1 /*** WARNING - THIS HAS NEVER BEEN FINISHED ***/
2 /*****************************************************************************
3 * chap.c - Network Challenge Handshake Authentication Protocol program file.
5 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
6 * portions Copyright (c) 1997 by Global Election Systems Inc.
8 * The authors hereby grant permission to use, copy, modify, distribute,
9 * and license this software and its documentation for any purpose, provided
10 * that existing copyright notices are retained in all copies and that this
11 * notice and the following disclaimer are included verbatim in any
12 * distributions. No written agreement, license, or royalty fee is required
13 * for any of the authorized uses.
15 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 ******************************************************************************
29 * 03-01-01 Marc Boucher <marc@mbsi.ca>
31 * 97-12-04 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
32 * Original based on BSD chap.c.
33 *****************************************************************************/
35 * chap.c - Challenge Handshake Authentication Protocol.
37 * Copyright (c) 1993 The Australian National University.
38 * All rights reserved.
40 * Redistribution and use in source and binary forms are permitted
41 * provided that the above copyright notice and this paragraph are
42 * duplicated in all such forms and that any documentation,
43 * advertising materials, and other materials related to such
44 * distribution and use acknowledge that the software was developed
45 * by the Australian National University. The name of the University
46 * may not be used to endorse or promote products derived from this
47 * software without specific prior written permission.
48 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
49 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
50 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
52 * Copyright (c) 1991 Gregory M. Christy.
53 * All rights reserved.
55 * Redistribution and use in source and binary forms are permitted
56 * provided that the above copyright notice and this paragraph are
57 * duplicated in all such forms and that any documentation,
58 * advertising materials, and other materials related to such
59 * distribution and use acknowledge that the software was developed
60 * by Gregory M. Christy. The name of the author may not be used to
61 * endorse or promote products derived from this software without
62 * specific prior written permission.
64 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
65 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
66 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
71 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
73 #if CHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
87 /*************************/
88 /*** LOCAL DEFINITIONS ***/
89 /*************************/
92 /************************/
93 /*** LOCAL DATA TYPES ***/
94 /************************/
97 /***********************************/
98 /*** LOCAL FUNCTION DECLARATIONS ***/
99 /***********************************/
101 * Protocol entry points.
103 static void ChapInit (int);
104 static void ChapLowerUp (int);
105 static void ChapLowerDown (int);
106 static void ChapInput (int, u_char *, int);
107 static void ChapProtocolReject (int);
109 static int ChapPrintPkt (u_char *, int, void (*) (void *, char *, ...), void *);
112 static void ChapChallengeTimeout (void *);
113 static void ChapResponseTimeout (void *);
114 static void ChapReceiveChallenge (chap_state *, u_char *, int, int);
115 static void ChapRechallenge (void *);
116 static void ChapReceiveResponse (chap_state *, u_char *, int, int);
117 static void ChapReceiveSuccess(chap_state *cstate, u_char *inp, u_char id, int len);
118 static void ChapReceiveFailure(chap_state *cstate, u_char *inp, u_char id, int len);
119 static void ChapSendStatus (chap_state *, int);
120 static void ChapSendChallenge (chap_state *);
121 static void ChapSendResponse (chap_state *);
122 static void ChapGenChallenge (chap_state *);
125 /******************************/
126 /*** PUBLIC DATA STRUCTURES ***/
127 /******************************/
128 chap_state chap[NUM_PPP]; /* CHAP state; one for each unit */
130 struct protent chap_protent = {
153 /***********************************/
154 /*** PUBLIC FUNCTION DEFINITIONS ***/
155 /***********************************/
157 * ChapAuthWithPeer - Authenticate us with our peer (start client).
161 ChapAuthWithPeer(int unit, char *our_name, int digest)
163 chap_state *cstate = &chap[unit];
165 cstate->resp_name = our_name;
166 cstate->resp_type = digest;
168 if (cstate->clientstate == CHAPCS_INITIAL ||
169 cstate->clientstate == CHAPCS_PENDING) {
170 /* lower layer isn't up - wait until later */
171 cstate->clientstate = CHAPCS_PENDING;
176 * We get here as a result of LCP coming up.
