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nginx/nginx/1b8267cea2d953dc26c231dbba8bfc9d290a0f0c/./src/http/ngx_http_request.c
blob: 1a774e434e38260e93c01035344d9254b7117223 [file]
/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
static void ngx_http_init_request(ngx_event_t *ev);
static void ngx_http_process_request_line(ngx_event_t *rev);
static void ngx_http_process_request_headers(ngx_event_t *rev);
static ssize_t ngx_http_read_request_header(ngx_http_request_t *r);
static ngx_int_t ngx_http_alloc_large_header_buffer(ngx_http_request_t *r,
ngx_uint_t request_line);
static ngx_int_t ngx_http_process_header_line(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_process_unique_header_line(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_process_host(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_process_connection(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_process_user_agent(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_process_cookie(ngx_http_request_t *r,
ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_process_request_header(ngx_http_request_t *r);
static void ngx_http_process_request(ngx_http_request_t *r);
static ssize_t ngx_http_validate_host(u_char *host, size_t len);
static ngx_int_t ngx_http_find_virtual_server(ngx_http_request_t *r,
u_char *host, size_t len);
static void ngx_http_request_handler(ngx_event_t *ev);
static ngx_int_t ngx_http_set_write_handler(ngx_http_request_t *r);
static void ngx_http_writer(ngx_http_request_t *r);
static void ngx_http_request_finalizer(ngx_http_request_t *r);
static void ngx_http_set_keepalive(ngx_http_request_t *r);
static void ngx_http_keepalive_handler(ngx_event_t *ev);
static void ngx_http_set_lingering_close(ngx_http_request_t *r);
static void ngx_http_lingering_close_handler(ngx_event_t *ev);
static ngx_int_t ngx_http_post_action(ngx_http_request_t *r);
static void ngx_http_close_request(ngx_http_request_t *r, ngx_int_t error);
static void ngx_http_request_done(ngx_http_request_t *r, ngx_int_t error);
static void ngx_http_log_request(ngx_http_request_t *r);
static void ngx_http_close_connection(ngx_connection_t *c);
static u_char *ngx_http_log_error(ngx_log_t *log, u_char *buf, size_t len);
static u_char *ngx_http_log_error_handler(ngx_http_request_t *r,
ngx_http_request_t *sr, u_char *buf, size_t len);
#if (NGX_HTTP_SSL)
static void ngx_http_ssl_handshake(ngx_event_t *rev);
static void ngx_http_ssl_handshake_handler(ngx_connection_t *c);
#endif
static char *ngx_http_client_errors[] = {
/* NGX_HTTP_PARSE_INVALID_METHOD */
"client sent invalid method",
/* NGX_HTTP_PARSE_INVALID_REQUEST */
"client sent invalid request",
/* NGX_HTTP_PARSE_INVALID_09_METHOD */
"client sent invalid method in HTTP/0.9 request"
};
ngx_http_header_t ngx_http_headers_in[] = {
{ ngx_string("Host"), offsetof(ngx_http_headers_in_t, host),
ngx_http_process_host },
{ ngx_string("Connection"), offsetof(ngx_http_headers_in_t, connection),
ngx_http_process_connection },
{ ngx_string("If-Modified-Since"),
offsetof(ngx_http_headers_in_t, if_modified_since),
ngx_http_process_unique_header_line },
{ ngx_string("User-Agent"), offsetof(ngx_http_headers_in_t, user_agent),
ngx_http_process_user_agent },
{ ngx_string("Referer"), offsetof(ngx_http_headers_in_t, referer),
ngx_http_process_header_line },
{ ngx_string("Content-Length"),
offsetof(ngx_http_headers_in_t, content_length),
ngx_http_process_unique_header_line },
{ ngx_string("Content-Type"),
offsetof(ngx_http_headers_in_t, content_type),
ngx_http_process_header_line },
{ ngx_string("Range"), offsetof(ngx_http_headers_in_t, range),
ngx_http_process_header_line },
{ ngx_string("If-Range"),
offsetof(ngx_http_headers_in_t, if_range),
ngx_http_process_unique_header_line },
{ ngx_string("Transfer-Encoding"),
offsetof(ngx_http_headers_in_t, transfer_encoding),
ngx_http_process_header_line },
{ ngx_string("Expect"),
offsetof(ngx_http_headers_in_t, expect),
ngx_http_process_unique_header_line },
#if (NGX_HTTP_GZIP)
{ ngx_string("Accept-Encoding"),
offsetof(ngx_http_headers_in_t, accept_encoding),
ngx_http_process_header_line },
{ ngx_string("Via"), offsetof(ngx_http_headers_in_t, via),
ngx_http_process_header_line },
#endif
{ ngx_string("Authorization"),
offsetof(ngx_http_headers_in_t, authorization),
ngx_http_process_unique_header_line },
{ ngx_string("Keep-Alive"), offsetof(ngx_http_headers_in_t, keep_alive),
ngx_http_process_header_line },
#if (NGX_HTTP_PROXY || NGX_HTTP_REALIP)
{ ngx_string("X-Forwarded-For"),
offsetof(ngx_http_headers_in_t, x_forwarded_for),
ngx_http_process_header_line },
#endif
#if (NGX_HTTP_REALIP)
{ ngx_string("X-Real-IP"),
offsetof(ngx_http_headers_in_t, x_real_ip),
ngx_http_process_header_line },
#endif
#if (NGX_HTTP_HEADERS)
{ ngx_string("Accept"), offsetof(ngx_http_headers_in_t, accept),
ngx_http_process_header_line },
{ ngx_string("Accept-Language"),
offsetof(ngx_http_headers_in_t, accept_language),
ngx_http_process_header_line },
#endif
#if (NGX_HTTP_DAV)
{ ngx_string("Depth"), offsetof(ngx_http_headers_in_t, depth),
ngx_http_process_header_line },
{ ngx_string("Destination"), offsetof(ngx_http_headers_in_t, destination),
ngx_http_process_header_line },
{ ngx_string("Overwrite"), offsetof(ngx_http_headers_in_t, overwrite),
ngx_http_process_header_line },
{ ngx_string("Date"), offsetof(ngx_http_headers_in_t, date),
ngx_http_process_header_line },
#endif
{ ngx_string("Cookie"), 0, ngx_http_process_cookie },
{ ngx_null_string, 0, NULL }
};
void
ngx_http_init_connection(ngx_connection_t *c)
{
ngx_event_t *rev;
ngx_http_log_ctx_t *ctx;
ctx = ngx_palloc(c->pool, sizeof(ngx_http_log_ctx_t));
if (ctx == NULL) {
ngx_http_close_connection(c);
return;
}
ctx->connection = c;
ctx->request = NULL;
ctx->current_request = NULL;
c->log->connection = c->number;
c->log->handler = ngx_http_log_error;
c->log->data = ctx;
c->log->action = "reading client request line";
c->log_error = NGX_ERROR_INFO;
rev = c->read;
rev->handler = ngx_http_init_request;
c->write->handler = ngx_http_empty_handler;
#if (NGX_STAT_STUB)
ngx_atomic_fetch_add(ngx_stat_reading, 1);
#endif
if (rev->ready) {
/* the deferred accept(), rtsig, aio, iocp */
if (ngx_use_accept_mutex) {
ngx_post_event(rev, &ngx_posted_events);
return;
}
ngx_http_init_request(rev);
return;
}
ngx_add_timer(rev, c->listening->post_accept_timeout);
if (ngx_handle_read_event(rev, 0) != NGX_OK) {
#if (NGX_STAT_STUB)
ngx_atomic_fetch_add(ngx_stat_reading, -1);
#endif
ngx_http_close_connection(c);
return;
}
}
static void
ngx_http_init_request(ngx_event_t *rev)
{
ngx_time_t *tp;
ngx_uint_t i;
ngx_connection_t *c;
ngx_http_request_t *r;
ngx_http_in_port_t *hip;
ngx_http_in_addr_t *hia;
ngx_http_log_ctx_t *ctx;
ngx_http_connection_t *hc;
ngx_http_core_srv_conf_t *cscf;
ngx_http_core_loc_conf_t *clcf;
ngx_http_core_main_conf_t *cmcf;
#if (NGX_STAT_STUB)
ngx_atomic_fetch_add(ngx_stat_reading, -1);
#endif
c = rev->data;
if (rev->timedout) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
ngx_http_close_connection(c);
return;
}
hc = c->data;
if (hc == NULL) {
hc = ngx_pcalloc(c->pool, sizeof(ngx_http_connection_t));
if (hc == NULL) {
ngx_http_close_connection(c);
return;
}
}
r = hc->request;
if (r) {
ngx_memzero(r, sizeof(ngx_http_request_t));
r->pipeline = hc->pipeline;
if (hc->nbusy) {
r->header_in = hc->busy[0];
}
} else {
r = ngx_pcalloc(c->pool, sizeof(ngx_http_request_t));
if (r == NULL) {
ngx_http_close_connection(c);
return;
}
hc->request = r;
}
c->data = r;
r->http_connection = hc;
c->sent = 0;
r->signature = NGX_HTTP_MODULE;
/* find the server configuration for the address:port */
/* AF_INET only */
hip = c->listening->servers;
hia = hip->addrs;
r->port = hip->port;
r->port_text = &hip->port_text;
i = 0;
r->connection = c;
if (hip->naddrs > 1) {
/*
* There are several addresses on this port and one of them
* is the "*:port" wildcard so getsockname() is needed to determine
* the server address.
