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lxsang 2020-08-03 00:54:08 +02:00
parent eb085f27a4
commit a5aa4bd913
4 changed files with 716 additions and 120 deletions
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2
Makefile.am
View File

@ -14,6 +14,6 @@ AM_CPPFLAGS += -W -Wall -g -std=c99 -fPIC
lib_LTLIBRARIES = tunnel.la
wterm_la_LDFLAGS = -module -avoid-version -shared
wterm_la_SOURCES = tunnel.c
wterm_la_SOURCES = tunnel.c bst.c
EXTRA_DIST = README.md

100
bst.c Normal file
View File

@ -0,0 +1,100 @@
#include<stdio.h>
#include<stdlib.h>
#include "bst.h"
void bst_free(bst_node_t* root)
{
if(root != NULL)
{
bst_free(root->left);
bst_free(root->right);
free(root);
}
}
bst_node_t* bst_insert(bst_node_t* root, int key, void* data)
{
if(root == NULL)
{
root = malloc(sizeof(bst_node_t));
root->key = key;
root->data = data;
root->left = root->right = NULL;
}
else if(key < root->key)
root->left = insert(root->left, key, data);
else if(key > root->key)
root->right = insert(root->right, key, data);
return root;
}
bst_node_t* bst_find_min(bst_node_t* root)
{
if(root == NULL)
return NULL;
else if(root->left == NULL)
return root;
else
return bst_find_min(root->left);
}
bst_node_t* bst_find_max(bst_node_t* root)
{
if(root == NULL)
return NULL;
else if(root->right == NULL)
return root;
else
return bst_find_max(root->right);
}
bst_node_t* bst_find(bst_node_t* root, int x)
{
if(root == NULL)
return NULL;
else if(x < root->key)
return find(root->left, x);
else if(x > root->key)
return find(root->right, x);
else
return root;
}
bst_node_t* bst_delete(bst_node_t* root, int x)
{
bst_node_t* temp;
if(root == NULL)
return NULL;
else if(x < root->key)
root->left = delete(root->left, x);
else if(x > root->key)
root->right = delete(root->right, x);
else if(root->left && root->right)
{
temp = bst_find_min(root->right);
root->key = temp->key;
root->data = temp->data;
root->right = delete(root->right, root->key);
}
else
{
temp = root;
if(root->left == NULL)
root = root->right;
else if(root->right == NULL)
root = root->left;
free(temp);
}
return root;
}
void bst_for_each(bst_node_t* root, void (*callback)(bst_node_t*, void **, int), void** args, int argc)
{
if(root == NULL)
return;
bst_for_each(root->left, callback, args, argc);
callback(root, args, argc);
bst_for_each(root->right, callback, args, argc);
}

19
bst.h Normal file
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@ -0,0 +1,19 @@
#ifndef BST_H
#define BST_H 1
typedef struct _tree_node
{
int key;
void* data;
struct _tree_node* left;
struct _tree_node* right;
} bst_node_t;
void bst_free(bst_node_t* root);
bst_node_t* bst_insert(bst_node_t* root, int key, void* data);
bst_node_t* bst_find_min(bst_node_t* root);
bst_node_t* bst_find_max(bst_node_t* root);
bst_node_t* bst_find(bst_node_t* root, int x);
bst_node_t* bst_delete(bst_node_t* root, int x);
void bst_for_each(bst_node_t* root, void (*callback)(bst_node_t*, void **, int), void** args, int argc);
#endif

715
tunnel.c
View File

@ -11,12 +11,14 @@
#include <sys/socket.h>
#include <sys/un.h>
#define MAX_CHANNEL_PATH 108
