/* libguestfs
- * Copyright (C) 2009 Red Hat Inc.
+ * Copyright (C) 2009 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
#include <config.h>
#define _BSD_SOURCE /* for mkdtemp, usleep */
-#define _GNU_SOURCE /* for vasprintf, GNU strerror_r, strchrnul */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
+#include <stddef.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#endif
#include "guestfs.h"
+#include "guestfs-internal-actions.h"
#include "guestfs_protocol.h"
+#include "ignore-value.h"
#ifdef HAVE_GETTEXT
#include "gettext.h"
#define _(str) dgettext(PACKAGE, (str))
-#define N_(str) dgettext(PACKAGE, (str))
+//#define N_(str) dgettext(PACKAGE, (str))
#else
#define _(str) str
-#define N_(str) str
+//#define N_(str) str
#endif
#define error guestfs_error
#define safe_malloc guestfs_safe_malloc
#define safe_realloc guestfs_safe_realloc
#define safe_strdup guestfs_safe_strdup
-#define safe_memdup guestfs_safe_memdup
+//#define safe_memdup guestfs_safe_memdup
static void default_error_cb (guestfs_h *g, void *data, const char *msg);
-static void stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
-static void sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
-static void sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
-
+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 void close_handles (void);
-static int select_add_handle (guestfs_main_loop *ml, guestfs_h *g, int fd, int events, guestfs_handle_event_cb cb, void *data);
-static int select_remove_handle (guestfs_main_loop *ml, guestfs_h *g, int watch);
-static int select_add_timeout (guestfs_main_loop *ml, guestfs_h *g, int interval, guestfs_handle_timeout_cb cb, void *data);
-static int select_remove_timeout (guestfs_main_loop *ml, guestfs_h *g, int timer);
-static int select_main_loop_run (guestfs_main_loop *ml, guestfs_h *g);
-static int select_main_loop_quit (guestfs_main_loop *ml, guestfs_h *g);
-
-/* Default select-based main loop. */
-struct select_handle_cb_data {
- guestfs_handle_event_cb cb;
- guestfs_h *g;
- void *data;
-};
-
-struct select_main_loop {
- /* NB. These fields must be the same as in struct guestfs_main_loop: */
- guestfs_add_handle_cb add_handle;
- guestfs_remove_handle_cb remove_handle;
- guestfs_add_timeout_cb add_timeout;
- guestfs_remove_timeout_cb remove_timeout;
- guestfs_main_loop_run_cb main_loop_run;
- guestfs_main_loop_quit_cb main_loop_quit;
-
- /* Additional private data: */
- int is_running;
-
- fd_set rset;
- fd_set wset;
- fd_set xset;
-
- int max_fd;
- int nr_fds;
- struct select_handle_cb_data *handle_cb_data;
-};
-
-/* Default main loop. */
-static struct select_main_loop default_main_loop = {
- .add_handle = select_add_handle,
- .remove_handle = select_remove_handle,
- .add_timeout = select_add_timeout,
- .remove_timeout = select_remove_timeout,
- .main_loop_run = select_main_loop_run,
- .main_loop_quit = select_main_loop_quit,
-
- /* XXX hopefully .rset, .wset, .xset are initialized to the empty
- * set by the normal action of everything being initialized to zero.
- */
- .is_running = 0,
- .max_fd = -1,
- .nr_fds = 0,
- .handle_cb_data = NULL,
-};
-
#define UNIX_PATH_MAX 108
/* Also in guestfsd.c */
-#define VMCHANNEL_PORT 6666
-#define VMCHANNEL_ADDR "10.0.2.4"
+#define GUESTFWD_PORT 6666
+//#define GUESTFWD_ADDR "10.0.2.4"
/* GuestFS handle and connection. */
enum state { CONFIG, LAUNCHING, READY, BUSY, NO_HANDLE };
pid_t recoverypid; /* Recovery process PID. */
time_t start_t; /* The time when we started qemu. */
- int stdout_watch; /* Watches qemu stdout for log messages. */
- int sock_watch; /* Watches daemon comm socket. */
-
char *tmpdir; /* Temporary directory containing socket. */
char *qemu_help, *qemu_version; /* Output of qemu -help, qemu -version. */
int cmdline_size;
int verbose;
+ int trace;
int autosync;
char *path; /* Path to kernel, initrd. */
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_send_cb send_cb;
- void * send_cb_data;
- guestfs_reply_cb reply_cb;
- void * reply_cb_data;
guestfs_log_message_cb log_message_cb;
void * log_message_cb_data;
guestfs_subprocess_quit_cb subprocess_quit_cb;
guestfs_launch_done_cb launch_done_cb;
void * launch_done_cb_data;
- /* Main loop used by this handle. */
- guestfs_main_loop *main_loop;
-
- /* Messages sent and received from the daemon. */
- char *msg_in;
- int msg_in_size, msg_in_allocated;
- char *msg_out;
- int msg_out_size, msg_out_pos;
-
int msg_next_serial;
};
g->fd[0] = -1;
g->fd[1] = -1;
g->sock = -1;
- g->stdout_watch = -1;
- g->sock_watch = -1;
g->abort_cb = abort;
g->error_cb = default_error_cb;
str = getenv ("LIBGUESTFS_DEBUG");
g->verbose = str != NULL && strcmp (str, "1") == 0;
+ str = getenv ("LIBGUESTFS_TRACE");
+ g->trace = str != NULL && strcmp (str, "1") == 0;
+
str = getenv ("LIBGUESTFS_PATH");
g->path = str != NULL ? strdup (str) : strdup (GUESTFS_DEFAULT_PATH);
if (!g->path) goto error;
} else
g->memsize = 500;
- g->main_loop = guestfs_get_default_main_loop ();
-
/* Start with large serial numbers so they are easy to spot
* inside the protocol.
*/
if (g->state != CONFIG)
guestfs_kill_subprocess (g);
+ /* Close sockets. */
+ if (g->fd[0] >= 0)
+ close (g->fd[0]);
+ if (g->fd[1] >= 0)
+ close (g->fd[1]);
+ if (g->sock >= 0)
+ close (g->sock);
+ g->fd[0] = -1;
+ g->fd[1] = -1;
+ g->sock = -1;
+
+ /* Wait for subprocess(es) to exit. */
+ waitpid (g->pid, NULL, 0);
+ if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
+
+ /* Remove tmpfiles. */
if (g->tmpdir) {
snprintf (filename, sizeof filename, "%s/sock", g->tmpdir);
unlink (filename);
}
/* release mutex (XXX) */
- free (g->msg_in);
- free (g->msg_out);
free (g->last_error);
free (g->path);
free (g->qemu);
{
va_list args;
char *msg;
- int err = errno;
+ int errnum = errno;
va_start (args, fs);
- vasprintf (&msg, fs, args);
+ int err = vasprintf (&msg, fs, args);
va_end (args);
+ if (err < 0) return;
+
#ifndef _GNU_SOURCE
char buf[256];
- strerror_r (err, buf, sizeof buf);
+ strerror_r (errnum, buf, sizeof buf);
#else
char _buf[256];
char *buf;
- buf = strerror_r (err, _buf, sizeof _buf);
+ buf = strerror_r (errnum, _buf, sizeof _buf);
#endif
msg = safe_realloc (g, msg, strlen (msg) + 2 + strlen (buf) + 1);
return ptr;
}
+/* Return 1 if an array of N objects, each of size S, cannot exist due
+ to size arithmetic overflow. S must be positive and N must be
+ nonnegative. This is a macro, not an inline function, so that it
+ works correctly even when SIZE_MAX < N.
