[thirdparty/systemd.git] / udev_utils_run.c

/*
 * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
 *
 *	This program is free software; you can redistribute it and/or modify it
 *	under the terms of the GNU General Public License as published by the
 *	Free Software Foundation version 2 of the License.
 * 
 *	This program is distributed in the hope that it will be useful, but
 *	WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *	General Public License for more details.
 * 
 *	You should have received a copy of the GNU General Public License along
 *	with this program; if not, write to the Free Software Foundation, Inc.,
 *	51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */


#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <syslog.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <sys/select.h>

#include "udev.h"

extern char **environ;

int pass_env_to_socket(const char *sockname, const char *devpath, const char *action)
{
	int sock;
	struct sockaddr_un saddr;
	socklen_t addrlen;
	char buf[2048];
	size_t bufpos = 0;
	int i;
	ssize_t count;
	int retval = 0;

	dbg("pass environment to socket '%s'", sockname);
	sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
	memset(&saddr, 0x00, sizeof(struct sockaddr_un));
	saddr.sun_family = AF_LOCAL;
	/* abstract namespace only */
	strcpy(&saddr.sun_path[1], sockname);
	addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;

	bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath);
	bufpos++;
	for (i = 0; environ[i] != NULL && bufpos < sizeof(buf); i++) {
		bufpos += strlcpy(&buf[bufpos], environ[i], sizeof(buf) - bufpos-1);
		bufpos++;
	}

	count = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, addrlen);
	if (count < 0)
		retval = -1;
	info("passed %zi bytes to socket '%s', ", count, sockname);

	close(sock);
	return retval;
}

int run_program(const char *command, const char *subsystem,
		char *result, size_t ressize, size_t *reslen)
{
	int status;
	int outpipe[2] = {-1, -1};
	int errpipe[2] = {-1, -1};
	pid_t pid;
	char arg[PATH_SIZE];
	char program[PATH_SIZE];
	char *argv[(sizeof(arg) / 2) + 1];
	int devnull;
	int i;
	int retval = 0;

	/* build argv from comand */
	strlcpy(arg, command, sizeof(arg));
	i = 0;
	if (strchr(arg, ' ') != NULL) {
		char *pos = arg;

		while (pos != NULL) {
			if (pos[0] == '\'') {
				/* don't separate if in apostrophes */
				pos++;
				argv[i] = strsep(&pos, "\'");
				while (pos != NULL && pos[0] == ' ')
					pos++;
			} else {
				argv[i] = strsep(&pos, " ");
			}
			dbg("arg[%i] '%s'", i, argv[i]);
			i++;
		}
		argv[i] = NULL;
	} else {
		argv[0] = arg;
		argv[1] = NULL;
	}
	info("'%s'", command);

	/* prepare pipes from child to parent */
	if (result != NULL || udev_log_priority >= LOG_INFO) {
		if (pipe(outpipe) != 0) {
			err("pipe failed: %s", strerror(errno));
			return -1;
		}
	}
	if (udev_log_priority >= LOG_INFO) {
		if (pipe(errpipe) != 0) {
			err("pipe failed: %s", strerror(errno));
			return -1;
		}
	}

	/* allow programs in /lib/udev called without the path */
	if (strchr(argv[0], '/') == NULL) {
		strlcpy(program, "/lib/udev/", sizeof(program));
		strlcat(program, argv[0], sizeof(program));
		argv[0] = program;
	}

	pid = fork();
	switch(pid) {
	case 0:
		/* child closes parent ends of pipes */
		if (outpipe[READ_END] > 0)
			close(outpipe[READ_END]);
		if (errpipe[READ_END] > 0)
			close(errpipe[READ_END]);

		/* discard child output or connect to pipe */
		devnull = open("/dev/null", O_RDWR);
		if (devnull > 0) {
			dup2(devnull, STDIN_FILENO);
			if (outpipe[WRITE_END] < 0)
				dup2(devnull, STDOUT_FILENO);
			if (errpipe[WRITE_END] < 0)
				dup2(devnull, STDERR_FILENO);
			close(devnull);
		} else
			err("open /dev/null failed: %s", strerror(errno));
		if (outpipe[WRITE_END] > 0) {
			dup2(outpipe[WRITE_END], STDOUT_FILENO);
			close(outpipe[WRITE_END]);
		}
		if (errpipe[WRITE_END] > 0) {
			dup2(errpipe[WRITE_END], STDERR_FILENO);
			close(errpipe[WRITE_END]);
		}
		execv(argv[0], argv);
		if (errno == ENOENT || errno == ENOTDIR) {
			/* may be on a filesytem which is not mounted right now */
			info("program '%s' not found", argv[0]);
		} else {
			/* other problems */
			err("exec of program '%s' failed", argv[0]);
		}
		_exit(1);
	case -1:
		err("fork of '%s' failed: %s", argv[0], strerror(errno));
		return -1;
	default:
		/* read from child if requested */
		if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
			ssize_t count;
			size_t respos = 0;

