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ntp: rework packet parsing

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Rework the code to detect the authentication mode and count extension
fields in the first parsing of the packet and store this information in
the new packet info structure.
This commit is contained in:
Miroslav Lichvar
2019-08-14 15:53:17 +02:00
parent cabcccd6c3
commit 588785e160
2 changed files with 162 additions and 98 deletions
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19
ntp.h
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@@ -110,11 +110,30 @@ typedef struct {
#define NTP_REFID_LOCAL 0x7F7F0101UL /* 127.127.1.1 */
#define NTP_REFID_SMOOTH 0x7F7F01FFUL /* 127.127.1.255 */
/* Enumeration for authentication modes of NTP packets */
typedef enum {
AUTH_NONE = 0, /* No authentication */
AUTH_SYMMETRIC, /* MAC using symmetric key (RFC 1305, RFC 5905) */
AUTH_MSSNTP, /* MS-SNTP authenticator field */
AUTH_MSSNTP_EXT, /* MS-SNTP extended authenticator field */
} NTP_AuthMode;
/* Structure describing an NTP packet */
typedef struct {
int length;
int version;
NTP_Mode mode;
int ext_fields;
struct {
NTP_AuthMode mode;
struct {
int start;
int length;
uint32_t key_id;
} mac;
} auth;
} NTP_PacketInfo;
/* Structure used to save NTP measurements. time is the local time at which