base/applications/network/finger/net.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include <winsock2.h>
  38 #include <stdio.h>
  39 #include <ctype.h>
  40 #include <string.h>
  41
  42 #include "various.h"
  43
  44 void
  45 netfinger(char *name)
  46 {
  47         extern int lflag;
  48         char c, lastc;
  49         struct in_addr defaddr;
  50         struct hostent *hp, def;
  51         struct servent *sp;
  52         struct sockaddr_in sin;
  53         SOCKET s;
  54         char *alist[1], *host;
  55
  56         /* If this is a local request */
  57         if (!(host = rindex(name, '@')))
  58                 return;
  59
  60         *host++ = '\0';
  61         if (isdigit(*host) && (defaddr.s_addr = inet_addr(host)) != (unsigned long)-1) {
  62                 def.h_name = host;
  63                 def.h_addr_list = alist;
  64                 def.h_addr = (char *)&defaddr;
  65                 def.h_length = sizeof(struct in_addr);
  66                 def.h_addrtype = AF_INET;
  67                 def.h_aliases = 0;
  68                 hp = &def;
  69         } else if (!(hp = gethostbyname(host))) {
  70                 (void)fprintf(stderr,
  71                     "finger: unknown host: %s\n", host);
  72                 return;
  73         }
  74         if (!(sp = getservbyname("finger", "tcp"))) {
  75                 (void)fprintf(stderr, "finger: tcp/finger: unknown service\n");
  76                 return;
  77         }
  78         sin.sin_family = hp->h_addrtype;
  79         bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
  80         sin.sin_port = sp->s_port;
  81         if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) == INVALID_SOCKET) {
  82                 perror("finger: socket");
  83                 return;
  84         }
  85
  86         /* have network connection; identify the host connected with */
  87         (void)printf("[%s]\n", hp->h_name);
  88         if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
  89                 fprintf(stderr, "finger: connect rc = %d", WSAGetLastError());
  90                 (void)closesocket(s);
  91                 return;
  92         }
  93
  94         /* -l flag for remote fingerd  */
  95         if (lflag)
  96                 send(s, "/W ", 3, 0);
  97         /* send the name followed by <CR><LF> */
  98         send(s, name, strlen(name), 0);
  99         send(s, "\r\n", 2, 0);
 100
 101         /*
 102          * Read from the remote system; once we're connected, we assume some
 103          * data.  If none arrives, we hang until the user interrupts.
 104          *
 105          * If we see a <CR> or a <CR> with the high bit set, treat it as
 106          * a newline; if followed by a newline character, only output one
 107          * newline.
 108          *
 109          * Otherwise, all high bits are stripped; if it isn't printable and
 110          * it isn't a space, we can simply set the 7th bit.  Every ASCII
 111          * character with bit 7 set is printable.
 112          */
 113         lastc = 0;
 114         while (recv(s, &c, 1, 0) == 1) {
 115                 c &= 0x7f;
 116                 if (c == 0x0d) {
 117                         if (lastc == '\r')      /* ^M^M - skip dupes */
 118                                 continue;
 119                         c = '\n';
 120                         lastc = '\r';
 121                 } else {
 122                         if (!isprint(c) && !isspace(c))
 123                                 c |= 0x40;
 124                         if (lastc != '\r' || c != '\n')
 125                                 lastc = c;
 126                         else {
 127                                 lastc = '\n';
 128                                 continue;
 129                         }
 130                 }
 131                 putchar(c);
 132         }
 133         if (lastc != '\n')
 134                 putchar('\n');
 135         putchar('\n');
 136 }