summaryrefslogtreecommitdiff
path: root/src/libsystemd/sd-resolve/test-resolve.c
blob: 354a4071b7efe4fa3fe1e9a3431ef026daae0354 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2005-2008 Lennart Poettering
  Copyright 2014 Daniel Buch

  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/socket.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <netinet/in.h>
#include <resolv.h>
#include <errno.h>

#include "socket-util.h"
#include "sd-resolve.h"
#include "resolve-util.h"
#include "macro.h"

static int getaddrinfo_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) {
        const struct addrinfo *i;

        assert_se(q);

        if (ret != 0) {
                log_error("getaddrinfo error: %s %i", gai_strerror(ret), ret);
                return 0;
        }

        for (i = ai; i; i = i->ai_next) {
                _cleanup_free_ char *addr = NULL;

                assert_se(sockaddr_pretty(i->ai_addr, i->ai_addrlen, false, true, &addr) == 0);
                puts(addr);
        }

        printf("canonical name: %s\n", strna(ai->ai_canonname));

        return 0;
}

static int getnameinfo_handler(sd_resolve_query *q, int ret, const char *host, const char *serv, void *userdata) {
        assert_se(q);

        if (ret != 0) {
                log_error("getnameinfo error: %s %i", gai_strerror(ret), ret);
                return 0;
        }

        printf("Host: %s -- Serv: %s\n", strna(host), strna(serv));
        return 0;
}

static int res_handler(sd_resolve_query *q, int ret, unsigned char *answer, void *userdata) {
        int qdcount, ancount, len;
        const unsigned char *pos = answer + sizeof(HEADER);
        unsigned char *end = answer + ret;
        HEADER *head = (HEADER *) answer;
        char name[256];
        assert_se(q);

        if (ret < 0) {
                log_error("res_query() error: %s %i", strerror(errno), errno);
                return 0;
        }

        if (ret == 0) {
                log_error("No reply for SRV lookup");
                return 0;
        }

        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(answer, end, pos, name, 255)) >= 0) {
                assert_se(len >= 0);
                pos += len + QFIXEDSZ;
        }

        /* Parse the answers */
        while (ancount-- > 0 && (len = dn_expand(answer, end, pos, name, 255)) >= 0) {
                /* Ignore the initial string */
                uint16_t pref, weight, port;
                assert_se(len >= 0);
                pos += len;
                /* Ignore type, ttl, class and dlen */
                pos += 10;

                GETSHORT(pref, pos);
                GETSHORT(weight, pos);
                GETSHORT(port, pos);
                len = dn_expand(answer, end, pos, name, 255);
                printf("\tpreference: %2d weight: %2d port: %d host: %s\n",
                       pref, weight, port, name);

                pos += len;
        }

        return 0;
}

int main(int argc, char *argv[]) {
        _cleanup_resolve_query_unref_ sd_resolve_query *q1 = NULL, *q2 = NULL, *q3 = NULL;
        _cleanup_resolve_unref_ sd_resolve *resolve = NULL;
        int r = 0;

        struct addrinfo hints = {
                .ai_family = PF_UNSPEC,
                .ai_socktype = SOCK_STREAM,
                .ai_flags = AI_CANONNAME
        };

        struct sockaddr_in sa = {
                .sin_family = AF_INET,
                .sin_port = htons(80)
        };

        assert_se(sd_resolve_default(&resolve) >= 0);

        /* Test a floating resolver query */
        sd_resolve_getaddrinfo(resolve, NULL, "redhat.com", "http", NULL, getaddrinfo_handler, NULL);

        /* Make a name -> address query */
        r = sd_resolve_getaddrinfo(resolve, &q1, argc >= 2 ? argv[1] : "www.heise.de", NULL, &hints, getaddrinfo_handler, NULL);
        if (r < 0)
                log_error_errno(r, "sd_resolve_getaddrinfo(): %m");

        /* Make an address -> name query */
        sa.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71");
        r = sd_resolve_getnameinfo(resolve, &q2, (struct sockaddr*) &sa, sizeof(sa), 0, SD_RESOLVE_GET_BOTH, getnameinfo_handler, NULL);
        if (r < 0)
                log_error_errno(r, "sd_resolve_getnameinfo(): %m");

        /* Make a res_query() call */
        r = sd_resolve_res_query(resolve, &q3, "_xmpp-client._tcp.gmail.com", C_IN, T_SRV, res_handler, NULL);
        if (r < 0)
                log_error_errno(r, "sd_resolve_res_query(): %m");

        /* Wait until the three queries are completed */
        while (sd_resolve_query_is_done(q1) == 0 ||
               sd_resolve_query_is_done(q2) == 0 ||
               sd_resolve_query_is_done(q3) == 0) {

                r = sd_resolve_wait(resolve, (uint64_t) -1);
                if (r < 0) {
                        log_error_errno(r, "sd_resolve_wait(): %m");
                        assert_not_reached("sd_resolve_wait() failed");
                }
        }

        return 0;
}