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193 lines
5.0 KiB
C
193 lines
5.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini run-parts implementation for busybox
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*
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*
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* Copyright (C) 2001 by Emanuele Aina <emanuele.aina@tiscali.it>
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*
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* Based on the Debian run-parts program, version 1.15
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* Copyright (C) 1996 Jeff Noxon <jeff@router.patch.net>,
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* Copyright (C) 1996-1999 Guy Maor <maor@debian.org>
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*
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*
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* Licensed under GPL v2 or later, see file LICENSE in this tarball for details.
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*/
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/* This is my first attempt to write a program in C (well, this is my first
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* attempt to write a program! :-) . */
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/* This piece of code is heavily based on the original version of run-parts,
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* taken from debian-utils. I've only removed the long options and a the
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* report mode. As the original run-parts support only long options, I've
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* broken compatibility because the BusyBox policy doesn't allow them.
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* The supported options are:
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* -t test. Print the name of the files to be executed, without
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* execute them.
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* -a ARG argument. Pass ARG as an argument the program executed. It can
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* be repeated to pass multiple arguments.
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* -u MASK umask. Set the umask of the program executed to MASK. */
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/* TODO
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* done - convert calls to error in perror... and remove error()
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* done - convert malloc/realloc to their x... counterparts
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* done - remove catch_sigchld
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* done - use bb's concat_path_file()
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* done - declare run_parts_main() as extern and any other function as static?
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*/
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#include "busybox.h"
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#include <getopt.h>
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static const struct option runparts_long_options[] = {
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{ "test", 0, NULL, 't' },
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{ "umask", 1, NULL, 'u' },
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{ "arg", 1, NULL, 'a' },
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{ 0, 0, 0, 0 }
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};
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/* valid_name */
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/* True or false? Is this a valid filename (upper/lower alpha, digits,
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* underscores, and hyphens only?)
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*/
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static int valid_name(const struct dirent *d)
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{
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const char *c = d->d_name;
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while (*c) {
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if (!isalnum(*c) && (*c != '_') && (*c != '-')) {
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return 0;
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}
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++c;
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}
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return 1;
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}
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/* test mode = 1 is the same as official run_parts
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* test_mode = 2 means to fail silently on missing directories
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*/
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static int run_parts(char **args, const unsigned char test_mode)
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{
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struct dirent **namelist = 0;
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struct stat st;
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char *filename;
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char *arg0 = args[0];
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int entries;
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int i;
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int exitstatus = 0;
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#if __GNUC__
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/* Avoid longjmp clobbering */
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(void) &i;
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(void) &exitstatus;
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#endif
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/* scandir() isn't POSIX, but it makes things easy. */
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entries = scandir(arg0, &namelist, valid_name, alphasort);
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if (entries == -1) {
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if (test_mode & 2) {
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return 2;
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}
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bb_perror_msg_and_die("cannot open '%s'", arg0);
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}
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for (i = 0; i < entries; i++) {
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filename = concat_path_file(arg0, namelist[i]->d_name);
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xstat(filename, &st);
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if (S_ISREG(st.st_mode) && !access(filename, X_OK)) {
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if (test_mode) {
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puts(filename);
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} else {
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/* exec_errno is common vfork variable */
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volatile int exec_errno = 0;
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int result;
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int pid;
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if ((pid = vfork()) < 0) {
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bb_perror_msg_and_die("failed to fork");
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} else if (!pid) {
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args[0] = filename;
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execve(filename, args, environ);
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exec_errno = errno;
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_exit(1);
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}
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waitpid(pid, &result, 0);
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if (exec_errno) {
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errno = exec_errno;
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bb_perror_msg("failed to exec %s", filename);
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exitstatus = 1;
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}
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if (WIFEXITED(result) && WEXITSTATUS(result)) {
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bb_perror_msg("%s exited with return code %d", filename, WEXITSTATUS(result));
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exitstatus = 1;
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} else if (WIFSIGNALED(result)) {
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bb_perror_msg("%s exited because of uncaught signal %d", filename, WTERMSIG(result));
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exitstatus = 1;
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}
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}
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} else if (!S_ISDIR(st.st_mode)) {
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bb_error_msg("component %s is not an executable plain file", filename);
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exitstatus = 1;
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}
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free(namelist[i]);
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free(filename);
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}
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free(namelist);
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return exitstatus;
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}
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/* run_parts_main */
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/* Process options */
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int run_parts_main(int argc, char **argv);
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int run_parts_main(int argc, char **argv)
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{
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char **args = xmalloc(2 * sizeof(char *));
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unsigned char test_mode = 0;
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unsigned short argcount = 1;
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int opt;
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umask(022);
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while ((opt = getopt_long(argc, argv, "tu:a:",
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runparts_long_options, NULL)) > 0)
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{
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switch (opt) {
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/* Enable test mode */
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case 't':
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test_mode++;
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break;
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/* Set the umask of the programs executed */
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case 'u':
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/* Check and set the umask of the program executed. As stated in the original
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* run-parts, the octal conversion in libc is not foolproof; it will take the
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* 8 and 9 digits under some circumstances. We'll just have to live with it.
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*/
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umask(xstrtoul_range(optarg, 8, 0, 07777));
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break;
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/* Pass an argument to the programs */
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case 'a':
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/* Add an argument to the commands that we will call.
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* Called once for every argument. */
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args = xrealloc(args, (argcount + 2) * (sizeof(char *)));
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args[argcount++] = optarg;
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break;
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default:
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bb_show_usage();
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}
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}
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/* We require exactly one argument: the directory name */
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if (optind != (argc - 1)) {
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bb_show_usage();
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}
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args[0] = argv[optind];
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args[argcount] = 0;
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return run_parts(args, test_mode);
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}
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