Previous implementation violated the RFC by having both the actual opcode and WS_FIN flag set for all fragments of a message. Fixed by setting the opcode only for the first fragment and WS_FIN for the last one Closes IDFGH-2938 Closes https://github.com/espressif/esp-idf/issues/4974
551 lines
18 KiB
C
551 lines
18 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <sys/random.h>
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#include "esp_log.h"
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#include "esp_transport.h"
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#include "esp_transport_tcp.h"
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#include "esp_transport_ws.h"
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#include "esp_transport_utils.h"
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#include "mbedtls/base64.h"
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#include "mbedtls/sha1.h"
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static const char *TAG = "TRANSPORT_WS";
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#define DEFAULT_WS_BUFFER (1024)
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#define WS_FIN 0x80
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#define WS_OPCODE_CONT 0x00
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#define WS_OPCODE_TEXT 0x01
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#define WS_OPCODE_BINARY 0x02
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#define WS_OPCODE_CLOSE 0x08
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#define WS_OPCODE_PING 0x09
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#define WS_OPCODE_PONG 0x0a
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// Second byte
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#define WS_MASK 0x80
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#define WS_SIZE16 126
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#define WS_SIZE64 127
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#define MAX_WEBSOCKET_HEADER_SIZE 16
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#define WS_RESPONSE_OK 101
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typedef struct {
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uint8_t opcode;
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char mask_key[4]; /*!< Mask key for this payload */
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int payload_len; /*!< Total length of the payload */
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int bytes_remaining; /*!< Bytes left to read of the payload */
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} ws_transport_frame_state_t;
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typedef struct {
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char *path;
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char *buffer;
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char *sub_protocol;
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char *user_agent;
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char *headers;
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ws_transport_frame_state_t frame_state;
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esp_transport_handle_t parent;
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} transport_ws_t;
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static inline uint8_t ws_get_bin_opcode(ws_transport_opcodes_t opcode)
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{
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return (uint8_t)opcode;
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}
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static esp_transport_handle_t ws_get_payload_transport_handle(esp_transport_handle_t t)
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{
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transport_ws_t *ws = esp_transport_get_context_data(t);
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/* Reading parts of a frame directly will disrupt the WS internal frame state,
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reset bytes_remaining to prepare for reading a new frame */
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ws->frame_state.bytes_remaining = 0;
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return ws->parent;
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}
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static char *trimwhitespace(const char *str)
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{
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char *end;
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// Trim leading space
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while (isspace((unsigned char)*str)) str++;
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if (*str == 0) {
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return (char *)str;
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}
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// Trim trailing space
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end = (char *)(str + strlen(str) - 1);
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while (end > str && isspace((unsigned char)*end)) end--;
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// Write new null terminator
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*(end + 1) = 0;
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return (char *)str;
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}
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static char *get_http_header(const char *buffer, const char *key)
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{
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char *found = strcasestr(buffer, key);
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if (found) {
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found += strlen(key);
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char *found_end = strstr(found, "\r\n");
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if (found_end) {
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found_end[0] = 0;//terminal string
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return trimwhitespace(found);
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}
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}
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return NULL;
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}
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static int ws_connect(esp_transport_handle_t t, const char *host, int port, int timeout_ms)
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{
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transport_ws_t *ws = esp_transport_get_context_data(t);
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if (esp_transport_connect(ws->parent, host, port, timeout_ms) < 0) {
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ESP_LOGE(TAG, "Error connecting to host %s:%d", host, port);
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return -1;
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}
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unsigned char random_key[16];
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getrandom(random_key, sizeof(random_key), 0);
