net.c revision 1590 
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
37#ifndef lint
38static char sccsid[] = "@(#)net.c	8.3 (Berkeley) 1/2/94";
39#endif /* not lint */
40
41#include <sys/types.h>
42#include <sys/socket.h>
43#include <netinet/in.h>
44#include <arpa/inet.h>
45#include <netdb.h>
46#include <db.h>
47#include <unistd.h>
48#include <pwd.h>
49#include <utmp.h>
50#include <stdio.h>
51#include <ctype.h>
52#include <string.h>
53#include "finger.h"
54
55void
56netfinger(name)
57	char *name;
58{
59	extern int lflag;
60	register FILE *fp;
61	register int c, lastc;
62	struct in_addr defaddr;
63	struct hostent *hp, def;
64	struct servent *sp;
65	struct sockaddr_in sin;
66	int s;
67	char *alist[1], *host;
68
69	if (!(host = rindex(name, '@')))
70		return;
71	*host++ = NULL;
72	if (isdigit(*host) && (defaddr.s_addr = inet_addr(host)) != -1) {
73		def.h_name = host;
74		def.h_addr_list = alist;
75		def.h_addr = (char *)&defaddr;
76		def.h_length = sizeof(struct in_addr);
77		def.h_addrtype = AF_INET;
78		def.h_aliases = 0;
79		hp = &def;
80	} else if (!(hp = gethostbyname(host))) {
81		(void)fprintf(stderr,
82		    "finger: unknown host: %s\n", host);
83		return;
84	}
85	if (!(sp = getservbyname("finger", "tcp"))) {
86		(void)fprintf(stderr, "finger: tcp/finger: unknown service\n");
87		return;
88	}
89	sin.sin_family = hp->h_addrtype;
90	bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
91	sin.sin_port = sp->s_port;
92	if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) {
93		perror("finger: socket");
94		return;
95	}
96
97	/* have network connection; identify the host connected with */
98	(void)printf("[%s]\n", hp->h_name);
99	if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
100		perror("finger: connect");
101		(void)close(s);
102		return;
103	}
104
105	/* -l flag for remote fingerd  */
106	if (lflag)
107		write(s, "/W ", 3);
108	/* send the name followed by <CR><LF> */
109	(void)write(s, name, strlen(name));
110	(void)write(s, "\r\n", 2);
111
112	/*
113	 * Read from the remote system; once we're connected, we assume some
114	 * data.  If none arrives, we hang until the user interrupts.
115	 *
116	 * If we see a <CR> or a <CR> with the high bit set, treat it as
117	 * a newline; if followed by a newline character, only output one
118	 * newline.
119	 *
120	 * Otherwise, all high bits are stripped; if it isn't printable and
121	 * it isn't a space, we can simply set the 7th bit.  Every ASCII
122	 * character with bit 7 set is printable.
123	 */
124	if (fp = fdopen(s, "r"))
125		while ((c = getc(fp)) != EOF) {
126			c &= 0x7f;
127			if (c == 0x0d) {
128				if (lastc == '\r')	/* ^M^M - skip dupes */
129					continue;
130				c = '\n';
131				lastc = '\r';
132			} else {
133				if (!isprint(c) && !isspace(c))
134					c |= 0x40;
135				if (lastc != '\r' || c != '\n')
136					lastc = c;
137				else {
138					lastc = '\n';
139					continue;
140				}
141			}
142			putchar(c);
143		}
144	if (lastc != '\n')
145		putchar('\n');
146	putchar('\n');
147	(void)fclose(fp);
148}
149