sys/vfs/nwfs/nwfs_subr.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/nwfs/nwfs_subr.c,v 1.2.2.2 2000/10/25 02:11:10 bp Exp $
  33  * $DragonFly: src/sys/vfs/nwfs/nwfs_subr.c,v 1.8 2006/12/23 00:41:30 swildner Exp $
  34  */
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/malloc.h>
  39 #include <machine/clock.h>
  40 #include <sys/time.h>
  41
  42 #include <netproto/ncp/ncp.h>
  43 #include <netproto/ncp/ncp_conn.h>
  44 #include <netproto/ncp/ncp_ncp.h>
  45 #include <netproto/ncp/ncp_subr.h>
  46 #include <netproto/ncp/ncp_rq.h>
  47 #include <netproto/ncp/nwerror.h>
  48
  49 #include "nwfs.h"
  50 #include "nwfs_node.h"
  51 #include "nwfs_subr.h"
  52
  53 MALLOC_DEFINE(M_NWFSDATA, "NWFS data", "NWFS private data");
  54
  55 static void
  56 ncp_extract_file_info(struct nwmount *nmp, struct ncp_rq *rqp,
  57                       struct nw_entry_info *target)
  58 {
  59         u_char name_len;
  60         const int info_struct_size = sizeof(struct nw_entry_info) - 257;
  61
  62         ncp_rp_mem(rqp,(caddr_t)target,info_struct_size);
  63         name_len = ncp_rp_byte(rqp);
  64         target->nameLen = name_len;
  65         ncp_rp_mem(rqp,(caddr_t)target->entryName, name_len);
  66         target->entryName[name_len] = '\0';
  67         ncp_path2unix(target->entryName, target->entryName, name_len, &nmp->m.nls);
  68         return;
  69 }
  70
  71 static void
  72 ncp_update_file_info(struct nwmount *nmp, struct ncp_rq *rqp,
  73                      struct nw_entry_info *target)
  74 {
  75         int info_struct_size = sizeof(struct nw_entry_info) - 257;
  76
  77         ncp_rp_mem(rqp,(caddr_t)target,info_struct_size);
  78         return;
  79 }
  80
  81 int
  82 ncp_initsearch(struct vnode *dvp, struct thread *td, struct ucred *cred)
  83 {
  84         struct nwmount *nmp = VTONWFS(dvp);
  85         struct ncp_conn *conn = NWFSTOCONN(nmp);
  86         struct nwnode *np = VTONW(dvp);
  87         u_int8_t volnum = nmp->n_volume;
  88         u_int32_t dirent = np->n_fid.f_id;
  89         int error;
  90         DECLARE_RQ;
  91
  92         NCPNDEBUG("vol=%d,dir=%d\n", volnum, dirent);
  93         NCP_RQ_HEAD(87,td,cred);
  94         ncp_rq_byte(rqp, 2);            /* subfunction */
  95         ncp_rq_byte(rqp, nmp->name_space);
  96         ncp_rq_byte(rqp, 0);            /* reserved */
  97         ncp_rq_dbase_path(rqp, volnum, dirent, 0, NULL, NULL);
  98         checkbad(ncp_request(conn,rqp));
  99         ncp_rp_mem(rqp,(caddr_t)&np->n_seq, sizeof(np->n_seq));
 100         NCP_RQ_EXIT;
 101         return error;
 102 }
 103
 104 int
 105 ncp_search_for_file_or_subdir(struct nwmount *nmp,
 106                               struct nw_search_seq *seq,
 107                               struct nw_entry_info *target,
 108                               struct thread *td, struct ucred *cred)
 109 {
 110         struct ncp_conn *conn = NWFSTOCONN(nmp);
 111         int error;
 112         DECLARE_RQ;
 113
 114         NCP_RQ_HEAD(87,td,cred);
 115         ncp_rq_byte(rqp, 3);            /* subfunction */
 116         ncp_rq_byte(rqp, nmp->name_space);
 117         ncp_rq_byte(rqp, 0);            /* data stream */
 118         ncp_rq_word_lh(rqp, 0xffff);    /* Search attribs */
 119         ncp_rq_dword(rqp, IM_ALL);      /* return info mask */
 120         ncp_rq_mem(rqp, (caddr_t)seq, 9);
 121         ncp_rq_byte(rqp, 2);            /* 2 byte pattern */
 122         ncp_rq_byte(rqp, 0xff);         /* following is a wildcard */
 123         ncp_rq_byte(rqp, '*');
 124         checkbad(ncp_request(conn,rqp));
 125         ncp_rp_mem(rqp,(caddr_t)seq, sizeof(*seq));
 126         ncp_rp_byte(rqp);               /* skip */
 127         ncp_extract_file_info(nmp, rqp, target);
 128         NCP_RQ_EXIT;
 129         return error;
 130 }
 131
 132 /*
 133  * Returns information for a (one-component) name relative to the specified
 134  * directory.
