1/*
2 * Copyright (c) 2010-2012 Niels Provos and Nick Mathewson
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 *    derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifdef WIN32
28#include <winsock2.h>
29#include <windows.h>
30#include <ws2tcpip.h>
31#endif
32
33#include "event2/event-config.h"
34
35#include <sys/types.h>
36#include <sys/stat.h>
37#ifdef _EVENT_HAVE_SYS_TIME_H
38#include <sys/time.h>
39#endif
40#include <sys/queue.h>
41#ifndef WIN32
42#include <sys/socket.h>
43#include <signal.h>
44#include <netinet/in.h>
45#include <arpa/inet.h>
46#include <unistd.h>
47#endif
48#ifdef _EVENT_HAVE_NETINET_IN6_H
49#include <netinet/in6.h>
50#endif
51#ifdef HAVE_NETDB_H
52#include <netdb.h>
53#endif
54#include <fcntl.h>
55#include <stdlib.h>
56#include <stdio.h>
57#include <string.h>
58#include <errno.h>
59
60#include "event2/dns.h"
61#include "event2/dns_struct.h"
62#include "event2/event.h"
63#include "event2/event_compat.h"
64#include "event2/util.h"
65#include "event2/listener.h"
66#include "event2/bufferevent.h"
67#include "log-internal.h"
68#include "regress.h"
69#include "regress_testutils.h"
70
71#include "../util-internal.h"
72
73/* globals */
74static struct evdns_server_port *dns_port;
75evutil_socket_t dns_sock = -1;
76
77/* Helper: return the port that a socket is bound on, in host order. */
78int
79regress_get_socket_port(evutil_socket_t fd)
80{
81	struct sockaddr_storage ss;
82	ev_socklen_t socklen = sizeof(ss);
83	if (getsockname(fd, (struct sockaddr*)&ss, &socklen) != 0)
84		return -1;
85	if (ss.ss_family == AF_INET)
86		return ntohs( ((struct sockaddr_in*)&ss)->sin_port);
87	else if (ss.ss_family == AF_INET6)
88		return ntohs( ((struct sockaddr_in6*)&ss)->sin6_port);
89	else
90		return -1;
91}
92
93struct evdns_server_port *
94regress_get_dnsserver(struct event_base *base,
95    ev_uint16_t *portnum,
96    evutil_socket_t *psock,
97    evdns_request_callback_fn_type cb,
98    void *arg)
99{
100	struct evdns_server_port *port = NULL;
101	evutil_socket_t sock;
102	struct sockaddr_in my_addr;
103
104	sock = socket(AF_INET, SOCK_DGRAM, 0);
105	if (sock < 0) {
106		tt_abort_perror("socket");
107	}
108
109	evutil_make_socket_nonblocking(sock);
110
111	memset(&my_addr, 0, sizeof(my_addr));
112	my_addr.sin_family = AF_INET;
113	my_addr.sin_port = htons(*portnum);
114	my_addr.sin_addr.s_addr = htonl(0x7f000001UL);
115	if (bind(sock, (struct sockaddr*)&my_addr, sizeof(my_addr)) < 0) {
116		evutil_closesocket(sock);
117		tt_abort_perror("bind");
118	}
119	port = evdns_add_server_port_with_base(base, sock, 0, cb, arg);
120	if (!*portnum)
121		*portnum = regress_get_socket_port(sock);
122	if (psock)
123		*psock = sock;
124
125	return port;
126end:
127	return NULL;
128}
129
130void
131regress_clean_dnsserver(void)
132{
133	if (dns_port)
134		evdns_close_server_port(dns_port);
135	if (dns_sock >= 0)
136		evutil_closesocket(dns_sock);
137}
138
139void
140regress_dns_server_cb(struct evdns_server_request *req, void *data)
141{
142	struct regress_dns_server_table *tab = data;
143	const char *question;
144
145	if (req->nquestions != 1)
146		TT_DIE(("Only handling one question at a time; got %d",
147			req->nquestions));
148
149	question = req->questions[0]->name;
150
151	while (tab->q && evutil_ascii_strcasecmp(question, tab->q) &&
152	    strcmp("*", tab->q))
153		++tab;
154	if (tab->q == NULL)
155		TT_DIE(("Unexpected question: '%s'", question));
156
157	++tab->seen;
158
159	if (!strcmp(tab->anstype, "err")) {
160		int err = atoi(tab->ans);
161		tt_assert(! evdns_server_request_respond(req, err));
162		return;
163	} else if (!strcmp(tab->anstype, "errsoa")) {
164		int err = atoi(tab->ans);
165		char soa_record[] =
166			"\x04" "dns1" "\x05" "icann" "\x03" "org" "\0"
167			"\x0a" "hostmaster" "\x05" "icann" "\x03" "org" "\0"
168			"\x77\xde\x5e\xba" /* serial */
169			"\x00\x00\x1c\x20" /* refreshtime = 2h */
170			"\x00\x00\x0e\x10" /* retry = 1h */
171			"\x00\x12\x75\x00" /* expiration = 14d */
172			"\x00\x00\x0e\x10" /* min.ttl = 1h */
173			;
174		evdns_server_request_add_reply(
175			req, EVDNS_AUTHORITY_SECTION,
176			"example.com", EVDNS_TYPE_SOA, EVDNS_CLASS_INET,
177			42, sizeof(soa_record) - 1, 0, soa_record);
178		tt_assert(! evdns_server_request_respond(req, err));
179		return;
180	} else if (!strcmp(tab->anstype, "A")) {
181		struct in_addr in;
182		if (!evutil_inet_pton(AF_INET, tab->ans, &in)) {
183			TT_DIE(("Bad A value %s in table", tab->ans));
184		}
185		evdns_server_request_add_a_reply(req, question, 1, &in.s_addr,
186		    100);
187	} else if (!strcmp(tab->anstype, "AAAA")) {
188		struct in6_addr in6;
189		if (!evutil_inet_pton(AF_INET6, tab->ans, &in6)) {
190			TT_DIE(("Bad AAAA value %s in table", tab->ans));
191		}
192		evdns_server_request_add_aaaa_reply(req,
193		    question, 1, &in6.s6_addr, 100);
194	} else {
195		TT_DIE(("Weird table entry with type '%s'", tab->anstype));
196	}
197	tt_assert(! evdns_server_request_respond(req, 0))
198	return;
199end:
200	tt_want(! evdns_server_request_drop(req));
201}
202
203int
204regress_dnsserver(struct event_base *base, ev_uint16_t *port,
205    struct regress_dns_server_table *search_table)
206{
207	dns_port = regress_get_dnsserver(base, port, &dns_sock,
208	    regress_dns_server_cb, search_table);
209	return dns_port != NULL;
210}
211
212int
213regress_get_listener_addr(struct evconnlistener *lev,
214    struct sockaddr *sa, ev_socklen_t *socklen)
215{
216	evutil_socket_t s = evconnlistener_get_fd(lev);
217	if (s <= 0)
218		return -1;
219	return getsockname(s, sa, socklen);
220}
221