source4/client/cifsdd.c

   1 /*
   2    CIFSDD - dd for SMB.
   3    Main program, argument handling and block copying.
   4
   5    Copyright (C) James Peach 2005-2006
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "system/filesys.h"
  23 #include "auth/gensec/gensec.h"
  24 #include "lib/cmdline/popt_common.h"
  25 #include "libcli/resolve/resolve.h"
  26 #include "libcli/raw/libcliraw.h"
  27 #include "lib/events/events.h"
  28
  29 #include "cifsdd.h"
  30 #include "param/param.h"
  31
  32 const char * const PROGNAME = "cifsdd";
  33
  34 #define SYNTAX_EXIT_CODE         1      /* Invokation syntax or logic error. */
  35 #define EOM_EXIT_CODE            9      /* Out of memory error. */
  36 #define FILESYS_EXIT_CODE       10      /* File manipulation error. */
  37 #define IOERROR_EXIT_CODE       11      /* Error during IO phase. */
  38
  39 struct  dd_stats_record dd_stats;
  40
  41 static int dd_sigint;
  42 static int dd_sigusr1;
  43
  44 static void dd_handle_signal(int sig)
  45 {
  46         switch (sig)
  47         {
  48                 case SIGINT:
  49                         ++dd_sigint;
  50                         break;
  51                 case SIGUSR1:
  52                         ++dd_sigusr1;
  53                         break;
  54                 default:
  55                         break;
  56         }
  57 }
  58
  59 /* ------------------------------------------------------------------------- */
  60 /* Argument handling.                                                        */
  61 /* ------------------------------------------------------------------------- */
  62
  63 static const struct {
  64         enum argtype arg_type;
  65         const char * arg_name;
  66 } names [] = {
  67         { ARG_NUMERIC, "COUNT" },
  68         { ARG_SIZE, "SIZE" },
  69         { ARG_PATHNAME, "FILE" },
  70         { ARG_BOOL, "BOOLEAN" },
  71 };
  72
  73 static const char * argtype_str(enum argtype arg_type)
  74 {
  75         int i;
  76
  77         for (i = 0; i < ARRAY_SIZE(names); ++i) {
  78                 if (arg_type == names[i].arg_type) {
  79                         return(names[i].arg_name);
  80                 }
  81         }
  82
  83         return("<unknown>");
  84 }
  85
  86 static struct argdef args[] =
  87 {
  88         { "bs", ARG_SIZE,       "force ibs and obs to SIZE bytes" },
  89         { "ibs", ARG_SIZE,      "read SIZE bytes at a time" },
  90         { "obs", ARG_SIZE,      "write SIZE bytes at a time" },
  91
  92         { "count", ARG_NUMERIC, "copy COUNT input blocks" },
  93         { "seek",ARG_NUMERIC,   "skip COUNT blocks at start of output" },
  94         { "skip",ARG_NUMERIC,   "skip COUNT blocks at start of input" },
  95
  96         { "if", ARG_PATHNAME,   "read input from FILE" },
  97         { "of", ARG_PATHNAME,   "write output to FILE" },
  98
  99         { "direct", ARG_BOOL,   "use direct I/O if non-zero" },
 100         { "sync", ARG_BOOL,     "use synchronous writes if non-zero" },
 101         { "oplock", ARG_BOOL,   "take oplocks on the input and output files" },
 102
 103 /* FIXME: We should support using iflags and oflags for setting oplock and I/O
 104  * options. This would make us compatible with GNU dd.
