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regress_dns.c
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/*
* Copyright (c) 2003-2007 Niels Provos <[email protected]>
* Copyright (c) 2007-2012 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.
*/
#include "../util-internal.h"
#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>
#ifdef EVENT__HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#include "event2/dns.h"
#include "event2/dns_compat.h"
#include "event2/dns_struct.h"
#include "event2/event.h"
#include "event2/event_compat.h"
#include "event2/event_struct.h"
#include "event2/util.h"
#include "event2/listener.h"
#include "event2/bufferevent.h"
#include <event2/thread.h>
#include "log-internal.h"
#include "evthread-internal.h"
#include "regress.h"
#include "regress_testutils.h"
#include "regress_thread.h"
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
static int dns_ok = 0;
static int dns_got_cancel = 0;
static int dns_err = 0;
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) {
printf("[Timed out] ");
dns_err = result;
goto out;
}
if (result != DNS_ERR_NONE) {
printf("[Error code %d] ", result);
goto out;
}
TT_BLATHER(("type: %d, count: %d, ttl: %d: ", type, count, ttl));
switch (type) {
case DNS_IPv6_AAAA: {
#if defined(EVENT__HAVE_STRUCT_IN6_ADDR) && defined(EVENT__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 = evutil_inet_ntop(AF_INET6, &in6_addrs[i], buf,sizeof(buf));
if (b)
TT_BLATHER(("%s ", b));
else
TT_BLATHER(("%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)
TT_BLATHER(("%s ", inet_ntoa(in_addrs[i])));
break;
}
case DNS_PTR:
/* may get at most one PTR */
if (count != 1)
goto out;
TT_BLATHER(("%s ", *(char **)addresses));
break;
default:
goto out;
}
dns_ok = type;
out:
if (arg == NULL)
event_loopexit(NULL);
else
event_base_loopexit((struct event_base *)arg, NULL);
}
static void
dns_gethostbyname(void)
{
dns_ok = 0;
evdns_resolve_ipv4("www.monkey.org", 0, dns_gethostbyname_cb, NULL);
event_dispatch();
tt_int_op(dns_ok, ==, DNS_IPv4_A);
test_ok = dns_ok;
end:
;
}
static void
dns_gethostbyname6(void)
{
dns_ok = 0;
evdns_resolve_ipv6("www.ietf.org", 0, dns_gethostbyname_cb, NULL);
event_dispatch();
if (!dns_ok && dns_err == DNS_ERR_TIMEOUT) {
tt_skip();
}
tt_int_op(dns_ok, ==, DNS_IPv6_AAAA);
test_ok = 1;
end:
;
}
static void
dns_gethostbyaddr(void)
{
struct in_addr in;
in.s_addr = htonl(0x7f000001ul); /* 127.0.0.1 */
dns_ok = 0;
evdns_resolve_reverse(&in, 0, dns_gethostbyname_cb, NULL);
event_dispatch();
tt_int_op(dns_ok, ==, DNS_PTR);
test_ok = dns_ok;
end:
;
}
static void
dns_resolve_reverse(void *ptr)
{
struct in_addr in;
struct event_base *base = event_base_new();
struct evdns_base *dns = evdns_base_new(base, 1/* init name servers */);
struct evdns_request *req = NULL;
tt_assert(base);
tt_assert(dns);
in.s_addr = htonl(0x7f000001ul); /* 127.0.0.1 */
dns_ok = 0;
req = evdns_base_resolve_reverse(
dns, &in, 0, dns_gethostbyname_cb, base);
tt_assert(req);
event_base_dispatch(base);
tt_int_op(dns_ok, ==, DNS_PTR);
end:
if (dns)
evdns_base_free(dns, 0);
if (base)
event_base_free(base);
}
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";
const char TEST_IN6[] =
"f.e.f.e." "0.0.0.0." "0.0.0.0." "1.1.1.1."