+
+ By gnulib convention, SIZE_MAX represents overflow in size
+ calculations, so the conservative dividend to use here is
+ SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
+ However, malloc (SIZE_MAX) fails on all known hosts where
+ sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
+ exactly-SIZE_MAX allocations on such hosts; this avoids a test and
+ branch when S is known to be 1. */
+# define xalloc_oversized(n, s) \
+ ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
+
+/* 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. */
+#define HAVE_GNU_CALLOC (__GLIBC__ >= 2)
+
+/* Allocate zeroed memory for N elements of S bytes, with error
+ checking. S must be nonzero. */
+void *
+guestfs_safe_calloc (guestfs_h *g, size_t n, size_t s)
+{
+ /* From gnulib's calloc function in xmalloc.c. */
+ void *p;
+ /* Test for overflow, since some calloc implementations don't have
+ proper overflow checks. But omit overflow and size-zero tests if
+ HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
+ returns NULL if successful. */
+ if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s))
+ || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
+ g->abort_cb ();
+ return p;
+}
+
void *
guestfs_safe_realloc (guestfs_h *g, void *ptr, int nbytes)
{
}
static int
-xwrite (int fd, const void *buf, size_t len)
+xwrite (int fd, const void *v_buf, size_t len)
{
+ const char *buf = v_buf;
int r;
while (len > 0) {
return 0;
}
-static int
-xread (int fd, void *buf, size_t len)
-{
- int r;
-
- while (len > 0) {
- r = read (fd, buf, len);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- return -1;
- }
-
- buf += r;
- len -= r;
- }
-
- return 0;
-}
-
void
guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
{
}
int
-guestfs_set_verbose (guestfs_h *g, int v)
+guestfs__set_verbose (guestfs_h *g, int v)
{
g->verbose = !!v;
return 0;
}
int
-guestfs_get_verbose (guestfs_h *g)
+guestfs__get_verbose (guestfs_h *g)
{
return g->verbose;
}
int
-guestfs_set_autosync (guestfs_h *g, int a)
+guestfs__set_autosync (guestfs_h *g, int a)
{
g->autosync = !!a;
return 0;
}
int
-guestfs_get_autosync (guestfs_h *g)
+guestfs__get_autosync (guestfs_h *g)
{
return g->autosync;
}
int
-guestfs_set_path (guestfs_h *g, const char *path)
+guestfs__set_path (guestfs_h *g, const char *path)
{
free (g->path);
g->path = NULL;
}
const char *
-guestfs_get_path (guestfs_h *g)
+guestfs__get_path (guestfs_h *g)
{
return g->path;
}
int
-guestfs_set_qemu (guestfs_h *g, const char *qemu)
+guestfs__set_qemu (guestfs_h *g, const char *qemu)
{
free (g->qemu);
g->qemu = NULL;
}
const char *
-guestfs_get_qemu (guestfs_h *g)
+guestfs__get_qemu (guestfs_h *g)
{
return g->qemu;
}
int
-guestfs_set_append (guestfs_h *g, const char *append)
+guestfs__set_append (guestfs_h *g, const char *append)
{
free (g->append);
g->append = NULL;
}
const char *
-guestfs_get_append (guestfs_h *g)
+guestfs__get_append (guestfs_h *g)
{
return g->append;
}
int
-guestfs_set_memsize (guestfs_h *g, int memsize)
+guestfs__set_memsize (guestfs_h *g, int memsize)
{
g->memsize = memsize;
return 0;
}
int
-guestfs_get_memsize (guestfs_h *g)
+guestfs__get_memsize (guestfs_h *g)
{
return g->memsize;
}
+int
+guestfs__set_selinux (guestfs_h *g, int selinux)
+{
+ g->selinux = selinux;
+ return 0;
+}
+
+int
+guestfs__get_selinux (guestfs_h *g)
+{
+ return g->selinux;
+}
+
+int
+guestfs__get_pid (guestfs_h *g)
+{
+ if (g->pid > 0)
+ return g->pid;
+ else {
+ error (g, "get_pid: no qemu subprocess");
+ return -1;
+ }
+}
+
+struct guestfs_version *
+guestfs__version (guestfs_h *g)
+{
+ struct guestfs_version *r;
+
+ r = safe_malloc (g, sizeof *r);
+ r->major = PACKAGE_VERSION_MAJOR;
+ r->minor = PACKAGE_VERSION_MINOR;
+ r->release = PACKAGE_VERSION_RELEASE;
+ r->extra = safe_strdup (g, PACKAGE_VERSION_EXTRA);
+ return r;
+}
+
+int
+guestfs__set_trace (guestfs_h *g, int t)
+{
+ g->trace = !!t;
+ return 0;
+}
+
+int
+guestfs__get_trace (guestfs_h *g)
+{
+ return g->trace;
+}
+
/* Add a string to the current command line. */
static void
incr_cmdline_size (guestfs_h *g)
}
int
-guestfs_config (guestfs_h *g,
- const char *qemu_param, const char *qemu_value)
+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"));
}
int
-guestfs_add_drive (guestfs_h *g, const char *filename)
+guestfs__add_drive (guestfs_h *g, const char *filename)
{
size_t len = strlen (filename) + 64;
char buf[len];
return -1;
}
- if (access (filename, F_OK) == -1) {
- perrorf (g, "%s", filename);
- 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;
+ }
}
- /* cache=off improves reliability in the event of a host crash. */
- snprintf (buf, len, "file=%s,cache=off,if=%s", filename, DRIVE_IF);
-
- return guestfs_config (g, "-drive", buf);
+ return guestfs__config (g, "-drive", buf);
}
int
-guestfs_add_drive_ro (guestfs_h *g, const char *filename)
+guestfs__add_drive_ro (guestfs_h *g, const char *filename)
{
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);
+ return guestfs__config (g, "-drive", buf);
}
int
-guestfs_add_cdrom (guestfs_h *g, const char *filename)
+guestfs__add_cdrom (guestfs_h *g, const char *filename)
{
if (strchr (filename, ',') != NULL) {
error (g, _("filename cannot contain ',' (comma) character"));
return -1;
}
- return guestfs_config (g, "-cdrom", filename);
+ return guestfs__config (g, "-cdrom", filename);
}
/* Returns true iff file is contained in dir. */
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 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";
"initramfs." REPO "." host_cpu ".supermin.hostfiles";
int
-guestfs_launch (guestfs_h *g)
+guestfs__launch (guestfs_h *g)
{
- static const char *dir_template = "/tmp/libguestfsXXXXXX";
- int r, i, pmore;
+ const char *tmpdir;
+ char dir_template[PATH_MAX];
+ int r, pmore;
size_t len;
int wfd[2], rfd[2];
int tries;
char unixsock[256];
struct sockaddr_un addr;
+#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"));
/* Empty element of "." means cwd. */
if (len == 0 || (len == 1 && *pelem == '.')) {
if (g->verbose)
- fprintf (stderr,
- "looking for supermin appliance in current directory\n");
+ 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;
