Sorry, I should have included the TCPEchoServer and TCPEchoClient classes which deal with creating the socket.
TCPEchoServer is bellow:
Code:
#include <stdio.h> /* for printf() and fprintf() */
#include <sys/socket.h> /* for socket(), bind(), and connect() */
#include <arpa/inet.h> /* for sockaddr_in and inet_ntoa() */
#include <stdlib.h> /* for atoi() and exit() */
#include <string.h> /* for memset() */
#include <unistd.h> /* for close() */
#define MAXPENDING 5 /* Maximum outstanding connection requests */
void DieWithError(char *errorMessage); /* Error handling function */
void HandleTCPClient(int clntSocket); /* TCP client handling function */
int main(int argc, char *argv[])
{
int servSock; /* Socket descriptor for server */
int clntSock; /* Socket descriptor for client */
struct sockaddr_in echoServAddr; /* Local address */
struct sockaddr_in echoClntAddr; /* Client address */
unsigned short echoServPort; /* Server port */
unsigned int clntLen; /* Length of client address data structure */
echoServPort = 9165; /* First arg: local port */
/* Create socket for incoming connections */
if ((servSock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
DieWithError("socket() failed");
/* Construct local address structure */
memset(&echoServAddr, 0, sizeof(echoServAddr)); /* Zero out structure */
echoServAddr.sin_family = AF_INET; /* Internet address family */
echoServAddr.sin_addr.s_addr = htonl(INADDR_ANY); /* Any incoming interface */
echoServAddr.sin_port = htons(echoServPort); /* Local port */
/* Bind to the local address */
if (bind(servSock, (struct sockaddr *) &echoServAddr, sizeof(echoServAddr)) < 0)
DieWithError("bind() failed");
/* Mark the socket so it will listen for incoming connections */
if (listen(servSock, MAXPENDING) < 0)
DieWithError("listen() failed");
for (;;) /* Run forever */
{
/* Set the size of the in-out parameter */
clntLen = sizeof(echoClntAddr);
/* Wait for a client to connect */
if ((clntSock = accept(servSock, (struct sockaddr *) &echoClntAddr,
&clntLen)) < 0)
DieWithError("accept() failed");
/* clntSock is connected to a client! */
printf("Handling client %s\n", inet_ntoa(echoClntAddr.sin_addr));
HandleTCPClient(clntSock);
}
/* NOT REACHED */
}
TCPEchoClient
Code:
#include <stdio.h> /* for printf() and fprintf() */
#include <sys/socket.h> /* for socket(), connect(), send(), and recv() */
#include <arpa/inet.h> /* for sockaddr_in and inet_addr() */
#include <stdlib.h> /* for atoi() and exit() */
#include <string.h> /* for memset() */
#include <unistd.h> /* for close() */
#define RCVBUFSIZE 32 /* Size of receive buffer */
void DieWithError(char *errorMessage); /* Error handling function */
int main(int argc, char *argv[])
{
int sock; /* Socket descriptor */
struct sockaddr_in echoServAddr; /* Echo server address */
short echoServPort; /* Echo server port */
char *servIP; /* Server IP address (dotted quad) */
char *echoString; /* String to send to echo server */
char echoBuffer[RCVBUFSIZE]; /* Buffer for echo string */
unsigned int echoStringLen; /* Length of string to echo */
int bytesRcvd, totalBytesRcvd; /* Bytes read in single recv()
and total bytes read */
if ((argc < 2) || (argc > 3)) /* Test for correct number of arguments */
{
fprintf(stderr, "Usage: %s <Server IP> <Echo Word> [<Echo Port>]\n",
argv[0]);
exit(1);
}
argv[4] = argv[3];
servIP = argv[1]; /* First arg: server IP address (dotted quad) */
echoString = argv[2]; /* Second arg: string to echo */
if (argc == 4)
echoServPort = 9165; /* Use given port, if any */
else
echoServPort = 9165; /* 7 is the well-known port for the echo service */
/* Create a reliable, stream socket using TCP */
if ((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
DieWithError("socket() failed");
/* Construct the server address structure */
memset(&echoServAddr, 0, sizeof(echoServAddr)); /* Zero out structure */
echoServAddr.sin_family = AF_INET; /* Internet address family */
echoServAddr.sin_addr.s_addr = inet_addr(servIP); /* Server IP address */
echoServAddr.sin_port = htons(echoServPort); /* Server port */
/* Establish the connection to the echo server */
if (connect(sock, (struct sockaddr *) &echoServAddr, sizeof(echoServAddr)) < 0)
DieWithError("connect() failed");
echoStringLen = strlen(echoString); /* Determine input length */
/* Send the string to the server */
if (send(sock, echoString, echoStringLen, 0) != echoStringLen)
DieWithError("send() sent a different number of bytes than expected");
/* Receive the same string back from the server */
totalBytesRcvd = 0;
printf("Received: "); /* Setup to print the echoed string */
while (totalBytesRcvd < echoStringLen)
{
/* Receive up to the buffer size (minus 1 to leave space for
a null terminator) bytes from the sender */
if ((bytesRcvd = recv(sock, echoBuffer, 3 - 1, 0)) <= 0)
DieWithError("recv() failed or connection closed prematurely");
totalBytesRcvd += bytesRcvd; /* Keep tally of total bytes */
echoBuffer[bytesRcvd] = '\0'; /* Terminate the string! */
printf("%s", echoBuffer); /* Print the echo buffer */
}
printf("\n"); /* Print a final linefeed */
close(sock);
exit(0);
}
Ive changed the if statement to this:
Code:
if(strcmp(echoBuffer, "1") == 0)
{
echoBuffer = "One";
recvMsgSize = 3;
}
I think the problem is I'm trying to put the word "One" into a character string and there different types. The Error on the above code is:
HandleTCPClient.c: In function ‘HandleTCPClient’:
HandleTCPClient.c:40: error: subscripted value is neither array nor pointer
Line 39 = echoBuffer = "One";
Line 40 = recvMsgSize = 3;
Thanks for any help. I've just started leaning see and having done java for the past few years I've got to get used to the syntax.