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git01.mediatek.com / haproxy / 9fe7c6376a5f6ff4d16cff105639d3ed3e41c7b1 / . / src / mux_fcgi.c
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/*
* FastCGI mux-demux for connections
*
* Copyright (C) 2019 HAProxy Technologies, Christopher Faulet <cfaulet@haproxy.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <common/cfgparse.h>
#include <common/config.h>
#include <common/fcgi.h>
#include <common/h1.h>
#include <common/htx.h>
#include <common/initcall.h>
#include <common/ist.h>
#include <common/mini-clist.h>
#include <common/net_helper.h>
#include <types/proxy.h>
#include <types/session.h>
#include <proto/connection.h>
#include <proto/fcgi-app.h>
#include <proto/h1_htx.h>
#include <proto/http_htx.h>
#include <proto/log.h>
#include <proto/session.h>
#include <proto/ssl_sock.h>
#include <proto/stream.h>
#include <proto/stream_interface.h>
/* FCGI Connection flags (32 bits) */
#define FCGI_CF_NONE 0x00000000
/* Flags indicating why writing to the mux is blockes */
#define FCGI_CF_MUX_MALLOC 0x00000001 /* mux is blocked on lack connection's mux buffer */
#define FCGI_CF_MUX_MFULL 0x00000002 /* mux is blocked on connection's mux buffer full */
#define FCGI_CF_MUX_BLOCK_ANY 0x00000003 /* mux is blocked on connection's mux buffer full */
/* Flags indicating why writing to the demux is blocked.
* The first two ones directly affect the ability for the mux to receive data
* from the connection. The other ones affect the mux's ability to demux
* received data.
*/
#define FCGI_CF_DEM_DALLOC 0x00000004 /* demux blocked on lack of connection's demux buffer */
#define FCGI_CF_DEM_DFULL 0x00000008 /* demux blocked on connection's demux buffer full */
#define FCGI_CF_DEM_MROOM 0x00000010 /* demux blocked on lack of room in mux buffer */
#define FCGI_CF_DEM_SALLOC 0x00000020 /* demux blocked on lack of stream's rx buffer */
#define FCGI_CF_DEM_SFULL 0x00000040 /* demux blocked on stream request buffer full */
#define FCGI_CF_DEM_TOOMANY 0x00000080 /* demux blocked waiting for some conn_streams to leave */
#define FCGI_CF_DEM_BLOCK_ANY 0x000000F0 /* aggregate of the demux flags above except DALLOC/DFULL */
/* Other flags */
#define FCGI_CF_MPXS_CONNS 0x00000100 /* connection multiplexing is supported */
#define FCGI_CF_ABRTS_SENT 0x00000200 /* a record ABORT was successfully sent to all active streams */
#define FCGI_CF_ABRTS_FAILED 0x00000400 /* failed to abort processing of all streams */
#define FCGI_CF_WAIT_FOR_HS 0x00000800 /* We did check that at least a stream was waiting for handshake */
#define FCGI_CF_KEEP_CONN 0x00001000 /* HAproxy is responsible to close the connection */
#define FCGI_CF_GET_VALUES 0x00002000 /* retrieve settings */
/* FCGI connection state (fcgi_conn->state) */
enum fcgi_conn_st {
FCGI_CS_INIT = 0, /* init done, waiting for sending GET_VALUES record */
FCGI_CS_SETTINGS, /* GET_VALUES sent, waiting for the GET_VALUES_RESULT record */
FCGI_CS_RECORD_H, /* GET_VALUES_RESULT received, waiting for a record header */
FCGI_CS_RECORD_D, /* Record header OK, waiting for a record data */
FCGI_CS_RECORD_P, /* Record processed, remains the padding */
FCGI_CS_CLOSED, /* abort requests if necessary and close the connection ASAP */
FCGI_CS_ENTRIES
} __attribute__((packed));
/* 32 buffers: one for the ring's root, rest for the mbuf itself */
#define FCGI_C_MBUF_CNT 32
/* FCGI connection descriptor */
struct fcgi_conn {
struct connection *conn;
enum fcgi_conn_st state; /* FCGI connection state */
int16_t max_id; /* highest ID known on this connection, <0 before mgmt records */
uint32_t streams_limit; /* maximum number of concurrent streams the peer supports */
uint32_t flags; /* Connection flags: FCGI_CF_* */
int16_t dsi; /* dmux stream ID (<0 = idle ) */
uint16_t drl; /* demux record length (if dsi >= 0) */
uint8_t drt; /* demux record type (if dsi >= 0) */
uint8_t drp; /* demux record padding (if dsi >= 0) */
struct buffer dbuf; /* demux buffer */
struct buffer mbuf[FCGI_C_MBUF_CNT]; /* mux buffers (ring) */
int timeout; /* idle timeout duration in ticks */
int shut_timeout; /* idle timeout duration in ticks after shutdown */
unsigned int nb_streams; /* number of streams in the tree */
unsigned int nb_cs; /* number of attached conn_streams */
unsigned int nb_reserved; /* number of reserved streams */
unsigned int stream_cnt; /* total number of streams seen */
struct proxy *proxy; /* the proxy this connection was created for */
struct fcgi_app *app; /* FCGI application used by this mux */
struct task *task; /* timeout management task */
struct eb_root streams_by_id; /* all active streams by their ID */
struct list send_list; /* list of blocked streams requesting to send */
struct list sending_list; /* list of fcgi_strm scheduled to send data */
struct buffer_wait buf_wait; /* Wait list for buffer allocation */
struct wait_event wait_event; /* To be used if we're waiting for I/Os */
};
/* FCGI stream state, in fcgi_strm->state */
enum fcgi_strm_st {
FCGI_SS_IDLE = 0,
FCGI_SS_OPEN,
FCGI_SS_HREM, // half-closed(remote)
FCGI_SS_HLOC, // half-closed(local)
FCGI_SS_ERROR,
FCGI_SS_CLOSED,
FCGI_SS_ENTRIES
} __attribute__((packed));
/* FCGI stream flags (32 bits) */
#define FCGI_SF_NONE 0x00000000
#define FCGI_SF_ES_RCVD 0x00000001 /* end-of-stream received (empty STDOUT or EDN_REQUEST record) */
#define FCGI_SF_ES_SENT 0x00000002 /* end-of-strem sent (empty STDIN record) */
#define FCGI_SF_ABRT_SENT 0x00000004 /* abort sent (ABORT_REQUEST record) */
/* Stream flags indicating the reason the stream is blocked */
#define FCGI_SF_BLK_MBUSY 0x00000010 /* blocked waiting for mux access (transient) */
#define FCGI_SF_BLK_MROOM 0x00000020 /* blocked waiting for room in the mux */
#define FCGI_SF_BLK_ANY 0x00000030 /* any of the reasons above */
#define FCGI_SF_BEGIN_SENT 0x00000100 /* a BEGIN_REQUEST record was sent for this stream */
#define FCGI_SF_OUTGOING_DATA 0x00000200 /* set whenever we've seen outgoing data */
#define FCGI_SF_WANT_SHUTR 0x00001000 /* a stream couldn't shutr() (mux full/busy) */
#define FCGI_SF_WANT_SHUTW 0x00002000 /* a stream couldn't shutw() (mux full/busy) */
#define FCGI_SF_KILL_CONN 0x00004000 /* kill the whole connection with this stream */
/* Other flags */
#define FCGI_SF_HAVE_I_TLR 0x00010000 /* Set during input process to know the trailers were processed */
/* FCGI stream descriptor */
struct fcgi_strm {
struct conn_stream *cs;
struct session *sess;
struct fcgi_conn *fconn;
int32_t id; /* stream ID */
uint32_t flags; /* Connection flags: FCGI_SF_* */
enum fcgi_strm_st state; /* FCGI stream state */
int proto_status; /* FCGI_PS_* */
struct h1m h1m; /* response parser state for H1 */
struct buffer rxbuf; /* receive buffer, always valid (buf_empty or real buffer) */
struct eb32_node by_id; /* place in fcgi_conn's streams_by_id */
struct wait_event wait_event; /* Wait list, when we're attempting to send an ABORT but we can't send */
struct wait_event *recv_wait; /* Address of the wait_event the conn_stream associated is waiting on */
struct wait_event *send_wait; /* Address of the wait_event the conn_stream associated is waiting on */
struct list send_list; /* To be used when adding in fcgi_conn->send_list */
struct list sending_list; /* To be used when adding in fcgi_conn->sending_list */
};
/* Flags representing all default FCGI parameters */
#define FCGI_SP_CGI_GATEWAY 0x00000001
#define FCGI_SP_DOC_ROOT 0x00000002
#define FCGI_SP_SCRIPT_NAME 0x00000004
#define FCGI_SP_PATH_INFO 0x00000008
#define FCGI_SP_REQ_URI 0x00000010
#define FCGI_SP_REQ_METH 0x00000020
#define FCGI_SP_REQ_QS 0x00000040
#define FCGI_SP_SRV_PORT 0x00000080
#define FCGI_SP_SRV_PROTO 0x00000100
#define FCGI_SP_SRV_NAME 0x00000200
#define FCGI_SP_REM_ADDR 0x00000400
#define FCGI_SP_REM_PORT 0x00000800
#define FCGI_SP_SCRIPT_FILE 0x00001000
#define FCGI_SP_PATH_TRANS 0x00002000
#define FCGI_SP_CONT_LEN 0x00004000
#define FCGI_SP_HTTPS 0x00008000
#define FCGI_SP_MASK 0x0000FFFF
#define FCGI_SP_URI_MASK (FCGI_SP_SCRIPT_NAME|FCGI_SP_PATH_INFO|FCGI_SP_REQ_QS)
/* FCGI parameters used when PARAMS record is sent */
struct fcgi_strm_params {
uint32_t mask;
struct ist docroot;
struct ist scriptname;
struct ist pathinfo;
struct ist meth;
struct ist uri;
struct ist vsn;
struct ist qs;
struct ist srv_name;
struct ist srv_port;
struct ist rem_addr;
struct ist rem_port;
struct ist cont_len;
int https;
struct buffer *p;
};
/* Maximum amount of data we're OK with re-aligning for buffer optimizations */
#define MAX_DATA_REALIGN 1024
/* FCGI connection and stream pools */
DECLARE_STATIC_POOL(pool_head_fcgi_conn, "fcgi_conn", sizeof(struct fcgi_conn));
DECLARE_STATIC_POOL(pool_head_fcgi_strm, "fcgi_strm", sizeof(struct fcgi_strm));
static struct task *fcgi_timeout_task(struct task *t, void *context, unsigned short state);
static int fcgi_process(struct fcgi_conn *fconn);
static struct task *fcgi_io_cb(struct task *t, void *ctx, unsigned short state);
static inline struct fcgi_strm *fcgi_conn_st_by_id(struct fcgi_conn *fconn, int id);
static struct task *fcgi_deferred_shut(struct task *t, void *ctx, unsigned short state);
static struct fcgi_strm *fcgi_conn_stream_new(struct fcgi_conn *fconn, struct conn_stream *cs, struct session *sess);
static void fcgi_strm_alert(struct fcgi_strm *fstrm);
static int fcgi_strm_send_abort(struct fcgi_conn *fconn, struct fcgi_strm *fstrm);
/* a dmumy management stream */
static const struct fcgi_strm *fcgi_mgmt_stream = &(const struct fcgi_strm){
.cs = NULL,
.fconn = NULL,
.state = FCGI_SS_CLOSED,
.flags = FCGI_SF_NONE,
.id = 0,
};
/* and a dummy idle stream for use with any unknown stream */
static const struct fcgi_strm *fcgi_unknown_stream = &(const struct fcgi_strm){
.cs = NULL,
.fconn = NULL,
.state = FCGI_SS_IDLE,
.flags = FCGI_SF_NONE,
.id = 0,
};
/*****************************************************/
/* functions below are for dynamic buffer management */
/*****************************************************/
/* Indicates whether or not the we may call the fcgi_recv() function to attempt
* to receive data into the buffer and/or demux pending data. The condition is
* a bit complex due to some API limits for now. The rules are the following :
* - if an error or a shutdown was detected on the connection and the buffer
* is empty, we must not attempt to receive
* - if the demux buf failed to be allocated, we must not try to receive and
* we know there is nothing pending
* - if no flag indicates a blocking condition, we may attempt to receive,
* regardless of whether the demux buffer is full or not, so that only
* de demux part decides whether or not to block. This is needed because
* the connection API indeed prevents us from re-enabling receipt that is
* already enabled in a polled state, so we must always immediately stop
* as soon as the demux can't proceed so as never to hit an end of read
* with data pending in the buffers.
* - otherwise must may not attempt
*/
static inline int fcgi_recv_allowed(const struct fcgi_conn *fconn)
{
if (b_data(&fconn->dbuf) == 0 &&
(fconn->state == FCGI_CS_CLOSED ||
fconn->conn->flags & CO_FL_ERROR ||
conn_xprt_read0_pending(fconn->conn)))
return 0;
if (!(fconn->flags & FCGI_CF_DEM_DALLOC) &&
!(fconn->flags & FCGI_CF_DEM_BLOCK_ANY))
return 1;
return 0;
}
/* Restarts reading on the connection if it was not enabled */
static inline void fcgi_conn_restart_reading(const struct fcgi_conn *fconn, int consider_buffer)
{
if (!fcgi_recv_allowed(fconn))
return;
if ((!consider_buffer || !b_data(&fconn->dbuf)) &&
(fconn->wait_event.events & SUB_RETRY_RECV))
return;
tasklet_wakeup(fconn->wait_event.tasklet);
}
/* Tries to grab a buffer and to re-enable processing on mux <target>. The
* fcgi_conn flags are used to figure what buffer was requested. It returns 1 if
* the allocation succeeds, in which case the connection is woken up, or 0 if
* it's impossible to wake up and we prefer to be woken up later.
*/
static int fcgi_buf_available(void *target)
{
struct fcgi_conn *fconn = target;
struct fcgi_strm *fstrm;
if ((fconn->flags & FCGI_CF_DEM_DALLOC) && b_alloc_margin(&fconn->dbuf, 0)) {
fconn->flags &= ~FCGI_CF_DEM_DALLOC;
fcgi_conn_restart_reading(fconn, 1);
return 1;
}
if ((fconn->flags & FCGI_CF_MUX_MALLOC) && b_alloc_margin(br_tail(fconn->mbuf), 0)) {
fconn->flags &= ~FCGI_CF_MUX_MALLOC;
if (fconn->flags & FCGI_CF_DEM_MROOM) {
fconn->flags &= ~FCGI_CF_DEM_MROOM;
fcgi_conn_restart_reading(fconn, 1);
}
return 1;
}
if ((fconn->flags & FCGI_CF_DEM_SALLOC) &&
(fstrm = fcgi_conn_st_by_id(fconn, fconn->dsi)) && fstrm->cs &&
b_alloc_margin(&fstrm->rxbuf, 0)) {
fconn->flags &= ~FCGI_CF_DEM_SALLOC;
fcgi_conn_restart_reading(fconn, 1);
return 1;
}
return 0;
}
static inline struct buffer *fcgi_get_buf(struct fcgi_conn *fconn, struct buffer *bptr)
{
struct buffer *buf = NULL;
if (likely(!LIST_ADDED(&fconn->buf_wait.list)) &&
unlikely((buf = b_alloc_margin(bptr, 0)) == NULL)) {
fconn->buf_wait.target = fconn;
fconn->buf_wait.wakeup_cb = fcgi_buf_available;
HA_SPIN_LOCK(BUF_WQ_LOCK, &buffer_wq_lock);
LIST_ADDQ(&buffer_wq, &fconn->buf_wait.list);
HA_SPIN_UNLOCK(BUF_WQ_LOCK, &buffer_wq_lock);
__conn_xprt_stop_recv(fconn->conn);
}
return buf;
}
static inline void fcgi_release_buf(struct fcgi_conn *fconn, struct buffer *bptr)
{
if (bptr->size) {
b_free(bptr);
offer_buffers(NULL, tasks_run_queue);
}
}
static inline void fcgi_release_mbuf(struct fcgi_conn *fconn)
{
struct buffer *buf;
unsigned int count = 0;
while (b_size(buf = br_head_pick(fconn->mbuf))) {
b_free(buf);
count++;
}
if (count)
offer_buffers(NULL, tasks_run_queue);
}
/* Returns the number of allocatable outgoing streams for the connection taking
* the number reserved streams into account.
