messenger_api_message.h File Reference

#include "gnunet_util_lib.h"
#include "gnunet_messenger_service.h"

Include dependency graph for messenger_api_message.h:

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Go to the source code of this file.

Macros
#define	GNUNET_MESSENGER_MAX_MESSAGE_SIZE
#define	GNUNET_MESSENGER_PADDING_MIN   (sizeof(uint16_t) + sizeof(char))
#define	GNUNET_MESSENGER_PADDING_LEVEL0   (512)
#define	GNUNET_MESSENGER_PADDING_LEVEL1   (4096)
#define	GNUNET_MESSENGER_PADDING_LEVEL2   (32768)

Typedefs
typedef void(*	GNUNET_MESSENGER_SignFunction) (const void *cls, struct GNUNET_MESSENGER_Message *message, uint16_t length, char *buffer, const struct GNUNET_HashCode *hash)

Enumerations
enum	GNUNET_MESSENGER_PackMode { GNUNET_MESSENGER_PACK_MODE_ENVELOPE = 0x1 , GNUNET_MESSENGER_PACK_MODE_UNKNOWN = 0x0 }

Functions
struct GNUNET_MESSENGER_Message *	create_message (enum GNUNET_MESSENGER_MessageKind kind)
	Creates and allocates a new message with a specific kind.
struct GNUNET_MESSENGER_Message *	copy_message (const struct GNUNET_MESSENGER_Message *message)
	Creates and allocates a copy of a given message.
void	copy_message_header (struct GNUNET_MESSENGER_Message *message, const struct GNUNET_MESSENGER_MessageHeader *header)
	Copy message header details from another message to a given message.
void	cleanup_message (struct GNUNET_MESSENGER_Message *message)
	Frees the messages body memory.
void	destroy_message (struct GNUNET_MESSENGER_Message *message)
	Destroys a message and frees its memory fully.
enum GNUNET_GenericReturnValue	is_message_session_bound (const struct GNUNET_MESSENGER_Message *message)
	Returns if the message should be bound to a member session.
uint16_t	get_message_kind_size (enum GNUNET_MESSENGER_MessageKind kind, enum GNUNET_GenericReturnValue include_header)
	Returns the minimal size in bytes to encode a message of a specific kind.
uint16_t	get_message_size (const struct GNUNET_MESSENGER_Message *message, enum GNUNET_GenericReturnValue include_header)
	Returns the exact size in bytes to encode a given message.
void	encode_message (const struct GNUNET_MESSENGER_Message *message, uint16_t length, char *buffer, enum GNUNET_GenericReturnValue include_header)
	Encodes a given message into a buffer of a maximal length in bytes.
enum GNUNET_GenericReturnValue	decode_message (struct GNUNET_MESSENGER_Message *message, uint16_t length, const char *buffer, enum GNUNET_GenericReturnValue include_header, uint16_t *padding)
	Decodes a message from a given buffer of a maximal length in bytes.
void	hash_message (const struct GNUNET_MESSENGER_Message *message, uint16_t length, const char *buffer, struct GNUNET_HashCode *hash)
	Calculates a hash of a given buffer with a length in bytes from a message.
void	sign_message (struct GNUNET_MESSENGER_Message *message, uint16_t length, char *buffer, const struct GNUNET_HashCode *hash, const struct GNUNET_CRYPTO_BlindablePrivateKey *key)
	Signs the hash of a message with a given private key and writes the signature into the buffer as well.
void	sign_message_by_peer (struct GNUNET_MESSENGER_Message *message, uint16_t length, char *buffer, const struct GNUNET_HashCode *hash, const struct GNUNET_CONFIGURATION_Handle *cfg)
	Signs the hash of a message with the peer identity of a given config and writes the signature into the buffer as well.
void	sign_message_by_key (struct GNUNET_MESSENGER_Message *message, const struct GNUNET_CRYPTO_SymmetricSessionKey *key)
	Signs the message body via it's own hmac with a specific shared key.
enum GNUNET_GenericReturnValue	verify_message (const struct GNUNET_MESSENGER_Message *message, const struct GNUNET_HashCode *hash, const struct GNUNET_CRYPTO_BlindablePublicKey *key)
	Verifies the signature of a given message and its hash with a specific public key.
enum GNUNET_GenericReturnValue	verify_message_by_peer (const struct GNUNET_MESSENGER_Message *message, const struct GNUNET_HashCode *hash, const struct GNUNET_PeerIdentity *identity)
	Verifies the signature of a given message and its hash with a specific peer's identity.
enum GNUNET_GenericReturnValue	verify_message_by_key (const struct GNUNET_MESSENGER_Message *message, const struct GNUNET_CRYPTO_SymmetricSessionKey *key)
	Verifies the hmac of a given message body with a specific shared key.
enum GNUNET_GenericReturnValue	encrypt_message (struct GNUNET_MESSENGER_Message *message, const struct GNUNET_CRYPTO_HpkePublicKey *hpke_key)
	Encrypts a message using a given public key and replaces its body and kind with the now private encrypted message.
enum GNUNET_GenericReturnValue	decrypt_message (struct GNUNET_MESSENGER_Message *message, const struct GNUNET_CRYPTO_HpkePrivateKey *hpke_key)
	Decrypts a private message using a given private key and replaces its body and kind with the inner encrypted message.
struct GNUNET_MESSENGER_Message *	transcribe_message (const struct GNUNET_MESSENGER_Message *message, const struct GNUNET_CRYPTO_BlindablePublicKey *key)
	Transcribes a message as a new transcript message using a given public key from the recipient of the encrypted message content.
enum GNUNET_GenericReturnValue	encrypt_secret_message (struct GNUNET_MESSENGER_Message *message, const union GNUNET_MESSENGER_EpochIdentifier *identifier, const struct GNUNET_CRYPTO_SymmetricSessionKey *key)
	Encrypts a message using a given shared key from an announcement of an epoch and replaces its body and kind with the inner encrypted message.
enum GNUNET_GenericReturnValue	decrypt_secret_message (struct GNUNET_MESSENGER_Message *message, const struct GNUNET_CRYPTO_SymmetricSessionKey *key)
	Decrypts a secret message using a given shared key and replaces its body and kind with the inner encrypted message.
enum GNUNET_GenericReturnValue	read_transcript_message (struct GNUNET_MESSENGER_Message *message)
	Read the original message from a transcript message and replaces its body and kind with the inner encrypted message.
enum GNUNET_GenericReturnValue	extract_access_message_key (const struct GNUNET_MESSENGER_Message *message, const struct GNUNET_CRYPTO_HpkePrivateKey *key, struct GNUNET_CRYPTO_SymmetricSessionKey *shared_key)
	Extracts the shared epoch or group key from an access message using the private ephemeral key from an epoch and verifies it via the HMAC from the message body.
enum GNUNET_GenericReturnValue	extract_authorization_message_key (struct GNUNET_MESSENGER_Message *message, const struct GNUNET_CRYPTO_SymmetricSessionKey *key, struct GNUNET_CRYPTO_SymmetricSessionKey *shared_key)
	Extracts the shared epoch or group key from an authorization message using a previously exchanged shared key and verifies it via the HMAC from the message body.
struct GNUNET_TIME_Relative	get_message_timeout (const struct GNUNET_MESSENGER_Message *message)
	Return the relative timeout of the content from a given message that controls when a delayed handling action of this message needs to be processed at least.
struct GNUNET_MQ_Envelope *	pack_message (struct GNUNET_MESSENGER_Message *message, struct GNUNET_HashCode *hash, const GNUNET_MESSENGER_SignFunction sign, enum GNUNET_MESSENGER_PackMode mode, const void *cls)
	Encodes the message to pack it into a newly allocated envelope if mode is equal to GNUNET_MESSENGER_PACK_MODE_ENVELOPE.
enum GNUNET_GenericReturnValue	is_peer_message (const struct GNUNET_MESSENGER_Message *message)
	Returns whether a specific kind of message can be sent by the service without usage of a clients private key.
enum GNUNET_GenericReturnValue	is_service_message (const struct GNUNET_MESSENGER_Message *message)
	Returns whether a specific kind of message contains service critical information.
enum GNUNET_GenericReturnValue	is_epoch_message (const struct GNUNET_MESSENGER_Message *message)
	Returns whether a certain kind of message from storage contains some specific details that might be required for the overall message graph to function as intended.
enum GNUNET_GenericReturnValue	filter_message_sending (const struct GNUNET_MESSENGER_Message *message)
	Returns whether a specific kind of message should be sent by a client.
const struct GNUNET_ShortHashCode *	get_message_discourse (const struct GNUNET_MESSENGER_Message *message)
	Returns the discourse hash of a message depending on its kind.

Macro Definition Documentation

GNUNET_MESSENGER_MAX_MESSAGE_SIZE

#define GNUNET_MESSENGER_MAX_MESSAGE_SIZE

Value:

                                           (GNUNET_MAX_MESSAGE_SIZE \
                                           - GNUNET_MIN_MESSAGE_SIZE)

Definition at line 33 of file messenger_api_message.h.

{
  GNUNET_MESSENGER_PACK_MODE_ENVELOPE = 0x1,
  GNUNET_MESSENGER_PACK_MODE_UNKNOWN = 0x0,
};
 
struct GNUNET_MQ_Envelope*
pack_message (struct GNUNET_MESSENGER_Message *message,
              struct GNUNET_HashCode *hash,
              const GNUNET_MESSENGER_SignFunction sign,
              enum GNUNET_MESSENGER_PackMode mode,
              const void *cls);
 
enum GNUNET_GenericReturnValue
is_peer_message (const struct GNUNET_MESSENGER_Message *message);
 
enum GNUNET_GenericReturnValue
is_service_message (const struct GNUNET_MESSENGER_Message *message);
 
enum GNUNET_GenericReturnValue
is_epoch_message (const struct GNUNET_MESSENGER_Message *message);
 
enum GNUNET_GenericReturnValue
filter_message_sending (const struct GNUNET_MESSENGER_Message *message);
 
const struct GNUNET_ShortHashCode*
get_message_discourse (const struct GNUNET_MESSENGER_Message *message);
 
#endif // GNUNET_MESSENGER_API_MESSAGE_H

GNUNET_MESSENGER_PADDING_MIN

#define GNUNET_MESSENGER_PADDING_MIN   (sizeof(uint16_t) + sizeof(char))

Definition at line 36 of file messenger_api_message.h.

GNUNET_MESSENGER_PADDING_LEVEL0

#define GNUNET_MESSENGER_PADDING_LEVEL0   (512)

Definition at line 37 of file messenger_api_message.h.

GNUNET_MESSENGER_PADDING_LEVEL1

#define GNUNET_MESSENGER_PADDING_LEVEL1   (4096)

Definition at line 38 of file messenger_api_message.h.

GNUNET_MESSENGER_PADDING_LEVEL2

#define GNUNET_MESSENGER_PADDING_LEVEL2   (32768)

Definition at line 39 of file messenger_api_message.h.

