/*
* 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_helper.h"
#include <assert.h>
#include <string.h>
#include "nghttp2_net.h"
void nghttp2_put_uint16be(uint8_t *buf, uint16_t n)
{
uint16_t x = htons(n);
memcpy(buf, &x, sizeof(uint16_t));
}
void nghttp2_put_uint32be(uint8_t *buf, uint32_t n)
{
uint32_t x = htonl(n);
memcpy(buf, &x, sizeof(uint32_t));
}
uint16_t nghttp2_get_uint16(const uint8_t *data)
{
uint16_t n;
memcpy(&n, data, sizeof(uint16_t));
return ntohs(n);
}
uint32_t nghttp2_get_uint32(const uint8_t *data)
{
uint32_t n;
memcpy(&n, data, sizeof(uint32_t));
return ntohl(n);
}
int nghttp2_reserve_buffer(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t min_length)
{
if(min_length > *buflen_ptr) {
uint8_t *temp;
min_length = (min_length+4095)/4096*4096;
temp = realloc(*buf_ptr, min_length);
if(temp == NULL) {
return NGHTTP2_ERR_NOMEM;
} else {
*buf_ptr = temp;
*buflen_ptr = min_length;
}
}
return 0;
}
void* nghttp2_memdup(const void* src, size_t n)
{
void* dest = malloc(n);
if(dest == NULL) {
return NULL;
}
memcpy(dest, src, n);
return dest;
}
void nghttp2_downcase(uint8_t *s, size_t len)
{
size_t i;
for(i = 0; i < len; ++i) {
if('A' <= s[i] && s[i] <= 'Z') {
s[i] += 'a'-'A';
}
}
}
int nghttp2_adjust_local_window_size(int32_t *local_window_size_ptr,
int32_t *recv_window_size_ptr,
int32_t *recv_reduction_ptr,
int32_t *delta_ptr)
{
if(*delta_ptr > 0) {
int32_t new_recv_window_size =
nghttp2_max(0, *recv_window_size_ptr) - *delta_ptr;
if(new_recv_window_size < 0) {
/* The delta size is strictly more than received bytes. Increase
local_window_size by that difference. */
int32_t recv_reduction_diff;
if(*local_window_size_ptr >
NGHTTP2_MAX_WINDOW_SIZE + new_recv_window_size) {
return NGHTTP2_ERR_FLOW_CONTROL;
}
*local_window_size_ptr -= new_recv_window_size;
/* If there is recv_reduction due to earlier window_size
reduction, we have to adjust it too. */
recv_reduction_diff = nghttp2_min(*recv_reduction_ptr,
-new_recv_window_size);
*recv_reduction_ptr -= recv_reduction_diff;
if(*recv_window_size_ptr < 0) {
*recv_window_size_ptr += recv_reduction_diff;
} else {
/* If *recv_window_size_ptr > 0, then those bytes are
considered to be backed to the remote peer (by
WINDOW_UPDATE with the adjusted *delta_ptr), so it is
effectively 0 now. */
*recv_window_size_ptr = recv_reduction_diff;
}
/* recv_reduction_diff must be paied from *delta_ptr, since it
was added in window size reduction (see below). */
