sys/netncp/ncp_conn.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  * Connection tables
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <sys/param.h>
  39 #include <sys/systm.h>
  40 #include <sys/kernel.h>
  41 #include <sys/malloc.h>
  42 #include <sys/priv.h>
  43 #include <sys/proc.h>
  44 #include <sys/lock.h>
  45 #include <sys/sysctl.h>
  46
  47 #include <netncp/ncp.h>
  48 #include <netncp/nwerror.h>
  49 #include <netncp/ncp_subr.h>
  50 #include <netncp/ncp_conn.h>
  51 #include <netncp/ncp_sock.h>
  52 #include <netncp/ncp_ncp.h>
  53
  54 SLIST_HEAD(ncp_handle_head,ncp_handle);
  55
  56 int ncp_burst_enabled = 1;
  57
  58 struct ncp_conn_head conn_list={NULL};
  59 static int ncp_conn_cnt = 0;
  60 static int ncp_next_ref = 1;
  61 static struct lock listlock;
  62
  63 struct ncp_handle_head lhlist={NULL};
  64 static int ncp_next_handle = 1;
  65 static struct lock lhlock;
  66
  67 static int ncp_sysctl_connstat(SYSCTL_HANDLER_ARGS);
  68 static int ncp_conn_lock_any(struct ncp_conn *conn, struct thread *td,
  69     struct ucred *cred);
  70
  71 SYSCTL_DECL(_net_ncp);
  72 SYSCTL_INT (_net_ncp, OID_AUTO, burst_enabled, CTLFLAG_RD, &ncp_burst_enabled, 0, "");
  73 SYSCTL_INT (_net_ncp, OID_AUTO, conn_cnt, CTLFLAG_RD, &ncp_conn_cnt, 0, "");
  74 SYSCTL_PROC(_net_ncp, OID_AUTO, conn_stat, CTLFLAG_RD|CTLTYPE_OPAQUE,
  75             NULL, 0, ncp_sysctl_connstat, "S,connstat", "Connections list");
  76
  77 MALLOC_DEFINE(M_NCPDATA, "ncp_data", "NCP private data");
  78
  79 int
  80 ncp_conn_init(void)
  81 {
  82         lockinit(&listlock, PSOCK, "ncpll", 0, 0);
  83         lockinit(&lhlock, PSOCK, "ncplh", 0, 0);
  84         return 0;
  85 }
  86
  87 int
  88 ncp_conn_destroy(void)
  89 {
  90         if (ncp_conn_cnt) {
  91                 NCPERROR("There are %d connections active\n", ncp_conn_cnt);
  92                 return EBUSY;
  93         }
  94         lockdestroy(&listlock);
  95         lockdestroy(&lhlock);
  96         return 0;
  97 }
  98
  99 int
 100 ncp_conn_locklist(int flags, struct thread *td)
 101 {
 102         return lockmgr(&listlock, flags | LK_CANRECURSE, 0);
 103 }
 104
 105 void
 106 ncp_conn_unlocklist(struct thread *td)
 107 {
 108         lockmgr(&listlock, LK_RELEASE, 0);
 109 }
 110
 111 int
 112 ncp_conn_access(struct ncp_conn *conn, struct ucred *cred, mode_t mode)
 113 {
 114         int error;
 115
 116         if (cred == NOCRED || ncp_suser(cred) == 0 ||
 117             cred->cr_uid == conn->nc_owner->cr_uid)
 118                 return 0;
 119         mode >>= 3;
 120         if (!groupmember(conn->nc_group, cred))
 121                 mode >>= 3;
 122         error = (conn->li.access_mode & mode) == mode ? 0 : EACCES;
 123         return error;
 124 }
 125
 126 int
 127 ncp_conn_lock_any(struct ncp_conn *conn, struct thread *td, struct ucred *cred)
 128 {
 129         int error;
 130
 131         if (conn->nc_id == 0) return EACCES;
 132         error = lockmgr(&conn->nc_lock, LK_EXCLUSIVE | LK_CANRECURSE, 0);
 133         if (error == ERESTART)
 134                 return EINTR;
 135         error = ncp_chkintr(conn, td);
 136         if (error) {
 137                 lockmgr(&conn->nc_lock, LK_RELEASE, 0);
 138                 return error;
 139         }
 140
 141         if (conn->nc_id == 0) {
 142                 lockmgr(&conn->nc_lock, LK_RELEASE, 0);
 143                 return EACCES;
 144         }
