diff options
Diffstat (limited to 'libcurl/src/lib/transfer.c')
| -rw-r--r-- | libcurl/src/lib/transfer.c | 2004 |
1 files changed, 2004 insertions, 0 deletions
diff --git a/libcurl/src/lib/transfer.c b/libcurl/src/lib/transfer.c new file mode 100644 index 0000000..227dc83 --- /dev/null +++ b/libcurl/src/lib/transfer.c @@ -0,0 +1,2004 @@ +/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#include "strtoofft.h"
+#include "strequal.h"
+#include "rawstr.h"
+
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#ifdef HAVE_NET_IF_H
+#include <net/if.h>
+#endif
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+#ifdef HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+
+#ifndef HAVE_SOCKET
+#error "We can't compile without socket() support!"
+#endif
+
+#include "urldata.h"
+#include <curl/curl.h>
+#include "netrc.h"
+
+#include "content_encoding.h"
+#include "hostip.h"
+#include "transfer.h"
+#include "sendf.h"
+#include "speedcheck.h"
+#include "progress.h"
+#include "http.h"
+#include "url.h"
+#include "getinfo.h"
+#include "vtls/vtls.h"
+#include "http_digest.h"
+#include "curl_ntlm.h"
+#include "http_negotiate.h"
+#include "share.h"
+#include "select.h"
+#include "multiif.h"
+#include "connect.h"
+#include "non-ascii.h"
+#include "curl_printf.h"
+
+/* The last #include files should be: */
+#include "curl_memory.h"
+#include "memdebug.h"
+
+/*
+ * This function will call the read callback to fill our buffer with data
+ * to upload.
+ */
+CURL_STATIC CURLcode Curl_fillreadbuffer(struct connectdata *conn, int bytes, int *nreadp)
+{
+ struct SessionHandle *data = conn->data;
+ size_t buffersize = (size_t)bytes;
+ int nread;
+#ifdef CURL_DOES_CONVERSIONS
+ bool sending_http_headers = FALSE;
+
+ if(conn->handler->protocol&(PROTO_FAMILY_HTTP|CURLPROTO_RTSP)) {
+ const struct HTTP *http = data->req.protop;
+
+ if(http->sending == HTTPSEND_REQUEST)
+ /* We're sending the HTTP request headers, not the data.
+ Remember that so we don't re-translate them into garbage. */
+ sending_http_headers = TRUE;
+ }
+#endif
+
+ if(data->req.upload_chunky) {
+ /* if chunked Transfer-Encoding */
+ buffersize -= (8 + 2 + 2); /* 32bit hex + CRLF + CRLF */
+ data->req.upload_fromhere += (8 + 2); /* 32bit hex + CRLF */
+ }
+
+ /* this function returns a size_t, so we typecast to int to prevent warnings
+ with picky compilers */
+ nread = (int)conn->fread_func(data->req.upload_fromhere, 1,
+ buffersize, conn->fread_in);
+
+ if(nread == CURL_READFUNC_ABORT) {
+ failf(data, "operation aborted by callback");
+ *nreadp = 0;
+ return CURLE_ABORTED_BY_CALLBACK;
+ }
+ else if(nread == CURL_READFUNC_PAUSE) {
+
+ if(conn->handler->flags & PROTOPT_NONETWORK) {
+ /* protocols that work without network cannot be paused. This is
+ actually only FILE:// just now, and it can't pause since the transfer
+ isn't done using the "normal" procedure. */
+ failf(data, "Read callback asked for PAUSE when not supported!");
+ return CURLE_READ_ERROR;
+ }
+ else {
+ struct SingleRequest *k = &data->req;
+ /* CURL_READFUNC_PAUSE pauses read callbacks that feed socket writes */
+ k->keepon |= KEEP_SEND_PAUSE; /* mark socket send as paused */
+ if(data->req.upload_chunky) {
+ /* Back out the preallocation done above */
+ data->req.upload_fromhere -= (8 + 2);
+ }
+ *nreadp = 0;
+ }
+ return CURLE_OK; /* nothing was read */
+ }
+ else if((size_t)nread > buffersize) {
+ /* the read function returned a too large value */
+ *nreadp = 0;
+ failf(data, "read function returned funny value");
+ return CURLE_READ_ERROR;
+ }
+
+ if(!data->req.forbidchunk && data->req.upload_chunky) {
+ /* if chunked Transfer-Encoding
+ * build chunk:
+ *
+ * <HEX SIZE> CRLF
+ * <DATA> CRLF
+ */
+ /* On non-ASCII platforms the <DATA> may or may not be
+ translated based on set.prefer_ascii while the protocol
+ portion must always be translated to the network encoding.
+ To further complicate matters, line end conversion might be
+ done later on, so we need to prevent CRLFs from becoming
+ CRCRLFs if that's the case. To do this we use bare LFs
+ here, knowing they'll become CRLFs later on.
+ */
+
+ char hexbuffer[11];
+ const char *endofline_native;
+ const char *endofline_network;
+ int hexlen;
+
+ if(
+#ifdef CURL_DO_LINEEND_CONV
+ (data->set.prefer_ascii) ||
+#endif
+ (data->set.crlf)) {
+ /* \n will become \r\n later on */
+ endofline_native = "\n";
+ endofline_network = "\x0a";
+ }
+ else {
+ endofline_native = "\r\n";
+ endofline_network = "\x0d\x0a";
+ }
+ hexlen = snprintf(hexbuffer, sizeof(hexbuffer),
+ "%x%s", nread, endofline_native);
+
+ /* move buffer pointer */
+ data->req.upload_fromhere -= hexlen;
+ nread += hexlen;
+
+ /* copy the prefix to the buffer, leaving out the NUL */
+ memcpy(data->req.upload_fromhere, hexbuffer, hexlen);
+
+ /* always append ASCII CRLF to the data */
+ memcpy(data->req.upload_fromhere + nread,
+ endofline_network,
+ strlen(endofline_network));
+
+#ifdef CURL_DOES_CONVERSIONS
+ CURLcode result;
+ int length;
+ if(data->set.prefer_ascii) {
+ /* translate the protocol and data */
+ length = nread;
+ }
+ else {
+ /* just translate the protocol portion */
+ length = strlen(hexbuffer);
+ }
+ result = Curl_convert_to_network(data, data->req.upload_fromhere, length);
+ /* Curl_convert_to_network calls failf if unsuccessful */
+ if(result)
+ return result;
+#endif /* CURL_DOES_CONVERSIONS */
+
+ if((nread - hexlen) == 0)
+ /* mark this as done once this chunk is transferred */
+ data->req.upload_done = TRUE;
+
+ nread+=(int)strlen(endofline_native); /* for the added end of line */
+ }
+#ifdef CURL_DOES_CONVERSIONS
+ else if((data->set.prefer_ascii) && (!sending_http_headers)) {
+ CURLcode result;
+ result = Curl_convert_to_network(data, data->req.upload_fromhere, nread);
+ /* Curl_convert_to_network calls failf if unsuccessful */
+ if(result)
+ return result;
+ }
+#endif /* CURL_DOES_CONVERSIONS */
+
+ *nreadp = nread;
+
+ return CURLE_OK;
+}
+
+
+/*
+ * Curl_readrewind() rewinds the read stream. This is typically used for HTTP
+ * POST/PUT with multi-pass authentication when a sending was denied and a
+ * resend is necessary.
