len, &buf);
- if (r == -1) {
- error (g, _("receive_file_data: parse error in reply callback"));
- return -1;
- }
-
- if (len == GUESTFS_LAUNCH_FLAG || len == GUESTFS_CANCEL_FLAG) {
- error (g, _("receive_file_data: unexpected flag received when reading file chunks"));
- return -1;
- }
-
- memset (&chunk, 0, sizeof chunk);
-
- xdrmem_create (&xdr, buf, len, XDR_DECODE);
- if (!xdr_guestfs_chunk (&xdr, &chunk)) {
- error (g, _("failed to parse file chunk"));
- free (buf);
- return -1;
- }
- xdr_destroy (&xdr);
- /* After decoding, the original buffer is no longer used. */
- free (buf);
-
- if (chunk.cancel) {
- error (g, _("file receive cancelled by daemon"));
- free (chunk.data.data_val);
- return -1;
- }
-
- if (chunk.data.data_len == 0) { /* end of transfer */
- free (chunk.data.data_val);
- return 0;
- }
-
- if (buf_r) *buf_r = chunk.data.data_val;
- else free (chunk.data.data_val); /* else caller frees */
-
- return chunk.data.data_len;
-}
--- /dev/null
+/* libguestfs
+ * Copyright (C) 2009-2010 Red Hat Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#define _BSD_SOURCE /* for mkdtemp, usleep */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <time.h>
+#include <sys/stat.h>
+#include <sys/select.h>
+#include <dirent.h>
+#include <signal.h>
+
+#include <rpc/types.h>
+#include <rpc/xdr.h>
+
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+
+#ifdef HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+#include "c-ctype.h"
+#include "glthread/lock.h"
+#include "ignore-value.h"
+
+#include "guestfs.h"
+#include "guestfs-internal.h"
+#include "guestfs-internal-actions.h"
+#include "guestfs_protocol.h"
+
+static int check_peer_euid (guestfs_h *g, int sock, uid_t *rtn);
+static int qemu_supports (guestfs_h *g, const char *option);
+
+/* Add a string to the current command line. */
+static void
+incr_cmdline_size (guestfs_h *g)
+{
+ if (g->cmdline == NULL) {
+ /* g->cmdline[0] is reserved for argv[0], set in guestfs_launch. */
+ g->cmdline_size = 1;
+ g->cmdline = safe_malloc (g, sizeof (char *));
+ g->cmdline[0] = NULL;
+ }
+
+ g->cmdline_size++;
+ g->cmdline = safe_realloc (g, g->cmdline, sizeof (char *) * g->cmdline_size);
+}
+
+static int
+add_cmdline (guestfs_h *g, const char *str)
+{
+ if (g->state != CONFIG) {
+ error (g,
+ _("command line cannot be altered after qemu subprocess launched"));
+ return -1;
+ }
+
+ incr_cmdline_size (g);
+ g->cmdline[g->cmdline_size-1] = safe_strdup (g, str);
+ return 0;
+}
+
+int
+guestfs__config (guestfs_h *g,
+ const char *qemu_param, const char *qemu_value)
+{
+ if (qemu_param[0] != '-') {
+ error (g, _("guestfs_config: parameter must begin with '-' character"));
+ return -1;
+ }
+
+ /* A bit fascist, but the user will probably break the extra
+ * parameters that we add if they try to set any of these.
+ */
+ if (STREQ (qemu_param, "-kernel") ||
+ STREQ (qemu_param, "-initrd") ||
+ STREQ (qemu_param, "-nographic") ||
+ STREQ (qemu_param, "-serial") ||
+ STREQ (qemu_param, "-full-screen") ||
+ STREQ (qemu_param, "-std-vga") ||
+ STREQ (qemu_param, "-vnc")) {
+ error (g, _("guestfs_config: parameter '%s' isn't allowed"), qemu_param);
+ return -1;
+ }
+
+ if (add_cmdline (g, qemu_param) != 0) return -1;
+
+ if (qemu_value != NULL) {
+ if (add_cmdline (g, qemu_value) != 0) return -1;
+ }
+
+ return 0;
+}
+
+int
+guestfs__add_drive_with_if (guestfs_h *g, const char *filename,
+ const char *drive_if)
+{
+ size_t len = strlen (filename) + 64;
+ char buf[len];
+
+ if (strchr (filename, ',') != NULL) {
+ error (g, _("filename cannot contain ',' (comma) character"));
+ return -1;
+ }
+
+ /* cache=off improves reliability in the event of a host crash.
+ *
+ * However this option causes qemu to try to open the file with
+ * O_DIRECT. This fails on some filesystem types (notably tmpfs).
+ * So we check if we can open the file with or without O_DIRECT,
+ * and use cache=off (or not) accordingly.
+ *
+ * This test also checks for the presence of the file, which
+ * is a documented semantic of this interface.
+ */
+ int fd = open (filename, O_RDONLY|O_DIRECT);
+ if (fd >= 0) {
+ close (fd);
+ snprintf (buf, len, "file=%s,cache=off,if=%s", filename, drive_if);
+ } else {
+ fd = open (filename, O_RDONLY);
+ if (fd >= 0) {
+ close (fd);
+ snprintf (buf, len, "file=%s,if=%s", filename, drive_if);
+ } else {
+ perrorf (g, "%s", filename);
+ return -1;
+ }
+ }
+
+ return guestfs__config (g, "-drive", buf);
+}
+
+int
+guestfs__add_drive_ro_with_if (guestfs_h *g, const char *filename,
+ const char *drive_if)
+{
+ if (strchr (filename, ',') != NULL) {
+ error (g, _("filename cannot contain ',' (comma) character"));
+ return -1;
+ }
+
+ if (access (filename, F_OK) == -1) {
+ perrorf (g, "%s", filename);
+ return -1;
+ }
+
+ size_t len = strlen (filename) + 64;
+ char buf[len];
+
+ snprintf (buf, len, "file=%s,snapshot=on,if=%s", filename, drive_if);
+
+ return guestfs__config (g, "-drive", buf);
+}
+
+int
+guestfs__add_drive (guestfs_h *g, const char *filename)
+{
+ return guestfs__add_drive_with_if (g, filename, DRIVE_IF);
+}
+
+int
+guestfs__add_drive_ro (guestfs_h *g, const char *filename)
+{
+ return guestfs__add_drive_ro_with_if (g, filename, DRIVE_IF);
+}
+
+int
+guestfs__add_cdrom (guestfs_h *g, const char *filename)
+{
+ if (strchr (filename, ',') != NULL) {
+ error (g, _("filename cannot contain ',' (comma) character"));
+ return -1;
+ }
+
+ if (access (filename, F_OK) == -1) {
+ perrorf (g, "%s", filename);
+ return -1;
+ }
+
+ return guestfs__config (g, "-cdrom", filename);
+}
+
+/* Returns true iff file is contained in dir. */
+static int
+dir_contains_file (const char *dir, const char *file)
+{
+ int dirlen = strlen (dir);
+ int filelen = strlen (file);
+ int len = dirlen+filelen+2;
+ char path[len];
+
+ snprintf (path, len, "%s/%s", dir, file);
+ return access (path, F_OK) == 0;
+}
+
+/* Returns true iff every listed file is contained in 'dir'. */
+static int
+dir_contains_files (const char *dir, ...)
+{
+ va_list args;
+ const char *file;
+
+ va_start (args, dir);
+ while ((file = va_arg (args, const char *)) != NULL) {
+ if (!dir_contains_file (dir, file)) {
+ va_end (args);
+ return 0;
+ }
+ }
+ va_end (args);
+ return 1;
+}
+
+static void print_timestamped_message (guestfs_h *g, const char *fs, ...);
+static int build_supermin_appliance (guestfs_h *g, const char *path, char **kernel, char **initrd);
+static int is_openable (guestfs_h *g, const char *path, int flags);
+static void print_cmdline (guestfs_h *g);
+
+static const char *kernel_name = "vmlinuz." REPO "." host_cpu;
+static const char *initrd_name = "initramfs." REPO "." host_cpu ".img";
+
+int
+guestfs__launch (guestfs_h *g)
+{
+ const char *tmpdir;
+ char dir_template[PATH_MAX];
+ int r, pmore;
+ size_t len;
+ int wfd[2], rfd[2];
+ int tries;
+ char *path, *pelem, *pend;
+ char *kernel = NULL, *initrd = NULL;
+ int null_vmchannel_sock;
+ char unixsock[256];
+ struct sockaddr_un addr;
+
+ /* Configured? */
+ if (!g->cmdline) {
+ error (g, _("you must call guestfs_add_drive before guestfs_launch"));
+ return -1;
+ }
+
+ if (g->state != CONFIG) {
+ error (g, _("the libguestfs handle has already been launched"));
+ return -1;
+ }
+
+ /* Start the clock ... */
+ gettimeofday (&g->launch_t, NULL);
+
+ /* Make the temporary directory. */
+#ifdef P_tmpdir
+ tmpdir = P_tmpdir;
+#else
+ tmpdir = "/tmp";
+#endif
+
+ tmpdir = getenv ("TMPDIR") ? : tmpdir;
+ snprintf (dir_template, sizeof dir_template, "%s/libguestfsXXXXXX", tmpdir);
+
+ if (!g->tmpdir) {
+ g->tmpdir = safe_strdup (g, dir_template);
+ if (mkdtemp (g->tmpdir) == NULL) {
+ perrorf (g, _("%s: cannot create temporary directory"), dir_template);
+ goto cleanup0;
+ }
+ }
+
+ /* Allow anyone to read the temporary directory. There are no
+ * secrets in the kernel or initrd files. The socket in this
+ * directory won't be readable but anyone can see it exists if they
+ * want. (RHBZ#610880).