 145         conn->td = td;          /* who currently operates */
 146         conn->ucred = cred;
 147         return 0;
 148 }
 149
 150 int
 151 ncp_conn_lock(struct ncp_conn *conn, struct thread *td, struct ucred *cred, int mode)
 152 {
 153         int error;
 154
 155         error = ncp_conn_access(conn, cred, mode);
 156         if (error) return error;
 157         return ncp_conn_lock_any(conn, td, cred);
 158 }
 159
 160 /*
 161  * Lock conn but unlock connlist
 162  */
 163 static int
 164 ncp_conn_lock2(struct ncp_conn *conn, struct thread *td, struct ucred *cred, int mode)
 165 {
 166         int error;
 167
 168         error = ncp_conn_access(conn, cred, mode);
 169         if (error) {
 170                 ncp_conn_unlocklist(td);
 171                 return error;
 172         }
 173         conn->nc_lwant++;
 174         ncp_conn_unlocklist(td);
 175         error = ncp_conn_lock_any(conn, td, cred);
 176         conn->nc_lwant--;
 177         if (conn->nc_lwant == 0) {
 178                 wakeup(&conn->nc_lwant);
 179         }
 180         return error;
 181 }
 182
 183 void
 184 ncp_conn_unlock(struct ncp_conn *conn, struct thread *td)
 185 {
 186         /*
 187          * note, that LK_RELASE will do wakeup() instead of wakeup_one().
 188          * this will do a little overhead
 189          */
 190         lockmgr(&conn->nc_lock, LK_RELEASE, 0);
 191 }
 192
 193 int
 194 ncp_conn_assert_locked(struct ncp_conn *conn, const char *checker, struct thread *td)
 195 {
 196         if (lockstatus(&conn->nc_lock) == LK_EXCLUSIVE) return 0;
 197         printf("%s: connection isn't locked!\n", checker);
 198         return EIO;
 199 }
 200
 201 void
 202 ncp_conn_invalidate(struct ncp_conn *ncp)
 203 {
 204         ncp->flags &= ~(NCPFL_ATTACHED | NCPFL_LOGGED | NCPFL_INVALID);
 205 }
 206
 207 int
 208 ncp_conn_invalid(struct ncp_conn *ncp)
 209 {
 210         return ncp->flags & NCPFL_INVALID;
 211 }
 212
 213 /*
 214  * create, fill with defaults and return in locked state
 215  */
 216 int
 217 ncp_conn_alloc(struct ncp_conn_args *cap, struct thread *td, struct ucred *cred,
 218         struct ncp_conn **conn)
 219 {
 220         struct ncp_conn *ncp;
 221         struct ucred *owner;
 222         int error, isroot;
 223
 224         if (cap->saddr.sa_family != AF_INET && cap->saddr.sa_family != AF_IPX)
 225                 return EPROTONOSUPPORT;
 226         /*
 227          * Only root can change ownership.
 228          */
 229         isroot = ncp_suser(cred) == 0;
 230         if (cap->owner != NCP_DEFAULT_OWNER && !isroot)
 231                 return EPERM;
 232         if (cap->group != NCP_DEFAULT_GROUP &&
 233             !groupmember(cap->group, cred) && !isroot)
 234                 return EPERM;
 235         if (cap->owner != NCP_DEFAULT_OWNER) {
 236                 owner = crget();
 237                 crcopy(owner, cred);
 238                 owner->cr_uid = cap->owner;
 239         } else
 240                 owner = crhold(cred);
 241         MALLOC(ncp, struct ncp_conn *, sizeof(struct ncp_conn),
 242             M_NCPDATA, M_WAITOK | M_ZERO);
 243         error = 0;
 244         lockinit(&ncp->nc_lock, PZERO, "ncplck", 0, 0);
 245         ncp_conn_cnt++;
 246         ncp->nc_id = ncp_next_ref++;
 247         ncp->nc_owner = owner;
 248         ncp->seq = 0;
 249         ncp->connid = 0xFFFF;
 250         ncp->li = *cap;
 251         ncp->nc_group = (cap->group != NCP_DEFAULT_GROUP) ?
