/*
* IRC - Internet Relay Chat, ircd/s_bsd.c
* Copyright (C) 1990 Jarkko Oikarinen and
* University of Oulu, Computing Center
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 1, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: s_bsd.c,v 1.45.2.13 2003/11/01 10:19:12 isomer Exp $
*/
#include "config.h"
#include "s_bsd.h"
#include "client.h"
#include "IPcheck.h"
#include "channel.h"
#include "class.h"
#include "hash.h"
#include "ircd_log.h"
#include "ircd_features.h"
#include "ircd_osdep.h"
#include "ircd_reply.h"
#include "ircd_snprintf.h"
#include "ircd_string.h"
#include "ircd.h"
#include "list.h"
#include "listener.h"
#include "msg.h"
#include "msgq.h"
#include "numeric.h"
#include "numnicks.h"
#include "packet.h"
#include "parse.h"
#include "querycmds.h"
#include "res.h"
#include "s_auth.h"
#include "s_conf.h"
#include "s_debug.h"
#include "s_misc.h"
#include "s_user.h"
#include "send.h"
#include "struct.h"
#include "support.h"
#include "sys.h"
#include "uping.h"
#include "version.h"
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/utsname.h>
#include <unistd.h>
#ifdef USE_POLL
#include <sys/poll.h>
#endif /* USE_POLL */
#ifndef INADDR_NONE
#define INADDR_NONE 0xffffffff
#endif
struct Client* LocalClientArray[MAXCONNECTIONS];
int HighestFd = -1;
struct sockaddr_in VirtualHost;
static char readbuf[SERVER_TCP_WINDOW];
/*
* report_error text constants
*/
const char* const ACCEPT_ERROR_MSG = "error accepting connection for %s: %s";
const char* const BIND_ERROR_MSG = "bind error for %s: %s";
const char* const CONNECT_ERROR_MSG = "connect to host %s failed: %s";
const char* const CONNLIMIT_ERROR_MSG = "connect limit exceeded for %s: %s";
const char* const LISTEN_ERROR_MSG = "listen error for %s: %s";
const char* const NONB_ERROR_MSG = "error setting non-blocking for %s: %s";
const char* const PEERNAME_ERROR_MSG = "getpeername failed for %s: %s";
const char* const POLL_ERROR_MSG = "poll error for %s: %s";
const char* const REGISTER_ERROR_MSG = "registering %s: %s";
const char* const REUSEADDR_ERROR_MSG = "error setting SO_REUSEADDR for %s: %s";
const char* const SELECT_ERROR_MSG = "select error for %s: %s";
const char* const SETBUFS_ERROR_MSG = "error setting buffer size for %s: %s";
const char* const SOCKET_ERROR_MSG = "error creating socket for %s: %s";
const char* const TOS_ERROR_MSG = "error setting TOS for %s: %s";
static void client_sock_callback(struct Event* ev);
static void client_timer_callback(struct Event* ev);
#if !defined(USE_POLL)
#if FD_SETSIZE < (MAXCONNECTIONS + 4)
/*
* Sanity check
*
* All operating systems work when MAXCONNECTIONS <= 252.
* Most operating systems work when MAXCONNECTIONS <= 1020 and FD_SETSIZE is
* updated correctly in the system headers (on BSD systems our sys.h has
* defined FD_SETSIZE to MAXCONNECTIONS+4 before including the system's headers
* but sys/types.h might have abruptly redefined it so the check is still
* done), you might already need to recompile your kernel.
* For larger FD_SETSIZE your milage may vary (kernel patches may be needed).
* The check is _NOT_ done if we will not use FD_SETS at all (USE_POLL)
*/
#error "FD_SETSIZE is too small or MAXCONNECTIONS too large."
#endif
#endif
/*
* Cannot use perror() within daemon. stderr is closed in
* ircd and cannot be used. And, worse yet, it might have
* been reassigned to a normal connection...
*/
/*
* report_error
*
* This a replacement for perror(). Record error to log and
* also send a copy to all *LOCAL* opers online.
*
* text is a *format* string for outputting error. It must
* contain only two '%s', the first will be replaced
* by the sockhost from the cptr, and the latter will
* be taken from sys_errlist[errno].
*
* cptr if not NULL, is the *LOCAL* client associated with
* the error.