+ 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);
+ 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;
+ supermin_name, supermin_hostfiles_name,
+ "kmod.whitelist", NULL)) {
+ if (build_supermin_appliance (g, pelem, &kernel, &initrd) == -1)
+ return -1;
+ break;
}
}
/* 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;
- }
+ 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;
- }
+ 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;
if (kernel == NULL || initrd == NULL) {
error (g, _("cannot find %s or %s on LIBGUESTFS_PATH (current path = %s)"),
- kernel_name, initrd_name, g->path);
+ kernel_name, initrd_name, g->path);
goto cleanup0;
}
*/
g->cmdline[0] = g->qemu;
- /* Construct the -net channel parameter for qemu. */
- snprintf (vmchannel, sizeof vmchannel,
- "channel,%d:unix:%s,server,nowait",
- VMCHANNEL_PORT, unixsock);
+#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 */ \
+ "cgroup_disable=memory " /* saves us about 5 MB of RAM */
/* Linux kernel command line. */
snprintf (append, sizeof append,
- "panic=1 console=ttyS0 guestfs=%s:%d%s%s%s",
- VMCHANNEL_ADDR, VMCHANNEL_PORT,
- g->verbose ? " guestfs_verbose=1" : "",
- g->append ? " " : "", g->append ? g->append : "");
+ LINUX_CMDLINE
+ "%s" /* (selinux) */
+ "%s" /* (verbose) */
+ "%s", /* (append) */
+ g->selinux ? "selinux=1 enforcing=0 " : "selinux=0 ",
+ g->verbose ? "guestfs_verbose=1 " : " ",
+ g->append ? g->append : "");
snprintf (memsize_str, sizeof memsize_str, "%d", g->memsize);
add_cmdline (g, "-nographic");
add_cmdline (g, "-serial");
add_cmdline (g, "stdio");
+
+#if 0
+ /* Doesn't work. See:
+ * http://lists.gnu.org/archive/html/qemu-devel/2009-07/threads.html
+ * Subject "guestfwd option doesn't allow supplementary ,server,nowait"
+ */
+ if (qemu_supports (g, "guestfwd")) {
+ /* New-style -net user,guestfwd=... syntax for vmchannel. See:
+ * http://git.savannah.gnu.org/cgit/qemu.git/commit/?id=c92ef6a22d3c71538fcc48fb61ad353f7ba03b62
+ */
+ snprintf (vmchannel, sizeof vmchannel,
+ "user,vlan=0,net=10.0.2.0/8,guestfwd=tcp:%s:%d-unix:%s,server,nowait",
+ GUESTFWD_ADDR, GUESTFWD_PORT, unixsock);
+
+ add_cmdline (g, "-net");
+ add_cmdline (g, vmchannel);
+ } else {
+#endif
+ /* Not guestfwd. HOPEFULLY this qemu uses the older -net channel
+ * syntax, or if not then we'll get a quick failure.
+ */
+ snprintf (vmchannel, sizeof vmchannel,
+ "channel,%d:unix:%s,server,nowait",
+ GUESTFWD_PORT, unixsock);
+
+ add_cmdline (g, "-net");
+ add_cmdline (g, vmchannel);
+ add_cmdline (g, "-net");
+ add_cmdline (g, "user,vlan=0,net=10.0.2.0/8");
+#if 0
+ }
+#endif
add_cmdline (g, "-net");
- add_cmdline (g, vmchannel);
- add_cmdline (g, "-net");
- add_cmdline (g, "user,vlan=0");
- add_cmdline (g, "-net");
- add_cmdline (g, "nic,model=virtio,vlan=0");
+ add_cmdline (g, "nic,model=" NET_IF ",vlan=0");
/* These options recommended by KVM developers to improve reliability. */
if (qemu_supports (g, "-no-hpet"))
incr_cmdline_size (g);
g->cmdline[g->cmdline_size-1] = NULL;
- if (g->verbose) {
- fprintf (stderr, "%s", g->qemu);
- for (i = 0; g->cmdline[i]; ++i)
- fprintf (stderr, " %s", g->cmdline[i]);
- fprintf (stderr, "\n");
- }
+ if (g->verbose)
+ print_cmdline (g);
/* Set up stdin, stdout. */
close (0);
close (1);
close (wfd[1]);
close (rfd[0]);
- dup (wfd[0]);
- dup (rfd[1]);
+
+ 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]);
*/
for (;;) {
if (kill (qemu_pid, 0) == -1) /* qemu's gone away, we aren't needed */
- _exit (0);
+ _exit (0);
if (kill (parent_pid, 0) == -1) {
- /* Parent's gone away, qemu still around, so kill qemu. */
- kill (qemu_pid, 9);
- _exit (0);
+ /* Parent's gone away, qemu still around, so kill qemu. */
+ kill (qemu_pid, 9);
+ _exit (0);
}
sleep (2);
}
goto cleanup2;
connected:
- /* Watch the file descriptors. */
- free (g->msg_in);
- g->msg_in = NULL;
- g->msg_in_size = g->msg_in_allocated = 0;
-
- free (g->msg_out);
- g->msg_out = NULL;
- g->msg_out_size = 0;
- g->msg_out_pos = 0;
-
- g->stdout_watch =
- g->main_loop->add_handle (g->main_loop, g, g->fd[1],
- GUESTFS_HANDLE_READABLE,
- stdout_event, NULL);
- if (g->stdout_watch == -1) {
- error (g, _("could not watch qemu stdout"));
- goto cleanup3;
- }
-
- if (guestfs__switch_to_receiving (g) == -1)
- goto cleanup3;
-
g->state = LAUNCHING;
return 0;
- cleanup3:
- if (g->stdout_watch >= 0)
- g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
- if (g->sock_watch >= 0)
- g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
-
cleanup2:
close (g->sock);
g->pid = 0;
g->recoverypid = 0;
g->start_t = 0;
- g->stdout_watch = -1;
- g->sock_watch = -1;
cleanup0:
free (kernel);
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
*/
static int
build_supermin_appliance (guestfs_h *g, const char *path,
- char **kernel, char **initrd)
+ char **kernel, char **initrd)
{
char cmd[4096];
int r, len;
snprintf (*initrd, len+8, "%s/initrd", g->tmpdir);
snprintf (cmd, sizeof cmd,
- "PATH='%s':$PATH "
- "libguestfs-supermin-helper '%s' %s %s",
- path,
- path, *kernel, *initrd);
+ "PATH='%s':$PATH "
+ "libguestfs-supermin-helper '%s' %s %s",
+ path,
+ path, *kernel, *initrd);
r = system (cmd);
if (r == -1 || WEXITSTATUS(r) != 0) {
return g->qemu_help && strstr (g->qemu_help, option) != NULL;
}
-static void
-finish_wait_ready (guestfs_h *g, void *vp)
-{
- if (g->verbose)
- fprintf (stderr, "finish_wait_ready called, %p, vp = %p\n", g, vp);
-
- *((int *)vp) = 1;
- g->main_loop->main_loop_quit (g->main_loop, g);
-}
-
int
-guestfs_wait_ready (guestfs_h *g)
+guestfs__wait_ready (guestfs_h *g)
{
- int finished = 0, r;
+ int r;
+ uint32_t size;
+ void *buf = NULL;
if (g->state == READY) return 0;
return -1;
}
- g->launch_done_cb = finish_wait_ready;
- g->launch_done_cb_data = &finished;
- r = g->main_loop->main_loop_run (g->main_loop, g);
- g->launch_done_cb = NULL;
- g->launch_done_cb_data = NULL;
+ r = recv_from_daemon (g, &size, &buf);
+ free (buf);
if (r == -1) return -1;
- if (finished != 1) {
+ if (size != GUESTFS_LAUNCH_FLAG) {
error (g, _("guestfs_wait_ready failed, see earlier error messages"));
return -1;
}
}
int
