1/*
2 * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
3 *
4 *	This program is free software; you can redistribute it and/or modify it
5 *	under the terms of the GNU General Public License as published by the
6 *	Free Software Foundation version 2 of the License.
7 *
8 *	This program is distributed in the hope that it will be useful, but
9 *	WITHOUT ANY WARRANTY; without even the implied warranty of
10 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
11 *	General Public License for more details.
12 *
13 *	You should have received a copy of the GNU General Public License along
14 *	with this program; if not, write to the Free Software Foundation, Inc.,
15 *	51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
16 *
17 */
18
19
20#include <stdlib.h>
21#include <stdio.h>
22#include <stddef.h>
23#include <unistd.h>
24#include <fcntl.h>
25#include <errno.h>
26#include <ctype.h>
27#include <sys/socket.h>
28#include <sys/un.h>
29#include <sys/wait.h>
30#include <sys/select.h>
31
32#include "udev.h"
33
34extern char **environ;
35
36int pass_env_to_socket(const char *sockname, const char *devpath, const char *action)
37{
38	int sock;
39	struct sockaddr_un saddr;
40	socklen_t addrlen;
41	char buf[2048];
42	size_t bufpos = 0;
43	int i;
44	ssize_t count;
45	int retval = 0;
46
47	dbg("pass environment to socket '%s'", sockname);
48	sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
49	memset(&saddr, 0x00, sizeof(struct sockaddr_un));
50	saddr.sun_family = AF_LOCAL;
51	/* abstract namespace only */
52	strcpy(&saddr.sun_path[1], sockname);
53	addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
54
55	bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath);
56	bufpos++;
57	for (i = 0; environ[i] != NULL && bufpos < sizeof(buf); i++) {
58		bufpos += strlcpy(&buf[bufpos], environ[i], sizeof(buf) - bufpos-1);
59		bufpos++;
60	}
61
62	count = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, addrlen);
63	if (count < 0)
64		retval = -1;
65	info("passed %zi bytes to socket '%s', ", count, sockname);
66
67	close(sock);
68	return retval;
69}
70
71int run_program(const char *command, const char *subsystem,
72		char *result, size_t ressize, size_t *reslen, int log)
73{
74	int retval = 0;
75	int status;
76	int outpipe[2] = {-1, -1};
77	int errpipe[2] = {-1, -1};
78	pid_t pid;
79	char arg[PATH_SIZE];
80	char program[PATH_SIZE];
81	char *argv[(sizeof(arg) / 2) + 1];
82	int devnull;
83	int i;
84
85	/* build argv from comand */
86	strlcpy(arg, command, sizeof(arg));
87	i = 0;
88	if (strchr(arg, ' ') != NULL) {
89		char *pos = arg;
90
91		while (pos != NULL) {
92			if (pos[0] == '\'') {
93				/* don't separate if in apostrophes */
94				pos++;
95				argv[i] = strsep(&pos, "\'");
96				while (pos != NULL && pos[0] == ' ')
97					pos++;
98			} else {
99				argv[i] = strsep(&pos, " ");
100			}
101			dbg("arg[%i] '%s'", i, argv[i]);
102			i++;
103		}
104		argv[i] = NULL;
105	} else {
106		argv[0] = arg;
107		argv[1] = NULL;
108	}
109	info("'%s'", command);
110
111	/* prepare pipes from child to parent */
112	if (result || log) {
113		if (pipe(outpipe) != 0) {
114			err("pipe failed: %s", strerror(errno));
115			return -1;
116		}
117	}
118	if (log) {
119		if (pipe(errpipe) != 0) {
120			err("pipe failed: %s", strerror(errno));
121			return -1;
122		}
123	}
124
125	/* allow programs in /lib/udev called without the path */
126	if (strchr(argv[0], '/') == NULL) {
127		strlcpy(program, "/lib/udev/", sizeof(program));
128		strlcat(program, argv[0], sizeof(program));
129		argv[0] = program;
130	}
131
132	pid = fork();
133	switch(pid) {
134	case 0:
135		/* child closes parent ends of pipes */
136		if (outpipe[READ_END] > 0)
137			close(outpipe[READ_END]);
138		if (errpipe[READ_END] > 0)
139			close(errpipe[READ_END]);
140
141		/* discard child output or connect to pipe */
142		devnull = open("/dev/null", O_RDWR);
143		if (devnull > 0) {
144			dup2(devnull, STDIN_FILENO);
145			if (outpipe[WRITE_END] < 0)
