1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
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 http://curl.haxx.se/docs/copyright.html.
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.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
23 #include "curl_setup.h"
25 #include "strtoofft.h"
29 #ifdef HAVE_NETINET_IN_H
30 #include <netinet/in.h>
35 #ifdef HAVE_ARPA_INET_H
36 #include <arpa/inet.h>
41 #ifdef HAVE_SYS_IOCTL_H
42 #include <sys/ioctl.h>
48 #ifdef HAVE_SYS_PARAM_H
49 #include <sys/param.h>
52 #ifdef HAVE_SYS_SELECT_H
53 #include <sys/select.h>
57 #error "We can't compile without socket() support!"
61 #include <curl/curl.h>
64 #include "content_encoding.h"
68 #include "speedcheck.h"
74 #include "http_digest.h"
75 #include "curl_ntlm.h"
76 #include "http_negotiate.h"
78 #include "curl_memory.h"
82 #include "non-ascii.h"
84 #define _MPRINTF_REPLACE /* use our functions only */
85 #include <curl/mprintf.h>
87 /* The last #include file should be: */
90 #define CURL_TIMEOUT_EXPECT_100 1000 /* counting ms here */
93 * This function will call the read callback to fill our buffer with data
96 CURLcode Curl_fillreadbuffer(struct connectdata *conn, int bytes, int *nreadp)
98 struct SessionHandle *data = conn->data;
99 size_t buffersize = (size_t)bytes;
101 #ifdef CURL_DOES_CONVERSIONS
102 bool sending_http_headers = FALSE;
104 if((conn->handler->protocol&(CURLPROTO_HTTP|CURLPROTO_RTSP)) &&
105 (data->state.proto.http->sending == HTTPSEND_REQUEST)) {
106 /* We're sending the HTTP request headers, not the data.
107 Remember that so we don't re-translate them into garbage. */
108 sending_http_headers = TRUE;
112 if(data->req.upload_chunky) {
113 /* if chunked Transfer-Encoding */
114 buffersize -= (8 + 2 + 2); /* 32bit hex + CRLF + CRLF */
115 data->req.upload_fromhere += (8 + 2); /* 32bit hex + CRLF */
118 /* this function returns a size_t, so we typecast to int to prevent warnings
119 with picky compilers */
120 nread = (int)conn->fread_func(data->req.upload_fromhere, 1,
121 buffersize, conn->fread_in);
123 if(nread == CURL_READFUNC_ABORT) {
124 failf(data, "operation aborted by callback");
126 return CURLE_ABORTED_BY_CALLBACK;
128 else if(nread == CURL_READFUNC_PAUSE) {
129 struct SingleRequest *k = &data->req;
130 /* CURL_READFUNC_PAUSE pauses read callbacks that feed socket writes */
131 k->keepon |= KEEP_SEND_PAUSE; /* mark socket send as paused */
132 if(data->req.upload_chunky) {
133 /* Back out the preallocation done above */
134 data->req.upload_fromhere -= (8 + 2);
137 return CURLE_OK; /* nothing was read */
139 else if((size_t)nread > buffersize) {
140 /* the read function returned a too large value */
142 failf(data, "read function returned funny value");
143 return CURLE_READ_ERROR;
146 if(!data->req.forbidchunk && data->req.upload_chunky) {
147 /* if chunked Transfer-Encoding
153 /* On non-ASCII platforms the <DATA> may or may not be
154 translated based on set.prefer_ascii while the protocol
155 portion must always be translated to the network encoding.
156 To further complicate matters, line end conversion might be
157 done later on, so we need to prevent CRLFs from becoming
158 CRCRLFs if that's the case. To do this we use bare LFs
159 here, knowing they'll become CRLFs later on.
163 const char *endofline_native;
164 const char *endofline_network;
168 #ifdef CURL_DO_LINEEND_CONV
169 (data->set.prefer_ascii) ||
172 /* \n will become \r\n later on */
173 endofline_native = "\n";
174 endofline_network = "\x0a";
177 endofline_native = "\r\n";
178 endofline_network = "\x0d\x0a";
180 hexlen = snprintf(hexbuffer, sizeof(hexbuffer),
181 "%x%s", nread, endofline_native);
183 /* move buffer pointer */
184 data->req.upload_fromhere -= hexlen;
187 /* copy the prefix to the buffer, leaving out the NUL */
188 memcpy(data->req.upload_fromhere, hexbuffer, hexlen);
190 /* always append ASCII CRLF to the data */
191 memcpy(data->req.upload_fromhere + nread,
193 strlen(endofline_network));
195 #ifdef CURL_DOES_CONVERSIONS
198 if(data->set.prefer_ascii) {
199 /* translate the protocol and data */
203 /* just translate the protocol portion */
204 length = strlen(hexbuffer);
206 res = Curl_convert_to_network(data, data->req.upload_fromhere, length);
207 /* Curl_convert_to_network calls failf if unsuccessful */
210 #endif /* CURL_DOES_CONVERSIONS */
212 if((nread - hexlen) == 0)
213 /* mark this as done once this chunk is transferred */
214 data->req.upload_done = TRUE;
216 nread+=(int)strlen(endofline_native); /* for the added end of line */
218 #ifdef CURL_DOES_CONVERSIONS
219 else if((data->set.prefer_ascii) && (!sending_http_headers)) {
221 res = Curl_convert_to_network(data, data->req.upload_fromhere, nread);
222 /* Curl_convert_to_network calls failf if unsuccessful */
226 #endif /* CURL_DOES_CONVERSIONS */
235 * Curl_readrewind() rewinds the read stream. This is typically used for HTTP
236 * POST/PUT with multi-pass authentication when a sending was denied and a
237 * resend is necessary.
