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nghttp2/lib/nghttp2_hd.c

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2013 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_hd.h"
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include "nghttp2_helper.h"
#include "nghttp2_int.h"
/* Make scalar initialization form of nghttp2_hd_entry */
#define MAKE_STATIC_ENT(N, V, T) \
{ \
{ (uint8_t *)(N), (uint8_t *)(V), sizeof((N)) - 1, sizeof((V)) - 1, 0 } \
, (T), 1, NGHTTP2_HD_FLAG_NONE \
}
/* Generated by mkstatictbl.py */
/* 3rd parameter is nghttp2_token value for header field name. We use
first enum value if same header names are repeated (e.g.,
:status). */
static nghttp2_hd_entry static_table[] = {
MAKE_STATIC_ENT(":authority", "", 0),
MAKE_STATIC_ENT(":method", "GET", 1),
MAKE_STATIC_ENT(":method", "POST", 1),
MAKE_STATIC_ENT(":path", "/", 3),
MAKE_STATIC_ENT(":path", "/index.html", 3),
MAKE_STATIC_ENT(":scheme", "http", 5),
MAKE_STATIC_ENT(":scheme", "https", 5),
MAKE_STATIC_ENT(":status", "200", 7),
MAKE_STATIC_ENT(":status", "204", 7),
MAKE_STATIC_ENT(":status", "206", 7),
MAKE_STATIC_ENT(":status", "304", 7),
MAKE_STATIC_ENT(":status", "400", 7),
MAKE_STATIC_ENT(":status", "404", 7),
MAKE_STATIC_ENT(":status", "500", 7),
MAKE_STATIC_ENT("accept-charset", "", 14),
MAKE_STATIC_ENT("accept-encoding", "gzip, deflate", 15),
MAKE_STATIC_ENT("accept-language", "", 16),
MAKE_STATIC_ENT("accept-ranges", "", 17),
MAKE_STATIC_ENT("accept", "", 18),
MAKE_STATIC_ENT("access-control-allow-origin", "", 19),
MAKE_STATIC_ENT("age", "", 20),
MAKE_STATIC_ENT("allow", "", 21),
MAKE_STATIC_ENT("authorization", "", 22),
MAKE_STATIC_ENT("cache-control", "", 23),
MAKE_STATIC_ENT("content-disposition", "", 24),
MAKE_STATIC_ENT("content-encoding", "", 25),
MAKE_STATIC_ENT("content-language", "", 26),
MAKE_STATIC_ENT("content-length", "", 27),
MAKE_STATIC_ENT("content-location", "", 28),
MAKE_STATIC_ENT("content-range", "", 29),
MAKE_STATIC_ENT("content-type", "", 30),
MAKE_STATIC_ENT("cookie", "", 31),
MAKE_STATIC_ENT("date", "", 32),
MAKE_STATIC_ENT("etag", "", 33),
MAKE_STATIC_ENT("expect", "", 34),
MAKE_STATIC_ENT("expires", "", 35),
MAKE_STATIC_ENT("from", "", 36),
MAKE_STATIC_ENT("host", "", 37),
MAKE_STATIC_ENT("if-match", "", 38),
MAKE_STATIC_ENT("if-modified-since", "", 39),
MAKE_STATIC_ENT("if-none-match", "", 40),
MAKE_STATIC_ENT("if-range", "", 41),
MAKE_STATIC_ENT("if-unmodified-since", "", 42),
MAKE_STATIC_ENT("last-modified", "", 43),
MAKE_STATIC_ENT("link", "", 44),
MAKE_STATIC_ENT("location", "", 45),
MAKE_STATIC_ENT("max-forwards", "", 46),
MAKE_STATIC_ENT("proxy-authenticate", "", 47),
MAKE_STATIC_ENT("proxy-authorization", "", 48),
MAKE_STATIC_ENT("range", "", 49),
MAKE_STATIC_ENT("referer", "", 50),
MAKE_STATIC_ENT("refresh", "", 51),
MAKE_STATIC_ENT("retry-after", "", 52),
MAKE_STATIC_ENT("server", "", 53),
MAKE_STATIC_ENT("set-cookie", "", 54),
MAKE_STATIC_ENT("strict-transport-security", "", 55),
MAKE_STATIC_ENT("transfer-encoding", "", 56),
MAKE_STATIC_ENT("user-agent", "", 57),
MAKE_STATIC_ENT("vary", "", 58),
MAKE_STATIC_ENT("via", "", 59),
MAKE_STATIC_ENT("www-authenticate", "", 60),
};
static int memeq(const void *s1, const void *s2, size_t n) {
return memcmp(s1, s2, n) == 0;
}
/*
* This function was generated by genlibtokenlookup.py. Inspired by
* h2o header lookup. https://github.com/h2o/h2o
*/
static inline int lookup_token(const uint8_t *name, size_t namelen) {
switch (namelen) {
case 2:
switch (name[1]) {
case 'e':
if (lstreq("t", name, 1)) {
return NGHTTP2_TOKEN_TE;
}
break;
}
break;
case 3:
switch (name[2]) {
case 'a':
if (lstreq("vi", name, 2)) {
return NGHTTP2_TOKEN_VIA;
}
break;
case 'e':
if (lstreq("ag", name, 2)) {
return NGHTTP2_TOKEN_AGE;
}
break;
}
break;
case 4:
switch (name[3]) {
case 'e':
if (lstreq("dat", name, 3)) {
return NGHTTP2_TOKEN_DATE;
}
break;
case 'g':
if (lstreq("eta", name, 3)) {
return NGHTTP2_TOKEN_ETAG;
}
break;
case 'k':
if (lstreq("lin", name, 3)) {
return NGHTTP2_TOKEN_LINK;
}
break;
case 'm':
if (lstreq("fro", name, 3)) {
return NGHTTP2_TOKEN_FROM;
}
break;
case 't':
if (lstreq("hos", name, 3)) {
return NGHTTP2_TOKEN_HOST;
}
break;
case 'y':
if (lstreq("var", name, 3)) {
return NGHTTP2_TOKEN_VARY;
}
break;
}
break;
case 5:
switch (name[4]) {
case 'e':
if (lstreq("rang", name, 4)) {
return NGHTTP2_TOKEN_RANGE;
}
break;
case 'h':
if (lstreq(":pat", name, 4)) {
return NGHTTP2_TOKEN__PATH;
}
if (lstreq(":pat", name, 4)) {
return NGHTTP2_TOKEN__PATH;
}
break;
case 'w':
if (lstreq("allo", name, 4)) {
return NGHTTP2_TOKEN_ALLOW;
}
break;
}
break;
case 6:
switch (name[5]) {
case 'e':
if (lstreq("cooki", name, 5)) {
return NGHTTP2_TOKEN_COOKIE;
}
break;
case 'r':
if (lstreq("serve", name, 5)) {
return NGHTTP2_TOKEN_SERVER;
}
break;
case 't':
if (lstreq("accep", name, 5)) {
return NGHTTP2_TOKEN_ACCEPT;
}
if (lstreq("expec", name, 5)) {
return NGHTTP2_TOKEN_EXPECT;
}
break;
}
break;
case 7:
switch (name[6]) {
case 'd':
if (lstreq(":metho", name, 6)) {
return NGHTTP2_TOKEN__METHOD;
}
if (lstreq(":metho", name, 6)) {
return NGHTTP2_TOKEN__METHOD;
}
break;
case 'e':
if (lstreq(":schem", name, 6)) {
return NGHTTP2_TOKEN__SCHEME;
}
if (lstreq(":schem", name, 6)) {
return NGHTTP2_TOKEN__SCHEME;
}
if (lstreq("upgrad", name, 6)) {
return NGHTTP2_TOKEN_UPGRADE;
}
break;
case 'h':
if (lstreq("refres", name, 6)) {
return NGHTTP2_TOKEN_REFRESH;
}
break;
case 'r':
if (lstreq("refere", name, 6)) {
return NGHTTP2_TOKEN_REFERER;
}
break;
case 's':
if (lstreq(":statu", name, 6)) {
return NGHTTP2_TOKEN__STATUS;
}
if (lstreq(":statu", name, 6)) {
return NGHTTP2_TOKEN__STATUS;
}
if (lstreq(":statu", name, 6)) {
return NGHTTP2_TOKEN__STATUS;
}
if (lstreq(":statu", name, 6)) {
return NGHTTP2_TOKEN__STATUS;
}
if (lstreq(":statu", name, 6)) {
return NGHTTP2_TOKEN__STATUS;
}
if (lstreq(":statu", name, 6)) {
return NGHTTP2_TOKEN__STATUS;
}
if (lstreq(":statu", name, 6)) {
