1 | /* |
---|
2 | * upap.c - User/Password Authentication Protocol. |
---|
3 | * |
---|
4 | * Copyright (c) 1989 Carnegie Mellon University. |
---|
5 | * All rights reserved. |
---|
6 | * |
---|
7 | * Redistribution and use in source and binary forms are permitted |
---|
8 | * provided that the above copyright notice and this paragraph are |
---|
9 | * duplicated in all such forms and that any documentation, |
---|
10 | * advertising materials, and other materials related to such |
---|
11 | * distribution and use acknowledge that the software was developed |
---|
12 | * by Carnegie Mellon University. The name of the |
---|
13 | * University may not be used to endorse or promote products derived |
---|
14 | * from this software without specific prior written permission. |
---|
15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
---|
16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
---|
17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
---|
18 | */ |
---|
19 | |
---|
20 | #ifndef lint |
---|
21 | /* static char rcsid[] = "$Id$"; */ |
---|
22 | #endif |
---|
23 | |
---|
24 | /* |
---|
25 | * TODO: |
---|
26 | */ |
---|
27 | |
---|
28 | #include <stdio.h> |
---|
29 | #include <string.h> |
---|
30 | #include <sys/types.h> |
---|
31 | #include <sys/time.h> |
---|
32 | #include <syslog.h> |
---|
33 | |
---|
34 | #include "pppd.h" |
---|
35 | #include "upap.h" |
---|
36 | #define print_string(user, ulen, printer, arg) |
---|
37 | |
---|
38 | /* |
---|
39 | * Protocol entry points. |
---|
40 | */ |
---|
41 | static void upap_init __P((int)); |
---|
42 | static void upap_lowerup __P((int)); |
---|
43 | static void upap_lowerdown __P((int)); |
---|
44 | static void upap_input __P((int, u_char *, int)); |
---|
45 | static void upap_protrej __P((int)); |
---|
46 | static int upap_printpkt __P((u_char *, int, |
---|
47 | void (*) __P((void *, char *, ...)), void *)); |
---|
48 | |
---|
49 | struct protent pap_protent = { |
---|
50 | PPP_PAP, |
---|
51 | upap_init, |
---|
52 | upap_input, |
---|
53 | upap_protrej, |
---|
54 | upap_lowerup, |
---|
55 | upap_lowerdown, |
---|
56 | NULL, |
---|
57 | NULL, |
---|
58 | upap_printpkt, |
---|
59 | NULL, |
---|
60 | 1, |
---|
61 | "PAP", |
---|
62 | NULL, |
---|
63 | NULL, |
---|
64 | NULL |
---|
65 | }; |
---|
66 | |
---|
67 | upap_state upap[NUM_PPP]; /* UPAP state; one for each unit */ |
---|
68 | |
---|
69 | static void upap_timeout __P((void *)); |
---|
70 | static void upap_reqtimeout __P((void *)); |
---|
71 | static void upap_rauthreq __P((upap_state *, u_char *, int, int)); |
---|
72 | static void upap_rauthack __P((upap_state *, u_char *, int, int)); |
---|
73 | static void upap_rauthnak __P((upap_state *, u_char *, int, int)); |
---|
74 | static void upap_sauthreq __P((upap_state *)); |
---|
75 | static void upap_sresp __P((upap_state *, u_char, u_char, char *, int)); |
---|
76 | |
