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

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright 2014 Daniel Buch
   4 ***/
   5
   6 #include <arpa/inet.h>
   7 #include <errno.h>
   8 #include <netinet/in.h>
   9 #include <resolv.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <sys/socket.h>
  13
  14 #include "sd-resolve.h"
  15
  16 #include "alloc-util.h"
  17 #include "macro.h"
  18 #include "socket-util.h"
  19 #include "string-util.h"
  20
  21 #define TEST_TIMEOUT_USEC (20*USEC_PER_SEC)
  22
  23 static int getaddrinfo_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) {
  24         const struct addrinfo *i;
  25
  26         assert_se(q);
  27
  28         if (ret != 0) {
  29                 log_error("getaddrinfo error: %s %i", gai_strerror(ret), ret);
  30                 return 0;
  31         }
  32
  33         for (i = ai; i; i = i->ai_next) {
  34                 _cleanup_free_ char *addr = NULL;
  35
  36                 assert_se(sockaddr_pretty(i->ai_addr, i->ai_addrlen, false, true, &addr) == 0);
  37                 puts(addr);
  38         }
  39
  40         printf("canonical name: %s\n", strna(ai->ai_canonname));
  41
  42         return 0;
  43 }
  44
  45 static int getnameinfo_handler(sd_resolve_query *q, int ret, const char *host, const char *serv, void *userdata) {
  46         assert_se(q);
  47
  48         if (ret != 0) {
  49                 log_error("getnameinfo error: %s %i", gai_strerror(ret), ret);
  50                 return 0;
  51         }
  52
  53         printf("Host: %s — Serv: %s\n", strna(host), strna(serv));
  54         return 0;
  55 }
  56
  57 int main(int argc, char *argv[]) {
  58         _cleanup_(sd_resolve_query_unrefp) sd_resolve_query *q1 = NULL, *q2 = NULL;
  59         _cleanup_(sd_resolve_unrefp) sd_resolve *resolve = NULL;
  60         int r = 0;
  61
  62         struct addrinfo hints = {
  63                 .ai_family = PF_UNSPEC,
  64                 .ai_socktype = SOCK_STREAM,
  65                 .ai_flags = AI_CANONNAME
  66         };
  67
  68         struct sockaddr_in sa = {
  69                 .sin_family = AF_INET,
  70                 .sin_port = htons(80)
  71         };
  72
  73         assert_se(sd_resolve_default(&resolve) >= 0);
  74
  75         /* Test a floating resolver query */
  76         r = sd_resolve_getaddrinfo(resolve, NULL, "redhat.com", "http", NULL, getaddrinfo_handler, NULL);
  77         if (r < 0)
  78                 log_error_errno(r, "sd_resolve_getaddrinfo(): %m");
  79
  80         /* Make a name -> address query */
  81         r = sd_resolve_getaddrinfo(resolve, &q1, argc >= 2 ? argv[1] : "www.heise.de", NULL, &hints, getaddrinfo_handler, NULL);
  82         if (r < 0)
  83                 log_error_errno(r, "sd_resolve_getaddrinfo(): %m");
  84
  85         /* Make an address -> name query */
  86         sa.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71");
  87         r = sd_resolve_getnameinfo(resolve, &q2, (struct sockaddr*) &sa, sizeof(sa), 0, SD_RESOLVE_GET_BOTH, getnameinfo_handler, NULL);
  88         if (r < 0)
  89                 log_error_errno(r, "sd_resolve_getnameinfo(): %m");
  90
  91         /* Wait until all queries are completed */
  92         for (;;) {
  93                 r = sd_resolve_wait(resolve, TEST_TIMEOUT_USEC);
  94                 if (r == 0)
  95                         break;
  96                 if (r == -ETIMEDOUT) {
  97                         /* Let's catch time-outs here, so that we can run safely in a CI that has no reliable DNS. Note
  98                          * that we invoke exit() directly here, as the stuck NSS call will not allow us to exit
  99                          * cleanly. */
 100
 101                         log_notice_errno(r, "sd_resolve_wait() timed out, but that's OK");
 102                         exit(EXIT_SUCCESS);
 103                 }
 104                 if (r < 0) {
 105                         log_error_errno(r, "sd_resolve_wait(): %m");
 106                         assert_not_reached("sd_resolve_wait() failed");
 107                 }
 108         }
 109
 110         return 0;
 111 }