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support for custom websocket headers (#1573) 

Looks good to me. Thank you.

Also:
 - allow for '\0's in received messages

* add client:config for setting websocket headers

Also:
 - headers are case-insensitive now

* fix docs

* fix typo

* remove unnecessary luaL_argcheck calls

* replace os_sprintf with simple string copy
This commit is contained in:
Mariusz Kryński 2016-11-19 16:35:20 +01:00 committed by Philip Gladstone
parent 6331e0868c
commit 59b9b3e26f
4 changed files with 160 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
app/modules/websocket.c
View File

@ -15,6 +15,7 @@
#include "c_types.h"
#include "c_string.h"
#include "c_stdlib.h"
#include "websocketclient.h"
@ -45,7 +46,7 @@ static void websocketclient_onConnectionCallback(ws_info *ws) {
}
}
static void websocketclient_onReceiveCallback(ws_info *ws, char *message, int opCode) {
static void websocketclient_onReceiveCallback(ws_info *ws, int len, char *message, int opCode) {
NODE_DBG("websocketclient_onReceiveCallback\n");
lua_State *L = lua_getstate();
@ -59,7 +60,7 @@ static void websocketclient_onReceiveCallback(ws_info *ws, char *message, int op
if (data->onReceive != LUA_NOREF) {
lua_rawgeti(L, LUA_REGISTRYINDEX, data->onReceive); // load the callback function
lua_rawgeti(L, LUA_REGISTRYINDEX, data->self_ref); // pass itself, #1 callback argument
lua_pushstring(L, message); // #2 callback argument
lua_pushlstring(L, message, len); // #2 callback argument
lua_pushnumber(L, opCode); // #3 callback argument
lua_call(L, 3, 0);
}
@ -102,6 +103,7 @@ static int websocket_createClient(lua_State *L) {
ws_info *ws = (ws_info *) lua_newuserdata(L, sizeof(ws_info));
ws->connectionState = 0;
ws->extraHeaders = NULL;
ws->onConnection = &websocketclient_onConnectionCallback;
ws->onReceive = &websocketclient_onReceiveCallback;
ws->onFailure = &websocketclient_onCloseCallback;
@ -118,7 +120,6 @@ static int websocketclient_on(lua_State *L) {
NODE_DBG("websocketclient_on\n");
ws_info *ws = (ws_info *) luaL_checkudata(L, 1, METATABLE_WSCLIENT);
luaL_argcheck(L, ws, 1, "Client websocket expected");
ws_data *data = (ws_data *) ws->reservedData;
@ -170,7 +171,6 @@ static int websocketclient_connect(lua_State *L) {
NODE_DBG("websocketclient_connect is called.\n");
ws_info *ws = (ws_info *) luaL_checkudata(L, 1, METATABLE_WSCLIENT);
luaL_argcheck(L, ws, 1, "Client websocket expected");
ws_data *data = (ws_data *) ws->reservedData;
@ -188,11 +188,61 @@ static int websocketclient_connect(lua_State *L) {
return 0;
}
static header_t *realloc_headers(header_t *headers, int new_size) {
if(headers) {
for(header_t *header = headers; header->key; header++) {
c_free(header->value);
c_free(header->key);
}
c_free(headers);
}
if(!new_size)
return NULL;
return (header_t *)c_malloc(sizeof(header_t) * (new_size + 1));
}
static int websocketclient_config(lua_State *L) {
NODE_DBG("websocketclient_config is called.\n");
ws_info *ws = (ws_info *) luaL_checkudata(L, 1, METATABLE_WSCLIENT);
ws_data *data = (ws_data *) ws->reservedData;
luaL_checktype(L, 2, LUA_TTABLE);
lua_getfield(L, 2, "headers");
if(lua_istable(L, -1)) {
lua_pushnil(L);
int size = 0;
while(lua_next(L, -2)) {
size++;
lua_pop(L, 1);
}
ws->extraHeaders = realloc_headers(ws->extraHeaders, size);
if(ws->extraHeaders) {
header_t *header = ws->extraHeaders;
lua_pushnil(L);
while(lua_next(L, -2)) {
header->key = c_strdup(lua_tostring(L, -2));
header->value = c_strdup(lua_tostring(L, -1));
header++;
lua_pop(L, 1);
}
header->key = header->value = NULL;
}
}
lua_pop(L, 1); // pop headers
return 0;
}
static int websocketclient_send(lua_State *L) {
NODE_DBG("websocketclient_send is called.\n");
ws_info *ws = (ws_info *) luaL_checkudata(L, 1, METATABLE_WSCLIENT);
luaL_argcheck(L, ws, 1, "Client websocket expected");
ws_data *data = (ws_data *) ws->reservedData;
@ -225,7 +275,8 @@ static int websocketclient_gc(lua_State *L) {
NODE_DBG("websocketclient_gc\n");
ws_info *ws = (ws_info *) luaL_checkudata(L, 1, METATABLE_WSCLIENT);
luaL_argcheck(L, ws, 1, "Client websocket expected");
ws->extraHeaders = realloc_headers(ws->extraHeaders, 0);
ws_data *data = (ws_data *) ws->reservedData;
@ -265,6 +316,7 @@ static const LUA_REG_TYPE websocket_map[] =
static const LUA_REG_TYPE websocketclient_map[] =
{
{ LSTRKEY("on"), LFUNCVAL(websocketclient_on) },
{ LSTRKEY("config"), LFUNCVAL(websocketclient_config) },
{ LSTRKEY("connect"), LFUNCVAL(websocketclient_connect) },
{ LSTRKEY("send"), LFUNCVAL(websocketclient_send) },
{ LSTRKEY("close"), LFUNCVAL(websocketclient_close) },

