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
  25 #include "stdinc.h"
  26 #include "client.h"
  27 #include "ircd.h"
  28 #include "match.h"
  29 #include "numeric.h"
  30 #include "s_conf.h"
  31 #include "s_newconf.h"
  32 #include "logger.h"
  33 #include "s_serv.h"
  34 #include "send.h"
  35 #include "msg.h"
  36 #include "parse.h"
  37 #include "hash.h"
  38 #include "modules.h"
  39 #include "sslproc.h"
  40
  41 static const char connect_desc[] =
  42         "Provides the CONNECT command to introduce servers to the network";
  43
  44 static void mo_connect(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  45 static void ms_connect(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  46
  47 struct Message connect_msgtab = {
  48         "CONNECT", 0, 0, 0, 0,
  49         {mg_unreg, mg_not_oper, {ms_connect, 4}, {ms_connect, 4}, mg_ignore, {mo_connect, 2}}
  50 };
  51
  52 mapi_clist_av1 connect_clist[] = { &connect_msgtab, NULL };
  53
  54 DECLARE_MODULE_AV2(connect, NULL, NULL, connect_clist, NULL, NULL, NULL, NULL, connect_desc);
  55
  56 /*
  57  * mo_connect - CONNECT command handler
  58  *
  59  * Added by Jto 11 Feb 1989
  60  *
  61  * m_connect
  62  *      parv[1] = servername
  63  *      parv[2] = port number
  64  *      parv[3] = remote server
  65  */
  66 static void
  67 mo_connect(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  68 {
  69         int port;
  70         int tmpport;
  71         struct server_conf *server_p;
  72         struct Client *target_p;
  73
  74         /* always privileged with handlers */
  75
  76         if(MyConnect(source_p) && !IsOperRemote(source_p) && parc > 3)
  77         {
  78                 sendto_one(source_p, form_str(ERR_NOPRIVS),
  79                            me.name, source_p->name, "remote");
  80                 return;
  81         }
  82
  83         if(hunt_server(client_p, source_p, ":%s CONNECT %s %s :%s", 3, parc, parv) != HUNTED_ISME)
  84                 return;
  85
  86         if((target_p = find_server(source_p, parv[1])))
  87         {
  88                 sendto_one_notice(source_p, ":Connect: Server %s already exists from %s.", parv[1],
  89                         target_p->from->name);
  90                 return;
  91         }
  92
  93         /*
  94          * try to find the name, then host, if both fail notify ops and bail
  95          */
  96         if((server_p = find_server_conf(parv[1])) == NULL)
  97         {
  98                 sendto_one_notice(source_p, ":Connect: Host %s not listed in ircd.conf", parv[1]);
  99                 return;
 100         }
 101
 102         if(ServerConfSSL(server_p) && (!ircd_ssl_ok || !get_ssld_count()))
 103         {
 104                 sendto_one_notice(source_p,
 105                                   ":Connect: Server %s is set to use SSL/TLS but SSL/TLS is not configured.",
 106                                   parv[1]);
 107                 return;
 108         }
 109
 110         /*
 111          * Get port number from user, if given. If not specified,
 112          * use the default form configuration structure. If missing
 113          * from there, then use the precompiled default.
 114          */
 115         port = 0;
 116         if(parc > 2 && !EmptyString(parv[2]))
 117                 port = atoi(parv[2]);
 118         if(port == 0 && server_p->port)
 119                 port = server_p->port;
 120         else if(port <= 0)
 121         {
 122                 sendto_one_notice(source_p, ":Connect: illegal port number");
 123                 return;
 124         }
 125
 126         /*
 127          * Notify all operators about remote connect requests
 128          */
 129
 130         ilog(L_SERVER, "CONNECT From %s : %s %s", source_p->name, parv[1], parc > 2 ? parv[2] : "");
 131
 132         tmpport = server_p->port;
 133         server_p->port = port;
 134
 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                         sendto_one_notice(source_p, ":*** Connecting to %s.%d",
 142                                 server_p->name, server_p->port);
 143         }
 144         else
 145         {
 146                 sendto_one_notice(source_p, ":*** Couldn't connect to %s.%d",
 147                         server_p->name, server_p->port);
 148         }
 149
 150         /*
 151          * client is either connecting with all the data it needs or has been
 152          * destroyed, so reset it back to the configured settings
 153          */
 154         server_p->port = tmpport;
 155 }
 156
 157 /*
 158  * ms_connect - CONNECT command handler
 159  *
 160  * Added by Jto 11 Feb 1989
 161  *
 162  * m_connect
 163  *      parv[1] = servername
 164  *      parv[2] = port number
 165  *      parv[3] = remote server
 166  */
 167 static void
 168 ms_connect(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 169 {
 170         int port;
 171         int tmpport;
 172         struct server_conf *server_p;
 173         struct Client *target_p;
 174
 175         if(hunt_server(client_p, source_p, ":%s CONNECT %s %s :%s", 3, parc, parv) != HUNTED_ISME)
 176                 return;
 177
 178         if((target_p = find_server(NULL, parv[1])))
 179         {
 180                 sendto_one_notice(source_p, ":Connect: Server %s already exists from %s.",
 181                                   parv[1], target_p->from->name);
 182                 return;
 183         }
 184
 185         /*
 186          * try to find the name, then host, if both fail notify ops and bail
 187          */
 188         if((server_p = find_server_conf(parv[1])) == NULL)
 189         {
 190                 sendto_one_notice(source_p, ":Connect: Host %s not listed in ircd.conf",
 191                                   parv[1]);
 192                 return;
 193         }
 194
 195         if(ServerConfSSL(server_p) && (!ircd_ssl_ok || !get_ssld_count()))
 196         {
 197                 sendto_one_notice(source_p,
 198                                   ":Connect: Server %s is set to use SSL/TLS but SSL/TLS is not configured.",
 199                                   parv[1]);
 200                 return;
 201         }
 202
 203         /*
 204          * Get port number from user, if given. If not specified,
 205          * use the default form configuration structure. If missing
 206          * from there, then use the precompiled default.
 207          */
 208         tmpport = server_p->port;
 209
 210         port = atoi(parv[2]);
 211
 212         /* if someone sends port 0, and we have a config port.. use it */
 213         if(port == 0 && server_p->port)
 214                 port = server_p->port;
 215         else if(port <= 0)
 216         {
 217                 sendto_one_notice(source_p, ":Connect: Illegal port number");
 218                 return;
 219         }
 220
 221         /*
 222          * Notify all operators about remote connect requests
 223          */
 224         sendto_wallops_flags(UMODE_WALLOP, &me,
 225                              "Remote CONNECT %s %d from %s",
 226                              parv[1], port, source_p->name);
 227         sendto_server(NULL, NULL, CAP_TS6, NOCAPS,
 228                       ":%s WALLOPS :Remote CONNECT %s %d from %s",
 229                       me.id, parv[1], port, source_p->name);
 230
 231         ilog(L_SERVER, "CONNECT From %s : %s %d", source_p->name, parv[1], port);
 232
 233         server_p->port = port;
 234         /*
 235          * at this point we should be calling connect_server with a valid
 236          * C:line and a valid port in the C:line
 237          */
 238         if(serv_connect(server_p, source_p))
 239                 sendto_one_notice(source_p, ":*** Connecting to %s.%d",
 240                                   server_p->name, server_p->port);
 241         else
 242                 sendto_one_notice(source_p, ":*** Couldn't connect to %s.%d",
 243                                   server_p->name, server_p->port);
 244         /*
 245          * client is either connecting with all the data it needs or has been
 246          * destroyed
 247          */
 248         server_p->port = tmpport;
 249 }