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nghttp2/lib/nghttp2_frame.c

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/*
* nghttp2 - HTTP/2.0 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_frame.h"
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include <errno.h>
#include "nghttp2_helper.h"
#include "nghttp2_net.h"
size_t nghttp2_frame_get_len_size(uint16_t version)
{
if(NGHTTP2_PROTO_SPDY2 == version) {
return 2;
} else if(NGHTTP2_PROTO_SPDY3 == version) {
return 4;
} else {
/* Unsupported version */
return 0;
}
}
static uint8_t* nghttp2_pack_str(uint8_t *buf, const char *str, size_t len,
size_t len_size)
{
nghttp2_frame_put_nv_len(buf, len, len_size);
buf += len_size;
memcpy(buf, str, len);
return buf+len;
}
static void nghttp2_frame_pack_ctrl_hd(uint8_t* buf, const nghttp2_ctrl_hd *hd)
{
nghttp2_put_uint16be(&buf[0], hd->version);
buf[0] |= 1 << 7;
nghttp2_put_uint16be(&buf[2], hd->type);
nghttp2_put_uint32be(&buf[4], hd->length);
buf[4] = hd->flags;
}
static void nghttp2_frame_unpack_ctrl_hd(nghttp2_ctrl_hd *hd,
const uint8_t* buf)
{
hd->version = nghttp2_get_uint16(buf) & NGHTTP2_VERSION_MASK;
hd->type = nghttp2_get_uint16(&buf[2]);
hd->flags = buf[4];
hd->length = nghttp2_get_uint32(&buf[4]) & NGHTTP2_LENGTH_MASK;
}
ssize_t nghttp2_frame_alloc_pack_nv(uint8_t **buf_ptr,
size_t *buflen_ptr,
uint8_t **nvbuf_ptr,
size_t *nvbuflen_ptr,
char **nv, size_t nv_offset,
size_t len_size,
nghttp2_zlib *deflater)
{
size_t nvspace;
size_t maxframelen;
ssize_t framelen;
int r;
nvspace = nghttp2_frame_count_nv_space(nv, len_size);
r = nghttp2_reserve_buffer(nvbuf_ptr, nvbuflen_ptr, nvspace);
if(r != 0) {
return NGHTTP2_ERR_NOMEM;
}
maxframelen = nv_offset+nghttp2_zlib_deflate_hd_bound(deflater, nvspace);
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, maxframelen);
if(r != 0) {
return NGHTTP2_ERR_NOMEM;
}
nghttp2_frame_pack_nv(*nvbuf_ptr, nv, len_size);
framelen = nghttp2_zlib_deflate_hd(deflater,
(*buf_ptr)+nv_offset,
maxframelen-nv_offset,
*nvbuf_ptr, nvspace);
if(framelen < 0) {
return framelen;
}
framelen += nv_offset;
if(framelen - NGHTTP2_FRAME_HEAD_LENGTH > NGHTTP2_LENGTH_MASK) {
/* In SPDY/2 and 3, Max frame size is 2**24 - 1. */
return NGHTTP2_ERR_FRAME_TOO_LARGE;
}
return framelen;
}
int nghttp2_frame_count_unpack_nv_space(size_t *nvlen_ptr, size_t *buflen_ptr,
nghttp2_buffer *in, size_t len_size)
{
uint32_t n;
size_t buflen = 0;
size_t nvlen = 0;
size_t off = 0;
size_t inlen = nghttp2_buffer_length(in);
size_t i;
nghttp2_buffer_reader reader;
if(inlen < len_size) {
return NGHTTP2_ERR_INVALID_FRAME;
}
nghttp2_buffer_reader_init(&reader, in);
/* TODO limit n in a reasonable number */
n = nghttp2_frame_get_nv_len(&reader, len_size);
off += len_size;
for(i = 0; i < n; ++i) {
uint32_t len;
size_t j;
for(j = 0; j < 2; ++j) {
if(inlen-off < len_size) {
return NGHTTP2_ERR_INVALID_FRAME;
}
len = nghttp2_frame_get_nv_len(&reader, len_size);
off += len_size;
if(inlen-off < len) {
return NGHTTP2_ERR_INVALID_FRAME;
}
buflen += len+1;
off += len;
if(j == 0) {
nghttp2_buffer_reader_advance(&reader, len);
}
}
nvlen += nghttp2_buffer_reader_count(&reader, len, '\0');
++nvlen;
}
if(inlen == off) {
*nvlen_ptr = nvlen;
*buflen_ptr = buflen+(nvlen*2+1)*sizeof(char*);
return 0;
} else {
return NGHTTP2_ERR_INVALID_FRAME;
}
}
int nghttp2_frame_unpack_nv(char ***nv_ptr, nghttp2_buffer *in,
size_t len_size)
{
size_t nvlen, buflen;
int r;
size_t i;
char *buf, **idx, *data;
uint32_t n;
int invalid_header_block = 0;
nghttp2_buffer_reader reader;
r = nghttp2_frame_count_unpack_nv_space(&nvlen, &buflen, in, len_size);
if(r != 0) {
return r;
}
buf = malloc(buflen);
if(buf == NULL) {
return NGHTTP2_ERR_NOMEM;
}
nghttp2_buffer_reader_init(&reader, in);
idx = (char**)buf;
data = buf+(nvlen*2+1)*sizeof(char*);
n = nghttp2_frame_get_nv_len(&reader, len_size);
for(i = 0; i < n; ++i) {
uint32_t len;
char *name, *val;
char *stop;
