/* * mr_pong - registration message handler * * parv[0] = sender prefix * parv[1] = pong response echo * NOTE: cptr is always unregistered here */ int mr_pong(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) { assert(0 != cptr); assert(cptr == sptr); assert(!IsRegistered(sptr)); ClrFlag(cptr, FLAG_PINGSENT); cli_lasttime(cptr) = CurrentTime; /* * Check to see if this is a PONG :cookie reply from an * unregistered user. If so, process it. -record */ if (0 != cli_cookie(sptr) && COOKIE_VERIFIED != cli_cookie(sptr)) { if (parc > 1 && cli_cookie(sptr) == atol(parv[parc - 1])) { cli_cookie(sptr) = COOKIE_VERIFIED; if (cli_user(sptr) && *(cli_user(sptr))->host && (cli_name(sptr))[0]) /* * NICK and USER OK */ return register_user(cptr, sptr, cli_name(sptr), cli_user(sptr)->username); } else send_reply(sptr, SND_EXPLICIT | ERR_BADPING, ":To connect, type /QUOTE PONG %u", cli_cookie(sptr)); } return 0; }
/** Complete non-blocking connect()-sequence. Check access and * terminate connection, if trouble detected. * @param cptr Client to which we have connected, with all ConfItem structs attached. * @return Zero on failure (caller should exit_client()), non-zero on success. */ static int completed_connection(struct Client* cptr) { struct ConfItem *aconf; time_t newts; struct Client *acptr; int i; assert(0 != cptr); /* * get the socket status from the fd first to check if * connection actually succeeded */ if ((cli_error(cptr) = os_get_sockerr(cli_fd(cptr)))) { const char* msg = strerror(cli_error(cptr)); if (!msg) msg = "Unknown error"; sendto_opmask_butone(0, SNO_OLDSNO, "Connection failed to %s: %s", cli_name(cptr), msg); return 0; } if (!(aconf = find_conf_byname(cli_confs(cptr), cli_name(cptr), CONF_SERVER))) { sendto_opmask_butone(0, SNO_OLDSNO, "Lost Server Line for %s", cli_name(cptr)); return 0; } if (s_state(&(cli_socket(cptr))) == SS_CONNECTING) socket_state(&(cli_socket(cptr)), SS_CONNECTED); if (!EmptyString(aconf->passwd)) sendrawto_one(cptr, MSG_PASS " :%s", aconf->passwd); /* * Create a unique timestamp */ newts = TStime(); for (i = HighestFd; i > -1; --i) { if ((acptr = LocalClientArray[i]) && (IsServer(acptr) || IsHandshake(acptr))) { if (cli_serv(acptr)->timestamp >= newts) newts = cli_serv(acptr)->timestamp + 1; } } assert(0 != cli_serv(cptr)); cli_serv(cptr)->timestamp = newts; SetHandshake(cptr); /* * Make us timeout after twice the timeout for DNS look ups */ cli_lasttime(cptr) = CurrentTime; ClearPingSent(cptr); sendrawto_one(cptr, MSG_SERVER " %s 1 %Tu %Tu J%s %s%s +%s6n :%s", cli_name(&me), cli_serv(&me)->timestamp, newts, MAJOR_PROTOCOL, NumServCap(&me), feature_bool(FEAT_HUB) ? "h" : "", cli_info(&me)); return (IsDead(cptr)) ? 0 : 1; }
/* * m_pong - normal message handler * * parv[0] = sender prefix * parv[1] = origin * parv[2] = destination */ int m_pong(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) { assert(0 != cptr); assert(cptr == sptr); ClrFlag(cptr, FLAG_PINGSENT); cli_lasttime(cptr) = CurrentTime; return 0; }
/* * m_pong - normal message handler * * parv[0] = sender prefix * parv[1] = origin * parv[2] = destination */ int m_pong(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) { assert(0 != cptr); assert(cptr == sptr); ClearPingSent(cptr); cli_lasttime(cptr) = CurrentTime; return 0; }
/* * release_auth_client - release auth client from auth system * this adds the client into the local client lists so it can be read by * the main io processing loop */ static void release_auth_client(struct Client* client) { assert(0 != client); cli_auth(client) = 0; cli_lasttime(client) = cli_since(client) = CurrentTime; if (cli_fd(client) > HighestFd) HighestFd = cli_fd(client); LocalClientArray[cli_fd(client)] = client; add_client_to_list(client); socket_events(&(cli_socket(client)), SOCK_ACTION_SET | SOCK_EVENT_READABLE); Debug((DEBUG_INFO, "Auth: release_auth_client %s@%s[%s]", cli_username(client), cli_sockhost(client), cli_sock_ip(client))); }
/* * Create a new struct Client structure and set it to initial state. * * from == NULL, create local client (a client connected to a socket). * * from != NULL, create remote client (behind a socket associated with * the client defined by 'from'). * ('from' is a local client!!). */ struct Client* make_client(struct Client *from, int status) { struct Client* cptr = 0; struct Connection* con = 0; assert(!from || cli_verify(from)); cptr = alloc_client(); assert(0 != cptr); assert(!cli_magic(cptr)); assert(0 == from || 0 != cli_connect(from)); if (!from) { /* local client, allocate a struct Connection */ con = alloc_connection(); assert(0 != con); assert(!con_magic(con)); con_magic(con) = CONNECTION_MAGIC; con_fd(con) = -1; /* initialize struct Connection */ con_freeflag(con) = 0; con_nextnick(con) = CurrentTime - NICK_DELAY; con_nexttarget(con) = CurrentTime - (TARGET_DELAY * (STARTTARGETS - 1)); con_handler(con) = UNREGISTERED_HANDLER; con_client(con) = cptr; cli_local(cptr) = 1; /* Set certain fields of the struct Client */ cli_since(cptr) = cli_lasttime(cptr) = cli_firsttime(cptr) = CurrentTime; cli_lastnick(cptr) = TStime(); } else con = cli_connect(from); /* use 'from's connection */ assert(0 != con); assert(con_verify(con)); cli_magic(cptr) = CLIENT_MAGIC; cli_connect(cptr) = con; /* set the connection and other fields */ cli_status(cptr) = status; cli_hnext(cptr) = cptr; strcpy(cli_username(cptr), "unknown"); return cptr; }
