2 * Copyright (C) 2009 Red Hat Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #define _BSD_SOURCE /* for mkdtemp, usleep */
22 #define _GNU_SOURCE /* for vasprintf, GNU strerror_r, strchrnul */
34 #include <sys/select.h>
37 #include <rpc/types.h>
44 #ifdef HAVE_SYS_TYPES_H
45 #include <sys/types.h>
48 #ifdef HAVE_SYS_WAIT_H
52 #ifdef HAVE_SYS_SOCKET_H
53 #include <sys/socket.h>
61 #include "guestfs_protocol.h"
65 #define _(str) dgettext(PACKAGE, (str))
66 #define N_(str) dgettext(PACKAGE, (str))
72 #define error guestfs_error
73 #define perrorf guestfs_perrorf
74 #define safe_malloc guestfs_safe_malloc
75 #define safe_realloc guestfs_safe_realloc
76 #define safe_strdup guestfs_safe_strdup
77 #define safe_memdup guestfs_safe_memdup
79 static void default_error_cb (guestfs_h *g, void *data, const char *msg);
80 static void stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
81 static void sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
82 static void sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
84 static void close_handles (void);
86 static int select_add_handle (guestfs_main_loop *ml, guestfs_h *g, int fd, int events, guestfs_handle_event_cb cb, void *data);
87 static int select_remove_handle (guestfs_main_loop *ml, guestfs_h *g, int watch);
88 static int select_add_timeout (guestfs_main_loop *ml, guestfs_h *g, int interval, guestfs_handle_timeout_cb cb, void *data);
89 static int select_remove_timeout (guestfs_main_loop *ml, guestfs_h *g, int timer);
90 static int select_main_loop_run (guestfs_main_loop *ml, guestfs_h *g);
91 static int select_main_loop_quit (guestfs_main_loop *ml, guestfs_h *g);
93 /* Default select-based main loop. */
94 struct select_handle_cb_data {
95 guestfs_handle_event_cb cb;
100 struct select_main_loop {
101 /* NB. These fields must be the same as in struct guestfs_main_loop: */
102 guestfs_add_handle_cb add_handle;
103 guestfs_remove_handle_cb remove_handle;
104 guestfs_add_timeout_cb add_timeout;
105 guestfs_remove_timeout_cb remove_timeout;
106 guestfs_main_loop_run_cb main_loop_run;
107 guestfs_main_loop_quit_cb main_loop_quit;
109 /* Additional private data: */
118 struct select_handle_cb_data *handle_cb_data;
121 /* Default main loop. */
122 static struct select_main_loop default_main_loop = {
123 .add_handle = select_add_handle,
124 .remove_handle = select_remove_handle,
125 .add_timeout = select_add_timeout,
126 .remove_timeout = select_remove_timeout,
127 .main_loop_run = select_main_loop_run,
128 .main_loop_quit = select_main_loop_quit,
130 /* XXX hopefully .rset, .wset, .xset are initialized to the empty
131 * set by the normal action of everything being initialized to zero.
136 .handle_cb_data = NULL,
139 #define UNIX_PATH_MAX 108
141 /* Also in guestfsd.c */
142 #define VMCHANNEL_PORT 6666
143 #define VMCHANNEL_ADDR "10.0.2.4"
145 /* GuestFS handle and connection. */
146 enum state { CONFIG, LAUNCHING, READY, BUSY, NO_HANDLE };
150 struct guestfs_h *next; /* Linked list of open handles. */
152 /* State: see the state machine diagram in the man page guestfs(3). */
155 int fd[2]; /* Stdin/stdout of qemu. */
156 int sock; /* Daemon communications socket. */
157 pid_t pid; /* Qemu PID. */
158 pid_t recoverypid; /* Recovery process PID. */
159 time_t start_t; /* The time when we started qemu. */
161 int stdout_watch; /* Watches qemu stdout for log messages. */
162 int sock_watch; /* Watches daemon comm socket. */
164 char *tmpdir; /* Temporary directory containing socket. */
166 char *qemu_help, *qemu_version; /* Output of qemu -help, qemu -version. */
168 char **cmdline; /* Qemu command line. */
174 char *path; /* Path to kernel, initrd. */
175 char *qemu; /* Qemu binary. */
176 char *append; /* Append to kernel command line. */
178 int memsize; /* Size of RAM (megabytes). */
183 guestfs_abort_cb abort_cb;
184 guestfs_error_handler_cb error_cb;
185 void * error_cb_data;
186 guestfs_send_cb send_cb;
188 guestfs_reply_cb reply_cb;
189 void * reply_cb_data;
190 guestfs_log_message_cb log_message_cb;
191 void * log_message_cb_data;
192 guestfs_subprocess_quit_cb subprocess_quit_cb;
193 void * subprocess_quit_cb_data;
194 guestfs_launch_done_cb launch_done_cb;
195 void * launch_done_cb_data;
197 /* Main loop used by this handle. */
198 guestfs_main_loop *main_loop;
200 /* Messages sent and received from the daemon. */
202 int msg_in_size, msg_in_allocated;
204 int msg_out_size, msg_out_pos;
209 static guestfs_h *handles = NULL;
210 static int atexit_handler_set = 0;
213 guestfs_create (void)
218 g = malloc (sizeof (*g));
221 memset (g, 0, sizeof (*g));
228 g->stdout_watch = -1;
232 g->error_cb = default_error_cb;
233 g->error_cb_data = NULL;
235 str = getenv ("LIBGUESTFS_DEBUG");
236 g->verbose = str != NULL && strcmp (str, "1") == 0;
238 str = getenv ("LIBGUESTFS_PATH");
239 g->path = str != NULL ? strdup (str) : strdup (GUESTFS_DEFAULT_PATH);
240 if (!g->path) goto error;
242 str = getenv ("LIBGUESTFS_QEMU");
243 g->qemu = str != NULL ? strdup (str) : strdup (QEMU);
244 if (!g->qemu) goto error;
246 str = getenv ("LIBGUESTFS_APPEND");
248 g->append = strdup (str);
249 if (!g->append) goto error;
252 /* Choose a suitable memory size. Previously we tried to choose
253 * a minimal memory size, but this isn't really necessary since
254 * recent QEMU and KVM don't do anything nasty like locking
255 * memory into core any more. Thus we can safely choose a
256 * large, generous amount of memory, and it'll just get swapped
257 * on smaller systems.
259 str = getenv ("LIBGUESTFS_MEMSIZE");
261 if (sscanf (str, "%d", &g->memsize) != 1 || g->memsize <= 256) {
262 fprintf (stderr, "libguestfs: non-numeric or too small value for LIBGUESTFS_MEMSIZE\n");
268 g->main_loop = guestfs_get_default_main_loop ();
270 /* Start with large serial numbers so they are easy to spot
271 * inside the protocol.
