mirror of
https://github.com/moparisthebest/curl
synced 2024-12-21 23:58:49 -05:00
485 lines
15 KiB
C
485 lines
15 KiB
C
/*****************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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* License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is Curl.
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*
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* The Initial Developer of the Original Code is Daniel Stenberg.
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*
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* Portions created by the Initial Developer are Copyright (C) 1998.
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* All Rights Reserved.
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*
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* ------------------------------------------------------------
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* Main author:
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* - Daniel Stenberg <Daniel.Stenberg@haxx.nu>
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*
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* http://curl.haxx.nu
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*
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* $Source$
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* $Revision$
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* $Date$
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* $Author$
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* $State$
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* $Locker$
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*
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* ------------------------------------------------------------
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****************************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "setup.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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#include "urldata.h"
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#include <curl/curl.h>
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#ifdef __BEOS__
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#include <net/socket.h>
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#endif
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#ifdef WIN32
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#if !defined( __GNUC__) || defined(__MINGW32__)
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#include <winsock.h>
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#endif
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#include <time.h> /* for the time_t typedef! */
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#if defined(__GNUC__) && defined(TIME_WITH_SYS_TIME)
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#include <sys/time.h>
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#endif
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#endif
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#include "progress.h"
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#include "speedcheck.h"
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#include "sendf.h"
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#ifdef USE_ZLIB
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#include <zlib.h>
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#endif
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#define MAX(x,y) ((x)>(y)?(x):(y))
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/* --- download a stream from a socket --- */
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/* This newly edited version of Download() was brought to us by the friendly
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Mark Butler <butlerm@xmission.com>. Re-indented with the indent command. */
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UrgError
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Download (struct UrlData *data,
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int sockfd, /* socket to read from */
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int size, /* -1 if unknown at this point */
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bool getheader, /* TRUE if header parsing is wanted */
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long *bytecountp /* return number of bytes read */
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)
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{
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char *buf = data->buffer;
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size_t nread;
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int bytecount = 0;
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long contentlength=0;
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struct timeval start = tvnow();
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struct timeval now = start;
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bool header = TRUE;
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int headerline = 0; /* counts header lines to better track the first one */
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char *hbufp; /* points at *end* of header line */
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int hbuflen = 0;
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char *str; /* within buf */
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char *str_start; /* within buf */
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char *end_ptr; /* within buf */
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char *p; /* within headerbuff */
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bool content_range = FALSE; /* set TRUE if Content-Range: was found */
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int offset = 0; /* possible resume offset read from the
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Content-Range: header */
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int code = 0; /* error code from the 'HTTP/1.? XXX' line */
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#ifdef USE_ZLIB
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gzFile gzfile=NULL;
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#endif
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/* for the low speed checks: */
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UrgError urg;
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time_t timeofdoc=0;
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long bodywrites=0;
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char newurl[URL_MAX_LENGTH]; /* buffer for Location: URL */
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hbufp = data->headerbuff;
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myalarm (0); /* switch off the alarm-style timeout */
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now = tvnow();
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start = now;
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if (!getheader) {
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header = FALSE;
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ProgressInit (data, size);
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}
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{
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fd_set readfd;
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fd_set keepfd;
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struct timeval interval;
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bool keepon = TRUE;
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/* timeout every X second
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- makes a better progressmeter (i.e even when no data is read, the
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meter can be updated and reflect reality)
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- allows removal of the alarm() crap
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- variable timeout is easier
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*/
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FD_ZERO (&readfd); /* clear it */
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FD_SET (sockfd, &readfd);
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keepfd = readfd;
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#ifdef USE_ZLIB
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gzfile = gzdopen(sockfd, "rb");
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#endif
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while (keepon) {
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readfd = keepfd; /* set this every lap in the loop */
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interval.tv_sec = 2;
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interval.tv_usec = 0;
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switch (select (sockfd + 1, &readfd, NULL, NULL, &interval)) {
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case -1: /* error, stop reading */
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keepon = FALSE;
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continue;
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case 0: /* timeout */
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break;
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default: /* read! */
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#ifdef USE_SSLEAY
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if (data->use_ssl) {
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nread = SSL_read (data->ssl, buf, BUFSIZE - 1);
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}
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else {
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#endif
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#ifdef USE_ZLIB
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nread = gzread(gzfile, buf, BUFSIZE -1 );
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#else
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nread = sread (sockfd, buf, BUFSIZE - 1);
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#endif
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#ifdef USE_SSLEAY
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}
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#endif /* USE_SSLEAY */
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/* NULL terminate, allowing string ops to be used */
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if (0 < (signed int) nread)
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buf[nread] = 0;
