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tcp_server.c
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tcp_server.c
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/*
* If not stated otherwise in this file or this component's Licenses.txt file the
* following copyright and licenses apply:
*
* Copyright 2020 RDK Management
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <syslog.h>
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <unistd.h>
#include <string.h>
#include "tcp_server.h"
#include "json_rpc_common.h"
#include "utlist.h"
/**
* Pointer to hold client connection list.
**/
static client_list_t *g_client_list;
/**
* Global variable to store the server thread running status.
*/
static int g_rpc_server_running_status = FALSE;
/**
* @brief Server socket handler thread routine.
* @param Received filled rpc_server_data_t structure object (typecasted to void*) contains socket port and the callback functions needs to be execute
* once receive connection request, data from client side etc.
* This thread will exit when the terminate api invoked.
*/
static void *rpc_server_handler(void *arg);
int json_rpc_server_send_data(const int sockfd, const char *buffer)
{
POINTER_ASSERT(buffer != NULL);
int total_bytes_sent = 0; // how many bytes we've sent
int total_bytes_left = 0; // how many we have left to send
int ret = RETURN_OK;
total_bytes_left = strlen(buffer);
while (total_bytes_sent < total_bytes_left)
{
ret = send(sockfd, buffer + total_bytes_sent, total_bytes_left, 0);
if (ret == RETURN_ERR)
{
LOGERROR("Failed to send the response message over socket, [%d] bytes left to send", total_bytes_left);
return RETURN_ERR;
}
total_bytes_sent += ret;
total_bytes_left -= ret;
}
#ifdef DEBUG_ENABLED
LOGINFO("Response json message = %.*s", total_bytes_sent, buffer);
#endif
return RETURN_OK;
}
int json_rpc_server_run(rpc_server_data_t *server)
{
if (NULL == server)
{
LOGERROR("Invalid argument \n");
return RETURN_ERR;
}
int rc = RETURN_OK;
pthread_t socket_thread;
pthread_attr_t attributes;
pthread_attr_init(&attributes);
pthread_attr_setdetachstate(&attributes, PTHREAD_CREATE_DETACHED);
rc = pthread_create(&socket_thread, &attributes, rpc_server_handler, (void *)server);
if (rc != RETURN_OK)
{
LOGERROR("Failed to create server socket handler thread \n");
}
pthread_attr_destroy(&attributes);
return rc;
}
static void *rpc_server_handler(void *arg)
{
rpc_server_data_t *serverdata = NULL;
int i, len, rc, on = 1;
int listen_sd, max_sd, new_sd;
int desc_ready = FALSE;
char buffer[MAX_BUFFER_SIZE] = {"\0"};
struct sockaddr_in addr;
struct timeval timeout;
fd_set master_set, working_set;
if (arg == NULL)
{
LOGERROR("Invalid memory \n");
pthread_exit(0);
}
pthread_detach(pthread_self());
serverdata = (rpc_server_data_t *)arg;
g_client_list = NULL;
serverdata->running = TRUE;
listen_sd = socket(AF_INET, SOCK_STREAM, 0);
if (listen_sd < 0)
{
perror("socket() failed");
goto EXIT;
}
rc = setsockopt(listen_sd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on));
if (rc < 0)
{
perror("setsockopt() failed");
close(listen_sd);
goto EXIT;
}
rc = ioctl(listen_sd, FIONBIO, (char *)&on);
if (rc < 0)
{
perror("ioctl() failed");
close(listen_sd);
goto EXIT;
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr("127.0.0.1");
addr.sin_port = htons(serverdata->port);
rc = bind(listen_sd, (struct sockaddr *)&addr, sizeof(addr));
if (rc < 0)
{
perror("bind() failed");
close(listen_sd);
goto EXIT;
}
LOGINFO("server started at port %d \n", serverdata->port);
rc = listen(listen_sd, 32);
if (rc < 0)
{
perror("listen() failed");
close(listen_sd);
goto EXIT;
}
FD_ZERO(&master_set);
max_sd = listen_sd;
FD_SET(listen_sd, &master_set);
do
{
g_rpc_server_running_status = TRUE;
memcpy(&working_set, &master_set, sizeof(master_set));
/* Wait up to 50 milliseconds */
timeout.tv_sec = 0;
timeout.tv_usec = 50000;
rc = select(max_sd + 1, &working_set, NULL, NULL, &timeout);
if (rc < 0)
{
perror("select() failed");
break;
}
desc_ready = rc;
for (i = 0; i <= max_sd && desc_ready > 0; ++i)
{
if (FD_ISSET(i, &working_set))
{
desc_ready -= 1;
if (i == listen_sd)
{
new_sd = accept(listen_sd, NULL, NULL);
if (new_sd < 0)
{
if (errno != EWOULDBLOCK)
{
perror("accept() failed");
}
continue;
}
LOGINFO("New incoming connection - %d\r\n", new_sd);
/* Connect callback. */
if (serverdata->func_connect != NULL)
{
serverdata->func_connect(new_sd);
}
/* Store all the new client connection data into the list and update it into
* global list.
*/
client_list_t *conn = NULL;
conn = (client_list_t *)malloc(sizeof(client_list_t));
conn->fd = new_sd;
LL_APPEND(g_client_list, conn);
/* Update client fd into reading set. */
FD_SET(new_sd, &master_set);
if (new_sd > max_sd)
max_sd = new_sd;
}
else
{
memset(buffer, 0, MAX_BUFFER_SIZE);
/* Receive data from client. */
rc = recv(i, buffer, sizeof(buffer), 0);
if (rc < 0)
{
if (errno != EWOULDBLOCK)
{
perror(" recv() failed");
}
continue;
}
if (rc == 0)
{
LOGINFO("Connection closed on fd %d\n", i);
if (serverdata->func_disconnect != NULL)
{
serverdata->func_disconnect(i);
}
close(i);
FD_CLR(i, &master_set);
if (i == max_sd)
{
while (FD_ISSET(max_sd, &master_set) == FALSE)
max_sd -= 1;
}
/* Delete connection from the list once client got disconnected. */
client_list_t *tmp, *conn;
LL_FOREACH_SAFE(g_client_list, conn, tmp)
{
if (conn->fd == i)
{
LL_DELETE(g_client_list, conn);
free(conn);
}
}
continue;
}
/**********************************************/
/* Data was received */
/**********************************************/
len = rc;
if (serverdata->func_process != NULL)
{
serverdata->func_process(i, buffer, len);
}
} /* End of existing connection is readable */
} /* End of if (FD_ISSET(i, &working_set)) */
} /* End of loop through selectable descriptors */
} while (serverdata->running == TRUE);
for (i = 0; i <= max_sd; ++i)
{
if (FD_ISSET(i, &master_set))
{
LOGINFO("Closing client [%d] connection", i);
close(i);
}
}
g_rpc_server_running_status = FALSE;
EXIT:
pthread_exit(0);
}
/**
* @brief Utility API used to verify server socket thread is running or not.
* @return RETURN TRUE if server is running else FALSE returned.
*/
inline int json_rpc_server_is_running()
{
return g_rpc_server_running_status;
}