mirror of
https://github.com/warmcat/libwebsockets.git
synced 2025-03-16 00:00:07 +01:00

Add initial support for defining servers using Secure Streams policy and api semantics. Serving h1, h2 and ws should be functional, the new minimal example shows a combined http + SS server with an incrementing ws message shown in the browser over tls, in around 200 lines of user code. NOP out anything to do with plugins, they're not currently used. Update the docs correspondingly.
635 lines
16 KiB
C
635 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 - 2019 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "private-lib-core.h"
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#include "lextable-strings.h"
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const unsigned char *
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lws_token_to_string(enum lws_token_indexes token)
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{
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if ((unsigned int)token >= LWS_ARRAY_SIZE(set))
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return NULL;
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return (unsigned char *)set[token];
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}
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int
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lws_add_http_header_by_name(struct lws *wsi, const unsigned char *name,
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const unsigned char *value, int length,
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unsigned char **p, unsigned char *end)
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{
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#ifdef LWS_WITH_HTTP2
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if (lwsi_role_h2(wsi) || lwsi_role_h2_ENCAPSULATION(wsi))
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return lws_add_http2_header_by_name(wsi, name,
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value, length, p, end);
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#else
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(void)wsi;
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#endif
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if (name) {
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while (*p < end && *name)
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*((*p)++) = *name++;
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if (*p == end)
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return 1;
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*((*p)++) = ' ';
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}
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if (*p + length + 3 >= end)
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return 1;
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memcpy(*p, value, length);
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*p += length;
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*((*p)++) = '\x0d';
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*((*p)++) = '\x0a';
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return 0;
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}
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int lws_finalize_http_header(struct lws *wsi, unsigned char **p,
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unsigned char *end)
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{
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#ifdef LWS_WITH_HTTP2
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if (lwsi_role_h2(wsi) || lwsi_role_h2_ENCAPSULATION(wsi))
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return 0;
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#else
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(void)wsi;
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#endif
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if ((lws_intptr_t)(end - *p) < 3)
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return 1;
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*((*p)++) = '\x0d';
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*((*p)++) = '\x0a';
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return 0;
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}
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int
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lws_finalize_write_http_header(struct lws *wsi, unsigned char *start,
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unsigned char **pp, unsigned char *end)
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{
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unsigned char *p;
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int len;
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if (lws_finalize_http_header(wsi, pp, end))
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return 1;
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p = *pp;
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len = lws_ptr_diff(p, start);
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#if defined(LWS_WITH_DETAILED_LATENCY)
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wsi->detlat.earliest_write_req_pre_write = lws_now_usecs();
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#endif
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if (lws_write(wsi, start, len, LWS_WRITE_HTTP_HEADERS) != len)
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return 1;
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return 0;
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}
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int
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lws_add_http_header_by_token(struct lws *wsi, enum lws_token_indexes token,
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const unsigned char *value, int length,
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unsigned char **p, unsigned char *end)
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{
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const unsigned char *name;
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#ifdef LWS_WITH_HTTP2
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if (lwsi_role_h2(wsi) || lwsi_role_h2_ENCAPSULATION(wsi))
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return lws_add_http2_header_by_token(wsi, token, value,
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length, p, end);
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#endif
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name = lws_token_to_string(token);
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if (!name)
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return 1;
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return lws_add_http_header_by_name(wsi, name, value, length, p, end);
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}
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int
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lws_add_http_header_content_length(struct lws *wsi,
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lws_filepos_t content_length,
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unsigned char **p, unsigned char *end)
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{
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char b[24];
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int n;
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n = lws_snprintf(b, sizeof(b) - 1, "%llu", (unsigned long long)content_length);
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if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH,
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(unsigned char *)b, n, p, end))
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return 1;
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wsi->http.tx_content_length = content_length;
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wsi->http.tx_content_remain = content_length;
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lwsl_info("%s: wsi %p: tx_content_length/remain %llu\n", __func__,
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wsi, (unsigned long long)content_length);
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return 0;
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}
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#if defined(LWS_WITH_SERVER)
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int
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lws_add_http_common_headers(struct lws *wsi, unsigned int code,
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const char *content_type, lws_filepos_t content_len,
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unsigned char **p, unsigned char *end)
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{
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const char *ka[] = { "close", "keep-alive" };
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int types[] = { HTTP_CONNECTION_CLOSE, HTTP_CONNECTION_KEEP_ALIVE },
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t = 0;
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if (lws_add_http_header_status(wsi, code, p, end))
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return 1;
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if (content_type &&
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lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE,
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(unsigned char *)content_type,
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(int)strlen(content_type), p, end))
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return 1;
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#if defined(LWS_WITH_HTTP_STREAM_COMPRESSION)
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if (!wsi->http.lcs &&
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(!strncmp(content_type, "text/", 5) ||
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!strcmp(content_type, "application/javascript") ||
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!strcmp(content_type, "image/svg+xml")))
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lws_http_compression_apply(wsi, NULL, p, end, 0);
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#endif
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/*
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* if we decided to compress it, we don't know the content length...