"a.a.a.a." "0.0.0.0." "0.0.0.0." "0.f.f.f.ip6.arpa";
for (i = 0; i < req->nquestions; ++i) {
const int qtype = req->questions[i]->type;
const int qclass = req->questions[i]->dns_question_class;
const char *qname = req->questions[i]->name;
struct in_addr ans;
ans.s_addr = htonl(0xc0a80b0bUL); /* 192.168.11.11 */
if (qtype == EVDNS_TYPE_A &&
qclass == EVDNS_CLASS_INET &&
!evutil_ascii_strcasecmp(qname, "zz.example.com")) {
r = evdns_server_request_add_a_reply(req, qname,
1, &ans.s_addr, 12345);
if (r<0)
dns_ok = 0;
} else if (qtype == EVDNS_TYPE_AAAA &&
qclass == EVDNS_CLASS_INET &&
!evutil_ascii_strcasecmp(qname, "zz.example.com")) {
char addr6[17] = "abcdefghijklmnop";
r = evdns_server_request_add_aaaa_reply(req,
qname, 1, addr6, 123);
if (r<0)
dns_ok = 0;
} else if (qtype == EVDNS_TYPE_PTR &&
qclass == EVDNS_CLASS_INET &&
!evutil_ascii_strcasecmp(qname, TEST_ARPA)) {
r = evdns_server_request_add_ptr_reply(req, NULL,
qname, "ZZ.EXAMPLE.COM", 54321);
if (r<0)
dns_ok = 0;
} else if (qtype == EVDNS_TYPE_PTR &&
qclass == EVDNS_CLASS_INET &&
!evutil_ascii_strcasecmp(qname, TEST_IN6)){
r = evdns_server_request_add_ptr_reply(req, NULL,
qname,
"ZZ-INET6.EXAMPLE.COM", 54322);
if (r<0)
dns_ok = 0;
} else if (qtype == EVDNS_TYPE_A &&
qclass == EVDNS_CLASS_INET &&
!evutil_ascii_strcasecmp(qname, "drop.example.com")) {
if (evdns_server_request_drop(req)<0)
dns_ok = 0;
return;
} else {
printf("Unexpected question %d %d \"%s\" ",
qtype, qclass, qname);
dns_ok = 0;
}
}
r = evdns_server_request_respond(req, 0);
if (r<0) {
printf("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_CANCEL) {
if (arg != (void*)(char*)90909) {
printf("Unexpected cancelation");
dns_ok = 0;
}
dns_got_cancel = 1;
goto out;
}
if (result != DNS_ERR_NONE) {
printf("Unexpected result %d. ", result);
dns_ok = 0;
goto out;
}
if (count != 1) {
printf("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) {
printf("Bad IPv4 response \"%s\" %d. ",
inet_ntoa(in_addrs[0]), ttl);
dns_ok = 0;
goto out;
}
break;
}
case DNS_IPv6_AAAA: {
#if defined (EVENT__HAVE_STRUCT_IN6_ADDR) && defined(EVENT__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 = evutil_inet_ntop(AF_INET6, &in6_addrs[0],buf,sizeof(buf));
printf("Bad IPv6 response \"%s\" %d. ", b, ttl);
dns_ok = 0;
goto out;
}
#endif
break;
}
case DNS_PTR: {
char **addrs = addresses;
if (arg != (void*)6) {
if (strcmp(addrs[0], "ZZ.EXAMPLE.COM") ||
ttl != 54321) {
printf("Bad PTR response \"%s\" %d. ",
addrs[0], ttl);
dns_ok = 0;
goto out;
}
} else {
if (strcmp(addrs[0], "ZZ-INET6.EXAMPLE.COM") ||
ttl != 54322) {
printf("Bad ipv6 PTR response \"%s\" %d. ",
addrs[0], ttl);
dns_ok = 0;
goto out;
}
}
break;
}
default:
printf("Bad response type %d. ", type);
dns_ok = 0;
}
out:
if (++n_server_responses == 3) {
event_loopexit(NULL);
}
}
static void
dns_server(void)
{
evutil_socket_t sock=-1;
struct sockaddr_in my_addr;
struct sockaddr_storage ss;
ev_socklen_t slen;
struct evdns_server_port *port=NULL;
struct in_addr resolve_addr;
struct in6_addr resolve_addr6;
struct evdns_base *base=NULL;
struct evdns_request *req=NULL;
dns_ok = 1;
base = evdns_base_new(NULL, 0);
/* Now configure a nameserver port. */
