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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
151b190e | 2 | |
151b190e | 3 | #include <errno.h> |
fabe5c0e | 4 | #include <getopt.h> |
3f6fd1ba LP |
5 | #include <limits.h> |
6 | #include <stdbool.h> | |
7 | #include <stdio.h> | |
8 | #include <stdlib.h> | |
ca78ad1d ZJS |
9 | #include <sys/stat.h> |
10 | #include <sys/types.h> | |
151b190e | 11 | |
b5efdb8a | 12 | #include "alloc-util.h" |
3f6fd1ba | 13 | #include "conf-files.h" |
a0f29c76 | 14 | #include "def.h" |
3ffd4af2 | 15 | #include "fd-util.h" |
3f6fd1ba | 16 | #include "fileio.h" |
151b190e | 17 | #include "log.h" |
3be1cabe | 18 | #include "main-func.h" |
dcd5c891 | 19 | #include "pager.h" |
7452c3ff | 20 | #include "path-util.h" |
294bf0c3 | 21 | #include "pretty-print.h" |
07630cea | 22 | #include "string-util.h" |
db1413d7 | 23 | #include "strv.h" |
151b190e | 24 | |
6aaab70f | 25 | static bool arg_cat_config = false; |
0221d68a | 26 | static PagerFlags arg_pager_flags = 0; |
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 | 31 | |
7452c3ff | 32 | assert(rule); |
151b190e LP |
33 | assert(rule[0]); |
34 | ||
f3670df1 LP |
35 | e = strchrnul(rule + 1, rule[0]); |
36 | x = strndup(rule + 1, e - rule - 1); | |
fabe5c0e | 37 | if (!x) |
14212119 | 38 | return log_oom(); |
151b190e | 39 | |
f3670df1 LP |
40 | if (!filename_is_valid(x) || |
41 | STR_IN_SET(x, "register", "status")) | |
baaa35ad | 42 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
f3670df1 | 43 | "Rule file name '%s' is not valid, refusing.", x); |
7452c3ff | 44 | |
f3670df1 | 45 | fn = path_join("/proc/sys/fs/binfmt_misc", x); |
151b190e | 46 | if (!fn) |
14212119 | 47 | return log_oom(); |
151b190e | 48 | |
57512c89 | 49 | return write_string_file(fn, "-1", WRITE_STRING_FILE_DISABLE_BUFFER); |
151b190e LP |
50 | } |
51 | ||
52 | static int apply_rule(const char *rule) { | |
53 | int r; | |
54 | ||
7452c3ff | 55 | (void) delete_rule(rule); |
151b190e | 56 | |
57512c89 | 57 | r = write_string_file("/proc/sys/fs/binfmt_misc/register", rule, WRITE_STRING_FILE_DISABLE_BUFFER); |
23bbb0de MS |
58 | if (r < 0) |
59 | return log_error_errno(r, "Failed to add binary format: %m"); | |
151b190e LP |
60 | |
61 | return 0; | |
62 | } | |
63 | ||
64 | static int apply_file(const char *path, bool ignore_enoent) { | |
fabe5c0e LP |
65 | _cleanup_fclose_ FILE *f = NULL; |
66 | int r; | |
151b190e LP |
67 | |
68 | assert(path); | |
69 | ||
a826d4f7 | 70 | r = search_and_fopen(path, "re", NULL, (const char**) CONF_PATHS_STRV("binfmt.d"), &f); |
fabe5c0e LP |
71 | if (r < 0) { |
72 | if (ignore_enoent && r == -ENOENT) | |
151b190e LP |
73 | return 0; |
74 | ||
741d2cb5 | 75 | return log_error_errno(r, "Failed to open file '%s': %m", path); |
151b190e LP |
76 | } |
77 | ||
9f6445e3 | 78 | log_debug("apply: %s", path); |
fabe5c0e | 79 | for (;;) { |
741d2cb5 LP |
80 | _cleanup_free_ char *line = NULL; |
81 | char *p; | |
151b190e LP |
82 | int k; |
83 | ||
741d2cb5 LP |
84 | k = read_line(f, LONG_LINE_MAX, &line); |
85 | if (k < 0) | |
86 | return log_error_errno(k, "Failed to read file '%s': %m", path); | |
87 | if (k == 0) | |
88 | break; | |
151b190e | 89 | |
741d2cb5 LP |
90 | p = strstrip(line); |
91 | if (isempty(p)) | |
151b190e | 92 | continue; |
741d2cb5 | 93 | if (strchr(COMMENTS, p[0])) |
151b190e LP |
94 | continue; |
95 | ||
fabe5c0e LP |
96 | k = apply_rule(p); |
97 | if (k < 0 && r == 0) | |
151b190e LP |
98 | r = k; |
99 | } | |
100 | ||
151b190e LP |
101 | return r; |
102 | } | |
103 | ||
37ec0fdd LP |
104 | static int help(void) { |
105 | _cleanup_free_ char *link = NULL; | |
106 | int r; | |
107 | ||
108 | r = terminal_urlify_man("systemd-binfmt.service", "8", &link); | |
109 | if (r < 0) | |
110 | return log_oom(); | |
111 | ||
fabe5c0e | 112 | printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" |