return NGHTTP2_TOKEN__STATUS;
}
if (lstreq("expire", name, 6)) {
return NGHTTP2_TOKEN_EXPIRES;
}
break;
}
break;
case 8:
switch (name[7]) {
case 'e':
if (lstreq("if-rang", name, 7)) {
return NGHTTP2_TOKEN_IF_RANGE;
}
break;
case 'h':
if (lstreq("if-matc", name, 7)) {
return NGHTTP2_TOKEN_IF_MATCH;
}
break;
case 'n':
if (lstreq("locatio", name, 7)) {
return NGHTTP2_TOKEN_LOCATION;
}
break;
}
break;
case 10:
switch (name[9]) {
case 'e':
if (lstreq("keep-aliv", name, 9)) {
return NGHTTP2_TOKEN_KEEP_ALIVE;
}
if (lstreq("set-cooki", name, 9)) {
return NGHTTP2_TOKEN_SET_COOKIE;
}
break;
case 'n':
if (lstreq("connectio", name, 9)) {
return NGHTTP2_TOKEN_CONNECTION;
}
break;
case 't':
if (lstreq("user-agen", name, 9)) {
return NGHTTP2_TOKEN_USER_AGENT;
}
break;
case 'y':
if (lstreq(":authorit", name, 9)) {
return NGHTTP2_TOKEN__AUTHORITY;
}
break;
}
break;
case 11:
switch (name[10]) {
case 'r':
if (lstreq("retry-afte", name, 10)) {
return NGHTTP2_TOKEN_RETRY_AFTER;
}
break;
}
break;
case 12:
switch (name[11]) {
case 'e':
if (lstreq("content-typ", name, 11)) {
return NGHTTP2_TOKEN_CONTENT_TYPE;
}
break;
case 's':
if (lstreq("max-forward", name, 11)) {
return NGHTTP2_TOKEN_MAX_FORWARDS;
}
break;
}
break;
case 13:
switch (name[12]) {
case 'd':
if (lstreq("last-modifie", name, 12)) {
return NGHTTP2_TOKEN_LAST_MODIFIED;
}
break;
case 'e':
if (lstreq("content-rang", name, 12)) {
return NGHTTP2_TOKEN_CONTENT_RANGE;
}
break;
case 'h':
if (lstreq("if-none-matc", name, 12)) {
return NGHTTP2_TOKEN_IF_NONE_MATCH;
}
break;
case 'l':
if (lstreq("cache-contro", name, 12)) {
return NGHTTP2_TOKEN_CACHE_CONTROL;
}
break;
case 'n':
if (lstreq("authorizatio", name, 12)) {
return NGHTTP2_TOKEN_AUTHORIZATION;
}
break;
case 's':
if (lstreq("accept-range", name, 12)) {
return NGHTTP2_TOKEN_ACCEPT_RANGES;
}
break;
}
break;
case 14:
switch (name[13]) {
case 'h':
if (lstreq("content-lengt", name, 13)) {
return NGHTTP2_TOKEN_CONTENT_LENGTH;
}
break;
case 't':
if (lstreq("accept-charse", name, 13)) {
return NGHTTP2_TOKEN_ACCEPT_CHARSET;
}
break;
}
break;
case 15:
switch (name[14]) {
case 'e':
if (lstreq("accept-languag", name, 14)) {
return NGHTTP2_TOKEN_ACCEPT_LANGUAGE;
}
break;
case 'g':
if (lstreq("accept-encodin", name, 14)) {
return NGHTTP2_TOKEN_ACCEPT_ENCODING;
}
break;
}
break;
case 16:
switch (name[15]) {
case 'e':
if (lstreq("content-languag", name, 15)) {
return NGHTTP2_TOKEN_CONTENT_LANGUAGE;
}
if (lstreq("www-authenticat", name, 15)) {
return NGHTTP2_TOKEN_WWW_AUTHENTICATE;
}
break;
case 'g':
if (lstreq("content-encodin", name, 15)) {
return NGHTTP2_TOKEN_CONTENT_ENCODING;
}
break;
case 'n':
if (lstreq("content-locatio", name, 15)) {
return NGHTTP2_TOKEN_CONTENT_LOCATION;
}
if (lstreq("proxy-connectio", name, 15)) {
return NGHTTP2_TOKEN_PROXY_CONNECTION;
}
break;
}
break;
case 17:
switch (name[16]) {
case 'e':
if (lstreq("if-modified-sinc", name, 16)) {
return NGHTTP2_TOKEN_IF_MODIFIED_SINCE;
}
break;
case 'g':
if (lstreq("transfer-encodin", name, 16)) {
return NGHTTP2_TOKEN_TRANSFER_ENCODING;
}
break;
}
break;
case 18:
switch (name[17]) {
case 'e':
if (lstreq("proxy-authenticat", name, 17)) {
return NGHTTP2_TOKEN_PROXY_AUTHENTICATE;
}
break;
}
break;
case 19:
switch (name[18]) {
case 'e':
if (lstreq("if-unmodified-sinc", name, 18)) {
return NGHTTP2_TOKEN_IF_UNMODIFIED_SINCE;
}
break;
case 'n':
if (lstreq("content-dispositio", name, 18)) {
return NGHTTP2_TOKEN_CONTENT_DISPOSITION;
}
if (lstreq("proxy-authorizatio", name, 18)) {
return NGHTTP2_TOKEN_PROXY_AUTHORIZATION;
}
break;
}
break;
case 25:
switch (name[24]) {
case 'y':
if (lstreq("strict-transport-securit", name, 24)) {
return NGHTTP2_TOKEN_STRICT_TRANSPORT_SECURITY;
}
break;
}
break;
case 27:
switch (name[26]) {
case 'n':
if (lstreq("access-control-allow-origi", name, 26)) {
return NGHTTP2_TOKEN_ACCESS_CONTROL_ALLOW_ORIGIN;
}
break;
}
break;
}
return -1;
}
int nghttp2_hd_entry_init(nghttp2_hd_entry *ent, uint8_t flags, uint8_t *name,
size_t namelen, uint8_t *value, size_t valuelen,
int token, nghttp2_mem *mem) {
int rv = 0;
/* Since nghttp2_hd_entry is used for indexing, ent->nv.flags always
NGHTTP2_NV_FLAG_NONE */
ent->nv.flags = NGHTTP2_NV_FLAG_NONE;
if ((flags & NGHTTP2_HD_FLAG_NAME_ALLOC) &&
(flags & NGHTTP2_HD_FLAG_NAME_GIFT) == 0) {
if (namelen == 0) {
flags &= ~NGHTTP2_HD_FLAG_NAME_ALLOC;
ent->nv.name = (uint8_t *)"";
} else {
/* copy including terminating NULL byte */
ent->nv.name = nghttp2_memdup(name, namelen + 1, mem);
if (ent->nv.name == NULL) {
rv = NGHTTP2_ERR_NOMEM;
goto fail;
}
}
} else {
ent->nv.name = name;
}
if ((flags & NGHTTP2_HD_FLAG_VALUE_ALLOC) &&
(flags & NGHTTP2_HD_FLAG_VALUE_GIFT) == 0) {
if (valuelen == 0) {
flags &= ~NGHTTP2_HD_FLAG_VALUE_ALLOC;
ent->nv.value = (uint8_t *)"";
} else {
/* copy including terminating NULL byte */
ent->nv.value = nghttp2_memdup(value, valuelen + 1, mem);
if (ent->nv.value == NULL) {
rv = NGHTTP2_ERR_NOMEM;
goto fail2;
}
}
} else {
ent->nv.value = value;
}
ent->nv.namelen = namelen;
ent->nv.valuelen = valuelen;
ent->token = token;
ent->ref = 1;
ent->flags = flags;
return 0;
fail2:
if (flags & NGHTTP2_HD_FLAG_NAME_ALLOC) {
nghttp2_mem_free(mem, ent->nv.name);
}
fail:
return rv;
}
void nghttp2_hd_entry_free(nghttp2_hd_entry *ent, nghttp2_mem *mem) {
assert(ent->ref == 0);
if (ent->flags & NGHTTP2_HD_FLAG_NAME_ALLOC) {
nghttp2_mem_free(mem, ent->nv.name);
}
if (ent->flags & NGHTTP2_HD_FLAG_VALUE_ALLOC) {
nghttp2_mem_free(mem, ent->nv.value);
}
}
static int hd_ringbuf_init(nghttp2_hd_ringbuf *ringbuf, size_t bufsize,
nghttp2_mem *mem) {
size_t size;
for (size = 1; size < bufsize; size <<= 1)
;
ringbuf->buffer = nghttp2_mem_malloc(mem, sizeof(nghttp2_hd_entry *) * size);
if (ringbuf->buffer == NULL) {
return NGHTTP2_ERR_NOMEM;
}
ringbuf->mask = size - 1;
ringbuf->first = 0;
ringbuf->len = 0;
return 0;
}
static nghttp2_hd_entry *hd_ringbuf_get(nghttp2_hd_ringbuf *ringbuf,
size_t idx) {
