diff options
Diffstat (limited to 'nginx/src/http/modules/ngx_http_grpc_module.c')
| -rw-r--r-- | nginx/src/http/modules/ngx_http_grpc_module.c | 4707 |
1 files changed, 4707 insertions, 0 deletions
diff --git a/nginx/src/http/modules/ngx_http_grpc_module.c b/nginx/src/http/modules/ngx_http_grpc_module.c new file mode 100644 index 0000000..62b33fd --- /dev/null +++ b/nginx/src/http/modules/ngx_http_grpc_module.c @@ -0,0 +1,4707 @@ + +/* + * Copyright (C) Maxim Dounin + * Copyright (C) Nginx, Inc. + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_http.h> + + +typedef struct { + ngx_array_t *flushes; + ngx_array_t *lengths; + ngx_array_t *values; + ngx_hash_t hash; +} ngx_http_grpc_headers_t; + + +typedef struct { + ngx_http_upstream_conf_t upstream; + + ngx_http_grpc_headers_t headers; + ngx_array_t *headers_source; + + ngx_str_t host; + ngx_uint_t host_set; + +#if (NGX_HTTP_SSL) + ngx_uint_t ssl; + ngx_uint_t ssl_protocols; + ngx_str_t ssl_ciphers; + ngx_uint_t ssl_verify_depth; + ngx_str_t ssl_trusted_certificate; + ngx_str_t ssl_crl; + ngx_str_t ssl_certificate; + ngx_str_t ssl_certificate_key; + ngx_array_t *ssl_passwords; +#endif +} ngx_http_grpc_loc_conf_t; + + +typedef enum { + ngx_http_grpc_st_start = 0, + ngx_http_grpc_st_length_2, + ngx_http_grpc_st_length_3, + ngx_http_grpc_st_type, + ngx_http_grpc_st_flags, + ngx_http_grpc_st_stream_id, + ngx_http_grpc_st_stream_id_2, + ngx_http_grpc_st_stream_id_3, + ngx_http_grpc_st_stream_id_4, + ngx_http_grpc_st_payload, + ngx_http_grpc_st_padding +} ngx_http_grpc_state_e; + + +typedef struct { + size_t init_window; + size_t send_window; + size_t recv_window; + ngx_uint_t last_stream_id; +} ngx_http_grpc_conn_t; + + +typedef struct { + ngx_http_grpc_state_e state; + ngx_uint_t frame_state; + ngx_uint_t fragment_state; + + ngx_chain_t *in; + ngx_chain_t *out; + ngx_chain_t *free; + ngx_chain_t *busy; + + ngx_http_grpc_conn_t *connection; + + ngx_uint_t id; + + ngx_uint_t pings; + ngx_uint_t settings; + + ssize_t send_window; + size_t recv_window; + + size_t rest; + ngx_uint_t stream_id; + u_char type; + u_char flags; + u_char padding; + + ngx_uint_t error; + ngx_uint_t window_update; + + ngx_uint_t setting_id; + ngx_uint_t setting_value; + + u_char ping_data[8]; + + ngx_uint_t index; + ngx_str_t name; + ngx_str_t value; + + u_char *field_end; + size_t field_length; + size_t field_rest; + u_char field_state; + + unsigned literal:1; + unsigned field_huffman:1; + + unsigned header_sent:1; + unsigned output_closed:1; + unsigned output_blocked:1; + unsigned parsing_headers:1; + unsigned end_stream:1; + unsigned done:1; + unsigned status:1; + + ngx_http_request_t *request; +} ngx_http_grpc_ctx_t; + + +typedef struct { + u_char length_0; + u_char length_1; + u_char length_2; + u_char type; + u_char flags; + u_char stream_id_0; + u_char stream_id_1; + u_char stream_id_2; + u_char stream_id_3; +} ngx_http_grpc_frame_t; + + +static ngx_int_t ngx_http_grpc_create_request(ngx_http_request_t *r); +static ngx_int_t ngx_http_grpc_reinit_request(ngx_http_request_t *r); +static ngx_int_t ngx_http_grpc_body_output_filter(void *data, ngx_chain_t *in); +static ngx_int_t ngx_http_grpc_process_header(ngx_http_request_t *r); +static ngx_int_t ngx_http_grpc_filter_init(void *data); +static ngx_int_t ngx_http_grpc_filter(void *data, ssize_t bytes); + +static ngx_int_t ngx_http_grpc_parse_frame(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx, ngx_buf_t *b); +static ngx_int_t ngx_http_grpc_parse_header(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx, ngx_buf_t *b); +static ngx_int_t ngx_http_grpc_parse_fragment(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx, ngx_buf_t *b); +static ngx_int_t ngx_http_grpc_validate_header_name(ngx_http_request_t *r, + ngx_str_t *s); +static ngx_int_t ngx_http_grpc_validate_header_value(ngx_http_request_t *r, + ngx_str_t *s); +static ngx_int_t ngx_http_grpc_parse_rst_stream(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx, ngx_buf_t *b); +static ngx_int_t ngx_http_grpc_parse_goaway(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx, ngx_buf_t *b); +static ngx_int_t ngx_http_grpc_parse_window_update(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx, ngx_buf_t *b); +static ngx_int_t ngx_http_grpc_parse_settings(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx, ngx_buf_t *b); +static ngx_int_t ngx_http_grpc_parse_ping(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx, ngx_buf_t *b); + +static ngx_int_t ngx_http_grpc_send_settings_ack(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx); +static ngx_int_t ngx_http_grpc_send_ping_ack(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx); +static ngx_int_t ngx_http_grpc_send_window_update(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx); + +static ngx_chain_t *ngx_http_grpc_get_buf(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx); +static ngx_http_grpc_ctx_t *ngx_http_grpc_get_ctx(ngx_http_request_t *r); +static ngx_int_t ngx_http_grpc_get_connection_data(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx, ngx_peer_connection_t *pc); +static void ngx_http_grpc_cleanup(void *data); + +static void ngx_http_grpc_abort_request(ngx_http_request_t *r); +static void ngx_http_grpc_finalize_request(ngx_http_request_t *r, + ngx_int_t rc); + +static ngx_int_t ngx_http_grpc_internal_trailers_variable( + ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data); + +static ngx_int_t ngx_http_grpc_add_variables(ngx_conf_t *cf); +static void *ngx_http_grpc_create_loc_conf(ngx_conf_t *cf); +static char *ngx_http_grpc_merge_loc_conf(ngx_conf_t *cf, + void *parent, void *child); +static ngx_int_t ngx_http_grpc_init_headers(ngx_conf_t *cf, + ngx_http_grpc_loc_conf_t *conf, ngx_http_grpc_headers_t *headers, + ngx_keyval_t *default_headers); + +static char *ngx_http_grpc_pass(ngx_conf_t *cf, ngx_command_t *cmd, + void *conf); + +#if (NGX_HTTP_SSL) +static char *ngx_http_grpc_ssl_password_file(ngx_conf_t *cf, + ngx_command_t *cmd, void *conf); +static ngx_int_t ngx_http_grpc_set_ssl(ngx_conf_t *cf, + ngx_http_grpc_loc_conf_t *glcf); +#endif + + +static ngx_conf_bitmask_t ngx_http_grpc_next_upstream_masks[] = { + { ngx_string("error"), NGX_HTTP_UPSTREAM_FT_ERROR }, + { ngx_string("timeout"), NGX_HTTP_UPSTREAM_FT_TIMEOUT }, + { ngx_string("invalid_header"), NGX_HTTP_UPSTREAM_FT_INVALID_HEADER }, + { ngx_string("non_idempotent"), NGX_HTTP_UPSTREAM_FT_NON_IDEMPOTENT }, + { ngx_string("http_500"), NGX_HTTP_UPSTREAM_FT_HTTP_500 }, + { ngx_string("http_502"), NGX_HTTP_UPSTREAM_FT_HTTP_502 }, + { ngx_string("http_503"), NGX_HTTP_UPSTREAM_FT_HTTP_503 }, + { ngx_string("http_504"), NGX_HTTP_UPSTREAM_FT_HTTP_504 }, + { ngx_string("http_403"), NGX_HTTP_UPSTREAM_FT_HTTP_403 }, + { ngx_string("http_404"), NGX_HTTP_UPSTREAM_FT_HTTP_404 }, + { ngx_string("http_429"), NGX_HTTP_UPSTREAM_FT_HTTP_429 }, + { ngx_string("off"), NGX_HTTP_UPSTREAM_FT_OFF }, + { ngx_null_string, 0 } +}; + + +#if (NGX_HTTP_SSL) + +static ngx_conf_bitmask_t ngx_http_grpc_ssl_protocols[] = { + { ngx_string("SSLv2"), NGX_SSL_SSLv2 }, + { ngx_string("SSLv3"), NGX_SSL_SSLv3 }, + { ngx_string("TLSv1"), NGX_SSL_TLSv1 }, + { ngx_string("TLSv1.1"), NGX_SSL_TLSv1_1 }, + { ngx_string("TLSv1.2"), NGX_SSL_TLSv1_2 }, + { ngx_string("TLSv1.3"), NGX_SSL_TLSv1_3 }, + { ngx_null_string, 0 } +}; + +#endif + + +static ngx_command_t ngx_http_grpc_commands[] = { + + { ngx_string("grpc_pass"), + NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1, + ngx_http_grpc_pass, + NGX_HTTP_LOC_CONF_OFFSET, + 0, + NULL }, + + { ngx_string("grpc_bind"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE12, + ngx_http_upstream_bind_set_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.local), + NULL }, + + { ngx_string("grpc_connect_timeout"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_msec_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.connect_timeout), + NULL }, + + { ngx_string("grpc_send_timeout"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_msec_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.send_timeout), + NULL }, + + { ngx_string("grpc_intercept_errors"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, + ngx_conf_set_flag_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.intercept_errors), + NULL }, + + { ngx_string("grpc_buffer_size"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_size_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.buffer_size), + NULL }, + + { ngx_string("grpc_read_timeout"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_msec_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.read_timeout), + NULL }, + + { ngx_string("grpc_next_upstream"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, + ngx_conf_set_bitmask_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.next_upstream), + &ngx_http_grpc_next_upstream_masks }, + + { ngx_string("grpc_next_upstream_tries"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_num_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.next_upstream_tries), + NULL }, + + { ngx_string("grpc_next_upstream_timeout"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_msec_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.next_upstream_timeout), + NULL }, + + { ngx_string("grpc_set_header"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, + ngx_conf_set_keyval_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, headers_source), + NULL }, + + { ngx_string("grpc_pass_header"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_str_array_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.pass_headers), + NULL }, + + { ngx_string("grpc_hide_header"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_str_array_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.hide_headers), + NULL }, + + { ngx_string("grpc_ignore_headers"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, + ngx_conf_set_bitmask_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.ignore_headers), + &ngx_http_upstream_ignore_headers_masks }, + +#if (NGX_HTTP_SSL) + + { ngx_string("grpc_ssl_session_reuse"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, + ngx_conf_set_flag_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.ssl_session_reuse), + NULL }, + + { ngx_string("grpc_ssl_protocols"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, + ngx_conf_set_bitmask_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, ssl_protocols), + &ngx_http_grpc_ssl_protocols }, + + { ngx_string("grpc_ssl_ciphers"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_str_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, ssl_ciphers), + NULL }, + + { ngx_string("grpc_ssl_name"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_http_set_complex_value_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.ssl_name), + NULL }, + + { ngx_string("grpc_ssl_server_name"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, + ngx_conf_set_flag_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.ssl_server_name), + NULL }, + + { ngx_string("grpc_ssl_verify"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, + ngx_conf_set_flag_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, upstream.ssl_verify), + NULL }, + + { ngx_string("grpc_ssl_verify_depth"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_num_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, ssl_verify_depth), + NULL }, + + { ngx_string("grpc_ssl_trusted_certificate"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_str_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, ssl_trusted_certificate), + NULL }, + + { ngx_string("grpc_ssl_crl"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_str_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, ssl_crl), + NULL }, + + { ngx_string("grpc_ssl_certificate"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_str_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, ssl_certificate), + NULL }, + + { ngx_string("grpc_ssl_certificate_key"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_str_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_grpc_loc_conf_t, ssl_certificate_key), + NULL }, + + { ngx_string("grpc_ssl_password_file"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_http_grpc_ssl_password_file, + NGX_HTTP_LOC_CONF_OFFSET, + 0, + NULL }, + +#endif + + ngx_null_command +}; + + +static ngx_http_module_t ngx_http_grpc_module_ctx = { + ngx_http_grpc_add_variables, /* preconfiguration */ + NULL, /* postconfiguration */ + + NULL, /* create main configuration */ + NULL, /* init main configuration */ + + NULL, /* create