2 * Copyright (c) 1999, Boris Popov
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $FreeBSD: src/sys/netncp/ncp_ncp.c,v 1.3 1999/10/29 10:21:07 bp Exp $
33 * $DragonFly: src/sys/netproto/ncp/ncp_ncp.c,v 1.8 2005/06/10 22:43:59 dillon Exp $
35 * Core of NCP protocol
40 #include <sys/param.h>
41 #include <sys/errno.h>
42 #include <sys/systm.h>
45 #include <sys/signalvar.h>
47 #include <sys/thread2.h>
50 #include <netproto/ipx/ipx.h>
51 #include <netproto/ipx/ipx_var.h>
62 static int ncp_do_request(struct ncp_conn *,struct ncp_rq *rqp);
63 static int ncp_negotiate_buffersize(struct ncp_conn *conn, int size, int *target);
64 static int ncp_renegotiate_connparam(struct ncp_conn *conn, int buffsize, int in_options);
65 static void ncp_sign_packet(struct ncp_conn *conn, struct ncp_rq *rqp, int *size);
70 void m_dumpm(struct mbuf *m) {
79 printf("%02x ",((int)*(p++)) & 0xff);
85 #endif /* NCP_DATA_DEBUG */
88 ncp_chkintr(struct ncp_conn *conn, struct thread *td)
91 struct proc *p = td->td_proc;
95 tmpset = p->p_siglist;
96 SIGSETNAND(tmpset, p->p_sigmask);
97 SIGSETNAND(tmpset, p->p_sigignore);
98 if (SIGNOTEMPTY(p->p_siglist) && NCP_SIGMASK(tmpset))
104 * Process initial NCP handshake (attach)
105 * NOTE: Since all functions below may change conn attributes, they
106 * should be called with LOCKED connection, also they use td & ucred
109 ncp_ncp_connect(struct ncp_conn *conn) {
111 struct ncp_rphdr *rp;
114 conn->flags &= ~(NCPFL_INVALID | NCPFL_SIGNACTIVE | NCPFL_SIGNWANTED);
116 checkbad(ncp_rq_head(rqp,NCP_ALLOC_SLOT,0,conn->td,conn->ucred));
117 error=ncp_do_request(conn,rqp);
119 rp = mtod(rqp->rp, struct ncp_rphdr*);
120 conn->connid = rp->conn_low + (rp->conn_high << 8);
123 if (error) return error;
124 conn->flags |= NCPFL_ATTACHED;
126 error = ncp_renegotiate_connparam(conn, NCP_DEFAULT_BUFSIZE, 0);
127 if (error == NWE_SIGNATURE_LEVEL_CONFLICT) {
128 printf("Unable to negotiate requested security level\n");
132 ncp_ncp_disconnect(conn);
136 ncp_burst_connect(conn);
143 ncp_ncp_disconnect(struct ncp_conn *conn) {
145 struct ncp_rqhdr *ncprq;
148 NCPSDEBUG("for connid=%d\n",conn->nc_id);
150 ncp_burst_disconnect(conn);
152 error=ncp_rq_head(rqp,NCP_FREE_SLOT,0,conn->td,conn->ucred);
153 ncprq = mtod(rqp->rq,struct ncp_rqhdr*);
154 error=ncp_do_request(conn,rqp);
156 ncp_conn_invalidate(conn);
157 ncp_sock_disconnect(conn);
161 * Make a signature for the current packet and add it at the end of the
165 ncp_sign_packet(struct ncp_conn *conn, struct ncp_rq *rqp, int *size) {
168 bzero(data, sizeof(data));
169 bcopy(conn->sign_root, data, 8);
170 setdle(data, 8, *size);
171 m_copydata(rqp->rq, sizeof(struct ncp_rqhdr)-1,
172 min((*size) - sizeof(struct ncp_rqhdr)+1, 52),data+12);
173 ncp_sign(conn->sign_state, data, conn->sign_state);
174 ncp_rq_mem(rqp, (void*)conn->sign_state, 8);
179 * Low level send rpc, here we do not attempt to restore any connection,
