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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <arpa/inet.h>
#include <errno.h>
#include <netinet/in.h>
#include <resolv.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include "sd-resolve.h"
#include "alloc-util.h"
#include "macro.h"
#include "socket-util.h"
#include "string-util.h"
#include "time-util.h"
#define TEST_TIMEOUT_USEC (20*USEC_PER_SEC)
static int getaddrinfo_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) {
const struct addrinfo *i;
assert_se(q);
if (ret != 0) {
log_error("getaddrinfo error: %s %i", gai_strerror(ret), ret);
return 0;
}
for (i = ai; i; i = i->ai_next) {
_cleanup_free_ char *addr = NULL;
assert_se(sockaddr_pretty(i->ai_addr, i->ai_addrlen, false, true, &addr) == 0);
puts(addr);
}
printf("canonical name: %s\n", strna(ai->ai_canonname));
return 0;
}
static int getnameinfo_handler(sd_resolve_query *q, int ret, const char *host, const char *serv, void *userdata) {
assert_se(q);
if (ret != 0) {
log_error("getnameinfo error: %s %i", gai_strerror(ret), ret);
return 0;
}
printf("Host: %s — Serv: %s\n", strna(host), strna(serv));
return 0;
}
int main(int argc, char *argv[]) {
_cleanup_(sd_resolve_query_unrefp) sd_resolve_query *q1 = NULL, *q2 = NULL;
_cleanup_(sd_resolve_unrefp) sd_resolve *resolve = NULL;
int r = 0;
struct addrinfo hints = {
.ai_family = PF_UNSPEC,
.ai_socktype = SOCK_STREAM,
.ai_flags = AI_CANONNAME
};
struct sockaddr_in sa = {
.sin_family = AF_INET,
.sin_port = htons(80)
};
assert_se(sd_resolve_default(&resolve) >= 0);
/* Test a floating resolver query */
r = sd_resolve_getaddrinfo(resolve, NULL, "redhat.com", "http", NULL, getaddrinfo_handler, NULL);
if (r < 0)
log_error_errno(r, "sd_resolve_getaddrinfo(): %m");
/* Make a name -> address query */
r = sd_resolve_getaddrinfo(resolve, &q1, argc >= 2 ? argv[1] : "www.heise.de", NULL, &hints, getaddrinfo_handler, NULL);
if (r < 0)
log_error_errno(r, "sd_resolve_getaddrinfo(): %m");
/* Make an address -> name query */
sa.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71");
r = sd_resolve_getnameinfo(resolve, &q2, (struct sockaddr*) &sa, sizeof(sa), 0, SD_RESOLVE_GET_BOTH, getnameinfo_handler, NULL);
if (r < 0)
log_error_errno(r, "sd_resolve_getnameinfo(): %m");
/* Wait until all queries are completed */
for (;;) {
r = sd_resolve_wait(resolve, TEST_TIMEOUT_USEC);
if (r == 0)
break;
if (r == -ETIMEDOUT) {
/* Let's catch timeouts here, so that we can run safely in a CI that has no reliable DNS. Note
* that we invoke exit() directly here, as the stuck NSS call will not allow us to exit
* cleanly. */
log_notice_errno(r, "sd_resolve_wait() timed out, but that's OK");
exit(EXIT_SUCCESS);
}
if (r < 0) {
log_error_errno(r, "sd_resolve_wait(): %m");
assert_not_reached("sd_resolve_wait() failed");
}
}
return 0;
}
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