239 CURLcode Curl_readrewind(struct connectdata *conn)
241 struct SessionHandle *data = conn->data;
243 conn->bits.rewindaftersend = FALSE; /* we rewind now */
245 /* explicitly switch off sending data on this connection now since we are
246 about to restart a new transfer and thus we want to avoid inadvertently
247 sending more data on the existing connection until the next transfer
249 data->req.keepon &= ~KEEP_SEND;
251 /* We have sent away data. If not using CURLOPT_POSTFIELDS or
252 CURLOPT_HTTPPOST, call app to rewind
254 if(data->set.postfields ||
255 (data->set.httpreq == HTTPREQ_POST_FORM))
258 if(data->set.seek_func) {
261 err = (data->set.seek_func)(data->set.seek_client, 0, SEEK_SET);
263 failf(data, "seek callback returned error %d", (int)err);
264 return CURLE_SEND_FAIL_REWIND;
267 else if(data->set.ioctl_func) {
270 err = (data->set.ioctl_func)(data, CURLIOCMD_RESTARTREAD,
271 data->set.ioctl_client);
272 infof(data, "the ioctl callback returned %d\n", (int)err);
275 /* FIXME: convert to a human readable error message */
276 failf(data, "ioctl callback returned error %d", (int)err);
277 return CURLE_SEND_FAIL_REWIND;
281 /* If no CURLOPT_READFUNCTION is used, we know that we operate on a
282 given FILE * stream and we can actually attempt to rewind that
283 ourselves with fseek() */
284 if(data->set.fread_func == (curl_read_callback)fread) {
285 if(-1 != fseek(data->set.in, 0, SEEK_SET))
286 /* successful rewind */
290 /* no callback set or failure above, makes us fail at once */
291 failf(data, "necessary data rewind wasn't possible");
292 return CURLE_SEND_FAIL_REWIND;
298 static int data_pending(const struct connectdata *conn)
300 /* in the case of libssh2, we can never be really sure that we have emptied
301 its internal buffers so we MUST always try until we get EAGAIN back */
302 return conn->handler->protocol&(CURLPROTO_SCP|CURLPROTO_SFTP) ||
303 Curl_ssl_data_pending(conn, FIRSTSOCKET);
306 static void read_rewind(struct connectdata *conn,
309 DEBUGASSERT(conn->read_pos >= thismuch);
311 conn->read_pos -= thismuch;
312 conn->bits.stream_was_rewound = TRUE;
319 show = CURLMIN(conn->buf_len - conn->read_pos, sizeof(buf)-1);
320 if(conn->master_buffer) {
321 memcpy(buf, conn->master_buffer + conn->read_pos, show);
328 DEBUGF(infof(conn->data,
329 "Buffer after stream rewind (read_pos = %zu): [%s]\n",
330 conn->read_pos, buf));
336 * Check to see if CURLOPT_TIMECONDITION was met by comparing the time of the
337 * remote document with the time provided by CURLOPT_TIMEVAL
339 bool Curl_meets_timecondition(struct SessionHandle *data, time_t timeofdoc)
341 if((timeofdoc == 0) || (data->set.timevalue == 0))
344 switch(data->set.timecondition) {
345 case CURL_TIMECOND_IFMODSINCE:
347 if(timeofdoc <= data->set.timevalue) {
349 "The requested document is not new enough\n");
350 data->info.timecond = TRUE;
354 case CURL_TIMECOND_IFUNMODSINCE:
355 if(timeofdoc >= data->set.timevalue) {
357 "The requested document is not old enough\n");
358 data->info.timecond = TRUE;
368 * Go ahead and do a read if we have a readable socket or if
369 * the stream was rewound (in which case we have data in a
372 static CURLcode readwrite_data(struct SessionHandle *data,
373 struct connectdata *conn,
374 struct SingleRequest *k,
375 int *didwhat, bool *done)
377 CURLcode result = CURLE_OK;
378 ssize_t nread; /* number of bytes read */
379 size_t excess = 0; /* excess bytes read */
380 bool is_empty_data = FALSE;
381 bool readmore = FALSE; /* used by RTP to signal for more data */
385 /* This is where we loop until we have read everything there is to
386 read or we get a CURLE_AGAIN */
388 size_t buffersize = data->set.buffer_size?
389 data->set.buffer_size : BUFSIZE;
390 size_t bytestoread = buffersize;
392 if(k->size != -1 && !k->header) {
393 /* make sure we don't read "too much" if we can help it since we
394 might be pipelining and then someone else might want to read what
396 curl_off_t totalleft = k->size - k->bytecount;
397 if(totalleft < (curl_off_t)bytestoread)
398 bytestoread = (size_t)totalleft;
402 /* receive data from the network! */
403 result = Curl_read(conn, conn->sockfd, k->buf, bytestoread, &nread);
405 /* read would've blocked */
406 if(CURLE_AGAIN == result)
407 break; /* get out of loop */
413 /* read nothing but since we wanted nothing we consider this an OK
414 situation to proceed from */
418 if((k->bytecount == 0) && (k->writebytecount == 0)) {
419 Curl_pgrsTime(data, TIMER_STARTTRANSFER);
420 if(k->exp100 > EXP100_SEND_DATA)
421 /* set time stamp to compare with when waiting for the 100 */
422 k->start100 = Curl_tvnow();
425 *didwhat |= KEEP_RECV;
426 /* indicates data of zero size, i.e. empty file */
427 is_empty_data = ((nread == 0) && (k->bodywrites == 0)) ? TRUE : FALSE;
429 /* NUL terminate, allowing string ops to be used */
430 if(0 < nread || is_empty_data) {
433 else if(0 >= nread) {
434 /* if we receive 0 or less here, the server closed the connection
435 and we bail out from this! */
436 DEBUGF(infof(data, "nread <= 0, server closed connection, bailing\n"));
437 k->keepon &= ~KEEP_RECV;
441 /* Default buffer to use when we write the buffer, it may be changed
442 in the flow below before the actual storing is done. */
445 if(conn->handler->readwrite) {
446 result = conn->handler->readwrite(data, conn, &nread, &readmore);
453 #ifndef CURL_DISABLE_HTTP
454 /* Since this is a two-state thing, we check if we are parsing
455 headers at the moment or not. */
457 /* we are in parse-the-header-mode */
458 bool stop_reading = FALSE;
459 result = Curl_http_readwrite_headers(data, conn, &nread, &stop_reading);
463 if(conn->handler->readwrite &&
464 (k->maxdownload <= 0 && nread > 0)) {
465 result = conn->handler->readwrite(data, conn, &nread, &readmore);
473 /* We've stopped dealing with input, get out of the do-while loop */
476 if(Curl_multi_pipeline_enabled(conn->data->multi)) {
478 "Rewinding stream by : %zd"
479 " bytes on url %s (zero-length body)\n",
480 nread, data->state.path);
481 read_rewind(conn, (size_t)nread);
485 "Excess found in a non pipelined read:"
487 " url = %s (zero-length body)\n",
488 nread, data->state.path);
495 #endif /* CURL_DISABLE_HTTP */
498 /* This is not an 'else if' since it may be a rest from the header
499 parsing, where the beginning of the buffer is headers and the end
501 if(k->str && !k->header && (nread > 0 || is_empty_data)) {
503 #ifndef CURL_DISABLE_HTTP
504 if(0 == k->bodywrites && !is_empty_data) {
505 /* These checks are only made the first time we are about to
506 write a piece of the body */
507 if(conn->handler->protocol&(CURLPROTO_HTTP|CURLPROTO_RTSP)) {
508 /* HTTP-only checks */
510 if(data->req.newurl) {
511 if(conn->bits.close) {
512 /* Abort after the headers if "follow Location" is set
513 and we're set to close anyway. */
514 k->keepon &= ~KEEP_RECV;
518 /* We have a new url to load, but since we want to be able
519 to re-use this connection properly, we read the full
520 response in "ignore more" */
521 k->ignorebody = TRUE;
522 infof(data, "Ignoring the response-body\n");
524 if(data->state.resume_from && !k->content_range &&
525 (data->set.httpreq==HTTPREQ_GET) &&
527 /* we wanted to resume a download, although the server doesn't
528 * seem to support this and we did this with a GET (if it
529 * wasn't a GET we did a POST or PUT resume) */
530 failf(data, "HTTP server doesn't seem to support "
531 "byte ranges. Cannot resume.");
532 return CURLE_RANGE_ERROR;
535 if(data->set.timecondition && !data->state.range) {
536 /* A time condition has been set AND no ranges have been
537 requested. This seems to be what chapter 13.3.4 of
538 RFC 2616 defines to be the correct action for a
541 if(!Curl_meets_timecondition(data, k->timeofdoc)) {
543 /* we abort the transfer before it is completed == we ruin the
544 re-use ability. Close the connection */
545 conn->bits.close = TRUE;
548 } /* we have a time condition */
550 } /* this is HTTP or RTSP */
551 } /* this is the first time we write a body part */
552 #endif /* CURL_DISABLE_HTTP */
556 /* pass data to the debug function before it gets "dechunked" */
557 if(data->set.verbose) {
559 Curl_debug(data, CURLINFO_DATA_IN, data->state.headerbuff,
560 (size_t)k->hbuflen, conn);
561 if(k->badheader == HEADER_PARTHEADER)
562 Curl_debug(data, CURLINFO_DATA_IN,
563 k->str, (size_t)nread, conn);
566 Curl_debug(data, CURLINFO_DATA_IN,
567 k->str, (size_t)nread, conn);
570 #ifndef CURL_DISABLE_HTTP
573 * Here comes a chunked transfer flying and we need to decode this
574 * properly. While the name says read, this function both reads
575 * and writes away the data. The returned 'nread' holds the number
576 * of actual data it wrote to the client.