Typedef Documentation

GNUNET_MESSENGER_SignFunction

typedef void(* GNUNET_MESSENGER_SignFunction) (const void *cls, struct GNUNET_MESSENGER_Message *message, uint16_t length, char *buffer, const struct GNUNET_HashCode *hash)

Definition at line 382 of file messenger_api_message.h.

Enumeration Type Documentation

GNUNET_MESSENGER_PackMode

enum GNUNET_MESSENGER_PackMode

Enumerator
GNUNET_MESSENGER_PACK_MODE_ENVELOPE
GNUNET_MESSENGER_PACK_MODE_UNKNOWN

Definition at line 389 of file messenger_api_message.h.

{
  GNUNET_MESSENGER_PACK_MODE_ENVELOPE = 0x1,
  GNUNET_MESSENGER_PACK_MODE_UNKNOWN = 0x0,
};

Function Documentation

create_message()

struct GNUNET_MESSENGER_Message * create_message

(

enum GNUNET_MESSENGER_MessageKind

kind

)

Creates and allocates a new message with a specific kind.

Parameters

[in]

kind

Kind of message

Returns

New message

Definition at line 48 of file messenger_api_message.c.

{
  struct GNUNET_MESSENGER_Message *message;
 
  message = GNUNET_new (struct GNUNET_MESSENGER_Message);
  message->header.kind = kind;
 
  switch (message->header.kind)
  {
  case GNUNET_MESSENGER_KIND_NAME:
    message->body.name.name = NULL;
    break;
  case GNUNET_MESSENGER_KIND_TEXT:
    message->body.text.text = NULL;
    break;
  case GNUNET_MESSENGER_KIND_FILE:
    message->body.file.uri = NULL;
    break;
  case GNUNET_MESSENGER_KIND_PRIVATE:
    message->body.privacy.length = 0;
    message->body.privacy.data = NULL;
    break;
  case GNUNET_MESSENGER_KIND_TICKET:
    message->body.ticket.identifier = NULL;
    break;
  case GNUNET_MESSENGER_KIND_TRANSCRIPT:
    message->body.transcript.length = 0;
    message->body.transcript.data = NULL;
    break;
  case GNUNET_MESSENGER_KIND_TAG:
    message->body.tag.tag = NULL;
    break;
  case GNUNET_MESSENGER_KIND_TALK:
    message->body.talk.length = 0;
    message->body.talk.data = NULL;
    break;
  case GNUNET_MESSENGER_KIND_SECRET:
    message->body.secret.length = 0;
    message->body.secret.data = NULL;
    break;
  default:
    break;
  }
 
  return message;
}

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_MessagePrivate::data, GNUNET_MESSENGER_MessageTranscript::data, GNUNET_MESSENGER_MessageTalk::data, GNUNET_MESSENGER_MessageSecret::data, GNUNET_MESSENGER_MessageBody::file, GNUNET_MESSENGER_KIND_FILE, GNUNET_MESSENGER_KIND_NAME, GNUNET_MESSENGER_KIND_PRIVATE, GNUNET_MESSENGER_KIND_SECRET, GNUNET_MESSENGER_KIND_TAG, GNUNET_MESSENGER_KIND_TALK, GNUNET_MESSENGER_KIND_TEXT, GNUNET_MESSENGER_KIND_TICKET, GNUNET_MESSENGER_KIND_TRANSCRIPT, GNUNET_new, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageTicket::identifier, GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_MessagePrivate::length, GNUNET_MESSENGER_MessageTranscript::length, GNUNET_MESSENGER_MessageTalk::length, GNUNET_MESSENGER_MessageSecret::length, GNUNET_MESSENGER_MessageName::name, GNUNET_MESSENGER_MessageBody::name, GNUNET_MESSENGER_MessageBody::privacy, GNUNET_MESSENGER_MessageBody::secret, GNUNET_MESSENGER_MessageTag::tag, GNUNET_MESSENGER_MessageBody::tag, GNUNET_MESSENGER_MessageBody::talk, GNUNET_MESSENGER_MessageText::text, GNUNET_MESSENGER_MessageBody::text, GNUNET_MESSENGER_MessageBody::ticket, GNUNET_MESSENGER_MessageBody::transcript, and GNUNET_MESSENGER_MessageFile::uri.

Referenced by create_message_access(), create_message_announcement(), create_message_appeal(), create_message_authorization(), create_message_connection(), create_message_deletion(), create_message_group(), create_message_id(), create_message_info(), create_message_join(), create_message_key(), create_message_leave(), create_message_merge(), create_message_miss(), create_message_name(), create_message_peer(), create_message_request(), create_message_revolution(), create_message_subscription(), get_store_message(), and transcribe_message().

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copy_message()

struct GNUNET_MESSENGER_Message * copy_message

(

const struct GNUNET_MESSENGER_Message *

message

)

Creates and allocates a copy of a given message.

Parameters

[in]

message

Message

Returns

New message

Definition at line 97 of file messenger_api_message.c.

{
  struct GNUNET_MESSENGER_Message *copy;
 
  GNUNET_assert (message);
 
  copy = GNUNET_new (struct GNUNET_MESSENGER_Message);
  GNUNET_memcpy (copy, message, sizeof(struct GNUNET_MESSENGER_Message));
 
  switch (message->header.kind)
  {
  case GNUNET_MESSENGER_KIND_NAME:
    copy->body.name.name = message->body.name.name? GNUNET_strdup (
      message->body.name.name) : NULL;
    break;
  case GNUNET_MESSENGER_KIND_TEXT:
    copy->body.text.text = message->body.text.text? GNUNET_strdup (
      message->body.text.text) : NULL;
    break;
  case GNUNET_MESSENGER_KIND_FILE:
    copy->body.file.uri = message->body.file.uri? GNUNET_strdup (
      message->body.file.uri) : NULL;
    break;
  case GNUNET_MESSENGER_KIND_PRIVATE:
    copy->body.privacy.data = copy->body.privacy.length ? GNUNET_malloc (
      copy->body.privacy.length) : NULL;
 
    if (copy->body.privacy.data)
      GNUNET_memcpy (copy->body.privacy.data, message->body.privacy.data,
                     copy->body.privacy.length);
 
    break;
  case GNUNET_MESSENGER_KIND_TICKET:
    copy->body.ticket.identifier = message->body.ticket.identifier?
                                   GNUNET_strdup (
      message->body.ticket.identifier) : NULL;
    break;
  case GNUNET_MESSENGER_KIND_TRANSCRIPT:
    copy->body.transcript.data = copy->body.transcript.length ? GNUNET_malloc (
      copy->body.transcript.length) : NULL;
 
    if (copy->body.transcript.data)
      GNUNET_memcpy (copy->body.transcript.data, message->body.transcript.data,
                     copy->body.transcript.length);
 
    break;
  case GNUNET_MESSENGER_KIND_TAG:
    copy->body.tag.tag = message->body.tag.tag? GNUNET_strdup (
      message->body.tag.tag) : NULL;
    break;
  case GNUNET_MESSENGER_KIND_TALK:
    copy->body.talk.data = copy->body.talk.length ? GNUNET_malloc (
      copy->body.talk.length) : NULL;
 
    if (copy->body.talk.data)
      GNUNET_memcpy (copy->body.talk.data, message->body.talk.data,
                     copy->body.talk.length);
 
    break;
  case GNUNET_MESSENGER_KIND_SECRET:
    copy->body.secret.data = copy->body.secret.length ? GNUNET_malloc (
      copy->body.secret.length) : NULL;
 
    if (copy->body.secret.data)
      GNUNET_memcpy (copy->body.secret.data, message->body.secret.data,
                     copy->body.secret.length);
 
    break;
  default:
    break;
  }
 
  return copy;
}

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_MessagePrivate::data, GNUNET_MESSENGER_MessageTranscript::data, GNUNET_MESSENGER_MessageTalk::data, GNUNET_MESSENGER_MessageSecret::data, GNUNET_MESSENGER_MessageBody::file, GNUNET_assert, GNUNET_malloc, GNUNET_memcpy, GNUNET_MESSENGER_KIND_FILE, GNUNET_MESSENGER_KIND_NAME, GNUNET_MESSENGER_KIND_PRIVATE, GNUNET_MESSENGER_KIND_SECRET, GNUNET_MESSENGER_KIND_TAG, GNUNET_MESSENGER_KIND_TALK, GNUNET_MESSENGER_KIND_TEXT, GNUNET_MESSENGER_KIND_TICKET, GNUNET_MESSENGER_KIND_TRANSCRIPT, GNUNET_new, GNUNET_strdup, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageTicket::identifier, GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_MessagePrivate::length, GNUNET_MESSENGER_MessageTranscript::length, GNUNET_MESSENGER_MessageTalk::length, GNUNET_MESSENGER_MessageSecret::length, GNUNET_MESSENGER_MessageName::name, GNUNET_MESSENGER_MessageBody::name, GNUNET_MESSENGER_MessageBody::privacy, GNUNET_MESSENGER_MessageBody::secret, GNUNET_MESSENGER_MessageTag::tag, GNUNET_MESSENGER_MessageBody::tag, GNUNET_MESSENGER_MessageBody::talk, GNUNET_MESSENGER_MessageText::text, GNUNET_MESSENGER_MessageBody::text, GNUNET_MESSENGER_MessageBody::ticket, GNUNET_MESSENGER_MessageBody::transcript, and GNUNET_MESSENGER_MessageFile::uri.

Referenced by enqueue_message_control(), forward_tunnel_message(), GNUNET_MESSENGER_send_message(), handle_private_message(), handle_room_message(), handle_transcript_message(), handle_tunnel_message(), send_srv_handle_message(), and update_room_secret_message().

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copy_message_header()

void copy_message_header	(	struct GNUNET_MESSENGER_Message *	message,
		const struct GNUNET_MESSENGER_MessageHeader *	header
	)

Copy message header details from another message to a given message.

Parameters

[in,out]	message	Message
[in]	header	Message header

Definition at line 174 of file messenger_api_message.c.

{
  enum GNUNET_MESSENGER_MessageKind kind;
 
  GNUNET_assert ((message) && (header));
 
  kind = message->header.kind;
 
  GNUNET_memcpy (&(message->header), header,
                 sizeof(struct GNUNET_MESSENGER_MessageHeader));
 
  message->header.kind = kind;
}

References GNUNET_assert, GNUNET_memcpy, GNUNET_MESSENGER_Message::header, and GNUNET_MESSENGER_MessageHeader::kind.

Referenced by handle_room_message(), and handle_transcript_message().

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cleanup_message()

void cleanup_message

(

struct GNUNET_MESSENGER_Message *

message

)

Frees the messages body memory.

Parameters

[in,out]

message

Message

Definition at line 241 of file messenger_api_message.c.

{
  GNUNET_assert (message);
 
  destroy_message_body (message->header.kind, &(message->body));
}

References GNUNET_MESSENGER_Message::body, destroy_message_body(), GNUNET_assert, GNUNET_MESSENGER_Message::header, and GNUNET_MESSENGER_MessageHeader::kind.

