aboutsummaryrefslogtreecommitdiff
path: root/lib/download.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/download.c')
-rw-r--r--lib/download.c484
1 files changed, 484 insertions, 0 deletions
diff --git a/lib/download.c b/lib/download.c
new file mode 100644
index 000000000..fb0cb60ea
--- /dev/null
+++ b/lib/download.c
@@ -0,0 +1,484 @@
+/*****************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.0 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Curl.
+ *
+ * The Initial Developer of the Original Code is Daniel Stenberg.
+ *
+ * Portions created by the Initial Developer are Copyright (C) 1998.
+ * All Rights Reserved.
+ *
+ * ------------------------------------------------------------
+ * Main author:
+ * - Daniel Stenberg <Daniel.Stenberg@haxx.nu>
+ *
+ * http://curl.haxx.nu
+ *
+ * $Source$
+ * $Revision$
+ * $Date$
+ * $Author$
+ * $State$
+ * $Locker$
+ *
+ * ------------------------------------------------------------
+ ****************************************************************************/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "setup.h"
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+
+#include "urldata.h"
+#include <curl/curl.h>
+
+#ifdef __BEOS__
+#include <net/socket.h>
+#endif
+
+#ifdef WIN32
+#if !defined( __GNUC__) || defined(__MINGW32__)
+#include <winsock.h>
+#endif
+#include <time.h> /* for the time_t typedef! */
+
+#if defined(__GNUC__) && defined(TIME_WITH_SYS_TIME)
+#include <sys/time.h>
+#endif
+
+#endif
+
+#include "progress.h"
+#include "speedcheck.h"
+#include "sendf.h"
+
+#ifdef USE_ZLIB
+#include <zlib.h>
+#endif
+
+#define MAX(x,y) ((x)>(y)?(x):(y))
+
+/* --- download a stream from a socket --- */
+
+/* This newly edited version of Download() was brought to us by the friendly
+ Mark Butler <butlerm@xmission.com>. Re-indented with the indent command. */
+
+UrgError
+Download (struct UrlData *data,
+ int sockfd, /* socket to read from */
+ int size, /* -1 if unknown at this point */
+ bool getheader, /* TRUE if header parsing is wanted */
+ long *bytecountp /* return number of bytes read */
+)
+{
+ char *buf = data->buffer;
+ size_t nread;
+ int bytecount = 0;
+ long contentlength=0;
+ struct timeval start = tvnow();
+ struct timeval now = start;
+ bool header = TRUE;
+ int headerline = 0; /* counts header lines to better track the first one */
+
+ char *hbufp; /* points at *end* of header line */
+ int hbuflen = 0;
+ char *str; /* within buf */
+ char *str_start; /* within buf */
+ char *end_ptr; /* within buf */
+ char *p; /* within headerbuff */
+ bool content_range = FALSE; /* set TRUE if Content-Range: was found */
+ int offset = 0; /* possible resume offset read from the
+ Content-Range: header */
+ int code = 0; /* error code from the 'HTTP/1.? XXX' line */
+#ifdef USE_ZLIB
+ gzFile gzfile=NULL;
+#endif
+
+ /* for the low speed checks: */
+ UrgError urg;
+ time_t timeofdoc=0;
+ long bodywrites=0;
+
+ char newurl[URL_MAX_LENGTH]; /* buffer for Location: URL */
+
+ hbufp = data->headerbuff;
+
+ myalarm (0); /* switch off the alarm-style timeout */
+
+ now = tvnow();
+ start = now;
+
+ if (!getheader) {
+ header = FALSE;
+ ProgressInit (data, size);
+ }
+ {
+ fd_set readfd;
+ fd_set keepfd;
+ struct timeval interval;
+ bool keepon = TRUE;
+
+ /* timeout every X second
+ - makes a better progressmeter (i.e even when no data is read, the
+ meter can be updated and reflect reality)
+ - allows removal of the alarm() crap
+ - variable timeout is easier
+ */
+
+ FD_ZERO (&readfd); /* clear it */
+ FD_SET (sockfd, &readfd);
+
+ keepfd = readfd;
+#ifdef USE_ZLIB
+ gzfile = gzdopen(sockfd, "rb");
+#endif
+ while (keepon) {
+ readfd = keepfd; /* set this every lap in the loop */
+ interval.tv_sec = 2;
+ interval.tv_usec = 0;
+
+ switch (select (sockfd + 1, &readfd, NULL, NULL, &interval)) {
+ case -1: /* error, stop reading */
+ keepon = FALSE;
+ continue;
+ case 0: /* timeout */
+ break;
+ default: /* read! */
+#ifdef USE_SSLEAY
+ if (data->use_ssl) {
+ nread = SSL_read (data->ssl, buf, BUFSIZE - 1);
+ }
+ else {
+#endif
+#ifdef USE_ZLIB
+ nread = gzread(gzfile, buf, BUFSIZE -1 );
+#else
+ nread = sread (sockfd, buf, BUFSIZE - 1);
+#endif
+#ifdef USE_SSLEAY
