547 lines
16 KiB
C
547 lines
16 KiB
C
/*
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* ircd-ratbox: A slightly useful ircd.
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* listener.c: Listens on a port.
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*
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* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
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* Copyright (C) 1996-2002 Hybrid Development Team
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* Copyright (C) 2002-2005 ircd-ratbox development team
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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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*/
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#include "stdinc.h"
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#include "setup.h"
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#include "listener.h"
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#include "client.h"
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#include "match.h"
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#include "ircd.h"
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#include "ircd_defs.h"
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#include "numeric.h"
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#include "s_conf.h"
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#include "s_newconf.h"
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#include "s_stats.h"
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#include "send.h"
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#include "s_auth.h"
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#include "reject.h"
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#include "s_conf.h"
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#include "hostmask.h"
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#include "sslproc.h"
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#include "hash.h"
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#ifndef INADDR_NONE
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#define INADDR_NONE ((unsigned int) 0xffffffff)
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#endif
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#if defined(NO_IN6ADDR_ANY) && defined(RB_IPV6)
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static const struct in6_addr in6addr_any =
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{ { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } };
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#endif
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static struct Listener *ListenerPollList = NULL;
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static int accept_precallback(rb_fde_t *F, struct sockaddr *addr, rb_socklen_t addrlen, void *data);
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static void accept_callback(rb_fde_t *F, int status, struct sockaddr *addr, rb_socklen_t addrlen, void *data);
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static struct Listener *
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make_listener(struct rb_sockaddr_storage *addr)
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{
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struct Listener *listener = (struct Listener *) rb_malloc(sizeof(struct Listener));
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s_assert(0 != listener);
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listener->name = me.name;
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listener->F = NULL;
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memcpy(&listener->addr, addr, sizeof(struct rb_sockaddr_storage));
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listener->next = NULL;
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return listener;
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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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s_assert(NULL != listener);
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if(listener == NULL)
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return;
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/*
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* remove from listener list
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*/
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if(listener == ListenerPollList)
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ListenerPollList = listener->next;
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else {
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struct Listener *prev = ListenerPollList;
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for (; prev; prev = prev->next) {
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if(listener == prev->next) {
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prev->next = listener->next;
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break;
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}
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}
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}
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/* free */
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rb_free(listener);
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}
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#define PORTNAMELEN 6 /* ":31337" */
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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 *listener)
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{
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static char buf[HOSTLEN + HOSTLEN + PORTNAMELEN + 4];
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int port = 0;
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s_assert(NULL != listener);
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if(listener == NULL)
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return NULL;
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#ifdef RB_IPV6
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if(listener->addr.ss_family == AF_INET6)
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port = ntohs(((const struct sockaddr_in6 *)&listener->addr)->sin6_port);
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else
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#endif
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port = ntohs(((const struct sockaddr_in *)&listener->addr)->sin_port);
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snprintf(buf, sizeof(buf), "%s[%s/%u]", me.name, listener->name, port);
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return buf;
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}
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/*
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* show_ports - send port listing to a client
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* inputs - pointer to client to show ports to
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* output - none
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* side effects - show ports
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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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struct Listener *listener = 0;
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for (listener = ListenerPollList; listener; listener = listener->next) {
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sendto_one_numeric(source_p, RPL_STATSPLINE,
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form_str(RPL_STATSPLINE), 'P',
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#ifdef RB_IPV6
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ntohs(listener->addr.ss_family == AF_INET ? ((struct sockaddr_in *)&listener->addr)->sin_port :
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((struct sockaddr_in6 *)&listener->addr)->sin6_port),
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#else
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ntohs(((struct sockaddr_in *)&listener->addr)->sin_port),
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#endif
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IsOperAdmin(source_p) ? listener->name : me.name,
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listener->ref_count, (listener->active) ? "active" : "disabled",
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listener->ssl ? " ssl" : "");
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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 RATBOX_SOMAXCONN
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*/
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#ifdef SOMAXCONN
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#undef RATBOX_SOMAXCONN
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#define RATBOX_SOMAXCONN SOMAXCONN
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#endif
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static int
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inetport(struct Listener *listener)
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{
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rb_fde_t *F;
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int opt = 1;
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/*
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* At first, open a new socket
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*/
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F = rb_socket(GET_SS_FAMILY(&listener->addr), SOCK_STREAM, 0, "Listener socket");
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#ifdef RB_IPV6
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if(listener->addr.ss_family == AF_INET6) {
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struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&listener->addr;
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if(!IN6_ARE_ADDR_EQUAL(&in6->sin6_addr, &in6addr_any)) {
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rb_inet_ntop(AF_INET6, &in6->sin6_addr, listener->vhost, sizeof(listener->vhost));
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listener->name = listener->vhost;
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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 *in = (struct sockaddr_in *)&listener->addr;
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if(in->sin_addr.s_addr != INADDR_ANY) {
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rb_inet_ntop(AF_INET, &in->sin_addr, listener->vhost, sizeof(listener->vhost));
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listener->name = listener->vhost;
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}
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}
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if(F == NULL) {
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ilog_error("opening listener socket");
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return 0;
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} else if((maxconnections - 10) < rb_get_fd(F)) { /* XXX this is kinda bogus*/
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ilog_error("no more connections left for listener");
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rb_close(F);
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return 0;
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}
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/*
