1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at https://curl.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 * SPDX-License-Identifier: curl 22 * 23 ***************************************************************************/ 24 25#include "curl_setup.h" 26 27#ifndef CURL_DISABLE_FILE 28 29#ifdef HAVE_NETINET_IN_H 30#include <netinet/in.h> 31#endif 32#ifdef HAVE_NETDB_H 33#include <netdb.h> 34#endif 35#ifdef HAVE_ARPA_INET_H 36#include <arpa/inet.h> 37#endif 38#ifdef HAVE_NET_IF_H 39#include <net/if.h> 40#endif 41#ifdef HAVE_SYS_IOCTL_H 42#include <sys/ioctl.h> 43#endif 44 45#ifdef HAVE_SYS_PARAM_H 46#include <sys/param.h> 47#endif 48 49#ifdef HAVE_FCNTL_H 50#include <fcntl.h> 51#endif 52 53#include "strtoofft.h" 54#include "urldata.h" 55#include <curl/curl.h> 56#include "progress.h" 57#include "sendf.h" 58#include "escape.h" 59#include "file.h" 60#include "speedcheck.h" 61#include "getinfo.h" 62#include "transfer.h" 63#include "url.h" 64#include "parsedate.h" /* for the week day and month names */ 65#include "warnless.h" 66#include "curl_range.h" 67/* The last 3 #include files should be in this order */ 68#include "curl_printf.h" 69#include "curl_memory.h" 70#include "memdebug.h" 71 72#if defined(_WIN32) || defined(MSDOS) || defined(__EMX__) 73#define DOS_FILESYSTEM 1 74#elif defined(__amigaos4__) 75#define AMIGA_FILESYSTEM 1 76#endif 77 78#ifdef OPEN_NEEDS_ARG3 79# define open_readonly(p,f) open((p),(f),(0)) 80#else 81# define open_readonly(p,f) open((p),(f)) 82#endif 83 84/* 85 * Forward declarations. 86 */ 87 88static CURLcode file_do(struct Curl_easy *data, bool *done); 89static CURLcode file_done(struct Curl_easy *data, 90 CURLcode status, bool premature); 91static CURLcode file_connect(struct Curl_easy *data, bool *done); 92static CURLcode file_disconnect(struct Curl_easy *data, 93 struct connectdata *conn, 94 bool dead_connection); 95static CURLcode file_setup_connection(struct Curl_easy *data, 96 struct connectdata *conn); 97 98/* 99 * FILE scheme handler. 100 */ 101 102const struct Curl_handler Curl_handler_file = { 103 "FILE", /* scheme */ 104 file_setup_connection, /* setup_connection */ 105 file_do, /* do_it */ 106 file_done, /* done */ 107 ZERO_NULL, /* do_more */ 108 file_connect, /* connect_it */ 109 ZERO_NULL, /* connecting */ 110 ZERO_NULL, /* doing */ 111 ZERO_NULL, /* proto_getsock */ 112 ZERO_NULL, /* doing_getsock */ 113 ZERO_NULL, /* domore_getsock */ 114 ZERO_NULL, /* perform_getsock */ 115 file_disconnect, /* disconnect */ 116 ZERO_NULL, /* write_resp */ 117 ZERO_NULL, /* connection_check */ 118 ZERO_NULL, /* attach connection */ 119 0, /* defport */ 120 CURLPROTO_FILE, /* protocol */ 121 CURLPROTO_FILE, /* family */ 122 PROTOPT_NONETWORK | PROTOPT_NOURLQUERY /* flags */ 123}; 124 125 126static CURLcode file_setup_connection(struct Curl_easy *data, 127 struct connectdata *conn) 128{ 129 (void)conn; 130 /* allocate the FILE specific struct */ 131 data->req.p.file = calloc(1, sizeof(struct FILEPROTO)); 132 if(!data->req.p.file) 133 return CURLE_OUT_OF_MEMORY; 134 135 return CURLE_OK; 136} 137 138/* 139 * file_connect() gets called from Curl_protocol_connect() to allow us to 140 * do protocol-specific actions at connect-time. We emulate a 141 * connect-then-transfer protocol and "connect" to the file here 142 */ 143static CURLcode file_connect(struct Curl_easy *data, bool *done) 144{ 145 char *real_path; 146 struct FILEPROTO *file = data->req.p.file; 147 int fd; 148#ifdef DOS_FILESYSTEM 149 size_t i; 150 char *actual_path; 151#endif 152 size_t real_path_len; 153 CURLcode result; 154 155 if(file->path) { 156 /* already connected. 