 252                 cap->group : cred->cr_groups[0];
 253
 254         if (cap->retry_count == 0)
 255                 ncp->li.retry_count = NCP_RETRY_COUNT;
 256         if (cap->timeout == 0)
 257                 ncp->li.timeout = NCP_RETRY_TIMEOUT;
 258         ncp_conn_lock_any(ncp, td, ncp->nc_owner);
 259         *conn = ncp;
 260         ncp_conn_locklist(LK_EXCLUSIVE, td);
 261         SLIST_INSERT_HEAD(&conn_list,ncp,nc_next);
 262         ncp_conn_unlocklist(td);
 263         return (error);
 264 }
 265
 266 /*
 267  * Remove the connection, on entry it must be locked
 268  */
 269 int
 270 ncp_conn_free(struct ncp_conn *ncp)
 271 {
 272         struct thread *td;
 273         int error;
 274
 275         if (ncp == NULL) {
 276                 NCPFATAL("ncp == NULL\n");
 277                 return 0;
 278         }
 279         if (ncp->nc_id == 0) {
 280                 NCPERROR("nc_id == 0\n");
 281                 return EACCES;
 282         }
 283         td = ncp->td;
 284         error = ncp_conn_assert_locked(ncp, __func__, td);
 285         if (error)
 286                 return error;
 287         if (ncp->ref_cnt != 0 || (ncp->flags & NCPFL_PERMANENT))
 288                 return EBUSY;
 289         if (ncp_conn_access(ncp, ncp->ucred, NCPM_WRITE))
 290                 return EACCES;
 291
 292         if (ncp->flags & NCPFL_ATTACHED)
 293                 ncp_ncp_disconnect(ncp);
 294         ncp_sock_disconnect(ncp);
 295
 296         /*
 297          * Mark conn as dead and wait for other process
 298          */
 299         ncp->nc_id = 0;
 300         ncp_conn_unlock(ncp, td);
 301         /*
 302          * if signal is raised - how I do react ?
 303          */
 304         lockmgr(&ncp->nc_lock, LK_DRAIN, 0);
 305         lockmgr(&ncp->nc_lock, LK_RELEASE, 0);
 306         lockdestroy(&ncp->nc_lock);
 307         while (ncp->nc_lwant) {
 308                 printf("lwant = %d\n", ncp->nc_lwant);
 309                 tsleep(&ncp->nc_lwant, PZERO,"ncpdr",2*hz);
 310         }
 311         ncp_conn_locklist(LK_EXCLUSIVE, td);
 312         SLIST_REMOVE(&conn_list, ncp, ncp_conn, nc_next);
 313         ncp_conn_cnt--;
 314         ncp_conn_unlocklist(td);
 315         if (ncp->li.user)
 316                 free(ncp->li.user, M_NCPDATA);
 317         if (ncp->li.password)
 318                 free(ncp->li.password, M_NCPDATA);
 319         crfree(ncp->nc_owner);
 320         FREE(ncp, M_NCPDATA);
 321         return (0);
 322 }
 323
 324 int
 325 ncp_conn_reconnect(struct ncp_conn *ncp)
 326 {
 327         int error;
 328
 329         /*
 330          * Close opened sockets if any
 331          */
 332         ncp_sock_disconnect(ncp);
 333         error = ncp_sock_connect(ncp);
 334         if (error)
 335                 return error;
 336         error = ncp_ncp_connect(ncp);
 337         if (error)
 338                 return error;
 339         error = ncp_renegotiate_connparam(ncp, NCP_DEFAULT_BUFSIZE, 0);
 340         if (error == NWE_SIGNATURE_LEVEL_CONFLICT) {
 341                 printf("Unable to negotiate requested security level\n");
 342                 error = EOPNOTSUPP;
 343         }
 344         if (error) {
 345                 ncp_ncp_disconnect(ncp);
 346                 return error;
 347         }
 348 #ifdef NCPBURST
 349         error = ncp_burst_connect(ncp);
 350         if (error) {
 351                 ncp_ncp_disconnect(ncp);