-guestfs_kill_subprocess (guestfs_h *g)
+guestfs__kill_subprocess (guestfs_h *g)
{
if (g->state == CONFIG) {
error (g, _("no subprocess to kill"));
/* Access current state. */
int
-guestfs_is_config (guestfs_h *g)
+guestfs__is_config (guestfs_h *g)
{
return g->state == CONFIG;
}
int
-guestfs_is_launching (guestfs_h *g)
+guestfs__is_launching (guestfs_h *g)
{
return g->state == LAUNCHING;
}
int
-guestfs_is_ready (guestfs_h *g)
+guestfs__is_ready (guestfs_h *g)
{
return g->state == READY;
}
int
-guestfs_is_busy (guestfs_h *g)
+guestfs__is_busy (guestfs_h *g)
{
return g->state == BUSY;
}
int
-guestfs_get_state (guestfs_h *g)
+guestfs__get_state (guestfs_h *g)
{
return g->state;
}
-int
-guestfs_set_ready (guestfs_h *g)
+void
+guestfs_set_log_message_callback (guestfs_h *g,
+ guestfs_log_message_cb cb, void *opaque)
{
- if (g->state != BUSY) {
- error (g, _("guestfs_set_ready: called when in state %d != BUSY"),
- g->state);
- return -1;
- }
- g->state = READY;
- return 0;
+ 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)
+guestfs___set_busy (guestfs_h *g)
{
if (g->state != READY) {
error (g, _("guestfs_set_busy: called when in state %d != READY"),
- g->state);
+ g->state);
return -1;
}
g->state = BUSY;
}
int
-guestfs_end_busy (guestfs_h *g)
+guestfs___end_busy (guestfs_h *g)
{
switch (g->state)
{
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;
}
-/* Structure-freeing functions. These rely on the fact that the
- * structure format is identical to the XDR format. See note in
- * generator.ml.
- */
-void
-guestfs_free_int_bool (struct guestfs_int_bool *x)
-{
- free (x);
-}
-
-void
-guestfs_free_lvm_pv_list (struct guestfs_lvm_pv_list *x)
-{
- xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_pv_list, (char *) x);
- free (x);
-}
-
-void
-guestfs_free_lvm_vg_list (struct guestfs_lvm_vg_list *x)
-{
- xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_vg_list, (char *) x);
- free (x);
-}
-
-void
-guestfs_free_lvm_lv_list (struct guestfs_lvm_lv_list *x)
-{
- xdr_free ((xdrproc_t) xdr_guestfs_lvm_int_lv_list, (char *) x);
- free (x);
-}
-
-void
-guestfs_free_dirent_list (struct guestfs_dirent_list *x)
-{
- xdr_free ((xdrproc_t) xdr_guestfs_int_dirent_list, (char *) x);
- free (x);
-}
-
-/* We don't know if stdout_event or sock_read_event will be the
- * first to receive EOF if the qemu process dies. This function
- * has the common cleanup code for both.
- */
+/* This is called if we detect EOF, ie. qemu died. */
static void
child_cleanup (guestfs_h *g)
{
if (g->verbose)
- fprintf (stderr, "stdout_event: %p: child process died\n", g);
+ 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);
- if (g->stdout_watch >= 0)
- g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
- if (g->sock_watch >= 0)
- g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
close (g->fd[0]);
close (g->fd[1]);
close (g->sock);
g->pid = 0;
g->recoverypid = 0;
g->start_t = 0;
- g->stdout_watch = -1;
- g->sock_watch = -1;
g->state = CONFIG;
if (g->subprocess_quit_cb)
g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
}
-/* This function is called whenever qemu prints something on stdout.
- * Qemu's stdout is also connected to the guest's serial console, so
- * we see kernel messages here too.
- */
-static void
-stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
- int watch, int fd, int events)
+static int
+read_log_message_or_eof (guestfs_h *g, int fd)
{
- char buf[4096];
+ char buf[BUFSIZ];
int n;
#if 0
if (g->verbose)
fprintf (stderr,
- "stdout_event: %p g->state = %d, fd = %d, events = 0x%x\n",
- g, g->state, fd, events);
+ "read_log_message_or_eof: %p g->state = %d, fd = %d\n",
+ g, g->state, fd);
#endif
- if (g->fd[1] != fd) {
- error (g, _("stdout_event: internal error: %d != %d"), g->fd[1], fd);
- return;
- }
-
+ /* 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;
+ return -1;
}
if (n == -1) {
- if (errno != EINTR && errno != EAGAIN)
- perrorf (g, "read");
- return;
+ if (errno == EINTR || errno == EAGAIN)
+ return 0;
+
+ perrorf (g, "read");
+ return -1;
}
/* In verbose mode, copy all log messages to stderr. */
if (g->verbose)
- write (2, buf, n);
+ 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;
}
-/* The function is called whenever we can read something on the
- * guestfsd (daemon inside the guest) communication socket.
- */
-static void
-sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
- int watch, int fd, int events)
+static int
+check_for_daemon_cancellation_or_eof (guestfs_h *g, int fd)
{
- XDR xdr;
- u_int32_t len;
+ char buf[4];
int n;
+ uint32_t flag;
+ XDR xdr;
if (g->verbose)
fprintf (stderr,
- "sock_read_event: %p g->state = %d, fd = %d, events = 0x%x\n",
- g, g->state, fd, events);
+ "check_for_daemon_cancellation_or_eof: %p g->state = %d, fd = %d\n",
+ g, g->state, fd);
- if (g->sock != fd) {
- error (g, _("sock_read_event: internal error: %d != %d"), g->sock, fd);
- return;
- }
-
- if (g->msg_in_size <= g->msg_in_allocated) {
- g->msg_in_allocated += 4096;
- g->msg_in = safe_realloc (g, g->msg_in, g->msg_in_allocated);
- }
- n = read (g->sock, g->msg_in + g->msg_in_size,
- g->msg_in_allocated - g->msg_in_size);
+ n = read (fd, buf, 4);
if (n == 0) {
- /* Disconnected. */
+ /* Hopefully this indicates the qemu child process has died. */
child_cleanup (g);
- return;
+ return -1;
}
if (n == -1) {
- if (errno != EINTR && errno != EAGAIN)
- perrorf (g, "read");
- return;
- }
+ if (errno == EINTR || errno == EAGAIN)
+ return 0;
- g->msg_in_size += n;
+ perrorf (g, "read");
+ return -1;
+ }
- /* Have we got enough of a message to be able to process it yet? */
- again:
- if (g->msg_in_size < 4) return;
+ xdrmem_create (&xdr, buf, 4, XDR_DECODE);
+ xdr_uint32_t (&xdr, &flag);
+ xdr_destroy (&xdr);
- xdrmem_create (&xdr, g->msg_in, g->msg_in_size, XDR_DECODE);
- if (!xdr_uint32_t (&xdr, &len)) {
- error (g, _("can't decode length word"));
- goto cleanup;
+ 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;
}
- /* Length is normally the length of the message, but when guestfsd
- * starts up it sends a "magic" value (longer than any possible
- * message). Check for this.