 105  */
 106 };
 107
 108 static struct argdef * find_named_arg(const char * arg)
 109 {
 110         int i;
 111
 112         for (i = 0; i < ARRAY_SIZE(args); ++i) {
 113                 if (strwicmp(arg, args[i].arg_name) == 0) {
 114                         return(&args[i]);
 115                 }
 116         }
 117
 118         return(NULL);
 119 }
 120
 121 int set_arg_argv(const char * argv)
 122 {
 123         struct argdef * arg;
 124
 125         char *  name;
 126         char *  val;
 127
 128         if ((name = strdup(argv)) == NULL) {
 129                 return(0);
 130         }
 131
 132         if ((val = strchr(name, '=')) == NULL) {
 133                 fprintf(stderr, "%s: malformed argument \"%s\"\n",
 134                                 PROGNAME, argv);
 135                 goto fail;
 136         }
 137
 138         *val = '\0';
 139         val++;
 140
 141         if ((arg = find_named_arg(name)) == NULL) {
 142                 fprintf(stderr, "%s: ignoring unknown argument \"%s\"\n",
 143                                 PROGNAME, name);
 144                 goto fail;
 145         }
 146
 147         /* Found a matching name; convert the variable argument. */
 148         switch (arg->arg_type) {
 149                 case ARG_NUMERIC:
 150                         if (!conv_str_u64(val, &arg->arg_val.nval)) {
 151                                 goto fail;
 152                         }
 153                         break;
 154                 case ARG_SIZE:
 155                         if (!conv_str_size(val, &arg->arg_val.nval)) {
 156                                 goto fail;
 157                         }
 158                         break;
 159                 case ARG_BOOL:
 160                         if (!conv_str_bool(val, &arg->arg_val.bval)) {
 161                                 goto fail;
 162                         }
 163                         break;
 164                 case ARG_PATHNAME:
 165                         if (!(arg->arg_val.pval = strdup(val))) {
 166                                 goto fail;
 167                         }
 168                         break;
 169                 default:
 170                         fprintf(stderr, "%s: argument \"%s\" is of "
 171                                 "unknown type\n", PROGNAME, name);
 172                         goto fail;
 173         }
 174
 175         free(name);
 176         return(1);
 177
 178 fail:
 179         free(name);
 180         return(0);
 181 }
 182
 183 void set_arg_val(const char * name, ...)
 184 {
 185         va_list         ap;
 186         struct argdef * arg;
 187
 188         va_start(ap, name);
 189         if ((arg = find_named_arg(name)) == NULL) {
 190                 goto fail;
 191         }
 192
 193         /* Found a matching name; convert the variable argument. */
 194         switch (arg->arg_type) {
 195                 case ARG_NUMERIC:
 196                 case ARG_SIZE:
 197                         arg->arg_val.nval = va_arg(ap, uint64_t);
 198                         break;
 199                 case ARG_BOOL:
 200                         arg->arg_val.bval = va_arg(ap, int);
 201                         break;
 202                 case ARG_PATHNAME:
 203                         arg->arg_val.pval = va_arg(ap, char *);
 204                         if (arg->arg_val.pval) {
 205                                 arg->arg_val.pval = strdup(arg->arg_val.pval);
 206                         }
 207                         break;
 208                 default:
 209                         fprintf(stderr, "%s: argument \"%s\" is of "
 210                                 "unknown type\n", PROGNAME, name);
 211                         goto fail;
 212         }
 213
 214         va_end(ap);
 215         return;
 216
 217 fail:
 218         fprintf(stderr, "%s: ignoring unknown argument \"%s\"\n",
 219                         PROGNAME, name);
 220         va_end(ap);
 221         return;
 222 }
 223
 224 bool check_arg_bool(const char * name)
 225 {
 226         struct argdef * arg;
 227
 228         if ((arg = find_named_arg(name)) &&
 229             (arg->arg_type == ARG_BOOL)) {
