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Commit | Line | Data |
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5cb5a6ff LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
3 | #include <assert.h> | |
034c6ed7 LP |
4 | #include <dirent.h> |
5 | #include <errno.h> | |
6 | #include <fcntl.h> | |
7 | #include <unistd.h> | |
44d8db9e | 8 | #include <string.h> |
5cb5a6ff LP |
9 | |
10 | #include "execute.h" | |
11 | #include "strv.h" | |
12 | #include "macro.h" | |
13 | #include "util.h" | |
14 | ||
034c6ed7 LP |
15 | static int close_fds(int except[], unsigned n_except) { |
16 | DIR *d; | |
17 | struct dirent *de; | |
18 | int r = 0; | |
19 | ||
20 | /* Modifies the fds array! (sorts it) */ | |
21 | ||
22 | if (!(d = opendir("/proc/self/fd"))) | |
23 | return -errno; | |
24 | ||
25 | while ((de = readdir(d))) { | |
26 | int fd; | |
27 | ||
28 | if (de->d_name[0] == '.') | |
29 | continue; | |
30 | ||
31 | if ((r = safe_atoi(de->d_name, &fd)) < 0) | |
32 | goto finish; | |
33 | ||
34 | if (fd < 3) | |
35 | continue; | |
36 | ||
37 | if (fd == dirfd(d)) | |
38 | continue; | |
39 | ||
40 | if (except) { | |
41 | bool found; | |
42 | unsigned i; | |
43 | ||
44 | found = false; | |
45 | for (i = 0; i < n_except; i++) | |
46 | if (except[i] == fd) { | |
47 | found = true; | |
48 | break; | |
49 | } | |
50 | ||
51 | if (found) | |
52 | continue; | |
53 | } | |
54 | ||
55 | if ((r = close_nointr(fd)) < 0) | |
56 | goto finish; | |
57 | } | |
58 | ||
59 | finish: | |
60 | closedir(d); | |
61 | return r; | |
62 | } | |
63 | ||
64 | static int shift_fds(int fds[], unsigned n_fds) { | |
65 | int start, restart_from; | |
66 | ||
67 | if (n_fds <= 0) | |
68 | return 0; | |
69 | ||
70 | assert(fds); | |
71 | ||
72 | start = 0; | |
73 | for (;;) { | |
74 | int i; | |
75 | ||
76 | restart_from = -1; | |
77 | ||
78 | for (i = start; i < (int) n_fds; i++) { | |
79 | int nfd; | |
80 | ||
81 | /* Already at right index? */ | |
82 | if (fds[i] == i+3) | |
83 | continue; | |
84 | ||
85 | if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0) | |
86 | return -errno; | |
87 | ||
88 | assert_se(close_nointr(fds[i])); | |
89 | fds[i] = nfd; | |
90 | ||
91 | /* Hmm, the fd we wanted isn't free? Then | |
92 | * let's remember that and try again from here*/ | |
93 | if (nfd != i+3 && restart_from < 0) | |
94 | restart_from = i; | |
95 | } | |
96 | ||
97 | if (restart_from < 0) | |
98 | break; | |
99 | ||
100 | start = restart_from; | |
101 | } | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | int exec_spawn(const ExecCommand *command, const ExecContext *context, int *fds, unsigned n_fds, pid_t *ret) { | |
107 | pid_t pid; | |
108 | ||
5cb5a6ff LP |
109 | assert(command); |
110 | assert(context); | |
111 | assert(ret); | |
034c6ed7 LP |
112 | assert(fds || n_fds <= 0); |
113 | ||
114 | if ((pid = fork()) < 0) | |
115 | return -errno; | |
116 | ||
117 | if (pid == 0) { | |
118 | char **e, **f = NULL; | |
