626 lines
16 KiB
C
626 lines
16 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010-2015 Andy Green <andy@warmcat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation:
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include "private-libwebsockets.h"
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static int
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lws_0405_frame_mask_generate(struct lws *wsi)
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{
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int n;
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/* fetch the per-frame nonce */
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n = lws_get_random(lws_get_context(wsi), wsi->u.ws.mask_nonce, 4);
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if (n != 4) {
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lwsl_parser("Unable to read from random device %s %d\n",
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SYSTEM_RANDOM_FILEPATH, n);
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return 1;
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}
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/* start masking from first byte of masking key buffer */
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wsi->u.ws.frame_mask_index = 0;
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return 0;
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}
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#ifdef _DEBUG
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LWS_VISIBLE void lwsl_hexdump(void *vbuf, size_t len)
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{
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unsigned char *buf = (unsigned char *)vbuf;
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unsigned int n, m, start;
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char line[80];
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char *p;
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lwsl_parser("\n");
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for (n = 0; n < len;) {
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start = n;
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p = line;
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p += sprintf(p, "%04X: ", start);
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for (m = 0; m < 16 && n < len; m++)
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p += sprintf(p, "%02X ", buf[n++]);
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while (m++ < 16)
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p += sprintf(p, " ");
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p += sprintf(p, " ");
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for (m = 0; m < 16 && (start + m) < len; m++) {
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if (buf[start + m] >= ' ' && buf[start + m] < 127)
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*p++ = buf[start + m];
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else
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*p++ = '.';
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}
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while (m++ < 16)
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*p++ = ' ';
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*p++ = '\n';
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*p = '\0';
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lwsl_debug("%s", line);
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}
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lwsl_debug("\n");
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}
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#endif
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/*
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* notice this returns number of bytes consumed, or -1
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*/
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int lws_issue_raw(struct lws *wsi, unsigned char *buf, size_t len)
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{
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struct lws_context *context = lws_get_context(wsi);
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size_t real_len = len;
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int n, m;
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if (!len)
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return 0;
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/* just ignore sends after we cleared the truncation buffer */
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if (wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE &&
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!wsi->trunc_len)
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return len;
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if (wsi->trunc_len && (buf < wsi->trunc_alloc ||
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buf > (wsi->trunc_alloc + wsi->trunc_len +
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wsi->trunc_offset))) {
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lwsl_err("****** %x Sending new, pending truncated ...\n", wsi);
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assert(0);
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}
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m = lws_ext_cb_wsi_active_exts(wsi,
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LWS_EXT_CALLBACK_PACKET_TX_DO_SEND, &buf, len);
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if (m < 0)
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return -1;
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if (m) /* handled */ {
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n = m;
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goto handle_truncated_send;
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}
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if (!lws_socket_is_valid(wsi->sock))
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lwsl_warn("** error invalid sock but expected to send\n");
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/* nope, send it on the socket directly */
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lws_latency_pre(context, wsi);
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n = lws_ssl_capable_write(wsi, buf, len);
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lws_latency(context, wsi, "send lws_issue_raw", n,
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(unsigned int)n == len);
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switch (n) {
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case LWS_SSL_CAPABLE_ERROR:
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lwsl_err("%s: wsi %p: LWS_SSL_CAPABLE_ERROR\n", __func__,
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(void *)wsi);
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/* we're going to close, let close know sends aren't possible */
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wsi->socket_is_permanently_unusable = 1;
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return -1;
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case LWS_SSL_CAPABLE_MORE_SERVICE:
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/* nothing got sent, not fatal, retry the whole thing later */
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n = 0;
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break;
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}
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handle_truncated_send:
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/*
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* we were already handling a truncated send?
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*/
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if (wsi->trunc_len) {
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lwsl_info("%p partial adv %d (vs %d)\n", wsi, n, real_len);
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wsi->trunc_offset += n;
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wsi->trunc_len -= n;
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if (!wsi->trunc_len) {
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lwsl_info("***** %x partial send completed\n", wsi);
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/* done with it, but don't free it */
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n = real_len;
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if (wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE) {
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lwsl_info("***** %x signalling to close now\n", wsi);
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return -1; /* retry closing now */
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}
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}
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/* always callback on writeable */
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lws_callback_on_writable(wsi);
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return n;
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}
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if ((unsigned int)n == real_len)
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/* what we just sent went out cleanly */
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return n;
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if (n && wsi->u.ws.clean_buffer)
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/*
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* This buffer unaffected by extension rewriting.
