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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 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.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.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "tool_setup.h"
#ifdef HAVE_FCNTL_H
/* for open() */
#include <fcntl.h>
#endif
#include <sys/stat.h>
#define ENABLE_CURLX_PRINTF
/* use our own printf() functions */
#include "curlx.h"
#include "tool_cfgable.h"
#include "tool_msgs.h"
#include "tool_cb_wrt.h"
#include "tool_operate.h"
#include "memdebug.h" /* keep this as LAST include */
#ifndef O_BINARY
#define O_BINARY 0
#endif
#ifdef WIN32
#define OPENMODE S_IREAD | S_IWRITE
#else
#define OPENMODE S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH
#endif
/* create/open a local file for writing, return TRUE on success */
bool tool_create_output_file(struct OutStruct *outs,
struct OperationConfig *config)
{
struct GlobalConfig *global;
FILE *file = NULL;
char *fname = outs->filename;
char *aname = NULL;
DEBUGASSERT(outs);
DEBUGASSERT(config);
global = config->global;
if(!fname || !*fname) {
warnf(global, "Remote filename has no length");
return FALSE;
}
if(config->output_dir && outs->is_cd_filename) {
aname = aprintf("%s/%s", config->output_dir, fname);
if(!aname) {
errorf(global, "out of memory");
return FALSE;
}
fname = aname;
}
if(config->file_clobber_mode == CLOBBER_ALWAYS ||
(config->file_clobber_mode == CLOBBER_DEFAULT &&
!outs->is_cd_filename)) {
/* open file for writing */
file = fopen(fname, "wb");
}
else {
int fd;
do {
fd = open(fname, O_CREAT | O_WRONLY | O_EXCL | O_BINARY, OPENMODE);
/* Keep retrying in the hope that it isn't interrupted sometime */
} while(fd == -1 && errno == EINTR);
if(config->file_clobber_mode == CLOBBER_NEVER && fd == -1) {
int next_num = 1;
size_t len = strlen(fname);
size_t newlen = len + 13; /* nul + 1-11 digits + dot */
char *newname;
/* Guard against wraparound in new filename */
if(newlen < len) {
free(aname);
errorf(global, "overflow in filename generation");
return FALSE;
}
newname = malloc(newlen);
if(!newname) {
errorf(global, "out of memory");
free(aname);
return FALSE;
}
memcpy(newname, fname, len);
newname[len] = '.';
while(fd == -1 && /* haven't successfully opened a file */
(errno == EEXIST || errno == EISDIR) &&
/* because we keep having files that already exist */
next_num < 100 /* and we haven't reached the retry limit */ ) {
curlx_msnprintf(newname + len + 1, 12, "%d", next_num);
next_num++;
do {
fd = open(newname, O_CREAT | O_WRONLY | O_EXCL | O_BINARY, OPENMODE);
/* Keep retrying in the hope that it isn't interrupted sometime */
} while(fd == -1 && errno == EINTR);
}
outs->filename = newname; /* remember the new one */
outs->alloc_filename = TRUE;
}
/* An else statement to not overwrite existing files and not retry with
new numbered names (which would cover
config->file_clobber_mode == CLOBBER_DEFAULT && outs->is_cd_filename)
is not needed because we would have failed earlier, in the while loop
and `fd` would now be -1 */
if(fd != -1) {
file = fdopen(fd, "wb");
if(!file)
close(fd);
}
}
if(!file) {
warnf(global, "Failed to open the file %s: %s", fname,
strerror(errno));
free(aname);
return FALSE;
}
free(aname);
outs->s_isreg = TRUE;
