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- Committer: Bazaar Package Importer
- Author(s): Simon Kelley
- Date: 2005-09-30 02:21:51 UTC
- mfrom: (1.1.1 upstream)
- Revision ID: james.westby@ubuntu.com-20050930022151-vq3xlcazj0bdpyf4
Tags: 1:2.0.0-2
Clear out /etc/dhcpc/resolv.conf and /var/lib/dhcpc/*
during purge. (closes: #330515)
during purge. (closes: #330515)
added
removed
dhcpcd.c
1
/*
2
* dhcpcd - DHCP client daemon -
3
* Copyright (C) 1996 - 1997 Yoichi Hariguchi <yoichi@fore.com>
4
* Copyright (C) January, 1998 Sergei Viznyuk <sv@phystech.com>
5
*
6
* dhcpcd is an RFC2131 and RFC1541 compliant DHCP client daemon.
7
*
8
* This is free software; you can redistribute it and/or modify it
9
* under the terms of the GNU General Public License as published by
10
* the Free Software Foundation; either version 2 of the License, or
11
* (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16
* See the GNU General Public License for more details.
17
*
18
* You should have received a copy of the GNU General Public License
19
* along with this program; if not, write to the Free Software
20
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21
*/
22
23
#include <stdio.h>
24
#include <stdlib.h>
25
#include <string.h>
26
#include <syslog.h>
27
#include <unistd.h>
28
#include <fcntl.h>
29
#include <sys/stat.h>
30
#include <net/if.h>
31
#include <netinet/in.h>
32
#include <arpa/inet.h>
33
#include <errno.h>
34
#include <ctype.h>
35
#include "pathnames.h"
36
#include "client.h"
37
#include "signals.h"
38
#include "udpipgen.h"
39
40
struct in_addr inform_ipaddr,default_router;
41
char *ProgramName = NULL;
42
char **ProgramEnviron= NULL;
43
char *IfName = DEFAULT_IFNAME;
44
char *IfNameExt = DEFAULT_IFNAME;
45
int IfName_len = DEFAULT_IFNAME_LEN;
46
int IfNameExt_len = DEFAULT_IFNAME_LEN;
47
char *HostName = NULL;
48
int HostName_len = 0;
49
char *Cfilename = NULL;
50
unsigned char *ClassID = NULL;
51
int ClassID_len = 0;
52
unsigned char *ClientID = NULL;
53
int ClientID_len = 0;
54
void *(*currState)() = &dhcpReboot;
55
int DebugFlag = 0;
56
int BeRFC1541 = 0;
57
unsigned LeaseTime = DEFAULT_LEASETIME;
58
int ReplResolvConf = 1;
59
int ReplNISConf = 1;
60
int ReplNTPConf = 1;
61
int SetDomainName = 0;
62
int SetHostName = 0;
63
int BroadcastResp = 0;
64
time_t TimeOut = DEFAULT_TIMEOUT;
65
int magic_cookie = 0;
66
unsigned short dhcpMsgSize = 0;
67
unsigned nleaseTime = 0;
68
int DoCheckSum = 0;
69
int TestCase = 0;
70
int SendSecondDiscover = 0;
71
int Window = 0;
72
char *ConfigDir = CONFIG_DIR;
73
int SetDHCPDefaultRoutes= 1;
74
int Persistent = 0;
75
#if 0
76
unsigned char ClientMACaddr[ETH_ALEN];
77
int ClientMACaddr_ind = 0;
78
#endif
79
/*****************************************************************************/
80
void print_version()
81
{
82
fprintf(stderr,"\
83
DHCP Client Daemon v."VERSION"\n\
84
Copyright (C) 1996 - 1997 Yoichi Hariguchi <yoichi@fore.com>\n\
85
Copyright (C) January, 1998 Sergei Viznyuk <sv@phystech.com>\n\
86
Location: http://www.phystech.com/download/\n");
87
}
88
/*****************************************************************************/
89
void checkIfAlreadyRunning()
90
{
91
int o;
92
char pidfile[64];
93
snprintf(pidfile,sizeof(pidfile),PID_FILE_PATH,ConfigDir,IfNameExt);
94
o=open(pidfile,O_RDONLY);
95
if ( o == -1 ) return;
96
close(o);
97
fprintf(stderr,"\
98
**** %s: already running\n\
99
**** %s: if not then delete %s file\n",ProgramName,ProgramName,pidfile);
100
exit(1);
101
}
102
/*****************************************************************************/
103
int main(argn,argc,argv)
104
int argn;
105
char *argc[],*argv[];
106
{
107
int killFlag = 0;
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int versionFlag = 0;
109
int s = 1;
110
int k = 1;
111
int i = 1;
112
int j;
113
114
/*
115
* Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
116
* This way we can close 0, 1, 2 after forking the daemon without clobbering
117
* a fd that we are using (such as our sockets). This is necessary if
118
* this program is run from init scripts where 0, 1, and/or 2 may be closed.
