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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016-2017 by Marc Schink <dev@zapb.de>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdint.h>
#include <rtt/rtt.h>
#include "server.h"
#include "rtt_server.h"
/**
* @file
*
* RTT server.
*
* This server allows access to Real Time Transfer (RTT) channels via TCP
* connections.
*/
struct rtt_service {
unsigned int channel;
char *hello_message;
};
static int read_callback(unsigned int channel, const uint8_t *buffer,
size_t length, void *user_data)
{
int ret;
struct connection *connection;
size_t offset;
connection = (struct connection *)user_data;
offset = 0;
while (offset < length) {
ret = connection_write(connection, buffer + offset, length - offset);
if (ret < 0) {
LOG_ERROR("Failed to write data to socket.");
return ERROR_FAIL;
}
offset += ret;
}
return ERROR_OK;
}
static int rtt_new_connection(struct connection *connection)
{
int ret;
struct rtt_service *service;
service = connection->service->priv;
LOG_DEBUG("rtt: New connection for channel %u", service->channel);
ret = rtt_register_sink(service->channel, &read_callback, connection);
if (ret != ERROR_OK)
return ret;
if (service->hello_message)
connection_write(connection, service->hello_message, strlen(service->hello_message));
return ERROR_OK;
}
static int rtt_connection_closed(struct connection *connection)
{
struct rtt_service *service;
service = (struct rtt_service *)connection->service->priv;
rtt_unregister_sink(service->channel, &read_callback, connection);
LOG_DEBUG("rtt: Connection for channel %u closed", service->channel);
return ERROR_OK;
}
static int rtt_input(struct connection *connection)
{
int bytes_read;
unsigned char buffer[1024];
struct rtt_service *service;
size_t length;
service = (struct rtt_service *)connection->service->priv;
bytes_read = connection_read(connection, buffer, sizeof(buffer));
if (!bytes_read)
return ERROR_SERVER_REMOTE_CLOSED;
else if (bytes_read < 0) {
LOG_ERROR("error during read: %s", strerror(errno));
return ERROR_SERVER_REMOTE_CLOSED;
}
length = bytes_read;
rtt_write_channel(service->channel, buffer, &length);
return ERROR_OK;
}
static const struct service_driver rtt_service_driver = {
.name = "rtt",
.new_connection_during_keep_alive_handler = NULL,
.new_connection_handler = rtt_new_connection,
.input_handler = rtt_input,
.connection_closed_handler = rtt_connection_closed,
.keep_client_alive_handler = NULL,
};
COMMAND_HANDLER(handle_rtt_start_command)
{
int ret;
struct rtt_service *service;
if (CMD_ARGC < 2 || CMD_ARGC > 3)
return ERROR_COMMAND_SYNTAX_ERROR;
service = calloc(1, sizeof(struct rtt_service));
if (!service)
return ERROR_FAIL;
COMMAND_PARSE_NUMBER(uint, CMD_ARGV[1], service->channel);
if (CMD_ARGC >= 3) {
const char *hello_message = CMD_ARGV[2];
size_t hello_length = strlen(hello_message);
service->hello_message = malloc(hello_length + 2);
if (!service->hello_message) {
LOG_ERROR("Out of memory");
free(service);
return ERROR_FAIL;
}
strcpy(service->hello_message, hello_message);
service->hello_message[hello_length] = '\n';
service->hello_message[hello_length + 1] = '\0';
}
ret = add_service(&rtt_service_driver, CMD_ARGV[0], CONNECTION_LIMIT_UNLIMITED, service);
if (ret != ERROR_OK) {
free(service);
return ERROR_FAIL;
}
return ERROR_OK;
}
COMMAND_HANDLER(handle_rtt_stop_command)
{
if (CMD_ARGC != 1)
return ERROR_COMMAND_SYNTAX_ERROR;
remove_service("rtt", CMD_ARGV[0]);
return ERROR_OK;
}
static const struct command_registration rtt_server_subcommand_handlers[] = {
{
.name = "start",
.handler = handle_rtt_start_command,
.mode = COMMAND_ANY,
.help = "Start a RTT server",
.usage = "<port> <channel> [message]"
},
{
.name = "stop",
.handler = handle_rtt_stop_command,
.mode = COMMAND_ANY,
.help = "Stop a RTT server",
.usage = "<port>"
},
COMMAND_REGISTRATION_DONE
};
static const struct command_registration rtt_server_command_handlers[] = {
{
.name = "server",
.mode = COMMAND_ANY,
.help = "RTT server",
.usage = "",
.chain = rtt_server_subcommand_handlers
},
COMMAND_REGISTRATION_DONE
};
static const struct command_registration rtt_command_handlers[] = {
{
.name = "rtt",
.mode = COMMAND_ANY,
.help = "RTT",
.usage = "",
.chain = rtt_server_command_handlers
},
COMMAND_REGISTRATION_DONE
};
int rtt_server_register_commands(struct command_context *ctx)
{
return register_commands(ctx, NULL, rtt_command_handlers);
}
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