 135  */
 136 int
 137 ncp_obtain_info(struct nwmount *nmp, u_int32_t dirent,
 138                 int namelen, char *path, struct nw_entry_info *target,
 139                 struct thread *td, struct ucred *cred)
 140 {
 141         struct ncp_conn *conn=NWFSTOCONN(nmp);
 142         int error;
 143         u_char volnum = nmp->n_volume, ns;
 144         DECLARE_RQ;
 145
 146         if (target == NULL) {
 147                 NCPFATAL("target == NULL\n");
 148                 return EINVAL;
 149         }
 150         ns = (path == NULL || path[0] == 0) ? NW_NS_DOS : nmp->name_space;
 151         NCP_RQ_HEAD(87, td, cred);
 152         ncp_rq_byte(rqp, 6);                    /* subfunction */
 153         ncp_rq_byte(rqp, ns);
 154         ncp_rq_byte(rqp, ns);   /* DestNameSpace */
 155         ncp_rq_word(rqp, htons(0xff00));        /* get all */
 156         ncp_rq_dword(rqp, IM_ALL);
 157         ncp_rq_dbase_path(rqp, volnum, dirent, namelen, path, &nmp->m.nls);
 158         checkbad(ncp_request(conn,rqp));
 159         if (path)
 160                 ncp_extract_file_info(nmp, rqp, target);
 161         else
 162                 ncp_update_file_info(nmp, rqp, target);
 163         NCP_RQ_EXIT;
 164         return error;
 165 }
 166 /*
 167  * lookup name pointed by cnp in directory dvp and return file info in np.
 168  * May be I should create a little cache, but another way is to minimize
 169  * number of calls, on other hand, in multiprocess environment ...
 170  */
 171 int
 172 ncp_lookup(struct vnode *dvp, int len, char *name, struct nw_entry_info *fap,
 173            struct thread *td, struct ucred *cred)
 174 {
 175         struct nwmount *nmp;
 176         struct nwnode *dnp = VTONW(dvp);
 177         struct ncp_conn *conn;
 178         int error;
 179
 180         if (!dvp || dvp->v_type != VDIR) {
 181                 nwfs_printf("dvp is NULL or not a directory.\n");
 182                 return (ENOENT);
 183         }
 184         nmp = VTONWFS(dvp);
 185         conn = NWFSTOCONN(nmp);
 186
 187         if (len == 1 && name[0] == '.') {
 188                 if (strcmp(dnp->n_name, NWFS_ROOTVOL) == 0) {
 189                         error = ncp_obtain_info(nmp, dnp->n_fid.f_id, 0, NULL,
 190                                 fap, td, cred);
 191                 } else {
 192                         error = ncp_obtain_info(nmp, dnp->n_fid.f_parent,
 193                                 dnp->n_nmlen, dnp->n_name, fap, td, cred);
 194                 }
 195                 return error;
 196         } else if (len == 2 && name[0] == '.' && name[1] == '.') {
 197                 kprintf("%s: knows NOTHING about '..'\n", __func__);
 198                 return EIO;
 199         } else {
 200                 error = ncp_obtain_info(nmp, dnp->n_fid.f_id,
 201                         len, name, fap, td, cred);
 202         }
 203         return error;
 204 }
 205
 206 static void ConvertToNWfromDWORD(u_int32_t sfd, ncp_fh *fh);
 207 static void
 208 ConvertToNWfromDWORD(u_int32_t sfd, ncp_fh *fh) {
 209         fh->val1 = (fh->val.val32 = sfd);
 210         return;
 211 }
 212
 213 /*
 214  * If both dir and name are NULL, then in target there's already a looked-up
 215  * entry that wants to be opened.
