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alpine
abuild
Commits
248e9bb4
Commit
248e9bb4
authored
Nov 01, 2014
by
Timo Teräs
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abuild-tar: write checksum to extended header
parent
18594ff6
Changes
1
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1 changed file
with
156 additions
and
43 deletions
+156
-43
abuild-tar.c
abuild-tar.c
+156
-43
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abuild-tar.c
View file @
248e9bb4
/* abuild-tar.c - A TAR mangling utility for .APK packages
*
* Copyright (C) 2009 Timo Teräs <timo.teras@iki.fi>
* Copyright (C) 2009
-2014
Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
...
...
@@ -89,6 +89,19 @@ static void put_octal(char *s, size_t l, size_t value)
*
(
ptr
--
)
=
'0'
;
}
static
void
tarhdr_checksum
(
struct
tar_header
*
hdr
)
{
const
unsigned
char
*
src
;
size_t
chksum
,
i
;
/* Recalculate checksum */
memset
(
hdr
->
chksum
,
' '
,
sizeof
(
hdr
->
chksum
));
src
=
(
const
unsigned
char
*
)
hdr
;
for
(
i
=
chksum
=
0
;
i
<
sizeof
(
*
hdr
);
i
++
)
chksum
+=
src
[
i
];
put_octal
(
hdr
->
chksum
,
sizeof
(
hdr
->
chksum
)
-
1
,
chksum
);
}
static
int
usage
(
void
)
{
fprintf
(
stderr
,
...
...
@@ -120,7 +133,7 @@ static ssize_t full_read(int fd, void *buf, size_t count)
}
while
(
1
);
if
(
total
==
0
&&
n
<
0
)
return
-
1
;
return
-
errno
;
return
total
;
}
...
...
@@ -142,7 +155,7 @@ static ssize_t full_write(int fd, const void *buf, size_t count)
}
while
(
1
);
if
(
total
==
0
&&
n
<
0
)
return
-
1
;
return
-
errno
;
return
total
;
}
...
...
@@ -163,82 +176,182 @@ static ssize_t full_splice(int from_fd, int to_fd, size_t count)
}
while
(
1
);
if
(
total
==
0
&&
n
<
0
)
return
-
1
;
return
-
errno
;
return
total
;
}
static
int
do_it
(
const
EVP_MD
*
md
,
int
cut
)
#define BUF_INITIALIZER {0}
struct
buf
{
char
*
ptr
;
size_t
size
;
size_t
alloc
;
};
static
void
buf_free
(
struct
buf
*
b
)
{
free
(
b
->
ptr
);
}
static
int
buf_resize
(
struct
buf
*
b
,
size_t
newsize
)
{
struct
tar_header
hdr
;
size_t
size
,
aligned_size
;
void
*
ptr
;
int
dohash
=
0
,
r
;
if
(
b
->
alloc
>=
newsize
)
return
0
;
ptr
=
realloc
(
b
->
ptr
,
newsize
);
if
(
!