---|
77 | |
---|
78 | /* |
---|
79 | * upap_init - Initialize a UPAP unit. |
---|
80 | */ |
---|
81 | static void |
---|
82 | upap_init(unit) |
---|
83 | int unit; |
---|
84 | { |
---|
85 | upap_state *u = &upap[unit]; |
---|
86 | |
---|
87 | u->us_unit = unit; |
---|
88 | u->us_user = NULL; |
---|
89 | u->us_userlen = 0; |
---|
90 | u->us_passwd = NULL; |
---|
91 | u->us_passwdlen = 0; |
---|
92 | u->us_clientstate = UPAPCS_INITIAL; |
---|
93 | u->us_serverstate = UPAPSS_INITIAL; |
---|
94 | u->us_id = 0; |
---|
95 | u->us_timeouttime = UPAP_DEFTIMEOUT; |
---|
96 | u->us_maxtransmits = 10; |
---|
97 | u->us_reqtimeout = UPAP_DEFREQTIME; |
---|
98 | } |
---|
99 | |
---|
100 | |
---|
101 | /* |
---|
102 | * upap_authwithpeer - Authenticate us with our peer (start client). |
---|
103 | * |
---|
104 | * Set new state and send authenticate's. |
---|
105 | */ |
---|
106 | void |
---|
107 | upap_authwithpeer(unit, user, password) |
---|
108 | int unit; |
---|
109 | char *user, *password; |
---|
110 | { |
---|
111 | upap_state *u = &upap[unit]; |
---|
112 | |
---|
113 | /* Save the username and password we're given */ |
---|
114 | u->us_user = user; |
---|
115 | u->us_userlen = strlen(user); |
---|
116 | u->us_passwd = password; |
---|
117 | u->us_passwdlen = strlen(password); |
---|
118 | u->us_transmits = 0; |
---|
119 | |
---|
120 | /* Lower layer up yet? */ |
---|
121 | if (u->us_clientstate == UPAPCS_INITIAL || |
---|
122 | u->us_clientstate == UPAPCS_PENDING) { |
---|
123 | u->us_clientstate = UPAPCS_PENDING; |
---|
124 | return; |
---|
125 | } |
---|
126 | |
---|
127 | upap_sauthreq(u); /* Start protocol */ |
---|
128 | } |
---|
129 | |
---|
130 | |
---|
131 | /* |
---|
132 | * upap_authpeer - Authenticate our peer (start server). |
---|
133 | * |
---|
134 | * Set new state. |
---|
135 | */ |
---|
136 | void |
---|
137 | upap_authpeer(unit) |
---|
138 | int unit; |
---|
139 | { |
---|
140 | upap_state *u = &upap[unit]; |
---|
141 | |
---|
142 | /* Lower layer up yet? */ |
---|
143 | if (u->us_serverstate == UPAPSS_INITIAL || |
---|
144 | u->us_serverstate == UPAPSS_PENDING) { |
---|
145 | u->us_serverstate = UPAPSS_PENDING; |
---|
146 | return; |
---|
147 | } |
---|
148 | |
---|
149 | u->us_serverstate = UPAPSS_LISTEN; |
---|
150 | if (u->us_reqtimeout > 0) |
---|
151 | TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout); |
---|
152 | } |
---|
153 | |
---|
154 | |
---|
155 | /* |
---|
156 | * upap_timeout - Retransmission timer for sending auth-reqs expired. |
---|
157 | */ |
---|
158 | static void |
---|
159 | upap_timeout(arg) |
---|
160 | void *arg; |
---|
161 | { |
---|
162 | upap_state *u = (upap_state *) arg; |
---|
163 | |
---|
164 | if (u->us_clientstate != UPAPCS_AUTHREQ) |
---|
165 | return; |
---|
166 | |
---|
167 | if (u->us_transmits >= u->us_maxtransmits) { |
---|
168 | /* give up in disgust */ |
---|
