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
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
|
/*
* PPP IP Control Protocol (IPCP) Module
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the Internet Initiative Japan, Inc. The name of the
* IIJ may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: ipcp.c,v 1.38 1997/11/22 03:37:34 brian Exp $
*
* TODO:
* o More RFC1772 backwoard compatibility
*/
#include <sys/param.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netdb.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "lcpproto.h"
#include "lcp.h"
#include "ipcp.h"
#include "slcompress.h"
#include "os.h"
#include "phase.h"
#include "loadalias.h"
#include "vars.h"
#include "vjcomp.h"
#include "ip.h"
#include "throughput.h"
#ifndef NOMSEXT
struct in_addr ns_entries[2];
struct in_addr nbns_entries[2];
#endif
struct ipcpstate IpcpInfo;
struct in_range DefMyAddress;
struct in_range DefHisAddress;
struct in_addr TriggerAddress;
int HaveTriggerAddress;
static void IpcpSendConfigReq(struct fsm *);
static void IpcpSendTerminateAck(struct fsm *);
static void IpcpSendTerminateReq(struct fsm *);
static void IpcpDecodeConfig(u_char *, int, int);
static void IpcpLayerStart(struct fsm *);
static void IpcpLayerFinish(struct fsm *);
static void IpcpLayerUp(struct fsm *);
static void IpcpLayerDown(struct fsm *);
static void IpcpInitRestartCounter(struct fsm *);
#define REJECTED(p, x) (p->his_reject & (1<<x))
struct fsm IpcpFsm = {
"IPCP",
PROTO_IPCP,
IPCP_MAXCODE,
OPEN_ACTIVE,
ST_INITIAL,
0, 0, 0,
0,
{0, 0, 0, NULL, NULL, NULL},
{0, 0, 0, NULL, NULL, NULL},
LogIPCP,
IpcpLayerUp,
IpcpLayerDown,
IpcpLayerStart,
IpcpLayerFinish,
IpcpInitRestartCounter,
IpcpSendConfigReq,
IpcpSendTerminateReq,
IpcpSendTerminateAck,
IpcpDecodeConfig,
};
static const char *cftypes[] = {
/* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */
"???",
"IPADDRS", /* 1: IP-Addresses */ /* deprecated */
"COMPPROTO", /* 2: IP-Compression-Protocol */
"IPADDR", /* 3: IP-Address */
};
#define NCFTYPES (sizeof(cftypes)/sizeof(char *))
static const char *cftypes128[] = {
/* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */
"???",
"PRIDNS", /* 129: Primary DNS Server Address */
"PRINBNS", /* 130: Primary NBNS Server Address */
"SECDNS", /* 131: Secondary DNS Server Address */
"SECNBNS", /* 132: Secondary NBNS Server Address */
};
#define NCFTYPES128 (sizeof(cftypes)/sizeof(char *))
struct pppThroughput throughput;
void
IpcpAddInOctets(int n)
{
throughput_addin(&throughput, n);
}
void
IpcpAddOutOctets(int n)
{
throughput_addout(&throughput, n);
}
int
ReportIpcpStatus(struct cmdargs const *arg)
{
struct ipcpstate *icp = &IpcpInfo;
struct fsm *fp = &IpcpFsm;
if (!VarTerm)
return 1;
fprintf(VarTerm, "%s [%s]\n", fp->name, StateNames[fp->state]);
fprintf(VarTerm, " his side: %s, %s\n",
inet_ntoa(icp->his_ipaddr), vj2asc(icp->his_compproto));
