1 |
adx |
30 |
/* |
2 |
|
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* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd). |
3 |
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* listener.c: Listens on a port. |
4 |
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* |
5 |
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* Copyright (C) 2002 by the past and present ircd coders, and others. |
6 |
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* |
7 |
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* This program is free software; you can redistribute it and/or modify |
8 |
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* it under the terms of the GNU General Public License as published by |
9 |
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* the Free Software Foundation; either version 2 of the License, or |
10 |
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* (at your option) any later version. |
11 |
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* |
12 |
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* This program is distributed in the hope that it will be useful, |
13 |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 |
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* GNU General Public License for more details. |
16 |
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* |
17 |
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* You should have received a copy of the GNU General Public License |
18 |
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* along with this program; if not, write to the Free Software |
19 |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
20 |
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* USA |
21 |
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* |
22 |
knight |
31 |
* $Id$ |
23 |
adx |
30 |
*/ |
24 |
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25 |
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#include "stdinc.h" |
26 |
michael |
1011 |
#include "list.h" |
27 |
adx |
30 |
#include "listener.h" |
28 |
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#include "client.h" |
29 |
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#include "fdlist.h" |
30 |
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#include "irc_string.h" |
31 |
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#include "ircd.h" |
32 |
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#include "ircd_defs.h" |
33 |
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#include "s_bsd.h" |
34 |
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#include "numeric.h" |
35 |
michael |
1309 |
#include "conf.h" |
36 |
adx |
30 |
#include "send.h" |
37 |
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#include "memory.h" |
38 |
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|
39 |
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static PF accept_connection; |
40 |
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41 |
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static dlink_list ListenerPollList = { NULL, NULL, 0 }; |
42 |
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static void close_listener(struct Listener *listener); |
43 |
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44 |
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static struct Listener * |
45 |
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make_listener(int port, struct irc_ssaddr *addr) |
46 |
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{ |
47 |
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struct Listener *listener = MyMalloc(sizeof(struct Listener)); |
48 |
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49 |
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listener->port = port; |
50 |
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memcpy(&listener->addr, addr, sizeof(struct irc_ssaddr)); |
51 |
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52 |
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return listener; |
53 |
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} |
54 |
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55 |
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void |
56 |
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free_listener(struct Listener *listener) |
57 |
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{ |
58 |
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assert(listener != NULL); |
59 |
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|
60 |
michael |
1798 |
dlinkDelete(&listener->node, &ListenerPollList); |
61 |
adx |
30 |
MyFree(listener); |
62 |
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} |
63 |
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|
64 |
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/* |
65 |
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* get_listener_name - return displayable listener name and port |
66 |
michael |
1242 |
* returns "host.foo.org/6667" for a given listener |
67 |
adx |
30 |
*/ |
68 |