/* * ms_pong - server message handler * * parv[0] = sender prefix * parv[1] = origin * parv[2] = destination */ int ms_pong(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) { char* origin; char* destination; assert(0 != cptr); assert(0 != sptr); assert(IsServer(cptr)); if (parc < 2 || EmptyString(parv[1])) { return protocol_violation(sptr,"No Origin on PONG"); } origin = parv[1]; destination = parv[2]; ClearPingSent(cptr); ClearPingSent(sptr); cli_lasttime(cptr) = CurrentTime; if (parc > 5) { /* AsLL pong */ cli_serv(cptr)->asll_rtt = atoi(militime_float(parv[3])); cli_serv(cptr)->asll_to = atoi(parv[4]); cli_serv(cptr)->asll_from = atoi(militime_float(parv[5])); cli_serv(cptr)->asll_last = CurrentTime; return 0; } if (EmptyString(destination)) return 0; if (*destination == '!') { /* AsLL ping reply from a non-AsLL server */ cli_serv(cptr)->asll_rtt = atoi(militime_float(destination + 1)); } else if (0 != ircd_strcmp(destination, cli_name(&me))) { struct Client* acptr; if ((acptr = FindClient(destination))) sendcmdto_one(sptr, CMD_PONG, acptr, "%s %s", origin, destination); } return 0; }
static void do_trace(struct Client *cptr, struct Client *sptr, int parc, char *parv[]) { int i; struct Client *acptr; struct Client *acptr2; const struct ConnectionClass* cl; char* tname; int doall; int *link_s; int *link_u; int cnt = 0; int wilds; int dow; if (parc < 2 || BadPtr(parv[1])) { /* just "TRACE" without parameters. Must be from local client */ parc = 1; acptr = &me; tname = cli_name(&me); i = HUNTED_ISME; } else if (parc < 3 || BadPtr(parv[2])) { /* No target specified. Make one before propagating. */ parc = 2; tname = parv[1]; if ((acptr = find_match_server(parv[1])) || ((acptr = FindClient(parv[1])) && !MyUser(acptr))) { if (IsUser(acptr)) parv[2] = cli_name(cli_user(acptr)->server); else parv[2] = cli_name(acptr); parc = 3; parv[3] = 0; if ((i = hunt_server_cmd(sptr, CMD_TRACE, cptr, IsServer(acptr), "%s :%C", 2, parc, parv)) == HUNTED_NOSUCH) return; } else i = HUNTED_ISME; } else { /* Got "TRACE <tname> :<target>" */ parc = 3; if (MyUser(sptr) || Protocol(cptr) < 10) acptr = find_match_server(parv[2]); else acptr = FindNServer(parv[2]); if ((i = hunt_server_cmd(sptr, CMD_TRACE, cptr, 0, "%s :%C", 2, parc, parv)) == HUNTED_NOSUCH) return; tname = parv[1]; } if (i == HUNTED_PASS) { if (!acptr) acptr = next_client(GlobalClientList, tname); else acptr = cli_from(acptr); send_reply(sptr, RPL_TRACELINK, version, debugmode, tname, acptr ? cli_name(cli_from(acptr)) : "<No_match>"); return; } doall = (parv[1] && (parc > 1)) ? !match(tname, cli_name(&me)) : 1; wilds = !parv[1] || strchr(tname, '*') || strchr(tname, '?'); dow = wilds || doall; /* Don't give (long) remote listings to lusers */ if (dow && !MyConnect(sptr) && !IsAnOper(sptr)) { send_reply(sptr, RPL_TRACEEND); return; } link_s = MyCalloc(2 * maxconnections, sizeof(link_s[0])); link_u = link_s + maxconnections; if (doall) { for (acptr = GlobalClientList; acptr; acptr = cli_next(acptr)) { if (IsUser(acptr)) link_u[cli_fd(cli_from(acptr))]++; else if (IsServer(acptr)) link_s[cli_fd(cli_from(acptr))]++; } } /* report all direct connections */ for (i = 0; i <= HighestFd; i++) { const char *conClass; if (!(acptr = LocalClientArray[i])) /* Local Connection? */ continue; if (IsInvisible(acptr) && dow && !(MyConnect(sptr) && IsOper(sptr)) && !IsAnOper(acptr) && (acptr != sptr)) continue; if (!doall && wilds && match(tname, cli_name(acptr))) continue; if (!dow && 0 != ircd_strcmp(tname, cli_name(acptr))) continue; conClass = get_client_class(acptr); switch (cli_status(acptr)) { case STAT_CONNECTING: send_reply(sptr, RPL_TRACECONNECTING, conClass, cli_name(acptr)); cnt++; break; case STAT_HANDSHAKE: send_reply(sptr, RPL_TRACEHANDSHAKE, conClass, cli_name(acptr)); cnt++; break; case STAT_ME: break; case STAT_UNKNOWN: case STAT_UNKNOWN_USER: send_reply(sptr, RPL_TRACEUNKNOWN, conClass, get_client_name(acptr, HIDE_IP)); cnt++; break; case STAT_UNKNOWN_SERVER: send_reply(sptr, RPL_TRACEUNKNOWN, conClass, "Unknown Server"); cnt++; break; case STAT_USER: /* Only opers see users if there is a wildcard but anyone can see all the opers. */ if ((IsAnOper(sptr) && (MyUser(sptr) || !