119 | int i, r; | |
120 | char t[16]; | |
121 | /* child */ | |
5cb5a6ff | 122 | |
034c6ed7 LP |
123 | umask(context->umask); |
124 | ||
125 | if (chdir(context->directory ? context->directory : "/") < 0) { | |
126 | r = EXIT_CHDIR; | |
127 | goto fail; | |
128 | } | |
129 | ||
130 | snprintf(t, sizeof(t), "%i", context->oom_adjust); | |
131 | char_array_0(t); | |
132 | ||
133 | if (write_one_line_file("/proc/self/oom_adj", t) < 0) { | |
134 | r = EXIT_OOM_ADJUST; | |
135 | goto fail; | |
136 | } | |
137 | ||
138 | if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { | |
139 | r = EXIT_NICE; | |
140 | goto fail; | |
141 | } | |
142 | ||
143 | if (close_fds(fds, n_fds) < 0 || | |
144 | shift_fds(fds, n_fds) < 0) { | |
145 | r = EXIT_FDS; | |
146 | goto fail; | |
147 | } | |
148 | ||
149 | for (i = 0; i < RLIMIT_NLIMITS; i++) { | |
150 | if (!context->rlimit[i]) | |
151 | continue; | |
152 | ||
153 | if (setrlimit(i, context->rlimit[i]) < 0) { | |
154 | r = EXIT_LIMITS; | |
155 | goto fail; | |
156 | } | |
157 | } | |
158 | ||
159 | if (n_fds > 0) { | |
160 | char a[64], b[64]; | |
161 | char *listen_env[3] = { | |
162 | a, | |
163 | b, | |
164 | NULL | |
165 | }; | |
166 | ||
167 | snprintf(a, sizeof(a), "LISTEN_PID=%llu", (unsigned long long) getpid()); | |
168 | snprintf(b, sizeof(b), "LISTEN_FDS=%u", n_fds); | |
169 | ||
170 | a[sizeof(a)-1] = 0; | |
171 | b[sizeof(b)-1] = 0; | |
172 | ||
173 | if (context->environment) { | |
174 | if (!(f = strv_merge(listen_env, context->environment))) { | |
175 | r = EXIT_MEMORY; | |
176 | goto fail; | |
177 | } | |
178 | e = f; | |
179 | } else | |
180 | e = listen_env; | |
181 | ||
182 | } else | |
183 | e = context->environment; | |
184 | ||
185 | execve(command->path, command->argv, e); | |
186 | r = EXIT_EXEC; | |
187 | ||
188 | fail: | |
189 | strv_free(f); | |
190 | _exit(r); | |
191 | } | |
192 | ||
193 | *ret = pid; | |
5cb5a6ff LP |
194 | return 0; |
195 | } | |
196 | ||
034c6ed7 LP |
197 | void exec_context_init(ExecContext *c) { |
198 | assert(c); | |
199 | ||
200 | c->umask = 0002; | |
201 | cap_clear(c->capabilities); | |
202 | c->oom_adjust = 0; | |
203 | c->nice = 0; | |
204 | } | |
205 | ||
206 | void exec_context_done(ExecContext *c) { | |
5cb5a6ff LP |
207 | unsigned l; |
208 | ||
209 | assert(c); | |
210 | ||
211 | strv_free(c->environment); | |
034c6ed7 | 212 | c->environment = NULL; |
5cb5a6ff | 213 | |
034c6ed7 | 214 | for (l = 0; l < ELEMENTSOF(c->rlimit); l++) { |
5cb5a6ff | 215 | free(c->rlimit[l]); |
034c6ed7 LP |
216 | c->rlimit[l] = NULL; |
217 | } | |
218 | ||
219 | free(c->directory); | |
220 | c->directory = NULL; | |
5cb5a6ff | 221 | |
5cb5a6ff | 222 | free(c->user); |
034c6ed7 LP |
223 | c->user = NULL; |
224 | ||
5cb5a6ff | 225 | free(c->group); |
034c6ed7 LP |
226 | c->group = NULL; |
227 | ||
228 | strv_free(c->supplementary_groups); | |
229 | c->supplementary_groups = NULL; | |
5cb5a6ff LP |
230 | } |
231 | ||