169 | syslog(LOG_ERR, "No response to PAP authenticate-requests"); |
---|
170 | u->us_clientstate = UPAPCS_BADAUTH; |
---|
171 | auth_withpeer_fail(u->us_unit, PPP_PAP); |
---|
172 | return; |
---|
173 | } |
---|
174 | |
---|
175 | upap_sauthreq(u); /* Send Authenticate-Request */ |
---|
176 | } |
---|
177 | |
---|
178 | |
---|
179 | /* |
---|
180 | * upap_reqtimeout - Give up waiting for the peer to send an auth-req. |
---|
181 | */ |
---|
182 | static void |
---|
183 | upap_reqtimeout(arg) |
---|
184 | void *arg; |
---|
185 | { |
---|
186 | upap_state *u = (upap_state *) arg; |
---|
187 | |
---|
188 | if (u->us_serverstate != UPAPSS_LISTEN) |
---|
189 | return; /* huh?? */ |
---|
190 | |
---|
191 | auth_peer_fail(u->us_unit, PPP_PAP); |
---|
192 | u->us_serverstate = UPAPSS_BADAUTH; |
---|
193 | } |
---|
194 | |
---|
195 | |
---|
196 | /* |
---|
197 | * upap_lowerup - The lower layer is up. |
---|
198 | * |
---|
199 | * Start authenticating if pending. |
---|
200 | */ |
---|
201 | static void |
---|
202 | upap_lowerup(unit) |
---|
203 | int unit; |
---|
204 | { |
---|
205 | upap_state *u = &upap[unit]; |
---|
206 | |
---|
207 | if (u->us_clientstate == UPAPCS_INITIAL) |
---|
208 | u->us_clientstate = UPAPCS_CLOSED; |
---|
209 | else if (u->us_clientstate == UPAPCS_PENDING) { |
---|
210 | upap_sauthreq(u); /* send an auth-request */ |
---|
211 | } |
---|
212 | |
---|
213 | if (u->us_serverstate == UPAPSS_INITIAL) |
---|
214 | u->us_serverstate = UPAPSS_CLOSED; |
---|
215 | else if (u->us_serverstate == UPAPSS_PENDING) { |
---|
216 | u->us_serverstate = UPAPSS_LISTEN; |
---|
217 | if (u->us_reqtimeout > 0) |
---|
218 | TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout); |
---|
219 | } |
---|
220 | } |
---|
221 | |
---|
222 | |
---|
223 | /* |
---|
224 | * upap_lowerdown - The lower layer is down. |
---|
225 | * |
---|
226 | * Cancel all timeouts. |
---|
227 | */ |
---|
228 | static void |
---|
229 | upap_lowerdown(unit) |
---|
230 | int unit; |
---|
231 | { |
---|
232 | upap_state *u = &upap[unit]; |
---|
233 | |
---|
234 | if (u->us_clientstate == UPAPCS_AUTHREQ) /* Timeout pending? */ |
---|
235 | UNTIMEOUT(upap_timeout, u); /* Cancel timeout */ |
---|
236 | if (u->us_serverstate == UPAPSS_LISTEN && u->us_reqtimeout > 0) |
---|
237 | UNTIMEOUT(upap_reqtimeout, u); |
---|
238 | |
---|
239 | u->us_clientstate = UPAPCS_INITIAL; |
---|
240 | u->us_serverstate = UPAPSS_INITIAL; |
---|
241 | } |
---|
242 | |
---|
243 | |
---|
244 | /* |
---|
245 | * upap_protrej - Peer doesn't speak this protocol. |
---|
246 | * |
---|
247 | * This shouldn't happen. In any case, pretend lower layer went down. |
---|
248 | */ |
---|
249 | static void |
---|
250 | upap_protrej(unit) |
---|
251 | int unit; |
---|
252 | { |
---|
253 | upap_state *u = &upap[unit]; |
---|
254 | |
---|
255 | if (u->us_clientstate == UPAPCS_AUTHREQ) { |
---|
