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ircu2.9.32/ircd/s_bsd.c

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/************************************************************************
* 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.
*/
/* -- Jto -- 07 Jul 1990
* Added jlp@hamblin.byu.edu's debugtty fix
*/
/* -- Armin -- Jun 18 1990
* Added setdtablesize() for more socket connections
* (sequent OS Dynix only) -- maybe select()-call must be changed ...
*/
/* -- Jto -- 13 May 1990
* Added several fixes from msa:
* Better error messages
* Changes in check_access
* Added SO_REUSEADDR fix from zessel@informatik.uni-kl.de
*/
#ifndef lint
static char sccsid[] = "@(#)s_bsd.c 2.78 2/7/94 (C) 1988 University of Oulu, \
Computing Center and Jarkko Oikarinen";
#endif
#include "struct.h"
#include "common.h"
#include "sys.h"
#include "res.h"
#include "numeric.h"
#include "patchlevel.h"
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#if defined(SOL20)
#include <sys/filio.h>
#endif
#if defined(UNIXPORT) && (!defined(SVR3) || defined(sgi) || \
defined(_SEQUENT_))
# include <sys/un.h>
#endif
#include "inet.h"
#include <stdio.h>
#include <signal.h>
#include <fcntl.h>
#include <utmp.h>
#include <sys/resource.h>
#ifdef AIX
# include <time.h>
# include <arpa/nameser.h>
#else
# include "nameser.h"
#endif
#include "resolv.h"
#include "sock.h" /* If FD_ZERO isn't define up to this point, */
/* define it (BSD4.2 needs this) */
#include "h.h"
#ifndef IN_LOOPBACKNET
#define IN_LOOPBACKNET 0x7f
#endif
aClient *local[MAXCONNECTIONS];
int highest_fd = 0, readcalls = 0, udpfd = -1, resfd = -1;
static struct sockaddr_in mysk;
static void polludp();
static struct sockaddr *connect_inet PROTO((aConfItem *, aClient *, int *));
static int completed_connection PROTO((aClient *));
static int check_init PROTO((aClient *, char *));
static void do_dns_async PROTO(()), set_sock_opts PROTO((int, aClient *));
#ifdef UNIXPORT
static struct sockaddr *connect_unix PROTO((aConfItem *, aClient *, int *));
static void add_unixconnection PROTO((aClient *, int));
static char unixpath[256];
#endif
static char readbuf[8192];
extern char *version;
extern int dorehash;
extern char *last_dead_comment;
#ifdef VIRTUAL_HOST
struct sockaddr_in vserv;
#endif
/*
* Try and find the correct name to use with getrlimit() for setting the max.
* number of files allowed to be open by this process.
*/
#ifdef RLIMIT_FDMAX
# define RLIMIT_FD_MAX RLIMIT_FDMAX
#else
# ifdef RLIMIT_NOFILE
# define RLIMIT_FD_MAX RLIMIT_NOFILE
# else
# ifdef RLIMIT_OPEN_MAX
# define RLIMIT_FD_MAX RLIMIT_OPEN_MAX
# else
# undef RLIMIT_FD_MAX
# endif
# endif
#endif
extern void list_next_channels PROTO((aClient *, int));
/*
** add_local_domain()
** Add the domain to hostname, if it is missing
** (as suggested by eps@TOASTER.SFSU.EDU)
*/
void add_local_domain(hname, size)
char *hname;
int size;
{
#ifdef RES_INIT
/* try to fix up unqualified names */
if (!index(hname, '.'))
{
if (!(_res.options & RES_INIT))
{
Debug((DEBUG_DNS,"res_init()"));
res_init();
}
if (_res.defdname[0])
{
(void)strncat(hname, ".", size-1);
(void)strncat(hname, _res.defdname, size-2);
}
}
#endif
return;
}
/*
** 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(text, cptr)
char *text;
aClient *cptr;
{
Reg1 int errtmp = errno; /* debug may change 'errno' */
Reg2 char *host;
int err;
socklen_t len = sizeof(err);
extern char *strerror();
host = (cptr) ? get_client_name(cptr, FALSE) : "";
Debug((DEBUG_ERROR, text, host, strerror(errtmp)));
/*
* Get the *real* error from the socket (well try to anyway..).
* This may only work when SO_DEBUG is enabled but its worth the
* gamble anyway.
*/
#ifdef SO_ERROR
if (cptr && !IsMe(cptr) && cptr->fd >= 0)
if (!getsockopt(cptr->fd, SOL_SOCKET, SO_ERROR, (OPT_TYPE *)&err, &len))
if (err)
errtmp = err;
#endif
sendto_ops(text, host, strerror(errtmp));
#ifdef USE_SYSLOG
syslog(LOG_WARNING, text, host, strerror(errtmp));
#endif
return;
}
/*
* inetport
*
* Create a socket in the AF_INET domain, bind it to the port given in
* 'port' and listen to it. Connections are accepted to this socket
* depending on the IP# mask given by 'name'. Returns the fd of the
* socket created or -1 on error.
*/
int inetport(cptr, name, port)
aClient *cptr;
char *name;
int port;
{
static struct sockaddr_in server;
socklen_t len = sizeof(server);
int ad[4], opt;
char ipname[20];
#ifdef VIRTUAL_HOST
struct hostent *hep;
struct in_addr bind_addr;
#endif
ad[0] = ad[1] = ad[2] = ad[3] = 0;
/*
* do it this way because building ip# from separate values for each
* byte requires endian knowledge or some nasty messing. Also means
* easy conversion of "*" 0.0.0.0 or 134.* to 134.0.0.0 :-)
*/
(void)sscanf(name, "%d.%d.%d.%d", &ad[0], &ad[1], &ad[2], &ad[3]);
(void)sprintf(ipname, "%d.%d.%d.%d", ad[0], ad[1], ad[2], ad[3]);
if (cptr != &me)
{
(void)sprintf(cptr->sockhost, "%-.42s.%.u",
name, (unsigned int)port);
(void)strcpy(cptr->name, me.name);
}
/*
* At first, open a new socket
*/
if (cptr->fd == -1)
{
(void)alarm(2);
cptr->fd = socket(AF_INET, SOCK_STREAM, 0);
(void)alarm(0);
if (cptr->fd < 0 && errno == EAGAIN)
{
sendto_ops("opening stream socket %s: No more sockets",
get_client_name(cptr, TRUE));
return -1;
}
}
if (cptr->fd < 0)
{
report_error("opening stream socket %s:%s", cptr);
return -1;
}
else if (cptr->fd >= MAXCLIENTS)
{
sendto_ops("No more connections allowed (%s)", cptr->name);
(void)close(cptr->fd);
return -1;
}
opt = 1;
setsockopt(cptr->fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
/* set_sock_opts(cptr->fd, cptr); */
/*
* Bind a port to listen for new connections if port is non-null,
* else assume it is already open and try get something from it.
*/
if (port)
{
server.sin_family = AF_INET;
#ifdef VIRTUAL_HOST
bzero((char *) &vserv, sizeof(vserv));
vserv.sin_family = AF_INET;
hep = gethostbyname(me.name);
if (hep && hep->h_addrtype == AF_INET &&
hep->h_addr_list[0] && !hep->h_addr_list[1])
{
memcpy(&bind_addr, hep->h_addr_list[0],
sizeof(struct in_addr));
vserv.sin_addr = server.sin_addr = bind_addr;
}
else
{
report_error("creating virtual host %s:%s", cptr);
return -1;
}
#else
server.sin_addr.s_addr = INADDR_ANY;
#endif
#ifdef TESTNET
server.sin_port = htons(port + 10000);
#else
server.sin_port = htons(port);
#endif
/*
* Try 10 times to bind the socket with an interval of 20
* seconds. Do this so we dont have to keepp trying manually
* to bind. Why ? Because a port that has closed often lingers
* around for a short time.
* This used to be the case. Now it no longer is.
* Could cause the server to hang for too long - avalon
*/
if (bind(cptr->fd, (struct sockaddr *)&server,
sizeof(server)) == -1)
{
report_error("binding stream socket %s:%s", cptr);
(void)close(cptr->fd);
return -1;
}
}
if (getsockname(cptr->fd, (struct sockaddr *)&server, &len))
{
report_error("getsockname failed for %s:%s",cptr);
(void)close(cptr->fd);
return -1;
}
if (cptr == &me) /* KLUDGE to get it work... */
{
char buf[1024];
#ifdef TESTNET
(void)sprintf(buf, rpl_str(RPL_MYPORTIS), me.name, "*",
ntohs(server.sin_port) - 10000);
#else
(void)sprintf(buf, rpl_str(RPL_MYPORTIS), me.name, "*",
ntohs(server.sin_port));
#endif
(void)write(0, buf, strlen(buf));
}
if (cptr->fd > highest_fd)
highest_fd = cptr->fd;
cptr->ip.s_addr = inet_addr(ipname);
#ifdef TESTNET
cptr->port = (int)ntohs(server.sin_port) - 10000;
#else
cptr->port = (int)ntohs(server.sin_port);
#endif
(void)listen(cptr->fd, 5);
local[cptr->fd] = cptr;
return 0;
}
/*
* add_listener
*
* Create a new client which is essentially the stub like 'me' to be used
* for a socket that is passive (listen'ing for connections to be accepted).
