| 1 |
/* |
| 2 |
* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd). |
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* listener.c: Listens on a port. |
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* |
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* Copyright (C) 2002 by the past and present ircd coders, and others. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
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* USA |
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* |
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* $Id$ |
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*/ |
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|
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#include "stdinc.h" |
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#include "list.h" |
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#include "listener.h" |
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#include "client.h" |
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#include "fdlist.h" |
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#include "irc_string.h" |
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#include "ircd.h" |
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#include "ircd_defs.h" |
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#include "s_bsd.h" |
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#include "numeric.h" |
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#include "conf.h" |
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#include "send.h" |
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#include "memory.h" |
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|
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static PF accept_connection; |
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|
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static dlink_list ListenerPollList = { NULL, NULL, 0 }; |
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static void close_listener(struct Listener *listener); |
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|
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static struct Listener * |
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make_listener(int port, struct irc_ssaddr *addr) |
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{ |
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struct Listener *listener = MyMalloc(sizeof(struct Listener)); |
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|
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listener->port = port; |
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memcpy(&listener->addr, addr, sizeof(struct irc_ssaddr)); |
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|
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return listener; |
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} |
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|
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void |
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free_listener(struct Listener *listener) |
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{ |
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assert(listener != NULL); |
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|
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dlinkDelete(&listener->node, &ListenerPollList); |
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MyFree(listener); |
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} |
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|
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/* |
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* get_listener_name - return displayable listener name and port |
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* returns "host.foo.org/6667" for a given listener |
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*/ |
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const char * |
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get_listener_name(const struct Listener *const listener) |
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{ |
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static char buf[HOSTLEN + HOSTLEN + PORTNAMELEN + 4]; |
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|
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snprintf(buf, sizeof(buf), "%s[%s/%u]", me.name, |
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listener->name, listener->port); |
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return buf; |
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} |
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|
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/* show_ports() |
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* |
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* inputs - pointer to client to show ports to |
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* output - none |
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* side effects - send port listing to a client |
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*/ |
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void |
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show_ports(struct Client *source_p) |
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{ |
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char buf[IRCD_BUFSIZE]; |
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char *p = NULL; |
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dlink_node *ptr; |
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|
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DLINK_FOREACH(ptr, ListenerPollList.head) |
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{ |
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const struct Listener *listener = ptr->data; |
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p = buf; |
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|
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if (listener->flags & LISTENER_HIDDEN) |
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{ |
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if (!HasUMode(source_p, UMODE_ADMIN)) |
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continue; |
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*p++ = 'H'; |
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} |
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|
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if (listener->flags & LISTENER_SERVER) |
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*p++ = 'S'; |
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if (listener->flags & LISTENER_SSL) |
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*p++ = 's'; |
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*p = '\0'; |
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|
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|
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if (HasUMode(source_p, UMODE_ADMIN) && |
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(MyClient(source_p) || !ConfigServerHide.hide_server_ips)) |
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sendto_one(source_p, form_str(RPL_STATSPLINE), |
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me.name, source_p->name, 'P', listener->port, |
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listener->name, |
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listener->ref_count, buf, |
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listener->active ? "active" : "disabled"); |
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else |
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sendto_one(source_p, form_str(RPL_STATSPLINE), |
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me.name, source_p->name, 'P', listener->port, |
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me.name, listener->ref_count, buf, |
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listener->active ? "active" : "disabled"); |
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} |
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} |
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|
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/* |
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* inetport - create a listener socket in the AF_INET or AF_INET6 domain, |
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* bind it to the port given in 'port' and listen to it |
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* returns true (1) if successful false (0) on error. |
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* |
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* If the operating system has a define for SOMAXCONN, use it, otherwise |
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* use HYBRID_SOMAXCONN |
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*/ |
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#ifdef SOMAXCONN |
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#undef HYBRID_SOMAXCONN |
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#define HYBRID_SOMAXCONN SOMAXCONN |
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#endif |
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|
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static int |
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inetport(struct Listener *listener) |
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{ |
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struct irc_ssaddr lsin; |
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socklen_t opt = 1; |
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|
