/*-

 * Copyright (c) 2006 Verdens Gang AS

 * Copyright (c) 2006-2015 Varnish Software AS

 * All rights reserved.

 *

 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 * Stuff that should *never* be exposed to a VMOD

 */

#include "cache.h"

#include "vsb.h"

#include <sys/socket.h>

#include <string.h>

#include <limits.h>

#include <unistd.h>

#include "common/common_param.h"

#ifdef NOT_IN_A_VMOD

#  include "VSC_main.h"

#endif

/*--------------------------------------------------------------------*/

struct vfp;

struct vdp;

struct cli_proto;

struct poolparam;

/*--------------------------------------------------------------------*/

typedef enum req_fsm_nxt req_state_f(struct worker *, struct req *);

struct req_step {

  const char  *name;

  req_state_f *func;

};

extern const struct req_step R_STP_TRANSPORT[1];

extern const struct req_step R_STP_RECV[1];

struct vxid_pool {

  uint64_t    next;

  uint32_t    count;

};

/*--------------------------------------------------------------------

 * Private part of worker threads

 */

struct worker_priv {

  unsigned    magic;

#define WORKER_PRIV_MAGIC 0x3047db99

  struct objhead    *nobjhead;

  struct objcore    *nobjcore;

  void      *nhashpriv;

  struct vxid_pool  vxid_pool[1];

  struct vcl    *vcl;

};

/*--------------------------------------------------------------------

 * HTTP Protocol connection structure

 *

 * This is the protocol independent object for a HTTP connection, used

 * both for backend and client sides.

 *

 */

struct http_conn {

  unsigned    magic;

#define HTTP_CONN_MAGIC   0x3e19edd1

  int     *rfd;

  stream_close_t    doclose;

  body_status_t   body_status;

  struct ws   *ws;

  char      *rxbuf_b;

  char      *rxbuf_e;

  char      *pipeline_b;

  char      *pipeline_e;

  ssize_t     content_length;

  void      *priv;

  /* Timeouts */

  vtim_dur    first_byte_timeout;

  vtim_dur    between_bytes_timeout;

};

enum htc_status_e {

#define HTC_STATUS(e, n, s, l) HTC_S_ ## e = n,

#include "tbl/htc.h"

};

typedef enum htc_status_e htc_complete_f(struct http_conn *);

/* -------------------------------------------------------------------*/

extern volatile struct params * cache_param;

/* -------------------------------------------------------------------

 * The VCF facility is deliberately undocumented, use at your peril.

 */

struct vcf_return {

  const char    *name;

};

#define VCF_RETURNS() \

    VCF_RETURN(CONTINUE) \

    VCF_RETURN(DEFAULT) \

    VCF_RETURN(MISS) \

    VCF_RETURN(HIT)

#define VCF_RETURN(x) extern const struct vcf_return VCF_##x[1];

VCF_RETURNS()

#undef VCF_RETURN

typedef const struct vcf_return *vcf_func_f(

  struct req *req,

  struct objcore **oc,

  struct objcore **oc_exp,

  int state);

struct vcf {

  unsigned    magic;

#define VCF_MAGIC   0x183285d1

  vcf_func_f    *func;

  void      *priv;

};

/* Prototypes etc ----------------------------------------------------*/

/* cache_backend.c */

struct backend;

/* cache_backend_cfg.c */

void VBE_InitCfg(void);

/* cache_ban.c */

/* for stevedoes resurrecting bans */

void BAN_Hold(void);

void BAN_Release(void);

void BAN_Reload(const uint8_t *ban, unsigned len);

struct ban *BAN_FindBan(vtim_real t0);

void BAN_RefBan(struct objcore *oc, struct ban *);

vtim_real BAN_Time(const struct ban *ban);

/* cache_busyobj.c */

struct busyobj *VBO_GetBusyObj(const struct worker *, const struct req *);

void VBO_ReleaseBusyObj(struct worker *wrk, struct busyobj **busyobj);

void VBO_SetState(struct worker *wrk, struct busyobj *bo,

    enum boc_state_e next);