273 g->msg_next_serial = 0x00123400;
275 /* Link the handles onto a global list. This is the one area
276 * where the library needs to be made thread-safe. (XXX)
278 /* acquire mutex (XXX) */
281 if (!atexit_handler_set) {
282 atexit (close_handles);
283 atexit_handler_set = 1;
285 /* release mutex (XXX) */
288 fprintf (stderr, "new guestfs handle %p\n", g);
301 guestfs_close (guestfs_h *g)
307 if (g->state == NO_HANDLE) {
308 /* Not safe to call 'error' here, so ... */
309 fprintf (stderr, _("guestfs_close: called twice on the same handle\n"));
314 fprintf (stderr, "closing guestfs handle %p (state %d)\n", g, g->state);
316 /* Try to sync if autosync flag is set. */
317 if (g->autosync && g->state == READY) {
318 guestfs_umount_all (g);
322 /* Remove any handlers that might be called back before we kill the
325 g->log_message_cb = NULL;
327 if (g->state != CONFIG)
328 guestfs_kill_subprocess (g);
330 /* Close any sockets and deregister any handlers. */
331 if (g->stdout_watch >= 0)
332 g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
333 if (g->sock_watch >= 0)
334 g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
335 g->stdout_watch = -1;
348 /* Remove tmpfiles. */
350 snprintf (filename, sizeof filename, "%s/sock", g->tmpdir);
353 snprintf (filename, sizeof filename, "%s/initrd", g->tmpdir);
356 snprintf (filename, sizeof filename, "%s/kernel", g->tmpdir);
365 for (i = 0; i < g->cmdline_size; ++i)
366 free (g->cmdline[i]);
370 /* Mark the handle as dead before freeing it. */
371 g->state = NO_HANDLE;
373 /* acquire mutex (XXX) */
377 for (gg = handles; gg->next != g; gg = gg->next)
381 /* release mutex (XXX) */
385 free (g->last_error);
390 free (g->qemu_version);
394 /* Close all open handles (called from atexit(3)). */
398 while (handles) guestfs_close (handles);
402 guestfs_last_error (guestfs_h *g)
404 return g->last_error;
408 set_last_error (guestfs_h *g, const char *msg)
410 free (g->last_error);
411 g->last_error = strdup (msg);
415 default_error_cb (guestfs_h *g, void *data, const char *msg)
417 fprintf (stderr, _("libguestfs: error: %s\n"), msg);
421 guestfs_error (guestfs_h *g, const char *fs, ...)
427 int err = vasprintf (&msg, fs, args);
432 if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
433 set_last_error (g, msg);
439 guestfs_perrorf (guestfs_h *g, const char *fs, ...)
446 int err = vasprintf (&msg, fs, args);
453 strerror_r (errnum, buf, sizeof buf);
457 buf = strerror_r (errnum, _buf, sizeof _buf);
460 msg = safe_realloc (g, msg, strlen (msg) + 2 + strlen (buf) + 1);
464 if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
465 set_last_error (g, msg);
471 guestfs_safe_malloc (guestfs_h *g, size_t nbytes)
473 void *ptr = malloc (nbytes);
474 if (nbytes > 0 && !ptr) g->abort_cb ();
478 /* Return 1 if an array of N objects, each of size S, cannot exist due
479 to size arithmetic overflow. S must be positive and N must be
480 nonnegative. This is a macro, not an inline function, so that it
481 works correctly even when SIZE_MAX < N.
483 By gnulib convention, SIZE_MAX represents overflow in size
484 calculations, so the conservative dividend to use here is
485 SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
486 However, malloc (SIZE_MAX) fails on all known hosts where
487 sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
488 exactly-SIZE_MAX allocations on such hosts; this avoids a test and
489 branch when S is known to be 1. */
490 # define xalloc_oversized(n, s) \
491 ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
493 /* Technically we should add an autoconf test for this, testing for the desired
494 functionality, like what's done in gnulib, but for now, this is fine. */
495 #define HAVE_GNU_CALLOC (__GLIBC__ >= 2)
497 /* Allocate zeroed memory for N elements of S bytes, with error
498 checking. S must be nonzero. */
500 guestfs_safe_calloc (guestfs_h *g, size_t n, size_t s)
502 /* From gnulib's calloc function in xmalloc.c. */
504 /* Test for overflow, since some calloc implementations don't have
505 proper overflow checks. But omit overflow and size-zero tests if
506 HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
507 returns NULL if successful. */
508 if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s))
509 || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
515 guestfs_safe_realloc (guestfs_h *g, void *ptr, int nbytes)
517 void *p = realloc (ptr, nbytes);
518 if (nbytes > 0 && !p) g->abort_cb ();
523 guestfs_safe_strdup (guestfs_h *g, const char *str)
525 char *s = strdup (str);
526 if (!s) g->abort_cb ();
531 guestfs_safe_memdup (guestfs_h *g, void *ptr, size_t size)
533 void *p = malloc (size);
534 if (!p) g->abort_cb ();
535 memcpy (p, ptr, size);
540 xwrite (int fd, const void *buf, size_t len)
545 r = write (fd, buf, len);
557 xread (int fd, void *buf, size_t len)
562 r = read (fd, buf, len);
564 if (errno == EINTR || errno == EAGAIN)
577 guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
583 guestfs_get_out_of_memory_handler (guestfs_h *g)
589 guestfs_set_error_handler (guestfs_h *g, guestfs_error_handler_cb cb, void *data)
592 g->error_cb_data = data;
595 guestfs_error_handler_cb
596 guestfs_get_error_handler (guestfs_h *g, void **data_rtn)
598 if (data_rtn) *data_rtn = g->error_cb_data;
603 guestfs_set_verbose (guestfs_h *g, int v)
610 guestfs_get_verbose (guestfs_h *g)
616 guestfs_set_autosync (guestfs_h *g, int a)
623 guestfs_get_autosync (guestfs_h *g)
629 guestfs_set_path (guestfs_h *g, const char *path)
636 safe_strdup (g, GUESTFS_DEFAULT_PATH) : safe_strdup (g, path);
641 guestfs_get_path (guestfs_h *g)
647 guestfs_set_qemu (guestfs_h *g, const char *qemu)
652 g->qemu = qemu == NULL ? safe_strdup (g, QEMU) : safe_strdup (g, qemu);
657 guestfs_get_qemu (guestfs_h *g)
663 guestfs_set_append (guestfs_h *g, const char *append)
668 g->append = append ? safe_strdup (g, append) : NULL;
673 guestfs_get_append (guestfs_h *g)
679 guestfs_set_memsize (guestfs_h *g, int memsize)
681 g->memsize = memsize;
686 guestfs_get_memsize (guestfs_h *g)
692 guestfs_get_pid (guestfs_h *g)
697 error (g, "get_pid: no qemu subprocess");
702 struct guestfs_version *
703 guestfs_version (guestfs_h *g)
705 struct guestfs_version *r;
707 r = safe_malloc (g, sizeof *r);
708 r->major = PACKAGE_VERSION_MAJOR;
709 r->minor = PACKAGE_VERSION_MINOR;
710 r->release = PACKAGE_VERSION_RELEASE;
711 r->extra = safe_strdup (g, PACKAGE_VERSION_EXTRA);
715 /* Add a string to the current command line. */
717 incr_cmdline_size (guestfs_h *g)
719 if (g->cmdline == NULL) {
720 /* g->cmdline[0] is reserved for argv[0], set in guestfs_launch. */
722 g->cmdline = safe_malloc (g, sizeof (char *));
723 g->cmdline[0] = NULL;
727 g->cmdline = safe_realloc (g, g->cmdline, sizeof (char *) * g->cmdline_size);
731 add_cmdline (guestfs_h *g, const char *str)
733 if (g->state != CONFIG) {
735 _("command line cannot be altered after qemu subprocess launched"));
739 incr_cmdline_size (g);
740 g->cmdline[g->cmdline_size-1] = safe_strdup (g, str);
745 guestfs_config (guestfs_h *g,
746 const char *qemu_param, const char *qemu_value)
748 if (qemu_param[0] != '-') {
749 error (g, _("guestfs_config: parameter must begin with '-' character"));
753 /* A bit fascist, but the user will probably break the extra
754 * parameters that we add if they try to set any of these.
