reactos/apps/utils/net/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 #include <sys/types.h>
  37 #include <winsock2.h>
  38 #include "unistd.h"
  39 #include <stdio.h>
  40 #include <ctype.h>
  41 #include <string.h>
  42
  43 #include "various.h"
  44
  45 void
  46 netfinger(char *name)
  47 {
  48         extern int lflag;
  49         char c, lastc;
  50         struct in_addr defaddr;
  51         struct hostent *hp, def;
  52         struct servent *sp;
  53         struct sockaddr_in sin;
  54         SOCKET s;
  55         char *alist[1], *host;
  56
  57         /* If this is a local request */
  58         if (!(host = rindex(name, '@')))
  59                 return;
  60
  61         *host++ = '\0';
  62         if (isdigit(*host) && (defaddr.s_addr = inet_addr(host)) != (unsigned long)-1) {
  63                 def.h_name = host;
  64                 def.h_addr_list = alist;
  65                 def.h_addr = (char *)&defaddr;
  66                 def.h_length = sizeof(struct in_addr);
  67                 def.h_addrtype = AF_INET;
  68                 def.h_aliases = 0;
  69                 hp = &def;
  70         } else if (!(hp = gethostbyname(host))) {
  71                 (void)fprintf(stderr,
  72                     "finger: unknown host: %s\n", host);
  73                 return;
  74         }
  75         if (!(sp = getservbyname("finger", "tcp"))) {
  76                 (void)fprintf(stderr, "finger: tcp/finger: unknown service\n");
  77                 return;
  78         }
  79         sin.sin_family = hp->h_addrtype;
  80         bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
  81         sin.sin_port = sp->s_port;
  82         if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) == INVALID_SOCKET) {
  83                 perror("finger: socket");
  84                 return;
  85         }
  86
  87         /* have network connection; identify the host connected with */
  88         (void)printf("[%s]\n", hp->h_name);
  89         if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
  90                 fprintf(stderr, "finger: connect rc = %d", WSAGetLastError());
  91                 (void)close(s);
  92                 return;
  93         }
  94
  95         /* -l flag for remote fingerd  */
  96         if (lflag)
  97                 send(s, "/W ", 3, 0);
  98         /* send the name followed by <CR><LF> */
  99         send(s, name, strlen(name), 0);
 100         send(s, "\r\n", 2, 0);
 101
 102         /*
 103          * Read from the remote system; once we're connected, we assume some
 104          * data.  If none arrives, we hang until the user interrupts.
 105          *
 106          * If we see a <CR> or a <CR> with the high bit set, treat it as
 107          * a newline; if followed by a newline character, only output one
 108          * newline.
 109          *
 110          * Otherwise, all high bits are stripped; if it isn't printable and
 111          * it isn't a space, we can simply set the 7th bit.  Every ASCII
 112          * character with bit 7 set is printable.
 113          */
 114         lastc = 0;
 115         while (recv(s, &c, 1, 0) == 1) {
 116                 c &= 0x7f;
 117                 if (c == 0x0d) {
 118                         if (lastc == '\r')      /* ^M^M - skip dupes */
 119                                 continue;
 120                         c = '\n';
 121                         lastc = '\r';
 122                 } else {
 123                         if (!isprint(c) && !isspace(c))
 124                                 c |= 0x40;
 125                         if (lastc != '\r' || c != '\n')
 126                                 lastc = c;
 127                         else {
 128                                 lastc = '\n';
 129                                 continue;
 130                         }
 131                 }
 132                 putchar(c);
 133         }
 134         if (lastc != '\n')
 135                 putchar('\n');
 136         putchar('\n');
 137 }