(dow && IsInvisible(acptr)))) || !dow || IsAnOper(acptr)) { if (IsAnOper(acptr)) send_reply(sptr, RPL_TRACEOPERATOR, conClass, get_client_name(acptr, SHOW_IP), CurrentTime - cli_lasttime(acptr)); else send_reply(sptr, RPL_TRACEUSER, conClass, get_client_name(acptr, SHOW_IP), CurrentTime - cli_lasttime(acptr)); cnt++; } break; /* * Connection is a server * * Serv <class> <nS> <nC> <name> <ConnBy> <last> <age> * * class Class the server is in * nS Number of servers reached via this link * nC Number of clients reached via this link * name Name of the server linked * ConnBy Who established this link * last Seconds since we got something from this link * age Seconds this link has been alive * * Additional comments etc...... -Cym-<*****@*****.**> */ case STAT_SERVER: if (cli_serv(acptr)->user) { if (!cli_serv(acptr)->by[0] || !(acptr2 = findNUser(cli_serv(acptr)->by)) || (cli_user(acptr2) != cli_serv(acptr)->user)) acptr2 = NULL; send_reply(sptr, RPL_TRACESERVER, conClass, link_s[i], link_u[i], cli_name(acptr), acptr2 ? cli_name(acptr2) : "*", cli_serv(acptr)->user->username, cli_serv(acptr)->user->host, CurrentTime - cli_lasttime(acptr), CurrentTime - cli_serv(acptr)->timestamp); } else send_reply(sptr, RPL_TRACESERVER, conClass, link_s[i], link_u[i], cli_name(acptr), (*(cli_serv(acptr))->by) ? cli_serv(acptr)->by : "*", "*", cli_name(&me), CurrentTime - cli_lasttime(acptr), CurrentTime - cli_serv(acptr)->timestamp); cnt++; break; default: /* We actually shouldn't come here, -msa */ send_reply(sptr, RPL_TRACENEWTYPE, get_client_name(acptr, HIDE_IP)); cnt++; break; } } /* * Add these lines to summarize the above which can get rather long * and messy when done remotely - Avalon */ if (IsAnOper(sptr) && doall) { for (cl = get_class_list(); cl; cl = cl->next) { if (Links(cl) > 1) send_reply(sptr, RPL_TRACECLASS, ConClass(cl), Links(cl) - 1); } } send_reply(sptr, RPL_TRACEEND); MyFree(link_s); }
/** Run the daemon. * @param[in] argc Number of arguments in \a argv. * @param[in] argv Arguments to program execution. */ int main(int argc, char **argv) { CurrentTime = time(NULL); thisServer.argc = argc; thisServer.argv = argv; thisServer.uid = getuid(); thisServer.euid = geteuid(); #ifdef MDEBUG mem_dbg_initialise(); #endif #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE) set_core_limit(); #endif umask(077); /* better safe than sorry --SRB */ memset(&me, 0, sizeof(me)); memset(&me_con, 0, sizeof(me_con)); cli_connect(&me) = &me_con; cli_fd(&me) = -1; parse_command_line(argc, argv); if (chdir(dpath)) { fprintf(stderr, "Fail: Cannot chdir(%s): %s, check DPATH\n", dpath, strerror(errno)); return 2; } if (!set_userid_if_needed()) return 3; /* Check paths for accessibility */ if (!check_file_access(SPATH, 'S', X_OK) || !check_file_access(configfile, 'C', R_OK)) return 4; if (!init_connection_limits()) return 9; close_connections(!(thisServer.bootopt & (BOOT_DEBUG | BOOT_TTY | BOOT_CHKCONF))); /* daemon_init() must be before event_init() because kqueue() FDs * are, perversely, not inherited across fork(). */ daemon_init(thisServer.bootopt & BOOT_TTY); #ifdef DEBUGMODE /* Must reserve fd 2... */ if (debuglevel >= 0 && !(thisServer.bootopt & BOOT_TTY)) { int fd; if ((fd = open("/dev/null", O_WRONLY)) < 0) { fprintf(stderr, "Unable to open /dev/null (to reserve fd 2): %s\n", strerror(errno)); return 8; } if (fd != 2 && dup2(fd, 2) < 0) { fprintf(stderr, "Unable to reserve fd 2; dup2 said: %s\n", strerror(errno)); return 8; } } #endif event_init(MAXCONNECTIONS); setup_signals(); feature_init(); /* initialize features... */ log_init(*argv); set_nomem_handler(outofmemory); initload(); init_list(); init_hash(); init_class(); initwhowas(); initmsgtree(); initstats(); /* we need this for now, when we're modular this should be removed -- hikari */ ircd_crypt_init(); motd_init(); if (!init_conf()) { log_write(LS_SYSTEM, L_CRIT, 0, "Failed to read configuration file %s", configfile); return 7; } if (thisServer.bootopt & BOOT_CHKCONF) { if (dbg_client) conf_debug_iline(dbg_client); fprintf(stderr, "Configuration file %s checked okay.\n", configfile); return 0; } debug_init(thisServer.bootopt & BOOT_TTY); if (check_pid()) { Debug((DEBUG_FATAL, "Failed to acquire PID file lock after fork")); exit(2); } init_server_identity(); uping_init(); stats_init(); IPcheck_init(); timer_add(timer_init(&connect_timer), try_connections, 0, TT_RELATIVE, 1); timer_add(timer_init(&ping_timer), check_pings, 0, TT_RELATIVE, 1); timer_add(timer_init(&destruct_event_timer), exec_expired_destruct_events, 0, TT_PERIODIC, 60); timer_add(timer_init(&mute_timer), check_expired_mutes, 0, TT_PERIODIC, 30); CurrentTime = time(NULL); SetMe(&me); cli_magic(&me) = CLIENT_MAGIC; cli_from(&me) = &me; make_server(&me); cli_serv(&me)->timestamp = TStime(); /* Abuse own link timestamp as start TS */ cli_serv(&me)->prot = atoi(MAJOR_PROTOCOL); cli_serv(&me)->up = &me; cli_serv(&me)->down = NULL; cli_handler(&me) = SERVER_HANDLER; SetYXXCapacity(&me, MAXCLIENTS); cli_lasttime(&me) = cli_since(&me) = cli_firsttime(&me) = CurrentTime; hAddClient(&me); write_pidfile(); init_counters(); Debug((DEBUG_NOTICE, "Server ready...")); log_write(LS_SYSTEM, L_NOTICE, 0, "Server Ready"); event_loop(); return 0; }
