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This commit is contained in:
Nick Peng
2018-05-16 00:56:43 +08:00
parent 66f804a109
commit 924745da04
6 changed files with 1110 additions and 818 deletions
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230
dns.c
View File

@@ -1,8 +1,34 @@
/*************************************************************************
*
* Copyright (C) 2018 Ruilin Peng (Nick) <pymumu@gmail.com>.
*
* smartdns is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* smartdns is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dns.h" #include "dns.h"
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
#define DNS_MAX_CNAME_LEN 128 #define QR_MASK 0x8000
#define OPCODE_MASK 0x7800
#define AA_MASK 0x0400
#define TC_MASK 0x0200
#define RD_MASK 0x0100
#define RA_MASK 0x8000
#define RCODE_MASK 0x000F
#define DNS_RR_END (0XFFFF)
short dns_read_short(unsigned char **buffer) short dns_read_short(unsigned char **buffer)
{ {
@@ -51,7 +77,7 @@ unsigned int dns_read_int(unsigned char **buffer)
return ntohs(value); return ntohs(value);
} }
struct dns_rrs *dns_get_rrs_start(struct dns_packet *packet, int type, int *count) struct dns_rrs *dns_get_rrs_start(struct dns_packet *packet, dns_rr_type type, int *count)
{ {
unsigned short start; unsigned short start;
struct dns_head *head = &packet->head; struct dns_head *head = &packet->head;
@@ -152,11 +178,10 @@ int dns_rr_add_end(struct dns_packet *packet, int type, dns_type_t rrtype, int l
*start = packet->len; *start = packet->len;
} }
rrs->next = DNS_RR_END;//*start; rrs->next = DNS_RR_END; //*start;
*count += 1; *count += 1;
rrs->len = len; rrs->len = len;
rrs->type = rrtype; rrs->type = rrtype;
//*start = packet->len;
packet->len += len + sizeof(*rrs); packet->len += len + sizeof(*rrs);
return 0; return 0;
} }
@@ -268,7 +293,7 @@ int _dns_get_rr_head(struct dns_data_context *data_context, char *domain, int ma
return len; return len;
} }
int dns_add_CNAME(struct dns_packet *packet, char *domain, int ttl, char *cname) int dns_add_CNAME(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, char *cname)
{ {
int maxlen = 0; int maxlen = 0;
int len = 0; int len = 0;
@@ -298,7 +323,7 @@ int dns_add_CNAME(struct dns_packet *packet, char *domain, int ttl, char *cname)
data_context.ptr += rr_len; data_context.ptr += rr_len;
len = data_context.ptr - data_context.data; len = data_context.ptr - data_context.data;
return dns_rr_add_end(packet, DNS_RRS_AN, DNS_T_CNAME, len); return dns_rr_add_end(packet, type, DNS_T_CNAME, len);
} }
int dns_get_CNAME(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, char *cname, int cname_size) int dns_get_CNAME(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, char *cname, int cname_size)
@@ -333,7 +358,7 @@ int dns_get_CNAME(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, char
return 0; return 0;
} }
int dns_add_A(struct dns_packet *packet, char *domain, int ttl, unsigned char addr[4]) int dns_add_A(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, unsigned char addr[4])
{ {
int maxlen = 0; int maxlen = 0;
int len = 0; int len = 0;
@@ -357,7 +382,17 @@ int dns_add_A(struct dns_packet *packet, char *domain, int ttl, unsigned char ad
data_context.ptr += DNS_RR_A_LEN; data_context.ptr += DNS_RR_A_LEN;
len = data_context.ptr - data_context.data; len = data_context.ptr - data_context.data;
return dns_rr_add_end(packet, DNS_RRS_AN, DNS_T_A, len); return dns_rr_add_end(packet, type, DNS_T_A, len);
}
int dns_add_PTR(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, char *cname)
{
return dns_add_CNAME(packet, type, domain, ttl, cname);
}
int dns_get_PTR(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, char *cname, int cname_size)
{
return dns_get_CNAME(rrs, domain, maxsize, ttl, cname, cname_size);
} }
