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838b8537b6
nginx/src/http/v3/ngx_http_v3_parse.c
Sanjay Jangid 838b8537b6
Update ngx_http_v3_parse.c
2025-07-14 16:34:16 +05:30

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/*
* Copyright (C) Roman Arutyunyan
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#define ngx_http_v3_is_v2_frame(type) \
((type) == 0x02 || (type) == 0x06 || (type) == 0x08 || (type) == 0x09)
static void ngx_http_v3_parse_start_local(ngx_buf_t *b, ngx_buf_t *loc,
ngx_uint_t n);
static void ngx_http_v3_parse_end_local(ngx_buf_t *b, ngx_buf_t *loc,
ngx_uint_t *n);
static ngx_int_t ngx_http_v3_parse_skip(ngx_buf_t *b, ngx_uint_t *length);
static ngx_int_t ngx_http_v3_parse_varlen_int(ngx_connection_t *c,
ngx_http_v3_parse_varlen_int_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_prefix_int(ngx_connection_t *c,
ngx_http_v3_parse_prefix_int_t *st, ngx_uint_t prefix, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_field_section_prefix(ngx_connection_t *c,
ngx_http_v3_parse_field_section_prefix_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_field_rep(ngx_connection_t *c,
ngx_http_v3_parse_field_rep_t *st, ngx_uint_t base, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_literal(ngx_connection_t *c,
ngx_http_v3_parse_literal_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_field_ri(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_field_lri(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_field_l(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_field_pbi(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_field_lpbi(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_control(ngx_connection_t *c,
ngx_http_v3_parse_control_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_settings(ngx_connection_t *c,
ngx_http_v3_parse_settings_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_encoder(ngx_connection_t *c,
ngx_http_v3_parse_encoder_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_field_inr(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_field_iln(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_decoder(ngx_connection_t *c,
ngx_http_v3_parse_decoder_t *st, ngx_buf_t *b);
static ngx_int_t ngx_http_v3_parse_lookup(ngx_connection_t *c,
ngx_uint_t dynamic, ngx_uint_t index, ngx_str_t *name, ngx_str_t *value);
static void
ngx_http_v3_parse_start_local(ngx_buf_t *b, ngx_buf_t *loc, ngx_uint_t n)
{
*loc = *b;
if ((size_t) (loc->last - loc->pos) > n) {
loc->last = loc->pos + n;
}
}
static void
ngx_http_v3_parse_end_local(ngx_buf_t *b, ngx_buf_t *loc, ngx_uint_t *pn)
{
*pn -= loc->pos - b->pos;
b->pos = loc->pos;
}
static ngx_int_t
ngx_http_v3_parse_skip(ngx_buf_t *b, ngx_uint_t *length)
{
if ((size_t) (b->last - b->pos) < *length) {
*length -= b->last - b->pos;
b->pos = b->last;
return NGX_AGAIN;
}
b->pos += *length;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_varlen_int(ngx_connection_t *c,
ngx_http_v3_parse_varlen_int_t *st, ngx_buf_t *b)
{
u_char ch;
enum {
sw_start = 0,
sw_length_2,
sw_length_3,
sw_length_4,
sw_length_5,
sw_length_6,
sw_length_7,
sw_length_8
};
for ( ;; ) {
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos++;
switch (st->state) {
case sw_start:
st->value = ch;
if (st->value & 0xc0) {
st->state = sw_length_2;
break;
}
goto done;
case sw_length_2:
st->value = (st->value << 8) + ch;
if ((st->value & 0xc000) == 0x4000) {
st->value &= 0x3fff;
goto done;
}
st->state = sw_length_3;
break;
case sw_length_4:
st->value = (st->value << 8) + ch;
if ((st->value & 0xc0000000) == 0x80000000) {
st->value &= 0x3fffffff;
goto done;
}
st->state = sw_length_5;
break;
case sw_length_3:
case sw_length_5:
