GNUnet  0.11.x
gnunet-messenger.c
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1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2020 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  */
26 #include <stdio.h>
27 
28 #include "platform.h"
29 #include "gnunet_util_lib.h"
31 
33 
42 void
43 on_message (void *cls, const struct GNUNET_MESSENGER_Room *room, const struct GNUNET_MESSENGER_Message *message,
44  const struct GNUNET_HashCode *hash)
45 {
46  struct GNUNET_MESSENGER_Contact *sender = GNUNET_MESSENGER_get_member (room, &(message->header.sender_id));
47 
48  const char *sender_name = GNUNET_MESSENGER_contact_get_name (sender);
49 
50  if (!sender_name)
51  sender_name = "anonymous";
52 
53  switch (message->header.kind)
54  {
56  {
57  printf ("* '%s' joined the room! [ %u %u %u %u ]\n", sender_name, message->body.join.key.ecdsa_key.q_y[0],
58  message->body.join.key.ecdsa_key.q_y[1], message->body.join.key.ecdsa_key.q_y[2],
59  message->body.join.key.ecdsa_key.q_y[3]);
60  break;
61  }
63  {
64  printf ("* '%s' leaves the room!\n", sender_name);
65  break;
66  }
68  {
69  printf ("* '%s' opened the room on: %s\n", sender_name, GNUNET_i2s_full (&(message->body.peer.peer)));
70  break;
71  }
73  {
74  printf ("* '%s' says: \"%s\"\n", sender_name, message->body.text.text);
75  break;
76  }
77  default:
78  {
79  break;
80  }
81  }
82 }
83 
85 
91 static void
92 shutdown_hook (void *cls)
93 {
94  struct GNUNET_MESSENGER_Room *room = cls;
95 
96  if (read_task)
97  GNUNET_SCHEDULER_cancel (read_task);
98 
99  if (room)
101 
102  if (messenger)
103  GNUNET_MESSENGER_disconnect (messenger);
104 }
105 
106 static void
107 listen_stdio (void *cls);
108 
109 #define MAX_BUFFER_SIZE 60000
110 
116 static void
117 read_stdio (void *cls)
118 {
119  read_task = NULL;
120 
121  char buffer[MAX_BUFFER_SIZE];
122  ssize_t length;
123 
124  length = read (0, buffer, MAX_BUFFER_SIZE);
125 
126  if ((length <= 0) || (length >= MAX_BUFFER_SIZE))
127  {
129  return;
130  }
131 
132  if (buffer[length - 1] == '\n')
133  buffer[length - 1] = '\0';
134  else
135  buffer[length] = '\0';
136 
137  struct GNUNET_MESSENGER_Room *room = cls;
138 
139  struct GNUNET_MESSENGER_Message message;
141  message.body.text.text = buffer;
142 
143  GNUNET_MESSENGER_send_message (room, &message);
144 
145  read_task = GNUNET_SCHEDULER_add_now (listen_stdio, cls);
146 }
147 
153 static void
154 listen_stdio (void *cls)
155 {
156  read_task = NULL;
157 
159 
161 
164  rs,
165  NULL,
166  &read_stdio, cls);
167 
169 }
170 
176 static void
177 idle (void *cls)
178 {
179  struct GNUNET_MESSENGER_Room *room = cls;
180 
181  printf ("* You joined the room.\n");
182 
183  read_task = GNUNET_SCHEDULER_add_now (listen_stdio, room);
184 }
185 
186 char *door_id;
187 char *ego_name;
188 char *room_key;
189 
191 
198 static void
200 {
201  struct GNUNET_HashCode key;
202  memset (&key, 0, sizeof(key));
203 
204  if (room_key)
205  GNUNET_CRYPTO_hash (room_key, strlen (room_key), &key);
206 
207  struct GNUNET_PeerIdentity *door = NULL;
208 
209  if (door_id)
210  {
211  door = GNUNET_new(struct GNUNET_PeerIdentity);
212 
214  {
215  GNUNET_free(door);
216  door = NULL;
217  }
218  }
219 
220  const char *name = GNUNET_MESSENGER_get_name (handle);
221 
222  if (!name)
223  name = "anonymous";
224 
225  printf ("* Welcome to the messenger, '%s'!\n", name);
226 
227  struct GNUNET_MESSENGER_Room *room;
228 
229  if (door)
230  {
231  printf ("* You try to entry a room...\n");
232 
233  room = GNUNET_MESSENGER_entry_room (messenger, door, &key);
234  }
235  else
236  {
237  printf ("* You try to open a room...\n");
238 
239  room = GNUNET_MESSENGER_open_room (messenger, &key);
240  }
241 
242  GNUNET_SCHEDULER_cancel (shutdown_task);
