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/*
* Copyright (C) Nginx, Inc.
* Copyright (C) Valentin V. Bartenev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#define NGX_HTTP_V2_TABLE_SIZE 4096
static ngx_int_t ngx_http_v2_table_account(ngx_http_v2_connection_t *h2c,
size_t size);
static ngx_http_v2_header_t ngx_http_v2_static_table[] = {
{ ngx_string(":authority"), ngx_string("") },
{ ngx_string(":method"), ngx_string("GET") },
{ ngx_string(":method"), ngx_string("POST") },
{ ngx_string(":path"), ngx_string("/") },
{ ngx_string(":path"), ngx_string("/index.html") },
{ ngx_string(":scheme"), ngx_string("http") },
{ ngx_string(":scheme"), ngx_string("https") },
{ ngx_string(":status"), ngx_string("200") },
{ ngx_string(":status"), ngx_string("204") },
{ ngx_string(":status"), ngx_string("206") },
{ ngx_string(":status"), ngx_string("304") },
{ ngx_string(":status"), ngx_string("400") },
{ ngx_string(":status"), ngx_string("404") },
{ ngx_string(":status"), ngx_string("500") },
{ ngx_string("accept-charset"), ngx_string("") },
{ ngx_string("accept-encoding"), ngx_string("gzip, deflate") },
{ ngx_string("accept-language"), ngx_string("") },
{ ngx_string("accept-ranges"), ngx_string("") },
{ ngx_string("accept"), ngx_string("") },
{ ngx_string("access-control-allow-origin"), ngx_string("") },
{ ngx_string("age"), ngx_string("") },
{ ngx_string("allow"), ngx_string("") },
{ ngx_string("authorization"), ngx_string("") },
{ ngx_string("cache-control"), ngx_string("") },
{ ngx_string("content-disposition"), ngx_string("") },
{ ngx_string("content-encoding"), ngx_string("") },
{ ngx_string("content-language"), ngx_string("") },
{ ngx_string("content-length"), ngx_string("") },
{ ngx_string("content-location"), ngx_string("") },
{ ngx_string("content-range"), ngx_string("") },
{ ngx_string("content-type"), ngx_string("") },
{ ngx_string("cookie"), ngx_string("") },
{ ngx_string("date"), ngx_string("") },
{ ngx_string("etag"), ngx_string("") },
{ ngx_string("expect"), ngx_string("") },
{ ngx_string("expires"), ngx_string("") },
{ ngx_string("from"), ngx_string("") },
{ ngx_string("host"), ngx_string("") },
{ ngx_string("if-match"), ngx_string("") },
{ ngx_string("if-modified-since"), ngx_string("") },
{ ngx_string("if-none-match"), ngx_string("") },
{ ngx_string("if-range"), ngx_string("") },
{ ngx_string("if-unmodified-since"), ngx_string("") },
{ ngx_string("last-modified"), ngx_string("") },
{ ngx_string("link"), ngx_string("") },
{ ngx_string("location"), ngx_string("") },
{ ngx_string("max-forwards"), ngx_string("") },
{ ngx_string("proxy-authenticate"), ngx_string("") },
{ ngx_string("proxy-authorization"), ngx_string("") },
{ ngx_string("range"), ngx_string("") },
{ ngx_string("referer"), ngx_string("") },
{ ngx_string("refresh"), ngx_string("") },
{ ngx_string("retry-after"), ngx_string("") },
{ ngx_string("server"), ngx_string("") },
{ ngx_string("set-cookie"), ngx_string("") },
{ ngx_string("strict-transport-security"), ngx_string("") },
{ ngx_string("transfer-encoding"), ngx_string("") },
{ ngx_string("user-agent"), ngx_string("") },