case sw_length_6:
case sw_length_7:
st->value = (st->value << 8) + ch;
st->state++;
break;
case sw_length_8:
st->value = (st->value << 8) + ch;
st->value &= 0x3fffffffffffffff;
goto done;
}
}
done:
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse varlen int %uL", st->value);
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_prefix_int(ngx_connection_t *c,
ngx_http_v3_parse_prefix_int_t *st, ngx_uint_t prefix, ngx_buf_t *b)
{
u_char ch;
ngx_uint_t mask;
enum {
sw_start = 0,
sw_value
};
for ( ;; ) {
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos++;
switch (st->state) {
case sw_start:
mask = (1 << prefix) - 1;
st->value = ch & mask;
if (st->value != mask) {
goto done;
}
st->shift = 0;
st->state = sw_value;
break;
case sw_value:
st->value += (uint64_t) (ch & 0x7f) << st->shift;
if (st->shift == 56
&& ((ch & 0x80) || (st->value & 0xc000000000000000)))
{
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client exceeded integer size limit");
return NGX_HTTP_V3_ERR_EXCESSIVE_LOAD;
}
if (ch & 0x80) {
st->shift += 7;
break;
}
goto done;
}
}
done:
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse prefix int %uL", st->value);
st->state = sw_start;
return NGX_DONE;
}
ngx_int_t
ngx_http_v3_parse_headers(ngx_connection_t *c, ngx_http_v3_parse_headers_t *st,
ngx_buf_t *b)
{
ngx_buf_t loc;
ngx_int_t rc;
enum {
sw_start = 0,
sw_type,
sw_length,
sw_skip,
sw_prefix,
sw_verify,
sw_field_rep,
sw_done
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse headers");
st->state = sw_type;
/* fall through */
case sw_type:
rc = ngx_http_v3_parse_varlen_int(c, &st->vlint, b);
if (rc != NGX_DONE) {
return rc;
}
st->type = st->vlint.value;
if (ngx_http_v3_is_v2_frame(st->type)
|| st->type == NGX_HTTP_V3_FRAME_DATA
|| st->type == NGX_HTTP_V3_FRAME_GOAWAY
|| st->type == NGX_HTTP_V3_FRAME_SETTINGS
|| st->type == NGX_HTTP_V3_FRAME_MAX_PUSH_ID
|| st->type == NGX_HTTP_V3_FRAME_CANCEL_PUSH
|| st->type == NGX_HTTP_V3_FRAME_PUSH_PROMISE)
{
return NGX_HTTP_V3_ERR_FRAME_UNEXPECTED;
}
st->state = sw_length;
break;
case sw_length:
rc = ngx_http_v3_parse_varlen_int(c, &st->vlint, b);
if (rc != NGX_DONE) {
return rc;
}
st->length = st->vlint.value;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse headers type:%ui, len:%ui",
st->type, st->length);
if (st->type != NGX_HTTP_V3_FRAME_HEADERS) {
st->state = st->length > 0 ? sw_skip : sw_type;
break;
}
if (st->length == 0) {
return NGX_HTTP_V3_ERR_FRAME_ERROR;
}
st->state = sw_prefix;
break;
case sw_skip:
rc = ngx_http_v3_parse_skip(b, &st->length);
if (rc != NGX_DONE) {
return rc;
}
st->state = sw_type;
break;
case sw_prefix:
ngx_http_v3_parse_start_local(b, &loc, st->length);
rc = ngx_http_v3_parse_field_section_prefix(c, &st->prefix, &loc);
ngx_http_v3_parse_end_local(b, &loc, &st->length);
if (st->length == 0 && rc == NGX_AGAIN) {
return NGX_HTTP_V3_ERR_FRAME_ERROR;
}
if (rc != NGX_DONE) {
return rc;
}
st->state = sw_verify;
break;
case sw_verify:
rc = ngx_http_v3_check_insert_count(c, st->prefix.insert_count);
if (rc != NGX_OK) {
return rc;
}
st->state = sw_field_rep;
/* fall through */
case sw_field_rep:
ngx_http_v3_parse_start_local(b, &loc, st->length);
rc = ngx_http_v3_parse_field_rep(c, &st->field_rep, st->prefix.base,
&loc);
ngx_http_v3_parse_end_local(b, &loc, &st->length);
if (st->length == 0 && rc == NGX_AGAIN) {
return NGX_HTTP_V3_ERR_FRAME_ERROR;
}
if (rc != NGX_DONE) {
return rc;
}
if (st->length == 0) {
goto done;
}
return NGX_OK;
}
}
done:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 parse headers done");
if (st->prefix.insert_count > 0) {
if (ngx_http_v3_send_ack_section(c, c->quic->id) != NGX_OK) {
return NGX_ERROR;
}
ngx_http_v3_ack_insert_count(c, st->prefix.insert_count);