756 if (strcmp (qemu_param, "-kernel") == 0 ||
757 strcmp (qemu_param, "-initrd") == 0 ||
758 strcmp (qemu_param, "-nographic") == 0 ||
759 strcmp (qemu_param, "-serial") == 0 ||
760 strcmp (qemu_param, "-full-screen") == 0 ||
761 strcmp (qemu_param, "-std-vga") == 0 ||
762 strcmp (qemu_param, "-vnc") == 0) {
763 error (g, _("guestfs_config: parameter '%s' isn't allowed"), qemu_param);
767 if (add_cmdline (g, qemu_param) != 0) return -1;
769 if (qemu_value != NULL) {
770 if (add_cmdline (g, qemu_value) != 0) return -1;
777 guestfs_add_drive (guestfs_h *g, const char *filename)
779 size_t len = strlen (filename) + 64;
782 if (strchr (filename, ',') != NULL) {
783 error (g, _("filename cannot contain ',' (comma) character"));
787 if (access (filename, F_OK) == -1) {
788 perrorf (g, "%s", filename);
792 /* cache=off improves reliability in the event of a host crash. */
793 snprintf (buf, len, "file=%s,cache=off,if=%s", filename, DRIVE_IF);
795 return guestfs_config (g, "-drive", buf);
799 guestfs_add_drive_ro (guestfs_h *g, const char *filename)
801 size_t len = strlen (filename) + 64;
804 if (strchr (filename, ',') != NULL) {
805 error (g, _("filename cannot contain ',' (comma) character"));
809 if (access (filename, F_OK) == -1) {
810 perrorf (g, "%s", filename);
814 snprintf (buf, len, "file=%s,snapshot=on,if=%s", filename, DRIVE_IF);
816 return guestfs_config (g, "-drive", buf);
820 guestfs_add_cdrom (guestfs_h *g, const char *filename)
822 if (strchr (filename, ',') != NULL) {
823 error (g, _("filename cannot contain ',' (comma) character"));
827 if (access (filename, F_OK) == -1) {
828 perrorf (g, "%s", filename);
832 return guestfs_config (g, "-cdrom", filename);
835 /* Returns true iff file is contained in dir. */
837 dir_contains_file (const char *dir, const char *file)
839 int dirlen = strlen (dir);
840 int filelen = strlen (file);
841 int len = dirlen+filelen+2;
844 snprintf (path, len, "%s/%s", dir, file);
845 return access (path, F_OK) == 0;
848 /* Returns true iff every listed file is contained in 'dir'. */
850 dir_contains_files (const char *dir, ...)
855 va_start (args, dir);
856 while ((file = va_arg (args, const char *)) != NULL) {
857 if (!dir_contains_file (dir, file)) {
866 static int build_supermin_appliance (guestfs_h *g, const char *path, char **kernel, char **initrd);
867 static int test_qemu (guestfs_h *g);
868 static int qemu_supports (guestfs_h *g, const char *option);
870 static const char *kernel_name = "vmlinuz." REPO "." host_cpu;
871 static const char *initrd_name = "initramfs." REPO "." host_cpu ".img";
872 static const char *supermin_name =
873 "initramfs." REPO "." host_cpu ".supermin.img";
874 static const char *supermin_hostfiles_name =
875 "initramfs." REPO "." host_cpu ".supermin.hostfiles";
878 guestfs_launch (guestfs_h *g)
881 char dir_template[PATH_MAX];
886 char *path, *pelem, *pend;
887 char *kernel = NULL, *initrd = NULL;
889 struct sockaddr_un addr;
897 tmpdir = getenv ("TMPDIR") ? : tmpdir;
898 snprintf (dir_template, sizeof dir_template, "%s/libguestfsXXXXXX", tmpdir);
902 error (g, _("you must call guestfs_add_drive before guestfs_launch"));
906 if (g->state != CONFIG) {
907 error (g, _("qemu has already been launched"));
911 /* Make the temporary directory. */
913 g->tmpdir = safe_strdup (g, dir_template);
914 if (mkdtemp (g->tmpdir) == NULL) {
915 perrorf (g, _("%s: cannot create temporary directory"), dir_template);
920 /* First search g->path for the supermin appliance, and try to
921 * synthesize a kernel and initrd from that. If it fails, we
922 * try the path search again looking for a backup ordinary
925 pelem = path = safe_strdup (g, g->path);
927 pend = strchrnul (pelem, ':');
928 pmore = *pend == ':';
932 /* Empty element of "." means cwd. */
933 if (len == 0 || (len == 1 && *pelem == '.')) {
936 "looking for supermin appliance in current directory\n");
937 if (dir_contains_files (".",
938 supermin_name, supermin_hostfiles_name,
939 "kmod.whitelist", NULL)) {
940 if (build_supermin_appliance (g, ".", &kernel, &initrd) == -1)
945 /* Look at <path>/supermin* etc. */
948 fprintf (stderr, "looking for supermin appliance in %s\n", pelem);
950 if (dir_contains_files (pelem,
951 supermin_name, supermin_hostfiles_name,
952 "kmod.whitelist", NULL)) {
953 if (build_supermin_appliance (g, pelem, &kernel, &initrd) == -1)
964 if (kernel == NULL || initrd == NULL) {
965 /* Search g->path for the kernel and initrd. */
966 pelem = path = safe_strdup (g, g->path);
968 pend = strchrnul (pelem, ':');
969 pmore = *pend == ':';
973 /* Empty element or "." means cwd. */
974 if (len == 0 || (len == 1 && *pelem == '.')) {
977 "looking for appliance in current directory\n");
978 if (dir_contains_files (".", kernel_name, initrd_name, NULL)) {
979 kernel = safe_strdup (g, kernel_name);
980 initrd = safe_strdup (g, initrd_name);
984 /* Look at <path>/kernel etc. */
987 fprintf (stderr, "looking for appliance in %s\n", pelem);
989 if (dir_contains_files (pelem, kernel_name, initrd_name, NULL)) {
990 kernel = safe_malloc (g, len + strlen (kernel_name) + 2);
991 initrd = safe_malloc (g, len + strlen (initrd_name) + 2);
992 sprintf (kernel, "%s/%s", pelem, kernel_name);
993 sprintf (initrd, "%s/%s", pelem, initrd_name);
1004 if (kernel == NULL || initrd == NULL) {
1005 error (g, _("cannot find %s or %s on LIBGUESTFS_PATH (current path = %s)"),
1006 kernel_name, initrd_name, g->path);
1010 /* Get qemu help text and version. */
1011 if (test_qemu (g) == -1)
1014 /* Make the vmchannel socket. */
1015 snprintf (unixsock, sizeof unixsock, "%s/sock", g->tmpdir);
1018 if (pipe (wfd) == -1 || pipe (rfd) == -1) {
1019 perrorf (g, "pipe");
1025 perrorf (g, "fork");
1033 if (r == 0) { /* Child (qemu). */
1034 char vmchannel[256];
1036 char memsize_str[256];
1038 /* Set up the full command line. Do this in the subprocess so we
1039 * don't need to worry about cleaning up.
