2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/param.h>
36 #include <sys/socket.h>
51 static void cleanup(int sig);
52 static int do_protocol(const char *name, const struct addrinfo *ai);
53 static void trying(const struct addrinfo *ai);
60 struct addrinfo *ai, *ai0;
61 static struct addrinfo hint;
63 host = strrchr(name, '@');
67 signal(SIGALRM, cleanup);
70 hint.ai_flags = AI_CANONNAME;
71 hint.ai_family = family;
72 hint.ai_socktype = SOCK_STREAM;
74 error = getaddrinfo(host, "finger", &hint, &ai0);
76 warnx("%s: %s", host, gai_strerror(error));
80 multi = (ai0->ai_next) != 0;
82 /* ai_canonname may not be filled in if the user specified an IP. */
83 if (ai0->ai_canonname == 0)
84 printf("[%s]\n", host);
86 printf("[%s]\n", ai0->ai_canonname);
88 for (ai = ai0; ai != NULL; ai = ai->ai_next) {
92 error = do_protocol(name, ai);
101 do_protocol(const char *name, const struct addrinfo *ai)
103 int cnt, line_len, s;
108 static char slash_w[] = "/W ";
109 static char neteol[] = "\r\n";
111 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
113 warn("socket(%d, %d, %d)", ai->ai_family, ai->ai_socktype,
118 msg.msg_name = (void *)ai->ai_addr;
119 msg.msg_namelen = ai->ai_addrlen;
123 msg.msg_controllen = 0;
126 /* -l flag for remote fingerd */
128 iov[msg.msg_iovlen].iov_base = slash_w;
129 iov[msg.msg_iovlen++].iov_len = 3;
131 /* send the name followed by <CR><LF> */
132 iov[msg.msg_iovlen].iov_base = strdup(name);
133 iov[msg.msg_iovlen++].iov_len = strlen(name);
134 iov[msg.msg_iovlen].iov_base = neteol;
135 iov[msg.msg_iovlen++].iov_len = 2;
137 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
143 if (sendmsg(s, &msg, 0) < 0) {
150 * Read from the remote system; once we're connected, we assume some
151 * data. If none arrives, we hang until the user interrupts.
153 * If we see a <CR> or a <CR> with the high bit set, treat it as
154 * a newline; if followed by a newline character, only output one
157 * Otherwise, all high bits are stripped; if it isn't printable and
158 * it isn't a space, we can simply set the 7th bit. Every ASCII
159 * character with bit 7 set is printable.
162 if ((fp = fdopen(s, "r")) != NULL) {
165 while ((c = getwc(fp)) != EOF) {
166 if (++cnt > OUTPUT_MAX) {
167 printf("\n\n Output truncated at %d bytes...\n",
172 if (lastc == '\r') /* ^M^M - skip dupes */
177 if (!iswprint(c) && !iswspace(c)) {
181 if (lastc != '\r' || c != '\n')
189 if (c != '\n' && ++line_len > _POSIX2_LINE_MAX) {
194 if (lastc == '\n' || lastc == '\r')
199 * Assume that whatever it was set errno...
201 warn("reading from network");
212 trying(const struct addrinfo *ai)
214 char buf[NI_MAXHOST];
216 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof buf,
217 (char *)0, 0, NI_NUMERICHOST) != 0)
218 return; /* XXX can't happen */
220 printf("Trying %s...\n", buf);
224 cleanup(int sig __unused)
226 #define ERRSTR "Timed out.\n"
227 write(STDERR_FILENO, ERRSTR, sizeof ERRSTR);