Add ubus methods for global interface status
[project/netifd.git] / main.c
1 /*
2  * netifd - network interface daemon
3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
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 version 2
7  * as published by the Free Software Foundation
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  */
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <string.h>
17 #include <getopt.h>
18 #include <unistd.h>
19 #include <signal.h>
20 #include <stdarg.h>
21 #include <syslog.h>
22
23 #include "netifd.h"
24 #include "ubus.h"
25 #include "config.h"
26 #include "system.h"
27 #include "interface.h"
28
29 unsigned int debug_mask = 0;
30 const char *main_path = DEFAULT_MAIN_PATH;
31 const char *resolv_conf = DEFAULT_RESOLV_CONF;
32 static char **global_argv;
33
34 static struct list_head process_list = LIST_HEAD_INIT(process_list);
35
36 #define DEFAULT_LOG_LEVEL L_NOTICE
37
38 static int log_level = DEFAULT_LOG_LEVEL;
39 static const int log_class[] = {
40         [L_CRIT] = LOG_CRIT,
41         [L_WARNING] = LOG_WARNING,
42         [L_NOTICE] = LOG_NOTICE,
43         [L_INFO] = LOG_INFO,
44         [L_DEBUG] = LOG_DEBUG
45 };
46
47 #ifdef DUMMY_MODE
48 #define use_syslog false
49 #else
50 static bool use_syslog = true;
51 #endif
52
53
54 static void
55 netifd_delete_process(struct netifd_process *proc)
56 {
57         list_del(&proc->list);
58         ustream_free(&proc->log.stream);
59         close(proc->log.fd.fd);
60 }
61
62 void
63 netifd_log_message(int priority, const char *format, ...)
64 {
65         va_list vl;
66
67         if (priority > log_level)
68                 return;
69
70         va_start(vl, format);
71         if (use_syslog)
72                 vsyslog(log_class[priority], format, vl);
73         else
74                 vfprintf(stderr, format, vl);
75         va_end(vl);
76 }
77
78 static void
79 netifd_process_log_read_cb(struct ustream *s, int bytes)
80 {
81         struct netifd_process *proc;
82         const char *log_prefix;
83         char *data;
84         int len = 0;
85
86         proc = container_of(s, struct netifd_process, log.stream);
87         log_prefix = proc->log_prefix;
88         if (!log_prefix)
89                 log_prefix = "process";
90
91         do {
92                 char *newline;
93
94                 data = ustream_get_read_buf(s, &len);
95                 if (!len)
96                         break;
97
98                 newline = strchr(data, '\n');
99
100                 if (proc->log_overflow) {
101                         if (newline) {
102                                 len = newline + 1 - data;
103                                 proc->log_overflow = false;
104                         }
105                 } else if (newline) {
106                         *newline = 0;
107                         len = newline + 1 - data;
108                         netifd_log_message(L_NOTICE, "%s (%d): %s\n",
109                                 log_prefix, proc->uloop.pid, data);
110                 } else if (len == s->r.buffer_len) {
111                         netifd_log_message(L_NOTICE, "%s (%d): %s [...]\n",
112                                 log_prefix, proc->uloop.pid, data);
113                         proc->log_overflow = true;
114                 } else
115                         break;
116
117                 ustream_consume(s, len);
118         } while (1);
119 }
120
121 static void
122 netifd_process_cb(struct uloop_process *proc, int ret)
123 {
124         struct netifd_process *np;
125         np = container_of(proc, struct netifd_process, uloop);
126
127         while (ustream_poll(&np->log.stream));
128         netifd_delete_process(np);
129         return np->cb(np, ret);
130 }
131
132 int
133 netifd_start_process(const char **argv, char **env, struct netifd_process *proc)
134 {
135         int pfds[2];
136         int pid;
137
138         netifd_kill_process(proc);
139
140         if (pipe(pfds) < 0)
141                 return -1;
142
143         if ((pid = fork()) < 0)
144                 goto error;
145
146         if (!pid) {
147                 if (env) {
148                         while (*env) {
149                                 putenv(*env);
150                                 env++;
151                         }
152                 }
153                 if (proc->dir_fd >= 0)
154                         fchdir(proc->dir_fd);
155
156                 dup2(pfds[1], 0);
157                 dup2(pfds[1], 1);
158                 dup2(pfds[1], 2);
159
160                 close(pfds[0]);
161                 close(pfds[1]);
162
163                 execvp(argv[0], (char **) argv);
164                 exit(127);
165         }
166
167         if (pid < 0)
168                 goto error;
169
170         close(pfds[1]);
171         proc->uloop.cb = netifd_process_cb;
172         proc->uloop.pid = pid;
173         uloop_process_add(&proc->uloop);