*/
static inline int fcgi_streams_left(const struct fcgi_conn *fconn)
{
int ret;
ret = (unsigned int)(0x7FFF - fconn->max_id) - fconn->nb_reserved - 1;
if (ret < 0)
ret = 0;
return ret;
}
/* Returns the number of streams in use on a connection to figure if it's
* idle or not. We check nb_cs and not nb_streams as the caller will want
* to know if it was the last one after a detach().
*/
static int fcgi_used_streams(struct connection *conn)
{
struct fcgi_conn *fconn = conn->ctx;
return fconn->nb_cs;
}
/* Returns the number of concurrent streams available on the connection */
static int fcgi_avail_streams(struct connection *conn)
{
struct server *srv = objt_server(conn->target);
struct fcgi_conn *fconn = conn->ctx;
int ret1, ret2;
/* Don't open new stream if the connection is closed */
if (fconn->state == FCGI_CS_CLOSED)
return 0;
/* May be negative if this setting has changed */
ret1 = (fconn->streams_limit - fconn->nb_streams);
/* we must also consider the limit imposed by stream IDs */
ret2 = fcgi_streams_left(fconn);
ret1 = MIN(ret1, ret2);
if (ret1 > 0 && srv && srv->max_reuse >= 0) {
ret2 = ((fconn->stream_cnt <= srv->max_reuse) ? srv->max_reuse - fconn->stream_cnt + 1: 0);
ret1 = MIN(ret1, ret2);
}
return ret1;
}
/*****************************************************************/
/* functions below are dedicated to the mux setup and management */
/*****************************************************************/
/* Initializes the mux once it's attached. Only outgoing connections are
* supported. So the context is already initialized before installing the
* mux. <input> is always used as Input buffer and may contain data. It is the
* caller responsibility to not reuse it anymore. Returns < 0 on error.
*/
static int fcgi_init(struct connection *conn, struct proxy *px, struct session *sess,
struct buffer *input)
{
struct fcgi_conn *fconn;
struct fcgi_strm *fstrm;
struct fcgi_app *app = get_px_fcgi_app(px);
struct task *t = NULL;
if (!app)
goto fail_conn;
fconn = pool_alloc(pool_head_fcgi_conn);
if (!fconn)
goto fail_conn;
fconn->shut_timeout = fconn->timeout = px->timeout.server;
if (tick_isset(px->timeout.serverfin))
fconn->shut_timeout = px->timeout.serverfin;
fconn->flags = FCGI_CF_NONE;
/* Retrieve usefull info from the FCGI app */
if (app->flags & FCGI_APP_FL_KEEP_CONN)
fconn->flags |= FCGI_CF_KEEP_CONN;
if (app->flags & FCGI_APP_FL_GET_VALUES)
fconn->flags |= FCGI_CF_GET_VALUES;
if (app->flags & FCGI_APP_FL_MPXS_CONNS)
fconn->flags |= FCGI_CF_MPXS_CONNS;
fconn->proxy = px;
fconn->app = app;
fconn->task = NULL;
if (tick_isset(fconn->timeout)) {
t = task_new(tid_bit);
if (!t)
goto fail;
fconn->task = t;
t->process = fcgi_timeout_task;
t->context = fconn;
t->expire = tick_add(now_ms, fconn->timeout);
}
fconn->wait_event.tasklet = tasklet_new();
if (!fconn->wait_event.tasklet)
goto fail;
fconn->wait_event.tasklet->process = fcgi_io_cb;
fconn->wait_event.tasklet->context = fconn;
fconn->wait_event.events = 0;
/* Initialise the context. */
fconn->state = FCGI_CS_INIT;
fconn->conn = conn;
fconn->streams_limit = app->maxreqs;
fconn->max_id = -1;
fconn->nb_streams = 0;
fconn->nb_cs = 0;
fconn->nb_reserved = 0;
fconn->stream_cnt = 0;
fconn->dbuf = *input;
fconn->dsi = -1;
br_init(fconn->mbuf, sizeof(fconn->mbuf) / sizeof(fconn->mbuf[0]));
fconn->streams_by_id = EB_ROOT;
LIST_INIT(&fconn->send_list);
LIST_INIT(&fconn->sending_list);
LIST_INIT(&fconn->buf_wait.list);
if (t)
task_queue(t);
/* FIXME: this is temporary, for outgoing connections we need to
* immediately allocate a stream until the code is modified so that the
* caller calls ->attach(). For now the outgoing cs is stored as
* conn->ctx by the caller.
*/
fstrm = fcgi_conn_stream_new(fconn, conn->ctx, sess);
if (!fstrm)
goto fail;
conn->ctx = fconn;
/* Repare to read something */
fcgi_conn_restart_reading(fconn, 1);
return 0;
fail:
task_destroy(t);
if (fconn->wait_event.tasklet)
tasklet_free(fconn->wait_event.tasklet);
pool_free(pool_head_fcgi_conn, fconn);
fail_conn:
return -1;
}
/* Returns the next allocatable outgoing stream ID for the FCGI connection, or
* -1 if no more is allocatable.
*/
static inline int32_t fcgi_conn_get_next_sid(const struct fcgi_conn *fconn)
{
int32_t id = (fconn->max_id + 1) | 1;
if ((id & 0x80000000U))
id = -1;
return id;
}
/* Returns the stream associated with id <id> or NULL if not found */
static inline struct fcgi_strm *fcgi_conn_st_by_id(struct fcgi_conn *fconn, int id)
{
struct eb32_node *node;
if (id == 0)
return (struct fcgi_strm *)fcgi_mgmt_stream;
if (id > fconn->max_id)
return (struct fcgi_strm *)fcgi_unknown_stream;
node = eb32_lookup(&fconn->streams_by_id, id);
if (!node)
return (struct fcgi_strm *)fcgi_unknown_stream;
return container_of(node, struct fcgi_strm, by_id);
}
/* Release function. This one should be called to free all resources allocated
* to the mux.
*/
static void fcgi_release(struct fcgi_conn *fconn)
{
struct connection *conn = NULL;;
if (fconn) {
/* The connection must be attached to this mux to be released */
if (fconn->conn && fconn->conn->ctx == fconn)
conn = fconn->conn;
if (LIST_ADDED(&fconn->buf_wait.list)) {
HA_SPIN_LOCK(BUF_WQ_LOCK, &buffer_wq_lock);
LIST_DEL(&fconn->buf_wait.list);
HA_SPIN_UNLOCK(BUF_WQ_LOCK, &buffer_wq_lock);
}
fcgi_release_buf(fconn, &fconn->dbuf);
fcgi_release_mbuf(fconn);
if (fconn->task) {
fconn->task->context = NULL;
task_wakeup(fconn->task, TASK_WOKEN_OTHER);
fconn->task = NULL;
}
if (fconn->wait_event.tasklet)
tasklet_free(fconn->wait_event.tasklet);
if (conn && fconn->wait_event.events != 0)
conn->xprt->unsubscribe(conn, conn->xprt_ctx, fconn->wait_event.events,
&fconn->wait_event);
}
if (conn) {
conn->mux = NULL;
conn->ctx = NULL;
conn_stop_tracking(conn);
conn_full_close(conn);
if (conn->destroy_cb)
conn->destroy_cb(conn);
conn_free(conn);
}
}
/* Retruns true if the FCGI connection must be release */
static inline int fcgi_conn_is_dead(struct fcgi_conn *fconn)
{
if (eb_is_empty(&fconn->streams_by_id) && /* don't close if streams exist */
(!(fconn->flags & FCGI_CF_KEEP_CONN) || /* don't keep the connection alive */
(fconn->conn->flags & CO_FL_ERROR) || /* errors close immediately */
(fconn->state == FCGI_CS_CLOSED && !fconn->task) ||/* a timeout stroke earlier */
(!(fconn->conn->owner)) || /* Nobody's left to take care of the connection, drop it now */
(!br_data(fconn->mbuf) && /* mux buffer empty, also process clean events below */
conn_xprt_read0_pending(fconn->conn))))
return 1;
return 0;
}
/********************************************************/
/* functions below are for the FCGI protocol processing */
/********************************************************/
/* Marks an error on the stream. */
static inline void fcgi_strm_error(struct fcgi_strm *fstrm)
{
if (fstrm->id && fstrm->state != FCGI_SS_ERROR) {
if (fstrm->state < FCGI_SS_ERROR)
fstrm->state = FCGI_SS_ERROR;
if (fstrm->cs)
cs_set_error(fstrm->cs);
}
}
/* Attempts to notify the data layer of recv availability */
static void fcgi_strm_notify_recv(struct fcgi_strm *fstrm)
{
struct wait_event *sw;
if (fstrm->recv_wait) {
sw = fstrm->recv_wait;
sw->events &= ~SUB_RETRY_RECV;
tasklet_wakeup(sw->tasklet);
fstrm->recv_wait = NULL;
}
}
/* Attempts to notify the data layer of send availability */
static void fcgi_strm_notify_send(struct fcgi_strm *fstrm)
{
struct wait_event *sw;
if (fstrm->send_wait && !LIST_ADDED(&fstrm->sending_list)) {
sw = fstrm->send_wait;
sw->events &= ~SUB_RETRY_SEND;
LIST_ADDQ(&fstrm->fconn->sending_list, &fstrm->sending_list);
tasklet_wakeup(sw->tasklet);
}
}
/* Alerts the data layer, trying to wake it up by all means, following
* this sequence :
* - if the fcgi stream' data layer is subscribed to recv, then it's woken up
* for recv
* - if its subscribed to send, then it's woken up for send
* - if it was subscribed to neither, its ->wake() callback is called
* It is safe to call this function with a closed stream which doesn't have a
* conn_stream anymore.
*/
static void fcgi_strm_alert(struct fcgi_strm *fstrm)
{
if (fstrm->recv_wait || fstrm->send_wait) {
fcgi_strm_notify_recv(fstrm);
fcgi_strm_notify_send(fstrm);
}
else if (fstrm->cs && fstrm->cs->data_cb->wake != NULL)
fstrm->cs->data_cb->wake(fstrm->cs);
}
/* Writes the 16-bit record size <len> at address <record> */
static inline void fcgi_set_record_size(void *record, uint16_t len)
{
uint8_t *out = (record + 4);
*out = (len >> 8);
*(out + 1) = (len & 0xff);
}
/* Writes the 16-bit stream id <id> at address <record> */
static inline void fcgi_set_record_id(void *record, uint16_t id)
{
uint8_t *out = (record + 2);
*out = (id >> 8);
*(out + 1) = (id & 0xff);
}
/* Marks a FCGI stream as CLOSED and decrement the number of active streams for
* its connection if the stream was not yet closed. Please use this exclusively
* before closing a stream to ensure stream count is well maintained.
*/
static inline void fcgi_strm_close(struct fcgi_strm *fstrm)
{
if (fstrm->state != FCGI_SS_CLOSED) {
fstrm->fconn->nb_streams--;
if (!fstrm->id)
fstrm->fconn->nb_reserved--;
if (fstrm->cs) {
if (!(fstrm->cs->flags & CS_FL_EOS) && !b_data(&fstrm->rxbuf))
fcgi_strm_notify_recv(fstrm);
}
}
fstrm->state = FCGI_SS_CLOSED;
}
/* Detaches a FCGI stream from its FCGI connection and releases it to the
* fcgi_strm pool.
*/
static void fcgi_strm_destroy(struct fcgi_strm *fstrm)
{
fcgi_strm_close(fstrm);
eb32_delete(&fstrm->by_id);
if (b_size(&fstrm->rxbuf)) {
b_free(&fstrm->rxbuf);
offer_buffers(NULL, tasks_run_queue);
}
if (fstrm->send_wait != NULL)
fstrm->send_wait->events &= ~SUB_RETRY_SEND;
if (fstrm->recv_wait != NULL)
fstrm->recv_wait->events &= ~SUB_RETRY_RECV;
/* There's no need to explicitly call unsubscribe here, the only
* reference left would be in the fconn send_list/fctl_list, and if
* we're in it, we're getting out anyway
*/
LIST_DEL_INIT(&fstrm->send_list);
if (LIST_ADDED(&fstrm->sending_list)) {
tasklet_remove_from_tasklet_list(fstrm->send_wait->tasklet);
LIST_DEL_INIT(&fstrm->sending_list);
}
tasklet_free(fstrm->wait_event.tasklet);
pool_free(pool_head_fcgi_strm, fstrm);
}
/* Allocates a new stream <id> for connection <fconn> and adds it into fconn's
* stream tree. In case of error, nothing is added and NULL is returned. The
* causes of errors can be any failed memory allocation. The caller is
* responsible for checking if the connection may support an extra stream prior
* to calling this function.
*/
static struct fcgi_strm *fcgi_strm_new(struct fcgi_conn *fconn, int id)
{
struct fcgi_strm *fstrm;
fstrm = pool_alloc(pool_head_fcgi_strm);
if (!fstrm)
goto out;
fstrm->wait_event.tasklet = tasklet_new();
if (!fstrm->wait_event.tasklet) {
pool_free(pool_head_fcgi_strm, fstrm);
goto out;
}
fstrm->send_wait = NULL;
fstrm->recv_wait = NULL;
fstrm->wait_event.tasklet->process = fcgi_deferred_shut;
fstrm->wait_event.tasklet->context = fstrm;
fstrm->wait_event.events = 0;
LIST_INIT(&fstrm->send_list);
LIST_INIT(&fstrm->sending_list);
fstrm->fconn = fconn;
fstrm->cs = NULL;
fstrm->flags = FCGI_SF_NONE;
fstrm->proto_status = 0;
fstrm->state = FCGI_SS_IDLE;
fstrm->rxbuf = BUF_NULL;
h1m_init_res(&fstrm->h1m);
fstrm->h1m.err_pos = -1; // don't care about errors on the request path
fstrm->h1m.flags |= (H1_MF_NO_PHDR|H1_MF_CLEAN_CONN_HDR);
fstrm->by_id.key = fstrm->id = id;
if (id > 0)
fconn->max_id = id;
else
fconn->nb_reserved++;
eb32_insert(&fconn->streams_by_id, &fstrm->by_id);
fconn->nb_streams++;
fconn->stream_cnt++;
return fstrm;
out:
return NULL;
}
/* Allocates a new stream associated to conn_stream <cs> on the FCGI connection
* <fconn> and returns it, or NULL in case of memory allocation error or if the
* highest possible stream ID was reached.
