/*
* IRC - Internet Relay Chat, ircd/ircd.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: ircd.c 796 2004-09-08 22:47:14Z r33d $
*/
#include "config.h"
#include "ircd.h"
#include "IPcheck.h"
#include "class.h"
#include "client.h"
#include "crule.h"
#include "hash.h"
#include "ircd_alloc.h"
#include "ircd_events.h"
#include "ircd_features.h"
#include "ircd_log.h"
#include "ircd_reply.h"
#include "ircd_signal.h"
#include "ircd_string.h"
#include "jupe.h"
#include "list.h"
#include "match.h"
#include "motd.h"
#include "msg.h"
#include "numeric.h"
#include "numnicks.h"
#include "opercmds.h"
#include "parse.h"
#include "querycmds.h"
#include "res.h"
#include "s_auth.h"
#include "s_bsd.h"
#include "s_conf.h"
#include "s_debug.h"
#include "s_misc.h"
#include "s_stats.h"
#include "send.h"
#ifdef USE_SSL
#include "ssl.h"
#endif /* USE_SSL */
#include "sys.h"
#include "uping.h"
#include "userload.h"
#include "version.h"
#include "whowas.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
/*----------------------------------------------------------------------------
* External stuff
*--------------------------------------------------------------------------*/
extern void init_counters(void);
/*----------------------------------------------------------------------------
* Constants / Enums
*--------------------------------------------------------------------------*/
enum {
BOOT_DEBUG = 1,
BOOT_TTY = 2
};
/*----------------------------------------------------------------------------
* Global data (YUCK!)
*--------------------------------------------------------------------------*/
struct Client me; /* That's me */
struct Connection me_con; /* That's me too */
struct Client *GlobalClientList = &me; /* Pointer to beginning of
Client list */
time_t TSoffset = 0;/* Offset of timestamps to system clock */
int GlobalRehashFlag = 0; /* do a rehash if set */
int GlobalRestartFlag = 0; /* do a restart if set */
time_t CurrentTime; /* Updated every time we leave select() */
char *configfile = CPATH; /* Server configuration file */
char *logfile = LPATH;
int debuglevel = -1; /* Server debug level */
char *debugmode = ""; /* Server debug level */
static char *dpath = DPATH;
static char *spath = SPATH;
static struct Timer connect_timer; /* timer structure for try_connections() */
static struct Timer ping_timer; /* timer structure for check_pings() */
static struct Daemon thisServer = { 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0 };
int running = 1;
/*----------------------------------------------------------------------------
* API: server_die
*--------------------------------------------------------------------------*/
void server_die(const char* message) {
/* log_write will send out message to both log file and as server notice */
log_write(LS_SYSTEM, L_CRIT, 0, "Server terminating: %s", message);
flush_connections(0);
close_connections(1);
running = 0;
}
/*----------------------------------------------------------------------------
* API: server_panic
*--------------------------------------------------------------------------*/
void server_panic(const char* message) {
/* inhibit sending server notice--we may be panicing due to low memory */
log_write(LS_SYSTEM, L_CRIT, LOG_NOSNOTICE, "Server panic: %s", message);
flush_connections(0);
log_close();
close_connections(1);
exit(1);
}
/*----------------------------------------------------------------------------
* API: server_restart
*--------------------------------------------------------------------------*/
void server_restart(const char* message) {
static int restarting = 0;
/* inhibit sending any server notices; we may be in a loop */
log_write(LS_SYSTEM, L_WARNING, LOG_NOSNOTICE, "Restarting Server: %s",
message);
if (restarting++) /* increment restarting to prevent looping */
return;
sendto_opmask_butone(0, SNO_OLDSNO, "Restarting server: %s", message);
Debug((DEBUG_NOTICE, "Restarting server..."));
flush_connections(0);
log_close();
close_connections(!(thisServer.bootopt & (BOOT_TTY | BOOT_DEBUG)));
execv(SPATH, thisServer.argv);
/* Have to reopen since it has been closed above */
log_reopen();
log_write(LS_SYSTEM, L_CRIT, 0, "execv(%s,%s) failed: %m", SPATH,
*thisServer.argv);
Debug((DEBUG_FATAL, "Couldn't restart server \"%s\": %s",
SPATH, (strerror(errno)) ? strerror(errno) : ""));
exit(8);
}
/*----------------------------------------------------------------------------
* outofmemory: Handler for out of memory conditions...