ptr
)
return
-
ENOMEM
;
b
->
ptr
=
ptr
;
b
->
alloc
=
newsize
;
return
0
;
}
static
int
buf_padto
(
struct
buf
*
b
,
size_t
alignment
)
{
size_t
oldsize
,
newsize
;
oldsize
=
b
->
size
;
newsize
=
(
oldsize
+
alignment
-
1
)
&
-
alignment
;
if
(
buf_resize
(
b
,
newsize
))
return
-
ENOMEM
;
b
->
size
=
newsize
;
memset
(
b
->
ptr
+
oldsize
,
0
,
newsize
-
oldsize
);
return
0
;
}
static
int
buf_read_fd
(
struct
buf
*
b
,
int
fd
,
size_t
size
)
{
ssize_t
r
;
r
=
buf_resize
(
b
,
size
);
if
(
r
)
return
r
;
r
=
full_read
(
fd
,
b
->
ptr
,
size
);
if
(
r
==
size
)
{
b
->
size
=
r
;
return
0
;
}
b
->
size
=
0
;
if
(
r
<
0
)
return
r
;
return
-
EIO
;
}
static
int
buf_write_fd
(
struct
buf
*
b
,
int
fd
)
{
ssize_t
r
;
r
=
full_write
(
fd
,
b
->
ptr
,
b
->
size
);
if
(
r
==
b
->
size
)
return
0
;
if
(
r
<
0
)
return
r
;
return
-
ENOSPC
;
}
static
int
buf_add_ext_header_hexdump
(
struct
buf
*
b
,
const
char
*
hdr
,
const
char
*
value
,
int
valuelen
)
{
size_t
oldsize
=
b
->
size
;
int
i
,
len
;
/* "%u %s=%s\n" */
len
=
1
+
1
+
strlen
(
hdr
)
+
1
+
valuelen
*
2
+
1
;
for
(
i
=
len
;
i
>
9
;
i
/=
10
)
len
++
;
if
(
buf_resize
(
b
,
b
->
size
+
len
))
return
-
ENOMEM
;
b
->
size
+=
snprintf
(
&
b
->
ptr
[
b
->
size
],
len
,
"%u %s="
,
len
,
hdr
);
for
(
i
=
0
;
i
<
valuelen
;
i
++
)
b
->
size
+=
snprintf
(
&
b
->
ptr
[
b
->
size
],
3
,
"%02x"
,
(
int
)(
unsigned
char
)
value
[
i
]);
b
->
ptr
[
b
->
size
++
]
=
'\n'
;
return
0
;
}
static
void
add_legacy_checksum
(
struct
tar_header
*
hdr
,
const
EVP_MD
*
md
,
const
char
*
digest
)
{
struct
{
char
id
[
4
];
uint16_t
nid
;
uint16_t
size
;
}
mdinfo
;
if
(
md
!=
NULL
)
{
memcpy
(
mdinfo
.
id
,
"APK2"
,
4
);
mdinfo
.
nid
=
EVP_MD_nid
(
md
);
mdinfo
.
size
=
EVP_MD_size
(
md
);
}
memcpy
(
mdinfo
.
id
,
"APK2"
,
4
);
mdinfo
.
nid
=
EVP_MD_nid
(
md
);
mdinfo
.
size
=
EVP_MD_size
(
md
);
memcpy
(
&
hdr
->
linkname
[
3
],
&
mdinfo
,
sizeof
(
mdinfo
));
memcpy
(
&
hdr
->
linkname
[
3
+
sizeof
(
mdinfo
)],
digest
,
mdinfo
.
size
);
tarhdr_checksum
(
hdr
);
}
static
int
do_it
(
const
EVP_MD
*
md
,
int
cut
)
{
char
checksumhdr
[
32
],
digest
[
EVP_MAX_MD_SIZE
];
struct
buf
data
=
BUF_INITIALIZER
,
pax
=
BUF_INITIALIZER
;
struct
tar_header
hdr
,
paxhdr
;
size_t
size
,
aligned_size
;
int
dohash
=
0
,
r
,
ret
=
1
;
if
(
md
)
snprintf
(
checksumhdr
,
sizeof
(
checksumhdr
),
"APK-TOOLS.checksum.%s"
,
EVP_MD_name
(
md
));
do
{
if
(
full_read
(
STDIN_FILENO
,
&
hdr
,
sizeof
(
hdr
))
!=
sizeof
(
hdr
))
return
0
;
goto
err
;
if
(
cut
&&
hdr
.
name
[
0
]
==
0
)
return
0
;
break
;
size
=
GET_OCTAL
(
hdr
.
size
);
aligned_size
=
(
size
+
511
)
&
~
511
;
if
(
md
!=
NULL
)
dohash
=
(
hdr
.
typeflag
==
'0'
||
hdr
.
typeflag
==
'7'
);
if
(
hdr
.
typeflag
==
'x'
)
{
memcpy
(
&
paxhdr
,
&
hdr
,
sizeof
(
hdr
));
if
(
buf_read_fd
(
&
pax
,
STDIN_FILENO
,
aligned_size
))
goto
err
;
pax
.
size
=
size
;
continue
;
}
dohash
=
md
&&
(
hdr
.
typeflag
==
'0'
||
hdr
.