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* XXX - we don't want to do all this crap for a listener
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* set_sock_opts(listener);
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*/
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if(setsockopt(rb_get_fd(F), SOL_SOCKET, SO_REUSEADDR, (char *) &opt, sizeof(opt))) {
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ilog_error("setting SO_REUSEADDR for listener");
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rb_close(F);
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return 0;
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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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if(bind(rb_get_fd(F), (struct sockaddr *) &listener->addr, GET_SS_LEN(&listener->addr))) {
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ilog_error("binding listener socket");
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rb_close(F);
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return 0;
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}
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if(rb_listen(F, RATBOX_SOMAXCONN, listener->defer_accept)) {
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ilog_error("listen()");
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rb_close(F);
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return 0;
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}
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listener->F = F;
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rb_accept_tcp(listener->F, accept_precallback, accept_callback, listener);
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return 1;
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}
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static struct Listener *
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find_listener(struct rb_sockaddr_storage *addr)
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{
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struct Listener *listener = NULL;
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struct Listener *last_closed = NULL;
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for (listener = ListenerPollList; listener; listener = listener->next) {
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if(addr->ss_family != listener->addr.ss_family)
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continue;
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switch(addr->ss_family) {
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case AF_INET: {
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struct sockaddr_in *in4 = (struct sockaddr_in *)addr;
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struct sockaddr_in *lin4 = (struct sockaddr_in *)&listener->addr;
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if(in4->sin_addr.s_addr == lin4->sin_addr.s_addr &&
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in4->sin_port == lin4->sin_port ) {
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if(listener->F == NULL)
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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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break;
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}
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#ifdef RB_IPV6
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case AF_INET6: {
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struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)addr;
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struct sockaddr_in6 *lin6 =(struct sockaddr_in6 *)&listener->addr;
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if(IN6_ARE_ADDR_EQUAL(&in6->sin6_addr, &lin6->sin6_addr) &&
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in6->sin6_port == lin6->sin6_port) {
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if(listener->F == NULL)
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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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break;
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}
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#endif
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default:
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break;
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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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* 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, int family, int ssl, int defer_accept)
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{
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struct Listener *listener;
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struct rb_sockaddr_storage vaddr;
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/*
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* if no port in conf line, don't bother
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*/
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if(port == 0)
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return;
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memset(&vaddr, 0, sizeof(vaddr));
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vaddr.ss_family = family;
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if(vhost_ip != NULL) {
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if(family == AF_INET) {
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if(rb_inet_pton(family, vhost_ip, &((struct sockaddr_in *)&vaddr)->sin_addr) <= 0)
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return;
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}
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#ifdef RB_IPV6
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else {
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if(rb_inet_pton(family, vhost_ip, &((struct sockaddr_in6 *)&vaddr)->sin6_addr) <= 0)
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return;
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}
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#endif
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} else {
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switch(family) {
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case AF_INET:
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((struct sockaddr_in *)&vaddr)->sin_addr.s_addr = INADDR_ANY;
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break;
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#ifdef RB_IPV6
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case AF_INET6:
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memcpy(&((struct sockaddr_in6 *)&vaddr)->sin6_addr, &in6addr_any, sizeof(struct in6_addr));
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break;
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default:
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return;
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#endif
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}
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}
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switch(family) {
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case AF_INET:
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SET_SS_LEN(&vaddr, sizeof(struct sockaddr_in));
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((struct sockaddr_in *)&vaddr)->sin_port = htons(port);
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break;
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#ifdef RB_IPV6
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case AF_INET6:
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SET_SS_LEN(&vaddr, sizeof(struct sockaddr_in6));
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((struct sockaddr_in6 *)&vaddr)->sin6_port = htons(port);
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break;
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#endif
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default:
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break;
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}
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if((listener = find_listener(&vaddr))) {
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if(listener->F != NULL)
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return;
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} else {
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listener = make_listener(&vaddr);
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listener->next = ListenerPollList;
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ListenerPollList = listener;
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}
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listener->F = NULL;
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listener->ssl = ssl;
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listener->defer_accept = defer_accept;
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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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* close_listener - close a single listener
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*/
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void
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close_listener(struct Listener *listener)
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{
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s_assert(listener != NULL);
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if(listener == NULL)
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return;
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if(listener->F != NULL) {
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rb_close(listener->F);
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listener->F = NULL;
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}
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listener->active = 0;
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if(listener->ref_count)
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return;
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free_listener(listener);
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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()
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{
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struct Listener *listener;
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struct Listener *listener_next = 0;
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/*
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* close all 'extra' listening ports we have
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*/
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for (listener = ListenerPollList; listener; listener = listener_next) {
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listener_next = listener->next;
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close_listener(listener);
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}
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}
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#define DLINE_WARNING "ERROR :You have been D-lined.\r\n"
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/*
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* add_connection - creates a client which has just connected to us on
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* the given fd. The sockhost field is initialized with the ip# of the host.
