49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
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#include "decode_udp.h"
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#define UDP_GET_LEN(udp_hdr) ((uint16_t)ntohs((udp_hdr)->udp_len))
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#define UDP_GET_SRC_PORT(udp_hdr) ((uint16_t)ntohs((udp_hdr)->udp_src_port))
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#define UDP_GET_DST_PORT(udp_hdr) ((uint16_t)ntohs((udp_hdr)->udp_dst_port))
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int decode_udp(udp_info_t *packet, const uint8_t *data, uint32_t len)
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{
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if (len < UDP_HEADER_LEN)
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{
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LOG_ERROR("Parser UDP Header: packet length too small %d", len);
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return -1;
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}
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packet->hdr = (udp_header_t *)data;
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// 检查 UDP header len
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if (len < UDP_GET_LEN(packet->hdr))
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{
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LOG_ERROR("Parser UDP Header: UDP packet too small %d", len);
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return -1;
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}
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// 检查 UDP header len
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if (len != UDP_GET_LEN(packet->hdr))
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{
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LOG_ERROR("Parser UDP Header: invalid UDP header length %d", UDP_GET_LEN(packet->hdr));
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return -1;
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}
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packet->src_port = UDP_GET_SRC_PORT(packet->hdr);
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packet->dst_port = UDP_GET_DST_PORT(packet->hdr);
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packet->hdr_len = UDP_HEADER_LEN;
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packet->payload = (uint8_t *)data + UDP_HEADER_LEN;
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packet->payload_len = len - UDP_HEADER_LEN;
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return 0;
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}
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void dump_udp_info(uint32_t pkt_id, udp_info_t *packet)
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{
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LOG_DEBUG("id: %u, udp_info: {src_port: %u, dst_port: %u, hdr_len: %u, data_len: %u}",
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pkt_id,
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packet->src_port,
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packet->dst_port,
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packet->hdr_len,
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packet->payload_len);
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}
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