/*-

 * Copyright (c) 2009-2012,2014 Michihiro NAKAJIMA

 * Copyright (c) 2003-2007 Tim Kientzle

 * All rights reserved.

 *

 * 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(S) ``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 THE AUTHOR(S) 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.

 */

#include "archive_platform.h"

#ifdef HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif

#ifdef HAVE_ERRNO_H

#include <errno.h>

#endif

#ifdef HAVE_FCNTL_H

#include <fcntl.h>

#endif

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

#ifdef HAVE_STRING_H

#include <string.h>

#endif

#if defined(_WIN32) && !defined(__CYGWIN__)

#if defined(HAVE_BCRYPT_H) && _WIN32_WINNT >= _WIN32_WINNT_VISTA

/* don't use bcrypt when XP needs to be supported */

#include <bcrypt.h>

/* Common in other bcrypt implementations, but missing from VS2008. */

#ifndef BCRYPT_SUCCESS

#define BCRYPT_SUCCESS(r) ((NTSTATUS)(r) == STATUS_SUCCESS)

#endif

#elif defined(HAVE_WINCRYPT_H)

#include <wincrypt.h>

#endif

#endif

#ifdef HAVE_ZLIB_H

#include <cm3p/zlib.h>

#endif

#ifdef HAVE_LZMA_H

#include <cm3p/lzma.h>

#endif

#ifdef HAVE_BZLIB_H

#include <cm3p/bzlib.h>

#endif

#ifdef HAVE_LZ4_H

#include <lz4.h>

#endif

#include "archive.h"

#include "archive_private.h"

#include "archive_random_private.h"

#include "archive_string.h"

#ifndef O_CLOEXEC

#define O_CLOEXEC 0

#endif

#if ARCHIVE_VERSION_NUMBER < 4000000

static int __LA_LIBC_CC archive_utility_string_sort_helper(const void *, const void *);

#endif

/* Generic initialization of 'struct archive' objects. */

int

__archive_clean(struct archive *a)

{

  archive_string_conversion_free(a);

  return (ARCHIVE_OK);

}

int

archive_version_number(void)

{

  return (ARCHIVE_VERSION_NUMBER);

}

const char *

archive_version_string(void)

{

  return (ARCHIVE_VERSION_STRING);

}

int

archive_errno(struct archive *a)

{

  return (a->archive_error_number);

}

const char *

archive_error_string(struct archive *a)

{

  if (a->error != NULL  &&  *a->error != '\0')

    return (a->error);

  else

    return (NULL);

}

int

archive_file_count(struct archive *a)

{

  return (a->file_count);

}

int

archive_format(struct archive *a)

{

  return (a->archive_format);

}

const char *

archive_format_name(struct archive *a)

{

  return (a->archive_format_name);

}

int

archive_compression(struct archive *a)

{

  return archive_filter_code(a, 0);

}

const char *

archive_compression_name(struct archive *a)

{

  return archive_filter_name(a, 0);

}

/*

 * Return a count of the number of compressed bytes processed.

 */

la_int64_t

archive_position_compressed(struct archive *a)

{

  return archive_filter_bytes(a, -1);

}

/*

 * Return a count of the number of uncompressed bytes processed.

 */

la_int64_t

archive_position_uncompressed(struct archive *a)

{

  return archive_filter_bytes(a, 0);

}

void

archive_clear_error(struct archive *a)

{

  archive_string_empty(&a->error_string);

  a->error = NULL;

  a->archive_error_number = 0;

}

void

archive_set_error(struct archive *a, int error_number, const char *fmt, ...)