}
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_field_section_prefix(ngx_connection_t *c,
ngx_http_v3_parse_field_section_prefix_t *st, ngx_buf_t *b)
{
u_char ch;
ngx_int_t rc;
enum {
sw_start = 0,
sw_req_insert_count,
sw_delta_base,
sw_read_delta_base
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field section prefix");
st->state = sw_req_insert_count;
/* fall through */
case sw_req_insert_count:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 8, b);
if (rc != NGX_DONE) {
return rc;
}
st->insert_count = st->pint.value;
st->state = sw_delta_base;
break;
case sw_delta_base:
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
st->sign = (ch & 0x80) ? 1 : 0;
st->state = sw_read_delta_base;
/* fall through */
case sw_read_delta_base:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 7, b);
if (rc != NGX_DONE) {
return rc;
}
st->delta_base = st->pint.value;
goto done;
}
}
done:
rc = ngx_http_v3_decode_insert_count(c, &st->insert_count);
if (rc != NGX_OK) {
return rc;
}
if (st->sign) {
if (st->insert_count <= st->delta_base) {
ngx_log_error(NGX_LOG_INFO, c->log, 0, "client sent negative base");
return NGX_HTTP_V3_ERR_DECOMPRESSION_FAILED;
}
st->base = st->insert_count - st->delta_base - 1;
} else {
st->base = st->insert_count + st->delta_base;
}
ngx_log_debug4(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field section prefix done "
"insert_count:%ui, sign:%ui, delta_base:%ui, base:%ui",
st->insert_count, st->sign, st->delta_base, st->base);
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_field_rep(ngx_connection_t *c,
ngx_http_v3_parse_field_rep_t *st, ngx_uint_t base, ngx_buf_t *b)
{
u_char ch;
ngx_int_t rc;
enum {
sw_start = 0,
sw_field_ri,
sw_field_lri,
sw_field_l,
sw_field_pbi,
sw_field_lpbi
};
if (st->state == sw_start) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field representation");
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
ngx_memzero(&st->field, sizeof(ngx_http_v3_parse_field_t));
st->field.base = base;
if (ch & 0x80) {
/* Indexed Field Line */
st->state = sw_field_ri;
} else if (ch & 0x40) {
/* Literal Field Line With Name Reference */
st->state = sw_field_lri;
} else if (ch & 0x20) {
/* Literal Field Line With Literal Name */
st->state = sw_field_l;
} else if (ch & 0x10) {
/* Indexed Field Line With Post-Base Index */
st->state = sw_field_pbi;
} else {
/* Literal Field Line With Post-Base Name Reference */
st->state = sw_field_lpbi;
}
}
switch (st->state) {
case sw_field_ri:
rc = ngx_http_v3_parse_field_ri(c, &st->field, b);
break;
case sw_field_lri:
rc = ngx_http_v3_parse_field_lri(c, &st->field, b);
break;
case sw_field_l:
rc = ngx_http_v3_parse_field_l(c, &st->field, b);
break;
case sw_field_pbi:
rc = ngx_http_v3_parse_field_pbi(c, &st->field, b);
break;
case sw_field_lpbi:
rc = ngx_http_v3_parse_field_lpbi(c, &st->field, b);
break;
default:
rc = NGX_OK;
}
if (rc != NGX_DONE) {
return rc;
}
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field representation done");
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_literal(ngx_connection_t *c, ngx_http_v3_parse_literal_t *st,
ngx_buf_t *b)
{
u_char ch;
ngx_uint_t n;
ngx_http_core_srv_conf_t *cscf;
enum {
sw_start = 0,
sw_value
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse literal huff:%ui, len:%ui",
st->huffman, st->length);
n = st->length;
cscf = ngx_http_v3_get_module_srv_conf(c, ngx_http_core_module);
if (n > cscf->large_client_header_buffers.size) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent too large field line");
return NGX_HTTP_V3_ERR_EXCESSIVE_LOAD;
}
if (st->huffman) {
n = n * 8 / 5;
st->huffstate = 0;
}
st->last = ngx_pnalloc(c->pool, n + 1);