#define MAX_CHANNEL_NAME 64
#define HOT_LINE_SOCKET "antd_hotline.sock"
#define SOCK_DIR_NAME "channels"
#define MSG_MAGIC_BEGIN 0x414e5444 //ANTD
#define MSG_MAGIC_END 0x44544e41 //DTNA
#include "bst.h"
#define MAX_CHANNEL_PATH 108
#define MAX_CHANNEL_NAME 64
#define HOT_LINE_SOCKET "antd_hotline.sock"
#define SOCK_DIR_NAME "channels"
#define MSG_MAGIC_BEGIN 0x414e5444 //ANTD
#define MSG_MAGIC_END 0x44544e41 //DTNA
#define SELECT_TIMEOUT 300 // ms
#define CHANNEL_OK (uint8_t)0x0
#define CHANNEL_ERROR (uint8_t)0x1
@ -25,17 +27,19 @@
#define CHANNEL_OPEN (uint8_t)0x4
#define CHANNEL_CLOSE (uint8_t)0x5
#define CHANNEL_DATA (uint8_t)0x6
//#define CHANNEL_LIST (uint8_t)0x7
typedef struct {
int sock;
char sun_path[MAX_CHANNEL_PATH];
list_t subscribers;
char name[MAX_CHANNEL_NAME];
bst_node_t* subscribers;
} antd_tunnel_channel_t;
typedef struct {
uint8_t type;
int channel_id;
int client_id;
int size;
char channel[MAX_CHANNEL_NAME];
} antd_tunnel_msg_h_t;
typedef struct{
@ -44,19 +48,67 @@ typedef struct{
} antd_tunnel_msg_t;
/**
* Message is sent in the following format
* |BEGIN MAGIC(4)|MSG TYPE(1)| CHANNEL LENGTH (1)| CHANNEL(n)| data length (4)| data(m) | END MAGIC(4)|
* |BEGIN MAGIC(4)|MSG TYPE(1)| CHANNEL ID (4)| CLIENT ID (4)| data length (4)| data(m) | END MAGIC(4)|
*/
typedef struct {
pthread_mutex_t lock;
dictionary_t channels;
bst_node_t* channels;
pthread_t tid;
int hotline;
uint32_t id_allocator;
} antd_tunnel_t;
static antd_tunnel_t g_tunnel;
static int subscribe_to(const char* channel, antd_request_t* identifier);
static int mk_socket(const char* name, char* path)
{
struct sockaddr_un address;
address.sun_family = AF_UNIX;
// create the socket
(void)snprintf(path, MAX_CHANNEL_PATH,"%s/%s/",__plugin__.tmpdir, SOCK_DIR_NAME);
if(!_exist(path))
{
LOG("Socket dir does not exist, create it: %s",path);
if(mkdir(path, 0700) == -1)
{
ERROR("Unable to create socket dir: %s =", strerror(errno));
return -1;
}
}
// Append the name of the socket
if(strlen(path) + strlen(name) > MAX_CHANNEL_PATH)
{
ERROR("Socket file path exceeds the maximal size of: %d", MAX_CHANNEL_PATH);
return -1;
}
(void)strcat(path, HOT_LINE_SOCKET);
(void) strncpy(address.sun_path, path, sizeof(address.sun_path));
int fd = socket(AF_UNIX, SOCK_STREAM, 0);
if(fd == -1)
{
ERROR("Unable to create Unix domain socket: %s", strerror(errno));
return -1;
}
if(bind(fd, (struct sockaddr*)(&address), sizeof(address)) == -1)
{
ERROR("Unable to bind name: %s to a socket: %s", address.sun_path, strerror(errno));
return -1;
}
// mark the socket as passive mode
if(listen(fd , 100) == -1)
{
ERROR("Unable to listen to socket: %d (%s): %s",fd, path , strerror(errno));
return -1;
}
LOG("Socket %s is created successfully", path);
return fd;
}
static int msg_check_number(int fd, int number)
{
@ -97,11 +149,16 @@ static int msg_read_string(int fd, char* buffer, uint8_t max_length)
static char* msg_read_payload(int fd, int* size)
{
char* data;
if(read(fd,size,sizeof(size)) == -1)
if(read(fd,size,sizeof(*size)) == -1)
{
ERROR("Unable to read payload data size: %s", strerror(errno));
