lighttpd 1.4.x https://www.lighttpd.net/
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#include "first.h"
#include "base.h"
#include "buffer.h"
#include "log.h"
#include "connections.h"
#include "fdevent.h"
#include "configfile.h"
#include "request.h"
#include "response.h"
#include "network.h"
#include "http_chunk.h"
#include "stat_cache.h"
#include "joblist.h"
#include "plugin.h"
#include "inet_ntop_cache.h"
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#ifdef HAVE_SYS_FILIO_H
# include <sys/filio.h>
#endif
#include "sys-socket.h"
typedef struct {
PLUGIN_DATA;
} plugin_data;
static connection *connections_get_new_connection(server *srv) {
connections *conns = srv->conns;
size_t i;
if (conns->size == 0) {
conns->size = srv->max_conns >= 128 ? 128 : srv->max_conns > 16 ? 16 : srv->max_conns;
conns->ptr = NULL;
conns->ptr = malloc(sizeof(*conns->ptr) * conns->size);
force_assert(NULL != conns->ptr);
for (i = 0; i < conns->size; i++) {
conns->ptr[i] = connection_init(srv);
}
} else if (conns->size == conns->used) {
conns->size += srv->max_conns >= 128 ? 128 : 16;
conns->ptr = realloc(conns->ptr, sizeof(*conns->ptr) * conns->size);
force_assert(NULL != conns->ptr);
for (i = conns->used; i < conns->size; i++) {
conns->ptr[i] = connection_init(srv);
}
}
connection_reset(srv, conns->ptr[conns->used]);
#if 0
fprintf(stderr, "%s.%d: add: ", __FILE__, __LINE__);
for (i = 0; i < conns->used + 1; i++) {
fprintf(stderr, "%d ", conns->ptr[i]->fd);
}
fprintf(stderr, "\n");
#endif
conns->ptr[conns->used]->ndx = conns->used;
return conns->ptr[conns->used++];
}
static int connection_del(server *srv, connection *con) {
size_t i;
connections *conns = srv->conns;
connection *temp;
if (con == NULL) return -1;
if (-1 == con->ndx) return -1;
buffer_reset(con->uri.authority);
buffer_reset(con->uri.path);
buffer_reset(con->uri.query);
buffer_reset(con->request.orig_uri);
i = con->ndx;
/* not last element */
if (i != conns->used - 1) {
temp = conns->ptr[i];
conns->ptr[i] = conns->ptr[conns->used - 1];
conns->ptr[conns->used - 1] = temp;
conns->ptr[i]->ndx = i;
conns->ptr[conns->used - 1]->ndx = -1;
}
conns->used--;
con->ndx = -1;
#if 0
fprintf(stderr, "%s.%d: del: (%d)", __FILE__, __LINE__, conns->used);
for (i = 0; i < conns->used; i++) {
fprintf(stderr, "%d ", conns->ptr[i]->fd);
}
fprintf(stderr, "\n");
#endif
return 0;
}
static int connection_close(server *srv, connection *con) {
if (con->fd < 0) con->fd = -con->fd;
plugins_call_handle_connection_close(srv, con);
fdevent_event_del(srv->ev, &(con->fde_ndx), con->fd);
fdevent_unregister(srv->ev, con->fd);
#ifdef __WIN32
if (closesocket(con->fd)) {
log_error_write(srv, __FILE__, __LINE__, "sds",
"(warning) close:", con->fd, strerror(errno));
}
#else
if (close(con->fd)) {
log_error_write(srv, __FILE__, __LINE__, "sds",
"(warning) close:", con->fd, strerror(errno));
}
#endif
else {
srv->cur_fds--;
}
if (srv->srvconf.log_state_handling) {
log_error_write(srv, __FILE__, __LINE__, "sd",
"connection closed for fd", con->fd);
}
con->fd = -1;
/* plugins should have cleaned themselves up */
for (size_t i = 0; i < srv->plugins.used; ++i) {
plugin *p = ((plugin **)(srv->plugins.ptr))[i];
plugin_data *pd = p->data;
if (!pd || NULL == con->plugin_ctx[pd->id]) continue;
log_error_write(srv, __FILE__, __LINE__, "sb",
"missing cleanup in", p->name);
con->plugin_ctx[pd->id] = NULL;
}
connection_del(srv, con);
connection_set_state(srv, con, CON_STATE_CONNECT);
return 0;
}
static void connection_read_for_eos(server *srv, connection *con) {
/* we have to do the linger_on_close stuff regardless
* of con->keep_alive; even non-keepalive sockets may
* still have unread data, and closing before reading
* it will make the client not see all our output.
