/* * ircd-ratbox: A slightly useful ircd. * s_serv.c: Server related functions. * * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center * Copyright (C) 1996-2002 Hybrid Development Team * Copyright (C) 2002-2005 ircd-ratbox development team * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * USA * * $Id: s_serv.c 3542 2007-08-01 20:18:12Z jilles $ */ #include "stdinc.h" #ifdef HAVE_LIBCRYPTO #include #endif #include "tools.h" #include "s_serv.h" #include "class.h" #include "client.h" #include "common.h" #include "event.h" #include "hash.h" #include "irc_string.h" #include "sprintf_irc.h" #include "ircd.h" #include "ircd_defs.h" #include "numeric.h" #include "packet.h" #include "res.h" #include "commio.h" #include "s_conf.h" #include "s_newconf.h" #include "s_log.h" #include "s_stats.h" #include "s_user.h" #include "scache.h" #include "send.h" #include "client.h" #include "memory.h" #include "channel.h" /* chcap_usage_counts stuff... */ #include "hook.h" #include "msg.h" #include "reject.h" extern char *crypt(); #ifndef INADDR_NONE #define INADDR_NONE ((unsigned int) 0xffffffff) #endif #ifndef HAVE_SOCKETPAIR static int inet_socketpair(int d, int type, int protocol, int sv[2]); #endif int MaxConnectionCount = 1; int MaxClientCount = 1; int refresh_user_links = 0; static char buf[BUFSIZE]; static void start_io(struct Client *server); static SlinkRplHnd slink_error; static SlinkRplHnd slink_zipstats; /* * list of recognized server capabilities. "TS" is not on the list * because all servers that we talk to already do TS, and the kludged * extra argument to "PASS" takes care of checking that. -orabidoo */ struct Capability captab[] = { /* name cap */ { "QS", CAP_QS }, { "EX", CAP_EX }, { "CHW", CAP_CHW}, { "IE", CAP_IE}, { "KLN", CAP_KLN}, { "GLN", CAP_GLN}, { "KNOCK", CAP_KNOCK}, { "ZIP", CAP_ZIP}, { "TB", CAP_TB}, { "UNKLN", CAP_UNKLN}, { "CLUSTER", CAP_CLUSTER}, { "ENCAP", CAP_ENCAP }, { "SERVICES", CAP_SERVICE }, { "RSFNC", CAP_RSFNC }, { "SAVE", CAP_SAVE }, { "EUID", CAP_EUID }, {0, 0} }; struct SlinkRplDef slinkrpltab[] = { {SLINKRPL_ERROR, slink_error, SLINKRPL_FLAG_DATA}, {SLINKRPL_ZIPSTATS, slink_zipstats, SLINKRPL_FLAG_DATA}, {0, 0, 0}, }; static int fork_server(struct Client *client_p); static CNCB serv_connect_callback; void slink_error(unsigned int rpl, unsigned int len, unsigned char *data, struct Client *server_p) { char squitreason[256]; s_assert(rpl == SLINKRPL_ERROR); s_assert(len < 256); data[len - 1] = '\0'; sendto_realops_snomask(SNO_GENERAL, L_ALL, "SlinkError for %s: %s", server_p->name, data); snprintf(squitreason, sizeof squitreason, "servlink error: %s", data); exit_client(server_p, server_p, &me, squitreason); } void slink_zipstats(unsigned int rpl, unsigned int len, unsigned char *data, struct Client *server_p) { struct ZipStats zipstats; u_int32_t in = 0, in_wire = 0, out = 0, out_wire = 0; int i = 0; s_assert(rpl == SLINKRPL_ZIPSTATS); s_assert(len == 16); s_assert(IsCapable(server_p, CAP_ZIP)); /* Yes, it needs to be done this way, no we cannot let the compiler * work with the pointer to the structure. This works around a GCC * bug on SPARC that affects all versions at the time of this writing. * I will feed you to the creatures living in RMS's beard if you do * not leave this as is, without being sure that you are not causing * regression for most of our installed SPARC base. * -jmallett, 04/27/2002 */ memcpy(&zipstats, &server_p->localClient->zipstats, sizeof(struct ZipStats)); in |= (data[i++] << 24); in |= (data[i++] << 16); in |= (data[i++] << 8); in |= (data[i++]); in_wire |= (data[i++] << 24); in_wire |= (data[i++] << 16); in_wire |= (data[i++] << 8); in_wire |= (data[i++]); out |= (data[i++] << 24); out |= (data[i++] << 16); out |= (data[i++] << 8); out |= (data[i++]); out_wire |= (data[i++] << 24); out_wire |= (data[i++] << 16); out_wire |= (data[i++] << 8); out_wire |= (data[i++]); zipstats.in += in; zipstats.inK += zipstats.in >> 10; zipstats.in &= 0x03ff; zipstats.in_wire += in_wire; zipstats.inK_wire += zipstats.in_wire >> 10; zipstats.in_wire &= 0x03ff; zipstats.out += out; zipstats.outK += zipstats.out >> 10; zipstats.out &= 0x03ff; zipstats.out_wire += out_wire; zipstats.outK_wire += zipstats.out_wire >> 10; zipstats.out_wire &= 0x03ff; if(zipstats.inK > 0) zipstats.in_ratio = (((double) (zipstats.inK - zipstats.inK_wire) / (double) zipstats.inK) * 100.00); else zipstats.in_ratio = 0; if(zipstats.outK > 0) zipstats.out_ratio = (((double) (zipstats.outK - zipstats.outK_wire) / (double) zipstats.outK) * 100.00); else zipstats.out_ratio = 0; memcpy(&server_p->localClient->zipstats, &zipstats, sizeof(struct ZipStats)); } void collect_zipstats(void *unused) { dlink_node *ptr; struct Client *target_p; DLINK_FOREACH(ptr, serv_list.head) { target_p = ptr->data; if(IsCapable(target_p, CAP_ZIP)) { /* only bother if we haven't already got something queued... */ if(!target_p->localClient->slinkq) { target_p->localClient->slinkq = MyMalloc(1); /* sigh.. */ target_p->localClient->slinkq[0] = SLINKCMD_ZIPSTATS; target_p->localClient->slinkq_ofs = 0; target_p->localClient->slinkq_len = 1; send_queued_slink_write(target_p->localClient->ctrlfd, target_p); } } } } /* * hunt_server - Do the