Mercurial > hg > nginx-quic
view src/http/v3/ngx_http_v3_request.c @ 8691:925572184d4a quic
HTTP/3: adjusted QUIC connection finalization.
When an HTTP/3 function returns an error in context of a QUIC stream, it's
this function's responsibility now to finalize the entire QUIC connection
with the right code, if required. Previously, QUIC connection finalization
could be done both outside and inside such functions. The new rule follows
a similar rule for logging, leads to cleaner code, and allows to provide more
details about the error.
While here, a few error cases are no longer treated as fatal and QUIC connection
is no longer finalized in these cases. A few other cases now lead to
stream reset instead of connection finalization.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Mon, 18 Oct 2021 15:22:33 +0300 |
parents | 72b304f6207c |
children | 0d3bf08eaac0 |
line wrap: on
line source
/* * Copyright (C) Roman Arutyunyan * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> static void ngx_http_v3_cleanup_request(void *data); static void ngx_http_v3_process_request(ngx_event_t *rev); static ngx_int_t ngx_http_v3_process_header(ngx_http_request_t *r, ngx_str_t *name, ngx_str_t *value); static ngx_int_t ngx_http_v3_validate_header(ngx_http_request_t *r, ngx_str_t *name, ngx_str_t *value); static ngx_int_t ngx_http_v3_process_pseudo_header(ngx_http_request_t *r, ngx_str_t *name, ngx_str_t *value); static ngx_int_t ngx_http_v3_init_pseudo_headers(ngx_http_request_t *r); static ngx_int_t ngx_http_v3_process_request_header(ngx_http_request_t *r); static void ngx_http_v3_read_client_request_body_handler(ngx_http_request_t *r); static ngx_int_t ngx_http_v3_do_read_client_request_body(ngx_http_request_t *r); static ngx_int_t ngx_http_v3_request_body_filter(ngx_http_request_t *r, ngx_chain_t *in); static const struct { ngx_str_t name; ngx_uint_t method; } ngx_http_v3_methods[] = { { ngx_string("GET"), NGX_HTTP_GET }, { ngx_string("POST"), NGX_HTTP_POST }, { ngx_string("HEAD"), NGX_HTTP_HEAD }, { ngx_string("OPTIONS"), NGX_HTTP_OPTIONS }, { ngx_string("PROPFIND"), NGX_HTTP_PROPFIND }, { ngx_string("PUT"), NGX_HTTP_PUT }, { ngx_string("MKCOL"), NGX_HTTP_MKCOL }, { ngx_string("DELETE"), NGX_HTTP_DELETE }, { ngx_string("COPY"), NGX_HTTP_COPY }, { ngx_string("MOVE"), NGX_HTTP_MOVE }, { ngx_string("PROPPATCH"), NGX_HTTP_PROPPATCH }, { ngx_string("LOCK"), NGX_HTTP_LOCK }, { ngx_string("UNLOCK"), NGX_HTTP_UNLOCK }, { ngx_string("PATCH"), NGX_HTTP_PATCH }, { ngx_string("TRACE"), NGX_HTTP_TRACE }, { ngx_string("CONNECT"), NGX_HTTP_CONNECT } }; void ngx_http_v3_init(ngx_connection_t *c) { size_t size; uint64_t n; ngx_buf_t *b; ngx_event_t *rev; ngx_pool_cleanup_t *cln; ngx_http_request_t *r; ngx_http_connection_t *hc; ngx_http_v3_session_t *h3c; ngx_http_core_loc_conf_t *clcf; ngx_http_core_srv_conf_t *cscf; if (ngx_http_v3_init_session(c) != NGX_OK) { ngx_http_close_connection(c); return; } if (c->quic->id & NGX_QUIC_STREAM_UNIDIRECTIONAL) { ngx_http_v3_init_uni_stream(c); return; } ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 init request stream"); #if (NGX_STAT_STUB) (void) ngx_atomic_fetch_add(ngx_stat_active, 1); #endif hc = c->data; clcf = ngx_http_get_module_loc_conf(hc->conf_ctx, ngx_http_core_module); n = c->quic->id >> 2; if (n >= clcf->keepalive_requests * 2) { ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_EXCESSIVE_LOAD, "too many requests per connection"); ngx_http_close_connection(c); return; } h3c = ngx_http_v3_get_session(c); if (h3c->goaway) { ngx_quic_reset_stream(c, NGX_HTTP_V3_ERR_REQUEST_REJECTED); ngx_http_close_connection(c); return; } if (n + 1 == clcf->keepalive_requests || ngx_current_msec - c->quic->parent->start_time > clcf->keepalive_time) { h3c->goaway = 1; if (ngx_http_v3_send_goaway(c, (n + 1) << 2) != NGX_OK) { ngx_http_close_connection(c); return; } ngx_http_v3_shutdown_connection(c, NGX_HTTP_V3_ERR_NO_ERROR, "reached maximum number of requests"); } cln = ngx_pool_cleanup_add(c->pool, 0); if (cln == NULL) { ngx_http_close_connection(c); return; } cln->handler = ngx_http_v3_cleanup_request; cln->data = c; h3c->nrequests++; if (h3c->keepalive.timer_set) { ngx_del_timer(&h3c->keepalive); } cscf = ngx_http_get_module_srv_conf(hc->conf_ctx, ngx_http_core_module); size = cscf->client_header_buffer_size; b = c->buffer; if (b == NULL) { b = ngx_create_temp_buf(c->pool, size); if (b == NULL) { ngx_http_close_connection(c); return; } c->buffer = b; } else if (b->start == NULL) { b->start = ngx_palloc(c->pool, size); if (b->start == NULL) { ngx_http_close_connection(c); return; } b->pos = b->start; b->last = b->start; b->end = b->last + size; } c->log->action = "reading client request"; r = ngx_http_create_request(c); if (r == NULL) { ngx_http_close_connection(c); return; } r->http_version = NGX_HTTP_VERSION_30; r->v3_parse = ngx_pcalloc(r->pool, sizeof(ngx_http_v3_parse_t)); if (r->v3_parse == NULL) { ngx_http_close_connection(c); return; } r->v3_parse->header_limit = cscf->large_client_header_buffers.size * cscf->large_client_header_buffers.num; c->data = r; c->requests = n + 1; rev = c->read; rev->handler = ngx_http_v3_process_request; ngx_http_v3_process_request(rev); } static void ngx_http_v3_cleanup_request(void *data) { ngx_connection_t *c = data; ngx_http_v3_session_t *h3c; ngx_http_core_loc_conf_t *clcf; h3c = ngx_http_v3_get_session(c); if (--h3c->nrequests == 0) { clcf = ngx_http_v3_get_module_loc_conf(c, ngx_http_core_module); ngx_add_timer(&h3c->keepalive, clcf->keepalive_timeout); } } static void ngx_http_v3_process_request(ngx_event_t *rev) { u_char *p; ssize_t n; ngx_buf_t *b; ngx_int_t rc; ngx_connection_t *c; ngx_http_request_t *r; ngx_http_v3_session_t *h3c; ngx_http_core_srv_conf_t *cscf; ngx_http_v3_parse_headers_t *st; c = rev->data; r = c->data; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0, "http3 process request"); if (rev->timedout) { ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); c->timedout = 1; ngx_http_close_request(r, NGX_HTTP_REQUEST_TIME_OUT); return; } h3c = ngx_http_v3_get_session(c); st = &r->v3_parse->headers; b = r->header_in; for ( ;; ) { if (b->pos == b->last) { if (rev->ready) { n = c->recv(c, b->start, b->end - b->start); } else { n = NGX_AGAIN; } if (n == NGX_AGAIN) { if (!rev->timer_set) { cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module); ngx_add_timer(rev, cscf->client_header_timeout); } if (ngx_handle_read_event(rev, 0) != NGX_OK) { ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); } break; } if (n == 0) { ngx_log_error(NGX_LOG_INFO, c->log, 0, "client prematurely closed connection"); } if (n == 0 || n == NGX_ERROR) { c->error = 1; c->log->action = "reading client request"; ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST); break; } b->pos = b->start; b->last = b->start + n; } p = b->pos; rc = ngx_http_v3_parse_headers(c, st, b); if (rc > 0) { ngx_quic_reset_stream(c, rc); ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "client sent invalid header"); ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST); break; } if (rc == NGX_ERROR) { ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); break; } r->request_length += b->pos - p; h3c->total_bytes += b->pos - p; if (ngx_http_v3_check_flood(c) != NGX_OK) { ngx_http_close_request(r, NGX_HTTP_CLOSE); break; } if (rc == NGX_BUSY) { if (rev->error) { ngx_http_close_request(r, NGX_HTTP_CLOSE); break; } if (ngx_handle_read_event(rev, 0) != NGX_OK) { ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); } break; } if (rc == NGX_AGAIN) { continue; } /* rc == NGX_OK || rc == NGX_DONE */ h3c->payload_bytes += ngx_http_v3_encode_field_l(NULL, &st->field_rep.field.name, &st->field_rep.field.value); if (ngx_http_v3_process_header(r, &st->field_rep.field.name, &st->field_rep.field.value) != NGX_OK) { break; } if (rc == NGX_DONE) { if (ngx_http_v3_process_request_header(r) != NGX_OK) { break; } ngx_http_process_request(r); break; } } ngx_http_run_posted_requests(c); return; } static ngx_int_t ngx_http_v3_process_header(ngx_http_request_t *r, ngx_str_t *name, ngx_str_t *value) { size_t len; ngx_table_elt_t *h; ngx_http_header_t *hh; ngx_http_core_srv_conf_t *cscf; ngx_http_core_main_conf_t *cmcf; len = name->len + value->len; if (len > r->v3_parse->header_limit) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent too large header"); ngx_http_finalize_request(r, NGX_HTTP_REQUEST_HEADER_TOO_LARGE); return NGX_ERROR; } r->v3_parse->header_limit -= len; if (ngx_http_v3_validate_header(r, name, value) != NGX_OK) { ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST); return NGX_ERROR; } if (r->invalid_header) { cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module); if (cscf->ignore_invalid_headers) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent invalid header: \"%V\"", name); return NGX_OK; } } if (name->len && name->data[0] == ':') { return ngx_http_v3_process_pseudo_header(r, name, value); } if (ngx_http_v3_init_pseudo_headers(r) != NGX_OK) { return NGX_ERROR; } h = ngx_list_push(&r->headers_in.headers); if (h == NULL) { ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); return NGX_ERROR; } h->key = *name; h->value = *value; h->lowcase_key = h->key.data; h->hash = ngx_hash_key(h->key.data, h->key.len); cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module); hh = ngx_hash_find(&cmcf->headers_in_hash, h->hash, h->lowcase_key, h->key.len); if (hh && hh->handler(r, h, hh->offset) != NGX_OK) { return NGX_ERROR; } ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http3 header: \"%V: %V\"", name, value); return NGX_OK; } static ngx_int_t ngx_http_v3_validate_header(ngx_http_request_t *r, ngx_str_t *name, ngx_str_t *value) { u_char ch; ngx_uint_t i; ngx_http_core_srv_conf_t *cscf; r->invalid_header = 0; cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module); for (i = (name->data[0] == ':'); i != name->len; i++) { ch = name->data[i]; if ((ch >= 'a' && ch <= 'z') || (ch == '-') || (ch >= '0' && ch <= '9') || (ch == '_' && cscf->underscores_in_headers)) { continue; } if (ch <= 0x20 || ch == 0x7f || ch == ':' || (ch >= 'A' && ch <= 'Z')) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent invalid header name: \"%V\"", name); return NGX_ERROR; } r->invalid_header = 1; } for (i = 0; i != value->len; i++) { ch = value->data[i]; if (ch == '\0' || ch == LF || ch == CR) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent header \"%V\" with " "invalid value: \"%V\"", name, value); return NGX_ERROR; } } return NGX_OK; } static ngx_int_t ngx_http_v3_process_pseudo_header(ngx_http_request_t *r, ngx_str_t *name, ngx_str_t *value) { u_char ch, c; ngx_uint_t i; if (r->request_line.len) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent out of order pseudo-headers"); goto failed; } if (name->len == 7 && ngx_strncmp(name->data, ":method", 7) == 0) { if (r->method_name.len) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent duplicate \":method\" header"); goto failed; } if (value->len == 0) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent empty \":method\" header"); goto failed; } r->method_name = *value; for (i = 0; i < sizeof(ngx_http_v3_methods) / sizeof(ngx_http_v3_methods[0]); i++) { if (value->len == ngx_http_v3_methods[i].name.len && ngx_strncmp(value->data, ngx_http_v3_methods[i].name.data, value->len) == 