+ */
+ if (chmod (g->tmpdir, 0755) == -1)
+ fprintf (stderr, "chmod: %s: %m (ignored)\n", g->tmpdir);
+
+ /* First search g->path for the supermin appliance, and try to
+ * synthesize a kernel and initrd from that. If it fails, we
+ * try the path search again looking for a backup ordinary
+ * appliance.
+ */
+ pelem = path = safe_strdup (g, g->path);
+ do {
+ pend = strchrnul (pelem, ':');
+ pmore = *pend == ':';
+ *pend = '\0';
+ len = pend - pelem;
+
+ /* Empty element of "." means cwd. */
+ if (len == 0 || (len == 1 && *pelem == '.')) {
+ if (g->verbose)
+ fprintf (stderr,
+ "looking for supermin appliance in current directory\n");
+ if (dir_contains_files (".",
+ "supermin.d", "kmod.whitelist", NULL)) {
+ if (build_supermin_appliance (g, ".", &kernel, &initrd) == -1)
+ return -1;
+ break;
+ }
+ }
+ /* Look at <path>/supermin* etc. */
+ else {
+ if (g->verbose)
+ fprintf (stderr, "looking for supermin appliance in %s\n", pelem);
+
+ if (dir_contains_files (pelem,
+ "supermin.d", "kmod.whitelist", NULL)) {
+ if (build_supermin_appliance (g, pelem, &kernel, &initrd) == -1)
+ return -1;
+ break;
+ }
+ }
+
+ pelem = pend + 1;
+ } while (pmore);
+
+ free (path);
+
+ if (kernel == NULL || initrd == NULL) {
+ /* Search g->path for the kernel and initrd. */
+ pelem = path = safe_strdup (g, g->path);
+ do {
+ pend = strchrnul (pelem, ':');
+ pmore = *pend == ':';
+ *pend = '\0';
+ len = pend - pelem;
+
+ /* Empty element or "." means cwd. */
+ if (len == 0 || (len == 1 && *pelem == '.')) {
+ if (g->verbose)
+ fprintf (stderr,
+ "looking for appliance in current directory\n");
+ if (dir_contains_files (".", kernel_name, initrd_name, NULL)) {
+ kernel = safe_strdup (g, kernel_name);
+ initrd = safe_strdup (g, initrd_name);
+ break;
+ }
+ }
+ /* Look at <path>/kernel etc. */
+ else {
+ if (g->verbose)
+ fprintf (stderr, "looking for appliance in %s\n", pelem);
+
+ if (dir_contains_files (pelem, kernel_name, initrd_name, NULL)) {
+ kernel = safe_malloc (g, len + strlen (kernel_name) + 2);
+ initrd = safe_malloc (g, len + strlen (initrd_name) + 2);
+ sprintf (kernel, "%s/%s", pelem, kernel_name);
+ sprintf (initrd, "%s/%s", pelem, initrd_name);
+ break;
+ }
+ }
+
+ pelem = pend + 1;
+ } while (pmore);
+
+ free (path);
+ }
+
+ if (kernel == NULL || initrd == NULL) {
+ error (g, _("cannot find %s or %s on LIBGUESTFS_PATH (current path = %s)"),
+ kernel_name, initrd_name, g->path);
+ goto cleanup0;
+ }
+
+ if (g->verbose)
+ print_timestamped_message (g, "begin testing qemu features");
+
+ /* Get qemu help text and version. */
+ if (qemu_supports (g, NULL) == -1)
+ goto cleanup0;
+
+ /* Choose which vmchannel implementation to use. */
+ if (CAN_CHECK_PEER_EUID && qemu_supports (g, "-net user")) {
+ /* The "null vmchannel" implementation. Requires SLIRP (user mode
+ * networking in qemu) but no other vmchannel support. The daemon
+ * will connect back to a random port number on localhost.
+ */
+ struct sockaddr_in addr;
+ socklen_t addrlen = sizeof addr;
+
+ g->sock = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
+ if (g->sock == -1) {
+ perrorf (g, "socket");
+ goto cleanup0;
+ }
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons (0);
+ addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
+ if (bind (g->sock, (struct sockaddr *) &addr, addrlen) == -1) {
+ perrorf (g, "bind");
+ goto cleanup0;
+ }
+
+ if (listen (g->sock, 256) == -1) {
+ perrorf (g, "listen");
+ goto cleanup0;
+ }
+
+ if (getsockname (g->sock, (struct sockaddr *) &addr, &addrlen) == -1) {
+ perrorf (g, "getsockname");
+ goto cleanup0;
+ }
+
+ if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
+ perrorf (g, "fcntl");
+ goto cleanup0;
+ }
+
+ null_vmchannel_sock = ntohs (addr.sin_port);
+ if (g->verbose)
+ fprintf (stderr, "null_vmchannel_sock = %d\n", null_vmchannel_sock);
+ } else {
+ /* Using some vmchannel impl. We need to create a local Unix
+ * domain socket for qemu to use.
+ */
+ snprintf (unixsock, sizeof unixsock, "%s/sock", g->tmpdir);
+ unlink (unixsock);
+ null_vmchannel_sock = 0;
+ }
+
+ if (!g->direct) {
+ if (pipe (wfd) == -1 || pipe (rfd) == -1) {
+ perrorf (g, "pipe");
+ goto cleanup0;
+ }
+ }
+
+ if (g->verbose)
+ print_timestamped_message (g, "finished testing qemu features");
+
+ r = fork ();
+ if (r == -1) {
+ perrorf (g, "fork");
+ if (!g->direct) {
+ close (wfd[0]);
+ close (wfd[1]);
+ close (rfd[0]);
+ close (rfd[1]);
+ }
+ goto cleanup0;
+ }
+
+ if (r == 0) { /* Child (qemu). */
+ char buf[256];
+ const char *vmchannel = NULL;
+
+ /* Set up the full command line. Do this in the subprocess so we
+ * don't need to worry about cleaning up.
+ */
+ g->cmdline[0] = g->qemu;
+
+ /* qemu sometimes needs this option to enable hardware
+ * virtualization, but some versions of 'qemu-kvm' will use KVM
+ * regardless (even where this option appears in the help text).
+ * It is rumoured that there are versions of qemu where supplying
+ * this option when hardware virtualization is not available will
+ * cause qemu to fail, so we we have to check at least that
+ * /dev/kvm is openable. That's not reliable, since /dev/kvm
+ * might be openable by qemu but not by us (think: SELinux) in
+ * which case the user would not get hardware virtualization,
+ * although at least shouldn't fail. A giant clusterfuck with the
+ * qemu command line, again.
+ */
+ if (qemu_supports (g, "-enable-kvm") &&
+ is_openable (g, "/dev/kvm", O_RDWR))
+ add_cmdline (g, "-enable-kvm");
+
+ /* Newer versions of qemu (from around 2009/12) changed the
+ * behaviour of monitors so that an implicit '-monitor stdio' is
+ * assumed if we are in -nographic mode and there is no other
+ * -monitor option. Only a single stdio device is allowed, so
+ * this broke the '-serial stdio' option. There is a new flag
+ * called -nodefaults which gets rid of all this default crud, so
+ * let's use that to avoid this and any future surprises.
+ */
+ if (qemu_supports (g, "-nodefaults"))
+ add_cmdline (g, "-nodefaults");
+
+ add_cmdline (g, "-nographic");
+ add_cmdline (g, "-serial");
+ add_cmdline (g, "stdio");
+
+ snprintf (buf, sizeof buf, "%d", g->memsize);
+ add_cmdline (g, "-m");
+ add_cmdline (g, buf);
+
+ /* Force exit instead of reboot on panic */
+ add_cmdline (g, "-no-reboot");
+
+ /* These options recommended by KVM developers to improve reliability. */
+ if (qemu_supports (g, "-no-hpet"))
+ add_cmdline (g, "-no-hpet");
+
+ if (qemu_supports (g, "-rtc-td-hack"))
+ add_cmdline (g, "-rtc-td-hack");
+
+ /* If qemu has SLIRP (user mode network) enabled then we can get
+ * away with "no vmchannel", where we just connect back to a random
+ * host port.
