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#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <pcap/pcap.h>
FILE * outfile = NULL;
static int bufferToFile(const char * name, const uint8_t *Data, size_t Size) {
FILE * fd;
if (remove(name) != 0) {
if (errno != ENOENT) {
printf("failed remove, errno=%d\n", errno);
return -1;
}
}
fd = fopen(name, "wb");
if (fd == NULL) {
printf("failed open, errno=%d\n", errno);
return -2;
}
if (fwrite (Data, 1, Size, fd) != Size) {
fclose(fd);
return -3;
}
fclose(fd);
return 0;
}
void fuzz_openFile(const char * name) {
if (outfile != NULL) {
fclose(outfile);
}
outfile = fopen(name, "w");
}
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
pcap_t * pkts;
char errbuf[PCAP_ERRBUF_SIZE];
const u_char *pkt;
struct pcap_pkthdr *header;
struct pcap_stat stats;
int r;
//initialize output file
if (outfile == NULL) {
outfile = fopen("/dev/null", "w");
if (outfile == NULL) {
return 0;
}
}
//rewrite buffer to a file as libpcap does not have buffer inputs
if (bufferToFile("/tmp/fuzz.pcap", Data, Size) < 0) {
return 0;
}
//initialize structure
pkts = pcap_open_offline("/tmp/fuzz.pcap", errbuf);
if (pkts == NULL) {
fprintf(outfile, "Couldn't open pcap file %s\n", errbuf);
return 0;
}
//loop over packets
r = pcap_next_ex(pkts, &header, &pkt);
while (r > 0) {
//TODO pcap_offline_filter
fprintf(outfile, "packet length=%d/%d\n",header->caplen, header->len);
r = pcap_next_ex(pkts, &header, &pkt);
}
if (pcap_stats(pkts, &stats) == 0) {
fprintf(outfile, "number of packets=%d\n", stats.ps_recv);
}
//close structure
pcap_close(pkts);
return 0;
}
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