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* The client is sent to the auth module for verification, and not put in
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* any client list yet.
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*/
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static void
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add_connection(struct Listener *listener, rb_fde_t *F, struct sockaddr *sai, struct sockaddr *lai, void *ssl_ctl)
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{
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struct Client *new_client;
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s_assert(NULL != listener);
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/*
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* get the client socket name from the socket
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* the client has already been checked out in accept_connection
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*/
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new_client = make_client(NULL);
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memcpy(&new_client->localClient->ip, sai, sizeof(struct rb_sockaddr_storage));
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memcpy(&new_client->preClient->lip, lai, sizeof(struct rb_sockaddr_storage));
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/*
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* copy address to 'sockhost' as a string, copy it to host too
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* so we have something valid to put into error messages...
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*/
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rb_inet_ntop_sock((struct sockaddr *)&new_client->localClient->ip, new_client->sockhost,
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sizeof(new_client->sockhost));
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rb_strlcpy(new_client->host, new_client->sockhost, sizeof(new_client->host));
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new_client->localClient->F = F;
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add_to_cli_fd_hash(new_client);
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new_client->localClient->listener = listener;
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new_client->localClient->ssl_ctl = ssl_ctl;
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if(ssl_ctl != NULL || rb_fd_ssl(F))
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SetSSL(new_client);
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++listener->ref_count;
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start_auth(new_client);
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}
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static const char *toofast = "ERROR :Reconnecting too fast, throttled.\r\n";
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static int
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accept_precallback(rb_fde_t *F, struct sockaddr *addr, rb_socklen_t addrlen, void *data)
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{
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struct Listener *listener = (struct Listener *)data;
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char buf[BUFSIZE];
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struct ConfItem *aconf;
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static time_t last_oper_notice = 0;
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int len;
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if(listener->ssl && (!ssl_ok || !get_ssld_count())) {
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rb_close(F);
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return 0;
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}
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if((maxconnections - 10) < rb_get_fd(F)) { /* XXX this is kinda bogus */
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++ServerStats.is_ref;
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/*
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* slow down the whining to opers bit
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*/
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if((last_oper_notice + 20) <= rb_current_time()) {
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"All connections in use. (%s)",
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get_listener_name(listener));
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last_oper_notice = rb_current_time();
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}
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rb_write(F, "ERROR :All connections in use\r\n", 32);
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rb_close(F);
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/* Re-register a new IO request for the next accept .. */
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return 0;
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}
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aconf = find_dline(addr, addr->sa_family);
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if(aconf != NULL && (aconf->status & CONF_EXEMPTDLINE))
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return 1;
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/* Do an initial check we aren't connecting too fast or with too many
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* from this IP... */
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if(aconf != NULL) {
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ServerStats.is_ref++;
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if(ConfigFileEntry.dline_with_reason) {
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len = snprintf(buf, sizeof(buf), "ERROR :*** Banned: %s\r\n", get_user_ban_reason(aconf));
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if (len >= (int)(sizeof(buf)-1)) {
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buf[sizeof(buf) - 3] = '\r';
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buf[sizeof(buf) - 2] = '\n';
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buf[sizeof(buf) - 1] = '\0';
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}
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} else
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strcpy(buf, "ERROR :You have been D-lined.\r\n");
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rb_write(F, buf, strlen(buf));
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rb_close(F);
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return 0;
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}
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if(check_reject(F, addr))
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return 0;
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if(throttle_add(addr)) {
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rb_write(F, toofast, strlen(toofast));
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rb_close(F);
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return 0;
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}
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return 1;
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}
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static void
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accept_ssld(rb_fde_t *F, struct sockaddr *addr, struct sockaddr *laddr, struct Listener *listener)
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{
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ssl_ctl_t *ctl;
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rb_fde_t *xF[2];
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if(rb_socketpair(AF_UNIX, SOCK_STREAM, 0, &xF[0], &xF[1], "Incoming ssld Connection") == -1) {
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ilog_error("creating SSL/TLS socket pairs");
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rb_close(F);
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return;
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}
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ctl = start_ssld_accept(F, xF[1], rb_get_fd(xF[0])); /* this will close F for us */
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add_connection(listener, xF[0], addr, laddr, ctl);
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}
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|
|
|
static void
|
|
accept_callback(rb_fde_t *F, int status, struct sockaddr *addr, rb_socklen_t addrlen, void *data)
|
|
{
|
|
struct Listener *listener = data;
|
|
struct rb_sockaddr_storage lip;
|
|
unsigned int locallen = sizeof(struct rb_sockaddr_storage);
|
|
|
|
ServerStats.is_ac++;
|
|
|
|
if(getsockname(rb_get_fd(F), (struct sockaddr *) &lip, &locallen) < 0) {
|
|
/* this can fail if the connection disappeared in the meantime */
|
|
rb_close(F);
|
|
return;
|
|
}
|
|
|
|
if(listener->ssl)
|
|
accept_ssld(F, addr, (struct sockaddr *)&lip, listener);
|
|
else
|
|
add_connection(listener, F, addr, (struct sockaddr *)&lip, NULL);
|
|
}
|