180 * Connection expected to be locked
183 ncp_do_request(struct ncp_conn *conn, struct ncp_rq *rqp) {
184 int error=EIO,len, dosend, plen = 0, gotpacket;
186 struct thread *td = conn->td;
187 struct ncp_rqhdr *rq;
188 struct ncp_rphdr *rp=NULL;
190 struct mbuf *m, *mreply = NULL;
195 td = curthread; /* XXX maybe procpage ? */
196 if (!ncp_conn_valid(conn)) {
197 printf("%s: conn not valid\n",__func__);
202 printf("%s: ncp_so is NULL !\n",__func__);
203 ncp_conn_invalidate(conn); /* wow ! how we do that ? */
207 * Flush out replies on previous reqs
210 while (1/*so->so_rcv.sb_cc*/) {
211 if (ncp_poll(so,POLLIN) == 0) break;
212 if (ncp_sock_recv(so,&m,&len) != 0) break;
215 rq = mtod(rqp->rq,struct ncp_rqhdr *);
223 rqp->rq->m_pkthdr.len = len;
225 case 0x15: case 0x16: case 0x17: case 0x23:
227 *((u_int16_t*)(mtod(m,u_int8_t*)+sizeof(*rq))) = htons(len-2-sizeof(*rq));
230 if (conn->flags & NCPFL_SIGNACTIVE) {
231 ncp_sign_packet(conn, rqp, &len);
232 rqp->rq->m_pkthdr.len = len;
234 rq->conn_low = conn->connid & 0xff;
235 /* rq->task = p->p_pgrp->pg_id & 0xff; */ /*p->p_pid*/
236 /* XXX: this is temporary fix till I find a better solution */
237 rq->task = rq->conn_low;
238 rq->conn_high = conn->connid >> 8;
239 rqp->rexmit = conn->li.retry_count;
241 if (rqp->rexmit-- == 0) {
247 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,
248 rqp->rq->m_pkthdr.len, rq->seq, rq->task
250 error = ncp_sock_send(so, rqp->rq, rqp);
253 tv.tv_sec = conn->li.timeout;
255 error = ncp_sock_rselect(so, td, &tv, POLLIN);
256 if (error == EWOULDBLOCK ) /* timeout expired */
258 error = ncp_chkintr(conn, td);
259 if (error == EINTR) /* we dont restart */
263 * At this point it is possible to get more than one
264 * reply from server. In general, last reply should be for
265 * current request, but not always. So, we loop through
266 * all replies to find the right answer and flush others.
268 gotpacket = 0; /* nothing good found */
269 dosend = 1; /* resend rq if error */
272 if (ncp_poll(so,POLLIN) == 0) break;
273 /* if (so->so_rcv.sb_cc == 0) {
276 error = ncp_sock_recv(so,&m,&len);
277 if (error) break; /* must be more checks !!! */
278 if (m->m_len < sizeof(*rp)) {
279 m = m_pullup(m, sizeof(*rp));
281 printf("%s: reply too short\n",__func__);
285 rp = mtod(m, struct ncp_rphdr*);
286 if (len == sizeof(*rp) && rp->type == NCP_POSITIVE_ACK) {
287 NCPSDEBUG("got positive acknowledge\n");
289 rqp->rexmit = conn->li.retry_count;
290 dosend = 0; /* server just busy and will reply ASAP */
293 NCPSDEBUG("recv:%04x c=%d l=%d s=%d t=%d cc=%02x cs=%02x\n",rp->type,
294 (rp->conn_high << 8) + rp->conn_low, len, rp->seq, rp->task,
295 rp->completion_code, rp->connection_state);
297 if ( (rp->type == NCP_REPLY) &&
298 ((rq->type == NCP_ALLOC_SLOT) ||
299 ((rp->conn_low == rq->conn_low) &&
300 (rp->conn_high == rq->conn_high)
302 if (rq->seq > rp->seq || (rq->seq == 0 && rp->seq == 0xff)) {