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const char * |
69 |
michael |
1123 |
get_listener_name(const struct Listener *const listener) |
70 |
adx |
30 |
{ |
71 |
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static char buf[HOSTLEN + HOSTLEN + PORTNAMELEN + 4]; |
72 |
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|
73 |
michael |
1123 |
snprintf(buf, sizeof(buf), "%s[%s/%u]", me.name, |
74 |
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listener->name, listener->port); |
75 |
michael |
900 |
return buf; |
76 |
adx |
30 |
} |
77 |
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|
78 |
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/* show_ports() |
79 |
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* |
80 |
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* inputs - pointer to client to show ports to |
81 |
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* output - none |
82 |
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* side effects - send port listing to a client |
83 |
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*/ |
84 |
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void |
85 |
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show_ports(struct Client *source_p) |
86 |
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{ |
87 |
michael |
900 |
char buf[6]; |
88 |
adx |
30 |
char *p = NULL; |
89 |
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dlink_node *ptr; |
90 |
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91 |
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DLINK_FOREACH(ptr, ListenerPollList.head) |
92 |
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{ |
93 |
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const struct Listener *listener = ptr->data; |
94 |
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p = buf; |
95 |
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96 |
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if (listener->flags & LISTENER_HIDDEN) { |
97 |
michael |
1219 |
if (!HasUMode(source_p, UMODE_ADMIN)) |
98 |
adx |
30 |
continue; |
99 |
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*p++ = 'H'; |
100 |
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} |
101 |
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102 |
michael |
900 |
if (listener->flags & LISTENER_SERVER) |
103 |
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*p++ = 'S'; |
104 |
adx |
30 |
if (listener->flags & LISTENER_SSL) |
105 |
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*p++ = 's'; |
106 |
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*p = '\0'; |
107 |
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sendto_one(source_p, form_str(RPL_STATSPLINE), |
108 |
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me.name, source_p->name, 'P', listener->port, |
109 |
michael |
1219 |
HasUMode(source_p, UMODE_ADMIN) ? listener->name : me.name, |
110 |
adx |
30 |
listener->ref_count, buf, |
111 |
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listener->active ? "active" : "disabled"); |
112 |
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} |
113 |
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} |
114 |
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115 |
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/* |
116 |
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* inetport - create a listener socket in the AF_INET or AF_INET6 domain, |
117 |
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* bind it to the port given in 'port' and listen to it |
118 |
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* returns true (1) if successful false (0) on error. |
119 |
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* |
120 |
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* If the operating system has a define for SOMAXCONN, use it, otherwise |
121 |
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* use HYBRID_SOMAXCONN |
122 |
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*/ |
123 |
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#ifdef SOMAXCONN |
124 |
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#undef HYBRID_SOMAXCONN |
125 |
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#define HYBRID_SOMAXCONN SOMAXCONN |
126 |
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#endif |
127 |
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128 |
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static int |
129 |
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inetport(struct Listener *listener) |
130 |
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{ |
131 |
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struct irc_ssaddr lsin; |
132 |
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socklen_t opt = 1; |
133 |
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|
134 |
michael |
1123 |
memset(&lsin, 0, sizeof(lsin)); |
135 |
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memcpy(&lsin, &listener->addr, sizeof(lsin)); |
136 |
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137 |
