main.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <getopt.h>
   5 #include <unistd.h>
   6 #include <signal.h>
   7 #include <stdarg.h>
   8 #include <syslog.h>
   9
  10 #include "netifd.h"
  11 #include "ubus.h"
  12 #include "config.h"
  13 #include "system.h"
  14 #include "interface.h"
  15
  16 unsigned int debug_mask = 0;
  17 const char *main_path = DEFAULT_MAIN_PATH;
  18 const char *resolv_conf = DEFAULT_RESOLV_CONF;
  19 static char **global_argv;
  20
  21 static struct list_head process_list = LIST_HEAD_INIT(process_list);
  22 static struct list_head fds = LIST_HEAD_INIT(fds);
  23
  24 #define DEFAULT_LOG_LEVEL L_NOTICE
  25
  26 enum {
  27         L_CRIT,
  28         L_WARNING,
  29         L_NOTICE,
  30         L_INFO,
  31         L_DEBUG
  32 };
  33
  34 static int log_level = DEFAULT_LOG_LEVEL;
  35 static const int log_class[] = {
  36         [L_CRIT] = LOG_CRIT,
  37         [L_WARNING] = LOG_WARNING,
  38         [L_NOTICE] = LOG_NOTICE,
  39         [L_INFO] = LOG_INFO,
  40         [L_DEBUG] = LOG_DEBUG
  41 };
  42
  43 #ifdef DUMMY_MODE
  44 #define use_syslog false
  45 #else
  46 static bool use_syslog = true;
  47 #endif
  48
  49
  50 static void
  51 netifd_delete_process(struct netifd_process *proc)
  52 {
  53         if (proc->uloop.pending)
  54                 uloop_process_delete(&proc->uloop);
  55         list_del(&proc->list);
  56         netifd_fd_delete(&proc->log_fd);
  57 }
  58
  59 void
  60 netifd_log_message(int priority, const char *format, ...)
  61 {
  62         va_list vl;
  63
  64         if (priority > log_level)
  65                 return;
  66
  67         va_start(vl, format);
  68         if (use_syslog)
  69                 vsyslog(log_class[priority], format, vl);
  70         else
  71                 vfprintf(stderr, format, vl);
  72         va_end(vl);
  73 }
  74
  75 static void
  76 netifd_process_log_cb(struct uloop_fd *fd, unsigned int events)
  77 {
  78         struct netifd_process *proc;
  79         const char *log_prefix;
  80         char *buf, *cur;
  81         int maxlen, len, read_len;
  82
  83         proc = container_of(fd, struct netifd_process, log_uloop);
  84
  85         if (!proc->log_buf)
  86                 proc->log_buf = malloc(LOG_BUF_SIZE + 1);
  87
  88         buf = proc->log_buf + proc->log_buf_ofs;
  89         maxlen = LOG_BUF_SIZE - proc->log_buf_ofs;
  90
  91         log_prefix = proc->log_prefix;
  92         if (!log_prefix)
  93                 log_prefix = "process";
  94
  95 retry:
  96         read_len = len = read(fd->fd, buf, maxlen);
  97         if (len < 0) {
  98                 if (errno == EAGAIN)
  99                         goto retry;
 100
 101                 goto out;
 102         } else if (len == 0)
 103                 goto out;
 104
 105         proc->log_buf_ofs += len;
 106
 107         cur = buf;
 108         buf = proc->log_buf;
 109         while ((cur = memchr(cur, '\n', len))) {
 110                 *cur = 0;
 111
 112                 if (!proc->log_overflow)
 113                         netifd_log_message(L_NOTICE, "%s (%d): %s\n",
 114                                 log_prefix, proc->uloop.pid, buf);
 115                 else
 116                         proc->log_overflow = false;
 117
 118                 cur++;
 119                 len -= cur - buf;
 120                 buf = cur;
 121         }
 122
 123         if (buf > proc->log_buf && len > 0)
 124                 memmove(buf, proc->log_buf, len);
 125
 126         if (len == LOG_BUF_SIZE) {
 127                 if (!proc->log_overflow) {
 128                         proc->log_buf[LOG_BUF_SIZE] = 0;
 129                         netifd_log_message(L_NOTICE, "%s (%d): %s [...]\n",
 130                                 log_prefix, proc->uloop.pid, proc->log_buf);
