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mmmdbybyd 2017-07-12 12:52:46 +08:00 committed by GitHub
parent 705cabbd8c
commit 3a7d93668a
4 changed files with 47 additions and 47 deletions
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12
dns.c
View File

@ -1,7 +1,7 @@
#include "dns.h" #include "dns.h"
#include "http.h" #include "http.h"
struct dns dns_list[MAX_CONNECTION / 2]; //一个客户端 + 一个服务端 占用一个dns结构体 struct dns dns_list[MAX_CONNECTION / 2]; //一个客户端 + 一个服务端 占用一个dns结构体
int dnsFd; int dnsFd;
void read_dns_rsp() void read_dns_rsp()
@ -17,10 +17,10 @@ void read_dns_rsp()
memcpy(&dns_flag, rsp_data, 2); memcpy(&dns_flag, rsp_data, 2);
dns = dns_list + dns_flag; dns = dns_list + dns_flag;
client = cts + (dns_flag << 1); client = cts + (dns_flag << 1);
//判断是否是正常DNS回应，是否已关闭连接 //判断是否是正常DNS回应，是否已关闭连接
if (dns_flag > MAX_CONNECTION >> 1 || client->fd < 0) if (dns_flag > MAX_CONNECTION >> 1 || client->fd < 0)
continue; continue;
if (dns->request_len + 12 > len || (unsigned char)rsp_data[3] != 128) //char只有7位可用，则正数最高为127 if (dns->request_len + 12 > len || (unsigned char)rsp_data[3] != 128) //char只有7位可用，则正数最高为127
{ {
close_connection(client); close_connection(client);
continue; continue;
@ -58,7 +58,7 @@ void read_dns_rsp()
} }
} }
/* 完全发送返回0，发送部分返回1，出错返回-1 */ /* 完全发送返回0，发送部分返回1，出错返回-1 */
static int8_t send_dns_req(struct dns *dns) static int8_t send_dns_req(struct dns *dns)
{ {
static int write_len; static int write_len;
@ -145,12 +145,12 @@ int8_t build_dns_req(struct dns *dns, char *domain)
void dns_connect(struct sockaddr_in *dnsAddr) void dns_connect(struct sockaddr_in *dnsAddr)
{ {
dnsFd = socket(AF_INET, SOCK_DGRAM, 0); dnsFd = socket(AF_INET, SOCK_DGRAM, 0);
if (dnsFd < 0) if (dnsFd < 0)
{ {
perror("socket"); perror("socket");
exit(1); exit(1);
} }
connect(dnsFd, (struct sockaddr *)dnsAddr, sizeof(struct sockaddr_in)); connect(dnsFd, (struct sockaddr *)dnsAddr, sizeof(struct sockaddr_in));
fcntl(dnsFd, F_SETFL, O_NONBLOCK); fcntl(dnsFd, F_SETFL, O_NONBLOCK);
} }

2
dns.h
View File

@ -4,7 +4,7 @@
#include "main.h" #include "main.h"
struct dns { struct dns {
char request[512]; //UDP的DNS请求不超512字节 char request[512]; //UDP的DNS请求不超512字节
uint16_t request_len, sent_len; uint16_t request_len, sent_len;
}; };

46
http.c
View File

@ -226,10 +226,10 @@ static char *build_request(char *client_data, int *data_len, char *host)
static char *uri, *url, *p, *lf, *header, *new_data, *proxy_host; static char *uri, *url, *p, *lf, *header, *new_data, *proxy_host;
static int len; static int len;
del_hdr(client_data, data_len);
header = client_data; header = client_data;
proxy_host = host; proxy_host = host;
do { do {
del_hdr(client_data, data_len);
/* 将完整url转换为uri */ /* 将完整url转换为uri */
url = strchr(header, ' '); url = strchr(header, ' ');
lf = strchr(header, '\n'); lf = strchr(header, '\n');
@ -435,7 +435,7 @@ void tcp_in(conn_t *in)
if (in->fd < 0) if (in->fd < 0)
return; return;
//如果in - cts是奇数，那么是服务端触发事件 //如果in - cts是奇数，那么是服务端触发事件
if ((in - cts) & 1) if ((in - cts) & 1)
{ {
if (in->ready_data_len == 0) if (in->ready_data_len == 0)
@ -537,28 +537,28 @@ void *accept_loop(void *ptr)
{ {
conn_t *client; conn_t *client;
while (1) while (1)
{ {
/* 偶数为客户端，奇数为服务端 */ /* 偶数为客户端，奇数为服务端 */
for (client = cts; client - cts < MAX_CONNECTION; client += 2) for (client = cts; client - cts < MAX_CONNECTION; client += 2)
if (client->fd < 0) if (client->fd < 0)
break; break;
if (client - cts >= MAX_CONNECTION) if (client - cts >= MAX_CONNECTION)
{ {
sleep(3); sleep(3);
continue; continue;
} }
client->fd = accept(lisFd, (struct sockaddr *)&addr, &addr_len); client->fd = accept(lisFd, (struct sockaddr *)&addr, &addr_len);
if (client->fd >= 0) if (client->fd >= 0)
{ {
fcntl(client->fd, F_SETFL, fcntl(client->fd, F_GETFL)|O_NONBLOCK); fcntl(client->fd, F_SETFL, fcntl(client->fd, F_GETFL)|O_NONBLOCK);
ev.data.ptr = client; ev.data.ptr = client;
ev.events = EPOLLIN|EPOLLET; ev.events = EPOLLIN|EPOLLET;
epoll_ctl(efd, EPOLL_CTL_ADD, client->fd, &ev); epoll_ctl(efd, EPOLL_CTL_ADD, client->fd, &ev);
} }
} }
return NULL; return NULL;
} }
void create_listen(char *ip, int port) void create_listen(char *ip, int port)