Referenced by check_recv_message(), check_send_message(), handle_recv_message(), handle_send_message(), and handle_tunnel_message().

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destroy_message()

void destroy_message

(

struct GNUNET_MESSENGER_Message *

message

)

Destroys a message and frees its memory fully.

Parameters

[in,out]

message

Message

Definition at line 250 of file messenger_api_message.c.

{
  GNUNET_assert (message);
 
  destroy_message_body (message->header.kind, &(message->body));
 
  GNUNET_free (message);
}

References GNUNET_MESSENGER_Message::body, destroy_message_body(), GNUNET_assert, GNUNET_free, GNUNET_MESSENGER_Message::header, and GNUNET_MESSENGER_MessageHeader::kind.

Referenced by clear_queue_messages(), create_message_access(), create_message_authorization(), create_message_peer(), dequeue_from_messages(), dequeue_message_from_room(), destroy_message_control(), enqueue_to_messages(), forward_tunnel_message(), get_store_message(), handle_discourse_subscription(), handle_private_message(), handle_room_delayed_deletion(), handle_transcript_message(), iterate_destroy_message(), iterate_destroy_messages(), iterate_destroy_subscription(), iterate_flag_for_cleanup_discourse_message(), keep_subscription_alive(), send_message_to_room_with_key(), send_tunnel_message(), task_message_control(), update_room_message(), and update_room_secret_message().

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is_message_session_bound()

enum GNUNET_GenericReturnValue is_message_session_bound

(

const struct GNUNET_MESSENGER_Message *

message

)

Returns if the message should be bound to a member session.

Parameters

[in]

message

Message

Returns

GNUNET_YES or GNUNET_NO

Definition at line 261 of file messenger_api_message.c.

{
  GNUNET_assert (message);
 
  if ((GNUNET_MESSENGER_KIND_JOIN == message->header.kind) ||
      (GNUNET_MESSENGER_KIND_LEAVE == message->header.kind) ||
      (GNUNET_MESSENGER_KIND_NAME == message->header.kind) ||
      (GNUNET_MESSENGER_KIND_KEY == message->header.kind) ||
      (GNUNET_MESSENGER_KIND_ID == message->header.kind))
    return GNUNET_YES;
  else
    return GNUNET_NO;
}

References GNUNET_assert, GNUNET_MESSENGER_KIND_ID, GNUNET_MESSENGER_KIND_JOIN, GNUNET_MESSENGER_KIND_KEY, GNUNET_MESSENGER_KIND_LEAVE, GNUNET_MESSENGER_KIND_NAME, GNUNET_NO, GNUNET_YES, GNUNET_MESSENGER_Message::header, and GNUNET_MESSENGER_MessageHeader::kind.

Referenced by enqueue_message_to_room(), and update_member_session_history().

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get_message_kind_size()

uint16_t get_message_kind_size	(	enum GNUNET_MESSENGER_MessageKind	kind,
		enum GNUNET_GenericReturnValue	include_header
	)

Returns the minimal size in bytes to encode a message of a specific kind.

Parameters

[in]	kind	Kind of message
[in]	include_header	Flag to include header

Returns

Minimal size to encode

Definition at line 457 of file messenger_api_message.c.

{
  uint16_t length;
 
  length = 0;
 
  if (GNUNET_YES == include_header)
  {
    length += member_size (struct GNUNET_MESSENGER_Message, header.timestamp);
    length += member_size (struct GNUNET_MESSENGER_Message, header.sender_id);
    length += member_size (struct GNUNET_MESSENGER_Message, header.previous);
  }
 
  length += sizeof(kind_t);
 
  return length + get_message_body_kind_size (kind);
}

References get_message_body_kind_size(), GNUNET_YES, GNUNET_MESSENGER_Message::header, member_size, GNUNET_MESSENGER_MessageHeader::previous, GNUNET_MESSENGER_MessageHeader::sender_id, and GNUNET_MESSENGER_MessageHeader::timestamp.

Referenced by calc_usual_padding(), check_recv_message(), check_send_message(), check_tunnel_message(), decode_message(), get_message_size(), and get_store_message().

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get_message_size()

uint16_t get_message_size	(	const struct GNUNET_MESSENGER_Message *	message,
		enum GNUNET_GenericReturnValue	include_header
	)

Returns the exact size in bytes to encode a given message.

Parameters

[in]	message	Message
[in]	include_header	Flag to include header

Returns

Size to encode

Definition at line 532 of file messenger_api_message.c.

{
  uint16_t length;
 
  GNUNET_assert (message);
 
  length = 0;
 
  if (GNUNET_YES == include_header)
    length += GNUNET_CRYPTO_blinded_key_signature_get_length (
      &(message->header.signature));
 
  length += get_message_kind_size (message->header.kind, include_header);
  length += get_message_body_size (message->header.kind, &(message->body));
 
  return length;
}

References GNUNET_MESSENGER_Message::body, get_message_body_size(), get_message_kind_size(), GNUNET_assert, GNUNET_CRYPTO_blinded_key_signature_get_length(), GNUNET_YES, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageHeader::kind, and GNUNET_MESSENGER_MessageHeader::signature.

Referenced by iterate_save_messages(), notify_srv_handle_message(), pack_message(), and send_message_to_room().

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encode_message()

void encode_message	(	const struct GNUNET_MESSENGER_Message *	message,
		uint16_t	length,
		char *	buffer,
		enum GNUNET_GenericReturnValue	include_header
	)

Encodes a given message into a buffer of a maximal length in bytes.

Parameters

[in]	message	Message
[in]	length	Maximal length to encode
[out]	buffer	Buffer
[in]	include_header	Flag to include header

Definition at line 861 of file messenger_api_message.c.

{
  uint16_t offset;
  kind_t kind;
 
  GNUNET_assert ((message) && (buffer));
 
  offset = 0;
 
  if (GNUNET_YES == include_header)
    encode_step_signature (buffer, offset, &(message->header.signature),
                           length);
 
  kind = GNUNET_htobe32 ((kind_t) message->header.kind);
 
  if (GNUNET_YES == include_header)
  {
    encode_step (buffer, offset, &(message->header.timestamp));
    encode_step (buffer, offset, &(message->header.sender_id));
    encode_step (buffer, offset, &(message->header.previous));
  }
 
  encode_step (buffer, offset, &kind);
 
  encode_message_body (message->header.kind, &(message->body),
                       length, buffer, offset);
}

References GNUNET_MESSENGER_Message::body, encode_message_body(), encode_step, encode_step_signature, GNUNET_assert, GNUNET_htobe32, GNUNET_YES, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_MessageHeader::previous, GNUNET_MESSENGER_MessageHeader::sender_id, GNUNET_MESSENGER_MessageHeader::signature, and GNUNET_MESSENGER_MessageHeader::timestamp.

Referenced by iterate_save_messages(), notify_srv_handle_message(), pack_message(), and send_message_to_room().

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decode_message()

enum GNUNET_GenericReturnValue decode_message	(	struct GNUNET_MESSENGER_Message *	message,
		uint16_t	length,
		const char *	buffer,
		enum GNUNET_GenericReturnValue	include_header,
		uint16_t *	padding
	)

Decodes a message from a given buffer of a maximal length in bytes.

If the buffer is too small for a message of its decoded kind the function fails with resulting GNUNET_NO after decoding only the messages header.

On success the function returns GNUNET_YES.

Parameters

[out]	message	Message
[in]	length	Maximal length to decode
[in]	buffer	Buffer
[in]	include_header	Flag to include header
[out]	padding	Padding

Returns

GNUNET_YES on success, otherwise GNUNET_NO

Definition at line 1188 of file messenger_api_message.c.

{
  uint16_t offset;
  uint16_t count;
  kind_t kind;
 
  GNUNET_assert (
    (message) &&
    (buffer) &&
    (length >= get_message_kind_size (GNUNET_MESSENGER_KIND_UNKNOWN,
                                      include_header)));
 
  offset = 0;
 
  if (GNUNET_YES == include_header)
  {
    ssize_t result;
 
    result = GNUNET_CRYPTO_read_blinded_key_signature_from_buffer (
      &(message->header.signature), buffer, length - offset);
 
    if (result < 0)
      return GNUNET_NO;
    else
      offset += result;
  }
 
  count = length - offset;
  if (count < get_message_kind_size (GNUNET_MESSENGER_KIND_UNKNOWN,
                                     include_header))
    return GNUNET_NO;
 
  if (GNUNET_YES == include_header)
  {
    decode_step (buffer, offset, &(message->header.timestamp));
    decode_step (buffer, offset, &(message->header.sender_id));
    decode_step (buffer, offset, &(message->header.previous));
  }
 
  decode_step (buffer, offset, &kind);
  kind = GNUNET_be32toh (kind);
 
  message->header.kind = (enum GNUNET_MESSENGER_MessageKind) kind;
 
  if (count < get_message_kind_size (message->header.kind, include_header))
    return GNUNET_NO;
 
  {
    uint16_t result;
    result = decode_message_body (&(message->header.kind),
                                  &(message->body), length, buffer, offset);
 
    if (padding)
      *padding = result;
  }
 
  return GNUNET_YES;
}

References GNUNET_MESSENGER_Message::body, decode_message_body(), decode_step, get_message_kind_size(), GNUNET_assert, GNUNET_be32toh, GNUNET_CRYPTO_read_blinded_key_signature_from_buffer(), GNUNET_MESSENGER_KIND_UNKNOWN, GNUNET_NO, GNUNET_YES, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_MessageHeader::previous, result, GNUNET_MESSENGER_MessageHeader::sender_id, GNUNET_MESSENGER_MessageHeader::signature, and GNUNET_MESSENGER_MessageHeader::timestamp.

Referenced by check_recv_message(), check_send_message(), check_tunnel_message(), get_store_message(), handle_recv_message(), handle_send_message(), and handle_tunnel_message().

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hash_message()

void hash_message	(	const struct GNUNET_MESSENGER_Message *	message,
		uint16_t	length,
		const char *	buffer,
		struct GNUNET_HashCode *	hash
	)

Calculates a hash of a given buffer with a length in bytes from a message.

Parameters

[in]	message	Message
[in]	length	Length of buffer
[in]	buffer	Buffer
[out]	hash	Hash

Definition at line 1297 of file messenger_api_message.c.

{
  ssize_t offset;
 
  GNUNET_assert ((message) && (buffer) && (hash));
 
  offset = GNUNET_CRYPTO_blinded_key_signature_get_length (&(message->header.
                                                             signature));
 
  GNUNET_CRYPTO_hash (buffer + offset, length - offset, hash);
}

References GNUNET_assert, GNUNET_CRYPTO_blinded_key_signature_get_length(), GNUNET_CRYPTO_hash(), and GNUNET_MESSENGER_Message::header.

Referenced by check_tunnel_message(), get_store_message(), handle_tunnel_message(), pack_message(), and send_message_to_room().

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sign_message()

void sign_message	(	struct GNUNET_MESSENGER_Message *	message,
		uint16_t	length,
		char *	buffer,
		const struct GNUNET_HashCode *	hash,
		const struct GNUNET_CRYPTO_BlindablePrivateKey *	key
	)

Signs the hash of a message with a given private key and writes the signature into the buffer as well.