*--------------------------------------------------------------------------*/
static void outofmemory(void) {
Debug((DEBUG_FATAL, "Out of memory: restarting server..."));
server_restart("Out of Memory");
}
/*----------------------------------------------------------------------------
* write_pidfile
*--------------------------------------------------------------------------*/
static void write_pidfile(void) {
char buff[20];
if ((thisServer.pid_fd >= 0) && (!feature_bool(FEAT_NEFARIOUS))) {
memset(buff, 0, sizeof(buff));
sprintf(buff, "%5d\n", (int)getpid());
if (write(thisServer.pid_fd, buff, strlen(buff)) == -1)
Debug((DEBUG_NOTICE, "Error writing to pid file %s: %m",
feature_str(FEAT_PPATH)));
return;
}
Debug((DEBUG_NOTICE, "Error opening pid file %s: %m",
feature_str(FEAT_PPATH)));
}
/* check_pid
*
* inputs:
* none
* returns:
* true - if the pid file exists (and is readable), and the pid refered
* to in the file is still running.
* false - otherwise.
*/
static int check_pid(void)
{
struct flock lock;
lock.l_type = F_WRLCK;
lock.l_start = 0;
lock.l_whence = SEEK_SET;
lock.l_len = 0;
if (((thisServer.pid_fd = open(feature_str(FEAT_PPATH),
O_CREAT | O_RDWR, 0600)) >= 0) && (!feature_bool(FEAT_NEFARIOUS)))
return fcntl(thisServer.pid_fd, F_SETLK, &lock);
return 0;
}
/*----------------------------------------------------------------------------
* try_connections
*
* Scan through configuration and try new connections.
*
* Returns the calendar time when the next call to this
* function should be made latest. (No harm done if this
* is called earlier or later...)
*--------------------------------------------------------------------------*/
static void try_connections(struct Event* ev) {
struct ConfItem* aconf;
struct Client* cptr;
struct ConfItem** pconf;
int connecting;
int confrq;
time_t next = 0;
struct ConnectionClass* cltmp;
struct ConfItem* con_conf = 0;
struct Jupe* ajupe;
unsigned int con_class = 0;
assert(ET_EXPIRE == ev_type(ev));
assert(0 != ev_timer(ev));
connecting = FALSE;
Debug((DEBUG_NOTICE, "Connection check at : %s", myctime(CurrentTime)));
for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
/* Also when already connecting! (update holdtimes) --SRB */
if (!(aconf->status & CONF_SERVER) || aconf->port == 0)
continue;
/* Also skip juped servers */
if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe))
continue;
/* Skip this entry if the use of it is still on hold until
* future. Otherwise handle this entry (and set it on hold until next
* time). Will reset only hold times, if already made one successfull
* connection... [this algorithm is a bit fuzzy... -- msa >;) ]
*/
if (aconf->hold > CurrentTime && (next > aconf->hold || next == 0)) {
next = aconf->hold;
continue;
}
cltmp = aconf->conn_class;
confrq = get_con_freq(cltmp);
if(confrq == 0)
aconf->hold = next = 0;
else
aconf->hold = CurrentTime + confrq;
/* Found a CONNECT config with port specified, scan clients and see if
* this server is already connected?