int dns_get_A(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, unsigned char addr[4]) int dns_get_A(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, unsigned char addr[4])
@@ -392,7 +427,7 @@ int dns_get_A(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, unsigned
return 0; return 0;
} }
int dns_add_AAAA(struct dns_packet *packet, char *domain, int ttl, unsigned char addr[16]) int dns_add_AAAA(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, unsigned char addr[16])
{ {
int maxlen = 0; int maxlen = 0;
int len = 0; int len = 0;
@@ -416,7 +451,7 @@ int dns_add_AAAA(struct dns_packet *packet, char *domain, int ttl, unsigned char
data_context.ptr += DNS_RR_AAAA_LEN; data_context.ptr += DNS_RR_AAAA_LEN;
len = data_context.ptr - data_context.data; len = data_context.ptr - data_context.data;
return dns_rr_add_end(packet, DNS_RRS_AN, DNS_T_AAAA, len); return dns_rr_add_end(packet, type, DNS_T_AAAA, len);
} }
int dns_get_AAAA(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, unsigned char addr[16]) int dns_get_AAAA(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, unsigned char addr[16])
@@ -566,7 +601,7 @@ int _dns_decode_domain(struct dns_context *context, char *output, int size)
while (1) { while (1) {
len = *ptr; len = *ptr;
if (len == 0) { if (len == 0) {
*output = 0; *(output - 1) = 0;
ptr++; ptr++;
break; break;
} }
@@ -801,12 +836,60 @@ int _dns_encode_A(struct dns_context *context, struct dns_rrs *rrs)
return -1; return -1;
} }
memcpy(context->ptr, rrs->data, DNS_RR_A_LEN); memcpy(context->ptr, data_context.ptr, DNS_RR_A_LEN);
context->ptr += DNS_RR_A_LEN; context->ptr += DNS_RR_A_LEN;
return 0; return 0;
} }
int _dns_decode_PTR(struct dns_context *context, char *name, int name_size)
{
int ret;
ret = _dns_decode_domain(context, name, name_size);
return ret;
}
int _dns_encode_PTR(struct dns_context *context, struct dns_rrs *rrs)
{
int ret;
int qtype = 0;
int qclass = 0;
int ttl = 0;
char domain[DNS_MAX_CNAME_LEN];
int rr_len;
struct dns_data_context data_context;
data_context.data = rrs->data;
data_context.ptr = rrs->data;
data_context.maxsize = rrs->len;
ret = _dns_get_rr_head(&data_context, domain, DNS_MAX_CNAME_LEN, &qtype, &qclass, &ttl, &rr_len);
if (ret < 0) {
return -1;
}
if (rr_len >= data_context.maxsize) {
return -1;
}
ret = _dns_encode_rr_head(context, domain, qtype, qclass, ttl, rr_len);
if (ret < 0) {
return -1;
}
if (_dns_left_len(context) < rr_len) {
return -1;
}
ret = _dns_encode_domain(context, (char *)data_context.ptr);
if (ret < 0) {
return -1;
}
return 0;
}
int _dns_decode_AAAA(struct dns_context *context, unsigned char addr[DNS_RR_AAAA_LEN]) int _dns_decode_AAAA(struct dns_context *context, unsigned char addr[DNS_RR_AAAA_LEN])
{ {
if (_dns_left_len(context) < DNS_RR_AAAA_LEN) { if (_dns_left_len(context) < DNS_RR_AAAA_LEN) {
@@ -850,12 +933,61 @@ int _dns_encode_AAAA(struct dns_context *context, struct dns_rrs *rrs)
return -1; return -1;
} }
memcpy(context->ptr, rrs->data, DNS_RR_AAAA_LEN); memcpy(context->ptr, context->ptr, DNS_RR_AAAA_LEN);
context->ptr += DNS_RR_AAAA_LEN; context->ptr += DNS_RR_AAAA_LEN;
return 0; return 0;
} }
int _dns_decode_NS(struct dns_context *context, unsigned char addr[4])
{
if (_dns_left_len(context) < DNS_RR_A_LEN) {
return -1;
}
memcpy(addr, context->ptr, DNS_RR_A_LEN);
context->ptr += DNS_RR_A_LEN;
return 0;
}
int _dns_encode_NS(struct dns_context *context, struct dns_rrs *rrs)
{
int ret;
int qtype = 0;
int qclass = 0;
int ttl = 0;
char domain[DNS_MAX_CNAME_LEN];
int rr_len;
struct dns_data_context data_context;
data_context.data = rrs->data;
data_context.ptr = rrs->data;
data_context.maxsize = rrs->len;
ret = _dns_get_rr_head(&data_context, domain, DNS_MAX_CNAME_LEN, &qtype, &qclass, &ttl, &rr_len);
if (ret < 0) {
return -1;
}
