sys/netproto/ncp/ncp_ncp.c

   1 /*
   2  * Copyright (c) 1999, 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  * 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.
  19  *
  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
  30  * SUCH DAMAGE.
  31  *
  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 1.15 2007/04/22 01:13:16 dillon Exp $
  34  *
  35  * Core of NCP protocol
  36  */
  37 #include "opt_inet.h"
  38 #include "opt_ipx.h"
  39
  40 #include <sys/param.h>
  41 #include <sys/errno.h>
  42 #include <sys/systm.h>
  43 #include <sys/proc.h>
  44 #include <sys/priv.h>
  45 #include <sys/poll.h>
  46 #include <sys/signalvar.h>
  47 #include <sys/signal2.h>
  48 #include <sys/mbuf.h>
  49 #include <sys/thread2.h>
  50 #include <sys/socketvar.h>
  51
  52 #ifdef IPX
  53 #include <netproto/ipx/ipx.h>
  54 #include <netproto/ipx/ipx_var.h>
  55 #endif
  56
  57 #include "ncp.h"
  58 #include "ncp_conn.h"
  59 #include "ncp_sock.h"
  60 #include "ncp_subr.h"
  61 #include "ncp_ncp.h"
  62 #include "ncp_rq.h"
  63 #include "nwerror.h"
  64
  65 static int ncp_do_request(struct ncp_conn *,struct ncp_rq *rqp);
  66 static int ncp_negotiate_buffersize(struct ncp_conn *conn, int size, int *target);
  67 static int ncp_renegotiate_connparam(struct ncp_conn *conn, int buffsize, int in_options);
  68 static void ncp_sign_packet(struct ncp_conn *conn, struct ncp_rq *rqp, int *size);
  69
  70
  71 #ifdef NCP_DATA_DEBUG
  72 static void
  73 m_dumpm(struct mbuf *m)
  74 {
  75         char *p;
  76         int len;
  77         kprintf("d=");
  78         while(m) {
  79                 p=mtod(m,char *);
  80                 len=m->m_len;
  81                 kprintf("(%d)",len);
  82                 while(len--){
  83                         kprintf("%02x ",((int)*(p++)) & 0xff);
  84                 }
  85                 m=m->m_next;
  86         };
  87         kprintf("\n");
  88 }
  89 #endif /* NCP_DATA_DEBUG */
  90
  91 int
  92 ncp_chkintr(struct ncp_conn *conn, struct thread *td)
  93 {
  94         sigset_t tmpset;
  95         struct lwp *lp = td->td_lwp;
  96         struct proc *p = td->td_proc;
  97
  98         if (p == NULL)
  99                 return 0;
 100         tmpset = lwp_sigpend(lp);
 101         SIGSETNAND(tmpset, lp->lwp_sigmask);
 102         SIGSETNAND(tmpset, p->p_sigignore);
 103         if (SIGNOTEMPTY(tmpset) && NCP_SIGMASK(tmpset))
 104                 return EINTR;
 105         return 0;
 106 }
 107
 108 /*
 109  * Process initial NCP handshake (attach)
 110  * NOTE: Since all functions below may change conn attributes, they
 111  * should be called with LOCKED connection, also they use td & ucred
 112  */
 113 int
 114 ncp_ncp_connect(struct ncp_conn *conn) {
 115         int error;
 116         struct ncp_rphdr *rp;
 117         DECLARE_RQ;
 118
 119         conn->flags &= ~(NCPFL_INVALID | NCPFL_SIGNACTIVE | NCPFL_SIGNWANTED);
 120         conn->seq = 0;
 121         checkbad(ncp_rq_head(rqp,NCP_ALLOC_SLOT,0,conn->td,conn->ucred));
 122         error=ncp_do_request(conn,rqp);
 123         if (!error) {
 124                 rp = mtod(rqp->rp, struct ncp_rphdr*);
 125                 conn->connid = rp->conn_low + (rp->conn_high << 8);
 126         }
 127         ncp_rq_done(rqp);
 128         if (error) return error;
 129         conn->flags |= NCPFL_ATTACHED;
 130
 131         error = ncp_renegotiate_connparam(conn, NCP_DEFAULT_BUFSIZE, 0);
 132         if (error == NWE_SIGNATURE_LEVEL_CONFLICT) {
 133                 kprintf("Unable to negotiate requested security level\n");
 134                 error = EOPNOTSUPP;
 135         }
 136         if (error) {
 137                 ncp_ncp_disconnect(conn);
 138                 return error;
 139         }
 140 #ifdef NCPBURST
 141         ncp_burst_connect(conn);
 142 #endif
 143 bad:
 144         return error;
 145 }
 146
 147 int
 148 ncp_ncp_disconnect(struct ncp_conn *conn) {
 149         int error;
 150         struct ncp_rqhdr *ncprq;
 151         DECLARE_RQ;
 152
 153         NCPSDEBUG("for connid=%d\n",conn->nc_id);