243 
244  shutdown_task = GNUNET_SCHEDULER_add_shutdown (shutdown_hook, room);
245 
246  if (!room)
248  else
250  room);
251 }
252 
261 static void
262 run (void *cls, char *const*args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *cfg)
263 {
264  messenger = GNUNET_MESSENGER_connect (cfg, ego_name, &on_identity, NULL, &on_message, NULL);
265 
266  shutdown_task = GNUNET_SCHEDULER_add_shutdown (shutdown_hook, NULL);
267 }
268 
276 int
277 main (int argc, char **argv)
278 {
279  const char *description = "Open and connect to rooms using the MESSENGER to chat.";
280 
281  struct GNUNET_GETOPT_CommandLineOption options[] = {
283  "door",
284  "PEERIDENTITY",
285  "peer identity to entry into the room",
286  &door_id),
288  "ego",
289  "IDENTITY",
290  "identity to use for messaging",
291  &ego_name),
293  "room",
294  "ROOMKEY",
295  "key of the room to connect to",
296  &room_key),
298 
299  return (GNUNET_OK == GNUNET_PROGRAM_run (argc,
300  argv,
301  "gnunet-messenger\0",
302  gettext_noop(description),
303  options,
304  &run,
305  NULL) ? EXIT_SUCCESS : EXIT_FAILURE);
306 }
struct GNUNET_PeerIdentity peer
The peer identity of the sender opening a room.
void GNUNET_MESSENGER_send_message(struct GNUNET_MESSENGER_Room *room, const struct GNUNET_MESSENGER_Message *message)
Send a message into a room.
struct GNUNET_MESSENGER_MessageHeader header
Header.
struct GNUNET_ShortHashCode sender_id
The senders id inside of the room the message was sent in.
struct GNUNET_MESSENGER_Room * GNUNET_MESSENGER_open_room(struct GNUNET_MESSENGER_Handle *handle, const struct GNUNET_HashCode *key)
Open a room to send and receive messages.
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration we are using.
Definition: gnunet-abd.c:36
void GNUNET_MESSENGER_close_room(struct GNUNET_MESSENGER_Room *room)
Close a room which was entered, opened or both in various order and variety.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed_with_priority(struct GNUNET_TIME_Relative delay, enum GNUNET_SCHEDULER_Priority priority, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1199
void GNUNET_NETWORK_fdset_set_native(struct GNUNET_NETWORK_FDSet *to, int nfd)
Set a native fd in a set.
Definition: network.c:1137
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_shutdown(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run on shutdown, that is when a CTRL-C signal is received, or when GNUNET_SCHEDULER_shutdown() is being invoked.
Definition: scheduler.c:1331
const char * GNUNET_MESSENGER_contact_get_name(const struct GNUNET_MESSENGER_Contact *contact)
Get the name used by the contact.
#define MAX_BUFFER_SIZE
struct GNUNET_MESSENGER_MessageText text
unsigned char q_y[256/8]
Q consists of an x- and a y-value, each mod p (256 bits), given here in affine coordinates and Ed2551...
void on_message(void *cls, const struct GNUNET_MESSENGER_Room *room, const struct GNUNET_MESSENGER_Message *message, const struct GNUNET_HashCode *hash)
Function called whenever a message is received or sent.
static void idle(void *cls)
Initial task to startup application.
const char * GNUNET_i2s_full(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
static void listen_stdio(void *cls)
Wait for input on STDIO and send it out over the ch.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
Definition of a command line option.
struct GNUNET_SCHEDULER_Task * shutdown_task
void GNUNET_SCHEDULER_shutdown(void)
Request the shutdown of a scheduler.
Definition: scheduler.c:531
char * text
The containing text.
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
static void run(void *cls, char *const *args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *cfg)
Main function that will be run by the scheduler.
