Bug Summary

File:src/usr.sbin/tcpdump/print-ppp.c
Warning:line 565, column 4
Value stored to 'l' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name print-ppp.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/usr.sbin/tcpdump/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/usr.sbin/tcpdump/../../sbin/pfctl -I /usr/src/usr.sbin/tcpdump/../hostapd -I /usr/src/usr.sbin/tcpdump/../../lib/libpcap -D CSLIP -D PPP -D HAVE_FDDI -D ETHER_SERVICE -D HAVE_ETHER_NTOHOST -D INET6 -I /usr/src/usr.sbin/tcpdump/../../sbin/pfctl -D FAKE_PF_KERNEL -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/usr.sbin/tcpdump/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/usr.sbin/tcpdump/print-ppp.c
1/* $OpenBSD: print-ppp.c,v 1.36 2021/12/01 18:28:46 deraadt Exp $ */
2
3/*
4 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that: (1) source code distributions
9 * retain the above copyright notice and this paragraph in its entirety, (2)
10 * distributions including binary code include the above copyright notice and
11 * this paragraph in its entirety in the documentation or other materials
12 * provided with the distribution, and (3) all advertising materials mentioning
13 * features or use of this software display the following acknowledgement:
14 * ``This product includes software developed by the University of California,
15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
16 * the University nor the names of its contributors may be used to endorse
17 * or promote products derived from this software without specific prior
18 * written permission.
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22 */
23
24#ifdef PPP1
25#include <sys/time.h>
26#include <sys/socket.h>
27#include <sys/file.h>
28#include <sys/ioctl.h>
29
30#include <net/if.h>
31
32#include <netinet/in.h>
33#include <netinet/ip.h>
34
35#include <ctype.h>
36#include <netdb.h>
37#include <pcap.h>
38#include <signal.h>
39#include <stdio.h>
40
41#include <netinet/if_ether.h>
42#include "ethertype.h"
43
44#include <net/ppp_defs.h>
45#include "interface.h"
46#include "addrtoname.h"
47#include "extract.h"
48
49#ifndef nitems
50#define nitems(_a)(sizeof((_a)) / sizeof((_a)[0])) (sizeof((_a)) / sizeof((_a)[0]))
51#endif
52
53#ifndef PPP_EAP0xc227
54#define PPP_EAP0xc227 0xc227
55#endif
56
57#ifndef PPP_CDP0x0207
58#define PPP_CDP0x0207 0x0207
59#endif
60
61#ifndef PPP_CDPCP0x8207
62#define PPP_CDPCP0x8207 0x8207
63#endif
64
65struct protonames {
66 u_short protocol;
67 char *name;
68};
69
70static const struct protonames protonames[] = {
71 /*
72 * Protocol field values.
73 */
74 { PPP_IP0x21, "IP" }, /* Internet Protocol */
75 { PPP_XNS0x25, "XNS" }, /* Xerox NS */
76 { PPP_IPX0x2b, "IPX" }, /* IPX Datagram (RFC1552) */
77 { PPP_AT0x29, "AppleTalk" }, /* AppleTalk Protocol */
78 { PPP_VJC_COMP0x2d, "VJC_UNCOMP" }, /* VJ compressed TCP */
79 { PPP_VJC_UNCOMP0x2f,"VJC_UNCOMP" },/* VJ uncompressed TCP */
80 { PPP_IPV60x57, "IPv6" }, /* Internet Protocol version 6 */
81 { PPP_COMP0xfd, "COMP" }, /* compressed packet */
82 { PPP_IPCP0x8021, "IPCP" }, /* IP Control Protocol */
83 { PPP_ATCP0x8029, "AppleTalkCP" },/* AppleTalk Control Protocol */
84 { PPP_IPXCP0x802b, "IPXCP" }, /* IPX Control Protocol (RFC1552) */
85 { PPP_IPV6CP0x8057, "IPV6CP" }, /* IPv6 Control Protocol */
86 { PPP_CCP0x80fd, "CCP" }, /* Compression Control Protocol */
87 { PPP_LCP0xc021, "LCP" }, /* Link Control Protocol */
88 { PPP_PAP0xc023, "PAP" }, /* Password Authentication Protocol */
89 { PPP_LQR0xc025, "LQR" }, /* Link Quality Report protocol */
90 { PPP_CBCP0xc029, "CBCP" }, /* Callback Control Protocol */
91 { PPP_CHAP0xc223, "CHAP" }, /* Cryptographic Handshake Auth. Proto */
92 { PPP_EAP0xc227, "EAP" }, /* Extensible Auth. Protocol */
93 { PPP_CDP0x0207, "CDP" },
94 { PPP_CDPCP0x8207, "CDPCP" },
95};
96
97struct ppp_control {
98 uint8_t code;
99 uint8_t id;
100 uint16_t len;
101};
102
103struct ppp_cp_type {
104 const char *unkname;
105 int mincode;
106 int maxcode;
107 const char **codes;
108};
109
110/* LCP */
111
112#define LCP_CONF_REQ1 1
113#define LCP_CONF_ACK2 2
114#define LCP_CONF_NAK3 3
115#define LCP_CONF_REJ4 4
