Hello, I have created raw socket as below
rawSockfd = socket(AF_INET,SOCK_RAW,IPPROTO_IP)
Added flag 5 sec SO_RCVTIMEO, IP_HDRINCL to 1 via setsockopt.
Sending IP Packet as below:
struct sockaddr_in connection = getSockAddr(dstIPAddress);
long bytes = sendto(rawSockfd, (uint8_t *)packet, size, 0, (struct sockaddr *)&connection, sizeof(struct sockaddr));
I am trying to receive as below:
long rsize = recvfrom(rawSock, buffer, size, 0, (struct sockaddr *)&connection, (socklen_t *)&addrlen);
This works fine for ICMP, UDP. recvfrom able to read packet back.
We are facing issue during TCP. recvfrom returns error: Resource temporarily unavailable after 5 sec timeout. If we remove timeout flag SO_RCVTIMEO then it gets stuck forever.
TCPdump shows following logs on destination. Instead of SYN ACK it's getting Reset:
09:21:03.972632 IP 10.215.179.1.54745 > 10.207.134.154.8181: Flags [SEW], seq 358899317, win 65535, options [mss 1380,nop,wscale 6,nop,nop,TS val 426499980 ecr 0,sackOK,eol], length 0
09:21:03.972755 IP 10.207.134.154.8181 > 10.215.179.1.54745: Flags [R.], seq 0, ack 358899318, win 0, length 0
is this something macOS not sending TCP response back to rawsocket or something is wrong in my code?