if (st->last == NULL) {
return NGX_ERROR;
}
st->value.data = st->last;
st->state = sw_value;
/* fall through */
case sw_value:
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos++;
if (st->huffman) {
if (ngx_http_huff_decode(&st->huffstate, &ch, 1, &st->last,
st->length == 1, c->log)
!= NGX_OK)
{
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid encoded field line");
return NGX_ERROR;
}
} else {
*st->last++ = ch;
}
if (--st->length) {
break;
}
st->value.len = st->last - st->value.data;
*st->last = '\0';
goto done;
}
}
done:
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse literal done \"%V\"", &st->value);
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_field_ri(ngx_connection_t *c, ngx_http_v3_parse_field_t *st,
ngx_buf_t *b)
{
u_char ch;
ngx_int_t rc;
enum {
sw_start = 0,
sw_index
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field ri");
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
st->dynamic = (ch & 0x40) ? 0 : 1;
st->state = sw_index;
/* fall through */
case sw_index:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 6, b);
if (rc != NGX_DONE) {
return rc;
}
st->index = st->pint.value;
goto done;
}
}
done:
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field ri done %s%ui]",
st->dynamic ? "dynamic[-" : "static[", st->index);
if (st->dynamic) {
st->index = st->base - st->index - 1;
}
rc = ngx_http_v3_parse_lookup(c, st->dynamic, st->index, &st->name,
&st->value);
if (rc != NGX_OK) {
return rc;
}
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_field_lri(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b)
{
u_char ch;
ngx_int_t rc;
enum {
sw_start = 0,
sw_index,
sw_value_len,
sw_read_value_len,
sw_value
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field lri");
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
st->dynamic = (ch & 0x10) ? 0 : 1;
st->state = sw_index;
/* fall through */
case sw_index:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 4, b);
if (rc != NGX_DONE) {
return rc;
}
st->index = st->pint.value;
st->state = sw_value_len;
break;
case sw_value_len:
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
st->literal.huffman = (ch & 0x80) ? 1 : 0;
st->state = sw_read_value_len;
/* fall through */
case sw_read_value_len:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 7, b);
if (rc != NGX_DONE) {
return rc;
}
st->literal.length = st->pint.value;
if (st->literal.length == 0) {
st->value.data = (u_char *) "";
goto done;
}
st->state = sw_value;
break;
case sw_value:
rc = ngx_http_v3_parse_literal(c, &st->literal, b);
if (rc != NGX_DONE) {
return rc;
}
st->value = st->literal.value;
goto done;
}
}
done:
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field lri done %s%ui] \"%V\"",
st->dynamic ? "dynamic[-" : "static[",
st->index, &st->value);
if (st->dynamic) {
st->index = st->base - st->index - 1;
}
rc = ngx_http_v3_parse_lookup(c, st->dynamic, st->index, &st->name, NULL);
if (rc != NGX_OK) {
return rc;
}
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_field_l(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b)
{
u_char ch;
ngx_int_t rc;
enum {
sw_start = 0,
sw_name_len,
sw_name,
sw_value_len,
sw_read_value_len,
sw_value
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field l");
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
st->literal.huffman = (ch & 0x08) ? 1 : 0;
st->state = sw_name_len;
/* fall through */
case sw_name_len:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 3, b);
if (rc != NGX_DONE) {
return rc;
}
st->literal.length = st->pint.value;
if (st->literal.length == 0) {
return NGX_ERROR;
}
st->state = sw_name;
break;
case sw_name:
rc = ngx_http_v3_parse_literal(c, &st->literal, b);
