1 #ifndef HEADER_CURL_CFILTERS_H 2 #define HEADER_CURL_CFILTERS_H 3 /*************************************************************************** 4 * _ _ ____ _ 5 * Project ___| | | | _ \| | 6 * / __| | | | |_) | | 7 * | (__| |_| | _ <| |___ 8 * \___|\___/|_| \_\_____| 9 * 10 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 11 * 12 * This software is licensed as described in the file COPYING, which 13 * you should have received as part of this distribution. The terms 14 * are also available at https://curl.se/docs/copyright.html. 15 * 16 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 17 * copies of the Software, and permit persons to whom the Software is 18 * furnished to do so, under the terms of the COPYING file. 19 * 20 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 21 * KIND, either express or implied. 22 * 23 * SPDX-License-Identifier: curl 24 * 25 ***************************************************************************/ 26 27 28 struct Curl_cfilter; 29 struct Curl_easy; 30 struct Curl_dns_entry; 31 struct connectdata; 32 33 /* Callback to destroy resources held by this filter instance. 34 * Implementations MUST NOT chain calls to cf->next. 35 */ 36 typedef void Curl_cft_destroy_this(struct Curl_cfilter *cf, 37 struct Curl_easy *data); 38 39 typedef void Curl_cft_close(struct Curl_cfilter *cf, 40 struct Curl_easy *data); 41 42 typedef CURLcode Curl_cft_connect(struct Curl_cfilter *cf, 43 struct Curl_easy *data, 44 bool blocking, bool *done); 45 46 /* Return the hostname and port the connection goes to. 47 * This may change with the connection state of filters when tunneling 48 * is involved. 49 * @param cf the filter to ask 50 * @param data the easy handle currently active 51 * @param phost on return, points to the relevant, real hostname. 52 * this is owned by the connection. 53 * @param pdisplay_host on return, points to the printable hostname. 54 * this is owned by the connection. 55 * @param pport on return, contains the port number 56 */ 57 typedef void Curl_cft_get_host(struct Curl_cfilter *cf, 58 struct Curl_easy *data, 59 const char **phost, 60 const char **pdisplay_host, 61 int *pport); 62 63 struct easy_pollset; 64 65 /* Passing in an easy_pollset for monitoring of sockets, let 66 * filters add or remove sockets actions (CURL_POLL_OUT, CURL_POLL_IN). 67 * This may add a socket or, in case no actions remain, remove 68 * a socket from the set. 69 * 70 * Filter implementations need to call filters "below" *after* they have 71 * made their adjustments. This allows lower filters to override "upper" 72 * actions. If a "lower" filter is unable to write, it needs to be able 73 * to disallow POLL_OUT. 74 * 75 * A filter without own restrictions/preferences should not modify 76 * the pollset. Filters, whose filter "below" is not connected, should 77 * also do no adjustments. 78 * 79 * Examples: a TLS handshake, while ongoing, might remove POLL_IN 80 * when it needs to write, or vice versa. A HTTP/2 filter might remove 81 * POLL_OUT when a stream window is exhausted and a WINDOW_UPDATE needs 82 * to be received first and add instead POLL_IN. 83 * 84 * @param cf the filter to ask 85 * @param data the easy handle the pollset is about 86 * @param ps the pollset (inout) for the easy handle 87 */ 88 typedef void Curl_cft_adjust_pollset(struct Curl_cfilter *cf, 89 struct Curl_easy *data, 90 struct easy_pollset *ps); 91 92 typedef bool Curl_cft_data_pending(struct Curl_cfilter *cf, 93 const struct Curl_easy *data); 94 95 typedef ssize_t Curl_cft_send(struct Curl_cfilter *cf, 96 struct Curl_easy *data, /* transfer */ 97 const void *buf, /* data to write */ 98 size_t len, /* amount to write */ 99 CURLcode *err); /* error to return */ 100 101 typedef ssize_t Curl_cft_recv(struct Curl_cfilter *cf, 102 struct Curl_easy *data, /* transfer */ 103 char *buf, /* store data here */ 104 size_t len, /* amount to read */ 105 CURLcode *err); /* error to return */ 106 107 typedef bool Curl_cft_conn_is_alive(struct Curl_cfilter *cf, 108 struct Curl_easy *data, 109 bool *input_pending); 110 111 typedef CURLcode Curl_cft_conn_keep_alive(struct Curl_cfilter *cf, 112 struct Curl_easy *data); 113 114 /** 115 * Events/controls for connection filters, their arguments and 116 * return code handling. Filter callbacks are invoked "top down". 