1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2010, 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));
360 * Go ahead and do a read if we have a readable socket or if
361 * the stream was rewound (in which case we have data in a
364 static CURLcode readwrite_data(struct SessionHandle *data,
365 struct connectdata *conn,
366 struct SingleRequest *k,
367 int *didwhat, bool *done)
369 CURLcode result = CURLE_OK;
370 ssize_t nread; /* number of bytes read */
371 size_t excess = 0; /* excess bytes read */
372 bool is_empty_data = FALSE;
373 #ifndef CURL_DISABLE_RTSP
374 bool readmore = FALSE; /* used by RTP to signal for more data */
379 /* This is where we loop until we have read everything there is to
380 read or we get a CURLE_AGAIN */
382 size_t buffersize = data->set.buffer_size?
383 data->set.buffer_size : BUFSIZE;
384 size_t bytestoread = buffersize;
386 if(k->size != -1 && !k->header) {
387 /* make sure we don't read "too much" if we can help it since we
388 might be pipelining and then someone else might want to read what
390 curl_off_t totalleft = k->size - k->bytecount;
391 if(totalleft < (curl_off_t)bytestoread)
392 bytestoread = (size_t)totalleft;
396 /* receive data from the network! */
397 result = Curl_read(conn, conn->sockfd, k->buf, bytestoread, &nread);
399 /* read would've blocked */
400 if(CURLE_AGAIN == result)
401 break; /* get out of loop */
407 /* read nothing but since we wanted nothing we consider this an OK
408 situation to proceed from */
412 if((k->bytecount == 0) && (k->writebytecount == 0)) {
413 Curl_pgrsTime(data, TIMER_STARTTRANSFER);
414 if(k->exp100 > EXP100_SEND_DATA)
415 /* set time stamp to compare with when waiting for the 100 */
416 k->start100 = Curl_tvnow();
419 *didwhat |= KEEP_RECV;
420 /* indicates data of zero size, i.e. empty file */
421 is_empty_data = (bool)((nread == 0) && (k->bodywrites == 0));
423 /* NUL terminate, allowing string ops to be used */
424 if(0 < nread || is_empty_data) {
427 else if(0 >= nread) {
428 /* if we receive 0 or less here, the server closed the connection
429 and we bail out from this! */
430 DEBUGF(infof(data, "nread <= 0, server closed connection, bailing\n"));
431 k->keepon &= ~KEEP_RECV;
435 /* Default buffer to use when we write the buffer, it may be changed
436 in the flow below before the actual storing is done. */
439 #ifndef CURL_DISABLE_RTSP
440 /* Check for RTP at the beginning of the data */
441 if(conn->protocol & PROT_RTSP) {
442 result = Curl_rtsp_rtp_readwrite(data, conn, &nread, &readmore);
450 #ifndef CURL_DISABLE_HTTP
451 /* Since this is a two-state thing, we check if we are parsing
452 headers at the moment or not. */
454 /* we are in parse-the-header-mode */
455 bool stop_reading = FALSE;
456 result = Curl_http_readwrite_headers(data, conn, &nread, &stop_reading);
460 #ifndef CURL_DISABLE_RTSP
461 /* Check for RTP after the headers if there is no Content */
462 if(k->maxdownload <= 0 && nread > 0 && (conn->protocol & PROT_RTSP)) {
463 result = Curl_rtsp_rtp_readwrite(data, conn, &nread, &readmore);
472 /* We've stopped dealing with input, get out of the do-while loop */
475 #endif /* CURL_DISABLE_HTTP */
478 /* This is not an 'else if' since it may be a rest from the header
479 parsing, where the beginning of the buffer is headers and the end
481 if(k->str && !k->header && (nread > 0 || is_empty_data)) {
484 #ifndef CURL_DISABLE_HTTP
485 if(0 == k->bodywrites && !is_empty_data) {
486 /* These checks are only made the first time we are about to
487 write a piece of the body */
488 if(conn->protocol&(PROT_HTTP|PROT_RTSP)) {
489 /* HTTP-only checks */
491 if(data->req.newurl) {
492 if(conn->bits.close) {
493 /* Abort after the headers if "follow Location" is set
494 and we're set to close anyway. */
495 k->keepon &= ~KEEP_RECV;
499 /* We have a new url to load, but since we want to be able
500 to re-use this connection properly, we read the full
501 response in "ignore more" */
502 k->ignorebody = TRUE;
503 infof(data, "Ignoring the response-body\n");
505 if(data->state.resume_from && !k->content_range &&
506 (data->set.httpreq==HTTPREQ_GET) &&
508 /* we wanted to resume a download, although the server doesn't
509 * seem to support this and we did this with a GET (if it
510 * wasn't a GET we did a POST or PUT resume) */
511 failf(data, "HTTP server doesn't seem to support "
512 "byte ranges. Cannot resume.");
513 return CURLE_RANGE_ERROR;
516 if(data->set.timecondition && !data->state.range) {
517 /* A time condition has been set AND no ranges have been
518 requested. This seems to be what chapter 13.3.4 of
519 RFC 2616 defines to be the correct action for a
521 if((k->timeofdoc > 0) && (data->set.timevalue > 0)) {
522 switch(data->set.timecondition) {
523 case CURL_TIMECOND_IFMODSINCE:
525 if(k->timeofdoc < data->set.timevalue) {
527 "The requested document is not new enough\n");
529 data->info.timecond = TRUE;
533 case CURL_TIMECOND_IFUNMODSINCE:
534 if(k->timeofdoc > data->set.timevalue) {
536 "The requested document is not old enough\n");
538 data->info.timecond = TRUE;
543 } /* two valid time strings */
544 } /* we have a time condition */
547 } /* this is the first time we write a body part */
548 #endif /* CURL_DISABLE_HTTP */
551 /* pass data to the debug function before it gets "dechunked" */
552 if(data->set.verbose) {
554 Curl_debug(data, CURLINFO_DATA_IN, data->state.headerbuff,
555 (size_t)k->hbuflen, conn);
556 if(k->badheader == HEADER_PARTHEADER)
557 Curl_debug(data, CURLINFO_DATA_IN,
558 k->str, (size_t)nread, conn);
561 Curl_debug(data, CURLINFO_DATA_IN,
562 k->str, (size_t)nread, conn);
565 #ifndef CURL_DISABLE_HTTP
568 * Here comes a chunked transfer flying and we need to decode this
569 * properly. While the name says read, this function both reads
570 * and writes away the data. The returned 'nread' holds the number
571 * of actual data it wrote to the client.
575 Curl_httpchunk_read(conn, k->str, nread, &nread);
577 if(CHUNKE_OK < res) {
578 if(CHUNKE_WRITE_ERROR == res) {
579 failf(data, "Failed writing data");
580 return CURLE_WRITE_ERROR;
582 failf(data, "Received problem %d in the chunky parser", (int)res);
583 return CURLE_RECV_ERROR;
585 else if(CHUNKE_STOP == res) {
587 /* we're done reading chunks! */
588 k->keepon &= ~KEEP_RECV; /* read no more */
590 /* There are now possibly N number of bytes at the end of the
591 str buffer that weren't written to the client.