return NULL;
}
if(size <= 0)
{
return NULL;
}
data = (char*) malloc(*size);
if(data == NULL)
{
@ -134,9 +191,14 @@ static int msg_read(int fd, antd_tunnel_msg_t* msg)
ERROR("Unknown msg type: %d", msg->header.type);
return -1;
}
if(msg_read_string(fd, msg->header.channel,MAX_CHANNEL_NAME) == -1)
if(read(fd, &msg->header.channel_id, sizeof(msg->header.channel_id)) == -1)
{
ERROR("Unable to read msg channel");
ERROR("Unable to read msg channel id");
return -1;
}
if(read(fd, &msg->header.client_id, sizeof(msg->header.client_id)) == -1)
{
ERROR("Unable to read msg client id");
return -1;
}
if((msg->data = msg_read_payload(fd, &msg->header.size)) == NULL)
@ -160,7 +222,6 @@ static int msg_write(int fd, antd_tunnel_msg_t* msg)
{
// write begin magic number
int number = MSG_MAGIC_BEGIN;
uint8_t slen;
if(write(fd,&number, sizeof(number)) == -1)
{
ERROR("Unable to write begin magic number: %s", strerror(errno));
@ -172,17 +233,16 @@ static int msg_write(int fd, antd_tunnel_msg_t* msg)
ERROR("Unable to write msg type: %s", strerror(errno));
return -1;
}
// write channel len
slen = strlen(msg->header.channel);
if(write(fd,&slen, sizeof(slen)) == -1)
// write channel id
if(write(fd,&msg->header.channel_id, sizeof(msg->header.channel_id)) == -1)
{
ERROR("Unable to write msg channel len: %s", strerror(errno));
ERROR("Unable to write msg channel id: %s", strerror(errno));
return -1;
}
//write channel.
if(write(fd,msg->header.channel, slen) == -1)
//write client id
if(write(fd,&msg->header.client_id, sizeof(msg->header.client_id)) == -1)
{
ERROR("Unable to write msg channel: %s", strerror(errno));
ERROR("Unable to write msg client id: %s", strerror(errno));
return -1;
}
// write payload len
@ -192,20 +252,304 @@ static int msg_write(int fd, antd_tunnel_msg_t* msg)
return -1;
}
// write payload data
if(write(fd,msg->data, msg->header.size) == -1)
if(msg->header.size > 0)
{
ERROR("Unable to write msg payload: %s", strerror(errno));
return -1;
if(write(fd,msg->data, msg->header.size) == -1)
{
ERROR("Unable to write msg payload: %s", strerror(errno));
return -1;
}
}
number = MSG_MAGIC_END;
if(write(fd,&number, sizeof(number)) == -1)
{
ERROR("Unable to write begin end number: %s", strerror(errno));
ERROR("Unable to write end magic number: %s", strerror(errno));
return -1;
}
return 0;
}
static void destroy_channel(antd_tunnel_channel_t* channel)
{
if(channel->sock != -1)
{
(void) close(channel->sock);
(void)unlink(channel->sun_path);
}
/** TODO: send message to all subcribers before close*/
bst_free(channel->subscribers);
}
static void channel_open(int fd, const char* name)
{
char buffer[BUFFLEN];
antd_tunnel_channel_t* channel = NULL;
bst_node_t* node;
int hash_val = simple_hash(name);
antd_tunnel_msg_t msg;
msg.data = buffer;
msg.header.channel_id = 0;
msg.header.client_id = 0;
// look if the channel is already opened
if(g_tunnel.channels != NULL)
{
pthread_mutex_lock(&g_tunnel.lock);
node = bst_find(g_tunnel.channels, hash_val);
pthread_mutex_unlock(&g_tunnel.lock);
if(node != NULL)
{
