3b7defab |
1 | /* -*-c-*- |
2 | * |
9b699b28 |
3 | * $Id: fattr.c,v 1.3 2002/01/13 14:50:22 mdw Exp $ |
3b7defab |
4 | * |
5 | * Handling of file attributes |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the `fw' port forwarder. |
13 | * |
14 | * `fw' is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * `fw' 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 General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with `fw'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: fattr.c,v $ |
9b699b28 |
32 | * Revision 1.3 2002/01/13 14:50:22 mdw |
33 | * Delimiter-setting function names change. |
34 | * |
e73034b0 |
35 | * Revision 1.2 1999/08/19 18:32:48 mdw |
36 | * Improve lexical analysis. In particular, `chmod' patterns don't have to |
37 | * be quoted any more. |
38 | * |
3b7defab |
39 | * Revision 1.1 1999/07/26 23:33:56 mdw |
40 | * Support code for new design. |
41 | * |
42 | */ |
43 | |
44 | /*----- Header files ------------------------------------------------------*/ |
45 | |
46 | #include "config.h" |
47 | |
48 | #include <ctype.h> |
49 | #include <errno.h> |
50 | #include <stdio.h> |
51 | #include <stdlib.h> |
52 | #include <string.h> |
53 | |
54 | #include <sys/types.h> |
55 | #include <sys/stat.h> |
56 | #include <unistd.h> |
57 | |
58 | #include <pwd.h> |
59 | #include <grp.h> |
60 | |
61 | #include "conf.h" |
62 | #include "fattr.h" |
63 | #include "scan.h" |
64 | |
65 | /*----- Global variables --------------------------------------------------*/ |
66 | |
67 | fattr fattr_global; |
68 | |
69 | /*----- Main code ---------------------------------------------------------*/ |
70 | |
71 | /* --- @fattr_init@ --- * |
72 | * |
73 | * Arguments: @fattr *f@ = pointer to file attributes |
74 | * |
75 | * Returns: --- |
76 | * |
77 | * Use: Initializes a set of file attributes to default values. |
78 | */ |
79 | |
80 | void fattr_init(fattr *f) |
81 | { |
82 | unsigned um = umask(0); |
83 | umask(um); |
84 | f->mode = 0666 & ~um; |
85 | f->uid = -1; |
86 | f->gid = -1; |
87 | } |
88 | |
89 | /* --- @fattr_option@ --- * |
90 | * |
91 | * Arguments: @scanner *sc@ = pointer to scanner to read |
92 | * @fattr *f@ = pointer to file attributes to set |
93 | * |
94 | * Returns: Whether the option was claimed. |
95 | * |
96 | * Use: Reads file attributes from a scanner. |
97 | */ |
98 | |
99 | int fattr_option(scanner *sc, fattr *f) |
100 | { |
101 | CONF_BEGIN(sc, "fattr", "file attribute") |
102 | |
103 | /* --- Read a file mode specification --- */ |
104 | |
105 | if (strcmp(sc->d.buf, "mode") == 0) { |
106 | unsigned mode = 0; |
107 | |
108 | /* --- Gobble an optional `=' sign --- */ |
109 | |
9b699b28 |
110 | conf_undelim(sc, 0, ",=+-"); |
3b7defab |
111 | token(sc); |
112 | if (sc->t == '=') |
113 | token(sc); |
114 | |
115 | if (sc->t != CTOK_WORD) |
116 | error(sc, "parse error, expected file mode"); |
9b699b28 |
117 | conf_undelim(sc, 0, 0); |
3b7defab |
118 | |
119 | /* --- If it looks digitlike, read as octal --- */ |
120 | |
121 | if (isdigit((unsigned char)*sc->d.buf)) |
122 | mode = strtoul(sc->d.buf, 0, 8) & 07777; |
123 | |
124 | /* --- Otherise read as chmod-like characters --- */ |
125 | |
126 | else { |
127 | const char *p; |
e73034b0 |
128 | unsigned mask = 04700; |
129 | unsigned state = 0; |
3b7defab |
130 | unsigned or = 1; |
131 | |
132 | /* --- Set the default from the umask --- */ |
133 | |
134 | { |
135 | unsigned um = umask(0); |
136 | umask(um); |
137 | mode = 0666 & ~um; |
138 | } |
