1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2011, 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 ***************************************************************************/
25 /* -- WIN32 approved -- */
33 #include "strtoofft.h"
41 #ifdef HAVE_SYS_SOCKET_H
42 #include <sys/socket.h>
44 #ifdef HAVE_NETINET_IN_H
45 #include <netinet/in.h>
47 #ifdef HAVE_SYS_TIME_H
56 #ifdef HAVE_ARPA_INET_H
57 #include <arpa/inet.h>
62 #ifdef HAVE_SYS_IOCTL_H
63 #include <sys/ioctl.h>
69 #ifdef HAVE_SYS_PARAM_H
70 #include <sys/param.h>
73 #ifdef HAVE_SYS_SELECT_H
74 #include <sys/select.h>
78 #error "We can't compile without socket() support!"
84 #include <curl/curl.h>
87 #include "content_encoding.h"
91 #include "speedcheck.h"
97 #include "http_digest.h"
98 #include "http_ntlm.h"
99 #include "http_negotiate.h"
101 #include "curl_memory.h"
104 #include "easyif.h" /* for Curl_convert_to_network prototype */
108 #define _MPRINTF_REPLACE /* use our functions only */
109 #include <curl/mprintf.h>
111 /* The last #include file should be: */
112 #include "memdebug.h"
114 #define CURL_TIMEOUT_EXPECT_100 1000 /* counting ms here */
117 * This function will call the read callback to fill our buffer with data
120 CURLcode Curl_fillreadbuffer(struct connectdata *conn, int bytes, int *nreadp)
122 struct SessionHandle *data = conn->data;
123 size_t buffersize = (size_t)bytes;
125 #ifdef CURL_DOES_CONVERSIONS
126 bool sending_http_headers = FALSE;
128 if((conn->protocol&(PROT_HTTP|PROT_RTSP)) &&
129 (data->state.proto.http->sending == HTTPSEND_REQUEST)) {
130 /* We're sending the HTTP request headers, not the data.
131 Remember that so we don't re-translate them into garbage. */
132 sending_http_headers = TRUE;
136 if(data->req.upload_chunky) {
137 /* if chunked Transfer-Encoding */
138 buffersize -= (8 + 2 + 2); /* 32bit hex + CRLF + CRLF */
139 data->req.upload_fromhere += (8 + 2); /* 32bit hex + CRLF */
142 /* this function returns a size_t, so we typecast to int to prevent warnings
143 with picky compilers */
144 nread = (int)conn->fread_func(data->req.upload_fromhere, 1,
145 buffersize, conn->fread_in);
147 if(nread == CURL_READFUNC_ABORT) {
148 failf(data, "operation aborted by callback");
150 return CURLE_ABORTED_BY_CALLBACK;
152 else if(nread == CURL_READFUNC_PAUSE) {
153 struct SingleRequest *k = &data->req;
154 /* CURL_READFUNC_PAUSE pauses read callbacks that feed socket writes */
155 k->keepon |= KEEP_SEND_PAUSE; /* mark socket send as paused */
156 if(data->req.upload_chunky) {
157 /* Back out the preallocation done above */
158 data->req.upload_fromhere -= (8 + 2);
161 return CURLE_OK; /* nothing was read */
163 else if((size_t)nread > buffersize) {
164 /* the read function returned a too large value */
166 failf(data, "read function returned funny value");
167 return CURLE_READ_ERROR;
170 if(!data->req.forbidchunk && data->req.upload_chunky) {
171 /* if chunked Transfer-Encoding
177 /* On non-ASCII platforms the <DATA> may or may not be
178 translated based on set.prefer_ascii while the protocol
179 portion must always be translated to the network encoding.
180 To further complicate matters, line end conversion might be
181 done later on, so we need to prevent CRLFs from becoming
182 CRCRLFs if that's the case. To do this we use bare LFs
183 here, knowing they'll become CRLFs later on.
187 const char *endofline_native;
188 const char *endofline_network;
190 #ifdef CURL_DO_LINEEND_CONV
191 if((data->set.crlf) || (data->set.prefer_ascii)) {
194 #endif /* CURL_DO_LINEEND_CONV */
195 /* \n will become \r\n later on */
196 endofline_native = "\n";
197 endofline_network = "\x0a";
200 endofline_native = "\r\n";
201 endofline_network = "\x0d\x0a";
203 hexlen = snprintf(hexbuffer, sizeof(hexbuffer),
204 "%x%s", nread, endofline_native);
206 /* move buffer pointer */
207 data->req.upload_fromhere -= hexlen;
210 /* copy the prefix to the buffer, leaving out the NUL */
211 memcpy(data->req.upload_fromhere, hexbuffer, hexlen);
213 /* always append ASCII CRLF to the data */
214 memcpy(data->req.upload_fromhere + nread,
216 strlen(endofline_network));
218 #ifdef CURL_DOES_CONVERSIONS
221 if(data->set.prefer_ascii) {
222 /* translate the protocol and data */
226 /* just translate the protocol portion */
227 length = strlen(hexbuffer);
229 res = Curl_convert_to_network(data, data->req.upload_fromhere, length);
230 /* Curl_convert_to_network calls failf if unsuccessful */
233 #endif /* CURL_DOES_CONVERSIONS */
235 if((nread - hexlen) == 0)
236 /* mark this as done once this chunk is transfered */
237 data->req.upload_done = TRUE;
239 nread+=(int)strlen(endofline_native); /* for the added end of line */
241 #ifdef CURL_DOES_CONVERSIONS
242 else if((data->set.prefer_ascii) && (!sending_http_headers)) {
244 res = Curl_convert_to_network(data, data->req.upload_fromhere, nread);
245 /* Curl_convert_to_network calls failf if unsuccessful */
249 #endif /* CURL_DOES_CONVERSIONS */
258 * Curl_readrewind() rewinds the read stream. This is typically used for HTTP
259 * POST/PUT with multi-pass authentication when a sending was denied and a
260 * resend is necessary.
262 CURLcode Curl_readrewind(struct connectdata *conn)
264 struct SessionHandle *data = conn->data;
266 conn->bits.rewindaftersend = FALSE; /* we rewind now */
268 /* explicitly switch off sending data on this connection now since we are
269 about to restart a new transfer and thus we want to avoid inadvertently
270 sending more data on the existing connection until the next transfer
272 data->req.keepon &= ~KEEP_SEND;
274 /* We have sent away data. If not using CURLOPT_POSTFIELDS or
275 CURLOPT_HTTPPOST, call app to rewind
277 if(data->set.postfields ||
278 (data->set.httpreq == HTTPREQ_POST_FORM))
281 if(data->set.seek_func) {
284 err = (data->set.seek_func)(data->set.seek_client, 0, SEEK_SET);
286 failf(data, "seek callback returned error %d", (int)err);
287 return CURLE_SEND_FAIL_REWIND;
290 else if(data->set.ioctl_func) {
293 err = (data->set.ioctl_func)(data, CURLIOCMD_RESTARTREAD,
294 data->set.ioctl_client);
295 infof(data, "the ioctl callback returned %d\n", (int)err);
298 /* FIXME: convert to a human readable error message */
299 failf(data, "ioctl callback returned error %d", (int)err);
300 return CURLE_SEND_FAIL_REWIND;
304 /* If no CURLOPT_READFUNCTION is used, we know that we operate on a
305 given FILE * stream and we can actually attempt to rewind that
306 ourself with fseek() */
307 if(data->set.fread_func == (curl_read_callback)fread) {
308 if(-1 != fseek(data->set.in, 0, SEEK_SET))
309 /* successful rewind */
313 /* no callback set or failure above, makes us fail at once */
314 failf(data, "necessary data rewind wasn't possible");
315 return CURLE_SEND_FAIL_REWIND;
321 static int data_pending(const struct connectdata *conn)
323 /* in the case of libssh2, we can never be really sure that we have emptied
324 its internal buffers so we MUST always try until we get EAGAIN back */
325 return conn->protocol&(PROT_SCP|PROT_SFTP) ||
326 Curl_ssl_data_pending(conn, FIRSTSOCKET);
329 static void read_rewind(struct connectdata *conn,
332 DEBUGASSERT(conn->read_pos >= thismuch);
334 conn->read_pos -= thismuch;
335 conn->bits.stream_was_rewound = TRUE;
342 show = CURLMIN(conn->buf_len - conn->read_pos, sizeof(buf)-1);
343 if(conn->master_buffer) {
344 memcpy(buf, conn->master_buffer + conn->read_pos, show);
351 DEBUGF(infof(conn->data,
352 "Buffer after stream rewind (read_pos = %zu): [%s]",
353 conn->read_pos, buf));
359 * Check to see if CURLOPT_TIMECONDITION was met by comparing the time of the
360 * remote document with the time provided by CURLOPT_TIMEVAL
362 bool Curl_meets_timecondition(struct SessionHandle *data, time_t timeofdoc)
364 if((timeofdoc == 0) || (data->set.timevalue == 0))
367 switch(data->set.timecondition) {
368 case CURL_TIMECOND_IFMODSINCE:
370 if(timeofdoc <= data->set.timevalue) {
372 "The requested document is not new enough\n");
373 data->info.timecond = TRUE;
377 case CURL_TIMECOND_IFUNMODSINCE:
378 if(timeofdoc >= data->set.timevalue) {
380 "The requested document is not old enough\n");
381 data->info.timecond = TRUE;
391 * Go ahead and do a read if we have a readable socket or if
392 * the stream was rewound (in which case we have data in a
395 static CURLcode readwrite_data(struct SessionHandle *data,
396 struct connectdata *conn,
397 struct SingleRequest *k,
398 int *didwhat, bool *done)
400 CURLcode result = CURLE_OK;
401 ssize_t nread; /* number of bytes read */
402 size_t excess = 0; /* excess bytes read */
403 bool is_empty_data = FALSE;
404 #ifndef CURL_DISABLE_RTSP
405 bool readmore = FALSE; /* used by RTP to signal for more data */
410 /* This is where we loop until we have read everything there is to
411 read or we get a CURLE_AGAIN */
413 size_t buffersize = data->set.buffer_size?
