source/lib/util_file.c

   1 /*
   2  * Unix SMB/Netbios implementation. Version 1.9. SMB parameters and setup
   3  * Copyright (C) Andrew Tridgell 1992-1998 Modified by Jeremy Allison 1995.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it under
   6  * the terms of the GNU General Public License as published by the Free
   7  * Software Foundation; either version 2 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc., 675
  17  * Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #include "includes.h"
  21
  22 static int gotalarm;
  23
  24 /***************************************************************
  25  Signal function to tell us we timed out.
  26 ****************************************************************/
  27
  28 static void gotalarm_sig(void)
  29 {
  30   gotalarm = 1;
  31 }
  32
  33 /***************************************************************
  34  Lock or unlock a fd for a known lock type. Abandon after waitsecs
  35  seconds.
  36 ****************************************************************/
  37
  38 BOOL do_file_lock(int fd, int waitsecs, int type)
  39 {
  40   SMB_STRUCT_FLOCK lock;
  41   int             ret;
  42
  43   gotalarm = 0;
  44   CatchSignal(SIGALRM, SIGNAL_CAST gotalarm_sig);
  45
  46   lock.l_type = type;
  47   lock.l_whence = SEEK_SET;
  48   lock.l_start = 0;
  49   lock.l_len = 1;
  50   lock.l_pid = 0;
  51
  52   alarm(waitsecs);
  53   ret = fcntl(fd, SMB_F_SETLKW, &lock);
  54   alarm(0);
  55   CatchSignal(SIGALRM, SIGNAL_CAST SIG_DFL);
  56
  57   if (gotalarm) {
  58     DEBUG(0, ("do_file_lock: failed to %s file.\n",
  59                 type == F_UNLCK ? "unlock" : "lock"));
  60     return False;
  61   }
  62
  63   return (ret == 0);
  64 }
  65
  66
  67 /***************************************************************
  68  Lock an fd. Abandon after waitsecs seconds.
  69 ****************************************************************/
  70
  71 BOOL file_lock(int fd, int type, int secs, int *plock_depth)
  72 {
  73   if (fd < 0)
  74     return False;
  75
  76   (*plock_depth)++;
  77
  78   if ((*plock_depth) == 0)
  79   {
  80     if (!do_file_lock(fd, secs, type)) {
  81       DEBUG(10,("file_lock: locking file failed, error = %s.\n",
  82                  strerror(errno)));
  83       return False;
  84     }
  85   }
  86
  87   return True;
  88 }
  89
  90 /***************************************************************
  91  Unlock an fd. Abandon after waitsecs seconds.
  92 ****************************************************************/
  93
  94 BOOL file_unlock(int fd, int *plock_depth)
  95 {
  96   BOOL ret=True;
  97
  98   if(*plock_depth == 1)
  99     ret = do_file_lock(fd, 5, F_UNLCK);
 100
 101   (*plock_depth)--;
 102
 103   if(!ret)
 104     DEBUG(10,("file_unlock: unlocking file failed, error = %s.\n",
 105                  strerror(errno)));
 106   return ret;
 107 }
 108
 109 /***************************************************************
 110  locks a file for enumeration / modification.
 111  update to be set = True if modification is required.
 112 ****************************************************************/
 113
 114 void *startfilepwent(char *pfile, char *s_readbuf, int bufsize,
 115                                 int *file_lock_depth, BOOL update)
 116 {
 117   FILE *fp = NULL;
 118
 119   if (!*pfile)
 120  {
 121     DEBUG(0, ("startfilepwent: No file set\n"));
 122     return (NULL);
 123   }
 124   DEBUG(10, ("startfilepwent: opening file %s\n", pfile));
 125
 126   fp = sys_fopen(pfile, update ? "r+b" : "rb");
 127
 128   if (fp == NULL) {
 129     DEBUG(0, ("startfilepwent: unable to open file %s\n", pfile));
 130     return NULL;
 131   }
 132
 133   /* Set a buffer to do more efficient reads */
 134   setvbuf(fp, s_readbuf, _IOFBF, bufsize);
 135
 136   if (!file_lock(fileno(fp), (update ? F_WRLCK : F_RDLCK), 5, file_lock_depth))
 137   {
 138     DEBUG(0, ("startfilepwent: unable to lock file %s\n", pfile));
 139     fclose(fp);
 140     return NULL;
 141   }
 142
 143   /* Make sure it is only rw by the owner */
 144   chmod(pfile, 0600);
 145
 146   /* We have a lock on the file. */
 147   return (void *)fp;
