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 /*

  * Copyright (c) 2010-2012 Niels Provos and Nick Mathewson

  *

  * 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>

 #include <ws2tcpip.h>

 #endif

 #include "event2/event-config.h"

 #include <sys/types.h>

 #include <sys/stat.h>

 #ifdef _EVENT_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 _EVENT_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 "event2/dns.h"

 #include "event2/dns_struct.h"

 #include "event2/event.h"

 #include "event2/event_compat.h"

 #include "event2/util.h"

 #include "event2/listener.h"

 #include "event2/bufferevent.h"

 #include "log-internal.h"

 #include "regress.h"

 #include "regress_testutils.h"

 #include "../util-internal.h"

 /* globals */

 static struct evdns_server_port *dns_port;

 evutil_socket_t dns_sock = -1;

 /* Helper: return the port that a socket is bound on, in host order. */

 int

 regress_get_socket_port(evutil_socket_t fd)

 {

 	struct sockaddr_storage ss;

 	ev_socklen_t socklen = sizeof(ss);

 	if (getsockname(fd, (struct sockaddr*)&ss, &socklen) != 0)

 		return -1;

 	if (ss.ss_family == AF_INET)

 		return ntohs( ((struct sockaddr_in*)&ss)->sin_port);

 	else if (ss.ss_family == AF_INET6)

 		return ntohs( ((struct sockaddr_in6*)&ss)->sin6_port);

 	else

 		return -1;

 }

 struct evdns_server_port *

 regress_get_dnsserver(struct event_base *base,

     ev_uint16_t *portnum,

     evutil_socket_t *psock,

     evdns_request_callback_fn_type cb,

     void *arg)

 {

 	struct evdns_server_port *port = NULL;

 	evutil_socket_t sock;

 	struct sockaddr_in my_addr;

 	sock = socket(AF_INET, SOCK_DGRAM, 0);

 	if (sock < 0) {

 		tt_abort_perror("socket");

 	}

 	evutil_make_socket_nonblocking(sock);

 	memset(&my_addr, 0, sizeof(my_addr));

 	my_addr.sin_family = AF_INET;

 	my_addr.sin_port = htons(*portnum);

 	my_addr.sin_addr.s_addr = htonl(0x7f000001UL);

 	if (bind(sock, (struct sockaddr*)&my_addr, sizeof(my_addr)) < 0) {

 		evutil_closesocket(sock);

 		tt_abort_perror("bind");

 	}

 	port = evdns_add_server_port_with_base(base, sock, 0, cb, arg);

 	if (!*portnum)

 		*portnum = regress_get_socket_port(sock);

 	if (psock)

 		*psock = sock;

 	return port;

 end:

 	return NULL;

 }

 void

 regress_clean_dnsserver(void)

 {

 	if (dns_port)

 		evdns_close_server_port(dns_port);

 	if (dns_sock >= 0)

 		evutil_closesocket(dns_sock);

 }

 void

 regress_dns_server_cb(struct evdns_server_request *req, void *data)

 {

 	struct regress_dns_server_table *tab = data;

 	const char *question;

 	if (req->nquestions != 1)

 		TT_DIE(("Only handling one question at a time; got %d",

 			req->nquestions));

 	question = req->questions[0]->name;

 	while (tab->q && evutil_ascii_strcasecmp(question, tab->q) &&

 	    strcmp("*", tab->q))

 		++tab;

 	if (tab->q == NULL)

 		TT_DIE(("Unexpected question: '%s'", question));

 	++tab->seen;

 	if (!strcmp(tab->anstype, "err")) {

 		int err = atoi(tab->ans);

 		tt_assert(! evdns_server_request_respond(req, err));

 		return;

 	} else if (!strcmp(tab->anstype, "errsoa")) {

 		int err = atoi(tab->ans);

 		char soa_record[] =

 			"\x04" "dns1" "\x05" "icann" "\x03" "org" "\0"

 			"\x0a" "hostmaster" "\x05" "icann" "\x03" "org" "\0"

 			"\x77\xde\x5e\xba" /* serial */

 			"\x00\x00\x1c\x20" /* refreshtime = 2h */

 			"\x00\x00\x0e\x10" /* retry = 1h */

 			"\x00\x12\x75\x00" /* expiration = 14d */

 			"\x00\x00\x0e\x10" /* min.ttl = 1h */

 			;

 		evdns_server_request_add_reply(

 			req, EVDNS_AUTHORITY_SECTION,

 			"example.com", EVDNS_TYPE_SOA, EVDNS_CLASS_INET,

 			42, sizeof(soa_record) - 1, 0, soa_record);

 		tt_assert(! evdns_server_request_respond(req, err));

 		return;

 	} else if (!strcmp(tab->anstype, "A")) {

 		struct in_addr in;

 		if (!evutil_inet_pton(AF_INET, tab->ans, &in)) {

 			TT_DIE(("Bad A value %s in table", tab->ans));

 		}

 		evdns_server_request_add_a_reply(req, question, 1, &in.s_addr,

 		    100);

 	} else if (!strcmp(tab->anstype, "AAAA")) {

 		struct in6_addr in6;

 		if (!evutil_inet_pton(AF_INET6, tab->ans, &in6)) {

 			TT_DIE(("Bad AAAA value %s in table", tab->ans));

 		}

 		evdns_server_request_add_aaaa_reply(req,

 		    question, 1, &in6.s6_addr, 100);

 	} else {

 		TT_DIE(("Weird table entry with type '%s'", tab->anstype));

 	}

 	tt_assert(! evdns_server_request_respond(req, 0))

 	return;

 end:

 	tt_want(! evdns_server_request_drop(req));

 }

 int

 regress_dnsserver(struct event_base *base, ev_uint16_t *port,

     struct regress_dns_server_table *search_table)

 {

 	dns_port = regress_get_dnsserver(base, port, &dns_sock,

 	    regress_dns_server_cb, search_table);

 	return dns_port != NULL;

 }

 int

 regress_get_listener_addr(struct evconnlistener *lev,

     struct sockaddr *sa, ev_socklen_t *socklen)

 {

 	evutil_socket_t s = evconnlistener_get_fd(lev);

 	if (s <= 0)

 		return -1;

 	return getsockname(s, sa, socklen);

 }