if (rr_len != DNS_RR_A_LEN) {
return -1;
}
ret = _dns_encode_rr_head(context, domain, qtype, qclass, ttl, DNS_RR_A_LEN);
if (ret < 0) {
return -1;
}
if (_dns_left_len(context) < DNS_RR_A_LEN) {
return -1;
}
memcpy(context->ptr, rrs->data, DNS_RR_A_LEN);
context->ptr += DNS_RR_A_LEN;
return 0;
}
int _dns_decode_qd(struct dns_context *context) int _dns_decode_qd(struct dns_context *context)
{ {
struct dns_packet *packet = context->packet; struct dns_packet *packet = context->packet;
@@ -877,7 +1009,7 @@ int _dns_decode_qd(struct dns_context *context)
return 0; return 0;
} }
int _dns_decode_an(struct dns_context *context) int _dns_decode_an(struct dns_context *context, dns_rr_type type)
{ {
int ret; int ret;
int qtype = 0; int qtype = 0;
@@ -886,25 +1018,15 @@ int _dns_decode_an(struct dns_context *context)
int rr_len = 0; int rr_len = 0;
char domain[DNS_MAX_CNAME_LEN]; char domain[DNS_MAX_CNAME_LEN];
struct dns_packet *packet = context->packet; struct dns_packet *packet = context->packet;
unsigned char *start;
ret = _dns_decode_rr_head(context, domain, DNS_MAX_CNAME_LEN, &qtype, &qclass, &ttl, &rr_len); ret = _dns_decode_rr_head(context, domain, DNS_MAX_CNAME_LEN, &qtype, &qclass, &ttl, &rr_len);
if (ret < 0) { if (ret < 0) {
return -1; return -1;
} }
start = context->ptr;
switch (qtype) { switch (qtype) {
case DNS_T_CNAME: {
char cname[DNS_MAX_CNAME_LEN];
ret = _dns_decode_CNAME(context, cname, DNS_MAX_CNAME_LEN);
if (ret < 0) {
return -1;
}
ret = dns_add_CNAME(packet, domain, ttl, cname);
if (ret < 0) {
return -1;
}
} break;
case DNS_T_A: { case DNS_T_A: {
unsigned char addr[DNS_RR_A_LEN]; unsigned char addr[DNS_RR_A_LEN];
ret = _dns_decode_A(context, addr); ret = _dns_decode_A(context, addr);
@@ -912,7 +1034,31 @@ int _dns_decode_an(struct dns_context *context)
return -1; return -1;
} }
ret = dns_add_A(packet, domain, ttl, addr); ret = dns_add_A(packet, type, domain, ttl, addr);
if (ret < 0) {
return -1;
}
} break;
case DNS_T_CNAME: {
char cname[DNS_MAX_CNAME_LEN];
ret = _dns_decode_CNAME(context, cname, DNS_MAX_CNAME_LEN);
if (ret < 0) {
return -1;
}
ret = dns_add_CNAME(packet, type, domain, ttl, cname);
if (ret < 0) {
return -1;
}
} break;
case DNS_T_PTR: {
char name[DNS_MAX_CNAME_LEN];
ret = _dns_decode_PTR(context, name, DNS_MAX_CNAME_LEN);
if (ret < 0) {
return -1;
}
ret = dns_add_PTR(packet, type, domain, ttl, name);
if (ret < 0) { if (ret < 0) {
return -1; return -1;
} }
@@ -924,7 +1070,7 @@ int _dns_decode_an(struct dns_context *context)
return -1; return -1;
} }
ret = dns_add_AAAA(packet, domain, ttl, addr); ret = dns_add_AAAA(packet, type, domain, ttl, addr);
if (ret < 0) { if (ret < 0) {
return -1; return -1;
} }
@@ -934,6 +1080,10 @@ int _dns_decode_an(struct dns_context *context)
break; break;
} }
if (context->ptr - start != rr_len) {
return -1;
}
return 0; return 0;
} }
@@ -972,6 +1122,12 @@ int _dns_encode_an(struct dns_context *context, struct dns_rrs *rrs)
return -1; return -1;
} }
} break; } break;
case DNS_T_PTR:
ret = _dns_encode_PTR(context, rrs);
if (ret < 0) {
return -1;
}
break;
case DNS_T_AAAA: case DNS_T_AAAA:
ret = _dns_encode_AAAA(context, rrs); ret = _dns_encode_AAAA(context, rrs);
if (ret < 0) { if (ret < 0) {
@@ -1001,13 +1157,29 @@ int _dns_decode_body(struct dns_context *context)
} }
for (i = 0; i < head->ancount; i++) { for (i = 0; i < head->ancount; i++) {
ret = _dns_decode_an(context); ret = _dns_decode_an(context, DNS_RRS_AN);
if (ret < 0) { if (ret < 0) {
return -1; return -1;
} }
head->ancount--; head->ancount--;
} }
for (i = 0; i < head->nscount; i++) {
ret = _dns_decode_an(context, DNS_RRS_NS);
if (ret < 0) {
return -1;
}
head->nscount--;
}
for (i = 0; i < head->nrcount; i++) {
ret = _dns_decode_an(context, DNS_RRS_NR);
if (ret < 0) {
return -1;
}
head->nrcount--;
}
return 0; return 0;
} }

