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/* export_object.c
* GUI independent helper routines common to all export object taps.
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <string.h>
#include "proto.h"
#include "packet_info.h"
#include "export_object.h"
struct register_eo {
int proto_id; /* protocol id (0-indexed) */
const char* tap_listen_str; /* string used in register_tap_listener (NULL to use protocol name) */
tap_packet_cb eo_func; /* function to be called for new incoming packets for SRT */
export_object_gui_reset_cb reset_cb; /* function to parse parameters of optional arguments of tap string */
};
static wmem_tree_t *registered_eo_tables;
int
register_export_object(const int proto_id, tap_packet_cb export_packet_func, export_object_gui_reset_cb reset_cb)
{
register_eo_t *table;
DISSECTOR_ASSERT(export_packet_func);
table = wmem_new(wmem_epan_scope(), register_eo_t);
table->proto_id = proto_id;
table->tap_listen_str = wmem_strdup_printf(wmem_epan_scope(), "%s_eo", proto_get_protocol_filter_name(proto_id));
table->eo_func = export_packet_func;
table->reset_cb = reset_cb;
if (registered_eo_tables == NULL)
registered_eo_tables = wmem_tree_new(wmem_epan_scope());
wmem_tree_insert_string(registered_eo_tables, proto_get_protocol_filter_name(proto_id), table, 0);
return register_tap(table->tap_listen_str);
}
int get_eo_proto_id(register_eo_t* eo)
{
if (!eo) {
return -1;
}
return eo->proto_id;
}
const char* get_eo_tap_listener_name(register_eo_t* eo)
{
return eo->tap_listen_str;
}
tap_packet_cb get_eo_packet_func(register_eo_t* eo)
{
return eo->eo_func;
}
export_object_gui_reset_cb get_eo_reset_func(register_eo_t* eo)
{
return eo->reset_cb;
}
register_eo_t* get_eo_by_name(const char* name)
{
return (register_eo_t*)wmem_tree_lookup_string(registered_eo_tables, name, 0);
}
void eo_iterate_tables(wmem_foreach_func func, void *user_data)
{
wmem_tree_foreach(registered_eo_tables, func, user_data);
}
static GString *eo_rename(GString *gstr, size_t maxlen, int dupn)
{
GString *gstr_tmp;
char *tmp_ptr;
GString *ext_str = NULL;
gstr_tmp = g_string_new("");
if (dupn != 0) {
g_string_append_printf (gstr_tmp, "(%d)", dupn);
}
if ( (tmp_ptr = strrchr(gstr->str, '.')) != NULL && ((ext_str = g_string_new(tmp_ptr))->len + strlen(gstr_tmp->str) < maxlen) ) {
/* Retain the extension */
gstr = g_string_truncate(gstr, gstr->len - ext_str->len);
if ( gstr->len >= (maxlen - (strlen(gstr_tmp->str) + ext_str->len)) )
gstr = g_string_truncate(gstr, maxlen - (strlen(gstr_tmp->str) + ext_str->len));
gstr = g_string_append(gstr, gstr_tmp->str);
gstr = g_string_append(gstr, ext_str->str);
}
else {
if ( gstr->len >= (maxlen - strlen(gstr_tmp->str)) )
gstr = g_string_truncate(gstr, maxlen - strlen(gstr_tmp->str));
gstr = g_string_append(gstr, gstr_tmp->str);
}
if (ext_str) {
g_string_free(ext_str, TRUE);
}
g_string_free(gstr_tmp, TRUE);
return gstr;
}
GString *
eo_massage_str(const char *in_str, size_t maxlen, int dupn)
{
char *tmp_ptr;
/* The characters in "reject" come from:
* https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#naming-conventions.
* Add to the list as necessary for other OS's.
*/
const char *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;
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);
g_string_append_printf(out_str, "%%%02x", *tmp_ptr);
in_str = tmp_ptr + 1;
}
out_str = g_string_append(out_str, in_str);
if ( dupn != 0 || out_str->len > maxlen )
out_str = eo_rename(out_str, maxlen, dupn);
return out_str;
}
const char *
eo_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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