*/
int add_listener(aconf)
aConfItem *aconf;
{
aClient *cptr;
cptr = make_client(NULL);
cptr->flags = FLAGS_LISTEN;
cptr->acpt = cptr;
cptr->from = cptr;
SetMe(cptr);
strncpyzt(cptr->name, aconf->host, sizeof(cptr->name));
#ifdef UNIXPORT
if (*aconf->host == '/')
{
if (unixport(cptr, aconf->host, aconf->port))
cptr->fd = -2;
}
else
#endif
if (inetport(cptr, aconf->host, aconf->port))
cptr->fd = -2;
if (cptr->fd >= 0)
{
cptr->confs = make_link();
cptr->confs->next = NULL;
cptr->confs->value.aconf = aconf;
set_non_blocking(cptr->fd, cptr);
}
else
free_client(cptr);
return 0;
}
#ifdef UNIXPORT
/*
* unixport
*
* Create a socket and bind it to a filename which is comprised of the path
* (directory where file is placed) and port (actual filename created).
* Set directory permissions as rwxr-xr-x so other users can connect to the
* file which is 'forced' to rwxrwxrwx (different OS's have different need of
* modes so users can connect to the socket).
*/
int unixport(cptr, path, port)
aClient *cptr;
char *path;
int port;
{
struct sockaddr_un un;
(void)alarm(2);
cptr->fd = socket(AF_UNIX, SOCK_STREAM, 0);
(void)alarm(0);
if (cptr->fd == -1 && errno == EAGAIN)
{
sendto_ops(
"error opening unix domain socket %s: No more sockets",
get_client_name(cptr,TRUE));
return -1;
}
if (cptr->fd == -1)
{
report_error("error opening unix domain socket %s:%s", cptr);
return -1;
}
else if (cptr->fd >= MAXCLIENTS)
{
sendto_ops("No more connections allowed (%s)", cptr->name);
(void)close(cptr->fd);
return -1;
}
un.sun_family = AF_UNIX;
(void)mkdir(path, 0755);
(void)sprintf(unixpath, "%s/%d", path, port);
(void)unlink(unixpath);
strncpyzt(un.sun_path, unixpath, sizeof(un.sun_path));
(void)strcpy(cptr->name, me.name);
errno = 0;
get_sockhost(cptr, unixpath);
if (bind(cptr->fd, (struct sockaddr *)&un, strlen(unixpath)+2) == -1)
{
report_error("error binding unix socket %s:%s", cptr);
(void)close(cptr->fd);
return -1;
}
if (cptr->fd > highest_fd)
highest_fd = cptr->fd;
(void)listen(cptr->fd, 5);
(void)chmod(path, 0755);
(void)chmod(unixpath, 0777);
cptr->flags |= FLAGS_UNIX;
cptr->port = 0;
local[cptr->fd] = cptr;
return 0;
}
#endif
/*
* close_listeners
*
* Close and free all clients which are marked as having their socket open
* and in a state where they can accept connections. Unix sockets have
* the path to the socket unlinked for cleanliness.
*/
void close_listeners()
{
Reg1 aClient *cptr;
Reg2 int i;
Reg3 aConfItem *aconf;
/*
* close all 'extra' listening ports we have and unlink the file
* name if it was a unix socket.
*/
for (i = highest_fd; i >= 0; i--)
{
if (!(cptr = local[i]))
continue;
if (!IsMe(cptr) || cptr == &me || !IsListening(cptr))
continue;
aconf = cptr->confs->value.aconf;
if (IsIllegal(aconf) && aconf->clients == 0)
{
#ifdef UNIXPORT
if (IsUnixSocket(cptr))
{
(void)sprintf(unixpath, "%s/%d", aconf->host,
aconf->port);
(void)unlink(unixpath);
}
#endif
close_connection(cptr);
}
}
}
/*
* init_sys
*/
void init_sys()
{
Reg1 int fd;
#ifdef RLIMIT_FD_MAX
struct rlimit limit;
if (!getrlimit(RLIMIT_FD_MAX, &limit))
{
# ifdef pyr
if (limit.rlim_cur < MAXCONNECTIONS)
#else
if (limit.rlim_max < MAXCONNECTIONS)
# endif
{
(void)fprintf(stderr,"ircd fd table too big\n");
(void)fprintf(stderr,"Hard Limit: %lu IRC max: %d\n",
limit.rlim_max, MAXCONNECTIONS);
(void)fprintf(stderr,"Fix MAXCONNECTIONS\n");
exit(-1);
}
# ifndef pyr
limit.rlim_cur = limit.rlim_max; /* make soft limit the max */
if (setrlimit(RLIMIT_FD_MAX, &limit) == -1)
{
(void)fprintf(stderr,"error setting max fd's to %lu\n",
limit.rlim_cur);
exit(-1);
}
# endif
}
#endif
#ifdef sequent
# ifndef DYNIXPTX
int fd_limit;
fd_limit = setdtablesize(MAXCONNECTIONS + 1);
if (fd_limit < MAXCONNECTIONS)
{
(void)fprintf(stderr,"ircd fd table too big\n");
(void)fprintf(stderr,"Hard Limit: %d IRC max: %d\n",
fd_limit, MAXCONNECTIONS);
(void)fprintf(stderr,"Fix MAXCONNECTIONS\n");
exit(-1);
}
# endif
#endif
#if defined(PCS) || defined(DYNIXPTX) || defined(SVR3)
char logbuf[BUFSIZ];
(void)setvbuf(stderr,logbuf,_IOLBF,sizeof(logbuf));
#else
# if defined(HPUX)
(void)setvbuf(stderr, NULL, _IOLBF, 0);
# else
# if !defined(SOL20)
(void)setlinebuf(stderr);
# endif
# endif
#endif
for (fd = 3; fd < MAXCONNECTIONS; fd++)
{
(void)close(fd);
local[fd] = NULL;
}
local[1] = NULL;
(void)close(1);
if (bootopt & BOOT_TTY) /* debugging is going to a tty */
goto init_dgram;
if (!(bootopt & BOOT_DEBUG))
(void)close(2);
if (((bootopt & BOOT_CONSOLE) || isatty(0)) &&
!(bootopt & (BOOT_INETD|BOOT_OPER)))
{
if (fork())
exit(0);
#ifdef TIOCNOTTY
if ((fd = open("/dev/tty", O_RDWR)) >= 0)
{
(void)ioctl(fd, TIOCNOTTY, (char *)NULL);
(void)close(fd);
}
#endif
#if defined(HPUX) || defined(SOL20) || defined(DYNIXPTX) || \
defined(_POSIX_SOURCE) || defined(SVR4)
(void)setsid();
#else
(void)setpgrp(0, (int)getpid());
#endif
(void)close(0); /* fd 0 opened by inetd */
local[0] = NULL;
}
init_dgram:
resfd = init_resolver(0x1f);
return;
}
void write_pidfile()
{
#ifdef IRCD_PIDFILE
int fd;
char buff[20];
if ((fd = open(IRCD_PIDFILE, O_CREAT|O_WRONLY, 0600))>=0)
{
bzero(buff, sizeof(buff));
(void)sprintf(buff,"%5d\n", (int)getpid());
if (write(fd, buff, strlen(buff)) == -1)
Debug((DEBUG_NOTICE,"Error writing to pid file %s",
IRCD_PIDFILE));
(void)close(fd);
return;
}
#ifdef DEBUGMODE
else
Debug((DEBUG_NOTICE,"Error opening pid file %s",
IRCD_PIDFILE));
#endif
#endif
}
/*
* Initialize the various name strings used to store hostnames. This is set
* from either the server's sockhost (if client fd is a tty or localhost)
* or from the ip# converted into a string. 0 = success, -1 = fail.
*/
static int check_init(cptr, sockn)
Reg1 aClient *cptr;
Reg2 char *sockn;
{
struct sockaddr_in sk;
socklen_t len = sizeof(struct sockaddr_in);
#ifdef UNIXPORT
if (IsUnixSocket(cptr))
{
strncpyzt(sockn, cptr->acpt->sockhost, HOSTLEN+1);
get_sockhost(cptr, sockn);
return 0;
}
#endif
/* If descriptor is a tty, special checking... */
if (isatty(cptr->fd))
{
strncpyzt(sockn, me.sockhost, HOSTLEN);
bzero((char *)&sk, sizeof(struct sockaddr_in));
}
else if (getpeername(cptr->fd, (struct sockaddr *)&sk, &len) == -1)
{
report_error("connect failure: %s %s", cptr);
return -1;
}
(void)strcpy(sockn, (char *)inetntoa((char *)&sk.sin_addr));
if (inet_netof(sk.sin_addr) == IN_LOOPBACKNET)
{
cptr->hostp = NULL;
strncpyzt(sockn, me.sockhost, HOSTLEN);
}
bcopy((char *)&sk.sin_addr, (char *)&cptr->ip,
sizeof(struct in_addr));
#ifdef TESTNET
cptr->port = (int)ntohs(sk.sin_port) - 10000;
#else
cptr->port = (int)ntohs(sk.sin_port);
#endif
return 0;
}
/*
* Ordinary client access check. Look for conf lines which have the same
* status as the flags passed.