414 data->set.buffer_size : BUFSIZE;
415 size_t bytestoread = buffersize;
417 if(k->size != -1 && !k->header) {
418 /* make sure we don't read "too much" if we can help it since we
419 might be pipelining and then someone else might want to read what
421 curl_off_t totalleft = k->size - k->bytecount;
422 if(totalleft < (curl_off_t)bytestoread)
423 bytestoread = (size_t)totalleft;
427 /* receive data from the network! */
428 result = Curl_read(conn, conn->sockfd, k->buf, bytestoread, &nread);
430 /* read would've blocked */
431 if(CURLE_AGAIN == result)
432 break; /* get out of loop */
438 /* read nothing but since we wanted nothing we consider this an OK
439 situation to proceed from */
443 if((k->bytecount == 0) && (k->writebytecount == 0)) {
444 Curl_pgrsTime(data, TIMER_STARTTRANSFER);
445 if(k->exp100 > EXP100_SEND_DATA)
446 /* set time stamp to compare with when waiting for the 100 */
447 k->start100 = Curl_tvnow();
450 *didwhat |= KEEP_RECV;
451 /* indicates data of zero size, i.e. empty file */
452 is_empty_data = (bool)((nread == 0) && (k->bodywrites == 0));
454 /* NUL terminate, allowing string ops to be used */
455 if(0 < nread || is_empty_data) {
458 else if(0 >= nread) {
459 /* if we receive 0 or less here, the server closed the connection
460 and we bail out from this! */
461 DEBUGF(infof(data, "nread <= 0, server closed connection, bailing\n"));
462 k->keepon &= ~KEEP_RECV;
466 /* Default buffer to use when we write the buffer, it may be changed
467 in the flow below before the actual storing is done. */
470 #ifndef CURL_DISABLE_RTSP
471 /* Check for RTP at the beginning of the data */
472 if(conn->protocol & PROT_RTSP) {
473 result = Curl_rtsp_rtp_readwrite(data, conn, &nread, &readmore);
481 #ifndef CURL_DISABLE_HTTP
482 /* Since this is a two-state thing, we check if we are parsing
483 headers at the moment or not. */
485 /* we are in parse-the-header-mode */
486 bool stop_reading = FALSE;
487 result = Curl_http_readwrite_headers(data, conn, &nread, &stop_reading);
491 #ifndef CURL_DISABLE_RTSP
492 /* Check for RTP after the headers if there is no Content */
493 if(k->maxdownload <= 0 && nread > 0 && (conn->protocol & PROT_RTSP)) {
494 result = Curl_rtsp_rtp_readwrite(data, conn, &nread, &readmore);
503 /* We've stopped dealing with input, get out of the do-while loop */
506 #endif /* CURL_DISABLE_HTTP */
509 /* This is not an 'else if' since it may be a rest from the header
510 parsing, where the beginning of the buffer is headers and the end
512 if(k->str && !k->header && (nread > 0 || is_empty_data)) {
515 #ifndef CURL_DISABLE_HTTP
516 if(0 == k->bodywrites && !is_empty_data) {
517 /* These checks are only made the first time we are about to
518 write a piece of the body */
519 if(conn->protocol&(PROT_HTTP|PROT_RTSP)) {
520 /* HTTP-only checks */
522 if(data->req.newurl) {
523 if(conn->bits.close) {
524 /* Abort after the headers if "follow Location" is set
525 and we're set to close anyway. */
526 k->keepon &= ~KEEP_RECV;
530 /* We have a new url to load, but since we want to be able
531 to re-use this connection properly, we read the full
532 response in "ignore more" */
533 k->ignorebody = TRUE;
534 infof(data, "Ignoring the response-body\n");
536 if(data->state.resume_from && !k->content_range &&
537 (data->set.httpreq==HTTPREQ_GET) &&
539 /* we wanted to resume a download, although the server doesn't
540 * seem to support this and we did this with a GET (if it
541 * wasn't a GET we did a POST or PUT resume) */
542 failf(data, "HTTP server doesn't seem to support "
543 "byte ranges. Cannot resume.");
544 return CURLE_RANGE_ERROR;
547 if(data->set.timecondition && !data->state.range) {
548 /* A time condition has been set AND no ranges have been
549 requested. This seems to be what chapter 13.3.4 of
550 RFC 2616 defines to be the correct action for a
553 if(!Curl_meets_timecondition(data, k->timeofdoc)) {
557 } /* we have a time condition */
560 } /* this is the first time we write a body part */
561 #endif /* CURL_DISABLE_HTTP */
564 /* pass data to the debug function before it gets "dechunked" */
565 if(data->set.verbose) {
567 Curl_debug(data, CURLINFO_DATA_IN, data->state.headerbuff,
568 (size_t)k->hbuflen, conn);
569 if(k->badheader == HEADER_PARTHEADER)
570 Curl_debug(data, CURLINFO_DATA_IN,
571 k->str, (size_t)nread, conn);
574 Curl_debug(data, CURLINFO_DATA_IN,
575 k->str, (size_t)nread, conn);
578 #ifndef CURL_DISABLE_HTTP
581 * Here comes a chunked transfer flying and we need to decode this
582 * properly. While the name says read, this function both reads
583 * and writes away the data. The returned 'nread' holds the number
584 * of actual data it wrote to the client.
588 Curl_httpchunk_read(conn, k->str, nread, &nread);
590 if(CHUNKE_OK < res) {
591 if(CHUNKE_WRITE_ERROR == res) {
592 failf(data, "Failed writing data");
593 return CURLE_WRITE_ERROR;
595 failf(data, "Received problem %d in the chunky parser", (int)res);
596 return CURLE_RECV_ERROR;
598 else if(CHUNKE_STOP == res) {
600 /* we're done reading chunks! */
601 k->keepon &= ~KEEP_RECV; /* read no more */
603 /* There are now possibly N number of bytes at the end of the
604 str buffer that weren't written to the client.
