static void writeLongname(int fd, int type, const char *name, int dir)
{
static const struct {
char mode[8]; /* 100-107 */
char uid[8]; /* 108-115 */
char gid[8]; /* 116-123 */
char size[12]; /* 124-135 */
char mtime[12]; /* 136-147 */
} prefilled = {
"0000000",
"0000000",
"0000000",
"00000000000",
"00000000000",
};
struct tar_header_t header;
int size;
dir = !!dir; /* normalize: 0/1 */
size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
/* + dir: account for possible '/' */
memset(&header, 0, sizeof(header));
strcpy(header.name, "././@LongLink");
memcpy(header.mode, prefilled.mode, sizeof(prefilled));
PUT_OCTAL(header.size, size);
header.typeflag = type;
chksum_and_xwrite(fd, &header);
/* Write filename[/] and pad the block. */
/* dir=0: writes 'name<NUL>', pads */
/* dir=1: writes 'name', writes '/<NUL>', pads */
dir *= 2;
xwrite(fd, name, size - dir);
xwrite(fd, "/", dir);
size = (-size) & (TAR_BLOCK_SIZE-1);
memset(&header, 0, size);
xwrite(fd, &header, size);
}
/* Write 2 blocks : extended file header + selinux context */
static int writeSeHeader(int fd, const char *con, struct tar_header_t *header)
{
char block[TAR_BLOCK_SIZE];
struct tar_header_t hd;
int sz = sizeof(SELINUX_CONTEXT_KEYWORD) + 4 + strlen(con);
if (sz >= 100) sz++; /* another ascii digit for size */
if (sz > TAR_BLOCK_SIZE)
return FALSE;
memset(&block, 0, TAR_BLOCK_SIZE);
sprintf(block, "%d %s=%s\n", sz, SELINUX_CONTEXT_KEYWORD, con);
/* write duplicated file entry */
memcpy(&hd, header, sizeof(hd));
hd.typeflag = EXTTYPE;
PUT_OCTAL(hd.size, sz);
chksum_and_xwrite(fd, &hd);
/* write selinux context */
xwrite(fd, &block, TAR_BLOCK_SIZE);
return TRUE;
}
/* Write out a tar header for the specified file/directory/whatever */
static int writeTarHeader(struct TarBallInfo *tbInfo,
const char *header_name, const char *fileName, struct stat *statbuf)
{
struct tar_header_t header;
memset(&header, 0, sizeof(header));
strncpy(header.name, header_name, sizeof(header.name));
/* POSIX says to mask mode with 07777. */
PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
PUT_OCTAL(header.uid, statbuf->st_uid);
PUT_OCTAL(header.gid, statbuf->st_gid);
memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
/* users report that files with negative st_mtime cause trouble, so: */
PUT_OCTAL(header.mtime, statbuf->st_mtime >= 0 ? statbuf->st_mtime : 0);
/* Enter the user and group names */
safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
if (tbInfo->hlInfo) {
/* This is a hard link */
header.typeflag = LNKTYPE;
strncpy(header.linkname, tbInfo->hlInfo->name,
sizeof(header.linkname));
#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
/* Write out long linkname if needed */
if (header.linkname[sizeof(header.linkname)-1])
writeLongname(tbInfo->tarFd, GNULONGLINK,
tbInfo->hlInfo->name, 0);
#endif
} else if (S_ISLNK(statbuf->st_mode)) {
char *lpath = xmalloc_readlink_or_warn(fileName);
if (!lpath)
return FALSE;
header.typeflag = SYMTYPE;
strncpy(header.linkname, lpath, sizeof(header.linkname));
#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
/* Write out long linkname if needed */
if (header.linkname[sizeof(header.linkname)-1])
writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
#else
/* If it is larger than 100 bytes, bail out */
if (header.linkname[sizeof(header.linkname)-1]) {
free(lpath);
bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
return FALSE;
}
#endif
free(lpath);
} else if (S_ISDIR(statbuf->st_mode)) {
header.typeflag = DIRTYPE;
/* Append '/' only if there is a space for it */
if (!header.name[sizeof(header.name)-1])
header.name[strlen(header.name)] = '/';
} else if (S_ISCHR(statbuf->st_mode)) {
header.typeflag = CHRTYPE;
PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
} else if (S_ISBLK(statbuf->st_mode)) {
header.typeflag = BLKTYPE;
PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
} else if (S_ISFIFO(statbuf->st_mode)) {
header.typeflag = FIFOTYPE;
} else if (S_ISREG(statbuf->st_mode)) {
/* header.size field is 12 bytes long */
/* Does octal-encoded size fit? */
uoff_t filesize = statbuf->st_size;
if (sizeof(filesize) <= 4
|| filesize <= (uoff_t)0777777777777LL
) {
PUT_OCTAL(header.size, filesize);
}
/* Does base256-encoded size fit?
