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Sources/rpcd/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 }
134 

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