174         list_add_tail(&proc->list, &process_list);
175
176         system_fd_set_cloexec(pfds[0]);
177         proc->log.stream.string_data = true;
178         proc->log.stream.notify_read = netifd_process_log_read_cb;
179         ustream_fd_init(&proc->log, pfds[0]);
180
181         return 0;
182
183 error:
184         close(pfds[0]);
185         close(pfds[1]);
186         return -1;
187 }
188
189 void
190 netifd_kill_process(struct netifd_process *proc)
191 {
192         if (!proc->uloop.pending)
193                 return;
194
195         kill(proc->uloop.pid, SIGKILL);
196         uloop_process_delete(&proc->uloop);
197         netifd_delete_process(proc);
198 }
199
200 static void netifd_do_restart(struct uloop_timeout *timeout)
201 {
202         execvp(global_argv[0], global_argv);
203 }
204
205 static void netifd_do_reload(struct uloop_timeout *timeout)
206 {
207         config_init_all();
208 }
209
210 static struct uloop_timeout main_timer;
211
212 void netifd_reload(void)
213 {
214         main_timer.cb = netifd_do_reload;
215         uloop_timeout_set(&main_timer, 100);
216 }
217
218 void netifd_restart(void)
219 {
220         main_timer.cb = netifd_do_restart;
221         interface_set_down(NULL);
222         uloop_timeout_set(&main_timer, 1000);
223 }
224
225 static int usage(const char *progname)
226 {
227         fprintf(stderr, "Usage: %s [options]\n"
228                 "Options:\n"
229                 " -d <mask>:            Mask for debug messages\n"
230                 " -s <path>:            Path to the ubus socket\n"
231                 " -p <path>:            Path to netifd addons (default: %s)\n"
232                 " -h <path>:            Path to the hotplug script\n"
233                 " -r <path>:            Path to resolv.conf\n"
234                 " -l <level>:           Log output level (default: %d)\n"
235                 " -S:                   Use stderr instead of syslog for log messages\n"
236                 "                       (default: "DEFAULT_HOTPLUG_PATH")\n"
237                 "\n", progname, main_path, DEFAULT_LOG_LEVEL);
238
239         return 1;
240 }
241
242 static void
243 netifd_handle_signal(int signo)
244 {
245         uloop_end();
246 }
247
248 static void
249 netifd_setup_signals(void)
250 {
251         struct sigaction s;
252
253         memset(&s, 0, sizeof(s));
254         s.sa_handler = netifd_handle_signal;
255         s.sa_flags = 0;
256         sigaction(SIGINT, &s, NULL);
257         sigaction(SIGTERM, &s, NULL);
258         sigaction(SIGUSR1, &s, NULL);
259         sigaction(SIGUSR2, &s, NULL);
260
261         s.sa_handler = SIG_IGN;
262         sigaction(SIGPIPE, &s, NULL);
263 }
264
265 static void
266 netifd_kill_processes(void)
267 {
268         struct netifd_process *proc, *tmp;
269
270         list_for_each_entry_safe(proc, tmp, &process_list, list)
271                 netifd_kill_process(proc);
272 }
273
274 int main(int argc, char **argv)
275 {
276         const char *socket = NULL;
277         int ch;
278
279         global_argv = argv;
280
281         while ((ch = getopt(argc, argv, "d:s:p:h:r:l:S")) != -1) {
282                 switch(ch) {
283                 case 'd':
284                         debug_mask = strtoul(optarg, NULL, 0);
285                         break;
286                 case 's':
287                         socket = optarg;
288                         break;
289                 case 'p':
290                         main_path = optarg;
291                         break;
292                 case 'h':
293                         hotplug_cmd_path = optarg;
294                         break;
295                 case 'r':
296                         resolv_conf = optarg;
297                         break;
298                 case 'l':
299                         log_level = atoi(optarg);
300                         if (log_level >= ARRAY_SIZE(log_class))
301                                 log_level = ARRAY_SIZE(log_class) - 1;
302                         break;
303 #ifndef DUMMY_MODE
304                 case 'S':
305                         use_syslog = false;
306                         break;
307 #endif
308                 default:
309                         return usage(argv[0]);
310                 }
311         }
312
313         if (use_syslog)
314                 openlog("netifd", 0, LOG_DAEMON);
315
316         netifd_setup_signals();
317         if (netifd_ubus_init(socket) < 0) {
318                 fprintf(stderr, "Failed to connect to ubus\n");
319                 return 1;
320         }
321
322         if (system_init()) {
323                 fprintf(stderr, "Failed to initialize system control\n");
324                 return 1;
325         }
326
327         config_init_all();
328
329         uloop_run();
330         netifd_kill_processes();
331
332         netifd_ubus_done();
333
334         if (use_syslog)
335                 closelog();
336
337         return 0;
338 }