sys/fs/smbfs/smbfs_subr.c

   1 /*      $NetBSD: smbfs_subr.c,v 1.13 2006/11/16 01:33:37 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) 2000-2001, Boris Popov
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *    This product includes software developed by Boris Popov.
  18  * 4. Neither the name of the author nor the names of any co-contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * FreeBSD: src/sys/fs/smbfs/smbfs_subr.c,v 1.1 2001/04/10 07:59:05 bp Exp
  35  */
  36
  37 #include <sys/cdefs.h>
  38 __KERNEL_RCSID(0, "$NetBSD: smbfs_subr.c,v 1.13 2006/11/16 01:33:37 christos Exp $");
  39
  40 #include <sys/param.h>
  41 #include <sys/systm.h>
  42 #include <sys/kernel.h>
  43 #include <sys/malloc.h>
  44 #include <sys/mount.h>
  45 #include <sys/time.h>
  46 #include <sys/vnode.h>
  47 #include <sys/sysctl.h>
  48 #include <netsmb/iconv.h>
  49
  50 #include <netsmb/smb.h>
  51 #include <netsmb/smb_conn.h>
  52 #include <netsmb/smb_subr.h>
  53 #include <netsmb/smb_rq.h>
  54 #include <netsmb/smb_dev.h>
  55
  56 #include <fs/smbfs/smbfs.h>
  57 #include <fs/smbfs/smbfs_node.h>
  58 #include <fs/smbfs/smbfs_subr.h>
  59
  60 MALLOC_JUSTDEFINE(M_SMBFSDATA, "SMBFS data", "SMBFS private data");
  61
  62 /*
  63  * Time & date conversion routines taken from msdosfs. Although leap
  64  * year calculation is bogus, it's sufficient before 2100 :)
  65  */
  66 /*
  67  * This is the format of the contents of the deTime field in the direntry
  68  * structure.
  69  * We don't use bitfields because we don't know how compilers for
  70  * arbitrary machines will lay them out.
  71  */
  72 #define DT_2SECONDS_MASK        0x1F    /* seconds divided by 2 */
  73 #define DT_2SECONDS_SHIFT       0
  74 #define DT_MINUTES_MASK         0x7E0   /* minutes */
  75 #define DT_MINUTES_SHIFT        5
  76 #define DT_HOURS_MASK           0xF800  /* hours */
  77 #define DT_HOURS_SHIFT          11
  78
  79 /*
  80  * This is the format of the contents of the deDate field in the direntry
  81  * structure.
  82  */
  83 #define DD_DAY_MASK             0x1F    /* day of month */
  84 #define DD_DAY_SHIFT            0
  85 #define DD_MONTH_MASK           0x1E0   /* month */
  86 #define DD_MONTH_SHIFT          5
  87 #define DD_YEAR_MASK            0xFE00  /* year - 1980 */
  88 #define DD_YEAR_SHIFT           9
  89 /*
  90  * Total number of days that have passed for each month in a regular year.
  91  */
  92 static const u_short regyear[] = {
  93         31, 59, 90, 120, 151, 181,
  94         212, 243, 273, 304, 334, 365
  95 };
  96
  97 /*
  98  * Total number of days that have passed for each month in a leap year.
  99  */
 100 static const u_short leapyear[] = {
 101         31, 60, 91, 121, 152, 182,
 102         213, 244, 274, 305, 335, 366
 103 };
 104
 105 /*
 106  * Variables used to remember parts of the last time conversion.  Maybe we
 107  * can avoid a full conversion.