606 We DO care about this data if we are pipelining.
607 Push it back to be read on the next pass. */
609 dataleft = conn->chunk.dataleft;
611 infof(conn->data, "Leftovers after chunking: %zu bytes", dataleft);
612 if(conn->data->multi && Curl_multi_canPipeline(conn->data->multi)) {
613 /* only attempt the rewind if we truly are pipelining */
614 infof(conn->data, "Rewinding %zu bytes\n",dataleft);
615 read_rewind(conn, dataleft);
619 /* If it returned OK, we just keep going */
621 #endif /* CURL_DISABLE_HTTP */
623 /* Account for body content stored in the header buffer */
624 if(k->badheader && !k->ignorebody) {
625 DEBUGF(infof(data, "Increasing bytecount by %zu from hbuflen\n",
627 k->bytecount += k->hbuflen;
630 if((-1 != k->maxdownload) &&
631 (k->bytecount + nread >= k->maxdownload)) {
633 excess = (size_t)(k->bytecount + nread - k->maxdownload);
634 if(excess > 0 && !k->ignorebody) {
635 if(conn->data->multi && Curl_multi_canPipeline(conn->data->multi)) {
636 /* The 'excess' amount below can't be more than BUFSIZE which
637 always will fit in a size_t */
639 "Rewinding stream by : %zu"
640 " bytes on url %s (size = %" FORMAT_OFF_T
641 ", maxdownload = %" FORMAT_OFF_T
642 ", bytecount = %" FORMAT_OFF_T ", nread = %zd)\n",
643 excess, data->state.path,
644 k->size, k->maxdownload, k->bytecount, nread);
645 read_rewind(conn, excess);
649 "Excess found in a non pipelined read:"
651 ", size = %" FORMAT_OFF_T
652 ", maxdownload = %" FORMAT_OFF_T
653 ", bytecount = %" FORMAT_OFF_T "\n",
654 excess, k->size, k->maxdownload, k->bytecount);
658 nread = (ssize_t) (k->maxdownload - k->bytecount);
659 if(nread < 0 ) /* this should be unusual */
662 k->keepon &= ~KEEP_RECV; /* we're done reading */
665 k->bytecount += nread;
667 Curl_pgrsSetDownloadCounter(data, k->bytecount);
669 if(!k->chunk && (nread || k->badheader || is_empty_data)) {
670 /* If this is chunky transfer, it was already written */
672 if(k->badheader && !k->ignorebody) {
673 /* we parsed a piece of data wrongly assuming it was a header
674 and now we output it as body instead */
676 /* Don't let excess data pollute body writes */
677 if(k->maxdownload == -1 || (curl_off_t)k->hbuflen <= k->maxdownload)
678 result = Curl_client_write(conn, CLIENTWRITE_BODY,
679 data->state.headerbuff,
682 result = Curl_client_write(conn, CLIENTWRITE_BODY,
683 data->state.headerbuff,
684 (size_t)k->maxdownload);
689 if(k->badheader < HEADER_ALLBAD) {
690 /* This switch handles various content encodings. If there's an
691 error here, be sure to check over the almost identical code
693 Make sure that ALL_CONTENT_ENCODINGS contains all the
694 encodings handled here. */
696 switch (conn->data->set.http_ce_skip ?
697 IDENTITY : k->content_encoding) {
700 /* This is the default when the server sends no
701 Content-Encoding header. See Curl_readwrite_init; the
702 memset() call initializes k->content_encoding to zero. */
705 #ifndef CURL_DISABLE_POP3
706 if(conn->protocol&PROT_POP3)
707 result = Curl_pop3_write(conn, k->str, nread);
709 #endif /* CURL_DISABLE_POP3 */
711 result = Curl_client_write(conn, CLIENTWRITE_BODY, k->str,
718 /* Assume CLIENTWRITE_BODY; headers are not encoded. */
720 result = Curl_unencode_deflate_write(conn, k, nread);
724 /* Assume CLIENTWRITE_BODY; headers are not encoded. */
726 result = Curl_unencode_gzip_write(conn, k, nread);
731 failf (data, "Unrecognized content encoding type. "
732 "libcurl understands `identity', `deflate' and `gzip' "
733 "content encodings.");
734 result = CURLE_BAD_CONTENT_ENCODING;
739 k->badheader = HEADER_NORMAL; /* taken care of now */
745 } /* if(! header and data to read ) */
747 #ifndef CURL_DISABLE_RTSP
748 if(excess > 0 && !conn->bits.stream_was_rewound &&
749 (conn->protocol & PROT_RTSP)) {
750 /* Check for RTP after the content if there is unrewound excess */
752 /* Parse the excess data */
754 nread = (ssize_t)excess;
756 result = Curl_rtsp_rtp_readwrite(data, conn, &nread, &readmore);
761 k->keepon |= KEEP_RECV; /* we're not done reading */
767 /* if we received nothing, the server closed the connection and we
769 k->keepon &= ~KEEP_RECV;
772 } while(data_pending(conn));
774 if(((k->keepon & (KEEP_RECV|KEEP_SEND)) == KEEP_SEND) &&
776 /* When we've read the entire thing and the close bit is set, the server
777 may now close the connection. If there's now any kind of sending going
778 on from our side, we need to stop that immediately. */
779 infof(data, "we are done reading and this is set to close, stop send\n");
780 k->keepon &= ~KEEP_SEND; /* no writing anymore either */
787 * Send data to upload to the server, when the socket is writable.
789 static CURLcode readwrite_upload(struct SessionHandle *data,
790 struct connectdata *conn,
791 struct SingleRequest *k,
795 ssize_t bytes_written;
797 ssize_t nread; /* number of bytes read */
798 bool sending_http_headers = FALSE;
800 if((k->bytecount == 0) && (k->writebytecount == 0))
801 Curl_pgrsTime(data, TIMER_STARTTRANSFER);
803 *didwhat |= KEEP_SEND;
806 * We loop here to do the READ and SEND loop until we run out of
807 * data to send or until we get EWOULDBLOCK back
811 /* only read more data if there's no upload data already
812 present in the upload buffer */
813 if(0 == data->req.upload_present) {
814 /* init the "upload from here" pointer */
815 data->req.upload_fromhere = k->uploadbuf;
817 if(!k->upload_done) {
818 /* HTTP pollution, this should be written nicer to become more
819 protocol agnostic. */
822 if((k->exp100 == EXP100_SENDING_REQUEST) &&
823 (data->state.proto.http->sending == HTTPSEND_BODY)) {
824 /* If this call is to send body data, we must take some action:
825 We have sent off the full HTTP 1.1 request, and we shall now
826 go into the Expect: 100 state and await such a header */
827 k->exp100 = EXP100_AWAITING_CONTINUE; /* wait for the header */
828 k->keepon &= ~KEEP_SEND; /* disable writing */
829 k->start100 = Curl_tvnow(); /* timeout count starts now */
830 *didwhat &= ~KEEP_SEND; /* we didn't write anything actually */
832 /* set a timeout for the multi interface */
833 Curl_expire(data, CURL_TIMEOUT_EXPECT_100);
837 if(conn->protocol&(PROT_HTTP|PROT_RTSP)) {
838 if(data->state.proto.http->sending == HTTPSEND_REQUEST)
839 /* We're sending the HTTP request headers, not the data.
840 Remember that so we don't change the line endings. */
841 sending_http_headers = TRUE;
843 sending_http_headers = FALSE;
846 result = Curl_fillreadbuffer(conn, BUFSIZE, &fillcount);
850 nread = (ssize_t)fillcount;
853 nread = 0; /* we're done uploading/reading */
855 if(!nread && (k->keepon & KEEP_SEND_PAUSE)) {
856 /* this is a paused transfer */
861 k->keepon &= ~KEEP_SEND; /* we're done writing */
863 if(conn->bits.rewindaftersend) {
864 result = Curl_readrewind(conn);
871 /* store number of bytes available for upload */
872 data->req.upload_present = nread;
874 #ifndef CURL_DISABLE_SMTP
875 if(conn->protocol & PROT_SMTP) {
876 result = Curl_smtp_escape_eob(conn, nread);
881 #endif /* CURL_DISABLE_SMTP */
883 /* convert LF to CRLF if so asked */
884 if((!sending_http_headers) &&
885 #ifdef CURL_DO_LINEEND_CONV
886 /* always convert if we're FTPing in ASCII mode */
887 ((data->set.crlf) || (data->set.prefer_ascii))) {
891 if(data->state.scratch == NULL)
892 data->state.scratch = malloc(2*BUFSIZE);
893 if(data->state.scratch == NULL) {
894 failf (data, "Failed to alloc scratch buffer!");
895 return CURLE_OUT_OF_MEMORY;
898 * ASCII/EBCDIC Note: This is presumably a text (not binary)
899 * transfer so the data should already be in ASCII.
900 * That means the hex values for ASCII CR (0x0d) & LF (0x0a)
901 * must be used instead of the escape sequences \r & \n.
903 for(i = 0, si = 0; i < nread; i++, si++) {
904 if(data->req.upload_fromhere[i] == 0x0a) {
905 data->state.scratch[si++] = 0x0d;
906 data->state.scratch[si] = 0x0a;
907 if(!data->set.crlf) {
908 /* we're here only because FTP is in ASCII mode...
