1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2020, 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.haxx.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: ***************************************************************************/
22:
23: #include "curl_setup.h"
24: #include "strtoofft.h"
25:
26: #ifdef HAVE_NETINET_IN_H
27: #include <netinet/in.h>
28: #endif
29: #ifdef HAVE_NETDB_H
30: #include <netdb.h>
31: #endif
32: #ifdef HAVE_ARPA_INET_H
33: #include <arpa/inet.h>
34: #endif
35: #ifdef HAVE_NET_IF_H
36: #include <net/if.h>
37: #endif
38: #ifdef HAVE_SYS_IOCTL_H
39: #include <sys/ioctl.h>
40: #endif
41: #ifdef HAVE_SIGNAL_H
42: #include <signal.h>
43: #endif
44:
45: #ifdef HAVE_SYS_PARAM_H
46: #include <sys/param.h>
47: #endif
48:
49: #ifdef HAVE_SYS_SELECT_H
50: #include <sys/select.h>
51: #elif defined(HAVE_UNISTD_H)
52: #include <unistd.h>
53: #endif
54:
55: #ifndef HAVE_SOCKET
56: #error "We can't compile without socket() support!"
57: #endif
58:
59: #include "urldata.h"
60: #include <curl/curl.h>
61: #include "netrc.h"
62:
63: #include "content_encoding.h"
64: #include "hostip.h"
65: #include "transfer.h"
66: #include "sendf.h"
67: #include "speedcheck.h"
68: #include "progress.h"
69: #include "http.h"
70: #include "url.h"
71: #include "getinfo.h"
72: #include "vtls/vtls.h"
73: #include "select.h"
74: #include "multiif.h"
75: #include "connect.h"
76: #include "non-ascii.h"
77: #include "http2.h"
78: #include "mime.h"
79: #include "strcase.h"
80: #include "urlapi-int.h"
81:
82: /* The last 3 #include files should be in this order */
83: #include "curl_printf.h"
84: #include "curl_memory.h"
85: #include "memdebug.h"
86:
87: #if !defined(CURL_DISABLE_HTTP) || !defined(CURL_DISABLE_SMTP) || \
88: !defined(CURL_DISABLE_IMAP)
89: /*
90: * checkheaders() checks the linked list of custom headers for a
91: * particular header (prefix). Provide the prefix without colon!
92: *
93: * Returns a pointer to the first matching header or NULL if none matched.
94: */
95: char *Curl_checkheaders(const struct connectdata *conn,
96: const char *thisheader)
97: {
98: struct curl_slist *head;
99: size_t thislen = strlen(thisheader);
100: struct Curl_easy *data = conn->data;
101:
102: for(head = data->set.headers; head; head = head->next) {
103: if(strncasecompare(head->data, thisheader, thislen) &&
104: Curl_headersep(head->data[thislen]) )
105: return head->data;
106: }
107:
108: return NULL;
109: }
110: #endif
111:
112: CURLcode Curl_get_upload_buffer(struct Curl_easy *data)
113: {
114: if(!data->state.ulbuf) {
115: data->state.ulbuf = malloc(data->set.upload_buffer_size);
116: if(!data->state.ulbuf)
117: return CURLE_OUT_OF_MEMORY;
118: }
119: return CURLE_OK;
120: }
121:
122: #ifndef CURL_DISABLE_HTTP
123: /*
124: * This function will be called to loop through the trailers buffer
125: * until no more data is available for sending.
126: */
127: static size_t Curl_trailers_read(char *buffer, size_t size, size_t nitems,
128: void *raw)
129: {
130: struct Curl_easy *data = (struct Curl_easy *)raw;
131: Curl_send_buffer *trailers_buf = data->state.trailers_buf;
132: size_t bytes_left = trailers_buf->size_used-data->state.trailers_bytes_sent;
133: size_t to_copy = (size*nitems < bytes_left) ? size*nitems : bytes_left;
134: if(to_copy) {
135: memcpy(buffer,
136: &trailers_buf->buffer[data->state.trailers_bytes_sent],
137: to_copy);
138: data->state.trailers_bytes_sent += to_copy;
139: }
140: return to_copy;
141: }
142:
143: static size_t Curl_trailers_left(void *raw)
144: {
145: struct Curl_easy *data = (struct Curl_easy *)raw;
146: Curl_send_buffer *trailers_buf = data->state.trailers_buf;
147: return trailers_buf->size_used - data->state.trailers_bytes_sent;
148: }
149: #endif
150:
151: /*
152: * This function will call the read callback to fill our buffer with data
153: * to upload.
154: */
155: CURLcode Curl_fillreadbuffer(struct connectdata *conn, size_t bytes,
156: size_t *nreadp)
157: {
158: struct Curl_easy *data = conn->data;
159: size_t buffersize = bytes;
160: size_t nread;
161:
162: curl_read_callback readfunc = NULL;
163: void *extra_data = NULL;
164:
165: #ifdef CURL_DOES_CONVERSIONS
166: bool sending_http_headers = FALSE;
167:
168: if(conn->handler->protocol&(PROTO_FAMILY_HTTP|CURLPROTO_RTSP)) {
169: const struct HTTP *http = data->req.protop;
170:
171: if(http->sending == HTTPSEND_REQUEST)
172: /* We're sending the HTTP request headers, not the data.
173: Remember that so we don't re-translate them into garbage. */
174: sending_http_headers = TRUE;
175: }
176: #endif
177:
178: #ifndef CURL_DISABLE_HTTP
179: if(data->state.trailers_state == TRAILERS_INITIALIZED) {
180: struct curl_slist *trailers = NULL;
181: CURLcode result;
182: int trailers_ret_code;
183:
184: /* at this point we already verified that the callback exists
185: so we compile and store the trailers buffer, then proceed */
186: infof(data,
187: "Moving trailers state machine from initialized to sending.\n");
188: data->state.trailers_state = TRAILERS_SENDING;
189: data->state.trailers_buf = Curl_add_buffer_init();
190: if(!data->state.trailers_buf) {
191: failf(data, "Unable to allocate trailing headers buffer !");
192: return CURLE_OUT_OF_MEMORY;
193: }
194: data->state.trailers_bytes_sent = 0;
195: Curl_set_in_callback(data, true);
196: trailers_ret_code = data->set.trailer_callback(&trailers,
197: data->set.trailer_data);
198: Curl_set_in_callback(data, false);
199: if(trailers_ret_code == CURL_TRAILERFUNC_OK) {
200: result = Curl_http_compile_trailers(trailers, &data->state.trailers_buf,
201: data);
202: }
203: else {
204: failf(data, "operation aborted by trailing headers callback");
205: *nreadp = 0;
206: result = CURLE_ABORTED_BY_CALLBACK;
207: }
208: if(result) {
209: Curl_add_buffer_free(&data->state.trailers_buf);
210: curl_slist_free_all(trailers);
211: return result;
212: }
213: infof(data, "Successfully compiled trailers.\r\n");
214: curl_slist_free_all(trailers);
215: }
216: #endif
217:
218: /* if we are transmitting trailing data, we don't need to write
219: a chunk size so we skip this */
220: if(data->req.upload_chunky &&
221: data->state.trailers_state == TRAILERS_NONE) {
222: /* if chunked Transfer-Encoding */
223: buffersize -= (8 + 2 + 2); /* 32bit hex + CRLF + CRLF */
224: data->req.upload_fromhere += (8 + 2); /* 32bit hex + CRLF */
225: }
226:
227: #ifndef CURL_DISABLE_HTTP
228: if(data->state.trailers_state == TRAILERS_SENDING) {
229: /* if we're here then that means that we already sent the last empty chunk
230: but we didn't send a final CR LF, so we sent 0 CR LF. We then start
231: pulling trailing data until we have no more at which point we
232: simply return to the previous point in the state machine as if
233: nothing happened.
234: */
235: readfunc = Curl_trailers_read;
236: extra_data = (void *)data;
237: }
238: else
239: #endif
240: {
241: readfunc = data->state.fread_func;
242: extra_data = data->state.in;
243: }
244:
245: Curl_set_in_callback(data, true);
246: nread = readfunc(data->req.upload_fromhere, 1,
247: buffersize, extra_data);
248: Curl_set_in_callback(data, false);
249:
250: if(nread == CURL_READFUNC_ABORT) {
251: failf(data, "operation aborted by callback");
252: *nreadp = 0;
253: return CURLE_ABORTED_BY_CALLBACK;
254: }
255: if(nread == CURL_READFUNC_PAUSE) {
256: struct SingleRequest *k = &data->req;
257:
258: if(conn->handler->flags & PROTOPT_NONETWORK) {
259: /* protocols that work without network cannot be paused. This is
260: actually only FILE:// just now, and it can't pause since the transfer
261: isn't done using the "normal" procedure. */
262: failf(data, "Read callback asked for PAUSE when not supported!");
263: return CURLE_READ_ERROR;
264: }
265:
266: /* CURL_READFUNC_PAUSE pauses read callbacks that feed socket writes */
267: k->keepon |= KEEP_SEND_PAUSE; /* mark socket send as paused */
268: if(data->req.upload_chunky) {
269: /* Back out the preallocation done above */
270: data->req.upload_fromhere -= (8 + 2);
271: }
272: *nreadp = 0;
273:
274: return CURLE_OK; /* nothing was read */
275: }
276: else if(nread > buffersize) {
277: /* the read function returned a too large value */
278: *nreadp = 0;
279: failf(data, "read function returned funny value");
280: return CURLE_READ_ERROR;
281: }
282:
283: if(!data->req.forbidchunk && data->req.upload_chunky) {
284: /* if chunked Transfer-Encoding
285: * build chunk:
286: *
287: * <HEX SIZE> CRLF
288: * <DATA> CRLF
289: */
290: /* On non-ASCII platforms the <DATA> may or may not be
291: translated based on set.prefer_ascii while the protocol
292: portion must always be translated to the network encoding.