{ ngx_string("vary"), ngx_string("") },
{ ngx_string("via"), ngx_string("") },
{ ngx_string("www-authenticate"), ngx_string("") },
};
#define NGX_HTTP_V2_STATIC_TABLE_ENTRIES \
(sizeof(ngx_http_v2_static_table) \
/ sizeof(ngx_http_v2_header_t))
ngx_int_t
ngx_http_v2_get_indexed_header(ngx_http_v2_connection_t *h2c, ngx_uint_t index,
ngx_uint_t name_only)
{
u_char *p;
size_t rest;
ngx_http_v2_header_t *entry;
if (index == 0) {
ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
"client sent invalid hpack table index 0");
return NGX_ERROR;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
"http2 get indexed %s: %ui",
name_only ? "header" : "header name", index);
index--;
if (index < NGX_HTTP_V2_STATIC_TABLE_ENTRIES) {
h2c->state.header = ngx_http_v2_static_table[index];
return NGX_OK;
}
index -= NGX_HTTP_V2_STATIC_TABLE_ENTRIES;
if (index < h2c->hpack.added - h2c->hpack.deleted) {
index = (h2c->hpack.added - index - 1) % h2c->hpack.allocated;
entry = h2c->hpack.entries[index];
p = ngx_pnalloc(h2c->state.pool, entry->name.len + 1);
if (p == NULL) {
return NGX_ERROR;
}
h2c->state.header.name.len = entry->name.len;
h2c->state.header.name.data = p;
rest = h2c->hpack.storage + NGX_HTTP_V2_TABLE_SIZE - entry->name.data;
if (entry->name.len > rest) {
p = ngx_cpymem(p, entry->name.data, rest);
p = ngx_cpymem(p, h2c->hpack.storage, entry->name.len - rest);
} else {
p = ngx_cpymem(p, entry->name.data, entry->name.len);
}
*p = '\0';
if (name_only) {
return NGX_OK;
}
p = ngx_pnalloc(h2c->state.pool, entry->value.len + 1);
if (p == NULL) {
return NGX_ERROR;
}
h2c->state.header.value.len = entry->value.len;
h2c->state.header.value.data = p;
rest = h2c->hpack.storage + NGX_HTTP_V2_TABLE_SIZE - entry->value.data;
if (entry->value.len > rest) {
p = ngx_cpymem(p, entry->value.data, rest);
p = ngx_cpymem(p, h2c->hpack.storage, entry->value.len - rest);
} else {
p = ngx_cpymem(p, entry->value.data, entry->value.len);
}
*p = '\0';
return NGX_OK;
}
ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
"client sent out of bound hpack table index: %ui", index);
return NGX_ERROR;
}
ngx_int_t
ngx_http_v2_add_header(ngx_http_v2_connection_t *h2c,
ngx_http_v2_header_t *header)
{
size_t avail;
ngx_uint_t index;
ngx_http_v2_header_t *entry, **entries;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
"http2 add header to hpack table: \"%V: %V\"",
&header->name, &header->value);
if (h2c->hpack.entries == NULL) {
h2c->hpack.allocated = 64;
h2c->hpack.size = NGX_HTTP_V2_TABLE_SIZE;
h2c->hpack.free = NGX_HTTP_V2_TABLE_SIZE;
h2c->hpack.entries = ngx_palloc(h2c->connection->pool,
sizeof(ngx_http_v2_header_t *)
* h2c->hpack.allocated);
if (h2c->hpack.entries == NULL) {
return NGX_ERROR;
}
h2c->hpack.storage = ngx_palloc(h2c->connection->pool,
h2c->hpack.free);
if (h2c->hpack.storage == NULL) {
return NGX_ERROR;
}
h2c->hpack.pos = h2c->hpack.storage;
}
if (ngx_http_v2_table_account(h2c, header->name.len + header->value.len)
!= NGX_OK)
{
return NGX_OK;
}
if (h2c->hpack.reused == h2c->hpack.deleted) {
entry = ngx_palloc(h2c->connection->pool, sizeof(ngx_http_v2_header_t));
if (entry == NULL) {
return NGX_ERROR;
}
