modules/m_connect.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  m_connect.c: Connects to a remote IRC server.
   4  *
   5  *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
   6  *  Copyright (C) 1996-2002 Hybrid Development Team
   7  *  Copyright (C) 2002-2005 ircd-ratbox development team
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  22  *  USA
  23  *
  24  *  $Id: m_connect.c 3161 2007-01-25 07:23:01Z nenolod $
  25  */
  26
  27 #include "stdinc.h"
  28 #include "client.h"
  29 #include "ircd.h"
  30 #include "match.h"
  31 #include "numeric.h"
  32 #include "s_conf.h"
  33 #include "s_newconf.h"
  34 #include "logger.h"
  35 #include "s_serv.h"
  36 #include "send.h"
  37 #include "msg.h"
  38 #include "parse.h"
  39 #include "hash.h"
  40 #include "modules.h"
  41 #include "sslproc.h"
  42
  43 static int mo_connect(struct Client *, struct Client *, int, const char **);
  44 static int ms_connect(struct Client *, struct Client *, int, const char **);
  45
  46 struct Message connect_msgtab = {
  47         "CONNECT", 0, 0, 0, MFLG_SLOW,
  48         {mg_unreg, mg_not_oper, {ms_connect, 4}, {ms_connect, 4}, mg_ignore, {mo_connect, 2}}
  49 };
  50
  51 mapi_clist_av1 connect_clist[] = { &connect_msgtab, NULL };
  52 DECLARE_MODULE_AV1(connect, NULL, NULL, connect_clist, NULL, NULL, "$Revision: 3161 $");
  53
  54 /*
  55  * mo_connect - CONNECT command handler
  56  *
  57  * Added by Jto 11 Feb 1989
  58  *
  59  * m_connect
  60  *      parv[0] = sender prefix
  61  *      parv[1] = servername
  62  *      parv[2] = port number
  63  *      parv[3] = remote server
  64  */
  65 static int
  66 mo_connect(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  67 {
  68         int port;
  69         int tmpport;
  70         struct server_conf *server_p;
  71         struct Client *target_p;
  72
  73         /* always privileged with handlers */
  74
  75         if(MyConnect(source_p) && !IsOperRemote(source_p) && parc > 3)
  76         {
  77                 sendto_one(source_p, form_str(ERR_NOPRIVS),
  78                            me.name, source_p->name, "remote");
  79                 return 0;
  80         }
  81
  82         if(hunt_server(client_p, source_p, ":%s CONNECT %s %s :%s", 3, parc, parv) != HUNTED_ISME)
  83                 return 0;
  84
  85         if((target_p = find_server(source_p, parv[1])))
  86         {
  87                 sendto_one_notice(source_p, ":Connect: Server %s already exists from %s.", parv[1],
  88                         target_p->from->name);
  89                 return 0;
  90         }
  91
  92         /*
  93          * try to find the name, then host, if both fail notify ops and bail
  94          */
  95         if((server_p = find_server_conf(parv[1])) == NULL)
  96         {
  97                 sendto_one_notice(source_p, ":Connect: Host %s not listed in ircd.conf", parv[1]);
  98                 return 0;
  99         }
 100
 101         if(ServerConfSSL(server_p) && (!ssl_ok || !get_ssld_count()))
 102         {
 103                 sendto_one_notice(source_p,
 104                                   ":Connect: Server %s is set to use SSL/TLS but SSL/TLS is not configured.",
 105                                   parv[1]);
 106                 return 0;
 107         }
 108
 109         /*
 110          * Get port number from user, if given. If not specified,
 111          * use the default form configuration structure. If missing
 112          * from there, then use the precompiled default.