232 | void exec_command_free_list(ExecCommand *c) { | |
233 | ExecCommand *i; | |
234 | ||
235 | while ((i = c)) { | |
034c6ed7 | 236 | LIST_REMOVE(ExecCommand, command, c, i); |
5cb5a6ff LP |
237 | |
238 | free(i->path); | |
44d8db9e | 239 | strv_free(i->argv); |
5cb5a6ff LP |
240 | free(i); |
241 | } | |
242 | } | |
243 | ||
034c6ed7 LP |
244 | void exec_command_free_array(ExecCommand **c, unsigned n) { |
245 | unsigned i; | |
246 | ||
247 | for (i = 0; i < n; i++) { | |
248 | exec_command_free_list(c[i]); | |
249 | c[i] = NULL; | |
250 | } | |
251 | } | |
252 | ||
253 | ||
5cb5a6ff LP |
254 | void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { |
255 | assert(c); | |
256 | assert(f); | |
257 | ||
258 | if (!prefix) | |
259 | prefix = ""; | |
260 | ||
261 | fprintf(f, | |
262 | "%sUmask: %04o\n" | |
034c6ed7 LP |
263 | "%sDirectory: %s\n" |
264 | "%sNice: %i\n" | |
265 | "%sOOMAdjust: %i\n", | |
5cb5a6ff | 266 | prefix, c->umask, |
034c6ed7 LP |
267 | prefix, c->directory ? c->directory : "/", |
268 | prefix, c->nice, | |
269 | prefix, c->oom_adjust); | |
5cb5a6ff LP |
270 | } |
271 | ||
034c6ed7 LP |
272 | void exec_status_fill(ExecStatus *s, pid_t pid, int code, int status) { |
273 | assert(s); | |
5cb5a6ff | 274 | |
034c6ed7 LP |
275 | s->pid = pid; |
276 | s->code = code; | |
277 | s->status = status; | |
278 | s->timestamp = now(CLOCK_REALTIME); | |
5cb5a6ff | 279 | } |
44d8db9e LP |
280 | |
281 | char *exec_command_line(ExecCommand *c) { | |
282 | size_t k; | |
283 | char *n, *p, **a; | |
284 | bool first = true; | |
285 | ||
286 | assert(c); | |
287 | assert(c->argv); | |
288 | ||
289 | k = 0; | |
290 | STRV_FOREACH(a, c->argv) | |
291 | k += strlen(*a)+3; | |
292 | ||
293 | if (!(n = new(char, k))) | |
294 | return NULL; | |
295 | ||
296 | p = n; | |
297 | STRV_FOREACH(a, c->argv) { | |
298 | ||
299 | if (!first) | |
300 | *(p++) = ' '; | |
301 | else | |
302 | first = false; | |
303 | ||
304 | if (strpbrk(*a, WHITESPACE)) { | |
305 | *(p++) = '\''; | |
306 | p = stpcpy(p, *a); | |
307 | *(p++) = '\''; | |
308 | } else | |
309 | p = stpcpy(p, *a); | |
310 | ||
311 | } | |
312 | ||
313 | /* FIXME: this doesn't really handle arguments that have | |
314 | * spaces and ticks in them */ | |
315 | ||
316 | return n; | |
317 | } | |
318 | ||
319 | void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) { | |
320 | char *cmd; | |
321 | ||
322 | assert(c); | |
323 | assert(f); | |
324 | ||
325 | if (!prefix) | |
326 | prefix = ""; | |
327 | ||
328 | cmd = exec_command_line(c); | |
329 | ||
330 | fprintf(f, | |
331 | "%sCommand Line: %s\n", | |
332 | prefix, cmd ? cmd : strerror(ENOMEM)); | |
333 | ||
334 | free(cmd); | |
335 | } | |
336 | ||
337 | void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) { | |
338 | assert(f); | |
339 | ||
340 | if (!prefix) | |
341 | prefix = ""; | |
342 | ||
343 | LIST_FOREACH(command, c, c) | |
344 | exec_command_dump(c, f, prefix); | |
345 | } |