diff options
Diffstat (limited to 'include/protocol.h')
| -rw-r--r-- | include/protocol.h | 35 |
1 files changed, 29 insertions, 6 deletions
diff --git a/include/protocol.h b/include/protocol.h index 34ad4a3..38f5aa9 100644 --- a/include/protocol.h +++ b/include/protocol.h @@ -23,10 +23,11 @@ #include <errno.h> -#define E_TLV_OVERFLOW (1 << 0) +#define E_TLV_OVERFLOW (1 << 0) #define E_UNKNOWN_TYPE (1 << 1) -#define E_IVALID_DESCRIPTOR (1 << 2) -#define END_OF_PACKET (1 << 3) +#define END_OF_PACKET (1 << 2) + +#define TLV_SZ_MAX_RAW (MTU - 64) /** * Regular packets contain tlv's defined by tlv_type. @@ -122,16 +123,38 @@ int get_tlv(struct tlv_parser *parser, struct tlv *ret); * */ int push_data(struct tlv_packet *packet, enum tlv_type type, char *data); - /** * Resets offset to 0 and set entire buffer to 0. */ void clear_data(struct tlv_packet *packet); +/** + * Initialises tlv to sane values. + */ +void tlv_init(struct tlv *t); + +/** + * Frees data held in the tlv structure. The structure itself shall be freed as + * needed by calling code. + */ +void tlv_destroy(struct tlv *t); + +/** + * Tells amount of bytes needed to push tlv to a buffer + */ +size_t tlv_raw_size(struct tlv *t); + +/** + * Pushes tlv to buffer as contiguous data. Check tlv size with tlv_raw_size + * beforehand. If you don't do that and overflow --- tough tiddy. + */ +int tlv_get_raw(struct tlv *t, char *buf); /** - * Tells what size of buffer is needed for next tlv. + * Pushes data to tlv. Returns E_TLV_OVERFLOW if pushing data would cause the + * final size to be greater than TLV_SZ_MAX_RAW. In case of such error the data is left + * untouched. */ -size_t tlv_data_size(struct tlv_parser *parser); +int tlv_push(struct tlv *t, const char *data, size_t size); #endif /* USURPATION_PROTOCOL_H_INCLUDED */ |