--- /dev/null
+/* virt-rescue
+ * Copyright (C) 2010 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "progname.h"
+#include "xvasprintf.h"
+
+#include "guestfs.h"
+#include "options.h"
+
+/* Currently open libguestfs handle. */
+guestfs_h *g;
+
+int read_only = 0;
+int verbose = 0;
+int keys_from_stdin = 0;
+int echo_keys = 0;
+const char *libvirt_uri = NULL;
+int inspector = 0;
+
+static inline char *
+bad_cast (char const *s)
+{
+ return (char *) s;
+}
+
+static void __attribute__((noreturn))
+usage (int status)
+{
+ if (status != EXIT_SUCCESS)
+ fprintf (stderr, _("Try `%s --help' for more information.\n"),
+ program_name);
+ else {
+ fprintf (stdout,
+ _("%s: Run a rescue shell on a virtual machine\n"
+ "Copyright (C) 2009-2010 Red Hat Inc.\n"
+ "Usage:\n"
+ " %s [--options] -d domname\n"
+ " %s [--options] -a disk.img [-a disk.img ...]\n"
+ "Options:\n"
+ " -a|--add image Add image\n"
+ " --append kernelopts Append kernel options\n"
+ " -c|--connect uri Specify libvirt URI for -d option\n"
+ " -d|--domain guest Add disks from libvirt guest\n"
+ " --format[=raw|..] Force disk format for -a option\n"
+ " --help Display brief help\n"
+ " -m|--memsize MB Set memory size in megabytes\n"
+ " --network Enable network\n"
+ " -r|--ro Access read-only\n"
+ " --selinux Enable SELinux\n"
+ " -v|--verbose Verbose messages\n"
+ " -V|--version Display version and exit\n"
+ " -x Trace libguestfs API calls\n"
+ "For more information, see the manpage %s(1).\n"),
+ program_name, program_name, program_name,
+ program_name);
+ }
+ exit (status);
+}
+
+int
+main (int argc, char *argv[])
+{
+ /* Set global program name that is not polluted with libtool artifacts. */
+ set_program_name (argv[0]);
+
+ setlocale (LC_ALL, "");
+ bindtextdomain (PACKAGE, LOCALEBASEDIR);
+ textdomain (PACKAGE);
+
+ enum { HELP_OPTION = CHAR_MAX + 1 };
+
+ static const char *options = "a:c:d:m:rvVx";
+ static const struct option long_options[] = {
+ { "add", 1, 0, 'a' },
+ { "append", 1, 0, 0 },
+ { "connect", 1, 0, 'c' },
+ { "domain", 1, 0, 'd' },
+ { "format", 2, 0, 0 },
+ { "help", 0, 0, HELP_OPTION },
+ { "memsize", 1, 0, 'm' },
+ { "network", 0, 0, 0 },
+ { "ro", 0, 0, 'r' },
+ { "selinux", 0, 0, 0 },
+ { "verbose", 0, 0, 'v' },
+ { "version", 0, 0, 'V' },
+ { 0, 0, 0, 0 }
+ };
+ struct drv *drvs = NULL;
+ struct drv *drv;
+ char *p, *file = NULL;
+ const char *format = NULL;
+ int c;
+ int option_index;
+ int network = 0;
+ const char *append = NULL;
+ char *append_full;
+ int memsize = 0;
+
+ g = guestfs_create ();
+ if (g == NULL) {
+ fprintf (stderr, _("guestfs_create: failed to create handle\n"));
+ exit (EXIT_FAILURE);
+ }
+
+ argv[0] = bad_cast (program_name);
+
+ for (;;) {
+ c = getopt_long (argc, argv, options, long_options, &option_index);
+ if (c == -1) break;
+
+ switch (c) {
+ case 0: /* options which are long only */
+ if (STREQ (long_options[option_index].name, "selinux")) {
+ guestfs_set_selinux (g, 1);
+ } else if (STREQ (long_options[option_index].name, "append")) {
+ append = optarg;
