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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
a16e1123 | 2 | |
cf0fbc49 | 3 | #include <errno.h> |
a16e1123 | 4 | #include <fcntl.h> |
11c3a366 | 5 | #include <stddef.h> |
a16e1123 | 6 | |
07630cea LP |
7 | #include "sd-daemon.h" |
8 | ||
ae2a15bc | 9 | #include "alloc-util.h" |
8fb3f009 | 10 | #include "dirent-util.h" |
3ffd4af2 LP |
11 | #include "fd-util.h" |
12 | #include "fdset.h" | |
93cc7779 | 13 | #include "log.h" |
3ffd4af2 | 14 | #include "macro.h" |
6bedfcbb | 15 | #include "parse-util.h" |
11c3a366 | 16 | #include "path-util.h" |
93cc7779 | 17 | #include "set.h" |
08a0ebc6 | 18 | #include "stat-util.h" |
a16e1123 LP |
19 | |
20 | #define MAKE_SET(s) ((Set*) s) | |
21 | #define MAKE_FDSET(s) ((FDSet*) s) | |
22 | ||
a16e1123 | 23 | FDSet *fdset_new(void) { |
d5099efc | 24 | return MAKE_FDSET(set_new(NULL)); |
a16e1123 LP |
25 | } |
26 | ||
cf1ab844 | 27 | static void fdset_shallow_freep(FDSet **s) { |
08a0ebc6 LP |
28 | /* Destroys the set, but does not free the fds inside, like fdset_free()! */ |
29 | set_free(MAKE_SET(*ASSERT_PTR(s))); | |
30 | } | |
31 | ||
32 | int fdset_new_array(FDSet **ret, const int fds[], size_t n_fds) { | |
33 | _cleanup_(fdset_shallow_freep) FDSet *s = NULL; | |
a354329f LP |
34 | int r; |
35 | ||
36 | assert(ret); | |
08a0ebc6 | 37 | assert(fds || n_fds == 0); |
a354329f LP |
38 | |
39 | s = fdset_new(); | |
40 | if (!s) | |
41 | return -ENOMEM; | |
42 | ||
1cbd441b MY |
43 | FOREACH_ARRAY(fd, fds, n_fds) { |
44 | r = fdset_put(s, *fd); | |
08a0ebc6 | 45 | if (r < 0) |
a354329f | 46 | return r; |
a354329f LP |
47 | } |
48 | ||
08a0ebc6 | 49 | *ret = TAKE_PTR(s); |
a354329f LP |
50 | return 0; |
51 | } | |
52 | ||
e4077ff6 | 53 | void fdset_close(FDSet *s) { |
a16e1123 LP |
54 | void *p; |
55 | ||
56 | while ((p = set_steal_first(MAKE_SET(s)))) { | |
91a64476 LP |
57 | int fd = PTR_TO_FD(p); |
58 | ||
e4077ff6 LP |
59 | /* Valgrind's fd might have ended up in this set here, due to fdset_new_fill(). We'll ignore |
60 | * all failures here, so that the EBADFD that valgrind will return us on close() doesn't | |
61 | * influence us */ | |
62 | ||
63 | /* When reloading duplicates of the private bus connection fds and suchlike are closed here, | |
64 | * which has no effect at all, since they are only duplicates. So don't be surprised about | |
65 | * these log messages. */ | |
66 | ||
91a64476 LP |
67 | if (DEBUG_LOGGING) { |
68 | _cleanup_free_ char *path = NULL; | |
69 | ||
70 | (void) fd_get_path(fd, &path); | |
71 | log_debug("Closing set fd %i (%s)", fd, strna(path)); | |
72 | } | |
73 | ||
74 | (void) close_nointr(fd); | |
a16e1123 | 75 | } |
e4077ff6 | 76 | } |
a16e1123 | 77 | |
e4077ff6 LP |
78 | FDSet* fdset_free(FDSet *s) { |
79 | fdset_close(s); | |
a16e1123 | 80 | set_free(MAKE_SET(s)); |
a354329f | 81 | return NULL; |
a16e1123 LP |
82 | } |
83 | ||
84 | int fdset_put(FDSet *s, int fd) { | |
85 | assert(s); | |
86 | assert(fd >= 0); | |
87 | ||
cc938f1c FS |
88 | /* Avoid integer overflow in FD_TO_PTR() */ |
89 | if (fd == INT_MAX) | |
90 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Refusing invalid fd: %d", fd); | |
91 | ||
a16e1123 LP |
92 | return set_put(MAKE_SET(s), FD_TO_PTR(fd)); |
93 | } | |
94 | ||
e829f28c LP |
95 | int fdset_consume(FDSet *s, int fd) { |
96 | int r; | |
97 | ||
98 | assert(s); | |
99 | assert(fd >= 0); | |