61
dns.h
View File

@@ -6,23 +6,17 @@
#include <netdb.h> #include <netdb.h>
#include <stdint.h> #include <stdint.h>
#define QR_MASK 0x8000
#define OPCODE_MASK 0x7800
#define AA_MASK 0x0400
#define TC_MASK 0x0200
#define RD_MASK 0x0100
#define RA_MASK 0x8000
#define RCODE_MASK 0x000F
#define DNS_RR_A_LEN 4 #define DNS_RR_A_LEN 4
#define DNS_RR_AAAA_LEN 16 #define DNS_RR_AAAA_LEN 16
#define DNS_MAX_CNAME_LEN 128
#define DNS_RRS_QD 0 typedef enum dns_rr_type {
#define DNS_RRS_AN 1 DNS_RRS_QD = 0,
#define DNS_RRS_NS 2 DNS_RRS_AN = 1,
#define DNS_RRS_NR 3 DNS_RRS_NS = 2,
DNS_RRS_NR = 3,
#define DNS_RR_END (0XFFFF) DNS_RRS_END = 4,
} dns_rr_type;
typedef enum dns_class { DNS_C_IN = 1, DNS_C_ANY = 255 } dns_class_t; typedef enum dns_class { DNS_C_IN = 1, DNS_C_ANY = 255 } dns_class_t;
@@ -100,8 +94,7 @@ struct dns_packet {
unsigned char data[0]; unsigned char data[0];
}; };
struct dns_data_context struct dns_data_context {
{
unsigned char *data; unsigned char *data;
unsigned char *ptr; unsigned char *ptr;
unsigned int maxsize; unsigned int maxsize;
@@ -116,23 +109,33 @@ struct dns_context {
struct dns_rrs *dns_get_rrs_next(struct dns_packet *packet, struct dns_rrs *rrs); struct dns_rrs *dns_get_rrs_next(struct dns_packet *packet, struct dns_rrs *rrs);
struct dns_rrs *dns_get_rrs_start(struct dns_packet *packet, int type, int *count); struct dns_rrs *dns_get_rrs_start(struct dns_packet *packet, dns_rr_type type, int *count);
int dns_add_CNAME(struct dns_packet *packet, char *domain, int ttl, char *cname); /*
* Question
int dns_get_CNAME(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, char *cname, int cname_size); */
int dns_add_domain(struct dns_packet *packet, char *domain, int qtype, int qclass);
int dns_add_A(struct dns_packet *packet, char *domain, int ttl, unsigned char addr[4]);
int dns_get_A(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, unsigned char addr[4]);
int dns_add_AAAA(struct dns_packet *packet, char *domain, int ttl, unsigned char addr[16]);
int dns_get_AAAA(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, unsigned char addr[16]);
int dns_get_domain(struct dns_rrs *rrs, char *domain, int maxsize, int *qtype, int *qclass); int dns_get_domain(struct dns_rrs *rrs, char *domain, int maxsize, int *qtype, int *qclass);
int dns_add_domain(struct dns_packet *packet, char *domain, int qtype, int qclass); /*
* Answers
*/
int dns_add_CNAME(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, char *cname);
int dns_get_CNAME(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, char *cname, int cname_size);
int dns_add_A(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, unsigned char addr[4]);
int dns_get_A(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, unsigned char addr[4]);
int dns_add_PTR(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, char *cname);
int dns_get_PTR(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, char *cname, int cname_size);
int dns_add_AAAA(struct dns_packet *packet, dns_rr_type type, char *domain, int ttl, unsigned char addr[16]);
int dns_get_AAAA(struct dns_rrs *rrs, char *domain, int maxsize, int *ttl, unsigned char addr[16]);
int dns_decode(struct dns_packet *packet, int maxsize, unsigned char *data, int size); int dns_decode(struct dns_packet *packet, int maxsize, unsigned char *data, int size);

