1 /* libguestfs - the guestfsd daemon
2 * Copyright (C) 2009 Red Hat Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program 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
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <sys/types.h>
29 #include "../src/guestfs_protocol.h"
33 /* This command exposes debugging information, internals and
34 * status. There is no comprehensive documentation for this
35 * command. You have to look at the source code in this file
36 * to find out what you can do.
38 * Commands always output a freeform string.
41 #if ENABLE_DEBUG_COMMAND
44 char * (*f) (const char *subcmd, int argc, char *const *const argv);
47 static char *debug_help (const char *subcmd, int argc, char *const *const argv);
48 static char *debug_env (const char *subcmd, int argc, char *const *const argv);
49 static char *debug_fds (const char *subcmd, int argc, char *const *const argv);
50 static char *debug_segv (const char *subcmd, int argc, char *const *const argv);
51 static char *debug_sh (const char *subcmd, int argc, char *const *const argv);
53 static struct cmd cmds[] = {
54 { "help", debug_help },
57 { "segv", debug_segv },
64 do_debug (char *subcmd, char **argv)
66 #if ENABLE_DEBUG_COMMAND
69 for (i = argc = 0; argv[i] != NULL; ++i)
72 for (i = 0; cmds[i].cmd != NULL; ++i) {
73 if (strcasecmp (subcmd, cmds[i].cmd) == 0)
74 return cmds[i].f (subcmd, argc, argv);
77 reply_with_error ("use 'debug help' to list the supported commands");
80 reply_with_error ("guestfsd was not configured with --enable-debug-command");
85 #if ENABLE_DEBUG_COMMAND
87 debug_help (const char *subcmd, int argc, char *const *const argv)
92 r = strdup ("Commands supported:");
94 reply_with_perror ("strdup");
99 for (i = 0; cmds[i].cmd != NULL; ++i) {
100 len += strlen (cmds[i].cmd) + 1; /* space + new command */
101 p = realloc (r, len + 1); /* +1 for the final NUL */
103 reply_with_perror ("realloc");
110 strcat (r, cmds[i].cmd);
118 debug_fds (const char *subcmd, int argc, char *const *const argv)
126 char fname[256], link[256];
129 fp = open_memstream (&out, &size);
131 reply_with_perror ("open_memstream");
135 dir = opendir ("/proc/self/fd");
137 reply_with_perror ("opendir: /proc/self/fd");
142 while ((d = readdir (dir)) != NULL) {
143 if (strcmp (d->d_name, ".") == 0 || strcmp (d->d_name, "..") == 0)
146 snprintf (fname, sizeof fname, "/proc/self/fd/%s", d->d_name);
148 r = lstat (fname, &statbuf);
150 reply_with_perror ("stat: %s", fname);
157 if (S_ISLNK (statbuf.st_mode)) {
158 r = readlink (fname, link, sizeof link - 1);
160 reply_with_perror ("readline: %s", fname);
168 fprintf (fp, "%2s %s\n", d->d_name, link);
170 fprintf (fp, "%2s 0%o\n", d->d_name, statbuf.st_mode);
175 if (closedir (dir) == -1) {
176 reply_with_perror ("closedir");
184 /* Force a segfault in the daemon. */
186 debug_segv (const char *subcmd, int argc, char *const *const argv)
192 /* Run an arbitrary shell command using /bin/sh from the appliance.
194 * Note this is somewhat different from the ordinary guestfs_sh command
195 * because it's not using the guest shell, and is not chrooted.
197 * Also we ignore any errors and you can see the full output if you
198 * add 2>&1 to the end of the command string.
201 debug_sh (const char *subcmd, int argc, char *const *const argv)
208 reply_with_error ("debug: sh: expecting a command to run");
212 /* guestfish splits the parameter(s) into a list of strings,
213 * and we have to reassemble them here. Not ideal. XXX
215 for (i = len = 0; i < argc; ++i)
216 len += strlen (argv[i]) + 1;
219 reply_with_perror ("malloc");
222 for (i = j = 0; i < argc; ++i) {
223 len = strlen (argv[i]);
224 memcpy (&cmd[j], argv[i], len);
231 command (&out, NULL, "/bin/sh", "-c", cmd, NULL);
236 /* Print the environment that commands get (by running external printenv). */
238 debug_env (const char *subcmd, int argc, char *const *const argv)
243 r = command (&out, &err, "printenv", NULL);
245 reply_with_error ("printenv: %s", err);
256 #endif /* ENABLE_DEBUG_COMMAND */