/* vi: set sw=4 ts=4: */
/*
- * Utility routines.
+ * Stub for linking busybox binary against libbusybox.
*
- * Copyright (C) tons of folks. Tracking down who wrote what
- * 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.
+ * Copyright (C) 2007 Denys Vlasenko <vda.linux@googlemail.com>
*
+ * Licensed under GPLv2, see file License in this tarball for details.
*/
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#include <assert.h>
#include "busybox.h"
-#undef APPLET
-#undef APPLET_NOUSAGE
-#undef PROTOTYPES
-#include "applets.h"
-
-struct BB_applet *applet_using;
-
-/* The -1 arises because of the {0,NULL,0,-1} entry above. */
-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 int parse_config_file (void);
-
-static int config_ok;
-
-#define CONFIG_FILE "/etc/busybox.conf"
-
-/* applets [] is const, so we have to define this "override" structure */
-struct BB_suid_config
-{
- struct BB_applet *m_applet;
-
- uid_t m_uid;
- gid_t m_gid;
- mode_t m_mode;
-
- struct BB_suid_config *m_next;
-};
-
-static struct BB_suid_config *suid_config;
-
-#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)
- config_ok = 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)
-{
- struct group *grp = getgrgid (g);
-
- if (grp) {
- char **mem;
-
- for (mem = grp->gr_mem; *mem; mem++) {
- struct passwd *pwd = getpwnam (*mem);
-
- if (pwd && (pwd->pw_uid == u))
- return 1;
- }
- }
- 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 (config_ok) {
- 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
-
-
-#define parse_error(x) { err=x; goto pe_label; }
-
-
-int
-parse_config_file (void)
+#if ENABLE_BUILD_LIBBUSYBOX
+int main(int argc UNUSED_PARAM, char **argv)
{
- struct stat st;
- char *err = 0;
- FILE *f = 0;
- int lc = 0;
-
- suid_config = 0;
-
- /* is there a config file ? */
- if (stat (CONFIG_FILE, &st) == 0) {
- /* is it owned by root with no write perm. for group and others ? */
- if (S_ISREG (st.st_mode) && (st.st_uid == 0)
- && (!(st.st_mode & (S_IWGRP | S_IWOTH)))) {
- /* that's ok .. then try to open it */
- f = fopen (CONFIG_FILE, "r");
-
- if (f) {
- char buffer[256];
- int section = 0;
-
- while (fgets (buffer, sizeof (buffer) - 1, f)) {
- char c = buffer[0];
- char *p;
-
- lc++;
-
- p = strchr (buffer, '#');
- if (p)
- *p = 0;
- p = buffer + bb_strlen (buffer);
- while ((p > buffer) && isspace (*--p))
- *p = 0;
-
- if (p == buffer)
- continue;
-
- if (c == '[') {
- p = strchr (buffer, ']');
-
- if (!p || (p == (buffer + 1))) /* no matching ] or empty [] */
- parse_error ("malformed section header");
-
- *p = 0;
-
- if (strcasecmp (buffer + 1, "SUID") == 0)
- section = 1;
- else
- section = -1; /* unknown section - just skip */
- } else if (section) {
- switch (section) {
- case 1:{ /* SUID */
- int l;
- struct BB_applet *applet;
-
- p = strchr (buffer, '='); /* <key>[::space::]*=[::space::]*<value> */
-
- if (!p || (p == (buffer + 1))) /* no = or key is empty */
- parse_error ("malformed keyword");
-
- l = p - buffer;
- while (isspace (buffer[--l])) {
- /* skip whitespace */
- }
-
- buffer[l + 1] = 0;
-
- if ((applet = find_applet_by_name (buffer))) {
- struct BB_suid_config *sct =
- xmalloc (sizeof (struct BB_suid_config));
-
- sct->m_applet = applet;
- sct->m_next = suid_config;
- suid_config = sct;
-
- while (isspace (*++p)) {
- /* skip whitespace */
- }
-
- sct->m_mode = 0;
-
- switch (*p++) {
- case 'S':
- sct->m_mode |= S_ISUID;
- break;
- case 's':
- sct->m_mode |= S_ISUID;
- /* no break */
- case 'x':
- sct->m_mode |= S_IXUSR;
- break;
- case '-':
- break;
- default:
- parse_error ("invalid user mode");
- }
-
- switch (*p++) {
- case 's':
- sct->m_mode |= S_ISGID;
- /* no break */
- case 'x':
- sct->m_mode |= S_IXGRP;
- break;
- case 'S':
- break;
- case '-':
- break;
- default:
- parse_error ("invalid group mode");
- }
-
- switch (*p) {
- case 't':
- case 'x':
- sct->m_mode |= S_IXOTH;
- break;
- case 'T':
- case '-':
- break;
- default:
- parse_error ("invalid other mode");
- }
-
- while (isspace (*++p)) {
- /* skip whitespace */
- }
-
- if (isdigit (*p)) {
- sct->m_uid = strtol (p, &p, 10);
- if (*p++ != '.')
- parse_error ("parsing <uid>.<gid>");
- } else {
- struct passwd *pwd;
- char *p2 = strchr (p, '.');
-
- if (!p2)
- parse_error ("parsing <uid>.<gid>");
-
- *p2 = 0;
- pwd = getpwnam (p);
-
- if (!pwd)
- parse_error ("invalid user name");
-
- sct->m_uid = pwd->pw_uid;
- p = p2 + 1;
- }
- if (isdigit (*p))
- sct->m_gid = strtol (p, &p, 10);
- else {
- struct group *grp = getgrnam (p);
-
- if (!grp)
- parse_error ("invalid group name");
-
- sct->m_gid = grp->gr_gid;
- }
- }
- break;
- }
- default: /* unknown - skip */
- break;
- }
- } else
- parse_error ("keyword not within section");
- }
- fclose (f);
- return 1;
- }
- }
- }
- return 0; /* no config file or not readable (not an error) */
-
-pe_label:
- fprintf (stderr, "Parse error in %s, line %d: %s\n", CONFIG_FILE, lc, err);
-
- if (f)
- fclose (f);
- return 0;
+ return lbb_main(argv);
}
-
#endif
-
-#endif
-
-/* END CODE */
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
projects / oweals / busybox.git / blobdiff