snprintf(buffer, BUFFLEN, "Cannot open new channel: channel %s exists", name);
LOG("%s", buffer);
msg.header.type = CHANNEL_ERROR;
msg.header.size = strlen(buffer);
if(msg_write(fd, &msg) == -1)
{
ERROR("Unable to write message to hotline");
}
return;
}
}
// create new channel
channel = (antd_tunnel_channel_t*)malloc(sizeof(antd_tunnel_channel_t));
if(channel == NULL)
{
snprintf(buffer, BUFFLEN, "Unable to allocate new memory for new channel");
LOG("%s", buffer);
msg.header.type = CHANNEL_ERROR;
msg.header.size = strlen(buffer);
if(msg_write(fd, &msg) == -1)
{
ERROR("Unable to write message to hotline");
}
return;
}
// create socket file
(void)strncpy(channel->name, name, MAX_CHANNEL_NAME);
channel->sock = mk_socket(name, channel->sun_path);
if(channel->sock == -1)
{
snprintf(buffer, BUFFLEN, "Unable to create socket");
msg.header.type = CHANNEL_ERROR;
msg.header.size = strlen(buffer);
free(channel);
if(msg_write(fd, &msg) == -1)
{
ERROR("Unable to write message to hotline");
}
return;
}
// response with ok message
msg.header.type = CHANNEL_OK;
msg.header.channel_id = hash_val;
msg.header.size = strlen(channel->sun_path);
msg.data = channel->sun_path;
if(msg_write(fd, &msg) == -1)
{
destroy_channel(channel);
ERROR("Unable to write message to hotline");
}
// channel created
pthread_mutex_lock(&g_tunnel.lock);
g_tunnel.channels = bst_insert(g_tunnel.channels, hash_val, (void*) channel);
pthread_mutex_unlock(&g_tunnel.lock);
}
static void channel_close(int fd, const char* name)
{
char buffer[BUFFLEN];
antd_tunnel_msg_t msg;
bst_node_t* node;
int hash_val = simple_hash(name);
msg.data = buffer;
msg.header.channel_id = 0;
msg.header.client_id = 0;
// look for the channel
if(g_tunnel.channels != NULL)
{
pthread_mutex_lock(&g_tunnel.lock);
node = bst_find(g_tunnel.channels, hash_val);
if(node)
{
destroy_channel((antd_tunnel_channel_t*)node->data);
}
msg.header.channel_id = node->key;
g_tunnel.channels = bst_delete(g_tunnel.channels, node->key);
pthread_mutex_unlock(&g_tunnel.lock);
}
msg.header.type = CHANNEL_OK;
msg.header.size = 0;
if(msg_write(g_tunnel.hotline, &msg) == -1)
{
ERROR("Unable to write message to hotline");
}
}
static void monitor_hotline(int fd)
{
char buff[MAX_CHANNEL_NAME+1];
antd_tunnel_msg_t msg;
if(msg_read(fd, &msg) == -1)
{
ERROR("Unable to read message from hotline");
return;
}
switch (msg.header.type)
{
case CHANNEL_OPEN:
case CHANNEL_CLOSE:
// get channel name
if(msg.header.size > MAX_CHANNEL_NAME)
{
if(msg.data)
free(msg.data);
msg.header.type = CHANNEL_ERROR;
(void) snprintf(buff, MAX_CHANNEL_NAME, "Channel name exceeds %d bytes", MAX_CHANNEL_NAME);
LOG("%s", buff);
msg.header.size = strlen(buff);
msg.data = buff;
if(msg_write(fd, &msg) == -1)
{
ERROR("Unable to write error to hotline");
}
}
else
{
(void)memcpy(buff, msg.data, msg.header.size);
buff[msg.header.size] = '\0';
if(msg.header.type == CHANNEL_OPEN)
{
channel_open(fd, buff);
}
else
{
channel_close(fd, buff);
}
}
break;
default:
msg.header.type = CHANNEL_ERROR;
(void) snprintf(buff, MAX_CHANNEL_NAME, "Unsupported msg type %d in hotline", (int)msg.header.type);