*/
cptr = FindServer(aconf->name);
if (!cptr && (Links(cltmp) < MaxLinks(cltmp)) &&
(!connecting || (ConClass(cltmp) > con_class))) {
/*
* Check connect rules to see if we're allowed to try
*/
if (0 == conf_eval_crule(aconf->name, CRULE_MASK)) {
con_class = ConClass(cltmp);
con_conf = aconf;
/* We connect only one at time... */
connecting = TRUE;
}
}
if ((next > aconf->hold) || (next == 0))
next = aconf->hold;
}
if (connecting) {
if (con_conf->next) { /* are we already last? */
/* Put the current one at the end and make sure we try all connections */
for (pconf = &GlobalConfList; (aconf = *pconf); pconf = &(aconf->next))
if (aconf == con_conf)
*pconf = aconf->next;
(*pconf = con_conf)->next = 0;
}
if (connect_server(con_conf, 0, 0))
sendto_opmask_butone(0, SNO_OLDSNO, "Connection to %s activated.",
con_conf->name);
}
if (next == 0)
next = CurrentTime + feature_int(FEAT_CONNECTFREQUENCY);
Debug((DEBUG_NOTICE, "Next connection check : %s", myctime(next)));
timer_add(&connect_timer, try_connections, 0, TT_ABSOLUTE, next);
}
/*----------------------------------------------------------------------------
* check_pings
*
* TODO: This should be moved out of ircd.c. It's protocol-specific when you
* get right down to it. Can't really be done until the server is more
* modular, however...
*--------------------------------------------------------------------------*/
static void check_pings(struct Event* ev) {
int expire = 0;
int next_check = CurrentTime;
int max_ping = 0;
int i;
assert(ET_EXPIRE == ev_type(ev));
assert(0 != ev_timer(ev));
next_check += feature_int(FEAT_PINGFREQUENCY);
/* Scan through the client table */
for (i=0; i <= HighestFd; i++) {
struct Client *cptr = LocalClientArray[i];
if (!cptr)
continue;
assert(&me != cptr); /* I should never be in the local client array! */
/* Remove dead clients. */
if (IsDead(cptr)) {
exit_client(cptr, cptr, &me, cli_info(cptr));
continue;
}
max_ping = IsRegistered(cptr) ? client_get_ping(cptr) :
feature_int(FEAT_CONNECTTIMEOUT);
Debug((DEBUG_DEBUG, "check_pings(%s)=status:%s limit: %d current: %d",
cli_name(cptr),
HasFlag(cptr, FLAG_PINGSENT) ? "[Ping Sent]" : "[]",
max_ping, (int)(CurrentTime - cli_lasttime(cptr))));
/* Ok, the thing that will happen most frequently, is that someone will
* have sent something recently. Cover this first for speed.
* --
* If it's an unregisterd client and hasn't managed to register within
* max_ping then it's obviously having problems (broken client) or it's
* just up to no good, so we won't skip it, even if its been sending
* data to us.
* -- hikari */
if ((CurrentTime-cli_lasttime(cptr) < max_ping) &&
(IsRegistered(cptr))) {
expire = cli_lasttime(cptr) + max_ping;
if (expire < next_check)
next_check = expire;
continue;
}
/* Unregistered clients pingout after max_ping seconds, they don't
* get given a second chance - if they were then people could not quite
* finish registration and hold resources without being subject to k/g
* lines
*/
if (!IsRegistered(cptr)) {
assert(!IsServer(cptr));
if ((CurrentTime-cli_firsttime(cptr) >= max_ping)) {
/* Display message if they have sent a NICK and a USER but no
* nospoof PONG.
*/
if (*(cli_name(cptr)) && cli_user(cptr) && *(cli_user(cptr))->username) {
send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
":Your client may not be compatible with this server.");
send_reply(cptr, SND_EXPLICIT | ERR_BADPING,
":Compatible clients are available at %s",
feature_str(FEAT_URL_CLIENTS));
}
exit_client_msg(cptr,cptr,&me, "Registration Timeout");
continue;
} else {
/* OK, they still have enough time left, so we'll just skip to the
* next client. Set the next check to be when their time is up, if
* that's before the currently scheduled next check -- hikari */
expire = cli_firsttime(cptr) + max_ping;
if (expire < next_check)
next_check = expire;
continue;
}
}
/* Quit the client after max_ping*2 - they should have answered by now */
if (CurrentTime-cli_lasttime(cptr) >= (max_ping*2) ) {
/* If it was a server, then tell ops about it. */
if (IsServer(cptr) || IsConnecting(cptr) || IsHandshake(cptr))
sendto_opmask_butone(0, SNO_OLDSNO,
"No response from %s, closing link",
cli_name(cptr));
if (feature_bool(FEAT_TIME_IN_TIMEOUT))
exit_client_msg(cptr, cptr, &me, "Ping timeout: %d seconds",CurrentTime-cli_lasttime(cptr));
else
exit_client_msg(cptr, cptr, &me, "Ping timeout");
continue;
}
if (!HasFlag(cptr, FLAG_PINGSENT)) {
/* If we havent PINGed the connection and we havent heard from it in a
* while, PING it to make sure it is still alive.