- */
- if (len == GUESTFS_LAUNCH_FLAG) {
- if (g->state != LAUNCHING)
- error (g, _("received magic signature from guestfsd, but in state %d"),
- g->state);
- else if (g->msg_in_size != 4)
- error (g, _("received magic signature from guestfsd, but msg size is %d"),
- g->msg_in_size);
- else {
- g->state = READY;
- if (g->launch_done_cb)
- g->launch_done_cb (g, g->launch_done_cb_data);
- }
+ return -2;
+}
- goto cleanup;
- }
+/* 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;
- /* 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 (len == GUESTFS_CANCEL_FLAG) {
- g->msg_in_size -= 4;
- memmove (g->msg_in, g->msg_in+4, g->msg_in_size);
- goto again;
- }
+ if (g->verbose)
+ fprintf (stderr,
+ "send_to_daemon: %p g->state = %d, n = %zu\n", g, g->state, n);
- /* If this happens, it's pretty bad and we've probably lost
- * synchronization.
- */
- if (len > GUESTFS_MESSAGE_MAX) {
- error (g, _("message length (%u) > maximum possible size (%d)"),
- len, GUESTFS_MESSAGE_MAX);
- goto cleanup;
- }
+ FD_ZERO (&rset);
+ FD_ZERO (&wset);
- if (g->msg_in_size-4 < len) return; /* Need more of this message. */
+ 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. */
- /* Got the full message, begin processing it. */
-#if 0
- if (g->verbose) {
- int i, j;
+ int max_fd = g->sock > g->fd[1] ? g->sock : g->fd[1];
- for (i = 0; i < g->msg_in_size; i += 16) {
- printf ("%04x: ", i);
- for (j = i; j < MIN (i+16, g->msg_in_size); ++j)
- printf ("%02x ", (unsigned char) g->msg_in[j]);
- for (; j < i+16; ++j)
- printf (" ");
- printf ("|");
- for (j = i; j < MIN (i+16, g->msg_in_size); ++j)
- if (isprint (g->msg_in[j]))
- printf ("%c", g->msg_in[j]);
- else
- printf (".");
- for (; j < i+16; ++j)
- printf (" ");
- printf ("|\n");
+ 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;
}
- }
-#endif
- /* Not in the expected state. */
- if (g->state != BUSY)
- error (g, _("state %d != BUSY"), g->state);
-
- /* Push the message up to the higher layer. */
- if (g->reply_cb)
- g->reply_cb (g, g->reply_cb_data, &xdr);
- else
- /* This message (probably) should never be printed. */
- fprintf (stderr, "libguesfs: sock_read_event: !!! dropped message !!!\n");
-
- g->msg_in_size -= len + 4;
- memmove (g->msg_in, g->msg_in+len+4, g->msg_in_size);
- if (g->msg_in_size > 0) goto again;
-
- cleanup:
- /* Free the message buffer if it's grown excessively large. */
- if (g->msg_in_allocated > 65536) {
- free (g->msg_in);
- g->msg_in = NULL;
- g->msg_in_size = g->msg_in_allocated = 0;
- } else
- g->msg_in_size = 0;
+ 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;
+ }
+ }
- xdr_destroy (&xdr);
+ return 0;
}
-/* The function is called whenever we can write something on the
- * guestfsd (daemon inside the guest) communication socket.
+/* 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 void
-sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
- int watch, int fd, int events)
+static int
+recv_from_daemon (guestfs_h *g, uint32_t *size_rtn, void **buf_rtn)
{
- int n, err;
+ fd_set rset, rset2;
if (g->verbose)
fprintf (stderr,
- "sock_write_event: %p g->state = %d, fd = %d, events = 0x%x\n",
- g, g->state, fd, events);
-
- if (g->sock != fd) {
- error (g, _("sock_write_event: internal error: %d != %d"), g->sock, fd);
- return;
- }
-
- if (g->state != BUSY) {
- error (g, _("sock_write_event: state %d != BUSY"), g->state);
- return;
- }
+ "recv_from_daemon: %p g->state = %d, size_rtn = %p, buf_rtn = %p\n",
+ g, g->state, size_rtn, buf_rtn);
- if (g->verbose)
- fprintf (stderr, "sock_write_event: writing %d bytes ...\n",
- g->msg_out_size - g->msg_out_pos);
-
- n = write (g->sock, g->msg_out + g->msg_out_pos,
- g->msg_out_size - g->msg_out_pos);
- if (n == -1) {
- err = errno;
- if (err != EAGAIN)
- perrorf (g, "write");
- if (err == EPIPE) /* Disconnected from guest (RHBZ#508713). */
- child_cleanup (g);
- return;
- }
-
- if (g->verbose)
- fprintf (stderr, "sock_write_event: wrote %d bytes\n", n);
-
- g->msg_out_pos += n;
-
- /* More to write? */
- if (g->msg_out_pos < g->msg_out_size)
- return;
-
- if (g->verbose)
- fprintf (stderr, "sock_write_event: done writing, calling send_cb\n");
-
- free (g->msg_out);
- g->msg_out = NULL;
- g->msg_out_pos = g->msg_out_size = 0;
-
- /* Done writing, call the higher layer. */
- if (g->send_cb)
- g->send_cb (g, g->send_cb_data);
-}
-
-void
-guestfs_set_send_callback (guestfs_h *g,
- guestfs_send_cb cb, void *opaque)
-{
- g->send_cb = cb;
- g->send_cb_data = opaque;
-}
-
-void
-guestfs_set_reply_callback (guestfs_h *g,
- guestfs_reply_cb cb, void *opaque)
-{
- g->reply_cb = cb;
- g->reply_cb_data = opaque;
-}
-
-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;
-}
+ FD_ZERO (&rset);
-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;
-}
+ FD_SET (g->fd[1], &rset); /* Read qemu stdout for log messages & EOF. */
+ FD_SET (g->sock, &rset); /* Read socket for data & EOF. */
-/* Access to the handle's main loop and the default main loop. */
-void
-guestfs_set_main_loop (guestfs_h *g, guestfs_main_loop *main_loop)
-{
- g->main_loop = main_loop;
-}
+ int max_fd = g->sock > g->fd[1] ? g->sock : g->fd[1];
-guestfs_main_loop *
-guestfs_get_main_loop (guestfs_h *g)
-{
- return g->main_loop;
-}
+ *size_rtn = 0;
+ *buf_rtn = NULL;
-guestfs_main_loop *
-guestfs_get_default_main_loop (void)
-{
- return (guestfs_main_loop *) &default_main_loop;
-}
+ 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;
-/* Change the daemon socket handler so that we are now writing.
- * This sets the handle to sock_write_event.