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* It means the user code is expected to deal with
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* partial sends. (lws knows the header was already
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* sent, so on next send will just resume sending
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* payload)
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*/
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return n;
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/*
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* Newly truncated send. Buffer the remainder (it will get
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* first priority next time the socket is writable)
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*/
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lwsl_info("%p new partial sent %d from %d total\n", wsi, n, real_len);
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/*
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* - if we still have a suitable malloc lying around, use it
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* - or, if too small, reallocate it
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* - or, if no buffer, create it
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*/
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if (!wsi->trunc_alloc || real_len - n > wsi->trunc_alloc_len) {
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lws_free(wsi->trunc_alloc);
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wsi->trunc_alloc_len = real_len - n;
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wsi->trunc_alloc = lws_malloc(real_len - n);
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if (!wsi->trunc_alloc) {
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lwsl_err("truncated send: unable to malloc %d\n",
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real_len - n);
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return -1;
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}
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}
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wsi->trunc_offset = 0;
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wsi->trunc_len = real_len - n;
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memcpy(wsi->trunc_alloc, buf + n, real_len - n);
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/* since something buffered, force it to get another chance to send */
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lws_callback_on_writable(wsi);
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return real_len;
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}
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/**
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* lws_write() - Apply protocol then write data to client
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* @wsi: Websocket instance (available from user callback)
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* @buf: The data to send. For data being sent on a websocket
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* connection (ie, not default http), this buffer MUST have
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* LWS_SEND_BUFFER_PRE_PADDING bytes valid BEFORE the pointer
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* and an additional LWS_SEND_BUFFER_POST_PADDING bytes valid
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* in the buffer after (buf + len). This is so the protocol
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* header and trailer data can be added in-situ.
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* @len: Count of the data bytes in the payload starting from buf
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* @protocol: Use LWS_WRITE_HTTP to reply to an http connection, and one
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* of LWS_WRITE_BINARY or LWS_WRITE_TEXT to send appropriate
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* data on a websockets connection. Remember to allow the extra
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* bytes before and after buf if LWS_WRITE_BINARY or LWS_WRITE_TEXT
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* are used.
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*
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* This function provides the way to issue data back to the client
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* for both http and websocket protocols.
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*
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* In the case of sending using websocket protocol, be sure to allocate
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* valid storage before and after buf as explained above. This scheme
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* allows maximum efficiency of sending data and protocol in a single
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* packet while not burdening the user code with any protocol knowledge.
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*
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* Return may be -1 for a fatal error needing connection close, or a
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* positive number reflecting the amount of bytes actually sent. This
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* can be less than the requested number of bytes due to OS memory
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* pressure at any given time.
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*/
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LWS_VISIBLE int lws_write(struct lws *wsi, unsigned char *buf,
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size_t len, enum lws_write_protocol protocol)
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{
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int masked7 = wsi->mode == LWSCM_WS_CLIENT;
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unsigned char is_masked_bit = 0;
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unsigned char *dropmask = NULL;
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struct lws_tokens eff_buf;
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int post = 0, pre = 0, n;
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size_t orig_len = len;
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if (len == 0 && protocol != LWS_WRITE_CLOSE &&
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protocol != LWS_WRITE_PING && protocol != LWS_WRITE_PONG) {
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lwsl_warn("zero length lws_write attempt\n");
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return 0;
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}
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if (protocol == LWS_WRITE_HTTP ||
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protocol == LWS_WRITE_HTTP_FINAL ||
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protocol == LWS_WRITE_HTTP_HEADERS)
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goto send_raw;
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/* websocket protocol, either binary or text */
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if (wsi->state != LWSS_ESTABLISHED &&
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!(wsi->state == LWSS_RETURNED_CLOSE_ALREADY &&
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protocol == LWS_WRITE_CLOSE))
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return -1;
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/* if we are continuing a frame that already had its header done */
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if (wsi->u.ws.inside_frame)
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goto do_more_inside_frame;
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wsi->u.ws.clean_buffer = 1;
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/*
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* give a chance to the extensions to modify payload
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* pre-TX mangling is not allowed to truncate
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*/
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eff_buf.token = (char *)buf;