			/* parent closes child ends of pipes */
			if (outpipe[WRITE_END] > 0)
				close(outpipe[WRITE_END]);
			if (errpipe[WRITE_END] > 0)
				close(errpipe[WRITE_END]);

			/* read child output */
			while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
				int fdcount;
				fd_set readfds;

				FD_ZERO(&readfds);
				if (outpipe[READ_END] > 0)
					FD_SET(outpipe[READ_END], &readfds);
				if (errpipe[READ_END] > 0)
					FD_SET(errpipe[READ_END], &readfds);
				fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
				if (fdcount < 0) {
					if (errno == EINTR)
						continue;
					retval = -1;
					break;
				}

				/* get stdout */
				if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
					char inbuf[1024];
					char *pos;
					char *line;

					count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
					if (count <= 0) {
						close(outpipe[READ_END]);
						outpipe[READ_END] = -1;
						if (count < 0) {
							err("stdin read failed: %s", strerror(errno));
							retval = -1;
						}
						continue;
					}
					inbuf[count] = '\0';

					/* store result for rule processing */
					if (result) {
						if (respos + count < ressize) {
							memcpy(&result[respos], inbuf, count);
							respos += count;
						} else {
							err("ressize %ld too short", (long)ressize);
							retval = -1;
						}
					}
					pos = inbuf;
					while ((line = strsep(&pos, "\n")))
						if (pos || line[0] != '\0')
							info("'%s' (stdout) '%s'", argv[0], line);
				}

				/* get stderr */
				if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
					char errbuf[1024];
					char *pos;
					char *line;

					count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
					if (count <= 0) {
						close(errpipe[READ_END]);
						errpipe[READ_END] = -1;
						if (count < 0)
							err("stderr read failed: %s", strerror(errno));
						continue;
					}
					errbuf[count] = '\0';
					pos = errbuf;
					while ((line = strsep(&pos, "\n")))
						if (pos || line[0] != '\0')
							info("'%s' (stderr) '%s'", argv[0], line);
				}
			}
			if (outpipe[READ_END] > 0)
				close(outpipe[READ_END]);
			if (errpipe[READ_END] > 0)
				close(errpipe[READ_END]);

			/* return the childs stdout string */
			if (result) {
				result[respos] = '\0';
				dbg("result='%s'", result);
				if (reslen)
					*reslen = respos;
			}
		}
		waitpid(pid, &status, 0);
		if (WIFEXITED(status)) {
			info("'%s' returned with status %i", argv[0], WEXITSTATUS(status));
			if (WEXITSTATUS(status) != 0)
				retval = -1;
		} else {
			err("'%s' abnormal exit", argv[0]);
			retval = -1;
		}
	}

