udevcontrol.c

   1 /*
   2  * udevcontrol.c
   3  *
   4  * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
   5  *
   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.
   9  *
  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.
  14  *
  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.
  18  *
  19  */
  20
  21 #include <sys/types.h>
  22 #include <sys/socket.h>
  23 #include <sys/wait.h>
  24 #include <sys/un.h>
  25 #include <time.h>
  26 #include <errno.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <stddef.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32 #include <linux/stddef.h>
  33
  34 #include "udev.h"
  35 #include "udev_version.h"
  36 #include "udevd.h"
  37 #include "udev_utils.h"
  38 #include "logging.h"
  39
  40 /* global variables */
  41 static int sock = -1;
  42 static int udev_log = 0;
  43
  44 #ifdef USE_LOG
  45 void log_message (int priority, const char *format, ...)
  46 {
  47         va_list args;
  48
  49         if (priority > udev_log)
  50                 return;
  51
  52         va_start(args, format);
  53         vsyslog(priority, format, args);
  54         va_end(args);
  55 }
  56 #endif
  57
  58
  59 int main(int argc, char *argv[], char *envp[])
  60 {
  61         static struct udevd_msg usend_msg;
  62         struct sockaddr_un saddr;
  63         socklen_t addrlen;
  64         const char *env;
  65         const char *val;
  66         int *intval;
  67         int i;
  68         int retval = 1;
  69
  70         env = getenv("UDEV_LOG");
  71         if (env)
  72                 udev_log = log_priority(env);
  73
  74         logging_init("udevcontrol");
  75         dbg("version %s", UDEV_VERSION);
  76
  77         if (argc < 2) {
  78                 fprintf(stderr, "missing command\n\n");
  79                 goto exit;
  80         }
  81
  82         memset(&usend_msg, 0x00, sizeof(struct udevd_msg));
  83         strcpy(usend_msg.magic, UDEV_MAGIC);
  84
  85         for (i = 1 ; i < argc; i++) {
  86                 char *arg = argv[i];
  87
  88                 if (!strcmp(arg, "stop_exec_queue"))
  89                         usend_msg.type = UDEVD_STOP_EXEC_QUEUE;
  90                 else if (!strcmp(arg, "start_exec_queue"))
  91                         usend_msg.type = UDEVD_START_EXEC_QUEUE;
  92                 else if (!strcmp(arg, "reload_rules"))
  93                         usend_msg.type = UDEVD_RELOAD_RULES;
  94                 else if (!strncmp(arg, "log_priority=", strlen("log_priority="))) {
  95                         intval = (int *) usend_msg.envbuf;
  96                         val = &arg[strlen("log_priority=")];
  97                         usend_msg.type = UDEVD_SET_LOG_LEVEL;
  98                         *intval = log_priority(val);
  99                         info("send log_priority=%i", *intval);
 100                 } else if (!strncmp(arg, "max_childs=", strlen("max_childs="))) {
 101                         intval = (int *) usend_msg.envbuf;
 102                         val = &arg[strlen("max_childs=")];
 103                         usend_msg.type = UDEVD_SET_MAX_CHILDS;
 104                         *intval = atoi(val);
 105                         info("send max_childs=%i", *intval);
 106                 } else if (strcmp(arg, "help") == 0  || strcmp(arg, "--help") == 0  || strcmp(arg, "-h") == 0) {
 107                         printf("Usage: udevcontrol COMMAND\n"
 108                                 "  log_priority=<level> set the udev log level for the daemon\n"
 109                                 "  stop_exec_queue      keep udevd from executing events, queue only\n"
 110                                 "  start_exec_queue     execute events, flush queue\n"
 111                                 "  reload_rules         reloads the rules files\n"
 112                                 "  max_childs=<N>       maximum number of childs running at the same time\n"
 113                                 "  --help               print this help text\n\n");
 114                         exit(0);
 115                 } else {
 116                         fprintf(stderr, "unknown option\n\n");
 117                         exit(1);
 118                 }
 119         }
 120
 121         if (getuid() != 0) {
 122                 fprintf(stderr, "need to be root, exit\n\n");
 123                 exit(1);
 124         }
 125
 126         sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 127         if (sock == -1) {
 128                 err("error getting socket: %s", strerror(errno));
 129                 goto exit;
 130         }
 131
 132         memset(&saddr, 0x00, sizeof(struct sockaddr_un));
 133         saddr.sun_family = AF_LOCAL;
 134         /* use abstract namespace for socket path */
 135         strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
 136         addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
 137
 138
 139         retval = sendto(sock, &usend_msg, sizeof(usend_msg), 0, (struct sockaddr *)&saddr, addrlen);
 140         if (retval == -1) {
 141                 err("error sending message: %s", strerror(errno));
 142                 retval = 1;
 143         } else {
 144                 dbg("sent message type=0x%02x, %u bytes sent", usend_msg.type, retval);
 145                 retval = 0;
 146         }
 147
 148         close(sock);
 149
 150 exit:
 151         logging_close();
 152
 153         return retval;
 154 }