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HTTP/2: "http2" directive.

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The directive enables HTTP/2 in the current server.  The previous way to
enable HTTP/2 via "listen ... http2" is now deprecated.  The new approach
allows to share HTTP/2 and HTTP/0.9-1.1 on the same port.

For SSL connections, HTTP/2 is now selected by ALPN callback based on whether
the protocol is enabled in the virtual server chosen by SNI.  This however only
works since OpenSSL 1.0.2h, where ALPN callback is invoked after SNI callback.
For older versions of OpenSSL, HTTP/2 is enabled based on the default virtual
server configuration.

For plain TCP connections, HTTP/2 is now auto-detected by HTTP/2 preface, if
HTTP/2 is enabled in the default virtual server.  If preface is not matched,
HTTP/0.9-1.1 is assumed.
This commit is contained in:
Roman Arutyunyan 2023-05-16 16:30:08 +04:00
parent cb70d5954c
commit aefd862ab1
7 changed files with 127 additions and 62 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/http/modules/ngx_http_ssl_module.c
View File

@ -435,6 +435,9 @@ ngx_http_ssl_alpn_select(ngx_ssl_conn_t *ssl_conn, const unsigned char **out,
#if (NGX_HTTP_V2 || NGX_HTTP_V3)
ngx_http_connection_t *hc;
#endif
#if (NGX_HTTP_V2)
ngx_http_v2_srv_conf_t *h2scf;
#endif
#if (NGX_HTTP_V3)
ngx_http_v3_srv_conf_t *h3scf;
#endif
@ -456,12 +459,6 @@ ngx_http_ssl_alpn_select(ngx_ssl_conn_t *ssl_conn, const unsigned char **out,
hc = c->data;
#endif
#if (NGX_HTTP_V2)
if (hc->addr_conf->http2) {
srv = (unsigned char *) NGX_HTTP_V2_ALPN_PROTO NGX_HTTP_ALPN_PROTOS;
srvlen = sizeof(NGX_HTTP_V2_ALPN_PROTO NGX_HTTP_ALPN_PROTOS) - 1;
} else
#endif
#if (NGX_HTTP_V3)
if (hc->addr_conf->quic) {
@ -485,12 +482,23 @@ ngx_http_ssl_alpn_select(ngx_ssl_conn_t *ssl_conn, const unsigned char **out,
return SSL_TLSEXT_ERR_ALERT_FATAL;
}
} else
#endif
{
#if (NGX_HTTP_V2)
h2scf = ngx_http_get_module_srv_conf(hc->conf_ctx, ngx_http_v2_module);
if (h2scf->enable || hc->addr_conf->http2) {
srv = (unsigned char *) NGX_HTTP_V2_ALPN_PROTO NGX_HTTP_ALPN_PROTOS;
srvlen = sizeof(NGX_HTTP_V2_ALPN_PROTO NGX_HTTP_ALPN_PROTOS) - 1;
} else
#endif
{
srv = (unsigned char *) NGX_HTTP_ALPN_PROTOS;
srvlen = sizeof(NGX_HTTP_ALPN_PROTOS) - 1;
}
}
if (SSL_select_next_proto((unsigned char **) out, outlen, srv, srvlen,
in, inlen)

5
src/http/ngx_http_core_module.c
View File

@ -4176,6 +4176,11 @@ ngx_http_core_listen(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
if (ngx_strcmp(value[n].data, "http2") == 0) {
#if (NGX_HTTP_V2)
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
"the \"listen ... http2\" directive "
"is deprecated, use "
"the \"http2\" directive instead");
lsopt.http2 = 1;
continue;
#else