- */
-int
-guestfs__switch_to_sending (guestfs_h *g)
-{
- if (g->sock_watch >= 0) {
- if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
- error (g, _("remove_handle failed"));
- g->sock_watch = -1;
+ 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;
}
- }
-
- g->sock_watch =
- g->main_loop->add_handle (g->main_loop, g, g->sock,
- GUESTFS_HANDLE_WRITABLE,
- sock_write_event, NULL);
- if (g->sock_watch == -1) {
- error (g, _("add_handle failed"));
- return -1;
- }
- return 0;
-}
+ 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*/
+ }
-int
-guestfs__switch_to_receiving (guestfs_h *g)
-{
- if (g->sock_watch >= 0) {
- if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
- error (g, _("remove_handle failed"));
- g->sock_watch = -1;
- return -1;
+ 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;
}
}
- g->sock_watch =
- g->main_loop->add_handle (g->main_loop, g, g->sock,
- GUESTFS_HANDLE_READABLE,
- sock_read_event, NULL);
- if (g->sock_watch == -1) {
- error (g, _("add_handle failed"));
- return -1;
+ /* 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 (isprint ((*(char **)buf_rtn)[j]))
+ printf ("%c", (*(char **)buf_rtn)[j]);
+ else
+ printf (".");
+ for (; j < i+16; ++j)
+ printf (" ");
+ printf ("|\n");
+ }
}
+#endif
return 0;
}
-/* Dispatch a call (len + header + args) to the remote daemon,
- * synchronously (ie. using the guest's main loop to wait until
- * it has been sent). Returns -1 for error, or the serial
- * number of the message.
- */
-static void
-send_cb (guestfs_h *g, void *data)
-{
- guestfs_main_loop *ml = guestfs_get_main_loop (g);
-
- *((int *)data) = 1;
- ml->main_loop_quit (ml, g);
-}
-
int
-guestfs__send_sync (guestfs_h *g, int proc_nr,
- xdrproc_t xdrp, char *args)
+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 sent;
- guestfs_main_loop *ml = guestfs_get_main_loop (g);
+ int r;
+ char *msg_out;
+ size_t msg_out_size;
if (g->state != BUSY) {
- error (g, _("guestfs__send_sync: state %d != BUSY"), g->state);
- return -1;
- }
-
- /* This is probably an internal error. Or perhaps we should just
- * free the buffer anyway?
- */
- if (g->msg_out != NULL) {
- error (g, _("guestfs__send_sync: msg_out should be NULL"));
+ error (g, _("guestfs___send: state %d != BUSY"), g->state);
return -1;
}
* we have quite limited stack space available, notably when
* running in the JVM.
*/
- g->msg_out = safe_malloc (g, GUESTFS_MESSAGE_MAX + 4);
- xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MESSAGE_MAX, XDR_ENCODE);
+ 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;
len = xdr_getpos (&xdr);
xdr_destroy (&xdr);
- g->msg_out = safe_realloc (g, g->msg_out, len + 4);
- g->msg_out_size = len + 4;
- g->msg_out_pos = 0;
+ msg_out = safe_realloc (g, msg_out, len + 4);
+ msg_out_size = len + 4;
- xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
+ xdrmem_create (&xdr, msg_out, 4, XDR_ENCODE);
xdr_uint32_t (&xdr, &len);
- if (guestfs__switch_to_sending (g) == -1)
- goto cleanup1;
-
- sent = 0;
- guestfs_set_send_callback (g, send_cb, &sent);
- if (ml->main_loop_run (ml, g) == -1)
- goto cleanup1;
- if (sent != 1) {
- error (g, _("send failed, see earlier error messages"));
+ 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 (g->msg_out);
- g->msg_out = NULL;
- g->msg_out_size = 0;
+ free (msg_out);
return -1;
}
static int cancel = 0; /* XXX Implement file cancellation. */
-static int send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t len);
-static int send_file_data_sync (guestfs_h *g, const char *buf, size_t len);
-static int send_file_cancellation_sync (guestfs_h *g);
-static int send_file_complete_sync (guestfs_h *g);
+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);
-/* Synchronously send a file.
+/* Send a file.
* Returns:
* 0 OK
* -1 error
* -2 daemon cancelled (we must read the error message)
*/
int
-guestfs__send_file_sync (guestfs_h *g, const char *filename)
+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_sync (g);
+ send_file_cancellation (g);
/* Daemon sees cancellation and won't reply, so caller can
* just return here.
*/
if (r == -1 && (errno == EINTR || errno == EAGAIN))
continue;
if (r <= 0) break;
- err = send_file_data_sync (g, buf, r);
+ err = send_file_data (g, buf, r);
if (err < 0) {
if (err == -2) /* daemon sent cancellation */
- send_file_cancellation_sync (g);
+ send_file_cancellation (g);
return err;
}
}
if (cancel) { /* cancel from either end */
- send_file_cancellation_sync (g);
+ send_file_cancellation (g);
return -1;
}
if (r == -1) {
perrorf (g, "read: %s", filename);
- send_file_cancellation_sync (g);
+ send_file_cancellation (g);
return -1;
}
*/
if (close (fd) == -1) {
perrorf (g, "close: %s", filename);
- send_file_cancellation_sync (g);
+ send_file_cancellation (g);
return -1;
}
- return send_file_complete_sync (g);
+ return send_file_complete (g);
}
/* Send a chunk of file data. */
static int
-send_file_data_sync (guestfs_h *g, const char *buf, size_t len)
+send_file_data (guestfs_h *g, const char *buf, size_t len)
{
- return send_file_chunk_sync (g, 0, buf, len);
+ return send_file_chunk (g, 0, buf, len);
}
/* Send a cancellation message. */
static int
-send_file_cancellation_sync (guestfs_h *g)
+send_file_cancellation (guestfs_h *g)
{
- return send_file_chunk_sync (g, 1, NULL, 0);
+ return send_file_chunk (g, 1, NULL, 0);
}
/* Send a file complete chunk. */
static int
-send_file_complete_sync (guestfs_h *g)
+send_file_complete (guestfs_h *g)
{
char buf[1];
- return send_file_chunk_sync (g, 0, buf, 0);
+ return send_file_chunk (g, 0, buf, 0);
}
-/* Send a chunk, cancellation or end of file, synchronously (ie. wait
- * for it to go).
- */
-static int check_for_daemon_cancellation (guestfs_h *g);
-
static int
-send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t buflen)
+send_file_chunk (guestfs_h *g, int cancel, const char *buf, size_t buflen)
{
u_int32_t len;
- int sent;
+ int r;
guestfs_chunk chunk;
XDR xdr;
- guestfs_main_loop *ml = guestfs_get_main_loop (g);
+ char *msg_out;
+ size_t msg_out_size;
if (g->state != BUSY) {
- error (g, _("send_file_chunk_sync: state %d != READY"), g->state);
- return -1;
- }
-
- /* This is probably an internal error. Or perhaps we should just
- * free the buffer anyway?
- */
- if (g->msg_out != NULL) {
- error (g, _("guestfs__send_sync: msg_out should be NULL"));
+ error (g, _("send_file_chunk: state %d != READY"), g->state);
return -1;
}
- /* Did the daemon send a cancellation message? */
- if (check_for_daemon_cancellation (g)) {
- if (g->verbose)
- fprintf (stderr, "got daemon cancellation\n");
- return -2;
- }
-
/* Allocate the chunk buffer. Don't use the stack to avoid
* excessive stack usage and unnecessary copies.