580 Curl_httpchunk_read(conn, k->str, nread, &nread);
582 if(CHUNKE_OK < res) {
583 if(CHUNKE_WRITE_ERROR == res) {
584 failf(data, "Failed writing data");
585 return CURLE_WRITE_ERROR;
587 failf(data, "Problem (%d) in the Chunked-Encoded data", (int)res);
588 return CURLE_RECV_ERROR;
590 else if(CHUNKE_STOP == res) {
592 /* we're done reading chunks! */
593 k->keepon &= ~KEEP_RECV; /* read no more */
595 /* There are now possibly N number of bytes at the end of the
596 str buffer that weren't written to the client.
598 We DO care about this data if we are pipelining.
599 Push it back to be read on the next pass. */
601 dataleft = conn->chunk.dataleft;
603 infof(conn->data, "Leftovers after chunking: %zu bytes\n",
605 if(Curl_multi_pipeline_enabled(conn->data->multi)) {
606 /* only attempt the rewind if we truly are pipelining */
607 infof(conn->data, "Rewinding %zu bytes\n",dataleft);
608 read_rewind(conn, dataleft);
612 /* If it returned OK, we just keep going */
614 #endif /* CURL_DISABLE_HTTP */
616 /* Account for body content stored in the header buffer */
617 if(k->badheader && !k->ignorebody) {
618 DEBUGF(infof(data, "Increasing bytecount by %zu from hbuflen\n",
620 k->bytecount += k->hbuflen;
623 if((-1 != k->maxdownload) &&
624 (k->bytecount + nread >= k->maxdownload)) {
626 excess = (size_t)(k->bytecount + nread - k->maxdownload);
627 if(excess > 0 && !k->ignorebody) {
628 if(Curl_multi_pipeline_enabled(conn->data->multi)) {
629 /* The 'excess' amount below can't be more than BUFSIZE which
630 always will fit in a size_t */
632 "Rewinding stream by : %zu"
633 " bytes on url %s (size = %" FORMAT_OFF_T
634 ", maxdownload = %" FORMAT_OFF_T
635 ", bytecount = %" FORMAT_OFF_T ", nread = %zd)\n",
636 excess, data->state.path,
637 k->size, k->maxdownload, k->bytecount, nread);
638 read_rewind(conn, excess);
642 "Excess found in a non pipelined read:"
644 ", size = %" FORMAT_OFF_T
645 ", maxdownload = %" FORMAT_OFF_T
646 ", bytecount = %" FORMAT_OFF_T "\n",
647 excess, k->size, k->maxdownload, k->bytecount);
651 nread = (ssize_t) (k->maxdownload - k->bytecount);
652 if(nread < 0 ) /* this should be unusual */
655 k->keepon &= ~KEEP_RECV; /* we're done reading */
658 k->bytecount += nread;
660 Curl_pgrsSetDownloadCounter(data, k->bytecount);
662 if(!k->chunk && (nread || k->badheader || is_empty_data)) {
663 /* If this is chunky transfer, it was already written */
665 if(k->badheader && !k->ignorebody) {
666 /* we parsed a piece of data wrongly assuming it was a header
667 and now we output it as body instead */
669 /* Don't let excess data pollute body writes */
670 if(k->maxdownload == -1 || (curl_off_t)k->hbuflen <= k->maxdownload)
671 result = Curl_client_write(conn, CLIENTWRITE_BODY,
672 data->state.headerbuff,
675 result = Curl_client_write(conn, CLIENTWRITE_BODY,
676 data->state.headerbuff,
677 (size_t)k->maxdownload);
682 if(k->badheader < HEADER_ALLBAD) {
683 /* This switch handles various content encodings. If there's an
684 error here, be sure to check over the almost identical code
686 Make sure that ALL_CONTENT_ENCODINGS contains all the
687 encodings handled here. */
689 switch (conn->data->set.http_ce_skip ?
690 IDENTITY : k->auto_decoding) {
693 /* This is the default when the server sends no
694 Content-Encoding header. See Curl_readwrite_init; the
695 memset() call initializes k->auto_decoding to zero. */
698 #ifndef CURL_DISABLE_POP3
699 if(conn->handler->protocol&CURLPROTO_POP3)
700 result = Curl_pop3_write(conn, k->str, nread);
702 #endif /* CURL_DISABLE_POP3 */
704 result = Curl_client_write(conn, CLIENTWRITE_BODY, k->str,
711 /* Assume CLIENTWRITE_BODY; headers are not encoded. */
713 result = Curl_unencode_deflate_write(conn, k, nread);
717 /* Assume CLIENTWRITE_BODY; headers are not encoded. */
719 result = Curl_unencode_gzip_write(conn, k, nread);
724 failf (data, "Unrecognized content encoding type. "
725 "libcurl understands `identity', `deflate' and `gzip' "
726 "content encodings.");
727 result = CURLE_BAD_CONTENT_ENCODING;
732 k->badheader = HEADER_NORMAL; /* taken care of now */
738 } /* if(! header and data to read ) */
740 if(conn->handler->readwrite &&
741 (excess > 0 && !conn->bits.stream_was_rewound)) {
742 /* Parse the excess data */
744 nread = (ssize_t)excess;
746 result = conn->handler->readwrite(data, conn, &nread, &readmore);
751 k->keepon |= KEEP_RECV; /* we're not done reading */
756 /* if we received nothing, the server closed the connection and we
758 k->keepon &= ~KEEP_RECV;
761 } while(data_pending(conn));
763 if(((k->keepon & (KEEP_RECV|KEEP_SEND)) == KEEP_SEND) &&
765 /* When we've read the entire thing and the close bit is set, the server
766 may now close the connection. If there's now any kind of sending going
767 on from our side, we need to stop that immediately. */
768 infof(data, "we are done reading and this is set to close, stop send\n");
769 k->keepon &= ~KEEP_SEND; /* no writing anymore either */
776 * Send data to upload to the server, when the socket is writable.