+ */
+CURL_STATIC CURLcode Curl_readrewind(struct connectdata *conn)
+{
+ struct SessionHandle *data = conn->data;
+
+ conn->bits.rewindaftersend = FALSE; /* we rewind now */
+
+ /* explicitly switch off sending data on this connection now since we are
+ about to restart a new transfer and thus we want to avoid inadvertently
+ sending more data on the existing connection until the next transfer
+ starts */
+ data->req.keepon &= ~KEEP_SEND;
+
+ /* We have sent away data. If not using CURLOPT_POSTFIELDS or
+ CURLOPT_HTTPPOST, call app to rewind
+ */
+ if(data->set.postfields ||
+ (data->set.httpreq == HTTPREQ_POST_FORM))
+ ; /* do nothing */
+ else {
+ if(data->set.seek_func) {
+ int err;
+
+ err = (data->set.seek_func)(data->set.seek_client, 0, SEEK_SET);
+ if(err) {
+ failf(data, "seek callback returned error %d", (int)err);
+ return CURLE_SEND_FAIL_REWIND;
+ }
+ }
+ else if(data->set.ioctl_func) {
+ curlioerr err;
+
+ err = (data->set.ioctl_func)(data, CURLIOCMD_RESTARTREAD,
+ data->set.ioctl_client);
+ infof(data, "the ioctl callback returned %d\n", (int)err);
+
+ if(err) {
+ /* FIXME: convert to a human readable error message */
+ failf(data, "ioctl callback returned error %d", (int)err);
+ return CURLE_SEND_FAIL_REWIND;
+ }
+ }
+ else {
+ /* If no CURLOPT_READFUNCTION is used, we know that we operate on a
+ given FILE * stream and we can actually attempt to rewind that
+ ourselves with fseek() */
+ if(data->set.fread_func == (curl_read_callback)fread) {
+ if(-1 != fseek(data->set.in, 0, SEEK_SET))
+ /* successful rewind */
+ return CURLE_OK;
+ }
+
+ /* no callback set or failure above, makes us fail at once */
+ failf(data, "necessary data rewind wasn't possible");
+ return CURLE_SEND_FAIL_REWIND;
+ }
+ }
+ return CURLE_OK;
+}
+
+static int data_pending(const struct connectdata *conn)
+{
+ /* in the case of libssh2, we can never be really sure that we have emptied
+ its internal buffers so we MUST always try until we get EAGAIN back */
+ return conn->handler->protocol&(CURLPROTO_SCP|CURLPROTO_SFTP) ||
+#if defined(USE_NGHTTP2)
+ Curl_ssl_data_pending(conn, FIRSTSOCKET) ||
+ /* For HTTP/2, we may read up everything including responde body
+ with header fields in Curl_http_readwrite_headers. If no
+ content-length is provided, curl waits for the connection
+ close, which we emulate it using conn->proto.httpc.closed =
+ TRUE. The thing is if we read everything, then http2_recv won't
+ be called and we cannot signal the HTTP/2 stream has closed. As
+ a workaround, we return nonzero here to call http2_recv. */
+ ((conn->handler->protocol&PROTO_FAMILY_HTTP) && conn->httpversion == 20 &&
+ conn->proto.httpc.closed);
+#else
+ Curl_ssl_data_pending(conn, FIRSTSOCKET);
+#endif
+}
+
+static void read_rewind(struct connectdata *conn,
+ size_t thismuch)
+{
+ DEBUGASSERT(conn->read_pos >= thismuch);
+
+ conn->read_pos -= thismuch;
+ conn->bits.stream_was_rewound = TRUE;
+
+#ifdef DEBUGBUILD
+ {
+ char buf[512 + 1];
+ size_t show;
+
+ show = CURLMIN(conn->buf_len - conn->read_pos, sizeof(buf)-1);
+ if(conn->master_buffer) {
+ memcpy(buf, conn->master_buffer + conn->read_pos, show);
+ buf[show] = '\0';
+ }
+ else {
+ buf[0] = '\0';
+ }
+
+ DEBUGF(infof(conn->data,
+ "Buffer after stream rewind (read_pos = %zu): [%s]\n",
+ conn->read_pos, buf));
+ }
+#endif
+}
+
+/*
+ * Check to see if CURLOPT_TIMECONDITION was met by comparing the time of the
+ * remote document with the time provided by CURLOPT_TIMEVAL
+ */
+CURL_STATIC bool Curl_meets_timecondition(struct SessionHandle *data, time_t timeofdoc)
+{
+ if((timeofdoc == 0) || (data->set.timevalue == 0))
+ return TRUE;
+
+ switch(data->set.timecondition) {
+ case CURL_TIMECOND_IFMODSINCE:
+ default:
+ if(timeofdoc <= data->set.timevalue) {
+ infof(data,
+ "The requested document is not new enough\n");
+ data->info.timecond = TRUE;
+ return FALSE;
+ }
+ break;
+ case CURL_TIMECOND_IFUNMODSINCE:
+ if(timeofdoc >= data->set.timevalue) {
+ infof(data,
+ "The requested document is not old enough\n");
+ data->info.timecond = TRUE;
+ return FALSE;
+ }
+ break;
+ }
+
+ return TRUE;
+}
+
+/*
+ * Go ahead and do a read if we have a readable socket or if
+ * the stream was rewound (in which case we have data in a
+ * buffer)
+ */
+static CURLcode readwrite_data(struct SessionHandle *data,
+ struct connectdata *conn,
+ struct SingleRequest *k,
+ int *didwhat, bool *done)
+{
+ CURLcode result = CURLE_OK;
+ ssize_t nread; /* number of bytes read */
+ size_t excess = 0; /* excess bytes read */
+ bool is_empty_data = FALSE;
+ bool readmore = FALSE; /* used by RTP to signal for more data */
+
+ *done = FALSE;
+
+ /* This is where we loop until we have read everything there is to
+ read or we get a CURLE_AGAIN */
+ do {
+ size_t buffersize = data->set.buffer_size?
+ data->set.buffer_size : BUFSIZE;
+ size_t bytestoread = buffersize;
+
+ if(k->size != -1 && !k->header) {
+ /* make sure we don't read "too much" if we can help it since we
+ might be pipelining and then someone else might want to read what
+ follows! */
+ curl_off_t totalleft = k->size - k->bytecount;
+ if(totalleft < (curl_off_t)bytestoread)
+ bytestoread = (size_t)totalleft;
+ }
+
+ if(bytestoread) {
+ /* receive data from the network! */
+ result = Curl_read(conn, conn->sockfd, k->buf, bytestoread, &nread);
+
+ /* read would've blocked */
+ if(CURLE_AGAIN == result)
+ break; /* get out of loop */
+
+ if(result>0)
+ return result;
+ }
+ else {
+ /* read nothing but since we wanted nothing we consider this an OK
+ situation to proceed from */
+ nread = 0;
+ }
+
+ if((k->bytecount == 0) && (k->writebytecount == 0)) {
+ Curl_pgrsTime(data, TIMER_STARTTRANSFER);
+ if(k->exp100 > EXP100_SEND_DATA)
+ /* set time stamp to compare with when waiting for the 100 */
+ k->start100 = Curl_tvnow();
+ }
+
+ *didwhat |= KEEP_RECV;
+ /* indicates data of zero size, i.e. empty file */
+ is_empty_data = ((nread == 0) && (k->bodywrites == 0)) ? TRUE : FALSE;
+
+ /* NUL terminate, allowing string ops to be used */
+ if(0 < nread || is_empty_data) {
+ k->buf[nread] = 0;
+ }
+ else if(0 >= nread) {
+ /* if we receive 0 or less here, the server closed the connection
+ and we bail out from this! */
+ DEBUGF(infof(data, "nread <= 0, server closed connection, bailing\n"));
+ k->keepon &= ~KEEP_RECV;
+ break;
+ }
+
+ /* Default buffer to use when we write the buffer, it may be changed
+ in the flow below before the actual storing is done. */
+ k->str = k->buf;
+
+ if(conn->handler->readwrite) {
+ result = conn->handler->readwrite(data, conn, &nread, &readmore);
+ if(result)
+ return result;
+ if(readmore)
+ break;
+ }
+
+#ifndef CURL_DISABLE_HTTP
+ /* Since this is a two-state thing, we check if we are parsing
+ headers at the moment or not. */
+ if(k->header) {
+ /* we are in parse-the-header-mode */
+ bool stop_reading = FALSE;
+ result = Curl_http_readwrite_headers(data, conn, &nread, &stop_reading);
+ if(result)
+ return result;
+
+ if(conn->handler->readwrite &&
+ (k->maxdownload <= 0 && nread > 0)) {
+ result = conn->handler->readwrite(data, conn, &nread, &readmore);
+ if(result)
+ return result;
+ if(readmore)
+ break;
+ }
+
+ if(stop_reading) {