* It always does unless off_t is wider than 64 bits.
*/
else if (ENABLE_FEATURE_TAR_GNU_EXTENSIONS
#if ULLONG_MAX > 0xffffffffffffffffLL /* 2^64-1 */
&& (filesize <= 0x3fffffffffffffffffffffffLL)
#endif
) {
/* GNU tar uses "base-256 encoding" for very large numbers.
* Encoding is binary, with highest bit always set as a marker
* and sign in next-highest bit:
* 80 00 .. 00 - zero
* bf ff .. ff - largest positive number
* ff ff .. ff - minus 1
* c0 00 .. 00 - smallest negative number
*/
char *p8 = header.size + sizeof(header.size);
do {
*--p8 = (uint8_t)filesize;
filesize >>= 8;
} while (p8 != header.size);
*p8 |= 0x80;
} else {
static int writeTarHeader(struct TarBallInfo *tbInfo,
const char *header_name, const char *fileName, struct stat *statbuf)
{
struct TarHeader header;
if (sizeof(header) != 512)
BUG_tar_header_size();
memset(&header, 0, sizeof(struct TarHeader));
strncpy(header.name, header_name, sizeof(header.name));
/* POSIX says to mask mode with 07777. */
PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
PUT_OCTAL(header.uid, statbuf->st_uid);
PUT_OCTAL(header.gid, statbuf->st_gid);
memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
PUT_OCTAL(header.mtime, statbuf->st_mtime);
/* Enter the user and group names */
safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
if (tbInfo->hlInfo) {
/* This is a hard link */
header.typeflag = LNKTYPE;
strncpy(header.linkname, tbInfo->hlInfo->name,
sizeof(header.linkname));
#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
/* Write out long linkname if needed */
if (header.linkname[sizeof(header.linkname)-1])
writeLongname(tbInfo->tarFd, GNULONGLINK,
tbInfo->hlInfo->name, 0);
#endif
} else if (S_ISLNK(statbuf->st_mode)) {
char *lpath = xmalloc_readlink_or_warn(fileName);
if (!lpath)
return FALSE;
header.typeflag = SYMTYPE;
strncpy(header.linkname, lpath, sizeof(header.linkname));
#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
/* Write out long linkname if needed */
if (header.linkname[sizeof(header.linkname)-1])
writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
#else
/* If it is larger than 100 bytes, bail out */
if (header.linkname[sizeof(header.linkname)-1]) {
free(lpath);
bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
return FALSE;
}
#endif
free(lpath);
} else if (S_ISDIR(statbuf->st_mode)) {
header.typeflag = DIRTYPE;
/* Append '/' only if there is a space for it */
if (!header.name[sizeof(header.name)-1])
header.name[strlen(header.name)] = '/';
} else if (S_ISCHR(statbuf->st_mode)) {
header.typeflag = CHRTYPE;
PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
} else if (S_ISBLK(statbuf->st_mode)) {
header.typeflag = BLKTYPE;
PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
} else if (S_ISFIFO(statbuf->st_mode)) {
header.typeflag = FIFOTYPE;
} else if (S_ISREG(statbuf->st_mode)) {
if (sizeof(statbuf->st_size) > 4
&& statbuf->st_size > (off_t)0777777777777LL
) {
bb_error_msg_and_die("cannot store file '%s' "
"of size %"OFF_FMT"d, aborting",
fileName, statbuf->st_size);
}
header.typeflag = REGTYPE;
PUT_OCTAL(header.size, statbuf->st_size);
} else {
bb_error_msg("%s: unknown file type", fileName);
return FALSE;
}
#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
/* Write out long name if needed */
/* (we, like GNU tar, output long linkname *before* long name) */
if (header.name[sizeof(header.name)-1])
writeLongname(tbInfo->tarFd, GNULONGNAME,
header_name, S_ISDIR(statbuf->st_mode));
#endif
/* Now write the header out to disk */
chksum_and_xwrite(tbInfo->tarFd, &header);
/* Now do the verbose thing (or not) */
if (tbInfo->verboseFlag) {
FILE *vbFd = stdout;
/* If archive goes to stdout, verbose goes to stderr */
if (tbInfo->tarFd == STDOUT_FILENO)
vbFd = stderr;
/* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
/* We don't have such excesses here: for us "v" == "vv" */
/* '/' is probably a GNUism */
fprintf(vbFd, "%s%s\n", header_name,
S_ISDIR(statbuf->st_mode) ? "/" : "");
}
return TRUE;
}