* 0 = Success
* -1 = Access denied
* -2 = Bad socket.
*/
int check_client(cptr)
Reg1 aClient *cptr;
{
static char sockname[HOSTLEN+1];
Reg2 struct hostent *hp = NULL;
Reg3 int i;
ClearAccess(cptr);
Debug((DEBUG_DNS, "ch_cl: check access for %s[%s]",
cptr->name, inetntoa((char *)&cptr->ip)));
if (check_init(cptr, sockname))
return -2;
if (!IsUnixSocket(cptr))
hp = cptr->hostp;
/*
* Verify that the host to ip mapping is correct both ways and that
* the ip#(s) for the socket is listed for the host.
*/
if (hp)
{
for (i = 0; hp->h_addr_list[i]; i++)
if (!bcmp(hp->h_addr_list[i], (char *)&cptr->ip,
sizeof(struct in_addr)))
break;
if (!hp->h_addr_list[i])
{
sendto_ops("IP# Mismatch: %s != %s[%08x]",
inetntoa((char *)&cptr->ip), hp->h_name,
*((unsigned long *)hp->h_addr));
hp = NULL;
}
}
if ((i = attach_Iline(cptr, hp, sockname)))
{
Debug((DEBUG_DNS,"ch_cl: access denied: %s[%s]",
cptr->name, sockname));
return i;
}
Debug((DEBUG_DNS, "ch_cl: access ok: %s[%s]",
cptr->name, sockname));
if (inet_netof(cptr->ip) == IN_LOOPBACKNET || IsUnixSocket(cptr) ||
inet_netof(cptr->ip) == inet_netof(mysk.sin_addr))
{
ircstp->is_loc++;
cptr->flags |= FLAGS_LOCAL;
}
return 0;
}
#define CFLAG CONF_CONNECT_SERVER
#define NFLAG CONF_NOCONNECT_SERVER
/*
* check_server_init(), check_server()
* check access for a server given its name (passed in cptr struct).
* Must check for all C/N lines which have a name which matches the
* name given and a host which matches. A host alias which is the
* same as the server name is also acceptable in the host field of a
* C/N line.
* 0 = Success
* -1 = Access denied
* -2 = Bad socket.
*/
int check_server_init(cptr)
aClient *cptr;
{
Reg1 char *name;
Reg2 aConfItem *c_conf = NULL, *n_conf = NULL;
struct hostent *hp = NULL;
Link *lp;
name = cptr->name;
Debug((DEBUG_DNS, "sv_cl: check access for %s[%s]",
name, cptr->sockhost));
if (IsUnknown(cptr) && !attach_confs(cptr, name, CFLAG|NFLAG))
{
Debug((DEBUG_DNS,"No C/N lines for %s", name));
return -1;
}
lp = cptr->confs;
/*
* We initiated this connection so the client should have a C and N
* line already attached after passing through the connec_server()
* function earlier.
*/
if (IsConnecting(cptr) || IsHandshake(cptr))
{
c_conf = find_conf(lp, name, CFLAG);
n_conf = find_conf(lp, name, NFLAG);
if (!c_conf || !n_conf)
{
sendto_ops("Connecting Error: %s[%s]", name,
cptr->sockhost);
det_confs_butmask(cptr, 0);
return -1;
}
}
#ifdef UNIXPORT
if (IsUnixSocket(cptr))
{
if (!c_conf)
c_conf = find_conf(lp, name, CFLAG);
if (!n_conf)
n_conf = find_conf(lp, name, NFLAG);
}
#endif
/*
** If the servername is a hostname, either an alias (CNAME) or
** real name, then check with it as the host. Use gethostbyname()
** to check for servername as hostname.
*/
if (!IsUnixSocket(cptr) && !cptr->hostp)
{
Reg1 aConfItem *aconf;
aconf = count_cnlines(lp);
if (aconf)
{
Reg1 char *s;
Link lin;
/*
** Do a lookup for the CONF line *only* and not
** the server connection else we get stuck in a
** nasty state since it takes a SERVER message to
** get us here and we cant interrupt that very
** well.
*/
ClearAccess(cptr);
lin.value.aconf = aconf;
lin.flags = ASYNC_CONF;
nextdnscheck = 1;
if ((s = index(aconf->host, '@')))
s++;
else
s = aconf->host;
Debug((DEBUG_DNS,"sv_ci:cache lookup (%s)",s));
hp = gethost_byname(s, &lin);
}
}
return check_server(cptr, hp, c_conf, n_conf);
}
int check_server(cptr, hp, c_conf, n_conf)
aClient *cptr;
Reg1 aConfItem *n_conf, *c_conf;
Reg2 struct hostent *hp;
{
Reg3 const char *name;
char abuff[HOSTLEN+USERLEN+2];
char sockname[HOSTLEN+1], fullname[HOSTLEN+1];
Link *lp = cptr->confs;
int i;
ClearAccess(cptr);
if (check_init(cptr, sockname))
return -2;
check_serverback:
if (hp)
{
for (i = 0; hp->h_addr_list[i]; i++)
if (!bcmp(hp->h_addr_list[i], (char *)&cptr->ip,
sizeof(struct in_addr)))
break;
if (!hp->h_addr_list[i])
{
sendto_ops("IP# Mismatch: %s != %s[%08x]",
inetntoa((char *)&cptr->ip), hp->h_name,
*((unsigned long *)hp->h_addr));
hp = NULL;
}
}
else if (cptr->hostp)
{
hp = cptr->hostp;
goto check_serverback;
}
if (hp)
/*
* if we are missing a C or N line from above, search for
* it under all known hostnames we have for this ip#.
*/
for (i=0,name = hp->h_name; name ; name = hp->h_aliases[i++])
{
strncpyzt(fullname, name, sizeof(fullname));
add_local_domain(fullname, HOSTLEN-strlen(fullname));
Debug((DEBUG_DNS, "sv_cl: gethostbyaddr: %s->%s",
sockname, fullname));
(void)sprintf(abuff, "%s@%s",
cptr->username, fullname);
if (!c_conf)
c_conf = find_conf_host(lp, abuff, CFLAG);
if (!n_conf)
n_conf = find_conf_host(lp, abuff, NFLAG);
if (c_conf && n_conf)
{
get_sockhost(cptr, fullname);
break;
}
}
name = cptr->name;
/*
* Check for C and N lines with the hostname portion the ip number
* of the host the server runs on. This also checks the case where
* there is a server connecting from 'localhost'.
*/
if (IsUnknown(cptr) && (!c_conf || !n_conf))
{
(void)sprintf(abuff, "%s@%s", cptr->username, sockname);
if (!c_conf)
c_conf = find_conf_host(lp, abuff, CFLAG);
if (!n_conf)
n_conf = find_conf_host(lp, abuff, NFLAG);
}
/*
* Attach by IP# only if all other checks have failed.
* It is quite possible to get here with the strange things that can
* happen when using DNS in the way the irc server does. -avalon
*/
if (!hp)
{
if (!c_conf)
c_conf = find_conf_ip(lp, (char *)&cptr->ip,
cptr->username, CFLAG);
if (!n_conf)
n_conf = find_conf_ip(lp, (char *)&cptr->ip,
cptr->username, NFLAG);
}
else
for (i = 0; hp->h_addr_list[i]; i++)
{
if (!c_conf)
c_conf = find_conf_ip(lp, hp->h_addr_list[i],
cptr->username, CFLAG);
if (!n_conf)
n_conf = find_conf_ip(lp, hp->h_addr_list[i],
cptr->username, NFLAG);
}
/*
* detach all conf lines that got attached by attach_confs()
*/
det_confs_butmask(cptr, 0);
/*
* if no C or no N lines, then deny access
*/
if (!c_conf || !n_conf)
{
get_sockhost(cptr, sockname);
Debug((DEBUG_DNS, "sv_cl: access denied: %s[%s@%s] c %x n %x",
name, cptr->username, cptr->sockhost,
c_conf, n_conf));
return -1;
}
/*
* attach the C and N lines to the client structure for later use.