int multival;
len = nghttp2_frame_get_nv_len(&reader, len_size);
if(len == 0) {
invalid_header_block = 1;
}
name = data;
nghttp2_buffer_reader_data(&reader, (uint8_t*)data, len);
for(stop = data+len; data != stop; ++data) {
unsigned char c = *data;
if(c < 0x20 || c > 0x7e || ('A' <= c && c <= 'Z')) {
invalid_header_block = 1;
}
}
*data = '\0';
++data;
len = nghttp2_frame_get_nv_len(&reader, len_size);
val = data;
nghttp2_buffer_reader_data(&reader, (uint8_t*)data, len);
multival = 0;
for(stop = data+len; data != stop; ++data) {
if(*data == '\0') {
*idx++ = name;
*idx++ = val;
if(val == data) {
invalid_header_block = 1;
}
val = data+1;
multival = 1;
}
}
*data = '\0';
/* Check last header value is empty if NULL separator was
found. */
if(multival && val == data) {
invalid_header_block = 1;
}
++data;
*idx++ = name;
*idx++ = val;
}
*idx = NULL;
assert((size_t)((char*)idx - buf) == (nvlen*2)*sizeof(char*));
*nv_ptr = (char**)buf;
if(!invalid_header_block) {
nghttp2_frame_nv_sort(*nv_ptr);
for(i = 2; i < nvlen*2; i += 2) {
if(strcmp((*nv_ptr)[i-2], (*nv_ptr)[i]) == 0 &&
(*nv_ptr)[i-2] != (*nv_ptr)[i]) {
invalid_header_block = 1;
break;
}
}
}
return invalid_header_block ? NGHTTP2_ERR_INVALID_HEADER_BLOCK : 0;
}
size_t nghttp2_frame_count_nv_space(char **nv, size_t len_size)
{
size_t sum = len_size;
int i;
const char *prev = "";
size_t prevlen = 0;
size_t prevvallen = 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) {
if(vallen) {
if(prevvallen) {
/* Join previous value, with NULL character */
sum += vallen+1;
prevvallen = vallen;
} else {
/* Previous value is empty. In this case, drop the
previous. */
sum += vallen;
}
}
} else {
prev = key;
prevlen = keylen;
prevvallen = vallen;
/* SPDY NV header does not include terminating NULL byte */
sum += keylen+vallen+len_size*2;
}
}
return sum;
}
ssize_t nghttp2_frame_pack_nv(uint8_t *buf, char **nv, size_t len_size)
{
int i;
uint8_t *bufp = buf+len_size;
uint32_t num_nv = 0;
const char *prev = "";
uint8_t *cur_vallen_buf = NULL;
uint32_t cur_vallen = 0;
size_t prevkeylen = 0;
size_t prevvallen = 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(prevkeylen == keylen && memcmp(prev, key, keylen) == 0) {
if(vallen) {
if(prevvallen) {
/* Join previous value, with NULL character */
cur_vallen += vallen+1;
nghttp2_frame_put_nv_len(cur_vallen_buf, cur_vallen, len_size);
*bufp = '\0';
++bufp;
memcpy(bufp, val, vallen);
bufp += vallen;
} else {
/* Previous value is empty. In this case, drop the
previous. */
cur_vallen += vallen;
nghttp2_frame_put_nv_len(cur_vallen_buf, cur_vallen, len_size);
memcpy(bufp, val, vallen);
bufp += vallen;
}
}
} else {
++num_nv;
bufp = nghttp2_pack_str(bufp, key, keylen, len_size);
prev = key;
cur_vallen_buf = bufp;
cur_vallen = vallen;
prevkeylen = keylen;
prevvallen = vallen;
bufp = nghttp2_pack_str(bufp, val, vallen, len_size);
}
}
nghttp2_frame_put_nv_len(buf, num_nv, len_size);
return bufp-buf;
}
int nghttp2_frame_is_ctrl_frame(uint8_t first_byte)
{
return first_byte & 0x80;
}
void nghttp2_frame_nv_del(char **nv)
{
free(nv);
}
char** nghttp2_frame_nv_copy(const char **nv)
{
int i;
char *buf;
char **idx, *data;
size_t buflen = 0;
for(i = 0; nv[i]; ++i) {
buflen += strlen(nv[i])+1;
}
buflen += (i+1)*sizeof(char*);
buf = malloc(buflen);
if(buf == NULL) {
return NULL;
}
idx = (char**)buf;
data = buf+(i+1)*sizeof(char*);
for(i = 0; nv[i]; ++i) {
size_t len = strlen(nv[i])+1;
memcpy(data, nv[i], len);
*idx++ = data;
data += len;
}
*idx = NULL;
return (char**)buf;
}
static int nghttp2_string_compar(const void *lhs, const void *rhs)
{
return strcmp(*(char **)lhs, *(char **)rhs);
}
void nghttp2_frame_nv_sort(char **nv)
{
int n;
for(n = 0; nv[n]; ++n);
qsort(nv, n/2, 2*sizeof(char*), nghttp2_string_compar);
}
void nghttp2_frame_nv_downcase(char **nv)
{
int i, j;
for(i = 0; nv[i]; i += 2) {
for(j = 0; nv[i][j] != '\0'; ++j) {
if('A' <= nv[i][j] && nv[i][j] <= 'Z') {
nv[i][j] += 'a'-'A';
