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spdylay
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spdylay/lib/spdylay_frame.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_frame.h"
#include <arpa/inet.h>
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include "spdylay_helper.h"
static uint8_t spdylay_unpack_pri(const uint8_t *data)
{
return (data[0] >> 6) & 0x3;
}
static uint8_t* spdylay_pack_str(uint8_t *buf, const char *str, size_t len)
{
spdylay_put_uint16be(buf, len);
buf += 2;
memcpy(buf, str, len);
return buf+len;
}
static void spdylay_frame_pack_ctrl_hd(uint8_t* buf, const spdylay_ctrl_hd *hd)
{
spdylay_put_uint16be(&buf[0], hd->version);
buf[0] |= 1 << 7;
spdylay_put_uint16be(&buf[2], hd->type);
spdylay_put_uint32be(&buf[4], hd->length);
printf("hd->length=%d\n", hd->length);
buf[4] = hd->flags;
printf("hd->flags=%d\n", hd->flags);
}
static void spdylay_frame_unpack_ctrl_hd(spdylay_ctrl_hd *hd,
const uint8_t* buf)
{
hd->version = spdylay_get_uint16(buf) & 0x7fff;
hd->type = spdylay_get_uint16(buf+2);
hd->flags = buf[4];
hd->length = spdylay_get_uint32(buf+5) & 0xffffff;
}
static ssize_t spdylay_frame_alloc_pack_nv(uint8_t **buf_ptr,
char **nv, size_t nv_offset,
spdylay_zlib *deflater)
{
size_t nvbuflen = spdylay_frame_count_nv_space(nv);
uint8_t *nvbuf = malloc(nvbuflen);
size_t maxframelen = nv_offset+
spdylay_zlib_deflate_hd_bound(deflater, nvbuflen);
uint8_t *framebuf = malloc(maxframelen);
ssize_t framelen;
spdylay_frame_pack_nv(nvbuf, nv);
framelen = spdylay_zlib_deflate_hd(deflater, framebuf+18, maxframelen-18,
nvbuf, nvbuflen);
free(nvbuf);
if(framelen < 0) {
free(framebuf);
return framelen;
}
framelen += 18;
*buf_ptr = framebuf;
return framelen;
}
int spdylay_frame_unpack_nv(char ***nv_ptr, const uint8_t *in, size_t inlen)
{
int r = 0;
uint16_t n;
size_t off;
size_t nv_max = 126;
int i, j, k;
char *name = NULL, *val = NULL;
if(inlen < 2) {
return SPDYLAY_ERR_PROTO;
}
memcpy(&n, in, sizeof(uint16_t));
n = ntohs(n);
if(n > nv_max) {
nv_max = n;
}
*nv_ptr = malloc(nv_max*sizeof(char*)+1);
if(*nv_ptr == NULL) {
return SPDYLAY_ERR_NOMEM;
}
off = 2;
for(i = 0, j = 0; i < n; ++i) {
uint16_t nlen, vlen;
size_t last, len;
if(off+2 > inlen) {
r = SPDYLAY_ERR_PROTO;
break;
}
/* For NULL delimited values, they are splitted with each name */
memcpy(&nlen, &in[off], sizeof(uint16_t));
nlen = ntohs(nlen);
off += 2;
if(off+nlen > inlen || nlen == 0) {
r = SPDYLAY_ERR_PROTO;
break;
}
name = malloc(nlen+1);
if(name == NULL) {
r = SPDYLAY_ERR_NOMEM;
break;
}
memcpy(name, &in[off], nlen);
name[nlen] = '\0';
off += nlen;
if(off+2 > inlen) {
r = SPDYLAY_ERR_PROTO;
break;
}
memcpy(&vlen, &in[off], sizeof(uint16_t));
vlen = ntohs(vlen);
off += 2;
if(off+vlen > inlen) {
r = SPDYLAY_ERR_PROTO;
break;
}
for(k = 0, last = off; k < vlen; ++k) {
size_t len;
if(in[off+k] == '\0') {
len = off+k-last;
if(len == 0) {
r = SPDYLAY_ERR_PROTO;
break;
}
val = malloc(len+1);
if(val == NULL) {
r = SPDYLAY_ERR_NOMEM;
break;
}
memcpy(val, &in[last], len);
val[len] = '\0';
if(j >= nv_max) {
char **nnv;
nv_max *= 2;
nnv = realloc(*nv_ptr, nv_max+1);
if(nnv == NULL) {
r = SPDYLAY_ERR_NOMEM;
break;
} else {
*nv_ptr = nnv;
}
}
(*nv_ptr)[j] = strdup(name);
(*nv_ptr)[j+1] = val;
val = NULL;
last = off+k+1;
j += 2;
}
}
if(r != 0) {
break;
}
len = vlen-(last-off);
if(len == 0) {
r = SPDYLAY_ERR_PROTO;
break;
}
val = malloc(len+1);
if(val == NULL) {
free(name);
r = SPDYLAY_ERR_NOMEM;
break;
}
memcpy(val, &in[last], len);
val[len] = '\0';
if(j >= nv_max) {
char **nnv;
nv_max *= 2;
nnv = realloc(*nv_ptr, nv_max+1);
if(nnv == NULL) {
r = SPDYLAY_ERR_NOMEM;
break;
} else {
*nv_ptr = nnv;
}
}
(*nv_ptr)[j] = name;
(*nv_ptr)[j+1] = val;
name = val = NULL;
j += 2;
off += vlen;
}
free(name);
free(val);
if(r == 0) {
(*nv_ptr)[j] = NULL;
} else {
for(i = 0; i < j; ++i) {
free((*nv_ptr)[i]);
}
free(*nv_ptr);
}
return r;
}
static int spdylay_frame_alloc_unpack_nv(char ***nv_ptr,
const uint8_t *in, size_t inlen,
spdylay_zlib *inflater)
