pull in very simple client/server demo code

inspired by http://www.linuxhowtos.org/C_C++/socket.htm

source/client/client.cpp

@@ -1,7 +1,85 @@
 #include "client.h"
 
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include <netdb.h>
+
+#include "net.h"
 
 int runClient(int argc, char* argv[])
 {
+    int sockfd; 	// socket File descriptor
+    int portno;		// Port number
+    int n = 0;		// return value for read and write calls
+
+    struct sockaddr_in serv_addr; // Server address
+
+    struct hostent *server; // pointer to host information
+
+    char buffer[1028]; // buffer for socked read
+    memset(buffer,0,sizeof(buffer));
+
+    // must provide information
+    if (argc < 2)
+    {
+        fprintf(stderr,"usage %s hostname\n", argv[0]);
+        exit(0);
+    }
+
+    // Get port number
+    portno = 11715;
+
+    // Create a new socket
+    // AF_INET is general internetsocked domain
+    // SOCK_STREAM as messages will be read in on this socket, SOCK_DGRAM would be for packets
+    // 0 is for default protocol
+    sockfd = socket(AF_INET, SOCK_STREAM, 0);
+    if (sockfd < 0)
+        error("ERROR opening socket");
+
+    // Get the hostent information for the host by name
+    server = gethostbyname(argv[1]);
+    if (server == NULL)
+        error("ERROR, no such host");
+
+    // Empty the server address struct
+    memset(&serv_addr,0, sizeof(serv_addr));
+
+    // Set the server to AF_INET
+    serv_addr.sin_family = AF_INET;
+
+    // copy the server address into our server_addr struct
+    memcpy(&serv_addr.sin_addr.s_addr, server->h_addr, server->h_length);
+
+    // Set our server address port to the port number provided
+    serv_addr.sin_port = htons(portno);
+
+    // Attempt to connect to the server using the socket and server address info
+    if (connect(sockfd, (const sockaddr*)&serv_addr, sizeof(serv_addr)) < 0)
+        error("ERROR connecting");
+
+    while ( n >= 0 )
+    {
+        // Get the message to send
+        printf("Please enter the message: ");
+        memset(buffer,0,sizeof(buffer));
+        fgets(buffer,sizeof(buffer)-1,stdin);
+
+        // Place a test message into the buffer
+        strncpy(buffer,buffer,sizeof(buffer));
+
+        // Write to the socket with the buffer
+        n = write(sockfd,buffer,strlen(buffer));
+        if (n < 0)
+            error("ERROR writing to socket");
+    }
+
     return 0;
 }