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 <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 static void usage(void)
  54 {
  55         printf("Usage: udevcontrol COMMAND\n"
  56                 "  log_priority=<level>   set the udev log level for the daemon\n"
  57                 "  stop_exec_queue        keep udevd from executing events, queue only\n"
  58                 "  start_exec_queue       execute events, flush queue\n"
  59                 "  reload_rules           reloads the rules files\n"
  60                 "  max_childs=<N>         maximum number of childs\n"
  61                 "  max_childs_running=<N> maximum number of childs running at the same time\n"
  62                 "  --help                 print this help text\n\n");
  63 }
  64
  65 int main(int argc, char *argv[], char *envp[])
  66 {
  67         static struct udevd_ctrl_msg ctrl_msg;
  68         struct sockaddr_un saddr;
  69         socklen_t addrlen;
  70         const char *env;
  71         const char *val;
  72         int *intval;
  73         int i;
  74         int retval = 1;
  75
  76         env = getenv("UDEV_LOG");
  77         if (env)
  78                 udev_log = log_priority(env);
  79
  80         logging_init("udevcontrol");
  81         dbg("version %s", UDEV_VERSION);
  82
  83         if (argc < 2) {
  84                 fprintf(stderr, "missing command\n\n");
  85                 usage();
  86                 goto exit;
  87         }
  88
  89         memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
  90         strcpy(ctrl_msg.magic, UDEVD_CTRL_MAGIC);
  91
  92         for (i = 1 ; i < argc; i++) {
  93                 char *arg = argv[i];
  94
  95                 if (!strcmp(arg, "stop_exec_queue"))
  96                         ctrl_msg.type = UDEVD_CTRL_STOP_EXEC_QUEUE;
  97                 else if (!strcmp(arg, "start_exec_queue"))
  98                         ctrl_msg.type = UDEVD_CTRL_START_EXEC_QUEUE;
  99                 else if (!strcmp(arg, "reload_rules"))
 100                         ctrl_msg.type = UDEVD_CTRL_RELOAD_RULES;
 101                 else if (!strncmp(arg, "log_priority=", strlen("log_priority="))) {
 102                         intval = (int *) ctrl_msg.buf;
 103                         val = &arg[strlen("log_priority=")];
 104                         ctrl_msg.type = UDEVD_CTRL_SET_LOG_LEVEL;
 105                         *intval = log_priority(val);
 106                         info("send log_priority=%i", *intval);
 107                 } else if (!strncmp(arg, "max_childs=", strlen("max_childs="))) {
 108                         char *endp;
 109                         int count;
 110
 111                         intval = (int *) ctrl_msg.buf;
 112                         val = &arg[strlen("max_childs=")];
 113                         ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS;
 114                         count = strtoul(val, &endp, 0);
 115                         if (endp[0] != '\0' || count < 1) {
 116                                 fprintf(stderr, "invalid number\n");
 117                                 goto exit;
 118                         }
 119                         *intval = count;
 120                         info("send max_childs=%i", *intval);
 121                 } else if (!strncmp(arg, "max_childs_running=", strlen("max_childs_running="))) {
 122                         char *endp;
 123                         int count;
 124
 125                         intval = (int *) ctrl_msg.buf;
 126                         val = &arg[strlen("max_childs_running=")];
 127                         ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS_RUNNING;
 128                         count = strtoul(val, &endp, 0);
 129                         if (endp[0] != '\0' || count < 1) {
 130                                 fprintf(stderr, "invalid number\n");
 131                                 goto exit;
 132                         }
 133                         *intval = count;
 134                         info("send max_childs_running=%i", *intval);
 135                 } else if (strcmp(arg, "help") == 0  || strcmp(arg, "--help") == 0  || strcmp(arg, "-h") == 0) {
 136                         usage();
 137                         goto exit;
 138                 } else {
 139                         fprintf(stderr, "unknown option\n\n");
 140                         usage();
 141                         goto exit;
 142                 }
 143         }
 144
 145         if (getuid() != 0) {
 146                 fprintf(stderr, "need to be root, exit\n\n");
 147                 goto exit;
 148         }
 149
 150         sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 151         if (sock == -1) {
 152                 err("error getting socket: %s", strerror(errno));
 153                 goto exit;
 154         }
 155
 156         memset(&saddr, 0x00, sizeof(struct sockaddr_un));
 157         saddr.sun_family = AF_LOCAL;
 158         /* use abstract namespace for socket path */
 159         strcpy(&saddr.sun_path[1], UDEVD_CTRL_SOCK_PATH);
 160         addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
 161
 162         retval = sendto(sock, &ctrl_msg, sizeof(ctrl_msg), 0, (struct sockaddr *)&saddr, addrlen);
 163         if (retval == -1) {
 164                 err("error sending message: %s", strerror(errno));
 165                 retval = 1;
 166         } else {
 167                 dbg("sent message type=0x%02x, %u bytes sent", ctrl_msg.type, retval);
 168                 retval = 0;
 169         }
 170
 171         close(sock);
 172 exit:
 173         logging_close();
 174         return retval;
 175 }