GNUnet  0.10.x
identity_api_lookup.c
Go to the documentation of this file.
1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2013 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet is distributed in the hope that it will be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19 */
20 
26 #include "platform.h"
27 #include "gnunet_util_lib.h"
29 #include "identity.h"
30 
31 #define LOG(kind, ...) GNUNET_log_from (kind, "identity-api", __VA_ARGS__)
32 
33 
38 {
39 
44 
48  char *name;
49 
54 
58  void *cb_cls;
59 };
60 
61 
70 static int
71 check_identity_result_code (void *cls, const struct ResultCodeMessage *rcm)
72 {
73  if (sizeof (*rcm) != htons (rcm->header.size))
75  return GNUNET_OK;
76 }
77 
78 
85 static void
86 handle_identity_result_code (void *cls, const struct ResultCodeMessage *rcm)
87 {
88  struct GNUNET_IDENTITY_EgoLookup *el = cls;
89 
90  el->cb (el->cb_cls, NULL);
92 }
93 
94 
102 static int
103 check_identity_update (void *cls, const struct UpdateMessage *um)
104 {
105  uint16_t size = ntohs (um->header.size);
106  uint16_t name_len = ntohs (um->name_len);
107  const char *str = (const char *) &um[1];
108 
109  if ((size != name_len + sizeof (struct UpdateMessage)) ||
110  ((0 != name_len) && ('\0' != str[name_len - 1])))
111  {
112  GNUNET_break (0);
113  return GNUNET_SYSERR;
114  }
115  return GNUNET_OK;
116 }
117 
118 
125 static void
126 handle_identity_update (void *cls, const struct UpdateMessage *um)
127 {
128  struct GNUNET_IDENTITY_EgoLookup *el = cls;
129  uint16_t name_len = ntohs (um->name_len);
130  const char *str = (0 == name_len) ? NULL : (const char *) &um[1];
131  struct GNUNET_CRYPTO_EcdsaPublicKey pub;
132  struct GNUNET_HashCode id;
133  struct GNUNET_IDENTITY_Ego ego;
134 
135  GNUNET_break (GNUNET_YES != ntohs (um->end_of_list));
137  GNUNET_CRYPTO_hash (&pub, sizeof (pub), &id);
138  ego.pk = (struct GNUNET_CRYPTO_EcdsaPrivateKey *) &um->private_key;
139  ego.name = (char *) str;
140  ego.id = id;
141  el->cb (el->cb_cls, &ego);
143 }
144 
145 
154 static void
155 mq_error_handler (void *cls, enum GNUNET_MQ_Error error)
156 {
157  struct GNUNET_IDENTITY_EgoLookup *el = cls;
158 
159  el->cb (el->cb_cls, NULL);
160 }
161 
162 
174  const char *name,
176  void *cb_cls)
177 {
179  struct GNUNET_MQ_Envelope *env;
180  struct GNUNET_MessageHeader *req;
181  size_t nlen;
182 
183  GNUNET_assert (NULL != cb);
185  el->cb = cb;
186  el->cb_cls = cb_cls;
187  {
188  struct GNUNET_MQ_MessageHandler handlers[] =
189  {GNUNET_MQ_hd_var_size (identity_result_code,
191  struct ResultCodeMessage,
192  el),
193  GNUNET_MQ_hd_var_size (identity_update,
195  struct UpdateMessage,
196  el),
198 
199  el->mq =
200  GNUNET_CLIENT_connect (cfg, "identity", handlers, &mq_error_handler, el);
201  }
202  if (NULL == el->mq)
203  {
204  GNUNET_break (0);
205  GNUNET_free (el);
206  return NULL;
207  }
208  el->name = GNUNET_strdup (name);
209  nlen = strlen (name) + 1;
211  memcpy (&req[1], name, nlen);
212  GNUNET_MQ_send (el->mq, env);
213  return el;
214 }
215 
216 
222 void
224 {
225  GNUNET_MQ_destroy (el->mq);
226  GNUNET_free (el->name);
227  GNUNET_free (el);
228 }
229 
230 
231 /* end of identity_api_lookup.c */
static void handle_identity_result_code(void *cls, const struct ResultCodeMessage *rcm)
We received a result code from the service.
void GNUNET_IDENTITY_ego_lookup_cancel(struct GNUNET_IDENTITY_EgoLookup *el)
Abort ego lookup attempt.
Handle for ego lookup.
