mirror of https://github.com/jrbrtsn/ban2fail
90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
/***************************************************************************
|
|
* Copyright (C) 2019 by John D. Robertson *
|
|
* john@rrci.com *
|
|
* *
|
|
* 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 3 of the License, 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 *
|
|
* *
|
|
* 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., *
|
|
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
|
|
***************************************************************************/
|
|
#define _GNU_SOURCE
|
|
#include <arpa/inet.h>
|
|
#include <assert.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "ez_libc.h"
|
|
#include "util.h"
|
|
const static struct addrinfo rev_hints= {
|
|
.ai_flags = AI_NUMERICHOST, /* doing reverse lookups */
|
|
.ai_family = AF_UNSPEC, /* Allow IPv4 or IPv6 */
|
|
.ai_socktype= SOCK_DGRAM,
|
|
.ai_protocol= IPPROTO_UDP
|
|
};
|
|
|
|
const static struct addrinfo fwd_hints= {
|
|
.ai_family= AF_UNSPEC, /* Allow IPv4 or IPv6 */
|
|
.ai_socktype= SOCK_DGRAM,
|
|
.ai_protocol= IPPROTO_UDP
|
|
};
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
int rtn= EXIT_FAILURE;
|
|
const char *addr= NULL;
|
|
static char hostBuf[PATH_MAX];
|
|
|
|
extern char *optarg;
|
|
extern int optind, optopt;
|
|
|
|
for(optind= 1; optind < argc; ++optind)
|
|
{
|
|
addr= argv[optind];
|
|
|
|
/*============ Reverse DNS lookup ================*/
|
|
/* Get a populated addrinfo object */
|
|
struct addrinfo *res= NULL;
|
|
int rc= ez_getaddrinfo(addr, NULL, &rev_hints, &res);
|
|
assert(0 == rc);
|
|
assert(res && res->ai_addr && res->ai_addrlen);
|
|
addrinfo_print(res, stdout);
|
|
ez_fflush(stdout);
|
|
|
|
/* Now do blocking reverse lookup */
|
|
rc= ez_getnameinfo(res->ai_addr, res->ai_addrlen, hostBuf, sizeof(hostBuf)-1, NULL, 0, NI_NAMEREQD);
|
|
if(rc) {
|
|
ez_fprintf(stdout, "%s\n", gai_strerror(rc));
|
|
continue;
|
|
}
|
|
|
|
ez_fprintf(stdout, "RevDNS= \"%s\"\n", hostBuf);
|
|
ez_fflush(stdout);
|
|
|
|
/*============ Forward DNS lookup ================*/
|
|
rc= ez_getaddrinfo(hostBuf, NULL, &fwd_hints, &res);
|
|
const char *msg= NULL;
|
|
|
|
if(rc) {
|
|
ez_fprintf(stdout, "%s\n", gai_strerror(rc));
|
|
continue;
|
|
}
|
|
|
|
addrinfo_print(res, stdout);
|
|
ez_fflush(stdout);
|
|
|
|
}
|
|
|
|
rtn= EXIT_SUCCESS;
|
|
abort:
|
|
return rtn;
|
|
}
|