1 #include <u.h>
2 #include <libc.h>
3 #include <auth.h>
4 #include <authsrv.h>
5 #include "authlocal.h"
6 
7 enum {
8 	ARgiveup = 100
9 };
10 
11 static int
12 dorpc(AuthRpc *rpc, char *verb, char *val, int len, AuthGetkey *getkey)
13 {
14 	int ret;
15 
16 	for(;;){
17 		if((ret = auth_rpc(rpc, verb, val, len)) != ARneedkey && ret != ARbadkey)
18 			return ret;
19 		if(getkey == nil)
20 			return ARgiveup;	/* don't know how */
21 		if((*getkey)(rpc->arg) < 0)
22 			return ARgiveup;	/* user punted */
23 	}
24 }
25 
26 int
27 auth_respond(void *chal, uint nchal, char *user, uint nuser, void *resp, uint nresp, AuthGetkey *getkey, char *fmt, ...)
28 {
29 	char *p, *s;
30 	va_list arg;
31 	AuthRpc *rpc;
32 	Attr *a;
33 
34 	if((rpc = auth_allocrpc()) == nil)
35 		return -1;
36 
37 	quotefmtinstall();	/* just in case */
38 	va_start(arg, fmt);
39 	p = vsmprint(fmt, arg);
40 	va_end(arg);
41 
42 	if(p==nil
43 	|| dorpc(rpc, "start", p, strlen(p), getkey) != ARok
44 	|| dorpc(rpc, "write", chal, nchal, getkey) != ARok
45 	|| dorpc(rpc, "read", nil, 0, getkey) != ARok){
46 		free(p);
47 		auth_freerpc(rpc);
48 		return -1;
49 	}
50 	free(p);
51 
52 	if(rpc->narg < nresp)
53 		nresp = rpc->narg;
54 	memmove(resp, rpc->arg, nresp);
55 
56 	if((a = auth_attr(rpc)) != nil
57 	&& (s = _strfindattr(a, "user")) != nil && strlen(s) < nuser)
58 		strcpy(user, s);
59 	else if(nuser > 0)
60 		user[0] = '\0';
61 
62 	_freeattr(a);
63 	auth_freerpc(rpc);
64 	return nresp;
65 }