msg.header.size = strlen(buff);
msg.data = buff;
LOG("%s", buff);
if(msg_write(fd, &msg) == -1)
{
ERROR("Unable to write error to hotline");
}
break;
}
}
static void write_msg_to_client(antd_tunnel_msg_t* msg, antd_client_t* client)
{
uint8_t* buffer;
int long_value = 0;
int offset = 0;
long_value = msg->header.size +
sizeof((int)MSG_MAGIC_BEGIN) +
sizeof(msg->header.type) +
sizeof(msg->header.channel_id) +
sizeof(msg->header.client_id) +
sizeof(msg->header.size) +
msg->header.size +
sizeof((int)MSG_MAGIC_END);
buffer = (uint8_t*) malloc(long_value);
if(buffer == NULL)
{
ERROR("unable to allocate memory for write");
return;
}
// magic
long_value = (int) MSG_MAGIC_BEGIN;
(void)memcpy(buffer,&long_value,sizeof(long_value));
offset += sizeof(long_value);
// type
(void)memcpy(buffer+offset,&msg->header.type,sizeof(msg->header.type));
offset += sizeof(msg->header.type);
// channel id
(void)memcpy(buffer+offset,&msg->header.channel_id,sizeof(msg->header.channel_id));
offset += sizeof(msg->header.channel_id);
// client id
(void)memcpy(buffer+offset,&msg->header.client_id,sizeof(msg->header.client_id));
offset += sizeof(msg->header.client_id);
// payload length
(void)memcpy(buffer+offset,&msg->header.size,sizeof(msg->header.size));
offset += sizeof(msg->header.size);
// payload
(void)memcpy(buffer+offset,&msg->data,sizeof(msg->header.size));
offset += msg->header.size;
// magic end
long_value = (int) MSG_MAGIC_END;
(void)memcpy(buffer,&long_value,sizeof(long_value));
offset += sizeof(long_value);
// write it to the websocket
ws_b(client,buffer, offset);
free(buffer);
}
static void handle_channel(bst_node_t* node, void** args, int argc)
{
antd_tunnel_msg_t msg;
(void) argc;
fd_set* fd_in = (fd_set*) args[0];
antd_tunnel_channel_t* channel = (antd_tunnel_channel_t*) node->data;
bst_node_t * client;
antd_client_t* rq;
if(channel->sock != -1 && FD_ISSET(channel->sock, fd_in))
{
// handle msg read
if(msg_read(channel->sock, &msg) == -1)
{
ERROR("Unable to read message from hotline");
return;
}
switch (msg.header.type)
{
case CHANNEL_OK:
case CHANNEL_ERROR:
case CHANNEL_DATA:
// forward message to the correct client in the channel
client = bst_find(channel->subscribers, msg.header.client_id);
if(client != NULL)
{
rq = (antd_client_t*) client->data;
if(rq != NULL)
{
write_msg_to_client(&msg, rq);
}
}
else
{
ERROR("Unable to find client %d to write on channel %s", msg.header.client_id, channel->name);
}
break;
default:
LOG("Message type %d is not supported in client-application communication", msg.header.type);
break;
}
}
}
static void set_sock_fd(bst_node_t* node, void** args, int argc)
{
(void) argc;
fd_set* fd_in = (fd_set*) args[0];
int* max_fd = args[1];
antd_tunnel_channel_t* channel = (antd_tunnel_channel_t*) node->data;
if(channel->sock != -1)
{
FD_SET(channel->sock, fd_in);
if(*max_fd < channel->sock)
{
*max_fd = channel->sock;
}
}
}
static void multiplex(antd_tunnel_t* tunnel_p)
{
int max_fdm, status;
@ -213,25 +557,21 @@ static void multiplex(antd_tunnel_t* tunnel_p)
int status = 0;
struct timeval timeout;
int rc;