*/
ssize_t len;
const int type = con->dst_addr.plain.sa_family;
char buf[16384];
do {
len = fdevent_socket_read_discard(con->fd, buf, sizeof(buf),
type, SOCK_STREAM);
} while (len > 0 || (len < 0 && errno == EINTR));
if (len < 0 && errno == EAGAIN) return;
#if defined(EWOULDBLOCK) && EWOULDBLOCK != EAGAIN
if (len < 0 && errno == EWOULDBLOCK) return;
#endif
/* 0 == len || (len < 0 && (errno is a non-recoverable error)) */
con->close_timeout_ts = srv->cur_ts - (HTTP_LINGER_TIMEOUT+1);
}
static void connection_handle_close_state(server *srv, connection *con) {
connection_read_for_eos(srv, con);
if (srv->cur_ts - con->close_timeout_ts > HTTP_LINGER_TIMEOUT) {
connection_close(srv, con);
}
}
static void connection_handle_shutdown(server *srv, connection *con) {
plugins_call_handle_connection_shut_wr(srv, con);
srv->con_closed++;
connection_reset(srv, con);
/* close the connection */
if (con->fd >= 0 && 0 == shutdown(con->fd, SHUT_WR)) {
con->close_timeout_ts = srv->cur_ts;
connection_set_state(srv, con, CON_STATE_CLOSE);
if (srv->srvconf.log_state_handling) {
log_error_write(srv, __FILE__, __LINE__, "sd",
"shutdown for fd", con->fd);
}
} else {
connection_close(srv, con);
}
}
static void connection_handle_response_end_state(server *srv, connection *con) {
/* log the request */
/* (even if error, connection dropped, still write to access log if http_status) */
if (con->http_status) {
plugins_call_handle_request_done(srv, con);
}
if (con->state != CON_STATE_ERROR) srv->con_written++;
if (con->request.content_length != con->request_content_queue->bytes_in
|| con->state == CON_STATE_ERROR) {
/* request body is present and has not been read completely */
con->keep_alive = 0;
}
if (con->keep_alive) {
connection_reset(srv, con);
#if 0
con->request_start = srv->cur_ts;
con->read_idle_ts = srv->cur_ts;
#endif
connection_set_state(srv, con, CON_STATE_REQUEST_START);
} else {
connection_handle_shutdown(srv, con);
}
}
static void connection_handle_errdoc_init(server *srv, connection *con) {
/* modules that produce headers required with error response should
* typically also produce an error document. Make an exception for
* mod_auth WWW-Authenticate response header. */
buffer *www_auth = NULL;
if (401 == con->http_status) {
data_string *ds = (data_string *)array_get_element(con->response.headers, "WWW-Authenticate");
if (NULL != ds) {
www_auth = buffer_init_buffer(ds->value);
}
}
con->response.transfer_encoding = 0;
buffer_reset(con->physical.path);
array_reset(con->response.headers);
chunkqueue_reset(con->write_queue);
if (NULL != www_auth) {
response_header_insert(srv, con, CONST_STR_LEN("WWW-Authenticate"), CONST_BUF_LEN(www_auth));
buffer_free(www_auth);
}
}
static int connection_handle_write_prepare(server *srv, connection *con) {
if (con->mode == DIRECT) {
/* static files */
switch(con->request.http_method) {
case HTTP_METHOD_GET:
case HTTP_METHOD_POST:
case HTTP_METHOD_HEAD:
break;
case HTTP_METHOD_OPTIONS:
/*
* 400 is coming from the request-parser BEFORE uri.path is set
* 403 is from the response handler when noone else catched it
*
* */
if ((!con->http_status || con->http_status == 200) && !buffer_string_is_empty(con->uri.path) &&
con->uri.path->ptr[0] != '*') {
response_header_insert(srv, con, CONST_STR_LEN("Allow"), CONST_STR_LEN("OPTIONS, GET, HEAD, POST"));
con->response.transfer_encoding &= ~HTTP_TRANSFER_ENCODING_CHUNKED;
con->parsed_response &= ~HTTP_CONTENT_LENGTH;
con->http_status = 200;
con->file_finished = 1;
chunkqueue_reset(con->write_queue);
}
break;
default:
if (0 == con->http_status) {
con->http_status = 501;
}
break;
}
}
if (con->http_status == 0) {
con->http_status = 403;
}
switch(con->http_status) {
case 204: /* class: header only */
case 205:
case 304:
/* disable chunked encoding again as we have no body */
con->response.transfer_encoding &= ~HTTP_TRANSFER_ENCODING_CHUNKED;
con->parsed_response &= ~HTTP_CONTENT_LENGTH;
chunkqueue_reset(con->write_queue);
con->file_finished = 1;
break;
default: /* class: header + body */
/* only custom body for 4xx and 5xx */
if (con->http_status < 400 || con->http_status >= 600) break;
if (con->mode != DIRECT && (!con->conf.error_intercept || con->error_handler_saved_status)) break;
con->file_finished = 0;
connection_handle_errdoc_init(srv, con);
/* try to send static errorfile */
if (!buffer_string_is_empty(con->conf.errorfile_prefix)) {
stat_cache_entry *sce = NULL;
buffer_copy_buffer(con->physical.path, con->conf.errorfile_prefix);