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getnameinfo((struct sockaddr *)&lsin, lsin.ss_len, listener->name, |
138 |
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sizeof(listener->name), NULL, 0, NI_NUMERICHOST); |
139 |
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|
140 |
adx |
30 |
/* |
141 |
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* At first, open a new socket |
142 |
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*/ |
143 |
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if (comm_open(&listener->fd, listener->addr.ss.ss_family, SOCK_STREAM, 0, |
144 |
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"Listener socket") == -1) |
145 |
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{ |
146 |
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report_error(L_ALL, "opening listener socket %s:%s", |
147 |
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get_listener_name(listener), errno); |
148 |
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return 0; |
149 |
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} |
150 |
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|
151 |
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if (setsockopt(listener->fd.fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt))) |
152 |
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{ |
153 |
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report_error(L_ALL, "setting SO_REUSEADDR for listener %s:%s", |
154 |
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get_listener_name(listener), errno); |
155 |
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fd_close(&listener->fd); |
156 |
michael |
900 |
return 0; |
157 |
adx |
30 |
} |
158 |
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|
159 |
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/* |
160 |
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* Bind a port to listen for new connections if port is non-null, |
161 |
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* else assume it is already open and try get something from it. |
162 |
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*/ |
163 |
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lsin.ss_port = htons(listener->port); |
164 |
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|
165 |
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if (bind(listener->fd.fd, (struct sockaddr *)&lsin, lsin.ss_len)) |
166 |
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{ |
167 |
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report_error(L_ALL, "binding listener socket %s:%s", |
168 |
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get_listener_name(listener), errno); |
169 |
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fd_close(&listener->fd); |
170 |
michael |
900 |
return 0; |
171 |
adx |
30 |
} |
172 |
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173 |
|
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if (listen(listener->fd.fd, HYBRID_SOMAXCONN)) |
174 |
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{ |
175 |
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report_error(L_ALL, "listen failed for %s:%s", |
176 |
|
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get_listener_name(listener), errno); |
177 |
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fd_close(&listener->fd); |
178 |
michael |
900 |
return 0; |
179 |
adx |
30 |
} |
180 |
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181 |
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/* Listen completion events are READ events .. */ |
182 |
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|
183 |
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accept_connection(&listener->fd, listener); |
184 |
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return 1; |
185 |
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} |
186 |
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|
187 |
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static struct Listener * |
188 |
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find_listener(int port, struct irc_ssaddr *addr) |
189 |
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{ |
190 |
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dlink_node *ptr; |
191 |
|
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struct Listener *listener = NULL; |
192 |
|
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struct Listener *last_closed = NULL; |
193 |
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|
194 |
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DLINK_FOREACH(ptr, ListenerPollList.head) |
195 |
|
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{ |
196 |
|
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listener = ptr->data; |
197 |
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|
198 |
|
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if ((port == listener->port) && |
199 |
|
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(!memcmp(addr, &listener->addr, sizeof(struct irc_ssaddr)))) |
