From 149067b3fc4f3daafaa0cb8c2a5dab376b3ae975 Mon Sep 17 00:00:00 2001 From: Vladimir Gavrilov <105977161+0xA50C1A1@users.noreply.github.com> Date: Wed, 20 Dec 2023 14:42:25 +0300 Subject: Add JSON-RPC protocol dissector (#2217) * Add JSON-RPC protocol dissector * Small fixes * Improve detection --- src/lib/protocols/json-rpc.c | 71 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 src/lib/protocols/json-rpc.c (limited to 'src/lib/protocols/json-rpc.c') diff --git a/src/lib/protocols/json-rpc.c b/src/lib/protocols/json-rpc.c new file mode 100644 index 000000000..c989fbea4 --- /dev/null +++ b/src/lib/protocols/json-rpc.c @@ -0,0 +1,71 @@ +/* + * json-rpc.c + * + * Copyright (C) 2023 - ntop.org + * Copyright (C) 2023 - V.G + * + * This file is part of nDPI, an open source deep packet inspection + * library based on the OpenDPI and PACE technology by ipoque GmbH + * + * 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 . + * + */ + +#include "ndpi_protocol_ids.h" + +#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_JSON_RPC + +#include "ndpi_api.h" +#include "ndpi_private.h" + +static void ndpi_search_json_rpc(struct ndpi_detection_module_struct *ndpi_struct, + struct ndpi_flow_struct *flow) +{ + struct ndpi_packet_struct const * const packet = &ndpi_struct->packet; + + if (flow->detected_protocol_stack[0] == NDPI_PROTOCOL_HTTP || + flow->detected_protocol_stack[1] == NDPI_PROTOCOL_HTTP) + { + if ((packet->content_line.ptr != NULL) && + (LINE_ENDS(packet->content_line, "application/json-rpc") != 0)) + { + NDPI_LOG_INFO(ndpi_struct, "found JSON-RPC over HTTP\n"); + ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_JSON_RPC, + NDPI_PROTOCOL_HTTP, NDPI_CONFIDENCE_DPI); + } + return; + } + + if ((packet->payload_packet_len > 30) && (packet->payload[0] == '{') && + (ndpi_strnstr((const char *)packet->payload, "\"jsonrpc\":", packet->payload_packet_len))) + { + NDPI_LOG_INFO(ndpi_struct, "found JSON-RPC over TCP\n"); + ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_JSON_RPC, + NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI); + return; + } + + NDPI_EXCLUDE_PROTO(ndpi_struct, flow); +} + +void init_json_rpc_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id) +{ + ndpi_set_bitmask_protocol_detection("JSON-RPC", ndpi_struct, *id, + NDPI_PROTOCOL_JSON_RPC, + ndpi_search_json_rpc, + NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION, + SAVE_DETECTION_BITMASK_AS_UNKNOWN, + ADD_TO_DETECTION_BITMASK); + *id += 1; +} -- cgit v1.2.3