buffer_append_int(con->physical.path, con->http_status);
buffer_append_string_len(con->physical.path, CONST_STR_LEN(".html"));
if (0 == http_chunk_append_file(srv, con, con->physical.path)) {
con->file_finished = 1;
if (HANDLER_ERROR != stat_cache_get_entry(srv, con, con->physical.path, &sce)) {
stat_cache_content_type_get(srv, con, con->physical.path, sce);
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(sce->content_type));
}
}
}
if (!con->file_finished) {
buffer *b;
buffer_reset(con->physical.path);
con->file_finished = 1;
b = buffer_init();
/* build default error-page */
buffer_copy_string_len(b, CONST_STR_LEN(
"<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>\n"
"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\"\n"
" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n"
"<html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"en\" lang=\"en\">\n"
" <head>\n"
" <title>"));
buffer_append_int(b, con->http_status);
buffer_append_string_len(b, CONST_STR_LEN(" - "));
buffer_append_string(b, get_http_status_name(con->http_status));
buffer_append_string_len(b, CONST_STR_LEN(
"</title>\n"
" </head>\n"
" <body>\n"
" <h1>"));
buffer_append_int(b, con->http_status);
buffer_append_string_len(b, CONST_STR_LEN(" - "));
buffer_append_string(b, get_http_status_name(con->http_status));
buffer_append_string_len(b, CONST_STR_LEN("</h1>\n"
" </body>\n"
"</html>\n"
));
(void)http_chunk_append_buffer(srv, con, b);
buffer_free(b);
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_STR_LEN("text/html"));
}
break;
}
/* Allow filter plugins to change response headers before they are written. */
switch(plugins_call_handle_response_start(srv, con)) {
case HANDLER_GO_ON:
case HANDLER_FINISHED:
break;
default:
log_error_write(srv, __FILE__, __LINE__, "s", "response_start plugin failed");
return -1;
}
if (con->file_finished) {
/* we have all the content and chunked encoding is not used, set a content-length */
if (!(con->parsed_response & (HTTP_CONTENT_LENGTH|HTTP_TRANSFER_ENCODING))) {
off_t qlen = chunkqueue_length(con->write_queue);
/**
* The Content-Length header only can be sent if we have content:
* - HEAD doesn't have a content-body (but have a content-length)
* - 1xx, 204 and 304 don't have a content-body (RFC 2616 Section 4.3)
*
* Otherwise generate a Content-Length header as chunked encoding is not
* available
*/
if ((con->http_status >= 100 && con->http_status < 200) ||
con->http_status == 204 ||
con->http_status == 304) {
data_string *ds;
/* no Content-Body, no Content-Length */
if (NULL != (ds = (data_string*) array_get_element(con->response.headers, "Content-Length"))) {
buffer_reset(ds->value); /* Headers with empty values are ignored for output */
}
} else if (qlen > 0 || con->request.http_method != HTTP_METHOD_HEAD) {
/* qlen = 0 is important for Redirects (301, ...) as they MAY have
* a content. Browsers are waiting for a Content otherwise
*/
buffer_copy_int(srv->tmp_buf, qlen);
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Length"), CONST_BUF_LEN(srv->tmp_buf));
}
}
} else {
/**
* the file isn't finished yet, but we have all headers
*
* to get keep-alive we either need:
* - Content-Length: ... (HTTP/1.0 and HTTP/1.0) or
* - Transfer-Encoding: chunked (HTTP/1.1)
* - Upgrade: ... (lighttpd then acts as transparent proxy)
*/
if (!(con->parsed_response & (HTTP_CONTENT_LENGTH|HTTP_TRANSFER_ENCODING|HTTP_UPGRADE))) {
if (con->request.http_method == HTTP_METHOD_CONNECT
&& con->http_status == 200) {
/*(no transfer-encoding if successful CONNECT)*/
} else if (con->request.http_version == HTTP_VERSION_1_1) {
off_t qlen = chunkqueue_length(con->write_queue);
con->response.transfer_encoding = HTTP_TRANSFER_ENCODING_CHUNKED;
if (qlen) {
/* create initial Transfer-Encoding: chunked segment */
buffer *b = srv->tmp_chunk_len;
buffer_string_set_length(b, 0);
buffer_append_uint_hex(b, (uintmax_t)qlen);
buffer_append_string_len(b, CONST_STR_LEN("\r\n"));
chunkqueue_prepend_buffer(con->write_queue, b);
chunkqueue_append_mem(con->write_queue, CONST_STR_LEN("\r\n"));
}
response_header_append(srv, con, CONST_STR_LEN("Transfer-Encoding"), CONST_STR_LEN("chunked"));
} else {
con->keep_alive = 0;
}
}
/**
* if the backend sent a Connection: close, follow the wish
*
* NOTE: if the backend sent Connection: Keep-Alive, but no Content-Length, we
* will close the connection. That's fine. We can always decide the close
* the connection
*
* FIXME: to be nice we should remove the Connection: ...