45
src/http/ngx_http_request.c
View File

@ -318,12 +318,6 @@ ngx_http_init_connection(ngx_connection_t *c)
rev->handler = ngx_http_wait_request_handler;
c->write->handler = ngx_http_empty_handler;
#if (NGX_HTTP_V2)
if (hc->addr_conf->http2) {
rev->handler = ngx_http_v2_init;
}
#endif
#if (NGX_HTTP_V3)
if (hc->addr_conf->quic) {
ngx_http_v3_init_stream(c);
@ -383,6 +377,9 @@ ngx_http_wait_request_handler(ngx_event_t *rev)
ngx_buf_t *b;
ngx_connection_t *c;
ngx_http_connection_t *hc;
#if (NGX_HTTP_V2)
ngx_http_v2_srv_conf_t *h2scf;
#endif
ngx_http_core_srv_conf_t *cscf;
c = rev->data;
@ -429,6 +426,8 @@ ngx_http_wait_request_handler(ngx_event_t *rev)
b->end = b->last + size;
}
size = b->end - b->last;
n = c->recv(c, b->last, size);
if (n == NGX_AGAIN) {
@ -443,13 +442,17 @@ ngx_http_wait_request_handler(ngx_event_t *rev)
return;
}
if (b->pos == b->last) {
/*
* We are trying to not hold c->buffer's memory for an idle connection.
* We are trying to not hold c->buffer's memory for an
* idle connection.
*/
if (ngx_pfree(c->pool, b->start) == NGX_OK) {
b->start = NULL;
}
}
return;
}
@ -489,6 +492,29 @@ ngx_http_wait_request_handler(ngx_event_t *rev)
}
}
#if (NGX_HTTP_V2)
h2scf = ngx_http_get_module_srv_conf(hc->conf_ctx, ngx_http_v2_module);
if (!hc->ssl && (h2scf->enable || hc->addr_conf->http2)) {
size = ngx_min(sizeof(NGX_HTTP_V2_PREFACE) - 1,
(size_t) (b->last - b->pos));
if (ngx_memcmp(b->pos, NGX_HTTP_V2_PREFACE, size) == 0) {
if (size == sizeof(NGX_HTTP_V2_PREFACE) - 1) {
ngx_http_v2_init(rev);
return;
}
ngx_post_event(rev, &ngx_posted_events);
return;
}
}
#endif
c->log->action = "reading client request line";
ngx_reusable_connection(c, 0);
@ -811,10 +837,13 @@ ngx_http_ssl_handshake_handler(ngx_connection_t *c)
unsigned int len;
const unsigned char *data;
ngx_http_connection_t *hc;
ngx_http_v2_srv_conf_t *h2scf;
hc = c->data;
if (hc->addr_conf->http2) {
h2scf = ngx_http_get_module_srv_conf(hc->conf_ctx, ngx_http_v2_module);
if (h2scf->enable || hc->addr_conf->http2) {
SSL_get0_alpn_selected(c->ssl->connection, &data, &len);

60
src/http/v2/ngx_http_v2.c
View File

@ -63,8 +63,6 @@ static void ngx_http_v2_handle_connection(ngx_http_v2_connection_t *h2c);
static void ngx_http_v2_lingering_close(ngx_connection_t *c);
static void ngx_http_v2_lingering_close_handler(ngx_event_t *rev);
static u_char *ngx_http_v2_state_proxy_protocol(ngx_http_v2_connection_t *h2c,
u_char *pos, u_char *end);
static u_char *ngx_http_v2_state_preface(ngx_http_v2_connection_t *h2c,
u_char *pos, u_char *end);
static u_char *ngx_http_v2_state_preface_end(ngx_http_v2_connection_t *h2c,
@ -232,6 +230,7 @@ static ngx_http_v2_parse_header_t ngx_http_v2_parse_headers[] = {
void
ngx_http_v2_init(ngx_event_t *rev)
{
u_char *p, *end;
ngx_connection_t *c;
ngx_pool_cleanup_t *cln;
ngx_http_connection_t *hc;
@ -314,8 +313,7 @@ ngx_http_v2_init(ngx_event_t *rev)
return;
}
h2c->state.handler = hc->proxy_protocol ? ngx_http_v2_state_proxy_protocol
: ngx_http_v2_state_preface;
h2c->state.handler = ngx_http_v2_state_preface;
ngx_queue_init(&h2c->waiting);
ngx_queue_init(&h2c->dependencies);
@ -335,6 +333,23 @@ ngx_http_v2_init(ngx_event_t *rev)
c->idle = 1;
ngx_reusable_connection(c, 0);
if (c->buffer) {
p = c->buffer->pos;
end = c->buffer->last;
do {
p = h2c->state.handler(h2c, p, end);
if (p == NULL) {
return;
}
} while (p != end);
h2c->total_bytes += p - c->buffer->pos;
c->buffer->pos = p;
}
ngx_http_v2_read_handler(rev);
}
@ -846,32 +861,11 @@ ngx_http_v2_lingering_close_handler(ngx_event_t *rev)
}
static u_char *
ngx_http_v2_state_proxy_protocol(ngx_http_v2_connection_t *h2c, u_char *pos,
u_char *end)
{
ngx_log_t *log;
log = h2c->connection->log;
log->action = "reading PROXY protocol";
pos = ngx_proxy_protocol_read(h2c->connection, pos, end);
log->action = "processing HTTP/2 connection";
if (pos == NULL) {
return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_PROTOCOL_ERROR);
}
return ngx_http_v2_state_preface(h2c, pos, end);
}
static u_char *
ngx_http_v2_state_preface(ngx_http_v2_connection_t *h2c, u_char *pos,
u_char *end)
{
static const u_char preface[] = "PRI * HTTP/2.0\r\n";
static const u_char preface[] = NGX_HTTP_V2_PREFACE_START;
if ((size_t) (end - pos) < sizeof(preface) - 1) {
return ngx_http_v2_state_save(h2c, pos, end, ngx_http_v2_state_preface);
@ -892,7 +886,7 @@ static u_char *
ngx_http_v2_state_preface_end(ngx_http_v2_connection_t *h2c, u_char *pos,
u_char *end)
{
static const u_char preface[] = "\r\nSM\r\n\r\n";
static const u_char preface[] = NGX_HTTP_V2_PREFACE_END;
if ((size_t) (end - pos) < sizeof(preface) - 1) {
return ngx_http_v2_state_save(h2c, pos, end,
@ -3943,10 +3937,22 @@ static void
ngx_http_v2_run_request(ngx_http_request_t *r)
{
ngx_connection_t *fc;
ngx_http_v2_srv_conf_t *h2scf;
ngx_http_v2_connection_t *h2c;
fc = r->connection;
h2scf = ngx_http_get_module_srv_conf(r, ngx_http_v2_module);
if (!h2scf->enable && !r->http_connection->addr_conf->http2) {
ngx_log_error(NGX_LOG_INFO, fc->log, 0,
"client attempted to request the server name "
"for which the negotiated protocol is disabled");
ngx_http_finalize_request(r, NGX_HTTP_MISDIRECTED_REQUEST);
goto failed;
}
if (ngx_http_v2_construct_request_line(r) != NGX_OK) {
goto failed;
}