*/
- g->msg_out = safe_malloc (g, GUESTFS_MAX_CHUNK_SIZE + 4 + 48);
- xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MAX_CHUNK_SIZE + 48, XDR_ENCODE);
+ 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;
if (!xdr_guestfs_chunk (&xdr, &chunk)) {
error (g, _("xdr_guestfs_chunk failed (buf = %p, buflen = %zu)"),
- buf, buflen);
+ buf, buflen);
xdr_destroy (&xdr);
goto cleanup1;
}
xdr_destroy (&xdr);
/* Reduce the size of the outgoing message buffer to the real length. */
- g->msg_out = safe_realloc (g, g->msg_out, len + 4);
- g->msg_out_size = len + 4;
- g->msg_out_pos = 0;
+ msg_out = safe_realloc (g, msg_out, len + 4);
+ msg_out_size = len + 4;
- xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
+ xdrmem_create (&xdr, msg_out, 4, XDR_ENCODE);
xdr_uint32_t (&xdr, &len);
- if (guestfs__switch_to_sending (g) == -1)
- goto cleanup1;
+ r = send_to_daemon (g, msg_out, msg_out_size);
- sent = 0;
- guestfs_set_send_callback (g, send_cb, &sent);
- if (ml->main_loop_run (ml, g) == -1)
- goto cleanup1;
- if (sent != 1) {
- error (g, _("send file chunk failed, see earlier error messages"));
- goto cleanup1;
+ /* 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 (g->msg_out);
- g->msg_out = NULL;
- g->msg_out_size = 0;
+ free (msg_out);
return -1;
}
-/* At this point we are sending FileIn file(s) to the guest, and not
- * expecting to read anything, so if we do read anything, it must be
- * a cancellation message. This checks for this case without blocking.
- */
-static int
-check_for_daemon_cancellation (guestfs_h *g)
+/* 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)
{
- fd_set rset;
- struct timeval tv;
- int r;
- char buf[4];
- uint32_t flag;
XDR xdr;
+ void *buf;
+ uint32_t size;
+ int r;
- FD_ZERO (&rset);
- FD_SET (g->sock, &rset);
- tv.tv_sec = 0;
- tv.tv_usec = 0;
- r = select (g->sock+1, &rset, NULL, NULL, &tv);
- if (r == -1) {
- perrorf (g, "select");
- return 0;
- }
- if (r == 0)
- return 0;
+ again:
+ r = recv_from_daemon (g, &size, &buf);
+ if (r == -1)
+ return -1;
- /* Read the message from the daemon. */
- r = xread (g->sock, buf, sizeof buf);
- if (r == -1) {
- perrorf (g, "read");
- return 0;
+ /* 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, sizeof buf, XDR_DECODE);
- xdr_uint32_t (&xdr, &flag);
- xdr_destroy (&xdr);
+ xdrmem_create (&xdr, buf, size, XDR_DECODE);
- if (flag != GUESTFS_CANCEL_FLAG) {
- error (g, _("check_for_daemon_cancellation: read 0x%x from daemon, expected 0x%x\n"),
- flag, GUESTFS_CANCEL_FLAG);
- return 0;
+ 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 1;
+ return 0;
}
-/* Synchronously receive a file. */
+/* Receive a file. */
-/* Returns -1 = error, 0 = EOF, 1 = more data */
-static int receive_file_data_sync (guestfs_h *g, void **buf, size_t *len);
+/* Returns -1 = error, 0 = EOF, > 0 = more data */
+static ssize_t receive_file_data (guestfs_h *g, void **buf);
int
-guestfs__receive_file_sync (guestfs_h *g, const char *filename)
+guestfs___recv_file (guestfs_h *g, const char *filename)
{
void *buf;
int fd, r;
}
/* Receive the file in chunked encoding. */
- while ((r = receive_file_data_sync (g, &buf, &len)) >= 0) {
- if (xwrite (fd, buf, len) == -1) {
+ 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 == 0) break; /* End of file. */
}
if (r == -1) {
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);
return -1;
}
- while ((r = receive_file_data_sync (g, NULL, NULL)) > 0)
- ; /* just discard it */
+ while (receive_file_data (g, NULL) > 0)
+ ; /* just discard it */
return -1;
}
-/* Note that the reply callback can be called multiple times before
- * the main loop quits and we get back to the synchronous code. So
- * we have to be prepared to save multiple chunks on a list here.
- */
-struct receive_file_ctx {
- int count; /* 0 if receive_file_cb not called, or
- * else count number of chunks.
- */
- guestfs_chunk *chunks; /* Array of chunks. */
-};
-
-static void
-free_chunks (struct receive_file_ctx *ctx)
-{
- int i;
-
- for (i = 0; i < ctx->count; ++i)
- free (ctx->chunks[i].data.data_val);
-
- free (ctx->chunks);
-}
-
-static void
-receive_file_cb (guestfs_h *g, void *data, XDR *xdr)
-{
- guestfs_main_loop *ml = guestfs_get_main_loop (g);
- struct receive_file_ctx *ctx = (struct receive_file_ctx *) data;
- guestfs_chunk chunk;
-
- if (ctx->count == -1) /* Parse error occurred previously. */
- return;
-
- ml->main_loop_quit (ml, g);
-
- memset (&chunk, 0, sizeof chunk);
-
- if (!xdr_guestfs_chunk (xdr, &chunk)) {
- error (g, _("failed to parse file chunk"));
- free_chunks (ctx);
- ctx->chunks = NULL;
- ctx->count = -1;
- return;
- }
-
- /* Copy the chunk to the list. */
- ctx->chunks = safe_realloc (g, ctx->chunks,
- sizeof (guestfs_chunk) * (ctx->count+1));
- ctx->chunks[ctx->count] = chunk;
- ctx->count++;
-}
-
/* Receive a chunk of file data. */
-/* Returns -1 = error, 0 = EOF, 1 = more data */
-static int
-receive_file_data_sync (guestfs_h *g, void **buf, size_t *len_r)
+/* Returns -1 = error, 0 = EOF, > 0 = more data */
+static ssize_t
+receive_file_data (guestfs_h *g, void **buf_r)
{
- struct receive_file_ctx ctx;
- guestfs_main_loop *ml = guestfs_get_main_loop (g);
- int i;
- size_t len;
-
- ctx.count = 0;
- ctx.chunks = NULL;
-
- guestfs_set_reply_callback (g, receive_file_cb, &ctx);
- (void) ml->main_loop_run (ml, g);
- guestfs_set_reply_callback (g, NULL, NULL);
-
- if (ctx.count == 0) {
- error (g, _("receive_file_data_sync: reply callback not called\n"));
- return -1;
- }
-
- if (ctx.count == -1) {
- error (g, _("receive_file_data_sync: parse error in reply callback\n"));
- /* callback already freed the chunks */
- return -1;
- }
-
- if (g->verbose)
- fprintf (stderr, "receive_file_data_sync: got %d chunks\n", ctx.count);
-
