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// SPDX-License-Identifier: GPL-3.0-or-later
#include "streaming.h"
#include "connlist.h"
#include "h2o_utils.h"
#include "streaming/common.h"
static int pending_write_reqs = 0;
#define H2O2STREAM_BUF_SIZE (1024 * 1024)
// h2o_stream_conn_t related functions
void h2o_stream_conn_t_init(h2o_stream_conn_t *conn)
{
memset(conn, 0, sizeof(*conn));
conn->rx = rbuf_create(H2O2STREAM_BUF_SIZE);
conn->tx = rbuf_create(H2O2STREAM_BUF_SIZE);
pthread_mutex_init(&conn->rx_buf_lock, NULL);
pthread_mutex_init(&conn->tx_buf_lock, NULL);
pthread_cond_init(&conn->rx_buf_cond, NULL);
// no need to check for NULL as rbuf_create uses mallocz internally
}
void h2o_stream_conn_t_destroy(h2o_stream_conn_t *conn)
{
rbuf_free(conn->rx);
rbuf_free(conn->tx);
freez(conn->url);
freez(conn->user_agent);
pthread_mutex_destroy(&conn->rx_buf_lock);
pthread_mutex_destroy(&conn->tx_buf_lock);
pthread_cond_destroy(&conn->rx_buf_cond);
}
// streaming upgrade related functions
int is_streaming_handshake(h2o_req_t *req)
{
/* method */
if (!h2o_memis(req->input.method.base, req->input.method.len, H2O_STRLIT("GET")))
return 1;
if (!h2o_memis(req->path_normalized.base, req->path_normalized.len, H2O_STRLIT(NETDATA_STREAM_URL))) {
return 1;
}
/* upgrade header */
if (req->upgrade.base == NULL || !h2o_lcstris(req->upgrade.base, req->upgrade.len, H2O_STRLIT(NETDATA_STREAM_PROTO_NAME)))
return 1;
// TODO consider adding some key in form of random number
// to prevent caching on route especially if TLS is not used
// e.g. client sends random number
// server replies with it xored
return 0;
}
static void stream_on_close(h2o_stream_conn_t *conn);
void stream_process(h2o_stream_conn_t *conn, int initial);
void stream_on_complete(void *user_data, h2o_socket_t *sock, size_t reqsize)
{
h2o_stream_conn_t *conn = user_data;
/* close the connection on error */
if (sock == NULL) {
stream_on_close(conn);
return;
}
conn->sock = sock;
sock->data = conn;
conn_list_insert(&conn_list, conn);
h2o_buffer_consume(&sock->input, reqsize);
stream_process(conn, 1);
}
// handling of active streams
static void stream_on_close(h2o_stream_conn_t *conn)
{
if (conn->sock != NULL)
h2o_socket_close(conn->sock);
conn_list_remove_conn(&conn_list, conn);
pthread_mutex_lock(&conn->rx_buf_lock);
conn->shutdown = 1;
pthread_cond_broadcast(&conn->rx_buf_cond);
pthread_mutex_unlock(&conn->rx_buf_lock);
h2o_stream_conn_t_destroy(conn);
freez(conn);
}
static void on_write_complete(h2o_socket_t *sock, const char *err)
{
h2o_stream_conn_t *conn = sock->data;
if (err != NULL) {
stream_on_close(conn);
error_report("Streaming connection error \"%s\"", err);
return;
}
pthread_mutex_lock(&conn->tx_buf_lock);
rbuf_bump_tail(conn->tx, conn->tx_buf.len);
conn->tx_buf.base = NULL;
conn->tx_buf.len = 0;
pthread_mutex_unlock(&conn->tx_buf_lock);
stream_process(conn, 0);
}
static void stream_on_recv(h2o_socket_t *sock, const char *err)
{
h2o_stream_conn_t *conn = sock->data;
if (err != NULL) {
stream_on_close(conn);
error_report("Streaming connection error \"%s\"", err);
return;
}
stream_process(conn, 0);
}