size_t i = 0;
chain_t it;
antd_tunnel_channel_t* channel;
void *args[2];
while(status == 0)
{
timeout.tv_sec = 0;
timeout.tv_usec = 500;
timeout.tv_usec = SELECT_TIMEOUT;
FD_ZERO(&fd_in);
FD_SET(tunnel_p->hotline, &fd_in);
max_fdm = tunnel_p->hotline;
pthread_mutex_lock(&tunnel_p->lock);
for_each_assoc(it,tunnel_p->channels)
{
channel = (antd_tunnel_channel_t*) it->value;
if(channel != NULL)
{
FD_SET(channel->sock, &fd_in);
max_fdm = channel->sock > max_fdm ? channel->sock : max_fdm;
}
}
args[0] = (void*) &fd_in;
args[1] = (void*) &max_fdm;
bst_for_each(tunnel_p->channels, set_sock_fd, args, 2);
pthread_mutex_unlock(&tunnel_p->lock);
rc = select(max_fdm + 1, &fd_in, NULL, NULL, &timeout);
switch (rc)
@ -251,91 +591,24 @@ static void multiplex(antd_tunnel_t* tunnel_p)
monitor_hotline(tunnel_p->hotline);
}
pthread_mutex_lock(&tunnel_p->lock);
for_each_assoc(it,tunnel_p->channels)
{
channel = (antd_tunnel_channel_t*) it->value;
if(channel != NULL)
{
if(FD_ISSET(channel->sock, &fd_in))
{
handle_channel(channel);
}
}
}
args[0] = (void*) &fd_in;
bst_for_each(tunnel_p->channels, handle_channel,args, 1);
pthread_mutex_unlock(&tunnel_p->lock);
}
}
}
static int mk_socket(const char* path, uint8_t client)
{
struct sockaddr_un address;
address.sun_family = AF_UNIX;
(void) strncpy(address.sun_path, path, sizeof(address.sun_path));
int fd = socket(AF_UNIX, SOCK_STREAM, 0);
if(fd == -1)
{
ERROR("Unable to create Unix domain socket: %s", strerror(errno));
return -1;
}
if(client) // client side socket
{
if (connect(fd, (struct sockaddr*)&address, sizeof(address)) == -1)
{
ERROR("Unable to connect to socket name: %s : %s", address.sun_path, strerror(errno));
return -1;
}
}
else // server side socket
{
if(bind(fd, (struct sockaddr*)(&address), sizeof(address)) == -1)
{
ERROR("Unable to bind name: %s to a socket: %s", address.sun_path, strerror(errno));
return -1;
}
// mark the socket as passive mode
if(listen(fd , 100) == -1)
{
ERROR("Unable to listen to socket: %d (%s): %s",fd, path , strerror(errno));
return -1;
}
}
LOG("Socket %s is created successfully", path);
return fd;
}
void init()
{
char path[MAX_CHANNEL_PATH];
// initialise the lock
(void) pthread_mutex_init(&g_tunnel.lock,NULL);
// initialise the channel
g_tunnel.channels = dict();
g_tunnel.hotline = -1;
// create the hotline socket
(void)snprintf(path, MAX_CHANNEL_PATH,"%s/%s/",__plugin__.tmpdir, SOCK_DIR_NAME);
g_tunnel.channels = NULL;
g_tunnel.id_allocator = 0;
if(!_exist(path))
{
LOG("Socket dir does not exist, create it: %s",path);
if(mkdir(path, 0700) == -1)
{
ERROR("Unable to create socket dir: %s =", strerror(errno));
destroy();
return -1;
}
}
// Append the name of the socket
if(strlen(path) + strlen(HOT_LINE_SOCKET) > MAX_CHANNEL_PATH)
{
ERROR("Socket file path exceeds the maximal size of: %d", BUFFLEN);
destroy();
return -1;
}
(void)strcat(path, HOT_LINE_SOCKET);
if((g_tunnel.hotline = mk_socket(path, 0) == -1))
if((g_tunnel.hotline = mk_socket(HOT_LINE_SOCKET, path) == -1))
{
ERROR("Unable to create hotline socket");
destroy();
@ -350,39 +623,243 @@ void init()
}
