Invalid argument to connect() - c

Question

I'm trying to write code to setup a client socket that can send/receive messages from a server. Here's what I have:
// Create the socket
int s = socket(AF_INET, SOCK_STREAM, 0); // TODO: error checking
// Setup the client and server addresses
struct sockaddr_in cli_addr;
memset(&cli_addr, 0, sizeof(cli_addr));
cli_addr.sin_family = AF_INET;
cli_addr.sin_port = htons(7654);
cli_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
struct sockaddr_in serv_addr;
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(11111);
serv_addr.sin_addr.s_addr = inet_addr("XXX.XXX.XXX.XXX");
// Bind the socket to the client address (so we can receive messsages)
if (bind(s, (struct sockaddr*)&cli_addr, sizeof(cli_addr)) == -1) {
perror("bind failed");
exit(errno);
}
// Connect the socket to the server address (so we can send messages)
if (connect(s, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == -1) {
perror("connect failed");
exit(errno);
}
When I run this, I'm getting the error connect failed: Invalid argument. I don't see what I'm doing incorrectly here, though.

Answer 1

cli_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
...
serv_addr.sin_addr.s_addr = inet_addr("XXX.XXX.XXX.XXX");
You'll bind the socket to localhost (127.0.0.1) but then you connect to an address which likely is not localhost. There is no way such a TCP with a fully internal IP address (i.e. not accessible from outside the machine) to an IP address of a different system can be created, hence "Invalid argument".
It is unclear what you are trying to achieve with the bind in the first place so it might be the best to just remove it. In this case it will automatically pick a local IP and port which can be used in a connection to the given destination IP.