/proc/self/cwd/external/curl/lib/sendf.c
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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 | | #ifdef HAVE_NETINET_IN_H |
28 | | #include <netinet/in.h> |
29 | | #endif |
30 | | |
31 | | #ifdef HAVE_LINUX_TCP_H |
32 | | #include <linux/tcp.h> |
33 | | #elif defined(HAVE_NETINET_TCP_H) |
34 | | #include <netinet/tcp.h> |
35 | | #endif |
36 | | |
37 | | #include <curl/curl.h> |
38 | | |
39 | | #include "urldata.h" |
40 | | #include "sendf.h" |
41 | | #include "cfilters.h" |
42 | | #include "connect.h" |
43 | | #include "content_encoding.h" |
44 | | #include "vtls/vtls.h" |
45 | | #include "vssh/ssh.h" |
46 | | #include "easyif.h" |
47 | | #include "multiif.h" |
48 | | #include "strerror.h" |
49 | | #include "select.h" |
50 | | #include "strdup.h" |
51 | | #include "http2.h" |
52 | | #include "headers.h" |
53 | | #include "ws.h" |
54 | | |
55 | | /* The last 3 #include files should be in this order */ |
56 | | #include "curl_printf.h" |
57 | | #include "curl_memory.h" |
58 | | #include "memdebug.h" |
59 | | |
60 | | #if defined(CURL_DO_LINEEND_CONV) && !defined(CURL_DISABLE_FTP) |
61 | | /* |
62 | | * convert_lineends() changes CRLF (\r\n) end-of-line markers to a single LF |
63 | | * (\n), with special processing for CRLF sequences that are split between two |
64 | | * blocks of data. Remaining, bare CRs are changed to LFs. The possibly new |
65 | | * size of the data is returned. |
66 | | */ |
67 | | static size_t convert_lineends(struct Curl_easy *data, |
68 | | char *startPtr, size_t size) |
69 | | { |
70 | | char *inPtr, *outPtr; |
71 | | |
72 | | /* sanity check */ |
73 | | if(!startPtr || (size < 1)) { |
74 | | return size; |
75 | | } |
76 | | |
77 | | if(data->state.prev_block_had_trailing_cr) { |
78 | | /* The previous block of incoming data |
79 | | had a trailing CR, which was turned into a LF. */ |
80 | | if(*startPtr == '\n') { |
81 | | /* This block of incoming data starts with the |
82 | | previous block's LF so get rid of it */ |
83 | | memmove(startPtr, startPtr + 1, size-1); |
84 | | size--; |
85 | | /* and it wasn't a bare CR but a CRLF conversion instead */ |
86 | | data->state.crlf_conversions++; |
87 | | } |
88 | | data->state.prev_block_had_trailing_cr = FALSE; /* reset the flag */ |
89 | | } |
90 | | |
91 | | /* find 1st CR, if any */ |
92 | | inPtr = outPtr = memchr(startPtr, '\r', size); |
93 | | if(inPtr) { |
94 | | /* at least one CR, now look for CRLF */ |
95 | | while(inPtr < (startPtr + size-1)) { |
96 | | /* note that it's size-1, so we'll never look past the last byte */ |
97 | | if(memcmp(inPtr, "\r\n", 2) == 0) { |
98 | | /* CRLF found, bump past the CR and copy the NL */ |
99 | | inPtr++; |
100 | | *outPtr = *inPtr; |
101 | | /* keep track of how many CRLFs we converted */ |
102 | | data->state.crlf_conversions++; |
103 | | } |
104 | | else { |
105 | | if(*inPtr == '\r') { |
106 | | /* lone CR, move LF instead */ |
107 | | *outPtr = '\n'; |
108 | | } |
109 | | else { |
