107 lines
2.1 KiB
C
107 lines
2.1 KiB
C
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/*
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* Copyright (C) 2008 Natanael Copa <natanael.copa@gmail.com>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation. See http://www.gnu.org/ for details.
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*
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*/
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <libgen.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define BBSUID_PATH "/bin/bbsuid"
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const static char * applets[] = {
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"/bin/mount",
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"/bin/umount",
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"/usr/bin/crontab",
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"/usr/bin/passwd",
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"/usr/bin/su",
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"/usr/bin/traceroute",
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"/usr/bin/traceroute6",
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"/usr/bin/vlock",
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NULL
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};
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static const char *applet_from_path(const char *str)
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{
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const char *p = strrchr(str, '/');
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if (p == NULL)
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p = str;
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else
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p++;
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return p;
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}
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static int is_valid_applet(const char *str)
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{
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int i;
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for (i = 0; applets[i] != NULL; i++) {
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const char *a = applet_from_path(applets[i]);
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if (strcmp(applet_from_path(str), a) == 0)
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return 1;
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}
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return 0;
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}
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int exec_busybox(const char *app, int argc, char **argv)
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{
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char **newargv = malloc((argc + 2) * sizeof(char *));
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int i;
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newargv[0] = "/bin/busybox";
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newargv[1] = (char *)app;
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for (i = 1; i < argc; i++)
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newargv[i+1] = argv[i];
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newargv[argc+1] = NULL;
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execv(newargv[0], newargv);
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perror(newargv[0]);
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free(newargv);
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return 1;
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}
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static int install_links(void)
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{
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int i, r = 0;
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/* we don't want others than root to install the symlinks */
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if (getuid() != 0)
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errx(1, "Only root can install symlinks");
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for (i = 0; applets[i] != NULL; i++) {
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const char *a = applets[i];
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struct stat st;
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if (lstat(a, &st) == 0 && S_ISLNK(st.st_mode))
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unlink(a);
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if (symlink(BBSUID_PATH, a) < 0)
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r++;
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}
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return r;
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}
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int main(int argc, char **argv)
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{
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const char *app = applet_from_path(argv[0]);
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if (strcmp(app, "bbsuid") == 0) {
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if (argc == 2 && strcmp(argv[1], "--install") == 0)
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return install_links();
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errx(1, "Use --install to install symlinks");
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}
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if (is_valid_applet(app))
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return exec_busybox(app, argc, argv);
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errx(1, "%s is not a valid applet", app);
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return 1;
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}
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