* isn't something I'm going to worry about... If you wrote something
* here, please feel free to acknowledge your work.
*
- * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
* Permission has been granted to redistribute this code under the GPL.
*
+ * Licensed under GPLv2 or later, see file License in this tarball for details.
*/
+#include "busybox.h"
#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
#include <string.h>
#include <assert.h>
-#include "busybox.h"
+
+#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
+static const char usage_messages[] =
+#define MAKE_USAGE
+#include "usage.h"
+#include "applets.h"
+;
+#undef MAKE_USAGE
+#else
+#define usage_messages 0
+#endif /* ENABLE_SHOW_USAGE */
#undef APPLET
#undef APPLET_NOUSAGE
const size_t NUM_APPLETS = (sizeof (applets) / sizeof (struct BB_applet) - 1);
-#ifdef CONFIG_FEATURE_SUID
-
-static void check_suid (struct BB_applet *app);
-
#ifdef CONFIG_FEATURE_SUID_CONFIG
-#include <sys/stat.h>
#include <ctype.h>
#include "pwd_.h"
#include "grp_.h"
-static void parse_config_file (void);
-
#define CONFIG_FILE "/etc/busybox.conf"
/* applets [] is const, so we have to define this "override" structure */
-struct BB_suid_config
+static struct BB_suid_config
{
struct BB_applet *m_applet;
mode_t m_mode;
struct BB_suid_config *m_next;
-};
+} *suid_config;
-static struct BB_suid_config *suid_config;
static int suid_cfg_readable;
-#endif /* CONFIG_FEATURE_SUID_CONFIG */
-
-#endif /* CONFIG_FEATURE_SUID */
-
-
-
-extern void
-bb_show_usage (void)
-{
- const char *format_string;
- const char *usage_string = usage_messages;
- int i;
-
- for (i = applet_using - applets; i > 0;) {
- if (!*usage_string++) {
- --i;
- }
- }
-
- format_string = "%s\n\nUsage: %s %s\n\n";
- if (*usage_string == '\b')
- format_string = "%s\n\nNo help available.\n\n";
- fprintf (stderr, format_string, bb_msg_full_version, applet_using->name,
- usage_string);
-
- exit (EXIT_FAILURE);
-}
-
-static int
-applet_name_compare (const void *x, const void *y)
-{
- const char *name = x;
- const struct BB_applet *applet = y;
-
- return strcmp (name, applet->name);
-}
-
-extern const size_t NUM_APPLETS;
-
-struct BB_applet *
-find_applet_by_name (const char *name)
-{
- return bsearch (name, applets, NUM_APPLETS, sizeof (struct BB_applet),
- applet_name_compare);
-}
-
-void
-run_applet_by_name (const char *name, int argc, char **argv)
-{
- static int recurse_level = 0;
- extern int been_there_done_that; /* From busybox.c */
-
-#ifdef CONFIG_FEATURE_SUID_CONFIG
- if (recurse_level == 0)
- parse_config_file ();
-#endif
-
- recurse_level++;
- /* Do a binary search to find the applet entry given the name. */
- if ((applet_using = find_applet_by_name (name)) != NULL) {
- bb_applet_name = applet_using->name;
- if (argv[1] && strcmp (argv[1], "--help") == 0) {
- if (strcmp (applet_using->name, "busybox") == 0) {
- if (argv[2])
- applet_using = find_applet_by_name (argv[2]);
- else
- applet_using = NULL;
- }
- if (applet_using)
- bb_show_usage ();
- been_there_done_that = 1;
- busybox_main (0, NULL);
- }
