Home | History | Annotate | Line # | Download | only in finger 
      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 }
    160