 113          */
 114         tmpport = port = server_p->port;
 115         if(parc > 2 && !EmptyString(parv[2]))
 116         {
 117                 if((port = atoi(parv[2])) <= 0)
 118                 {
 119                         sendto_one_notice(source_p, ":Connect: Illegal port number");
 120                         return 0;
 121                 }
 122         }
 123         else if(port <= 0 && (port = PORTNUM) <= 0)
 124         {
 125                 sendto_one_notice(source_p, ":Connect: missing port number");
 126                 return 0;
 127         }
 128         /*
 129          * Notify all operators about remote connect requests
 130          */
 131
 132         ilog(L_SERVER, "CONNECT From %s : %s %s", parv[0], parv[1], parc > 2 ? parv[2] : "");
 133
 134         server_p->port = port;
 135         /*
 136          * at this point we should be calling connect_server with a valid
 137          * C:line and a valid port in the C:line
 138          */
 139         if(serv_connect(server_p, source_p))
 140         {
 141 #ifndef HIDE_SERVERS_IPS
 142                         sendto_one_notice(source_p, ":*** Connecting to %s[%s].%d",
 143                                 server_p->host, server_p->name, server_p->port);
 144 #else
 145                         sendto_one_notice(source_p, ":*** Connecting to %s.%d",
 146                                 server_p->name, server_p->port);
 147 #endif
 148
 149         }
 150         else
 151         {
 152                 sendto_one_notice(source_p, ":*** Couldn't connect to %s.%d",
 153                         server_p->name, server_p->port);
 154         }
 155
 156         /*
 157          * client is either connecting with all the data it needs or has been
 158          * destroyed
 159          */
 160         server_p->port = tmpport;
 161         return 0;
 162 }
 163
 164 /*
 165  * ms_connect - CONNECT command handler
 166  *
 167  * Added by Jto 11 Feb 1989
 168  *
 169  * m_connect
 170  *      parv[0] = sender prefix
 171  *      parv[1] = servername
 172  *      parv[2] = port number
 173  *      parv[3] = remote server
 174  */
 175 static int
 176 ms_connect(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 177 {
 178         int port;
 179         int tmpport;
 180         struct server_conf *server_p;
 181         struct Client *target_p;
 182
 183         if(hunt_server(client_p, source_p, ":%s CONNECT %s %s :%s", 3, parc, parv) != HUNTED_ISME)
 184                 return 0;
 185
 186         if((target_p = find_server(NULL, parv[1])))
 187         {
 188                 sendto_one_notice(source_p, ":Connect: Server %s already exists from %s.",
 189                                   parv[1], target_p->from->name);
 190                 return 0;
 191         }
 192
 193         /*
 194          * try to find the name, then host, if both fail notify ops and bail
 195          */
 196         if((server_p = find_server_conf(parv[1])) == NULL)
 197         {
 198                 sendto_one_notice(source_p, ":Connect: Host %s not listed in ircd.conf",
 199                                   parv[1]);
 200                 return 0;
 201         }
 202
 203         if(ServerConfSSL(server_p) && (!ssl_ok || !get_ssld_count()))
 204         {
 205                 sendto_one_notice(source_p,
 206                                   ":Connect: Server %s is set to use SSL/TLS but SSL/TLS is not configured.",
 207                                   parv[1]);
 208                 return 0;
 209         }
 210
 211         /*
 212          * Get port number from user, if given. If not specified,
 213          * use the default form configuration structure. If missing
 214          * from there, then use the precompiled default.
 215          */
 216         tmpport = server_p->port;
 217
 218         port = atoi(parv[2]);
 219
 220         /* if someone sends port 0, and we have a config port.. use it */
 221         if(port == 0 && server_p->port)
 222                 port = server_p->port;
 223         else if(port <= 0)
 224         {
 225                 sendto_one_notice(source_p, ":Connect: Illegal port number");
 226                 return 0;
 227         }
 228
 229         /*
 230          * Notify all operators about remote connect requests
 231          */
 232         sendto_wallops_flags(UMODE_WALLOP, &me,
 233                              "Remote CONNECT %s %d from %s",
 234                              parv[1], port, source_p->name);
 235         sendto_server(NULL, NULL, CAP_TS6, NOCAPS,
 236                       ":%s WALLOPS :Remote CONNECT %s %d from %s",
 237                       me.id, parv[1], port, source_p->name);
 238         sendto_server(NULL, NULL, NOCAPS, CAP_TS6,
 239                       ":%s WALLOPS :Remote CONNECT %s %d from %s",
 240                       me.name, parv[1], port, source_p->name);
 241
 242         ilog(L_SERVER, "CONNECT From %s : %s %d", source_p->name, parv[1], port);
 243
 244         server_p->port = port;
 245         /*
 246          * at this point we should be calling connect_server with a valid
 247          * C:line and a valid port in the C:line
 248          */
 249         if(serv_connect(server_p, source_p))
 250                 sendto_one_notice(source_p, ":*** Connecting to %s.%d",
 251                                   server_p->name, server_p->port);
 252         else
 253                 sendto_one_notice(source_p, ":*** Couldn't connect to %s.%d",
 254                                   server_p->name, server_p->port);
 255         /*
 256          * client is either connecting with all the data it needs or has been
 257          * destroyed
 258          */
 259         server_p->port = tmpport;
 260         return 0;
 261 }