*/
static struct fcgi_strm *fcgi_conn_stream_new(struct fcgi_conn *fconn, struct conn_stream *cs,
struct session *sess)
{
struct fcgi_strm *fstrm = NULL;
if (fconn->nb_streams >= fconn->streams_limit)
goto out;
if (fcgi_streams_left(fconn) < 1)
goto out;
/* Defer choosing the ID until we send the first message to create the stream */
fstrm = fcgi_strm_new(fconn, 0);
if (!fstrm)
goto out;
fstrm->cs = cs;
fstrm->sess = sess;
cs->ctx = fstrm;
fconn->nb_cs++;
out:
return fstrm;
}
/* Wakes a specific stream and assign its conn_stream some CS_FL_* flags among
* CS_FL_ERR_PENDING and CS_FL_ERROR if needed. The stream's state is
* automatically updated accordingly. If the stream is orphaned, it is
* destroyed.
*/
static void fcgi_strm_wake_one_stream(struct fcgi_strm *fstrm)
{
if (!fstrm->cs) {
/* this stream was already orphaned */
fcgi_strm_destroy(fstrm);
return;
}
if (conn_xprt_read0_pending(fstrm->fconn->conn)) {
if (fstrm->state == FCGI_SS_OPEN)
fstrm->state = FCGI_SS_HREM;
else if (fstrm->state == FCGI_SS_HLOC)
fcgi_strm_close(fstrm);
}
if ((fstrm->fconn->state == FCGI_CS_CLOSED || fstrm->fconn->conn->flags & CO_FL_ERROR)) {
fstrm->cs->flags |= CS_FL_ERR_PENDING;
if (fstrm->cs->flags & CS_FL_EOS)
fstrm->cs->flags |= CS_FL_ERROR;
if (fstrm->state < FCGI_SS_ERROR)
fstrm->state = FCGI_SS_ERROR;
}
fcgi_strm_alert(fstrm);
}
/* Wakes unassigned streams (ID == 0) attached to the connection. */
static void fcgi_wake_unassigned_streams(struct fcgi_conn *fconn)
{
struct eb32_node *node;
struct fcgi_strm *fstrm;
node = eb32_lookup(&fconn->streams_by_id, 0);
while (node) {
fstrm = container_of(node, struct fcgi_strm, by_id);
if (fstrm->id > 0)
break;
node = eb32_next(node);
fcgi_strm_wake_one_stream(fstrm);
}
}
/* Wakes the streams attached to the connection, whose id is greater than <last>
* or unassigned.
*/
static void fcgi_wake_some_streams(struct fcgi_conn *fconn, int last)
{
struct eb32_node *node;
struct fcgi_strm *fstrm;
/* Wake all streams with ID > last */
node = eb32_lookup_ge(&fconn->streams_by_id, last + 1);
while (node) {
fstrm = container_of(node, struct fcgi_strm, by_id);
node = eb32_next(node);
fcgi_strm_wake_one_stream(fstrm);
}
fcgi_wake_unassigned_streams(fconn);
}
static int fcgi_set_default_param(struct fcgi_conn *fconn, struct fcgi_strm *fstrm,
struct htx *htx, struct htx_sl *sl,
struct fcgi_strm_params *params)
{
struct connection *cli_conn = objt_conn(fstrm->sess->origin);
struct ist p;
if (!sl)
goto error;
if (!(params->mask & FCGI_SP_DOC_ROOT))
params->docroot = fconn->app->docroot;
if (!(params->mask & FCGI_SP_REQ_METH)) {
p = htx_sl_req_meth(sl);
params->meth = ist2(b_tail(params->p), p.len);
chunk_memcat(params->p, p.ptr, p.len);
}
if (!(params->mask & FCGI_SP_REQ_URI)) {
p = htx_sl_req_uri(sl);
params->uri = ist2(b_tail(params->p), p.len);
chunk_memcat(params->p, p.ptr, p.len);
}
if (!(params->mask & FCGI_SP_SRV_PROTO)) {
p = htx_sl_req_vsn(sl);
params->vsn = ist2(b_tail(params->p), p.len);
chunk_memcat(params->p, p.ptr, p.len);
}
if (!(params->mask & FCGI_SP_SRV_PORT)) {
char *end;
int port = 0;
if (conn_get_dst(cli_conn))
port = get_host_port(cli_conn->dst);
end = ultoa_o(port, b_tail(params->p), b_room(params->p));
if (!end)
goto error;
params->srv_port = ist2(b_tail(params->p), end - b_tail(params->p));
params->p->data += params->srv_port.len;
}
if (!(params->mask & FCGI_SP_SRV_NAME)) {
/* If no Host header found, use the server address to fill
* srv_name */
if (!istlen(params->srv_name)) {
char *ptr = NULL;
if (conn_get_dst(cli_conn))
if (addr_to_str(cli_conn->dst, b_tail(params->p), b_room(params->p)) != -1)
ptr = b_tail(params->p);
if (ptr) {
params->srv_name = ist2(ptr, strlen(ptr));
params->p->data += params->srv_name.len;
}
}
}
if (!(params->mask & FCGI_SP_REM_ADDR)) {
char *ptr = NULL;
if (conn_get_src(cli_conn))
if (addr_to_str(cli_conn->src, b_tail(params->p), b_room(params->p)) != -1)
ptr = b_tail(params->p);
if (ptr) {
params->rem_addr = ist2(ptr, strlen(ptr));
params->p->data += params->rem_addr.len;
}
}
if (!(params->mask & FCGI_SP_REM_PORT)) {
char *end;
int port = 0;
if (conn_get_src(cli_conn))
port = get_host_port(cli_conn->src);
end = ultoa_o(port, b_tail(params->p), b_room(params->p));
if (!end)
goto error;
params->rem_port = ist2(b_tail(params->p), end - b_tail(params->p));
params->p->data += params->rem_port.len;
}
if (!(params->mask & FCGI_SP_CONT_LEN)) {
struct htx_blk *blk;
enum htx_blk_type type;
char *end;
size_t len = 0;
for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
type = htx_get_blk_type(blk);
if (type == HTX_BLK_EOM || type == HTX_BLK_TLR || type == HTX_BLK_EOT)
break;
if (type == HTX_BLK_DATA)
len += htx_get_blksz(blk);
}
end = ultoa_o(len, b_tail(params->p), b_room(params->p));
if (!end)
goto error;
params->cont_len = ist2(b_tail(params->p), end - b_tail(params->p));
params->p->data += params->cont_len.len;
}
#ifdef USE_OPENSSL
if (!(params->mask & FCGI_SP_HTTPS)) {
params->https = ssl_sock_is_ssl(cli_conn);
}
#endif
if ((params->mask & FCGI_SP_URI_MASK) != FCGI_SP_URI_MASK) {
/* one of scriptname, pathinfo or query_string is no set */
struct ist path = http_get_path(params->uri);
int len;
/* Decode the path. it must first be copied to keep the URI
* untouched.
*/
chunk_memcat(params->p, path.ptr, path.len);
path.ptr = b_tail(params->p) - path.len;
path.ptr[path.len] = '\0';
len = url_decode(path.ptr);
if (len < 0)
goto error;
path.len = len;
/* No scrit_name set but no valid path ==> error */
if (!(params->mask & FCGI_SP_SCRIPT_NAME) && !istlen(path))
goto error;
/* Find limit between the path and the query-string */
for (len = 0; len < path.len && *(path.ptr + len) != '?'; len++);
/* If there is a query-string, Set it if not already set */
if (!(params->mask & FCGI_SP_REQ_QS) && len < path.len)
params->qs = ist2(path.ptr+len+1, path.len-len-1);
/* If the script_name is set, don't try to deduce the path_info
* too. The opposite is not true.
*/
if (params->mask & FCGI_SP_SCRIPT_NAME) {
params->mask |= FCGI_SP_PATH_INFO;
goto end;
}
/* script_name not set, preset it with the path for now */
params->scriptname = ist2(path.ptr, len);
/* If there is no regex to match the pathinfo, just to the last
* part and see if the index must be used.
*/
if (!fconn->app->pathinfo_re)
goto check_index;
/* The regex does not match, just to the last part and see if
* the index must be used.
*/
if (!regex_exec_match2(fconn->app->pathinfo_re, path.ptr, len, MAX_MATCH, pmatch, 0))
goto check_index;
/* We must have at least 2 captures, otherwise we do nothing and
* jump to the last part. Only first 2 ones will be considered
*/
if (pmatch[1].rm_so == -1 || pmatch[1].rm_eo == -1 ||
pmatch[2].rm_so == -1 || pmatch[2].rm_eo == -1)
goto check_index;
/* Finally we can set the script_name and the path_info */
params->scriptname = ist2(path.ptr + pmatch[1].rm_so, pmatch[1].rm_eo - pmatch[1].rm_so);
params->pathinfo = ist2(path.ptr + pmatch[2].rm_so, pmatch[2].rm_eo - pmatch[2].rm_so);
check_index:
len = params->scriptname.len;
/* the script_name if finished by a '/' so we can add the index
* part, if any.
*/
if (istlen(fconn->app->index) && params->scriptname.ptr[len-1] == '/') {
struct ist sn = params->scriptname;
params->scriptname = ist2(b_tail(params->p), len+fconn->app->index.len);
chunk_memcat(params->p, sn.ptr, sn.len);
chunk_memcat(params->p, fconn->app->index.ptr, fconn->app->index.len);
}
}
end:
return 1;
error:
return 0;
}
static int fcgi_encode_default_param(struct fcgi_conn *fconn, struct fcgi_strm *fstrm,
struct fcgi_strm_params *params, struct buffer *outbuf, int flag)
{
struct fcgi_param p;
if (params->mask & flag)
return 1;
chunk_reset(&trash);
switch (flag) {
case FCGI_SP_CGI_GATEWAY:
p.n = ist("GATEWAY_INTERFACE");
p.v = ist("CGI/1.1");
goto encode;
case FCGI_SP_DOC_ROOT:
p.n = ist("DOCUMENT_ROOT");
p.v = params->docroot;
goto encode;
case FCGI_SP_SCRIPT_NAME:
p.n = ist("SCRIPT_NAME");
p.v = params->scriptname;
goto encode;
case FCGI_SP_PATH_INFO:
p.n = ist("PATH_INFO");
p.v = params->pathinfo;
goto encode;
case FCGI_SP_REQ_URI:
p.n = ist("REQUEST_URI");
p.v = params->uri;
goto encode;
case FCGI_SP_REQ_METH:
p.n = ist("REQUEST_METHOD");
p.v = params->meth;
goto encode;
case FCGI_SP_REQ_QS:
p.n = ist("QUERY_STRING");
p.v = params->qs;
goto encode;
case FCGI_SP_SRV_NAME:
p.n = ist("SERVER_NAME");
p.v = params->srv_name;
goto encode;
case FCGI_SP_SRV_PORT:
p.n = ist("SERVER_PORT");
p.v = params->srv_port;
goto encode;
case FCGI_SP_SRV_PROTO:
p.n = ist("SERVER_PROTOCOL");
p.v = params->vsn;
goto encode;
case FCGI_SP_REM_ADDR:
p.n = ist("REMOTE_ADDR");
p.v = params->rem_addr;
goto encode;
case FCGI_SP_REM_PORT:
p.n = ist("REMOTE_PORT");
p.v = params->rem_port;
goto encode;
case FCGI_SP_SCRIPT_FILE:
p.n = ist("SCRIPT_FILENAME");
chunk_memcat(&trash, params->docroot.ptr, params->docroot.len);
chunk_memcat(&trash, params->scriptname.ptr, params->scriptname.len);
p.v = ist2(b_head(&trash), b_data(&trash));
goto encode;
case FCGI_SP_PATH_TRANS:
if (!istlen(params->pathinfo))
goto skip;
p.n = ist("PATH_TRANSLATED");
chunk_memcat(&trash, params->docroot.ptr, params->docroot.len);
chunk_memcat(&trash, params->pathinfo.ptr, params->pathinfo.len);
p.v = ist2(b_head(&trash), b_data(&trash));
goto encode;
case FCGI_SP_CONT_LEN:
p.n = ist("CONTENT_LENGTH");
p.v = params->cont_len;
goto encode;
case FCGI_SP_HTTPS:
if (!params->https)
goto skip;
p.n = ist("HTTPS");
p.v = ist("on");
goto encode;
default:
goto skip;
}
encode:
if (!istlen(p.v))
goto skip;
if (!fcgi_encode_param(outbuf, &p))
return 0;
skip:
params->mask |= flag;
return 1;
}
/* Sends a GET_VALUES record. Returns > 0 on success, 0 if it couldn't do
* anything. It is highly unexpected, but if the record is larger than a buffer
* and cannot be encoded in one time, an error is triggered and the connection is
* closed. GET_VALUES record cannot be split.
*/
static int fcgi_conn_send_get_values(struct fcgi_conn *fconn)
{
struct buffer outbuf;
struct buffer *mbuf;
struct fcgi_param max_reqs = { .n = ist("FCGI_MAX_REQS"), .v = ist("")};
struct fcgi_param mpxs_conns = { .n = ist("FCGI_MPXS_CONNS"), .v = ist("")};
int ret;
mbuf = br_tail(fconn->mbuf);
retry:
if (!fcgi_get_buf(fconn, mbuf)) {
fconn->flags |= FCGI_CF_MUX_MALLOC;
fconn->flags |= FCGI_CF_DEM_MROOM;
return 0;
}
while (1) {
outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
if (outbuf.size >= 8 || !b_space_wraps(mbuf))
break;
realign_again:
b_slow_realign(mbuf, trash.area, b_data(mbuf));
}
if (outbuf.size < 8)
goto full;
/* vsn: 1(FCGI_VERSION), type: (9)FCGI_GET_VALUES, id: 0x0000,
* len: 0x0000 (fill later), padding: 0x00, rsv: 0x00 */
memcpy(outbuf.area, "\x01\x09\x00\x00\x00\x00\x00\x00", 8);
outbuf.data = 8;
/* Note: Don't send the param FCGI_MAX_CONNS because its value cannot be
* handled by HAProxy.
*/
if (!fcgi_encode_param(&outbuf, &max_reqs) || !fcgi_encode_param(&outbuf, &mpxs_conns))
goto full;
/* update the record's size now */
fcgi_set_record_size(outbuf.area, outbuf.data - 8);
b_add(mbuf, outbuf.data);
ret = 1;
end:
return ret;
full:
/* Too large to be encoded. For GET_VALUES records, it is an error */
if (!b_data(mbuf))
goto fail;
if ((mbuf = br_tail_add(fconn->mbuf)) != NULL)
goto retry;
fconn->flags |= FCGI_CF_MUX_MFULL;
fconn->flags |= FCGI_CF_DEM_MROOM;
ret = 0;
goto end;
fail:
fconn->state = FCGI_CS_CLOSED;
ret = 0;
goto end;
}
/* Processes a GET_VALUES_RESULT record. Returns > 0 on success, 0 if it
* couldn't do anything. It is highly unexpected, but if the record is larger
* than a buffer and cannot be decoded in one time, an error is triggered and
* the connection is closed. GET_VALUES_RESULT record cannot be split.