 230                 return(arg->arg_val.bval);
 231         }
 232
 233         DEBUG(0, ("invalid argument name: %s", name));
 234         SMB_ASSERT(0);
 235         return(false);
 236 }
 237
 238 uint64_t check_arg_numeric(const char * name)
 239 {
 240         struct argdef * arg;
 241
 242         if ((arg = find_named_arg(name)) &&
 243             (arg->arg_type == ARG_NUMERIC || arg->arg_type == ARG_SIZE)) {
 244                 return(arg->arg_val.nval);
 245         }
 246
 247         DEBUG(0, ("invalid argument name: %s", name));
 248         SMB_ASSERT(0);
 249         return(-1);
 250 }
 251
 252 const char * check_arg_pathname(const char * name)
 253 {
 254         struct argdef * arg;
 255
 256         if ((arg = find_named_arg(name)) &&
 257             (arg->arg_type == ARG_PATHNAME)) {
 258                 return(arg->arg_val.pval);
 259         }
 260
 261         DEBUG(0, ("invalid argument name: %s", name));
 262         SMB_ASSERT(0);
 263         return(NULL);
 264 }
 265
 266 static void dump_args(void)
 267 {
 268         int i;
 269
 270         DEBUG(10, ("dumping argument values:\n"));
 271         for (i = 0; i < ARRAY_SIZE(args); ++i) {
 272                 switch (args[i].arg_type) {
 273                         case ARG_NUMERIC:
 274                         case ARG_SIZE:
 275                                 DEBUG(10, ("\t%s=%llu\n", args[i].arg_name,
 276                                         (unsigned long long)args[i].arg_val.nval));
 277                                 break;
 278                         case ARG_BOOL:
 279                                 DEBUG(10, ("\t%s=%s\n", args[i].arg_name,
 280                                         args[i].arg_val.bval ? "yes" : "no"));
 281                                 break;
 282                         case ARG_PATHNAME:
 283                                 DEBUG(10, ("\t%s=%s\n", args[i].arg_name,
 284                                         args[i].arg_val.pval ?
 285                                                 args[i].arg_val.pval :
 286                                                 "(NULL)"));
 287                                 break;
 288                         default:
 289                                 SMB_ASSERT(0);
 290                 }
 291         }
 292 }
 293
 294 static void cifsdd_help_message(poptContext pctx,
 295                 enum poptCallbackReason preason,
 296                 struct poptOption * poption,
 297                 const char * parg,
 298                 void * pdata)
 299 {
 300         static const char notes[] =
 301 "FILE can be a local filename or a UNC path of the form //server/share/path.\n";
 302
 303         char prefix[24];
 304         int i;
 305
 306         if (poption->shortName != '?') {
 307                 poptPrintUsage(pctx, stdout, 0);
 308                 fprintf(stdout, "        [dd options]\n");
 309                 exit(0);
 310         }
 311
 312         poptPrintHelp(pctx, stdout, 0);
 313         fprintf(stdout, "\nCIFS dd options:\n");
 314
 315         for (i = 0; i < ARRAY_SIZE(args); ++i) {
 316                 if (args[i].arg_name == NULL) {
 317                         break;
 318                 }
 319
 320                 snprintf(prefix, sizeof(prefix), "%s=%-*s",
 321                         args[i].arg_name,
 322                         (int)(sizeof(prefix) - strlen(args[i].arg_name) - 2),
 323                         argtype_str(args[i].arg_type));
 324                 prefix[sizeof(prefix) - 1] = '\0';
 325                 fprintf(stdout, "  %s%s\n", prefix, args[i].arg_help);
 326         }
 327
 328         fprintf(stdout, "\n%s\n", notes);
 329         exit(0);
 330 }
 331
 332 /* ------------------------------------------------------------------------- */
 333 /* Main block copying routine.                                               */
 334 /* ------------------------------------------------------------------------- */
 335
 336 static void print_transfer_stats(void)
 337 {
 338         if (DEBUGLEVEL > 0) {
 339                 printf("%llu+%llu records in (%llu bytes)\n"
 340                         "%llu+%llu records out (%llu bytes)\n",
