mirror of
https://github.com/jrbrtsn/ban2fail
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90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
/***************************************************************************
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* Copyright (C) 2019 by John D. Robertson *
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* john@rrci.com *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#define _GNU_SOURCE
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#include <arpa/inet.h>
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#include <assert.h>
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#include <stdlib.h>
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#include "ez_libc.h"
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#include "util.h"
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const static struct addrinfo rev_hints= {
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.ai_flags = AI_NUMERICHOST, /* doing reverse lookups */
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.ai_family = AF_UNSPEC, /* Allow IPv4 or IPv6 */
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.ai_socktype= SOCK_DGRAM,
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.ai_protocol= IPPROTO_UDP
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};
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const static struct addrinfo fwd_hints= {
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.ai_family= AF_UNSPEC, /* Allow IPv4 or IPv6 */
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.ai_socktype= SOCK_DGRAM,
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.ai_protocol= IPPROTO_UDP
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};
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int
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main(int argc, char **argv)
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{
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int rtn= EXIT_FAILURE;
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const char *addr= NULL;
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static char hostBuf[PATH_MAX];
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extern char *optarg;
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extern int optind, optopt;
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for(optind= 1; optind < argc; ++optind)
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{
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addr= argv[optind];
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/*============ Reverse DNS lookup ================*/
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/* Get a populated addrinfo object */
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struct addrinfo *res= NULL;
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int rc= ez_getaddrinfo(addr, NULL, &rev_hints, &res);
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assert(0 == rc);
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assert(res && res->ai_addr && res->ai_addrlen);
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addrinfo_print(res, stdout);
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ez_fflush(stdout);
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/* Now do blocking reverse lookup */
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rc= ez_getnameinfo(res->ai_addr, res->ai_addrlen, hostBuf, sizeof(hostBuf)-1, NULL, 0, NI_NAMEREQD);
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if(rc) {
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ez_fprintf(stdout, "%s\n", gai_strerror(rc));
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continue;
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}
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ez_fprintf(stdout, "RevDNS= \"%s\"\n", hostBuf);
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ez_fflush(stdout);
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/*============ Forward DNS lookup ================*/
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rc= ez_getaddrinfo(hostBuf, NULL, &fwd_hints, &res);
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const char *msg= NULL;
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if(rc) {
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ez_fprintf(stdout, "%s\n", gai_strerror(rc));
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continue;
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}
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addrinfo_print(res, stdout);
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ez_fflush(stdout);
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}
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rtn= EXIT_SUCCESS;
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abort:
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return rtn;
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}
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