*/
if (con->parsed_response & HTTP_CONNECTION) {
/* a subrequest disable keep-alive although the client wanted it */
if (con->keep_alive && !con->response.keep_alive) {
con->keep_alive = 0;
}
}
}
if (con->request.http_method == HTTP_METHOD_HEAD) {
/**
* a HEAD request has the same as a GET
* without the content
*/
con->file_finished = 1;
chunkqueue_reset(con->write_queue);
con->response.transfer_encoding &= ~HTTP_TRANSFER_ENCODING_CHUNKED;
if (con->parsed_response & HTTP_TRANSFER_ENCODING) {
data_string *ds;
if (NULL != (ds = (data_string*) array_get_element(con->response.headers, "Transfer-Encoding"))) {
buffer_reset(ds->value); /* Headers with empty values are ignored for output */
}
}
}
http_response_write_header(srv, con);
return 0;
}
static int connection_handle_write(server *srv, connection *con) {
switch(connection_write_chunkqueue(srv, con, con->write_queue, MAX_WRITE_LIMIT)) {
case 0:
con->write_request_ts = srv->cur_ts;
if (con->file_finished) {
connection_set_state(srv, con, CON_STATE_RESPONSE_END);
}
break;
case -1: /* error on our side */
log_error_write(srv, __FILE__, __LINE__, "sd",
"connection closed: write failed on fd", con->fd);
connection_set_state(srv, con, CON_STATE_ERROR);
break;
case -2: /* remote close */
connection_set_state(srv, con, CON_STATE_ERROR);
break;
case 1:
con->write_request_ts = srv->cur_ts;
con->is_writable = 0;
/* not finished yet -> WRITE */
break;
}
return 0;
}
connection *connection_init(server *srv) {
connection *con;
UNUSED(srv);
con = calloc(1, sizeof(*con));
force_assert(NULL != con);
con->fd = 0;
con->ndx = -1;
con->fde_ndx = -1;
con->bytes_written = 0;
con->bytes_read = 0;
con->bytes_header = 0;
con->loops_per_request = 0;
#define CLEAN(x) \
con->x = buffer_init();
CLEAN(request.uri);
CLEAN(request.request_line);
CLEAN(request.request);
CLEAN(request.pathinfo);
CLEAN(request.orig_uri);
CLEAN(uri.scheme);
CLEAN(uri.authority);
CLEAN(uri.path);
CLEAN(uri.path_raw);
CLEAN(uri.query);
CLEAN(physical.doc_root);
CLEAN(physical.path);
CLEAN(physical.basedir);
CLEAN(physical.rel_path);
CLEAN(physical.etag);
CLEAN(parse_request);
CLEAN(server_name);
CLEAN(proto);
CLEAN(dst_addr_buf);
#undef CLEAN
con->write_queue = chunkqueue_init();
con->read_queue = chunkqueue_init();
con->request_content_queue = chunkqueue_init();
con->request.headers = array_init();
con->response.headers = array_init();
con->environment = array_init();
/* init plugin specific connection structures */
con->plugin_ctx = calloc(1, (srv->plugins.used + 1) * sizeof(void *));
force_assert(NULL != con->plugin_ctx);
con->cond_cache = calloc(srv->config_context->used, sizeof(cond_cache_t));
force_assert(NULL != con->cond_cache);
config_setup_connection(srv, con);
return con;
}
void connections_free(server *srv) {
connections *conns = srv->conns;
size_t i;
if (NULL == conns) return;
for (i = 0; i < conns->size; i++) {
connection *con = conns->ptr[i];
connection_reset(srv, con);
chunkqueue_free(con->write_queue);
chunkqueue_free(con->read_queue);
chunkqueue_free(con->request_content_queue);
array_free(con->request.headers);
array_free(con->response.headers);
array_free(con->environment);
#define CLEAN(x) \
buffer_free(con->x);
CLEAN(request.uri);
CLEAN(request.request_line);
CLEAN(request.request);
CLEAN(request.pathinfo);
CLEAN(request.orig_uri);
CLEAN(uri.scheme);
CLEAN(uri.authority);
CLEAN(uri.path);
CLEAN(uri.path_raw);
CLEAN(uri.query);
CLEAN(physical.doc_root);
CLEAN(physical.path);
CLEAN(physical.basedir);
CLEAN(physical.etag);
CLEAN(physical.rel_path);
CLEAN(parse_request);
CLEAN(server_name);
CLEAN(proto);
CLEAN(dst_addr_buf);
#undef CLEAN
free(con->plugin_ctx);
free(con->cond_cache);
free(con);
}
free(conns->ptr);
free(conns);
srv->conns = NULL;
}
int connection_reset(server *srv, connection *con) {
plugins_call_connection_reset(srv, con);
connection_response_reset(srv, con);
con->is_readable = 1;
con->bytes_written = 0;
con->bytes_written_cur_second = 0;
con->bytes_read = 0;
con->bytes_header = 0;
con->loops_per_request = 0;
con->request.http_method = HTTP_METHOD_UNSET;
con->request.http_version = HTTP_VERSION_UNSET;
con->request.http_if_modified_since = NULL;
con->request.http_if_none_match = NULL;
#define CLEAN(x) \
if (con->x) buffer_reset(con->x);
CLEAN(request.uri);
CLEAN(request.request_line);
CLEAN(request.pathinfo);
CLEAN(request.request);
/* CLEAN(request.orig_uri); */
CLEAN(uri.scheme);
/* CLEAN(uri.authority); */
/* CLEAN(uri.path); */
CLEAN(uri.path_raw);
/* CLEAN(uri.query); */
CLEAN(parse_request);
CLEAN(server_name);
/*CLEAN(proto);*//* set to default in connection_accepted() */
#undef CLEAN
#define CLEAN(x) \
if (con->x) con->x->used = 0;
#undef CLEAN
#define CLEAN(x) \
con->request.x = NULL;
CLEAN(http_host);
CLEAN(http_range);
CLEAN(http_content_type);
#undef CLEAN
con->request.content_length = 0;
con->request.te_chunked = 0;
array_reset(con->request.headers);
array_reset(con->environment);
chunkqueue_reset(con->request_content_queue);
/* The cond_cache gets reset in response.c */
/* config_cond_cache_reset(srv, con); */
con->header_len = 0;
con->async_callback = 0;
con->error_handler_saved_status = 0;
/*con->error_handler_saved_method = HTTP_METHOD_UNSET;*/
/*(error_handler_saved_method value is not valid unless error_handler_saved_status is set)*/
config_setup_connection(srv, con);