 154 #ifdef NCPBURST
 155         ncp_burst_disconnect(conn);
 156 #endif
 157         error=ncp_rq_head(rqp,NCP_FREE_SLOT,0,conn->td,conn->ucred);
 158         ncprq = mtod(rqp->rq,struct ncp_rqhdr*);
 159         error=ncp_do_request(conn,rqp);
 160         ncp_rq_done(rqp);
 161         ncp_conn_invalidate(conn);
 162         ncp_sock_disconnect(conn);
 163         return 0;
 164 }
 165 /*
 166  * Make a signature for the current packet and add it at the end of the
 167  * packet.
 168  */
 169 static void
 170 ncp_sign_packet(struct ncp_conn *conn, struct ncp_rq *rqp, int *size) {
 171         u_char data[64];
 172
 173         bzero(data, sizeof(data));
 174         bcopy(conn->sign_root, data, 8);
 175         setdle(data, 8, *size);
 176         m_copydata(rqp->rq, sizeof(struct ncp_rqhdr)-1,
 177                 min((*size) - sizeof(struct ncp_rqhdr)+1, 52),data+12);
 178         ncp_sign(conn->sign_state, data, conn->sign_state);
 179         ncp_rq_mem(rqp, (void*)conn->sign_state, 8);
 180         (*size) += 8;
 181 }
 182
 183 /*
 184  * Low level send rpc, here we do not attempt to restore any connection,
 185  * Connection expected to be locked
 186  */
 187 static int
 188 ncp_do_request(struct ncp_conn *conn, struct ncp_rq *rqp) {
 189         int error=EIO,len, dosend, plen = 0, gotpacket;
 190         struct socket *so;
 191         struct thread *td = conn->td;
 192         struct ncp_rqhdr *rq;
 193         struct ncp_rphdr *rp=NULL;
 194         struct timeval tv;
 195         struct mbuf *m, *mreply = NULL;
 196
 197         conn->nc_rq = rqp;
 198         rqp->conn = conn;
 199         if (td == NULL)
 200                 td = curthread; /* XXX maybe procpage ? */
 201         if (!ncp_conn_valid(conn)) {
 202                 kprintf("%s: conn not valid\n",__func__);
 203                 return (error);
 204         }
 205         so = conn->ncp_so;
 206         if (!so) {
 207                 kprintf("%s: ncp_so is NULL !\n",__func__);
 208                 ncp_conn_invalidate(conn);      /* wow ! how we do that ? */
 209                 return EBADF;
 210         }
 211         /*
 212          * Flush out replies on previous reqs
 213          */
 214         crit_enter();
 215         while (1/*so->so_rcv.sb_cc*/) {
 216                 struct sockbuf sio;
 217
 218                 if (ncp_poll(so, POLLIN) == 0)
 219                         break;
 220                 if (ncp_sock_recv(so, &sio) != 0)
 221                         break;
 222                 sbflush(&sio);
 223         }
 224         rq = mtod(rqp->rq,struct ncp_rqhdr *);
 225         rq->seq = conn->seq;
 226         m = rqp->rq;
 227         len = 0;
 228         while (m) {
 229                 len += m->m_len;
 230                 m = m->m_next;
 231         }
 232         rqp->rq->m_pkthdr.len = len;
 233         switch(rq->fn) {
 234             case 0x15: case 0x16: case 0x17: case 0x23:
 235                 m = rqp->rq;
 236                 *((u_int16_t*)(mtod(m,u_int8_t*)+sizeof(*rq))) = htons(len-2-sizeof(*rq));
 237                 break;
 238         }
 239         if (conn->flags & NCPFL_SIGNACTIVE) {
 240                 ncp_sign_packet(conn, rqp, &len);
 241                 rqp->rq->m_pkthdr.len = len;
 242         }
 243         rq->conn_low = conn->connid & 0xff;
 244         /* rq->task = p->p_pgrp->pg_id & 0xff; */ /*p->p_pid*/
 245         /* XXX: this is temporary fix till I find a better solution */
 246         rq->task = rq->conn_low;
 247         rq->conn_high = conn->connid >> 8;
 248         rqp->rexmit = conn->li.retry_count;
 249         for(dosend = 1;;) {
 250                 if (rqp->rexmit-- == 0) {
 251                         error = ETIMEDOUT;
 252                         break;
 253                 }
 254                 error = 0;
 255                 if (dosend) {
 256                         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,
 257                                 rqp->rq->m_pkthdr.len, rq->seq, rq->task
 258                         );
 259                         error = ncp_sock_send(so, rqp->rq, rqp);