{

  va_list ap;

  a->archive_error_number = error_number;

  if (fmt == NULL) {

    a->error = NULL;

    return;

  }

  archive_string_empty(&(a->error_string));

  va_start(ap, fmt);

  archive_string_vsprintf(&(a->error_string), fmt, ap);

  va_end(ap);

  a->error = a->error_string.s;

}

void

archive_copy_error(struct archive *dest, struct archive *src)

{

  dest->archive_error_number = src->archive_error_number;

  archive_string_copy(&dest->error_string, &src->error_string);

  dest->error = dest->error_string.s;

}

void

__archive_errx(int retvalue, const char *msg)

{

  static const char msg1[] = "Fatal Internal Error in libarchive: ";

  size_t s;

  s = write(2, msg1, strlen(msg1));

  (void)s; /* UNUSED */

  s = write(2, msg, strlen(msg));

  (void)s; /* UNUSED */

  s = write(2, "\n", 1);

  (void)s; /* UNUSED */

  exit(retvalue);

}

/*

 * Create a temporary file

 */

#if defined(_WIN32) && !defined(__CYGWIN__)

/*

 * Do not use Windows tmpfile() function.

 * It will make a temporary file under the root directory

 * and it'll cause permission error if a user who is

 * non-Administrator creates temporary files.

 * Also Windows version of mktemp family including _mktemp_s

 * are not secure.

 */

static int

__archive_mktempx(const char *tmpdir, wchar_t *template)

{

  static const wchar_t prefix[] = L"libarchive_";

  static const wchar_t suffix[] = L"XXXXXXXXXX";

  static const wchar_t num[] = {

    L'0', L'1', L'2', L'3', L'4', L'5', L'6', L'7',

    L'8', L'9', L'A', L'B', L'C', L'D', L'E', L'F',

    L'G', L'H', L'I', L'J', L'K', L'L', L'M', L'N',

    L'O', L'P', L'Q', L'R', L'S', L'T', L'U', L'V',

    L'W', L'X', L'Y', L'Z', L'a', L'b', L'c', L'd',

    L'e', L'f', L'g', L'h', L'i', L'j', L'k', L'l',

    L'm', L'n', L'o', L'p', L'q', L'r', L's', L't',

    L'u', L'v', L'w', L'x', L'y', L'z'

  };

  struct archive_wstring temp_name;

  wchar_t *ws;

  DWORD attr;

  wchar_t *xp, *ep;

  int fd;

#if defined(HAVE_BCRYPT_H) && _WIN32_WINNT >= _WIN32_WINNT_VISTA

  BCRYPT_ALG_HANDLE hAlg = NULL;

#else

  HCRYPTPROV hProv = (HCRYPTPROV)NULL;

#endif

  fd = -1;

  ws = NULL;

  archive_string_init(&temp_name);

  if (template == NULL) {

    /* Get a temporary directory. */

    if (tmpdir == NULL) {

      size_t l;

      wchar_t *tmp;

      l = GetTempPathW(0, NULL);

      if (l == 0) {

        la_dosmaperr(GetLastError());

        goto exit_tmpfile;

      }

      tmp = malloc(l*sizeof(wchar_t));

      if (tmp == NULL) {

        errno = ENOMEM;

        goto exit_tmpfile;

      }

      GetTempPathW((DWORD)l, tmp);

      archive_wstrcpy(&temp_name, tmp);

      free(tmp);

    } else {

      if (archive_wstring_append_from_mbs(&temp_name, tmpdir,

          strlen(tmpdir)) < 0)

        goto exit_tmpfile;

      if (temp_name.length == 0 ||

          temp_name.s[temp_name.length-1] != L'/')

        archive_wstrappend_wchar(&temp_name, L'/');

    }

    /* Check if temp_name is a directory. */

    attr = GetFileAttributesW(temp_name.s);

    if (attr == (DWORD)-1) {

      if (GetLastError() != ERROR_FILE_NOT_FOUND) {

        la_dosmaperr(GetLastError());

        goto exit_tmpfile;

      }

      ws = __la_win_permissive_name_w(temp_name.s);

      if (ws == NULL) {

        errno = EINVAL;

        goto exit_tmpfile;

      }

      attr = GetFileAttributesW(ws);

      if (attr == (DWORD)-1) {

        la_dosmaperr(GetLastError());

        goto exit_tmpfile;

      }

    }

    if (!(attr & FILE_ATTRIBUTE_DIRECTORY)) {

      errno = ENOTDIR;

      goto exit_tmpfile;

    }

    /*

     * Create a temporary file.

