2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 static const char copyright[] =
36 "@(#) Copyright (c) 1983, 1993\n\
37 The Regents of the University of California. All rights reserved.\n";
42 static char sccsid[] = "@(#)fingerd.c 8.1 (Berkeley) 6/4/93";
44 static const char rcsid[] =
48 #include <sys/types.h>
49 #include <sys/param.h>
50 #include <sys/socket.h>
51 #include <netinet/in.h>
52 #include <netinet/tcp.h>
53 #include <arpa/inet.h>
63 #include "pathnames.h"
65 void logerr(const char *, ...) __printflike(1, 2);
68 main(int argc, char *argv[])
73 struct sockaddr_storage ss;
75 int p[2], logging, pflag, secure;
77 char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog;
78 char rhost[MAXHOSTNAMELEN];
81 logging = pflag = secure = 0;
82 openlog("fingerd", LOG_PID | LOG_CONS, LOG_DAEMON);
84 while ((ch = getopt(argc, argv, "lp:s")) != -1)
98 logerr("illegal option -- %c", optopt);
102 * Enable server-side Transaction TCP.
106 if (setsockopt(STDOUT_FILENO, IPPROTO_TCP, TCP_NOPUSH, &one,
108 logerr("setsockopt(TCP_NOPUSH) failed: %m");
112 if (!fgets(line, sizeof(line), stdin))
115 if (logging || pflag) {
117 if (getpeername(0, (struct sockaddr *)&ss, &sval) < 0)
118 logerr("getpeername: %s", strerror(errno));
119 realhostname_sa(rhost, sizeof rhost - 1,
120 (struct sockaddr *)&ss, sval);
121 rhost[sizeof(rhost) - 1] = '\0';
123 setenv("FINGERD_REMOTE_HOST", rhost, 1);
130 end = memchr(line, 0, sizeof(line));
132 if ((t = malloc(sizeof(line) + 1)) == NULL)
133 logerr("malloc: %s", strerror(errno));
134 memcpy(t, line, sizeof(line));
137 if ((t = strdup(line)) == NULL)
138 logerr("strdup: %s", strerror(errno));
140 for (end = t; *end; end++)
141 if (*end == '\n' || *end == '\r')
143 syslog(LOG_NOTICE, "query from %s: `%s'", rhost, t);
148 for (lp = line, ap = &av[3];;) {
149 *ap = strtok(lp, " \t\r\n");
151 if (secure && ap == &av[3]) {
152 puts("must provide username\r\n");
157 if (secure && strchr(*ap, '@')) {
158 puts("forwarding service denied\r\n");
162 /* RFC742: "/[Ww]" == "-l" */
163 if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) {
167 else if (++ap == av + ENTRIES) {
174 if ((lp = strrchr(prog, '/')) != NULL)
179 logerr("pipe: %s", strerror(errno));
184 if (p[1] != STDOUT_FILENO) {
185 (void)dup2(p[1], STDOUT_FILENO);
188 dup2(STDOUT_FILENO, STDERR_FILENO);
191 write(STDERR_FILENO, prog, strlen(prog));
192 #define MSG ": cannot execute\n"
193 write(STDERR_FILENO, MSG, strlen(MSG));
197 logerr("fork: %s", strerror(errno));
200 if (!(fp = fdopen(p[0], "r")))
201 logerr("fdopen: %s", strerror(errno));
202 while ((ch = getc(fp)) != EOF) {
213 logerr(const char *fmt, ...)
217 (void)vsyslog(LOG_ERR, fmt, ap);