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Final?

This commit is contained in:
Casey 2024-01-08 16:11:18 +03:00
parent 9ec3039265
commit 7d1343a0d7
Signed by: hkc
GPG Key ID: F0F6CFE11CDB0960
2 changed files with 90 additions and 15 deletions
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90
wsvpn.c
View File

@ -10,6 +10,52 @@
#define MAX_OPEN_CHANNELS 128
#define MAX_PACKET_SIZE 32767
/*
```c
// ALL integers are network-endian
struct msg_info { // side: both. safe to ignore
uint8_t code; // 0x49, 'I'
uint16_t len;
char msg[1024]; // $.len bytes sent
};
struct msg_res_error {
uint8_t code; // 0x45, 'E'
uint16_t req_id; // request ID that caused that error
uint16_t len;
char msg[1024]; // $.len bytes sent
};
struct msg_address { // side: server
uint8_t code; // 0x41, 'A'
uint8_t size;
char name[256]; // $.size long
};
struct msg_res_success { // side: server
uint8_t code; // 0x52, 'R'
uint16_t req_id; // request ID we're replying to
void *data; // packet-specific
};
struct msg_transmission { // side: server
uint8_t code; // 0x54, 'T'
uint16_t channel;
uint16_t replyChannel;
uint16_t size;
void *data;
};
struct msg_req_open { // side: client
uint8_t code; // 0x4f, 'O'
uint16_t req_id; // incremental request ID
uint16_t channel; // channel to be open
};
```
*/
struct client {
struct mg_connection *connection;
uint16_t open_channels[MAX_OPEN_CHANNELS];
@ -24,6 +70,7 @@ static void on_ws_connect(struct mg_connection *connection, struct mg_http_messa
static void on_ws_message(struct mg_connection *connection, struct mg_ws_message *message, void *data);
static void on_ws_disconnect(struct mg_connection *connection, void *data);
bool client_is_open(struct client *client, uint16_t channel);
static void modem_open(struct client *client, uint16_t request_id, uint16_t channel);
static void modem_isOpen(struct client *client, uint16_t request_id, uint16_t channel);
static void modem_close(struct client *client, uint16_t request_id, uint16_t channel);
@ -146,12 +193,14 @@ void ws_respond(struct mg_connection *connection, uint16_t request_id, void *dat
}
static void on_ws_connect(struct mg_connection *connection, struct mg_http_message *message, void *data) {
static char addr_str[256];
mg_snprintf(addr_str, 256, "%M", mg_print_ip_port, &connection->rem);
ws_send_info(connection, "Hello, %s", addr_str);
struct client *client = malloc(sizeof(struct client));
memcpy(&connection->data[0], &client, sizeof(struct client *));
client->connection = connection;
static char buffer[256];
buffer[0] = 'A';
buffer[1] = snprintf(&buffer[2], 250, "wsvpn_%ld", connection->id);
mg_ws_send(connection, buffer, 2 + buffer[1], WEBSOCKET_OP_BINARY);
}
static void on_ws_message(struct mg_connection *connection, struct mg_ws_message *message, void *data) {
@ -171,7 +220,7 @@ static void on_ws_message(struct mg_connection *connection, struct mg_ws_message
uint16_t request_id = ntohs(*(uint16_t*)&message->data.ptr[1]);
switch (message->data.ptr[0]) {
case 'I': // info. We can safely ignore that channel
case 'I': // info. We can safely ignore that message
break;
case 'O': // open
{
@ -205,7 +254,7 @@ static void on_ws_message(struct mg_connection *connection, struct mg_ws_message
uint16_t channel = ntohs(*(uint16_t*)&message->data.ptr[3]);
uint16_t reply_channel = ntohs(*(uint16_t*)&message->data.ptr[5]);
uint16_t data_length = ntohs(*(uint16_t*)&message->data.ptr[7]);
modem_transmit(client, request_id, channel, reply_channel, data, data_length);
modem_transmit(client, request_id, channel, reply_channel, (void*)&message->data.ptr[9], data_length);
}
return;
default:
@ -240,13 +289,7 @@ static void modem_open(struct client *client, uint16_t request_id, uint16_t chan
}
static void modem_isOpen(struct client *client, uint16_t request_id, uint16_t channel) {
unsigned char is_open = 0;
for (int i = 0; i < client->next_open_channel_index; i++) {
if (client->open_channels[i] == channel) {
is_open = 42;
break;
}
}
unsigned char is_open = client_is_open(client, channel) ? 42 : 0;
ws_respond(client->connection, request_id, &is_open, 1);
}
@ -275,7 +318,7 @@ static void modem_transmit(struct client *client, uint16_t request_id, uint16_t
return;
}
buffer[0] = 'M';
buffer[0] = 'T';
buffer[1] = (channel >> 8) & 0xFF;
buffer[2] = channel & 0xFF;
buffer[3] = (reply_channel >> 8) & 0xFF;
@ -283,4 +326,25 @@ static void modem_transmit(struct client *client, uint16_t request_id, uint16_t
buffer[5] = (size >> 8) & 0xFF;
buffer[6] = size & 0xFF;
memcpy(&buffer[7], data, size);
for (struct mg_connection *conn = client->connection->mgr->conns; conn != NULL; conn = conn->next) {
if (conn->is_websocket) {
struct client *other_client = *(struct client **)&conn->data[0];
if (other_client->connection == conn && other_client->connection != client->connection) {
if (client_is_open(other_client, channel)) {
mg_ws_send(other_client->connection, buffer, size + 7, WEBSOCKET_OP_BINARY);
}
}
}
}
ws_respond(client->connection, request_id, NULL, 0);
}
bool client_is_open(struct client *client, uint16_t channel) {
for (int i = 0; i < client->next_open_channel_index; i++) {
if (client->open_channels[i] == channel) {
return true;
}
}
return false;
}