*delta_ptr -= recv_reduction_diff;
} else {
*recv_window_size_ptr = new_recv_window_size;
}
return 0;
} else {
if(*local_window_size_ptr + *delta_ptr < 0 ||
*recv_window_size_ptr < INT32_MIN - *delta_ptr ||
*recv_reduction_ptr > INT32_MAX + *delta_ptr) {
return NGHTTP2_ERR_FLOW_CONTROL;
}
/* Decreasing local window size. Note that we achieve this without
noticing to the remote peer. To do this, we cut
recv_window_size by -delta. This means that we don't send
WINDOW_UPDATE for -delta bytes. */
*local_window_size_ptr += *delta_ptr;
*recv_window_size_ptr += *delta_ptr;
*recv_reduction_ptr -= *delta_ptr;
*delta_ptr = 0;
}
return 0;
}
int nghttp2_should_send_window_update(int32_t local_window_size,
int32_t recv_window_size)
{
return recv_window_size >= local_window_size / 2;
}
const char* nghttp2_strerror(int error_code)
{
switch(error_code) {
case 0:
return "Success";
case NGHTTP2_ERR_INVALID_ARGUMENT:
return "Invalid argument";
case NGHTTP2_ERR_UNSUPPORTED_VERSION:
return "Unsupported SPDY version";
case NGHTTP2_ERR_WOULDBLOCK:
return "Operation would block";
case NGHTTP2_ERR_PROTO:
return "Protocol error";
case NGHTTP2_ERR_INVALID_FRAME:
return "Invalid frame octets";
case NGHTTP2_ERR_EOF:
return "EOF";
case NGHTTP2_ERR_DEFERRED:
return "Data transfer deferred";
case NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE:
return "No more Stream ID available";
case NGHTTP2_ERR_STREAM_CLOSED:
return "Stream was already closed or invalid";
case NGHTTP2_ERR_STREAM_CLOSING:
return "Stream is closing";
case NGHTTP2_ERR_STREAM_SHUT_WR:
return "The transmission is not allowed for this stream";
case NGHTTP2_ERR_INVALID_STREAM_ID:
return "Stream ID is invalid";
case NGHTTP2_ERR_INVALID_STREAM_STATE:
return "Invalid stream state";
case NGHTTP2_ERR_DEFERRED_DATA_EXIST:
return "Another DATA frame has already been deferred";
case NGHTTP2_ERR_START_STREAM_NOT_ALLOWED:
return "request HEADERS is not allowed";
case NGHTTP2_ERR_GOAWAY_ALREADY_SENT:
return "GOAWAY has already been sent";
case NGHTTP2_ERR_INVALID_HEADER_BLOCK:
return "Invalid header block";
case NGHTTP2_ERR_INVALID_STATE:
return "Invalid state";
case NGHTTP2_ERR_GZIP:
return "Gzip error";
case NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE:
return "The user callback function failed due to the temporal error";
case NGHTTP2_ERR_FRAME_SIZE_ERROR:
return "The length of the frame is invalid";
case NGHTTP2_ERR_HEADER_COMP:
return "Header compression/decompression error";
case NGHTTP2_ERR_NOMEM:
