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 #include "strtoofft.h"
29 #ifdef HAVE_SYS_SOCKET_H
30 #include <sys/socket.h>
32 #ifdef HAVE_NETINET_IN_H
33 #include <netinet/in.h>
41 #ifdef HAVE_ARPA_INET_H
42 #include <arpa/inet.h>
47 #ifdef HAVE_SYS_IOCTL_H
48 #include <sys/ioctl.h>
54 #ifdef HAVE_SYS_PARAM_H
55 #include <sys/param.h>
58 #ifdef HAVE_SYS_SELECT_H
59 #include <sys/select.h>
63 #error "We can't compile without socket() support!"
67 #include <curl/curl.h>
70 #include "content_encoding.h"
74 #include "speedcheck.h"
80 #include "http_digest.h"
81 #include "curl_ntlm.h"
82 #include "http_negotiate.h"
84 #include "curl_memory.h"
88 #include "non-ascii.h"
90 #define _MPRINTF_REPLACE /* use our functions only */
91 #include <curl/mprintf.h>
93 /* The last #include file should be: */
96 #define CURL_TIMEOUT_EXPECT_100 1000 /* counting ms here */
99 * This function will call the read callback to fill our buffer with data
102 CURLcode Curl_fillreadbuffer(struct connectdata *conn, int bytes, int *nreadp)
104 struct SessionHandle *data = conn->data;
105 size_t buffersize = (size_t)bytes;
107 #ifdef CURL_DOES_CONVERSIONS
108 bool sending_http_headers = FALSE;
110 if((conn->handler->protocol&(CURLPROTO_HTTP|CURLPROTO_RTSP)) &&
111 (data->state.proto.http->sending == HTTPSEND_REQUEST)) {
112 /* We're sending the HTTP request headers, not the data.
113 Remember that so we don't re-translate them into garbage. */
114 sending_http_headers = TRUE;
118 if(data->req.upload_chunky) {
119 /* if chunked Transfer-Encoding */
120 buffersize -= (8 + 2 + 2); /* 32bit hex + CRLF + CRLF */
121 data->req.upload_fromhere += (8 + 2); /* 32bit hex + CRLF */
124 /* this function returns a size_t, so we typecast to int to prevent warnings
125 with picky compilers */
126 nread = (int)conn->fread_func(data->req.upload_fromhere, 1,
127 buffersize, conn->fread_in);
129 if(nread == CURL_READFUNC_ABORT) {
130 failf(data, "operation aborted by callback");
132 return CURLE_ABORTED_BY_CALLBACK;
134 else if(nread == CURL_READFUNC_PAUSE) {
135 struct SingleRequest *k = &data->req;
136 /* CURL_READFUNC_PAUSE pauses read callbacks that feed socket writes */
137 k->keepon |= KEEP_SEND_PAUSE; /* mark socket send as paused */
138 if(data->req.upload_chunky) {
139 /* Back out the preallocation done above */
140 data->req.upload_fromhere -= (8 + 2);
143 return CURLE_OK; /* nothing was read */
145 else if((size_t)nread > buffersize) {
146 /* the read function returned a too large value */
148 failf(data, "read function returned funny value");
149 return CURLE_READ_ERROR;
152 if(!data->req.forbidchunk && data->req.upload_chunky) {
153 /* if chunked Transfer-Encoding
159 /* On non-ASCII platforms the <DATA> may or may not be
160 translated based on set.prefer_ascii while the protocol
161 portion must always be translated to the network encoding.
162 To further complicate matters, line end conversion might be
163 done later on, so we need to prevent CRLFs from becoming
164 CRCRLFs if that's the case. To do this we use bare LFs
165 here, knowing they'll become CRLFs later on.
169 const char *endofline_native;
170 const char *endofline_network;
174 #ifdef CURL_DO_LINEEND_CONV
175 (data->set.prefer_ascii) ||
178 /* \n will become \r\n later on */
179 endofline_native = "\n";
180 endofline_network = "\x0a";
183 endofline_native = "\r\n";
184 endofline_network = "\x0d\x0a";
186 hexlen = snprintf(hexbuffer, sizeof(hexbuffer),
187 "%x%s", nread, endofline_native);
189 /* move buffer pointer */
190 data->req.upload_fromhere -= hexlen;
193 /* copy the prefix to the buffer, leaving out the NUL */
194 memcpy(data->req.upload_fromhere, hexbuffer, hexlen);
196 /* always append ASCII CRLF to the data */
197 memcpy(data->req.upload_fromhere + nread,
199 strlen(endofline_network));
201 #ifdef CURL_DOES_CONVERSIONS
204 if(data->set.prefer_ascii) {
205 /* translate the protocol and data */
209 /* just translate the protocol portion */
210 length = strlen(hexbuffer);
212 res = Curl_convert_to_network(data, data->req.upload_fromhere, length);
213 /* Curl_convert_to_network calls failf if unsuccessful */
216 #endif /* CURL_DOES_CONVERSIONS */
218 if((nread - hexlen) == 0)
219 /* mark this as done once this chunk is transferred */
220 data->req.upload_done = TRUE;
222 nread+=(int)strlen(endofline_native); /* for the added end of line */
224 #ifdef CURL_DOES_CONVERSIONS
225 else if((data->set.prefer_ascii) && (!sending_http_headers)) {
227 res = Curl_convert_to_network(data, data->req.upload_fromhere, nread);
228 /* Curl_convert_to_network calls failf if unsuccessful */
232 #endif /* CURL_DOES_CONVERSIONS */
241 * Curl_readrewind() rewinds the read stream. This is typically used for HTTP
242 * POST/PUT with multi-pass authentication when a sending was denied and a
243 * resend is necessary.