117 * Return code handling: 118 * "first fail" meaning that the first filter returning != CURLE_OK, will 119 * abort further event distribution and determine the result. 120 * "ignored" meaning return values are ignored and the event is distributed 121 * to all filters in the chain. Overall result is always CURLE_OK. 122 */ 123 /* data event arg1 arg2 return */ 124 #define CF_CTRL_DATA_ATTACH 1 /* 0 NULL ignored */ 125 #define CF_CTRL_DATA_DETACH 2 /* 0 NULL ignored */ 126 #define CF_CTRL_DATA_SETUP 4 /* 0 NULL first fail */ 127 #define CF_CTRL_DATA_IDLE 5 /* 0 NULL first fail */ 128 #define CF_CTRL_DATA_PAUSE 6 /* on/off NULL first fail */ 129 #define CF_CTRL_DATA_DONE 7 /* premature NULL ignored */ 130 #define CF_CTRL_DATA_DONE_SEND 8 /* 0 NULL ignored */ 131 /* update conn info at connection and data */ 132 #define CF_CTRL_CONN_INFO_UPDATE (256+0) /* 0 NULL ignored */ 133 #define CF_CTRL_FORGET_SOCKET (256+1) /* 0 NULL ignored */ 134 135 /** 136 * Handle event/control for the filter. 137 * Implementations MUST NOT chain calls to cf->next. 138 */ 139 typedef CURLcode Curl_cft_cntrl(struct Curl_cfilter *cf, 140 struct Curl_easy *data, 141 int event, int arg1, void *arg2); 142 143 144 /** 145 * Queries to ask via a `Curl_cft_query *query` method on a cfilter chain. 146 * - MAX_CONCURRENT: the maximum number of parallel transfers the filter 147 * chain expects to handle at the same time. 148 * default: 1 if no filter overrides. 149 * - CONNECT_REPLY_MS: milliseconds until the first indication of a server 150 * response was received on a connect. For TCP, this 151 * reflects the time until the socket connected. On UDP 152 * this gives the time the first bytes from the server 153 * were received. 154 * -1 if not determined yet. 155 * - CF_QUERY_SOCKET: the socket used by the filter chain 156 */ 157 /* query res1 res2 */ 158 #define CF_QUERY_MAX_CONCURRENT 1 /* number - */ 159 #define CF_QUERY_CONNECT_REPLY_MS 2 /* number - */ 160 #define CF_QUERY_SOCKET 3 /* - curl_socket_t */ 161 #define CF_QUERY_TIMER_CONNECT 4 /* - struct curltime */ 162 #define CF_QUERY_TIMER_APPCONNECT 5 /* - struct curltime */ 163 164 /** 165 * Query the cfilter for properties. Filters ignorant of a query will 166 * pass it "down" the filter chain. 167 */ 168 typedef CURLcode Curl_cft_query(struct Curl_cfilter *cf, 169 struct Curl_easy *data, 170 int query, int *pres1, void *pres2); 171 172 /** 173 * Type flags for connection filters. A filter can have none, one or 174 * many of those. Use to evaluate state/capabilities of a filter chain. 175 * 176 * CF_TYPE_IP_CONNECT: provides an IP connection or sth equivalent, like 177 * a CONNECT tunnel, a UNIX domain socket, a QUIC 178 * connection, etc. 179 * CF_TYPE_SSL: provide SSL/TLS 180 * CF_TYPE_MULTIPLEX: provides multiplexing of easy handles 181 */ 182 #define CF_TYPE_IP_CONNECT (1 << 0) 183 #define CF_TYPE_SSL (1 << 1) 184 #define CF_TYPE_MULTIPLEX (1 << 2) 185 186 /* A connection filter type, e.g. specific implementation. */ 187 struct Curl_cftype { 188 const char *name; /* name of the filter type */ 189 int flags; /* flags of filter type */ 190 int log_level; /* log level for such filters */ 191 Curl_cft_destroy_this *destroy; /* destroy resources of this cf */ 192 Curl_cft_connect *do_connect; /* establish