File: | src/usr.sbin/npppd/npppd/ccp.c |
Warning: | line 127, column 2 Value stored to 'lnak' is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
1 | /* $OpenBSD: ccp.c,v 1.8 2019/02/27 04:52:19 denis Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2009 Internet Initiative Japan Inc. |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
26 | * SUCH DAMAGE. |
27 | */ |
28 | /**@file |
29 | * This file provides functions for CCP (Compression Control Protocol). |
30 | * MPPE is supported as a CCP option. |
31 | * $Id: ccp.c,v 1.8 2019/02/27 04:52:19 denis Exp $ |
32 | */ |
33 | #include <sys/types.h> |
34 | #include <sys/socket.h> |
35 | #include <sys/time.h> |
36 | #include <net/if_dl.h> |
37 | #include <netinet/in.h> |
38 | #include <stdlib.h> |
39 | #include <stdio.h> |
40 | #include <syslog.h> |
41 | #include <string.h> |
42 | #include <event.h> |
43 | |
44 | #include "npppd.h" |
45 | #include "fsm.h" |
46 | |
47 | #ifdef CCP_DEBUG |
48 | #define CCPDEBUG(x) fsm_log(x) |
49 | #define CCP_ASSERT(x) ASSERT(x) |
50 | #else |
51 | #define CCPDEBUG(x) |
52 | #define CCP_ASSERT(x) |
53 | #endif |
54 | |
55 | static int ccp_reqci (fsm *, u_char *, int *, int); |
56 | static void ccp_open (fsm *); |
57 | static void ccp_close (fsm *); |
58 | static void ccp_start (fsm *); |
59 | static void ccp_stop (fsm *); |
60 | static void ccp_resetci (fsm *); |
61 | static int ccp_cilen (fsm *); |
62 | static void ccp_addci (fsm *, u_char *, int *); |
63 | static int ccp_ackci (fsm *, u_char *, int); |
64 | static int ccp_rejci (fsm *, u_char *, int); |
65 | static int ccp_nakci (fsm *, u_char *, int); |
66 | static int ccp_nackackci (fsm *, u_char *, int, int, int); |
67 | static int ccp_ext (fsm *, int, int, u_char *, int); |
68 | |
69 | static struct fsm_callbacks ccp_callbacks = { |
70 | .cilen = ccp_cilen, |
71 | .resetci = ccp_resetci, |
72 | .addci = ccp_addci, |
73 | .ackci = ccp_ackci, |
74 | .nakci = ccp_nakci, |
75 | .rejci = ccp_rejci, |
76 | .reqci = ccp_reqci, |
77 | .up = ccp_open, |
78 | .down = ccp_close, |
79 | .starting = ccp_start, |
80 | .finished = ccp_stop, |
81 | .extcode = ccp_ext, |
82 | .proto_name = "ccp", |
83 | }; |
84 | |
85 | /** Initialize the context for ccp */ |
86 | void |
87 | ccp_init(ccp *_this, npppd_ppp *ppp) |
88 | { |
89 | struct tunnconf *conf; |
90 | |
91 | memset(_this, 0, sizeof(ccp)); |
92 | |
93 | _this->ppp = ppp; |
94 | _this->fsm.callbacks = &ccp_callbacks; |
95 | _this->fsm.protocol = PPP_PROTO_NCP0x8000 | NCP_CCP0xfd; |
96 | _this->fsm.ppp = ppp; |
97 | |
98 | fsm_init(&_this->fsm); |
99 | |
100 | conf = ppp_get_tunnconf(ppp); |
101 | PPP_FSM_CONFIG(&_this->fsm, timeouttime, conf->ccp_timeout)do { (&_this->fsm)->timeouttime = ((conf->ccp_timeout ) == 0) ? (&_this->fsm)->timeouttime : (conf->ccp_timeout ); } while (0 ); |