245 CURLcode Curl_readrewind(struct connectdata *conn)
247 struct SessionHandle *data = conn->data;
249 conn->bits.rewindaftersend = FALSE; /* we rewind now */
251 /* explicitly switch off sending data on this connection now since we are
252 about to restart a new transfer and thus we want to avoid inadvertently
253 sending more data on the existing connection until the next transfer
255 data->req.keepon &= ~KEEP_SEND;
257 /* We have sent away data. If not using CURLOPT_POSTFIELDS or
258 CURLOPT_HTTPPOST, call app to rewind
260 if(data->set.postfields ||
261 (data->set.httpreq == HTTPREQ_POST_FORM))
264 if(data->set.seek_func) {
267 err = (data->set.seek_func)(data->set.seek_client, 0, SEEK_SET);
269 failf(data, "seek callback returned error %d", (int)err);
270 return CURLE_SEND_FAIL_REWIND;
273 else if(data->set.ioctl_func) {
276 err = (data->set.ioctl_func)(data, CURLIOCMD_RESTARTREAD,
277 data->set.ioctl_client);
278 infof(data, "the ioctl callback returned %d\n", (int)err);
281 /* FIXME: convert to a human readable error message */
282 failf(data, "ioctl callback returned error %d", (int)err);
283 return CURLE_SEND_FAIL_REWIND;
287 /* If no CURLOPT_READFUNCTION is used, we know that we operate on a
288 given FILE * stream and we can actually attempt to rewind that
289 ourself with fseek() */
290 if(data->set.fread_func == (curl_read_callback)fread) {
291 if(-1 != fseek(data->set.in, 0, SEEK_SET))
292 /* successful rewind */
296 /* no callback set or failure above, makes us fail at once */
297 failf(data, "necessary data rewind wasn't possible");
298 return CURLE_SEND_FAIL_REWIND;
304 static int data_pending(const struct connectdata *conn)
306 /* in the case of libssh2, we can never be really sure that we have emptied
307 its internal buffers so we MUST always try until we get EAGAIN back */
308 return conn->handler->protocol&(CURLPROTO_SCP|CURLPROTO_SFTP) ||
309 Curl_ssl_data_pending(conn, FIRSTSOCKET);
312 static void read_rewind(struct connectdata *conn,
315 DEBUGASSERT(conn->read_pos >= thismuch);
317 conn->read_pos -= thismuch;
318 conn->bits.stream_was_rewound = TRUE;
325 show = CURLMIN(conn->buf_len - conn->read_pos, sizeof(buf)-1);
326 if(conn->master_buffer) {
327 memcpy(buf, conn->master_buffer + conn->read_pos, show);
334 DEBUGF(infof(conn->data,
335 "Buffer after stream rewind (read_pos = %zu): [%s]",
336 conn->read_pos, buf));
342 * Check to see if CURLOPT_TIMECONDITION was met by comparing the time of the
343 * remote document with the time provided by CURLOPT_TIMEVAL
345 bool Curl_meets_timecondition(struct SessionHandle *data, time_t timeofdoc)
347 if((timeofdoc == 0) || (data->set.timevalue == 0))
350 switch(data->set.timecondition) {
351 case CURL_TIMECOND_IFMODSINCE:
353 if(timeofdoc <= data->set.timevalue) {
355 "The requested document is not new enough\n");
356 data->info.timecond = TRUE;
360 case CURL_TIMECOND_IFUNMODSINCE:
361 if(timeofdoc >= data->set.timevalue) {
363 "The requested document is not old enough\n");
364 data->info.timecond = TRUE;
374 * Go ahead and do a read if we have a readable socket or if
375 * the stream was rewound (in which case we have data in a
378 static CURLcode readwrite_data(struct SessionHandle *data,
379 struct connectdata *conn,
380 struct SingleRequest *k,
381 int *didwhat, bool *done)
383 CURLcode result = CURLE_OK;
384 ssize_t nread; /* number of bytes read */
385 size_t excess = 0; /* excess bytes read */
386 bool is_empty_data = FALSE;
387 bool readmore = FALSE; /* used by RTP to signal for more data */
391 /* This is where we loop until we have read everything there is to
392 read or we get a CURLE_AGAIN */
394 size_t buffersize = data->set.buffer_size?
395 data->set.buffer_size : BUFSIZE;
396 size_t bytestoread = buffersize;
398 if(k->size != -1 && !k->header) {
399 /* make sure we don't read "too much" if we can help it since we
400 might be pipelining and then someone else might want to read what
402 curl_off_t totalleft = k->size - k->bytecount;
403 if(totalleft < (curl_off_t)bytestoread)
404 bytestoread = (size_t)totalleft;
408 /* receive data from the network! */
409 result = Curl_read(conn, conn->sockfd, k->buf, bytestoread, &nread);
411 /* read would've blocked */
412 if(CURLE_AGAIN == result)
413 break; /* get out of loop */
419 /* read nothing but since we wanted nothing we consider this an OK
420 situation to proceed from */
424 if((k->bytecount == 0) && (k->writebytecount == 0)) {
425 Curl_pgrsTime(data, TIMER_STARTTRANSFER);
426 if(k->exp100 > EXP100_SEND_DATA)
427 /* set time stamp to compare with when waiting for the 100 */
428 k->start100 = Curl_tvnow();
431 *didwhat |= KEEP_RECV;
432 /* indicates data of zero size, i.e. empty file */
433 is_empty_data = (bool)((nread == 0) && (k->bodywrites == 0));
435 /* NUL terminate, allowing string ops to be used */
436 if(0 < nread || is_empty_data) {
439 else if(0 >= nread) {
440 /* if we receive 0 or less here, the server closed the connection
441 and we bail out from this! */
442 DEBUGF(infof(data, "nread <= 0, server closed connection, bailing\n"));
443 k->keepon &= ~KEEP_RECV;
447 /* Default buffer to use when we write the buffer, it may be changed
448 in the flow below before the actual storing is done. */
451 if(conn->handler->readwrite) {
452 result = conn->handler->readwrite(data, conn, &nread, &readmore);
459 #ifndef CURL_DISABLE_HTTP
460 /* Since this is a two-state thing, we check if we are parsing
461 headers at the moment or not. */
463 /* we are in parse-the-header-mode */
464 bool stop_reading = FALSE;
465 result = Curl_http_readwrite_headers(data, conn, &nread, &stop_reading);
469 if(conn->handler->readwrite &&
470 (k->maxdownload <= 0 && nread > 0)) {
471 result = conn->handler->readwrite(data, conn, &nread, &readmore);
479 /* We've stopped dealing with input, get out of the do-while loop */
482 if(conn->data->multi && Curl_multi_canPipeline(conn->data->multi)) {
484 "Rewinding stream by : %zd"
485 " bytes on url %s (zero-length body)\n",
486 nread, data->state.path);
487 read_rewind(conn, (size_t)nread);
491 "Excess found in a non pipelined read:"
493 " url = %s (zero-length body)\n",
494 nread, data->state.path);
501 #endif /* CURL_DISABLE_HTTP */
504 /* This is not an 'else if' since it may be a rest from the header
505 parsing, where the beginning of the buffer is headers and the end
507 if(k->str && !k->header && (nread > 0 || is_empty_data)) {
509 #ifndef CURL_DISABLE_HTTP
510 if(0 == k->bodywrites && !is_empty_data) {
511 /* These checks are only made the first time we are about to
512 write a piece of the body */
513 if(conn->handler->protocol&(CURLPROTO_HTTP|CURLPROTO_RTSP)) {
514 /* HTTP-only checks */
516 if(data->req.newurl) {
517 if(conn->bits.close) {
518 /* Abort after the headers if "follow Location" is set
519 and we're set to close anyway. */
520 k->keepon &= ~KEEP_RECV;
524 /* We have a new url to load, but since we want to be able
525 to re-use this connection properly, we read the full
526 response in "ignore more" */
527 k->ignorebody = TRUE;
528 infof(data, "Ignoring the response-body\n");
530 if(data->state.resume_from && !k->content_range &&
531 (data->set.httpreq==HTTPREQ_GET) &&
533 /* we wanted to resume a download, although the server doesn't
534 * seem to support this and we did this with a GET (if it
535 * wasn't a GET we did a POST or PUT resume) */
536 failf(data, "HTTP server doesn't seem to support "
537 "byte ranges. Cannot resume.");
538 return CURLE_RANGE_ERROR;
541 if(data->set.timecondition && !data->state.range) {
542 /* A time condition has been set AND no ranges have been
543 requested. This seems to be what chapter 13.3.4 of
544 RFC 2616 defines to be the correct action for a
547 if(!Curl_meets_timecondition(data, k->timeofdoc)) {
549 /* we abort the transfer before it is completed == we ruin the
550 re-use ability. Close the connection */
551 conn->bits.close = TRUE;
554 } /* we have a time condition */
556 } /* this is HTTP or RTSP */
557 } /* this is the first time we write a body part */
558 #endif /* CURL_DISABLE_HTTP */
562 /* pass data to the debug function before it gets "dechunked" */
563 if(data->set.verbose) {
565 Curl_debug(data, CURLINFO_DATA_IN, data->state.headerbuff,
566 (size_t)k->hbuflen, conn);
567 if(k->badheader == HEADER_PARTHEADER)
568 Curl_debug(data, CURLINFO_DATA_IN,
569 k->str, (size_t)nread, conn);
572 Curl_debug(data, CURLINFO_DATA_IN,
573 k->str, (size_t)nread, conn);
576 #ifndef CURL_DISABLE_HTTP
579 * Here comes a chunked transfer flying and we need to decode this
580 * properly. While the name says read, this function both reads
581 * and writes away the data. The returned 'nread' holds the number
582 * of actual data it wrote to the client.