 341                         (unsigned long long)dd_stats.in.fblocks,
 342                         (unsigned long long)dd_stats.in.pblocks,
 343                         (unsigned long long)dd_stats.in.bytes,
 344                         (unsigned long long)dd_stats.out.fblocks,
 345                         (unsigned long long)dd_stats.out.pblocks,
 346                         (unsigned long long)dd_stats.out.bytes);
 347         } else {
 348                 printf("%llu+%llu records in\n%llu+%llu records out\n",
 349                                 (unsigned long long)dd_stats.in.fblocks,
 350                                 (unsigned long long)dd_stats.in.pblocks,
 351                                 (unsigned long long)dd_stats.out.fblocks,
 352                                 (unsigned long long)dd_stats.out.pblocks);
 353         }
 354 }
 355
 356 static struct dd_iohandle * open_file(struct resolve_context *resolve_ctx,
 357                                       struct tevent_context *ev,
 358                                       const char * which, const char **ports,
 359                                       struct smbcli_options *smb_options,
 360                                       const char *socket_options,
 361                                       struct smbcli_session_options *smb_session_options,
 362                                       struct gensec_settings *gensec_settings)
 363 {
 364         int                     options = 0;
 365         const char *            path = NULL;
 366         struct dd_iohandle *    handle = NULL;
 367
 368         if (check_arg_bool("direct")) {
 369                 options |= DD_DIRECT_IO;
 370         }
 371
 372         if (check_arg_bool("sync")) {
 373                 options |= DD_SYNC_IO;
 374         }
 375
 376         if (check_arg_bool("oplock")) {
 377                 options |= DD_OPLOCK;
 378         }
 379
 380         if (strcmp(which, "if") == 0) {
 381                 path = check_arg_pathname("if");
 382                 handle = dd_open_path(resolve_ctx, ev, path, ports,
 383                                       check_arg_numeric("ibs"), options,
 384                                       socket_options,
 385                                       smb_options, smb_session_options,
 386                                       gensec_settings);
 387         } else if (strcmp(which, "of") == 0) {
 388                 options |= DD_WRITE;
 389                 path = check_arg_pathname("of");
 390                 handle = dd_open_path(resolve_ctx, ev, path, ports,
 391                                       check_arg_numeric("obs"), options,
 392                                       socket_options,
 393                                       smb_options, smb_session_options,
 394                                       gensec_settings);
 395         } else {
 396                 SMB_ASSERT(0);
 397                 return(NULL);
 398         }
 399
 400         if (!handle) {
 401                 fprintf(stderr, "%s: failed to open %s\n", PROGNAME, path);
 402         }
 403
 404         return(handle);
 405 }
 406
 407 static int copy_files(struct tevent_context *ev, struct loadparm_context *lp_ctx)
 408 {
 409         uint8_t *       iobuf;  /* IO buffer. */
 410         uint64_t        iomax;  /* Size of the IO buffer. */
 411         uint64_t        data_size; /* Amount of data in the IO buffer. */
 412
 413         uint64_t        ibs;
 414         uint64_t        obs;
 415         uint64_t        count;
 416
 417         struct dd_iohandle *    ifile;
 418         struct dd_iohandle *    ofile;
 419
 420         struct smbcli_options options;
 421         struct smbcli_session_options session_options;
 422
 423         ibs = check_arg_numeric("ibs");
 424         obs = check_arg_numeric("obs");
 425         count = check_arg_numeric("count");
 426
 427         lpcfg_smbcli_options(lp_ctx, &options);
 428         lpcfg_smbcli_session_options(lp_ctx, &session_options);
 429
 430         /* Allocate IO buffer. We need more than the max IO size because we
 431          * could accumulate a remainder if ibs and obs don't match.