102 | PPP_FSM_CONFIG(&_this->fsm, maxconfreqtransmits,do { (&_this->fsm)->maxconfreqtransmits = ((conf-> ccp_max_configure) == 0) ? (&_this->fsm)->maxconfreqtransmits : (conf->ccp_max_configure); } while (0 ) |
103 | conf->ccp_max_configure)do { (&_this->fsm)->maxconfreqtransmits = ((conf-> ccp_max_configure) == 0) ? (&_this->fsm)->maxconfreqtransmits : (conf->ccp_max_configure); } while (0 ); |
104 | PPP_FSM_CONFIG(&_this->fsm, maxtermtransmits,do { (&_this->fsm)->maxtermtransmits = ((conf->ccp_max_terminate ) == 0) ? (&_this->fsm)->maxtermtransmits : (conf-> ccp_max_terminate); } while (0 ) |
105 | conf->ccp_max_terminate)do { (&_this->fsm)->maxtermtransmits = ((conf->ccp_max_terminate ) == 0) ? (&_this->fsm)->maxtermtransmits : (conf-> ccp_max_terminate); } while (0 ); |
106 | PPP_FSM_CONFIG(&_this->fsm, maxnakloops,do { (&_this->fsm)->maxnakloops = ((conf->ccp_max_nak_loop ) == 0) ? (&_this->fsm)->maxnakloops : (conf->ccp_max_nak_loop ); } while (0 ) |
107 | conf->ccp_max_nak_loop)do { (&_this->fsm)->maxnakloops = ((conf->ccp_max_nak_loop ) == 0) ? (&_this->fsm)->maxnakloops : (conf->ccp_max_nak_loop ); } while (0 ); |
108 | } |
109 | |
110 | /** Request Command Interpreter */ |
111 | static int |
112 | ccp_reqci(fsm *f, u_char *pktp, int *lpktp, int reject_if_disagree) |
113 | { |
114 | int type, len, rcode, lrej, lnak; |
115 | u_char *rejbuf, *nakbuf, *nakbuf0, *pktp0; |
116 | #ifdef USE_NPPPD_MPPE1 |
117 | uint32_t peer_bits, our_bits; |
118 | #endif |
119 | npppd_ppp *ppp; |
120 | |
121 | ppp = f->ppp; |
122 | |
123 | rejbuf = NULL((void *)0); |
124 | rcode = CONFACK2; |
125 | pktp0 = pktp; |
126 | lrej = 0; |
127 | lnak = 0; |
Value stored to 'lnak' is never read | |
128 | |
129 | if ((rejbuf = malloc(*lpktp)) == NULL((void *)0)) { |
130 | return rcode; |
131 | } |
132 | if ((nakbuf0 = malloc(*lpktp)) == NULL((void *)0)) { |
133 | free(rejbuf); |
134 | return rcode; |
135 | } |
136 | nakbuf = nakbuf0; |
137 | #define remlen()(lpkt - (pktp - pktp0)) (*lpktp - (pktp - pktp0)) |
138 | |
139 | while (remlen()(lpkt - (pktp - pktp0)) >= 2) { |
140 | GETCHAR(type, pktp){ (type) = *(pktp)++; }; |
141 | GETCHAR(len, pktp){ (len) = *(pktp)++; }; |
142 | if (len <= 0 || remlen()(lpkt - (pktp - pktp0)) + 2 < len) |
143 | goto fail; |
144 | |
145 | switch (type) { |
146 | #ifdef USE_NPPPD_MPPE1 |
147 | case CCP_MPPE0x12: |
148 | if (len < 6) |
149 | goto fail; |
150 | |
151 | if (ppp->mppe.enabled == 0) |
152 | goto reject; |
153 | GETLONG(peer_bits, pktp){ (peer_bits) = *(pktp)++ << 8; (peer_bits) |= *(pktp)++ ; (peer_bits) <<= 8; (peer_bits) |= *(pktp)++; (peer_bits ) <<= 8; (peer_bits) |= *(pktp)++; }; |
154 | our_bits = mppe_create_our_bits(&ppp->mppe, peer_bits); |
155 | if (our_bits != peer_bits) { |
156 | if (reject_if_disagree) { |
157 | pktp -= 4; |
158 | goto reject; |
159 | } |
160 | if (lrej > 0) { |
161 | /* don't nak because we are doing rej */ |
