summaryrefslogtreecommitdiff
path: root/i/pc104/initrd/conf/busybox/debianutils/run_parts.c
blob: a864a0505e9dea63b3f391795a7b8632c79b49b8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
/* vi: set sw=4 ts=4: */
/*
 * Mini run-parts implementation for busybox
 *
 *
 * Copyright (C) 2001 by Emanuele Aina <emanuele.aina@tiscali.it>
 *
 * Based on the Debian run-parts program, version 1.15
 *   Copyright (C) 1996 Jeff Noxon <jeff@router.patch.net>,
 *   Copyright (C) 1996-1999 Guy Maor <maor@debian.org>
 *
 *
 * Licensed under GPL v2 or later, see file LICENSE in this tarball for details.
 */

/* This is my first attempt to write a program in C (well, this is my first
 * attempt to write a program! :-) . */

/* This piece of code is heavily based on the original version of run-parts,
 * taken from debian-utils. I've only removed the long options and a the
 * report mode. As the original run-parts support only long options, I've
 * broken compatibility because the BusyBox policy doesn't allow them.
 * The supported options are:
 * -t			test. Print the name of the files to be executed, without
 *				execute them.
 * -a ARG		argument. Pass ARG as an argument the program executed. It can
 *				be repeated to pass multiple arguments.
 * -u MASK		umask. Set the umask of the program executed to MASK. */

/* TODO
 * done - convert calls to error in perror... and remove error()
 * done - convert malloc/realloc to their x... counterparts
 * done - remove catch_sigchld
 * done - use bb's concat_path_file()
 * done - declare run_parts_main() as extern and any other function as static?
 */

#include "busybox.h"
#include <getopt.h>

static const struct option runparts_long_options[] = {
	{ "test",       0,      NULL,   't' },
	{ "umask",      1,      NULL,   'u' },
	{ "arg",        1,      NULL,   'a' },
	{ 0,            0,      0,      0   }
};

/* valid_name */
/* True or false? Is this a valid filename (upper/lower alpha, digits,
 * underscores, and hyphens only?)
 */
static int valid_name(const struct dirent *d)
{
	const char *c = d->d_name;

	while (*c) {
		if (!isalnum(*c) && (*c != '_') && (*c != '-')) {
			return 0;
		}
		++c;
	}
	return 1;
}

/* test mode = 1 is the same as official run_parts
 * test_mode = 2 means to fail silently on missing directories
 */
static int run_parts(char **args, const unsigned char test_mode)
{
	struct dirent **namelist = 0;
	struct stat st;
	char *filename;
	char *arg0 = args[0];
	int entries;
	int i;
	int exitstatus = 0;

#if __GNUC__
	/* Avoid longjmp clobbering */
	(void) &i;
	(void) &exitstatus;
#endif
	/* scandir() isn't POSIX, but it makes things easy. */
	entries = scandir(arg0, &namelist, valid_name, alphasort);

	if (entries == -1) {
		if (test_mode & 2) {
			return 2;
		}
		bb_perror_msg_and_die("cannot open '%s'", arg0);
	}

	for (i = 0; i < entries; i++) {
		filename = concat_path_file(arg0, namelist[i]->d_name);

		xstat(filename, &st);
		if (S_ISREG(st.st_mode) && !access(filename, X_OK)) {
			if (test_mode) {
				puts(filename);
			} else {
				/* exec_errno is common vfork variable */
				volatile int exec_errno = 0;
				int result;
				int pid;

				if ((pid = vfork()) < 0) {
					bb_perror_msg_and_die("failed to fork");
				} else if (!pid) {
					args[0] = filename;
					execve(filename, args, environ);
					exec_errno = errno;
					_exit(1);
				}

				waitpid(pid, &result, 0);
				if (exec_errno) {
					errno = exec_errno;
					bb_perror_msg("failed to exec %s", filename);
					exitstatus = 1;
				}
				if (WIFEXITED(result) && WEXITSTATUS(result)) {
					bb_perror_msg("%s exited with return code %d", filename, WEXITSTATUS(result));
					exitstatus = 1;
				} else if (WIFSIGNALED(result)) {
					bb_perror_msg("%s exited because of uncaught signal %d", filename, WTERMSIG(result));
					exitstatus = 1;
				}
			}
		} else if (!S_ISDIR(st.st_mode)) {
			bb_error_msg("component %s is not an executable plain file", filename);
			exitstatus = 1;
		}

		free(namelist[i]);
		free(filename);
	}
	free(namelist);

	return exitstatus;
}


/* run_parts_main */
/* Process options */
int run_parts_main(int argc, char **argv);
int run_parts_main(int argc, char **argv)
{
	char **args = xmalloc(2 * sizeof(char *));
	unsigned char test_mode = 0;
	unsigned short argcount = 1;
	int opt;

	umask(022);

	while ((opt = getopt_long(argc, argv, "tu:a:",
					runparts_long_options, NULL)) > 0)
	{
		switch (opt) {
		/* Enable test mode */
		case 't':
			test_mode++;
			break;
		/* Set the umask of the programs executed */
		case 'u':
			/* Check and set the umask of the program executed. As stated in the original
			 * run-parts, the octal conversion in libc is not foolproof; it will take the
			 * 8 and 9 digits under some circumstances. We'll just have to live with it.
			 */
			umask(xstrtoul_range(optarg, 8, 0, 07777));
			break;
		/* Pass an argument to the programs */
		case 'a':
			/* Add an argument to the commands that we will call.
			 * Called once for every argument. */
			args = xrealloc(args, (argcount + 2) * (sizeof(char *)));
			args[argcount++] = optarg;
			break;
		default:
			bb_show_usage();
		}
	}

	/* We require exactly one argument: the directory name */
	if (optind != (argc - 1)) {
		bb_show_usage();
	}

	args[0] = argv[optind];
	args[argcount] = 0;

	return run_parts(args, test_mode);
}