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_option_string(char shortName, const char *name, const char *argumentHelp, const char *description, char **str)
Allow user to specify a string.
char * door_id
void GNUNET_NETWORK_fdset_destroy(struct GNUNET_NETWORK_FDSet *fds)
Releases the associated memory of an fd set.
Definition: network.c:1266
struct GNUNET_NETWORK_FDSet * GNUNET_NETWORK_fdset_create(void)
Creates an fd set.
Definition: network.c:1250
struct GNUNET_IDENTITY_PublicKey key
The senders public key to verify its signatures.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:48
struct GNUNET_TIME_Relative GNUNET_TIME_relative_get_zero_(void)
Return relative time of 0ms.
Definition: time.c:135
struct GNUNET_CRYPTO_EcdsaPublicKey ecdsa_key
An ECDSA identity key.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1296
struct GNUNET_MESSENGER_Room * GNUNET_MESSENGER_entry_room(struct GNUNET_MESSENGER_Handle *handle, const struct GNUNET_PeerIdentity *door, const struct GNUNET_HashCode *key)
Enter a room to send and receive messages through a door opened using GNUNET_MESSENGER_open_room(...).
struct GNUNET_MESSENGER_MessageBody body
Body.
collection of IO descriptors
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_select(enum GNUNET_SCHEDULER_Priority prio, struct GNUNET_TIME_Relative delay, const struct GNUNET_NETWORK_FDSet *rs, const struct GNUNET_NETWORK_FDSet *ws, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay or when any of the specified file descriptor set...
Definition: scheduler.c:1841
static struct GNUNET_DNS_Handle * handle
Handle to transport service.
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
static void read_stdio(void *cls)
Task run in stdio mode, after some data is available at stdin.
A 512-bit hashcode.
Run when otherwise idle.
struct GNUNET_MESSENGER_MessagePeer peer
int main(int argc, char **argv)
The main function to obtain messenger information.
char * ego_name
static void shutdown_hook(void *cls)
Task to shut down this application.
int GNUNET_CRYPTO_eddsa_public_key_from_string(const char *enc, size_t enclen, struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Convert a string representing a public key to a public key.
Definition: crypto_ecc.c:399
struct GNUNET_MESSENGER_Handle * messenger
The identity of the host (wraps the signing key of the peer).
struct GNUNET_MESSENGER_Handle * GNUNET_MESSENGER_connect(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *name, GNUNET_MESSENGER_IdentityCallback identity_callback, void *identity_cls, GNUNET_MESSENGER_MessageCallback msg_callback, void *msg_cls)
Set up a handle for the messenger related functions and connects to all necessary services...
configuration data
Definition: configuration.c:84
const char * name
void GNUNET_MESSENGER_disconnect(struct GNUNET_MESSENGER_Handle *handle)
Disconnect all of the messengers used services and clears up its used memory.
Entry in list of pending tasks.
Definition: scheduler.c:134
const char * GNUNET_MESSENGER_get_name(const struct GNUNET_MESSENGER_Handle *handle)
Get the name (if specified, otherwise NULL) used by the messenger.
int GNUNET_PROGRAM_run(int argc, char *const *argv, const char *binaryName, const char *binaryHelp, const struct GNUNET_GETOPT_CommandLineOption *options, GNUNET_PROGRAM_Main task, void *task_cls)
Run a standard GNUnet command startup sequence (initialize loggers and configuration, parse options).
Definition: program.c:372
struct GNUNET_SCHEDULER_Task * read_task
Run with the default priority (normal P2P operations).
char * room_key
struct GNUNET_MESSENGER_MessageJoin join
static void on_identity(void *cls, struct GNUNET_MESSENGER_Handle *handle)
Function called when an identity is retrieved.
struct GNUNET_MESSENGER_Contact * GNUNET_MESSENGER_get_member(const struct GNUNET_MESSENGER_Room *room, const struct GNUNET_ShortHashCode *id)
Get the contact of a member in a room identified by their id.
#define GNUNET_free(ptr)
Wrapper around free.
enum GNUNET_MESSENGER_MessageKind kind
The kind of the message.
struct GNUNET_CRYPTO_EddsaPublicKey public_key
#define gettext_noop(String)
Definition: gettext.h:69
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:972