 148 }
 149
 150 /***************************************************************
 151  End enumeration of the file.
 152 ****************************************************************/
 153 void endfilepwent(void *vp, int *file_lock_depth)
 154 {
 155   FILE *fp = (FILE *)vp;
 156
 157   file_unlock(fileno(fp), file_lock_depth);
 158   fclose(fp);
 159   DEBUG(7, ("endfilepwent: closed file.\n"));
 160 }
 161
 162 /*************************************************************************
 163  Return the current position in the file list as an SMB_BIG_UINT.
 164  This must be treated as an opaque token.
 165 *************************************************************************/
 166 SMB_BIG_UINT getfilepwpos(void *vp)
 167 {
 168   return (SMB_BIG_UINT)sys_ftell((FILE *)vp);
 169 }
 170
 171 /*************************************************************************
 172  Set the current position in the file list from an SMB_BIG_UINT.
 173  This must be treated as an opaque token.
 174 *************************************************************************/
 175 BOOL setfilepwpos(void *vp, SMB_BIG_UINT tok)
 176 {
 177   return !sys_fseek((FILE *)vp, (SMB_OFF_T)tok, SEEK_SET);
 178 }
 179
 180 /*************************************************************************
 181  gets a line out of a file.
 182  line is of format "xxxx:xxxxxx:xxxxx:".
 183  lines with "#" at the front are ignored.
 184 *************************************************************************/
 185 int getfileline(void *vp, char *linebuf, int linebuf_size)
 186 {
 187         /* Static buffers we will return. */
 188         FILE *fp = (FILE *)vp;
 189         unsigned char   c;
 190         unsigned char  *p;
 191         size_t            linebuf_len;
 192
 193         if (fp == NULL)
 194         {
 195                 DEBUG(0,("getfileline: Bad file pointer.\n"));
 196                 return -1;
 197         }
 198
 199         /*
 200          * Scan the file, a line at a time.
 201          */
 202         while (!feof(fp))
 203         {
 204                 linebuf[0] = '\0';
 205
 206                 fgets(linebuf, linebuf_size, fp);
 207                 if (ferror(fp))
 208                 {
 209                         return -1;
 210                 }
 211
 212                 /*
 213                  * Check if the string is terminated with a newline - if not
 214                  * then we must keep reading and discard until we get one.
 215                  */
 216
 217                 linebuf_len = strlen(linebuf);
 218                 if (linebuf_len == 0)
 219                 {
 220                         linebuf[0] = '\0';
 221                         return 0;
 222                 }
 223
 224                 if (linebuf[linebuf_len - 1] != '\n')
 225                 {
 226                         c = '\0';
 227                         while (!ferror(fp) && !feof(fp))
 228                         {
 229                                 c = fgetc(fp);
 230                                 if (c == '\n')
 231                                 {
 232                                         break;
 233                                 }
 234                         }
 235                 }
 236                 else
 237                 {
 238                         linebuf[linebuf_len - 1] = '\0';
 239                 }
 240
 241 #ifdef DEBUG_PASSWORD
 242                 DEBUG(100, ("getfileline: got line |%s|\n", linebuf));
 243 #endif
 244                 if ((linebuf[0] == 0) && feof(fp))
 245                 {
 246                         DEBUG(4, ("getfileline: end of file reached\n"));
 247                         return 0;
 248                 }
 249
 250                 if (linebuf[0] == '#' || linebuf[0] == '\0')
 251                 {
 252                         DEBUG(6, ("getfileline: skipping comment or blank line\n"));
 253                         continue;
 254                 }
 255
 256                 p = (unsigned char *) strchr(linebuf, ':');
 257                 if (p == NULL)
 258                 {
 259                         DEBUG(0, ("getfileline: malformed line entry (no :)\n"));
 260                         continue;
 261                 }
 262                 return linebuf_len;
 263         }
 264         return -1;
 265 }
 266
 267
 268 /****************************************************************************
 269 read a line from a file with possible \ continuation chars.
