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