if (rc != NGX_DONE) {
return rc;
}
st->name = st->literal.value;
st->state = sw_value_len;
break;
case sw_value_len:
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
st->literal.huffman = (ch & 0x80) ? 1 : 0;
st->state = sw_read_value_len;
/* fall through */
case sw_read_value_len:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 7, b);
if (rc != NGX_DONE) {
return rc;
}
st->literal.length = st->pint.value;
if (st->literal.length == 0) {
st->value.data = (u_char *) "";
goto done;
}
st->state = sw_value;
break;
case sw_value:
rc = ngx_http_v3_parse_literal(c, &st->literal, b);
if (rc != NGX_DONE) {
return rc;
}
st->value = st->literal.value;
goto done;
}
}
done:
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field l done \"%V\" \"%V\"",
&st->name, &st->value);
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_field_pbi(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b)
{
ngx_int_t rc;
enum {
sw_start = 0,
sw_index
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field pbi");
st->state = sw_index;
/* fall through */
case sw_index:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 4, b);
if (rc != NGX_DONE) {
return rc;
}
st->index = st->pint.value;
goto done;
}
}
done:
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field pbi done dynamic[+%ui]", st->index);
rc = ngx_http_v3_parse_lookup(c, 1, st->base + st->index, &st->name,
&st->value);
if (rc != NGX_OK) {
return rc;
}
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_field_lpbi(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b)
{
u_char ch;
ngx_int_t rc;
enum {
sw_start = 0,
sw_index,
sw_value_len,
sw_read_value_len,
sw_value
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field lpbi");
st->state = sw_index;
/* fall through */
case sw_index:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 3, b);
if (rc != NGX_DONE) {
return rc;
}
st->index = st->pint.value;
st->state = sw_value_len;
break;
case sw_value_len:
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
st->literal.huffman = (ch & 0x80) ? 1 : 0;
st->state = sw_read_value_len;
/* fall through */
case sw_read_value_len:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 7, b);
if (rc != NGX_DONE) {
return rc;
}
st->literal.length = st->pint.value;
if (st->literal.length == 0) {
st->value.data = (u_char *) "";
goto done;
}
st->state = sw_value;
break;
case sw_value:
rc = ngx_http_v3_parse_literal(c, &st->literal, b);
if (rc != NGX_DONE) {
return rc;
}
st->value = st->literal.value;
goto done;
}
}
done:
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field lpbi done dynamic[+%ui] \"%V\"",
st->index, &st->value);
rc = ngx_http_v3_parse_lookup(c, 1, st->base + st->index, &st->name, NULL);
if (rc != NGX_OK) {
return rc;
}
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_lookup(ngx_connection_t *c, ngx_uint_t dynamic,
ngx_uint_t index, ngx_str_t *name, ngx_str_t *value)
{
u_char *p;
if (!dynamic) {
if (ngx_http_v3_lookup_static(c, index, name, value) != NGX_OK) {
return NGX_HTTP_V3_ERR_DECOMPRESSION_FAILED;
}
return NGX_OK;
}
if (ngx_http_v3_lookup(c, index, name, value) != NGX_OK) {
return NGX_HTTP_V3_ERR_DECOMPRESSION_FAILED;
}
if (name) {
p = ngx_pnalloc(c->pool, name->len + 1);
if (p == NULL) {
return NGX_ERROR;
}
ngx_memcpy(p, name->data, name->len);
p[name->len] = '\0';
name->data = p;
}
if (value) {
p = ngx_pnalloc(c->pool, value->len + 1);
if (p == NULL) {
return NGX_ERROR;
}
ngx_memcpy(p, value->data, value->len);
p[value->len] = '\0';
value->data = p;
}
return NGX_OK;
}
static ngx_int_t
ngx_http_v3_parse_control(ngx_connection_t *c, ngx_http_v3_parse_control_t *st,
ngx_buf_t *b)
{
ngx_buf_t loc;
ngx_int_t rc;
