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1 | /* -*-c-*- |
2 | * |
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3 | * $Id$ |
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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 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include <stdlib.h> |
33 | #include <string.h> |
34 | |
35 | #include <mLib/bits.h> |
36 | #include <mLib/dstr.h> |
37 | |
38 | #include "key.h" |
39 | |
40 | /*----- Data structures ---------------------------------------------------*/ |
41 | |
42 | typedef struct key_flags { |
43 | unsigned f; |
44 | unsigned m; |
45 | } key_flags; |
46 | |
47 | /*----- Flags table -------------------------------------------------------*/ |
48 | |
49 | typedef struct flagent { |
50 | const char *name; |
51 | unsigned f; |
52 | unsigned m; |
53 | } flagent; |
54 | |
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55 | static const flagent flagtab[] = { |
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56 | |
57 | /* --- Encoding types --- */ |
58 | |
59 | { "binary", KENC_BINARY, KF_ENCMASK }, |
60 | { "integer", KENC_MP, KF_ENCMASK }, |
61 | { "struct", KENC_STRUCT, KF_ENCMASK }, |
62 | { "encrypt", KENC_ENCRYPT, KF_ENCMASK }, |
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63 | { "string", KENC_STRING, KF_ENCMASK }, |
64 | { "ec", KENC_EC, KF_ENCMASK }, |
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65 | |
66 | /* --- Classes of keys --- */ |
67 | |
68 | { "shared", KCAT_SHARE, KF_CATMASK }, |
69 | { "public", KCAT_PUB, KF_CATMASK }, |
70 | { "private", KCAT_PRIV, KF_CATMASK }, |
71 | { "symmetric", KCAT_SYMM, KF_CATMASK }, |
72 | { "secret", 0, KF_NONSECRET }, |
73 | { "-secret", KF_NONSECRET, KF_NONSECRET }, |
74 | |
75 | /* --- Other flags --- */ |
76 | |
77 | { "burn", KF_BURN, KF_BURN }, |
78 | { "-burn", 0, KF_BURN }, |
79 | |
80 | /* --- End marker --- */ |
81 | |
82 | { 0, 0, 0 } |
83 | }; |
84 | |
85 | /*----- Main code ---------------------------------------------------------*/ |
86 | |
87 | /* --- @key_readflags@ --- * |
88 | * |
89 | * Arguments: @const char *p@ = pointer to string to read |
90 | * @char **pp@ = where to store the end pointer |
91 | * @unsigned *ff@ = where to store the flags |
92 | * @unsigned *mm@ = where to store the mask |
93 | * |
94 | * Returns: Zero if all went well, nonzero if there was an error. |
95 | * |
96 | * Use: Reads a flag string. |
97 | */ |
98 | |
99 | int key_readflags(const char *p, char **pp, unsigned *ff, unsigned *mm) |
100 | { |
101 | unsigned f = 0, m = 0; |
102 | |
103 | for (;;) { |
104 | size_t sz = strcspn(p, ",:"); |
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105 | const flagent *e, *ee = 0; |
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106 | |
107 | /* --- Look up the string in the flags table --- */ |
108 | |
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109 | if (sz == 4 && strncmp(p, "none", 4) == 0) |
110 | goto next; |
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111 | for (e = flagtab; e->name; e++) { |
112 | if (strncmp(e->name, p, sz) == 0) { |
113 | if (e->name[sz] == 0) { |
114 | ee = e; |
115 | break; |
116 | } else if (ee) |
117 | return (KERR_BADFLAGS); |
118 | else |
119 | ee = e; |
120 | } |
121 | } |
122 | if (!ee) |
123 | return (KERR_BADFLAGS); |
124 | |
125 | /* --- Adjust the flag words --- * |
126 | * |
127 | * Ensure that the flags set are disjoint. |
128 | */ |
129 | |
130 | if (m & ee->m) |
131 | return (KERR_BADFLAGS); |
132 | m |= ee->m; |
133 | f |= ee->f; |
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134 | next: |
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135 | p += sz; |
136 | if (*p == 0 || *p == ':') |
137 | break; |
138 | p++; |
139 | } |
140 | |
141 | /* --- Report the results --- */ |
142 | |
143 | if (ff) *ff = f; |
144 | if (mm) *mm = m; |
145 | if (pp) *pp = (char *)p; |
146 | return (0); |
147 | } |
148 | |
149 | /* --- @key_writeflags@ --- * |
150 | * |
151 | * Arguments: @unsigned f@ = flags to write |
152 | * @dstr *d@ = pointer to destination string |
153 | * |
154 | * Returns: --- |
155 | * |
156 | * Use: Emits a flags word as a string representation. |
157 | */ |
158 | |
159 | void key_writeflags(unsigned f, dstr *d) |
160 | { |
161 | int del = 0; |
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162 | const flagent *e; |
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163 | unsigned m = 0; |
164 | |
165 | for (e = flagtab; e->name; e++) { |
166 | if (m & e->m || e->name[0] == '-' || (f & e->m) != e->f) |
167 | continue; |
168 | if (del) |
169 | DPUTC(d, ','); |
170 | DPUTS(d, e->name); |
171 | m |= e->m; |
172 | del = 1; |
173 | } |
174 | } |
175 | |
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176 | /* --- @key_match@ --- * |
177 | * |
178 | * Arguments: @key_data *k@ = pointer to key data block |
179 | * @const key_filter *kf@ = pointer to filter block |
180 | * |
181 | * Returns: Nonzero if the key matches the filter. |
182 | * |
183 | * Use: Checks whether a key matches a filter. |
184 | */ |
185 | |
186 | int key_match(key_data *k, const key_filter *kf) |
187 | { |
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188 | key_subkeyiter i; |
189 | const char *tag; |
190 | key_data *kd; |
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191 | |
192 | if (!kf) |
193 | return (1); |
194 | if ((k->e & KF_ENCMASK) != KENC_STRUCT) |
195 | return ((k->e & kf->m) == kf->f); |
196 | |
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197 | for (key_mksubkeyiter(&i, k); key_nextsubkey(&i, &tag, &kd); ) { |
198 | if (key_match(kd, kf)) |
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199 | return (1); |
200 | } |
201 | return (0); |
202 | } |
203 | |
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204 | /*----- That's all, folks -------------------------------------------------*/ |