*
* AcceptEx() already has given this address.
*/
#if (NGX_WIN32)
if (c->local_sockaddr) {
r->in_addr =
((struct sockaddr_in *) c->local_sockaddr)->sin_addr.s_addr;
} else
#endif
{
if (ngx_http_server_addr(r, NULL) != NGX_OK) {
ngx_http_close_connection(c);
return;
}
}
/* the last address is "*" */
for ( /* void */ ; i < hip->naddrs - 1; i++) {
if (hia[i].addr == r->in_addr) {
break;
}
}
} else {
r->in_addr = hia[0].addr;
}
r->virtual_names = hia[i].virtual_names;
/* the default server configuration for the address:port */
cscf = hia[i].core_srv_conf;
r->main_conf = cscf->ctx->main_conf;
r->srv_conf = cscf->ctx->srv_conf;
r->loc_conf = cscf->ctx->loc_conf;
rev->handler = ngx_http_process_request_line;
#if (NGX_HTTP_SSL)
{
ngx_http_ssl_srv_conf_t *sscf;
sscf = ngx_http_get_module_srv_conf(r, ngx_http_ssl_module);
if (sscf->enable || hia[i].ssl) {
if (c->ssl == NULL) {
c->log->action = "SSL handshaking";
if (hia[i].ssl && sscf->ssl.ctx == NULL) {
ngx_log_error(NGX_LOG_ERR, c->log, 0,
"no \"ssl_certificate\" is defined "
"in server listening on SSL port");
ngx_http_close_connection(c);
return;
}
if (ngx_ssl_create_connection(&sscf->ssl, c, NGX_SSL_BUFFER)
== NGX_ERROR)
{
ngx_http_close_connection(c);
return;
}
rev->handler = ngx_http_ssl_handshake;
}
r->main_filter_need_in_memory = 1;
}
}
#endif
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
c->log->file = clcf->err_log->file;
if (!(c->log->log_level & NGX_LOG_DEBUG_CONNECTION)) {
c->log->log_level = clcf->err_log->log_level;
}
if (c->buffer == NULL) {
c->buffer = ngx_create_temp_buf(c->pool,
cscf->client_header_buffer_size);
if (c->buffer == NULL) {
ngx_http_close_connection(c);
return;
}
}
if (r->header_in == NULL) {
r->header_in = c->buffer;
}
r->pool = ngx_create_pool(cscf->request_pool_size, c->log);
if (r->pool == NULL) {
ngx_http_close_connection(c);
return;
}
if (ngx_list_init(&r->headers_out.headers, r->pool, 20,
sizeof(ngx_table_elt_t))
== NGX_ERROR)
{
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
r->ctx = ngx_pcalloc(r->pool, sizeof(void *) * ngx_http_max_module);
if (r->ctx == NULL) {
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
r->variables = ngx_pcalloc(r->pool, cmcf->variables.nelts
* sizeof(ngx_http_variable_value_t));
if (r->variables == NULL) {
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
c->single_connection = 1;
c->destroyed = 0;
r->main = r;
tp = ngx_timeofday();
r->start_sec = tp->sec;
r->start_msec = tp->msec;
r->method = NGX_HTTP_UNKNOWN;
r->headers_in.content_length_n = -1;
r->headers_in.keep_alive_n = -1;
r->headers_out.content_length_n = -1;
r->headers_out.last_modified_time = -1;
r->uri_changes = NGX_HTTP_MAX_URI_CHANGES + 1;
r->subrequests = NGX_HTTP_MAX_SUBREQUESTS + 1;
r->http_state = NGX_HTTP_READING_REQUEST_STATE;
ctx = c->log->data;
ctx->request = r;
ctx->current_request = r;
r->log_handler = ngx_http_log_error_handler;
#if (NGX_STAT_STUB)
ngx_atomic_fetch_add(ngx_stat_reading, 1);
r->stat_reading = 1;
ngx_atomic_fetch_add(ngx_stat_requests, 1);
#endif
rev->handler(rev);
}
#if (NGX_HTTP_SSL)
static void
ngx_http_ssl_handshake(ngx_event_t *rev)
{
u_char buf[1];
ssize_t n;
ngx_int_t rc;
ngx_connection_t *c;
ngx_http_request_t *r;
c = rev->data;
r = c->data;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0,
"http check ssl handshake");
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;
}
n = recv(c->fd, (char *) buf, 1, MSG_PEEK);
if (n == -1 && ngx_socket_errno == NGX_EAGAIN) {
if (!rev->timer_set) {
ngx_add_timer(rev, c->listening->post_accept_timeout);
}
if (ngx_handle_read_event(rev, 0) != NGX_OK) {
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
}
return;
}
if (n == 1) {
if (buf[0] == 0x80 /* SSLv2 */ || buf[0] == 0x16 /* SSLv3/TLSv1 */) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, rev->log, 0,
"https ssl handshake: 0x%02Xd", buf[0]);
rc = ngx_ssl_handshake(c);
if (rc == NGX_AGAIN) {
if (!rev->timer_set) {
ngx_add_timer(rev, c->listening->post_accept_timeout);
}
c->ssl->handler = ngx_http_ssl_handshake_handler;
return;
}
ngx_http_ssl_handshake_handler(c);
return;
} else {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0,
"plain http");
r->plain_http = 1;
}
}
c->log->action = "reading client request line";
rev->handler = ngx_http_process_request_line;
ngx_http_process_request_line(rev);
}
static void
ngx_http_ssl_handshake_handler(ngx_connection_t *c)
{
ngx_http_request_t *r;
if (c->ssl->handshaked) {
/*
* The majority of browsers do not send the "close notify" alert.
* Among them are MSIE, old Mozilla, Netscape 4, Konqueror,
* and Links. And what is more, MSIE ignores the server's alert.
*
* Opera and recent Mozilla send the alert.
