/*  PCNFSD functions

    ©1999 Joseph Walton

    This software is distributed under the terms of the GNU General Public
    License; either version 2 of the License, or (at your option) any
    later version.
*/

/*
   Only one PCNFSD procedure is actually supported - auth.
    This may be of some use as it is, or it may be of use
    as a basis for further development.
*/

#include "rpc.h"
#include "pcnfsd.h"

static void decode(STRPTR s);

int pcnfsd_procedure(struct Call *call, int32 *ptr, int32 *limit,
    int32 *rptr, int32 *rlimit)
{
    if (call->c_version != PCNFSD_VERSION) {
        *rptr++ = P_ENUM(PROG_MISMATCH);
        *rptr++ = P_UINT(PCNFSD_VERSION);
        *rptr = P_UINT(PCNFSD_VERSION);
        return 8;
    }

    switch (call->c_procedure) {
        case PCNFSD_PROC_NULL:
            *rptr = P_ENUM(SUCCESS);
            return 6;

        case PCNFSD_PROC_AUTH:
        {
            /* This is what you'd do if you were going to do anything
                with the usercode and password supplied. */

            char identBuffer[IDENTLEN + 1],
                pwBuffer[PASSWORDLEN + 1];

            ptr = getString(ptr, limit, identBuffer, sizeof(identBuffer));
            ptr = getString(ptr, limit, pwBuffer, sizeof(pwBuffer));

            if (!ptr) {
                *rptr = P_ENUM(GARBAGE_ARGS);
                return 6;
            }

            decode(identBuffer);
            decode(pwBuffer);

            /* Frankly, we're not bothered what they said */
            *rptr++ = P_ENUM(SUCCESS);
            *rptr++ = P_ENUM(AUTH_RES_FAKE);
            *rptr++ = P_UINT(UID_NOBODY);
            *rptr = P_UINT(GID_NOGROUP);
            return 9;
        }

        default:
            *rptr = P_ENUM(PROC_UNAVAIL);
            return 6;
    }
}

/* The strings passed are encoded in a rather simple-minded fashion. */
static void decode(STRPTR s)
{
    while (*s) {
        *s++ = (*s ^ 0x5b) & 0x7f;
    }
}