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1 | /* -*-c-*- |
2 | * |
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3 | * Handling of file attributes |
4 | * |
5 | * (c) 1999 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
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10 | * This file is part of the `fwd' port forwarder. |
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11 | * |
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12 | * `fwd' is free software; you can redistribute it and/or modify |
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13 | * it under the terms of the GNU General Public License as published by |
14 | * the Free Software Foundation; either version 2 of the License, or |
15 | * (at your option) any later version. |
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16 | * |
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17 | * `fwd' is distributed in the hope that it will be useful, |
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18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU General Public License |
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23 | * along with `fwd'; if not, write to the Free Software Foundation, |
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24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
25 | */ |
26 | |
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27 | #include "fwd.h" |
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28 | |
29 | /*----- Global variables --------------------------------------------------*/ |
30 | |
31 | fattr fattr_global; |
32 | |
33 | /*----- Main code ---------------------------------------------------------*/ |
34 | |
35 | /* --- @fattr_init@ --- * |
36 | * |
37 | * Arguments: @fattr *f@ = pointer to file attributes |
38 | * |
39 | * Returns: --- |
40 | * |
41 | * Use: Initializes a set of file attributes to default values. |
42 | */ |
43 | |
44 | void fattr_init(fattr *f) |
45 | { |
46 | unsigned um = umask(0); |
47 | umask(um); |
48 | f->mode = 0666 & ~um; |
49 | f->uid = -1; |
50 | f->gid = -1; |
51 | } |
52 | |
53 | /* --- @fattr_option@ --- * |
54 | * |
55 | * Arguments: @scanner *sc@ = pointer to scanner to read |
56 | * @fattr *f@ = pointer to file attributes to set |
57 | * |
58 | * Returns: Whether the option was claimed. |
59 | * |
60 | * Use: Reads file attributes from a scanner. |
61 | */ |
62 | |
63 | int fattr_option(scanner *sc, fattr *f) |
64 | { |
65 | CONF_BEGIN(sc, "fattr", "file attribute") |
66 | |
67 | /* --- Read a file mode specification --- */ |
68 | |
69 | if (strcmp(sc->d.buf, "mode") == 0) { |
70 | unsigned mode = 0; |
71 | |
72 | /* --- Gobble an optional `=' sign --- */ |
73 | |
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74 | conf_undelim(sc, 0, ",=+-"); |
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75 | token(sc); |
76 | if (sc->t == '=') |
77 | token(sc); |
78 | |
79 | if (sc->t != CTOK_WORD) |
80 | error(sc, "parse error, expected file mode"); |
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81 | conf_undelim(sc, 0, 0); |
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82 | |
83 | /* --- If it looks digitlike, read as octal --- */ |
84 | |
85 | if (isdigit((unsigned char)*sc->d.buf)) |
86 | mode = strtoul(sc->d.buf, 0, 8) & 07777; |
87 | |
88 | /* --- Otherise read as chmod-like characters --- */ |
89 | |
90 | else { |
91 | const char *p; |
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92 | unsigned mask = 04700; |
93 | unsigned state = 0; |
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94 | unsigned or = 1; |
95 | |
96 | /* --- Set the default from the umask --- */ |
97 | |
98 | { |
99 | unsigned um = umask(0); |
100 | umask(um); |
101 | mode = 0666 & ~um; |
102 | } |
103 | |
104 | /* --- Parse the characters --- * |
105 | * |
106 | * This is a particularly lenient implementation of the usual chmod- |
107 | * style mode language. |
108 | */ |
109 | |
110 | for (p = sc->d.buf; *p; p++) { |
111 | switch (*p) { |
112 | case ',': break; |
113 | |
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114 | case 'a': mask = (mask & state) | 07777; state = 07777; break; |
115 | case 'u': mask = (mask & state) | 04700; state = 07777; break; |
116 | case 'g': mask = (mask & state) | 02070; state = 07777; break; |
117 | case 'o': mask = (mask & state) | 01007; state = 07777; break; |
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118 | |
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119 | case '=': mode &= ~mask; /* Drop through */ |
120 | case '+': state = 0; or = 1; break; |
121 | case '-': state = 0; or = 0; break; |
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122 | |
123 | #define APPLY(m) if (or) mode |= ((m) & mask); else mode &= ~((m) & mask); |
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124 | case 'r': state = 0; APPLY(00444); break; |
125 | case 'w': state = 0; APPLY(00222); break; |
126 | case 'x': state = 0; APPLY(00111); break; |
127 | case 's': state = 0; APPLY(06000); break; |
128 | case 't': state = 0; APPLY(01000); break; |
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129 | #undef APPLY |
130 | |
131 | default: error(sc, "unknown mode character `%c'", *p); |
132 | } |
133 | } |
134 | } |
135 | |
136 | token(sc); |
137 | f->mode = mode; |
138 | CONF_ACCEPT; |
139 | } |
140 | |
141 | /* --- Read a file uid specification --- */ |
142 | |
143 | if (strcmp(sc->d.buf, "uid") == 0 || |
144 | strcmp(sc->d.buf, "user") == 0 || |
145 | strcmp(sc->d.buf, "owner") == 0) { |
146 | token(sc); |
147 | if (sc->t == '=') |
148 | token(sc); |
149 | if (sc->t != CTOK_WORD) |
150 | error(sc, "parse error, expected user name or uid"); |
151 | if (isdigit((unsigned char)*sc->d.buf)) |
152 | f->uid = atoi(sc->d.buf); |
153 | else { |
154 | struct passwd *pw = getpwnam(sc->d.buf); |
155 | if (!pw) |
156 | error(sc, "unknown user name `%s'", sc->d.buf); |
157 | f->uid = pw->pw_uid; |
158 | } |
159 | token(sc); |
160 | CONF_ACCEPT; |
161 | } |
162 | |
163 | /* --- Read a file gid specification --- */ |
164 | |
165 | if (strcmp(sc->d.buf, "gid") == 0 || |
166 | strcmp(sc->d.buf, "group") == 0) { |
167 | token(sc); |
168 | if (sc->t == '=') |
169 | token(sc); |
170 | if (sc->t != CTOK_WORD) |
171 | error(sc, "parse error, expected group name or gid"); |
172 | if (isdigit((unsigned char)*sc->d.buf)) |
173 | f->gid = atoi(sc->d.buf); |
174 | else { |
175 | struct group *gr = getgrnam(sc->d.buf); |
176 | if (!gr) |
177 | error(sc, "unknown user name `%s'", sc->d.buf); |
178 | f->gid = gr->gr_gid; |
179 | } |
180 | token(sc); |
181 | CONF_ACCEPT; |
182 | } |
183 | |
184 | /* --- Nothing here for me --- */ |
185 | |
186 | CONF_END; |
187 | } |
188 | |
189 | /* --- @fattr_apply@ --- * |
190 | * |
191 | * Arguments: @const char *file@ = pointer to filename |
192 | * @fattr *f@ = pointer to attribute set |
193 | * |
194 | * Returns: @-1@ if it failed. |
195 | * |
196 | * Use: Applies file attributes to a file. For best results, try to |
197 | * create the file with the right permissions and so on. This |
198 | * call will fix everything up, but there are potential races |
199 | * which might catch you out if you're not careful. |
200 | */ |
201 | |
202 | int fattr_apply(const char *file, fattr *f) |
203 | { |
204 | if (chown(file, f->uid, f->gid) == -1 || |
205 | chmod(file, f->mode) == -1) |
206 | return (-1); |
207 | return (0); |
208 | } |
209 | |
210 | /*----- That's all, folks -------------------------------------------------*/ |