enum {
sw_start = 0,
sw_first_type,
sw_type,
sw_length,
sw_settings,
sw_skip
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse control");
st->state = sw_first_type;
/* fall through */
case sw_first_type:
case sw_type:
rc = ngx_http_v3_parse_varlen_int(c, &st->vlint, b);
if (rc != NGX_DONE) {
return rc;
}
st->type = st->vlint.value;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse frame type:%ui", st->type);
if (st->state == sw_first_type
&& st->type != NGX_HTTP_V3_FRAME_SETTINGS)
{
return NGX_HTTP_V3_ERR_MISSING_SETTINGS;
}
if (st->state != sw_first_type
&& st->type == NGX_HTTP_V3_FRAME_SETTINGS)
{
return NGX_HTTP_V3_ERR_FRAME_UNEXPECTED;
}
if (ngx_http_v3_is_v2_frame(st->type)
|| st->type == NGX_HTTP_V3_FRAME_DATA
|| st->type == NGX_HTTP_V3_FRAME_HEADERS
|| st->type == NGX_HTTP_V3_FRAME_PUSH_PROMISE)
{
return NGX_HTTP_V3_ERR_FRAME_UNEXPECTED;
}
if (st->type == NGX_HTTP_V3_FRAME_CANCEL_PUSH) {
return NGX_HTTP_V3_ERR_ID_ERROR;
}
st->state = sw_length;
break;
case sw_length:
rc = ngx_http_v3_parse_varlen_int(c, &st->vlint, b);
if (rc != NGX_DONE) {
return rc;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse frame len:%uL", st->vlint.value);
st->length = st->vlint.value;
if (st->length == 0) {
st->state = sw_type;
break;
}
switch (st->type) {
case NGX_HTTP_V3_FRAME_SETTINGS:
st->state = sw_settings;
break;
default:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse skip unknown frame");
st->state = sw_skip;
}
break;
case sw_settings:
ngx_http_v3_parse_start_local(b, &loc, st->length);
rc = ngx_http_v3_parse_settings(c, &st->settings, &loc);
ngx_http_v3_parse_end_local(b, &loc, &st->length);
if (st->length == 0 && rc == NGX_AGAIN) {
return NGX_HTTP_V3_ERR_SETTINGS_ERROR;
}
if (rc != NGX_DONE) {
return rc;
}
if (st->length == 0) {
st->state = sw_type;
}
break;
case sw_skip:
rc = ngx_http_v3_parse_skip(b, &st->length);
if (rc != NGX_DONE) {
return rc;
}
st->state = sw_type;
break;
}
}
}
static ngx_int_t
ngx_http_v3_parse_settings(ngx_connection_t *c,
ngx_http_v3_parse_settings_t *st, ngx_buf_t *b)
{
ngx_int_t rc;
enum {
sw_start = 0,
sw_id,
sw_value
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse settings");
st->state = sw_id;
/* fall through */
case sw_id:
rc = ngx_http_v3_parse_varlen_int(c, &st->vlint, b);
if (rc != NGX_DONE) {
return rc;
}
st->id = st->vlint.value;
st->state = sw_value;
break;
case sw_value:
rc = ngx_http_v3_parse_varlen_int(c, &st->vlint, b);
if (rc != NGX_DONE) {
return rc;
}
if (ngx_http_v3_set_param(c, st->id, st->vlint.value) != NGX_OK) {
return NGX_HTTP_V3_ERR_SETTINGS_ERROR;
}
goto done;
}
}
done:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 parse settings done");
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_encoder(ngx_connection_t *c, ngx_http_v3_parse_encoder_t *st,
ngx_buf_t *b)
{
u_char ch;
ngx_int_t rc;
enum {
sw_start = 0,
sw_inr,
sw_iln,
sw_capacity,
sw_duplicate
};
for ( ;; ) {
if (st->state == sw_start) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse encoder instruction");
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
if (ch & 0x80) {
/* Insert With Name Reference */
st->state = sw_inr;
} else if (ch & 0x40) {
/* Insert With Literal Name */
st->state = sw_iln;
} else if (ch & 0x20) {
/* Set Dynamic Table Capacity */
st->state = sw_capacity;
} else {
/* Duplicate */
st->state = sw_duplicate;
}
}
switch (st->state) {
case sw_inr:
rc = ngx_http_v3_parse_field_inr(c, &st->field, b);
if (rc != NGX_DONE) {
return rc;
}
st->state = sw_start;
break;
case sw_iln:
rc = ngx_http_v3_parse_field_iln(c, &st->field, b);
if (rc != NGX_DONE) {
return rc;
}
st->state = sw_start;
break;
case sw_capacity:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 5, b);
