--- /dev/null
+/*
+
+ mybot.c
+
+ Author: Pekka Riikonen <priikone@silcnet.org>, November 2002
+ This code is Public Domain.
+
+ MyBot
+
+ Example SILC client called "mybot". It is a robot client which
+ connects to SILC Network into silc.silcnet.org server and joins
+ channel called "mybot" and says "hello" on the channel.
+
+ This code use the SILC Client Library provided by the SILC
+ Toolkit distribution.
+
+ Compilation:
+
+ gcc -o mybot mybot.c -I/usr/local/silc/include -L/usr/local/silc/lib \
+ -lsilc -lsilcclient -lpthread -ldl
+
+ The MyBot works as follows (logicly):
+
+ main -> mybot_start -> silc_client_connect_to_server
+ v
+ silc_client_run (message loop...)
+ v
+ silc_verify_public_key
+ v
+ silc_get_auth_method
+ v
+ silc_connected -> silc_client_send_command (JOIN)
+ v
+ silc_command_reply -> silc_send_channel_message ("hello")
+ v
+ message loop...
+ v
+ main <- mybot_start
+
+*/
+
+#include "silcincludes.h" /* Mandatory include for SILC applications */
+#include "silcclient.h" /* SILC Client Library API */
+
+SilcClientOperations ops;
+
+/******* MyBot code **********************************************************/
+
+/* This is context for our MyBot client */
+typedef struct {
+ SilcClient client; /* The actual SILC Client */
+ SilcClientConnection conn; /* Connection to the server */
+} *MyBot;
+
+/* Start the MyBot, by creating the SILC Client entity by using the
+ SILC Client Library API. */
+int mybot_start(void)
+{
+ MyBot mybot;
+
+ /* Allocate the MyBot structure */
+ mybot = silc_calloc(1, sizeof(*mybot));
+ if (!mybot) {
+ perror("Out of memory");
+ return 1;
+ }
+
+ /* Allocate our SILC Client which is the MyBot. The arguments to the
+ function are:
+
+ ops - our client operations that the library requires
+ param - parameters, but we don't have any so we pass NULL,
+ application - our application, ie. the MyBot of course!
+ version - silc version, provided by the library if we put NULL
+ */
+ mybot->client = silc_client_alloc(&ops, NULL, mybot,
+ /* NULL */"SILC-1.1-0.9.4");
+ if (!mybot->client) {
+ perror("Could not allocate SILC Client");
+ return 1;
+ }
+
+ /* Now fill the allocated client with mandatory parameters the library
+ requires: username, hostname and "real name". */
+ mybot->client->username = silc_get_username();
+ mybot->client->hostname = silc_net_localhost();
+ mybot->client->realname = strdup("I am the MyBot");
+
+ /* Now we initialize the client. */
+ if (!silc_client_init(mybot->client)) {
+ perror("Could not init client");
+ return 1;
+ }
+
+ /* Then we load our public key from the file. The library requires
+ the key pair loaded before the client is started. The SILC Toolkit
+ provides nice routines to do just that so we don't have to worry
+ about much.
+
+ Oh, and if the key pair doesn't exist, we create one here
+ automatically, and save them to files for future. */
+ if (!silc_load_key_pair("mybot.pub", "mybot.prv", NULL,
+ &mybot->client->pkcs,
+ &mybot->client->public_key,
+ &mybot->client->private_key)) {
+ /* The keys don't exist. Let's generate us a key pair then! There's
+ nice ready routine for that too. Let's do 2048 bit RSA key pair. */
+ fprintf(stdout, "MyBot: Key pair does not exist, generating it.\n");
+ if (!silc_create_key_pair("rsa", 2048, "mybot.pub", "mybot.prv", NULL,
+ NULL, &mybot->client->pkcs,
+ &mybot->client->public_key,
+ &mybot->client->private_key, FALSE)) {
+ perror("Could not generated key pair");
+ return 1;
+ }
+ }
+
+ /* Start connecting to server. This is asynchronous connecting so the
+ connection is actually created later after we run the client. */
+ silc_client_connect_to_server(mybot->client, NULL, 706,
+ "silc.silcnet.org", mybot);
+
+ /* And, then we are ready to go. Since we are really simple client we
+ don't have user interface and we don't have to deal with message loops
+ or interactivity. That's why we can just hand over the execution
+ to the library by calling silc_client_run. */
+ silc_client_run(mybot->client);
+
+ /* When we get here, we have quit the client, so clean up and exit */
+ silc_client_free(mybot->client);
+ silc_free(mybot);
+ return 0;
+}
+
+/******* SILC Client Operations **********************************************/
+
+/* The SILC Client Library requires these "client operations". They are
+ functions that the library may call at any time to indicate to application
+ that something happened, like message was received, or authentication
+ is required or something else. Since our MyBot is really simple client
+ we don't need most of the operations, so we just define them and don't
+ do anything in them. */
+
+/* "say" client operation is a message from the client library to the
+ application. It may include error messages or something else. We
+ just dump them to screen. */
+
+static void
+silc_say(SilcClient client, SilcClientConnection conn,
+ SilcClientMessageType type, char *msg, ...)