177 * So even if CHAP was open before, we will
178 * have to re-authenticate ourselves.
180 cstate->clientstate = CHAPCS_LISTEN;
185 * ChapAuthPeer - Authenticate our peer (start server).
188 ChapAuthPeer(int unit, char *our_name, int digest)
190 chap_state *cstate = &chap[unit];
192 cstate->chal_name = our_name;
193 cstate->chal_type = digest;
195 if (cstate->serverstate == CHAPSS_INITIAL ||
196 cstate->serverstate == CHAPSS_PENDING) {
197 /* lower layer isn't up - wait until later */
198 cstate->serverstate = CHAPSS_PENDING;
202 ChapGenChallenge(cstate);
203 ChapSendChallenge(cstate); /* crank it up dude! */
204 cstate->serverstate = CHAPSS_INITIAL_CHAL;
208 /**********************************/
209 /*** LOCAL FUNCTION DEFINITIONS ***/
210 /**********************************/
212 * ChapInit - Initialize a CHAP unit.
217 chap_state *cstate = &chap[unit];
219 BZERO(cstate, sizeof(*cstate));
221 cstate->clientstate = CHAPCS_INITIAL;
222 cstate->serverstate = CHAPSS_INITIAL;
223 cstate->timeouttime = CHAP_DEFTIMEOUT;
224 cstate->max_transmits = CHAP_DEFTRANSMITS;
225 /* random number generator is initialized in magic_init */
230 * ChapChallengeTimeout - Timeout expired on sending challenge.
233 ChapChallengeTimeout(void *arg)
235 chap_state *cstate = (chap_state *) arg;
237 /* if we aren't sending challenges, don't worry. then again we */
238 /* probably shouldn't be here either */
239 if (cstate->serverstate != CHAPSS_INITIAL_CHAL &&
240 cstate->serverstate != CHAPSS_RECHALLENGE) {
244 if (cstate->chal_transmits >= cstate->max_transmits) {
245 /* give up on peer */
246 CHAPDEBUG((LOG_ERR, "Peer failed to respond to CHAP challenge\n"));
247 cstate->serverstate = CHAPSS_BADAUTH;
248 auth_peer_fail(cstate->unit, PPP_CHAP);
252 ChapSendChallenge(cstate); /* Re-send challenge */
257 * ChapResponseTimeout - Timeout expired on sending response.
260 ChapResponseTimeout(void *arg)
262 chap_state *cstate = (chap_state *) arg;
264 /* if we aren't sending a response, don't worry. */
265 if (cstate->clientstate != CHAPCS_RESPONSE) {
269 ChapSendResponse(cstate); /* re-send response */
274 * ChapRechallenge - Time to challenge the peer again.
277 ChapRechallenge(void *arg)
279 chap_state *cstate = (chap_state *) arg;
281 /* if we aren't sending a response, don't worry. */
282 if (cstate->serverstate != CHAPSS_OPEN) {
286 ChapGenChallenge(cstate);
287 ChapSendChallenge(cstate);
288 cstate->serverstate = CHAPSS_RECHALLENGE;
293 * ChapLowerUp - The lower layer is up.
295 * Start up if we have pending requests.
298 ChapLowerUp(int unit)
300 chap_state *cstate = &chap[unit];
302 if (cstate->clientstate == CHAPCS_INITIAL) {
303 cstate->clientstate = CHAPCS_CLOSED;
304 } else if (cstate->clientstate == CHAPCS_PENDING) {
305 cstate->clientstate = CHAPCS_LISTEN;
308 if (cstate->serverstate == CHAPSS_INITIAL) {
309 cstate->serverstate = CHAPSS_CLOSED;
310 } else if (cstate->serverstate == CHAPSS_PENDING) {
311 ChapGenChallenge(cstate);
312 ChapSendChallenge(cstate);
313 cstate->serverstate = CHAPSS_INITIAL_CHAL;
319 * ChapLowerDown - The lower layer is down.
321 * Cancel all timeouts.
