#include <sys/stat.h>
#include <sys/select.h>
#include <dirent.h>
+#include <signal.h>
+#include <assert.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include "c-ctype.h"
#include "glthread/lock.h"
+#include "hash.h"
+#include "hash-pjw.h"
#include "ignore-value.h"
#include "guestfs.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
-
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);
-#define UNIX_PATH_MAX 108
-
-/* Also in guestfsd.c */
-#define GUESTFWD_ADDR "10.0.2.4"
-#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;
-
- int msg_next_serial;
-};
-
gl_lock_define_initialized (static, handles_lock);
static guestfs_h *handles = NULL;
static int atexit_handler_set = 0;
if (g->verbose)
fprintf (stderr, "closing guestfs handle %p (state %d)\n", g, g->state);
+ /* Run user close callback before anything else. */
+ if (g->close_cb)
+ g->close_cb (g, g->close_cb_data);
+
+ guestfs___free_inspect_info (g);
+
/* Try to sync if autosync flag is set. */
if (g->autosync && g->state == READY) {
guestfs_umount_all (g);
snprintf (filename, sizeof filename, "%s/sock", g->tmpdir);
unlink (filename);
- snprintf (filename, sizeof filename, "%s/initrd", g->tmpdir);
- unlink (filename);
-
- snprintf (filename, sizeof filename, "%s/kernel", g->tmpdir);
- unlink (filename);
-
rmdir (g->tmpdir);
free (g->tmpdir);
}
gl_lock_unlock (handles_lock);
+ if (g->pda)
+ hash_free (g->pda);
free (g->last_error);
free (g->path);
free (g->qemu);
if (err < 0) return;
-#ifndef _GNU_SOURCE
+#if !defined(_GNU_SOURCE) || defined(__APPLE__)
char buf[256];
strerror_r (errnum, buf, sizeof buf);
#else
/* Technically we should add an autoconf test for this, testing for the desired
functionality, like what's done in gnulib, but for now, this is fine. */
+#if defined(__GLIBC__)
#define HAVE_GNU_CALLOC (__GLIBC__ >= 2)
+#else
+#define HAVE_GNU_CALLOC 0
+#endif
/* Allocate zeroed memory for N elements of S bytes, with error
checking. S must be nonzero. */
return s;
}
+char *
+guestfs_safe_strndup (guestfs_h *g, const char *str, size_t n)
+{
+ char *s = strndup (str, n);
+ if (!s) g->abort_cb ();
+ return s;
+}
+
void *
guestfs_safe_memdup (guestfs_h *g, void *ptr, size_t size)
{
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)
+int
+guestfs__set_network (guestfs_h *g, int v)
{
- 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);
+ g->enable_network = !!v;
return 0;
}
int
-guestfs__config (guestfs_h *g,
- const char *qemu_param, const char *qemu_value)
+guestfs__get_network (guestfs_h *g)
{
- 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;
+ return g->enable_network;
}
-int
-guestfs__add_drive (guestfs_h *g, const char *filename)
+void
+guestfs_set_log_message_callback (guestfs_h *g,
+ guestfs_log_message_cb cb, void *opaque)
{
- 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=" DRIVE_IF, filename);
- } else {
- fd = open (filename, O_RDONLY);
- if (fd >= 0) {
- close (fd);
- snprintf (buf, len, "file=%s,if=" DRIVE_IF, filename);
- } else {
- perrorf (g, "%s", filename);
- return -1;
- }
- }
-
- return guestfs__config (g, "-drive", buf);
+ g->log_message_cb = cb;
+ g->log_message_cb_data = opaque;
}
-int
-guestfs__add_drive_ro (guestfs_h *g, const char *filename)
+void
+guestfs_set_subprocess_quit_callback (guestfs_h *g,
+ guestfs_subprocess_quit_cb cb, void *opaque)
{
- size_t len = strlen (filename) + 64;
- char buf[len];
-
- 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;
- }
-
- snprintf (buf, len, "file=%s,snapshot=on,if=%s", filename, DRIVE_IF);
-
- return guestfs__config (g, "-drive", buf);
+ g->subprocess_quit_cb = cb;
+ g->subprocess_quit_cb_data = opaque;
}
-int
-guestfs__add_cdrom (guestfs_h *g, const char *filename)
+void
+guestfs_set_launch_done_callback (guestfs_h *g,
+ guestfs_launch_done_cb cb, void *opaque)
{
- 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);
+ g->launch_done_cb = cb;
+ g->launch_done_cb_data = opaque;
}
-/* Returns true iff file is contained in dir. */
-static int
-dir_contains_file (const char *dir, const char *file)
+void
+guestfs_set_close_callback (guestfs_h *g,
+ guestfs_close_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->close_cb = cb;
+ g->close_cb_data = opaque;
}
-/* Returns true iff every listed file is contained in 'dir'. */
-static int
-dir_contains_files (const char *dir, ...)
+void
+guestfs_set_progress_callback (guestfs_h *g,
+ guestfs_progress_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->progress_cb = cb;
+ g->progress_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 test_qemu (guestfs_h *g);
-static int qemu_supports (guestfs_h *g, const char *option);
-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";
-static const char *supermin_name =
- "initramfs." REPO "." host_cpu ".supermin.img";
-static const char *supermin_hostfiles_name =
- "initramfs." REPO "." host_cpu ".supermin.hostfiles";
+/* Note the private data area is allocated lazily, since the vast
+ * majority of callers will never use it. This means g->pda is
+ * likely to be NULL.
