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 int mo_connect(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  42 static int ms_connect(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  43
  44 struct Message connect_msgtab = {
  45         "CONNECT", 0, 0, 0, 0,
  46         {mg_unreg, mg_not_oper, {ms_connect, 4}, {ms_connect, 4}, mg_ignore, {mo_connect, 2}}
  47 };
  48
  49 mapi_clist_av1 connect_clist[] = { &connect_msgtab, NULL };
  50 DECLARE_MODULE_AV2(connect, NULL, NULL, connect_clist, NULL, NULL, NULL, NULL, NULL);
  51
  52 /*
  53  * mo_connect - CONNECT command handler
  54  *
  55  * Added by Jto 11 Feb 1989
  56  *
  57  * m_connect
  58  *      parv[1] = servername
  59  *      parv[2] = port number
  60  *      parv[3] = remote server
  61  */
  62 static int
  63 mo_connect(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  64 {
  65         int port;
  66         int tmpport;
  67         struct server_conf *server_p;
  68         struct Client *target_p;
  69
  70         /* always privileged with handlers */
  71
  72         if(MyConnect(source_p) && !IsOperRemote(source_p) && parc > 3)
  73         {
  74                 sendto_one(source_p, form_str(ERR_NOPRIVS),
  75                            me.name, source_p->name, "remote");
  76                 return 0;
  77         }
  78
  79         if(hunt_server(client_p, source_p, ":%s CONNECT %s %s :%s", 3, parc, parv) != HUNTED_ISME)
  80                 return 0;
  81
  82         if((target_p = find_server(source_p, parv[1])))
  83         {
  84                 sendto_one_notice(source_p, ":Connect: Server %s already exists from %s.", parv[1],
  85                         target_p->from->name);
  86                 return 0;
  87         }
  88
  89         /*
  90          * try to find the name, then host, if both fail notify ops and bail
  91          */
  92         if((server_p = find_server_conf(parv[1])) == NULL)
  93         {
  94                 sendto_one_notice(source_p, ":Connect: Host %s not listed in ircd.conf", parv[1]);
  95                 return 0;
  96         }
  97
  98         if(ServerConfSSL(server_p) && (!ssl_ok || !get_ssld_count()))
  99         {
 100                 sendto_one_notice(source_p,
 101                                   ":Connect: Server %s is set to use SSL/TLS but SSL/TLS is not configured.",
 102                                   parv[1]);
 103                 return 0;
 104         }
 105
 106         /*
 107          * Get port number from user, if given. If not specified,
 108          * use the default form configuration structure. If missing
 109          * from there, then use the precompiled default.
 110          */
 111         port = 0;
 112         if(parc > 2 && !EmptyString(parv[2]))
 113                 port = atoi(parv[2]);
 114         if(port == 0 && server_p->port)
 115                 port = server_p->port;
 116         else if(port <= 0)
 117         {
 118                 sendto_one_notice(source_p, ":Connect: illegal port number");
 119                 return 0;
 120         }
 121
 122         /*
 123          * Notify all operators about remote connect requests
 124          */
 125
 126         ilog(L_SERVER, "CONNECT From %s : %s %s", source_p->name, parv[1], parc > 2 ? parv[2] : "");
 127
 128         tmpport = server_p->port;
 129         server_p->port = port;
 130
 131         /*
 132          * at this point we should be calling connect_server with a valid
 133          * C:line and a valid port in the C:line
 134          */
 135         if(serv_connect(server_p, source_p))
 136         {
 137                         sendto_one_notice(source_p, ":*** Connecting to %s.%d",
 138                                 server_p->name, server_p->port);
 139         }
 140         else
 141         {
 142                 sendto_one_notice(source_p, ":*** Couldn't connect to %s.%d",
 143                         server_p->name, server_p->port);
 144         }
 145
 146         /*
 147          * client is either connecting with all the data it needs or has been
 148          * destroyed, so reset it back to the configured settings
 149          */
 150         server_p->port = tmpport;
 151
 152         return 0;
 153 }
 154
 155 /*
 156  * ms_connect - CONNECT command handler
 157  *
 158  * Added by Jto 11 Feb 1989
 159  *
 160  * m_connect
 161  *      parv[1] = servername
 162  *      parv[2] = port number
 163  *      parv[3] = remote server
 164  */
 165 static int
 166 ms_connect(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
 167 {
 168         int port;
 169         int tmpport;
 170         struct server_conf *server_p;
 171         struct Client *target_p;
 172
 173         if(hunt_server(client_p, source_p, ":%s CONNECT %s %s :%s", 3, parc, parv) != HUNTED_ISME)
 174                 return 0;
 175
 176         if((target_p = find_server(NULL, parv[1])))
 177         {
 178                 sendto_one_notice(source_p, ":Connect: Server %s already exists from %s.",
 179                                   parv[1], target_p->from->name);
 180                 return 0;
 181         }
 182
 183         /*
 184          * try to find the name, then host, if both fail notify ops and bail
 185          */
 186         if((server_p = find_server_conf(parv[1])) == NULL)
 187         {
 188                 sendto_one_notice(source_p, ":Connect: Host %s not listed in ircd.conf",
 189                                   parv[1]);
 190                 return 0;
 191         }
 192
 193         if(ServerConfSSL(server_p) && (!ssl_ok || !get_ssld_count()))
 194         {
 195                 sendto_one_notice(source_p,
 196                                   ":Connect: Server %s is set to use SSL/TLS but SSL/TLS is not configured.",
 197                                   parv[1]);
 198                 return 0;
 199         }
 200
 201         /*
 202          * Get port number from user, if given. If not specified,
 203          * use the default form configuration structure. If missing
 204          * from there, then use the precompiled default.
 205          */
 206         tmpport = server_p->port;
 207
 208         port = atoi(parv[2]);
 209
 210         /* if someone sends port 0, and we have a config port.. use it */
 211         if(port == 0 && server_p->port)
 212                 port = server_p->port;
 213         else if(port <= 0)
 214         {
 215                 sendto_one_notice(source_p, ":Connect: Illegal port number");
 216                 return 0;
 217         }
 218
 219         /*
 220          * Notify all operators about remote connect requests
 221          */
 222         sendto_wallops_flags(UMODE_WALLOP, &me,
 223                              "Remote CONNECT %s %d from %s",
 224                              parv[1], port, source_p->name);
 225         sendto_server(NULL, NULL, CAP_TS6, NOCAPS,
 226                       ":%s WALLOPS :Remote CONNECT %s %d from %s",
 227                       me.id, parv[1], port, source_p->name);
 228
 229         ilog(L_SERVER, "CONNECT From %s : %s %d", source_p->name, parv[1], port);
 230
 231         server_p->port = port;
 232         /*
 233          * at this point we should be calling connect_server with a valid
 234          * C:line and a valid port in the C:line
 235          */
 236         if(serv_connect(server_p, source_p))
 237                 sendto_one_notice(source_p, ":*** Connecting to %s.%d",
 238                                   server_p->name, server_p->port);
 239         else
 240                 sendto_one_notice(source_p, ":*** Couldn't connect to %s.%d",
 241                                   server_p->name, server_p->port);
 242         /*
 243          * client is either connecting with all the data it needs or has been
 244          * destroyed
 245          */
 246         server_p->port = tmpport;
 247         return 0;
 248 }