LWS_VISIBLE LWS_EXTERN struct lws *
lws_adopt_socket_readbuf(struct lws_context *context, lws_sockfd_type accept_fd,
const char *readbuf, size_t len)
{
struct lws *wsi = lws_adopt_socket(context, accept_fd);
struct lws_context_per_thread *pt;
struct allocated_headers *ah;
struct lws_pollfd *pfd;
if (!wsi)
return NULL;
if (!readbuf)
return wsi;
if (len > sizeof(ah->rx)) {
lwsl_err("%s: rx in too big\n", __func__);
goto bail;
}
/*
* we can't process the initial read data until we can attach an ah.
*
* if one is available, get it and place the data in his ah rxbuf...
* wsi with ah that have pending rxbuf get auto-POLLIN service.
*
* no autoservice because we didn't get a chance to attach the
* readbuf data to wsi or ah yet, and we will do it next if we get
* the ah.
*/
if (!lws_header_table_attach(wsi, 0)) {
ah = wsi->u.hdr.ah;
memcpy(ah->rx, readbuf, len);
ah->rxpos = 0;
ah->rxlen = len;
lwsl_notice("%s: calling service on readbuf ah\n", __func__);
pt = &context->pt[(int)wsi->tsi];
/* unlike a normal connect, we have the headers already
* (or the first part of them anyway).
* libuv won't come back and service us without a network
* event, so we need to do the header service right here.
*/
pfd = &pt->fds[wsi->position_in_fds_table];
pfd->revents |= LWS_POLLIN;
lwsl_err("%s: calling service\n", __func__);
if (lws_service_fd_tsi(context, pfd, wsi->tsi))
/* service closed us */
return NULL;
return wsi;
}
lwsl_err("%s: deferring handling ah\n", __func__);
/*
* hum if no ah came, we are on the wait list and must defer
* dealing with this until the ah arrives.
*
* later successful lws_header_table_attach() will apply the
* below to the rx buffer (via lws_header_table_reset()).
*/
wsi->u.hdr.preamble_rx = lws_malloc(len);
memcpy(wsi->u.hdr.preamble_rx, readbuf, len);
wsi->u.hdr.preamble_rx_len = len;
return wsi;
bail:
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return NULL;
}
LWS_VISIBLE int
lws_server_socket_service(struct lws_context *context, struct lws *wsi,
struct lws_pollfd *pollfd)
{
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
lws_sockfd_type accept_fd = LWS_SOCK_INVALID;
struct allocated_headers *ah;
#if LWS_POSIX
struct sockaddr_in cli_addr;
socklen_t clilen;
#endif
int n, len;
switch (wsi->mode) {
case LWSCM_HTTP_SERVING:
case LWSCM_HTTP_SERVING_ACCEPTED:
case LWSCM_HTTP2_SERVING:
/* handle http headers coming in */
/* pending truncated sends have uber priority */
if (wsi->trunc_len) {
if (!(pollfd->revents & LWS_POLLOUT))
break;
if (lws_issue_raw(wsi, wsi->trunc_alloc +
wsi->trunc_offset,
wsi->trunc_len) < 0)
goto fail;
/*
* we can't afford to allow input processing to send
* something new, so spin around he event loop until
* he doesn't have any partials
*/
break;
}
/* any incoming data ready? */
if (!(pollfd->revents & pollfd->events & LWS_POLLIN))
goto try_pollout;
/* these states imply we MUST have an ah attached */
if (wsi->state == LWSS_HTTP ||
wsi->state == LWSS_HTTP_ISSUING_FILE ||
wsi->state == LWSS_HTTP_HEADERS) {
if (!wsi->u.hdr.ah)
/* no autoservice beacuse we will do it next */
if (lws_header_table_attach(wsi, 0))
goto try_pollout;
ah = wsi->u.hdr.ah;
lwsl_debug("%s: %p: rxpos:%d rxlen:%d\n", __func__, wsi,
ah->rxpos, ah->rxlen);
/* if nothing in ah rx buffer, get some fresh rx */
if (ah->rxpos == ah->rxlen) {
ah->rxlen = lws_ssl_capable_read(wsi, ah->rx,
sizeof(ah->rx));
ah->rxpos = 0;
lwsl_debug("%s: wsi %p, ah->rxlen = %d\r\n",
__func__, wsi, ah->rxlen);
switch (ah->rxlen) {
case 0:
lwsl_info("%s: read 0 len\n", __func__);
/* lwsl_info(" state=%d\n", wsi->state); */
// if (!wsi->hdr_parsing_completed)
// lws_header_table_detach(wsi);
/* fallthru */
case LWS_SSL_CAPABLE_ERROR:
goto fail;