+ /* We've stopped dealing with input, get out of the do-while loop */
+
+ if(nread > 0) {
+ if(Curl_multi_pipeline_enabled(conn->data->multi)) {
+ infof(data,
+ "Rewinding stream by : %zd"
+ " bytes on url %s (zero-length body)\n",
+ nread, data->state.path);
+ read_rewind(conn, (size_t)nread);
+ }
+ else {
+ infof(data,
+ "Excess found in a non pipelined read:"
+ " excess = %zd"
+ " url = %s (zero-length body)\n",
+ nread, data->state.path);
+ }
+ }
+
+ break;
+ }
+ }
+#endif /* CURL_DISABLE_HTTP */
+
+
+ /* This is not an 'else if' since it may be a rest from the header
+ parsing, where the beginning of the buffer is headers and the end
+ is non-headers. */
+ if(k->str && !k->header && (nread > 0 || is_empty_data)) {
+
+#ifndef CURL_DISABLE_HTTP
+ if(0 == k->bodywrites && !is_empty_data) {
+ /* These checks are only made the first time we are about to
+ write a piece of the body */
+ if(conn->handler->protocol&(PROTO_FAMILY_HTTP|CURLPROTO_RTSP)) {
+ /* HTTP-only checks */
+
+ if(data->req.newurl) {
+ if(conn->bits.close) {
+ /* Abort after the headers if "follow Location" is set
+ and we're set to close anyway. */
+ k->keepon &= ~KEEP_RECV;
+ *done = TRUE;
+ return CURLE_OK;
+ }
+ /* We have a new url to load, but since we want to be able
+ to re-use this connection properly, we read the full
+ response in "ignore more" */
+ k->ignorebody = TRUE;
+ infof(data, "Ignoring the response-body\n");
+ }
+ if(data->state.resume_from && !k->content_range &&
+ (data->set.httpreq==HTTPREQ_GET) &&
+ !k->ignorebody) {
+
+ if(k->size == data->state.resume_from) {
+ /* The resume point is at the end of file, consider this fine
+ even if it doesn't allow resume from here. */
+ infof(data, "The entire document is already downloaded");
+ connclose(conn, "already downloaded");
+ /* Abort download */
+ k->keepon &= ~KEEP_RECV;
+ *done = TRUE;
+ return CURLE_OK;
+ }
+
+ /* we wanted to resume a download, although the server doesn't
+ * seem to support this and we did this with a GET (if it
+ * wasn't a GET we did a POST or PUT resume) */
+ failf(data, "HTTP server doesn't seem to support "
+ "byte ranges. Cannot resume.");
+ return CURLE_RANGE_ERROR;
+ }
+
+ if(data->set.timecondition && !data->state.range) {
+ /* A time condition has been set AND no ranges have been
+ requested. This seems to be what chapter 13.3.4 of
+ RFC 2616 defines to be the correct action for a
+ HTTP/1.1 client */
+
+ if(!Curl_meets_timecondition(data, k->timeofdoc)) {
+ *done = TRUE;
+ /* We're simulating a http 304 from server so we return
+ what should have been returned from the server */
+ data->info.httpcode = 304;
+ infof(data, "Simulate a HTTP 304 response!\n");
+ /* we abort the transfer before it is completed == we ruin the
+ re-use ability. Close the connection */
+ connclose(conn, "Simulated 304 handling");
+ return CURLE_OK;
+ }
+ } /* we have a time condition */
+
+ } /* this is HTTP or RTSP */
+ } /* this is the first time we write a body part */
+#endif /* CURL_DISABLE_HTTP */
+
+ k->bodywrites++;
+
+ /* pass data to the debug function before it gets "dechunked" */
+ if(data->set.verbose) {
+ if(k->badheader) {
+ Curl_debug(data, CURLINFO_DATA_IN, data->state.headerbuff,
+ (size_t)k->hbuflen, conn);
+ if(k->badheader == HEADER_PARTHEADER)
+ Curl_debug(data, CURLINFO_DATA_IN,
+ k->str, (size_t)nread, conn);
+ }
+ else
+ Curl_debug(data, CURLINFO_DATA_IN,
+ k->str, (size_t)nread, conn);
+ }
+
+#ifndef CURL_DISABLE_HTTP
+ if(k->chunk) {
+ /*
+ * Here comes a chunked transfer flying and we need to decode this
+ * properly. While the name says read, this function both reads
+ * and writes away the data. The returned 'nread' holds the number
+ * of actual data it wrote to the client.
+ */
+
+ CHUNKcode res =
+ Curl_httpchunk_read(conn, k->str, nread, &nread);
+
+ if(CHUNKE_OK < res) {
+ if(CHUNKE_WRITE_ERROR == res) {
+ failf(data, "Failed writing data");
+ return CURLE_WRITE_ERROR;
+ }
+ failf(data, "%s in chunked-encoding", Curl_chunked_strerror(res));
+ return CURLE_RECV_ERROR;
+ }
+ else if(CHUNKE_STOP == res) {
+ size_t dataleft;
+ /* we're done reading chunks! */
+ k->keepon &= ~KEEP_RECV; /* read no more */
+
+ /* There are now possibly N number of bytes at the end of the
+ str buffer that weren't written to the client.
+
+ We DO care about this data if we are pipelining.
+ Push it back to be read on the next pass. */
+
+ dataleft = conn->chunk.dataleft;
+ if(dataleft != 0) {
+ infof(conn->data, "Leftovers after chunking: %zu bytes\n",
+ dataleft);
+ if(Curl_multi_pipeline_enabled(conn->data->multi)) {
+ /* only attempt the rewind if we truly are pipelining */
+ infof(conn->data, "Rewinding %zu bytes\n",dataleft);
+ read_rewind(conn, dataleft);
+ }
+ }
+ }
+ /* If it returned OK, we just keep going */
+ }
+#endif /* CURL_DISABLE_HTTP */
+
+ /* Account for body content stored in the header buffer */
+ if(k->badheader && !k->ignorebody) {
+ DEBUGF(infof(data, "Increasing bytecount by %zu from hbuflen\n",
+ k->hbuflen));
+ k->bytecount += k->hbuflen;
+ }
+
+ if((-1 != k->maxdownload) &&
+ (k->bytecount + nread >= k->maxdownload)) {
+
+ excess = (size_t)(k->bytecount + nread - k->maxdownload);
+ if(excess > 0 && !k->ignorebody) {
+ if(Curl_multi_pipeline_enabled(conn->data->multi)) {
+ /* The 'excess' amount below can't be more than BUFSIZE which
+ always will fit in a size_t */
+ infof(data,
+ "Rewinding stream by : %zu"
+ " bytes on url %s (size = %" CURL_FORMAT_CURL_OFF_T
+ ", maxdownload = %" CURL_FORMAT_CURL_OFF_T
+ ", bytecount = %" CURL_FORMAT_CURL_OFF_T ", nread = %zd)\n",
+ excess, data->state.path,
+ k->size, k->maxdownload, k->bytecount, nread);
+ read_rewind(conn, excess);
+ }
+ else {
+ infof(data,
+ "Excess found in a non pipelined read:"
+ " excess = %zu"
+ ", size = %" CURL_FORMAT_CURL_OFF_T
+ ", maxdownload = %" CURL_FORMAT_CURL_OFF_T
+ ", bytecount = %" CURL_FORMAT_CURL_OFF_T "\n",
+ excess, k->size, k->maxdownload, k->bytecount);
+ }
+ }
+
+ nread = (ssize_t) (k->maxdownload - k->bytecount);
+ if(nread < 0 ) /* this should be unusual */
+ nread = 0;
+
+ k->keepon &= ~KEEP_RECV; /* we're done reading */
+ }
+
+ k->bytecount += nread;
+
+ Curl_pgrsSetDownloadCounter(data, k->bytecount);
+
+ if(!k->chunk && (nread || k->badheader || is_empty_data)) {
+ /* If this is chunky transfer, it was already written */
+
+ if(k->badheader && !k->ignorebody) {
+ /* we parsed a piece of data wrongly assuming it was a header
+ and now we output it as body instead */
+
+ /* Don't let excess data pollute body writes */
+ if(k->maxdownload == -1 || (curl_off_t)k->hbuflen <= k->maxdownload)
+ result = Curl_client_write(conn, CLIENTWRITE_BODY,
+ data->state.headerbuff,
+ k->hbuflen);
+ else
+ result = Curl_client_write(conn, CLIENTWRITE_BODY,
+ data->state.headerbuff,
+ (size_t)k->maxdownload);
+
+ if(result)
+ return result;
+ }
+ if(k->badheader < HEADER_ALLBAD) {
+ /* This switch handles various content encodings. If there's an
+ error here, be sure to check over the almost identical code
+ in http_chunks.c.
+ Make sure that ALL_CONTENT_ENCODINGS contains all the
+ encodings handled here. */
+#ifdef HAVE_LIBZ
+ switch (conn->data->set.http_ce_skip ?