return "Out of memory";
case NGHTTP2_ERR_CALLBACK_FAILURE:
return "The user callback function failed";
default:
return "Unknown error code";
}
}
void nghttp2_free(void *ptr)
{
free(ptr);
}
static int VALID_HD_NAME_CHARS[] = {
0 /* NUL */, 0 /* SOH */, 0 /* STX */, 0 /* ETX */,
0 /* EOT */, 0 /* ENQ */, 0 /* ACK */, 0 /* BEL */,
0 /* BS */, 0 /* HT */, 0 /* LF */, 0 /* VT */,
0 /* FF */, 0 /* CR */, 0 /* SO */, 0 /* SI */,
0 /* DLE */, 0 /* DC1 */, 0 /* DC2 */, 0 /* DC3 */,
0 /* DC4 */, 0 /* NAK */, 0 /* SYN */, 0 /* ETB */,
0 /* CAN */, 0 /* EM */, 0 /* SUB */, 0 /* ESC */,
0 /* FS */, 0 /* GS */, 0 /* RS */, 0 /* US */,
0 /* SPC */, 1 /* ! */, 0 /* " */, 1 /* # */,
1 /* $ */, 1 /* % */, 1 /* & */, 1 /* ' */,
0 /* ( */, 0 /* ) */, 1 /* * */, 1 /* + */,
0 /* , */, 1 /* - */, 1 /* . */, 0 /* / */,
1 /* 0 */, 1 /* 1 */, 1 /* 2 */, 1 /* 3 */,
1 /* 4 */, 1 /* 5 */, 1 /* 6 */, 1 /* 7 */,
1 /* 8 */, 1 /* 9 */, 0 /* : */, 0 /* ; */,
0 /* < */, 0 /* = */, 0 /* > */, 0 /* ? */,
0 /* @ */, 0 /* A */, 0 /* B */, 0 /* C */,
0 /* D */, 0 /* E */, 0 /* F */, 0 /* G */,
0 /* H */, 0 /* I */, 0 /* J */, 0 /* K */,
0 /* L */, 0 /* M */, 0 /* N */, 0 /* O */,
0 /* P */, 0 /* Q */, 0 /* R */, 0 /* S */,
0 /* T */, 0 /* U */, 0 /* V */, 0 /* W */,
0 /* X */, 0 /* Y */, 0 /* Z */, 0 /* [ */,
0 /* \ */, 0 /* ] */, 1 /* ^ */, 1 /* _ */,
1 /* ` */, 1 /* a */, 1 /* b */, 1 /* c */,
1 /* d */, 1 /* e */, 1 /* f */, 1 /* g */,
1 /* h */, 1 /* i */, 1 /* j */, 1 /* k */,
1 /* l */, 1 /* m */, 1 /* n */, 1 /* o */,
1 /* p */, 1 /* q */, 1 /* r */, 1 /* s */,
1 /* t */, 1 /* u */, 1 /* v */, 1 /* w */,
1 /* x */, 1 /* y */, 1 /* z */, 0 /* { */,
1 /* | */, 0 /* } */, 1 /* ~ */, 0 /* DEL */,
0 /* 0x80 */, 0 /* 0x81 */, 0 /* 0x82 */, 0 /* 0x83 */,
0 /* 0x84 */, 0 /* 0x85 */, 0 /* 0x86 */, 0 /* 0x87 */,
0 /* 0x88 */, 0 /* 0x89 */, 0 /* 0x8a */, 0 /* 0x8b */,
0 /* 0x8c */, 0 /* 0x8d */, 0 /* 0x8e */, 0 /* 0x8f */,
0 /* 0x90 */, 0 /* 0x91 */, 0 /* 0x92 */, 0 /* 0x93 */,
0 /* 0x94 */, 0 /* 0x95 */, 0 /* 0x96 */, 0 /* 0x97 */,
0 /* 0x98 */, 0 /* 0x99 */, 0 /* 0x9a */, 0 /* 0x9b */,
0 /* 0x9c */, 0 /* 0x9d */, 0 /* 0x9e */, 0 /* 0x9f */,
0 /* 0xa0 */, 0 /* 0xa1 */, 0 /* 0xa2 */, 0 /* 0xa3 */,
0 /* 0xa4 */, 0 /* 0xa5 */, 0 /* 0xa6 */, 0 /* 0xa7 */,
0 /* 0xa8 */, 0 /* 0xa9 */, 0 /* 0xaa */, 0 /* 0xab */,
0 /* 0xac */, 0 /* 0xad */, 0 /* 0xae */, 0 /* 0xaf */,
0 /* 0xb0 */, 0 /* 0xb1 */, 0 /* 0xb2 */, 0 /* 0xb3 */,
0 /* 0xb4 */, 0 /* 0xb5 */, 0 /* 0xb6 */, 0 /* 0xb7 */,