server configuration */ + NULL, /* merge server configuration */ + + ngx_http_grpc_create_loc_conf, /* create location configuration */ + ngx_http_grpc_merge_loc_conf /* merge location configuration */ +}; + + +ngx_module_t ngx_http_grpc_module = { + NGX_MODULE_V1, + &ngx_http_grpc_module_ctx, /* module context */ + ngx_http_grpc_commands, /* module directives */ + NGX_HTTP_MODULE, /* module type */ + NULL, /* init master */ + NULL, /* init module */ + NULL, /* init process */ + NULL, /* init thread */ + NULL, /* exit thread */ + NULL, /* exit process */ + NULL, /* exit master */ + NGX_MODULE_V1_PADDING +}; + + +static u_char ngx_http_grpc_connection_start[] = + "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n" /* connection preface */ + + "\x00\x00\x12\x04\x00\x00\x00\x00\x00" /* settings frame */ + "\x00\x01\x00\x00\x00\x00" /* header table size */ + "\x00\x02\x00\x00\x00\x00" /* disable push */ + "\x00\x04\x7f\xff\xff\xff" /* initial window */ + + "\x00\x00\x04\x08\x00\x00\x00\x00\x00" /* window update frame */ + "\x7f\xff\x00\x00"; + + +static ngx_keyval_t ngx_http_grpc_headers[] = { + { ngx_string("Content-Length"), ngx_string("$content_length") }, + { ngx_string("TE"), ngx_string("$grpc_internal_trailers") }, + { ngx_string("Host"), ngx_string("") }, + { ngx_string("Connection"), ngx_string("") }, + { ngx_string("Transfer-Encoding"), ngx_string("") }, + { ngx_string("Keep-Alive"), ngx_string("") }, + { ngx_string("Expect"), ngx_string("") }, + { ngx_string("Upgrade"), ngx_string("") }, + { ngx_null_string, ngx_null_string } +}; + + +static ngx_str_t ngx_http_grpc_hide_headers[] = { + ngx_string("Date"), + ngx_string("Server"), + ngx_string("X-Accel-Expires"), + ngx_string("X-Accel-Redirect"), + ngx_string("X-Accel-Limit-Rate"), + ngx_string("X-Accel-Buffering"), + ngx_string("X-Accel-Charset"), + ngx_null_string +}; + + +static ngx_http_variable_t ngx_http_grpc_vars[] = { + + { ngx_string("grpc_internal_trailers"), NULL, + ngx_http_grpc_internal_trailers_variable, 0, + NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_NOHASH, 0 }, + + ngx_http_null_variable +}; + + +static ngx_int_t +ngx_http_grpc_handler(ngx_http_request_t *r) +{ + ngx_int_t rc; + ngx_http_upstream_t *u; + ngx_http_grpc_ctx_t *ctx; + ngx_http_grpc_loc_conf_t *glcf; + + if (ngx_http_upstream_create(r) != NGX_OK) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + glcf = ngx_http_get_module_loc_conf(r, ngx_http_grpc_module); + + u = r->upstream; + +#if (NGX_HTTP_SSL) + u->ssl = (glcf->upstream.ssl != NULL); + + if (u->ssl) { + ngx_str_set(&u->schema, "grpcs://"); + + } else { + ngx_str_set(&u->schema, "grpc://"); + } +#else + ngx_str_set(&u->schema, "grpc://"); +#endif + + u->output.tag = (ngx_buf_tag_t) &ngx_http_grpc_module; + + u->conf = &glcf->upstream; + + u->create_request = ngx_http_grpc_create_request; + u->reinit_request = ngx_http_grpc_reinit_request; + u->process_header = ngx_http_grpc_process_header; + u->abort_request = ngx_http_grpc_abort_request; + u->finalize_request = ngx_http_grpc_finalize_request; + + ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_grpc_ctx_t)); + if (ctx == NULL) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + ctx->request = r; + + ngx_http_set_ctx(r, ctx, ngx_http_grpc_module); + + u->input_filter_init = ngx_http_grpc_filter_init; + u->input_filter = ngx_http_grpc_filter; + u->input_filter_ctx = ctx; + + r->request_body_no_buffering = 1; + + rc = ngx_http_read_client_request_body(r, ngx_http_upstream_init); + + if (rc >= NGX_HTTP_SPECIAL_RESPONSE) { + return rc; + } + + return NGX_DONE; +} + + +static ngx_int_t +ngx_http_grpc_create_request(ngx_http_request_t *r) +{ + u_char *p, *tmp, *key_tmp, *val_tmp, *headers_frame; + size_t len, tmp_len, key_len, val_len, uri_len; + uintptr_t escape; + ngx_buf_t *b; + ngx_uint_t i, next; + ngx_chain_t *cl, *body; + ngx_list_part_t *part; + ngx_table_elt_t *header; + ngx_http_upstream_t *u; + ngx_http_grpc_frame_t *f; + ngx_http_script_code_pt code; + ngx_http_grpc_loc_conf_t *glcf; + ngx_http_script_engine_t e, le; + ngx_http_script_len_code_pt lcode; + + u = r->upstream; + + glcf = ngx_http_get_module_loc_conf(r, ngx_http_grpc_module); + + len = sizeof(ngx_http_grpc_connection_start) - 1 + + sizeof(ngx_http_grpc_frame_t); /* headers frame */ + + /* :method header */ + + if (r->method == NGX_HTTP_GET || r->method == NGX_HTTP_POST) { + len += 1; + tmp_len = 0; + + } else { + len += 1 + NGX_HTTP_V2_INT_OCTETS + r->method_name.len; + tmp_len = r->method_name.len; + } + + /* :scheme header */ + + len += 1; + + /* :path header */ + + if (r->valid_unparsed_uri) { + escape = 0; + uri_len = r->unparsed_uri.len; + + } else { + escape = 2 * ngx_escape_uri(NULL, r->uri.data, r->uri.len, + NGX_ESCAPE_URI); + uri_len = r->uri.len + escape + sizeof("?") - 1 + r->args.len; + } + + len += 1 + NGX_HTTP_V2_INT_OCTETS + uri_len; + + if (tmp_len < uri_len) { + tmp_len = uri_len; + } + + /* :authority header */ + + if (!glcf->host_set) { + len += 1 + NGX_HTTP_V2_INT_OCTETS + glcf->host.len; + + if (tmp_len < glcf->host.len) { + tmp_len = glcf->host.len; + } + } + + /* other headers */ + + ngx_http_script_flush_no_cacheable_variables(r, glcf->headers.flushes); + ngx_memzero(&le, sizeof(ngx_http_script_engine_t)); + + le.ip = glcf->headers.lengths->elts; + le.request = r; + le.flushed = 1; + + while (*(uintptr_t *) le.ip) { + + lcode = *(ngx_http_script_len_code_pt *) le.ip; + key_len = lcode(&le); + + for (val_len = 0; *(uintptr_t *) le.ip; val_len += lcode(&le)) { + lcode = *(ngx_http_script_len_code_pt *) le.ip; + } + le.ip += sizeof(uintptr_t); + + if (val_len == 0) { + continue; + } + + len += 1 + NGX_HTTP_V2_INT_OCTETS + key_len + + NGX_HTTP_V2_INT_OCTETS + val_len; + + if (tmp_len < key_len) { + tmp_len = key_len; + } + + if (tmp_len < val_len) { + tmp_len = val_len; + } + } + + if (glcf->upstream.pass_request_headers) { + part = &r->headers_in.headers.part; + header = part->elts; + + for (i = 0; /* void */; i++) { + + if (i >= part->nelts) { + if (part->next == NULL) { + break; + } + + part = part->next; + header = part->elts; + i = 0; + } + + if (ngx_hash_find(&glcf->headers.hash, header[i].hash, + header[i].lowcase_key, header[i].key.len)) + { + continue; + } + + len += 1 + NGX_HTTP_V2_INT_OCTETS + header[i].key.len + + NGX_HTTP_V2_INT_OCTETS + header[i].value.len; + + if (tmp_len < header[i].key.len) { + tmp_len = header[i].key.len; + } + + if (tmp_len < header[i].value.len) { + tmp_len = header[i].value.len; + } + } + } + + /* continuation frames */ + + len += sizeof(ngx_http_grpc_frame_t) + * (len / NGX_HTTP_V2_DEFAULT_FRAME_SIZE); + + + b = ngx_create_temp_buf(r->pool, len); + if (b == NULL) { + return NGX_ERROR; + } + + cl = ngx_alloc_chain_link(r->pool); + if (cl == NULL) { + return NGX_ERROR; + } + + cl->buf = b; + cl->next = NULL; + + tmp = ngx_palloc(r->pool, tmp_len * 3); + if (tmp == NULL) { + return NGX_ERROR; + } + + key_tmp = tmp + tmp_len; + val_tmp = tmp + 2 * tmp_len; + + /* connection preface */ + + b->last = ngx_copy(b->last, ngx_http_grpc_connection_start, + sizeof(ngx_http_grpc_connection_start) - 1); + + /* headers frame */ + + headers_frame = b->last; + + f = (ngx_http_grpc_frame_t *) b->last; + b->last += sizeof(ngx_http_grpc_frame_t); + + f->length_0 = 0; + f->length_1 = 0; + f->length_2 = 0; + f->type = NGX_HTTP_V2_HEADERS_FRAME; + f->flags = 0; + f->stream_id_0 = 0; + f->stream_id_1 = 0; + f->stream_id_2 = 0; + f->stream_id_3 = 1; + + if (r->method == NGX_HTTP_GET) { + *b->last++ = ngx_http_v2_indexed(NGX_HTTP_V2_METHOD_GET_INDEX); + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: \":method: GET\""); + + } else if (r->method == NGX_HTTP_POST) { + *b->last++ = ngx_http_v2_indexed(NGX_HTTP_V2_METHOD_POST_INDEX); + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: \":method: POST\""); + + } else { + *b->last++ = ngx_http_v2_inc_indexed(NGX_HTTP_V2_METHOD_INDEX); + b->last = ngx_http_v2_write_value(b->last, r->method_name.data, + r->method_name.len, tmp); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: \":method: %V\"", &r->method_name); + } + +#if (NGX_HTTP_SSL) + if (glcf->ssl) { + *b->last++ = ngx_http_v2_indexed(NGX_HTTP_V2_SCHEME_HTTPS_INDEX); + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: \":scheme: https\""); + } else +#endif + { + *b->last++ = ngx_http_v2_indexed(NGX_HTTP_V2_SCHEME_HTTP_INDEX); + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: \":scheme: http\""); + } + + if (r->valid_unparsed_uri) { + + if (r->unparsed_uri.len == 1 && r->unparsed_uri.data[0] == '/') { + *b->last++ = ngx_http_v2_indexed(NGX_HTTP_V2_PATH_ROOT_INDEX); + + } else { + *b->last++ = ngx_http_v2_inc_indexed(NGX_HTTP_V2_PATH_INDEX); + b->last = ngx_http_v2_write_value(b->last, r->unparsed_uri.data, + r->unparsed_uri.len, tmp); + } + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: \":path: %V\"", &r->unparsed_uri); + + } else if (escape || r->args.len > 0) { + p = val_tmp; + + if (escape) { + p = (u_char *) ngx_escape_uri(p, r->uri.data, r->uri.len, + NGX_ESCAPE_URI); + + } else { + p = ngx_copy(p, r->uri.data, r->uri.len); + } + + if (r->args.len > 0) { + *p++ = '?'; + p = ngx_copy(p, r->args.data, r->args.len); + } + + *b->last++ = ngx_http_v2_inc_indexed(NGX_HTTP_V2_PATH_INDEX); + b->last = ngx_http_v2_write_value(b->last, val_tmp, p - val_tmp, tmp); + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: \":path: %*s\"", p - val_tmp, val_tmp); + + } else { + *b->last++ = ngx_http_v2_inc_indexed(NGX_HTTP_V2_PATH_INDEX); + b->last = ngx_http_v2_write_value(b->last, r->uri.data, + r->uri.len, tmp); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: \":path: %V\"", &r->uri); + } + + if (!glcf->host_set) { + *b->last++ = ngx_http_v2_inc_indexed(NGX_HTTP_V2_AUTHORITY_INDEX); + b->last = ngx_http_v2_write_value(b->last, glcf->host.data, + glcf->host.len, tmp); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: \":authority: %V\"", &glcf->host); + } + + ngx_memzero(&e, sizeof(ngx_http_script_engine_t)); + + e.ip = glcf->headers.values->elts; + e.request = r; + e.flushed = 1; + + le.ip = glcf->headers.lengths->elts; + + while (*(uintptr_t *) le.ip) { + + lcode = *(ngx_http_script_len_code_pt *) le.ip; + key_len = lcode(&le); + + for (val_len = 0; *(uintptr_t *) le.ip; val_len += lcode(&le)) { + lcode = *(ngx_http_script_len_code_pt *) le.ip; + } + le.ip += sizeof(uintptr_t); + + if (val_len == 0) { + e.skip = 1; + + while (*(uintptr_t *) e.ip) { + code = *(ngx_http_script_code_pt *) e.ip; + code((ngx_http_script_engine_t *) &e); + } + e.ip += sizeof(uintptr_t); + + e.skip = 0; + + continue; + } + + *b->last++ = 0; + + e.pos = key_tmp; + + code = *(ngx_http_script_code_pt *) e.ip; + code((ngx_http_script_engine_t *) &e); + + b->last = ngx_http_v2_write_name(b->last, key_tmp, key_len, tmp); + + e.pos = val_tmp; + + while (*(uintptr_t *) e.ip) { + code = *(ngx_http_script_code_pt *) e.ip; + code((ngx_http_script_engine_t *) &e); + } + e.ip += sizeof(uintptr_t); + + b->last = ngx_http_v2_write_value(b->last, val_tmp, val_len, tmp); + +#if (NGX_DEBUG) + if (r->connection->log->log_level & NGX_LOG_DEBUG_HTTP) { + ngx_strlow(key_tmp, key_tmp, key_len); + + ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: \"%*s: %*s\"", + key_len, key_tmp, val_len, val_tmp); + } +#endif + } + + if (glcf->upstream.pass_request_headers) { + part = &r->headers_in.headers.part; + header = part->elts; + + for (i = 0; /* void */; i++) { + + if (i >= part->nelts) { + if (part->next == NULL) { + break; + } + + part = part->next; + header = part->elts; + i = 0; + } + + if (ngx_hash_find(&glcf->headers.hash, header[i].hash, + header[i].lowcase_key, header[i].key.len)) + { + continue; + } + + *b->last++ = 0; + + b->last = ngx_http_v2_write_name(b->last, header[i].key.data, + header[i].key.len, tmp); + + b->last = ngx_http_v2_write_value(b->last, header[i].value.data, + header[i].value.len, tmp); + +#if (NGX_DEBUG) + if (r->connection->log->log_level & NGX_LOG_DEBUG_HTTP) { + ngx_strlow(tmp, header[i].key.data, header[i].key.len); + + ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: \"%*s: %V\"", + header[i].key.len, tmp, &header[i].value); + } +#endif + } + } + + /* update headers frame length */ + + len = b->last - headers_frame - sizeof(ngx_http_grpc_frame_t); + + if (len > NGX_HTTP_V2_DEFAULT_FRAME_SIZE) { + len = NGX_HTTP_V2_DEFAULT_FRAME_SIZE; + next = 1; + + } else { + next = 0; + } + + f = (ngx_http_grpc_frame_t *) headers_frame; + + f->length_0 = (u_char) ((len >> 16) & 0xff); + f->length_1 = (u_char) ((len >> 8) & 0xff); + f->length_2 = (u_char) (len & 0xff); + + /* create additional continuation frames */ + + p = headers_frame; + + while (next) { + p += sizeof(ngx_http_grpc_frame_t) + NGX_HTTP_V2_DEFAULT_FRAME_SIZE; + len = b->last - p; + + ngx_memmove(p + sizeof(ngx_http_grpc_frame_t), p, len); + b->last += sizeof(ngx_http_grpc_frame_t); + + if (len > NGX_HTTP_V2_DEFAULT_FRAME_SIZE) { + len = NGX_HTTP_V2_DEFAULT_FRAME_SIZE; + next = 1; + + } else { + next = 0; + } + + f = (ngx_http_grpc_frame_t *) p; + + f->length_0 = (u_char) ((len >> 16) & 0xff); + f->length_1 = (u_char) ((len >> 8) & 0xff); + f->length_2 = (u_char) (len & 0xff); + f->type = NGX_HTTP_V2_CONTINUATION_FRAME; + f->flags = 0; + f->stream_id_0 = 0; + f->stream_id_1 = 0; + f->stream_id_2 = 0; + f->stream_id_3 = 1; + } + + f->flags |= NGX_HTTP_V2_END_HEADERS_FLAG; + +#if (NGX_DEBUG) + if (r->connection->log->log_level & NGX_LOG_DEBUG_HTTP) { + u_char buf[512]; + size_t n, m; + + n = ngx_min(b->last - b->pos, 256); + m = ngx_hex_dump(buf, b->pos, n) - buf; + + ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: %*s%s, len: %uz", + m, buf, b->last - b->pos > 256 ? "..." : "", + b->last - b->pos); + } +#endif + + if (r->request_body_no_buffering) { + + u->request_bufs = cl; + + } else { + + body = u->request_bufs; + u->request_bufs = cl; + + if (body == NULL) { + f = (ngx_http_grpc_frame_t *) headers_frame; + f->flags |= NGX_HTTP_V2_END_STREAM_FLAG; + } + + while (body) { + b = ngx_alloc_buf(r->pool); + if (b == NULL) { + return NGX_ERROR; + } + + ngx_memcpy(b, body->buf, sizeof(ngx_buf_t)); + + cl->next = ngx_alloc_chain_link(r->pool); + if (cl->next == NULL) { + return NGX_ERROR; + } + + cl = cl->next; + cl->buf = b; + + body = body->next; + } + + b->last_buf = 1; + } + + u->output.output_filter = ngx_http_grpc_body_output_filter; + u->output.filter_ctx = r; + + b->flush = 1; + cl->next = NULL; + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_grpc_reinit_request(ngx_http_request_t *r) +{ + ngx_http_grpc_ctx_t *ctx; + + ctx = ngx_http_get_module_ctx(r, ngx_http_grpc_module); + + if (ctx == NULL) { + return NGX_OK; + } + + ctx->state = 0; + ctx->header_sent = 0; + ctx->output_closed = 0; + ctx->output_blocked = 0; + ctx->parsing_headers = 0; + ctx->end_stream = 0; + ctx->done = 0; + ctx->status = 0; + ctx->connection = NULL; + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_grpc_body_output_filter(void *data, ngx_chain_t *in) +{ + ngx_http_request_t *r = data; + + off_t file_pos; + u_char *p, *pos, *start; + size_t len, limit; + ngx_buf_t *b; + ngx_int_t rc; + ngx_uint_t next, last; + ngx_chain_t *cl, *out, **ll; + ngx_http_upstream_t *u; + ngx_http_grpc_ctx_t *ctx; + ngx_http_grpc_frame_t *f; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc output filter"); + + ctx = ngx_http_grpc_get_ctx(r); + + if (ctx == NULL) { + return NGX_ERROR; + } + + if (in) { + if (ngx_chain_add_copy(r->pool, &ctx->in, in) != NGX_OK) { + return NGX_ERROR; + } + } + + out = NULL; + ll = &out; + + if (!ctx->header_sent) { + /* first buffer contains headers */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc output header"); + + ctx->header_sent = 1; + + if (ctx->id != 1) { + /* + * keepalive connection: skip connection preface, + * update stream identifiers + */ + + b = ctx->in->buf; + b->pos += sizeof(ngx_http_grpc_connection_start) - 1; + + p = b->pos; + + while (p < b->last) { + f = (ngx_http_grpc_frame_t *) p; + p += sizeof(ngx_http_grpc_frame_t); + + f->stream_id_0 = (u_char) ((ctx->id >> 24) & 0xff); + f->stream_id_1 = (u_char) ((ctx->id >> 16) & 0xff); + f->stream_id_2 = (u_char) ((ctx->id >> 8) & 0xff); + f->stream_id_3 = (u_char) (ctx->id & 0xff); + + p += (f->length_0 << 16) + (f->length_1 << 8) + f->length_2; + } + } + + if (ctx->in->buf->last_buf) { + ctx->output_closed = 1; + } + + *ll = ctx->in; + ll = &ctx->in->next; + + ctx->in = ctx->in->next; + } + + if (ctx->out) { + /* queued control frames */ + + *ll = ctx->out; + + for (cl = ctx->out, ll = &cl->next; cl; cl = cl->next) { + ll = &cl->next; + } + + ctx->out = NULL; + } + + f = NULL; + last = 0; + + limit = ngx_max(0, ctx->send_window); + + if (limit > ctx->connection->send_window) { + limit = ctx->connection->send_window; + } + + ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc output limit: %uz w:%z:%uz", + limit, ctx->send_window, ctx->connection->send_window); + +#if (NGX_SUPPRESS_WARN) + file_pos = 0; + pos = NULL; + cl = NULL; +#endif + + in = ctx->in; + + while (in && limit > 0) { + + ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0, + "grpc output in l:%d f:%d %p, pos %p, size: %z " + "file: %O, size: %O", + in->buf->last_buf, + in->buf->in_file, + in->buf->start, in->buf->pos, + in->buf->last - in->buf->pos, + in->buf->file_pos, + in->buf->file_last - in->buf->file_pos); + + if (ngx_buf_special(in->buf)) { + goto next; + } + + if (in->buf->in_file) { + file_pos = in->buf->file_pos; + + } else { + pos = in->buf->pos; + } + + next = 0; + + do { + + cl = ngx_http_grpc_get_buf(r, ctx); + if (cl == NULL) { + return NGX_ERROR; + } + + b = cl->buf; + + f = (ngx_http_grpc_frame_t *) b->last; + b->last += sizeof(ngx_http_grpc_frame_t); + + *ll = cl; + ll = &cl->next; + + cl = ngx_chain_get_free_buf(r->pool, &ctx->free); + if (cl == NULL) { + return NGX_ERROR; + } + + b = cl->buf; + start = b->start; + + ngx_memcpy(b, in->buf, sizeof(ngx_buf_t)); + + /* + * restore b->start to preserve memory allocated in the buffer, + * to reuse it later for headers and control frames + */ + + b->start = start; + + if (in->buf->in_file) { + b->file_pos = file_pos; + file_pos += ngx_min(NGX_HTTP_V2_DEFAULT_FRAME_SIZE, limit); + + if (file_pos >= in->buf->file_last) { + file_pos = in->buf->file_last; + next = 1; + } + + b->file_last = file_pos; + len = (ngx_uint_t) (file_pos - b->file_pos); + + } else { + b->pos = pos; + pos += ngx_min(NGX_HTTP_V2_DEFAULT_FRAME_SIZE, limit); + + if (pos >= in->buf->last) { + pos = in->buf->last; + next = 1; + } + + b->last = pos; + len = (ngx_uint_t) (pos - b->pos); + } + + b->tag = (ngx_buf_tag_t) &ngx_http_grpc_body_output_filter; + b->shadow = in->buf; + b->last_shadow = next; + + b->last_buf = 0; + b->last_in_chain = 0; + + *ll = cl; + ll = &cl->next; + + f->length_0 = (u_char) ((len >> 16) & 0xff); + f->length_1 = (u_char) ((len >> 8) & 0xff); + f->length_2 = (u_char) (len & 0xff); + f->type = NGX_HTTP_V2_DATA_FRAME; + f->flags = 0; + f->stream_id_0 = (u_char) ((ctx->id >> 24) & 0xff); + f->stream_id_1 = (u_char) ((ctx->id >> 16) & 0xff); + f->stream_id_2 = (u_char) ((ctx->id >> 8) & 0xff); + f->stream_id_3 = (u_char) (ctx->id & 0xff); + + limit -= len; + ctx->send_window -= len; + ctx->connection->send_window -= len; + + } while (!next && limit > 0); + + if (!next) { + /* + * if the buffer wasn't fully sent due to flow control limits, + * preserve position for future use + */ + + if (in->buf->in_file) { + in->buf->file_pos = file_pos; + + } else { + in->buf->pos = pos; + } + + break; + } + + next: + + if (in->buf->last_buf) { + last = 1; + } + + in = in->next; + } + + ctx->in = in; + + if (last) { + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc output last"); + + ctx->output_closed = 1; + + if (f) { + f->flags |= NGX_HTTP_V2_END_STREAM_FLAG; + + } else { + cl = ngx_http_grpc_get_buf(r, ctx); + if (cl == NULL) { + return NGX_ERROR; + } + + b = cl->buf; + + f = (ngx_http_grpc_frame_t *) b->last; + b->last += sizeof(ngx_http_grpc_frame_t); + + f->length_0 = 0; + f->length_1 = 0; + f->length_2 = 0; + f->type = NGX_HTTP_V2_DATA_FRAME; + f->flags = NGX_HTTP_V2_END_STREAM_FLAG; + f->stream_id_0 = (u_char) ((ctx->id >> 24) & 0xff); + f->stream_id_1 = (u_char) ((ctx->id >> 16) & 0xff); + f->stream_id_2 = (u_char) ((ctx->id >> 8) & 0xff); + f->stream_id_3 = (u_char) (ctx->id & 0xff); + + *ll = cl; + ll = &cl->next; + } + + cl->buf->last_buf = 1; + } + + *ll = NULL; + +#if (NGX_DEBUG) + + for (cl = out; cl; cl = cl->next) { + ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0, + "grpc output out l:%d f:%d %p, pos %p, size: %z " + "file: %O, size: %O", + cl->buf->last_buf, + cl->buf->in_file, + cl->buf->start, cl->buf->pos, + cl->buf->last - cl->buf->pos, + cl->buf->file_pos, + cl->buf->file_last - cl->buf->file_pos); + } + + ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc output limit: %uz w:%z:%uz", + limit, ctx->send_window, ctx->connection->send_window); + +#endif + + rc = ngx_chain_writer(&r->upstream->writer, out); + + ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &out, + (ngx_buf_tag_t) &ngx_http_grpc_body_output_filter); + + for (cl = ctx->free; cl; cl = cl->next) { + + /* mark original buffers as sent */ + + if (cl->buf->shadow) { + if (cl->buf->last_shadow) { + b = cl->buf->shadow; + b->pos = b->last; + } + + cl->buf->shadow = NULL; + } + } + + if (rc == NGX_OK && ctx->in) { + rc = NGX_AGAIN; + } + + if (rc == NGX_AGAIN) { + ctx->output_blocked = 1; + + } else { + ctx->output_blocked = 0; + } + + if (ctx->done) { + + /* + * We have already got the response and were sending some additional + * control frames. Even if there is still something unsent, stop + * here anyway. + */ + + u = r->upstream; + u->length = 0; + + if (ctx->in == NULL + && ctx->out == NULL + && ctx->output_closed + && !ctx->output_blocked + && ctx->state == ngx_http_grpc_st_start) + { + u->keepalive = 1; + } + + ngx_post_event(u->peer.connection->read, &ngx_posted_events); + } + + return rc; +} + + +static ngx_int_t +ngx_http_grpc_process_header(ngx_http_request_t *r) +{ + ngx_str_t *status_line; + ngx_int_t rc, status; + ngx_buf_t *b; + ngx_table_elt_t *h; + ngx_http_upstream_t *u; + ngx_http_grpc_ctx_t *ctx; + ngx_http_upstream_header_t *hh; + ngx_http_upstream_main_conf_t *umcf; + + u = r->upstream; + b = &u->buffer; + +#if (NGX_DEBUG) + if (r->connection->log->log_level & NGX_LOG_DEBUG_HTTP) { + u_char buf[512]; + size_t n, m; + + n = ngx_min(b->last - b->pos, 256); + m = ngx_hex_dump(buf, b->pos, n) - buf; + + ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc response: %*s%s, len: %uz", + m, buf, b->last - b->pos > 256 ? "..." : "", + b->last - b->pos); + } +#endif + + ctx = ngx_http_grpc_get_ctx(r); + + if (ctx == NULL) { + return NGX_ERROR; + } + + umcf = ngx_http_get_module_main_conf(r, ngx_http_upstream_module); + + for ( ;; ) { + + if (ctx->state < ngx_http_grpc_st_payload) { + + rc = ngx_http_grpc_parse_frame(r, ctx, b); + + if (rc == NGX_AGAIN) { + + /* + * there can be a lot of window update frames, + * so we reset buffer if it is empty and we haven't + * started parsing headers yet + */ + + if (!ctx->parsing_headers) { + b->pos = b->start; + b->last = b->pos; + } + + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + /* + * RFC 7540 says that implementations MUST discard frames + * that have unknown or unsupported types. However, extension + * frames that appear in the middle of a header block are + * not permitted. Also, for obvious reasons CONTINUATION frames + * cannot appear before headers, and DATA frames are not expected + * to appear before all headers are parsed. + */ + + if (ctx->type == NGX_HTTP_V2_DATA_FRAME + || (ctx->type == NGX_HTTP_V2_CONTINUATION_FRAME + && !ctx->parsing_headers) + || (ctx->type != NGX_HTTP_V2_CONTINUATION_FRAME + && ctx->parsing_headers)) + { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent unexpected http2 frame: %d", + ctx->type); + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + if (ctx->stream_id && ctx->stream_id != ctx->id) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent frame for unknown stream %ui", + ctx->stream_id); + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + } + + /* frame payload */ + + if (ctx->type == NGX_HTTP_V2_RST_STREAM_FRAME) { + + rc = ngx_http_grpc_parse_rst_stream(r, ctx, b); + + if (rc == NGX_AGAIN) { + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream rejected request with error %ui", + ctx->error); + + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + if (ctx->type == NGX_HTTP_V2_GOAWAY_FRAME) { + + rc = ngx_http_grpc_parse_goaway(r, ctx, b); + + if (rc == NGX_AGAIN) { + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + /* + * If stream_id is lower than one we use, our + * request won't be processed and needs to be retried. + * If stream_id is greater or equal to the one we use, + * we can continue normally (except we can't use this + * connection for additional requests). If there is + * a real error, the connection will be closed. + */ + + if (ctx->stream_id < ctx->id) { + + /* TODO: we can retry non-idempotent requests */ + + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent goaway with error %ui", + ctx->error); + + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + continue; + } + + if (ctx->type == NGX_HTTP_V2_WINDOW_UPDATE_FRAME) { + + rc = ngx_http_grpc_parse_window_update(r, ctx, b); + + if (rc == NGX_AGAIN) { + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + if (ctx->in) { + ngx_post_event(u->peer.connection->write, &ngx_posted_events); + } + + continue; + } + + if (ctx->type == NGX_HTTP_V2_SETTINGS_FRAME) { + + rc = ngx_http_grpc_parse_settings(r, ctx, b); + + if (rc == NGX_AGAIN) { + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + if (ctx->in) { + ngx_post_event(u->peer.connection->write, &ngx_posted_events); + } + + continue; + } + + if (ctx->type == NGX_HTTP_V2_PING_FRAME) { + + rc = ngx_http_grpc_parse_ping(r, ctx, b); + + if (rc == NGX_AGAIN) { + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + ngx_post_event(u->peer.connection->write, &ngx_posted_events); + continue; + } + + if (ctx->type == NGX_HTTP_V2_PUSH_PROMISE_FRAME) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent unexpected push promise frame"); + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + if (ctx->type != NGX_HTTP_V2_HEADERS_FRAME + && ctx->type != NGX_HTTP_V2_CONTINUATION_FRAME) + { + /* priority, unknown frames */ + + if (b->last - b->pos < (ssize_t) ctx->rest) { + ctx->rest -= b->last - b->pos; + b->pos = b->last; + return NGX_AGAIN; + } + + b->pos += ctx->rest; + ctx->rest = 0; + ctx->state = ngx_http_grpc_st_start; + + continue; + } + + /* headers */ + + for ( ;; ) { + + rc = ngx_http_grpc_parse_header(r, ctx, b); + + if (rc == NGX_AGAIN) { + break; + } + + if (rc == NGX_OK) { + + /* a header line has been parsed successfully */ + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header: \"%V: %V\"", + &ctx->name, &ctx->value); + + if (ctx->name.len && ctx->name.data[0] == ':') { + + if (ctx->name.len != sizeof(":status") - 1 + || ngx_strncmp(ctx->name.data, ":status", + sizeof(":status") - 1) + != 0) + { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid header \"%V: %V\"", + &ctx->name, &ctx->value); + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + if (ctx->status) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent duplicate :status header"); + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + status_line = &ctx->value; + + if (status_line->len != 3) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid :status \"%V\"", + status_line); + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + status = ngx_atoi(status_line->data, 3); + + if (status == NGX_ERROR) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid :status \"%V\"", + status_line); + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + if (status < NGX_HTTP_OK) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent unexpected :status \"%V\"", + status_line); + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + u->headers_in.status_n = status; + + if (u->state && u->state->status == 0) { + u->state->status = status; + } + + ctx->status = 1; + + continue; + + } else if (!ctx->status) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent no :status header"); + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + h = ngx_list_push(&u->headers_in.headers); + if (h == NULL) { + return NGX_ERROR; + } + + h->key = ctx->name; + h->value = ctx->value; + h->lowcase_key = h->key.data; + h->hash = ngx_hash_key(h->key.data, h->key.len); + + hh = ngx_hash_find(&umcf->headers_in_hash, h->hash, + h->lowcase_key, h->key.len); + + if (hh && hh->handler(r, h, hh->offset) != NGX_OK) { + return NGX_ERROR; + } + + continue; + } + + if (rc == NGX_HTTP_PARSE_HEADER_DONE) { + + /* a whole header has been parsed successfully */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header done"); + + if (ctx->end_stream) { + u->headers_in.content_length_n = 0; + + if (ctx->in == NULL + && ctx->out == NULL + && ctx->output_closed + && !ctx->output_blocked + && b->last == b->pos) + { + u->keepalive = 1; + } + } + + return NGX_OK; + } + + /* there was error while a header line parsing */ + + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid header"); + + return NGX_HTTP_UPSTREAM_INVALID_HEADER; + } + + /* rc == NGX_AGAIN */ + + if (ctx->rest == 0) { + ctx->state = ngx_http_grpc_st_start; + continue; + } + + return NGX_AGAIN; + } +} + + +static ngx_int_t +ngx_http_grpc_filter_init(void *data) +{ + ngx_http_grpc_ctx_t *ctx = data; + + ngx_http_request_t *r; + ngx_http_upstream_t *u; + + r = ctx->request; + u = r->upstream; + + u->length = 1; + + if (ctx->end_stream) { + u->length = 0; + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_grpc_filter(void *data, ssize_t bytes) +{ + ngx_http_grpc_ctx_t *ctx = data; + + ngx_int_t rc; + ngx_buf_t *b, *buf; + ngx_chain_t *cl, **ll; + ngx_table_elt_t *h; + ngx_http_request_t *r; + ngx_http_upstream_t *u; + + r = ctx->request; + u = r->upstream; + b = &u->buffer; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc filter bytes:%z", bytes); + + b->pos = b->last; + b->last += bytes; + + for (cl = u->out_bufs, ll = &u->out_bufs; cl; cl = cl->next) { + ll = &cl->next; + } + + for ( ;; ) { + + if (ctx->state < ngx_http_grpc_st_payload) { + + rc = ngx_http_grpc_parse_frame(r, ctx, b); + + if (rc == NGX_AGAIN) { + + if (ctx->done) { + + /* + * We have finished parsing the response and the + * remaining control frames. If there are unsent + * control frames, post a write event to send them. + */ + + if (ctx->out) { + ngx_post_event(u->peer.connection->write, + &ngx_posted_events); + return NGX_AGAIN; + } + + u->length = 0; + + if (ctx->in == NULL + && ctx->output_closed + && !ctx->output_blocked + && ctx->state == ngx_http_grpc_st_start) + { + u->keepalive = 1; + } + + break; + } + + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_ERROR; + } + + if ((ctx->type == NGX_HTTP_V2_CONTINUATION_FRAME + && !ctx->parsing_headers) + || (ctx->type != NGX_HTTP_V2_CONTINUATION_FRAME + && ctx->parsing_headers)) + { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent unexpected http2 frame: %d", + ctx->type); + return NGX_ERROR; + } + + if (ctx->type == NGX_HTTP_V2_DATA_FRAME) { + + if (ctx->stream_id != ctx->id) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent data frame " + "for unknown stream %ui", + ctx->stream_id); + return NGX_ERROR; + } + + if (ctx->rest > ctx->recv_window) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream violated stream flow control, " + "received %uz data frame with window %uz", + ctx->rest, ctx->recv_window); + return NGX_ERROR; + } + + if (ctx->rest > ctx->connection->recv_window) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream violated connection flow control, " + "received %uz data frame with window %uz", + ctx->rest, ctx->connection->recv_window); + return NGX_ERROR; + } + + ctx->recv_window -= ctx->rest; + ctx->connection->recv_window -= ctx->rest; + + if (ctx->connection->recv_window < NGX_HTTP_V2_MAX_WINDOW / 4 + || ctx->recv_window < NGX_HTTP_V2_MAX_WINDOW / 4) + { + if (ngx_http_grpc_send_window_update(r, ctx) != NGX_OK) { + return NGX_ERROR; + } + + ngx_post_event(u->peer.connection->write, + &ngx_posted_events); + } + } + + if (ctx->stream_id && ctx->stream_id != ctx->id) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent frame for unknown stream %ui", + ctx->stream_id); + return NGX_ERROR; + } + + if (ctx->stream_id && ctx->done) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent frame for closed stream %ui", + ctx->stream_id); + return NGX_ERROR; + } + + ctx->padding = 0; + } + + if (ctx->state == ngx_http_grpc_st_padding) { + + if (b->last - b->pos < (ssize_t) ctx->rest) { + ctx->rest -= b->last - b->pos; + b->pos = b->last; + return NGX_AGAIN; + } + + b->pos += ctx->rest; + ctx->rest = 0; + ctx->state = ngx_http_grpc_st_start; + + if (ctx->flags & NGX_HTTP_V2_END_STREAM_FLAG) { + ctx->done = 1; + } + + continue; + } + + /* frame payload */ + + if (ctx->type == NGX_HTTP_V2_RST_STREAM_FRAME) { + + rc = ngx_http_grpc_parse_rst_stream(r, ctx, b); + + if (rc == NGX_AGAIN) { + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_ERROR; + } + + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream rejected request with error %ui", + ctx->error); + + return NGX_ERROR; + } + + if (ctx->type == NGX_HTTP_V2_GOAWAY_FRAME) { + + rc = ngx_http_grpc_parse_goaway(r, ctx, b); + + if (rc == NGX_AGAIN) { + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_ERROR; + } + + /* + * If stream_id is lower than one we use, our + * request won't be processed and needs to be retried. + * If stream_id is greater or equal to the one we use, + * we can continue normally (except we can't use this + * connection for additional requests). If there is + * a real error, the connection will be closed. + */ + + if (ctx->stream_id < ctx->id) { + + /* TODO: we can retry non-idempotent requests */ + + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent goaway with error %ui", + ctx->error); + + return NGX_ERROR; + } + + continue; + } + + if (ctx->type == NGX_HTTP_V2_WINDOW_UPDATE_FRAME) { + + rc = ngx_http_grpc_parse_window_update(r, ctx, b); + + if (rc == NGX_AGAIN) { + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_ERROR; + } + + if (ctx->in) { + ngx_post_event(u->peer.connection->write, &ngx_posted_events); + } + + continue; + } + + if (ctx->type == NGX_HTTP_V2_SETTINGS_FRAME) { + + rc = ngx_http_grpc_parse_settings(r, ctx, b); + + if (rc == NGX_AGAIN) { + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_ERROR; + } + + if (ctx->in) { + ngx_post_event(u->peer.connection->write, &ngx_posted_events); + } + + continue; + } + + if (ctx->type == NGX_HTTP_V2_PING_FRAME) { + + rc = ngx_http_grpc_parse_ping(r, ctx, b); + + if (rc == NGX_AGAIN) { + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_ERROR; + } + + ngx_post_event(u->peer.connection->write, &ngx_posted_events); + continue; + } + + if (ctx->type == NGX_HTTP_V2_PUSH_PROMISE_FRAME) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent unexpected push promise frame"); + return NGX_ERROR; + } + + if (ctx->type == NGX_HTTP_V2_HEADERS_FRAME + || ctx->type == NGX_HTTP_V2_CONTINUATION_FRAME) + { + for ( ;; ) { + + rc = ngx_http_grpc_parse_header(r, ctx, b); + + if (rc == NGX_AGAIN) { + break; + } + + if (rc == NGX_OK) { + + /* a header line has been parsed successfully */ + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc trailer: \"%V: %V\"", + &ctx->name, &ctx->value); + + if (ctx->name.len && ctx->name.data[0] == ':') { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid " + "trailer \"%V: %V\"", + &ctx->name, &ctx->value); + return NGX_ERROR; + } + + h = ngx_list_push(&u->headers_in.trailers); + if (h == NULL) { + return NGX_ERROR; + } + + h->key = ctx->name; + h->value = ctx->value; + h->lowcase_key = h->key.data; + h->hash = ngx_hash_key(h->key.data, h->key.len); + + continue; + } + + if (rc == NGX_HTTP_PARSE_HEADER_DONE) { + + /* a whole header has been parsed successfully */ + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc trailer done"); + + if (ctx->end_stream) { + ctx->done = 1; + break; + } + + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent trailer without " + "end stream flag"); + return NGX_ERROR; + } + + /* there was error while a header line parsing */ + + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid trailer"); + + return NGX_ERROR; + } + + if (rc == NGX_HTTP_PARSE_HEADER_DONE) { + continue; + } + + /* rc == NGX_AGAIN */ + + if (ctx->rest == 0) { + ctx->state = ngx_http_grpc_st_start; + continue; + } + + return NGX_AGAIN; + } + + if (ctx->type != NGX_HTTP_V2_DATA_FRAME) { + + /* priority, unknown frames */ + + if (b->last - b->pos < (ssize_t) ctx->rest) { + ctx->rest -= b->last - b->pos; + b->pos = b->last; + return NGX_AGAIN; + } + + b->pos += ctx->rest; + ctx->rest = 0; + ctx->state = ngx_http_grpc_st_start; + + continue; + } + + /* + * data frame: + * + * +---------------+ + * |Pad Length? (8)| + * +---------------+-----------------------------------------------+ + * | Data (*) ... + * +---------------------------------------------------------------+ + * | Padding (*) ... + * +---------------------------------------------------------------+ + */ + + if (ctx->flags & NGX_HTTP_V2_PADDED_FLAG) { + + if (ctx->rest == 0) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent too short http2 frame"); + return NGX_ERROR; + } + + if (b->pos == b->last) { + return NGX_AGAIN; + } + + ctx->flags &= ~NGX_HTTP_V2_PADDED_FLAG; + ctx->padding = *b->pos++; + ctx->rest -= 1; + + if (ctx->padding > ctx->rest) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent http2 frame with too long " + "padding: %d in frame %uz", + ctx->padding, ctx->rest); + return NGX_ERROR; + } + + continue; + } + + if (ctx->rest == ctx->padding) { + goto done; + } + + if (b->pos == b->last) { + return NGX_AGAIN; + } + + cl = ngx_chain_get_free_buf(r->pool, &u->free_bufs); + if (cl == NULL) { + return NGX_ERROR; + } + + *ll = cl; + ll = &cl->next; + + buf = cl->buf; + + buf->flush = 1; + buf->memory = 1; + + buf->pos = b->pos; + buf->tag = u->output.tag; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc output buf %p", buf->pos); + + if (b->last - b->pos < (ssize_t) ctx->rest - ctx->padding) { + + ctx->rest -= b->last - b->pos; + b->pos = b->last; + buf->last = b->pos; + + return NGX_AGAIN; + } + + b->pos += ctx->rest - ctx->padding; + buf->last = b->pos; + ctx->rest = ctx->padding; + + done: + + if (ctx->padding) { + ctx->state = ngx_http_grpc_st_padding; + continue; + } + + ctx->state = ngx_http_grpc_st_start; + + if (ctx->flags & NGX_HTTP_V2_END_STREAM_FLAG) { + ctx->done = 1; + } + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_grpc_parse_frame(ngx_http_request_t *r, ngx_http_grpc_ctx_t *ctx, + ngx_buf_t *b) +{ + u_char ch, *p; + ngx_http_grpc_state_e state; + + state = ctx->state; + + for (p = b->pos; p < b->last; p++) { + ch = *p; + +#if 0 + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc frame byte: %02Xd, s:%d", ch, state); +#endif + + switch (state) { + + case ngx_http_grpc_st_start: + ctx->rest = ch << 16; + state = ngx_http_grpc_st_length_2; + break; + + case ngx_http_grpc_st_length_2: + ctx->rest |= ch << 8; + state = ngx_http_grpc_st_length_3; + break; + + case ngx_http_grpc_st_length_3: + ctx->rest |= ch; + + if (ctx->rest > NGX_HTTP_V2_DEFAULT_FRAME_SIZE) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent too large http2 frame: %uz", + ctx->rest); + return NGX_ERROR; + } + + state = ngx_http_grpc_st_type; + break; + + case ngx_http_grpc_st_type: + ctx->type = ch; + state = ngx_http_grpc_st_flags; + break; + + case ngx_http_grpc_st_flags: + ctx->flags = ch; + state = ngx_http_grpc_st_stream_id; + break; + + case ngx_http_grpc_st_stream_id: + ctx->stream_id = (ch & 0x7f) << 24; + state = ngx_http_grpc_st_stream_id_2; + break; + + case ngx_http_grpc_st_stream_id_2: + ctx->stream_id |= ch << 16; + state = ngx_http_grpc_st_stream_id_3; + break; + + case ngx_http_grpc_st_stream_id_3: + ctx->stream_id |= ch << 8; + state = ngx_http_grpc_st_stream_id_4; + break; + + case ngx_http_grpc_st_stream_id_4: + ctx->stream_id |= ch; + + ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc frame: %d, len: %uz, f:%d, i:%ui", + ctx->type, ctx->rest, ctx->flags, ctx->stream_id); + + b->pos = p + 1; + + ctx->state = ngx_http_grpc_st_payload; + ctx->frame_state = 0; + + return NGX_OK; + + /* suppress warning */ + case ngx_http_grpc_st_payload: + case ngx_http_grpc_st_padding: + break; + } + } + + b->pos = p; + ctx->state = state; + + return NGX_AGAIN; +} + + +static ngx_int_t +ngx_http_grpc_parse_header(ngx_http_request_t *r, ngx_http_grpc_ctx_t *ctx, + ngx_buf_t *b) +{ + u_char ch, *p, *last; + size_t min; + ngx_int_t rc; + enum { + sw_start = 0, + sw_padding_length, + sw_dependency, + sw_dependency_2, + sw_dependency_3, + sw_dependency_4, + sw_weight, + sw_fragment, + sw_padding + } state; + + state = ctx->frame_state; + + if (state == sw_start) { + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc parse header: start"); + + if (ctx->type == NGX_HTTP_V2_HEADERS_FRAME) { + ctx->parsing_headers = 1; + ctx->fragment_state = 0; + + min = (ctx->flags & NGX_HTTP_V2_PADDED_FLAG ? 1 : 0) + + (ctx->flags & NGX_HTTP_V2_PRIORITY_FLAG ? 5 : 0); + + if (ctx->rest < min) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent headers frame " + "with invalid length: %uz", + ctx->rest); + return NGX_ERROR; + } + + if (ctx->flags & NGX_HTTP_V2_END_STREAM_FLAG) { + ctx->end_stream = 1; + } + + if (ctx->flags & NGX_HTTP_V2_PADDED_FLAG) { + state = sw_padding_length; + + } else if (ctx->flags & NGX_HTTP_V2_PRIORITY_FLAG) { + state = sw_dependency; + + } else { + state = sw_fragment; + } + + } else if (ctx->type == NGX_HTTP_V2_CONTINUATION_FRAME) { + state = sw_fragment; + } + + ctx->padding = 0; + ctx->frame_state = state; + } + + if (state < sw_fragment) { + + if (b->last - b->pos < (ssize_t) ctx->rest) { + last = b->last; + + } else { + last = b->pos + ctx->rest; + } + + for (p = b->pos; p < last; p++) { + ch = *p; + +#if 0 + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header byte: %02Xd s:%d", ch, state); +#endif + + /* + * headers frame: + * + * +---------------+ + * |Pad Length? (8)| + * +-+-------------+----------------------------------------------+ + * |E| Stream Dependency? (31) | + * +-+-------------+----------------------------------------------+ + * | Weight? (8) | + * +-+-------------+----------------------------------------------+ + * | Header Block Fragment (*) ... + * +--------------------------------------------------------------+ + * | Padding (*) ... + * +--------------------------------------------------------------+ + */ + + switch (state) { + + case sw_padding_length: + + ctx->padding = ch; + + if (ctx->flags & NGX_HTTP_V2_PRIORITY_FLAG) { + state = sw_dependency; + break; + } + + goto fragment; + + case sw_dependency: + state = sw_dependency_2; + break; + + case sw_dependency_2: + state = sw_dependency_3; + break; + + case sw_dependency_3: + state = sw_dependency_4; + break; + + case sw_dependency_4: + state = sw_weight; + break; + + case sw_weight: + goto fragment; + + /* suppress warning */ + case sw_start: + case sw_fragment: + case sw_padding: + break; + } + } + + ctx->rest -= p - b->pos; + b->pos = p; + + ctx->frame_state = state; + return NGX_AGAIN; + + fragment: + + p++; + ctx->rest -= p - b->pos; + b->pos = p; + + if (ctx->padding > ctx->rest) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent http2 frame with too long " + "padding: %d in frame %uz", + ctx->padding, ctx->rest); + return NGX_ERROR; + } + + state = sw_fragment; + ctx->frame_state = state; + } + + if (state == sw_fragment) { + + rc = ngx_http_grpc_parse_fragment(r, ctx, b); + + if (rc == NGX_AGAIN) { + return NGX_AGAIN; + } + + if (rc == NGX_ERROR) { + return NGX_ERROR; + } + + if (rc == NGX_OK) { + return NGX_OK; + } + + /* rc == NGX_DONE */ + + state = sw_padding; + ctx->frame_state = state; + } + + if (state == sw_padding) { + + if (b->last - b->pos < (ssize_t) ctx->rest) { + + ctx->rest -= b->last - b->pos; + b->pos = b->last; + + return NGX_AGAIN; + } + + b->pos += ctx->rest; + ctx->rest = 0; + + ctx->state = ngx_http_grpc_st_start; + + if (ctx->flags & NGX_HTTP_V2_END_HEADERS_FLAG) { + + if (ctx->fragment_state) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent truncated http2 header"); + return NGX_ERROR; + } + + ctx->parsing_headers = 0; + + return NGX_HTTP_PARSE_HEADER_DONE; + } + + return NGX_AGAIN; + } + + /* unreachable */ + + return NGX_ERROR; +} + + +static ngx_int_t +ngx_http_grpc_parse_fragment(ngx_http_request_t *r, ngx_http_grpc_ctx_t *ctx, + ngx_buf_t *b) +{ + u_char ch, *p, *last; + size_t size; + ngx_uint_t index, size_update; + enum { + sw_start = 0, + sw_index, + sw_name_length, + sw_name_length_2, + sw_name_length_3, + sw_name_length_4, + sw_name, + sw_name_bytes, + sw_value_length, + sw_value_length_2, + sw_value_length_3, + sw_value_length_4, + sw_value, + sw_value_bytes + } state; + + /* header block fragment */ + +#if 0 + ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header fragment %p:%p rest:%uz", + b->pos, b->last, ctx->rest); +#endif + + if (b->last - b->pos < (ssize_t) ctx->rest - ctx->padding) { + last = b->last; + + } else { + last = b->pos + ctx->rest - ctx->padding; + } + + state = ctx->fragment_state; + + for (p = b->pos; p < last; p++) { + ch = *p; + +#if 0 + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header byte: %02Xd s:%d", ch, state); +#endif + + switch (state) { + + case sw_start: + ctx->index = 0; + + if ((ch & 0x80) == 0x80) { + /* + * indexed header: + * + * 0 1 2 3 4 5 6 7 + * +---+---+---+---+---+---+---+---+ + * | 1 | Index (7+) | + * +---+---------------------------+ + */ + + index = ch & ~0x80; + + if (index == 0 || index > 61) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid http2 " + "table index: %ui", index); + return NGX_ERROR; + } + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc indexed header: %ui", index); + + ctx->index = index; + ctx->literal = 0; + + goto done; + + } else if ((ch & 0xc0) == 0x40) { + /* + * literal header with incremental indexing: + * + * 0 1 2 3 4 5 6 7 + * +---+---+---+---+---+---+---+---+ + * | 0 | 1 | Index (6+) | + * +---+---+-----------------------+ + * | H | Value Length (7+) | + * +---+---------------------------+ + * | Value String (Length octets) | + * +-------------------------------+ + * + * 0 1 2 3 4 5 6 7 + * +---+---+---+---+---+---+---+---+ + * | 0 | 1 | 0 | + * +---+---+-----------------------+ + * | H | Name Length (7+) | + * +---+---------------------------+ + * | Name String (Length octets) | + * +---+---------------------------+ + * | H | Value Length (7+) | + * +---+---------------------------+ + * | Value String (Length octets) | + * +-------------------------------+ + */ + + index = ch & ~0xc0; + + if (index > 61) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid http2 " + "table index: %ui", index); + return NGX_ERROR; + } + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc literal header: %ui", index); + + if (index == 0) { + state = sw_name_length; + break; + } + + ctx->index = index; + ctx->literal = 1; + + state = sw_value_length; + break; + + } else if ((ch & 0xe0) == 0x20) { + /* + * dynamic table size update: + * + * 0 1 2 3 4 5 6 7 + * +---+---+---+---+---+---+---+---+ + * | 0 | 0 | 1 | Max size (5+) | + * +---+---------------------------+ + */ + + size_update = ch & ~0xe0; + + if (size_update > 0) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid http2 " + "dynamic table size update: %ui", + size_update); + return NGX_ERROR; + } + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc table size update: %ui", size_update); + + break; + + } else if ((ch & 0xf0) == 0x10) { + /* + * literal header field never indexed: + * + * 0 1 2 3 4 5 6 7 + * +---+---+---+---+---+---+---+---+ + * | 0 | 0 | 0 | 1 | Index (4+) | + * +---+---+-----------------------+ + * | H | Value Length (7+) | + * +---+---------------------------+ + * | Value String (Length octets) | + * +-------------------------------+ + * + * 0 1 2 3 4 5 6 7 + * +---+---+---+---+---+---+---+---+ + * | 0 | 0 | 0 | 1 | 0 | + * +---+---+-----------------------+ + * | H | Name Length (7+) | + * +---+---------------------------+ + * | Name String (Length octets) | + * +---+---------------------------+ + * | H | Value Length (7+) | + * +---+---------------------------+ + * | Value String (Length octets) | + * +-------------------------------+ + */ + + index = ch & ~0xf0; + + if (index == 0x0f) { + ctx->index = index; + ctx->literal = 1; + state = sw_index; + break; + } + + if (index == 0) { + state = sw_name_length; + break; + } + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc literal header never indexed: %ui", + index); + + ctx->index = index; + ctx->literal = 1; + + state = sw_value_length; + break; + + } else if ((ch & 0xf0) == 0x00) { + /* + * literal header field without indexing: + * + * 0 1 2 3 4 5 6 7 + * +---+---+---+---+---+---+---+---+ + * | 0 | 0 | 0 | 0 | Index (4+) | + * +---+---+-----------------------+ + * | H | Value Length (7+) | + * +---+---------------------------+ + * | Value String (Length octets) | + * +-------------------------------+ + * + * 0 1 2 3 4 5 6 7 + * +---+---+---+---+---+---+---+---+ + * | 0 | 0 | 0 | 0 | 0 | + * +---+---+-----------------------+ + * | H | Name Length (7+) | + * +---+---------------------------+ + * | Name String (Length octets) | + * +---+---------------------------+ + * | H | Value Length (7+) | + * +---+---------------------------+ + * | Value String (Length octets) | + * +-------------------------------+ + */ + + index = ch & ~0xf0; + + if (index == 0x0f) { + ctx->index = index; + ctx->literal = 1; + state = sw_index; + break; + } + + if (index == 0) { + state = sw_name_length; + break; + } + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc literal header without indexing: %ui", + index); + + ctx->index = index; + ctx->literal = 1; + + state = sw_value_length; + break; + } + + /* not reached */ + + return NGX_ERROR; + + case sw_index: + ctx->index = ctx->index + (ch & ~0x80); + + if (ch & 0x80) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent http2 table index " + "with continuation flag"); + return NGX_ERROR; + } + + if (ctx->index > 61) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid http2 " + "table index: %ui", ctx->index); + return NGX_ERROR; + } + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc header index: %ui", ctx->index); + + state = sw_value_length; + break; + + case sw_name_length: + ctx->field_huffman = ch & 0x80 ? 