116#define LCP_TERM_REQ5 5
117#define LCP_TERM_ACK6 6
118#define LCP_CODE_REJ7 7
119#define LCP_PROT_REJ8 8
120#define LCP_ECHO_REQ9 9
121#define LCP_ECHO_RPL10 10
122#define LCP_DISC_REQ11 11
123
124#define LCP_MIN1 LCP_CONF_REQ1
125#define LCP_MAX11 LCP_DISC_REQ11
126
127static const char *lcpcodes[] = {
128 /*
129 * LCP code values (RFC1661, pp26)
130 */
131 "Configure-Request",
132 "Configure-Ack",
133 "Configure-Nak",
134 "Configure-Reject",
135 "Terminate-Request",
136 "Terminate-Ack",
137 "Code-Reject",
138 "Protocol-Reject",
139 "Echo-Request",
140 "Echo-Reply",
141 "Discard-Request",
142};
143
144#define LCPOPT_VEXT0 0
145#define LCPOPT_MRU1 1
146#define LCPOPT_ACCM2 2
147#define LCPOPT_AP3 3
148#define LCPOPT_QP4 4
149#define LCPOPT_MN5 5
150#define LCPOPT_PFC7 7
151#define LCPOPT_ACFC8 8
152
153static char *lcpconfopts[] = {
154 "Vendor-Ext",
155 "Max-Rx-Unit",
156 "Async-Ctrl-Char-Map",
157 "Auth-Prot",
158 "Quality-Prot",
159 "Magic-Number",
160 "unassigned (6)",
161 "Prot-Field-Compr",
162 "Add-Ctrl-Field-Compr",
163 "FCS-Alternatives",
164 "Self-Describing-Pad",
165 "Numbered-Mode",
166 "Multi-Link-Procedure",
167 "Call-Back",
168 "Connect-Time"
169 "Compund-Frames",
170 "Nominal-Data-Encap",
171 "Multilink-MRRU",
172 "Multilink-SSNHF",
173 "Multilink-ED",
174 "Proprietary",
175 "DCE-Identifier",
176 "Multilink-Plus-Proc",
177 "Link-Discriminator",
178 "LCP-Auth-Option",
179};
180
181/* CHAP */
182
183#define CHAP_CHAL1 1
184#define CHAP_RESP2 2
185#define CHAP_SUCC3 3
186#define CHAP_FAIL4 4
187
188#define CHAP_CODEMIN1 1
189#define CHAP_CODEMAX4 4
190
191static const char *chapcode[] = {
192 "Challenge",
193 "Response",
194 "Success",
195 "Failure",
196};
197
198/* PAP */
199
200#define PAP_AREQ1 1
201#define PAP_AACK2 2
202#define PAP_ANAK3 3
203
204#define PAP_CODEMIN1 1
205#define PAP_CODEMAX3 3
206
207static const char *papcode[] = {
208 "Authenticate-Request",
209 "Authenticate-Ack",
210 "Authenticate-Nak",
211};
212
213/* EAP */
214
215#define EAP_CHAL1 1
216#define EAP_RESP2 2
217#define EAP_SUCC3 3
218#define EAP_FAIL4 4
219
220#define EAP_CODEMIN1 EAP_CHAL1
221#define EAP_CODEMAX4 EAP_FAIL4
222
223#define EAP_TYPE_IDENTITY1 1
224#define EAP_TYPE_NOTIFICATION2 2
225#define EAP_TYPE_NAK3 3
226#define EAP_TYPE_MD5_CHALLENGE4 4
227#define EAP_TYPE_OTP5 5
228#define EAP_TYPE_TOKEN6 6
229
230#define EAP_TYPEMIN1 EAP_TYPE_IDENTITY1
231#define EAP_TYPEMAX6 EAP_TYPE_TOKEN6
232
233static const char *eapcode[] = {
234 "Challenge",
235 "Response",
236 "Success",
237 "Failure",
238};
239
240static const char *eaptype[] = {
241 "Identity",
242 "Notification",
243 "Nak",
244 "MD5-Challenge",
245 "One-Time-Password",
246 "Token",
247};
248
249
250/* IPCP */
251
252#define IPCP_CODE_CFG_REQ1 1
253#define IPCP_CODE_CFG_ACK2 2
254#define IPCP_CODE_CFG_NAK3 3
255#define IPCP_CODE_CFG_REJ4 4
256#define IPCP_CODE_TRM_REQ5 5
257#define IPCP_CODE_TRM_ACK6 6
258#define IPCP_CODE_COD_REJ7 7
259
260#define IPCP_CODE_MIN1 IPCP_CODE_CFG_REQ1
261#define IPCP_CODE_MAX7 IPCP_CODE_COD_REJ7
262
263#define IPCP_2ADDR1 1
264#define IPCP_CP2 2
265#define IPCP_ADDR3 3
266
267/* IPV6CP */
268
269#define IPV6CP_CODE_CFG_REQ1 1
270#define IPV6CP_CODE_CFG_ACK2 2
271#define IPV6CP_CODE_CFG_NAK3 3
272#define IPV6CP_CODE_CFG_REJ4 4
273#define IPV6CP_CODE_TRM_REQ5 5
274#define IPV6CP_CODE_TRM_ACK6 6
275#define IPV6CP_CODE_COD_REJ7 7
276
277#define IPV6CP_CODE_MIN1 IPV6CP_CODE_CFG_REQ1
278#define IPV6CP_CODE_MAX7 IPV6CP_CODE_COD_REJ7
279
280#define IPV6CP_IFID1 1
281
282static int print_lcp_config_options(const u_char *p, int);
283static void handle_lcp(const u_char *, int);
284static void handle_chap(const u_char *p, int);
285static void handle_eap(const u_char *p, int);
286static void handle_ipcp(const u_char *p, int);
287static int print_ipcp_config_options(const u_char *, int);
288static void handle_ipv6cp(const u_char *p, int);
289static int print_ipv6cp_config_options(const u_char *, int);
290static void handle_pap(const u_char *p, int);
291
292struct pppoe_header {
293 u_int8_t vertype; /* PPPoE version/type */
294 u_int8_t code; /* PPPoE code (packet type) */