 260                         if (error) break;
 261                 }
 262                 tv.tv_sec = conn->li.timeout;
 263                 tv.tv_usec = 0;
 264                 error = ncp_sock_rselect(so, td, &tv, POLLIN);
 265                 if (error == EWOULDBLOCK )      /* timeout expired */
 266                         continue;
 267                 error = ncp_chkintr(conn, td);
 268                 if (error == EINTR)             /* we dont restart */
 269                         break;
 270                 if (error) break;
 271                 /*
 272                  * At this point it is possible to get more than one
 273                  * reply from server. In general, last reply should be for
 274                  * current request, but not always. So, we loop through
 275                  * all replies to find the right answer and flush others.
 276                  */
 277                 gotpacket = 0;  /* nothing good found */
 278                 dosend = 1;     /* resend rq if error */
 279                 for (;;) {
 280                         struct sockbuf sio;
 281
 282                         error = 0;
 283                         if (ncp_poll(so,POLLIN) == 0) break;
 284                         error = ncp_sock_recv(so, &sio);
 285                         if (error) break;               /* must be more checks !!! */
 286
 287                         m = sio.sb_mb;
 288                         if (m->m_len < sizeof(*rp)) {
 289                                 m = m_pullup(m, sizeof(*rp));
 290                                 if (m == NULL) {
 291                                         kprintf("%s: reply too short\n",__func__);
 292                                         continue;
 293                                 }
 294                         }
 295                         rp = mtod(m, struct ncp_rphdr*);
 296                         if (sio.sb_cc == sizeof(*rp) && rp->type == NCP_POSITIVE_ACK) {
 297                                 NCPSDEBUG("got positive acknowledge\n");
 298                                 m_freem(m);
 299                                 rqp->rexmit = conn->li.retry_count;
 300                                 dosend = 0;     /* server just busy and will reply ASAP */
 301                                 continue;
 302                         }
 303                         NCPSDEBUG("recv:%04x c=%d l=%d s=%d t=%d cc=%02x cs=%02x\n",rp->type,
 304                             (rp->conn_high << 8) + rp->conn_low, sio.len, rp->seq, rp->task,
 305                              rp->completion_code, rp->connection_state);
 306                         NCPDDEBUG(m);
 307                         if ( (rp->type == NCP_REPLY) &&
 308                             ((rq->type == NCP_ALLOC_SLOT) ||
 309                             ((rp->conn_low == rq->conn_low) &&
 310                              (rp->conn_high == rq->conn_high)
 311                             ))) {
 312                                 if (rq->seq > rp->seq || (rq->seq == 0 && rp->seq == 0xff)) {
 313                                         dosend = 1;
 314                                 }
 315                                 if (rp->seq == rq->seq) {
 316                                         if (gotpacket) {
 317                                                 m_freem(m);
 318                                         } else {
 319                                                 gotpacket = 1;
 320                                                 mreply = m;
 321                                                 plen = sio.sb_cc;
 322                                         }
 323                                         continue;       /* look up other for other packets */
 324                                 }
 325                         }
 326                         m_freem(m);
 327                         NCPSDEBUG("reply mismatch\n");
 328                 } /* for receive */
 329                 if (error) break;
 330                 if (gotpacket) break;
 331                 /* try to resend, or just wait */