+ } else if (STREQ (long_options[option_index].name, "network")) {
+ network = 1;
+ } else if (STREQ (long_options[option_index].name, "format")) {
+ if (!optarg || STREQ (optarg, ""))
+ format = NULL;
+ else
+ format = optarg;
+ } else {
+ fprintf (stderr, _("%s: unknown long option: %s (%d)\n"),
+ program_name, long_options[option_index].name, option_index);
+ exit (EXIT_FAILURE);
+ }
+ break;
+
+ case 'a':
+ OPTION_a;
+ break;
+
+ case 'c':
+ OPTION_c;
+ break;
+
+ case 'd':
+ OPTION_d;
+ break;
+
+ case 'h':
+ usage (EXIT_SUCCESS);
+
+ case 'm':
+ if (sscanf (optarg, "%u", &memsize) != 1) {
+ fprintf (stderr, _("%s: could not parse memory size '%s'\n"),
+ program_name, optarg);
+ exit (EXIT_FAILURE);
+ }
+ break;
+
+ case 'r':
+ OPTION_r;
+ break;
+
+ case 'v':
+ OPTION_v;
+ break;
+
+ case 'V':
+ OPTION_V;
+ break;
+
+ case 'x':
+ OPTION_x;
+ break;
+
+ case HELP_OPTION:
+ usage (EXIT_SUCCESS);
+
+ default:
+ usage (EXIT_FAILURE);
+ }
+ }
+
+ /* Old-style syntax? There were no -a or -d options in the old
+ * virt-rescue which is how we detect this.
+ */
+ if (drvs == NULL) {
+ while (optind < argc) {
+ if (strchr (argv[optind], '/') ||
+ access (argv[optind], F_OK) == 0) { /* simulate -a option */
+ drv = malloc (sizeof (struct drv));
+ if (!drv) {
+ perror ("malloc");
+ exit (EXIT_FAILURE);
+ }
+ drv->type = drv_a;
+ drv->a.filename = argv[optind];
+ drv->a.format = NULL;
+ drv->next = drvs;
+ drvs = drv;
+ } else { /* simulate -d option */
+ drv = malloc (sizeof (struct drv));
+ if (!drv) {
+ perror ("malloc");
+ exit (EXIT_FAILURE);
+ }
+ drv->type = drv_d;
+ drv->d.guest = argv[optind];
+ drv->next = drvs;
+ drvs = drv;
+ }
+
+ optind++;
+ }
+ }
+
+ /* These are really constants, but they have to be variables for the
+ * options parsing code. Assert here that they have known-good
+ * values.
+ */
+ assert (inspector == 0);
+ assert (keys_from_stdin == 0);
+ assert (echo_keys == 0);
+
+ /* Must be no extra arguments on the command line. */
+ if (optind != argc)
+ usage (EXIT_FAILURE);
+
+ /* User must have specified some drives. */
+ if (drvs == NULL)
+ usage (EXIT_FAILURE);
+
+ /* Setting "direct mode" is required for the rescue appliance. */
+ guestfs_set_direct (g, 1);
+
+ /* Set other features. */
+ if (memsize > 0)
+ guestfs_set_memsize (g, memsize);
+ if (network)
+ guestfs_set_network (g, 1);
+
+ /* Kernel command line must include guestfs_rescue=1 (see
+ * appliance/init) as well as other options.
+ */
+ append_full = xasprintf ("guestfs_rescue=1%s%s",
+ append ? " " : "",
+ append ? append : "");
+ guestfs_set_append (g, append_full);
+ free (append_full);
+
+ /* Add drives. */
+ add_drives (drvs, 'a');
+
+ /* Free up data structures, no longer needed after this point. */
+ free_drives (drvs);
+
+ /* Run the appliance. This won't return until the user quits the
+ * appliance.
+ */
+ guestfs_set_error_handler (g, NULL, NULL);
+ guestfs_launch (g);
+
+ /* launch() expects guestfsd to start. However, virt-rescue doesn't
+ * run guestfsd, so this will always fail with ECHILD when the
+ * appliance exits unexpectedly.
