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
35 static 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
57 static void cleanup(int sig);
58 static int do_protocol(const char *name, const struct addrinfo *ai);
59 static void trying(const struct addrinfo *ai);
60
61 void
netfinger(char * name)62 netfinger(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
106 static int
do_protocol(const char * name,const struct addrinfo * ai)107 do_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
217 static void
trying(const struct addrinfo * ai)218 trying(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
229 static void
cleanup(int sig __unused)230 cleanup(int sig __unused)
231 {
232 #define ERRSTR "Timed out.\n"
233 write(STDERR_FILENO, ERRSTR, sizeof ERRSTR);
234 exit(1);
235 }
236
237