}
static void free_subscribers(bst_node_t* node, void** args, int argc)
{
(void) argc;
(void) args;
antd_tunnel_channel_t* channel = (antd_tunnel_channel_t*) node->data;
destroy_channel(channel);
}
void destroy()
{
char path[BUFFLEN];
pthread_mutex_lock(&g_tunnel.lock);
if(g_tunnel.tid != -1)
pthread_join(g_tunnel.tid, NULL);
pthread_mutex_destroy(&g_tunnel.lock);
bst_for_each(g_tunnel.channels, free_subscribers, NULL, 0);
if(g_tunnel.hotline != -1)
{
(void) close(g_tunnel.hotline);
(void) snprintf(path, BUFFLEN, "%s/%s/%s", __plugin__.tmpdir, SOCK_DIR_NAME, HOT_LINE_SOCKET);
(void) unlink(path);
}
if(g_tunnel.channels)
bst_free(g_tunnel.channels);
pthread_mutex_unlock(&g_tunnel.lock);
pthread_mutex_destroy(&g_tunnel.lock);
}
static void process_client_message(antd_tunnel_msg_t* msg, antd_client_t* client)
{
char buff[BUFFLEN+1];
bst_node_t* node;
antd_tunnel_channel_t* channel;
int hash_val;
// let send it to the correct channel
switch (msg->header.type)
{
/** TODO: free the channel list first */
freedict(g_tunnel.channels);
g_tunnel.channels = NULL;
case CHANNEL_OK:
case CHANNEL_ERROR:
case CHANNEL_DATA:
node = bst_find(g_tunnel.channels, msg->header.channel_id);
if(node)
{
channel = (antd_tunnel_channel_t*)node->data;
if(channel)
{
if(msg_write(channel->sock, &msg) == -1)
{
ERROR("Unable to write data to channel [%s] from client %d", channel->name, msg->header.client_id);
}
}
}
break;
case CHANNEL_SUBSCRIBE:
case CHANNEL_UNSUBSCRIBE:
if(msg->header.size > MAX_CHANNEL_NAME)
{
msg->header.type = CHANNEL_ERROR;
(void) snprintf(buff, BUFFLEN, "Channel name is too long. Max length is %d", MAX_CHANNEL_NAME);
msg->header.size = strlen(buff);
msg->data = buff;
ERROR("%s", buff);
write_msg_to_client(msg, client);
return;
}
(void)memcpy(buff, msg->data, msg->header.size);
buff[msg->header.size] = '\0';
hash_val = simple_hash(buff);
node = bst_find(g_tunnel.channels, hash_val);
if(node)
{
channel = (antd_tunnel_channel_t*)node->data;
if(channel)
{
if(msg->header.type == CHANNEL_SUBSCRIBE)
{
g_tunnel.id_allocator++;
channel->subscribers = bst_insert(channel->subscribers, g_tunnel.id_allocator, client);
// sent ok to client
msg->header.type = CHANNEL_OK;
msg->header.channel_id = hash_val;
msg->header.size = sizeof(g_tunnel.id_allocator);
(void)memcpy(buff, &g_tunnel.id_allocator, sizeof(g_tunnel.id_allocator));
write_msg_to_client(msg, client);
}
else
{
channel->subscribers = bst_delete(channel->subscribers, msg->header.client_id);
msg->header.type = CHANNEL_OK;
msg->header.channel_id = hash_val;
msg->header.size = 0;
write_msg_to_client(msg, client);
}
}
}
else
{
msg->header.type = CHANNEL_ERROR;
(void) snprintf(buff, BUFFLEN, "Channel not found");
msg->header.size = strlen(buff);
msg->data = buff;
ERROR("%s", buff);
write_msg_to_client(msg, client);
}
break;
default:
LOG("Unsupported message type for client msg %d", msg->header.type);
break;
}
}
void *handle(void *rqdata)
{
antd_request_t *rq = (antd_request_t *)rqdata;
antd_task_t *task = antd_create_task(NULL, (void *)rq, NULL, time(NULL));
task->priority++;
