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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
151b190e LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
151b190e LP |
6 | ***/ |
7 | ||
151b190e | 8 | #include <errno.h> |
fabe5c0e | 9 | #include <getopt.h> |
3f6fd1ba LP |
10 | #include <limits.h> |
11 | #include <stdbool.h> | |
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <string.h> | |
151b190e | 15 | |
b5efdb8a | 16 | #include "alloc-util.h" |
3f6fd1ba | 17 | #include "conf-files.h" |
a0f29c76 | 18 | #include "def.h" |
3ffd4af2 | 19 | #include "fd-util.h" |
3f6fd1ba | 20 | #include "fileio.h" |
151b190e | 21 | #include "log.h" |
07630cea | 22 | #include "string-util.h" |
db1413d7 | 23 | #include "strv.h" |
151b190e LP |
24 | #include "util.h" |
25 | ||
75eb6154 | 26 | static const char conf_file_dirs[] = CONF_PATHS_NULSTR("binfmt.d"); |
fabe5c0e | 27 | |
151b190e | 28 | static int delete_rule(const char *rule) { |
fabe5c0e LP |
29 | _cleanup_free_ char *x = NULL, *fn = NULL; |
30 | char *e; | |
151b190e LP |
31 | |
32 | assert(rule[0]); | |
33 | ||
fabe5c0e LP |
34 | x = strdup(rule); |
35 | if (!x) | |
14212119 | 36 | return log_oom(); |
151b190e LP |
37 | |
38 | e = strchrnul(x+1, x[0]); | |
39 | *e = 0; | |
40 | ||
fabe5c0e | 41 | fn = strappend("/proc/sys/fs/binfmt_misc/", x+1); |
151b190e | 42 | if (!fn) |
14212119 | 43 | return log_oom(); |
151b190e | 44 | |
4c1fc3e4 | 45 | return write_string_file(fn, "-1", 0); |
151b190e LP |
46 | } |
47 | ||
48 | static int apply_rule(const char *rule) { | |
49 | int r; | |
50 | ||
51 | delete_rule(rule); | |
52 | ||
4c1fc3e4 | 53 | r = write_string_file("/proc/sys/fs/binfmt_misc/register", rule, 0); |
23bbb0de MS |
54 | if (r < 0) |
55 | return log_error_errno(r, "Failed to add binary format: %m"); | |
151b190e LP |
56 | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static int apply_file(const char *path, bool ignore_enoent) { | |
fabe5c0e LP |
61 | _cleanup_fclose_ FILE *f = NULL; |
62 | int r; | |
151b190e LP |
63 | |
64 | assert(path); | |
65 | ||
4cf7ea55 | 66 | r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f); |
fabe5c0e LP |
67 | if (r < 0) { |
68 | if (ignore_enoent && r == -ENOENT) | |
151b190e LP |
69 | return 0; |
70 | ||
23bbb0de | 71 | return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path); |
151b190e LP |
72 | } |
73 | ||
9f6445e3 | 74 | log_debug("apply: %s", path); |
fabe5c0e | 75 | for (;;) { |
151b190e LP |
76 | char l[LINE_MAX], *p; |
77 | int k; | |
78 | ||
79 | if (!fgets(l, sizeof(l), f)) { | |
80 | if (feof(f)) | |
81 | break; | |
82 | ||
e1427b13 | 83 | return log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path); |
151b190e LP |
84 | } |
85 | ||
86 | p = strstrip(l); | |
151b190e LP |
87 | if (!*p) |
88 | continue; | |
d3b6d0c2 | 89 | if (strchr(COMMENTS "\n", *p)) |
151b190e LP |
90 | continue; |
91 | ||
fabe5c0e LP |
92 | k = apply_rule(p); |
93 | if (k < 0 && r == 0) | |
151b190e LP |
94 | r = k; |
95 | } | |
96 | ||
151b190e LP |
97 | return r; |
98 | } | |
99 | ||
601185b4 | 100 | static void help(void) { |
fabe5c0e LP |
101 | printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" |
102 | "Registers binary formats.\n\n" | |
eb9da376 | 103 | " -h --help Show this help\n" |
601185b4 ZJS |
104 | " --version Show package version\n" |
105 | , program_invocation_short_name); | |
fabe5c0e LP |
106 | } |
107 | ||
108 | static int parse_argv(int argc, char *argv[]) { | |
109 | ||
eb9da376 LP |
110 | enum { |
111 | ARG_VERSION = 0x100, | |
112 | }; | |
113 | ||
fabe5c0e LP |
114 | static const struct option options[] = { |
115 | { "help", no_argument, NULL, 'h' }, | |
eb9da376 LP |
116 | { "version", no_argument, NULL, ARG_VERSION }, |
117 | {} | |
fabe5c0e LP |
118 | }; |
119 | ||
120 | int c; | |
121 | ||
122 | assert(argc >= 0); | |
123 | assert(argv); | |
124 | ||
601185b4 | 125 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) |
fabe5c0e LP |
126 | |
127 | switch (c) { | |
128 | ||
129 | case 'h': | |
601185b4 ZJS |
130 | help(); |
131 | return 0; | |
eb9da376 LP |
132 | |
133 | case ARG_VERSION: | |
3f6fd1ba | 134 | return version(); |
fabe5c0e LP |
135 | |
136 | case '?': | |
137 | return -EINVAL; | |
138 | ||
139 | default: | |
eb9da376 | 140 | assert_not_reached("Unhandled option"); |
fabe5c0e | 141 | } |
fabe5c0e LP |
142 | |
143 | return 1; | |
144 | } | |
145 | ||
151b190e | 146 | int main(int argc, char *argv[]) { |
fabe5c0e LP |
147 | int r, k; |
148 | ||
149 | r = parse_argv(argc, argv); | |
150 | if (r <= 0) | |
151 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
151b190e | 152 | |
151b190e LP |
153 | log_set_target(LOG_TARGET_AUTO); |
154 | log_parse_environment(); | |
155 | log_open(); | |
156 | ||
4c12626c LP |
157 | umask(0022); |
158 | ||
fabe5c0e | 159 | r = 0; |
13317670 | 160 | |
fabe5c0e LP |
161 | if (argc > optind) { |
162 | int i; | |
13317670 | 163 | |
fabe5c0e | 164 | for (i = optind; i < argc; i++) { |
170dcb7b | 165 | k = apply_file(argv[i], false); |
13317670 LP |
166 | if (k < 0 && r == 0) |
167 | r = k; | |
168 | } | |
db1413d7 | 169 | } else { |
fabe5c0e LP |
170 | _cleanup_strv_free_ char **files = NULL; |
171 | char **f; | |
db1413d7 | 172 | |
b5084605 | 173 | r = conf_files_list_nulstr(&files, ".conf", NULL, 0, conf_file_dirs); |
44143309 | 174 | if (r < 0) { |
da927ba9 | 175 | log_error_errno(r, "Failed to enumerate binfmt.d files: %m"); |
44143309 KS |
176 | goto finish; |
177 | } | |
151b190e | 178 | |
13317670 | 179 | /* Flush out all rules */ |
ad118bda | 180 | write_string_file("/proc/sys/fs/binfmt_misc/status", "-1", 0); |
13317670 | 181 | |
db1413d7 | 182 | STRV_FOREACH(f, files) { |
db1413d7 KS |
183 | k = apply_file(*f, true); |
184 | if (k < 0 && r == 0) | |
185 | r = k; | |
186 | } | |
db1413d7 | 187 | } |
fabe5c0e | 188 | |
44143309 | 189 | finish: |
151b190e LP |
190 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
191 | } |