Parameters

[in,out]	message	Message
[in]	length	Length of buffer
[out]	buffer	Buffer
[in]	hash	Hash of message
[in]	key	Private key

Definition at line 1314 of file messenger_api_message.c.

{
  GNUNET_assert ((message) && (buffer) && (hash) && (key));
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sign message by member: %s\n",
              GNUNET_h2s (hash));
 
  {
    struct GNUNET_MESSENGER_MessageSignature signature;
 
    signature.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE);
    signature.purpose.size = htonl (sizeof(signature));
 
    GNUNET_memcpy (&(signature.hash), hash, sizeof(signature.hash));
    GNUNET_CRYPTO_blinded_key_sign (key, &signature, &(message->header.signature
                                                       ));
  }
 
  message->header.signature.type = key->type;
 
  {
    uint16_t offset = 0;
    encode_step_signature (
      buffer,
      offset,
      &(message->header.signature),
      length);
  }
}

References encode_step_signature, GNUNET_assert, GNUNET_CRYPTO_blinded_key_sign, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_memcpy, GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE, GNUNET_MESSENGER_MessageSignature::hash, GNUNET_MESSENGER_Message::header, key, GNUNET_CRYPTO_SignaturePurpose::purpose, GNUNET_MESSENGER_MessageSignature::purpose, GNUNET_MESSENGER_MessageHeader::signature, GNUNET_CRYPTO_SignaturePurpose::size, and GNUNET_CRYPTO_BlindableKeySignature::type.

Referenced by send_message_to_room().

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sign_message_by_peer()

void sign_message_by_peer	(	struct GNUNET_MESSENGER_Message *	message,
		uint16_t	length,
		char *	buffer,
		const struct GNUNET_HashCode *	hash,
		const struct GNUNET_CONFIGURATION_Handle *	cfg
	)

Signs the hash of a message with the peer identity of a given config and writes the signature into the buffer as well.

Parameters

[in,out]	message	Message
[in]	length	Length of buffer
[out]	buffer	Buffer
[in]	hash	Hash of message
[in]	cfg	Peer configuration

Definition at line 1350 of file messenger_api_message.c.

{
  GNUNET_assert ((message) && (buffer) && (hash) && (cfg));
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sign message by peer: %s\n",
              GNUNET_h2s (hash));
 
  {
    struct GNUNET_MESSENGER_MessageSignature signature;
    signature.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE);
    signature.purpose.size = htonl (sizeof (signature));
 
    GNUNET_memcpy (&(signature.hash), hash, sizeof (signature.hash));
    GNUNET_CRYPTO_blinded_key_sign_by_peer_identity (cfg, &(signature.purpose),
                                                     &(message->header.signature
                                                       .
                                                       eddsa_signature));
  }
 
  message->header.signature.type = htonl (GNUNET_PUBLIC_KEY_TYPE_EDDSA);
 
  {
    uint16_t offset = 0;
    encode_step_signature (
      buffer,
      offset,
      &(message->header.signature),
      length);
  }
}

References cfg, encode_step_signature, GNUNET_assert, GNUNET_CRYPTO_blinded_key_sign_by_peer_identity(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_memcpy, GNUNET_PUBLIC_KEY_TYPE_EDDSA, GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE, GNUNET_MESSENGER_MessageSignature::hash, GNUNET_MESSENGER_Message::header, GNUNET_CRYPTO_SignaturePurpose::purpose, GNUNET_MESSENGER_MessageSignature::purpose, GNUNET_MESSENGER_MessageHeader::signature, GNUNET_CRYPTO_SignaturePurpose::size, and GNUNET_CRYPTO_BlindableKeySignature::type.

Referenced by sign_srv_room_message_by_peer().

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sign_message_by_key()

void sign_message_by_key	(	struct GNUNET_MESSENGER_Message *	message,
		const struct GNUNET_CRYPTO_SymmetricSessionKey *	key
	)

Signs the message body via it's own hmac with a specific shared key.

It requires the message to be of a supported kind of message which contains such an hmac.

On success the message can be verified via verify_message_by_key() afterwards.

Parameters

[in,out]	message	Message
[in]	key	Shared key

Definition at line 1456 of file messenger_api_message.c.

{
  struct GNUNET_HashCode *hmac;
 
  GNUNET_assert ((message) && (key));
 
  switch (message->header.kind)
  {
  case GNUNET_MESSENGER_KIND_ANNOUNCEMENT:
    hmac = &(message->body.announcement.hmac);
    break;
  case GNUNET_MESSENGER_KIND_ACCESS:
    hmac = &(message->body.access.hmac);
    break;
  case GNUNET_MESSENGER_KIND_REVOLUTION:
    hmac = &(message->body.revolution.hmac);
    break;
  case GNUNET_MESSENGER_KIND_AUTHORIZATION:
    hmac = &(message->body.authorization.hmac);
    break;
  default:
    hmac = NULL;
    break;
  }
 
  if (! hmac)
    return;
 
  calc_message_hmac (message, key, hmac);
}

References GNUNET_MESSENGER_MessageBody::access, GNUNET_MESSENGER_MessageBody::announcement, GNUNET_MESSENGER_MessageBody::authorization, GNUNET_MESSENGER_Message::body, calc_message_hmac(), GNUNET_assert, GNUNET_MESSENGER_KIND_ACCESS, GNUNET_MESSENGER_KIND_ANNOUNCEMENT, GNUNET_MESSENGER_KIND_AUTHORIZATION, GNUNET_MESSENGER_KIND_REVOLUTION, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageAnnouncement::hmac, GNUNET_MESSENGER_MessageAccess::hmac, GNUNET_MESSENGER_MessageRevolution::hmac, GNUNET_MESSENGER_MessageAuthorization::hmac, key, GNUNET_MESSENGER_MessageHeader::kind, and GNUNET_MESSENGER_MessageBody::revolution.

Referenced by create_message_access(), create_message_announcement(), create_message_authorization(), and create_message_revolution().

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verify_message()

enum GNUNET_GenericReturnValue verify_message	(	const struct GNUNET_MESSENGER_Message *	message,
		const struct GNUNET_HashCode *	hash,
		const struct GNUNET_CRYPTO_BlindablePublicKey *	key
	)

Verifies the signature of a given message and its hash with a specific public key.

The function returns GNUNET_OK if the signature was valid, otherwise GNUNET_SYSERR.

Parameters

[in]	message	Message
[in]	hash	Hash of message
[in]	key	Public key

Returns

GNUNET_OK on success, otherwise GNUNET_SYSERR

Definition at line 1490 of file messenger_api_message.c.

{
  struct GNUNET_MESSENGER_MessageSignature signature;
 
  GNUNET_assert ((message) && (hash) && (key));
 
  if (key->type != message->header.signature.type)
    return GNUNET_SYSERR;
 
  signature.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE);
  signature.purpose.size = htonl (sizeof(signature));
 
  GNUNET_memcpy (&(signature.hash), hash, sizeof(signature.hash));
 
  return GNUNET_CRYPTO_blinded_key_signature_verify (
    GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE, &signature,
    &(message->header.signature), key);
}

References GNUNET_assert, GNUNET_CRYPTO_blinded_key_signature_verify, GNUNET_memcpy, GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE, GNUNET_SYSERR, GNUNET_MESSENGER_MessageSignature::hash, GNUNET_MESSENGER_Message::header, key, GNUNET_CRYPTO_SignaturePurpose::purpose, GNUNET_MESSENGER_MessageSignature::purpose, GNUNET_MESSENGER_MessageHeader::signature, GNUNET_CRYPTO_SignaturePurpose::size, and GNUNET_CRYPTO_BlindableKeySignature::type.

Referenced by verify_member_session_as_sender().

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verify_message_by_peer()

enum GNUNET_GenericReturnValue verify_message_by_peer	(	const struct GNUNET_MESSENGER_Message *	message,
		const struct GNUNET_HashCode *	hash,
		const struct GNUNET_PeerIdentity *	identity
	)

Verifies the signature of a given message and its hash with a specific peer's identity.

The function returns GNUNET_OK if the signature was valid, otherwise GNUNET_SYSERR.

Parameters

[in]	message	Message
[in]	hash	Hash of message
[in]	identity	Peer identity

Returns

GNUNET_OK on success, otherwise GNUNET_SYSERR

Definition at line 1513 of file messenger_api_message.c.

{
  struct GNUNET_MESSENGER_MessageSignature signature;
 
  GNUNET_assert ((message) && (hash) && (identity));
 
  if (ntohl (GNUNET_PUBLIC_KEY_TYPE_EDDSA) != message->header.signature.type)
    return GNUNET_SYSERR;
 
  signature.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE);
  signature.purpose.size = htonl (sizeof(signature));
 
  GNUNET_memcpy (&(signature.hash), hash, sizeof(signature.hash));
 
  return GNUNET_CRYPTO_verify_peer_identity (
    GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE, &(signature.purpose),
    &(message->header.signature.
      eddsa_signature), identity);
}

References GNUNET_assert, GNUNET_CRYPTO_verify_peer_identity(), GNUNET_memcpy, GNUNET_PUBLIC_KEY_TYPE_EDDSA, GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE, GNUNET_SYSERR, GNUNET_MESSENGER_MessageSignature::hash, GNUNET_MESSENGER_Message::header, identity, GNUNET_CRYPTO_SignaturePurpose::purpose, GNUNET_MESSENGER_MessageSignature::purpose, GNUNET_MESSENGER_MessageHeader::signature, GNUNET_CRYPTO_SignaturePurpose::size, and GNUNET_CRYPTO_BlindableKeySignature::type.

Referenced by get_store_peer_of(), and verify_store_peer().

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verify_message_by_key()

enum GNUNET_GenericReturnValue verify_message_by_key	(	const struct GNUNET_MESSENGER_Message *	message,
		const struct GNUNET_CRYPTO_SymmetricSessionKey *	key
	)

Verifies the hmac of a given message body with a specific shared key.

The function returns GNUNET_OK if the signature was valid, otherwise GNUNET_SYSERR.

Parameters

[in]	message	Message
[in]	key	Shared key

Returns

GNUNET_OK on success, otherwise GNUNET_SYSERR

Definition at line 1537 of file messenger_api_message.c.