162 | } else { |
163 | PUTCHAR(type, nakbuf){ *(nakbuf)++ = (u_char) (type); }; |
164 | PUTCHAR(6, nakbuf){ *(nakbuf)++ = (u_char) (6); }; |
165 | PUTLONG(our_bits, nakbuf){ *(nakbuf)++ = (u_char) ((our_bits) >> 24); *(nakbuf)++ = (u_char) ((our_bits) >> 16); *(nakbuf)++ = (u_char) ( (our_bits) >> 8); *(nakbuf)++ = (u_char) (our_bits); }; |
166 | rcode = CONFNAK3; |
167 | } |
168 | } else |
169 | ppp->ccp.mppe_p_bits = our_bits; |
170 | break; |
171 | reject: |
172 | #endif |
173 | default: |
174 | pktp -= 2; |
175 | memcpy(rejbuf + lrej, pktp, len); |
176 | lrej += len; |
177 | pktp += len; |
178 | rcode = CONFREJ4; |
179 | } |
180 | continue; |
181 | } |
182 | fail: |
183 | switch (rcode) { |
184 | case CONFREJ4: |
185 | memcpy(pktp0, rejbuf, lrej); |
186 | *lpktp = lrej; |
187 | break; |
188 | case CONFNAK3: |
189 | len = nakbuf - nakbuf0; |
190 | memcpy(pktp0, nakbuf0, len); |
191 | *lpktp = len; |
192 | break; |
193 | } |
194 | free(rejbuf); |
195 | free(nakbuf0); |
196 | |
197 | return rcode; |
198 | #undef remlen |
199 | } |
200 | |
201 | static void |
202 | ccp_open(fsm *f) |
203 | { |
204 | ppp_ccp_opened(f->ppp); |
205 | } |
206 | |
207 | static void |
208 | ccp_close(fsm *f) |
209 | { |
210 | } |
211 | |
212 | static void |
213 | ccp_start(fsm *f) |
214 | { |
215 | } |
216 | |
217 | static void |
218 | ccp_stop(fsm *f) |
219 | { |
220 | #ifdef USE_NPPPD_MPPE1 |
221 | fsm_log(f, LOG_INFO6, "CCP is stopped"); |
222 | ppp_ccp_stopped(f->ppp); |
223 | #endif |
224 | } |
225 | |
226 | static void |
227 | ccp_resetci(fsm *f) |
228 | { |
229 | #ifdef USE_NPPPD_MPPE1 |
230 | if (f->ppp->mppe_started == 0) |
231 | f->ppp->ccp.mppe_o_bits = |
232 | mppe_create_our_bits(&f->ppp->mppe, 0); |
233 | /* don't reset if the ccp is started. */ |
234 | #endif |
235 | } |
236 | |
237 | static int |
238 | ccp_cilen(fsm *f) |
239 | { |
240 | return f->ppp->mru; |
241 | } |
242 | |
243 | /** Create a Confugre-Request */ |
244 | static void |
245 | ccp_addci(fsm *f, u_char *pktp, int *lpktp) |
246 | { |
247 | u_char *pktp0; |
248 | |
249 | pktp0 = pktp; |
250 | |
251 | if (f->ppp->ccp.mppe_rej == 0) { |
252 | PUTCHAR(CCP_MPPE, pktp){ *(pktp)++ = (u_char) (0x12); }; |
253 | PUTCHAR(6, pktp){ *(pktp)++ = (u_char) (6); }; |
254 | PUTLONG(f->ppp->ccp.mppe_o_bits, pktp){ *(pktp)++ = (u_char) ((f->ppp->ccp.mppe_o_bits) >> 24); *(pktp)++ = (u_char) ((f->ppp->ccp.mppe_o_bits) >> 16); *(pktp)++ = (u_char) ((f->ppp->ccp.mppe_o_bits) >> 8); *(pktp)++ = (u_char) (f->ppp->ccp.mppe_o_bits); }; |
255 | |
256 | *lpktp = pktp - pktp0; |
257 | } else |
258 | *lpktp = 0; |
259 | } |
260 | |
261 | static int |
262 | ccp_ackci(fsm *f, u_char *pktp, int lpkt) |
263 | { |
264 | return ccp_nackackci(f, pktp, lpkt, 0, 0); |
265 | } |
266 | |
267 | |
268 | static int |
269 | ccp_nakci(fsm *f, u_char *pktp, int lpkt) |
270 | { |
271 | return ccp_nackackci(f, pktp, lpkt, 1, 0); |
