111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
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/*************************************************************************
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> File Name : demo2.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 20:31:49 2021
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************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <pcap.h>
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#define SNAP_LEN 65536
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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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int send_pkt_pcap(const u_char *pkt, int len)
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{
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static pcap_t *handle = NULL;
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char dev_str[64];
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char err_buf[PCAP_ERRBUF_SIZE];
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strcpy(dev_str, "eth1");
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if(NULL == handle)
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{
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handle = pcap_open_live(dev_str, SNAP_LEN, 1, 1000, err_buf);
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if (handle == NULL)
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{
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fprintf(stderr, "Couldn't open device %s: %s\n", dev_str, err_buf);
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return 0;
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}
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}
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return pcap_sendpacket(handle, pkt, len);
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}
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void 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 ret : %d", send_pkt_pcap((const u_char *)pkt_send, sizeof(pkt_send)));
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}
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int main(int argc, char *argv[])
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{
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char *dev, errbuf[PCAP_ERRBUF_SIZE];
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struct bpf_program fp; /* The compiled filter expression */
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char filter_exp[] = "vlan and src host 192.168.1.123"; /* The filter expression (filter 53 port)*/
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pcap_t *handle;
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bpf_u_int32 mask; /* The netmask of our sniffing device */
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bpf_u_int32 net; /* The IP of our sniffing device */
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dev = pcap_lookupdev(errbuf);
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if (dev == NULL) {
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fprintf(stderr, "Couldn't find default device: %s\n", errbuf);
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return(2);
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}
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printf("Device: %s\n", dev);
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/*get network mask*/
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if (pcap_lookupnet(dev, &net, &mask, errbuf) == -1) {
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fprintf(stderr, "Can't get netmask for device %s\n", dev);
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net = 0;
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mask = 0;
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}
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/*Open the session in promiscuous mode*/
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handle = pcap_open_live(dev, BUFSIZ, 1, 1000, errbuf);
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if (handle == NULL) {
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fprintf(stderr, "Couldn't open device %s: %s\n", dev, errbuf);
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return(2);
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}
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/* Compile and apply the filter */
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if (pcap_compile(handle, &fp, filter_exp, 0, net) == -1) {
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fprintf(stderr, "Couldn't parse filter %s: %s\n", filter_exp, pcap_geterr(handle));
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return(2);
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}
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if (pcap_setfilter(handle, &fp) == -1) {
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fprintf(stderr, "Couldn't install filter %s: %s\n", filter_exp, pcap_geterr(handle));
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return(2);
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}
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pcap_loop(handle, -1, dispatcher_handler, NULL);
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/* cleanup */
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pcap_freecode(&fp);
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pcap_close(handle);
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dPrint("Capture complete.");
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return(0);
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}
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