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* the compressed data will go out chunked on h1
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*/
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if (
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#if defined(LWS_WITH_HTTP_STREAM_COMPRESSION)
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!wsi->http.lcs &&
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#endif
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content_len != LWS_ILLEGAL_HTTP_CONTENT_LEN) {
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if (lws_add_http_header_content_length(wsi, content_len,
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p, end))
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return 1;
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} else {
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/* there was no length... it normally means CONNECTION_CLOSE */
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#if defined(LWS_WITH_HTTP_STREAM_COMPRESSION)
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if (!wsi->mux_substream && wsi->http.lcs) {
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/* so...
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* - h1 connection
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* - http compression transform active
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* - did not send content length
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*
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* then mark as chunked...
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*/
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wsi->http.comp_ctx.chunking = 1;
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if (lws_add_http_header_by_token(wsi,
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WSI_TOKEN_HTTP_TRANSFER_ENCODING,
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(unsigned char *)"chunked", 7, p, end))
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return -1;
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/* ... but h1 compression is chunked, if active we can
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* still pipeline
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*/
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if (wsi->http.lcs &&
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wsi->http.conn_type == HTTP_CONNECTION_KEEP_ALIVE)
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t = 1;
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}
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#endif
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if (!wsi->mux_substream) {
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if (lws_add_http_header_by_token(wsi,
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WSI_TOKEN_CONNECTION,
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(unsigned char *)ka[t],
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(int)strlen(ka[t]), p, end))
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return 1;
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wsi->http.conn_type = types[t];
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}
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}
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return 0;
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}
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static const char * const err400[] = {
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"Bad Request",
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"Unauthorized",
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"Payment Required",
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"Forbidden",
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"Not Found",
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"Method Not Allowed",
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"Not Acceptable",
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"Proxy Auth Required",
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"Request Timeout",
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"Conflict",
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"Gone",
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"Length Required",
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"Precondition Failed",
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"Request Entity Too Large",
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"Request URI too Long",
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"Unsupported Media Type",
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"Requested Range Not Satisfiable",
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"Expectation Failed"
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};
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static const char * const err500[] = {
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"Internal Server Error",
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"Not Implemented",
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"Bad Gateway",
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"Service Unavailable",
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"Gateway Timeout",
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"HTTP Version Not Supported"
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};
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/* security best practices from Mozilla Observatory */
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static const
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struct lws_protocol_vhost_options pvo_hsbph[] = {{
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NULL, NULL, "referrer-policy:", "no-referrer"
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}, {
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&pvo_hsbph[0], NULL, "x-frame-options:", "deny"
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}, {
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&pvo_hsbph[1], NULL, "x-xss-protection:", "1; mode=block"
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}, {
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&pvo_hsbph[2], NULL, "x-content-type-options:", "nosniff"
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}, {
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&pvo_hsbph[3], NULL, "content-security-policy:",
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"default-src 'none'; img-src 'self' data: ; "
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"script-src 'self'; font-src 'self'; "
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"style-src 'self'; connect-src 'self' ws: wss:; "
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"frame-ancestors 'none'; base-uri 'none';"
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"form-action 'self';"
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}};
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int
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lws_add_http_header_status(struct lws *wsi, unsigned int _code,
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unsigned char **p, unsigned char *end)
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{
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static const char * const hver[] = {
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"HTTP/1.0", "HTTP/1.1", "HTTP/2"
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};