}
}
}
}
char** nghttp2_frame_nv_norm_copy(const char **nv)
{
char **nv_copy;
nv_copy = nghttp2_frame_nv_copy(nv);
if(nv_copy != NULL) {
nghttp2_frame_nv_downcase(nv_copy);
nghttp2_frame_nv_sort(nv_copy);
}
return nv_copy;
}
/* Table to translate SPDY/3 header names to SPDY/2. */
static const char *nghttp2_nv_3to2[] = {
":host", "host",
":method", "method",
":path", "url",
":scheme", "scheme",
":status", "status",
":version", "version",
NULL
};
void nghttp2_frame_nv_3to2(char **nv)
{
int i, j;
for(i = 0; nv[i]; i += 2) {
for(j = 0; nghttp2_nv_3to2[j]; j += 2) {
if(strcmp(nv[i], nghttp2_nv_3to2[j]) == 0) {
nv[i] = (char*)nghttp2_nv_3to2[j+1];
break;
}
}
}
}
void nghttp2_frame_nv_2to3(char **nv)
{
int i, j;
for(i = 0; nv[i]; i += 2) {
for(j = 0; nghttp2_nv_3to2[j]; j += 2) {
if(strcmp(nv[i], nghttp2_nv_3to2[j+1]) == 0) {
nv[i] = (char*)nghttp2_nv_3to2[j];
break;
}
}
}
}
#define NGHTTP2_HTTPS_PORT 443
int nghttp2_frame_nv_set_origin(char **nv, nghttp2_origin *origin)
{
int scheme_found, host_found;
int i;
scheme_found = host_found = 0;
for(i = 0; nv[i]; i += 2) {
if(scheme_found == 0 && strcmp(":scheme", nv[i]) == 0) {
size_t len = strlen(nv[i+1]);
if(len <= NGHTTP2_MAX_SCHEME) {
strcpy(origin->scheme, nv[i+1]);
scheme_found = 1;
}
} else if(host_found == 0 && strcmp(":host", nv[i]) == 0) {
size_t len = strlen(nv[i+1]);
char *sep = memchr(nv[i+1], ':', len);
size_t hostlen;
if(sep == NULL) {
origin->port = NGHTTP2_HTTPS_PORT;
sep = nv[i+1]+len;
} else {
unsigned long int port;
errno = 0;
port = strtoul(sep+1, NULL, 10);
if(errno != 0 || port == 0 || port > UINT16_MAX) {
continue;
}
origin->port = port;
}
hostlen = sep-nv[i+1];
if(hostlen > NGHTTP2_MAX_HOSTNAME) {
continue;
}
memcpy(origin->host, nv[i+1], hostlen);
origin->host[hostlen] = '\0';
host_found = 1;
}
}
if(scheme_found && host_found) {
return 0;
} else {
return NGHTTP2_ERR_INVALID_ARGUMENT;
}
}
void nghttp2_frame_syn_stream_init(nghttp2_syn_stream *frame,
uint16_t version, uint8_t flags,
int32_t stream_id, int32_t assoc_stream_id,
uint8_t pri, char **nv)
{
memset(frame, 0, sizeof(nghttp2_syn_stream));
frame->hd.version = version;
frame->hd.type = NGHTTP2_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 nghttp2_frame_syn_stream_free(nghttp2_syn_stream *frame)
{
nghttp2_frame_nv_del(frame->nv);
}
void nghttp2_frame_syn_reply_init(nghttp2_syn_reply *frame,
uint16_t version, uint8_t flags,
int32_t stream_id, char **nv)
{
memset(frame, 0, sizeof(nghttp2_syn_reply));
frame->hd.version = version;
frame->hd.type = NGHTTP2_SYN_REPLY;
frame->hd.flags = flags;
frame->stream_id = stream_id;
frame->nv = nv;
}
void nghttp2_frame_syn_reply_free(nghttp2_syn_reply *frame)
{
nghttp2_frame_nv_del(frame->nv);
}
void nghttp2_frame_ping_init(nghttp2_ping *frame,
uint16_t version, uint32_t unique_id)
{
memset(frame, 0, sizeof(nghttp2_ping));
frame->hd.version = version;
frame->hd.type = NGHTTP2_PING;
frame->hd.flags = NGHTTP2_CTRL_FLAG_NONE;
frame->hd.length = 4;
frame->unique_id = unique_id;
}
void nghttp2_frame_ping_free(nghttp2_ping *frame)
{}
void nghttp2_frame_goaway_init(nghttp2_goaway *frame,
uint16_t version, int32_t last_good_stream_id,
uint32_t status_code)
{
memset(frame, 0, sizeof(nghttp2_goaway));
frame->hd.version = version;
frame->hd.type = NGHTTP2_GOAWAY;
if(version == NGHTTP2_PROTO_SPDY2) {
frame->hd.length = 4;
} else if(version == NGHTTP2_PROTO_SPDY3) {
frame->hd.length = 8;
frame->status_code = status_code;
} else {
frame->hd.length = 0;
}
frame->last_good_stream_id = last_good_stream_id;
}
void nghttp2_frame_goaway_free(nghttp2_goaway *frame)
{}
void nghttp2_frame_headers_init(nghttp2_headers *frame,
uint16_t version, uint8_t flags,
int32_t stream_id, char **nv)
{
memset(frame, 0, sizeof(nghttp2_headers));
frame->hd.version = version;
frame->hd.type = NGHTTP2_HEADERS;
frame->hd.flags = flags;
frame->stream_id = stream_id;
frame->nv = nv;
}