 352                 return error;
 353         }
 354 #endif
 355         return 0;
 356 }
 357
 358 int
 359 ncp_conn_login(struct ncp_conn *conn, struct thread *td, struct ucred *cred)
 360 {
 361         struct ncp_bindery_object user;
 362         u_char ncp_key[8];
 363         int error;
 364
 365         error = ncp_get_encryption_key(conn, ncp_key);
 366         if (error) {
 367                 printf("%s: Warning: use unencrypted login\n", __func__);
 368                 error = ncp_login_unencrypted(conn, conn->li.objtype,
 369                     conn->li.user, conn->li.password, td, cred);
 370         } else {
 371                 error = ncp_get_bindery_object_id(conn, conn->li.objtype,
 372                     conn->li.user, &user, td, cred);
 373                 if (error)
 374                         return error;
 375                 error = ncp_login_encrypted(conn, &user, ncp_key,
 376                     conn->li.password, td, cred);
 377         }
 378         if (!error)
 379                 conn->flags |= NCPFL_LOGGED | NCPFL_WASLOGGED;
 380         return error;
 381 }
 382
 383 /*
 384  * Lookup connection by handle, return a locked conn descriptor
 385  */
 386 int
 387 ncp_conn_getbyref(int ref, struct thread *td, struct ucred *cred, int mode,
 388                   struct ncp_conn **connpp)
 389 {
 390         struct ncp_conn *ncp;
 391         int error = 0;
 392
 393         ncp_conn_locklist(LK_SHARED, td);
 394         SLIST_FOREACH(ncp, &conn_list, nc_next)
 395                 if (ncp->nc_id == ref) break;
 396         if (ncp == NULL) {
 397                 ncp_conn_unlocklist(td);
 398                 return(EBADF);
 399         }
 400         error = ncp_conn_lock2(ncp, td, cred, mode);
 401         if (!error)
 402                 *connpp = ncp;
 403         return (error);
 404 }
 405 /*
 406  * find attached, but not logged in connection to specified server
 407  */
 408 int
 409 ncp_conn_getattached(struct ncp_conn_args *li, struct thread *td,
 410                      struct ucred *cred, int mode, struct ncp_conn **connpp)
 411 {
 412         struct ncp_conn *ncp, *ncp2 = NULL;
 413         int error = 0;
 414
 415         ncp_conn_locklist(LK_SHARED, td);
 416         SLIST_FOREACH(ncp, &conn_list, nc_next) {
 417                 if ((ncp->flags & NCPFL_LOGGED) != 0 ||
 418                     strcmp(ncp->li.server,li->server) != 0 ||
 419                     ncp->li.saddr.sa_len != li->saddr.sa_len ||
 420                     bcmp(&ncp->li.saddr,&ncp->li.saddr,li->saddr.sa_len) != 0)
 421                         continue;
 422                 if (ncp_suser(cred) == 0 ||
 423                     cred->cr_uid == ncp->nc_owner->cr_uid)
 424                         break;
 425                 error = ncp_conn_access(ncp,cred,mode);
 426                 if (!error && ncp2 == NULL)
 427                         ncp2 = ncp;
 428         }
 429         if (ncp == NULL) ncp = ncp2;
 430         if (ncp == NULL) {
 431                 ncp_conn_unlocklist(td);
 432                 return(EBADF);
 433         }
 434         error = ncp_conn_lock2(ncp, td, cred, mode);
 435         if (!error)
 436                 *connpp=ncp;
 437         return (error);
 438 }
 439
 440 /*
 441  * Lookup connection by server/user pair, return a locked conn descriptor.
 442  * if li is NULL or server/user pair incomplete, try to select best connection
 443  * based on owner.
