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dns_server: fix issue of incorrect caching results when enable ip white list.

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This commit is contained in:
Nick Peng
2023-11-14 22:55:39 +08:00
parent d54d7cf80a
commit eb0d0336de
2 changed files with 58 additions and 11 deletions
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27
src/dns_server.c
View File

@@ -3214,6 +3214,7 @@ static int _dns_server_process_answer(struct dns_request *request, const char *d
int j = 0;
struct dns_rrs *rrs = NULL;
int ret = 0;
int is_skip = 0;
if (packet->head.rcode != DNS_RC_NOERROR && packet->head.rcode != DNS_RC_NXDOMAIN) {
if (request->rcode == DNS_RC_SERVFAIL) {
@@ -3225,11 +3226,6 @@ static int _dns_server_process_answer(struct dns_request *request, const char *d
return -1;
}
request->remote_server_fail = 0;
if (request->rcode == DNS_RC_SERVFAIL) {
request->rcode = packet->head.rcode;
}
for (j = 1; j < DNS_RRS_OPT; j++) {
rrs = dns_get_rrs_start(packet, j, &rr_count);
for (i = 0; i < rr_count && rrs; i++, rrs = dns_get_rrs_next(packet, rrs)) {
@@ -3239,6 +3235,7 @@ static int _dns_server_process_answer(struct dns_request *request, const char *d
if (ret == -1) {
break;
} else if (ret == -2) {
is_skip = 1;
continue;
} else if (ret == -3) {
return -1;
@@ -3250,6 +3247,7 @@ static int _dns_server_process_answer(struct dns_request *request, const char *d
if (ret == -1) {
break;
} else if (ret == -2) {
is_skip = 1;
continue;
} else if (ret == -3) {
return -1;
@@ -3304,6 +3302,11 @@ static int _dns_server_process_answer(struct dns_request *request, const char *d
}
}
request->remote_server_fail = 0;
if (request->rcode == DNS_RC_SERVFAIL && is_skip == 0) {
request->rcode = packet->head.rcode;
}
return 0;
}
@@ -3329,11 +3332,6 @@ static int _dns_server_passthrough_rule_check(struct dns_request *request, const
return 0;
}
request->remote_server_fail = 0;
if (request->rcode == DNS_RC_SERVFAIL) {
request->rcode = packet->head.rcode;
}
for (j = 1; j < DNS_RRS_OPT; j++) {
rrs = dns_get_rrs_start(packet, j, &rr_count);
for (i = 0; i < rr_count && rrs; i++, rrs = dns_get_rrs_next(packet, rrs)) {
@@ -3438,6 +3436,11 @@ static int _dns_server_passthrough_rule_check(struct dns_request *request, const
}
}
request->remote_server_fail = 0;
if (request->rcode == DNS_RC_SERVFAIL) {
request->rcode = packet->head.rcode;
}
*pttl = ttl;
return -1;
}
@@ -7063,6 +7066,8 @@ static int _dns_create_socket(const char *host_ip, int type)
tlog(TLOG_ERROR, "set socket opt failed.");
goto errout;
}
/* enable TCP_FASTOPEN */
setsockopt(fd, SOL_TCP, TCP_FASTOPEN, &optval, sizeof(optval));
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes));
} else {
setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &optval, sizeof(optval));
@@ -7261,7 +7266,7 @@ static int _dns_server_socket_tls(struct dns_bind_ip *bind_ip, DNS_CONN_TYPE con
}
SSL_CTX_set_session_cache_mode(ssl_ctx,
SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_INTERNAL | SSL_SESS_CACHE_NO_AUTO_CLEAR);
SSL_SESS_CACHE_BOTH | SSL_SESS_CACHE_NO_INTERNAL | SSL_SESS_CACHE_NO_AUTO_CLEAR);
SSL_CTX_set_default_passwd_cb(ssl_ctx, _dns_server_socket_tls_ssl_pass_callback);
SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, bind_ip);

42
test/cases/test-ip-rule.cc
View File

@@ -73,6 +73,48 @@ cache-persist no)""");
EXPECT_EQ(client.GetAnswer()[0].GetData(), "4.5.6.7");
}
TEST_F(IPRule, white_list_not_in)
{
smartdns::MockServer server_upstream;
smartdns::MockServer server_upstream2;
smartdns::Server server;
server_upstream.Start("udp://0.0.0.0:61053", [](struct smartdns::ServerRequestContext *request) {
if (request->qtype != DNS_T_A) {
return smartdns::SERVER_REQUEST_SOA;
}
smartdns::MockServer::AddIP(request, request->domain.c_str(), "1.2.3.4", 611);
return smartdns::SERVER_REQUEST_OK;
});
server_upstream2.Start("udp://0.0.0.0:62053", [](struct smartdns::ServerRequestContext *request) {
if (request->qtype != DNS_T_A) {
return smartdns::SERVER_REQUEST_SOA;
}
smartdns::MockServer::AddIP(request, request->domain.c_str(), "9.10.11.12", 611);
return smartdns::SERVER_REQUEST_OK;
});
/* this ip will be discard, but is reachable */
server.MockPing(PING_TYPE_ICMP, "1.2.3.4", 60, 10);
server.Start(R"""(bind [::]:60053
server udp://127.0.0.1:61053 -whitelist-ip
server udp://127.0.0.1:62053 -whitelist-ip
whitelist-ip 4.5.6.7/24
log-num 0
log-console yes
log-level debug
cache-persist no)""");
smartdns::Client client;
ASSERT_TRUE(client.Query("a.com", 60053));
std::cout << client.GetResult() << std::endl;
ASSERT_EQ(client.GetAnswerNum(), 0);
EXPECT_EQ(client.GetStatus(), "SERVFAIL");
}
TEST_F(IPRule, black_list)
{
smartdns::MockServer server_upstream;