161 lines
5.8 KiB
C
161 lines
5.8 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2005-2008 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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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 License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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#include <assert.h>
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#include <signal.h>
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#include <errno.h>
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#include "sd-resolve.h"
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#include "resolve-util.h"
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#include "macro.h"
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int main(int argc, char *argv[]) {
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int r = 1, ret;
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_cleanup_resolve_free_ sd_resolve *resolve = NULL;
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_cleanup_resolve_addrinfo_free_ struct addrinfo *ai = NULL;
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_cleanup_free_ unsigned char *srv = NULL;
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sd_resolve_query *q1, *q2, *q3;
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struct addrinfo hints = {};
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struct sockaddr_in sa = {};
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char host[NI_MAXHOST] = "", serv[NI_MAXSERV] = "";
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signal(SIGCHLD, SIG_IGN);
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resolve = sd_resolve_new(2);
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if (!resolve)
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log_oom();
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/* Make a name -> address query */
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hints.ai_family = PF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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q1 = sd_resolve_getaddrinfo(resolve, argc >= 2 ? argv[1] : "www.heise.de", NULL, &hints);
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if (!q1)
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fprintf(stderr, "sd_resolve_getaddrinfo(): %s\n", strerror(errno));
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/* Make an address -> name query */
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sa.sin_family = AF_INET;
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sa.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71");
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sa.sin_port = htons(80);
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q2 = sd_resolve_getnameinfo(resolve, (struct sockaddr*) &sa, sizeof(sa), 0, 1, 1);
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if (!q2)
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fprintf(stderr, "sd_resolve_getnameinfo(): %s\n", strerror(errno));
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/* Make a res_query() call */
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q3 = sd_resolve_res_query(resolve, "_xmpp-client._tcp.gmail.com", C_IN, T_SRV);
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if (!q3)
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fprintf(stderr, "sd_resolve_res_query(): %s\n", strerror(errno));
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/* Wait until the three queries are completed */
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while (!sd_resolve_isdone(resolve, q1) ||
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!sd_resolve_isdone(resolve, q2) ||
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!sd_resolve_isdone(resolve, q3)) {
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if (sd_resolve_wait(resolve, 1) < 0)
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fprintf(stderr, "sd_resolve_wait(): %s\n", strerror(errno));
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}
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/* Interpret the result of the name -> addr query */
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ret = sd_resolve_getaddrinfo_done(resolve, q1, &ai);
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if (ret)
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fprintf(stderr, "error: %s %i\n", gai_strerror(ret), ret);
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else {
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struct addrinfo *i;
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for (i = ai; i; i = i->ai_next) {
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char t[256];
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const char *p = NULL;
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if (i->ai_family == PF_INET)
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p = inet_ntop(AF_INET, &((struct sockaddr_in*) i->ai_addr)->sin_addr, t, sizeof(t));
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else if (i->ai_family == PF_INET6)
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p = inet_ntop(AF_INET6, &((struct sockaddr_in6*) i->ai_addr)->sin6_addr, t, sizeof(t));
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printf("%s\n", p);
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}
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}
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/* Interpret the result of the addr -> name query */
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ret = sd_resolve_getnameinfo_done(resolve, q2, host, sizeof(host), serv, sizeof(serv));
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if (ret)
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fprintf(stderr, "error: %s %i\n", gai_strerror(ret), ret);
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else
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printf("%s -- %s\n", host, serv);
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/* Interpret the result of the SRV lookup */
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ret = sd_resolve_res_done(resolve, q3, &srv);
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if (ret < 0) {
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fprintf(stderr, "error: %s %i\n", strerror(errno), ret);
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} else if (ret == 0) {
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fprintf(stderr, "No reply for SRV lookup\n");
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} else {
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int qdcount;
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int ancount;
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int len;
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const unsigned char *pos = srv + sizeof(HEADER);
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unsigned char *end = srv + ret;
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HEADER *head = (HEADER *)srv;
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char name[256];
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qdcount = ntohs(head->qdcount);
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ancount = ntohs(head->ancount);
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printf("%d answers for srv lookup:\n", ancount);
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/* Ignore the questions */
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while (qdcount-- > 0 && (len = dn_expand(srv, end, pos, name, 255)) >= 0) {
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assert(len >= 0);
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pos += len + QFIXEDSZ;
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}
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/* Parse the answers */
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while (ancount-- > 0 && (len = dn_expand(srv, end, pos, name, 255)) >= 0) {
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/* Ignore the initial string */
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uint16_t pref, weight, port;
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assert(len >= 0);
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pos += len;
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/* Ignore type, ttl, class and dlen */
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pos += 10;
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GETSHORT(pref, pos);
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GETSHORT(weight, pos);
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GETSHORT(port, pos);
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len = dn_expand(srv, end, pos, name, 255);
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printf("\tpreference: %2d weight: %2d port: %d host: %s\n",
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pref, weight, port, name);
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pos += len;
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}
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}
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r = 0;
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return r;
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}
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