+{
+ char str[200];
+ va_list va;
+ va_start(va, msg);
+ vsnprintf(str, sizeof(str) - 1, msg, va);
+ fprintf(stdout, "MyBot: %s\n", str);
+ va_end(va);
+}
+
+
+/* Message for a channel. The `sender' is the sender of the message
+ The `channel' is the channel. The `message' is the message. Note
+ that `message' maybe NULL. The `flags' indicates message flags
+ and it is used to determine how the message can be interpreted
+ (like it may tell the message is multimedia message). */
+
+static void
+silc_channel_message(SilcClient client, SilcClientConnection conn,
+ SilcClientEntry sender, SilcChannelEntry channel,
+ SilcMessageFlags flags, const unsigned char *message,
+ SilcUInt32 message_len)
+{
+ /* Yay! We got a message from channel. */
+ fprintf(stdout, "<%s> %s\n", sender->nickname, message);
+}
+
+
+/* Private message to the client. The `sender' is the sender of the
+ message. The message is `message'and maybe NULL. The `flags'
+ indicates message flags and it is used to determine how the message
+ can be interpreted (like it may tell the message is multimedia
+ message). */
+
+static void
+silc_private_message(SilcClient client, SilcClientConnection conn,
+ SilcClientEntry sender, SilcMessageFlags flags,
+ const unsigned char *message,
+ SilcUInt32 message_len)
+{
+ /* MyBot does not support private message receiving */
+}
+
+
+/* Notify message to the client. The notify arguments are sent in the
+ same order as servers sends them. The arguments are same as received
+ from the server except for ID's. If ID is received application receives
+ the corresponding entry to the ID. For example, if Client ID is received
+ application receives SilcClientEntry. Also, if the notify type is
+ for channel the channel entry is sent to application (even if server
+ does not send it because client library gets the channel entry from
+ the Channel ID in the packet's header). */
+
+static void
+silc_notify(SilcClient client, SilcClientConnection conn,
+ SilcNotifyType type, ...)
+{
+ char *str;
+ va_list va;
+
+ va_start(va, type);
+
+ /* Here we can receive all kinds of different data from the server, but
+ our simple bot is interested only in receiving the "not-so-important"
+ stuff, just for fun. :) */
+ switch (type) {
+ case SILC_NOTIFY_TYPE_NONE:
+ /* Received something that we are just going to dump to screen. */
+ str = va_arg(va, char *);
+ fprintf(stdout, "--- %s\n", str);
+ break;
+
+ case SILC_NOTIFY_TYPE_MOTD:
+ /* Received the Message of the Day from the server. */
+ str = va_arg(va, char *);
+ fprintf(stdout, "%s", str);
+ fprintf(stdout, "\n");
+ break;
+
+ default:
+ /* Ignore rest */
+ break;
+ }
+
+ va_end(va);
+}
+
+
+/* Command handler. This function is called always in the command function.
+ If error occurs it will be called as well. `conn' is the associated
+ client connection. `cmd_context' is the command context that was
+ originally sent to the command. `success' is FALSE if error occurred
+ during command. `command' is the command being processed. It must be
+ noted that this is not reply from server. This is merely called just
+ after application has called the command. Just to tell application
+ that the command really was processed. */
+
+static void
+silc_command(SilcClient client, SilcClientConnection conn,
+ SilcClientCommandContext cmd_context, bool success,
+ SilcCommand command, SilcStatus status)
+{
+ /* If error occurred in client library with our command, print the error */
+ if (status != SILC_STATUS_OK)
+ fprintf(stderr, "MyBot: COMMAND %s: %s\n",
+ silc_get_command_name(command),
+ silc_get_status_message(status));
+}
+
+
+/* Command reply handler. This function is called always in the command reply
+ function. If error occurs it will be called as well. Normal scenario
+ is that it will be called after the received command data has been parsed
+ and processed. The function is used to pass the received command data to
+ the application.
+
+ `conn' is the associated client connection. `cmd_payload' is the command
+ payload data received from server and it can be ignored. It is provided
+ if the application would like to re-parse the received command data,
+ however, it must be noted that the data is parsed already by the library
+ thus the payload can be ignored. `success' is FALSE if error occurred.
