src/libsystemd/sd-resolve/test-resolve.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2005-2008 Lennart Poettering
   6   Copyright 2014 Daniel Buch
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <arpa/inet.h>
  23 #include <errno.h>
  24 #include <netinet/in.h>
  25 #include <resolv.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <sys/socket.h>
  29
  30 #include "sd-resolve.h"
  31
  32 #include "alloc-util.h"
  33 #include "macro.h"
  34 #include "socket-util.h"
  35 #include "string-util.h"
  36
  37 #define TEST_TIMEOUT_USEC (20*USEC_PER_SEC)
  38
  39 static int getaddrinfo_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) {
  40         const struct addrinfo *i;
  41
  42         assert_se(q);
  43
  44         if (ret != 0) {
  45                 log_error("getaddrinfo error: %s %i", gai_strerror(ret), ret);
  46                 return 0;
  47         }
  48
  49         for (i = ai; i; i = i->ai_next) {
  50                 _cleanup_free_ char *addr = NULL;
  51
  52                 assert_se(sockaddr_pretty(i->ai_addr, i->ai_addrlen, false, true, &addr) == 0);
  53                 puts(addr);
  54         }
  55
  56         printf("canonical name: %s\n", strna(ai->ai_canonname));
  57
  58         return 0;
  59 }
  60
  61 static int getnameinfo_handler(sd_resolve_query *q, int ret, const char *host, const char *serv, void *userdata) {
  62         assert_se(q);
  63
  64         if (ret != 0) {
  65                 log_error("getnameinfo error: %s %i", gai_strerror(ret), ret);
  66                 return 0;
  67         }
  68
  69         printf("Host: %s — Serv: %s\n", strna(host), strna(serv));
  70         return 0;
  71 }
  72
  73 int main(int argc, char *argv[]) {
  74         _cleanup_(sd_resolve_query_unrefp) sd_resolve_query *q1 = NULL, *q2 = NULL;
  75         _cleanup_(sd_resolve_unrefp) sd_resolve *resolve = NULL;
  76         int r = 0;
  77
  78         struct addrinfo hints = {
  79                 .ai_family = PF_UNSPEC,
  80                 .ai_socktype = SOCK_STREAM,
  81                 .ai_flags = AI_CANONNAME
  82         };
  83
  84         struct sockaddr_in sa = {
  85                 .sin_family = AF_INET,
  86                 .sin_port = htons(80)
  87         };
  88
  89         assert_se(sd_resolve_default(&resolve) >= 0);
  90
  91         /* Test a floating resolver query */
  92         sd_resolve_getaddrinfo(resolve, NULL, "redhat.com", "http", NULL, getaddrinfo_handler, NULL);
  93
  94         /* Make a name -> address query */
  95         r = sd_resolve_getaddrinfo(resolve, &q1, argc >= 2 ? argv[1] : "www.heise.de", NULL, &hints, getaddrinfo_handler, NULL);
  96         if (r < 0)
  97                 log_error_errno(r, "sd_resolve_getaddrinfo(): %m");
  98
  99         /* Make an address -> name query */
 100         sa.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71");
 101         r = sd_resolve_getnameinfo(resolve, &q2, (struct sockaddr*) &sa, sizeof(sa), 0, SD_RESOLVE_GET_BOTH, getnameinfo_handler, NULL);
 102         if (r < 0)
 103                 log_error_errno(r, "sd_resolve_getnameinfo(): %m");
 104
 105         /* Wait until all queries are completed */
 106         for (;;) {
 107                 r = sd_resolve_wait(resolve, TEST_TIMEOUT_USEC);
 108                 if (r == 0)
 109                         break;
 110                 if (r == -ETIMEDOUT) {
 111                         /* Let's catch time-outs here, so that we can run safely in a CI that has no reliable DNS. Note
 112                          * that we invoke exit() directly here, as the stuck NSS call will not allow us to exit
 113                          * cleanly. */
 114
 115                         log_notice_errno(r, "sd_resolve_wait() timed out, but that's OK");
 116                         exit(EXIT_SUCCESS);
 117                         break;
 118                 }
 119                 if (r < 0) {
 120                         log_error_errno(r, "sd_resolve_wait(): %m");
 121                         assert_not_reached("sd_resolve_wait() failed");
 122                 }
 123         }
 124
 125         return 0;
 126 }