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TCP/IP program to do TCP ECHO, TCP CHARGEN , TCP DAYTIME, TCP TIME on the given socket

Posted By: Milind Mishra     Category: Networking     Views: 4124

TCP/IP program to do TCP ECHO, TCP CHARGEN , TCP DAYTIME, TCP TIME on the given socket.

Code for TCP/IP program to do TCP ECHO, TCP CHARGEN , TCP DAYTIME, TCP TIME on the given socket in Networking

/* sv_funcs.c - TCPechod, TCPchargend, TCPdaytimed, TCPtimed */

#include <sys/types.h>

#include <unistd.h>
#include <stdio.h>
#include <time.h>
#include <string.h>

#define    BUFFERSIZE    4096        /* max read buffer size    */externint    errno;

int    TCPechod(int), TCPchargend(int), TCPdaytimed(int), TCPtimed(int);
int    errexit(constchar *format, ...);

/*------------------------------------------------------------------------ * TCPecho - do TCP ECHO on the given socket *------------------------------------------------------------------------ */int
TCPechod(int fd)
{
    char    buf[BUFFERSIZE];
    int    cc;

    while (cc = read(fd, buf, sizeof buf)) {
        if (cc < 0)
            errexit("echo read: %s\n", strerror(errno));
        if (write(fd, buf, cc) < 0)
            errexit("echo write: %s\n", strerror(errno));
    }
    return 0;
}

#define    LINELEN        72

/*------------------------------------------------------------------------ * TCPchargend - do TCP CHARGEN on the given socket *------------------------------------------------------------------------ */int
TCPchargend(int fd)
{
    char    c, buf[LINELEN+2];    /* print LINELEN chars + \r\n */

    c = ' ';
    buf[LINELEN] = '\r';
    buf[LINELEN+1] = '\n';
    while (1) {
        int    i;

        for (i=0; i<LINELEN; ++i) {
            buf[i] = c++;
            if (c > '~')
                c = ' ';
        }
        if (write(fd, buf, LINELEN+2) < 0)
            break;
    }
    return 0;
}

/*------------------------------------------------------------------------ * TCPdaytimed - do TCP DAYTIME protocol *------------------------------------------------------------------------ */int
TCPdaytimed(int fd)
{
    char    buf[LINELEN], *ctime();
    time_t    now;

    (void) time(&now);
    sprintf(buf, "%s", ctime(&now));
    (void) write(fd, buf, strlen(buf));
    return 0;
}

#define    UNIXEPOCH    2208988800    /* UNIX epoch, in UCT secs    *//*------------------------------------------------------------------------ * TCPtimed - do TCP TIME protocol *------------------------------------------------------------------------ */int
TCPtimed(int fd)
{
    time_t    now;

    (void) time(&now);
    now = htonl((u_long)(now + UNIXEPOCH));
    (void) write(fd, (char *)&now, sizeof(now));
    return 0;
}
  
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Milind Mishra
Milind Mishra author of TCP/IP program to do TCP ECHO, TCP CHARGEN , TCP DAYTIME, TCP TIME on the given socket is from India.
 
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