+ IDENTITY : k->auto_decoding) {
+ case IDENTITY:
+#endif
+ /* This is the default when the server sends no
+ Content-Encoding header. See Curl_readwrite_init; the
+ memset() call initializes k->auto_decoding to zero. */
+ if(!k->ignorebody) {
+
+#ifndef CURL_DISABLE_POP3
+ if(conn->handler->protocol&PROTO_FAMILY_POP3)
+ result = Curl_pop3_write(conn, k->str, nread);
+ else
+#endif /* CURL_DISABLE_POP3 */
+
+ result = Curl_client_write(conn, CLIENTWRITE_BODY, k->str,
+ nread);
+ }
+#ifdef HAVE_LIBZ
+ break;
+
+ case DEFLATE:
+ /* Assume CLIENTWRITE_BODY; headers are not encoded. */
+ if(!k->ignorebody)
+ result = Curl_unencode_deflate_write(conn, k, nread);
+ break;
+
+ case GZIP:
+ /* Assume CLIENTWRITE_BODY; headers are not encoded. */
+ if(!k->ignorebody)
+ result = Curl_unencode_gzip_write(conn, k, nread);
+ break;
+
+ case COMPRESS:
+ default:
+ failf (data, "Unrecognized content encoding type. "
+ "libcurl understands `identity', `deflate' and `gzip' "
+ "content encodings.");
+ result = CURLE_BAD_CONTENT_ENCODING;
+ break;
+ }
+#endif
+ }
+ k->badheader = HEADER_NORMAL; /* taken care of now */
+
+ if(result)
+ return result;
+ }
+
+ } /* if(! header and data to read ) */
+
+ if(conn->handler->readwrite &&
+ (excess > 0 && !conn->bits.stream_was_rewound)) {
+ /* Parse the excess data */
+ k->str += nread;
+ nread = (ssize_t)excess;
+
+ result = conn->handler->readwrite(data, conn, &nread, &readmore);
+ if(result)
+ return result;
+
+ if(readmore)
+ k->keepon |= KEEP_RECV; /* we're not done reading */
+ break;
+ }
+
+ if(is_empty_data) {
+ /* if we received nothing, the server closed the connection and we
+ are done */
+ k->keepon &= ~KEEP_RECV;
+ }
+
+ } while(data_pending(conn));
+
+ if(((k->keepon & (KEEP_RECV|KEEP_SEND)) == KEEP_SEND) &&
+ conn->bits.close ) {
+ /* When we've read the entire thing and the close bit is set, the server
+ may now close the connection. If there's now any kind of sending going
+ on from our side, we need to stop that immediately. */
+ infof(data, "we are done reading and this is set to close, stop send\n");
+ k->keepon &= ~KEEP_SEND; /* no writing anymore either */
+ }
+
+ return CURLE_OK;
+}
+
+/*
+ * Send data to upload to the server, when the socket is writable.
+ */
+static CURLcode readwrite_upload(struct SessionHandle *data,
+ struct connectdata *conn,
+ struct SingleRequest *k,
+ int *didwhat)
+{
+ ssize_t i, si;
+ ssize_t bytes_written;
+ CURLcode result;
+ ssize_t nread; /* number of bytes read */
+ bool sending_http_headers = FALSE;
+
+ if((k->bytecount == 0) && (k->writebytecount == 0))
+ Curl_pgrsTime(data, TIMER_STARTTRANSFER);
+
+ *didwhat |= KEEP_SEND;
+
+ /*
+ * We loop here to do the READ and SEND loop until we run out of
+ * data to send or until we get EWOULDBLOCK back
+ *
+ * FIXME: above comment is misleading. Currently no looping is
+ * actually done in do-while loop below.
+ */
+ do {
+
+ /* only read more data if there's no upload data already
+ present in the upload buffer */
+ if(0 == data->req.upload_present) {
+ /* init the "upload from here" pointer */
+ data->req.upload_fromhere = k->uploadbuf;
+
+ if(!k->upload_done) {
+ /* HTTP pollution, this should be written nicer to become more
+ protocol agnostic. */
+ int fillcount;
+ struct HTTP *http = data->req.protop;
+
+ if((k->exp100 == EXP100_SENDING_REQUEST) &&
+ (http->sending == HTTPSEND_BODY)) {
+ /* If this call is to send body data, we must take some action:
+ We have sent off the full HTTP 1.1 request, and we shall now
+ go into the Expect: 100 state and await such a header */
+ k->exp100 = EXP100_AWAITING_CONTINUE; /* wait for the header */
+ k->keepon &= ~KEEP_SEND; /* disable writing */
+ k->start100 = Curl_tvnow(); /* timeout count starts now */
+ *didwhat &= ~KEEP_SEND; /* we didn't write anything actually */
+
+ /* set a timeout for the multi interface */
+ Curl_expire(data, data->set.expect_100_timeout);
+ break;
+ }
+
+ if(conn->handler->protocol&(PROTO_FAMILY_HTTP|CURLPROTO_RTSP)) {
+ if(http->sending == HTTPSEND_REQUEST)
+ /* We're sending the HTTP request headers, not the data.
+ Remember that so we don't change the line endings. */
+ sending_http_headers = TRUE;
+ else
+ sending_http_headers = FALSE;
+ }
+
+ result = Curl_fillreadbuffer(conn, BUFSIZE, &fillcount);
+ if(result)
+ return result;
+
+ nread = (ssize_t)fillcount;
+ }
+ else
+ nread = 0; /* we're done uploading/reading */
+
+ if(!nread && (k->keepon & KEEP_SEND_PAUSE)) {
+ /* this is a paused transfer */
+ break;
+ }
+ else if(nread<=0) {
+ /* done */
+ k->keepon &= ~KEEP_SEND; /* we're done writing */
+
+ if(conn->bits.rewindaftersend) {
+ result = Curl_readrewind(conn);
+ if(result)
+ return result;
+ }
+ break;
+ }
+
+ /* store number of bytes available for upload */
+ data->req.upload_present = nread;
+
+ /* convert LF to CRLF if so asked */
+ if((!sending_http_headers) && (
+#ifdef CURL_DO_LINEEND_CONV
+ /* always convert if we're FTPing in ASCII mode */
+ (data->set.prefer_ascii) ||
+#endif
+ (data->set.crlf))) {
+ /* Do we need to allocate a scratch buffer? */
+ if(!data->state.scratch) {
+ data->state.scratch = malloc(2 * BUFSIZE);
+ if(!data->state.scratch) {
+ failf(data, "Failed to alloc scratch buffer!");
+
+ return CURLE_OUT_OF_MEMORY;
+ }
+ }
+
+ /*
+ * ASCII/EBCDIC Note: This is presumably a text (not binary)
+ * transfer so the data should already be in ASCII.
+ * That means the hex values for ASCII CR (0x0d) & LF (0x0a)
+ * must be used instead of the escape sequences \r & \n.
+ */
+ for(i = 0, si = 0; i < nread; i++, si++) {
+ if(data->req.upload_fromhere[i] == 0x0a) {
+ data->state.scratch[si++] = 0x0d;
+ data->state.scratch[si] = 0x0a;
+ if(!data->set.crlf) {
+ /* we're here only because FTP is in ASCII mode...
+ bump infilesize for the LF we just added */
+ data->state.infilesize++;
+ }
+ }
+ else
+ data->state.scratch[si] = data->req.upload_fromhere[i];
+ }
+
+ if(si != nread) {
+ /* only perform the special operation if we really did replace
+ anything */
+ nread = si;
+
+ /* upload from the new (replaced) buffer instead */
+ data->req.upload_fromhere = data->state.scratch;
+
+ /* set the new amount too */
+ data->req.upload_present = nread;
+ }
+ }
+
+#ifndef CURL_DISABLE_SMTP
+ if(conn->handler->protocol & PROTO_FAMILY_SMTP) {
+ result = Curl_smtp_escape_eob(conn, nread);
+ if(result)
+ return result;
+ }
+#endif /* CURL_DISABLE_SMTP */
+ } /* if 0 == data->req.upload_present */
+ else {
+ /* We have a partial buffer left from a previous "round". Use
+ that instead of reading more data */
+ }
+
+ /* write to socket (send away data) */
+ result = Curl_write(conn,
+ conn->writesockfd, /* socket to send to */
+ data->req.upload_fromhere, /* buffer pointer */
+ data->req.upload_present, /* buffer size */
+ &bytes_written); /* actually sent */
+
+ if(result)
+ return result;
+
+ if(data->set.verbose)
+ /* show the data before we change the pointer upload_fromhere */
+ Curl_debug(data, CURLINFO_DATA_OUT, data->req.upload_fromhere,
+ (size_t)bytes_written, conn);
+
+ k->writebytecount += bytes_written;
+
+ if(k->writebytecount == data->state.infilesize) {
+ /* we have sent all data we were supposed to */
+ k->upload_done = TRUE;
+ infof(data, "We are completely uploaded and fine\n");
+ }
+
+ if(data->req.upload_present != bytes_written) {
+ /* we only wrote a part of the buffer (if anything), deal with it! */
+
+ /* store the amount of bytes left in the buffer to write */
+ data->req.upload_present -= bytes_written;
+
+ /* advance the pointer where to find the buffer when the next send
+ is to happen */
+ data->req.upload_fromhere += bytes_written;
+ }
+ else {
+ /* we've uploaded that buffer now */
+ data->req.upload_fromhere = k->uploadbuf;
+ data->req.upload_present = 0; /* no more bytes left */
+
+ if(k->upload_done) {
+ /* switch off writing, we're done! */
+ k->keepon &= ~KEEP_SEND; /* we're done writing */
+ }
+ }
+
+ Curl_pgrsSetUploadCounter(data, k->writebytecount);
+
+ } WHILE_FALSE; /* just to break out from! */
+
+ return CURLE_OK;
+}
+
+/*
+ * Curl_readwrite() is the low-level function to be called when data is to
+ * be read and written to/from the connection.
