tinc-vpn.org Git - tinc/blob - src/control.c

   1 /*
   2     control.c -- Control socket handling.
   3     Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "system.h"
  21 #include "crypto.h"
  22 #include "conf.h"
  23 #include "control.h"
  24 #include "control_common.h"
  25 #include "graph.h"
  26 #include "logger.h"
  27 #include "protocol.h"
  28 #include "utils.h"
  29 #include "xalloc.h"
  30
  31 static int control_socket = -1;
  32 static struct event control_event;
  33 static splay_tree_t *control_socket_tree;
  34 char controlcookie[65];
  35 extern char *controlcookiename;
  36
  37 static bool control_return(connection_t *c, int type, int error) {
  38         return send_request(c, "%d %d %d", CONTROL, type, error);
  39 }
  40
  41 static bool control_ok(connection_t *c, int type) {
  42         return control_return(c, type, 0);
  43 }
  44
  45 bool control_h(connection_t *c, char *request) {
  46         int type;
  47
  48         if(!c->status.control || c->allow_request != CONTROL) {
  49                 logger(LOG_ERR, "Unauthorized control request from %s (%s)", c->name, c->hostname);
  50                 return false;
  51         }
  52
  53         if(sscanf(request, "%*d %d", &type) != 1) {
  54                 logger(LOG_ERR, "Got bad %s from %s (%s)", "CONTROL", c->name, c->hostname);
  55                 return false;
  56         }
  57
  58         switch (type) {
  59                 case REQ_STOP:
  60                         event_loopexit(NULL);
  61                         return control_ok(c, REQ_STOP);
  62
  63                 case REQ_DUMP_NODES:
  64                         return dump_nodes(c);
  65
  66                 case REQ_DUMP_EDGES:
  67                         return dump_edges(c);
  68
  69                 case REQ_DUMP_SUBNETS:
  70                         return dump_subnets(c);
  71
  72                 case REQ_DUMP_CONNECTIONS:
  73                         return dump_connections(c);
  74
  75                 case REQ_PURGE:
  76                         purge();
  77                         return control_ok(c, REQ_PURGE);
  78
  79                 case REQ_SET_DEBUG: {
  80                         int new_level;
  81                         if(sscanf(request, "%*d %*d %d", &new_level) != 1)
  82                                 return false;
  83                         send_request(c, "%d %d %d", CONTROL, REQ_SET_DEBUG, debug_level);
  84                         if(new_level >= 0)
  85                                 debug_level = new_level;
  86                         return true;
  87                 }
  88
  89                 case REQ_RETRY:
  90                         retry();
  91                         return control_ok(c, REQ_RETRY);
  92
  93                 case REQ_RELOAD:
  94                         logger(LOG_NOTICE, "Got '%s' command", "reload");
  95                         int result = reload_configuration();
  96                         return control_return(c, REQ_RELOAD, result);
  97
  98                 default:
  99                         return send_request(c, "%d %d", CONTROL, REQ_INVALID);
 100         }
 101 }
 102
 103 bool init_control() {
 104         randomize(controlcookie, sizeof controlcookie / 2);
 105         bin2hex(controlcookie, controlcookie, sizeof controlcookie / 2);
 106         controlcookie[sizeof controlcookie - 1] = 0;
 107
 108         FILE *f = fopen(controlcookiename, "w");
 109         if(!f) {
 110                 logger(LOG_ERR, "Cannot write control socket cookie file %s: %s", controlcookiename, strerror(errno));
 111                 return false;
 112         }
 113
 114 #ifdef HAVE_FCHMOD
 115         fchmod(f, 0600);
 116 #else
 117         chmod(controlcookiename, 0600);
 118 #endif
 119
 120         fprintf(f, "%s %s %d\n", controlcookie, myport, getpid());
 121         fclose(f);
 122
 123         return true;
 124 }
 125
 126 void exit_control() {
 127         unlink(controlcookiename);
 128 }