0 /* 0xb8 */, 0 /* 0xb9 */, 0 /* 0xba */, 0 /* 0xbb */,
0 /* 0xbc */, 0 /* 0xbd */, 0 /* 0xbe */, 0 /* 0xbf */,
0 /* 0xc0 */, 0 /* 0xc1 */, 0 /* 0xc2 */, 0 /* 0xc3 */,
0 /* 0xc4 */, 0 /* 0xc5 */, 0 /* 0xc6 */, 0 /* 0xc7 */,
0 /* 0xc8 */, 0 /* 0xc9 */, 0 /* 0xca */, 0 /* 0xcb */,
0 /* 0xcc */, 0 /* 0xcd */, 0 /* 0xce */, 0 /* 0xcf */,
0 /* 0xd0 */, 0 /* 0xd1 */, 0 /* 0xd2 */, 0 /* 0xd3 */,
0 /* 0xd4 */, 0 /* 0xd5 */, 0 /* 0xd6 */, 0 /* 0xd7 */,
0 /* 0xd8 */, 0 /* 0xd9 */, 0 /* 0xda */, 0 /* 0xdb */,
0 /* 0xdc */, 0 /* 0xdd */, 0 /* 0xde */, 0 /* 0xdf */,
0 /* 0xe0 */, 0 /* 0xe1 */, 0 /* 0xe2 */, 0 /* 0xe3 */,
0 /* 0xe4 */, 0 /* 0xe5 */, 0 /* 0xe6 */, 0 /* 0xe7 */,
0 /* 0xe8 */, 0 /* 0xe9 */, 0 /* 0xea */, 0 /* 0xeb */,
0 /* 0xec */, 0 /* 0xed */, 0 /* 0xee */, 0 /* 0xef */,
0 /* 0xf0 */, 0 /* 0xf1 */, 0 /* 0xf2 */, 0 /* 0xf3 */,
0 /* 0xf4 */, 0 /* 0xf5 */, 0 /* 0xf6 */, 0 /* 0xf7 */,
0 /* 0xf8 */, 0 /* 0xf9 */, 0 /* 0xfa */, 0 /* 0xfb */,
0 /* 0xfc */, 0 /* 0xfd */, 0 /* 0xfe */, 0 /* 0xff */
};
int nghttp2_check_header_name(const uint8_t *name, size_t len)
{
const uint8_t *last;
if(len == 0) {
return 0;
}
if(*name == ':') {
if(len == 1) {
return 0;
}
++name;
--len;
}
for(last = name + len; name != last; ++name) {
if(!VALID_HD_NAME_CHARS[*name]) {
return 0;
}
}
return 1;
}
static int VALID_HD_VALUE_CHARS[] = {
1 /* NUL */, 0 /* SOH */, 0 /* STX */, 0 /* ETX */,
0 /* EOT */, 0 /* ENQ */, 0 /* ACK */, 0 /* BEL */,
0 /* BS */, 1 /* HT */, 0 /* LF */, 0 /* VT */,
0 /* FF */, 0 /* CR */, 0 /* SO */, 0 /* SI */,
0 /* DLE */, 0 /* DC1 */, 0 /* DC2 */, 0 /* DC3 */,
0 /* DC4 */, 0 /* NAK */, 0 /* SYN */, 0 /* ETB */,
0 /* CAN */, 0 /* EM */, 0 /* SUB */, 0 /* ESC */,
0 /* FS */, 0 /* GS */, 0 /* RS */, 0 /* US */,
1 /* SPC */, 1 /* ! */, 1 /* " */, 1 /* # */,
1 /* $ */, 1 /* % */, 1 /* & */, 1 /* ' */,
1 /* ( */, 1 /* ) */, 1 /* * */, 1 /* + */,
1 /* , */, 1 /* - */, 1 /* . */, 1 /* / */,
1 /* 0 */, 1 /* 1 */, 1 /* 2 */, 1 /* 3 */,
1 /* 4 */, 1 /* 5 */, 1 /* 6 */, 1 /* 7 */,
1 /* 8 */, 1 /* 9 */, 1 /* : */, 1 /* ; */,
1 /* < */, 1 /* = */, 1 /* > */, 1 /* ? */,
1 /* @ */, 1 /* A */, 1 /* B */, 1 /* C */,
1 /* D */, 1 /* E */, 1 /* F */, 1 /* G */,
1 /* H */, 1 /* I */, 1 /* J */, 1 /* K */,
1 /* L */, 1 /* M */, 1 /* N */, 1 /* O */,
1 /* P */, 1 /* Q */, 1 /* R */, 1 /* S */,
1 /* T */, 1 /* U */, 1 /* V */, 1 /* W */,
1 /* X */, 1 /* Y */, 1 /* Z */, 1 /* [ */,
1 /* \ */, 1 /* ] */, 1 /* ^ */, 1 /* _ */,