593 We DO care about this data if we are pipelining.
594 Push it back to be read on the next pass. */
596 dataleft = conn->chunk.dataleft;
598 infof(conn->data, "Leftovers after chunking: %zu bytes", dataleft);
599 if(conn->data->multi && Curl_multi_canPipeline(conn->data->multi)) {
600 /* only attempt the rewind if we truly are pipelining */
601 infof(conn->data, "Rewinding %zu bytes\n",dataleft);
602 read_rewind(conn, dataleft);
606 /* If it returned OK, we just keep going */
608 #endif /* CURL_DISABLE_HTTP */
610 /* Account for body content stored in the header buffer */
611 if(k->badheader && !k->ignorebody) {
612 DEBUGF(infof(data, "Increasing bytecount by %zu from hbuflen\n",
614 k->bytecount += k->hbuflen;
617 if((-1 != k->maxdownload) &&
618 (k->bytecount + nread >= k->maxdownload)) {
620 excess = (size_t)(k->bytecount + nread - k->maxdownload);
621 if(excess > 0 && !k->ignorebody) {
622 if(conn->data->multi && Curl_multi_canPipeline(conn->data->multi)) {
623 /* The 'excess' amount below can't be more than BUFSIZE which
624 always will fit in a size_t */
626 "Rewinding stream by : %zu"
627 " bytes on url %s (size = %" FORMAT_OFF_T
628 ", maxdownload = %" FORMAT_OFF_T
629 ", bytecount = %" FORMAT_OFF_T ", nread = %zd)\n",
630 excess, data->state.path,
631 k->size, k->maxdownload, k->bytecount, nread);
632 read_rewind(conn, excess);
636 "Excess found in a non pipelined read:"
638 ", size = %" FORMAT_OFF_T
639 ", maxdownload = %" FORMAT_OFF_T
640 ", bytecount = %" FORMAT_OFF_T "\n",
641 excess, k->size, k->maxdownload, k->bytecount);
645 nread = (ssize_t) (k->maxdownload - k->bytecount);
646 if(nread < 0 ) /* this should be unusual */
649 k->keepon &= ~KEEP_RECV; /* we're done reading */
652 k->bytecount += nread;
654 Curl_pgrsSetDownloadCounter(data, k->bytecount);
656 if(!k->chunk && (nread || k->badheader || is_empty_data)) {
657 /* If this is chunky transfer, it was already written */
659 if(k->badheader && !k->ignorebody) {
660 /* we parsed a piece of data wrongly assuming it was a header
661 and now we output it as body instead */
663 /* Don't let excess data pollute body writes */
664 if(k->maxdownload == -1 || (curl_off_t)k->hbuflen <= k->maxdownload)
665 result = Curl_client_write(conn, CLIENTWRITE_BODY,
666 data->state.headerbuff,
669 result = Curl_client_write(conn, CLIENTWRITE_BODY,
670 data->state.headerbuff,
671 (size_t)k->maxdownload);
676 if(k->badheader < HEADER_ALLBAD) {
677 /* This switch handles various content encodings. If there's an
678 error here, be sure to check over the almost identical code
680 Make sure that ALL_CONTENT_ENCODINGS contains all the
681 encodings handled here. */
683 switch (conn->data->set.http_ce_skip ?
684 IDENTITY : k->content_encoding) {
687 /* This is the default when the server sends no
688 Content-Encoding header. See Curl_readwrite_init; the
689 memset() call initializes k->content_encoding to zero. */
692 #ifndef CURL_DISABLE_POP3
693 if(conn->protocol&PROT_POP3)
694 result = Curl_pop3_write(conn, k->str, nread);
696 #endif /* CURL_DISABLE_POP3 */
698 result = Curl_client_write(conn, CLIENTWRITE_BODY, k->str,
705 /* Assume CLIENTWRITE_BODY; headers are not encoded. */
707 result = Curl_unencode_deflate_write(conn, k, nread);
711 /* Assume CLIENTWRITE_BODY; headers are not encoded. */
713 result = Curl_unencode_gzip_write(conn, k, nread);
718 failf (data, "Unrecognized content encoding type. "
719 "libcurl understands `identity', `deflate' and `gzip' "
720 "content encodings.");
721 result = CURLE_BAD_CONTENT_ENCODING;
726 k->badheader = HEADER_NORMAL; /* taken care of now */
732 } /* if(! header and data to read ) */
734 #ifndef CURL_DISABLE_RTSP
735 if(excess > 0 && !conn->bits.stream_was_rewound &&
736 (conn->protocol & PROT_RTSP)) {
737 /* Check for RTP after the content if there is unrewound excess */
739 /* Parse the excess data */
741 nread = (ssize_t)excess;
743 result = Curl_rtsp_rtp_readwrite(data, conn, &nread, &readmore);
748 k->keepon |= KEEP_RECV; /* we're not done reading */
754 /* if we received nothing, the server closed the connection and we
756 k->keepon &= ~KEEP_RECV;
759 } while(data_pending(conn));
761 if(((k->keepon & (KEEP_RECV|KEEP_SEND)) == KEEP_SEND) &&
763 /* When we've read the entire thing and the close bit is set, the server
764 may now close the connection. If there's now any kind of sending going
765 on from our side, we need to stop that immediately. */
766 infof(data, "we are done reading and this is set to close, stop send\n");
767 k->keepon &= ~KEEP_SEND; /* no writing anymore either */
774 * Send data to upload to the server, when the socket is writable.
776 static CURLcode readwrite_upload(struct SessionHandle *data,
777 struct connectdata *conn,
778 struct SingleRequest *k,
782 ssize_t bytes_written;
784 ssize_t nread; /* number of bytes read */
785 bool sending_http_headers = FALSE;
787 if((k->bytecount == 0) && (k->writebytecount == 0))
788 Curl_pgrsTime(data, TIMER_STARTTRANSFER);
790 *didwhat |= KEEP_SEND;
793 * We loop here to do the READ and SEND loop until we run out of
794 * data to send or until we get EWOULDBLOCK back
798 /* only read more data if there's no upload data already
799 present in the upload buffer */
800 if(0 == data->req.upload_present) {
801 /* init the "upload from here" pointer */
802 data->req.upload_fromhere = k->uploadbuf;
804 if(!k->upload_done) {
805 /* HTTP pollution, this should be written nicer to become more
806 protocol agnostic. */
809 if((k->exp100 == EXP100_SENDING_REQUEST) &&
810 (data->state.proto.http->sending == HTTPSEND_BODY)) {
811 /* If this call is to send body data, we must take some action:
812 We have sent off the full HTTP 1.1 request, and we shall now
813 go into the Expect: 100 state and await such a header */
814 k->exp100 = EXP100_AWAITING_CONTINUE; /* wait for the header */
815 k->keepon &= ~KEEP_SEND; /* disable writing */
816 k->start100 = Curl_tvnow(); /* timeout count starts now */
817 *didwhat &= ~KEEP_SEND; /* we didn't write anything actually */
819 /* set a timeout for the multi interface */
820 Curl_expire(data, CURL_TIMEOUT_EXPECT_100);
824 if(conn->protocol&(PROT_HTTP|PROT_RTSP)) {
825 if(data->state.proto.http->sending == HTTPSEND_REQUEST)
826 /* We're sending the HTTP request headers, not the data.