+ }
+#endif /* USE_SSLEAY */
+
+ /* NULL terminate, allowing string ops to be used */
+ if (0 < (signed int) nread)
+ buf[nread] = 0;
+
+ /* if we receive 0 or less here, the server closed the connection and
+ we bail out from this! */
+ else if (0 >= (signed int) nread) {
+ keepon = FALSE;
+ break;
+ }
+
+ str = buf; /* Default buffer to use when we write the
+ buffer, it may be changed in the flow below
+ before the actual storing is done. */
+
+ /* Since this is a two-state thing, we check if we are parsing
+ headers at the moment or not. */
+
+ if (header) {
+ /* we are in parse-the-header-mode */
+
+ /* header line within buffer loop */
+ do {
+ int hbufp_index;
+
+ str_start = str; /* str_start is start of line within buf */
+
+ end_ptr = strchr (str_start, '\n');
+
+ if (!end_ptr) {
+ /* no more complete header lines within buffer */
+ /* copy what is remaining into headerbuff */
+ int str_length = (int)strlen(str);
+
+ if (hbuflen + (int)str_length >= data->headersize) {
+ char *newbuff;
+ long newsize=MAX((hbuflen+str_length)*3/2,
+ data->headersize*2);
+ hbufp_index = hbufp - data->headerbuff;
+ newbuff = (char *)realloc(data->headerbuff, newsize);
+ if(!newbuff) {
+ failf (data, "Failed to alloc memory for big header!");
+ return URG_READ_ERROR;
+ }
+ data->headersize=newsize;
+ data->headerbuff = newbuff;
+ hbufp = data->headerbuff + hbufp_index;
+ }
+ strcpy (hbufp, str);
+ hbufp += strlen (str);
+ hbuflen += strlen (str);
+ break; /* read more and try again */
+ }
+
+ str = end_ptr + 1; /* move just past new line */
+
+ if (hbuflen + (str - str_start) >= data->headersize) {
+ char *newbuff;
+ long newsize=MAX((hbuflen+(str-str_start))*3/2,
+ data->headersize*2);
+ hbufp_index = hbufp - data->headerbuff;
+ newbuff = (char *)realloc(data->headerbuff, newsize);
+ if(!newbuff) {
+ failf (data, "Failed to alloc memory for big header!");
+ return URG_READ_ERROR;
+ }
+ data->headersize= newsize;
+ data->headerbuff = newbuff;
+ hbufp = data->headerbuff + hbufp_index;
+ }
+
+ /* copy to end of line */
+ strncpy (hbufp, str_start, str - str_start);
+ hbufp += str - str_start;
+ hbuflen += str - str_start;
+ *hbufp = 0;
+
+ p = data->headerbuff;
+
+ /* we now have a full line that p points to */
+ if (('\n' == *p) || ('\r' == *p)) {
+ /* Zero-length line means end of header! */
+ if (-1 != size) /* if known */
+ size += bytecount; /* we append the already read size */
+
+
+ if ('\r' == *p)
+ p++; /* pass the \r byte */
+ if ('\n' == *p)
+ p++; /* pass the \n byte */
+
+ ProgressInit (data, size); /* init progress meter */
+ header = FALSE; /* no more header to parse! */
+
+ /* now, only output this if the header AND body are requested: */
+ if ((data->conf & (CONF_HEADER | CONF_NOBODY)) == CONF_HEADER) {
+ if((p - data->headerbuff) !=
+ data->fwrite (data->headerbuff, 1,
+ p - data->headerbuff, data->out)) {
+ failf (data, "Failed writing output");
+ return URG_WRITE_ERROR;
+ }
+ }
+ if(data->writeheader) {
+ /* obviously, the header is requested to be written to
+ this file: */
+ if((p - data->headerbuff) !=
+ fwrite (data->headerbuff, 1, p - data->headerbuff,
+ data->writeheader)) {
+ failf (data, "Failed writing output");
+ return URG_WRITE_ERROR;
+ }
+ }
+ break; /* exit header line loop */
+ }
+
+ if (!headerline++) {
+ /* This is the first header, it MUST be the error code line
+ or else we consiser this to be the body right away! */
+ if (sscanf (p, " HTTP/1.%*c %3d", &code)) {
+ /* 404 -> URL not found! */
+ if (
+ ( ((data->conf & CONF_FOLLOWLOCATION) && (code >= 400)) ||
+ !(data->conf & CONF_FOLLOWLOCATION) && (code >= 300))
+ && (data->conf & CONF_FAILONERROR)) {
+ /* If we have been told to fail hard on HTTP-errors,
+ here is the check for that: */
+ /* serious error, go home! */
+ failf (data, "The requested file was not found");
+ return URG_HTTP_NOT_FOUND;
+ }
+ }
+ else {
+ header = FALSE; /* this is not a header line */
+ break;
+ }
+ }
+ /* check for Content-Length: header lines to get size */
+ if (strnequal("Content-Length", p, 14) &&
+ sscanf (p+14, ": %ld", &contentlength))
+ size = contentlength;
+ else if (strnequal("Content-Range", p, 13) &&
+ sscanf (p+13, ": bytes %d-", &offset)) {