110 | | /* not a CRLF nor a CR, just copy whatever it is */ |
111 | | *outPtr = *inPtr; |
112 | | } |
113 | | } |
114 | | outPtr++; |
115 | | inPtr++; |
116 | | } /* end of while loop */ |
117 | | |
118 | | if(inPtr < startPtr + size) { |
119 | | /* handle last byte */ |
120 | | if(*inPtr == '\r') { |
121 | | /* deal with a CR at the end of the buffer */ |
122 | | *outPtr = '\n'; /* copy a NL instead */ |
123 | | /* note that a CRLF might be split across two blocks */ |
124 | | data->state.prev_block_had_trailing_cr = TRUE; |
125 | | } |
126 | | else { |
127 | | /* copy last byte */ |
128 | | *outPtr = *inPtr; |
129 | | } |
130 | | outPtr++; |
131 | | } |
132 | | if(outPtr < startPtr + size) |
133 | | /* tidy up by null terminating the now shorter data */ |
134 | | *outPtr = '\0'; |
135 | | |
136 | | return (outPtr - startPtr); |
137 | | } |
138 | | return size; |
139 | | } |
140 | | #endif /* CURL_DO_LINEEND_CONV && !CURL_DISABLE_FTP */ |
141 | | |
142 | | /* |
143 | | * Curl_nwrite() is an internal write function that sends data to the |
144 | | * server. Works with a socket index for the connection. |
145 | | * |
146 | | * If the write would block (CURLE_AGAIN), it returns CURLE_OK and |
147 | | * (*nwritten == 0). Otherwise we return regular CURLcode value. |
148 | | */ |
149 | | CURLcode Curl_nwrite(struct Curl_easy *data, |
150 | | int sockindex, |
151 | | const void *buf, |
152 | | size_t blen, |
153 | | ssize_t *pnwritten) |
154 | 0 | { |
155 | 0 | ssize_t nwritten; |
156 | 0 | CURLcode result = CURLE_OK; |
157 | 0 | struct connectdata *conn; |
158 | |
|
159 | 0 | DEBUGASSERT(sockindex >= 0 && sockindex < 2); |
160 | 0 | DEBUGASSERT(pnwritten); |
161 | 0 | DEBUGASSERT(data); |
162 | 0 | DEBUGASSERT(data->conn); |
163 | 0 | conn = data->conn; |
164 | | #ifdef CURLDEBUG |
165 | | { |
166 | | /* Allow debug builds to override this logic to force short sends |
167 | | */ |
168 | | char *p = getenv("CURL_SMALLSENDS"); |
169 | | if(p) { |
170 | | size_t altsize = (size_t)strtoul(p, NULL, 10); |
171 | | if(altsize) |
172 | | blen = CURLMIN(blen, altsize); |
173 | | } |
174 | | } |
175 | | #endif |
176 | 0 | nwritten = conn->send[sockindex](data, sockindex, buf, blen, &result); |
177 | 0 | if(result == CURLE_AGAIN) { |
178 | 0 | nwritten = 0; |
179 | 0 | result = CURLE_OK; |
180 | 0 | } |
181 | 0 | else if(result) { |
182 | 0 | nwritten = -1; /* make sure */ |
183 | 0 | } |
184 | 0 | else { |
185 | 0 | DEBUGASSERT(nwritten >= 0); |
186 | 0 | } |
187 | |
|
188 | 0 | *pnwritten = nwritten; |
189 | 0 | return result; |
190 | 0 | } |
191 | | |
192 | | /* |
193 | | * Curl_write() is an internal write function that sends data to the |
194 | | * server. Works with plain sockets, SCP, SSL or kerberos. |
195 | | * |
196 | | * If the write would block (CURLE_AGAIN), we return CURLE_OK and |
197 | | * (*written == 0). Otherwise we return regular CURLcode value. |
198 | | */ |
199 | | CURLcode Curl_write(struct Curl_easy *data, |
200 | | curl_socket_t sockfd, |
201 | | const void *mem, |
202 | | size_t len, |