37ec0fdd | 113 | "Registers binary formats with the kernel.\n\n" |
eb9da376 | 114 | " -h --help Show this help\n" |
601185b4 | 115 | " --version Show package version\n" |
6aaab70f | 116 | " --cat-config Show configuration files\n" |
dcd5c891 | 117 | " --no-pager Do not pipe output into a pager\n" |
37ec0fdd LP |
118 | "\nSee the %s for details.\n" |
119 | , program_invocation_short_name | |
120 | , link | |
121 | ); | |
122 | ||
123 | return 0; | |
fabe5c0e LP |
124 | } |
125 | ||
126 | static int parse_argv(int argc, char *argv[]) { | |
eb9da376 LP |
127 | enum { |
128 | ARG_VERSION = 0x100, | |
6aaab70f | 129 | ARG_CAT_CONFIG, |
dcd5c891 | 130 | ARG_NO_PAGER, |
eb9da376 LP |
131 | }; |
132 | ||
fabe5c0e | 133 | static const struct option options[] = { |
dcd5c891 LP |
134 | { "help", no_argument, NULL, 'h' }, |
135 | { "version", no_argument, NULL, ARG_VERSION }, | |
136 | { "cat-config", no_argument, NULL, ARG_CAT_CONFIG }, | |
137 | { "no-pager", no_argument, NULL, ARG_NO_PAGER }, | |
eb9da376 | 138 | {} |
fabe5c0e LP |
139 | }; |
140 | ||
141 | int c; | |
142 | ||
143 | assert(argc >= 0); | |
144 | assert(argv); | |
145 | ||
601185b4 | 146 | while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) |
fabe5c0e LP |
147 | |
148 | switch (c) { | |
149 | ||
150 | case 'h': | |
37ec0fdd | 151 | return help(); |
eb9da376 LP |
152 | |
153 | case ARG_VERSION: | |
3f6fd1ba | 154 | return version(); |
fabe5c0e | 155 | |
6aaab70f ZJS |
156 | case ARG_CAT_CONFIG: |
157 | arg_cat_config = true; | |
158 | break; | |
159 | ||
dcd5c891 | 160 | case ARG_NO_PAGER: |
0221d68a | 161 | arg_pager_flags |= PAGER_DISABLE; |
dcd5c891 LP |
162 | break; |
163 | ||
fabe5c0e LP |
164 | case '?': |
165 | return -EINVAL; | |
166 | ||
167 | default: | |
eb9da376 | 168 | assert_not_reached("Unhandled option"); |
fabe5c0e | 169 | } |
fabe5c0e | 170 | |
baaa35ad ZJS |
171 | if (arg_cat_config && argc > optind) |
172 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
173 | "Positional arguments are not allowed with --cat-config"); | |
6aaab70f | 174 | |
fabe5c0e LP |
175 | return 1; |
176 | } | |
177 | ||
3be1cabe | 178 | static int run(int argc, char *argv[]) { |
fabe5c0e LP |
179 | int r, k; |
180 | ||
181 | r = parse_argv(argc, argv); | |
182 | if (r <= 0) | |
183 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
151b190e | 184 | |
6bf3c61c | 185 | log_setup_service(); |
151b190e | 186 | |
4c12626c LP |
187 | umask(0022); |
188 | ||
fabe5c0e | 189 | r = 0; |
13317670 | 190 | |
fabe5c0e LP |
191 | if (argc > optind) { |
192 | int i; | |
13317670 | 193 | |
fabe5c0e | 194 | for (i = optind; i < argc; i++) { |
170dcb7b | 195 | k = apply_file(argv[i], false); |
13317670 LP |
196 | if (k < 0 && r == 0) |
197 | r = k; | |
198 | } | |
db1413d7 | 199 | } else { |
fabe5c0e LP |
200 | _cleanup_strv_free_ char **files = NULL; |
201 | char **f; | |
db1413d7 | 202 | |
a826d4f7 | 203 | r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char**) CONF_PATHS_STRV("binfmt.d")); |
3be1cabe ZJS |
204 | if (r < 0) |
205 | return log_error_errno(r, "Failed to enumerate binfmt.d files: %m"); | |
151b190e | 206 | |
6aaab70f | 207 | if (arg_cat_config) { |
0221d68a | 208 | (void) pager_open(arg_pager_flags); |
dcd5c891 | 209 | |
3be1cabe | 210 | return cat_files(NULL, files, 0); |
6aaab70f ZJS |
211 | } |
212 | ||
13317670 | 213 | /* Flush out all rules */ |
22e596d6 | 214 | (void) write_string_file("/proc/sys/fs/binfmt_misc/status", "-1", WRITE_STRING_FILE_DISABLE_BUFFER); |
13317670 | 215 | |
db1413d7 | 216 | STRV_FOREACH(f, files) { |
db1413d7 KS |
217 | k = apply_file(*f, true); |
218 | if (k < 0 && r == 0) | |
219 | r = k; | |
220 | } | |
db1413d7 | 221 | } |
fabe5c0e | 222 | |
3be1cabe | 223 | return r; |
151b190e | 224 | } |
3be1cabe ZJS |
225 | |
226 | DEFINE_MAIN_FUNCTION(run); |