outs->fopened = TRUE;
outs->stream = file;
outs->bytes = 0;
outs->init = 0;
return TRUE;
}
/*
** callback for CURLOPT_WRITEFUNCTION
*/
size_t tool_write_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
{
size_t rc;
struct per_transfer *per = userdata;
struct OutStruct *outs = &per->outs;
struct OperationConfig *config = per->config;
size_t bytes = sz * nmemb;
bool is_tty = config->global->isatty;
#ifdef WIN32
CONSOLE_SCREEN_BUFFER_INFO console_info;
intptr_t fhnd;
#endif
#ifdef DEBUGBUILD
{
char *tty = curlx_getenv("CURL_ISATTY");
if(tty) {
is_tty = TRUE;
curl_free(tty);
}
}
if(config->show_headers) {
if(bytes > (size_t)CURL_MAX_HTTP_HEADER) {
warnf(config->global, "Header data size exceeds single call write "
"limit");
return CURL_WRITEFUNC_ERROR;
}
}
else {
if(bytes > (size_t)CURL_MAX_WRITE_SIZE) {
warnf(config->global, "Data size exceeds single call write limit");
return CURL_WRITEFUNC_ERROR;
}
}
{
/* Some internal congruency checks on received OutStruct */
bool check_fails = FALSE;
if(outs->filename) {
/* regular file */
if(!*outs->filename)
check_fails = TRUE;
if(!outs->s_isreg)
check_fails = TRUE;
if(outs->fopened && !outs->stream)
check_fails = TRUE;
if(!outs->fopened && outs->stream)
check_fails = TRUE;
if(!outs->fopened && outs->bytes)
check_fails = TRUE;
}
else {
/* standard stream */
if(!outs->stream || outs->s_isreg || outs->fopened)
check_fails = TRUE;
if(outs->alloc_filename || outs->is_cd_filename || outs->init)
check_fails = TRUE;
}
if(check_fails) {
warnf(config->global, "Invalid output struct data for write callback");
return CURL_WRITEFUNC_ERROR;
}
}
#endif
if(!outs->stream && !tool_create_output_file(outs, per->config))
return CURL_WRITEFUNC_ERROR;
if(is_tty && (outs->bytes < 2000) && !config->terminal_binary_ok) {
/* binary output to terminal? */
if(memchr(buffer, 0, bytes)) {
warnf(config->global, "Binary output can mess up your terminal. "
"Use \"--output -\" to tell curl to output it to your terminal "
"anyway, or consider \"--output <FILE>\" to save to a file.");
config->synthetic_error = TRUE;
return CURL_WRITEFUNC_ERROR;
}
}
#ifdef WIN32
fhnd = _get_osfhandle(fileno(outs->stream));
if(isatty(fileno(outs->stream)) &&
GetConsoleScreenBufferInfo((HANDLE)fhnd, &console_info)) {
DWORD in_len = (DWORD)(sz * nmemb);
wchar_t* wc_buf;
DWORD wc_len;
/* calculate buffer size for wide characters */
wc_len = MultiByteToWideChar(CP_UTF8, 0, buffer, in_len, NULL, 0);
wc_buf = (wchar_t*) malloc(wc_len * sizeof(wchar_t));
if(!wc_buf)
return CURL_WRITEFUNC_ERROR;
/* calculate buffer size for multi-byte characters */
wc_len = MultiByteToWideChar(CP_UTF8, 0, buffer, in_len, wc_buf, wc_len);
if(!wc_len) {
free(wc_buf);
return CURL_WRITEFUNC_ERROR;
}
if(!WriteConsoleW(
(HANDLE) fhnd,
wc_buf,
wc_len,
&wc_len,
NULL)) {
free(wc_buf);
return CURL_WRITEFUNC_ERROR;
}
free(wc_buf);
rc = bytes;
}
else
#endif
rc = fwrite(buffer, sz, nmemb, outs->stream);
if(bytes == rc)
/* we added this amount of data to the output */
outs->bytes += bytes;
if(config->readbusy) {
config->readbusy = FALSE;
curl_easy_pause(per->curl, CURLPAUSE_CONT);
}
if(config->nobuffer) {
/* output buffering disabled */
int res = fflush(outs->stream);
if(res)
return CURL_WRITEFUNC_ERROR;
}
return rc;
}
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