909 bump infilesize for the LF we just added */
910 data->set.infilesize++;
914 data->state.scratch[si] = data->req.upload_fromhere[i];
917 /* only perform the special operation if we really did replace
921 /* upload from the new (replaced) buffer instead */
922 data->req.upload_fromhere = data->state.scratch;
924 /* set the new amount too */
925 data->req.upload_present = nread;
928 } /* if 0 == data->req.upload_present */
930 /* We have a partial buffer left from a previous "round". Use
931 that instead of reading more data */
934 /* write to socket (send away data) */
935 result = Curl_write(conn,
936 conn->writesockfd, /* socket to send to */
937 data->req.upload_fromhere, /* buffer pointer */
938 data->req.upload_present, /* buffer size */
939 &bytes_written); /* actually sent */
944 if(data->set.verbose)
945 /* show the data before we change the pointer upload_fromhere */
946 Curl_debug(data, CURLINFO_DATA_OUT, data->req.upload_fromhere,
947 (size_t)bytes_written, conn);
949 k->writebytecount += bytes_written;
951 if(k->writebytecount == data->set.infilesize) {
952 /* we have sent all data we were supposed to */
953 k->upload_done = TRUE;
954 infof(data, "We are completely uploaded and fine\n");
957 if(data->req.upload_present != bytes_written) {
958 /* we only wrote a part of the buffer (if anything), deal with it! */
960 /* store the amount of bytes left in the buffer to write */
961 data->req.upload_present -= bytes_written;
963 /* advance the pointer where to find the buffer when the next send
965 data->req.upload_fromhere += bytes_written;
968 /* we've uploaded that buffer now */
969 data->req.upload_fromhere = k->uploadbuf;
970 data->req.upload_present = 0; /* no more bytes left */
973 /* switch off writing, we're done! */
974 k->keepon &= ~KEEP_SEND; /* we're done writing */
978 Curl_pgrsSetUploadCounter(data, k->writebytecount);
980 } while(0); /* just to break out from! */
986 * Curl_readwrite() is the low-level function to be called when data is to
987 * be read and written to/from the connection.
989 CURLcode Curl_readwrite(struct connectdata *conn,
992 struct SessionHandle *data = conn->data;
993 struct SingleRequest *k = &data->req;
997 curl_socket_t fd_read;
998 curl_socket_t fd_write;
999 int select_res = conn->cselect_bits;
1001 conn->cselect_bits = 0;
1003 /* only use the proper socket if the *_HOLD bit is not set simultaneously as
1004 then we are in rate limiting state in that transfer direction */
1006 if((k->keepon & KEEP_RECVBITS) == KEEP_RECV)
1007 fd_read = conn->sockfd;
1009 fd_read = CURL_SOCKET_BAD;
1011 if((k->keepon & KEEP_SENDBITS) == KEEP_SEND)
1012 fd_write = conn->writesockfd;
1014 fd_write = CURL_SOCKET_BAD;
1016 if(!select_res) /* Call for select()/poll() only, if read/write/error
1017 status is not known. */
1018 select_res = Curl_socket_ready(fd_read, fd_write, 0);
1020 if(select_res == CURL_CSELECT_ERR) {
1021 failf(data, "select/poll returned error");
1022 return CURLE_SEND_ERROR;
1025 /* We go ahead and do a read if we have a readable socket or if
1026 the stream was rewound (in which case we have data in a
1028 if((k->keepon & KEEP_RECV) &&
1029 ((select_res & CURL_CSELECT_IN) || conn->bits.stream_was_rewound)) {
1031 result = readwrite_data(data, conn, k, &didwhat, done);
1036 /* If we still have writing to do, we check if we have a writable socket. */
1037 if((k->keepon & KEEP_SEND) && (select_res & CURL_CSELECT_OUT)) {
1040 result = readwrite_upload(data, conn, k, &didwhat);
1045 k->now = Curl_tvnow();
1047 /* Update read/write counters */
1049 *k->bytecountp = k->bytecount; /* read count */
1050 if(k->writebytecountp)
1051 *k->writebytecountp = k->writebytecount; /* write count */
1054 /* no read no write, this is a timeout? */
1055 if(k->exp100 == EXP100_AWAITING_CONTINUE) {
1056 /* This should allow some time for the header to arrive, but only a
1057 very short time as otherwise it'll be too much wasted time too
1060 /* Quoting RFC2616, section "8.2.3 Use of the 100 (Continue) Status":
1062 Therefore, when a client sends this header field to an origin server
1063 (possibly via a proxy) from which it has never seen a 100 (Continue)
1064 status, the client SHOULD NOT wait for an indefinite period before
1065 sending the request body.
1069 long ms = Curl_tvdiff(k->now, k->start100);
1070 if(ms > CURL_TIMEOUT_EXPECT_100) {
1071 /* we've waited long enough, continue anyway */
1072 k->exp100 = EXP100_SEND_DATA;
1073 k->keepon |= KEEP_SEND;
1074 infof(data, "Done waiting for 100-continue\n");
1079 if(Curl_pgrsUpdate(conn))
1080 result = CURLE_ABORTED_BY_CALLBACK;
1082 result = Curl_speedcheck(data, k->now);
1087 if(0 > Curl_timeleft(data, &k->now, FALSE)) {
1089 failf(data, "Operation timed out after %ld milliseconds with %"
1090 FORMAT_OFF_T " out of %" FORMAT_OFF_T " bytes received",
1091 Curl_tvdiff(k->now, data->progress.t_startsingle), k->bytecount,
1095 failf(data, "Operation timed out after %ld milliseconds with %"
1096 FORMAT_OFF_T " bytes received",
1097 Curl_tvdiff(k->now, data->progress.t_startsingle), k->bytecount);
1099 return CURLE_OPERATION_TIMEDOUT;
1104 * The transfer has been performed. Just make some general checks before
1108 if(!(data->set.opt_no_body) && (k->size != -1) &&
1109 (k->bytecount != k->size) &&
1110 #ifdef CURL_DO_LINEEND_CONV
1111 /* Most FTP servers don't adjust their file SIZE response for CRLFs,
1112 so we'll check to see if the discrepancy can be explained
1113 by the number of CRLFs we've changed to LFs.
1115 (k->bytecount != (k->size + data->state.crlf_conversions)) &&
1116 #endif /* CURL_DO_LINEEND_CONV */
1117 !data->req.newurl) {
1118 failf(data, "transfer closed with %" FORMAT_OFF_T
1119 " bytes remaining to read",
1120 k->size - k->bytecount);
1121 return CURLE_PARTIAL_FILE;
1123 else if(!(data->set.opt_no_body) &&
1125 (conn->chunk.state != CHUNK_STOP)) {
1127 * In chunked mode, return an error if the connection is closed prior to
1128 * the empty (terminiating) chunk is read.
1130 * The condition above used to check for
1131 * conn->proto.http->chunk.datasize != 0 which is true after reading
1132 * *any* chunk, not just the empty chunk.
1135 failf(data, "transfer closed with outstanding read data remaining");
1136 return CURLE_PARTIAL_FILE;
1138 if(Curl_pgrsUpdate(conn))
1139 return CURLE_ABORTED_BY_CALLBACK;
1142 /* Now update the "done" boolean we return */
1143 *done = (bool)(0 == (k->keepon&(KEEP_RECV|KEEP_SEND|
1144 KEEP_RECV_PAUSE|KEEP_SEND_PAUSE)));
1150 * Curl_single_getsock() gets called by the multi interface code when the app
1151 * has requested to get the sockets for the current connection. This function
1152 * will then be called once for every connection that the multi interface
1153 * keeps track of. This function will only be called for connections that are
1154 * in the proper state to have this information available.
1156 int Curl_single_getsock(const struct connectdata *conn,
1157 curl_socket_t *sock, /* points to numsocks number
1161 const struct SessionHandle *data = conn->data;
1162 int bitmap = GETSOCK_BLANK;
1163 unsigned sockindex = 0;
1165 if(conn->handler->perform_getsock)
1166 return conn->handler->perform_getsock(conn, sock, numsocks);
1169 /* simple check but we might need two slots */
1170 return GETSOCK_BLANK;
1172 /* don't include HOLD and PAUSE connections */
1173 if((data->req.keepon & KEEP_RECVBITS) == KEEP_RECV) {
1175 DEBUGASSERT(conn->sockfd != CURL_SOCKET_BAD);
1177 bitmap |= GETSOCK_READSOCK(sockindex);
1178 sock[sockindex] = conn->sockfd;
1181 /* don't include HOLD and PAUSE connections */
1182 if((data->req.keepon & KEEP_SENDBITS) == KEEP_SEND) {
1184 if((conn->sockfd != conn->writesockfd) ||
1185 !(data->req.keepon & KEEP_RECV)) {
1186 /* only if they are not the same socket or we didn't have a readable
1187 one, we increase index */
1188 if(data->req.keepon & KEEP_RECV)
1189 sockindex++; /* increase index if we need two entries */
1191 DEBUGASSERT(conn->writesockfd != CURL_SOCKET_BAD);
1193 sock[sockindex] = conn->writesockfd;
1196 bitmap |= GETSOCK_WRITESOCK(sockindex);
1203 * Determine optimum sleep time based on configured rate, current rate,
1205 * Returns value in mili-seconds.