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// Size of base64 coded string is equal '((input_size * 4) / 3) + (input_size / 96) + 6' including Z-term
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unsigned char client_key[28] = {0};
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const char *user_agent_ptr = (ws->user_agent)?(ws->user_agent):"ESP32 Websocket Client";
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size_t outlen = 0;
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mbedtls_base64_encode(client_key, sizeof(client_key), &outlen, random_key, sizeof(random_key));
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int len = snprintf(ws->buffer, DEFAULT_WS_BUFFER,
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"GET %s HTTP/1.1\r\n"
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"Connection: Upgrade\r\n"
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"Host: %s:%d\r\n"
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"User-Agent: %s\r\n"
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"Upgrade: websocket\r\n"
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"Sec-WebSocket-Version: 13\r\n"
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"Sec-WebSocket-Key: %s\r\n",
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ws->path,
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host, port, user_agent_ptr,
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client_key);
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if (len <= 0 || len >= DEFAULT_WS_BUFFER) {
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ESP_LOGE(TAG, "Error in request generation, %d", len);
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return -1;
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}
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if (ws->sub_protocol) {
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ESP_LOGD(TAG, "sub_protocol: %s", ws->sub_protocol);
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int r = snprintf(ws->buffer + len, DEFAULT_WS_BUFFER - len, "Sec-WebSocket-Protocol: %s\r\n", ws->sub_protocol);
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len += r;
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if (r <= 0 || len >= DEFAULT_WS_BUFFER) {
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ESP_LOGE(TAG, "Error in request generation"
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"(snprintf of subprotocol returned %d, desired request len: %d, buffer size: %d", r, len, DEFAULT_WS_BUFFER);
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return -1;
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}
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}
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if (ws->headers) {
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ESP_LOGD(TAG, "headers: %s", ws->headers);
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int r = snprintf(ws->buffer + len, DEFAULT_WS_BUFFER - len, "%s", ws->headers);
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len += r;
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if (r <= 0 || len >= DEFAULT_WS_BUFFER) {
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ESP_LOGE(TAG, "Error in request generation"
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"(strncpy of headers returned %d, desired request len: %d, buffer size: %d", r, len, DEFAULT_WS_BUFFER);
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return -1;
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}
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}
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int r = snprintf(ws->buffer + len, DEFAULT_WS_BUFFER - len, "\r\n");
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len += r;
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if (r <= 0 || len >= DEFAULT_WS_BUFFER) {
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ESP_LOGE(TAG, "Error in request generation"
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"(snprintf of header terminal returned %d, desired request len: %d, buffer size: %d", r, len, DEFAULT_WS_BUFFER);
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return -1;
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}
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ESP_LOGD(TAG, "Write upgrate request\r\n%s", ws->buffer);
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if (esp_transport_write(ws->parent, ws->buffer, len, timeout_ms) <= 0) {
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ESP_LOGE(TAG, "Error write Upgrade header %s", ws->buffer);
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return -1;
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}
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int header_len = 0;
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do {
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if ((len = esp_transport_read(ws->parent, ws->buffer + header_len, DEFAULT_WS_BUFFER - header_len, timeout_ms)) <= 0) {
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ESP_LOGE(TAG, "Error read response for Upgrade header %s", ws->buffer);
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return -1;
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}
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header_len += len;
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ws->buffer[header_len] = '\0';
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ESP_LOGD(TAG, "Read header chunk %d, current header size: %d", len, header_len);
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} while (NULL == strstr(ws->buffer, "\r\n\r\n") && header_len < DEFAULT_WS_BUFFER);
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char *server_key = get_http_header(ws->buffer, "Sec-WebSocket-Accept:");
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if (server_key == NULL) {
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ESP_LOGE(TAG, "Sec-WebSocket-Accept not found");
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return -1;
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}
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// See mbedtls_sha1_ret() arg size
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unsigned char expected_server_sha1[20];
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// Size of base64 coded string see above
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unsigned char expected_server_key[33] = {0};
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// If you are interested, see https://tools.ietf.org/html/rfc6455
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const char expected_server_magic[] = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
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unsigned char expected_server_text[sizeof(client_key) + sizeof(expected_server_magic) + 1];
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strcpy((char*)expected_server_text, (char*)client_key);
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strcat((char*)expected_server_text, expected_server_magic);
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size_t key_len = strlen((char*)expected_server_text);
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mbedtls_sha1_ret(expected_server_text, key_len, expected_server_sha1);
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mbedtls_base64_encode(expected_server_key, sizeof(expected_server_key), &outlen, expected_server_sha1, sizeof(expected_server_sha1));
