| 1 |
/* |
| 2 |
* Hydra, an http server |
| 3 |
* Copyright (C) 1995 Paul Phillips <paulp@go2net.com> |
| 4 |
* Some changes Copyright (C) 1996,99 Larry Doolittle <ldoolitt@boa.org> |
| 5 |
* Some changes Copyright (C) 1996-2002 Jon Nelson <jnelson@boa.org> |
| 6 |
* Portions Copyright (C) 2002 Nikos Mavroyanopoulos <nmav@gnutls.org> |
| 7 |
* |
| 8 |
* This program is free software; you can redistribute it and/or modify |
| 9 |
* it under the terms of the GNU General Public License as published by |
| 10 |
* the Free Software Foundation; either version 1, or (at your option) |
| 11 |
* any later version. |
| 12 |
* |
| 13 |
* This program is distributed in the hope that it will be useful, |
| 14 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 |
* GNU General Public License for more details. |
| 17 |
* |
| 18 |
* You should have received a copy of the GNU General Public License |
| 19 |
* along with this program; if not, write to the Free Software |
| 20 |
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 |
* |
| 22 |
*/ |
| 23 |
|
| 24 |
/* $Id: get.c,v 1.13 2002/09/28 16:32:37 nmav Exp $*/ |
| 25 |
|
| 26 |
#include "boa.h" |
| 27 |
#include "socket.h" |
| 28 |
|
| 29 |
/* local prototypes */ |
| 30 |
int get_cachedir_file(request * req, struct stat *statbuf); |
| 31 |
int index_directory(request * req, char *dest_filename); |
| 32 |
|
| 33 |
/* |
| 34 |
* Name: init_get |
| 35 |
* Description: Initializes a non-script GET or HEAD request. |
| 36 |
* |
| 37 |
* Return values: |
| 38 |
* 0: finished or error, request will be freed |
| 39 |
* 1: successfully initialized, added to ready queue |
| 40 |
*/ |
| 41 |
|
| 42 |
int init_get(server_params * params, request * req) |
| 43 |
{ |
| 44 |
int data_fd, saved_errno; |
| 45 |
struct stat statbuf; |
| 46 |
volatile int bytes; |
| 47 |
|
| 48 |
data_fd = open(req->pathname, O_RDONLY); |
| 49 |
saved_errno = errno; /* might not get used */ |
| 50 |
|
| 51 |
if (data_fd == -1) { |
| 52 |
log_error_doc(req); |
| 53 |
errno = saved_errno; |
| 54 |
perror("document open"); |
| 55 |
|
| 56 |
if (saved_errno == ENOENT) |
| 57 |
send_r_not_found(req); |
| 58 |
else if (saved_errno == EACCES) |
| 59 |
send_r_forbidden(req); |
| 60 |
else |
| 61 |
send_r_bad_request(req); |
| 62 |
return 0; |
| 63 |
} |
| 64 |
|
| 65 |
if (fstat( data_fd, &statbuf) == -1) { |
| 66 |
/* this is quite impossible, since the file |
| 67 |
* was opened before. |
| 68 |
*/ |
| 69 |
close(data_fd); |
| 70 |
send_r_not_found(req); |
| 71 |
return 0; |
| 72 |
} |
| 73 |
|
| 74 |
if (S_ISDIR(statbuf.st_mode)) { /* directory */ |
| 75 |
close(data_fd); /* close dir */ |
| 76 |
|
| 77 |
if (req->pathname[strlen(req->pathname) - 1] != '/') { |
| 78 |
char buffer[3 * MAX_PATH_LENGTH + 128]; |
| 79 |
|
| 80 |
create_url( buffer, sizeof(buffer), req->secure, req->hostname, |