778 static CURLcode readwrite_upload(struct SessionHandle *data,
779 struct connectdata *conn,
780 struct SingleRequest *k,
784 ssize_t bytes_written;
786 ssize_t nread; /* number of bytes read */
787 bool sending_http_headers = FALSE;
789 if((k->bytecount == 0) && (k->writebytecount == 0))
790 Curl_pgrsTime(data, TIMER_STARTTRANSFER);
792 *didwhat |= KEEP_SEND;
795 * We loop here to do the READ and SEND loop until we run out of
796 * data to send or until we get EWOULDBLOCK back
798 * FIXME: above comment is misleading. Currently no looping is
799 * actually done in do-while loop below.
803 /* only read more data if there's no upload data already
804 present in the upload buffer */
805 if(0 == data->req.upload_present) {
806 /* init the "upload from here" pointer */
807 data->req.upload_fromhere = k->uploadbuf;
809 if(!k->upload_done) {
810 /* HTTP pollution, this should be written nicer to become more
811 protocol agnostic. */
814 if((k->exp100 == EXP100_SENDING_REQUEST) &&
815 (data->state.proto.http->sending == HTTPSEND_BODY)) {
816 /* If this call is to send body data, we must take some action:
817 We have sent off the full HTTP 1.1 request, and we shall now
818 go into the Expect: 100 state and await such a header */
819 k->exp100 = EXP100_AWAITING_CONTINUE; /* wait for the header */
820 k->keepon &= ~KEEP_SEND; /* disable writing */
821 k->start100 = Curl_tvnow(); /* timeout count starts now */
822 *didwhat &= ~KEEP_SEND; /* we didn't write anything actually */
824 /* set a timeout for the multi interface */
825 Curl_expire(data, CURL_TIMEOUT_EXPECT_100);
829 if(conn->handler->protocol&(CURLPROTO_HTTP|CURLPROTO_RTSP)) {
830 if(data->state.proto.http->sending == HTTPSEND_REQUEST)
831 /* We're sending the HTTP request headers, not the data.
832 Remember that so we don't change the line endings. */
833 sending_http_headers = TRUE;
835 sending_http_headers = FALSE;
838 result = Curl_fillreadbuffer(conn, BUFSIZE, &fillcount);
842 nread = (ssize_t)fillcount;
845 nread = 0; /* we're done uploading/reading */
847 if(!nread && (k->keepon & KEEP_SEND_PAUSE)) {
848 /* this is a paused transfer */
853 k->keepon &= ~KEEP_SEND; /* we're done writing */
855 if(conn->bits.rewindaftersend) {
856 result = Curl_readrewind(conn);
863 /* store number of bytes available for upload */
864 data->req.upload_present = nread;
866 #ifndef CURL_DISABLE_SMTP
867 if(conn->handler->protocol & CURLPROTO_SMTP) {
868 result = Curl_smtp_escape_eob(conn, nread);
873 #endif /* CURL_DISABLE_SMTP */
875 /* convert LF to CRLF if so asked */
876 if((!sending_http_headers) && (
877 #ifdef CURL_DO_LINEEND_CONV
878 /* always convert if we're FTPing in ASCII mode */
879 (data->set.prefer_ascii) ||
882 if(data->state.scratch == NULL)
883 data->state.scratch = malloc(2*BUFSIZE);
884 if(data->state.scratch == NULL) {
885 failf (data, "Failed to alloc scratch buffer!");
886 return CURLE_OUT_OF_MEMORY;
889 * ASCII/EBCDIC Note: This is presumably a text (not binary)
890 * transfer so the data should already be in ASCII.
891 * That means the hex values for ASCII CR (0x0d) & LF (0x0a)
892 * must be used instead of the escape sequences \r & \n.
894 for(i = 0, si = 0; i < nread; i++, si++) {
895 if(data->req.upload_fromhere[i] == 0x0a) {
896 data->state.scratch[si++] = 0x0d;
897 data->state.scratch[si] = 0x0a;
898 if(!data->set.crlf) {
899 /* we're here only because FTP is in ASCII mode...
900 bump infilesize for the LF we just added */
901 data->set.infilesize++;
905 data->state.scratch[si] = data->req.upload_fromhere[i];
908 /* only perform the special operation if we really did replace
912 /* upload from the new (replaced) buffer instead */
913 data->req.upload_fromhere = data->state.scratch;
915 /* set the new amount too */
916 data->req.upload_present = nread;
919 } /* if 0 == data->req.upload_present */
921 /* We have a partial buffer left from a previous "round". Use
922 that instead of reading more data */
925 /* write to socket (send away data) */
926 result = Curl_write(conn,
927 conn->writesockfd, /* socket to send to */
928 data->req.upload_fromhere, /* buffer pointer */
929 data->req.upload_present, /* buffer size */
930 &bytes_written); /* actually sent */
935 if(data->set.verbose)
936 /* show the data before we change the pointer upload_fromhere */
937 Curl_debug(data, CURLINFO_DATA_OUT, data->req.upload_fromhere,
938 (size_t)bytes_written, conn);
940 k->writebytecount += bytes_written;
942 if(k->writebytecount == data->set.infilesize) {
943 /* we have sent all data we were supposed to */
944 k->upload_done = TRUE;
945 infof(data, "We are completely uploaded and fine\n");
948 if(data->req.upload_present != bytes_written) {
949 /* we only wrote a part of the buffer (if anything), deal with it! */
951 /* store the amount of bytes left in the buffer to write */
952 data->req.upload_present -= bytes_written;
954 /* advance the pointer where to find the buffer when the next send
956 data->req.upload_fromhere += bytes_written;
959 /* we've uploaded that buffer now */
960 data->req.upload_fromhere = k->uploadbuf;
961 data->req.upload_present = 0; /* no more bytes left */
964 /* switch off writing, we're done! */
965 k->keepon &= ~KEEP_SEND; /* we're done writing */
969 Curl_pgrsSetUploadCounter(data, k->writebytecount);
971 } WHILE_FALSE; /* just to break out from! */
977 * Curl_readwrite() is the low-level function to be called when data is to
978 * be read and written to/from the connection.
980 CURLcode Curl_readwrite(struct connectdata *conn,
983 struct SessionHandle *data = conn->data;
984 struct SingleRequest *k = &data->req;
988 curl_socket_t fd_read;
989 curl_socket_t fd_write;
990 int select_res = conn->cselect_bits;
992 conn->cselect_bits = 0;
994 /* only use the proper socket if the *_HOLD bit is not set simultaneously as
995 then we are in rate limiting state in that transfer direction */
997 if((k->keepon & KEEP_RECVBITS) == KEEP_RECV)
998 fd_read = conn->sockfd;
1000 fd_read = CURL_SOCKET_BAD;
1002 if((k->keepon & KEEP_SENDBITS) == KEEP_SEND)
1003 fd_write = conn->writesockfd;
1005 fd_write = CURL_SOCKET_BAD;
1007 if(!select_res) /* Call for select()/poll() only, if read/write/error
1008 status is not known. */
1009 select_res = Curl_socket_ready(fd_read, fd_write, 0);
1011 if(select_res == CURL_CSELECT_ERR) {
1012 failf(data, "select/poll returned error");
1013 return CURLE_SEND_ERROR;
1016 /* We go ahead and do a read if we have a readable socket or if
1017 the stream was rewound (in which case we have data in a
1019 if((k->keepon & KEEP_RECV) &&
1020 ((select_res & CURL_CSELECT_IN) || conn->bits.stream_was_rewound)) {
1022 result = readwrite_data(data, conn, k, &didwhat, done);
1027 /* If we still have writing to do, we check if we have a writable socket. */
1028 if((k->keepon & KEEP_SEND) && (select_res & CURL_CSELECT_OUT)) {
1031 result = readwrite_upload(data, conn, k, &didwhat);
1036 k->now = Curl_tvnow();
1038 /* Update read/write counters */
1040 *k->bytecountp = k->bytecount; /* read count */
1041 if(k->writebytecountp)
1042 *k->writebytecountp = k->writebytecount; /* write count */
1045 /* no read no write, this is a timeout? */
1046 if(k->exp100 == EXP100_AWAITING_CONTINUE) {
1047 /* This should allow some time for the header to arrive, but only a
1048 very short time as otherwise it'll be too much wasted time too
1051 /* Quoting RFC2616, section "8.2.3 Use of the 100 (Continue) Status":
1053 Therefore, when a client sends this header field to an origin server
1054 (possibly via a proxy) from which it has never seen a 100 (Continue)
1055 status, the client SHOULD NOT wait for an indefinite period before
1056 sending the request body.