- /* Process each chunk in the list. */
- if (buf) *buf = NULL; /* Accumulate data in this buffer. */
- len = 0;
-
- for (i = 0; i < ctx.count; ++i) {
- if (ctx.chunks[i].cancel) {
- error (g, _("file receive cancelled by daemon"));
- free_chunks (&ctx);
- if (buf) free (*buf);
- if (len_r) *len_r = 0;
- return -1;
- }
-
- if (ctx.chunks[i].data.data_len == 0) { /* end of transfer */
- free_chunks (&ctx);
- if (len_r) *len_r = len;
- return 0;
- }
-
- if (buf) {
- *buf = safe_realloc (g, *buf, len + ctx.chunks[i].data.data_len);
- memcpy (*buf+len, ctx.chunks[i].data.data_val,
- ctx.chunks[i].data.data_len);
- }
- len += ctx.chunks[i].data.data_len;
- }
-
- if (len_r) *len_r = len;
- free_chunks (&ctx);
- return 1;
-}
-
-/* This is the default main loop implementation, using select(2). */
-
-static int
-select_add_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd, int events,
- guestfs_handle_event_cb cb, void *data)
-{
- struct select_main_loop *ml = (struct select_main_loop *) mlv;
-
- if (fd < 0 || fd >= FD_SETSIZE) {
- error (g, _("fd %d is out of range"), fd);
- return -1;
- }
-
- if ((events & ~(GUESTFS_HANDLE_READABLE |
- GUESTFS_HANDLE_WRITABLE |
- GUESTFS_HANDLE_HANGUP |
- GUESTFS_HANDLE_ERROR)) != 0) {
- error (g, _("set of events (0x%x) contains unknown events"), events);
- return -1;
- }
-
- if (events == 0) {
- error (g, _("set of events is empty"));
- return -1;
- }
+ int r;
+ void *buf;
+ uint32_t len;
+ XDR xdr;
+ guestfs_chunk chunk;
- if (FD_ISSET (fd, &ml->rset) ||
- FD_ISSET (fd, &ml->wset) ||
- FD_ISSET (fd, &ml->xset)) {
- error (g, _("fd %d is already registered"), fd);
+ r = recv_from_daemon (g, &len, &buf);
+ if (r == -1) {
+ error (g, _("receive_file_data: parse error in reply callback"));
return -1;
}
- if (cb == NULL) {
- error (g, _("callback is NULL"));
+ if (len == GUESTFS_LAUNCH_FLAG || len == GUESTFS_CANCEL_FLAG) {
+ error (g, _("receive_file_data: unexpected flag received when reading file chunks"));
return -1;
}
- if ((events & GUESTFS_HANDLE_READABLE))
- FD_SET (fd, &ml->rset);
- if ((events & GUESTFS_HANDLE_WRITABLE))
- FD_SET (fd, &ml->wset);
- if ((events & GUESTFS_HANDLE_HANGUP) || (events & GUESTFS_HANDLE_ERROR))
- FD_SET (fd, &ml->xset);
-
- if (fd > ml->max_fd) {
- ml->max_fd = fd;
- ml->handle_cb_data =
- safe_realloc (g, ml->handle_cb_data,
- sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
- }
- ml->handle_cb_data[fd].cb = cb;
- ml->handle_cb_data[fd].g = g;
- ml->handle_cb_data[fd].data = data;
-
- ml->nr_fds++;
-
- /* Any integer >= 0 can be the handle, and this is as good as any ... */
- return fd;
-}
-
-static int
-select_remove_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd)
-{
- struct select_main_loop *ml = (struct select_main_loop *) mlv;
-
- if (fd < 0 || fd >= FD_SETSIZE) {
- error (g, _("fd %d is out of range"), fd);
- return -1;
- }
+ memset (&chunk, 0, sizeof chunk);
- if (!FD_ISSET (fd, &ml->rset) &&
- !FD_ISSET (fd, &ml->wset) &&
- !FD_ISSET (fd, &ml->xset)) {
- error (g, _("fd %d was not registered"), fd);
+ 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);
- FD_CLR (fd, &ml->rset);
- FD_CLR (fd, &ml->wset);
- FD_CLR (fd, &ml->xset);
-
- if (fd == ml->max_fd) {
- ml->max_fd--;
- ml->handle_cb_data =
- safe_realloc (g, ml->handle_cb_data,
- sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
- }
-
- ml->nr_fds--;
-
- return 0;
-}
-
-static int
-select_add_timeout (guestfs_main_loop *mlv, guestfs_h *g, int interval,
- guestfs_handle_timeout_cb cb, void *data)
-{
- //struct select_main_loop *ml = (struct select_main_loop *) mlv;
-
- abort (); /* XXX not implemented yet */
-}
-
-static int
-select_remove_timeout (guestfs_main_loop *mlv, guestfs_h *g, int timer)
-{
- //struct select_main_loop *ml = (struct select_main_loop *) mlv;
-
- abort (); /* XXX not implemented yet */
-}
-
-/* The 'g' parameter is just used for error reporting. Events
- * for multiple handles can be dispatched by running the main
- * loop.
- */
-static int
-select_main_loop_run (guestfs_main_loop *mlv, guestfs_h *g)
-{
- struct select_main_loop *ml = (struct select_main_loop *) mlv;
- int fd, r, events;
- fd_set rset2, wset2, xset2;
-
- if (ml->is_running) {
- error (g, _("select_main_loop_run: this cannot be called recursively"));
+ if (chunk.cancel) {
+ error (g, _("file receive cancelled by daemon"));
+ free (chunk.data.data_val);
return -1;
}
- ml->is_running = 1;
-
- while (ml->is_running) {
- if (ml->nr_fds == 0)
- break;
-
- rset2 = ml->rset;
- wset2 = ml->wset;
- xset2 = ml->xset;
- r = select (ml->max_fd+1, &rset2, &wset2, &xset2, NULL);
- if (r == -1) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- perrorf (g, "select");
- ml->is_running = 0;
- return -1;
- }
-
- for (fd = 0; r > 0 && fd <= ml->max_fd; ++fd) {
- events = 0;
- if (FD_ISSET (fd, &rset2))
- events |= GUESTFS_HANDLE_READABLE;
- if (FD_ISSET (fd, &wset2))
- events |= GUESTFS_HANDLE_WRITABLE;
- if (FD_ISSET (fd, &xset2))
- events |= GUESTFS_HANDLE_ERROR | GUESTFS_HANDLE_HANGUP;
- if (events) {
- r--;
- ml->handle_cb_data[fd].cb ((guestfs_main_loop *) ml,
- ml->handle_cb_data[fd].g,
- ml->handle_cb_data[fd].data,
- fd, fd, events);
- }
- }
+ if (chunk.data.data_len == 0) { /* end of transfer */
+ free (chunk.data.data_val);
+ return 0;
}
- ml->is_running = 0;
- return 0;
-}
-
-static int
-select_main_loop_quit (guestfs_main_loop *mlv, guestfs_h *g)
-{
- struct select_main_loop *ml = (struct select_main_loop *) mlv;
+ if (buf_r) *buf_r = chunk.data.data_val;
+ else free (chunk.data.data_val); /* else caller frees */
- /* Note that legitimately ml->is_running can be zero when
- * this function is called.
- */
-
- ml->is_running = 0;
- return 0;
+ return chunk.data.data_len;
}
git.annexia.org / libguestfs.git / blobdiff