Basic client server help needed

[godonholiday]

I have written a basic client server program (2 programs), and all it displays is the words hello world. the files are bellow.

what i am trying to do is this:

once the connection is astablished the user is asked for their user name, if they are reg then they get access to some information, a little text file, if they are not reg then they do not.

can anyone help me with this.
i am programming in c on linux.

thanks in advance
g

/* An example client for "Hello, World!" server*/


#include <stdio.h> /* perror() */
#include <stdlib.h> /* atoi() */
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h> /* read() */
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

int main(int argc, char *argv[])
{
int clientSocket,
remotePort,
status = 0;
struct hostent *hostPtr = NULL;
struct sockaddr_in serverName = { 0 };
char buffer[256] = "";
char *remoteHost = NULL;

if (3 != argc)
{
fprintf(stderr, "Usage: %s <serverHost> <serverPort>\n",
argv[0]);
exit(1);
}

remoteHost = argv[1];
remotePort = atoi(argv[2]);

clientSocket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (-1 == clientSocket)
{
perror("socket()");
exit(1);
}

/*
* need to resolve the remote server name or IP address
*/
hostPtr = gethostbyname(remoteHost);
if (NULL == hostPtr)
{
hostPtr = gethostbyaddr(remoteHost, strlen(remoteHost),
AF_INET);
if (NULL == hostPtr)
{
perror("Error resolving server address ");
exit(1);
}
}

serverName.sin_family = AF_INET;
serverName.sin_port = htons(remotePort);
(void) memcpy(&serverName.sin_addr, hostPtr->h_addr,
hostPtr->h_length);

status = connect(clientSocket, (struct sockaddr*) &serverName,
sizeof(serverName));
if (-1 == status)
{
perror("connect()");
exit(1);
}

/*
* Client application specific code goes here
*
* e.g. receive messages from server, respond, etc.
*/
while (0 < (status = read(clientSocket, buffer,
sizeof(buffer) - 1)))
{
printf("%d: %s", status, buffer);
}

if (-1 == status)
{
perror("read()");
}

close(clientSocket);

return 0;
}
=================================


/* An example client for "Hello, World!" server*/


#include <stdio.h> /* perror() */
#include <stdlib.h> /* atoi() */
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h> /* read() */
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

int main(int argc, char *argv[])
{
int clientSocket,
remotePort,
status = 0;
struct hostent *hostPtr = NULL;
struct sockaddr_in serverName = { 0 };
char buffer[256] = "";
char *remoteHost = NULL;

if (3 != argc)
{
fprintf(stderr, "Usage: %s <serverHost> <serverPort>\n",
argv[0]);
exit(1);
}

remoteHost = argv[1];
remotePort = atoi(argv[2]);

clientSocket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (-1 == clientSocket)
{
perror("socket()");
exit(1);
}

/*
* need to resolve the remote server name or IP address
*/
hostPtr = gethostbyname(remoteHost);
if (NULL == hostPtr)
{
hostPtr = gethostbyaddr(remoteHost, strlen(remoteHost),
AF_INET);
if (NULL == hostPtr)
{
perror("Error resolving server address ");
exit(1);
}
}

serverName.sin_family = AF_INET;
serverName.sin_port = htons(remotePort);
(void) memcpy(&serverName.sin_addr, hostPtr->h_addr,
hostPtr->h_length);

status = connect(clientSocket, (struct sockaddr*) &serverName,
sizeof(serverName));
if (-1 == status)
{
perror("connect()");
exit(1);
}

/*
* Client application specific code goes here
*
* e.g. receive messages from server, respond, etc.
*/
while (0 < (status = read(clientSocket, buffer,
sizeof(buffer) - 1)))
{
printf("%d: %s", status, buffer);
}

if (-1 == status)
{
perror("read()");
}

close(clientSocket);

return 0;
}

[drewdaman]

well.. all you have to do is send and receive... to start with, instead of saying hello world, send a message asking for the username.. then have the client send it and verify it.. then send the text file.. what exactly is the problem? look into send and recv.

[godonholiday]

iv tried that, i dont know how to keep the client open,.

i know how to send the message but not how to ask them to enter some data and then store it.

any help would be great thanks
(another novice)