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const struct lws_protocol_vhost_options *headers;
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unsigned int code = _code & LWSAHH_CODE_MASK;
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const char *description = "", *p1;
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unsigned char code_and_desc[60];
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int n;
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#ifdef LWS_WITH_ACCESS_LOG
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wsi->http.access_log.response = code;
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#endif
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#ifdef LWS_WITH_HTTP2
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if (lwsi_role_h2(wsi) || lwsi_role_h2_ENCAPSULATION(wsi)) {
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n = lws_add_http2_header_status(wsi, code, p, end);
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if (n)
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return n;
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} else
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#endif
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{
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if (code >= 400 && code < (400 + LWS_ARRAY_SIZE(err400)))
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description = err400[code - 400];
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if (code >= 500 && code < (500 + LWS_ARRAY_SIZE(err500)))
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description = err500[code - 500];
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if (code == 100)
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description = "Continue";
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if (code == 200)
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description = "OK";
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if (code == 304)
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description = "Not Modified";
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else
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if (code >= 300 && code < 400)
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description = "Redirect";
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if (wsi->http.request_version < LWS_ARRAY_SIZE(hver))
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p1 = hver[wsi->http.request_version];
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else
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p1 = hver[0];
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n = lws_snprintf((char *)code_and_desc,
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sizeof(code_and_desc) - 1, "%s %u %s",
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p1, code, description);
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if (lws_add_http_header_by_name(wsi, NULL, code_and_desc, n, p,
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end))
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return 1;
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}
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headers = wsi->a.vhost->headers;
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while (headers) {
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if (lws_add_http_header_by_name(wsi,
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(const unsigned char *)headers->name,
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(unsigned char *)headers->value,
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(int)strlen(headers->value), p, end))
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return 1;
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headers = headers->next;
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}
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if (wsi->a.vhost->options &
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LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE) {
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headers = &pvo_hsbph[LWS_ARRAY_SIZE(pvo_hsbph) - 1];
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while (headers) {
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if (lws_add_http_header_by_name(wsi,
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(const unsigned char *)headers->name,
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(unsigned char *)headers->value,
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(int)strlen(headers->value), p, end))
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return 1;
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headers = headers->next;
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}
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}
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if (wsi->a.context->server_string &&
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!(_code & LWSAHH_FLAG_NO_SERVER_NAME)) {
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assert(wsi->a.context->server_string_len > 0);
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if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_SERVER,
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(unsigned char *)wsi->a.context->server_string,
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wsi->a.context->server_string_len, p, end))
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return 1;
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}
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if (wsi->a.vhost->options & LWS_SERVER_OPTION_STS)
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if (lws_add_http_header_by_name(wsi, (unsigned char *)
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"Strict-Transport-Security:",
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(unsigned char *)"max-age=15768000 ; "
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"includeSubDomains", 36, p, end))
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return 1;
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if (*p >= (end - 2)) {
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lwsl_err("%s: reached end of buffer\n", __func__);
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return 1;
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}
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return 0;
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}
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int
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lws_return_http_status(struct lws *wsi, unsigned int code,
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const char *html_body)
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{
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struct lws_context *context = lws_get_context(wsi);
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struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
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unsigned char *p = pt->serv_buf + LWS_PRE;
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unsigned char *start = p;
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unsigned char *end = p + context->pt_serv_buf_size - LWS_PRE;
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char *body = (char *)start + context->pt_serv_buf_size - 512;
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int n = 0, m = 0, len;