1207 * The basic idea is to adjust the desired rate up/down in this method
1208 * based on whether we are running too slow or too fast. Then, calculate
1209 * how many miliseconds to wait for the next packet to achieve this new
1212 long Curl_sleep_time(curl_off_t rate_bps, curl_off_t cur_rate_bps,
1215 curl_off_t min_sleep = 0;
1221 /* If running faster than about .1% of the desired speed, slow
1222 * us down a bit. Use shift instead of division as the 0.1%
1223 * cutoff is arbitrary anyway.
1225 if (cur_rate_bps > (rate_bps + (rate_bps >> 10))) {
1226 /* running too fast, decrease target rate by 1/64th of rate */
1227 rate_bps -= rate_bps >> 6;
1230 else if (cur_rate_bps < (rate_bps - (rate_bps >> 10))) {
1231 /* running too slow, increase target rate by 1/64th of rate */
1232 rate_bps += rate_bps >> 6;
1235 /* Determine number of miliseconds to wait until we do
1236 * the next packet at the adjusted rate. We should wait
1237 * longer when using larger packets, for instance.
1239 rv = ((curl_off_t)((pkt_size * 8) * 1000) / rate_bps);
1241 /* Catch rounding errors and always slow down at least 1ms if
1242 * we are running too fast.
1247 /* Bound value to fit in 'long' on 32-bit platform. That's
1248 * plenty long enough anyway!
1260 * This function is what performs the actual transfer. It is capable of doing
1261 * both ways simultaneously. The transfer must already have been setup by a
1262 * call to Curl_setup_transfer().
1264 * Note that headers are created in a preallocated buffer of a default size.
1265 * That buffer can be enlarged on demand, but it is never shrunken again.
1270 Transfer(struct connectdata *conn)
1273 struct SessionHandle *data = conn->data;
1274 struct SingleRequest *k = &data->req;
1281 if((conn->sockfd == CURL_SOCKET_BAD) &&
1282 (conn->writesockfd == CURL_SOCKET_BAD))
1283 /* nothing to read, nothing to write, we're already OK! */
1286 /* we want header and/or body, if neither then don't do this! */
1287 if(!k->getheader && data->set.opt_no_body)
1291 curl_socket_t fd_read = conn->sockfd;
1292 curl_socket_t fd_write = conn->writesockfd;
1293 int keepon = k->keepon;
1297 /* if waitfor is set, get the RECV and SEND bits from that but keep the
1299 keepon &= ~ (KEEP_RECV|KEEP_SEND);
1300 keepon |= conn->waitfor & (KEEP_RECV|KEEP_SEND);
1303 /* limit-rate logic: if speed exceeds threshold, then do not include fd in
1304 select set. The current speed is recalculated in each Curl_readwrite()
1306 if((keepon & KEEP_SEND) &&
1307 (!data->set.max_send_speed ||
1308 (data->progress.ulspeed < data->set.max_send_speed) )) {
1309 k->keepon &= ~KEEP_SEND_HOLD;
1312 if (data->set.upload && data->set.max_send_speed &&
1313 (data->progress.ulspeed > data->set.max_send_speed) ) {
1314 /* calculate upload rate-limitation timeout. */
1315 buffersize = (int)(data->set.buffer_size ?
1316 data->set.buffer_size : BUFSIZE);
1317 totmp = (int)Curl_sleep_time(data->set.max_send_speed,
1318 data->progress.ulspeed, buffersize);
1319 if (totmp < timeout_ms)
1322 fd_write = CURL_SOCKET_BAD;
1323 if(keepon & KEEP_SEND)
1324 k->keepon |= KEEP_SEND_HOLD; /* hold it */
1327 if((keepon & KEEP_RECV) &&
1328 (!data->set.max_recv_speed ||
1329 (data->progress.dlspeed < data->set.max_recv_speed)) ) {
1330 k->keepon &= ~KEEP_RECV_HOLD;
1333 if ((!data->set.upload) && data->set.max_recv_speed &&
1334 (data->progress.dlspeed > data->set.max_recv_speed)) {
1335 /* Calculate download rate-limitation timeout. */
1336 buffersize = (int)(data->set.buffer_size ?
1337 data->set.buffer_size : BUFSIZE);
1338 totmp = (int)Curl_sleep_time(data->set.max_recv_speed,
1339 data->progress.dlspeed, buffersize);
1340 if (totmp < timeout_ms)
1343 fd_read = CURL_SOCKET_BAD;
1344 if(keepon & KEEP_RECV)
1345 k->keepon |= KEEP_RECV_HOLD; /* hold it */
1348 /* pause logic. Don't check descriptors for paused connections */
1349 if(k->keepon & KEEP_RECV_PAUSE)
1350 fd_read = CURL_SOCKET_BAD;
1351 if(k->keepon & KEEP_SEND_PAUSE)
1352 fd_write = CURL_SOCKET_BAD;
1354 /* The *_HOLD and *_PAUSE logic is necessary since even though there might
1355 be no traffic during the select interval, we still call
1356 Curl_readwrite() for the timeout case and if we limit transfer speed we
1357 must make sure that this function doesn't transfer anything while in
1360 The no timeout for the first round is for the protocols for which data
1361 has already been slurped off the socket and thus waiting for action
1362 won't work since it'll wait even though there is already data present
1365 ((fd_read != CURL_SOCKET_BAD) || (fd_write != CURL_SOCKET_BAD)))
1366 /* if this is the first lap and one of the file descriptors is fine
1367 to work with, skip the timeout */
1370 totmp = Curl_timeleft(data, &k->now, FALSE);
1372 return CURLE_OPERATION_TIMEDOUT;
1376 if (totmp < timeout_ms)
1380 switch (Curl_socket_ready(fd_read, fd_write, timeout_ms)) {
1381 case -1: /* select() error, stop reading */
1383 /* The EINTR is not serious, and it seems you might get this more
1384 often when using the lib in a multi-threaded environment! */
1385 if(SOCKERRNO == EINTR)
1388 return CURLE_RECV_ERROR; /* indicate a network problem */
1389 case 0: /* timeout */
1390 default: /* readable descriptors */
1392 result = Curl_readwrite(conn, &done);
1393 /* "done" signals to us if the transfer(s) are ready */
1399 first = FALSE; /* not the first lap anymore */
1405 static CURLcode loadhostpairs(struct SessionHandle *data)
1407 struct curl_slist *hostp;
1412 for(hostp = data->change.resolve; hostp; hostp = hostp->next ) {
1415 if(hostp->data[0] == '-') {
1416 /* TODO: mark an entry for removal */
1418 else if(3 == sscanf(hostp->data, "%255[^:]:%d:%255s", hostname, &port,
1420 struct Curl_dns_entry *dns;
1421 Curl_addrinfo *addr;
1423 addr = Curl_str2addr(address, port);
1425 infof(data, "Resolve %s found illegal!\n", hostp->data);
1428 infof(data, "Added %s:%d:%s to DNS cache\n",
1429 hostname, port, address);
1432 Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
1434 /* put this host in the cache */
1435 dns = Curl_cache_addr(data, addr, hostname, port);
1438 Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
1441 return CURLE_OUT_OF_MEMORY;
1444 data->change.resolve = NULL; /* dealt with now */
1451 * Curl_pretransfer() is called immediately before a transfer starts.