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eff_buf.token_len = len;
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switch (protocol) {
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case LWS_WRITE_PING:
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case LWS_WRITE_PONG:
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case LWS_WRITE_CLOSE:
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break;
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default:
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if (lws_ext_cb_wsi_active_exts(wsi, LWS_EXT_CALLBACK_PAYLOAD_TX,
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&eff_buf, 0) < 0)
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return -1;
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}
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/*
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* an extension did something we need to keep... for example, if
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* compression extension, it has already updated its state according
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* to this being issued
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*/
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if ((char *)buf != eff_buf.token)
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/*
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* extension recreated it:
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* need to buffer this if not all sent
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*/
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wsi->u.ws.clean_buffer = 0;
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buf = (unsigned char *)eff_buf.token;
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len = eff_buf.token_len;
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switch (wsi->ietf_spec_revision) {
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case 13:
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if (masked7) {
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pre += 4;
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dropmask = &buf[0 - pre];
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is_masked_bit = 0x80;
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}
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switch (protocol & 0xf) {
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case LWS_WRITE_TEXT:
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n = LWSWSOPC_TEXT_FRAME;
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break;
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case LWS_WRITE_BINARY:
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n = LWSWSOPC_BINARY_FRAME;
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break;
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case LWS_WRITE_CONTINUATION:
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n = LWSWSOPC_CONTINUATION;
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break;
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case LWS_WRITE_CLOSE:
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n = LWSWSOPC_CLOSE;
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/*
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* 06+ has a 2-byte status code in network order
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* we can do this because we demand post-buf
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*/
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if (wsi->u.ws.close_reason) {
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/* reason codes count as data bytes */
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buf[0] = (unsigned char)(wsi->u.ws.close_reason >> 8);
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buf[1] = (unsigned char)wsi->u.ws.close_reason;
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len += 2;
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}
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break;
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case LWS_WRITE_PING:
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n = LWSWSOPC_PING;
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break;
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case LWS_WRITE_PONG:
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n = LWSWSOPC_PONG;
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break;
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default:
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lwsl_warn("lws_write: unknown write opc / protocol\n");
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return -1;
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}
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if (!(protocol & LWS_WRITE_NO_FIN))
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n |= 1 << 7;
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if (len < 126) {
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pre += 2;
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buf[-pre] = n;
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buf[-pre + 1] = (unsigned char)(len | is_masked_bit);
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} else {
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if (len < 65536) {
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pre += 4;
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buf[-pre] = n;
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buf[-pre + 1] = 126 | is_masked_bit;
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buf[-pre + 2] = (unsigned char)(len >> 8);
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buf[-pre + 3] = (unsigned char)len;
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} else {
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pre += 10;
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buf[-pre] = n;
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buf[-pre + 1] = 127 | is_masked_bit;
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#if defined __LP64__
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buf[-pre + 2] = (len >> 56) & 0x7f;
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buf[-pre + 3] = len >> 48;
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buf[-pre + 4] = len >> 40;
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buf[-pre + 5] = len >> 32;
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#else
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buf[-pre + 2] = 0;
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buf[-pre + 3] = 0;
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buf[-pre + 4] = 0;
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buf[-pre + 5] = 0;
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#endif
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buf[-pre + 6] = (unsigned char)(len >> 24);
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buf[-pre + 7] = (unsigned char)(len >> 16);
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buf[-pre + 8] = (unsigned char)(len >> 8);
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buf[-pre + 9] = (unsigned char)len;
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}
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}
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break;
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}
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do_more_inside_frame:
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/*
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* Deal with masking if we are in client -> server direction and
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* the protocol demands it
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*/
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if (wsi->mode == LWSCM_WS_CLIENT) {
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if (!wsi->u.ws.inside_frame)
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if (lws_0405_frame_mask_generate(wsi)) {
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lwsl_err("frame mask generation failed\n");
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return -1;
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}
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/*