18
dns_client.c
View File

@@ -1,3 +1,21 @@
/*************************************************************************
*
* Copyright (C) 2018 Ruilin Peng (Nick) <pymumu@gmail.com>.
*
* smartdns is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* smartdns is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dns_client.h" #include "dns_client.h"
#include "atomic.h" #include "atomic.h"
#include "fast_ping.h" #include "fast_ping.h"

75
dns_server.c
View File

@@ -1,3 +1,21 @@
/*************************************************************************
*
* Copyright (C) 2018 Ruilin Peng (Nick) <pymumu@gmail.com>.
*
* smartdns is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* smartdns is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dns_server.h" #include "dns_server.h"
#include "dns.h" #include "dns.h"
#include "hashtable.h" #include "hashtable.h"
@@ -46,7 +64,6 @@ static void tv_sub(struct timeval *out, struct timeval *in)
void _dns_server_period_run() void _dns_server_period_run()
{ {
unsigned char packet_data[DNS_INPACKET_SIZE]; unsigned char packet_data[DNS_INPACKET_SIZE];
unsigned char data[DNS_INPACKET_SIZE]; unsigned char data[DNS_INPACKET_SIZE];
@@ -56,6 +73,7 @@ void _dns_server_period_run()
memset(&head, 0, sizeof(head)); memset(&head, 0, sizeof(head));
head.rcode = 0; head.rcode = 0;
head.qr = 0; head.qr = 0;
head.rd = 1;
head.ra = 0; head.ra = 0;
head.id = 1; head.id = 1;
@@ -82,7 +100,12 @@ static int _dns_server_process(struct timeval *now)
int len; int len;
unsigned char inpacket[DNS_INPACKET_SIZE]; unsigned char inpacket[DNS_INPACKET_SIZE];
unsigned char rsppacket[DNS_INPACKET_SIZE]; unsigned char rsppacket[DNS_INPACKET_SIZE];
unsigned char aswpacket[DNS_INPACKET_SIZE];
unsigned char outpacket[DNS_INPACKET_SIZE];
struct dns_packet *packet = (struct dns_packet *)rsppacket; struct dns_packet *packet = (struct dns_packet *)rsppacket;
struct dns_packet *anspacket = (struct dns_packet *)aswpacket;
struct sockaddr_storage from; struct sockaddr_storage from;
socklen_t from_len = sizeof(from); socklen_t from_len = sizeof(from);
int data_len; int data_len;
@@ -105,27 +128,65 @@ static int _dns_server_process(struct timeval *now)
struct dns_rrs *rrs; struct dns_rrs *rrs;
char name[128]; char name[128];
int i = 0; int i = 0;
int j = 0;
int ttl; int ttl;
int qtype; int qtype;
int qclass; int qclass;
printf("qdcount = %d, ancount = %d, nscount = %d, nrcount = %d, len = %d\n", struct dns_head head;
packet->head.qdcount, packet->head.ancount, packet->head.nscount, memset(&head, 0, sizeof(head));
head.rcode = 0;
head.qr = 1;
head.rd = 1;
head.ra = 0;
head.id = packet->head.id;
int n = 0;
dns_packet_init(anspacket, DNS_INPACKET_SIZE, &head);
printf("qdcount = %d, ancount = %d, nscount = %d, nrcount = %d, len = %d\n", packet->head.qdcount, packet->head.ancount, packet->head.nscount,
packet->head.nrcount, data_len); packet->head.nrcount, data_len);
rrs = dns_get_rrs_start(packet, DNS_RRS_QD, &count); rrs = dns_get_rrs_start(packet, DNS_RRS_QD, &count);