return 0;
}
/**
* handle all header and content read
*
* we get called by the state-engine and by the fdevent-handler
*/
static int connection_handle_read_state(server *srv, connection *con) {
chunk *c, *last_chunk;
off_t last_offset;
chunkqueue *cq = con->read_queue;
int is_closed = 0; /* the connection got closed, if we don't have a complete header, -> error */
/* when in CON_STATE_READ: about to receive first byte for a request: */
int is_request_start = chunkqueue_is_empty(cq);
if (con->is_readable) {
con->read_idle_ts = srv->cur_ts;
switch(con->network_read(srv, con, con->read_queue, MAX_READ_LIMIT)) {
case -1:
connection_set_state(srv, con, CON_STATE_ERROR);
return -1;
case -2:
is_closed = 1;
break;
default:
break;
}
}
chunkqueue_remove_finished_chunks(cq);
/* we might have got several packets at once
*/
/* update request_start timestamp when first byte of
* next request is received on a keep-alive connection */
if (con->request_count > 1 && is_request_start) {
con->request_start = srv->cur_ts;
if (con->conf.high_precision_timestamps)
log_clock_gettime_realtime(&con->request_start_hp);
}
/* if there is a \r\n\r\n in the chunkqueue
*
* scan the chunk-queue twice
* 1. to find the \r\n\r\n
* 2. to copy the header-packet
*
*/
last_chunk = NULL;
last_offset = 0;
for (c = cq->first; c; c = c->next) {
size_t i;
size_t len = buffer_string_length(c->mem) - c->offset;
const char *b = c->mem->ptr + c->offset;
for (i = 0; i < len; ++i) {
char ch = b[i];
if ('\r' == ch) {
/* chec if \n\r\n follows */
size_t j = i+1;
chunk *cc = c;
const char header_end[] = "\r\n\r\n";
int header_end_match_pos = 1;
for ( ; cc; cc = cc->next, j = 0 ) {
size_t bblen = buffer_string_length(cc->mem) - cc->offset;
const char *bb = cc->mem->ptr + cc->offset;
for ( ; j < bblen; j++) {
ch = bb[j];
if (ch == header_end[header_end_match_pos]) {
header_end_match_pos++;
if (4 == header_end_match_pos) {
last_chunk = cc;
last_offset = j+1;
goto found_header_end;
}
} else {
goto reset_search;
}
}
}
} else if ('\n' == ch) {
/* check if \n follows */
if (i+1 < len) {
if (b[i+1] == '\n') {
last_chunk = c;
last_offset = i+2;
break;
} /* else goto reset_search; */
} else {
for (chunk *cc = c->next; cc; cc = cc->next) {
size_t bblen = buffer_string_length(cc->mem) - cc->offset;
const char *bb = cc->mem->ptr + cc->offset;
if (0 == bblen) continue;
if (bb[0] == '\n') {
last_chunk = cc;
last_offset = 1;
goto found_header_end;
} else {
goto reset_search;
}
}
}
}
reset_search: ;
}
}
found_header_end:
/* found */
if (last_chunk) {
buffer_reset(con->request.request);
for (c = cq->first; c; c = c->next) {
size_t len = buffer_string_length(c->mem) - c->offset;
if (c == last_chunk) {
len = last_offset;
}
buffer_append_string_len(con->request.request, c->mem->ptr + c->offset, len);
c->offset += len;
cq->bytes_out += len;
if (c == last_chunk) break;
}
connection_set_state(srv, con, CON_STATE_REQUEST_END);
} else if (is_closed) {
/* the connection got closed and we didn't got enough data to leave CON_STATE_READ;
* the only way is to leave here */
connection_set_state(srv, con, CON_STATE_ERROR);
}
if ((last_chunk ? buffer_string_length(con->request.request) : (size_t)chunkqueue_length(cq))
> srv->srvconf.max_request_field_size) {
log_error_write(srv, __FILE__, __LINE__, "s", "oversized request-header -> sending Status 431");
con->http_status = 431; /* Request Header Fields Too Large */
con->keep_alive = 0;
connection_set_state(srv, con, CON_STATE_HANDLE_REQUEST);
}
chunkqueue_remove_finished_chunks(cq);
return 0;
}
static handler_t connection_handle_fdevent(server *srv, void *context, int revents) {
connection *con = context;
joblist_append(srv, con);
if (con->srv_socket->is_ssl) {
/* ssl may read and write for both reads and writes */
if (revents & (FDEVENT_IN | FDEVENT_OUT)) {
con->is_readable = 1;
con->is_writable = 1;
}
} else {
if (revents & FDEVENT_IN) {
con->is_readable = 1;
}
if (revents & FDEVENT_OUT) {
con->is_writable = 1;
/* we don't need the event twice */
}
}
if (con->state == CON_STATE_READ) {
connection_handle_read_state(srv, con);
}
if (con->state == CON_STATE_WRITE &&
!chunkqueue_is_empty(con->write_queue) &&
con->is_writable) {
if (-1 == connection_handle_write(srv, con)) {
connection_set_state(srv, con, CON_STATE_ERROR);
log_error_write(srv, __FILE__, __LINE__, "ds",
con->fd,
"handle write failed.");
}
}
if (con->state == CON_STATE_CLOSE) {
/* flush the read buffers */
connection_read_for_eos(srv, con);
}
/* attempt (above) to read data in kernel socket buffers
* prior to handling FDEVENT_HUP and FDEVENT_ERR */
if ((revents & ~(FDEVENT_IN | FDEVENT_OUT)) && con->state != CON_STATE_ERROR) {
if (con->state == CON_STATE_CLOSE) {
con->close_timeout_ts = srv->cur_ts - (HTTP_LINGER_TIMEOUT+1);
} else if (revents & FDEVENT_HUP) {
connection_set_state(srv, con, CON_STATE_ERROR);
} else if (revents & FDEVENT_RDHUP) {
if (sock_addr_get_family(&con->dst_addr) == AF_UNIX) {
/* future: will getpeername() on AF_UNIX properly check if still connected? */
fdevent_event_clr(srv->ev, &con->fde_ndx, con->fd, FDEVENT_RDHUP);
con->keep_alive = 0;
} else if (fdevent_is_tcp_half_closed(con->fd)) {
/* Success of fdevent_is_tcp_half_closed() after FDEVENT_RDHUP indicates TCP FIN received,
* but does not distinguish between client shutdown(fd, SHUT_WR) and client close(fd).
