regress_dns.c

/*
 * Copyright (c) 2003-2006 Niels Provos <provos@citi.umich.edu>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef WIN32
#include <winsock2.h>
#include <windows.h>
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <sys/queue.h>
#ifndef WIN32
#include <sys/socket.h>
#include <signal.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#endif
#ifdef HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

#include "event.h"
#include "evdns.h"
#include "log.h"

static int dns_ok = 0;
static int dns_err = 0;

void dns_suite(void);

static void
dns_gethostbyname_cb(int result, char type, int count, int ttl,
    void *addresses, void *arg)
{
        dns_ok = dns_err = 0;

        if (result == DNS_ERR_TIMEOUT) {
                fprintf(stdout, "[Timed out] ");
                dns_err = result;
                goto out;
        }

        if (result != DNS_ERR_NONE) {
                fprintf(stdout, "[Error code %d] ", result);
                goto out;
        }

        fprintf(stderr, "type: %d, count: %d, ttl: %d: ", type, count, ttl);

        switch (type) {
        case DNS_IPv6_AAAA: {
#if defined(HAVE_STRUCT_IN6_ADDR) && defined(HAVE_INET_NTOP) && defined(INET6_ADDRSTRLEN)
                struct in6_addr *in6_addrs = addresses;
                char buf[INET6_ADDRSTRLEN+1];
                int i;
                /* a resolution that's not valid does not help */
                if (ttl < 0)
                        goto out;
                for (i = 0; i < count; ++i) {
                        const char *b = inet_ntop(AF_INET6, &in6_addrs[i], buf,sizeof(buf));
                        if (b)
                                fprintf(stderr, "%s ", b);
                        else
                                fprintf(stderr, "%s ", strerror(errno));
                }
#endif
                break;
        }
        case DNS_IPv4_A: {
                struct in_addr *in_addrs = addresses;
                int i;
                /* a resolution that's not valid does not help */
                if (ttl < 0)
                        goto out;
                for (i = 0; i < count; ++i)
                        fprintf(stderr, "%s ", inet_ntoa(in_addrs[i]));
                break;
        }
        case DNS_PTR:
                /* may get at most one PTR */
                if (count != 1)
                        goto out;

                fprintf(stderr, "%s ", *(char **)addresses);
                break;
        default:
                goto out;
        }

        dns_ok = type;

out:
        event_loopexit(NULL);
}

static void
dns_gethostbyname(void)
{
        fprintf(stdout, "Simple DNS resolve: ");
        dns_ok = 0;
        evdns_resolve_ipv4("www.monkey.org", 0, dns_gethostbyname_cb, NULL);
        event_dispatch();

        if (dns_ok == DNS_IPv4_A) {
                fprintf(stdout, "OK\n");
        } else {
                fprintf(stdout, "FAILED\n");
                exit(1);
        }
}

static void
dns_gethostbyname6(void)
{
        fprintf(stdout, "IPv6 DNS resolve: ");
        dns_ok = 0;
        evdns_resolve_ipv6("www.ietf.org", 0, dns_gethostbyname_cb, NULL);
        event_dispatch();

        if (dns_ok == DNS_IPv6_AAAA) {
                fprintf(stdout, "OK\n");
        } else if (!dns_ok && dns_err == DNS_ERR_TIMEOUT) {
                fprintf(stdout, "SKIPPED\n");
        } else {
                fprintf(stdout, "FAILED (%d)\n", dns_ok);
                exit(1);
        }
}

static void
dns_gethostbyaddr(void)
{
        struct in_addr in;
        in.s_addr = htonl(0x7f000001ul); /* 127.0.0.1 */
        fprintf(stdout, "Simple reverse DNS resolve: ");
        dns_ok = 0;
        evdns_resolve_reverse(&in, 0, dns_gethostbyname_cb, NULL);
        event_dispatch();

        if (dns_ok == DNS_PTR) {
                fprintf(stdout, "OK\n");
        } else {
                fprintf(stdout, "FAILED\n");
                exit(1);
        }
}

static int n_server_responses = 0;

static void
dns_server_request_cb(struct evdns_server_request *req, void *data)
{
        int i, r;
        const char TEST_ARPA[] = "11.11.168.192.in-addr.arpa";
        for (i = 0; i < req->nquestions; ++i) {
                struct in_addr ans;
                ans.s_addr = htonl(0xc0a80b0bUL); /* 192.168.11.11 */
                if (req->questions[i]->type == EVDNS_TYPE_A &&
                        req->questions[i]->dns_question_class == EVDNS_CLASS_INET &&
                        !strcmp(req->questions[i]->name, "zz.example.com")) {
                        r = evdns_server_request_add_a_reply(req, "zz.example.com",
                                                                                                 1, &ans.s_addr, 12345);
                        if (r<0)
                                dns_ok = 0;
                } else if (req->questions[i]->type == EVDNS_TYPE_AAAA &&
                                   req->questions[i]->dns_question_class == EVDNS_CLASS_INET &&
                                   !strcmp(req->questions[i]->name, "zz.example.com")) {
                        char addr6[17] = "abcdefghijklmnop";
                        r = evdns_server_request_add_aaaa_reply(req, "zz.example.com",
                                                                                                 1, addr6, 123);
                        if (r<0)
                                dns_ok = 0;
                } else if (req->questions[i]->type == EVDNS_TYPE_PTR &&
                                   req->questions[i]->dns_question_class == EVDNS_CLASS_INET &&
                                   !strcmp(req->questions[i]->name, TEST_ARPA)) {
                        r = evdns_server_request_add_ptr_reply(req, NULL, TEST_ARPA,
                                           "ZZ.EXAMPLE.COM", 54321);
                        if (r<0)
                                dns_ok = 0;
                } else {
                        fprintf(stdout, "Unexpected question %d %d \"%s\" ",
                                        req->questions[i]->type,
                                        req->questions[i]->dns_question_class,
                                        req->questions[i]->name);
                        dns_ok = 0;
                }
        }
        r = evdns_server_request_respond(req, 0);
        if (r<0) {
                fprintf(stdout, "Couldn't send reply. ");
                dns_ok = 0;
        }
}