+ */
+CURL_STATIC CURLcode Curl_readwrite(struct connectdata *conn,
+ bool *done)
+{
+ struct SessionHandle *data = conn->data;
+ struct SingleRequest *k = &data->req;
+ CURLcode result;
+ int didwhat=0;
+
+ curl_socket_t fd_read;
+ curl_socket_t fd_write;
+ int select_res = conn->cselect_bits;
+
+ conn->cselect_bits = 0;
+
+ /* only use the proper socket if the *_HOLD bit is not set simultaneously as
+ then we are in rate limiting state in that transfer direction */
+
+ if((k->keepon & KEEP_RECVBITS) == KEEP_RECV)
+ fd_read = conn->sockfd;
+ else
+ fd_read = CURL_SOCKET_BAD;
+
+ if((k->keepon & KEEP_SENDBITS) == KEEP_SEND)
+ fd_write = conn->writesockfd;
+ else
+ fd_write = CURL_SOCKET_BAD;
+
+ if(!select_res) /* Call for select()/poll() only, if read/write/error
+ status is not known. */
+ select_res = Curl_socket_ready(fd_read, fd_write, 0);
+
+ if(select_res == CURL_CSELECT_ERR) {
+ failf(data, "select/poll returned error");
+ return CURLE_SEND_ERROR;
+ }
+
+ /* We go ahead and do a read if we have a readable socket or if
+ the stream was rewound (in which case we have data in a
+ buffer) */
+ if((k->keepon & KEEP_RECV) &&
+ ((select_res & CURL_CSELECT_IN) || conn->bits.stream_was_rewound)) {
+
+ result = readwrite_data(data, conn, k, &didwhat, done);
+ if(result || *done)
+ return result;
+ }
+
+ /* If we still have writing to do, we check if we have a writable socket. */
+ if((k->keepon & KEEP_SEND) && (select_res & CURL_CSELECT_OUT)) {
+ /* write */
+
+ result = readwrite_upload(data, conn, k, &didwhat);
+ if(result)
+ return result;
+ }
+
+ k->now = Curl_tvnow();
+ if(didwhat) {
+ /* Update read/write counters */
+ if(k->bytecountp)
+ *k->bytecountp = k->bytecount; /* read count */
+ if(k->writebytecountp)
+ *k->writebytecountp = k->writebytecount; /* write count */
+ }
+ else {
+ /* no read no write, this is a timeout? */
+ if(k->exp100 == EXP100_AWAITING_CONTINUE) {
+ /* This should allow some time for the header to arrive, but only a
+ very short time as otherwise it'll be too much wasted time too
+ often. */
+
+ /* Quoting RFC2616, section "8.2.3 Use of the 100 (Continue) Status":
+
+ Therefore, when a client sends this header field to an origin server
+ (possibly via a proxy) from which it has never seen a 100 (Continue)
+ status, the client SHOULD NOT wait for an indefinite period before
+ sending the request body.
+
+ */
+
+ long ms = Curl_tvdiff(k->now, k->start100);
+ if(ms >= data->set.expect_100_timeout) {
+ /* we've waited long enough, continue anyway */
+ k->exp100 = EXP100_SEND_DATA;
+ k->keepon |= KEEP_SEND;
+ infof(data, "Done waiting for 100-continue\n");
+ }
+ }
+ }
+
+ if(Curl_pgrsUpdate(conn))
+ result = CURLE_ABORTED_BY_CALLBACK;
+ else
+ result = Curl_speedcheck(data, k->now);
+ if(result)
+ return result;
+
+ if(k->keepon) {
+ if(0 > Curl_timeleft(data, &k->now, FALSE)) {
+ if(k->size != -1) {
+ failf(data, "Operation timed out after %ld milliseconds with %"
+ CURL_FORMAT_CURL_OFF_T " out of %"
+ CURL_FORMAT_CURL_OFF_T " bytes received",
+ Curl_tvdiff(k->now, data->progress.t_startsingle), k->bytecount,
+ k->size);
+ }
+ else {
+ failf(data, "Operation timed out after %ld milliseconds with %"
+ CURL_FORMAT_CURL_OFF_T " bytes received",
+ Curl_tvdiff(k->now, data->progress.t_startsingle), k->bytecount);
+ }
+ return CURLE_OPERATION_TIMEDOUT;
+ }
+ }
+ else {
+ /*
+ * The transfer has been performed. Just make some general checks before
+ * returning.
+ */
+
+ if(!(data->set.opt_no_body) && (k->size != -1) &&
+ (k->bytecount != k->size) &&
+#ifdef CURL_DO_LINEEND_CONV
+ /* Most FTP servers don't adjust their file SIZE response for CRLFs,
+ so we'll check to see if the discrepancy can be explained
+ by the number of CRLFs we've changed to LFs.
+ */
+ (k->bytecount != (k->size + data->state.crlf_conversions)) &&
+#endif /* CURL_DO_LINEEND_CONV */
+ !data->req.newurl) {
+ failf(data, "transfer closed with %" CURL_FORMAT_CURL_OFF_T
+ " bytes remaining to read",
+ k->size - k->bytecount);
+ return CURLE_PARTIAL_FILE;
+ }
+ else if(!(data->set.opt_no_body) &&
+ k->chunk &&
+ (conn->chunk.state != CHUNK_STOP)) {
+ /*
+ * In chunked mode, return an error if the connection is closed prior to
+ * the empty (terminating) chunk is read.
+ *
+ * The condition above used to check for
+ * conn->proto.http->chunk.datasize != 0 which is true after reading
+ * *any* chunk, not just the empty chunk.
+ *
+ */
+ failf(data, "transfer closed with outstanding read data remaining");
+ return CURLE_PARTIAL_FILE;
+ }
+ if(Curl_pgrsUpdate(conn))
+ return CURLE_ABORTED_BY_CALLBACK;
+ }
+
+ /* Now update the "done" boolean we return */
+ *done = (0 == (k->keepon&(KEEP_RECV|KEEP_SEND|
+ KEEP_RECV_PAUSE|KEEP_SEND_PAUSE))) ? TRUE : FALSE;
+
+ return CURLE_OK;
+}
+
+/*
+ * Curl_single_getsock() gets called by the multi interface code when the app
+ * has requested to get the sockets for the current connection. This function
+ * will then be called once for every connection that the multi interface
+ * keeps track of. This function will only be called for connections that are
+ * in the proper state to have this information available.
+ */
+CURL_STATIC int Curl_single_getsock(const struct connectdata *conn,
+ curl_socket_t *sock, /* points to numsocks number
+ of sockets */
+ int numsocks)
+{
+ const struct SessionHandle *data = conn->data;
+ int bitmap = GETSOCK_BLANK;
+ unsigned sockindex = 0;
+
+ if(conn->handler->perform_getsock)
+ return conn->handler->perform_getsock(conn, sock, numsocks);
+
+ if(numsocks < 2)
+ /* simple check but we might need two slots */
+ return GETSOCK_BLANK;
+
+ /* don't include HOLD and PAUSE connections */
+ if((data->req.keepon & KEEP_RECVBITS) == KEEP_RECV) {
+
+ DEBUGASSERT(conn->sockfd != CURL_SOCKET_BAD);
+
+ bitmap |= GETSOCK_READSOCK(sockindex);
+ sock[sockindex] = conn->sockfd;
+ }
+
+ /* don't include HOLD and PAUSE connections */
+ if((data->req.keepon & KEEP_SENDBITS) == KEEP_SEND) {
+
+ if((conn->sockfd != conn->writesockfd) ||
+ bitmap == GETSOCK_BLANK) {
+ /* only if they are not the same socket and we have a readable
+ one, we increase index */
+ if(bitmap != GETSOCK_BLANK)
+ sockindex++; /* increase index if we need two entries */
+
+ DEBUGASSERT(conn->writesockfd != CURL_SOCKET_BAD);
+
+ sock[sockindex] = conn->writesockfd;
+ }
+
+ bitmap |= GETSOCK_WRITESOCK(sockindex);
+ }
+
+ return bitmap;
+}
+
+/*
+ * Determine optimum sleep time based on configured rate, current rate,
+ * and packet size.
+ * Returns value in milliseconds.
+ *
+ * The basic idea is to adjust the desired rate up/down in this method
+ * based on whether we are running too slow or too fast. Then, calculate
+ * how many milliseconds to wait for the next packet to achieve this new
+ * rate.
+ */
+CURL_STATIC long Curl_sleep_time(curl_off_t rate_bps, curl_off_t cur_rate_bps,
+ int pkt_size)
+{
+ curl_off_t min_sleep = 0;
+ curl_off_t rv = 0;
+
+ if(rate_bps == 0)
+ return 0;
+
+ /* If running faster than about .1% of the desired speed, slow
+ * us down a bit. Use shift instead of division as the 0.1%
+ * cutoff is arbitrary anyway.