324 ChapLowerDown(int unit)
326 chap_state *cstate = &chap[unit];
328 /* Timeout(s) pending? Cancel if so. */
329 if (cstate->serverstate == CHAPSS_INITIAL_CHAL ||
330 cstate->serverstate == CHAPSS_RECHALLENGE) {
331 UNTIMEOUT(ChapChallengeTimeout, cstate);
332 } else if (cstate->serverstate == CHAPSS_OPEN
333 && cstate->chal_interval != 0) {
334 UNTIMEOUT(ChapRechallenge, cstate);
336 if (cstate->clientstate == CHAPCS_RESPONSE) {
337 UNTIMEOUT(ChapResponseTimeout, cstate);
339 cstate->clientstate = CHAPCS_INITIAL;
340 cstate->serverstate = CHAPSS_INITIAL;
345 * ChapProtocolReject - Peer doesn't grok CHAP.
348 ChapProtocolReject(int unit)
350 chap_state *cstate = &chap[unit];
352 if (cstate->serverstate != CHAPSS_INITIAL &&
353 cstate->serverstate != CHAPSS_CLOSED) {
354 auth_peer_fail(unit, PPP_CHAP);
356 if (cstate->clientstate != CHAPCS_INITIAL &&
357 cstate->clientstate != CHAPCS_CLOSED) {
358 auth_withpeer_fail(unit, PPP_CHAP);
360 ChapLowerDown(unit); /* shutdown chap */
365 * ChapInput - Input CHAP packet.
368 ChapInput(int unit, u_char *inpacket, int packet_len)
370 chap_state *cstate = &chap[unit];
376 * Parse header (code, id and length).
377 * If packet too short, drop it.
380 if (packet_len < CHAP_HEADERLEN) {
381 CHAPDEBUG((LOG_INFO, "ChapInput: rcvd short header.\n"));
387 if (len < CHAP_HEADERLEN) {
388 CHAPDEBUG((LOG_INFO, "ChapInput: rcvd illegal length.\n"));
391 if (len > packet_len) {
392 CHAPDEBUG((LOG_INFO, "ChapInput: rcvd short packet.\n"));
395 len -= CHAP_HEADERLEN;
398 * Action depends on code (as in fact it usually does :-).
402 ChapReceiveChallenge(cstate, inp, id, len);
406 ChapReceiveResponse(cstate, inp, id, len);
410 ChapReceiveFailure(cstate, inp, id, len);
414 ChapReceiveSuccess(cstate, inp, id, len);
417 default: /* Need code reject? */
418 CHAPDEBUG((LOG_WARNING, "Unknown CHAP code (%d) received.\n", code));
425 * ChapReceiveChallenge - Receive Challenge and send Response.
428 ChapReceiveChallenge(chap_state *cstate, u_char *inp, int id, int len)
433 char secret[MAXSECRETLEN];
436 u_char hash[MD5_SIGNATURE_SIZE];
438 CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: Rcvd id %d.\n", id));
439 if (cstate->clientstate == CHAPCS_CLOSED ||
440 cstate->clientstate == CHAPCS_PENDING) {
441 CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: in state %d\n",
442 cstate->clientstate));
447 CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: rcvd short packet.\n"));
451 GETCHAR(rchallenge_len, inp);
452 len -= sizeof (u_char) + rchallenge_len; /* now name field length */
454 CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: rcvd short packet.\n"));
458 INCPTR(rchallenge_len, inp);
460 if (len >= sizeof(rhostname)) {
461 len = sizeof(rhostname) - 1;
463 BCOPY(inp, rhostname, len);
464 rhostname[len] = '\000';
466 CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: received name field '%s'\n", rhostname));
468 /* Microsoft doesn't send their name back in the PPP packet */
469 if (ppp_settings.remote_name[0] != 0 && (ppp_settings.explicit_remote || rhostname[0] == 0)) {