| 81 |
params->server_s[req->secure].port, req->request_uri); |
| 82 |
|
| 83 |
send_r_moved_perm(req, buffer); |
| 84 |
return 0; |
| 85 |
} |
| 86 |
data_fd = get_dir(req, &statbuf); /* updates statbuf */ |
| 87 |
|
| 88 |
if (data_fd == -1) /* couldn't do it */ |
| 89 |
return 0; /* errors reported by get_dir */ |
| 90 |
else if (data_fd <= 1) |
| 91 |
/* data_fd == 0 -> close it down, 1 -> continue */ |
| 92 |
return data_fd; |
| 93 |
/* else, data_fd contains the fd of the file... */ |
| 94 |
} |
| 95 |
|
| 96 |
if (req->if_modified_since && |
| 97 |
!modified_since(&(statbuf.st_mtime), req->if_modified_since)) { |
| 98 |
send_r_not_modified(req); |
| 99 |
close(data_fd); |
| 100 |
return 0; |
| 101 |
} |
| 102 |
req->filesize = statbuf.st_size; |
| 103 |
req->last_modified = statbuf.st_mtime; |
| 104 |
|
| 105 |
if (req->range_stop == 0) |
| 106 |
req->range_stop = statbuf.st_size; |
| 107 |
|
| 108 |
/* out of range! */ |
| 109 |
if (req->range_start > statbuf.st_size || |
| 110 |
req->range_stop > statbuf.st_size || |
| 111 |
req->range_stop < req->range_start) { |
| 112 |
send_r_range_unsatisfiable(req); |
| 113 |
close(data_fd); |
| 114 |
return 0; |
| 115 |
} |
| 116 |
|
| 117 |
if (req->method == M_HEAD || req->filesize == 0) { |
| 118 |
send_r_request_ok(req); |
| 119 |
close(data_fd); |
| 120 |
return 0; |
| 121 |
} |
| 122 |
|
| 123 |
if (req->range_stop > max_file_size_cache) { |
| 124 |
|
| 125 |
if ( req->range_start == 0 && req->range_stop == statbuf.st_size) |
| 126 |
send_r_request_ok(req); /* All's well */ |
| 127 |
else { |
| 128 |
/* if ranges were used, then lseek to the start given |
| 129 |
*/ |
| 130 |
if ( lseek( data_fd, req->range_start, SEEK_SET) == (off_t) -1) { |
| 131 |
close(data_fd); |
| 132 |
send_r_not_found(req); |
| 133 |
return 0; |
| 134 |
} |
| 135 |
send_r_request_partial(req);/* All's well */ |
| 136 |
} |
| 137 |
|
| 138 |
req->status = PIPE_READ; |
| 139 |
req->cgi_status = CGI_BUFFER; |
| 140 |
req->data_fd = data_fd; |
| 141 |
req_flush(req); /* this should *always* complete due to |
| 142 |
the size of the I/O buffers */ |
| 143 |
req->header_line = req->header_end = req->buffer; |
| 144 |
req->pipe_range_stop = req->range_stop; |
| 145 |
return 1; |
| 146 |
} |
| 147 |
|
| 148 |
if (req->range_stop == 0) { /* done */ |
| 149 |
send_r_request_ok(req); /* All's well *so far* */ |
| 150 |
close(data_fd); |
| 151 |
return 1; |
| 152 |
} |
| 153 |
|
| 154 |
/* NOTE: I (Jon Nelson) tried performing a read(2) |
| 155 |
* into the output buffer provided the file data would |
| 156 |
* fit, before mmapping, and if successful, writing that |
| 157 |
* and stopping there -- all to avoid the cost |
| 158 |
* of a mmap. Oddly, it was *slower* in benchmarks. |
| 159 |
*/ |
| 160 |
if (max_files_cache > 0) { |
| 161 |