fprintf(VarTerm, " my side: %s, %s\n",
inet_ntoa(icp->want_ipaddr), vj2asc(icp->want_compproto));
fprintf(VarTerm, "Defaults:\n");
fprintf(VarTerm, " My Address: %s/%d\n",
inet_ntoa(DefMyAddress.ipaddr), DefMyAddress.width);
fprintf(VarTerm, " His Address: %s/%d\n",
inet_ntoa(DefHisAddress.ipaddr), DefHisAddress.width);
if (HaveTriggerAddress)
fprintf(VarTerm, " Negotiation(trigger): %s\n", inet_ntoa(TriggerAddress));
else
fprintf(VarTerm, " Negotiation(trigger): MYADDR\n");
fprintf(VarTerm, "\n");
throughput_disp(&throughput, VarTerm);
return 0;
}
void
IpcpDefAddress()
{
struct hostent *hp;
char name[200];
memset(&DefMyAddress, '\0', sizeof(DefMyAddress));
memset(&DefHisAddress, '\0', sizeof(DefHisAddress));
TriggerAddress.s_addr = 0;
HaveTriggerAddress = 0;
if (gethostname(name, sizeof(name)) == 0) {
hp = gethostbyname(name);
if (hp && hp->h_addrtype == AF_INET) {
memcpy(&DefMyAddress.ipaddr.s_addr, hp->h_addr, hp->h_length);
}
}
}
void
IpcpInit()
{
struct ipcpstate *icp = &IpcpInfo;
FsmInit(&IpcpFsm);
memset(icp, '\0', sizeof(struct ipcpstate));
if ((mode & MODE_DEDICATED) && !GetLabel()) {
icp->want_ipaddr.s_addr = icp->his_ipaddr.s_addr = 0;
} else {
icp->want_ipaddr.s_addr = DefMyAddress.ipaddr.s_addr;
icp->his_ipaddr.s_addr = DefHisAddress.ipaddr.s_addr;
}
/*
* Some implementations of PPP require that we send a
* *special* value as our address, even though the rfc specifies
* full negotiation (e.g. "0.0.0.0" or Not "0.0.0.0").
*/
if (HaveTriggerAddress) {
icp->want_ipaddr.s_addr = TriggerAddress.s_addr;
LogPrintf(LogIPCP, "Using trigger address %s\n", inet_ntoa(TriggerAddress));
}
if (Enabled(ConfVjcomp))
icp->want_compproto = (PROTO_VJCOMP << 16) | ((MAX_STATES - 1) << 8) | 1;
else
icp->want_compproto = 0;
icp->heis1172 = 0;
IpcpFsm.maxconfig = 10;
throughput_init(&throughput);
}
static void
IpcpInitRestartCounter(struct fsm * fp)
{
fp->FsmTimer.load = VarRetryTimeout * SECTICKS;
fp->restart = 5;
}
static void
IpcpSendConfigReq(struct fsm * fp)
{
u_char *cp;
struct ipcpstate *icp = &IpcpInfo;
struct lcp_opt o;
cp = ReqBuff;
LogPrintf(LogIPCP, "IpcpSendConfigReq\n");
if (!DEV_IS_SYNC || !REJECTED(icp, TY_IPADDR)) {
o.id = TY_IPADDR;
o.len = 6;
*(u_long *)o.data = icp->want_ipaddr.s_addr;
cp += LcpPutConf(LogIPCP, cp, &o, cftypes[o.id],
inet_ntoa(icp->want_ipaddr));
}
if (icp->want_compproto && !REJECTED(icp, TY_COMPPROTO)) {
const char *args;
o.id = TY_COMPPROTO;
if (icp->heis1172) {
o.len = 4;
*(u_short *)o.data = htons(PROTO_VJCOMP);
args = "";
} else {
o.len = 6;
*(u_long *)o.data = htonl(icp->want_compproto);
args = vj2asc(icp->want_compproto);
}
cp += LcpPutConf(LogIPCP, cp, &o, cftypes[o.id], args);
}
FsmOutput(fp, CODE_CONFIGREQ, fp->reqid++, ReqBuff, cp - ReqBuff);
}
static void
IpcpSendTerminateReq(struct fsm * fp)
{
/* XXX: No code yet */
}
static void