0) { r->method = ngx_http_v3_methods[i].method; break; } } for (i = 0; i < value->len; i++) { ch = value->data[i]; if ((ch < 'A' || ch > 'Z') && ch != '_' && ch != '-') { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent invalid method: \"%V\"", value); goto failed; } } ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http3 method \"%V\" %ui", value, r->method); return NGX_OK; } if (name->len == 5 && ngx_strncmp(name->data, ":path", 5) == 0) { if (r->uri_start) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent duplicate \":path\" header"); goto failed; } if (value->len == 0) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent empty \":path\" header"); goto failed; } r->uri_start = value->data; r->uri_end = value->data + value->len; if (ngx_http_parse_uri(r) != NGX_OK) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent invalid \":path\" header: \"%V\"", value); goto failed; } ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http3 path \"%V\"", value); return NGX_OK; } if (name->len == 7 && ngx_strncmp(name->data, ":scheme", 7) == 0) { if (r->schema.len) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent duplicate \":scheme\" header"); goto failed; } if (value->len == 0) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent empty \":scheme\" header"); goto failed; } for (i = 0; i < value->len; i++) { ch = value->data[i]; c = (u_char) (ch | 0x20); if (c >= 'a' && c <= 'z') { continue; } if (((ch >= '0' && ch <= '9') || ch == '+' || ch == '-' || ch == '.') && i > 0) { continue; } ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent invalid \":scheme\" header: \"%V\"", value); goto failed; } r->schema = *value; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http3 schema \"%V\"", value); return NGX_OK; } if (name->len == 10 && ngx_strncmp(name->data, ":authority", 10) == 0) { if (r->host_start) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent duplicate \":authority\" header"); goto failed; } r->host_start = value->data; r->host_end = value->data + value->len; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http3 authority \"%V\"", value); return NGX_OK; } ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent unknown pseudo-header \"%V\"", name); failed: ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST); return NGX_ERROR; } static ngx_int_t ngx_http_v3_init_pseudo_headers(ngx_http_request_t *r) { size_t len; u_char *p; ngx_int_t rc; ngx_str_t host; if (r->request_line.len) { return NGX_OK; } if (r->method_name.len == 0) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent no \":method\" header"); goto failed; } if (r->schema.len == 0) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent no \":scheme\" header"); goto failed; } if (r->uri_start == NULL) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent no \":path\" header"); goto failed; } len = r->method_name.len + 1 + (r->uri_end - r->uri_start) + 1 + sizeof("HTTP/3.0") - 1; p = ngx_pnalloc(r->pool, len); if (p == NULL) { ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); return NGX_ERROR; } r->request_line.data = p; p = ngx_cpymem(p, r->method_name.data, r->method_name.len); *p++ = ' '; p = ngx_cpymem(p, r->uri_start, r->uri_end - r->uri_start); *p++ = ' '; p = ngx_cpymem(p, "HTTP/3.0", sizeof("HTTP/3.0") - 1); r->request_line.len = p - r->request_line.data; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http3 request line: \"%V\"", &r->request_line); ngx_str_set(&r->http_protocol, "HTTP/3.0"); if (ngx_http_process_request_uri(r) != NGX_OK) { return NGX_ERROR; } if (r->host_end) { host.len = r->host_end - r->host_start; host.data = r->host_start; rc = ngx_http_validate_host(&host, r->pool, 0); if (rc == NGX_DECLINED) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent invalid