|
Packit |
6c4009 |
/*
|
|
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6c4009 |
* Copyright (c) 1996-1999 by Internet Software Consortium.
|
|
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6c4009 |
*
|
|
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6c4009 |
* Permission to use, copy, modify, and distribute this software for any
|
|
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6c4009 |
* purpose with or without fee is hereby granted, provided that the above
|
|
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6c4009 |
* copyright notice and this permission notice appear in all copies.
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|
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6c4009 |
*
|
|
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6c4009 |
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
|
|
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6c4009 |
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
|
|
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6c4009 |
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
|
|
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6c4009 |
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
|
|
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6c4009 |
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
|
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6c4009 |
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
|
|
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6c4009 |
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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6c4009 |
* SOFTWARE.
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Packit |
6c4009 |
*/
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6c4009 |
|
|
Packit |
6c4009 |
/*
|
|
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6c4009 |
* Portions Copyright (c) 1995 by International Business Machines, Inc.
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6c4009 |
*
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|
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6c4009 |
* International Business Machines, Inc. (hereinafter called IBM) grants
|
|
Packit |
6c4009 |
* permission under its copyrights to use, copy, modify, and distribute this
|
|
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6c4009 |
* Software with or without fee, provided that the above copyright notice and
|
|
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6c4009 |
* all paragraphs of this notice appear in all copies, and that the name of IBM
|
|
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6c4009 |
* not be used in connection with the marketing of any product incorporating
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|
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6c4009 |
* the Software or modifications thereof, without specific, written prior
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|
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6c4009 |
* permission.
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6c4009 |
*
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|
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6c4009 |
* To the extent it has a right to do so, IBM grants an immunity from suit
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|
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6c4009 |
* under its patents, if any, for the use, sale or manufacture of products to
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|
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6c4009 |
* the extent that such products are used for performing Domain Name System
|
|
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6c4009 |
* dynamic updates in TCP/IP networks by means of the Software. No immunity is
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|
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6c4009 |
* granted for any product per se or for any other function of any product.
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6c4009 |
*
|
|
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6c4009 |
* THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES,
|
|
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6c4009 |
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
|
|
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6c4009 |
* PARTICULAR PURPOSE. IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL,
|
|
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6c4009 |
* DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING
|
|
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6c4009 |
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN
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|
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6c4009 |
* IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES.
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6c4009 |
*/
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|
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#include <sys/types.h>
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6c4009 |
#include <sys/param.h>
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6c4009 |
#include <sys/socket.h>
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6c4009 |
|
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6c4009 |
#include <netinet/in.h>
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#include <arpa/inet.h>
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6c4009 |
#include <arpa/nameser.h>
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6c4009 |
|
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6c4009 |
#include <ctype.h>
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6c4009 |
#include <resolv.h>
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6c4009 |
#include <stdio.h>
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6c4009 |
#include <stdlib.h>
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6c4009 |
#include <string.h>
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6c4009 |
|
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#define Assert(Cond) if (!(Cond)) abort()
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|
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6c4009 |
static const char Base64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
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static const char Pad64 = '=';
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|
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/* (From RFC1521 and draft-ietf-dnssec-secext-03.txt)
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6c4009 |
The following encoding technique is taken from RFC 1521 by Borenstein
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6c4009 |
and Freed. It is reproduced here in a slightly edited form for
|
|
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6c4009 |
convenience.
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6c4009 |
|
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6c4009 |
A 65-character subset of US-ASCII is used, enabling 6 bits to be
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6c4009 |
represented per printable character. (The extra 65th character, "=",
|
|
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6c4009 |
is used to signify a special processing function.)
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|
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6c4009 |
|
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6c4009 |
The encoding process represents 24-bit groups of input bits as output
|
|
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6c4009 |
strings of 4 encoded characters. Proceeding from left to right, a
|
|
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6c4009 |
24-bit input group is formed by concatenating 3 8-bit input groups.