119
*/
120
j=open("/dev/null",O_RDWR);
121
while ( j < 2 && j >= 0 ) j = dup(j);
122
if ( j > 2 ) close(j);
123
124
if ( geteuid() )
125
{
126
fprintf(stderr,"**** %s: not a superuser\n",argc[0]);
127
exit(1);
128
}
129
130
while ( argc[i] )
131
if ( argc[i][0]=='-' )
132
prgs: switch ( argc[i][s] )
133
{
134
case 0:
135
i++;
136
s=1;
137
break;
138
case 'p':
139
s++;
140
Persistent = 1;
141
goto prgs;
142
case 'k':
143
s++;
144
killFlag=SIGHUP;
145
goto prgs;
146
case 'n':
147
s++;
148
killFlag=SIGALRM;
149
goto prgs;
150
case 'd':
151
s++;
152
DebugFlag=1;
153
goto prgs;
154
case 'r':
155
s++;
156
BeRFC1541=1;
157
goto prgs;
158
case 'D':
159
s++;
160
SetDomainName=1;
161
goto prgs;
162
case 'H':
163
s++;
164
SetHostName=1;
165
goto prgs;
166
case 'R':
167
s++;
168
ReplResolvConf=0;
169
goto prgs;
170
case 'Y':
171
s++;
172
ReplNISConf=0;
173
goto prgs;
174
case 'N':
175
s++;
176
ReplNTPConf=0;
177
goto prgs;
178
case 'V':
179
s++;
180
versionFlag=1;
181
goto prgs;
182
case 'c':
183
if ( argc[i][s+1] ) goto usage;
184
i++;
185
Cfilename=argc[i++];
186
if ( Cfilename == NULL || Cfilename[0] == '-' ) goto usage;
187
s=1;
188
break;
189
case 'L':
190
if ( argc[i][s+1] ) goto usage;
191
i++;
192
ConfigDir=argc[i++];
193
if ( ConfigDir == NULL || ConfigDir[0] != '/' ) goto usage;
194
s=1;
195
break;
196
#if 0
197
case 'M':
198
if ( argc[i][s+1] ) goto usage;
199
i++;
200
if ( argc[i] == NULL ) goto usage;
201
if ( isxdigit(argc[i][0]) && isxdigit(argc[i][1]) && argc[i][2] == ':' )
202
ClientMACaddr[0] = 16*(argc[i][0]>64?(toupper(argc[i][0])-55):(argc[i][0]-48)) +
203
(argc[i][1]>64?(toupper(argc[i][1])-55):(argc[i][1]-48));
204
else
205
goto usage;
206
if ( isxdigit(argc[i][3]) && isxdigit(argc[i][4]) && argc[i][5] == ':' )
207
ClientMACaddr[1] = 16*(argc[i][3]>64?(toupper(argc[i][3])-55):(argc[i][3]-48)) +
208
(argc[i][4]>64?(toupper(argc[i][4])-55):(argc[i][4]-48));
209
else
210
goto usage;
211
if ( isxdigit(argc[i][6]) && isxdigit(argc[i][7]) && argc[i][8] == ':' )
212
ClientMACaddr[2] = 16*(argc[i][6]>64?(toupper(argc[i][6])-55):(argc[i][6]-48)) +
213
(argc[i][7]>64?(toupper(argc[i][7])-55):(argc[i][7]-48));
214
else
215
goto usage;
216
if ( isxdigit(argc[i][9]) && isxdigit(argc[i][10]) && argc[i][11] == ':' )
217
ClientMACaddr[3] = 16*(argc[i][9]>64?(toupper(argc[i][9])-55):(argc[i][9]-48)) +
218
(argc[i][10]>64?(toupper(argc[i][10])-55):(argc[i][10]-48));
219
else
220
goto usage;
221
