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Remote Procedure Call Programming Guide Page 23

nuser(rqstp, transp)

struct svc_req *rqstp;

SVCXPRT *transp;

{

struct authunix_parms *unix_cred;

int uid;

unsigned long nusers;

* we don’t care about authentication for null proc

if (rqstp->rq_proc == NULLPROC) {

if (!svc_sendreply(transp, xdr_void, 0)) {

fprintf(stderr, "can’t reply to RPC call\n");

return (1);

}

return;

}

* now get the uid

switch (rqstp->rq_cred.oa_flavor) {

case AUTH_UNIX:

unix_cred =

(struct authunix_parms *)rqstp->rq_clntcred;

uid = unix_cred->aup_uid;

break;

case AUTH_NULL:

default:

svcerr_weakauth(transp);

return;

}

switch (rqstp->rq_proc) {

case RUSERSPROC_NUM:

* make sure caller is allowed to call this proc

if (uid == 16) {

svcerr_systemerr(transp);

return;

}

* Code here to compute the number of users

* and assign it to the variable nusers

if (!svc_sendreply(transp, xdr_u_long, &nusers)) {

fprintf(stderr, "can’t reply to RPC call\n");

return (1);

}

return;

default:

svcerr_noproc(transp);

return;

}

A few things should be noted here. First, it is customary not to check the authentication parameters associ-

ated with the NULLPROC (procedure number zero). Second, if the authentication parameter’s type is not

suitable for your service, you should call svcerr_weakauth(). And ﬁnally, the service protocol itself should

return status for access denied; in the case of our example, the protocol does not have such a status, so we

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RPC -WR5441 Specifiche Pagina 23

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