1060 long ms = Curl_tvdiff(k->now, k->start100);
1061 if(ms > CURL_TIMEOUT_EXPECT_100) {
1062 /* we've waited long enough, continue anyway */
1063 k->exp100 = EXP100_SEND_DATA;
1064 k->keepon |= KEEP_SEND;
1065 infof(data, "Done waiting for 100-continue\n");
1070 if(Curl_pgrsUpdate(conn))
1071 result = CURLE_ABORTED_BY_CALLBACK;
1073 result = Curl_speedcheck(data, k->now);
1078 if(0 > Curl_timeleft(data, &k->now, FALSE)) {
1080 failf(data, "Operation timed out after %ld milliseconds with %"
1081 FORMAT_OFF_T " out of %" FORMAT_OFF_T " bytes received",
1082 Curl_tvdiff(k->now, data->progress.t_startsingle), k->bytecount,
1086 failf(data, "Operation timed out after %ld milliseconds with %"
1087 FORMAT_OFF_T " bytes received",
1088 Curl_tvdiff(k->now, data->progress.t_startsingle), k->bytecount);
1090 return CURLE_OPERATION_TIMEDOUT;
1095 * The transfer has been performed. Just make some general checks before
1099 if(!(data->set.opt_no_body) && (k->size != -1) &&
1100 (k->bytecount != k->size) &&
1101 #ifdef CURL_DO_LINEEND_CONV
1102 /* Most FTP servers don't adjust their file SIZE response for CRLFs,
1103 so we'll check to see if the discrepancy can be explained
1104 by the number of CRLFs we've changed to LFs.
1106 (k->bytecount != (k->size + data->state.crlf_conversions)) &&
1107 #endif /* CURL_DO_LINEEND_CONV */
1108 !data->req.newurl) {
1109 failf(data, "transfer closed with %" FORMAT_OFF_T
1110 " bytes remaining to read",
1111 k->size - k->bytecount);
1112 return CURLE_PARTIAL_FILE;
1114 else if(!(data->set.opt_no_body) &&
1116 (conn->chunk.state != CHUNK_STOP)) {
1118 * In chunked mode, return an error if the connection is closed prior to
1119 * the empty (terminating) chunk is read.
1121 * The condition above used to check for
1122 * conn->proto.http->chunk.datasize != 0 which is true after reading
1123 * *any* chunk, not just the empty chunk.
1126 failf(data, "transfer closed with outstanding read data remaining");
1127 return CURLE_PARTIAL_FILE;
1129 if(Curl_pgrsUpdate(conn))
1130 return CURLE_ABORTED_BY_CALLBACK;
1133 /* Now update the "done" boolean we return */
1134 *done = (0 == (k->keepon&(KEEP_RECV|KEEP_SEND|
1135 KEEP_RECV_PAUSE|KEEP_SEND_PAUSE))) ? TRUE : FALSE;
1141 * Curl_single_getsock() gets called by the multi interface code when the app
1142 * has requested to get the sockets for the current connection. This function
1143 * will then be called once for every connection that the multi interface
1144 * keeps track of. This function will only be called for connections that are
1145 * in the proper state to have this information available.
1147 int Curl_single_getsock(const struct connectdata *conn,
1148 curl_socket_t *sock, /* points to numsocks number
1152 const struct SessionHandle *data = conn->data;
1153 int bitmap = GETSOCK_BLANK;
1154 unsigned sockindex = 0;
1156 if(conn->handler->perform_getsock)
1157 return conn->handler->perform_getsock(conn, sock, numsocks);
1160 /* simple check but we might need two slots */
1161 return GETSOCK_BLANK;
1163 /* don't include HOLD and PAUSE connections */
1164 if((data->req.keepon & KEEP_RECVBITS) == KEEP_RECV) {
1166 DEBUGASSERT(conn->sockfd != CURL_SOCKET_BAD);
1168 bitmap |= GETSOCK_READSOCK(sockindex);
1169 sock[sockindex] = conn->sockfd;
1172 /* don't include HOLD and PAUSE connections */
1173 if((data->req.keepon & KEEP_SENDBITS) == KEEP_SEND) {
1175 if((conn->sockfd != conn->writesockfd) ||
1176 !(data->req.keepon & KEEP_RECV)) {
1177 /* only if they are not the same socket or we didn't have a readable
1178 one, we increase index */
1179 if(data->req.keepon & KEEP_RECV)
1180 sockindex++; /* increase index if we need two entries */
1182 DEBUGASSERT(conn->writesockfd != CURL_SOCKET_BAD);
1184 sock[sockindex] = conn->writesockfd;
1187 bitmap |= GETSOCK_WRITESOCK(sockindex);
1194 * Determine optimum sleep time based on configured rate, current rate,
1196 * Returns value in milliseconds.
1198 * The basic idea is to adjust the desired rate up/down in this method
1199 * based on whether we are running too slow or too fast. Then, calculate
1200 * how many milliseconds to wait for the next packet to achieve this new
1203 long Curl_sleep_time(curl_off_t rate_bps, curl_off_t cur_rate_bps,
1206 curl_off_t min_sleep = 0;
1212 /* If running faster than about .1% of the desired speed, slow
1213 * us down a bit. Use shift instead of division as the 0.1%
1214 * cutoff is arbitrary anyway.
1216 if(cur_rate_bps > (rate_bps + (rate_bps >> 10))) {
1217 /* running too fast, decrease target rate by 1/64th of rate */
1218 rate_bps -= rate_bps >> 6;
1221 else if(cur_rate_bps < (rate_bps - (rate_bps >> 10))) {
1222 /* running too slow, increase target rate by 1/64th of rate */
1223 rate_bps += rate_bps >> 6;
1226 /* Determine number of milliseconds to wait until we do
1227 * the next packet at the adjusted rate. We should wait
1228 * longer when using larger packets, for instance.
1230 rv = ((curl_off_t)((pkt_size * 8) * 1000) / rate_bps);
1232 /* Catch rounding errors and always slow down at least 1ms if
1233 * we are running too fast.
1238 /* Bound value to fit in 'long' on 32-bit platform. That's
1239 * plenty long enough anyway!
