On Sun, 2008-11-16 at 17:48 +0200, elyasaf wrote:

Last week spoofing UDP work fine (before I try UDP patch - https://lists.balabit.hu/pipermail/tproxy/2008-November/000999.html) But now I get: " destination-sendto() error:Invalid argument" (I can achieve the source and destination IP for "UDP server") I use tproxy 4.1 kernel: 2.6.25

The code (that work fine before the above patch): int fd=socket(AF_INET, SOCK_DGRAM, 0); int flags=1; if (setsockopt(fd, SOL_IP, IP_TRANSPARENT, &flags, sizeof(int)) == -1){ perror("destination-setsockopt() IP_TRANSPARENT error!"); return; }else{ printf("destination-setsockopt IP_TRANSPARENT is OK...\n"); } setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof(flags)); setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &flags, sizeof(flags)); if(bind (fd, (struct sockaddr *) source,sizeof(*source))==-1){ perror("destination-bind() error!"); return; } flags=0; if(sendto(fd,buf,len,flags, (struct sockaddr *)destination, sizeof(*destination))==-1){ perror("destination-sendto() error"); return; } close(fd);

Any Advice?

I don't see how my patch could cause sendto() to fail. I didn't touch the sendto() code path. Can you post a strace dump of this code running? -- Bazsi