IpcpSendTerminateAck(struct fsm * fp)
{
LogPrintf(LogIPCP, "IpcpSendTerminateAck\n");
FsmOutput(fp, CODE_TERMACK, fp->reqid++, NULL, 0);
}
static void
IpcpLayerStart(struct fsm * fp)
{
LogPrintf(LogIPCP, "IpcpLayerStart.\n");
}
static void
IpcpLayerFinish(struct fsm * fp)
{
LogPrintf(LogIPCP, "IpcpLayerFinish.\n");
reconnect(RECON_FALSE);
LcpClose();
NewPhase(PHASE_TERMINATE);
}
static void
IpcpLayerDown(struct fsm * fp)
{
LogPrintf(LogIPCP, "IpcpLayerDown.\n");
throughput_stop(&throughput);
throughput_log(&throughput, LogIPCP, NULL);
}
/*
* Called when IPCP has reached to OPEN state
*/
static void
IpcpLayerUp(struct fsm * fp)
{
char tbuff[100];
Prompt();
LogPrintf(LogIPCP, "IpcpLayerUp(%d).\n", fp->state);
snprintf(tbuff, sizeof(tbuff), "myaddr = %s ",
inet_ntoa(IpcpInfo.want_ipaddr));
if (IpcpInfo.his_compproto >> 16 == PROTO_VJCOMP)
VjInit((IpcpInfo.his_compproto >> 8) & 255);
LogPrintf(LogIsKept(LogIPCP) ? LogIPCP : LogLINK, " %s hisaddr = %s\n",
tbuff, inet_ntoa(IpcpInfo.his_ipaddr));
if (OsSetIpaddress(IpcpInfo.want_ipaddr, IpcpInfo.his_ipaddr, ifnetmask) < 0) {
if (VarTerm)
LogPrintf(LogERROR, "IpcpLayerUp: unable to set ip address\n");
return;
}
#ifndef NOALIAS
if (mode & MODE_ALIAS)
VarPacketAliasSetAddress(IpcpInfo.want_ipaddr);
#endif
OsLinkup();
throughput_start(&throughput);
StartIdleTimer();
}
void
IpcpUp()
{
FsmUp(&IpcpFsm);
LogPrintf(LogIPCP, "IPCP Up event!!\n");
}
void
IpcpOpen()
{
FsmOpen(&IpcpFsm);
}
static int
AcceptableAddr(struct in_range * prange, struct in_addr ipaddr)
{
LogPrintf(LogDEBUG, "requested = %x\n", htonl(ipaddr.s_addr));
LogPrintf(LogDEBUG, "range = %x\n", htonl(prange->ipaddr.s_addr));
LogPrintf(LogDEBUG, "/%x\n", htonl(prange->mask.s_addr));
LogPrintf(LogDEBUG, "%x, %x\n", htonl(prange->ipaddr.s_addr & prange->
mask.s_addr), htonl(ipaddr.s_addr & prange->mask.s_addr));
return (prange->ipaddr.s_addr & prange->mask.s_addr) ==
(ipaddr.s_addr & prange->mask.s_addr) && ipaddr.s_addr;
}
static void
IpcpDecodeConfig(u_char * cp, int plen, int mode_type)
{
int type, length;
u_long *lp, compproto;
struct compreq *pcomp;
struct in_addr ipaddr, dstipaddr, dnsstuff, ms_info_req;
char tbuff[100];
char tbuff2[100];
ackp = AckBuff;
nakp = NakBuff;
rejp = RejBuff;
while (plen >= sizeof(struct fsmconfig)) {
type = *cp;
length = cp[1];
if (type < NCFTYPES)
snprintf(tbuff, sizeof(tbuff), " %s[%d] ", cftypes[type], length);
else if (type > 128 && type < 128 + NCFTYPES128)
snprintf(tbuff, sizeof(tbuff), " %s[%d] ", cftypes128[type], length);
else
snprintf(tbuff, sizeof(tbuff), " ??? ");
switch (type) {
case TY_IPADDR: /* RFC1332 */
lp = (u_long *) (cp + 2);
ipaddr.s_addr = *lp;
LogPrintf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
switch (mode_type) {
case MODE_REQ:
if (!AcceptableAddr(&DefHisAddress, ipaddr)) {
/*
* If destination address is not acceptable, insist to use what we
* want to use.
