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151b190e LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
151b190e LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
151b190e | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
151b190e LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <stdbool.h> | |
24 | #include <errno.h> | |
25 | #include <string.h> | |
26 | #include <stdio.h> | |
27 | #include <limits.h> | |
db1413d7 | 28 | #include <stdarg.h> |
fabe5c0e | 29 | #include <getopt.h> |
151b190e LP |
30 | |
31 | #include "log.h" | |
db1413d7 KS |
32 | #include "hashmap.h" |
33 | #include "strv.h" | |
151b190e | 34 | #include "util.h" |
2c21044f | 35 | #include "conf-files.h" |
a5c32cff | 36 | #include "fileio.h" |
eb9da376 | 37 | #include "build.h" |
151b190e | 38 | |
fabe5c0e LP |
39 | static const char conf_file_dirs[] = |
40 | "/etc/binfmt.d\0" | |
41 | "/run/binfmt.d\0" | |
42 | "/usr/local/lib/binfmt.d\0" | |
43 | "/usr/lib/binfmt.d\0" | |
44 | #ifdef HAVE_SPLIT_USR | |
45 | "/lib/binfmt.d\0" | |
46 | #endif | |
47 | ; | |
48 | ||
151b190e | 49 | static int delete_rule(const char *rule) { |
fabe5c0e LP |
50 | _cleanup_free_ char *x = NULL, *fn = NULL; |
51 | char *e; | |
151b190e LP |
52 | |
53 | assert(rule[0]); | |
54 | ||
fabe5c0e LP |
55 | x = strdup(rule); |
56 | if (!x) | |
14212119 | 57 | return log_oom(); |
151b190e LP |
58 | |
59 | e = strchrnul(x+1, x[0]); | |
60 | *e = 0; | |
61 | ||
fabe5c0e | 62 | fn = strappend("/proc/sys/fs/binfmt_misc/", x+1); |
151b190e | 63 | if (!fn) |
14212119 | 64 | return log_oom(); |
151b190e | 65 | |
574d5f2d | 66 | return write_string_file(fn, "-1"); |
151b190e LP |
67 | } |
68 | ||
69 | static int apply_rule(const char *rule) { | |
70 | int r; | |
71 | ||
72 | delete_rule(rule); | |
73 | ||
574d5f2d | 74 | r = write_string_file("/proc/sys/fs/binfmt_misc/register", rule); |
fabe5c0e | 75 | if (r < 0) { |
151b190e LP |
76 | log_error("Failed to add binary format: %s", strerror(-r)); |
77 | return r; | |
78 | } | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static int apply_file(const char *path, bool ignore_enoent) { | |
fabe5c0e LP |
84 | _cleanup_fclose_ FILE *f = NULL; |
85 | int r; | |
151b190e LP |
86 | |
87 | assert(path); | |
88 | ||
4cf7ea55 | 89 | r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f); |
fabe5c0e LP |
90 | if (r < 0) { |
91 | if (ignore_enoent && r == -ENOENT) | |
151b190e LP |
92 | return 0; |
93 | ||
fabe5c0e LP |
94 | log_error("Failed to open file '%s', ignoring: %s", path, strerror(-r)); |
95 | return r; | |
151b190e LP |
96 | } |
97 | ||
9f6445e3 | 98 | log_debug("apply: %s", path); |
fabe5c0e | 99 | for (;;) { |
151b190e LP |
100 | char l[LINE_MAX], *p; |
101 | int k; | |
102 | ||
103 | if (!fgets(l, sizeof(l), f)) { | |
104 | if (feof(f)) | |
105 | break; | |
106 | ||
107 | log_error("Failed to read file '%s', ignoring: %m", path); | |
fabe5c0e | 108 | return -errno; |
151b190e LP |
109 | } |
110 | ||
111 | p = strstrip(l); | |
151b190e LP |
112 | if (!*p) |
113 | continue; | |
d3b6d0c2 | 114 | if (strchr(COMMENTS "\n", *p)) |
151b190e LP |