293: To further complicate matters, line end conversion might be
294: done later on, so we need to prevent CRLFs from becoming
295: CRCRLFs if that's the case. To do this we use bare LFs
296: here, knowing they'll become CRLFs later on.
297: */
298:
299: bool added_crlf = FALSE;
300: int hexlen = 0;
301: const char *endofline_native;
302: const char *endofline_network;
303:
304: if(
305: #ifdef CURL_DO_LINEEND_CONV
306: (data->set.prefer_ascii) ||
307: #endif
308: (data->set.crlf)) {
309: /* \n will become \r\n later on */
310: endofline_native = "\n";
311: endofline_network = "\x0a";
312: }
313: else {
314: endofline_native = "\r\n";
315: endofline_network = "\x0d\x0a";
316: }
317:
318: /* if we're not handling trailing data, proceed as usual */
319: if(data->state.trailers_state != TRAILERS_SENDING) {
320: char hexbuffer[11] = "";
321: hexlen = msnprintf(hexbuffer, sizeof(hexbuffer),
322: "%zx%s", nread, endofline_native);
323:
324: /* move buffer pointer */
325: data->req.upload_fromhere -= hexlen;
326: nread += hexlen;
327:
328: /* copy the prefix to the buffer, leaving out the NUL */
329: memcpy(data->req.upload_fromhere, hexbuffer, hexlen);
330:
331: /* always append ASCII CRLF to the data unless
332: we have a valid trailer callback */
333: #ifndef CURL_DISABLE_HTTP
334: if((nread-hexlen) == 0 &&
335: data->set.trailer_callback != NULL &&
336: data->state.trailers_state == TRAILERS_NONE) {
337: data->state.trailers_state = TRAILERS_INITIALIZED;
338: }
339: else
340: #endif
341: {
342: memcpy(data->req.upload_fromhere + nread,
343: endofline_network,
344: strlen(endofline_network));
345: added_crlf = TRUE;
346: }
347: }
348:
349: #ifdef CURL_DOES_CONVERSIONS
350: {
351: CURLcode result;
352: size_t length;
353: if(data->set.prefer_ascii)
354: /* translate the protocol and data */
355: length = nread;
356: else
357: /* just translate the protocol portion */
358: length = hexlen;
359: if(length) {
360: result = Curl_convert_to_network(data, data->req.upload_fromhere,
361: length);
362: /* Curl_convert_to_network calls failf if unsuccessful */
363: if(result)
364: return result;
365: }
366: }
367: #endif /* CURL_DOES_CONVERSIONS */
368:
369: #ifndef CURL_DISABLE_HTTP
370: if(data->state.trailers_state == TRAILERS_SENDING &&
371: !Curl_trailers_left(data)) {
372: Curl_add_buffer_free(&data->state.trailers_buf);
373: data->state.trailers_state = TRAILERS_DONE;
374: data->set.trailer_data = NULL;
375: data->set.trailer_callback = NULL;
376: /* mark the transfer as done */
377: data->req.upload_done = TRUE;
378: infof(data, "Signaling end of chunked upload after trailers.\n");
379: }
380: else
381: #endif
382: if((nread - hexlen) == 0 &&
383: data->state.trailers_state != TRAILERS_INITIALIZED) {
384: /* mark this as done once this chunk is transferred */
385: data->req.upload_done = TRUE;
386: infof(data,
387: "Signaling end of chunked upload via terminating chunk.\n");
388: }
389:
390: if(added_crlf)
391: nread += strlen(endofline_network); /* for the added end of line */
392: }
393: #ifdef CURL_DOES_CONVERSIONS
394: else if((data->set.prefer_ascii) && (!sending_http_headers)) {
395: CURLcode result;
396: result = Curl_convert_to_network(data, data->req.upload_fromhere, nread);
397: /* Curl_convert_to_network calls failf if unsuccessful */
398: if(result)
399: return result;
400: }
401: #endif /* CURL_DOES_CONVERSIONS */
402:
403: *nreadp = nread;
404:
405: return CURLE_OK;
406: }
407:
408:
409: /*
410: * Curl_readrewind() rewinds the read stream. This is typically used for HTTP
411: * POST/PUT with multi-pass authentication when a sending was denied and a
412: * resend is necessary.
413: */
414: CURLcode Curl_readrewind(struct connectdata *conn)
415: {
416: struct Curl_easy *data = conn->data;
417: curl_mimepart *mimepart = &data->set.mimepost;
418:
419: conn->bits.rewindaftersend = FALSE; /* we rewind now */
420:
421: /* explicitly switch off sending data on this connection now since we are
422: about to restart a new transfer and thus we want to avoid inadvertently
423: sending more data on the existing connection until the next transfer
424: starts */
425: data->req.keepon &= ~KEEP_SEND;
426:
427: /* We have sent away data. If not using CURLOPT_POSTFIELDS or
428: CURLOPT_HTTPPOST, call app to rewind
429: */
430: if(conn->handler->protocol & PROTO_FAMILY_HTTP) {
431: struct HTTP *http = data->req.protop;
432:
433: if(http->sendit)
434: mimepart = http->sendit;
435: }
436: if(data->set.postfields)
437: ; /* do nothing */
438: else if(data->set.httpreq == HTTPREQ_POST_MIME ||
439: data->set.httpreq == HTTPREQ_POST_FORM) {
440: if(Curl_mime_rewind(mimepart)) {
441: failf(data, "Cannot rewind mime/post data");
442: return CURLE_SEND_FAIL_REWIND;
443: }
444: }
445: else {
446: if(data->set.seek_func) {
447: int err;
448:
449: Curl_set_in_callback(data, true);
450: err = (data->set.seek_func)(data->set.seek_client, 0, SEEK_SET);
451: Curl_set_in_callback(data, false);
452: if(err) {
453: failf(data, "seek callback returned error %d", (int)err);
454: return CURLE_SEND_FAIL_REWIND;
455: }
456: }
457: else if(data->set.ioctl_func) {
458: curlioerr err;
459:
460: Curl_set_in_callback(data, true);
461: err = (data->set.ioctl_func)(data, CURLIOCMD_RESTARTREAD,
462: data->set.ioctl_client);
463: Curl_set_in_callback(data, false);
464: infof(data, "the ioctl callback returned %d\n", (int)err);
465:
466: if(err) {
467: failf(data, "ioctl callback returned error %d", (int)err);
468: return CURLE_SEND_FAIL_REWIND;
469: }
470: }
471: else {
472: /* If no CURLOPT_READFUNCTION is used, we know that we operate on a
473: given FILE * stream and we can actually attempt to rewind that
474: ourselves with fseek() */
475: if(data->state.fread_func == (curl_read_callback)fread) {
476: if(-1 != fseek(data->state.in, 0, SEEK_SET))
477: /* successful rewind */
478: return CURLE_OK;
479: }
480:
481: /* no callback set or failure above, makes us fail at once */
482: failf(data, "necessary data rewind wasn't possible");
483: return CURLE_SEND_FAIL_REWIND;
484: }
485: }
486: return CURLE_OK;
487: }
488:
489: static int data_pending(const struct Curl_easy *data)
490: {
491: struct connectdata *conn = data->conn;
492: /* in the case of libssh2, we can never be really sure that we have emptied
493: its internal buffers so we MUST always try until we get EAGAIN back */
494: return conn->handler->protocol&(CURLPROTO_SCP|CURLPROTO_SFTP) ||
495: #if defined(USE_NGHTTP2)
496: Curl_ssl_data_pending(conn, FIRSTSOCKET) ||
497: /* For HTTP/2, we may read up everything including response body
498: with header fields in Curl_http_readwrite_headers. If no
499: content-length is provided, curl waits for the connection
500: close, which we emulate it using conn->proto.httpc.closed =
501: TRUE. The thing is if we read everything, then http2_recv won't
502: be called and we cannot signal the HTTP/2 stream has closed. As
503: a workaround, we return nonzero here to call http2_recv. */
504: ((conn->handler->protocol&PROTO_FAMILY_HTTP) && conn->httpversion >= 20);
505: #elif defined(ENABLE_QUIC)
506: Curl_ssl_data_pending(conn, FIRSTSOCKET) || Curl_quic_data_pending(data);
507: #else
508: Curl_ssl_data_pending(conn, FIRSTSOCKET);
509: #endif
510: }
511:
512: /*
513: * Check to see if CURLOPT_TIMECONDITION was met by comparing the time of the
514: * remote document with the time provided by CURLOPT_TIMEVAL
515: */
516: bool Curl_meets_timecondition(struct Curl_easy *data, time_t timeofdoc)
517: {
518: if((timeofdoc == 0) || (data->set.timevalue == 0))
519: return TRUE;
520:
521: switch(data->set.timecondition) {
522: case CURL_TIMECOND_IFMODSINCE:
523: default:
524: if(timeofdoc <= data->set.timevalue) {
525: infof(data,
526: "The requested document is not new enough\n");
527: data->info.timecond = TRUE;
528: return FALSE;
529: }
530: break;
531: case CURL_TIMECOND_IFUNMODSINCE:
532: if(timeofdoc >= data->set.timevalue) {
533: infof(data,
534: "The requested document is not old enough\n");
535: data->info.timecond = TRUE;
536: return FALSE;
537: }
538: break;
539: }
540:
541: return TRUE;
542: }
543:
544: /*
545: * Go ahead and do a read if we have a readable socket or if
546: * the stream was rewound (in which case we have data in a
547: * buffer)
548: *
549: * return '*comeback' TRUE if we didn't properly drain the socket so this
550: * function should get called again without select() or similar in between!