-#ifdef CONFIG_FEATURE_SUID
- check_suid (applet_using);
-#endif
-
- exit ((*(applet_using->main)) (argc, argv));
- }
- /* Just in case they have renamed busybox - Check argv[1] */
- if (recurse_level == 1) {
- run_applet_by_name ("busybox", argc, argv);
- }
- recurse_level--;
-}
-
-
-#ifdef CONFIG_FEATURE_SUID
-
-#ifdef CONFIG_FEATURE_SUID_CONFIG
-
/* check if u is member of group g */
-static int
-ingroup (uid_t u, gid_t g)
+static int ingroup (uid_t u, gid_t g)
{
struct group *grp = getgrgid (g);
return 0;
}
-#endif
-
-
-void
-check_suid (struct BB_applet *applet)
-{
- uid_t ruid = getuid (); /* real [ug]id */
- uid_t rgid = getgid ();
-
-#ifdef CONFIG_FEATURE_SUID_CONFIG
- if (suid_cfg_readable) {
- struct BB_suid_config *sct;
-
- for (sct = suid_config; sct; sct = sct->m_next) {
- if (sct->m_applet == applet)
- break;
- }
- if (sct) {
- mode_t m = sct->m_mode;
-
- if (sct->m_uid == ruid) /* same uid */
- m >>= 6;
- else if ((sct->m_gid == rgid) || ingroup (ruid, sct->m_gid)) /* same group / in group */
- m >>= 3;
-
- if (!(m & S_IXOTH)) /* is x bit not set ? */
- bb_error_msg_and_die ("You have no permission to run this applet!");
-
- if ((sct->m_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { /* *both* have to be set for sgid */
- if (setegid (sct->m_gid))
- bb_error_msg_and_die
- ("BusyBox binary has insufficient rights to set proper GID for applet!");
- } else
- setgid (rgid); /* no sgid -> drop */
-
- if (sct->m_mode & S_ISUID) {
- if (seteuid (sct->m_uid))
- bb_error_msg_and_die
- ("BusyBox binary has insufficient rights to set proper UID for applet!");
- } else
- setuid (ruid); /* no suid -> drop */
- } else {
- /* default: drop all priviledges */
- setgid (rgid);
- setuid (ruid);
- }
- return;
- } else {
-#ifndef CONFIG_FEATURE_SUID_CONFIG_QUIET
- static int onetime = 0;
-
- if (!onetime) {
- onetime = 1;
- fprintf (stderr, "Using fallback suid method\n");
- }
-#endif
- }
-#endif
-
- if (applet->need_suid == _BB_SUID_ALWAYS) {
- if (geteuid () != 0)
- bb_error_msg_and_die ("This applet requires root priviledges!");
- } else if (applet->need_suid == _BB_SUID_NEVER) {
- setgid (rgid); /* drop all priviledges */
- setuid (ruid);
- }
-}
-
-#ifdef CONFIG_FEATURE_SUID_CONFIG
-
/* This should probably be a libbb routine. In that case,
* I'd probably rename it to something like bb_trimmed_slice.
*/
/* Next, advance past all leading space and return a ptr to the
* first non-space char; possibly the terminating nul. */
- return (char *) bb_skip_whitespace(s);
+ return skip_whitespace(s);
}
/* Get the specified mode. */
- e = (char *) bb_skip_whitespace(e+1);
+ e = skip_whitespace(e+1);
for (i=0 ; i < 3 ; i++) {
const char *q;
}
/* Now get the the user/group info. */
-
- s = (char *) bb_skip_whitespace(e);
+
+ s = skip_whitespace(e);
/* Note: We require whitespace between the mode and the
* user/group info. */
/* Encountering configuration lines prior to seeing a
* section header is treated as an error. This is how
- * the old code worked, but it may not be desireable.
+ * the old code worked, but it may not be desirable.