 332         }
 333         crit_exit();
 334         conn->seq++;
 335         if (error) {
 336                 NCPSDEBUG("error=%d\n",error);
 337                 if (error != EINTR)                     /* if not just interrupt */
 338                         ncp_conn_invalidate(conn);      /* only reconnect to restore */
 339                 return(error);
 340         }
 341         if (conn->flags & NCPFL_SIGNACTIVE) {
 342                 /* XXX: check reply signature */
 343                 m_adj(mreply, -8);
 344                 plen -= 8;
 345         }
 346         len = plen;
 347         m = mreply;
 348         rp = mtod(m, struct ncp_rphdr*);
 349         len -= sizeof(*rp);
 350         rqp->rpsize = len;
 351         rqp->cc = error = rp->completion_code;
 352         if (error) error |= 0x8900;     /* server error */
 353         rqp->cs = rp->connection_state;
 354         if (rqp->cs & (NCP_CS_BAD_CONN | NCP_CS_SERVER_DOWN)) {
 355                 NCPSDEBUG("server drop us\n");
 356                 ncp_conn_invalidate(conn);
 357                 error = ECONNRESET;
 358         }
 359         rqp->rp = m;
 360         rqp->mrp = m;
 361         rqp->bpos = mtod(m, caddr_t) + sizeof(*rp);
 362         return error;
 363 }
 364
 365 /*
 366  * Here we will try to restore any loggedin & dropped connection,
 367  * connection should be locked on entry
 368  */
 369 int ncp_restore_login(struct ncp_conn *conn);
 370 int
 371 ncp_restore_login(struct ncp_conn *conn) {
 372         int error, oldflags;
 373
 374         if (conn->flags & NCPFL_RESTORING) {
 375                 kprintf("Hey, ncp_restore_login called twise !!!\n");
 376                 return 0;
 377         }
 378         oldflags = conn->flags;
 379         kprintf("Restoring connection, flags = %d\n",oldflags);
 380         if ((oldflags & NCPFL_LOGGED) == 0) {
 381                 return ECONNRESET;      /* no need to restore empty conn */
 382         }
 383         conn->flags &= ~(NCPFL_LOGGED | NCPFL_ATTACHED);
 384         conn->flags |= NCPFL_RESTORING;
 385         do {    /* not a loop */
 386                 error = ncp_reconnect(conn);
 387                 if (error) break;
 388                 if (conn->li.user)
 389                         error = ncp_login_object(conn, conn->li.user, conn->li.objtype, conn->li.password,conn->td,conn->ucred);
 390                 if (error) break;
 391                 conn->flags |= NCPFL_LOGGED;
 392         } while(0);
 393         if (error) {
 394                 conn->flags = oldflags | NCPFL_INVALID;
 395         }
 396         conn->flags &= ~NCPFL_RESTORING;
 397         return error;
 398 }
 399
 400 int
 401 ncp_request(struct ncp_conn *conn, struct ncp_rq *rqp) {
 402         int error, rcnt;
 403 /*      struct ncp_rqhdr *rq = mtod(rqp->rq,struct ncp_rqhdr*);*/
 404
 405         error = ncp_conn_lock(conn,rqp->td,rqp->cred,NCPM_EXECUTE);
 406         if  (error) return error;
 407         rcnt = NCP_RESTORE_COUNT;
 408         for(;;) {
 409                 if (!ncp_conn_valid(conn)) {
 410                         if (rcnt==0) {
 411                                 error = ECONNRESET;
 412                                 break;
 413                         }
 414                         rcnt--;
 415                         error = ncp_restore_login(conn);
 416                         if (error)
 417                                 continue;
 418                 }
 419                 error=ncp_do_request(conn, rqp);
 420                 if (ncp_conn_valid(conn))       /* not just error ! */
 421                         break;
 422         }
 423         ncp_conn_unlock(conn,rqp->td);
 424         return error;
 425 }
 426
 427 /*
 428  * All negotiation functions expect a locked connection
 429  */
 430 static int
 431 ncp_negotiate_buffersize(struct ncp_conn *conn, int size, int *target) {
 432         int error;
 433         DECLARE_RQ;
 434
 435         NCP_RQ_HEAD(0x21,conn->td,conn->ucred);
 436         ncp_rq_word_hl(rqp, size);
 437         checkbad(ncp_request(conn,rqp));