*/
static int fcgi_conn_handle_values_result(struct fcgi_conn *fconn)
{
struct buffer inbuf;
struct buffer *dbuf;
size_t offset;
dbuf = &fconn->dbuf;
/* Record too large to be fully decoded */
if (b_size(dbuf) < (fconn->drl + fconn->drp))
goto fail;
/* process full record only */
if (b_data(dbuf) < (fconn->drl + fconn->drp))
return 0;
if (unlikely(b_contig_data(dbuf, b_head_ofs(dbuf)) < fconn->drl)) {
/* Realign the dmux buffer if the record wraps. It is unexpected
* at this stage because it should be the first record received
* from the FCGI application.
*/
b_slow_realign(dbuf, trash.area, 0);
}
inbuf = b_make(b_head(dbuf), b_data(dbuf), 0, fconn->drl);
for (offset = 0; offset < b_data(&inbuf); ) {
struct fcgi_param p;
size_t ret;
ret = fcgi_aligned_decode_param(&inbuf, offset, &p);
if (!ret) {
/* name or value too large to be decoded at once */
goto fail;
}
offset += ret;
if (isteqi(p.n, ist("FCGI_MPXS_CONNS"))) {
if (isteq(p.v, ist("1")))
fconn->flags |= FCGI_CF_MPXS_CONNS;
else
fconn->flags &= ~FCGI_CF_MPXS_CONNS;
}
else if (isteqi(p.n, ist("FCGI_MAX_REQS"))) {
fconn->streams_limit = strl2ui(p.v.ptr, p.v.len);
}
/*
* Ignore all other params
*/
}
/* Reset the number of concurrent streams supported if the FCGI
* application does not support connection multiplexing
*/
if (!(fconn->flags & FCGI_CF_MPXS_CONNS))
fconn->streams_limit = 1;
/* We must be sure to have read exactly the announced record length, no
* more no less
*/
if (offset != fconn->drl)
goto fail;
b_del(&fconn->dbuf, fconn->drl + fconn->drp);
fconn->drl = 0;
fconn->drp = 0;
fconn->state = FCGI_CS_RECORD_H;
fcgi_wake_unassigned_streams(fconn);
return 1;
fail:
fconn->state = FCGI_CS_CLOSED;
return 0;
}
/* Sends an ABORT_REQUEST record for each active streams. Closed streams are
* excluded, as the streams which already received the end-of-stream. It returns
* > 0 if the record was sent tp all streams. Otherwise it returns 0.
*/
static int fcgi_conn_send_aborts(struct fcgi_conn *fconn)
{
struct eb32_node *node;
struct fcgi_strm *fstrm;
node = eb32_lookup_ge(&fconn->streams_by_id, 1);
while (node) {
fstrm = container_of(node, struct fcgi_strm, by_id);
node = eb32_next(node);
if (fstrm->state != FCGI_SS_CLOSED &&
!(fstrm->flags & (FCGI_SF_ES_RCVD|FCGI_SF_ABRT_SENT)) &&
!fcgi_strm_send_abort(fconn, fstrm))
return 0;
}
fconn->flags |= FCGI_CF_ABRTS_SENT;
return 1;
}
/* Sends a BEGIN_REQUEST record. It returns > 0 on success, 0 if it couldn't do
* anything. BEGIN_REQUEST record cannot be split. So we wait to have enough
* space to proceed. It is small enough to be encoded in an empty buffer.
*/
static int fcgi_strm_send_begin_request(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
{
struct buffer outbuf;
struct buffer *mbuf;
struct fcgi_begin_request rec = { .role = FCGI_RESPONDER, .flags = 0};
int ret;
mbuf = br_tail(fconn->mbuf);
retry:
if (!fcgi_get_buf(fconn, mbuf)) {
fconn->flags |= FCGI_CF_MUX_MALLOC;
fconn->flags |= FCGI_CF_DEM_MROOM;
return 0;
}
while (1) {
outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
if (outbuf.size >= 8 || !b_space_wraps(mbuf))
break;
realign_again:
b_slow_realign(mbuf, trash.area, b_data(mbuf));
}
if (outbuf.size < 8)
goto full;
/* vsn: 1(FCGI_VERSION), type: (1)FCGI_BEGIN_REQUEST, id: fstrm->id,
* len: 0x0008, padding: 0x00, rsv: 0x00 */
memcpy(outbuf.area, "\x01\x01\x00\x00\x00\x08\x00\x00", 8);
fcgi_set_record_id(outbuf.area, fstrm->id);
outbuf.data = 8;
if (fconn->flags & FCGI_CF_KEEP_CONN)
rec.flags |= FCGI_KEEP_CONN;
if (!fcgi_encode_begin_request(&outbuf, &rec))
goto full;
/* commit the record */
b_add(mbuf, outbuf.data);
fstrm->flags |= FCGI_SF_BEGIN_SENT;
fstrm->state = FCGI_SS_OPEN;
ret = 1;
end:
return ret;
full:
if ((mbuf = br_tail_add(fconn->mbuf)) != NULL)
goto retry;
fconn->flags |= FCGI_CF_MUX_MFULL;
fstrm->flags |= FCGI_SF_BLK_MROOM;
ret = 0;
goto end;
}
/* Sends an empty record of type <rtype>. It returns > 0 on success, 0 if it
* couldn't do anything. Empty record cannot be split. So we wait to have enough
* space to proceed. It is small enough to be encoded in an empty buffer.
*/
static int fcgi_strm_send_empty_record(struct fcgi_conn *fconn, struct fcgi_strm *fstrm,
enum fcgi_record_type rtype)
{
struct buffer outbuf;
struct buffer *mbuf;
int ret;
mbuf = br_tail(fconn->mbuf);
retry:
if (!fcgi_get_buf(fconn, mbuf)) {
fconn->flags |= FCGI_CF_MUX_MALLOC;
fconn->flags |= FCGI_CF_DEM_MROOM;
return 0;
}
while (1) {
outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
if (outbuf.size >= 8 || !b_space_wraps(mbuf))
break;
realign_again:
b_slow_realign(mbuf, trash.area, b_data(mbuf));
}
if (outbuf.size < 8)
goto full;
/* vsn: 1(FCGI_VERSION), type: rtype, id: fstrm->id,
* len: 0x0000, padding: 0x00, rsv: 0x00 */
memcpy(outbuf.area, "\x01\x05\x00\x00\x00\x00\x00\x00", 8);
outbuf.area[1] = rtype;
fcgi_set_record_id(outbuf.area, fstrm->id);
outbuf.data = 8;
/* commit the record */
b_add(mbuf, outbuf.data);
ret = 1;
end:
return ret;
full:
if ((mbuf = br_tail_add(fconn->mbuf)) != NULL)
goto retry;
fconn->flags |= FCGI_CF_MUX_MFULL;
fstrm->flags |= FCGI_SF_BLK_MROOM;
ret = 0;
goto end;
}
/* Sends an empty PARAMS record. It relies on fcgi_strm_send_empty_record(). It
* marks the end of params.
*/
static int fcgi_strm_send_empty_params(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
{
return fcgi_strm_send_empty_record(fconn, fstrm, FCGI_PARAMS);
}
/* Sends an empty STDIN record. It relies on fcgi_strm_send_empty_record(). It
* marks the end of input. On success, all the request was successfully sent.
*/
static int fcgi_strm_send_empty_stdin(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
{
int ret;
ret = fcgi_strm_send_empty_record(fconn, fstrm, FCGI_STDIN);
if (ret)
fstrm->flags |= FCGI_SF_ES_SENT;
return ret;
}
/* Sends an ABORT_REQUEST record. It relies on fcgi_strm_send_empty_record(). It
* stops the request processing.
*/
static int fcgi_strm_send_abort(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
{
int ret;
ret = fcgi_strm_send_empty_record(fconn, fstrm, FCGI_ABORT_REQUEST);
if (ret)
fstrm->flags |= FCGI_SF_ABRT_SENT;
return ret;
}
/* Sends a PARAMS record. Returns > 0 on success, 0 if it couldn't do
* anything. If there are too much K/V params to be encoded in a PARAMS record,
* several records are sent. However, a K/V param cannot be split between 2
* records.
*/
static size_t fcgi_strm_send_params(struct fcgi_conn *fconn, struct fcgi_strm *fstrm,
struct htx *htx)
{
struct buffer outbuf;
struct buffer *mbuf;
struct htx_blk *blk;
struct htx_sl *sl = NULL;
struct fcgi_strm_params params;
size_t total = 0;
memset(&params, 0, sizeof(params));
params.p = get_trash_chunk();
mbuf = br_tail(fconn->mbuf);
retry:
if (!fcgi_get_buf(fconn, mbuf)) {
fconn->flags |= FCGI_CF_MUX_MALLOC;
fconn->flags |= FCGI_CF_DEM_MROOM;
return 0;
}
while (1) {
outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
if (outbuf.size >= 8 || !b_space_wraps(mbuf))
break;
realign_again:
b_slow_realign(mbuf, trash.area, b_data(mbuf));
}
if (outbuf.size < 8)
goto full;
/* vsn: 1(FCGI_VERSION), type: (4)FCGI_PARAMS, id: fstrm->id,
* len: 0x0000 (fill later), padding: 0x00, rsv: 0x00 */
memcpy(outbuf.area, "\x01\x04\x00\x00\x00\x00\x00\x00", 8);
fcgi_set_record_id(outbuf.area, fstrm->id);
outbuf.data = 8;
blk = htx_get_head_blk(htx);
while (blk) {
enum htx_blk_type type;
uint32_t size = htx_get_blksz(blk);
struct fcgi_param p;
type = htx_get_blk_type(blk);
switch (type) {
case HTX_BLK_REQ_SL:
sl = htx_get_blk_ptr(htx, blk);
if (sl->info.req.meth == HTTP_METH_HEAD)
fstrm->h1m.flags |= H1_MF_METH_HEAD;
if (sl->flags & HTX_SL_F_VER_11)
fstrm->h1m.flags |= H1_MF_VER_11;
break;
case HTX_BLK_HDR:
p.n = htx_get_blk_name(htx, blk);
p.v = htx_get_blk_value(htx, blk);
if (istmatch(p.n, ist(":fcgi-"))) {
p.n.ptr += 6;
p.n.len -= 6;
if (isteq(p.n, ist("gateway_interface")))
params.mask |= FCGI_SP_CGI_GATEWAY;
else if (isteq(p.n, ist("document_root"))) {
params.mask |= FCGI_SP_DOC_ROOT;
params.docroot = p.v;
}
else if (isteq(p.n, ist("script_name"))) {
params.mask |= FCGI_SP_SCRIPT_NAME;
params.scriptname = p.v;
}
else if (isteq(p.n, ist("path_info"))) {
params.mask |= FCGI_SP_PATH_INFO;
params.pathinfo = p.v;
}
else if (isteq(p.n, ist("request_uri"))) {
params.mask |= FCGI_SP_REQ_URI;
params.uri = p.v;
}
else if (isteq(p.n, ist("request_meth")))
params.mask |= FCGI_SP_REQ_METH;
else if (isteq(p.n, ist("query_string")))
params.mask |= FCGI_SP_REQ_QS;
else if (isteq(p.n, ist("server_name")))
params.mask |= FCGI_SP_SRV_NAME;
else if (isteq(p.n, ist("server_port")))
params.mask |= FCGI_SP_SRV_PORT;
else if (isteq(p.n, ist("server_protocol")))
params.mask |= FCGI_SP_SRV_PROTO;
else if (isteq(p.n, ist("remote_addr")))
params.mask |= FCGI_SP_REM_ADDR;
else if (isteq(p.n, ist("remote_port")))
params.mask |= FCGI_SP_REM_PORT;
else if (isteq(p.n, ist("script_filename")))
params.mask |= FCGI_SP_SCRIPT_FILE;
else if (isteq(p.n, ist("path_translated")))
params.mask |= FCGI_SP_PATH_TRANS;
else if (isteq(p.n, ist("https")))
params.mask |= FCGI_SP_HTTPS;
}
else if (isteq(p.n, ist("content-length"))) {
p.n = ist("CONTENT_LENGTH");
params.mask |= FCGI_SP_CONT_LEN;
}
else if (isteq(p.n, ist("content-type")))
p.n = ist("CONTENT_TYPE");
else {
if (isteq(p.n, ist("host")))
params.srv_name = p.v;
memcpy(trash.area, "http_", 5);
memcpy(trash.area+5, p.n.ptr, p.n.len);
p.n = ist2(trash.area, p.n.len+5);
}
if (!fcgi_encode_param(&outbuf, &p)) {
if (b_space_wraps(mbuf))
goto realign_again;
if (outbuf.data == 8)
goto full;
goto done;
}
break;
case HTX_BLK_EOH:
if (fconn->proxy->server_id_hdr_name) {
struct server *srv = objt_server(fconn->conn->target);
if (!srv)
goto done;
memcpy(trash.area, "http_", 5);
memcpy(trash.area+5, fconn->proxy->server_id_hdr_name, fconn->proxy->server_id_hdr_len);
p.n = ist2(trash.area, fconn->proxy->server_id_hdr_len+5);
p.v = ist(srv->id);
if (!fcgi_encode_param(&outbuf, &p)) {
if (b_space_wraps(mbuf))
goto realign_again;
if (outbuf.data == 8)
goto full;
}
}
goto done;
default:
break;
}
total += size;
blk = htx_remove_blk(htx, blk);
}
done:
if (!fcgi_set_default_param(fconn, fstrm, htx, sl, &params))
goto error;
if (!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_CGI_GATEWAY) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_DOC_ROOT) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SCRIPT_NAME) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_PATH_INFO) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_REQ_URI) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_REQ_METH) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_REQ_QS) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SRV_NAME) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SRV_PORT) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SRV_PROTO) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_REM_ADDR) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_REM_PORT) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SCRIPT_FILE) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_PATH_TRANS) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_CONT_LEN) ||
!fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_HTTPS))
goto error;
/* update the record's size */
fcgi_set_record_size(outbuf.area, outbuf.data - 8);
b_add(mbuf, outbuf.data);
end:
return total;
full:
if ((mbuf = br_tail_add(fconn->mbuf)) != NULL)
goto retry;
fconn->flags |= FCGI_CF_MUX_MFULL;
fstrm->flags |= FCGI_SF_BLK_MROOM;
if (total)
goto error;
goto end;
error:
htx->flags |= HTX_FL_PROCESSING_ERROR;
fcgi_strm_error(fstrm);
goto end;
}
/* Sends a STDIN record. Returns > 0 on success, 0 if it couldn't do
* anything. STDIN records contain the request body.