827 Remember that so we don't change the line endings. */
828 sending_http_headers = TRUE;
830 sending_http_headers = FALSE;
833 result = Curl_fillreadbuffer(conn, BUFSIZE, &fillcount);
837 nread = (ssize_t)fillcount;
840 nread = 0; /* we're done uploading/reading */
842 if(!nread && (k->keepon & KEEP_SEND_PAUSE)) {
843 /* this is a paused transfer */
848 k->keepon &= ~KEEP_SEND; /* we're done writing */
850 if(conn->bits.rewindaftersend) {
851 result = Curl_readrewind(conn);
858 /* store number of bytes available for upload */
859 data->req.upload_present = nread;
861 #ifndef CURL_DISABLE_SMTP
862 if(conn->protocol & PROT_SMTP) {
863 result = Curl_smtp_escape_eob(conn, nread);
868 #endif /* CURL_DISABLE_SMTP */
870 /* convert LF to CRLF if so asked */
871 if((!sending_http_headers) &&
872 #ifdef CURL_DO_LINEEND_CONV
873 /* always convert if we're FTPing in ASCII mode */
874 ((data->set.crlf) || (data->set.prefer_ascii))) {
878 if(data->state.scratch == NULL)
879 data->state.scratch = malloc(2*BUFSIZE);
880 if(data->state.scratch == NULL) {
881 failf (data, "Failed to alloc scratch buffer!");
882 return CURLE_OUT_OF_MEMORY;
885 * ASCII/EBCDIC Note: This is presumably a text (not binary)
886 * transfer so the data should already be in ASCII.
887 * That means the hex values for ASCII CR (0x0d) & LF (0x0a)
888 * must be used instead of the escape sequences \r & \n.
890 for(i = 0, si = 0; i < nread; i++, si++) {
891 if(data->req.upload_fromhere[i] == 0x0a) {
892 data->state.scratch[si++] = 0x0d;
893 data->state.scratch[si] = 0x0a;
894 if(!data->set.crlf) {
895 /* we're here only because FTP is in ASCII mode...
896 bump infilesize for the LF we just added */
897 data->set.infilesize++;
901 data->state.scratch[si] = data->req.upload_fromhere[i];
904 /* only perform the special operation if we really did replace
908 /* upload from the new (replaced) buffer instead */
909 data->req.upload_fromhere = data->state.scratch;
911 /* set the new amount too */
912 data->req.upload_present = nread;
915 } /* if 0 == data->req.upload_present */
917 /* We have a partial buffer left from a previous "round". Use
918 that instead of reading more data */
921 /* write to socket (send away data) */
922 result = Curl_write(conn,
923 conn->writesockfd, /* socket to send to */
924 data->req.upload_fromhere, /* buffer pointer */
925 data->req.upload_present, /* buffer size */
926 &bytes_written); /* actually sent */
931 if(data->set.verbose)
932 /* show the data before we change the pointer upload_fromhere */
933 Curl_debug(data, CURLINFO_DATA_OUT, data->req.upload_fromhere,
934 (size_t)bytes_written, conn);
936 if(data->req.upload_present != bytes_written) {
937 /* we only wrote a part of the buffer (if anything), deal with it! */
939 /* store the amount of bytes left in the buffer to write */
940 data->req.upload_present -= bytes_written;
942 /* advance the pointer where to find the buffer when the next send
944 data->req.upload_fromhere += bytes_written;
947 /* we've uploaded that buffer now */
948 data->req.upload_fromhere = k->uploadbuf;
949 data->req.upload_present = 0; /* no more bytes left */
952 /* switch off writing, we're done! */
953 k->keepon &= ~KEEP_SEND; /* we're done writing */
957 k->writebytecount += bytes_written;
958 Curl_pgrsSetUploadCounter(data, k->writebytecount);
960 } while(0); /* just to break out from! */
966 * Curl_readwrite() is the low-level function to be called when data is to
967 * be read and written to/from the connection.
969 CURLcode Curl_readwrite(struct connectdata *conn,
972 struct SessionHandle *data = conn->data;
973 struct SingleRequest *k = &data->req;
977 curl_socket_t fd_read;
978 curl_socket_t fd_write;
979 int select_res = conn->cselect_bits;
981 conn->cselect_bits = 0;
983 /* only use the proper socket if the *_HOLD bit is not set simultaneously as
984 then we are in rate limiting state in that transfer direction */
986 if((k->keepon & KEEP_RECVBITS) == KEEP_RECV)
987 fd_read = conn->sockfd;
989 fd_read = CURL_SOCKET_BAD;
991 if((k->keepon & KEEP_SENDBITS) == KEEP_SEND)
992 fd_write = conn->writesockfd;
994 fd_write = CURL_SOCKET_BAD;
996 if(!select_res) /* Call for select()/poll() only, if read/write/error
997 status is not known. */
998 select_res = Curl_socket_ready(fd_read, fd_write, 0);
1000 if(select_res == CURL_CSELECT_ERR) {
1001 failf(data, "select/poll returned error");
1002 return CURLE_SEND_ERROR;
1005 /* We go ahead and do a read if we have a readable socket or if
1006 the stream was rewound (in which case we have data in a
1008 if((k->keepon & KEEP_RECV) &&
1009 ((select_res & CURL_CSELECT_IN) || conn->bits.stream_was_rewound)) {
1011 result = readwrite_data(data, conn, k, &didwhat, done);
1016 /* If we still have writing to do, we check if we have a writable socket. */
1017 if((k->keepon & KEEP_SEND) && (select_res & CURL_CSELECT_OUT)) {
1020 result = readwrite_upload(data, conn, k, &didwhat);
1025 k->now = Curl_tvnow();
1027 /* Update read/write counters */
1029 *k->bytecountp = k->bytecount; /* read count */
1030 if(k->writebytecountp)
1031 *k->writebytecountp = k->writebytecount; /* write count */
1034 /* no read no write, this is a timeout? */
1035 if(k->exp100 == EXP100_AWAITING_CONTINUE) {
1036 /* This should allow some time for the header to arrive, but only a
1037 very short time as otherwise it'll be too much wasted time too
1040 /* Quoting RFC2616, section "8.2.3 Use of the 100 (Continue) Status":
1042 Therefore, when a client sends this header field to an origin server
1043 (possibly via a proxy) from which it has never seen a 100 (Continue)
1044 status, the client SHOULD NOT wait for an indefinite period before
1045 sending the request body.
1049 long ms = Curl_tvdiff(k->now, k->start100);
1050 if(ms > CURL_TIMEOUT_EXPECT_100) {
1051 /* we've waited long enough, continue anyway */
1052 k->exp100 = EXP100_SEND_DATA;
1053 k->keepon |= KEEP_SEND;
1054 infof(data, "Done waiting for 100-continue\n");
1059 if(Curl_pgrsUpdate(conn))
1060 result = CURLE_ABORTED_BY_CALLBACK;
1062 result = Curl_speedcheck(data, k->now);
1067 if(0 > Curl_timeleft(conn, &k->now, FALSE)) {
1069 failf(data, "Operation timed out after %ld milliseconds with %"
1070 FORMAT_OFF_T " out of %" FORMAT_OFF_T " bytes received",
1071 Curl_tvdiff(k->now, data->progress.t_startsingle), k->bytecount,
1075 failf(data, "Operation timed out after %ld milliseconds with %"
1076 FORMAT_OFF_T " bytes received",
1077 Curl_tvdiff(k->now, data->progress.t_startsingle), k->bytecount);
1079 return CURLE_OPERATION_TIMEDOUT;
1084 * The transfer has been performed. Just make some general checks before
1088 if(!(data->set.opt_no_body) && (k->size != -1) &&
1089 (k->bytecount != k->size) &&
1090 #ifdef CURL_DO_LINEEND_CONV
1091 /* Most FTP servers don't adjust their file SIZE response for CRLFs,
1092 so we'll check to see if the discrepancy can be explained
1093 by the number of CRLFs we've changed to LFs.