470 strncpy(rhostname, ppp_settings.remote_name, sizeof(rhostname));
471 rhostname[sizeof(rhostname) - 1] = 0;
472 CHAPDEBUG((LOG_INFO, "ChapReceiveChallenge: using '%s' as remote name\n", rhostname));
475 /* get secret for authenticating ourselves with the specified host */
476 if (!get_secret(cstate->unit, cstate->resp_name, rhostname, secret, &secret_len, 0)) {
477 secret_len = 0; /* assume null secret if can't find one */
478 CHAPDEBUG((LOG_WARNING, "No CHAP secret found for authenticating us to %s\n", rhostname));
481 /* cancel response send timeout if necessary */
482 if (cstate->clientstate == CHAPCS_RESPONSE) {
483 UNTIMEOUT(ChapResponseTimeout, cstate);
486 cstate->resp_id = id;
487 cstate->resp_transmits = 0;
489 /* generate MD based on negotiated type */
490 switch (cstate->resp_type) {
492 case CHAP_DIGEST_MD5:
494 MD5Update(&mdContext, &cstate->resp_id, 1);
495 MD5Update(&mdContext, (u_char*)secret, secret_len);
496 MD5Update(&mdContext, rchallenge, rchallenge_len);
497 MD5Final(hash, &mdContext);
498 BCOPY(hash, cstate->response, MD5_SIGNATURE_SIZE);
499 cstate->resp_length = MD5_SIGNATURE_SIZE;
504 ChapMS(cstate, rchallenge, rchallenge_len, secret, secret_len);
509 CHAPDEBUG((LOG_INFO, "unknown digest type %d\n", cstate->resp_type));
513 BZERO(secret, sizeof(secret));
514 ChapSendResponse(cstate);
519 * ChapReceiveResponse - Receive and process response.
522 ChapReceiveResponse(chap_state *cstate, u_char *inp, int id, int len)
524 u_char *remmd, remmd_len;
525 int secret_len, old_state;
529 char secret[MAXSECRETLEN];
530 u_char hash[MD5_SIGNATURE_SIZE];
532 CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: Rcvd id %d.\n", id));
534 if (cstate->serverstate == CHAPSS_CLOSED ||
535 cstate->serverstate == CHAPSS_PENDING) {
536 CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: in state %d\n",
537 cstate->serverstate));
541 if (id != cstate->chal_id) {
542 return; /* doesn't match ID of last challenge */
546 * If we have received a duplicate or bogus Response,
547 * we have to send the same answer (Success/Failure)
548 * as we did for the first Response we saw.
550 if (cstate->serverstate == CHAPSS_OPEN) {
551 ChapSendStatus(cstate, CHAP_SUCCESS);
554 if (cstate->serverstate == CHAPSS_BADAUTH) {
555 ChapSendStatus(cstate, CHAP_FAILURE);
560 CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: rcvd short packet.\n"));
563 GETCHAR(remmd_len, inp); /* get length of MD */
564 remmd = inp; /* get pointer to MD */
565 INCPTR(remmd_len, inp);
567 len -= sizeof (u_char) + remmd_len;
569 CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: rcvd short packet.\n"));
573 UNTIMEOUT(ChapChallengeTimeout, cstate);
575 if (len >= sizeof(rhostname)) {
576 len = sizeof(rhostname) - 1;
578 BCOPY(inp, rhostname, len);
579 rhostname[len] = '\000';
581 CHAPDEBUG((LOG_INFO, "ChapReceiveResponse: received name field: %s\n", rhostname));
584 * Get secret for authenticating them with us,
585 * do the hash ourselves, and compare the result.