551: */
552: static CURLcode readwrite_data(struct Curl_easy *data,
553: struct connectdata *conn,
554: struct SingleRequest *k,
555: int *didwhat, bool *done,
556: bool *comeback)
557: {
558: CURLcode result = CURLE_OK;
559: ssize_t nread; /* number of bytes read */
560: size_t excess = 0; /* excess bytes read */
561: bool readmore = FALSE; /* used by RTP to signal for more data */
562: int maxloops = 100;
563:
564: *done = FALSE;
565: *comeback = FALSE;
566:
567: /* This is where we loop until we have read everything there is to
568: read or we get a CURLE_AGAIN */
569: do {
570: bool is_empty_data = FALSE;
571: size_t buffersize = data->set.buffer_size;
572: size_t bytestoread = buffersize;
573: #ifdef USE_NGHTTP2
574: bool is_http2 = ((conn->handler->protocol & PROTO_FAMILY_HTTP) &&
575: (conn->httpversion == 20));
576: #endif
577:
578: if(
579: #ifdef USE_NGHTTP2
580: /* For HTTP/2, read data without caring about the content
581: length. This is safe because body in HTTP/2 is always
582: segmented thanks to its framing layer. Meanwhile, we have to
583: call Curl_read to ensure that http2_handle_stream_close is
584: called when we read all incoming bytes for a particular
585: stream. */
586: !is_http2 &&
587: #endif
588: k->size != -1 && !k->header) {
589: /* make sure we don't read too much */
590: curl_off_t totalleft = k->size - k->bytecount;
591: if(totalleft < (curl_off_t)bytestoread)
592: bytestoread = (size_t)totalleft;
593: }
594:
595: if(bytestoread) {
596: /* receive data from the network! */
597: result = Curl_read(conn, conn->sockfd, k->buf, bytestoread, &nread);
598:
599: /* read would've blocked */
600: if(CURLE_AGAIN == result)
601: break; /* get out of loop */
602:
603: if(result>0)
604: return result;
605: }
606: else {
607: /* read nothing but since we wanted nothing we consider this an OK
608: situation to proceed from */
609: DEBUGF(infof(data, "readwrite_data: we're done!\n"));
610: nread = 0;
611: }
612:
613: if(!k->bytecount) {
614: Curl_pgrsTime(data, TIMER_STARTTRANSFER);
615: if(k->exp100 > EXP100_SEND_DATA)
616: /* set time stamp to compare with when waiting for the 100 */
617: k->start100 = Curl_now();
618: }
619:
620: *didwhat |= KEEP_RECV;
621: /* indicates data of zero size, i.e. empty file */
622: is_empty_data = ((nread == 0) && (k->bodywrites == 0)) ? TRUE : FALSE;
623:
624: /* NUL terminate, allowing string ops to be used */
625: if(0 < nread || is_empty_data) {
626: k->buf[nread] = 0;
627: }
628: else {
629: /* if we receive 0 or less here, either the http2 stream is closed or the
630: server closed the connection and we bail out from this! */
631: #ifdef USE_NGHTTP2
632: if(is_http2 && !nread)
633: DEBUGF(infof(data, "nread == 0, stream closed, bailing\n"));
634: else
635: #endif
636: DEBUGF(infof(data, "nread <= 0, server closed connection, bailing\n"));
637: k->keepon &= ~KEEP_RECV;
638: break;
639: }
640:
641: /* Default buffer to use when we write the buffer, it may be changed
642: in the flow below before the actual storing is done. */
643: k->str = k->buf;
644:
645: if(conn->handler->readwrite) {
646: result = conn->handler->readwrite(data, conn, &nread, &readmore);
647: if(result)
648: return result;
649: if(readmore)
650: break;
651: }
652:
653: #ifndef CURL_DISABLE_HTTP
654: /* Since this is a two-state thing, we check if we are parsing
655: headers at the moment or not. */
656: if(k->header) {
657: /* we are in parse-the-header-mode */
658: bool stop_reading = FALSE;
659: result = Curl_http_readwrite_headers(data, conn, &nread, &stop_reading);
660: if(result)
661: return result;
662:
663: if(conn->handler->readwrite &&
664: (k->maxdownload <= 0 && nread > 0)) {
665: result = conn->handler->readwrite(data, conn, &nread, &readmore);
666: if(result)
667: return result;
668: if(readmore)
669: break;
670: }
671:
672: if(stop_reading) {
673: /* We've stopped dealing with input, get out of the do-while loop */
674:
675: if(nread > 0) {
676: infof(data,
677: "Excess found:"
678: " excess = %zd"
679: " url = %s (zero-length body)\n",
680: nread, data->state.up.path);
681: }
682:
683: break;
684: }
685: }
686: #endif /* CURL_DISABLE_HTTP */
687:
688:
689: /* This is not an 'else if' since it may be a rest from the header
690: parsing, where the beginning of the buffer is headers and the end
691: is non-headers. */
692: if(k->str && !k->header && (nread > 0 || is_empty_data)) {
693:
694: if(data->set.opt_no_body) {
695: /* data arrives although we want none, bail out */
696: streamclose(conn, "ignoring body");
697: *done = TRUE;
698: return CURLE_WEIRD_SERVER_REPLY;
699: }
700:
701: #ifndef CURL_DISABLE_HTTP
702: if(0 == k->bodywrites && !is_empty_data) {
703: /* These checks are only made the first time we are about to
704: write a piece of the body */
705: if(conn->handler->protocol&(PROTO_FAMILY_HTTP|CURLPROTO_RTSP)) {
706: /* HTTP-only checks */
707:
708: if(data->req.newurl) {
709: if(conn->bits.close) {
710: /* Abort after the headers if "follow Location" is set
711: and we're set to close anyway. */
712: k->keepon &= ~KEEP_RECV;
713: *done = TRUE;
714: return CURLE_OK;
715: }
716: /* We have a new url to load, but since we want to be able
717: to re-use this connection properly, we read the full
718: response in "ignore more" */
719: k->ignorebody = TRUE;
720: infof(data, "Ignoring the response-body\n");
721: }
722: if(data->state.resume_from && !k->content_range &&
723: (data->set.httpreq == HTTPREQ_GET) &&
724: !k->ignorebody) {
725:
726: if(k->size == data->state.resume_from) {
727: /* The resume point is at the end of file, consider this fine
728: even if it doesn't allow resume from here. */
729: infof(data, "The entire document is already downloaded");
730: connclose(conn, "already downloaded");
731: /* Abort download */
732: k->keepon &= ~KEEP_RECV;
733: *done = TRUE;
734: return CURLE_OK;
735: }
736:
737: /* we wanted to resume a download, although the server doesn't
738: * seem to support this and we did this with a GET (if it
739: * wasn't a GET we did a POST or PUT resume) */
740: failf(data, "HTTP server doesn't seem to support "
741: "byte ranges. Cannot resume.");
742: return CURLE_RANGE_ERROR;
743: }
744:
745: if(data->set.timecondition && !data->state.range) {
746: /* A time condition has been set AND no ranges have been
747: requested. This seems to be what chapter 13.3.4 of
748: RFC 2616 defines to be the correct action for a
749: HTTP/1.1 client */
750:
751: if(!Curl_meets_timecondition(data, k->timeofdoc)) {
752: *done = TRUE;
753: /* We're simulating a http 304 from server so we return
754: what should have been returned from the server */
755: data->info.httpcode = 304;
756: infof(data, "Simulate a HTTP 304 response!\n");
757: /* we abort the transfer before it is completed == we ruin the
758: re-use ability. Close the connection */
759: connclose(conn, "Simulated 304 handling");
760: return CURLE_OK;
761: }
762: } /* we have a time condition */
763:
764: } /* this is HTTP or RTSP */
765: } /* this is the first time we write a body part */
766: #endif /* CURL_DISABLE_HTTP */
767:
768: k->bodywrites++;
769:
770: /* pass data to the debug function before it gets "dechunked" */
771: if(data->set.verbose) {
772: if(k->badheader) {
773: Curl_debug(data, CURLINFO_DATA_IN, data->state.headerbuff,
774: (size_t)k->hbuflen);
775: if(k->badheader == HEADER_PARTHEADER)
776: Curl_debug(data, CURLINFO_DATA_IN,
777: k->str, (size_t)nread);
778: }
779: else
780: Curl_debug(data, CURLINFO_DATA_IN,
781: k->str, (size_t)nread);
782: }
783:
784: #ifndef CURL_DISABLE_HTTP
785: if(k->chunk) {
786: /*
787: * Here comes a chunked transfer flying and we need to decode this
788: * properly. While the name says read, this function both reads
789: * and writes away the data. The returned 'nread' holds the number
790: * of actual data it wrote to the client.