*/
c->ssl->no_wait_shutdown = 1;
c->read->handler = ngx_http_process_request_line;
/* STUB: epoll edge */ c->write->handler = ngx_http_empty_handler;
ngx_http_process_request_line(c->read);
return;
}
r = c->data;
ngx_http_close_request(r, NGX_HTTP_BAD_REQUEST);
return;
}
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
int
ngx_http_ssl_servername(ngx_ssl_conn_t *ssl_conn, int *ad, void *arg)
{
size_t len;
const char *servername;
ngx_connection_t *c;
ngx_http_request_t *r;
ngx_http_ssl_srv_conf_t *sscf;
servername = SSL_get_servername(ssl_conn, TLSEXT_NAMETYPE_host_name);
if (servername == NULL) {
return SSL_TLSEXT_ERR_NOACK;
}
c = ngx_ssl_get_connection(ssl_conn);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"SSL server name: \"%s\"", servername);
len = ngx_strlen(servername);
if (len == 0) {
return SSL_TLSEXT_ERR_NOACK;
}
r = c->data;
if (ngx_http_find_virtual_server(r, (u_char *) servername, len) != NGX_OK) {
return SSL_TLSEXT_ERR_NOACK;
}
sscf = ngx_http_get_module_srv_conf(r, ngx_http_ssl_module);
SSL_set_SSL_CTX(ssl_conn, sscf->ssl.ctx);
return SSL_TLSEXT_ERR_OK;
}
#endif
#endif
static void
ngx_http_process_request_line(ngx_event_t *rev)
{
ssize_t n;
ngx_int_t rc, rv;
ngx_connection_t *c;
ngx_http_request_t *r;
ngx_http_core_srv_conf_t *cscf;
c = rev->data;
r = c->data;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0,
"http process request line");
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;
}
rc = NGX_AGAIN;
for ( ;; ) {
if (rc == NGX_AGAIN) {
n = ngx_http_read_request_header(r);
if (n == NGX_AGAIN || n == NGX_ERROR) {
return;
}
}
rc = ngx_http_parse_request_line(r, r->header_in);
if (rc == NGX_OK) {
/* the request line has been parsed successfully */
r->request_line.len = r->request_end - r->request_start;
r->request_line.data = r->request_start;
*r->request_end = '\0';
if (r->args_start) {
r->uri.len = r->args_start - 1 - r->uri_start;
} else {
r->uri.len = r->uri_end - r->uri_start;
}
if (r->complex_uri || r->quoted_uri) {
r->uri.data = ngx_pnalloc(r->pool, r->uri.len + 1);
if (r->uri.data == NULL) {
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
rc = ngx_http_parse_complex_uri(r, cscf->merge_slashes);
if (rc == NGX_HTTP_PARSE_INVALID_REQUEST) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid request");
ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
return;
}
} else {
r->uri.data = r->uri_start;
}
r->unparsed_uri.len = r->uri_end - r->uri_start;
r->unparsed_uri.data = r->uri_start;
r->method_name.len = r->method_end - r->request_start + 1;
r->method_name.data = r->request_line.data;
if (r->http_protocol.data) {
r->http_protocol.len = r->request_end - r->http_protocol.data;
}
if (r->uri_ext) {
if (r->args_start) {
r->exten.len = r->args_start - 1 - r->uri_ext;
} else {
r->exten.len = r->uri_end - r->uri_ext;
}
r->exten.data = r->uri_ext;
}
if (r->args_start && r->uri_end > r->args_start) {
r->args.len = r->uri_end - r->args_start;
r->args.data = r->args_start;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http request line: \"%V\"", &r->request_line);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http uri: \"%V\"", &r->uri);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http args: \"%V\"", &r->args);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http exten: \"%V\"", &r->exten);
if (r->host_start && r->host_end) {
n = ngx_http_validate_host(r->host_start,
r->host_end - r->host_start);
if (n <= 0) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid host in request line");
ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
return;
}
r->headers_in.server.len = n;
r->headers_in.server.data = r->host_start;
}
if (r->http_version < NGX_HTTP_VERSION_10) {
if (ngx_http_find_virtual_server(r, r->headers_in.server.data,
r->headers_in.server.len)
== NGX_ERROR)
{
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
ngx_http_process_request(r);
return;
}
if (ngx_list_init(&r->headers_in.headers, r->pool, 20,
sizeof(ngx_table_elt_t))
== NGX_ERROR)
{
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
if (ngx_array_init(&r->headers_in.cookies, r->pool, 2,
sizeof(ngx_table_elt_t *))
== NGX_ERROR)
{
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
c->log->action = "reading client request headers";
rev->handler = ngx_http_process_request_headers;
ngx_http_process_request_headers(rev);
return;
}
if (rc != NGX_AGAIN) {
/* there was error while a request line parsing */
ngx_log_error(NGX_LOG_INFO, c->log, 0,
ngx_http_client_errors[rc - NGX_HTTP_CLIENT_ERROR]);
ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
return;
}
/* NGX_AGAIN: a request line parsing is still incomplete */
if (r->header_in->pos == r->header_in->end) {
rv = ngx_http_alloc_large_header_buffer(r, 1);
if (rv == NGX_ERROR) {
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
if (rv == NGX_DECLINED) {
r->request_line.len = r->header_in->end - r->request_start;
r->request_line.data = r->request_start;
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent too long URI");
ngx_http_finalize_request(r, NGX_HTTP_REQUEST_URI_TOO_LARGE);
return;
}
}
}
}
static void
ngx_http_process_request_headers(ngx_event_t *rev)
{
ssize_t n;
ngx_int_t rc, rv;
ngx_str_t header;
ngx_table_elt_t *h;
ngx_connection_t *c;
ngx_http_header_t *hh;
ngx_http_request_t *r;
ngx_http_core_srv_conf_t *cscf;
ngx_http_core_main_conf_t *cmcf;
c = rev->data;
r = c->data;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0,
"http process request header line");
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;
}
cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
rc = NGX_AGAIN;
for ( ;; ) {
if (rc == NGX_AGAIN) {
if (r->header_in->pos == r->header_in->end) {
rv = ngx_http_alloc_large_header_buffer(r, 0);
if (rv == NGX_ERROR) {
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
if (rv == NGX_DECLINED) {
header.len = r->header_in->end - r->header_name_start;
header.data = r->header_name_start;
if (header.len > NGX_MAX_ERROR_STR - 300) {
header.len = NGX_MAX_ERROR_STR - 300;
header.data[header.len++] = '.';
header.data[header.len++] = '.';
header.data[header.len++] = '.';
}
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent too long header line: \"%V\"",
&header);
ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
return;
}
}
n = ngx_http_read_request_header(r);
if (n == NGX_AGAIN || n == NGX_ERROR) {
return;
}
}
rc = ngx_http_parse_header_line(r, r->header_in,
cscf->underscores_in_headers);
if (rc == NGX_OK) {
if (r->invalid_header && cscf->ignore_invalid_headers) {
/* there was error while a header line parsing */
header.len = r->header_end - r->header_name_start;
header.data = r->header_name_start;
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid header line: \"%V\"",
&header);
continue;
}
/* a header line has been parsed successfully */
h = ngx_list_push(&r->headers_in.headers);
if (h == NULL) {
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
h->hash = r->header_hash;
h->key.len = r->header_name_end - r->header_name_start;
h->key.data = r->header_name_start;
h->key.data[h->key.len] = '\0';
h->value.len = r->header_end - r->header_start;
h->value.data = r->header_start;
h->value.data[h->value.len] = '\0';
h->lowcase_key = ngx_pnalloc(r->pool, h->key.len);
if (h->lowcase_key == NULL) {
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return;
}
if (h->key.len == r->lowcase_index) {