92
app/websocket/websocketclient.c
View File

@ -47,18 +47,10 @@
#define PORT_INSECURE 80
#define PORT_MAX_VALUE 65535
// TODO: user agent configurable
#define WS_INIT_HEADERS "GET %s HTTP/1.1\r\n"\
"Host: %s:%d\r\n"\
"Upgrade: websocket\r\n"\
"Connection: Upgrade\r\n"\
"User-Agent: ESP8266\r\n"\
"Sec-Websocket-Key: %s\r\n"\
"Sec-WebSocket-Protocol: chat\r\n"\
"Sec-WebSocket-Version: 13\r\n"\
"\r\n"
#define WS_INIT_REQUEST "GET %s HTTP/1.1\r\n"\
"Host: %s:%d\r\n"
#define WS_INIT_HEADERS_LENGTH 169
#define WS_INIT_REQUEST_LENGTH 30
#define WS_GUID "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
#define WS_GUID_LENGTH 36
@ -77,6 +69,13 @@
#define WS_OPCODE_PING 0x9
#define WS_OPCODE_PONG 0xA
header_t DEFAULT_HEADERS[] = {
{"User-Agent", "ESP8266"},
{"Sec-WebSocket-Protocol", "chat"},
{0}
};
header_t *EMPTY_HEADERS = DEFAULT_HEADERS + sizeof(DEFAULT_HEADERS) / sizeof(header_t) - 1;
static char *cryptoSha1(char *data, unsigned int len) {
SHA1_CTX ctx;
SHA1Init(&ctx);
@ -128,6 +127,44 @@ static void generateSecKeys(char **key, char **expectedKey) {
os_free(keyEncrypted);
}
static char *_strcpy(char *dst, char *src) {
while(*dst++ = *src++);
return dst - 1;
}
static int headers_length(header_t *headers) {
int length = 0;
for(; headers->key; headers++)
length += strlen(headers->key) + strlen(headers->value) + 4;
return length;
}
static char *sprintf_headers(char *buf, ...) {
char *dst = buf;
va_list args;
va_start(args, buf);
for(header_t *header_set = va_arg(args, header_t *); header_set; header_set = va_arg(args, header_t *))
for(header_t *header = header_set; header->key; header++) {
va_list args2;
va_start(args2, buf);
for(header_t *header_set2 = va_arg(args2, header_t *); header_set2; header_set2 = va_arg(args2, header_t *))
for(header_t *header2 = header_set2; header2->key; header2++) {
if(header == header2)
goto ok;
if(!strcasecmp(header->key, header2->key))
goto skip;
}
ok:
dst = _strcpy(dst, header->key);
dst = _strcpy(dst, ": ");
dst = _strcpy(dst, header->value);
dst = _strcpy(dst, "\r\n");
skip:;
}
dst = _strcpy(dst, "\r\n");
return dst;
}
static void ws_closeSentCallback(void *arg) {
NODE_DBG("ws_closeSentCallback \n");
struct espconn *conn = (struct espconn *) arg;
@ -452,7 +489,7 @@ static void ws_receiveCallback(void *arg, char *buf, unsigned short len) {
} else if (opCode == WS_OPCODE_PONG) {
// ping alarm was already reset...
} else {
if (ws->onReceive) ws->onReceive(ws, payload, opCode);
if (ws->onReceive) ws->onReceive(ws, payloadLength, payload, opCode);
}
os_free(payload);
}
@ -509,7 +546,7 @@ static void ws_initReceiveCallback(void *arg, char *buf, unsigned short len) {
}
// Check server has valid sec key
if (strstr(buf, WS_HTTP_SEC_WEBSOCKET_ACCEPT) == NULL || strstr(buf, ws->expectedSecKey) == NULL) {
if (strstr(buf, ws->expectedSecKey) == NULL) {
NODE_DBG("Server has invalid response\n");
ws->knownFailureCode = -7;
if (ws->isSecure)
@ -550,12 +587,31 @@ static void connect_callback(void *arg) {
char *key;
generateSecKeys(&key, &ws->expectedSecKey);
char buf[WS_INIT_HEADERS_LENGTH + strlen(ws->path) + strlen(ws->hostname) + strlen(key)];
int len = os_sprintf(buf, WS_INIT_HEADERS, ws->path, ws->hostname, ws->port, key);
header_t headers[] = {
{"Upgrade", "websocket"},
{"Connection", "Upgrade"},
{"Sec-WebSocket-Key", key},
{"Sec-WebSocket-Version", "13"},
{0}
};
header_t *extraHeaders = ws->extraHeaders ? ws->extraHeaders : EMPTY_HEADERS;
char buf[WS_INIT_REQUEST_LENGTH + strlen(ws->path) + strlen(ws->hostname) +
headers_length(DEFAULT_HEADERS) + headers_length(headers) + headers_length(extraHeaders) + 2];
int len = os_sprintf(
buf,
WS_INIT_REQUEST,
ws->path,
ws->hostname,
ws->port
);
len = sprintf_headers(buf + len, headers, extraHeaders, DEFAULT_HEADERS, 0) - buf;
os_free(key);
NODE_DBG("connecting\n");
NODE_DBG("request: %s", buf);
if (ws->isSecure)
espconn_secure_send(conn, (uint8_t *) buf, len);
else
@ -630,7 +686,7 @@ static void dns_callback(const char *hostname, ip_addr_t *addr, void *arg) {
ws_info *ws = (ws_info *) conn->reverse;
if (ws->conn == NULL || ws->connectionState == 4) {
return;
return;
}
if (addr == NULL) {