+ */
+ if (null_vmchannel_sock) {
+ add_cmdline (g, "-net");
+ add_cmdline (g, "user,vlan=0,net=" NETWORK);
+
+ snprintf (buf, sizeof buf,
+ "guestfs_vmchannel=tcp:" ROUTER ":%d",
+ null_vmchannel_sock);
+ vmchannel = strdup (buf);
+ }
+
+ /* New-style -net user,guestfwd=... syntax for guestfwd. See:
+ *
+ * http://git.savannah.gnu.org/cgit/qemu.git/commit/?id=c92ef6a22d3c71538fcc48fb61ad353f7ba03b62
+ *
+ * The original suggested format doesn't work, see:
+ *
+ * http://lists.gnu.org/archive/html/qemu-devel/2009-07/msg01654.html
+ *
+ * However Gerd Hoffman privately suggested to me using -chardev
+ * instead, which does work.
+ */
+ else if (qemu_supports (g, "-chardev") && qemu_supports (g, "guestfwd")) {
+ snprintf (buf, sizeof buf,
+ "socket,id=guestfsvmc,path=%s,server,nowait", unixsock);
+
+ add_cmdline (g, "-chardev");
+ add_cmdline (g, buf);
+
+ snprintf (buf, sizeof buf,
+ "user,vlan=0,net=" NETWORK ","
+ "guestfwd=tcp:" GUESTFWD_ADDR ":" GUESTFWD_PORT
+ "-chardev:guestfsvmc");
+
+ add_cmdline (g, "-net");
+ add_cmdline (g, buf);
+
+ vmchannel = "guestfs_vmchannel=tcp:" GUESTFWD_ADDR ":" GUESTFWD_PORT;
+ }
+
+ /* Not guestfwd. HOPEFULLY this qemu uses the older -net channel
+ * syntax, or if not then we'll get a quick failure.
+ */
+ else {
+ snprintf (buf, sizeof buf,
+ "channel," GUESTFWD_PORT ":unix:%s,server,nowait", unixsock);
+
+ add_cmdline (g, "-net");
+ add_cmdline (g, buf);
+ add_cmdline (g, "-net");
+ add_cmdline (g, "user,vlan=0,net=" NETWORK);
+
+ vmchannel = "guestfs_vmchannel=tcp:" GUESTFWD_ADDR ":" GUESTFWD_PORT;
+ }
+ add_cmdline (g, "-net");
+ add_cmdline (g, "nic,model=" NET_IF ",vlan=0");
+
+#define LINUX_CMDLINE \
+ "panic=1 " /* force kernel to panic if daemon exits */ \
+ "console=ttyS0 " /* serial console */ \
+ "udevtimeout=300 " /* good for very slow systems (RHBZ#480319) */ \
+ "noapic " /* workaround for RHBZ#502058 - ok if not SMP */ \
+ "acpi=off " /* we don't need ACPI, turn it off */ \
+ "printk.time=1 " /* display timestamp before kernel messages */ \
+ "cgroup_disable=memory " /* saves us about 5 MB of RAM */
+
+ /* Linux kernel command line. */
+ snprintf (buf, sizeof buf,
+ LINUX_CMDLINE
+ "%s " /* (selinux) */
+ "%s " /* (vmchannel) */
+ "%s " /* (verbose) */
+ "TERM=%s " /* (TERM environment variable) */
+ "%s", /* (append) */
+ g->selinux ? "selinux=1 enforcing=0" : "selinux=0",
+ vmchannel ? vmchannel : "",
+ g->verbose ? "guestfs_verbose=1" : "",
+ getenv ("TERM") ? : "linux",
+ g->append ? g->append : "");
+
+ add_cmdline (g, "-kernel");
+ add_cmdline (g, (char *) kernel);
+ add_cmdline (g, "-initrd");
+ add_cmdline (g, (char *) initrd);
+ add_cmdline (g, "-append");
+ add_cmdline (g, buf);
+
+ /* Finish off the command line. */
+ incr_cmdline_size (g);
+ g->cmdline[g->cmdline_size-1] = NULL;
+
+ if (g->verbose)
+ print_cmdline (g);
+
+ if (!g->direct) {
+ /* Set up stdin, stdout. */
+ close (0);
+ close (1);
+ close (wfd[1]);
+ close (rfd[0]);
+
+ if (dup (wfd[0]) == -1) {
+ dup_failed:
+ perror ("dup failed");
+ _exit (EXIT_FAILURE);
+ }
+ if (dup (rfd[1]) == -1)
+ goto dup_failed;
+
+ close (wfd[0]);
+ close (rfd[1]);
+ }
+
+#if 0
+ /* Set up a new process group, so we can signal this process
+ * and all subprocesses (eg. if qemu is really a shell script).
+ */
+ setpgid (0, 0);
+#endif
+
+ setenv ("LC_ALL", "C", 1);
+
+ execv (g->qemu, g->cmdline); /* Run qemu. */
+ perror (g->qemu);
+ _exit (EXIT_FAILURE);
+ }
+
+ /* Parent (library). */
+ g->pid = r;
+
+ free (kernel);
+ kernel = NULL;
+ free (initrd);
+ initrd = NULL;
+
+ /* Fork the recovery process off which will kill qemu if the parent
+ * process fails to do so (eg. if the parent segfaults).
+ */
+ g->recoverypid = -1;
+ if (g->recovery_proc) {
+ r = fork ();
+ if (r == 0) {
+ pid_t qemu_pid = g->pid;
+ pid_t parent_pid = getppid ();
+
+ /* Writing to argv is hideously complicated and error prone. See:
+ * http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/ps_status.c?rev=1.33.2.1;content-type=text%2Fplain
+ */
+
+ /* Loop around waiting for one or both of the other processes to
+ * disappear. It's fair to say this is very hairy. The PIDs that
+ * we are looking at might be reused by another process. We are
+ * effectively polling. Is the cure worse than the disease?
+ */
+ for (;;) {
+ if (kill (qemu_pid, 0) == -1) /* qemu's gone away, we aren't needed */
+ _exit (EXIT_SUCCESS);
+ if (kill (parent_pid, 0) == -1) {
+ /* Parent's gone away, qemu still around, so kill qemu. */
+ kill (qemu_pid, 9);
+ _exit (EXIT_SUCCESS);
+ }
+ sleep (2);
+ }
+ }
+
+ /* Don't worry, if the fork failed, this will be -1. The recovery
+ * process isn't essential.
+ */
+ g->recoverypid = r;
+ }
+
+ if (!g->direct) {
+ /* Close the other ends of the pipe. */
+ close (wfd[0]);
+ close (rfd[1]);
+
+ if (fcntl (wfd[1], F_SETFL, O_NONBLOCK) == -1 ||
+ fcntl (rfd[0], F_SETFL, O_NONBLOCK) == -1) {
+ perrorf (g, "fcntl");
+ goto cleanup1;
+ }
+
+ g->fd[0] = wfd[1]; /* stdin of child */
+ g->fd[1] = rfd[0]; /* stdout of child */
+ } else {
+ g->fd[0] = open ("/dev/null", O_RDWR);
+ if (g->fd[0] == -1) {
+ perrorf (g, "open /dev/null");
+ goto cleanup1;
+ }
+ g->fd[1] = dup (g->fd[0]);
+ if (g->fd[1] == -1) {
+ perrorf (g, "dup");
+ close (g->fd[0]);
+ goto cleanup1;
+ }
+ }
+
+ if (null_vmchannel_sock) {
+ int sock = -1;
+ uid_t uid;
+
+ /* Null vmchannel implementation: We listen on g->sock for a
+ * connection. The connection could come from any local process
+ * so we must check it comes from the appliance (or at least
+ * from our UID) for security reasons.
+ */
+ while (sock == -1) {
+ sock = guestfs__accept_from_daemon (g);
+ if (sock == -1)
+ goto cleanup1;
+
+ if (check_peer_euid (g, sock, &uid) == -1)
+ goto cleanup1;
+ if (uid != geteuid ()) {
+ fprintf (stderr,
+ "libguestfs: warning: unexpected connection from UID %d to port %d\n",
+ uid, null_vmchannel_sock);
+ close (sock);
+ sock = -1;
+ continue;
+ }
+ }
+
+ if (fcntl (sock, F_SETFL, O_NONBLOCK) == -1) {
+ perrorf (g, "fcntl");
+ goto cleanup1;
+ }
+
+ close (g->sock);
+ g->sock = sock;
+ } else {
+ /* Other vmchannel. Open the Unix socket.