 216  */
 217 int
 218 ncp_open_create_file_or_subdir(struct nwmount *nmp, struct vnode *dvp,
 219                                int namelen, char *name, int open_create_mode,
 220                                u_int32_t create_attributes,
 221                                int desired_acc_rights,
 222                                struct ncp_open_info *nop,
 223                                struct thread *td, struct ucred *cred)
 224 {
 225
 226         struct ncp_conn *conn=NWFSTOCONN(nmp);
 227         u_int16_t search_attribs = SA_ALL & (~SA_SUBDIR_FILES);
 228         u_int8_t volnum;
 229         u_int32_t dirent;
 230         int error;
 231         DECLARE_RQ;
 232
 233         volnum = nmp->n_volume;
 234         dirent = VTONW(dvp)->n_fid.f_id;
 235         if ((create_attributes & aDIR) != 0) {
 236                 search_attribs |= SA_SUBDIR_FILES;
 237         }
 238         NCP_RQ_HEAD(87,td,cred);
 239         ncp_rq_byte(rqp, 1);/* subfunction */
 240         ncp_rq_byte(rqp, nmp->name_space);
 241         ncp_rq_byte(rqp, open_create_mode);
 242         ncp_rq_word(rqp, search_attribs);
 243         ncp_rq_dword(rqp, IM_ALL);
 244         ncp_rq_dword(rqp, create_attributes);
 245         /*
 246          * The desired acc rights seem to be the inherited rights mask for
 247          * directories
 248          */
 249         ncp_rq_word(rqp, desired_acc_rights);
 250         ncp_rq_dbase_path(rqp, volnum, dirent, namelen, name, &nmp->m.nls);
 251         checkbad(ncp_request(conn,rqp));
 252
 253         nop->origfh = ncp_rp_dword_lh(rqp);
 254         nop->action = ncp_rp_byte(rqp);
 255         ncp_rp_byte(rqp);       /* skip */
 256         ncp_extract_file_info(nmp, rqp, &nop->fattr);
 257         ConvertToNWfromDWORD(nop->origfh, &nop->fh);
 258         NCP_RQ_EXIT;
 259         switch(error) {
 260             case NWE_FILE_NO_CREATE_PRIV:
 261                 error = EACCES;
 262                 break;
 263         }
 264         return error;
 265 }
 266
 267 int
 268 ncp_close_file(struct ncp_conn *conn, ncp_fh *fh, struct thread *td,
 269                struct ucred *cred)
 270 {
 271         int error;
 272         DECLARE_RQ;
 273
 274         NCP_RQ_HEAD(66,td,cred);
 275         ncp_rq_byte(rqp, 0);
 276         ncp_rq_mem(rqp, (caddr_t)fh, 6);
 277         error = ncp_request(conn,rqp);
 278         NCP_RQ_EXIT_NB;
 279         return error;
 280 }
 281
 282 int
 283 ncp_DeleteNSEntry(struct nwmount *nmp, u_int32_t dirent, int namelen,
 284                   char *name, struct thread *td, struct ucred *cred)
 285 {
 286         int error;
 287         struct ncp_conn *conn=NWFSTOCONN(nmp);
 288         DECLARE_RQ;
 289
 290         NCP_RQ_HEAD(87,td,cred);
 291         ncp_rq_byte(rqp, 8);            /* subfunction */
 292         ncp_rq_byte(rqp, nmp->name_space);
 293         ncp_rq_byte(rqp, 0);            /* reserved */
 294         ncp_rq_word(rqp, SA_ALL);       /* search attribs: all */
 295         ncp_rq_dbase_path(rqp, nmp->n_volume, dirent, namelen, name, &nmp->m.nls);
 296         error = ncp_request(conn,rqp);
 297         NCP_RQ_EXIT_NB;
 298         return error;
 299 }
 300
 301 int
 302 ncp_nsrename(struct ncp_conn *conn, int volume, int ns, int oldtype,
 303              struct ncp_nlstables *nt, nwdirent fdir, char *old_name,
 304              int oldlen, nwdirent tdir, char *new_name, int newlen,
 305              struct thread *td, struct ucred *cred)
 306 {
 307         DECLARE_RQ;
 308         int error;
 309
 310         NCP_RQ_HEAD(87,td,cred);
 311         ncp_rq_byte(rqp, 4);
 312         ncp_rq_byte(rqp, ns);
