GNUnet  0.17.6
Data Structures | Macros | Typedefs | Functions
messenger_api_message.c File Reference

messenger api: client and service implementation of GNUnet MESSENGER service More...

#include "messenger_api_message.h"
Include dependency graph for messenger_api_message.c:

Go to the source code of this file.

Data Structures

struct  GNUNET_MESSENGER_MessageSignature
 
struct  GNUNET_MESSENGER_ShortMessage
 

Macros

#define member_size(type, member)   sizeof(((type*) NULL)->member)
 
#define max(x, y)   (x > y? x : y)
 
#define min(x, y)   (x < y? x : y)
 
#define encode_step_ext(dst, offset, src, size)
 
#define encode_step(dst, offset, src)
 
#define encode_step_key(dst, offset, src, length)
 
#define encode_step_signature(dst, offset, src, length)
 
#define decode_step_ext(src, offset, dst, size)
 
#define decode_step(src, offset, dst)
 
#define decode_step_malloc(src, offset, dst, size, zero)
 
#define decode_step_key(src, offset, dst, length)
 

Typedefs

typedef uint32_t kind_t
 

Functions

struct GNUNET_MESSENGER_Messagecreate_message (enum GNUNET_MESSENGER_MessageKind kind)
 Creates and allocates a new message with a specific kind. More...
 
struct GNUNET_MESSENGER_Messagecopy_message (const struct GNUNET_MESSENGER_Message *message)
 Creates and allocates a copy of a given message. More...
 
static void destroy_message_body (enum GNUNET_MESSENGER_MessageKind kind, struct GNUNET_MESSENGER_MessageBody *body)
 
void cleanup_message (struct GNUNET_MESSENGER_Message *message)
 Frees the messages body memory. More...
 
void destroy_message (struct GNUNET_MESSENGER_Message *message)
 Destroys a message and frees its memory fully. More...
 
int is_message_session_bound (const struct GNUNET_MESSENGER_Message *message)
 Returns if the message should be bound to a member session. More...
 
static void fold_short_message (const struct GNUNET_MESSENGER_Message *message, struct GNUNET_MESSENGER_ShortMessage *shortened)
 
static void unfold_short_message (struct GNUNET_MESSENGER_ShortMessage *shortened, struct GNUNET_MESSENGER_Message *message)
 
static uint16_t get_message_body_kind_size (enum GNUNET_MESSENGER_MessageKind kind)
 
uint16_t get_message_kind_size (enum GNUNET_MESSENGER_MessageKind kind, int include_header)
 Returns the minimal size in bytes to encode a message of a specific kind. More...
 
static uint16_t get_message_body_size (enum GNUNET_MESSENGER_MessageKind kind, const struct GNUNET_MESSENGER_MessageBody *body)
 
uint16_t get_message_size (const struct GNUNET_MESSENGER_Message *message, int include_header)
 Returns the exact size in bytes to encode a given message. More...
 
static uint16_t get_short_message_size (const struct GNUNET_MESSENGER_ShortMessage *message, int include_body)
 
static uint16_t calc_usual_padding ()
 
static uint16_t calc_padded_length (uint16_t length)
 
static void encode_message_body (enum GNUNET_MESSENGER_MessageKind kind, const struct GNUNET_MESSENGER_MessageBody *body, uint16_t length, char *buffer, uint16_t offset)
 
void encode_message (const struct GNUNET_MESSENGER_Message *message, uint16_t length, char *buffer, int include_header)
 Encodes a given message into a buffer of a maximal length in bytes. More...
 
static void encode_short_message (const struct GNUNET_MESSENGER_ShortMessage *message, uint16_t length, char *buffer)
 
static uint16_t decode_message_body (enum GNUNET_MESSENGER_MessageKind *kind, struct GNUNET_MESSENGER_MessageBody *body, uint16_t length, const char *buffer, uint16_t offset)
 
int decode_message (struct GNUNET_MESSENGER_Message *message, uint16_t length, const char *buffer, int include_header, uint16_t *padding)
 Decodes a message from a given buffer of a maximal length in bytes. More...
 
static int decode_short_message (struct GNUNET_MESSENGER_ShortMessage *message, uint16_t length, const char *buffer)
 
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. More...
 
void sign_message (struct GNUNET_MESSENGER_Message *message, uint16_t length, char *buffer, const struct GNUNET_HashCode *hash, const struct GNUNET_MESSENGER_Ego *ego)
 Signs the hash of a message with a given ego and writes the signature into the buffer as well. More...
 
int verify_message (const struct GNUNET_MESSENGER_Message *message, const struct GNUNET_HashCode *hash, const struct GNUNET_IDENTITY_PublicKey *key)
 Verifies the signature of a given message and its hash with a specific public key. More...
 
int encrypt_message (struct GNUNET_MESSENGER_Message *message, const struct GNUNET_IDENTITY_PublicKey *key)
 Encrypts a message using a given public key and replaces its body and kind with the now private encrypted message. More...
 
int decrypt_message (struct GNUNET_MESSENGER_Message *message, const struct GNUNET_IDENTITY_PrivateKey *key)
 Decrypts a private message using a given private key and replaces its body and kind with the inner encrypted message. More...
 
struct GNUNET_MQ_Envelopepack_message (struct GNUNET_MESSENGER_Message *message, struct GNUNET_HashCode *hash, const struct GNUNET_MESSENGER_Ego *ego, int mode)
 Encodes the message to pack it into a newly allocated envelope if mode is equal to GNUNET_MESSENGER_PACK_MODE_ENVELOPE. More...
 
int filter_message_sending (const struct GNUNET_MESSENGER_Message *message)
 Returns if a specific kind of message should be sent by a client. More...
 

Detailed Description

messenger api: client and service implementation of GNUnet MESSENGER service

Author
Tobias Frisch

Definition in file messenger_api_message.c.

Macro Definition Documentation

◆ member_size

#define member_size (   type,
  member 
)    sizeof(((type*) NULL)->member)

Definition at line 181 of file messenger_api_message.c.

◆ max

#define max (   x,
 
)    (x > y? x : y)

Definition at line 335 of file messenger_api_message.c.

◆ min

#define min (   x,
 
)    (x < y? x : y)

Definition at line 363 of file messenger_api_message.c.

◆ encode_step_ext

#define encode_step_ext (   dst,
  offset,
  src,
  size 
)
Value:
do { \
GNUNET_memcpy(dst + offset, src, size); \
offset += size; \
} while (0)
static unsigned int size
Size of the "table".
Definition: peer.c:67

Definition at line 365 of file messenger_api_message.c.

◆ encode_step

#define encode_step (   dst,
  offset,
  src 
)
Value:
do { \
encode_step_ext(dst, offset, src, sizeof(*src)); \
} while (0)

Definition at line 370 of file messenger_api_message.c.

◆ encode_step_key

#define encode_step_key (   dst,
  offset,
  src,
  length 
)
Value:
do { \
src, dst + offset, length - offset \
); \
if (result < 0) \
GNUNET_break (0); \
else \
offset += result; \
} while (0)
static int result
Global testing status.
ssize_t GNUNET_IDENTITY_write_key_to_buffer(const struct GNUNET_IDENTITY_PublicKey *key, void *buffer, size_t len)
Writes a GNUNET_IDENTITY_PublicKey to a compact buffer.

Definition at line 374 of file messenger_api_message.c.

◆ encode_step_signature

#define encode_step_signature (   dst,
  offset,
  src,
  length 
)
Value:
do { \
src, dst + offset, length - offset \
); \
if (result < 0) \
GNUNET_break (0); \
else \
offset += result; \
} while (0)
ssize_t GNUNET_IDENTITY_write_signature_to_buffer(const struct GNUNET_IDENTITY_Signature *sig, void *buffer, size_t len)
Writes a GNUNET_IDENTITY_Signature to a compact buffer.

Definition at line 384 of file messenger_api_message.c.

◆ decode_step_ext

#define decode_step_ext (   src,
  offset,
  dst,
  size 
)
Value:
do { \
GNUNET_memcpy(dst, src + offset, size); \
offset += size; \
} while (0)

Definition at line 526 of file messenger_api_message.c.

