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