1041 g->cmdline[0] = g->qemu;
1043 #define LINUX_CMDLINE \
1044 "panic=1 " /* force kernel to panic if daemon exits */ \
1045 "console=ttyS0 " /* serial console */ \
1046 "udevtimeout=300 " /* good for very slow systems (RHBZ#480319) */ \
1047 "noapic " /* workaround for RHBZ#502058 - ok if not SMP */ \
1048 "acpi=off " /* we don't need ACPI, turn it off */ \
1049 "cgroup_disable=memory " /* saves us about 5 MB of RAM */ \
1050 "selinux=0 " /* SELinux is messed up if there's no policy */
1052 /* Linux kernel command line. */
1053 snprintf (append, sizeof append,
1054 LINUX_CMDLINE "guestfs=%s:%d%s%s%s",
1055 VMCHANNEL_ADDR, VMCHANNEL_PORT,
1056 g->verbose ? " guestfs_verbose=1" : "",
1057 g->append ? " " : "", g->append ? g->append : "");
1059 snprintf (memsize_str, sizeof memsize_str, "%d", g->memsize);
1061 add_cmdline (g, "-m");
1062 add_cmdline (g, memsize_str);
1063 add_cmdline (g, "-no-reboot"); /* Force exit instead of reboot on panic */
1064 add_cmdline (g, "-kernel");
1065 add_cmdline (g, (char *) kernel);
1066 add_cmdline (g, "-initrd");
1067 add_cmdline (g, (char *) initrd);
1068 add_cmdline (g, "-append");
1069 add_cmdline (g, append);
1070 add_cmdline (g, "-nographic");
1071 add_cmdline (g, "-serial");
1072 add_cmdline (g, "stdio");
1075 /* Doesn't work. See:
1076 * http://lists.gnu.org/archive/html/qemu-devel/2009-07/threads.html
1077 * Subject "guestfwd option doesn't allow supplementary ,server,nowait"
1079 if (qemu_supports (g, "guestfwd")) {
1080 /* New-style -net user,guestfwd=... syntax for vmchannel. See:
1081 * http://git.savannah.gnu.org/cgit/qemu.git/commit/?id=c92ef6a22d3c71538fcc48fb61ad353f7ba03b62
1083 snprintf (vmchannel, sizeof vmchannel,
1084 "user,vlan=0,net=10.0.2.0/8,guestfwd=tcp:%s:%d-unix:%s,server,nowait",
1085 VMCHANNEL_ADDR, VMCHANNEL_PORT, unixsock);
1087 add_cmdline (g, "-net");
1088 add_cmdline (g, vmchannel);
1091 /* Not guestfwd. HOPEFULLY this qemu uses the older -net channel
1092 * syntax, or if not then we'll get a quick failure.
1094 snprintf (vmchannel, sizeof vmchannel,
1095 "channel,%d:unix:%s,server,nowait",
1096 VMCHANNEL_PORT, unixsock);
1098 add_cmdline (g, "-net");
1099 add_cmdline (g, vmchannel);
1100 add_cmdline (g, "-net");
1101 add_cmdline (g, "user,vlan=0,net=10.0.2.0/8");
1105 add_cmdline (g, "-net");
1106 add_cmdline (g, "nic,model=virtio,vlan=0");
1108 /* These options recommended by KVM developers to improve reliability. */
1109 if (qemu_supports (g, "-no-hpet"))
1110 add_cmdline (g, "-no-hpet");
1112 if (qemu_supports (g, "-rtc-td-hack"))
1113 add_cmdline (g, "-rtc-td-hack");
1115 /* Finish off the command line. */
1116 incr_cmdline_size (g);
1117 g->cmdline[g->cmdline_size-1] = NULL;
1120 fprintf (stderr, "%s", g->qemu);
1121 for (i = 0; g->cmdline[i]; ++i)
1122 fprintf (stderr, " %s", g->cmdline[i]);
1123 fprintf (stderr, "\n");
1126 /* Set up stdin, stdout. */
1137 /* Set up a new process group, so we can signal this process
1138 * and all subprocesses (eg. if qemu is really a shell script).
1143 execv (g->qemu, g->cmdline); /* Run qemu. */
1148 /* Parent (library). */
1156 /* Fork the recovery process off which will kill qemu if the parent
1157 * process fails to do so (eg. if the parent segfaults).
1161 pid_t qemu_pid = g->pid;
1162 pid_t parent_pid = getppid ();
1164 /* Writing to argv is hideously complicated and error prone. See:
1165 * http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/ps_status.c?rev=1.33.2.1;content-type=text%2Fplain
1168 /* Loop around waiting for one or both of the other processes to
1169 * disappear. It's fair to say this is very hairy. The PIDs that
1170 * we are looking at might be reused by another process. We are
1171 * effectively polling. Is the cure worse than the disease?
1174 if (kill (qemu_pid, 0) == -1) /* qemu's gone away, we aren't needed */
1176 if (kill (parent_pid, 0) == -1) {
1177 /* Parent's gone away, qemu still around, so kill qemu. */
1185 /* Don't worry, if the fork failed, this will be -1. The recovery
1186 * process isn't essential.
1190 /* Start the clock ... */
1193 /* Close the other ends of the pipe. */
1197 if (fcntl (wfd[1], F_SETFL, O_NONBLOCK) == -1 ||
1198 fcntl (rfd[0], F_SETFL, O_NONBLOCK) == -1) {
1199 perrorf (g, "fcntl");
1203 g->fd[0] = wfd[1]; /* stdin of child */
1204 g->fd[1] = rfd[0]; /* stdout of child */
1206 /* Open the Unix socket. The vmchannel implementation that got
1207 * merged with qemu sucks in a number of ways. Both ends do
1208 * connect(2), which means that no one knows what, if anything, is
1209 * connected to the other end, or if it becomes disconnected. Even
1210 * worse, we have to wait some indeterminate time for qemu to create
1211 * the socket and connect to it (which happens very early in qemu's
1212 * start-up), so any code that uses vmchannel is inherently racy.
1213 * Hence this silly loop.
1215 g->sock = socket (AF_UNIX, SOCK_STREAM, 0);
1216 if (g->sock == -1) {
1217 perrorf (g, "socket");
1221 if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
1222 perrorf (g, "fcntl");
1226 addr.sun_family = AF_UNIX;
1227 strncpy (addr.sun_path, unixsock, UNIX_PATH_MAX);
1228 addr.sun_path[UNIX_PATH_MAX-1] = '\0';
1231 /* Always sleep at least once to give qemu a small chance to start up. */
1234 r = connect (g->sock, (struct sockaddr *) &addr, sizeof addr);
1235 if ((r == -1 && errno == EINPROGRESS) || r == 0)
1238 if (errno != ENOENT)
1239 perrorf (g, "connect");
1244 error (g, _("failed to connect to vmchannel socket"));
1248 /* Watch the file descriptors. */
1251 g->msg_in_size = g->msg_in_allocated = 0;
1255 g->msg_out_size = 0;
1259 g->main_loop->add_handle (g->main_loop, g, g->fd[1],
1260 GUESTFS_HANDLE_READABLE,
1261 stdout_event, NULL);
1262 if (g->stdout_watch == -1) {
1263 error (g, _("could not watch qemu stdout"));
1267 if (guestfs__switch_to_receiving (g) == -1)
1270 g->state = LAUNCHING;
1274 if (g->stdout_watch >= 0)
1275 g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
1276 if (g->sock_watch >= 0)
1277 g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
1286 if (g->recoverypid > 0) kill (g->recoverypid, 9);
1287 waitpid (g->pid, NULL, 0);
1288 if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
1295 g->stdout_watch = -1;
1304 /* This function does the hard work of building the supermin appliance
1305 * on the fly. 'path' is the directory containing the control files.
1306 * 'kernel' and 'initrd' are where we will return the names of the
1307 * kernel and initrd (only initrd is built). The work is done by
1308 * an external script. We just tell it where to put the result.
1311 build_supermin_appliance (guestfs_h *g, const char *path,
1312 char **kernel, char **initrd)
1317 len = strlen (g->tmpdir);
1318 *kernel = safe_malloc (g, len + 8);
1319 snprintf (*kernel, len+8, "%s/kernel", g->tmpdir);
1320 *initrd = safe_malloc (g, len + 8);
1321 snprintf (*initrd, len+8, "%s/initrd", g->tmpdir);
1323 snprintf (cmd, sizeof cmd,
1325 "libguestfs-supermin-helper '%s' %s %s",
1327 path, *kernel, *initrd);
1330 if (r == -1 || WEXITSTATUS(r) != 0) {
1331 error (g, _("external command failed: %s"), cmd);
1334 *kernel = *initrd = NULL;
1341 static int read_all (guestfs_h *g, FILE *fp, char **ret);
1343 /* Test qemu binary (or wrapper) runs, and do 'qemu -help' and
1344 * 'qemu -version' so we know what options this qemu supports and
1348 test_qemu (guestfs_h *g)
1353 free (g->qemu_help);
1354 free (g->qemu_version);
1355 g->qemu_help = NULL;
1356 g->qemu_version = NULL;
1358 snprintf (cmd, sizeof cmd, "'%s' -help", g->qemu);
1360 fp = popen (cmd, "r");
1361 /* qemu -help should always work (qemu -version OTOH wasn't
1362 * supported by qemu 0.9). If this command doesn't work then it
1363 * probably indicates that the qemu binary is missing.
