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 <wctype.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 <wchar.h>
56#include "finger.h"
57
58static void cleanup(int sig);
59static int do_protocol(const char *name, const struct addrinfo *ai);
60static void trying(const struct addrinfo *ai);
61
62void
63netfinger(char *name)
64{
65	int error, multi;
66	char *host;
67	struct addrinfo *ai, *ai0;
68	static struct addrinfo hint;
69
70	host = strrchr(name, '@');
71	if (host == NULL)
72		return;
73	*host++ = '\0';
74	signal(SIGALRM, cleanup);
75	alarm(TIME_LIMIT);
76
77	hint.ai_flags = AI_CANONNAME;
78	hint.ai_family = family;
79	hint.ai_socktype = SOCK_STREAM;
80
81	error = getaddrinfo(host, "finger", &hint, &ai0);
82	if (error) {
83		warnx("%s: %s", host, gai_strerror(error));
84		return;
85	}
86
87	multi = (ai0->ai_next) != 0;
88
89	/* ai_canonname may not be filled in if the user specified an IP. */
90	if (ai0->ai_canonname == 0)
91		printf("[%s]\n", host);
92	else
93		printf("[%s]\n", ai0->ai_canonname);
94
95	for (ai = ai0; ai != NULL; ai = ai->ai_next) {
96		if (multi)
97			trying(ai);
98
99		error = do_protocol(name, ai);
100		if (!error)
101			break;
102	}
103	alarm(0);
104	freeaddrinfo(ai0);
105}
106
107static int
108do_protocol(const char *name, const struct addrinfo *ai)
109{
110	int cnt, line_len, s;
111	FILE *fp;
112	wint_t c, lastc;
113	struct iovec iov[3];
114	struct msghdr msg;
115	static char slash_w[] = "/W ";
116	static char neteol[] = "\r\n";
117
118	s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
119	if (s < 0) {
120		warn("socket(%d, %d, %d)", ai->ai_family, ai->ai_socktype,
121		     ai->ai_protocol);
122		return -1;
123	}
124
125	msg.msg_name = (void *)ai->ai_addr;
126	msg.msg_namelen = ai->ai_addrlen;
127	msg.msg_iov = iov;
128	msg.msg_iovlen = 0;
129	msg.msg_control = 0;
130	msg.msg_controllen = 0;
131	msg.msg_flags = 0;
132
133	/* -l flag for remote fingerd  */
134	if (lflag) {
135		iov[msg.msg_iovlen].iov_base = slash_w;
136		iov[msg.msg_iovlen++].iov_len = 3;
137	}
138	/* send the name followed by <CR><LF> */
139	iov[msg.msg_iovlen].iov_base = strdup(name);
140	iov[msg.msg_iovlen++].iov_len = strlen(name);
141	iov[msg.msg_iovlen].iov_base = neteol;
142	iov[msg.msg_iovlen++].iov_len = 2;
143
144	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
145		warn("connect");
146		close(s);
147		return -1;
148	}
149
150	if (sendmsg(s, &msg, 0) < 0) {
151		warn("sendmsg");
152		close(s);
153		return -1;
154	}
155
156	/*
157	 * Read from the remote system; once we're connected, we assume some
158	 * data.  If none arrives, we hang until the user interrupts.
159	 *
160	 * If we see a <CR> or a <CR> with the high bit set, treat it as
161	 * a newline; if followed by a newline character, only output one
162	 * newline.
163	 *
164	 * Otherwise, all high bits are stripped; if it isn't printable and
165	 * it isn't a space, we can simply set the 7th bit.  Every ASCII
166	 * character with bit 7 set is printable.
167	 */
168	lastc = 0;
169	if ((fp = fdopen(s, "r")) != NULL) {
170		cnt = 0;
171		line_len = 0;
172		while ((c = getwc(fp)) != EOF) {
173			if (++cnt > OUTPUT_MAX) {
174				printf("\n\n Output truncated at %d bytes...\n",
175					cnt - 1);
176				break;
177			}
178			if (c == 0x0d) {
179				if (lastc == '\r')	/* ^M^M - skip dupes */
180					continue;
181				c = '\n';
182				lastc = '\r';
183			} else {
184				if (!iswprint(c) && !iswspace(c)) {
185					c &= 0x7f;
186					c |= 0x40;
187				}
188				if (lastc != '\r' || c != '\n')
189					lastc = c;
190				else {
191					lastc = '\n';
192					continue;
193				}
194			}
195			putwchar(c);
196			if (c != '\n' && ++line_len > _POSIX2_LINE_MAX) {
197				putchar('\\');
198				putchar('\n');
199				lastc = '\r';
200			}
201			if (lastc == '\n' || lastc == '\r')
202				line_len = 0;
203		}
204		if (ferror(fp)) {
205			/*
206			 * Assume that whatever it was set errno...
207			 */
208			warn("reading from network");
209		}
210		if (lastc != L'\n')
211			putchar('\n');
212
213		fclose(fp);
214	}
215	return 0;
216}
217
218static void
219trying(const struct addrinfo *ai)
220{
221	char buf[NI_MAXHOST];
222
223	if (getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof buf,
224			(char *)0, 0, NI_NUMERICHOST) != 0)
225		return;		/* XXX can't happen */
226
227	printf("Trying %s...\n", buf);
228}
229
230static void
231cleanup(int sig __unused)
232{
233#define	ERRSTR	"Timed out.\n"
234	write(STDERR_FILENO, ERRSTR, sizeof ERRSTR);
235	exit(1);
236}
237
238