 444  * Connection selected in next order:
 445  * 1. Try to search conn with ucred owner, if li is NULL also find a primary
 446  * 2. If 1. fails try to get first suitable shared connection
 447  * 3. If 2. fails then nothing can help to poor ucred owner
 448  */
 449
 450 int
 451 ncp_conn_getbyli(struct ncp_conn_args *li, struct thread *td,
 452                  struct ucred *cred, int mode, struct ncp_conn **connpp)
 453 {
 454         struct ncp_conn *ncp, *ncp2 = NULL;
 455         int error = 0, partial, haveserv;
 456
 457         partial = (li == NULL || li->server[0] == 0 || li->user == NULL);
 458         haveserv = (li && li->server[0]);
 459         ncp_conn_locklist(LK_SHARED, td);
 460         SLIST_FOREACH(ncp, &conn_list, nc_next) {
 461                 if (partial) {
 462                         if (cred->cr_uid == ncp->nc_owner->cr_uid) {
 463                                 if (haveserv) {
 464                                         if (strcmp(ncp->li.server,li->server) == 0)
 465                                                 break;
 466                                 } else {
 467                                         if (ncp->flags & NCPFL_PRIMARY)
 468                                                 break;
 469                                         ncp2 = ncp;
 470                                 }
 471                                 continue;
 472                         }
 473                 } else {
 474                         if (strcmp(ncp->li.server,li->server) != 0 ||
 475                             ncp->li.user == NULL ||
 476                             strcmp(ncp->li.user,li->user) != 0)
 477                                 continue;
 478                         if (cred->cr_uid == ncp->nc_owner->cr_uid)
 479                                 break;
 480                         if (ncp_suser(cred) == 0)
 481                                 ncp2 = ncp;
 482                 }
 483                 error = ncp_conn_access(ncp,cred,mode);
 484                 if (!error && ncp2 == NULL)
 485                         ncp2 = ncp;
 486         }
 487         if (ncp == NULL) ncp = ncp2;
 488         if (ncp == NULL) {
 489                 ncp_conn_unlocklist(td);
 490                 return(EBADF);
 491         }
 492         error = ncp_conn_lock2(ncp, td, cred,mode);
 493         if (!error)
 494                 *connpp=ncp;
 495         return (error);
 496 }
 497
 498 /*
 499  * Set primary connection flag, since it have sence only for an owner,
 500  * only owner can modify this flag.
 501  * connection expected to be locked.
 502  */
 503 int
 504 ncp_conn_setprimary(struct ncp_conn *conn, int on)
 505 {
 506         struct ncp_conn *ncp=NULL;
 507
 508         if (conn->ucred->cr_uid != conn->nc_owner->cr_uid)
 509                 return EACCES;
 510         ncp_conn_locklist(LK_SHARED, conn->td);
 511         SLIST_FOREACH(ncp, &conn_list, nc_next) {
 512                 if (conn->ucred->cr_uid == ncp->nc_owner->cr_uid)
 513                         ncp->flags &= ~NCPFL_PRIMARY;
 514         }
 515         ncp_conn_unlocklist(conn->td);
 516         if (on)
 517                 conn->flags |= NCPFL_PRIMARY;
 518         return 0;
 519 }
 520 /*
 521  * Lease conn to given proc, returning unique handle
 522  * problem: how locks should be applied ?
 523  */
 524 int
 525 ncp_conn_gethandle(struct ncp_conn *conn, struct thread *td, struct ncp_handle **handle)
 526 {
 527         struct ncp_handle *refp;
 528
 529         lockmgr(&lhlock, LK_EXCLUSIVE, 0);
 530         SLIST_FOREACH(refp, &lhlist, nh_next)
 531                 if (refp->nh_conn == conn && td == refp->nh_td) break;
 532         if (refp) {
 533                 conn->ref_cnt++;
 534                 refp->nh_ref++;
 535                 *handle = refp;
 536                 lockmgr(&lhlock, LK_RELEASE, 0);
 537                 return 0;
 538         }
 539         MALLOC(refp,struct ncp_handle *,sizeof(struct ncp_handle),M_NCPDATA,
 540             M_WAITOK | M_ZERO);
 541         SLIST_INSERT_HEAD(&lhlist,refp,nh_next);
 542         refp->nh_ref++;
 543         refp->nh_td = td;
 544         refp->nh_conn = conn;
