/* * Copyright (C) 2004-2005 Kay Sievers * * 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. * */ #define MY_MAX(a,b) ((a) > (b) ? (a) : (b)) #define READ_END 0 #define WRITE_END 1 static int run_program1(struct space *space, const char *command0, char *result, size_t ressize, size_t *reslen, int log); static int run_program0(struct space *space, const char *command0, char *result, size_t ressize, size_t *reslen, int log) { int retval = 0; 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; /* build argv from comand */ strlcpy(arg, command0, 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'", command0); /* prepare pipes from child to parent */ if (result || log) { if (pipe(outpipe) != 0) { Perror(space, "pipe failed: %s", strerror(errno)); return -1; } } if (log) { if (pipe(errpipe) != 0) { Perror(space, "pipe failed: %s", strerror(errno)); return -1; } } /* allow programs in /lib/alsa called without the path */ if (strchr(argv[0], '/') == NULL) { strlcpy(program, "/lib/alsa/", 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 Perror(space, "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); /* we should never reach this */ Perror(space, "exec of program '%s' failed", argv[0]); _exit(1); case -1: Perror(space, "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(MY_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) { Perror(space, "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 { Perror(space, "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) Perror(space, "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 { Perror(space, "'%s' abnormal exit", argv[0]); retval = -1; } } return retval; } static int run_program(struct space *space, const char *command0, char *result, size_t ressize, size_t *reslen, int log) { if (command0[0] == '_' && command0[1] == '_') return run_program1(space, command0, result, ressize, reslen, log); return run_program0(space, command0, result, ressize, reslen, log); }