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189935b1 | 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 |