2 * udev_utils_run.c - execute programs from udev and read its output
4 * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <sys/socket.h>
32 #include <sys/select.h>
36 extern char **environ;
38 int pass_env_to_socket(const char *sockname, const char *devpath, const char *action)
41 struct sockaddr_un saddr;
49 dbg("pass environment to socket '%s'", sockname);
50 sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
51 memset(&saddr, 0x00, sizeof(struct sockaddr_un));
52 saddr.sun_family = AF_LOCAL;
53 /* abstract namespace only */
54 strcpy(&saddr.sun_path[1], sockname);
55 addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
57 bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath);
59 for (i = 0; environ[i] != NULL && bufpos < sizeof(buf); i++) {
60 bufpos += strlcpy(&buf[bufpos], environ[i], sizeof(buf) - bufpos-1);
64 count = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, addrlen);
67 info("passed %zi bytes to socket '%s', ", count, sockname);
73 int run_program(const char *command, const char *subsystem,
74 char *result, size_t ressize, size_t *reslen, int log)
78 int outpipe[2] = {-1, -1};
79 int errpipe[2] = {-1, -1};
82 char program[PATH_SIZE];
83 char *argv[(sizeof(arg) / 2) + 1];
87 /* build argv from comand */
88 strlcpy(arg, command, sizeof(arg));
90 if (strchr(arg, ' ') != NULL) {
95 /* don't separate if in apostrophes */
97 argv[i] = strsep(&pos, "\'");
98 while (pos != NULL && pos[0] == ' ')
101 argv[i] = strsep(&pos, " ");
103 dbg("arg[%i] '%s'", i, argv[i]);
111 info("'%s'", command);
113 /* prepare pipes from child to parent */
115 if (pipe(outpipe) != 0) {
116 err("pipe failed: %s", strerror(errno));
121 if (pipe(errpipe) != 0) {
122 err("pipe failed: %s", strerror(errno));
127 /* allow programs in /lib/udev called without the path */
128 if (strchr(argv[0], '/') == NULL) {
129 strlcpy(program, "/lib/udev/", sizeof(program));
130 strlcat(program, argv[0], sizeof(program));
137 /* child closes parent ends of pipes */
138 if (outpipe[READ_END] > 0)
139 close(outpipe[READ_END]);
140 if (errpipe[READ_END] > 0)
141 close(errpipe[READ_END]);
143 /* discard child output or connect to pipe */
144 devnull = open("/dev/null", O_RDWR);
146 dup2(devnull, STDIN_FILENO);
147 if (outpipe[WRITE_END] < 0)
148 dup2(devnull, STDOUT_FILENO);
149 if (errpipe[WRITE_END] < 0)
150 dup2(devnull, STDERR_FILENO);
153 err("open /dev/null failed: %s", strerror(errno));
154 if (outpipe[WRITE_END] > 0)
155 dup2(outpipe[WRITE_END], STDOUT_FILENO);
156 if (errpipe[WRITE_END] > 0)
157 dup2(errpipe[WRITE_END], STDERR_FILENO);
158 execv(argv[0], argv);
160 /* we should never reach this */
161 err("exec of program '%s' failed", argv[0]);
164 err("fork of '%s' failed: %s", argv[0], strerror(errno));
167 /* read from child if requested */
168 if (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
172 /* parent closes child ends of pipes */
173 if (outpipe[WRITE_END] > 0)
174 close(outpipe[WRITE_END]);
175 if (errpipe[WRITE_END] > 0)
176 close(errpipe[WRITE_END]);
178 /* read child output */
179 while (outpipe[READ_END] > 0 || errpipe[READ_END] > 0) {
184 if (outpipe[READ_END] > 0)
185 FD_SET(outpipe[READ_END], &readfds);
186 if (errpipe[READ_END] > 0)
187 FD_SET(errpipe[READ_END], &readfds);
188 fdcount = select(UDEV_MAX(outpipe[READ_END], errpipe[READ_END])+1, &readfds, NULL, NULL, NULL);
197 if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
202 count = read(outpipe[READ_END], inbuf, sizeof(inbuf)-1);
204 close(outpipe[READ_END]);
205 outpipe[READ_END] = -1;
207 err("stdin read failed: %s", strerror(errno));
214 /* store result for rule processing */
216 if (respos + count < ressize) {
217 memcpy(&result[respos], inbuf, count);
220 err("ressize %ld too short", (long)ressize);
225 while ((line = strsep(&pos, "\n")))
226 if (pos || line[0] != '\0')
227 info("'%s' (stdout) '%s'", argv[0], line);
231 if (errpipe[READ_END] > 0 && FD_ISSET(errpipe[READ_END], &readfds)) {
236 count = read(errpipe[READ_END], errbuf, sizeof(errbuf)-1);
238 close(errpipe[READ_END]);
239 errpipe[READ_END] = -1;
241 err("stderr read failed: %s", strerror(errno));
244 errbuf[count] = '\0';
246 while ((line = strsep(&pos, "\n")))
247 if (pos || line[0] != '\0')
248 info("'%s' (stderr) '%s'", argv[0], line);
251 if (outpipe[READ_END] > 0)
252 close(outpipe[READ_END]);
253 if (errpipe[READ_END] > 0)
254 close(errpipe[READ_END]);
256 /* return the childs stdout string */
258 result[respos] = '\0';
259 dbg("result='%s'", result);
264 waitpid(pid, &status, 0);
265 if (WIFEXITED(status)) {
266 info("'%s' returned with status %i", argv[0], WEXITSTATUS(status));
267 if (WEXITSTATUS(status) != 0)
270 err("'%s' abnormal exit", argv[0]);