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