*/
SetFlag(cptr, FLAG_PINGSENT);
/* If we're late in noticing don't hold it against them :) */
cli_lasttime(cptr) = CurrentTime - max_ping;
if (IsUser(cptr))
sendrawto_one(cptr, MSG_PING " :%s", cli_name(&me));
else {
char *asll_ts = militime_float(NULL);
sendcmdto_one(&me, CMD_PING, cptr, "!%s %s %s", asll_ts,
cli_name(cptr), asll_ts);
}
}
expire = cli_lasttime(cptr) + max_ping * 2;
if (expire < next_check)
next_check=expire;
}
assert(next_check >= CurrentTime);
Debug((DEBUG_DEBUG, "[%i] check_pings() again in %is",
CurrentTime, next_check-CurrentTime));
timer_add(&ping_timer, check_pings, 0, TT_ABSOLUTE, next_check);
}
/*----------------------------------------------------------------------------
* parse_command_line
* Side Effects: changes GLOBALS me, thisServer, dpath, configfile, debuglevel
* debugmode
*--------------------------------------------------------------------------*/
static void parse_command_line(int argc, char** argv) {
const char *options = "d:s:f:l:h:ntvx:";
int opt;
if (thisServer.euid != thisServer.uid)
setuid(thisServer.uid);
/* Do we really need to santiy check the non-NULLness of optarg? That's
* getopt()'s job... Removing those... -zs
*/
while ((opt = getopt(argc, argv, options)) != EOF)
switch (opt) {
case 'n':
case 't': thisServer.bootopt |= BOOT_TTY; break;
case 'd': dpath = optarg; break;
case 's': spath = optarg; break;
case 'f': configfile = optarg; break;
case 'l': logfile = optarg; break;
case 'h': ircd_strncpy(cli_name(&me), optarg, HOSTLEN); break;
case 'v':
printf("ircd %s\n", version);
printf("Event engines: ");
#ifdef USE_KQUEUE
printf("kqueue() ");
#endif
#ifdef USE_DEVPOLL
printf("/dev/poll ");
#endif
#ifdef USE_POLL
printf("poll()");
#else
printf("select()");
#endif
printf("\nCompiled for a maximum of %d connections.\n", MAXCONNECTIONS);
exit(0);
break;
case 'x':
debuglevel = atoi(optarg);
if (debuglevel < 0)
debuglevel = 0;
debugmode = optarg;
thisServer.bootopt |= BOOT_DEBUG;
break;
default:
printf("Usage: ircd [-f config] [-d configpath] [-s serverpath] [-h servername] [-l logpath] [-x loglevel] [-ntv]\n");
printf("\n -n -t\t Don't detach\n -v\t display version\n\n");
printf("Server not started.\n");
exit(1);
}
}
/*----------------------------------------------------------------------------
* daemon_init
*--------------------------------------------------------------------------*/
static void daemon_init(int no_fork) {
if (!init_connection_limits())
exit(9);
close_connections(!(thisServer.bootopt & (BOOT_DEBUG | BOOT_TTY)));
if (no_fork)
return;
if (fork())
exit(0);
#ifdef TIOCNOTTY
{
int fd;
if ((fd = open("/dev/tty", O_RDWR)) > -1) {
ioctl(fd, TIOCNOTTY, 0);
close(fd);
}
}
#endif
setsid();
}
/*----------------------------------------------------------------------------
* check_file_access: random helper function to make sure that a file is
* accessible in a certain way, and complain if not.
