mirror of
https://github.com/zerotier/dumb.git
synced 2026-05-22 16:21:57 -07:00
Adam Ierymenko
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/* DUMB: Dumb User Mode Bridge */
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/* (c)2018 ZeroTier, Inc. */
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/* MIT license */
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#ifndef _BSD_SOURCE
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#define _BSD_SOURCE
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#endif
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <pthread.h>
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#include <pcap/pcap.h>
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static struct {
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pthread_t threads[2];
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pcap_t *interfaces[2];
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} ifs;
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static void ph(unsigned char *ifp,const struct pcap_pkthdr *hdr,const unsigned char *data)
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{
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unsigned int i = (unsigned int)((uintptr_t)ifp);
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if ((hdr)&&(data))
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pcap_inject(ifs.interfaces[i ^ 1],data,hdr->len);
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}
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static void *thr(void *ifp)
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{
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unsigned int i = (unsigned int)((uintptr_t)ifp);
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pcap_setdirection(ifs.interfaces[i],PCAP_D_IN);
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pcap_loop(ifs.interfaces[i],0,ph,(unsigned char *)ifp);
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return NULL;
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}
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int main(int argc,char **argv)
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{
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char errbuf[1024];
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if (argc != 3) {
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fprintf(stderr,"Usage: %s <interface0> <interface1>\n",argv[0]);
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return 1;
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}
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for(int i=0;i<2;++i) {
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ifs.interfaces[i] = pcap_open_live(argv[i + 1],131072,1,1,errbuf);
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if (!ifs.interfaces[i]) {
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fprintf(stderr,"%s: FATAL: unable to open device %s\n",argv[0],argv[1]);
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return 1;
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}
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if (pthread_create(&(ifs.threads[i]),NULL,thr,(void *)((uintptr_t)i))) {
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fprintf(stderr,"%s: FATAL: pthread_create() failed\n",argv[0]);
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return 1;
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}
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}
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for(int i=0;i<2;++i)
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pthread_join(ifs.threads[i],NULL);
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return 0;
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}
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