586 Curl_httpchunk_read(conn, k->str, nread, &nread);
588 if(CHUNKE_OK < res) {
589 if(CHUNKE_WRITE_ERROR == res) {
590 failf(data, "Failed writing data");
591 return CURLE_WRITE_ERROR;
593 failf(data, "Problem (%d) in the Chunked-Encoded data", (int)res);
594 return CURLE_RECV_ERROR;
596 else if(CHUNKE_STOP == res) {
598 /* we're done reading chunks! */
599 k->keepon &= ~KEEP_RECV; /* read no more */
601 /* There are now possibly N number of bytes at the end of the
602 str buffer that weren't written to the client.
604 We DO care about this data if we are pipelining.
605 Push it back to be read on the next pass. */
607 dataleft = conn->chunk.dataleft;
609 infof(conn->data, "Leftovers after chunking: %zu bytes", dataleft);
610 if(conn->data->multi &&
611 Curl_multi_canPipeline(conn->data->multi)) {
612 /* only attempt the rewind if we truly are pipelining */
613 infof(conn->data, "Rewinding %zu bytes\n",dataleft);
614 read_rewind(conn, dataleft);
618 /* If it returned OK, we just keep going */
620 #endif /* CURL_DISABLE_HTTP */
622 /* Account for body content stored in the header buffer */
623 if(k->badheader && !k->ignorebody) {
624 DEBUGF(infof(data, "Increasing bytecount by %zu from hbuflen\n",
626 k->bytecount += k->hbuflen;
629 if((-1 != k->maxdownload) &&
630 (k->bytecount + nread >= k->maxdownload)) {
632 excess = (size_t)(k->bytecount + nread - k->maxdownload);
633 if(excess > 0 && !k->ignorebody) {
634 if(conn->data->multi && Curl_multi_canPipeline(conn->data->multi)) {
635 /* The 'excess' amount below can't be more than BUFSIZE which
636 always will fit in a size_t */
638 "Rewinding stream by : %zu"
639 " bytes on url %s (size = %" FORMAT_OFF_T
640 ", maxdownload = %" FORMAT_OFF_T
641 ", bytecount = %" FORMAT_OFF_T ", nread = %zd)\n",
642 excess, data->state.path,
643 k->size, k->maxdownload, k->bytecount, nread);
644 read_rewind(conn, excess);
648 "Excess found in a non pipelined read:"
650 ", size = %" FORMAT_OFF_T
651 ", maxdownload = %" FORMAT_OFF_T
652 ", bytecount = %" FORMAT_OFF_T "\n",
653 excess, k->size, k->maxdownload, k->bytecount);
657 nread = (ssize_t) (k->maxdownload - k->bytecount);
658 if(nread < 0 ) /* this should be unusual */
661 k->keepon &= ~KEEP_RECV; /* we're done reading */
664 k->bytecount += nread;
666 Curl_pgrsSetDownloadCounter(data, k->bytecount);
668 if(!k->chunk && (nread || k->badheader || is_empty_data)) {
669 /* If this is chunky transfer, it was already written */
671 if(k->badheader && !k->ignorebody) {
672 /* we parsed a piece of data wrongly assuming it was a header
673 and now we output it as body instead */
675 /* Don't let excess data pollute body writes */
676 if(k->maxdownload == -1 || (curl_off_t)k->hbuflen <= k->maxdownload)
677 result = Curl_client_write(conn, CLIENTWRITE_BODY,
678 data->state.headerbuff,
681 result = Curl_client_write(conn, CLIENTWRITE_BODY,
682 data->state.headerbuff,
683 (size_t)k->maxdownload);
688 if(k->badheader < HEADER_ALLBAD) {
689 /* This switch handles various content encodings. If there's an
690 error here, be sure to check over the almost identical code
692 Make sure that ALL_CONTENT_ENCODINGS contains all the
693 encodings handled here. */
695 switch (conn->data->set.http_ce_skip ?
696 IDENTITY : k->auto_decoding) {
699 /* This is the default when the server sends no
700 Content-Encoding header. See Curl_readwrite_init; the
701 memset() call initializes k->auto_decoding to zero. */
704 #ifndef CURL_DISABLE_POP3
705 if(conn->handler->protocol&CURLPROTO_POP3)
706 result = Curl_pop3_write(conn, k->str, nread);
708 #endif /* CURL_DISABLE_POP3 */
710 result = Curl_client_write(conn, CLIENTWRITE_BODY, k->str,
717 /* Assume CLIENTWRITE_BODY; headers are not encoded. */
719 result = Curl_unencode_deflate_write(conn, k, nread);
723 /* Assume CLIENTWRITE_BODY; headers are not encoded. */
725 result = Curl_unencode_gzip_write(conn, k, nread);
730 failf (data, "Unrecognized content encoding type. "
731 "libcurl understands `identity', `deflate' and `gzip' "
732 "content encodings.");
733 result = CURLE_BAD_CONTENT_ENCODING;
738 k->badheader = HEADER_NORMAL; /* taken care of now */
744 } /* if(! header and data to read ) */
746 if(conn->handler->readwrite &&
747 (excess > 0 && !conn->bits.stream_was_rewound)) {
748 /* Parse the excess data */
750 nread = (ssize_t)excess;
752 result = conn->handler->readwrite(data, conn, &nread, &readmore);
757 k->keepon |= KEEP_RECV; /* we're not done reading */
762 /* if we received nothing, the server closed the connection and we
764 k->keepon &= ~KEEP_RECV;
767 } while(data_pending(conn));
769 if(((k->keepon & (KEEP_RECV|KEEP_SEND)) == KEEP_SEND) &&
771 /* When we've read the entire thing and the close bit is set, the server
772 may now close the connection. If there's now any kind of sending going
773 on from our side, we need to stop that immediately. */
774 infof(data, "we are done reading and this is set to close, stop send\n");
775 k->keepon &= ~KEEP_SEND; /* no writing anymore either */
782 * Send data to upload to the server, when the socket is writable.
