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net.c

/*
 * Copyright (c) 1989 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
/*static char sccsid[] = "from: @(#)net.c 5.5 (Berkeley) 6/1/90";*/
char net_rcsid[] = "$Id: net.c,v 1.9 1999/09/14 10:51:11 dholland Exp $";
#endif /* not lint */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include "finger.h"

void netfinger(const char *name) {
      register FILE *fp;
      struct in_addr defaddr;
      register int c, sawret, ateol;
      struct hostent *hp, def;
      struct servent *sp;
      struct sockaddr_in sn;
      int s;
      char *alist[1], *host;

      host = strrchr(name, '@');
      if (!host) return;
      *host++ = '\0';

      memset(&sn, 0, sizeof(sn));

      sp = getservbyname("finger", "tcp");
      if (!sp) {
            eprintf("finger: tcp/finger: unknown service\n");
            return;
      }
      sn.sin_port = sp->s_port;

      hp = gethostbyname(host);
      if (!hp) {
            if (!inet_aton(host, &defaddr)) {
                  eprintf("finger: unknown host: %s\n", host);
                  return;
            }
            def.h_name = host;
            def.h_addr_list = alist;
            def.h_addr = (char *)&defaddr;
            def.h_length = sizeof(struct in_addr);
            def.h_addrtype = AF_INET;
            def.h_aliases = 0;
            hp = &def;
      }
      sn.sin_family = hp->h_addrtype;
      if (hp->h_length > (int)sizeof(sn.sin_addr)) {
          hp->h_length = sizeof(sn.sin_addr);
      }
      memcpy(&sn.sin_addr, hp->h_addr, hp->h_length);

      if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) {
            eprintf("finger: socket: %s\n", strerror(errno));
            return;
      }

      /* print hostname before connecting, in case it takes a while */
      xprintf("[%s]\n", hp->h_name);
      if (connect(s, (struct sockaddr *)&sn, sizeof(sn)) < 0) {
            eprintf("finger: connect: %s\n", strerror(errno));
            close(s);
            return;
      }

      /* -l flag for remote fingerd  */
      if (lflag) write(s, "/W ", 3);

      /* send the name followed by <CR><LF> */
      write(s, name, strlen(name));
      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> or a <CR> with the high bit set, treat it as
       * a newline; if followed by a newline character, only output one
       * newline.
       *
       * Text is sent to xputc() for printability analysis.
       */ 
      fp = fdopen(s, "r");
      if (!fp) {
            eprintf("finger: fdopen: %s\n", strerror(errno));
            close(s);
            return;
      }

      sawret = 0;
      ateol = 1;
      while ((c = getc(fp)) != EOF) {
            c &= 0xff;
            if (c == ('\r'|0x80) || c == ('\n'|0x80)) c &= 0x7f;
            if (c == '\r') {
                  sawret = ateol = 1;
                  xputc('\n');
            } 
            else if (sawret && c == '\n') {
                  sawret = 0;
                  /* don't print */
            }
            else {
                  if (c == '\n') ateol = 1;
                  sawret = 0;
                  xputc(c);
            }
      }
      if (!ateol) xputc('\n');
      fclose(fp);
}

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