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