1366 /* XXX This error is never printed, even if the qemu binary
1367 * doesn't exist. Why?
1370 perrorf (g, _("%s: command failed: If qemu is located on a non-standard path, try setting the LIBGUESTFS_QEMU environment variable."), cmd);
1374 if (read_all (g, fp, &g->qemu_help) == -1)
1377 if (pclose (fp) == -1)
1380 snprintf (cmd, sizeof cmd, "'%s' -version 2>/dev/null", g->qemu);
1382 fp = popen (cmd, "r");
1384 /* Intentionally ignore errors. */
1385 read_all (g, fp, &g->qemu_version);
1393 read_all (guestfs_h *g, FILE *fp, char **ret)
1400 *ret = safe_realloc (g, *ret, n + 1);
1405 *ret = safe_realloc (g, *ret, n + BUFSIZ);
1407 r = fread (p, 1, BUFSIZ, fp);
1409 perrorf (g, "read");
1416 /* Test if option is supported by qemu command line (just by grepping
1420 qemu_supports (guestfs_h *g, const char *option)
1422 return g->qemu_help && strstr (g->qemu_help, option) != NULL;
1426 finish_wait_ready (guestfs_h *g, void *vp)
1429 fprintf (stderr, "finish_wait_ready called, %p, vp = %p\n", g, vp);
1432 g->main_loop->main_loop_quit (g->main_loop, g);
1436 guestfs_wait_ready (guestfs_h *g)
1438 int finished = 0, r;
1440 if (g->state == READY) return 0;
1442 if (g->state == BUSY) {
1443 error (g, _("qemu has finished launching already"));
1447 if (g->state != LAUNCHING) {
1448 error (g, _("qemu has not been launched yet"));
1452 g->launch_done_cb = finish_wait_ready;
1453 g->launch_done_cb_data = &finished;
1454 r = g->main_loop->main_loop_run (g->main_loop, g);
1455 g->launch_done_cb = NULL;
1456 g->launch_done_cb_data = NULL;
1458 if (r == -1) return -1;
1460 if (finished != 1) {
1461 error (g, _("guestfs_wait_ready failed, see earlier error messages"));
1465 /* This is possible in some really strange situations, such as
1466 * guestfsd starts up OK but then qemu immediately exits. Check for
1467 * it because the caller is probably expecting to be able to send
1468 * commands after this function returns.
1470 if (g->state != READY) {
1471 error (g, _("qemu launched and contacted daemon, but state != READY"));
1479 guestfs_kill_subprocess (guestfs_h *g)
1481 if (g->state == CONFIG) {
1482 error (g, _("no subprocess to kill"));
1487 fprintf (stderr, "sending SIGTERM to process %d\n", g->pid);
1489 kill (g->pid, SIGTERM);
1490 if (g->recoverypid > 0) kill (g->recoverypid, 9);
1495 /* Access current state. */
1497 guestfs_is_config (guestfs_h *g)
1499 return g->state == CONFIG;
1503 guestfs_is_launching (guestfs_h *g)
1505 return g->state == LAUNCHING;
1509 guestfs_is_ready (guestfs_h *g)
1511 return g->state == READY;
1515 guestfs_is_busy (guestfs_h *g)
1517 return g->state == BUSY;
1521 guestfs_get_state (guestfs_h *g)
1527 guestfs_set_ready (guestfs_h *g)
1529 if (g->state != BUSY) {
1530 error (g, _("guestfs_set_ready: called when in state %d != BUSY"),
1539 guestfs_set_busy (guestfs_h *g)
1541 if (g->state != READY) {
1542 error (g, _("guestfs_set_busy: called when in state %d != READY"),
1551 guestfs_end_busy (guestfs_h *g)
1563 error (g, _("guestfs_end_busy: called when in state %d"), g->state);
1569 /* We don't know if stdout_event or sock_read_event will be the
1570 * first to receive EOF if the qemu process dies. This function
1571 * has the common cleanup code for both.
1574 child_cleanup (guestfs_h *g)
1577 fprintf (stderr, "stdout_event: %p: child process died\n", g);
1578 /*kill (g->pid, SIGTERM);*/
1579 if (g->recoverypid > 0) kill (g->recoverypid, 9);
1580 waitpid (g->pid, NULL, 0);
1581 if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
1582 if (g->stdout_watch >= 0)
1583 g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
1584 if (g->sock_watch >= 0)
1585 g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
1595 g->stdout_watch = -1;
1598 if (g->subprocess_quit_cb)
1599 g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
1602 /* This function is called whenever qemu prints something on stdout.
1603 * Qemu's stdout is also connected to the guest's serial console, so
1604 * we see kernel messages here too.
1607 stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
1608 int watch, int fd, int events)
1616 "stdout_event: %p g->state = %d, fd = %d, events = 0x%x\n",
1617 g, g->state, fd, events);
1620 if (g->fd[1] != fd) {
1621 error (g, _("stdout_event: internal error: %d != %d"), g->fd[1], fd);
1625 n = read (fd, buf, sizeof buf);
1627 /* Hopefully this indicates the qemu child process has died. */
1633 if (errno != EINTR && errno != EAGAIN)
1634 perrorf (g, "read");
1638 /* In verbose mode, copy all log messages to stderr. */
1642 /* It's an actual log message, send it upwards if anyone is listening. */
1643 if (g->log_message_cb)
1644 g->log_message_cb (g, g->log_message_cb_data, buf, n);
1647 /* The function is called whenever we can read something on the
1648 * guestfsd (daemon inside the guest) communication socket.
1651 sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
1652 int watch, int fd, int events)
1660 "sock_read_event: %p g->state = %d, fd = %d, events = 0x%x\n",
1661 g, g->state, fd, events);
1663 if (g->sock != fd) {
1664 error (g, _("sock_read_event: internal error: %d != %d"), g->sock, fd);
1668 if (g->msg_in_size <= g->msg_in_allocated) {
1669 g->msg_in_allocated += 4096;
1670 g->msg_in = safe_realloc (g, g->msg_in, g->msg_in_allocated);
1672 n = read (g->sock, g->msg_in + g->msg_in_size,
1673 g->msg_in_allocated - g->msg_in_size);
1681 if (errno != EINTR && errno != EAGAIN)
1682 perrorf (g, "read");
1686 g->msg_in_size += n;
1688 /* Have we got enough of a message to be able to process it yet? */
1690 if (g->msg_in_size < 4) return;
1692 xdrmem_create (&xdr, g->msg_in, g->msg_in_size, XDR_DECODE);
1693 if (!xdr_uint32_t (&xdr, &len)) {
1694 error (g, _("can't decode length word"));
1698 /* Length is normally the length of the message, but when guestfsd
1699 * starts up it sends a "magic" value (longer than any possible
1700 * message). Check for this.
1702 if (len == GUESTFS_LAUNCH_FLAG) {
1703 if (g->state != LAUNCHING)
1704 error (g, _("received magic signature from guestfsd, but in state %d"),
1706 else if (g->msg_in_size != 4)
1707 error (g, _("received magic signature from guestfsd, but msg size is %d"),
1711 if (g->launch_done_cb)
1712 g->launch_done_cb (g, g->launch_done_cb_data);
1718 /* This can happen if a cancellation happens right at the end
1719 * of us sending a FileIn parameter to the daemon. Discard. The
1720 * daemon should send us an error message next.