static void
dns_server_gethostbyname_cb(int result, char type, int count, int ttl,
                                                        void *addresses, void *arg)
{
        if (result != DNS_ERR_NONE) {
                fprintf(stdout, "Unexpected result %d. ", result);
                dns_ok = 0;
                goto out;
        }
        if (count != 1) {
                fprintf(stdout, "Unexpected answer count %d. ", count);
                dns_ok = 0;
                goto out;
        }
        switch (type) {
        case DNS_IPv4_A: {
                struct in_addr *in_addrs = addresses;
                if (in_addrs[0].s_addr != htonl(0xc0a80b0bUL) || ttl != 12345) {
                        fprintf(stdout, "Bad IPv4 response \"%s\" %d. ",
                                        inet_ntoa(in_addrs[0]), ttl);
                        dns_ok = 0;
                        goto out;
                }
                break;
        }
        case DNS_IPv6_AAAA: {
#if defined (HAVE_STRUCT_IN6_ADDR) && defined(HAVE_INET_NTOP) && defined(INET6_ADDRSTRLEN)
                struct in6_addr *in6_addrs = addresses;
                char buf[INET6_ADDRSTRLEN+1];
                if (memcmp(&in6_addrs[0].s6_addr, "abcdefghijklmnop", 16)
                        || ttl != 123) {
                        const char *b = inet_ntop(AF_INET6, &in6_addrs[0],buf,sizeof(buf));
                        fprintf(stdout, "Bad IPv6 response \"%s\" %d. ", b, ttl);
                        dns_ok = 0;
                        goto out;
                }
#endif
                break;
        }
        case DNS_PTR: {
                char **addrs = addresses;
                if (strcmp(addrs[0], "ZZ.EXAMPLE.COM") || ttl != 54321) {
                        fprintf(stdout, "Bad PTR response \"%s\" %d. ",
                                        addrs[0], ttl);
                        dns_ok = 0;
                        goto out;
                }
                break;
        }
        default:
                fprintf(stdout, "Bad response type %d. ", type);
                dns_ok = 0;
        }

 out:
        if (++n_server_responses == 3) {
                event_loopexit(NULL);
        }
}

static void
dns_server(void)
{
        int sock;
        struct sockaddr_in my_addr;
        struct evdns_server_port *port;
        struct in_addr resolve_addr;

        dns_ok = 1;
        fprintf(stdout, "DNS server support: ");

        /* Add ourself as the only nameserver, and make sure we really are
         * the only nameserver. */
        evdns_nameserver_ip_add("127.0.0.1:35353");
        if (evdns_count_nameservers() != 1) {
                fprintf(stdout, "Couldn't set up.\n");
                exit(1);
        }

        /* Now configure a nameserver port. */
        sock = socket(AF_INET, SOCK_DGRAM, 0);
        if (sock == -1) {
                perror("socket");
                exit(1);
        }
#ifdef WIN32
        {
                u_long nonblocking = 1;
                ioctlsocket(sock, FIONBIO, &nonblocking);
        }
#else
        fcntl(sock, F_SETFL, O_NONBLOCK);
#endif
        memset(&my_addr, 0, sizeof(my_addr));
        my_addr.sin_family = AF_INET;
        my_addr.sin_port = htons(35353);
        my_addr.sin_addr.s_addr = htonl(0x7f000001UL);
        if (bind(sock, (struct sockaddr*)&my_addr, sizeof(my_addr)) < 0) {
                perror("bind");
                exit (1);
        }
        port = evdns_add_server_port(sock, 0, dns_server_request_cb, NULL);

        /* Send two queries. */
        evdns_resolve_ipv4("zz.example.com", DNS_QUERY_NO_SEARCH,
                                           dns_server_gethostbyname_cb, NULL);
        evdns_resolve_ipv6("zz.example.com", DNS_QUERY_NO_SEARCH,
                                           dns_server_gethostbyname_cb, NULL);
        resolve_addr.s_addr = htonl(0xc0a80b0bUL); /* 192.168.11.11 */
        evdns_resolve_reverse(&resolve_addr, 0,
                                                  dns_server_gethostbyname_cb, NULL);

        event_dispatch();

        if (dns_ok) {
                fprintf(stdout, "OK\n");
        } else {
                fprintf(stdout, "FAILED\n");
                exit(1);
        }

        evdns_close_server_port(port);
        evdns_shutdown(0); /* remove ourself as nameserver. */
#ifdef WIN32
        closesocket(sock);
#else
        close(sock);
#endif
}

void
dns_suite(void)
{
        dns_server(); /* Do this before we call evdns_init. */

        evdns_init();
        dns_gethostbyname();
        dns_gethostbyname6();
        dns_gethostbyaddr();

        evdns_shutdown(0);
}