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

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