/*      $NetBSD: net.c,v 1.23 2009/04/12 06:18:54 lukem Exp $   */

/*
* Copyright (c) 1989, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)net.c       8.4 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: net.c,v 1.23 2009/04/12 06:18:54 lukem Exp $");
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <netdb.h>
#include <time.h>
#include <db.h>
#include <unistd.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <err.h>

#include "utmpentry.h"

#include "finger.h"
#include "extern.h"

void
netfinger(char *name)
{
       FILE *fp;
       int c, lastc;
       int s;
       char *host;
       struct addrinfo hints, *res, *res0;
       int error;
       const char *emsg = NULL;

       lastc = 0;
       if (!(host = strrchr(name, '@')))
               return;
       *host++ = '\0';
       memset(&hints, 0, sizeof(hints));
       hints.ai_family = PF_UNSPEC;
       hints.ai_socktype = SOCK_STREAM;
       hints.ai_flags = AI_CANONNAME;
       error = getaddrinfo(host, "finger", &hints, &res0);
       if (error) {
               warnx("%s: %s", gai_strerror(error), host);
               return;
       }

       s = -1;
       for (res = res0; res; res = res->ai_next) {
               s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
               if (s < 0) {
                       emsg = "socket";
                       continue;
               }

               if (connect(s, res->ai_addr, res->ai_addrlen)) {
                       close(s);
                       s = -1;
                       emsg = "connect";
                       continue;
               }

               break;
       }
       if (s < 0) {
               if (emsg != NULL)
                       warn("%s", emsg);
               return;
       }

       /* have network connection; identify the host connected with */
       (void)printf("[%s]\n", res0->ai_canonname ? res0->ai_canonname : host);

       /* -l flag for remote fingerd  */
       if (lflag)
               write(s, "/W ", 3);
       /* send the name followed by <CR><LF> */
       (void)write(s, name, strlen(name));
       (void)write(s, "\r\n", 2);

       /*
        * Read from the remote system; once we're connected, we assume some
        * data.  If none arrives, we hang until the user interrupts.
        *
        * If we see a <CR> followed by a newline character, only output
        * one newline.
        *
        * If a character isn't printable and it isn't a space, we strip the
        * 8th bit and set the 7th bit.  Every ASCII character with bit 7 set
        * is printable.
        */
       if ((fp = fdopen(s, "r")) != NULL)
               while ((c = getc(fp)) != EOF) {
                       if (c == '\r') {
                               if (lastc == '\r')      /* ^M^M - skip dupes */
                                       continue;
                               c = '\n';
                               lastc = '\r';
                       } else {
                               if (!(eightflag || isprint(c) || isspace(c))) {
                                       c &= 0x7f;
                                       c |= 0x40;
                               }
                               if (lastc != '\r' || c != '\n')
                                       lastc = c;
                               else {
                                       lastc = '\n';
                                       continue;
                               }
                       }
                       putchar(c);
               }
       if (lastc != '\n')
               putchar('\n');
       (void)fclose(fp);
}