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memset(&lsin, 0, sizeof(lsin)); |
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memcpy(&lsin, &listener->addr, sizeof(lsin)); |
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|
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getnameinfo((struct sockaddr *)&lsin, lsin.ss_len, listener->name, |
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sizeof(listener->name), NULL, 0, NI_NUMERICHOST); |
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|
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/* |
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* At first, open a new socket |
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*/ |
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if (comm_open(&listener->fd, listener->addr.ss.ss_family, SOCK_STREAM, 0, |
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"Listener socket") == -1) |
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{ |
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report_error(L_ALL, "opening listener socket %s:%s", |
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get_listener_name(listener), errno); |
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return 0; |
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} |
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|
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if (setsockopt(listener->fd.fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt))) |
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{ |
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report_error(L_ALL, "setting SO_REUSEADDR for listener %s:%s", |
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get_listener_name(listener), errno); |
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fd_close(&listener->fd); |
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return 0; |
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} |
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|
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/* |
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* Bind a port to listen for new connections if port is non-null, |
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* else assume it is already open and try get something from it. |
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*/ |
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lsin.ss_port = htons(listener->port); |
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|
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if (bind(listener->fd.fd, (struct sockaddr *)&lsin, lsin.ss_len)) |
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{ |
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report_error(L_ALL, "binding listener socket %s:%s", |
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get_listener_name(listener), errno); |
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fd_close(&listener->fd); |
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return 0; |
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} |
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|
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if (listen(listener->fd.fd, HYBRID_SOMAXCONN)) |
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{ |
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report_error(L_ALL, "listen failed for %s:%s", |
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get_listener_name(listener), errno); |
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fd_close(&listener->fd); |
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return 0; |
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} |
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|
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/* Listen completion events are READ events .. */ |
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|
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accept_connection(&listener->fd, listener); |
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return 1; |
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} |
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|
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static struct Listener * |
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find_listener(int port, struct irc_ssaddr *addr) |
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{ |
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dlink_node *ptr; |
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struct Listener *listener = NULL; |
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struct Listener *last_closed = NULL; |
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|
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DLINK_FOREACH(ptr, ListenerPollList.head) |
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{ |
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listener = ptr->data; |
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|
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if ((port == listener->port) && |
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(!memcmp(addr, &listener->addr, sizeof(struct irc_ssaddr)))) |
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{ |
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/* Try to return an open listener, otherwise reuse a closed one */ |
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if (!listener->fd.flags.open) |
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last_closed = listener; |
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else |
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return (listener); |
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} |
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} |
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|
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return (last_closed); |
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} |
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|
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/* |
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* add_listener- create a new listener |
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* port - the port number to listen on |
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* vhost_ip - if non-null must contain a valid IP address string in |
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* the format "255.255.255.255" |
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*/ |
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void |
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add_listener(int port, const char *vhost_ip, unsigned int flags) |
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{ |
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struct Listener *listener; |
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struct irc_ssaddr vaddr; |
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struct addrinfo hints, *res; |
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char portname[PORTNAMELEN + 1]; |
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#ifdef IPV6 |
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static short int pass = 0; /* if ipv6 and no address specified we need to |
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have two listeners; one for each protocol. */ |
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#endif |
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|
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/* |
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* if no or invalid port in conf line, don't bother |
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*/ |
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if (!(port > 0 && port <= 0xFFFF)) |
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return; |
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|
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memset(&vaddr, 0, sizeof(vaddr)); |
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|
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/* Set up the hints structure */ |
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memset(&hints, 0, sizeof(hints)); |
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hints.ai_family = AF_UNSPEC; |
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hints.ai_socktype = SOCK_STREAM; |
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/* Get us ready for a bind() and don't bother doing dns lookup */ |
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hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; |
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|
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#ifdef IPV6 |
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if (ServerInfo.can_use_v6) |
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{ |
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snprintf(portname, sizeof(portname), "%d", port); |
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getaddrinfo("::", portname, &hints, &res); |
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vaddr.ss.ss_family = AF_INET6; |
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assert(res != NULL); |
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|
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memcpy((struct sockaddr*)&vaddr, res->ai_addr, res->ai_addrlen); |
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vaddr.ss_port = port; |
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vaddr.ss_len = res->ai_addrlen; |
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freeaddrinfo(res); |