 131                         proc->log_overflow = true;
 132                 }
 133                 len = 0;
 134         }
 135         proc->log_buf_ofs = len;
 136
 137         if (read_len == maxlen)
 138                 goto retry;
 139
 140 out:
 141         if (fd->eof)
 142                 uloop_fd_delete(fd);
 143 }
 144
 145 static void
 146 netifd_process_cb(struct uloop_process *proc, int ret)
 147 {
 148         struct netifd_process *np;
 149         np = container_of(proc, struct netifd_process, uloop);
 150         netifd_process_log_cb(&np->log_uloop, 0);
 151         netifd_delete_process(np);
 152         return np->cb(np, ret);
 153 }
 154
 155 int
 156 netifd_start_process(const char **argv, char **env, struct netifd_process *proc)
 157 {
 158         struct netifd_fd *fd;
 159         int pfds[2];
 160         int pid;
 161
 162         netifd_kill_process(proc);
 163
 164         if (pipe(pfds) < 0)
 165                 return -1;
 166
 167         if ((pid = fork()) < 0)
 168                 goto error;
 169
 170         if (!pid) {
 171                 if (env) {
 172                         while (*env) {
 173                                 putenv(*env);
 174                                 env++;
 175                         }
 176                 }
 177                 if (proc->dir_fd >= 0)
 178                         fchdir(proc->dir_fd);
 179
 180                 /* close all non-essential fds */
 181                 list_for_each_entry(fd, &fds, list) {
 182                         if (fd->proc == proc)
 183                                 continue;
 184                         close(fd->fd);
 185                 }
 186
 187                 dup2(pfds[1], 0);
 188                 dup2(pfds[1], 1);
 189                 dup2(pfds[1], 2);
 190
 191                 close(pfds[0]);
 192                 close(pfds[1]);
 193
 194                 execvp(argv[0], (char **) argv);
 195                 exit(127);
 196         }
 197
 198         if (pid < 0)
 199                 goto error;
 200
 201         close(pfds[1]);
 202         proc->uloop.cb = netifd_process_cb;
 203         proc->uloop.pid = pid;
 204         uloop_process_add(&proc->uloop);
 205         list_add_tail(&proc->list, &process_list);
 206
 207         proc->log_uloop.fd = proc->log_fd.fd = pfds[0];
 208         proc->log_uloop.cb = netifd_process_log_cb;
 209         netifd_fd_add(&proc->log_fd);
 210         uloop_fd_add(&proc->log_uloop, ULOOP_EDGE_TRIGGER | ULOOP_READ);
 211
 212         return 0;
 213
 214 error:
 215         close(pfds[0]);
 216         close(pfds[1]);
 217         return -1;
 218 }
 219
 220 void
 221 netifd_kill_process(struct netifd_process *proc)
 222 {
 223         if (!proc->uloop.pending)
 224                 return;
 225
 226         kill(proc->uloop.pid, SIGTERM);
 227         netifd_delete_process(proc);
 228 }
 229
 230 void
 231 netifd_fd_add(struct netifd_fd *fd)
 232 {
 233         list_add_tail(&fd->list, &fds);
 234 }
 235
 236 void
 237 netifd_fd_delete(struct netifd_fd *fd)
 238 {
 239         list_del(&fd->list);
 240 }
 241
 242 static void netifd_do_restart(struct uloop_timeout *timeout)
 243 {
 244         execvp(global_argv[0], global_argv);
 245 }
 246
 247 static void netifd_do_reload(struct uloop_timeout *timeout)
 248 {
 249         config_init_interfaces(NULL);
 250 }
 251
 252 static struct uloop_timeout main_timer;
 253
 254 void netifd_reload(void)
 255 {
 256         main_timer.cb = netifd_do_reload;
 257         uloop_timeout_set(&main_timer, 100);
 258 }
 259
 260 void netifd_restart(void)
 261 {
 262         main_timer.cb = netifd_do_restart;
 263         interface_set_down(NULL);
 264         uloop_timeout_set(&main_timer, 1000);
 265 }
 266