	return retval;
}
Commit	Line	Data
59d6bfef	1	/*
59d6bfef KS	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.,
27b77df4	15	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
59d6bfef KS	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>
fb819f55	27	#include <syslog.h>
59d6bfef KS	28	#include <sys/socket.h>
	29	#include <sys/un.h>
	30	#include <sys/wait.h>
27f877e6	31	#include <sys/select.h>
59d6bfef	32
59d6bfef	33	#include "udev.h"
59d6bfef	34
aaa14841	35	extern char **environ;
59d6bfef KS	36
	37	int pass_env_to_socket(const char sockname, const char devpath, const char *action)
	38	{
	39	int sock;
	40	struct sockaddr_un saddr;
	41	socklen_t addrlen;
	42	char buf[2048];
	43	size_t bufpos = 0;
	44	int i;
40caaeec KS	45	ssize_t count;
40caaeec KS	46	int retval = 0;
59d6bfef KS	47
	48	dbg("pass environment to socket '%s'", sockname);
	49	sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
	50	memset(&saddr, 0x00, sizeof(struct sockaddr_un));
	51	saddr.sun_family = AF_LOCAL;
d8a57e7c	52	/* abstract namespace only */
59d6bfef KS	53	strcpy(&saddr.sun_path[1], sockname);
	54	addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
	55
	56	bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath);
	57	bufpos++;
	58	for (i = 0; environ[i] != NULL && bufpos < sizeof(buf); i++) {
	59	bufpos += strlcpy(&buf[bufpos], environ[i], sizeof(buf) - bufpos-1);
	60	bufpos++;
	61	}
	62
40caaeec KS	63	count = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, addrlen);
	64	if (count < 0)
	65	retval = -1;
	66	info("passed %zi bytes to socket '%s', ", count, sockname);
59d6bfef KS	67
	68	close(sock);
	69	return retval;
	70	}
	71
27f877e6	72	int run_program(const char command, const char subsystem,
fb819f55	73	char result, size_t ressize, size_t reslen)
59d6bfef	74	{
59d6bfef	75	int status;
27f877e6 KS	76	int outpipe[2] = {-1, -1};
27f877e6 KS	77	int errpipe[2] = {-1, -1};
59d6bfef	78	pid_t pid;
59d6bfef	79	char arg[PATH_SIZE];
aab4c0ee	80	char program[PATH_SIZE];
59d6bfef KS	81	char *argv[(sizeof(arg) / 2) + 1];
	82	int devnull;
	83	int i;
fb819f55	84	int retval = 0;
59d6bfef	85
36af2ddc	86	/* build argv from comand */
59d6bfef KS	87	strlcpy(arg, command, sizeof(arg));
59d6bfef KS	88	i = 0;
36af2ddc	89	if (strchr(arg, ' ') != NULL) {
40caaeec	90	char *pos = arg;
36af2ddc	91
59d6bfef KS	92	while (pos != NULL) {
	93	if (pos[0] == '\'') {
	94	/* don't separate if in apostrophes */
	95	pos++;
	96	argv[i] = strsep(&pos, "\'");
36af2ddc	97	while (pos != NULL && pos[0] == ' ')
59d6bfef KS	98	pos++;
	99	} else {
	100	argv[i] = strsep(&pos, " ");
	101	}
	102	dbg("arg[%i] '%s'", i, argv[i]);
	103	i++;
	104	}
27f877e6	105	argv[i] = NULL;
59d6bfef KS	106	} else {
59d6bfef KS	107	argv[0] = arg;
36af2ddc	108	argv[1] = NULL;
59d6bfef	109	}
36af2ddc	110	info("'%s'", command);
59d6bfef	111
27f877e6	112	/* prepare pipes from child to parent */
fb819f55	113	if (result != NULL \|\| udev_log_priority >= LOG_INFO) {
27f877e6	114	if (pipe(outpipe) != 0) {
ff3e4bed	115	err("pipe failed: %s", strerror(errno));
27f877e6 KS	116	return -1;
	117	}
	118	}
fb819f55	119	if (udev_log_priority >= LOG_INFO) {
27f877e6	120	if (pipe(errpipe) != 0) {
ff3e4bed	121	err("pipe failed: %s", strerror(errno));
59d6bfef KS	122	return -1;
	123	}
	124	}
	125
aab4c0ee KS	126	/* allow programs in /lib/udev called without the path */
	127	if (strchr(argv[0], '/') == NULL) {
	128	strlcpy(program, "/lib/udev/", sizeof(program));
	129	strlcat(program, argv[0], sizeof(program));
	130	argv[0] = program;
	131	}
	132
59d6bfef KS	133	pid = fork();
	134	switch(pid) {
	135	case 0:
27f877e6	136	/* child closes parent ends of pipes */
f1ff8d7b KS	137	if (outpipe[READ_END] > 0)
	138	close(outpipe[READ_END]);
	139	if (errpipe[READ_END] > 0)
	140	close(errpipe[READ_END]);
27f877e6 KS	141
27f877e6 KS	142	/* discard child output or connect to pipe */
59d6bfef	143	devnull = open("/dev/null", O_RDWR);
af5461f7 KS	144	if (devnull > 0) {
af5461f7 KS	145	dup2(devnull, STDIN_FILENO);
f1ff8d7b	146	if (outpipe[WRITE_END] < 0)
af5461f7	147	dup2(devnull, STDOUT_FILENO);
f1ff8d7b	148	if (errpipe[WRITE_END] < 0)
af5461f7 KS	149	dup2(devnull, STDERR_FILENO);
	150	close(devnull);
	151	} else