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/* if we receive 0 or less here, the server closed the connection and
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we bail out from this! */
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else if (0 >= (signed int) nread) {
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keepon = FALSE;
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break;
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}
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str = buf; /* Default buffer to use when we write the
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buffer, it may be changed in the flow below
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before the actual storing is done. */
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/* Since this is a two-state thing, we check if we are parsing
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headers at the moment or not. */
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if (header) {
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/* we are in parse-the-header-mode */
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/* header line within buffer loop */
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do {
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int hbufp_index;
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str_start = str; /* str_start is start of line within buf */
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end_ptr = strchr (str_start, '\n');
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if (!end_ptr) {
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/* no more complete header lines within buffer */
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/* copy what is remaining into headerbuff */
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int str_length = (int)strlen(str);
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if (hbuflen + (int)str_length >= data->headersize) {
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char *newbuff;
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long newsize=MAX((hbuflen+str_length)*3/2,
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data->headersize*2);
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hbufp_index = hbufp - data->headerbuff;
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newbuff = (char *)realloc(data->headerbuff, newsize);
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if(!newbuff) {
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failf (data, "Failed to alloc memory for big header!");
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return URG_READ_ERROR;
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}
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data->headersize=newsize;
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data->headerbuff = newbuff;
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hbufp = data->headerbuff + hbufp_index;
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}
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strcpy (hbufp, str);
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hbufp += strlen (str);
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hbuflen += strlen (str);
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break; /* read more and try again */
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}
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str = end_ptr + 1; /* move just past new line */
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if (hbuflen + (str - str_start) >= data->headersize) {
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char *newbuff;
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long newsize=MAX((hbuflen+(str-str_start))*3/2,
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data->headersize*2);
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hbufp_index = hbufp - data->headerbuff;
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newbuff = (char *)realloc(data->headerbuff, newsize);
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if(!newbuff) {
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failf (data, "Failed to alloc memory for big header!");
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return URG_READ_ERROR;
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}
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data->headersize= newsize;
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data->headerbuff = newbuff;
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hbufp = data->headerbuff + hbufp_index;
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}
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/* copy to end of line */
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strncpy (hbufp, str_start, str - str_start);
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hbufp += str - str_start;
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hbuflen += str - str_start;
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*hbufp = 0;
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p = data->headerbuff;
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/* we now have a full line that p points to */
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if (('\n' == *p) || ('\r' == *p)) {
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/* Zero-length line means end of header! */
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if (-1 != size) /* if known */
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size += bytecount; /* we append the already read size */
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if ('\r' == *p)
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p++; /* pass the \r byte */
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if ('\n' == *p)
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p++; /* pass the \n byte */
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ProgressInit (data, size); /* init progress meter */
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header = FALSE; /* no more header to parse! */
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/* now, only output this if the header AND body are requested: */
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if ((data->conf & (CONF_HEADER | CONF_NOBODY)) == CONF_HEADER) {
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if((p - data->headerbuff) !=
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data->fwrite (data->headerbuff, 1,
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p - data->headerbuff, data->out)) {
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failf (data, "Failed writing output");
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return URG_WRITE_ERROR;
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}
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}
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if(data->writeheader) {
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/* obviously, the header is requested to be written to
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this file: */
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if((p - data->headerbuff) !=
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fwrite (data->headerbuff, 1, p - data->headerbuff,
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data->writeheader)) {
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failf (data, "Failed writing output");
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return URG_WRITE_ERROR;
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}
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}
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break; /* exit header line loop */
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}
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if (!headerline++) {
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/* This is the first header, it MUST be the error code line
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or else we consiser this to be the body right away! */
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if (sscanf (p, " HTTP/1.%*c %3d", &code)) {
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/* 404 -> URL not found! */
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if (
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( ((data->conf & CONF_FOLLOWLOCATION) && (code >= 400)) ||
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!(data->conf & CONF_FOLLOWLOCATION) && (code >= 300))
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&& (data->conf & CONF_FAILONERROR)) {
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/* If we have been told to fail hard on HTTP-errors,
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here is the check for that: */
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/* serious error, go home! */
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failf (data, "The requested file was not found");
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return URG_HTTP_NOT_FOUND;
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}
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}
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else {
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header = FALSE; /* this is not a header line */
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break;
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}
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}
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/* check for Content-Length: header lines to get size */
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if (strnequal("Content-Length", p, 14) &&
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sscanf (p+14, ": %ld", &contentlength))
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size = contentlength;
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else if (strnequal("Content-Range", p, 13) &&
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sscanf (p+13, ": bytes %d-", &offset)) {
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if (data->resume_from == offset) {
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/* we asked for a resume and we got it */
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content_range = TRUE;
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}
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}
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else if(data->cookies &&
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strnequal("Set-Cookie: ", p, 11)) {
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cookie_add(data->cookies, TRUE, &p[12]);
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}