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 = 0; /* kernel picks */
my_addr.sin_addr.s_addr = htonl(0x7f000001UL);
if (bind(sock, (struct sockaddr*)&my_addr, sizeof(my_addr)) < 0) {
tt_abort_perror("bind");
}
slen = sizeof(ss);
if (getsockname(sock, (struct sockaddr*)&ss, &slen) < 0) {
tt_abort_perror("getsockname");
}
port = evdns_add_server_port(sock, 0, dns_server_request_cb, NULL);
/* Add ourself as the only nameserver, and make sure we really are
* the only nameserver. */
evdns_base_nameserver_sockaddr_add(base, (struct sockaddr*)&ss, slen, 0);
tt_int_op(evdns_base_count_nameservers(base), ==, 1);
{
struct sockaddr_storage ss2;
int slen2;
memset(&ss2, 0, sizeof(ss2));
slen2 = evdns_base_get_nameserver_addr(base, 0, (struct sockaddr *)&ss2, 3);
tt_int_op(slen2, ==, slen);
tt_int_op(ss2.ss_family, ==, 0);
slen2 = evdns_base_get_nameserver_addr(base, 0, (struct sockaddr *)&ss2, sizeof(ss2));
tt_int_op(slen2, ==, slen);
tt_mem_op(&ss2, ==, &ss, slen);
slen2 = evdns_base_get_nameserver_addr(base, 1, (struct sockaddr *)&ss2, sizeof(ss2));
tt_int_op(-1, ==, slen2);
}
/* Send some queries. */
evdns_base_resolve_ipv4(base, "zz.example.com", DNS_QUERY_NO_SEARCH,
dns_server_gethostbyname_cb, NULL);
evdns_base_resolve_ipv6(base, "zz.example.com", DNS_QUERY_NO_SEARCH,
dns_server_gethostbyname_cb, NULL);
resolve_addr.s_addr = htonl(0xc0a80b0bUL); /* 192.168.11.11 */
evdns_base_resolve_reverse(base, &resolve_addr, 0,
dns_server_gethostbyname_cb, NULL);
memcpy(resolve_addr6.s6_addr,
"\xff\xf0\x00\x00\x00\x00\xaa\xaa"
"\x11\x11\x00\x00\x00\x00\xef\xef", 16);
evdns_base_resolve_reverse_ipv6(base, &resolve_addr6, 0,
dns_server_gethostbyname_cb, (void*)6);
req = evdns_base_resolve_ipv4(base,
"drop.example.com", DNS_QUERY_NO_SEARCH,
dns_server_gethostbyname_cb, (void*)(char*)90909);
evdns_cancel_request(base, req);
event_dispatch();
tt_assert(dns_got_cancel);
test_ok = dns_ok;
end:
if (port)
evdns_close_server_port(port);
if (sock >= 0)
evutil_closesocket(sock);
if (base)
evdns_base_free(base, 0);
}
static int n_replies_left;
static struct event_base *exit_base;
static struct evdns_server_port *exit_port;
struct generic_dns_callback_result {
int result;
char type;
int count;
int ttl;
size_t addrs_len;
void *addrs;
char addrs_buf[256];
};
static void
generic_dns_callback(int result, char type, int count, int ttl, void *addresses,
void *arg)
{
size_t len;
struct generic_dns_callback_result *res = arg;
res->result = result;
res->type = type;
res->count = count;
res->ttl = ttl;
if (type == DNS_IPv4_A)
len = count * 4;
else if (type == DNS_IPv6_AAAA)
len = count * 16;
else if (type == DNS_PTR)
len = strlen(addresses)+1;
else {
res->addrs_len = len = 0;
res->addrs = NULL;
}
if (len) {
res->addrs_len = len;
if (len > 256)
len = 256;
memcpy(res->addrs_buf, addresses, len);
res->addrs = res->addrs_buf;
}
--n_replies_left;
if (n_replies_left == 0) {
if (exit_port) {
evdns_close_server_port(exit_port);
exit_port = NULL;
} else
event_base_loopexit(exit_base, NULL);
}
}
static struct regress_dns_server_table search_table[] = {
{ "host.a.example.com", "err", "3", 0, 0 },
{ "host.b.example.com", "err", "3", 0, 0 },