host in request line"); goto failed; } if (rc == NGX_ERROR) { ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); return NGX_ERROR; } if (ngx_http_set_virtual_server(r, &host) == NGX_ERROR) { return NGX_ERROR; } r->headers_in.server = host; } if (ngx_list_init(&r->headers_in.headers, r->pool, 20, sizeof(ngx_table_elt_t)) != NGX_OK) { ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); return NGX_ERROR; } return NGX_OK; failed: ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST); return NGX_ERROR; } static ngx_int_t ngx_http_v3_process_request_header(ngx_http_request_t *r) { ssize_t n; ngx_buf_t *b; ngx_connection_t *c; c = r->connection; if (ngx_http_v3_init_pseudo_headers(r) != NGX_OK) { return NGX_ERROR; } if (r->headers_in.server.len == 0) { ngx_log_error(NGX_LOG_INFO, c->log, 0, "client sent neither \":authority\" nor \"Host\" header"); goto failed; } if (r->headers_in.host) { if (r->headers_in.host->value.len != r->headers_in.server.len || ngx_memcmp(r->headers_in.host->value.data, r->headers_in.server.data, r->headers_in.server.len) != 0) { ngx_log_error(NGX_LOG_INFO, c->log, 0, "client sent \":authority\" and \"Host\" headers " "with different values"); goto failed; } } if (r->headers_in.content_length) { r->headers_in.content_length_n = ngx_atoof(r->headers_in.content_length->value.data, r->headers_in.content_length->value.len); if (r->headers_in.content_length_n == NGX_ERROR) { ngx_log_error(NGX_LOG_INFO, c->log, 0, "client sent invalid \"Content-Length\" header"); goto failed; } } else { b = r->header_in; n = b->last - b->pos; if (n == 0) { n = c->recv(c, b->start, b->end - b->start); if (n == NGX_ERROR) { ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); return NGX_ERROR; } if (n > 0) { b->pos = b->start; b->last = b->start + n; } } if (n != 0) { r->headers_in.chunked = 1; } } if (r->method == NGX_HTTP_CONNECT) { ngx_log_error(NGX_LOG_INFO, c->log, 0, "client sent CONNECT method"); ngx_http_finalize_request(r, NGX_HTTP_NOT_ALLOWED); return NGX_ERROR; } if (r->method == NGX_HTTP_TRACE) { ngx_log_error(NGX_LOG_INFO, c->log, 0, "client sent TRACE method"); ngx_http_finalize_request(r, NGX_HTTP_NOT_ALLOWED); return NGX_ERROR; } return NGX_OK; failed: ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST); return NGX_ERROR; } ngx_int_t ngx_http_v3_read_request_body(ngx_http_request_t *r) { size_t preread; ngx_int_t rc; ngx_chain_t *cl, out; ngx_http_request_body_t *rb; ngx_http_core_loc_conf_t *clcf; rb = r->request_body; preread = r->header_in->last - r->header_in->pos; if (preread) { /* there is the pre-read part of the request body */ ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http3 client request body preread %uz", preread); out.buf = r->header_in; out.next = NULL; cl = &out; } else { cl = NULL; } rc = ngx_http_v3_request_body_filter(r, cl); if (rc != NGX_OK) { return rc; } if (rb->rest == 0 && rb->last_saved) { /* the whole request body was pre-read */ r->request_body_no_buffering = 0; rb->post_handler(r); return NGX_OK; } if (rb->rest < 0) { ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, "negative request body rest"); return NGX_HTTP_INTERNAL_SERVER_ERROR; } clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); rb->buf = ngx_create_temp_buf(r->pool, clcf->client_body_buffer_size); if (rb->buf == NULL) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } r->read_event_handler = ngx_http_v3_read_client_request_body_handler; r->write_event_handler = ngx_http_request_empty_handler; return ngx_http_v3_do_read_client_request_body(r); } static void ngx_http_v3_read_client_request_body_handler(ngx_http_request_t *r) { ngx_int_t rc; if (r->connection->read->timedout) { r->connection->timedout = 1; ngx_http_finalize_request(r, NGX_HTTP_REQUEST_TIME_OUT); return; } rc = ngx_http_v3_do_read_client_request_body(r); if (rc >= NGX_HTTP_SPECIAL_RESPONSE) { ngx_http_finalize_request(r, rc); } } ngx_int_t ngx_http_v3_read_unbuffered_request_body(ngx_http_request_t *r) { ngx_int_t rc; if (r->connection->read->timedout) { r->connection->timedout = 1; return NGX_HTTP_REQUEST_TIME_OUT; } rc = ngx_http_v3_do_read_client_request_body(r); if (rc == NGX_OK) { r->reading_body = 0; } return rc; } static ngx_int_t ngx_http_v3_do_read_client_request_body(ngx_http_request_t *r) { off_t rest; size_t size; ssize_t n; ngx_int_t rc; ngx_uint_t flush; ngx_chain_t out; ngx_connection_t *c; ngx_http_request_body_t *rb; ngx_http_core_loc_conf_t *clcf; c = r->connection; rb = r->request_body; flush = 1; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 read client request body"); for ( ;; ) { for ( ;; ) { if (rb->rest == 0) { break; } if (rb->buf->last == rb->buf->end) { /* update chains */ rc = ngx_http_v3_request_body_filter(r, NULL); if (rc != NGX_OK) { return rc; } if (rb->busy != NULL) { if (r->request_body_no_buffering) { if (c->read->timer_set) { ngx_del_timer(c->read); } if (ngx_handle_read_event(c->read, 0) != NGX_OK) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } return NGX_AGAIN; } if (rb->filter_need_buffering) { clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); ngx_add_timer(c->read, clcf->client_body_timeout); if (ngx_handle_read_event(c->read, 0) != NGX_OK) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } return NGX_AGAIN; } ngx_log_error(NGX_LOG_ALERT, c->log, 0, "busy buffers after request body flush"); return NGX_HTTP_INTERNAL_SERVER_ERROR; } flush = 0; rb->buf->pos = rb->buf->start; rb->buf->last = rb->buf->start; } size = rb->buf->end - rb->buf->last; rest = rb->rest - (rb->buf->last - rb->buf->pos); if ((off_t) size > rest) { size = (size_t) rest; } if (size == 0) { break; } n = c->recv(c, rb->buf->last, size); ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 client request body recv %z", n); if (n == NGX_AGAIN) { break; } if (n == 0) { rb->buf->last_buf = 1; } if (n == NGX_ERROR) { c->error = 1; return NGX_HTTP_BAD_REQUEST; } rb->buf->last += n; /* pass buffer to request body filter chain */ flush = 0; out.buf = rb->buf; out.next = NULL; rc = ngx_http_v3_request_body_filter(r, &out); if (rc != NGX_OK) { return rc; } if (rb->rest == 0) { break; } if (rb->buf->last < rb->buf->end) { break; } } ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 client request body rest %O", rb->rest); if (flush) { rc = ngx_http_v3_request_body_filter(r, NULL); if (rc != NGX_OK) { return rc; } } if (rb->rest == 0 && rb->last_saved) { break; } if (!c->read->ready || rb->rest == 0) { clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); ngx_add_timer(c->read, clcf->client_body_timeout); if (ngx_handle_read_event(c->read, 0) != NGX_OK) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } return NGX_AGAIN; } } if (c->read->timer_set) { ngx_del_timer(c->read); } if (!r->request_body_no_buffering) { r->read_event_handler = ngx_http_block_reading; rb->post_handler(r); } return NGX_OK; } static ngx_int_t ngx_http_v3_request_body_filter(ngx_http_request_t *r, ngx_chain_t *in) { off_t max; size_t size; u_char *p; ngx_int_t rc; ngx_buf_t *b; ngx_uint_t last; ngx_chain_t *cl, *out, *tl, **ll; ngx_http_v3_session_t *h3c; ngx_http_request_body_t *rb; ngx_http_core_loc_conf_t *clcf; ngx_http_core_srv_conf_t *cscf; ngx_http_v3_parse_data_t *st; rb = r->request_body; st = &r->v3_parse->body; h3c = ngx_http_v3_get_session(r->connection); if (rb->rest == -1) { ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http3 request body filter"); cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module); rb->rest = cscf->large_client_header_buffers.size; } clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); max = r->headers_in.content_length_n; if (max == -1 && clcf->client_max_body_size) { max = clcf->client_max_body_size; } out = NULL; ll = &out; last = 0; for (cl = in; cl; cl = cl->next) { ngx_log_debug7(NGX_LOG_DEBUG_EVENT, r->connection->log, 0, "http3 body buf " "t:%d f:%d %p, pos %p, size: %z file: %O, size: %O", cl->buf->temporary, 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); if (cl->buf->last_buf) { last = 1; } b = NULL; while (cl->buf->pos < cl->buf->last) { if (st->length == 0) { p = cl->buf->pos; rc = ngx_http_v3_parse_data(r->connection, st, cl->buf); r->request_length += cl->buf->pos - p; h3c->total_bytes += cl->buf->pos - p; if (ngx_http_v3_check_flood(r->connection) != NGX_OK) { return NGX_HTTP_CLOSE; } if (rc == NGX_AGAIN) { continue; } if (rc == NGX_DONE) { last = 1; goto done; } if (rc > 0) { ngx_quic_reset_stream(r->connection, rc); ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "client sent invalid body"); return NGX_HTTP_BAD_REQUEST; } if (rc == NGX_ERROR) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } /* rc == NGX_OK */ } if (max != -1 && (uint64_t) (max - rb->received) < st->length) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "client intended to send too large " "body: %O+%ui bytes", rb->received, st->length); return NGX_HTTP_REQUEST_ENTITY_TOO_LARGE; } if (b && st->length <= 128 && (uint64_t) (cl->buf->last - cl->buf->pos) >= st->length) { rb->received += st->length; r->request_length += st->length; h3c->total_bytes += st->length; h3c->payload_bytes += st->length; if (st->length < 8) { while (st->length) { *b->last++ = *cl->buf->pos++; st->length--; } } else { ngx_memmove(b->last, cl->buf->pos, st->length); b->last += st->length; cl->buf->pos += st->length; st->length = 0; } continue; } tl = ngx_chain_get_free_buf(r->pool, &rb->free); if (tl == NULL) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } b = tl->buf; ngx_memzero(b, sizeof(ngx_buf_t)); b->temporary = 1; b->tag = (ngx_buf_tag_t) &ngx_http_read_client_request_body; b->start = cl->buf->pos; b->pos = cl->buf->pos; b->last = cl->buf->last; b->end = cl->buf->end; b->flush = r->request_body_no_buffering; *ll = tl; ll = &tl->next; size = cl->buf->last - cl->buf->pos; if (size > st->length) { cl->buf->pos += (size_t) st->length; rb->received += st->length; r->request_length += st->length; h3c->total_bytes += st->length; h3c->payload_bytes += st->length; st->length = 0; } else { st->length -= size; rb->received += size; r->request_length += size; h3c->total_bytes += size; h3c->payload_bytes += size; cl->buf->pos = cl->buf->last; } b->last = cl->buf->pos; } } done: if (last) { if (st->length > 0) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client prematurely closed stream"); r->connection->error = 1; return NGX_HTTP_BAD_REQUEST; } if (r->headers_in.content_length_n == -1) { r->headers_in.content_length_n = rb->received; } else if (r->headers_in.content_length_n != rb->received) { ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, "client sent less body data than expected: " "%O out of %O bytes of request body received", rb->received, r->headers_in.content_length_n); return NGX_HTTP_BAD_REQUEST; } rb->rest = 0; tl = ngx_chain_get_free_buf(r->pool, &rb->free); if (tl == NULL) { return NGX_HTTP_INTERNAL_SERVER_ERROR; } b = tl->buf; ngx_memzero(b, sizeof(ngx_buf_t)); b->last_buf = 1; *ll = tl; } else { /* set rb->rest, amount of data we want to see next time */ cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module); rb->rest = (off_t) cscf->large_client_header_buffers.size; } rc = ngx_http_top_request_body_filter(r, out); ngx_chain_update_chains(r->pool, &rb->free, &rb->busy, &out, (ngx_buf_tag_t) &ngx_http_read_client_request_body); return rc; }