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expected_server_key[ (outlen < sizeof(expected_server_key)) ? outlen : (sizeof(expected_server_key) - 1) ] = 0;
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ESP_LOGD(TAG, "server key=%s, send_key=%s, expected_server_key=%s", (char *)server_key, (char*)client_key, expected_server_key);
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if (strcmp((char*)expected_server_key, (char*)server_key) != 0) {
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ESP_LOGE(TAG, "Invalid websocket key");
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return -1;
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}
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return 0;
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}
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static int _ws_write(esp_transport_handle_t t, int opcode, int mask_flag, const char *b, int len, int timeout_ms)
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{
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transport_ws_t *ws = esp_transport_get_context_data(t);
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char *buffer = (char *)b;
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char ws_header[MAX_WEBSOCKET_HEADER_SIZE];
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char *mask;
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int header_len = 0, i;
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int poll_write;
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if ((poll_write = esp_transport_poll_write(ws->parent, timeout_ms)) <= 0) {
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ESP_LOGE(TAG, "Error transport_poll_write");
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return poll_write;
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}
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ws_header[header_len++] = opcode;
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if (len <= 125) {
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ws_header[header_len++] = (uint8_t)(len | mask_flag);
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} else if (len < 65536) {
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ws_header[header_len++] = WS_SIZE16 | mask_flag;
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ws_header[header_len++] = (uint8_t)(len >> 8);
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ws_header[header_len++] = (uint8_t)(len & 0xFF);
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} else {
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ws_header[header_len++] = WS_SIZE64 | mask_flag;
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/* Support maximum 4 bytes length */
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ws_header[header_len++] = 0; //(uint8_t)((len >> 56) & 0xFF);
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ws_header[header_len++] = 0; //(uint8_t)((len >> 48) & 0xFF);
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ws_header[header_len++] = 0; //(uint8_t)((len >> 40) & 0xFF);
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ws_header[header_len++] = 0; //(uint8_t)((len >> 32) & 0xFF);
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ws_header[header_len++] = (uint8_t)((len >> 24) & 0xFF);
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ws_header[header_len++] = (uint8_t)((len >> 16) & 0xFF);
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ws_header[header_len++] = (uint8_t)((len >> 8) & 0xFF);
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ws_header[header_len++] = (uint8_t)((len >> 0) & 0xFF);
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}
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if (mask_flag) {
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mask = &ws_header[header_len];
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getrandom(ws_header + header_len, 4, 0);
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header_len += 4;
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for (i = 0; i < len; ++i) {
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buffer[i] = (buffer[i] ^ mask[i % 4]);
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}
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}
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if (esp_transport_write(ws->parent, ws_header, header_len, timeout_ms) != header_len) {
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ESP_LOGE(TAG, "Error write header");
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return -1;
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}
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if (len == 0) {
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return 0;
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}
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int ret = esp_transport_write(ws->parent, buffer, len, timeout_ms);
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// in case of masked transport we have to revert back to the original data, as ws layer
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// does not create its own copy of data to be sent
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if (mask_flag) {
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mask = &ws_header[header_len-4];
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for (i = 0; i < len; ++i) {
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buffer[i] = (buffer[i] ^ mask[i % 4]);
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}
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}
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return ret;
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}
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int esp_transport_ws_send_raw(esp_transport_handle_t t, ws_transport_opcodes_t opcode, const char *b, int len, int timeout_ms)
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{
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uint8_t op_code = ws_get_bin_opcode(opcode);
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if (t == NULL) {
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ESP_LOGE(TAG, "Transport must be a valid ws handle");
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return ESP_ERR_INVALID_ARG;
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}
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ESP_LOGD(TAG, "Sending raw ws message with opcode %d", op_code);
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return _ws_write(t, op_code, WS_MASK, b, len, timeout_ms);
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}
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static int ws_write(esp_transport_handle_t t, const char *b, int len, int timeout_ms)
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{
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if (len == 0) {
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// Default transport write of zero length in ws layer sends out a ping message.
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// This behaviour could however be altered in IDF 5.0, since a separate API for sending
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// messages with user defined opcodes has been introduced.
