Socket programming, using ip addresses - c

Question

I have a simple tcp client server program. Client sends text, server prints it ito terminal. I need to make it so client can connect to server by ip address, no just a port (i have it on localhost now). How can I do this? Tried many things, getting errors everytime.
Here's the client code:
int client(char * add) //add is an address passed, either hostname (for ex. google.com)
{ //or just a normal dotted ip (1.2.3.4)
int s, t, len;
struct sockaddr_un remote;
char str[100];
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
printf("Trying to connect...\n");
remote.sun_family = AF_UNIX;
strcpy(remote.sun_path, SOCK_PATH);
len = strlen(remote.sun_path) + sizeof(remote.sun_family);
if (connect(s, (struct sockaddr *)&remote, len) == -1) {
perror("connect");
exit(1);
}
printf("Connected.\n");
int i=0;
while(fgets(str, 100, stdin)) {
if (send(s, str, strlen(str), 0) == -1) {
perror("send");
exit(1);
}
}
close(s);
return 0;
}
And tere's a server:
int server(void)
{
int s, s2, t, len;
int z;
struct sockaddr_un local, remote;
char str[100];
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
local.sun_family = AF_UNIX;
strcpy(local.sun_path, SOCK_PATH);
unlink(local.sun_path);
len = strlen(local.sun_path) + sizeof(local.sun_family);
if (bind(s, (struct sockaddr *)&local, len) == -1) {
perror("bind");
exit(1);
}
if (listen(s, 5) == -1) {
perror("listen");
exit(1);
}
for(;;) {
int done, n;
t = sizeof(remote);
if ((s2 = accept(s, (struct sockaddr *) &remote, (socklen_t *) &t)) == -1) {
perror("accept");
exit(1);
}
done = 0;
do {
n = recv(s2, str, 100, 0);
if (n <= 0) {
if (n < 0) perror("recv");
done = 1;
}
if (!done)
printf("%s", str);
fflush(stdout);
sleep(1);
} while (!done);
close(s2);
}
return 0;
}
Can I connect my client with that server using ip address?
My driver funtion chooses if I want to start a server or a client, it's all in one file.
To start a server i use:
./main.o -l [port]
and to start a client I'd want to use:
./main.o [address] [port]
I don't realy know how to translate the address and then use it to connect. I mean, I've tried gethostbyname(), but then I didn't know where tu put this address because sockaddr_un has no address field to fill.