115 | continue; |
116 | ||
fabe5c0e LP |
117 | k = apply_rule(p); |
118 | if (k < 0 && r == 0) | |
151b190e LP |
119 | r = k; |
120 | } | |
121 | ||
151b190e LP |
122 | return r; |
123 | } | |
124 | ||
601185b4 | 125 | static void help(void) { |
fabe5c0e LP |
126 | printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" |
127 | "Registers binary formats.\n\n" | |
eb9da376 | 128 | " -h --help Show this help\n" |
601185b4 ZJS |
129 | " --version Show package version\n" |
130 | , program_invocation_short_name); | |
fabe5c0e LP |
131 | } |
132 | ||
133 | static int parse_argv(int argc, char *argv[]) { | |
134 | ||
eb9da376 LP |
135 | enum { |
136 | ARG_VERSION = 0x100, | |
137 | }; | |
138 | ||
fabe5c0e LP |
139 | static const struct option options[] = { |
140 | { "help", no_argument, NULL, 'h' }, | |
eb9da376 LP |
141 | { "version", no_argument, NULL, ARG_VERSION }, |
142 | {} | |
fabe5c0e LP |
143 | }; |
144 | ||
145 | int c; | |
146 | ||
147 | assert(argc >= 0); | |
148 | assert(argv); | |
149 | ||
601185b4 | 150 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) |
fabe5c0e LP |
151 | |
152 | switch (c) { | |
153 | ||
154 | case 'h': | |
601185b4 ZJS |
155 | help(); |
156 | return 0; | |
eb9da376 LP |
157 | |
158 | case ARG_VERSION: | |
159 | puts(PACKAGE_STRING); | |
160 | puts(SYSTEMD_FEATURES); | |
fabe5c0e LP |
161 | return 0; |
162 | ||
163 | case '?': | |
164 | return -EINVAL; | |
165 | ||
166 | default: | |
eb9da376 | 167 | assert_not_reached("Unhandled option"); |
fabe5c0e | 168 | } |
fabe5c0e LP |
169 | |
170 | return 1; | |
171 | } | |
172 | ||
151b190e | 173 | int main(int argc, char *argv[]) { |
fabe5c0e LP |
174 | int r, k; |
175 | ||
176 | r = parse_argv(argc, argv); | |
177 | if (r <= 0) | |
178 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
151b190e | 179 | |
151b190e LP |
180 | log_set_target(LOG_TARGET_AUTO); |
181 | log_parse_environment(); | |
182 | log_open(); | |
183 | ||
4c12626c LP |
184 | umask(0022); |
185 | ||
fabe5c0e | 186 | r = 0; |
13317670 | 187 | |
fabe5c0e LP |
188 | if (argc > optind) { |
189 | int i; | |
13317670 | 190 | |
fabe5c0e | 191 | for (i = optind; i < argc; i++) { |
170dcb7b | 192 | k = apply_file(argv[i], false); |
13317670 LP |
193 | if (k < 0 && r == 0) |
194 | r = k; | |
195 | } | |
db1413d7 | 196 | } else { |
fabe5c0e LP |
197 | _cleanup_strv_free_ char **files = NULL; |
198 | char **f; | |
db1413d7 | 199 | |
fabe5c0e | 200 | r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs); |
44143309 KS |
201 | if (r < 0) { |
202 | log_error("Failed to enumerate binfmt.d files: %s", strerror(-r)); | |
203 | goto finish; | |
204 | } | |
151b190e | 205 | |
13317670 | 206 | /* Flush out all rules */ |
574d5f2d | 207 | write_string_file("/proc/sys/fs/binfmt_misc/status", "-1"); |
13317670 | 208 | |
db1413d7 | 209 | STRV_FOREACH(f, files) { |
db1413d7 KS |
210 | k = apply_file(*f, true); |
211 | if (k < 0 && r == 0) | |
212 | r = k; | |
213 | } | |
db1413d7 | 214 | } |
fabe5c0e | 215 | |
44143309 | 216 | finish: |
151b190e LP |
217 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
218 | } |