139 | |
140 | /* --- Parse the characters --- * |
141 | * |
142 | * This is a particularly lenient implementation of the usual chmod- |
143 | * style mode language. |
144 | */ |
145 | |
146 | for (p = sc->d.buf; *p; p++) { |
147 | switch (*p) { |
148 | case ',': break; |
149 | |
e73034b0 |
150 | case 'a': mask = (mask & state) | 07777; state = 07777; break; |
151 | case 'u': mask = (mask & state) | 04700; state = 07777; break; |
152 | case 'g': mask = (mask & state) | 02070; state = 07777; break; |
153 | case 'o': mask = (mask & state) | 01007; state = 07777; break; |
3b7defab |
154 | |
e73034b0 |
155 | case '=': mode &= ~mask; /* Drop through */ |
156 | case '+': state = 0; or = 1; break; |
157 | case '-': state = 0; or = 0; break; |
3b7defab |
158 | |
159 | #define APPLY(m) if (or) mode |= ((m) & mask); else mode &= ~((m) & mask); |
e73034b0 |
160 | case 'r': state = 0; APPLY(00444); break; |
161 | case 'w': state = 0; APPLY(00222); break; |
162 | case 'x': state = 0; APPLY(00111); break; |
163 | case 's': state = 0; APPLY(06000); break; |
164 | case 't': state = 0; APPLY(01000); break; |
3b7defab |
165 | #undef APPLY |
166 | |
167 | default: error(sc, "unknown mode character `%c'", *p); |
168 | } |
169 | } |
170 | } |
171 | |
172 | token(sc); |
173 | f->mode = mode; |
174 | CONF_ACCEPT; |
175 | } |
176 | |
177 | /* --- Read a file uid specification --- */ |
178 | |
179 | if (strcmp(sc->d.buf, "uid") == 0 || |
180 | strcmp(sc->d.buf, "user") == 0 || |
181 | strcmp(sc->d.buf, "owner") == 0) { |
182 | token(sc); |
183 | if (sc->t == '=') |
184 | token(sc); |
185 | if (sc->t != CTOK_WORD) |
186 | error(sc, "parse error, expected user name or uid"); |
187 | if (isdigit((unsigned char)*sc->d.buf)) |
188 | f->uid = atoi(sc->d.buf); |
189 | else { |
190 | struct passwd *pw = getpwnam(sc->d.buf); |
191 | if (!pw) |
192 | error(sc, "unknown user name `%s'", sc->d.buf); |
193 | f->uid = pw->pw_uid; |
194 | } |
195 | token(sc); |
196 | CONF_ACCEPT; |
197 | } |
198 | |
199 | /* --- Read a file gid specification --- */ |
200 | |
201 | if (strcmp(sc->d.buf, "gid") == 0 || |
202 | strcmp(sc->d.buf, "group") == 0) { |
203 | token(sc); |
204 | if (sc->t == '=') |
205 | token(sc); |
206 | if (sc->t != CTOK_WORD) |
207 | error(sc, "parse error, expected group name or gid"); |
208 | if (isdigit((unsigned char)*sc->d.buf)) |
209 | f->gid = atoi(sc->d.buf); |
210 | else { |
211 | struct group *gr = getgrnam(sc->d.buf); |
212 | if (!gr) |
213 | error(sc, "unknown user name `%s'", sc->d.buf); |
214 | f->gid = gr->gr_gid; |
215 | } |
216 | token(sc); |
217 | CONF_ACCEPT; |
218 | } |
219 | |
220 | /* --- Nothing here for me --- */ |
221 | |
222 | CONF_END; |
223 | } |
224 | |
225 | /* --- @fattr_apply@ --- * |
226 | * |
227 | * Arguments: @const char *file@ = pointer to filename |
228 | * @fattr *f@ = pointer to attribute set |
229 | * |
230 | * Returns: @-1@ if it failed. |
231 | * |
232 | * Use: Applies file attributes to a file. For best results, try to |
233 | * create the file with the right permissions and so on. This |
234 | * call will fix everything up, but there are potential races |
235 | * which might catch you out if you're not careful. |
236 | */ |
237 | |
238 | int fattr_apply(const char *file, fattr *f) |
239 | { |
240 | if (chown(file, f->uid, f->gid) == -1 || |
241 | chmod(file, f->mode) == -1) |
242 | return (-1); |
243 | return (0); |
244 | } |
245 | |
246 | /*----- That's all, folks -------------------------------------------------*/ |