diff options
Diffstat (limited to '')
-rw-r--r-- | lib/nghttp2_alpn.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/lib/nghttp2_alpn.c b/lib/nghttp2_alpn.c new file mode 100644 index 0000000..33c5885 --- /dev/null +++ b/lib/nghttp2_alpn.c @@ -0,0 +1,70 @@ +/* + * nghttp2 - HTTP/2 C 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 "nghttp2_alpn.h" + +#include <string.h> + +static int select_alpn(const unsigned char **out, unsigned char *outlen, + const unsigned char *in, unsigned int inlen, + const char *key, unsigned int keylen) { + unsigned int i; + for (i = 0; i + keylen <= inlen; i += (unsigned int)(in[i] + 1)) { + if (memcmp(&in[i], key, keylen) == 0) { + *out = (unsigned char *)&in[i + 1]; + *outlen = in[i]; + return 0; + } + } + return -1; +} + +#define NGHTTP2_HTTP_1_1_ALPN "\x8http/1.1" +#define NGHTTP2_HTTP_1_1_ALPN_LEN (sizeof(NGHTTP2_HTTP_1_1_ALPN) - 1) + +int nghttp2_select_next_protocol(unsigned char **out, unsigned char *outlen, + const unsigned char *in, unsigned int inlen) { + if (select_alpn((const unsigned char **)out, outlen, in, inlen, + NGHTTP2_PROTO_ALPN, NGHTTP2_PROTO_ALPN_LEN) == 0) { + return 1; + } + if (select_alpn((const unsigned char **)out, outlen, in, inlen, + NGHTTP2_HTTP_1_1_ALPN, NGHTTP2_HTTP_1_1_ALPN_LEN) == 0) { + return 0; + } + return -1; +} + +int nghttp2_select_alpn(const unsigned char **out, unsigned char *outlen, + const unsigned char *in, unsigned int inlen) { + if (select_alpn(out, outlen, in, inlen, NGHTTP2_PROTO_ALPN, + NGHTTP2_PROTO_ALPN_LEN) == 0) { + return 1; + } + if (select_alpn(out, outlen, in, inlen, NGHTTP2_HTTP_1_1_ALPN, + NGHTTP2_HTTP_1_1_ALPN_LEN) == 0) { + return 0; + } + return -1; +} |