case LWS_SSL_CAPABLE_MORE_SERVICE:
ah->rxlen = ah->rxpos = 0;
goto try_pollout;
}
}
assert(ah->rxpos != ah->rxlen && ah->rxlen);
/* just ignore incoming if waiting for close */
if (wsi->state != LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE) {
n = lws_read(wsi, ah->rx + ah->rxpos,
ah->rxlen - ah->rxpos);
if (n < 0) /* we closed wsi */
return 1;
if (wsi->u.hdr.ah) {
if ( wsi->u.hdr.ah->rxlen)
wsi->u.hdr.ah->rxpos += n;
if (wsi->u.hdr.ah->rxpos == wsi->u.hdr.ah->rxlen &&
(wsi->mode != LWSCM_HTTP_SERVING &&
wsi->mode != LWSCM_HTTP_SERVING_ACCEPTED &&
wsi->mode != LWSCM_HTTP2_SERVING))
lws_header_table_detach(wsi, 1);
}
break;
}
goto try_pollout;
}
len = lws_ssl_capable_read(wsi, pt->serv_buf,
LWS_MAX_SOCKET_IO_BUF);
lwsl_debug("%s: wsi %p read %d\r\n", __func__, wsi, len);
switch (len) {
case 0:
lwsl_info("%s: read 0 len\n", __func__);
/* lwsl_info(" state=%d\n", wsi->state); */
// if (!wsi->hdr_parsing_completed)
// lws_header_table_detach(wsi);
/* fallthru */
case LWS_SSL_CAPABLE_ERROR:
goto fail;
case LWS_SSL_CAPABLE_MORE_SERVICE:
goto try_pollout;
}
/* just ignore incoming if waiting for close */
if (wsi->state != LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE) {
/*
* hm this may want to send
* (via HTTP callback for example)
*/
n = lws_read(wsi, pt->serv_buf, len);
if (n < 0) /* we closed wsi */
return 1;
/* hum he may have used up the
* writability above */
break;
}
try_pollout:
/* this handles POLLOUT for http serving fragments */
if (!(pollfd->revents & LWS_POLLOUT))
break;
/* one shot */
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_notice("%s a\n", __func__);
goto fail;
}
if (!wsi->hdr_parsing_completed)
break;
if (wsi->state != LWSS_HTTP_ISSUING_FILE) {
n = user_callback_handle_rxflow(wsi->protocol->callback,
wsi, LWS_CALLBACK_HTTP_WRITEABLE,
wsi->user_space, NULL, 0);
if (n < 0) {
lwsl_info("writeable_fail\n");
goto fail;
}
break;
}
/* >0 == completion, <0 == error */
n = lws_serve_http_file_fragment(wsi);
if (n < 0 || (n > 0 && lws_http_transaction_completed(wsi))) {
lwsl_info("completed\n");
goto fail;
}
break;
case LWSCM_SERVER_LISTENER:
#if LWS_POSIX
/* pollin means a client has connected to us then */
do {
if (!(pollfd->revents & LWS_POLLIN) || !(pollfd->events & LWS_POLLIN))
break;
/* listen socket got an unencrypted connection... */
clilen = sizeof(cli_addr);
lws_latency_pre(context, wsi);
accept_fd = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
&clilen);
lws_latency(context, wsi, "listener accept", accept_fd,
accept_fd >= 0);
if (accept_fd < 0) {
if (LWS_ERRNO == LWS_EAGAIN ||
LWS_ERRNO == LWS_EWOULDBLOCK) {
lwsl_err("accept asks to try again\n");
break;
}
lwsl_err("ERROR on accept: %s\n", strerror(LWS_ERRNO));
break;
}
lws_plat_set_socket_options(context, accept_fd);
lwsl_debug("accepted new conn port %u on fd=%d\n",
ntohs(cli_addr.sin_port), accept_fd);
#else
/* not very beautiful... */
accept_fd = (lws_sockfd_type)pollfd;
#endif
/*
* look at who we connected to and give user code a chance
* to reject based on client IP. There's no protocol selected
* yet so we issue this to protocols[0]
*/
if ((context->protocols[0].callback)(wsi,
LWS_CALLBACK_FILTER_NETWORK_CONNECTION,
NULL, (void *)(long)accept_fd, 0)) {
lwsl_debug("Callback denied network connection\n");
compatible_close(accept_fd);
break;
}
if (!lws_adopt_socket(context, accept_fd))
/* already closed cleanly as necessary */
return 1;
#if LWS_POSIX
} while (pt->fds_count < context->fd_limit_per_thread - 1 &&
lws_poll_listen_fd(&pt->fds[wsi->position_in_fds_table]) > 0);
#endif
return 0;
default:
break;
}
if (!lws_server_socket_service_ssl(wsi, accept_fd))
return 0;
fail:
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return 1;
}