*/
(void)attach_conf(cptr, n_conf);
(void)attach_conf(cptr, c_conf);
(void)attach_confs(cptr, name, CONF_HUB|CONF_LEAF|CONF_UWORLD);
if ((c_conf->ipnum.s_addr == -1) && !IsUnixSocket(cptr))
bcopy((char *)&cptr->ip, (char *)&c_conf->ipnum,
sizeof(struct in_addr));
if (!IsUnixSocket(cptr))
get_sockhost(cptr, c_conf->host);
Debug((DEBUG_DNS,"sv_cl: access ok: %s[%s]",
name, cptr->sockhost));
return 0;
}
#undef CFLAG
#undef NFLAG
/*
** 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(cptr)
aClient *cptr;
{
aConfItem *aconf;
time_t newts;
aClient *acptr;
int i;
aconf = find_conf(cptr->confs, cptr->name, CONF_CONNECT_SERVER);
if (!aconf)
{
sendto_ops("Lost C-Line for %s", get_client_name(cptr,FALSE));
return -1;
}
if (!BadPtr(aconf->passwd))
sendto_one(cptr, "PASS :%s", aconf->passwd);
aconf = find_conf(cptr->confs, cptr->name, CONF_NOCONNECT_SERVER);
if (!aconf)
{
sendto_ops("Lost N-Line for %s", get_client_name(cptr,FALSE));
return -1;
}
make_server(cptr);
/* Create a unique timestamp */
newts = TStime();
for (i = highest_fd; i >= 0; i--)
{
if (!(acptr = local[i]) || (!IsServer(acptr) && !IsHandshake(acptr)))
continue;
if (acptr->serv->timestamp >= newts)
newts = acptr->serv->timestamp + 1;
}
cptr->serv->timestamp = newts;
SetHandshake(cptr);
/* Make us timeout after twice the timeout for DNS look ups */
cptr->lasttime = now;
cptr->flags |= FLAGS_PINGSENT;
sendto_one(cptr, "SERVER %s 1 %lu %lu J%s :%s",
my_name_for_link(me.name, aconf), me.serv->timestamp,
newts, MAJOR_PROTOCOL, me.info);
if (!IsDead(cptr))
start_auth(cptr);
return (IsDead(cptr)) ? -1 : 0;
}
/*
** close_connection
** Close the physical connection. This function must make
** MyConnect(cptr) == FALSE, and set cptr->from == NULL.
*/
void close_connection(cptr)
aClient *cptr;
{
Reg1 aConfItem *aconf;
Reg2 int i,j;
int empty = cptr->fd;
if (IsServer(cptr))
{
ircstp->is_sv++;
ircstp->is_sbs += cptr->sendB;
ircstp->is_sbr += cptr->receiveB;
ircstp->is_sks += cptr->sendK;
ircstp->is_skr += cptr->receiveK;
ircstp->is_sti += now - cptr->firsttime;
if (ircstp->is_sbs > 1023)
{
ircstp->is_sks += (ircstp->is_sbs >> 10);
ircstp->is_sbs &= 0x3ff;
}
if (ircstp->is_sbr > 1023)
{
ircstp->is_skr += (ircstp->is_sbr >> 10);
ircstp->is_sbr &= 0x3ff;
}
}
else if (IsClient(cptr))
{
ircstp->is_cl++;
ircstp->is_cbs += cptr->sendB;
ircstp->is_cbr += cptr->receiveB;
ircstp->is_cks += cptr->sendK;
ircstp->is_ckr += cptr->receiveK;
ircstp->is_cti += now - cptr->firsttime;
if (ircstp->is_cbs > 1023)
{
ircstp->is_cks += (ircstp->is_cbs >> 10);
ircstp->is_cbs &= 0x3ff;
}
if (ircstp->is_cbr > 1023)
{
ircstp->is_ckr += (ircstp->is_cbr >> 10);
ircstp->is_cbr &= 0x3ff;
}
}
else
ircstp->is_ni++;
/*
* remove outstanding DNS queries.
*/
del_queries((char *)cptr);
/*
* 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(cptr->name, cptr->username,
cptr->sockhost, CONF_CONNECT_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 = now;
aconf->hold += (aconf->hold - cptr->since > HANGONGOODLINK) ?
HANGONRETRYDELAY : ConfConFreq(aconf);
if (nextconnect > aconf->hold)
nextconnect = aconf->hold;
}
if (cptr->authfd >= 0)
(void)close(cptr->authfd);
if (cptr->fd >= 0)
{
flush_connections(cptr->fd);
local[cptr->fd] = NULL;
(void)close(cptr->fd);
cptr->fd = -2;
DBufClear(&cptr->sendQ);
DBufClear(&cptr->recvQ);
bzero(cptr->passwd, sizeof(cptr->passwd));
/*
* clean up extra sockets from P-lines which have been
* discarded.
*/
if (cptr->acpt != &me && cptr->acpt != cptr)
{
aconf = cptr->acpt->confs->value.aconf;
if (aconf->clients > 0)
aconf->clients--;
if (!aconf->clients && IsIllegal(aconf))
close_connection(cptr->acpt);
}
}
for (; highest_fd > 0; highest_fd--)
if (local[highest_fd])
break;
det_confs_butmask(cptr, 0);
cptr->from = NULL; /* ...this should catch them! >:) --msa */
/*
* fd remap to keep local[i] filled at the bottom.
*/
if (empty > 0)
if ((j = highest_fd) > (i = empty) &&
(local[j]->status != STAT_LOG))
{
if (dup2(j,i) == -1)
return;
local[i] = local[j];
local[i]->fd = i;
local[j] = NULL;
(void)close(j);
while (!local[highest_fd])
highest_fd--;
}
return;
}
/*
** set_sock_opts
*/
static void set_sock_opts(fd, cptr)
int fd;
aClient *cptr;
{
socklen_t opt;
#ifdef SO_REUSEADDR
opt = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (OPT_TYPE *)&opt, sizeof(opt)) < 0)
report_error("setsockopt(SO_REUSEADDR) %s:%s", cptr);
#endif
#if defined(SO_DEBUG) && defined(DEBUGMODE) && 0
/* Solaris with SO_DEBUG writes to syslog by default */
#if !defined(SOL20) || defined(USE_SYSLOG)
opt = 1;
if (setsockopt(fd, SOL_SOCKET, SO_DEBUG, (OPT_TYPE *)&opt, sizeof(opt)) < 0)
report_error("setsockopt(SO_DEBUG) %s:%s", cptr);
#endif /* SOL20 */
#endif
#ifdef SO_USELOOPBACK
opt = 1;
if (setsockopt(fd, SOL_SOCKET, SO_USELOOPBACK, (OPT_TYPE *)&opt, sizeof(opt)) < 0)
report_error("setsockopt(SO_USELOOPBACK) %s:%s", cptr);
#endif
#ifdef SO_RCVBUF
opt = 8192;
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (OPT_TYPE *)&opt, sizeof(opt)) < 0)
report_error("setsockopt(SO_RCVBUF) %s:%s", cptr);
#endif
#ifdef SO_SNDBUF
# ifdef _SEQUENT_
/* seems that Sequent freezes up if the receving buffer is a different size
* to the sending buffer (maybe a tcp window problem too).
*/
opt = 8192;
# else
opt = 8192;
# endif
if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (OPT_TYPE *)&opt, sizeof(opt)) < 0)
report_error("setsockopt(SO_SNDBUF) %s:%s", cptr);
#endif
#if defined(IP_OPTIONS) && defined(IPPROTO_IP)
{
char *s = readbuf, *t = readbuf + sizeof(readbuf) / 2;
opt = sizeof(readbuf) / 8;
if (getsockopt(fd, IPPROTO_IP, IP_OPTIONS, (OPT_TYPE *)t, &opt) < 0)
report_error("getsockopt(IP_OPTIONS) %s:%s", cptr);
else if (opt > 0 && opt != sizeof(readbuf) / 8)
{
for (*readbuf = '\0'; opt > 0; opt--, s+= 3)
(void)sprintf(s, "%02x:", *t++);
*s = '\0';
sendto_ops("Connection %s using IP opts: (%s)",
get_client_name(cptr, TRUE), readbuf);
}
if (setsockopt(fd, IPPROTO_IP, IP_OPTIONS, (OPT_TYPE *)NULL, 0) < 0)
report_error("setsockopt(IP_OPTIONS) %s:%s", cptr);
}
#endif
}
int get_sockerr(cptr)
aClient *cptr;
{
int errtmp = errno, err = 0;
socklen_t len = sizeof(err);
#ifdef SO_ERROR
if (cptr->fd >= 0)
if (!getsockopt(cptr->fd, SOL_SOCKET, SO_ERROR, (OPT_TYPE *)&err, &len))
if (err)
errtmp = err;
#endif
return errtmp;
}
/*
** set_non_blocking
** Set the client connection into non-blocking mode. If your
** system doesn't support this, you can make this a dummy
** function (and get all the old problems that plagued the
** blocking version of IRC--not a problem if you are a
** lightly loaded node...)
*/
void set_non_blocking(fd, cptr)
int fd;
aClient *cptr;
{
int res, nonb = 0;
/*
** NOTE: consult ALL your relevant manual pages *BEFORE* changing
** these ioctl's. There are quite a few variations on them,
** as can be seen by the PCS one. They are *NOT* all the same.
** Heed this well. - Avalon.
*/
#ifdef NBLOCK_POSIX
nonb |= O_NONBLOCK;
#endif
#ifdef NBLOCK_BSD
nonb |= O_NDELAY;
#endif
#ifdef NBLOCK_SYSV
/* This portion of code might also apply to NeXT. -LynX */
res = 1;
if (ioctl (fd, FIONBIO, &res) < 0)
report_error("ioctl(fd,FIONBIO) failed for %s:%s", cptr);
#else
if ((res = fcntl(fd, F_GETFL, 0)) == -1)
report_error("fcntl(fd, F_GETFL) failed for %s:%s",cptr);
else if (fcntl(fd, F_SETFL, res | nonb) == -1)
report_error("fcntl(fd, F_SETL, nonb) failed for %s:%s",cptr);
#endif
return;
}
/*
* 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 added to the linked list of clients but isnt added to any
* hash tables yuet since it doesnt have a name.
