ubus.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <sys/resource.h>
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <signal.h>
  19
  20 #include "procd.h"
  21
  22 char *ubus_socket = NULL;
  23 static struct ubus_context *ctx;
  24 static struct uloop_process ubus_proc;
  25 static bool ubus_connected = false;
  26 static int reconnect = 1;
  27
  28 static void procd_ubus_connection_lost(struct ubus_context *old_ctx);
  29
  30 static void ubus_proc_cb(struct uloop_process *proc, int ret)
  31 {
  32         /* nothing to do here */
  33 }
  34
  35 static void procd_restart_ubus(void)
  36 {
  37         char *argv[] = { "ubusd", NULL, ubus_socket, NULL };
  38
  39         if (ubus_proc.pending) {
  40                 ERROR("Killing existing ubus instance, pid=%d\n", (int) ubus_proc.pid);
  41                 kill(ubus_proc.pid, SIGKILL);
  42                 uloop_process_delete(&ubus_proc);
  43         }
  44
  45         if (ubus_socket)
  46                 argv[1] = "-s";
  47
  48         ubus_proc.pid = fork();
  49         if (!ubus_proc.pid) {
  50                 setpriority(PRIO_PROCESS, 0, -20);
  51                 execvp(argv[0], argv);
  52                 exit(-1);
  53         }
  54
  55         if (ubus_proc.pid <= 0) {
  56                 ERROR("Failed to start new ubus instance\n");
  57                 return;
  58         }
  59
  60         DEBUG(1, "Launched new ubus instance, pid=%d\n", (int) ubus_proc.pid);
  61         uloop_process_add(&ubus_proc);
  62 }
  63
  64 static void procd_ubus_try_connect(void)
  65 {
  66         if (ctx) {
  67                 ubus_connected = !ubus_reconnect(ctx, ubus_socket);
  68                 return;
  69         }
  70
  71         ctx = ubus_connect(ubus_socket);
  72         if (!ctx) {
  73                 DEBUG(2, "Connection to ubus failed\n");
  74                 return;
  75         }
  76
  77         ctx->connection_lost = procd_ubus_connection_lost;
  78         ubus_connected = true;
  79         ubus_init_service(ctx);
  80         ubus_init_system(ctx);
  81         if (getpid() == 1)
  82                 ubus_init_log(ctx);
  83 }
  84
  85 static void procd_ubus_connection_lost(struct ubus_context *old_ctx)
  86 {
  87         if (!reconnect)
  88                 return;
  89
  90         procd_ubus_try_connect();
  91         while (!ubus_connected) {
  92                 procd_restart_ubus();
  93                 sleep(1);
  94                 procd_ubus_try_connect();
  95         }
  96
  97         DEBUG(1, "Connected to ubus, id=%08x\n", ctx->local_id);
  98         ubus_add_uloop(ctx);
  99 }
 100
 101 void procd_connect_ubus(void)
 102 {
 103         ubus_proc.cb = ubus_proc_cb;
 104         procd_ubus_connection_lost(NULL);
 105 }
 106
 107 void procd_reconnect_ubus(int _reconnect)
 108 {
 109         reconnect = _reconnect;
 110 }
 111