* Remove FDEVENT_RDHUP so that we do not spin on the ready event.
* However, a later TCP RST will not be detected until next write to socket.
* future: might getpeername() to check for TCP RST on half-closed sockets
* (without FDEVENT_RDHUP interest) when checking for write timeouts
* once a second in server.c, though getpeername() on Windows might not indicate this */
fdevent_event_clr(srv->ev, &con->fde_ndx, con->fd, FDEVENT_RDHUP);
con->keep_alive = 0;
} else {
/* Failure of fdevent_is_tcp_half_closed() indicates TCP RST
* (or unable to tell (unsupported OS), though should not
* be setting FDEVENT_RDHUP in that case) */
connection_set_state(srv, con, CON_STATE_ERROR);
}
} else if (revents & FDEVENT_ERR) { /* error, connection reset */
connection_set_state(srv, con, CON_STATE_ERROR);
} else {
log_error_write(srv, __FILE__, __LINE__, "sd",
"connection closed: poll() -> ???", revents);
}
}
return HANDLER_FINISHED;
}
connection *connection_accept(server *srv, server_socket *srv_socket) {
int cnt;
sock_addr cnt_addr;
size_t cnt_len = sizeof(cnt_addr); /*(size_t intentional; not socklen_t)*/
/**
* check if we can still open a new connections
*
* see #1216
*/
if (srv->conns->used >= srv->max_conns) {
return NULL;
}
cnt = fdevent_accept_listenfd(srv_socket->fd, (struct sockaddr *) &cnt_addr, &cnt_len);
if (-1 == cnt) {
switch (errno) {
case EAGAIN:
#if EWOULDBLOCK != EAGAIN
case EWOULDBLOCK:
#endif
case EINTR:
/* we were stopped _before_ we had a connection */
case ECONNABORTED: /* this is a FreeBSD thingy */
/* we were stopped _after_ we had a connection */
break;
case EMFILE:
/* out of fds */
break;
default:
log_error_write(srv, __FILE__, __LINE__, "ssd", "accept failed:", strerror(errno), errno);
}
return NULL;
} else {
if (sock_addr_get_family(&cnt_addr) != AF_UNIX) {
network_accept_tcp_nagle_disable(cnt);
}
return connection_accepted(srv, srv_socket, &cnt_addr, cnt);
}
}
/* 0: everything ok, -1: error, -2: con closed */
static int connection_read_cq(server *srv, connection *con, chunkqueue *cq, off_t max_bytes) {
int len;
char *mem = NULL;
size_t mem_len = 0;
int toread;
force_assert(cq == con->read_queue); /*(code transform assumption; minimize diff)*/
force_assert(max_bytes == MAX_READ_LIMIT); /*(code transform assumption; minimize diff)*/
/* default size for chunks is 4kb; only use bigger chunks if FIONREAD tells
* us more than 4kb is available
* if FIONREAD doesn't signal a big chunk we fill the previous buffer
* if it has >= 1kb free
*/
if (0 != fdevent_ioctl_fionread(con->fd, S_IFSOCK, &toread) || toread <= 4096) {
toread = 4096;
}
else if (toread > MAX_READ_LIMIT) {
toread = MAX_READ_LIMIT;
}
chunkqueue_get_memory(con->read_queue, &mem, &mem_len, 0, toread);
#if defined(__WIN32)
len = recv(con->fd, mem, mem_len, 0);
#else
len = read(con->fd, mem, mem_len);
#endif /* __WIN32 */
chunkqueue_use_memory(con->read_queue, len > 0 ? len : 0);
if (len < 0) {
con->is_readable = 0;
#if defined(__WIN32)
{
int lastError = WSAGetLastError();
switch (lastError) {
case EAGAIN:
return 0;
case EINTR:
/* we have been interrupted before we could read */
con->is_readable = 1;
return 0;
case ECONNRESET:
/* suppress logging for this error, expected for keep-alive */
break;
default:
log_error_write(srv, __FILE__, __LINE__, "sd", "connection closed - recv failed: ", lastError);
break;
}
}
#else /* __WIN32 */
switch (errno) {
case EAGAIN:
return 0;
case EINTR:
/* we have been interrupted before we could read */
con->is_readable = 1;
return 0;
case ECONNRESET:
/* suppress logging for this error, expected for keep-alive */
break;
default:
log_error_write(srv, __FILE__, __LINE__, "ssd", "connection closed - read failed: ", strerror(errno), errno);
break;
}
#endif /* __WIN32 */
connection_set_state(srv, con, CON_STATE_ERROR);
return -1;
} else if (len == 0) {
con->is_readable = 0;
/* the other end close the connection -> KEEP-ALIVE */
/* pipelining */
return -2;
} else if (len != (ssize_t) mem_len) {
/* we got less then expected, wait for the next fd-event */
con->is_readable = 0;
}
con->bytes_read += len;
return 0;
}
static int connection_write_cq(server *srv, connection *con, chunkqueue *cq, off_t max_bytes) {
return srv->network_backend_write(srv, con->fd, cq, max_bytes);
}
connection *connection_accepted(server *srv, server_socket *srv_socket, sock_addr *cnt_addr, int cnt) {
connection *con;
srv->cur_fds++;