     */

    archive_wstrcat(&temp_name, prefix);

    archive_wstrcat(&temp_name, suffix);

    ep = temp_name.s + archive_strlen(&temp_name);

    xp = ep - wcslen(suffix);

    template = temp_name.s;

  } else {

    xp = wcschr(template, L'X');

    if (xp == NULL) /* No X, programming error */

      abort();

    for (ep = xp; *ep == L'X'; ep++)

      continue;

    if (*ep)  /* X followed by non X, programming error */

      abort();

  }

#if defined(HAVE_BCRYPT_H) && _WIN32_WINNT >= _WIN32_WINNT_VISTA

  if (!BCRYPT_SUCCESS(BCryptOpenAlgorithmProvider(&hAlg, BCRYPT_RNG_ALGORITHM,

    NULL, 0))) {

    la_dosmaperr(GetLastError());

    goto exit_tmpfile;

  }

#else

  if (!CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL,

    CRYPT_VERIFYCONTEXT)) {

    la_dosmaperr(GetLastError());

    goto exit_tmpfile;

  }

#endif

  for (;;) {

    wchar_t *p;

    HANDLE h;

# if _WIN32_WINNT >= 0x0602 /* _WIN32_WINNT_WIN8 */

    CREATEFILE2_EXTENDED_PARAMETERS createExParams;

#endif

    /* Generate a random file name through CryptGenRandom(). */

    p = xp;

#if defined(HAVE_BCRYPT_H) && _WIN32_WINNT >= _WIN32_WINNT_VISTA

    if (!BCRYPT_SUCCESS(BCryptGenRandom(hAlg, (PUCHAR)p,

        (DWORD)(ep - p)*sizeof(wchar_t), 0))) {

      la_dosmaperr(GetLastError());

      goto exit_tmpfile;

    }

#else

    if (!CryptGenRandom(hProv, (DWORD)(ep - p)*sizeof(wchar_t),

        (BYTE*)p)) {

      la_dosmaperr(GetLastError());

      goto exit_tmpfile;

    }

#endif

    for (; p < ep; p++)

      *p = num[((DWORD)*p) % (sizeof(num)/sizeof(num[0]))];

    free(ws);

    ws = __la_win_permissive_name_w(template);

    if (ws == NULL) {

      errno = EINVAL;

      goto exit_tmpfile;

    }

    if (template == temp_name.s) {

      attr = FILE_ATTRIBUTE_TEMPORARY |

             FILE_FLAG_DELETE_ON_CLOSE;

    } else {

      /* mkstemp */

      attr = FILE_ATTRIBUTE_NORMAL;

    }

# if _WIN32_WINNT >= 0x0602 /* _WIN32_WINNT_WIN8 */

    ZeroMemory(&createExParams, sizeof(createExParams));

    createExParams.dwSize = sizeof(createExParams);

    createExParams.dwFileAttributes = attr & 0xFFFF;

    createExParams.dwFileFlags = attr & 0xFFF00000;

    h = CreateFile2(ws,

        GENERIC_READ | GENERIC_WRITE | DELETE,

        0,/* Not share */

      CREATE_NEW,

      &createExParams);

#else

    h = CreateFileW(ws,

        GENERIC_READ | GENERIC_WRITE | DELETE,

        0,/* Not share */

        NULL,

        CREATE_NEW,/* Create a new file only */

        attr,

        NULL);

#endif

    if (h == INVALID_HANDLE_VALUE) {

      /* The same file already exists. retry with

       * a new filename. */

      if (GetLastError() == ERROR_FILE_EXISTS)

        continue;

      /* Otherwise, fail creation temporary file. */

      la_dosmaperr(GetLastError());

      goto exit_tmpfile;

    }

    fd = _open_osfhandle((intptr_t)h, _O_BINARY | _O_RDWR);

    if (fd == -1) {

      la_dosmaperr(GetLastError());