ngx_memcpy(h->lowcase_key, r->lowcase_header, h->key.len);
} else {
ngx_strlow(h->lowcase_key, h->key.data, h->key.len);
}
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_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http header: \"%V: %V\"",
&h->key, &h->value);
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,
"http header done");
r->request_length += r->header_in->pos - r->header_in->start;
r->http_state = NGX_HTTP_PROCESS_REQUEST_STATE;
rc = ngx_http_process_request_header(r);
if (rc != NGX_OK) {
return;
}
ngx_http_process_request(r);
return;
}
if (rc == NGX_AGAIN) {
/* a header line parsing is still not complete */
continue;
}
/* rc == NGX_HTTP_PARSE_INVALID_HEADER: "\r" is not followed by "\n" */
header.len = r->header_end - r->header_name_start;
header.data = r->header_name_start;
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent invalid header line: \"%V\\r...\"",
&header);
ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
return;
}
}
static ssize_t
ngx_http_read_request_header(ngx_http_request_t *r)
{
ssize_t n;
ngx_event_t *rev;
ngx_connection_t *c;
ngx_http_core_srv_conf_t *cscf;
c = r->connection;
rev = c->read;
n = r->header_in->last - r->header_in->pos;
if (n > 0) {
return n;
}
if (rev->ready) {
n = c->recv(c, r->header_in->last,
r->header_in->end - r->header_in->last);
} 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);
return NGX_ERROR;
}
return NGX_AGAIN;
}
if (n == 0) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client closed prematurely connection");
}
if (n == 0 || n == NGX_ERROR) {
c->error = 1;
c->log->action = "reading client request headers";
ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
return NGX_ERROR;
}
r->header_in->last += n;
return n;
}
static ngx_int_t
ngx_http_alloc_large_header_buffer(ngx_http_request_t *r,
ngx_uint_t request_line)
{
u_char *old, *new;
ngx_buf_t *b;
ngx_http_connection_t *hc;
ngx_http_core_srv_conf_t *cscf;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http alloc large header buffer");
if (request_line && r->state == 0) {
/* the client fills up the buffer with "\r\n" */
r->request_length += r->header_in->end - r->header_in->start;
r->header_in->pos = r->header_in->start;
r->header_in->last = r->header_in->start;
return NGX_OK;
}
old = request_line ? r->request_start : r->header_name_start;
cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
if (r->state != 0
&& (size_t) (r->header_in->pos - old)
>= cscf->large_client_header_buffers.size)
{
return NGX_DECLINED;
}
hc = r->http_connection;
if (hc->nfree) {
b = hc->free[--hc->nfree];
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http large header free: %p %uz",
b->pos, b->end - b->last);
} else if (hc->nbusy < cscf->large_client_header_buffers.num) {
if (hc->busy == NULL) {
hc->busy = ngx_palloc(r->connection->pool,
cscf->large_client_header_buffers.num * sizeof(ngx_buf_t *));
if (hc->busy == NULL) {
return NGX_ERROR;
}
}
b = ngx_create_temp_buf(r->connection->pool,
cscf->large_client_header_buffers.size);
if (b == NULL) {
return NGX_ERROR;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http large header alloc: %p %uz",
b->pos, b->end - b->last);
} else {
return NGX_DECLINED;
}
hc->busy[hc->nbusy++] = b;
if (r->state == 0) {
/*
* r->state == 0 means that a header line was parsed successfully
* and we do not need to copy incomplete header line and
* to relocate the parser header pointers
*/
r->request_length += r->header_in->end - r->header_in->start;
r->header_in = b;
return NGX_OK;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http large header copy: %d", r->header_in->pos - old);
r->request_length += old - r->header_in->start;
new = b->start;
ngx_memcpy(new, old, r->header_in->pos - old);
b->pos = new + (r->header_in->pos - old);
b->last = new + (r->header_in->pos - old);
if (request_line) {
r->request_start = new;
if (r->request_end) {
r->request_end = new + (r->request_end - old);
}
r->method_end = new + (r->method_end - old);
r->uri_start = new + (r->uri_start - old);
r->uri_end = new + (r->uri_end - old);
if (r->schema_start) {
r->schema_start = new + (r->schema_start - old);
r->schema_end = new + (r->schema_end - old);
}
if (r->host_start) {
r->host_start = new + (r->host_start - old);
if (r->host_end) {
r->host_end = new + (r->host_end - old);
}
}
if (r->port_start) {
r->port_start = new + (r->port_start - old);
r->port_end = new + (r->port_end - old);
}
if (r->uri_ext) {
r->uri_ext = new + (r->uri_ext - old);
}
if (r->args_start) {
r->args_start = new + (r->args_start - old);
}
if (r->http_protocol.data) {
r->http_protocol.data = new + (r->http_protocol.data - old);
}
} else {
r->header_name_start = new;
r->header_name_end = new + (r->header_name_end - old);
r->header_start = new + (r->header_start - old);
r->header_end = new + (r->header_end - old);
}
r->header_in = b;
return NGX_OK;
}
static ngx_int_t
ngx_http_process_header_line(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
ngx_table_elt_t **ph;
ph = (ngx_table_elt_t **) ((char *) &r->headers_in + offset);
if (*ph == NULL) {
*ph = h;
}
return NGX_OK;
}
static ngx_int_t
ngx_http_process_unique_header_line(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
ngx_table_elt_t **ph;
ph = (ngx_table_elt_t **) ((char *) &r->headers_in + offset);
if (*ph == NULL) {
*ph = h;
return NGX_OK;
}
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
"client sent duplicate header line: \"%V: %V\", "
"previous value: \"%V: %V\"",
&h->key, &h->value, &(*ph)->key, &(*ph)->value);
ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
return NGX_ERROR;
}
static ngx_int_t
ngx_http_process_host(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
ssize_t len;
if (r->headers_in.host == NULL) {
r->headers_in.host = h;
}
len = ngx_http_validate_host(h->value.data, h->value.len);
if (len <= 0) {
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
"client sent invalid host header");
ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
return NGX_ERROR;
}
if (r->headers_in.server.len) {
return NGX_OK;
}
r->headers_in.server.len = len;
r->headers_in.server.data = h->value.data;
return NGX_OK;
}
static ngx_int_t
ngx_http_process_connection(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
if (ngx_strcasestrn(h->value.data, "close", 5 - 1)) {
r->headers_in.connection_type = NGX_HTTP_CONNECTION_CLOSE;
} else if (ngx_strcasestrn(h->value.data, "keep-alive", 10 - 1)) {
r->headers_in.connection_type = NGX_HTTP_CONNECTION_KEEP_ALIVE;
}
return NGX_OK;
}
static ngx_int_t
ngx_http_process_user_agent(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
u_char *user_agent, *msie;
if (r->headers_in.user_agent) {
return NGX_OK;
}
r->headers_in.user_agent = h;
/* check some widespread browsers while the header is in CPU cache */
user_agent = h->value.data;
msie = ngx_strstrn(user_agent, "MSIE ", 5 - 1);
if (msie && msie + 7 < user_agent + h->value.len) {
r->headers_in.msie = 1;
if (msie[6] == '.') {
switch (msie[5]) {
case '4':
r->headers_in.msie4 = 1;
/* fall through */
case '5':
case '6':
r->headers_in.msie6 = 1;
}
}
#if 0
/* MSIE ignores the SSL "close notify" alert */
if (c->ssl) {
c->ssl->no_send_shutdown = 1;
}
#endif
}
if (ngx_strstrn(user_agent, "Opera", 5 - 1)) {
r->headers_in.opera = 1;
r->headers_in.msie = 0;
r->headers_in.msie4 = 0;
r->headers_in.msie6 = 0;
}