/* ok, we have the connection, register it */
#if 0
log_error_write(srv, __FILE__, __LINE__, "sd",
"appected()", cnt);
#endif
srv->con_opened++;
con = connections_get_new_connection(srv);
con->fd = cnt;
con->fde_ndx = -1;
fdevent_register(srv->ev, con->fd, connection_handle_fdevent, con);
con->network_read = connection_read_cq;
con->network_write = connection_write_cq;
connection_set_state(srv, con, CON_STATE_REQUEST_START);
con->connection_start = srv->cur_ts;
con->dst_addr = *cnt_addr;
buffer_copy_string(con->dst_addr_buf, inet_ntop_cache_get_ip(srv, &(con->dst_addr)));
con->srv_socket = srv_socket;
config_cond_cache_reset(srv, con);
con->conditional_is_valid[COMP_SERVER_SOCKET] = 1;
con->conditional_is_valid[COMP_HTTP_REMOTE_IP] = 1;
buffer_copy_string_len(con->proto, CONST_STR_LEN("http"));
if (HANDLER_GO_ON != plugins_call_handle_connection_accept(srv, con)) {
connection_close(srv, con);
return NULL;
}
return con;
}
int connection_state_machine(server *srv, connection *con) {
int done = 0, r;
if (srv->srvconf.log_state_handling) {
log_error_write(srv, __FILE__, __LINE__, "sds",
"state at start",
con->fd,
connection_get_state(con->state));
}
while (done == 0) {
size_t ostate = con->state;
if (srv->srvconf.log_state_handling) {
log_error_write(srv, __FILE__, __LINE__, "sds",
"state for fd", con->fd, connection_get_state(con->state));
}
switch (con->state) {
case CON_STATE_REQUEST_START: /* transient */
con->request_start = srv->cur_ts;
con->read_idle_ts = srv->cur_ts;
if (con->conf.high_precision_timestamps)
log_clock_gettime_realtime(&con->request_start_hp);
con->request_count++;
con->loops_per_request = 0;
connection_set_state(srv, con, CON_STATE_READ);
break;
case CON_STATE_REQUEST_END: /* transient */
buffer_reset(con->uri.authority);
buffer_reset(con->uri.path);
buffer_reset(con->uri.query);
buffer_reset(con->request.orig_uri);
if (http_request_parse(srv, con)) {
/* we have to read some data from the POST request */
connection_set_state(srv, con, CON_STATE_READ_POST);
break;
}
connection_set_state(srv, con, CON_STATE_HANDLE_REQUEST);
break;
case CON_STATE_READ_POST:
case CON_STATE_HANDLE_REQUEST:
/*
* the request is parsed
*
* decided what to do with the request
* -
*
*
*/
switch (r = http_response_prepare(srv, con)) {
case HANDLER_WAIT_FOR_EVENT:
if (!con->file_finished && (!con->file_started || 0 == con->conf.stream_response_body)) {
break; /* come back here */
}
/* response headers received from backend; fall through to start response */
/* fall through */
case HANDLER_FINISHED:
if (con->error_handler_saved_status > 0) {
con->request.http_method = con->error_handler_saved_method;
}
if (con->mode == DIRECT || con->conf.error_intercept) {
if (con->error_handler_saved_status) {
if (con->error_handler_saved_status > 0) {
con->http_status = con->error_handler_saved_status;
} else if (con->http_status == 404 || con->http_status == 403) {
/* error-handler-404 is a 404 */
con->http_status = -con->error_handler_saved_status;
} else {
/* error-handler-404 is back and has generated content */
/* if Status: was set, take it otherwise use 200 */
}
} else if (con->http_status >= 400) {
buffer *error_handler = NULL;
if (!buffer_string_is_empty(con->conf.error_handler)) {
error_handler = con->conf.error_handler;
} else if ((con->http_status == 404 || con->http_status == 403)
&& !buffer_string_is_empty(con->conf.error_handler_404)) {
error_handler = con->conf.error_handler_404;
}
if (error_handler) {
/* call error-handler */
/* set REDIRECT_STATUS to save current HTTP status code
* for access by dynamic handlers
* https://redmine.lighttpd.net/issues/1828 */
data_string *ds;
if (NULL == (ds = (data_string *)array_get_unused_element(con->environment, TYPE_STRING))) {
ds = data_string_init();
}
buffer_copy_string_len(ds->key, CONST_STR_LEN("REDIRECT_STATUS"));
buffer_append_int(ds->value, con->http_status);
array_insert_unique(con->environment, (data_unset *)ds);
if (error_handler == con->conf.error_handler) {
plugins_call_connection_reset(srv, con);
if (con->request.content_length) {
if (con->request.content_length != con->request_content_queue->bytes_in) {
con->keep_alive = 0;
}
con->request.content_length = 0;
chunkqueue_reset(con->request_content_queue);
}
con->is_writable = 1;
con->file_finished = 0;
con->file_started = 0;
con->parsed_response = 0;
con->response.keep_alive = 0;
con->response.content_length = -1;