if (rc != NGX_DONE) {
return rc;
}
rc = ngx_http_v3_set_capacity(c, st->pint.value);
if (rc != NGX_OK) {
return rc;
}
st->state = sw_start;
break;
default: /* sw_duplicate */
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 5, b);
if (rc != NGX_DONE) {
return rc;
}
rc = ngx_http_v3_duplicate(c, st->pint.value);
if (rc != NGX_OK) {
return rc;
}
st->state = sw_start;
break;
}
}
}
static ngx_int_t
ngx_http_v3_parse_field_inr(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b)
{
u_char ch;
ngx_int_t rc;
enum {
sw_start = 0,
sw_name_index,
sw_value_len,
sw_read_value_len,
sw_value
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field inr");
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
st->dynamic = (ch & 0x40) ? 0 : 1;
st->state = sw_name_index;
/* fall through */
case sw_name_index:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 6, b);
if (rc != NGX_DONE) {
return rc;
}
st->index = st->pint.value;
st->state = sw_value_len;
break;
case sw_value_len:
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
st->literal.huffman = (ch & 0x80) ? 1 : 0;
st->state = sw_read_value_len;
/* fall through */
case sw_read_value_len:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 7, b);
if (rc != NGX_DONE) {
return rc;
}
st->literal.length = st->pint.value;
if (st->literal.length == 0) {
st->value.len = 0;
goto done;
}
st->state = sw_value;
break;
case sw_value:
rc = ngx_http_v3_parse_literal(c, &st->literal, b);
if (rc != NGX_DONE) {
return rc;
}
st->value = st->literal.value;
goto done;
}
}
done:
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field inr done %s[%ui] \"%V\"",
st->dynamic ? "dynamic" : "static",
st->index, &st->value);
rc = ngx_http_v3_ref_insert(c, st->dynamic, st->index, &st->value);
if (rc != NGX_OK) {
return rc;
}
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_field_iln(ngx_connection_t *c,
ngx_http_v3_parse_field_t *st, ngx_buf_t *b)
{
u_char ch;
ngx_int_t rc;
enum {
sw_start = 0,
sw_name_len,
sw_name,
sw_value_len,
sw_read_value_len,
sw_value
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field iln");
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
st->literal.huffman = (ch & 0x20) ? 1 : 0;
st->state = sw_name_len;
/* fall through */
case sw_name_len:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 5, b);
if (rc != NGX_DONE) {
return rc;
}
st->literal.length = st->pint.value;
if (st->literal.length == 0) {
return NGX_ERROR;
}
st->state = sw_name;
break;
case sw_name:
rc = ngx_http_v3_parse_literal(c, &st->literal, b);
if (rc != NGX_DONE) {
return rc;
}
st->name = st->literal.value;
st->state = sw_value_len;
break;
case sw_value_len:
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
st->literal.huffman = (ch & 0x80) ? 1 : 0;
st->state = sw_read_value_len;
/* fall through */
case sw_read_value_len:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 7, b);
if (rc != NGX_DONE) {
return rc;
}
st->literal.length = st->pint.value;
if (st->literal.length == 0) {
st->value.len = 0;
goto done;
}
st->state = sw_value;
break;
case sw_value:
rc = ngx_http_v3_parse_literal(c, &st->literal, b);
if (rc != NGX_DONE) {
return rc;
}
st->value = st->literal.value;
goto done;
}
}
done:
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse field iln done \"%V\":\"%V\"",
&st->name, &st->value);
rc = ngx_http_v3_insert(c, &st->name, &st->value);
if (rc != NGX_OK) {
return rc;
}
st->state = sw_start;
return NGX_DONE;
}
static ngx_int_t
ngx_http_v3_parse_decoder(ngx_connection_t *c, ngx_http_v3_parse_decoder_t *st,
ngx_buf_t *b)
{
u_char ch;
ngx_int_t rc;
enum {
sw_start = 0,
sw_ack_section,
sw_cancel_stream,
sw_inc_insert_count
};
