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bd2c19d09a
antd-tunnel-publishers/wfifo/wfifo.c
lxsang bd2c19d09a minor fix on error handling
2020-08-09 13:04:20 +02:00

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/select.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <antd/list.h>
#include <antd/bst.h>
#include "../tunnel.h"
#define MODULE_NAME "wfifo"
static bst_node_t* clients = NULL;
static volatile int running = 1;
static void int_handler(int dummy) {
(void) dummy;
running = 0;
}
static void send_data(bst_node_t* node, void** argv, int argc)
{
(void)argc;
tunnel_msg_t* msg = (tunnel_msg_t*) argv[0];
int *fd = (int*) argv[1];
msg->header.client_id = node->key;
if(msg_write(*fd, msg) == -1)
{
M_ERROR(MODULE_NAME, "Unable to write data message to client %d", node->key);
}
}
static void unsubscribe(bst_node_t* node, void** args, int argc)
{
(void) argc;
tunnel_msg_t msg;
int* ufd = (int*) args[0];
msg.header.type = CHANNEL_UNSUBSCRIBE;
msg.header.client_id = node->key;
msg.header.size = 0;
if(msg_write(*ufd, &msg) == -1)
{
M_ERROR(MODULE_NAME, "Unable to request unsubscribe to client %d", node->key);
}
}
int main(int argc, char** argv)
{
int fd, fifo_fd;
tunnel_msg_t msg;
fd_set fd_in;
int status, maxfd;
struct timeval timeout;
char buff[BUFFLEN+1];
void* fargv[2];
uint8_t* tmp;
LOG_INIT(MODULE_NAME);
if(argc != 5)
{
printf("Usage: %s path/to/hotline/socket channel_name input_file\n", argv[0]);
return -1;
}
signal(SIGPIPE, SIG_IGN);
signal(SIGABRT, SIG_IGN);
signal(SIGINT, int_handler);
// create the fifo first
(void) unlink(argv[3]);
if(mkfifo(argv[3], 0666) == -1)
{
M_ERROR(MODULE_NAME, "Unable to create FIFO %s: %s", argv[3], strerror(errno));
return -1;
}
fifo_fd = open(argv[3], O_RDWR);
if(fifo_fd == -1)
{
M_ERROR(MODULE_NAME, "Unable to open FIFO %s: %s", argv[3], strerror(errno));
return -1;
}
M_LOG(MODULE_NAME, "FIFO: %s created", argv[3]);
M_LOG(MODULE_NAME, "Hotline is: %s", argv[1]);
// now try to request new channel from hotline
fd = open_unix_socket(argv[1]);
if(fd == -1)
{
M_ERROR(MODULE_NAME, "Unable to open the hotline: %s", argv[1]);
(void) close(fifo_fd);
return -1;
}
msg.header.type = CHANNEL_OPEN;
msg.header.channel_id = 0;
msg.header.client_id = 0;
M_LOG(MODULE_NAME, "Request to open the channel %s", argv[2]);
(void)strncpy(buff, argv[2],MAX_CHANNEL_NAME);
msg.header.size = strlen(buff);
msg.data = (uint8_t*) buff;
if(msg_write(fd, &msg) == -1)
{
M_ERROR(MODULE_NAME, "Unable to write message to hotline");
(void) close(fd);
(void) close(fifo_fd);
return -1;
}
M_LOG(MODULE_NAME, "Wait for comfirm creation of %s", argv[2]);
// now wait for message
if(msg_read(fd, &msg) == -1)
{
M_ERROR(MODULE_NAME, "Unable to read message from hotline");
(void) close(fd);
(void) close(fifo_fd);
return -1;
}
if(msg.header.type == CHANNEL_OK)
{
M_LOG(MODULE_NAME, "Channel created: %s", argv[2]);
if(msg.data)
free(msg.data);
}
else
{
