1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
|
/* dhcpd.c
DHCP Server Daemon. */
/*
* Copyright (c) 1995, 1996 The Internet Software Consortium.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of The Internet Software Consortium nor the names
* of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This software has been written for the Internet Software Consortium
* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
* Enterprises. To learn more about the Internet Software Consortium,
* see ``http://www.vix.com/isc''. To learn more about Vixie
* Enterprises, see ``http://www.vix.com''.
*/
#ifndef lint
static char ocopyright[] =
"$Id: dhcpd.c,v 1.32 1996/09/02 21:16:55 mellon Exp $ Copyright 1995, 1996 The Internet Software Consortium.";
#endif
static char copyright[] =
"Copyright 1995, 1996 The Internet Software Consortium.";
static char arr [] = "All rights reserved.";
static char message [] = "Internet Software Consortium DHCPD $Name: $";
#include "dhcpd.h"
static void usage PROTO ((void));
TIME cur_time;
struct group root_group;
struct iaddr server_identifier;
int server_identifier_matched;
#ifdef USE_FALLBACK
struct interface_info fallback_interface;
#endif
u_int16_t server_port;
int log_priority;
#ifdef DEBUG
int log_perror = -1;
#else
int log_perror = 1;
#endif
char *path_dhcpd_conf = _PATH_DHCPD_CONF;
char *path_dhcpd_db = _PATH_DHCPD_DB;
char *path_dhcpd_pid = _PATH_DHCPD_PID;
int main (argc, argv, envp)
int argc;
char **argv, **envp;
{
int i, status;
struct servent *ent;
char *s;
#ifndef DEBUG
int pidfilewritten = 0;
int pid;
char pbuf [20];
int daemon = 1;
#else
int daemon = 0;
#endif
/* Initially, log errors to stderr as well as to syslogd. */
#ifdef SYSLOG_4_2
openlog ("dhcpd", LOG_NDELAY);
log_priority = DHCPD_LOG_FACILITY;
#else
openlog ("dhcpd", LOG_NDELAY, DHCPD_LOG_FACILITY);
#endif
#ifndef DEBUG
#ifndef SYSLOG_4_2
setlogmask (LOG_UPTO (LOG_INFO));
#endif
#endif
note (message);
note (copyright);
note (arr);
for (i = 1; i < argc; i++) {
if (!strcmp (argv [i], "-p")) {
if (++i == argc)
usage ();
for (s = argv [i]; *s; s++)
if (!isdigit (*s))
error ("%s: not a valid UDP port",
argv [i]);
status = atoi (argv [i]);
if (status < 1 || status > 65535)
error ("%s: not a valid UDP port",
argv [i]);
server_port = htons (status);
debug ("binding to user-specified port %d",
ntohs (server_port));
} else if (!strcmp (argv [i], "-f")) {
#ifndef DEBUG
daemon = 0;
#endif
} else if (!strcmp (argv [i], "-d")) {
daemon = 0;
log_perror = -1;
} else if (!strcmp (argv [i], "-cf")) {
if (++i == argc)
usage ();
path_dhcpd_conf = argv [i];
} else if (!strcmp (argv [i], "-lf")) {
if (++i == argc)
usage ();
path_dhcpd_db = argv [i];
} else if (argv [i][0] == '-') {
usage ();
} else {
struct interface_info *tmp =
((struct interface_info *)
dmalloc (sizeof *tmp, "get_interface_list"));
if (!tmp)
error ("Insufficient memory to %s %s",
"record interface", argv [i]);
memset (tmp, 0, sizeof *tmp);
strcpy (tmp -> name, argv [i]);
tmp -> next = interfaces;
tmp -> flags = INTERFACE_REQUESTED;
interfaces = tmp;
}
}
/* If we were requested to log to stdout on the command line,
keep doing so; otherwise, stop. */
if (log_perror == -1)
log_perror = 1;
else
log_perror = 0;
if (daemon) {
/* Become a daemon... */
if ((pid = fork ()) < 0)
error ("Can't fork daemon: %m");
else if (pid)
exit (0);
/* Become session leader and get pid... */
pid = setsid ();
}
#ifndef DEBUG
/* Read previous pid file. */
if ((i = open (path_dhcpd_pid, O_RDONLY)) >= 0) {
status = read (i, pbuf, (sizeof pbuf) - 1);
close (i);
pbuf [status] = 0;
pid = atoi (pbuf);
/* If the previous server process is not still running,
write a new pid file immediately. */
if (pid && kill (pid, 0) < 0) {
unlink (path_dhcpd_pid);
if ((i = open (path_dhcpd_pid,
O_WRONLY | O_CREAT, 0640)) >= 0) {
sprintf (pbuf, "%d\n", (int)getpid ());
write (i, pbuf, strlen (pbuf));
close (i);
pidfilewritten = 1;
}
}
}
#endif /* !DEBUG */
/* Default to the DHCP/BOOTP port. */
if (!server_port)
{
ent = getservbyname ("dhcp", "udp");
if (!ent)
server_port = htons (67);
else
server_port = ent -> s_port;
endservent ();
}
/* Get the current time... */
GET_TIME (&cur_time);
/* Read the dhcpd.conf file... */
if (!readconf ())
error ("Configuration file errors encountered -- exiting");
/* Start up the database... */
db_startup ();
/* Discover all the network interfaces and initialize them. */
discover_interfaces ();
#ifndef DEBUG
/* If we didn't write the pid file earlier because we found a
process running the logged pid, but we made it to here,
meaning nothing is listening on the bootp port, then write
the pid file out - what's in it now is bogus anyway. */
if (!pidfilewritten) {
unlink (path_dhcpd_pid);
if ((i = open (path_dhcpd_pid,
O_WRONLY | O_CREAT, 0640)) >= 0) {
sprintf (pbuf, "%d\n", (int)getpid ());
write (i, pbuf, strlen (pbuf));
close (i);
pidfilewritten = 1;
}
}
#endif /* !DEBUG */
/* Receive packets and dispatch them... */
dispatch ();
/* Not reached */
return 0;
}
/* Print usage message. */
static void usage ()
{
error ("Usage: dhcpd [-p <UDP port #>] [-d] [-f] [-cf config-file]%s",
"\n [-l lease-file] [if0 [...ifN]]");
}
void cleanup ()
{
}
|