void nghttp2_frame_headers_free(nghttp2_headers *frame)
{
nghttp2_frame_nv_del(frame->nv);
}
void nghttp2_frame_rst_stream_init(nghttp2_rst_stream *frame,
uint16_t version,
int32_t stream_id, uint32_t status_code)
{
memset(frame, 0, sizeof(nghttp2_rst_stream));
frame->hd.version = version;
frame->hd.type = NGHTTP2_RST_STREAM;
frame->hd.flags = 0;
frame->hd.length = 8;
frame->stream_id = stream_id;
frame->status_code = status_code;
}
void nghttp2_frame_rst_stream_free(nghttp2_rst_stream *frame)
{}
void nghttp2_frame_window_update_init(nghttp2_window_update *frame,
uint16_t version,
int32_t stream_id,
int32_t delta_window_size)
{
memset(frame, 0, sizeof(nghttp2_window_update));
frame->hd.version = version;
frame->hd.type = NGHTTP2_WINDOW_UPDATE;
frame->hd.flags = 0;
frame->hd.length = 8;
frame->stream_id = stream_id;
frame->delta_window_size = delta_window_size;
}
void nghttp2_frame_window_update_free(nghttp2_window_update *frame)
{}
void nghttp2_frame_settings_init(nghttp2_settings *frame,
uint16_t version, uint8_t flags,
nghttp2_settings_entry *iv, size_t niv)
{
memset(frame, 0, sizeof(nghttp2_settings));
frame->hd.version = version;
frame->hd.type = NGHTTP2_SETTINGS;
frame->hd.flags = flags;
frame->hd.length = 4+niv*8;
frame->niv = niv;
frame->iv = iv;
}
void nghttp2_frame_settings_free(nghttp2_settings *frame)
{
free(frame->iv);
}
void nghttp2_frame_credential_init(nghttp2_credential *frame,
uint16_t version, uint16_t slot,
nghttp2_mem_chunk *proof,
nghttp2_mem_chunk *certs,
size_t ncerts)
{
size_t i;
memset(frame, 0, sizeof(nghttp2_credential));
frame->hd.version = version;
frame->hd.type = NGHTTP2_CREDENTIAL;
frame->slot = slot;
frame->proof = *proof;
frame->certs = certs;
frame->ncerts = ncerts;
frame->hd.length = 2+4+frame->proof.length;
for(i = 0; i < ncerts; ++i) {
frame->hd.length += 4+frame->certs[i].length;
}
}
void nghttp2_frame_credential_free(nghttp2_credential *frame)
{
size_t i;
free(frame->proof.data);
for(i = 0; i < frame->ncerts; ++i) {
free(frame->certs[i].data);
}
free(frame->certs);
}
void nghttp2_frame_data_init(nghttp2_data *frame, int32_t stream_id,
uint8_t flags,
const nghttp2_data_provider *data_prd)
{
memset(frame, 0, sizeof(nghttp2_data));
frame->stream_id = stream_id;
frame->flags = flags;
frame->data_prd = *data_prd;
}
void nghttp2_frame_data_free(nghttp2_data *frame)
{}
ssize_t nghttp2_frame_pack_syn_stream(uint8_t **buf_ptr,
size_t *buflen_ptr,
uint8_t **nvbuf_ptr,
size_t *nvbuflen_ptr,
nghttp2_syn_stream *frame,
nghttp2_zlib *deflater)
{
ssize_t framelen;
size_t len_size = nghttp2_frame_get_len_size(frame->hd.version);
if(len_size == 0) {
return NGHTTP2_ERR_UNSUPPORTED_VERSION;
}
framelen = nghttp2_frame_alloc_pack_nv(buf_ptr, buflen_ptr,
nvbuf_ptr, nvbuflen_ptr,
frame->nv,
NGHTTP2_SYN_STREAM_NV_OFFSET,
len_size,
deflater);
if(framelen < 0) {
return framelen;
}
frame->hd.length = framelen-NGHTTP2_FRAME_HEAD_LENGTH;
memset(*buf_ptr, 0, NGHTTP2_SYN_STREAM_NV_OFFSET);
/* pack ctrl header after length is determined */
nghttp2_frame_pack_ctrl_hd(*buf_ptr, &frame->hd);
nghttp2_put_uint32be(&(*buf_ptr)[8], frame->stream_id);
nghttp2_put_uint32be(&(*buf_ptr)[12], frame->assoc_stream_id);
if(frame->hd.version == NGHTTP2_PROTO_SPDY3) {
(*buf_ptr)[16] = (frame->pri << 5);
(*buf_ptr)[17] = frame->slot;
} else {
(*buf_ptr)[16] = (frame->pri << 6);
}
return framelen;
}
int nghttp2_frame_unpack_syn_stream(nghttp2_syn_stream *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen,
nghttp2_buffer *inflatebuf)
{
int r;
size_t len_size;
r = nghttp2_frame_unpack_syn_stream_without_nv(frame, head, headlen,
payload, payloadlen);
len_size = nghttp2_frame_get_len_size(frame->hd.version);
if(len_size == 0) {
return NGHTTP2_ERR_UNSUPPORTED_VERSION;
}
if(r == 0) {
r = nghttp2_frame_unpack_nv(&frame->nv, inflatebuf, len_size);
}
return r;
}
int nghttp2_frame_unpack_syn_stream_without_nv(nghttp2_syn_stream *frame,
const uint8_t *head,
size_t headlen,
