/*-

 * Copyright (c) 2018 Varnish Software AS

 * All rights reserved.

 *

 * Author: Federico G. Schwindt <fgsch@lodoss.net>

 *

 * 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.

 *

 * ESI parser fuzzer.

 */

#include "config.h"

#include <string.h>

#include <stdlib.h>

#include <stdio.h>

#include "cache/cache_varnishd.h"

#include "cache/cache_vgz.h"    /* enum vgz_flag */

#include "cache/cache_esi.h"

#include "cache/cache_filter.h"   /* struct vfp_ctx */

#include "cache/cache_obj.h"    /* cache_filter.h uses ObjVAI */

#include "vfil.h"

int LLVMFuzzerTestOneInput(const uint8_t *, size_t);

struct VSC_main *VSC_C_main;

volatile struct params *cache_param;

int

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

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

{

  (void)vsb;

  (void)block;

  (void)track;

  (void)ptr;

  (void)smagic;

  (void)magic;

  (void)fmt;

  return (0);

}

void

VSL(enum VSL_tag_e tag, vxid_t vxid, const char *fmt, ...)

{

  (void)tag;

  (void)vxid;

  (void)fmt;

}

void

VSLb(struct vsl_log *vsl, enum VSL_tag_e tag, const char *fmt, ...)

{

  (void)vsl;

  (void)tag;

  (void)fmt;

}

void

VSLb_ts(struct vsl_log *l, const char *event, vtim_real first, vtim_real *pprev,

    vtim_real now)

{

  (void)l;

  (void)event;

  (void)first;

  (void)pprev;

  (void)now;

}

int

ObjVAIlease(struct worker *wrk, vai_hdl vhdl, struct vscarab *scarab)

{

  (void)wrk;

  (void)vhdl;

  (void)scarab;

  return (0);

}

void

ObjVAIreturn(struct worker *wrk, vai_hdl vhdl, struct vscaret *scaret)

{

  (void)wrk;

  (void)vhdl;

  (void)scaret;

}

void

WRK_Log(enum VSL_tag_e tag, const char *fmt, ...)

{

  (void)tag;

  (void)fmt;

}

int

LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)

{

  struct VSC_main __VSC_C_main;

  struct params __cache_param;

  struct http req[1];

  struct http resp[1];

  struct vfp_ctx vc[1];

  struct worker wrk[1];

  struct ws ws[1];

  struct vep_state *vep;

  struct vsb *vsb;

  txt hd[HTTP_HDR_URL + 1];

  char ws_buf[1024];

  if (size < 1)

    return (0);

  AN(data);

  VSC_C_main = &__VSC_C_main;

  cache_param = &__cache_param;

  memset(&__cache_param, 0, sizeof(__cache_param));

#define BSET(b, no) (b)[(no) >> 3] |= (0x80 >> ((no) & 7))

  if (data[0] & 0x8f)

    BSET(__cache_param.feature_bits, FEATURE_ESI_IGNORE_HTTPS);

  if (size > 1 && data[1] & 0x8f)

    BSET(__cache_param.feature_bits, FEATURE_ESI_DISABLE_XML_CHECK);

  if (size > 2 && data[2] & 0x8f)

    BSET(__cache_param.feature_bits, FEATURE_ESI_IGNORE_OTHER_ELEMENTS);

  if (size > 3 && data[3] & 0x8f)

    BSET(__cache_param.feature_bits, FEATURE_ESI_REMOVE_BOM);

#undef BSET

  /* Setup ws */

  WS_Init(ws, "req", ws_buf, sizeof ws_buf);

  /* Setup req */

  INIT_OBJ(req, HTTP_MAGIC);

  req->hd = hd;

  req->hd[HTTP_HDR_URL].b = "/";

  req->ws = ws;

  /* Setup resp */

  INIT_OBJ(resp, HTTP_MAGIC);

  resp->ws = ws;

  /* Setup wrk */

  INIT_OBJ(wrk, WORKER_MAGIC);

  /* Setup vc */

  INIT_OBJ(vc, VFP_CTX_MAGIC);

  vc->wrk = wrk;

  vc->resp = resp;

  vep = VEP_Init(vc, req, NULL, NULL);

  AN(vep);

  VEP_Parse(vep, (const char *)data, size);

  vsb = VEP_Finish(vep);

  if (vsb != NULL)

    VSB_destroy(&vsb);

  WS_Rollback(ws, 0);

  return (0);

}

#if defined(TEST_DRIVER)

int

main(int argc, char **argv)

{

  ssize_t len;

  char *buf;

  int i;

  for (i = 1; i < argc; i++) {

    len = 0;

    buf = VFIL_readfile(NULL, argv[i], &len);

    AN(buf);

    LLVMFuzzerTestOneInput((uint8_t *)buf, len);

    free(buf);

  }

}

#endif