+ */
+ if(cur_rate_bps > (rate_bps + (rate_bps >> 10))) {
+ /* running too fast, decrease target rate by 1/64th of rate */
+ rate_bps -= rate_bps >> 6;
+ min_sleep = 1;
+ }
+ else if(cur_rate_bps < (rate_bps - (rate_bps >> 10))) {
+ /* running too slow, increase target rate by 1/64th of rate */
+ rate_bps += rate_bps >> 6;
+ }
+
+ /* Determine number of milliseconds to wait until we do
+ * the next packet at the adjusted rate. We should wait
+ * longer when using larger packets, for instance.
+ */
+ rv = ((curl_off_t)(pkt_size * 1000) / rate_bps);
+
+ /* Catch rounding errors and always slow down at least 1ms if
+ * we are running too fast.
+ */
+ if(rv < min_sleep)
+ rv = min_sleep;
+
+ /* Bound value to fit in 'long' on 32-bit platform. That's
+ * plenty long enough anyway!
+ */
+ if(rv > 0x7fffffff)
+ rv = 0x7fffffff;
+
+ return (long)rv;
+}
+
+/*
+ * Curl_pretransfer() is called immediately before a transfer starts.
+ */
+CURL_STATIC CURLcode Curl_pretransfer(struct SessionHandle *data)
+{
+ CURLcode result;
+ if(!data->change.url) {
+ /* we can't do anything without URL */
+ failf(data, "No URL set!");
+ return CURLE_URL_MALFORMAT;
+ }
+
+ /* Init the SSL session ID cache here. We do it here since we want to do it
+ after the *_setopt() calls (that could specify the size of the cache) but
+ before any transfer takes place. */
+ result = Curl_ssl_initsessions(data, data->set.ssl.max_ssl_sessions);
+ if(result)
+ return result;
+
+ data->set.followlocation=0; /* reset the location-follow counter */
+ data->state.this_is_a_follow = FALSE; /* reset this */
+ data->state.errorbuf = FALSE; /* no error has occurred */
+ data->state.httpversion = 0; /* don't assume any particular server version */
+
+ data->state.authproblem = FALSE;
+ data->state.authhost.want = data->set.httpauth;
+ data->state.authproxy.want = data->set.proxyauth;
+ Curl_safefree(data->info.wouldredirect);
+ data->info.wouldredirect = NULL;
+
+ /* If there is a list of cookie files to read, do it now! */
+ if(data->change.cookielist)
+ Curl_cookie_loadfiles(data);
+
+ /* If there is a list of host pairs to deal with */
+ if(data->change.resolve)
+ result = Curl_loadhostpairs(data);
+
+ if(!result) {
+ /* Allow data->set.use_port to set which port to use. This needs to be
+ * disabled for example when we follow Location: headers to URLs using
+ * different ports! */
+ data->state.allow_port = TRUE;
+
+#if defined(HAVE_SIGNAL) && defined(SIGPIPE) && !defined(HAVE_MSG_NOSIGNAL)
+ /*************************************************************
+ * Tell signal handler to ignore SIGPIPE
+ *************************************************************/
+ if(!data->set.no_signal)
+ data->state.prev_signal = signal(SIGPIPE, SIG_IGN);
+#endif
+
+ Curl_initinfo(data); /* reset session-specific information "variables" */
+ Curl_pgrsResetTimesSizes(data);
+ Curl_pgrsStartNow(data);
+
+ if(data->set.timeout)
+ Curl_expire(data, data->set.timeout);
+
+ if(data->set.connecttimeout)
+ Curl_expire(data, data->set.connecttimeout);
+
+ /* In case the handle is re-used and an authentication method was picked
+ in the session we need to make sure we only use the one(s) we now
+ consider to be fine */
+ data->state.authhost.picked &= data->state.authhost.want;
+ data->state.authproxy.picked &= data->state.authproxy.want;
+ }
+
+ return result;
+}
+
+/*
+ * Curl_posttransfer() is called immediately after a transfer ends
+ */
+CURL_STATIC CURLcode Curl_posttransfer(struct SessionHandle *data)
+{
+#if defined(HAVE_SIGNAL) && defined(SIGPIPE) && !defined(HAVE_MSG_NOSIGNAL)
+ /* restore the signal handler for SIGPIPE before we get back */
+ if(!data->set.no_signal)
+ signal(SIGPIPE, data->state.prev_signal);
+#else
+ (void)data; /* unused parameter */
+#endif
+
+ return CURLE_OK;
+}
+
+#ifndef CURL_DISABLE_HTTP
+/*
+ * strlen_url() returns the length of the given URL if the spaces within the
+ * URL were properly URL encoded.
+ */
+static size_t strlen_url(const char *url)
+{
+ const char *ptr;
+ size_t newlen=0;
+ bool left=TRUE; /* left side of the ? */
+
+ for(ptr=url; *ptr; ptr++) {
+ switch(*ptr) {
+ case '?':
+ left=FALSE;
+ /* fall through */
+ default:
+ newlen++;
+ break;
+ case ' ':
+ if(left)
+ newlen+=3;
+ else
+ newlen++;
+ break;
+ }
+ }
+ return newlen;
+}
+
+/* strcpy_url() copies a url to a output buffer and URL-encodes the spaces in
+ * the source URL accordingly.
+ */
+static void strcpy_url(char *output, const char *url)
+{
+ /* we must add this with whitespace-replacing */
+ bool left=TRUE;
+ const char *iptr;
+ char *optr = output;
+ for(iptr = url; /* read from here */
+ *iptr; /* until zero byte */
+ iptr++) {
+ switch(*iptr) {
+ case '?':
+ left=FALSE;
+ /* fall through */
+ default:
+ *optr++=*iptr;
+ break;
+ case ' ':
+ if(left) {
+ *optr++='%'; /* add a '%' */
+ *optr++='2'; /* add a '2' */
+ *optr++='0'; /* add a '0' */
+ }
+ else
+ *optr++='+'; /* add a '+' here */
+ break;
+ }
+ }
+ *optr=0; /* zero terminate output buffer */
+
+}
+
+/*
+ * Returns true if the given URL is absolute (as opposed to relative)
+ */
+static bool is_absolute_url(const char *url)
+{
+ char prot[16]; /* URL protocol string storage */
+ char letter; /* used for a silly sscanf */
+
+ return (2 == sscanf(url, "%15[^?&/:]://%c", prot, &letter)) ? TRUE : FALSE;
+}
+
+/*
+ * Concatenate a relative URL to a base URL making it absolute.
+ * URL-encodes any spaces.
+ * The returned pointer must be freed by the caller unless NULL
+ * (returns NULL on out of memory).
+ */
+static char *concat_url(const char *base, const char *relurl)
+{
+ /***
+ TRY to append this new path to the old URL
+ to the right of the host part. Oh crap, this is doomed to cause
+ problems in the future...