*/
static size_t fcgi_strm_send_stdin(struct fcgi_conn *fconn, struct fcgi_strm *fstrm,
struct htx *htx, size_t count, struct buffer *buf)
{
struct buffer outbuf;
struct buffer *mbuf;
struct htx_blk *blk;
enum htx_blk_type type;
uint32_t size;
size_t total = 0;
if (!count)
goto end;
mbuf = br_tail(fconn->mbuf);
retry:
if (!fcgi_get_buf(fconn, mbuf)) {
fconn->flags |= FCGI_CF_MUX_MALLOC;
fconn->flags |= FCGI_CF_DEM_MROOM;
return 0;
}
/* Perform some optimizations to reduce the number of buffer copies.
* First, if the mux's buffer is empty and the htx area contains exactly
* one data block of the same size as the requested count, and this
* count fits within the record size, then it's possible to simply swap
* the caller's buffer with the mux's output buffer and adjust offsets
* and length to match the entire DATA HTX block in the middle. In this
* case we perform a true zero-copy operation from end-to-end. This is
* the situation that happens all the time with large files. Second, if
* this is not possible, but the mux's output buffer is empty, we still
* have an opportunity to avoid the copy to the intermediary buffer, by
* making the intermediary buffer's area point to the output buffer's
* area. In this case we want to skip the HTX header to make sure that
* copies remain aligned and that this operation remains possible all
* the time. This goes for headers, data blocks and any data extracted
* from the HTX blocks.
*/
blk = htx_get_head_blk(htx);
if (!blk)
goto end;
type = htx_get_blk_type(blk);
size = htx_get_blksz(blk);
if (unlikely(size == count && htx_nbblks(htx) == 1 && type == HTX_BLK_DATA)) {
void *old_area = mbuf->area;
if (b_data(mbuf)) {
/* Too bad there are data left there. We're willing to memcpy/memmove
* up to 1/4 of the buffer, which means that it's OK to copy a large
* record into a buffer containing few data if it needs to be realigned,
* and that it's also OK to copy few data without realigning. Otherwise
* we'll pretend the mbuf is full and wait for it to become empty.
*/
if (size + 8 <= b_room(mbuf) &&
(b_data(mbuf) <= b_size(mbuf) / 4 ||
(size <= b_size(mbuf) / 4 && size + 8 <= b_contig_space(mbuf))))
goto copy;
if ((mbuf = br_tail_add(fconn->mbuf)) != NULL)
goto retry;
fconn->flags |= FCGI_CF_MUX_MFULL;
fstrm->flags |= FCGI_SF_BLK_MROOM;
goto end;
}
/* map a FCGI record to the HTX block so that we can put the
* record header there.
*/
*mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - 8, size + 8);
outbuf.area = b_head(mbuf);
/* prepend a FCGI record header just before the DATA block */
memcpy(outbuf.area, "\x01\x05\x00\x00\x00\x00\x00\x00", 8);
fcgi_set_record_id(outbuf.area, fstrm->id);
fcgi_set_record_size(outbuf.area, size);
/* and exchange with our old area */
buf->area = old_area;
buf->data = buf->head = 0;
total += size;
goto end;
}
copy:
while (1) {
outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
if (outbuf.size >= 8 || !b_space_wraps(mbuf))
break;
realign_again:
b_slow_realign(mbuf, trash.area, b_data(mbuf));
}
if (outbuf.size < 8)
goto full;
/* vsn: 1(FCGI_VERSION), type: (5)FCGI_STDIN, id: fstrm->id,
* len: 0x0000 (fill later), padding: 0x00, rsv: 0x00 */
memcpy(outbuf.area, "\x01\x05\x00\x00\x00\x00\x00\x00", 8);
fcgi_set_record_id(outbuf.area, fstrm->id);
outbuf.data = 8;
blk = htx_get_head_blk(htx);
while (blk && count) {
enum htx_blk_type type = htx_get_blk_type(blk);
uint32_t size = htx_get_blksz(blk);
struct ist v;
switch (type) {
case HTX_BLK_DATA:
v = htx_get_blk_value(htx, blk);
if (v.len > count)
v.len = count;
if (v.len > b_room(&outbuf)) {
/* It doesn't fit at once. If it at least fits once split and
* the amount of data to move is low, let's defragment the
* buffer now.
*/
if (b_space_wraps(mbuf) &&
b_data(&outbuf) + v.len <= b_room(mbuf) &&
b_data(mbuf) <= MAX_DATA_REALIGN)
goto realign_again;
v.len = b_room(&outbuf);
}
if (!v.len || !chunk_memcat(&outbuf, v.ptr, v.len)) {
if (outbuf.data == 8)
goto full;
goto done;
}
if (v.len != size) {
total += v.len;
count -= v.len;
htx_cut_data_blk(htx, blk, v.len);
goto done;
}
break;
case HTX_BLK_EOM:
goto done;
default:
break;
}
total += size;
count -= size;
blk = htx_remove_blk(htx, blk);
}
done:
/* update the record's size */
fcgi_set_record_size(outbuf.area, outbuf.data - 8);
b_add(mbuf, outbuf.data);
end:
return total;
full:
if ((mbuf = br_tail_add(fconn->mbuf)) != NULL)
goto retry;
fconn->flags |= FCGI_CF_MUX_MFULL;
fstrm->flags |= FCGI_SF_BLK_MROOM;
goto end;
}
/* Processes a STDOUT record. Returns > 0 on success, 0 if it couldn't do
* anything. STDOUT records contain the entire response. All the content is
* copied in the stream's rxbuf. The parsing will be handled in fcgi_rcv_buf().
*/
static int fcgi_strm_handle_stdout(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
{
struct buffer *dbuf;
size_t ret;
size_t max;
dbuf = &fconn->dbuf;
/* Only padding remains */
if (fconn->state == FCGI_CS_RECORD_P)
goto end_transfer;
if (b_data(dbuf) < (fconn->drl + fconn->drp) &&
b_size(dbuf) > (fconn->drl + fconn->drp) &&
buf_room_for_htx_data(dbuf))
goto fail; // incomplete record
if (!fcgi_get_buf(fconn, &fstrm->rxbuf)) {
fconn->flags |= FCGI_CF_DEM_SALLOC;
return 0;
}
/*max = MIN(b_room(&fstrm->rxbuf), fconn->drl);*/
max = buf_room_for_htx_data(&fstrm->rxbuf);
if (!b_data(&fstrm->rxbuf))
fstrm->rxbuf.head = sizeof(struct htx);
if (max > fconn->drl)
max = fconn->drl;
ret = b_xfer(&fstrm->rxbuf, dbuf, max);
if (!ret)
goto fail;
fconn->drl -= ret;
if (!buf_room_for_htx_data(&fstrm->rxbuf))
fconn->flags |= FCGI_CF_DEM_SFULL;
if (fconn->drl)
goto fail;
end_transfer:
fconn->drl += fconn->drp;
fconn->drp = 0;
ret = MIN(b_data(&fconn->dbuf), fconn->drl);
b_del(&fconn->dbuf, ret);
fconn->drl -= ret;
if (fconn->drl)
goto fail;
fconn->state = FCGI_CS_RECORD_H;
return 1;
fail:
return 0;
}
/* Processes an empty STDOUT. Returns > 0 on success, 0 if it couldn't do
* anything. It only skip the padding in fact, there is no payload for such
* records. It makrs the end of the response.
*/
static int fcgi_strm_handle_empty_stdout(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
{
int ret;
fconn->state = FCGI_CS_RECORD_P;
fconn->drl += fconn->drp;
fconn->drp = 0;
ret = MIN(b_data(&fconn->dbuf), fconn->drl);
b_del(&fconn->dbuf, ret);
fconn->drl -= ret;
if (fconn->drl)
return 0;
fconn->state = FCGI_CS_RECORD_H;
fstrm->state |= FCGI_SF_ES_RCVD;
return 1;
}
/* Processes a STDERR record. Returns > 0 on success, 0 if it couldn't do
* anything.
*/
static int fcgi_strm_handle_stderr(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
{
struct buffer *dbuf;
struct buffer tag;
size_t ret;
dbuf = &fconn->dbuf;
/* Only padding remains */
if (fconn->state == FCGI_CS_RECORD_P)
goto end_transfer;
if (b_data(dbuf) < (fconn->drl + fconn->drp) &&
b_size(dbuf) > (fconn->drl + fconn->drp) &&
buf_room_for_htx_data(dbuf))
goto fail; // incomplete record
chunk_reset(&trash);
ret = b_xfer(&trash, dbuf, MIN(b_room(&trash), fconn->drl));
if (!ret)
goto fail;
fconn->drl -= ret;
trash.area[ret] = '\n';
trash.area[ret+1] = '\0';
tag.area = fconn->app->name; tag.data = strlen(fconn->app->name);
app_log(&fconn->app->logsrvs, &tag, LOG_ERR, "%s", trash.area);
if (fconn->drl)
goto fail;
end_transfer:
fconn->drl += fconn->drp;
fconn->drp = 0;
ret = MIN(b_data(&fconn->dbuf), fconn->drl);
b_del(&fconn->dbuf, ret);
fconn->drl -= ret;
if (fconn->drl)
goto fail;
fconn->state = FCGI_CS_RECORD_H;
return 1;
fail:
return 0;
}
/* Processes an END_REQUEST record. Returns > 0 on success, 0 if it couldn't do
* anything. If the empty STDOUT record is not already received, this one marks
* the end of the response. It is highly unexpected, but if the record is larger
* than a buffer and cannot be decoded in one time, an error is triggered and
* the connection is closed. END_REQUEST record cannot be split.
*/
static int fcgi_strm_handle_end_request(struct fcgi_conn *fconn, struct fcgi_strm *fstrm)
{
struct buffer inbuf;
struct buffer *dbuf;
struct fcgi_end_request endreq;
dbuf = &fconn->dbuf;
/* Record too large to be fully decoded */
if (b_size(dbuf) < (fconn->drl + fconn->drp))
goto fail;
/* process full record only */
if (b_data(dbuf) < (fconn->drl + fconn->drp))
return 0;
if (unlikely(b_contig_data(dbuf, b_head_ofs(dbuf)) < fconn->drl)) {
/* Realign the dmux buffer if the record wraps. It is unexpected
* at this stage because it should be the first record received
* from the FCGI application.
*/
b_slow_realign(dbuf, trash.area, 0);
}
inbuf = b_make(b_head(dbuf), b_data(dbuf), 0, fconn->drl);
if (!fcgi_decode_end_request(&inbuf, 0, &endreq))
goto fail;
fstrm->flags |= FCGI_SF_ES_RCVD;
fstrm->proto_status = endreq.errcode;
fcgi_strm_close(fstrm);
b_del(&fconn->dbuf, fconn->drl + fconn->drp);
fconn->drl = 0;
fconn->drp = 0;
fconn->state = FCGI_CS_RECORD_H;
return 1;
fail:
fcgi_strm_error(fstrm);
return 0;
}
/* process Rx records to be demultiplexed */
static void fcgi_process_demux(struct fcgi_conn *fconn)
{
struct fcgi_strm *fstrm = NULL, *tmp_fstrm;
struct fcgi_header hdr;
int ret;
if (fconn->state == FCGI_CS_CLOSED)
return;
if (unlikely(fconn->state < FCGI_CS_RECORD_H)) {
if (fconn->state == FCGI_CS_INIT)
return;
if (fconn->state == FCGI_CS_SETTINGS) {
/* ensure that what is pending is a valid GET_VALUES_RESULT record. */
ret = fcgi_decode_record_hdr(&fconn->dbuf, 0, &hdr);
if (!ret)
goto fail;
b_del(&fconn->dbuf, ret);
if (hdr.id || (hdr.type != FCGI_GET_VALUES_RESULT && hdr.type != FCGI_UNKNOWN_TYPE)) {
fconn->state = FCGI_CS_CLOSED;
goto fail;
}
goto new_record;
}
}
/* process as many incoming frames as possible below */
while (b_data(&fconn->dbuf)) {
if (fconn->state == FCGI_CS_CLOSED)
break;
if (fconn->state == FCGI_CS_RECORD_H) {
ret = fcgi_decode_record_hdr(&fconn->dbuf, 0, &hdr);
if (!ret)
break;
b_del(&fconn->dbuf, ret);
new_record:
fconn->dsi = hdr.id;
fconn->drt = hdr.type;
fconn->drl = hdr.len;
fconn->drp = hdr.padding;
fconn->state = FCGI_CS_RECORD_D;
}
/* Only FCGI_CS_RECORD_D or FCGI_CS_RECORD_P */
tmp_fstrm = fcgi_conn_st_by_id(fconn, fconn->dsi);
if (tmp_fstrm != fstrm && fstrm && fstrm->cs &&
(b_data(&fstrm->rxbuf) ||
conn_xprt_read0_pending(fconn->conn) ||
fstrm->state == FCGI_SS_CLOSED ||
(fstrm->flags & FCGI_SF_ES_RCVD) ||
(fstrm->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
/* we may have to signal the upper layers */
fstrm->cs->flags |= CS_FL_RCV_MORE;
fcgi_strm_notify_recv(fstrm);
}
fstrm = tmp_fstrm;
if (fstrm->state == FCGI_SS_CLOSED && fconn->dsi != 0) {
/* ignore all record for closed streams */
goto ignore_record;
}
if (fstrm->state == FCGI_SS_IDLE) {
/* ignore all record for unknown streams */
goto ignore_record;
}
switch (fconn->drt) {
case FCGI_GET_VALUES_RESULT:
ret = fcgi_conn_handle_values_result(fconn);
break;
case FCGI_STDOUT:
if (fstrm->flags & FCGI_SF_ES_RCVD)
goto ignore_record;
if (fconn->drl)
ret = fcgi_strm_handle_stdout(fconn, fstrm);
else
ret = fcgi_strm_handle_empty_stdout(fconn, fstrm);
break;
case FCGI_STDERR:
ret = fcgi_strm_handle_stderr(fconn, fstrm);
break;
case FCGI_END_REQUEST:
ret = fcgi_strm_handle_end_request(fconn, fstrm);
break;
/* implement all extra frame types here */
default:
ignore_record:
/* drop records that we ignore. They may be
* larger than the buffer so we drain all of
* their contents until we reach the end.
*/
fconn->state = FCGI_CS_RECORD_P;
fconn->drl += fconn->drp;
fconn->drp = 0;
ret = MIN(b_data(&fconn->dbuf), fconn->drl);
b_del(&fconn->dbuf, ret);
fconn->drl -= ret;
ret = (fconn->drl == 0);
}
/* error or missing data condition met above ? */
if (ret <= 0)
break;
if (fconn->state != FCGI_CS_RECORD_H && !(fconn->drl+fconn->drp))
fconn->state = FCGI_CS_RECORD_H;
}
fail:
/* we can go here on missing data, blocked response or error */
if (fstrm && fstrm->cs &&
(b_data(&fstrm->rxbuf) ||
conn_xprt_read0_pending(fconn->conn) ||
fstrm->state == FCGI_SS_CLOSED ||
(fstrm->flags & FCGI_SF_ES_RCVD) ||
(fstrm->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
/* we may have to signal the upper layers */
fstrm->cs->flags |= CS_FL_RCV_MORE;
fcgi_strm_notify_recv(fstrm);
}
fcgi_conn_restart_reading(fconn, 0);
}
/* process Tx records from streams to be multiplexed. Returns > 0 if it reached
* the end.