1248 * Curl_pretransfer() is called immediately before a transfer starts.
1250 CURLcode Curl_pretransfer(struct SessionHandle *data)
1253 if(!data->change.url) {
1254 /* we can't do anything without URL */
1255 failf(data, "No URL set!");
1256 return CURLE_URL_MALFORMAT;
1259 /* Init the SSL session ID cache here. We do it here since we want to do it
1260 after the *_setopt() calls (that could specify the size of the cache) but
1261 before any transfer takes place. */
1262 res = Curl_ssl_initsessions(data, data->set.ssl.max_ssl_sessions);
1266 data->set.followlocation=0; /* reset the location-follow counter */
1267 data->state.this_is_a_follow = FALSE; /* reset this */
1268 data->state.errorbuf = FALSE; /* no error has occurred */
1269 data->state.httpversion = 0; /* don't assume any particular server version */
1271 data->state.ssl_connect_retry = FALSE;
1273 data->state.authproblem = FALSE;
1274 data->state.authhost.want = data->set.httpauth;
1275 data->state.authproxy.want = data->set.proxyauth;
1276 Curl_safefree(data->info.wouldredirect);
1277 data->info.wouldredirect = NULL;
1279 /* If there is a list of cookie files to read, do it now! */
1280 if(data->change.cookielist)
1281 Curl_cookie_loadfiles(data);
1283 /* If there is a list of host pairs to deal with */
1284 if(data->change.resolve)
1285 res = Curl_loadhostpairs(data);
1288 /* Allow data->set.use_port to set which port to use. This needs to be
1289 * disabled for example when we follow Location: headers to URLs using
1290 * different ports! */
1291 data->state.allow_port = TRUE;
1293 #if defined(HAVE_SIGNAL) && defined(SIGPIPE) && !defined(HAVE_MSG_NOSIGNAL)
1294 /*************************************************************
1295 * Tell signal handler to ignore SIGPIPE
1296 *************************************************************/
1297 if(!data->set.no_signal)
1298 data->state.prev_signal = signal(SIGPIPE, SIG_IGN);
1301 Curl_initinfo(data); /* reset session-specific information "variables" */
1302 Curl_pgrsStartNow(data);
1304 if(data->set.timeout)
1305 Curl_expire(data, data->set.timeout);
1307 if(data->set.connecttimeout)
1308 Curl_expire(data, data->set.connecttimeout);
1310 /* In case the handle is re-used and an authentication method was picked
1311 in the session we need to make sure we only use the one(s) we now
1312 consider to be fine */
1313 data->state.authhost.picked &= data->state.authhost.want;
1314 data->state.authproxy.picked &= data->state.authproxy.want;
1321 * Curl_posttransfer() is called immediately after a transfer ends
1323 CURLcode Curl_posttransfer(struct SessionHandle *data)
1325 #if defined(HAVE_SIGNAL) && defined(SIGPIPE) && !defined(HAVE_MSG_NOSIGNAL)
1326 /* restore the signal handler for SIGPIPE before we get back */
1327 if(!data->set.no_signal)
1328 signal(SIGPIPE, data->state.prev_signal);
1330 (void)data; /* unused parameter */
1336 #ifndef CURL_DISABLE_HTTP
1338 * strlen_url() returns the length of the given URL if the spaces within the
1339 * URL were properly URL encoded.
1341 static size_t strlen_url(const char *url)
1345 bool left=TRUE; /* left side of the ? */
1347 for(ptr=url; *ptr; ptr++) {
1366 /* strcpy_url() copies a url to a output buffer and URL-encodes the spaces in
1367 * the source URL accordingly.
1369 static void strcpy_url(char *output, const char *url)
1371 /* we must add this with whitespace-replacing */
1374 char *optr = output;
1375 for(iptr = url; /* read from here */
1376 *iptr; /* until zero byte */
1387 *optr++='%'; /* add a '%' */
1388 *optr++='2'; /* add a '2' */
1389 *optr++='0'; /* add a '0' */
1392 *optr++='+'; /* add a '+' here */
1396 *optr=0; /* zero terminate output buffer */
1401 * Returns true if the given URL is absolute (as opposed to relative)
1403 static bool is_absolute_url(const char *url)
1405 char prot[16]; /* URL protocol string storage */
1406 char letter; /* used for a silly sscanf */
1408 return (2 == sscanf(url, "%15[^?&/:]://%c", prot, &letter)) ? TRUE : FALSE;
1412 * Concatenate a relative URL to a base URL making it absolute.
1413 * URL-encodes any spaces.
1414 * The returned pointer must be freed by the caller unless NULL
1415 * (returns NULL on out of memory).
1417 static char *concat_url(const char *base, const char *relurl)
1420 TRY to append this new path to the old URL
1421 to the right of the host part. Oh crap, this is doomed to cause
1422 problems in the future...
1429 const char *useurl = relurl;
1432 /* we must make our own copy of the URL to play with, as it may
1433 point to read-only data */
1434 char *url_clone=strdup(base);
1437 return NULL; /* skip out of this NOW */
1439 /* protsep points to the start of the host name */
1440 protsep=strstr(url_clone, "//");
1444 protsep+=2; /* pass the slashes */
1446 if('/' != relurl[0]) {
1449 /* First we need to find out if there's a ?-letter in the URL,
1450 and cut it and the right-side of that off */
1451 pathsep = strchr(protsep, '?');
1455 /* we have a relative path to append to the last slash if there's one
1456 available, or if the new URL is just a query string (starts with a
1457 '?') we append the new one at the end of the entire currently worked
1459 if(useurl[0] != '?') {
1460 pathsep = strrchr(protsep, '/');
1465 /* Check if there's any slash after the host name, and if so, remember
1466 that position instead */
1467 pathsep = strchr(protsep, '/');
1469 protsep = pathsep+1;
1473 /* now deal with one "./" or any amount of "../" in the newurl
1474 and act accordingly */
1476 if((useurl[0] == '.') && (useurl[1] == '/'))
1477 useurl+=2; /* just skip the "./" */
1479 while((useurl[0] == '.') &&
1480 (useurl[1] == '.') &&
1481 (useurl[2] == '/')) {
1483 useurl+=3; /* pass the "../" */
1488 /* cut off one more level from the right of the original URL */
1489 pathsep = strrchr(protsep, '/');
1500 /* We got a new absolute path for this server */
1502 if((relurl[0] == '/') && (relurl[1] == '/')) {
1503 /* the new URL starts with //, just keep the protocol part from the
1506 useurl = &relurl[2]; /* we keep the slashes from the original, so we
1507 skip the new ones */
1510 /* cut off the original URL from the first slash, or deal with URLs
1512 pathsep = strchr(protsep, '/');
1514 /* When people use badly formatted URLs, such as
1515 "http://www.url.com?dir=/home/daniel" we must not use the first
1516 slash, if there's a ?-letter before it! */
1517 char *sep = strchr(protsep, '?');
1518 if(sep && (sep < pathsep))
1523 /* There was no slash. Now, since we might be operating on a badly
1524 formatted URL, such as "http://www.url.com?id=2380" which doesn't
1525 use a slash separator as it is supposed to, we need to check for a
1526 ?-letter as well! */
1527 pathsep = strchr(protsep, '?');
1534 /* If the new part contains a space, this is a mighty stupid redirect
1535 but we still make an effort to do "right". To the left of a '?'