if (!r->headers_in.msie && !r->headers_in.opera) {
if (ngx_strstrn(user_agent, "Gecko/", 6 - 1)) {
r->headers_in.gecko = 1;
} else if (ngx_strstrn(user_agent, "Konqueror", 9 - 1)) {
r->headers_in.konqueror = 1;
}
}
return NGX_OK;
}
static ngx_int_t
ngx_http_process_cookie(ngx_http_request_t *r, ngx_table_elt_t *h,
ngx_uint_t offset)
{
ngx_table_elt_t **cookie;
cookie = ngx_array_push(&r->headers_in.cookies);
if (cookie) {
*cookie = h;
return NGX_OK;
}
ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return NGX_ERROR;
}
static ngx_int_t
ngx_http_process_request_header(ngx_http_request_t *r)
{
if (ngx_http_find_virtual_server(r, r->headers_in.server.data,
r->headers_in.server.len)
== NGX_ERROR)
{
ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
return NGX_ERROR;
}
if (r->headers_in.host == NULL && r->http_version > NGX_HTTP_VERSION_10) {
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
"client sent HTTP/1.1 request without \"Host\" header");
ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
return NGX_ERROR;
}
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, r->connection->log, 0,
"client sent invalid \"Content-Length\" header");
ngx_http_finalize_request(r, NGX_HTTP_LENGTH_REQUIRED);
return NGX_ERROR;
}
}
if (r->method & NGX_HTTP_PUT && r->headers_in.content_length_n == -1) {
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
"client sent %V method without \"Content-Length\" header",
&r->method_name);
ngx_http_finalize_request(r, NGX_HTTP_LENGTH_REQUIRED);
return NGX_ERROR;
}
if (r->method & NGX_HTTP_TRACE) {
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
"client sent TRACE method");
ngx_http_finalize_request(r, NGX_HTTP_NOT_ALLOWED);
return NGX_ERROR;
}
if (r->headers_in.transfer_encoding
&& ngx_strcasestrn(r->headers_in.transfer_encoding->value.data,
"chunked", 7 - 1))
{
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
"client sent \"Transfer-Encoding: chunked\" header");
ngx_http_finalize_request(r, NGX_HTTP_LENGTH_REQUIRED);
return NGX_ERROR;
}
if (r->headers_in.connection_type == NGX_HTTP_CONNECTION_KEEP_ALIVE) {
if (r->headers_in.keep_alive) {
r->headers_in.keep_alive_n =
ngx_atotm(r->headers_in.keep_alive->value.data,
r->headers_in.keep_alive->value.len);
}
}
return NGX_OK;
}
static void
ngx_http_process_request(ngx_http_request_t *r)
{
ngx_connection_t *c;
c = r->connection;
if (r->plain_http) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent plain HTTP request to HTTPS port");
ngx_http_finalize_request(r, NGX_HTTP_TO_HTTPS);
return;
}
#if (NGX_HTTP_SSL)
if (c->ssl) {
long rc;
X509 *cert;
ngx_http_ssl_srv_conf_t *sscf;
sscf = ngx_http_get_module_srv_conf(r, ngx_http_ssl_module);
if (sscf->verify == 1) {
rc = SSL_get_verify_result(c->ssl->connection);
if (rc != X509_V_OK) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client SSL certificate verify error: (%l:%s)",
rc, X509_verify_cert_error_string(rc));
ngx_ssl_remove_cached_session(sscf->ssl.ctx,
(SSL_get0_session(c->ssl->connection)));
ngx_http_finalize_request(r, NGX_HTTPS_CERT_ERROR);
return;
}
cert = SSL_get_peer_certificate(c->ssl->connection);
if (cert == NULL) {
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client sent no required SSL certificate");
ngx_ssl_remove_cached_session(sscf->ssl.ctx,
(SSL_get0_session(c->ssl->connection)));
ngx_http_finalize_request(r, NGX_HTTPS_NO_CERT);
return;
}
X509_free(cert);
}
}
#endif
if (c->read->timer_set) {
ngx_del_timer(c->read);
}
#if (NGX_STAT_STUB)
ngx_atomic_fetch_add(ngx_stat_reading, -1);
r->stat_reading = 0;
ngx_atomic_fetch_add(ngx_stat_writing, 1);
r->stat_writing = 1;
#endif
c->read->handler = ngx_http_request_handler;
c->write->handler = ngx_http_request_handler;
r->read_event_handler = ngx_http_block_reading;
ngx_http_handler(r);
ngx_http_run_posted_requests(c);
}
static ssize_t
ngx_http_validate_host(u_char *host, size_t len)
{
u_char ch;
size_t i, last;
ngx_uint_t dot;
last = len;
dot = 0;
for (i = 0; i < len; i++) {
ch = host[i];
if (ch == '.') {
if (dot) {
return -1;
}
dot = 1;
continue;
}
dot = 0;
if (ch == ':') {
last = i;
continue;
}
if (ch == '/' || ch == '\0') {
return -1;
}
#if (NGX_WIN32)
if (ch == '\\') {
return -1;
}
#endif
}
if (dot) {
last--;
}
return last;
}
static ngx_int_t
ngx_http_find_virtual_server(ngx_http_request_t *r, u_char *host, size_t len)
{
u_char *server;
ngx_uint_t hash;
ngx_http_core_loc_conf_t *clcf;
ngx_http_core_srv_conf_t *cscf;
u_char buf[32];
if (r->virtual_names == NULL) {
return NGX_DECLINED;
}
if (len <= 32) {
server = buf;
} else {
server = ngx_pnalloc(r->pool, len);
if (server == NULL) {
return NGX_ERROR;
}
}
hash = ngx_hash_strlow(server, host, len);
cscf = ngx_hash_find_combined(&r->virtual_names->names, hash, server, len);
if (cscf) {
goto found;
}
#if (NGX_PCRE)
if (r->virtual_names->nregex) {
ngx_int_t n;
ngx_uint_t i;
ngx_str_t name;
ngx_http_server_name_t *sn;
name.len = len;
name.data = server;
sn = r->virtual_names->regex;
for (i = 0; i < r->virtual_names->nregex; i++) {
n = ngx_regex_exec(sn[i].regex, &name, NULL, 0);
if (n == NGX_REGEX_NO_MATCHED) {
continue;
}
if (n < 0) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
ngx_regex_exec_n
" failed: %d on \"%V\" using \"%V\"",
n, &name, &sn[i].name);
return NGX_ERROR;
}
/* match */
cscf = sn[i].core_srv_conf;
goto found;
}
}
#endif
return NGX_OK;
found:
r->srv_conf = cscf->ctx->srv_conf;
r->loc_conf = cscf->ctx->loc_conf;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
r->connection->log->file = clcf->err_log->file;
if (!(r->connection->log->log_level & NGX_LOG_DEBUG_CONNECTION)) {
r->connection->log->log_level = clcf->err_log->log_level;
}
return NGX_OK;
}
static void
ngx_http_request_handler(ngx_event_t *ev)
{
ngx_connection_t *c;
ngx_http_request_t *r;
ngx_http_log_ctx_t *ctx;
c = ev->data;
r = c->data;
ctx = c->log->data;
ctx->current_request = r;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http run request: \"%V?%V\"", &r->uri, &r->args);
if (ev->write) {
r->write_event_handler(r);
} else {
r->read_event_handler(r);
}
ngx_http_run_posted_requests(c);
}
void
ngx_http_run_posted_requests(ngx_connection_t *c)
{
ngx_http_request_t *r;
ngx_http_log_ctx_t *ctx;
ngx_http_posted_request_t *pr;
for ( ;; ) {
if (c->destroyed) {
return;
}
r = c->data;
pr = r->main->posted_requests;
if (pr == NULL) {
return;
}
r->main->posted_requests = pr->next;
r = pr->request;
ctx = c->log->data;
ctx->current_request = r;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http posted request: \"%V?%V\"", &r->uri, &r->args);
r->write_event_handler(r);
}
}
ngx_int_t
ngx_http_post_request(ngx_http_request_t *r)
{
ngx_http_posted_request_t *pr, **p;
pr = ngx_palloc(r->pool, sizeof(ngx_http_posted_request_t));
if (pr == NULL) {
return NGX_ERROR;
}
pr->request = r;
pr->next = NULL;
for (p = &r->main->posted_requests; *p; p = &(*p)->next) { /* void */ }
*p = pr;
return NGX_OK;
}
void
ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
{
ngx_connection_t *c;
ngx_http_request_t *pr;
ngx_http_core_loc_conf_t *clcf;
if (rc == NGX_DONE) {
/* the request pool may be already destroyed */
return;
}
c = r->connection;
ngx_log_debug4(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http finalize request: %d, \"%V?%V\" %d",
rc, &r->uri, &r->args, r == c->data);
if (rc == NGX_DECLINED) {
r->content_handler = NULL;
r->write_event_handler = ngx_http_core_run_phases;