 267 static int usage(const char *progname)
 268 {
 269         fprintf(stderr, "Usage: %s [options]\n"
 270                 "Options:\n"
 271                 " -d <mask>:            Mask for debug messages\n"
 272                 " -s <path>:            Path to the ubus socket\n"
 273                 " -p <path>:            Path to netifd addons (default: %s)\n"
 274                 " -h <path>:            Path to the hotplug script\n"
 275                 " -r <path>:            Path to resolv.conf\n"
 276                 " -l <level>:           Log output level (default: %d)\n"
 277                 " -S:                   Use stderr instead of syslog for log messages\n"
 278                 "                       (default: "DEFAULT_HOTPLUG_PATH")\n"
 279                 "\n", progname, main_path, DEFAULT_LOG_LEVEL);
 280
 281         return 1;
 282 }
 283
 284 static void
 285 netifd_handle_signal(int signo)
 286 {
 287         uloop_end();
 288 }
 289
 290 static void
 291 netifd_setup_signals(void)
 292 {
 293         struct sigaction s;
 294
 295         memset(&s, 0, sizeof(s));
 296         s.sa_handler = netifd_handle_signal;
 297         s.sa_flags = 0;
 298         sigaction(SIGINT, &s, NULL);
 299         sigaction(SIGTERM, &s, NULL);
 300         sigaction(SIGUSR1, &s, NULL);
 301         sigaction(SIGUSR2, &s, NULL);
 302
 303         s.sa_handler = SIG_IGN;
 304         sigaction(SIGPIPE, &s, NULL);
 305 }
 306
 307 static void
 308 netifd_kill_processes(void)
 309 {
 310         struct netifd_process *proc, *tmp;
 311
 312         list_for_each_entry_safe(proc, tmp, &process_list, list)
 313                 netifd_kill_process(proc);
 314 }
 315
 316 int main(int argc, char **argv)
 317 {
 318         const char *socket = NULL;
 319         int ch;
 320
 321         global_argv = argv;
 322
 323         while ((ch = getopt(argc, argv, "d:s:p:h:r:l:S")) != -1) {
 324                 switch(ch) {
 325                 case 'd':
 326                         debug_mask = strtoul(optarg, NULL, 0);
 327                         break;
 328                 case 's':
 329                         socket = optarg;
 330                         break;
 331                 case 'p':
 332                         main_path = optarg;
 333                         break;
 334                 case 'h':
 335                         hotplug_cmd_path = optarg;
 336                         break;
 337                 case 'r':
 338                         resolv_conf = optarg;
 339                         break;
 340                 case 'l':
 341                         log_level = atoi(optarg);
 342                         if (log_level >= ARRAY_SIZE(log_class))
 343                                 log_level = ARRAY_SIZE(log_class) - 1;
 344                         break;
 345 #ifndef DUMMY_MODE
 346                 case 'S':
 347                         use_syslog = false;
 348                         break;
 349 #endif
 350                 default:
 351                         return usage(argv[0]);
 352                 }
 353         }
 354
 355         if (use_syslog)
 356                 openlog("netifd", 0, LOG_DAEMON);
 357
 358         netifd_setup_signals();
 359         if (netifd_ubus_init(socket) < 0) {
 360                 fprintf(stderr, "Failed to connect to ubus\n");
 361                 return 1;
 362         }
 363
 364         if (system_init()) {
 365                 fprintf(stderr, "Failed to initialize system control\n");
 366                 return 1;
 367         }
 368
 369         config_init_interfaces(NULL);
 370
 371         uloop_run();
 372         netifd_kill_processes();
 373
 374         netifd_ubus_done();
 375
 376         if (use_syslog)
 377                 closelog();
 378
 379         return 0;
 380 }