32
main.c
View File

@ -27,11 +27,11 @@ static void usage()
static void server_loop() static void server_loop()
{ {
pthread_t thread_id; pthread_t thread_id;
int n; int n;
//单独进程accept多进程并发环境下不会惊群 //单独进程accept多进程并发环境下不会惊群
pthread_create(&thread_id, NULL, accept_loop, NULL); pthread_create(&thread_id, NULL, accept_loop, NULL);
ev.events = EPOLLIN; ev.events = EPOLLIN;
ev.data.fd = dnsFd; ev.data.fd = dnsFd;
epoll_ctl(efd, EPOLL_CTL_ADD, dnsFd, &ev); epoll_ctl(efd, EPOLL_CTL_ADD, dnsFd, &ev);
@ -39,7 +39,7 @@ static void server_loop()
{ {
n = epoll_wait(efd, evs, MAX_CONNECTION + 2, -1); n = epoll_wait(efd, evs, MAX_CONNECTION + 2, -1);
while (n-- > 0) while (n-- > 0)
{ {
if (evs[n].data.fd == dnsFd) if (evs[n].data.fd == dnsFd)
{ {
if (evs[n].events & EPOLLIN) if (evs[n].events & EPOLLIN)
@ -60,7 +60,7 @@ static void server_loop()
static void initializate(int argc, char **argv) static void initializate(int argc, char **argv)
{ {
struct sockaddr_in dnsAddr; struct sockaddr_in dnsAddr;
char *p; char *p;
int opt, i, workers = 1; int opt, i, workers = 1;
@ -73,22 +73,22 @@ static void initializate(int argc, char **argv)
exit(1); exit(1);
} }
dnsAddr.sin_family = addr.sin_family = AF_INET; dnsAddr.sin_family = addr.sin_family = AF_INET;
//默认dns地址 //默认dns地址
dnsAddr.sin_addr.s_addr = inet_addr(DEFAULT_DNS_IP); dnsAddr.sin_addr.s_addr = inet_addr(DEFAULT_DNS_IP);
dnsAddr.sin_port = htons(53); dnsAddr.sin_port = htons(53);
dns_connect(&dnsAddr); //主进程中的fd dns_connect(&dnsAddr); //主进程中的fd
strict_spilce = 0; strict_spilce = 0;
local_header = NULL; local_header = NULL;
ssl_proxy = (char *)"CONNECT"; ssl_proxy = (char *)"CONNECT";
local_header = (char *)"\nLocal:"; local_header = (char *)"\nLocal:";
proxy_header = (char *)"\nHost:"; proxy_header = (char *)"\nHost:";
proxy_header_len = strlen(proxy_header); proxy_header_len = strlen(proxy_header);
local_header_len = strlen(local_header); local_header_len = strlen(local_header);
/* 读取命令行参数 */ /* 读取命令行参数 */
while ((opt = getopt(argc, argv, "d:l:p:s:w:L:ah")) != -1) while ((opt = getopt(argc, argv, "d:l:p:s:w:L:ah")) != -1)
{ {
switch (opt) switch (opt)
{ {
case 'd': case 'd':
p = strchr(optarg, ':'); p = strchr(optarg, ':');
if (p) if (p)
@ -101,7 +101,7 @@ static void initializate(int argc, char **argv)
dnsAddr.sin_port = htons(53); dnsAddr.sin_port = htons(53);
} }
dnsAddr.sin_addr.s_addr = inet_addr(optarg); dnsAddr.sin_addr.s_addr = inet_addr(optarg);
connect(dnsFd, (struct sockaddr *)&dnsAddr, sizeof(dnsAddr)); connect(dnsFd, (struct sockaddr *)&dnsAddr, sizeof(dnsAddr));
break; break;
case 'l': case 'l':
@ -118,7 +118,7 @@ static void initializate(int argc, char **argv)
break; break;
case 'p': case 'p':
//假如选项值为 "Proxy", proxy_header设置为 "\nProxy:" //假如选项值为 "Proxy", proxy_header设置为 "\nProxy:"
proxy_header_len = strlen(optarg) + 2; proxy_header_len = strlen(optarg) + 2;
if (optarg[proxy_header_len] == ':') if (optarg[proxy_header_len] == ':')
optarg[proxy_header_len--] = '\0'; optarg[proxy_header_len--] = '\0';
@ -169,7 +169,7 @@ static void initializate(int argc, char **argv)
memset(cts, 0, sizeof(cts)); memset(cts, 0, sizeof(cts));
for (i = MAX_CONNECTION; i--; ) for (i = MAX_CONNECTION; i--; )
cts[i].fd = -1; cts[i].fd = -1;
//为服务端的结构体分配内存 //为服务端的结构体分配内存
for (i = 1; i < MAX_CONNECTION; i += 2) for (i = 1; i < MAX_CONNECTION; i += 2)
{ {
cts[i].ready_data = (char *)malloc(BUFFER_SIZE); cts[i].ready_data = (char *)malloc(BUFFER_SIZE);
@ -195,9 +195,9 @@ static void initializate(int argc, char **argv)
dns_list[i].request[11] = 0; dns_list[i].request[11] = 0;
} }
signal(SIGPIPE, SIG_IGN); signal(SIGPIPE, SIG_IGN);
while (workers-- > 1 && fork() == 0) while (workers-- > 1 && fork() == 0)
//子进程中的dnsFd必须重新申请，不然epoll监听可能读取到其他进程得到的数据 //子进程中的dnsFd必须重新申请，不然epoll监听可能读取到其他进程得到的数据
dns_connect(&dnsAddr); dns_connect(&dnsAddr);
} }
int main(int argc, char **argv) int main(int argc, char **argv)