// This file is under GNU General Public License 3.0

// see LICENSE.txt

#define PEP_ENGINE_VERSION "0.8.0"

// maximum attachment size to import as key 1MB, maximum of 20 attachments

#define MAX_KEY_SIZE (1024 * 1024)

#define MAX_KEYS_TO_IMPORT  20

// this is 20 trustwords with 79 chars max

#define MAX_TRUSTWORDS_SPACE (20 * 80)

// XML parameters string

#define PARMS_MAX 32768

// maximum busy wait time in ms

#define BUSY_WAIT_TIME 5000

// maximum line length for reading gpg.conf

#define MAX_LINELENGTH 1024

// default keyserver

#ifndef DEFAULT_KEYSERVER

#define DEFAULT_KEYSERVER "hkp://keys.gnupg.net"

#endif

// crashdump constants

#ifndef CRASHDUMP_DEFAULT_LINES

#define CRASHDUMP_DEFAULT_LINES 100

#endif

#define CRASHDUMP_MAX_LINES 32767

#include "platform.h"

#ifdef WIN32

#define LOCAL_DB windoze_local_db()

#define SYSTEM_DB windoze_system_db()

#define LIBGPGME "libgpgme-11.dll"

#else // UNIX

#define _POSIX_C_SOURCE 200809L

#include <dlfcn.h>

#define LOCAL_DB unix_local_db()

#ifndef SYSTEM_DB

#define SYSTEM_DB "/usr/share/pEp/system.db"

#endif

#ifndef LIBGPGME

#define LIBGPGME "libgpgme-pthread.so"

#endif

#endif

#include <locale.h>

#include <stdlib.h>

#include <string.h>

#include <assert.h>

#include <stdio.h>

#include <ctype.h>

#include "sqlite3.h"

#define _EXPORT_PEP_ENGINE_DLL

#include "pEpEngine.h"

// If not specified, build for GPG

#ifndef USE_NETPGP

#ifndef USE_GPG

#define USE_GPG

#endif

#endif

#ifdef USE_GPG

#include "pgp_gpg_internal.h"

#elif defined(USE_NETPGP)

#include "pgp_netpgp_internal.h"

#endif

#include "keymanagement.h"

#include "cryptotech.h"

#include "transport.h"

#include "sync.h"

#define NOT_IMPLEMENTED assert(0); return PEP_UNKNOWN_ERROR;

struct _pEpSession;

typedef struct _pEpSession pEpSession;

struct _pEpSession {

    const char *version;

#ifdef USE_GPG

    gpgme_ctx_t ctx;

#elif defined(USE_NETPGP)

    pEpNetPGPSession ctx;

#endif

    PEP_cryptotech_t *cryptotech;

    PEP_transport_t *transports;

    sqlite3 *db;

    sqlite3 *system_db;

    sqlite3_stmt *log;

    sqlite3_stmt *trustword;

    sqlite3_stmt *get_identity;

    sqlite3_stmt *set_person;

    sqlite3_stmt *set_device_group;

    sqlite3_stmt *get_device_group;

    sqlite3_stmt *set_pgp_keypair;

    sqlite3_stmt *set_identity;

    sqlite3_stmt *set_identity_flags;

    sqlite3_stmt *unset_identity_flags;

    sqlite3_stmt *set_trust;

    sqlite3_stmt *get_trust;

    sqlite3_stmt *least_trust;

    sqlite3_stmt *mark_compromized;

    sqlite3_stmt *reset_trust;

    sqlite3_stmt *crashdump;

    sqlite3_stmt *languagelist;

    sqlite3_stmt *i18n_token;

    // blacklist

    sqlite3_stmt *blacklist_add;

    sqlite3_stmt *blacklist_delete;

    sqlite3_stmt *blacklist_is_listed;

    sqlite3_stmt *blacklist_retrieve;

    // Own keys

    sqlite3_stmt *own_key_is_listed;

    sqlite3_stmt *own_identities_retrieve;

    sqlite3_stmt *own_keys_retrieve;

    sqlite3_stmt *set_own_key;

    // sequence value

    sqlite3_stmt *sequence_value1;

    sqlite3_stmt *sequence_value2;

    sqlite3_stmt *sequence_value3;

    // revoked keys

    sqlite3_stmt *set_revoked;

    sqlite3_stmt *get_revoked;

    // callbacks

    examine_identity_t examine_identity;

    void *examine_management;

    void *sync_management;

    void *sync_obj;

    messageToSend_t messageToSend;

    notifyHandshake_t notifyHandshake;

    inject_sync_msg_t inject_sync_msg;

    retrieve_next_sync_msg_t retrieve_next_sync_msg;

    // key sync

    pEpSession* sync_session;

    DeviceState_state sync_state;

    void* sync_state_payload;

    char sync_uuid[37];

    time_t LastCannotDecrypt;

    time_t LastUpdateRequest;

    // runtime config

    bool passive_mode;

    bool unencrypted_subject;

    bool use_only_own_private_keys;

    bool keep_sync_msg;

};

PEP_STATUS init_transport_system(PEP_SESSION session, bool in_first);

void release_transport_system(PEP_SESSION session, bool out_last);

#ifdef NDEBUG

#define DEBUG_LOG(TITLE, ENTITY, DESC)

#define  LOGD(...)

#else

#define DEBUG_LOG(TITLE, ENTITY, DESC) \

    log_event(session, (TITLE), (ENTITY), (DESC), "debug");

#ifdef ANDROID

#include <android/log.h>

#define  LOG_TAG    "pEpEngine"

#define  LOGD(...)  __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)

#endif

#endif

// Space tolerant and case insensitive fingerprint string compare

static inline int _same_fpr(

        const char* fpra,

        size_t fpras,

        const char* fprb,

        size_t fprbs

    )

{

    size_t ai = 0;

    size_t bi = 0;

    do

    {

        if(fpra[ai] == 0 || fprb[bi] == 0)

        {

            return 0;

        }

        else if(fpra[ai] == ' ')

        {

            ai++;

        }

        else if(fprb[bi] == ' ')

        {

            bi++;

        }

        else if(toupper(fpra[ai]) == toupper(fprb[bi]))

        {

            ai++;

            bi++;

        }

        else

        {

            return 0;

        }

    }

    while(ai < fpras && bi < fprbs);

    return ai == fpras && bi == fprbs;

}