/** Check for clients that have not sent a ping response recently. * Reschedules itself to run again at the appropriate time. * @param[in] ev Timer event (ignored). */ static void check_pings(struct Event* ev) { int expire = 0; int next_check = CurrentTime; int max_ping = 0; int i; assert(ET_EXPIRE == ev_type(ev)); assert(0 != ev_timer(ev)); next_check += feature_int(FEAT_PINGFREQUENCY); /* Scan through the client table */ for (i=0; i <= HighestFd; i++) { struct Client *cptr = LocalClientArray[i]; if (!cptr) continue; assert(&me != cptr); /* I should never be in the local client array! */ /* Remove dead clients. */ if (IsDead(cptr)) { exit_client(cptr, cptr, &me, cli_info(cptr)); continue; } max_ping = IsRegistered(cptr) ? client_get_ping(cptr) : feature_int(FEAT_CONNECTTIMEOUT); Debug((DEBUG_DEBUG, "check_pings(%s)=status:%s limit: %d current: %d", cli_name(cptr), IsPingSent(cptr) ? "[Ping Sent]" : "[]", max_ping, (int)(CurrentTime - cli_lasttime(cptr)))); /* If it's a server and we have not sent an AsLL lately, do so. */ if (IsServer(cptr)) { if (CurrentTime - cli_serv(cptr)->asll_last >= max_ping) { char *asll_ts; SetPingSent(cptr); cli_serv(cptr)->asll_last = CurrentTime; expire = cli_serv(cptr)->asll_last + max_ping; asll_ts = militime_float(NULL); sendcmdto_prio_one(&me, CMD_PING, cptr, "!%s %s %s", asll_ts, cli_name(cptr), asll_ts); } expire = cli_serv(cptr)->asll_last + max_ping; if (expire < next_check) next_check = expire; } /* Ok, the thing that will happen most frequently, is that someone will * have sent something recently. Cover this first for speed. * -- * If it's an unregistered client and hasn't managed to register within * max_ping then it's obviously having problems (broken client) or it's * just up to no good, so we won't skip it, even if its been sending * data to us. * -- hikari */ if ((CurrentTime-cli_lasttime(cptr) < max_ping) && IsRegistered(cptr)) { expire = cli_lasttime(cptr) + max_ping; if (expire < next_check) next_check = expire; continue; } /* Unregistered clients pingout after max_ping seconds, they don't * get given a second chance - if they were then people could not quite * finish registration and hold resources without being subject to k/g * lines */ if (!IsRegistered(cptr)) { assert(!IsServer(cptr)); /* If client authorization time has expired, ask auth whether they * should be checked again later. */ if ((CurrentTime-cli_firsttime(cptr) >= max_ping) && auth_ping_timeout(cptr)) continue; /* OK, they still have enough time left, so we'll just skip to the * next client. Set the next check to be when their time is up, if * that's before the currently scheduled next check -- hikari */ expire = cli_firsttime(cptr) + max_ping; if (expire < next_check) next_check = expire; continue; } /* Quit the client after max_ping*2 - they should have answered by now */ if (CurrentTime-cli_lasttime(cptr) >= (max_ping*2) ) { /* If it was a server, then tell ops about it. */ if (IsServer(cptr) || IsConnecting(cptr) || IsHandshake(cptr)) sendto_opmask_butone(0, SNO_OLDSNO, "No response from %s, closing link", cli_name(cptr)); exit_client_msg(cptr, cptr, &me, "Ping timeout"); continue; } if (!IsPingSent(cptr)) { /* If we haven't PINGed the connection and we haven't heard from it in a * while, PING it to make sure it is still alive. */ SetPingSent(cptr); /* If we're late in noticing don't hold it against them :) */ cli_lasttime(cptr) = CurrentTime - max_ping; if (IsUser(cptr)) sendrawto_one(cptr, MSG_PING " :%s", cli_name(&me)); else sendcmdto_prio_one(&me, CMD_PING, cptr, ":%s", cli_name(&me)); } expire = cli_lasttime(cptr) + max_ping * 2; if (expire < next_check) next_check=expire; } assert(next_check >= CurrentTime); Debug((DEBUG_DEBUG, "[%i] check_pings() again in %is", CurrentTime, next_check-CurrentTime)); timer_add(&ping_timer, check_pings, 0, TT_ABSOLUTE, next_check); }
/** Read a 'packet' of data from a connection and process it. Read in * 8k chunks to give a better performance rating (for server * connections). Do some tricky stuff for client connections to make * sure they don't do any flooding >:-) -avalon * @param cptr Client from which to read data. * @param socket_ready If non-zero, more data can be read from the client's socket. * @return Positive number on success, zero on connection-fatal failure, negative * if user is killed. */ static int read_packet(struct Client *cptr, int socket_ready) { unsigned int dolen = 0; unsigned int length = 0; if (socket_ready && !