{ "host.c.example.com", "A", "11.22.33.44", 0, 0 },
{ "host2.a.example.com", "err", "3", 0, 0 },
{ "host2.b.example.com", "A", "200.100.0.100", 0, 0 },
{ "host2.c.example.com", "err", "3", 0, 0 },
{ "hostn.a.example.com", "errsoa", "0", 0, 0 },
{ "hostn.b.example.com", "errsoa", "3", 0, 0 },
{ "hostn.c.example.com", "err", "0", 0, 0 },
{ "host", "err", "3", 0, 0 },
{ "host2", "err", "3", 0, 0 },
{ "*", "err", "3", 0, 0 },
{ NULL, NULL, NULL, 0, 0 }
};
static void
dns_search_test_impl(void *arg, int lower)
{
struct regress_dns_server_table table[ARRAY_SIZE(search_table)];
struct basic_test_data *data = arg;
struct event_base *base = data->base;
struct evdns_base *dns = NULL;
ev_uint16_t portnum = 0;
char buf[64];
struct generic_dns_callback_result r[8];
size_t i;
for (i = 0; i < ARRAY_SIZE(table); ++i) {
table[i] = search_table[i];
table[i].lower = lower;
}
tt_assert(regress_dnsserver(base, &portnum, table));
evutil_snprintf(buf, sizeof(buf), "127.0.0.1:%d", (int)portnum);
dns = evdns_base_new(base, 0);
tt_assert(!evdns_base_nameserver_ip_add(dns, buf));
evdns_base_search_add(dns, "a.example.com");
evdns_base_search_add(dns, "b.example.com");
evdns_base_search_add(dns, "c.example.com");
n_replies_left = ARRAY_SIZE(r);
exit_base = base;
evdns_base_resolve_ipv4(dns, "host", 0, generic_dns_callback, &r[0]);
evdns_base_resolve_ipv4(dns, "host2", 0, generic_dns_callback, &r[1]);
evdns_base_resolve_ipv4(dns, "host", DNS_NO_SEARCH, generic_dns_callback, &r[2]);
evdns_base_resolve_ipv4(dns, "host2", DNS_NO_SEARCH, generic_dns_callback, &r[3]);
evdns_base_resolve_ipv4(dns, "host3", 0, generic_dns_callback, &r[4]);
evdns_base_resolve_ipv4(dns, "hostn.a.example.com", DNS_NO_SEARCH, generic_dns_callback, &r[5]);
evdns_base_resolve_ipv4(dns, "hostn.b.example.com", DNS_NO_SEARCH, generic_dns_callback, &r[6]);
evdns_base_resolve_ipv4(dns, "hostn.c.example.com", DNS_NO_SEARCH, generic_dns_callback, &r[7]);
event_base_dispatch(base);
tt_int_op(r[0].type, ==, DNS_IPv4_A);
tt_int_op(r[0].count, ==, 1);
tt_int_op(((ev_uint32_t*)r[0].addrs)[0], ==, htonl(0x0b16212c));
tt_int_op(r[1].type, ==, DNS_IPv4_A);
tt_int_op(r[1].count, ==, 1);
tt_int_op(((ev_uint32_t*)r[1].addrs)[0], ==, htonl(0xc8640064));
tt_int_op(r[2].result, ==, DNS_ERR_NOTEXIST);
tt_int_op(r[3].result, ==, DNS_ERR_NOTEXIST);
tt_int_op(r[4].result, ==, DNS_ERR_NOTEXIST);
tt_int_op(r[5].result, ==, DNS_ERR_NODATA);
tt_int_op(r[5].ttl, ==, 42);
tt_int_op(r[6].result, ==, DNS_ERR_NOTEXIST);
tt_int_op(r[6].ttl, ==, 42);
tt_int_op(r[7].result, ==, DNS_ERR_NODATA);
tt_int_op(r[7].ttl, ==, 0);
end:
if (dns)
evdns_base_free(dns, 0);
regress_clean_dnsserver();
}
static void
dns_search_empty_test(void *arg)
{
struct basic_test_data *data = arg;
struct event_base *base = data->base;
struct evdns_base *dns = NULL;
dns = evdns_base_new(base, 0);
evdns_base_search_add(dns, "whatever.example.com");
n_replies_left = 1;
exit_base = base;
tt_ptr_op(evdns_base_resolve_ipv4(dns, "", 0, generic_dns_callback, NULL), ==, NULL);
end:
if (dns)
evdns_base_free(dns, 0);
}
static void dns_search_test(void *arg) { dns_search_test_impl(arg, 0); }