*/
void report_error(const char* text, const char* who, int err)
{
static time_t last_notice = 0;
int errtmp = errno; /* debug may change 'errno' */
const char* errmsg = (err) ? strerror(err) : "";
if (!errmsg)
errmsg = "Unknown error";
if (EmptyString(who))
who = "unknown";
if (last_notice + 20 < CurrentTime) {
/*
* pace error messages so opers don't get flooded by transients
*/
sendto_opmask_butone(0, SNO_OLDSNO, text, who, errmsg);
last_notice = CurrentTime;
}
log_write(LS_SOCKET, L_ERROR, 0, text, who, errmsg);
errno = errtmp;
}
/*
* connect_dns_callback - called when resolver query finishes
* if the query resulted in a successful search, reply will contain
* a non-null pointer, otherwise reply will be null.
* if successful start the connection, otherwise notify opers
*/
static void connect_dns_callback(void* vptr, struct DNSReply* reply)
{
struct ConfItem* aconf = (struct ConfItem*) vptr;
aconf->dns_pending = 0;
if (reply) {
memcpy(&aconf->ipnum, reply->hp->h_addr, sizeof(struct in_addr));
connect_server(aconf, 0, reply);
}
else
sendto_opmask_butone(0, SNO_OLDSNO, "Connect to %s failed: host lookup",
aconf->name);
}
/*
* close_connections - closes all connections
* close stderr if specified
*/
void close_connections(int close_stderr)
{
int i;
close(0);
close(1);
if (close_stderr)
close(2);
for (i = 3; i < MAXCONNECTIONS; ++i)
close(i);
}
/*
* init_connection_limits - initialize process fd limit to
* MAXCONNECTIONS
*/
int init_connection_limits(void)
{
int limit = os_set_fdlimit(MAXCONNECTIONS);
if (0 == limit)
return 1;
if (limit < 0) {
fprintf(stderr, "error setting max fd's to %d\n", limit);
}
else if (limit > 0) {
fprintf(stderr, "ircd fd table too big\nHard Limit: %d IRC max: %d\n",
limit, MAXCONNECTIONS);
fprintf(stderr, "set MAXCONNECTIONS to a smaller value");
}
return 0;
}
/*
* connect_inet - set up address and port and make a connection
*/
static int connect_inet(struct ConfItem* aconf, struct Client* cptr)
{
static struct sockaddr_in sin;
IOResult result;
assert(0 != aconf);
assert(0 != cptr);
/*
* Might as well get sockhost from here, the connection is attempted
* with it so if it fails its useless.
*/
cli_fd(cptr) = socket(AF_INET, SOCK_STREAM, 0);
if (-1 == cli_fd(cptr)) {
cli_error(cptr) = errno;
report_error(SOCKET_ERROR_MSG, cli_name(cptr), errno);
return 0;
}
if (cli_fd(cptr) >= MAXCLIENTS) {
report_error(CONNLIMIT_ERROR_MSG, cli_name(cptr), 0);
close(cli_fd(cptr));
cli_fd(cptr) = -1;
return 0;
}
/*
* Bind to a local IP# (with unknown port - let unix decide) so
* we have some chance of knowing the IP# that gets used for a host
* with more than one IP#.
*
* No we don't bind it, not all OS's can handle connecting with
* an already bound socket, different ip# might occur anyway
* leading to a freezing select() on this side for some time.
* I had this on my Linux 1.1.88 --Run
*/
/*
* No, we do bind it if we have virtual host support. If we don't
* explicitly bind it, it will default to IN_ADDR_ANY and we lose
* due to the other server not allowing our base IP --smg
*/
if (feature_bool(FEAT_VIRTUAL_HOST) &&
bind(cli_fd(cptr), (struct sockaddr*) &VirtualHost,
sizeof(VirtualHost))) {
report_error(BIND_ERROR_MSG, cli_name(cptr), errno);
close(cli_fd(cptr));
cli_fd(cptr) = -1;
return 0;
}
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = aconf->ipnum.s_addr;
sin.sin_port = htons(aconf->port);
/*
* save connection info in client
*/
(cli_ip(cptr)).s_addr = aconf->ipnum.s_addr;
cli_port(cptr) = aconf->port;
ircd_ntoa_r(cli_sock_ip(cptr), (const char*) &(cli_ip(cptr)));
/*
* we want a big buffer for server connections
*/
if (!os_set_sockbufs(cli_fd(cptr), feature_int(FEAT_SOCKSENDBUF), feature_int(FEAT_SOCKRECVBUF))) {
cli_error(cptr) = errno;
report_error(SETBUFS_ERROR_MSG, cli_name(cptr), errno);
close(cli_fd(cptr));
cli_fd(cptr) = -1;
return 0;
}
/*
* ALWAYS set sockets non-blocking
*/
if (!os_set_nonblocking(cli_fd(cptr))) {
cli_error(cptr) = errno;
report_error(NONB_ERROR_MSG, cli_name(cptr), errno);
close(cli_fd(cptr));
cli_fd(cptr) = -1;
return 0;
}
if ((result = os_connect_nonb(cli_fd(cptr), &sin)) == IO_FAILURE) {
cli_error(cptr) = errno;
report_error(CONNECT_ERROR_MSG, cli_name(cptr), errno);
close(cli_fd(cptr));
cli_fd(cptr) = -1;
return 0;
}
if (!socket_add(&(cli_socket(cptr)), client_sock_callback,
(void*) cli_connect(cptr),
(result == IO_SUCCESS) ? SS_CONNECTED : SS_CONNECTING,
SOCK_EVENT_READABLE, cli_fd(cptr))) {
cli_error(cptr) = ENFILE;
report_error(REGISTER_ERROR_MSG, cli_name(cptr), ENFILE);
close(cli_fd(cptr));
cli_fd(cptr) = -1;
return 0;
}
cli_freeflag(cptr) |= FREEFLAG_SOCKET;
return 1;
}
/*
* deliver_it
* Attempt to send a sequence of bytes to the connection.
