d11a0bf7 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: key-flags.c,v 1.1 1999/12/22 15:47:48 mdw Exp $ |
4 | * |
5 | * Reading and writing key flag strings |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: key-flags.c,v $ |
33 | * Revision 1.1 1999/12/22 15:47:48 mdw |
34 | * Major key-management revision. |
35 | * |
36 | */ |
37 | |
38 | /*----- Header files ------------------------------------------------------*/ |
39 | |
40 | #include <stdlib.h> |
41 | #include <string.h> |
42 | |
43 | #include <mLib/bits.h> |
44 | #include <mLib/dstr.h> |
45 | |
46 | #include "key.h" |
47 | |
48 | /*----- Data structures ---------------------------------------------------*/ |
49 | |
50 | typedef struct key_flags { |
51 | unsigned f; |
52 | unsigned m; |
53 | } key_flags; |
54 | |
55 | /*----- Flags table -------------------------------------------------------*/ |
56 | |
57 | typedef struct flagent { |
58 | const char *name; |
59 | unsigned f; |
60 | unsigned m; |
61 | } flagent; |
62 | |
63 | static flagent flagtab[] = { |
64 | |
65 | /* --- Encoding types --- */ |
66 | |
67 | { "binary", KENC_BINARY, KF_ENCMASK }, |
68 | { "integer", KENC_MP, KF_ENCMASK }, |
69 | { "struct", KENC_STRUCT, KF_ENCMASK }, |
70 | { "encrypt", KENC_ENCRYPT, KF_ENCMASK }, |
71 | |
72 | /* --- Classes of keys --- */ |
73 | |
74 | { "shared", KCAT_SHARE, KF_CATMASK }, |
75 | { "public", KCAT_PUB, KF_CATMASK }, |
76 | { "private", KCAT_PRIV, KF_CATMASK }, |
77 | { "symmetric", KCAT_SYMM, KF_CATMASK }, |
78 | { "secret", 0, KF_NONSECRET }, |
79 | { "-secret", KF_NONSECRET, KF_NONSECRET }, |
80 | |
81 | /* --- Other flags --- */ |
82 | |
83 | { "burn", KF_BURN, KF_BURN }, |
84 | { "-burn", 0, KF_BURN }, |
85 | |
86 | /* --- End marker --- */ |
87 | |
88 | { 0, 0, 0 } |
89 | }; |
90 | |
91 | /*----- Main code ---------------------------------------------------------*/ |
92 | |
93 | /* --- @key_readflags@ --- * |
94 | * |
95 | * Arguments: @const char *p@ = pointer to string to read |
96 | * @char **pp@ = where to store the end pointer |
97 | * @unsigned *ff@ = where to store the flags |
98 | * @unsigned *mm@ = where to store the mask |
99 | * |
100 | * Returns: Zero if all went well, nonzero if there was an error. |
101 | * |
102 | * Use: Reads a flag string. |
103 | */ |
104 | |
105 | int key_readflags(const char *p, char **pp, unsigned *ff, unsigned *mm) |
106 | { |
107 | unsigned f = 0, m = 0; |
108 | |
109 | for (;;) { |
110 | size_t sz = strcspn(p, ",:"); |
111 | flagent *e, *ee = 0; |
112 | |
113 | /* --- Look up the string in the flags table --- */ |
114 | |
115 | for (e = flagtab; e->name; e++) { |
116 | if (strncmp(e->name, p, sz) == 0) { |
117 | if (e->name[sz] == 0) { |
118 | ee = e; |
119 | break; |
120 | } else if (ee) |
121 | return (KERR_BADFLAGS); |
122 | else |
123 | ee = e; |
124 | } |
125 | } |
126 | if (!ee) |
127 | return (KERR_BADFLAGS); |
128 | |
129 | /* --- Adjust the flag words --- * |
130 | * |
131 | * Ensure that the flags set are disjoint. |
132 | */ |
133 | |
134 | if (m & ee->m) |
135 | return (KERR_BADFLAGS); |
136 | m |= ee->m; |
137 | f |= ee->f; |
138 | p += sz; |
139 | if (*p == 0 || *p == ':') |
140 | break; |
141 | p++; |
142 | } |
143 | |
144 | /* --- Report the results --- */ |
145 | |
146 | if (ff) *ff = f; |
147 | if (mm) *mm = m; |
148 | if (pp) *pp = (char *)p; |
149 | return (0); |
150 | } |
151 | |
152 | /* --- @key_writeflags@ --- * |
153 | * |
154 | * Arguments: @unsigned f@ = flags to write |
155 | * @dstr *d@ = pointer to destination string |
156 | * |
157 | * Returns: --- |
158 | * |
159 | * Use: Emits a flags word as a string representation. |
160 | */ |
161 | |
162 | void key_writeflags(unsigned f, dstr *d) |
163 | { |
164 | int del = 0; |
165 | flagent *e; |
166 | unsigned m = 0; |
167 | |
168 | for (e = flagtab; e->name; e++) { |
169 | if (m & e->m || e->name[0] == '-' || (f & e->m) != e->f) |
170 | continue; |
171 | if (del) |
172 | DPUTC(d, ','); |
173 | DPUTS(d, e->name); |
174 | m |= e->m; |
175 | del = 1; |
176 | } |
177 | } |
178 | |
179 | /*----- That's all, folks -------------------------------------------------*/ |