1095 (k->bytecount != (k->size + data->state.crlf_conversions)) &&
1096 #endif /* CURL_DO_LINEEND_CONV */
1097 !data->req.newurl) {
1098 failf(data, "transfer closed with %" FORMAT_OFF_T
1099 " bytes remaining to read",
1100 k->size - k->bytecount);
1101 return CURLE_PARTIAL_FILE;
1103 else if(!(data->set.opt_no_body) &&
1105 (conn->chunk.state != CHUNK_STOP)) {
1107 * In chunked mode, return an error if the connection is closed prior to
1108 * the empty (terminiating) chunk is read.
1110 * The condition above used to check for
1111 * conn->proto.http->chunk.datasize != 0 which is true after reading
1112 * *any* chunk, not just the empty chunk.
1115 failf(data, "transfer closed with outstanding read data remaining");
1116 return CURLE_PARTIAL_FILE;
1118 if(Curl_pgrsUpdate(conn))
1119 return CURLE_ABORTED_BY_CALLBACK;
1122 /* Now update the "done" boolean we return */
1123 *done = (bool)(0 == (k->keepon&(KEEP_RECV|KEEP_SEND|
1124 KEEP_RECV_PAUSE|KEEP_SEND_PAUSE)));
1130 * Curl_single_getsock() gets called by the multi interface code when the app
1131 * has requested to get the sockets for the current connection. This function
1132 * will then be called once for every connection that the multi interface
1133 * keeps track of. This function will only be called for connections that are
1134 * in the proper state to have this information available.
1136 int Curl_single_getsock(const struct connectdata *conn,
1137 curl_socket_t *sock, /* points to numsocks number
1141 const struct SessionHandle *data = conn->data;
1142 int bitmap = GETSOCK_BLANK;
1143 unsigned sockindex = 0;
1145 if(conn->handler->perform_getsock)
1146 return conn->handler->perform_getsock(conn, sock, numsocks);
1149 /* simple check but we might need two slots */
1150 return GETSOCK_BLANK;
1152 /* don't include HOLD and PAUSE connections */
1153 if((data->req.keepon & KEEP_RECVBITS) == KEEP_RECV) {
1155 DEBUGASSERT(conn->sockfd != CURL_SOCKET_BAD);
1157 bitmap |= GETSOCK_READSOCK(sockindex);
1158 sock[sockindex] = conn->sockfd;
1161 /* don't include HOLD and PAUSE connections */
1162 if((data->req.keepon & KEEP_SENDBITS) == KEEP_SEND) {
1164 if((conn->sockfd != conn->writesockfd) ||
1165 !(data->req.keepon & KEEP_RECV)) {
1166 /* only if they are not the same socket or we didn't have a readable
1167 one, we increase index */
1168 if(data->req.keepon & KEEP_RECV)
1169 sockindex++; /* increase index if we need two entries */
1171 DEBUGASSERT(conn->writesockfd != CURL_SOCKET_BAD);
1173 sock[sockindex] = conn->writesockfd;
1176 bitmap |= GETSOCK_WRITESOCK(sockindex);
1183 * Determine optimum sleep time based on configured rate, current rate,
1185 * Returns value in mili-seconds.
1187 * The basic idea is to adjust the desired rate up/down in this method
1188 * based on whether we are running too slow or too fast. Then, calculate
1189 * how many miliseconds to wait for the next packet to achieve this new
1192 long Curl_sleep_time(curl_off_t rate_bps, curl_off_t cur_rate_bps,
1195 curl_off_t min_sleep = 0;
1201 /* If running faster than about .1% of the desired speed, slow
1202 * us down a bit. Use shift instead of division as the 0.1%
1203 * cutoff is arbitrary anyway.
1205 if (cur_rate_bps > (rate_bps + (rate_bps >> 10))) {
1206 /* running too fast, decrease target rate by 1/64th of rate */
1207 rate_bps -= rate_bps >> 6;
1210 else if (cur_rate_bps < (rate_bps - (rate_bps >> 10))) {
1211 /* running too slow, increase target rate by 1/64th of rate */
1212 rate_bps += rate_bps >> 6;
1215 /* Determine number of miliseconds to wait until we do
1216 * the next packet at the adjusted rate. We should wait
1217 * longer when using larger packets, for instance.
1219 rv = ((curl_off_t)((pkt_size * 8) * 1000) / rate_bps);
1221 /* Catch rounding errors and always slow down at least 1ms if
1222 * we are running too fast.
1227 /* Bound value to fit in 'long' on 32-bit platform. That's
1228 * plenty long enough anyway!
1240 * This function is what performs the actual transfer. It is capable of doing
1241 * both ways simultaneously. The transfer must already have been setup by a
1242 * call to Curl_setup_transfer().
1244 * Note that headers are created in a preallocated buffer of a default size.
1245 * That buffer can be enlarged on demand, but it is never shrunken again.
1250 Transfer(struct connectdata *conn)
1253 struct SessionHandle *data = conn->data;
1254 struct SingleRequest *k = &data->req;
1261 if((conn->sockfd == CURL_SOCKET_BAD) &&
1262 (conn->writesockfd == CURL_SOCKET_BAD))
1263 /* nothing to read, nothing to write, we're already OK! */
1266 /* we want header and/or body, if neither then don't do this! */
1267 if(!k->getheader && data->set.opt_no_body)
1271 curl_socket_t fd_read = conn->sockfd;
1272 curl_socket_t fd_write = conn->writesockfd;
1273 int keepon = k->keepon;
1277 /* if waitfor is set, get the RECV and SEND bits from that but keep the
1279 keepon &= ~ (KEEP_RECV|KEEP_SEND);
1280 keepon |= conn->waitfor & (KEEP_RECV|KEEP_SEND);
1283 /* limit-rate logic: if speed exceeds threshold, then do not include fd in
1284 select set. The current speed is recalculated in each Curl_readwrite()
1286 if((keepon & KEEP_SEND) &&
1287 (!data->set.max_send_speed ||
1288 (data->progress.ulspeed < data->set.max_send_speed) )) {
1289 k->keepon &= ~KEEP_SEND_HOLD;
1292 if (data->set.upload && data->set.max_send_speed &&
1293 (data->progress.ulspeed > data->set.max_send_speed) ) {
1294 /* calculate upload rate-limitation timeout. */
1295 buffersize = (int)(data->set.buffer_size ?
1296 data->set.buffer_size : BUFSIZE);
1297 totmp = (int)Curl_sleep_time(data->set.max_send_speed,
1298 data->progress.ulspeed, buffersize);
1299 if (totmp < timeout_ms)
1302 fd_write = CURL_SOCKET_BAD;
1303 if(keepon & KEEP_SEND)
1304 k->keepon |= KEEP_SEND_HOLD; /* hold it */
1307 if((keepon & KEEP_RECV) &&
1308 (!data->set.max_recv_speed ||
1309 (data->progress.dlspeed < data->set.max_recv_speed)) ) {
1310 k->keepon &= ~KEEP_RECV_HOLD;
1313 if ((!data->set.upload) && data->set.max_recv_speed &&
1314 (data->progress.dlspeed > data->set.max_recv_speed)) {
1315 /* Calculate download rate-limitation timeout. */
1316 buffersize = (int)(data->set.buffer_size ?
