/*
 *
 * honggfuzz - core structures and macros
 * -----------------------------------------
 *
 * Author: Robert Swiecki <swiecki@google.com>
 *
 * Copyright 2010-2017 by Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 *
 */

#ifndef _HF_HONGGFUZZ_H_
#define _HF_HONGGFUZZ_H_

#include <dirent.h>
#include <inttypes.h>
#include <limits.h>
#include <pthread.h>
#include <stdbool.h>
#include <stdint.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <time.h>

#include "libcommon/util.h"

#define PROG_NAME "honggfuzz"
#define PROG_VERSION "1.3"

/* Name of the template which will be replaced with the proper name of the file */
#define _HF_FILE_PLACEHOLDER "___FILE___"

/* Default name of the report created with some architectures */
#define _HF_REPORT_FILE "HONGGFUZZ.REPORT.TXT"

/* Default stack-size of created threads. */
#define _HF_PTHREAD_STACKSIZE (1024 * 1024 * 2) /* 2MB */

/* Name of envvar which indicates sequential number of fuzzer */
#define _HF_THREAD_NO_ENV "HFUZZ_THREAD_NO"

/* Number of crash verifier iterations before tag crash as stable */
#define _HF_VERIFIER_ITER 5

/* Size (in bytes) for report data to be stored in stack before written to file */
#define _HF_REPORT_SIZE 8192

/* Perf bitmap size */
#define _HF_PERF_BITMAP_SIZE_16M (1024U * 1024U * 16U)
#define _HF_PERF_BITMAP_BITSZ_MASK 0x7ffffff
/* Maximum number of PC guards (=trace-pc-guard) we support */
#define _HF_PC_GUARD_MAX (1024U * 1024U * 16U)

/* FD used to pass feedback bitmap a process */
#define _HF_BITMAP_FD 1022
/* FD used to pass data to a persistent process */
#define _HF_PERSISTENT_FD 1023
/* Maximum number of active fuzzing threads */
#define _HF_THREAD_MAX 1024U

typedef enum {
    _HF_DYNFILE_NONE = 0x0,
    _HF_DYNFILE_INSTR_COUNT = 0x1,
    _HF_DYNFILE_BRANCH_COUNT = 0x2,
    _HF_DYNFILE_BTS_EDGE = 0x10,
    _HF_DYNFILE_IPT_BLOCK = 0x20,
    _HF_DYNFILE_SOFT = 0x40,
} dynFileMethod_t;

typedef struct {
    uint64_t cpuInstrCnt;
    uint64_t cpuBranchCnt;
    uint64_t bbCnt;
    uint64_t newBBCnt;
    uint64_t softCntPc;
    uint64_t softCntEdge;
    uint64_t softCntCmp;
} hwcnt_t;

/* Sanitizer coverage specific data structures */
typedef struct {
    uint64_t hitBBCnt;
    uint64_t totalBBCnt;
    uint64_t dsoCnt;
    uint64_t iDsoCnt;
    uint64_t newBBCnt;
    uint64_t crashesCnt;
} sancovcnt_t;

typedef struct {
    uint32_t capacity;
    uint32_t* pChunks;
    uint32_t nChunks;
} bitmap_t;

/* Memory map struct */
typedef struct __attribute__((packed)) {
    uint64_t start;          // region start addr
    uint64_t end;            // region end addr
    uint64_t base;           // region base addr
    char mapName[NAME_MAX];  // bin/DSO name
    uint64_t bbCnt;
    uint64_t newBBCnt;
} memMap_t;

/* Trie node data struct */
typedef struct __attribute__((packed)) {
    bitmap_t* pBM;
} trieData_t;

/* Trie node struct */
typedef struct node {
    char key;
    trieData_t data;
    struct node* next;
    struct node* prev;
    struct node* children;
    struct node* parent;
} node_t;

/* EOF Sanitizer coverage specific data structures */

typedef struct {
    char* asanOpts;
    char* msanOpts;
    char* ubsanOpts;
} sanOpts_t;

typedef enum {
    _HF_STATE_UNSET = 0,
    _HF_STATE_STATIC = 1,
    _HF_STATE_DYNAMIC_PRE = 2,
    _HF_STATE_DYNAMIC_MAIN = 3,
} fuzzState_t;

struct dynfile_t {
    uint8_t* data;
    size_t size;
    TAILQ_ENTRY(dynfile_t)
    pointers;
};

struct strings_t {
    char* s;
    size_t len;
    TAILQ_ENTRY(strings_t)
    pointers;
};

typedef struct {
    bool pcGuardMap[_HF_PC_GUARD_MAX];
    uint8_t bbMapPc[_HF_PERF_BITMAP_SIZE_16M];
    uint8_t bbMapCmp[_HF_PERF_BITMAP_SIZE_16M];
    uint64_t pidFeedbackPc[_HF_THREAD_MAX];
    uint64_t pidFeedbackEdge[_HF_THREAD_MAX];
    uint64_t pidFeedbackCmp[_HF_THREAD_MAX];
} feedback_t;

