Right:)
After a bit of researching and editing, I have come up with this for my client.c:
#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() */
#include <netdb.h>
#define RCVBUFSIZE 64 /* Size of receive buffer */
#define PORT 80
#define USERAGENT "HTMLGET 1.0"
void DieWithError(char *errorMessage); /* Error handling function */
int main(int argc, char *argv[])
{
int sock; /* Socket descriptor */
struct sockaddr_in echoServAddr; /* Echo server address */
unsigned 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 < 3) || (argc > 4)) /* Test for correct number of arguments */
{
fprintf(stderr, "Usage: %s <servername> <message> <Echo Port>\n",
argv[0]);
exit(1);
}
servIP = argv[1]; /* First arg: server IP address (dotted quad) */
if (argc == 4)
echoServPort = atoi(argv[3]); /* Use given port, if any */
else
echoServPort = 7; /* 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");
/* If connected then send the message */
if ( connect(sock, (struct sockaddr*)&echoServAddr, sizeof(echoServAddr)) == 0)
{ char s[200];
FILE *fp = fdopen(sock, "r+"); /* convert into stream */
fprintf(fp, argv[2]); /* send request */
fprintf(fp, "\n\n"); /* add some newlines */
fflush(fp); /* ensure it got out */
while ( fgets(s, sizeof(s), fp) != 0 )/* while not EOF ...*/
fputs(s, stdout); /*... print the data */
fclose(fp); /* close the socket */
}
/* 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, RCVBUFSIZE - 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);
}//-- end main --//
//
////
//
void DieWithError(char *errorMessage)
{
perror(errorMessage);
exit(1);
}
But..........
It is complaining about line 53.
This is the warning it gives me
Line 53 is
fprintf(fp, argv[2]); /* send request */
Could you please check!!!
Thanks
