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/*
* fastcgi.c
*
* Copyright (C) 2022 - ntop.org
*
* nDPI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nDPI 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_FASTCGI
#include "ndpi_api.h"
/* Reference: http://www.mit.edu/~yandros/doc/specs/fcgi-spec.html */
PACK_ON
struct FCGI_Header {
unsigned char version;
unsigned char type;
u_int16_t requestId;
u_int16_t contentLength;
unsigned char paddingLength;
unsigned char reserved;
} PACK_OFF;
enum FCGI_Type {
FCGI_MIN = 1,
FCGI_BEGIN_REQUEST = 1,
FCGI_ABORT_REQUEST = 2,
FCGI_END_REQUEST = 3,
FCGI_PARAMS = 4,
FCGI_STDIN = 5,
FCGI_STDOUT = 6,
FCGI_STDERR = 7,
FCGI_DATA = 8,
FCGI_GET_VALUES = 9,
FCGI_GET_VALUES_RESULT = 10,
FCGI_UNKNOWN_TYPE = 11,
FCGI_MAX = 11
};
static void ndpi_int_fastcgi_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
struct ndpi_flow_struct * const flow)
{
NDPI_LOG_INFO(ndpi_struct, "found fastcgi\n");
ndpi_set_detected_protocol(ndpi_struct, flow,
NDPI_PROTOCOL_FASTCGI,
NDPI_PROTOCOL_UNKNOWN,
NDPI_CONFIDENCE_DPI);
}
void ndpi_search_fastcgi(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
struct FCGI_Header const * fcgi_hdr;
enum FCGI_Type fcgi_type;
u_int16_t content_len;
NDPI_LOG_DBG(ndpi_struct, "search fastcgi\n");
if (packet->payload_packet_len < sizeof(struct FCGI_Header))
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
fcgi_hdr = (struct FCGI_Header const *)&packet->payload[0];
if (fcgi_hdr->version != 0x01)
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
fcgi_type = (enum FCGI_Type)fcgi_hdr->type;
if (fcgi_type < FCGI_MIN || fcgi_type > FCGI_MAX)
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
content_len = ntohs(fcgi_hdr->contentLength);
if (packet->payload_packet_len != sizeof(*fcgi_hdr) + content_len + fcgi_hdr->paddingLength)
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
if (flow->packet_counter > 2)
{
ndpi_int_fastcgi_add_connection(ndpi_struct, flow);
}
}
void init_fastcgi_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("FastCGI", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_FASTCGI,
ndpi_search_fastcgi,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK
);
*id += 1;
}
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