* Returns
*
* < 0 Some fatal error occurred, (but not EWOULDBLOCK).
* This return is a request to close the socket and
* clean up the link.
*
* >= 0 No real error occurred, returns the number of
* bytes actually transferred. EWOULDBLOCK and other
* possibly similar conditions should be mapped to
* zero return. Upper level routine will have to
* decide what to do with those unwritten bytes...
*
* *NOTE* alarm calls have been preserved, so this should
* work equally well whether blocking or non-blocking
* mode is used...
*
* We don't use blocking anymore, that is impossible with the
* net.loads today anyway. Commented out the alarms to save cpu.
* --Run
*/
unsigned int deliver_it(struct Client *cptr, struct MsgQ *buf)
{
unsigned int bytes_written = 0;
unsigned int bytes_count = 0;
assert(0 != cptr);
switch (os_sendv_nonb(cli_fd(cptr), buf, &bytes_count, &bytes_written)) {
case IO_SUCCESS:
ClrFlag(cptr, FLAG_BLOCKED);
cli_sendB(cptr) += bytes_written;
cli_sendB(&me) += bytes_written;
if (cli_sendB(cptr) > 1023) {
cli_sendK(cptr) += (cli_sendB(cptr) >> 10);
cli_sendB(cptr) &= 0x03ff; /* 2^10 = 1024, 3ff = 1023 */
}
if (cli_sendB(&me) > 1023) {
cli_sendK(&me) += (cli_sendB(&me) >> 10);
cli_sendB(&me) &= 0x03ff;
}
/*
* XXX - hrmm.. set blocked here? the socket didn't
* say it was blocked
*/
if (bytes_written < bytes_count)
SetFlag(cptr, FLAG_BLOCKED);
break;
case IO_BLOCKED:
SetFlag(cptr, FLAG_BLOCKED);
break;
case IO_FAILURE:
cli_error(cptr) = errno;
SetFlag(cptr, FLAG_DEADSOCKET);
break;
}
return bytes_written;
}
void release_dns_reply(struct Client* cptr)
{
assert(0 != cptr);
assert(MyConnect(cptr));
if (cli_dns_reply(cptr)) {
assert(0 < cli_dns_reply(cptr)->ref_count);
--(cli_dns_reply(cptr))->ref_count;
cli_dns_reply(cptr) = 0;
}
}
/*
* completed_connection
*
* Complete non-blocking connect()-sequence. Check access and
* terminate connection, if trouble detected.