1 /* ` */, 1 /* a */, 1 /* b */, 1 /* c */,
1 /* d */, 1 /* e */, 1 /* f */, 1 /* g */,
1 /* h */, 1 /* i */, 1 /* j */, 1 /* k */,
1 /* l */, 1 /* m */, 1 /* n */, 1 /* o */,
1 /* p */, 1 /* q */, 1 /* r */, 1 /* s */,
1 /* t */, 1 /* u */, 1 /* v */, 1 /* w */,
1 /* x */, 1 /* y */, 1 /* z */, 1 /* { */,
1 /* | */, 1 /* } */, 1 /* ~ */, 0 /* DEL */,
1 /* 0x80 */, 1 /* 0x81 */, 1 /* 0x82 */, 1 /* 0x83 */,
1 /* 0x84 */, 1 /* 0x85 */, 1 /* 0x86 */, 1 /* 0x87 */,
1 /* 0x88 */, 1 /* 0x89 */, 1 /* 0x8a */, 1 /* 0x8b */,
1 /* 0x8c */, 1 /* 0x8d */, 1 /* 0x8e */, 1 /* 0x8f */,
1 /* 0x90 */, 1 /* 0x91 */, 1 /* 0x92 */, 1 /* 0x93 */,
1 /* 0x94 */, 1 /* 0x95 */, 1 /* 0x96 */, 1 /* 0x97 */,
1 /* 0x98 */, 1 /* 0x99 */, 1 /* 0x9a */, 1 /* 0x9b */,
1 /* 0x9c */, 1 /* 0x9d */, 1 /* 0x9e */, 1 /* 0x9f */,
1 /* 0xa0 */, 1 /* 0xa1 */, 1 /* 0xa2 */, 1 /* 0xa3 */,
1 /* 0xa4 */, 1 /* 0xa5 */, 1 /* 0xa6 */, 1 /* 0xa7 */,
1 /* 0xa8 */, 1 /* 0xa9 */, 1 /* 0xaa */, 1 /* 0xab */,
1 /* 0xac */, 1 /* 0xad */, 1 /* 0xae */, 1 /* 0xaf */,
1 /* 0xb0 */, 1 /* 0xb1 */, 1 /* 0xb2 */, 1 /* 0xb3 */,
1 /* 0xb4 */, 1 /* 0xb5 */, 1 /* 0xb6 */, 1 /* 0xb7 */,
1 /* 0xb8 */, 1 /* 0xb9 */, 1 /* 0xba */, 1 /* 0xbb */,
1 /* 0xbc */, 1 /* 0xbd */, 1 /* 0xbe */, 1 /* 0xbf */,
1 /* 0xc0 */, 1 /* 0xc1 */, 1 /* 0xc2 */, 1 /* 0xc3 */,
1 /* 0xc4 */, 1 /* 0xc5 */, 1 /* 0xc6 */, 1 /* 0xc7 */,
1 /* 0xc8 */, 1 /* 0xc9 */, 1 /* 0xca */, 1 /* 0xcb */,
1 /* 0xcc */, 1 /* 0xcd */, 1 /* 0xce */, 1 /* 0xcf */,
1 /* 0xd0 */, 1 /* 0xd1 */, 1 /* 0xd2 */, 1 /* 0xd3 */,
1 /* 0xd4 */, 1 /* 0xd5 */, 1 /* 0xd6 */, 1 /* 0xd7 */,
1 /* 0xd8 */, 1 /* 0xd9 */, 1 /* 0xda */, 1 /* 0xdb */,
1 /* 0xdc */, 1 /* 0xdd */, 1 /* 0xde */, 1 /* 0xdf */,
1 /* 0xe0 */, 1 /* 0xe1 */, 1 /* 0xe2 */, 1 /* 0xe3 */,
1 /* 0xe4 */, 1 /* 0xe5 */, 1 /* 0xe6 */, 1 /* 0xe7 */,
1 /* 0xe8 */, 1 /* 0xe9 */, 1 /* 0xea */, 1 /* 0xeb */,
1 /* 0xec */, 1 /* 0xed */, 1 /* 0xee */, 1 /* 0xef */,
1 /* 0xf0 */, 1 /* 0xf1 */, 1 /* 0xf2 */, 1 /* 0xf3 */,
1 /* 0xf4 */, 1 /* 0xf5 */, 1 /* 0xf6 */, 1 /* 0xf7 */,
1 /* 0xf8 */, 1 /* 0xf9 */, 1 /* 0xfa */, 1 /* 0xfb */,
1 /* 0xfc */, 1 /* 0xfd */, 1 /* 0xfe */, 1 /* 0xff */
};
int nghttp2_check_header_value(const uint8_t *value, size_t len)
{
const uint8_t *last;
for(last = value + len; value != last; ++value) {
if(!VALID_HD_VALUE_CHARS[*value]) {
return 0;
}
}
return 1;
}
uint8_t* nghttp2_cpymem(uint8_t *dest, const void *src, size_t len)
{
memcpy(dest, src, len);
return dest + len;
}