195 lines
6.7 KiB
C
195 lines
6.7 KiB
C
/*************************************************************************
|
||
> File Name : telnet_proxy.c
|
||
> Author : TL Song
|
||
> EMail : songtianlun@frytea.com
|
||
> Created Time : Thu Feb 18 18:57:20 2021
|
||
************************************************************************/
|
||
#include <stdio.h>
|
||
#include <string.h>
|
||
// #include <pthread.h>
|
||
#include <pcap.h>
|
||
|
||
#define RECV_SEND_DEVICE "eth1"
|
||
#define RETU_DEVICE "linux_dal"
|
||
#define RETU_SEND_DEVICE RECV_DEVICE
|
||
#define RECV_FILTER "src host 192.168.8.123 and arp or icmp or dst port 23"
|
||
#define RETU_FILTER ""
|
||
// switch, 1、定义后以多进程模式运行；2、定义后为抓到的包追加vlan标签。
|
||
// #define RUNNING_WITH_MULT_PROGRESS 0
|
||
// #define GREP_WITH_MAKE_VLAN 0
|
||
|
||
#define SNAP_LEN 65536
|
||
#ifndef GREP_WITH_MAKE_VLAN
|
||
#define RECV_DEVICE "eth0"
|
||
#else
|
||
#define RECV_DEVICE "eth0.3000"
|
||
#endif
|
||
|
||
static char g_vlan_tag[4] = {0x81, 0x00, 0x0B, 0xB8};
|
||
#define dPrint(fmt, ...) do{fprintf(stderr, "[%s:%d] " fmt "\r\n", __FUNCTION__, __LINE__, ##__VA_ARGS__);}while(0)
|
||
#define HexPrint(_buf, _len) \
|
||
{\
|
||
int _m_i = 0;\
|
||
char *_m_buf = (char *)(_buf);\
|
||
int _m_len = (int)(_len);\
|
||
printf("[%s:%d] \r\n", __FUNCTION__, __LINE__);\
|
||
printf("*****************************\n");\
|
||
for(_m_i = 0; _m_i < _m_len; _m_i++)\
|
||
{\
|
||
printf("\033[32m%02x \033[0m", _m_buf[_m_i] & 0xff);\
|
||
if(!((_m_i+1) % 10)) printf("\n");\
|
||
}\
|
||
printf("\nsize = %d\n*****************************\n", _m_len);\
|
||
}
|
||
|
||
char err_buf[PCAP_ERRBUF_SIZE];
|
||
struct bpf_program fp_recv; /* The compiled filter expression */
|
||
struct bpf_program fp_retu; /* The compiled filter expression */
|
||
char filter_recv[] = RECV_FILTER; /* The filter expression (filter 53 port)*/
|
||
char filter_retu[] = RETU_FILTER; /* The filter expression (filter 53 port)*/
|
||
pcap_t *handle_recv;
|
||
pcap_t *handle_retu;
|
||
pcap_t *handle_recv_send;
|
||
bpf_u_int32 mask_recv; /* The netmask of our sniffing device */
|
||
bpf_u_int32 mask_retu; /* The netmask of our sniffing device */
|
||
bpf_u_int32 net_recv; /* The IP of our sniffing device */
|
||
bpf_u_int32 net_retu; /* The IP of our sniffing device */
|
||
|
||
void recv_dispatcher_handler(u_char *temp1, const struct pcap_pkthdr *header, const u_char *pkt_data)
|
||
{
|
||
// HexPrint((const char *)pkt_data, header->caplen);
|
||
#ifndef GREP_WITH_MAKE_VLAN
|
||
u_char pkt_send[header->caplen];
|
||
memset(pkt_send, 0x00, sizeof(pkt_send));
|
||
memcpy(pkt_send, pkt_data, header->caplen);
|
||
#else
|
||
u_char pkt_send[header->caplen + sizeof(g_vlan_tag)];
|
||
memset(pkt_send, 0x00, sizeof(pkt_send));
|
||
memcpy(pkt_send, pkt_data, header->caplen);
|
||
memcpy(pkt_send+16, pkt_send+12, header->caplen-12);
|
||
memcpy(pkt_send+12, g_vlan_tag, sizeof(g_vlan_tag));
|
||
#endif
|
||
|
||
// HexPrint((const char *)pkt_send, sizeof(pkt_send));
|
||
dPrint("Send to %s ret : %d", RECV_SEND_DEVICE, pcap_sendpacket(handle_recv_send, pkt_send, sizeof(pkt_send)) );
|
||
}
|
||
|
||
void retu_dispatcher_handler(u_char *temp1, const struct pcap_pkthdr *header, const u_char *pkt_data)
|
||
{
|
||
// HexPrint((const char *)pkt_data, header->caplen);
|
||
u_char pkt_send[header->caplen];
|
||
memset(pkt_send, 0x00, sizeof(pkt_send));
|
||
memcpy(pkt_send, pkt_data, header->caplen);
|
||
// HexPrint((const char *)pkt_send, sizeof(pkt_send));
|
||
|
||
