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/* packet-http-urlencoded.c
* Routines for dissection of HTTP urlecncoded form, based on packet-text-media.c (C) Olivier Biot, 2004.
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#define NEW_PROTO_TREE_API
#include "config.h"
#include <epan/packet.h>
#include <wsutil/str_util.h>
#include "packet-http.h"
void proto_register_http_urlencoded(void);
void proto_reg_handoff_http_urlencoded(void);
static dissector_handle_t form_urlencoded_handle;
static header_field_info *hfi_urlencoded = NULL;
#define URLENCODED_HFI_INIT HFI_INIT(proto_urlencoded)
static header_field_info hfi_form_key URLENCODED_HFI_INIT =
{ "Key", "urlencoded-form.key", FT_STRINGZ, BASE_NONE, NULL, 0x0, NULL, HFILL };
static header_field_info hfi_form_value URLENCODED_HFI_INIT =
{ "Value", "urlencoded-form.value", FT_STRINGZ, BASE_NONE, NULL, 0x0, NULL, HFILL };
static gint ett_form_urlencoded = -1;
static gint ett_form_keyvalue = -1;
static int
get_form_key_value(tvbuff_t *tvb, char **ptr, int offset, char stop)
{
const int orig_offset = offset;
char *tmp;
int len;
len = 0;
while (tvb_reported_length_remaining(tvb, offset) > 0) {
guint8 ch;
ch = tvb_get_guint8(tvb, offset);
if (!ch)
return -1;
if (ch == stop)
break;
if (ch == '%') {
offset++;
ch = tvb_get_guint8(tvb, offset);
if (ws_xton(ch) == -1)
return -1;
offset++;
ch = tvb_get_guint8(tvb, offset);
if (ws_xton(ch) == -1)
return -1;
}
len++;
offset++;
}
*ptr = tmp = (char*)wmem_alloc(wmem_packet_scope(), len + 1);
tmp[len] = '\0';
len = 0;
offset = orig_offset;
while (tvb_reported_length_remaining(tvb, offset) > 0) {
guint8 ch;
ch = tvb_get_guint8(tvb, offset);
if (!ch)
return -1;
if (ch == stop)
break;
if (ch == '%') {
guint8 ch1, ch2;
offset++;
ch1 = tvb_get_guint8(tvb, offset);
offset++;
ch2 = tvb_get_guint8(tvb, offset);
tmp[len] = ws_xton(ch1) << 4 | ws_xton(ch2);
} else if (ch == '+')
tmp[len] = ' ';
else
tmp[len] = ch;
len++;
offset++;
}
return offset;
}
static int
dissect_form_urlencoded(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
proto_tree *url_tree;
proto_tree *sub;
proto_item *ti;
gint offset = 0, next_offset;
const char *data_name;
http_message_info_t *message_info;
data_name = pinfo->match_string;
if (! (data_name && data_name[0])) {
/*
* No information from "match_string"
*/
message_info = (http_message_info_t *)data;
if (message_info == NULL) {
/*
* No information from dissector data
*/
data_name = NULL;
} else {
data_name = message_info->media_str;
if (! (data_name && data_name[0])) {
/*
* No information from dissector data
*/
data_name = NULL;
}
}
}
if (data_name)
col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "(%s)", data_name);
ti = proto_tree_add_item(tree, hfi_urlencoded, tvb, 0, -1, ENC_NA);
if (data_name)
proto_item_append_text(ti, ": %s", data_name);
url_tree = proto_item_add_subtree(ti, ett_form_urlencoded);
while (tvb_reported_length_remaining(tvb, offset) > 0) {
const int start_offset = offset;
char *key, *value;
sub = proto_tree_add_subtree(url_tree, tvb, offset, 0, ett_form_keyvalue, &ti, "Form item");
next_offset = get_form_key_value(tvb, &key, offset, '=');
if (next_offset == -1)
break;
proto_tree_add_string(sub, &hfi_form_key, tvb, offset, next_offset - offset, key);
proto_item_append_text(sub, ": \"%s\"", key);
offset = next_offset+1;
next_offset = get_form_key_value(tvb, &value, offset, '&');
if (next_offset == -1)
break;
proto_tree_add_string(sub, &hfi_form_value, tvb, offset, next_offset - offset, value);
proto_item_append_text(sub, " = \"%s\"", value);
offset = next_offset+1;
proto_item_set_len(ti, offset - start_offset);
}
return tvb_captured_length(tvb);
}
void
proto_register_http_urlencoded(void)
{
#ifndef HAVE_HFI_SECTION_INIT
static header_field_info *hfi[] = {
&hfi_form_key,
&hfi_form_value,
};
#endif
static gint *ett[] = {
&ett_form_urlencoded,
&ett_form_keyvalue
};
int proto_urlencoded;
proto_urlencoded = proto_register_protocol("HTML Form URL Encoded", "URL Encoded Form Data", "urlencoded-form");
hfi_urlencoded = proto_registrar_get_nth(proto_urlencoded);
form_urlencoded_handle = register_dissector("urlencoded-form", dissect_form_urlencoded, proto_urlencoded);
proto_register_fields(proto_urlencoded, hfi, array_length(hfi));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_http_urlencoded(void)
{
dissector_add_string("media_type", "application/x-www-form-urlencoded", form_urlencoded_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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