for ( ;; ) {
if (st->state == sw_start) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse decoder instruction");
if (b->pos == b->last) {
return NGX_AGAIN;
}
ch = *b->pos;
if (ch & 0x80) {
/* Section Acknowledgment */
st->state = sw_ack_section;
} else if (ch & 0x40) {
/* Stream Cancellation */
st->state = sw_cancel_stream;
} else {
/* Insert Count Increment */
st->state = sw_inc_insert_count;
}
}
switch (st->state) {
case sw_ack_section:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 7, b);
if (rc != NGX_DONE) {
return rc;
}
rc = ngx_http_v3_ack_section(c, st->pint.value);
if (rc != NGX_OK) {
return rc;
}
st->state = sw_start;
break;
case sw_cancel_stream:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 6, b);
if (rc != NGX_DONE) {
return rc;
}
rc = ngx_http_v3_cancel_stream(c, st->pint.value);
if (rc != NGX_OK) {
return rc;
}
st->state = sw_start;
break;
case sw_inc_insert_count:
rc = ngx_http_v3_parse_prefix_int(c, &st->pint, 6, b);
if (rc != NGX_DONE) {
return rc;
}
rc = ngx_http_v3_inc_insert_count(c, st->pint.value);
if (rc != NGX_OK) {
return rc;
}
st->state = sw_start;
break;
}
}
}
ngx_int_t
ngx_http_v3_parse_data(ngx_connection_t *c, ngx_http_v3_parse_data_t *st,
ngx_buf_t *b)
{
ngx_int_t rc;
enum {
sw_start = 0,
sw_type,
sw_length,
sw_skip
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 parse data");
st->state = sw_type;
/* fall through */
case sw_type:
rc = ngx_http_v3_parse_varlen_int(c, &st->vlint, b);
if (rc != NGX_DONE) {
return rc;
}
st->type = st->vlint.value;
if (st->type == NGX_HTTP_V3_FRAME_HEADERS) {
/* trailers */
goto done;
}
if (ngx_http_v3_is_v2_frame(st->type)
|| st->type == NGX_HTTP_V3_FRAME_GOAWAY
|| st->type == NGX_HTTP_V3_FRAME_SETTINGS
|| st->type == NGX_HTTP_V3_FRAME_MAX_PUSH_ID
|| st->type == NGX_HTTP_V3_FRAME_CANCEL_PUSH
|| st->type == NGX_HTTP_V3_FRAME_PUSH_PROMISE)
{
return NGX_HTTP_V3_ERR_FRAME_UNEXPECTED;
}
st->state = sw_length;
break;
case sw_length:
rc = ngx_http_v3_parse_varlen_int(c, &st->vlint, b);
if (rc != NGX_DONE) {
return rc;
}
st->length = st->vlint.value;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http3 parse data type:%ui, len:%ui",
st->type, st->length);
if (st->type != NGX_HTTP_V3_FRAME_DATA && st->length > 0) {
st->state = sw_skip;
break;
}
st->state = sw_type;
return NGX_OK;
case sw_skip:
rc = ngx_http_v3_parse_skip(b, &st->length);
if (rc != NGX_DONE) {
return rc;
}
st->state = sw_type;
break;
}
}
done:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 parse data done");
st->state = sw_start;
return NGX_DONE;
}
ngx_int_t
ngx_http_v3_parse_uni(ngx_connection_t *c, ngx_http_v3_parse_uni_t *st,
ngx_buf_t *b)
{
ngx_int_t rc;
enum {
sw_start = 0,
sw_type,
sw_control,
sw_encoder,
sw_decoder,
sw_unknown
};
for ( ;; ) {
switch (st->state) {
case sw_start:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 parse uni");
st->state = sw_type;
/* fall through */
case sw_type:
rc = ngx_http_v3_parse_varlen_int(c, &st->vlint, b);
if (rc != NGX_DONE) {
return rc;
}
rc = ngx_http_v3_register_uni_stream(c, st->vlint.value);
if (rc != NGX_OK) {
return rc;
}
switch (st->vlint.value) {
case NGX_HTTP_V3_STREAM_CONTROL:
st->state = sw_control;
break;
case NGX_HTTP_V3_STREAM_ENCODER:
st->state = sw_encoder;
break;
case NGX_HTTP_V3_STREAM_DECODER:
st->state = sw_decoder;
break;
default:
st->state = sw_unknown;
}
break;
case sw_control:
return ngx_http_v3_parse_control(c, &st->u.control, b);
case sw_encoder:
return ngx_http_v3_parse_encoder(c, &st->u.encoder, b);
case sw_decoder:
return ngx_http_v3_parse_decoder(c, &st->u.decoder, b);
case sw_unknown:
b->pos = b->last;
return NGX_AGAIN;
}
}
}
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