usr.bin/finger/net.c

   1 /*      $NetBSD: net.c,v 1.23 2009/04/12 06:18:54 lukem Exp $   */
   2
   3 /*
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)net.c       8.4 (Berkeley) 4/28/95";
  39 #else
  40 __RCSID("$NetBSD: net.c,v 1.23 2009/04/12 06:18:54 lukem Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <sys/types.h>
  45 #include <sys/socket.h>
  46
  47 #include <netinet/in.h>
  48
  49 #include <arpa/inet.h>
  50
  51 #include <netdb.h>
  52 #include <time.h>
  53 #include <db.h>
  54 #include <unistd.h>
  55 #include <pwd.h>
  56 #include <stdio.h>
  57 #include <string.h>
  58 #include <ctype.h>
  59 #include <err.h>
  60
  61 #include "utmpentry.h"
  62
  63 #include "finger.h"
  64 #include "extern.h"
  65
  66 void
  67 netfinger(char *name)
  68 {
  69         FILE *fp;
  70         int c, lastc;
  71         int s;
  72         char *host;
  73         struct addrinfo hints, *res, *res0;
  74         int error;
  75         const char *emsg = NULL;
  76
  77         lastc = 0;
  78         if (!(host = strrchr(name, '@')))
  79                 return;
  80         *host++ = '\0';
  81         memset(&hints, 0, sizeof(hints));
  82         hints.ai_family = PF_UNSPEC;
  83         hints.ai_socktype = SOCK_STREAM;
  84         hints.ai_flags = AI_CANONNAME;
  85         error = getaddrinfo(host, "finger", &hints, &res0);
  86         if (error) {
  87                 warnx("%s: %s", gai_strerror(error), host);
  88                 return;
  89         }
  90
  91         s = -1;
  92         for (res = res0; res; res = res->ai_next) {
  93                 s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
  94                 if (s < 0) {
  95                         emsg = "socket";
  96                         continue;
  97                 }
  98
  99                 if (connect(s, res->ai_addr, res->ai_addrlen)) {
 100                         close(s);
 101                         s = -1;
 102                         emsg = "connect";
 103                         continue;
 104                 }
 105
 106                 break;
 107         }
 108         if (s < 0) {
 109                 if (emsg != NULL)
 110                         warn("%s", emsg);
 111                 return;
 112         }
 113
 114         /* have network connection; identify the host connected with */
 115         (void)printf("[%s]\n", res0->ai_canonname ? res0->ai_canonname : host);
 116
 117         /* -l flag for remote fingerd  */
 118         if (lflag)
 119                 write(s, "/W ", 3);
 120         /* send the name followed by <CR><LF> */
 121         (void)write(s, name, strlen(name));
 122         (void)write(s, "\r\n", 2);
 123
 124         /*
 125          * Read from the remote system; once we're connected, we assume some
 126          * data.  If none arrives, we hang until the user interrupts.
 127          *
 128          * If we see a <CR> followed by a newline character, only output
 129          * one newline.
 130          *
 131          * If a character isn't printable and it isn't a space, we strip the
 132          * 8th bit and set the 7th bit.  Every ASCII character with bit 7 set
 133          * is printable.
 134          */
 135         if ((fp = fdopen(s, "r")) != NULL)
 136                 while ((c = getc(fp)) != EOF) {
 137                         if (c == '\r') {
 138                                 if (lastc == '\r')      /* ^M^M - skip dupes */
 139                                         continue;
 140                                 c = '\n';
 141                                 lastc = '\r';
 142                         } else {
 143                                 if (!(eightflag || isprint(c) || isspace(c))) {
 144                                         c &= 0x7f;
 145                                         c |= 0x40;
 146                                 }
 147                                 if (lastc != '\r' || c != '\n')
 148                                         lastc = c;
 149                                 else {
 150                                         lastc = '\n';
 151                                         continue;
 152                                 }
 153                         }
 154                         putchar(c);
 155                 }
 156         if (lastc != '\n')
 157                 putchar('\n');
 158         (void)fclose(fp);
 159 }