{
ssize_t r;
spdylay_buffer outbuffer;
spdylay_buffer_init(&outbuffer, 4096);
r = spdylay_zlib_inflate_hd(inflater, &outbuffer, in, inlen);
if(r < 0) {
spdylay_buffer_free(&outbuffer);
return r;
} else {
uint8_t *buf = malloc(r);
if(buf == NULL) {
spdylay_buffer_free(&outbuffer);
return SPDYLAY_ERR_NOMEM;
}
spdylay_buffer_serialize(&outbuffer, buf);
spdylay_buffer_free(&outbuffer);
r = spdylay_frame_unpack_nv(nv_ptr, buf, r);
free(buf);
return r;
}
}
size_t spdylay_frame_count_nv_space(char **nv)
{
size_t sum = 2;
int i;
const char *prev = "";
size_t prevlen = 0;
for(i = 0; nv[i]; i += 2) {
const char *key = nv[i];
const char *val = nv[i+1];
size_t keylen = strlen(key);
size_t vallen = strlen(val);
if(prevlen == keylen && memcmp(prev, key, keylen) == 0) {
/* Join previous value, with NULL character */
sum += vallen+1;
} else {
prev = key;
/* SPDY NV header does not include terminating NULL byte */
sum += keylen+vallen+4;
}
}
return sum;
}
ssize_t spdylay_frame_pack_nv(uint8_t *buf, char **nv)
{
int i;
uint8_t *bufp = buf+2;
uint16_t num_nv = 0;
/* TODO Join values with same keys, using '\0' as a delimiter */
const char *prev = "";
uint8_t *prev_vallen_buf = NULL;
uint16_t prev_vallen = 0;
for(i = 0; nv[i]; i += 2) {
const char *key = nv[i];
const char *val = nv[i+1];
size_t keylen = strlen(key);
size_t vallen = strlen(val);
if(strcmp(prev, key) == 0) {
prev_vallen += vallen+1;
spdylay_put_uint16be(prev_vallen_buf, prev_vallen);
*bufp = '\0';
++bufp;
memcpy(bufp, val, vallen);
bufp += vallen;
} else {
++num_nv;
bufp = spdylay_pack_str(bufp, key, keylen);
prev = key;
prev_vallen_buf = bufp;
prev_vallen = vallen;
bufp = spdylay_pack_str(bufp, val, vallen);
}
}
spdylay_put_uint16be(buf, num_nv);
return bufp-buf;
}
int spdylay_frame_is_ctrl_frame(uint8_t first_byte)
{
return first_byte & 0x80;
}
void spdylay_frame_nv_free(char **nv)
{
int i;
for(i = 0; nv[i]; i += 2) {
free(nv[i]);
free(nv[i+1]);
}
}
void spdylay_frame_syn_stream_init(spdylay_syn_stream *frame, uint8_t flags,
int32_t stream_id, int32_t assoc_stream_id,
uint8_t pri, char **nv)
{
memset(frame, 0, sizeof(spdylay_syn_stream));
frame->hd.version = 2;
frame->hd.type = SPDYLAY_SYN_STREAM;
frame->hd.flags = flags;
frame->stream_id = stream_id;
frame->assoc_stream_id = assoc_stream_id;
frame->pri = pri;
frame->nv = nv;
}
void spdylay_frame_syn_stream_free(spdylay_syn_stream *frame)
{
spdylay_frame_nv_free(frame->nv);
free(frame->nv);
}
void spdylay_frame_syn_reply_free(spdylay_syn_reply *frame)
{
spdylay_frame_nv_free(frame->nv);
free(frame->nv);
}
ssize_t spdylay_frame_pack_syn_stream(uint8_t **buf_ptr,
spdylay_syn_stream *frame,
spdylay_zlib *deflater)
{
uint8_t *framebuf = NULL;
size_t framelen;
framelen = spdylay_frame_alloc_pack_nv(&framebuf, frame->nv, 18, deflater);
if(framelen < 0) {
return framelen;
}
frame->hd.length = framelen-8;
memset(framebuf, 0, 18);
/* pack ctrl header after length is determined */
spdylay_frame_pack_ctrl_hd(framebuf, &frame->hd);
spdylay_put_uint32be(&framebuf[8], frame->stream_id);
spdylay_put_uint32be(&framebuf[12], frame->assoc_stream_id);
framebuf[16] = (frame->pri << 6);
*buf_ptr = framebuf;
return framelen;
}
int spdylay_frame_unpack_syn_stream(spdylay_syn_stream *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen,
spdylay_zlib *inflater)
{
int r;
spdylay_frame_unpack_ctrl_hd(&frame->hd, head);
frame->stream_id = spdylay_get_uint32(payload);
frame->assoc_stream_id = spdylay_get_uint32(payload+4);
frame->pri = spdylay_unpack_pri(payload+8);
r = spdylay_frame_alloc_unpack_nv(&frame->nv, payload+10, payloadlen-10,
inflater);
return r;
}
int spdylay_frame_unpack_syn_reply(spdylay_syn_reply *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen,
spdylay_zlib *inflater)
{
int r;
spdylay_frame_unpack_ctrl_hd(&frame->hd, head);
frame->stream_id = spdylay_get_uint32(payload);
r = spdylay_frame_alloc_unpack_nv(&frame->nv, payload+6, payloadlen-6,
inflater);
return r;
}
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