203 | | ssize_t *written) |
204 | 0 | { |
205 | 0 | struct connectdata *conn; |
206 | 0 | int num; |
207 | |
|
208 | 0 | DEBUGASSERT(data); |
209 | 0 | DEBUGASSERT(data->conn); |
210 | 0 | conn = data->conn; |
211 | 0 | num = (sockfd != CURL_SOCKET_BAD && sockfd == conn->sock[SECONDARYSOCKET]); |
212 | 0 | return Curl_nwrite(data, num, mem, len, written); |
213 | 0 | } |
214 | | |
215 | | static CURLcode pausewrite(struct Curl_easy *data, |
216 | | int type, /* what type of data */ |
217 | | bool paused_body, |
218 | | const char *ptr, |
219 | | size_t len) |
220 | 0 | { |
221 | | /* signalled to pause sending on this connection, but since we have data |
222 | | we want to send we need to dup it to save a copy for when the sending |
223 | | is again enabled */ |
224 | 0 | struct SingleRequest *k = &data->req; |
225 | 0 | struct UrlState *s = &data->state; |
226 | 0 | unsigned int i; |
227 | 0 | bool newtype = TRUE; |
228 | |
|
229 | 0 | Curl_conn_ev_data_pause(data, TRUE); |
230 | |
|
231 | 0 | if(s->tempcount) { |
232 | 0 | for(i = 0; i< s->tempcount; i++) { |
233 | 0 | if(s->tempwrite[i].type == type && |
234 | 0 | !!s->tempwrite[i].paused_body == !!paused_body) { |
235 | | /* data for this type exists */ |
236 | 0 | newtype = FALSE; |
237 | 0 | break; |
238 | 0 | } |
239 | 0 | } |
240 | 0 | DEBUGASSERT(i < 3); |
241 | 0 | if(i >= 3) |
242 | | /* There are more types to store than what fits: very bad */ |
243 | 0 | return CURLE_OUT_OF_MEMORY; |
244 | 0 | } |
245 | 0 | else |
246 | 0 | i = 0; |
247 | | |
248 | 0 | if(newtype) { |
249 | | /* store this information in the state struct for later use */ |
250 | 0 | Curl_dyn_init(&s->tempwrite[i].b, DYN_PAUSE_BUFFER); |
251 | 0 | s->tempwrite[i].type = type; |
252 | 0 | s->tempwrite[i].paused_body = paused_body; |
253 | 0 | s->tempcount++; |
254 | 0 | } |
255 | |
|
256 | 0 | if(Curl_dyn_addn(&s->tempwrite[i].b, (unsigned char *)ptr, len)) |
257 | 0 | return CURLE_OUT_OF_MEMORY; |
258 | | |
259 | | /* mark the connection as RECV paused */ |
260 | 0 | k->keepon |= KEEP_RECV_PAUSE; |
261 | |
|
262 | 0 | return CURLE_OK; |
263 | 0 | } |
264 | | |
265 | | |
266 | | /* chop_write() writes chunks of data not larger than CURL_MAX_WRITE_SIZE via |
267 | | * client write callback(s) and takes care of pause requests from the |
268 | | * callbacks. |
269 | | */ |
270 | | static CURLcode chop_write(struct Curl_easy *data, |
271 | | int type, |
272 | | bool skip_body_write, |
273 | | char *optr, |
274 | | size_t olen) |
275 | 0 | { |
276 | 0 | struct connectdata *conn = data->conn; |
277 | 0 | curl_write_callback writeheader = NULL; |
278 | 0 | curl_write_callback writebody = NULL; |
279 | 0 | char *ptr = optr; |
280 | 0 | size_t len = olen; |
281 | 0 | void *writebody_ptr = data->set.out; |
282 | |
|
283 | 0 | if(!len) |
284 | 0 | return CURLE_OK; |
285 | | |
286 | | /* If reading is paused, append this data to the already held data for this |
287 | | type. */ |
288 | 0 | if(data->req.keepon & KEEP_RECV_PAUSE) |