+ In this case arguments are not sent to the application. The `status' is
+ the command reply status server returned. The `command' is the command
+ reply being processed. The function has variable argument list and each
+ command defines the number and type of arguments it passes to the
+ application (on error they are not sent). */
+
+static void
+silc_command_reply(SilcClient client, SilcClientConnection conn,
+ SilcCommandPayload cmd_payload, bool success,
+ SilcCommand command, SilcStatus status, ...)
+{
+ va_list va;
+
+ /* If error occurred in client library with our command, print the error */
+ if (status != SILC_STATUS_OK)
+ fprintf(stderr, "MyBot: COMMAND REPLY %s: %s\n",
+ silc_get_command_name(command),
+ silc_get_status_message(status));
+
+ va_start(va, status);
+
+ /* Check for successful JOIN */
+ if (command == SILC_COMMAND_JOIN) {
+ SilcChannelEntry channel;
+
+ (void)va_arg(va, SilcClientEntry);
+ channel = va_arg(va, SilcChannelEntry);
+
+ fprintf(stdout, "MyBot: Joined '%s' channel\n", channel->channel_name);
+
+ /* Now send the "hello" to the channel */
+ silc_client_send_channel_message(client, conn, channel, NULL, 0,
+ "hello", strlen("hello"), FALSE);
+ fprintf(stdout, "MyBot: Sent 'hello' to channel\n");
+ }
+
+ va_end(va);
+}
+
+
+/* Called to indicate that connection was either successfully established
+ or connecting failed. This is also the first time application receives
+ the SilcClientConnection objecet which it should save somewhere.
+ If the `success' is FALSE the application must always call the function
+ silc_client_close_connection. */
+
+static void
+silc_connected(SilcClient client, SilcClientConnection conn,
+ SilcClientConnectionStatus status)
+{
+ MyBot mybot = client->application;
+ SilcBuffer idp;
+
+ if (status == SILC_CLIENT_CONN_ERROR) {
+ fprintf(stderr, "MyBot: Could not connect to server\n");
+ silc_client_close_connection(client, conn);
+ return;
+ }
+
+ fprintf(stdout, "MyBot: Connected to server.\n");
+
+ /* Save the connection context */
+ mybot->conn = conn;
+
+ /* Now that we are connected, send the JOIN command to the "mybot"
+ channel */
+ idp = silc_id_payload_encode(conn->local_id, SILC_ID_CLIENT);
+ silc_client_command_send(client, conn, SILC_COMMAND_JOIN, 0, 2,
+ 1, "mybot", strlen("mybot"),
+ 2, idp->data, idp->len);
+ silc_buffer_free(idp);
+}
+
+
+/* Called to indicate that connection was disconnected to the server.
+ The `status' may tell the reason of the disconnection, and if the
+ `message' is non-NULL it may include the disconnection message
+ received from server. */
+
+static void
+silc_disconnected(SilcClient client, SilcClientConnection conn,
+ SilcStatus status, const char *message)
+{
+ MyBot mybot = client->application;
+
+ /* We got disconnected from server */
+ mybot->conn = NULL;
+ fprintf(stdout, "MyBot: %s:%s\n", silc_get_status_message(status),
+ message);
+}
+
+
+/* Find authentication method and authentication data by hostname and
+ port. The hostname may be IP address as well. When the authentication
+ method has been resolved the `completion' callback with the found
+ authentication method and authentication data is called. The `conn'
+ may be NULL. */
+
+static void
+silc_get_auth_method(SilcClient client, SilcClientConnection conn,
+ char *hostname, SilcUInt16 port,
+ SilcGetAuthMeth completion,
+ void *context)
+{
+ /* MyBot assumes that there is no authentication requirement in the
+ server and sends nothing as authentication. We just reply with
+ TRUE, meaning we know what is the authentication method. :). */
+ completion(TRUE, SILC_AUTH_NONE, NULL, 0, context);
+}
+
+
+/* Verifies received public key. The `conn_type' indicates which entity
+ (server, client etc.) has sent the public key. If user decides to trust
+ the application may save the key as trusted public key for later
+ use. The `completion' must be called after the public key has been
+ verified. */
+
+static void
+silc_verify_public_key(SilcClient client, SilcClientConnection conn,
+ SilcSocketType conn_type, unsigned char *pk,
+ SilcUInt32 pk_len, SilcSKEPKType pk_type,
+ SilcVerifyPublicKey completion, void *context)
+{
+ /* MyBot is also very trusting, so we just accept the public key
+ we get here. Of course, we would have to verify the authenticity
+ of the public key but our bot is too simple for that. We just
+ reply with TRUE, meaning "yeah, we trust it". :) */
+ completion(TRUE, context);
+}
+
+
+/* Ask (interact, that is) a passphrase from user. The passphrase is
+ returned to the library by calling the `completion' callback with
+ the `context'. The returned passphrase SHOULD be in UTF-8 encoded,
+ if not then the library will attempt to encode. */
+
+static void
+silc_ask_passphrase(SilcClient client, SilcClientConnection conn,
+ SilcAskPassphrase completion, void *context)
+{
+ /* MyBot does not support asking passphrases from users since there
+ is no user in our little client. We just reply with nothing. */
+ completion(NULL, 0, context);
+}
+
+
+/* Notifies application that failure packet was received. This is called
+ if there is some protocol active in the client. The `protocol' is the
+ protocol context. The `failure' is opaque pointer to the failure
+ indication. Note, that the `failure' is protocol dependant and
+ application must explicitly cast it to correct type. Usually `failure'
+ is 32 bit failure type (see protocol specs for all protocol failure
+ types). */
+
+static void
+silc_failure(SilcClient client, SilcClientConnection conn,
+ SilcProtocol protocol, void *failure)
+{
+ /* Well, something bad must have happened during connecting to the
+ server since we got here. Let's just print that something failed.
