1 /**
2 * collectd - src/unixsock.c
3 * Copyright (C) 2007,2008 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Author:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "common.h"
24 #include "plugin.h"
25 #include "configfile.h"
27 #include "utils_cmd_flush.h"
28 #include "utils_cmd_getval.h"
29 #include "utils_cmd_listval.h"
30 #include "utils_cmd_putval.h"
31 #include "utils_cmd_putnotif.h"
33 /* Folks without pthread will need to disable this plugin. */
34 #include <pthread.h>
36 #include <sys/socket.h>
37 #include <sys/stat.h>
38 #include <sys/un.h>
40 #include <grp.h>
42 #ifndef UNIX_PATH_MAX
43 # define UNIX_PATH_MAX sizeof (((struct sockaddr_un *)0)->sun_path)
44 #endif
46 #define US_DEFAULT_PATH LOCALSTATEDIR"/run/"PACKAGE_NAME"-unixsock"
48 /*
49 * Private variables
50 */
51 /* valid configuration file keys */
52 static const char *config_keys[] =
53 {
54 "SocketFile",
55 "SocketGroup",
56 "SocketPerms"
57 };
58 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
60 static int loop = 0;
62 /* socket configuration */
63 static int sock_fd = -1;
64 static char *sock_file = NULL;
65 static char *sock_group = NULL;
66 static int sock_perms = S_IRWXU | S_IRWXG;
68 static pthread_t listen_thread = (pthread_t) 0;
70 /*
71 * Functions
72 */
73 static int us_open_socket (void)
74 {
75 struct sockaddr_un sa;
76 int status;
78 sock_fd = socket (PF_UNIX, SOCK_STREAM, 0);
79 if (sock_fd < 0)
80 {
81 char errbuf[1024];
82 ERROR ("unixsock plugin: socket failed: %s",
83 sstrerror (errno, errbuf, sizeof (errbuf)));
84 return (-1);
85 }
87 memset (&sa, '\0', sizeof (sa));
88 sa.sun_family = AF_UNIX;
89 strncpy (sa.sun_path, (sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
90 sizeof (sa.sun_path) - 1);
91 /* unlink (sa.sun_path); */
93 DEBUG ("unixsock plugin: socket path = %s", sa.sun_path);
95 status = bind (sock_fd, (struct sockaddr *) &sa, sizeof (sa));
96 if (status != 0)
97 {
98 char errbuf[1024];
99 sstrerror (errno, errbuf, sizeof (errbuf));
100 ERROR ("unixsock plugin: bind failed: %s", errbuf);
101 close (sock_fd);
102 sock_fd = -1;
103 return (-1);
104 }
106 chmod (sa.sun_path, sock_perms);
108 status = listen (sock_fd, 8);
109 if (status != 0)
110 {
111 char errbuf[1024];
112 ERROR ("unixsock plugin: listen failed: %s",
113 sstrerror (errno, errbuf, sizeof (errbuf)));
114 close (sock_fd);
115 sock_fd = -1;
116 return (-1);
117 }
119 do
120 {
121 char *grpname;
122 struct group *g;
123 struct group sg;
124 char grbuf[2048];
126 grpname = (sock_group != NULL) ? sock_group : COLLECTD_GRP_NAME;
127 g = NULL;
129 status = getgrnam_r (grpname, &sg, grbuf, sizeof (grbuf), &g);
130 if (status != 0)
131 {
132 char errbuf[1024];
133 WARNING ("unixsock plugin: getgrnam_r (%s) failed: %s", grpname,
134 sstrerror (errno, errbuf, sizeof (errbuf)));
135 break;
136 }
137 if (g == NULL)
138 {
139 WARNING ("unixsock plugin: No such group: `%s'",
140 grpname);
141 break;
142 }
144 if (chown ((sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
145 (uid_t) -1, g->gr_gid) != 0)
146 {
147 char errbuf[1024];
148 WARNING ("unixsock plugin: chown (%s, -1, %i) failed: %s",
149 (sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
150 (int) g->gr_gid,
151 sstrerror (errno, errbuf, sizeof (errbuf)));
152 }
153 } while (0);
155 return (0);
156 } /* int us_open_socket */
158 static void *us_handle_client (void *arg)
159 {
160 int fd;
161 FILE *fh;
162 char buffer[1024];
163 char *fields[128];
164 int fields_num;
166 fd = *((int *) arg);
167 free (arg);
168 arg = NULL;
170 DEBUG ("Reading from fd #%i", fd);
172 fh = fdopen (fd, "r+");
173 if (fh == NULL)
174 {
175 char errbuf[1024];
176 ERROR ("unixsock plugin: fdopen failed: %s",
177 sstrerror (errno, errbuf, sizeof (errbuf)));
178 close (fd);
179 pthread_exit ((void *) 1);
180 }
182 while (fgets (buffer, sizeof (buffer), fh) != NULL)
183 {
184 int len;
186 len = strlen (buffer);
187 while ((len > 0)
188 && ((buffer[len - 1] == '\n') || (buffer[len - 1] == '\r')))
189 buffer[--len] = '\0';
191 if (len == 0)
192 continue;
194 DEBUG ("fgets -> buffer = %s; len = %i;", buffer, len);
196 fields_num = strsplit (buffer, fields,
197 sizeof (fields) / sizeof (fields[0]));
199 if (fields_num < 1)
200 {
201 close (fd);
202 break;
203 }