289 | 0 | return pausewrite(data, type, !skip_body_write, ptr, len); |
290 | | |
291 | | /* Determine the callback(s) to use. */ |
292 | 0 | if(!skip_body_write && |
293 | 0 | ((type & CLIENTWRITE_BODY) || |
294 | 0 | ((type & CLIENTWRITE_HEADER) && data->set.include_header))) { |
295 | | #ifdef USE_WEBSOCKETS |
296 | | if(conn->handler->protocol & (CURLPROTO_WS|CURLPROTO_WSS)) { |
297 | | writebody = Curl_ws_writecb; |
298 | | writebody_ptr = data; |
299 | | } |
300 | | else |
301 | | #endif |
302 | 0 | writebody = data->set.fwrite_func; |
303 | 0 | } |
304 | 0 | if((type & (CLIENTWRITE_HEADER|CLIENTWRITE_INFO)) && |
305 | 0 | (data->set.fwrite_header || data->set.writeheader)) { |
306 | | /* |
307 | | * Write headers to the same callback or to the especially setup |
308 | | * header callback function (added after version 7.7.1). |
309 | | */ |
310 | 0 | writeheader = |
311 | 0 | data->set.fwrite_header? data->set.fwrite_header: data->set.fwrite_func; |
312 | 0 | } |
313 | | |
314 | | /* Chop data, write chunks. */ |
315 | 0 | while(len) { |
316 | 0 | size_t chunklen = len <= CURL_MAX_WRITE_SIZE? len: CURL_MAX_WRITE_SIZE; |
317 | |
|
318 | 0 | if(writebody) { |
319 | 0 | size_t wrote; |
320 | 0 | Curl_set_in_callback(data, true); |
321 | 0 | wrote = writebody(ptr, 1, chunklen, writebody_ptr); |
322 | 0 | Curl_set_in_callback(data, false); |
323 | |
|
324 | 0 | if(CURL_WRITEFUNC_PAUSE == wrote) { |
325 | 0 | if(conn->handler->flags & PROTOPT_NONETWORK) { |
326 | | /* Protocols that work without network cannot be paused. This is |
327 | | actually only FILE:// just now, and it can't pause since the |
328 | | transfer isn't done using the "normal" procedure. */ |
329 | 0 | failf(data, "Write callback asked for PAUSE when not supported"); |
330 | 0 | return CURLE_WRITE_ERROR; |
331 | 0 | } |
332 | 0 | return pausewrite(data, type, TRUE, ptr, len); |
333 | 0 | } |
334 | 0 | if(wrote != chunklen) { |
335 | 0 | failf(data, "Failure writing output to destination"); |
336 | 0 | return CURLE_WRITE_ERROR; |
337 | 0 | } |
338 | 0 | } |
339 | | |
340 | 0 | ptr += chunklen; |
341 | 0 | len -= chunklen; |
342 | 0 | } |
343 | | |
344 | 0 | #ifndef CURL_DISABLE_HTTP |
345 | | /* HTTP header, but not status-line */ |
346 | 0 | if((conn->handler->protocol & PROTO_FAMILY_HTTP) && |
347 | 0 | (type & CLIENTWRITE_HEADER) && !(type & CLIENTWRITE_STATUS) ) { |
348 | 0 | unsigned char htype = (unsigned char) |
349 | 0 | (type & CLIENTWRITE_CONNECT ? CURLH_CONNECT : |
350 | 0 | (type & CLIENTWRITE_1XX ? CURLH_1XX : |
351 | 0 | (type & CLIENTWRITE_TRAILER ? CURLH_TRAILER : |
352 | 0 | CURLH_HEADER))); |
353 | 0 | CURLcode result = Curl_headers_push(data, optr, htype); |
354 | 0 | if(result) |
355 | 0 | return result; |
356 | 0 | } |
357 | 0 | #endif |
358 | | |
359 | 0 | if(writeheader) { |
360 | 0 | size_t wrote; |
361 | |
|
362 | 0 | Curl_set_in_callback(data, true); |
363 | 0 | wrote = writeheader(optr, 1, olen, data->set.writeheader); |
364 | 0 | Curl_set_in_callback(data, false); |
365 | |
|
366 | 0 | if(CURL_WRITEFUNC_PAUSE == wrote) |