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else if(strnequal("Last-Modified:", p, strlen("Last-Modified:")) &&
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data->timecondition) {
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time_t secs=time(NULL);
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timeofdoc = get_date(p+strlen("Last-Modified:"), &secs);
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}
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else if ((code >= 300 && code < 400) &&
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(data->conf & CONF_FOLLOWLOCATION) &&
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strnequal("Location", p, 8) &&
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sscanf (p+8, ": %" URL_MAX_LENGTH_TXT "s", newurl)) {
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/* this is the URL that the server advices us to get
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instead */
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data->newurl = strdup (newurl);
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}
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if (data->conf & CONF_HEADER) {
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if(hbuflen != data->fwrite (p, 1, hbuflen, data->out)) {
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failf (data, "Failed writing output");
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return URG_WRITE_ERROR;
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}
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}
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if(data->writeheader) {
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/* the header is requested to be written to this file */
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if(hbuflen != fwrite (p, 1, hbuflen, data->writeheader)) {
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failf (data, "Failed writing output");
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return URG_WRITE_ERROR;
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}
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}
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/* reset hbufp pointer && hbuflen */
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hbufp = data->headerbuff;
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hbuflen = 0;
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}
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while (*str); /* header line within buffer */
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/* We might have reached the end of the header part here, but
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there might be a non-header part left in the end of the read
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buffer. */
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if (!header) {
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/* the next token and forward is not part of
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the header! */
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/* we subtract the remaining header size from the buffer */
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nread -= (str - buf);
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}
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} /* end if header mode */
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/* This is not an 'else if' since it may be a rest from the header
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parsing, where the beginning of the buffer is headers and the end
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is non-headers. */
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if (str && !header && (nread > 0)) {
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if(0 == bodywrites) {
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/* These checks are only made the first time we are about to
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write a chunk of the body */
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if(data->conf&CONF_HTTP) {
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/* HTTP-only checks */
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if (data->resume_from && !content_range ) {
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/* we wanted to resume a download, although the server doesn't
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seem to support this */
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failf (data, "HTTP server doesn't seem to support byte ranges. Cannot resume.");
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return URG_HTTP_RANGE_ERROR;
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}
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else if (data->newurl) {
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/* abort after the headers if "follow Location" is set */
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infof (data, "Follow to new URL: %s\n", data->newurl);
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return URG_OK;
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}
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else if(data->timecondition && !data->range) {
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/* A time condition has been set AND no ranges have been
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requested. This seems to be what chapter 13.3.4 of RFC 2616
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defines to be the correct action for a HTTP/1.1 client */
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if((timeofdoc > 0) && (data->timevalue > 0)) {
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switch(data->timecondition) {
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case TIMECOND_IFMODSINCE:
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default:
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if(timeofdoc < data->timevalue) {
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infof(data, "The requested document is not new enough");
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return URG_OK;
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}
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break;
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case TIMECOND_IFUNMODSINCE:
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if(timeofdoc > data->timevalue) {
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infof(data, "The requested document is not old enough");
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return URG_OK;
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}
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break;
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} /* switch */
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} /* two valid time strings */
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} /* we have a time condition */
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} /* this is HTTP */
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} /* this is the first time we write a body part */
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bodywrites++;
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if(data->maxdownload &&
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(bytecount + nread > data->maxdownload)) {
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nread = data->maxdownload - bytecount;
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if(nread < 0 ) /* this should be unusual */
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nread = 0;
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keepon = FALSE; /* we're done now! */
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}
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bytecount += nread;
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if (nread != data->fwrite (str, 1, nread, data->out)) {
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failf (data, "Failed writing output");
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return URG_WRITE_ERROR;
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}
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}
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break;
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}
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now = tvnow();
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if (!header) {
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ProgressShow (data, bytecount, start, now, FALSE);
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}
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urg = speedcheck (data, now);
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if (urg)
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return urg;
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if (data->timeout && (tvdiff (now, start) > data->timeout)) {
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failf (data, "Operation timed out with %d out of %d bytes received",
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bytecount, size);
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return URG_OPERATION_TIMEOUTED;
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}
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#ifdef MULTIDOC
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if(contentlength && bytecount >= contentlength) {
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/* we're done with this download, now stop it */
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break;
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}
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#endif
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}
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}
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if(contentlength && (bytecount != contentlength)) {
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failf(data, "transfer closed with %d bytes remaining", contentlength-bytecount);
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return URG_PARTIAL_FILE;
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}
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ProgressShow (data, bytecount, start, now, TRUE);
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*bytecountp = bytecount;
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#ifdef USE_ZLIB
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gzclose(gzfile);
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#endif
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return URG_OK;
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}
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