3b7defab |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: fattr.c,v 1.1 1999/07/26 23:33:56 mdw Exp $ |
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 $ |
32 | * Revision 1.1 1999/07/26 23:33:56 mdw |
33 | * Support code for new design. |
34 | * |
35 | */ |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #include "config.h" |
40 | |
41 | #include <ctype.h> |
42 | #include <errno.h> |
43 | #include <stdio.h> |
44 | #include <stdlib.h> |
45 | #include <string.h> |
46 | |
47 | #include <sys/types.h> |
48 | #include <sys/stat.h> |
49 | #include <unistd.h> |
50 | |
51 | #include <pwd.h> |
52 | #include <grp.h> |
53 | |
54 | #include "conf.h" |
55 | #include "fattr.h" |
56 | #include "scan.h" |
57 | |
58 | /*----- Global variables --------------------------------------------------*/ |
59 | |
60 | fattr fattr_global; |
61 | |
62 | /*----- Main code ---------------------------------------------------------*/ |
63 | |
64 | /* --- @fattr_init@ --- * |
65 | * |
66 | * Arguments: @fattr *f@ = pointer to file attributes |
67 | * |
68 | * Returns: --- |
69 | * |
70 | * Use: Initializes a set of file attributes to default values. |
71 | */ |
72 | |
73 | void fattr_init(fattr *f) |
74 | { |
75 | unsigned um = umask(0); |
76 | umask(um); |
77 | f->mode = 0666 & ~um; |
78 | f->uid = -1; |
79 | f->gid = -1; |
80 | } |
81 | |
82 | /* --- @fattr_option@ --- * |
83 | * |
84 | * Arguments: @scanner *sc@ = pointer to scanner to read |
85 | * @fattr *f@ = pointer to file attributes to set |
86 | * |
87 | * Returns: Whether the option was claimed. |
88 | * |
89 | * Use: Reads file attributes from a scanner. |
90 | */ |
91 | |
92 | int fattr_option(scanner *sc, fattr *f) |
93 | { |
94 | CONF_BEGIN(sc, "fattr", "file attribute") |
95 | |
96 | /* --- Read a file mode specification --- */ |
97 | |
98 | if (strcmp(sc->d.buf, "mode") == 0) { |
99 | unsigned mode = 0; |
100 | |
101 | /* --- Gobble an optional `=' sign --- */ |
102 | |
103 | token(sc); |
104 | if (sc->t == '=') |
105 | token(sc); |
106 | |
107 | if (sc->t != CTOK_WORD) |
108 | error(sc, "parse error, expected file mode"); |
109 | |
110 | /* --- If it looks digitlike, read as octal --- */ |
111 | |
112 | if (isdigit((unsigned char)*sc->d.buf)) |
113 | mode = strtoul(sc->d.buf, 0, 8) & 07777; |
114 | |
115 | /* --- Otherise read as chmod-like characters --- */ |
116 | |
117 | else { |
118 | const char *p; |
119 | unsigned mask = 07777; |
120 | unsigned or = 1; |
121 | |
122 | /* --- Set the default from the umask --- */ |
123 | |
124 | { |
125 | unsigned um = umask(0); |
126 | umask(um); |
127 | mode = 0666 & ~um; |
128 | } |
129 | |
130 | /* --- Parse the characters --- * |
131 | * |
132 | * This is a particularly lenient implementation of the usual chmod- |
133 | * style mode language. |
134 | */ |
135 | |
136 | for (p = sc->d.buf; *p; p++) { |
137 | switch (*p) { |
138 | case ',': break; |
139 | |
140 | case 'a': mask = 07777; break; |
141 | case 'u': mask = 04700; break; |
142 | case 'g': mask = 02070; break; |
143 | case 'o': mask = 01007; break; |
144 | |
145 | case '=': mode &= ~mask; break; |
146 | case '-': or = 0; break; |
147 | case '+': or = 1; break; |
148 | |
149 | #define APPLY(m) if (or) mode |= ((m) & mask); else mode &= ~((m) & mask); |
150 | case 'r': APPLY(00444); break; |
151 | case 'w': APPLY(00222); break; |
152 | case 'x': APPLY(00111); break; |
153 | case 's': APPLY(06000); break; |
154 | case 't': APPLY(01000); break; |
155 | #undef APPLY |
156 | |
157 | default: error(sc, "unknown mode character `%c'", *p); |
158 | } |
159 | } |
160 | } |
161 | |
162 | token(sc); |
163 | f->mode = mode; |
164 | CONF_ACCEPT; |
165 | } |
166 | |
167 | /* --- Read a file uid specification --- */ |
168 | |
169 | if (strcmp(sc->d.buf, "uid") == 0 || |
170 | strcmp(sc->d.buf, "user") == 0 || |
171 | strcmp(sc->d.buf, "owner") == 0) { |
172 | token(sc); |
173 | if (sc->t == '=') |
174 | token(sc); |
175 | if (sc->t != CTOK_WORD) |
176 | error(sc, "parse error, expected user name or uid"); |
177 | if (isdigit((unsigned char)*sc->d.buf)) |
178 | f->uid = atoi(sc->d.buf); |
179 | else { |
180 | struct passwd *pw = getpwnam(sc->d.buf); |
181 | if (!pw) |
182 | error(sc, "unknown user name `%s'", sc->d.buf); |
183 | f->uid = pw->pw_uid; |
184 | } |
185 | token(sc); |
186 | CONF_ACCEPT; |
187 | } |
188 | |
189 | /* --- Read a file gid specification --- */ |
190 | |
191 | if (strcmp(sc->d.buf, "gid") == 0 || |
192 | strcmp(sc->d.buf, "group") == 0) { |
193 | token(sc); |
194 | if (sc->t == '=') |
195 | token(sc); |
196 | if (sc->t != CTOK_WORD) |
197 | error(sc, "parse error, expected group name or gid"); |
198 | if (isdigit((unsigned char)*sc->d.buf)) |
199 | f->gid = atoi(sc->d.buf); |
200 | else { |
201 | struct group *gr = getgrnam(sc->d.buf); |
202 | if (!gr) |
203 | error(sc, "unknown user name `%s'", sc->d.buf); |
204 | f->gid = gr->gr_gid; |
205 | } |
206 | token(sc); |
207 | CONF_ACCEPT; |
208 | } |
209 | |
210 | /* --- Nothing here for me --- */ |
211 | |
212 | CONF_END; |
213 | } |
214 | |
215 | /* --- @fattr_apply@ --- * |
216 | * |
217 | * Arguments: @const char *file@ = pointer to filename |
218 | * @fattr *f@ = pointer to attribute set |
219 | * |
220 | * Returns: @-1@ if it failed. |
221 | * |
222 | * Use: Applies file attributes to a file. For best results, try to |
223 | * create the file with the right permissions and so on. This |
224 | * call will fix everything up, but there are potential races |
225 | * which might catch you out if you're not careful. |
226 | */ |
227 | |
228 | int fattr_apply(const char *file, fattr *f) |
229 | { |
230 | if (chown(file, f->uid, f->gid) == -1 || |
231 | chmod(file, f->mode) == -1) |
232 | return (-1); |
233 | return (0); |
234 | } |
235 | |
236 | /*----- That's all, folks -------------------------------------------------*/ |