assert(idx < ringbuf->len);
return ringbuf->buffer[(ringbuf->first + idx) & ringbuf->mask];
}
static int hd_ringbuf_reserve(nghttp2_hd_ringbuf *ringbuf, size_t bufsize,
nghttp2_mem *mem) {
size_t i;
size_t size;
nghttp2_hd_entry **buffer;
if (ringbuf->mask + 1 >= bufsize) {
return 0;
}
for (size = 1; size < bufsize; size <<= 1)
;
buffer = nghttp2_mem_malloc(mem, sizeof(nghttp2_hd_entry *) * size);
if (buffer == NULL) {
return NGHTTP2_ERR_NOMEM;
}
for (i = 0; i < ringbuf->len; ++i) {
buffer[i] = hd_ringbuf_get(ringbuf, i);
}
nghttp2_mem_free(mem, ringbuf->buffer);
ringbuf->buffer = buffer;
ringbuf->mask = size - 1;
ringbuf->first = 0;
return 0;
}
static void hd_ringbuf_free(nghttp2_hd_ringbuf *ringbuf, nghttp2_mem *mem) {
size_t i;
if (ringbuf == NULL) {
return;
}
for (i = 0; i < ringbuf->len; ++i) {
nghttp2_hd_entry *ent = hd_ringbuf_get(ringbuf, i);
--ent->ref;
nghttp2_hd_entry_free(ent, mem);
nghttp2_mem_free(mem, ent);
}
nghttp2_mem_free(mem, ringbuf->buffer);
}
static int hd_ringbuf_push_front(nghttp2_hd_ringbuf *ringbuf,
nghttp2_hd_entry *ent, nghttp2_mem *mem) {
int rv;
rv = hd_ringbuf_reserve(ringbuf, ringbuf->len + 1, mem);
if (rv != 0) {
return rv;
}
ringbuf->buffer[--ringbuf->first & ringbuf->mask] = ent;
++ringbuf->len;
return 0;
}
static void hd_ringbuf_pop_back(nghttp2_hd_ringbuf *ringbuf) {
assert(ringbuf->len > 0);
--ringbuf->len;
}
static int hd_context_init(nghttp2_hd_context *context, nghttp2_mem *mem) {
int rv;
context->mem = mem;
context->bad = 0;
context->hd_table_bufsize_max = NGHTTP2_HD_DEFAULT_MAX_BUFFER_SIZE;
rv = hd_ringbuf_init(&context->hd_table, context->hd_table_bufsize_max /
NGHTTP2_HD_ENTRY_OVERHEAD,
mem);
if (rv != 0) {
return rv;
}
context->hd_table_bufsize = 0;
return 0;
}
static void hd_context_free(nghttp2_hd_context *context) {
hd_ringbuf_free(&context->hd_table, context->mem);
}
int nghttp2_hd_deflate_init(nghttp2_hd_deflater *deflater, nghttp2_mem *mem) {
return nghttp2_hd_deflate_init2(
deflater, NGHTTP2_HD_DEFAULT_MAX_DEFLATE_BUFFER_SIZE, mem);
}
int nghttp2_hd_deflate_init2(nghttp2_hd_deflater *deflater,
size_t deflate_hd_table_bufsize_max,
nghttp2_mem *mem) {
int rv;
rv = hd_context_init(&deflater->ctx, mem);
if (rv != 0) {
return rv;
}
if (deflate_hd_table_bufsize_max < NGHTTP2_HD_DEFAULT_MAX_BUFFER_SIZE) {
deflater->notify_table_size_change = 1;
deflater->ctx.hd_table_bufsize_max = deflate_hd_table_bufsize_max;
} else {
deflater->notify_table_size_change = 0;
}
deflater->deflate_hd_table_bufsize_max = deflate_hd_table_bufsize_max;
deflater->min_hd_table_bufsize_max = UINT32_MAX;
return 0;
}
int nghttp2_hd_inflate_init(nghttp2_hd_inflater *inflater, nghttp2_mem *mem) {
int rv;
rv = hd_context_init(&inflater->ctx, mem);
if (rv != 0) {
goto fail;
}
inflater->settings_hd_table_bufsize_max = NGHTTP2_HD_DEFAULT_MAX_BUFFER_SIZE;
inflater->ent_keep = NULL;
inflater->nv_keep = NULL;
inflater->opcode = NGHTTP2_HD_OPCODE_NONE;
inflater->state = NGHTTP2_HD_STATE_OPCODE;
rv = nghttp2_bufs_init3(&inflater->nvbufs, NGHTTP2_HD_MAX_NV / 8, 8, 1, 0,
mem);
if (rv != 0) {
goto nvbufs_fail;
}
inflater->huffman_encoded = 0;
inflater->index = 0;
inflater->left = 0;
inflater->shift = 0;
inflater->newnamelen = 0;
inflater->index_required = 0;
inflater->no_index = 0;
return 0;
nvbufs_fail:
hd_context_free(&inflater->ctx);
fail:
return rv;
}
static void hd_inflate_keep_free(nghttp2_hd_inflater *inflater) {
nghttp2_mem *mem;
mem = inflater->ctx.mem;
if (inflater->ent_keep) {
if (inflater->ent_keep->ref == 0) {
nghttp2_hd_entry_free(inflater->ent_keep, mem);
nghttp2_mem_free(mem, inflater->ent_keep);
}
inflater->ent_keep = NULL;
}
nghttp2_mem_free(mem, inflater->nv_keep);
inflater->nv_keep = NULL;
}
void nghttp2_hd_deflate_free(nghttp2_hd_deflater *deflater) {
hd_context_free(&deflater->ctx);
}
void nghttp2_hd_inflate_free(nghttp2_hd_inflater *inflater) {
hd_inflate_keep_free(inflater);
nghttp2_bufs_free(&inflater->nvbufs);
hd_context_free(&inflater->ctx);
}
static size_t entry_room(size_t namelen, size_t valuelen) {
return NGHTTP2_HD_ENTRY_OVERHEAD + namelen + valuelen;
}
static int emit_indexed_header(nghttp2_nv *nv_out, int *token_out,
nghttp2_hd_entry *ent) {
DEBUGF(fprintf(stderr, "inflatehd: header emission: %s: %s\n", ent->nv.name,
ent->nv.value));
/* ent->ref may be 0. This happens if the encoder emits literal
block larger than header table capacity with indexing. */
*nv_out = ent->nv;
*token_out = ent->token;
return 0;
}
static int emit_literal_header(nghttp2_nv *nv_out, int *token_out,
nghttp2_nv *nv) {
DEBUGF(fprintf(stderr, "inflatehd: header emission: %s: %s\n", nv->name,
nv->value));
*nv_out = *nv;
*token_out = lookup_token(nv->name, nv->namelen);
return 0;
}
static size_t count_encoded_length(size_t n, size_t prefix) {
size_t k = (1 << prefix) - 1;
size_t len = 0;
if (n < k) {
return 1;
}
n -= k;
++len;
for (; n >= 128; n >>= 7, ++len)
;
return len + 1;
}
static size_t encode_length(uint8_t *buf, size_t n, size_t prefix) {
size_t k = (1 << prefix) - 1;
uint8_t *begin = buf;
*buf &= ~k;
if (n < k) {
*buf |= n;
return 1;
}
*buf++ |= k;
n -= k;
for (; n >= 128; n >>= 7) {
*buf++ = (1 << 7) | (n & 0x7f);
}
*buf++ = (uint8_t)n;
return (size_t)(buf - begin);
}
/*
* Decodes |prefix| prefixed integer stored from |in|. The |last|
* represents the 1 beyond the last of the valid contiguous memory
* region from |in|. The decoded integer must be less than or equal
* to UINT32_MAX.
*
* If the |initial| is nonzero, it is used as a initial value, this
* function assumes the |in| starts with intermediate data.
*
* An entire integer is decoded successfully, decoded, the |*final| is
* set to nonzero.
*
* This function stores the decoded integer in |*res| if it succeed,
* including partial decoding (in this case, number of shift to make
* in the next call will be stored in |*shift_ptr|) and returns number
* of bytes processed, or returns -1, indicating decoding error.