791: */
792: CURLcode extra;
793: CHUNKcode res =
794: Curl_httpchunk_read(conn, k->str, nread, &nread, &extra);
795:
796: if(CHUNKE_OK < res) {
797: if(CHUNKE_PASSTHRU_ERROR == res) {
798: failf(data, "Failed reading the chunked-encoded stream");
799: return extra;
800: }
801: failf(data, "%s in chunked-encoding", Curl_chunked_strerror(res));
802: return CURLE_RECV_ERROR;
803: }
804: if(CHUNKE_STOP == res) {
805: size_t dataleft;
806: /* we're done reading chunks! */
807: k->keepon &= ~KEEP_RECV; /* read no more */
808:
809: /* There are now possibly N number of bytes at the end of the
810: str buffer that weren't written to the client.
811: Push it back to be read on the next pass. */
812:
813: dataleft = conn->chunk.dataleft;
814: if(dataleft != 0) {
815: infof(conn->data, "Leftovers after chunking: %zu bytes\n",
816: dataleft);
817: }
818: }
819: /* If it returned OK, we just keep going */
820: }
821: #endif /* CURL_DISABLE_HTTP */
822:
823: /* Account for body content stored in the header buffer */
824: if((k->badheader == HEADER_PARTHEADER) && !k->ignorebody) {
825: DEBUGF(infof(data, "Increasing bytecount by %zu from hbuflen\n",
826: k->hbuflen));
827: k->bytecount += k->hbuflen;
828: }
829:
830: if((-1 != k->maxdownload) &&
831: (k->bytecount + nread >= k->maxdownload)) {
832:
833: excess = (size_t)(k->bytecount + nread - k->maxdownload);
834: if(excess > 0 && !k->ignorebody) {
835: infof(data,
836: "Excess found in a read:"
837: " excess = %zu"
838: ", size = %" CURL_FORMAT_CURL_OFF_T
839: ", maxdownload = %" CURL_FORMAT_CURL_OFF_T
840: ", bytecount = %" CURL_FORMAT_CURL_OFF_T "\n",
841: excess, k->size, k->maxdownload, k->bytecount);
842: }
843:
844: nread = (ssize_t) (k->maxdownload - k->bytecount);
845: if(nread < 0) /* this should be unusual */
846: nread = 0;
847:
848: k->keepon &= ~KEEP_RECV; /* we're done reading */
849: }
850:
851: k->bytecount += nread;
852:
853: Curl_pgrsSetDownloadCounter(data, k->bytecount);
854:
855: if(!k->chunk && (nread || k->badheader || is_empty_data)) {
856: /* If this is chunky transfer, it was already written */
857:
858: if(k->badheader && !k->ignorebody) {
859: /* we parsed a piece of data wrongly assuming it was a header
860: and now we output it as body instead */
861:
862: /* Don't let excess data pollute body writes */
863: if(k->maxdownload == -1 || (curl_off_t)k->hbuflen <= k->maxdownload)
864: result = Curl_client_write(conn, CLIENTWRITE_BODY,
865: data->state.headerbuff,
866: k->hbuflen);
867: else
868: result = Curl_client_write(conn, CLIENTWRITE_BODY,
869: data->state.headerbuff,
870: (size_t)k->maxdownload);
871:
872: if(result)
873: return result;
874: }
875: if(k->badheader < HEADER_ALLBAD) {
876: /* This switch handles various content encodings. If there's an
877: error here, be sure to check over the almost identical code
878: in http_chunks.c.
879: Make sure that ALL_CONTENT_ENCODINGS contains all the
880: encodings handled here. */
881: if(conn->data->set.http_ce_skip || !k->writer_stack) {
882: if(!k->ignorebody) {
883: #ifndef CURL_DISABLE_POP3
884: if(conn->handler->protocol & PROTO_FAMILY_POP3)
885: result = Curl_pop3_write(conn, k->str, nread);
886: else
887: #endif /* CURL_DISABLE_POP3 */
888: result = Curl_client_write(conn, CLIENTWRITE_BODY, k->str,
889: nread);
890: }
891: }
892: else if(!k->ignorebody)
893: result = Curl_unencode_write(conn, k->writer_stack, k->str, nread);
894: }
895: k->badheader = HEADER_NORMAL; /* taken care of now */
896:
897: if(result)
898: return result;
899: }
900:
901: } /* if(!header and data to read) */
902:
903: if(conn->handler->readwrite && excess) {
904: /* Parse the excess data */
905: k->str += nread;
906:
907: if(&k->str[excess] > &k->buf[data->set.buffer_size]) {
908: /* the excess amount was too excessive(!), make sure
909: it doesn't read out of buffer */
910: excess = &k->buf[data->set.buffer_size] - k->str;
911: }
912: nread = (ssize_t)excess;
913:
914: result = conn->handler->readwrite(data, conn, &nread, &readmore);
915: if(result)
916: return result;
917:
918: if(readmore)
919: k->keepon |= KEEP_RECV; /* we're not done reading */
920: break;
921: }
922:
923: if(is_empty_data) {
924: /* if we received nothing, the server closed the connection and we
925: are done */
926: k->keepon &= ~KEEP_RECV;
927: }
928:
929: if(k->keepon & KEEP_RECV_PAUSE) {
930: /* this is a paused transfer */
931: break;
932: }
933:
934: } while(data_pending(data) && maxloops--);
935:
936: if(maxloops <= 0) {
937: /* we mark it as read-again-please */
938: conn->cselect_bits = CURL_CSELECT_IN;
939: *comeback = TRUE;
940: }
941:
942: if(((k->keepon & (KEEP_RECV|KEEP_SEND)) == KEEP_SEND) &&
943: conn->bits.close) {
944: /* When we've read the entire thing and the close bit is set, the server
945: may now close the connection. If there's now any kind of sending going
946: on from our side, we need to stop that immediately. */
947: infof(data, "we are done reading and this is set to close, stop send\n");
948: k->keepon &= ~KEEP_SEND; /* no writing anymore either */
949: }
950:
951: return CURLE_OK;
952: }
953:
954: CURLcode Curl_done_sending(struct connectdata *conn,
955: struct SingleRequest *k)
956: {
957: k->keepon &= ~KEEP_SEND; /* we're done writing */
958:
959: /* These functions should be moved into the handler struct! */
960: Curl_http2_done_sending(conn);
961: Curl_quic_done_sending(conn);
962:
963: if(conn->bits.rewindaftersend) {
964: CURLcode result = Curl_readrewind(conn);
965: if(result)
966: return result;
967: }
968: return CURLE_OK;
969: }
970:
971: #if defined(WIN32) && !defined(USE_LWIPSOCK)
972: #ifndef SIO_IDEAL_SEND_BACKLOG_QUERY
973: #define SIO_IDEAL_SEND_BACKLOG_QUERY 0x4004747B
974: #endif
975:
976: static void win_update_buffer_size(curl_socket_t sockfd)
977: {
978: int result;
979: ULONG ideal;
980: DWORD ideallen;
981: result = WSAIoctl(sockfd, SIO_IDEAL_SEND_BACKLOG_QUERY, 0, 0,
982: &ideal, sizeof(ideal), &ideallen, 0, 0);
983: if(result == 0) {
984: setsockopt(sockfd, SOL_SOCKET, SO_SNDBUF,
985: (const char *)&ideal, sizeof(ideal));
986: }
987: }
988: #else
989: #define win_update_buffer_size(x)
990: #endif
991:
992: /*
993: * Send data to upload to the server, when the socket is writable.
994: */
995: static CURLcode readwrite_upload(struct Curl_easy *data,
996: struct connectdata *conn,
997: int *didwhat)
998: {
999: ssize_t i, si;
1000: ssize_t bytes_written;
1001: CURLcode result;
1002: ssize_t nread; /* number of bytes read */
1003: bool sending_http_headers = FALSE;
1004: struct SingleRequest *k = &data->req;
1005:
1006: if((k->bytecount == 0) && (k->writebytecount == 0))
1007: Curl_pgrsTime(data, TIMER_STARTTRANSFER);
1008:
1009: *didwhat |= KEEP_SEND;
1010:
1011: do {
1012: /* only read more data if there's no upload data already
1013: present in the upload buffer */
1014: if(0 == k->upload_present) {
1015: result = Curl_get_upload_buffer(data);
1016: if(result)
1017: return result;
1018: /* init the "upload from here" pointer */
1019: k->upload_fromhere = data->state.ulbuf;
1020:
1021: if(!k->upload_done) {
1022: /* HTTP pollution, this should be written nicer to become more
1023: protocol agnostic. */
1024: size_t fillcount;
1025: struct HTTP *http = k->protop;
1026:
1027: if((k->exp100 == EXP100_SENDING_REQUEST) &&
1028: (http->sending == HTTPSEND_BODY)) {
1029: /* If this call is to send body data, we must take some action:
1030: We have sent off the full HTTP 1.1 request, and we shall now
1031: go into the Expect: 100 state and await such a header */
1032: k->exp100 = EXP100_AWAITING_CONTINUE; /* wait for the header */
1033: k->keepon &= ~KEEP_SEND; /* disable writing */
1034: k->start100 = Curl_now(); /* timeout count starts now */
1035: *didwhat &= ~KEEP_SEND; /* we didn't write anything actually */
1036: /* set a timeout for the multi interface */
1037: Curl_expire(data, data->set.expect_100_timeout, EXPIRE_100_TIMEOUT);
1038: break;
1039: }
1040:
1041: if(conn->handler->protocol&(PROTO_FAMILY_HTTP|CURLPROTO_RTSP)) {
1042: if(http->sending == HTTPSEND_REQUEST)
1043: /* We're sending the HTTP request headers, not the data.