basic thing in delivering the message (command) * across the relays to the specific server (server) for * actions. * * Note: The command is a format string and *MUST* be * of prefixed style (e.g. ":%s COMMAND %s ..."). * Command can have only max 8 parameters. * * server parv[server] is the parameter identifying the * target server. * * *WARNING* * parv[server] is replaced with the pointer to the * real servername from the matched client (I'm lazy * now --msa). * * returns: (see #defines) */ int hunt_server(struct Client *client_p, struct Client *source_p, const char *command, int server, int parc, const char *parv[]) { struct Client *target_p; int wilds; dlink_node *ptr; const char *old; char *new; /* * Assume it's me, if no server */ if(parc <= server || EmptyString(parv[server]) || match(parv[server], me.name) || (strcmp(parv[server], me.id) == 0)) return (HUNTED_ISME); new = LOCAL_COPY(parv[server]); /* * These are to pickup matches that would cause the following * message to go in the wrong direction while doing quick fast * non-matching lookups. */ if(MyClient(source_p)) target_p = find_named_client(new); else target_p = find_client(new); if(target_p) if(target_p->from == source_p->from && !MyConnect(target_p)) target_p = NULL; collapse(new); wilds = (strchr(new, '?') || strchr(new, '*')); /* * Again, if there are no wild cards involved in the server * name, use the hash lookup */ if(!target_p) { if(!wilds) { if(MyClient(source_p) || !IsDigit(parv[server][0])) sendto_one_numeric(source_p, ERR_NOSUCHSERVER, form_str(ERR_NOSUCHSERVER), parv[server]); return (HUNTED_NOSUCH); } else { target_p = NULL; DLINK_FOREACH(ptr, global_client_list.head) { if(match(new, ((struct Client *) (ptr->data))->name)) { target_p = ptr->data; break; } } } } if(target_p) { if(!IsRegistered(target_p)) { sendto_one_numeric(source_p, ERR_NOSUCHSERVER, form_str(ERR_NOSUCHSERVER), parv[server]); return HUNTED_NOSUCH; } if(IsMe(target_p) || MyClient(target_p)) return HUNTED_ISME; old = parv[server]; parv[server] = get_id(target_p, target_p); sendto_one(target_p, command, get_id(source_p, target_p), parv[1], parv[2], parv[3], parv[4], parv[5], parv[6], parv[7], parv[8]); parv[server] = old; return (HUNTED_PASS); } if(!IsDigit(parv[server][0])) sendto_one_numeric(source_p, ERR_NOSUCHSERVER, form_str(ERR_NOSUCHSERVER), parv[server]); return (HUNTED_NOSUCH); } /* * try_connections - scan through configuration and try new connections. * Returns the calendar time when the next call to this * function should be made latest. (No harm done if this * is called earlier or later...) */ void try_connections(void *unused) { struct Client *client_p; struct server_conf *server_p = NULL; struct server_conf *tmp_p; struct Class *cltmp; dlink_node *ptr; int connecting = FALSE; int confrq = 0; time_t next = 0; DLINK_FOREACH(ptr, server_conf_list.head) { tmp_p = ptr->data; if(ServerConfIllegal(tmp_p) || !ServerConfAutoconn(tmp_p)) continue; cltmp = tmp_p->class; /* * Skip this entry if the use of it is still on hold until * future. Otherwise handle this entry (and set it on hold * until next time). Will reset only hold times, if already * made one successfull connection... [this algorithm is * a bit fuzzy... -- msa >;) ] */ if(tmp_p->hold > CurrentTime) { if(next > tmp_p->hold || next == 0) next = tmp_p->hold; continue; } confrq = get_con_freq(cltmp); tmp_p->hold = CurrentTime + confrq; /* * Found a CONNECT config with port specified, scan clients * and see if this server is already connected? */ client_p = find_server(NULL, tmp_p->name); if(!client_p && (CurrUsers(cltmp) < MaxUsers(cltmp)) && !connecting) { server_p = tmp_p; /* We connect only one at time... */ connecting = TRUE; } if((next > tmp_p->hold) || (next == 0)) next = tmp_p->hold; } /* TODO: change this to set active flag to 0 when added to event! --Habeeb */ if(GlobalSetOptions.autoconn == 0) return; if(!connecting) return; /* move this connect entry to end.. */ dlinkDelete(&server_p->node, &server_conf_list); dlinkAddTail(server_p, &server_p->node, &server_conf_list); /* * We used to only print this if serv_connect() actually * suceeded, but since comm_tcp_connect() can call the callback * immediately if there is an error, we were getting error messages * in the wrong order. SO, we just print out the activated line, * and let serv_connect() / serv_connect_callback() print an * error afterwards if it fails. * -- adrian */ #ifndef HIDE_SERVERS_IPS sendto_realops_snomask(SNO_GENERAL, L_ALL, "Connection to %s[%s] activated.", server_p->name, server_p->host); #else sendto_realops_snomask(SNO_GENERAL, L_ALL, "Connection to %s activated", server_p->name); #endif serv_connect(server_p, 0); } int check_server(const char *name, struct Client *client_p) { struct server_conf *server_p = NULL; struct server_conf *tmp_p; dlink_node *ptr; int error = -1; s_assert(NULL != client_p); if(client_p == NULL) return error; if(!