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6c4009 |
These 24 bits are then treated as 4 concatenated 6-bit groups, each
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|
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6c4009 |
of which is translated into a single digit in the base64 alphabet.
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|
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6c4009 |
|
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6c4009 |
Each 6-bit group is used as an index into an array of 64 printable
|
|
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6c4009 |
characters. The character referenced by the index is placed in the
|
|
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6c4009 |
output string.
|
|
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6c4009 |
|
|
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6c4009 |
Table 1: The Base64 Alphabet
|
|
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6c4009 |
|
|
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6c4009 |
Value Encoding Value Encoding Value Encoding Value Encoding
|
|
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6c4009 |
0 A 17 R 34 i 51 z
|
|
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6c4009 |
1 B 18 S 35 j 52 0
|
|
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6c4009 |
2 C 19 T 36 k 53 1
|
|
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6c4009 |
3 D 20 U 37 l 54 2
|
|
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6c4009 |
4 E 21 V 38 m 55 3
|
|
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6c4009 |
5 F 22 W 39 n 56 4
|
|
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6c4009 |
6 G 23 X 40 o 57 5
|
|
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6c4009 |
7 H 24 Y 41 p 58 6
|
|
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6c4009 |
8 I 25 Z 42 q 59 7
|
|
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6c4009 |
9 J 26 a 43 r 60 8
|
|
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6c4009 |
10 K 27 b 44 s 61 9
|
|
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6c4009 |
11 L 28 c 45 t 62 +
|
|
Packit |
6c4009 |
12 M 29 d 46 u 63 /
|
|
Packit |
6c4009 |
13 N 30 e 47 v
|
|
Packit |
6c4009 |
14 O 31 f 48 w (pad) =
|
|
Packit |
6c4009 |
15 P 32 g 49 x
|
|
Packit |
6c4009 |
16 Q 33 h 50 y
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
Special processing is performed if fewer than 24 bits are available
|
|
Packit |
6c4009 |
at the end of the data being encoded. A full encoding quantum is
|
|
Packit |
6c4009 |
always completed at the end of a quantity. When fewer than 24 input
|
|
Packit |
6c4009 |
bits are available in an input group, zero bits are added (on the
|
|
Packit |
6c4009 |
right) to form an integral number of 6-bit groups. Padding at the
|
|
Packit |
6c4009 |
end of the data is performed using the '=' character.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
Since all base64 input is an integral number of octets, only the
|
|
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6c4009 |
-------------------------------------------------
|
|
Packit |
6c4009 |
following cases can arise:
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
(1) the final quantum of encoding input is an integral
|
|
Packit |
6c4009 |
multiple of 24 bits; here, the final unit of encoded
|
|
Packit |
6c4009 |
output will be an integral multiple of 4 characters
|
|
Packit |
6c4009 |
with no "=" padding,
|
|
Packit |
6c4009 |
(2) the final quantum of encoding input is exactly 8 bits;
|
|
Packit |
6c4009 |
here, the final unit of encoded output will be two
|
|
Packit |
6c4009 |
characters followed by two "=" padding characters, or
|
|
Packit |
6c4009 |
(3) the final quantum of encoding input is exactly 16 bits;
|
|
Packit |
6c4009 |
here, the final unit of encoded output will be three
|
|
Packit |
6c4009 |
characters followed by one "=" padding character.
