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