/* cache_director.c */

int VDI_GetHdr(struct busyobj *);

VCL_IP VDI_GetIP(struct busyobj *);

void VDI_Finish(struct busyobj *bo);

stream_close_t VDI_Http1Pipe(struct req *, struct busyobj *);

void VDI_Panic(const struct director *, struct vsb *, const char *nm);

void VDI_Event(const struct director *d, enum vcl_event_e ev);

void VDI_Init(void);

/* cache_deliver_proc.c */

void VDP_Fini(const struct vdp_ctx *vdc);

void VDP_Init(struct vdp_ctx *vdc, struct worker *wrk, struct vsl_log *vsl,

    const struct req *req, const struct busyobj *bo, intmax_t *cl);

uint64_t VDP_Close(struct vdp_ctx *, struct objcore *, struct boc *);

void VDP_Panic(struct vsb *vsb, const struct vdp_ctx *vdc);

int VDP_Push(VRT_CTX, struct vdp_ctx *, struct ws *, const struct vdp *,

    void *priv);

int VDP_ObjIterate(void *priv, unsigned flush, const void *ptr, ssize_t len);

int VDP_DeliverObj(struct vdp_ctx *vdc, struct objcore *oc);

extern const struct vdp VDP_gunzip;

extern const struct vdp VDP_esi;

extern const struct vdp VDP_range;

uint64_t VDPIO_Close(struct vdp_ctx *, struct objcore *, struct boc *);

int VDPIO_Upgrade(VRT_CTX, struct vdp_ctx *vdc);

int VDPIO_Push(VRT_CTX, struct vdp_ctx *, struct ws *, const struct vdp *,

    void *priv);

/* cache_exp.c */

vtim_real EXP_Ttl(const struct req *, const struct objcore *);

vtim_real EXP_Ttl_grace(const struct req *, const struct objcore *oc);

void EXP_RefNewObjcore(struct objcore *);

void EXP_Insert(struct worker *wrk, struct objcore *oc);

void EXP_Remove(struct objcore *, const struct objcore *);

#define EXP_Dttl(req, oc) (oc->ttl - (req->t_req - oc->t_origin))

/* cache_expire.c */

/*

 * The set of variables which control object expiry are inconveniently

 * 24 bytes long (double+3*float) and this causes alignment waste if

 * we put then in a struct.

 * These three macros operate on the struct we don't use.

 */

#define EXP_ZERO(xx)              \

  do {                \

    (xx)->t_origin = 0.0;         \

    (xx)->ttl = 0.0;          \

    (xx)->grace = 0.0;          \

    (xx)->keep = 0.0;         \

  } while (0)

#define EXP_COPY(to,fm)             \

  do {                \

    (to)->t_origin = (fm)->t_origin;      \

    (to)->ttl = (fm)->ttl;          \

    (to)->grace = (fm)->grace;        \

    (to)->keep = (fm)->keep;        \

  } while (0)

#define EXP_WHEN(to)              \

  ((to)->t_origin + (to)->ttl + (to)->grace + (to)->keep)

/* cache_exp.c */

void EXP_Rearm(struct objcore *oc, vtim_real now,

    vtim_dur ttl, vtim_dur grace, vtim_dur keep);

void EXP_Reduce(struct objcore *oc, vtim_real now,

    vtim_dur ttl, vtim_dur grace, vtim_dur keep);

/* From cache_main.c */

void BAN_Init(void);

void BAN_Compile(void);

void BAN_Shutdown(void);

/* From cache_hash.c */

void BAN_NewObjCore(struct objcore *oc);

void BAN_DestroyObj(struct objcore *oc);

int BAN_CheckObject(struct worker *, struct objcore *, struct req *);

/* cache_busyobj.c */

void VBO_Init(void);

/* cache_cli.c [CLI] */

void CLI_Init(void);

void CLI_Run(void);

void CLI_AddFuncs(struct cli_proto *p);