(client_p->localClient->passwd)) return -2; if(strlen(name) > HOSTLEN) return -4; DLINK_FOREACH(ptr, server_conf_list.head) { tmp_p = ptr->data; if(ServerConfIllegal(tmp_p)) continue; if(!match(tmp_p->name, name)) continue; error = -3; /* XXX: Fix me for IPv6 */ /* XXX sockhost is the IPv4 ip as a string */ if(match(tmp_p->host, client_p->host) || match(tmp_p->host, client_p->sockhost)) { error = -2; if(ServerConfEncrypted(tmp_p)) { if(!strcmp(tmp_p->passwd, crypt(client_p->localClient->passwd, tmp_p->passwd))) { server_p = tmp_p; break; } } else if(!strcmp(tmp_p->passwd, client_p->localClient->passwd)) { server_p = tmp_p; break; } } } if(server_p == NULL) return error; attach_server_conf(client_p, server_p); /* clear ZIP/TB if they support but we dont want them */ #ifdef HAVE_LIBZ if(!ServerConfCompressed(server_p)) #endif ClearCap(client_p, CAP_ZIP); if(!ServerConfTb(server_p)) ClearCap(client_p, CAP_TB); return 0; } /* * send_capabilities * * inputs - Client pointer to send to * - int flag of capabilities that this server has * output - NONE * side effects - send the CAPAB line to a server -orabidoo * */ void send_capabilities(struct Client *client_p, int cap_can_send) { struct Capability *cap; char msgbuf[BUFSIZE]; char *t; int tl; t = msgbuf; for (cap = captab; cap->name; ++cap) { if(cap->cap & cap_can_send) { tl = ircsprintf(t, "%s ", cap->name); t += tl; } } t--; *t = '\0'; sendto_one(client_p, "CAPAB :%s", msgbuf); } /* burst_modes_TS5() * * input - client to burst to, channel name, list to burst, mode flag * output - * side effects - client is sent a list of +b, or +e, or +I modes */ static void burst_modes_TS5(struct Client *client_p, char *chname, dlink_list *list, char flag) { dlink_node *ptr; struct Ban *banptr; char mbuf[MODEBUFLEN]; char pbuf[BUFSIZE]; int tlen; int mlen; int cur_len; char *mp; char *pp; int count = 0; mlen = ircsprintf(buf, ":%s MODE %s +", me.name, chname); cur_len = mlen; mp = mbuf; pp = pbuf; DLINK_FOREACH(ptr, list->head) { banptr = ptr->data; tlen = strlen(banptr->banstr) + 3; /* uh oh */ if(tlen > MODEBUFLEN) continue; if((count >= MAXMODEPARAMS) || ((cur_len + tlen + 2) > (BUFSIZE - 3))) { sendto_one(client_p, "%s%s %s", buf, mbuf, pbuf); mp = mbuf; pp = pbuf; cur_len = mlen; count = 0; } *mp++ = flag; *mp = '\0'; pp += ircsprintf(pp, "%s ", banptr->banstr); cur_len += tlen; count++; } if(count != 0) sendto_one(client_p, "%s%s %s", buf, mbuf, pbuf); } /* burst_modes_TS6() * * input - client to burst to, channel name, list to burst, mode flag * output - * side effects - client is sent a list of +b, +e, or +I modes */ static void burst_modes_TS6(struct Client *client_p, struct Channel *chptr, dlink_list *list, char flag) { dlink_node *ptr; struct Ban *banptr; char *t; int tlen; int mlen; int cur_len; cur_len = mlen = ircsprintf(buf, ":%s BMASK %ld %s %c :", me.id, (long) chptr->channelts, chptr->chname, flag); t = buf + mlen; DLINK_FOREACH(ptr, list->head) { banptr = ptr->data; tlen = strlen(banptr->banstr) + 1; /* uh oh */ if(cur_len + tlen > BUFSIZE - 3) { /* the one we're trying to send doesnt fit at all! */ if(cur_len == mlen) { s_assert(0); continue; } /* chop off trailing space and send.. */ *(t-1) = '\0'; sendto_one(client_p, "%s", buf); cur_len = mlen; t = buf + mlen; } ircsprintf(t, "%s ", banptr->banstr); t += tlen; cur_len += tlen; } /* cant ever exit the loop above without having modified buf, * chop off trailing space and send. */ *(t-1) = '\0'; sendto_one(client_p, "%s", buf); } /* * burst_TS5 * * inputs - client (server) to send nick towards * - client to send nick for * output - NONE * side effects - NICK message is sent towards given client_p */ static void burst_TS5(struct Client *client_p) { static char ubuf[12]; struct Client *target_p; struct Channel *chptr; struct membership *msptr; hook_data_client hclientinfo; hook_data_channel hchaninfo; dlink_node *ptr; dlink_node *uptr; char *t; int tlen, mlen; int cur_len = 0; hclientinfo.client = hchaninfo.client = client_p; DLINK_FOREACH(ptr, global_client_list.head) { target_p = ptr->data; if(!IsPerson(target_p)) continue; send_umode(NULL, target_p, 0, 0, ubuf); if(!*ubuf) { ubuf[0] = '+'; ubuf[1] = '\0'; } sendto_one(client_p, "NICK %s %d %ld %s %s %s %s :%s", target_p->name, target_p->hopcount + 1, (long) target_p->tsinfo, ubuf, target_p->username, target_p->host, target_p->user->server, target_p->info); if(IsDynSpoof(target_p)) sendto_one(client_p, ":%s ENCAP * REALHOST %s", target_p->name, target_p->orighost); if(!EmptyString(target_p->user->suser)) sendto_one(client_p, ":%s ENCAP * LOGIN %s", target_p->name, target_p->user->suser); if(ConfigFileEntry.burst_away && !EmptyString(target_p->user->away)) sendto_one(client_p, ":%s AWAY :%s", target_p->name, target_p->user->away); hclientinfo.target = target_p; call_hook(h_burst_client, &hclientinfo); } DLINK_FOREACH(ptr, global_channel_list.head) { chptr = ptr->data; if(*chptr->chname != '#') continue; cur_len = mlen = ircsprintf(buf, ":%s SJOIN %ld %s %s :", me.name, (long) chptr->channelts, chptr->chname, channel_modes(chptr, client_p)); t = buf + mlen; DLINK_FOREACH(uptr, chptr->members.head) { msptr = uptr->data; tlen = strlen(msptr->client_p->name) + 1; if(is_chanop(msptr)) tlen++; if(is_voiced(msptr)) tlen++; if(cur_len + tlen >= BUFSIZE - 3) { t--; *t = '\0'; sendto_one(client_p, "%s", buf); cur_len = mlen; t = buf + mlen; } ircsprintf(t, "%s%s ", find_channel_status(msptr, 1), msptr->client_p->name); cur_len += tlen; t += tlen; } if (dlink_list_length(&chptr->members) > 