100 | ||
101 | r = fdset_put(s, fd); | |
102 | if (r < 0) | |
103 | safe_close(fd); | |
104 | ||
105 | return r; | |
106 | } | |
107 | ||
a16e1123 | 108 | int fdset_put_dup(FDSet *s, int fd) { |
08a0ebc6 LP |
109 | _cleanup_close_ int copy = -EBADF; |
110 | int r; | |
a16e1123 LP |
111 | |
112 | assert(s); | |
113 | assert(fd >= 0); | |
114 | ||
e83c7163 LP |
115 | copy = fcntl(fd, F_DUPFD_CLOEXEC, 3); |
116 | if (copy < 0) | |
a16e1123 LP |
117 | return -errno; |
118 | ||
e83c7163 | 119 | r = fdset_put(s, copy); |
08a0ebc6 | 120 | if (r < 0) |
a16e1123 | 121 | return r; |
a16e1123 | 122 | |
08a0ebc6 | 123 | return TAKE_FD(copy); |
a16e1123 LP |
124 | } |
125 | ||
126 | bool fdset_contains(FDSet *s, int fd) { | |
127 | assert(s); | |
128 | assert(fd >= 0); | |
129 | ||
cc938f1c FS |
130 | /* Avoid integer overflow in FD_TO_PTR() */ |
131 | if (fd == INT_MAX) { | |
132 | log_debug("Refusing invalid fd: %d", fd); | |
133 | return false; | |
134 | } | |
135 | ||
a16e1123 LP |
136 | return !!set_get(MAKE_SET(s), FD_TO_PTR(fd)); |
137 | } | |
138 | ||
139 | int fdset_remove(FDSet *s, int fd) { | |
140 | assert(s); | |
141 | assert(fd >= 0); | |
142 | ||
cc938f1c FS |
143 | /* Avoid integer overflow in FD_TO_PTR() */ |
144 | if (fd == INT_MAX) | |
145 | return log_debug_errno(SYNTHETIC_ERRNO(ENOENT), "Refusing invalid fd: %d", fd); | |
146 | ||
a16e1123 LP |
147 | return set_remove(MAKE_SET(s), FD_TO_PTR(fd)) ? fd : -ENOENT; |
148 | } | |
149 | ||
a3dff21a LP |
150 | int fdset_new_fill( |
151 | int filter_cloexec, /* if < 0 takes all fds, otherwise only those with O_CLOEXEC set (1) or unset (0) */ | |
152 | FDSet **ret) { | |
a2467ea8 | 153 | |
08a0ebc6 | 154 | _cleanup_(fdset_shallow_freep) FDSet *s = NULL; |
e1d75803 | 155 | _cleanup_closedir_ DIR *d = NULL; |
08a0ebc6 | 156 | int r; |
a16e1123 | 157 | |
08a0ebc6 | 158 | assert(ret); |
a16e1123 | 159 | |
a2467ea8 MY |
160 | /* Creates an fdset and fills in all currently open file descriptors. Also set all collected fds |
161 | * to CLOEXEC. */ | |
a16e1123 | 162 | |
e83c7163 | 163 | d = opendir("/proc/self/fd"); |
08a0ebc6 LP |
164 | if (!d) { |
165 | if (errno == ENOENT && proc_mounted() == 0) | |
166 | return -ENOSYS; | |
167 | ||
a16e1123 | 168 | return -errno; |
08a0ebc6 | 169 | } |
a16e1123 | 170 | |
e83c7163 | 171 | s = fdset_new(); |
08a0ebc6 LP |
172 | if (!s) |
173 | return -ENOMEM; | |
a16e1123 | 174 | |
8fb3f009 | 175 | FOREACH_DIRENT(de, d, return -errno) { |
42dc1cd4 | 176 | int fd; |
a16e1123 | 177 | |
42dc1cd4 LP |
178 | if (!IN_SET(de->d_type, DT_LNK, DT_UNKNOWN)) |
179 | continue; | |
180 | ||
181 | fd = parse_fd(de->d_name); | |
182 | if (fd < 0) | |
183 | return fd; | |
a16e1123 LP |
184 | |
185 | if (fd < 3) | |
186 | continue; | |
a16e1123 LP |
187 | if (fd == dirfd(d)) |
188 | continue; | |
189 | ||
a3dff21a LP |
190 | if (filter_cloexec >= 0) { |
191 | int fl; | |
192 | ||
193 | /* If user asked for that filter by O_CLOEXEC. This is useful so that fds that have | |
194 | * been passed in can be collected and fds which have been created locally can be | |
195 | * ignored, under the assumption that only the latter have O_CLOEXEC set. */ | |
a2467ea8 | 196 | |
a3dff21a LP |
197 | fl = fcntl(fd, F_GETFD); |
198 | if (fl < 0) | |
199 | return -errno; | |
200 | ||
201 | if (FLAGS_SET(fl, FD_CLOEXEC) != !!filter_cloexec) | |
202 | continue; | |
203 | } | |
204 | ||
a2467ea8 MY |