295 u_int16_t sessionid; /* PPPoE session id */
296 u_int16_t len; /* PPPoE payload length */
297};
298#define PPPOE_CODE_SESSION0x00 0x00 /* Session */
299#define PPPOE_CODE_PADO0x07 0x07 /* Active Discovery Offer */
300#define PPPOE_CODE_PADI0x09 0x09 /* Active Discovery Initiation */
301#define PPPOE_CODE_PADR0x19 0x19 /* Active Discovery Request */
302#define PPPOE_CODE_PADS0x65 0x65 /* Active Discovery Session-Confirm */
303#define PPPOE_CODE_PADT0xa7 0xa7 /* Active Discovery Terminate */
304#define PPPOE_TAG_END_OF_LIST0x0000 0x0000 /* End Of List */
305#define PPPOE_TAG_SERVICE_NAME0x0101 0x0101 /* Service Name */
306#define PPPOE_TAG_AC_NAME0x0102 0x0102 /* Access Concentrator Name */
307#define PPPOE_TAG_HOST_UNIQ0x0103 0x0103 /* Host Uniq */
308#define PPPOE_TAG_AC_COOKIE0x0104 0x0104 /* Access Concentratr Cookie */
309#define PPPOE_TAG_VENDOR_SPEC0x0105 0x0105 /* Vendor Specific */
310#define PPPOE_TAG_RELAY_SESSION0x0110 0x0110 /* Relay Session Id */
311#define PPPOE_TAG_MAX_PAYLOAD0x0120 0x0120 /* RFC 4638 Max Payload */
312#define PPPOE_TAG_SERVICE_NAME_ERROR0x0201 0x0201 /* Service Name Error */
313#define PPPOE_TAG_AC_SYSTEM_ERROR0x0202 0x0202 /* Acc. Concentrator Error */
314#define PPPOE_TAG_GENERIC_ERROR0x0203 0x0203 /* Generic Error */
315
316static void
317ppp_protoname(uint16_t proto)
318{
319 const struct protonames *protoname;
320 int i;
321
322 /* bsearch? */
323 for (i = 0; i < nitems(protonames)(sizeof((protonames)) / sizeof((protonames)[0])); i++) {
324 protoname = &protonames[i];
325
326 if (proto == protoname->protocol) {
327 printf("%s ", protoname->name);
328 return;
329 }
330 }
331
332 printf("unknown-ppp-%04x", proto);
333}
334
335void
336ppp_print(const u_char *p, u_int length)
337{
338 uint16_t proto;
339 int l;
340
341 l = snapend - p;
342
343 if (l < sizeof(proto)) {
344 printf("[|ppp]");
345 return;
346 }
347
348 proto = EXTRACT_16BITS(p)((u_int16_t)*((const u_int8_t *)(p) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p) + 1));
349
350 p += sizeof(proto);
351 l -= sizeof(proto);
352 length -= sizeof(proto);
353
354 if (eflag)
355 ppp_protoname(proto);
356
357 switch (proto) {
358 case PPP_IP0x21:
359 ip_print(p, length);
360 return;
361 case PPP_IPV60x57:
362 ip6_print(p, length);
363 return;
364 }
365
366 if (!eflag)
367 ppp_protoname(proto);
368
369 switch(proto) {
370 case PPP_LCP0xc021:
371 handle_lcp(p, l);
372 break;
373 case PPP_CHAP0xc223:
374 handle_chap(p, l);
375 break;
376 case PPP_EAP0xc227:
377 handle_eap(p, l);
378 break;
379 case PPP_PAP0xc023:
380 handle_pap(p, l);
381 break;
382 case PPP_IPCP0x8021:
383 handle_ipcp(p, l);
384 break;
385 case PPP_IPV6CP0x8057:
386 handle_ipv6cp(p, l);
387 break;
388 case PPP_CDP0x0207:
389 cdp_print(p, length, l, 0);
390 break;
391 }
392}
393
394static int
395ppp_cp_header(struct ppp_control *pc, const u_char *p, int l,
396 const struct ppp_cp_type *t)
397{
398 uint8_t code;
399 int off = 0;
400 int len;
401
402 len = sizeof(pc->code);
403 if (l < len)
404 return (-1);
405
406 pc->code = code = *(p + off);
407 if (code >= t->mincode && code <= t->maxcode)
408 printf("%s ", t->codes[code - 1]);
409 else
410 printf("unknown-%s-%u ", t->unkname, pc->code);
411
412 off = len;
413 len += sizeof(pc->id);
414 if (l < len)
415 return (-1);
416
417 pc->id = *(p + off);
418 printf("Id=0x%02x:", pc->id);
419
420 off = len;
421 len += sizeof(pc->len);
422 if (l < len)
423 return (-1);
424
425 pc->len = EXTRACT_16BITS(p + off)((u_int16_t)*((const u_int8_t *)(p + off) + 0) << 8 | (
u_int16_t)*((const u_int8_t *)(p + off) + 1));
426
427 return (len);
428}
429
430/* print LCP frame */
431
432static const struct ppp_cp_type ppp_cp_lcp = {
433 "lcp",
434 LCP_MIN1, LCP_MAX11,
435 lcpcodes,
436};
437
438static void
439handle_lcp(const u_char *p, int l)
440{
441 struct ppp_control pc;
442 int i;
443
444 if (ppp_cp_header(&pc, p, l, &ppp_cp_lcp) == -1)
445 goto trunc;
446
447 if (l > pc.len)
448 l = pc.len;
449
450 p += sizeof(pc);
451 l -= sizeof(pc);
452
453 switch (pc.code) {
454 case LCP_CONF_REQ1:
455 case LCP_CONF_ACK2:
456 case LCP_CONF_NAK3:
457 case LCP_CONF_REJ4:
