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 int netifd_reload(void)
 212 {
 213         return 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 }