200 |
|
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{ |
201 |
|
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/* Try to return an open listener, otherwise reuse a closed one */ |
202 |
|
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if (!listener->fd.flags.open) |
203 |
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last_closed = listener; |
204 |
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else |
205 |
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return (listener); |
206 |
|
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} |
207 |
|
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} |
208 |
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209 |
|
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return (last_closed); |
210 |
|
|
} |
211 |
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|
212 |
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/* |
213 |
|
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* add_listener- create a new listener |
214 |
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* port - the port number to listen on |
215 |
|
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* vhost_ip - if non-null must contain a valid IP address string in |
216 |
|
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* the format "255.255.255.255" |
217 |
|
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*/ |
218 |
|
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void |
219 |
|
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add_listener(int port, const char *vhost_ip, unsigned int flags) |
220 |
|
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{ |
221 |
|
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struct Listener *listener; |
222 |
|
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struct irc_ssaddr vaddr; |
223 |
|
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struct addrinfo hints, *res; |
224 |
|
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char portname[PORTNAMELEN + 1]; |
225 |
|
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#ifdef IPV6 |
226 |
|
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static short int pass = 0; /* if ipv6 and no address specified we need to |
227 |
|
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have two listeners; one for each protocol. */ |
228 |
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#endif |
229 |
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|
230 |
|
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/* |
231 |
|
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* if no or invalid port in conf line, don't bother |
232 |
|
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*/ |
233 |
|
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if (!(port > 0 && port <= 0xFFFF)) |
234 |
|
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return; |
235 |
|
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|
236 |
|
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memset(&vaddr, 0, sizeof(vaddr)); |
237 |
|
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|
238 |
|
|
/* Set up the hints structure */ |
239 |
|
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memset(&hints, 0, sizeof(hints)); |
240 |
|
|
hints.ai_family = AF_UNSPEC; |
241 |
|
|
hints.ai_socktype = SOCK_STREAM; |
242 |
|
|
/* Get us ready for a bind() and don't bother doing dns lookup */ |
243 |
|
|
hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; |
244 |
|
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|
245 |
|
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#ifdef IPV6 |
246 |
|
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if (ServerInfo.can_use_v6) |
247 |
|
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{ |
248 |
michael |
1123 |
snprintf(portname, sizeof(portname), "%d", port); |
249 |
|
|
getaddrinfo("::", portname, &hints, &res); |
250 |
adx |
30 |
vaddr.ss.ss_family = AF_INET6; |
251 |
|
|
assert(res != NULL); |
252 |
|
|
|
253 |
|
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memcpy((struct sockaddr*)&vaddr, res->ai_addr, res->ai_addrlen); |
254 |
|
|
vaddr.ss_port = port; |
255 |
|
|
vaddr.ss_len = res->ai_addrlen; |
256 |
michael |
1123 |
freeaddrinfo(res); |
257 |
adx |
30 |
} |
258 |
|
|
else |
259 |
|
|
#endif |
260 |
|
|
{ |
261 |
|
|
struct sockaddr_in *v4 = (struct sockaddr_in*) &vaddr; |
262 |
|
|
v4->sin_addr.s_addr = INADDR_ANY; |
263 |
|
|
vaddr.ss.ss_family = AF_INET; |
264 |
|
|
vaddr.ss_len = sizeof(struct sockaddr_in); |
265 |
|
|
v4->sin_port = htons(port); |
266 |
|
|
} |
267 |
|
|
|
268 |
|
|
snprintf(portname, PORTNAMELEN, "%d", port); |
269 |
|
|
|
270 |
michael |
1669 |
if (!EmptyString(vhost_ip)) |
271 |
adx |
30 |
{ |
272 |
michael |
1123 |
if (getaddrinfo(vhost_ip, portname, &hints, &res)) |
273 |
|
|
return; |
274 |
adx |
30 |
|
275 |
|
|
assert(res != NULL); |
276 |
|
|
|
277 |
|
|
memcpy((struct sockaddr*)&vaddr, res->ai_addr, res->ai_addrlen); |
278 |
|
|
vaddr.ss_port = port; |
279 |
|
|
vaddr.ss_len = res->ai_addrlen; |
280 |