Common type definitions for the identity service and API.
static struct GNUNET_IDENTITY_EgoLookup * el
EgoLookup.
struct GNUNET_MQ_Handle * GNUNET_CLIENT_connect(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *service_name, const struct GNUNET_MQ_MessageHandler *handlers, GNUNET_MQ_ErrorHandler error_handler, void *error_handler_cls)
Create a message queue to connect to a GNUnet service.
Definition: client.c:901
GNUNET_MQ_Error
Error codes for the queue.
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_IDENTITY_UPDATE.
Definition: identity.h:82
struct GNUNET_MQ_Handle * mq
Connection to service.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_IDENTITY_RESULT_CODE.
Definition: identity.h:47
struct GNUNET_CRYPTO_EcdsaPrivateKey private_key
The private key.
Definition: identity.h:98
#define GNUNET_MESSAGE_TYPE_IDENTITY_UPDATE
Update about identity status from service to clients.
static struct GNUNET_IDENTITY_Handle * id
Handle to identity service.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:78
#define GNUNET_new(type)
Allocate a struct or union of the given type.
Private ECC key encoded for transmission.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
static int check_identity_result_code(void *cls, const struct ResultCodeMessage *rcm)
We received a result code from the service.
char * name
Current name associated with this ego.
Definition: identity.h:255
#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:52
Handle for an ego.
Definition: identity.h:245
#define GNUNET_MQ_check_zero_termination(m)
Insert code for a "check_" function that verifies that a given variable-length message received over ...
#define GNUNET_MQ_hd_var_size(name, code, str, ctx)
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:44
#define GNUNET_MESSAGE_TYPE_IDENTITY_LOOKUP
First message send from identity client to service to lookup a single ego.
static int check_identity_update(void *cls, const struct UpdateMessage *um)
Check validity of identity update message.
static void mq_error_handler(void *cls, enum GNUNET_MQ_Error error)
Generic error handler, called with the appropriate error code and the same closure specified at the c...
A 512-bit hashcode.
Message handler for a specific message type.
static void handle_identity_update(void *cls, const struct UpdateMessage *um)
Handle identity update message.
struct GNUNET_HashCode id
Hash of the public key of this ego.
Definition: identity.h:265
static struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
Definition: gnunet-arm.c:104
void(* GNUNET_IDENTITY_EgoCallback)(void *cls, const struct GNUNET_IDENTITY_Ego *ego)
Function called with the result.
#define GNUNET_SYSERR
Definition: gnunet_common.h:79
static unsigned int size
Size of the "table".
Definition: peer.c:67
void GNUNET_CRYPTO_ecdsa_key_get_public(const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv, struct GNUNET_CRYPTO_EcdsaPublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:241
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
uint16_t name_len
Number of bytes in ego name string including 0-termination, in NBO; 0 if the ego was deleted...
Definition: identity.h:88
Handle to a message queue.
Definition: mq.c:85
struct GNUNET_IDENTITY_EgoLookup * GNUNET_IDENTITY_ego_lookup(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *name, GNUNET_IDENTITY_EgoCallback cb, void *cb_cls)
Lookup an ego by name.
configuration data
Definition: configuration.c:85
char * name
Name of the ego we are looking up.
uint16_t end_of_list
Usually GNUNET_NO, GNUNET_YES to signal end of list.
Definition: identity.h:93
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and ECDS...
GNUNET_IDENTITY_EgoCallback cb
Function to call with the result.
Header for all communications.
void GNUNET_MQ_destroy(struct GNUNET_MQ_Handle *mq)
Destroy the message queue.
Definition: mq.c:824
#define GNUNET_YES
Definition: gnunet_common.h:80
#define GNUNET_MESSAGE_TYPE_IDENTITY_RESULT_CODE
Generic response from identity service with success and/or error message.
void GNUNET_MQ_send(struct GNUNET_MQ_Handle *mq, struct GNUNET_MQ_Envelope *ev)
Send a message with the given message queue.
Definition: mq.c:353
void * cb_cls
Closure for cb.
struct GNUNET_CRYPTO_EcdsaPrivateKey * pk
Private key associated with this ego.
Definition: identity.h:250
#define GNUNET_MQ_handler_end()
End-marker for the handlers array.
Answer from service to client about last operation; GET_DEFAULT maybe answered with this message on f...
Definition: identity.h:42
Service informs client about status of a pseudonym.
Definition: identity.h:77
#define GNUNET_free(ptr)
Wrapper around free.