1722 if (len == GUESTFS_CANCEL_FLAG) {
1723 g->msg_in_size -= 4;
1724 memmove (g->msg_in, g->msg_in+4, g->msg_in_size);
1728 /* If this happens, it's pretty bad and we've probably lost
1731 if (len > GUESTFS_MESSAGE_MAX) {
1732 error (g, _("message length (%u) > maximum possible size (%d)"),
1733 len, GUESTFS_MESSAGE_MAX);
1737 if (g->msg_in_size-4 < len) return; /* Need more of this message. */
1739 /* Got the full message, begin processing it. */
1744 for (i = 0; i < g->msg_in_size; i += 16) {
1745 printf ("%04x: ", i);
1746 for (j = i; j < MIN (i+16, g->msg_in_size); ++j)
1747 printf ("%02x ", (unsigned char) g->msg_in[j]);
1748 for (; j < i+16; ++j)
1751 for (j = i; j < MIN (i+16, g->msg_in_size); ++j)
1752 if (isprint (g->msg_in[j]))
1753 printf ("%c", g->msg_in[j]);
1756 for (; j < i+16; ++j)
1763 /* Not in the expected state. */
1764 if (g->state != BUSY)
1765 error (g, _("state %d != BUSY"), g->state);
1767 /* Push the message up to the higher layer. */
1769 g->reply_cb (g, g->reply_cb_data, &xdr);
1771 /* This message (probably) should never be printed. */
1772 fprintf (stderr, "libguesfs: sock_read_event: !!! dropped message !!!\n");
1774 g->msg_in_size -= len + 4;
1775 memmove (g->msg_in, g->msg_in+len+4, g->msg_in_size);
1776 if (g->msg_in_size > 0) goto again;
1779 /* Free the message buffer if it's grown excessively large. */
1780 if (g->msg_in_allocated > 65536) {
1783 g->msg_in_size = g->msg_in_allocated = 0;
1790 /* The function is called whenever we can write something on the
1791 * guestfsd (daemon inside the guest) communication socket.
1794 sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
1795 int watch, int fd, int events)
1801 "sock_write_event: %p g->state = %d, fd = %d, events = 0x%x\n",
1802 g, g->state, fd, events);
1804 if (g->sock != fd) {
1805 error (g, _("sock_write_event: internal error: %d != %d"), g->sock, fd);
1809 if (g->state != BUSY) {
1810 error (g, _("sock_write_event: state %d != BUSY"), g->state);
1815 fprintf (stderr, "sock_write_event: writing %d bytes ...\n",
1816 g->msg_out_size - g->msg_out_pos);
1818 n = write (g->sock, g->msg_out + g->msg_out_pos,
1819 g->msg_out_size - g->msg_out_pos);
1823 perrorf (g, "write");
1824 if (err == EPIPE) /* Disconnected from guest (RHBZ#508713). */
1830 fprintf (stderr, "sock_write_event: wrote %d bytes\n", n);
1832 g->msg_out_pos += n;
1834 /* More to write? */
1835 if (g->msg_out_pos < g->msg_out_size)
1839 fprintf (stderr, "sock_write_event: done writing, calling send_cb\n");
1843 g->msg_out_pos = g->msg_out_size = 0;
1845 /* Done writing, call the higher layer. */
1847 g->send_cb (g, g->send_cb_data);
1851 guestfs_set_send_callback (guestfs_h *g,
1852 guestfs_send_cb cb, void *opaque)
1855 g->send_cb_data = opaque;
1859 guestfs_set_reply_callback (guestfs_h *g,
1860 guestfs_reply_cb cb, void *opaque)
1863 g->reply_cb_data = opaque;
1867 guestfs_set_log_message_callback (guestfs_h *g,
1868 guestfs_log_message_cb cb, void *opaque)
1870 g->log_message_cb = cb;
1871 g->log_message_cb_data = opaque;
1875 guestfs_set_subprocess_quit_callback (guestfs_h *g,
1876 guestfs_subprocess_quit_cb cb, void *opaque)
1878 g->subprocess_quit_cb = cb;
1879 g->subprocess_quit_cb_data = opaque;
1883 guestfs_set_launch_done_callback (guestfs_h *g,
1884 guestfs_launch_done_cb cb, void *opaque)
1886 g->launch_done_cb = cb;
1887 g->launch_done_cb_data = opaque;
1890 /* Access to the handle's main loop and the default main loop. */
1892 guestfs_set_main_loop (guestfs_h *g, guestfs_main_loop *main_loop)
1894 g->main_loop = main_loop;
1898 guestfs_get_main_loop (guestfs_h *g)
1900 return g->main_loop;
1904 guestfs_get_default_main_loop (void)
1906 return (guestfs_main_loop *) &default_main_loop;
1909 /* Change the daemon socket handler so that we are now writing.
1910 * This sets the handle to sock_write_event.
1913 guestfs__switch_to_sending (guestfs_h *g)
1915 if (g->sock_watch >= 0) {
1916 if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
1917 error (g, _("remove_handle failed"));
1924 g->main_loop->add_handle (g->main_loop, g, g->sock,
1925 GUESTFS_HANDLE_WRITABLE,
1926 sock_write_event, NULL);
1927 if (g->sock_watch == -1) {
1928 error (g, _("add_handle failed"));
1936 guestfs__switch_to_receiving (guestfs_h *g)
1938 if (g->sock_watch >= 0) {
1939 if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
1940 error (g, _("remove_handle failed"));
1947 g->main_loop->add_handle (g->main_loop, g, g->sock,
1948 GUESTFS_HANDLE_READABLE,
1949 sock_read_event, NULL);
1950 if (g->sock_watch == -1) {
1951 error (g, _("add_handle failed"));
1958 /* Dispatch a call (len + header + args) to the remote daemon,
1959 * synchronously (ie. using the guest's main loop to wait until
1960 * it has been sent). Returns -1 for error, or the serial
1961 * number of the message.
1964 send_cb (guestfs_h *g, void *data)
1966 guestfs_main_loop *ml = guestfs_get_main_loop (g);
1969 ml->main_loop_quit (ml, g);
1973 guestfs__send_sync (guestfs_h *g, int proc_nr,
1974 xdrproc_t xdrp, char *args)
1976 struct guestfs_message_header hdr;
1979 int serial = g->msg_next_serial++;
1981 guestfs_main_loop *ml = guestfs_get_main_loop (g);
1983 if (g->state != BUSY) {
1984 error (g, _("guestfs__send_sync: state %d != BUSY"), g->state);
1988 /* This is probably an internal error. Or perhaps we should just
1989 * free the buffer anyway?
1991 if (g->msg_out != NULL) {
1992 error (g, _("guestfs__send_sync: msg_out should be NULL"));
1996 /* We have to allocate this message buffer on the heap because
1997 * it is quite large (although will be mostly unused). We
1998 * can't allocate it on the stack because in some environments
1999 * we have quite limited stack space available, notably when
2000 * running in the JVM.
2002 g->msg_out = safe_malloc (g, GUESTFS_MESSAGE_MAX + 4);
2003 xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MESSAGE_MAX, XDR_ENCODE);
2005 /* Serialize the header. */
2006 hdr.prog = GUESTFS_PROGRAM;
2007 hdr.vers = GUESTFS_PROTOCOL_VERSION;
2009 hdr.direction = GUESTFS_DIRECTION_CALL;
2010 hdr.serial = serial;
2011 hdr.status = GUESTFS_STATUS_OK;
2013 if (!xdr_guestfs_message_header (&xdr, &hdr)) {
2014 error (g, _("xdr_guestfs_message_header failed"));
2018 /* Serialize the args. If any, because some message types
2019 * have no parameters.