*/
memcpy(nakp, cp, 2);
memcpy(nakp+2, &IpcpInfo.his_ipaddr.s_addr, length);
nakp += length;
break;
}
IpcpInfo.his_ipaddr = ipaddr;
memcpy(ackp, cp, length);
ackp += length;
break;
case MODE_NAK:
if (AcceptableAddr(&DefMyAddress, ipaddr)) {
/*
* Use address suggested by peer.
*/
snprintf(tbuff2, sizeof(tbuff2), "%s changing address: %s ", tbuff,
inet_ntoa(IpcpInfo.want_ipaddr));
LogPrintf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr));
IpcpInfo.want_ipaddr = ipaddr;
}
break;
case MODE_REJ:
IpcpInfo.his_reject |= (1 << type);
break;
}
break;
case TY_COMPPROTO:
lp = (u_long *) (cp + 2);
compproto = htonl(*lp);
LogPrintf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto));
switch (mode_type) {
case MODE_REQ:
if (!Acceptable(ConfVjcomp)) {
memcpy(rejp, cp, length);
rejp += length;
} else {
pcomp = (struct compreq *) (cp + 2);
switch (length) {
case 4: /* RFC1172 */
if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
LogPrintf(LogWARN, "Peer is speaking RFC1172 compression protocol !\n");
IpcpInfo.heis1172 = 1;
IpcpInfo.his_compproto = compproto;
memcpy(ackp, cp, length);
ackp += length;
} else {
memcpy(nakp, cp, 2);
pcomp->proto = htons(PROTO_VJCOMP);
memcpy(nakp+2, &pcomp, 2);
nakp += length;
}
break;
case 6: /* RFC1332 */
if (ntohs(pcomp->proto) == PROTO_VJCOMP
&& pcomp->slots < MAX_STATES && pcomp->slots > 2) {
IpcpInfo.his_compproto = compproto;
IpcpInfo.heis1172 = 0;
memcpy(ackp, cp, length);
ackp += length;
} else {
memcpy(nakp, cp, 2);
pcomp->proto = htons(PROTO_VJCOMP);
pcomp->slots = MAX_STATES - 1;
pcomp->compcid = 0;
memcpy(nakp+2, &pcomp, sizeof(pcomp));
nakp += length;
}
break;
default:
memcpy(rejp, cp, length);
rejp += length;
break;
}
}
break;
case MODE_NAK:
LogPrintf(LogIPCP, "%s changing compproto: %08x --> %08x\n",
tbuff, IpcpInfo.want_compproto, compproto);
IpcpInfo.want_compproto = compproto;
break;
case MODE_REJ:
IpcpInfo.his_reject |= (1 << type);
break;
}
break;
case TY_IPADDRS: /* RFC1172 */
lp = (u_long *) (cp + 2);
ipaddr.s_addr = *lp;
lp = (u_long *) (cp + 6);
dstipaddr.s_addr = *lp;
snprintf(tbuff2, sizeof(tbuff2), "%s %s,", tbuff, inet_ntoa(ipaddr));
LogPrintf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr));
switch (mode_type) {
case MODE_REQ:
IpcpInfo.his_ipaddr = ipaddr;
IpcpInfo.want_ipaddr = dstipaddr;
memcpy(ackp, cp, length);
ackp += length;
break;
case MODE_NAK:
snprintf(tbuff2, sizeof(tbuff2), "%s changing address: %s", tbuff,
inet_ntoa(IpcpInfo.want_ipaddr));
LogPrintf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr));
IpcpInfo.want_ipaddr = ipaddr;
