nghttp2/lib/spdylay_npn.c

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/*
* Spdylay - SPDY Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "spdylay_npn.h"
#include <string.h>
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typedef struct {
const unsigned char *proto;
uint8_t len;
uint16_t version;
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} spdylay_npn_proto;
int spdylay_select_next_protocol(unsigned char **out, unsigned char *outlen,
const unsigned char *in, unsigned int inlen)
{
int http_selected = 0;
unsigned int i = 0;
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static const spdylay_npn_proto proto_list[] = {
{ (const unsigned char*)"spdy/3", 6, SPDYLAY_PROTO_SPDY3 },
{ (const unsigned char*)"spdy/2", 6, SPDYLAY_PROTO_SPDY2 }
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};
for(; i < inlen; i += in[i]+1) {
unsigned int j;
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for(j = 0; j < sizeof(proto_list)/sizeof(spdylay_npn_proto); ++j) {
if(in[i] == proto_list[j].len &&
memcmp(&in[i+1], proto_list[j].proto, in[i]) == 0) {
*out = (unsigned char*)&in[i+1];
*outlen = in[i];
return proto_list[j].version;
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}
}
if(in[i] == 8 && memcmp(&in[i+1], "http/1.1", in[i]) == 0) {
http_selected = 1;
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*out = (unsigned char*)&in[i+1];
*outlen = in[i];
/* Go through to the next iteration, because "spdy/X" may be
there */
}
}
if(http_selected) {
return 0;
} else {
return -1;
}
}
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uint16_t spdylay_npn_get_version(const unsigned char *proto, size_t protolen)
{
if(proto == NULL) {
return 0;
} else {
if(protolen == 6) {
if(memcmp("spdy/2", proto, 6) == 0) {
return SPDYLAY_PROTO_SPDY2;
} else if(memcmp("spdy/3", proto, 6) == 0) {
return SPDYLAY_PROTO_SPDY3;
}
}
return 0;
}
}