FreeBSD/Linux Kernel Cross Reference
sys/netncp/ncp_rq.c
1 /*-
2 * Copyright (c) 1999-2001 Boris Popov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * Routines to prepare request and fetch reply
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/9.2/sys/netncp/ncp_rq.c 206361 2010-04-07 16:50:38Z joel $");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/errno.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/mbuf.h>
38 #include <sys/poll.h>
39 #include <sys/proc.h>
40 #include <sys/socket.h>
41 #include <sys/socketvar.h>
42 #include <sys/uio.h>
43
44 #include <netncp/ncp.h>
45 #include <netncp/ncp_conn.h>
46 #include <netncp/ncp_rq.h>
47 #include <netncp/ncp_subr.h>
48 #include <netncp/ncp_ncp.h>
49 #include <netncp/ncp_sock.h>
50 #include <netncp/ncp_nls.h>
51
52 static MALLOC_DEFINE(M_NCPRQ, "NCPRQ", "NCP request");
53
54 static int ncp_sign_packet(struct ncp_conn *conn, struct ncp_rq *rqp, int *size);
55
56 int
57 ncp_rq_alloc_any(u_int32_t ptype, u_int8_t fn, struct ncp_conn *ncp,
58 struct thread *td, struct ucred *cred,
59 struct ncp_rq **rqpp)
60 {
61 struct ncp_rq *rqp;
62 int error;
63
64 rqp = malloc(sizeof(*rqp), M_NCPRQ, M_WAITOK);
65 error = ncp_rq_init_any(rqp, ptype, fn, ncp, td, cred);
66 rqp->nr_flags |= NCPR_ALLOCED;
67 if (error) {
68 ncp_rq_done(rqp);
69 return error;
70 }
71 *rqpp = rqp;
72 return 0;
73 }
74
75 int
76 ncp_rq_alloc(u_int8_t fn, struct ncp_conn *ncp,
77 struct thread *td, struct ucred *cred, struct ncp_rq **rqpp)
78 {
79 return ncp_rq_alloc_any(NCP_REQUEST, fn, ncp, td, cred, rqpp);
80 }
81
82 int
83 ncp_rq_alloc_subfn(u_int8_t fn, u_int8_t subfn, struct ncp_conn *ncp,
84 struct thread *td, struct ucred *cred, struct ncp_rq **rqpp)
85 {
86 struct ncp_rq *rqp;
87 int error;
88
89 error = ncp_rq_alloc_any(NCP_REQUEST, fn, ncp, td, cred, &rqp);
90 if (error)
91 return error;
92 mb_reserve(&rqp->rq, 2);
93 mb_put_uint8(&rqp->rq, subfn);
94 *rqpp = rqp;
95 return 0;
96 }
97
98 int
99 ncp_rq_init_any(struct ncp_rq *rqp, u_int32_t ptype, u_int8_t fn,
100 struct ncp_conn *ncp,
101 struct thread *td, struct ucred *cred)
102 {
103 struct ncp_rqhdr *rq;
104 struct ncp_bursthdr *brq;
105 struct mbchain *mbp;
106 int error;
107
108 bzero(rqp, sizeof(*rqp));
109 error = ncp_conn_access(ncp, cred, NCPM_EXECUTE);
110 if (error)
111 return error;
112 rqp->nr_td = td;
113 rqp->nr_cred = cred;
114 rqp->nr_conn = ncp;
115 mbp = &rqp->rq;
116 if (mb_init(mbp) != 0)
117 return ENOBUFS;
118 switch(ptype) {
119 case NCP_PACKET_BURST:
120 brq = (struct ncp_bursthdr*)mb_reserve(mbp, sizeof(*brq));
121 brq->bh_type = ptype;
122 brq->bh_streamtype = 0x2;
123 break;
124 default:
125 rq = (struct ncp_rqhdr*)mb_reserve(mbp, sizeof(*rq));
126 rq->type = ptype;
127 rq->seq = 0; /* filled later */
128 rq->fn = fn;
129 break;
130 }
131 rqp->nr_minrplen = -1;
132 return 0;
133 }
134
135 void
136 ncp_rq_done(struct ncp_rq *rqp)
137 {
138 mb_done(&rqp->rq);
139 md_done(&rqp->rp);
140 if (rqp->nr_flags & NCPR_ALLOCED)
141 free(rqp, M_NCPRQ);
142 return;
143 }
144
145 /*
146 * Routines to fill the request
147 */
148
149 static int
150 ncp_rq_pathstrhelp(struct mbchain *mbp, c_caddr_t src, caddr_t dst,
151 size_t *srclen, size_t *dstlen)
152 {
153 int len;
154
155 if (*srclen < *dstlen) {
156 *dstlen = *srclen;
157 len = (int)*srclen;