1 : 0; + ctx->field_length = ch & ~0x80; + + if (ctx->field_length == 0x7f) { + state = sw_name_length_2; + break; + } + + if (ctx->field_length == 0) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent zero http2 " + "header name length"); + return NGX_ERROR; + } + + state = sw_name; + break; + + case sw_name_length_2: + ctx->field_length += ch & ~0x80; + + if (ch & 0x80) { + state = sw_name_length_3; + break; + } + + state = sw_name; + break; + + case sw_name_length_3: + ctx->field_length += (ch & ~0x80) << 7; + + if (ch & 0x80) { + state = sw_name_length_4; + break; + } + + state = sw_name; + break; + + case sw_name_length_4: + ctx->field_length += (ch & ~0x80) << 14; + + if (ch & 0x80) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent too large http2 " + "header name length"); + return NGX_ERROR; + } + + state = sw_name; + break; + + case sw_name: + ctx->name.len = ctx->field_huffman ? + ctx->field_length * 8 / 5 : ctx->field_length; + + ctx->name.data = ngx_pnalloc(r->pool, ctx->name.len + 1); + if (ctx->name.data == NULL) { + return NGX_ERROR; + } + + ctx->field_end = ctx->name.data; + ctx->field_rest = ctx->field_length; + ctx->field_state = 0; + + state = sw_name_bytes; + + /* fall through */ + + case sw_name_bytes: + + ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc name: len:%uz h:%d last:%uz, rest:%uz", + ctx->field_length, + ctx->field_huffman, + last - p, + ctx->rest - (p - b->pos)); + + size = ngx_min(last - p, (ssize_t) ctx->field_rest); + ctx->field_rest -= size; + + if (ctx->field_huffman) { + if (ngx_http_v2_huff_decode(&ctx->field_state, p, size, + &ctx->field_end, + ctx->field_rest == 0, + r->connection->log) + != NGX_OK) + { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid encoded header"); + return NGX_ERROR; + } + + ctx->name.len = ctx->field_end - ctx->name.data; + ctx->name.data[ctx->name.len] = '\0'; + + } else { + ctx->field_end = ngx_cpymem(ctx->field_end, p, size); + ctx->name.data[ctx->name.len] = '\0'; + } + + p += size - 1; + + if (ctx->field_rest == 0) { + state = sw_value_length; + } + + break; + + case sw_value_length: + ctx->field_huffman = ch & 0x80 ? 1 : 0; + ctx->field_length = ch & ~0x80; + + if (ctx->field_length == 0x7f) { + state = sw_value_length_2; + break; + } + + if (ctx->field_length == 0) { + ngx_str_set(&ctx->value, ""); + goto done; + } + + state = sw_value; + break; + + case sw_value_length_2: + ctx->field_length += ch & ~0x80; + + if (ch & 0x80) { + state = sw_value_length_3; + break; + } + + state = sw_value; + break; + + case sw_value_length_3: + ctx->field_length += (ch & ~0x80) << 7; + + if (ch & 0x80) { + state = sw_value_length_4; + break; + } + + state = sw_value; + break; + + case sw_value_length_4: + ctx->field_length += (ch & ~0x80) << 14; + + if (ch & 0x80) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent too large http2 " + "header value length"); + return NGX_ERROR; + } + + state = sw_value; + break; + + case sw_value: + ctx->value.len = ctx->field_huffman ? + ctx->field_length * 8 / 5 : ctx->field_length; + + ctx->value.data = ngx_pnalloc(r->pool, ctx->value.len + 1); + if (ctx->value.data == NULL) { + return NGX_ERROR; + } + + ctx->field_end = ctx->value.data; + ctx->field_rest = ctx->field_length; + ctx->field_state = 0; + + state = sw_value_bytes; + + /* fall through */ + + case sw_value_bytes: + + ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc value: len:%uz h:%d last:%uz, rest:%uz", + ctx->field_length, + ctx->field_huffman, + last - p, + ctx->rest - (p - b->pos)); + + size = ngx_min(last - p, (ssize_t) ctx->field_rest); + ctx->field_rest -= size; + + if (ctx->field_huffman) { + if (ngx_http_v2_huff_decode(&ctx->field_state, p, size, + &ctx->field_end, + ctx->field_rest == 0, + r->connection->log) + != NGX_OK) + { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid encoded header"); + return NGX_ERROR; + } + + ctx->value.len = ctx->field_end - ctx->value.data; + ctx->value.data[ctx->value.len] = '\0'; + + } else { + ctx->field_end = ngx_cpymem(ctx->field_end, p, size); + ctx->value.data[ctx->value.len] = '\0'; + } + + p += size - 1; + + if (ctx->field_rest == 0) { + goto done; + } + + break; + } + + continue; + + done: + + p++; + ctx->rest -= p - b->pos; + ctx->fragment_state = sw_start; + b->pos = p; + + if (ctx->index) { + ctx->name = *ngx_http_v2_get_static_name(ctx->index); + } + + if (ctx->index && !ctx->literal) { + ctx->value = *ngx_http_v2_get_static_value(ctx->index); + } + + if (!ctx->index) { + if (ngx_http_grpc_validate_header_name(r, &ctx->name) != NGX_OK) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid header: \"%V: %V\"", + &ctx->name, &ctx->value); + return NGX_ERROR; + } + } + + if (!ctx->index || ctx->literal) { + if (ngx_http_grpc_validate_header_value(r, &ctx->value) != NGX_OK) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent invalid header: \"%V: %V\"", + &ctx->name, &ctx->value); + return NGX_ERROR; + } + } + + return NGX_OK; + } + + ctx->rest -= p - b->pos; + ctx->fragment_state = state; + b->pos = p; + + if (ctx->rest > ctx->padding) { + return NGX_AGAIN; + } + + return NGX_DONE; +} + + +static ngx_int_t +ngx_http_grpc_validate_header_name(ngx_http_request_t *r, ngx_str_t *s) +{ + u_char ch; + ngx_uint_t i; + + for (i = 0; i < s->len; i++) { + ch = s->data[i]; + + if (ch == ':' && i > 0) { + return NGX_ERROR; + } + + if (ch >= 'A' && ch <= 'Z') { + return NGX_ERROR; + } + + if (ch == '\0' || ch == CR || ch == LF) { + return NGX_ERROR; + } + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_grpc_validate_header_value(ngx_http_request_t *r, ngx_str_t *s) +{ + u_char ch; + ngx_uint_t i; + + for (i = 0; i < s->len; i++) { + ch = s->data[i]; + + if (ch == '\0' || ch == CR || ch == LF) { + return NGX_ERROR; + } + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_grpc_parse_rst_stream(ngx_http_request_t *r, ngx_http_grpc_ctx_t *ctx, + ngx_buf_t *b) +{ + u_char ch, *p, *last; + enum { + sw_start = 0, + sw_error_2, + sw_error_3, + sw_error_4 + } state; + + if (b->last - b->pos < (ssize_t) ctx->rest) { + last = b->last; + + } else { + last = b->pos + ctx->rest; + } + + state = ctx->frame_state; + + if (state == sw_start) { + if (ctx->rest != 4) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent rst stream frame " + "with invalid length: %uz", + ctx->rest); + return NGX_ERROR; + } + } + + for (p = b->pos; p < last; p++) { + ch = *p; + +#if 0 + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc rst byte: %02Xd s:%d", ch, state); +#endif + + switch (state) { + + case sw_start: + ctx->error = (ngx_uint_t) ch << 24; + state = sw_error_2; + break; + + case sw_error_2: + ctx->error |= ch << 16; + state = sw_error_3; + break; + + case sw_error_3: + ctx->error |= ch << 8; + state = sw_error_4; + break; + + case sw_error_4: + ctx->error |= ch; + state = sw_start; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc error: %ui", ctx->error); + + break; + } + } + + ctx->rest -= p - b->pos; + ctx->frame_state = state; + b->pos = p; + + if (ctx->rest > 0) { + return NGX_AGAIN; + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_grpc_parse_goaway(ngx_http_request_t *r, ngx_http_grpc_ctx_t *ctx, + ngx_buf_t *b) +{ + u_char ch, *p, *last; + enum { + sw_start = 0, + sw_last_stream_id_2, + sw_last_stream_id_3, + sw_last_stream_id_4, + sw_error, + sw_error_2, + sw_error_3, + sw_error_4, + sw_debug + } state; + + if (b->last - b->pos < (ssize_t) ctx->rest) { + last = b->last; + + } else { + last = b->pos + ctx->rest; + } + + state = ctx->frame_state; + + if (state == sw_start) { + + if (ctx->stream_id) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent goaway frame " + "with non-zero stream id: %ui", + ctx->stream_id); + return NGX_ERROR; + } + + if (ctx->rest < 8) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent goaway frame " + "with invalid length: %uz", + ctx->rest); + return NGX_ERROR; + } + } + + for (p = b->pos; p < last; p++) { + ch = *p; + +#if 0 + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc goaway byte: %02Xd s:%d", ch, state); +#endif + + switch (state) { + + case sw_start: + ctx->stream_id = (ch & 0x7f) << 24; + state = sw_last_stream_id_2; + break; + + case sw_last_stream_id_2: + ctx->stream_id |= ch << 16; + state = sw_last_stream_id_3; + break; + + case sw_last_stream_id_3: + ctx->stream_id |= ch << 8; + state = sw_last_stream_id_4; + break; + + case sw_last_stream_id_4: + ctx->stream_id |= ch; + state = sw_error; + break; + + case sw_error: + ctx->error = (ngx_uint_t) ch << 24; + state = sw_error_2; + break; + + case sw_error_2: + ctx->error |= ch << 16; + state = sw_error_3; + break; + + case sw_error_3: + ctx->error |= ch << 8; + state = sw_error_4; + break; + + case sw_error_4: + ctx->error |= ch; + state = sw_debug; + break; + + case sw_debug: + break; + } + } + + ctx->rest -= p - b->pos; + ctx->frame_state = state; + b->pos = p; + + if (ctx->rest > 0) { + return NGX_AGAIN; + } + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc goaway: %ui, stream %ui", + ctx->error, ctx->stream_id); + + ctx->state = ngx_http_grpc_st_start; + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_grpc_parse_window_update(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx, ngx_buf_t *b) +{ + u_char ch, *p, *last; + enum { + sw_start = 0, + sw_size_2, + sw_size_3, + sw_size_4 + } state; + + if (b->last - b->pos < (ssize_t) ctx->rest) { + last = b->last; + + } else { + last = b->pos + ctx->rest; + } + + state = ctx->frame_state; + + if (state == sw_start) { + if (ctx->rest != 4) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent window update frame " + "with invalid length: %uz", + ctx->rest); + return NGX_ERROR; + } + } + + for (p = b->pos; p < last; p++) { + ch = *p; + +#if 0 + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc window update byte: %02Xd s:%d", ch, state); +#endif + + switch (state) { + + case sw_start: + ctx->window_update = (ch & 0x7f) << 24; + state = sw_size_2; + break; + + case sw_size_2: + ctx->window_update |= ch << 16; + state = sw_size_3; + break; + + case sw_size_3: + ctx->window_update |= ch << 8; + state = sw_size_4; + break; + + case sw_size_4: + ctx->window_update |= ch; + state = sw_start; + break; + } + } + + ctx->rest -= p - b->pos; + ctx->frame_state = state; + b->pos = p; + + if (ctx->rest > 0) { + return NGX_AGAIN; + } + + ctx->state = ngx_http_grpc_st_start; + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc window update: %ui", ctx->window_update); + + if (ctx->stream_id) { + + if (ctx->window_update > (size_t) NGX_HTTP_V2_MAX_WINDOW + - ctx->send_window) + { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent too large window update"); + return NGX_ERROR; + } + + ctx->send_window += ctx->window_update; + + } else { + + if (ctx->window_update > NGX_HTTP_V2_MAX_WINDOW + - ctx->connection->send_window) + { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent too large window update"); + return NGX_ERROR; + } + + ctx->connection->send_window += ctx->window_update; + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_grpc_parse_settings(ngx_http_request_t *r, ngx_http_grpc_ctx_t *ctx, + ngx_buf_t *b) +{ + u_char ch, *p, *last; + ssize_t window_update; + enum { + sw_start = 0, + sw_id, + sw_id_2, + sw_value, + sw_value_2, + sw_value_3, + sw_value_4 + } state; + + if (b->last - b->pos < (ssize_t) ctx->rest) { + last = b->last; + + } else { + last = b->pos + ctx->rest; + } + + state = ctx->frame_state; + + if (state == sw_start) { + + if (ctx->stream_id) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent settings frame " + "with non-zero stream id: %ui", + ctx->stream_id); + return NGX_ERROR; + } + + if (ctx->flags & NGX_HTTP_V2_ACK_FLAG) { + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc settings ack"); + + if (ctx->rest != 0) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent settings frame " + "with ack flag and non-zero length: %uz", + ctx->rest); + return NGX_ERROR; + } + + ctx->state = ngx_http_grpc_st_start; + + return NGX_OK; + } + + if (ctx->rest % 6 != 0) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent settings