784 static CURLcode readwrite_upload(struct SessionHandle *data,
785 struct connectdata *conn,
786 struct SingleRequest *k,
790 ssize_t bytes_written;
792 ssize_t nread; /* number of bytes read */
793 bool sending_http_headers = FALSE;
795 if((k->bytecount == 0) && (k->writebytecount == 0))
796 Curl_pgrsTime(data, TIMER_STARTTRANSFER);
798 *didwhat |= KEEP_SEND;
801 * We loop here to do the READ and SEND loop until we run out of
802 * data to send or until we get EWOULDBLOCK back
804 * FIXME: above comment is misleading. Currently no looping is
805 * actually done in do-while loop below.
809 /* only read more data if there's no upload data already
810 present in the upload buffer */
811 if(0 == data->req.upload_present) {
812 /* init the "upload from here" pointer */
813 data->req.upload_fromhere = k->uploadbuf;
815 if(!k->upload_done) {
816 /* HTTP pollution, this should be written nicer to become more
817 protocol agnostic. */
820 if((k->exp100 == EXP100_SENDING_REQUEST) &&
821 (data->state.proto.http->sending == HTTPSEND_BODY)) {
822 /* If this call is to send body data, we must take some action:
823 We have sent off the full HTTP 1.1 request, and we shall now
824 go into the Expect: 100 state and await such a header */
825 k->exp100 = EXP100_AWAITING_CONTINUE; /* wait for the header */
826 k->keepon &= ~KEEP_SEND; /* disable writing */
827 k->start100 = Curl_tvnow(); /* timeout count starts now */
828 *didwhat &= ~KEEP_SEND; /* we didn't write anything actually */
830 /* set a timeout for the multi interface */
831 Curl_expire(data, CURL_TIMEOUT_EXPECT_100);
835 if(conn->handler->protocol&(CURLPROTO_HTTP|CURLPROTO_RTSP)) {
836 if(data->state.proto.http->sending == HTTPSEND_REQUEST)
837 /* We're sending the HTTP request headers, not the data.
838 Remember that so we don't change the line endings. */
839 sending_http_headers = TRUE;
841 sending_http_headers = FALSE;
844 result = Curl_fillreadbuffer(conn, BUFSIZE, &fillcount);
848 nread = (ssize_t)fillcount;
851 nread = 0; /* we're done uploading/reading */
853 if(!nread && (k->keepon & KEEP_SEND_PAUSE)) {
854 /* this is a paused transfer */
859 k->keepon &= ~KEEP_SEND; /* we're done writing */
861 if(conn->bits.rewindaftersend) {
862 result = Curl_readrewind(conn);
869 /* store number of bytes available for upload */
870 data->req.upload_present = nread;
872 #ifndef CURL_DISABLE_SMTP
873 if(conn->handler->protocol & CURLPROTO_SMTP) {
874 result = Curl_smtp_escape_eob(conn, nread);
879 #endif /* CURL_DISABLE_SMTP */
881 /* convert LF to CRLF if so asked */
882 if((!sending_http_headers) && (
883 #ifdef CURL_DO_LINEEND_CONV
884 /* always convert if we're FTPing in ASCII mode */
885 (data->set.prefer_ascii) ||
888 if(data->state.scratch == NULL)
889 data->state.scratch = malloc(2*BUFSIZE);
890 if(data->state.scratch == NULL) {
891 failf (data, "Failed to alloc scratch buffer!");
892 return CURLE_OUT_OF_MEMORY;
895 * ASCII/EBCDIC Note: This is presumably a text (not binary)
896 * transfer so the data should already be in ASCII.
897 * That means the hex values for ASCII CR (0x0d) & LF (0x0a)
898 * must be used instead of the escape sequences \r & \n.
900 for(i = 0, si = 0; i < nread; i++, si++) {
901 if(data->req.upload_fromhere[i] == 0x0a) {
902 data->state.scratch[si++] = 0x0d;
903 data->state.scratch[si] = 0x0a;
904 if(!data->set.crlf) {
905 /* we're here only because FTP is in ASCII mode...
906 bump infilesize for the LF we just added */
907 data->set.infilesize++;
911 data->state.scratch[si] = data->req.upload_fromhere[i];
914 /* only perform the special operation if we really did replace
918 /* upload from the new (replaced) buffer instead */
919 data->req.upload_fromhere = data->state.scratch;
921 /* set the new amount too */
922 data->req.upload_present = nread;
925 } /* if 0 == data->req.upload_present */
927 /* We have a partial buffer left from a previous "round". Use
928 that instead of reading more data */
931 /* write to socket (send away data) */
932 result = Curl_write(conn,
933 conn->writesockfd, /* socket to send to */
934 data->req.upload_fromhere, /* buffer pointer */
935 data->req.upload_present, /* buffer size */
936 &bytes_written); /* actually sent */
941 if(data->set.verbose)
942 /* show the data before we change the pointer upload_fromhere */
943 Curl_debug(data, CURLINFO_DATA_OUT, data->req.upload_fromhere,
944 (size_t)bytes_written, conn);
946 k->writebytecount += bytes_written;
948 if(k->writebytecount == data->set.infilesize) {
949 /* we have sent all data we were supposed to */
950 k->upload_done = TRUE;
951 infof(data, "We are completely uploaded and fine\n");
954 if(data->req.upload_present != bytes_written) {
955 /* we only wrote a part of the buffer (if anything), deal with it! */
957 /* store the amount of bytes left in the buffer to write */
958 data->req.upload_present -= bytes_written;
960 /* advance the pointer where to find the buffer when the next send
962 data->req.upload_fromhere += bytes_written;
965 /* we've uploaded that buffer now */
966 data->req.upload_fromhere = k->uploadbuf;
967 data->req.upload_present = 0; /* no more bytes left */
970 /* switch off writing, we're done! */
971 k->keepon &= ~KEEP_SEND; /* we're done writing */
975 Curl_pgrsSetUploadCounter(data, k->writebytecount);
977 } WHILE_FALSE; /* just to break out from! */
983 * Curl_readwrite() is the low-level function to be called when data is to
984 * be read and written to/from the connection.