+ *
+ * The vmchannel implementation that got merged with qemu sucks in
+ * a number of ways. Both ends do connect(2), which means that no
+ * one knows what, if anything, is connected to the other end, or
+ * if it becomes disconnected. Even worse, we have to wait some
+ * indeterminate time for qemu to create the socket and connect to
+ * it (which happens very early in qemu's start-up), so any code
+ * that uses vmchannel is inherently racy. Hence this silly loop.
+ */
+ g->sock = socket (AF_UNIX, SOCK_STREAM, 0);
+ if (g->sock == -1) {
+ perrorf (g, "socket");
+ goto cleanup1;
+ }
+
+ if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
+ perrorf (g, "fcntl");
+ goto cleanup1;
+ }
+
+ addr.sun_family = AF_UNIX;
+ strncpy (addr.sun_path, unixsock, UNIX_PATH_MAX);
+ addr.sun_path[UNIX_PATH_MAX-1] = '\0';
+
+ tries = 100;
+ /* Always sleep at least once to give qemu a small chance to start up. */
+ usleep (10000);
+ while (tries > 0) {
+ r = connect (g->sock, (struct sockaddr *) &addr, sizeof addr);
+ if ((r == -1 && errno == EINPROGRESS) || r == 0)
+ goto connected;
+
+ if (errno != ENOENT)
+ perrorf (g, "connect");
+ tries--;
+ usleep (100000);
+ }
+
+ error (g, _("failed to connect to vmchannel socket"));
+ goto cleanup1;
+
+ connected: ;
+ }
+
+ g->state = LAUNCHING;
+
+ /* Wait for qemu to start and to connect back to us via vmchannel and
+ * send the GUESTFS_LAUNCH_FLAG message.
+ */
+ uint32_t size;
+ void *buf = NULL;
+ r = guestfs__recv_from_daemon (g, &size, &buf);
+ free (buf);
+
+ if (r == -1) return -1;
+
+ if (size != GUESTFS_LAUNCH_FLAG) {
+ error (g, _("guestfs_launch failed, see earlier error messages"));
+ goto cleanup1;
+ }
+
+ if (g->verbose)
+ print_timestamped_message (g, "appliance is up");
+
+ /* This is possible in some really strange situations, such as
+ * guestfsd starts up OK but then qemu immediately exits. Check for
+ * it because the caller is probably expecting to be able to send
+ * commands after this function returns.
+ */
+ if (g->state != READY) {
+ error (g, _("qemu launched and contacted daemon, but state != READY"));
+ goto cleanup1;
+ }
+
+ return 0;
+
+ cleanup1:
+ if (!g->direct) {
+ close (wfd[1]);
+ close (rfd[0]);
+ }
+ if (g->pid > 0) kill (g->pid, 9);
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
+ waitpid (g->pid, NULL, 0);
+ if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
+ g->fd[0] = -1;
+ g->fd[1] = -1;
+ g->pid = 0;
+ g->recoverypid = 0;
+ memset (&g->launch_t, 0, sizeof g->launch_t);
+
+ cleanup0:
+ if (g->sock >= 0) {
+ close (g->sock);
+ g->sock = -1;
+ }
+ g->state = CONFIG;
+ free (kernel);
+ free (initrd);
+ return -1;
+}
+
+/* This function is used to print the qemu command line before it gets
+ * executed, when in verbose mode.
+ */
+static void
+print_cmdline (guestfs_h *g)
+{
+ int i = 0;
+ int needs_quote;
+
+ while (g->cmdline[i]) {
+ if (g->cmdline[i][0] == '-') /* -option starts a new line */
+ fprintf (stderr, " \\\n ");
+
+ if (i > 0) fputc (' ', stderr);
+
+ /* Does it need shell quoting? This only deals with simple cases. */
+ needs_quote = strcspn (g->cmdline[i], " ") != strlen (g->cmdline[i]);
+
+ if (needs_quote) fputc ('\'', stderr);
+ fprintf (stderr, "%s", g->cmdline[i]);
+ if (needs_quote) fputc ('\'', stderr);
+ i++;
+ }
+
+ fputc ('\n', stderr);
+}
+
+/* This function does the hard work of building the supermin appliance
+ * on the fly. 'path' is the directory containing the control files.
+ * 'kernel' and 'initrd' are where we will return the names of the
+ * kernel and initrd (only initrd is built). The work is done by
+ * an external script. We just tell it where to put the result.
+ */
+static int
+build_supermin_appliance (guestfs_h *g, const char *path,
+ char **kernel, char **initrd)
+{
+ char cmd[4096];
+ int r, len;
+
+ if (g->verbose)
+ print_timestamped_message (g, "begin building supermin appliance");
+
+ len = strlen (g->tmpdir);
+ *kernel = safe_malloc (g, len + 8);
+ snprintf (*kernel, len+8, "%s/kernel", g->tmpdir);
+ *initrd = safe_malloc (g, len + 8);
+ snprintf (*initrd, len+8, "%s/initrd", g->tmpdir);
+
+ /* Set a sensible umask in the subprocess, so kernel and initrd
+ * output files are world-readable (RHBZ#610880).
+ */
+ snprintf (cmd, sizeof cmd,
+ "umask 0002; "
+ "febootstrap-supermin-helper%s "
+ "-k '%s/kmod.whitelist' "
+ "'%s/supermin.d' "
+ host_cpu " "
+ "%s %s",
+ g->verbose ? " --verbose" : "",
+ path,
+ path,
+ *kernel, *initrd);
+ if (g->verbose)
+ print_timestamped_message (g, "%s", cmd);
+
+ r = system (cmd);
+ if (r == -1 || WEXITSTATUS(r) != 0) {
+ error (g, _("external command failed: %s"), cmd);
+ free (*kernel);
+ free (*initrd);
+ *kernel = *initrd = NULL;
+ return -1;
+ }
+
+ if (g->verbose)
+ print_timestamped_message (g, "finished building supermin appliance");
+
+ return 0;
+}
+
+/* Compute Y - X and return the result in milliseconds.
+ * Approximately the same as this code:
+ * http://www.mpp.mpg.de/~huber/util/timevaldiff.c
+ */
+static int64_t
+timeval_diff (const struct timeval *x, const struct timeval *y)
+{
+ int64_t msec;
+
+ msec = (y->tv_sec - x->tv_sec) * 1000;
+ msec += (y->tv_usec - x->tv_usec) / 1000;
+ return msec;
+}
+
+static void
+print_timestamped_message (guestfs_h *g, const char *fs, ...)
+{
+ va_list args;
+ char *msg;
+ int err;
+ struct timeval tv;
+
+ va_start (args, fs);
+ err = vasprintf (&msg, fs, args);
+ va_end (args);
+
+ if (err < 0) return;
+
+ gettimeofday (&tv, NULL);
+
+ fprintf (stderr, "[%05" PRIi64 "ms] %s\n",
+ timeval_diff (&g->launch_t, &tv), msg);
+
+ free (msg);
+}
+
+static int read_all (guestfs_h *g, FILE *fp, char **ret);
+
+/* Test qemu binary (or wrapper) runs, and do 'qemu -help' and
+ * 'qemu -version' so we know what options this qemu supports and
+ * the version.
+ */
+static int
+test_qemu (guestfs_h *g)
+{
+ char cmd[1024];
+ FILE *fp;
+
+ snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -nographic -help", g->qemu);
+
+ fp = popen (cmd, "r");
+ /* qemu -help should always work (qemu -version OTOH wasn't
+ * supported by qemu 0.9). If this command doesn't work then it
+ * probably indicates that the qemu binary is missing.
+ */
+ if (!fp) {
+ /* XXX This error is never printed, even if the qemu binary
+ * doesn't exist. Why?
+ */
+ error:
+ perrorf (g, _("%s: command failed: If qemu is located on a non-standard path, try setting the LIBGUESTFS_QEMU environment variable."), cmd);
+ return -1;
+ }
+
+ if (read_all (g, fp, &g->qemu_help) == -1)
+ goto error;
+
+ if (pclose (fp) == -1)
+ goto error;
+
+ snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -nographic -version 2>/dev/null",
+ g->qemu);
+
+ fp = popen (cmd, "r");
+ if (fp) {
+ /* Intentionally ignore errors. */
+ read_all (g, fp, &g->qemu_version);
+ pclose (fp);
+ }
+
+ return 0;
+}
+
+static int
+read_all (guestfs_h *g, FILE *fp, char **ret)
+{
+ int r, n = 0;
+ char *p;
+
+ again:
+ if (feof (fp)) {
+ *ret = safe_realloc (g, *ret, n + 1);
+ (*ret)[n] = '\0';
+ return n;
+ }
+
+ *ret = safe_realloc (g, *ret, n + BUFSIZ);
+ p = &(*ret)[n];
+ r = fread (p, 1, BUFSIZ, fp);
+ if (ferror (fp)) {
+ perrorf (g, "read");
+ return -1;
+ }
+ n += r;
+ goto again;
+}
+
+/* Test if option is supported by qemu command line (just by grepping
+ * the help text).