 432          */
 433         iomax = 2 * MAX(ibs, obs);
 434         if ((iobuf = malloc_array_p(uint8_t, iomax)) == NULL) {
 435                 fprintf(stderr,
 436                         "%s: failed to allocate IO buffer of %llu bytes\n",
 437                         PROGNAME, (unsigned long long)iomax);
 438                 return(EOM_EXIT_CODE);
 439         }
 440
 441         options.max_xmit = MAX(ibs, obs);
 442
 443         DEBUG(4, ("IO buffer size is %llu, max xmit is %d\n",
 444                         (unsigned long long)iomax, options.max_xmit));
 445
 446         if (!(ifile = open_file(lpcfg_resolve_context(lp_ctx), ev, "if",
 447                                 lpcfg_smb_ports(lp_ctx), &options,
 448                                 lpcfg_socket_options(lp_ctx),
 449                                 &session_options,
 450                                 lpcfg_gensec_settings(lp_ctx, lp_ctx)))) {
 451                 return(FILESYS_EXIT_CODE);
 452         }
 453
 454         if (!(ofile = open_file(lpcfg_resolve_context(lp_ctx), ev, "of",
 455                                 lpcfg_smb_ports(lp_ctx), &options,
 456                                 lpcfg_socket_options(lp_ctx),
 457                                 &session_options,
 458                                 lpcfg_gensec_settings(lp_ctx, lp_ctx)))) {
 459                 return(FILESYS_EXIT_CODE);
 460         }
 461
 462         /* Seek the files to their respective starting points. */
 463         ifile->io_seek(ifile, check_arg_numeric("skip") * ibs);
 464         ofile->io_seek(ofile, check_arg_numeric("seek") * obs);
 465
 466         DEBUG(4, ("max xmit was negotiated to be %d\n", options.max_xmit));
 467
 468         for (data_size = 0;;) {
 469
 470                 /* Handle signals. We are somewhat compatible with GNU dd.
 471                  * SIGINT makes us stop, but still print transfer statistics.
 472                  * SIGUSR1 makes us print transfer statistics but we continue
 473                  * copying.
 474                  */
 475                 if (dd_sigint) {
 476                         break;
 477                 }
 478
 479                 if (dd_sigusr1) {
 480                         print_transfer_stats();
 481                         dd_sigusr1 = 0;
 482                 }
 483
 484                 if (ifile->io_flags & DD_END_OF_FILE) {
 485                         DEBUG(4, ("flushing %llu bytes at EOF\n",
 486                                         (unsigned long long)data_size));
 487                         while (data_size > 0) {
 488                                 if (!dd_flush_block(ofile, iobuf,
 489                                                         &data_size, obs)) {
 490                                         return(IOERROR_EXIT_CODE);
 491                                 }
 492                         }
 493                         goto done;
 494                 }
 495
 496                 /* Try and read enough blocks of ibs bytes to be able write
 497                  * out one of obs bytes.
 498                  */
 499                 if (!dd_fill_block(ifile, iobuf, &data_size, obs, ibs)) {
 500                         return(IOERROR_EXIT_CODE);
 501                 }
 502
 503                 if (data_size == 0) {
 504                         /* Done. */
 505                         SMB_ASSERT(ifile->io_flags & DD_END_OF_FILE);
 506                 }
 507
 508                 /* Stop reading when we hit the block count. */
 509                 if (dd_stats.in.bytes >= (ibs * count)) {
 510                         ifile->io_flags |= DD_END_OF_FILE;
 511                 }
 512
 513                 /* If we wanted to be a legitimate dd, we would do character
 514                  * conversions and other shenanigans here.
 515                  */
 516
 517                 /* Flush what we read in units of obs bytes. We want to have
 518                  * at least obs bytes in the IO buffer but might not if the
 519                  * file is too small.
