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 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if 0
34#ifndef lint
35static char sccsid[] = "@(#)net.c	8.4 (Berkeley) 4/28/95";
36#endif
37#endif
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD$");
41
42#include <sys/param.h>
43#include <sys/socket.h>
44#include <sys/uio.h>
45#include <ctype.h>
46#include <db.h>
47#include <err.h>
48#include <netdb.h>
49#include <pwd.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54#include <utmpx.h>
55#include "finger.h"
56
57static void cleanup(int sig);
58static int do_protocol(const char *name, const struct addrinfo *ai);
59static void trying(const struct addrinfo *ai);
60
61void
62netfinger(char *name)
63{
64	int error, multi;
65	char *host;
66	struct addrinfo *ai, *ai0;
67	static struct addrinfo hint;
68
69	host = strrchr(name, '@');
70	if (host == 0)
71		return;
72	*host++ = '\0';
73	signal(SIGALRM, cleanup);
74	alarm(TIME_LIMIT);
75
76	hint.ai_flags = AI_CANONNAME;
77	hint.ai_family = family;
78	hint.ai_socktype = SOCK_STREAM;
79
80	error = getaddrinfo(host, "finger", &hint, &ai0);
81	if (error) {
82		warnx("%s: %s", host, gai_strerror(error));
83		return;
84	}
85
86	multi = (ai0->ai_next) != 0;
87
88	/* ai_canonname may not be filled in if the user specified an IP. */
89	if (ai0->ai_canonname == 0)
90		printf("[%s]\n", host);
91	else
92		printf("[%s]\n", ai0->ai_canonname);
93
94	for (ai = ai0; ai != 0; ai = ai->ai_next) {
95		if (multi)
96			trying(ai);
97
98		error = do_protocol(name, ai);
99		if (!error)
100			break;
101	}
102	alarm(0);
103	freeaddrinfo(ai0);
104}
105
106static int
107do_protocol(const char *name, const struct addrinfo *ai)
108{
109	int cnt, line_len, s;
110	FILE *fp;
111	int c, lastc;
112	struct iovec iov[3];
113	struct msghdr msg;
114	static char slash_w[] = "/W ";
115	static char neteol[] = "\r\n";
116
117	s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
118	if (s < 0) {
119		warn("socket(%d, %d, %d)", ai->ai_family, ai->ai_socktype,
120		     ai->ai_protocol);
121		return -1;
122	}
123
124	msg.msg_name = (void *)ai->ai_addr;
125	msg.msg_namelen = ai->ai_addrlen;
126	msg.msg_iov = iov;
127	msg.msg_iovlen = 0;
128	msg.msg_control = 0;
129	msg.msg_controllen = 0;
130	msg.msg_flags = 0;
131
132	/* -l flag for remote fingerd  */
133	if (lflag) {
134		iov[msg.msg_iovlen].iov_base = slash_w;
135		iov[msg.msg_iovlen++].iov_len = 3;
136	}
137	/* send the name followed by <CR><LF> */
138	iov[msg.msg_iovlen].iov_base = strdup(name);
139	iov[msg.msg_iovlen++].iov_len = strlen(name);
140	iov[msg.msg_iovlen].iov_base = neteol;
141	iov[msg.msg_iovlen++].iov_len = 2;
142
143	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
144		warn("connect");
145		close(s);
146		return -1;
147	}
148
149	if (sendmsg(s, &msg, 0) < 0) {
150		warn("sendmsg");
151		close(s);
152		return -1;
153	}
154
155	/*
156	 * Read from the remote system; once we're connected, we assume some
157	 * data.  If none arrives, we hang until the user interrupts.
158	 *
159	 * If we see a <CR> or a <CR> with the high bit set, treat it as
160	 * a newline; if followed by a newline character, only output one
161	 * newline.
162	 *
163	 * Otherwise, all high bits are stripped; if it isn't printable and
164	 * it isn't a space, we can simply set the 7th bit.  Every ASCII
165	 * character with bit 7 set is printable.
166	 */
167	lastc = 0;
168	if ((fp = fdopen(s, "r")) != NULL) {
169		cnt = 0;
170		line_len = 0;
171		while ((c = getc(fp)) != EOF) {
172			if (++cnt > OUTPUT_MAX) {
173				printf("\n\n Output truncated at %d bytes...\n",
174					cnt - 1);
175				break;
176			}
177			if (c == 0x0d) {
178				if (lastc == '\r')	/* ^M^M - skip dupes */
179					continue;
180				c = '\n';
181				lastc = '\r';
182			} else {
183				if (!isprint(c) && !isspace(c)) {
184					c &= 0x7f;
185					c |= 0x40;
186				}
187				if (lastc != '\r' || c != '\n')
188					lastc = c;
189				else {
190					lastc = '\n';
191					continue;
192				}
193			}
194			putchar(c);
195			if (c != '\n' && ++line_len > _POSIX2_LINE_MAX) {
196				putchar('\\');
197				putchar('\n');
198				lastc = '\r';
199			}
200			if (lastc == '\n' || lastc == '\r')
201				line_len = 0;
202		}
203		if (ferror(fp)) {
204			/*
205			 * Assume that whatever it was set errno...
206			 */
207			warn("reading from network");
208		}
209		if (lastc != '\n')
210			putchar('\n');
211
212		fclose(fp);
213	}
214	return 0;
215}
216
217static void
218trying(const struct addrinfo *ai)
219{
220	char buf[NI_MAXHOST];
221
222	if (getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof buf,
223			(char *)0, 0, NI_NUMERICHOST) != 0)
224		return;		/* XXX can't happen */
225
226	printf("Trying %s...\n", buf);
227}
228
229static void
230cleanup(int sig __unused)
231{
232#define	ERRSTR	"Timed out.\n"
233	write(STDERR_FILENO, ERRSTR, sizeof ERRSTR);
234	exit(1);
235}
236
237