+ *
+ * The first time this is used, it has to run the external qemu
+ * binary. If that fails, it returns -1.
+ *
+ * To just do the first-time run of the qemu binary, call this with
+ * option == NULL, in which case it will return -1 if there was an
+ * error doing that.
+ */
+static int
+qemu_supports (guestfs_h *g, const char *option)
+{
+ if (!g->qemu_help) {
+ if (test_qemu (g) == -1)
+ return -1;
+ }
+
+ if (option == NULL)
+ return 1;
+
+ return strstr (g->qemu_help, option) != NULL;
+}
+
+/* Check if a file can be opened. */
+static int
+is_openable (guestfs_h *g, const char *path, int flags)
+{
+ int fd = open (path, flags);
+ if (fd == -1) {
+ if (g->verbose)
+ perror (path);
+ return 0;
+ }
+ close (fd);
+ return 1;
+}
+
+/* Check the peer effective UID for a TCP socket. Ideally we'd like
+ * SO_PEERCRED for a loopback TCP socket. This isn't possible on
+ * Linux (but it is on Solaris!) so we read /proc/net/tcp instead.
+ */
+static int
+check_peer_euid (guestfs_h *g, int sock, uid_t *rtn)
+{
+#if CAN_CHECK_PEER_EUID
+ struct sockaddr_in peer;
+ socklen_t addrlen = sizeof peer;
+
+ if (getpeername (sock, (struct sockaddr *) &peer, &addrlen) == -1) {
+ perrorf (g, "getpeername");
+ return -1;
+ }
+
+ if (peer.sin_family != AF_INET ||
+ ntohl (peer.sin_addr.s_addr) != INADDR_LOOPBACK) {
+ error (g, "check_peer_euid: unexpected connection from non-IPv4, non-loopback peer (family = %d, addr = %s)",
+ peer.sin_family, inet_ntoa (peer.sin_addr));
+ return -1;
+ }
+
+ struct sockaddr_in our;
+ addrlen = sizeof our;
+ if (getsockname (sock, (struct sockaddr *) &our, &addrlen) == -1) {
+ perrorf (g, "getsockname");
+ return -1;
+ }
+
+ FILE *fp = fopen ("/proc/net/tcp", "r");
+ if (fp == NULL) {
+ perrorf (g, "/proc/net/tcp");
+ return -1;
+ }
+
+ char line[256];
+ if (fgets (line, sizeof line, fp) == NULL) { /* Drop first line. */
+ error (g, "unexpected end of file in /proc/net/tcp");
+ fclose (fp);
+ return -1;
+ }
+
+ while (fgets (line, sizeof line, fp) != NULL) {
+ unsigned line_our_addr, line_our_port, line_peer_addr, line_peer_port;
+ int dummy0, dummy1, dummy2, dummy3, dummy4, dummy5, dummy6;
+ int line_uid;
+
+ if (sscanf (line, "%d:%08X:%04X %08X:%04X %02X %08X:%08X %02X:%08X %08X %d",
+ &dummy0,
+ &line_our_addr, &line_our_port,
+ &line_peer_addr, &line_peer_port,
+ &dummy1, &dummy2, &dummy3, &dummy4, &dummy5, &dummy6,
+ &line_uid) == 12) {
+ /* Note about /proc/net/tcp: local_address and rem_address are
+ * always in network byte order. However the port part is
+ * always in host byte order.
+ *
+ * The sockname and peername that we got above are in network
+ * byte order. So we have to byte swap the port but not the
+ * address part.
+ */
+ if (line_our_addr == our.sin_addr.s_addr &&
+ line_our_port == ntohs (our.sin_port) &&
+ line_peer_addr == peer.sin_addr.s_addr &&
+ line_peer_port == ntohs (peer.sin_port)) {
+ *rtn = line_uid;
+ fclose (fp);
+ return 0;
+ }
+ }
+ }
+
+ error (g, "check_peer_euid: no matching TCP connection found in /proc/net/tcp");
+ fclose (fp);
+ return -1;
+#else /* !CAN_CHECK_PEER_EUID */
+ /* This function exists but should never be called in this
+ * configuration.
+ */
+ abort ();
+#endif /* !CAN_CHECK_PEER_EUID */
+}
+
+/* You had to call this function after launch in versions <= 1.0.70,
+ * but it is now a no-op.
+ */
+int
+guestfs__wait_ready (guestfs_h *g)
+{
+ if (g->state != READY) {
+ error (g, _("qemu has not been launched yet"));
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+guestfs__kill_subprocess (guestfs_h *g)
+{
+ if (g->state == CONFIG) {
+ error (g, _("no subprocess to kill"));
+ return -1;
+ }
+
+ if (g->verbose)
+ fprintf (stderr, "sending SIGTERM to process %d\n", g->pid);
+
+ if (g->pid > 0) kill (g->pid, SIGTERM);
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
+
+ return 0;
+}
+
+/* Access current state. */
+int
+guestfs__is_config (guestfs_h *g)
+{
+ return g->state == CONFIG;
+}
+
+int
+guestfs__is_launching (guestfs_h *g)
+{
+ return g->state == LAUNCHING;
+}
+
+int
+guestfs__is_ready (guestfs_h *g)
+{
+ return g->state == READY;
+}
+
+int
+guestfs__is_busy (guestfs_h *g)
+{
+ return g->state == BUSY;
+}
+
+int
+guestfs__get_state (guestfs_h *g)
+{
+ return g->state;
+}
--- /dev/null
+/* libguestfs
+ * Copyright (C) 2009-2010 Red Hat Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#define _BSD_SOURCE /* for mkdtemp, usleep */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <time.h>
+#include <sys/stat.h>
+#include <sys/select.h>
+#include <dirent.h>
+#include <signal.h>
+
+#include <rpc/types.h>
+#include <rpc/xdr.h>
+
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+
+#ifdef HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+#include "c-ctype.h"
+#include "glthread/lock.h"
+#include "ignore-value.h"
+
+#include "guestfs.h"
+#include "guestfs-internal.h"
+#include "guestfs-internal-actions.h"
+#include "guestfs_protocol.h"
+
+/* This is the code used to send and receive RPC messages and (for
+ * certain types of message) to perform file transfers. This code is
+ * driven from the generated actions (src/actions.c). There
+ * are five different cases to consider:
+ *
+ * (1) A non-daemon function. There is no RPC involved at all, it's
+ * all handled inside the library.
+ *
+ * (2) A simple RPC (eg. "mount"). We write the request, then read
+ * the reply. The sequence of calls is:
+ *
+ * guestfs___set_busy
+ * guestfs___send
+ * guestfs___recv
+ * guestfs___end_busy
+ *
+ * (3) An RPC with FileOut parameters (eg. "upload"). We write the
+ * request, then write the file(s), then read the reply. The sequence
+ * of calls is:
+ *
+ * guestfs___set_busy
+ * guestfs___send
+ * guestfs___send_file (possibly multiple times)
+ * guestfs___recv
+ * guestfs___end_busy
+ *
+ * (4) An RPC with FileIn parameters (eg. "download"). We write the
+ * request, then read the reply, then read the file(s). The sequence
+ * of calls is:
+ *
+ * guestfs___set_busy
+ * guestfs___send
+ * guestfs___recv
+ * guestfs___recv_file (possibly multiple times)
+ * guestfs___end_busy
+ *
+ * (5) Both FileOut and FileIn parameters. There are no calls like
+ * this in the current API, but they would be implemented as a
+ * combination of cases (3) and (4).
+ *
+ * During all writes and reads, we also select(2) on qemu stdout
+ * looking for messages (guestfsd stderr and guest kernel dmesg), and
+ * anything received is passed up through the log_message_cb. This is
+ * also the reason why all the sockets are non-blocking. We also have
+ * to check for EOF (qemu died). All of this is handled by the
+ * functions send_to_daemon and recv_from_daemon.