986 CURLcode Curl_readwrite(struct connectdata *conn,
989 struct SessionHandle *data = conn->data;
990 struct SingleRequest *k = &data->req;
994 curl_socket_t fd_read;
995 curl_socket_t fd_write;
996 int select_res = conn->cselect_bits;
998 conn->cselect_bits = 0;
1000 /* only use the proper socket if the *_HOLD bit is not set simultaneously as
1001 then we are in rate limiting state in that transfer direction */
1003 if((k->keepon & KEEP_RECVBITS) == KEEP_RECV)
1004 fd_read = conn->sockfd;
1006 fd_read = CURL_SOCKET_BAD;
1008 if((k->keepon & KEEP_SENDBITS) == KEEP_SEND)
1009 fd_write = conn->writesockfd;
1011 fd_write = CURL_SOCKET_BAD;
1013 if(!select_res) /* Call for select()/poll() only, if read/write/error
1014 status is not known. */
1015 select_res = Curl_socket_ready(fd_read, fd_write, 0);
1017 if(select_res == CURL_CSELECT_ERR) {
1018 failf(data, "select/poll returned error");
1019 return CURLE_SEND_ERROR;
1022 /* We go ahead and do a read if we have a readable socket or if
1023 the stream was rewound (in which case we have data in a
1025 if((k->keepon & KEEP_RECV) &&
1026 ((select_res & CURL_CSELECT_IN) || conn->bits.stream_was_rewound)) {
1028 result = readwrite_data(data, conn, k, &didwhat, done);
1032 else if(k->keepon & KEEP_RECV) {
1033 DEBUGF(infof(data, "additional stuff not fine %s:%d: %d %d\n",
1035 select_res & CURL_CSELECT_IN,
1036 conn->bits.stream_was_rewound));
1039 /* If we still have writing to do, we check if we have a writable socket. */
1040 if((k->keepon & KEEP_SEND) && (select_res & CURL_CSELECT_OUT)) {
1043 result = readwrite_upload(data, conn, k, &didwhat);
1048 k->now = Curl_tvnow();
1050 /* Update read/write counters */
1052 *k->bytecountp = k->bytecount; /* read count */
1053 if(k->writebytecountp)
1054 *k->writebytecountp = k->writebytecount; /* write count */
1057 /* no read no write, this is a timeout? */
1058 if(k->exp100 == EXP100_AWAITING_CONTINUE) {
1059 /* This should allow some time for the header to arrive, but only a
1060 very short time as otherwise it'll be too much wasted time too
1063 /* Quoting RFC2616, section "8.2.3 Use of the 100 (Continue) Status":
1065 Therefore, when a client sends this header field to an origin server
1066 (possibly via a proxy) from which it has never seen a 100 (Continue)
1067 status, the client SHOULD NOT wait for an indefinite period before
1068 sending the request body.
1072 long ms = Curl_tvdiff(k->now, k->start100);
1073 if(ms > CURL_TIMEOUT_EXPECT_100) {
1074 /* we've waited long enough, continue anyway */
1075 k->exp100 = EXP100_SEND_DATA;
1076 k->keepon |= KEEP_SEND;
1077 infof(data, "Done waiting for 100-continue\n");
1082 if(Curl_pgrsUpdate(conn))
1083 result = CURLE_ABORTED_BY_CALLBACK;
1085 result = Curl_speedcheck(data, k->now);
1090 if(0 > Curl_timeleft(data, &k->now, FALSE)) {
1092 failf(data, "Operation timed out after %ld milliseconds with %"
1093 FORMAT_OFF_T " out of %" FORMAT_OFF_T " bytes received",
1094 Curl_tvdiff(k->now, data->progress.t_startsingle), k->bytecount,
1098 failf(data, "Operation timed out after %ld milliseconds with %"
1099 FORMAT_OFF_T " bytes received",
1100 Curl_tvdiff(k->now, data->progress.t_startsingle), k->bytecount);
1102 return CURLE_OPERATION_TIMEDOUT;
1107 * The transfer has been performed. Just make some general checks before
1111 if(!(data->set.opt_no_body) && (k->size != -1) &&
1112 (k->bytecount != k->size) &&
1113 #ifdef CURL_DO_LINEEND_CONV
1114 /* Most FTP servers don't adjust their file SIZE response for CRLFs,
1115 so we'll check to see if the discrepancy can be explained
1116 by the number of CRLFs we've changed to LFs.
1118 (k->bytecount != (k->size + data->state.crlf_conversions)) &&
1119 #endif /* CURL_DO_LINEEND_CONV */
1120 !data->req.newurl) {
1121 failf(data, "transfer closed with %" FORMAT_OFF_T
1122 " bytes remaining to read",
1123 k->size - k->bytecount);
1124 return CURLE_PARTIAL_FILE;
1126 else if(!(data->set.opt_no_body) &&
1128 (conn->chunk.state != CHUNK_STOP)) {
1130 * In chunked mode, return an error if the connection is closed prior to
1131 * the empty (terminiating) chunk is read.
1133 * The condition above used to check for
1134 * conn->proto.http->chunk.datasize != 0 which is true after reading
1135 * *any* chunk, not just the empty chunk.
1138 failf(data, "transfer closed with outstanding read data remaining");
1139 return CURLE_PARTIAL_FILE;
1141 if(Curl_pgrsUpdate(conn))
1142 return CURLE_ABORTED_BY_CALLBACK;
1145 /* Now update the "done" boolean we return */
1146 *done = (bool)(0 == (k->keepon&(KEEP_RECV|KEEP_SEND|
1147 KEEP_RECV_PAUSE|KEEP_SEND_PAUSE)));
1153 * Curl_single_getsock() gets called by the multi interface code when the app
1154 * has requested to get the sockets for the current connection. This function
1155 * will then be called once for every connection that the multi interface
1156 * keeps track of. This function will only be called for connections that are
1157 * in the proper state to have this information available.
1159 int Curl_single_getsock(const struct connectdata *conn,
1160 curl_socket_t *sock, /* points to numsocks number
1164 const struct SessionHandle *data = conn->data;
1165 int bitmap = GETSOCK_BLANK;
1166 unsigned sockindex = 0;
1168 if(conn->handler->perform_getsock)
1169 return conn->handler->perform_getsock(conn, sock, numsocks);
1172 /* simple check but we might need two slots */
1173 return GETSOCK_BLANK;
1175 /* don't include HOLD and PAUSE connections */
1176 if((data->req.keepon & KEEP_RECVBITS) == KEEP_RECV) {
1178 DEBUGASSERT(conn->sockfd != CURL_SOCKET_BAD);
1180 bitmap |= GETSOCK_READSOCK(sockindex);
1181 sock[sockindex] = conn->sockfd;
1184 /* don't include HOLD and PAUSE connections */
1185 if((data->req.keepon & KEEP_SENDBITS) == KEEP_SEND) {
1187 if((conn->sockfd != conn->writesockfd) ||
1188 !(data->req.keepon & KEEP_RECV)) {
1189 /* only if they are not the same socket or we didn't have a readable
1190 one, we increase index */
1191 if(data->req.keepon & KEEP_RECV)
1192 sockindex++; /* increase index if we need two entries */
1194 DEBUGASSERT(conn->writesockfd != CURL_SOCKET_BAD);
1196 sock[sockindex] = conn->writesockfd;
1199 bitmap |= GETSOCK_WRITESOCK(sockindex);
1206 * Determine optimum sleep time based on configured rate, current rate,
1208 * Returns value in mili-seconds.
