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 static struct list_head fds = LIST_HEAD_INIT(fds);
  36
  37 #define DEFAULT_LOG_LEVEL L_NOTICE
  38
  39 static int log_level = DEFAULT_LOG_LEVEL;
  40 static const int log_class[] = {
  41         [L_CRIT] = LOG_CRIT,
  42         [L_WARNING] = LOG_WARNING,
  43         [L_NOTICE] = LOG_NOTICE,
  44         [L_INFO] = LOG_INFO,
  45         [L_DEBUG] = LOG_DEBUG
  46 };
  47
  48 #ifdef DUMMY_MODE
  49 #define use_syslog false
  50 #else
  51 static bool use_syslog = true;
  52 #endif
  53
  54
  55 static void
  56 netifd_delete_process(struct netifd_process *proc)
  57 {
  58         if (proc->uloop.pending)
  59                 uloop_process_delete(&proc->uloop);
  60         list_del(&proc->list);
  61         netifd_fd_delete(&proc->log_fd);
  62         if (proc->log_buf) {
  63                 free(proc->log_buf);
  64                 proc->log_buf = NULL;
  65         }
  66 }
  67
  68 void
  69 netifd_log_message(int priority, const char *format, ...)
  70 {
  71         va_list vl;
  72
  73         if (priority > log_level)
  74                 return;
  75
  76         va_start(vl, format);
  77         if (use_syslog)
  78                 vsyslog(log_class[priority], format, vl);
  79         else
  80                 vfprintf(stderr, format, vl);
  81         va_end(vl);
  82 }
  83
  84 static void
  85 netifd_process_log_cb(struct uloop_fd *fd, unsigned int events)
  86 {
  87         struct netifd_process *proc;
  88         const char *log_prefix;
  89         char *buf, *cur;
  90         int maxlen, len, read_len;
  91
  92         proc = container_of(fd, struct netifd_process, log_uloop);
  93
  94         if (!proc->log_buf)
  95                 proc->log_buf = malloc(LOG_BUF_SIZE + 1);
  96
  97         log_prefix = proc->log_prefix;
  98         if (!log_prefix)
  99                 log_prefix = "process";
 100
 101 retry:
 102         buf = proc->log_buf + proc->log_buf_ofs;
 103         maxlen = LOG_BUF_SIZE - proc->log_buf_ofs;
 104         read_len = len = read(fd->fd, buf, maxlen);
 105         if (len < 0) {
 106                 if (errno == EINTR)
 107                         goto retry;
 108
 109                 goto out;
 110         } else if (len == 0)
 111                 goto out;
 112
 113         proc->log_buf_ofs += len;
 114
 115         len = proc->log_buf_ofs;
 116         buf = proc->log_buf;
 117         while (len > 0) {
 118                 cur = memchr(buf, '\n', len);
 119                 if (!cur)
 120                         break;
 121
 122                 *cur = 0;
 123
 124                 if (!proc->log_overflow)
 125                         netifd_log_message(L_NOTICE, "%s (%d): %s\n",
 126                                 log_prefix, proc->uloop.pid, buf);
 127                 else
 128                         proc->log_overflow = false;
 129
 130                 cur++;
 131                 len -= cur - buf;
 132                 buf = cur;
 133         }
 134
 135         if (buf > proc->log_buf && len > 0)
 136                 memmove(proc->log_buf, buf, len);
 137
 138         if (len == LOG_BUF_SIZE) {
 139                 if (!proc->log_overflow) {
 140                         proc->log_buf[LOG_BUF_SIZE] = 0;
 141                         netifd_log_message(L_NOTICE, "%s (%d): %s [...]\n",
 142                                 log_prefix, proc->uloop.pid, proc->log_buf);
 143                         proc->log_overflow = true;
 144                 }
 145                 len = 0;
 146         }
 147         proc->log_buf_ofs = len;
 148
 149         if (read_len > 0)
 150                 goto retry;
 151
 152 out:
 153         if (fd->eof)
 154                 uloop_fd_delete(fd);
 155 }
 156
 157 static void
 158 netifd_process_cb(struct uloop_process *proc, int ret)
 159 {
 160         struct netifd_process *np;
 161         np = container_of(proc, struct netifd_process, uloop);
 162         netifd_process_log_cb(&np->log_uloop, 0);
 163         netifd_delete_process(np);
 164         return np->cb(np, ret);
 165 }
 166
 167 int
 168 netifd_start_process(const char **argv, char **env, struct netifd_process *proc)
 169 {
 170         struct netifd_fd *fd;
 171         int pfds[2];
 172         int pid;
 173
 174         netifd_kill_process(proc);
 175
 176         if (pipe(pfds) < 0)
 177                 return -1;
 178
 179         if ((pid = fork()) < 0)
 180                 goto error;
 181
 182         if (!pid) {
 183                 if (env) {
 184                         while (*env) {
 185                                 putenv(*env);
 186                                 env++;
 187                         }
 188                 }
 189                 if (proc->dir_fd >= 0)
 190                         fchdir(proc->dir_fd);
 191
 192                 /* close all non-essential fds */
 193                 list_for_each_entry(fd, &fds, list) {
 194                         if (fd->proc == proc)
 195                                 continue;
 196                         close(fd->fd);
 197                 }
 198
 199                 dup2(pfds[1], 0);
 200                 dup2(pfds[1], 1);
 201                 dup2(pfds[1], 2);
 202
 203                 close(pfds[0]);
 204                 close(pfds[1]);
 205
 206                 execvp(argv[0], (char **) argv);
 207                 exit(127);
 208         }
 209
 210         if (pid < 0)
 211                 goto error;
 212
 213         close(pfds[1]);