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* in v7, just mask the payload
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*/
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if (dropmask) { /* never set if already inside frame */
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for (n = 4; n < (int)len + 4; n++)
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dropmask[n] = dropmask[n] ^
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wsi->u.ws.mask_nonce[
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(wsi->u.ws.frame_mask_index++) & 3];
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/* copy the frame nonce into place */
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memcpy(dropmask, wsi->u.ws.mask_nonce, 4);
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}
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}
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send_raw:
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switch (protocol) {
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case LWS_WRITE_CLOSE:
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/* lwsl_hexdump(&buf[-pre], len + post); */
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case LWS_WRITE_HTTP:
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case LWS_WRITE_HTTP_FINAL:
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case LWS_WRITE_HTTP_HEADERS:
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case LWS_WRITE_PONG:
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case LWS_WRITE_PING:
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#ifdef LWS_USE_HTTP2
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if (wsi->mode == LWSCM_HTTP2_SERVING) {
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unsigned char flags = 0;
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n = LWS_HTTP2_FRAME_TYPE_DATA;
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if (protocol == LWS_WRITE_HTTP_HEADERS) {
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n = LWS_HTTP2_FRAME_TYPE_HEADERS;
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flags = LWS_HTTP2_FLAG_END_HEADERS;
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if (wsi->u.http2.send_END_STREAM)
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flags |= LWS_HTTP2_FLAG_END_STREAM;
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}
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if ((protocol == LWS_WRITE_HTTP || protocol == LWS_WRITE_HTTP_FINAL) && wsi->u.http.content_length) {
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wsi->u.http.content_remain -= len;
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lwsl_info("%s: content_remain = %lu\n", __func__, wsi->u.http.content_remain);
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if (!wsi->u.http.content_remain) {
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lwsl_info("%s: selecting final write mode\n", __func__);
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protocol = LWS_WRITE_HTTP_FINAL;
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}
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}
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if (protocol == LWS_WRITE_HTTP_FINAL && wsi->u.http2.END_STREAM) {
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lwsl_info("%s: setting END_STREAM\n", __func__);
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flags |= LWS_HTTP2_FLAG_END_STREAM;
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}
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return lws_http2_frame_write(wsi, n, flags, wsi->u.http2.my_stream_id, len, buf);
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}
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#endif
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return lws_issue_raw(wsi, (unsigned char *)buf - pre,
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len + pre + post);
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default:
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break;
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}
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wsi->u.ws.inside_frame = 1;
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/*
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* give any active extensions a chance to munge the buffer
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* before send. We pass in a pointer to an lws_tokens struct
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* prepared with the default buffer and content length that's in
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* there. Rather than rewrite the default buffer, extensions
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* that expect to grow the buffer can adapt .token to
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* point to their own per-connection buffer in the extension
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* user allocation. By default with no extensions or no
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* extension callback handling, just the normal input buffer is
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* used then so it is efficient.
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*
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* callback returns 1 in case it wants to spill more buffers
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*
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* This takes care of holding the buffer if send is incomplete, ie,
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* if wsi->u.ws.clean_buffer is 0 (meaning an extension meddled with
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* the buffer). If wsi->u.ws.clean_buffer is 1, it will instead
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* return to the user code how much OF THE USER BUFFER was consumed.
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*/
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n = lws_issue_raw_ext_access(wsi, buf - pre, len + pre + post);
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if (n <= 0)
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return n;
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if (n == (int)len + pre + post) {
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/* everything in the buffer was handled (or rebuffered...) */
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wsi->u.ws.inside_frame = 0;
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return orig_len;
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}
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/*
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* it is how many bytes of user buffer got sent... may be < orig_len
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* in which case callback when writable has already been arranged
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* and user code can call lws_write() again with the rest
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* later.
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*/
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return n - (pre + post);
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}
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LWS_VISIBLE int lws_serve_http_file_fragment(struct lws *wsi)
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{
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struct lws_context *context = wsi->context;
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unsigned long amount;
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int n, m;
|
|
|
|
while (!lws_send_pipe_choked(wsi)) {
|
|
if (wsi->trunc_len) {
|
|
if (lws_issue_raw(wsi, wsi->trunc_alloc +
|
|
wsi->trunc_offset,
|
|
wsi->trunc_len) < 0) {
|
|
lwsl_info("%s: closing\n", __func__);
|
|
return -1;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (wsi->u.http.filepos == wsi->u.http.filelen)
|
|
goto all_sent;
|
|
|
|
if (lws_plat_file_read(wsi, wsi->u.http.fd, &amount,
|
|
context->serv_buf,
|
|
sizeof(context->serv_buf)) < 0)
|
|
return -1; /* caller will close */
|
|
|
|
n = (int)amount;
|
|
if (n) {
|
|
lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
|
|
AWAITING_TIMEOUT);
|
|
wsi->u.http.filepos += n;
|
|
m = lws_write(wsi, context->serv_buf, n,
|
|
wsi->u.http.filepos == wsi->u.http.filelen ?
