ircd/s_serv.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/s_serv.c (formerly ircd/s_msg.c)
   3  * Copyright (C) 1990 Jarkko Oikarinen and
   4  *                    University of Oulu, Computing Center
   5  *
   6  * See file AUTHORS in IRC package for additional names of
   7  * the programmers.
   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 1, or (at your option)
  12  * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23 /** @file
  24  * @brief Miscellaneous server support functions.
  25  * @version $Id: s_serv.c,v 1.40 2005/06/28 00:42:06 entrope Exp $
  26  */
  27 #include "config.h"
  28
  29 #include "s_serv.h"
  30 #include "IPcheck.h"
  31 #include "channel.h"
  32 #include "client.h"
  33 #include "gline.h"
  34 #include "hash.h"
  35 #include "ircd.h"
  36 #include "ircd_alloc.h"
  37 #include "ircd_log.h"
  38 #include "ircd_reply.h"
  39 #include "ircd_string.h"
  40 #include "ircd_snprintf.h"
  41 #include "ircd_crypt.h"
  42 #include "jupe.h"
  43 #include "list.h"
  44 #include "match.h"
  45 #include "msg.h"
  46 #include "msgq.h"
  47 #include "numeric.h"
  48 #include "numnicks.h"
  49 #include "parse.h"
  50 #include "querycmds.h"
  51 #include "s_bsd.h"
  52 #include "s_conf.h"
  53 #include "s_debug.h"
  54 #include "s_misc.h"
  55 #include "s_user.h"
  56 #include "send.h"
  57 #include "struct.h"
  58 #include "sys.h"
  59 #include "userload.h"
  60
  61 /* #include <assert.h> -- Now using assert in ircd_log.h */
  62 #include <stdlib.h>
  63 #include <string.h>
  64
  65 /** Maximum connection count since last restart. */
  66 unsigned int max_connection_count = 0;
  67 /** Maximum (local) client count since last restart. */
  68 unsigned int max_client_count = 0;
  69
  70 /** Squit a new (pre-burst) server.
  71  * @param cptr Local client that tried to introduce the server.
  72  * @param sptr Server to disconnect.
  73  * @param host Name of server being disconnected.
  74  * @param timestamp Link time of server being disconnected.
  75  * @param pattern Format string for squit message.
  76  * @return CPTR_KILLED if cptr == sptr, else 0.
  77  */
  78 int exit_new_server(struct Client *cptr, struct Client *sptr, const char *host,
  79                     time_t timestamp, const char *pattern, ...)
  80 {
  81   struct VarData vd;
  82   int retval = 0;
  83
  84   vd.vd_format = pattern;
  85   va_start(vd.vd_args, pattern);
  86
  87   if (!IsServer(sptr))
  88     retval = vexit_client_msg(cptr, cptr, &me, pattern, vd.vd_args);
  89   else
  90     sendcmdto_one(&me, CMD_SQUIT, cptr, "%s %Tu :%v", host, timestamp, &vd);
  91
  92   va_end(vd.vd_args);
  93
  94   return retval;
  95 }
  96
  97 /** Indicate whether \a a is between \a b and #me (that is, \a b would
  98  * be killed if \a a squits).
  99  * @param a A server that may be between us and \a b.
 100  * @param b A client that may be on the far side of \a a.
 101  * @return Non-zero if \a a is between \a b and #me.
 102  */
 103 int a_kills_b_too(struct Client *a, struct Client *b)
 104 {
 105   for (; b != a && b != &me; b = cli_serv(b)->up);
 106   return (a == b ? 1 : 0);
 107 }
 108
 109 /** Handle a connection that has sent a valid PASS and SERVER.
 110  * @param cptr New peer server.
 111  * @param aconf Connect block for \a cptr.
 112  * @return Zero.
 113  */
 114 int server_estab(struct Client *cptr, struct ConfItem *aconf)
 115 {
 116   struct Client* acptr = 0;
 117   const char*    inpath;
 118   int            i;
 119
 120   assert(0 != cptr);
 121   assert(0 != cli_local(cptr));
 122
 123   inpath = cli_name(cptr);
 124
 125   if (IsUnknown(cptr)) {
 126     if (aconf->passwd[0])
 127       sendrawto_one(cptr, MSG_PASS " :%s", aconf->passwd);
 128     /*
 129      *  Pass my info to the new server
 130      */
 131     sendrawto_one(cptr, MSG_SERVER " %s 1 %Tu %Tu J%s %s%s +%s6 :%s",
 132                   cli_name(&me), cli_serv(&me)->timestamp,
 133                   cli_serv(cptr)->timestamp, MAJOR_PROTOCOL, NumServCap(&me),
 134                   feature_bool(FEAT_HUB) ? "h" : "",
 135                   *(cli_info(&me)) ? cli_info(&me) : "IRCers United");
 136   }
 137
 138   det_confs_butmask(cptr, CONF_SERVER | CONF_UWORLD);
 139
 140   if (!IsHandshake(cptr))
 141     hAddClient(cptr);
 142   SetServer(cptr);
 143   cli_handler(cptr) = SERVER_HANDLER;
 144   Count_unknownbecomesserver(UserStats);
 145   SetBurst(cptr);
 146
 147 /*    nextping = CurrentTime; */
 148
 149   /*
 150    * NOTE: check for acptr->user == cptr->serv->user is necessary to insure
 151    * that we got the same one... bleah
 152    */
 153   if (cli_serv(cptr)->user && *(cli_serv(cptr))->by &&
 154       (acptr = findNUser(cli_serv(cptr)->by))) {
 155     if (cli_user(acptr) == cli_serv(cptr)->user) {
 156       sendcmdto_one(&me, CMD_NOTICE, acptr, "%C :Link with %s established.",
 157                     acptr, inpath);
 158     }
 159     else {
 160       /*
 161        * if not the same client, set by to empty string
 162        */
 163       acptr = 0;
 164       *(cli_serv(cptr))->by = '\0';
 165     }
 166   }
 167
 168   sendto_opmask_butone(acptr, SNO_OLDSNO, "Link with %s established.", inpath);
 169   cli_serv(cptr)->up = &me;
 170   cli_serv(cptr)->updown = add_dlink(&(cli_serv(&me))->down, cptr);
 171   sendto_opmask_butone(0, SNO_NETWORK, "Net junction: %s %s", cli_name(&me),
 172                        cli_name(cptr));
 173   SetJunction(cptr);
 174   /*
 175    * Old sendto_serv_but_one() call removed because we now
 176    * need to send different names to different servers
 177    * (domain name matching) Send new server to other servers.