 313         ncp_rq_byte(rqp, 1);
 314         ncp_rq_word(rqp, oldtype);
 315         /* source Handle Path */
 316         ncp_rq_byte(rqp, volume);
 317         ncp_rq_dword(rqp, fdir);
 318         ncp_rq_byte(rqp, 1);
 319         ncp_rq_byte(rqp, 1);    /* 1 source component */
 320         /* dest Handle Path */
 321         ncp_rq_byte(rqp, volume);
 322         ncp_rq_dword(rqp, tdir);
 323         ncp_rq_byte(rqp, 1);
 324         ncp_rq_byte(rqp, 1);    /* 1 destination component */
 325         ncp_rq_pathstring(rqp, oldlen, old_name, nt);
 326         ncp_rq_pathstring(rqp, newlen, new_name, nt);
 327         error = ncp_request(conn,rqp);
 328         NCP_RQ_EXIT_NB;
 329         return error;
 330 }
 331
 332 int
 333 ncp_modify_file_or_subdir_dos_info(struct nwmount *nmp, struct vnode *vp,
 334                                    u_int32_t info_mask,
 335                                    struct nw_modify_dos_info *info,
 336                                    struct thread *td, struct ucred *cred)
 337 {
 338         struct nwnode *np=VTONW(vp);
 339         u_int8_t volnum = nmp->n_volume;
 340         u_int32_t dirent = np->n_fid.f_id;
 341         struct ncp_conn *conn=NWFSTOCONN(nmp);
 342         int             error;
 343         DECLARE_RQ;
 344
 345         NCP_RQ_HEAD(87,td,cred);
 346         ncp_rq_byte(rqp, 7);    /* subfunction */
 347         ncp_rq_byte(rqp, nmp->name_space);
 348         ncp_rq_byte(rqp, 0);    /* reserved */
 349         ncp_rq_word(rqp, htons(0x0680));        /* search attribs: all */
 350         ncp_rq_dword(rqp, info_mask);
 351         ncp_rq_mem(rqp, (caddr_t)info, sizeof(*info));
 352         ncp_rq_dbase_path(rqp, volnum, dirent, 0, NULL, NULL);
 353         error = ncp_request(conn,rqp);
 354         NCP_RQ_EXIT_NB;
 355         return error;
 356 }
 357
 358 int
 359 ncp_setattr(struct vnode *vp, struct vattr *vap, struct ucred *cred,
 360             struct thread *td)
 361 {
 362         struct nwmount *nmp=VTONWFS(vp);
 363         struct nwnode *np=VTONW(vp);
 364         struct ncp_open_info nwn;
 365         struct ncp_conn *conn=NWFSTOCONN(nmp);
 366         struct nw_modify_dos_info info;
 367         int error = 0, info_mask;
 368         DECLARE_RQ;
 369
 370         if (vap->va_size != VNOVAL) {
 371                 error = ncp_open_create_file_or_subdir(
 372                             nmp, vp, 0, NULL, OC_MODE_OPEN, 0,
 373                             AR_WRITE | AR_READ, &nwn,td,cred);
 374                 if (error) return error;
 375                 NCP_RQ_HEAD(73,td,cred);
 376                 ncp_rq_byte(rqp, 0);
 377                 ncp_rq_mem(rqp, (caddr_t)&nwn.fh, 6);
 378                 ncp_rq_dword(rqp, htonl(vap->va_size));
 379                 ncp_rq_word_hl(rqp, 0);
 380                 checkbad(ncp_request(conn,rqp));
 381                 np->n_vattr.va_size = np->n_size = vap->va_size;
 382                 NCP_RQ_EXIT;
 383                 ncp_close_file(conn, &nwn.fh, td, cred);
 384                 if (error) return error;
 385         }
 386         info_mask = 0;
 387         bzero(&info, sizeof(info));
 388
 389         if (vap->va_mtime.tv_sec != VNOVAL) {
 390                 info_mask |= (DM_MODIFY_TIME | DM_MODIFY_DATE);
 391                 ncp_unix2dostime(&vap->va_mtime, nmp->m.tz, &info.modifyDate, &info.modifyTime, NULL);
 392         }
 393         if (vap->va_atime.tv_sec != VNOVAL) {
 394                 info_mask |= (DM_LAST_ACCESS_DATE);
 395                 ncp_unix2dostime(&vap->va_atime, nmp->m.tz, &info.lastAccessDate, NULL, NULL);
