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