diff options
Diffstat (limited to 'src/lib/protocols/hsrp.c')
| -rw-r--r-- | src/lib/protocols/hsrp.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/src/lib/protocols/hsrp.c b/src/lib/protocols/hsrp.c new file mode 100644 index 000000000..4b8359548 --- /dev/null +++ b/src/lib/protocols/hsrp.c @@ -0,0 +1,78 @@ +/* + * ayiya.c + * + * Copyright (C) 2011-22 - 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/>. + * + */ + +/* + https://www.cisco.com/c/en/us/support/docs/ip/hot-standby-router-protocol-hsrp/9234-hsrpguidetoc.html +*/ + +#include "ndpi_protocol_ids.h" + +#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_HSRP + +#include "ndpi_api.h" + +#define HSRP_PORT 1985 + +void ndpi_search_hsrp(struct ndpi_detection_module_struct *ndpi_struct, + struct ndpi_flow_struct *flow) { + struct ndpi_packet_struct *packet = &ndpi_struct->packet; + + NDPI_LOG_DBG(ndpi_struct, "search HSRP\n"); + + if(packet->iph && packet->udp && (flow->detected_protocol_stack[0] == NDPI_PROTOCOL_UNKNOWN)) { + u_int16_t port_to_match = htons(HSRP_PORT); + + if((packet->udp->source == port_to_match) && (packet->udp->dest == port_to_match)) { + u_int8_t found = 0; + + if((ntohl(packet->iph->daddr) == 0xE0000002 /* 224.0.0.2 v0 */) + && (packet->payload_packet_len >= 20) + && (packet->payload[0] == 0x0 /* v0 */) + && (packet->payload[7] == 0x0 /* reserved */)) + found = 1; /* v0 */ + else if((packet->payload_packet_len >= 42) + && (packet->payload[2] == 0x02) /* Version 2 */ + && (packet->payload[5] == 0x04) /* IPv4 */ + && (ntohl(packet->iph->daddr) == 0xE0000066 /* 224.0.0.102 v2 */)) + found = 1; + + if(found) { + NDPI_LOG_INFO(ndpi_struct, "found HSRP\n"); + ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_HSRP, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI); + return; + } + } + } + + NDPI_EXCLUDE_PROTO(ndpi_struct, flow); +} + + +void init_hsrp_dissector(struct ndpi_detection_module_struct *ndpi_struct, + u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask) { + ndpi_set_bitmask_protocol_detection("HSRP", ndpi_struct, detection_bitmask, *id, + NDPI_PROTOCOL_HSRP, + ndpi_search_hsrp, + NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD, + SAVE_DETECTION_BITMASK_AS_UNKNOWN, + ADD_TO_DETECTION_BITMASK); + + *id += 1; +} |