req->mmap_entry_var = find_mmap(data_fd, &statbuf); |
| 162 |
if (req->mmap_entry_var == NULL) { |
| 163 |
req->buffer_end = 0; |
| 164 |
if (errno == ENOENT) |
| 165 |
send_r_not_found(req); |
| 166 |
else if (errno == EACCES) |
| 167 |
send_r_forbidden(req); |
| 168 |
else |
| 169 |
send_r_bad_request(req); |
| 170 |
close(data_fd); |
| 171 |
return 0; |
| 172 |
} |
| 173 |
req->data_mem = req->mmap_entry_var->mmap; |
| 174 |
} else { /* File caching is disabled. |
| 175 |
*/ |
| 176 |
req->data_mem = mmap(0, req->range_stop, PROT_READ, MAP_OPTIONS, data_fd, 0); |
| 177 |
} |
| 178 |
|
| 179 |
close(data_fd); /* close data file */ |
| 180 |
|
| 181 |
if ( req->data_mem == MAP_FAILED) { |
| 182 |
boa_perror(req, "mmap"); |
| 183 |
return 0; |
| 184 |
} |
| 185 |
|
| 186 |
if ( req->range_start == 0 && req->range_stop == statbuf.st_size) |
| 187 |
send_r_request_ok(req); /* All's well */ |
| 188 |
else |
| 189 |
send_r_request_partial(req);/* All's well */ |
| 190 |
|
| 191 |
bytes = BUFFER_SIZE - req->buffer_end; |
| 192 |
|
| 193 |
/* bytes is now how much the buffer can hold |
| 194 |
* after the headers |
| 195 |
*/ |
| 196 |
req->filepos = req->range_start; |
| 197 |
|
| 198 |
if (bytes > 0) { |
| 199 |
if (bytes > req->range_stop - req->range_start) |
| 200 |
bytes = req->range_stop - req->range_start; |
| 201 |
|
| 202 |
if (setjmp(params->env) == 0) { |
| 203 |
params->handle_sigbus = 1; |
| 204 |
memcpy(req->buffer + req->buffer_end, &req->data_mem[req->filepos], |
| 205 |
bytes); |
| 206 |
params->handle_sigbus = 0; |
| 207 |
/* OK, SIGBUS **after** this point is very bad! */ |
| 208 |
} else { |
| 209 |
char buf[30]; |
| 210 |
/* sigbus! */ |
| 211 |
log_error_doc(req); |
| 212 |
reset_output_buffer(req); |
| 213 |
send_r_error(req); |
| 214 |
get_commonlog_time( buf); |
| 215 |
fprintf(stderr, "%sGot SIGBUS in memcpy!\n", |
| 216 |
buf); |
| 217 |
return 0; |
| 218 |
} |
| 219 |
req->buffer_end += bytes; |
| 220 |
req->filepos += bytes; |
| 221 |
if (req->range_stop == req->filepos) { |
| 222 |
req_flush(req); |
| 223 |
req->status = DONE; |
| 224 |
} |
| 225 |
} |
| 226 |
|
| 227 |
/* We lose statbuf here, so make sure response has been sent */ |
| 228 |
return 1; |
| 229 |
} |
| 230 |
|
| 231 |
|
| 232 |
/* |
| 233 |
* Name: process_get |
| 234 |
* Description: Writes a chunk of data to the socket. |
| 235 |
* |
| 236 |
* Return values: |
| 237 |
* -1: request blocked, move to blocked queue |
| 238 |
* 0: EOF or error, close it down |
| 239 |
* 1: successful write, recycle in ready queue |
| 240 |
*/ |
| 241 |
|
| 242 |
int process_get(server_params * params, request * req) |
| 243 |
{ |
| 244 |
int bytes_written; |
| 245 |
volatile int bytes_to_write; |
| 246 |
|
| 247 |
bytes_to_write = req->range_stop - req->filepos; |
| 248 |
if (bytes_to_write > SOCKETBUF_SIZE) |
| 249 |
bytes_to_write = SOCKETBUF_SIZE; |