1453 CURLcode Curl_pretransfer(struct SessionHandle *data)
1456 if(!data->change.url) {
1457 /* we can't do anything without URL */
1458 failf(data, "No URL set!");
1459 return CURLE_URL_MALFORMAT;
1462 /* Init the SSL session ID cache here. We do it here since we want to do it
1463 after the *_setopt() calls (that could change the size of the cache) but
1464 before any transfer takes place. */
1465 res = Curl_ssl_initsessions(data, data->set.ssl.numsessions);
1469 data->set.followlocation=0; /* reset the location-follow counter */
1470 data->state.this_is_a_follow = FALSE; /* reset this */
1471 data->state.errorbuf = FALSE; /* no error has occurred */
1472 data->state.httpversion = 0; /* don't assume any particular server version */
1474 data->state.ssl_connect_retry = FALSE;
1476 data->state.authproblem = FALSE;
1477 data->state.authhost.want = data->set.httpauth;
1478 data->state.authproxy.want = data->set.proxyauth;
1479 Curl_safefree(data->info.wouldredirect);
1480 data->info.wouldredirect = NULL;
1482 /* If there is a list of cookie files to read, do it now! */
1483 if(data->change.cookielist)
1484 Curl_cookie_loadfiles(data);
1486 /* If there is a list of host pairs to deal with */
1487 if(data->change.resolve)
1488 res = loadhostpairs(data);
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;
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);
1504 Curl_initinfo(data); /* reset session-specific information "variables" */
1505 Curl_pgrsStartNow(data);
1507 if(data->set.timeout)
1508 Curl_expire(data, data->set.timeout);
1510 if(data->set.connecttimeout)
1511 Curl_expire(data, data->set.connecttimeout);
1518 * Curl_posttransfer() is called immediately after a transfer ends
1520 CURLcode Curl_posttransfer(struct SessionHandle *data)
1522 #if defined(HAVE_SIGNAL) && defined(SIGPIPE) && !defined(HAVE_MSG_NOSIGNAL)
1523 /* restore the signal handler for SIGPIPE before we get back */
1524 if(!data->set.no_signal)
1525 signal(SIGPIPE, data->state.prev_signal);
1527 (void)data; /* unused parameter */
1530 if(!(data->progress.flags & PGRS_HIDE) &&
1531 !data->progress.callback)
1532 /* only output if we don't use a progress callback and we're not hidden */
1533 fprintf(data->set.err, "\n");
1538 #ifndef CURL_DISABLE_HTTP
1540 * strlen_url() returns the length of the given URL if the spaces within the
1541 * URL were properly URL encoded.
1543 static size_t strlen_url(const char *url)
1547 bool left=TRUE; /* left side of the ? */
1549 for(ptr=url; *ptr; ptr++) {
1568 /* strcpy_url() copies a url to a output buffer and URL-encodes the spaces in
1569 * the source URL accordingly.
1571 static void strcpy_url(char *output, const char *url)
1573 /* we must add this with whitespace-replacing */
1576 char *optr = output;
1577 for(iptr = url; /* read from here */
1578 *iptr; /* until zero byte */
1589 *optr++='%'; /* add a '%' */
1590 *optr++='2'; /* add a '2' */
1591 *optr++='0'; /* add a '0' */
1594 *optr++='+'; /* add a '+' here */
1598 *optr=0; /* zero terminate output buffer */
1603 * Returns true if the given URL is absolute (as opposed to relative)
1605 static bool is_absolute_url(const char *url)
1607 char prot[16]; /* URL protocol string storage */
1608 char letter; /* used for a silly sscanf */
1610 return (bool)(2 == sscanf(url, "%15[^?&/:]://%c", prot, &letter));
1614 * Concatenate a relative URL to a base URL making it absolute.
1615 * URL-encodes any spaces.
1616 * The returned pointer must be freed by the caller unless NULL
1617 * (returns NULL on out of memory).
1619 static char *concat_url(const char *base, const char *relurl)
1622 TRY to append this new path to the old URL
1623 to the right of the host part. Oh crap, this is doomed to cause
1624 problems in the future...
1631 const char *useurl = relurl;
1634 /* we must make our own copy of the URL to play with, as it may
1635 point to read-only data */
1636 char *url_clone=strdup(base);
1639 return NULL; /* skip out of this NOW */
1641 /* protsep points to the start of the host name */
1642 protsep=strstr(url_clone, "//");
1646 protsep+=2; /* pass the slashes */
1648 if('/' != relurl[0]) {
1651 /* First we need to find out if there's a ?-letter in the URL,
1652 and cut it and the right-side of that off */
1653 pathsep = strchr(protsep, '?');
1657 /* we have a relative path to append to the last slash if there's one
1658 available, or if the new URL is just a query string (starts with a
1659 '?') we append the new one at the end of the entire currently worked
1661 if(useurl[0] != '?') {
1662 pathsep = strrchr(protsep, '/');
1667 /* Check if there's any slash after the host name, and if so, remember
1668 that position instead */
1669 pathsep = strchr(protsep, '/');
1671 protsep = pathsep+1;
1675 /* now deal with one "./" or any amount of "../" in the newurl
1676 and act accordingly */
1678 if((useurl[0] == '.') && (useurl[1] == '/'))
1679 useurl+=2; /* just skip the "./" */
1681 while((useurl[0] == '.') &&
1682 (useurl[1] == '.') &&
1683 (useurl[2] == '/')) {
1685 useurl+=3; /* pass the "../" */
1690 /* cut off one more level from the right of the original URL */
1691 pathsep = strrchr(protsep, '/');
1702 /* We got a new absolute path for this server, cut off from the
1704 pathsep = strchr(protsep, '/');
1706 /* When people use badly formatted URLs, such as
1707 "http://www.url.com?dir=/home/daniel" we must not use the first
1708 slash, if there's a ?-letter before it! */
1709 char *sep = strchr(protsep, '?');
1710 if(sep && (sep < pathsep))
1715 /* There was no slash. Now, since we might be operating on a badly
1716 formatted URL, such as "http://www.url.com?id=2380" which doesn't
1717 use a slash separator as it is supposed to, we need to check for a
1718 ?-letter as well! */
1719 pathsep = strchr(protsep, '?');
1725 /* If the new part contains a space, this is a mighty stupid redirect
1726 but we still make an effort to do "right". To the left of a '?'
1727 letter we replace each space with %20 while it is replaced with '+'
1728 on the right side of the '?' letter.
1730 newlen = strlen_url(useurl);
1732 urllen = strlen(url_clone);
1734 newest = malloc( urllen + 1 + /* possible slash */
1735 newlen + 1 /* zero byte */);
1738 free(url_clone); /* don't leak this */
1742 /* copy over the root url part */
1743 memcpy(newest, url_clone, urllen);
1745 /* check if we need to append a slash */
1746 if(('/' == useurl[0]) || (protsep && !*protsep) || ('?' == useurl[0]))
1749 newest[urllen++]='/';
1751 /* then append the new piece on the right side */
1752 strcpy_url(&newest[urllen], useurl);
1758 #endif /* CURL_DISABLE_HTTP */
1761 * Curl_follow() handles the URL redirect magic. Pass in the 'newurl' string
1762 * as given by the remote server and set up the new URL to request.
1764 CURLcode Curl_follow(struct SessionHandle *data,
1765 char *newurl, /* this 'newurl' is the Location: string,
1766 and it must be malloc()ed before passed
1768 followtype type) /* see transfer.h */
1770 #ifdef CURL_DISABLE_HTTP
1774 /* Location: following will not happen when HTTP is disabled */
1775 return CURLE_TOO_MANY_REDIRECTS;
1778 /* Location: redirect */
1779 bool disallowport = FALSE;
1781 if(type == FOLLOW_REDIR) {
1782 if((data->set.maxredirs != -1) &&
1783 (data->set.followlocation >= data->set.maxredirs)) {
1784 failf(data,"Maximum (%ld) redirects followed", data->set.maxredirs);
1785 return CURLE_TOO_MANY_REDIRECTS;
1788 /* mark the next request as a followed location: */
1789 data->state.this_is_a_follow = TRUE;
1791 data->set.followlocation++; /* count location-followers */
1793 if(data->set.http_auto_referer) {
1794 /* We are asked to automatically set the previous URL as the referer
1795 when we get the next URL. We pick the ->url field, which may or may
1796 not be 100% correct */
1798 if(data->change.referer_alloc)
1799 /* If we already have an allocated referer, free this first */
1800 free(data->change.referer);
1802 data->change.referer = strdup(data->change.url);
1803 if (!data->change.referer) {
1804 data->change.referer_alloc = FALSE;
1805 return CURLE_OUT_OF_MEMORY;
1807 data->change.referer_alloc = TRUE; /* yes, free this later */
1811 if(!is_absolute_url(newurl)) {
1813 *DANG* this is an RFC 2068 violation. The URL is supposed
1814 to be absolute and this doesn't seem to be that!