*--------------------------------------------------------------------------*/
static char check_file_access(const char *path, char which, int mode) {
if (!access(path, mode))
return 1;
fprintf(stderr,
"Check on %cPATH (%s) failed: %s\n"
"Please create this file and/or rerun `configure' "
"using --with-%cpath and recompile to correct this.\n",
which, path, strerror(errno), which);
return 0;
}
/*----------------------------------------------------------------------------
* set_core_limit
*--------------------------------------------------------------------------*/
#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
static void set_core_limit(void) {
struct rlimit corelim;
if (getrlimit(RLIMIT_CORE, &corelim)) {
fprintf(stderr, "Read of rlimit core size failed: %s\n", strerror(errno));
corelim.rlim_max = RLIM_INFINITY; /* Try to recover */
}
corelim.rlim_cur = corelim.rlim_max;
if (setrlimit(RLIMIT_CORE, &corelim))
fprintf(stderr, "Setting rlimit core size failed: %s\n", strerror(errno));
}
#endif
/*----------------------------------------------------------------------------
* set_userid_if_needed()
*--------------------------------------------------------------------------*/
static int set_userid_if_needed(void) {
if (getuid() == 0 || geteuid() == 0 ||
getgid() == 0 || getegid() == 0) {
fprintf(stderr, "ERROR: This server will not run as superuser.\n");
return 0;
}
return 1;
}
/*----------------------------------------------------------------------------
* main - entrypoint
*
* TODO: This should set the basic environment up and start the main loop.
* we're doing waaaaaaaaay too much server initialization here. I hate
* long and ugly control paths... -smd
*--------------------------------------------------------------------------*/
int main(int argc, char **argv) {
CurrentTime = time(NULL);
thisServer.argc = argc;
thisServer.argv = argv;
thisServer.uid = getuid();
thisServer.euid = geteuid();
#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
set_core_limit();
#endif
umask(077); /* better safe than sorry --SRB */
memset(&me, 0, sizeof(me));
memset(&me_con, 0, sizeof(me_con));
cli_connect(&me) = &me_con;
cli_fd(&me) = -1;
parse_command_line(argc, argv);
if (chdir(dpath)) {
fprintf(stderr, "Fail: Cannot chdir(%s): %s, check DPATH\n", dpath, strerror(errno));
return 2;
}
if (!set_userid_if_needed())
return 3;
/* Check paths for accessibility */
if (!check_file_access(SPATH, 'S', X_OK) ||
!check_file_access(configfile, 'C', R_OK))
return 4;
debug_init(thisServer.bootopt & BOOT_TTY);
daemon_init(thisServer.bootopt & BOOT_TTY);
event_init(MAXCONNECTIONS);
setup_signals();
feature_init(); /* initialize features... */
log_init(*argv);
set_nomem_handler(outofmemory);
if (!init_string()) {
log_write(LS_SYSTEM, L_CRIT, 0, "Failed to initialize string module");
return 6;
}
initload();
init_list();
init_hash();
init_class();
initwhowas();
initmsgtree();
initstats();
init_resolver();
motd_init();
if (!init_conf()) {
log_write(LS_SYSTEM, L_CRIT, 0, "Failed to read configuration file %s",
configfile);
return 7;
}
if (check_pid()) {
Debug((DEBUG_FATAL, "Failed to acquire PID file lock after fork"));
exit(2);
}
init_server_identity();
uping_init();
#ifdef USE_SSL
ssl_init();
#endif /* USE_SSL */
stats_init();
IPcheck_init();
timer_add(timer_init(&connect_timer), try_connections, 0, TT_RELATIVE, 1);
timer_add(timer_init(&ping_timer), check_pings, 0, TT_RELATIVE, 1);
CurrentTime = time(NULL);
SetMe(&me);
cli_magic(&me) = CLIENT_MAGIC;
cli_from(&me) = &me;
make_server(&me);
cli_serv(&me)->timestamp = TStime(); /* Abuse own link timestamp as start TS */
cli_serv(&me)->prot = atoi(MAJOR_PROTOCOL);
cli_serv(&me)->up = &me;
cli_serv(&me)->down = NULL;
cli_handler(&me) = SERVER_HANDLER;
SetYXXCapacity(&me, MAXCLIENTS);
cli_lasttime(&me) = cli_since(&me) = cli_firsttime(&me) = CurrentTime;
hAddClient(&me);
write_pidfile();
init_counters();
load_tunefile();
Debug((DEBUG_NOTICE, "Server ready..."));
log_write(LS_SYSTEM, L_NOTICE, 0, "Server Ready");
event_loop();
return 0;
}
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