1044: Remember that so we don't change the line endings. */
1045: sending_http_headers = TRUE;
1046: else
1047: sending_http_headers = FALSE;
1048: }
1049:
1050: result = Curl_fillreadbuffer(conn, data->set.upload_buffer_size,
1051: &fillcount);
1052: if(result)
1053: return result;
1054:
1055: nread = fillcount;
1056: }
1057: else
1058: nread = 0; /* we're done uploading/reading */
1059:
1060: if(!nread && (k->keepon & KEEP_SEND_PAUSE)) {
1061: /* this is a paused transfer */
1062: break;
1063: }
1064: if(nread <= 0) {
1065: result = Curl_done_sending(conn, k);
1066: if(result)
1067: return result;
1068: break;
1069: }
1070:
1071: /* store number of bytes available for upload */
1072: k->upload_present = nread;
1073:
1074: /* convert LF to CRLF if so asked */
1075: if((!sending_http_headers) && (
1076: #ifdef CURL_DO_LINEEND_CONV
1077: /* always convert if we're FTPing in ASCII mode */
1078: (data->set.prefer_ascii) ||
1079: #endif
1080: (data->set.crlf))) {
1081: /* Do we need to allocate a scratch buffer? */
1082: if(!data->state.scratch) {
1083: data->state.scratch = malloc(2 * data->set.upload_buffer_size);
1084: if(!data->state.scratch) {
1085: failf(data, "Failed to alloc scratch buffer!");
1086:
1087: return CURLE_OUT_OF_MEMORY;
1088: }
1089: }
1090:
1091: /*
1092: * ASCII/EBCDIC Note: This is presumably a text (not binary)
1093: * transfer so the data should already be in ASCII.
1094: * That means the hex values for ASCII CR (0x0d) & LF (0x0a)
1095: * must be used instead of the escape sequences \r & \n.
1096: */
1097: for(i = 0, si = 0; i < nread; i++, si++) {
1098: if(k->upload_fromhere[i] == 0x0a) {
1099: data->state.scratch[si++] = 0x0d;
1100: data->state.scratch[si] = 0x0a;
1101: if(!data->set.crlf) {
1102: /* we're here only because FTP is in ASCII mode...
1103: bump infilesize for the LF we just added */
1104: if(data->state.infilesize != -1)
1105: data->state.infilesize++;
1106: }
1107: }
1108: else
1109: data->state.scratch[si] = k->upload_fromhere[i];
1110: }
1111:
1112: if(si != nread) {
1113: /* only perform the special operation if we really did replace
1114: anything */
1115: nread = si;
1116:
1117: /* upload from the new (replaced) buffer instead */
1118: k->upload_fromhere = data->state.scratch;
1119:
1120: /* set the new amount too */
1121: k->upload_present = nread;
1122: }
1123: }
1124:
1125: #ifndef CURL_DISABLE_SMTP
1126: if(conn->handler->protocol & PROTO_FAMILY_SMTP) {
1127: result = Curl_smtp_escape_eob(conn, nread);
1128: if(result)
1129: return result;
1130: }
1131: #endif /* CURL_DISABLE_SMTP */
1132: } /* if 0 == k->upload_present */
1133: else {
1134: /* We have a partial buffer left from a previous "round". Use
1135: that instead of reading more data */
1136: }
1137:
1138: /* write to socket (send away data) */
1139: result = Curl_write(conn,
1140: conn->writesockfd, /* socket to send to */
1141: k->upload_fromhere, /* buffer pointer */
1142: k->upload_present, /* buffer size */
1143: &bytes_written); /* actually sent */
1144: if(result)
1145: return result;
1146:
1147: win_update_buffer_size(conn->writesockfd);
1148:
1149: if(data->set.verbose)
1150: /* show the data before we change the pointer upload_fromhere */
1151: Curl_debug(data, CURLINFO_DATA_OUT, k->upload_fromhere,
1152: (size_t)bytes_written);
1153:
1154: k->writebytecount += bytes_written;
1155: Curl_pgrsSetUploadCounter(data, k->writebytecount);
1156:
1157: if((!k->upload_chunky || k->forbidchunk) &&
1158: (k->writebytecount == data->state.infilesize)) {
1159: /* we have sent all data we were supposed to */
1160: k->upload_done = TRUE;
1161: infof(data, "We are completely uploaded and fine\n");
1162: }
1163:
1164: if(k->upload_present != bytes_written) {
1165: /* we only wrote a part of the buffer (if anything), deal with it! */
1166:
1167: /* store the amount of bytes left in the buffer to write */
1168: k->upload_present -= bytes_written;
1169:
1170: /* advance the pointer where to find the buffer when the next send
1171: is to happen */
1172: k->upload_fromhere += bytes_written;
1173: }
1174: else {
1175: /* we've uploaded that buffer now */
1176: result = Curl_get_upload_buffer(data);
1177: if(result)
1178: return result;
1179: k->upload_fromhere = data->state.ulbuf;
1180: k->upload_present = 0; /* no more bytes left */
1181:
1182: if(k->upload_done) {
1183: result = Curl_done_sending(conn, k);
1184: if(result)
1185: return result;
1186: }
1187: }
1188:
1189:
1190: } while(0); /* just to break out from! */
1191:
1192: return CURLE_OK;
1193: }
1194:
1195: /*
1196: * Curl_readwrite() is the low-level function to be called when data is to
1197: * be read and written to/from the connection.
1198: *
1199: * return '*comeback' TRUE if we didn't properly drain the socket so this
1200: * function should get called again without select() or similar in between!
1201: */
1202: CURLcode Curl_readwrite(struct connectdata *conn,
1203: struct Curl_easy *data,
1204: bool *done,
1205: bool *comeback)
1206: {
1207: struct SingleRequest *k = &data->req;
1208: CURLcode result;
1209: int didwhat = 0;
1210:
1211: curl_socket_t fd_read;
1212: curl_socket_t fd_write;
1213: int select_res = conn->cselect_bits;
1214:
1215: conn->cselect_bits = 0;
1216:
1217: /* only use the proper socket if the *_HOLD bit is not set simultaneously as
1218: then we are in rate limiting state in that transfer direction */
1219:
1220: if((k->keepon & KEEP_RECVBITS) == KEEP_RECV)
1221: fd_read = conn->sockfd;
1222: else
1223: fd_read = CURL_SOCKET_BAD;
1224:
1225: if((k->keepon & KEEP_SENDBITS) == KEEP_SEND)
1226: fd_write = conn->writesockfd;
1227: else
1228: fd_write = CURL_SOCKET_BAD;
1229:
1230: if(conn->data->state.drain) {
1231: select_res |= CURL_CSELECT_IN;
1232: DEBUGF(infof(data, "Curl_readwrite: forcibly told to drain data\n"));
1233: }
1234:
1235: if(!select_res) /* Call for select()/poll() only, if read/write/error
1236: status is not known. */
1237: select_res = Curl_socket_check(fd_read, CURL_SOCKET_BAD, fd_write, 0);
1238:
1239: if(select_res == CURL_CSELECT_ERR) {
1240: failf(data, "select/poll returned error");
1241: return CURLE_SEND_ERROR;
1242: }
1243:
1244: /* We go ahead and do a read if we have a readable socket or if
1245: the stream was rewound (in which case we have data in a
1246: buffer) */
1247: if((k->keepon & KEEP_RECV) && (select_res & CURL_CSELECT_IN)) {
1248: result = readwrite_data(data, conn, k, &didwhat, done, comeback);
1249: if(result || *done)
1250: return result;
1251: }
1252:
1253: /* If we still have writing to do, we check if we have a writable socket. */
1254: if((k->keepon & KEEP_SEND) && (select_res & CURL_CSELECT_OUT)) {
1255: /* write */
1256:
1257: result = readwrite_upload(data, conn, &didwhat);
1258: if(result)
1259: return result;
1260: }
1261:
1262: k->now = Curl_now();
1263: if(didwhat) {
1264: ;
1265: }
1266: else {
1267: /* no read no write, this is a timeout? */
1268: if(k->exp100 == EXP100_AWAITING_CONTINUE) {
1269: /* This should allow some time for the header to arrive, but only a
1270: very short time as otherwise it'll be too much wasted time too
1271: often. */
1272:
1273: /* Quoting RFC2616, section "8.2.3 Use of the 100 (Continue) Status":
1274:
1275: Therefore, when a client sends this header field to an origin server
1276: (possibly via a proxy) from which it has never seen a 100 (Continue)
1277: status, the client SHOULD NOT wait for an indefinite period before
1278: sending the request body.
