Well -- I figured out how to enable LEAP without using
Cisco's software (since they haven't managed to compile
theirs for ARM and I need LEAP to make my iPAQ useful.)

Cisco was kind enough to compile their tools with -g
leaving lots of goodies waiting to be found in an objdump
of their binaries.
With the help of objdump, gdb, driver source, and a venti
iced mocha + 3 extra shots, I managed to hack up something
that works for me -- my code isn't cleaned up and has
chunks of the environment here hard coded in so I'm not
going to post it here, maybe if I get some sleep and there's
no pressing emergencies at work the next couple of days
I'll clean it up and generalize it. The key details follow.

Details:

This struct is necessary:

typedef struct {
        u16 len; /* sizeof(UserPass) */
        u16 act; /* strlen(data) */
        unsigned char data[32];
} UserPass;

(it is tdsRidLeapUsername and tdsRidLeapPassword if you
are looking at an objdump from one of Cisco's binary tools,
they're the same struct with different names. This definition
was found by searching with google for tdsRidLeapUsername.)
(let there be:
ConfigRid cfg; UserPass up;)

The first thing that needs to be done is set the card config
for your environment using AIROGCFG and AIROPCFG commands
to AIROIOCTL. The key portion of this is setting
        cfg.authType = 0x1101 /* found with airorid eth0 1 on
                                        my x86 */

Then use the UserPass "up" with username in up.data as data for
a AIROPLEAPUSR command to AIROIOCTL.

Now -- take the password, assuming the passwd is c1...cn
fill an array with {c1, 0x0, c2, 0x0,...,cn,0x0} and compute
it's md4 checksum, md4p1. now compute the md4 checksum of md4p1
and let that be md4p2. concatenate md4p1 and md4p2 into
the data element of a UserPass struct (each is 16 bytes),
set UserPass.act = 32 and pass it as data to a AIROPLEAPPASS
AIROIOCTL.

Feel free to e-mail me with any questions.
If i get some free time, I might try to write some clones of
the commandline tools from cisco.

-Charlie
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