/* cache_expire.c */

void EXP_Init(void);

void EXP_Shutdown(void);

/* cache_fetch.c */

enum vbf_fetch_mode_e {

  VBF_NORMAL = 0,

  VBF_PASS = 1,

  VBF_BACKGROUND = 2,

};

void VBF_Fetch(struct worker *wrk, struct req *req,

    struct objcore *oc, struct objcore *oldoc, enum vbf_fetch_mode_e);

const char *VBF_Get_Filter_List(struct busyobj *);

void Bereq_Rollback(VRT_CTX);

/* cache_fetch_proc.c */

void VFP_Init(void);

struct vfp_entry *VFP_Push(struct vfp_ctx *, const struct vfp *);

enum vfp_status VFP_GetStorage(struct vfp_ctx *, ssize_t *sz, uint8_t **ptr);

void VFP_Extend(const struct vfp_ctx *, ssize_t sz, enum vfp_status);

void VFP_Setup(struct vfp_ctx *vc, struct worker *wrk);

int VFP_Open(VRT_CTX, struct vfp_ctx *);

uint64_t VFP_Close(struct vfp_ctx *);

extern const struct vfp VFP_gunzip;

extern const struct vfp VFP_gzip;

extern const struct vfp VFP_testgunzip;

extern const struct vfp VFP_esi;

extern const struct vfp VFP_esi_gzip;

/* cache_http.c */

void HTTP_Init(void);

/* cache_http1_proto.c */

htc_complete_f HTTP1_Complete;

uint16_t HTTP1_DissectRequest(struct http_conn *, struct http *);

uint16_t HTTP1_DissectResponse(struct http_conn *, struct http *resp,

    const struct http *req);

struct v1l;

unsigned HTTP1_Write(struct v1l *v1l, const struct http *hp, const int*);

/* cache_main.c */

vxid_t VXID_Get(const struct worker *, uint64_t marker);

extern pthread_key_t panic_key;

extern pthread_key_t witness_key;

void THR_SetName(const char *name);

const char* THR_GetName(void);

void THR_SetBusyobj(const struct busyobj *);

struct busyobj * THR_GetBusyobj(void);

void THR_SetRequest(const struct req *);

struct req * THR_GetRequest(void);

void THR_SetWorker(const struct worker *);

struct worker * THR_GetWorker(void);

void THR_Init(void);

/* cache_lck.c */

void LCK_Init(void);

/* cache_mempool.c */

void MPL_AssertSane(const void *item);

struct mempool * MPL_New(const char *name, volatile struct poolparam *pp,

    volatile unsigned *cur_size);

void MPL_Destroy(struct mempool **mpp);

void *MPL_Get(struct mempool *mpl, unsigned *size);

void MPL_Free(struct mempool *mpl, void *item);

/* cache_obj.c */

void ObjInit(void);

struct objcore * ObjNew(const struct worker *);

void ObjDestroy(const struct worker *, struct objcore **);

int ObjGetSpace(struct worker *, struct objcore *, ssize_t *sz, uint8_t **ptr);

void ObjExtend(struct worker *, struct objcore *, ssize_t l, int final);

uint64_t ObjWaitExtend(const struct worker *, const struct objcore *,

    uint64_t l, enum boc_state_e *statep);

void ObjSetState(struct worker *, struct objcore *, enum boc_state_e next,

    unsigned broadcast);

void ObjWaitState(const struct objcore *, enum boc_state_e want);

void ObjTouch(struct worker *, struct objcore *, vtim_real now);

void ObjFreeObj(struct worker *, struct objcore *);

void ObjSlim(struct worker *, struct objcore *);

void *ObjSetAttr(struct worker *, struct objcore *, enum obj_attr,

    ssize_t len, const void *);

int ObjCopyAttr(struct worker *, struct objcore *, struct objcore *,

    enum obj_attr attr);

void ObjBocDone(struct worker *, struct objcore *, struct boc **);

