SimpleClient.c

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



int main(int argc, char *argv[]) {
    int simpleSocket = 0;
    int simplePort = 0;
    int returnStatus = 0;
    char buffer[256] = "";
    struct sockaddr_in simpleServer;
    if (3 != argc) {
	fprintf(stderr, "Usage: %s <server> <port>\n", argv[0]);
	exit(1);
    }
    /* create a streaming socket */
    simpleSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (simpleSocket == -1) {
	fprintf(stderr, "Could not create a socket!\n");
	exit(1);
    }
    else {
	fprintf(stderr, "Socket created!\n");
    }
    /* retrieve the port number for connecting */
    simplePort = atoi(argv[2]);
    /* set up the address structure */
    /* use the IP address argument for the server address */
    bzero(&simpleServer, sizeof(simpleServer));
    simpleServer.sin_family = AF_INET;
    inet_aton(argv[1], &simpleServer.sin_addr.s_addr);
    simpleServer.sin_port = htons(simplePort);
    /* connect to the address and port with our socket */
    returnStatus = connect(simpleSocket,
	    (struct sockaddr *)&simpleServer,
	    sizeof(simpleServer));
    if (returnStatus == 0) {
	fprintf(stderr, "Connect successful!\n");
    }
    else {
	fprintf(stderr, "Could not connect to address!\n");
	close(simpleSocket);
	exit(1);
    }
    /* get the message from the server */
    returnStatus = read(simpleSocket, buffer, sizeof(buffer));
    if ( returnStatus > 0 ) {
	printf("%d: %s", returnStatus, buffer);
    }
    else {
	fprintf(stderr, "Return Status = %d \n", returnStatus);
    }
    close(simpleSocket);
    return 0;
}