367 | 0 | return pausewrite(data, type, FALSE, optr, olen); |
368 | 0 | if(wrote != olen) { |
369 | 0 | failf(data, "Failed writing header"); |
370 | 0 | return CURLE_WRITE_ERROR; |
371 | 0 | } |
372 | 0 | } |
373 | | |
374 | 0 | return CURLE_OK; |
375 | 0 | } |
376 | | |
377 | | |
378 | | /* Curl_client_write() sends data to the write callback(s) |
379 | | |
380 | | The bit pattern defines to what "streams" to write to. Body and/or header. |
381 | | The defines are in sendf.h of course. |
382 | | |
383 | | If CURL_DO_LINEEND_CONV is enabled, data is converted IN PLACE to the |
384 | | local character encoding. This is a problem and should be changed in |
385 | | the future to leave the original data alone. |
386 | | */ |
387 | | CURLcode Curl_client_write(struct Curl_easy *data, |
388 | | int type, |
389 | | char *ptr, |
390 | | size_t len) |
391 | 0 | { |
392 | | #if !defined(CURL_DISABLE_FTP) && defined(CURL_DO_LINEEND_CONV) |
393 | | /* FTP data may need conversion. */ |
394 | | if((type & CLIENTWRITE_BODY) && |
395 | | (data->conn->handler->protocol & PROTO_FAMILY_FTP) && |
396 | | data->conn->proto.ftpc.transfertype == 'A') { |
397 | | /* convert end-of-line markers */ |
398 | | len = convert_lineends(data, ptr, len); |
399 | | } |
400 | | #endif |
401 | | /* it is one of those, at least */ |
402 | 0 | DEBUGASSERT(type & (CLIENTWRITE_BODY|CLIENTWRITE_HEADER|CLIENTWRITE_INFO)); |
403 | | /* BODY is only BODY */ |
404 | 0 | DEBUGASSERT(!(type & CLIENTWRITE_BODY) || (type == CLIENTWRITE_BODY)); |
405 | | /* INFO is only INFO */ |
406 | 0 | DEBUGASSERT(!(type & CLIENTWRITE_INFO) || (type == CLIENTWRITE_INFO)); |
407 | |
|
408 | 0 | if(type == CLIENTWRITE_BODY) { |
409 | 0 | if(data->req.ignorebody) |
410 | 0 | return CURLE_OK; |
411 | | |
412 | 0 | if(data->req.writer_stack && !data->set.http_ce_skip) |
413 | 0 | return Curl_unencode_write(data, data->req.writer_stack, ptr, len); |
414 | 0 | } |
415 | 0 | return chop_write(data, type, FALSE, ptr, len); |
416 | 0 | } |
417 | | |
418 | | CURLcode Curl_client_unpause(struct Curl_easy *data) |
419 | 0 | { |
420 | 0 | CURLcode result = CURLE_OK; |
421 | |
|
422 | 0 | if(data->state.tempcount) { |
423 | | /* there are buffers for sending that can be delivered as the receive |
424 | | pausing is lifted! */ |
425 | 0 | unsigned int i; |
426 | 0 | unsigned int count = data->state.tempcount; |
427 | 0 | struct tempbuf writebuf[3]; /* there can only be three */ |
428 | | |
429 | | /* copy the structs to allow for immediate re-pausing */ |
430 | 0 | for(i = 0; i < data->state.tempcount; i++) { |
431 | 0 | writebuf[i] = data->state.tempwrite[i]; |
432 | 0 | Curl_dyn_init(&data->state.tempwrite[i].b, DYN_PAUSE_BUFFER); |
433 | 0 | } |
434 | 0 | data->state.tempcount = 0; |
435 | |
|
436 | 0 | for(i = 0; i < count; i++) { |
437 | | /* even if one function returns error, this loops through and frees |
438 | | all buffers */ |
439 | 0 | if(!result) |
440 | 0 | result = chop_write(data, writebuf[i].type, |
441 | 0 | !writebuf[i].paused_body, |
