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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 | |
7f0a55d4 | 39 | static const char conf_file_dirs[] = CONF_DIRS_NULSTR("binfmt"); |
fabe5c0e | 40 | |
151b190e | 41 | static int delete_rule(const char *rule) { |
fabe5c0e LP |
42 | _cleanup_free_ char *x = NULL, *fn = NULL; |
43 | char *e; | |
151b190e LP |
44 | |
45 | assert(rule[0]); | |
46 | ||
fabe5c0e LP |
47 | x = strdup(rule); |
48 | if (!x) | |
14212119 | 49 | return log_oom(); |
151b190e LP |
50 | |
51 | e = strchrnul(x+1, x[0]); | |
52 | *e = 0; | |
53 | ||
fabe5c0e | 54 | fn = strappend("/proc/sys/fs/binfmt_misc/", x+1); |
151b190e | 55 | if (!fn) |
14212119 | 56 | return log_oom(); |
151b190e | 57 | |
574d5f2d | 58 | return write_string_file(fn, "-1"); |
151b190e LP |
59 | } |
60 | ||
61 | static int apply_rule(const char *rule) { | |
62 | int r; | |
63 | ||
64 | delete_rule(rule); | |
65 | ||
574d5f2d | 66 | r = write_string_file("/proc/sys/fs/binfmt_misc/register", rule); |
fabe5c0e | 67 | if (r < 0) { |
151b190e LP |
68 | log_error("Failed to add binary format: %s", strerror(-r)); |
69 | return r; | |
70 | } | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static int apply_file(const char *path, bool ignore_enoent) { | |
fabe5c0e LP |
76 | _cleanup_fclose_ FILE *f = NULL; |
77 | int r; | |
151b190e LP |
78 | |
79 | assert(path); | |
80 | ||
4cf7ea55 | 81 | r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f); |
fabe5c0e LP |
82 | if (r < 0) { |
83 | if (ignore_enoent && r == -ENOENT) | |
151b190e LP |
84 | return 0; |
85 | ||
fabe5c0e LP |
86 | log_error("Failed to open file '%s', ignoring: %s", path, strerror(-r)); |
87 | return r; | |
151b190e LP |
88 | } |
89 | ||
9f6445e3 | 90 | log_debug("apply: %s", path); |
fabe5c0e | 91 | for (;;) { |
151b190e LP |
92 | char l[LINE_MAX], *p; |
93 | int k; | |
94 | ||
95 | if (!fgets(l, sizeof(l), f)) { | |
96 | if (feof(f)) | |
97 | break; | |
98 | ||
99 | log_error("Failed to read file '%s', ignoring: %m", path); | |
fabe5c0e | 100 | return -errno; |
151b190e LP |
101 | } |
102 | ||
103 | p = strstrip(l); | |
151b190e LP |
104 | if (!*p) |
105 | continue; | |
d3b6d0c2 | 106 | if (strchr(COMMENTS "\n", *p)) |
151b190e LP |
107 | continue; |
108 | ||
fabe5c0e LP |
109 | k = apply_rule(p); |
110 | if (k < 0 && r == 0) | |
151b190e LP |
111 | r = k; |
112 | } | |
113 | ||
151b190e LP |
114 | return r; |
115 | } | |
116 | ||
601185b4 | 117 | static void help(void) { |
fabe5c0e LP |
118 | printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" |
119 | "Registers binary formats.\n\n" | |
eb9da376 | 120 | " -h --help Show this help\n" |
601185b4 ZJS |
121 | " --version Show package version\n" |
122 | , program_invocation_short_name); | |
fabe5c0e LP |
123 | } |
124 | ||
125 | static int parse_argv(int argc, char *argv[]) { | |
126 | ||
eb9da376 LP |
127 | enum { |
128 | ARG_VERSION = 0x100, | |
129 | }; | |
130 | ||
fabe5c0e LP |
131 | static const struct option options[] = { |
132 | { "help", no_argument, NULL, 'h' }, | |
eb9da376 LP |
133 | { "version", no_argument, NULL, ARG_VERSION }, |
134 | {} | |
fabe5c0e LP |
135 | }; |
136 | ||
137 | int c; | |
138 | ||
139 | assert(argc >= 0); | |
140 | assert(argv); | |
141 | ||
601185b4 | 142 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) |
fabe5c0e LP |
143 | |
144 | switch (c) { | |
145 | ||
146 | case 'h': | |
601185b4 ZJS |
147 | help(); |
148 | return 0; | |
eb9da376 LP |
149 | |
150 | case ARG_VERSION: | |
151 | puts(PACKAGE_STRING); | |
152 | puts(SYSTEMD_FEATURES); | |
fabe5c0e LP |
153 | return 0; |
154 | ||
155 | case '?': | |
156 | return -EINVAL; | |
157 | ||
158 | default: | |
eb9da376 | 159 | assert_not_reached("Unhandled option"); |
fabe5c0e | 160 | } |
fabe5c0e LP |
161 | |
162 | return 1; | |
163 | } | |
164 | ||
151b190e | 165 | int main(int argc, char *argv[]) { |
fabe5c0e LP |
166 | int r, k; |
167 | ||
168 | r = parse_argv(argc, argv); | |
169 | if (r <= 0) | |
170 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
151b190e | 171 | |
151b190e LP |
172 | log_set_target(LOG_TARGET_AUTO); |
173 | log_parse_environment(); | |
174 | log_open(); | |
175 | ||
4c12626c LP |
176 | umask(0022); |
177 | ||
fabe5c0e | 178 | r = 0; |
13317670 | 179 | |
fabe5c0e LP |
180 | if (argc > optind) { |
181 | int i; | |
13317670 | 182 | |
fabe5c0e | 183 | for (i = optind; i < argc; i++) { |
170dcb7b | 184 | k = apply_file(argv[i], false); |
13317670 LP |
185 | if (k < 0 && r == 0) |
186 | r = k; | |
187 | } | |
db1413d7 | 188 | } else { |
fabe5c0e LP |
189 | _cleanup_strv_free_ char **files = NULL; |
190 | char **f; | |
db1413d7 | 191 | |
fabe5c0e | 192 | r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs); |
44143309 KS |
193 | if (r < 0) { |
194 | log_error("Failed to enumerate binfmt.d files: %s", strerror(-r)); | |
195 | goto finish; | |
196 | } | |
151b190e | 197 | |
13317670 | 198 | /* Flush out all rules */ |
574d5f2d | 199 | write_string_file("/proc/sys/fs/binfmt_misc/status", "-1"); |
13317670 | 200 | |
db1413d7 | 201 | STRV_FOREACH(f, files) { |
db1413d7 KS |
202 | k = apply_file(*f, true); |
203 | if (k < 0 && r == 0) | |
204 | r = k; | |
205 | } | |
db1413d7 | 206 | } |
fabe5c0e | 207 | |
44143309 | 208 | finish: |
151b190e LP |
209 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
210 | } |