256 | syslog(LOG_ERR, "PAP authentication failed due to protocol-reject"); |
---|
257 | auth_withpeer_fail(unit, PPP_PAP); |
---|
258 | } |
---|
259 | if (u->us_serverstate == UPAPSS_LISTEN) { |
---|
260 | syslog(LOG_ERR, "PAP authentication of peer failed (protocol-reject)"); |
---|
261 | auth_peer_fail(unit, PPP_PAP); |
---|
262 | } |
---|
263 | upap_lowerdown(unit); |
---|
264 | } |
---|
265 | |
---|
266 | |
---|
267 | /* |
---|
268 | * upap_input - Input UPAP packet. |
---|
269 | */ |
---|
270 | static void |
---|
271 | upap_input(unit, inpacket, l) |
---|
272 | int unit; |
---|
273 | u_char *inpacket; |
---|
274 | int l; |
---|
275 | { |
---|
276 | upap_state *u = &upap[unit]; |
---|
277 | u_char *inp; |
---|
278 | u_char code, id; |
---|
279 | int len; |
---|
280 | |
---|
281 | /* |
---|
282 | * Parse header (code, id and length). |
---|
283 | * If packet too short, drop it. |
---|
284 | */ |
---|
285 | inp = inpacket; |
---|
286 | if (l < UPAP_HEADERLEN) { |
---|
287 | UPAPDEBUG((LOG_INFO, "pap_input: rcvd short header.")); |
---|
288 | return; |
---|
289 | } |
---|
290 | GETCHAR(code, inp); |
---|
291 | GETCHAR(id, inp); |
---|
292 | GETSHORT(len, inp); |
---|
293 | if (len < UPAP_HEADERLEN) { |
---|
294 | UPAPDEBUG((LOG_INFO, "pap_input: rcvd illegal length.")); |
---|
295 | return; |
---|
296 | } |
---|
297 | if (len > l) { |
---|
298 | UPAPDEBUG((LOG_INFO, "pap_input: rcvd short packet.")); |
---|
299 | return; |
---|
300 | } |
---|
301 | len -= UPAP_HEADERLEN; |
---|
302 | |
---|
303 | /* |
---|
304 | * Action depends on code. |
---|
305 | */ |
---|
306 | switch (code) { |
---|
307 | case UPAP_AUTHREQ: |
---|
308 | upap_rauthreq(u, inp, id, len); |
---|
309 | break; |
---|
310 | |
---|
311 | case UPAP_AUTHACK: |
---|
312 | upap_rauthack(u, inp, id, len); |
---|
313 | break; |
---|
314 | |
---|
315 | case UPAP_AUTHNAK: |
---|
316 | upap_rauthnak(u, inp, id, len); |
---|
317 | break; |
---|
318 | |
---|
319 | default: /* XXX Need code reject */ |
---|
320 | break; |
---|
321 | } |
---|
322 | } |
---|
323 | |
---|
324 | |
---|
325 | /* |
---|
326 | * upap_rauth - Receive Authenticate. |
---|
327 | */ |
---|
328 | static void |
---|
329 | upap_rauthreq(u, inp, id, len) |
---|
330 | upap_state *u; |
---|
331 | u_char *inp; |
---|
332 | int id; |
---|
333 | int len; |
---|
334 | { |
---|
335 | u_char ruserlen, rpasswdlen; |
---|
336 | char *ruser, *rpasswd; |
---|
337 | int retcode; |
---|
338 | char *msg; |
---|
339 | int msglen; |
---|
340 | |
---|
341 | UPAPDEBUG((LOG_INFO, "pap_rauth: Rcvd id %d.", id)); |
---|
342 | |
---|
343 | if (u->us_serverstate < UPAPSS_LISTEN) |
---|
344 | return; |
---|
345 | |
---|
346 | /* |
---|
347 | * If we receive a duplicate authenticate-request, we are |
---|
348 | * supposed to return the same status as for the first request. |
---|
349 | */ |
---|
350 | if (u->us_serverstate == UPAPSS_OPEN) { |
---|