 270 Blanks at the start or end of a line are stripped.
 271 The string will be allocated if s2 is NULL
 272 ****************************************************************************/
 273 char *fgets_slash(char *s2,int maxlen,FILE *f)
 274 {
 275   char *s=s2;
 276   int len = 0;
 277   int c;
 278   BOOL start_of_line = True;
 279
 280   if (feof(f))
 281     return(NULL);
 282
 283   if (maxlen <2) return(NULL);
 284
 285   if (!s2)
 286     {
 287       char *t;
 288
 289       maxlen = MIN(maxlen,8);
 290       t = (char *)Realloc(s,maxlen);
 291       if (!t) {
 292         DEBUG(0,("fgets_slash: failed to expand buffer!\n"));
 293         SAFE_FREE(s);
 294         return(NULL);
 295       } else
 296         s = t;
 297     }
 298
 299   if (!s)
 300     return(NULL);
 301
 302   *s = 0;
 303
 304   while (len < maxlen-1)
 305     {
 306       c = getc(f);
 307       switch (c)
 308         {
 309         case '\r':
 310           break;
 311         case '\n':
 312           while (len > 0 && s[len-1] == ' ')
 313             {
 314               s[--len] = 0;
 315             }
 316           if (len > 0 && s[len-1] == '\\')
 317             {
 318               s[--len] = 0;
 319               start_of_line = True;
 320               break;
 321             }
 322           return(s);
 323         case EOF:
 324           if (len <= 0 && !s2)
 325             SAFE_FREE(s);
 326           return(len>0?s:NULL);
 327         case ' ':
 328           if (start_of_line)
 329             break;
 330         default:
 331           start_of_line = False;
 332           s[len++] = c;
 333           s[len] = 0;
 334         }
 335       if (!s2 && len > maxlen-3) {
 336         char *t;
 337
 338         maxlen *= 2;
 339         t = (char *)Realloc(s,maxlen);
 340         if (!t) {
 341           DEBUG(0,("fgets_slash: failed to expand buffer!\n"));
 342           SAFE_FREE(s);
 343           return(NULL);
 344         } else
 345           s = t;
 346       }
 347     }
 348   return(s);
 349 }
 350
 351
 352 /****************************************************************************
 353 load from a pipe into memory
 354 ****************************************************************************/
 355 char *file_pload(char *syscmd, size_t *size)
 356 {
 357         int fd, n;
 358         char *p, *tp;
 359         pstring buf;
 360         size_t total;
 361
 362         fd = sys_popen(syscmd);
 363         if (fd == -1) return NULL;
 364
 365         p = NULL;
 366         total = 0;
 367
 368         while ((n = read(fd, buf, sizeof(buf))) > 0) {
 369                 tp = Realloc(p, total + n + 1);
 370                 if (!tp) {
 371                         DEBUG(0,("file_pload: failed to exand buffer!\n"));
 372                         close(fd);
 373                         SAFE_FREE(p);
 374                         return NULL;
 375                 } else
 376                         p = tp;
 377                 memcpy(p+total, buf, n);
 378                 total += n;
 379         }
 380         if (p) p[total] = 0;
 381
 382         sys_pclose(fd);
 383
 384         if (size) *size = total;
 385
 386         return p;
 387 }
 388
 389 /****************************************************************************
 390 load a file into memory from a fd.