18
src/http/v2/ngx_http_v2.h
View File

@ -63,6 +63,16 @@ typedef u_char *(*ngx_http_v2_handler_pt) (ngx_http_v2_connection_t *h2c,
u_char *pos, u_char *end);
typedef struct {
ngx_flag_t enable;
size_t pool_size;
ngx_uint_t concurrent_streams;
ngx_uint_t concurrent_pushes;
size_t preread_size;
ngx_uint_t streams_index_mask;
} ngx_http_v2_srv_conf_t;
typedef struct {
ngx_str_t name;
ngx_str_t value;
@ -408,9 +418,17 @@ ngx_int_t ngx_http_v2_table_size(ngx_http_v2_connection_t *h2c, size_t size);
#define NGX_HTTP_V2_USER_AGENT_INDEX 58
#define NGX_HTTP_V2_VARY_INDEX 59
#define NGX_HTTP_V2_PREFACE_START "PRI * HTTP/2.0\r\n"
#define NGX_HTTP_V2_PREFACE_END "\r\nSM\r\n\r\n"
#define NGX_HTTP_V2_PREFACE NGX_HTTP_V2_PREFACE_START \
NGX_HTTP_V2_PREFACE_END
u_char *ngx_http_v2_string_encode(u_char *dst, u_char *src, size_t len,
u_char *tmp, ngx_uint_t lower);
extern ngx_module_t ngx_http_v2_module;
#endif /* _NGX_HTTP_V2_H_INCLUDED_ */

11
src/http/v2/ngx_http_v2_module.c
View File

@ -75,6 +75,13 @@ static ngx_conf_post_t ngx_http_v2_chunk_size_post =
static ngx_command_t ngx_http_v2_commands[] = {
{ ngx_string("http2"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_SRV_CONF_OFFSET,
offsetof(ngx_http_v2_srv_conf_t, enable),
NULL },
{ ngx_string("http2_recv_buffer_size"),
NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
@ -314,6 +321,8 @@ ngx_http_v2_create_srv_conf(ngx_conf_t *cf)
return NULL;
}
h2scf->enable = NGX_CONF_UNSET;
h2scf->pool_size = NGX_CONF_UNSET_SIZE;
h2scf->concurrent_streams = NGX_CONF_UNSET_UINT;
@ -333,6 +342,8 @@ ngx_http_v2_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
ngx_http_v2_srv_conf_t *prev = parent;
ngx_http_v2_srv_conf_t *conf = child;
ngx_conf_merge_value(conf->enable, prev->enable, 0);
ngx_conf_merge_size_value(conf->pool_size, prev->pool_size, 4096);
ngx_conf_merge_uint_value(conf->concurrent_streams,

12
src/http/v2/ngx_http_v2_module.h
View File

@ -20,15 +20,6 @@ typedef struct {
} ngx_http_v2_main_conf_t;
typedef struct {
size_t pool_size;
ngx_uint_t concurrent_streams;
ngx_uint_t concurrent_pushes;
size_t preread_size;
ngx_uint_t streams_index_mask;
} ngx_http_v2_srv_conf_t;
typedef struct {
size_t chunk_size;
@ -39,7 +30,4 @@ typedef struct {
} ngx_http_v2_loc_conf_t;
extern ngx_module_t ngx_http_v2_module;
#endif /* _NGX_HTTP_V2_MODULE_H_INCLUDED_ */