From 2a0c0a3dbbdf7fa5040953c0b0d88ad6f62c011e Mon Sep 17 00:00:00 2001 From: Joachim Tingvold Date: Sun, 6 Apr 2014 03:11:04 +0200 Subject: Initial commit. Source; TG13-goodiebag. --- mbd/derpspan.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 mbd/derpspan.c (limited to 'mbd/derpspan.c') diff --git a/mbd/derpspan.c b/mbd/derpspan.c new file mode 100644 index 0000000..b9fb362 --- /dev/null +++ b/mbd/derpspan.c @@ -0,0 +1,48 @@ +// gcc -O2 -o derspan derspan.c -lpcap -std=gnu99 -Wall + +#include +#include +#include +#include +#include + +int rawsock; + +void my_callback(u_char *user, const struct pcap_pkthdr *h, const u_char *bytes) +{ + int len = h->caplen; + if (len < 40) { + //printf("skipped short packet\n"); + return; + } + if (bytes[14] != 0x88 || bytes[15] != 0xbe) { + //printf("skipped non-ethernet packet\n"); + return; + } + if (bytes[36] != 0x08 || bytes[37] != 0x00) { + //printf("skipped non-IPv4 packet\n"); + return; + } + + struct sockaddr_in self; + self.sin_family = AF_INET; + self.sin_addr.s_addr = htonl(0x7f000001); // localhost + self.sin_port = htons(1337); + + sendto(rawsock, bytes + 38, len - 38, 0, (struct sockaddr *)&self, sizeof(self)); +} + +int main(int argc, char **argv) +{ + rawsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW); + if (rawsock == -1) { + perror("socket"); + exit(0); + } + + pcap_t *pcap = pcap_open_live(argv[1], 1500, 1, 1000, NULL); + pcap_activate(pcap); + pcap_loop(pcap, -1, my_callback, NULL); + return 0; +} + -- cgit v1.2.3