IpcpInfo.his_ipaddr = dstipaddr;
break;
case MODE_REJ:
IpcpInfo.his_reject |= (1 << type);
break;
}
break;
/*
* MS extensions for MS's PPP
*/
#ifndef NOMSEXT
case TY_PRIMARY_DNS: /* MS PPP DNS negotiation hack */
case TY_SECONDARY_DNS:
if (!Enabled(ConfMSExt)) {
LogPrintf(LogIPCP, "MS NS req - rejected - msext disabled\n");
IpcpInfo.my_reject |= (1 << type);
memcpy(rejp, cp, length);
rejp += length;
break;
}
switch (mode_type) {
case MODE_REQ:
lp = (u_long *) (cp + 2);
dnsstuff.s_addr = *lp;
ms_info_req.s_addr = ns_entries[((type - TY_PRIMARY_DNS) ? 1 : 0)].s_addr;
if (dnsstuff.s_addr != ms_info_req.s_addr) {
/*
* So the client has got the DNS stuff wrong (first request) so
* we'll tell 'em how it is
*/
memcpy(nakp, cp, 2); /* copy first two (type/length) */
LogPrintf(LogIPCP, "MS NS req %d:%s->%s - nak\n",
type,
inet_ntoa(dnsstuff),
inet_ntoa(ms_info_req));
memcpy(nakp+2, &ms_info_req, length);
nakp += length;
break;
}
/*
* Otherwise they have it right (this time) so we send a ack packet
* back confirming it... end of story
*/
LogPrintf(LogIPCP, "MS NS req %d:%s ok - ack\n",
type,
inet_ntoa(ms_info_req));
memcpy(ackp, cp, length);
ackp += length;
break;
case MODE_NAK: /* what does this mean?? */
LogPrintf(LogIPCP, "MS NS req %d - NAK??\n", type);
break;
case MODE_REJ: /* confused?? me to :) */
LogPrintf(LogIPCP, "MS NS req %d - REJ??\n", type);
break;
}
break;
case TY_PRIMARY_NBNS: /* MS PPP NetBIOS nameserver hack */
case TY_SECONDARY_NBNS:
if (!Enabled(ConfMSExt)) {
LogPrintf(LogIPCP, "MS NBNS req - rejected - msext disabled\n");
IpcpInfo.my_reject |= (1 << type);
memcpy(rejp, cp, length);
rejp += length;
break;
}
switch (mode_type) {
case MODE_REQ:
lp = (u_long *) (cp + 2);
dnsstuff.s_addr = *lp;
ms_info_req.s_addr = nbns_entries[((type - TY_PRIMARY_NBNS) ? 1 : 0)].s_addr;
if (dnsstuff.s_addr != ms_info_req.s_addr) {
memcpy(nakp, cp, 2);
memcpy(nakp+2, &ms_info_req.s_addr, length);
LogPrintf(LogIPCP, "MS NBNS req %d:%s->%s - nak\n",
type,
inet_ntoa(dnsstuff),
inet_ntoa(ms_info_req));
nakp += length;
break;
}
LogPrintf(LogIPCP, "MS NBNS req %d:%s ok - ack\n",
type,
inet_ntoa(ms_info_req));
memcpy(ackp, cp, length);
ackp += length;
break;
case MODE_NAK:
LogPrintf(LogIPCP, "MS NBNS req %d - NAK??\n", type);
break;
case MODE_REJ:
LogPrintf(LogIPCP, "MS NBNS req %d - REJ??\n", type);
break;
}
break;
#endif
default:
IpcpInfo.my_reject |= (1 << type);
memcpy(rejp, cp, length);
rejp += length;
break;
}
plen -= length;
cp += length;
}
}
void
IpcpInput(struct mbuf * bp)
{
FsmInput(&IpcpFsm, bp);
}
|