 396         }
 397         if (info_mask) {
 398                 error = ncp_modify_file_or_subdir_dos_info(nmp, vp, info_mask, &info,td,cred);
 399         }
 400         return (error);
 401 }
 402
 403 int
 404 ncp_get_volume_info_with_number(struct ncp_conn *conn, int n,
 405                                 struct ncp_volume_info *target,
 406                                 struct thread *td, struct ucred *cred)
 407 {
 408         int error,len;
 409         DECLARE_RQ;
 410
 411         NCP_RQ_HEAD_S(22,44,td,cred);
 412         ncp_rq_byte(rqp,n);
 413         checkbad(ncp_request(conn,rqp));
 414         target->total_blocks = ncp_rp_dword_lh(rqp);
 415         target->free_blocks = ncp_rp_dword_lh(rqp);
 416         target->purgeable_blocks = ncp_rp_dword_lh(rqp);
 417         target->not_yet_purgeable_blocks = ncp_rp_dword_lh(rqp);
 418         target->total_dir_entries = ncp_rp_dword_lh(rqp);
 419         target->available_dir_entries = ncp_rp_dword_lh(rqp);
 420         ncp_rp_dword_lh(rqp);
 421         target->sectors_per_block = ncp_rp_byte(rqp);
 422         bzero(&target->volume_name, sizeof(target->volume_name));
 423         len = ncp_rp_byte(rqp);
 424         if (len > NCP_VOLNAME_LEN) {
 425                 error = ENAMETOOLONG;
 426         } else {
 427                 ncp_rp_mem(rqp,(caddr_t)&target->volume_name, len);
 428         }
 429         NCP_RQ_EXIT;
 430         return error;
 431 }
 432
 433 int
 434 ncp_get_namespaces(struct ncp_conn *conn, u_int32_t volume, int *nsf,
 435                    struct thread *td, struct ucred *cred)
 436 {
 437         int error;
 438         u_int8_t ns;
 439         u_int16_t nscnt;
 440         DECLARE_RQ;
 441
 442         NCP_RQ_HEAD(87,td,cred);
 443         ncp_rq_byte(rqp, 24);   /* Subfunction: Get Loaded Name Spaces */
 444         ncp_rq_word(rqp, 0);
 445         ncp_rq_byte(rqp, volume);
 446         checkbad(ncp_request(conn,rqp));
 447         nscnt = ncp_rp_word_lh(rqp);
 448         *nsf = 0;
 449         while (nscnt-- > 0) {
 450                 ns = ncp_rp_byte(rqp);
 451                 *nsf |= 1 << ns;
 452         }
 453         NCP_RQ_EXIT;
 454         return error;
 455 }
 456
 457 int
 458 ncp_lookup_volume(struct ncp_conn *conn, char *volname,
 459                   u_char *volNum, u_int32_t *dirEnt,
 460                   struct thread *td, struct ucred *cred)
 461 {
 462         int error;
 463         DECLARE_RQ;
 464
 465         NCPNDEBUG("looking up vol %s\n", volname);
 466         NCP_RQ_HEAD(87,td,cred);
 467         ncp_rq_byte(rqp, 22);   /* Subfunction: Generate dir handle */
 468         ncp_rq_byte(rqp, 0);    /* src name space */
 469         ncp_rq_byte(rqp, 0);    /* dst name space, always zero */
 470         ncp_rq_word(rqp, 0);    /* dstNSIndicator */
 471
 472         ncp_rq_byte(rqp, 0);    /* faked volume number */
 473         ncp_rq_dword(rqp, 0);   /* faked dir_base */
 474         ncp_rq_byte(rqp, 0xff); /* Don't have a dir_base */
 475         ncp_rq_byte(rqp, 1);    /* 1 path component */
 476         ncp_rq_pstring(rqp, volname);
 477         checkbad(ncp_request(conn,rqp));
 478         ncp_rp_dword_lh(rqp);   /* NSDirectoryBase*/
 479         *dirEnt = ncp_rp_dword_lh(rqp);
 480         *volNum = ncp_rp_byte(rqp);
 481         NCP_RQ_EXIT;
 482         return error;
 483 }
 484
 485 /*
 486  * Time & date conversion routines taken from msdosfs. Although leap
 487  * year calculation is bogus, it's sufficient before 2100 :)
 488  */
 489 /*
 490  * This is the format of the contents of the deTime field in the direntry
 491  * structure.