◆ decode_step

#define decode_step (   src,
  offset,
  dst 
)
Value:
do { \
decode_step_ext(src, offset, dst, sizeof(*dst)); \
} while (0)

Definition at line 531 of file messenger_api_message.c.

◆ decode_step_malloc

#define decode_step_malloc (   src,
  offset,
  dst,
  size,
  zero 
)
Value:
do { \
dst = GNUNET_malloc(size + zero); \
if (zero) dst[size] = 0; \
decode_step_ext(src, offset, dst, size); \
} while (0)
static const struct GNUNET_IDENTITY_PrivateKey zero
Public key of all zeros.
#define GNUNET_malloc(size)
Wrapper around malloc.

Definition at line 535 of file messenger_api_message.c.

◆ decode_step_key

#define decode_step_key (   src,
  offset,
  dst,
  length 
)
Value:
do { \
dst, src + offset, length - offset \
); \
if (result < 0) \
GNUNET_break(0); \
else \
offset += result; \
} while (0)
ssize_t GNUNET_IDENTITY_read_key_from_buffer(struct GNUNET_IDENTITY_PublicKey *key, const void *buffer, size_t len)
Reads a GNUNET_IDENTITY_PublicKey from a compact buffer.

Definition at line 541 of file messenger_api_message.c.

Typedef Documentation

◆ kind_t

typedef uint32_t kind_t

Definition at line 233 of file messenger_api_message.c.

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]kindKind of message
Returns
New message

Definition at line 41 of file messenger_api_message.c.

42 {
44 
45  message->header.kind = kind;
46 
47  switch (message->header.kind)
48  {
50  message->body.name.name = NULL;
51  break;
53  message->body.text.text = NULL;
54  break;
56  message->body.file.uri = NULL;
57  break;
59  message->body.privacy.length = 0;
60  message->body.privacy.data = NULL;
61  break;
62  default:
63  break;
64  }
65 
66  return message;
67 }
#define GNUNET_new(type)
Allocate a struct or union of the given type.
@ GNUNET_MESSENGER_KIND_PRIVATE
The private kind.
@ GNUNET_MESSENGER_KIND_FILE
The file kind.
@ GNUNET_MESSENGER_KIND_NAME
The name kind.
@ GNUNET_MESSENGER_KIND_TEXT
The text kind.
struct GNUNET_MESSENGER_MessagePrivate privacy
struct GNUNET_MESSENGER_MessageText text
struct GNUNET_MESSENGER_MessageName name
struct GNUNET_MESSENGER_MessageFile file
char * uri
The uri of the encrypted file.
enum GNUNET_MESSENGER_MessageKind kind
The kind of the message.
char * name
The new name which replaces the current senders name.
uint16_t length
The length of the encrypted message.
char * data
The data of the encrypted message.
char * text
The containing text.
struct GNUNET_MESSENGER_MessageHeader header
Header.
struct GNUNET_MESSENGER_MessageBody body
Body.

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_MessagePrivate::data, GNUNET_MESSENGER_MessageBody::file, GNUNET_MESSENGER_KIND_FILE, GNUNET_MESSENGER_KIND_NAME, GNUNET_MESSENGER_KIND_PRIVATE, GNUNET_MESSENGER_KIND_TEXT, GNUNET_new, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_MessagePrivate::length, GNUNET_MESSENGER_MessageName::name, GNUNET_MESSENGER_MessageBody::name, GNUNET_MESSENGER_MessageBody::privacy, GNUNET_MESSENGER_MessageText::text, GNUNET_MESSENGER_MessageBody::text, and GNUNET_MESSENGER_MessageFile::uri.

Referenced by create_message_delete(), create_message_id(), create_message_info(), create_message_invite(), 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_text(), and get_store_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]messageMessage
Returns
New message

Definition at line 70 of file messenger_api_message.c.

71 {
72  GNUNET_assert(message);
73 
75 
76  GNUNET_memcpy(copy, message, sizeof(struct GNUNET_MESSENGER_Message));
77 
78  switch (message->header.kind)
79  {
81  copy->body.name.name = GNUNET_strdup(message->body.name.name);
82  break;
84  copy->body.text.text = GNUNET_strdup(message->body.text.text);
85  break;
87  copy->body.file.uri = GNUNET_strdup(message->body.file.uri);
88  break;
90  copy->body.privacy.data = copy->body.privacy.length ? GNUNET_malloc(copy->body.privacy.length) : NULL;
91 
92  if (copy->body.privacy.data)
93  {
94  GNUNET_memcpy(copy->body.privacy.data, message->body.privacy.data, copy->body.privacy.length);
95  }
96 
97  break;
98  default:
99  break;
100  }
101 
102  return copy;
103 }
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_MessagePrivate::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_TEXT, GNUNET_new, GNUNET_strdup, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_MessagePrivate::length, GNUNET_MESSENGER_MessageName::name, GNUNET_MESSENGER_MessageBody::name, GNUNET_MESSENGER_MessageBody::privacy, GNUNET_MESSENGER_MessageText::text, GNUNET_MESSENGER_MessageBody::text, and GNUNET_MESSENGER_MessageFile::uri.

Referenced by forward_tunnel_message(), handle_room_message(), handle_tunnel_message(), notify_srv_handle_message(), and send_srv_handle_message().

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◆ destroy_message_body()

static void destroy_message_body ( enum GNUNET_MESSENGER_MessageKind  kind,
struct GNUNET_MESSENGER_MessageBody body 
)
static

Definition at line 106 of file messenger_api_message.c.

108 {
109  switch (kind)
110  {
112  GNUNET_free(body->name.name);
113  break;
115  GNUNET_free(body->text.text);
116  break;
118  GNUNET_free(body->file.uri);
119  break;
121  GNUNET_free(body->privacy.data);
122  break;
123  default:
124  break;
125  }
126 }
#define GNUNET_free(ptr)
Wrapper around free.

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_MessagePrivate::data, GNUNET_MESSENGER_MessageBody::file, GNUNET_free, GNUNET_MESSENGER_KIND_FILE, GNUNET_MESSENGER_KIND_NAME, GNUNET_MESSENGER_KIND_PRIVATE, GNUNET_MESSENGER_KIND_TEXT, GNUNET_MESSENGER_MessageName::name, GNUNET_MESSENGER_MessageBody::name, GNUNET_MESSENGER_MessageBody::privacy, GNUNET_MESSENGER_MessageText::text, GNUNET_MESSENGER_MessageBody::text, and GNUNET_MESSENGER_MessageFile::uri.

Referenced by cleanup_message(), destroy_message(), encrypt_message(), and unfold_short_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 129 of file messenger_api_message.c.

130 {
131  GNUNET_assert(message);
132 
133  destroy_message_body (message->header.kind, &(message->body));
134 }
static void destroy_message_body(enum GNUNET_MESSENGER_MessageKind kind, struct GNUNET_MESSENGER_MessageBody *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 137 of file messenger_api_message.c.

138 {
139  GNUNET_assert(message);
140 
141  destroy_message_body (message->header.kind, &(message->body));
142 
143  GNUNET_free(message);
144 }

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

Referenced by callback_set_handle_name(), create_message_peer(), forward_tunnel_message(), get_store_message(), handle_delete_message(), handle_room_message(), iterate_destroy_message(), iterate_destroy_messages(), notify_srv_handle_message(), send_tunnel_message(), set_srv_handle_ego(), and update_room_message().

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◆ is_message_session_bound()

int is_message_session_bound ( const struct GNUNET_MESSENGER_Message message)

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

Parameters
[in]messageMessage
Returns
GNUNET_YES or GNUNET_NO

Definition at line 147 of file messenger_api_message.c.