1210 * The basic idea is to adjust the desired rate up/down in this method
1211 * based on whether we are running too slow or too fast. Then, calculate
1212 * how many miliseconds to wait for the next packet to achieve this new
1215 long Curl_sleep_time(curl_off_t rate_bps, curl_off_t cur_rate_bps,
1218 curl_off_t min_sleep = 0;
1224 /* If running faster than about .1% of the desired speed, slow
1225 * us down a bit. Use shift instead of division as the 0.1%
1226 * cutoff is arbitrary anyway.
1228 if(cur_rate_bps > (rate_bps + (rate_bps >> 10))) {
1229 /* running too fast, decrease target rate by 1/64th of rate */
1230 rate_bps -= rate_bps >> 6;
1233 else if(cur_rate_bps < (rate_bps - (rate_bps >> 10))) {
1234 /* running too slow, increase target rate by 1/64th of rate */
1235 rate_bps += rate_bps >> 6;
1238 /* Determine number of miliseconds to wait until we do
1239 * the next packet at the adjusted rate. We should wait
1240 * longer when using larger packets, for instance.
1242 rv = ((curl_off_t)((pkt_size * 8) * 1000) / rate_bps);
1244 /* Catch rounding errors and always slow down at least 1ms if
1245 * we are running too fast.
1250 /* Bound value to fit in 'long' on 32-bit platform. That's
1251 * plenty long enough anyway!
1263 * This function is what performs the actual transfer. It is capable of doing
1264 * both ways simultaneously. The transfer must already have been setup by a
1265 * call to Curl_setup_transfer().
1267 * Note that headers are created in a preallocated buffer of a default size.
1268 * That buffer can be enlarged on demand, but it is never shrunken again.
1273 Transfer(struct connectdata *conn)
1276 struct SessionHandle *data = conn->data;
1277 struct SingleRequest *k = &data->req;
1284 if((conn->sockfd == CURL_SOCKET_BAD) &&
1285 (conn->writesockfd == CURL_SOCKET_BAD))
1286 /* nothing to read, nothing to write, we're already OK! */
1289 /* we want header and/or body, if neither then don't do this! */
1290 if(!k->getheader && data->set.opt_no_body)
1294 curl_socket_t fd_read = conn->sockfd;
1295 curl_socket_t fd_write = conn->writesockfd;
1296 int keepon = k->keepon;
1300 /* if waitfor is set, get the RECV and SEND bits from that but keep the
1302 keepon &= ~ (KEEP_RECV|KEEP_SEND);
1303 keepon |= conn->waitfor & (KEEP_RECV|KEEP_SEND);
1306 /* limit-rate logic: if speed exceeds threshold, then do not include fd in
1307 select set. The current speed is recalculated in each Curl_readwrite()
1309 if((keepon & KEEP_SEND) &&
1310 (!data->set.max_send_speed ||
1311 (data->progress.ulspeed < data->set.max_send_speed) )) {
1312 k->keepon &= ~KEEP_SEND_HOLD;
1315 if(data->set.upload && data->set.max_send_speed &&
1316 (data->progress.ulspeed > data->set.max_send_speed) ) {
1317 /* calculate upload rate-limitation timeout. */
1318 buffersize = (int)(data->set.buffer_size ?
1319 data->set.buffer_size : BUFSIZE);
1320 totmp = Curl_sleep_time(data->set.max_send_speed,
1321 data->progress.ulspeed, buffersize);
1322 if(totmp < timeout_ms)
1325 fd_write = CURL_SOCKET_BAD;
1326 if(keepon & KEEP_SEND)
1327 k->keepon |= KEEP_SEND_HOLD; /* hold it */
1330 if((keepon & KEEP_RECV) &&
1331 (!data->set.max_recv_speed ||
1332 (data->progress.dlspeed < data->set.max_recv_speed)) ) {
1333 k->keepon &= ~KEEP_RECV_HOLD;
1336 if((!data->set.upload) && data->set.max_recv_speed &&
1337 (data->progress.dlspeed > data->set.max_recv_speed)) {
1338 /* Calculate download rate-limitation timeout. */
1339 buffersize = (int)(data->set.buffer_size ?
1340 data->set.buffer_size : BUFSIZE);
1341 totmp = Curl_sleep_time(data->set.max_recv_speed,
1342 data->progress.dlspeed, buffersize);
1343 if(totmp < timeout_ms)
1346 fd_read = CURL_SOCKET_BAD;
1347 if(keepon & KEEP_RECV)
1348 k->keepon |= KEEP_RECV_HOLD; /* hold it */
1351 /* pause logic. Don't check descriptors for paused connections */
1352 if(k->keepon & KEEP_RECV_PAUSE)
1353 fd_read = CURL_SOCKET_BAD;
1354 if(k->keepon & KEEP_SEND_PAUSE)
1355 fd_write = CURL_SOCKET_BAD;
1357 /* The *_HOLD and *_PAUSE logic is necessary since even though there might
1358 be no traffic during the select interval, we still call
1359 Curl_readwrite() for the timeout case and if we limit transfer speed we
1360 must make sure that this function doesn't transfer anything while in
1363 The no timeout for the first round is for the protocols for which data
1364 has already been slurped off the socket and thus waiting for action
1365 won't work since it'll wait even though there is already data present
1368 ((fd_read != CURL_SOCKET_BAD) || (fd_write != CURL_SOCKET_BAD)))
1369 /* if this is the first lap and one of the file descriptors is fine
1370 to work with, skip the timeout */
1373 totmp = Curl_timeleft(data, &k->now, FALSE);
1375 return CURLE_OPERATION_TIMEDOUT;
1379 if(totmp < timeout_ms)
1383 switch (Curl_socket_ready(fd_read, fd_write, timeout_ms)) {
1384 case -1: /* select() error, stop reading */
1386 /* The EINTR is not serious, and it seems you might get this more
1387 often when using the lib in a multi-threaded environment! */
1388 if(SOCKERRNO == EINTR)
1391 return CURLE_RECV_ERROR; /* indicate a network problem */
1392 case 0: /* timeout */
1393 default: /* readable descriptors */
1395 result = Curl_readwrite(conn, &done);
1396 /* "done" signals to us if the transfer(s) are ready */
1402 first = FALSE; /* not the first lap anymore */
1408 static CURLcode loadhostpairs(struct SessionHandle *data)
1410 struct curl_slist *hostp;
1415 for(hostp = data->change.resolve; hostp; hostp = hostp->next ) {
1418 if(hostp->data[0] == '-') {
1419 /* TODO: mark an entry for removal */
1421 else if(3 == sscanf(hostp->data, "%255[^:]:%d:%255s", hostname, &port,
1423 struct Curl_dns_entry *dns;
1424 Curl_addrinfo *addr;
1426 addr = Curl_str2addr(address, port);
1428 infof(data, "Resolve %s found illegal!\n", hostp->data);
1431 infof(data, "Added %s:%d:%s to DNS cache\n",
1432 hostname, port, address);
1435 Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
1437 /* put this host in the cache */
1438 dns = Curl_cache_addr(data, addr, hostname, port);
1441 Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
1444 Curl_freeaddrinfo(addr);
1445 return CURLE_OUT_OF_MEMORY;
1449 data->change.resolve = NULL; /* dealt with now */
1456 * Curl_pretransfer() is called immediately before a transfer starts.