#define PARSE_DONE 1
#define PARSE_ERROR -1
#define GIMME_MORE_OF_DEM_SWEET_BYTEZ 0
#define STREAM_METHOD "STREAM "
#define USER_AGENT "User-Agent: "
#define NEED_MIN_BYTES(buf, bytes) \
if (rbuf_bytes_available(buf) < bytes) \
return GIMME_MORE_OF_DEM_SWEET_BYTEZ;
// TODO check in streaming code this is probably defined somewhere already
#define MAX_LEN_STREAM_HELLO (1024*2)
static int process_STREAM_X_HTTP_1_1(http_stream_parse_state_t *parser_state, rbuf_t buf, char **url, char **user_agent)
{
int idx;
switch(*parser_state) {
case HTTP_STREAM:
NEED_MIN_BYTES(buf, strlen(STREAM_METHOD));
if (rbuf_memcmp_n(buf, H2O_STRLIT(STREAM_METHOD))) {
error_report("Expected \"%s\"", STREAM_METHOD);
return PARSE_ERROR;
}
rbuf_bump_tail(buf, strlen(STREAM_METHOD));
*parser_state = HTTP_URL;
/* FALLTHROUGH */
case HTTP_URL:
if (!rbuf_find_bytes(buf, " ", 1, &idx)) {
if (rbuf_bytes_available(buf) >= MAX_LEN_STREAM_HELLO) {
error_report("The initial \"STREAM [URL]" HTTP_1_1 "\" over max of %d", MAX_LEN_STREAM_HELLO);
return PARSE_ERROR;
}
}
*url = mallocz(idx + 1);
rbuf_pop(buf, *url, idx);
(*url)[idx] = 0;
*parser_state = HTTP_PROTO;
/* FALLTHROUGH */
case HTTP_PROTO:
NEED_MIN_BYTES(buf, strlen(HTTP_1_1));
if (rbuf_memcmp_n(buf, H2O_STRLIT(HTTP_1_1))) {
error_report("Expected \"%s\"", HTTP_1_1);
return PARSE_ERROR;
}
rbuf_bump_tail(buf, strlen(HTTP_1_1));
*parser_state = HTTP_USER_AGENT_KEY;
/* FALLTHROUGH */
case HTTP_USER_AGENT_KEY:
// and OF COURSE EVERYTHING is passed in URL except
// for user agent which we need and is passed as HTTP header
// not worth writing a parser for this so we manually extract
// just the single header we need and skip everything else
if (!rbuf_find_bytes(buf, USER_AGENT, strlen(USER_AGENT), &idx)) {
if (rbuf_bytes_available(buf) >= (size_t)(rbuf_get_capacity(buf) * 0.9)) {
error_report("The initial \"STREAM [URL]" HTTP_1_1 "\" over max of %d", MAX_LEN_STREAM_HELLO);
return PARSE_ERROR;
}
return GIMME_MORE_OF_DEM_SWEET_BYTEZ;
}
rbuf_bump_tail(buf, idx + strlen(USER_AGENT));
*parser_state = HTTP_USER_AGENT_VALUE;
/* FALLTHROUGH */
case HTTP_USER_AGENT_VALUE:
if (!rbuf_find_bytes(buf, "\r\n", 2, &idx)) {
if (rbuf_bytes_available(buf) >= (size_t)(rbuf_get_capacity(buf) * 0.9)) {
error_report("The initial \"STREAM [URL]" HTTP_1_1 "\" over max of %d", MAX_LEN_STREAM_HELLO);
return PARSE_ERROR;
}
return GIMME_MORE_OF_DEM_SWEET_BYTEZ;
}
*user_agent = mallocz(idx + 1);
rbuf_pop(buf, *user_agent, idx);
(*user_agent)[idx] = 0;
*parser_state = HTTP_HDR;
/* FALLTHROUGH */
case HTTP_HDR:
if (!rbuf_find_bytes(buf, HTTP_HDR_END, strlen(HTTP_HDR_END), &idx)) {
if (rbuf_bytes_available(buf) >= (size_t)(rbuf_get_capacity(buf) * 0.9)) {
error_report("The initial \"STREAM [URL]" HTTP_1_1 "\" over max of %d", MAX_LEN_STREAM_HELLO);
return PARSE_ERROR;
}
return GIMME_MORE_OF_DEM_SWEET_BYTEZ;
}
rbuf_bump_tail(buf, idx + strlen(HTTP_HDR_END));
*parser_state = HTTP_DONE;
return PARSE_DONE;
case HTTP_DONE:
error_report("Parsing is done. No need to call again.");
return PARSE_DONE;
default:
error_report("Unknown parser state %d",<
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