458 while (l > 0) {
459 int optlen;
460
461 optlen = print_lcp_config_options(p, l);
462 if (optlen == -1)
463 goto trunc;
464 if (optlen == 0)
465 break;
466
467 p += optlen;
468 l -= optlen;
469 }
470 break;
471 case LCP_ECHO_REQ9:
472 case LCP_ECHO_RPL10:
473 if (l < 4)
474 goto trunc;
475 printf(" Magic-Number=%u", EXTRACT_32BITS(p)((u_int32_t)*((const u_int8_t *)(p) + 0) << 24 | (u_int32_t
)*((const u_int8_t *)(p) + 1) << 16 | (u_int32_t)*((const
u_int8_t *)(p) + 2) << 8 | (u_int32_t)*((const u_int8_t
*)(p) + 3)));
476 p += 4;
477 l -= 4;
478
479 i = sizeof(pc) + 4;
480 if (i == pc.len)
481 break;
482
483 printf(" Data=");
484 do {
485 if (l == 0)
486 goto trunc;
487
488 printf("%02x", *p);
489
490 p++;
491 l--;
492 } while (++i < pc.len);
493 break;
494 case LCP_TERM_REQ5:
495 case LCP_TERM_ACK6:
496 case LCP_CODE_REJ7:
497 case LCP_PROT_REJ8:
498 case LCP_DISC_REQ11:
499 default:
500 break;
501 }
502 return;
503
504trunc:
505 printf("[|lcp]");
506}
507
508/* LCP config options */
509
510static int
511print_lcp_config_options(const u_char *p, int l)
512{
513 uint8_t type, length;
514 uint16_t proto;
515
516 if (l < sizeof(type))
517 return (-1);
518
519 type = p[0];
520 if (type < nitems(lcpconfopts)(sizeof((lcpconfopts)) / sizeof((lcpconfopts)[0])))
521 printf(" %s", lcpconfopts[type]);
522 else
523 printf(" unknown-lcp-%u", type);
524
525 if (l < sizeof(type) + sizeof(length))
526 return (-1);
527
528 length = p[1];
529
530 if (length < sizeof(type) + sizeof(length))
531 return (0);
532
533 if (l > length)
534 l = length;
535
536 p += sizeof(type) + sizeof(length);
537 l -= sizeof(type) + sizeof(length);
538
539 switch (type) {
540 case LCPOPT_MRU1:
541 if (length != 4)
542 goto invalid;
543 if (l < 2)
544 return (-1);
545
546 printf("=%u", EXTRACT_16BITS(p)((u_int16_t)*((const u_int8_t *)(p) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p) + 1)));
547 break;
548 case LCPOPT_AP3:
549 if (length < 4)
550 goto invalid;
551 if (l < sizeof(proto))
552 return (-1);
553
554 proto = EXTRACT_16BITS(p)((u_int16_t)*((const u_int8_t *)(p) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p) + 1));
555 switch (proto) {
556 case PPP_PAP0xc023:
557 printf("=PAP");
558 break;
559 case PPP_CHAP0xc223:
560 printf("=CHAP");
561 if (length < 5)
562 goto invalid;
563
564 p += sizeof(proto);
565 l -= sizeof(proto);
Value stored to 'l' is never read
566
567 type = *p;
568 switch (type) {
569 case 0x05:
570 printf("/MD5");
571 break;
572 case 0x80:
573 printf("/Microsoft");
574 break;
575 default:
576 printf("/unknown-algorithm-%02x", type);
577 break;
578 }
579 break;
580 case PPP_EAP0xc227:
581 printf("=EAP");
582 break;
583 case 0xc027:
584 printf("=SPAP");
585 break;
586 case 0xc127:
587 printf("=Old-SPAP");
588 break;
589 default:
590 printf("=unknown-ap-%04x", proto);
591 break;
592 }
593 break;
594 case LCPOPT_QP4:
595 if (length < 4)
596 goto invalid;
597 if (l < sizeof(proto))
598 return (-1);
599
600 proto = EXTRACT_16BITS(p)((u_int16_t)*((const u_int8_t *)(p) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p) + 1));
601 switch (proto) {
602 case PPP_LQR0xc025:
603 printf(" LQR");
604 break;
605 default:
606 printf(" unknown-qp-%u", proto);
607 }
608 break;
609 case LCPOPT_MN5:
610 if (length < 6)
611 goto invalid;
612 if (l < 4)
613 return (-1);
614
615 printf("=%u", EXTRACT_32BITS(p)((u_int32_t)*((const u_int8_t *)(p) + 0) << 24 | (u_int32_t
)*((const u_int8_t *)(p) + 1) << 16 | (u_int32_t)*((const
u_int8_t *)(p) + 2) << 8 | (u_int32_t)*((const u_int8_t
*)(p) + 3)));
616 break;
617 case LCPOPT_PFC7:
618 printf(" PFC");
619 break;
620 case LCPOPT_ACFC8:
621 printf(" ACFC");
622 break;
623 }
624
625 return (length);
626
627invalid:
628 printf(" invalid opt len %u", length);
629 return (length);
630}
631
632/* CHAP */
633
634static const struct ppp_cp_type ppp_cp_chap = {
635 "chap",
636 CHAP_CODEMIN1, CHAP_CODEMAX4,
637 chapcode,
638};
639
640static void
641handle_chap(const u_char *p, int l)
642{
643 struct ppp_control pc;
644 uint8_t vsize;
645 int i;
646
647 if (ppp_cp_header(&pc, p, l, &ppp_cp_chap) == -1)
648 goto trunc;
649
650 if (l > pc.len)