(IsUser(cptr) && DBufLength(&(cli_recvQ(cptr))) > feature_uint(FEAT_CLIENT_FLOOD))) { #if defined(USE_SSL) switch (client_recv(cptr, readbuf, sizeof(readbuf), &length)) { #else switch (os_recv_nonb(cli_fd(cptr), readbuf, sizeof(readbuf), &length)) { #endif case IO_SUCCESS: if (length) { cli_lasttime(cptr) = CurrentTime; ClearPingSent(cptr); ClrFlag(cptr, FLAG_NONL); if (cli_lasttime(cptr) > cli_since(cptr)) cli_since(cptr) = cli_lasttime(cptr); } break; case IO_BLOCKED: break; case IO_FAILURE: cli_error(cptr) = errno; /* SetFlag(cptr, FLAG_DEADSOCKET); */ return 0; } } /* * For server connections, we process as many as we can without * worrying about the time of day or anything :) */ if (length > 0 && IsServer(cptr)) return server_dopacket(cptr, readbuf, length); else if (length > 0 && (IsHandshake(cptr) || IsConnecting(cptr))) return connect_dopacket(cptr, readbuf, length); else { /* * Before we even think of parsing what we just read, stick * it on the end of the receive queue and do it when its * turn comes around. */ if (length > 0 && dbuf_put(cptr, &(cli_recvQ(cptr)), readbuf, length) == 0) return exit_client(cptr, cptr, &me, "dbuf_put fail"); if ((DBufLength(&(cli_recvQ(cptr))) > feature_uint(FEAT_CLIENT_FLOOD)) && !IsChannelService(cptr)) return exit_client(cptr, cptr, &me, "Excess Flood"); while (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) && (IsTrusted(cptr) || IsChannelService(cptr) || cli_since(cptr) - CurrentTime < 10)) { dolen = dbuf_getmsg(&(cli_recvQ(cptr)), cli_buffer(cptr), BUFSIZE); /* * Devious looking...whats it do ? well..if a client * sends a *long* message without any CR or LF, then * dbuf_getmsg fails and we pull it out using this * loop which just gets the next 512 bytes and then * deletes the rest of the buffer contents. * -avalon */ if (dolen == 0) { if (DBufLength(&(cli_recvQ(cptr))) < 510) SetFlag(cptr, FLAG_NONL); else { /* More than 512 bytes in the line - drop the input and yell * at the client. */ DBufClear(&(cli_recvQ(cptr))); send_reply(cptr, ERR_INPUTTOOLONG); } } else if (client_dopacket(cptr, dolen) == CPTR_KILLED) return CPTR_KILLED; /* * If it has become registered as a Server * then skip the per-message parsing below. */ if (IsHandshake(cptr) || IsServer(cptr)) { while (-1) { dolen = dbuf_get(&(cli_recvQ(cptr)), readbuf, sizeof(readbuf)); if (dolen <= 0) return 1; else if (dolen == 0) { if (DBufLength(&(cli_recvQ(cptr))) < 510) SetFlag(cptr, FLAG_NONL); else { DBufClear(&(cli_recvQ(cptr))); /* send_reply(cptr, ERR_INPUTTOOLONG); */ } } else if ((IsServer(cptr) && server_dopacket(cptr, readbuf, dolen) == CPTR_KILLED) || (!IsServer(cptr) && connect_dopacket(cptr, readbuf, dolen) == CPTR_KILLED)) return CPTR_KILLED; } } } /* If there's still data to process, wait 2 seconds first */ if (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) && !t_onqueue(&(cli_proc(cptr)))) { Debug((DEBUG_LIST, "Adding client process timer for %C", cptr)); cli_freeflag(cptr) |= FREEFLAG_TIMER; timer_add(&(cli_proc(cptr)), client_timer_callback, cli_connect(cptr), TT_RELATIVE, 2); } } return 1; } /** Start a connection to another server. * @param aconf Connect block data for target server. * @param by Client who requested the connection (if any). * @return Non-zero on success; zero on failure. */ int connect_server(struct ConfItem* aconf, struct Client* by) { struct Client* cptr = 0; assert(0 != aconf); if (aconf->dns_pending) { sendto_opmask(0, SNO_OLDSNO, "Server %s connect DNS pending", aconf->name); return 0; } Debug((DEBUG_NOTICE, "Connect to %s[@%s]", aconf->name, ircd_ntoa(&aconf->address.addr))); if ((cptr = FindClient(aconf->name))) { if (IsServer(cptr) || IsMe(cptr)) { sendto_opmask(0, SNO_OLDSNO, "Server %s already present from %s", aconf->name, cli_name(cli_from(cptr))); if (by && IsUser(by) && !MyUser(by)) { sendcmdto_one(&me, CMD_NOTICE, by, "%C :Server %s already present " "from %s", by, aconf->name, cli_name(cli_from(cptr))); } return 0; } else if (IsHandshake(cptr) || IsConnecting(cptr)) { if (by && IsUser(by)) { sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connection to %s already in " "progress", by, cli_name(cptr)); } return 0; } } /* * If we don't know the IP# for this host and it is a hostname and * not a ip# string, then try and find the appropriate host record. */ if (!irc_in_addr_valid(&aconf->address.addr) && !ircd_aton(&aconf->address.addr, aconf->host)) { char buf[HOSTLEN + 1]; host_from_uh(buf, aconf->host, HOSTLEN); gethost_byname(buf, connect_dns_callback, aconf); aconf->dns_pending = 1; return 0; } cptr = make_client(NULL, STAT_UNKNOWN_SERVER); /* * Copy these in so we have something for error detection. */ ircd_strncpy(cli_name(cptr), aconf->name, HOSTLEN); ircd_strncpy(cli_sockhost(cptr), aconf->host, HOSTLEN); /* * Attach config entries to client here rather than in * completed_connection. This to avoid null pointer references */ attach_confs_byhost(cptr, aconf->host, CONF_SERVER); if (!find_conf_byhost(cli_confs(cptr), aconf->host, CONF_SERVER)) { sendto_opmask(0, SNO_OLDSNO, "Host %s is not enabled for " "connecting: no Connect block", aconf->name); if (by && IsUser(by) && !MyUser(by)) { sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connect to host %s failed: no " "Connect block", by, aconf->name); } det_confs_butmask(cptr, 0); free_client(cptr); return 0; } /* * attempt to connect to the server