+ */
+struct pda_entry {
+ char *key; /* key */
+ void *data; /* opaque user data pointer */
+};
-int
-guestfs__launch (guestfs_h *g)
+static size_t
+hasher (void const *x, size_t table_size)
{
- 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;
-
- /* Start the clock ... */
- gettimeofday (&g->launch_t, NULL);
-
-#ifdef P_tmpdir
- tmpdir = P_tmpdir;
-#else
- tmpdir = "/tmp";
-#endif
-
- tmpdir = getenv ("TMPDIR") ? : tmpdir;
- snprintf (dir_template, sizeof dir_template, "%s/libguestfsXXXXXX", tmpdir);
-
- /* Configured? */
- if (!g->cmdline) {
- error (g, _("you must call guestfs_add_drive before guestfs_launch"));
- return -1;
- }
-
- if (g->state != CONFIG) {
- error (g, _("qemu has already been launched"));
- return -1;
- }
-
- /* Make the temporary directory. */
- 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;
- }
- }
-
- /* 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_name, supermin_hostfiles_name,
- "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_name, supermin_hostfiles_name,
- "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 (test_qemu (g) == -1)
- goto cleanup0;
-
- /* Choose which vmchannel implementation to use. */
- if (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=10.0.2.0/8");
-
- snprintf (buf, sizeof buf,
- "guestfs_vmchannel=tcp:10.0.2.2:%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=10.0.2.0/8,"
- "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=10.0.2.0/8");
-
- 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) */
- "%s", /* (append) */
- g->selinux ? "selinux=1 enforcing=0" : "selinux=0",
- vmchannel ? vmchannel : "",
- g->verbose ? "guestfs_verbose=1" : "",
- 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 (1);
- }
- 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 (1);
- }
-
- /* 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 (0);
- if (kill (parent_pid, 0) == -1) {
- /* Parent's gone away, qemu still around, so kill qemu. */
- kill (qemu_pid, 9);
- _exit (0);
- }
- 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);
- 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]);
- }
- 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);
+ struct pda_entry const *p = x;
+ return hash_pjw (p->key, table_size);
+}
- cleanup0:
- if (g->sock >= 0) {
- close (g->sock);
- g->sock = -1;
- }
- g->state = CONFIG;
- free (kernel);
- free (initrd);
- return -1;
+static bool
+comparator (void const *x, void const *y)
+{
+ struct pda_entry const *a = x;
+ struct pda_entry const *b = y;
+ return STREQ (a->key, b->key);
}
-/* 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)
+freer (void *x)
{
- 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++;
+ if (x) {
+ struct pda_entry *p = x;
+ free (p->key);
+ free (p);
}
-
- 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)
+void
+guestfs_set_private (guestfs_h *g, const char *key, void *data)
{
- 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);
-
- snprintf (cmd, sizeof cmd,
- "PATH='%s':$PATH "
- "libguestfs-supermin-helper '%s' " host_cpu " " REPO " %s %s",
- 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->pda == NULL) {
+ g->pda = hash_initialize (16, NULL, hasher, comparator, freer);
+ if (g->pda == NULL)
+ g->abort_cb ();
}
- if (g->verbose)
- print_timestamped_message (g, "finished building supermin appliance");
-
- return 0;
-}
+ struct pda_entry *new_entry = safe_malloc (g, sizeof *new_entry);
+ new_entry->key = safe_strdup (g, key);
+ new_entry->data = data;
-/* 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;
+ struct pda_entry *old_entry = hash_delete (g->pda, new_entry);
+ freer (old_entry);
- msec = (y->tv_sec - x->tv_sec) * 1000;
- msec += (y->tv_usec - x->tv_usec) / 1000;
- return msec;
+ struct pda_entry *entry = hash_insert (g->pda, new_entry);
+ if (entry == NULL)
+ g->abort_cb ();
+ assert (entry == new_entry);
}
-static void
-print_timestamped_message (guestfs_h *g, const char *fs, ...)
+static inline char *
+bad_cast (char const *s)
{
- va_list args;
- char *msg;
- int err;
- struct timeval tv, diff;
-
- 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);
+ return (char *) s;
}
-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;
-
- free (g->qemu_help);
- free (g->qemu_version);
- g->qemu_help = NULL;
- g->qemu_version = NULL;
-
- snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -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' -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).
- */
-static int
-qemu_supports (guestfs_h *g, const char *option)
-{
- return g->qemu_help && 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)
-{
- 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;
-}
-
-/* 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);
-
- 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;
-}
-
-/*----------------------------------------------------------------------*/
-
-/* 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/guestfs-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);
-
- /*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)
-{
- 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);
- 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]) == -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]) == -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) {
- rset2 = rset;
- int r = select (max_fd+1, &rset2, NULL, 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]) == -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;
- size_t len;
-
- 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)
+void *
+guestfs_get_private (guestfs_h *g, const char *key)
{
- 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 */
+ if (g->pda == NULL)
+ return NULL; /* no keys have been set */
- return chunk.data.data_len;
+ const struct pda_entry k = { .key = bad_cast (key) };
+ struct pda_entry *entry = hash_lookup (g->pda, &k);
+ if (entry)
+ return entry->data;
+ else
+ return NULL;
}
git.annexia.org / libguestfs.git / blobdiff