351 | upap_sresp(u, UPAP_AUTHACK, id, "", 0); /* return auth-ack */ |
---|
352 | return; |
---|
353 | } |
---|
354 | if (u->us_serverstate == UPAPSS_BADAUTH) { |
---|
355 | upap_sresp(u, UPAP_AUTHNAK, id, "", 0); /* return auth-nak */ |
---|
356 | return; |
---|
357 | } |
---|
358 | |
---|
359 | /* |
---|
360 | * Parse user/passwd. |
---|
361 | */ |
---|
362 | if (len < sizeof (u_char)) { |
---|
363 | UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet.")); |
---|
364 | return; |
---|
365 | } |
---|
366 | GETCHAR(ruserlen, inp); |
---|
367 | len -= sizeof (u_char) + ruserlen + sizeof (u_char); |
---|
368 | if (len < 0) { |
---|
369 | UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet.")); |
---|
370 | return; |
---|
371 | } |
---|
372 | ruser = (char *) inp; |
---|
373 | INCPTR(ruserlen, inp); |
---|
374 | GETCHAR(rpasswdlen, inp); |
---|
375 | if (len < rpasswdlen) { |
---|
376 | UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet.")); |
---|
377 | return; |
---|
378 | } |
---|
379 | rpasswd = (char *) inp; |
---|
380 | |
---|
381 | /* |
---|
382 | * Check the username and password given. |
---|
383 | */ |
---|
384 | retcode = check_passwd(u->us_unit, ruser, ruserlen, rpasswd, |
---|
385 | rpasswdlen, &msg, &msglen); |
---|
386 | BZERO(rpasswd, rpasswdlen); |
---|
387 | |
---|
388 | upap_sresp(u, retcode, id, msg, msglen); |
---|
389 | |
---|
390 | if (retcode == UPAP_AUTHACK) { |
---|
391 | u->us_serverstate = UPAPSS_OPEN; |
---|
392 | auth_peer_success(u->us_unit, PPP_PAP, ruser, ruserlen); |
---|
393 | } else { |
---|
394 | u->us_serverstate = UPAPSS_BADAUTH; |
---|
395 | auth_peer_fail(u->us_unit, PPP_PAP); |
---|
396 | } |
---|
397 | |
---|
398 | if (u->us_reqtimeout > 0) |
---|
399 | UNTIMEOUT(upap_reqtimeout, u); |
---|
400 | } |
---|
401 | |
---|
402 | |
---|
403 | /* |
---|
404 | * upap_rauthack - Receive Authenticate-Ack. |
---|
405 | */ |
---|
406 | static void |
---|
407 | upap_rauthack(u, inp, id, len) |
---|
408 | upap_state *u; |
---|
409 | u_char *inp; |
---|
410 | int id; |
---|
411 | int len; |
---|
412 | { |
---|
413 | u_char msglen; |
---|
414 | char *msg; |
---|
415 | |
---|
416 | UPAPDEBUG((LOG_INFO, "pap_rauthack: Rcvd id %d.", id)); |
---|
417 | if (u->us_clientstate != UPAPCS_AUTHREQ) /* XXX */ |
---|
418 | return; |
---|
419 | |
---|
420 | /* |
---|
421 | * Parse message. |
---|
422 | */ |
---|
423 | if (len < sizeof (u_char)) { |
---|
424 | UPAPDEBUG((LOG_INFO, "pap_rauthack: rcvd short packet.")); |
---|
425 | return; |
---|
426 | } |
---|
427 | GETCHAR(msglen, inp); |
---|
428 | len -= sizeof (u_char); |
---|
429 | if (len < msglen) { |
---|
430 | UPAPDEBUG((LOG_INFO, "pap_rauthack: rcvd short packet.")); |
---|
431 | return; |
---|
432 | } |
---|
433 | msg = (char *) inp; |
---|
434 | PRINTMSG(msg, msglen); |
---|
435 | |
---|
436 | u->us_clientstate = UPAPCS_OPEN; |
---|
437 | |
---|
438 | auth_withpeer_success(u->us_unit, PPP_PAP); |