1816 char *absolute = concat_url(data->change.url, newurl);
1818 return CURLE_OUT_OF_MEMORY;
1823 /* This is an absolute URL, don't allow the custom port number */
1824 disallowport = TRUE;
1826 if(strchr(newurl, ' ')) {
1827 /* This new URL contains at least one space, this is a mighty stupid
1828 redirect but we still make an effort to do "right". */
1830 size_t newlen = strlen_url(newurl);
1832 newest = malloc(newlen+1); /* get memory for this */
1834 return CURLE_OUT_OF_MEMORY;
1835 strcpy_url(newest, newurl); /* create a space-free URL */
1837 free(newurl); /* that was no good */
1838 newurl = newest; /* use this instead now */
1843 if(type == FOLLOW_FAKE) {
1844 /* we're only figuring out the new url if we would've followed locations
1845 but now we're done so we can get out! */
1846 data->info.wouldredirect = newurl;
1851 data->state.allow_port = FALSE;
1853 if(data->change.url_alloc)
1854 free(data->change.url);
1856 data->change.url_alloc = TRUE; /* the URL is allocated */
1858 data->change.url = newurl;
1859 newurl = NULL; /* don't free! */
1861 infof(data, "Issue another request to this URL: '%s'\n", data->change.url);
1864 * We get here when the HTTP code is 300-399 (and 401). We need to perform
1865 * differently based on exactly what return code there was.
1867 * News from 7.10.6: we can also get here on a 401 or 407, in case we act on
1868 * a HTTP (proxy-) authentication scheme other than Basic.
1870 switch(data->info.httpcode) {
1871 /* 401 - Act on a WWW-Authenticate, we keep on moving and do the
1872 Authorization: XXXX header in the HTTP request code snippet */
1873 /* 407 - Act on a Proxy-Authenticate, we keep on moving and do the
1874 Proxy-Authorization: XXXX header in the HTTP request code snippet */
1875 /* 300 - Multiple Choices */
1876 /* 306 - Not used */
1877 /* 307 - Temporary Redirect */
1878 default: /* for all above (and the unknown ones) */
1879 /* Some codes are explicitly mentioned since I've checked RFC2616 and they
1880 * seem to be OK to POST to.
1883 case 301: /* Moved Permanently */
1884 /* (quote from RFC2616, section 10.3.2):
1886 * Note: When automatically redirecting a POST request after receiving a
1887 * 301 status code, some existing HTTP/1.0 user agents will erroneously
1888 * change it into a GET request.
1892 * Warning: Because most of importants user agents do this obvious RFC2616
1893 * violation, many webservers expect this misbehavior. So these servers
1894 * often answers to a POST request with an error page. To be sure that
1895 * libcurl gets the page that most user agents would get, libcurl has to
1898 * This behaviour can be overridden with CURLOPT_POSTREDIR.
1900 if( (data->set.httpreq == HTTPREQ_POST
1901 || data->set.httpreq == HTTPREQ_POST_FORM)
1902 && !data->set.post301) {
1904 "Violate RFC 2616/10.3.2 and switch from POST to GET\n");
1905 data->set.httpreq = HTTPREQ_GET;
1908 case 302: /* Found */
1911 Note: RFC 1945 and RFC 2068 specify that the client is not allowed
1912 to change the method on the redirected request. However, most
1913 existing user agent implementations treat 302 as if it were a 303
1914 response, performing a GET on the Location field-value regardless
1915 of the original request method. The status codes 303 and 307 have
1916 been added for servers that wish to make unambiguously clear which
1917 kind of reaction is expected of the client.
1921 Note: Many pre-HTTP/1.1 user agents do not understand the 303
1922 status. When interoperability with such clients is a concern, the
1923 302 status code may be used instead, since most user agents react
1924 to a 302 response as described here for 303.
1926 This behaviour can be overriden with CURLOPT_POSTREDIR
1928 if( (data->set.httpreq == HTTPREQ_POST
1929 || data->set.httpreq == HTTPREQ_POST_FORM)
1930 && !data->set.post302) {
1932 "Violate RFC 2616/10.3.3 and switch from POST to GET\n");
1933 data->set.httpreq = HTTPREQ_GET;
1937 case 303: /* See Other */
1938 /* Disable both types of POSTs, since doing a second POST when
1939 * following isn't what anyone would want! */
1940 if(data->set.httpreq != HTTPREQ_GET) {
1941 data->set.httpreq = HTTPREQ_GET; /* enforce GET request */
1942 infof(data, "Disables POST, goes with %s\n",
1943 data->set.opt_no_body?"HEAD":"GET");
1946 case 304: /* Not Modified */
1947 /* 304 means we did a conditional request and it was "Not modified".
1948 * We shouldn't get any Location: header in this response!
1951 case 305: /* Use Proxy */
1952 /* (quote from RFC2616, section 10.3.6):
1953 * "The requested resource MUST be accessed through the proxy given
1954 * by the Location field. The Location field gives the URI of the
1955 * proxy. The recipient is expected to repeat this single request
1956 * via the proxy. 305 responses MUST only be generated by origin
1961 Curl_pgrsTime(data, TIMER_REDIRECT);
1962 Curl_pgrsResetTimes(data);
1965 #endif /* CURL_DISABLE_HTTP */
1969 connect_host(struct SessionHandle *data,
1970 struct connectdata **conn)
1972 CURLcode res = CURLE_OK;
1975 bool protocol_done=TRUE; /* will be TRUE always since this is only used
1976 within the easy interface */
1977 Curl_pgrsTime(data, TIMER_STARTSINGLE);
1978 res = Curl_connect(data, conn, &async, &protocol_done);
1980 if((CURLE_OK == res) && async) {
1981 /* Now, if async is TRUE here, we need to wait for the name
1983 res = Curl_wait_for_resolv(*conn, NULL);
1985 /* Resolved, continue with the connection */
1986 res = Curl_async_resolved(*conn, &protocol_done);
1988 /* if we can't resolve, we kill this "connection" now */
1989 (void)Curl_disconnect(*conn, /* dead_connection */ FALSE);
1996 Curl_reconnect_request(struct connectdata **connp)
1998 CURLcode result = CURLE_OK;
1999 struct connectdata *conn = *connp;
2000 struct SessionHandle *data = conn->data;
2002 /* This was a re-use of a connection and we got a write error in the
2003 * DO-phase. Then we DISCONNECT this connection and have another attempt to
2004 * CONNECT and then DO again! The retry cannot possibly find another
2005 * connection to re-use, since we only keep one possible connection for
2008 infof(data, "Re-used connection seems dead, get a new one\n");
2010 conn->bits.close = TRUE; /* enforce close of this connection */
2011 result = Curl_done(&conn, result, FALSE); /* we are so done with this */
2013 /* conn may no longer be a good pointer */
2016 * According to bug report #1330310. We need to check for CURLE_SEND_ERROR
2017 * here as well. I figure this could happen when the request failed on a FTP
2018 * connection and thus Curl_done() itself tried to use the connection
2019 * (again). Slight Lack of feedback in the report, but I don't think this
2020 * extra check can do much harm.
2022 if((CURLE_OK == result) || (CURLE_SEND_ERROR == result)) {
2024 bool protocol_done = TRUE;
2026 /* Now, redo the connect and get a new connection */
2027 result = Curl_connect(data, connp, &async, &protocol_done);
2028 if(CURLE_OK == result) {
2029 /* We have connected or sent away a name resolve query fine */
2031 conn = *connp; /* setup conn to again point to something nice */
2033 /* Now, if async is TRUE here, we need to wait for the name
2035 result = Curl_wait_for_resolv(conn, NULL);
2039 /* Resolved, continue with the connection */
2040 result = Curl_async_resolved(conn, &protocol_done);
2050 /* Returns CURLE_OK *and* sets '*url' if a request retry is wanted.
2052 NOTE: that the *url is malloc()ed. */
2053 CURLcode Curl_retry_request(struct connectdata *conn,
2056 struct SessionHandle *data = conn->data;
2060 /* if we're talking upload, we can't do the checks below, unless the protocol
2061 is HTTP as when uploading over HTTP we will still get a response */
2062 if(data->set.upload && !(conn->protocol&(PROT_HTTP|PROT_RTSP)))
2065 if(/* workaround for broken TLS servers */ data->state.ssl_connect_retry ||
2066 ((data->req.bytecount +
2067 data->req.headerbytecount == 0) &&
2069 !data->set.opt_no_body &&
2070 data->set.rtspreq != RTSPREQ_RECEIVE)) {
2071 /* We got no data, we attempted to re-use a connection and yet we want a
2072 "body". This might happen if the connection was left alive when we were
2073 done using it before, but that was closed when we wanted to read from
2074 it again. Bad luck. Retry the same request on a fresh connect! */
2075 infof(conn->data, "Connection died, retrying a fresh connect\n");
2076 *url = strdup(conn->data->change.url);
2078 return CURLE_OUT_OF_MEMORY;
2080 conn->bits.close = TRUE; /* close this connection */
2081 conn->bits.retry = TRUE; /* mark this as a connection we're about
2082 to retry. Marking it this way should
2083 prevent i.e HTTP transfers to return
2084 error just because nothing has been
2090 static CURLcode Curl_do_perform(struct SessionHandle *data)
2094 struct connectdata *conn=NULL;
2095 char *newurl = NULL; /* possibly a new URL to follow to! */
2096 followtype follow = FOLLOW_NONE;
2098 data->state.used_interface = Curl_if_easy;
2100 res = Curl_pretransfer(data);
2105 * It is important that there is NO 'return' from this function at any other
2106 * place than falling down to the end of the function! This is because we
2107 * have cleanup stuff that must be done before we get back, and that is only
2108 * performed after this do-while loop.