static void dns_search_lower_test(void *arg) { dns_search_test_impl(arg, 1); }
static int request_count = 0;
static struct evdns_request *current_req = NULL;
static void
search_cancel_server_cb(struct evdns_server_request *req, void *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;
TT_BLATHER(("got question, %s", question));
tt_assert(request_count > 0);
tt_assert(!evdns_server_request_respond(req, 3));
if (!--request_count)
evdns_cancel_request(NULL, current_req);
end:
;
}
static void
dns_search_cancel_test(void *arg)
{
struct basic_test_data *data = arg;
struct event_base *base = data->base;
struct evdns_base *dns = NULL;
struct evdns_server_port *port = NULL;
ev_uint16_t portnum = 0;
struct generic_dns_callback_result r1;
char buf[64];
port = regress_get_dnsserver(base, &portnum, NULL,
search_cancel_server_cb, NULL);
tt_assert(port);
evutil_snprintf(buf, sizeof(buf), "127.0.0.1:%d", (int)portnum);
dns = evdns_base_new(base, 0);
tt_assert(!evdns_base_nameserver_ip_add(dns, buf));
evdns_base_search_add(dns, "a.example.com");
evdns_base_search_add(dns, "b.example.com");
evdns_base_search_add(dns, "c.example.com");
evdns_base_search_add(dns, "d.example.com");
exit_base = base;
request_count = 3;
n_replies_left = 1;
current_req = evdns_base_resolve_ipv4(dns, "host", 0,
generic_dns_callback, &r1);
event_base_dispatch(base);
tt_int_op(r1.result, ==, DNS_ERR_CANCEL);
end:
if (port)
evdns_close_server_port(port);
if (dns)
evdns_base_free(dns, 0);
}
static void
fail_server_cb(struct evdns_server_request *req, void *data)
{
const char *question;
int *count = data;
struct in_addr in;
/* Drop the first N requests that we get. */
if (*count > 0) {
--*count;
tt_want(! evdns_server_request_drop(req));
return;
}
if (req->nquestions != 1)
TT_DIE(("Only handling one question at a time; got %d",
req->nquestions));
question = req->questions[0]->name;
if (!evutil_ascii_strcasecmp(question, "google.com")) {
/* Detect a probe, and get out of the loop. */
event_base_loopexit(exit_base, NULL);
}
tt_assert(evutil_inet_pton(AF_INET, "16.32.64.128", &in));
evdns_server_request_add_a_reply(req, question, 1, &in.s_addr,
100);
tt_assert(! evdns_server_request_respond(req, 0))
return;
end:
tt_want(! evdns_server_request_drop(req));
}
static void
dns_retry_test_impl(void *arg, int flags)
{
struct basic_test_data *data = arg;
struct event_base *base = data->base;
struct evdns_server_port *port = NULL;
struct evdns_base *dns = NULL;
int drop_count = 2;
ev_uint16_t portnum = 0;
char buf[64];
struct generic_dns_callback_result r1;
port = regress_get_dnsserver(base, &portnum, NULL,
fail_server_cb, &drop_count);
tt_assert(port);
evutil_snprintf(buf, sizeof(buf), "127.0.0.1:%d", (int)portnum);
dns = evdns_base_new(base, flags);
tt_assert(!evdns_base_nameserver_ip_add(dns, buf));
tt_assert(! evdns_base_set_option(dns, "timeout", "0.2"));
tt_assert(! evdns_base_set_option(dns, "max-timeouts:", "10"));
tt_assert(! evdns_base_set_option(dns, "initial-probe-timeout", "0.1"));
evdns_base_resolve_ipv4(dns, "host.example.com", 0,
generic_dns_callback, &r1);
n_replies_left = 1;
exit_base = base;
event_base_dispatch(base);
tt_int_op(drop_count, ==, 0);