ff3e4bed	152	err("open /dev/null failed: %s", strerror(errno));
b83b2991	153	if (outpipe[WRITE_END] > 0) {
f1ff8d7b	154	dup2(outpipe[WRITE_END], STDOUT_FILENO);
b83b2991 MI	155	close(outpipe[WRITE_END]);
	156	}
	157	if (errpipe[WRITE_END] > 0) {
f1ff8d7b	158	dup2(errpipe[WRITE_END], STDERR_FILENO);
b83b2991 MI	159	close(errpipe[WRITE_END]);
b83b2991 MI	160	}
40caaeec	161	execv(argv[0], argv);
9b2e2d4a	162	if (errno == ENOENT \|\| errno == ENOTDIR) {
8246d00d SJR	163	/* may be on a filesytem which is not mounted right now */
	164	info("program '%s' not found", argv[0]);
	165	} else {
	166	/* other problems */
	167	err("exec of program '%s' failed", argv[0]);
	168	}
59d6bfef KS	169	_exit(1);
59d6bfef KS	170	case -1:
ff3e4bed	171	err("fork of '%s' failed: %s", argv[0], strerror(errno));
59d6bfef KS	172	return -1;
59d6bfef KS	173	default:
27f877e6	174	/* read from child if requested */
f1ff8d7b	175	if (outpipe[READ_END] > 0 \|\| errpipe[READ_END] > 0) {
853ccc43	176	ssize_t count;
27f877e6 KS	177	size_t respos = 0;
	178
	179	/* parent closes child ends of pipes */
f1ff8d7b KS	180	if (outpipe[WRITE_END] > 0)
	181	close(outpipe[WRITE_END]);
	182	if (errpipe[WRITE_END] > 0)
	183	close(errpipe[WRITE_END]);
27f877e6 KS	184
27f877e6 KS	185	/* read child output */
f1ff8d7b	186	while (outpipe[READ_END] > 0 \|\| errpipe[READ_END] > 0) {
27f877e6 KS	187	int fdcount;
	188	fd_set readfds;
	189
	190	FD_ZERO(&readfds);
f1ff8d7b KS	191	if (outpipe[READ_END] > 0)
	192	FD_SET(outpipe[READ_END], &readfds);
	193	if (errpipe[READ_END] > 0)
	194	FD_SET(errpipe[READ_END], &readfds);
	195	fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
27f877e6 KS	196	if (fdcount < 0) {
	197	if (errno == EINTR)
	198	continue;
59d6bfef KS	199	retval = -1;
	200	break;
	201	}
	202
27f877e6	203	/* get stdout */
f1ff8d7b	204	if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
27f877e6	205	char inbuf[1024];
40caaeec KS	206	char *pos;
40caaeec KS	207	char *line;
59d6bfef	208
f1ff8d7b	209	count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
27f877e6	210	if (count <= 0) {
f1ff8d7b KS	211	close(outpipe[READ_END]);
f1ff8d7b KS	212	outpipe[READ_END] = -1;
27f877e6	213	if (count < 0) {
ff3e4bed	214	err("stdin read failed: %s", strerror(errno));
27f877e6 KS	215	retval = -1;
	216	}
	217	continue;
	218	}
	219	inbuf[count] = '\0';
27f877e6	220
40caaeec	221	/* store result for rule processing */
27f877e6	222	if (result) {
40caaeec KS	223	if (respos + count < ressize) {
	224	memcpy(&result[respos], inbuf, count);
	225	respos += count;
	226	} else {
27f877e6 KS	227	err("ressize %ld too short", (long)ressize);
27f877e6 KS	228	retval = -1;
27f877e6	229	}
27f877e6	230	}
40caaeec KS	231	pos = inbuf;
	232	while ((line = strsep(&pos, "\n")))
	233	if (pos \|\| line[0] != '\0')
	234	info("'%s' (stdout) '%s'", argv[0], line);
27f877e6 KS	235	}
	236
	237	/* get stderr */
f1ff8d7b	238	if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
27f877e6	239	char errbuf[1024];
40caaeec KS	240	char *pos;
40caaeec KS	241	char *line;
27f877e6	242
f1ff8d7b	243	count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
27f877e6	244	if (count <= 0) {
f1ff8d7b KS	245	close(errpipe[READ_END]);
f1ff8d7b KS	246	errpipe[READ_END] = -1;
27f877e6	247	if (count < 0)
ff3e4bed	248	err("stderr read failed: %s", strerror(errno));
27f877e6 KS	249	continue;
	250	}
	251	errbuf[count] = '\0';
40caaeec KS	252	pos = errbuf;
	253	while ((line = strsep(&pos, "\n")))
	254	if (pos \|\| line[0] != '\0')
	255	info("'%s' (stderr) '%s'", argv[0], line);
59d6bfef KS	256	}
59d6bfef KS	257	}
f1ff8d7b KS	258	if (outpipe[READ_END] > 0)
	259	close(outpipe[READ_END]);
	260	if (errpipe[READ_END] > 0)
	261	close(errpipe[READ_END]);
27f877e6 KS	262
	263	/* return the childs stdout string */
	264	if (result) {
	265	result[respos] = '\0';
	266	dbg("result='%s'", result);
	267	if (reslen)
	268	*reslen = respos;
	269	}
59d6bfef KS	270	}
59d6bfef KS	271	waitpid(pid, &status, 0);
40caaeec KS	272	if (WIFEXITED(status)) {
	273	info("'%s' returned with status %i", argv[0], WEXITSTATUS(status));
	274	if (WEXITSTATUS(status) != 0)
	275	retval = -1;
	276	} else {
	277	err("'%s' abnormal exit", argv[0]);
59d6bfef KS	278	retval = -1;
	279	}
	280	}
	281
	282	return retval;
	283	}