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/* export_object.c
* Common routines for tracking & saving objects found in streams of data
* Copyright 2007, Stephen Fisher (see AUTHORS file)
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include "config.h"
#include <string.h>
#include <errno.h>
#include <glib.h>
#include <epan/packet_info.h>
#include <epan/tap.h>
#include <wiretap/wtap.h>
#include <wsutil/file_util.h>
#include <ui/alert_box.h>
#include "export_object.h"
gboolean
eo_save_entry(const gchar *save_as_filename, export_object_entry_t *entry, gboolean show_err)
{
int to_fd;
gint64 bytes_left;
int bytes_to_write;
ssize_t bytes_written;
guint8 *ptr;
int err;
to_fd = ws_open(save_as_filename, O_WRONLY | O_CREAT | O_EXCL |
O_BINARY, 0644);
if(to_fd == -1) { /* An error occurred */
if (show_err)
open_failure_alert_box(save_as_filename, errno, TRUE);
return FALSE;
}
/*
* The third argument to _write() on Windows is an unsigned int,
* so, on Windows, that's the size of the third argument to
* ws_write().
*
* The third argument to write() on UN*X is a size_t, although
* the return value is an ssize_t, so one probably shouldn't
* write more than the max value of an ssize_t.
*
* In either case, there's no guarantee that a gint64 such as
* payload_len can be passed to ws_write(), so we write in
* chunks of, at most 2^31 bytes.
*/
ptr = entry->payload_data;
bytes_left = entry->payload_len;
while (bytes_left != 0) {
if (bytes_left > 0x40000000)
bytes_to_write = 0x40000000;
else
bytes_to_write = (int)bytes_left;
bytes_written = ws_write(to_fd, ptr, bytes_to_write);
if(bytes_written <= 0) {
if (bytes_written < 0)
err = errno;
else
err = WTAP_ERR_SHORT_WRITE;
if (show_err)
write_failure_alert_box(save_as_filename, err);
ws_close(to_fd);
return FALSE;
}
bytes_left -= bytes_written;
ptr += bytes_written;
}
if (ws_close(to_fd) < 0) {
if (show_err)
write_failure_alert_box(save_as_filename, errno);
return FALSE;
}
return TRUE;
}
#define HINIBBLE(x) (((x) >> 4) & 0xf)
#define LONIBBLE(x) ((x) & 0xf)
#define HEXTOASCII(x) (((x) < 10) ? ((x) + '0') : ((x) - 10 + 'a'))
#define MAXFILELEN 255
static GString *eo_rename(GString *gstr, int dupn)
{
GString *gstr_tmp;
gchar *tmp_ptr;
GString *ext_str;
gstr_tmp = g_string_new("(");
g_string_append_printf (gstr_tmp, "%d)", dupn);
if ( (tmp_ptr = strrchr(gstr->str, '.')) != NULL ) {
/* Retain the extension */
ext_str = g_string_new(tmp_ptr);
gstr = g_string_truncate(gstr, gstr->len - ext_str->len);
if ( gstr->len >= (MAXFILELEN - (strlen(gstr_tmp->str) + ext_str->len)) )
gstr = g_string_truncate(gstr, MAXFILELEN - (strlen(gstr_tmp->str) + ext_str->len));
gstr = g_string_append(gstr, gstr_tmp->str);
gstr = g_string_append(gstr, ext_str->str);
g_string_free(ext_str, TRUE);
}
else {
if ( gstr->len >= (MAXFILELEN - strlen(gstr_tmp->str)) )
gstr = g_string_truncate(gstr, MAXFILELEN - strlen(gstr_tmp->str));
gstr = g_string_append(gstr, gstr_tmp->str);
}
g_string_free(gstr_tmp, TRUE);
return gstr;
}
GString *
eo_massage_str(const gchar *in_str, gsize maxlen, int dupn)
{
gchar *tmp_ptr;
/* The characters in "reject" come from:
* http://msdn.microsoft.com/en-us/library/aa365247%28VS.85%29.aspx.
* Add to the list as necessary for other OS's.
*/
const gchar *reject = "<>:\"/\\|?*"
"\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a"
"\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14"
"\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f";
GString *out_str;
GString *ext_str;
out_str = g_string_new("");
/* Find all disallowed characters/bytes and replace them with %xx */
while ( (tmp_ptr = strpbrk(in_str, reject)) != NULL ) {
out_str = g_string_append_len(out_str, in_str, tmp_ptr - in_str);
out_str = g_string_append_c(out_str, '%');
out_str = g_string_append_c(out_str, HEXTOASCII(HINIBBLE(*tmp_ptr)));
out_str = g_string_append_c(out_str, HEXTOASCII(LONIBBLE(*tmp_ptr)));
in_str = tmp_ptr + 1;
}
out_str = g_string_append(out_str, in_str);
if ( out_str->len > maxlen ) {
if ( (tmp_ptr = strrchr(out_str->str, '.')) != NULL ) {
/* Retain the extension */
ext_str = g_string_new(tmp_ptr);
out_str = g_string_truncate(out_str, maxlen - ext_str->len);
out_str = g_string_append(out_str, ext_str->str);
g_string_free(ext_str, TRUE);
}
else
out_str = g_string_truncate(out_str, maxlen);
}
if ( dupn != 0 )
out_str = eo_rename(out_str, dupn);
return out_str;
}
const char *
ct2ext(const char *content_type)
{
/* TODO: Map the content type string to an extension string. If no match,
* return NULL. */
return content_type;
}
void eo_free_entry(export_object_entry_t *entry)
{
g_free(entry->hostname);
g_free(entry->content_type);
g_free(entry->filename);
g_free(entry->payload_data);
g_free(entry);
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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