1317 data->set.buffer_size : BUFSIZE);
1318 totmp = (int)Curl_sleep_time(data->set.max_recv_speed,
1319 data->progress.dlspeed, buffersize);
1320 if (totmp < timeout_ms)
1323 fd_read = CURL_SOCKET_BAD;
1324 if(keepon & KEEP_RECV)
1325 k->keepon |= KEEP_RECV_HOLD; /* hold it */
1328 /* pause logic. Don't check descriptors for paused connections */
1329 if(k->keepon & KEEP_RECV_PAUSE)
1330 fd_read = CURL_SOCKET_BAD;
1331 if(k->keepon & KEEP_SEND_PAUSE)
1332 fd_write = CURL_SOCKET_BAD;
1334 /* The *_HOLD and *_PAUSE logic is necessary since even though there might
1335 be no traffic during the select interval, we still call
1336 Curl_readwrite() for the timeout case and if we limit transfer speed we
1337 must make sure that this function doesn't transfer anything while in
1340 The no timeout for the first round is for the protocols for which data
1341 has already been slurped off the socket and thus waiting for action
1342 won't work since it'll wait even though there is already data present
1345 ((fd_read != CURL_SOCKET_BAD) || (fd_write != CURL_SOCKET_BAD)))
1346 /* if this is the first lap and one of the file descriptors is fine
1347 to work with, skip the timeout */
1350 totmp = Curl_timeleft(conn, &k->now, FALSE);
1352 return CURLE_OPERATION_TIMEDOUT;
1356 if (totmp < timeout_ms)
1360 switch (Curl_socket_ready(fd_read, fd_write, timeout_ms)) {
1361 case -1: /* select() error, stop reading */
1363 /* The EINTR is not serious, and it seems you might get this more
1364 often when using the lib in a multi-threaded environment! */
1365 if(SOCKERRNO == EINTR)
1368 return CURLE_RECV_ERROR; /* indicate a network problem */
1369 case 0: /* timeout */
1370 default: /* readable descriptors */
1372 result = Curl_readwrite(conn, &done);
1373 /* "done" signals to us if the transfer(s) are ready */
1379 first = FALSE; /* not the first lap anymore */
1385 static void loadhostpairs(struct SessionHandle *data)
1387 struct curl_slist *hostp;
1392 for(hostp = data->change.resolve; hostp; hostp = hostp->next ) {
1395 if(hostp->data[0] == '-') {
1396 /* mark an entry for removal */
1398 else if(3 == sscanf(hostp->data, "%255[^:]:%d:%255s", hostname, &port,
1400 struct Curl_dns_entry *dns;
1401 Curl_addrinfo *addr;
1403 addr = Curl_str2addr(address, port);
1405 infof(data, "Resolve %s found illegal!\n", hostp->data);
1408 infof(data, "Added %s:%d:%s to DNS cache\n",
1409 hostname, port, address);
1412 Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
1414 /* put this host in the cache */
1415 dns = Curl_cache_addr(data, addr, hostname, port);
1418 Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
1421 data->change.resolve = NULL; /* dealt with now */
1426 * Curl_pretransfer() is called immediately before a transfer starts.
1428 CURLcode Curl_pretransfer(struct SessionHandle *data)
1431 if(!data->change.url) {
1432 /* we can't do anything without URL */
1433 failf(data, "No URL set!");
1434 return CURLE_URL_MALFORMAT;
1437 /* Init the SSL session ID cache here. We do it here since we want to do it
1438 after the *_setopt() calls (that could change the size of the cache) but
1439 before any transfer takes place. */
1440 res = Curl_ssl_initsessions(data, data->set.ssl.numsessions);
1444 data->set.followlocation=0; /* reset the location-follow counter */
1445 data->state.this_is_a_follow = FALSE; /* reset this */
1446 data->state.errorbuf = FALSE; /* no error has occurred */
1447 data->state.httpversion = 0; /* don't assume any particular server version */
1449 data->state.ssl_connect_retry = FALSE;
1451 data->state.authproblem = FALSE;
1452 data->state.authhost.want = data->set.httpauth;
1453 data->state.authproxy.want = data->set.proxyauth;
1454 Curl_safefree(data->info.wouldredirect);
1455 data->info.wouldredirect = NULL;
1457 /* If there is a list of cookie files to read, do it now! */
1458 if(data->change.cookielist)
1459 Curl_cookie_loadfiles(data);
1461 /* If there is a list of host pairs to deal with */
1462 if(data->change.resolve)
1463 loadhostpairs(data);
1465 /* Allow data->set.use_port to set which port to use. This needs to be
1466 * disabled for example when we follow Location: headers to URLs using
1467 * different ports! */
1468 data->state.allow_port = TRUE;
1470 #if defined(HAVE_SIGNAL) && defined(SIGPIPE) && !defined(HAVE_MSG_NOSIGNAL)
1471 /*************************************************************
1472 * Tell signal handler to ignore SIGPIPE
1473 *************************************************************/
1474 if(!data->set.no_signal)
1475 data->state.prev_signal = signal(SIGPIPE, SIG_IGN);
1478 Curl_initinfo(data); /* reset session-specific information "variables" */
1479 Curl_pgrsStartNow(data);
1481 if(data->set.timeout)
1482 Curl_expire(data, data->set.timeout);
1484 if(data->set.connecttimeout)
1485 Curl_expire(data, data->set.connecttimeout);
1491 * Curl_posttransfer() is called immediately after a transfer ends
1493 CURLcode Curl_posttransfer(struct SessionHandle *data)
1495 #if defined(HAVE_SIGNAL) && defined(SIGPIPE) && !defined(HAVE_MSG_NOSIGNAL)
1496 /* restore the signal handler for SIGPIPE before we get back */
1497 if(!data->set.no_signal)
1498 signal(SIGPIPE, data->state.prev_signal);
1500 (void)data; /* unused parameter */
1503 if(!(data->progress.flags & PGRS_HIDE) &&
1504 !data->progress.callback)
1505 /* only output if we don't use a progress callback and we're not hidden */
1506 fprintf(data->set.err, "\n");
1511 #ifndef CURL_DISABLE_HTTP
1513 * strlen_url() returns the length of the given URL if the spaces within the
1514 * URL were properly URL encoded.
1516 static size_t strlen_url(const char *url)
1520 bool left=TRUE; /* left side of the ? */
1522 for(ptr=url; *ptr; ptr++) {
1541 /* strcpy_url() copies a url to a output buffer and URL-encodes the spaces in
1542 * the source URL accordingly.
1544 static void strcpy_url(char *output, const char *url)
1546 /* we must add this with whitespace-replacing */
1549 char *optr = output;
1550 for(iptr = url; /* read from here */
1551 *iptr; /* until zero byte */
1562 *optr++='%'; /* add a '%' */
1563 *optr++='2'; /* add a '2' */
1564 *optr++='0'; /* add a '0' */
1567 *optr++='+'; /* add a '+' here */
1571 *optr=0; /* zero terminate output buffer */
1576 * Returns true if the given URL is absolute (as opposed to relative)
1578 static bool is_absolute_url(const char *url)
1580 char prot[16]; /* URL protocol string storage */
1581 char letter; /* used for a silly sscanf */
1583 return (bool)(2 == sscanf(url, "%15[^?&/:]://%c", prot, &letter));
1587 * Concatenate a relative URL to a base URL making it absolute.
1588 * URL-encodes any spaces.
1589 * The returned pointer must be freed by the caller unless NULL
1590 * (returns NULL on out of memory).
1592 static char *concat_url(const char *base, const char *relurl)
1595 TRY to append this new path to the old URL
1596 to the right of the host part. Oh crap, this is doomed to cause
1597 problems in the future...