0) { /* remove trailing space */ t--; *t = '\0'; } sendto_one(client_p, "%s", buf); burst_modes_TS5(client_p, chptr->chname, &chptr->banlist, 'b'); if(IsCapable(client_p, CAP_EX)) burst_modes_TS5(client_p, chptr->chname, &chptr->exceptlist, 'e'); if(IsCapable(client_p, CAP_IE)) burst_modes_TS5(client_p, chptr->chname, &chptr->invexlist, 'I'); burst_modes_TS5(client_p, chptr->chname, &chptr->quietlist, 'q'); if(IsCapable(client_p, CAP_TB) && chptr->topic != NULL) sendto_one(client_p, ":%s TB %s %ld %s%s:%s", me.name, chptr->chname, (long) chptr->topic_time, ConfigChannel.burst_topicwho ? chptr->topic_info : "", ConfigChannel.burst_topicwho ? " " : "", chptr->topic); hchaninfo.chptr = chptr; call_hook(h_burst_channel, &hchaninfo); } hclientinfo.target = NULL; call_hook(h_burst_finished, &hclientinfo); } /* * burst_TS6 * * inputs - client (server) to send nick towards * - client to send nick for * output - NONE * side effects - NICK message is sent towards given client_p */ static void burst_TS6(struct Client *client_p) { static char ubuf[12]; struct Client *target_p; struct Channel *chptr; struct membership *msptr; hook_data_client hclientinfo; hook_data_channel hchaninfo; dlink_node *ptr; dlink_node *uptr; char *t; int tlen, mlen; int cur_len = 0; hclientinfo.client = hchaninfo.client = client_p; DLINK_FOREACH(ptr, global_client_list.head) { target_p = ptr->data; if(!IsPerson(target_p)) continue; send_umode(NULL, target_p, 0, 0, ubuf); if(!*ubuf) { ubuf[0] = '+'; ubuf[1] = '\0'; } if(has_id(target_p) && IsCapable(client_p, CAP_EUID)) sendto_one(client_p, ":%s EUID %s %d %ld %s %s %s %s %s %s %s :%s", target_p->servptr->id, target_p->name, target_p->hopcount + 1, (long) target_p->tsinfo, ubuf, target_p->username, target_p->host, IsIPSpoof(target_p) ? "0" : target_p->sockhost, target_p->id, IsDynSpoof(target_p) ? target_p->orighost : "*", EmptyString(target_p->user->suser) ? "*" : target_p->user->suser, target_p->info); else if(has_id(target_p)) sendto_one(client_p, ":%s UID %s %d %ld %s %s %s %s %s :%s", target_p->servptr->id, target_p->name, target_p->hopcount + 1, (long) target_p->tsinfo, ubuf, target_p->username, target_p->host, IsIPSpoof(target_p) ? "0" : target_p->sockhost, target_p->id, target_p->info); else sendto_one(client_p, "NICK %s %d %ld %s %s %s %s :%s", target_p->name, target_p->hopcount + 1, (long) target_p->tsinfo, ubuf, target_p->username, target_p->host, target_p->user->server, target_p->info); if(!has_id(target_p) || !IsCapable(client_p, CAP_EUID)) { if(IsDynSpoof(target_p)) sendto_one(client_p, ":%s ENCAP * REALHOST %s", use_id(target_p), target_p->orighost); if(!EmptyString(target_p->user->suser)) sendto_one(client_p, ":%s ENCAP * LOGIN %s", use_id(target_p), target_p->user->suser); } if(ConfigFileEntry.burst_away && !EmptyString(target_p->user->away)) sendto_one(client_p, ":%s AWAY :%s", use_id(target_p), target_p->user->away); hclientinfo.target = target_p; call_hook(h_burst_client, &hclientinfo); } DLINK_FOREACH(ptr, global_channel_list.head) { chptr = ptr->data; if(*chptr->chname != '#') continue; cur_len = mlen = ircsprintf(buf, ":%s SJOIN %ld %s %s :", me.id, (long) chptr->channelts, chptr->chname, channel_modes(chptr, client_p)); t = buf + mlen; DLINK_FOREACH(uptr, chptr->members.head) { msptr = uptr->data; tlen = strlen(use_id(msptr->client_p)) + 1; if(is_chanop(msptr)) tlen++; if(is_voiced(msptr)) tlen++; if(cur_len + tlen >= BUFSIZE - 3) { *(t-1) = '\0'; sendto_one(client_p, "%s", buf); cur_len = mlen; t = buf + mlen; } ircsprintf(t, "%s%s ", find_channel_status(msptr, 1), use_id(msptr->client_p)); cur_len += tlen; t += tlen; } if (dlink_list_length(&chptr->members) > 0) { /* remove trailing space */ *(t-1) = '\0'; } sendto_one(client_p, "%s", buf); if(dlink_list_length(&chptr->banlist) > 0) burst_modes_TS6(client_p, chptr, &chptr->banlist, 'b'); if(IsCapable(client_p, CAP_EX) && dlink_list_length(&chptr->exceptlist) > 0) burst_modes_TS6(client_p, chptr, &chptr->exceptlist, 'e'); if(IsCapable(client_p, CAP_IE) && dlink_list_length(&chptr->invexlist) > 0) burst_modes_TS6(client_p, chptr, &chptr->invexlist, 'I'); if(dlink_list_length(&chptr->quietlist) > 0) burst_modes_TS6(client_p, chptr, &chptr->quietlist, 'q'); if(IsCapable(client_p, CAP_TB) && chptr->topic != NULL) sendto_one(client_p, ":%s TB %s %ld %s%s:%s", me.id, chptr->chname, (long) chptr->topic_time, ConfigChannel.burst_topicwho ? chptr->topic_info : "", ConfigChannel.burst_topicwho ? " " : "", chptr->topic); hchaninfo.chptr = chptr; call_hook(h_burst_channel, &hchaninfo); } hclientinfo.target = NULL; call_hook(h_burst_finished, &hclientinfo); } /* * show_capabilities - show current server capabilities * * inputs - pointer to an struct Client * output - pointer to static string * side effects - build up string representing capabilities of server listed */ const char * show_capabilities(struct Client *target_p) { static char msgbuf[BUFSIZE]; struct Capability *cap; char *t; int tl; t = msgbuf; tl = ircsprintf(msgbuf, "TS "); t += tl; if(!IsServer(target_p) || !target_p->serv->caps) /* short circuit if no caps */ { msgbuf[2] = '\0'; return msgbuf; } for (cap = captab; cap->cap; ++cap) { if(cap->cap & target_p->serv->caps) { tl = ircsprintf(t, "%s ", cap->name); t += tl; } } t--; *t = '\0'; return msgbuf; } /* * server_estab * * inputs - pointer to a struct Client * output - * side effects - */ int server_estab(struct Client *client_p) { struct Client *target_p; struct server_conf *server_p; hook_data_client hdata; char *host; dlink_node *ptr; s_assert(NULL != client_p); if(client_p == NULL) return -1; ClearAccess(client_p); host = client_p->name; if((server_p = client_p->localClient->att_sconf) == NULL) { /* This shouldn't happen, better tell the ops... -A1kmm */ sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL, "Warning: Lost connect{} block for server %s!", host); return exit_client(client_p, client_p, client_p, "Lost connect{} block!"); } /* We shouldn't have to check this, it should already done before * server_estab is called. -A1kmm */ if(client_p->localClient->passwd) { memset(client_p->localClient->passwd, 0, strlen(client_p->localClient->passwd)); MyFree(client_p->localClient->passwd); client_p->localClient->passwd = NULL; } /* Its got identd , since its a server */ SetGotId(client_p); /* If there is something in the serv_list, it might be this * connecting server.. */ if(!ServerInfo.hub && serv_list.head) { if(client_p != serv_list.head->data || serv_list.head->next) { ServerStats->is_ref++; sendto_one(client_p, "ERROR :I'm a leaf not a hub"); return exit_client(client_p, client_p, client_p, "I'm a leaf"); } } if(IsUnknown(client_p)) { /* * jdc -- 1. Use EmptyString(), not [0] index reference. * 2. Check ->spasswd, not ->passwd. */ if(!EmptyString(server_p->spasswd)) { /* kludge, if we're not using TS6, dont ever send * ourselves as being TS6 capable. */ if(ServerInfo.use_ts6) sendto_one(client_p, "PASS %s TS %d :%s", server_p->spasswd, TS_CURRENT, me.id); else sendto_one(client_p, "PASS %s :TS", server_p->spasswd); } /* pass info to new server */ send_capabilities(client_p, default_server_capabs | (ServerConfCompressed(server_p) ? CAP_ZIP_SUPPORTED : 0) | (ServerConfTb(server_p) ? CAP_TB : 0)); sendto_one(client_p, "SERVER %s 1 :%s%s", me.name, ConfigServerHide.hidden ? "(H) " : "", (me.info[0]) ? (me.info) : "IRCers United"); } if(!comm_set_buffers(client_p->localClient->fd, READBUF_SIZE)) report_error(SETBUF_ERROR_MSG, get_server_name(client_p, SHOW_IP), log_client_name(client_p, SHOW_IP), errno); /* Hand the server off to servlink now */ if(IsCapable(client_p, CAP_ZIP)) { if(fork_server(client_p) < 0) { sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL, "Warning: fork failed for server %s -- check servlink_path (%s)", get_server_name(client_p, HIDE_IP), ConfigFileEntry.servlink_path); return exit_client(client_p, client_p, client_p, "Fork failed"); } start_io(client_p); SetServlink(client_p); } sendto_one(client_p, "SVINFO %d %d 0 :%ld", TS_CURRENT, TS_MIN, CurrentTime); client_p->servptr = &me; if(IsAnyDead(client_p)) return CLIENT_EXITED; SetServer(client_p); /* Update the capability combination usage counts */ set_chcap_usage_counts(client_p); dlinkAdd(client_p, &client_p->lnode, &me.serv->servers); del_unknown_ip(client_p); dlinkMoveNode(&client_p->localClient->tnode, &unknown_list, &serv_list); dlinkAddTailAlloc(client_p, &global_serv_list); if(has_id(client_p)) add_to_id_hash(client_p->id, client_p); add_to_client_hash(client_p->name, client_p); /* doesnt duplicate client_p->serv if allocated this struct already */ make_server(client_p); client_p->serv->up = me.name; client_p->serv->upid = me.id; client_p->serv->caps = client_p->localClient->caps; if(client_p->localClient->fullcaps) { DupString(client_p->serv->fullcaps, client_p->localClient->fullcaps); MyFree(client_p->localClient->fullcaps); client_p->localClient->fullcaps = NULL; } /* add it to scache */ find_or_add(client_p->name); client_p->localClient->firsttime = CurrentTime; /* fixing eob timings.. -gnp */ if((dlink_list_length(&lclient_list) + dlink_list_length(&serv_list)) > (unsigned long)MaxConnectionCount) MaxConnectionCount = dlink_list_length(&lclient_list) + dlink_list_length(&serv_list); /* Show the real host/IP to admins */ sendto_realops_snomask(SNO_GENERAL, L_ALL, "Link with %s established: (%s) link", get_server_name(client_p, SHOW_IP), show_capabilities(client_p)); ilog(L_SERVER, "Link with %s established: (%s) link", log_client_name(client_p, SHOW_IP), show_capabilities(client_p)); hdata.client = &me; hdata.target = client_p; call_hook(h_server_introduced, &hdata); if(HasServlink(client_p)) { /* we won't overflow FD_DESC_SZ here, as it can hold * client_p->name + 64 */ comm_note(client_p->localClient->fd, "slink data: %s", client_p->name); comm_note(client_p->localClient->ctrlfd, "slink ctrl: %s", client_p->name); } else comm_note(client_p->localClient->fd, "Server: %s", client_p->name); /* ** Old sendto_serv_but_one() call removed because we now ** need to send different names to different servers ** (domain name matching) Send new server to other servers. */ DLINK_FOREACH(ptr, serv_list.head) { target_p = ptr->data; if(target_p == client_p) continue; if(has_id(target_p) && has_id(client_p)) { sendto_one(target_p, ":%s SID %s 2 %s :%s%s", me.id, client_p->name, client_p->id, IsHidden(client_p) ? "(H) " : "", client_p->info); if(IsCapable(target_p, CAP_ENCAP) && !EmptyString(client_p->serv->fullcaps)) sendto_one(target_p, ":%s