ngx_http_core_run_phases(r);
return;
}
if (r != r->main && r->post_subrequest) {
rc = r->post_subrequest->handler(r, r->post_subrequest->data, rc);
}
if (rc == NGX_ERROR
|| rc == NGX_HTTP_REQUEST_TIME_OUT
|| rc == NGX_HTTP_CLIENT_CLOSED_REQUEST
|| c->error)
{
if (rc > 0 && r->headers_out.status == 0) {
r->headers_out.status = rc;
}
if (ngx_http_post_action(r) == NGX_OK) {
return;
}
ngx_http_close_request(r, 0);
return;
}
if (rc >= NGX_HTTP_SPECIAL_RESPONSE
|| rc == NGX_HTTP_CREATED
|| rc == NGX_HTTP_NO_CONTENT)
{
if (rc == NGX_HTTP_CLOSE) {
ngx_http_close_request(r, rc);
return;
}
if (r == r->main) {
if (c->read->timer_set) {
ngx_del_timer(c->read);
}
if (c->write->timer_set) {
ngx_del_timer(c->write);
}
}
c->read->handler = ngx_http_request_handler;
c->write->handler = ngx_http_request_handler;
ngx_http_finalize_request(r, ngx_http_special_response_handler(r, rc));
return;
}
if (r != r->main) {
if (r->buffered || r->postponed) {
if (ngx_http_set_write_handler(r) != NGX_OK) {
ngx_http_close_request(r->main, 0);
}
return;
}
#if (NGX_DEBUG)
if (r != c->data) {
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http finalize non-active request: \"%V?%V\"",
&r->uri, &r->args);
}
#endif
pr = r->parent;
if (r == c->data) {
if (!r->logged) {
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (clcf->log_subrequest) {
ngx_http_log_request(r);
}
r->logged = 1;
} else {
ngx_log_error(NGX_LOG_ALERT, c->log, 0,
"subrequest: \"%V?%V\" logged again",
&r->uri, &r->args);
}
r->done = 1;
if (pr->postponed && pr->postponed->request == r) {
pr->postponed = pr->postponed->next;
}
c->data = pr;
} else {
r->write_event_handler = ngx_http_request_finalizer;
if (r->waited) {
r->done = 1;
}
}
if (ngx_http_post_request(pr) != NGX_OK) {
ngx_http_close_request(r->main, 0);
return;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http wake parent request: \"%V?%V\"",
&pr->uri, &pr->args);
return;
}
if (r->buffered || c->buffered || r->postponed) {
if (ngx_http_set_write_handler(r) != NGX_OK) {
ngx_http_close_request(r, 0);
}
return;
}
if (r != c->data) {
ngx_log_error(NGX_LOG_ALERT, c->log, 0,
"http finalize non-active request: \"%V?%V\"",
&r->uri, &r->args);
return;
}
r->done = 1;
if (!r->post_action) {
r->request_complete = 1;
}
if (ngx_http_post_action(r) == NGX_OK) {
return;
}
if (c->read->timer_set) {
ngx_del_timer(c->read);
}
if (c->write->timer_set) {
c->write->delayed = 0;
ngx_del_timer(c->write);
}
if (c->destroyed) {
return;
}
if (c->read->eof) {
ngx_http_close_request(r, 0);
return;
}
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (!ngx_terminate
&& !ngx_exiting
&& r->keepalive
&& clcf->keepalive_timeout > 0)
{
ngx_http_set_keepalive(r);
return;
} else if (r->lingering_close && clcf->lingering_timeout > 0) {
ngx_http_set_lingering_close(r);
return;
}
ngx_http_close_request(r, 0);
}
static ngx_int_t
ngx_http_set_write_handler(ngx_http_request_t *r)
{
ngx_event_t *wev;
ngx_http_core_loc_conf_t *clcf;
r->http_state = NGX_HTTP_WRITING_REQUEST_STATE;
r->read_event_handler = ngx_http_test_reading;
r->write_event_handler = ngx_http_writer;
wev = r->connection->write;
if (wev->ready && wev->delayed) {
return NGX_OK;
}
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (!wev->delayed) {
ngx_add_timer(wev, clcf->send_timeout);
}
if (ngx_handle_write_event(wev, clcf->send_lowat) != NGX_OK) {
ngx_http_close_request(r, 0);
return NGX_ERROR;
}
return NGX_OK;
}
static void
ngx_http_writer(ngx_http_request_t *r)
{
int rc;
ngx_event_t *wev;
ngx_connection_t *c;
ngx_http_core_loc_conf_t *clcf;
c = r->connection;
wev = c->write;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, wev->log, 0,
"http writer handler: \"%V?%V\"", &r->uri, &r->args);
clcf = ngx_http_get_module_loc_conf(r->main, ngx_http_core_module);
if (wev->timedout) {
if (!wev->delayed) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
"client timed out");
c->timedout = 1;
ngx_http_finalize_request(r, NGX_HTTP_REQUEST_TIME_OUT);
return;
}
wev->timedout = 0;
wev->delayed = 0;
if (!wev->ready) {
ngx_add_timer(wev, clcf->send_timeout);
if (ngx_handle_write_event(wev, clcf->send_lowat) != NGX_OK) {
ngx_http_close_request(r, 0);
}
return;
}
} else {
if (wev->delayed) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, wev->log, 0,
"http writer delayed");
if (ngx_handle_write_event(wev, clcf->send_lowat) != NGX_OK) {
ngx_http_close_request(r, 0);
}
return;
}
}
rc = ngx_http_output_filter(r, NULL);
if (c->destroyed) {
return;
}
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http writer output filter: %d, \"%V?%V\"",
rc, &r->uri, &r->args);
if (r->buffered || r->postponed || (r == r->main && c->buffered)) {
if (!wev->ready && !wev->delayed) {
ngx_add_timer(wev, clcf->send_timeout);
}
if (ngx_handle_write_event(wev, clcf->send_lowat) != NGX_OK) {
ngx_http_close_request(r, 0);
}
return;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, wev->log, 0,
"http writer done: \"%V?%V\"", &r->uri, &r->args);
ngx_http_finalize_request(r, rc);
}
static void
ngx_http_request_finalizer(ngx_http_request_t *r)
{
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http finalizer done: \"%V?%V\"", &r->uri, &r->args);
ngx_http_finalize_request(r, 0);
}
void
ngx_http_block_reading(ngx_http_request_t *r)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http reading blocked");
/* aio does not call this handler */
if ((ngx_event_flags & NGX_USE_LEVEL_EVENT)
&& r->connection->read->active)
{
if (ngx_del_event(r->connection->read, NGX_READ_EVENT, 0) != NGX_OK) {
ngx_http_close_request(r, 0);
}
}
}
void
ngx_http_test_reading(ngx_http_request_t *r)
{
int n;
char buf[1];
ngx_err_t err;
ngx_event_t *rev;
ngx_connection_t *c;
c = r->connection;
rev = c->read;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http test reading");
#if (NGX_HAVE_KQUEUE)
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
if (!rev->pending_eof) {
return;
}
rev->eof = 1;
c->error = 1;
err = rev->kq_errno;
goto closed;
}
#endif
n = recv(c->fd, buf, 1, MSG_PEEK);
if (n == 0) {
rev->eof = 1;
c->error = 1;
err = 0;
goto closed;
} else if (n == -1) {
err = ngx_socket_errno;
if (err != NGX_EAGAIN) {
rev->eof = 1;
c->error = 1;
goto closed;
}
}
/* aio does not call this handler */
if ((ngx_event_flags & NGX_USE_LEVEL_EVENT) && rev->active) {
if (ngx_del_event(rev, NGX_READ_EVENT, 0) != NGX_OK) {
ngx_http_close_request(r, 0);
}
}
return;
closed:
if (err) {
rev->error = 1;
}
ngx_log_error(NGX_LOG_INFO, c->log, err,
"client closed prematurely connection");
ngx_http_finalize_request(r, 0);
}
static void
ngx_http_set_keepalive(ngx_http_request_t *r)
{
int tcp_nodelay;
ngx_int_t i;
ngx_buf_t *b, *f;
ngx_event_t *rev, *wev;
ngx_connection_t *c;
ngx_http_connection_t *hc;
ngx_http_core_srv_conf_t *cscf;
ngx_http_core_loc_conf_t *clcf;
c = r->connection;
rev = c->read;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "set http keepalive handler");
if (r->discard_body) {
r->lingering_time = ngx_time() + (time_t) (clcf->lingering_time / 1000);
ngx_add_timer(rev, clcf->lingering_timeout);
return;
}
c->log->action = "closing request";
hc = r->http_connection;
b = r->header_in;
if (b->pos < b->last) {
/* the pipelined request */
if (b != c->buffer) {
/*
* If the large header buffers were allocated while the previous
* request processing then we do not use c->buffer for
* the pipelined request (see ngx_http_init_request()).