305 if (rp->seq == rq->seq) {
313 continue; /* look up other for other packets */
317 NCPSDEBUG("reply mismatch\n");
320 if (gotpacket) break;
321 /* try to resend, or just wait */
326 NCPSDEBUG("error=%d\n",error);
327 if (error != EINTR) /* if not just interrupt */
328 ncp_conn_invalidate(conn); /* only reconnect to restore */
331 if (conn->flags & NCPFL_SIGNACTIVE) {
332 /* XXX: check reply signature */
338 rp = mtod(m, struct ncp_rphdr*);
341 rqp->cc = error = rp->completion_code;
342 if (error) error |= 0x8900; /* server error */
343 rqp->cs = rp->connection_state;
344 if (rqp->cs & (NCP_CS_BAD_CONN | NCP_CS_SERVER_DOWN)) {
345 NCPSDEBUG("server drop us\n");
346 ncp_conn_invalidate(conn);
351 rqp->bpos = mtod(m, caddr_t) + sizeof(*rp);
356 * Here we will try to restore any loggedin & dropped connection,
357 * connection should be locked on entry
359 int ncp_restore_login(struct ncp_conn *conn);
361 ncp_restore_login(struct ncp_conn *conn) {
364 if (conn->flags & NCPFL_RESTORING) {
365 printf("Hey, ncp_restore_login called twise !!!\n");
368 oldflags = conn->flags;
369 printf("Restoring connection, flags = %d\n",oldflags);
370 if ((oldflags & NCPFL_LOGGED) == 0) {
371 return ECONNRESET; /* no need to restore empty conn */
373 conn->flags &= ~(NCPFL_LOGGED | NCPFL_ATTACHED);
374 conn->flags |= NCPFL_RESTORING;
375 do { /* not a loop */
376 error = ncp_reconnect(conn);
379 error = ncp_login_object(conn, conn->li.user, conn->li.objtype, conn->li.password,conn->td,conn->ucred);
381 conn->flags |= NCPFL_LOGGED;
384 conn->flags = oldflags | NCPFL_INVALID;
386 conn->flags &= ~NCPFL_RESTORING;
391 ncp_request(struct ncp_conn *conn, struct ncp_rq *rqp) {
393 /* struct ncp_rqhdr *rq = mtod(rqp->rq,struct ncp_rqhdr*);*/
395 error = ncp_conn_lock(conn,rqp->td,rqp->cred,NCPM_EXECUTE);
396 if (error) return error;
397 rcnt = NCP_RESTORE_COUNT;
399 if (!ncp_conn_valid(conn)) {
405 error = ncp_restore_login(conn);
409 error=ncp_do_request(conn, rqp);
410 if (ncp_conn_valid(conn)) /* not just error ! */
413 ncp_conn_unlock(conn,rqp->td);
418 * All negotiation functions expect a locked connection
421 ncp_negotiate_buffersize(struct ncp_conn *conn, int size, int *target) {
425 NCP_RQ_HEAD(0x21,conn->td,conn->ucred);
426 ncp_rq_word_hl(rqp, size);
427 checkbad(ncp_request(conn,rqp));
428 *target = min(ncp_rp_word_hl(rqp), size);
434 ncp_negotiate_size_and_options(struct ncp_conn *conn, int size, int options,
435 int *ret_size, int *ret_options) {
440 NCP_RQ_HEAD(0x61,conn->td,conn->ucred);
441 ncp_rq_word_hl(rqp, size);
442 ncp_rq_byte(rqp, options);
443 checkbad(ncp_request(conn, rqp));
444 rs = ncp_rp_word_hl(rqp);
445 *ret_size = (rs == 0) ? size : min(rs, size);
446 ncp_rp_word_hl(rqp); /* skip echo socket */
447 *ret_options = ncp_rp_byte(rqp);
453 ncp_renegotiate_connparam(struct ncp_conn *conn, int buffsize, int in_options)
455 int neg_buffsize, error, options, sl;