 178    */
 179   for (i = 0; i <= HighestFd; i++)
 180   {
 181     if (!(acptr = LocalClientArray[i]) || !IsServer(acptr) ||
 182         acptr == cptr || IsMe(acptr))
 183       continue;
 184     if (!match(cli_name(&me), cli_name(cptr)))
 185       continue;
 186     sendcmdto_one(&me, CMD_SERVER, acptr,
 187                   "%s 2 0 %Tu J%02u %s%s +%s%s%s :%s", cli_name(cptr),
 188                   cli_serv(cptr)->timestamp, Protocol(cptr), NumServCap(cptr),
 189                   IsHub(cptr) ? "h" : "", IsService(cptr) ? "s" : "",
 190                   IsIPv6(cptr) ? "6" : "", cli_info(cptr));
 191   }
 192
 193   /* Send these as early as possible so that glined users/juped servers can
 194    * be removed from the network while the remote server is still chewing
 195    * our burst.
 196    */
 197   gline_burst(cptr);
 198   jupe_burst(cptr);
 199
 200   /*
 201    * Pass on my client information to the new server
 202    *
 203    * First, pass only servers (idea is that if the link gets
 204    * canceled because the server was already there,
 205    * there are no NICK's to be canceled...). Of course,
 206    * if cancellation occurs, all this info is sent anyway,
 207    * and I guess the link dies when a read is attempted...? --msa
 208    *
 209    * Note: Link cancellation to occur at this point means
 210    * that at least two servers from my fragment are building
 211    * up connection this other fragment at the same time, it's
 212    * a race condition, not the normal way of operation...
 213    */
 214
 215   for (acptr = &me; acptr; acptr = cli_prev(acptr)) {
 216     /* acptr->from == acptr for acptr == cptr */
 217     if (cli_from(acptr) == cptr)
 218       continue;
 219     if (IsServer(acptr)) {
 220       const char* protocol_str;
 221
 222       if (Protocol(acptr) > 9)
 223         protocol_str = IsBurst(acptr) ? "J" : "P";
 224       else
 225         protocol_str = IsBurst(acptr) ? "J0" : "P0";
 226
 227       if (0 == match(cli_name(&me), cli_name(acptr)))
 228         continue;
 229       sendcmdto_one(cli_serv(acptr)->up, CMD_SERVER, cptr,
 230                     "%s %d 0 %Tu %s%u %s%s +%s%s%s :%s", cli_name(acptr),
 231                     cli_hopcount(acptr) + 1, cli_serv(acptr)->timestamp,
 232                     protocol_str, Protocol(acptr), NumServCap(acptr),
 233                     IsHub(acptr) ? "h" : "", IsService(acptr) ? "s" : "",
 234                     IsIPv6(acptr) ? "6" : "", cli_info(acptr));
 235     }
 236   }
 237
 238   for (acptr = &me; acptr; acptr = cli_prev(acptr))
 239   {
 240     /* acptr->from == acptr for acptr == cptr */
 241     if (cli_from(acptr) == cptr)
 242       continue;
 243     if (IsUser(acptr))
 244     {
 245       char xxx_buf[25];
 246       char *s = umode_str(acptr);
 247       sendcmdto_one(cli_user(acptr)->server, CMD_NICK, cptr,
 248                     "%s %d %Tu %s %s %s%s%s%s %s%s :%s",
 249                     cli_name(acptr), cli_hopcount(acptr) + 1, cli_lastnick(acptr),
 250                     cli_user(acptr)->username, cli_user(acptr)->realhost,
 251                     *s ? "+" : "", s, *s ? " " : "",
 252                     iptobase64(xxx_buf, &cli_ip(acptr), sizeof(xxx_buf), IsIPv6(cptr)),
 253                     NumNick(acptr), cli_info(acptr));
 254     }
 255   }
 256   /*
 257    * Last, send the BURST.
 258    * (Or for 2.9 servers: pass all channels plus statuses)
 259    */
 260   {
 261     struct Channel *chptr;
 262     for (chptr = GlobalChannelList; chptr; chptr = chptr->next)
 263       send_channel_modes(cptr, chptr);
 264   }
 265   sendcmdto_one(&me, CMD_END_OF_BURST, cptr, "");
 266   return 0;
 267 }
 268