| 250 |
|
| 251 |
|
| 252 |
if (setjmp(params->env) == 0) { |
| 253 |
params->handle_sigbus = 1; |
| 254 |
|
| 255 |
bytes_written = |
| 256 |
socket_send(req, req->data_mem + req->filepos, bytes_to_write); |
| 257 |
|
| 258 |
params->handle_sigbus = 0; |
| 259 |
/* OK, SIGBUS **after** this point is very bad! */ |
| 260 |
} else { |
| 261 |
char buf[30]; |
| 262 |
/* sigbus! */ |
| 263 |
log_error_doc(req); |
| 264 |
/* sending an error here is inappropriate |
| 265 |
* if we are here, the file is mmapped, and thus, |
| 266 |
* a content-length has been sent. If we send fewer bytes |
| 267 |
* the client knows there has been a problem. |
| 268 |
* We run the risk of accidentally sending the right number |
| 269 |
* of bytes (or a few too many) and the client |
| 270 |
* won't be the wiser. |
| 271 |
*/ |
| 272 |
req->status = DEAD; |
| 273 |
get_commonlog_time( buf); |
| 274 |
fprintf(stderr, "%sGot SIGBUS in write(2)!\n", buf); |
| 275 |
return 0; |
| 276 |
} |
| 277 |
|
| 278 |
if (bytes_written < 0) { |
| 279 |
if (errno == EWOULDBLOCK || errno == EAGAIN) |
| 280 |
return -1; |
| 281 |
/* request blocked at the pipe level, but keep going */ |
| 282 |
else { |
| 283 |
if (errno != EPIPE) { |
| 284 |
log_error_doc(req); |
| 285 |
/* Can generate lots of log entries, */ |
| 286 |
perror("write"); |
| 287 |
/* OK to disable if your logs get too big */ |
| 288 |
} |
| 289 |
req->status = DEAD; |
| 290 |
return 0; |
| 291 |
} |
| 292 |
} |
| 293 |
req->filepos += bytes_written; |
| 294 |
|
| 295 |
if (req->filepos == req->range_stop) { /* EOF */ |
| 296 |
return 0; |
| 297 |
} else |
| 298 |
return 1; /* more to do */ |
| 299 |
} |
| 300 |
|
| 301 |
/* |
| 302 |
* Name: get_dir |
| 303 |
* Description: Called from process_get if the request is a directory. |
| 304 |
* statbuf must describe directory on input, since we may need its |
| 305 |
* device, inode, and mtime. |
| 306 |
* statbuf is updated, since we may need to check mtimes of a cache. |
| 307 |
* returns: |
| 308 |
* -1 error |
| 309 |
* 0 cgi (either gunzip or auto-generated) |
| 310 |
* >0 file descriptor of file |
| 311 |
*/ |
| 312 |
|
| 313 |
int get_dir(request * req, struct stat *statbuf) |
| 314 |
{ |
| 315 |
|
| 316 |
char* directory_index; |
| 317 |
int data_fd; |
| 318 |
|
| 319 |
directory_index = find_and_open_directory_index( req->pathname, 0, &data_fd); |
| 320 |
|
| 321 |
if (directory_index) { /* look for index.html first?? */ |
| 322 |
if (data_fd != -1) { /* user's index file */ |
| 323 |
int ret; |
| 324 |
|
| 325 |
/* Check if we can execute the file |
| 326 |
*/ |
| 327 |
|
| 328 |
strcat(req->request_uri, directory_index); |
| 329 |
|
| 330 |
ret = is_executable_cgi( req, directory_index); |
| 331 |
if ( ret != 0) { /* it is a CGI */ |
| 332 |
close( data_fd); /* we don't need it */ |
| 333 |