typeflag
==
'7'
||
hdr
.
typeflag
==
'2'
);
if
(
dohash
)
{
const
unsigned
char
*
src
;
int
chksum
,
i
;
ptr
=
malloc
(
aligned_size
);
if
(
full_read
(
STDIN_FILENO
,
ptr
,
aligned_size
)
!=
aligned_size
)
return
1
;
memcpy
(
&
hdr
.
linkname
[
3
],
&
mdinfo
,
sizeof
(
mdinfo
));
EVP_Digest
(
ptr
,
size
,
&
hdr
.
linkname
[
3
+
sizeof
(
mdinfo
)],
NULL
,
md
,
NULL
);
/* Recalculate checksum */
memset
(
hdr
.
chksum
,
' '
,
sizeof
(
hdr
.
chksum
));
src
=
(
const
unsigned
char
*
)
&
hdr
;
for
(
i
=
chksum
=
0
;
i
<
sizeof
(
hdr
);
i
++
)
chksum
+=
src
[
i
];
put_octal
(
hdr
.
chksum
,
sizeof
(
hdr
.
chksum
)
-
1
,
chksum
);
if
(
buf_read_fd
(
&
data
,
STDIN_FILENO
,
aligned_size
))
goto
err
;
if
(
hdr
.
typeflag
!=
'2'
)
{
EVP_Digest
(
data
.
ptr
,
size
,
digest
,
NULL
,
md
,
NULL
);
add_legacy_checksum
(
&
hdr
,
md
,
digest
);
}
else
{
EVP_Digest
(
hdr
.
linkname
,
strlen
(
hdr
.
linkname
),
digest
,
NULL
,
md
,
NULL
);
}
buf_add_ext_header_hexdump
(
&
pax
,
checksumhdr
,
digest
,
EVP_MD_size
(
md
));
PUT_OCTAL
(
paxhdr
.
size
,
pax
.
size
);
tarhdr_checksum
(
&
paxhdr
);
}
if
(
pax
.
size
)
{
/* write pax header + content */
if
(
full_write
(
STDOUT_FILENO
,
&
paxhdr
,
sizeof
(
paxhdr
))
!=
sizeof
(
paxhdr
)
||
buf_padto
(
&
pax
,
512
)
||
buf_write_fd
(
&
pax
,
STDOUT_FILENO
))
goto
err
;
}
if
(
full_write
(
STDOUT_FILENO
,
&
hdr
,
sizeof
(
hdr
))
!=
sizeof
(
hdr
))
return
2
;
if
(
full_write
(
STDOUT_FILENO
,
&
hdr
,
sizeof
(
hdr
))
!=
sizeof
(
hdr
))
goto
err
;
if
(
dohash
)
{
if
(
full_write
(
STDOUT_FILENO
,
ptr
,
aligned_size
)
!=
aligned_size
)
return
2
;
free
(
ptr
);
if
(
buf_write_fd
(
&
data
,
STDOUT_FILENO
))
goto
err
;
}
else
if
(
aligned_size
!=
0
)
{
r
=
full_splice
(
STDIN_FILENO
,
STDOUT_FILENO
,
aligned_size
);
if
(
r
==
-
1
)
{
while
(
aligned_size
>
0
)
{
if
(
full_read
(
STDIN_FILENO
,
&
hdr
,
sizeof
(
hdr
))
!=
sizeof
(
hdr
))
return
1
;
goto
err
;
if
(
full_write
(
STDOUT_FILENO
,
&
hdr
,
sizeof
(
hdr
))
!=
sizeof
(
hdr
))
return
2
;
goto
err
;
aligned_size
-=
sizeof
(
hdr
);
}
}
else
if
(
r
!=
aligned_size
)
return
2
;
}
else
if
(
r
!=
aligned_size
)
goto
err
;
}
memset
(
&
paxhdr
,
0
,
sizeof
(
paxhdr
));
pax
.
size
=
0
;
}
while
(
1
);
ret
=
0
;
err:
buf_free
(
&
data
);
buf_free
(
&
pax
);
return
ret
;
}
int
main
(
int
argc
,
char
**
argv
)
...
...
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