生成pcap文件

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#include <stdlib.h>
#include <stdio.h>
#include <sys/unistd.h>
#include <pcap/pcap.h>
 
typedef struct pcap_log_t pcap_log_t;
struct pcap_log_t {
    pcap_t* pd;
    pcap_dumper_t* pdumper;
};
 
pcap_log_t* pcap_log_init()
{
	char path[256];
	pcap_log_t* pcap = (pcap_log_t*)malloc(sizeof(*pcap));
	memset(pcap, 0, sizeof(*pcap));
 
	pcap->pd = pcap_open_dead(/* DLT_RAW */ 1, 65535 /* snaplen */);
 
	sprintf(path, "/tmp/pcap_%d.pcap", gettid());
	pcap->pdumper = pcap_dump_open(pcap->pd, path);
	return pcap;
}
 
void pcap_log_write(pcap_log_t* pcap, char* packet, int len)
{
	struct pcap_pkthdr hdr;
	hdr.ts.tv_sec = 0;
	hdr.ts.tv_usec = 0;
	hdr.caplen = len;
	hdr.len = len;
 
	pcap_dump((u_char*)pcap->pdumper, &hdr, (const u_char*)packet);
	pcap_dump_flush(pcap->pdumper);
}
 
void pcap_log_fini(pcap_log_t* pcap)
{
	pcap_dump_close(pcap->pdumper);
	pcap_close(pcap->pd);
 
	free(pcap);
}
 
int main()
{
	pcap_log_t* pcap = pcap_log_init();
/*	while (...) {
		// packet is raw data from mac layer 
		pcap_log_write(pcap, packet, len);
	}
*/	pcap_log_fini(pcap);
	return 0;
}

refer to:
https://blog.csdn.net/u014260236/article/details/51035484/