1536 letter we replace each space with %20 while it is replaced with '+'
1537 on the right side of the '?' letter.
1539 newlen = strlen_url(useurl);
1541 urllen = strlen(url_clone);
1543 newest = malloc(urllen + 1 + /* possible slash */
1544 newlen + 1 /* zero byte */);
1547 free(url_clone); /* don't leak this */
1551 /* copy over the root url part */
1552 memcpy(newest, url_clone, urllen);
1554 /* check if we need to append a slash */
1555 if(('/' == useurl[0]) || (protsep && !*protsep) || ('?' == useurl[0]))
1558 newest[urllen++]='/';
1560 /* then append the new piece on the right side */
1561 strcpy_url(&newest[urllen], useurl);
1567 #endif /* CURL_DISABLE_HTTP */
1570 * Curl_follow() handles the URL redirect magic. Pass in the 'newurl' string
1571 * as given by the remote server and set up the new URL to request.
1573 CURLcode Curl_follow(struct SessionHandle *data,
1574 char *newurl, /* this 'newurl' is the Location: string,
1575 and it must be malloc()ed before passed
1577 followtype type) /* see transfer.h */
1579 #ifdef CURL_DISABLE_HTTP
1583 /* Location: following will not happen when HTTP is disabled */
1584 return CURLE_TOO_MANY_REDIRECTS;
1587 /* Location: redirect */
1588 bool disallowport = FALSE;
1590 if(type == FOLLOW_REDIR) {
1591 if((data->set.maxredirs != -1) &&
1592 (data->set.followlocation >= data->set.maxredirs)) {
1593 failf(data,"Maximum (%ld) redirects followed", data->set.maxredirs);
1594 return CURLE_TOO_MANY_REDIRECTS;
1597 /* mark the next request as a followed location: */
1598 data->state.this_is_a_follow = TRUE;
1600 data->set.followlocation++; /* count location-followers */
1602 if(data->set.http_auto_referer) {
1603 /* We are asked to automatically set the previous URL as the referer
1604 when we get the next URL. We pick the ->url field, which may or may
1605 not be 100% correct */
1607 if(data->change.referer_alloc) {
1608 Curl_safefree(data->change.referer);
1609 data->change.referer_alloc = FALSE;
1612 data->change.referer = strdup(data->change.url);
1613 if(!data->change.referer)
1614 return CURLE_OUT_OF_MEMORY;
1615 data->change.referer_alloc = TRUE; /* yes, free this later */
1619 if(!is_absolute_url(newurl)) {
1621 *DANG* this is an RFC 2068 violation. The URL is supposed
1622 to be absolute and this doesn't seem to be that!
1624 char *absolute = concat_url(data->change.url, newurl);
1626 return CURLE_OUT_OF_MEMORY;
1631 /* This is an absolute URL, don't allow the custom port number */
1632 disallowport = TRUE;
1634 if(strchr(newurl, ' ')) {
1635 /* This new URL contains at least one space, this is a mighty stupid
1636 redirect but we still make an effort to do "right". */
1638 size_t newlen = strlen_url(newurl);
1640 newest = malloc(newlen+1); /* get memory for this */
1642 return CURLE_OUT_OF_MEMORY;
1643 strcpy_url(newest, newurl); /* create a space-free URL */
1645 free(newurl); /* that was no good */
1646 newurl = newest; /* use this instead now */
1651 if(type == FOLLOW_FAKE) {
1652 /* we're only figuring out the new url if we would've followed locations
1653 but now we're done so we can get out! */
1654 data->info.wouldredirect = newurl;
1659 data->state.allow_port = FALSE;
1661 if(data->change.url_alloc) {
1662 Curl_safefree(data->change.url);
1663 data->change.url_alloc = FALSE;
1666 data->change.url = newurl;
1667 data->change.url_alloc = TRUE;
1668 newurl = NULL; /* don't free! */
1670 infof(data, "Issue another request to this URL: '%s'\n", data->change.url);
1673 * We get here when the HTTP code is 300-399 (and 401). We need to perform
1674 * differently based on exactly what return code there was.
1676 * News from 7.10.6: we can also get here on a 401 or 407, in case we act on
1677 * a HTTP (proxy-) authentication scheme other than Basic.
1679 switch(data->info.httpcode) {
1680 /* 401 - Act on a WWW-Authenticate, we keep on moving and do the
1681 Authorization: XXXX header in the HTTP request code snippet */
1682 /* 407 - Act on a Proxy-Authenticate, we keep on moving and do the
1683 Proxy-Authorization: XXXX header in the HTTP request code snippet */
1684 /* 300 - Multiple Choices */
1685 /* 306 - Not used */
1686 /* 307 - Temporary Redirect */
1687 default: /* for all above (and the unknown ones) */
1688 /* Some codes are explicitly mentioned since I've checked RFC2616 and they
1689 * seem to be OK to POST to.
1692 case 301: /* Moved Permanently */
1693 /* (quote from RFC2616, section 10.3.2):
1695 * When automatically redirecting a POST request after receiving a 301
1696 * status code, some existing HTTP/1.0 user agents will erroneously change
1697 * it into a GET request.
1701 * As most of the important user agents do this obvious RFC2616 violation,
1702 * many webservers expect this. So these servers often answers to a POST
1703 * request with an error page. To be sure that libcurl gets the page that
1704 * most user agents would get, libcurl has to force GET.
1706 * This behavior can be overridden with CURLOPT_POSTREDIR.
1708 if((data->set.httpreq == HTTPREQ_POST
1709 || data->set.httpreq == HTTPREQ_POST_FORM)
1710 && !(data->set.keep_post & CURL_REDIR_POST_301)) {
1712 "Violate RFC 2616/10.3.2 and switch from POST to GET\n");
1713 data->set.httpreq = HTTPREQ_GET;
1716 case 302: /* Found */
1719 Note: RFC 1945 and RFC 2068 specify that the client is not allowed
1720 to change the method on the redirected request. However, most
1721 existing user agent implementations treat 302 as if it were a 303
1722 response, performing a GET on the Location field-value regardless
1723 of the original request method. The status codes 303 and 307 have
1724 been added for servers that wish to make unambiguously clear which
1725 kind of reaction is expected of the client.
1729 Note: Many pre-HTTP/1.1 user agents do not understand the 303
1730 status. When interoperability with such clients is a concern, the
1731 302 status code may be used instead, since most user agents react
1732 to a 302 response as described here for 303.
1734 This behavior can be overridden with CURLOPT_POSTREDIR
1736 if((data->set.httpreq == HTTPREQ_POST
1737 || data->set.httpreq == HTTPREQ_POST_FORM)
1738 && !(data->set.keep_post & CURL_REDIR_POST_302)) {
1740 "Violate RFC 2616/10.3.3 and switch from POST to GET\n");
1741 data->set.httpreq = HTTPREQ_GET;
1745 case 303: /* See Other */
1746 /* Disable both types of POSTs, unless the user explicitely
1747 asks for POST after POST */
1748 if(data->set.httpreq != HTTPREQ_GET
1749 && !(data->set.keep_post & CURL_REDIR_POST_303)) {
1750 data->set.httpreq = HTTPREQ_GET; /* enforce GET request */
1751 infof(data, "Disables POST, goes with %s\n",
1752 data->set.opt_no_body?"HEAD":"GET");
1755 case 304: /* Not Modified */
1756 /* 304 means we did a conditional request and it was "Not modified".
