release/src/router/udev/udevcontrol.c

   1 /*
   2  * Copyright (C) 2005-2006 Kay Sievers <kay.sievers@vrfy.org>
   3  *
   4  *      This program is free software; you can redistribute it and/or modify it
   5  *      under the terms of the GNU General Public License as published by the
   6  *      Free Software Foundation version 2 of the License.
   7  *
   8  *      This program is distributed in the hope that it will be useful, but
   9  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  *      General Public License for more details.
  12  *
  13  *      You should have received a copy of the GNU General Public License along
  14  *      with this program; if not, write to the Free Software Foundation, Inc.,
  15  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16  *
  17  */
  18
  19 #include <time.h>
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <stddef.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28 #include <sys/wait.h>
  29 #include <sys/un.h>
  30
  31 #include "udev.h"
  32 #include "udevd.h"
  33
  34 static int sock = -1;
  35 static int udev_log = 0;
  36
  37 #ifdef USE_LOG
  38 void log_message (int priority, const char *format, ...)
  39 {
  40         va_list args;
  41
  42         if (priority > udev_log)
  43                 return;
  44
  45         va_start(args, format);
  46         vsyslog(priority, format, args);
  47         va_end(args);
  48 }
  49 #endif
  50
  51 int main(int argc, char *argv[], char *envp[])
  52 {
  53         static struct udevd_ctrl_msg ctrl_msg;
  54         struct sockaddr_un saddr;
  55         socklen_t addrlen;
  56         const char *env;
  57         const char *arg;
  58         const char *val;
  59         int *intval;
  60         int retval = 1;
  61
  62         env = getenv("UDEV_LOG");
  63         if (env)
  64                 udev_log = log_priority(env);
  65
  66         logging_init("udevcontrol");
  67         dbg("version %s", UDEV_VERSION);
  68
  69         if (argc < 2) {
  70                 fprintf(stderr, "missing command\n\n");
  71                 goto exit;
  72         }
  73         memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
  74         strcpy(ctrl_msg.magic, UDEVD_CTRL_MAGIC);
  75         arg = argv[1];
  76
  77         if (!strcmp(arg, "stop_exec_queue"))
  78                 ctrl_msg.type = UDEVD_CTRL_STOP_EXEC_QUEUE;
  79         else if (!strcmp(arg, "start_exec_queue"))
  80                 ctrl_msg.type = UDEVD_CTRL_START_EXEC_QUEUE;
  81         else if (!strcmp(arg, "reload_rules"))
  82                 ctrl_msg.type = UDEVD_CTRL_RELOAD_RULES;
  83         else if (!strncmp(arg, "log_priority=", strlen("log_priority="))) {
  84                 intval = (int *) ctrl_msg.buf;
  85                 val = &arg[strlen("log_priority=")];
  86                 ctrl_msg.type = UDEVD_CTRL_SET_LOG_LEVEL;
  87                 *intval = log_priority(val);
  88                 info("send log_priority=%i", *intval);
  89         } else if (!strncmp(arg, "max_childs=", strlen("max_childs="))) {
  90                 char *endp;
  91                 int count;
  92
  93                 intval = (int *) ctrl_msg.buf;
  94                 val = &arg[strlen("max_childs=")];
  95                 ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS;
  96                 count = strtoul(val, &endp, 0);
  97                 if (endp[0] != '\0' || count < 1) {
  98                         fprintf(stderr, "invalid number\n");
  99                         goto exit;
 100                 }
 101                 *intval = count;
 102                 info("send max_childs=%i", *intval);
 103         } else if (!strncmp(arg, "max_childs_running=", strlen("max_childs_running="))) {
 104                 char *endp;
 105                 int count;
 106
 107                 intval = (int *) ctrl_msg.buf;
 108                 val = &arg[strlen("max_childs_running=")];
 109                 ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS_RUNNING;
 110                 count = strtoul(val, &endp, 0);
 111                 if (endp[0] != '\0' || count < 1) {
 112                         fprintf(stderr, "invalid number\n");
 113                         goto exit;
 114                 }
 115                 *intval = count;
 116                 info("send max_childs_running=%i", *intval);
 117         } else if (!strncmp(arg, "env", strlen("env"))) {
 118                 val = argv[2];
 119                 if (val == NULL) {
 120                         fprintf(stderr, "missing key\n");
 121                         goto exit;
 122                 }
 123                 ctrl_msg.type = UDEVD_CTRL_ENV;
 124                 strlcpy(ctrl_msg.buf, val, sizeof(ctrl_msg.buf));
 125                 info("send env '%s'", val);
 126         } else if (strcmp(arg, "help") == 0  || strcmp(arg, "--help") == 0  || strcmp(arg, "-h") == 0) {
 127                 printf("Usage: udevcontrol COMMAND\n"
 128                         "  log_priority=<level>   set the udev log level for the daemon\n"
 129                         "  stop_exec_queue        keep udevd from executing events, queue only\n"
 130                         "  start_exec_queue       execute events, flush queue\n"
 131                         "  reload_rules           reloads the rules files\n"
 132                         "  env <var>=<value>      set a global environment variable\n"
 133                         "  max_childs=<N>         maximum number of childs\n"
 134                         "  max_childs_running=<N> maximum number of childs running at the same time\n"
 135                         "  help                   print this help text\n\n");
 136                 goto exit;
 137         } else {
 138                 fprintf(stderr, "unrecognized command '%s'\n", arg);
 139                 goto exit;
 140         }
 141
 142         if (getuid() != 0) {
 143                 fprintf(stderr, "root privileges required\n");
 144                 goto exit;
 145         }
 146
 147         sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 148         if (sock == -1) {
 149                 err("error getting socket: %s", strerror(errno));
 150                 goto exit;
 151         }
 152
 153         memset(&saddr, 0x00, sizeof(struct sockaddr_un));
 154         saddr.sun_family = AF_LOCAL;
 155         /* use abstract namespace for socket path */
 156         strcpy(&saddr.sun_path[1], UDEVD_CTRL_SOCK_PATH);
 157         addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
 158
 159         retval = sendto(sock, &ctrl_msg, sizeof(ctrl_msg), 0, (struct sockaddr *)&saddr, addrlen);
 160         if (retval == -1) {
 161                 err("error sending message: %s", strerror(errno));
 162                 retval = 1;
 163         } else {
 164                 dbg("sent message type=0x%02x, %u bytes sent", ctrl_msg.type, retval);
 165                 retval = 0;
 166         }
 167
 168         close(sock);
 169 exit:
 170         logging_close();
 171         return retval;
 172 }