*/
static ssize_t decode_length(uint32_t *res, size_t *shift_ptr, int *final,
uint32_t initial, size_t shift, uint8_t *in,
uint8_t *last, size_t prefix) {
uint32_t k = (1 << prefix) - 1;
uint32_t n = initial;
uint8_t *start = in;
*shift_ptr = 0;
*final = 0;
if (n == 0) {
if ((*in & k) != k) {
*res = (*in) & k;
*final = 1;
return 1;
}
n = k;
if (++in == last) {
*res = n;
return (ssize_t)(in - start);
}
}
for (; in != last; ++in, shift += 7) {
uint32_t add = *in & 0x7f;
if ((UINT32_MAX >> shift) < add) {
DEBUGF(fprintf(stderr, "inflate: integer overflow on shift\n"));
return -1;
}
add <<= shift;
if (UINT32_MAX - add < n) {
DEBUGF(fprintf(stderr, "inflate: integer overflow on addition\n"));
return -1;
}
n += add;
if ((*in & (1 << 7)) == 0) {
break;
}
}
*shift_ptr = shift;
if (in == last) {
*res = n;
return (ssize_t)(in - start);
}
*res = n;
*final = 1;
return (ssize_t)(in + 1 - start);
}
static int emit_table_size(nghttp2_bufs *bufs, size_t table_size) {
int rv;
uint8_t *bufp;
size_t blocklen;
uint8_t sb[16];
DEBUGF(fprintf(stderr, "deflatehd: emit table_size=%zu\n", table_size));
blocklen = count_encoded_length(table_size, 5);
if (sizeof(sb) < blocklen) {
return NGHTTP2_ERR_HEADER_COMP;
}
bufp = sb;
*bufp = 0x20u;
encode_length(bufp, table_size, 5);
rv = nghttp2_bufs_add(bufs, sb, blocklen);
if (rv != 0) {
return rv;
}
return 0;
}
static int emit_indexed_block(nghttp2_bufs *bufs, size_t idx) {
int rv;
size_t blocklen;
uint8_t sb[16];
uint8_t *bufp;
blocklen = count_encoded_length(idx + 1, 7);
DEBUGF(fprintf(stderr, "deflatehd: emit indexed index=%zu, %zu bytes\n", idx,
blocklen));
if (sizeof(sb) < blocklen) {
return NGHTTP2_ERR_HEADER_COMP;
}
bufp = sb;
*bufp = 0x80u;
encode_length(bufp, idx + 1, 7);
rv = nghttp2_bufs_add(bufs, sb, blocklen);
if (rv != 0) {
return rv;
}
return 0;
}
static int emit_string(nghttp2_bufs *bufs, const uint8_t *str, size_t len) {
int rv;
uint8_t sb[16];
uint8_t *bufp;
size_t blocklen;
size_t enclen;
int huffman = 0;
enclen = nghttp2_hd_huff_encode_count(str, len);
if (enclen < len) {
huffman = 1;
} else {
enclen = len;
}
blocklen = count_encoded_length(enclen, 7);
DEBUGF(fprintf(stderr, "deflatehd: emit string str="));
DEBUGF(fwrite(str, len, 1, stderr));
DEBUGF(fprintf(stderr, ", length=%zu, huffman=%d, encoded_length=%zu\n", len,
huffman, enclen));
if (sizeof(sb) < blocklen) {
return NGHTTP2_ERR_HEADER_COMP;
}
bufp = sb;
*bufp = huffman ? 1 << 7 : 0;
encode_length(bufp, enclen, 7);
rv = nghttp2_bufs_add(bufs, sb, blocklen);
if (rv != 0) {
return rv;
}
if (huffman) {
rv = nghttp2_hd_huff_encode(bufs, str, len);
} else {
assert(enclen == len);
rv = nghttp2_bufs_add(bufs, str, len);
}
return rv;
}
static uint8_t pack_first_byte(int indexing_mode) {
switch (indexing_mode) {
case NGHTTP2_HD_WITH_INDEXING:
return 0x40u;
case NGHTTP2_HD_WITHOUT_INDEXING:
return 0;
case NGHTTP2_HD_NEVER_INDEXING:
return 0x10u;
default:
assert(0);
}
}
static int emit_indname_block(nghttp2_bufs *bufs, size_t idx,
const nghttp2_nv *nv, int indexing_mode) {
int rv;
uint8_t *bufp;
size_t blocklen;
uint8_t sb[16];
size_t prefixlen;
if (indexing_mode == NGHTTP2_HD_WITH_INDEXING) {
prefixlen = 6;
} else {
prefixlen = 4;
}
DEBUGF(fprintf(stderr, "deflatehd: emit indname index=%zu, valuelen=%zu, "
"indexing_mode=%d\n",
idx, nv->valuelen, indexing_mode));
blocklen = count_encoded_length(idx + 1, prefixlen);
if (sizeof(sb) < blocklen) {
return NGHTTP2_ERR_HEADER_COMP;
}
bufp = sb;
*bufp = pack_first_byte(indexing_mode);
encode_length(bufp, idx + 1, prefixlen);
rv = nghttp2_bufs_add(bufs, sb, blocklen);
if (rv != 0) {
return rv;
}
rv = emit_string(bufs, nv->value, nv->valuelen);
if (rv != 0) {
return rv;
}
return 0;
}
static int emit_newname_block(nghttp2_bufs *bufs, const nghttp2_nv *nv,
int indexing_mode) {
int rv;
DEBUGF(fprintf(stderr, "deflatehd: emit newname namelen=%zu, valuelen=%zu, "
"indexing_mode=%d\n",
nv->namelen, nv->valuelen, indexing_mode));
rv = nghttp2_bufs_addb(bufs, pack_first_byte(indexing_mode));
if (rv != 0) {
return rv;
}
rv = emit_string(bufs, nv->name, nv->namelen);
if (rv != 0) {
return rv;
}
rv = emit_string(bufs, nv->value, nv->valuelen);
if (rv != 0) {
return rv;
}
return 0;
}
static nghttp2_hd_entry *add_hd_table_incremental(nghttp2_hd_context *context,
const nghttp2_nv *nv,
int token,
uint8_t entry_flags) {
int rv;
nghttp2_hd_entry *new_ent;
size_t room;
nghttp2_mem *mem;
mem = context->mem;
room = entry_room(nv->namelen, nv->valuelen);
while (context->hd_table_bufsize + room > context->hd_table_bufsize_max &&
context->hd_table.len > 0) {
size_t idx = context->hd_table.len - 1;
nghttp2_hd_entry *ent = hd_ringbuf_get(&context->hd_table, idx);
context->hd_table_bufsize -= entry_room(ent->nv.namelen, ent->nv.valuelen);
DEBUGF(fprintf(stderr, "hpack: remove item from header table: %s: %s\n",
ent->nv.name, ent->nv.value));
hd_ringbuf_pop_back(&context->hd_table);
if (--ent->ref == 0) {
nghttp2_hd_entry_free(ent, mem);
nghttp2_mem_free(mem, ent);
}
}
new_ent = nghttp2_mem_malloc(mem, sizeof(nghttp2_hd_entry));
if (new_ent == NULL) {
return NULL;
}
rv = nghttp2_hd_entry_init(new_ent, entry_flags, nv->name, nv->namelen,
nv->value, nv->valuelen, token, mem);
if (rv != 0) {
nghttp2_mem_free(mem, new_ent);
return NULL;
}
if (room > context->hd_table_bufsize_max) {
/* The entry taking more than NGHTTP2_HD_MAX_BUFFER_SIZE is
immediately evicted. */
--new_ent->ref;
} else {
rv = hd_ringbuf_push_front(&context->hd_table, new_ent, mem);
if (rv != 0) {
--new_ent->ref;
if ((entry_flags & NGHTTP2_HD_FLAG_NAME_ALLOC) &&
(entry_flags & NGHTTP2_HD_FLAG_NAME_GIFT)) {
/* nv->name are managed by caller. */
new_ent->nv.name = NULL;
new_ent->nv.namelen = 0;
}
if ((entry_flags & NGHTTP2_HD_FLAG_VALUE_ALLOC) &&
(entry_flags & NGHTTP2_HD_FLAG_VALUE_GIFT)) {
/* nv->value are managed by caller. */
new_ent->nv.value = NULL;
new_ent->nv.valuelen = 0;
}
nghttp2_hd_entry_free(new_ent, mem);
nghttp2_mem_free(mem, new_ent);
return NULL;
}
context->hd_table_bufsize += room;
}
return new_ent;
}
static int name_eq(const nghttp2_nv *a, const nghttp2_nv *b) {
return a->namelen == b->namelen &&
a->name[a->namelen - 1] == b->name[a->namelen - 1] &&
memeq(a->name, b->name, a->namelen);
}
static int value_eq(const nghttp2_nv *a, const nghttp2_nv *b) {
return a->valuelen == b->valuelen &&
a->value[a->valuelen - 1] == b->value[a->valuelen - 1] &&
memeq(a->value, b->value, a->valuelen);
}
typedef struct {
ssize_t index;
/* Nonzero if both name and value are matched. */
uint8_t name_value_match;
} search_result;
static search_result search_static_table(const nghttp2_nv *nv, int token,
int indexing_mode) {
search_result res = {token, 0};
int i;
if (indexing_mode == NGHTTP2_HD_NEVER_INDEXING) {
return res;
}
for (i = token;
i <= NGHTTP2_TOKEN_WWW_AUTHENTICATE && static_table[i].token == token;
++i) {
if (value_eq(&static_table[i].nv, nv)) {
res.index = i;
res.name_value_match = 1;
return res;
}
}
return res;
}
static search_result search_hd_table(nghttp2_hd_context *context,
const nghttp2_nv *nv, int token,
int indexing_mode) {
search_result res = {-1, 0};