const uint8_t *payload,
size_t payloadlen)
{
nghttp2_frame_unpack_ctrl_hd(&frame->hd, head);
if(headlen + payloadlen != NGHTTP2_SYN_STREAM_NV_OFFSET) {
return NGHTTP2_ERR_INVALID_FRAME;
}
frame->stream_id = nghttp2_get_uint32(payload) & NGHTTP2_STREAM_ID_MASK;
frame->assoc_stream_id =
nghttp2_get_uint32(payload+4) & NGHTTP2_STREAM_ID_MASK;
if(frame->hd.version == NGHTTP2_PROTO_SPDY3) {
frame->pri = (*(payload+8) >> 5);
frame->slot = payload[9];
} else {
frame->pri = (*(payload+8) >> 6);
frame->slot = 0;
}
frame->nv = NULL;
return 0;
}
ssize_t nghttp2_frame_pack_syn_reply(uint8_t **buf_ptr,
size_t *buflen_ptr,
uint8_t **nvbuf_ptr,
size_t *nvbuflen_ptr,
nghttp2_syn_reply *frame,
nghttp2_zlib *deflater)
{
ssize_t framelen;
size_t len_size;
ssize_t nv_offset;
len_size = nghttp2_frame_get_len_size(frame->hd.version);
if(len_size == 0) {
return NGHTTP2_ERR_UNSUPPORTED_VERSION;
}
nv_offset = nghttp2_frame_nv_offset(NGHTTP2_SYN_REPLY, frame->hd.version);
assert(nv_offset > 0);
framelen = nghttp2_frame_alloc_pack_nv(buf_ptr, buflen_ptr,
nvbuf_ptr, nvbuflen_ptr,
frame->nv, nv_offset,
len_size, deflater);
if(framelen < 0) {
return framelen;
}
frame->hd.length = framelen-NGHTTP2_FRAME_HEAD_LENGTH;
memset(*buf_ptr, 0, nv_offset);
nghttp2_frame_pack_ctrl_hd(*buf_ptr, &frame->hd);
nghttp2_put_uint32be(&(*buf_ptr)[8], frame->stream_id);
return framelen;
}
int nghttp2_frame_unpack_syn_reply(nghttp2_syn_reply *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen,
nghttp2_buffer *inflatebuf)
{
int r;
r = nghttp2_frame_unpack_syn_reply_without_nv(frame, head, headlen,
payload, payloadlen);
if(r == 0) {
size_t len_size;
len_size = nghttp2_frame_get_len_size(frame->hd.version);
if(len_size == 0) {
return NGHTTP2_ERR_UNSUPPORTED_VERSION;
}
r = nghttp2_frame_unpack_nv(&frame->nv, inflatebuf, len_size);
}
return r;
}
int nghttp2_frame_unpack_syn_reply_without_nv(nghttp2_syn_reply *frame,
const uint8_t *head,
size_t headlen,
const uint8_t *payload,
size_t payloadlen)
{
ssize_t nv_offset;
nghttp2_frame_unpack_ctrl_hd(&frame->hd, head);
nv_offset = nghttp2_frame_nv_offset(NGHTTP2_SYN_REPLY, frame->hd.version);
assert(nv_offset > 0);
if((ssize_t)(headlen + payloadlen) != nv_offset) {
return NGHTTP2_ERR_INVALID_FRAME;
}
frame->stream_id = nghttp2_get_uint32(payload) & NGHTTP2_STREAM_ID_MASK;
frame->nv = NULL;
return 0;
}
ssize_t nghttp2_frame_pack_ping(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_ping *frame)
{
ssize_t framelen = 12;
int r;
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, framelen);
if(r != 0) {
return r;
}
memset(*buf_ptr, 0, framelen);
nghttp2_frame_pack_ctrl_hd(*buf_ptr, &frame->hd);
nghttp2_put_uint32be(&(*buf_ptr)[8], frame->unique_id);
return framelen;
}
int nghttp2_frame_unpack_ping(nghttp2_ping *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen)
{
if(payloadlen != 4) {
return NGHTTP2_ERR_INVALID_FRAME;
}
nghttp2_frame_unpack_ctrl_hd(&frame->hd, head);
frame->unique_id = nghttp2_get_uint32(payload);
return 0;
}
ssize_t nghttp2_frame_pack_goaway(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_goaway *frame)
{
ssize_t framelen;
int r;
if(frame->hd.version == NGHTTP2_PROTO_SPDY2) {
framelen = 12;
} else if(frame->hd.version == NGHTTP2_PROTO_SPDY3) {
framelen = 16;
} else {
return NGHTTP2_ERR_UNSUPPORTED_VERSION;
}
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, framelen);
if(r != 0) {
return r;
}
memset(*buf_ptr, 0, framelen);
nghttp2_frame_pack_ctrl_hd(*buf_ptr, &frame->hd);
nghttp2_put_uint32be(&(*buf_ptr)[8], frame->last_good_stream_id);
if(frame->hd.version == NGHTTP2_PROTO_SPDY3) {
nghttp2_put_uint32be(&(*buf_ptr)[12], frame->status_code);
}
return framelen;
}
int nghttp2_frame_unpack_goaway(nghttp2_goaway *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen)
{
nghttp2_frame_unpack_ctrl_hd(&frame->hd, head);
if(frame->hd.version == NGHTTP2_PROTO_SPDY2) {
if(payloadlen != 4) {
return NGHTTP2_ERR_INVALID_FRAME;
