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>
35 #include "socket-util.h"
36 #include "sd-resolve.h"
37 #include "resolve-util.h"
40 static int getaddrinfo_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) {
41 const struct addrinfo *i;
46 log_error("getaddrinfo error: %s %i\n", gai_strerror(ret), ret);
50 for (i = ai; i; i = i->ai_next) {
51 _cleanup_free_ char *addr = NULL;
53 assert_se(sockaddr_pretty(i->ai_addr, i->ai_addrlen, false, &addr) == 0);
57 printf("canonical name: %s\n", strna(ai->ai_canonname));
62 static int getnameinfo_handler(sd_resolve_query *q, int ret, const char *host, const char *serv, void *userdata) {
66 log_error("getnameinfo error: %s %i\n", gai_strerror(ret), ret);
70 printf("Host: %s -- Serv: %s\n", strna(host), strna(serv));
74 static int res_handler(sd_resolve_query *q, int ret, unsigned char *answer, void *userdata) {
75 int qdcount, ancount, len;
76 const unsigned char *pos = answer + sizeof(HEADER);
77 unsigned char *end = answer + ret;
78 HEADER *head = (HEADER *) answer;
83 log_error("res_query() error: %s %i\n", strerror(errno), errno);
88 log_error("No reply for SRV lookup\n");
92 qdcount = ntohs(head->qdcount);
93 ancount = ntohs(head->ancount);
95 printf("%d answers for srv lookup:\n", ancount);
97 /* Ignore the questions */
98 while (qdcount-- > 0 && (len = dn_expand(answer, end, pos, name, 255)) >= 0) {
100 pos += len + QFIXEDSZ;
103 /* Parse the answers */
104 while (ancount-- > 0 && (len = dn_expand(answer, end, pos, name, 255)) >= 0) {
105 /* Ignore the initial string */
106 uint16_t pref, weight, port;
109 /* Ignore type, ttl, class and dlen */
113 GETSHORT(weight, pos);
115 len = dn_expand(answer, end, pos, name, 255);
116 printf("\tpreference: %2d weight: %2d port: %d host: %s\n",
117 pref, weight, port, name);
125 int main(int argc, char *argv[]) {
126 _cleanup_resolve_query_unref_ sd_resolve_query *q1 = NULL, *q2 = NULL, *q3 = NULL;
127 _cleanup_resolve_unref_ sd_resolve *resolve = NULL;
130 struct addrinfo hints = {
131 .ai_family = PF_UNSPEC,
132 .ai_socktype = SOCK_STREAM,
133 .ai_flags = AI_CANONNAME
136 struct sockaddr_in sa = {
137 .sin_family = AF_INET,
138 .sin_port = htons(80)
141 assert_se(sd_resolve_default(&resolve) >= 0);
143 /* Test a floating resolver query */
144 sd_resolve_getaddrinfo(resolve, NULL, "redhat.com", "http", NULL, getaddrinfo_handler, NULL);
146 /* Make a name -> address query */
147 r = sd_resolve_getaddrinfo(resolve, &q1, argc >= 2 ? argv[1] : "www.heise.de", NULL, &hints, getaddrinfo_handler, NULL);
149 log_error("sd_resolve_getaddrinfo(): %s\n", strerror(-r));
151 /* Make an address -> name query */
152 sa.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71");
153 r = sd_resolve_getnameinfo(resolve, &q2, (struct sockaddr*) &sa, sizeof(sa), 0, SD_RESOLVE_GET_BOTH, getnameinfo_handler, NULL);
155 log_error("sd_resolve_getnameinfo(): %s\n", strerror(-r));
157 /* Make a res_query() call */
158 r = sd_resolve_res_query(resolve, &q3, "_xmpp-client._tcp.gmail.com", C_IN, T_SRV, res_handler, NULL);
160 log_error("sd_resolve_res_query(): %s\n", strerror(-r));
162 /* Wait until the three queries are completed */
163 while (sd_resolve_query_is_done(q1) == 0 ||
164 sd_resolve_query_is_done(q2) == 0 ||
165 sd_resolve_query_is_done(q3) == 0) {
167 r = sd_resolve_wait(resolve, (uint64_t) -1);
169 log_error("sd_resolve_wait(): %s\n", strerror(-r));
170 assert_not_reached("sd_resolve_wait() failed");