size_t i;
if (token >= 0 && token <= NGHTTP2_TOKEN_WWW_AUTHENTICATE) {
res = search_static_table(nv, token, indexing_mode);
if (res.name_value_match) {
return res;
}
}
/* Search dynamic table first, so that we can find recently used
entry first */
if (indexing_mode != NGHTTP2_HD_NEVER_INDEXING) {
for (i = 0; i < context->hd_table.len; ++i) {
nghttp2_hd_entry *ent = hd_ringbuf_get(&context->hd_table, i);
if (ent->token != token || (token == -1 && !name_eq(&ent->nv, nv))) {
continue;
}
if (res.index == -1) {
res.index = (ssize_t)(i + NGHTTP2_STATIC_TABLE_LENGTH);
}
if (value_eq(&ent->nv, nv)) {
res.index = (ssize_t)(i + NGHTTP2_STATIC_TABLE_LENGTH);
res.name_value_match = 1;
return res;
}
}
}
return res;
}
static void hd_context_shrink_table_size(nghttp2_hd_context *context) {
nghttp2_mem *mem;
mem = context->mem;
while (context->hd_table_bufsize > context->hd_table_bufsize_max &&
context->hd_table.len > 0) {
size_t idx = context->hd_table.len - 1;
nghttp2_hd_entry *ent = hd_ringbuf_get(&context->hd_table, idx);
context->hd_table_bufsize -= entry_room(ent->nv.namelen, ent->nv.valuelen);
hd_ringbuf_pop_back(&context->hd_table);
if (--ent->ref == 0) {
nghttp2_hd_entry_free(ent, mem);
nghttp2_mem_free(mem, ent);
}
}
}
int nghttp2_hd_deflate_change_table_size(nghttp2_hd_deflater *deflater,
size_t settings_hd_table_bufsize_max) {
size_t next_bufsize = nghttp2_min(settings_hd_table_bufsize_max,
deflater->deflate_hd_table_bufsize_max);
deflater->ctx.hd_table_bufsize_max = next_bufsize;
deflater->min_hd_table_bufsize_max =
nghttp2_min(deflater->min_hd_table_bufsize_max, next_bufsize);
deflater->notify_table_size_change = 1;
hd_context_shrink_table_size(&deflater->ctx);
return 0;
}
int nghttp2_hd_inflate_change_table_size(nghttp2_hd_inflater *inflater,
size_t settings_hd_table_bufsize_max) {
inflater->settings_hd_table_bufsize_max = settings_hd_table_bufsize_max;
inflater->ctx.hd_table_bufsize_max = settings_hd_table_bufsize_max;
hd_context_shrink_table_size(&inflater->ctx);
return 0;
}
#define INDEX_RANGE_VALID(context, idx) \
((idx) < (context)->hd_table.len + NGHTTP2_STATIC_TABLE_LENGTH)
static size_t get_max_index(nghttp2_hd_context *context) {
return context->hd_table.len + NGHTTP2_STATIC_TABLE_LENGTH - 1;
}
nghttp2_hd_entry *nghttp2_hd_table_get(nghttp2_hd_context *context,
size_t idx) {
assert(INDEX_RANGE_VALID(context, idx));
if (idx >= NGHTTP2_STATIC_TABLE_LENGTH) {
return hd_ringbuf_get(&context->hd_table,
idx - NGHTTP2_STATIC_TABLE_LENGTH);
} else {
return &static_table[idx];
}
}
static int hd_deflate_decide_indexing(nghttp2_hd_deflater *deflater,
const nghttp2_nv *nv, int token) {
if (token == NGHTTP2_TOKEN__PATH || token == NGHTTP2_TOKEN_AGE ||
token == NGHTTP2_TOKEN_CONTENT_LENGTH || token == NGHTTP2_TOKEN_ETAG ||
token == NGHTTP2_TOKEN_IF_MODIFIED_SINCE ||
token == NGHTTP2_TOKEN_IF_NONE_MATCH || token == NGHTTP2_TOKEN_LOCATION ||
token == NGHTTP2_TOKEN_SET_COOKIE ||
entry_room(nv->namelen, nv->valuelen) >
deflater->ctx.hd_table_bufsize_max * 3 / 4) {
return NGHTTP2_HD_WITHOUT_INDEXING;
}
return NGHTTP2_HD_WITH_INDEXING;
}
static int deflate_nv(nghttp2_hd_deflater *deflater, nghttp2_bufs *bufs,
const nghttp2_nv *nv) {
int rv;
search_result res;
ssize_t idx;
int indexing_mode;
int token;
nghttp2_mem *mem;
DEBUGF(fprintf(stderr, "deflatehd: deflating %s: %s\n", nv->name, nv->value));
mem = deflater->ctx.mem;
token = lookup_token(nv->name, nv->namelen);
/* Don't index authorization header field since it may contain low
entropy secret data (e.g., id/password). Also cookie header
field with less than 20 bytes value is also never indexed. This
is the same criteria used in Firefox codebase. */
indexing_mode =
token == NGHTTP2_TOKEN_AUTHORIZATION ||
(token == NGHTTP2_TOKEN_COOKIE && nv->valuelen < 20) ||
(nv->flags & NGHTTP2_NV_FLAG_NO_INDEX)
? NGHTTP2_HD_NEVER_INDEXING
: hd_deflate_decide_indexing(deflater, nv, token);
res = search_hd_table(&deflater->ctx, nv, token, indexing_mode);
idx = res.index;
if (res.name_value_match) {
DEBUGF(fprintf(stderr, "deflatehd: name/value match index=%zd\n", idx));
rv = emit_indexed_block(bufs, idx);
if (rv != 0) {
return rv;
}
return 0;
}
if (res.index != -1) {
DEBUGF(fprintf(stderr, "deflatehd: name match index=%zd\n", res.index));
}
if (indexing_mode == NGHTTP2_HD_WITH_INDEXING) {
nghttp2_hd_entry *new_ent;
if (idx != -1 && idx < (ssize_t)NGHTTP2_STATIC_TABLE_LENGTH) {
nghttp2_nv nv_indname;
nv_indname = *nv;
nv_indname.name = nghttp2_hd_table_get(&deflater->ctx, idx)->nv.name;
new_ent = add_hd_table_incremental(&deflater->ctx, &nv_indname, token,
NGHTTP2_HD_FLAG_VALUE_ALLOC);
} else {
new_ent = add_hd_table_incremental(&deflater->ctx, nv, token,
NGHTTP2_HD_FLAG_NAME_ALLOC |
NGHTTP2_HD_FLAG_VALUE_ALLOC);
}
if (!new_ent) {
return NGHTTP2_ERR_HEADER_COMP;
}
if (new_ent->ref == 0) {
nghttp2_hd_entry_free(new_ent, mem);
nghttp2_mem_free(mem, new_ent);
}
}
if (idx == -1) {
rv = emit_newname_block(bufs, nv, indexing_mode);
} else {
rv = emit_indname_block(bufs, idx, nv, indexing_mode);
}
if (rv != 0) {
return rv;
}
return 0;
}
int nghttp2_hd_deflate_hd_bufs(nghttp2_hd_deflater *deflater,
nghttp2_bufs *bufs, const nghttp2_nv *nv,
size_t nvlen) {
size_t i;
int rv = 0;
if (deflater->ctx.bad) {
return NGHTTP2_ERR_HEADER_COMP;
}
if (deflater->notify_table_size_change) {
size_t min_hd_table_bufsize_max;
min_hd_table_bufsize_max = deflater->min_hd_table_bufsize_max;
deflater->notify_table_size_change = 0;
deflater->min_hd_table_bufsize_max = UINT32_MAX;
if (deflater->ctx.hd_table_bufsize_max > min_hd_table_bufsize_max) {
rv = emit_table_size(bufs, min_hd_table_bufsize_max);
if (rv != 0) {
goto fail;
}
}
rv = emit_table_size(bufs, deflater->ctx.hd_table_bufsize_max);
if (rv != 0) {
goto fail;
}
}
for (i = 0; i < nvlen; ++i) {
rv = deflate_nv(deflater, bufs, &nv[i]);
if (rv != 0) {
goto fail;
}
}
DEBUGF(
fprintf(stderr, "deflatehd: all input name/value pairs were deflated\n"));
return 0;
fail:
DEBUGF(fprintf(stderr, "deflatehd: error return %d\n", rv));
deflater->ctx.bad = 1;
return rv;
}
ssize_t nghttp2_hd_deflate_hd(nghttp2_hd_deflater *deflater, uint8_t *buf,
size_t buflen, const nghttp2_nv *nv,
size_t nvlen) {
nghttp2_bufs bufs;
int rv;
nghttp2_mem *mem;
mem = deflater->ctx.mem;
rv = nghttp2_bufs_wrap_init(&bufs, buf, buflen, mem);
if (rv != 0) {
return rv;
}
rv = nghttp2_hd_deflate_hd_bufs(deflater, &bufs, nv, nvlen);
buflen = nghttp2_bufs_len(&bufs);
nghttp2_bufs_wrap_free(&bufs);
if (rv == NGHTTP2_ERR_BUFFER_ERROR) {
return NGHTTP2_ERR_INSUFF_BUFSIZE;
}
if (rv != 0) {
return rv;
}
return (ssize_t)buflen;
}
size_t nghttp2_hd_deflate_bound(nghttp2_hd_deflater *deflater _U_,
const nghttp2_nv *nva, size_t nvlen) {
size_t n = 0;
size_t i;
/* Possible Maximum Header Table Size Change. Encoding (1u << 31) -
1 using 4 bit prefix requires 6 bytes. We may emit this at most
twice. */
n += 12;
/* Use Literal Header Field without indexing - New Name, since it is
most space consuming format. Also we choose the less one between
non-huffman and huffman, so using literal byte count is
sufficient for upper bound.