148 {
149  GNUNET_assert(message);
150 
151  if ((GNUNET_MESSENGER_KIND_JOIN == message->header.kind) ||
152  (GNUNET_MESSENGER_KIND_LEAVE == message->header.kind) ||
153  (GNUNET_MESSENGER_KIND_NAME == message->header.kind) ||
154  (GNUNET_MESSENGER_KIND_KEY == message->header.kind) ||
155  (GNUNET_MESSENGER_KIND_ID == message->header.kind))
156  return GNUNET_YES;
157  else
158  return GNUNET_NO;
159 }
@ GNUNET_YES
@ GNUNET_NO
Definition: gnunet_common.h:98
@ GNUNET_MESSENGER_KIND_LEAVE
The leave kind.
@ GNUNET_MESSENGER_KIND_KEY
The key kind.
@ GNUNET_MESSENGER_KIND_JOIN
The join kind.
@ GNUNET_MESSENGER_KIND_ID
The id kind.

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 send_srv_room_message(), and update_member_session_history().

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◆ fold_short_message()

static void fold_short_message ( const struct GNUNET_MESSENGER_Message message,
struct GNUNET_MESSENGER_ShortMessage shortened 
)
static

Definition at line 162 of file messenger_api_message.c.

164 {
165  shortened->kind = message->header.kind;
166 
167  GNUNET_memcpy(&(shortened->body), &(message->body), sizeof(struct GNUNET_MESSENGER_MessageBody));
168 }
The unified body of a GNUNET_MESSENGER_Message.
struct GNUNET_MESSENGER_MessageBody body
enum GNUNET_MESSENGER_MessageKind kind

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_ShortMessage::body, GNUNET_memcpy, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_MessageHeader::kind, and GNUNET_MESSENGER_ShortMessage::kind.

Referenced by encrypt_message().

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◆ unfold_short_message()

static void unfold_short_message ( struct GNUNET_MESSENGER_ShortMessage shortened,
struct GNUNET_MESSENGER_Message message 
)
static

Definition at line 171 of file messenger_api_message.c.

173 {
174  destroy_message_body (message->header.kind, &(message->body));
175 
176  message->header.kind = shortened->kind;
177 
178  GNUNET_memcpy(&(message->body), &(shortened->body), sizeof(struct GNUNET_MESSENGER_MessageBody));
179 }

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

Referenced by decrypt_message(), and encrypt_message().

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◆ get_message_body_kind_size()

static uint16_t get_message_body_kind_size ( enum GNUNET_MESSENGER_MessageKind  kind)
static

Definition at line 184 of file messenger_api_message.c.

185 {
186  uint16_t length = 0;
187 
188  switch (kind)
189  {
191  length += member_size(struct GNUNET_MESSENGER_Message, body.info.messenger_version);
192  break;
194  length += member_size(struct GNUNET_MESSENGER_Message, body.peer.peer);
195  break;
197  length += member_size(struct GNUNET_MESSENGER_Message, body.id.id);
198  break;
200  length += member_size(struct GNUNET_MESSENGER_Message, body.miss.peer);
201  break;
203  length += member_size(struct GNUNET_MESSENGER_Message, body.merge.previous);
204  break;
206  length += member_size(struct GNUNET_MESSENGER_Message, body.request.hash);
207  break;
209  length += member_size(struct GNUNET_MESSENGER_Message, body.invite.door);
210  length += member_size(struct GNUNET_MESSENGER_Message, body.invite.key);
211  break;
213  break;
215  length += member_size(struct GNUNET_MESSENGER_Message, body.file.key);
216  length += member_size(struct GNUNET_MESSENGER_Message, body.file.hash);
217  length += member_size(struct GNUNET_MESSENGER_Message, body.file.name);
218  break;
220  length += member_size(struct GNUNET_MESSENGER_Message, body.privacy.key);
221  break;
223  length += member_size(struct GNUNET_MESSENGER_Message, body.deletion.hash);
224  length += member_size(struct GNUNET_MESSENGER_Message, body.deletion.delay);
225  break;
226  default:
227  break;
228  }
229 
230  return length;
231 }
@ GNUNET_MESSENGER_KIND_INFO
The info kind.
@ GNUNET_MESSENGER_KIND_MISS
The miss kind.
@ GNUNET_MESSENGER_KIND_INVITE
The invite kind.
@ GNUNET_MESSENGER_KIND_REQUEST
The request kind.
@ GNUNET_MESSENGER_KIND_PEER
The peer kind.
@ GNUNET_MESSENGER_KIND_DELETE
The delete kind.
@ GNUNET_MESSENGER_KIND_MERGE
The merge kind.
#define member_size(type, member)

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_MessageDelete::delay, GNUNET_MESSENGER_MessageBody::deletion, GNUNET_MESSENGER_MessageInvite::door, GNUNET_MESSENGER_MessageBody::file, GNUNET_MESSENGER_KIND_DELETE, GNUNET_MESSENGER_KIND_FILE, GNUNET_MESSENGER_KIND_ID, GNUNET_MESSENGER_KIND_INFO, GNUNET_MESSENGER_KIND_INVITE, GNUNET_MESSENGER_KIND_MERGE, GNUNET_MESSENGER_KIND_MISS, GNUNET_MESSENGER_KIND_PEER, GNUNET_MESSENGER_KIND_PRIVATE, GNUNET_MESSENGER_KIND_REQUEST, GNUNET_MESSENGER_KIND_TEXT, GNUNET_MESSENGER_MessageRequest::hash, GNUNET_MESSENGER_MessageFile::hash, GNUNET_MESSENGER_MessageDelete::hash, GNUNET_MESSENGER_MessageId::id, GNUNET_MESSENGER_MessageBody::id, GNUNET_MESSENGER_MessageBody::info, GNUNET_MESSENGER_MessageBody::invite, GNUNET_MESSENGER_MessageInvite::key, GNUNET_MESSENGER_MessageFile::key, GNUNET_MESSENGER_MessagePrivate::key, member_size, GNUNET_MESSENGER_MessageBody::merge, GNUNET_MESSENGER_MessageInfo::messenger_version, GNUNET_MESSENGER_MessageBody::miss, GNUNET_MESSENGER_MessageFile::name, GNUNET_MESSENGER_MessagePeer::peer, GNUNET_MESSENGER_MessageMiss::peer, GNUNET_MESSENGER_MessageBody::peer, GNUNET_MESSENGER_MessageMerge::previous, GNUNET_MESSENGER_MessageBody::privacy, and GNUNET_MESSENGER_MessageBody::request.

Referenced by get_message_kind_size(), and get_short_message_size().

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◆ get_message_kind_size()

uint16_t get_message_kind_size ( enum GNUNET_MESSENGER_MessageKind  kind,
int  include_header 
)

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

Parameters
[in]kindKind of message
[in]include_headerFlag to include header
Returns
Minimal size to encode

Definition at line 236 of file messenger_api_message.c.

238 {
239  uint16_t length = 0;
240 
241  if (GNUNET_YES == include_header)
242  {
243  length += member_size(struct GNUNET_MESSENGER_Message, header.timestamp);
244  length += member_size(struct GNUNET_MESSENGER_Message, header.sender_id);
245  length += member_size(struct GNUNET_MESSENGER_Message, header.previous);
246  }
247 
248  length += sizeof(kind_t);
249 
250  return length + get_message_body_kind_size (kind);
251 }
static uint16_t get_message_body_kind_size(enum GNUNET_MESSENGER_MessageKind kind)
uint32_t kind_t

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_body_size()

static uint16_t get_message_body_size ( enum GNUNET_MESSENGER_MessageKind  kind,
const struct GNUNET_MESSENGER_MessageBody body 
)
static

Definition at line 254 of file messenger_api_message.c.

256 {
257  uint16_t length = 0;
258 
259  switch (kind)
260  {
262  length += GNUNET_IDENTITY_key_get_length(&(body->info.host_key));
263  break;
265  length += GNUNET_IDENTITY_key_get_length(&(body->join.key));
266  break;
268  length += (body->name.name ? strlen (body->name.name) : 0);
269  break;
271  length += GNUNET_IDENTITY_key_get_length(&(body->key.key));
272  break;
274  length += strlen (body->text.text);
275  break;
277  length += strlen (body->file.uri);
278  break;
280  length += body->privacy.length;
281  break;
282  default:
283  break;
284  }
285 
286  return length;
287 }
ssize_t GNUNET_IDENTITY_key_get_length(const struct GNUNET_IDENTITY_PublicKey *key)
Get the compacted length of a GNUNET_IDENTITY_PublicKey.
Definition: identity_api.c:991
struct GNUNET_MESSENGER_MessageKey key
struct GNUNET_MESSENGER_MessageJoin join
struct GNUNET_MESSENGER_MessageInfo info
struct GNUNET_IDENTITY_PublicKey host_key
The senders key to verify its signatures.
struct GNUNET_IDENTITY_PublicKey key
The senders public key to verify its signatures.
struct GNUNET_IDENTITY_PublicKey key
The new public key which replaces the current senders public key.