+ */
+
+static int
+xwrite (int fd, const void *v_buf, size_t len)
+{
+ const char *buf = v_buf;
+ int r;
+
+ while (len > 0) {
+ r = write (fd, buf, len);
+ if (r == -1)
+ return -1;
+
+ buf += r;
+ len -= r;
+ }
+
+ return 0;
+}
+
+int
+guestfs___set_busy (guestfs_h *g)
+{
+ if (g->state != READY) {
+ error (g, _("guestfs_set_busy: called when in state %d != READY"),
+ g->state);
+ return -1;
+ }
+ g->state = BUSY;
+ return 0;
+}
+
+int
+guestfs___end_busy (guestfs_h *g)
+{
+ switch (g->state)
+ {
+ case BUSY:
+ g->state = READY;
+ break;
+ case CONFIG:
+ case READY:
+ break;
+
+ case LAUNCHING:
+ case NO_HANDLE:
+ default:
+ error (g, _("guestfs_end_busy: called when in state %d"), g->state);
+ return -1;
+ }
+ return 0;
+}
+
+/* This is called if we detect EOF, ie. qemu died. */
+static void
+child_cleanup (guestfs_h *g)
+{
+ if (g->verbose)
+ fprintf (stderr, "child_cleanup: %p: child process died\n", g);
+
+ /*if (g->pid > 0) kill (g->pid, SIGTERM);*/
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
+ waitpid (g->pid, NULL, 0);
+ if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
+ close (g->fd[0]);
+ close (g->fd[1]);
+ close (g->sock);
+ g->fd[0] = -1;
+ g->fd[1] = -1;
+ g->sock = -1;
+ g->pid = 0;
+ g->recoverypid = 0;
+ memset (&g->launch_t, 0, sizeof g->launch_t);
+ g->state = CONFIG;
+ if (g->subprocess_quit_cb)
+ g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
+}
+
+static int
+read_log_message_or_eof (guestfs_h *g, int fd, int error_if_eof)
+{
+ char buf[BUFSIZ];
+ int n;
+
+#if 0
+ if (g->verbose)
+ fprintf (stderr,
+ "read_log_message_or_eof: %p g->state = %d, fd = %d\n",
+ g, g->state, fd);
+#endif
+
+ /* QEMU's console emulates a 16550A serial port. The real 16550A
+ * device has a small FIFO buffer (16 bytes) which means here we see
+ * lots of small reads of 1-16 bytes in length, usually single
+ * bytes.
+ */
+ n = read (fd, buf, sizeof buf);
+ if (n == 0) {
+ /* Hopefully this indicates the qemu child process has died. */
+ child_cleanup (g);
+
+ if (error_if_eof) {
+ /* We weren't expecting eof here (called from launch) so place
+ * something in the error buffer. RHBZ#588851.
+ */
+ error (g, "child process died unexpectedly");
+ }
+ return -1;
+ }
+
+ if (n == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ return 0;
+
+ perrorf (g, "read");
+ return -1;
+ }
+
+ /* In verbose mode, copy all log messages to stderr. */
+ if (g->verbose)
+ ignore_value (write (STDERR_FILENO, buf, n));
+
+ /* It's an actual log message, send it upwards if anyone is listening. */
+ if (g->log_message_cb)
+ g->log_message_cb (g, g->log_message_cb_data, buf, n);
+
+ return 0;
+}
+
+static int
+check_for_daemon_cancellation_or_eof (guestfs_h *g, int fd)
+{
+ char buf[4];
+ int n;
+ uint32_t flag;
+ XDR xdr;
+
+ if (g->verbose)
+ fprintf (stderr,
+ "check_for_daemon_cancellation_or_eof: %p g->state = %d, fd = %d\n",
+ g, g->state, fd);
+
+ n = read (fd, buf, 4);
+ if (n == 0) {
+ /* Hopefully this indicates the qemu child process has died. */
+ child_cleanup (g);
+ return -1;
+ }
+
+ if (n == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ return 0;
+
+ perrorf (g, "read");
+ return -1;
+ }
+
+ xdrmem_create (&xdr, buf, 4, XDR_DECODE);
+ xdr_uint32_t (&xdr, &flag);
+ xdr_destroy (&xdr);
+
+ if (flag != GUESTFS_CANCEL_FLAG) {
+ error (g, _("check_for_daemon_cancellation_or_eof: read 0x%x from daemon, expected 0x%x\n"),
+ flag, GUESTFS_CANCEL_FLAG);
+ return -1;
+ }
+
+ return -2;
+}
+
+/* This writes the whole N bytes of BUF to the daemon socket.
+ *
+ * If the whole write is successful, it returns 0.
+ * If there was an error, it returns -1.
+ * If the daemon sent a cancellation message, it returns -2.
+ *
+ * It also checks qemu stdout for log messages and passes those up
+ * through log_message_cb.
+ *
+ * It also checks for EOF (qemu died) and passes that up through the
+ * child_cleanup function above.
+ */
+int
+guestfs__send_to_daemon (guestfs_h *g, const void *v_buf, size_t n)
+{
+ const char *buf = v_buf;
+ fd_set rset, rset2;
+ fd_set wset, wset2;
+
+ if (g->verbose)
+ fprintf (stderr,
+ "send_to_daemon: %p g->state = %d, n = %zu\n", g, g->state, n);
+
+ FD_ZERO (&rset);
+ FD_ZERO (&wset);
+
+ FD_SET (g->fd[1], &rset); /* Read qemu stdout for log messages & EOF. */
+ FD_SET (g->sock, &rset); /* Read socket for cancellation & EOF. */
+ FD_SET (g->sock, &wset); /* Write to socket to send the data. */
+
+ int max_fd = MAX (g->sock, g->fd[1]);
+
+ while (n > 0) {
+ rset2 = rset;
+ wset2 = wset;
+ int r = select (max_fd+1, &rset2, &wset2, NULL, NULL);
+ if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+ perrorf (g, "select");
+ return -1;
+ }
+
+ if (FD_ISSET (g->fd[1], &rset2)) {
+ if (read_log_message_or_eof (g, g->fd[1], 0) == -1)
+ return -1;
+ }
+ if (FD_ISSET (g->sock, &rset2)) {
+ r = check_for_daemon_cancellation_or_eof (g, g->sock);
+ if (r < 0)
+ return r;
+ }
+ if (FD_ISSET (g->sock, &wset2)) {
+ r = write (g->sock, buf, n);
+ if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+ perrorf (g, "write");
+ if (errno == EPIPE) /* Disconnected from guest (RHBZ#508713). */
+ child_cleanup (g);
+ return -1;
+ }
+ buf += r;
+ n -= r;
+ }
+ }
+
+ return 0;
+}
+
+/* This reads a single message, file chunk, launch flag or
+ * cancellation flag from the daemon. If something was read, it
+ * returns 0, otherwise -1.
+ *
+ * Both size_rtn and buf_rtn must be passed by the caller as non-NULL.
+ *
+ * *size_rtn returns the size of the returned message or it may be
+ * GUESTFS_LAUNCH_FLAG or GUESTFS_CANCEL_FLAG.
+ *
+ * *buf_rtn is returned containing the message (if any) or will be set
+ * to NULL. *buf_rtn must be freed by the caller.
+ *
+ * It also checks qemu stdout for log messages and passes those up
+ * through log_message_cb.
+ *
+ * It also checks for EOF (qemu died) and passes that up through the
+ * child_cleanup function above.
+ */
+int
+guestfs__recv_from_daemon (guestfs_h *g, uint32_t *size_rtn, void **buf_rtn)
+{
+ fd_set rset, rset2;
+
+ if (g->verbose)
+ fprintf (stderr,
+ "recv_from_daemon: %p g->state = %d, size_rtn = %p, buf_rtn = %p\n",
+ g, g->state, size_rtn, buf_rtn);
+
+ FD_ZERO (&rset);
+
+ FD_SET (g->fd[1], &rset); /* Read qemu stdout for log messages & EOF. */
+ FD_SET (g->sock, &rset); /* Read socket for data & EOF. */
+
+ int max_fd = MAX (g->sock, g->fd[1]);
+
+ *size_rtn = 0;
+ *buf_rtn = NULL;
+
+ char lenbuf[4];
+ /* nr is the size of the message, but we prime it as -4 because we
+ * have to read the message length word first.
+ */
+ ssize_t nr = -4;
+
+ while (nr < (ssize_t) *size_rtn) {
+ rset2 = rset;
+ int r = select (max_fd+1, &rset2, NULL, NULL, NULL);
+ if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+ perrorf (g, "select");
+ free (*buf_rtn);
+ *buf_rtn = NULL;
+ return -1;
+ }
+
+ if (FD_ISSET (g->fd[1], &rset2)) {
+ if (read_log_message_or_eof (g, g->fd[1], 0) == -1) {
+ free (*buf_rtn);
+ *buf_rtn = NULL;
+ return -1;
+ }
+ }
+ if (FD_ISSET (g->sock, &rset2)) {
+ if (nr < 0) { /* Have we read the message length word yet? */
+ r = read (g->sock, lenbuf+nr+4, -nr);
+ if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+ int err = errno;
+ perrorf (g, "read");
+ /* Under some circumstances we see "Connection reset by peer"
+ * here when the child dies suddenly. Catch this and call
+ * the cleanup function, same as for EOF.