if (ret == -1) { |
| 334 |
send_r_error(req); |
| 335 |
return -1; |
| 336 |
} |
| 337 |
return init_cgi(req); |
| 338 |
} |
| 339 |
|
| 340 |
/* Not a cgi */ |
| 341 |
|
| 342 |
fstat(data_fd, statbuf); |
| 343 |
return data_fd; |
| 344 |
} |
| 345 |
if (errno == EACCES) { |
| 346 |
send_r_forbidden(req); |
| 347 |
return -1; |
| 348 |
} else if (errno != ENOENT) { |
| 349 |
/* if there is an error *other* than EACCES or ENOENT */ |
| 350 |
send_r_not_found(req); |
| 351 |
return -1; |
| 352 |
} |
| 353 |
} |
| 354 |
|
| 355 |
/* only here if index.html, index.html.gz don't exist */ |
| 356 |
if (dirmaker != NULL) { /* don't look for index.html... maybe automake? */ |
| 357 |
req->response_status = R_REQUEST_OK; |
| 358 |
SQUASH_KA(req); |
| 359 |
|
| 360 |
/* the indexer should take care of all headers */ |
| 361 |
if (!req->simple) { |
| 362 |
req_write(req, HTTP_VERSION" 200 OK\r\n"); |
| 363 |
print_http_headers(req); |
| 364 |
print_last_modified(req); |
| 365 |
req_write(req, "Content-Type: " TEXT_HTML CRLF CRLF); |
| 366 |
req_flush(req); |
| 367 |
} |
| 368 |
if (req->method == M_HEAD) |
| 369 |
return 0; |
| 370 |
|
| 371 |
req->is_cgi = INDEXER_CGI; |
| 372 |
return init_cgi(req); |
| 373 |
/* in this case, 0 means success */ |
| 374 |
} else if (cachedir) { |
| 375 |
return get_cachedir_file(req, statbuf); |
| 376 |
} else { /* neither index.html nor autogenerate are allowed */ |
| 377 |
send_r_forbidden(req); |
| 378 |
return -1; /* nothing worked */ |
| 379 |
} |
| 380 |
} |
| 381 |
|
| 382 |
int get_cachedir_file(request * req, struct stat *statbuf) |
| 383 |
{ |
| 384 |
|
| 385 |
char pathname_with_index[MAX_PATH_LENGTH]; |
| 386 |
int data_fd; |
| 387 |
time_t real_dir_mtime; |
| 388 |
|
| 389 |
real_dir_mtime = statbuf->st_mtime; |
| 390 |
sprintf(pathname_with_index, "%s/dir.%d.%ld", |
| 391 |
cachedir, (int) statbuf->st_dev, statbuf->st_ino); |
| 392 |
data_fd = open(pathname_with_index, O_RDONLY); |
| 393 |
|
| 394 |
if (data_fd != -1) { /* index cache */ |
| 395 |
|
| 396 |
fstat(data_fd, statbuf); |
| 397 |
if (statbuf->st_mtime > real_dir_mtime) { |
| 398 |
statbuf->st_mtime = real_dir_mtime; /* lie */ |
| 399 |
strcpy(req->request_uri, find_default_directory_index()); /* for mimetype */ |
| 400 |
return data_fd; |
| 401 |
} |
| 402 |
close(data_fd); |
| 403 |
unlink(pathname_with_index); /* cache is stale, delete it */ |
| 404 |
} |
| 405 |
if (index_directory(req, pathname_with_index) == -1) |
| 406 |
return -1; |
| 407 |
|
| 408 |
data_fd = open(pathname_with_index, O_RDONLY); /* Last chance */ |
| 409 |
if (data_fd != -1) { |
| 410 |
strcpy(req->request_uri, find_default_directory_index()); /* for mimetype */ |
| 411 |
fstat(data_fd, statbuf); |
| 412 |
statbuf->st_mtime = real_dir_mtime; /* lie */ |
| 413 |
return data_fd; |
| 414 |
} |
| 415 |
|
| 416 |