* We may want to simply ignore such lines in case they
* are used in some future version of busybox. */
if (!section) {
return;
}
-#endif
+#else
+#define parse_config_file()
+#endif /* CONFIG_FEATURE_SUID_CONFIG */
+
+#ifdef CONFIG_FEATURE_SUID
+static void check_suid (struct BB_applet *applet)
+{
+ uid_t ruid = getuid (); /* real [ug]id */
+ uid_t rgid = getgid ();
+
+#ifdef CONFIG_FEATURE_SUID_CONFIG
+ if (suid_cfg_readable) {
+ struct BB_suid_config *sct;
+
+ for (sct = suid_config; sct; sct = sct->m_next) {
+ if (sct->m_applet == applet)
+ break;
+ }
+ if (sct) {
+ mode_t m = sct->m_mode;
+
+ if (sct->m_uid == ruid) /* same uid */
+ m >>= 6;
+ else if ((sct->m_gid == rgid) || ingroup (ruid, sct->m_gid)) /* same group / in group */
+ m >>= 3;
+
+ if (!(m & S_IXOTH)) /* is x bit not set ? */
+ bb_error_msg_and_die ("You have no permission to run this applet!");
+
+ if ((sct->m_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { /* *both* have to be set for sgid */
+ xsetgid(sct->m_gid);
+ } else xsetgid(rgid); /* no sgid -> drop */
+
+ if (sct->m_mode & S_ISUID) xsetuid(sct->m_uid);
+ else xsetuid(ruid); /* no suid -> drop */
+ } else {
+ /* default: drop all privileges */
+ xsetgid(rgid);
+ xsetuid(ruid);
+ }
+ return;
+ } else {
+#ifndef CONFIG_FEATURE_SUID_CONFIG_QUIET
+ static int onetime = 0;
+ if (!onetime) {
+ onetime = 1;
+ fprintf (stderr, "Using fallback suid method\n");
+ }
+#endif
+ }
#endif
-/* END CODE */
-/*
- Local Variables:
- c-file-style: "linux"
- c-basic-offset: 4
- tab-width: 4
-End:
-*/
+ if (applet->need_suid == _BB_SUID_ALWAYS) {
+ if (geteuid()) bb_error_msg_and_die("Applet requires root privileges!");
+ } else if (applet->need_suid == _BB_SUID_NEVER) {
+ xsetgid(rgid); /* drop all privileges */
+ xsetuid(ruid);
+ }
+}
+#else
+#define check_suid(x)
+#endif /* CONFIG_FEATURE_SUID */
+
+
+
+#if ENABLE_FEATURE_COMPRESS_USAGE
+
+#include "usage_compressed.h"
+#include "unarchive.h"
+
+static const char *unpack_usage_messages(void)
+{
+ int input[2], output[2], pid;
+ char *buf;
+
+ if(pipe(input) < 0 || pipe(output) < 0)
+ exit(1);
+
+ pid = fork();
+ switch (pid) {
+ case -1: /* error */
+ exit(1);
+ case 0: /* child */
+ close(input[1]);
+ close(output[0]);
+ uncompressStream(input[0], output[1]);
+ exit(0);
+ }
+ /* parent */
+
+ close(input[0]);
+ close(output[1]);
+ pid = fork();
+ switch (pid) {
+ case -1: /* error */
+ exit(1);
+ case 0: /* child */
+ full_write(input[1], packed_usage, sizeof(packed_usage));
+ exit(0);
+ }
+ /* parent */
+ close(input[1]);
+
+ buf = xmalloc(SIZEOF_usage_messages);
+ full_read(output[0], buf, SIZEOF_usage_messages);
+ return buf;
+}
+
+#else
+#define unpack_usage_messages() usage_messages
+#endif /* ENABLE_FEATURE_COMPRESS_USAGE */
+
+void bb_show_usage (void)
+{
+ if (ENABLE_SHOW_USAGE) {
+ const char *format_string;
+ const char *usage_string = unpack_usage_messages();
+ int i;
+
+ for (i = applet_using - applets; i > 0;)
+ if (!*usage_string++) --i;
+
+ format_string = "%s\n\nUsage: %s %s\n\n";
+ if (*usage_string == '\b')
+ format_string = "%s\n\nNo help available.\n\n";
+ fprintf (stderr, format_string, bb_msg_full_version,
+ applet_using->name, usage_string);
+ }
+
+ exit (bb_default_error_retval);
+}
+
+static int applet_name_compare(const void *name, const void *vapplet)
+{
+ const struct BB_applet *applet = vapplet;
+
+ return strcmp(name, applet->name);
+}
+
+extern const size_t NUM_APPLETS;
+
+struct BB_applet *find_applet_by_name(const char *name)
+{
+ return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet),
+ applet_name_compare);
+}
+
+void run_applet_by_name(const char *name, int argc, char **argv)
+{
+ if (ENABLE_FEATURE_SUID_CONFIG) parse_config_file();
+
+ if (!strncmp(name, "busybox", 7)) busybox_main(argc, argv);
+ /* Do a binary search to find the applet entry given the name. */
+ applet_using = find_applet_by_name(name);
+ if (applet_using) {
+ bb_applet_name = applet_using->name;
+ if(argc==2 && !strcmp(argv[1], "--help")) bb_show_usage();
+ if(ENABLE_FEATURE_SUID) check_suid(applet_using);
+ exit((*(applet_using->main))(argc, argv));
+ }
+}