*
* Return TRUE, if successfully completed
* FALSE, if failed and ClientExit
*/
static int completed_connection(struct Client* cptr)
{
struct ConfItem *aconf;
time_t newts;
struct Client *acptr;
int i;
assert(0 != cptr);
/*
* get the socket status from the fd first to check if
* connection actually succeeded
*/
if ((cli_error(cptr) = os_get_sockerr(cli_fd(cptr)))) {
const char* msg = strerror(cli_error(cptr));
if (!msg)
msg = "Unknown error";
sendto_opmask_butone(0, SNO_OLDSNO, "Connection failed to %s: %s",
cli_name(cptr), msg);
return 0;
}
if (!(aconf = find_conf_byname(cli_confs(cptr), cli_name(cptr), CONF_SERVER))) {
sendto_opmask_butone(0, SNO_OLDSNO, "Lost Server Line for %s", cli_name(cptr));
return 0;
}
if (s_state(&(cli_socket(cptr))) == SS_CONNECTING)
socket_state(&(cli_socket(cptr)), SS_CONNECTED);
if (!EmptyString(aconf->passwd))
sendrawto_one(cptr, MSG_PASS " :%s", aconf->passwd);
/*
* Create a unique timestamp
*/
newts = TStime();
for (i = HighestFd; i > -1; --i) {
if ((acptr = LocalClientArray[i]) &&
(IsServer(acptr) || IsHandshake(acptr))) {
if (cli_serv(acptr)->timestamp >= newts)
newts = cli_serv(acptr)->timestamp + 1;
}
}
assert(0 != cli_serv(cptr));
cli_serv(cptr)->timestamp = newts;
SetHandshake(cptr);
/*
* Make us timeout after twice the timeout for DNS look ups
*/
cli_lasttime(cptr) = CurrentTime;
SetFlag(cptr, FLAG_PINGSENT);
sendrawto_one(cptr, MSG_SERVER " %s 1 %Tu %Tu J%s %s%s +%s :%s",
cli_name(&me), cli_serv(&me)->timestamp, newts,
MAJOR_PROTOCOL, NumServCap(&me),
feature_bool(FEAT_HUB) ? "h" : "", cli_info(&me));
return (IsDead(cptr)) ? 0 : 1;
}
/*
* close_connection
*
* Close the physical connection. This function must make
* MyConnect(cptr) == FALSE, and set cptr->from == NULL.
*/
void close_connection(struct Client *cptr)
{
struct ConfItem* aconf;
if (IsServer(cptr)) {
ServerStats->is_sv++;
ServerStats->is_sbs += cli_sendB(cptr);
ServerStats->is_sbr += cli_receiveB(cptr);
ServerStats->is_sks += cli_sendK(cptr);
ServerStats->is_skr += cli_receiveK(cptr);
ServerStats->is_sti += CurrentTime - cli_firsttime(cptr);
if (ServerStats->is_sbs > 1023) {
ServerStats->is_sks += (ServerStats->is_sbs >> 10);
ServerStats->is_sbs &= 0x3ff;
}
if (ServerStats->is_sbr > 1023) {
ServerStats->is_skr += (ServerStats->is_sbr >> 10);
ServerStats->is_sbr &= 0x3ff;
}
/*
* If the connection has been up for a long amount of time, schedule
* a 'quick' reconnect, else reset the next-connect cycle.
*/
if ((aconf = find_conf_exact(cli_name(cptr), 0, cli_sockhost(cptr), CONF_SERVER))) {
/*
* Reschedule a faster reconnect, if this was a automaticly
* connected configuration entry. (Note that if we have had
* a rehash in between, the status has been changed to
* CONF_ILLEGAL). But only do this if it was a "good" link.
*/
aconf->hold = CurrentTime;
aconf->hold += ((aconf->hold - cli_since(cptr) >
feature_int(FEAT_HANGONGOODLINK)) ?
feature_int(FEAT_HANGONRETRYDELAY) : ConfConFreq(aconf));
/* if (nextconnect > aconf->hold) */
/* nextconnect = aconf->hold; */
}
}
else if (IsUser(cptr)) {
ServerStats->is_cl++;
ServerStats->is_cbs += cli_sendB(cptr);
ServerStats->is_cbr += cli_receiveB(cptr);
ServerStats->is_cks += cli_sendK(cptr);
ServerStats->is_ckr += cli_receiveK(cptr);
ServerStats->is_cti += CurrentTime - cli_firsttime(cptr);
if (ServerStats->is_cbs > 1023) {
ServerStats->is_cks += (ServerStats->is_cbs >> 10);
ServerStats->is_cbs &= 0x3ff;
}
if (ServerStats->is_cbr > 1023) {
ServerStats->is_ckr += (ServerStats->is_cbr >> 10);
ServerStats->is_cbr &= 0x3ff;
}
}
else
ServerStats->is_ni++;
if (-1 < cli_fd(cptr)) {
flush_connections(cptr);
LocalClientArray[cli_fd(cptr)] = 0;
close(cli_fd(cptr));
socket_del(&(cli_socket(cptr))); /* queue a socket delete */
cli_fd(cptr) = -1;
}
SetFlag(cptr, FLAG_DEADSOCKET);
MsgQClear(&(cli_sendQ(cptr)));
client_drop_sendq(cli_connect(cptr));
DBufClear(&(cli_recvQ(cptr)));
memset(cli_passwd(cptr), 0, sizeof(cli_passwd(cptr)));
set_snomask(cptr, 0, SNO_SET);
det_confs_butmask(cptr, 0);
if (cli_listener(cptr)) {
release_listener(cli_listener(cptr));
cli_listener(cptr) = 0;
}
for ( ; HighestFd > 0; --HighestFd) {
if (LocalClientArray[HighestFd])
break;
}
}
int net_close_unregistered_connections(struct Client* source)
{
int i;
struct Client* cptr;
int count = 0;
assert(0 != source);
for (i = HighestFd; i > 0; --i) {
if ((cptr = LocalClientArray[i]) && !IsRegistered(cptr)) {
send_reply(source, RPL_CLOSING, get_client_name(source, HIDE_IP));
exit_client(source, cptr, &me, "Oper Closing");
++count;
}
}
return count;
}
/*----------------------------------------------------------------------------
* add_connection
*
* Creates a client which has just connected to us on the given fd.