boa_perror(req, "re-opening dircache"); |
| 417 |
return -1; /* Nothing worked. */ |
| 418 |
|
| 419 |
} |
| 420 |
|
| 421 |
/* |
| 422 |
* Name: index_directory |
| 423 |
* Description: Called from get_cachedir_file if a directory html |
| 424 |
* has to be generated on the fly |
| 425 |
* returns -1 for problem, else 0 |
| 426 |
* This version is the fastest, ugliest, and most accurate yet. |
| 427 |
* It solves the "stale size or type" problem by not ever giving |
| 428 |
* the size or type. This also speeds it up since no per-file |
| 429 |
* stat() is required. |
| 430 |
*/ |
| 431 |
|
| 432 |
int index_directory(request * req, char *dest_filename) |
| 433 |
{ |
| 434 |
DIR *request_dir; |
| 435 |
FILE *fdstream; |
| 436 |
struct dirent *dirbuf; |
| 437 |
int bytes = 0; |
| 438 |
char *escname = NULL; |
| 439 |
|
| 440 |
if (chdir(req->pathname) == -1) { |
| 441 |
if (errno == EACCES || errno == EPERM) { |
| 442 |
send_r_forbidden(req); |
| 443 |
} else { |
| 444 |
log_error_doc(req); |
| 445 |
perror("chdir"); |
| 446 |
send_r_bad_request(req); |
| 447 |
} |
| 448 |
return -1; |
| 449 |
} |
| 450 |
|
| 451 |
request_dir = opendir("."); |
| 452 |
if (request_dir == NULL) { |
| 453 |
int errno_save = errno; |
| 454 |
send_r_error(req); |
| 455 |
log_error_time(); |
| 456 |
fprintf(stderr, "directory \"%s\": ", req->pathname); |
| 457 |
errno = errno_save; |
| 458 |
perror("opendir"); |
| 459 |
return -1; |
| 460 |
} |
| 461 |
|
| 462 |
fdstream = fopen(dest_filename, "w"); |
| 463 |
if (fdstream == NULL) { |
| 464 |
boa_perror(req, "dircache fopen"); |
| 465 |
closedir(request_dir); |
| 466 |
return -1; |
| 467 |
} |
| 468 |
|
| 469 |
bytes += fprintf(fdstream, |
| 470 |
"<HTML><HEAD>\n<TITLE>Index of %s</TITLE>\n</HEAD>\n\n", |
| 471 |
req->request_uri); |
| 472 |
bytes += |
| 473 |
fprintf(fdstream, "<BODY>\n\n<H2>Index of %s</H2>\n\n<PRE>\n", |
| 474 |
req->request_uri); |
| 475 |
|
| 476 |
while ((dirbuf = readdir(request_dir))) { |
| 477 |
if (!strcmp(dirbuf->d_name, ".")) |
| 478 |
continue; |
| 479 |
|
| 480 |
if (!strcmp(dirbuf->d_name, "..")) { |
| 481 |
bytes += fprintf(fdstream, |
| 482 |
" [DIR] <A HREF=\"../\">Parent Directory</A>\n"); |
| 483 |
continue; |
| 484 |
} |
| 485 |
|
| 486 |
if ((escname = escape_string(dirbuf->d_name, NULL)) != NULL) { |
| 487 |
bytes += fprintf(fdstream, " <A HREF=\"%s\">%s</A>\n", |
| 488 |
escname, dirbuf->d_name); |
| 489 |
free(escname); |
| 490 |
escname = NULL; |
| 491 |
} |
| 492 |
} |
| 493 |
closedir(request_dir); |
| 494 |
bytes += fprintf(fdstream, "</PRE>\n\n</BODY>\n</HTML>\n"); |
| 495 |
|
| 496 |
fclose(fdstream); |
| 497 |
|
| 498 |
chdir(server_root); |
| 499 |
|
| 500 |
req->filesize = bytes; /* for logging transfer size */ |
| 501 |
return 0; /* success */ |
| 502 |
} |
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