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dbfe3c19 DK |
1 | /* |
2 | * Copyright (c) 2008, Dave Korn. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * A copy of the GNU General Public License can be found at | |
10 | * http://www.gnu.org/ | |
11 | * | |
12 | * This implements the ExtraKeysSetting class, which persists and reads | |
13 | * in (and saves) extra public DSA signing keys for the verification process. | |
14 | * It stores them all in a contiguous memory buffer. Each is one line of | |
15 | * ASCII text terminated by LF. THERE IS NO NUL-TERMINATION HERE, TAKE CARE! | |
16 | * The buffer is sized to the exact size of the content including the terminating | |
17 | * LF of the last entry. There is no zero after it. After reading the file, | |
18 | * any partial last line is truncated. | |
19 | * | |
20 | * Written by Dave Korn <dave.korn.cygwin@gmail.com> | |
21 | * | |
22 | */ | |
23 | ||
dbfe3c19 | 24 | #include <stdlib.h> |
ef3be327 | 25 | #include <string.h> |
dbfe3c19 DK |
26 | #include "UserSettings.h" |
27 | #include "io_stream.h" | |
28 | #include "KeysSetting.h" | |
29 | ||
f26f525f CF |
30 | ExtraKeysSetting *ExtraKeysSetting::global; |
31 | ||
32 | ExtraKeysSetting::ExtraKeysSetting (): | |
33 | keybuffer (NULL), bufsize (0), numkeys (0) | |
dbfe3c19 | 34 | { |
f26f525f CF |
35 | global = this; |
36 | const char *p = UserSettings::instance().get ("extrakeys"); | |
37 | if (p) | |
dbfe3c19 | 38 | { |
e8c42399 | 39 | bufsize = strlen (p) + 1; // Include final NUL. |
f26f525f | 40 | keybuffer = strdup (p); |
e8c42399 KB |
41 | // Replace final NUL by LF. |
42 | keybuffer[bufsize - 1] = 0x0a; | |
f26f525f CF |
43 | // Calling count_keys gets the count but also sizes the buffer |
44 | // correctly, discarding any trailing non-LF-terminated data. | |
45 | bufsize = count_keys (); | |
dbfe3c19 | 46 | } |
dbfe3c19 DK |
47 | } |
48 | ||
f26f525f | 49 | ExtraKeysSetting::~ExtraKeysSetting () |
dbfe3c19 | 50 | { |
f26f525f | 51 | if (keybuffer) |
e8c42399 KB |
52 | { |
53 | // Replace final LF by NUL. | |
54 | keybuffer[bufsize - 1] = '\0'; | |
55 | UserSettings::instance().set ("extrakeys", keybuffer); | |
56 | } | |
dbfe3c19 DK |
57 | } |
58 | ||
59 | void | |
60 | ExtraKeysSetting::flush (void) | |
61 | { | |
62 | if (bufsize) | |
63 | delete [] keybuffer; | |
64 | keybuffer = 0; | |
65 | bufsize = 0; | |
66 | numkeys = 0; | |
67 | } | |
68 | ||
69 | void | |
70 | ExtraKeysSetting::realloc (size_t newbufsize) | |
71 | { | |
72 | char *newbuf = new char[newbufsize]; | |
73 | if (bufsize) | |
74 | { | |
75 | memcpy (newbuf, keybuffer, newbufsize < bufsize ? newbufsize : bufsize); | |
76 | delete [] keybuffer; | |
77 | } | |
78 | keybuffer = newbuf; | |
79 | bufsize = newbufsize; | |
80 | } | |
81 | ||
82 | size_t | |
83 | ExtraKeysSetting::count_keys (void) | |
84 | { | |
85 | size_t offs = 0, size = 0; | |
86 | numkeys = 0; | |
87 | while (offs < bufsize) | |
88 | if (keybuffer[offs++] == 0x0a) | |
89 | { | |
90 | size = offs; | |
91 | ++numkeys; | |
92 | } | |
93 | return size; | |
94 | } | |
95 | ||
96 | size_t | |
97 | ExtraKeysSetting::num_keys (void) | |
98 | { | |
99 | return numkeys; | |
100 | } | |
101 | ||
102 | const char * | |
103 | ExtraKeysSetting::get_key (size_t num, size_t *size) | |
104 | { | |
105 | if (!numkeys || (num >= numkeys)) | |
106 | return NULL; | |
107 | ||
108 | const char *ptr = keybuffer; | |
109 | while (num--) | |
110 | while (*ptr++ != 0x0a); | |
111 | ||
112 | // Count its size if requested. | |
113 | if (size) | |
114 | { | |
115 | const char *ptr2 = ptr; | |
116 | while (num--) | |
117 | if (*ptr2 != 0x0a) | |
118 | ++ptr2; | |
119 | else | |
120 | break; | |
121 | *size = ptr2 - ptr; | |
122 | } | |
123 | return ptr; | |
124 | } | |
125 | ||
126 | void | |
127 | ExtraKeysSetting::add_unique_key (const char *key) | |
128 | { | |
129 | size_t osize = bufsize; | |
130 | realloc (bufsize + strlen (key) + 1); | |
131 | strcpy (keybuffer + osize, key); | |
132 | keybuffer[bufsize - 1] = 0x0a; | |
133 | ++numkeys; | |
134 | } | |
135 | ||
136 | void | |
137 | ExtraKeysSetting::add_key (const char *key) | |
138 | { | |
139 | /* Only add key if we don't already have it. */ | |
140 | const char *ptr = keybuffer; | |
141 | size_t remain = bufsize; | |
142 | size_t keylen = strlen (key); | |
143 | ||
144 | while (remain >= keylen) | |
145 | { | |
146 | if (memcmp (ptr, key, keylen) == 0) | |
147 | return; | |
148 | ||
149 | while (remain--) | |
150 | if (*ptr++ == 0x0a) | |
151 | break; | |
152 | } | |
153 | add_unique_key (key); | |
154 | } |