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char slen[20];
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if (!wsi->a.vhost) {
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lwsl_err("%s: wsi not bound to vhost\n", __func__);
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return 1;
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}
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#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
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if (!wsi->handling_404 &&
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wsi->a.vhost->http.error_document_404 &&
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code == HTTP_STATUS_NOT_FOUND)
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/* we should do a redirect, and do the 404 there */
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if (lws_http_redirect(wsi, HTTP_STATUS_FOUND,
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(uint8_t *)wsi->a.vhost->http.error_document_404,
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(int)strlen(wsi->a.vhost->http.error_document_404),
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&p, end) > 0)
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return 0;
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#endif
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/* if the redirect failed, just do a simple status */
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p = start;
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if (!html_body)
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html_body = "";
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if (lws_add_http_header_status(wsi, code, &p, end))
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return 1;
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if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE,
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(unsigned char *)"text/html", 9,
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&p, end))
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return 1;
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len = lws_snprintf(body, 510, "<html><head>"
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"<meta charset=utf-8 http-equiv=\"Content-Language\" "
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"content=\"en\"/>"
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"<link rel=\"stylesheet\" type=\"text/css\" "
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"href=\"/error.css\"/>"
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"</head><body><h1>%u</h1>%s</body></html>", code, html_body);
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n = lws_snprintf(slen, 12, "%d", len);
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if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH,
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(unsigned char *)slen, n, &p, end))
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return 1;
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if (lws_finalize_http_header(wsi, &p, end))
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return 1;
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#if defined(LWS_WITH_HTTP2)
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if (wsi->mux_substream) {
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/*
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* for HTTP/2, the headers must be sent separately, since they
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* go out in their own frame. That puts us in a bind that
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* we won't always be able to get away with two lws_write()s in
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* sequence, since the first may use up the writability due to
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* the pipe being choked or SSL_WANT_.
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*
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* However we do need to send the human-readable body, and the
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* END_STREAM.
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*
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* Solve it by writing the headers now...
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*/
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#if defined(LWS_WITH_DETAILED_LATENCY)
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wsi->detlat.earliest_write_req_pre_write = lws_now_usecs();
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#endif
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m = lws_write(wsi, start, lws_ptr_diff(p, start),
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LWS_WRITE_HTTP_HEADERS);
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if (m != lws_ptr_diff(p, start))
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return 1;
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/*
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* ... but stash the body and send it as a priority next
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* handle_POLLOUT
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*/
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wsi->http.tx_content_length = len;
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wsi->http.tx_content_remain = len;
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wsi->h2.pending_status_body = lws_malloc(len + LWS_PRE + 1,
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"pending status body");
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if (!wsi->h2.pending_status_body)
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return -1;
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strcpy(wsi->h2.pending_status_body + LWS_PRE, body);
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lws_callback_on_writable(wsi);
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return 0;
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} else
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#endif
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{
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/*
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* for http/1, we can just append the body after the finalized
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* headers and send it all in one go.
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*/
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n = lws_ptr_diff(p, start) + len;
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memcpy(p, body, len);
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m = lws_write(wsi, start, n, LWS_WRITE_HTTP);
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if (m != n)
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return 1;
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}
|
|
|
|
return m != n;
|
|
}
|
|
|
|
int
|
|
lws_http_redirect(struct lws *wsi, int code, const unsigned char *loc, int len,
|
|
unsigned char **p, unsigned char *end)
|
|
{
|
|
unsigned char *start = *p;
|
|
|
|
if (lws_add_http_header_status(wsi, code, p, end))
|
|
return -1;
|
|
|
|
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_LOCATION, loc, len,
|
|
p, end))
|
|
return -1;
|
|
/*
|
|
* if we're going with http/1.1 and keepalive, we have to give fake
|
|
* content metadata so the client knows we completed the transaction and
|
|
* it can do the redirect...
