TestIRCServer.c

#include <time.h>
//#include <curses.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

char * user;
char * password;
char * host;
char * sport;
int port;

int open_client_socket(char * host, int port) {
	// Initialize socket address structure
	struct  sockaddr_in socketAddress;
	
	// Clear sockaddr structure
	memset((char *)&socketAddress,0,sizeof(socketAddress));
	
	// Set family to Internet 
	socketAddress.sin_family = AF_INET;
	
	// Set port
	socketAddress.sin_port = htons((u_short)port);
	
	// Get host table entry for this host
	struct  hostent  *ptrh = gethostbyname(host);
	if ( ptrh == NULL ) {
		perror("gethostbyname");
		exit(1);
	}
	
	// Copy the host ip address to socket address structure
	memcpy(&socketAddress.sin_addr, ptrh->h_addr, ptrh->h_length);
	
	// Get TCP transport protocol entry
	struct  protoent *ptrp = getprotobyname("tcp");
	if ( ptrp == NULL ) {
		perror("getprotobyname");
		exit(1);
	}
	
	// Create a tcp socket
	int sock = socket(PF_INET, SOCK_STREAM, ptrp->p_proto);
	if (sock < 0) {
		perror("socket");
		exit(1);
	}
	
	// Connect the socket to the specified server
	if (connect(sock, (struct sockaddr *)&socketAddress,
		    sizeof(socketAddress)) < 0) {
		perror("connect");
		exit(1);
	}
	
	return sock;
}

#define MAX_RESPONSE (10 * 1024)
int sendCommand(char *  host, int port, char * command, char * response) {
	
	int sock = open_client_socket( host, port);

	if (sock<0) {
		return 0;
	}

	// Send command
	write(sock, command, strlen(command));
	write(sock, "\r\n",2);

	//Print copy to stdout
	write(1, command, strlen(command));
	write(1, "\r\n",2);

	// Keep reading until connection is closed or MAX_REPONSE
	int n = 0;
	int len = 0;
	while ((n=read(sock, response+len, MAX_RESPONSE - len))>0) {
		len += n;
	}
	response[len]=0;

	printf("response:\n%s\n", response);

	close(sock);

	return 1;
}
	
void
printUsage()
{
	printf("Usage: test-talk-server host port command\n");
	exit(1);
}

int
main(int argc, char **argv) {

	char * command;
	
	if (argc < 4) {
		printUsage();
	}

	host = argv[1];
	sport = argv[2];
	command = argv[3];

	sscanf(sport, "%d", &port);
	
	char response[MAX_RESPONSE];
	sendCommand(host, port, command, response);

	return 0;
}