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

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <arpa/inet.h>
   4 #include <errno.h>
   5 #include <netinet/in.h>
   6 #include <resolv.h>
   7 #include <stdio.h>
   8
   9 #include "sd-resolve.h"
  10
  11 #include "alloc-util.h"
  12 #include "macro.h"
  13 #include "socket-util.h"
  14 #include "string-util.h"
  15 #include "time-util.h"
  16
  17 #define TEST_TIMEOUT_USEC (20*USEC_PER_SEC)
  18
  19 static int getaddrinfo_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) {
  20         const struct addrinfo *i;
  21
  22         assert_se(q);
  23
  24         if (ret != 0) {
  25                 log_error("getaddrinfo error: %s %i", gai_strerror(ret), ret);
  26                 return 0;
  27         }
  28
  29         for (i = ai; i; i = i->ai_next) {
  30                 _cleanup_free_ char *addr = NULL;
  31
  32                 assert_se(sockaddr_pretty(i->ai_addr, i->ai_addrlen, false, true, &addr) == 0);
  33                 puts(addr);
  34         }
  35
  36         printf("canonical name: %s\n", strna(ai->ai_canonname));
  37
  38         return 0;
  39 }
  40
  41 static int getnameinfo_handler(sd_resolve_query *q, int ret, const char *host, const char *serv, void *userdata) {
  42         assert_se(q);
  43
  44         if (ret != 0) {
  45                 log_error("getnameinfo error: %s %i", gai_strerror(ret), ret);
  46                 return 0;
  47         }
  48
  49         printf("Host: %s — Serv: %s\n", strna(host), strna(serv));
  50         return 0;
  51 }
  52
  53 int main(int argc, char *argv[]) {
  54         _cleanup_(sd_resolve_query_unrefp) sd_resolve_query *q1 = NULL, *q2 = NULL;
  55         _cleanup_(sd_resolve_unrefp) sd_resolve *resolve = NULL;
  56         int r = 0;
  57
  58         struct addrinfo hints = {
  59                 .ai_family = PF_UNSPEC,
  60                 .ai_socktype = SOCK_STREAM,
  61                 .ai_flags = AI_CANONNAME
  62         };
  63
  64         struct sockaddr_in sa = {
  65                 .sin_family = AF_INET,
  66                 .sin_port = htons(80)
  67         };
  68
  69         assert_se(sd_resolve_default(&resolve) >= 0);
  70
  71         /* Test a floating resolver query */
  72         r = sd_resolve_getaddrinfo(resolve, NULL, "redhat.com", "http", NULL, getaddrinfo_handler, NULL);
  73         if (r < 0)
  74                 log_error_errno(r, "sd_resolve_getaddrinfo(): %m");
  75
  76         /* Make a name -> address query */
  77         r = sd_resolve_getaddrinfo(resolve, &q1, argc >= 2 ? argv[1] : "www.heise.de", NULL, &hints, getaddrinfo_handler, NULL);
  78         if (r < 0)
  79                 log_error_errno(r, "sd_resolve_getaddrinfo(): %m");
  80
  81         /* Make an address -> name query */
  82         sa.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71");
  83         r = sd_resolve_getnameinfo(resolve, &q2, (struct sockaddr*) &sa, sizeof(sa), 0, SD_RESOLVE_GET_BOTH, getnameinfo_handler, NULL);
  84         if (r < 0)
  85                 log_error_errno(r, "sd_resolve_getnameinfo(): %m");
  86
  87         /* Wait until all queries are completed */
  88         for (;;) {
  89                 r = sd_resolve_wait(resolve, TEST_TIMEOUT_USEC);
  90                 if (r == 0)
  91                         break;
  92                 if (r == -ETIMEDOUT) {
  93                         /* Let's catch timeouts here, so that we can run safely in a CI that has no reliable DNS. Note
  94                          * that we invoke exit() directly here, as the stuck NSS call will not allow us to exit
  95                          * cleanly. */
  96
  97                         log_notice_errno(r, "sd_resolve_wait() timed out, but that's OK");
  98                         exit(EXIT_SUCCESS);
  99                 }
 100                 if (r < 0) {
 101                         log_error_errno(r, "sd_resolve_wait(): %m");
 102                         assert_not_reached("sd_resolve_wait() failed");
 103                 }
 104         }
 105
 106         return 0;
 107 }