/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include #include #include #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; struct addrinfo hints = { .ai_family = AF_UNSPEC, .ai_socktype = SOCK_STREAM, .ai_flags = AI_CANONNAME, }; union sockaddr_union sa = { .in.sin_family = AF_INET, .in.sin_port = htobe16(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.in.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71"); r = sd_resolve_getnameinfo(resolve, &q2, &sa.sa, SOCKADDR_LEN(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(); } } return 0; }