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