1604 const char *useurl = relurl;
1607 /* we must make our own copy of the URL to play with, as it may
1608 point to read-only data */
1609 char *url_clone=strdup(base);
1612 return NULL; /* skip out of this NOW */
1614 /* protsep points to the start of the host name */
1615 protsep=strstr(url_clone, "//");
1619 protsep+=2; /* pass the slashes */
1621 if('/' != relurl[0]) {
1624 /* First we need to find out if there's a ?-letter in the URL,
1625 and cut it and the right-side of that off */
1626 pathsep = strchr(protsep, '?');
1630 /* we have a relative path to append to the last slash if there's one
1631 available, or if the new URL is just a query string (starts with a
1632 '?') we append the new one at the end of the entire currently worked
1634 if(useurl[0] != '?') {
1635 pathsep = strrchr(protsep, '/');
1640 /* Check if there's any slash after the host name, and if so, remember
1641 that position instead */
1642 pathsep = strchr(protsep, '/');
1644 protsep = pathsep+1;
1648 /* now deal with one "./" or any amount of "../" in the newurl
1649 and act accordingly */
1651 if((useurl[0] == '.') && (useurl[1] == '/'))
1652 useurl+=2; /* just skip the "./" */
1654 while((useurl[0] == '.') &&
1655 (useurl[1] == '.') &&
1656 (useurl[2] == '/')) {
1658 useurl+=3; /* pass the "../" */
1663 /* cut off one more level from the right of the original URL */
1664 pathsep = strrchr(protsep, '/');
1675 /* We got a new absolute path for this server, cut off from the
1677 pathsep = strchr(protsep, '/');
1679 /* When people use badly formatted URLs, such as
1680 "http://www.url.com?dir=/home/daniel" we must not use the first
1681 slash, if there's a ?-letter before it! */
1682 char *sep = strchr(protsep, '?');
1683 if(sep && (sep < pathsep))
1688 /* There was no slash. Now, since we might be operating on a badly
1689 formatted URL, such as "http://www.url.com?id=2380" which doesn't
1690 use a slash separator as it is supposed to, we need to check for a
1691 ?-letter as well! */
1692 pathsep = strchr(protsep, '?');
1698 /* If the new part contains a space, this is a mighty stupid redirect
1699 but we still make an effort to do "right". To the left of a '?'
1700 letter we replace each space with %20 while it is replaced with '+'
1701 on the right side of the '?' letter.
1703 newlen = strlen_url(useurl);
1705 urllen = strlen(url_clone);
1707 newest = malloc( urllen + 1 + /* possible slash */
1708 newlen + 1 /* zero byte */);
1711 free(url_clone); /* don't leak this */
1715 /* copy over the root url part */
1716 memcpy(newest, url_clone, urllen);
1718 /* check if we need to append a slash */
1719 if(('/' == useurl[0]) || (protsep && !*protsep) || ('?' == useurl[0]))
1722 newest[urllen++]='/';
1724 /* then append the new piece on the right side */
1725 strcpy_url(&newest[urllen], useurl);
1731 #endif /* CURL_DISABLE_HTTP */
1734 * Curl_follow() handles the URL redirect magic. Pass in the 'newurl' string
1735 * as given by the remote server and set up the new URL to request.
1737 CURLcode Curl_follow(struct SessionHandle *data,
1738 char *newurl, /* this 'newurl' is the Location: string,
1739 and it must be malloc()ed before passed
1741 followtype type) /* see transfer.h */
1743 #ifdef CURL_DISABLE_HTTP
1747 /* Location: following will not happen when HTTP is disabled */
1748 return CURLE_TOO_MANY_REDIRECTS;
1751 /* Location: redirect */
1752 bool disallowport = FALSE;
1754 if(type == FOLLOW_REDIR) {
1755 if((data->set.maxredirs != -1) &&
1756 (data->set.followlocation >= data->set.maxredirs)) {
1757 failf(data,"Maximum (%ld) redirects followed", data->set.maxredirs);
1758 return CURLE_TOO_MANY_REDIRECTS;
1761 /* mark the next request as a followed location: */
1762 data->state.this_is_a_follow = TRUE;
1764 data->set.followlocation++; /* count location-followers */
1766 if(data->set.http_auto_referer) {
1767 /* We are asked to automatically set the previous URL as the referer
1768 when we get the next URL. We pick the ->url field, which may or may
1769 not be 100% correct */
1771 if(data->change.referer_alloc)
1772 /* If we already have an allocated referer, free this first */
1773 free(data->change.referer);
1775 data->change.referer = strdup(data->change.url);
1776 if (!data->change.referer) {
1777 data->change.referer_alloc = FALSE;
1778 return CURLE_OUT_OF_MEMORY;
1780 data->change.referer_alloc = TRUE; /* yes, free this later */
1784 if(!is_absolute_url(newurl)) {
1786 *DANG* this is an RFC 2068 violation. The URL is supposed
1787 to be absolute and this doesn't seem to be that!
1789 char *absolute = concat_url(data->change.url, newurl);
1791 return CURLE_OUT_OF_MEMORY;
1796 /* This is an absolute URL, don't allow the custom port number */
1797 disallowport = TRUE;
1799 if(strchr(newurl, ' ')) {
1800 /* This new URL contains at least one space, this is a mighty stupid
1801 redirect but we still make an effort to do "right". */
1803 size_t newlen = strlen_url(newurl);
1805 newest = malloc(newlen+1); /* get memory for this */
1807 return CURLE_OUT_OF_MEMORY;
1808 strcpy_url(newest, newurl); /* create a space-free URL */
1810 free(newurl); /* that was no good */
1811 newurl = newest; /* use this instead now */
1816 if(type == FOLLOW_FAKE) {
1817 /* we're only figuring out the new url if we would've followed locations
1818 but now we're done so we can get out! */
1819 data->info.wouldredirect = newurl;
1824 data->state.allow_port = FALSE;
1826 if(data->change.url_alloc)
1827 free(data->change.url);
1829 data->change.url_alloc = TRUE; /* the URL is allocated */
1831 data->change.url = newurl;
1832 newurl = NULL; /* don't free! */
1834 infof(data, "Issue another request to this URL: '%s'\n", data->change.url);
1837 * We get here when the HTTP code is 300-399 (and 401). We need to perform
1838 * differently based on exactly what return code there was.
1840 * News from 7.10.6: we can also get here on a 401 or 407, in case we act on
1841 * a HTTP (proxy-) authentication scheme other than Basic.
1843 switch(data->info.httpcode) {
1844 /* 401 - Act on a WWW-Authenticate, we keep on moving and do the
1845 Authorization: XXXX header in the HTTP request code snippet */
1846 /* 407 - Act on a Proxy-Authenticate, we keep on moving and do the
1847 Proxy-Authorization: XXXX header in the HTTP request code snippet */
1848 /* 300 - Multiple Choices */
1849 /* 306 - Not used */
1850 /* 307 - Temporary Redirect */
1851 default: /* for all above (and the unknown ones) */
1852 /* Some codes are explicitly mentioned since I've checked RFC2616 and they
1853 * seem to be OK to POST to.
1856 case 301: /* Moved Permanently */
1857 /* (quote from RFC2616, section 10.3.2):
1859 * Note: When automatically redirecting a POST request after receiving a
1860 * 301 status code, some existing HTTP/1.0 user agents will erroneously
1861 * change it into a GET request.
