disable ipv6 for bridge member interfaces
[project/netifd.git] / main.c
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <getopt.h>
5 #include <unistd.h>
6 #include <signal.h>
7 #include <stdarg.h>
8 #include <syslog.h>
9
10 #include "netifd.h"
11 #include "ubus.h"
12 #include "config.h"
13 #include "system.h"
14 #include "interface.h"
15
16 unsigned int debug_mask = 0;
17 const char *main_path = DEFAULT_MAIN_PATH;
18 const char *resolv_conf = DEFAULT_RESOLV_CONF;
19 static char **global_argv;
20
21 static struct list_head process_list = LIST_HEAD_INIT(process_list);
22 static struct list_head fds = LIST_HEAD_INIT(fds);
23
24 #define DEFAULT_LOG_LEVEL L_NOTICE
25
26 static int log_level = DEFAULT_LOG_LEVEL;
27 static const int log_class[] = {
28         [L_CRIT] = LOG_CRIT,
29         [L_WARNING] = LOG_WARNING,
30         [L_NOTICE] = LOG_NOTICE,
31         [L_INFO] = LOG_INFO,
32         [L_DEBUG] = LOG_DEBUG
33 };
34
35 #ifdef DUMMY_MODE
36 #define use_syslog false
37 #else
38 static bool use_syslog = true;
39 #endif
40
41
42 static void
43 netifd_delete_process(struct netifd_process *proc)
44 {
45         if (proc->uloop.pending)
46                 uloop_process_delete(&proc->uloop);
47         list_del(&proc->list);
48         netifd_fd_delete(&proc->log_fd);
49 }
50
51 void
52 netifd_log_message(int priority, const char *format, ...)
53 {
54         va_list vl;
55
56         if (priority > log_level)
57                 return;
58
59         va_start(vl, format);
60         if (use_syslog)
61                 vsyslog(log_class[priority], format, vl);
62         else
63                 vfprintf(stderr, format, vl);
64         va_end(vl);
65 }
66
67 static void
68 netifd_process_log_cb(struct uloop_fd *fd, unsigned int events)
69 {
70         struct netifd_process *proc;
71         const char *log_prefix;
72         char *buf, *cur;
73         int maxlen, len, read_len;
74
75         proc = container_of(fd, struct netifd_process, log_uloop);
76
77         if (!proc->log_buf)
78                 proc->log_buf = malloc(LOG_BUF_SIZE + 1);
79
80         buf = proc->log_buf + proc->log_buf_ofs;
81         maxlen = LOG_BUF_SIZE - proc->log_buf_ofs;
82
83         log_prefix = proc->log_prefix;
84         if (!log_prefix)
85                 log_prefix = "process";
86
87 retry:
88         read_len = len = read(fd->fd, buf, maxlen);
89         if (len < 0) {
90                 if (errno == EAGAIN)
91                         goto retry;
92
93                 goto out;
94         } else if (len == 0)
95                 goto out;
96
97         proc->log_buf_ofs += len;
98
99         cur = buf;
100         buf = proc->log_buf;
101         while ((cur = memchr(cur, '\n', len))) {
102                 *cur = 0;
103
104                 if (!proc->log_overflow)
105                         netifd_log_message(L_NOTICE, "%s (%d): %s\n",
106                                 log_prefix, proc->uloop.pid, buf);
107                 else
108                         proc->log_overflow = false;
109
110                 cur++;
111                 len -= cur - buf;
112                 buf = cur;
113         }
114
115         if (buf > proc->log_buf && len > 0)
116                 memmove(buf, proc->log_buf, len);
117
118         if (len == LOG_BUF_SIZE) {
119                 if (!proc->log_overflow) {
120                         proc->log_buf[LOG_BUF_SIZE] = 0;
121                         netifd_log_message(L_NOTICE, "%s (%d): %s [...]\n",
122                                 log_prefix, proc->uloop.pid, proc->log_buf);
123                         proc->log_overflow = true;
124                 }
125                 len = 0;
126         }
127         proc->log_buf_ofs = len;
128
129         if (read_len == maxlen)
130                 goto retry;
131
132 out:
133         if (fd->eof)
134                 uloop_fd_delete(fd);
135 }
136
137 static void
138 netifd_process_cb(struct uloop_process *proc, int ret)
139 {
140         struct netifd_process *np;
141         np = container_of(proc, struct netifd_process, uloop);
142         netifd_process_log_cb(&np->log_uloop, 0);
143         netifd_delete_process(np);
144         return np->cb(np, ret);
145 }
146
147 int
148 netifd_start_process(const char **argv, char **env, struct netifd_process *proc)
149 {
150         struct netifd_fd *fd;
151         int pfds[2];
152         int pid;
153
154         netifd_kill_process(proc);
155
156         if (pipe(pfds) < 0)
157                 return -1;
158
159         if ((pid = fork()) < 0)
160                 goto error;
161
162         if (!pid) {
163                 if (env) {
164                         while (*env) {
165                                 putenv(*env);
166                                 env++;
167                         }
168                 }
169                 if (proc->dir_fd >= 0)
170                         fchdir(proc->dir_fd);
171
172                 /* close all non-essential fds */
173                 list_for_each_entry(fd, &fds, list) {
174                         if (fd->proc == proc)
175                                 continue;
176                         close(fd->fd);
177                 }
178
179                 dup2(pfds[1], 0);
180                 dup2(pfds[1], 1);
181                 dup2(pfds[1], 2);
182
183                 close(pfds[0]);
184                 close(pfds[1]);
185
186                 execvp(argv[0], (char **) argv);
