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 #include <string.h>
   9 #include <sys/socket.h>
  10
  11 #include "sd-resolve.h"
  12
  13 #include "alloc-util.h"
  14 #include "macro.h"
  15 #include "socket-util.h"
  16 #include "string-util.h"
  17
  18 #define TEST_TIMEOUT_USEC (20*USEC_PER_SEC)
  19
  20 static int getaddrinfo_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) {
  21         const struct addrinfo *i;
  22
  23         assert_se(q);
  24
  25         if (ret != 0) {
  26                 log_error("getaddrinfo error: %s %i", gai_strerror(ret), ret);
  27                 return 0;
  28         }
  29
  30         for (i = ai; i; i = i->ai_next) {
  31                 _cleanup_free_ char *addr = NULL;
  32
  33                 assert_se(sockaddr_pretty(i->ai_addr, i->ai_addrlen, false, true, &addr) == 0);
  34                 puts(addr);
  35         }
  36
  37         printf("canonical name: %s\n", strna(ai->ai_canonname));
  38
  39         return 0;
  40 }
  41
  42 static int getnameinfo_handler(sd_resolve_query *q, int ret, const char *host, const char *serv, void *userdata) {
  43         assert_se(q);
  44
  45         if (ret != 0) {
  46                 log_error("getnameinfo error: %s %i", gai_strerror(ret), ret);
  47                 return 0;
  48         }
  49
  50         printf("Host: %s — Serv: %s\n", strna(host), strna(serv));
  51         return 0;
  52 }
  53
  54 int main(int argc, char *argv[]) {
  55         _cleanup_(sd_resolve_query_unrefp) sd_resolve_query *q1 = NULL, *q2 = NULL;
  56         _cleanup_(sd_resolve_unrefp) sd_resolve *resolve = NULL;
  57         int r = 0;
  58
  59         struct addrinfo hints = {
  60                 .ai_family = PF_UNSPEC,
  61                 .ai_socktype = SOCK_STREAM,
  62                 .ai_flags = AI_CANONNAME
  63         };
  64
  65         struct sockaddr_in sa = {
  66                 .sin_family = AF_INET,
  67                 .sin_port = htons(80)
  68         };
  69
  70         assert_se(sd_resolve_default(&resolve) >= 0);
  71
  72         /* Test a floating resolver query */
  73         r = sd_resolve_getaddrinfo(resolve, NULL, "redhat.com", "http", NULL, getaddrinfo_handler, NULL);
  74         if (r < 0)
  75                 log_error_errno(r, "sd_resolve_getaddrinfo(): %m");
  76
  77         /* Make a name -> address query */
  78         r = sd_resolve_getaddrinfo(resolve, &q1, argc >= 2 ? argv[1] : "www.heise.de", NULL, &hints, getaddrinfo_handler, NULL);
  79         if (r < 0)
  80                 log_error_errno(r, "sd_resolve_getaddrinfo(): %m");
  81
  82         /* Make an address -> name query */
  83         sa.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71");
  84         r = sd_resolve_getnameinfo(resolve, &q2, (struct sockaddr*) &sa, sizeof(sa), 0, SD_RESOLVE_GET_BOTH, getnameinfo_handler, NULL);
  85         if (r < 0)
  86                 log_error_errno(r, "sd_resolve_getnameinfo(): %m");
  87
  88         /* Wait until all queries are completed */
  89         for (;;) {
  90                 r = sd_resolve_wait(resolve, TEST_TIMEOUT_USEC);
  91                 if (r == 0)
  92                         break;
  93                 if (r == -ETIMEDOUT) {
  94                         /* Let's catch time-outs here, so that we can run safely in a CI that has no reliable DNS. Note
  95                          * that we invoke exit() directly here, as the stuck NSS call will not allow us to exit
  96                          * cleanly. */
  97
  98                         log_notice_errno(r, "sd_resolve_wait() timed out, but that's OK");
  99                         exit(EXIT_SUCCESS);
 100                 }
 101                 if (r < 0) {
 102                         log_error_errno(r, "sd_resolve_wait(): %m");
 103                         assert_not_reached("sd_resolve_wait() failed");
 104                 }
 105         }
 106
 107         return 0;
 108 }