tt_int_op(r1.type, ==, DNS_IPv4_A);
tt_int_op(r1.count, ==, 1);
tt_int_op(((ev_uint32_t*)r1.addrs)[0], ==, htonl(0x10204080));
/* Now try again, but this time have the server get treated as
* failed, so we can send it a test probe. */
drop_count = 4;
tt_assert(! evdns_base_set_option(dns, "max-timeouts:", "2"));
tt_assert(! evdns_base_set_option(dns, "attempts:", "3"));
memset(&r1, 0, sizeof(r1));
evdns_base_resolve_ipv4(dns, "host.example.com", 0,
generic_dns_callback, &r1);
n_replies_left = 2;
/* This will run until it answers the "google.com" probe request. */
event_base_dispatch(base);
/* We'll treat the server as failed here. */
tt_int_op(r1.result, ==, DNS_ERR_TIMEOUT);
/* It should work this time. */
tt_int_op(drop_count, ==, 0);
evdns_base_resolve_ipv4(dns, "host.example.com", 0,
generic_dns_callback, &r1);
event_base_dispatch(base);
tt_int_op(r1.result, ==, DNS_ERR_NONE);
tt_int_op(r1.type, ==, DNS_IPv4_A);
tt_int_op(r1.count, ==, 1);
tt_int_op(((ev_uint32_t*)r1.addrs)[0], ==, htonl(0x10204080));
end:
if (dns)
evdns_base_free(dns, 0);
if (port)
evdns_close_server_port(port);
}
static void
dns_retry_test(void *arg)
{
dns_retry_test_impl(arg, 0);
}
static void
dns_retry_disable_when_inactive_test(void *arg)
{
dns_retry_test_impl(arg, EVDNS_BASE_DISABLE_WHEN_INACTIVE);
}
static struct regress_dns_server_table internal_error_table[] = {
/* Error 4 (NOTIMPL) makes us reissue the request to another server
if we can.
XXXX we should reissue under a much wider set of circumstances!
*/
{ "foof.example.com", "err", "4", 0, 0 },
{ NULL, NULL, NULL, 0, 0 }
};
static struct regress_dns_server_table reissue_table[] = {
{ "foof.example.com", "A", "240.15.240.15", 0, 0 },
{ NULL, NULL, NULL, 0, 0 }
};
static void
dns_reissue_test_impl(void *arg, int flags)
{
struct basic_test_data *data = arg;
struct event_base *base = data->base;
struct evdns_server_port *port1 = NULL, *port2 = NULL;
struct evdns_base *dns = NULL;
struct generic_dns_callback_result r1;
ev_uint16_t portnum1 = 0, portnum2=0;
char buf1[64], buf2[64];
port1 = regress_get_dnsserver(base, &portnum1, NULL,
regress_dns_server_cb, internal_error_table);
tt_assert(port1);
port2 = regress_get_dnsserver(base, &portnum2, NULL,
regress_dns_server_cb, reissue_table);
tt_assert(port2);
evutil_snprintf(buf1, sizeof(buf1), "127.0.0.1:%d", (int)portnum1);
evutil_snprintf(buf2, sizeof(buf2), "127.0.0.1:%d", (int)portnum2);
dns = evdns_base_new(base, flags);
tt_assert(!evdns_base_nameserver_ip_add(dns, buf1));
tt_assert(! evdns_base_set_option(dns, "timeout:", "0.3"));
tt_assert(! evdns_base_set_option(dns, "max-timeouts:", "2"));
tt_assert(! evdns_base_set_option(dns, "attempts:", "5"));
memset(&r1, 0, sizeof(r1));
evdns_base_resolve_ipv4(dns, "foof.example.com", 0,
generic_dns_callback, &r1);
/* Add this after, so that we are sure to get a reissue. */
tt_assert(!evdns_base_nameserver_ip_add(dns, buf2));
n_replies_left = 1;
exit_base = base;
event_base_dispatch(base);
tt_int_op(r1.result, ==, DNS_ERR_NONE);
tt_int_op(r1.type, ==, DNS_IPv4_A);
tt_int_op(r1.count, ==, 1);
tt_int_op(((ev_uint32_t*)r1.addrs)[0], ==, htonl(0xf00ff00f));
/* Make sure we dropped at least once. */