+ if (data->resume_from == offset) {
+ /* we asked for a resume and we got it */
+ content_range = TRUE;
+ }
+ }
+ else if(data->cookies &&
+ strnequal("Set-Cookie: ", p, 11)) {
+ cookie_add(data->cookies, TRUE, &p[12]);
+ }
+ else if(strnequal("Last-Modified:", p, strlen("Last-Modified:")) &&
+ data->timecondition) {
+ time_t secs=time(NULL);
+ timeofdoc = get_date(p+strlen("Last-Modified:"), &secs);
+ }
+ else if ((code >= 300 && code < 400) &&
+ (data->conf & CONF_FOLLOWLOCATION) &&
+ strnequal("Location", p, 8) &&
+ sscanf (p+8, ": %" URL_MAX_LENGTH_TXT "s", newurl)) {
+ /* this is the URL that the server advices us to get
+ instead */
+ data->newurl = strdup (newurl);
+ }
+
+ if (data->conf & CONF_HEADER) {
+ if(hbuflen != data->fwrite (p, 1, hbuflen, data->out)) {
+ failf (data, "Failed writing output");
+ return URG_WRITE_ERROR;
+ }
+ }
+ if(data->writeheader) {
+ /* the header is requested to be written to this file */
+ if(hbuflen != fwrite (p, 1, hbuflen, data->writeheader)) {
+ failf (data, "Failed writing output");
+ return URG_WRITE_ERROR;
+ }
+ }
+
+ /* reset hbufp pointer && hbuflen */
+ hbufp = data->headerbuff;
+ hbuflen = 0;
+ }
+ while (*str); /* header line within buffer */
+
+ /* We might have reached the end of the header part here, but
+ there might be a non-header part left in the end of the read
+ buffer. */
+
+ if (!header) {
+ /* the next token and forward is not part of
+ the header! */
+
+ /* we subtract the remaining header size from the buffer */
+ nread -= (str - buf);
+ }
+
+ } /* end if header mode */
+
+ /* 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 (str && !header && (nread > 0)) {
+
+ if(0 == bodywrites) {
+ /* These checks are only made the first time we are about to
+ write a chunk of the body */
+ if(data->conf&CONF_HTTP) {
+ /* HTTP-only checks */
+ if (data->resume_from && !content_range ) {
+ /* we wanted to resume a download, although the server doesn't
+ seem to support this */
+ failf (data, "HTTP server doesn't seem to support byte ranges. Cannot resume.");
+ return URG_HTTP_RANGE_ERROR;
+ }
+ else if (data->newurl) {
+ /* abort after the headers if "follow Location" is set */
+ infof (data, "Follow to new URL: %s\n", data->newurl);
+ return URG_OK;
+ }
+ else if(data->timecondition && !data->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((timeofdoc > 0) && (data->timevalue > 0)) {
+ switch(data->timecondition) {
+ case TIMECOND_IFMODSINCE:
+ default:
+ if(timeofdoc < data->timevalue) {
+ infof(data, "The requested document is not new enough");
+ return URG_OK;
+ }
+ break;
+ case TIMECOND_IFUNMODSINCE:
+ if(timeofdoc > data->timevalue) {
+ infof(data, "The requested document is not old enough");
+ return URG_OK;
+ }
+ break;
+ } /* switch */
+ } /* two valid time strings */
+ } /* we have a time condition */
+ } /* this is HTTP */
+ } /* this is the first time we write a body part */
+ bodywrites++;
+
+ if(data->maxdownload &&
+ (bytecount + nread > data->maxdownload)) {
+ nread = data->maxdownload - bytecount;
+ if(nread < 0 ) /* this should be unusual */
+ nread = 0;
+ keepon = FALSE; /* we're done now! */
+ }
+
+ bytecount += nread;
+
+ if (nread != data->fwrite (str, 1, nread, data->out)) {
+ failf (data, "Failed writing output");
+ return URG_WRITE_ERROR;
+ }
+
+ }
+ break;
+ }
+ now = tvnow();
+ if (!header) {
+ ProgressShow (data, bytecount, start, now, FALSE);
+ }
+ urg = speedcheck (data, now);
+ if (urg)
+ return urg;
+
+ if (data->timeout && (tvdiff (now, start) > data->timeout)) {
+ failf (data, "Operation timed out with %d out of %d bytes received",
+ bytecount, size);
+ return URG_OPERATION_TIMEOUTED;
+ }
+#ifdef MULTIDOC
+ if(contentlength && bytecount >= contentlength) {
+ /* we're done with this download, now stop it */
+ break;
+ }
+#endif
+ }
+ }
+ if(contentlength && (bytecount != contentlength)) {
+ failf(data, "transfer closed with %d bytes remaining", contentlength-bytecount);
+ return URG_PARTIAL_FILE;
+ }
+ ProgressShow (data, bytecount, start, now, TRUE);
+
+ *bytecountp = bytecount;
+
+#ifdef USE_ZLIB
+ gzclose(gzfile);
+#endif
+ return URG_OK;
+}
+
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-29 09:49:52 +0000