*
* Now we would move the large header buffers to the free list.
*/
cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
if (hc->free == NULL) {
hc->free = ngx_palloc(c->pool,
cscf->large_client_header_buffers.num * sizeof(ngx_buf_t *));
if (hc->free == NULL) {
ngx_http_close_request(r, 0);
return;
}
}
for (i = 0; i < hc->nbusy - 1; i++) {
f = hc->busy[i];
hc->free[hc->nfree++] = f;
f->pos = f->start;
f->last = f->start;
}
hc->busy[0] = b;
hc->nbusy = 1;
}
}
ngx_http_request_done(r, 0);
c->data = hc;
ngx_add_timer(rev, clcf->keepalive_timeout);
if (ngx_handle_read_event(rev, 0) != NGX_OK) {
ngx_http_close_connection(c);
return;
}
wev = c->write;
wev->handler = ngx_http_empty_handler;
if (b->pos < b->last) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "pipelined request");
#if (NGX_STAT_STUB)
ngx_atomic_fetch_add(ngx_stat_reading, 1);
#endif
hc->pipeline = 1;
c->log->action = "reading client pipelined request line";
rev->handler = ngx_http_init_request;
ngx_post_event(rev, &ngx_posted_events);
return;
}
hc->pipeline = 0;
/*
* To keep a memory footprint as small as possible for an idle
* keepalive connection we try to free the ngx_http_request_t and
* c->buffer's memory if they were allocated outside the c->pool.
* The large header buffers are always allocated outside the c->pool and
* are freed too.
*/
if (ngx_pfree(c->pool, r) == NGX_OK) {
hc->request = NULL;
}
b = c->buffer;
if (ngx_pfree(c->pool, b->start) == NGX_OK) {
/*
* the special note for ngx_http_keepalive_handler() that
* c->buffer's memory was freed
*/
b->pos = NULL;
} else {
b->pos = b->start;
b->last = b->start;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, "hc free: %p %d",
hc->free, hc->nfree);
if (hc->free) {
for (i = 0; i < hc->nfree; i++) {
ngx_pfree(c->pool, hc->free[i]->start);
hc->free[i] = NULL;
}
hc->nfree = 0;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, "hc busy: %p %d",
hc->busy, hc->nbusy);
if (hc->busy) {
for (i = 0; i < hc->nbusy; i++) {
ngx_pfree(c->pool, hc->busy[i]->start);
hc->busy[i] = NULL;
}
hc->nbusy = 0;
}
#if (NGX_HTTP_SSL)
if (c->ssl) {
ngx_ssl_free_buffer(c);
}
#endif
rev->handler = ngx_http_keepalive_handler;
if (wev->active && (ngx_event_flags & NGX_USE_LEVEL_EVENT)) {
if (ngx_del_event(wev, NGX_WRITE_EVENT, 0) != NGX_OK) {
ngx_http_close_connection(c);
return;
}
}
c->log->action = "keepalive";
if (c->tcp_nopush == NGX_TCP_NOPUSH_SET) {
if (ngx_tcp_push(c->fd) == -1) {
ngx_connection_error(c, ngx_socket_errno, ngx_tcp_push_n " failed");
ngx_http_close_connection(c);
return;
}
c->tcp_nopush = NGX_TCP_NOPUSH_UNSET;
tcp_nodelay = ngx_tcp_nodelay_and_tcp_nopush ? 1 : 0;
} else {
tcp_nodelay = 1;
}
if (tcp_nodelay
&& clcf->tcp_nodelay
&& c->tcp_nodelay == NGX_TCP_NODELAY_UNSET)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "tcp_nodelay");
if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY,
(const void *) &tcp_nodelay, sizeof(int))
== -1)
{
ngx_connection_error(c, ngx_socket_errno,
"setsockopt(TCP_NODELAY) failed");
ngx_http_close_connection(c);
return;
}
c->tcp_nodelay = NGX_TCP_NODELAY_SET;
}
#if 0
/* if ngx_http_request_t was freed then we need some other place */
r->http_state = NGX_HTTP_KEEPALIVE_STATE;
#endif
c->idle = 1;
if (rev->ready) {
ngx_post_event(rev, &ngx_posted_events);
}
}
static void
ngx_http_keepalive_handler(ngx_event_t *rev)
{
size_t size;
ssize_t n;
ngx_buf_t *b;
ngx_connection_t *c;
c = rev->data;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http keepalive handler");
if (rev->timedout || c->close) {
ngx_http_close_connection(c);
return;
}
#if (NGX_HAVE_KQUEUE)
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
if (rev->pending_eof) {
c->log->handler = NULL;
ngx_log_error(NGX_LOG_INFO, c->log, rev->kq_errno,
"kevent() reported that client %V closed "
"keepalive connection", &c->addr_text);
#if (NGX_HTTP_SSL)
if (c->ssl) {
c->ssl->no_send_shutdown = 1;
}
#endif
ngx_http_close_connection(c);
return;
}
}
#endif
b = c->buffer;
size = b->end - b->start;
if (b->pos == NULL) {
/*
* The c->buffer's memory was freed by ngx_http_set_keepalive().
* However, the c->buffer->start and c->buffer->end were not changed
* to keep the buffer size.
*/
b->pos = ngx_palloc(c->pool, size);
if (b->pos == NULL) {
ngx_http_close_connection(c);
return;
}
b->start = b->pos;
b->last = b->pos;
b->end = b->pos + size;
}
/*
* MSIE closes a keepalive connection with RST flag
* so we ignore ECONNRESET here.