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ESP_LOGD(TAG, "Write PING message");
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return _ws_write(t, WS_OPCODE_PING | WS_FIN, WS_MASK, NULL, 0, timeout_ms);
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}
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return _ws_write(t, WS_OPCODE_BINARY | WS_FIN, WS_MASK, b, len, timeout_ms);
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}
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static int ws_read_payload(esp_transport_handle_t t, char *buffer, int len, int timeout_ms)
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{
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transport_ws_t *ws = esp_transport_get_context_data(t);
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int bytes_to_read;
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int rlen = 0;
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if (ws->frame_state.bytes_remaining > len) {
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ESP_LOGD(TAG, "Actual data to receive (%d) are longer than ws buffer (%d)", ws->frame_state.bytes_remaining, len);
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bytes_to_read = len;
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} else {
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bytes_to_read = ws->frame_state.bytes_remaining;
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}
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// Receive and process payload
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if (bytes_to_read != 0 && (rlen = esp_transport_read(ws->parent, buffer, bytes_to_read, timeout_ms)) <= 0) {
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ESP_LOGE(TAG, "Error read data");
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return rlen;
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}
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ws->frame_state.bytes_remaining -= rlen;
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if (ws->frame_state.mask_key) {
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for (int i = 0; i < bytes_to_read; i++) {
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buffer[i] = (buffer[i] ^ ws->frame_state.mask_key[i % 4]);
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}
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}
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return rlen;
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}
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/* Read and parse the WS header, determine length of payload */
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static int ws_read_header(esp_transport_handle_t t, char *buffer, int len, int timeout_ms)
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{
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transport_ws_t *ws = esp_transport_get_context_data(t);
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int payload_len;
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char ws_header[MAX_WEBSOCKET_HEADER_SIZE];
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char *data_ptr = ws_header, mask;
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int rlen;
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int poll_read;
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if ((poll_read = esp_transport_poll_read(ws->parent, timeout_ms)) <= 0) {
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return poll_read;
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}
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// Receive and process header first (based on header size)
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int header = 2;
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int mask_len = 4;
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if ((rlen = esp_transport_read(ws->parent, data_ptr, header, timeout_ms)) <= 0) {
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ESP_LOGE(TAG, "Error read data");
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return rlen;
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}
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ws->frame_state.opcode = (*data_ptr & 0x0F);
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data_ptr ++;
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mask = ((*data_ptr >> 7) & 0x01);
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payload_len = (*data_ptr & 0x7F);
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data_ptr++;
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ESP_LOGD(TAG, "Opcode: %d, mask: %d, len: %d\r\n", ws->frame_state.opcode, mask, payload_len);
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if (payload_len == 126) {
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// headerLen += 2;
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if ((rlen = esp_transport_read(ws->parent, data_ptr, header, timeout_ms)) <= 0) {
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ESP_LOGE(TAG, "Error read data");
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return rlen;
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}
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payload_len = data_ptr[0] << 8 | data_ptr[1];
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} else if (payload_len == 127) {
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// headerLen += 8;
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header = 8;
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if ((rlen = esp_transport_read(ws->parent, data_ptr, header, timeout_ms)) <= 0) {
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ESP_LOGE(TAG, "Error read data");
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return rlen;
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}
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if (data_ptr[0] != 0 || data_ptr[1] != 0 || data_ptr[2] != 0 || data_ptr[3] != 0) {
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// really too big!
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payload_len = 0xFFFFFFFF;
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} else {
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payload_len = data_ptr[4] << 24 | data_ptr[5] << 16 | data_ptr[6] << 8 | data_ptr[7];
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}
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}
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if (mask) {
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// Read and store mask
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if (payload_len != 0 && (rlen = esp_transport_read(ws->parent, buffer, mask_len, timeout_ms)) <= 0) {
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ESP_LOGE(TAG, "Error read data");
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return rlen;
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}
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memcpy(ws->frame_state.mask_key, buffer, mask_len);
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} else {
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memset(ws->frame_state.mask_key, 0, mask_len);
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}