*/
static int fcgi_process_mux(struct fcgi_conn *fconn)
{
struct fcgi_strm *fstrm, *fstrm_back;
if (unlikely(fconn->state < FCGI_CS_RECORD_H)) {
if (unlikely(fconn->state == FCGI_CS_INIT)) {
if (!(fconn->flags & FCGI_CF_GET_VALUES)) {
fconn->state = FCGI_CS_RECORD_H;
fcgi_wake_unassigned_streams(fconn);
goto mux;
}
if (unlikely(!fcgi_conn_send_get_values(fconn)))
goto fail;
fconn->state = FCGI_CS_SETTINGS;
}
/* need to wait for the other side */
if (fconn->state < FCGI_CS_RECORD_H)
return 1;
}
mux:
list_for_each_entry_safe(fstrm, fstrm_back, &fconn->send_list, send_list) {
if (fconn->state == FCGI_CS_CLOSED || fconn->flags & FCGI_CF_MUX_BLOCK_ANY)
break;
if (LIST_ADDED(&fstrm->sending_list))
continue;
/* For some reason, the upper layer failed to subsribe again,
* so remove it from the send_list
*/
if (!fstrm->send_wait) {
LIST_DEL_INIT(&fstrm->send_list);
continue;
}
fstrm->flags &= ~FCGI_SF_BLK_ANY;
fstrm->send_wait->events &= ~SUB_RETRY_SEND;
LIST_ADDQ(&fconn->sending_list, &fstrm->sending_list);
tasklet_wakeup(fstrm->send_wait->tasklet);
}
fail:
if (fconn->state == FCGI_CS_CLOSED) {
if (fconn->stream_cnt - fconn->nb_reserved > 0) {
fcgi_conn_send_aborts(fconn);
if (fconn->flags & FCGI_CF_MUX_BLOCK_ANY)
return 0;
}
}
return 1;
}
/* Attempt to read data, and subscribe if none available.
* The function returns 1 if data has been received, otherwise zero.
*/
static int fcgi_recv(struct fcgi_conn *fconn)
{
struct connection *conn = fconn->conn;
struct buffer *buf;
int max;
size_t ret;
if (fconn->wait_event.events & SUB_RETRY_RECV)
return (b_data(&fconn->dbuf));
if (!fcgi_recv_allowed(fconn))
return 1;
buf = fcgi_get_buf(fconn, &fconn->dbuf);
if (!buf) {
fconn->flags |= FCGI_CF_DEM_DALLOC;
return 0;
}
b_realign_if_empty(buf);
if (!b_data(buf)) {
/* try to pre-align the buffer like the
* rxbufs will be to optimize memory copies. We'll make
* sure that the frame header lands at the end of the
* HTX block to alias it upon recv. We cannot use the
* head because rcv_buf() will realign the buffer if
* it's empty. Thus we cheat and pretend we already
* have a few bytes there.
*/
max = buf_room_for_htx_data(buf) + (fconn->state == FCGI_CS_RECORD_H ? 8 : 0);
buf->head = sizeof(struct htx) - (fconn->state == FCGI_CS_RECORD_H ? 8 : 0);
}
else
max = buf_room_for_htx_data(buf);
ret = max ? conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0) : 0;
if (max && !ret && fcgi_recv_allowed(fconn))
conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &fconn->wait_event);
if (!b_data(buf)) {
fcgi_release_buf(fconn, &fconn->dbuf);
return (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn));
}
if (ret == max)
fconn->flags |= FCGI_CF_DEM_DFULL;
return !!ret || (conn->flags & CO_FL_ERROR) || conn_xprt_read0_pending(conn);
}
/* Try to send data if possible.
* The function returns 1 if data have been sent, otherwise zero.
*/
static int fcgi_send(struct fcgi_conn *fconn)
{
struct connection *conn = fconn->conn;
int done;
int sent = 0;
if (conn->flags & CO_FL_ERROR)
return 1;
if (conn->flags & (CO_FL_HANDSHAKE|CO_FL_WAIT_L4_CONN|CO_FL_WAIT_L6_CONN)) {
/* a handshake was requested */
goto schedule;
}
/* This loop is quite simple : it tries to fill as much as it can from
* pending streams into the existing buffer until it's reportedly full
* or the end of send requests is reached. Then it tries to send this
* buffer's contents out, marks it not full if at least one byte could
* be sent, and tries again.
*
* The snd_buf() function normally takes a "flags" argument which may
* be made of a combination of CO_SFL_MSG_MORE to indicate that more
* data immediately comes and CO_SFL_STREAMER to indicate that the
* connection is streaming lots of data (used to increase TLS record
* size at the expense of latency). The former can be sent any time
* there's a buffer full flag, as it indicates at least one stream
* attempted to send and failed so there are pending data. An
* alternative would be to set it as long as there's an active stream
* but that would be problematic for ACKs until we have an absolute
* guarantee that all waiters have at least one byte to send. The
* latter should possibly not be set for now.
*/
done = 0;
while (!done) {
unsigned int flags = 0;
unsigned int released = 0;
struct buffer *buf;
/* fill as much as we can into the current buffer */
while (((fconn->flags & (FCGI_CF_MUX_MFULL|FCGI_CF_MUX_MALLOC)) == 0) && !done)
done = fcgi_process_mux(fconn);
if (fconn->flags & FCGI_CF_MUX_MALLOC)
done = 1; // we won't go further without extra buffers
if (conn->flags & CO_FL_ERROR)
break;
if (fconn->flags & (FCGI_CF_MUX_MFULL | FCGI_CF_DEM_MROOM))
flags |= CO_SFL_MSG_MORE;
for (buf = br_head(fconn->mbuf); b_size(buf); buf = br_del_head(fconn->mbuf)) {
if (b_data(buf)) {
int ret;
ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), flags);
if (!ret) {
done = 1;
break;
}
sent = 1;
b_del(buf, ret);
if (b_data(buf)) {
done = 1;
break;
}
}
b_free(buf);
released++;
}
if (released)
offer_buffers(NULL, tasks_run_queue);
/* wrote at least one byte, the buffer is not full anymore */
fconn->flags &= ~(FCGI_CF_MUX_MFULL | FCGI_CF_DEM_MROOM);
}
if (conn->flags & CO_FL_SOCK_WR_SH) {
/* output closed, nothing to send, clear the buffer to release it */
b_reset(br_tail(fconn->mbuf));
}
/* We're not full anymore, so we can wake any task that are waiting
* for us.
*/
if (!(fconn->flags & (FCGI_CF_MUX_MFULL | FCGI_CF_DEM_MROOM))) {
struct fcgi_strm *fstrm;
list_for_each_entry(fstrm, &fconn->send_list, send_list) {
if (fconn->state == FCGI_CS_CLOSED || fconn->flags & FCGI_CF_MUX_BLOCK_ANY)
break;
if (LIST_ADDED(&fstrm->sending_list))
continue;
/* For some reason, the upper layer failed to subsribe again,
* so remove it from the send_list
*/
if (!fstrm->send_wait) {
LIST_DEL_INIT(&fstrm->send_list);
continue;
}
fstrm->flags &= ~FCGI_SF_BLK_ANY;
fstrm->send_wait->events &= ~SUB_RETRY_SEND;
tasklet_wakeup(fstrm->send_wait->tasklet);
LIST_ADDQ(&fconn->sending_list, &fstrm->sending_list);
}
}
/* We're done, no more to send */
if (!br_data(fconn->mbuf))
return sent;
schedule:
if (!(conn->flags & CO_FL_ERROR) && !(fconn->wait_event.events & SUB_RETRY_SEND))
conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &fconn->wait_event);
return sent;
}
/* this is the tasklet referenced in fconn->wait_event.tasklet */
static struct task *fcgi_io_cb(struct task *t, void *ctx, unsigned short status)
{
struct fcgi_conn *fconn = ctx;
int ret = 0;
if (!(fconn->wait_event.events & SUB_RETRY_SEND))
ret = fcgi_send(fconn);
if (!(fconn->wait_event.events & SUB_RETRY_RECV))
ret |= fcgi_recv(fconn);
if (ret || b_data(&fconn->dbuf))
fcgi_process(fconn);
return NULL;
}
/* callback called on any event by the connection handler.
* It applies changes and returns zero, or < 0 if it wants immediate
* destruction of the connection (which normally doesn not happen in FCGI).
*/
static int fcgi_process(struct fcgi_conn *fconn)
{
struct connection *conn = fconn->conn;
if (b_data(&fconn->dbuf) && !(fconn->flags & FCGI_CF_DEM_BLOCK_ANY)) {
fcgi_process_demux(fconn);
if (fconn->state == FCGI_CS_CLOSED || conn->flags & CO_FL_ERROR)
b_reset(&fconn->dbuf);
if (buf_room_for_htx_data(&fconn->dbuf))
fconn->flags &= ~FCGI_CF_DEM_DFULL;
}
fcgi_send(fconn);
if (unlikely(fconn->proxy->state == PR_STSTOPPED)) {
/* frontend is stopping, reload likely in progress, let's try
* to announce a graceful shutdown if not yet done. We don't
* care if it fails, it will be tried again later.
*/
if (!(fconn->flags & (FCGI_CF_ABRTS_SENT|FCGI_CF_ABRTS_FAILED))) {
if (fconn->stream_cnt - fconn->nb_reserved > 0)
fcgi_conn_send_aborts(fconn);
}
}
/*
* If we received early data, and the handshake is done, wake
* any stream that was waiting for it.
*/
if (!(fconn->flags & FCGI_CF_WAIT_FOR_HS) &&
(conn->flags & (CO_FL_EARLY_SSL_HS | CO_FL_HANDSHAKE | CO_FL_EARLY_DATA)) == CO_FL_EARLY_DATA) {
struct eb32_node *node;
struct fcgi_strm *fstrm;
fconn->flags |= FCGI_CF_WAIT_FOR_HS;
node = eb32_lookup_ge(&fconn->streams_by_id, 1);
while (node) {
fstrm = container_of(node, struct fcgi_strm, by_id);
if (fstrm->cs && fstrm->cs->flags & CS_FL_WAIT_FOR_HS)
fcgi_strm_notify_recv(fstrm);
node = eb32_next(node);
}
}
if ((conn->flags & CO_FL_ERROR) || conn_xprt_read0_pending(conn) ||
fconn->state == FCGI_CS_CLOSED || (fconn->flags & FCGI_CF_ABRTS_FAILED) ||
eb_is_empty(&fconn->streams_by_id)) {
fcgi_wake_some_streams(fconn, 0);
if (eb_is_empty(&fconn->streams_by_id)) {
/* no more stream, kill the connection now */
fcgi_release(fconn);
return -1;
}
}
if (!b_data(&fconn->dbuf))
fcgi_release_buf(fconn, &fconn->dbuf);
if ((conn->flags & CO_FL_SOCK_WR_SH) ||
fconn->state == FCGI_CS_CLOSED || (fconn->flags & FCGI_CF_ABRTS_FAILED) ||
(!br_data(fconn->mbuf) && ((fconn->flags & FCGI_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&fconn->send_list))))
fcgi_release_mbuf(fconn);
if (fconn->task) {
fconn->task->expire = tick_add(now_ms, (fconn->state == FCGI_CS_CLOSED ? fconn->shut_timeout : fconn->timeout));
task_queue(fconn->task);
}
fcgi_send(fconn);
return 0;
}
/* wake-up function called by the connection layer (mux_ops.wake) */
static int fcgi_wake(struct connection *conn)
{
struct fcgi_conn *fconn = conn->ctx;
return (fcgi_process(fconn));
}
/* Connection timeout management. The principle is that if there's no receipt
* nor sending for a certain amount of time, the connection is closed. If the
* MUX buffer still has lying data or is not allocatable, the connection is
* immediately killed. If it's allocatable and empty, we attempt to send a
* GOAWAY frame.
*/
static struct task *fcgi_timeout_task(struct task *t, void *context, unsigned short state)
{
struct fcgi_conn *fconn = context;
int expired = tick_is_expired(t->expire, now_ms);
if (!expired && fconn)
return t;
task_destroy(t);
if (!fconn) {
/* resources were already deleted */
return NULL;
}
fconn->task = NULL;
fconn->state = FCGI_CS_CLOSED;
fcgi_wake_some_streams(fconn, 0);
if (br_data(fconn->mbuf)) {
/* don't even try to send aborts, the buffer is stuck */
fconn->flags |= FCGI_CF_ABRTS_FAILED;
goto end;
}
/* try to send but no need to insist */
if (!fcgi_conn_send_aborts(fconn))
fconn->flags |= FCGI_CF_ABRTS_FAILED;
if (br_data(fconn->mbuf) && !(fconn->flags & FCGI_CF_ABRTS_FAILED) &&
conn_xprt_ready(fconn->conn)) {
unsigned int released = 0;
struct buffer *buf;
for (buf = br_head(fconn->mbuf); b_size(buf); buf = br_del_head(fconn->mbuf)) {
if (b_data(buf)) {
int ret = fconn->conn->xprt->snd_buf(fconn->conn, fconn->conn->xprt_ctx,
buf, b_data(buf), 0);
if (!ret)
break;
b_del(buf, ret);
if (b_data(buf))
break;
b_free(buf);
released++;
}
}
if (released)
offer_buffers(NULL, tasks_run_queue);
}
end:
/* either we can release everything now or it will be done later once
* the last stream closes.
*/
if (eb_is_empty(&fconn->streams_by_id))
fcgi_release(fconn);
return NULL;
}
/*******************************************/
/* functions below are used by the streams */
/*******************************************/
/* Append the description of what is present in error snapshot <es> into <out>.
* The description must be small enough to always fit in a buffer. The output
* buffer may be the trash so the trash must not be used inside this function.
*/
static void fcgi_show_error_snapshot(struct buffer *out, const struct error_snapshot *es)
{
chunk_appendf(out,
" FCGI connection flags 0x%08x, FCGI stream flags 0x%08x\n"
" H1 msg state %s(%d), H1 msg flags 0x%08x\n"
" H1 chunk len %lld bytes, H1 body len %lld bytes :\n",
es->ctx.h1.c_flags, es->ctx.h1.s_flags,
h1m_state_str(es->ctx.h1.state), es->ctx.h1.state,
es->ctx.h1.m_flags, es->ctx.h1.m_clen, es->ctx.h1.m_blen);
}
/*
* Capture a bad response and archive it in the proxy's structure. By default
* it tries to report the error position as h1m->err_pos. However if this one is
* not set, it will then report h1m->next, which is the last known parsing
* point. The function is able to deal with wrapping buffers. It always displays
* buffers as a contiguous area starting at buf->p. The direction is determined
* thanks to the h1m's flags.