connection */ 193 Curl_cft_close *do_close; /* close conn */ 194 Curl_cft_get_host *get_host; /* host filter talks to */ 195 Curl_cft_adjust_pollset *adjust_pollset; /* adjust transfer poll set */ 196 Curl_cft_data_pending *has_data_pending;/* conn has data pending */ 197 Curl_cft_send *do_send; /* send data */ 198 Curl_cft_recv *do_recv; /* receive data */ 199 Curl_cft_cntrl *cntrl; /* events/control */ 200 Curl_cft_conn_is_alive *is_alive; /* FALSE if conn is dead, Jim! */ 201 Curl_cft_conn_keep_alive *keep_alive; /* try to keep it alive */ 202 Curl_cft_query *query; /* query filter chain */ 203 }; 204 205 /* A connection filter instance, e.g. registered at a connection */ 206 struct Curl_cfilter { 207 const struct Curl_cftype *cft; /* the type providing implementation */ 208 struct Curl_cfilter *next; /* next filter in chain */ 209 void *ctx; /* filter type specific settings */ 210 struct connectdata *conn; /* the connection this filter belongs to */ 211 int sockindex; /* the index the filter is installed at */ 212 BIT(connected); /* != 0 iff this filter is connected */ 213 }; 214 215 /* Default implementations for the type functions, implementing nop. */ 216 void Curl_cf_def_destroy_this(struct Curl_cfilter *cf, 217 struct Curl_easy *data); 218 219 /* Default implementations for the type functions, implementing pass-through 220 * the filter chain. */ 221 void Curl_cf_def_get_host(struct Curl_cfilter *cf, struct Curl_easy *data, 222 const char **phost, const char **pdisplay_host, 223 int *pport); 224 void Curl_cf_def_adjust_pollset(struct Curl_cfilter *cf, 225 struct Curl_easy *data, 226 struct easy_pollset *ps); 227 bool Curl_cf_def_data_pending(struct Curl_cfilter *cf, 228 const struct Curl_easy *data); 229 ssize_t Curl_cf_def_send(struct Curl_cfilter *cf, struct Curl_easy *data, 230 const void *buf, size_t len, CURLcode *err); 231 ssize_t Curl_cf_def_recv(struct Curl_cfilter *cf, struct Curl_easy *data, 232 char *buf, size_t len, CURLcode *err); 233 CURLcode Curl_cf_def_cntrl(struct Curl_cfilter *cf, 234 struct Curl_easy *data, 235 int event, int arg1, void *arg2); 236 bool Curl_cf_def_conn_is_alive(struct Curl_cfilter *cf, 237 struct Curl_easy *data, 238 bool *input_pending); 239 CURLcode Curl_cf_def_conn_keep_alive(struct Curl_cfilter *cf, 240 struct Curl_easy *data); 241 CURLcode Curl_cf_def_query(struct Curl_cfilter *cf, 242 struct Curl_easy *data, 243 int query, int *pres1, void *pres2); 244 245 /** 246 * Create a new filter instance, unattached to the filter chain. 247 * Use Curl_conn_cf_add() to add it to the chain. 248 * @param pcf on success holds the created instance 249 * @param cft the filter type 250 * @param ctx the type specific context to use 251 */ 252 CURLcode Curl_cf_create(struct Curl_cfilter **pcf, 253 const struct Curl_cftype *cft, 254 void *ctx); 255 256 /** 257 * Add a filter instance to the `sockindex` filter chain at connection 258 * `conn`. The filter must not already be attached. It is inserted at 259 * the start of the chain (top). 260 */ 261 void Curl_conn_cf_add(struct Curl_easy *data, 262 struct connectdata *conn, 263 int sockindex, 264 struct Curl_cfilter *cf); 265 266 /** 267 * Insert a filter (chain) after `cf_at`. 268 * `cf_new` must not already be attached. 269 */ 270 void Curl_conn_cf_insert_after(struct Curl_cfilter *cf_at, 271 struct Curl_cfilter *cf_new); 272 273 /** 274 * Discard, e.g. remove and destroy `discard` iff 275 * it still is in the filter chain below `cf`. If `discard` 276 * is no longer found beneath `cf` return FALSE. 277 * if `destroy_always` is TRUE, will call `discard`s destroy 278 * function and free it even if not found in the subchain. 279 */ 280 bool Curl_conn_cf_discard_sub(struct Curl_cfilter *cf, 281 struct Curl_cfilter *discard, 282 struct Curl_easy *data, 283 bool destroy_always); 284 285 /** 286 * Discard all cfilters starting with `*pcf` and clearing it afterwards. 