|
|
Packit |
6c4009 |
*/
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
int
|
|
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6c4009 |
b64_ntop(u_char const *src, size_t srclength, char *target, size_t targsize) {
|
|
Packit |
6c4009 |
size_t datalength = 0;
|
|
Packit |
6c4009 |
u_char input[3];
|
|
Packit |
6c4009 |
u_char output[4];
|
|
Packit |
6c4009 |
size_t i;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
while (2 < srclength) {
|
|
Packit |
6c4009 |
input[0] = *src++;
|
|
Packit |
6c4009 |
input[1] = *src++;
|
|
Packit |
6c4009 |
input[2] = *src++;
|
|
Packit |
6c4009 |
srclength -= 3;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
output[0] = input[0] >> 2;
|
|
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6c4009 |
output[1] = ((input[0] & 0x03) << 4) + (input[1] >> 4);
|
|
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6c4009 |
output[2] = ((input[1] & 0x0f) << 2) + (input[2] >> 6);
|
|
Packit |
6c4009 |
output[3] = input[2] & 0x3f;
|
|
Packit |
6c4009 |
Assert(output[0] < 64);
|
|
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6c4009 |
Assert(output[1] < 64);
|
|
Packit |
6c4009 |
Assert(output[2] < 64);
|
|
Packit |
6c4009 |
Assert(output[3] < 64);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (datalength + 4 > targsize)
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
target[datalength++] = Base64[output[0]];
|
|
Packit |
6c4009 |
target[datalength++] = Base64[output[1]];
|
|
Packit |
6c4009 |
target[datalength++] = Base64[output[2]];
|
|
Packit |
6c4009 |
target[datalength++] = Base64[output[3]];
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Now we worry about padding. */
|
|
Packit |
6c4009 |
if (0 != srclength) {
|
|
Packit |
6c4009 |
/* Get what's left. */
|
|
Packit |
6c4009 |
input[0] = input[1] = input[2] = '\0';
|
|
Packit |
6c4009 |
for (i = 0; i < srclength; i++)
|
|
Packit |
6c4009 |
input[i] = *src++;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
output[0] = input[0] >> 2;
|
|
Packit |
6c4009 |
output[1] = ((input[0] & 0x03) << 4) + (input[1] >> 4);
|
|
Packit |
6c4009 |
output[2] = ((input[1] & 0x0f) << 2) + (input[2] >> 6);
|
|
Packit |
6c4009 |
Assert(output[0] < 64);
|
|
Packit |
6c4009 |
Assert(output[1] < 64);
|
|
Packit |
6c4009 |
Assert(output[2] < 64);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (datalength + 4 > targsize)
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
target[datalength++] = Base64[output[0]];
|
|
Packit |
6c4009 |
target[datalength++] = Base64[output[1]];
|
|
Packit |
6c4009 |
if (srclength == 1)
|
|
Packit |
6c4009 |
target[datalength++] = Pad64;
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
target[datalength++] = Base64[output[2]];
|
|
Packit |
6c4009 |
target[datalength++] = Pad64;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
if (datalength >= targsize)
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
target[datalength] = '\0'; /* Returned value doesn't count \0. */
|
|
Packit |
6c4009 |
return (datalength);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
libresolv_hidden_def (b64_ntop)
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* skips all whitespace anywhere.
|
|
Packit |
6c4009 |
converts characters, four at a time, starting at (or after)
|
|
Packit |
6c4009 |
src from base - 64 numbers into three 8 bit bytes in the target area.
|
|
Packit |
6c4009 |
it returns the number of data bytes stored at the target, or -1 on error.
