git.meshlink.io Git - meshlink/blob - src/control.c

   1 /*
   2     control.c -- Control socket handling.
   3     Copyright (C) 2013 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 "meta.h"
  28 #include "names.h"
  29 #include "net.h"
  30 #include "netutl.h"
  31 #include "protocol.h"
  32 #include "route.h"
  33 #include "utils.h"
  34 #include "xalloc.h"
  35
  36 char controlcookie[65];
  37
  38 static bool control_return(connection_t *c, int type, int error) {
  39         return send_request(c, "%d %d %d", CONTROL, type, error);
  40 }
  41
  42 static bool control_ok(connection_t *c, int type) {
  43         return control_return(c, type, 0);
  44 }
  45
  46 bool control_h(connection_t *c, const char *request) {
  47         int type;
  48
  49         if(!c->status.control || c->allow_request != CONTROL) {
  50                 logger(DEBUG_ALWAYS, LOG_ERR, "Unauthorized control request from %s (%s)", c->name, c->hostname);
  51                 return false;
  52         }
  53
  54         if(sscanf(request, "%*d %d", &type) != 1) {
  55                 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CONTROL", c->name, c->hostname);
  56                 return false;
  57         }
  58
  59         switch (type) {
  60                 case REQ_STOP:
  61                         event_exit();
  62                         return control_ok(c, REQ_STOP);
  63
  64                 case REQ_DUMP_NODES:
  65                         return dump_nodes(c);
  66
  67                 case REQ_DUMP_EDGES:
  68                         return dump_edges(c);
  69
  70                 case REQ_DUMP_SUBNETS:
  71                         return dump_subnets(c);
  72
  73                 case REQ_DUMP_CONNECTIONS:
  74                         return dump_connections(c);
  75
  76                 case REQ_PURGE:
  77                         purge();
  78                         return control_ok(c, REQ_PURGE);
  79
  80                 case REQ_SET_DEBUG: {
  81                         int new_level;
  82                         if(sscanf(request, "%*d %*d %d", &new_level) != 1)
  83                                 return false;
  84                         send_request(c, "%d %d %d", CONTROL, REQ_SET_DEBUG, debug_level);
  85                         if(new_level >= 0)
  86                                 debug_level = new_level;
  87                         return true;
  88                 }
  89
  90                 case REQ_RETRY:
  91                         retry();
  92                         return control_ok(c, REQ_RETRY);
  93
  94                 case REQ_RELOAD:
  95                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got '%s' command", "reload");
  96                         int result = reload_configuration();
  97                         return control_return(c, REQ_RELOAD, result);
  98
  99                 case REQ_DISCONNECT: {
 100                         char name[MAX_STRING_SIZE];
 101                         bool found = false;
 102
 103                         if(sscanf(request, "%*d %*d " MAX_STRING, name) != 1)
 104                                 return control_return(c, REQ_DISCONNECT, -1);
 105
 106                         for list_each(connection_t, other, connection_list) {
 107                                 if(strcmp(other->name, name))
 108                                         continue;
 109                                 terminate_connection(other, other->status.active);
 110                                 found = true;
 111                         }
 112
 113                         return control_return(c, REQ_DISCONNECT, found ? 0 : -2);
 114                 }
 115
 116                 case REQ_DUMP_TRAFFIC:
 117                         return dump_traffic(c);
 118
 119                 case REQ_PCAP:
 120                         sscanf(request, "%*d %*d %d", &c->outmaclength);
 121                         c->status.pcap = true;
 122                         pcap = true;
 123                         return true;
 124
 125                 case REQ_LOG:
 126                         sscanf(request, "%*d %*d %d", &c->outcompression);
 127                         c->status.log = true;
 128                         logcontrol = true;
 129                         return true;
 130
 131                 default:
 132                         return send_request(c, "%d %d", CONTROL, REQ_INVALID);
 133         }
 134 }
 135
 136 bool init_control(void) {
 137         randomize(controlcookie, sizeof controlcookie / 2);
 138         bin2hex(controlcookie, controlcookie, sizeof controlcookie / 2);
 139
 140         mode_t mask = umask(0);
 141         umask(mask | 077);
 142         FILE *f = fopen(pidfilename, "w");
 143         umask(mask);
 144
 145         if(!f) {
 146                 logger(DEBUG_ALWAYS, LOG_ERR, "Cannot write control socket cookie file %s: %s", pidfilename, strerror(errno));
 147                 return false;
 148         }
 149
 150         // Get the address and port of the first listening socket
 151
 152         char *localhost = NULL;
 153         sockaddr_t sa;
 154         socklen_t len = sizeof sa;
 155
 156         // Make sure we have a valid address, and map 0.0.0.0 and :: to 127.0.0.1 and ::1.
 157
 158         if(getsockname(listen_socket[0].tcp.fd, (struct sockaddr *)&sa, &len)) {
 159                 xasprintf(&localhost, "127.0.0.1 port %s", myport);
 160         } else {
 161                 if(sa.sa.sa_family == AF_INET) {
 162                         if(sa.in.sin_addr.s_addr == 0)
 163                                 sa.in.sin_addr.s_addr = htonl(0x7f000001);
 164                 } else if(sa.sa.sa_family == AF_INET6) {
 165                         static const uint8_t zero[16] = {0};
 166                         if(!memcmp(sa.in6.sin6_addr.s6_addr, zero, sizeof zero))
 167                                 sa.in6.sin6_addr.s6_addr[15] = 1;
 168                 }
 169
 170                 localhost = sockaddr2hostname(&sa);
 171         }
 172
 173         fprintf(f, "%d %s %s\n", (int)getpid(), controlcookie, localhost);
 174
 175         free(localhost);
 176         fclose(f);
 177
 178         return true;
 179 }
 180
 181 void exit_control(void) {
 182         unlink(pidfilename);
 183 }