287 */ 288 void Curl_conn_cf_discard_chain(struct Curl_cfilter **pcf, 289 struct Curl_easy *data); 290 291 /** 292 * Remove and destroy all filters at chain `sockindex` on connection `conn`. 293 */ 294 void Curl_conn_cf_discard_all(struct Curl_easy *data, 295 struct connectdata *conn, 296 int sockindex); 297 298 299 CURLcode Curl_conn_cf_connect(struct Curl_cfilter *cf, 300 struct Curl_easy *data, 301 bool blocking, bool *done); 302 void Curl_conn_cf_close(struct Curl_cfilter *cf, struct Curl_easy *data); 303 ssize_t Curl_conn_cf_send(struct Curl_cfilter *cf, struct Curl_easy *data, 304 const void *buf, size_t len, CURLcode *err); 305 ssize_t Curl_conn_cf_recv(struct Curl_cfilter *cf, struct Curl_easy *data, 306 char *buf, size_t len, CURLcode *err); 307 CURLcode Curl_conn_cf_cntrl(struct Curl_cfilter *cf, 308 struct Curl_easy *data, 309 bool ignore_result, 310 int event, int arg1, void *arg2); 311 312 /** 313 * Determine if the connection filter chain is using SSL to the remote host 314 * (or will be once connected). 315 */ 316 bool Curl_conn_cf_is_ssl(struct Curl_cfilter *cf); 317 318 /** 319 * Get the socket used by the filter chain starting at `cf`. 320 * Returns CURL_SOCKET_BAD if not available. 321 */ 322 curl_socket_t Curl_conn_cf_get_socket(struct Curl_cfilter *cf, 323 struct Curl_easy *data); 324 325 326 #define CURL_CF_SSL_DEFAULT -1 327 #define CURL_CF_SSL_DISABLE 0 328 #define CURL_CF_SSL_ENABLE 1 329 330 /** 331 * Bring the filter chain at `sockindex` for connection `data->conn` into 332 * connected state. Which will set `*done` to TRUE. 333 * This can be called on an already connected chain with no side effects. 334 * When not `blocking`, calls may return without error and `*done != TRUE`, 335 * while the individual filters negotiated the connection. 336 */ 337 CURLcode Curl_conn_connect(struct Curl_easy *data, int sockindex, 338 bool blocking, bool *done); 339 340 /** 341 * Check if the filter chain at `sockindex` for connection `conn` is 342 * completely connected. 343 */ 344 bool Curl_conn_is_connected(struct connectdata *conn, int sockindex); 345 346 /** 347 * Determine if we have reached the remote host on IP level, e.g. 348 * have a TCP connection. This turns TRUE before a possible SSL 349 * handshake has been started/done. 350 */ 351 bool Curl_conn_is_ip_connected(struct Curl_easy *data, int sockindex); 352 353 /** 354 * Determine if the connection is using SSL to the remote host 355 * (or will be once connected). This will return FALSE, if SSL 356 * is only used in proxying and not for the tunnel itself. 357 */ 358 bool Curl_conn_is_ssl(struct connectdata *conn, int sockindex); 359 360 /** 361 * Connection provides multiplexing of easy handles at `socketindex`. 362 */ 363 bool Curl_conn_is_multiplex(struct connectdata *conn, int sockindex); 364 365 /** 366 * Close the filter chain at `sockindex` for connection `data->conn`. 367 * Filters remain in place and may be connected again afterwards. 368 */ 369 void Curl_conn_close(struct Curl_easy *data, int sockindex); 370 371 /** 372 * Return if data is pending in some connection filter at chain 373 * `sockindex` for connection `data->conn`. 374 */ 375 bool Curl_conn_data_pending(struct Curl_easy *data, 376 int sockindex); 377 378 /** 379 * Return the socket used on data's connection for the index. 380 * Returns CURL_SOCKET_BAD if not available. 381 */ 382 curl_socket_t Curl_conn_get_socket(struct Curl_easy *data, int sockindex); 383 384 /** 385 * Tell filters to forget about the socket at sockindex. 386 */ 387 void Curl_conn_forget_socket(struct Curl_easy *data, int sockindex); 388 389 /** 390 * Adjust the pollset for the filter chain startgin at `cf`. 