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114 lines
3.1 KiB
114 lines
3.1 KiB
/* ex-rdns.c
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parallel rDNS resolver example - read IP addresses from stdin,
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write domain names to stdout
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Copyright (C) 2005 Michael Tokarev <mjt@corpit.ru>
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This file is part of UDNS library, an async DNS stub resolver.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library, in file named COPYING.LGPL; if not,
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write to the Free Software Foundation, Inc., 59 Temple Place,
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Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <sys/poll.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <time.h>
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#include <stdlib.h>
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#include <string.h>
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#include "udns.h"
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static int curq;
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static const char *n2ip(const unsigned char *c) {
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static char b[sizeof("255.255.255.255")];
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sprintf(b, "%u.%u.%u.%u", c[0], c[1], c[2], c[3]);
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return b;
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}
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static void dnscb(struct dns_ctx *ctx, struct dns_rr_ptr *rr, void *data) {
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const char *ip = n2ip((unsigned char *)&data);
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int i;
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--curq;
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if (rr) {
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printf("%s", ip);
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for(i = 0; i < rr->dnsptr_nrr; ++i)
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printf(" %s", rr->dnsptr_ptr[i]);
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putchar('\n');
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free(rr);
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}
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else
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fprintf(stderr, "%s: %s\n", ip, dns_strerror(dns_status(ctx)));
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}
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int main(int argc, char **argv) {
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int c;
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time_t now;
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int maxq = 10;
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struct pollfd pfd;
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char linebuf[1024];
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char *eol;
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int eof;
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if (dns_init(NULL, 1) < 0) {
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fprintf(stderr, "unable to initialize dns library\n");
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return 1;
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}
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while((c = getopt(argc, argv, "m:r")) != EOF) switch(c) {
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case 'm': maxq = atoi(optarg); break;
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case 'r':
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dns_set_opt(0, DNS_OPT_FLAGS,
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dns_set_opt(0, DNS_OPT_FLAGS, -1) | DNS_NORD);
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break;
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default: return 1;
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}
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if (argc != optind) return 1;
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pfd.fd = dns_sock(0);
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pfd.events = POLLIN;
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now = time(NULL);
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c = optind;
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eof = 0;
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while(curq || !eof) {
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if (!eof && curq < maxq) {
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union { struct in_addr a; void *p; } pa;
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if (!fgets(linebuf, sizeof(linebuf), stdin)) {
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eof = 1;
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continue;
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}
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eol = strchr(linebuf, '\n');
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if (eol) *eol = '\0';
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if (!linebuf[0]) continue;
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if (dns_pton(AF_INET, linebuf, &pa.a) <= 0)
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fprintf(stderr, "%s: invalid address\n", linebuf);
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else if (dns_submit_a4ptr(0, &pa.a, dnscb, pa.p) == 0)
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fprintf(stderr, "%s: unable to submit query: %s\n",
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linebuf, dns_strerror(dns_status(0)));
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else
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++curq;
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continue;
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}
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if (curq) {
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c = dns_timeouts(0, -1, now);
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c = poll(&pfd, 1, c < 0 ? -1 : c * 1000);
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now = time(NULL);
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if (c)
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dns_ioevent(0, now);
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}
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}
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return 0;
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}
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