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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2017, 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 https://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 "tool_setup.h"
#include "strcase.h"
#define ENABLE_CURLX_PRINTF
/* use our own printf() functions */
#include "curlx.h"
#include "tool_cfgable.h"
#include "tool_doswin.h"
#include "tool_msgs.h"
#include "tool_cb_hdr.h"
#include "memdebug.h" /* keep this as LAST include */
static char *parse_filename(const char *ptr, size_t len);
/*
** callback for CURLOPT_HEADERFUNCTION
*/
size_t tool_header_cb(char *ptr, size_t size, size_t nmemb, void *userdata)
{
struct HdrCbData *hdrcbdata = userdata;
struct OutStruct *outs = hdrcbdata->outs;
struct OutStruct *heads = hdrcbdata->heads;
const char *str = ptr;
const size_t cb = size * nmemb;
const char *end = (char *)ptr + cb;
char *url = NULL;
/*
* Once that libcurl has called back tool_header_cb() the returned value
* is checked against the amount that was intended to be written, if
* it does not match then it fails with CURLE_WRITE_ERROR. So at this
* point returning a value different from sz*nmemb indicates failure.
*/
size_t failure = (size * nmemb) ? 0 : 1;
if(!heads->config)
return failure;
#ifdef DEBUGBUILD
if(size * nmemb > (size_t)CURL_MAX_HTTP_HEADER) {
warnf(heads->config->global, "Header data exceeds single call write "
"limit!\n");
return failure;
}
#endif
/*
* Write header data when curl option --dump-header (-D) is given.
*/
if(heads->config->headerfile && heads->stream) {
size_t rc = fwrite(ptr, size, nmemb, heads->stream);
if(rc != cb)
return rc;
/* flush the stream to send off what we got earlier */
(void)fflush(heads->stream);
}
/*
* This callback sets the filename where output shall be written when
* curl options --remote-name (-O) and --remote-header-name (-J) have
* been simultaneously given and additionally server returns an HTTP
* Content-Disposition header specifying a filename property.
*/
if(hdrcbdata->honor_cd_filename &&
(cb > 20) && checkprefix("Content-disposition:", str) &&
!curl_easy_getinfo(outs->config->easy, CURLINFO_EFFECTIVE_URL, &url) &&
url && (checkprefix("http://", url) || checkprefix("https://", url))) {
const char *p = str + 20;
/* look for the 'filename=' parameter
(encoded filenames (*=) are not supported) */
for(;;) {
char *filename;
size_t len;
while(*p && (p < end) && !ISALPHA(*p))
p++;
if(p > end - 9)
break;
if(memcmp(p, "filename=", 9)) {
/* no match, find next parameter */
while((p < end) && (*p != ';'))
p++;
continue;
}
p += 9;
/* this expression below typecasts 'cb' only to avoid
warning: signed and unsigned type in conditional expression
*/
len = (ssize_t)cb - (p - str);
filename = parse_filename(p, len);
if(filename) {
outs->filename = filename;
outs->alloc_filename = TRUE;
outs->is_cd_filename = TRUE;
outs->s_isreg = TRUE;
outs->fopened = FALSE;
outs->stream = NULL;
hdrcbdata->honor_cd_filename = FALSE;
break;
}
return failure;
}
}
return cb;
}
/*
* Copies a file name part and returns an ALLOCATED data buffer.
*/
static char *parse_filename(const char *ptr, size_t len)
{
char *copy;
char *p;
char *q;
char stop = '\0';
/* simple implementation of strndup() */
copy = malloc(len+1);
if(!copy)
return NULL;
memcpy(copy, ptr, len);
copy[len] = '\0';
p = copy;
if(*p == '\'' || *p == '"') {
/* store the starting quote */
stop = *p;
p++;
}
else
stop = ';';
/* if the filename contains a path, only use filename portion */
q = strrchr(copy, '/');
if(q) {
p = q + 1;
if(!*p) {
Curl_safefree(copy);
return NULL;
}
}
/* If the filename contains a backslash, only use filename portion. The idea
is that even systems that don't handle backslashes as path separators
probably want the path removed for convenience. */
q = strrchr(p, '\\');
if(q) {
p = q + 1;
if(!*p) {
Curl_safefree(copy);
return NULL;
}
}
/* scan for the end letter and stop there */
for(q = p; *q; ++q) {
if(*q == stop) {
*q = '\0';
break;
}
}
/* make sure the file name doesn't end in \r or \n */
q = strchr(p, '\r');
if(q)
*q = '\0';
q = strchr(p, '\n');
if(q)
*q = '\0';
if(copy != p)
memmove(copy, p, strlen(p) + 1);
#if defined(MSDOS) || defined(WIN32)
{
char *sanitized;
SANITIZEcode sc = sanitize_file_name(&sanitized, copy, 0);
Curl_safefree(copy);
if(sc)
return NULL;
copy = sanitized;
}
#endif /* MSDOS || WIN32 */
/* in case we built debug enabled, we allow an environment variable
* named CURL_TESTDIR to prefix the given file name to put it into a
* specific directory
*/
#ifdef DEBUGBUILD
{
char *tdir = curlx_getenv("CURL_TESTDIR");
if(tdir) {
char buffer[512]; /* suitably large */
snprintf(buffer, sizeof(buffer), "%s/%s", tdir, copy);
Curl_safefree(copy);
copy = strdup(buffer); /* clone the buffer, we don't use the libcurl
aprintf() or similar since we want to use the
same memory code as the "real" parse_filename
function */
curl_free(tdir);
}
}
#endif
return copy;
}
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