if ( isxdigit(argc[i][12]) && isxdigit(argc[i][13]) && argc[i][14] == ':' )
222
ClientMACaddr[4] = 16*(argc[i][12]>64?(toupper(argc[i][12])-55):(argc[i][12]-48)) +
223
(argc[i][13]>64?(toupper(argc[i][13])-55):(argc[i][13]-48));
224
else
225
goto usage;
226
if ( isxdigit(argc[i][15]) && isxdigit(argc[i][16]) )
227
ClientMACaddr[5] = 16*(argc[i][15]>64?(toupper(argc[i][15])-55):(argc[i][15]-48)) +
228
(argc[i][16]>64?(toupper(argc[i][16])-55):(argc[i][16]-48));
229
else
230
goto usage;
231
s=1;
232
i++;
233
ClientMACaddr_ind=1;
234
break;
235
#endif
236
case 'i':
237
if ( argc[i][s+1] ) goto usage;
238
i++;
239
ClassID=argc[i++];
240
if ( ClassID == NULL || ClassID[0] == '-' ) goto usage;
241
s=1;
242
if ( (ClassID_len=strlen(ClassID)) < CLASS_ID_MAX_LEN+1 ) break;
243
fprintf(stderr,"**** %s: too long ClassID string: strlen=%d\n",
244
argc[0],ClassID_len);
245
goto usage;
246
case 'I':
247
if ( argc[i][s+1] ) goto usage;
248
i++;
249
ClientID=argc[i++];
250
if ( ClientID == NULL || ClientID[0] == '-' ) goto usage;
251
s=1;
252
if ( (ClientID_len=strlen(ClientID)) < CLIENT_ID_MAX_LEN+1 ) break;
253
fprintf(stderr,"**** %s: too long ClientID string: strlen=%d\n",
254
argc[0],ClientID_len);
255
goto usage;
256
case 'h':
257
if ( argc[i][s+1] ) goto usage;
258
i++;
259
HostName=argc[i++];
260
if ( HostName == NULL || HostName[0] == '-' ) goto usage;
261
s=1;
262
if ( (HostName_len=strlen(HostName)+1) < HOSTNAME_MAX_LEN ) break;
263
fprintf(stderr,"**** %s: too long HostName string: strlen=%d\n",
264
argc[0],HostName_len);
265
break;
266
case 't':
267
if ( argc[i][s+1] ) goto usage;
268
i++;
269
if ( argc[i] )
270
TimeOut=atol(argc[i++]);
271
else
272
goto usage;
273
s=1;
274
if ( TimeOut >= 0 ) break;
275
goto usage;
276
case 'w':
277
if ( argc[i][s+1] ) goto usage;
278
i++;
279
if ( argc[i] )
280
Window=atol(argc[i++]);
281
else
282
goto usage;
283
s=1;
284
if ( Window >= 0 ) break;
285
goto usage;
286
case 's':
287
if ( argc[i][s+1] ) goto usage;
288
i++;
289
if ( argc[i] && inet_aton(argc[i],&inform_ipaddr) )
290
i++;
291
else
292
memset(&inform_ipaddr,0,sizeof(inform_ipaddr));
293
currState = &dhcpInform;
294
s=1;
295
break;
296
case 'G':
297
if ( argc[i][s+1] ) goto usage;
298
SetDHCPDefaultRoutes=0;
299
i++;
300
if ( argc[i] && inet_aton(argc[i],&default_router) )
301
i++;
302
else
303
memset(&default_router,0,sizeof(default_router));
304
s=1;
305
break;
306
case 'B':
307
s++;
308
BroadcastResp=1;
309
goto prgs;
310
case 'C':
311
