/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2005-2008 Lennart Poettering Copyright 2014 Daniel Buch systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see . ***/ #include #include #include #include #include #include #include #include #include #include #include "socket-util.h" #include "sd-resolve.h" #include "resolve-util.h" #include "macro.h" 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, &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; } static int res_handler(sd_resolve_query *q, int ret, unsigned char *answer, void *userdata) { int qdcount, ancount, len; const unsigned char *pos = answer + sizeof(HEADER); unsigned char *end = answer + ret; HEADER *head = (HEADER *) answer; char name[256]; assert_se(q); if (ret < 0) { log_error("res_query() error: %s %i", strerror(errno), errno); return 0; } if (ret == 0) { log_error("No reply for SRV lookup"); return 0; } qdcount = ntohs(head->qdcount); ancount = ntohs(head->ancount); printf("%d answers for srv lookup:\n", ancount); /* Ignore the questions */ while (qdcount-- > 0 && (len = dn_expand(answer, end, pos, name, 255)) >= 0) { assert_se(len >= 0); pos += len + QFIXEDSZ; } /* Parse the answers */ while (ancount-- > 0 && (len = dn_expand(answer, end, pos, name, 255)) >= 0) { /* Ignore the initial string */ uint16_t pref, weight, port; assert_se(len >= 0); pos += len; /* Ignore type, ttl, class and dlen */ pos += 10; GETSHORT(pref, pos); GETSHORT(weight, pos); GETSHORT(port, pos); len = dn_expand(answer, end, pos, name, 255); printf("\tpreference: %2d weight: %2d port: %d host: %s\n", pref, weight, port, name); pos += len; } return 0; } int main(int argc, char *argv[]) { _cleanup_resolve_query_unref_ sd_resolve_query *q1 = NULL, *q2 = NULL, *q3 = NULL; _cleanup_resolve_unref_ 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 */ sd_resolve_getaddrinfo(resolve, NULL, "redhat.com", "http", NULL, getaddrinfo_handler, NULL); /* 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"); /* Make a res_query() call */ r = sd_resolve_res_query(resolve, &q3, "_xmpp-client._tcp.gmail.com", C_IN, T_SRV, res_handler, NULL); if (r < 0) log_error_errno(r, "sd_resolve_res_query(): %m"); /* Wait until the three queries are completed */ while (sd_resolve_query_is_done(q1) == 0 || sd_resolve_query_is_done(q2) == 0 || sd_resolve_query_is_done(q3) == 0) { r = sd_resolve_wait(resolve, (uint64_t) -1); if (r < 0) { log_error_errno(r, "sd_resolve_wait(): %m"); assert_not_reached("sd_resolve_wait() failed"); } } return 0; }