588 if (!get_secret(cstate->unit, rhostname, cstate->chal_name, secret, &secret_len, 1)) {
589 /* CHAPDEBUG((LOG_WARNING, TL_CHAP, "No CHAP secret found for authenticating %s\n", rhostname)); */
590 CHAPDEBUG((LOG_WARNING, "No CHAP secret found for authenticating %s\n",
593 /* generate MD based on negotiated type */
594 switch (cstate->chal_type) {
596 case CHAP_DIGEST_MD5: /* only MD5 is defined for now */
597 if (remmd_len != MD5_SIGNATURE_SIZE) {
598 break; /* it's not even the right length */
601 MD5Update(&mdContext, &cstate->chal_id, 1);
602 MD5Update(&mdContext, (u_char*)secret, secret_len);
603 MD5Update(&mdContext, cstate->challenge, cstate->chal_len);
604 MD5Final(hash, &mdContext);
606 /* compare local and remote MDs and send the appropriate status */
607 if (memcmp (hash, remmd, MD5_SIGNATURE_SIZE) == 0) {
608 code = CHAP_SUCCESS; /* they are the same! */
613 CHAPDEBUG((LOG_INFO, "unknown digest type %d\n", cstate->chal_type));
617 BZERO(secret, sizeof(secret));
618 ChapSendStatus(cstate, code);
620 if (code == CHAP_SUCCESS) {
621 old_state = cstate->serverstate;
622 cstate->serverstate = CHAPSS_OPEN;
623 if (old_state == CHAPSS_INITIAL_CHAL) {
624 auth_peer_success(cstate->unit, PPP_CHAP, rhostname, len);
626 if (cstate->chal_interval != 0) {
627 TIMEOUT(ChapRechallenge, cstate, cstate->chal_interval);
630 CHAPDEBUG((LOG_ERR, "CHAP peer authentication failed\n"));
631 cstate->serverstate = CHAPSS_BADAUTH;
632 auth_peer_fail(cstate->unit, PPP_CHAP);
637 * ChapReceiveSuccess - Receive Success
640 ChapReceiveSuccess(chap_state *cstate, u_char *inp, u_char id, int len)
643 LWIP_UNUSED_ARG(inp);
645 CHAPDEBUG((LOG_INFO, "ChapReceiveSuccess: Rcvd id %d.\n", id));
647 if (cstate->clientstate == CHAPCS_OPEN) {
648 /* presumably an answer to a duplicate response */
652 if (cstate->clientstate != CHAPCS_RESPONSE) {
653 /* don't know what this is */
654 CHAPDEBUG((LOG_INFO, "ChapReceiveSuccess: in state %d\n", cstate->clientstate));
658 UNTIMEOUT(ChapResponseTimeout, cstate);
667 cstate->clientstate = CHAPCS_OPEN;
669 auth_withpeer_success(cstate->unit, PPP_CHAP);
674 * ChapReceiveFailure - Receive failure.
677 ChapReceiveFailure(chap_state *cstate, u_char *inp, u_char id, int len)
680 LWIP_UNUSED_ARG(inp);
682 CHAPDEBUG((LOG_INFO, "ChapReceiveFailure: Rcvd id %d.\n", id));
684 if (cstate->clientstate != CHAPCS_RESPONSE) {
685 /* don't know what this is */
686 CHAPDEBUG((LOG_INFO, "ChapReceiveFailure: in state %d\n", cstate->clientstate));
690 UNTIMEOUT(ChapResponseTimeout, cstate);
699 CHAPDEBUG((LOG_ERR, "CHAP authentication failed\n"));
700 auth_withpeer_fail(cstate->unit, PPP_CHAP);
705 * ChapSendChallenge - Send an Authenticate challenge.
708 ChapSendChallenge(chap_state *cstate)
711 int chal_len, name_len;
714 chal_len = cstate->chal_len;
715 name_len = strlen(cstate->chal_name);
716 outlen = CHAP_HEADERLEN + sizeof (u_char) + chal_len + name_len;
717 outp = outpacket_buf[cstate->unit];
719 MAKEHEADER(outp, PPP_CHAP); /* paste in a CHAP header */
721 PUTCHAR(CHAP_CHALLENGE, outp);
722 PUTCHAR(cstate->chal_id, outp);
723 PUTSHORT(outlen, outp);
725 PUTCHAR(chal_len, outp); /* put length of challenge */
726 BCOPY(cstate->challenge, outp, chal_len);
727 INCPTR(chal_len, outp);
729 BCOPY(cstate->chal_name, outp, name_len); /* append hostname */
731 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
733 CHAPDEBUG((LOG_INFO, "ChapSendChallenge: Sent id %d.\n", cstate->chal_id));
735 TIMEOUT(ChapChallengeTimeout, cstate, cstate->timeouttime);
736 ++cstate->chal_transmits;
741 * ChapSendStatus - Send a status response (ack or nak).