1279:
1280: */
1281:
1282: timediff_t ms = Curl_timediff(k->now, k->start100);
1283: if(ms >= data->set.expect_100_timeout) {
1284: /* we've waited long enough, continue anyway */
1285: k->exp100 = EXP100_SEND_DATA;
1286: k->keepon |= KEEP_SEND;
1287: Curl_expire_done(data, EXPIRE_100_TIMEOUT);
1288: infof(data, "Done waiting for 100-continue\n");
1289: }
1290: }
1291: }
1292:
1293: if(Curl_pgrsUpdate(conn))
1294: result = CURLE_ABORTED_BY_CALLBACK;
1295: else
1296: result = Curl_speedcheck(data, k->now);
1297: if(result)
1298: return result;
1299:
1300: if(k->keepon) {
1301: if(0 > Curl_timeleft(data, &k->now, FALSE)) {
1302: if(k->size != -1) {
1303: failf(data, "Operation timed out after %" CURL_FORMAT_TIMEDIFF_T
1304: " milliseconds with %" CURL_FORMAT_CURL_OFF_T " out of %"
1305: CURL_FORMAT_CURL_OFF_T " bytes received",
1306: Curl_timediff(k->now, data->progress.t_startsingle),
1307: k->bytecount, k->size);
1308: }
1309: else {
1310: failf(data, "Operation timed out after %" CURL_FORMAT_TIMEDIFF_T
1311: " milliseconds with %" CURL_FORMAT_CURL_OFF_T " bytes received",
1312: Curl_timediff(k->now, data->progress.t_startsingle),
1313: k->bytecount);
1314: }
1315: return CURLE_OPERATION_TIMEDOUT;
1316: }
1317: }
1318: else {
1319: /*
1320: * The transfer has been performed. Just make some general checks before
1321: * returning.
1322: */
1323:
1324: if(!(data->set.opt_no_body) && (k->size != -1) &&
1325: (k->bytecount != k->size) &&
1326: #ifdef CURL_DO_LINEEND_CONV
1327: /* Most FTP servers don't adjust their file SIZE response for CRLFs,
1328: so we'll check to see if the discrepancy can be explained
1329: by the number of CRLFs we've changed to LFs.
1330: */
1331: (k->bytecount != (k->size + data->state.crlf_conversions)) &&
1332: #endif /* CURL_DO_LINEEND_CONV */
1333: !k->newurl) {
1334: failf(data, "transfer closed with %" CURL_FORMAT_CURL_OFF_T
1335: " bytes remaining to read", k->size - k->bytecount);
1336: return CURLE_PARTIAL_FILE;
1337: }
1338: if(!(data->set.opt_no_body) && k->chunk &&
1339: (conn->chunk.state != CHUNK_STOP)) {
1340: /*
1341: * In chunked mode, return an error if the connection is closed prior to
1342: * the empty (terminating) chunk is read.
1343: *
1344: * The condition above used to check for
1345: * conn->proto.http->chunk.datasize != 0 which is true after reading
1346: * *any* chunk, not just the empty chunk.
1347: *
1348: */
1349: failf(data, "transfer closed with outstanding read data remaining");
1350: return CURLE_PARTIAL_FILE;
1351: }
1352: if(Curl_pgrsUpdate(conn))
1353: return CURLE_ABORTED_BY_CALLBACK;
1354: }
1355:
1356: /* Now update the "done" boolean we return */
1357: *done = (0 == (k->keepon&(KEEP_RECV|KEEP_SEND|
1358: KEEP_RECV_PAUSE|KEEP_SEND_PAUSE))) ? TRUE : FALSE;
1359:
1360: return CURLE_OK;
1361: }
1362:
1363: /*
1364: * Curl_single_getsock() gets called by the multi interface code when the app
1365: * has requested to get the sockets for the current connection. This function
1366: * will then be called once for every connection that the multi interface
1367: * keeps track of. This function will only be called for connections that are
1368: * in the proper state to have this information available.
1369: */
1370: int Curl_single_getsock(const struct connectdata *conn,
1371: curl_socket_t *sock)
1372: {
1373: const struct Curl_easy *data = conn->data;
1374: int bitmap = GETSOCK_BLANK;
1375: unsigned sockindex = 0;
1376:
1377: if(conn->handler->perform_getsock)
1378: return conn->handler->perform_getsock(conn, sock);
1379:
1380: /* don't include HOLD and PAUSE connections */
1381: if((data->req.keepon & KEEP_RECVBITS) == KEEP_RECV) {
1382:
1383: DEBUGASSERT(conn->sockfd != CURL_SOCKET_BAD);
1384:
1385: bitmap |= GETSOCK_READSOCK(sockindex);
1386: sock[sockindex] = conn->sockfd;
1387: }
1388:
1389: /* don't include HOLD and PAUSE connections */
1390: if((data->req.keepon & KEEP_SENDBITS) == KEEP_SEND) {
1391:
1392: if((conn->sockfd != conn->writesockfd) ||
1393: bitmap == GETSOCK_BLANK) {
1394: /* only if they are not the same socket and we have a readable
1395: one, we increase index */
1396: if(bitmap != GETSOCK_BLANK)
1397: sockindex++; /* increase index if we need two entries */
1398:
1399: DEBUGASSERT(conn->writesockfd != CURL_SOCKET_BAD);
1400:
1401: sock[sockindex] = conn->writesockfd;
1402: }
1403:
1404: bitmap |= GETSOCK_WRITESOCK(sockindex);
1405: }
1406:
1407: return bitmap;
1408: }
1409:
1410: /* Curl_init_CONNECT() gets called each time the handle switches to CONNECT
1411: which means this gets called once for each subsequent redirect etc */
1412: void Curl_init_CONNECT(struct Curl_easy *data)
1413: {
1414: data->state.fread_func = data->set.fread_func_set;
1415: data->state.in = data->set.in_set;
1416: }
1417:
1418: /*
1419: * Curl_pretransfer() is called immediately before a transfer starts, and only
1420: * once for one transfer no matter if it has redirects or do multi-pass
1421: * authentication etc.
1422: */
1423: CURLcode Curl_pretransfer(struct Curl_easy *data)
1424: {
1425: CURLcode result;
1426:
1427: if(!data->change.url && !data->set.uh) {
1428: /* we can't do anything without URL */
1429: failf(data, "No URL set!");
1430: return CURLE_URL_MALFORMAT;
1431: }
1432:
1433: /* since the URL may have been redirected in a previous use of this handle */
1434: if(data->change.url_alloc) {
1435: /* the already set URL is allocated, free it first! */
1436: Curl_safefree(data->change.url);
1437: data->change.url_alloc = FALSE;
1438: }
1439:
1440: if(!data->change.url && data->set.uh) {
1441: CURLUcode uc;
1442: uc = curl_url_get(data->set.uh,
1443: CURLUPART_URL, &data->set.str[STRING_SET_URL], 0);
1444: if(uc) {
1445: failf(data, "No URL set!");
1446: return CURLE_URL_MALFORMAT;
1447: }
1448: }
1449:
1450: data->change.url = data->set.str[STRING_SET_URL];
1451:
1452: /* Init the SSL session ID cache here. We do it here since we want to do it
1453: after the *_setopt() calls (that could specify the size of the cache) but
1454: before any transfer takes place. */
1455: result = Curl_ssl_initsessions(data, data->set.general_ssl.max_ssl_sessions);
1456: if(result)
1457: return result;
1458:
1459: data->state.wildcardmatch = data->set.wildcard_enabled;
1460: data->set.followlocation = 0; /* reset the location-follow counter */
1461: data->state.this_is_a_follow = FALSE; /* reset this */
1462: data->state.errorbuf = FALSE; /* no error has occurred */
1463: data->state.httpversion = 0; /* don't assume any particular server version */
1464:
1465: data->state.authproblem = FALSE;
1466: data->state.authhost.want = data->set.httpauth;
1467: data->state.authproxy.want = data->set.proxyauth;
1468: Curl_safefree(data->info.wouldredirect);
1469: data->info.wouldredirect = NULL;
1470:
1471: if(data->set.httpreq == HTTPREQ_PUT)
1472: data->state.infilesize = data->set.filesize;
1473: else if((data->set.httpreq != HTTPREQ_GET) &&
1474: (data->set.httpreq != HTTPREQ_HEAD)) {
1475: data->state.infilesize = data->set.postfieldsize;
1476: if(data->set.postfields && (data->state.infilesize == -1))
1477: data->state.infilesize = (curl_off_t)strlen(data->set.postfields);
1478: }
1479: else
1480: data->state.infilesize = 0;
1481:
1482: /* If there is a list of cookie files to read, do it now! */
1483: if(data->change.cookielist)
1484: Curl_cookie_loadfiles(data);
1485:
1486: /* If there is a list of host pairs to deal with */
1487: if(data->change.resolve)
1488: result = Curl_loadhostpairs(data);
1489:
1490: if(!result) {
1491: /* Allow data->set.use_port to set which port to use. This needs to be
1492: * disabled for example when we follow Location: headers to URLs using
1493: * different ports! */
1494: data->state.allow_port = TRUE;
1495:
1496: #if defined(HAVE_SIGNAL) && defined(SIGPIPE) && !defined(HAVE_MSG_NOSIGNAL)
1497: /*************************************************************
1498: * Tell signal handler to ignore SIGPIPE
1499: *************************************************************/
1500: if(!data->set.no_signal)
1501: data->state.prev_signal = signal(SIGPIPE, SIG_IGN);
1502: #endif
1503:
1504: Curl_initinfo(data); /* reset session-specific information "variables" */
1505: Curl_pgrsResetTransferSizes(data);
1506: Curl_pgrsStartNow(data);
1507:
1508: /* In case the handle is re-used and an authentication method was picked
1509: in the session we need to make sure we only use the one(s) we now
1510: consider to be fine */
1511: data->state.authhost.picked &= data->state.authhost.want;
1512: data->state.authproxy.picked &= data->state.authproxy.want;
1513:
1514: #ifndef CURL_DISABLE_FTP
1515: if(data->state.wildcardmatch) {
1516: struct WildcardData *wc = &data->wildcard;
1517: if(wc->state < CURLWC_INIT) {
1518: result = Curl_wildcard_init(wc); /* init wildcard structures */
1519: if(result)
1520: return CURLE_OUT_OF_MEMORY;
1521: }
1522: }
1523: #endif
1524: Curl_http2_init_state(&data->state);
1525: }
1526:
1527: return result;
1528: }
1529:
1530: /*
1531: * Curl_posttransfer() is called immediately after a transfer ends
1532: */
1533: CURLcode Curl_posttransfer(struct Curl_easy *data)
1534: {
1535: #if defined(HAVE_SIGNAL) && defined(SIGPIPE) && !defined(HAVE_MSG_NOSIGNAL)
1536: /* restore the signal handler for SIGPIPE before we get back */
1537: if(!data->set.no_signal)
1538: signal(SIGPIPE, data->state.prev_signal);
1539: #else
1540: (void)data; /* unused parameter */
1541: #endif
1542:
1543: return CURLE_OK;
1544: }
1545:
1546: /*
1547: * Curl_follow() handles the URL redirect magic. Pass in the 'newurl' string
1548: * as given by the remote server and set up the new URL to request.