 520                  */
 521                 if (data_size &&
 522                     !dd_flush_block(ofile, iobuf, &data_size, obs)) {
 523                         return(IOERROR_EXIT_CODE);
 524                 }
 525         }
 526
 527 done:
 528         print_transfer_stats();
 529         return(0);
 530 }
 531
 532 /* ------------------------------------------------------------------------- */
 533 /* Main.                                                                     */
 534 /* ------------------------------------------------------------------------- */
 535
 536 struct poptOption cifsddHelpOptions[] = {
 537   { NULL, '\0', POPT_ARG_CALLBACK, (void *)&cifsdd_help_message, '\0', NULL, NULL },
 538   { "help", '?', 0, NULL, '?', "Show this help message", NULL },
 539   { "usage", '\0', 0, NULL, 'u', "Display brief usage message", NULL },
 540   { NULL }
 541 } ;
 542
 543 int main(int argc, const char ** argv)
 544 {
 545         int i;
 546         const char ** dd_args;
 547         struct tevent_context *ev;
 548
 549         poptContext pctx;
 550         struct poptOption poptions[] = {
 551                 /* POPT_AUTOHELP */
 552                 { NULL, '\0', POPT_ARG_INCLUDE_TABLE, cifsddHelpOptions,
 553                         0, "Help options:", NULL },
 554                 POPT_COMMON_SAMBA
 555                 POPT_COMMON_CONNECTION
 556                 POPT_COMMON_CREDENTIALS
 557                 POPT_COMMON_VERSION
 558                 { NULL }
 559         };
 560
 561         /* Block sizes. */
 562         set_arg_val("bs", (uint64_t)4096);
 563         set_arg_val("ibs", (uint64_t)4096);
 564         set_arg_val("obs", (uint64_t)4096);
 565         /* Block counts. */
 566         set_arg_val("count", (uint64_t)-1);
 567         set_arg_val("seek", (uint64_t)0);
 568         set_arg_val("seek", (uint64_t)0);
 569         /* Files. */
 570         set_arg_val("if", NULL);
 571         set_arg_val("of", NULL);
 572         /* Options. */
 573         set_arg_val("direct", false);
 574         set_arg_val("sync", false);
 575         set_arg_val("oplock", false);
 576
 577         pctx = poptGetContext(PROGNAME, argc, argv, poptions, 0);
 578         while ((i = poptGetNextOpt(pctx)) != -1) {
 579                 ;
 580         }
 581
 582         for (dd_args = poptGetArgs(pctx); dd_args && *dd_args; ++dd_args) {
 583
 584                 if (!set_arg_argv(*dd_args)) {
 585                         fprintf(stderr, "%s: invalid option: %s\n",
 586                                         PROGNAME, *dd_args);
 587                         exit(SYNTAX_EXIT_CODE);
 588                 }
 589
 590                 /* "bs" has the side-effect of setting "ibs" and "obs". */
 591                 if (strncmp(*dd_args, "bs=", 3) == 0) {
 592                         uint64_t bs = check_arg_numeric("bs");
 593                         set_arg_val("ibs", bs);
 594                         set_arg_val("obs", bs);
 595                 }
 596         }
 597
 598         ev = s4_event_context_init(talloc_autofree_context());
 599
 600         gensec_init(cmdline_lp_ctx);
 601         dump_args();
 602
 603         if (check_arg_numeric("ibs") == 0 || check_arg_numeric("ibs") == 0) {
 604                 fprintf(stderr, "%s: block sizes must be greater that zero\n",
 605                                 PROGNAME);
 606                 exit(SYNTAX_EXIT_CODE);
 607         }
 608
 609         if (check_arg_pathname("if") == NULL) {
 610                 fprintf(stderr, "%s: missing input filename\n", PROGNAME);
 611                 exit(SYNTAX_EXIT_CODE);
 612         }
 613
 614         if (check_arg_pathname("of") == NULL) {
 615                 fprintf(stderr, "%s: missing output filename\n", PROGNAME);
 616                 exit(SYNTAX_EXIT_CODE);
 617         }
 618
 619         CatchSignal(SIGINT, dd_handle_signal);
 620         CatchSignal(SIGUSR1, dd_handle_signal);
 621         return(copy_files(ev, cmdline_lp_ctx));
 622 }
 623
 624 /* vim: set sw=8 sts=8 ts=8 tw=79 : */