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Re: epan_base64_decode(): failure when string contains a NUL character
From: Jakub Zawadzki <darkjames-ws () darkjames pl>
Date: Sat, 20 Apr 2013 11:55:54 +0200
Hi, On Wed, Apr 17, 2013 at 10:27:42PM +0200, Uli Heilmeier wrote:
With the PLAIN mechanism the packet has a base64 encoded string containing: [authorization user](\x00)[authentication user](\x00)[password] For example: dGVzdAB0ZXN0ADEyMzQ= contains test(NUL)test(NUL)1234 I tried to decode the base64 string with the epan_base64_decode() function (from epan/base64.h). Unfortunately this fails. I only get a wrong three bytes long string. I guess the problem is the NUL character as a delimiter. Do you have an idea if this is bug in the epan_base64_decode() function or do I have to do the decoding another way?
From C interactive shell (gdb):
(gdb) call $x = (char *) strdup("dGVzdAB0ZXN0ADEyMzQ=") $1 = 0x65b0e0 "dGVzdAB0ZXN0ADEyMzQ=" (gdb) call epan_base64_decode($x) $2 = 14 (gdb) x/14c $x 0x65b0e0: 116 't' 101 'e' 115 's' 116 't' 0 '\000' 116 't' 101 'e' 115 's' 0x65b0e8: 116 't' 0 '\000' 49 '1' 50 '2' 51 '3' 52 '4' (gdb) call $x $3 = 0x65b0e0 "test" (gdb) call $x + 5 $4 = 0x65b0e5 "test" (gdb) call $x + 5 + 5 $5 = 0x65b0ea "1234" Seems to be working ok, can you attach your code? Regards, Jakub Zawadzki ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-request () wireshark org?subject=unsubscribe
Current thread:
- epan_base64_decode(): failure when string contains a NUL character Uli Heilmeier (Apr 17)
- Re: epan_base64_decode(): failure when string contains a NUL character Evan Huus (Apr 17)
- Re: epan_base64_decode(): failure when string contains a NUL character Jakub Zawadzki (Apr 20)
- Re: epan_base64_decode(): failure when string contains a NUL character Uli Heilmeier (Apr 21)
- Re: epan_base64_decode(): failure when string contains a NUL character Evan Huus (Apr 21)
- Re: epan_base64_decode(): failure when string contains a NUL character Uli Heilmeier (Apr 24)
- Re: epan_base64_decode(): failure when string contains a NUL character Uli Heilmeier (Apr 21)