+ */
+ if (errno != ECHILD) {
+ fprintf (stderr, "%s: %s\n", program_name, guestfs_last_error (g));
+ guestfs_close (g);
+ exit (EXIT_FAILURE);
+ }
+
+ guestfs_close (g);
+
+ exit (EXIT_SUCCESS);
+}
+
+/* The following was a nice idea, but in fact it doesn't work. This is
+ * because qemu has some (broken) pty emulation itself.
+ */
+#if 0
+ int fd_m, fd_s, r;
+ pid_t pid;
+ struct termios tsorig, tsnew;
+
+ /* Set up pty. */
+ fd_m = posix_openpt (O_RDWR);
+ if (fd_m == -1) {
+ perror ("posix_openpt");
+ exit (EXIT_FAILURE);
+ }
+ r = grantpt (fd_m);
+ if (r == -1) {
+ perror ("grantpt");
+ exit (EXIT_FAILURE);
+ }
+ r = unlockpt (fd_m);
+ if (r == -1) {
+ perror ("unlockpt");
+ exit (EXIT_FAILURE);
+ }
+ fd_s = open (ptsname (fd_m), O_RDWR);
+ if (fd_s == -1) {
+ perror ("open ptsname");
+ exit (EXIT_FAILURE);
+ }
+
+ pid = fork ();
+ if (pid == -1) {
+ perror ("fork");
+ exit (EXIT_FAILURE);
+ }
+ if (pid == 0) {
+ /* Child process. */
+
+#if 1
+ /* Set raw mode. */
+ r = tcgetattr (fd_s, &tsorig);
+ tsnew = tsorig;
+ cfmakeraw (&tsnew);
+ tcsetattr (fd_s, TCSANOW, &tsnew);
+#endif
+
+ /* Close the master side of pty and set slave side as
+ * stdin/stdout/stderr.
+ */
+ close (fd_m);
+
+ close (0);
+ close (1);
+ close (2);
+ if (dup (fd_s) == -1 || dup (fd_s) == -1 || dup (fd_s) == -1) {
+ perror ("dup");
+ exit (EXIT_FAILURE);
+ }
+ close (fd_s);
+
+#if 1
+ if (setsid () == -1)
+ perror ("warning: failed to setsid");
+ if (ioctl (0, TIOCSCTTY, 0) == -1)
+ perror ("warning: failed to TIOCSCTTY");
+#endif
+
+ /* Run the appliance. This won't return until the user quits the
+ * appliance.
+ */
+ guestfs_set_error_handler (g, NULL, NULL);
+ r = guestfs_launch (g);
+
+ /* launch() expects guestfsd to start. However, virt-rescue doesn't
+ * run guestfsd, so this will always fail with ECHILD when the
+ * appliance exits unexpectedly.
+ */
+ if (errno != ECHILD) {
+ fprintf (stderr, "%s: %s\n", program_name, guestfs_last_error (g));
+ guestfs_close (g);
+ exit (EXIT_FAILURE);
+ }
+
+ guestfs_close (g);
+ _exit (EXIT_SUCCESS);
+ }
+
+ /* Parent process continues ... */
+
+ /* Close slave side of pty. */
+ close (fd_s);
+
+ /* Set raw mode. */
+ r = tcgetattr (fd_s, &tsorig);
+ tsnew = tsorig;
+ cfmakeraw (&tsnew);
+ tcsetattr (fd_s, TCSANOW, &tsnew);
+
+ /* Send input and output to master side of pty. */
+ r = multiplex (fd_m);
+ tcsetattr (fd_s, TCSANOW, &tsorig); /* Restore cooked mode. */
+ if (r == -1)
+ exit (EXIT_FAILURE);
+
+ if (waitpid (pid, &r, 0) == -1) {
+ perror ("waitpid");
+ exit (EXIT_FAILURE);
+ }
+ if (!WIFEXITED (r)) {
+ /* abnormal child exit */
+ fprintf (stderr, _("%s: unknown child exit status (%d)\n"),
+ program_name, r);
+ exit (EXIT_FAILURE);
+ }
+ else
+ exit (WEXITSTATUS (r)); /* normal exit, return child process's status */