1865 * Warning: Because most of importants user agents do this obvious RFC2616
1866 * violation, many webservers expect this misbehavior. So these servers
1867 * often answers to a POST request with an error page. To be sure that
1868 * libcurl gets the page that most user agents would get, libcurl has to
1871 * This behaviour can be overridden with CURLOPT_POSTREDIR.
1873 if( (data->set.httpreq == HTTPREQ_POST
1874 || data->set.httpreq == HTTPREQ_POST_FORM)
1875 && !data->set.post301) {
1877 "Violate RFC 2616/10.3.2 and switch from POST to GET\n");
1878 data->set.httpreq = HTTPREQ_GET;
1881 case 302: /* Found */
1884 Note: RFC 1945 and RFC 2068 specify that the client is not allowed
1885 to change the method on the redirected request. However, most
1886 existing user agent implementations treat 302 as if it were a 303
1887 response, performing a GET on the Location field-value regardless
1888 of the original request method. The status codes 303 and 307 have
1889 been added for servers that wish to make unambiguously clear which
1890 kind of reaction is expected of the client.
1894 Note: Many pre-HTTP/1.1 user agents do not understand the 303
1895 status. When interoperability with such clients is a concern, the
1896 302 status code may be used instead, since most user agents react
1897 to a 302 response as described here for 303.
1899 This behaviour can be overriden with CURLOPT_POSTREDIR
1901 if( (data->set.httpreq == HTTPREQ_POST
1902 || data->set.httpreq == HTTPREQ_POST_FORM)
1903 && !data->set.post302) {
1905 "Violate RFC 2616/10.3.3 and switch from POST to GET\n");
1906 data->set.httpreq = HTTPREQ_GET;
1910 case 303: /* See Other */
1911 /* Disable both types of POSTs, since doing a second POST when
1912 * following isn't what anyone would want! */
1913 if(data->set.httpreq != HTTPREQ_GET) {
1914 data->set.httpreq = HTTPREQ_GET; /* enforce GET request */
1915 infof(data, "Disables POST, goes with %s\n",
1916 data->set.opt_no_body?"HEAD":"GET");
1919 case 304: /* Not Modified */
1920 /* 304 means we did a conditional request and it was "Not modified".
1921 * We shouldn't get any Location: header in this response!
1924 case 305: /* Use Proxy */
1925 /* (quote from RFC2616, section 10.3.6):
1926 * "The requested resource MUST be accessed through the proxy given
1927 * by the Location field. The Location field gives the URI of the
1928 * proxy. The recipient is expected to repeat this single request
1929 * via the proxy. 305 responses MUST only be generated by origin
1934 Curl_pgrsTime(data, TIMER_REDIRECT);
1935 Curl_pgrsResetTimes(data);
1938 #endif /* CURL_DISABLE_HTTP */
1942 connect_host(struct SessionHandle *data,
1943 struct connectdata **conn)
1945 CURLcode res = CURLE_OK;
1948 bool protocol_done=TRUE; /* will be TRUE always since this is only used
1949 within the easy interface */
1950 Curl_pgrsTime(data, TIMER_STARTSINGLE);
1951 res = Curl_connect(data, conn, &async, &protocol_done);
1953 if((CURLE_OK == res) && async) {
1954 /* Now, if async is TRUE here, we need to wait for the name
1956 res = Curl_wait_for_resolv(*conn, NULL);
1958 /* Resolved, continue with the connection */
1959 res = Curl_async_resolved(*conn, &protocol_done);
1961 /* if we can't resolve, we kill this "connection" now */
1962 (void)Curl_disconnect(*conn, /* dead_connection */ FALSE);
1969 Curl_reconnect_request(struct connectdata **connp)
1971 CURLcode result = CURLE_OK;
1972 struct connectdata *conn = *connp;
1973 struct SessionHandle *data = conn->data;
1975 /* This was a re-use of a connection and we got a write error in the
1976 * DO-phase. Then we DISCONNECT this connection and have another attempt to
1977 * CONNECT and then DO again! The retry cannot possibly find another
1978 * connection to re-use, since we only keep one possible connection for
1981 infof(data, "Re-used connection seems dead, get a new one\n");
1983 conn->bits.close = TRUE; /* enforce close of this connection */
1984 result = Curl_done(&conn, result, FALSE); /* we are so done with this */
1986 /* conn may no longer be a good pointer */
1989 * According to bug report #1330310. We need to check for CURLE_SEND_ERROR
1990 * here as well. I figure this could happen when the request failed on a FTP
1991 * connection and thus Curl_done() itself tried to use the connection
1992 * (again). Slight Lack of feedback in the report, but I don't think this
1993 * extra check can do much harm.
1995 if((CURLE_OK == result) || (CURLE_SEND_ERROR == result)) {
1997 bool protocol_done = TRUE;
1999 /* Now, redo the connect and get a new connection */
2000 result = Curl_connect(data, connp, &async, &protocol_done);
2001 if(CURLE_OK == result) {
2002 /* We have connected or sent away a name resolve query fine */
2004 conn = *connp; /* setup conn to again point to something nice */
2006 /* Now, if async is TRUE here, we need to wait for the name
2008 result = Curl_wait_for_resolv(conn, NULL);
2012 /* Resolved, continue with the connection */
2013 result = Curl_async_resolved(conn, &protocol_done);
2023 /* Returns CURLE_OK *and* sets '*url' if a request retry is wanted.
2025 NOTE: that the *url is malloc()ed. */
2026 CURLcode Curl_retry_request(struct connectdata *conn,
2029 struct SessionHandle *data = conn->data;
2033 /* if we're talking upload, we can't do the checks below, unless the protocol
2034 is HTTP as when uploading over HTTP we will still get a response */
2035 if(data->set.upload && !(conn->protocol&(PROT_HTTP|PROT_RTSP)))
2038 if(/* workaround for broken TLS servers */ data->state.ssl_connect_retry ||
2039 ((data->req.bytecount +
2040 data->req.headerbytecount == 0) &&
2042 !data->set.opt_no_body &&
2043 data->set.rtspreq != RTSPREQ_RECEIVE)) {
2044 /* We got no data, we attempted to re-use a connection and yet we want a
2045 "body". This might happen if the connection was left alive when we were
2046 done using it before, but that was closed when we wanted to read from
2047 it again. Bad luck. Retry the same request on a fresh connect! */
2048 infof(conn->data, "Connection died, retrying a fresh connect\n");
2049 *url = strdup(conn->data->change.url);
2051 return CURLE_OUT_OF_MEMORY;
2053 conn->bits.close = TRUE; /* close this connection */
2054 conn->bits.retry = TRUE; /* mark this as a connection we're about
2055 to retry. Marking it this way should
2056 prevent i.e HTTP transfers to return
2057 error just because nothing has been
2063 static CURLcode Curl_do_perform(struct SessionHandle *data)
2067 struct connectdata *conn=NULL;
2068 char *newurl = NULL; /* possibly a new URL to follow to! */
2069 followtype follow = FOLLOW_NONE;
2071 data->state.used_interface = Curl_if_easy;
2073 res = Curl_pretransfer(data);
2078 * It is important that there is NO 'return' from this function at any other
2079 * place than falling down to the end of the function! This is because we
2080 * have cleanup stuff that must be done before we get back, and that is only
2081 * performed after this do-while loop.