{
  const struct GNUNET_HashCode *msg_hmac;
  struct GNUNET_HashCode hmac;
 
  GNUNET_assert ((message) && (key));
 
  switch (message->header.kind)
  {
  case GNUNET_MESSENGER_KIND_ANNOUNCEMENT:
    msg_hmac = &(message->body.announcement.hmac);
    break;
  case GNUNET_MESSENGER_KIND_ACCESS:
    msg_hmac = &(message->body.access.hmac);
    break;
  case GNUNET_MESSENGER_KIND_REVOLUTION:
    msg_hmac = &(message->body.revolution.hmac);
    break;
  case GNUNET_MESSENGER_KIND_AUTHORIZATION:
    msg_hmac = &(message->body.authorization.hmac);
    break;
  default:
    msg_hmac = NULL;
    break;
  }
 
  if (! msg_hmac)
    return GNUNET_SYSERR;
 
  calc_message_hmac (message, key, &hmac);
 
  if (0 == GNUNET_CRYPTO_hash_cmp (&hmac, msg_hmac))
    return GNUNET_OK;
 
  return GNUNET_SYSERR;
}

References GNUNET_MESSENGER_MessageBody::access, GNUNET_MESSENGER_MessageBody::announcement, GNUNET_MESSENGER_MessageBody::authorization, GNUNET_MESSENGER_Message::body, calc_message_hmac(), GNUNET_assert, GNUNET_CRYPTO_hash_cmp(), GNUNET_MESSENGER_KIND_ACCESS, GNUNET_MESSENGER_KIND_ANNOUNCEMENT, GNUNET_MESSENGER_KIND_AUTHORIZATION, GNUNET_MESSENGER_KIND_REVOLUTION, GNUNET_OK, GNUNET_SYSERR, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageAnnouncement::hmac, GNUNET_MESSENGER_MessageAccess::hmac, GNUNET_MESSENGER_MessageRevolution::hmac, GNUNET_MESSENGER_MessageAuthorization::hmac, key, GNUNET_MESSENGER_MessageHeader::kind, and GNUNET_MESSENGER_MessageBody::revolution.

Referenced by extract_access_message_key(), extract_authorization_message_key(), handle_access_message(), handle_authorization_message(), handle_epoch_announcement(), handle_epoch_group_announcement(), handle_revolution_message(), and send_epoch_announcement_authorization().

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encrypt_message()

enum GNUNET_GenericReturnValue encrypt_message	(	struct GNUNET_MESSENGER_Message *	message,
		const struct GNUNET_CRYPTO_HpkePublicKey *	hpke_key
	)

Encrypts a message using a given public key and replaces its body and kind with the now private encrypted message.

The function returns GNUNET_YES if the operation succeeded, otherwise GNUNET_NO.

Parameters

[in,out]	message	Message
[in]	key	Public key

Returns

GNUNET_YES on success, otherwise GNUNET_NO

Definition at line 1577 of file messenger_api_message.c.

{
  enum GNUNET_GenericReturnValue result;
  struct GNUNET_MESSENGER_ShortMessage shortened;
  uint16_t length, padded_length, encoded_length;
  uint8_t *data;
 
  GNUNET_assert ((message) && (hpke_key));
 
  if (GNUNET_YES == is_service_message (message))
    return GNUNET_NO;
 
  fold_short_message (message, &shortened);
 
  length = get_short_message_size (&shortened, GNUNET_YES);
  padded_length = calc_padded_length (length + encryption_overhead);
 
  GNUNET_assert (padded_length >= length + encryption_overhead);
 
  message->header.kind = GNUNET_MESSENGER_KIND_PRIVATE;
  message->body.privacy.data = GNUNET_malloc (padded_length);
  message->body.privacy.length = padded_length;
 
  encoded_length = (padded_length - encryption_overhead);
 
  GNUNET_assert (padded_length == encoded_length + encryption_overhead);
 
  result = GNUNET_NO;
  data = GNUNET_malloc (encoded_length);
 
  encode_short_message (&shortened, encoded_length, (char *) data);
 
  if (GNUNET_OK != GNUNET_CRYPTO_hpke_seal_oneshot (hpke_key,
                                                    (const uint8_t*)
                                                    "messenger",
                                                    strlen ("messenger"),
                                                    NULL, 0,
                                                    (const uint8_t*) data,
                                                    encoded_length,
                                                    (uint8_t*) message->body.
                                                    privacy.data,
                                                    NULL))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Encrypting message failed!\n");
 
    unfold_short_message (&shortened, message);
    goto cleanup;
  }
 
  destroy_message_body (shortened.kind, &(shortened.body));
  result = GNUNET_YES;
 
cleanup:
  GNUNET_free (data);
  return result;
}

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_ShortMessage::body, calc_padded_length(), cleanup(), data, GNUNET_MESSENGER_MessagePrivate::data, destroy_message_body(), encode_short_message(), encryption_overhead, fold_short_message(), get_short_message_size(), GNUNET_assert, GNUNET_CRYPTO_hpke_seal_oneshot(), GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_MESSENGER_KIND_PRIVATE, GNUNET_NO, GNUNET_OK, GNUNET_YES, GNUNET_MESSENGER_Message::header, is_service_message(), GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_ShortMessage::kind, GNUNET_MESSENGER_MessagePrivate::length, GNUNET_MESSENGER_MessageBody::privacy, result, and unfold_short_message().

Referenced by dequeue_message_from_room(), and send_message_to_room_with_key().

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decrypt_message()

enum GNUNET_GenericReturnValue decrypt_message	(	struct GNUNET_MESSENGER_Message *	message,
		const struct GNUNET_CRYPTO_HpkePrivateKey *	hpke_key
	)

Decrypts a private message using a given private key and replaces its body and kind with the inner encrypted message.

The function returns GNUNET_YES if the operation succeeded, otherwise GNUNET_NO.

Parameters

[in,out]	message	Message
[in]	key	Private key

Returns

GNUNET_YES on success, otherwise GNUNET_NO

Definition at line 1637 of file messenger_api_message.c.

{
  enum GNUNET_GenericReturnValue result;
  uint16_t padded_length, encoded_length;
  uint8_t *data;
 
  GNUNET_assert ((message) && (hpke_key) &&
                 (GNUNET_MESSENGER_KIND_PRIVATE == message->header.kind));
 
  padded_length = message->body.privacy.length;
 
  if (padded_length < encryption_overhead)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Message length too short to decrypt!\n");
 
    return GNUNET_NO;
  }
 
  encoded_length = (padded_length - encryption_overhead);
 
  GNUNET_assert (padded_length == encoded_length + encryption_overhead);
 
  result = GNUNET_NO;
  data = GNUNET_malloc (encoded_length);
 
  if (GNUNET_OK !=
      GNUNET_CRYPTO_hpke_open_oneshot (hpke_key,
                                       (uint8_t*) "messenger",
                                       strlen ("messenger"),
                                       NULL, 0,
                                       (uint8_t*) message->body.privacy.data,
                                       padded_length,
                                       (uint8_t*) data,
                                       NULL))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Decrypting message failed!\n");
 
    goto cleanup;
  }
 
  {
    struct GNUNET_MESSENGER_ShortMessage shortened;
    if (GNUNET_YES != decode_short_message (&shortened,
                                            encoded_length,
                                            (char*) data))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  "Decoding decrypted message failed!\n");
 
      goto cleanup;
    }
 
    unfold_short_message (&shortened, message);
    result = GNUNET_YES;
  }
 
cleanup:
  GNUNET_free (data);
  return result;
}

References GNUNET_MESSENGER_Message::body, cleanup(), data, GNUNET_MESSENGER_MessagePrivate::data, decode_short_message(), encryption_overhead, GNUNET_assert, GNUNET_CRYPTO_hpke_open_oneshot(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_MESSENGER_KIND_PRIVATE, GNUNET_NO, GNUNET_OK, GNUNET_YES, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_MessagePrivate::length, GNUNET_MESSENGER_MessageBody::privacy, result, and unfold_short_message().

Referenced by handle_private_message().

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transcribe_message()

struct GNUNET_MESSENGER_Message * transcribe_message	(	const struct GNUNET_MESSENGER_Message *	message,
		const struct GNUNET_CRYPTO_BlindablePublicKey *	key
	)

Transcribes a message as a new transcript message using a given public key from the recipient of the encrypted message content.

Parameters

[in]	message	Message
[in]	key	Public key

Returns

Message transcript

Definition at line 1702 of file messenger_api_message.c.

{
  struct GNUNET_MESSENGER_Message *transcript;
 
  GNUNET_assert ((message) && (key));
 
  if (GNUNET_YES == is_service_message (message))
    return NULL;
 
  transcript = create_message (GNUNET_MESSENGER_KIND_TRANSCRIPT);
 
  if (! transcript)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Transcribing message failed!\n");
    return NULL;
  }
 
  GNUNET_memcpy (&(transcript->body.transcript.key), key,
                 sizeof(transcript->body.transcript.key));
 
  {
    struct GNUNET_MESSENGER_ShortMessage shortened;
    uint16_t data_length;
 
    fold_short_message (message, &shortened);
 
    data_length = get_short_message_size (&shortened, GNUNET_YES);
 
    transcript->body.transcript.data = GNUNET_malloc (data_length);
    transcript->body.transcript.length = data_length;
 
    encode_short_message (&shortened, data_length,
                          transcript->body.transcript.data);
  }
 
  return transcript;
}

References GNUNET_MESSENGER_Message::body, create_message(), GNUNET_MESSENGER_MessageTranscript::data, encode_short_message(), fold_short_message(), get_short_message_size(), GNUNET_assert, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_MESSENGER_KIND_TRANSCRIPT, GNUNET_YES, is_service_message(), key, GNUNET_MESSENGER_MessageTranscript::key, GNUNET_MESSENGER_MessageTranscript::length, and GNUNET_MESSENGER_MessageBody::transcript.

Referenced by send_message_to_room_with_key().

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encrypt_secret_message()

enum GNUNET_GenericReturnValue encrypt_secret_message	(	struct GNUNET_MESSENGER_Message *	message,
		const union GNUNET_MESSENGER_EpochIdentifier *	identifier,
		const struct GNUNET_CRYPTO_SymmetricSessionKey *	key
	)

Encrypts a message using a given shared key from an announcement of an epoch and replaces its body and kind with the inner encrypted message.

The function returns GNUNET_YES if the operation succeeded, otherwise GNUNET_NO.

Parameters

[in,out]	message	Message
[in]	identifier	Epoch identifier
[in]	key	Shared secret key

Returns

GNUNET_YES on success, otherwise GNUNET_NO

Definition at line 1743 of file messenger_api_message.c.