typedef struct {
    struct {
        const char* inputDir;
        DIR* inputDirPtr;
        size_t fileCnt;
        const char* fileExtn;
        bool fileCntDone;
        const char* workDir;
        const char* crashDir;
        const char* covDirAll;
        const char* covDirNew;
        bool saveUnique;
    } io;
    struct {
        const char* const* cmdline;
        bool nullifyStdio;
        bool fuzzStdin;
        char* externalCommand;
        char* postExternalCommand;
        uint64_t asLimit;
        uint64_t rssLimit;
        uint64_t dataLimit;
        bool clearEnv;
        char* envs[128];
    } exe;
    struct {
        size_t threadsMax;
        size_t threadsFinished;
        uint32_t threadsActiveCnt;
        pthread_t mainThread;
        pid_t mainPid;
    } threads;
    struct {
        time_t timeStart;
        time_t runEndTime;
        time_t tmOut;
        bool tmoutVTALRM;
    } timing;
    bool useScreen;
    bool useVerifier;
    char cmdline_txt[61];
    unsigned mutationsPerRun;
    const char* blacklistFile;
    uint64_t* blacklist;
    size_t blacklistCnt;
    size_t mutationsMax;
    size_t maxFileSz;
    char* reportFile;
    bool persistent;
    bool skipFeedbackOnTimeout;
    bool enableSanitizers;
    bool monitorSIGABRT;
    bool exitUponCrash;
    const char* dictionaryFile;
    TAILQ_HEAD(strq_t, strings_t) dictq;
    size_t dictionaryCnt;
    struct strings_t* dictqCurrent;

    fuzzState_t state;
    feedback_t* feedback;
    int bbFd;

    size_t dynfileqCnt;
    TAILQ_HEAD(dyns_t, dynfile_t) dynfileq;
    pthread_rwlock_t dynfileq_mutex;

    pthread_mutex_t feedback_mutex;

    struct {
        size_t mutationsCnt;
        size_t crashesCnt;
        size_t uniqueCrashesCnt;
        size_t verifiedCrashesCnt;
        size_t blCrashesCnt;
        size_t timeoutedCnt;
    } cnts;

    dynFileMethod_t dynFileMethod;
    sancovcnt_t sanCovCnts;
    pthread_mutex_t sanCov_mutex;
    sanOpts_t sanOpts;
    size_t dynFileIterExpire;
    bool useSanCov;
    node_t* covMetadata;

    pthread_mutex_t report_mutex;

    /* For the Linux code */
    struct {
        int exeFd;
        hwcnt_t hwCnts;
        uint64_t dynamicCutOffAddr;
        bool disableRandomization;
        void* ignoreAddr;
        size_t numMajorFrames;
        pid_t pid;
        const char* pidFile;
        char pidCmd[55];
        const char* symsBlFile;
        char** symsBl;
        size_t symsBlCnt;
        const char* symsWlFile;
        char** symsWl;
        size_t symsWlCnt;
        uintptr_t cloneFlags;
        bool kernelOnly;
        bool useClone;
    } linux;
} honggfuzz_t;

typedef struct {
    honggfuzz_t* global;
    pid_t pid;
    pid_t persistentPid;
    fuzzState_t state;
    int64_t timeStartedMillis;
    const char* origFileName;
    char fileName[PATH_MAX];
    char crashFileName[PATH_MAX];
    uint64_t pc;
    uint64_t backtrace;
    uint64_t access;
    int exception;
    char report[_HF_REPORT_SIZE];
    bool mainWorker;
    unsigned mutationsPerRun;
    struct dynfile_t* dynfileqCurrent;
    uint8_t* dynamicFile;
    size_t dynamicFileSz;
    uint32_t fuzzNo;
    int persistentSock;
    bool tmOutSignaled;
#if !defined(_HF_ARCH_DARWIN)
    timer_t timerId;
#endif  // !defined(_HF_ARCH_DARWIN)

    sancovcnt_t sanCovCnts;

    struct {
        /* For Linux code */
        uint8_t* perfMmapBuf;
        uint8_t* perfMmapAux;
        hwcnt_t hwCnts;
        pid_t attachedPid;
        int cpuInstrFd;
        int cpuBranchFd;
        int cpuIptBtsFd;
    } linux;
} run_t;

/* Go-style defer implementation */
#define __STRMERGE(a, b) a##b
#define _STRMERGE(a, b) __STRMERGE(a, b)
#ifdef __clang__
#if __has_extension(blocks)
static void __attribute__((unused)) __clang_cleanup_func(void (^*dfunc)(void)) { (*dfunc)(); }

#define defer                                        \
    void (^_STRMERGE(__defer_f_, __COUNTER__))(void) \
        __attribute__((cleanup(__clang_cleanup_func))) __attribute__((unused)) = ^
#else /* __has_extension(blocks) */
#define defer UNIMPLEMENTED - NO - SUPPORT - FOR - BLOCKS - IN - YOUR - CLANG - ENABLED
#endif /*  __has_extension(blocks) */
#else  /* __clang */
#define __block
#define _DEFER(a, count)                                                                      \
    auto void _STRMERGE(__defer_f_, count)(void* _defer_arg __attribute__((unused)));         \
    int _STRMERGE(__defer_var_, count) __attribute__((cleanup(_STRMERGE(__defer_f_, count)))) \
        __attribute__((unused));                                                              \
    void _STRMERGE(__defer_f_, count)(void* _defer_arg __attribute__((unused)))
#define defer _DEFER(a, __COUNTER__)
#endif /* __clang */

#define MX_SCOPED_LOCK(m) \
    MX_LOCK(m);           \
    defer { MX_UNLOCK(m); }

#define MX_SCOPED_RWLOCK_READ(m) \
    MX_RWLOCK_READ(m);           \
    defer { MX_RWLOCK_UNLOCK(m); }
#define MX_SCOPED_RWLOCK_WRITE(m) \
    MX_RWLOCK_WRITE(m);           \
    defer { MX_RWLOCK_UNLOCK(m); }

#endif