1 /*
2  * This is just a repository for a password.
3  * We don't want to encourage this, there's
4  * no server side.
5  */
6 
7 #include "dat.h"
8 
9 typedef struct State State;
10 struct State 
11 {
12 	Key *key;
13 };
14 
15 enum
16 {
17 	HavePass,
18 	Maxphase,
19 };
20 
21 static char *phasenames[Maxphase] =
22 {
23 [HavePass]	"HavePass",
24 };
25 
26 static int
27 passinit(Proto *p, Fsstate *fss)
28 {
29 	int ask;
30 	Key *k;
31 	State *s;
32 
33 	k = findkey(fss, Kuser, &ask, 0, fss->attr, "%s", p->keyprompt);
34 	if(k == nil){
35 		if(ask)
36 			return RpcNeedkey;
37 		return failure(fss, nil);
38 	}
39 	setattrs(fss->attr, k->attr);
40 	s = emalloc(sizeof(*s));
41 	s->key = k;
42 	fss->ps = s;
43 	return RpcOk;
44 }
45 
46 static void
47 passclose(Fsstate *fss)
48 {
49 	State *s;
50 
51 	s = fss->ps;
52 	if(s->key)
53 		closekey(s->key);
54 	free(s);
55 }
56 
57 static int
58 passread(Fsstate *fss, void *va, uint *n)
59 {
60 	int m;
61 	char buf[500];
62 	char *pass, *user;
63 	State *s;
64 
65 	s = fss->ps;
66 	switch(fss->phase){
67 	default:
68 		return phaseerror(fss, "read");
69 
70 	case HavePass:
71 		user = strfindattr(s->key->attr, "user");
72 		pass = strfindattr(s->key->privattr, "!password");
73 		if(user==nil || pass==nil)
74 			return failure(fss, "passread cannot happen");
75 		snprint(buf, sizeof buf, "%q %q", user, pass);
76 		m = strlen(buf);
77 		if(m > *n)
78 			return toosmall(fss, m);
79 		*n = m;
80 		memmove(va, buf, m);
81 		return RpcOk;
82 	}
83 }
84 
85 static int
86 passwrite(Fsstate *fss, void*, uint)
87 {
88 	return phaseerror(fss, "write");
89 }
90 
91 Proto pass =
92 {
93 .name=		"pass",
94 .init=		passinit,
95 .write=		passwrite,
96 .read=		passread,
97 .close=		passclose,
98 .addkey=		replacekey,
99 .keyprompt=	"user? !password?",
100 };