---|
439 | } |
---|
440 | |
---|
441 | |
---|
442 | /* |
---|
443 | * upap_rauthnak - Receive Authenticate-Nakk. |
---|
444 | */ |
---|
445 | static void |
---|
446 | upap_rauthnak(u, inp, id, len) |
---|
447 | upap_state *u; |
---|
448 | u_char *inp; |
---|
449 | int id; |
---|
450 | int len; |
---|
451 | { |
---|
452 | u_char msglen; |
---|
453 | char *msg; |
---|
454 | |
---|
455 | UPAPDEBUG((LOG_INFO, "pap_rauthnak: Rcvd id %d.", id)); |
---|
456 | if (u->us_clientstate != UPAPCS_AUTHREQ) /* XXX */ |
---|
457 | return; |
---|
458 | |
---|
459 | /* |
---|
460 | * Parse message. |
---|
461 | */ |
---|
462 | if (len < sizeof (u_char)) { |
---|
463 | UPAPDEBUG((LOG_INFO, "pap_rauthnak: rcvd short packet.")); |
---|
464 | return; |
---|
465 | } |
---|
466 | GETCHAR(msglen, inp); |
---|
467 | len -= sizeof (u_char); |
---|
468 | if (len < msglen) { |
---|
469 | UPAPDEBUG((LOG_INFO, "pap_rauthnak: rcvd short packet.")); |
---|
470 | return; |
---|
471 | } |
---|
472 | msg = (char *) inp; |
---|
473 | PRINTMSG(msg, msglen); |
---|
474 | |
---|
475 | u->us_clientstate = UPAPCS_BADAUTH; |
---|
476 | |
---|
477 | syslog(LOG_ERR, "PAP authentication failed"); |
---|
478 | auth_withpeer_fail(u->us_unit, PPP_PAP); |
---|
479 | } |
---|
480 | |
---|
481 | |
---|
482 | /* |
---|
483 | * upap_sauthreq - Send an Authenticate-Request. |
---|
484 | */ |
---|
485 | static void |
---|
486 | upap_sauthreq(u) |
---|
487 | upap_state *u; |
---|
488 | { |
---|
489 | u_char *outp; |
---|
490 | int outlen; |
---|
491 | |
---|
492 | outlen = UPAP_HEADERLEN + 2 * sizeof (u_char) + |
---|
493 | u->us_userlen + u->us_passwdlen; |
---|
494 | outp = outpacket_buf; |
---|
495 | |
---|
496 | MAKEHEADER(outp, PPP_PAP); |
---|
497 | |
---|
498 | PUTCHAR(UPAP_AUTHREQ, outp); |
---|
499 | PUTCHAR(++u->us_id, outp); |
---|
500 | PUTSHORT(outlen, outp); |
---|
501 | PUTCHAR(u->us_userlen, outp); |
---|
502 | BCOPY(u->us_user, outp, u->us_userlen); |
---|
503 | INCPTR(u->us_userlen, outp); |
---|
504 | PUTCHAR(u->us_passwdlen, outp); |
---|
505 | BCOPY(u->us_passwd, outp, u->us_passwdlen); |
---|
506 | |
---|
507 | output(u->us_unit, outpacket_buf, outlen + PPP_HDRLEN); |
---|
508 | |
---|
509 | UPAPDEBUG((LOG_INFO, "pap_sauth: Sent id %d.", u->us_id)); |
---|
510 | |
---|
511 | TIMEOUT(upap_timeout, u, u->us_timeouttime); |
---|
512 | ++u->us_transmits; |
---|
513 | u->us_clientstate = UPAPCS_AUTHREQ; |
---|
514 | } |
---|
515 | |
---|
516 | |
---|
517 | /* |
---|
518 | * upap_sresp - Send a response (ack or nak). |
---|
519 | */ |
---|
520 | static void |
---|
521 | upap_sresp(u, code, id, msg, msglen) |
---|
522 | upap_state *u; |
---|
523 | u_char code, id; |
---|
524 | char *msg; |
---|
525 | int msglen; |
---|
526 | { |
---|
527 | u_char *outp; |
---|
528 | int outlen; |
---|
529 | |
---|
530 | outlen = UPAP_HEADERLEN + sizeof (u_char) + msglen; |