{
  enum GNUNET_GenericReturnValue result;
  struct GNUNET_MESSENGER_ShortMessage shortened;
  uint16_t length, padded_length;
  uint8_t *data;
 
  GNUNET_assert ((message) && (identifier) && (key));
 
  fold_short_message (message, &shortened);
 
  length = get_short_message_size (&shortened, GNUNET_YES);
  padded_length = calc_padded_length (length + 0);
 
  GNUNET_assert (padded_length >= length + 0);
 
  message->header.kind = GNUNET_MESSENGER_KIND_SECRET;
 
  GNUNET_memcpy (&(message->body.secret.identifier), identifier,
                 sizeof (message->body.secret.identifier));
 
  GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
                              &(message->body.secret.iv),
                              GNUNET_MESSENGER_SECRET_IV_BYTES);
 
  message->body.secret.data = GNUNET_malloc (padded_length);
  message->body.secret.length = padded_length;
 
  result = GNUNET_NO;
  data = GNUNET_malloc (padded_length);
 
  encode_short_message (&shortened, padded_length, (char *) data);
 
  {
    struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
 
    GNUNET_CRYPTO_symmetric_derive_iv (&iv, key,
                                       message->body.secret.iv,
                                       GNUNET_MESSENGER_SECRET_IV_BYTES,
                                       NULL);
 
    if (-1 == GNUNET_CRYPTO_symmetric_encrypt (data, padded_length, key,
                                               &iv, message->body.secret.data))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Encrypting message failed!\n");
 
      unfold_short_message (&shortened, message);
      goto cleanup;
    }
  }
 
  {
    struct GNUNET_CRYPTO_AuthKey auth_key;
 
    GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
                                   message->body.secret.iv,
                                   GNUNET_MESSENGER_SECRET_IV_BYTES,
                                   NULL);
 
    GNUNET_CRYPTO_hmac (&auth_key, data, padded_length, &(message->body.secret.
                                                          hmac));
  }
 
  destroy_message_body (shortened.kind, &(shortened.body));
  result = GNUNET_YES;
 
cleanup:
  GNUNET_free (data);
  return result;
}

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_ShortMessage::body, calc_padded_length(), cleanup(), data, GNUNET_MESSENGER_MessageSecret::data, destroy_message_body(), encode_short_message(), fold_short_message(), get_short_message_size(), GNUNET_assert, GNUNET_CRYPTO_hmac(), GNUNET_CRYPTO_hmac_derive_key(), GNUNET_CRYPTO_QUALITY_NONCE, GNUNET_CRYPTO_random_block(), GNUNET_CRYPTO_symmetric_derive_iv(), GNUNET_CRYPTO_symmetric_encrypt(), GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_MESSENGER_KIND_SECRET, GNUNET_MESSENGER_SECRET_IV_BYTES, GNUNET_NO, GNUNET_YES, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageSecret::identifier, GNUNET_MESSENGER_MessageSecret::iv, key, GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_ShortMessage::kind, GNUNET_MESSENGER_MessageSecret::length, result, GNUNET_MESSENGER_MessageBody::secret, and unfold_short_message().

Referenced by send_message_to_room().

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decrypt_secret_message()

enum GNUNET_GenericReturnValue decrypt_secret_message	(	struct GNUNET_MESSENGER_Message *	message,
		const struct GNUNET_CRYPTO_SymmetricSessionKey *	key
	)

Decrypts a secret message using a given shared key and replaces its body and kind with the inner encrypted message.

The function returns GNUNET_YES if the operation succeeded, otherwise GNUNET_NO.

Parameters

[in,out]	message	Message
[in]	key	Shared secret key

Returns

GNUNET_YES on success, otherwise GNUNET_NO

Definition at line 1819 of file messenger_api_message.c.

{
  enum GNUNET_GenericReturnValue result;
  uint16_t padded_length;
  uint8_t *data;
 
  GNUNET_assert ((message) && (key) &&
                 (GNUNET_MESSENGER_KIND_SECRET == message->header.kind));
 
  padded_length = message->body.secret.length;
 
  result = GNUNET_NO;
  data = GNUNET_malloc (padded_length);
 
  {
    struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
 
    GNUNET_CRYPTO_symmetric_derive_iv (&iv, key,
                                       message->body.secret.iv,
                                       GNUNET_MESSENGER_SECRET_IV_BYTES,
                                       NULL);
 
    if (-1 == GNUNET_CRYPTO_symmetric_decrypt (message->body.secret.data,
                                               padded_length,
                                               key, &iv, data))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Decrypting message failed!\n");
 
      goto cleanup;
    }
  }
 
  {
    struct GNUNET_CRYPTO_AuthKey auth_key;
    struct GNUNET_HashCode hmac;
 
    GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
                                   message->body.secret.iv,
                                   GNUNET_MESSENGER_SECRET_IV_BYTES,
                                   NULL);
 
    GNUNET_CRYPTO_hmac (&auth_key, data, padded_length, &hmac);
 
    if (0 != GNUNET_CRYPTO_hash_cmp (&(message->body.secret.hmac), &hmac))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  "Decrypted message does not match HMAC!\n");
 
      goto cleanup;
    }
  }
 
  {
    struct GNUNET_MESSENGER_ShortMessage shortened;
    if (GNUNET_YES != decode_short_message (&shortened,
                                            padded_length,
                                            (char*) data))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  "Decoding decrypted message failed!\n");
 
      goto cleanup;
    }
 
    unfold_short_message (&shortened, message);
    result = GNUNET_YES;
  }
 
cleanup:
  GNUNET_free (data);
  return result;
}

References GNUNET_MESSENGER_Message::body, cleanup(), data, GNUNET_MESSENGER_MessageSecret::data, decode_short_message(), GNUNET_assert, GNUNET_CRYPTO_hash_cmp(), GNUNET_CRYPTO_hmac(), GNUNET_CRYPTO_hmac_derive_key(), GNUNET_CRYPTO_symmetric_decrypt(), GNUNET_CRYPTO_symmetric_derive_iv(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_MESSENGER_KIND_SECRET, GNUNET_MESSENGER_SECRET_IV_BYTES, GNUNET_NO, GNUNET_YES, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageSecret::hmac, GNUNET_MESSENGER_MessageSecret::iv, key, GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_MessageSecret::length, result, GNUNET_MESSENGER_MessageBody::secret, and unfold_short_message().

Referenced by update_room_secret_message().

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read_transcript_message()

enum GNUNET_GenericReturnValue read_transcript_message

(

struct GNUNET_MESSENGER_Message *

message

)

Read the original message from a transcript message and replaces its body and kind with the inner encrypted message.

The function returns GNUNET_YES if the operation succeeded, otherwise GNUNET_NO.

Parameters

[in,out]

message

Message transcript

Returns

GNUNET_YES on success, otherwise GNUNET_NO

Definition at line 1895 of file messenger_api_message.c.

{
  uint16_t data_length;
  struct GNUNET_MESSENGER_ShortMessage shortened;
 
  GNUNET_assert ((message) &&
                 (GNUNET_MESSENGER_KIND_TRANSCRIPT == message->header.kind));
 
  data_length = message->body.transcript.length;
 
  if (GNUNET_YES != decode_short_message (&shortened,
                                          data_length,
                                          message->body.transcript.data))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Decoding decrypted message failed!\n");
 
    return GNUNET_NO;
  }
 
  unfold_short_message (&shortened, message);
  return GNUNET_YES;
}

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_MessageTranscript::data, decode_short_message(), GNUNET_assert, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_MESSENGER_KIND_TRANSCRIPT, GNUNET_NO, GNUNET_YES, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_MessageTranscript::length, GNUNET_MESSENGER_MessageBody::transcript, and unfold_short_message().

Referenced by handle_transcript_message().

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extract_access_message_key()

enum GNUNET_GenericReturnValue extract_access_message_key	(	const struct GNUNET_MESSENGER_Message *	message,
		const struct GNUNET_CRYPTO_HpkePrivateKey *	key,
		struct GNUNET_CRYPTO_SymmetricSessionKey *	shared_key
	)

Extracts the shared epoch or group key from an access message using the private ephemeral key from an epoch and verifies it via the HMAC from the message body.

The function returns GNUNET_YES if the operation succeeded, otherwise GNUNET_NO.

Parameters

[in]	message	Access message
[in]	key	Private ephemeral key
[out]	shared_key	Shared key

Returns

GNUNET_YES on success, otherwise GNUNET_NO

Definition at line 1921 of file messenger_api_message.c.

{
  GNUNET_assert ((message) && (key) && (shared_key) &&
                 (GNUNET_MESSENGER_KIND_ACCESS == message->header.kind));
 
  if (GNUNET_OK !=
      GNUNET_CRYPTO_hpke_open_oneshot (key,
                                       (uint8_t*) "messenger",
                                       strlen ("messenger"),
                                       NULL, 0,
                                       (uint8_t*) message->body.access.key,
                                       GNUNET_MESSENGER_ACCESS_KEY_BYTES,
                                       (uint8_t*) shared_key,
                                       NULL))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Decrypting shared key failed!\n");
    return GNUNET_NO;
  }
 
  if (GNUNET_OK != verify_message_by_key (message, shared_key))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Shared key mismatches HMAC!\n");
    return GNUNET_NO;
  }
 
  return GNUNET_YES;
}

References GNUNET_MESSENGER_MessageBody::access, GNUNET_MESSENGER_Message::body, GNUNET_assert, GNUNET_CRYPTO_hpke_open_oneshot(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_MESSENGER_ACCESS_KEY_BYTES, GNUNET_MESSENGER_KIND_ACCESS, GNUNET_NO, GNUNET_OK, GNUNET_YES, GNUNET_MESSENGER_Message::header, key, GNUNET_MESSENGER_MessageAccess::key, GNUNET_MESSENGER_MessageHeader::kind, and verify_message_by_key().

Referenced by handle_epoch_announcement_access(), and handle_epoch_group_access().

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extract_authorization_message_key()

enum GNUNET_GenericReturnValue extract_authorization_message_key	(	struct GNUNET_MESSENGER_Message *	message,
		const struct GNUNET_CRYPTO_SymmetricSessionKey *	key,
		struct GNUNET_CRYPTO_SymmetricSessionKey *	shared_key
	)

Extracts the shared epoch or group key from an authorization message using a previously exchanged shared key and verifies it via the HMAC from the message body.

The function returns GNUNET_YES if the operation succeeded, otherwise GNUNET_NO.

Parameters

[in]	message	Access message
[in]	key	Previous shared key
[out]	shared_key	Shared key

Returns

GNUNET_YES on success, otherwise GNUNET_NO

Definition at line 1954 of file messenger_api_message.c.

{
  struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
 
  GNUNET_assert ((message) && (key) && (shared_key) &&
                 (GNUNET_MESSENGER_KIND_AUTHORIZATION == message->header.kind));
 
  GNUNET_CRYPTO_symmetric_derive_iv (&iv, key,
                                     &(message->body.authorization.event),
                                     sizeof (message->body.authorization.event),
                                     &(message->body.authorization.identifier),
                                     sizeof (message->body.authorization.
                                             identifier),
                                     NULL);
 
  if (-1 == GNUNET_CRYPTO_symmetric_decrypt (message->body.authorization.key,
                                             GNUNET_MESSENGER_AUTHORIZATION_KEY_BYTES,
                                             key,
                                             &iv,
                                             shared_key))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Decrypting shared key failed!\n");
    return GNUNET_NO;
  }
 
  if (GNUNET_OK != verify_message_by_key (message, shared_key))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Shared key mismatches HMAC!\n");
    return GNUNET_NO;
  }
 
  return GNUNET_YES;
}

References GNUNET_MESSENGER_MessageBody::authorization, GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_MessageAuthorization::event, GNUNET_assert, GNUNET_CRYPTO_symmetric_decrypt(), GNUNET_CRYPTO_symmetric_derive_iv(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_MESSENGER_AUTHORIZATION_KEY_BYTES, GNUNET_MESSENGER_KIND_AUTHORIZATION, GNUNET_NO, GNUNET_OK, GNUNET_YES, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageAuthorization::identifier, key, GNUNET_MESSENGER_MessageAuthorization::key, GNUNET_MESSENGER_MessageHeader::kind, and verify_message_by_key().

