whois.c File Reference

#include <windef.h>
#include <winsock2.h>
#include <stdio.h>
#include <stdlib.h>

Include dependency graph for whois.c:

Go to the source code of this file.

Macros
#define	WIN32_NO_STATUS
#define	_INC_WINDOWS

Functions
static void	usage ()
static void	cleanup (int iExitCode)
void	getwhoisserver (int argc, char **argv)
int	main (int argc, char **argv)

Variables
static char	NICHOST [] = "whois.internic.net"
char *	host = NULL
int	optset = 0

Macro Definition Documentation

_INC_WINDOWS

#define _INC_WINDOWS

Definition at line 42 of file whois.c.

WIN32_NO_STATUS

#define WIN32_NO_STATUS

Definition at line 40 of file whois.c.

Function Documentation

cleanup()

static void cleanup ( int  iExitCode )

static

Definition at line 181 of file whois.c.

{
    WSACleanup();
    exit(iExitCode);
}

getwhoisserver()

void getwhoisserver	(	int	argc,
		char **	argv
	)

Definition at line 60 of file whois.c.

{
    int i = 1;
 
    while(i < argc)
    {
        if (!strcmp(argv[i], "-h"))
        {
            if (i + 2 < argc)
            {
                host = argv[i +1];
                optset = i + 1;
            }
            else
            {
                optset = argc;
            }
            return;
        }
        i++;
    }
    host = NICHOST;
    optset = 1;
}

Referenced by main().

main()

int main	(	int argc	,
		char **	argv
	)

Definition at line 85 of file whois.c.

{
    char ch;
    struct sockaddr_in sin;
    struct hostent *hp;
    struct servent *sp;
    SOCKET s;
 
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;
 
    getwhoisserver(argc, argv);
    argc -= optset;
    argv += optset;
 
    if (!host || !argc)
        usage();
 
    /* Start winsock */
    wVersionRequested = MAKEWORD( 1, 1 );
    err = WSAStartup( wVersionRequested, &wsaData );
    if ( err != 0 )
    {
        /* Tell the user that we couldn't find a usable */
        /* WinSock DLL.                                 */
        perror("whois: WSAStartup failed");
        cleanup(1);
    }
 
    hp = gethostbyname(host);
    if (hp == NULL) {
        (void)fprintf(stderr, "whois: %s: ", host);
        cleanup(1);
    }
    host = hp->h_name;
 
    s = socket(hp->h_addrtype, SOCK_STREAM, 0);
    if (s == INVALID_SOCKET) {
        perror("whois: socket");
        cleanup(1);
    }
 
    memset(/*(caddr_t)*/&sin, 0, sizeof(sin));
    sin.sin_family = hp->h_addrtype;
    if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
        perror("whois: bind");
        cleanup(1);
    }
 
    memcpy((char *)&sin.sin_addr, hp->h_addr, hp->h_length);
    sp = getservbyname("nicname", "tcp");
    if (sp == NULL) {
        (void)fprintf(stderr, "whois: nicname/tcp: unknown service\n");
        cleanup(1);
    }
 
    sin.sin_port = sp->s_port;
 
    /* have network connection; identify the host connected with */
    (void)printf("[%s]\n", hp->h_name);
 
    if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
        fprintf(stderr, "whois: connect error = %d\n", WSAGetLastError());
        cleanup(1);
    }
 
    /* WinSock doesn't allow using a socket as a file descriptor. */
    /* Have to use send() and recv().  whois will drop connection. */
 
    /* For each request */
    while (argc-- > 1)
    {
        /* Send the request */
        send(s, *argv, strlen(*argv), 0);
        send(s, " ", 1, 0);
        argv++;
    }
    /* Send the last request */
    send(s, *argv, strlen(*argv), 0);
    send(s, "\r\n", 2, 0);
 
    /* Receive anything and print it */
    while (recv(s, &ch, 1, 0) == 1)
        putchar(ch);
 
    cleanup(0);
    return 0;
}

usage()

static void usage ( void  )

static

Definition at line 175 of file whois.c.

{
    (void)fprintf(stderr, "usage: whois [-h hostname] name ...\n");
    cleanup(1);
}

Referenced by main().

Variable Documentation

host

char* host = NULL

Definition at line 55 of file whois.c.

NICHOST

char NICHOST[] = "whois.internic.net"

static

Definition at line 54 of file whois.c.

Referenced by getwhoisserver().

optset

int optset = 0

Definition at line 56 of file whois.c.

Referenced by getwhoisserver(), and main().