1458 CURLcode Curl_pretransfer(struct SessionHandle *data)
1461 if(!data->change.url) {
1462 /* we can't do anything without URL */
1463 failf(data, "No URL set!");
1464 return CURLE_URL_MALFORMAT;
1467 /* Init the SSL session ID cache here. We do it here since we want to do it
1468 after the *_setopt() calls (that could change the size of the cache) but
1469 before any transfer takes place. */
1470 res = Curl_ssl_initsessions(data, data->set.ssl.numsessions);
1474 data->set.followlocation=0; /* reset the location-follow counter */
1475 data->state.this_is_a_follow = FALSE; /* reset this */
1476 data->state.errorbuf = FALSE; /* no error has occurred */
1477 data->state.httpversion = 0; /* don't assume any particular server version */
1479 data->state.ssl_connect_retry = FALSE;
1481 data->state.authproblem = FALSE;
1482 data->state.authhost.want = data->set.httpauth;
1483 data->state.authproxy.want = data->set.proxyauth;
1484 Curl_safefree(data->info.wouldredirect);
1485 data->info.wouldredirect = NULL;
1487 /* If there is a list of cookie files to read, do it now! */
1488 if(data->change.cookielist)
1489 Curl_cookie_loadfiles(data);
1491 /* If there is a list of host pairs to deal with */
1492 if(data->change.resolve)
1493 res = loadhostpairs(data);
1496 /* Allow data->set.use_port to set which port to use. This needs to be
1497 * disabled for example when we follow Location: headers to URLs using
1498 * different ports! */
1499 data->state.allow_port = TRUE;
1501 #if defined(HAVE_SIGNAL) && defined(SIGPIPE) && !defined(HAVE_MSG_NOSIGNAL)
1502 /*************************************************************
1503 * Tell signal handler to ignore SIGPIPE
1504 *************************************************************/
1505 if(!data->set.no_signal)
1506 data->state.prev_signal = signal(SIGPIPE, SIG_IGN);
1509 Curl_initinfo(data); /* reset session-specific information "variables" */
1510 Curl_pgrsStartNow(data);
1512 if(data->set.timeout)
1513 Curl_expire(data, data->set.timeout);
1515 if(data->set.connecttimeout)
1516 Curl_expire(data, data->set.connecttimeout);
1523 * Curl_posttransfer() is called immediately after a transfer ends
1525 CURLcode Curl_posttransfer(struct SessionHandle *data)
1527 #if defined(HAVE_SIGNAL) && defined(SIGPIPE) && !defined(HAVE_MSG_NOSIGNAL)
1528 /* restore the signal handler for SIGPIPE before we get back */
1529 if(!data->set.no_signal)
1530 signal(SIGPIPE, data->state.prev_signal);
1532 (void)data; /* unused parameter */
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_resolver_wait_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_resolver_wait_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 &&
2063 !(conn->handler->protocol&(CURLPROTO_HTTP|CURLPROTO_RTSP)))
2066 if(/* workaround for broken TLS servers */ data->state.ssl_connect_retry ||
2067 ((data->req.bytecount +
2068 data->req.headerbytecount == 0) &&
2070 !data->set.opt_no_body &&
2071 data->set.rtspreq != RTSPREQ_RECEIVE)) {
2072 /* We got no data, we attempted to re-use a connection and yet we want a
2073 "body". This might happen if the connection was left alive when we were
2074 done using it before, but that was closed when we wanted to read from
2075 it again. Bad luck. Retry the same request on a fresh connect! */
2076 infof(conn->data, "Connection died, retrying a fresh connect\n");
2077 *url = strdup(conn->data->change.url);
2079 return CURLE_OUT_OF_MEMORY;
2081 conn->bits.close = TRUE; /* close this connection */
2082 conn->bits.retry = TRUE; /* mark this as a connection we're about
2083 to retry. Marking it this way should
2084 prevent i.e HTTP transfers to return
2085 error just because nothing has been
2088 if(data->state.proto.http->writebytecount)
2089 return Curl_readrewind(conn);
2094 static CURLcode Curl_do_perform(struct SessionHandle *data)
2098 struct connectdata *conn=NULL;
2099 char *newurl = NULL; /* possibly a new URL to follow to! */
2100 followtype follow = FOLLOW_NONE;
2102 data->state.used_interface = Curl_if_easy;
2104 res = Curl_pretransfer(data);
2109 * It is important that there is NO 'return' from this function at any other
2110 * place than falling down to the end of the function! This is because we
2111 * have cleanup stuff that must be done before we get back, and that is only
2112 * performed after this do-while loop.
2116 res = connect_host(data, &conn); /* primary connection */
2118 if(res == CURLE_OK) {
2120 if(data->set.connect_only) {
2121 /* keep connection open for application to use the socket */
2122 conn->bits.close = FALSE;
2123 res = Curl_done(&conn, CURLE_OK, FALSE);
2126 res = Curl_do(&conn, &do_done);
2128 if(res == CURLE_OK) {
2129 if(conn->data->set.wildcardmatch) {
2130 if(conn->data->wildcard.state == CURLWC_DONE ||
2131 conn->data->wildcard.state == CURLWC_SKIP) {
2132 /* keep connection open for application to use the socket */
2133 conn->bits.close = FALSE;
2134 res = Curl_done(&conn, CURLE_OK, FALSE);
2138 res = Transfer(conn); /* now fetch that URL please */
2139 if((res == CURLE_OK) || (res == CURLE_RECV_ERROR)) {
2141 CURLcode rc = Curl_retry_request(conn, &newurl);
2145 retry = (newurl?TRUE:FALSE);
2148 /* we know (newurl != NULL) at this point */
2150 follow = FOLLOW_RETRY;
2152 else if(res == CURLE_OK) {
2154 * We must duplicate the new URL here as the connection data may
2155 * be free()ed in the Curl_done() function. We prefer the newurl
2156 * one since that's used for redirects or just further requests
2157 * for retries or multi-stage HTTP auth methods etc.