*/
aClient *add_connection(cptr, fd)
aClient *cptr;
int fd;
{
Link lin;
aClient *acptr;
aConfItem *aconf = NULL;
acptr = make_client(NULL);
if (cptr != &me)
aconf = cptr->confs->value.aconf;
/* 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 (isatty(fd)) /* If descriptor is a tty, special checking... */
get_sockhost(acptr, cptr->sockhost);
else
{
Reg1 char *s, *t;
struct sockaddr_in addr;
socklen_t len = sizeof(struct sockaddr_in);
if (getpeername(fd, (struct sockaddr *) &addr, &len) == -1)
{
report_error("Failed in connecting to %s :%s", cptr);
add_con_refuse:
ircstp->is_ref++;
acptr->fd = -2;
free_client(acptr);
(void)close(fd);
return NULL;
}
/* don't want to add "Failed in connecting to" here.. */
if (aconf && IsIllegal(aconf))
goto add_con_refuse;
/* Copy ascii address to 'sockhost' just in case. Then we
* have something valid to put into error messages...
*/
get_sockhost(acptr, (char *)inetntoa((char *)&addr.sin_addr));
bcopy ((char *)&addr.sin_addr, (char *)&acptr->ip,
sizeof(struct in_addr));
#ifdef TESTNET
acptr->port = ntohs(addr.sin_port) - 10000;
#else
acptr->port = ntohs(addr.sin_port);
#endif
/*
* Check that this socket (client) is allowed to accept
* connections from this IP#.
*/
for (s = (char *)&cptr->ip, t = (char *)&acptr->ip, len = 4;
len > 0; len--, s++, t++)
{
if (!*s)
continue;
if (*s != *t)
break;
}
if (len)
goto add_con_refuse;
lin.flags = ASYNC_CLIENT;
lin.value.cptr = acptr;
Debug((DEBUG_DNS, "lookup %s",
inetntoa((char *)&addr.sin_addr)));
acptr->hostp = gethost_byaddr(&acptr->ip, &lin);
if (!acptr->hostp)
SetDNS(acptr);
nextdnscheck = 1;
}
if (aconf)
aconf->clients++;
acptr->fd = fd;
if (fd > highest_fd)
highest_fd = fd;
local[fd] = acptr;
acptr->acpt = cptr;
add_client_to_list(acptr);
set_non_blocking(acptr->fd, acptr);
set_sock_opts(acptr->fd, acptr);
start_auth(acptr);
return acptr;
}
#ifdef UNIXPORT
static void add_unixconnection(cptr, fd)
aClient *cptr;
int fd;
{
aClient *acptr;
aConfItem *aconf = NULL;
acptr = make_client(NULL);
/* Copy ascii address to 'sockhost' just in case. Then we
* have something valid to put into error messages...
*/
get_sockhost(acptr, me.sockhost);
if (cptr != &me)
aconf = cptr->confs->value.aconf;
if (aconf)
{
if (IsIllegal(aconf))
{
ircstp->is_ref++;
acptr->fd = -2;
free_client(acptr);
(void)close(fd);
return;
}
else
aconf->clients++;
}
acptr->fd = fd;
if (fd > highest_fd)
highest_fd = fd;
local[fd] = acptr;
acptr->acpt = cptr;
SetUnixSock(acptr);
bcopy((char *)&me.ip, (char *)&acptr->ip, sizeof(struct in_addr));
add_client_to_list(acptr);
set_non_blocking(acptr->fd, acptr);
set_sock_opts(acptr->fd, acptr);
SetAccess(acptr);
return;
}
#endif
/*
** 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(cptr, rfd)
Reg1 aClient *cptr;
fd_set *rfd;
{
Reg1 int dolen = 0, length = 0, done;
if (FD_ISSET(cptr->fd, rfd) &&
!(IsPerson(cptr) && DBufLength(&cptr->recvQ) > 6090))
{
errno = 0;
length = recv(cptr->fd, readbuf, sizeof(readbuf), 0);
cptr->lasttime = now;
if (cptr->lasttime > cptr->since)
cptr->since = cptr->lasttime;
cptr->flags &= ~(FLAGS_PINGSENT|FLAGS_NONL);
/*
* If not ready, fake it so it isnt closed
*/
if (length == -1 &&
((errno == EWOULDBLOCK) || (errno == EAGAIN)))
return 1;
if (length <= 0)
return length;
}
/*
** For server connections, we process as many as we can without
** worrying about the time of day or anything :)
*/
if (IsServer(cptr) || IsConnecting(cptr) || IsHandshake(cptr) ||
IsService(cptr))
{
if (length > 0)
if ((done = dopacket(cptr, readbuf, length)))
return done;
}
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 (dbuf_put(&cptr->recvQ, readbuf, length) < 0)
return exit_client(cptr, cptr, &me, "dbuf_put fail");
if (IsPerson(cptr) &&
DBufLength(&cptr->recvQ) > CLIENT_FLOOD)
return exit_client(cptr, cptr, &me, "Excess Flood");
while (DBufLength(&cptr->recvQ) && !NoNewLine(cptr) &&
((cptr->status < STAT_UNKNOWN) ||
(cptr->since - now < 10)))
{
/*
** If it has become registered as a Service or Server
** then skip the per-message parsing below.
*/
if (IsService(cptr) || IsServer(cptr))
{
dolen = dbuf_get(&cptr->recvQ, readbuf,
sizeof(readbuf));
if (dolen <= 0)
break;
if ((done = dopacket(cptr, readbuf, dolen)))
return done;
break;
}
dolen = dbuf_getmsg(&cptr->recvQ, readbuf,
sizeof(readbuf));
/*
** 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
*/
while (dolen <= 0)
{
if (dolen < 0)
return exit_client(cptr, cptr, &me,
"dbuf_getmsg fail");
if (DBufLength(&cptr->recvQ) < 510)
{
cptr->flags |= FLAGS_NONL;
break;
}
dolen = dbuf_get(&cptr->recvQ, readbuf, 511);
if (dolen > 0 && DBufLength(&cptr->recvQ))
DBufClear(&cptr->recvQ);
}
if (dolen > 0 &&
(dopacket(cptr, readbuf, dolen) == CPTR_KILLED))
return CPTR_KILLED;
}
}
return 1;
}
/*
* Check all connections for new connections and input data that is to be
* processed. Also check for connections with data queued and whether we can
* write it out.
*/
int read_message(delay)
time_t delay; /* Don't ever use ZERO here, unless you mean to poll and then
* you have to have sleep/wait somewhere else in the code.--msa
*/
{
Reg1 aClient *cptr;
Reg2 int nfds;
struct timeval wait;
#ifdef pyr
struct timeval nowt;
u_long us;
#endif
fd_set read_set, write_set;
time_t delay2 = delay;
u_long usec = 0;
int res, length, fd, i;
int auth = 0, ping = 0;
#ifdef NPATH
note_delay(&delay);
#endif
#ifdef pyr
(void) gettimeofday(&nowt, NULL);
now = nowt.tv_sec;
#endif
for (res = 0;;)
{
FD_ZERO(&read_set);
FD_ZERO(&write_set);
for (i = highest_fd; i >= 0; i--)
{
if (!(cptr = local[i]))
continue;
if (IsLog(cptr))
continue;
if (DoingAuth(cptr))
{
auth++;
Debug((DEBUG_NOTICE,"auth on %x %d", cptr, i));
FD_SET(cptr->authfd, &read_set);
if (cptr->flags & FLAGS_WRAUTH)
FD_SET(cptr->authfd, &write_set);
}
if (IsPing(cptr))
{
ping++;
Debug((DEBUG_NOTICE,"open ping on %x %d",
cptr, i));
FD_SET(i, &read_set);
if (DoPing(cptr))
{
delay2 = 1;
if (now > cptr->lasttime)
FD_SET(i, &write_set);
}
else if (cptr->firsttime &&
now > cptr->firsttime)
{
FD_CLR(i, &read_set);
del_queries((char *)cptr);
end_ping(cptr);
}
continue;
}
if (DoingDNS(cptr) || DoingAuth(cptr))
continue;
if (IsMe(cptr) && IsListening(cptr))
{
if ((now > cptr->lasttime + 2))
FD_SET(i, &read_set);
else if (delay2 > 2)
delay2 = 2;
}
else if (!IsMe(cptr))
{
if (DBufLength(&cptr->recvQ) && delay2 > 2)
delay2 = 1;
if (DBufLength(&cptr->recvQ) < 4088)
FD_SET(i, &read_set);
}
if (DBufLength(&cptr->sendQ) || IsConnecting(cptr) ||
(cptr->listing && DBufLength(&cptr->sendQ) < 2048))
#ifndef pyr
FD_SET(i, &write_set);
#else
{
if (!(cptr->flags & FLAGS_BLOCKED))
FD_SET(i, &write_set);
else
delay2 = 0, usec = 500000;
}
if (now - cptr->lw.tv_sec &&
nowt.tv_usec - cptr->lw.tv_usec < 0)
us = 1000000;
else
us = 0;
us += nowt.tv_usec;
if (us - cptr->lw.tv_usec > 500000)
cptr->flags &= ~FLAGS_BLOCKED;
#endif
}
if (udpfd >= 0)
FD_SET(udpfd, &read_set);
if (resfd >= 0)
FD_SET(resfd, &read_set);
wait.tv_sec = MIN(delay2, delay);
wait.tv_usec = usec;
#ifdef HPUX
nfds = select(FD_SETSIZE, (int *)&read_set, (int *)&write_set,
0, &wait);
#else
nfds = select(FD_SETSIZE, &read_set, &write_set, 0, &wait);
#endif
now = time(NULL);
if (nfds == -1 && errno == EINTR)
return -1;
else if (nfds >= 0)
break;
report_error("select %s:%s", &me);
res++;
if (res > 5)
restart("too many select errors");
sleep(10);
now += 10;
}
if (udpfd >= 0 && FD_ISSET(udpfd, &read_set))
{
polludp();
nfds--;
FD_CLR(udpfd, &read_set);
}
/*
* Check fd sets for the ping fd's (if set and valid!) first
* because these can not be processed using the normal loops below.
