Use off_t for file positions in comsat.
[dragonfly.git] / libexec / fingerd / fingerd.c
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1/*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
20 *
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
31 * SUCH DAMAGE.
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32 *
33 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)fingerd.c 8.1 (Berkeley) 6/4/93
35 * $FreeBSD: src/libexec/fingerd/fingerd.c,v 1.16.2.3 2002/04/03 09:05:23 mike Exp $
3eefb696 36 * $DragonFly: src/libexec/fingerd/fingerd.c,v 1.3 2003/11/14 03:54:29 dillon Exp $
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37 */
38
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39#include <sys/types.h>
40#include <sys/param.h>
41#include <sys/socket.h>
42#include <netinet/in.h>
43#include <netinet/tcp.h>
44#include <arpa/inet.h>
45#include <errno.h>
46
47#include <unistd.h>
48#include <syslog.h>
49#include <libutil.h>
50#include <netdb.h>
51#include <stdio.h>
52#include <stdlib.h>
53#include <strings.h>
54#include "pathnames.h"
55
3eefb696 56void logerr (const char *, ...);
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57
58int
59main(argc, argv)
60 int argc;
61 char *argv[];
62{
63 register FILE *fp;
64 register int ch;
65 register char *lp;
66 struct sockaddr_storage ss;
67 int p[2], logging, secure, sval;
68#define ENTRIES 50
69 char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog;
70 char rhost[MAXHOSTNAMELEN];
71
72 prog = _PATH_FINGER;
73 logging = secure = 0;
74 openlog("fingerd", LOG_PID | LOG_CONS, LOG_DAEMON);
75 opterr = 0;
76 while ((ch = getopt(argc, argv, "slp:")) != -1)
77 switch (ch) {
78 case 'l':
79 logging = 1;
80 break;
81 case 'p':
82 prog = optarg;
83 break;
84 case 's':
85 secure = 1;
86 break;
87 case '?':
88 default:
89 logerr("illegal option -- %c", optopt);
90 }
91
92 /*
93 * Enable server-side Transaction TCP.
94 */
95 {
96 int one = 1;
97 if (setsockopt(STDOUT_FILENO, IPPROTO_TCP, TCP_NOPUSH, &one,
98 sizeof one) < 0) {
99 logerr("setsockopt(TCP_NOPUSH) failed: %m");
100 }
101 }
102
103 if (!fgets(line, sizeof(line), stdin))
104 exit(1);
105
106 if (logging) {
107 char *t;
108 char *end;
109
110 end = memchr(line, 0, sizeof(line));
111 if (end == NULL) {
112 if ((t = malloc(sizeof(line) + 1)) == NULL)
113 logerr("malloc: %s", strerror(errno));
114 memcpy(t, line, sizeof(line));
115 t[sizeof(line)] = 0;
116 } else {
117 if ((t = strdup(line)) == NULL)
118 logerr("strdup: %s", strerror(errno));
119 }
120 for (end = t; *end; end++)
121 if (*end == '\n' || *end == '\r')
122 *end = ' ';
123 sval = sizeof(ss);
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';
129 syslog(LOG_NOTICE, "query from %s: `%s'", rhost, t);
130 }
131
132 comp = &av[1];
133 av[2] = "--";
134 for (lp = line, ap = &av[3];;) {
135 *ap = strtok(lp, " \t\r\n");
136 if (!*ap) {
137 if (secure && ap == &av[3]) {
138 puts("must provide username\r\n");
139 exit(1);
140 }
141 break;
142 }
143 if (secure && strchr(*ap, '@')) {
144 puts("forwarding service denied\r\n");
145 exit(1);
146 }
147
148 /* RFC742: "/[Ww]" == "-l" */
149 if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) {
150 av[1] = "-l";
151 comp = &av[0];
152 }
153 else if (++ap == av + ENTRIES) {
154 *ap = NULL;
155 break;
156 }
157 lp = NULL;
158 }
159
160 if (lp = strrchr(prog, '/'))
161 *comp = ++lp;
162 else
163 *comp = prog;
164 if (pipe(p) < 0)
165 logerr("pipe: %s", strerror(errno));
166
167 switch(vfork()) {
168 case 0:
169 (void)close(p[0]);
170 if (p[1] != 1) {
171 (void)dup2(p[1], 1);
172 (void)close(p[1]);
173 }
174 execv(prog, comp);
175 logerr("execv: %s: %s", prog, strerror(errno));
176 _exit(1);
177 case -1:
178 logerr("fork: %s", strerror(errno));
179 }
180 (void)close(p[1]);
181 if (!(fp = fdopen(p[0], "r")))
182 logerr("fdopen: %s", strerror(errno));
183 while ((ch = getc(fp)) != EOF) {
184 if (ch == '\n')
185 putchar('\r');
186 putchar(ch);
187 }
188 exit(0);
189}
190
191#if __STDC__
192#include <stdarg.h>
193#else
194#include <varargs.h>
195#endif
196
197void
198#if __STDC__
199logerr(const char *fmt, ...)
200#else
201logerr(fmt, va_alist)
202 char *fmt;
203 va_dcl
204#endif
205{
206 va_list ap;
207#if __STDC__
208 va_start(ap, fmt);
209#else
210 va_start(ap);
211#endif
212 (void)vsyslog(LOG_ERR, fmt, ap);
213 va_end(ap);
214 exit(1);
215 /* NOTREACHED */
216}