158 } else {
159 *srclen = *dstlen;
160 len = (int)*dstlen;
161 }
162 ncp_pathcopy(src, dst, len, mbp->mb_udata);
163 return 0;
164 }
165
166 int
167 ncp_rq_pathstring(struct ncp_rq *rqp, int size, const char *name,
168 struct ncp_nlstables *nt)
169 {
170 struct mbchain *mbp = &rqp->rq;
171
172 mb_put_uint8(mbp, size);
173 mbp->mb_copy = ncp_rq_pathstrhelp;
174 mbp->mb_udata = nt;
175 return mb_put_mem(mbp, (c_caddr_t)name, size, MB_MCUSTOM);
176 }
177
178 int
179 ncp_rq_pstring(struct ncp_rq *rqp, const char *s)
180 {
181 u_int len = strlen(s);
182 int error;
183
184 if (len > 255)
185 return EINVAL;
186 error = mb_put_uint8(&rqp->rq, len);
187 if (error)
188 return error;
189 return mb_put_mem(&rqp->rq, s, len, MB_MSYSTEM);
190 }
191
192 int
193 ncp_rq_dbase_path(struct ncp_rq *rqp, u_int8_t vol_num, u_int32_t dir_base,
194 int namelen, u_char *path, struct ncp_nlstables *nt)
195 {
196 struct mbchain *mbp = &rqp->rq;
197 int complen;
198
199 mb_put_uint8(mbp, vol_num);
200 mb_put_mem(mbp, (c_caddr_t)&dir_base, sizeof(dir_base), MB_MSYSTEM);
201 mb_put_uint8(mbp, 1); /* with dirbase */
202 if (path != NULL && path[0]) {
203 if (namelen < 0) {
204 namelen = *path++;
205 mb_put_uint8(mbp, namelen);
206 for(; namelen; namelen--) {
207 complen = *path++;
208 mb_put_uint8(mbp, complen);
209 mb_put_mem(mbp, path, complen, MB_MSYSTEM);
210 path += complen;
211 }
212 } else {
213 mb_put_uint8(mbp, 1); /* 1 component */
214 ncp_rq_pathstring(rqp, namelen, path, nt);
215 }
216 } else {
217 mb_put_uint8(mbp, 0);
218 mb_put_uint8(mbp, 0);
219 }
220 return 0;
221 }
222
223 /*
224 * Make a signature for the current packet and add it at the end of the
225 * packet.
226 */
227 static int
228 ncp_sign_packet(struct ncp_conn *conn, struct ncp_rq *rqp, int *size)
229 {
230 u_char data[64];
231 int error;
232
233 bzero(data, sizeof(data));
234 bcopy(conn->sign_root, data, 8);
235 setdle(data, 8, *size);
236 m_copydata(rqp->rq.mb_top, sizeof(struct ncp_rqhdr) - 1,
237 min((*size) - sizeof(struct ncp_rqhdr)+1, 52), data + 12);
238 ncp_sign(conn->sign_state, data, conn->sign_state);
239 error = mb_put_mem(&rqp->rq, (caddr_t)conn->sign_state, 8, MB_MSYSTEM);
240 if (error)
241 return error;
242 (*size) += 8;
243 return 0;
244 }
245
246 /*
247 * Low level send rpc, here we do not attempt to restore any connection,
248 * Connection expected to be locked
249 */
250 int
251 ncp_request_int(struct ncp_rq *rqp)
252 {
253 struct ncp_conn *conn = rqp->nr_conn;
254 struct thread *td = conn->td;
255 struct socket *so = conn->ncp_so;
256 struct ncp_rqhdr *rq;
257 struct ncp_rphdr *rp=NULL;
258 struct timeval tv;
259 struct mbuf *m, *mreply = NULL;
260 struct mbchain *mbp;
261 int error, len, dosend, plen = 0, gotpacket;
262
263 if (so == NULL) {
264 printf("%s: ncp_so is NULL !\n",__func__);
265 ncp_conn_invalidate(conn);
266 return ENOTCONN;
267 }
268 if (td == NULL)
269 td = curthread; /* XXX maybe procpage ? */
270 /*
271 * Flush out replies on previous reqs
272 */
273 tv.tv_sec = 0;
274 tv.tv_usec = 0;
275 while (selsocket(so, POLLIN, &tv, td) == 0) {
276 if (ncp_sock_recv(so, &m, &len) != 0)
277 break;
278 m_freem(m);
279 }
280 mbp = &rqp->rq;
281 len = mb_fixhdr(mbp);
282 rq = mtod(mbp->mb_top, struct ncp_rqhdr *);
283 rq->seq = conn->seq;
284 m = rqp->rq.mb_top;