 214         proc->uloop.cb = netifd_process_cb;
 215         proc->uloop.pid = pid;
 216         uloop_process_add(&proc->uloop);
 217         list_add_tail(&proc->list, &process_list);
 218
 219         proc->log_buf_ofs = 0;
 220         proc->log_uloop.fd = proc->log_fd.fd = pfds[0];
 221         proc->log_uloop.cb = netifd_process_log_cb;
 222         netifd_fd_add(&proc->log_fd);
 223         uloop_fd_add(&proc->log_uloop, ULOOP_EDGE_TRIGGER | ULOOP_READ);
 224
 225         return 0;
 226
 227 error:
 228         close(pfds[0]);
 229         close(pfds[1]);
 230         return -1;
 231 }
 232
 233 void
 234 netifd_kill_process(struct netifd_process *proc)
 235 {
 236         if (!proc->uloop.pending)
 237                 return;
 238
 239         kill(proc->uloop.pid, SIGKILL);
 240         netifd_delete_process(proc);
 241 }
 242
 243 void
 244 netifd_fd_add(struct netifd_fd *fd)
 245 {
 246         list_add_tail(&fd->list, &fds);
 247 }
 248
 249 void
 250 netifd_fd_delete(struct netifd_fd *fd)
 251 {
 252         list_del(&fd->list);
 253 }
 254
 255 static void netifd_do_restart(struct uloop_timeout *timeout)
 256 {
 257         execvp(global_argv[0], global_argv);
 258 }
 259
 260 static void netifd_do_reload(struct uloop_timeout *timeout)
 261 {
 262         config_init_all();
 263 }
 264
 265 static struct uloop_timeout main_timer;
 266
 267 void netifd_reload(void)
 268 {
 269         main_timer.cb = netifd_do_reload;
 270         uloop_timeout_set(&main_timer, 100);
 271 }
 272
 273 void netifd_restart(void)
 274 {
 275         main_timer.cb = netifd_do_restart;
 276         interface_set_down(NULL);
 277         uloop_timeout_set(&main_timer, 1000);
 278 }
 279
 280 static int usage(const char *progname)
 281 {
 282         fprintf(stderr, "Usage: %s [options]\n"
 283                 "Options:\n"
 284                 " -d <mask>:            Mask for debug messages\n"
 285                 " -s <path>:            Path to the ubus socket\n"
 286                 " -p <path>:            Path to netifd addons (default: %s)\n"
 287                 " -h <path>:            Path to the hotplug script\n"
 288                 " -r <path>:            Path to resolv.conf\n"
 289                 " -l <level>:           Log output level (default: %d)\n"
 290                 " -S:                   Use stderr instead of syslog for log messages\n"
 291                 "                       (default: "DEFAULT_HOTPLUG_PATH")\n"
 292                 "\n", progname, main_path, DEFAULT_LOG_LEVEL);
 293
 294         return 1;
 295 }
 296
 297 static void
 298 netifd_handle_signal(int signo)
 299 {
 300         uloop_end();
 301 }
 302
 303 static void
 304 netifd_setup_signals(void)
 305 {
 306         struct sigaction s;
 307
 308         memset(&s, 0, sizeof(s));
 309         s.sa_handler = netifd_handle_signal;
 310         s.sa_flags = 0;
 311         sigaction(SIGINT, &s, NULL);
 312         sigaction(SIGTERM, &s, NULL);
 313         sigaction(SIGUSR1, &s, NULL);
 314         sigaction(SIGUSR2, &s, NULL);
 315
 316         s.sa_handler = SIG_IGN;
 317         sigaction(SIGPIPE, &s, NULL);
 318 }
 319
 320 static void
 321 netifd_kill_processes(void)
 322 {
 323         struct netifd_process *proc, *tmp;
 324
 325         list_for_each_entry_safe(proc, tmp, &process_list, list)
 326                 netifd_kill_process(proc);
 327 }
 328
 329 int main(int argc, char **argv)
 330 {
 331         const char *socket = NULL;
 332         int ch;
 333
 334         global_argv = argv;
 335
 336         while ((ch = getopt(argc, argv, "d:s:p:h:r:l:S")) != -1) {
 337                 switch(ch) {
 338                 case 'd':
 339                         debug_mask = strtoul(optarg, NULL, 0);
 340                         break;
 341                 case 's':
 342                         socket = optarg;
 343                         break;
 344                 case 'p':
 345                         main_path = optarg;
 346                         break;
 347                 case 'h':
 348                         hotplug_cmd_path = optarg;
 349                         break;
 350                 case 'r':
 351                         resolv_conf = optarg;
 352                         break;
 353                 case 'l':
 354                         log_level = atoi(optarg);
 355                         if (log_level >= ARRAY_SIZE(log_class))
 356                                 log_level = ARRAY_SIZE(log_class) - 1;
 357                         break;
 358 #ifndef DUMMY_MODE
 359                 case 'S':
 360                         use_syslog = false;
 361                         break;
 362 #endif
 363                 default:
 364                         return usage(argv[0]);
 365                 }
 366         }
 367
 368         if (use_syslog)
 369                 openlog("netifd", 0, LOG_DAEMON);
 370
 371         netifd_setup_signals();
 372         if (netifd_ubus_init(socket) < 0) {
 373                 fprintf(stderr, "Failed to connect to ubus\n");
 374                 return 1;
 375         }
 376
 377         if (system_init()) {
 378                 fprintf(stderr, "Failed to initialize system control\n");
 379                 return 1;
 380         }
 381
 382         config_init_all();
 383
 384         uloop_run();
 385         netifd_kill_processes();
 386
 387         netifd_ubus_done();
 388
 389         if (use_syslog)
 390                 closelog();
 391
 392         return 0;
 393 }