ENCAP * GCAP :%s", client_p->id, client_p->serv->fullcaps); } else { sendto_one(target_p, ":%s SERVER %s 2 :%s%s", me.name, client_p->name, IsHidden(client_p) ? "(H) " : "", client_p->info); if(IsCapable(target_p, CAP_ENCAP) && !EmptyString(client_p->serv->fullcaps)) sendto_one(target_p, ":%s ENCAP * GCAP :%s", client_p->name, client_p->serv->fullcaps); } } /* ** Pass on my client information to the new server ** ** First, pass only servers (idea is that if the link gets ** cancelled beacause the server was already there, ** there are no NICK's to be cancelled...). Of course, ** if cancellation occurs, all this info is sent anyway, ** and I guess the link dies when a read is attempted...? --msa ** ** Note: Link cancellation to occur at this point means ** that at least two servers from my fragment are building ** up connection this other fragment at the same time, it's ** a race condition, not the normal way of operation... ** ** ALSO NOTE: using the get_client_name for server names-- ** see previous *WARNING*!!! (Also, original inpath ** is destroyed...) */ DLINK_FOREACH(ptr, global_serv_list.head) { target_p = ptr->data; /* target_p->from == target_p for target_p == client_p */ if(IsMe(target_p) || target_p->from == client_p) continue; /* presumption, if target has an id, so does its uplink */ if(has_id(client_p) && has_id(target_p)) sendto_one(client_p, ":%s SID %s %d %s :%s%s", target_p->serv->upid, target_p->name, target_p->hopcount + 1, target_p->id, IsHidden(target_p) ? "(H) " : "", target_p->info); else sendto_one(client_p, ":%s SERVER %s %d :%s%s", target_p->serv->up, target_p->name, target_p->hopcount + 1, IsHidden(target_p) ? "(H) " : "", target_p->info); if(IsCapable(client_p, CAP_ENCAP) && !EmptyString(target_p->serv->fullcaps)) sendto_one(client_p, ":%s ENCAP * GCAP :%s", get_id(target_p, client_p), target_p->serv->fullcaps); } if(has_id(client_p)) burst_TS6(client_p); else burst_TS5(client_p); /* Always send a PING after connect burst is done */ sendto_one(client_p, "PING :%s", get_id(&me, client_p)); free_pre_client(client_p); return 0; } static void start_io(struct Client *server) { unsigned char *iobuf; int c = 0; int linecount = 0; int linelen; iobuf = MyMalloc(256); /* XXX: This seems arbitrary. Perhaps make it IRCD_BUFSIZE? --nenolod */ if(IsCapable(server, CAP_ZIP)) { /* ziplink */ iobuf[c++] = SLINKCMD_SET_ZIP_OUT_LEVEL; iobuf[c++] = 0; /* | */ iobuf[c++] = 1; /* \ len is 1 */ iobuf[c++] = ConfigFileEntry.compression_level; iobuf[c++] = SLINKCMD_START_ZIP_IN; iobuf[c++] = SLINKCMD_START_ZIP_OUT; } while (MyConnect(server)) { linecount++; iobuf = MyRealloc(iobuf, (c + READBUF_SIZE + 64)); /* store data in c+3 to allow for SLINKCMD_INJECT_RECVQ and len u16 */ linelen = linebuf_get(&server->localClient->buf_recvq, (char *) (iobuf + c + 3), READBUF_SIZE, LINEBUF_PARTIAL, LINEBUF_RAW); /* include partial lines */ if(linelen) { iobuf[c++] = SLINKCMD_INJECT_RECVQ; iobuf[c++] = (linelen >> 8); iobuf[c++] = (linelen & 0xff); c += linelen; } else break; } while (MyConnect(server)) { linecount++; iobuf = MyRealloc(iobuf, (c + BUF_DATA_SIZE + 64)); /* store data in c+3 to allow for SLINKCMD_INJECT_RECVQ and len u16 */ linelen = linebuf_get(&server->localClient->buf_sendq, (char *) (iobuf + c + 3), READBUF_SIZE, LINEBUF_PARTIAL, LINEBUF_PARSED); /* include partial lines */ if(linelen) { iobuf[c++] = SLINKCMD_INJECT_SENDQ; iobuf[c++] = (linelen >> 8); iobuf[c++] = (linelen & 0xff); c += linelen; } else break; } /* start io */ iobuf[c++] = SLINKCMD_INIT; server->localClient->slinkq = iobuf; server->localClient->slinkq_ofs = 0; server->localClient->slinkq_len = c; /* schedule a write */ send_queued_slink_write(server->localClient->ctrlfd, server); } /* * fork_server * * inputs - struct Client *server * output - success: 0 / failure: -1 * side effect - fork, and exec SERVLINK to handle this connection */ static int fork_server(struct Client *server) { int ret; int i; int ctrl_fds[2]; int data_fds[2]; char fd_str[4][6]; char *kid_argv[7]; char slink[] = "-slink"; /* ctrl */ #ifdef HAVE_SOCKETPAIR if(socketpair(AF_UNIX, SOCK_STREAM, 0, ctrl_fds) < 0) #else if(inet_socketpair(AF_INET,SOCK_STREAM, 0, ctrl_fds) < 0) #endif goto fork_error; /* data */ #ifdef HAVE_SOCKETPAIR if(socketpair(AF_UNIX, SOCK_STREAM, 0, data_fds) < 0) #else if(inet_socketpair(AF_INET,SOCK_STREAM, 0, data_fds) < 0) #endif goto fork_error; #ifdef __CYGWIN__ if((ret = vfork()) < 0) #else if((ret = fork()) < 0) #endif goto fork_error; else if(ret == 0) { int maxconn = comm_get_maxconnections(); /* set our fds as non blocking and close everything else */ for (i = 0; i < maxconn; i++) { if((i == ctrl_fds[1]) || (i == data_fds[1]) || (i == server->localClient->fd)) { comm_set_nb(i); } else { #ifdef __CYGWIN__ if(i > 2) /* don't close std* */ #endif close(i); } } ircsnprintf(fd_str[0], sizeof(fd_str[0]), "%d", ctrl_fds[1]); ircsnprintf(fd_str[1], sizeof(fd_str[1]), "%d", data_fds[1]); ircsnprintf(fd_str[2], sizeof(fd_str[2]), "%d", server->localClient->fd); kid_argv[0] = slink; kid_argv[1] = fd_str[0]; kid_argv[2] = fd_str[1]; kid_argv[3] = fd_str[2]; kid_argv[4] = NULL; /* exec servlink