651 l = pc.len;
652
653 p += sizeof(pc);
654 l -= sizeof(pc);
655
656 switch (pc.code) {
657 case CHAP_CHAL1:
658 case CHAP_RESP2:
659 if (l < sizeof(vsize))
660 goto trunc;
661
662 vsize = *p;
663 if (vsize < 1) {
664 printf(" invalid Value-Size");
665 return;
666 }
667
668 p += sizeof(vsize);
669 l -= sizeof(vsize);
670
671 printf(" Value=");
672 for (i = 0; i < vsize; i++) {
673 if (l == 0)
674 goto trunc;
675
676 printf("%02x", *p);
677
678 p++;
679 l--;
680 }
681
682 printf(" Name=");
683 for (i += sizeof(pc) + sizeof(vsize); i < pc.len; i++) {
684 if (l == 0)
685 goto trunc;
686
687 safeputchar(*p);
688
689 p++;
690 l--;
691 }
692 break;
693 case CHAP_SUCC3:
694 case CHAP_FAIL4:
695 printf(" Message=");
696 for (i = sizeof(pc); i < pc.len; i++) {
697 if (l == 0)
698 goto trunc;
699
700 safeputchar(*p);
701
702 p++;
703 l--;
704 }
705 break;
706 }
707 return;
708
709trunc:
710 printf("[|chap]");
711}
712
713/* EAP */
714
715static const struct ppp_cp_type ppp_cp_eap = {
716 "eap",
717 EAP_CODEMIN1, EAP_CODEMAX4,
718 eapcode,
719};
720
721static void
722handle_eap(const u_char *p, int l)
723{
724 struct ppp_control pc;
725 uint8_t type, vsize;
726 int i;
727
728 if (ppp_cp_header(&pc, p, l, &ppp_cp_eap) == -1)
729 goto trunc;
730
731 if (l > pc.len)
732 l = pc.len;
733
734 p += sizeof(pc);
735 l -= sizeof(pc);
736
737 switch (pc.code) {
738 case EAP_CHAL1:
739 case EAP_RESP2:
740 if (l < sizeof(type))
741 goto trunc;
742
743 type = *p;
744 p += sizeof(type);
745 l -= sizeof(type);
746
747 if (type >= EAP_TYPEMIN1 && type <= EAP_TYPEMAX6)
748 printf(" %s", eaptype[type - 1]);
749 else {
750 printf(" unknown-eap-type-%u", type);
751 return;
752 }
753
754 switch (type) {
755 case EAP_TYPE_IDENTITY1:
756 case EAP_TYPE_NOTIFICATION2:
757 case EAP_TYPE_OTP5:
758 i = sizeof(pc) + sizeof(type);
759 if (i == pc.len)
760 break;
761
762 printf("=");
763 do {
764 if (l == 0)
765 goto trunc;
766
767 safeputchar(*p);
768
769 p++;
770 l--;
771 } while (++i < pc.len);
772 break;
773
774 case EAP_TYPE_NAK3:
775 if (l < sizeof(type))
776 goto trunc;
777 type = *p;
778 if (type >= EAP_TYPEMIN1 && type <= EAP_TYPEMAX6)
779 printf(" %s", eaptype[type - 1]);
780 else
781 printf(" unknown-eap-type-%u", type);
782 break;
783 case EAP_TYPE_MD5_CHALLENGE4:
784 if (l < sizeof(vsize))
785 goto trunc;
786
787 vsize = *p;
788 p += sizeof(vsize);
789 l -= sizeof(vsize);
790
791 printf("=");
792 for (i = 0; i < vsize; i++) {
793 if (l == 0)
794 goto trunc;
795
796 printf("%02x", *p);
797
798 p++;
799 l--;
800 }
801 break;
802 }
803 break;
804 case CHAP_SUCC3:
805 case CHAP_FAIL4:
806 break;
807 }
808 return;
809
810trunc:
811 printf("[|eap]");
812}
813
814/* PAP */
815
816static const struct ppp_cp_type ppp_cp_pap = {
817 "pap",
818 PAP_CODEMIN1, PAP_CODEMAX3,
819 papcode,
820};
821
822static void
823handle_pap(const u_char *p, int l)
824{
825 struct ppp_control pc;
826 uint8_t x;
827 int i;
828
829 if (ppp_cp_header(&pc, p, l, &ppp_cp_pap) == -1)
830 goto trunc;
831
832 if (l > pc.len)
833 l = pc.len;
834
835 p += sizeof(pc);
836 l -= sizeof(pc);
837
838 switch (pc.code) {
839 case PAP_AREQ1:
840 if (l < sizeof(x)) /* Peer-ID Length */
841 goto trunc;
842
843 x = *p;
844
845 p += sizeof(x);
846 l -= sizeof(x);
847
848 printf(" Peer-Id=");
849 for (i = 0; i < x; i++) {
850 if (l == 0)
851 goto trunc;
852
853 safeputchar(*p);
854
855 p++;
856 l--;
857 }
858
859 if (l < sizeof(x)) /* Passwd-Length */
860 goto trunc;
861
862 x = *p;
863
864 p += sizeof(x);
865 l -= sizeof(x);
866
867 printf(" Passwd=");
868 for (i = 0; i < x; i++) {
869 if (l == 0)
870 goto trunc;
871
872 safeputchar(*p);
873
874 p++;
875 l--;
876 }
877 break;
878
879 case PAP_AACK2:
880 case PAP_ANAK3:
881 if (l < sizeof(x)) /* Msg-Length */
882 goto trunc;
883
884 x = *p;
885
886 p += sizeof(x);
887 l -= sizeof(x);
888
889 printf(" Message=");
890 for (i = 0; i < x; i++) {
891 if (l == 0)
892 goto trunc;
893
894 safeputchar(*p);
895
896 p++;
897 l--;
898 }
899 break;
900 }
901
902 return;
903
904trunc:
905 printf("[|pap]");
906}
907
908/* IPCP */
909
910#define IP_LEN4 4
911#define IP_FMT"%u.%u.%u.%u" "%u.%u.%u.%u"