187                 exit(127);
188         }
189
190         if (pid < 0)
191                 goto error;
192
193         close(pfds[1]);
194         proc->uloop.cb = netifd_process_cb;
195         proc->uloop.pid = pid;
196         uloop_process_add(&proc->uloop);
197         list_add_tail(&proc->list, &process_list);
198
199         proc->log_uloop.fd = proc->log_fd.fd = pfds[0];
200         proc->log_uloop.cb = netifd_process_log_cb;
201         netifd_fd_add(&proc->log_fd);
202         uloop_fd_add(&proc->log_uloop, ULOOP_EDGE_TRIGGER | ULOOP_READ);
203
204         return 0;
205
206 error:
207         close(pfds[0]);
208         close(pfds[1]);
209         return -1;
210 }
211
212 void
213 netifd_kill_process(struct netifd_process *proc)
214 {
215         if (!proc->uloop.pending)
216                 return;
217
218         kill(proc->uloop.pid, SIGTERM);
219         netifd_delete_process(proc);
220 }
221
222 void
223 netifd_fd_add(struct netifd_fd *fd)
224 {
225         list_add_tail(&fd->list, &fds);
226 }
227
228 void
229 netifd_fd_delete(struct netifd_fd *fd)
230 {
231         list_del(&fd->list);
232 }
233
234 static void netifd_do_restart(struct uloop_timeout *timeout)
235 {
236         execvp(global_argv[0], global_argv);
237 }
238
239 static void netifd_do_reload(struct uloop_timeout *timeout)
240 {
241         config_init_interfaces(NULL);
242 }
243
244 static struct uloop_timeout main_timer;
245
246 void netifd_reload(void)
247 {
248         main_timer.cb = netifd_do_reload;
249         uloop_timeout_set(&main_timer, 100);
250 }
251
252 void netifd_restart(void)
253 {
254         main_timer.cb = netifd_do_restart;
255         interface_set_down(NULL);
256         uloop_timeout_set(&main_timer, 1000);
257 }
258
259 static int usage(const char *progname)
260 {
261         fprintf(stderr, "Usage: %s [options]\n"
262                 "Options:\n"
263                 " -d <mask>:            Mask for debug messages\n"
264                 " -s <path>:            Path to the ubus socket\n"
265                 " -p <path>:            Path to netifd addons (default: %s)\n"
266                 " -h <path>:            Path to the hotplug script\n"
267                 " -r <path>:            Path to resolv.conf\n"
268                 " -l <level>:           Log output level (default: %d)\n"
269                 " -S:                   Use stderr instead of syslog for log messages\n"
270                 "                       (default: "DEFAULT_HOTPLUG_PATH")\n"
271                 "\n", progname, main_path, DEFAULT_LOG_LEVEL);
272
273         return 1;
274 }
275
276 static void
277 netifd_handle_signal(int signo)
278 {
279         uloop_end();
280 }
281
282 static void
283 netifd_setup_signals(void)
284 {
285         struct sigaction s;
286
287         memset(&s, 0, sizeof(s));
288         s.sa_handler = netifd_handle_signal;
289         s.sa_flags = 0;
290         sigaction(SIGINT, &s, NULL);
291         sigaction(SIGTERM, &s, NULL);
292         sigaction(SIGUSR1, &s, NULL);
293         sigaction(SIGUSR2, &s, NULL);
294
295         s.sa_handler = SIG_IGN;
296         sigaction(SIGPIPE, &s, NULL);
297 }
298
299 static void
300 netifd_kill_processes(void)
301 {
302         struct netifd_process *proc, *tmp;
303
304         list_for_each_entry_safe(proc, tmp, &process_list, list)
305                 netifd_kill_process(proc);
306 }
307
308 int main(int argc, char **argv)
309 {
310         const char *socket = NULL;
311         int ch;
312
313         global_argv = argv;
314
315         while ((ch = getopt(argc, argv, "d:s:p:h:r:l:S")) != -1) {
316                 switch(ch) {
317                 case 'd':
318                         debug_mask = strtoul(optarg, NULL, 0);
319                         break;
320                 case 's':
321                         socket = optarg;
322                         break;
323                 case 'p':
324                         main_path = optarg;
325                         break;
326                 case 'h':
327                         hotplug_cmd_path = optarg;
328                         break;
329                 case 'r':
330                         resolv_conf = optarg;
331                         break;
332                 case 'l':
333                         log_level = atoi(optarg);
334                         if (log_level >= ARRAY_SIZE(log_class))
335                                 log_level = ARRAY_SIZE(log_class) - 1;
336                         break;
337 #ifndef DUMMY_MODE
338                 case 'S':
339                         use_syslog = false;
340                         break;
341 #endif
342                 default:
343                         return usage(argv[0]);
344                 }
345         }
346
347         if (use_syslog)
348                 openlog("netifd", 0, LOG_DAEMON);
349
350         netifd_setup_signals();
351         if (netifd_ubus_init(socket) < 0) {
352                 fprintf(stderr, "Failed to connect to ubus\n");
353                 return 1;
354         }
355
356         if (system_init()) {
357                 fprintf(stderr, "Failed to initialize system control\n");
358                 return 1;
359         }
360
361         config_init_interfaces(NULL);
362
363         uloop_run();
364         netifd_kill_processes();
365
366         netifd_ubus_done();
367
368         if (use_syslog)
369                 closelog();
370
371         return 0;
372 }