|
|
LWS_WRITE_HTTP_FINAL : LWS_WRITE_HTTP);
|
|
if (m < 0)
|
|
return -1;
|
|
|
|
if (m != n)
|
|
/* adjust for what was not sent */
|
|
if (lws_plat_file_seek_cur(wsi, wsi->u.http.fd,
|
|
m - n) ==
|
|
(unsigned long)-1)
|
|
return -1;
|
|
}
|
|
all_sent:
|
|
if (!wsi->trunc_len && wsi->u.http.filepos == wsi->u.http.filelen) {
|
|
wsi->state = LWSS_HTTP;
|
|
|
|
/* we might be in keepalive, so close it off here */
|
|
lws_plat_file_close(wsi, wsi->u.http.fd);
|
|
wsi->u.http.fd = LWS_INVALID_FILE;
|
|
|
|
if (wsi->protocol->callback)
|
|
/* ignore callback returned value */
|
|
user_callback_handle_rxflow(
|
|
wsi->protocol->callback, wsi,
|
|
LWS_CALLBACK_HTTP_FILE_COMPLETION,
|
|
wsi->user_space, NULL, 0);
|
|
return 1; /* >0 indicates completed */
|
|
}
|
|
}
|
|
|
|
lwsl_info("choked before able to send whole file (post)\n");
|
|
lws_callback_on_writable(wsi);
|
|
|
|
return 0; /* indicates further processing must be done */
|
|
}
|
|
|
|
#if LWS_POSIX
|
|
LWS_VISIBLE int
|
|
lws_ssl_capable_read_no_ssl(struct lws *wsi, unsigned char *buf, int len)
|
|
{
|
|
int n;
|
|
|
|
n = recv(wsi->sock, (char *)buf, len, 0);
|
|
if (n > 0)
|
|
return n;
|
|
#if LWS_POSIX
|
|
if (LWS_ERRNO == LWS_EAGAIN ||
|
|
LWS_ERRNO == LWS_EWOULDBLOCK ||
|
|
LWS_ERRNO == LWS_EINTR)
|
|
return LWS_SSL_CAPABLE_MORE_SERVICE;
|
|
#endif
|
|
lwsl_warn("error on reading from skt\n");
|
|
return LWS_SSL_CAPABLE_ERROR;
|
|
}
|
|
|
|
LWS_VISIBLE int
|
|
lws_ssl_capable_write_no_ssl(struct lws *wsi, unsigned char *buf, int len)
|
|
{
|
|
int n = 0;
|
|
|
|
#if LWS_POSIX
|
|
n = send(wsi->sock, (char *)buf, len, MSG_NOSIGNAL);
|
|
if (n >= 0)
|
|
return n;
|
|
|
|
if (LWS_ERRNO == LWS_EAGAIN ||
|
|
LWS_ERRNO == LWS_EWOULDBLOCK ||
|
|
LWS_ERRNO == LWS_EINTR) {
|
|
if (LWS_ERRNO == LWS_EWOULDBLOCK)
|
|
lws_set_blocking_send(wsi);
|
|
|
|
return LWS_SSL_CAPABLE_MORE_SERVICE;
|
|
}
|
|
#else
|
|
(void)n;
|
|
(void)wsi;
|
|
(void)buf;
|
|
(void)len;
|
|
// !!!
|
|
#endif
|
|
|
|
lwsl_debug("ERROR writing len %d to skt %d\n", len, n);
|
|
return LWS_SSL_CAPABLE_ERROR;
|
|
}
|
|
#endif
|
|
LWS_VISIBLE int
|
|
lws_ssl_pending_no_ssl(struct lws *wsi)
|
|
{
|
|
(void)wsi;
|
|
return 0;
|
|
}
|