8
app/websocket/websocketclient.h
View File

@ -40,9 +40,14 @@
struct ws_info;
typedef void (*ws_onConnectionCallback)(struct ws_info *wsInfo);
typedef void (*ws_onReceiveCallback)(struct ws_info *wsInfo, char *message, int opCode);
typedef void (*ws_onReceiveCallback)(struct ws_info *wsInfo, int len, char *message, int opCode);
typedef void (*ws_onFailureCallback)(struct ws_info *wsInfo, int errorCode);
typedef struct {
char *key;
char *value;
} header_t;
typedef struct ws_info {
int connectionState;
@ -51,6 +56,7 @@ typedef struct ws_info {
int port;
char *path;
char *expectedSecKey;
header_t *extraHeaders;
struct espconn *conn;
void *reservedData;

25
docs/en/modules/websocket.md
View File

@ -7,10 +7,6 @@ A websocket *client* module that implements [RFC6455](https://tools.ietf.org/htm
The implementation supports fragmented messages, automatically respondes to ping requests and periodically pings if the server isn't communicating.
!!! note
Currently, it is **not** possible to change the request headers, most notably the user agent.
**SSL/TLS support**
Take note of constraints documented in the [net module](net.md).
@ -70,6 +66,27 @@ ws = nil -- fully dispose the client as lua will now gc it
```
## websocket.client:config(params)
Configures websocket client instance.
#### Syntax
`websocket:config(params)`
#### Parameters
- `params` table with configuration parameters. Following keys are recognized:
- `headers` table of extra request headers affecting every request
#### Returns
`nil`
#### Example
```lua
ws = websocket.createClient()
ws:config({headers={['User-Agent']='NodeMCU'}})
```
## websocket.client:connect()
Attempts to estabilish a websocket connection to the given URL.