* The sockhost field is initialized with the ip# of the host.
* The client is not added to the linked list of clients, it is
* passed off to the auth handler for dns and ident queries.
*--------------------------------------------------------------------------*/
void add_connection(struct Listener* listener, int fd) {
struct sockaddr_in addr;
struct Client *new_client;
time_t next_target = 0;
const char* const throttle_message =
"ERROR :Your host is trying to (re)connect too fast -- throttled\r\n";
/* 12345678901234567890123456789012345679012345678901234567890123456 */
const char* const register_message =
"ERROR :Unable to complete your registration\r\n";
assert(0 != listener);
/*
* Removed preliminary access check. Full check is performed in m_server and
* m_user instead. Also connection time out help to get rid of unwanted
* connections.
*/
if (!os_get_peername(fd, &addr) || !os_set_nonblocking(fd)) {
++ServerStats->is_ref;
close(fd);
return;
}
/*
* Disable IP (*not* TCP) options. In particular, this makes it impossible
* to use source routing to connect to the server. If we didn't do this
* (and if intermediate networks didn't drop source-routed packets), an
* attacker could successfully IP spoof us...and even return the anti-spoof
* ping, because the options would cause the packet to be routed back to
* the spoofer's machine. When we disable the IP options, we delete the
* source route, and the normal routing takes over.
*/
os_disable_options(fd);
/*
* Add this local client to the IPcheck registry.
*
* If they're throttled, murder them, but tell them why first.
*/
if (!IPcheck_local_connect(addr.sin_addr, &next_target) && !listener->server) {
++ServerStats->is_ref;
write(fd, throttle_message, strlen(throttle_message));
close(fd);
return;
}
new_client = make_client(0, ((listener->server) ?
STAT_UNKNOWN_SERVER : STAT_UNKNOWN_USER));
/*
* Copy ascii address to 'sockhost' just in case. Then we have something
* valid to put into error messages...
*/
SetIPChecked(new_client);
ircd_ntoa_r(cli_sock_ip(new_client), (const char*) &addr.sin_addr);
strcpy(cli_sockhost(new_client), cli_sock_ip(new_client));
(cli_ip(new_client)).s_addr = addr.sin_addr.s_addr;
cli_port(new_client) = ntohs(addr.sin_port);
if (next_target)
cli_nexttarget(new_client) = next_target;
cli_fd(new_client) = fd;
if (!socket_add(&(cli_socket(new_client)), client_sock_callback,
(void*) cli_connect(new_client), SS_CONNECTED, 0, fd)) {
++ServerStats->is_ref;
write(fd, register_message, strlen(register_message));
close(fd);
cli_fd(new_client) = -1;
return;
}
cli_freeflag(new_client) |= FREEFLAG_SOCKET;
cli_listener(new_client) = listener;
++listener->ref_count;
Count_newunknown(UserStats);
/* if we've made it this far we can put the client on the auth query pile */
start_auth(new_client);
}
/*
* update_write
*
* Determines whether to tell the events engine we're interested in
* writable events
*/
void update_write(struct Client* cptr)
{
/* If there are messages that need to be sent along, or if the client
* is in the middle of a /list, then we need to tell the engine that
* we're interested in writable events--otherwise, we need to drop
* that interest.
*/
socket_events(&(cli_socket(cptr)),
((MsgQLength(&cli_sendQ(cptr)) || cli_listing(cptr)) ?