dPrint("Send to %s ret : %d", RECV_DEVICE, pcap_sendpacket(handle_recv, pkt_send, sizeof(pkt_send)) );
|
||
}
|
||
|
||
// 接收前面板 eth0 发来的消息，转发到 eth1
|
||
void *recv_handl(void *args)
|
||
{
|
||
struct pcap_pkthdr *header;
|
||
const u_char *pkt_data;
|
||
// pcap_loop(handle_recv, -1, recv_dispatcher_handler, NULL);
|
||
while(1)
|
||
{
|
||
if(0 <= pcap_next_ex(handle_recv, &header, &pkt_data))
|
||
dPrint("Send to %s ret : %d", RECV_SEND_DEVICE, pcap_sendpacket(handle_recv_send, pkt_data, header->caplen) );
|
||
}
|
||
|
||
dPrint("Capture complete.");
|
||
}
|
||
|
||
// 接收 linux_dal 发来的流量，转发到 eth0
|
||
void *retu_handl(void *args)
|
||
{
|
||
pcap_loop(handle_retu, -1, retu_dispatcher_handler, NULL);
|
||
dPrint("Capture complete.");
|
||
}
|
||
|
||
int main()
|
||
{
|
||
pthread_t tid_retu;
|
||
|
||
printf("Recv Device: %s\n", RECV_DEVICE);
|
||
printf("Retu Device: %s\n", RETU_DEVICE);
|
||
printf("Recv Send Device: %s\n", RECV_SEND_DEVICE);
|
||
printf("Retu Send Device: %s\n", RETU_SEND_DEVICE);
|
||
|
||
/*get network mask*/
|
||
if (pcap_lookupnet(RECV_DEVICE, &net_recv, &mask_recv, err_buf) == -1) {
|
||
fprintf(stderr, "Can't get netmask for device %s\n", RECV_DEVICE);
|
||
net_recv = 0;
|
||
mask_recv = 0;
|
||
}
|
||
if (pcap_lookupnet(RETU_DEVICE, &net_retu, &mask_retu, err_buf) == -1) {
|
||
fprintf(stderr, "Can't get netmask for device %s\n", RETU_DEVICE);
|
||
net_retu = 0;
|
||
mask_retu = 0;
|
||
}
|
||
/*Open the session in promiscuous mode*/
|
||
handle_recv = pcap_open_live(RECV_DEVICE, BUFSIZ, 1, 1000, err_buf);
|
||
if (handle_recv == NULL) {
|
||
fprintf(stderr, "Couldn't open device %s: %s\n", RECV_DEVICE, err_buf);
|
||
return;
|
||
}
|
||
handle_recv_send = pcap_open_live(RECV_SEND_DEVICE, SNAP_LEN, 1, 1000, err_buf);
|
||
if (handle_recv_send == NULL)
|
||
{
|
||
fprintf(stderr, "Couldn't open device %s: %s\n", RECV_SEND_DEVICE, err_buf);
|
||
return 0;
|
||
}
|
||
handle_retu = pcap_open_live(RETU_DEVICE, BUFSIZ, 1, 1000, err_buf);
|
||
if (handle_retu == NULL) {
|
||
fprintf(stderr, "Couldn't open device %s: %s\n", RETU_DEVICE, err_buf);
|
||
return;
|
||
}
|
||
/* Compile and apply the filter */
|
||
if (pcap_compile(handle_recv, &fp_recv, filter_recv, 0, net_recv) == -1) {
|
||
fprintf(stderr, "Couldn't parse filter %s: %s\n", filter_recv, pcap_geterr(handle_recv));
|
||
return;
|
||
}
|
||
if (pcap_compile(handle_retu, &fp_retu, filter_retu, 0, net_retu) == -1) {
|
||
fprintf(stderr, "Couldn't parse filter %s: %s\n", filter_retu, pcap_geterr(handle_retu));
|
||
return;
|
||
}
|
||
if (pcap_setfilter(handle_recv, &fp_recv) == -1) {
|
||
fprintf(stderr, "Couldn't install filter %s: %s\n", filter_recv, pcap_geterr(handle_recv));
|
||
return;
|
||
}
|
||
if (pcap_setfilter(handle_retu, &fp_retu) == -1) {
|
||
fprintf(stderr, "Couldn't install filter %s: %s\n", filter_retu, pcap_geterr(handle_retu));
|
||
return;
|
||
}
|
||
|
||
#ifndef RUNNING_WITH_MULT_PROGRESS
|
||
int ret = pthread_create(&tid_retu, NULL, retu_handl, NULL);
|
||
if (ret != 0) {
|
||
printf("pthread_create error: error_code = %d\n", ret);
|
||
}
|
||
recv_handl(NULL);
|
||
pthread_exit(NULL);
|
||
#else
|
||
pid_t fpid=fork();
|
||
if(fpid==0)
|
||
{
|
||
retu_handl(NULL);
|
||
printf("son/n");
|
||
}
|
||
else
|
||
{
|
||
recv_handl(NULL);
|
||
printf("father/n");
|
||
}
|
||
#endif
|
||
|
||
/* cleanup */
|
||
pcap_freecode(&fp_recv);
|
||
pcap_close(handle_recv);
|
||
pcap_freecode(&fp_retu);
|
||
pcap_close(handle_retu);
|
||
|
||
dPrint("Capture complete.");
|
||
return 0;
|
||
}
|