michael |
1123 |
freeaddrinfo(res); |
281 |
adx |
30 |
} |
282 |
|
|
#ifdef IPV6 |
283 |
|
|
else if (pass == 0 && ServerInfo.can_use_v6) |
284 |
|
|
{ |
285 |
|
|
/* add the ipv4 listener if we havent already */ |
286 |
|
|
pass = 1; |
287 |
|
|
add_listener(port, "0.0.0.0", flags); |
288 |
|
|
} |
289 |
|
|
pass = 0; |
290 |
|
|
#endif |
291 |
|
|
|
292 |
|
|
if ((listener = find_listener(port, &vaddr))) |
293 |
|
|
{ |
294 |
|
|
listener->flags = flags; |
295 |
|
|
if (listener->fd.flags.open) |
296 |
|
|
return; |
297 |
|
|
} |
298 |
|
|
else |
299 |
|
|
{ |
300 |
|
|
listener = make_listener(port, &vaddr); |
301 |
michael |
1798 |
dlinkAdd(listener, &listener->node, &ListenerPollList); |
302 |
adx |
30 |
listener->flags = flags; |
303 |
|
|
} |
304 |
|
|
|
305 |
|
|
if (inetport(listener)) |
306 |
|
|
listener->active = 1; |
307 |
|
|
else |
308 |
|
|
close_listener(listener); |
309 |
|
|
} |
310 |
|
|
|
311 |
|
|
/* |
312 |
|
|
* close_listener - close a single listener |
313 |
|
|
*/ |
314 |
|
|
static void |
315 |
|
|
close_listener(struct Listener *listener) |
316 |
|
|
{ |
317 |
|
|
assert(listener != NULL); |
318 |
|
|
|
319 |
|
|
if (listener == NULL) |
320 |
|
|
return; |
321 |
|
|
|
322 |
|
|
if (listener->fd.flags.open) |
323 |
|
|
fd_close(&listener->fd); |
324 |
|
|
|
325 |
|
|
listener->active = 0; |
326 |
|
|
|
327 |
|
|
if (listener->ref_count) |
328 |
|
|
return; |
329 |
|
|
|
330 |
|
|
free_listener(listener); |
331 |
|
|
} |
332 |
|
|
|
333 |
|
|
/* |
334 |
|
|
* close_listeners - close and free all listeners that are not being used |
335 |
|
|
*/ |
336 |
|
|
void |
337 |
|
|
close_listeners(void) |
338 |
|
|
{ |
339 |
michael |
1123 |
dlink_node *ptr = NULL, *next_ptr = NULL; |
340 |
adx |
30 |
|
341 |
|
|
/* close all 'extra' listening ports we have */ |
342 |
|
|
DLINK_FOREACH_SAFE(ptr, next_ptr, ListenerPollList.head) |
343 |
|
|
close_listener(ptr->data); |
344 |
|
|
} |
345 |
|
|
|
346 |
|
|
#define TOOFAST_WARNING "ERROR :Trying to reconnect too fast.\r\n" |
347 |
|
|
#define DLINE_WARNING "ERROR :You have been D-lined.\r\n" |
348 |
|
|
|
349 |
|
|
static void |
350 |
|
|
accept_connection(fde_t *pfd, void *data) |
351 |
|
|
{ |
352 |
|
|
static time_t last_oper_notice = 0; |
353 |
|
|
struct irc_ssaddr addr; |
354 |
|
|
int fd; |
355 |
|
|
int pe; |
356 |
|
|
struct Listener *listener = data; |
357 |
|
|
|
358 |
|
|
memset(&addr, 0, sizeof(addr)); |
359 |
|
|
|
360 |
|
|
assert(listener != NULL); |
361 |
|
|
|
362 |
|
|
/* There may be many reasons for error return, but |
363 |
|
|
* in otherwise correctly working environment the |
364 |
|
|
* probable cause is running out of file descriptors |
365 |
|
|
* (EMFILE, ENFILE or others?). The man pages for |
366 |
|
|
* accept don't seem to list these as possible, |
367 |
|
|
* although it's obvious that it may happen here. |
368 |
|
|
* Thus no specific errors are tested at this |
369 |
|
|
* point, just assume that connections cannot |
370 |
|
|
* be accepted until some old is closed first. |
371 |
|
|
*/ |
372 |
michael |
563 |
while ((fd = comm_accept(listener, &addr)) != -1) |
373 |
adx |
30 |
{ |
374 |
|
|
/* |
375 |
|
|
* check for connection limit |
376 |
|
|
*/ |
377 |
|
|
if (number_fd > hard_fdlimit - 10) |
378 |
|
|
{ |
379 |
michael |
896 |
++ServerStats.is_ref; |
380 |
michael |
563 |
|
381 |
adx |
30 |
/* |
382 |
|
|
* slow down the whining to opers bit |
383 |
|
|
*/ |
384 |
|
|
if ((last_oper_notice + 20) <= CurrentTime) |
385 |
|
|
{ |
386 |
michael |
1618 |
sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE, |
387 |
|
|
"All connections in use. (%s)", |
388 |
adx |
30 |
get_listener_name(listener)); |
389 |
|
|
last_oper_notice = CurrentTime; |
390 |
|
|
} |
391 |
|
|
|
392 |
|
|
if (!(listener->flags & LISTENER_SSL)) |
393 |
|
|
send(fd, "ERROR :All connections in use\r\n", 32, 0); |
394 |
michael |
1001 |
|
395 |
adx |
30 |
close(fd); |
396 |
|
|
break; /* jump out and re-register a new io request */ |
397 |
|
|
} |
398 |
|
|
|
399 |
michael |
563 |
/* |
400 |
|
|
* Do an initial check we aren't connecting too fast or with too many |
401 |
|
|
* from this IP... |
402 |
|
|
*/ |
403 |
|
|
if ((pe = conf_connect_allowed(&addr, addr.ss.ss_family)) != 0) |
404 |
adx |
30 |
{ |
405 |
michael |
896 |
++ServerStats.is_ref; |
406 |
|
|
|
407 |
adx |
30 |
if (!(listener->flags & LISTENER_SSL)) |
408 |
|
|
switch (pe) |
409 |
|
|
{ |
410 |
|
|
case BANNED_CLIENT: |
411 |
|
|
send(fd, DLINE_WARNING, sizeof(DLINE_WARNING)-1, 0); |
412 |
|
|
break; |
413 |
|
|
case TOO_FAST: |
414 |
|
|
send(fd, TOOFAST_WARNING, sizeof(TOOFAST_WARNING)-1, 0); |
415 |
|
|
break; |
416 |
|
|
} |
417 |
|
|
|
418 |
|
|
close(fd); |
419 |
|
|
continue; /* drop the one and keep on clearing the queue */ |
420 |
|
|
} |
421 |
|
|
|
422 |
michael |
896 |
++ServerStats.is_ac; |
423 |
michael |
549 |
add_connection(listener, &addr, fd); |
424 |
adx |
30 |
} |
425 |
|
|
|
426 |
|
|
/* Re-register a new IO request for the next accept .. */ |
427 |
|
|
comm_setselect(&listener->fd, COMM_SELECT_READ, accept_connection, |
428 |
|
|
listener, 0); |
429 |
|
|
} |