|
|
*/
|
|
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE,
|
|
(unsigned char *)"text/html", 9, p,
|
|
end))
|
|
return -1;
|
|
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH,
|
|
(unsigned char *)"0", 1, p, end))
|
|
return -1;
|
|
|
|
if (lws_finalize_http_header(wsi, p, end))
|
|
return -1;
|
|
|
|
return lws_write(wsi, start, *p - start, LWS_WRITE_HTTP_HEADERS |
|
|
LWS_WRITE_H2_STREAM_END);
|
|
}
|
|
#endif
|
|
|
|
#if !defined(LWS_WITH_HTTP_STREAM_COMPRESSION)
|
|
int
|
|
lws_http_compression_apply(struct lws *wsi, const char *name,
|
|
unsigned char **p, unsigned char *end, char decomp)
|
|
{
|
|
(void)wsi;
|
|
(void)name;
|
|
(void)p;
|
|
(void)end;
|
|
(void)decomp;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int
|
|
lws_http_headers_detach(struct lws *wsi)
|
|
{
|
|
return lws_header_table_detach(wsi, 0);
|
|
}
|
|
|
|
#if defined(LWS_WITH_SERVER)
|
|
|
|
void
|
|
lws_sul_http_ah_lifecheck(lws_sorted_usec_list_t *sul)
|
|
{
|
|
struct allocated_headers *ah;
|
|
struct lws_context_per_thread *pt = lws_container_of(sul,
|
|
struct lws_context_per_thread, sul_ah_lifecheck);
|
|
struct lws *wsi;
|
|
time_t now;
|
|
int m;
|
|
|
|
now = time(NULL);
|
|
|
|
lws_pt_lock(pt, __func__);
|
|
|
|
ah = pt->http.ah_list;
|
|
while (ah) {
|
|
int len;
|
|
char buf[256];
|
|
const unsigned char *c;
|
|
|
|
if (!ah->in_use || !ah->wsi || !ah->assigned ||
|
|
(ah->wsi->a.vhost &&
|
|
(now - ah->assigned) <
|
|
ah->wsi->a.vhost->timeout_secs_ah_idle + 360)) {
|
|
ah = ah->next;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* a single ah session somehow got held for
|
|
* an unreasonable amount of time.
|
|
*
|
|
* Dump info on the connection...
|
|
*/
|
|
wsi = ah->wsi;
|
|
buf[0] = '\0';
|
|
#if !defined(LWS_PLAT_OPTEE)
|
|
lws_get_peer_simple(wsi, buf, sizeof(buf));
|
|
#else
|
|
buf[0] = '\0';
|
|
#endif
|
|
lwsl_notice("ah excessive hold: wsi %p\n"
|
|
" peer address: %s\n"
|
|
" ah pos %lu\n",
|
|
wsi, buf, (unsigned long)ah->pos);
|
|
buf[0] = '\0';
|
|
m = 0;
|
|
do {
|
|
c = lws_token_to_string(m);
|
|
if (!c)
|
|
break;
|
|
if (!(*c))
|
|
break;
|
|
|
|
len = lws_hdr_total_length(wsi, m);
|
|
if (!len || len > (int)sizeof(buf) - 1) {
|
|
m++;
|
|
continue;
|
|
}
|
|
|
|
if (lws_hdr_copy(wsi, buf, sizeof buf, m) > 0) {
|
|
buf[sizeof(buf) - 1] = '\0';
|
|
|
|
lwsl_notice(" %s = %s\n",
|
|
(const char *)c, buf);
|
|
}
|
|
m++;
|
|
} while (1);
|
|
|
|
/* explicitly detach the ah */
|
|
lws_header_table_detach(wsi, 0);
|
|
|
|
/* ... and then drop the connection */
|
|
|
|
__lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS,
|
|
"excessive ah");
|
|
|
|
ah = pt->http.ah_list;
|
|
}
|
|
|
|
lws_pt_unlock(pt);
|
|
}
|
|
#endif
|