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_MessageBody::file, GNUNET_IDENTITY_key_get_length(), GNUNET_MESSENGER_KIND_FILE, GNUNET_MESSENGER_KIND_INFO, GNUNET_MESSENGER_KIND_JOIN, GNUNET_MESSENGER_KIND_KEY, GNUNET_MESSENGER_KIND_NAME, GNUNET_MESSENGER_KIND_PRIVATE, GNUNET_MESSENGER_KIND_TEXT, GNUNET_MESSENGER_MessageInfo::host_key, GNUNET_MESSENGER_MessageBody::info, GNUNET_MESSENGER_MessageBody::join, GNUNET_MESSENGER_MessageJoin::key, GNUNET_MESSENGER_MessageKey::key, GNUNET_MESSENGER_MessageBody::key, GNUNET_MESSENGER_MessagePrivate::length, GNUNET_MESSENGER_MessageName::name, GNUNET_MESSENGER_MessageBody::name, GNUNET_MESSENGER_MessageBody::privacy, GNUNET_MESSENGER_MessageText::text, GNUNET_MESSENGER_MessageBody::text, and GNUNET_MESSENGER_MessageFile::uri.

Referenced by get_message_size(), and get_short_message_size().

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◆ get_message_size()

uint16_t get_message_size ( const struct GNUNET_MESSENGER_Message message,
int  include_header 
)

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

Parameters
[in]messageMessage
[in]include_headerFlag to include header
Returns
Size to encode

Definition at line 290 of file messenger_api_message.c.

292 {
293  GNUNET_assert(message);
294 
295  uint16_t length = 0;
296 
297  if (GNUNET_YES == include_header)
299 
300  length += get_message_kind_size (message->header.kind, include_header);
301  length += get_message_body_size (message->header.kind, &(message->body));
302 
303  return length;
304 }
ssize_t GNUNET_IDENTITY_signature_get_length(const struct GNUNET_IDENTITY_Signature *sig)
Get the compacted length of a GNUNET_IDENTITY_Signature.
static uint16_t get_message_body_size(enum GNUNET_MESSENGER_MessageKind kind, const struct GNUNET_MESSENGER_MessageBody *body)
uint16_t get_message_kind_size(enum GNUNET_MESSENGER_MessageKind kind, int include_header)
Returns the minimal size in bytes to encode a message of a specific kind.
struct GNUNET_IDENTITY_Signature signature
The signature of the senders private key.

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

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

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◆ get_short_message_size()

static uint16_t get_short_message_size ( const struct GNUNET_MESSENGER_ShortMessage message,
int  include_body 
)
static

Definition at line 307 of file messenger_api_message.c.

309 {
310  const uint16_t minimum_size = sizeof(struct GNUNET_HashCode) + sizeof(kind_t);
311 
312  if (message)
313  return minimum_size + get_message_body_kind_size (message->kind)
314  + (include_body == GNUNET_YES? get_message_body_size (message->kind, &(message->body)) : 0);
315  else
316  return minimum_size;
317 }
A 512-bit hashcode.

References GNUNET_MESSENGER_ShortMessage::body, get_message_body_kind_size(), get_message_body_size(), GNUNET_YES, and GNUNET_MESSENGER_ShortMessage::kind.

Referenced by decode_short_message(), and encrypt_message().

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◆ calc_usual_padding()

static uint16_t calc_usual_padding ( )
static

Definition at line 320 of file messenger_api_message.c.

321 {
322  uint16_t padding = 0;
323  uint16_t kind_size;
324 
325  for (int i = 0; i <= GNUNET_MESSENGER_KIND_MAX; i++) {
327 
328  if (kind_size > padding)
329  padding = kind_size;
330  }
331 
332  return padding + GNUNET_MESSENGER_PADDING_MIN;
333 }
GNUNET_MESSENGER_MessageKind
Enum for the different supported kinds of messages.
#define GNUNET_MESSENGER_KIND_MAX
#define GNUNET_MESSENGER_PADDING_MIN

References get_message_kind_size(), GNUNET_MESSENGER_KIND_MAX, GNUNET_MESSENGER_PADDING_MIN, and GNUNET_YES.

Referenced by calc_padded_length().

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◆ calc_padded_length()

static uint16_t calc_padded_length ( uint16_t  length)
static

Definition at line 338 of file messenger_api_message.c.

339 {
340  static uint16_t usual_padding = 0;
341 
342  if (!usual_padding)
343  usual_padding = calc_usual_padding();
344 
345  const uint16_t padded_length = max(
347  usual_padding
348  );
349 
350  if (padded_length <= GNUNET_MESSENGER_PADDING_LEVEL0)
352 
353  if (padded_length <= GNUNET_MESSENGER_PADDING_LEVEL1)
355 
356  if (padded_length <= GNUNET_MESSENGER_PADDING_LEVEL2)
358 
360 
361 }
static uint16_t calc_usual_padding()
#define max(x, y)
#define GNUNET_MESSENGER_MAX_MESSAGE_SIZE
#define GNUNET_MESSENGER_PADDING_LEVEL0
#define GNUNET_MESSENGER_PADDING_LEVEL2
#define GNUNET_MESSENGER_PADDING_LEVEL1

References calc_usual_padding(), GNUNET_MESSENGER_MAX_MESSAGE_SIZE, GNUNET_MESSENGER_PADDING_LEVEL0, GNUNET_MESSENGER_PADDING_LEVEL1, GNUNET_MESSENGER_PADDING_LEVEL2, GNUNET_MESSENGER_PADDING_MIN, and max.

Referenced by encrypt_message(), and pack_message().

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◆ encode_message_body()

static void encode_message_body ( enum GNUNET_MESSENGER_MessageKind  kind,
const struct GNUNET_MESSENGER_MessageBody body,
uint16_t  length,
char *  buffer,
uint16_t  offset 
)
static

Definition at line 395 of file messenger_api_message.c.