2112 res = connect_host(data, &conn); /* primary connection */
2114 if(res == CURLE_OK) {
2116 if(data->set.connect_only) {
2117 /* keep connection open for application to use the socket */
2118 conn->bits.close = FALSE;
2119 res = Curl_done(&conn, CURLE_OK, FALSE);
2122 res = Curl_do(&conn, &do_done);
2124 if(res == CURLE_OK) {
2125 if(conn->data->set.wildcardmatch) {
2126 if(conn->data->wildcard.state == CURLWC_DONE ||
2127 conn->data->wildcard.state == CURLWC_SKIP) {
2128 /* keep connection open for application to use the socket */
2129 conn->bits.close = FALSE;
2130 res = Curl_done(&conn, CURLE_OK, FALSE);
2134 res = Transfer(conn); /* now fetch that URL please */
2135 if((res == CURLE_OK) || (res == CURLE_RECV_ERROR)) {
2137 CURLcode rc = Curl_retry_request(conn, &newurl);
2141 retry = (newurl?TRUE:FALSE);
2144 /* we know (newurl != NULL) at this point */
2146 follow = FOLLOW_RETRY;
2148 else if (res == CURLE_OK) {
2150 * We must duplicate the new URL here as the connection data may
2151 * be free()ed in the Curl_done() function. We prefer the newurl
2152 * one since that's used for redirects or just further requests
2153 * for retries or multi-stage HTTP auth methods etc.
2155 if(data->req.newurl) {
2156 follow = FOLLOW_REDIR;
2157 newurl = strdup(data->req.newurl);
2159 res = CURLE_OUT_OF_MEMORY;
2161 else if(data->req.location) {
2162 follow = FOLLOW_FAKE;
2163 newurl = strdup(data->req.location);
2165 res = CURLE_OUT_OF_MEMORY;
2169 /* in the above cases where 'newurl' gets assigned, we have a fresh
2170 * allocated memory pointed to */
2172 if(res != CURLE_OK) {
2173 /* The transfer phase returned error, we mark the connection to get
2174 * closed to prevent being re-used. This is because we can't
2175 * possibly know if the connection is in a good shape or not now. */
2176 conn->bits.close = TRUE;
2178 if(CURL_SOCKET_BAD != conn->sock[SECONDARYSOCKET]) {
2179 /* if we failed anywhere, we must clean up the secondary socket if
2181 sclose(conn->sock[SECONDARYSOCKET]);
2182 conn->sock[SECONDARYSOCKET] = CURL_SOCKET_BAD;
2186 /* Always run Curl_done(), even if some of the previous calls
2187 failed, but return the previous (original) error code */
2188 res2 = Curl_done(&conn, res, FALSE);
2194 /* Curl_do() failed, clean up left-overs in the done-call, but note
2195 that at some cases the conn pointer is NULL when Curl_do() failed
2196 and the connection cache is very small so only call Curl_done() if
2197 conn is still "alive". */
2198 /* ignore return code since we already have an error to return */
2199 (void)Curl_done(&conn, res, FALSE);
2202 * Important: 'conn' cannot be used here, since it may have been closed
2203 * in 'Curl_done' or other functions.
2206 if((res == CURLE_OK) && follow) {
2207 res = Curl_follow(data, newurl, follow);
2208 if(CURLE_OK == res) {
2209 /* if things went fine, Curl_follow() freed or otherwise took
2210 responsibility for the newurl pointer */
2212 if(follow >= FOLLOW_RETRY) {
2213 follow = FOLLOW_NONE;
2216 /* else we break out of the loop below */
2220 break; /* it only reaches here when this shouldn't loop */
2222 } /* loop if Location: */
2227 if(res && !data->state.errorbuf) {
2229 * As an extra precaution: if no error string has been set and there was
2230 * an error, use the strerror() string or if things are so bad that not
2231 * even that is good, set a bad string that mentions the error code.
2233 const char *str = curl_easy_strerror(res);
2235 failf(data, "unspecified error %d", (int)res);
2237 failf(data, "%s", str);
2240 /* run post-transfer unconditionally, but don't clobber the return code if
2241 we already have an error code recorder */
2242 res2 = Curl_posttransfer(data);
2250 * Curl_perform() is the internal high-level function that gets called by the
2251 * external curl_easy_perform() function. It inits, performs and cleans up a
2252 * single file transfer.
2254 CURLcode Curl_perform(struct SessionHandle *data)
2257 if(!data->set.wildcardmatch)
2258 return Curl_do_perform(data);
2260 /* init main wildcard structures */
2261 res = Curl_wildcard_init(&data->wildcard);
2265 res = Curl_do_perform(data);
2267 Curl_wildcard_dtor(&data->wildcard);
2272 while(!res && data->wildcard.state != CURLWC_DONE)
2273 res = Curl_do_perform(data);
2275 Curl_wildcard_dtor(&data->wildcard);
2277 /* wildcard download finished or failed */
2278 data->wildcard.state = CURLWC_INIT;
2283 * Curl_setup_transfer() is called to setup some basic properties for the
2284 * upcoming transfer.
2287 Curl_setup_transfer(
2288 struct connectdata *conn, /* connection data */
2289 int sockindex, /* socket index to read from or -1 */
2290 curl_off_t size, /* -1 if unknown at this point */
2291 bool getheader, /* TRUE if header parsing is wanted */
2292 curl_off_t *bytecountp, /* return number of bytes read or NULL */
2293 int writesockindex, /* socket index to write to, it may very well be
2294 the same we read from. -1 disables */
2295 curl_off_t *writecountp /* return number of bytes written or NULL */
2298 struct SessionHandle *data;
2299 struct SingleRequest *k;
2301 DEBUGASSERT(conn != NULL);
2306 DEBUGASSERT((sockindex <= 1) && (sockindex >= -1));
2308 /* now copy all input parameters */
2309 conn->sockfd = sockindex == -1 ?
2310 CURL_SOCKET_BAD : conn->sock[sockindex];
2311 conn->writesockfd = writesockindex == -1 ?
2312 CURL_SOCKET_BAD:conn->sock[writesockindex];
2313 k->getheader = getheader;
2316 k->bytecountp = bytecountp;
2317 k->writebytecountp = writecountp;
2319 /* The code sequence below is placed in this function just because all
2320 necessary input is not always known in do_complete() as this function may
2321 be called after that */
2326 Curl_pgrsSetDownloadSize(data, size);
2328 /* we want header and/or body, if neither then don't do this! */
2329 if(k->getheader || !data->set.opt_no_body) {
2331 if(conn->sockfd != CURL_SOCKET_BAD)
2332 k->keepon |= KEEP_RECV;
2334 if(conn->writesockfd != CURL_SOCKET_BAD) {
2337 Even if we require a 100-return code before uploading data, we might
2338 need to write data before that since the REQUEST may not have been
2339 finished sent off just yet.
2341 Thus, we must check if the request has been sent before we set the
2342 state info where we wait for the 100-return code
2344 if((data->state.expect100header) &&
2345 (data->state.proto.http->sending == HTTPSEND_BODY)) {
2346 /* wait with write until we either got 100-continue or a timeout */
2347 k->exp100 = EXP100_AWAITING_CONTINUE;
2348 k->start100 = k->start;
2350 /* set a timeout for the multi interface */
2351 Curl_expire(data, CURL_TIMEOUT_EXPECT_100);
2354 if(data->state.expect100header)
2355 /* when we've sent off the rest of the headers, we must await a
2356 100-continue but first finish sending the request */
2357 k->exp100 = EXP100_SENDING_REQUEST;
2359 /* enable the write bit when we're not waiting for continue */
2360 k->keepon |= KEEP_SEND;
2362 } /* if(conn->writesockfd != CURL_SOCKET_BAD) */
2363 } /* if(k->getheader || !data->set.opt_no_body) */