My goal is making a TCP/IP connection in a sender <-> server -> receiver fashion.
I have a server, sender and receiver. The server initial part looks like:
int main(int argc, char *argv[]){
int welcomeSocket, senderSocket;
char buffer[1024];
struct sockaddr_in serverAddr;
struct sockaddr_storage serverStorage;
socklen_t addr_size;
if (2 != argc) {
fprintf(stderr, "Usage: %s <port>\n", argv[0]);
exit(1);
}
/*---- Create the socket. The three arguments are: ----*/
/* 1) Internet domain 2) Stream socket 3) Default protocol (TCP in this case) */
welcomeSocket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
/*---- Configure settings of the server address struct ----*/
/* Address family = Internet */
serverAddr.sin_family = AF_INET;
/* Set port number, using htons function to use proper byte order */
serverAddr.sin_port = htons(atoi(argv[1]));
/* Set IP address to localhost */
serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
//int len=20;
//char sbuffer[len];
//inet_ntop(AF_INET, &(serverAddr.sin_addr), sbuffer, len);
//printf("address:%s\n",sbuffer);
/* Set all bits of the padding field to 0 */
memset(serverAddr.sin_zero, '\0', sizeof serverAddr.sin_zero);
/*---- Bind the address struct to the socket ----*/
bind(welcomeSocket, (struct sockaddr *) &serverAddr, sizeof(serverAddr));
/*---- Listen on the socket, with 5 max connection requests queued ----*/
if(listen(welcomeSocket,5)==0)
printf("Listening\n");
else
printf("Error\n");
/*---- Accept call creates a new socket for the incoming connection ----*/
addr_size = sizeof serverStorage;
senderSocket = accept(welcomeSocket, (struct sockaddr *) &serverStorage, &addr_size);
//~~~~Some more code~~~
}
however this sets up the server ip address as 0.0.0.0
. I have no clue whether this is correct or not, but all until now I had manually set up the ip address as 127.0.1.1 which is what I get when I type hostname -i
in the terminal.
So, currently I am having my sender connect to the same IP address, but since I am working all files in the same computer I don't know if it will work across other computers in the network with this weird ip address 0.0.0.0
. Can someone clarify (and maybe help fix) this small issue to me? I have tried reading other solutions that try to explain the difference between 0.0.0.0
and 127.0.0.1
but I couldn't find anything related to the performance on the connection/communication between server and sender in a TCP/IP connection.
And then the IPv4 address is listed as 129.15.78.12
in my system settings, but then again, not sure which one should be used for the server
or receiver
.