 438         *target = min(ncp_rp_word_hl(rqp), size);
 439         NCP_RQ_EXIT;
 440         return error;
 441 }
 442
 443 static int
 444 ncp_negotiate_size_and_options(struct ncp_conn *conn, int size, int options,
 445             int *ret_size, int *ret_options) {
 446         int error;
 447         int rs;
 448         DECLARE_RQ;
 449
 450         NCP_RQ_HEAD(0x61,conn->td,conn->ucred);
 451         ncp_rq_word_hl(rqp, size);
 452         ncp_rq_byte(rqp, options);
 453         checkbad(ncp_request(conn, rqp));
 454         rs = ncp_rp_word_hl(rqp);
 455         *ret_size = (rs == 0) ? size : min(rs, size);
 456         ncp_rp_word_hl(rqp);    /* skip echo socket */
 457         *ret_options = ncp_rp_byte(rqp);
 458         NCP_RQ_EXIT;
 459         return error;
 460 }
 461
 462 static int
 463 ncp_renegotiate_connparam(struct ncp_conn *conn, int buffsize, int in_options)
 464 {
 465         int neg_buffsize, error, options, sl;
 466
 467         sl = conn->li.sig_level;
 468         if (sl >= 2)
 469                 in_options |= NCP_SECURITY_LEVEL_SIGN_HEADERS;
 470 #ifdef IPX
 471         if (ipxcksum == 2)
 472                 in_options |= NCP_IPX_CHECKSUM;
 473 #endif
 474         error = ncp_negotiate_size_and_options(conn, buffsize, in_options,
 475             &neg_buffsize, &options);
 476         if (!error) {
 477 #ifdef IPX
 478                 if ((options ^ in_options) & NCP_IPX_CHECKSUM) {
 479                         if (ipxcksum == 2) {
 480                                 kprintf("Server refuses to support IPX checksums\n");
 481                                 return NWE_REQUESTER_FAILURE;
 482                         }
 483                         in_options |= NCP_IPX_CHECKSUM;
 484                         error = 1;
 485                 }
 486 #endif /* IPX */
 487                 if ((options ^ in_options) & 2) {
 488                         if (sl == 0 || sl == 3)
 489                                 return NWE_SIGNATURE_LEVEL_CONFLICT;
 490                         if (sl == 1) {
 491                                 in_options |= NCP_SECURITY_LEVEL_SIGN_HEADERS;
 492                                 error = 1;
 493                         }
 494                 }
 495                 if (error) {
 496                         error = ncp_negotiate_size_and_options(conn,
 497                             buffsize, in_options, &neg_buffsize, &options);
 498                         if ((options ^ in_options) & 3) {
 499                                 return NWE_SIGNATURE_LEVEL_CONFLICT;
 500                         }
 501                 }
 502         } else {
 503                 in_options &= ~NCP_SECURITY_LEVEL_SIGN_HEADERS;
 504                 error = ncp_negotiate_buffersize(conn, NCP_DEFAULT_BUFSIZE,
 505                               &neg_buffsize);
 506         }
 507         if (error) return error;
 508         if ((neg_buffsize < 512) || (neg_buffsize > NCP_MAX_BUFSIZE))
 509                 return EINVAL;
 510         conn->buffer_size = neg_buffsize;
 511         if (in_options & NCP_SECURITY_LEVEL_SIGN_HEADERS)
 512                 conn->flags |= NCPFL_SIGNWANTED;
 513 #ifdef IPX
 514         ncp_sock_checksum(conn, in_options & NCP_IPX_CHECKSUM);
 515 #endif
 516         return 0;
 517 }
 518
 519 int
 520 ncp_reconnect(struct ncp_conn *conn) {
 521         int error;
 522
 523         /* close any open sockets */
 524         ncp_sock_disconnect(conn);
 525         switch( conn->li.saddr.sa_family ) {
 526 #ifdef IPX
 527             case AF_IPX:
 528                 error = ncp_sock_connect_ipx(conn);
 529                 break;
 530 #endif
 531 #ifdef INET
 532             case AF_INET:
 533                 error = ncp_sock_connect_in(conn);
 534                 break;
 535 #endif
 536             default:
 537                 return EPROTONOSUPPORT;
 538         }
 539         if (!error)
 540                 error = ncp_ncp_connect(conn);
 541         return error;
 542 }
 543
 544 /*
 545  * Create conn structure and try to do low level connect
 546  * Server addr should be filled in.
