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net.c revision 1.10 
      1 /*	$NetBSD: net.c,v 1.10 1997/10/19 08:13:42 mrg 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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #ifndef lint
     41 #if 0
     42 static char sccsid[] = "@(#)net.c	8.4 (Berkeley) 4/28/95";
     43 #else
     44 __RCSID("$NetBSD: net.c,v 1.10 1997/10/19 08:13:42 mrg Exp $");
     45 #endif
     46 #endif /* not lint */
     47 
     48 #include <sys/types.h>
     49 #include <sys/socket.h>
     50 
     51 #include <netinet/in.h>
     52 
     53 #include <arpa/inet.h>
     54 
     55 #include <netdb.h>
     56 #include <db.h>
     57 #include <unistd.h>
     58 #include <pwd.h>
     59 #include <utmp.h>
     60 #include <stdio.h>
     61 #include <string.h>
     62 #include <ctype.h>
     63 #include <unistd.h>
     64 
     65 #include "finger.h"
     66 #include "extern.h"
     67 
     68 void
     69 netfinger(name)
     70 	char *name;
     71 {
     72 	FILE *fp;
     73 	int c, lastc;
     74 	struct hostent *hp;
     75 	struct servent *sp;
     76 	struct sockaddr_in sin;
     77 	int s;
     78 	char *host;
     79 
     80 	lastc = 0;
     81 	if (!(host = strrchr(name, '@')))
     82 		return;
     83 	*host++ = '\0';
     84 	if (inet_aton(host, &sin.sin_addr) == 0) {
     85 		hp = gethostbyname(host);
     86 		if (hp == 0) {
     87 			(void)fprintf(stderr,
     88 			    "finger: unknown host: %s\n", host);
     89 			return;
     90 		}
     91 		sin.sin_family = hp->h_addrtype;
     92 		bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
     93 		host = hp->h_name;
     94 	} else
     95 		sin.sin_family = AF_INET;
     96 	if (!(sp = getservbyname("finger", "tcp"))) {
     97 		(void)fprintf(stderr, "finger: tcp/finger: unknown service\n");
     98 		return;
     99 	}
    100 	sin.sin_port = sp->s_port;
    101 	if ((s = socket(sin.sin_family, SOCK_STREAM, 0)) < 0) {
    102 		perror("finger: socket");
    103 		return;
    104 	}
    105 
    106 	/* have network connection; identify the host connected with */
    107 	(void)printf("[%s]\n", host);
    108 	if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
    109 		perror("finger: connect");
    110 		(void)close(s);
    111 		return;
    112 	}
    113 
    114 	/* -l flag for remote fingerd  */
    115 	if (lflag)
    116 		write(s, "/W ", 3);
    117 	/* send the name followed by <CR><LF> */
    118 	(void)write(s, name, strlen(name));
    119 	(void)write(s, "\r\n", 2);
    120 
    121 	/*
    122 	 * Read from the remote system; once we're connected, we assume some
    123 	 * data.  If none arrives, we hang until the user interrupts.
    124 	 *
    125 	 * If we see a <CR> or a <CR> with the high bit set, treat it as
    126 	 * a newline; if followed by a newline character, only output one
    127 	 * newline.
    128 	 *
    129 	 * Otherwise, all high bits are stripped; if it isn't printable and
    130 	 * it isn't a space, we can simply set the 7th bit.  Every ASCII
    131 	 * character with bit 7 set is printable.
    132 	 */
    133 	if ((fp = fdopen(s, "r")) != NULL)
    134 		while ((c = getc(fp)) != EOF) {
    135 			c &= 0x7f;
    136 			if (c == '\r') {
    137 				if (lastc == '\r')	/* ^M^M - skip dupes */
    138 					continue;
    139 				c = '\n';
    140 				lastc = '\r';
    141 			} else {
    142 				if (!isprint(c) && !isspace(c))
    143 					c |= 0x40;
    144 				if (lastc != '\r' || c != '\n')
    145 					lastc = c;
    146 				else {
    147 					lastc = '\n';
    148 					continue;
    149 				}
    150 			}
    151 			putchar(c);
    152 		}
    153 	if (lastc != '\n')
    154 		putchar('\n');
    155 	putchar('\n');
    156 	(void)fclose(fp);
    157 }
    158