2085 res = connect_host(data, &conn); /* primary connection */
2087 if(res == CURLE_OK) {
2089 if(data->set.connect_only) {
2090 /* keep connection open for application to use the socket */
2091 conn->bits.close = FALSE;
2092 res = Curl_done(&conn, CURLE_OK, FALSE);
2095 res = Curl_do(&conn, &do_done);
2097 if(res == CURLE_OK) {
2098 if(conn->data->set.wildcardmatch) {
2099 if(conn->data->wildcard.state == CURLWC_DONE ||
2100 conn->data->wildcard.state == CURLWC_SKIP) {
2101 /* keep connection open for application to use the socket */
2102 conn->bits.close = FALSE;
2103 res = Curl_done(&conn, CURLE_OK, FALSE);
2107 res = Transfer(conn); /* now fetch that URL please */
2108 if((res == CURLE_OK) || (res == CURLE_RECV_ERROR)) {
2110 CURLcode rc = Curl_retry_request(conn, &newurl);
2114 retry = (newurl?TRUE:FALSE);
2117 /* we know (newurl != NULL) at this point */
2119 follow = FOLLOW_RETRY;
2121 else if (res == CURLE_OK) {
2123 * We must duplicate the new URL here as the connection data may
2124 * be free()ed in the Curl_done() function. We prefer the newurl
2125 * one since that's used for redirects or just further requests
2126 * for retries or multi-stage HTTP auth methods etc.
2128 if(data->req.newurl) {
2129 follow = FOLLOW_REDIR;
2130 newurl = strdup(data->req.newurl);
2132 res = CURLE_OUT_OF_MEMORY;
2134 else if(data->req.location) {
2135 follow = FOLLOW_FAKE;
2136 newurl = strdup(data->req.location);
2138 res = CURLE_OUT_OF_MEMORY;
2142 /* in the above cases where 'newurl' gets assigned, we have a fresh
2143 * allocated memory pointed to */
2145 if(res != CURLE_OK) {
2146 /* The transfer phase returned error, we mark the connection to get
2147 * closed to prevent being re-used. This is because we can't
2148 * possibly know if the connection is in a good shape or not now. */
2149 conn->bits.close = TRUE;
2151 if(CURL_SOCKET_BAD != conn->sock[SECONDARYSOCKET]) {
2152 /* if we failed anywhere, we must clean up the secondary socket if
2154 sclose(conn->sock[SECONDARYSOCKET]);
2155 conn->sock[SECONDARYSOCKET] = CURL_SOCKET_BAD;
2159 /* Always run Curl_done(), even if some of the previous calls
2160 failed, but return the previous (original) error code */
2161 res2 = Curl_done(&conn, res, FALSE);
2167 /* Curl_do() failed, clean up left-overs in the done-call, but note
2168 that at some cases the conn pointer is NULL when Curl_do() failed
2169 and the connection cache is very small so only call Curl_done() if
2170 conn is still "alive". */
2171 /* ignore return code since we already have an error to return */
2172 (void)Curl_done(&conn, res, FALSE);
2175 * Important: 'conn' cannot be used here, since it may have been closed
2176 * in 'Curl_done' or other functions.
2179 if((res == CURLE_OK) && follow) {
2180 res = Curl_follow(data, newurl, follow);
2181 if(CURLE_OK == res) {
2182 /* if things went fine, Curl_follow() freed or otherwise took
2183 responsibility for the newurl pointer */
2185 if(follow >= FOLLOW_RETRY) {
2186 follow = FOLLOW_NONE;
2189 /* else we break out of the loop below */
2193 break; /* it only reaches here when this shouldn't loop */
2195 } /* loop if Location: */
2200 if(res && !data->state.errorbuf) {
2202 * As an extra precaution: if no error string has been set and there was
2203 * an error, use the strerror() string or if things are so bad that not
2204 * even that is good, set a bad string that mentions the error code.
2206 const char *str = curl_easy_strerror(res);
2208 failf(data, "unspecified error %d", (int)res);
2210 failf(data, "%s", str);
2213 /* run post-transfer unconditionally, but don't clobber the return code if
2214 we already have an error code recorder */
2215 res2 = Curl_posttransfer(data);
2223 * Curl_perform() is the internal high-level function that gets called by the
2224 * external curl_easy_perform() function. It inits, performs and cleans up a
2225 * single file transfer.
2227 CURLcode Curl_perform(struct SessionHandle *data)
2230 if(!data->set.wildcardmatch)
2231 return Curl_do_perform(data);
2233 /* init main wildcard structures */
2234 res = Curl_wildcard_init(&data->wildcard);
2238 res = Curl_do_perform(data);
2240 Curl_wildcard_dtor(&data->wildcard);
2245 while(!res && data->wildcard.state != CURLWC_DONE)
2246 res = Curl_do_perform(data);
2248 Curl_wildcard_dtor(&data->wildcard);
2250 /* wildcard download finished or failed */
2251 data->wildcard.state = CURLWC_INIT;
2256 * Curl_setup_transfer() is called to setup some basic properties for the
2257 * upcoming transfer.
2260 Curl_setup_transfer(
2261 struct connectdata *conn, /* connection data */
2262 int sockindex, /* socket index to read from or -1 */
2263 curl_off_t size, /* -1 if unknown at this point */
2264 bool getheader, /* TRUE if header parsing is wanted */
2265 curl_off_t *bytecountp, /* return number of bytes read or NULL */
2266 int writesockindex, /* socket index to write to, it may very well be
2267 the same we read from. -1 disables */
2268 curl_off_t *writecountp /* return number of bytes written or NULL */
2271 struct SessionHandle *data;
2272 struct SingleRequest *k;
2274 DEBUGASSERT(conn != NULL);
2279 DEBUGASSERT((sockindex <= 1) && (sockindex >= -1));
2281 /* now copy all input parameters */
2282 conn->sockfd = sockindex == -1 ?
2283 CURL_SOCKET_BAD : conn->sock[sockindex];
2284 conn->writesockfd = writesockindex == -1 ?
2285 CURL_SOCKET_BAD:conn->sock[writesockindex];
2286 k->getheader = getheader;
2289 k->bytecountp = bytecountp;
2290 k->writebytecountp = writecountp;
2292 /* The code sequence below is placed in this function just because all
2293 necessary input is not always known in do_complete() as this function may
2294 be called after that */
2299 Curl_pgrsSetDownloadSize(data, size);
2301 /* we want header and/or body, if neither then don't do this! */
2302 if(k->getheader || !data->set.opt_no_body) {
2304 if(conn->sockfd != CURL_SOCKET_BAD)
2305 k->keepon |= KEEP_RECV;
2307 if(conn->writesockfd != CURL_SOCKET_BAD) {
2310 Even if we require a 100-return code before uploading data, we might
2311 need to write data before that since the REQUEST may not have been
2312 finished sent off just yet.
2314 Thus, we must check if the request has been sent before we set the
2315 state info where we wait for the 100-return code
2317 if((data->state.expect100header) &&
2318 (data->state.proto.http->sending == HTTPSEND_BODY)) {
2319 /* wait with write until we either got 100-continue or a timeout */
2320 k->exp100 = EXP100_AWAITING_CONTINUE;
2321 k->start100 = k->start;
2323 /* set a timeout for the multi interface */
2324 Curl_expire(data, CURL_TIMEOUT_EXPECT_100);
2327 if(data->state.expect100header)
2328 /* when we've sent off the rest of the headers, we must await a
2329 100-continue but first finish sending the request */
2330 k->exp100 = EXP100_SENDING_REQUEST;
2332 /* enable the write bit when we're not waiting for continue */
2333 k->keepon |= KEEP_SEND;
2335 } /* if(conn->writesockfd != CURL_SOCKET_BAD) */
2336 } /* if(k->getheader || !data->set.opt_no_body) */