912#define IP_ARG(_p)(_p)[0], (_p)[1], (_p)[2], (_p)[3] (_p)[0], (_p)[1], (_p)[2], (_p)[3]
913
914static const struct ppp_cp_type ppp_cp_ipcp = {
915 "ipcp",
916 IPCP_CODE_MIN1, IPCP_CODE_MAX7,
917 lcpcodes,
918};
919
920static void
921handle_ipcp(const u_char *p, int l)
922{
923 struct ppp_control pc;
924
925 if (ppp_cp_header(&pc, p, l, &ppp_cp_ipcp) == -1)
926 goto trunc;
927
928 if (l > pc.len)
929 l = pc.len;
930
931 p += sizeof(pc);
932 l -= sizeof(pc);
933
934 switch (pc.code) {
935 case IPCP_CODE_CFG_REQ1:
936 case IPCP_CODE_CFG_ACK2:
937 case IPCP_CODE_CFG_NAK3:
938 case IPCP_CODE_CFG_REJ4:
939 while (l > 0) {
940 int optlen;
941
942 optlen = print_ipcp_config_options(p, l);
943 if (optlen == -1)
944 goto trunc;
945 if (optlen == 0)
946 break;
947
948 p += optlen;
949 l -= optlen;
950 }
951 break;
952
953 case IPCP_CODE_TRM_REQ5:
954 case IPCP_CODE_TRM_ACK6:
955 case IPCP_CODE_COD_REJ7:
956 default:
957 break;
958 }
959
960 return;
961
962trunc:
963 printf("[|ipcp]");
964}
965
966static int
967print_ipcp_config_options(const u_char *p, int l)
968{
969 uint8_t type, length;
970
971 if (l < sizeof(type))
972 return (-1);
973
974 type = p[0];
975 switch (type) {
976 case IPCP_2ADDR1:
977 printf(" IP-Addresses");
978 break;
979 case IPCP_CP2:
980 printf(" IP-Compression-Protocol");
981 break;
982 case IPCP_ADDR3:
983 printf(" IP-Address");
984 break;
985 default:
986 printf(" ipcp-type-%u", type);
987 break;
988 }
989
990 if (l < sizeof(type) + sizeof(length))
991 return (-1);
992
993 length = p[1];
994
995 p += (sizeof(type) + sizeof(length));
996 l -= (sizeof(type) + sizeof(length));
997
998 switch (type) {
999 case IPCP_2ADDR1:
1000 if (length != 10)
1001 goto invalid;
1002 if (l < IP_LEN4)
1003 return (-1);
1004
1005 printf(" Src=" IP_FMT"%u.%u.%u.%u", IP_ARG(p)(p)[0], (p)[1], (p)[2], (p)[3]);
1006
1007 p += IP_LEN4;
1008 l -= IP_LEN4;
1009
1010 if (l < IP_LEN4)
1011 return (-1);
1012
1013 printf(" Dst=" IP_FMT"%u.%u.%u.%u", IP_ARG(p)(p)[0], (p)[1], (p)[2], (p)[3]);
1014 break;
1015 case IPCP_CP2:
1016 if (length < 4)
1017 goto invalid;
1018 if (l < sizeof(type))
1019 return (-1);
1020
1021 type = EXTRACT_16BITS(p)((u_int16_t)*((const u_int8_t *)(p) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p) + 1));
1022 switch (type) {
1023 case 0x0037:
1024 printf(" Van Jacobsen Compressed TCP/IP");
1025 break;
1026 default:
1027 printf("ipcp-compression-type-%u", type);
1028 break;
1029 }
1030 break;
1031 case IPCP_ADDR3:
1032 if (length != 6)
1033 goto invalid;
1034 if (l < IP_LEN4)
1035 return (-1);
1036
1037 printf("=" IP_FMT"%u.%u.%u.%u", IP_ARG(p)(p)[0], (p)[1], (p)[2], (p)[3]);
1038 break;
1039 }
1040
1041 return (length);
1042
1043invalid:
1044 printf(" invalid opt len %u", length);
1045 return (length);
1046}
1047
1048/* IPV6CP */
1049
1050static const struct ppp_cp_type ppp_cp_ipv6cp = {
1051 "ipv6cp",
1052 IPV6CP_CODE_MIN1, IPV6CP_CODE_MAX7,
1053 lcpcodes,
1054};
1055
1056static void
1057handle_ipv6cp(const u_char *p, int l)
1058{
1059 struct ppp_control pc;
1060
1061 if (ppp_cp_header(&pc, p, l, &ppp_cp_ipv6cp) == -1)
1062 goto trunc;
1063
1064 if (l > pc.len)
1065 l = pc.len;
1066
1067 p += sizeof(pc);
1068 l -= sizeof(pc);
1069
1070 switch (pc.code) {
1071 case IPV6CP_CODE_CFG_REQ1:
1072 case IPV6CP_CODE_CFG_ACK2:
1073 case IPV6CP_CODE_CFG_NAK3:
1074 case IPV6CP_CODE_CFG_REJ4:
1075 while (l > 0) {
1076 int optlen;
1077
1078 optlen = print_ipv6cp_config_options(p, l);
1079 if (optlen == -1)
1080 goto trunc;
1081 if (optlen == 0)
1082 break;
1083
1084 p += optlen;
1085 l -= optlen;
1086 }
1087 break;
1088
1089 case IPV6CP_CODE_TRM_REQ5:
1090 case IPV6CP_CODE_TRM_ACK6:
1091 case IPV6CP_CODE_COD_REJ7:
1092 default:
1093 break;
1094 }
1095
1096 return;
1097
1098trunc:
1099 printf("[|ipv6cp]");
1100}
1101
1102static int
1103print_ipv6cp_config_options(const u_char *p, int l)
1104{
1105 uint8_t type, length;
1106
1107 if (l < sizeof(type))
1108 return (-1);
1109
1110 type = p[0];
1111 switch (type) {
1112 case IPV6CP_IFID1:
1113 printf(" IPv6-Interface-Id");
1114 break;
1115 default:
1116 printf(" ipv6cp-type-%u", type);
1117 break;
1118 }
1119
