295 lines
7.4 KiB
C
295 lines
7.4 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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*
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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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* use bb's isdirectory() ? It seems that no applet use it.
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* done - use bb's concat_path_file()
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* declare run_parts_main() as extern and any other function as static? */
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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/* #include <sys/types.h> */
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#include <sys/wait.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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/* #include <signal.h>
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#include <sys/time.h> */
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#include "busybox.h"
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int test_mode = 0;
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int verbose_mode = 0;
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int exitstatus = 0;
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int argcount = 0, argsize = 0;
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char **args = 0;
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/* set_umask */
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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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void set_umask (void)
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{
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int mask, result;
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/*TODO
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* We must substitute sscanf, according to bb's style guide? */
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result = sscanf (optarg, "%o", &mask);
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if ((result != 1) || (mask > 07777) || (mask < 0)) {
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perror_msg_and_die ("bad umask value");
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}
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umask (mask);
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}
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/* add_argument */
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/* Add an argument to the commands that we will call. Called once for
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every argument. */
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void add_argument (char *newarg)
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{
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if (argcount+1 >= argsize) {
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argsize = argsize ? argsize*2 : 4;
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/*TODO if we convert to xrealloc we lose the verbose error message */
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args = realloc(args, argsize * (sizeof(char*)));
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if (!args) {
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perror_msg_and_die ("failed to reallocate memory for arguments: %s", strerror(errno));
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}
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}
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args[argcount++] = newarg;
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args[argcount] = 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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int valid_name (const struct dirent *d)
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{
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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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/* run_part */
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/* Execute a file */
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void run_part (char *progname)
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{
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int result;
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int pid;
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if ((pid=fork()) < 0) {
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perror_msg_and_die ("failed to fork: %s", strerror(errno));
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}
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else if (!pid) {
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args[0] = progname;
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execv (progname, args);
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perror_msg_and_die ("failed to exec %s: %s", progname, strerror (errno));
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}
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if (0) {
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} else {
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waitpid(pid, &result, 0);
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}
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if (WIFEXITED (result) && WEXITSTATUS(result)) {
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perror_msg ("%s exited with return code %d", progname, WEXITSTATUS(result));
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exitstatus = 1;
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}
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else if (WIFSIGNALED (result)) {
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perror_msg ("%s exited because of uncaught signal %d", progname,
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WTERMSIG(result));
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exitstatus = 1;
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}
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}
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/* run_parts */
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/* Find the parts to run & call run_part() */
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void run_parts (char *dir_name)
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{
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struct dirent **namelist;
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char *filename = NULL;
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size_t filename_length, dir_name_length;
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int entries, i, result;
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struct stat st;
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/* dir_name + "/" */
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dir_name_length = strlen(dir_name) + 1;
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/* dir_name + "/" + ".." + "\0" (This will save one realloc.) */
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filename_length = dir_name_length + 2 + 1;
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/* --
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* Removed this part because I want try to use concat_path_file() */
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/* if (! (filename = malloc(filename_length))) {
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error ("failed to allocate memory for path: %s", strerror(errno));
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exit (1);
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} */
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/* -- */
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/* scandir() isn't POSIX, but it makes things easy. */
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entries = scandir (dir_name, &namelist, valid_name, alphasort);
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if (entries < 0) {
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perror_msg_and_die ("failed to open directory %s: %s", dir_name, strerror (errno));
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}
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for (i = 0; i < entries; i++) {
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/* --
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* Removed this part because I want try to use concat_path_file() */
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/* if (filename_length < dir_name_length + strlen(namelist[i]->d_name) + 1) {
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filename_length = dir_name_length + strlen(namelist[i]->d_name) + 1;
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if (!(filename = realloc(filename, filename_length))) {
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error ("failed to reallocate memory for path: %s", strerror(errno));
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exit (1);
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}
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}
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*/
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/* -- */
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/* --
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* Removed for concat_path_file() */
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/* strcpy (filename, dir_name);
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strcat (filename, "/");
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strcat (filename, namelist[i]->d_name); */
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/* -- */
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filename = concat_path_file (dir_name, namelist[i]->d_name);
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result = stat (filename, &st);
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if (result < 0) {
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perror_msg_and_die ("failed to stat component %s: %s", filename,
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strerror (errno));
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}
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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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printf ("run-parts would run %s\n", filename);
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else {
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run_part (filename);
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}
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}
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/*TODO convert to isdirectory() */
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else if (!S_ISDIR(st.st_mode)) {
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printf ("run-parts: component %s is not an executable plain file\n",
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filename);
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exitstatus = 1;
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}
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free (namelist[i]);
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}
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free (namelist);
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free (filename);
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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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{
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umask (022);
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add_argument(0);
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for (;;) {
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int c;
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opterr = 0;
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c = getopt(argc, argv, "tu:a:");
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if (c == EOF)
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break;
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switch (c) {
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case 't': /* Enable test mode */
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test_mode = 1;
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break;
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case 'u': /* Set the umask of the programs executed */
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set_umask ();
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break;
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case 'a': /* Pass an argument to the programs */
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add_argument (optarg);
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break;
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default:
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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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show_usage();
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}
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run_parts (argv[optind]);
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return exitstatus;
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}
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