391 */ 392 void Curl_conn_cf_adjust_pollset(struct Curl_cfilter *cf, 393 struct Curl_easy *data, 394 struct easy_pollset *ps); 395 396 /** 397 * Adjust pollset from filters installed at transfer's connection. 398 */ 399 void Curl_conn_adjust_pollset(struct Curl_easy *data, 400 struct easy_pollset *ps); 401 402 /** 403 * Receive data through the filter chain at `sockindex` for connection 404 * `data->conn`. Copy at most `len` bytes into `buf`. Return the 405 * actuel number of bytes copied or a negative value on error. 406 * The error code is placed into `*code`. 407 */ 408 ssize_t Curl_conn_recv(struct Curl_easy *data, int sockindex, char *buf, 409 size_t len, CURLcode *code); 410 411 /** 412 * Send `len` bytes of data from `buf` through the filter chain `sockindex` 413 * at connection `data->conn`. Return the actual number of bytes written 414 * or a negative value on error. 415 * The error code is placed into `*code`. 416 */ 417 ssize_t Curl_conn_send(struct Curl_easy *data, int sockindex, 418 const void *buf, size_t len, CURLcode *code); 419 420 /** 421 * The easy handle `data` is being attached to `conn`. This does 422 * not mean that data will actually do a transfer. Attachment is 423 * also used for temporary actions on the connection. 424 */ 425 void Curl_conn_ev_data_attach(struct connectdata *conn, 426 struct Curl_easy *data); 427 428 /** 429 * The easy handle `data` is being detached (no longer served) 430 * by connection `conn`. All filters are informed to release any resources 431 * related to `data`. 432 * Note: there may be several `data` attached to a connection at the same 433 * time. 434 */ 435 void Curl_conn_ev_data_detach(struct connectdata *conn, 436 struct Curl_easy *data); 437 438 /** 439 * Notify connection filters that they need to setup data for 440 * a transfer. 441 */ 442 CURLcode Curl_conn_ev_data_setup(struct Curl_easy *data); 443 444 /** 445 * Notify connection filters that now would be a good time to 446 * perform any idle, e.g. time related, actions. 447 */ 448 CURLcode Curl_conn_ev_data_idle(struct Curl_easy *data); 449 450 /** 451 * Notify connection filters that the transfer represented by `data` 452 * is donw with sending data (e.g. has uploaded everything). 453 */ 454 void Curl_conn_ev_data_done_send(struct Curl_easy *data); 455 456 /** 457 * Notify connection filters that the transfer represented by `data` 458 * is finished - eventually premature, e.g. before being complete. 459 */ 460 void Curl_conn_ev_data_done(struct Curl_easy *data, bool premature); 461 462 /** 463 * Notify connection filters that the transfer of data is paused/unpaused. 464 */ 465 CURLcode Curl_conn_ev_data_pause(struct Curl_easy *data, bool do_pause); 466 467 /** 468 * Inform connection filters to update their info in `conn`. 469 */ 470 void Curl_conn_ev_update_info(struct Curl_easy *data, 471 struct connectdata *conn); 472 473 /** 474 * Check if FIRSTSOCKET's cfilter chain deems connection alive. 475 */ 476 bool Curl_conn_is_alive(struct Curl_easy *data, struct connectdata *conn, 477 bool *input_pending); 478 479 /** 480 * Try to upkeep the connection filters at sockindex. 481 */ 482 CURLcode Curl_conn_keep_alive(struct Curl_easy *data, 483 struct connectdata *conn, 484 int sockindex); 485 486 void Curl_cf_def_close(struct Curl_cfilter *cf, struct Curl_easy *data); 487 void Curl_conn_get_host(struct Curl_easy *data, int sockindex, 488 const char **phost, const char **pdisplay_host, 489 int *pport); 490 491 /** 492 * Get the maximum number of parallel transfers the connection 493 * expects to be able to handle at `sockindex`. 494 */ 495 size_t Curl_conn_get_max_concurrent(struct Curl_easy *data, 496 struct connectdata *conn, 497 int sockindex); 498 499 500 void Curl_pollset_reset(struct Curl_easy *data, 501 struct easy_pollset *ps); 502 503 /* Change the poll flags (CURL_POLL_IN/CURL_POLL_OUT) to the poll set for 504 * socket `sock`. If the socket is not already part of the poll set, it 505 * will be added. 