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/socket.h>
25 #include <arpa/inet.h>
27 #include <netinet/in.h>
31 #include "socket-util.h"
32 #include "sd-resolve.h"
33 #include "resolve-util.h"
36 static int getaddrinfo_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) {
37 const struct addrinfo *i;
42 log_error("getaddrinfo error: %s %i", gai_strerror(ret), ret);
46 for (i = ai; i; i = i->ai_next) {
47 _cleanup_free_ char *addr = NULL;
49 assert_se(sockaddr_pretty(i->ai_addr, i->ai_addrlen, false, true, &addr) == 0);
53 printf("canonical name: %s\n", strna(ai->ai_canonname));
58 static int getnameinfo_handler(sd_resolve_query *q, int ret, const char *host, const char *serv, void *userdata) {
62 log_error("getnameinfo error: %s %i", gai_strerror(ret), ret);
66 printf("Host: %s -- Serv: %s\n", strna(host), strna(serv));
70 static int res_handler(sd_resolve_query *q, int ret, unsigned char *answer, void *userdata) {
71 int qdcount, ancount, len;
72 const unsigned char *pos = answer + sizeof(HEADER);
73 unsigned char *end = answer + ret;
74 HEADER *head = (HEADER *) answer;
79 log_error("res_query() error: %s %i", strerror(errno), errno);
84 log_error("No reply for SRV lookup");
88 qdcount = ntohs(head->qdcount);
89 ancount = ntohs(head->ancount);
91 printf("%d answers for srv lookup:\n", ancount);
93 /* Ignore the questions */
94 while (qdcount-- > 0 && (len = dn_expand(answer, end, pos, name, 255)) >= 0) {
96 pos += len + QFIXEDSZ;
99 /* Parse the answers */
100 while (ancount-- > 0 && (len = dn_expand(answer, end, pos, name, 255)) >= 0) {
101 /* Ignore the initial string */
102 uint16_t pref, weight, port;
105 /* Ignore type, ttl, class and dlen */
109 GETSHORT(weight, pos);
111 len = dn_expand(answer, end, pos, name, 255);
112 printf("\tpreference: %2d weight: %2d port: %d host: %s\n",
113 pref, weight, port, name);
121 int main(int argc, char *argv[]) {
122 _cleanup_resolve_query_unref_ sd_resolve_query *q1 = NULL, *q2 = NULL, *q3 = NULL;
123 _cleanup_resolve_unref_ sd_resolve *resolve = NULL;
126 struct addrinfo hints = {
127 .ai_family = PF_UNSPEC,
128 .ai_socktype = SOCK_STREAM,
129 .ai_flags = AI_CANONNAME
132 struct sockaddr_in sa = {
133 .sin_family = AF_INET,
134 .sin_port = htons(80)
137 assert_se(sd_resolve_default(&resolve) >= 0);
139 /* Test a floating resolver query */
140 sd_resolve_getaddrinfo(resolve, NULL, "redhat.com", "http", NULL, getaddrinfo_handler, NULL);
142 /* Make a name -> address query */
143 r = sd_resolve_getaddrinfo(resolve, &q1, argc >= 2 ? argv[1] : "www.heise.de", NULL, &hints, getaddrinfo_handler, NULL);
145 log_error_errno(r, "sd_resolve_getaddrinfo(): %m");
147 /* Make an address -> name query */
148 sa.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71");
149 r = sd_resolve_getnameinfo(resolve, &q2, (struct sockaddr*) &sa, sizeof(sa), 0, SD_RESOLVE_GET_BOTH, getnameinfo_handler, NULL);
151 log_error_errno(r, "sd_resolve_getnameinfo(): %m");
153 /* Make a res_query() call */
154 r = sd_resolve_res_query(resolve, &q3, "_xmpp-client._tcp.gmail.com", C_IN, T_SRV, res_handler, NULL);
156 log_error_errno(r, "sd_resolve_res_query(): %m");
158 /* Wait until the three queries are completed */
159 while (sd_resolve_query_is_done(q1) == 0 ||
160 sd_resolve_query_is_done(q2) == 0 ||
161 sd_resolve_query_is_done(q3) == 0) {
163 r = sd_resolve_wait(resolve, (uint64_t) -1);
165 log_error_errno(r, "sd_resolve_wait(): %m");
166 assert_not_reached("sd_resolve_wait() failed");