157 * the handler->connect_it() is normally only called once, but 158 * FILE does a special check on setting up the connection which 159 * calls this explicitly. */ 160 *done = TRUE; 161 return CURLE_OK; 162 } 163 164 result = Curl_urldecode(data->state.up.path, 0, &real_path, 165 &real_path_len, REJECT_ZERO); 166 if(result) 167 return result; 168 169#ifdef DOS_FILESYSTEM 170 /* If the first character is a slash, and there's 171 something that looks like a drive at the beginning of 172 the path, skip the slash. If we remove the initial 173 slash in all cases, paths without drive letters end up 174 relative to the current directory which isn't how 175 browsers work. 176 177 Some browsers accept | instead of : as the drive letter 178 separator, so we do too. 179 180 On other platforms, we need the slash to indicate an 181 absolute pathname. On Windows, absolute paths start 182 with a drive letter. 183 */ 184 actual_path = real_path; 185 if((actual_path[0] == '/') && 186 actual_path[1] && 187 (actual_path[2] == ':' || actual_path[2] == '|')) { 188 actual_path[2] = ':'; 189 actual_path++; 190 real_path_len--; 191 } 192 193 /* change path separators from '/' to '\\' for DOS, Windows and OS/2 */ 194 for(i = 0; i < real_path_len; ++i) 195 if(actual_path[i] == '/') 196 actual_path[i] = '\\'; 197 else if(!actual_path[i]) { /* binary zero */ 198 Curl_safefree(real_path); 199 return CURLE_URL_MALFORMAT; 200 } 201 202 fd = open_readonly(actual_path, O_RDONLY|O_BINARY); 203 file->path = actual_path; 204#else 205 if(memchr(real_path, 0, real_path_len)) { 206 /* binary zeroes indicate foul play */ 207 Curl_safefree(real_path); 208 return CURLE_URL_MALFORMAT; 209 } 210 211 #ifdef AMIGA_FILESYSTEM 212 /* 213 * A leading slash in an AmigaDOS path denotes the parent 214 * directory, and hence we block this as it is relative. 215 * Absolute paths start with 'volumename:', so we check for 216 * this first. Failing that, we treat the path as a real unix 217 * path, but only if the application was compiled with -lunix. 218 */ 219 fd = -1; 220 file->path = real_path; 221 222 if(real_path[0] == '/') { 223 extern int __unix_path_semantics; 224 if(strchr(real_path + 1, ':')) { 225 /* Amiga absolute path */ 226 fd = open_readonly(real_path + 1, O_RDONLY); 227 file->path++; 228 } 229 else if(__unix_path_semantics) { 230 /* -lunix fallback */ 231 fd = open_readonly(real_path, O_RDONLY); 232 } 233 } 234 #else 235 fd = open_readonly(real_path, O_RDONLY); 236 file->path = real_path; 237 #endif 238#endif 239 Curl_safefree(file->freepath); 240 file->freepath = real_path; /* free this when done */ 241 242 file->fd = fd; 243 if(!data->state.upload && (fd == -1)) { 244 failf(data, "Couldn't open file %s", data->state.up.path); 245 file_done(data, CURLE_FILE_COULDNT_READ_FILE, FALSE); 246 return CURLE_FILE_COULDNT_READ_FILE; 247 } 248 *done = TRUE; 249 250 return CURLE_OK; 251} 252 253static CURLcode file_done(struct Curl_easy *data, 254 CURLcode status, bool premature) 255{ 256 struct FILEPROTO *file = data->req.p.file; 257 (void)status; /* not used */ 258 (void)premature; /* not used */ 259 260 if(file) { 261 Curl_safefree(file->freepath); 262 file->path = NULL; 263 if(file->fd != -1) 264 close(file->fd); 265 file->fd = -1; 266 } 267 268 return CURLE_OK; 269} 270 271static CURLcode file_disconnect(struct Curl_easy *data, 272 struct connectdata *conn, 273 bool dead_connection) 274{ 275 (void)dead_connection; /* not used */ 276 (void)conn; 277 return file_done(data, CURLE_OK, FALSE); 278} 279 280#ifdef DOS_FILESYSTEM 281#define DIRSEP '\\' 282#else 283#define DIRSEP '/' 284#endif 285 286static CURLcode file_upload(struct Curl_easy *data) 287{ 288 struct FILEPROTO *file = data->req.p.file; 289 const char *dir = strchr(file->path, DIRSEP); 290 int fd; 291 int mode; 292 CURLcode result = CURLE_OK; 293 char buffer[8*1024], *uphere_save; 294 curl_off_t bytecount = 0; 295 struct_stat file_stat; 296 const char *sendbuf; 297 298 /* 299 * Since FILE: doesn't do the full init, we need to provide some extra 300 * assignments here. 301 */ 302 303 if(!dir) 304 return CURLE_FILE_COULDNT_READ_FILE; /* fix: better error code */ 305 306 if(!dir[1]) 307 return CURLE_FILE_COULDNT_READ_FILE; /* fix: better error code */ 308 309#ifdef O_BINARY 310#define MODE_DEFAULT O_WRONLY|O_CREAT|O_BINARY 311#else 