+ */
+ if (err == ECONNRESET)
+ child_cleanup (g);
+ return -1;
+ }
+ if (r == 0) {
+ error (g, _("unexpected end of file when reading from daemon"));
+ child_cleanup (g);
+ return -1;
+ }
+ nr += r;
+
+ if (nr < 0) /* Still not got the whole length word. */
+ continue;
+
+ XDR xdr;
+ xdrmem_create (&xdr, lenbuf, 4, XDR_DECODE);
+ xdr_uint32_t (&xdr, size_rtn);
+ xdr_destroy (&xdr);
+
+ if (*size_rtn == GUESTFS_LAUNCH_FLAG) {
+ if (g->state != LAUNCHING)
+ error (g, _("received magic signature from guestfsd, but in state %d"),
+ g->state);
+ else {
+ g->state = READY;
+ if (g->launch_done_cb)
+ g->launch_done_cb (g, g->launch_done_cb_data);
+ }
+ return 0;
+ }
+ else if (*size_rtn == GUESTFS_CANCEL_FLAG)
+ return 0;
+ /* If this happens, it's pretty bad and we've probably lost
+ * synchronization.
+ */
+ else if (*size_rtn > GUESTFS_MESSAGE_MAX) {
+ error (g, _("message length (%u) > maximum possible size (%d)"),
+ (unsigned) *size_rtn, GUESTFS_MESSAGE_MAX);
+ return -1;
+ }
+
+ /* Allocate the complete buffer, size now known. */
+ *buf_rtn = safe_malloc (g, *size_rtn);
+ /*FALLTHROUGH*/
+ }
+
+ size_t sizetoread = *size_rtn - nr;
+ if (sizetoread > BUFSIZ) sizetoread = BUFSIZ;
+
+ r = read (g->sock, (char *) (*buf_rtn) + nr, sizetoread);
+ if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+ perrorf (g, "read");
+ free (*buf_rtn);
+ *buf_rtn = NULL;
+ return -1;
+ }
+ if (r == 0) {
+ error (g, _("unexpected end of file when reading from daemon"));
+ child_cleanup (g);
+ free (*buf_rtn);
+ *buf_rtn = NULL;
+ return -1;
+ }
+ nr += r;
+ }
+ }
+
+ /* Got the full message, caller can start processing it. */
+#ifdef ENABLE_PACKET_DUMP
+ if (g->verbose) {
+ ssize_t i, j;
+
+ for (i = 0; i < nr; i += 16) {
+ printf ("%04zx: ", i);
+ for (j = i; j < MIN (i+16, nr); ++j)
+ printf ("%02x ", (*(unsigned char **)buf_rtn)[j]);
+ for (; j < i+16; ++j)
+ printf (" ");
+ printf ("|");
+ for (j = i; j < MIN (i+16, nr); ++j)
+ if (c_isprint ((*(char **)buf_rtn)[j]))
+ printf ("%c", (*(char **)buf_rtn)[j]);
+ else
+ printf (".");
+ for (; j < i+16; ++j)
+ printf (" ");
+ printf ("|\n");
+ }
+ }
+#endif
+
+ return 0;
+}
+
+/* This is very much like recv_from_daemon above, but g->sock is
+ * a listening socket and we are accepting a new connection on
+ * that socket instead of reading anything. Returns the newly
+ * accepted socket.
+ */
+int
+guestfs__accept_from_daemon (guestfs_h *g)
+{
+ fd_set rset, rset2;
+
+ if (g->verbose)
+ fprintf (stderr,
+ "accept_from_daemon: %p g->state = %d\n", g, g->state);
+
+ FD_ZERO (&rset);
+
+ FD_SET (g->fd[1], &rset); /* Read qemu stdout for log messages & EOF. */
+ FD_SET (g->sock, &rset); /* Read socket for accept. */
+
+ int max_fd = MAX (g->sock, g->fd[1]);
+ int sock = -1;
+
+ while (sock == -1) {
+ /* If the qemu process has died, clean up the zombie (RHBZ#579155).
+ * By partially polling in the select below we ensure that this
+ * function will be called eventually.
+ */
+ waitpid (g->pid, NULL, WNOHANG);
+
+ rset2 = rset;
+
+ struct timeval tv = { .tv_sec = 1, .tv_usec = 0 };
+ int r = select (max_fd+1, &rset2, NULL, NULL, &tv);
+ if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+ perrorf (g, "select");
+ return -1;
+ }
+
+ if (FD_ISSET (g->fd[1], &rset2)) {
+ if (read_log_message_or_eof (g, g->fd[1], 1) == -1)
+ return -1;
+ }
+ if (FD_ISSET (g->sock, &rset2)) {
+ sock = accept (g->sock, NULL, NULL);
+ if (sock == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+ perrorf (g, "accept");
+ return -1;
+ }
+ }
+ }
+
+ return sock;
+}
+
+int
+guestfs___send (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
+{
+ struct guestfs_message_header hdr;
+ XDR xdr;
+ u_int32_t len;
+ int serial = g->msg_next_serial++;
+ int r;
+ char *msg_out;
+ size_t msg_out_size;
+
+ if (g->state != BUSY) {
+ error (g, _("guestfs___send: state %d != BUSY"), g->state);
+ return -1;
+ }
+
+ /* We have to allocate this message buffer on the heap because
+ * it is quite large (although will be mostly unused). We
+ * can't allocate it on the stack because in some environments
+ * we have quite limited stack space available, notably when
+ * running in the JVM.
+ */
+ msg_out = safe_malloc (g, GUESTFS_MESSAGE_MAX + 4);
+ xdrmem_create (&xdr, msg_out + 4, GUESTFS_MESSAGE_MAX, XDR_ENCODE);
+
+ /* Serialize the header. */
+ hdr.prog = GUESTFS_PROGRAM;
+ hdr.vers = GUESTFS_PROTOCOL_VERSION;
+ hdr.proc = proc_nr;
+ hdr.direction = GUESTFS_DIRECTION_CALL;
+ hdr.serial = serial;
+ hdr.status = GUESTFS_STATUS_OK;
+
+ if (!xdr_guestfs_message_header (&xdr, &hdr)) {
+ error (g, _("xdr_guestfs_message_header failed"));
+ goto cleanup1;
+ }
+
+ /* Serialize the args. If any, because some message types
+ * have no parameters.
+ */
+ if (xdrp) {
+ if (!(*xdrp) (&xdr, args)) {
+ error (g, _("dispatch failed to marshal args"));
+ goto cleanup1;
+ }
+ }
+
+ /* Get the actual length of the message, resize the buffer to match
+ * the actual length, and write the length word at the beginning.
+ */
+ len = xdr_getpos (&xdr);
+ xdr_destroy (&xdr);
+
+ msg_out = safe_realloc (g, msg_out, len + 4);
+ msg_out_size = len + 4;
+
+ xdrmem_create (&xdr, msg_out, 4, XDR_ENCODE);
+ xdr_uint32_t (&xdr, &len);
+
+ again:
+ r = guestfs__send_to_daemon (g, msg_out, msg_out_size);
+ if (r == -2) /* Ignore stray daemon cancellations. */
+ goto again;
+ if (r == -1)
+ goto cleanup1;
+ free (msg_out);
+
+ return serial;
+
+ cleanup1:
+ free (msg_out);
+ return -1;
+}
+
+static int cancel = 0; /* XXX Implement file cancellation. */
+static int send_file_chunk (guestfs_h *g, int cancel, const char *buf, size_t len);
+static int send_file_data (guestfs_h *g, const char *buf, size_t len);
+static int send_file_cancellation (guestfs_h *g);
+static int send_file_complete (guestfs_h *g);
+
+/* Send a file.
+ * Returns:
+ * 0 OK
+ * -1 error
+ * -2 daemon cancelled (we must read the error message)
+ */
+int
+guestfs___send_file (guestfs_h *g, const char *filename)
+{
+ char buf[GUESTFS_MAX_CHUNK_SIZE];
+ int fd, r, err;
+
+ fd = open (filename, O_RDONLY);
+ if (fd == -1) {
+ perrorf (g, "open: %s", filename);
+ send_file_cancellation (g);
+ /* Daemon sees cancellation and won't reply, so caller can
+ * just return here.