*/
static void fcgi_strm_capture_bad_message(struct fcgi_conn *fconn, struct fcgi_strm *fstrm,
struct h1m *h1m, struct buffer *buf)
{
struct session *sess = fstrm->sess;
struct proxy *proxy = fconn->proxy;
struct proxy *other_end = sess->fe;
union error_snapshot_ctx ctx;
/* http-specific part now */
ctx.h1.state = h1m->state;
ctx.h1.c_flags = fconn->flags;
ctx.h1.s_flags = fstrm->flags;
ctx.h1.m_flags = h1m->flags;
ctx.h1.m_clen = h1m->curr_len;
ctx.h1.m_blen = h1m->body_len;
proxy_capture_error(proxy, 1, other_end, fconn->conn->target, sess, buf, 0, 0,
(h1m->err_pos >= 0) ? h1m->err_pos : h1m->next,
&ctx, fcgi_show_error_snapshot);
}
static size_t fcgi_strm_parse_headers(struct fcgi_strm *fstrm, struct h1m *h1m, struct htx *htx,
struct buffer *buf, size_t *ofs, size_t max)
{
int ret;
ret = h1_parse_msg_hdrs(h1m, NULL, htx, buf, *ofs, max);
if (!ret) {
if (htx->flags & HTX_FL_PARSING_ERROR) {
fcgi_strm_error(fstrm);
fcgi_strm_capture_bad_message(fstrm->fconn, fstrm, h1m, buf);
}
goto end;
}
*ofs += ret;
end:
return ret;
}
static size_t fcgi_strm_parse_data(struct fcgi_strm *fstrm, struct h1m *h1m, struct htx *htx,
struct buffer *buf, size_t *ofs, size_t max, struct buffer *htxbuf)
{
int ret;
ret = h1_parse_msg_data(h1m, htx, buf, *ofs, max, htxbuf);
if (ret <= 0) {
if (htx->flags & HTX_FL_PARSING_ERROR) {
fcgi_strm_error(fstrm);
fcgi_strm_capture_bad_message(fstrm->fconn, fstrm, h1m, buf);
}
goto end;
}
*ofs += ret;
end:
return ret;
}
static size_t fcgi_strm_parse_trailers(struct fcgi_strm *fstrm, struct h1m *h1m, struct htx *htx,
struct buffer *buf, size_t *ofs, size_t max)
{
int ret;
ret = h1_parse_msg_tlrs(h1m, htx, buf, *ofs, max);
if (ret <= 0) {
if (htx->flags & HTX_FL_PARSING_ERROR) {
fcgi_strm_error(fstrm);
fcgi_strm_capture_bad_message(fstrm->fconn, fstrm, h1m, buf);
}
goto end;
}
*ofs += ret;
fstrm->flags |= FCGI_SF_HAVE_I_TLR;
end:
return ret;
}
static size_t fcgi_strm_add_eom(struct fcgi_strm *fstrm, struct h1m *h1m, struct htx *htx,
size_t max)
{
if (max < sizeof(struct htx_blk) + 1 || !htx_add_endof(htx, HTX_BLK_EOM))
return 0;
h1m->state = H1_MSG_DONE;
return (sizeof(struct htx_blk) + 1);
}
static size_t fcgi_strm_parse_response(struct fcgi_strm *fstrm, struct buffer *buf, size_t count)
{
struct htx *htx;
struct h1m *h1m = &fstrm->h1m;
size_t ret, data, total = 0;
htx = htx_from_buf(buf);
data = htx->data;
if (fstrm->state == FCGI_SS_ERROR)
goto end;
do {
size_t used = htx_used_space(htx);
if (h1m->state <= H1_MSG_LAST_LF) {
ret = fcgi_strm_parse_headers(fstrm, h1m, htx, &fstrm->rxbuf, &total, count);
if (!ret)
break;
if ((h1m->flags & (H1_MF_VER_11|H1_MF_XFER_LEN)) == H1_MF_VER_11) {
struct htx_blk *blk = htx_get_head_blk(htx);
struct htx_sl *sl;
if (!blk)
break;
sl = htx_get_blk_ptr(htx, blk);
sl->flags |= HTX_SL_F_XFER_LEN;
htx->extra = 0;
}
}
else if (h1m->state < H1_MSG_TRAILERS) {
ret = fcgi_strm_parse_data(fstrm, h1m, htx, &fstrm->rxbuf, &total, count, buf);
htx = htx_from_buf(buf);
if (!ret)
break;
}
else if (h1m->state == H1_MSG_TRAILERS) {
if (!(fstrm->flags & FCGI_SF_HAVE_I_TLR)) {
ret = fcgi_strm_parse_trailers(fstrm, h1m, htx, &fstrm->rxbuf, &total, count);
if (!ret)
break;
}
else if (!fcgi_strm_add_eom(fstrm, h1m, htx, count))
break;
}
else if (h1m->state == H1_MSG_DONE) {
if (b_data(&fstrm->rxbuf) > total) {
htx->flags |= HTX_FL_PARSING_ERROR;
fcgi_strm_error(fstrm);
}
break;
}
else if (h1m->state == H1_MSG_TUNNEL) {
ret = fcgi_strm_parse_data(fstrm, h1m, htx, &fstrm->rxbuf, &total, count, buf);
htx = htx_from_buf(buf);
if (fstrm->state != FCGI_SS_ERROR &&
(fstrm->flags & FCGI_SF_ES_RCVD) && b_data(&fstrm->rxbuf) == total) {
if ((h1m->flags & (H1_MF_VER_11|H1_MF_XFER_LEN)) == H1_MF_VER_11) {
if (!fcgi_strm_add_eom(fstrm, h1m, htx, count))
break;
}
else {
h1m->state = H1_MSG_DONE;
break;
}
}
if (!ret)
break;
}
else {
htx->flags |= HTX_FL_PROCESSING_ERROR;
fcgi_strm_error(fstrm);
break;
}
count -= htx_used_space(htx) - used;
} while (fstrm->state != FCGI_SS_ERROR/* /\*fstrm->state == FCGI_SS_OPEN && *\/count */);
if (fstrm->state == FCGI_SS_ERROR) {
b_reset(&fstrm->rxbuf);
htx_to_buf(htx, buf);
return 0;
}
b_del(&fstrm->rxbuf, total);
end:
htx_to_buf(htx, buf);
ret = htx->data - data;
return ret;
}
/*
* Attach a new stream to a connection
* (Used for outgoing connections)
*/
static struct conn_stream *fcgi_attach(struct connection *conn, struct session *sess)
{
struct conn_stream *cs;
struct fcgi_strm *fstrm;
struct fcgi_conn *fconn = conn->ctx;
cs = cs_new(conn);
if (!cs)
return NULL;
fstrm = fcgi_conn_stream_new(fconn, cs, sess);
if (!fstrm) {
cs_free(cs);
return NULL;
}
return cs;
}
/* Retrieves the first valid conn_stream from this connection, or returns NULL.
* We have to scan because we may have some orphan streams. It might be
* beneficial to scan backwards from the end to reduce the likeliness to find
* orphans.
*/
static const struct conn_stream *fcgi_get_first_cs(const struct connection *conn)
{
struct fcgi_conn *fconn = conn->ctx;
struct fcgi_strm *fstrm;
struct eb32_node *node;
node = eb32_first(&fconn->streams_by_id);
while (node) {
fstrm = container_of(node, struct fcgi_strm, by_id);
if (fstrm->cs)
return fstrm->cs;
node = eb32_next(node);
}
return NULL;
}
/*
* Destroy the mux and the associated connection, if it is no longer used
*/
static void fcgi_destroy(void *ctx)
{
struct fcgi_conn *fconn = ctx;
if (eb_is_empty(&fconn->streams_by_id) || !fconn->conn || fconn->conn->ctx != fconn)
fcgi_release(fconn);
}
/*
* Detach the stream from the connection and possibly release the connection.
*/
static void fcgi_detach(struct conn_stream *cs)
{
struct fcgi_strm *fstrm = cs->ctx;
struct fcgi_conn *fconn;
struct session *sess;
cs->ctx = NULL;
if (!fstrm)
return;
/* The stream is about to die, so no need to attempt to run its task */
if (LIST_ADDED(&fstrm->sending_list) &&
fstrm->send_wait != &fstrm->wait_event) {
tasklet_remove_from_tasklet_list(fstrm->send_wait->tasklet);
LIST_DEL_INIT(&fstrm->sending_list);
/*
* At this point, the stream_interface is supposed to have called
* fcgi_unsubscribe(), so the only way there's still a
* subscription that came from the stream_interface (as we
* can subscribe ourself, in fcgi_do_shutw() and fcgi_do_shutr(),
* without the stream_interface involved) is that we subscribed
* for sending, we woke the tasklet up and removed the
* SUB_RETRY_SEND flag, so the stream_interface would not
* know it has to unsubscribe for send, but the tasklet hasn't
* run yet. Make sure to handle that by explicitely setting
* send_wait to NULL, as nothing else will do it for us.
*/
fstrm->send_wait = NULL;
}
sess = fstrm->sess;
fconn = fstrm->fconn;
fstrm->cs = NULL;
fconn->nb_cs--;
if (fstrm->proto_status == FCGI_PS_CANT_MPX_CONN) {
fconn->flags &= ~FCGI_CF_MPXS_CONNS;
fconn->streams_limit = 1;
}
else if (fstrm->proto_status == FCGI_PS_OVERLOADED ||
fstrm->proto_status == FCGI_PS_UNKNOWN_ROLE) {
fconn->flags &= ~FCGI_CF_KEEP_CONN;
fconn->state = FCGI_CS_CLOSED;
}
/* this stream may be blocked waiting for some data to leave, so orphan
* it in this case.
*/
if (!(cs->conn->flags & CO_FL_ERROR) &&
(fconn->state != FCGI_CS_CLOSED) &&
(fstrm->flags & (FCGI_SF_BLK_MBUSY|FCGI_SF_BLK_MROOM)) && (fstrm->send_wait || fstrm->recv_wait))
return;
if ((fconn->flags & FCGI_CF_DEM_BLOCK_ANY && fstrm->id == fconn->dsi)) {
/* unblock the connection if it was blocked on this stream. */
fconn->flags &= ~FCGI_CF_DEM_BLOCK_ANY;
fcgi_conn_restart_reading(fconn, 1);
}
fcgi_strm_destroy(fstrm);
if (!(fconn->conn->flags & (CO_FL_ERROR|CO_FL_SOCK_RD_SH|CO_FL_SOCK_WR_SH)) &&
!(fconn->flags & FCGI_CF_KEEP_CONN)) {
if (!fconn->conn->owner) {
fconn->conn->owner = sess;
if (!session_add_conn(sess, fconn->conn, fconn->conn->target)) {
fconn->conn->owner = NULL;
if (eb_is_empty(&fconn->streams_by_id)) {
if (!srv_add_to_idle_list(objt_server(fconn->conn->target), fconn->conn))
/* The server doesn't want it, let's kill the connection right away */
fconn->conn->mux->destroy(fconn->conn);
return;
}
}
}
if (eb_is_empty(&fconn->streams_by_id)) {
if (session_check_idle_conn(fconn->conn->owner, fconn->conn) != 0)
/* At this point either the connection is destroyed,
or it's been added to the server idle list, just stop */
return;
}
/* Never ever allow to reuse a connection from a non-reuse backend */
if ((fconn->proxy->options & PR_O_REUSE_MASK) == PR_O_REUSE_NEVR)
fconn->conn->flags |= CO_FL_PRIVATE;
if (!LIST_ADDED(&fconn->conn->list) && fconn->nb_streams < fconn->streams_limit) {
struct server *srv = objt_server(fconn->conn->target);
if (srv) {
if (fconn->conn->flags & CO_FL_PRIVATE)
LIST_ADD(&srv->priv_conns[tid], &fconn->conn->list);
else
LIST_ADD(&srv->idle_conns[tid], &fconn->conn->list);
}
}
}
/* We don't want to close right now unless we're removing the last
* stream, and either the connection is in error, or it reached the ID
* already specified in a GOAWAY frame received or sent (as seen by
* last_sid >= 0).
*/
if (fcgi_conn_is_dead(fconn)) {
/* no more stream will come, kill it now */
fcgi_release(fconn);
}
else if (fconn->task) {
fconn->task->expire = tick_add(now_ms, (fconn->state == FCGI_CS_CLOSED ? fconn->shut_timeout : fconn->timeout));
task_queue(fconn->task);
}
}
/* Performs a synchronous or asynchronous shutr(). */
static void fcgi_do_shutr(struct fcgi_strm *fstrm)
{
struct fcgi_conn *fconn = fstrm->fconn;
struct wait_event *sw = &fstrm->wait_event;
if (fstrm->state == FCGI_SS_CLOSED)
goto done;
/* a connstream may require us to immediately kill the whole connection
* for example because of a "tcp-request content reject" rule that is
* normally used to limit abuse.
*/
if ((fstrm->flags & FCGI_SF_KILL_CONN) &&
!(fconn->flags & (FCGI_CF_ABRTS_SENT|FCGI_CF_ABRTS_FAILED)))
fconn->state = FCGI_CS_CLOSED;
else if (fstrm->flags & FCGI_SF_BEGIN_SENT) {
if (!(fstrm->flags & (FCGI_SF_ES_SENT|FCGI_SF_ABRT_SENT)) &&
!fcgi_strm_send_abort(fconn, fstrm))
goto add_to_list;
}
fcgi_strm_close(fstrm);
if (!(fconn->wait_event.events & SUB_RETRY_SEND))
tasklet_wakeup(fconn->wait_event.tasklet);
done:
fstrm->flags &= ~FCGI_SF_WANT_SHUTR;
return;
add_to_list:
if (!LIST_ADDED(&fstrm->send_list)) {
sw->events |= SUB_RETRY_SEND;
if (fstrm->flags & (FCGI_SF_BLK_MBUSY|FCGI_SF_BLK_MROOM)) {
fstrm->send_wait = sw;
LIST_ADDQ(&fconn->send_list, &fstrm->send_list);
}
}
/* Let the handler know we want shutr */
fstrm->flags |= FCGI_SF_WANT_SHUTR;
return;
}
/* Performs a synchronous or asynchronous shutw(). */
static void fcgi_do_shutw(struct fcgi_strm *fstrm)
{
struct fcgi_conn *fconn = fstrm->fconn;
struct wait_event *sw = &fstrm->wait_event;
if (fstrm->state != FCGI_SS_HLOC || fstrm->state == FCGI_SS_CLOSED)
goto done;
if (fstrm->state != FCGI_SS_ERROR && (fstrm->flags & FCGI_SF_BEGIN_SENT)) {
if (!(fstrm->flags & (FCGI_SF_ES_SENT|FCGI_SF_ABRT_SENT)) &&
!fcgi_strm_send_abort(fconn, fstrm))
goto add_to_list;
if (fstrm->state == FCGI_SS_HREM)
fcgi_strm_close(fstrm);
else
fstrm->state = FCGI_SS_HLOC;
} else {
/* a connstream may require us to immediately kill the whole connection
* for example because of a "tcp-request content reject" rule that is
* normally used to limit abuse.