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} |
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else |
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#endif |
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{ |
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struct sockaddr_in *v4 = (struct sockaddr_in*) &vaddr; |
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v4->sin_addr.s_addr = INADDR_ANY; |
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vaddr.ss.ss_family = AF_INET; |
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vaddr.ss_len = sizeof(struct sockaddr_in); |
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v4->sin_port = htons(port); |
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} |
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|
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snprintf(portname, PORTNAMELEN, "%d", port); |
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|
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if (!EmptyString(vhost_ip)) |
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{ |
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if (getaddrinfo(vhost_ip, portname, &hints, &res)) |
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return; |
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|
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assert(res != NULL); |
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|
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memcpy((struct sockaddr*)&vaddr, res->ai_addr, res->ai_addrlen); |
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vaddr.ss_port = port; |
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vaddr.ss_len = res->ai_addrlen; |
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freeaddrinfo(res); |
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} |
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#ifdef IPV6 |
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else if (pass == 0 && ServerInfo.can_use_v6) |
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{ |
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/* add the ipv4 listener if we havent already */ |
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pass = 1; |
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add_listener(port, "0.0.0.0", flags); |
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} |
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pass = 0; |
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#endif |
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|
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if ((listener = find_listener(port, &vaddr))) |
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{ |
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listener->flags = flags; |
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if (listener->fd.flags.open) |
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return; |
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} |
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else |
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{ |
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listener = make_listener(port, &vaddr); |
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dlinkAdd(listener, &listener->node, &ListenerPollList); |
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listener->flags = flags; |
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} |
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|
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if (inetport(listener)) |
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listener->active = 1; |
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else |
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close_listener(listener); |
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} |
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|
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/* |
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* close_listener - close a single listener |
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*/ |
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static void |
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close_listener(struct Listener *listener) |
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{ |
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assert(listener != NULL); |
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|
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if (listener == NULL) |
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return; |
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|
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if (listener->fd.flags.open) |
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fd_close(&listener->fd); |
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|
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listener->active = 0; |
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|
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if (listener->ref_count) |
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return; |
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|
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free_listener(listener); |
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} |
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|
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/* |
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* close_listeners - close and free all listeners that are not being used |
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*/ |
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void |
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close_listeners(void) |
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{ |
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dlink_node *ptr = NULL, *next_ptr = NULL; |
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|
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/* close all 'extra' listening ports we have */ |
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DLINK_FOREACH_SAFE(ptr, next_ptr, ListenerPollList.head) |
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close_listener(ptr->data); |
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} |
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|
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#define TOOFAST_WARNING "ERROR :Trying to reconnect too fast.\r\n" |
| 357 |
#define DLINE_WARNING "ERROR :You have been D-lined.\r\n" |
| 358 |
|
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static void |
| 360 |
accept_connection(fde_t *pfd, void *data) |
| 361 |
{ |
| 362 |
static time_t last_oper_notice = 0; |
| 363 |
struct irc_ssaddr addr; |
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int fd; |
| 365 |
int pe; |
| 366 |
struct Listener *listener = data; |
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|
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memset(&addr, 0, sizeof(addr)); |
| 369 |
|
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assert(listener != NULL); |
| 371 |
|
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/* There may be many reasons for error return, but |
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* in otherwise correctly working environment the |
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* probable cause is running out of file descriptors |
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* (EMFILE, ENFILE or others?). The man pages for |
| 376 |
* accept don't seem to list these as possible, |
| 377 |
* although it's obvious that it may happen here. |
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* Thus no specific errors are tested at this |
| 379 |
* point, just assume that connections cannot |
| 380 |
* be accepted until some old is closed first. |
| 381 |
*/ |
| 382 |
while ((fd = comm_accept(listener, &addr)) != -1) |
| 383 |
{ |
| 384 |
/* |
| 385 |
* check for connection limit |
| 386 |
*/ |
| 387 |
if (number_fd > hard_fdlimit - 10) |
| 388 |
{ |
| 389 |
++ServerStats.is_ref; |
| 390 |
|
| 391 |
/* |
| 392 |
* slow down the whining to opers bit |
| 393 |
*/ |
| 394 |
if ((last_oper_notice + 20) <= CurrentTime) |
| 395 |
{ |
| 396 |
sendto_realops_flags(UMODE_ALL, L_ALL, SEND_NOTICE, |
| 397 |
"All connections in use. (%s)", |
| 398 |
get_listener_name(listener)); |
| 399 |
last_oper_notice = CurrentTime; |
| 400 |
} |
| 401 |
|
| 402 |
if (!(listener->flags & LISTENER_SSL)) |
| 403 |
send(fd, "ERROR :All connections in use\r\n", 32, 0); |
| 404 |
|
| 405 |
close(fd); |
| 406 |
break; /* jump out and re-register a new io request */ |
| 407 |
} |
| 408 |
|
| 409 |
/* |
| 410 |
* Do an initial check we aren't connecting too fast or with too many |
| 411 |
* from this IP... |
| 412 |
*/ |
| 413 |
if ((pe = conf_connect_allowed(&addr, addr.ss.ss_family)) != 0) |
| 414 |
{ |
| 415 |
++ServerStats.is_ref; |
| 416 |
|
| 417 |
if (!(listener->flags & LISTENER_SSL)) |
| 418 |
switch (pe) |
| 419 |
{ |
| 420 |
case BANNED_CLIENT: |
| 421 |
send(fd, DLINE_WARNING, sizeof(DLINE_WARNING)-1, 0); |
| 422 |
break; |
| 423 |
case TOO_FAST: |
| 424 |
send(fd, TOOFAST_WARNING, sizeof(TOOFAST_WARNING)-1, 0); |
| 425 |
break; |
| 426 |
} |
| 427 |
|
| 428 |
close(fd); |
| 429 |
continue; /* drop the one and keep on clearing the queue */ |
| 430 |
} |
| 431 |
|
| 432 |
++ServerStats.is_ac; |
| 433 |
add_connection(listener, &addr, fd); |
| 434 |
} |
| 435 |
|
| 436 |
/* Re-register a new IO request for the next accept .. */ |
| 437 |
comm_setselect(&listener->fd, COMM_SELECT_READ, accept_connection, |
| 438 |
listener, 0); |
| 439 |
} |