tt_int_op(internal_error_table[0].seen, >, 0);
end:
if (dns)
evdns_base_free(dns, 0);
if (port1)
evdns_close_server_port(port1);
if (port2)
evdns_close_server_port(port2);
}
static void
dns_reissue_test(void *arg)
{
dns_reissue_test_impl(arg, 0);
}
static void
dns_reissue_disable_when_inactive_test(void *arg)
{
dns_reissue_test_impl(arg, EVDNS_BASE_DISABLE_WHEN_INACTIVE);
}
#if 0
static void
dumb_bytes_fn(char *p, size_t n)
{
unsigned i;
/* This gets us 6 bits of entropy per transaction ID, which means we
* will have probably have collisions and need to pick again. */
for (i=0;i<n;++i)
p[i] = (char)(rand() & 7);
}
#endif
static void
dns_inflight_test_impl(void *arg, int flags)
{
struct basic_test_data *data = arg;
struct event_base *base = data->base;
struct evdns_base *dns = NULL;
struct evdns_server_port *dns_port = NULL;
ev_uint16_t portnum = 0;
char buf[64];
int disable_when_inactive = flags & EVDNS_BASE_DISABLE_WHEN_INACTIVE;
struct generic_dns_callback_result r[20];
int i;
dns_port = regress_get_dnsserver(base, &portnum, NULL,
regress_dns_server_cb, reissue_table);
tt_assert(dns_port);
if (disable_when_inactive) {
exit_port = dns_port;
}
evutil_snprintf(buf, sizeof(buf), "127.0.0.1:%d", (int)portnum);
dns = evdns_base_new(base, flags);
tt_assert(!evdns_base_nameserver_ip_add(dns, buf));
tt_assert(! evdns_base_set_option(dns, "max-inflight:", "3"));
tt_assert(! evdns_base_set_option(dns, "randomize-case:", "0"));
for (i=0;i<20;++i)
evdns_base_resolve_ipv4(dns, "foof.example.com", 0, generic_dns_callback, &r[i]);
n_replies_left = 20;
exit_base = base;
event_base_dispatch(base);
for (i=0;i<20;++i) {
tt_int_op(r[i].type, ==, DNS_IPv4_A);
tt_int_op(r[i].count, ==, 1);
tt_int_op(((ev_uint32_t*)r[i].addrs)[0], ==, htonl(0xf00ff00f));
}
end:
if (dns)
evdns_base_free(dns, 0);
if (exit_port) {
evdns_close_server_port(exit_port);
exit_port = NULL;
} else if (! disable_when_inactive) {
evdns_close_server_port(dns_port);
}
}
static void
dns_inflight_test(void *arg)
{
dns_inflight_test_impl(arg, 0);
}
static void
dns_disable_when_inactive_test(void *arg)
{
dns_inflight_test_impl(arg, EVDNS_BASE_DISABLE_WHEN_INACTIVE);
}
static void
dns_disable_when_inactive_no_ns_test(void *arg)
{
struct basic_test_data *data = arg;
struct event_base *base = data->base, *inactive_base;
struct evdns_base *dns = NULL;
ev_uint16_t portnum = 0;
char buf[64];
struct generic_dns_callback_result r;
inactive_base = event_base_new();
tt_assert(inactive_base);
/** Create dns server with inactive base, to avoid replying to clients */
tt_assert(regress_dnsserver(inactive_base, &portnum, search_table));
evutil_snprintf(buf, sizeof(buf), "127.0.0.1:%d", (int)portnum);
dns = evdns_base_new(base, EVDNS_BASE_DISABLE_WHEN_INACTIVE);
tt_assert(!evdns_base_nameserver_ip_add(dns, buf));
tt_assert(! evdns_base_set_option(dns, "timeout:", "0.1"));
evdns_base_resolve_ipv4(dns, "foof.example.com", 0, generic_dns_callback, &r);
n_replies_left = 1;
exit_base = base;
event_base_dispatch(base);
tt_int_op(n_replies_left, ==, 0);
tt_int_op(r.result, ==, DNS_ERR_TIMEOUT);
tt_int_op(r.count, ==, 0);
tt_ptr_op(r.addrs, ==, NULL);
end:
if (dns)