M_ERROR(MODULE_NAME, "Channel is not created: %s. Tunnel service responds with msg of type %d", argv[2], msg.header.type);
if(msg.data)
free(msg.data);
running = 0;
}
// now read data
while(running)
{
timeout.tv_sec = 0;
timeout.tv_usec = 500;
FD_ZERO(&fd_in);
FD_SET(fd, &fd_in);
FD_SET(fifo_fd, &fd_in);
maxfd = fd > fifo_fd? fd: fifo_fd;
status = select(maxfd + 1, &fd_in, NULL, NULL, &timeout);
switch (status)
{
case -1:
M_LOG(MODULE_NAME, "Error %d on select()\n", errno);
running = 0;
break;
case 0:
timeout.tv_sec = 0;
timeout.tv_usec = 10000; // 5 ms
select(0, NULL, NULL, NULL, &timeout);
break;
// we have data
default:
if (FD_ISSET(fd, &fd_in))
{
if(msg_read(fd, &msg) == -1)
{
M_ERROR(MODULE_NAME, "Unable to read message from channel. quit");
running = 0;
}
else
{
switch (msg.header.type)
{
case CHANNEL_SUBSCRIBE:
M_LOG(MODULE_NAME, "Client %d subscribes to the chanel", msg.header.client_id);
clients = bst_insert(clients,msg.header.client_id, NULL);
break;
case CHANNEL_UNSUBSCRIBE:
M_LOG(MODULE_NAME, "Client %d unsubscribes to the chanel", msg.header.client_id);
clients = bst_delete(clients,msg.header.client_id);
break;
case CHANNEL_DATA:
if(argv[4][0] == 'w')
{
// write data to the FIFO
if(msg.header.size >0)
{
if( write(fifo_fd, msg.data, msg.header.size) == -1)
{
M_ERROR(MODULE_NAME, "Unable to write data to the FIFO %s from client %d: %s", argv[3], msg.header.client_id, strerror(errno));
running = 0;
}
}
}
else
{
(void)snprintf(buff, BUFFLEN, "Channel is read only");
msg.header.type = CHANNEL_ERROR;
msg.header.size = strlen(buff);
tmp = msg.data;
msg.data = (uint8_t*)buff;
if(msg_write(fd, &msg) == -1)
{
M_ERROR(MODULE_NAME, "Unable to write message to hotline");
running = 0;
}
msg.data = tmp;
M_ERROR(MODULE_NAME, "Channel is read only %s(%d)", argv[3], msg.header.client_id);
}
break;
default:
M_LOG(MODULE_NAME, "Client %d send message of type %d",
msg.header.client_id, msg.header.type);
break;
}
if(msg.data)
{
free(msg.data);
}
}
}
else if(FD_ISSET(fifo_fd, &fd_in) && argv[4][0] == 'r')
{
// on the fifo side
if((status = read(fifo_fd,buff, BUFFLEN)) == -1)
{
M_ERROR(MODULE_NAME, "Unable to read data from the FIFO %s: %s", argv[3], strerror(errno));
running = 0;
}
else
{
msg.header.type = CHANNEL_DATA;
msg.header.size = status;
msg.data = (uint8_t*)buff;
fargv[0] = (void*) &msg;
fargv[1] = (void*) &fd;
bst_for_each(clients, send_data, fargv, 2);
}
}
}
}
// unsubscribe all client
fargv[0] = (void*) &fd;
bst_for_each(clients, unsubscribe, fargv, 1);
// close the channel
M_LOG(MODULE_NAME, "Close the channel %s (%d)", argv[2], fd);
msg.header.type = CHANNEL_CLOSE;
msg.header.size = 0;
msg.data = NULL;
if( msg_write(fd, &msg) == -1)
{
M_ERROR(MODULE_NAME, "Unable to request channel close");
}
// close all opened terminal
(void)msg_read(fd, &msg);
(void) close(fd);
(void) close(fifo_fd);
return 0;
}
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