1 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- |
---|
2 | * |
---|
3 | * Copyright (C) 2007 William Jon McCann <mccann@jhu.edu> |
---|
4 | * |
---|
5 | * This program is free software; you can redistribute it and/or modify |
---|
6 | * it under the terms of the GNU General Public License as published by |
---|
7 | * the Free Software Foundation; either version 2 of the License, or |
---|
8 | * (at your option) any later version. |
---|
9 | * |
---|
10 | * This program is distributed in the hope that it will be useful, |
---|
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
13 | * GNU General Public License for more details. |
---|
14 | * |
---|
15 | * You should have received a copy of the GNU General Public License |
---|
16 | * along with this program; if not, write to the Free Software |
---|
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
---|
18 | * |
---|
19 | */ |
---|
20 | |
---|
21 | #include "config.h" |
---|
22 | |
---|
23 | #include <stdlib.h> |
---|
24 | #include <stdio.h> |
---|
25 | #include <fcntl.h> |
---|
26 | #include <unistd.h> |
---|
27 | #include <string.h> |
---|
28 | #include <sys/types.h> |
---|
29 | #include <sys/wait.h> |
---|
30 | #include <errno.h> |
---|
31 | #include <signal.h> |
---|
32 | |
---|
33 | #include <glib.h> |
---|
34 | #include <glib/gi18n.h> |
---|
35 | #include <glib/gstdio.h> |
---|
36 | #include <glib-object.h> |
---|
37 | |
---|
38 | #include "gdm-common.h" |
---|
39 | |
---|
40 | #include "gdm-slave-proxy.h" |
---|
41 | |
---|
42 | #define GDM_SLAVE_PROXY_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GDM_TYPE_SLAVE_PROXY, GdmSlaveProxyPrivate)) |
---|
43 | |
---|
44 | #define MAX_LOGS 5 |
---|
45 | |
---|
46 | struct GdmSlaveProxyPrivate |
---|
47 | { |
---|
48 | char *command; |
---|
49 | char *log_path; |
---|
50 | GPid pid; |
---|
51 | guint child_watch_id; |
---|
52 | }; |
---|
53 | |
---|
54 | enum { |
---|
55 | PROP_0, |
---|
56 | PROP_COMMAND, |
---|
57 | PROP_LOG_PATH, |
---|
58 | }; |
---|
59 | |
---|
60 | enum { |
---|
61 | EXITED, |
---|
62 | DIED, |
---|
63 | LAST_SIGNAL |
---|
64 | }; |
---|
65 | |
---|
66 | static guint signals [LAST_SIGNAL] = { 0, }; |
---|
67 | |
---|
68 | static void gdm_slave_proxy_class_init (GdmSlaveProxyClass *klass); |
---|
69 | static void gdm_slave_proxy_init (GdmSlaveProxy *slave); |
---|
70 | static void gdm_slave_proxy_finalize (GObject *object); |
---|
71 | |
---|
72 | G_DEFINE_TYPE (GdmSlaveProxy, gdm_slave_proxy, G_TYPE_OBJECT) |
---|
73 | |
---|
74 | static void |
---|
75 | child_watch (GPid pid, |
---|
76 | int status, |
---|
77 | GdmSlaveProxy *slave) |
---|
78 | { |
---|
79 | g_debug ("GdmSlaveProxy: slave (pid:%d) done (%s:%d)", |
---|
80 | (int) pid, |
---|
81 | WIFEXITED (status) ? "status" |
---|
82 | : WIFSIGNALED (status) ? "signal" |
---|
83 | : "unknown", |
---|
84 | WIFEXITED (status) ? WEXITSTATUS (status) |
---|
85 | : WIFSIGNALED (status) ? WTERMSIG (status) |
---|
86 | : -1); |
---|
87 | |
---|
88 | g_spawn_close_pid (slave->priv->pid); |
---|
89 | slave->priv->pid = -1; |
---|
90 | slave->priv->child_watch_id = 0; |
---|
91 | |
---|
92 | if (WIFEXITED (status)) { |
---|
93 | int code = WEXITSTATUS (status); |
---|
94 | g_signal_emit (slave, signals [EXITED], 0, code); |
---|
95 | } else if (WIFSIGNALED (status)) { |
---|
96 | int num = WTERMSIG (status); |
---|
97 | g_signal_emit (slave, signals [DIED], 0, num); |
---|
98 | } |
---|
99 | } |
---|
100 | |
---|
101 | static void |
---|
102 | rotate_logs (const char *path, |