s++;
312
DoCheckSum=1;
313
goto prgs;
314
case 'T':
315
s++;
316
TestCase=1;
317
goto prgs;
318
case 'S':
319
s++;
320
SendSecondDiscover=1;
321
goto prgs;
322
case 'l':
323
if ( argc[i][s+1] ) goto usage;
324
i++;
325
if ( argc[i] )
326
LeaseTime=atol(argc[i++]);
327
else
328
goto usage;
329
s=1;
330
if ( LeaseTime > 0 ) break;
331
default:
332
usage: print_version();
333
fprintf(stderr,
334
"Usage: dhcpcd [-dknprBCDHNRSTY] [-l leasetime] [-h hostname] [-t timeout]\n\
335
[-i vendorClassID] [-I ClientID] [-c filename] [-s [ipaddr]]\n\
336
[-w windowsize] [-L ConfigDir] [-G [gateway]] [interface]\n");
337
exit(1);
338
}
339
else
340
argc[k++]=argc[i++];
341
if ( k > 1 )
342
{
343
if ( (IfNameExt_len=strlen(argc[1])) > IFNAMSIZ ) goto usage;
344
IfNameExt=argc[1];
345
IfName=IfNameExt;
346
IfName_len=IfNameExt_len;
347
s=0;
348
while ( IfNameExt[s] )
349
if ( IfNameExt[s] == ':' )
350
{
351
IfName=(char *)malloc(s+1);
352
memcpy(IfName,IfNameExt,s);
353
IfName[s]=0;
354
IfName_len=s;
355
break;
356
}
357
else
358
s++;
359
}
360
ProgramName=argc[0];
361
ProgramEnviron=argv;
362
umask(022);
363
if ( killFlag ) killPid(killFlag);
364
if ( ! TestCase ) checkIfAlreadyRunning();
365
if ( versionFlag ) print_version();
366
openlog(PROGRAM_NAME,LOG_PID|(DebugFlag?LOG_CONS:0),LOG_LOCAL0);
367
signalSetup();
368
if ( mkdir(ConfigDir,S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) && errno != EEXIST )
369
{
370
syslog(LOG_ERR,"mkdir(\"%s\",0): %m\n",ConfigDir);
371
exit(1);
372
}
373
magic_cookie = htonl(MAGIC_COOKIE);
374
dhcpMsgSize = htons(sizeof(dhcpMessage)+sizeof(udpiphdr));
375
nleaseTime = htonl(LeaseTime);
376
if (TimeOut != 0)
377
alarm(TimeOut);
378
do
379
if ( (currState=(void *(*)())currState()) == NULL ) exit(1);
380
while ( currState != &dhcpBound );
381
#if 0
382
if ( TestCase ) exit(0);
383
#endif
384
alarm(0);
385
#ifdef DEBUG
386
writePidFile(getpid());
387
#else
388
#ifdef EMBED
389
s=vfork();
390
#else
391
s=fork();
392
#endif
393
if ( s )
394
{
395
writePidFile(s);
396
exit(0); /* got into bound state. */
397
}
398
setsid();
399
if ( (i=open("/dev/null",O_RDWR,0)) >= 0 )
400
{
401
(void)dup2(i,STDIN_FILENO);
402
(void)dup2(i,STDOUT_FILENO);
403
(void)dup2(i,STDERR_FILENO);
404
if ( i > 2 ) (void)close(i);
405
}
406
#endif
407
chdir("/");
408
do currState=(void *(*)())currState(); while ( currState );
409
deletePidFile();
410
exit(1);
411
}
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