 108  */
 109 static u_long  lasttime;
 110 static u_long  lastday;
 111 static u_short lastddate;
 112 static u_short lastdtime;
 113
 114 void
 115 smb_time_local2server(struct timespec *tsp, int tzoff, u_long *seconds)
 116 {
 117         *seconds = tsp->tv_sec - tzoff * 60 /*- tz.tz_minuteswest * 60 -
 118             (wall_cmos_clock ? adjkerntz : 0)*/;
 119 }
 120
 121 void
 122 smb_time_server2local(u_long seconds, int tzoff, struct timespec *tsp)
 123 {
 124         tsp->tv_sec = seconds + tzoff * 60;
 125             /*+ tz.tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0)*/;
 126 }
 127
 128 /*
 129  * Number of seconds between 1970 and 1601 year
 130  */
 131 static const int64_t DIFF1970TO1601 = 11644473600ULL;
 132
 133 /*
 134  * Time from server comes as UTC, so no need to use tz
 135  */
 136 void
 137 smb_time_NT2local(int64_t nsec, int tzoff, struct timespec *tsp)
 138 {
 139         smb_time_server2local(nsec / 10000000 - DIFF1970TO1601, 0, tsp);
 140 }
 141
 142 void
 143 smb_time_local2NT(struct timespec *tsp, int tzoff, int64_t *nsec)
 144 {
 145         u_long seconds;
 146
 147         smb_time_local2server(tsp, 0, &seconds);
 148         *nsec = (((int64_t)(seconds) & ~1) + DIFF1970TO1601) * (int64_t)10000000;
 149 }
 150
 151 void
 152 smb_time_unix2dos(struct timespec *tsp, int tzoff, u_int16_t *ddp,
 153         u_int16_t *dtp, u_int8_t *dhp)
 154 {
 155         u_long t, days, year, month, inc;
 156         const u_short *months;
 157
 158         /*
 159          * If the time from the last conversion is the same as now, then
 160          * skip the computations and use the saved result.
 161          */
 162         smb_time_local2server(tsp, tzoff, &t);
 163         t &= ~1;
 164         if (lasttime != t) {
 165                 lasttime = t;
 166                 lastdtime = (((t / 2) % 30) << DT_2SECONDS_SHIFT)
 167                     + (((t / 60) % 60) << DT_MINUTES_SHIFT)
 168                     + (((t / 3600) % 24) << DT_HOURS_SHIFT);
 169
 170                 /*
 171                  * If the number of days since 1970 is the same as the last
 172                  * time we did the computation then skip all this leap year
 173                  * and month stuff.
 174                  */
 175                 days = t / (24 * 60 * 60);
 176                 if (days != lastday) {
 177                         lastday = days;
 178                         for (year = 1970;; year++) {
 179                                 inc = year & 0x03 ? 365 : 366;
 180                                 if (days < inc)
 181                                         break;
 182                                 days -= inc;
 183                         }
 184                         months = year & 0x03 ? regyear : leapyear;
 185                         for (month = 0; days >= months[month]; month++)
 186                                 ;
 187                         if (month > 0)
 188                                 days -= months[month - 1];
 189                         lastddate = ((days + 1) << DD_DAY_SHIFT)
 190                             + ((month + 1) << DD_MONTH_SHIFT);
 191                         /*
 192                          * Remember dos's idea of time is relative to 1980.
 193                          * unix's is relative to 1970.  If somehow we get a
 194                          * time before 1980 then don't give totally crazy
 195                          * results.
 196                          */
 197                         if (year > 1980)
 198                                 lastddate += (year - 1980) << DD_YEAR_SHIFT;
 199                 }
 200         }
 201         if (dtp)
 202                 *dtp = lastdtime;
 203         if (dhp)
 204                 *dhp = (tsp->tv_sec & 1) * 100 + tsp->tv_nsec / 10000000;
 205
 206         *ddp = lastddate;
 207 }
 208
 209 /*
 210  * The number of seconds between Jan 1, 1970 and Jan 1, 1980. In that
 211  * interval there were 8 regular years and 2 leap years.
 212  */
 213 #define SECONDSTO1980   (((8 * 365) + (2 * 366)) * (24 * 60 * 60))
 214
 215 static u_short lastdosdate;
 216 static u_long  lastseconds;
 217
 218 void
 219 smb_dos2unixtime(u_int dd, u_int dt, u_int dh, int tzoff,
 220         struct timespec *tsp)
 221 {
 222         u_long seconds;
 223         u_long month;
 224         u_long year;
 225         u_long days;
 226         const u_short *months;
 227
 228         if (dd == 0) {
 229                 tsp->tv_sec = 0;
 230                 tsp->tv_nsec = 0;
 231                 return;
 232         }
 233         seconds = (((dt & DT_2SECONDS_MASK) >> DT_2SECONDS_SHIFT) << 1)
 234             + ((dt & DT_MINUTES_MASK) >> DT_MINUTES_SHIFT) * 60
 235             + ((dt & DT_HOURS_MASK) >> DT_HOURS_SHIFT) * 3600
 236             + dh / 100;
 237         /*
 238          * If the year, month, and day from the last conversion are the
 239          * same then use the saved value.