 391 ****************************************************************************/
 392
 393 char *fd_load(int fd, size_t *size)
 394 {
 395         SMB_STRUCT_STAT sbuf;
 396         char *p;
 397
 398         if (sys_fstat(fd, &sbuf) != 0) return NULL;
 399
 400         p = (char *)malloc(sbuf.st_size+1);
 401         if (!p) return NULL;
 402
 403         if (read(fd, p, sbuf.st_size) != sbuf.st_size) {
 404                 SAFE_FREE(p);
 405                 return NULL;
 406         }
 407         p[sbuf.st_size] = 0;
 408
 409         if (size) *size = sbuf.st_size;
 410
 411         return p;
 412 }
 413
 414 /****************************************************************************
 415 load a file into memory
 416 ****************************************************************************/
 417 char *file_load(char *fname, size_t *size)
 418 {
 419         int fd;
 420         char *p;
 421
 422         if (!fname || !*fname) return NULL;
 423
 424         fd = open(fname,O_RDONLY);
 425         if (fd == -1) return NULL;
 426
 427         p = fd_load(fd, size);
 428
 429         close(fd);
 430
 431         return p;
 432 }
 433
 434
 435 /****************************************************************************
 436 parse a buffer into lines
 437 ****************************************************************************/
 438 static char **file_lines_parse(char *p, size_t size, int *numlines, BOOL convert)
 439 {
 440         int i;
 441         char *s, **ret;
 442
 443         if (!p) return NULL;
 444
 445         for (s = p, i=0; s < p+size; s++) {
 446                 if (s[0] == '\n') i++;
 447         }
 448
 449         ret = (char **)malloc(sizeof(ret[0])*(i+2));
 450         if (!ret) {
 451                 SAFE_FREE(p);
 452                 return NULL;
 453         }
 454         memset(ret, 0, sizeof(ret[0])*(i+2));
 455         if (numlines) *numlines = i;
 456
 457         ret[0] = p;
 458         for (s = p, i=0; s < p+size; s++) {
 459                 if (s[0] == '\n') {
 460                         s[0] = 0;
 461                         i++;
 462                         ret[i] = s+1;
 463                 }
 464                 if (s[0] == '\r') s[0] = 0;
 465         }
 466
 467         if (convert) {
 468                 for (i = 0; ret[i]; i++)
 469                         unix_to_dos(ret[i], True);
 470         }
 471
 472         return ret;
 473 }
 474
 475
 476 /****************************************************************************
 477 load a file into memory and return an array of pointers to lines in the file
 478 must be freed with file_lines_free(). If convert is true calls unix_to_dos on
 479 the list.
 480 ****************************************************************************/
 481 char **file_lines_load(char *fname, int *numlines, BOOL convert)
 482 {
 483         char *p;
 484         size_t size;
 485
 486         p = file_load(fname, &size);
 487         if (!p) return NULL;
 488
 489         return file_lines_parse(p, size, numlines, convert);
 490 }
 491
 492 /****************************************************************************
 493 load a fd into memory and return an array of pointers to lines in the file
 494 must be freed with file_lines_free(). If convert is true calls unix_to_dos on
 495 the list.
 496 ****************************************************************************/
 497 char **fd_lines_load(int fd, int *numlines, BOOL convert)
 498 {
 499         char *p;
 500         size_t size;
 501
 502         p = fd_load(fd, &size);
 503         if (!p) return NULL;
 504
 505         return file_lines_parse(p, size, numlines, convert);
 506 }
 507
 508
 509 /****************************************************************************
 510 load a pipe into memory and return an array of pointers to lines in the data
 511 must be freed with file_lines_free(). If convert is true calls unix_to_dos on
 512 the list.
 513 ****************************************************************************/
 514 char **file_lines_pload(char *syscmd, int *numlines, BOOL convert)
 515 {
 516         char *p;
 517         size_t size;
 518
 519         p = file_pload(syscmd, &size);
 520         if (!p) return NULL;
 521
 522         return file_lines_parse(p, size, numlines, convert);
 523 }
 524
 525 /****************************************************************************
 526 free lines loaded with file_lines_load
 527 ****************************************************************************/
 528 void file_lines_free(char **lines)
 529 {
 530         if (!lines) return;
 531         SAFE_FREE(lines[0]);
 532         SAFE_FREE(lines);
 533 }
 534
 535
 536 /****************************************************************************
 537 take a lislist of lines and modify them to produce a list where \ continues
 538 a line
 539 ****************************************************************************/
 540 void file_lines_slashcont(char **lines)
 541 {
 542         int i, j;
 543
 544         for (i=0; lines[i];) {
 545                 int len = strlen(lines[i]);
 546                 if (lines[i][len-1] == '\\') {
 547                         lines[i][len-1] = ' ';
 548                         if (lines[i+1]) {
 549                                 char *p = &lines[i][len];
 550                                 while (p < lines[i+1]) *p++ = ' ';
 551                                 for (j = i+1; lines[j]; j++) lines[j] = lines[j+1];
 552                         }
 553                 } else {
 554                         i++;
 555                 }
 556         }
 557 }