1549: *
1550: * This function DOES NOT FREE the given url.
1551: */
1552: CURLcode Curl_follow(struct Curl_easy *data,
1553: char *newurl, /* the Location: string */
1554: followtype type) /* see transfer.h */
1555: {
1556: #ifdef CURL_DISABLE_HTTP
1557: (void)data;
1558: (void)newurl;
1559: (void)type;
1560: /* Location: following will not happen when HTTP is disabled */
1561: return CURLE_TOO_MANY_REDIRECTS;
1562: #else
1563:
1564: /* Location: redirect */
1565: bool disallowport = FALSE;
1566: bool reachedmax = FALSE;
1567: CURLUcode uc;
1568:
1569: if(type == FOLLOW_REDIR) {
1570: if((data->set.maxredirs != -1) &&
1571: (data->set.followlocation >= data->set.maxredirs)) {
1572: reachedmax = TRUE;
1573: type = FOLLOW_FAKE; /* switch to fake to store the would-be-redirected
1574: to URL */
1575: }
1576: else {
1577: /* mark the next request as a followed location: */
1578: data->state.this_is_a_follow = TRUE;
1579:
1580: data->set.followlocation++; /* count location-followers */
1581:
1582: if(data->set.http_auto_referer) {
1583: /* We are asked to automatically set the previous URL as the referer
1584: when we get the next URL. We pick the ->url field, which may or may
1585: not be 100% correct */
1586:
1587: if(data->change.referer_alloc) {
1588: Curl_safefree(data->change.referer);
1589: data->change.referer_alloc = FALSE;
1590: }
1591:
1592: data->change.referer = strdup(data->change.url);
1593: if(!data->change.referer)
1594: return CURLE_OUT_OF_MEMORY;
1595: data->change.referer_alloc = TRUE; /* yes, free this later */
1596: }
1597: }
1598: }
1599:
1600: if(Curl_is_absolute_url(newurl, NULL, MAX_SCHEME_LEN))
1601: /* This is an absolute URL, don't allow the custom port number */
1602: disallowport = TRUE;
1603:
1604: DEBUGASSERT(data->state.uh);
1605: uc = curl_url_set(data->state.uh, CURLUPART_URL, newurl,
1606: (type == FOLLOW_FAKE) ? CURLU_NON_SUPPORT_SCHEME :
1607: ((type == FOLLOW_REDIR) ? CURLU_URLENCODE : 0) );
1608: if(uc) {
1609: if(type != FOLLOW_FAKE)
1610: return Curl_uc_to_curlcode(uc);
1611:
1612: /* the URL could not be parsed for some reason, but since this is FAKE
1613: mode, just duplicate the field as-is */
1614: newurl = strdup(newurl);
1615: if(!newurl)
1616: return CURLE_OUT_OF_MEMORY;
1617: }
1618: else {
1619:
1620: uc = curl_url_get(data->state.uh, CURLUPART_URL, &newurl, 0);
1621: if(uc)
1622: return Curl_uc_to_curlcode(uc);
1623: }
1624:
1625: if(type == FOLLOW_FAKE) {
1626: /* we're only figuring out the new url if we would've followed locations
1627: but now we're done so we can get out! */
1628: data->info.wouldredirect = newurl;
1629:
1630: if(reachedmax) {
1631: failf(data, "Maximum (%ld) redirects followed", data->set.maxredirs);
1632: return CURLE_TOO_MANY_REDIRECTS;
1633: }
1634: return CURLE_OK;
1635: }
1636:
1637: if(disallowport)
1638: data->state.allow_port = FALSE;
1639:
1640: if(data->change.url_alloc)
1641: Curl_safefree(data->change.url);
1642:
1643: data->change.url = newurl;
1644: data->change.url_alloc = TRUE;
1645:
1646: infof(data, "Issue another request to this URL: '%s'\n", data->change.url);
1647:
1648: /*
1649: * We get here when the HTTP code is 300-399 (and 401). We need to perform
1650: * differently based on exactly what return code there was.
1651: *
1652: * News from 7.10.6: we can also get here on a 401 or 407, in case we act on
1653: * a HTTP (proxy-) authentication scheme other than Basic.
1654: */
1655: switch(data->info.httpcode) {
1656: /* 401 - Act on a WWW-Authenticate, we keep on moving and do the
1657: Authorization: XXXX header in the HTTP request code snippet */
1658: /* 407 - Act on a Proxy-Authenticate, we keep on moving and do the
1659: Proxy-Authorization: XXXX header in the HTTP request code snippet */
1660: /* 300 - Multiple Choices */
1661: /* 306 - Not used */
1662: /* 307 - Temporary Redirect */
1663: default: /* for all above (and the unknown ones) */
1664: /* Some codes are explicitly mentioned since I've checked RFC2616 and they
1665: * seem to be OK to POST to.
1666: */
1667: break;
1668: case 301: /* Moved Permanently */
1669: /* (quote from RFC7231, section 6.4.2)
1670: *
1671: * Note: For historical reasons, a user agent MAY change the request
1672: * method from POST to GET for the subsequent request. If this
1673: * behavior is undesired, the 307 (Temporary Redirect) status code
1674: * can be used instead.
1675: *
1676: * ----
1677: *
1678: * Many webservers expect this, so these servers often answers to a POST
1679: * request with an error page. To be sure that libcurl gets the page that
1680: * most user agents would get, libcurl has to force GET.
1681: *
1682: * This behaviour is forbidden by RFC1945 and the obsolete RFC2616, and
1683: * can be overridden with CURLOPT_POSTREDIR.
1684: */
1685: if((data->set.httpreq == HTTPREQ_POST
1686: || data->set.httpreq == HTTPREQ_POST_FORM
1687: || data->set.httpreq == HTTPREQ_POST_MIME)
1688: && !(data->set.keep_post & CURL_REDIR_POST_301)) {
1689: infof(data, "Switch from POST to GET\n");
1690: data->set.httpreq = HTTPREQ_GET;
1691: }
1692: break;
1693: case 302: /* Found */
1694: /* (quote from RFC7231, section 6.4.3)
1695: *
1696: * Note: For historical reasons, a user agent MAY change the request
1697: * method from POST to GET for the subsequent request. If this
1698: * behavior is undesired, the 307 (Temporary Redirect) status code
1699: * can be used instead.
1700: *
1701: * ----
1702: *
1703: * Many webservers expect this, so these servers often answers to a POST
1704: * request with an error page. To be sure that libcurl gets the page that
1705: * most user agents would get, libcurl has to force GET.
1706: *
1707: * This behaviour is forbidden by RFC1945 and the obsolete RFC2616, and
1708: * can be overridden with CURLOPT_POSTREDIR.