2022 if (!(*xdrp) (&xdr, args)) {
2023 error (g, _("dispatch failed to marshal args"));
2028 /* Get the actual length of the message, resize the buffer to match
2029 * the actual length, and write the length word at the beginning.
2031 len = xdr_getpos (&xdr);
2034 g->msg_out = safe_realloc (g, g->msg_out, len + 4);
2035 g->msg_out_size = len + 4;
2038 xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
2039 xdr_uint32_t (&xdr, &len);
2041 if (guestfs__switch_to_sending (g) == -1)
2045 guestfs_set_send_callback (g, send_cb, &sent);
2046 if (ml->main_loop_run (ml, g) == -1)
2049 error (g, _("send failed, see earlier error messages"));
2058 g->msg_out_size = 0;
2062 static int cancel = 0; /* XXX Implement file cancellation. */
2063 static int send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t len);
2064 static int send_file_data_sync (guestfs_h *g, const char *buf, size_t len);
2065 static int send_file_cancellation_sync (guestfs_h *g);
2066 static int send_file_complete_sync (guestfs_h *g);
2068 /* Synchronously send a file.
2072 * -2 daemon cancelled (we must read the error message)
2075 guestfs__send_file_sync (guestfs_h *g, const char *filename)
2077 char buf[GUESTFS_MAX_CHUNK_SIZE];
2080 fd = open (filename, O_RDONLY);
2082 perrorf (g, "open: %s", filename);
2083 send_file_cancellation_sync (g);
2084 /* Daemon sees cancellation and won't reply, so caller can
2090 /* Send file in chunked encoding. */
2092 r = read (fd, buf, sizeof buf);
2093 if (r == -1 && (errno == EINTR || errno == EAGAIN))
2096 err = send_file_data_sync (g, buf, r);
2098 if (err == -2) /* daemon sent cancellation */
2099 send_file_cancellation_sync (g);
2104 if (cancel) { /* cancel from either end */
2105 send_file_cancellation_sync (g);
2110 perrorf (g, "read: %s", filename);
2111 send_file_cancellation_sync (g);
2115 /* End of file, but before we send that, we need to close
2116 * the file and check for errors.
2118 if (close (fd) == -1) {
2119 perrorf (g, "close: %s", filename);
2120 send_file_cancellation_sync (g);
2124 return send_file_complete_sync (g);
2127 /* Send a chunk of file data. */
2129 send_file_data_sync (guestfs_h *g, const char *buf, size_t len)
2131 return send_file_chunk_sync (g, 0, buf, len);
2134 /* Send a cancellation message. */
2136 send_file_cancellation_sync (guestfs_h *g)
2138 return send_file_chunk_sync (g, 1, NULL, 0);
2141 /* Send a file complete chunk. */
2143 send_file_complete_sync (guestfs_h *g)
2146 return send_file_chunk_sync (g, 0, buf, 0);
2149 /* Send a chunk, cancellation or end of file, synchronously (ie. wait
2152 static int check_for_daemon_cancellation (guestfs_h *g);
2155 send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t buflen)
2159 guestfs_chunk chunk;
2161 guestfs_main_loop *ml = guestfs_get_main_loop (g);
2163 if (g->state != BUSY) {
2164 error (g, _("send_file_chunk_sync: state %d != READY"), g->state);
2168 /* This is probably an internal error. Or perhaps we should just
2169 * free the buffer anyway?
2171 if (g->msg_out != NULL) {
2172 error (g, _("guestfs__send_sync: msg_out should be NULL"));
2176 /* Did the daemon send a cancellation message? */
2177 if (check_for_daemon_cancellation (g)) {
2179 fprintf (stderr, "got daemon cancellation\n");
2183 /* Allocate the chunk buffer. Don't use the stack to avoid
2184 * excessive stack usage and unnecessary copies.
2186 g->msg_out = safe_malloc (g, GUESTFS_MAX_CHUNK_SIZE + 4 + 48);
2187 xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MAX_CHUNK_SIZE + 48, XDR_ENCODE);
2189 /* Serialize the chunk. */
2190 chunk.cancel = cancel;
2191 chunk.data.data_len = buflen;
2192 chunk.data.data_val = (char *) buf;
2194 if (!xdr_guestfs_chunk (&xdr, &chunk)) {
2195 error (g, _("xdr_guestfs_chunk failed (buf = %p, buflen = %zu)"),
2201 len = xdr_getpos (&xdr);
2204 /* Reduce the size of the outgoing message buffer to the real length. */
2205 g->msg_out = safe_realloc (g, g->msg_out, len + 4);
2206 g->msg_out_size = len + 4;
2209 xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
2210 xdr_uint32_t (&xdr, &len);
2212 if (guestfs__switch_to_sending (g) == -1)
2216 guestfs_set_send_callback (g, send_cb, &sent);
2217 if (ml->main_loop_run (ml, g) == -1)
2220 error (g, _("send file chunk failed, see earlier error messages"));
2229 g->msg_out_size = 0;
2233 /* At this point we are sending FileIn file(s) to the guest, and not
2234 * expecting to read anything, so if we do read anything, it must be
2235 * a cancellation message. This checks for this case without blocking.
2238 check_for_daemon_cancellation (guestfs_h *g)
2248 FD_SET (g->sock, &rset);
2251 r = select (g->sock+1, &rset, NULL, NULL, &tv);
2253 perrorf (g, "select");
2259 /* Read the message from the daemon. */
2260 r = xread (g->sock, buf, sizeof buf);
2262 perrorf (g, "read");
2266 xdrmem_create (&xdr, buf, sizeof buf, XDR_DECODE);
2267 xdr_uint32_t (&xdr, &flag);
2270 if (flag != GUESTFS_CANCEL_FLAG) {
2271 error (g, _("check_for_daemon_cancellation: read 0x%x from daemon, expected 0x%x\n"),
2272 flag, GUESTFS_CANCEL_FLAG);
2279 /* Synchronously receive a file. */
2281 /* Returns -1 = error, 0 = EOF, 1 = more data */
2282 static int receive_file_data_sync (guestfs_h *g, void **buf, size_t *len);
2285 guestfs__receive_file_sync (guestfs_h *g, const char *filename)
2291 fd = open (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0666);
2293 perrorf (g, "open: %s", filename);
2297 /* Receive the file in chunked encoding. */
2298 while ((r = receive_file_data_sync (g, &buf, &len)) >= 0) {
2299 if (xwrite (fd, buf, len) == -1) {
2300 perrorf (g, "%s: write", filename);
2305 if (r == 0) break; /* End of file. */
2309 error (g, _("%s: error in chunked encoding"), filename);
2313 if (close (fd) == -1) {
2314 perrorf (g, "close: %s", filename);
2321 /* Send cancellation message to daemon, then wait until it
2322 * cancels (just throwing away data).
2326 uint32_t flag = GUESTFS_CANCEL_FLAG;
2329 fprintf (stderr, "%s: waiting for daemon to acknowledge cancellation\n",
2332 xdrmem_create (&xdr, fbuf, sizeof fbuf, XDR_ENCODE);
2333 xdr_uint32_t (&xdr, &flag);
2336 if (xwrite (g->sock, fbuf, sizeof fbuf) == -1) {
2337 perrorf (g, _("write to daemon socket"));
2341 while ((r = receive_file_data_sync (g, NULL, NULL)) > 0)
2342 ; /* just discard it */
2347 /* Note that the reply callback can be called multiple times before
2348 * the main loop quits and we get back to the synchronous code. So
2349 * we have to be prepared to save multiple chunks on a list here.