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ws->frame_state.payload_len = payload_len;
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ws->frame_state.bytes_remaining = payload_len;
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return payload_len;
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}
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static int ws_read(esp_transport_handle_t t, char *buffer, int len, int timeout_ms)
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{
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int rlen = 0;
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transport_ws_t *ws = esp_transport_get_context_data(t);
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// If message exceeds buffer len then subsequent reads will skip reading header and read whatever is left of the payload
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if (ws->frame_state.bytes_remaining <= 0) {
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if ( (rlen = ws_read_header(t, buffer, len, timeout_ms)) <= 0) {
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// If something when wrong then we prepare for reading a new header
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ws->frame_state.bytes_remaining = 0;
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return rlen;
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}
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}
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if (ws->frame_state.payload_len) {
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if ( (rlen = ws_read_payload(t, buffer, len, timeout_ms)) <= 0) {
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ESP_LOGE(TAG, "Error reading payload data");
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ws->frame_state.bytes_remaining = 0;
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return rlen;
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}
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}
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return rlen;
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}
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static int ws_poll_read(esp_transport_handle_t t, int timeout_ms)
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{
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transport_ws_t *ws = esp_transport_get_context_data(t);
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return esp_transport_poll_read(ws->parent, timeout_ms);
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}
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static int ws_poll_write(esp_transport_handle_t t, int timeout_ms)
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{
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transport_ws_t *ws = esp_transport_get_context_data(t);
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return esp_transport_poll_write(ws->parent, timeout_ms);;
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}
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static int ws_close(esp_transport_handle_t t)
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{
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transport_ws_t *ws = esp_transport_get_context_data(t);
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return esp_transport_close(ws->parent);
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}
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static esp_err_t ws_destroy(esp_transport_handle_t t)
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{
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transport_ws_t *ws = esp_transport_get_context_data(t);
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free(ws->buffer);
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free(ws->path);
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free(ws->sub_protocol);
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free(ws->user_agent);
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free(ws->headers);
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free(ws);
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return 0;
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}
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void esp_transport_ws_set_path(esp_transport_handle_t t, const char *path)
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{
|
|
transport_ws_t *ws = esp_transport_get_context_data(t);
|
|
ws->path = realloc(ws->path, strlen(path) + 1);
|
|
strcpy(ws->path, path);
|
|
}
|
|
|
|
esp_transport_handle_t esp_transport_ws_init(esp_transport_handle_t parent_handle)
|
|
{
|
|
esp_transport_handle_t t = esp_transport_init();
|
|
transport_ws_t *ws = calloc(1, sizeof(transport_ws_t));
|
|
ESP_TRANSPORT_MEM_CHECK(TAG, ws, return NULL);
|
|
ws->parent = parent_handle;
|
|
|
|
ws->path = strdup("/");
|
|
ESP_TRANSPORT_MEM_CHECK(TAG, ws->path, {
|
|
free(ws);
|
|
return NULL;
|
|
});
|
|
ws->buffer = malloc(DEFAULT_WS_BUFFER);
|
|
ESP_TRANSPORT_MEM_CHECK(TAG, ws->buffer, {
|
|
free(ws->path);
|
|
free(ws);
|
|
return NULL;
|
|
});
|
|
|
|
esp_transport_set_func(t, ws_connect, ws_read, ws_write, ws_close, ws_poll_read, ws_poll_write, ws_destroy);
|
|
// webocket underlying transfer is the payload transfer handle
|
|
esp_transport_set_parent_transport_func(t, ws_get_payload_transport_handle);
|
|
|
|
esp_transport_set_context_data(t, ws);
|
|
return t;
|
|
}
|
|
|
|
esp_err_t esp_transport_ws_set_subprotocol(esp_transport_handle_t t, const char *sub_protocol)
|
|
{
|
|
if (t == NULL) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
transport_ws_t *ws = esp_transport_get_context_data(t);
|
|
if (ws->sub_protocol) {
|
|
free(ws->sub_protocol);
|
|
}
|
|
if (sub_protocol == NULL) {
|
|
ws->sub_protocol = NULL;
|
|
return ESP_OK;
|
|
}
|
|
ws->sub_protocol = strdup(sub_protocol);
|
|
if (ws->sub_protocol == NULL) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
esp_err_t esp_transport_ws_set_user_agent(esp_transport_handle_t t, const char *user_agent)
|
|
{
|
|
if (t == NULL) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
transport_ws_t *ws = esp_transport_get_context_data(t);
|
|
if (ws->user_agent) {
|
|
free(ws->user_agent);
|
|
}
|
|
if (user_agent == NULL) {
|
|
ws->user_agent = NULL;
|
|
return ESP_OK;
|
|
}
|
|
ws->user_agent = strdup(user_agent);
|
|
if (ws->user_agent == NULL) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
esp_err_t esp_transport_ws_set_headers(esp_transport_handle_t t, const char *headers)
|
|
{
|
|
if (t == NULL) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
transport_ws_t *ws = esp_transport_get_context_data(t);
|
|
if (ws->headers) {
|
|
free(ws->headers);
|
|
}
|
|
if (headers == NULL) {
|
|
ws->headers = NULL;
|
|
return ESP_OK;
|
|
}
|
|
ws->headers = strdup(headers);
|
|
if (ws->headers == NULL) {
|
|
return ESP_ERR_NO_MEM;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
ws_transport_opcodes_t esp_transport_ws_get_read_opcode(esp_transport_handle_t t)
|
|
{
|
|
transport_ws_t *ws = esp_transport_get_context_data(t);
|
|
return ws->frame_state.opcode;
|
|
}
|
|
|
|
int esp_transport_ws_get_read_payload_len(esp_transport_handle_t t)
|
|
{
|
|
transport_ws_t *ws = esp_transport_get_context_data(t);
|
|
return ws->frame_state.payload_len;
|
|
}
|
|
|
|
|