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 }