diff options
Diffstat (limited to 'src/libsystemd-bus/test-dns.c')
| -rw-r--r-- | src/libsystemd-bus/test-dns.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/libsystemd-bus/test-dns.c b/src/libsystemd-bus/test-dns.c new file mode 100644 index 0000000000..56654ec047 --- /dev/null +++ b/src/libsystemd-bus/test-dns.c @@ -0,0 +1,164 @@ +/*** + This file is part of libasyncns. + + Copyright 2005-2008 Lennart Poettering + + libasyncns 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. + + libasyncns 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 libasyncns. If not, see + <http://www.gnu.org/licenses/>. + ***/ + +#if HAVE_CONFIG_H +#include <config.h> +#endif + +#include <string.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <arpa/inet.h> +#include <stdio.h> +#include <netinet/in.h> +#include <arpa/nameser.h> +#include <resolv.h> +#include <assert.h> +#include <signal.h> +#include <errno.h> + +#include "sd-dns.h" +#include "dns-util.h" +#include "macro.h" + +int main(int argc, char *argv[]) { + int r = 1, ret; + _cleanup_asyncns_free_ asyncns_t *asyncns = NULL; + _cleanup_asyncns_addrinfo_free_ struct addrinfo *ai = NULL; + _cleanup_asyncns_answer_free_ unsigned char *srv = NULL; + asyncns_query_t *q1, *q2, *q3; + struct addrinfo hints = {}; + struct sockaddr_in sa = {}; + char host[NI_MAXHOST] = "", serv[NI_MAXSERV] = ""; + + signal(SIGCHLD, SIG_IGN); + + asyncns = asyncns_new(2); + if (!asyncns) + log_oom(); + + /* Make a name -> address query */ + hints.ai_family = PF_UNSPEC; + hints.ai_socktype = SOCK_STREAM; + + q1 = asyncns_getaddrinfo(asyncns, argc >= 2 ? argv[1] : "www.heise.de", NULL, &hints); + + if (!q1) + fprintf(stderr, "asyncns_getaddrinfo(): %s\n", strerror(errno)); + + /* Make an address -> name query */ + sa.sin_family = AF_INET; + sa.sin_addr.s_addr = inet_addr(argc >= 3 ? argv[2] : "193.99.144.71"); + sa.sin_port = htons(80); + + q2 = asyncns_getnameinfo(asyncns, (struct sockaddr*) &sa, sizeof(sa), 0, 1, 1); + + if (!q2) + fprintf(stderr, "asyncns_getnameinfo(): %s\n", strerror(errno)); + + /* Make a res_query() call */ + q3 = asyncns_res_query(asyncns, "_xmpp-client._tcp.gmail.com", C_IN, T_SRV); + + if (!q3) + fprintf(stderr, "asyncns_res_query(): %s\n", strerror(errno)); + + /* Wait until the three queries are completed */ + while (!asyncns_isdone(asyncns, q1) + || !asyncns_isdone(asyncns, q2) + || !asyncns_isdone(asyncns, q3)) { + if (asyncns_wait(asyncns, 1) < 0) { + fprintf(stderr, "asyncns_wait(): %s\n", strerror(errno)); + } + } + + /* Interpret the result of the name -> addr query */ + if ((ret = asyncns_getaddrinfo_done(asyncns, q1, &ai))) + fprintf(stderr, "error: %s %i\n", gai_strerror(ret), ret); + else { + struct addrinfo *i; + + for (i = ai; i; i = i->ai_next) { + char t[256]; + const char *p = NULL; + + if (i->ai_family == PF_INET) + p = inet_ntop(AF_INET, &((struct sockaddr_in*) i->ai_addr)->sin_addr, t, sizeof(t)); + else if (i->ai_family == PF_INET6) + p = inet_ntop(AF_INET6, &((struct sockaddr_in6*) i->ai_addr)->sin6_addr, t, sizeof(t)); + + printf("%s\n", p); + } + } + + /* Interpret the result of the addr -> name query */ + if ((ret = asyncns_getnameinfo_done(asyncns, q2, host, sizeof(host), serv, sizeof(serv)))) + fprintf(stderr, "error: %s %i\n", gai_strerror(ret), ret); + else + printf("%s -- %s\n", host, serv); + + /* Interpret the result of the SRV lookup */ + if ((ret = asyncns_res_done(asyncns, q3, &srv)) < 0) { + fprintf(stderr, "error: %s %i\n", strerror(errno), ret); + } else if (ret == 0) { + fprintf(stderr, "No reply for SRV lookup\n"); + } else { + int qdcount; + int ancount; + int len; + const unsigned char *pos = srv + sizeof(HEADER); + unsigned char *end = srv + ret; + HEADER *head = (HEADER *)srv; + char name[256]; + + 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(srv, end, pos, name, 255)) >= 0) { + assert(len >= 0); + pos += len + QFIXEDSZ; + } + + /* Parse the answers */ + while (ancount-- > 0 && (len = dn_expand(srv, end, pos, name, 255)) >= 0) { + /* Ignore the initial string */ + uint16_t pref, weight, port; + assert(len >= 0); + pos += len; + /* Ignore type, ttl, class and dlen */ + pos += 10; + + GETSHORT(pref, pos); + GETSHORT(weight, pos); + GETSHORT(port, pos); + len = dn_expand(srv, end, pos, name, 255); + printf("\tpreference: %2d weight: %2d port: %d host: %s\n", + pref, weight, port, name); + + pos += len; + } + } + + r = 0; + + return r; +} |