 240          */
 241         if (lastdosdate != dd) {
 242                 lastdosdate = dd;
 243                 days = 0;
 244                 year = (dd & DD_YEAR_MASK) >> DD_YEAR_SHIFT;
 245                 days = year * 365;
 246                 days += year / 4 + 1;   /* add in leap days */
 247                 if ((year & 0x03) == 0)
 248                         days--;         /* if year is a leap year */
 249                 months = year & 0x03 ? regyear : leapyear;
 250                 month = (dd & DD_MONTH_MASK) >> DD_MONTH_SHIFT;
 251                 if (month < 1 || month > 12) {
 252                         month = 1;
 253                 }
 254                 if (month > 1)
 255                         days += months[month - 2];
 256                 days += ((dd & DD_DAY_MASK) >> DD_DAY_SHIFT) - 1;
 257                 lastseconds = (days * 24 * 60 * 60) + SECONDSTO1980;
 258         }
 259         smb_time_server2local(seconds + lastseconds, tzoff, tsp);
 260         tsp->tv_nsec = (dh % 100) * 10000000;
 261 }
 262
 263 static int
 264 smb_fphelp(struct mbchain *mbp, struct smb_vc *vcp, struct smbnode *np,
 265         int caseopt)
 266 {
 267         struct smbmount *smp= np->n_mount;
 268         struct smbnode **npp = smp->sm_npstack;
 269         int i, error = 0;
 270
 271 /*      simple_lock(&smp->sm_npslock);*/
 272         i = 0;
 273         while (np->n_parent) {
 274                 if (i++ == SMBFS_MAXPATHCOMP) {
 275 /*                      simple_unlock(&smp->sm_npslock);*/
 276                         return ENAMETOOLONG;
 277                 }
 278                 *npp++ = np;
 279                 np = VTOSMB(np->n_parent);
 280         }
 281         while (i--) {
 282                 np = *--npp;
 283                 error = mb_put_uint8(mbp, '\\');
 284                 if (error)
 285                         break;
 286                 error = smb_put_dmem(mbp, vcp, np->n_name, np->n_nmlen, caseopt);
 287                 if (error)
 288                         break;
 289         }
 290 /*      simple_unlock(&smp->sm_npslock);*/
 291         return error;
 292 }
 293
 294 int
 295 smbfs_fullpath(struct mbchain *mbp, struct smb_vc *vcp, struct smbnode *dnp,
 296         const char *name, int nmlen)
 297 {
 298         int caseopt = SMB_CS_NONE;
 299         int error;
 300
 301         if (SMB_DIALECT(vcp) < SMB_DIALECT_LANMAN1_0)
 302                 caseopt |= SMB_CS_UPPER;
 303         if (dnp != NULL) {
 304                 error = smb_fphelp(mbp, vcp, dnp, caseopt);
 305                 if (error)
 306                         return error;
 307         }
 308         if (name) {
 309                 error = mb_put_uint8(mbp, '\\');
 310                 if (error)
 311                         return error;
 312                 error = smb_put_dmem(mbp, vcp, name, nmlen, caseopt);
 313                 if (error)
 314                         return error;
 315         }
 316         error = mb_put_uint8(mbp, 0);
 317         return error;
 318 }
 319
 320 int
 321 smbfs_fname_tolocal(struct smb_vc *vcp, char *name, int nmlen,
 322     int caseopt)
 323 {
 324 /*      if (caseopt & SMB_CS_UPPER)
 325                 iconv_convmem(vcp->vc_toupper, name, name, nmlen);
 326         else if (caseopt & SMB_CS_LOWER)
 327                 iconv_convmem(vcp->vc_tolower, name, name, nmlen);*/
 328         if (vcp->vc_tolocal)
 329                 iconv_convmem(vcp->vc_tolocal, name, name, nmlen);
 330         return 0;
 331 }