|
|
Packit |
6c4009 |
*/
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
int
|
|
Packit |
6c4009 |
b64_pton (char const *src, u_char *target, size_t targsize)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
int tarindex, state, ch;
|
|
Packit |
6c4009 |
char *pos;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
state = 0;
|
|
Packit |
6c4009 |
tarindex = 0;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
while ((ch = *src++) != '\0') {
|
|
Packit |
6c4009 |
if (isspace(ch)) /* Skip whitespace anywhere. */
|
|
Packit |
6c4009 |
continue;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (ch == Pad64)
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
pos = strchr(Base64, ch);
|
|
Packit |
6c4009 |
if (pos == 0) /* A non-base64 character. */
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
switch (state) {
|
|
Packit |
6c4009 |
case 0:
|
|
Packit |
6c4009 |
if (target) {
|
|
Packit |
6c4009 |
if ((size_t)tarindex >= targsize)
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
target[tarindex] = (pos - Base64) << 2;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
state = 1;
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
case 1:
|
|
Packit |
6c4009 |
if (target) {
|
|
Packit |
6c4009 |
if ((size_t)tarindex + 1 >= targsize)
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
target[tarindex] |= (pos - Base64) >> 4;
|
|
Packit |
6c4009 |
target[tarindex+1] = ((pos - Base64) & 0x0f)
|
|
Packit |
6c4009 |
<< 4 ;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
tarindex++;
|
|
Packit |
6c4009 |
state = 2;
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
case 2:
|
|
Packit |
6c4009 |
if (target) {
|
|
Packit |
6c4009 |
if ((size_t)tarindex + 1 >= targsize)
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
target[tarindex] |= (pos - Base64) >> 2;
|
|
Packit |
6c4009 |
target[tarindex+1] = ((pos - Base64) & 0x03)
|
|
Packit |
6c4009 |
<< 6;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
tarindex++;
|
|
Packit |
6c4009 |
state = 3;
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
case 3:
|
|
Packit |
6c4009 |
if (target) {
|
|
Packit |
6c4009 |
if ((size_t)tarindex >= targsize)
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
target[tarindex] |= (pos - Base64);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
tarindex++;
|
|
Packit |
6c4009 |
state = 0;
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
default:
|
|
Packit |
6c4009 |
abort();
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/*
|
|
Packit |
6c4009 |
* We are done decoding Base-64 chars. Let's see if we ended
|
|
Packit |
6c4009 |
* on a byte boundary, and/or with erroneous trailing characters.
|
|
Packit |
6c4009 |
*/
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (ch == Pad64) { /* We got a pad char. */
|
|
Packit |
6c4009 |
ch = *src++; /* Skip it, get next. */
|
|
Packit |
6c4009 |
switch (state) {
|
|
Packit |
6c4009 |
case 0: /* Invalid = in first position */
|
|
Packit |
6c4009 |
case 1: /* Invalid = in second position */
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
case 2: /* Valid, means one byte of info */
|
|
Packit |
6c4009 |
/* Skip any number of spaces. */
|
|
Packit |
6c4009 |
for ((void)NULL; ch != '\0'; ch = *src++)
|
|
Packit |
6c4009 |
if (!isspace(ch))
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
/* Make sure there is another trailing = sign. */
|
|
Packit |
6c4009 |
if (ch != Pad64)
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
ch = *src++; /* Skip the = */
|
|
Packit |
6c4009 |
/* Fall through to "single trailing =" case. */
|
|
Packit |
6c4009 |
/* FALLTHROUGH */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
case 3: /* Valid, means two bytes of info */
|
|
Packit |
6c4009 |
/*
|
|
Packit |
6c4009 |
* We know this char is an =. Is there anything but
|
|
Packit |
6c4009 |
* whitespace after it?
|
|
Packit |
6c4009 |
*/
|
|
Packit |
6c4009 |
for ((void)NULL; ch != '\0'; ch = *src++)
|
|
Packit |
6c4009 |
if (!isspace(ch))
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/*
|
|
Packit |
6c4009 |
* Now make sure for cases 2 and 3 that the "extra"
|
|
Packit |
6c4009 |
* bits that slopped past the last full byte were
|
|
Packit |
6c4009 |
* zeros. If we don't check them, they become a
|
|
Packit |
6c4009 |
* subliminal channel.
|
|
Packit |
6c4009 |
*/
|
|
Packit |
6c4009 |
if (target && target[tarindex] != 0)
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
} else {
|
|
Packit |
6c4009 |
/*
|
|
Packit |
6c4009 |
* We ended by seeing the end of the string. Make sure we
|
|
Packit |
6c4009 |
* have no partial bytes lying around.
|
|
Packit |
6c4009 |
*/
|
|
Packit |
6c4009 |
if (state != 0)
|
|
Packit |
6c4009 |
return (-1);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return (tarindex);
|
|
Packit |
6c4009 |
}
|