/*- * 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. * * $Id: resolver.c,v 1.11 1999/02/23 22:06:49 fjoe Exp $ */ #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 <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