for (i = 0; i < count && rrs; i++, rrs = dns_get_rrs_next(packet, rrs)) { for (i = 0; i < count && rrs; i++, rrs = dns_get_rrs_next(packet, rrs)) {
switch (rrs->type) {
case DNS_T_CNAME: {
dns_get_domain(rrs, name, 128, &qtype, &qclass); dns_get_domain(rrs, name, 128, &qtype, &qclass);
printf("domain: %s qtype: %d qclass: %d\n", name, qtype, qclass); printf("domain: %s qtype: %d qclass: %d\n", name, qtype, qclass);
switch (qtype) {
case DNS_T_A: {
unsigned char addr[4];
addr[0] = 192;
addr[1] = 188;
addr[2] = 9;
addr[3] = 8;
dns_add_A(anspacket, DNS_RRS_AN, name, 60 * 60, addr);
n++;
} break;
case DNS_T_AAAA: {
unsigned char addr[16];
addr[0] = 192;
addr[1] = 188;
addr[2] = 9;
addr[3] = 8;
dns_add_AAAA(anspacket, DNS_RRS_AN, name, 60 * 60, addr);
n++;
} break;
case DNS_T_PTR:{
dns_add_PTR(anspacket, DNS_RRS_AN, name, 60 * 60, "raspberrypi.larva-family.com");
n++;
} break; } break;
default: default:
break; break;
} }
} }
rrs = dns_get_rrs_start(packet, DNS_RRS_AN, &count); if (n > 0 && packet->head.qr == 0) {
dns_add_CNAME(anspacket, DNS_RRS_AN, name, 60 * 60, name);
len = dns_encode(outpacket, DNS_INPACKET_SIZE, anspacket);
sendto(server.fd, outpacket, len, 0, (struct sockaddr *)&from, from_len);
}
for (j = 1; j < DNS_RRS_END; j++) {
rrs = dns_get_rrs_start(packet, j, &count);
for (i = 0; i < count && rrs; i++, rrs = dns_get_rrs_next(packet, rrs)) { for (i = 0; i < count && rrs; i++, rrs = dns_get_rrs_next(packet, rrs)) {
switch (rrs->type) { switch (rrs->type) {
case DNS_T_A: { case DNS_T_A: {
@@ -133,6 +194,7 @@ static int _dns_server_process(struct timeval *now)
dns_get_A(rrs, name, 128, &ttl, addr); dns_get_A(rrs, name, 128, &ttl, addr);
printf("%s %d : %d.%d.%d.%d\n", name, ttl, addr[0], addr[1], addr[2], addr[3]); printf("%s %d : %d.%d.%d.%d\n", name, ttl, addr[0], addr[1], addr[2], addr[3]);
} break; } break;
case DNS_T_NS:
case DNS_T_CNAME: { case DNS_T_CNAME: {
char cname[128]; char cname[128];
dns_get_CNAME(rrs, name, 128, &ttl, cname, 128); dns_get_CNAME(rrs, name, 128, &ttl, cname, 128);
@@ -142,6 +204,7 @@ static int _dns_server_process(struct timeval *now)
break; break;
} }
} }
}
printf("\n"); printf("\n");
return 0; return 0;

18
fast_ping.c
View File

@@ -1,3 +1,21 @@
/*************************************************************************
*
* Copyright (C) 2018 Ruilin Peng (Nick) <pymumu@gmail.com>.
*
* smartdns is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* smartdns is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "fast_ping.h" #include "fast_ping.h"
#include "atomic.h" #include "atomic.h"
#include "hashtable.h" #include "hashtable.h"

18
smartdns.c
View File

@@ -1,3 +1,21 @@
/*************************************************************************
*
* Copyright (C) 2018 Ruilin Peng (Nick) <pymumu@gmail.com>.
*
* smartdns is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* smartdns is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "fast_ping.h" #include "fast_ping.h"
#include "dns_client.h" #include "dns_client.h"
#include "dns_server.h" #include "dns_server.h"