205 if (strcasecmp (fields[0], "getval") == 0)
206 {
207 handle_getval (fh, fields, fields_num);
208 }
209 else if (strcasecmp (fields[0], "putval") == 0)
210 {
211 handle_putval (fh, fields, fields_num);
212 }
213 else if (strcasecmp (fields[0], "listval") == 0)
214 {
215 handle_listval (fh, fields, fields_num);
216 }
217 else if (strcasecmp (fields[0], "putnotif") == 0)
218 {
219 handle_putnotif (fh, fields, fields_num);
220 }
221 else if (strcasecmp (fields[0], "flush") == 0)
222 {
223 handle_flush (fh, fields, fields_num);
224 }
225 else
226 {
227 fprintf (fh, "-1 Unknown command: %s\n", fields[0]);
228 fflush (fh);
229 }
230 } /* while (fgets) */
232 DEBUG ("Exiting..");
233 close (fd);
235 pthread_exit ((void *) 0);
236 return ((void *) 0);
237 } /* void *us_handle_client */
239 static void *us_server_thread (void *arg)
240 {
241 int status;
242 int *remote_fd;
243 pthread_t th;
244 pthread_attr_t th_attr;
246 if (us_open_socket () != 0)
247 pthread_exit ((void *) 1);
249 while (loop != 0)
250 {
251 DEBUG ("unixsock plugin: Calling accept..");
252 status = accept (sock_fd, NULL, NULL);
253 if (status < 0)
254 {
255 char errbuf[1024];
257 if (errno == EINTR)
258 continue;
260 ERROR ("unixsock plugin: accept failed: %s",
261 sstrerror (errno, errbuf, sizeof (errbuf)));
262 close (sock_fd);
263 sock_fd = -1;
264 pthread_exit ((void *) 1);
265 }
267 remote_fd = (int *) malloc (sizeof (int));
268 if (remote_fd == NULL)
269 {
270 char errbuf[1024];
271 WARNING ("unixsock plugin: malloc failed: %s",
272 sstrerror (errno, errbuf, sizeof (errbuf)));
273 close (status);
274 continue;
275 }
276 *remote_fd = status;
278 DEBUG ("Spawning child to handle connection on fd #%i", *remote_fd);
280 pthread_attr_init (&th_attr);
281 pthread_attr_setdetachstate (&th_attr, PTHREAD_CREATE_DETACHED);
283 status = pthread_create (&th, &th_attr, us_handle_client, (void *) remote_fd);
284 if (status != 0)
285 {
286 char errbuf[1024];
287 WARNING ("unixsock plugin: pthread_create failed: %s",
288 sstrerror (errno, errbuf, sizeof (errbuf)));
289 close (*remote_fd);
290 free (remote_fd);
291 continue;
292 }
293 } /* while (loop) */
295 close (sock_fd);
296 sock_fd = -1;
298 status = unlink ((sock_file != NULL) ? sock_file : US_DEFAULT_PATH);
299 if (status != 0)
300 {
301 char errbuf[1024];
302 NOTICE ("unixsock plugin: unlink (%s) failed: %s",
303 (sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
304 sstrerror (errno, errbuf, sizeof (errbuf)));
305 }
307 return ((void *) 0);
308 } /* void *us_server_thread */
310 static int us_config (const char *key, const char *val)
311 {
312 if (strcasecmp (key, "SocketFile") == 0)
313 {
314 char *new_sock_file = strdup (val);
315 if (new_sock_file == NULL)
316 return (1);
318 sfree (sock_file);
319 sock_file = new_sock_file;
320 }
321 else if (strcasecmp (key, "SocketGroup") == 0)
322 {
323 char *new_sock_group = strdup (val);
324 if (new_sock_group == NULL)
325 return (1);
327 sfree (sock_group);
328 sock_group = new_sock_group;
329 }
330 else if (strcasecmp (key, "SocketPerms") == 0)
331 {
332 sock_perms = (int) strtol (val, NULL, 8);
333 }
334 else
335 {
336 return (-1);
337 }
339 return (0);
340 } /* int us_config */
342 static int us_init (void)
343 {
344 int status;
346 loop = 1;
348 status = pthread_create (&listen_thread, NULL, us_server_thread, NULL);
349 if (status != 0)
350 {
351 char errbuf[1024];
352 ERROR ("unixsock plugin: pthread_create failed: %s",
353 sstrerror (errno, errbuf, sizeof (errbuf)));
354 return (-1);
355 }
357 return (0);
358 } /* int us_init */
360 static int us_shutdown (void)
361 {
362 void *ret;
364 loop = 0;
366 if (listen_thread != (pthread_t) 0)
367 {
368 pthread_kill (listen_thread, SIGTERM);
369 pthread_join (listen_thread, &ret);
370 listen_thread = (pthread_t) 0;
371 }
373 plugin_unregister_init ("unixsock");
374 plugin_unregister_write ("unixsock");
375 plugin_unregister_shutdown ("unixsock");
377 return (0);
378 } /* int us_shutdown */
380 void module_register (void)
381 {
382 plugin_register_config ("unixsock", us_config,
383 config_keys, config_keys_num);
384 plugin_register_init ("unixsock", us_init);
385 plugin_register_shutdown ("unixsock", us_shutdown);
386 } /* void module_register (void) */
388 /* vim: set sw=4 ts=4 sts=4 tw=78 : */