* And we want them to be as fast as possible.
* -Run
*/
for (i = highest_fd; (ping > 0) && (i >= 0); i--)
{
if (!(cptr = local[i]))
continue;
if (!IsPing(cptr))
continue;
ping--;
if ((nfds > 0) && FD_ISSET(cptr->fd, &read_set))
{
nfds--;
FD_CLR(cptr->fd, &read_set);
read_ping(cptr); /* This can MyFree(cptr) ! */
}
else if ((nfds > 0) && FD_ISSET(cptr->fd, &write_set))
{
nfds--;
cptr->lasttime = now;
FD_CLR(cptr->fd, &write_set);
send_ping(cptr); /* This can MyFree(cptr) ! */
}
}
if (resfd >= 0 && FD_ISSET(resfd, &read_set))
{
do_dns_async();
nfds--;
FD_CLR(resfd, &read_set);
}
/*
* Check fd sets for the auth fd's (if set and valid!) first
* because these can not be processed using the normal loops below.
* -avalon
*/
for (i = highest_fd; (auth > 0) && (i >= 0); i--)
{
if (!(cptr = local[i]))
continue;
if (cptr->authfd < 0)
continue;
auth--;
if ((nfds > 0) && FD_ISSET(cptr->authfd, &write_set))
{
nfds--;
send_authports(cptr);
}
else if ((nfds > 0) && FD_ISSET(cptr->authfd, &read_set))
{
nfds--;
read_authports(cptr);
}
}
for (i = highest_fd; i >= 0; i--)
if ((cptr = local[i]) && FD_ISSET(i, &read_set) &&
IsListening(cptr))
{
FD_CLR(i, &read_set);
nfds--;
cptr->lasttime = now;
/*
** There may be many reasons for error return, but
** in otherwise correctly working environment the
** probable cause is running out of file descriptors
** (EMFILE, ENFILE or others?). The man pages for
** accept don't seem to list these as possible,
** although it's obvious that it may happen here.
** Thus no specific errors are tested at this
** point, just assume that connections cannot
** be accepted until some old is closed first.
*/
if ((fd = accept(i, NULL, NULL)) < 0)
{
if (errno == EAGAIN && IsListening(cptr))
{
cptr->confs->value.aconf->status =
CONF_ILLEGAL;
dorehash = 1;
sendto_ops("Cannot accept connections on %s"
": No more sockets",
get_client_name(cptr, TRUE));
}
else
report_error("Cannot accept connections%s: %s",
NULL);
break;
}
#if defined(USE_SYSLOG) && defined(SYSLOG_CONNECTS)
{ /* get an early log of all connections --dl */
static struct sockaddr_in peer;
static int len;
len = sizeof(peer);
getpeername(fd,(struct sockaddr *)&peer,&len);
syslog(LOG_DEBUG,"Conn: %s",
inetntoa((char*)&(peer.sin_addr)));
}
#endif
ircstp->is_ac++;
if (fd >= MAXCLIENTS)
{
ircstp->is_ref++;
sendto_ops("All connections in use. (%s)",
get_client_name(cptr, TRUE));
(void)send(fd,
"ERROR :All connections in use\r\n",
32, 0);
(void)close(fd);
break;
}
/*
* Use of add_connection (which never fails :) meLazy
*/
#ifdef UNIXPORT
if (IsUnixSocket(cptr))
add_unixconnection(cptr, fd);
else
#endif
(void)add_connection(cptr, fd);
nextping = now;
if (!cptr->acpt)
cptr->acpt = &me;
}
for (i = highest_fd; i >= 0; i--)
{
if (!(cptr = local[i]) || IsMe(cptr))
continue;
#ifdef DEBUGMODE
if (IsLog(cptr))
continue;
#endif
if (FD_ISSET(i, &write_set))
{
int write_err = 0;
nfds--;
/*
** ...room for writing, empty some queue then...
*/
cptr->flags &= ~FLAGS_BLOCKED;
if (IsConnecting(cptr))
write_err = completed_connection(cptr);
if (!write_err)
{
if (cptr->listing && DBufLength(&cptr->sendQ) < 2048)
list_next_channels(cptr, 64);
send_queued(cptr);
}
if (IsDead(cptr) || write_err)
{
deadsocket:
if (FD_ISSET(i, &read_set))
{
nfds--;
FD_CLR(i, &read_set);
}
(void)exit_client(cptr, cptr, &me,
IsDead(cptr) ?
last_dead_comment :
strerror(get_sockerr(cptr)));
continue;
}
}
length = 1; /* for fall through case */
if (!NoNewLine(cptr) || FD_ISSET(i, &read_set))
length = read_packet(cptr, &read_set);
if (length > 0)
flush_connections(i);
if ((length != CPTR_KILLED) && IsDead(cptr))
goto deadsocket;
if (!FD_ISSET(i, &read_set) && length > 0)
continue;
nfds--;
readcalls++;
if (length > 0)
continue;
/*
** ...hmm, with non-blocking sockets we might get
** here from quite valid reasons, although.. why
** would select report "data available" when there
** wasn't... so, this must be an error anyway... --msa
** actually, EOF occurs when read() returns 0 and
** in due course, select() returns that fd as ready
** for reading even though it ends up being an EOF. -avalon
*/
Debug((DEBUG_ERROR, "READ ERROR: fd = %d %d %d",
i, errno, length));
if (length == CPTR_KILLED)
continue;
if ((IsServer(cptr) || IsHandshake(cptr)) &&
errno == 0 && length == 0)
(void)exit_client_msg(cptr, cptr, &me,
"Server %s closed the connection",
get_client_name(cptr,FALSE));
else
(void)exit_client_msg(cptr, cptr, &me, "Read error to %s: %s",
get_client_name(cptr,FALSE), (length < 0) ?
strerror(get_sockerr(cptr)) : "EOF from client");
}
return 0;
}
/*
* connect_server
*/
int connect_server(aconf, by, hp)
aConfItem *aconf;
aClient *by;
struct hostent *hp;
{
Reg1 struct sockaddr *svp;
Reg2 aClient *cptr, *c2ptr;
Reg3 char *s;
int errtmp, len;
Debug((DEBUG_NOTICE,"Connect to %s[%s] @%s",
aconf->name, aconf->host, inetntoa((char *)&aconf->ipnum)));
if ((c2ptr = find_client(aconf->name, NULL)) ||
(c2ptr = find_server(aconf->name, NULL)))
{
if (IsServer(c2ptr) || IsMe(c2ptr))
{
sendto_ops("Server %s already present from %s",
aconf->name, c2ptr->from->name);
if (by && IsPerson(by) && !MyClient(by))
sendto_one(by,
":%s NOTICE %s :Server %s already present from %s",
me.name, by->name, aconf->name, c2ptr->from->name);
return -1;
}
else if (IsHandshake(c2ptr) || IsConnecting(c2ptr))
{
if (by && IsPerson(by))
sendto_one(by,
":%s NOTICE %s :Connection to %s already in progress",
me.name, by->name, get_client_name(c2ptr, TRUE));
return -1;
}
}
/*
* 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 ( ( !aconf->ipnum.s_addr )
#ifdef UNIXPORT
&& ( ( aconf->host[2] ) != '/' ) /* needed for Unix domain -- dl*/
#endif
)
{
Link lin;
lin.flags = ASYNC_CONNECT;
lin.value.aconf = aconf;
nextdnscheck = 1;
s = (char *)index(aconf->host, '@');
s++; /* should NEVER be NULL */
if ((aconf->ipnum.s_addr = inet_addr(s)) == -1)
{
aconf->ipnum.s_addr = 0;
hp = gethost_byname(s, &lin);
Debug((DEBUG_NOTICE, "co_sv: hp %x ac %x na %s ho %s",
hp, aconf, aconf->name, s));
if (!hp)
return 0;
bcopy(hp->h_addr, (char *)&aconf->ipnum,
sizeof(struct in_addr));
}
}
cptr = make_client(NULL);
cptr->hostp = hp;
/*
* Copy these in so we have something for error detection.
