2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 static const char copyright[] =
34 "@(#) Copyright (c) 1983, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
40 static char sccsid[] = "@(#)fingerd.c 8.1 (Berkeley) 6/4/93";
42 static const char rcsid[] =
46 #include <sys/types.h>
47 #include <sys/param.h>
48 #include <sys/socket.h>
49 #include <netinet/in.h>
50 #include <netinet/tcp.h>
51 #include <arpa/inet.h>
61 #include "pathnames.h"
63 #include <blacklist.h>
66 void logerr(const char *, ...) __printflike(1, 2) __dead2;
69 main(int argc, char *argv[])
74 struct sockaddr_storage ss;
76 int p[2], debug, kflag, logging, pflag, secure;
78 char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog;
79 char rhost[MAXHOSTNAMELEN];
82 debug = logging = kflag = pflag = secure = 0;
83 openlog("fingerd", LOG_PID | LOG_CONS, LOG_DAEMON);
85 while ((ch = getopt(argc, argv, "dklp:s")) != -1)
105 logerr("illegal option -- %c", optopt);
109 * Enable server-side Transaction TCP.
113 if (setsockopt(STDOUT_FILENO, IPPROTO_TCP, TCP_NOPUSH, &one,
115 logerr("setsockopt(TCP_NOPUSH) failed: %m");
119 if (!fgets(line, sizeof(line), stdin))
122 if (!debug && (logging || pflag)) {
124 if (getpeername(0, (struct sockaddr *)&ss, &sval) < 0)
125 logerr("getpeername: %s", strerror(errno));
126 realhostname_sa(rhost, sizeof rhost - 1,
127 (struct sockaddr *)&ss, sval);
128 rhost[sizeof(rhost) - 1] = '\0';
130 setenv("FINGERD_REMOTE_HOST", rhost, 1);
137 end = memchr(line, 0, sizeof(line));
139 if ((t = malloc(sizeof(line) + 1)) == NULL)
140 logerr("malloc: %s", strerror(errno));
141 memcpy(t, line, sizeof(line));
144 if ((t = strdup(line)) == NULL)
145 logerr("strdup: %s", strerror(errno));
147 for (end = t; *end; end++)
148 if (*end == '\n' || *end == '\r')
150 syslog(LOG_NOTICE, "query from %s: `%s'", rhost, t);
157 for (lp = line, ap = &av[4];;) {
158 *ap = strtok(lp, " \t\r\n");
160 if (secure && ap == &av[4]) {
162 blacklist(1, STDIN_FILENO, "nousername");
164 puts("must provide username\r\n");
169 if (secure && strchr(*ap, '@')) {
171 blacklist(1, STDIN_FILENO, "noforwarding");
173 puts("forwarding service denied\r\n");
177 /* RFC742: "/[Ww]" == "-l" */
178 if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) {
181 else if (++ap == av + ENTRIES) {
188 if ((lp = strrchr(prog, '/')) != NULL)
193 logerr("pipe: %s", strerror(errno));
196 fprintf(stderr, "%s", prog);
197 for (ap = comp; *ap != NULL; ++ap)
198 fprintf(stderr, " %s", *ap);
199 fprintf(stderr, "\n");
205 if (p[1] != STDOUT_FILENO) {
206 (void)dup2(p[1], STDOUT_FILENO);
209 dup2(STDOUT_FILENO, STDERR_FILENO);
212 blacklist(0, STDIN_FILENO, "success");
215 write(STDERR_FILENO, prog, strlen(prog));
216 #define MSG ": cannot execute\n"
217 write(STDERR_FILENO, MSG, strlen(MSG));
221 logerr("fork: %s", strerror(errno));
224 if (!(fp = fdopen(p[0], "r")))
225 logerr("fdopen: %s", strerror(errno));
226 while ((ch = getc(fp)) != EOF) {
237 logerr(const char *fmt, ...)
241 (void)vsyslog(LOG_ERR, fmt, ap);