+ */
+ return -1;
+ }
+
+ /* Send file in chunked encoding. */
+ while (!cancel) {
+ r = read (fd, buf, sizeof buf);
+ if (r == -1 && (errno == EINTR || errno == EAGAIN))
+ continue;
+ if (r <= 0) break;
+ err = send_file_data (g, buf, r);
+ if (err < 0) {
+ if (err == -2) /* daemon sent cancellation */
+ send_file_cancellation (g);
+ return err;
+ }
+ }
+
+ if (cancel) { /* cancel from either end */
+ send_file_cancellation (g);
+ return -1;
+ }
+
+ if (r == -1) {
+ perrorf (g, "read: %s", filename);
+ send_file_cancellation (g);
+ return -1;
+ }
+
+ /* End of file, but before we send that, we need to close
+ * the file and check for errors.
+ */
+ if (close (fd) == -1) {
+ perrorf (g, "close: %s", filename);
+ send_file_cancellation (g);
+ return -1;
+ }
+
+ return send_file_complete (g);
+}
+
+/* Send a chunk of file data. */
+static int
+send_file_data (guestfs_h *g, const char *buf, size_t len)
+{
+ return send_file_chunk (g, 0, buf, len);
+}
+
+/* Send a cancellation message. */
+static int
+send_file_cancellation (guestfs_h *g)
+{
+ return send_file_chunk (g, 1, NULL, 0);
+}
+
+/* Send a file complete chunk. */
+static int
+send_file_complete (guestfs_h *g)
+{
+ char buf[1];
+ return send_file_chunk (g, 0, buf, 0);
+}
+
+static int
+send_file_chunk (guestfs_h *g, int cancel, const char *buf, size_t buflen)
+{
+ u_int32_t len;
+ int r;
+ guestfs_chunk chunk;
+ XDR xdr;
+ char *msg_out;
+ size_t msg_out_size;
+
+ if (g->state != BUSY) {
+ error (g, _("send_file_chunk: state %d != READY"), g->state);
+ return -1;
+ }
+
+ /* Allocate the chunk buffer. Don't use the stack to avoid
+ * excessive stack usage and unnecessary copies.
+ */
+ msg_out = safe_malloc (g, GUESTFS_MAX_CHUNK_SIZE + 4 + 48);
+ xdrmem_create (&xdr, msg_out + 4, GUESTFS_MAX_CHUNK_SIZE + 48, XDR_ENCODE);
+
+ /* Serialize the chunk. */
+ chunk.cancel = cancel;
+ chunk.data.data_len = buflen;
+ chunk.data.data_val = (char *) buf;
+
+ if (!xdr_guestfs_chunk (&xdr, &chunk)) {
+ error (g, _("xdr_guestfs_chunk failed (buf = %p, buflen = %zu)"),
+ buf, buflen);
+ xdr_destroy (&xdr);
+ goto cleanup1;
+ }
+
+ len = xdr_getpos (&xdr);
+ xdr_destroy (&xdr);
+
+ /* Reduce the size of the outgoing message buffer to the real length. */
+ msg_out = safe_realloc (g, msg_out, len + 4);
+ msg_out_size = len + 4;
+
+ xdrmem_create (&xdr, msg_out, 4, XDR_ENCODE);
+ xdr_uint32_t (&xdr, &len);
+
+ r = guestfs__send_to_daemon (g, msg_out, msg_out_size);
+
+ /* Did the daemon send a cancellation message? */
+ if (r == -2) {
+ if (g->verbose)
+ fprintf (stderr, "got daemon cancellation\n");
+ return -2;
+ }
+
+ if (r == -1)
+ goto cleanup1;
+
+ free (msg_out);
+
+ return 0;
+
+ cleanup1:
+ free (msg_out);
+ return -1;
+}
+
+/* Receive a reply. */
+int
+guestfs___recv (guestfs_h *g, const char *fn,
+ guestfs_message_header *hdr,
+ guestfs_message_error *err,
+ xdrproc_t xdrp, char *ret)
+{
+ XDR xdr;
+ void *buf;
+ uint32_t size;
+ int r;
+
+ again:
+ r = guestfs__recv_from_daemon (g, &size, &buf);
+ if (r == -1)
+ return -1;
+
+ /* This can happen if a cancellation happens right at the end
+ * of us sending a FileIn parameter to the daemon. Discard. The
+ * daemon should send us an error message next.
+ */
+ if (size == GUESTFS_CANCEL_FLAG)
+ goto again;
+
+ if (size == GUESTFS_LAUNCH_FLAG) {
+ error (g, "%s: received unexpected launch flag from daemon when expecting reply", fn);
+ return -1;
+ }
+
+ xdrmem_create (&xdr, buf, size, XDR_DECODE);
+
+ if (!xdr_guestfs_message_header (&xdr, hdr)) {
+ error (g, "%s: failed to parse reply header", fn);
+ xdr_destroy (&xdr);
+ free (buf);
+ return -1;
+ }
+ if (hdr->status == GUESTFS_STATUS_ERROR) {
+ if (!xdr_guestfs_message_error (&xdr, err)) {
+ error (g, "%s: failed to parse reply error", fn);
+ xdr_destroy (&xdr);
+ free (buf);
+ return -1;
+ }
+ } else {
+ if (xdrp && ret && !xdrp (&xdr, ret)) {
+ error (g, "%s: failed to parse reply", fn);
+ xdr_destroy (&xdr);
+ free (buf);
+ return -1;
+ }
+ }
+ xdr_destroy (&xdr);
+ free (buf);
+
+ return 0;
+}
+
+/* Receive a file. */
+
+/* Returns -1 = error, 0 = EOF, > 0 = more data */
+static ssize_t receive_file_data (guestfs_h *g, void **buf);
+
+int
+guestfs___recv_file (guestfs_h *g, const char *filename)
+{
+ void *buf;
+ int fd, r;
+
+ fd = open (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0666);
+ if (fd == -1) {
+ perrorf (g, "open: %s", filename);
+ goto cancel;
+ }
+
+ /* Receive the file in chunked encoding. */
+ while ((r = receive_file_data (g, &buf)) > 0) {
+ if (xwrite (fd, buf, r) == -1) {
+ perrorf (g, "%s: write", filename);
+ free (buf);
+ goto cancel;
+ }
+ free (buf);
+ }
+
+ if (r == -1) {
+ error (g, _("%s: error in chunked encoding"), filename);
+ return -1;
+ }
+
+ if (close (fd) == -1) {
+ perrorf (g, "close: %s", filename);
+ return -1;
+ }
+
+ return 0;
+
+ cancel: ;
+ /* Send cancellation message to daemon, then wait until it
+ * cancels (just throwing away data).
+ */
+ XDR xdr;
+ char fbuf[4];
+ uint32_t flag = GUESTFS_CANCEL_FLAG;
+
+ if (g->verbose)
+ fprintf (stderr, "%s: waiting for daemon to acknowledge cancellation\n",
+ __func__);
+
+ xdrmem_create (&xdr, fbuf, sizeof fbuf, XDR_ENCODE);
+ xdr_uint32_t (&xdr, &flag);
+ xdr_destroy (&xdr);
+
+ if (xwrite (g->sock, fbuf, sizeof fbuf) == -1) {
+ perrorf (g, _("write to daemon socket"));
+ return -1;
+ }
+
+ while (receive_file_data (g, NULL) > 0)
+ ; /* just discard it */
+
+ return -1;
+}
+
+/* Receive a chunk of file data. */
+/* Returns -1 = error, 0 = EOF, > 0 = more data */
+static ssize_t
+receive_file_data (guestfs_h *g, void **buf_r)
+{
+ int r;
+ void *buf;
+ uint32_t len;
+ XDR xdr;
+ guestfs_chunk chunk;
+
+ r = guestfs__recv_from_daemon (g, &len, &buf);
+ if (r == -1) {
+ error (g, _("receive_file_data: parse error in reply callback"));
+ return -1;
+ }
+
+ if (len == GUESTFS_LAUNCH_FLAG || len == GUESTFS_CANCEL_FLAG) {
+ error (g, _("receive_file_data: unexpected flag received when reading file chunks"));
+ return -1;
+ }
+
+ memset (&chunk, 0, sizeof chunk);
+
+ xdrmem_create (&xdr, buf, len, XDR_DECODE);
+ if (!xdr_guestfs_chunk (&xdr, &chunk)) {
+ error (g, _("failed to parse file chunk"));
+ free (buf);
+ return -1;
+ }
+ xdr_destroy (&xdr);
+ /* After decoding, the original buffer is no longer used. */
+ free (buf);
+
+ if (chunk.cancel) {
+ error (g, _("file receive cancelled by daemon"));
+ free (chunk.data.data_val);
+ return -1;
+ }
+
+ if (chunk.data.data_len == 0) { /* end of transfer */
+ free (chunk.data.data_val);
+ return 0;
+ }
+
+ if (buf_r) *buf_r = chunk.data.data_val;
+ else free (chunk.data.data_val); /* else caller frees */
+
+ return chunk.data.data_len;
+}
git.annexia.org / libguestfs.git / commitdiff