      CloseHandle(h);

      goto exit_tmpfile;

    } else

      break;/* success! */

  }

exit_tmpfile:

#if defined(HAVE_BCRYPT_H) && _WIN32_WINNT >= _WIN32_WINNT_VISTA

  if (hAlg != NULL)

    BCryptCloseAlgorithmProvider(hAlg, 0);

#else

  if (hProv != (HCRYPTPROV)NULL)

    CryptReleaseContext(hProv, 0);

#endif

  free(ws);

  if (template == temp_name.s)

    archive_wstring_free(&temp_name);

  return (fd);

}

int

__archive_mktemp(const char *tmpdir)

{

  return __archive_mktempx(tmpdir, NULL);

}

int

__archive_mkstemp(wchar_t *template)

{

  return __archive_mktempx(NULL, template);

}

#else

static int

__archive_issetugid(void)

{

#ifdef HAVE_ISSETUGID

  return (issetugid());

#elif HAVE_GETRESUID

  uid_t ruid, euid, suid;

  gid_t rgid, egid, sgid;

  if (getresuid(&ruid, &euid, &suid) != 0)

    return (-1);

  if (ruid != euid || ruid != suid)

    return (1);

  if (getresgid(&rgid, &egid, &sgid) != 0)

    return (-1);

  if (rgid != egid || rgid != sgid)

    return (1);

#elif HAVE_GETEUID

  if (geteuid() != getuid())

    return (1);

#if HAVE_GETEGID

  if (getegid() != getgid())

    return (1);

#endif

#endif

  return (0);

}

int

__archive_get_tempdir(struct archive_string *temppath)

{

  const char *tmp = NULL;

  if (__archive_issetugid() == 0)

    tmp = getenv("TMPDIR");

  if (tmp == NULL)

#ifdef _PATH_TMP

    tmp = _PATH_TMP;

#else

                tmp = "/tmp";

#endif

  archive_strcpy(temppath, tmp);

  if (temppath->length == 0 || temppath->s[temppath->length-1] != '/')

    archive_strappend_char(temppath, '/');

  return (ARCHIVE_OK);

}

#if defined(HAVE_MKSTEMP)

/*

 * We can use mkstemp().

 */

int

__archive_mktemp(const char *tmpdir)

{

  struct archive_string temp_name;

  int fd = -1;

  archive_string_init(&temp_name);

  if (tmpdir == NULL) {

    if (__archive_get_tempdir(&temp_name) != ARCHIVE_OK)

      goto exit_tmpfile;

  } else {

    archive_strcpy(&temp_name, tmpdir);

    if (temp_name.length == 0 ||

        temp_name.s[temp_name.length-1] != '/')

      archive_strappend_char(&temp_name, '/');

  }

#ifdef O_TMPFILE

  fd = open(temp_name.s, O_RDWR|O_CLOEXEC|O_TMPFILE|O_EXCL, 0600); 

  if(fd >= 0)

    goto exit_tmpfile;

#endif

  archive_strcat(&temp_name, "libarchive_XXXXXX");

  fd = mkstemp(temp_name.s);

  if (fd < 0)

    goto exit_tmpfile;

  __archive_ensure_cloexec_flag(fd);

  unlink(temp_name.s);

exit_tmpfile:

  archive_string_free(&temp_name);

  return (fd);

}

int

__archive_mkstemp(char *template)

{

  int fd = -1;

  fd = mkstemp(template);

  if (fd >= 0)

    __archive_ensure_cloexec_flag(fd);

  return (fd);

}

#else /* !HAVE_MKSTEMP */

/*

 * We use a private routine.