+ The "failure" would include more information but let's not bother
+ with that now. */
+ fprintf(stderr, "MyBot: Connecting failed (protocol failure)\n");
+}
+
+
+/* Asks whether the user would like to perform the key agreement protocol.
+ This is called after we have received an key agreement packet or an
+ reply to our key agreement packet. This returns TRUE if the user wants
+ the library to perform the key agreement protocol and FALSE if it is not
+ desired (application may start it later by calling the function
+ silc_client_perform_key_agreement). If TRUE is returned also the
+ `completion' and `context' arguments must be set by the application. */
+
+static bool
+silc_key_agreement(SilcClient client, SilcClientConnection conn,
+ SilcClientEntry client_entry, const char *hostname,
+ SilcUInt16 port, SilcKeyAgreementCallback *completion,
+ void **context)
+{
+ /* MyBot does not support incoming key agreement protocols, it's too
+ simple for that. */
+ return FALSE;
+}
+
+
+/* Notifies application that file transfer protocol session is being
+ requested by the remote client indicated by the `client_entry' from
+ the `hostname' and `port'. The `session_id' is the file transfer
+ session and it can be used to either accept or reject the file
+ transfer request, by calling the silc_client_file_receive or
+ silc_client_file_close, respectively. */
+
+static void
+silc_ftp(SilcClient client, SilcClientConnection conn,
+ SilcClientEntry client_entry, SilcUInt32 session_id,
+ const char *hostname, SilcUInt16 port)
+{
+ /* MyBot does not support file transfer, it's too simple for that too. */
+}
+
+
+/* Delivers SILC session detachment data indicated by `detach_data' to the
+ application. If application has issued SILC_COMMAND_DETACH command
+ the client session in the SILC network is not quit. The client remains
+ in the network but is detached. The detachment data may be used later
+ to resume the session in the SILC Network. The appliation is
+ responsible of saving the `detach_data', to for example in a file.
+
+ The detachment data can be given as argument to the functions
+ silc_client_connect_to_server, or silc_client_add_connection when
+ creating connection to remote server, inside SilcClientConnectionParams
+ structure. If it is provided the client library will attempt to resume
+ the session in the network. After the connection is created
+ successfully, the application is responsible of setting the user
+ interface for user into the same state it was before detaching (showing
+ same channels, channel modes, etc). It can do this by fetching the
+ information (like joined channels) from the client library. */
+
+static void
+silc_detach(SilcClient client, SilcClientConnection conn,
+ const unsigned char *detach_data, SilcUInt32 detach_data_len)
+{
+ /* Oh, and MyBot does not support session detaching either. */
+}
+
+/* Our client operations for the MyBot. This structure is filled with
+ functions and given as argument to the silc_client_alloc function.
+ Even though our little bot does not need all these functions we must
+ provide them since the SILC Client Library wants them all. */
+/* This structure and all the functions were taken from the
+ lib/silcclient/client_ops_example.c. */
+SilcClientOperations ops = {
+ silc_say,
+ silc_channel_message,
+ silc_private_message,
+ silc_notify,
+ silc_command,
+ silc_command_reply,
+ silc_connected,
+ silc_disconnected,
+ silc_get_auth_method,
+ silc_verify_public_key,
+ silc_ask_passphrase,
+ silc_failure,
+ silc_key_agreement,
+ silc_ftp,
+ silc_detach
+};
+
+int main(int argc, char **argv)
+{
+ /* Start the bot */
+ return mybot_start();
+}
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