+ */
+ char *newest;
+ char *protsep;
+ char *pathsep;
+ size_t newlen;
+
+ const char *useurl = relurl;
+ size_t urllen;
+
+ /* we must make our own copy of the URL to play with, as it may
+ point to read-only data */
+ char *url_clone=strdup(base);
+
+ if(!url_clone)
+ return NULL; /* skip out of this NOW */
+
+ /* protsep points to the start of the host name */
+ protsep=strstr(url_clone, "//");
+ if(!protsep)
+ protsep=url_clone;
+ else
+ protsep+=2; /* pass the slashes */
+
+ if('/' != relurl[0]) {
+ int level=0;
+
+ /* First we need to find out if there's a ?-letter in the URL,
+ and cut it and the right-side of that off */
+ pathsep = strchr(protsep, '?');
+ if(pathsep)
+ *pathsep=0;
+
+ /* we have a relative path to append to the last slash if there's one
+ available, or if the new URL is just a query string (starts with a
+ '?') we append the new one at the end of the entire currently worked
+ out URL */
+ if(useurl[0] != '?') {
+ pathsep = strrchr(protsep, '/');
+ if(pathsep)
+ *pathsep=0;
+ }
+
+ /* Check if there's any slash after the host name, and if so, remember
+ that position instead */
+ pathsep = strchr(protsep, '/');
+ if(pathsep)
+ protsep = pathsep+1;
+ else
+ protsep = NULL;
+
+ /* now deal with one "./" or any amount of "../" in the newurl
+ and act accordingly */
+
+ if((useurl[0] == '.') && (useurl[1] == '/'))
+ useurl+=2; /* just skip the "./" */
+
+ while((useurl[0] == '.') &&
+ (useurl[1] == '.') &&
+ (useurl[2] == '/')) {
+ level++;
+ useurl+=3; /* pass the "../" */
+ }
+
+ if(protsep) {
+ while(level--) {
+ /* cut off one more level from the right of the original URL */
+ pathsep = strrchr(protsep, '/');
+ if(pathsep)
+ *pathsep=0;
+ else {
+ *protsep=0;
+ break;
+ }
+ }
+ }
+ }
+ else {
+ /* We got a new absolute path for this server */
+
+ if((relurl[0] == '/') && (relurl[1] == '/')) {
+ /* the new URL starts with //, just keep the protocol part from the
+ original one */
+ *protsep=0;
+ useurl = &relurl[2]; /* we keep the slashes from the original, so we
+ skip the new ones */
+ }
+ else {
+ /* cut off the original URL from the first slash, or deal with URLs
+ without slash */
+ pathsep = strchr(protsep, '/');
+ if(pathsep) {
+ /* When people use badly formatted URLs, such as
+ "http://www.url.com?dir=/home/daniel" we must not use the first
+ slash, if there's a ?-letter before it! */
+ char *sep = strchr(protsep, '?');
+ if(sep && (sep < pathsep))
+ pathsep = sep;
+ *pathsep=0;
+ }
+ else {
+ /* There was no slash. Now, since we might be operating on a badly
+ formatted URL, such as "http://www.url.com?id=2380" which doesn't
+ use a slash separator as it is supposed to, we need to check for a
+ ?-letter as well! */
+ pathsep = strchr(protsep, '?');
+ if(pathsep)
+ *pathsep=0;
+ }
+ }
+ }
+
+ /* If the new part contains a space, this is a mighty stupid redirect
+ but we still make an effort to do "right". To the left of a '?'
+ letter we replace each space with %20 while it is replaced with '+'
+ on the right side of the '?' letter.
+ */
+ newlen = strlen_url(useurl);
+
+ urllen = strlen(url_clone);
+
+ newest = malloc(urllen + 1 + /* possible slash */
+ newlen + 1 /* zero byte */);
+
+ if(!newest) {
+ free(url_clone); /* don't leak this */
+ return NULL;
+ }
+
+ /* copy over the root url part */
+ memcpy(newest, url_clone, urllen);
+
+ /* check if we need to append a slash */
+ if(('/' == useurl[0]) || (protsep && !*protsep) || ('?' == useurl[0]))
+ ;
+ else
+ newest[urllen++]='/';
+
+ /* then append the new piece on the right side */
+ strcpy_url(&newest[urllen], useurl);
+
+ free(url_clone);
+
+ return newest;
+}
+#endif /* CURL_DISABLE_HTTP */
+
+/*
+ * Curl_follow() handles the URL redirect magic. Pass in the 'newurl' string
+ * as given by the remote server and set up the new URL to request.
+ */
+CURLcode Curl_follow(struct SessionHandle *data,
+ char *newurl, /* this 'newurl' is the Location: string,
+ and it must be malloc()ed before passed
+ here */
+ followtype type) /* see transfer.h */
+{
+#ifdef CURL_DISABLE_HTTP
+ (void)data;
+ (void)newurl;
+ (void)type;
+ /* Location: following will not happen when HTTP is disabled */
+ return CURLE_TOO_MANY_REDIRECTS;
+#else
+
+ /* Location: redirect */
+ bool disallowport = FALSE;
+
+ if(type == FOLLOW_REDIR) {
+ if((data->set.maxredirs != -1) &&
+ (data->set.followlocation >= data->set.maxredirs)) {
+ failf(data, "Maximum (%ld) redirects followed", data->set.maxredirs);
+ return CURLE_TOO_MANY_REDIRECTS;
+ }
+
+ /* mark the next request as a followed location: */
+ data->state.this_is_a_follow = TRUE;
+
+ data->set.followlocation++; /* count location-followers */
+
+ if(data->set.http_auto_referer) {
+ /* We are asked to automatically set the previous URL as the referer
+ when we get the next URL. We pick the ->url field, which may or may
+ not be 100% correct */
+
+ if(data->change.referer_alloc) {
+ Curl_safefree(data->change.referer);
+ data->change.referer_alloc = FALSE;
+ }
+
+ data->change.referer = strdup(data->change.url);
+ if(!data->change.referer)
+ return CURLE_OUT_OF_MEMORY;
+ data->change.referer_alloc = TRUE; /* yes, free this later */
+ }
+ }
+
+ if(!is_absolute_url(newurl)) {
+ /***
+ *DANG* this is an RFC 2068 violation. The URL is supposed
+ to be absolute and this doesn't seem to be that!
+ */
+ char *absolute = concat_url(data->change.url, newurl);
+ if(!absolute)
+ return CURLE_OUT_OF_MEMORY;
+ free(newurl);
+ newurl = absolute;
+ }
+ else {
+ /* This is an absolute URL, don't allow the custom port number */
+ disallowport = TRUE;
+
+ if(strchr(newurl, ' ')) {
+ /* This new URL contains at least one space, this is a mighty stupid
+ redirect but we still make an effort to do "right". */
+ char *newest;
+ size_t newlen = strlen_url(newurl);
+
+ newest = malloc(newlen+1); /* get memory for this */
+ if(!newest)
+ return CURLE_OUT_OF_MEMORY;
+ strcpy_url(newest, newurl); /* create a space-free URL */
+
+ free(newurl); /* that was no good */
+ newurl = newest; /* use this instead now */
+ }
+
+ }
+
+ if(type == FOLLOW_FAKE) {
+ /* we're only figuring out the new url if we would've followed locations
+ but now we're done so we can get out! */
+ data->info.wouldredirect = newurl;
+ return CURLE_OK;
+ }
+
+ if(disallowport)
+ data->state.allow_port = FALSE;
+
+ if(data->change.url_alloc) {
+ Curl_safefree(data->change.url);
+ data->change.url_alloc = FALSE;
+ }
+
+ data->change.url = newurl;
+ data->change.url_alloc = TRUE;
+ newurl = NULL; /* don't free! */
+
+ infof(data, "Issue another request to this URL: '%s'\n", data->change.url);
+
+ /*
+ * We get here when the HTTP code is 300-399 (and 401). We need to perform
+ * differently based on exactly what return code there was.
+ *
+ * News from 7.10.6: we can also get here on a 401 or 407, in case we act on
+ * a HTTP (proxy-) authentication scheme other than Basic.
+ */
+ switch(data->info.httpcode) {
+ /* 401 - Act on a WWW-Authenticate, we keep on moving and do the
+ Authorization: XXXX header in the HTTP request code snippet */
+ /* 407 - Act on a Proxy-Authenticate, we keep on moving and do the
+ Proxy-Authorization: XXXX header in the HTTP request code snippet */
+ /* 300 - Multiple Choices */
+ /* 306 - Not used */
+ /* 307 - Temporary Redirect */
+ default: /* for all above (and the unknown ones) */
+ /* Some codes are explicitly mentioned since I've checked RFC2616 and they
+ * seem to be OK to POST to.
+ */
+ break;
+ case 301: /* Moved Permanently */
+ /* (quote from RFC7231, section 6.4.2)
+ *
+ * Note: For historical reasons, a user agent MAY change the request
+ * method from POST to GET for the subsequent request. If this
+ * behavior is undesired, the 307 (Temporary Redirect) status code
+ * can be used instead.
+ *
+ * ----
+ *
+ * Many webservers expect this, so these servers often answers to a POST
+ * request with an error page. To be sure that libcurl gets the page that
+ * most user agents would get, libcurl has to force GET.
+ *
+ * This behaviour is forbidden by RFC1945 and the obsolete RFC2616, and
+ * can be overridden with CURLOPT_POSTREDIR.
+ */
+ if((data->set.httpreq == HTTPREQ_POST
+ || data->set.httpreq == HTTPREQ_POST_FORM)
+ && !(data->set.keep_post & CURL_REDIR_POST_301)) {
+ infof(data, "Switch from POST to GET\n");
+ data->set.httpreq = HTTPREQ_GET;
+ }
+ break;
+ case 302: /* Found */
+ /* (quote from RFC7231, section 6.4.3)
+ *
+ * Note: For historical reasons, a user agent MAY change the request
+ * method from POST to GET for the subsequent request. If this
+ * behavior is undesired, the 307 (Temporary Redirect) status code
+ * can be used instead.
+ *
+ * ----
+ *
+ * Many webservers expect this, so these servers often answers to a POST
+ * request with an error page. To be sure that libcurl gets the page that
+ * most user agents would get, libcurl has to force GET.
+ *
+ * This behaviour is forbidden by RFC1945 and the obsolete RFC2616, and
+ * can be overridden with CURLOPT_POSTREDIR.