285
286 switch (rq->fn) {
287 case 0x15: case 0x16: case 0x17: case 0x23:
288 *(u_int16_t*)(rq + 1) = htons(len - 2 - sizeof(*rq));
289 break;
290 }
291 if (conn->flags & NCPFL_SIGNACTIVE) {
292 error = ncp_sign_packet(conn, rqp, &len);
293 if (error)
294 return error;
295 mbp->mb_top->m_pkthdr.len = len;
296 }
297 rq->conn_low = conn->connid & 0xff;
298 /* rq->task = p->p_pgrp->pg_id & 0xff; */ /*p->p_pid*/
299 /* XXX: this is temporary fix till I find a better solution */
300 rq->task = rq->conn_low;
301 rq->conn_high = conn->connid >> 8;
302 rqp->rexmit = conn->li.retry_count;
303 error = 0;
304 for(dosend = 1;;) {
305 if (rqp->rexmit-- == 0) {
306 error = ETIMEDOUT;
307 break;
308 }
309 error = 0;
310 if (dosend) {
311 NCPSDEBUG("send:%04x f=%02x c=%d l=%d s=%d t=%d\n",rq->type, rq->fn, (rq->conn_high << 8) + rq->conn_low,
312 mbp->mb_top->m_pkthdr.len, rq->seq, rq->task
313 );
314 error = ncp_sock_send(so, mbp->mb_top, rqp);
315 if (error)
316 break;
317 }
318 tv.tv_sec = conn->li.timeout;
319 tv.tv_usec = 0;
320 error = selsocket(so, POLLIN, &tv, td);
321 if (error == EWOULDBLOCK ) /* timeout expired */
322 continue;
323 error = ncp_chkintr(conn, td);
324 if (error)
325 break;
326 /*
327 * At this point it is possible to get more than one
328 * reply from server. In general, last reply should be for
329 * current request, but not always. So, we loop through
330 * all replies to find the right answer and flush others.
331 */
332 gotpacket = 0; /* nothing good found */
333 dosend = 1; /* resend rq if error */
334 for (;;) {
335 error = 0;
336 tv.tv_sec = 0;
337 tv.tv_usec = 0;
338 if (selsocket(so, POLLIN, &tv, td) != 0)
339 break;
340 /* if (so->so_rcv.sb_cc == 0) {
341 break;
342 }*/
343 error = ncp_sock_recv(so, &m, &len);
344 if (error)
345 break; /* must be more checks !!! */
346 if (m->m_len < sizeof(*rp)) {
347 m = m_pullup(m, sizeof(*rp));
348 if (m == NULL) {
349 printf("%s: reply too short\n",__func__);
350 continue;
351 }
352 }
353 rp = mtod(m, struct ncp_rphdr*);
354 if (len == sizeof(*rp) && rp->type == NCP_POSITIVE_ACK) {
355 NCPSDEBUG("got positive acknowledge\n");
356 m_freem(m);
357 rqp->rexmit = conn->li.retry_count;
358 dosend = 0; /* server just busy and will reply ASAP */
359 continue;
360 }
361 NCPSDEBUG("recv:%04x c=%d l=%d s=%d t=%d cc=%02x cs=%02x\n",rp->type,
362 (rp->conn_high << 8) + rp->conn_low, len, rp->seq, rp->task,
363 rp->completion_code, rp->connection_state);
364 NCPDDEBUG(m);
365 if ( (rp->type == NCP_REPLY) &&
366 ((rq->type == NCP_ALLOC_SLOT) ||
367 ((rp->conn_low == rq->conn_low) &&
368 (rp->conn_high == rq->conn_high)
369 ))) {
370 if (rq->seq > rp->seq || (rq->seq == 0 && rp->seq == 0xff)) {
371 dosend = 1;
372 }
373 if (rp->seq == rq->seq) {
374 if (gotpacket) {
375 m_freem(m);
376 } else {
377 gotpacket = 1;
378 mreply = m;
379 plen = len;
380 }
381 continue; /* look up other for other packets */
382 }
383 }
384 m_freem(m);
385 NCPSDEBUG("reply mismatch\n");
386 } /* for receive */
387 if (error || gotpacket)
388 break;
389 /* try to resend, or just wait */
390 }
391 conn->seq++;
392 if (error) {
393 NCPSDEBUG("error=%d\n", error);
394 /*
395 * Any error except interruped call means that we have
396 * to reconnect. So, eliminate future timeouts by invalidating
397 * connection now.