// VAI

uint64_t ObjVAIGetExtend(struct worker *, const struct objcore *, uint64_t,

    enum boc_state_e *, struct vai_qe *);

void ObjVAICancel(struct worker *, struct boc *, struct vai_qe *);

int ObjSetDouble(struct worker *, struct objcore *, enum obj_attr, double);

int ObjSetU64(struct worker *, struct objcore *, enum obj_attr, uint64_t);

int ObjSetXID(struct worker *, struct objcore *, vxid_t);

void ObjSetFlag(struct worker *, struct objcore *, enum obj_flags of, int val);

void ObjSendEvent(struct worker *, struct objcore *oc, unsigned event);

#define OEV_INSERT  (1U<<1)

#define OEV_BANCHG  (1U<<2)

#define OEV_TTLCHG  (1U<<3)

#define OEV_EXPIRE  (1U<<4)

#define OEV_MASK (OEV_INSERT|OEV_BANCHG|OEV_TTLCHG|OEV_EXPIRE)

typedef void obj_event_f(struct worker *, void *priv, struct objcore *,

    unsigned);

uintptr_t ObjSubscribeEvents(obj_event_f *, void *, unsigned mask);

void ObjUnsubscribeEvents(uintptr_t *);

/* cache_panic.c */

void PAN_Init(void);

int PAN__DumpStruct(struct vsb *vsb, int block, int track, const void *ptr,

    const char *smagic, unsigned magic, const char *fmt, ...)

    v_printflike_(7,8);

#define PAN_CheckMagic(vsb, ptr, exp)         \

  do {                \

    if ((ptr)->magic != (exp))        \

      VSB_printf((vsb),       \

          "MAGIC at %p is 0x%08x (Should be: %s/0x%08x)\n", \

          ptr, (ptr)->magic, #exp, exp);    \

  } while(0)

#define PAN_dump_struct(vsb, ptr, magic, ...)   \

    PAN__DumpStruct(vsb, 1, 1, ptr, #magic, magic, __VA_ARGS__)

#define PAN_dump_oneline(vsb, ptr, magic, ...)    \

    PAN__DumpStruct(vsb, 0, 1, ptr, #magic, magic, __VA_ARGS__)

#define PAN_dump_once(vsb, ptr, magic, ...)   \

    PAN__DumpStruct(vsb, 1, 0, ptr, #magic, magic, __VA_ARGS__)

#define PAN_dump_once_oneline(vsb, ptr, magic, ...)   \

    PAN__DumpStruct(vsb, 0, 0, ptr, #magic, magic, __VA_ARGS__)

/* cache_pool.c */

void Pool_Init(void);

int Pool_Task(struct pool *pp, struct pool_task *task, enum task_prio prio);

int Pool_Task_Arg(struct worker *, enum task_prio, task_func_t *,

    const void *arg, size_t arg_len);

void Pool_Sumstat(const struct worker *w);

int Pool_TrySumstat(const struct worker *wrk);

void Pool_PurgeStat(unsigned nobj);

int Pool_Task_Any(struct pool_task *task, enum task_prio prio);

void pan_pool(struct vsb *);

/* cache_range.c */

int VRG_CheckBo(struct busyobj *);

/* cache_req.c */

struct req *Req_New(struct sess *, const struct req *);

void Req_Release(struct req *);

void Req_Rollback(VRT_CTX);

void Req_Cleanup(struct sess *sp, struct worker *wrk, struct req *req);

void Req_Fail(struct req *req, stream_close_t reason);

void Req_AcctLogCharge(struct VSC_main_wrk *, struct req *);

void Req_LogHit(struct worker *, struct req *, struct objcore *, intmax_t);

const char *Req_LogStart(const struct worker *, struct req *);

/* cache_req_body.c */

int VRB_Ignore(struct req *);

ssize_t VRB_Cache(struct req *, ssize_t maxsize);

void VRB_Free(struct req *);

