sd-dns: initial commit

Origin: <http://0pointer.de/lennart/projects/libasyncns/>

[tomegun: renamed some more files asyncns -> sd-dns and moved to libsystemd-bus as
requested by Lennart]

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;
+}