Encoding (1u << 31) - 1 using 7 bit prefix requires 6 bytes. We
need 2 of this for |nvlen| header fields. */
n += 6 * 2 * nvlen;
for (i = 0; i < nvlen; ++i) {
n += nva[i].namelen + nva[i].valuelen;
}
return n;
}
int nghttp2_hd_deflate_new(nghttp2_hd_deflater **deflater_ptr,
size_t deflate_hd_table_bufsize_max) {
return nghttp2_hd_deflate_new2(deflater_ptr, deflate_hd_table_bufsize_max,
NULL);
}
int nghttp2_hd_deflate_new2(nghttp2_hd_deflater **deflater_ptr,
size_t deflate_hd_table_bufsize_max,
nghttp2_mem *mem) {
int rv;
nghttp2_hd_deflater *deflater;
if (mem == NULL) {
mem = nghttp2_mem_default();
}
deflater = nghttp2_mem_malloc(mem, sizeof(nghttp2_hd_deflater));
if (deflater == NULL) {
return NGHTTP2_ERR_NOMEM;
}
rv = nghttp2_hd_deflate_init2(deflater, deflate_hd_table_bufsize_max, mem);
if (rv != 0) {
nghttp2_mem_free(mem, deflater);
return rv;
}
*deflater_ptr = deflater;
return 0;
}
void nghttp2_hd_deflate_del(nghttp2_hd_deflater *deflater) {
nghttp2_mem *mem;
mem = deflater->ctx.mem;
nghttp2_hd_deflate_free(deflater);
nghttp2_mem_free(mem, deflater);
}
static void hd_inflate_set_huffman_encoded(nghttp2_hd_inflater *inflater,
const uint8_t *in) {
inflater->huffman_encoded = (*in & (1 << 7)) != 0;
}
/*
* Decodes the integer from the range [in, last). The result is
* assigned to |inflater->left|. If the |inflater->left| is 0, then
* it performs variable integer decoding from scratch. Otherwise, it
* uses the |inflater->left| as the initial value and continues to
* decode assuming that [in, last) begins with intermediary sequence.
*
* This function returns the number of bytes read if it succeeds, or
* one of the following negative error codes:
*
* NGHTTP2_ERR_HEADER_COMP
* Integer decoding failed
*/
static ssize_t hd_inflate_read_len(nghttp2_hd_inflater *inflater, int *rfin,
uint8_t *in, uint8_t *last, size_t prefix,
size_t maxlen) {
ssize_t rv;
uint32_t out;
*rfin = 0;
rv = decode_length(&out, &inflater->shift, rfin, (uint32_t)inflater->left,
inflater->shift, in, last, prefix);
if (rv == -1) {
DEBUGF(fprintf(stderr, "inflatehd: integer decoding failed\n"));
return NGHTTP2_ERR_HEADER_COMP;
}
if (out > maxlen) {
DEBUGF(fprintf(
stderr, "inflatehd: integer exceeded the maximum value %zu\n", maxlen));
return NGHTTP2_ERR_HEADER_COMP;
}
inflater->left = out;
DEBUGF(fprintf(stderr, "inflatehd: decoded integer is %u\n", out));
return rv;
}
/*
* Reads |inflater->left| bytes from the range [in, last) and performs
* huffman decoding against them and pushes the result into the
* |buffer|.
*
* This function returns the number of bytes read if it succeeds, or
* one of the following negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory
* NGHTTP2_ERR_HEADER_COMP
* Huffman decoding failed
* NGHTTP2_ERR_BUFFER_ERROR
* Out of buffer space.
*/
static ssize_t hd_inflate_read_huff(nghttp2_hd_inflater *inflater,
nghttp2_bufs *bufs, uint8_t *in,
uint8_t *last) {
ssize_t readlen;
int final = 0;
if ((size_t)(last - in) >= inflater->left) {
last = in + inflater->left;
final = 1;
}
readlen = nghttp2_hd_huff_decode(&inflater->huff_decode_ctx, bufs, in,
last - in, final);
if (readlen < 0) {
DEBUGF(fprintf(stderr, "inflatehd: huffman decoding failed\n"));
return readlen;
}
inflater->left -= (size_t)readlen;
return readlen;
}
/*
* Reads |inflater->left| bytes from the range [in, last) and copies
* them into the |buffer|.
*
* This function returns the number of bytes read if it succeeds, or
* one of the following negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory
* NGHTTP2_ERR_HEADER_COMP
* Header decompression failed
* NGHTTP2_ERR_BUFFER_ERROR
* Out of buffer space.
*/
static ssize_t hd_inflate_read(nghttp2_hd_inflater *inflater,
nghttp2_bufs *bufs, uint8_t *in, uint8_t *last) {
int rv;
size_t len = nghttp2_min((size_t)(last - in), inflater->left);
rv = nghttp2_bufs_add(bufs, in, len);
if (rv != 0) {
return rv;
}
inflater->left -= len;
return (ssize_t)len;
}
/*
* Finalize indexed header representation reception. If header is
* emitted, |*nv_out| is filled with that value and 0 is returned. If
* no header is emitted, 1 is returned.