} else {
entry = h2c->hpack.entries[h2c->hpack.reused++ % h2c->hpack.allocated];
}
avail = h2c->hpack.storage + NGX_HTTP_V2_TABLE_SIZE - h2c->hpack.pos;
entry->name.len = header->name.len;
entry->name.data = h2c->hpack.pos;
if (avail >= header->name.len) {
h2c->hpack.pos = ngx_cpymem(h2c->hpack.pos, header->name.data,
header->name.len);
} else {
ngx_memcpy(h2c->hpack.pos, header->name.data, avail);
h2c->hpack.pos = ngx_cpymem(h2c->hpack.storage,
header->name.data + avail,
header->name.len - avail);
avail = NGX_HTTP_V2_TABLE_SIZE;
}
avail -= header->name.len;
entry->value.len = header->value.len;
entry->value.data = h2c->hpack.pos;
if (avail >= header->value.len) {
h2c->hpack.pos = ngx_cpymem(h2c->hpack.pos, header->value.data,
header->value.len);
} else {
ngx_memcpy(h2c->hpack.pos, header->value.data, avail);
h2c->hpack.pos = ngx_cpymem(h2c->hpack.storage,
header->value.data + avail,
header->value.len - avail);
}
if (h2c->hpack.allocated == h2c->hpack.added - h2c->hpack.deleted) {
entries = ngx_palloc(h2c->connection->pool,
sizeof(ngx_http_v2_header_t *)
* (h2c->hpack.allocated + 64));
if (entries == NULL) {
return NGX_ERROR;
}
index = h2c->hpack.deleted % h2c->hpack.allocated;
ngx_memcpy(entries, &h2c->hpack.entries[index],
(h2c->hpack.allocated - index)
* sizeof(ngx_http_v2_header_t *));
ngx_memcpy(&entries[h2c->hpack.allocated - index], h2c->hpack.entries,
index * sizeof(ngx_http_v2_header_t *));
(void) ngx_pfree(h2c->connection->pool, h2c->hpack.entries);
h2c->hpack.entries = entries;
h2c->hpack.added = h2c->hpack.allocated;
h2c->hpack.deleted = 0;
h2c->hpack.reused = 0;
h2c->hpack.allocated += 64;
}
h2c->hpack.entries[h2c->hpack.added++ % h2c->hpack.allocated] = entry;
return NGX_OK;
}
static ngx_int_t
ngx_http_v2_table_account(ngx_http_v2_connection_t *h2c, size_t size)
{
ngx_http_v2_header_t *entry;
size += 32;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
"http2 hpack table account: %uz free:%uz",
size, h2c->hpack.free);
if (size <= h2c->hpack.free) {
h2c->hpack.free -= size;
return NGX_OK;
}
if (size > h2c->hpack.size) {
h2c->hpack.deleted = h2c->hpack.added;
h2c->hpack.free = h2c->hpack.size;
return NGX_DECLINED;
}
do {
entry = h2c->hpack.entries[h2c->hpack.deleted++ % h2c->hpack.allocated];
h2c->hpack.free += 32 + entry->name.len + entry->value.len;
} while (size > h2c->hpack.free);
h2c->hpack.free -= size;
return NGX_OK;
}
ngx_int_t
ngx_http_v2_table_size(ngx_http_v2_connection_t *h2c, size_t size)
{
ssize_t needed;
ngx_http_v2_header_t *entry;
if (size > NGX_HTTP_V2_TABLE_SIZE) {
ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
"client sent invalid table size update: %uz", size);
return NGX_ERROR;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
"http2 new hpack table size: %uz was:%uz",
size, h2c->hpack.size);
needed = h2c->hpack.size - size;
while (needed > (ssize_t) h2c->hpack.free) {
entry = h2c->hpack.entries[h2c->hpack.deleted++ % h2c->hpack.allocated];
h2c->hpack.free += 32 + entry->name.len + entry->value.len;
}
h2c->hpack.size = size;
h2c->hpack.free -= needed;
return NGX_OK;
}
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