272 | } |
273 | |
274 | static int |
275 | ccp_rejci(fsm *f, u_char *pktp, int lpkt) |
276 | { |
277 | return ccp_nackackci(f, pktp, lpkt, 0, 1); |
278 | } |
279 | |
280 | static int |
281 | ccp_nackackci(fsm *f, u_char *pktp, int lpkt, int is_nak, int is_rej) |
282 | { |
283 | int type, len; |
284 | u_char *pktp0; |
285 | #ifdef USE_NPPPD_MPPE1 |
286 | uint32_t peer_bits, our_bits; |
287 | #endif |
288 | npppd_ppp *ppp; |
289 | |
290 | ppp = f->ppp; |
291 | |
292 | pktp0 = pktp; |
293 | |
294 | #define remlen()(lpkt - (pktp - pktp0)) (lpkt - (pktp - pktp0)) |
295 | while (remlen()(lpkt - (pktp - pktp0)) >= 2) { |
296 | GETCHAR(type, pktp){ (type) = *(pktp)++; }; |
297 | GETCHAR(len, pktp){ (len) = *(pktp)++; }; |
298 | if (len <= 0 || remlen()(lpkt - (pktp - pktp0)) + 2 < len) |
299 | goto fail; |
300 | |
301 | switch (type) { |
302 | #ifdef USE_NPPPD_MPPE1 |
303 | case CCP_MPPE0x12: |
304 | if (len < 6) |
305 | goto fail; |
306 | if (is_rej) { |
307 | f->ppp->ccp.mppe_rej = 1; |
308 | return 1; |
309 | } |
310 | if (ppp->mppe_started != 0) { |
311 | /* resend silently */ |
312 | return 1; |
313 | } |
314 | GETLONG(peer_bits, pktp){ (peer_bits) = *(pktp)++ << 8; (peer_bits) |= *(pktp)++ ; (peer_bits) <<= 8; (peer_bits) |= *(pktp)++; (peer_bits ) <<= 8; (peer_bits) |= *(pktp)++; }; |
315 | /* |
316 | * With Yamaha RTX-1000 that is configured as |
317 | * "ppp ccp mppe-any", |
318 | * |
319 | * npppd ConfReq (40,56,128) => RTX 1000 |
320 | * npppd <= (40,128) ConfNAK RTX 1000 |
321 | * npppd ConfReq (40,56,128) => RTX 1000 |
322 | * npppd <= (40,128) ConfNAK RTX 1000 |
323 | * |
324 | * both peers never decide the final bits. We insist |
325 | * the longest bit if our request is nacked. |
326 | */ |
327 | our_bits = mppe_create_our_bits(&ppp->mppe, peer_bits); |
328 | if (peer_bits == our_bits || is_nak) |
329 | ppp->ccp.mppe_o_bits = our_bits; |
330 | |
331 | break; |
332 | #endif |
333 | default: |
334 | goto fail; |
335 | } |
336 | } |
337 | return 1; |
338 | fail: |
339 | return 0; |
340 | } |
341 | |
342 | #define RESET_REQ0x0e 0x0e |
343 | #define RESET_ACK0x0f 0x0f |
344 | |
345 | static int |
346 | ccp_ext(fsm *f, int code, int id, u_char *pktp, int lpktp) |
347 | { |
348 | switch (code) { |
349 | case RESET_REQ0x0e: |
350 | fsm_log(f, LOG_DEBUG7, "Received ResetReq %d", id); |
351 | #ifdef USE_NPPPD_MPPE1 |
352 | mppe_recv_ccp_reset(&f->ppp->mppe); |
353 | #endif |
354 | /* |
355 | * RFC 3078 says MPPE can be synchronized without Reset-Ack, |
356 | * but it doesn't tell about necessity of Reset-Ack. But |
357 | * in fact, windows peer will complain Reset-Ack with |
358 | * Code-Reject. So we don't send Reset-Ack. |
359 | */ |
360 | return 1; |
361 | case RESET_ACK0x0f: |
362 | fsm_log(f, LOG_DEBUG7, "Received ResetAck %d", id); |
363 | return 1; |
364 | } |
365 | return 0; |
366 | } |