*/
strncpyzt(cptr->name, aconf->name, sizeof(cptr->name));
strncpyzt(cptr->sockhost, aconf->host, HOSTLEN+1);
#ifdef UNIXPORT
if (aconf->host[2] == '/') /* (/ starts a 2), Unix domain -- dl*/
svp = connect_unix(aconf, cptr, &len);
else
svp = connect_inet(aconf, cptr, &len);
#else
svp = connect_inet(aconf, cptr, &len);
#endif
if (!svp)
{
if (cptr->fd >= 0)
(void)close(cptr->fd);
cptr->fd = -2;
if (by && IsPerson(by) && !MyClient(by))
sendto_one(by,
":%s NOTICE %s :Couldn't connect to %s",
me.name, by->name, get_client_name(cptr, TRUE));
free_client(cptr);
return -1;
}
set_non_blocking(cptr->fd, cptr);
set_sock_opts(cptr->fd, cptr);
(void)signal(SIGALRM, dummy);
(void)alarm(4);
if (connect(cptr->fd, svp, len) < 0 && errno != EINPROGRESS)
{
int err = get_sockerr(cptr);
errtmp = errno; /* other system calls may eat errno */
(void)alarm(0);
report_error("Connect to host %s failed: %s",cptr);
if (by && IsPerson(by) && !MyClient(by))
sendto_one(by,
":%s NOTICE %s :Connect to host %s failed: %s",
me.name, by->name, get_client_name(cptr, TRUE),
strerror(err));
(void)close(cptr->fd);
cptr->fd = -2;
free_client(cptr);
errno = errtmp;
if (errno == EINTR)
errno = ETIMEDOUT;
return -1;
}
(void)alarm(0);
/* Attach config entries to client here rather than in
* completed_connection. This to avoid null pointer references
* when name returned by gethostbyaddr matches no C lines
* (could happen in 2.6.1a when host and servername differ).
* No need to check access and do gethostbyaddr calls.
* There must at least be one as we got here C line... meLazy
*/
(void)attach_confs_host(cptr, aconf->host,
CONF_NOCONNECT_SERVER | CONF_CONNECT_SERVER);
if (!find_conf_host(cptr->confs, aconf->host, CONF_NOCONNECT_SERVER) ||
!find_conf_host(cptr->confs, aconf->host, CONF_CONNECT_SERVER))
{
sendto_ops("Host %s is not enabled for connecting:no C/N-line",
aconf->host);
if (by && IsPerson(by) && !MyClient(by))
sendto_one(by,
":%s NOTICE %s :Connect to host %s failed: no C/N-lines",
me.name, by->name, get_client_name(cptr, TRUE));
det_confs_butmask(cptr, 0);
(void)close(cptr->fd);
cptr->fd = -2;
free_client(cptr);
return(-1);
}
/*
** The socket has been connected or connect is in progress.
*/
(void)make_server(cptr);
if (by && IsPerson(by))
{
(void)strcpy(cptr->serv->by, by->name);
if (cptr->serv->user) free_user(cptr->serv->user, NULL);
cptr->serv->user = by->user;
by->user->refcnt++;
}
else
{
(void)strcpy(cptr->serv->by, "AutoConn.");
if (cptr->serv->user) free_user(cptr->serv->user, NULL);
cptr->serv->user = NULL;
}
cptr->serv->up = &me;
if (cptr->fd > highest_fd)
highest_fd = cptr->fd;
local[cptr->fd] = cptr;
cptr->acpt = &me;
SetConnecting(cptr);
get_sockhost(cptr, aconf->host);
add_client_to_list(cptr);
(void)add_to_client_hash_table(cptr->name, cptr);
nextping = now;
return 0;
}
static struct sockaddr *connect_inet(aconf, cptr, lenp)
Reg1 aConfItem *aconf;
Reg2 aClient *cptr;
int *lenp;
{
static struct sockaddr_in server;
Reg3 struct hostent *hp;
/*
* Might as well get sockhost from here, the connection is attempted
* with it so if it fails its useless.
*/
(void)alarm(2);
cptr->fd = socket(AF_INET, SOCK_STREAM, 0);
(void)alarm(0);
if (cptr->fd == -1 && errno == EAGAIN)
{
sendto_ops(
"opening stream socket to server %s: No more sockets",
get_client_name(cptr,TRUE));
return NULL;
}
if (cptr->fd == -1)
{
report_error("opening stream socket to server %s:%s", cptr);
return NULL;
}
if (cptr->fd >= MAXCLIENTS)
{
sendto_ops("No more connections allowed (%s)", cptr->name);
return NULL;
}
mysk.sin_port = 0;
bzero((char *)&server, sizeof(server));
server.sin_family = AF_INET;
get_sockhost(cptr, aconf->host);
#ifdef VIRTUAL_HOST
mysk.sin_addr = vserv.sin_addr;
#endif
/*
** 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
*/
#ifdef VIRTUAL_HOST
/*
** 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 (bind(cptr->fd, (struct sockaddr *)&mysk, sizeof(mysk)) == -1)
{
report_error("error binding to local port for %s:%s", cptr);
return NULL;
}
#endif
/*
* By this point we should know the IP# of the host listed in the
* conf line, whether as a result of the hostname lookup or the ip#
* being present instead. If we dont know it, then the connect fails.
*/
if (isdigit(*aconf->host) && (aconf->ipnum.s_addr == -1))
aconf->ipnum.s_addr = inet_addr(aconf->host);
if (aconf->ipnum.s_addr == -1)
{
hp = cptr->hostp;
if (!hp)
{
Debug((DEBUG_FATAL, "%s: unknown host", aconf->host));
return NULL;
}
bcopy(hp->h_addr, (char *)&aconf->ipnum,
sizeof(struct in_addr));
}
bcopy((char *)&aconf->ipnum, (char *)&server.sin_addr,
sizeof(struct in_addr));
bcopy((char *)&aconf->ipnum, (char *)&cptr->ip,
sizeof(struct in_addr));
#ifdef TESTNET
server.sin_port = htons(((aconf->port > 0) ? aconf->port : portnum)
+ 10000);
#else
server.sin_port = htons(((aconf->port > 0) ? aconf->port : portnum));
#endif
*lenp = sizeof(server);
return (struct sockaddr *)&server;
}
#ifdef UNIXPORT
/* connect_unix
*
* Build a socket structure for cptr so that it can connet to the unix
* socket defined by the conf structure aconf.
*/
static struct sockaddr *connect_unix(aconf, cptr, lenp)
aConfItem *aconf;
aClient *cptr;
int *lenp;
{
static struct sockaddr_un sock;
(void)alarm(2);
cptr->fd = socket(AF_UNIX, SOCK_STREAM, 0);
(void)alarm(0);
if (cptr->fd == -1 && errno == EAGAIN)
{
sendto_ops(
"Unix domain connect to host %s failed: No more sockets",
get_client_name(cptr,TRUE));
return NULL;
}
if (cptr->fd == -1)
{
report_error("Unix domain connect to host %s failed: %s", cptr);
return NULL;
}
else if (cptr->fd >= MAXCLIENTS)
{
sendto_ops("No more connections allowed (%s)", cptr->name);
return NULL;
}
get_sockhost(cptr, aconf->host);
/* +2 needed for working Unix domain -- dl*/
strncpyzt(sock.sun_path, aconf->host+2, sizeof(sock.sun_path));
sock.sun_family = AF_UNIX;
*lenp = strlen(sock.sun_path) + 2;
SetUnixSock(cptr);
return (struct sockaddr *)&sock;
}
#endif
/*
* The following section of code performs summoning of users to irc.
*/
#if defined(ENABLE_SUMMON) || defined(ENABLE_USERS)
int utmp_open()
{
#ifdef O_NOCTTY
return (open(UTMP, O_RDONLY|O_NOCTTY));
#else
return (open(UTMP, O_RDONLY));
#endif
}
int utmp_read(fd, name, line, host, hlen)
int fd, hlen;
char *name, *line, *host;
{
struct utmp ut;
while (read(fd, (char *)&ut, sizeof (struct utmp))
== sizeof (struct utmp))
{
strncpyzt(name, ut.ut_name, 9);
strncpyzt(line, ut.ut_line, 10);
#ifdef USER_PROCESS
# if defined(HPUX) || defined(AIX)
strncpyzt(host,(ut.ut_host[0]) ? (ut.ut_host) : me.name, 16);
# else
strncpyzt(host, me.name, 9);
# endif
if (ut.ut_type == USER_PROCESS)
return 0;
#else
strncpyzt(host, (ut.ut_host[0]) ? (ut.ut_host) : me.name,
hlen);
if (ut.ut_name[0])
return 0;
#endif
}
return -1;
}
int utmp_close(fd)
int fd;
{
return(close(fd));
}
#ifdef ENABLE_SUMMON
void summon(who, namebuf, linebuf, chname)
aClient *who;
char *namebuf, *linebuf, *chname;
{
static char wrerr[] = "NOTICE %s :Write error. Couldn't summon.";
int fd;
char line[120];
struct tm *tp;
tp = localtime(&now);
if (strlen(linebuf) > (size_t) 9)
{
sendto_one(who,"NOTICE %s :Serious fault in SUMMON.",
who->name);
sendto_one(who,
"NOTICE %s :linebuf too long. Inform Administrator",
who->name);
return;
}
/*
* Following line added to prevent cracking to e.g. /dev/kmem if
* UTMP is for some silly reason writable to everyone...