}
} else if(frame->hd.version == NGHTTP2_PROTO_SPDY3) {
if(payloadlen != 8) {
return NGHTTP2_ERR_INVALID_FRAME;
}
} else {
return NGHTTP2_ERR_UNSUPPORTED_VERSION;
}
frame->last_good_stream_id = nghttp2_get_uint32(payload) &
NGHTTP2_STREAM_ID_MASK;
if(frame->hd.version == NGHTTP2_PROTO_SPDY3) {
frame->status_code = nghttp2_get_uint32(payload+4);
} else {
frame->status_code = 0;
}
return 0;
}
ssize_t nghttp2_frame_pack_headers(uint8_t **buf_ptr, size_t *buflen_ptr,
uint8_t **nvbuf_ptr, size_t *nvbuflen_ptr,
nghttp2_headers *frame,
nghttp2_zlib *deflater)
{
ssize_t framelen;
size_t len_size;
ssize_t nv_offset;
len_size = nghttp2_frame_get_len_size(frame->hd.version);
if(len_size == 0) {
return NGHTTP2_ERR_UNSUPPORTED_VERSION;
}
nv_offset = nghttp2_frame_nv_offset(NGHTTP2_HEADERS, frame->hd.version);
assert(nv_offset > 0);
framelen = nghttp2_frame_alloc_pack_nv(buf_ptr, buflen_ptr,
nvbuf_ptr, nvbuflen_ptr,
frame->nv, nv_offset,
len_size, deflater);
if(framelen < 0) {
return framelen;
}
frame->hd.length = framelen-NGHTTP2_FRAME_HEAD_LENGTH;
memset(*buf_ptr, 0, nv_offset);
nghttp2_frame_pack_ctrl_hd(*buf_ptr, &frame->hd);
nghttp2_put_uint32be(&(*buf_ptr)[8], frame->stream_id);
return framelen;
}
int nghttp2_frame_unpack_headers(nghttp2_headers *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen,
nghttp2_buffer *inflatebuf)
{
int r;
r = nghttp2_frame_unpack_headers_without_nv(frame, head, headlen,
payload, payloadlen);
if(r == 0) {
size_t len_size;
len_size = nghttp2_frame_get_len_size(frame->hd.version);
if(len_size == 0) {
return NGHTTP2_ERR_UNSUPPORTED_VERSION;
}
r = nghttp2_frame_unpack_nv(&frame->nv, inflatebuf, len_size);
}
return r;
}
int nghttp2_frame_unpack_headers_without_nv(nghttp2_headers *frame,
const uint8_t *head,
size_t headlen,
const uint8_t *payload,
size_t payloadlen)
{
ssize_t nv_offset;
nghttp2_frame_unpack_ctrl_hd(&frame->hd, head);
nv_offset = nghttp2_frame_nv_offset(NGHTTP2_HEADERS, frame->hd.version);
assert(nv_offset > 0);
if((ssize_t)(headlen + payloadlen) != nv_offset) {
return NGHTTP2_ERR_INVALID_FRAME;
}
frame->stream_id = nghttp2_get_uint32(payload) & NGHTTP2_STREAM_ID_MASK;
frame->nv = NULL;
return 0;
}
ssize_t nghttp2_frame_pack_rst_stream(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_rst_stream *frame)
{
ssize_t framelen = 16;
int r;
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, framelen);
if(r != 0) {
return r;
}
memset(*buf_ptr, 0, framelen);
nghttp2_frame_pack_ctrl_hd(*buf_ptr, &frame->hd);
nghttp2_put_uint32be(&(*buf_ptr)[8], frame->stream_id);
nghttp2_put_uint32be(&(*buf_ptr)[12], frame->status_code);
return framelen;
}
int nghttp2_frame_unpack_rst_stream(nghttp2_rst_stream *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen)
{
if(payloadlen != 8) {
return NGHTTP2_ERR_INVALID_FRAME;
}
nghttp2_frame_unpack_ctrl_hd(&frame->hd, head);
frame->stream_id = nghttp2_get_uint32(payload) & NGHTTP2_STREAM_ID_MASK;
frame->status_code = nghttp2_get_uint32(payload+4);
return 0;
}
ssize_t nghttp2_frame_pack_window_update(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_window_update *frame)
{
ssize_t framelen = 16;
int r;
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, framelen);
if(r != 0) {
return r;
}
memset(*buf_ptr, 0, framelen);
nghttp2_frame_pack_ctrl_hd(*buf_ptr, &frame->hd);
nghttp2_put_uint32be(&(*buf_ptr)[8], frame->stream_id);
nghttp2_put_uint32be(&(*buf_ptr)[12], frame->delta_window_size);
return framelen;
}
int nghttp2_frame_unpack_window_update(nghttp2_window_update *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload,
size_t payloadlen)
{
if(payloadlen != 8) {
return NGHTTP2_ERR_INVALID_FRAME;
}
nghttp2_frame_unpack_ctrl_hd(&frame->hd, head);
frame->stream_id = nghttp2_get_uint32(payload) & NGHTTP2_STREAM_ID_MASK;
frame->delta_window_size = nghttp2_get_uint32(&payload[4]) &
NGHTTP2_DELTA_WINDOW_SIZE_MASK;
return 0;
}