400 {
401  uint32_t version;
402  switch (kind)
403  {
405  version = GNUNET_htobe32(body->info.messenger_version);
406 
407  encode_step_key(buffer, offset, &(body->info.host_key), length);
408  encode_step(buffer, offset, &version);
409  break;
411  encode_step_key(buffer, offset, &(body->join.key), length);
412  break;
414  if (body->name.name)
415  encode_step_ext(buffer, offset, body->name.name, min(length - offset, strlen(body->name.name)));
416  break;
418  encode_step_key(buffer, offset, &(body->key.key), length);
419  break;
421  encode_step(buffer, offset, &(body->peer.peer));
422  break;
424  encode_step(buffer, offset, &(body->id.id));
425  break;
427  encode_step(buffer, offset, &(body->miss.peer));
428  break;
430  encode_step(buffer, offset, &(body->merge.previous));
431  break;
433  encode_step(buffer, offset, &(body->request.hash));
434  break;
436  encode_step(buffer, offset, &(body->invite.door));
437  encode_step(buffer, offset, &(body->invite.key));
438  break;
440  encode_step_ext(buffer, offset, body->text.text, min(length - offset, strlen(body->text.text)));
441  break;
443  encode_step(buffer, offset, &(body->file.key));
444  encode_step(buffer, offset, &(body->file.hash));
445  encode_step_ext(buffer, offset, body->file.name, sizeof(body->file.name));
446  encode_step_ext(buffer, offset, body->file.uri, min(length - offset, strlen(body->file.uri)));
447  break;
449  encode_step(buffer, offset, &(body->privacy.key));
450  encode_step_ext(buffer, offset, body->privacy.data, min(length - offset, body->privacy.length));
451  break;
453  encode_step(buffer, offset, &(body->deletion.hash));
454  encode_step(buffer, offset, &(body->deletion.delay));
455  break;
456  default:
457  break;
458  }
459 
460  if (offset >= length)
461  return;
462 
463  const uint16_t padding = length - offset;
464  const uint16_t used_padding = sizeof(padding) + sizeof(char);
465 
466  GNUNET_assert(padding >= used_padding);
467 
468  buffer[offset++] = '\0';
469 
470  if (padding > used_padding)
471  GNUNET_CRYPTO_random_block(GNUNET_CRYPTO_QUALITY_WEAK, buffer + offset, padding - used_padding);
472 
473  GNUNET_memcpy(buffer + length - sizeof(padding), &padding, sizeof(padding));
474 }
void GNUNET_CRYPTO_random_block(enum GNUNET_CRYPTO_Quality mode, void *buffer, size_t length)
Fill block with a random values.
@ GNUNET_CRYPTO_QUALITY_WEAK
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).
#define GNUNET_htobe32(x)
#define encode_step_ext(dst, offset, src, size)
#define encode_step(dst, offset, src)
#define min(x, y)
#define encode_step_key(dst, offset, src, length)
struct GNUNET_MESSENGER_MessageRequest request
struct GNUNET_MESSENGER_MessageMerge merge
struct GNUNET_MESSENGER_MessageId id
struct GNUNET_MESSENGER_MessageInvite invite
struct GNUNET_MESSENGER_MessageMiss miss
struct GNUNET_MESSENGER_MessagePeer peer
struct GNUNET_MESSENGER_MessageDelete deletion
struct GNUNET_HashCode hash
The hash of the message to delete.
struct GNUNET_TIME_RelativeNBO delay
The delay of the delete operation to get processed.
struct GNUNET_HashCode hash
The hash of the original file.
struct GNUNET_CRYPTO_SymmetricSessionKey key
The symmetric key to decrypt the file.
char name[NAME_MAX]
The name of the original file.
struct GNUNET_ShortHashCode id
The new id which will replace the senders id in a room.
uint32_t messenger_version
The version of GNUnet Messenger API.
struct GNUNET_HashCode key
The hash identifying the port of the room.
struct GNUNET_PeerIdentity door
The peer identity of an open door to a room.
struct GNUNET_HashCode previous
The hash of a second previous message.
struct GNUNET_PeerIdentity peer
The peer identity of a disconnected door to a room.
struct GNUNET_PeerIdentity peer
The peer identity of the sender opening a room.
struct GNUNET_CRYPTO_EcdhePublicKey key
The ECDH key to decrypt the message.
struct GNUNET_HashCode hash
The hash of the requested message.

References GNUNET_MESSENGER_MessagePrivate::data, GNUNET_MESSENGER_MessageDelete::delay, GNUNET_MESSENGER_MessageBody::deletion, GNUNET_MESSENGER_MessageInvite::door, encode_step, encode_step_ext, encode_step_key, GNUNET_MESSENGER_MessageBody::file, GNUNET_assert, GNUNET_CRYPTO_QUALITY_WEAK, GNUNET_CRYPTO_random_block(), GNUNET_htobe32, GNUNET_memcpy, GNUNET_MESSENGER_KIND_DELETE, GNUNET_MESSENGER_KIND_FILE, GNUNET_MESSENGER_KIND_ID, GNUNET_MESSENGER_KIND_INFO, GNUNET_MESSENGER_KIND_INVITE, GNUNET_MESSENGER_KIND_JOIN, GNUNET_MESSENGER_KIND_KEY, 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_TEXT, GNUNET_MESSENGER_MessageRequest::hash, GNUNET_MESSENGER_MessageFile::hash, GNUNET_MESSENGER_MessageDelete::hash, GNUNET_MESSENGER_MessageInfo::host_key, GNUNET_MESSENGER_MessageId::id, GNUNET_MESSENGER_MessageBody::id, GNUNET_MESSENGER_MessageBody::info, GNUNET_MESSENGER_MessageBody::invite, GNUNET_MESSENGER_MessageBody::join, GNUNET_MESSENGER_MessageJoin::key, GNUNET_MESSENGER_MessageKey::key, GNUNET_MESSENGER_MessageInvite::key, GNUNET_MESSENGER_MessageFile::key, GNUNET_MESSENGER_MessagePrivate::key, GNUNET_MESSENGER_MessageBody::key, GNUNET_MESSENGER_MessagePrivate::length, GNUNET_MESSENGER_MessageBody::merge, GNUNET_MESSENGER_MessageInfo::messenger_version, min, GNUNET_MESSENGER_MessageBody::miss, GNUNET_MESSENGER_MessageName::name, GNUNET_MESSENGER_MessageFile::name, GNUNET_MESSENGER_MessageBody::name, GNUNET_MESSENGER_MessagePeer::peer, GNUNET_MESSENGER_MessageMiss::peer, GNUNET_MESSENGER_MessageBody::peer, GNUNET_MESSENGER_MessageMerge::previous, GNUNET_MESSENGER_MessageBody::privacy, GNUNET_MESSENGER_MessageBody::request, GNUNET_MESSENGER_MessageText::text, GNUNET_MESSENGER_MessageBody::text, and GNUNET_MESSENGER_MessageFile::uri.

Referenced by encode_message(), and encode_short_message().

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◆ encode_message()

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

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

Parameters
[in]messageMessage
[in]lengthMaximal length to encode
[out]bufferBuffer
[in]include_headerFlag to include header

Definition at line 477 of file messenger_api_message.c.

481 {
482  GNUNET_assert((message) && (buffer));
483 
484  uint16_t offset = 0;
485 
486  if (GNUNET_YES == include_header)
487  encode_step_signature(buffer, offset, &(message->header.signature), length);
488 
489  const kind_t kind = GNUNET_htobe32((kind_t) message->header.kind);
490 
491  if (GNUNET_YES == include_header)
492  {
493  encode_step(buffer, offset, &(message->header.timestamp));
494  encode_step(buffer, offset, &(message->header.sender_id));
495  encode_step(buffer, offset, &(message->header.previous));
496  }
497 
498  encode_step(buffer, offset, &kind);
499 
500  encode_message_body (message->header.kind, &(message->body), length, buffer, offset);
501 }
static void encode_message_body(enum GNUNET_MESSENGER_MessageKind kind, const struct GNUNET_MESSENGER_MessageBody *body, uint16_t length, char *buffer, uint16_t offset)
#define encode_step_signature(dst, offset, src, length)
struct GNUNET_HashCode previous
The hash of the previous message from the senders perspective.
struct GNUNET_TIME_AbsoluteNBO timestamp
The timestamp of the message.
struct GNUNET_ShortHashCode sender_id
The senders id inside of the room the message was sent in.

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 GNUNET_MESSENGER_send_message(), iterate_save_messages(), notify_srv_handle_message(), and pack_message().

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◆ encode_short_message()

static void encode_short_message ( const struct GNUNET_MESSENGER_ShortMessage message,
uint16_t  length,
char *  buffer 
)
static

Definition at line 504 of file messenger_api_message.c.

507 {
508  struct GNUNET_HashCode hash;
509  uint16_t offset = sizeof(hash);
510 
511  const kind_t kind = GNUNET_htobe32((kind_t) message->kind);
512 
513  encode_step(buffer, offset, &kind);
514 
515  encode_message_body (message->kind, &(message->body), length, buffer, offset);
516 
518  buffer + sizeof(hash),
519  length - sizeof(hash),
520  &hash
521  );
522 
523  GNUNET_memcpy(buffer, &hash, sizeof(hash));
524 }
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:41

References GNUNET_MESSENGER_ShortMessage::body, encode_message_body(), encode_step, GNUNET_CRYPTO_hash(), GNUNET_htobe32, GNUNET_memcpy, and GNUNET_MESSENGER_ShortMessage::kind.

Referenced by encrypt_message().