457 sl = conn->li.sig_level;
459 in_options |= NCP_SECURITY_LEVEL_SIGN_HEADERS;
462 in_options |= NCP_IPX_CHECKSUM;
464 error = ncp_negotiate_size_and_options(conn, buffsize, in_options,
465 &neg_buffsize, &options);
468 if ((options ^ in_options) & NCP_IPX_CHECKSUM) {
470 printf("Server refuses to support IPX checksums\n");
471 return NWE_REQUESTER_FAILURE;
473 in_options |= NCP_IPX_CHECKSUM;
477 if ((options ^ in_options) & 2) {
478 if (sl == 0 || sl == 3)
479 return NWE_SIGNATURE_LEVEL_CONFLICT;
481 in_options |= NCP_SECURITY_LEVEL_SIGN_HEADERS;
486 error = ncp_negotiate_size_and_options(conn,
487 buffsize, in_options, &neg_buffsize, &options);
488 if ((options ^ in_options) & 3) {
489 return NWE_SIGNATURE_LEVEL_CONFLICT;
493 in_options &= ~NCP_SECURITY_LEVEL_SIGN_HEADERS;
494 error = ncp_negotiate_buffersize(conn, NCP_DEFAULT_BUFSIZE,
497 if (error) return error;
498 if ((neg_buffsize < 512) || (neg_buffsize > NCP_MAX_BUFSIZE))
500 conn->buffer_size = neg_buffsize;
501 if (in_options & NCP_SECURITY_LEVEL_SIGN_HEADERS)
502 conn->flags |= NCPFL_SIGNWANTED;
504 ncp_sock_checksum(conn, in_options & NCP_IPX_CHECKSUM);
510 ncp_reconnect(struct ncp_conn *conn) {
513 /* close any open sockets */
514 ncp_sock_disconnect(conn);
515 switch( conn->li.saddr.sa_family ) {
518 error = ncp_sock_connect_ipx(conn);
523 error = ncp_sock_connect_in(conn);
527 return EPROTONOSUPPORT;
530 error = ncp_ncp_connect(conn);
535 * Create conn structure and try to do low level connect
536 * Server addr should be filled in.
539 ncp_connect(struct ncp_conn_args *li, struct thread *td, struct ucred *cred,
540 struct ncp_conn **aconn)
542 struct ncp_conn *conn;
546 if (li->saddr.sa_family != AF_INET && li->saddr.sa_family != AF_IPX)
547 return EPROTONOSUPPORT;
548 isroot = ncp_suser(cred) == 0;
550 * Only root can change ownership
552 if (li->owner != NCP_DEFAULT_OWNER && !isroot)
554 if (li->group != NCP_DEFAULT_GROUP &&
555 !groupmember(li->group, cred) && !isroot)
557 if (li->owner != NCP_DEFAULT_OWNER) {
559 owner->cr_uid = li->owner;
561 owner = crhold(cred);
563 error = ncp_conn_alloc(td, owner, &conn);
571 conn->nc_group = (li->group != NCP_DEFAULT_GROUP) ?
572 li->group : cred->cr_groups[0];
574 if (li->retry_count == 0)
575 conn->li.retry_count = NCP_RETRY_COUNT;
576 if (li->timeout == 0)
577 conn->li.timeout = NCP_RETRY_TIMEOUT;
578 error = ncp_reconnect(conn);
580 ncp_disconnect(conn);
587 * Break connection and deallocate memory
590 ncp_disconnect(struct ncp_conn *conn) {
592 if (ncp_conn_access(conn,conn->ucred,NCPM_WRITE))
594 if (conn->ref_cnt != 0) return EBUSY;
595 if (conn->flags & NCPFL_PERMANENT) return EBUSY;
596 if (ncp_conn_valid(conn)) {
597 ncp_ncp_disconnect(conn);
599 ncp_sock_disconnect(conn);
605 ncp_check_rq(struct ncp_conn *conn){
607 if (conn->flags & NCPFL_INTR) return;
608 /* first, check for signals */
609 if (ncp_chkintr(conn,conn->td)) {
610 conn->flags |= NCPFL_INTR;