2159 if(data->req.newurl) {
2160 follow = FOLLOW_REDIR;
2161 newurl = strdup(data->req.newurl);
2163 res = CURLE_OUT_OF_MEMORY;
2165 else if(data->req.location) {
2166 follow = FOLLOW_FAKE;
2167 newurl = strdup(data->req.location);
2169 res = CURLE_OUT_OF_MEMORY;
2173 /* in the above cases where 'newurl' gets assigned, we have a fresh
2174 * allocated memory pointed to */
2176 if(res != CURLE_OK) {
2177 /* The transfer phase returned error, we mark the connection to get
2178 * closed to prevent being re-used. This is because we can't
2179 * possibly know if the connection is in a good shape or not now. */
2180 conn->bits.close = TRUE;
2182 if(CURL_SOCKET_BAD != conn->sock[SECONDARYSOCKET]) {
2183 /* if we failed anywhere, we must clean up the secondary socket if
2185 Curl_closesocket(conn, conn->sock[SECONDARYSOCKET]);
2186 conn->sock[SECONDARYSOCKET] = CURL_SOCKET_BAD;
2190 /* Always run Curl_done(), even if some of the previous calls
2191 failed, but return the previous (original) error code */
2192 res2 = Curl_done(&conn, res, FALSE);
2198 /* Curl_do() failed, clean up left-overs in the done-call, but note
2199 that at some cases the conn pointer is NULL when Curl_do() failed
2200 and the connection cache is very small so only call Curl_done() if
2201 conn is still "alive". */
2202 /* ignore return code since we already have an error to return */
2203 (void)Curl_done(&conn, res, FALSE);
2206 * Important: 'conn' cannot be used here, since it may have been closed
2207 * in 'Curl_done' or other functions.
2210 if((res == CURLE_OK) && follow) {
2211 res = Curl_follow(data, newurl, follow);
2212 if(CURLE_OK == res) {
2213 /* if things went fine, Curl_follow() freed or otherwise took
2214 responsibility for the newurl pointer */
2216 if(follow >= FOLLOW_RETRY) {
2217 follow = FOLLOW_NONE;
2220 /* else we break out of the loop below */
2224 break; /* it only reaches here when this shouldn't loop */
2226 } /* loop if Location: */
2231 if(res && !data->state.errorbuf) {
2233 * As an extra precaution: if no error string has been set and there was
2234 * an error, use the strerror() string or if things are so bad that not
2235 * even that is good, set a bad string that mentions the error code.
2237 const char *str = curl_easy_strerror(res);
2239 failf(data, "unspecified error %d", (int)res);
2241 failf(data, "%s", str);
2244 /* run post-transfer unconditionally, but don't clobber the return code if
2245 we already have an error code recorder */
2246 res2 = Curl_posttransfer(data);
2254 * Curl_perform() is the internal high-level function that gets called by the
2255 * external curl_easy_perform() function. It inits, performs and cleans up a
2256 * single file transfer.
2258 CURLcode Curl_perform(struct SessionHandle *data)
2261 if(!data->set.wildcardmatch)
2262 return Curl_do_perform(data);
2264 /* init main wildcard structures */
2265 res = Curl_wildcard_init(&data->wildcard);
2269 res = Curl_do_perform(data);
2271 Curl_wildcard_dtor(&data->wildcard);
2276 while(!res && data->wildcard.state != CURLWC_DONE)
2277 res = Curl_do_perform(data);
2279 Curl_wildcard_dtor(&data->wildcard);
2281 /* wildcard download finished or failed */
2282 data->wildcard.state = CURLWC_INIT;
2287 * Curl_setup_transfer() is called to setup some basic properties for the
2288 * upcoming transfer.
2291 Curl_setup_transfer(
2292 struct connectdata *conn, /* connection data */
2293 int sockindex, /* socket index to read from or -1 */
2294 curl_off_t size, /* -1 if unknown at this point */
2295 bool getheader, /* TRUE if header parsing is wanted */
2296 curl_off_t *bytecountp, /* return number of bytes read or NULL */
2297 int writesockindex, /* socket index to write to, it may very well be
2298 the same we read from. -1 disables */
2299 curl_off_t *writecountp /* return number of bytes written or NULL */
2302 struct SessionHandle *data;
2303 struct SingleRequest *k;
2305 DEBUGASSERT(conn != NULL);
2310 DEBUGASSERT((sockindex <= 1) && (sockindex >= -1));
2312 /* now copy all input parameters */
2313 conn->sockfd = sockindex == -1 ?
2314 CURL_SOCKET_BAD : conn->sock[sockindex];
2315 conn->writesockfd = writesockindex == -1 ?
2316 CURL_SOCKET_BAD:conn->sock[writesockindex];
2317 k->getheader = getheader;
2320 k->bytecountp = bytecountp;
2321 k->writebytecountp = writecountp;
2323 /* The code sequence below is placed in this function just because all
2324 necessary input is not always known in do_complete() as this function may
2325 be called after that */
2330 Curl_pgrsSetDownloadSize(data, size);
2332 /* we want header and/or body, if neither then don't do this! */
2333 if(k->getheader || !data->set.opt_no_body) {
2335 if(conn->sockfd != CURL_SOCKET_BAD)
2336 k->keepon |= KEEP_RECV;
2338 if(conn->writesockfd != CURL_SOCKET_BAD) {
2341 Even if we require a 100-return code before uploading data, we might
2342 need to write data before that since the REQUEST may not have been
2343 finished sent off just yet.
2345 Thus, we must check if the request has been sent before we set the
2346 state info where we wait for the 100-return code
2348 if((data->state.expect100header) &&
2349 (data->state.proto.http->sending == HTTPSEND_BODY)) {
2350 /* wait with write until we either got 100-continue or a timeout */
2351 k->exp100 = EXP100_AWAITING_CONTINUE;
2352 k->start100 = k->start;
2354 /* set a timeout for the multi interface */
2355 Curl_expire(data, CURL_TIMEOUT_EXPECT_100);
2358 if(data->state.expect100header)
2359 /* when we've sent off the rest of the headers, we must await a
2360 100-continue but first finish sending the request */
2361 k->exp100 = EXP100_SENDING_REQUEST;
2363 /* enable the write bit when we're not waiting for continue */
2364 k->keepon |= KEEP_SEND;
2366 } /* if(conn->writesockfd != CURL_SOCKET_BAD) */
2367 } /* if(k->getheader || !data->set.opt_no_body) */