 492  * We don't use bitfields because we don't know how compilers for
 493  * arbitrary machines will lay them out.
 494  */
 495 #define DT_2SECONDS_MASK        0x1F    /* seconds divided by 2 */
 496 #define DT_2SECONDS_SHIFT       0
 497 #define DT_MINUTES_MASK         0x7E0   /* minutes */
 498 #define DT_MINUTES_SHIFT        5
 499 #define DT_HOURS_MASK           0xF800  /* hours */
 500 #define DT_HOURS_SHIFT          11
 501
 502 /*
 503  * This is the format of the contents of the deDate field in the direntry
 504  * structure.
 505  */
 506 #define DD_DAY_MASK             0x1F    /* day of month */
 507 #define DD_DAY_SHIFT            0
 508 #define DD_MONTH_MASK           0x1E0   /* month */
 509 #define DD_MONTH_SHIFT          5
 510 #define DD_YEAR_MASK            0xFE00  /* year - 1980 */
 511 #define DD_YEAR_SHIFT           9
 512 /*
 513  * Total number of days that have passed for each month in a regular year.
 514  */
 515 static u_short regyear[] = {
 516         31, 59, 90, 120, 151, 181,
 517         212, 243, 273, 304, 334, 365
 518 };
 519
 520 /*
 521  * Total number of days that have passed for each month in a leap year.
 522  */
 523 static u_short leapyear[] = {
 524         31, 60, 91, 121, 152, 182,
 525         213, 244, 274, 305, 335, 366
 526 };
 527
 528 /*
 529  * Variables used to remember parts of the last time conversion.  Maybe we
 530  * can avoid a full conversion.
 531  */
 532 static u_long  lasttime;
 533 static u_long  lastday;
 534 static u_short lastddate;
 535 static u_short lastdtime;
 536 /*
 537  * Convert the unix version of time to dos's idea of time to be used in
 538  * file timestamps. The passed in unix time is assumed to be in GMT.
 539  */
 540 void
 541 ncp_unix2dostime(struct timespec *tsp, int tzoff, u_int16_t *ddp,
 542                  u_int16_t *dtp, u_int8_t *dhp)
 543 {
 544         u_long t;
 545         u_long days;
 546         u_long inc;
 547         u_long year;
 548         u_long month;
 549         u_short *months;
 550
 551         /*
 552          * If the time from the last conversion is the same as now, then
 553          * skip the computations and use the saved result.
 554          */
 555         t = tsp->tv_sec - tzoff * 60 - tz.tz_minuteswest * 60 -
 556             (wall_cmos_clock ? adjkerntz : 0);
 557         t &= ~1;
 558         if (lasttime != t) {
 559                 lasttime = t;
 560                 lastdtime = (((t / 2) % 30) << DT_2SECONDS_SHIFT)
 561                     + (((t / 60) % 60) << DT_MINUTES_SHIFT)
 562                     + (((t / 3600) % 24) << DT_HOURS_SHIFT);
 563
 564                 /*
 565                  * If the number of days since 1970 is the same as the last
 566                  * time we did the computation then skip all this leap year
 567                  * and month stuff.