1120 if (l < sizeof(type) + sizeof(length))
1121 return (-1);
1122
1123 length = p[1];
1124
1125 p += (sizeof(type) + sizeof(length));
1126 l -= (sizeof(type) + sizeof(length));
1127
1128 switch (type) {
1129 case IPV6CP_IFID1:
1130 if (length != 10)
1131 goto invalid;
1132 if (l < 8)
1133 return (-1);
1134
1135 printf("=%04x:%04x:%04x:%04x", EXTRACT_16BITS(p + 0)((u_int16_t)*((const u_int8_t *)(p + 0) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p + 0) + 1)),
1136 EXTRACT_16BITS(p + 2)((u_int16_t)*((const u_int8_t *)(p + 2) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p + 2) + 1)), EXTRACT_16BITS(p + 4)((u_int16_t)*((const u_int8_t *)(p + 4) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p + 4) + 1)),
1137 EXTRACT_16BITS(p + 6)((u_int16_t)*((const u_int8_t *)(p + 6) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p + 6) + 1)));
1138 break;
1139 default:
1140 break;
1141 }
1142
1143 return (length);
1144invalid:
1145 printf(" invalid opt len %u", length);
1146 return (length);
1147}
1148
1149void
1150ppp_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
1151{
1152 u_int length = h->len;
1153 u_int caplen = h->caplen;
1154
1155 packetp = p;
1156 snapend = p + caplen;
1157
1158 ts_print(&h->ts);
1159
1160 ppp_hdlc_print(p, length);
1161
1162 if (xflag)
1163 default_print((const u_char *)(p + PPP_HDRLEN4),
1164 caplen - PPP_HDRLEN4);
1165
1166 putchar('\n')(!__isthreaded ? __sputc('\n', (&__sF[1])) : (putc)('\n',
(&__sF[1])));
1167}
1168
1169void
1170ppp_ether_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
1171{
1172 u_int16_t pppoe_sid, pppoe_len;
1173 u_int l = h->caplen;
1174 u_int length = h->len;
1175
1176 packetp = p;
1177 snapend = p + l;
1178
1179 ts_print(&h->ts);
1180
1181 if (eflag)
1182 printf("PPPoE ");
1183
1184 if (l < sizeof(struct pppoe_header)) {
1185 printf("[|pppoe]");
1186 return;
1187 }
1188
1189 pppoe_sid = EXTRACT_16BITS(p + 2)((u_int16_t)*((const u_int8_t *)(p + 2) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p + 2) + 1));
1190 pppoe_len = EXTRACT_16BITS(p + 4)((u_int16_t)*((const u_int8_t *)(p + 4) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p + 4) + 1));
1191
1192 if (eflag) {
1193 printf("\n\tcode ");
1194 switch (p[1]) {
1195 case PPPOE_CODE_PADI0x09:
1196 printf("Initiation");
1197 break;
1198 case PPPOE_CODE_PADO0x07:
1199 printf("Offer");
1200 break;
1201 case PPPOE_CODE_PADR0x19:
1202 printf("Request");
1203 break;
1204 case PPPOE_CODE_PADS0x65:
1205 printf("Confirm");
1206 break;
1207 case PPPOE_CODE_PADT0xa7:
1208 printf("Terminate");
1209 break;
1210 case PPPOE_CODE_SESSION0x00:
1211 printf("Session");
1212 break;
1213 default:
1214 printf("Unknown(0x%02x)", p[1]);
1215 break;
1216 }
1217 printf(", version %d, type %d, id 0x%04x, length %d\n\t",
1218 (p[0] & 0xf), (p[0] & 0xf0) >> 4, pppoe_sid, pppoe_len);
1219 }
1220
1221 if (length < pppoe_len) {
1222 printf(" truncated-pppoe - %d bytes missing!",
1223 pppoe_len - length);
1224 pppoe_len = length;
1225 }
1226
1227 ppp_print(p + sizeof(struct pppoe_header), pppoe_len);
1228
1229 if (xflag)
1230 default_print(p, h->caplen);
1231
1232 putchar('\n')(!__isthreaded ? __sputc('\n', (&__sF[1])) : (putc)('\n',
(&__sF[1])));
1233}
1234
1235int
1236pppoe_if_print(u_short ethertype, const u_char *p, u_int length, u_int l)
1237{
1238 uint16_t pppoe_sid, pppoe_len;
1239
1240 if (ethertype == ETHERTYPE_PPPOEDISC0x8863)
1241 printf("PPPoE-Discovery");
1242 else
1243 printf("PPPoE-Session");
1244
1245 if (l < sizeof(struct pppoe_header))
1246 goto trunc;
1247
1248 printf("\n\tcode ");
1249 switch (p[1]) {
1250 case PPPOE_CODE_PADI0x09:
1251 printf("Initiation");
1252 break;
1253 case PPPOE_CODE_PADO0x07:
1254 printf("Offer");
1255 break;
1256 case PPPOE_CODE_PADR0x19:
1257 printf("Request");
1258 break;
1259 case PPPOE_CODE_PADS0x65:
1260 printf("Confirm");
1261 break;
1262 case PPPOE_CODE_PADT0xa7:
1263 printf("Terminate");
1264 break;
1265 case PPPOE_CODE_SESSION0x00:
1266 printf("Session");
1267 break;
1268 default:
1269 printf("Unknown(0x%02x)", p[1]);
1270 break;
1271 }
1272
