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 int udevcontrol(int argc, char *argv[], char *envp[])
  38 {
  39         static struct udevd_ctrl_msg ctrl_msg;
  40         struct sockaddr_un saddr;
  41         socklen_t addrlen;
  42         const char *env;
  43         const char *arg;
  44         const char *val;
  45         int *intval;
  46         int retval = 1;
  47
  48         env = getenv("UDEV_LOG");
  49         if (env)
  50                 udev_log = log_priority(env);
  51
  52         logging_init("udevcontrol");
  53         dbg("version %s\n", UDEV_VERSION);
  54
  55         if (argc < 2) {
  56                 fprintf(stderr, "missing command\n\n");
  57                 goto exit;
  58         }
  59         memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
  60         strcpy(ctrl_msg.magic, UDEVD_CTRL_MAGIC);
  61         arg = argv[1];
  62
  63         /* allow instructions passed as options */
  64         if (strncmp(arg, "--", 2) == 0)
  65                 arg += 2;
  66
  67         if (!strcmp(arg, "stop_exec_queue"))
  68                 ctrl_msg.type = UDEVD_CTRL_STOP_EXEC_QUEUE;
  69         else if (!strcmp(arg, "start_exec_queue"))
  70                 ctrl_msg.type = UDEVD_CTRL_START_EXEC_QUEUE;
  71         else if (!strcmp(arg, "reload_rules"))
  72                 ctrl_msg.type = UDEVD_CTRL_RELOAD_RULES;
  73         else if (!strncmp(arg, "log_priority=", strlen("log_priority="))) {
  74                 intval = (int *) ctrl_msg.buf;
  75                 val = &arg[strlen("log_priority=")];
  76                 ctrl_msg.type = UDEVD_CTRL_SET_LOG_LEVEL;
  77                 *intval = log_priority(val);
  78                 info("send log_priority=%i\n", *intval);
  79         } else if (!strncmp(arg, "max_childs=", strlen("max_childs="))) {
  80                 char *endp;
  81                 int count;
  82
  83                 intval = (int *) ctrl_msg.buf;
  84                 val = &arg[strlen("max_childs=")];
  85                 ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS;
  86                 count = strtoul(val, &endp, 0);
  87                 if (endp[0] != '\0' || count < 1) {
  88                         fprintf(stderr, "invalid number\n");
  89                         goto exit;
  90                 }
  91                 *intval = count;
  92                 info("send max_childs=%i\n", *intval);
  93         } else if (!strncmp(arg, "max_childs_running=", strlen("max_childs_running="))) {
  94                 char *endp;
  95                 int count;
  96
  97                 intval = (int *) ctrl_msg.buf;
  98                 val = &arg[strlen("max_childs_running=")];
  99                 ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS_RUNNING;
 100                 count = strtoul(val, &endp, 0);
 101                 if (endp[0] != '\0' || count < 1) {
 102                         fprintf(stderr, "invalid number\n");
 103                         goto exit;
 104                 }
 105                 *intval = count;
 106                 info("send max_childs_running=%i\n", *intval);
 107         } else if (!strncmp(arg, "env", strlen("env"))) {
 108                 if (!strncmp(arg, "env=", strlen("env=")))
 109                         val = &arg[strlen("env=")];
 110                 else
 111                         val = argv[2];
 112                 if (val == NULL) {
 113                         fprintf(stderr, "missing key\n");
 114                         goto exit;
 115                 }
 116                 ctrl_msg.type = UDEVD_CTRL_ENV;
 117                 strlcpy(ctrl_msg.buf, val, sizeof(ctrl_msg.buf));
 118                 info("send env '%s'\n", val);
 119         } else if (strcmp(arg, "help") == 0  || strcmp(arg, "-h") == 0) {
 120                 printf("Usage: udevadm control COMMAND\n"
 121                         "  --log_priority=<level>   set the udev log level for the daemon\n"
 122                         "  --stop_exec_queue        keep udevd from executing events, queue only\n"
 123                         "  --start_exec_queue       execute events, flush queue\n"
 124                         "  --reload_rules           reloads the rules files\n"
 125                         "  --env=<KEY>=<value>      set a global environment variable\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         if (getuid() != 0) {
 136                 fprintf(stderr, "root privileges required\n");
 137                 goto exit;
 138         }
 139
 140         sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 141         if (sock == -1) {
 142                 err("error getting socket: %s\n", strerror(errno));
 143                 goto exit;
 144         }
 145
 146         memset(&saddr, 0x00, sizeof(struct sockaddr_un));
 147         saddr.sun_family = AF_LOCAL;
 148         /* use abstract namespace for socket path */
 149         strcpy(&saddr.sun_path[1], UDEVD_CTRL_SOCK_PATH);
 150         addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);
 151
 152         retval = sendto(sock, &ctrl_msg, sizeof(ctrl_msg), 0, (struct sockaddr *)&saddr, addrlen);
 153         if (retval == -1) {
 154                 err("error sending message: %s\n", strerror(errno));
 155                 retval = 1;
 156         } else {
 157                 dbg("sent message type=0x%02x, %u bytes sent\n", ctrl_msg.type, retval);
 158                 retval = 0;
 159         }
 160
 161         close(sock);
 162 exit:
 163         logging_close();
 164         return retval;
 165 }