SOCK_ACTION_ADD : SOCK_ACTION_DEL) | SOCK_EVENT_WRITABLE);
}
/*
* read_packet
*
* Read a 'packet' of data from a connection and process it. Read in 8k
* chunks to give a better performance rating (for server connections).
* Do some tricky stuff for client connections to make sure they don't do
* any flooding >:-) -avalon
*/
static int
read_packet(struct Client *cptr, int socket_ready)
{
unsigned int dolen = 0;
unsigned int length = 0;
if (socket_ready &&
!(IsUser(cptr) &&
DBufLength(&(cli_recvQ(cptr))) > feature_int(FEAT_CLIENT_FLOOD))) {
switch (os_recv_nonb(cli_fd(cptr), readbuf, sizeof(readbuf), &length)) {
case IO_SUCCESS:
if (length) {
if (!IsServer(cptr))
cli_lasttime(cptr) = CurrentTime;
if (cli_lasttime(cptr) > cli_since(cptr))
cli_since(cptr) = cli_lasttime(cptr);
ClrFlag(cptr, FLAG_PINGSENT);
ClrFlag(cptr, FLAG_NONL);
}
break;
case IO_BLOCKED:
break;
case IO_FAILURE:
cli_error(cptr) = errno;
/* SetFlag(cptr, FLAG_DEADSOCKET); */
return 0;
}
}
/*
* For server connections, we process as many as we can without
* worrying about the time of day or anything :)
*/
if (length > 0 && IsServer(cptr))
return server_dopacket(cptr, readbuf, length);
else if (length > 0 && (IsHandshake(cptr) || IsConnecting(cptr)))
return connect_dopacket(cptr, readbuf, length);
else
{
/*
* Before we even think of parsing what we just read, stick
* it on the end of the receive queue and do it when its
* turn comes around.
*/
if (length > 0 && dbuf_put(&(cli_recvQ(cptr)), readbuf, length) == 0)
return exit_client(cptr, cptr, &me, "dbuf_put fail");
if (DBufLength(&(cli_recvQ(cptr))) > feature_int(FEAT_CLIENT_FLOOD))
return exit_client(cptr, cptr, &me, "Excess Flood");
while (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
(IsTrusted(cptr) || cli_since(cptr) - CurrentTime < 10))
{
dolen = dbuf_getmsg(&(cli_recvQ(cptr)), cli_buffer(cptr), BUFSIZE);
/*
* Devious looking...whats it do ? well..if a client
* sends a *long* message without any CR or LF, then
* dbuf_getmsg fails and we pull it out using this
* loop which just gets the next 512 bytes and then
* deletes the rest of the buffer contents.
* -avalon
*/
if (dolen == 0)
{
if (DBufLength(&(cli_recvQ(cptr))) < 510)
SetFlag(cptr, FLAG_NONL);
else
DBufClear(&(cli_recvQ(cptr)));
}
else if (client_dopacket(cptr, dolen) == CPTR_KILLED)
return CPTR_KILLED;
/*
* If it has become registered as a Server
* then skip the per-message parsing below.
*/
if (IsHandshake(cptr) || IsServer(cptr))
{
while (-1)
{
dolen = dbuf_get(&(cli_recvQ(cptr)), readbuf, sizeof(readbuf));
if (dolen <= 0)
return 1;
else if (dolen == 0)
{
if (DBufLength(&(cli_recvQ(cptr))) < 510)
SetFlag(cptr, FLAG_NONL);
else
DBufClear(&(cli_recvQ(cptr)));
}
else if ((IsServer(cptr) &&
server_dopacket(cptr, readbuf, dolen) == CPTR_KILLED) ||
(!IsServer(cptr) &&
connect_dopacket(cptr, readbuf, dolen) == CPTR_KILLED))
return CPTR_KILLED;
}
}
}
/* If there's still data to process, wait 2 seconds first */
if (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
!t_onqueue(&(cli_proc(cptr))))
{
Debug((DEBUG_LIST, "Adding client process timer for %C", cptr));
cli_freeflag(cptr) |= FREEFLAG_TIMER;
timer_add(&(cli_proc(cptr)), client_timer_callback, cli_connect(cptr),
TT_RELATIVE, 2);
}
}
return 1;
}
/*
* connect_server - start or complete a connection to another server
* returns true (1) if successful, false (0) otherwise
*
* aconf must point to a valid C:line
* m_connect calls this with a valid by client and a null reply
* try_connections calls this with a null by client, and a null reply
* connect_dns_callback call this with a null by client, and a valid reply
*
* XXX - if this comes from an m_connect message and a dns query needs to
* be done, we loose the information about who started the connection and
* it's considered an auto connect.