1709: */
1710: if((data->set.httpreq == HTTPREQ_POST
1711: || data->set.httpreq == HTTPREQ_POST_FORM
1712: || data->set.httpreq == HTTPREQ_POST_MIME)
1713: && !(data->set.keep_post & CURL_REDIR_POST_302)) {
1714: infof(data, "Switch from POST to GET\n");
1715: data->set.httpreq = HTTPREQ_GET;
1716: }
1717: break;
1718:
1719: case 303: /* See Other */
1720: /* 'See Other' location is not the resource but a substitute for the
1721: * resource. In this case we switch the method to GET/HEAD, unless the
1722: * method is POST and the user specified to keep it as POST.
1723: * https://github.com/curl/curl/issues/5237#issuecomment-614641049
1724: */
1725: if(data->set.httpreq != HTTPREQ_GET &&
1726: ((data->set.httpreq != HTTPREQ_POST &&
1727: data->set.httpreq != HTTPREQ_POST_FORM &&
1728: data->set.httpreq != HTTPREQ_POST_MIME) ||
1729: !(data->set.keep_post & CURL_REDIR_POST_303))) {
1730: data->set.httpreq = HTTPREQ_GET;
1731: data->set.upload = false;
1732: infof(data, "Switch to %s\n",
1733: data->set.opt_no_body?"HEAD":"GET");
1734: }
1735: break;
1736: case 304: /* Not Modified */
1737: /* 304 means we did a conditional request and it was "Not modified".
1738: * We shouldn't get any Location: header in this response!
1739: */
1740: break;
1741: case 305: /* Use Proxy */
1742: /* (quote from RFC2616, section 10.3.6):
1743: * "The requested resource MUST be accessed through the proxy given
1744: * by the Location field. The Location field gives the URI of the
1745: * proxy. The recipient is expected to repeat this single request
1746: * via the proxy. 305 responses MUST only be generated by origin
1747: * servers."
1748: */
1749: break;
1750: }
1751: Curl_pgrsTime(data, TIMER_REDIRECT);
1752: Curl_pgrsResetTransferSizes(data);
1753:
1754: return CURLE_OK;
1755: #endif /* CURL_DISABLE_HTTP */
1756: }
1757:
1758: /* Returns CURLE_OK *and* sets '*url' if a request retry is wanted.
1759:
1760: NOTE: that the *url is malloc()ed. */
1761: CURLcode Curl_retry_request(struct connectdata *conn,
1762: char **url)
1763: {
1764: struct Curl_easy *data = conn->data;
1765: bool retry = FALSE;
1766: *url = NULL;
1767:
1768: /* if we're talking upload, we can't do the checks below, unless the protocol
1769: is HTTP as when uploading over HTTP we will still get a response */
1770: if(data->set.upload &&
1771: !(conn->handler->protocol&(PROTO_FAMILY_HTTP|CURLPROTO_RTSP)))
1772: return CURLE_OK;
1773:
1774: if((data->req.bytecount + data->req.headerbytecount == 0) &&
1775: conn->bits.reuse &&
1776: (!data->set.opt_no_body
1777: || (conn->handler->protocol & PROTO_FAMILY_HTTP)) &&
1778: (data->set.rtspreq != RTSPREQ_RECEIVE))
1779: /* We got no data, we attempted to re-use a connection. For HTTP this
1780: can be a retry so we try again regardless if we expected a body.
1781: For other protocols we only try again only if we expected a body.
1782:
1783: This might happen if the connection was left alive when we were
1784: done using it before, but that was closed when we wanted to read from
1785: it again. Bad luck. Retry the same request on a fresh connect! */
1786: retry = TRUE;
1787: else if(data->state.refused_stream &&
1788: (data->req.bytecount + data->req.headerbytecount == 0) ) {
1789: /* This was sent on a refused stream, safe to rerun. A refused stream
1790: error can typically only happen on HTTP/2 level if the stream is safe
1791: to issue again, but the nghttp2 API can deliver the message to other
1792: streams as well, which is why this adds the check the data counters
1793: too. */
1794: infof(conn->data, "REFUSED_STREAM, retrying a fresh connect\n");
1795: data->state.refused_stream = FALSE; /* clear again */
1796: retry = TRUE;
1797: }
1798: if(retry) {
1799: #define CONN_MAX_RETRIES 5
1800: if(conn->retrycount++ >= CONN_MAX_RETRIES) {
1801: failf(data, "Connection died, tried %d times before giving up",
1802: CONN_MAX_RETRIES);
1803: return CURLE_SEND_ERROR;
1804: }
1805: infof(conn->data, "Connection died, retrying a fresh connect\n");
1806: *url = strdup(conn->data->change.url);
1807: if(!*url)
1808: return CURLE_OUT_OF_MEMORY;
1809:
1810: connclose(conn, "retry"); /* close this connection */
1811: conn->bits.retry = TRUE; /* mark this as a connection we're about
1812: to retry. Marking it this way should
1813: prevent i.e HTTP transfers to return
1814: error just because nothing has been
1815: transferred! */
1816:
1817:
1818: if(conn->handler->protocol&PROTO_FAMILY_HTTP) {
1819: if(data->req.writebytecount) {
1820: CURLcode result = Curl_readrewind(conn);
1821: if(result) {
1822: Curl_safefree(*url);
1823: return result;
1824: }
1825: }
1826: }
1827: }
1828: return CURLE_OK;
1829: }
1830:
1831: /*
1832: * Curl_setup_transfer() is called to setup some basic properties for the
1833: * upcoming transfer.
1834: */
1835: void
1836: Curl_setup_transfer(
1837: struct Curl_easy *data, /* transfer */
1838: int sockindex, /* socket index to read from or -1 */
1839: curl_off_t size, /* -1 if unknown at this point */
1840: bool getheader, /* TRUE if header parsing is wanted */
1841: int writesockindex /* socket index to write to, it may very well be
1842: the same we read from. -1 disables */
1843: )
1844: {
1845: struct SingleRequest *k = &data->req;
1846: struct connectdata *conn = data->conn;
1847: struct HTTP *http = data->req.protop;
1848: bool httpsending = ((conn->handler->protocol&PROTO_FAMILY_HTTP) &&
1849: (http->sending == HTTPSEND_REQUEST));
1850: DEBUGASSERT(conn != NULL);
1851: DEBUGASSERT((sockindex <= 1) && (sockindex >= -1));
1852:
1853: if(conn->bits.multiplex || conn->httpversion == 20 || httpsending) {
1854: /* when multiplexing, the read/write sockets need to be the same! */
1855: conn->sockfd = sockindex == -1 ?
1856: ((writesockindex == -1 ? CURL_SOCKET_BAD : conn->sock[writesockindex])) :
1857: conn->sock[sockindex];
1858: conn->writesockfd = conn->sockfd;
1859: if(httpsending)
1860: /* special and very HTTP-specific */
1861: writesockindex = FIRSTSOCKET;
1862: }
1863: else {
1864: conn->sockfd = sockindex == -1 ?
1865: CURL_SOCKET_BAD : conn->sock[sockindex];
1866: conn->writesockfd = writesockindex == -1 ?
1867: CURL_SOCKET_BAD:conn->sock[writesockindex];
1868: }
1869: k->getheader = getheader;
1870:
1871: k->size = size;
1872:
1873: /* The code sequence below is placed in this function just because all
1874: necessary input is not always known in do_complete() as this function may
1875: be called after that */
1876:
1877: if(!k->getheader) {
1878: k->header = FALSE;
1879: if(size > 0)
1880: Curl_pgrsSetDownloadSize(data, size);
1881: }
1882: /* we want header and/or body, if neither then don't do this! */
1883: if(k->getheader || !data->set.opt_no_body) {
1884:
1885: if(sockindex != -1)
1886: k->keepon |= KEEP_RECV;
1887:
1888: if(writesockindex != -1) {
1889: /* HTTP 1.1 magic:
1890:
1891: Even if we require a 100-return code before uploading data, we might
1892: need to write data before that since the REQUEST may not have been
1893: finished sent off just yet.
1894:
1895: Thus, we must check if the request has been sent before we set the
1896: state info where we wait for the 100-return code
1897: */
1898: if((data->state.expect100header) &&
1899: (conn->handler->protocol&PROTO_FAMILY_HTTP) &&
1900: (http->sending == HTTPSEND_BODY)) {
1901: /* wait with write until we either got 100-continue or a timeout */
1902: k->exp100 = EXP100_AWAITING_CONTINUE;
1903: k->start100 = Curl_now();
1904:
1905: /* Set a timeout for the multi interface. Add the inaccuracy margin so
1906: that we don't fire slightly too early and get denied to run. */
1907: Curl_expire(data, data->set.expect_100_timeout, EXPIRE_100_TIMEOUT);
1908: }
1909: else {
1910: if(data->state.expect100header)
1911: /* when we've sent off the rest of the headers, we must await a
1912: 100-continue but first finish sending the request */
1913: k->exp100 = EXP100_SENDING_REQUEST;
1914:
1915: /* enable the write bit when we're not waiting for continue */
1916: k->keepon |= KEEP_SEND;
1917: }
1918: } /* if(writesockindex != -1) */
1919: } /* if(k->getheader || !data->set.opt_no_body) */
1920:
1921: }
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