program */ execv(ConfigFileEntry.servlink_path, kid_argv); /* We're still here, abort. */ _exit(1); } else { comm_close(server->localClient->fd); /* close the childs end of the pipes */ close(ctrl_fds[1]); close(data_fds[1]); s_assert(server->localClient); server->localClient->ctrlfd = ctrl_fds[0]; server->localClient->fd = data_fds[0]; if(!comm_set_nb(server->localClient->fd)) { report_error(NONB_ERROR_MSG, get_server_name(server, SHOW_IP), log_client_name(server, SHOW_IP), errno); } if(!comm_set_nb(server->localClient->ctrlfd)) { report_error(NONB_ERROR_MSG, get_server_name(server, SHOW_IP), log_client_name(server, SHOW_IP), errno); } comm_open(server->localClient->ctrlfd, FD_SOCKET, NULL); comm_open(server->localClient->fd, FD_SOCKET, NULL); read_ctrl_packet(server->localClient->ctrlfd, server); read_packet(server->localClient->fd, server); } return 0; fork_error: /* this is ugly, but nicer than repeating * about 50 close() statements everywhre... */ close(data_fds[0]); close(data_fds[1]); close(ctrl_fds[0]); close(ctrl_fds[1]); return -1; } /* * New server connection code * Based upon the stuff floating about in s_bsd.c * -- adrian */ /* * serv_connect() - initiate a server connection * * inputs - pointer to conf * - pointer to client doing the connet * output - * side effects - * * This code initiates a connection to a server. It first checks to make * sure the given server exists. If this is the case, it creates a socket, * creates a client, saves the socket information in the client, and * initiates a connection to the server through comm_connect_tcp(). The * completion of this goes through serv_completed_connection(). * * We return 1 if the connection is attempted, since we don't know whether * it suceeded or not, and 0 if it fails in here somewhere. */ int serv_connect(struct server_conf *server_p, struct Client *by) { struct Client *client_p; struct irc_sockaddr_storage myipnum; int fd; s_assert(server_p != NULL); if(server_p == NULL) return 0; /* * Make sure this server isn't already connected */ if((client_p = find_server(NULL, server_p->name))) { sendto_realops_snomask(SNO_GENERAL, L_ALL, "Server %s already present from %s", server_p->name, get_server_name(client_p, SHOW_IP)); if(by && IsPerson(by) && !MyClient(by)) sendto_one_notice(by, ":Server %s already present from %s", server_p->name, get_server_name(client_p, SHOW_IP)); return 0; } /* create a socket for the server connection */ if((fd = comm_socket(server_p->aftype, SOCK_STREAM, 0, NULL)) < 0) { /* Eek, failure to create the socket */ report_error("opening stream socket to %s: %s", server_p->name, server_p->name, errno); return 0; } /* servernames are always guaranteed under HOSTLEN chars */ comm_note(fd, "Server: %s", server_p->name); /* Create a local client */ client_p = make_client(NULL); /* Copy in the server, hostname, fd * The sockhost may be a hostname, this will be corrected later * -- jilles */ strlcpy(client_p->name, server_p->name, sizeof(client_p->name)); strlcpy(client_p->host, server_p->host, sizeof(client_p->host)); strlcpy(client_p->sockhost, server_p->host, sizeof(client_p->sockhost)); client_p->localClient->fd = fd; /* * Set up the initial server evilness, ripped straight from * connect_server(), so don't blame me for it being evil. * -- adrian */ if(!comm_set_buffers(client_p->localClient->fd, READBUF_SIZE)) { report_error(SETBUF_ERROR_MSG, get_server_name(client_p, SHOW_IP), log_client_name(client_p, SHOW_IP), errno); } /* * Attach config entries to client here rather than in * serv_connect_callback(). This to avoid null pointer references. */ attach_server_conf(client_p, server_p); /* * at this point we have a connection in progress and C/N lines * attached to the client, the socket info should be saved in the * client and it should either be resolved or have a valid address. * * The socket has been connected or connect is in progress. */ make_server(client_p); if(by && IsPerson(by)) { strcpy(client_p->serv->by, by->name); if(client_p->serv->user) free_user(client_p->serv->user, NULL); client_p->serv->user = by->user; by->user->refcnt++; } else { strcpy(client_p->serv->by, "AutoConn."); if(client_p->serv->user) free_user(client_p->serv->user, NULL); client_p->serv->user = NULL; } client_p->serv->up = me.name; client_p->serv->upid = me.id; SetConnecting(client_p); dlinkAddTail(client_p, &client_p->node, &global_client_list); /* log */ ilog(L_SERVER, "Connecting to %s[%s] port %d (%s)", server_p->name, server_p->host, server_p->port, #ifdef IPV6 server_p->aftype == AF_INET6 ? "IPv6" : #endif (server_p->aftype == AF_INET ? "IPv4" : "?")); if(ServerConfVhosted(server_p)) { memcpy(&myipnum, &server_p->my_ipnum, sizeof(myipnum)); ((struct sockaddr_in *)&myipnum)->sin_port = 0; myipnum.ss_family = server_p->aftype; } else if(server_p->aftype == AF_INET && ServerInfo.specific_ipv4_vhost) { memcpy(&myipnum, &ServerInfo.ip, sizeof(myipnum)); ((struct sockaddr_in *)&myipnum)->sin_port = 0; myipnum.ss_family = AF_INET; SET_SS_LEN(myipnum, sizeof(struct sockaddr_in)); } #ifdef IPV6 else if((server_p->aftype == AF_INET6) && ServerInfo.specific_ipv6_vhost) { memcpy(&myipnum, &ServerInfo.ip6, sizeof(myipnum)); ((struct sockaddr_in6 *)&myipnum)->sin6_port = 0; myipnum.ss_family = AF_INET6; SET_SS_LEN(myipnum, sizeof(struct sockaddr_in6)); } #endif else { comm_connect_tcp(client_p->localClient->fd, server_p->host, server_p->port, NULL, 0, serv_connect_callback, client_p, server_p->aftype, ConfigFileEntry.connect_timeout); return 1; } comm_connect_tcp(client_p->localClient->fd, server_p->host, server_p->port, (struct sockaddr *) &myipnum, GET_SS_LEN(myipnum), serv_connect_callback, client_p, myipnum.ss_family, ConfigFileEntry.connect_timeout); return 1; } /* * serv_connect_callback() - complete a server connection. * * This routine is called after the server connection attempt has * completed. If unsucessful, an error is sent to ops and the client * is closed. If sucessful, it goes through the initialisation/check * procedures, the capabilities are sent, and the socket is then * marked for reading. */ static void serv_connect_callback(int fd, int status, void *data) { struct Client *client_p = data; struct server_conf *server_p; char *errstr; fde_t *F = comm_locate_fd(fd); /* First, make sure its a real client! */ s_assert(client_p != NULL); s_assert(client_p->localClient->fd == fd); if(client_p == NULL) return; /* while we were waiting for the callback, its possible this already * linked in.. --fl */ if(find_server(NULL, client_p->name) != NULL) { exit_client(client_p, client_p, &me, "Server Exists"); return; } /* Next, for backward purposes, record the ip of the server */ memcpy(&client_p->localClient->ip, &F->connect.hostaddr, sizeof client_p->localClient->ip); /* Set sockhost properly now -- jilles */ inetntop_sock((struct sockaddr *)&F->connect.hostaddr, client_p->sockhost, sizeof client_p->sockhost); /* Check the status */ if(status != COMM_OK) { /* COMM_ERR_TIMEOUT wont have an errno associated with it, * the others will.. --fl */ if(status == COMM_ERR_TIMEOUT) { sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL, "Error connecting to %s[%s]: %s", client_p->name, #ifdef HIDE_SERVERS_IPS "255.255.255.255", #else client_p->host, #endif comm_errstr(status)); ilog(L_SERVER, "Error connecting to %s[%s]: %s", client_p->name, client_p->sockhost, comm_errstr(status)); } else { errstr = strerror(comm_get_sockerr(fd)); sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL, "Error connecting to %s[%s]: %s (%s)", client_p->name, #ifdef HIDE_SERVERS_IPS "255.255.255.255", #else client_p->host, #endif comm_errstr(status), errstr); ilog(L_SERVER, "Error connecting to %s[%s]: %s (%s)", client_p->name, client_p->sockhost, comm_errstr(status), errstr); } exit_client(client_p, client_p, &me, comm_errstr(status)); return; } /* COMM_OK, so continue the connection procedure */ /* Get the C/N lines */ if((server_p = client_p->localClient->att_sconf) == NULL) { sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL, "Lost connect{} block for %s", get_server_name(client_p, HIDE_IP)); exit_client(client_p, client_p, &me, "Lost connect{} block"); return; } /* Next, send the initial handshake */ SetHandshake(client_p); /* kludge, if we're not using TS6, dont ever send * ourselves as being TS6 capable. */ if(!EmptyString(server_p->spasswd)) { if(ServerInfo.use_ts6) sendto_one(client_p, "PASS %s TS %d :%s", server_p->spasswd, TS_CURRENT, me.id); else sendto_one(client_p, "PASS %s :TS", server_p->spasswd); } /* pass my info to the new server */ send_capabilities(client_p, default_server_capabs | (ServerConfCompressed(server_p) ? CAP_ZIP_SUPPORTED : 0) | (ServerConfTb(server_p) ? CAP_TB : 0)); sendto_one(client_p, "SERVER %s 1 :%s%s", me.name, ConfigServerHide.hidden ? "(H) " : "", me.info); /* * If we've been marked dead because a send failed, just exit * here now and save everyone the trouble of us ever existing. */ if(IsAnyDead(client_p)) { sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) ? L_NETWIDE : L_ALL, "%s went dead during handshake", client_p->name); exit_client(client_p, client_p, &me, "Went dead during handshake"); return; } /* don't move to serv_list yet -- we haven't sent a burst! */ /* If we get here, we're ok, so lets start reading some data */ read_packet(fd, client_p); } #ifndef HAVE_SOCKETPAIR static int inet_socketpair(int d, int type, int protocol, int sv[2]) { struct sockaddr_in addr1, addr2, addr3; int addr3_len = sizeof(addr3); int fd, rc; int port_no = 20000; if(d != AF_INET || type != SOCK_STREAM || protocol) { errno = EAFNOSUPPORT; return -1; } if(((sv[0] = socket(AF_INET, SOCK_STREAM, 0)) < 0) || ((sv[1] = socket(AF_INET, SOCK_STREAM, 0)) < 0)) return -1; addr1.sin_port = htons(port_no); addr1.sin_family = AF_INET; addr1.sin_addr.s_addr = htonl(INADDR_LOOPBACK); while ((rc = bind (sv[0], (struct sockaddr *) &addr1, sizeof (addr1))) < 0 && errno == EADDRINUSE) addr1.sin_port = htons(++port_no); if(rc < 0) return -1; if(listen(sv[0], 1) < 0) { close(sv[0]); close(sv[1]); return -1; } addr2.sin_port = htons(port_no); addr2.sin_family = AF_INET; addr2.sin_addr.s_addr = htonl(INADDR_LOOPBACK); if(connect (sv[1], (struct sockaddr *) &addr2, sizeof (addr2)) < 0) { close(sv[0]); close(sv[1]); return -1; } if((fd = accept(sv[1], (struct sockaddr *) &addr3, &addr3_len)) < 0) { close(sv[0]); close(sv[1]); return -1; } close(sv[0]); sv[0] = fd; return(0); } #endif