all repos — circe-vpn @ e6e976ca669f07931e13bef5453e9b4969a76d83

Circe VPN

core/core.c (view raw)

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#include "core.h"
#include "cbor.h"
#include "packet.h"
#include <stdbool.h>

#define CIRCE_CORE_ASSERT(x, err)                                             \
  do                                                                          \
    {                                                                         \
      if (!(x))                                                               \
        {                                                                     \
          return err;                                                         \
        }                                                                     \
    }                                                                         \
  while (false)

enum circe_result
circe_handle_packet (struct circe_ctx *ctx, const uint8_t *in, uint32_t len,
                     uint64_t now_ms, uint8_t *out, uint32_t *out_len,
                     struct circe_event *events, uint32_t *n_events)
{
  struct circe_cbor_decoder cd = {
    .buf_start = in,
    .buf_len = len,
    .cursor = in,
  };
  enum circe_cbor_major_type major_type;
  CIRCE_CORE_ASSERT (circe_cbor_get_major_type (&cd, &major_type),
                     CIRCE_RESULT_INVALID_PACKET);
  CIRCE_CORE_ASSERT (major_type == CIRCE_CBOR_MAJOR_MAPPING,
                     CIRCE_RESULT_INVALID_PACKET);
  uint64_t num_fields;
  CIRCE_CORE_ASSERT (circe_cbor_extract_unsigned (&cd, &num_fields),
                     CIRCE_RESULT_INVALID_PACKET);
  CIRCE_CORE_ASSERT (num_fields > 0, CIRCE_RESULT_INVALID_PACKET);
  CIRCE_CORE_ASSERT (circe_cbor_get_major_type (&cd, &major_type),
                     CIRCE_RESULT_INVALID_PACKET);
  CIRCE_CORE_ASSERT (major_type == CIRCE_CBOR_MAJOR_UNSIGNED,
                     CIRCE_RESULT_INVALID_PACKET);
  uint64_t field;
  CIRCE_CORE_ASSERT (circe_cbor_extract_unsigned (&cd, &field),
                     CIRCE_RESULT_INVALID_PACKET);
  CIRCE_CORE_ASSERT (field < CIRCE_PACKET_FIELD_OVERMAX,
                     CIRCE_RESULT_INVALID_PACKET);
  return CIRCE_RESULT_SUCCESS;
}