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update code, tested

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This commit is contained in:
Nick Peng
2018-05-30 21:21:45 +08:00
parent 75ebf7ce49
commit 1da0b172d3
5 changed files with 59 additions and 50 deletions
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73
dns_server.c
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@@ -17,13 +17,13 @@
*/
#include "dns_server.h"
#include "dns.h"
#include "util.h"
#include "atomic.h"
#include "tlog.h"
#include "dns.h"
#include "dns_client.h"
#include "hashtable.h"
#include "list.h"
#include "dns_client.h"
#include "tlog.h"
#include "util.h"
#include <arpa/inet.h>
#include <errno.h>
#include <linux/filter.h>
@@ -59,6 +59,7 @@ struct dns_request {
struct hlist_node map;
char domain[DNS_MAX_CNAME_LEN];
char alias[DNS_MAX_CNAME_LEN];
struct dns_head head;
unsigned short qtype;
unsigned short id;
unsigned short ss_family;
@@ -69,10 +70,8 @@ struct dns_request {
struct sockaddr addr;
};
union {
unsigned char ipv4_addr[DNS_RR_A_LEN];
unsigned char ipv6_addr[DNS_RR_AAAA_LEN];
};
unsigned char ipv4_addr[DNS_RR_A_LEN];
unsigned char ipv6_addr[DNS_RR_AAAA_LEN];
};
static struct dns_server server;
@@ -174,7 +173,6 @@ static int _dns_add_rrs(struct dns_packet *packet, struct dns_request *request)
return ret;
}
static int _dns_reply(struct dns_request *request)
{
unsigned char inpacket[DNS_IN_PACKSIZE];
@@ -189,8 +187,10 @@ static int _dns_reply(struct dns_request *request)
head.id = request->id;
head.qr = DNS_QR_ANSWER;
head.opcode = DNS_OP_QUERY;
head.rd = 1;
head.rd = 0;
head.ra = 0;
head.aa = 0;
head.tc = 0;
head.rcode = DNS_RC_NOERROR;
ret = dns_packet_init(packet, DNS_PACKSIZE, &head);
if (ret != 0) {
@@ -214,13 +214,12 @@ static int _dns_reply(struct dns_request *request)
send_len = sendto(server.fd, inpacket, encode_len, 0, &request->addr, request->addr_len);
if (send_len != encode_len) {
printf("send failed.");
tlog(TLOG_ERROR, "send failed.");
}
return 0;
}
static int dns_server_resolve_callback(char *domain, struct dns_result *result, void *user_ptr)
{
struct dns_request *request = user_ptr;
@@ -241,24 +240,24 @@ static int dns_server_resolve_callback(char *domain, struct dns_result *result,
memcpy(request->ipv4_addr, result->addr_ipv4, 4);
strncpy(request->alias, result->alias, DNS_MAX_CNAME_LEN);
// memcpy(request->ipv6_addr, result->addr_ipv6, 16);
request->qtype = DNS_T_A;
memcpy(request->ipv6_addr, result->addr_ipv6, 16);
tlog(TLOG_INFO, "result: %s, %d.%d.%d.%d\n", domain,
request->ipv4_addr[0],
request->ipv4_addr[1],
request->ipv4_addr[2],
request->ipv4_addr[3]);
if (request->qtype == DNS_T_A) {
tlog(TLOG_INFO, "result: %s, %d.%d.%d.%d\n", domain, request->ipv4_addr[0], request->ipv4_addr[1], request->ipv4_addr[2], request->ipv4_addr[3]);
} else if (request->qtype == DNS_T_AAAA) {
tlog(TLOG_INFO, "result :%s, %x%x:%x%x:%x%x:%x%x:%x%x:%x%x:%x%x:%x%x", domain, request->ipv6_addr[0], request->ipv6_addr[1], request->ipv6_addr[2],
request->ipv6_addr[3], request->ipv6_addr[4], request->ipv6_addr[5], request->ipv6_addr[6], request->ipv6_addr[7], request->ipv6_addr[8],
request->ipv6_addr[9], request->ipv6_addr[10], request->ipv6_addr[11], request->ipv6_addr[12], request->ipv6_addr[13], request->ipv6_addr[14],
request->ipv6_addr[15]);
}
_dns_reply(request);
memset(request, 0, sizeof(*request));
free(request);
return 0;
}
static int _dns_server_recv(unsigned char *inpacket, int inpacket_len, struct sockaddr_storage *from, socklen_t from_len)
{
int decode_len;
@@ -294,6 +293,7 @@ static int _dns_server_recv(unsigned char *inpacket, int inpacket_len, struct so
}
request->id = packet->head.id;
memcpy(&request->head, &packet->head, sizeof(struct dns_head));
rrs = dns_get_rrs_start(packet, DNS_RRS_QD, &rr_count);
if (rr_count > 1) {
@@ -315,13 +315,17 @@ static int _dns_server_recv(unsigned char *inpacket, int inpacket_len, struct so
free(request);
return ret;
break;
case DNS_T_A:
break;
default:
tlog(TLOG_INFO, "unsupport qtype: %d, domain: %s", qtype, request->domain);
return ret;
break;
}
tlog(TLOG_INFO, "query server %s from %s\n", request->domain, gethost_by_addr(name, (struct sockaddr *)from, from_len));
tlog(TLOG_INFO, "query server %s from %s, qtype = %d\n", request->domain, gethost_by_addr(name, (struct sockaddr *)from, from_len), qtype);
atomic_set(&request->refcnt, 1);
dns_client_query(request->domain, dns_server_resolve_callback, request);
dns_client_query(request->domain, qtype, dns_server_resolve_callback, request);
return 0;
errout:
@@ -358,19 +362,18 @@ int dns_server_run(void)
int sleep_time = 0;
unsigned long expect_time = 0;
now = get_tick_count() - sleep;
expect_time = now + sleep;
while (server.run) {
now = get_tick_count();
if (now - expect_time >= 0) {
_dns_server_period_run();
sleep_time = sleep - (now - expect_time);
now = get_tick_count() - sleep;
expect_time = now + sleep;
while (server.run) {
now = get_tick_count();
if (now - expect_time >= 0) {
_dns_server_period_run();
sleep_time = sleep - (now - expect_time);
if (sleep_time < 0) {
sleep_time = 0;
}
expect_time += sleep;
}
expect_time += sleep;
}
num = epoll_wait(server.epoll_fd, events, DNS_MAX_EVENTS, sleep_time);
if (num < 0) {
@@ -388,7 +391,9 @@ int dns_server_run(void)
continue;
}
_dns_server_process(now);
if (_dns_server_process(now) != 0) {
tlog(TLOG_ERROR, "dns server process failed.");
}
}
}