+ */
+ if((data->set.httpreq == HTTPREQ_POST
+ || data->set.httpreq == HTTPREQ_POST_FORM)
+ && !(data->set.keep_post & CURL_REDIR_POST_302)) {
+ infof(data, "Switch from POST to GET\n");
+ data->set.httpreq = HTTPREQ_GET;
+ }
+ break;
+
+ case 303: /* See Other */
+ /* Disable both types of POSTs, unless the user explicitely
+ asks for POST after POST */
+ if(data->set.httpreq != HTTPREQ_GET
+ && !(data->set.keep_post & CURL_REDIR_POST_303)) {
+ data->set.httpreq = HTTPREQ_GET; /* enforce GET request */
+ infof(data, "Disables POST, goes with %s\n",
+ data->set.opt_no_body?"HEAD":"GET");
+ }
+ break;
+ case 304: /* Not Modified */
+ /* 304 means we did a conditional request and it was "Not modified".
+ * We shouldn't get any Location: header in this response!
+ */
+ break;
+ case 305: /* Use Proxy */
+ /* (quote from RFC2616, section 10.3.6):
+ * "The requested resource MUST be accessed through the proxy given
+ * by the Location field. The Location field gives the URI of the
+ * proxy. The recipient is expected to repeat this single request
+ * via the proxy. 305 responses MUST only be generated by origin
+ * servers."
+ */
+ break;
+ }
+ Curl_pgrsTime(data, TIMER_REDIRECT);
+ Curl_pgrsResetTimesSizes(data);
+
+ return CURLE_OK;
+#endif /* CURL_DISABLE_HTTP */
+}
+
+CURL_STATIC CURLcode
+Curl_reconnect_request(struct connectdata **connp)
+{
+ CURLcode result = CURLE_OK;
+ struct connectdata *conn = *connp;
+ struct SessionHandle *data = conn->data;
+
+ /* This was a re-use of a connection and we got a write error in the
+ * DO-phase. Then we DISCONNECT this connection and have another attempt to
+ * CONNECT and then DO again! The retry cannot possibly find another
+ * connection to re-use, since we only keep one possible connection for
+ * each. */
+
+ infof(data, "Re-used connection seems dead, get a new one\n");
+
+ connclose(conn, "Reconnect dead connection"); /* enforce close */
+ result = Curl_done(&conn, result, FALSE); /* we are so done with this */
+
+ /* conn may no longer be a good pointer, clear it to avoid mistakes by
+ parent functions */
+ *connp = NULL;
+
+ /*
+ * According to bug report #1330310. We need to check for CURLE_SEND_ERROR
+ * here as well. I figure this could happen when the request failed on a FTP
+ * connection and thus Curl_done() itself tried to use the connection
+ * (again). Slight Lack of feedback in the report, but I don't think this
+ * extra check can do much harm.
+ */
+ if(!result || (CURLE_SEND_ERROR == result)) {
+ bool async;
+ bool protocol_done = TRUE;
+
+ /* Now, redo the connect and get a new connection */
+ result = Curl_connect(data, connp, &async, &protocol_done);
+ if(!result) {
+ /* We have connected or sent away a name resolve query fine */
+
+ conn = *connp; /* setup conn to again point to something nice */
+ if(async) {
+ /* Now, if async is TRUE here, we need to wait for the name
+ to resolve */
+ result = Curl_resolver_wait_resolv(conn, NULL);
+ if(result)
+ return result;
+
+ /* Resolved, continue with the connection */
+ result = Curl_async_resolved(conn, &protocol_done);
+ if(result)
+ return result;
+ }
+ }
+ }
+
+ return result;
+}
+
+/* Returns CURLE_OK *and* sets '*url' if a request retry is wanted.
+
+ NOTE: that the *url is malloc()ed. */
+CURL_STATIC CURLcode Curl_retry_request(struct connectdata *conn,
+ char **url)
+{
+ struct SessionHandle *data = conn->data;
+
+ *url = NULL;
+
+ /* if we're talking upload, we can't do the checks below, unless the protocol
+ is HTTP as when uploading over HTTP we will still get a response */
+ if(data->set.upload &&
+ !(conn->handler->protocol&(PROTO_FAMILY_HTTP|CURLPROTO_RTSP)))
+ return CURLE_OK;
+
+ if((data->req.bytecount + data->req.headerbytecount == 0) &&
+ conn->bits.reuse &&
+ !data->set.opt_no_body &&
+ (data->set.rtspreq != RTSPREQ_RECEIVE)) {
+ /* We got no data, we attempted to re-use a connection and yet we want a
+ "body". This might happen if the connection was left alive when we were
+ done using it before, but that was closed when we wanted to read from
+ it again. Bad luck. Retry the same request on a fresh connect! */
+ infof(conn->data, "Connection died, retrying a fresh connect\n");
+ *url = strdup(conn->data->change.url);
+ if(!*url)
+ return CURLE_OUT_OF_MEMORY;
+
+ connclose(conn, "retry"); /* close this connection */
+ conn->bits.retry = TRUE; /* mark this as a connection we're about
+ to retry. Marking it this way should
+ prevent i.e HTTP transfers to return
+ error just because nothing has been
+ transferred! */
+
+
+ if(conn->handler->protocol&PROTO_FAMILY_HTTP) {
+ struct HTTP *http = data->req.protop;
+ if(http->writebytecount)
+ return Curl_readrewind(conn);
+ }
+ }
+ return CURLE_OK;
+}
+
+/*
+ * Curl_setup_transfer() is called to setup some basic properties for the
+ * upcoming transfer.
+ */
+CURL_STATIC void
+Curl_setup_transfer(
+ struct connectdata *conn, /* connection data */
+ int sockindex, /* socket index to read from or -1 */
+ curl_off_t size, /* -1 if unknown at this point */
+ bool getheader, /* TRUE if header parsing is wanted */
+ curl_off_t *bytecountp, /* return number of bytes read or NULL */
+ int writesockindex, /* socket index to write to, it may very well be
+ the same we read from. -1 disables */
+ curl_off_t *writecountp /* return number of bytes written or NULL */
+ )
+{
+ struct SessionHandle *data;
+ struct SingleRequest *k;
+
+ DEBUGASSERT(conn != NULL);
+
+ data = conn->data;
+ k = &data->req;
+
+ DEBUGASSERT((sockindex <= 1) && (sockindex >= -1));
+
+ /* now copy all input parameters */
+ conn->sockfd = sockindex == -1 ?
+ CURL_SOCKET_BAD : conn->sock[sockindex];
+ conn->writesockfd = writesockindex == -1 ?
+ CURL_SOCKET_BAD:conn->sock[writesockindex];
+ k->getheader = getheader;
+
+ k->size = size;
+ k->bytecountp = bytecountp;
+ k->writebytecountp = writecountp;
+
+ /* The code sequence below is placed in this function just because all
+ necessary input is not always known in do_complete() as this function may
+ be called after that */
+
+ if(!k->getheader) {
+ k->header = FALSE;
+ if(size > 0)
+ Curl_pgrsSetDownloadSize(data, size);
+ }
+ /* we want header and/or body, if neither then don't do this! */
+ if(k->getheader || !data->set.opt_no_body) {
+
+ if(conn->sockfd != CURL_SOCKET_BAD)
+ k->keepon |= KEEP_RECV;
+
+ if(conn->writesockfd != CURL_SOCKET_BAD) {
+ struct HTTP *http = data->req.protop;
+ /* HTTP 1.1 magic:
+
+ Even if we require a 100-return code before uploading data, we might
+ need to write data before that since the REQUEST may not have been
+ finished sent off just yet.
+
+ Thus, we must check if the request has been sent before we set the
+ state info where we wait for the 100-return code
+ */
+ if((data->state.expect100header) &&
+ (conn->handler->protocol&PROTO_FAMILY_HTTP) &&
+ (http->sending == HTTPSEND_BODY)) {
+ /* wait with write until we either got 100-continue or a timeout */
+ k->exp100 = EXP100_AWAITING_CONTINUE;
+ k->start100 = Curl_tvnow();
+
+ /* Set a timeout for the multi interface. Add the inaccuracy margin so
+ that we don't fire slightly too early and get denied to run. */
+ Curl_expire(data, data->set.expect_100_timeout);
+ }
+ else {
+ if(data->state.expect100header)
+ /* when we've sent off the rest of the headers, we must await a
+ 100-continue but first finish sending the request */
+ k->exp100 = EXP100_SENDING_REQUEST;
+
+ /* enable the write bit when we're not waiting for continue */
+ k->keepon |= KEEP_SEND;
+ }
+ } /* if(conn->writesockfd != CURL_SOCKET_BAD) */
+ } /* if(k->getheader || !data->set.opt_no_body) */
+
+}
|