in the conf line */ if (!connect_inet(aconf, cptr)) { if (by && IsUser(by) && !MyUser(by)) { sendcmdto_one(&me, CMD_NOTICE, by, "%C :Couldn't connect to %s", by, cli_name(cptr)); } det_confs_butmask(cptr, 0); free_client(cptr); return 0; } /* * NOTE: if we're here we have a valid C:Line and the client should * have started the connection and stored the remote address/port and * ip address name in itself * * The socket has been connected or connect is in progress. */ make_server(cptr); if (by && IsUser(by)) { ircd_snprintf(0, cli_serv(cptr)->by, sizeof(cli_serv(cptr)->by), "%s%s", NumNick(by)); assert(0 == cli_serv(cptr)->user); cli_serv(cptr)->user = cli_user(by); cli_user(by)->refcnt++; } else { *(cli_serv(cptr))->by = '\0'; /* strcpy(cptr->serv->by, "Auto"); */ } cli_serv(cptr)->up = &me; SetConnecting(cptr); if (cli_fd(cptr) > HighestFd) HighestFd = cli_fd(cptr); LocalClientArray[cli_fd(cptr)] = cptr; Count_newunknown(UserStats); /* Actually we lie, the connect hasn't succeeded yet, but we have a valid * cptr, so we register it now. * Maybe these two calls should be merged. */ add_client_to_list(cptr); hAddClient(cptr); /* nextping = CurrentTime; */ return (s_state(&cli_socket(cptr)) == SS_CONNECTED) ? completed_connection(cptr) : 1; } /** Find the real hostname for the host running the server (or one which * matches the server's name) and its primary IP#. Hostname is stored * in the client structure passed as a pointer. */ void init_server_identity(void) { const struct LocalConf* conf = conf_get_local(); assert(0 != conf); ircd_strncpy(cli_name(&me), conf->name, HOSTLEN); SetYXXServerName(&me, conf->numeric); } /** Process events on a client socket. * @param ev Socket event structure that has a struct Connection as * its associated data. */ static void client_sock_callback(struct Event* ev) { struct Client* cptr; struct Connection* con; char *fmt = "%s"; char *fallback = 0; assert(0 != ev_socket(ev)); assert(0 != s_data(ev_socket(ev))); con = (struct Connection*) s_data(ev_socket(ev)); assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY); cptr = con_client(con); assert(0 == cptr || con == cli_connect(cptr)); switch (ev_type(ev)) { case ET_DESTROY: con_freeflag(con) &= ~FREEFLAG_SOCKET; if (!con_freeflag(con) && !cptr) free_connection(con); #if defined(USE_SSL) ssl_free(ev_socket(ev)); #endif break; case ET_CONNECT: /* socket connection completed */ if (!completed_connection(cptr) || IsDead(cptr)) fallback = cli_info(cptr); break; case ET_ERROR: /* an error occurred */ fallback = cli_info(cptr); cli_error(cptr) = ev_data(ev); /* If the OS told us we have a bad file descriptor, we should * record that for future reference. */ if (cli_error(cptr) == EBADF) cli_fd(cptr) = -1; if (s_state(&(con_socket(con))) == SS_CONNECTING) { completed_connection(cptr); /* for some reason, the os_get_sockerr() in completed_connection() * can return 0 even when ev_data(ev) indicates a real error, so * re-assign the client error here. */ cli_error(cptr) = ev_data(ev); break; } /*FALLTHROUGH*/ case ET_EOF: /* end of file on socket */ Debug((DEBUG_ERROR, "READ ERROR: fd = %d %d", cli_fd(cptr), cli_error(cptr))); SetFlag(cptr, FLAG_DEADSOCKET); if ((IsServer(cptr) || IsHandshake(cptr)) && cli_error(cptr) == 0) { exit_client_msg(cptr, cptr, &me, "Server %s closed the connection (%s)", cli_name(cptr), cli_serv(cptr)->last_error_msg); return; } else { fmt = "Read error: %s"; fallback = "EOF from client"; } break; case ET_WRITE: /* socket is writable */ ClrFlag(cptr, FLAG_BLOCKED); if (cli_listing(cptr) && MsgQLength(&(cli_sendQ(cptr))) < 2048) list_next_channels(cptr); Debug((DEBUG_SEND, "Sending queued data to %C", cptr)); send_queued(cptr); break; case ET_READ: /* socket is readable */ if (!IsDead(cptr)) { Debug((DEBUG_DEBUG, "Reading data from %C", cptr)); if (read_packet(cptr, 1) == 0) /* error while reading packet */ fallback = "EOF from client"; } break; default: assert(0 && "Unrecognized socket event in client_sock_callback()"); break; } assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr)); if (fallback) { const char* msg = (cli_error(cptr)) ? strerror(cli_error(cptr)) : fallback; if (!msg) msg = "Unknown error"; exit_client_msg(cptr, cptr, &me, fmt, msg); } } /** Process a timer on client socket. * @param ev Timer event that has a struct Connection as its * associated data. */ static void client_timer_callback(struct Event* ev) { struct Client* cptr; struct Connection* con; assert(0 != ev_timer(ev)); assert(0 != t_data(ev_timer(ev))); assert(ET_DESTROY == ev_type(ev) || ET_EXPIRE == ev_type(ev)); con = (struct Connection*) t_data(ev_timer(ev)); assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY); cptr = con_client(con); assert(0 == cptr || con == cli_connect(cptr)); if (ev_type(ev)== ET_DESTROY) { con_freeflag(con) &= ~FREEFLAG_TIMER; /* timer has expired... */ if (!con_freeflag(con) && !cptr) free_connection(con); /* client is being destroyed */ } else { Debug((DEBUG_LIST, "Client process timer for %C expired; processing", cptr)); read_packet(cptr, 0); /* read_packet will re-add timer if needed */ } assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr)); }