 568                  */
 569                 days = t / (24 * 60 * 60);
 570                 if (days != lastday) {
 571                         lastday = days;
 572                         for (year = 1970;; year++) {
 573                                 inc = year & 0x03 ? 365 : 366;
 574                                 if (days < inc)
 575                                         break;
 576                                 days -= inc;
 577                         }
 578                         months = year & 0x03 ? regyear : leapyear;
 579                         for (month = 0; days >= months[month]; month++)
 580                                 ;
 581                         if (month > 0)
 582                                 days -= months[month - 1];
 583                         lastddate = ((days + 1) << DD_DAY_SHIFT)
 584                             + ((month + 1) << DD_MONTH_SHIFT);
 585                         /*
 586                          * Remember dos's idea of time is relative to 1980.
 587                          * unix's is relative to 1970.  If somehow we get a
 588                          * time before 1980 then don't give totally crazy
 589                          * results.
 590                          */
 591                         if (year > 1980)
 592                                 lastddate += (year - 1980) << DD_YEAR_SHIFT;
 593                 }
 594         }
 595         if (dtp)
 596                 *dtp = lastdtime;
 597         if (dhp)
 598                 *dhp = (tsp->tv_sec & 1) * 100 + tsp->tv_nsec / 10000000;
 599
 600         *ddp = lastddate;
 601 }
 602
 603 /*
 604  * The number of seconds between Jan 1, 1970 and Jan 1, 1980. In that
 605  * interval there were 8 regular years and 2 leap years.
 606  */
 607 #define SECONDSTO1980   (((8 * 365) + (2 * 366)) * (24 * 60 * 60))
 608
 609 static u_short lastdosdate;
 610 static u_long  lastseconds;
 611
 612 /*
 613  * Convert from dos' idea of time to unix'. This will probably only be
 614  * called from the stat(), and fstat() system calls and so probably need
 615  * not be too efficient.
 616  */
 617 void
 618 ncp_dos2unixtime(u_int dd, u_int dt, u_int dh, int tzoff, struct timespec *tsp)
 619 {
 620         u_long seconds;
 621         u_long month;
 622         u_long year;
 623         u_long days;
 624         u_short *months;
 625
 626         if (dd == 0) {
 627                 /*
 628                  * Uninitialized field, return the epoch.
 629                  */
 630                 tsp->tv_sec = 0;
 631                 tsp->tv_nsec = 0;
 632                 return;
 633         }
 634         seconds = (((dt & DT_2SECONDS_MASK) >> DT_2SECONDS_SHIFT) << 1)
 635             + ((dt & DT_MINUTES_MASK) >> DT_MINUTES_SHIFT) * 60
 636             + ((dt & DT_HOURS_MASK) >> DT_HOURS_SHIFT) * 3600
 637             + dh / 100;
 638         /*
 639          * If the year, month, and day from the last conversion are the
 640          * same then use the saved value.
 641          */
 642         if (lastdosdate != dd) {
 643                 lastdosdate = dd;
 644                 days = 0;
 645                 year = (dd & DD_YEAR_MASK) >> DD_YEAR_SHIFT;
 646                 days = year * 365;
 647                 days += year / 4 + 1;   /* add in leap days */
 648                 if ((year & 0x03) == 0)
 649                         days--;         /* if year is a leap year */
 650                 months = year & 0x03 ? regyear : leapyear;
 651                 month = (dd & DD_MONTH_MASK) >> DD_MONTH_SHIFT;
 652                 if (month < 1 || month > 12) {
 653                         month = 1;
 654                 }
 655                 if (month > 1)
 656                         days += months[month - 2];
 657                 days += ((dd & DD_DAY_MASK) >> DD_DAY_SHIFT) - 1;
 658                 lastseconds = (days * 24 * 60 * 60) + SECONDSTO1980;
 659         }
 660         tsp->tv_sec = seconds + lastseconds + tz.tz_minuteswest * 60 +
 661             tzoff * 60 + (wall_cmos_clock ? adjkerntz : 0);
 662         tsp->tv_nsec = (dh % 100) * 10000000;
 663 }