Raw tcp send and recv - tcp

Question

I'm making an application, using raw sockets and need your advice:
The application is a tester of some kind of tcp/ip stack.
What I need I have an application that connects with a remote server and transmits some data to id.
lets say - I cannot open sockets from my application - all I have is tcp/Ip buffer with all headers and so on.
For testing I wanna make 2 raw sockets - 1 for sending and 1 for receiving ip buffers.
for receiving i have this code:
int saddr_size , data_size;
struct sockaddr saddr;
unsigned char *buffer = (unsigned char *)malloc(65536); //Its Big!
printf("Starting...\n");
//Create a raw socket that shall sniff
sock_raw = socket(AF_INET , SOCK_RAW , IPPROTO_TCP);
if(sock_raw < 0)
{
printf("Socket Error\n");
return 1;
}
while(1)
{
saddr_size = sizeof saddr;
//Receive a packet
data_size = recvfrom(sock_raw , buffer , 65536 , 0 , &saddr , &saddr_size);
if(data_size <0 )
{
printf("Recvfrom error , failed to get packets\n");
return 1;
}
printf("Data size = %d", data_size);
}
close(sock_raw);
printf("Finished");
return 0;
And as I can see it works - it gets all TCP/IP packets.
For sender I tryed this
static const unsigned char pkt6[60] = {
0x32, 0x04, 0x34, 0xed, 0xf3, 0xab, 0x01, 0x02, /* 2.4..... */
0x03, 0x04, 0x05, 0x06, 0x08, 0x00, 0x45, 0x00, /* ......E. */
0x00, 0x2e, 0x00, 0x02, 0x00, 0x00, 0xff, 0x06, /* ........ */
0x44, 0xc5, 0xc0, 0xa8, 0x01, 0x02, 0xac, 0x11, /* D....... */
0x09, 0x47, 0x00, 0x08, 0x1a, 0x0b, 0x00, 0x00, /* .G...... */
0x19, 0x6e, 0x23, 0x17, 0xc8, 0x36, 0x50, 0x18, /* .n#..6P. */
0x08, 0x60, 0x2b, 0xb9, 0x00, 0x00, 0x6c, 0x6f, /* .`+...lo */
0x6f, 0x6c, 0x0a, 0x00 /* ol.. */
};
if((s = socket(AF_INET, SOCK_RAW, IPPROTO_TCP)) < 0) {
perror("error:");
exit(EXIT_FAILURE);
}
while(1) {
if(send(s, pkt6, sizeof(pkt6), 0)< 0)
perror("error::");
}
}
And it always says
error:: Destination address required
So what do I need to change if i want to send READy IP packets and get raw ip packets?

Answer 1

I've not use raw sockets this way myself, but AIUI you'll probably need to use sendto() instead of send(), and pass the saddr structure that you obtained in the recvfrom() call.