/** Attempt to send a sequence of bytes to the connection. * As a side effect, updates \a cptr's FLAG_BLOCKED setting * and sendB/sendK fields. * @param cptr Client that should receive data. * @param buf Message buffer to send to client. * @return Negative on connection-fatal error; otherwise * number of bytes sent. */ unsigned int deliver_it(struct Client *cptr, struct MsgQ *buf) { unsigned int bytes_written = 0; unsigned int bytes_count = 0; assert(0 != cptr); #if defined(USE_SSL) switch (client_sendv(cptr, buf, &bytes_count, &bytes_written)) { #else switch (os_sendv_nonb(cli_fd(cptr), buf, &bytes_count, &bytes_written)) { #endif case IO_SUCCESS: ClrFlag(cptr, FLAG_BLOCKED); cli_sendB(cptr) += bytes_written; cli_sendB(&me) += bytes_written; /* A partial write implies that future writes will block. */ if (bytes_written < bytes_count) SetFlag(cptr, FLAG_BLOCKED); break; case IO_BLOCKED: SetFlag(cptr, FLAG_BLOCKED); break; case IO_FAILURE: cli_error(cptr) = errno; SetFlag(cptr, FLAG_DEADSOCKET); break; } return bytes_written; } /** Complete non-blocking connect()-sequence. Check access and * terminate connection, if trouble detected. * @param cptr Client to which we have connected, with all ConfItem structs attached. * @return Zero on failure (caller should exit_client()), non-zero on success. */ static int completed_connection(struct Client* cptr) { struct ConfItem *aconf; time_t newts; struct Client *acptr; int i; #if defined(USE_SSL) char *sslfp; int r; #endif assert(0 != cptr); /* * get the socket status from the fd first to check if * connection actually succeeded */ if ((cli_error(cptr) = os_get_sockerr(cli_fd(cptr)))) { const char* msg = strerror(cli_error(cptr)); if (!msg) msg = "Unknown error"; sendto_opmask(0, SNO_OLDSNO, "Connection failed to %s: %s", cli_name(cptr), msg); return 0; } if (!(aconf = find_conf_byname(cli_confs(cptr), cli_name(cptr), CONF_SERVER))) { sendto_opmask(0, SNO_OLDSNO, "Lost Server Line for %s", cli_name(cptr)); return 0; } #if defined(USE_SSL) if (aconf->flags & CONF_SSL) { r = ssl_connect(&(cli_socket(cptr))); if (r == -1) { sendto_opmask(0, SNO_OLDSNO, "Connection failed to %s: SSL error", cli_name(cptr)); return 0; } else if (r == 0) return 1; sslfp = ssl_get_fingerprint(cli_socket(cptr).s_ssl); if (sslfp) ircd_strncpy(cli_sslclifp(cptr), sslfp, BUFSIZE+1); SetSSL(cptr); } #endif if (s_state(&(cli_socket(cptr))) == SS_CONNECTING) socket_state(&(cli_socket(cptr)), SS_CONNECTED); if (!EmptyString(aconf->passwd)) sendrawto_one(cptr, MSG_PASS " :%s", aconf->passwd); /* * Create a unique timestamp */ newts = TStime(); for (i = HighestFd; i > -1; --i) { if ((acptr = LocalClientArray[i]) && (IsServer(acptr) || IsHandshake(acptr))) { if (cli_serv(acptr)->timestamp >= newts) newts = cli_serv(acptr)->timestamp + 1; } } assert(0 != cli_serv(cptr)); cli_serv(cptr)->timestamp = newts; SetHandshake(cptr); /* * Make us timeout after twice the timeout for DNS look ups */ cli_lasttime(cptr) = CurrentTime; ClearPingSent(cptr); /* TODO: NEGOCIACION envia_config_req(cptr); */ sendrawto_one(cptr, MSG_SERVER " %s 1 %Tu %Tu J%s %s%s +%s6 :%s", cli_name(&me), cli_serv(&me)->timestamp, newts, MAJOR_PROTOCOL, NumServCap(&me), feature_bool(FEAT_HUB) ? "h" : "", cli_info(&me)); #if defined(DDB) ddb_burst(cptr); #endif return (IsDead(cptr)) ? 0 : 1; } /** Close the physical connection. Side effects: MyConnect(cptr) * becomes false and cptr->from becomes NULL. * @param cptr Client to disconnect. */ void close_connection(struct Client *cptr) { struct ConfItem* aconf; if (IsServer(cptr)) { ServerStats->is_sv++; ServerStats->is_sbs += cli_sendB(cptr); ServerStats->is_sbr += cli_receiveB(cptr); ServerStats->is_sti += CurrentTime - cli_firsttime(cptr); /* * If the connection has been up for a long amount of time, schedule * a 'quick' reconnect, else reset the next-connect cycle. */ if ((aconf = find_conf_exact(cli_name(cptr), cptr, CONF_SERVER))) { /* * Reschedule a faster reconnect, if this was a automatically * connected configuration entry. (Note that if we have had * a rehash in between, the status has been changed to * CONF_ILLEGAL). But only do this if it was a "good" link. */ aconf->hold = CurrentTime; aconf->hold += ((aconf->hold - cli_since(cptr) > feature_int(FEAT_HANGONGOODLINK)) ? feature_int(FEAT_HANGONRETRYDELAY) : ConfConFreq(aconf)); /* if (nextconnect > aconf->hold) */ /* nextconnect = aconf->hold; */ } } else if (IsUser(cptr)) { ServerStats->is_cl++; ServerStats->is_cbs += cli_sendB(cptr); ServerStats->is_cbr += cli_receiveB(cptr); ServerStats->is_cti += CurrentTime - cli_firsttime(cptr); } else ServerStats->is_ni++; #if defined(USE_ZLIB) /* * Siempre es una conexion nuestra */ if (cli_connect(cptr)->zlib_negociation & ZLIB_IN) { inflateEnd(cli_connect(cptr)->comp_in); MyFree(cli_connect(cptr)->comp_in); } if (cli_connect(cptr)->zlib_negociation & ZLIB_OUT) { deflateEnd(cli_connect(cptr)->comp_out); MyFree(cli_connect(cptr)->comp_out); } #endif if (-1 < cli_fd(cptr)) { flush_connections(cptr); LocalClientArray[cli_fd(cptr)] = 0; close(cli_fd(cptr)); socket_del(&(cli_socket(cptr))); /* queue a socket delete */ cli_fd(cptr) = -1; cli_freeflag(cptr) &= ~FREEFLAG_SOCKET; } SetFlag(cptr, FLAG_DEADSOCKET); MsgQClear(&(cli_sendQ(cptr))); client_drop_sendq(cli_connect(cptr)); DBufClear(&(cli_recvQ(cptr))); memset(cli_passwd(cptr), 0, sizeof(cli_passwd(cptr))); set_snomask(cptr, 0, SNO_SET); det_confs_butmask(cptr, 0); if (cli_listener(cptr)) { release_listener(cli_listener(cptr)); cli_listener(cptr) = 0; } for ( ; HighestFd > 0; --HighestFd) { if (LocalClientArray[HighestFd]) break; } } /** Close all unregistered connections. * @param source Oper who requested the close. * @return Number of closed connections. */ int net_close_unregistered_connections(struct Client* source) { int i; struct Client* cptr; int count = 0; assert(0 != source); for (i = HighestFd; i > 0; --i) { if ((cptr = LocalClientArray[i]) && !IsRegistered(cptr)) { send_reply(source, RPL_CLOSING, get_client_name(source, HIDE_IP)); exit_client(source, cptr, &me, "Oper Closing"); ++count; } } return count; }
/** Read a 'packet' of data from a connection and process it. Read in * 8k chunks to give a better performance rating (for server * connections). Do some tricky stuff for client connections to make * sure they don't do any flooding >:-) -avalon * @param cptr Client from which to read data. * @param socket_ready If non-zero, more data can be read from the client's socket. * @return Positive number on success, zero on connection-fatal failure, negative * if user is killed. */ static int read_packet(struct Client *cptr, int socket_ready) { unsigned int dolen = 0; unsigned int length = 0; if (socket_ready && !(IsUser(cptr) && !IsOper(cptr) && DBufLength(&(cli_recvQ(cptr))) > feature_int(FEAT_CLIENT_FLOOD))) { switch (os_recv_nonb(cli_fd(cptr), readbuf, sizeof(readbuf), &length)) { case IO_SUCCESS: if (length) { cli_lasttime(cptr) = CurrentTime; ClearPingSent(cptr); ClrFlag(cptr, FLAG_NONL); if (cli_lasttime(cptr) > cli_since(cptr)) cli_since(cptr) = cli_lasttime(cptr); } break; case IO_BLOCKED: break; case IO_FAILURE: cli_error(cptr) = errno; /* SetFlag(cptr, FLAG_DEADSOCKET); */ return 0; } } /* * For server connections, we process as many as we can without * worrying about the time of day or anything :) */ if (length > 0 && IsServer(cptr)) return server_dopacket(cptr, readbuf, length); else if (length > 0 && (IsHandshake(cptr) || IsConnecting(cptr))) return connect_dopacket(cptr, readbuf, length); else { /* * Before we even think of parsing what we just read, stick * it on the end of the receive queue and do it when its * turn comes around. */ if (length > 0 && dbuf_put(&(cli_recvQ(cptr)), readbuf, length) == 0) return exit_client(cptr, cptr, &me, "dbuf_put fail"); if (IsUser(cptr)) { if (DBufLength(&(cli_recvQ(cptr))) > feature_int(FEAT_CLIENT_FLOOD) && !IsOper(cptr)) return exit_client(cptr, cptr, &me, "Excess Flood"); } while (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) && (IsTrusted(cptr) || cli_since(cptr) - CurrentTime < 10)) { dolen = dbuf_getmsg(&(cli_recvQ(cptr)), cli_buffer(cptr), BUFSIZE); /* * Devious looking...whats it do ? well..if a client * sends a *long* message without any CR or LF, then * dbuf_getmsg fails and we pull it out using this * loop which just gets the next 512 bytes and then * deletes the rest of the buffer contents. * -avalon */ if (dolen == 0) { if (DBufLength(&(cli_recvQ(cptr))) < 510) SetFlag(cptr, FLAG_NONL); else { /* More than 512 bytes in the line - drop the input and yell * at the client. */ DBufClear(&(cli_recvQ(cptr))); send_reply(cptr, ERR_INPUTTOOLONG); } } else if (client_dopacket(cptr, dolen) == CPTR_KILLED) return CPTR_KILLED; /* * If it has become registered as a Server * then skip the per-message parsing below. */ if (IsHandshake(cptr) || IsServer(cptr)) { while (-1) { dolen = dbuf_get(&(cli_recvQ(cptr)), readbuf, sizeof(readbuf)); if (dolen <= 0) return 1; else if (dolen == 0) { if (DBufLength(&(cli_recvQ(cptr))) < 510) SetFlag(cptr, FLAG_NONL); else DBufClear(&(cli_recvQ(cptr))); } else if ((IsServer(cptr) && server_dopacket(cptr, readbuf, dolen) == CPTR_KILLED) || (!IsServer(cptr) && connect_dopacket(cptr, readbuf, dolen) == CPTR_KILLED)) return CPTR_KILLED; } } } /* If there's still data to process, wait 2 seconds first */ if (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) && !t_onqueue(&(cli_proc(cptr)))) { Debug((DEBUG_LIST, "Adding client process timer for %C", cptr)); cli_freeflag(cptr) |= FREEFLAG_TIMER; timer_add(&(cli_proc(cptr)), client_timer_callback, cli_connect(cptr), TT_RELATIVE, 2); } } return 1; }