ssize_t nghttp2_frame_pack_settings(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_settings *frame)
{
ssize_t framelen = NGHTTP2_FRAME_HEAD_LENGTH+frame->hd.length;
size_t i;
int r;
if(frame->hd.version != NGHTTP2_PROTO_SPDY2 &&
frame->hd.version != NGHTTP2_PROTO_SPDY3) {
return NGHTTP2_ERR_UNSUPPORTED_VERSION;
}
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, framelen);
if(r != 0) {
return r;
}
memset(*buf_ptr, 0, framelen);
nghttp2_frame_pack_ctrl_hd(*buf_ptr, &frame->hd);
nghttp2_put_uint32be(&(*buf_ptr)[8], frame->niv);
if(frame->hd.version == NGHTTP2_PROTO_SPDY2) {
for(i = 0; i < frame->niv; ++i) {
int off = i*8;
/* spdy/2 spec says ID is network byte order, but publicly
deployed server sends little endian host byte order. */
(*buf_ptr)[12+off+0] = (frame->iv[i].settings_id) & 0xff;
(*buf_ptr)[12+off+1] = (frame->iv[i].settings_id >> 8) & 0xff;
(*buf_ptr)[12+off+2] = (frame->iv[i].settings_id >>16) & 0xff;
(*buf_ptr)[15+off] = frame->iv[i].flags;
nghttp2_put_uint32be(&(*buf_ptr)[16+off], frame->iv[i].value);
}
} else {
for(i = 0; i < frame->niv; ++i) {
int off = i*8;
nghttp2_put_uint32be(&(*buf_ptr)[12+off], frame->iv[i].settings_id);
(*buf_ptr)[12+off] = frame->iv[i].flags;
nghttp2_put_uint32be(&(*buf_ptr)[16+off], frame->iv[i].value);
}
}
return framelen;
}
int nghttp2_frame_unpack_settings(nghttp2_settings *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen)
{
size_t i;
if(payloadlen < 4) {
return NGHTTP2_ERR_INVALID_FRAME;
}
nghttp2_frame_unpack_ctrl_hd(&frame->hd, head);
if(frame->hd.version != NGHTTP2_PROTO_SPDY2 &&
frame->hd.version != NGHTTP2_PROTO_SPDY3) {
return NGHTTP2_ERR_UNSUPPORTED_VERSION;
}
frame->niv = nghttp2_get_uint32(payload);
if(payloadlen != 4+frame->niv*8) {
return NGHTTP2_ERR_INVALID_FRAME;
}
frame->iv = malloc(frame->niv*sizeof(nghttp2_settings_entry));
if(frame->iv == NULL) {
return NGHTTP2_ERR_NOMEM;
}
if(frame->hd.version == NGHTTP2_PROTO_SPDY2) {
for(i = 0; i < frame->niv; ++i) {
size_t off = i*8;
/* ID is little endian. See comments in
nghttp2_frame_pack_settings(). */
frame->iv[i].settings_id = payload[4+off] + (payload[4+off+1] << 8)
+(payload[4+off+2] << 16);
frame->iv[i].flags = payload[7+off];
frame->iv[i].value = nghttp2_get_uint32(&payload[8+off]);
}
} else {
for(i = 0; i < frame->niv; ++i) {
size_t off = i*8;
frame->iv[i].settings_id = nghttp2_get_uint32(&payload[4+off]) &
NGHTTP2_SETTINGS_ID_MASK;
frame->iv[i].flags = payload[4+off];
frame->iv[i].value = nghttp2_get_uint32(&payload[8+off]);
}
}
return 0;
}
ssize_t nghttp2_frame_pack_credential(uint8_t **buf_ptr, size_t *buflen_ptr,
nghttp2_credential *frame)
{
ssize_t framelen;
int r;
size_t i, offset;
framelen = NGHTTP2_FRAME_HEAD_LENGTH+2+4+frame->proof.length;
for(i = 0; i < frame->ncerts; ++i) {
framelen += 4+frame->certs[i].length;
}
r = nghttp2_reserve_buffer(buf_ptr, buflen_ptr, framelen);
if(r != 0) {
return r;
}
memset(*buf_ptr, 0, framelen);
nghttp2_frame_pack_ctrl_hd(*buf_ptr, &frame->hd);
offset = NGHTTP2_FRAME_HEAD_LENGTH;
nghttp2_put_uint16be(&(*buf_ptr)[offset], frame->slot);
offset += 2;
nghttp2_put_uint32be(&(*buf_ptr)[offset], frame->proof.length);
offset += 4;
memcpy(&(*buf_ptr)[offset], frame->proof.data, frame->proof.length);
offset += frame->proof.length;
for(i = 0; i < frame->ncerts; ++i) {
nghttp2_put_uint32be(&(*buf_ptr)[offset], frame->certs[i].length);
offset += 4;
memcpy(&(*buf_ptr)[offset], frame->certs[i].data, frame->certs[i].length);
offset += frame->certs[i].length;
}
return framelen;
}
/*
* Counts number of client certificate in CREDENTIAL frame payload
* |payload| with length |payloadlen|. The |payload| points to the
* length of the first certificate. This function also checks the
* frame payload is properly composed.
*
* This function returns the number of certificates in |payload| if it
* succeeds, or one of the following negative error codes:
*
* NGHTTP2_ERR_INVALID_FRAME
* The frame payload is invalid.