*/
if ((fstrm->flags & FCGI_SF_KILL_CONN) &&
!(fconn->flags & (FCGI_CF_ABRTS_SENT|FCGI_CF_ABRTS_FAILED)))
fconn->state = FCGI_CS_CLOSED;
fcgi_strm_close(fstrm);
}
if (!(fconn->wait_event.events & SUB_RETRY_SEND))
tasklet_wakeup(fconn->wait_event.tasklet);
done:
fstrm->flags &= ~FCGI_SF_WANT_SHUTW;
return;
add_to_list:
if (!LIST_ADDED(&fstrm->send_list)) {
sw->events |= SUB_RETRY_SEND;
if (fstrm->flags & (FCGI_SF_BLK_MBUSY|FCGI_SF_BLK_MROOM)) {
fstrm->send_wait = sw;
LIST_ADDQ(&fconn->send_list, &fstrm->send_list);
}
}
/* let the handler know we want to shutw */
fstrm->flags |= FCGI_SF_WANT_SHUTW;
return;
}
/* This is the tasklet referenced in fstrm->wait_event.tasklet, it is used for
* deferred shutdowns when the fcgi_detach() was done but the mux buffer was full
* and prevented the last frame from being emitted.
*/
static struct task *fcgi_deferred_shut(struct task *t, void *ctx, unsigned short state)
{
struct fcgi_strm *fstrm = ctx;
struct fcgi_conn *fconn = fstrm->fconn;
LIST_DEL_INIT(&fstrm->sending_list);
if (fstrm->flags & FCGI_SF_WANT_SHUTW)
fcgi_do_shutw(fstrm);
if (fstrm->flags & FCGI_SF_WANT_SHUTR)
fcgi_do_shutr(fstrm);
if (!(fstrm->flags & (FCGI_SF_WANT_SHUTR|FCGI_SF_WANT_SHUTW))) {
/* We're done trying to send, remove ourself from the send_list */
LIST_DEL_INIT(&fstrm->send_list);
if (!fstrm->cs) {
fcgi_strm_destroy(fstrm);
if (fcgi_conn_is_dead(fconn))
fcgi_release(fconn);
}
}
return NULL;
}
/* shutr() called by the conn_stream (mux_ops.shutr) */
static void fcgi_shutr(struct conn_stream *cs, enum cs_shr_mode mode)
{
struct fcgi_strm *fstrm = cs->ctx;
if (cs->flags & CS_FL_KILL_CONN)
fstrm->flags |= FCGI_SF_KILL_CONN;
if (!mode)
return;
fcgi_do_shutr(fstrm);
}
/* shutw() called by the conn_stream (mux_ops.shutw) */
static void fcgi_shutw(struct conn_stream *cs, enum cs_shw_mode mode)
{
struct fcgi_strm *fstrm = cs->ctx;
if (cs->flags & CS_FL_KILL_CONN)
fstrm->flags |= FCGI_SF_KILL_CONN;
fcgi_do_shutw(fstrm);
}
/* Called from the upper layer, to subscribe to events, such as being able to send.
* The <param> argument here is supposed to be a pointer to a wait_event struct
* which will be passed to fstrm->recv_wait or fstrm->send_wait depending on the
* event_type. The event_type must only be a combination of SUB_RETRY_RECV and
* SUB_RETRY_SEND, other values will lead to -1 being returned. It always
* returns 0 except for the error above.
*/
static int fcgi_subscribe(struct conn_stream *cs, int event_type, void *param)
{
struct wait_event *sw;
struct fcgi_strm *fstrm = cs->ctx;
struct fcgi_conn *fconn = fstrm->fconn;
if (event_type & SUB_RETRY_RECV) {
sw = param;
BUG_ON(fstrm->recv_wait != NULL || (sw->events & SUB_RETRY_RECV));
sw->events |= SUB_RETRY_RECV;
fstrm->recv_wait = sw;
event_type &= ~SUB_RETRY_RECV;
}
if (event_type & SUB_RETRY_SEND) {
sw = param;
BUG_ON(fstrm->send_wait != NULL || (sw->events & SUB_RETRY_SEND));
sw->events |= SUB_RETRY_SEND;
fstrm->send_wait = sw;
if (!LIST_ADDED(&fstrm->send_list))
LIST_ADDQ(&fconn->send_list, &fstrm->send_list);
event_type &= ~SUB_RETRY_SEND;
}
if (event_type != 0)
return -1;
return 0;
}
/* Called from the upper layer, to unsubscribe some events (undo fcgi_subscribe).
* The <param> argument here is supposed to be a pointer to the same wait_event
* struct that was passed to fcgi_subscribe() otherwise nothing will be changed.
* It always returns zero.
*/
static int fcgi_unsubscribe(struct conn_stream *cs, int event_type, void *param)
{
struct wait_event *sw;
struct fcgi_strm *fstrm = cs->ctx;
if (event_type & SUB_RETRY_RECV) {
sw = param;
BUG_ON(fstrm->recv_wait != sw);
sw->events &= ~SUB_RETRY_RECV;
fstrm->recv_wait = NULL;
}
if (event_type & SUB_RETRY_SEND) {
sw = param;
BUG_ON(fstrm->send_wait != sw);
LIST_DEL(&fstrm->send_list);
LIST_INIT(&fstrm->send_list);
sw->events &= ~SUB_RETRY_SEND;
/* We were about to send, make sure it does not happen */
if (LIST_ADDED(&fstrm->sending_list) && fstrm->send_wait != &fstrm->wait_event) {
tasklet_remove_from_tasklet_list(fstrm->send_wait->tasklet);
LIST_DEL_INIT(&fstrm->sending_list);
}
fstrm->send_wait = NULL;
}
return 0;
}
/* Called from the upper layer, to receive data */
static size_t fcgi_rcv_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
{
struct fcgi_strm *fstrm = cs->ctx;
struct fcgi_conn *fconn = fstrm->fconn;
size_t ret = 0;
if (!(fconn->flags & FCGI_CF_DEM_SALLOC))
ret = fcgi_strm_parse_response(fstrm, buf, count);
if (b_data(&fstrm->rxbuf))
cs->flags |= (CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
else {
cs->flags &= ~(CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
if (fstrm->state == FCGI_SS_ERROR || fstrm->h1m.state == H1_MSG_DONE) {
cs->flags |= CS_FL_EOI;
if (!(fstrm->h1m.flags & (H1_MF_VER_11|H1_MF_XFER_LEN)))
cs->flags |= CS_FL_EOS;
}
if (conn_xprt_read0_pending(fconn->conn))
cs->flags |= CS_FL_EOS;
if (cs->flags & CS_FL_ERR_PENDING)
cs->flags |= CS_FL_ERROR;
fcgi_release_buf(fconn, &fstrm->rxbuf);
}
if (ret && fconn->dsi == fstrm->id) {
/* demux is blocking on this stream's buffer */
fconn->flags &= ~FCGI_CF_DEM_SFULL;
fcgi_conn_restart_reading(fconn, 1);
}
return ret;
}
/* stops all senders of this connection for example when the mux buffer is full.
* They are moved from the sending_list to send_list.
*/
static void fcgi_stop_senders(struct fcgi_conn *fconn)
{
struct fcgi_strm *fstrm, *fstrm_back;
list_for_each_entry_safe(fstrm, fstrm_back, &fconn->sending_list, sending_list) {
LIST_DEL_INIT(&fstrm->sending_list);
tasklet_remove_from_tasklet_list(fstrm->send_wait->tasklet);
fstrm->send_wait->events |= SUB_RETRY_SEND;
}
}
/* Called from the upper layer, to send data from buffer <buf> for no more than
* <count> bytes. Returns the number of bytes effectively sent. Some status
* flags may be updated on the conn_stream.
*/
static size_t fcgi_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
{
struct fcgi_strm *fstrm = cs->ctx;
struct fcgi_conn *fconn = fstrm->fconn;
size_t total = 0;
size_t ret;
struct htx *htx = NULL;
struct htx_sl *sl;
struct htx_blk *blk;
uint32_t bsize;
/* If we were not just woken because we wanted to send but couldn't,
* and there's somebody else that is waiting to send, do nothing,
* we will subscribe later and be put at the end of the list
*/
if (!LIST_ADDED(&fstrm->sending_list) && !LIST_ISEMPTY(&fconn->send_list))
return 0;
LIST_DEL_INIT(&fstrm->sending_list);
/* We couldn't set it to NULL before, because we needed it in case
* we had to cancel the tasklet
*/
fstrm->send_wait = NULL;
if (fconn->state < FCGI_CS_RECORD_H)
return 0;
htx = htxbuf(buf);
if (fstrm->id == 0) {
int32_t id = fcgi_conn_get_next_sid(fconn);
if (id < 0) {
fcgi_strm_close(fstrm);
cs->flags |= CS_FL_ERROR;
return 0;
}
eb32_delete(&fstrm->by_id);
fstrm->by_id.key = fstrm->id = id;
fconn->max_id = id;
fconn->nb_reserved--;
eb32_insert(&fconn->streams_by_id, &fstrm->by_id);
/* Check if length of the body is known or if the message is
* full. Otherwise, the request is invalid.
*/
sl = http_get_stline(htx);
if (!sl || (!(sl->flags & HTX_SL_F_CLEN) && (htx_get_tail_type(htx) != HTX_BLK_EOM))) {
htx->flags |= HTX_FL_PARSING_ERROR;
fcgi_strm_error(fstrm);
goto done;
}
}
if (!(fstrm->flags & FCGI_SF_BEGIN_SENT)) {
if (!fcgi_strm_send_begin_request(fconn, fstrm))
goto done;
}
if (!(fstrm->flags & FCGI_SF_OUTGOING_DATA) && count)
fstrm->flags |= FCGI_SF_OUTGOING_DATA;
while (fstrm->state < FCGI_SS_HLOC && !(fconn->flags & FCGI_SF_BLK_ANY) &&
count && !htx_is_empty(htx)) {
blk = htx_get_head_blk(htx);
ALREADY_CHECKED(blk);
bsize = htx_get_blksz(blk);
switch (htx_get_blk_type(blk)) {
case HTX_BLK_REQ_SL:
case HTX_BLK_HDR:
ret = fcgi_strm_send_params(fconn, fstrm, htx);
if (!ret) {
goto done;
}
total += ret;
count -= ret;
break;
case HTX_BLK_EOH:
ret = fcgi_strm_send_empty_params(fconn, fstrm);
if (!ret)
goto done;
goto remove_blk;
case HTX_BLK_DATA:
ret = fcgi_strm_send_stdin(fconn, fstrm, htx, count, buf);
if (ret > 0) {
htx = htx_from_buf(buf);
total += ret;
count -= ret;
if (ret < bsize)
goto done;
}
break;
case HTX_BLK_EOM:
ret = fcgi_strm_send_empty_stdin(fconn, fstrm);
if (!ret)
goto done;
goto remove_blk;
default:
remove_blk:
htx_remove_blk(htx, blk);
total += bsize;
count -= bsize;
break;
}
}
done:
if (fstrm->state >= FCGI_SS_HLOC) {
/* trim any possibly pending data after we close (extra CR-LF,
* unprocessed trailers, abnormal extra data, ...)
*/
total += count;
count = 0;
}
if (fstrm->state == FCGI_SS_ERROR) {
cs_set_error(cs);
if (!(fstrm->flags & FCGI_SF_BEGIN_SENT) || fcgi_strm_send_abort(fconn, fstrm))
fcgi_strm_close(fstrm);
}
if (htx)
htx_to_buf(htx, buf);
/* The mux is full, cancel the pending tasks */
if ((fconn->flags & FCGI_CF_MUX_BLOCK_ANY) || (fstrm->flags & FCGI_SF_BLK_MBUSY))
fcgi_stop_senders(fconn);
if (total > 0) {
if (!(fconn->wait_event.events & SUB_RETRY_SEND))
tasklet_wakeup(fconn->wait_event.tasklet);
/* Ok we managed to send something, leave the send_list */
LIST_DEL_INIT(&fstrm->send_list);
}
return total;
}
/* for debugging with CLI's "show fd" command */
static void fcgi_show_fd(struct buffer *msg, struct connection *conn)
{
struct fcgi_conn *fconn = conn->ctx;
struct fcgi_strm *fstrm = NULL;
struct eb32_node *node;
int send_cnt = 0;
int tree_cnt = 0;
int orph_cnt = 0;
struct buffer *hmbuf, *tmbuf;
if (!fconn)
return;
list_for_each_entry(fstrm, &fconn->send_list, send_list)
send_cnt++;
fstrm = NULL;
node = eb32_first(&fconn->streams_by_id);
while (node) {
fstrm = container_of(node, struct fcgi_strm, by_id);
tree_cnt++;
if (!fstrm->cs)
orph_cnt++;
node = eb32_next(node);
}
hmbuf = br_head(fconn->mbuf);
tmbuf = br_tail(fconn->mbuf);
chunk_appendf(msg, " fconn.st0=%d .maxid=%d .flg=0x%04x .nbst=%u"
" .nbcs=%u .send_cnt=%d .tree_cnt=%d .orph_cnt=%d .sub=%d "
".dsi=%d .dbuf=%u@%p+%u/%u .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
fconn->state, fconn->max_id, fconn->flags,
fconn->nb_streams, fconn->nb_cs, send_cnt, tree_cnt, orph_cnt,
fconn->wait_event.events, fconn->dsi,
(unsigned int)b_data(&fconn->dbuf), b_orig(&fconn->dbuf),
(unsigned int)b_head_ofs(&fconn->dbuf), (unsigned int)b_size(&fconn->dbuf),
br_head_idx(fconn->mbuf), br_tail_idx(fconn->mbuf), br_size(fconn->mbuf),
(unsigned int)b_data(hmbuf), b_orig(hmbuf),
(unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
(unsigned int)b_data(tmbuf), b_orig(tmbuf),
(unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
if (fstrm) {
chunk_appendf(msg, " last_fstrm=%p .id=%d .flg=0x%04x .rxbuf=%u@%p+%u/%u .cs=%p",
fstrm, fstrm->id, fstrm->flags,
(unsigned int)b_data(&fstrm->rxbuf), b_orig(&fstrm->rxbuf),
(unsigned int)b_head_ofs(&fstrm->rxbuf), (unsigned int)b_size(&fstrm->rxbuf),
fstrm->cs);
if (fstrm->cs)
chunk_appendf(msg, " .cs.flg=0x%08x .cs.data=%p",
fstrm->cs->flags, fstrm->cs->data);
}
}
/****************************************/
/* MUX initialization and instanciation */
/****************************************/
/* The mux operations */
static const struct mux_ops mux_fcgi_ops = {
.init = fcgi_init,
.wake = fcgi_wake,
.attach = fcgi_attach,
.get_first_cs = fcgi_get_first_cs,
.detach = fcgi_detach,
.destroy = fcgi_destroy,
.avail_streams = fcgi_avail_streams,
.used_streams = fcgi_used_streams,
.rcv_buf = fcgi_rcv_buf,
.snd_buf = fcgi_snd_buf,
.subscribe = fcgi_subscribe,
.unsubscribe = fcgi_unsubscribe,
.shutr = fcgi_shutr,
.shutw = fcgi_shutw,
.show_fd = fcgi_show_fd,
.flags = MX_FL_HTX,
.name = "FCGI",
};
/* this mux registers FCGI proto */
static struct mux_proto_list mux_proto_fcgi =
{ .token = IST("fcgi"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BE, .mux = &mux_fcgi_ops };
INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_fcgi);
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/