1273 pppoe_sid = EXTRACT_16BITS(p + 2)((u_int16_t)*((const u_int8_t *)(p + 2) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p + 2) + 1));
1274 pppoe_len = EXTRACT_16BITS(p + 4)((u_int16_t)*((const u_int8_t *)(p + 4) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p + 4) + 1));
1275 printf(", version %d, type %d, id 0x%04x, length %d",
1276 (p[0] & 0xf), (p[0] & 0xf0) >> 4, pppoe_sid, pppoe_len);
1277
1278 p += sizeof(struct pppoe_header);
1279 l -= sizeof(struct pppoe_header);
1280 length -= sizeof(struct pppoe_header);
1281
1282 if (length < pppoe_len) {
1283 printf(" truncated-pppoe - %d bytes missing!",
1284 pppoe_len - length);
1285 pppoe_len = length;
1286 }
1287
1288 if (l > pppoe_len)
1289 l = pppoe_len;
1290
1291 if (ethertype == ETHERTYPE_PPPOEDISC0x8863) {
1292 while (l > 0) {
1293 u_int16_t t_type, t_len;
1294
1295 if (l < 4)
1296 goto trunc;
1297 t_type = EXTRACT_16BITS(p)((u_int16_t)*((const u_int8_t *)(p) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p) + 1));
1298 t_len = EXTRACT_16BITS(p + 2)((u_int16_t)*((const u_int8_t *)(p + 2) + 0) << 8 | (u_int16_t
)*((const u_int8_t *)(p + 2) + 1));
1299
1300 p += 4;
1301 l -= 4;
1302
1303 if (l < t_len)
1304 goto trunc;
1305
1306 printf("\n\ttag ");
1307 switch (t_type) {
1308 case PPPOE_TAG_END_OF_LIST0x0000:
1309 printf("End-Of-List");
1310 break;
1311 case PPPOE_TAG_SERVICE_NAME0x0101:
1312 printf("Service-Name");
1313 break;
1314 case PPPOE_TAG_AC_NAME0x0102:
1315 printf("AC-Name");
1316 break;
1317 case PPPOE_TAG_HOST_UNIQ0x0103:
1318 printf("Host-Uniq");
1319 break;
1320 case PPPOE_TAG_AC_COOKIE0x0104:
1321 printf("AC-Cookie");
1322 break;
1323 case PPPOE_TAG_VENDOR_SPEC0x0105:
1324 printf("Vendor-Specific");
1325 break;
1326 case PPPOE_TAG_RELAY_SESSION0x0110:
1327 printf("Relay-Session");
1328 break;
1329 case PPPOE_TAG_MAX_PAYLOAD0x0120:
1330 printf("PPP-Max-Payload");
1331 break;
1332 case PPPOE_TAG_SERVICE_NAME_ERROR0x0201:
1333 printf("Service-Name-Error");
1334 break;
1335 case PPPOE_TAG_AC_SYSTEM_ERROR0x0202:
1336 printf("AC-System-Error");
1337 break;
1338 case PPPOE_TAG_GENERIC_ERROR0x0203:
1339 printf("Generic-Error");
1340 break;
1341 default:
1342 printf("Unknown(0x%04x)", t_type);
1343 }
1344 printf(", length %u%s", t_len, t_len ? " " : "");
1345
1346 if (t_len) {
1347 for (t_type = 0; t_type < t_len; t_type++) {
1348 if (isprint(p[t_type]))
1349 printf("%c", p[t_type]);
1350 else
1351 printf("\\%03o", p[t_type]);
1352 }
1353 }
1354 p += t_len;
1355 l -= t_len;
1356 }
1357 } else if (ethertype == ETHERTYPE_PPPOE0x8864) {
1358 printf("\n\t");
1359 ppp_print(p, pppoe_len);
1360 }
1361
1362 return (1);
1363
1364trunc:
1365 printf("[|pppoe]");
1366 return (1);
1367}
1368
1369void
1370ppp_hdlc_print(const u_char *p, u_int length)
1371{
1372 uint8_t address, control;
1373 int l;
1374
1375 l = snapend - p;
1376
1377 if (l < sizeof(address) + sizeof(control))
1378 goto trunc;
1379
1380 address = p[0];
1381 control = p[1];
1382
1383 p += sizeof(address) + sizeof(control);
1384 l -= sizeof(address) + sizeof(control);
1385 length -= sizeof(address) + sizeof(control);
1386
1387 switch (address) {
1388 case 0xff: /* All-Stations */
1389 if (eflag)
1390 printf("%02x %02x %u ", address, control, length);
1391
1392 if (control != 0x3) {
1393 printf(" discard");
1394 break;
1395 }
1396
1397 ppp_print(p, length);
1398 break;
1399
1400 default:
1401 printf("ppp address 0x%02x unknown", address);
1402 break;
1403 }
1404 return;
1405
1406trunc:
1407 printf("[|ppp]");
1408}
1409
1410void
1411ppp_hdlc_if_print(u_char *user, const struct pcap_pkthdr *h,
1412 const u_char *p)
1413{
1414 int l = h->caplen;
1415
1416 packetp = p;
1417 snapend = p + l;
1418
1419 ts_print(&h->ts);
1420
1421 if (eflag)
1422 printf("PPP ");
1423
1424 ppp_hdlc_print(p, h->len);
1425
1426 if (xflag)
1427 default_print(p, l);
1428
1429 printf("\n");
1430}
1431
1432#else
1433
1434#include <sys/types.h>
1435#include <sys/time.h>
1436
1437#include <stdio.h>
1438
1439#include "interface.h"
1440void
1441ppp_if_print(user, h, p)
1442 u_char *user;
1443 const struct pcap_pkthdr *h;
1444 const u_char *p;
1445{
1446 error("not configured for ppp");
1447 /* NOTREACHED */
1448}
1449#endif