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◆ decode_message_body()

static uint16_t decode_message_body ( enum GNUNET_MESSENGER_MessageKind kind,
struct GNUNET_MESSENGER_MessageBody body,
uint16_t  length,
const char *  buffer,
uint16_t  offset 
)
static

Definition at line 552 of file messenger_api_message.c.

557 {
558  uint16_t padding = 0;
559 
560  GNUNET_memcpy(&padding, buffer + length - sizeof(padding), sizeof(padding));
561 
562  if (padding > length - offset)
563  padding = 0;
564 
565  const uint16_t end_zero = length - padding;
566 
567  if ((padding) && (buffer[end_zero] != '\0'))
568  padding = 0;
569 
570  length -= padding;
571 
572  uint32_t version;
573  switch (*kind)
574  {
576  decode_step_key(buffer, offset, &(body->info.host_key), length);
577  decode_step(buffer, offset, &version);
578 
579  body->info.messenger_version = GNUNET_be32toh(version);
580  break;
582  decode_step_key(buffer, offset, &(body->join.key), length);
583  break;
585  if (length - offset > 0)
586  decode_step_malloc(buffer, offset, body->name.name, length - offset, 1);
587  else
588  body->name.name = NULL;
589  break;
591  decode_step_key(buffer, offset, &(body->key.key), length);
592  break;
594  decode_step(buffer, offset, &(body->peer.peer));
595  break;
597  decode_step(buffer, offset, &(body->id.id));
598  break;
600  decode_step(buffer, offset, &(body->miss.peer));
601  break;
603  decode_step(buffer, offset, &(body->merge.previous));
604  break;
606  decode_step(buffer, offset, &(body->request.hash));
607  break;
609  decode_step(buffer, offset, &(body->invite.door));
610  decode_step(buffer, offset, &(body->invite.key));
611  break;
613  decode_step_malloc(buffer, offset, body->text.text, length - offset, 1);
614  break;
616  decode_step(buffer, offset, &(body->file.key));
617  decode_step(buffer, offset, &(body->file.hash));
618  decode_step_ext(buffer, offset, body->file.name, sizeof(body->file.name));
619  decode_step_malloc(buffer, offset, body->file.uri, length - offset, 1);
620  break;
622  decode_step(buffer, offset, &(body->privacy.key));
623 
624  body->privacy.length = (length - offset);
625  decode_step_malloc(buffer, offset, body->privacy.data, length - offset, 0);
626  break;
628  decode_step(buffer, offset, &(body->deletion.hash));
629  decode_step(buffer, offset, &(body->deletion.delay));
630  break;
631  default:
633  break;
634  }
635 
636  return padding;
637 }
#define GNUNET_be32toh(x)
@ GNUNET_MESSENGER_KIND_UNKNOWN
The unknown kind.
#define decode_step(src, offset, dst)
#define decode_step_key(src, offset, dst, length)
#define decode_step_malloc(src, offset, dst, size, zero)
#define decode_step_ext(src, offset, dst, size)

References GNUNET_MESSENGER_MessagePrivate::data, decode_step, decode_step_ext, decode_step_key, decode_step_malloc, GNUNET_MESSENGER_MessageDelete::delay, GNUNET_MESSENGER_MessageBody::deletion, GNUNET_MESSENGER_MessageInvite::door, GNUNET_MESSENGER_MessageBody::file, GNUNET_be32toh, GNUNET_memcpy, GNUNET_MESSENGER_KIND_DELETE, GNUNET_MESSENGER_KIND_FILE, GNUNET_MESSENGER_KIND_ID, GNUNET_MESSENGER_KIND_INFO, GNUNET_MESSENGER_KIND_INVITE, GNUNET_MESSENGER_KIND_JOIN, GNUNET_MESSENGER_KIND_KEY, 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_TEXT, GNUNET_MESSENGER_KIND_UNKNOWN, GNUNET_MESSENGER_MessageRequest::hash, GNUNET_MESSENGER_MessageFile::hash, GNUNET_MESSENGER_MessageDelete::hash, GNUNET_MESSENGER_MessageInfo::host_key, GNUNET_MESSENGER_MessageId::id, GNUNET_MESSENGER_MessageBody::id, GNUNET_MESSENGER_MessageBody::info, GNUNET_MESSENGER_MessageBody::invite, GNUNET_MESSENGER_MessageBody::join, GNUNET_MESSENGER_MessageJoin::key, GNUNET_MESSENGER_MessageInvite::key, GNUNET_MESSENGER_MessageKey::key, GNUNET_MESSENGER_MessageFile::key, GNUNET_MESSENGER_MessagePrivate::key, GNUNET_MESSENGER_MessageBody::key, GNUNET_MESSENGER_MessagePrivate::length, GNUNET_MESSENGER_MessageBody::merge, GNUNET_MESSENGER_MessageInfo::messenger_version, GNUNET_MESSENGER_MessageBody::miss, GNUNET_MESSENGER_MessageName::name, GNUNET_MESSENGER_MessageFile::name, GNUNET_MESSENGER_MessageBody::name, GNUNET_MESSENGER_MessageMiss::peer, GNUNET_MESSENGER_MessagePeer::peer, GNUNET_MESSENGER_MessageBody::peer, GNUNET_MESSENGER_MessageMerge::previous, GNUNET_MESSENGER_MessageBody::privacy, GNUNET_MESSENGER_MessageBody::request, GNUNET_MESSENGER_MessageText::text, GNUNET_MESSENGER_MessageBody::text, and GNUNET_MESSENGER_MessageFile::uri.

Referenced by decode_message(), and decode_short_message().

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◆ decode_message()

int decode_message ( struct GNUNET_MESSENGER_Message message,
uint16_t  length,
const char *  buffer,
int  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]messageMessage
[in]lengthMaximal length to decode
[in]bufferBuffer
[in]include_headerFlag to include header
[out]paddingPadding
Returns
GNUNET_YES on success, otherwise GNUNET_NO

Definition at line 640 of file messenger_api_message.c.

645 {
647  (message) &&
648  (buffer) &&
649  (length >= get_message_kind_size(GNUNET_MESSENGER_KIND_UNKNOWN, include_header))
650  );
651 
652  uint16_t offset = 0;
653 
654  if (GNUNET_YES == include_header)
655  {
657  &(message->header.signature), buffer, length - offset
658  );
659 
660  if (result < 0)
661  return GNUNET_NO;
662  else
663  offset += result;
664  }
665 
666  const uint16_t count = length - offset;
667 
668  if (count < get_message_kind_size (GNUNET_MESSENGER_KIND_UNKNOWN, include_header))
669  return GNUNET_NO;
670 
671  kind_t kind;
672 
673  if (GNUNET_YES == include_header)
674  {
675  decode_step(buffer, offset, &(message->header.timestamp));
676  decode_step(buffer, offset, &(message->header.sender_id));
677  decode_step(buffer, offset, &(message->header.previous));
678  }
679 
680  decode_step(buffer, offset, &kind);
681 
682  message->header.kind = (enum GNUNET_MESSENGER_MessageKind) GNUNET_be32toh(kind);
683 
684  if (count < get_message_kind_size (message->header.kind, include_header))
685  return GNUNET_NO;
686 
687  const uint16_t result = decode_message_body (&(message->header.kind), &(message->body), length, buffer, offset);
688 
689  if (padding)
690  *padding = result;
691 
692  return GNUNET_YES;
693 }
ssize_t GNUNET_IDENTITY_read_signature_from_buffer(struct GNUNET_IDENTITY_Signature *sig, const void *buffer, size_t len)
Reads a GNUNET_IDENTITY_Signature from a compact buffer.
static uint16_t decode_message_body(enum GNUNET_MESSENGER_MessageKind *kind, struct GNUNET_MESSENGER_MessageBody *body, uint16_t length, const char *buffer, uint16_t offset)

References GNUNET_MESSENGER_Message::body, decode_message_body(), decode_step, get_message_kind_size(), GNUNET_assert, GNUNET_be32toh, GNUNET_IDENTITY_read_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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◆ decode_short_message()

static int decode_short_message ( struct GNUNET_MESSENGER_ShortMessage message,
uint16_t  length,
const char *  buffer 
)
static

Definition at line 696 of file messenger_api_message.c.