312#define MODE_DEFAULT O_WRONLY|O_CREAT 313#endif 314 315 if(data->state.resume_from) 316 mode = MODE_DEFAULT|O_APPEND; 317 else 318 mode = MODE_DEFAULT|O_TRUNC; 319 320 fd = open(file->path, mode, data->set.new_file_perms); 321 if(fd < 0) { 322 failf(data, "Can't open %s for writing", file->path); 323 return CURLE_WRITE_ERROR; 324 } 325 326 if(-1 != data->state.infilesize) 327 /* known size of data to "upload" */ 328 Curl_pgrsSetUploadSize(data, data->state.infilesize); 329 330 /* treat the negative resume offset value as the case of "-" */ 331 if(data->state.resume_from < 0) { 332 if(fstat(fd, &file_stat)) { 333 close(fd); 334 failf(data, "Can't get the size of %s", file->path); 335 return CURLE_WRITE_ERROR; 336 } 337 data->state.resume_from = (curl_off_t)file_stat.st_size; 338 } 339 340 /* Yikes! Curl_fillreadbuffer uses data->req.upload_fromhere to READ 341 * client data to! Please, someone fix... */ 342 uphere_save = data->req.upload_fromhere; 343 while(!result) { 344 size_t nread; 345 ssize_t nwrite; 346 size_t readcount; 347 data->req.upload_fromhere = buffer; 348 result = Curl_fillreadbuffer(data, sizeof(buffer), &readcount); 349 if(result) 350 break; 351 352 if(!readcount) 353 break; 354 355 nread = readcount; 356 357 /* skip bytes before resume point */ 358 if(data->state.resume_from) { 359 if((curl_off_t)nread <= data->state.resume_from) { 360 data->state.resume_from -= nread; 361 nread = 0; 362 sendbuf = buffer; 363 } 364 else { 365 sendbuf = buffer + data->state.resume_from; 366 nread -= (size_t)data->state.resume_from; 367 data->state.resume_from = 0; 368 } 369 } 370 else 371 sendbuf = buffer; 372 373 /* write the data to the target */ 374 nwrite = write(fd, sendbuf, nread); 375 if((size_t)nwrite != nread) { 376 result = CURLE_SEND_ERROR; 377 break; 378 } 379 380 bytecount += nread; 381 382 Curl_pgrsSetUploadCounter(data, bytecount); 383 384 if(Curl_pgrsUpdate(data)) 385 result = CURLE_ABORTED_BY_CALLBACK; 386 else 387 result = Curl_speedcheck(data, Curl_now()); 388 } 389 if(!result && Curl_pgrsUpdate(data)) 390 result = CURLE_ABORTED_BY_CALLBACK; 391 392 close(fd); 393 data->req.upload_fromhere = uphere_save; 394 395 return result; 396} 397 398/* 399 * file_do() is the protocol-specific function for the do-phase, separated 400 * from the connect-phase above. Other protocols merely setup the transfer in 401 * the do-phase, to have it done in the main transfer loop but since some 402 * platforms we support don't allow select()ing etc on file handles (as 403 * opposed to sockets) we instead perform the whole do-operation in this 404 * function. 405 */ 406static CURLcode file_do(struct Curl_easy *data, bool *done) 407{ 408 /* This implementation ignores the host name in conformance with 409 RFC 1738. Only local files (reachable via the standard file system) 410 are supported. This means that files on remotely mounted directories 411 (via NFS, Samba, NT sharing) can be accessed through a file:// URL 412 */ 413 CURLcode result = CURLE_OK; 414 struct_stat statbuf; /* struct_stat instead of struct stat just to allow the 415 Windows version to have a different struct without 416 having to redefine the simple word 'stat' */ 417 curl_off_t expected_size = -1; 418 bool size_known; 419 bool fstated = FALSE; 420 int fd; 421 struct FILEPROTO *file; 422 423 *done = TRUE; /* unconditionally */ 424 425 if(data->state.upload) 426 return file_upload(data); 427 428 file = data->req.p.file; 429 430 /* get the fd from the connection phase */ 431 fd = file->fd; 432 433 /* VMS: This only works reliable for STREAMLF files */ 434 if(-1 != fstat(fd, &statbuf)) { 435 if(!S_ISDIR(statbuf.st_mode)) 436 expected_size = statbuf.st_size; 437 /* and store the modification time */ 438 data->info.filetime = statbuf.st_mtime; 439 fstated = TRUE; 440 } 441 442 if(fstated && !data->state.range && data->set.timecondition) { 443 if(!Curl_meets_timecondition(data, data->info.filetime)) { 444 *done = TRUE; 445 return CURLE_OK; 446 } 447 } 448 449 if(fstated) { 450 time_t filetime; 451 struct tm buffer; 452 const struct tm *tm = &buffer; 453 char header[80]; 454 int headerlen; 455 char accept_ranges[24]= { "Accept-ranges: bytes\r\n" }; 456 if(expected_size >= 0) { 457 headerlen = msnprintf(header, sizeof(header), 458 "Content-Length: %" CURL_FORMAT_CURL_OFF_T "\r\n", 459 expected_size); 460 result = Curl_client_write(data, CLIENTWRITE_HEADER, header, headerlen); 461 if(result) 462 return result; 463 464 result = Curl_client_write(data, CLIENTWRITE_HEADER, 465 accept_ranges, strlen(accept_ranges)); 466 if(result != CURLE_OK) 467 return result; 468 } 469 470 filetime = (time_t)statbuf.st_mtime; 471 result = Curl_gmtime(filetime, &buffer); 472 if(result) 473 return result; 474 475 /* format: "Tue, 15 Nov 1994 12:45:26 GMT" */ 476 headerlen = msnprintf(header, sizeof(header), 477 "Last-Modified: %s, %02d %s %4d %02d:%02d:%02d GMT\r\n%s", 478 Curl_wkday[tm->tm_wday?tm->tm_wday-1:6], 479 tm->tm_mday, 480 Curl_month[tm->tm_mon], 481 tm->tm_year + 1900, 482 tm->tm_hour, 483 tm->tm_min, 484 tm->tm_sec, 485 data->req.no_body ? "": "\r\n"); 486 result = Curl_client_write(data, CLIENTWRITE_HEADER, header, headerlen); 487 if(result) 488 return result; 489 /* set the file size to make it available post transfer */ 490 Curl_pgrsSetDownloadSize(data, expected_size); 491 if(data->req.no_body) 492 return result; 493 } 494 495 /* Check whether file range has been specified */ 496 result = Curl_range(data); 497 if(result) 498 return result; 499 500 /* Adjust the start offset in case we want to get the N last bytes 501 * of the stream if the filesize could be determined */ 502 if(data->state.resume_from < 0) { 503 if(!fstated) { 504 failf(data, "Can't get the size of file."); 505 return CURLE_READ_ERROR; 506 } 507 data->state.resume_from += (curl_off_t)statbuf.st_size; 508 } 509 510 if(data->state.resume_from > 0) { 511 /* We check explicitly if we have a start offset, because 512 * expected_size may be -1 if we don't know how large the file is, 513 * in which case we should not adjust it. */ 514 if(data->state.resume_from <= expected_size) 515 expected_size -= data->state.resume_from; 516 else { 517 failf(data, "failed to resume file:// transfer"); 518 return CURLE_BAD_DOWNLOAD_RESUME; 519 } 520 } 521 522 /* A high water mark has been specified so we obey... */ 523 if(data->req.maxdownload > 0) 524 expected_size = data->req.maxdownload; 525 526 if(!fstated || (expected_size <= 0)) 527 size_known = FALSE; 528 else 529 size_known = TRUE; 530 531 /* The following is a shortcut implementation of file reading 532 this is both more efficient than the former call to download() and 533 it avoids problems with select() and recv() on file descriptors 534 in Winsock */ 535 if(size_known) 536 Curl_pgrsSetDownloadSize(data, expected_size); 537 538 if(data->state.resume_from) { 539 if(data->state.resume_from != 540 lseek(fd, data->state.resume_from, SEEK_SET)) 541 return CURLE_BAD_DOWNLOAD_RESUME; 542 } 543 544 Curl_pgrsTime(data, TIMER_STARTTRANSFER); 545 546 while(!result) { 547 char tmpbuf[8*1024]; 548 ssize_t nread; 549 /* Don't fill a whole buffer if we want less than all data */ 550 size_t bytestoread; 551 552 if(size_known) { 553 bytestoread = (expected_size < (curl_off_t)(sizeof(tmpbuf)-1)) ? 554 curlx_sotouz(expected_size) : (sizeof(tmpbuf)-1); 555 } 556 else 557 bytestoread = sizeof(tmpbuf)-1; 558 559 nread = read(fd, tmpbuf, bytestoread); 560 561 if(nread > 0) 562 tmpbuf[nread] = 0; 563 564 if(nread <= 0 || (size_known && (expected_size == 0))) 565 break; 566 567 if(size_known) 568 expected_size -= nread; 569 570 result = Curl_client_write(data, CLIENTWRITE_BODY, tmpbuf, nread); 571 if(result) 572 return result; 573 574 if(Curl_pgrsUpdate(data)) 575 result = CURLE_ABORTED_BY_CALLBACK; 576 else 577 result = Curl_speedcheck(data, Curl_now()); 578 } 579 if(Curl_pgrsUpdate(data)) 580 result = CURLE_ABORTED_BY_CALLBACK; 581 582 return result; 583} 584 585#endif 586