frame " + "with invalid length: %uz", + ctx->rest); + return NGX_ERROR; + } + + if (ctx->free == NULL && ctx->settings++ > 1000) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent too many settings frames"); + return NGX_ERROR; + } + } + + for (p = b->pos; p < last; p++) { + ch = *p; + +#if 0 + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc settings byte: %02Xd s:%d", ch, state); +#endif + + switch (state) { + + case sw_start: + case sw_id: + ctx->setting_id = ch << 8; + state = sw_id_2; + break; + + case sw_id_2: + ctx->setting_id |= ch; + state = sw_value; + break; + + case sw_value: + ctx->setting_value = (ngx_uint_t) ch << 24; + state = sw_value_2; + break; + + case sw_value_2: + ctx->setting_value |= ch << 16; + state = sw_value_3; + break; + + case sw_value_3: + ctx->setting_value |= ch << 8; + state = sw_value_4; + break; + + case sw_value_4: + ctx->setting_value |= ch; + state = sw_id; + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc setting: %ui %ui", + ctx->setting_id, ctx->setting_value); + + /* + * The following settings are defined by the protocol: + * + * SETTINGS_HEADER_TABLE_SIZE, SETTINGS_ENABLE_PUSH, + * SETTINGS_MAX_CONCURRENT_STREAMS, SETTINGS_INITIAL_WINDOW_SIZE, + * SETTINGS_MAX_FRAME_SIZE, SETTINGS_MAX_HEADER_LIST_SIZE + * + * Only SETTINGS_INITIAL_WINDOW_SIZE seems to be needed in + * a simple client. + */ + + if (ctx->setting_id == 0x04) { + /* SETTINGS_INITIAL_WINDOW_SIZE */ + + if (ctx->setting_value > NGX_HTTP_V2_MAX_WINDOW) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent settings frame " + "with too large initial window size: %ui", + ctx->setting_value); + return NGX_ERROR; + } + + window_update = ctx->setting_value + - ctx->connection->init_window; + ctx->connection->init_window = ctx->setting_value; + + if (ctx->send_window > 0 + && window_update > (ssize_t) NGX_HTTP_V2_MAX_WINDOW + - ctx->send_window) + { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent settings frame " + "with too large initial window size: %ui", + ctx->setting_value); + return NGX_ERROR; + } + + ctx->send_window += window_update; + } + + break; + } + } + + ctx->rest -= p - b->pos; + ctx->frame_state = state; + b->pos = p; + + if (ctx->rest > 0) { + return NGX_AGAIN; + } + + ctx->state = ngx_http_grpc_st_start; + + return ngx_http_grpc_send_settings_ack(r, ctx); +} + + +static ngx_int_t +ngx_http_grpc_parse_ping(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx, ngx_buf_t *b) +{ + u_char ch, *p, *last; + enum { + sw_start = 0, + sw_data_2, + sw_data_3, + sw_data_4, + sw_data_5, + sw_data_6, + sw_data_7, + sw_data_8 + } state; + + if (b->last - b->pos < (ssize_t) ctx->rest) { + last = b->last; + + } else { + last = b->pos + ctx->rest; + } + + state = ctx->frame_state; + + if (state == sw_start) { + + if (ctx->stream_id) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent ping frame " + "with non-zero stream id: %ui", + ctx->stream_id); + return NGX_ERROR; + } + + if (ctx->rest != 8) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent ping frame " + "with invalid length: %uz", + ctx->rest); + return NGX_ERROR; + } + + if (ctx->flags & NGX_HTTP_V2_ACK_FLAG) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent ping frame with ack flag"); + return NGX_ERROR; + } + + if (ctx->free == NULL && ctx->pings++ > 1000) { + ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, + "upstream sent too many ping frames"); + return NGX_ERROR; + } + } + + for (p = b->pos; p < last; p++) { + ch = *p; + +#if 0 + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc ping byte: %02Xd s:%d", ch, state); +#endif + + if (state < sw_data_8) { + ctx->ping_data[state] = ch; + state++; + + } else { + ctx->ping_data[7] = ch; + state = sw_start; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc ping"); + } + } + + ctx->rest -= p - b->pos; + ctx->frame_state = state; + b->pos = p; + + if (ctx->rest > 0) { + return NGX_AGAIN; + } + + ctx->state = ngx_http_grpc_st_start; + + return ngx_http_grpc_send_ping_ack(r, ctx); +} + + +static ngx_int_t +ngx_http_grpc_send_settings_ack(ngx_http_request_t *r, ngx_http_grpc_ctx_t *ctx) +{ + ngx_chain_t *cl, **ll; + ngx_http_grpc_frame_t *f; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc send settings ack"); + + for (cl = ctx->out, ll = &ctx->out; cl; cl = cl->next) { + ll = &cl->next; + } + + cl = ngx_http_grpc_get_buf(r, ctx); + if (cl == NULL) { + return NGX_ERROR; + } + + f = (ngx_http_grpc_frame_t *) cl->buf->last; + cl->buf->last += sizeof(ngx_http_grpc_frame_t); + + f->length_0 = 0; + f->length_1 = 0; + f->length_2 = 0; + f->type = NGX_HTTP_V2_SETTINGS_FRAME; + f->flags = NGX_HTTP_V2_ACK_FLAG; + f->stream_id_0 = 0; + f->stream_id_1 = 0; + f->stream_id_2 = 0; + f->stream_id_3 = 0; + + *ll = cl; + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_grpc_send_ping_ack(ngx_http_request_t *r, ngx_http_grpc_ctx_t *ctx) +{ + ngx_chain_t *cl, **ll; + ngx_http_grpc_frame_t *f; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc send ping ack"); + + for (cl = ctx->out, ll = &ctx->out; cl; cl = cl->next) { + ll = &cl->next; + } + + cl = ngx_http_grpc_get_buf(r, ctx); + if (cl == NULL) { + return NGX_ERROR; + } + + f = (ngx_http_grpc_frame_t *) cl->buf->last; + cl->buf->last += sizeof(ngx_http_grpc_frame_t); + + f->length_0 = 0; + f->length_1 = 0; + f->length_2 = 8; + f->type = NGX_HTTP_V2_PING_FRAME; + f->flags = NGX_HTTP_V2_ACK_FLAG; + f->stream_id_0 = 0; + f->stream_id_1 = 0; + f->stream_id_2 = 0; + f->stream_id_3 = 0; + + cl->buf->last = ngx_copy(cl->buf->last, ctx->ping_data, 8); + + *ll = cl; + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_grpc_send_window_update(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx) +{ + size_t n; + ngx_chain_t *cl, **ll; + ngx_http_grpc_frame_t *f; + + ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "grpc send window update: %uz %uz", + ctx->connection->recv_window, ctx->recv_window); + + for (cl = ctx->out, ll = &ctx->out; cl; cl = cl->next) { + ll = &cl->next; + } + + cl = ngx_http_grpc_get_buf(r, ctx); + if (cl == NULL) { + return NGX_ERROR; + } + + f = (ngx_http_grpc_frame_t *) cl->buf->last; + cl->buf->last += sizeof(ngx_http_grpc_frame_t); + + f->length_0 = 0; + f->length_1 = 0; + f->length_2 = 4; + f->type = NGX_HTTP_V2_WINDOW_UPDATE_FRAME; + f->flags = 0; + f->stream_id_0 = 0; + f->stream_id_1 = 0; + f->stream_id_2 = 0; + f->stream_id_3 = 0; + + n = NGX_HTTP_V2_MAX_WINDOW - ctx->connection->recv_window; + ctx->connection->recv_window = NGX_HTTP_V2_MAX_WINDOW; + + *cl->buf->last++ = (u_char) ((n >> 24) & 0xff); + *cl->buf->last++ = (u_char) ((n >> 16) & 0xff); + *cl->buf->last++ = (u_char) ((n >> 8) & 0xff); + *cl->buf->last++ = (u_char) (n & 0xff); + + f = (ngx_http_grpc_frame_t *) cl->buf->last; + cl->buf->last += sizeof(ngx_http_grpc_frame_t); + + f->length_0 = 0; + f->length_1 = 0; + f->length_2 = 4; + f->type = NGX_HTTP_V2_WINDOW_UPDATE_FRAME; + f->flags = 0; + f->stream_id_0 = (u_char) ((ctx->id >> 24) & 0xff); + f->stream_id_1 = (u_char) ((ctx->id >> 16) & 0xff); + f->stream_id_2 = (u_char) ((ctx->id >> 8) & 0xff); + f->stream_id_3 = (u_char) (ctx->id & 0xff); + + n = NGX_HTTP_V2_MAX_WINDOW - ctx->recv_window; + ctx->recv_window = NGX_HTTP_V2_MAX_WINDOW; + + *cl->buf->last++ = (u_char) ((n >> 24) & 0xff); + *cl->buf->last++ = (u_char) ((n >> 16) & 0xff); + *cl->buf->last++ = (u_char) ((n >> 8) & 0xff); + *cl->buf->last++ = (u_char) (n & 0xff); + + *ll = cl; + + return NGX_OK; +} + + +static ngx_chain_t * +ngx_http_grpc_get_buf(ngx_http_request_t *r, ngx_http_grpc_ctx_t *ctx) +{ + u_char *start; + ngx_buf_t *b; + ngx_chain_t *cl; + + cl = ngx_chain_get_free_buf(r->pool, &ctx->free); + if (cl == NULL) { + return NULL; + } + + b = cl->buf; + start = b->start; + + if (start == NULL) { + + /* + * each buffer is large enough to hold two window update + * frames in a row + */ + + start = ngx_palloc(r->pool, 2 * sizeof(ngx_http_grpc_frame_t) + 8); + if (start == NULL) { + return NULL; + } + + } + + ngx_memzero(b, sizeof(ngx_buf_t)); + + b->start = start; + b->pos = start; + b->last = start; + b->end = start + 2 * sizeof(ngx_http_grpc_frame_t) + 8; + + b->tag = (ngx_buf_tag_t) &ngx_http_grpc_body_output_filter; + b->temporary = 1; + b->flush = 1; + + return cl; +} + + +static ngx_http_grpc_ctx_t * +ngx_http_grpc_get_ctx(ngx_http_request_t *r) +{ + ngx_http_grpc_ctx_t *ctx; + ngx_http_upstream_t *u; + + ctx = ngx_http_get_module_ctx(r, ngx_http_grpc_module); + + if (ctx->connection == NULL) { + u = r->upstream; + + if (ngx_http_grpc_get_connection_data(r, ctx, &u->peer) != NGX_OK) { + return NULL; + } + } + + return ctx; +} + + +static ngx_int_t +ngx_http_grpc_get_connection_data(ngx_http_request_t *r, + ngx_http_grpc_ctx_t *ctx, ngx_peer_connection_t *pc) +{ + ngx_connection_t *c; + ngx_pool_cleanup_t *cln; + + c = pc->connection; + + if (pc->cached) { + + /* + * for cached connections, connection data can be found + * in the cleanup handler + */ + + for (cln = c->pool->cleanup; cln; cln = cln->next) { + if (cln->handler == ngx_http_grpc_cleanup) { + ctx->connection = cln->data; + break; + } + } + + if (ctx->connection == NULL) { + ngx_log_error(NGX_LOG_ERR, c->log, 0, + "no connection data found for " + "keepalive http2 connection"); + return NGX_ERROR; + } + + ctx->send_window = ctx->connection->init_window; + ctx->recv_window = NGX_HTTP_V2_MAX_WINDOW; + + ctx->connection->last_stream_id += 2; + ctx->id = ctx->connection->last_stream_id; + + return NGX_OK; + } + + cln = ngx_pool_cleanup_add(c->pool, sizeof(ngx_http_grpc_conn_t)); + if (cln == NULL) { + return NGX_ERROR; + } + + cln->handler = ngx_http_grpc_cleanup; + ctx->connection = cln->data; + + ctx->connection->init_window = NGX_HTTP_V2_DEFAULT_WINDOW; + ctx->connection->send_window = NGX_HTTP_V2_DEFAULT_WINDOW; + ctx->connection->recv_window = NGX_HTTP_V2_MAX_WINDOW; + + ctx->send_window = NGX_HTTP_V2_DEFAULT_WINDOW; + ctx->recv_window = NGX_HTTP_V2_MAX_WINDOW; + + ctx->id = 1; + ctx->connection->last_stream_id = 1; + + return NGX_OK; +} + + +static void +ngx_http_grpc_cleanup(void *data) +{ +#if 0 + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, + "grpc cleanup"); +#endif + return; +} + + +static void +ngx_http_grpc_abort_request(ngx_http_request_t *r) +{ + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "abort grpc request"); + return; +} + + +static void +ngx_http_grpc_finalize_request(ngx_http_request_t *r, ngx_int_t rc) +{ + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "finalize grpc request"); + return; +} + + +static ngx_int_t +ngx_http_grpc_internal_trailers_variable(ngx_http_request_t *r, + ngx_http_variable_value_t *v, uintptr_t data) +{ + ngx_table_elt_t *te; + + te = r->headers_in.te; + + if (te == NULL) { + v->not_found = 1; + return NGX_OK; + } + + if (ngx_strlcasestrn(te->value.data, te->value.data + te->value.len, + (u_char *) "trailers", 8 - 1) + == NULL) + { + v->not_found = 1; + return NGX_OK; + } + + v->valid = 1; + v->no_cacheable = 0; + v->not_found = 0; + + v->data = (u_char *) "trailers"; + v->len = sizeof("trailers") - 1; + + return NGX_OK; +} + + +static ngx_int_t +ngx_http_grpc_add_variables(ngx_conf_t *cf) +{ + ngx_http_variable_t *var, *v; + + for (v = ngx_http_grpc_vars; v->name.len; v++) { + var = ngx_http_add_variable(cf, &v->name, v->flags); + if (var == NULL) { + return NGX_ERROR; + } + + var->get_handler = v->get_handler; + var->data = v->data; + } + + return NGX_OK; +} + + +static void * +ngx_http_grpc_create_loc_conf(ngx_conf_t *cf) +{ + ngx_http_grpc_loc_conf_t *conf; + + conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_grpc_loc_conf_t)); + if (conf == NULL) { + return NULL; + } + + /* + * set by ngx_pcalloc(): + * + * conf->upstream.ignore_headers = 0; + * conf->upstream.next_upstream = 0; + * conf->upstream.hide_headers_hash = { NULL, 0 }; + * conf->upstream.ssl_name = NULL; + * + * conf->headers_source = NULL; + * conf->headers.lengths = NULL; + * conf->headers.values = NULL; + * conf->headers.hash = { NULL, 0 }; + * conf->host = { 0, NULL }; + * conf->host_set = 0; + * conf->ssl = 0; + * conf->ssl_protocols = 0; + * conf->ssl_ciphers = { 0, NULL }; + * conf->ssl_trusted_certificate = { 0, NULL }; + * conf->ssl_crl = { 0, NULL }; + * conf->ssl_certificate = { 0, NULL }; + * conf->ssl_certificate_key = { 0, NULL }; + */ + + conf->upstream.local = NGX_CONF_UNSET_PTR; + conf->upstream.next_upstream_tries = NGX_CONF_UNSET_UINT; + conf->upstream.connect_timeout = NGX_CONF_UNSET_MSEC; + conf->upstream.send_timeout = NGX_CONF_UNSET_MSEC; + conf->upstream.read_timeout = NGX_CONF_UNSET_MSEC; + conf->upstream.next_upstream_timeout = NGX_CONF_UNSET_MSEC; + + conf->upstream.buffer_size = NGX_CONF_UNSET_SIZE; + + conf->upstream.hide_headers = NGX_CONF_UNSET_PTR; + conf->upstream.pass_headers = NGX_CONF_UNSET_PTR; + + conf->upstream.intercept_errors = NGX_CONF_UNSET; + +#if (NGX_HTTP_SSL) + conf->upstream.ssl_session_reuse = NGX_CONF_UNSET; + conf->upstream.ssl_server_name = NGX_CONF_UNSET; + conf->upstream.ssl_verify = NGX_CONF_UNSET; + conf->ssl_verify_depth = NGX_CONF_UNSET_UINT; + conf->ssl_passwords = NGX_CONF_UNSET_PTR; +#endif + + /* the hardcoded values */ + conf->upstream.cyclic_temp_file = 0; + conf->upstream.buffering = 0; + conf->upstream.ignore_client_abort = 0; + conf->upstream.send_lowat = 0; + conf->upstream.bufs.num = 0; + conf->upstream.busy_buffers_size = 0; + conf->upstream.max_temp_file_size = 0; + conf->upstream.temp_file_write_size = 0; + conf->upstream.pass_request_headers = 1; + conf->upstream.pass_request_body = 1; + conf->upstream.force_ranges = 0; + conf->upstream.pass_trailers = 1; + conf->upstream.preserve_output = 1; + + ngx_str_set(&conf->upstream.module, "grpc"); + + return conf; +} + + +static char * +ngx_http_grpc_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) +{ + ngx_http_grpc_loc_conf_t *prev = parent; + ngx_http_grpc_loc_conf_t *conf = child; + + ngx_int_t rc; + ngx_hash_init_t hash; + ngx_http_core_loc_conf_t *clcf; + + ngx_conf_merge_ptr_value(conf->upstream.local, + prev->upstream.local, NULL); + + ngx_conf_merge_uint_value(conf->upstream.next_upstream_tries, + prev->upstream.next_upstream_tries, 0); + + ngx_conf_merge_msec_value(conf->upstream.connect_timeout, + prev->upstream.connect_timeout, 60000); + + ngx_conf_merge_msec_value(conf->upstream.send_timeout, + prev->upstream.send_timeout, 60000); + + ngx_conf_merge_msec_value(conf->upstream.read_timeout, + prev->upstream.read_timeout, 60000); + + ngx_conf_merge_msec_value(conf->upstream.next_upstream_timeout, + prev->upstream.next_upstream_timeout, 0); + + ngx_conf_merge_size_value(conf->upstream.buffer_size, + prev->upstream.buffer_size, + (size_t) ngx_pagesize); + + ngx_conf_merge_bitmask_value(conf->upstream.ignore_headers, + prev->upstream.ignore_headers, + NGX_CONF_BITMASK_SET); + + ngx_conf_merge_bitmask_value(conf->upstream.next_upstream, + prev->upstream.next_upstream, + (NGX_CONF_BITMASK_SET + |NGX_HTTP_UPSTREAM_FT_ERROR + |NGX_HTTP_UPSTREAM_FT_TIMEOUT)); + + if (conf->upstream.next_upstream & NGX_HTTP_UPSTREAM_FT_OFF) { + conf->upstream.next_upstream = NGX_CONF_BITMASK_SET + |NGX_HTTP_UPSTREAM_FT_OFF; + } + + ngx_conf_merge_value(conf->upstream.intercept_errors, + prev->upstream.intercept_errors, 0); + +#if (NGX_HTTP_SSL) + + ngx_conf_merge_value(conf->upstream.ssl_session_reuse, + prev->upstream.ssl_session_reuse, 1); + + ngx_conf_merge_bitmask_value(conf->ssl_protocols, prev->ssl_protocols, + (NGX_CONF_BITMASK_SET|NGX_SSL_TLSv1 + |NGX_SSL_TLSv1_1|NGX_SSL_TLSv1_2)); + + ngx_conf_merge_str_value(conf->ssl_ciphers, prev->ssl_ciphers, + "DEFAULT"); + + if (conf->upstream.ssl_name == NULL) { + conf->upstream.ssl_name = prev->upstream.ssl_name; + } + + ngx_conf_merge_value(conf->upstream.ssl_server_name, + prev->upstream.ssl_server_name, 0); + ngx_conf_merge_value(conf->upstream.ssl_verify, + prev->upstream.ssl_verify, 0); + ngx_conf_merge_uint_value(conf->ssl_verify_depth, + prev->ssl_verify_depth, 1); + ngx_conf_merge_str_value(conf->ssl_trusted_certificate, + prev->ssl_trusted_certificate, ""); + ngx_conf_merge_str_value(conf->ssl_crl, prev->ssl_crl, ""); + + ngx_conf_merge_str_value(conf->ssl_certificate, + prev->ssl_certificate, ""); + ngx_conf_merge_str_value(conf->ssl_certificate_key, + prev->ssl_certificate_key, ""); + ngx_conf_merge_ptr_value(conf->ssl_passwords, prev->ssl_passwords, NULL); + + if (conf->ssl && ngx_http_grpc_set_ssl(cf, conf) != NGX_OK) { + return NGX_CONF_ERROR; + } + +#endif + + hash.max_size = 512; + hash.bucket_size = ngx_align(64, ngx_cacheline_size); + hash.name = "grpc_headers_hash"; + + if (ngx_http_upstream_hide_headers_hash(cf, &conf->upstream, + &prev->upstream, ngx_http_grpc_hide_headers, &hash) + != NGX_OK) + { + return NGX_CONF_ERROR; + } + + clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); + + if (clcf->noname && conf->upstream.upstream == NULL) { + conf->upstream.upstream = prev->upstream.upstream; + conf->host = prev->host; +#if (NGX_HTTP_SSL) + conf->upstream.ssl = prev->upstream.ssl; +#endif + } + + if (clcf->lmt_excpt && clcf->handler == NULL && conf->upstream.upstream) { + clcf->handler = ngx_http_grpc_handler; + } + + if (conf->headers_source == NULL) { + conf->headers = prev->headers; + conf->headers_source = prev->headers_source; + conf->host_set = prev->host_set; + } + + rc = ngx_http_grpc_init_headers(cf, conf, &conf->headers, + ngx_http_grpc_headers); + if (rc != NGX_OK) { + return NGX_CONF_ERROR; + } + + /* + * special handling to preserve conf->headers in the "http" section + * to inherit it to all servers + */ + + if (prev->headers.hash.buckets == NULL + && conf->headers_source == prev->headers_source) + { + prev->headers = conf->headers; + prev->host_set = conf->host_set; + } + + return NGX_CONF_OK; +} + + +static ngx_int_t +ngx_http_grpc_init_headers(ngx_conf_t *cf, ngx_http_grpc_loc_conf_t *conf, + ngx_http_grpc_headers_t *headers, ngx_keyval_t *default_headers) +{ + u_char *p; + size_t size; + uintptr_t *code; + ngx_uint_t i; + ngx_array_t headers_names, headers_merged; + ngx_keyval_t *src, *s, *h; + ngx_hash_key_t *hk; + ngx_hash_init_t hash; + ngx_http_script_compile_t sc; + ngx_http_script_copy_code_t *copy; + + if (headers->hash.buckets) { + return NGX_OK; + } + + if (ngx_array_init(&headers_names, cf->temp_pool, 4, sizeof(ngx_hash_key_t)) + != NGX_OK) + { + return NGX_ERROR; + } + + if (ngx_array_init(&headers_merged, cf->temp_pool, 4, sizeof(ngx_keyval_t)) + != NGX_OK) + { + return NGX_ERROR; + } + + headers->lengths = ngx_array_create(cf->pool, 64, 1); + if (headers->lengths == NULL) { + return NGX_ERROR; + } + + headers->values = ngx_array_create(cf->pool, 512, 1); + if (headers->values == NULL) { + return NGX_ERROR; + } + + if (conf->headers_source) { + + src = conf->headers_source->elts; + for (i = 0; i < conf->headers_source->nelts; i++) { + + if (src[i].key.len == 4 + && ngx_strncasecmp(src[i].key.data, (u_char *) "Host", 4) == 0) + { + conf->host_set = 1; + } + + s = ngx_array_push(&headers_merged); + if (s == NULL) { + return NGX_ERROR; + } + + *s = src[i]; + } + } + + h = default_headers; + + while (h->key.len) { + + src = headers_merged.elts; + for (i = 0; i < headers_merged.nelts; i++) { + if (ngx_strcasecmp(h->key.data, src[i].key.data) == 0) { + goto next; + } + } + + s = ngx_array_push(&headers_merged); + if (s == NULL) { + return NGX_ERROR; + } + + *s = *h; + + next: + + h++; + } + + + src = headers_merged.elts; + for (i = 0; i < headers_merged.nelts; i++) { + + hk = ngx_array_push(&headers_names); + if (hk == NULL) { + return NGX_ERROR; + } + + hk->key = src[i].key; + hk->key_hash = ngx_hash_key_lc(src[i].key.data, src[i].key.len); + hk->value = (void *) 1; + + if (src[i].value.len == 0) { + continue; + } + + copy = ngx_array_push_n(headers->lengths, + sizeof(ngx_http_script_copy_code_t)); + if (copy == NULL) { + return NGX_ERROR; + } + + copy->code = (ngx_http_script_code_pt) (void *) + ngx_http_script_copy_len_code; + copy->len = src[i].key.len; + + size = (sizeof(ngx_http_script_copy_code_t) + + src[i].key.len + sizeof(uintptr_t) - 1) + & ~(sizeof(uintptr_t) - 1); + + copy = ngx_array_push_n(headers->values, size); + if (copy == NULL) { + return NGX_ERROR; + } + + copy->code = ngx_http_script_copy_code; + copy->len = src[i].key.len; + + p = (u_char *) copy + sizeof(ngx_http_script_copy_code_t); + ngx_memcpy(p, src[i].key.data, src[i].key.len); + + ngx_memzero(&sc, sizeof(ngx_http_script_compile_t)); + + sc.cf = cf; + sc.source = &src[i].value; + sc.flushes = &headers->flushes; + sc.lengths = &headers->lengths; + sc.values = &headers->values; + + if (ngx_http_script_compile(&sc) != NGX_OK) { + return NGX_ERROR; + } + + code = ngx_array_push_n(headers->lengths, sizeof(uintptr_t)); + if (code == NULL) { + return NGX_ERROR; + } + + *code = (uintptr_t) NULL; + + code = ngx_array_push_n(headers->values, sizeof(uintptr_t)); + if (code == NULL) { + return NGX_ERROR; + } + + *code = (uintptr_t) NULL; + } + + code = ngx_array_push_n(headers->lengths, sizeof(uintptr_t)); + if (code == NULL) { + return NGX_ERROR; + } + + *code = (uintptr_t) NULL; + + + hash.hash = &headers->hash; + hash.key = ngx_hash_key_lc; + hash.max_size = 512; + hash.bucket_size = 64; + hash.name = "grpc_headers_hash"; + hash.pool = cf->pool; + hash.temp_pool = NULL; + + return ngx_hash_init(&hash, headers_names.elts, headers_names.nelts); +} + + +static char * +ngx_http_grpc_pass(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) +{ + ngx_http_grpc_loc_conf_t *glcf = conf; + + size_t add; + ngx_str_t *value, *url; + ngx_url_t u; + ngx_http_core_loc_conf_t *clcf; + + if (glcf->upstream.upstream) { + return "is duplicate"; + } + + value = cf->args->elts; + url = &value[1]; + + if (ngx_strncasecmp(url->data, (u_char *) "grpc://", 7) == 0) { + add = 7; + + } else if (ngx_strncasecmp(url->data, (u_char *) "grpcs://", 8) == 0) { + +#if (NGX_HTTP_SSL) + glcf->ssl = 1; + + add = 8; +#else + ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, + "grpcs protocol requires SSL support"); + return NGX_CONF_ERROR; +#endif + + } else { + add = 0; + } + + ngx_memzero(&u, sizeof(ngx_url_t)); + + u.url.len = url->len - add; + u.url.data = url->data + add; + u.no_resolve = 1; + + glcf->upstream.upstream = ngx_http_upstream_add(cf, &u, 0); + if (glcf->upstream.upstream == NULL) { + return NGX_CONF_ERROR; + } + + if (u.family != AF_UNIX) { + + if (u.no_port) { + glcf->host = u.host; + + } else { + glcf->host.len = u.host.len + 1 + u.port_text.len; + glcf->host.data = u.host.data; + } + + } else { + ngx_str_set(&glcf->host, "localhost"); + } + + clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); + + clcf->handler = ngx_http_grpc_handler; + + if (clcf->name.data[clcf->name.len - 1] == '/') { + clcf->auto_redirect = 1; + } + + return NGX_CONF_OK; +} + + +#if (NGX_HTTP_SSL) + +static char * +ngx_http_grpc_ssl_password_file(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) +{ + ngx_http_grpc_loc_conf_t *glcf = conf; + + ngx_str_t *value; + + if (glcf->ssl_passwords != NGX_CONF_UNSET_PTR) { + return "is duplicate"; + } + + value = cf->args->elts; + + glcf->ssl_passwords = ngx_ssl_read_password_file(cf, &value[1]); + + if (glcf->ssl_passwords == NULL) { + return NGX_CONF_ERROR; + } + + return NGX_CONF_OK; +} + + +static ngx_int_t +ngx_http_grpc_set_ssl(ngx_conf_t *cf, ngx_http_grpc_loc_conf_t *glcf) +{ + ngx_pool_cleanup_t *cln; + + glcf->upstream.ssl = ngx_pcalloc(cf->pool, sizeof(ngx_ssl_t)); + if (glcf->upstream.ssl == NULL) { + return NGX_ERROR; + } + + glcf->upstream.ssl->log = cf->log; + + if (ngx_ssl_create(glcf->upstream.ssl, glcf->ssl_protocols, NULL) + != NGX_OK) + { + return NGX_ERROR; + } + + cln = ngx_pool_cleanup_add(cf->pool, 0); + if (cln == NULL) { + return NGX_ERROR; + } + + cln->handler = ngx_ssl_cleanup_ctx; + cln->data = glcf->upstream.ssl; + + if (glcf->ssl_certificate.len) { + + if (glcf->ssl_certificate_key.len == 0) { + ngx_log_error(NGX_LOG_EMERG, cf->log, 0, + "no \"grpc_ssl_certificate_key\" is defined " + "for certificate \"%V\"", &glcf->ssl_certificate); + return NGX_ERROR; + } + + if (ngx_ssl_certificate(cf, glcf->upstream.ssl, &glcf->ssl_certificate, + &glcf->ssl_certificate_key, glcf->ssl_passwords) + != NGX_OK) + { + return NGX_ERROR; + } + } + + if (ngx_ssl_ciphers(cf, glcf->upstream.ssl, &glcf->ssl_ciphers, 0) + != NGX_OK) + { + return NGX_ERROR; + } + + if (glcf->upstream.ssl_verify) { + if (glcf->ssl_trusted_certificate.len == 0) { + ngx_log_error(NGX_LOG_EMERG, cf->log, 0, + "no grpc_ssl_trusted_certificate for grpc_ssl_verify"); + return NGX_ERROR; + } + + if (ngx_ssl_trusted_certificate(cf, glcf->upstream.ssl, + &glcf->ssl_trusted_certificate, + glcf->ssl_verify_depth) + != NGX_OK) + { + return NGX_ERROR; + } + + if (ngx_ssl_crl(cf, glcf->upstream.ssl, &glcf->ssl_crl) != NGX_OK) { + return NGX_ERROR; + } + } + +#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation + + if (SSL_CTX_set_alpn_protos(glcf->upstream.ssl->ctx, + (u_char *) "\x02h2", 3) + != 0) + { + ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0, + "SSL_CTX_set_alpn_protos() failed"); + return NGX_ERROR; + } + +#endif + + return NGX_OK; +} + +#endif |