442 | 0 | Curl_dyn_ptr(&writebuf[i].b), |
443 | 0 | Curl_dyn_len(&writebuf[i].b)); |
444 | 0 | Curl_dyn_free(&writebuf[i].b); |
445 | 0 | } |
446 | 0 | } |
447 | 0 | return result; |
448 | 0 | } |
449 | | |
450 | | void Curl_client_cleanup(struct Curl_easy *data) |
451 | 0 | { |
452 | 0 | struct contenc_writer *writer = data->req.writer_stack; |
453 | 0 | size_t i; |
454 | |
|
455 | 0 | while(writer) { |
456 | 0 | data->req.writer_stack = writer->downstream; |
457 | 0 | writer->handler->close_writer(data, writer); |
458 | 0 | free(writer); |
459 | 0 | writer = data->req.writer_stack; |
460 | 0 | } |
461 | |
|
462 | 0 | for(i = 0; i < data->state.tempcount; i++) { |
463 | 0 | Curl_dyn_free(&data->state.tempwrite[i].b); |
464 | 0 | } |
465 | 0 | data->state.tempcount = 0; |
466 | |
|
467 | 0 | } |
468 | | |
469 | | /* Real client writer: no downstream. */ |
470 | | static CURLcode client_cew_init(struct Curl_easy *data, |
471 | | struct contenc_writer *writer) |
472 | 0 | { |
473 | 0 | (void) data; |
474 | 0 | (void)writer; |
475 | 0 | return CURLE_OK; |
476 | 0 | } |
477 | | |
478 | | static CURLcode client_cew_write(struct Curl_easy *data, |
479 | | struct contenc_writer *writer, |
480 | | const char *buf, size_t nbytes) |
481 | 0 | { |
482 | 0 | (void)writer; |
483 | 0 | if(!nbytes || data->req.ignorebody) |
484 | 0 | return CURLE_OK; |
485 | 0 | return chop_write(data, CLIENTWRITE_BODY, FALSE, (char *)buf, nbytes); |
486 | 0 | } |
487 | | |
488 | | static void client_cew_close(struct Curl_easy *data, |
489 | | struct contenc_writer *writer) |
490 | 0 | { |
491 | 0 | (void) data; |
492 | 0 | (void) writer; |
493 | 0 | } |
494 | | |
495 | | static const struct content_encoding client_cew = { |
496 | | NULL, |
497 | | NULL, |
498 | | client_cew_init, |
499 | | client_cew_write, |
500 | | client_cew_close, |
501 | | sizeof(struct contenc_writer) |
502 | | }; |
503 | | |
504 | | /* Create an unencoding writer stage using the given handler. */ |
505 | | CURLcode Curl_client_create_writer(struct contenc_writer **pwriter, |
506 | | struct Curl_easy *data, |
507 | | const struct content_encoding *ce_handler, |
508 | | int order) |
509 | 0 | { |
510 | 0 | struct contenc_writer *writer; |
511 | 0 | CURLcode result = CURLE_OUT_OF_MEMORY; |
512 | |
|
513 | 0 | DEBUGASSERT(ce_handler->writersize >= sizeof(struct contenc_writer)); |
514 | 0 | writer = (struct contenc_writer *) calloc(1, ce_handler->writersize); |
515 | 0 | if(!writer) |
516 | 0 | goto out; |
517 | | |
518 | 0 | writer->handler = ce_handler; |
519 | 0 | writer->order = order; |
520 | 0 | result = ce_handler->init_writer(data, writer); |
521 | |
|
522 | 0 | out: |
523 | 0 | *pwriter = result? NULL : writer; |
524 | 0 | if(result) |
525 | 0 | free(writer); |
526 | 0 | return result; |
527 | 0 | } |
528 | | |
529 | | void Curl_client_free_writer(struct Curl_easy *data, |
530 | | struct contenc_writer *writer) |
531 | 0 | { |
532 | 0 | if(writer) { |
533 | 0 | writer->handler->close_writer(data, writer); |
534 | 0 | free(writer); |