 */

static int

__archive_mktempx(const char *tmpdir, char *template)

{

        static const char num[] = {

    '0', '1', '2', '3', '4', '5', '6', '7',

    '8', '9', 'A', 'B', 'C', 'D', 'E', 'F',

    'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',

    'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',

    'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',

    'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',

    'm', 'n', 'o', 'p', 'q', 'r', 's', 't',

    'u', 'v', 'w', 'x', 'y', 'z'

        };

  struct archive_string temp_name;

  struct stat st;

  int fd;

  char *tp, *ep;

  fd = -1;

  if (template == NULL) {

    archive_string_init(&temp_name);

    if (tmpdir == NULL) {

      if (__archive_get_tempdir(&temp_name) != ARCHIVE_OK)

        goto exit_tmpfile;

    } else

      archive_strcpy(&temp_name, tmpdir);

    if (temp_name.length > 0 && temp_name.s[temp_name.length-1] == '/') {

      temp_name.s[temp_name.length-1] = '\0';

      temp_name.length --;

    }

    if (la_stat(temp_name.s, &st) < 0)

      goto exit_tmpfile;

    if (!S_ISDIR(st.st_mode)) {

      errno = ENOTDIR;

      goto exit_tmpfile;

    }

    archive_strcat(&temp_name, "/libarchive_");

    tp = temp_name.s + archive_strlen(&temp_name);

    archive_strcat(&temp_name, "XXXXXXXXXX");

    ep = temp_name.s + archive_strlen(&temp_name);

    template = temp_name.s;

  } else {

    tp = strchr(template, 'X');

    if (tp == NULL) /* No X, programming error */

      abort();

    for (ep = tp; *ep == 'X'; ep++)

      continue;

    if (*ep)  /* X followed by non X, programming error */

      abort();

  }

  do {

    char *p;

    p = tp;

    archive_random(p, ep - p);

    while (p < ep) {

      int d = *((unsigned char *)p) % sizeof(num);

      *p++ = num[d];

    }

    fd = open(template, O_CREAT | O_EXCL | O_RDWR | O_CLOEXEC,

        0600);

  } while (fd < 0 && errno == EEXIST);

  if (fd < 0)

    goto exit_tmpfile;

  __archive_ensure_cloexec_flag(fd);

  if (template == temp_name.s)

    unlink(temp_name.s);

exit_tmpfile:

  if (template == temp_name.s)

    archive_string_free(&temp_name);

  return (fd);

}

int

__archive_mktemp(const char *tmpdir)

{

  return __archive_mktempx(tmpdir, NULL);

}

int

__archive_mkstemp(char *template)

{

  return __archive_mktempx(NULL, template);

}

#endif /* !HAVE_MKSTEMP */

#endif /* !_WIN32 || __CYGWIN__ */

/*

 * Set FD_CLOEXEC flag to a file descriptor if it is not set.

 * We have to set the flag if the platform does not provide O_CLOEXEC

 * or F_DUPFD_CLOEXEC flags.

 *

 * Note: This function is absolutely called after creating a new file

 * descriptor even if the platform seemingly provides O_CLOEXEC or

 * F_DUPFD_CLOEXEC macros because it is possible that the platform

 * merely declares those macros, especially Linux 2.6.18 - 2.6.24 do it.

 */

void

__archive_ensure_cloexec_flag(int fd)

{

#if defined(_WIN32) && !defined(__CYGWIN__)

  (void)fd; /* UNUSED */

#else

  int flags;

  if (fd >= 0) {

    flags = fcntl(fd, F_GETFD);

    if (flags != -1 && (flags & FD_CLOEXEC) == 0)

      fcntl(fd, F_SETFD, flags | FD_CLOEXEC);

  }

#endif

}

#if ARCHIVE_VERSION_NUMBER < 4000000

/*

 * Utility functions to sort a group of strings using quicksort.

 */

static int

__LA_LIBC_CC

archive_utility_string_sort_helper(const void *p1, const void *p2)

{

  const char * const * const s1 = p1;

  const char * const * const s2 = p2;

  return strcmp(*s1, *s2);

}

int

archive_utility_string_sort(char **strings)

{

  size_t size = 0;

  while (strings[size] != NULL)

    size++;

  qsort(strings, size, sizeof(char *),

        archive_utility_string_sort_helper);

  return (ARCHIVE_OK);

}

#endif