Referenced by handle_authorization_message().

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get_message_timeout()

struct GNUNET_TIME_Relative get_message_timeout

(

const struct GNUNET_MESSENGER_Message *

message

)

Return the relative timeout of the content from a given message that controls when a delayed handling action of this message needs to be processed at least.

Parameters

[in]

message

Message

Returns

Relative timeout of message

Definition at line 1994 of file messenger_api_message.c.

{
  struct GNUNET_TIME_Absolute timestamp;
  struct GNUNET_TIME_Relative timeout;
 
  GNUNET_assert (message);
 
  timestamp = GNUNET_TIME_absolute_ntoh (message->header.timestamp);
 
  switch (message->header.kind)
  {
  case GNUNET_MESSENGER_KIND_DELETION:
    timeout = GNUNET_TIME_relative_ntoh (message->body.deletion.delay);
    break;
  case GNUNET_MESSENGER_KIND_ANNOUNCEMENT:
    timeout = GNUNET_TIME_relative_ntoh (message->body.announcement.timeout);
    break;
  case GNUNET_MESSENGER_KIND_APPEAL:
    timeout = GNUNET_TIME_relative_ntoh (message->body.appeal.timeout);
    break;
  case GNUNET_MESSENGER_KIND_GROUP:
    timeout = GNUNET_TIME_relative_ntoh (message->body.group.timeout);
    break;
  default:
    timeout = GNUNET_TIME_relative_get_zero_ ();
    break;
  }
 
  timestamp = GNUNET_TIME_absolute_add (timestamp, timeout);
 
  timeout = GNUNET_TIME_absolute_get_remaining (timestamp);
  timeout = GNUNET_TIME_relative_min (timeout,
                                      GNUNET_TIME_relative_get_minute_ ());
 
  return timeout;
}

References GNUNET_assert, GNUNET_MESSENGER_KIND_ANNOUNCEMENT, GNUNET_MESSENGER_KIND_APPEAL, GNUNET_MESSENGER_KIND_DELETION, GNUNET_MESSENGER_KIND_GROUP, GNUNET_TIME_absolute_add(), GNUNET_TIME_absolute_get_remaining(), GNUNET_TIME_absolute_ntoh(), GNUNET_TIME_relative_get_minute_(), GNUNET_TIME_relative_get_zero_(), GNUNET_TIME_relative_min(), GNUNET_TIME_relative_ntoh(), timeout, and timestamp().

Referenced by handle_appeal_message(), handle_delete_message(), handle_epoch_announcement(), handle_epoch_announcement_delay(), handle_message_delete(), handle_room_delayed_deletion(), and set_epoch_proposal_group().

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pack_message()

struct GNUNET_MQ_Envelope * pack_message	(	struct GNUNET_MESSENGER_Message *	message,
		struct GNUNET_HashCode *	hash,
		const GNUNET_MESSENGER_SignFunction	sign,
		enum GNUNET_MESSENGER_PackMode	mode,
		const void *	cls
	)

Encodes the message to pack it into a newly allocated envelope if mode is equal to GNUNET_MESSENGER_PACK_MODE_ENVELOPE.

Independent of the mode the message will be hashed if hash is not NULL and it will be signed if the sign function is not NULL.

Parameters

[out]	message	Message
[out]	hash	Hash of message
[in]	sign	Function to sign
[in]	mode	Mode of packing
[in,out]	cls	Closure for signing

Returns

Envelope or NULL

Definition at line 2033 of file messenger_api_message.c.

{
  struct GNUNET_MessageHeader *header;
  uint16_t length, padded_length;
  struct GNUNET_MQ_Envelope *env;
  char *buffer;
 
  GNUNET_assert (message);
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Packing message kind=%u and sender: %s\n",
              message->header.kind, GNUNET_sh2s (&(message->header.sender_id)));
 
  length = get_message_size (message, GNUNET_YES);
  padded_length = calc_padded_length (length);
 
  if (GNUNET_MESSENGER_PACK_MODE_ENVELOPE == mode)
  {
    env = GNUNET_MQ_msg_extra (header, padded_length,
                               GNUNET_MESSAGE_TYPE_CADET_CLI);
    buffer = (char*) &(header[1]);
  }
  else
  {
    env = NULL;
    buffer = GNUNET_malloc (padded_length);
  }
 
  encode_message (message, padded_length, buffer, GNUNET_YES);
 
  if (hash)
  {
    hash_message (message, length, buffer, hash);
 
    if (sign)
      sign (cls, message, length, buffer, hash);
  }
 
  if (GNUNET_MESSENGER_PACK_MODE_ENVELOPE != mode)
    GNUNET_free (buffer);
 
  return env;
}

References calc_padded_length(), encode_message(), env, get_message_size(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_MESSAGE_TYPE_CADET_CLI, GNUNET_MESSENGER_PACK_MODE_ENVELOPE, GNUNET_MQ_msg_extra, GNUNET_sh2s(), GNUNET_YES, hash_message(), GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageHeader::kind, mode, and GNUNET_MESSENGER_MessageHeader::sender_id.

Referenced by forward_tunnel_message(), iterate_send_room_message(), and pack_srv_room_message().

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is_peer_message()

enum GNUNET_GenericReturnValue is_peer_message

(

const struct GNUNET_MESSENGER_Message *

message

)

Returns whether a specific kind of message can be sent by the service without usage of a clients private key.

The function returns GNUNET_YES if the kind of message can be signed via a peer's identity, otherwise GNUNET_NO.

Parameters

[in]

message

Message

Returns

GNUNET_YES if sending is allowed, GNUNET_NO otherwise

Definition at line 2083 of file messenger_api_message.c.

{
  GNUNET_assert (message);
 
  switch (message->header.kind)
  {
  case GNUNET_MESSENGER_KIND_INFO:
  case GNUNET_MESSENGER_KIND_PEER:
  case GNUNET_MESSENGER_KIND_MISS:
  case GNUNET_MESSENGER_KIND_MERGE:
  case GNUNET_MESSENGER_KIND_CONNECTION:
    return GNUNET_YES;
  default:
    return GNUNET_NO;
  }
}

References GNUNET_assert, GNUNET_MESSENGER_KIND_CONNECTION, GNUNET_MESSENGER_KIND_INFO, GNUNET_MESSENGER_KIND_MERGE, GNUNET_MESSENGER_KIND_MISS, GNUNET_MESSENGER_KIND_PEER, GNUNET_NO, GNUNET_YES, GNUNET_MESSENGER_Message::header, and GNUNET_MESSENGER_MessageHeader::kind.

Referenced by callback_found_message(), callback_room_handle_message(), enqueue_message_control(), filter_message_sending(), get_store_member_of(), get_store_peer_of(), handle_room_messages(), is_service_message(), notify_about_members(), notify_srv_handle_message(), pack_srv_room_message(), process_message_control(), and task_message_control().

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is_service_message()

enum GNUNET_GenericReturnValue is_service_message

(

const struct GNUNET_MESSENGER_Message *

message

)

Returns whether a specific kind of message contains service critical information.

That kind of information should not be encrypted via private messages for example to guarantee the service to work properly. The function returns GNUNET_YES if the kind of message needs to be transferred accessible to all peers and their running service. It returns GNUNET_NO if the message can be encrypted to specific subgroups of members without issues. If the kind of message is unknown it returns GNUNET_SYSERR.

Parameters

[in]

message

Message

Returns

GNUNET_YES if encrypting is disallowed, GNUNET_NO or GNUNET_SYSERR otherwise

Definition at line 2102 of file messenger_api_message.c.

{
  GNUNET_assert (message);
 
  if (GNUNET_YES == is_peer_message (message))
    return GNUNET_YES;
 
  switch (message->header.kind)
  {
  case GNUNET_MESSENGER_KIND_INFO:
    return GNUNET_YES; // Reserved for connection handling only!
  case GNUNET_MESSENGER_KIND_JOIN:
    return GNUNET_YES; // Reserved for member handling only!
  case GNUNET_MESSENGER_KIND_LEAVE:
    return GNUNET_YES; // Reserved for member handling only!
  case GNUNET_MESSENGER_KIND_NAME:
    return GNUNET_YES; // Reserved for member name handling only!
  case GNUNET_MESSENGER_KIND_KEY:
    return GNUNET_YES; // Reserved for member key handling only!
  case GNUNET_MESSENGER_KIND_PEER:
    return GNUNET_YES; // Reserved for connection handling only!
  case GNUNET_MESSENGER_KIND_ID:
    return GNUNET_YES; // Reserved for member id handling only!
  case GNUNET_MESSENGER_KIND_MISS:
    return GNUNET_YES; // Reserved for connection handling only!
  case GNUNET_MESSENGER_KIND_MERGE:
    return GNUNET_YES; // Reserved for peers only!
  case GNUNET_MESSENGER_KIND_REQUEST:
    return GNUNET_YES; // Requests should not apply individually! (inefficiently)
  case GNUNET_MESSENGER_KIND_INVITE:
    return GNUNET_NO;
  case GNUNET_MESSENGER_KIND_TEXT:
    return GNUNET_NO;
  case GNUNET_MESSENGER_KIND_FILE:
    return GNUNET_NO;
  case GNUNET_MESSENGER_KIND_PRIVATE:
    return GNUNET_YES; // Prevent duplicate encryption breaking all access!
  case GNUNET_MESSENGER_KIND_DELETION:
    return GNUNET_YES; // Deletion should not apply individually! (inefficiently)
  case GNUNET_MESSENGER_KIND_CONNECTION:
    return GNUNET_YES; // Reserved for connection handling only!
  case GNUNET_MESSENGER_KIND_TICKET:
    return GNUNET_NO;
  case GNUNET_MESSENGER_KIND_TRANSCRIPT:
    return GNUNET_NO;
  case GNUNET_MESSENGER_KIND_TAG:
    return GNUNET_NO;
  case GNUNET_MESSENGER_KIND_SUBSCRIBTION:
    return GNUNET_YES; // Reserved for subscription handling only!
  case GNUNET_MESSENGER_KIND_TALK:
    return GNUNET_NO;
  case GNUNET_MESSENGER_KIND_ANNOUNCEMENT:
    return GNUNET_YES; // Reserved for epoch and group key exchange!
  case GNUNET_MESSENGER_KIND_SECRET:
    return GNUNET_YES; // Prevent duplicate encryption breaking all access!
  case GNUNET_MESSENGER_KIND_APPEAL:
    return GNUNET_YES; // Reserved for epoch key exchange!
  case GNUNET_MESSENGER_KIND_ACCESS:
    return GNUNET_YES; // Reserved for epoch and group key exchange!
  case GNUNET_MESSENGER_KIND_REVOLUTION:
    return GNUNET_YES; // Reserved for epoch and group key revoking!
  case GNUNET_MESSENGER_KIND_GROUP:
    return GNUNET_YES; // Reserved for group key exchange!
  case GNUNET_MESSENGER_KIND_AUTHORIZATION:
    return GNUNET_YES; // Reserved for epoch and group key exchange!
  default:
    return GNUNET_SYSERR;
  }
}