146				dup2(devnull, STDOUT_FILENO);
147			if (errpipe[WRITE_END] < 0)
148				dup2(devnull, STDERR_FILENO);
149			close(devnull);
150		} else
151			err("open /dev/null failed: %s", strerror(errno));
152		if (outpipe[WRITE_END] > 0) {
153			dup2(outpipe[WRITE_END], STDOUT_FILENO);
154			close(outpipe[WRITE_END]);
155		}
156		if (errpipe[WRITE_END] > 0) {
157			dup2(errpipe[WRITE_END], STDERR_FILENO);
158			close(errpipe[WRITE_END]);
159		}
160		execv(argv[0], argv);
161		if (errno == ENOENT || errno == ENOTDIR) {
162			/* may be on a filesytem which is not mounted right now */
163			info("program '%s' not found", argv[0]);
164		} else {
165			/* other problems */
166			err("exec of program '%s' failed", argv[0]);
167		}
168		_exit(1);
169	case -1:
170		err("fork of '%s' failed: %s", argv[0], strerror(errno));
171		return -1;
172	default:
173		/* read from child if requested */
174		if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
175			ssize_t count;
176			size_t respos = 0;
177
178			/* parent closes child ends of pipes */
179			if (outpipe[WRITE_END] > 0)
180				close(outpipe[WRITE_END]);
181			if (errpipe[WRITE_END] > 0)
182				close(errpipe[WRITE_END]);
183
184			/* read child output */
185			while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
186				int fdcount;
187				fd_set readfds;
188
189				FD_ZERO(&readfds);
190				if (outpipe[READ_END] > 0)
191					FD_SET(outpipe[READ_END], &readfds);
192				if (errpipe[READ_END] > 0)
193					FD_SET(errpipe[READ_END], &readfds);
194				fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
195				if (fdcount < 0) {
196					if (errno == EINTR)
197						continue;
198					retval = -1;
199					break;
200				}
201
202				/* get stdout */
203				if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
204					char inbuf[1024];
205					char *pos;
206					char *line;
207
208					count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
209					if (count <= 0) {
210						close(outpipe[READ_END]);
211						outpipe[READ_END] = -1;
212						if (count < 0) {
213							err("stdin read failed: %s", strerror(errno));
214							retval = -1;
215						}
216						continue;
217					}
218					inbuf[count] = '\0';
219
220					/* store result for rule processing */
221					if (result) {
222						if (respos + count < ressize) {
223							memcpy(&result[respos], inbuf, count);
224							respos += count;
225						} else {
226							err("ressize %ld too short", (long)ressize);
227							retval = -1;
228						}
229					}
230					pos = inbuf;
231					while ((line = strsep(&pos, "\n")))
232						if (pos || line[0] != '\0')
233							info("'%s' (stdout) '%s'", argv[0], line);
234				}
235
236				/* get stderr */
237				if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
238					char errbuf[1024];
239					char *pos;
240					char *line;
241
242					count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
243					if (count <= 0) {
244						close(errpipe[READ_END]);
245						errpipe[READ_END] = -1;
246						if (count < 0)
247							err("stderr read failed: %s", strerror(errno));
248						continue;
249					}
250					errbuf[count] = '\0';
251					pos = errbuf;
252					while ((line = strsep(&pos, "\n")))
253						if (pos || line[0] != '\0')
254							info("'%s' (stderr) '%s'", argv[0], line);
255				}
256			}
257			if (outpipe[READ_END] > 0)
258				close(outpipe[READ_END]);
259			if (errpipe[READ_END] > 0)
260				close(errpipe[READ_END]);
261
262			/* return the childs stdout string */
263			if (result) {
264				result[respos] = '\0';
265				dbg("result='%s'", result);
266				if (reslen)
267					*reslen = respos;
268			}
269		}
270		waitpid(pid, &status, 0);
271		if (WIFEXITED(status)) {
272			info("'%s' returned with status %i", argv[0], WEXITSTATUS(status));
273			if (WEXITSTATUS(status) != 0)
274				retval = -1;
275		} else {
276			err("'%s' abnormal exit", argv[0]);
277			retval = -1;
278		}
279	}
280
281	return retval;
282}
283