---|
103 | guint n_copies) |
---|
104 | { |
---|
105 | int i; |
---|
106 | |
---|
107 | for (i = n_copies - 1; i > 0; i--) { |
---|
108 | char *name_n; |
---|
109 | char *name_n1; |
---|
110 | |
---|
111 | name_n = g_strdup_printf ("%s.%d", path, i); |
---|
112 | if (i > 1) { |
---|
113 | name_n1 = g_strdup_printf ("%s.%d", path, i - 1); |
---|
114 | } else { |
---|
115 | name_n1 = g_strdup (path); |
---|
116 | } |
---|
117 | |
---|
118 | VE_IGNORE_EINTR (g_unlink (name_n)); |
---|
119 | VE_IGNORE_EINTR (g_rename (name_n1, name_n)); |
---|
120 | |
---|
121 | g_free (name_n1); |
---|
122 | g_free (name_n); |
---|
123 | } |
---|
124 | |
---|
125 | VE_IGNORE_EINTR (g_unlink (path)); |
---|
126 | } |
---|
127 | |
---|
128 | typedef struct { |
---|
129 | const char *log_file; |
---|
130 | } SpawnChildData; |
---|
131 | |
---|
132 | static void |
---|
133 | spawn_child_setup (SpawnChildData *data) |
---|
134 | { |
---|
135 | |
---|
136 | if (data->log_file != NULL) { |
---|
137 | int logfd; |
---|
138 | |
---|
139 | rotate_logs (data->log_file, MAX_LOGS); |
---|
140 | |
---|
141 | VE_IGNORE_EINTR (g_unlink (data->log_file)); |
---|
142 | VE_IGNORE_EINTR (logfd = open (data->log_file, O_CREAT|O_APPEND|O_TRUNC|O_WRONLY|O_EXCL, 0644)); |
---|
143 | |
---|
144 | if (logfd != -1) { |
---|
145 | VE_IGNORE_EINTR (dup2 (logfd, 1)); |
---|
146 | VE_IGNORE_EINTR (dup2 (logfd, 2)); |
---|
147 | close (logfd); |
---|
148 | } |
---|
149 | } |
---|
150 | } |
---|
151 | |
---|
152 | static gboolean |
---|
153 | spawn_command_line_async (const char *command_line, |
---|
154 | const char *log_file, |
---|
155 | char **env, |
---|
156 | GPid *child_pid, |
---|
157 | GError **error) |
---|
158 | { |
---|
159 | char **argv; |
---|
160 | GError *local_error; |
---|
161 | gboolean ret; |
---|
162 | gboolean res; |
---|
163 | SpawnChildData data; |
---|
164 | |
---|
165 | ret = FALSE; |
---|
166 | |
---|
167 | argv = NULL; |
---|
168 | local_error = NULL; |
---|
169 | if (! g_shell_parse_argv (command_line, NULL, &argv, &local_error)) { |
---|
170 | g_warning ("Could not parse command: %s", local_error->message); |
---|
171 | g_propagate_error (error, local_error); |
---|
172 | goto out; |
---|
173 | } |
---|
174 | |
---|
175 | data.log_file = log_file; |
---|
176 | |
---|
177 | local_error = NULL; |
---|
178 | res = g_spawn_async (NULL, |
---|
179 | argv, |
---|
180 | env, |
---|
181 | G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD, |
---|
182 | (GSpawnChildSetupFunc)spawn_child_setup, |
---|
183 | &data, |
---|
184 | child_pid, |
---|
185 | &local_error); |
---|
186 | |
---|
187 | if (! res) { |
---|
188 | g_warning ("Could not spawn command: %s", local_error->message); |
---|
189 | g_propagate_error (error, local_error); |
---|
190 | goto out; |
---|
191 | } |
---|
192 | |
---|
193 | ret = TRUE; |
---|
194 | out: |
---|
195 | g_strfreev (argv); |
---|
196 | |
---|
197 | return ret; |
---|
198 | } |
---|
199 | |
---|
200 | static gboolean |
---|
201 | spawn_slave (GdmSlaveProxy *slave) |
---|
202 | { |
---|
203 | gboolean result; |
---|
204 | GError *error; |
---|
205 | |
---|
206 | g_debug ("GdmSlaveProxy: Running command: %s", slave->priv->command); |
---|
207 | |
---|
208 | error = NULL; |
---|
209 | result = spawn_command_line_async (slave->priv->command, |
---|
210 | slave->priv->log_path, |
---|
211 | NULL, |
---|
212 | &slave->priv->pid, |
---|
213 | &error); |
---|
214 | if (! result) { |
---|
215 | g_warning ("Could not start command '%s': %s", slave->priv->command, error->message); |
