chiark / gitweb /
make ATTR{[$SUBSYSTEM/$KERNEL]<attr>}="<value>" working
[elogind.git] / udev_utils_run.c
index c2e77cb..1a92cdd 100644 (file)
@@ -1,6 +1,4 @@
 /*
- * udev_utils_run.c - execute programs from udev and read its output
- *
  * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
  *
  *     This program is free software; you can redistribute it and/or modify it
@@ -14,7 +12,7 @@
  * 
  *     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.
+ *     51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  *
  */
 
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <sys/wait.h>
+#include <sys/select.h>
 
-#include "udev_libc_wrapper.h"
 #include "udev.h"
-#include "logging.h"
-#include "udev_utils.h"
-#include "list.h"
 
+extern char **environ;
 
 int pass_env_to_socket(const char *sockname, const char *devpath, const char *action)
 {
@@ -45,13 +41,14 @@ int pass_env_to_socket(const char *sockname, const char *devpath, const char *ac
        char buf[2048];
        size_t bufpos = 0;
        int i;
-       int retval;
+       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 */
+       /* abstract namespace only */
        strcpy(&saddr.sun_path[1], sockname);
        addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
 
@@ -62,39 +59,41 @@ int pass_env_to_socket(const char *sockname, const char *devpath, const char *ac
                bufpos++;
        }
 
-       retval = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, addrlen);
-       if (retval != -1)
-               retval = 0;
+       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 execute_program(const char *command, const char *subsystem,
-                   char *result, size_t ressize, size_t *reslen)
+int run_program(const char *command, const char *subsystem,
+               char *result, size_t ressize, size_t *reslen, int log)
 {
        int retval = 0;
-       int count;
        int status;
-       int pipefds[2];
+       int outpipe[2] = {-1, -1};
+       int errpipe[2] = {-1, -1};
        pid_t pid;
-       char *pos;
        char arg[PATH_SIZE];
+       char program[PATH_SIZE];
        char *argv[(sizeof(arg) / 2) + 1];
        int devnull;
        int i;
-       size_t len;
 
+       /* build argv from comand */
        strlcpy(arg, command, sizeof(arg));
        i = 0;
-       if (strchr(arg, ' ')) {
-               pos = arg;
+       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 && pos[0] == ' ')
+                               while (pos != NULL && pos[0] == ' ')
                                        pos++;
                        } else {
                                argv[i] = strsep(&pos, " ");
@@ -102,78 +101,182 @@ int execute_program(const char *command, const char *subsystem,
                        dbg("arg[%i] '%s'", i, argv[i]);
                        i++;
                }
-               argv[i] =  NULL;
-               dbg("execute '%s' with parsed arguments", arg);
+               argv[i] = NULL;
        } else {
                argv[0] = arg;
-               argv[1] = (char *) subsystem;
-               argv[2] = NULL;
-               dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
+               argv[1] = NULL;
        }
+       info("'%s'", command);
 
-       if (result) {
-               if (pipe(pipefds) != 0) {
-                       err("pipe failed");
+       /* prepare pipes from child to parent */
+       if (result || log) {
+               if (pipe(outpipe) != 0) {
+                       err("pipe failed: %s", strerror(errno));
+                       return -1;
+               }
+       }
+       if (log) {
+               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 dup2 write side of pipe to STDOUT */
+               /* 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) {
+               if (devnull > 0) {
                        dup2(devnull, STDIN_FILENO);
-                       if (!result)
+                       if (outpipe[WRITE_END] < 0)
                                dup2(devnull, STDOUT_FILENO);
-                       dup2(devnull, STDERR_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]);
                }
-               if (result)
-                       dup2(pipefds[1], STDOUT_FILENO);
-               execv(arg, argv);
-               err("exec of program failed");
                _exit(1);
        case -1:
-               err("fork of '%s' failed", arg);
+               err("fork of '%s' failed: %s", argv[0], strerror(errno));
                return -1;
        default:
-               /* parent reads from pipefds[0] */
-               if (result) {
-                       close(pipefds[1]);
-                       len = 0;
-                       while (1) {
-                               count = read(pipefds[0], result + len, ressize - len-1);
-                               if (count < 0) {
-                                       err("read failed with '%s'", strerror(errno));
+               /* 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;
                                }
 
-                               if (count == 0)
-                                       break;
+                               /* get stdout */
+                               if (outpipe[READ_END] > 0 && FD_ISSET(outpipe[READ_END], &readfds)) {
+                                       char inbuf[1024];
+                                       char *pos;
+                                       char *line;
 
-                               len += count;
-                               if (len >= ressize-1) {
-                                       err("ressize %ld too short", (long)ressize);
-                                       retval = -1;
-                                       break;
+                                       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);
                                }
                        }
-                       result[len] = '\0';
-                       close(pipefds[0]);
-                       if (reslen)
-                               *reslen = len;
+                       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) || (WEXITSTATUS(status) != 0)) {
-                       dbg("exec program status 0x%x", status);
+               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;
 }
-