antd_task_t *task = antd_create_task(NULL, (void *)rq, NULL, time(NULL));
ws_msg_header_t *h = NULL;
antd_tunnel_msg_t msg;
struct timeval timeout;
uint8_t* buffer;
fd_set fd_in;
int rc, long_value, offset;
task->priority++;
int cl_fd = ((antd_client_t *)rq->client)->sock;
if(g_tunnel.tid == -1)
{
ERROR("The tunnel plugin is not initialised correctly");
return task;
}
if (ws_enable(rq->request))
{
{
timeout.tv_sec = 0;
timeout.tv_usec = 500;
FD_ZERO(&fd_in);
FD_SET(cl_fd, &fd_in);
rc = select(cl_fd + 1, &fd_in, NULL, NULL, &timeout);
switch (rc)
{
case -1:
LOG("Error on select(): %s\n", strerror(errno));
ws_close(rq->client, 1011);
/** TODO: remove all subscriber of this ws connection */
return task;
case 0:
// time out
break;
// we have data
default:
pthread_mutex_lock(&g_tunnel.lock);
h = ws_read_header(rq->client);
pthread_mutex_unlock(&g_tunnel.lock);
if (h)
{
if (h->mask == 0)
{
LOG("Data is not mask");
// kill the child process
free(h);
pthread_mutex_lock(&g_tunnel.lock);
ws_close(rq->client, 1011);
pthread_mutex_unlock(&g_tunnel.lock);
/** TODO: remove all subscriber of this ws connection */
return task;
}
if (h->opcode == WS_CLOSE)
{
LOG("Websocket: connection closed");
pthread_mutex_lock(&g_tunnel.lock);
ws_close(rq->client, 1011);
pthread_mutex_unlock(&g_tunnel.lock);
free(h);
/** TODO: remove all subscriber of this ws connection */
return task;
}
if (h->opcode == WS_BIN)
{
// we have data, now read the message,
// the message must be in bin
buffer = (uint8_t*) malloc(h->plen + 1);
if(buffer)
{
pthread_mutex_lock(&g_tunnel.lock);
rc = ws_read_data(rq->client,h, h->plen, buffer);
pthread_mutex_unlock(&g_tunnel.lock);
if(h->plen == 0)
{
offset = 0;
// verify begin magic
(void)memcpy(&long_value, buffer,sizeof(long_value));
offset += sizeof(long_value);
if(long_value != MSG_MAGIC_BEGIN)
{
ERROR("Invalid begin magic number: %d, expected %d", long_value, MSG_MAGIC_BEGIN);
free(buffer);
goto reschedule_task;
}
// msgtype
(void) memcpy(&msg.header.type, buffer + offset, sizeof(msg.header.type));
offset += sizeof(msg.header.type);
// channel id
(void) memcpy(&msg.header.channel_id, buffer + offset, sizeof(msg.header.channel_id));
offset += sizeof(msg.header.channel_id);
// client id
(void) memcpy(&msg.header.client_id, buffer + offset, sizeof(msg.header.client_id));
offset += sizeof(msg.header.client_id);
// data size
(void) memcpy(&msg.header.size, buffer + offset, sizeof(msg.header.size));
offset += sizeof(msg.header.size);
// data
msg.data = buffer + offset;
offset += msg.header.size;
// verify end magic
(void)memcpy(&long_value, buffer + offset ,sizeof(long_value));
offset += sizeof(long_value);
if(long_value != MSG_MAGIC_END)
{
ERROR("Invalid end magic number: %d, expected %d", long_value, MSG_MAGIC_END);
free(buffer);
goto reschedule_task;
}
// now we have the message
pthread_mutex_lock(&g_tunnel.lock);
process_client_message(&msg, rq->client);
pthread_mutex_unlock(&g_tunnel.lock);
}
free(buffer);
}
}
free(h);
}
}
reschedule_task:
task->handle = handle;
task->type = HEAVY;
task->access_time = time(NULL);
return task;
}