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