udevcontrol.c

   1 /*
   2  * udevcontrol.c
   3  *
   4  * Copyright (C) 2005-2006 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 <time.h>
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <stddef.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <sys/types.h>
  29 #include <sys/socket.h>
  30 #include <sys/wait.h>
  31 #include <sys/un.h>
  32
  33 #include "udev.h"
  34 #include "udevd.h"
  35
  36 static int sock = -1;
  37 static int udev_log = 0;
  38
  39 #ifdef USE_LOG
  40 void log_message (int priority, const char *format, ...)
  41 {
  42         va_list args;
  43
  44         if (priority > udev_log)
  45                 return;
  46
  47         va_start(args, format);
  48         vsyslog(priority, format, args);
  49         va_end(args);
  50 }
  51 #endif
  52
  53 int main(int argc, char *argv[], char *envp[])
  54 {
  55         static struct udevd_ctrl_msg ctrl_msg;
  56         struct sockaddr_un saddr;
  57         socklen_t addrlen;
  58         const char *env;
  59         const char *val;
  60         int *intval;
  61         int i;
  62         int retval = 1;
  63
  64         env = getenv("UDEV_LOG");
  65         if (env)
  66                 udev_log = log_priority(env);
  67
  68         logging_init("udevcontrol");
  69         dbg("version %s", UDEV_VERSION);
  70
  71         if (argc < 2) {
  72                 fprintf(stderr, "missing command\n\n");
  73                 goto exit;
  74         }
  75
  76         memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
  77         strcpy(ctrl_msg.magic, UDEVD_CTRL_MAGIC);
  78
  79         for (i = 1 ; i < argc; i++) {
  80                 char *arg = argv[i];
  81
  82                 if (!strcmp(arg, "stop_exec_queue"))
  83                         ctrl_msg.type = UDEVD_CTRL_STOP_EXEC_QUEUE;
  84                 else if (!strcmp(arg, "start_exec_queue"))
  85                         ctrl_msg.type = UDEVD_CTRL_START_EXEC_QUEUE;
  86                 else if (!strcmp(arg, "reload_rules"))
  87                         ctrl_msg.type = UDEVD_CTRL_RELOAD_RULES;
  88                 else if (!strncmp(arg, "log_priority=", strlen("log_priority="))) {
  89                         intval = (int *) ctrl_msg.buf;
  90                         val = &arg[strlen("log_priority=")];
  91                         ctrl_msg.type = UDEVD_CTRL_SET_LOG_LEVEL;
  92                         *intval = log_priority(val);
  93                         info("send log_priority=%i", *intval);
  94                 } else if (!strncmp(arg, "max_childs=", strlen("max_childs="))) {
  95                         char *endp;
  96                         int count;
  97
  98                         intval = (int *) ctrl_msg.buf;
  99                         val = &arg[strlen("max_childs=")];
 100                         ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS;
 101                         count = strtoul(val, &endp, 0);
 102                         if (endp[0] != '\0' || count < 1) {
 103                                 fprintf(stderr, "invalid number\n");
 104                                 goto exit;
 105                         }
 106                         *intval = count;
 107                         info("send max_childs=%i", *intval);
 108                 } else if (!strncmp(arg, "max_childs_running=", strlen("max_childs_running="))) {
 109                         char *endp;
 110                         int count;
 111
 112                         intval = (int *) ctrl_msg.buf;
 113                         val = &arg[strlen("max_childs_running=")];
 114                         ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS_RUNNING;
 115                         count = strtoul(val, &endp, 0);
 116                         if (endp[0] != '\0' || count < 1) {
 117                                 fprintf(stderr, "invalid number\n");
 118                                 goto exit;
 119                         }
 120                         *intval = count;
 121                         info("send max_childs_running=%i", *intval);
 122                 } else if (strcmp(arg, "help") == 0  || strcmp(arg, "--help") == 0  || strcmp(arg, "-h") == 0) {
 123                         printf("Usage: udevcontrol COMMAND\n"
 124                                 "  log_priority=<level>   set the udev log level for the daemon\n"
 125                                 "  stop_exec_queue        keep udevd from executing events, queue only\n"
 126                                 "  start_exec_queue       execute events, flush queue\n"
 127                                 "  reload_rules           reloads the rules files\n"
 128                                 "  max_childs=<N>         maximum number of childs\n"
 129                                 "  max_childs_running=<N> maximum number of childs running at the same time\n"
 130                                 "  --help                 print this help text\n\n");
 131                         goto exit;
 132                 } else {
 133                         fprintf(stderr, "unrecognized command '%s'\n", arg);
 134                         goto exit;
 135                 }
 136         }
 137
 138         if (getuid() != 0) {
 139                 fprintf(stderr, "root privileges required\n");
 140                 goto exit;
 141         }
 142
 143         sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 144         if (sock == -1) {
 145                 err("error getting socket: %s", strerror(errno));
 146                 goto exit;
 147         }
 148
 149         memset(&saddr, 0x00, sizeof(struct sockaddr_un));
 150         saddr.sun_family = AF_LOCAL;
 151         /* use abstract namespace for socket path */
 152         strcpy(&saddr.sun_path[1], UDEVD_CTRL_SOCK_PATH);
 153         addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
 154
 155         retval = sendto(sock, &ctrl_msg, sizeof(ctrl_msg), 0, (struct sockaddr *)&saddr, addrlen);
 156         if (retval == -1) {
 157                 err("error sending message: %s", strerror(errno));
 158                 retval = 1;
 159         } else {
 160                 dbg("sent message type=0x%02x, %u bytes sent", ctrl_msg.type, retval);
 161                 retval = 0;
 162         }
 163
 164         close(sock);
 165 exit:
 166         logging_close();
 167         return retval;
 168 }