+}
+
+/* Naive and simple multiplex function. */
+static int
+multiplex (int fd_m)
+{
+ int r, eof_stdin = 0;
+ fd_set rfds, wfds;
+ char tobuf[BUFSIZ], frombuf[BUFSIZ]; /* to/from slave */
+ size_t tosize = 0, fromsize = 0;
+ ssize_t n;
+ size_t count;
+ long flags_0, flags_1, flags_fd_m;
+
+ flags_0 = fcntl (0, F_GETFL);
+ fcntl (0, F_SETFL, O_NONBLOCK | flags_0);
+ flags_1 = fcntl (0, F_GETFL);
+ fcntl (1, F_SETFL, O_NONBLOCK | flags_1);
+ flags_fd_m = fcntl (0, F_GETFL);
+ fcntl (fd_m, F_SETFL, O_NONBLOCK | flags_fd_m);
+
+ for (;;) {
+ FD_ZERO (&rfds);
+ FD_ZERO (&wfds);
+
+ /* Still space in to-buffer? If so, we can read from the user. */
+ if (!eof_stdin && tosize < BUFSIZ)
+ FD_SET (0, &rfds);
+ /* Still space in from-buffer? If so, we can read from the slave. */
+ if (fromsize < BUFSIZ)
+ FD_SET (fd_m, &rfds);
+ /* Content in to-buffer? If so, we want to write to the slave. */
+ if (tosize > 0)
+ FD_SET (fd_m, &wfds);
+ /* Content in from-buffer? If so, we want to write to the user. */
+ if (fromsize > 0)
+ FD_SET (1, &wfds);
+
+ r = select (fd_m+1, &rfds, &wfds, NULL, NULL);
+ if (r == -1) {
+ if (errno == EAGAIN || errno == EINTR)
+ continue;
+ perror ("select");
+ return -1;
+ }
+
+ /* Input from user: Put it in the to-buffer. */
+ if (FD_ISSET (0, &rfds)) {
+ count = BUFSIZ - tosize;
+ n = read (0, &tobuf[tosize], count);
+ if (n == -1) {
+ perror ("read");
+ return -1;
+ }
+ if (n == 0) { /* stdin was closed */
+ eof_stdin = 1;
+ /* This is what telnetd does ... */
+ tobuf[tosize] = '\004';
+ tosize += 1;
+ } else
+ tosize += n;
+ }
+
+ /* Input from slave: Put it in the from-buffer. */
+ if (FD_ISSET (fd_m, &rfds)) {
+ count = BUFSIZ - fromsize;
+ n = read (fd_m, &frombuf[fromsize], count);
+ if (n == -1) {
+ if (errno != EIO) /* EIO if slave process dies */
+ perror ("read");
+ break;
+ }
+ if (n == 0) /* slave closed the connection */
+ break;
+ fromsize += n;
+ }
+
+ /* Can write to user. */
+ if (FD_ISSET (1, &wfds)) {
+ n = write (1, frombuf, fromsize);
+ if (n == -1) {
+ perror ("write");
+ return -1;
+ }
+ memmove (frombuf, &frombuf[n], BUFSIZ - n);
+ fromsize -= n;
+ }
+
+ /* Can write to slave. */
+ if (FD_ISSET (fd_m, &wfds)) {
+ n = write (fd_m, tobuf, tosize);
+ if (n == -1) {
+ perror ("write");
+ return -1;
+ }
+ memmove (tobuf, &tobuf[n], BUFSIZ - n);
+ tosize -= n;
+ }
+ } /* for (;;) */
+
+ /* We end up here when slave has closed the connection. */
+ close (fd_m);
+
+ /* Restore blocking behaviour. */
+ fcntl (1, F_SETFL, flags_1);
+
+ /* Last chance to write out any remaining data in the buffers, but
+ * don't bother about errors.
+ */
+ ignore_value (write (1, frombuf, fromsize));
+
+ return 0;
+}
+#endif
git.annexia.org / libguestfs.git / blobdiff