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net.c revision 1.15 
      1 /*	$NetBSD: net.c,v 1.15 2002/08/02 00:10:40 christos 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 1.15 2002/08/02 00:10:40 christos 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 <time.h>
     57 #include <db.h>
     58 #include <unistd.h>
     59 #include <pwd.h>
     60 #include <stdio.h>
     61 #include <string.h>
     62 #include <ctype.h>
     63 #include <unistd.h>
     64 #include <err.h>
     65 
     66 #include "utmpentry.h"
     67 
     68 #include "finger.h"
     69 #include "extern.h"
     70 
     71 void
     72 netfinger(name)
     73 	char *name;
     74 {
     75 	FILE *fp;
     76 	int c, lastc;
     77 	int s;
     78 	char *host;
     79 	struct addrinfo hints, *res, *res0;
     80 	int error;
     81 	char *emsg = NULL;
     82 
     83 	lastc = 0;
     84 	if (!(host = strrchr(name, '@')))
     85 		return;
     86 	*host++ = '\0';
     87 	memset(&hints, 0, sizeof(hints));
     88 	hints.ai_family = PF_UNSPEC;
     89 	hints.ai_socktype = SOCK_STREAM;
     90 	hints.ai_flags = AI_CANONNAME;
     91 	error = getaddrinfo(host, "finger", &hints, &res0);
     92 	if (error) {
     93 		warnx("%s: %s", gai_strerror(error), host);
     94 		return;
     95 	}
     96 
     97 	s = -1;
     98 	for (res = res0; res; res = res->ai_next) {
     99 		s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
    100 		if (s < 0) {
    101 			emsg = "socket";
    102 			continue;
    103 		}
    104 
    105 		if (connect(s, res->ai_addr, res->ai_addrlen)) {
    106 			close(s);
    107 			s = -1;
    108 			emsg = "connect";
    109 			continue;
    110 		}
    111 
    112 		break;
    113 	}
    114 	if (s < 0) {
    115 		if (emsg != NULL)
    116 			warn("%s", emsg);
    117 		return;
    118 	}
    119 
    120 	/* have network connection; identify the host connected with */
    121 	(void)printf("[%s]\n", res0->ai_canonname ? res0->ai_canonname : host);
    122 
    123 	/* -l flag for remote fingerd  */
    124 	if (lflag)
    125 		write(s, "/W ", 3);
    126 	/* send the name followed by <CR><LF> */
    127 	(void)write(s, name, strlen(name));
    128 	(void)write(s, "\r\n", 2);
    129 
    130 	/*
    131 	 * Read from the remote system; once we're connected, we assume some
    132 	 * data.  If none arrives, we hang until the user interrupts.
    133 	 *
    134 	 * If we see a <CR> or a <CR> with the high bit set, treat it as
    135 	 * a newline; if followed by a newline character, only output one
    136 	 * newline.
    137 	 *
    138 	 * Otherwise, all high bits are stripped; if it isn't printable and
    139 	 * it isn't a space, we can simply set the 7th bit.  Every ASCII
    140 	 * character with bit 7 set is printable.
    141 	 */
    142 	if ((fp = fdopen(s, "r")) != NULL)
    143 		while ((c = getc(fp)) != EOF) {
    144 			c &= 0x7f;
    145 			if (c == '\r') {
    146 				if (lastc == '\r')	/* ^M^M - skip dupes */
    147 					continue;
    148 				c = '\n';
    149 				lastc = '\r';
    150 			} else {
    151 				if (!isprint(c) && !isspace(c))
    152 					c |= 0x40;
    153 				if (lastc != '\r' || c != '\n')
    154 					lastc = c;
    155 				else {
    156 					lastc = '\n';
    157 					continue;
    158 				}
    159 			}
    160 			putchar(c);
    161 		}
    162 	if (lastc != '\n')
    163 		putchar('\n');
    164 	(void)fclose(fp);
    165 }
    166