*/
int connect_server(struct ConfItem* aconf, struct Client* by,
struct DNSReply* reply)
{
struct Client* cptr = 0;
assert(0 != aconf);
if (aconf->dns_pending) {
sendto_opmask_butone(0, SNO_OLDSNO, "Server %s connect DNS pending",
aconf->name);
return 0;
}
Debug((DEBUG_NOTICE, "Connect to %s[@%s]", aconf->name,
ircd_ntoa((const char*) &aconf->ipnum)));
if ((cptr = FindClient(aconf->name))) {
if (IsServer(cptr) || IsMe(cptr)) {
sendto_opmask_butone(0, SNO_OLDSNO, "Server %s already present from %s",
aconf->name, cli_name(cli_from(cptr)));
if (by && IsUser(by) && !MyUser(by)) {
sendcmdto_one(&me, CMD_NOTICE, by, "%C :Server %s already present "
"from %s", by, aconf->name, cli_name(cli_from(cptr)));
}
return 0;
}
else if (IsHandshake(cptr) || IsConnecting(cptr)) {
if (by && IsUser(by)) {
sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connection to %s already in "
"progress", by, cli_name(cptr));
}
return 0;
}
}
/*
* If we dont know the IP# for this host and itis a hostname and
* not a ip# string, then try and find the appropriate host record.
*/
if (INADDR_NONE == aconf->ipnum.s_addr) {
char buf[HOSTLEN + 1];
assert(0 == reply);
if (INADDR_NONE == (aconf->ipnum.s_addr = inet_addr(aconf->host))) {
struct DNSQuery query;
query.vptr = aconf;
query.callback = connect_dns_callback;
host_from_uh(buf, aconf->host, HOSTLEN);
buf[HOSTLEN] = '\0';
reply = gethost_byname(buf, &query);
if (!reply) {
aconf->dns_pending = 1;
return 0;
}
memcpy(&aconf->ipnum, reply->hp->h_addr, sizeof(struct in_addr));
}
}
cptr = make_client(NULL, STAT_UNKNOWN_SERVER);
if (reply)
++reply->ref_count;
cli_dns_reply(cptr) = reply;
/*
* Copy these in so we have something for error detection.
*/
ircd_strncpy(cli_name(cptr), aconf->name, HOSTLEN);
ircd_strncpy(cli_sockhost(cptr), aconf->host, HOSTLEN);
/*
* Attach config entries to client here rather than in
* completed_connection. This to avoid null pointer references
*/
attach_confs_byhost(cptr, aconf->host, CONF_SERVER);
if (!find_conf_byhost(cli_confs(cptr), aconf->host, CONF_SERVER)) {
sendto_opmask_butone(0, SNO_OLDSNO, "Host %s is not enabled for "
"connecting: no C-line", aconf->name);
if (by && IsUser(by) && !MyUser(by)) {
sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connect to host %s failed: no "
"C-line", by, aconf->name);
}
det_confs_butmask(cptr, 0);
free_client(cptr);
return 0;
}
/*
* attempt to connect to the server in the conf line
*/
if (!connect_inet(aconf, cptr)) {
if (by && IsUser(by) && !MyUser(by)) {
sendcmdto_one(&me, CMD_NOTICE, by, "%C :Couldn't connect to %s", by,
cli_name(cptr));
}
det_confs_butmask(cptr, 0);
free_client(cptr);
return 0;
}
/*
* NOTE: if we're here we have a valid C:Line and the client should
* have started the connection and stored the remote address/port and
* ip address name in itself
*
* The socket has been connected or connect is in progress.
*/
make_server(cptr);
if (by && IsUser(by)) {
ircd_snprintf(0, cli_serv(cptr)->by, sizeof(cli_serv(cptr)->by), "%s%s",
NumNick(by));
assert(0 == cli_serv(cptr)->user);
cli_serv(cptr)->user = cli_user(by);
cli_user(by)->refcnt++;
}
else {
*(cli_serv(cptr))->by = '\0';
/* strcpy(cptr->serv->by, "Auto"); */
}
cli_serv(cptr)->up = &me;
SetConnecting(cptr);
if (cli_fd(cptr) > HighestFd)
HighestFd = cli_fd(cptr);
LocalClientArray[cli_fd(cptr)] = cptr;
Count_newunknown(UserStats);
/* Actually we lie, the connect hasn't succeeded yet, but we have a valid
* cptr, so we register it now.