---|
216 | g_error_free (error); |
---|
217 | goto out; |
---|
218 | } |
---|
219 | |
---|
220 | g_debug ("GdmSlaveProxy: Started slave with pid %d", slave->priv->pid); |
---|
221 | |
---|
222 | slave->priv->child_watch_id = g_child_watch_add (slave->priv->pid, |
---|
223 | (GChildWatchFunc)child_watch, |
---|
224 | slave); |
---|
225 | |
---|
226 | result = TRUE; |
---|
227 | |
---|
228 | out: |
---|
229 | |
---|
230 | return result; |
---|
231 | } |
---|
232 | |
---|
233 | static void |
---|
234 | kill_slave (GdmSlaveProxy *slave) |
---|
235 | { |
---|
236 | int exit_status; |
---|
237 | int res; |
---|
238 | |
---|
239 | if (slave->priv->pid <= 1) { |
---|
240 | return; |
---|
241 | } |
---|
242 | |
---|
243 | res = gdm_signal_pid (slave->priv->pid, SIGTERM); |
---|
244 | if (res < 0) { |
---|
245 | g_warning ("Unable to kill slave process"); |
---|
246 | } else { |
---|
247 | exit_status = gdm_wait_on_pid (slave->priv->pid); |
---|
248 | g_spawn_close_pid (slave->priv->pid); |
---|
249 | slave->priv->pid = 0; |
---|
250 | } |
---|
251 | } |
---|
252 | |
---|
253 | gboolean |
---|
254 | gdm_slave_proxy_start (GdmSlaveProxy *slave) |
---|
255 | { |
---|
256 | spawn_slave (slave); |
---|
257 | |
---|
258 | return TRUE; |
---|
259 | } |
---|
260 | |
---|
261 | gboolean |
---|
262 | gdm_slave_proxy_stop (GdmSlaveProxy *slave) |
---|
263 | { |
---|
264 | g_debug ("GdmSlaveProxy: Killing slave"); |
---|
265 | |
---|
266 | if (slave->priv->child_watch_id > 0) { |
---|
267 | g_source_remove (slave->priv->child_watch_id); |
---|
268 | slave->priv->child_watch_id = 0; |
---|
269 | } |
---|
270 | |
---|
271 | kill_slave (slave); |
---|
272 | |
---|
273 | return TRUE; |
---|
274 | } |
---|
275 | |
---|
276 | void |
---|
277 | gdm_slave_proxy_set_command (GdmSlaveProxy *slave, |
---|
278 | const char *command) |
---|
279 | { |
---|
280 | g_free (slave->priv->command); |
---|
281 | slave->priv->command = g_strdup (command); |
---|
282 | } |
---|
283 | |
---|
284 | void |
---|
285 | gdm_slave_proxy_set_log_path (GdmSlaveProxy *slave, |
---|
286 | const char *path) |
---|
287 | { |
---|
288 | g_free (slave->priv->log_path); |
---|
289 | slave->priv->log_path = g_strdup (path); |
---|
290 | } |
---|
291 | |
---|
292 | static void |
---|
293 | gdm_slave_proxy_set_property (GObject *object, |
---|
294 | guint prop_id, |
---|
295 | const GValue *value, |
---|
296 | GParamSpec *pspec) |
---|
297 | { |
---|
298 | GdmSlaveProxy *self; |
---|
299 | |
---|
300 | self = GDM_SLAVE_PROXY (object); |
---|
301 | |
---|
302 | switch (prop_id) { |
---|
303 | case PROP_COMMAND: |
---|
304 | gdm_slave_proxy_set_command (self, g_value_get_string (value)); |
---|
305 | break; |
---|
306 | case PROP_LOG_PATH: |
---|
307 | gdm_slave_proxy_set_log_path (self, g_value_get_string (value)); |
---|
308 | break; |
---|
309 | default: |
---|
310 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
---|
311 | break; |
---|
312 | } |
---|
313 | } |
---|
314 | |
---|
315 | static void |
---|
316 | gdm_slave_proxy_get_property (GObject *object, |
---|
317 | guint prop_id, |
---|
318 | GValue *value, |
---|
319 | GParamSpec *pspec) |
---|
320 | { |
---|
321 | GdmSlaveProxy *self; |
---|
322 | |
---|
323 | self = GDM_SLAVE_PROXY (object); |
---|
324 | |
---|
325 | switch (prop_id) { |
---|
326 | case PROP_COMMAND: |
---|
327 | g_value_set_string (value, self->priv->command); |
---|
328 | break; |
---|
329 | case PROP_LOG_PATH: |
---|
330 | g_value_set_string (value, self->priv->log_path); |