744 ChapSendStatus(chap_state *cstate, int code)
750 if (code == CHAP_SUCCESS) {
751 strcpy(msg, "Welcome!");
753 strcpy(msg, "I don't like you. Go 'way.");
755 msglen = strlen(msg);
757 outlen = CHAP_HEADERLEN + msglen;
758 outp = outpacket_buf[cstate->unit];
760 MAKEHEADER(outp, PPP_CHAP); /* paste in a header */
763 PUTCHAR(cstate->chal_id, outp);
764 PUTSHORT(outlen, outp);
765 BCOPY(msg, outp, msglen);
766 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
768 CHAPDEBUG((LOG_INFO, "ChapSendStatus: Sent code %d, id %d.\n", code, cstate->chal_id));
772 * ChapGenChallenge is used to generate a pseudo-random challenge string of
773 * a pseudo-random length between min_len and max_len. The challenge
774 * string and its length are stored in *cstate, and various other fields of
775 * *cstate are initialized.
779 ChapGenChallenge(chap_state *cstate)
782 u_char *ptr = cstate->challenge;
785 /* pick a random challenge length between MIN_CHALLENGE_LENGTH and
786 MAX_CHALLENGE_LENGTH */
787 chal_len = (unsigned)
789 (MAX_CHALLENGE_LENGTH - MIN_CHALLENGE_LENGTH)) >> 16)
790 + MIN_CHALLENGE_LENGTH);
791 cstate->chal_len = chal_len;
792 cstate->chal_id = ++cstate->id;
793 cstate->chal_transmits = 0;
795 /* generate a random string */
796 for (i = 0; i < chal_len; i++ ) {
797 *ptr++ = (char) (magic() & 0xff);
802 * ChapSendResponse - send a response packet with values as specified
807 ChapSendResponse(chap_state *cstate)
810 int outlen, md_len, name_len;
812 md_len = cstate->resp_length;
813 name_len = strlen(cstate->resp_name);
814 outlen = CHAP_HEADERLEN + sizeof (u_char) + md_len + name_len;
815 outp = outpacket_buf[cstate->unit];
817 MAKEHEADER(outp, PPP_CHAP);
819 PUTCHAR(CHAP_RESPONSE, outp); /* we are a response */
820 PUTCHAR(cstate->resp_id, outp); /* copy id from challenge packet */
821 PUTSHORT(outlen, outp); /* packet length */
823 PUTCHAR(md_len, outp); /* length of MD */
824 BCOPY(cstate->response, outp, md_len); /* copy MD to buffer */
825 INCPTR(md_len, outp);
827 BCOPY(cstate->resp_name, outp, name_len); /* append our name */
829 /* send the packet */
830 pppWrite(cstate->unit, outpacket_buf[cstate->unit], outlen + PPP_HDRLEN);
832 cstate->clientstate = CHAPCS_RESPONSE;
833 TIMEOUT(ChapResponseTimeout, cstate, cstate->timeouttime);
834 ++cstate->resp_transmits;
838 static char *ChapCodenames[] = {
839 "Challenge", "Response", "Success", "Failure"
842 * ChapPrintPkt - print the contents of a CHAP packet.
845 ChapPrintPkt( u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg)
851 if (plen < CHAP_HEADERLEN) {
857 if (len < CHAP_HEADERLEN || len > plen) {
860 if (code >= 1 && code <= sizeof(ChapCodenames) / sizeof(char *)) {
861 printer(arg, " %s", ChapCodenames[code-1]);
863 printer(arg, " code=0x%x", code);
865 printer(arg, " id=0x%x", id);
866 len -= CHAP_HEADERLEN;
874 if (len < clen + 1) {
878 nlen = len - clen - 1;
880 for (; clen > 0; --clen) {
882 printer(arg, "%.2x", x);
884 printer(arg, ">, name = %.*Z", nlen, p);
888 printer(arg, " %.*Z", len, p);
891 for (clen = len; clen > 0; --clen) {
893 printer(arg, " %.2x", x);
897 return len + CHAP_HEADERLEN;
901 #endif /* CHAP_SUPPORT */
903 #endif /* PPP_SUPPORT */