*/
if ((linebuf[0] != 't' || linebuf[1] != 't' || linebuf[2] != 'y')
&& (linebuf[0] != 'c' || linebuf[1] != 'o' || linebuf[2] != 'n')
#ifdef HPUX
&& (linebuf[0] != 'p' || linebuf[1] != 't' || linebuf[2] != 'y' ||
linebuf[3] != '/')
#endif
)
{
sendto_one(who,
"NOTICE %s :Looks like mere mortal souls are trying to",
who->name);
sendto_one(who,"NOTICE %s :enter the twilight zone... ",
who->name);
Debug((0, "%s (%s@%s, nick %s, %s)",
"FATAL: major security hack. Notify Administrator !",
who->username, who->user->host,
who->name, who->info));
return;
}
(void)sprintf(line,"/dev/%s", linebuf);
(void)alarm(5);
#ifdef O_NOCTTY
if ((fd = open(line, O_WRONLY | O_NDELAY | O_NOCTTY)) == -1)
#else
if ((fd = open(line, O_WRONLY | O_NDELAY)) == -1)
#endif
{
(void)alarm(0);
sendto_one(who,
"NOTICE %s :%s seems to have disabled summoning...",
who->name, namebuf);
return;
}
#if !defined(O_NOCTTY) && defined(TIOCNOTTY)
(void) ioctl(fd, TIOCNOTTY, NULL);
#endif
(void)alarm(0);
(void)sprintf(line,"\n\r\007Message from IRC_Daemon@%s at %d:%02d\n\r",
me.name, tp->tm_hour, tp->tm_min);
if (write(fd, line, strlen(line)) != strlen(line))
{
(void)alarm(0);
(void)close(fd);
sendto_one(who, wrerr, who->name);
return;
}
(void)alarm(0);
(void)strcpy(line, "ircd: You are being summoned to Internet Relay \
Chat on\n\r");
(void)alarm(5);
if (write(fd, line, strlen(line)) != strlen(line))
{
(void)alarm(0);
(void)close(fd);
sendto_one(who, wrerr, who->name);
return;
}
(void)alarm(0);
(void)sprintf(line, "ircd: Channel %s, by %s@%s (%s) %s\n\r",
chname, who->user->username, who->user->host, who->name, who->info);
(void)alarm(5);
if (write(fd, line, strlen(line)) != strlen(line))
{
(void)alarm(0);
(void)close(fd);
sendto_one(who, wrerr, who->name);
return;
}
(void)alarm(0);
(void)strcpy(line,"ircd: Respond with irc\n\r");
(void)alarm(5);
if (write(fd, line, strlen(line)) != strlen(line))
{
(void)alarm(0);
(void)close(fd);
sendto_one(who, wrerr, who->name);
return;
}
(void)close(fd);
(void)alarm(0);
sendto_one(who, rpl_str(RPL_SUMMONING), me.name, who->name, namebuf);
return;
}
# endif
#endif /* ENABLE_SUMMON */
/*
** 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 get_my_name(cptr, name, len)
aClient *cptr;
char *name;
int len;
{
static char tmp[HOSTLEN+1];
struct hostent *hp;
char *cname = cptr->name;
/*
** Setup local socket structure to use for binding to.
*/
bzero((char *)&mysk, sizeof(mysk));
mysk.sin_family = AF_INET;
if (gethostname(name,len) == -1)
return;
name[len] = '\0';
/* assume that a name containing '.' is a FQDN */
if (!index(name,'.'))
add_local_domain(name, len - strlen(name));
/*
** If hostname gives another name than cname, then check if there is
** a CNAME record for cname pointing to hostname. If so accept
** cname as our name. meLazy
*/
if (BadPtr(cname))
return;
if ((hp = gethostbyname(cname)) || (hp = gethostbyname(name)))
{
const char *hname;
int i = 0;
for (hname = hp->h_name; hname; hname = hp->h_aliases[i++])
{
strncpyzt(tmp, hname, sizeof(tmp));
add_local_domain(tmp, sizeof(tmp) - strlen(tmp));
/*
** Copy the matching name over and store the
** 'primary' IP# as 'myip' which is used
** later for making the right one is used
** for connecting to other hosts.
*/
if (!strcasecmp(me.name, tmp))
break;
}
if (strcasecmp(me.name, tmp))
strncpyzt(name, hp->h_name, len);
else
strncpyzt(name, tmp, len);
bcopy(hp->h_addr, (char *)&mysk.sin_addr,
sizeof(struct in_addr));
Debug((DEBUG_DEBUG,"local name is %s",
get_client_name(&me,TRUE)));
}
return;
}
/*
** setup a UDP socket and listen for incoming packets
*/
int setup_ping()
{
struct sockaddr_in from;
int on = 1;
bzero((char *)&from, sizeof(from));
#ifdef VIRTUAL_HOST
from.sin_addr = vserv.sin_addr;
#else
from.sin_addr.s_addr = htonl(INADDR_ANY);
#endif
#ifdef TESTNET
from.sin_port = htons(atoi(UDP_PORT) + 10000);
#else
from.sin_port = htons(atoi(UDP_PORT));
#endif
from.sin_family = AF_INET;
if ((udpfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
{
Debug((DEBUG_ERROR, "socket udp : %s", strerror(errno)));
return -1;
}
if (setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR,
(OPT_TYPE *)&on, sizeof(on)) == -1)
{
#ifdef USE_SYSLOG
syslog(LOG_ERR, "setsockopt udp fd %d : %m", udpfd);
#endif
Debug((DEBUG_ERROR, "setsockopt so_reuseaddr : %s",
strerror(errno)));
(void)close(udpfd);
udpfd = -1;
return -1;
}
on = 0;
(void) setsockopt(udpfd, SOL_SOCKET, SO_BROADCAST,
(char *)&on, sizeof(on));
if (bind(udpfd, (struct sockaddr *)&from, sizeof(from))==-1)
{
#ifdef USE_SYSLOG
syslog(LOG_ERR, "bind udp.%d fd %d : %m",
from.sin_port, udpfd);
#endif
Debug((DEBUG_ERROR, "bind : %s", strerror(errno)));
(void)close(udpfd);
udpfd = -1;
return -1;
}
if (fcntl(udpfd, F_SETFL, FNDELAY)==-1)
{
Debug((DEBUG_ERROR, "fcntl fndelay : %s", strerror(errno)));
(void)close(udpfd);
udpfd = -1;
return -1;
}
return udpfd;
}
/*
* max # of pings set to 15/sec.
*/
static void polludp()
{
Reg1 char *s;
struct sockaddr_in from;
socklen_t fromlen = sizeof(from);
int n;
static time_t last = 0;
static int cnt = 0, mlen = 0;
/*
* find max length of data area of packet.
*/
if (!mlen)
{
mlen = sizeof(readbuf) - strlen(me.name) - strlen(version);
mlen -= 6;
if (mlen < 0)
mlen = 0;
}
Debug((DEBUG_DEBUG,"udp poll"));
n = recvfrom(udpfd, readbuf, mlen, 0,
(struct sockaddr *)&from, &fromlen);
if (now == last)
if (++cnt > 14)
return;
cnt = 0;
last = now;
if (n == -1)
{
if ((errno == EWOULDBLOCK) || (errno == EAGAIN))
return;
else
{
report_error("udp port recvfrom (%s): %s", &me);
return;
}
}
ircstp->is_udp++;
if (n < 19)
return;
s = readbuf + n;
/*
* attach my name and version for the reply
*/
*readbuf |= 1;
(void)strcpy(s, me.name);
s += strlen(s)+1;
(void)strcpy(s, version);
s += strlen(s);
(void)sendto(udpfd, readbuf, s-readbuf, 0,
(struct sockaddr *)&from ,sizeof(from));
return;
}
/*
* do_dns_async
*
* Called when the fd returned from init_resolver() has been selected for
* reading.
*/
static void do_dns_async()
{
static Link ln;
aClient *cptr;
aConfItem *aconf;
struct hostent *hp;
ln.flags = -1;
hp = get_res((char *)&ln);
Debug((DEBUG_DNS,"%#x = get_res(%d,%#x)",hp,ln.flags,ln.value.cptr));
switch (ln.flags)
{
case ASYNC_NONE :
/*
* no reply was processed that was outstanding or had a client
* still waiting.
*/
break;
case ASYNC_CLIENT :
if ((cptr = ln.value.cptr))
{
del_queries((char *)cptr);
ClearDNS(cptr);
if (!DoingAuth(cptr))
SetAccess(cptr);
cptr->hostp = hp;
}
break;
case ASYNC_CONNECT :
aconf = ln.value.aconf;
if (hp && aconf)
{
bcopy(hp->h_addr, (char *)&aconf->ipnum,
sizeof(struct in_addr));
(void)connect_server(aconf, NULL, hp);
}
else
sendto_ops("Connect to %s failed: host lookup",
(aconf) ? aconf->host : "unknown");
break;
case ASYNC_PING :
cptr = ln.value.cptr;
del_queries((char *)cptr);
if (hp)
{
bcopy(hp->h_addr, (char *)&cptr->ip, sizeof(struct in_addr));
if (ping_server(cptr, hp) == -1)
end_ping(cptr);
}
else
{
sendto_ops("Udp ping to %s failed: host lookup",
cptr->sockhost);
end_ping(cptr);
}
break;
case ASYNC_CONF :
aconf = ln.value.aconf;
if (hp && aconf)
bcopy(hp->h_addr, (char *)&aconf->ipnum,
sizeof(struct in_addr));
break;
default :
break;
}
}
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