699 {
700  struct GNUNET_HashCode expected, hash;
701  uint16_t offset = sizeof(hash);
702 
703  if (length < get_short_message_size (NULL, GNUNET_NO))
704  return GNUNET_NO;
705 
706  GNUNET_memcpy(&hash, buffer, sizeof(hash));
707 
709  buffer + sizeof(hash),
710  length - sizeof(hash),
711  &expected
712  );
713 
714  if (0 != GNUNET_CRYPTO_hash_cmp(&hash, &expected))
715  return GNUNET_NO;
716 
717  kind_t kind;
718 
719  decode_step(buffer, offset, &kind);
720 
721  message->kind = (enum GNUNET_MESSENGER_MessageKind) GNUNET_be32toh(kind);
722 
723  if (length < get_short_message_size (message, GNUNET_NO))
724  return GNUNET_NO;
725 
726  decode_message_body (&(message->kind), &(message->body), length, buffer, offset);
727 
728  if (GNUNET_MESSENGER_KIND_UNKNOWN == message->kind)
729  return GNUNET_NO;
730 
731  return GNUNET_YES;
732 }
int GNUNET_CRYPTO_hash_cmp(const struct GNUNET_HashCode *h1, const struct GNUNET_HashCode *h2)
Compare function for HashCodes, producing a total ordering of all hashcodes.
Definition: crypto_hash.c:220
static uint16_t get_short_message_size(const struct GNUNET_MESSENGER_ShortMessage *message, int include_body)

References GNUNET_MESSENGER_ShortMessage::body, decode_message_body(), decode_step, get_short_message_size(), GNUNET_be32toh, GNUNET_CRYPTO_hash(), GNUNET_CRYPTO_hash_cmp(), GNUNET_memcpy, GNUNET_MESSENGER_KIND_UNKNOWN, GNUNET_NO, GNUNET_YES, and GNUNET_MESSENGER_ShortMessage::kind.

Referenced by decrypt_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]messageMessage
[in]lengthLength of buffer
[in]bufferBuffer
[out]hashHash

Definition at line 735 of file messenger_api_message.c.

739 {
740  GNUNET_assert((message) && (buffer) && (hash));
741 
742  const ssize_t offset = GNUNET_IDENTITY_signature_get_length(
743  &(message->header.signature)
744  );
745 
746  GNUNET_CRYPTO_hash (buffer + offset, length - offset, hash);
747 }

References GNUNET_assert, GNUNET_CRYPTO_hash(), GNUNET_IDENTITY_signature_get_length(), GNUNET_MESSENGER_Message::header, and GNUNET_MESSENGER_MessageHeader::signature.

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

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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_MESSENGER_Ego ego 
)

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

Parameters
[in/out]message Message
[in]lengthLength of buffer
[out]bufferBuffer
[in]hashHash of message
[in]egoEGO

Definition at line 750 of file messenger_api_message.c.

755 {
756  GNUNET_assert((message) && (buffer) && (hash) && (ego));
757 
758  struct GNUNET_MESSENGER_MessageSignature signature;
759 
761  signature.purpose.size = htonl (sizeof(signature));
762 
763  GNUNET_memcpy(&(signature.hash), hash, sizeof(struct GNUNET_HashCode));
764  GNUNET_IDENTITY_sign(&(ego->priv), &signature, &(message->header.signature));
765 
766  uint16_t offset = 0;
767  encode_step_signature(buffer, offset, &(message->header.signature), length);
768 }
#define GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE
Signature of a chat message.
#define GNUNET_IDENTITY_sign(priv, ps, sig)
Sign a given block with GNUNET_IDENTITY_PrivateKey.
uint32_t purpose
What does this signature vouch for? This must contain a GNUNET_SIGNATURE_PURPOSE_XXX constant (from g...
struct GNUNET_IDENTITY_PrivateKey priv
struct GNUNET_CRYPTO_EccSignaturePurpose purpose

References encode_step_signature, GNUNET_assert, GNUNET_IDENTITY_sign, GNUNET_memcpy, GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE, GNUNET_MESSENGER_MessageSignature::hash, GNUNET_MESSENGER_Message::header, GNUNET_MESSENGER_Ego::priv, GNUNET_CRYPTO_EccSignaturePurpose::purpose, GNUNET_MESSENGER_MessageSignature::purpose, GNUNET_MESSENGER_MessageHeader::signature, and GNUNET_CRYPTO_EccSignaturePurpose::size.

Referenced by pack_message().

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◆ verify_message()

int verify_message ( const struct GNUNET_MESSENGER_Message message,
const struct GNUNET_HashCode hash,
const struct GNUNET_IDENTITY_PublicKey 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]messageMessage
[in]hashHash of message
[in]keyPublic key of EGO
Returns
GNUNET_OK on success, otherwise GNUNET_SYSERR

Definition at line 771 of file messenger_api_message.c.

774 {
775  GNUNET_assert((message) && (hash) && (key));
776 
777  if (ntohl (key->type) != ntohl (message->header.signature.type))
778  return GNUNET_SYSERR;
779 
780  struct GNUNET_MESSENGER_MessageSignature signature;
781 
783  signature.purpose.size = htonl (sizeof(signature));
784 
785  GNUNET_memcpy(&(signature.hash), hash, sizeof(struct GNUNET_HashCode));
786 
788  &(message->header.signature), key);
789 }
struct GNUNET_HashCode key
The key used in the DHT.
#define GNUNET_IDENTITY_signature_verify(purp, ps, sig, pub)
Verify a given signature with GNUNET_IDENTITY_PublicKey.
@ GNUNET_SYSERR
Definition: gnunet_common.h:97
uint32_t type
Type of signature.

References GNUNET_assert, GNUNET_IDENTITY_signature_verify, GNUNET_memcpy, GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE, GNUNET_SYSERR, GNUNET_MESSENGER_MessageSignature::hash, GNUNET_MESSENGER_Message::header, key, GNUNET_CRYPTO_EccSignaturePurpose::purpose, GNUNET_MESSENGER_MessageSignature::purpose, GNUNET_MESSENGER_MessageHeader::signature, GNUNET_CRYPTO_EccSignaturePurpose::size, and GNUNET_IDENTITY_Signature::type.

Referenced by verify_member_session_as_sender().

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◆ encrypt_message()

int encrypt_message ( struct GNUNET_MESSENGER_Message message,
const struct GNUNET_IDENTITY_PublicKey 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]keyPublic key of EGO
Returns
GNUNET_YES on success, otherwise GNUNET_NO

Definition at line 792 of file messenger_api_message.c.

794 {
795  GNUNET_assert((message) && (key));
796 
797  struct GNUNET_MESSENGER_ShortMessage shortened;
798 
799  fold_short_message (message, &shortened);
800 
801  const uint16_t length = get_short_message_size (&shortened, GNUNET_YES);
802  const uint16_t padded_length = calc_padded_length(length);
803 
805  message->body.privacy.data = GNUNET_malloc(padded_length);
806  message->body.privacy.length = padded_length;
807 
808  encode_short_message (&shortened, padded_length, message->body.privacy.data);
809 
810  if (padded_length == GNUNET_IDENTITY_encrypt (message->body.privacy.data, padded_length, key,
811  &(message->body.privacy.key),
812  message->body.privacy.data))
813  {
814  destroy_message_body (shortened.kind, &(shortened.body));
815  return GNUNET_YES;
816  }
817  else
818  {
819  GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Encrypting message failed!\n");
820 
821  unfold_short_message (&shortened, message);
822  return GNUNET_NO;
823  }
824 }
ssize_t GNUNET_IDENTITY_encrypt(const void *block, size_t size, const struct GNUNET_IDENTITY_PublicKey *pub, struct GNUNET_CRYPTO_EcdhePublicKey *ecc, void *result)
Encrypt a block with GNUNET_IDENTITY_PublicKey and derives a GNUNET_CRYPTO_EcdhePublicKey which is re...
#define GNUNET_log(kind,...)
@ GNUNET_ERROR_TYPE_WARNING
static void fold_short_message(const struct GNUNET_MESSENGER_Message *message, struct GNUNET_MESSENGER_ShortMessage *shortened)
static uint16_t calc_padded_length(uint16_t length)
static void encode_short_message(const struct GNUNET_MESSENGER_ShortMessage *message, uint16_t length, char *buffer)
static void unfold_short_message(struct GNUNET_MESSENGER_ShortMessage *shortened, struct GNUNET_MESSENGER_Message *message)