*
* This function returns either 0 or 1 if it succeeds, or one of the
* following negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory
*/
static int hd_inflate_commit_indexed(nghttp2_hd_inflater *inflater,
nghttp2_nv *nv_out, int *token_out) {
nghttp2_hd_entry *ent = nghttp2_hd_table_get(&inflater->ctx, inflater->index);
emit_indexed_header(nv_out, token_out, ent);
return 0;
}
static int hd_inflate_remove_bufs(nghttp2_hd_inflater *inflater, nghttp2_nv *nv,
int value_only) {
ssize_t rv;
size_t buflen;
uint8_t *buf;
nghttp2_buf *pbuf;
if (inflater->index_required ||
inflater->nvbufs.head != inflater->nvbufs.cur) {
rv = nghttp2_bufs_remove(&inflater->nvbufs, &buf);
if (rv < 0) {
return NGHTTP2_ERR_NOMEM;
}
nghttp2_bufs_reset(&inflater->nvbufs);
buflen = rv;
if (value_only) {
/* we don't use this value, so no need to NULL-terminate */
nv->name = NULL;
nv->namelen = 0;
nv->value = buf;
nv->valuelen = buflen - 1;
} else {
nv->name = buf;
nv->namelen = inflater->newnamelen;
nv->value = buf + nv->namelen + 1;
nv->valuelen = buflen - nv->namelen - 2;
}
return 0;
}
/* If we are not going to store header in header table and
name/value are in first chunk, we just refer them from nv,
instead of mallocing another memory. */
pbuf = &inflater->nvbufs.head->buf;
if (value_only) {
/* we don't use this value, so no need to NULL-terminate */
nv->name = NULL;
nv->namelen = 0;
nv->value = pbuf->pos;
nv->valuelen = nghttp2_buf_len(pbuf) - 1;
} else {
nv->name = pbuf->pos;
nv->namelen = inflater->newnamelen;
nv->value = pbuf->pos + nv->namelen + 1;
nv->valuelen = nghttp2_buf_len(pbuf) - nv->namelen - 2;
}
/* Resetting does not change the content of first buffer */
nghttp2_bufs_reset(&inflater->nvbufs);
return 0;
}
/*
* Finalize literal header representation - new name- reception. If
* header is emitted, |*nv_out| is filled with that value and 0 is
* returned.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory
*/
static int hd_inflate_commit_newname(nghttp2_hd_inflater *inflater,
nghttp2_nv *nv_out, int *token_out) {
int rv;
nghttp2_nv nv;
nghttp2_mem *mem;
mem = inflater->ctx.mem;
rv = hd_inflate_remove_bufs(inflater, &nv, 0 /* name and value */);
if (rv != 0) {
return NGHTTP2_ERR_NOMEM;
}
if (inflater->no_index) {
nv.flags = NGHTTP2_NV_FLAG_NO_INDEX;
} else {
nv.flags = NGHTTP2_NV_FLAG_NONE;
}
if (inflater->index_required) {
nghttp2_hd_entry *new_ent;
uint8_t ent_flags;
/* nv->value points to the middle of the buffer pointed by
nv->name. So we just need to keep track of nv->name for memory
management. */
ent_flags = NGHTTP2_HD_FLAG_NAME_ALLOC | NGHTTP2_HD_FLAG_NAME_GIFT;
new_ent = add_hd_table_incremental(
&inflater->ctx, &nv, lookup_token(nv.name, nv.namelen), ent_flags);
if (new_ent) {
emit_indexed_header(nv_out, token_out, new_ent);
inflater->ent_keep = new_ent;
return 0;
}
nghttp2_mem_free(mem, nv.name);
return NGHTTP2_ERR_NOMEM;
}
emit_literal_header(nv_out, token_out, &nv);
if (nv.name != inflater->nvbufs.head->buf.pos) {
inflater->nv_keep = nv.name;
}
return 0;
}
/*
* Finalize literal header representation - indexed name-
* reception. If header is emitted, |*nv_out| is filled with that
* value and 0 is returned.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGHTTP2_ERR_NOMEM
* Out of memory
*/
static int hd_inflate_commit_indname(nghttp2_hd_inflater *inflater,
nghttp2_nv *nv_out, int *token_out) {
int rv;
nghttp2_nv nv;
nghttp2_hd_entry *ent_name;
nghttp2_mem *mem;
mem = inflater->ctx.mem;
rv = hd_inflate_remove_bufs(inflater, &nv, 1 /* value only */);
if (rv != 0) {
return NGHTTP2_ERR_NOMEM;
}
if (inflater->no_index) {
nv.flags = NGHTTP2_NV_FLAG_NO_INDEX;
} else {
nv.flags = NGHTTP2_NV_FLAG_NONE;
}
ent_name = nghttp2_hd_table_get(&inflater->ctx, inflater->index);
nv.name = ent_name->nv.name;
nv.namelen = ent_name->nv.namelen;
if (inflater->index_required) {
nghttp2_hd_entry *new_ent;
uint8_t ent_flags;
int static_name;
ent_flags = NGHTTP2_HD_FLAG_VALUE_ALLOC | NGHTTP2_HD_FLAG_VALUE_GIFT;
static_name = inflater->index < NGHTTP2_STATIC_TABLE_LENGTH;
if (!static_name) {
ent_flags |= NGHTTP2_HD_FLAG_NAME_ALLOC;
/* For entry in static table, we must not touch ref, because it
is shared by threads */
++ent_name->ref;
}
new_ent = add_hd_table_incremental(&inflater->ctx, &nv, ent_name->token,
ent_flags);
if (!static_name && --ent_name->ref == 0) {
nghttp2_hd_entry_free(ent_name, mem);
nghttp2_mem_free(mem, ent_name);
}
if (new_ent) {
emit_indexed_header(nv_out, token_out, new_ent);
inflater->ent_keep = new_ent;
return 0;
}
nghttp2_mem_free(mem, nv.value);
return NGHTTP2_ERR_NOMEM;
}
emit_literal_header(nv_out, token_out, &nv);
if (nv.value != inflater->nvbufs.head->buf.pos) {
inflater->nv_keep = nv.value;
}
return 0;
}
ssize_t nghttp2_hd_inflate_hd(nghttp2_hd_inflater *inflater, nghttp2_nv *nv_out,
int *inflate_flags, uint8_t *in, size_t inlen,
int in_final) {
int token;
return nghttp2_hd_inflate_hd2(inflater, nv_out, inflate_flags, &token, in,
inlen, in_final);
}
ssize_t nghttp2_hd_inflate_hd2(nghttp2_hd_inflater *inflater,
nghttp2_nv *nv_out, int *inflate_flags,
int *token_out, uint8_t *in, size_t inlen,
int in_final) {
ssize_t rv = 0;
uint8_t *first = in;
uint8_t *last = in + inlen;
int rfin = 0;
int busy = 0;
if (inflater->ctx.bad) {
return NGHTTP2_ERR_HEADER_COMP;
}
DEBUGF(fprintf(stderr, "inflatehd: start state=%d\n", inflater->state));
hd_inflate_keep_free(inflater);
*token_out = -1;
*inflate_flags = NGHTTP2_HD_INFLATE_NONE;
for (; in != last || busy;) {
busy = 0;
switch (inflater->state) {
case NGHTTP2_HD_STATE_OPCODE:
if ((*in & 0xe0u) == 0x20u) {
DEBUGF(fprintf(stderr, "inflatehd: header table size change\n"));
inflater->opcode = NGHTTP2_HD_OPCODE_INDEXED;
inflater->state = NGHTTP2_HD_STATE_READ_TABLE_SIZE;
} else if (*in & 0x80u) {
DEBUGF(fprintf(stderr, "inflatehd: indexed repr\n"));
inflater->opcode = NGHTTP2_HD_OPCODE_INDEXED;
inflater->state = NGHTTP2_HD_STATE_READ_INDEX;
} else {
if (*in == 0x40u || *in == 0 || *in == 0x10u) {
DEBUGF(
fprintf(stderr, "inflatehd: literal header repr - new name\n"));
inflater->opcode = NGHTTP2_HD_OPCODE_NEWNAME;
inflater->state = NGHTTP2_HD_STATE_NEWNAME_CHECK_NAMELEN;
} else {
DEBUGF(fprintf(stderr,
"inflatehd: literal header repr - indexed name\n"));
inflater->opcode = NGHTTP2_HD_OPCODE_INDNAME;
inflater->state = NGHTTP2_HD_STATE_READ_INDEX;
}
inflater->index_required = (*in & 0x40) != 0;
inflater->no_index = (*in & 0xf0u) == 0x10u;
DEBUGF(fprintf(stderr, "inflatehd: indexing required=%d, no_index=%d\n",
inflater->index_required, inflater->no_index));
if (inflater->opcode == NGHTTP2_HD_OPCODE_NEWNAME) {
++in;
}
}
inflater->left = 0;
inflater->shift = 0;
break;
case NGHTTP2_HD_STATE_READ_TABLE_SIZE:
rfin = 0;
rv = hd_inflate_read_len(inflater, &rfin, in, last, 5,
inflater->settings_hd_table_bufsize_max);
if (rv < 0) {
goto fail;
}
in += rv;
if (!rfin) {
goto almost_ok;
}
DEBUGF(fprintf(stderr, "inflatehd: table_size=%zu\n", inflater->left));
inflater->ctx.hd_table_bufsize_max = inflater->left;
hd_context_shrink_table_size(&inflater->ctx);
inflater->state = NGHTTP2_HD_STATE_OPCODE;
break;
case NGHTTP2_HD_STATE_READ_INDEX: {
size_t prefixlen;
if (inflater->opcode == NGHTTP2_HD_OPCODE_INDEXED) {
prefixlen = 7;
} else if (inflater->index_required) {
prefixlen = 6;
} else {
prefixlen = 4;
}
rfin = 0;