*/
static int nghttp2_frame_count_unpack_cert(const uint8_t *payload,
size_t payloadlen)
{
size_t n, offset = 0;
for(n = 1; 1; ++n) {
size_t len;
if(offset+4 > payloadlen) {
return NGHTTP2_ERR_INVALID_FRAME;
}
len = nghttp2_get_uint32(&payload[offset]);
offset += 4;
if(len > payloadlen || offset+len > payloadlen) {
return NGHTTP2_ERR_INVALID_FRAME;
} else {
offset += len;
if(offset == payloadlen) {
break;
}
}
}
return n;
}
/*
* Unpacks client certificates in the |payload| with length
* |payloadlen|. First allocates memory to store the |ncerts|
* certificates. Stores certificates in the allocated space and set
* its pointer to |*certs_ptr|.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory
*/
static int nghttp2_frame_unpack_cert(nghttp2_mem_chunk **certs_ptr,
size_t ncerts,
const uint8_t *payload, size_t payloadlen)
{
size_t offset, i, j;
nghttp2_mem_chunk *certs;
certs = malloc(sizeof(nghttp2_mem_chunk)*ncerts);
if(certs == NULL) {
return NGHTTP2_ERR_NOMEM;
}
offset = 0;
for(i = 0; i < ncerts; ++i) {
certs[i].length = nghttp2_get_uint32(&payload[offset]);
offset += 4;
certs[i].data = malloc(certs[i].length);
if(certs[i].data == NULL) {
goto fail;
}
memcpy(certs[i].data, &payload[offset], certs[i].length);
offset += certs[i].length;
}
*certs_ptr = certs;
return 0;
fail:
for(j = 0; j < i; ++j) {
free(certs[j].data);
}
free(certs);
return NGHTTP2_ERR_NOMEM;
}
int nghttp2_frame_unpack_credential(nghttp2_credential *frame,
const uint8_t *head, size_t headlen,
const uint8_t *payload,
size_t payloadlen)
{
size_t offset;
int rv;
if(payloadlen < 10) {
return NGHTTP2_ERR_INVALID_FRAME;
}
nghttp2_frame_unpack_ctrl_hd(&frame->hd, head);
offset = 0;
frame->slot = nghttp2_get_uint16(&payload[offset]);
offset += 2;
frame->proof.length = nghttp2_get_uint32(&payload[offset]);
offset += 4;
if(frame->proof.length > payloadlen ||
offset+frame->proof.length > payloadlen) {
return NGHTTP2_ERR_INVALID_FRAME;
}
frame->proof.data = malloc(frame->proof.length);
if(frame->proof.data == NULL) {
return NGHTTP2_ERR_NOMEM;
}
memcpy(frame->proof.data, &payload[offset], frame->proof.length);
offset += frame->proof.length;
rv = nghttp2_frame_count_unpack_cert(payload+offset, payloadlen-offset);
if(rv < 0) {
goto fail;
}
frame->ncerts = rv;
rv = nghttp2_frame_unpack_cert(&frame->certs, frame->ncerts,
payload+offset, payloadlen-offset);
if(rv != 0) {
goto fail;
}
return 0;
fail:
free(frame->proof.data);
return rv;
}
nghttp2_settings_entry* nghttp2_frame_iv_copy(const nghttp2_settings_entry *iv,
size_t niv)
{
nghttp2_settings_entry *iv_copy;
size_t len = niv*sizeof(nghttp2_settings_entry);
iv_copy = malloc(len);
if(iv_copy == NULL) {
return NULL;
}
memcpy(iv_copy, iv, len);
return iv_copy;
}
static int nghttp2_settings_entry_compar(const void *lhs, const void *rhs)
{
return ((nghttp2_settings_entry *)lhs)->settings_id
-((nghttp2_settings_entry *)rhs)->settings_id;
}
void nghttp2_frame_iv_sort(nghttp2_settings_entry *iv, size_t niv)
{
qsort(iv, niv, sizeof(nghttp2_settings_entry), nghttp2_settings_entry_compar);
}
ssize_t nghttp2_frame_nv_offset(nghttp2_frame_type type, uint16_t version)
{
switch(type) {
case NGHTTP2_SYN_STREAM:
return NGHTTP2_SYN_STREAM_NV_OFFSET;
case NGHTTP2_SYN_REPLY: {
if(version == NGHTTP2_PROTO_SPDY2) {
return NGHTTP2_SPDY2_SYN_REPLY_NV_OFFSET;
} else if(version == NGHTTP2_PROTO_SPDY3) {
return NGHTTP2_SPDY3_SYN_REPLY_NV_OFFSET;
}
break;
}
case NGHTTP2_HEADERS: {
if(version == NGHTTP2_PROTO_SPDY2) {
return NGHTTP2_SPDY2_HEADERS_NV_OFFSET;
} else if(version == NGHTTP2_PROTO_SPDY3) {
return NGHTTP2_SPDY3_HEADERS_NV_OFFSET;
}
break;
}
default:
break;
}
return -1;
}
int nghttp2_frame_nv_check_null(const char **nv)
{
size_t i, j;
for(i = 0; nv[i]; i += 2) {
if(nv[i][0] == '\0' || nv[i+1] == NULL) {
return 0;
}
for(j = 0; nv[i][j]; ++j) {
unsigned char c = nv[i][j];
if(c < 0x20 || c > 0x7e) {
return 0;
}
}
}
return 1;
}
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