main.c

   1 /*
   2  * rpcd - UBUS RPC server
   3  *
   4  *   Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   5  *   Copyright (C) 2013 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
  22 #include <libubox/blobmsg_json.h>
  23 #include <libubus.h>
  24 #include <signal.h>
  25 #include <sys/stat.h>
  26
  27 #include <rpcd/session.h>
  28 #include <rpcd/uci.h>
  29 #include <rpcd/plugin.h>
  30 #include <rpcd/exec.h>
  31
  32 static struct ubus_context *ctx;
  33 static bool respawn = false;
  34
  35 static void
  36 handle_signal(int sig)
  37 {
  38         rpc_session_freeze();
  39         uloop_cancelled = true;
  40         respawn = (sig == SIGHUP);
  41 }
  42
  43 static void
  44 exec_self(int argc, char **argv)
  45 {
  46         int i;
  47         const char *cmd = rpc_exec_lookup(argv[0]);
  48         char **args = calloc(argc + 1, sizeof(char *));
  49
  50         if (!cmd || !args)
  51                 return;
  52
  53         for (i = 0; i < argc; i++)
  54                 args[i] = argv[i];
  55
  56         setenv("RPC_HANGUP", "1", 1);
  57         execv(cmd, (char * const *)args);
  58 }
  59
  60 int main(int argc, char **argv)
  61 {
  62         struct stat s;
  63         const char *hangup;
  64         const char *ubus_socket = NULL;
  65         int ch;
  66
  67         while ((ch = getopt(argc, argv, "s:")) != -1) {
  68                 switch (ch) {
  69                 case 's':
  70                         ubus_socket = optarg;
  71                         break;
  72                 default:
  73                         break;
  74                 }
  75         }
  76
  77         if (stat("/var/run/rpcd", &s))
  78                 mkdir("/var/run/rpcd", 0700);
  79
  80         signal(SIGPIPE, SIG_IGN);
  81         signal(SIGHUP,  handle_signal);
  82         signal(SIGUSR1, handle_signal);
  83
  84         uloop_init();
  85
  86         ctx = ubus_connect(ubus_socket);
  87         if (!ctx) {
  88                 fprintf(stderr, "Failed to connect to ubus\n");
  89                 return -1;
  90         }
  91
  92         ubus_add_uloop(ctx);
  93
  94         rpc_session_api_init(ctx);
  95         rpc_uci_api_init(ctx);
  96         rpc_plugin_api_init(ctx);
  97
  98         hangup = getenv("RPC_HANGUP");
  99
 100         if (!hangup || strcmp(hangup, "1"))
 101                 rpc_uci_purge_savedirs();
 102         else
 103                 rpc_session_thaw();
 104
 105         uloop_run();
 106         ubus_free(ctx);
 107         uloop_done();
 108
 109         if (respawn)
 110                 exec_self(argc, argv);
 111
 112         return 0;
 113 }