/* $Id: resolver.c,v 1.666 2004/09/20 10:50:15 shrike Exp $ */
/************************************************************************************
* Copyright 2004 Astrum Metaphora consortium *
* *
* Licensed under the Apache License, Version 2.0 (the "License"); *
* you may not use this file except in compliance with the License. *
* You may obtain a copy of the License at *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, software *
* distributed under the License is distributed on an "AS IS" BASIS, *
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
* See the License for the specific language governing permissions and *
* limitations under the License. *
* *
************************************************************************************/
/************************************************************************************
* ANATOLIA 2.1 is copyright 1996-1997 Serdar BULUT, Ibrahim CANPUNAR *
* ANATOLIA has been brought to you by ANATOLIA consortium *
* Serdar BULUT {Chronos} bulut@rorqual.cc.metu.edu.tr *
* Ibrahim Canpunar {Asena} canpunar@rorqual.cc.metu.edu.tr *
* Murat BICER {KIO} mbicer@rorqual.cc.metu.edu.tr *
* D.Baris ACAR {Powerman} dbacar@rorqual.cc.metu.edu.tr *
* By using this code, you have agreed to follow the terms of the *
* ANATOLIA license, in the file Anatolia/anatolia.licence *
***********************************************************************************/
/************************************************************************************
* Original Diku Mud copyright (C) 1990, 1991 by Sebastian Hammer, *
* Michael Seifert, Hans Henrik St{rfeldt, Tom Madsen, and Katja Nyboe. *
* *
* Merc Diku Mud improvments copyright (C) 1992, 1993 by Michael *
* Chastain, Michael Quan, and Mitchell Tse. *
* *
* In order to use any part of this Merc Diku Mud, you must comply with *
* both the original Diku license in 'license.doc' as well the Merc *
* license in 'license.txt'. In particular, you may not remove either of *
* these copyright notices. *
* *
* Much time and thought has gone into this software and you are *
* benefitting. We hope that you share your changes too. What goes *
* around, comes around. *
************************************************************************************/
/************************************************************************************
* ROM 2.4 is copyright 1993-1995 Russ Taylor *
* ROM has been brought to you by the ROM consortium *
* Russ Taylor (rtaylor@pacinfo.com) *
* Gabrielle Taylor (gtaylor@pacinfo.com) *
* Brian Moore (rom@rom.efn.org) *
* By using this code, you have agreed to follow the terms of the *
* ROM license, in the file Rom24/doc/rom.license *
*************************************************************************************/
/************************************************************************************
* Copyright (c) 1998 fjoe <fjoe@iclub.nsu.ru> *
* All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* 1. Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* 2. Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* *
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND *
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE *
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE *
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE *
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL *
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS *
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) *
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT *
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY *
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF *
* SUCH DAMAGE. *
************************************************************************************/
#if !defined (WIN32)
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include "typedef.h"
#include "log.h"
#include "resolver.h"
FILE * rfin;
FILE * rfout;
static void cleanup(int);
static void resolver_loop(void);
int rpid;
int fildes[4];
void resolver_init(void)
{
if (pipe(fildes) < 0 || pipe(fildes+2) < 0) {
log_printf("resolver_init: pipe: %s", strerror(errno));
exit(1);
}
signal(SIGPIPE, SIG_IGN);
rpid = fork();
if (rpid < 0) {
log_printf("resolver_init: fork: %s", strerror(errno));
exit(1);
}
if (rpid == 0)
resolver_loop();
signal(SIGHUP, cleanup);
signal(SIGQUIT, cleanup);
signal(SIGILL, cleanup);
signal(SIGABRT, cleanup);
signal(SIGFPE, cleanup);
signal(SIGBUS, cleanup);
signal(SIGSEGV, cleanup);
signal(SIGALRM, cleanup);
signal(SIGTERM, cleanup);
/*
#if !defined (LINUX)
signal(SIGEMT, cleanup);
signal(SIGSYS, cleanup);
#endif
*/
close(fildes[1]);
close(fildes[2]);
rfin = fdopen(fildes[0], "r");
rfout = fdopen(fildes[3], "w");
if (rfin == NULL || rfout == NULL) {
log_printf("resolver_init: fdopen: %s", strerror(errno));
exit(1);
}
setvbuf(rfin, NULL, _IOLBF, 0);
setvbuf(rfout, NULL, _IOLBF, 0);
fcntl(fileno(rfin), F_SETFL, O_NONBLOCK);
}
void resolver_done(void)
{
fclose(rfin);
fclose(rfout);
kill(rpid, SIGTERM);
wait(NULL);
}
/* local functions */
static void cleanup(int s)
{
resolver_done();
signal(s, SIG_DFL);
raise(s);
}
static void resolver_loop(void)
{
FILE *fin;
FILE *fout;
char buf[128];
signal(SIGINT, SIG_IGN);
signal(SIGTRAP, SIG_IGN);
close(fildes[0]);
close(fildes[3]);
fin = fdopen(fildes[2], "r");
fout = fdopen(fildes[1], "w");
if (fin == NULL || fout == NULL) {
log_printf("resolver_loop: fdopen: %s", strerror(errno));
exit(1);
}
setvbuf(fin, NULL, _IOLBF, 0);
setvbuf(fout, NULL, _IOLBF, 0);
while(fgets(buf, sizeof(buf), fin)) {
struct in_addr addr;
struct hostent *hostent;
char *p;
if ((p = strchr(buf, '\n')) == NULL) {
while(fgetc(fin) != '\n')
;
continue;
}
*p = '\0';
if ((p = strchr(buf, '@')) == NULL)
return;
*p++ = '\0';
log_printf("resolver_loop: %s@%s", buf, p);
inet_aton(p, &addr);
hostent = gethostbyaddr((char*) &addr, sizeof(addr), AF_INET);
fprintf(fout, "%s@%s\n",
buf, hostent ? hostent->h_name : p);
}
if (errno)
log_printf("resolver_loop: %s", strerror(errno));
fclose(fin);
fclose(fout);
exit(0);
}
#endif