1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2005-2008 Lennart Poettering
7 Copyright 2014 Daniel Buch
9 systemd is free software; you can redistribute it and/or modify it
10 under the terms of the GNU Lesser General Public License as published by
11 the Free Software Foundation; either version 2.1 of the License, or
12 (at your option) any later version.
14 systemd is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
19 You should have received a copy of the GNU Lesser General Public License
20 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include <sys/types.h>
25 #include <sys/socket.h>
26 #include <arpa/inet.h>
28 #include <netinet/in.h>
29 #include <arpa/nameser.h>
34 #include "socket-util.h"
35 #include "sd-resolve.h"
36 #include "resolve-util.h"
39 static int getaddrinfo_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) {
40 const struct addrinfo *i;
45 log_error("getaddrinfo error: %s %i", gai_strerror(ret), ret);
49 for (i = ai; i; i = i->ai_next) {
50 _cleanup_free_ char *addr = NULL;
52 assert_se(sockaddr_pretty(i->ai_addr, i->ai_addrlen, false, &addr) == 0);
56 printf("canonical name: %s\n", strna(ai->ai_canonname));
61 static int getnameinfo_handler(sd_resolve_query *q, int ret, const char *host, const char *serv, void *userdata) {
65 log_error("getnameinfo error: %s %i", gai_strerror(ret), ret);
69 printf("Host: %s -- Serv: %s\n", strna(host), strna(serv));
73 static int res_handler(sd_resolve_query *q, int ret, unsigned char *answer, void *userdata) {
74 int qdcount, ancount, len;
75 const unsigned char *pos = answer + sizeof(HEADER);
76 unsigned char *end = answer + ret;
77 HEADER *head = (HEADER *) answer;
82 log_error("res_query() error: %s %i", strerror(errno), errno);
87 log_error("No reply for SRV lookup");
91 qdcount = ntohs(head->qdcount);
92 ancount = ntohs(head->ancount);
94 printf("%d answers for srv lookup:\n", ancount);
96 /* Ignore the questions */
97 while (qdcount-- > 0 && (len = dn_expand(answer, end, pos, name, 255)) >= 0) {
99 pos += len + QFIXEDSZ;
102 /* Parse the answers */
103 while (ancount-- > 0 && (len = dn_expand(answer, end, pos, name, 255)) >= 0) {
104 /* Ignore the initial string */
105 uint16_t pref, weight, port;
108 /* Ignore type, ttl, class and dlen */
112 GETSHORT(weight, pos);
114 len = dn_expand(answer, end, pos, name, 255);
115 printf("\tpreference: %2d weight: %2d port: %d host: %s\n",
116 pref, weight, port, name);
124 int main(int argc, char *argv[]) {
125 _cleanup_resolve_query_unref_ sd_resolve_query *q1 = NULL, *q2 = NULL, *q3 = NULL;
126 _cleanup_resolve_unref_ sd_resolve *resolve = NULL;
129 struct addrinfo hints = {
130 .ai_family = PF_UNSPEC,
131 .ai_socktype = SOCK_STREAM,
132 .ai_flags = AI_CANONNAME
135 struct sockaddr_in sa = {
136 .sin_family = AF_INET,
137 .sin_port = htons(80)
140 assert_se(sd_resolve_default(&resolve) >= 0);
142 /* Test a floating resolver query */
143 sd_resolve_getaddrinfo(resolve, NULL, "redhat.com", "http", NULL, getaddrinfo_handler, NULL);
145 /* Make a name -> address query */
146 r = sd_resolve_getaddrinfo(resolve, &q1, argc >= 2 ? argv[1] : "www.heise.de", NULL, &hints, getaddrinfo_handler, NULL);
148 log_error_errno(r, "sd_resolve_getaddrinfo(): %m");
150 /* Make an address -> name query */
151 sa.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71");
152 r = sd_resolve_getnameinfo(resolve, &q2, (struct sockaddr*) &sa, sizeof(sa), 0, SD_RESOLVE_GET_BOTH, getnameinfo_handler, NULL);
154 log_error_errno(r, "sd_resolve_getnameinfo(): %m");
156 /* Make a res_query() call */
157 r = sd_resolve_res_query(resolve, &q3, "_xmpp-client._tcp.gmail.com", C_IN, T_SRV, res_handler, NULL);
159 log_error_errno(r, "sd_resolve_res_query(): %m");
161 /* Wait until the three queries are completed */
162 while (sd_resolve_query_is_done(q1) == 0 ||
163 sd_resolve_query_is_done(q2) == 0 ||
164 sd_resolve_query_is_done(q3) == 0) {
166 r = sd_resolve_wait(resolve, (uint64_t) -1);
168 log_error_errno(r, "sd_resolve_wait(): %m");
169 assert_not_reached("sd_resolve_wait() failed");