References GNUNET_assert, GNUNET_MESSENGER_KIND_ACCESS, GNUNET_MESSENGER_KIND_ANNOUNCEMENT, GNUNET_MESSENGER_KIND_APPEAL, GNUNET_MESSENGER_KIND_AUTHORIZATION, GNUNET_MESSENGER_KIND_CONNECTION, GNUNET_MESSENGER_KIND_DELETION, GNUNET_MESSENGER_KIND_FILE, GNUNET_MESSENGER_KIND_GROUP, GNUNET_MESSENGER_KIND_ID, GNUNET_MESSENGER_KIND_INFO, GNUNET_MESSENGER_KIND_INVITE, GNUNET_MESSENGER_KIND_JOIN, GNUNET_MESSENGER_KIND_KEY, GNUNET_MESSENGER_KIND_LEAVE, GNUNET_MESSENGER_KIND_MERGE, GNUNET_MESSENGER_KIND_MISS, GNUNET_MESSENGER_KIND_NAME, GNUNET_MESSENGER_KIND_PEER, GNUNET_MESSENGER_KIND_PRIVATE, GNUNET_MESSENGER_KIND_REQUEST, GNUNET_MESSENGER_KIND_REVOLUTION, GNUNET_MESSENGER_KIND_SECRET, GNUNET_MESSENGER_KIND_SUBSCRIBTION, GNUNET_MESSENGER_KIND_TAG, GNUNET_MESSENGER_KIND_TALK, GNUNET_MESSENGER_KIND_TEXT, GNUNET_MESSENGER_KIND_TICKET, GNUNET_MESSENGER_KIND_TRANSCRIPT, GNUNET_NO, GNUNET_SYSERR, GNUNET_YES, GNUNET_MESSENGER_Message::header, is_peer_message(), and GNUNET_MESSENGER_MessageHeader::kind.

Referenced by encrypt_message(), send_message_to_room(), and transcribe_message().

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is_epoch_message()

enum GNUNET_GenericReturnValue is_epoch_message

(

const struct GNUNET_MESSENGER_Message *

message

)

Returns whether a certain kind of message from storage contains some specific details that might be required for the overall message graph to function as intended.

The function returns GNUNET_YES if you may not delete the given message because of that, otherwise it returns GNUNET_NO.

Parameters

[in]

message

Message

Returns

GNUNET_YES if the message contains epoch graph information, GNUNET_NO otherwise

Definition at line 2174 of file messenger_api_message.c.

{
  GNUNET_assert (message);
 
  switch (message->header.kind)
  {
  case GNUNET_MESSENGER_KIND_JOIN:
    return GNUNET_YES;
  case GNUNET_MESSENGER_KIND_LEAVE:
    return GNUNET_YES;
  case GNUNET_MESSENGER_KIND_MERGE:
    return GNUNET_YES;
  default:
    return GNUNET_NO;
  }
}

References GNUNET_assert, GNUNET_MESSENGER_KIND_JOIN, GNUNET_MESSENGER_KIND_LEAVE, GNUNET_MESSENGER_KIND_MERGE, GNUNET_NO, GNUNET_YES, GNUNET_MESSENGER_Message::header, and GNUNET_MESSENGER_MessageHeader::kind.

Referenced by delete_store_message(), GNUNET_MESSENGER_delete_message(), handle_message(), pack_srv_room_message(), request_room_message_step(), and send_message_to_room().

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filter_message_sending()

enum GNUNET_GenericReturnValue filter_message_sending

(

const struct GNUNET_MESSENGER_Message *

message

)

Returns whether a specific kind of message should be sent by a client.

The function returns GNUNET_YES or GNUNET_NO for recommendations and GNUNET_SYSERR for specific kinds of messages which should not be sent manually at all.

Parameters

[in]

message

Message

Returns

GNUNET_YES if sending is allowed, GNUNET_NO or GNUNET_SYSERR otherwise

Definition at line 2193 of file messenger_api_message.c.

{
  GNUNET_assert (message);
 
  if (GNUNET_YES == is_peer_message (message))
    return GNUNET_SYSERR; // Requires signature of peer rather than member!
 
  switch (message->header.kind)
  {
  case GNUNET_MESSENGER_KIND_INFO:
    return GNUNET_SYSERR; // Reserved for connection handling only!
  case GNUNET_MESSENGER_KIND_JOIN:
    return GNUNET_NO; // Use #GNUNET_MESSENGER_enter_room(...) instead!
  case GNUNET_MESSENGER_KIND_LEAVE:
    return GNUNET_NO; // Use #GNUNET_MESSENGER_close_room(...) instead!
  case GNUNET_MESSENGER_KIND_NAME:
    return GNUNET_YES;
  case GNUNET_MESSENGER_KIND_KEY:
    return GNUNET_NO; // Use #GNUNET_MESSENGER_set_key(...) instead!
  case GNUNET_MESSENGER_KIND_PEER:
    return GNUNET_SYSERR; // Use #GNUNET_MESSENGER_open_room(...) instead!
  case GNUNET_MESSENGER_KIND_ID:
    return GNUNET_NO; // Reserved for member id handling only!
  case GNUNET_MESSENGER_KIND_MISS:
    return GNUNET_SYSERR; // Reserved for connection handling only!
  case GNUNET_MESSENGER_KIND_MERGE:
    return GNUNET_SYSERR; // Reserved for peers only!
  case GNUNET_MESSENGER_KIND_REQUEST:
    return GNUNET_NO; // Use #GNUNET_MESSENGER_get_message(...) instead!
  case GNUNET_MESSENGER_KIND_INVITE:
    return GNUNET_YES;
  case GNUNET_MESSENGER_KIND_TEXT:
    return GNUNET_YES;
  case GNUNET_MESSENGER_KIND_FILE:
    return GNUNET_YES;
  case GNUNET_MESSENGER_KIND_PRIVATE:
    return GNUNET_NO; // Use #GNUNET_MESSENGER_send_message(...) with a contact instead!
  case GNUNET_MESSENGER_KIND_DELETION:
    return GNUNET_NO; // Use #GNUNET_MESSENGER_delete_message(...) instead!
  case GNUNET_MESSENGER_KIND_CONNECTION:
    return GNUNET_SYSERR; // Reserved for connection handling only!
  case GNUNET_MESSENGER_KIND_TICKET:
    return GNUNET_YES;
  case GNUNET_MESSENGER_KIND_TRANSCRIPT:
    return GNUNET_NO; // Use #GNUNET_MESSENGER_send_message(...) with a contact instead!
  case GNUNET_MESSENGER_KIND_TAG:
    return GNUNET_YES;
  case GNUNET_MESSENGER_KIND_SUBSCRIBTION:
    return GNUNET_YES;
  case GNUNET_MESSENGER_KIND_TALK:
    return GNUNET_YES;
  case GNUNET_MESSENGER_KIND_ANNOUNCEMENT:
    return GNUNET_NO; // Should only be used for implicit key exchange!
  case GNUNET_MESSENGER_KIND_SECRET:
    return GNUNET_NO; // Should only be used for implicit forward secrecy!
  case GNUNET_MESSENGER_KIND_APPEAL:
    return GNUNET_NO; // Should only be used for implicit key exchange!
  case GNUNET_MESSENGER_KIND_ACCESS:
    return GNUNET_NO; // Should only be used for implicit key exchange!
  case GNUNET_MESSENGER_KIND_REVOLUTION:
    return GNUNET_NO; // Should only be used for implicit key exchange!
  case GNUNET_MESSENGER_KIND_GROUP:
    return GNUNET_NO; // Should only be used for implicit key exchange!
  case GNUNET_MESSENGER_KIND_AUTHORIZATION:
    return GNUNET_NO; // Should only be used for implicit key exchange!
  default:
    return GNUNET_SYSERR;
  }
}

References GNUNET_assert, GNUNET_MESSENGER_KIND_ACCESS, GNUNET_MESSENGER_KIND_ANNOUNCEMENT, GNUNET_MESSENGER_KIND_APPEAL, GNUNET_MESSENGER_KIND_AUTHORIZATION, GNUNET_MESSENGER_KIND_CONNECTION, GNUNET_MESSENGER_KIND_DELETION, GNUNET_MESSENGER_KIND_FILE, GNUNET_MESSENGER_KIND_GROUP, GNUNET_MESSENGER_KIND_ID, GNUNET_MESSENGER_KIND_INFO, GNUNET_MESSENGER_KIND_INVITE, GNUNET_MESSENGER_KIND_JOIN, GNUNET_MESSENGER_KIND_KEY, GNUNET_MESSENGER_KIND_LEAVE, GNUNET_MESSENGER_KIND_MERGE, GNUNET_MESSENGER_KIND_MISS, GNUNET_MESSENGER_KIND_NAME, GNUNET_MESSENGER_KIND_PEER, GNUNET_MESSENGER_KIND_PRIVATE, GNUNET_MESSENGER_KIND_REQUEST, GNUNET_MESSENGER_KIND_REVOLUTION, GNUNET_MESSENGER_KIND_SECRET, GNUNET_MESSENGER_KIND_SUBSCRIBTION, GNUNET_MESSENGER_KIND_TAG, GNUNET_MESSENGER_KIND_TALK, GNUNET_MESSENGER_KIND_TEXT, GNUNET_MESSENGER_KIND_TICKET, GNUNET_MESSENGER_KIND_TRANSCRIPT, GNUNET_NO, GNUNET_SYSERR, GNUNET_YES, GNUNET_MESSENGER_Message::header, is_peer_message(), and GNUNET_MESSENGER_MessageHeader::kind.

Referenced by check_send_message(), and GNUNET_MESSENGER_send_message().

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get_message_discourse()

const struct GNUNET_ShortHashCode * get_message_discourse

(

const struct GNUNET_MESSENGER_Message *

message

)

Returns the discourse hash of a message depending on its kind.

If a message contains a discourse hash it will not be stored locally on peers.

Parameters

[in]

message

Message

Returns

Discourse hash of message or NULL

Definition at line 2265 of file messenger_api_message.c.

{
  GNUNET_assert (message);
 
  switch (message->header.kind)
  {
  case GNUNET_MESSENGER_KIND_SUBSCRIBTION:
    return &(message->body.subscription.discourse);
  case GNUNET_MESSENGER_KIND_TALK:
    return &(message->body.talk.discourse);
  default:
    return NULL;
  }
}

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_MessageSubscribtion::discourse, GNUNET_MESSENGER_MessageTalk::discourse, GNUNET_assert, GNUNET_MESSENGER_KIND_SUBSCRIBTION, GNUNET_MESSENGER_KIND_TALK, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_MessageBody::subscription, and GNUNET_MESSENGER_MessageBody::talk.

Referenced by handle_message_control(), iterate_flag_for_cleanup_discourse_message(), put_store_message(), send_message_to_room(), and update_message_state().

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