 547  */
 548 int
 549 ncp_connect(struct ncp_conn_args *li, struct thread *td, struct ucred *cred,
 550         struct ncp_conn **aconn)
 551 {
 552         struct ncp_conn *conn;
 553         struct ucred *owner;
 554         int error, isroot;
 555
 556         if (li->saddr.sa_family != AF_INET && li->saddr.sa_family != AF_IPX)
 557                 return EPROTONOSUPPORT;
 558         isroot = ncp_suser(cred) == 0;
 559         /*
 560          * Only root can change ownership
 561          */
 562         if (li->owner != NCP_DEFAULT_OWNER && !isroot)
 563                 return EPERM;
 564         if (li->group != NCP_DEFAULT_GROUP &&
 565             !groupmember(li->group, cred) && !isroot)
 566                 return EPERM;
 567         if (li->owner != NCP_DEFAULT_OWNER) {
 568                 owner = crget();
 569                 owner->cr_uid = li->owner;
 570         } else {
 571                 owner = crhold(cred);
 572         }
 573         error = ncp_conn_alloc(td, owner, &conn);
 574         if (error)
 575                 return (error);
 576         if (error) {
 577                 ncp_conn_free(conn);
 578                 return error;
 579         }
 580         conn->li = *li;
 581         conn->nc_group = (li->group != NCP_DEFAULT_GROUP) ?
 582                 li->group : cred->cr_groups[0];
 583
 584         if (li->retry_count == 0)
 585                 conn->li.retry_count = NCP_RETRY_COUNT;
 586         if (li->timeout == 0)
 587                 conn->li.timeout = NCP_RETRY_TIMEOUT;
 588         error = ncp_reconnect(conn);
 589         if (error) {
 590                 ncp_disconnect(conn);
 591         } else {
 592                 *aconn=conn;
 593         }
 594         return error;
 595 }
 596 /*
 597  * Break connection and deallocate memory
 598  */
 599 int
 600 ncp_disconnect(struct ncp_conn *conn) {
 601
 602         if (ncp_conn_access(conn,conn->ucred,NCPM_WRITE))
 603                 return EACCES;
 604         if (conn->ref_cnt != 0) return EBUSY;
 605         if (conn->flags & NCPFL_PERMANENT) return EBUSY;
 606         if (ncp_conn_valid(conn)) {
 607                 ncp_ncp_disconnect(conn);
 608         }
 609         ncp_sock_disconnect(conn);
 610         ncp_conn_free(conn);
 611         return 0;
 612 }
 613
 614 void
 615 ncp_check_rq(struct ncp_conn *conn){
 616         return;
 617         if (conn->flags & NCPFL_INTR) return;
 618         /* first, check for signals */
 619         if (ncp_chkintr(conn,conn->td)) {
 620                 conn->flags |= NCPFL_INTR;
 621         }
 622         return;
 623 }