/* cache_req_fsm.c [CNT] */

int Resp_Setup_Deliver(struct req *);

void Resp_Setup_Synth(struct req *);

enum req_fsm_nxt {

  REQ_FSM_MORE,

  REQ_FSM_DONE,

  REQ_FSM_DISEMBARK,

};

void CNT_Embark(struct worker *, struct req *);

enum req_fsm_nxt CNT_Request(struct req *);

/* cache_session.c */

void SES_NewPool(struct pool *, unsigned pool_no);

void SES_DestroyPool(struct pool *);

void SES_Wait(struct sess *, const struct transport *);

void SES_Ref(struct sess *sp);

void SES_Rel(struct sess *sp);

void HTC_Status(enum htc_status_e, const char **, const char **);

void HTC_RxInit(struct http_conn *htc, struct ws *ws);

void HTC_RxPipeline(struct http_conn *htc, char *);

enum htc_status_e HTC_RxStuff(struct http_conn *, htc_complete_f *,

    vtim_real *t1, vtim_real *t2, vtim_real ti, vtim_real tn, vtim_dur td,

    int maxbytes);

#define SESS_ATTR(UP, low, typ, len)          \

  int SES_Set_##low(const struct sess *sp, const typ *src); \

  int SES_Reserve_##low(struct sess *sp, typ **dst, ssize_t *sz);

#include "tbl/sess_attr.h"

int SES_Set_String_Attr(struct sess *sp, enum sess_attr a, const char *src);

/* cache_shmlog.c */

extern struct VSC_main *VSC_C_main;

void VSM_Init(void);

void VSL_Setup(struct vsl_log *vsl, void *ptr, size_t len);

void VSL_ChgId(struct vsl_log *vsl, const char *typ, const char *why,

    vxid_t vxid);

void VSL_End(struct vsl_log *vsl);

void VSL_Flush(struct vsl_log *, int overflow);

/* cache_conn_pool.c */

struct conn_pool;

void VCP_Init(void);

void VCP_Panic(struct vsb *, struct conn_pool *);

void VCP_RelPoll(void);

/* cache_backend_probe.c */

void VBP_Init(void);

/* cache_vary.c */

int VRY_Create(struct busyobj *bo, struct vsb **psb);

int VRY_Match(const struct req *, const uint8_t *vary);

void VRY_Prep(struct req *);

void VRY_Clear(struct req *);

enum vry_finish_flag { KEEP, DISCARD };

void VRY_Finish(struct req *req, enum vry_finish_flag);

/* cache_vcl.c */

void VCL_Bo2Ctx(struct vrt_ctx *, struct busyobj *);

void VCL_Req2Ctx(struct vrt_ctx *, struct req *);

struct vrt_ctx *VCL_Get_CliCtx(int);

struct vsb *VCL_Rel_CliCtx(struct vrt_ctx **);

void VCL_Panic(struct vsb *, const char *nm, const struct vcl *);

void VCL_Poll(void);

void VCL_Init(void);

void VCL_Shutdown(void);

#define VCL_MET_MAC(l,u,t,b) \

    void VCL_##l##_method(struct vcl *, struct worker *, struct req *, \

  struct busyobj *bo, void *specific);

#include "tbl/vcl_returns.h"

typedef int vcl_be_func(struct cli *, struct director *, void *);

int VCL_IterDirector(struct cli *, const char *, vcl_be_func *, void *);

/* cache_vrt.c */

void pan_privs(struct vsb *, const struct vrt_privs *);

/* cache_vrt_filter.c */

int VCL_StackVFP(struct vfp_ctx *, const struct vcl *, const char *);

int VCL_StackVDP(struct vdp_ctx *vdc, const struct vcl *vcl, const char *fl,

    struct req *req, struct busyobj *bo);

const char *resp_Get_Filter_List(struct req *req);

void VCL_VRT_Init(void);