535 | 0 | } |
536 | 0 | } |
537 | | |
538 | | /* allow no more than 5 "chained" compression steps */ |
539 | 0 | #define MAX_ENCODE_STACK 5 |
540 | | |
541 | | |
542 | | static CURLcode init_writer_stack(struct Curl_easy *data) |
543 | 0 | { |
544 | 0 | DEBUGASSERT(!data->req.writer_stack); |
545 | 0 | return Curl_client_create_writer(&data->req.writer_stack, |
546 | 0 | data, &client_cew, 0); |
547 | 0 | } |
548 | | |
549 | | CURLcode Curl_client_add_writer(struct Curl_easy *data, |
550 | | struct contenc_writer *writer) |
551 | 0 | { |
552 | 0 | CURLcode result; |
553 | |
|
554 | 0 | if(!data->req.writer_stack) { |
555 | 0 | result = init_writer_stack(data); |
556 | 0 | if(result) |
557 | 0 | return result; |
558 | 0 | } |
559 | | |
560 | 0 | if(data->req.writer_stack_depth++ >= MAX_ENCODE_STACK) { |
561 | 0 | failf(data, "Reject response due to more than %u content encodings", |
562 | 0 | MAX_ENCODE_STACK); |
563 | 0 | return CURLE_BAD_CONTENT_ENCODING; |
564 | 0 | } |
565 | | |
566 | | /* Stack the unencoding stage. */ |
567 | 0 | if(writer->order >= data->req.writer_stack->order) { |
568 | 0 | writer->downstream = data->req.writer_stack; |
569 | 0 | data->req.writer_stack = writer; |
570 | 0 | } |
571 | 0 | else { |
572 | 0 | struct contenc_writer *w = data->req.writer_stack; |
573 | 0 | while(w->downstream && writer->order < w->downstream->order) |
574 | 0 | w = w->downstream; |
575 | 0 | writer->downstream = w->downstream; |
576 | 0 | w->downstream = writer; |
577 | 0 | } |
578 | 0 | return CURLE_OK; |
579 | 0 | } |
580 | | |
581 | | |
582 | | /* |
583 | | * Internal read-from-socket function. This is meant to deal with plain |
584 | | * sockets, SSL sockets and kerberos sockets. |
585 | | * |
586 | | * Returns a regular CURLcode value. |
587 | | */ |
588 | | CURLcode Curl_read(struct Curl_easy *data, /* transfer */ |
589 | | curl_socket_t sockfd, /* read from this socket */ |
590 | | char *buf, /* store read data here */ |
591 | | size_t sizerequested, /* max amount to read */ |
592 | | ssize_t *n) /* amount bytes read */ |
593 | 0 | { |
594 | 0 | CURLcode result = CURLE_RECV_ERROR; |
595 | 0 | ssize_t nread = 0; |
596 | 0 | size_t bytesfromsocket = 0; |
597 | 0 | char *buffertofill = NULL; |
598 | 0 | struct connectdata *conn = data->conn; |
599 | | |
600 | | /* Set 'num' to 0 or 1, depending on which socket that has been sent here. |
601 | | If it is the second socket, we set num to 1. Otherwise to 0. This lets |
602 | | us use the correct ssl handle. */ |
603 | 0 | int num = (sockfd == conn->sock[SECONDARYSOCKET]); |
604 | |
|
605 | 0 | *n = 0; /* reset amount to zero */ |
606 | |
|
607 | 0 | bytesfromsocket = CURLMIN(sizerequested, (size_t)data->set.buffer_size); |
608 | 0 | buffertofill = buf; |
609 | |
|
610 | 0 | nread = conn->recv[num](data, num, buffertofill, bytesfromsocket, &result); |
611 | 0 | if(nread < 0) |
612 | 0 | goto out; |
613 | | |
614 | 0 | *n += nread; |
615 | 0 | result = CURLE_OK; |
616 | 0 | out: |
617 | 0 | return result; |
618 | 0 | } |