2351 struct receive_file_ctx {
2352 int count; /* 0 if receive_file_cb not called, or
2353 * else count number of chunks.
2355 guestfs_chunk *chunks; /* Array of chunks. */
2359 free_chunks (struct receive_file_ctx *ctx)
2363 for (i = 0; i < ctx->count; ++i)
2364 free (ctx->chunks[i].data.data_val);
2370 receive_file_cb (guestfs_h *g, void *data, XDR *xdr)
2372 guestfs_main_loop *ml = guestfs_get_main_loop (g);
2373 struct receive_file_ctx *ctx = (struct receive_file_ctx *) data;
2374 guestfs_chunk chunk;
2376 if (ctx->count == -1) /* Parse error occurred previously. */
2379 ml->main_loop_quit (ml, g);
2381 memset (&chunk, 0, sizeof chunk);
2383 if (!xdr_guestfs_chunk (xdr, &chunk)) {
2384 error (g, _("failed to parse file chunk"));
2391 /* Copy the chunk to the list. */
2392 ctx->chunks = safe_realloc (g, ctx->chunks,
2393 sizeof (guestfs_chunk) * (ctx->count+1));
2394 ctx->chunks[ctx->count] = chunk;
2398 /* Receive a chunk of file data. */
2399 /* Returns -1 = error, 0 = EOF, 1 = more data */
2401 receive_file_data_sync (guestfs_h *g, void **buf, size_t *len_r)
2403 struct receive_file_ctx ctx;
2404 guestfs_main_loop *ml = guestfs_get_main_loop (g);
2411 guestfs_set_reply_callback (g, receive_file_cb, &ctx);
2412 (void) ml->main_loop_run (ml, g);
2413 guestfs_set_reply_callback (g, NULL, NULL);
2415 if (ctx.count == 0) {
2416 error (g, _("receive_file_data_sync: reply callback not called\n"));
2420 if (ctx.count == -1) {
2421 error (g, _("receive_file_data_sync: parse error in reply callback\n"));
2422 /* callback already freed the chunks */
2427 fprintf (stderr, "receive_file_data_sync: got %d chunks\n", ctx.count);
2429 /* Process each chunk in the list. */
2430 if (buf) *buf = NULL; /* Accumulate data in this buffer. */
2433 for (i = 0; i < ctx.count; ++i) {
2434 if (ctx.chunks[i].cancel) {
2435 error (g, _("file receive cancelled by daemon"));
2437 if (buf) free (*buf);
2438 if (len_r) *len_r = 0;
2442 if (ctx.chunks[i].data.data_len == 0) { /* end of transfer */
2444 if (len_r) *len_r = len;
2449 *buf = safe_realloc (g, *buf, len + ctx.chunks[i].data.data_len);
2450 memcpy (*buf+len, ctx.chunks[i].data.data_val,
2451 ctx.chunks[i].data.data_len);
2453 len += ctx.chunks[i].data.data_len;
2456 if (len_r) *len_r = len;
2461 /* This is the default main loop implementation, using select(2). */
2464 select_add_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd, int events,
2465 guestfs_handle_event_cb cb, void *data)
2467 struct select_main_loop *ml = (struct select_main_loop *) mlv;
2469 if (fd < 0 || fd >= FD_SETSIZE) {
2470 error (g, _("fd %d is out of range"), fd);
2474 if ((events & ~(GUESTFS_HANDLE_READABLE |
2475 GUESTFS_HANDLE_WRITABLE |
2476 GUESTFS_HANDLE_HANGUP |
2477 GUESTFS_HANDLE_ERROR)) != 0) {
2478 error (g, _("set of events (0x%x) contains unknown events"), events);
2483 error (g, _("set of events is empty"));
2487 if (FD_ISSET (fd, &ml->rset) ||
2488 FD_ISSET (fd, &ml->wset) ||
2489 FD_ISSET (fd, &ml->xset)) {
2490 error (g, _("fd %d is already registered"), fd);
2495 error (g, _("callback is NULL"));
2499 if ((events & GUESTFS_HANDLE_READABLE))
2500 FD_SET (fd, &ml->rset);
2501 if ((events & GUESTFS_HANDLE_WRITABLE))
2502 FD_SET (fd, &ml->wset);
2503 if ((events & GUESTFS_HANDLE_HANGUP) || (events & GUESTFS_HANDLE_ERROR))
2504 FD_SET (fd, &ml->xset);
2506 if (fd > ml->max_fd) {
2508 ml->handle_cb_data =
2509 safe_realloc (g, ml->handle_cb_data,
2510 sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
2512 ml->handle_cb_data[fd].cb = cb;
2513 ml->handle_cb_data[fd].g = g;
2514 ml->handle_cb_data[fd].data = data;
2518 /* Any integer >= 0 can be the handle, and this is as good as any ... */
2523 select_remove_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd)
2525 struct select_main_loop *ml = (struct select_main_loop *) mlv;
2527 if (fd < 0 || fd >= FD_SETSIZE) {
2528 error (g, _("fd %d is out of range"), fd);
2532 if (!FD_ISSET (fd, &ml->rset) &&
2533 !FD_ISSET (fd, &ml->wset) &&
2534 !FD_ISSET (fd, &ml->xset)) {
2535 error (g, _("fd %d was not registered"), fd);
2539 FD_CLR (fd, &ml->rset);
2540 FD_CLR (fd, &ml->wset);
2541 FD_CLR (fd, &ml->xset);
2543 if (fd == ml->max_fd) {
2545 ml->handle_cb_data =
2546 safe_realloc (g, ml->handle_cb_data,
2547 sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
2556 select_add_timeout (guestfs_main_loop *mlv, guestfs_h *g, int interval,
2557 guestfs_handle_timeout_cb cb, void *data)
2559 //struct select_main_loop *ml = (struct select_main_loop *) mlv;
2561 abort (); /* XXX not implemented yet */
2565 select_remove_timeout (guestfs_main_loop *mlv, guestfs_h *g, int timer)
2567 //struct select_main_loop *ml = (struct select_main_loop *) mlv;
2569 abort (); /* XXX not implemented yet */
2572 /* The 'g' parameter is just used for error reporting. Events
2573 * for multiple handles can be dispatched by running the main
2577 select_main_loop_run (guestfs_main_loop *mlv, guestfs_h *g)
2579 struct select_main_loop *ml = (struct select_main_loop *) mlv;
2581 fd_set rset2, wset2, xset2;
2583 if (ml->is_running) {
2584 error (g, _("select_main_loop_run: this cannot be called recursively"));
2590 while (ml->is_running) {
2591 if (ml->nr_fds == 0)
2597 r = select (ml->max_fd+1, &rset2, &wset2, &xset2, NULL);
2599 if (errno == EINTR || errno == EAGAIN)
2601 perrorf (g, "select");
2606 for (fd = 0; r > 0 && fd <= ml->max_fd; ++fd) {
2608 if (FD_ISSET (fd, &rset2))
2609 events |= GUESTFS_HANDLE_READABLE;
2610 if (FD_ISSET (fd, &wset2))
2611 events |= GUESTFS_HANDLE_WRITABLE;
2612 if (FD_ISSET (fd, &xset2))
2613 events |= GUESTFS_HANDLE_ERROR | GUESTFS_HANDLE_HANGUP;
2616 ml->handle_cb_data[fd].cb ((guestfs_main_loop *) ml,
2617 ml->handle_cb_data[fd].g,
2618 ml->handle_cb_data[fd].data,
2629 select_main_loop_quit (guestfs_main_loop *mlv, guestfs_h *g)
2631 struct select_main_loop *ml = (struct select_main_loop *) mlv;
2633 /* Note that legitimately ml->is_running can be zero when
2634 * this function is called.