con->response.transfer_encoding = 0;
con->error_handler_saved_status = con->http_status;
con->error_handler_saved_method = con->request.http_method;
con->request.http_method = HTTP_METHOD_GET;
} else { /*(preserve behavior for server.error-handler-404)*/
con->error_handler_saved_status = -con->http_status; /*(negative to flag old behavior)*/
}
buffer_copy_buffer(con->request.uri, error_handler);
connection_handle_errdoc_init(srv, con);
con->http_status = 0; /*(after connection_handle_errdoc_init())*/
done = -1;
break;
}
}
}
if (con->http_status == 0) con->http_status = 200;
/* we have something to send, go on */
connection_set_state(srv, con, CON_STATE_RESPONSE_START);
break;
case HANDLER_WAIT_FOR_FD:
srv->want_fds++;
fdwaitqueue_append(srv, con);
break;
case HANDLER_COMEBACK:
done = -1;
break;
case HANDLER_ERROR:
/* something went wrong */
connection_set_state(srv, con, CON_STATE_ERROR);
break;
default:
log_error_write(srv, __FILE__, __LINE__, "sdd", "unknown ret-value: ", con->fd, r);
break;
}
if (con->state == CON_STATE_HANDLE_REQUEST && ostate == CON_STATE_READ_POST) {
ostate = CON_STATE_HANDLE_REQUEST;
}
break;
case CON_STATE_RESPONSE_START:
/*
* the decision is done
* - create the HTTP-Response-Header
*
*/
if (-1 == connection_handle_write_prepare(srv, con)) {
connection_set_state(srv, con, CON_STATE_ERROR);
break;
}
connection_set_state(srv, con, CON_STATE_WRITE);
break;
case CON_STATE_RESPONSE_END: /* transient */
case CON_STATE_ERROR: /* transient */
connection_handle_response_end_state(srv, con);
break;
case CON_STATE_CONNECT:
chunkqueue_reset(con->read_queue);
con->request_count = 0;
break;
case CON_STATE_CLOSE:
connection_handle_close_state(srv, con);
break;
case CON_STATE_READ:
connection_handle_read_state(srv, con);
break;
case CON_STATE_WRITE:
do {
/* only try to write if we have something in the queue */
if (!chunkqueue_is_empty(con->write_queue)) {
if (con->is_writable) {
if (-1 == connection_handle_write(srv, con)) {
log_error_write(srv, __FILE__, __LINE__, "ds",
con->fd,
"handle write failed.");
connection_set_state(srv, con, CON_STATE_ERROR);
break;
}
if (con->state != CON_STATE_WRITE) break;
}
} else if (con->file_finished) {
connection_set_state(srv, con, CON_STATE_RESPONSE_END);
break;
}
if (con->mode != DIRECT && !con->file_finished) {
switch(r = plugins_call_handle_subrequest(srv, con)) {
case HANDLER_WAIT_FOR_EVENT:
case HANDLER_FINISHED:
case HANDLER_GO_ON:
break;
case HANDLER_WAIT_FOR_FD:
srv->want_fds++;
fdwaitqueue_append(srv, con);
break;
case HANDLER_COMEBACK:
default:
log_error_write(srv, __FILE__, __LINE__, "sdd", "unexpected subrequest handler ret-value: ", con->fd, r);
/* fall through */
case HANDLER_ERROR:
connection_set_state(srv, con, CON_STATE_ERROR);
break;
}
}
} while (con->state == CON_STATE_WRITE && (!chunkqueue_is_empty(con->write_queue) ? con->is_writable : con->file_finished));
break;
default:
log_error_write(srv, __FILE__, __LINE__, "sdd",
"unknown state:", con->fd, con->state);
break;
}
if (done == -1) {
done = 0;
} else if (ostate == con->state) {
done = 1;
}
}
if (srv->srvconf.log_state_handling) {
log_error_write(srv, __FILE__, __LINE__, "sds",
"state at exit:",
con->fd,
connection_get_state(con->state));
}
r = 0;
switch(con->state) {
case CON_STATE_READ:
r = FDEVENT_IN | FDEVENT_RDHUP;
break;
case CON_STATE_WRITE:
/* request write-fdevent only if we really need it
* - if we have data to write
* - if the socket is not writable yet
*/
if (!chunkqueue_is_empty(con->write_queue) &&
(con->is_writable == 0) &&
(con->traffic_limit_reached == 0)) {
r |= FDEVENT_OUT;
}
/* fall through */
case CON_STATE_READ_POST:
if (con->conf.stream_request_body & FDEVENT_STREAM_REQUEST_POLLIN) {
r |= FDEVENT_IN | FDEVENT_RDHUP;
}
break;
case CON_STATE_CLOSE:
r = FDEVENT_IN;
break;
default:
break;
}
if (con->fd >= 0) {
const int events = fdevent_event_get_interest(srv->ev, con->fd);
if (con->is_readable < 0) {
con->is_readable = 0;
r |= FDEVENT_IN;
}
if (con->is_writable < 0) {
con->is_writable = 0;
r |= FDEVENT_OUT;
}
if (events & FDEVENT_RDHUP) {
r |= FDEVENT_RDHUP;
}
if (r != events) {
/* update timestamps when enabling interest in events */
if ((r & FDEVENT_IN) && !(events & FDEVENT_IN)) {
con->read_idle_ts = srv->cur_ts;
}
if ((r & FDEVENT_OUT) && !(events & FDEVENT_OUT)) {
con->write_request_ts = srv->cur_ts;
}
fdevent_event_set(srv->ev, &con->fde_ndx, con->fd, r);
}
}
return 0;
}