rv = hd_inflate_read_len(inflater, &rfin, in, last, prefixlen,
get_max_index(&inflater->ctx) + 1);
if (rv < 0) {
goto fail;
}
in += rv;
if (!rfin) {
goto almost_ok;
}
if (inflater->left == 0) {
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
DEBUGF(fprintf(stderr, "inflatehd: index=%zu\n", inflater->left));
if (inflater->opcode == NGHTTP2_HD_OPCODE_INDEXED) {
inflater->index = inflater->left;
--inflater->index;
rv = hd_inflate_commit_indexed(inflater, nv_out, token_out);
if (rv < 0) {
goto fail;
}
inflater->state = NGHTTP2_HD_STATE_OPCODE;
/* If rv == 1, no header was emitted */
if (rv == 0) {
*inflate_flags |= NGHTTP2_HD_INFLATE_EMIT;
return (ssize_t)(in - first);
}
} else {
inflater->index = inflater->left;
--inflater->index;
inflater->state = NGHTTP2_HD_STATE_CHECK_VALUELEN;
}
break;
}
case NGHTTP2_HD_STATE_NEWNAME_CHECK_NAMELEN:
hd_inflate_set_huffman_encoded(inflater, in);
inflater->state = NGHTTP2_HD_STATE_NEWNAME_READ_NAMELEN;
inflater->left = 0;
inflater->shift = 0;
DEBUGF(fprintf(stderr, "inflatehd: huffman encoded=%d\n",
inflater->huffman_encoded != 0));
/* Fall through */
case NGHTTP2_HD_STATE_NEWNAME_READ_NAMELEN:
rfin = 0;
rv = hd_inflate_read_len(inflater, &rfin, in, last, 7, NGHTTP2_HD_MAX_NV);
if (rv < 0) {
goto fail;
}
in += rv;
if (!rfin) {
DEBUGF(fprintf(stderr,
"inflatehd: integer not fully decoded. current=%zu\n",
inflater->left));
goto almost_ok;
}
if (inflater->huffman_encoded) {
nghttp2_hd_huff_decode_context_init(&inflater->huff_decode_ctx);
inflater->state = NGHTTP2_HD_STATE_NEWNAME_READ_NAMEHUFF;
} else {
inflater->state = NGHTTP2_HD_STATE_NEWNAME_READ_NAME;
}
break;
case NGHTTP2_HD_STATE_NEWNAME_READ_NAMEHUFF:
rv = hd_inflate_read_huff(inflater, &inflater->nvbufs, in, last);
if (rv < 0) {
goto fail;
}
in += rv;
DEBUGF(fprintf(stderr, "inflatehd: %zd bytes read\n", rv));
if (inflater->left) {
DEBUGF(fprintf(stderr, "inflatehd: still %zu bytes to go\n",
inflater->left));
goto almost_ok;
}
inflater->newnamelen = nghttp2_bufs_len(&inflater->nvbufs);
rv = nghttp2_bufs_addb(&inflater->nvbufs, '\0');
if (rv != 0) {
goto fail;
}
inflater->state = NGHTTP2_HD_STATE_CHECK_VALUELEN;
break;
case NGHTTP2_HD_STATE_NEWNAME_READ_NAME:
rv = hd_inflate_read(inflater, &inflater->nvbufs, in, last);
if (rv < 0) {
goto fail;
}
in += rv;
DEBUGF(fprintf(stderr, "inflatehd: %zd bytes read\n", rv));
if (inflater->left) {
DEBUGF(fprintf(stderr, "inflatehd: still %zu bytes to go\n",
inflater->left));
goto almost_ok;
}
inflater->newnamelen = nghttp2_bufs_len(&inflater->nvbufs);
rv = nghttp2_bufs_addb(&inflater->nvbufs, '\0');
if (rv != 0) {
goto fail;
}
inflater->state = NGHTTP2_HD_STATE_CHECK_VALUELEN;
break;
case NGHTTP2_HD_STATE_CHECK_VALUELEN:
hd_inflate_set_huffman_encoded(inflater, in);
inflater->state = NGHTTP2_HD_STATE_READ_VALUELEN;
inflater->left = 0;
inflater->shift = 0;
DEBUGF(fprintf(stderr, "inflatehd: huffman encoded=%d\n",
inflater->huffman_encoded != 0));
/* Fall through */
case NGHTTP2_HD_STATE_READ_VALUELEN:
rfin = 0;
rv = hd_inflate_read_len(inflater, &rfin, in, last, 7, NGHTTP2_HD_MAX_NV);
if (rv < 0) {
goto fail;
}
in += rv;
if (!rfin) {
goto almost_ok;
}
DEBUGF(fprintf(stderr, "inflatehd: valuelen=%zu\n", inflater->left));
if (inflater->huffman_encoded) {
nghttp2_hd_huff_decode_context_init(&inflater->huff_decode_ctx);
inflater->state = NGHTTP2_HD_STATE_READ_VALUEHUFF;
} else {
inflater->state = NGHTTP2_HD_STATE_READ_VALUE;
}
busy = 1;
break;
case NGHTTP2_HD_STATE_READ_VALUEHUFF:
rv = hd_inflate_read_huff(inflater, &inflater->nvbufs, in, last);
if (rv < 0) {
goto fail;
}
in += rv;
DEBUGF(fprintf(stderr, "inflatehd: %zd bytes read\n", rv));
if (inflater->left) {
DEBUGF(fprintf(stderr, "inflatehd: still %zu bytes to go\n",
inflater->left));
goto almost_ok;
}
rv = nghttp2_bufs_addb(&inflater->nvbufs, '\0');
if (rv != 0) {
goto fail;
}
if (inflater->opcode == NGHTTP2_HD_OPCODE_NEWNAME) {
rv = hd_inflate_commit_newname(inflater, nv_out, token_out);
} else {
rv = hd_inflate_commit_indname(inflater, nv_out, token_out);
}
if (rv != 0) {
goto fail;
}
inflater->state = NGHTTP2_HD_STATE_OPCODE;
*inflate_flags |= NGHTTP2_HD_INFLATE_EMIT;
return (ssize_t)(in - first);
case NGHTTP2_HD_STATE_READ_VALUE:
rv = hd_inflate_read(inflater, &inflater->nvbufs, in, last);
if (rv < 0) {
DEBUGF(fprintf(stderr, "inflatehd: value read failure %zd: %s\n", rv,
nghttp2_strerror((int)rv)));
goto fail;
}
in += rv;
DEBUGF(fprintf(stderr, "inflatehd: %zd bytes read\n", rv));
if (inflater->left) {
DEBUGF(fprintf(stderr, "inflatehd: still %zu bytes to go\n",
inflater->left));
goto almost_ok;
}
rv = nghttp2_bufs_addb(&inflater->nvbufs, '\0');
if (rv != 0) {
goto fail;
}
if (inflater->opcode == NGHTTP2_HD_OPCODE_NEWNAME) {
rv = hd_inflate_commit_newname(inflater, nv_out, token_out);
} else {
rv = hd_inflate_commit_indname(inflater, nv_out, token_out);
}
if (rv != 0) {
goto fail;
}
inflater->state = NGHTTP2_HD_STATE_OPCODE;
*inflate_flags |= NGHTTP2_HD_INFLATE_EMIT;
return (ssize_t)(in - first);
}
}
assert(in == last);
DEBUGF(fprintf(stderr, "inflatehd: all input bytes were processed\n"));
if (in_final) {
DEBUGF(fprintf(stderr, "inflatehd: in_final set\n"));
if (inflater->state != NGHTTP2_HD_STATE_OPCODE) {
DEBUGF(fprintf(stderr, "inflatehd: unacceptable state=%d\n",
inflater->state));
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
*inflate_flags |= NGHTTP2_HD_INFLATE_FINAL;
}
return (ssize_t)(in - first);
almost_ok:
if (in_final && inflater->state != NGHTTP2_HD_STATE_OPCODE) {
DEBUGF(fprintf(stderr, "inflatehd: input ended prematurely\n"));
rv = NGHTTP2_ERR_HEADER_COMP;
goto fail;
}
return (ssize_t)(in - first);
fail:
DEBUGF(fprintf(stderr, "inflatehd: error return %zd\n", rv));
inflater->ctx.bad = 1;
return rv;
}
int nghttp2_hd_inflate_end_headers(nghttp2_hd_inflater *inflater) {
hd_inflate_keep_free(inflater);
return 0;
}
int nghttp2_hd_inflate_new(nghttp2_hd_inflater **inflater_ptr) {
return nghttp2_hd_inflate_new2(inflater_ptr, NULL);
}
int nghttp2_hd_inflate_new2(nghttp2_hd_inflater **inflater_ptr,
nghttp2_mem *mem) {
int rv;
nghttp2_hd_inflater *inflater;
if (mem == NULL) {
mem = nghttp2_mem_default();
}
inflater = nghttp2_mem_malloc(mem, sizeof(nghttp2_hd_inflater));
if (inflater == NULL) {
return NGHTTP2_ERR_NOMEM;
}
rv = nghttp2_hd_inflate_init(inflater, mem);
if (rv != 0) {
nghttp2_mem_free(mem, inflater);
return rv;
}
*inflater_ptr = inflater;
return 0;
}
void nghttp2_hd_inflate_del(nghttp2_hd_inflater *inflater) {
nghttp2_mem *mem;
mem = inflater->ctx.mem;
nghttp2_hd_inflate_free(inflater);
nghttp2_mem_free(mem, inflater);
}
int nghttp2_hd_emit_indname_block(nghttp2_bufs *bufs, size_t idx,
nghttp2_nv *nv, int indexing_mode) {
return emit_indname_block(bufs, idx, nv, indexing_mode);
}
int nghttp2_hd_emit_newname_block(nghttp2_bufs *bufs, nghttp2_nv *nv,
int indexing_mode) {
return emit_newname_block(bufs, nv, indexing_mode);
}
int nghttp2_hd_emit_table_size(nghttp2_bufs *bufs, size_t table_size) {
return emit_table_size(bufs, table_size);
}
ssize_t nghttp2_hd_decode_length(uint32_t *res, size_t *shift_ptr, int *final,
uint32_t initial, size_t shift, uint8_t *in,
uint8_t *last, size_t prefix) {
return decode_length(res, shift_ptr, final, initial, shift, in, last, prefix);
}
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