---|
331 | break; |
---|
332 | default: |
---|
333 | G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
---|
334 | break; |
---|
335 | } |
---|
336 | } |
---|
337 | |
---|
338 | static void |
---|
339 | gdm_slave_proxy_dispose (GObject *object) |
---|
340 | { |
---|
341 | GdmSlaveProxy *slave; |
---|
342 | |
---|
343 | slave = GDM_SLAVE_PROXY (object); |
---|
344 | |
---|
345 | g_debug ("GdmSlaveProxy: Disposing slave proxy"); |
---|
346 | gdm_slave_proxy_stop (slave); |
---|
347 | |
---|
348 | G_OBJECT_CLASS (gdm_slave_proxy_parent_class)->dispose (object); |
---|
349 | } |
---|
350 | |
---|
351 | static void |
---|
352 | gdm_slave_proxy_class_init (GdmSlaveProxyClass *klass) |
---|
353 | { |
---|
354 | GObjectClass *object_class = G_OBJECT_CLASS (klass); |
---|
355 | |
---|
356 | object_class->get_property = gdm_slave_proxy_get_property; |
---|
357 | object_class->set_property = gdm_slave_proxy_set_property; |
---|
358 | object_class->dispose = gdm_slave_proxy_dispose; |
---|
359 | object_class->finalize = gdm_slave_proxy_finalize; |
---|
360 | |
---|
361 | g_type_class_add_private (klass, sizeof (GdmSlaveProxyPrivate)); |
---|
362 | |
---|
363 | g_object_class_install_property (object_class, |
---|
364 | PROP_COMMAND, |
---|
365 | g_param_spec_string ("command", |
---|
366 | "command", |
---|
367 | "command", |
---|
368 | NULL, |
---|
369 | G_PARAM_READWRITE | G_PARAM_CONSTRUCT)); |
---|
370 | g_object_class_install_property (object_class, |
---|
371 | PROP_LOG_PATH, |
---|
372 | g_param_spec_string ("log-path", |
---|
373 | "log path", |
---|
374 | "log path", |
---|
375 | NULL, |
---|
376 | G_PARAM_READWRITE | G_PARAM_CONSTRUCT)); |
---|
377 | |
---|
378 | signals [EXITED] = |
---|
379 | g_signal_new ("exited", |
---|
380 | G_OBJECT_CLASS_TYPE (object_class), |
---|
381 | G_SIGNAL_RUN_FIRST, |
---|
382 | G_STRUCT_OFFSET (GdmSlaveProxyClass, exited), |
---|
383 | NULL, |
---|
384 | NULL, |
---|
385 | g_cclosure_marshal_VOID__INT, |
---|
386 | G_TYPE_NONE, |
---|
387 | 1, |
---|
388 | G_TYPE_INT); |
---|
389 | |
---|
390 | signals [DIED] = |
---|
391 | g_signal_new ("died", |
---|
392 | G_OBJECT_CLASS_TYPE (object_class), |
---|
393 | G_SIGNAL_RUN_FIRST, |
---|
394 | G_STRUCT_OFFSET (GdmSlaveProxyClass, died), |
---|
395 | NULL, |
---|
396 | NULL, |
---|
397 | g_cclosure_marshal_VOID__INT, |
---|
398 | G_TYPE_NONE, |
---|
399 | 1, |
---|
400 | G_TYPE_INT); |
---|
401 | } |
---|
402 | |
---|
403 | static void |
---|
404 | gdm_slave_proxy_init (GdmSlaveProxy *slave) |
---|
405 | { |
---|
406 | |
---|
407 | slave->priv = GDM_SLAVE_PROXY_GET_PRIVATE (slave); |
---|
408 | |
---|
409 | slave->priv->pid = -1; |
---|
410 | } |
---|
411 | |
---|
412 | static void |
---|
413 | gdm_slave_proxy_finalize (GObject *object) |
---|
414 | { |
---|
415 | GdmSlaveProxy *slave; |
---|
416 | |
---|
417 | g_return_if_fail (object != NULL); |
---|
418 | g_return_if_fail (GDM_IS_SLAVE_PROXY (object)); |
---|
419 | |
---|
420 | slave = GDM_SLAVE_PROXY (object); |
---|
421 | |
---|
422 | g_return_if_fail (slave->priv != NULL); |
---|
423 | |
---|
424 | g_free (slave->priv->command); |
---|
425 | |
---|
426 | G_OBJECT_CLASS (gdm_slave_proxy_parent_class)->finalize (object); |
---|
427 | } |
---|
428 | |
---|
429 | GdmSlaveProxy * |
---|
430 | gdm_slave_proxy_new (void) |
---|
431 | { |
---|
432 | GObject *object; |
---|
433 | |
---|
434 | object = g_object_new (GDM_TYPE_SLAVE_PROXY, |
---|
435 | NULL); |
---|
436 | |
---|
437 | return GDM_SLAVE_PROXY (object); |
---|
438 | } |
---|