398 */
399 if (error != EINTR)
400 ncp_conn_invalidate(conn);
401 return (error);
402 }
403 if (conn->flags & NCPFL_SIGNACTIVE) {
404 /* XXX: check reply signature */
405 m_adj(mreply, -8);
406 plen -= 8;
407 }
408 rp = mtod(mreply, struct ncp_rphdr*);
409 md_initm(&rqp->rp, mreply);
410 rqp->nr_rpsize = plen - sizeof(*rp);
411 rqp->nr_cc = error = rp->completion_code;
412 if (error)
413 error |= 0x8900; /* server error */
414 rqp->nr_cs = rp->connection_state;
415 if (rqp->nr_cs & (NCP_CS_BAD_CONN | NCP_CS_SERVER_DOWN)) {
416 NCPSDEBUG("server drop us\n");
417 ncp_conn_invalidate(conn);
418 error = ECONNRESET;
419 }
420 md_get_mem(&rqp->rp, NULL, sizeof(*rp), MB_MSYSTEM);
421 return error;
422 }
423
424 /*
425 * Here we will try to restore any loggedin & dropped connection,
426 * connection should be locked on entry
427 */
428 static __inline int
429 ncp_restore_login(struct ncp_conn *conn)
430 {
431 int error;
432
433 printf("ncprq: Restoring connection, flags = %x\n", conn->flags);
434 conn->flags |= NCPFL_RESTORING;
435 error = ncp_conn_reconnect(conn);
436 if (!error && (conn->flags & NCPFL_WASLOGGED))
437 error = ncp_conn_login(conn, conn->td, conn->ucred);
438 if (error)
439 ncp_ncp_disconnect(conn);
440 conn->flags &= ~NCPFL_RESTORING;
441 return error;
442 }
443
444 int
445 ncp_request(struct ncp_rq *rqp)
446 {
447 struct ncp_conn *ncp = rqp->nr_conn;
448 int error, rcnt;
449
450 error = ncp_conn_lock(ncp, rqp->nr_td, rqp->nr_cred, NCPM_EXECUTE);
451 if (error)
452 goto out;
453 rcnt = NCP_RESTORE_COUNT;
454 for(;;) {
455 if (ncp->flags & NCPFL_ATTACHED) {
456 error = ncp_request_int(rqp);
457 if (ncp->flags & NCPFL_ATTACHED)
458 break;
459 }
460 if (rcnt-- == 0) {
461 error = ECONNRESET;
462 break;
463 }
464 /*
465 * Do not attempt to restore connection recursively
466 */
467 if (ncp->flags & NCPFL_RESTORING) {
468 error = ENOTCONN;
469 break;
470 }
471 error = ncp_restore_login(ncp);
472 if (error)
473 continue;
474 }
475 ncp_conn_unlock(ncp, rqp->nr_td);
476 out:
477 if (error && (rqp->nr_flags & NCPR_DONTFREEONERR) == 0)
478 ncp_rq_done(rqp);
479 return error;
480 }
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