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_ShortMessage::body, calc_padded_length(), GNUNET_MESSENGER_MessagePrivate::data, destroy_message_body(), encode_short_message(), fold_short_message(), get_short_message_size(), GNUNET_assert, GNUNET_ERROR_TYPE_WARNING, GNUNET_IDENTITY_encrypt(), GNUNET_log, GNUNET_malloc, GNUNET_MESSENGER_KIND_PRIVATE, GNUNET_NO, GNUNET_YES, GNUNET_MESSENGER_Message::header, key, GNUNET_MESSENGER_MessagePrivate::key, GNUNET_MESSENGER_MessageHeader::kind, GNUNET_MESSENGER_ShortMessage::kind, GNUNET_MESSENGER_MessagePrivate::length, GNUNET_MESSENGER_MessageBody::privacy, and unfold_short_message().

Referenced by handle_send_message().

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◆ decrypt_message()

int decrypt_message ( struct GNUNET_MESSENGER_Message message,
const struct GNUNET_IDENTITY_PrivateKey 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]keyPrivate key of EGO
Returns
GNUNET_YES on success, otherwise GNUNET_NO

Definition at line 827 of file messenger_api_message.c.

829 {
830  GNUNET_assert((message) && (key));
831 
832  if (message->body.privacy.length != GNUNET_IDENTITY_decrypt (message->body.privacy.data, message->body.privacy.length,
833  key, &(message->body.privacy.key),
834  message->body.privacy.data))
835  {
836  GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Decrypting message failed!\n");
837 
838  return GNUNET_NO;
839  }
840 
841  struct GNUNET_MESSENGER_ShortMessage shortened;
842 
843  if (GNUNET_YES != decode_short_message (&shortened, message->body.privacy.length, message->body.privacy.data))
844  {
845  GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Decoding decrypted message failed!\n");
846 
847  return GNUNET_NO;
848  }
849 
850  unfold_short_message (&shortened, message);
851 
852  return GNUNET_YES;
853 }
ssize_t GNUNET_IDENTITY_decrypt(const void *block, size_t size, const struct GNUNET_IDENTITY_PrivateKey *priv, const struct GNUNET_CRYPTO_EcdhePublicKey *ecc, void *result)
Decrypt a given block with GNUNET_IDENTITY_PrivateKey and a given GNUNET_CRYPTO_EcdhePublicKey using ...
static int decode_short_message(struct GNUNET_MESSENGER_ShortMessage *message, uint16_t length, const char *buffer)

References GNUNET_MESSENGER_Message::body, GNUNET_MESSENGER_MessagePrivate::data, decode_short_message(), GNUNET_assert, GNUNET_ERROR_TYPE_WARNING, GNUNET_IDENTITY_decrypt(), GNUNET_log, GNUNET_NO, GNUNET_YES, key, GNUNET_MESSENGER_MessagePrivate::key, GNUNET_MESSENGER_MessagePrivate::length, GNUNET_MESSENGER_MessageBody::privacy, and unfold_short_message().

Referenced by notify_srv_handle_message().

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◆ pack_message()

struct GNUNET_MQ_Envelope* pack_message ( struct GNUNET_MESSENGER_Message message,
struct GNUNET_HashCode hash,
const struct GNUNET_MESSENGER_Ego ego,
int  mode 
)

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 ego is not NULL.

Parameters
[out]messageMessage
[out]hashHash of message
[in]egoEGO to sign
[in]modeMode of packing
Returns
Envelope or NULL

Definition at line 856 of file messenger_api_message.c.

860 {
861  GNUNET_assert(message);
862 
863  if (ego)
864  message->header.signature.type = ego->priv.type;
865 
866  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Packing message kind=%u and sender: %s\n",
867  message->header.kind, GNUNET_sh2s(&(message->header.sender_id)));
868 
869  struct GNUNET_MessageHeader *header;
870 
871  const uint16_t length = get_message_size (message, GNUNET_YES);
872  const uint16_t padded_length = calc_padded_length(length);
873 
874  struct GNUNET_MQ_Envelope *env;
875  char *buffer;
876 
878  {
879  env = GNUNET_MQ_msg_extra(header, padded_length, GNUNET_MESSAGE_TYPE_CADET_CLI);
880 
881  buffer = (char*) &(header[1]);
882  }
883  else
884  {
885  env = NULL;
886 
887  buffer = GNUNET_malloc(padded_length);
888  }
889 
890  encode_message (message, padded_length, buffer, GNUNET_YES);
891 
892  if (hash)
893  {
894  hash_message (message, length, buffer, hash);
895 
896  if (ego)
897  sign_message (message, length, buffer, hash, ego);
898  }
899 
901  GNUNET_free(buffer);
902 
903  return env;
904 }
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
static enum @8 mode
Should we do a PUT (mode = 0) or GET (mode = 1);.
const char * GNUNET_sh2s(const struct GNUNET_ShortHashCode *shc)
Convert a short hash value to a string (for printing debug messages).
@ GNUNET_ERROR_TYPE_DEBUG
#define GNUNET_MQ_msg_extra(mvar, esize, type)
Allocate an envelope, with extra space allocated after the space needed by the message struct.
Definition: gnunet_mq_lib.h:56
#define GNUNET_MESSAGE_TYPE_CADET_CLI
Traffic (net-cat style) used by the Command Line Interface.
void sign_message(struct GNUNET_MESSENGER_Message *message, uint16_t length, char *buffer, const struct GNUNET_HashCode *hash, const struct GNUNET_MESSENGER_Ego *ego)
Signs the hash of a message with a given ego and writes the signature into the buffer as well.
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 encode_message(const struct GNUNET_MESSENGER_Message *message, uint16_t length, char *buffer, int include_header)
Encodes a given message into a buffer of a maximal length in bytes.
uint16_t get_message_size(const struct GNUNET_MESSENGER_Message *message, int include_header)
Returns the exact size in bytes to encode a given message.
#define GNUNET_MESSENGER_PACK_MODE_ENVELOPE
uint32_t type
Type of public key.
Header for all communications.

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, GNUNET_MESSENGER_Ego::priv, GNUNET_MESSENGER_MessageHeader::sender_id, sign_message(), GNUNET_MESSENGER_MessageHeader::signature, GNUNET_IDENTITY_PrivateKey::type, and GNUNET_IDENTITY_Signature::type.

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

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◆ filter_message_sending()

int filter_message_sending ( const struct GNUNET_MESSENGER_Message message)

Returns if 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]messageMessage

Definition at line 907 of file messenger_api_message.c.

908 {
909  switch (message->header.kind)
910  {
912  return GNUNET_SYSERR; // Reserved for connection handling only!
914  return GNUNET_NO; // Use #GNUNET_MESSENGER_enter_room(...) instead!
916  return GNUNET_NO; // Use #GNUNET_MESSENGER_close_room(...) instead!
918  return GNUNET_YES;
920  return GNUNET_NO; // Use #GNUNET_MESSENGER_update(...) instead!
922  return GNUNET_NO; // Use #GNUNET_MESSENGER_open_room(...) instead!
924  return GNUNET_SYSERR; // Reserved for member id handling only!
926  return GNUNET_SYSERR; // Reserved for connection handling only!
928  return GNUNET_YES;
930  return GNUNET_YES;
932  return GNUNET_YES;
934  return GNUNET_YES;
936  return GNUNET_YES;
938  return GNUNET_NO; // Use #GNUNET_MESSENGER_send_message(...) with a contact instead!
940  return GNUNET_YES;
941  default:
942  return GNUNET_SYSERR;
943  }
944 }

Referenced by check_send_message(), and GNUNET_MESSENGER_send_message().

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