/* * udev_utils_run.c - execute programs from udev and read its output * * 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., * 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include #include #include #include #include #include #include #include #include #include #include #include "udev_libc_wrapper.h" #include "udev.h" #include "logging.h" #include "udev_utils.h" #include "list.h" 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; /* only abstract namespace is supported */ 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 log) { int retval = 0; int status; int outpipe[2] = {-1, -1}; int errpipe[2] = {-1, -1}; pid_t pid; char arg[PATH_SIZE]; char *argv[(sizeof(arg) / 2) + 1]; int devnull; int i; strlcpy(arg, command, sizeof(arg)); i = 0; if (strchr(arg, ' ')) { char *pos = arg; while (pos != NULL) { if (pos[0] == '\'') { /* don't separate if in apostrophes */ pos++; argv[i] = strsep(&pos, "\'"); while (pos && pos[0] == ' ') pos++; } else { argv[i] = strsep(&pos, " "); } dbg("arg[%i] '%s'", i, argv[i]); i++; } argv[i] = NULL; info("'%s'", command); } else { argv[0] = arg; argv[1] = (char *) subsystem; argv[2] = NULL; info("'%s' '%s'", arg, argv[1]); } /* prepare pipes from child to parent */ if (result || log) { if (pipe(outpipe) != 0) { err("pipe failed"); return -1; } } if (log) { if (pipe(errpipe) != 0) { err("pipe failed"); return -1; } } 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"); if (outpipe[WRITE_END] > 0) dup2(outpipe[WRITE_END], STDOUT_FILENO); if (errpipe[WRITE_END] > 0) dup2(errpipe[WRITE_END], STDERR_FILENO); execv(argv[0], argv); /* we should never reach this */ err("exec of program '%s' failed", argv[0]); _exit(1); case -1: err("fork of '%s' failed", argv[0]); 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 with '%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 with '%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; }