---|
531 | outp = outpacket_buf; |
---|
532 | MAKEHEADER(outp, PPP_PAP); |
---|
533 | |
---|
534 | PUTCHAR(code, outp); |
---|
535 | PUTCHAR(id, outp); |
---|
536 | PUTSHORT(outlen, outp); |
---|
537 | PUTCHAR(msglen, outp); |
---|
538 | BCOPY(msg, outp, msglen); |
---|
539 | output(u->us_unit, outpacket_buf, outlen + PPP_HDRLEN); |
---|
540 | |
---|
541 | UPAPDEBUG((LOG_INFO, "pap_sresp: Sent code %d, id %d.", code, id)); |
---|
542 | } |
---|
543 | |
---|
544 | /* |
---|
545 | * upap_printpkt - print the contents of a PAP packet. |
---|
546 | */ |
---|
547 | static char *upap_codenames[] = { |
---|
548 | "AuthReq", "AuthAck", "AuthNak" |
---|
549 | }; |
---|
550 | |
---|
551 | static int |
---|
552 | upap_printpkt(p, plen, printer, arg) |
---|
553 | u_char *p; |
---|
554 | int plen; |
---|
555 | void (*printer) __P((void *, char *, ...)); |
---|
556 | void *arg; |
---|
557 | { |
---|
558 | int code, id, len; |
---|
559 | int mlen, ulen, wlen; |
---|
560 | char *user, *pwd, *msg; |
---|
561 | u_char *pstart; |
---|
562 | |
---|
563 | if (plen < UPAP_HEADERLEN) |
---|
564 | return 0; |
---|
565 | pstart = p; |
---|
566 | GETCHAR(code, p); |
---|
567 | GETCHAR(id, p); |
---|
568 | GETSHORT(len, p); |
---|
569 | if (len < UPAP_HEADERLEN || len > plen) |
---|
570 | return 0; |
---|
571 | |
---|
572 | if (code >= 1 && code <= sizeof(upap_codenames) / sizeof(char *)) |
---|
573 | printer(arg, " %s", upap_codenames[code-1]); |
---|
574 | else |
---|
575 | printer(arg, " code=0x%x", code); |
---|
576 | printer(arg, " id=0x%x", id); |
---|
577 | len -= UPAP_HEADERLEN; |
---|
578 | switch (code) { |
---|
579 | case UPAP_AUTHREQ: |
---|
580 | if (len < 1) |
---|
581 | break; |
---|
582 | ulen = p[0]; |
---|
583 | if (len < ulen + 2) |
---|
584 | break; |
---|
585 | wlen = p[ulen + 1]; |
---|
586 | if (len < ulen + wlen + 2) |
---|
587 | break; |
---|
588 | user = (char *) (p + 1); |
---|
589 | pwd = (char *) (p + ulen + 2); |
---|
590 | p += ulen + wlen + 2; |
---|
591 | len -= ulen + wlen + 2; |
---|
592 | printer(arg, " user="); |
---|
593 | print_string(user, ulen, printer, arg); |
---|
594 | printer(arg, " password="); |
---|
595 | print_string(pwd, wlen, printer, arg); |
---|
596 | break; |
---|
597 | case UPAP_AUTHACK: |
---|
598 | case UPAP_AUTHNAK: |
---|
599 | if (len < 1) |
---|
600 | break; |
---|
601 | mlen = p[0]; |
---|
602 | if (len < mlen + 1) |
---|
603 | break; |
---|
604 | msg = (char *) (p + 1); |
---|
605 | p += mlen + 1; |
---|
606 | len -= mlen + 1; |
---|
607 | printer(arg, " "); |
---|
608 | print_string(msg, mlen, printer, arg); |
---|
609 | break; |
---|
610 | } |
---|
611 | |
---|
612 | /* print the rest of the bytes in the packet */ |
---|
613 | for (; len > 0; --len) { |
---|
614 | GETCHAR(code, p); |
---|
615 | printer(arg, " %.2x", code); |
---|
616 | } |
---|
617 | |
---|
618 | return p - pstart; |
---|
619 | } |
---|