*/
c->log_error = NGX_ERROR_IGNORE_ECONNRESET;
ngx_set_socket_errno(0);
n = c->recv(c, b->last, size);
c->log_error = NGX_ERROR_INFO;
if (n == NGX_AGAIN) {
if (ngx_handle_read_event(rev, 0) != NGX_OK) {
ngx_http_close_connection(c);
}
return;
}
if (n == NGX_ERROR) {
ngx_http_close_connection(c);
return;
}
c->log->handler = NULL;
if (n == 0) {
ngx_log_error(NGX_LOG_INFO, c->log, ngx_socket_errno,
"client %V closed keepalive connection", &c->addr_text);
ngx_http_close_connection(c);
return;
}
b->last += n;
#if (NGX_STAT_STUB)
ngx_atomic_fetch_add(ngx_stat_reading, 1);
#endif
c->log->handler = ngx_http_log_error;
c->log->action = "reading client request line";
c->idle = 0;
ngx_http_init_request(rev);
}
static void
ngx_http_set_lingering_close(ngx_http_request_t *r)
{
ngx_event_t *rev, *wev;
ngx_connection_t *c;
ngx_http_core_loc_conf_t *clcf;
c = r->connection;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
rev = c->read;
rev->handler = ngx_http_lingering_close_handler;
r->lingering_time = ngx_time() + (time_t) (clcf->lingering_time / 1000);
ngx_add_timer(rev, clcf->lingering_timeout);
if (ngx_handle_read_event(rev, 0) != NGX_OK) {
ngx_http_close_request(r, 0);
return;
}
wev = c->write;
wev->handler = ngx_http_empty_handler;
if (wev->active && (ngx_event_flags & NGX_USE_LEVEL_EVENT)) {
if (ngx_del_event(wev, NGX_WRITE_EVENT, 0) != NGX_OK) {
ngx_http_close_request(r, 0);
return;
}
}
if (ngx_shutdown_socket(c->fd, NGX_WRITE_SHUTDOWN) == -1) {
ngx_connection_error(c, ngx_socket_errno,
ngx_shutdown_socket_n " failed");
ngx_http_close_request(r, 0);
return;
}
if (rev->ready) {
ngx_http_lingering_close_handler(rev);
}
}
static void
ngx_http_lingering_close_handler(ngx_event_t *rev)
{
ssize_t n;
ngx_msec_t timer;
ngx_connection_t *c;
ngx_http_request_t *r;
ngx_http_core_loc_conf_t *clcf;
u_char buffer[NGX_HTTP_LINGERING_BUFFER_SIZE];
c = rev->data;
r = c->data;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http lingering close handler");
if (rev->timedout) {
c->timedout = 1;
ngx_http_close_request(r, 0);
return;
}
timer = (ngx_msec_t) (r->lingering_time - ngx_time());
if (timer <= 0) {
ngx_http_close_request(r, 0);
return;
}
do {
n = c->recv(c, buffer, NGX_HTTP_LINGERING_BUFFER_SIZE);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "lingering read: %d", n);
if (n == NGX_ERROR || n == 0) {
ngx_http_close_request(r, 0);
return;
}
} while (rev->ready);
if (ngx_handle_read_event(rev, 0) != NGX_OK) {
ngx_http_close_request(r, 0);
return;
}
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
timer *= 1000;
if (timer > clcf->lingering_timeout) {
timer = clcf->lingering_timeout;
}
ngx_add_timer(rev, timer);
}
void
ngx_http_empty_handler(ngx_event_t *wev)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, wev->log, 0, "http empty handler");
return;
}
void
ngx_http_request_empty_handler(ngx_http_request_t *r)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http request empty handler");
return;
}
ngx_int_t
ngx_http_send_special(ngx_http_request_t *r, ngx_uint_t flags)
{
ngx_buf_t *b;
ngx_chain_t out;
b = ngx_calloc_buf(r->pool);
if (b == NULL) {
return NGX_ERROR;
}
if (flags & NGX_HTTP_LAST) {
b->last_buf = 1;
}
if (flags & NGX_HTTP_FLUSH) {
b->flush = 1;
}
out.buf = b;
out.next = NULL;
return ngx_http_output_filter(r, &out);
}
static ngx_int_t
ngx_http_post_action(ngx_http_request_t *r)
{
ngx_http_core_loc_conf_t *clcf;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (clcf->post_action.data == NULL) {
return NGX_DECLINED;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"post action: \"%V\"", &clcf->post_action);
r->http_version = NGX_HTTP_VERSION_9;
r->header_only = 1;
r->post_action = 1;
r->read_event_handler = ngx_http_block_reading;
if (clcf->post_action.data[0] == '/') {
ngx_http_internal_redirect(r, &clcf->post_action, NULL);
} else {
ngx_http_named_location(r, &clcf->post_action);
}
return NGX_OK;
}
static void
ngx_http_close_request(ngx_http_request_t *r, ngx_int_t error)
{
ngx_connection_t *c;
c = r->connection;
ngx_http_request_done(r->main, error);
ngx_http_close_connection(c);
}
static void
ngx_http_request_done(ngx_http_request_t *r, ngx_int_t error)
{
ngx_log_t *log;
struct linger linger;
ngx_http_cleanup_t *cln;
ngx_http_log_ctx_t *ctx;
ngx_http_core_loc_conf_t *clcf;
log = r->connection->log;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, log, 0, "http close request");
if (r->pool == NULL) {
ngx_log_error(NGX_LOG_ALERT, log, 0, "http request already closed");
return;
}
for (cln = r->cleanup; cln; cln = cln->next) {
if (cln->handler) {
cln->handler(cln->data);
}
}
#if (NGX_STAT_STUB)
if (r->stat_reading) {
ngx_atomic_fetch_add(ngx_stat_reading, -1);
}
if (r->stat_writing) {
ngx_atomic_fetch_add(ngx_stat_writing, -1);
}
#endif
if (error && r->headers_out.status == 0) {
r->headers_out.status = error;
}
log->action = "logging request";
ngx_http_log_request(r);
log->action = "closing request";
if (r->connection->timedout) {
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
if (clcf->reset_timedout_connection) {
linger.l_onoff = 1;
linger.l_linger = 0;
if (setsockopt(r->connection->fd, SOL_SOCKET, SO_LINGER,
(const void *) &linger, sizeof(struct linger)) == -1)
{
ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
"setsockopt(SO_LINGER) failed");
}
}
}
/* the various request strings were allocated from r->pool */
ctx = log->data;
ctx->request = NULL;
r->request_line.len = 0;
r->connection->destroyed = 1;
ngx_destroy_pool(r->pool);
}
static void
ngx_http_log_request(ngx_http_request_t *r)
{
ngx_uint_t i, n;
ngx_http_handler_pt *log_handler;
ngx_http_core_main_conf_t *cmcf;
cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
log_handler = cmcf->phases[NGX_HTTP_LOG_PHASE].handlers.elts;
n = cmcf->phases[NGX_HTTP_LOG_PHASE].handlers.nelts;
for (i = 0; i < n; i++) {
log_handler[i](r);
}
}
static void
ngx_http_close_connection(ngx_connection_t *c)
{
ngx_pool_t *pool;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"close http connection: %d", c->fd);
#if (NGX_HTTP_SSL)
if (c->ssl) {
if (ngx_ssl_shutdown(c) == NGX_AGAIN) {
c->ssl->handler = ngx_http_close_connection;
return;
}
}
#endif
#if (NGX_STAT_STUB)
ngx_atomic_fetch_add(ngx_stat_active, -1);
#endif
c->destroyed = 1;
pool = c->pool;
ngx_close_connection(c);
ngx_destroy_pool(pool);
}
static u_char *
ngx_http_log_error(ngx_log_t *log, u_char *buf, size_t len)
{
u_char *p;
ngx_http_request_t *r;
ngx_http_log_ctx_t *ctx;
if (log->action) {
p = ngx_snprintf(buf, len, " while %s", log->action);
len -= p - buf;
buf = p;
}
ctx = log->data;
p = ngx_snprintf(buf, len, ", client: %V", &ctx->connection->addr_text);
len -= p - buf;
r = ctx->request;
if (r) {
return r->log_handler(r, ctx->current_request, p, len);
} else {
p = ngx_snprintf(p, len, ", server: %V",
&ctx->connection->listening->addr_text);
}
return p;
}
static u_char *
ngx_http_log_error_handler(ngx_http_request_t *r, ngx_http_request_t *sr,
u_char *buf, size_t len)
{
char *uri_separator;
u_char *p;
ngx_http_upstream_t *u;
ngx_http_core_srv_conf_t *cscf;
cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
p = ngx_snprintf(buf, len, ", server: %V", &cscf->server_name);
len -= p - buf;
buf = p;
if (r->request_line.data == NULL && r->request_start) {
for (p = r->request_start; p < r->header_in->last; p++) {
if (*p == CR || *p == LF) {
break;
}
}
r->request_line.len = p - r->request_start;
r->request_line.data = r->request_start;
}
if (r->request_line.len) {
p = ngx_snprintf(buf, len, ", request: \"%V\"", &r->request_line);
len -= p - buf;
buf = p;
}
if (r != sr) {
p = ngx_snprintf(buf, len, ", subrequest: \"%V\"", &sr->uri);
len -= p - buf;
buf = p;
}
u = sr->upstream;
if (u && u->peer.name) {
uri_separator = "";
#if (NGX_HAVE_UNIX_DOMAIN)
if (u->peer.sockaddr && u->peer.sockaddr->sa_family == AF_UNIX) {
uri_separator = ":";
}
#endif
p = ngx_snprintf(buf, len, ", upstream: \"%V%V%s%V\"",
&u->schema, u->peer.name,
uri_separator, &u->uri);
len -= p - buf;
buf = p;
}
if (r->headers_in.host) {
p = ngx_snprintf(buf, len, ", host: \"%V\"",
&r->headers_in.host->value);
len -= p - buf;
buf = p;
}
if (r->headers_in.referer) {
p = ngx_snprintf(buf, len, ", referrer: \"%V\"",
&r->headers_in.referer->value);
buf = p;
}
return buf;
}