main.c

   1 /*
   2  * rpcd - UBUS RPC server
   3  *
   4  *   Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   5  *   Copyright (C) 2013-2014 Jo-Philipp Wich <jow@openwrt.org>
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #include <unistd.h>
  21 #include <stdlib.h>
  22
  23 #include <libubox/blobmsg_json.h>
  24 #include <libubus.h>
  25 #include <signal.h>
  26 #include <sys/stat.h>
  27
  28 #include <rpcd/session.h>
  29 #include <rpcd/uci.h>
  30 #include <rpcd/plugin.h>
  31 #include <rpcd/exec.h>
  32
  33 static struct ubus_context *ctx;
  34 static bool respawn = false;
  35
  36 int rpc_exec_timeout = RPC_EXEC_DEFAULT_TIMEOUT;
  37
  38 static void
  39 handle_signal(int sig)
  40 {
  41         rpc_session_freeze();
  42         uloop_cancelled = true;
  43         respawn = (sig == SIGHUP);
  44 }
  45
  46 static void
  47 exec_self(int argc, char **argv)
  48 {
  49         int i;
  50         const char *cmd;
  51         char **args;
  52
  53         cmd = rpc_exec_lookup(argv[0]);
  54         if (!cmd)
  55                 return;
  56
  57         args = calloc(argc + 1, sizeof(char *));
  58         if (!args)
  59                 return;
  60
  61         for (i = 0; i < argc; i++)
  62                 args[i] = argv[i];
  63
  64         setenv("RPC_HANGUP", "1", 1);
  65         execv(cmd, (char * const *)args);
  66 }
  67
  68 int main(int argc, char **argv)
  69 {
  70         struct stat s;
  71         const char *hangup;
  72         const char *ubus_socket = NULL;
  73         int ch;
  74
  75         while ((ch = getopt(argc, argv, "s:t:")) != -1) {
  76                 switch (ch) {
  77                 case 's':
  78                         ubus_socket = optarg;
  79                         break;
  80
  81                 case 't':
  82                         rpc_exec_timeout = 1000 * strtol(optarg, NULL, 0);
  83                         break;
  84
  85                 default:
  86                         break;
  87                 }
  88         }
  89
  90         if (rpc_exec_timeout < 1000 || rpc_exec_timeout > 600000) {
  91                 fprintf(stderr, "Invalid execution timeout specified\n");
  92                 return -1;
  93         }
  94
  95         if (stat(RPC_UCI_DIR_PREFIX, &s))
  96                 mkdir(RPC_UCI_DIR_PREFIX, 0700);
  97
  98         umask(0077);
  99
 100         signal(SIGPIPE, SIG_IGN);
 101         signal(SIGHUP,  handle_signal);
 102         signal(SIGUSR1, handle_signal);
 103
 104         uloop_init();
 105
 106         ctx = ubus_connect(ubus_socket);
 107         if (!ctx) {
 108                 fprintf(stderr, "Failed to connect to ubus\n");
 109                 return -1;
 110         }
 111
 112         ubus_add_uloop(ctx);
 113
 114         rpc_session_api_init(ctx);
 115         rpc_uci_api_init(ctx);
 116         rpc_plugin_api_init(ctx);
 117
 118         hangup = getenv("RPC_HANGUP");
 119
 120         if (!hangup || strcmp(hangup, "1"))
 121                 rpc_uci_purge_savedirs();
 122         else
 123                 rpc_session_thaw();
 124
 125         uloop_run();
 126         ubus_free(ctx);
 127         uloop_done();
 128
 129         if (respawn)
 130                 exec_self(argc, argv);
 131
 132         return 0;
 133 }