/* cache_vrt_vcl.c */

const char *VCL_Return_Name(unsigned);

const char *VCL_Method_Name(unsigned);

void VCL_Refresh(struct vcl **);

void VCL_Recache(const struct worker *, struct vcl **);

void VCL_Ref(struct vcl *);

void VCL_Rel(struct vcl **);

VCL_BACKEND VCL_DefaultDirector(const struct vcl *);

const struct vrt_backend_probe *VCL_DefaultProbe(const struct vcl *);

/* cache_vrt_priv.c */

extern struct vrt_privs cli_task_privs[1];

void VCL_TaskEnter(struct vrt_privs *);

void VCL_TaskLeave(VRT_CTX, struct vrt_privs *);

/* cache_vrt_vmod.c */

void VMOD_Init(void);

void VMOD_Panic(struct vsb *);

#if defined(ENABLE_COVERAGE) || defined(ENABLE_SANITIZER)

#  define DONT_DLCLOSE_VMODS

#endif

/* cache_wrk.c */

void WRK_Init(void);

void WRK_AddStat(const struct worker *);

void WRK_Log(enum VSL_tag_e, const char *, ...);

/* cache_vpi.c */

extern const size_t vpi_wrk_len;

void VPI_wrk_init(struct worker *, void *, size_t);

void VPI_Panic(struct vsb *, const struct wrk_vpi *, const struct vcl *);

/* cache_ws.c */

void WS_Panic(struct vsb *, const struct ws *);

static inline int

WS_IsReserved(const struct ws *ws)

{

  return (ws->r != NULL);

}

Unexecuted instantiation: cache_ws_emu.c:WS_IsReserved

Unexecuted instantiation: cache_ws_common.c:WS_IsReserved

Unexecuted instantiation: cache_esi_parse.c:WS_IsReserved

Unexecuted instantiation: esi_parse_fuzzer.c:WS_IsReserved

void *WS_AtOffset(const struct ws *ws, unsigned off, unsigned len);

unsigned WS_ReservationOffset(const struct ws *ws);

int WS_Pipeline(struct ws *, const void *b, const void *e, unsigned rollback);

/* cache_ws_common.c */

void WS_Id(const struct ws *ws, char *id);

void WS_Rollback(struct ws *, uintptr_t);

/* http1/cache_http1_pipe.c */

void V1P_Init(void);

/* cache_http2_deliver.c */

void V2D_Init(void);

/* stevedore.c */

void STV_open(void);

void STV_warn(void);

void STV_close(void);

const struct stevedore *STV_next(void);

int STV_BanInfoDrop(const uint8_t *ban, unsigned len);

int STV_BanInfoNew(const uint8_t *ban, unsigned len);

void STV_BanExport(const uint8_t *banlist, unsigned len);

// STV_NewObject() len is space for OBJ_VARATTR

int STV_NewObject(struct worker *, struct objcore *,

    const struct stevedore *, unsigned len);

struct stv_buffer;

struct stv_buffer *STV_AllocBuf(struct worker *wrk, const struct stevedore *stv,

    size_t size);

void STV_FreeBuf(struct worker *wrk, struct stv_buffer **pstvbuf);

void *STV_GetBufPtr(struct stv_buffer *stvbuf, size_t *psize);

#ifdef WITH_PERSISTENT_STORAGE

/* storage_persistent.c */

void SMP_Ready(void);

#endif

#define FEATURE(x)  COM_FEATURE(cache_param->feature_bits, x)

#define EXPERIMENT(x) COM_EXPERIMENT(cache_param->experimental_bits, x)

#define DO_DEBUG(x) COM_DO_DEBUG(cache_param->debug_bits, x)

#define DSL(debug_bit, id, ...)         \

  do {              \

    if (DO_DEBUG(debug_bit))      \

      VSL(SLT_Debug, (id), __VA_ARGS__);  \

  } while (0)

#define DSLb(debug_bit, ...)          \

  do {             \

    if (DO_DEBUG(debug_bit))      \

      WRK_Log(SLT_Debug, __VA_ARGS__); \

  } while (0)