506 * If the socket is present and all poll flags are cleared, it will be removed. 507 */ 508 void Curl_pollset_change(struct Curl_easy *data, 509 struct easy_pollset *ps, curl_socket_t sock, 510 int add_flags, int remove_flags); 511 512 void Curl_pollset_set(struct Curl_easy *data, 513 struct easy_pollset *ps, curl_socket_t sock, 514 bool do_in, bool do_out); 515 516 #define Curl_pollset_add_in(data, ps, sock) \ 517 Curl_pollset_change((data), (ps), (sock), CURL_POLL_IN, 0) 518 #define Curl_pollset_add_out(data, ps, sock) \ 519 Curl_pollset_change((data), (ps), (sock), CURL_POLL_OUT, 0) 520 #define Curl_pollset_add_inout(data, ps, sock) \ 521 Curl_pollset_change((data), (ps), (sock), \ 522 CURL_POLL_IN|CURL_POLL_OUT, 0) 523 #define Curl_pollset_set_in_only(data, ps, sock) \ 524 Curl_pollset_change((data), (ps), (sock), \ 525 CURL_POLL_IN, CURL_POLL_OUT) 526 #define Curl_pollset_set_out_only(data, ps, sock) \ 527 Curl_pollset_change((data), (ps), (sock), \ 528 CURL_POLL_OUT, CURL_POLL_IN) 529 530 void Curl_pollset_add_socks(struct Curl_easy *data, 531 struct easy_pollset *ps, 532 int (*get_socks_cb)(struct Curl_easy *data, 533 curl_socket_t *socks)); 534 535 /** 536 * Check if the pollset, as is, wants to read and/or write regarding 537 * the given socket. 538 */ 539 void Curl_pollset_check(struct Curl_easy *data, 540 struct easy_pollset *ps, curl_socket_t sock, 541 bool *pwant_read, bool *pwant_write); 542 543 /** 544 * Types and macros used to keep the current easy handle in filter calls, 545 * allowing for nested invocations. See #10336. 546 * 547 * `cf_call_data` is intended to be a member of the cfilter's `ctx` type. 548 * A filter defines the macro `CF_CTX_CALL_DATA` to give access to that. 549 * 550 * With all values 0, the default, this indicates that there is no cfilter 551 * call with `data` ongoing. 552 * Macro `CF_DATA_SAVE` preserves the current `cf_call_data` in a local 553 * variable and sets the `data` given, incrementing the `depth` counter. 554 * 555 * Macro `CF_DATA_RESTORE` restores the old values from the local variable, 556 * while checking that `depth` values are as expected (debug build), catching 557 * cases where a "lower" RESTORE was not called. 558 * 559 * Finally, macro `CF_DATA_CURRENT` gives the easy handle of the current 560 * invocation. 561 */ 562 struct cf_call_data { 563 struct Curl_easy *data; 564 #ifdef DEBUGBUILD 565 int depth; 566 #endif 567 }; 568 569 /** 570 * define to access the `struct cf_call_data for a cfilter. Normally 571 * a member in the cfilter's `ctx`. 572 * 573 * #define CF_CTX_CALL_DATA(cf) -> struct cf_call_data instance 574 */ 575 576 #ifdef DEBUGBUILD 577 578 #define CF_DATA_SAVE(save, cf, data) \ 579 do { \ 580 (save) = CF_CTX_CALL_DATA(cf); \ 581 DEBUGASSERT((save).data == NULL || (save).depth > 0); \ 582 CF_CTX_CALL_DATA(cf).depth++; \ 583 CF_CTX_CALL_DATA(cf).data = (struct Curl_easy *)data; \ 584 } while(0) 585 586 #define CF_DATA_RESTORE(cf, save) \ 587 do { \ 588 DEBUGASSERT(CF_CTX_CALL_DATA(cf).depth == (save).depth + 1); \ 589 DEBUGASSERT((save).data == NULL || (save).depth > 0); \ 590 CF_CTX_CALL_DATA(cf) = (save); \ 591 } while(0) 592 593 #else /* DEBUGBUILD */ 594 595 #define CF_DATA_SAVE(save, cf, data) \ 596 do { \ 597 (save) = CF_CTX_CALL_DATA(cf); \ 598 CF_CTX_CALL_DATA(cf).data = (struct Curl_easy *)data; \ 599 } while(0) 600 601 #define CF_DATA_RESTORE(cf, save) \ 602 do { \ 603 CF_CTX_CALL_DATA(cf) = (save); \ 604 } while(0) 605 606 #endif /* !DEBUGBUILD */ 607 608 #define CF_DATA_CURRENT(cf) \ 609 ((cf)? (CF_CTX_CALL_DATA(cf).data) : NULL) 610 611 #endif /* HEADER_CURL_CFILTERS_H */ 612