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