8368249907
Gets the ALPN list the same way DoH does. Needs c-ares 1.28.0 or later. Thanks-to: Brad House Closes #16039
89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#ifdef USE_HTTPSRR
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#include "urldata.h"
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#include "curl_addrinfo.h"
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#include "httpsrr.h"
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#include "connect.h"
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CURLcode Curl_httpsrr_decode_alpn(const unsigned char *cp, size_t len,
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unsigned char *alpns)
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{
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/*
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* spec here is as per RFC 9460, section-7.1.1
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* encoding is a concatenated list of strings each preceded by a one
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* octet length
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* output is comma-sep list of the strings
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* implementations may or may not handle quoting of comma within
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* string values, so we might see a comma within the wire format
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* version of a string, in which case we will precede that by a
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* backslash - same goes for a backslash character, and of course
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* we need to use two backslashes in strings when we mean one;-)
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*/
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struct dynbuf dval;
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int idnum = 0;
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Curl_dyn_init(&dval, DYN_DOH_RESPONSE);
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while(len > 0) {
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size_t tlen = (size_t) *cp++;
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size_t i;
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enum alpnid id;
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len--;
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if(tlen > len)
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goto err;
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/* add escape char if needed, clunky but easier to read */
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for(i = 0; i != tlen; i++) {
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if('\\' == *cp || ',' == *cp) {
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if(Curl_dyn_addn(&dval, "\\", 1))
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goto err;
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}
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if(Curl_dyn_addn(&dval, cp++, 1))
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goto err;
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}
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len -= tlen;
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/* we only store ALPN ids we know about */
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id = Curl_alpn2alpnid(Curl_dyn_ptr(&dval), Curl_dyn_len(&dval));
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if(id != ALPN_none) {
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if(idnum == MAX_HTTPSRR_ALPNS)
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break;
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alpns[idnum++] = (unsigned char)id;
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}
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Curl_dyn_reset(&dval);
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}
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Curl_dyn_free(&dval);
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if(idnum < MAX_HTTPSRR_ALPNS)
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alpns[idnum] = ALPN_none; /* terminate the list */
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return CURLE_OK;
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err:
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Curl_dyn_free(&dval);
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return CURLE_BAD_CONTENT_ENCODING;
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}
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#endif
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