 545         refp->nh_id = ncp_next_handle++;
 546         *handle = refp;
 547         conn->ref_cnt++;
 548         lockmgr(&lhlock, LK_RELEASE, 0);
 549         return 0;
 550 }
 551 /*
 552  * release reference, if force - ignore refcount
 553  */
 554 int
 555 ncp_conn_puthandle(struct ncp_handle *handle, struct thread *td, int force)
 556 {
 557         struct ncp_handle *refp = handle;
 558
 559         lockmgr(&lhlock, LK_EXCLUSIVE, 0);
 560         refp->nh_ref--;
 561         refp->nh_conn->ref_cnt--;
 562         if (force) {
 563                 refp->nh_conn->ref_cnt -= refp->nh_ref;
 564                 refp->nh_ref = 0;
 565         }
 566         if (refp->nh_ref == 0) {
 567                 SLIST_REMOVE(&lhlist, refp, ncp_handle, nh_next);
 568                 FREE(refp, M_NCPDATA);
 569         }
 570         lockmgr(&lhlock, LK_RELEASE, 0);
 571         return 0;
 572 }
 573 /*
 574  * find a connHandle
 575  */
 576 int
 577 ncp_conn_findhandle(int connHandle, struct thread *td, struct ncp_handle **handle) {
 578         struct ncp_handle *refp;
 579
 580         lockmgr(&lhlock, LK_SHARED, 0);
 581         SLIST_FOREACH(refp, &lhlist, nh_next)
 582                 if (refp->nh_td == td && refp->nh_id == connHandle) break;
 583         lockmgr(&lhlock, LK_RELEASE, 0);
 584         if (refp == NULL) {
 585                 return EBADF;
 586         }
 587         *handle = refp;
 588         return 0;
 589 }
 590 /*
 591  * Clear handles associated with specified process
 592  */
 593 int
 594 ncp_conn_putprochandles(struct thread *td)
 595 {
 596         struct ncp_handle *hp, *nhp;
 597         int haveone = 0;
 598
 599         lockmgr(&lhlock, LK_EXCLUSIVE, 0);
 600         for (hp = SLIST_FIRST(&lhlist); hp; hp = nhp) {
 601                 nhp = SLIST_NEXT(hp, nh_next);
 602                 if (hp->nh_td != td) continue;
 603                 haveone = 1;
 604                 hp->nh_conn->ref_cnt -= hp->nh_ref;
 605                 SLIST_REMOVE(&lhlist, hp, ncp_handle, nh_next);
 606                 FREE(hp, M_NCPDATA);
 607         }
 608         lockmgr(&lhlock, LK_RELEASE, 0);
 609         return haveone;
 610 }
 611 /*
 612  * remove references in all possible connections,
 613  * XXX - possible problem is a locked list.
 614  */
 615 /*void
 616 ncp_conn_list_rm_ref(pid_t pid) {
 617         struct ncp_conn *ncp;
 618
 619         ncp_conn_locklist(LK_SHARED, NULL);
 620         SLIST_FOREACH(ncp, &conn_list, nc_next) {
 621                 ncp_conn_rm_ref(ncp,pid,1);
 622         }
 623         ncp_conn_unlocklist(NULL);
 624         return;
 625 }
 626 */
 627 int
 628 ncp_conn_getinfo(struct ncp_conn *ncp, struct ncp_conn_stat *ncs) {
 629         bzero(ncs,sizeof(*ncs));
 630         ncs->li = ncp->li;
 631         ncs->li.user = ncs->user;
 632         if (ncp->li.user)
 633                 strcpy(ncs->user, ncp->li.user);
 634         ncs->li.password = NULL;
 635         ncs->connRef = ncp->nc_id;
 636         ncs->ref_cnt = ncp->ref_cnt;
 637         ncs->connid = ncp->connid;
 638         ncs->owner = ncp->nc_owner->cr_uid;
 639         ncs->group = ncp->nc_group;
 640         ncs->flags = ncp->flags;
 641         ncs->buffer_size = ncp->buffer_size;
 642         return 0;
 643 }
 644
 645 static int
 646 ncp_sysctl_connstat(SYSCTL_HANDLER_ARGS)
 647 {
 648         int error;
 649         struct ncp_conn_stat ncs;
 650         struct ncp_conn *ncp;
 651 /*      struct ucred *cred = req->td->td_ucred;*/
 652
 653         error = sysctl_wire_old_buffer(req, 0);
 654         if (error != 0)
 655                 return (error);
 656         ncp_conn_locklist(LK_SHARED, req->td);
 657         error = SYSCTL_OUT(req, &ncp_conn_cnt, sizeof(ncp_conn_cnt));
 658         SLIST_FOREACH(ncp, &conn_list, nc_next) {
 659                 if (error) break;
 660                 /* I can't do conn_lock while list is locked */
 661                 ncp->nc_lwant++;
 662                 ncp_conn_getinfo(ncp, &ncs);
 663                 ncp->nc_lwant--;
 664                 error = SYSCTL_OUT(req, &ncs, sizeof(ncs));
 665         }
 666         ncp_conn_unlocklist(req->td);
 667         return(error);
 668 }