1757 * We shouldn't get any Location: header in this response!
1760 case 305: /* Use Proxy */
1761 /* (quote from RFC2616, section 10.3.6):
1762 * "The requested resource MUST be accessed through the proxy given
1763 * by the Location field. The Location field gives the URI of the
1764 * proxy. The recipient is expected to repeat this single request
1765 * via the proxy. 305 responses MUST only be generated by origin
1770 Curl_pgrsTime(data, TIMER_REDIRECT);
1771 Curl_pgrsResetTimesSizes(data);
1774 #endif /* CURL_DISABLE_HTTP */
1778 Curl_reconnect_request(struct connectdata **connp)
1780 CURLcode result = CURLE_OK;
1781 struct connectdata *conn = *connp;
1782 struct SessionHandle *data = conn->data;
1784 /* This was a re-use of a connection and we got a write error in the
1785 * DO-phase. Then we DISCONNECT this connection and have another attempt to
1786 * CONNECT and then DO again! The retry cannot possibly find another
1787 * connection to re-use, since we only keep one possible connection for
1790 infof(data, "Re-used connection seems dead, get a new one\n");
1792 conn->bits.close = TRUE; /* enforce close of this connection */
1793 result = Curl_done(&conn, result, FALSE); /* we are so done with this */
1795 /* conn may no longer be a good pointer, clear it to avoid mistakes by
1800 * According to bug report #1330310. We need to check for CURLE_SEND_ERROR
1801 * here as well. I figure this could happen when the request failed on a FTP
1802 * connection and thus Curl_done() itself tried to use the connection
1803 * (again). Slight Lack of feedback in the report, but I don't think this
1804 * extra check can do much harm.
1806 if((CURLE_OK == result) || (CURLE_SEND_ERROR == result)) {
1808 bool protocol_done = TRUE;
1810 /* Now, redo the connect and get a new connection */
1811 result = Curl_connect(data, connp, &async, &protocol_done);
1812 if(CURLE_OK == result) {
1813 /* We have connected or sent away a name resolve query fine */
1815 conn = *connp; /* setup conn to again point to something nice */
1817 /* Now, if async is TRUE here, we need to wait for the name
1819 result = Curl_resolver_wait_resolv(conn, NULL);
1823 /* Resolved, continue with the connection */
1824 result = Curl_async_resolved(conn, &protocol_done);
1834 /* Returns CURLE_OK *and* sets '*url' if a request retry is wanted.
1836 NOTE: that the *url is malloc()ed. */
1837 CURLcode Curl_retry_request(struct connectdata *conn,
1840 struct SessionHandle *data = conn->data;
1844 /* if we're talking upload, we can't do the checks below, unless the protocol
1845 is HTTP as when uploading over HTTP we will still get a response */
1846 if(data->set.upload &&
1847 !(conn->handler->protocol&(CURLPROTO_HTTP|CURLPROTO_RTSP)))
1850 if(/* workaround for broken TLS servers */ data->state.ssl_connect_retry ||
1851 ((data->req.bytecount +
1852 data->req.headerbytecount == 0) &&
1854 !data->set.opt_no_body &&
1855 data->set.rtspreq != RTSPREQ_RECEIVE)) {
1856 /* We got no data, we attempted to re-use a connection and yet we want a
1857 "body". This might happen if the connection was left alive when we were
1858 done using it before, but that was closed when we wanted to read from
1859 it again. Bad luck. Retry the same request on a fresh connect! */
1860 infof(conn->data, "Connection died, retrying a fresh connect\n");
1861 *url = strdup(conn->data->change.url);
1863 return CURLE_OUT_OF_MEMORY;
1865 conn->bits.close = TRUE; /* close this connection */
1866 conn->bits.retry = TRUE; /* mark this as a connection we're about
1867 to retry. Marking it this way should
1868 prevent i.e HTTP transfers to return
1869 error just because nothing has been
1873 if((conn->handler->protocol&CURLPROTO_HTTP) &&
1874 data->state.proto.http->writebytecount)
1875 return Curl_readrewind(conn);
1881 * Curl_setup_transfer() is called to setup some basic properties for the
1882 * upcoming transfer.
1885 Curl_setup_transfer(
1886 struct connectdata *conn, /* connection data */
1887 int sockindex, /* socket index to read from or -1 */
1888 curl_off_t size, /* -1 if unknown at this point */
1889 bool getheader, /* TRUE if header parsing is wanted */
1890 curl_off_t *bytecountp, /* return number of bytes read or NULL */
1891 int writesockindex, /* socket index to write to, it may very well be
1892 the same we read from. -1 disables */
1893 curl_off_t *writecountp /* return number of bytes written or NULL */
1896 struct SessionHandle *data;
1897 struct SingleRequest *k;
1899 DEBUGASSERT(conn != NULL);
1904 DEBUGASSERT((sockindex <= 1) && (sockindex >= -1));
1906 /* now copy all input parameters */
1907 conn->sockfd = sockindex == -1 ?
1908 CURL_SOCKET_BAD : conn->sock[sockindex];
1909 conn->writesockfd = writesockindex == -1 ?
1910 CURL_SOCKET_BAD:conn->sock[writesockindex];
1911 k->getheader = getheader;
1914 k->bytecountp = bytecountp;
1915 k->writebytecountp = writecountp;
1917 /* The code sequence below is placed in this function just because all
1918 necessary input is not always known in do_complete() as this function may
1919 be called after that */
1924 Curl_pgrsSetDownloadSize(data, size);
1926 /* we want header and/or body, if neither then don't do this! */
1927 if(k->getheader || !data->set.opt_no_body) {
1929 if(conn->sockfd != CURL_SOCKET_BAD)
1930 k->keepon |= KEEP_RECV;
1932 if(conn->writesockfd != CURL_SOCKET_BAD) {
1935 Even if we require a 100-return code before uploading data, we might
1936 need to write data before that since the REQUEST may not have been
1937 finished sent off just yet.
1939 Thus, we must check if the request has been sent before we set the
1940 state info where we wait for the 100-return code
1942 if((data->state.expect100header) &&
1943 (data->state.proto.http->sending == HTTPSEND_BODY)) {
1944 /* wait with write until we either got 100-continue or a timeout */
1945 k->exp100 = EXP100_AWAITING_CONTINUE;
1946 k->start100 = Curl_tvnow();
1948 /* set a timeout for the multi interface */
1949 Curl_expire(data, CURL_TIMEOUT_EXPECT_100);
1952 if(data->state.expect100header)
1953 /* when we've sent off the rest of the headers, we must await a
1954 100-continue but first finish sending the request */
1955 k->exp100 = EXP100_SENDING_REQUEST;
1957 /* enable the write bit when we're not waiting for continue */
1958 k->keepon |= KEEP_SEND;
1960 } /* if(conn->writesockfd != CURL_SOCKET_BAD) */
1961 } /* if(k->getheader || !data->set.opt_no_body) */