* Maybe these two calls should be merged.
*/
add_client_to_list(cptr);
hAddClient(cptr);
/* nextping = CurrentTime; */
return (s_state(&cli_socket(cptr)) == SS_CONNECTED) ?
completed_connection(cptr) : 1;
}
/*
* Setup local socket structure to use for binding to.
*/
void set_virtual_host(struct in_addr addr)
{
memset(&VirtualHost, 0, sizeof(VirtualHost));
VirtualHost.sin_family = AF_INET;
VirtualHost.sin_addr.s_addr = addr.s_addr;
}
/*
* Find the real hostname for the host running the server (or one which
* matches the server's name) and its primary IP#. Hostname is stored
* in the client structure passed as a pointer.
*/
void init_server_identity(void)
{
const struct LocalConf* conf = conf_get_local();
assert(0 != conf);
ircd_strncpy(cli_name(&me), conf->name, HOSTLEN);
SetYXXServerName(&me, conf->numeric);
}
/*
* Process events on a client socket
*/
static void client_sock_callback(struct Event* ev)
{
struct Client* cptr;
struct Connection* con;
char *fmt = "%s";
char *fallback = 0;
assert(0 != ev_socket(ev));
assert(0 != s_data(ev_socket(ev)));
con = s_data(ev_socket(ev));
assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);
cptr = con_client(con);
assert(0 == cptr || con == cli_connect(cptr));
switch (ev_type(ev)) {
case ET_DESTROY:
con_freeflag(con) &= ~FREEFLAG_SOCKET;
if (!con_freeflag(con) && !cptr)
free_connection(con);
break;
case ET_CONNECT: /* socket connection completed */
if (!completed_connection(cptr) || IsDead(cptr))
fallback = cli_info(cptr);
break;
case ET_ERROR: /* an error occurred */
fallback = cli_info(cptr);
cli_error(cptr) = ev_data(ev);
if (s_state(&(con_socket(con))) == SS_CONNECTING) {
completed_connection(cptr);
break;
}
/*FALLTHROUGH*/
case ET_EOF: /* end of file on socket */
Debug((DEBUG_ERROR, "READ ERROR: fd = %d %d", cli_fd(cptr),
cli_error(cptr)));
SetFlag(cptr, FLAG_DEADSOCKET);
if ((IsServer(cptr) || IsHandshake(cptr)) && cli_error(cptr) == 0) {
exit_client_msg(cptr, cptr, &me, "Server %s closed the connection (%s)",
cli_name(cptr), cli_serv(cptr)->last_error_msg);
return;
} else {
fmt = "Read error: %s";
fallback = "EOF from client";
}
break;
case ET_WRITE: /* socket is writable */
ClrFlag(cptr, FLAG_BLOCKED);
if (cli_listing(cptr) && MsgQLength(&(cli_sendQ(cptr))) < 2048)
list_next_channels(cptr, 64);
Debug((DEBUG_SEND, "Sending queued data to %C", cptr));
send_queued(cptr);
break;
case ET_READ: /* socket is readable */
if (!IsDead(cptr)) {
Debug((DEBUG_DEBUG, "Reading data from %C", cptr));
if (read_packet(cptr, 1) == 0) /* error while reading packet */
fallback = "EOF from client";
}
break;
default:
#ifndef NDEBUG
abort(); /* unrecognized event */
#endif
break;
}
assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));
if (fallback) {
const char* msg = (cli_error(cptr)) ? strerror(cli_error(cptr)) : fallback;
if (!msg)
msg = "Unknown error";
exit_client_msg(cptr, cptr, &me, fmt, msg);
}
}
/*
* Process a timer on client socket
*/
static void client_timer_callback(struct Event* ev)
{
struct Client* cptr;
struct Connection* con;
assert(0 != ev_timer(ev));
assert(0 != t_data(ev_timer(ev)));
assert(ET_DESTROY == ev_type(ev) || ET_EXPIRE == ev_type(ev));
con = t_data(ev_timer(ev));
assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);
cptr = con_client(con);
assert(0 == cptr || con == cli_connect(cptr));
if (ev_type(ev)== ET_DESTROY) {
con_freeflag(con) &= ~FREEFLAG_TIMER; /* timer has expired... */
if (!con_freeflag(con) && !cptr)
free_connection(con); /* client is being destroyed */
} else {
Debug((DEBUG_LIST, "Client process timer for %C expired; processing",
cptr));
read_packet(cptr, 0); /* read_packet will re-add timer if needed */
}
assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));
}
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