15
wsvpn.lua
View File

@ -38,11 +38,13 @@ local WSModem = {
local serialized = textutils.serializeJSON(data)
expect.range(#serialized, 0, 65535)
serialized = { serialized:byte(1, 65536) }
return self._request(0x54, {
self._request(0x54, {
bit.band(0xFF, bit.brshift(channel, 8)),
bit.band(0xFF, channel),
bit.band(0xFF, bit.brshift(replyChannel, 8)),
bit.band(0xFF, replyChannel),
bit.band(0xFF, bit.brshift(#serialized, 8)),
bit.band(0xFF, #serialized),
table.unpack(serialized, 1, #serialized)
})
end,
@ -58,6 +60,9 @@ local WSModem = {
local len, msg = self._read_u16ne(data)
msg = string.char(table.unpack(msg))
os.queueEvent("wsvpn:info", msg)
elseif opcode == 0x41 then -- Set address/side
local len = table.remove(data, 1)
self.side = string.char(table.unpack(data, 1, len))
elseif opcode == 0x45 then -- Error
local request_id, error_length
request_id, data = self._read_u16ne(data)
@ -67,6 +72,12 @@ local WSModem = {
elseif opcode == 0x52 then -- Response
local request_id, response = self._read_u16ne(data)
os.queueEvent("wsvpn:response", true, request_id, response)
elseif opcode == 0x54 then -- Transmission
local channel, replyChannel, dataSize, packet
channel, data = self._read_u16ne(data)
replyChannel, data = self._read_u16ne(data)
dataSize, packet = self._read_u16ne(data)
os.queueEvent("modem_message", self.side or "wsmodem_0", channel, replyChannel, textutils.unserializeJSON(string.char(table.unpack(data, 1, dataSize))), nil)
else
return false, string.format("Invalid opcode 0x%02x", opcode)
end
@ -134,7 +145,7 @@ local WSModem = {
return function(addr)
local ws = assert(http.websocket(addr))
local sock = setmetatable({ _socket = ws, _req_id = 0 }, { __index = WSModem })
local sock = setmetatable({ _socket = ws, _req_id = 0, side = "wsmodem_unknown" }, { __index = WSModem })
for name, method in pairs(WSModem) do
sock[name] = function(...) return method(sock, ...) end
end