205 | /* We need to set CLOEXEC manually only if we're collecting non-CLOEXEC fds. */ |
206 | if (filter_cloexec <= 0) { | |
207 | r = fd_cloexec(fd, true); | |
208 | if (r < 0) | |
209 | return r; | |
210 | } | |
211 | ||
e83c7163 LP |
212 | r = fdset_put(s, fd); |
213 | if (r < 0) | |
08a0ebc6 | 214 | return r; |
a16e1123 LP |
215 | } |
216 | ||
08a0ebc6 LP |
217 | *ret = TAKE_PTR(s); |
218 | return 0; | |
a16e1123 LP |
219 | } |
220 | ||
221 | int fdset_cloexec(FDSet *fds, bool b) { | |
a16e1123 LP |
222 | void *p; |
223 | int r; | |
224 | ||
225 | assert(fds); | |
226 | ||
90e74a66 | 227 | SET_FOREACH(p, MAKE_SET(fds)) { |
3cc2aff1 LP |
228 | r = fd_cloexec(PTR_TO_FD(p), b); |
229 | if (r < 0) | |
a16e1123 | 230 | return r; |
3cc2aff1 | 231 | } |
a16e1123 LP |
232 | |
233 | return 0; | |
234 | } | |
e83c7163 | 235 | |
08a0ebc6 LP |
236 | int fdset_new_listen_fds(FDSet **ret, bool unset) { |
237 | _cleanup_(fdset_shallow_freep) FDSet *s = NULL; | |
e83c7163 | 238 | int n, fd, r; |
e83c7163 | 239 | |
08a0ebc6 | 240 | assert(ret); |
e83c7163 LP |
241 | |
242 | /* Creates an fdset and fills in all passed file descriptors */ | |
243 | ||
244 | s = fdset_new(); | |
08a0ebc6 LP |
245 | if (!s) |
246 | return -ENOMEM; | |
e83c7163 LP |
247 | |
248 | n = sd_listen_fds(unset); | |
b3a9d980 | 249 | for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) { |
e83c7163 LP |
250 | r = fdset_put(s, fd); |
251 | if (r < 0) | |
08a0ebc6 | 252 | return r; |
e83c7163 LP |
253 | } |
254 | ||
08a0ebc6 | 255 | *ret = TAKE_PTR(s); |
e83c7163 | 256 | return 0; |
e83c7163 LP |
257 | } |
258 | ||
bdcad22e LP |
259 | int fdset_to_array(FDSet *fds, int **ret) { |
260 | unsigned j = 0, m; | |
08a0ebc6 | 261 | void *e; |
bdcad22e | 262 | int *a; |
e83c7163 | 263 | |
bdcad22e | 264 | assert(ret); |
08a0ebc6 | 265 | |
bdcad22e LP |
266 | m = fdset_size(fds); |
267 | if (m > INT_MAX) /* We want to be able to return an "int" */ | |
268 | return -ENOMEM; | |
269 | if (m == 0) { | |
270 | *ret = NULL; /* suppress array allocation if empty */ | |
271 | return 0; | |
8192548e | 272 | } |
e83c7163 | 273 | |
bdcad22e LP |
274 | a = new(int, m); |
275 | if (!a) | |
276 | return -ENOMEM; | |
277 | ||
278 | SET_FOREACH(e, MAKE_SET(fds)) | |
279 | a[j++] = PTR_TO_FD(e); | |
280 | ||
e83c7163 LP |
281 | assert(j == m); |
282 | ||
bdcad22e LP |
283 | *ret = TAKE_PTR(a); |
284 | return (int) m; | |
285 | } | |
286 | ||
287 | int fdset_close_others(FDSet *fds) { | |
288 | _cleanup_free_ int *a = NULL; | |
289 | int n; | |
290 | ||
291 | n = fdset_to_array(fds, &a); | |
292 | if (n < 0) | |
293 | return n; | |
294 | ||
295 | return close_all_fds(a, n); | |
e83c7163 LP |
296 | } |
297 | ||
298 | unsigned fdset_size(FDSet *fds) { | |
299 | return set_size(MAKE_SET(fds)); | |
300 | } | |
301 | ||
a354329f LP |
302 | bool fdset_isempty(FDSet *fds) { |
303 | return set_isempty(MAKE_SET(fds)); | |
304 | } | |
305 | ||
e83c7163 LP |
306 | int fdset_iterate(FDSet *s, Iterator *i) { |
307 | void *p; | |
308 | ||
8927b1da | 309 | if (!set_iterate(MAKE_SET(s), i, &p)) |
e83c7163 LP |
310 | return -ENOENT; |
311 | ||
312 | return PTR_TO_FD(p); | |
313 | } | |
a354329f LP |
314 | |
315 | int fdset_steal_first(FDSet *fds) { | |
316 | void *p; | |
317 | ||
318 | p = set_steal_first(MAKE_SET(fds)); | |
319 | if (!p) | |
320 | return -ENOENT; | |
321 | ||
322 | return PTR_TO_FD(p); | |
323 | } |