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                 goto out;
 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 out:
 139         if (fd->eof)
 140                 uloop_fd_delete(fd);
 141 }
 142
 143 static void
 144 netifd_process_cb(struct uloop_process *proc, int ret)
 145 {
 146         struct netifd_process *np;
 147         np = container_of(proc, struct netifd_process, uloop);
 148         netifd_process_log_cb(&np->log_uloop, 0);
 149         netifd_delete_process(np);
 150         return np->cb(np, ret);
 151 }
 152
 153 int
 154 netifd_start_process(const char **argv, char **env, struct netifd_process *proc)
 155 {
 156         struct netifd_fd *fd;
 157         int pfds[2];
 158         int pid;
 159
 160         netifd_kill_process(proc);
 161
 162         if (pipe(pfds) < 0)
 163                 return -1;
 164
 165         if ((pid = fork()) < 0)
 166                 goto error;
 167
 168         if (!pid) {
 169                 if (env) {
 170                         while (*env) {
 171                                 putenv(*env);
 172                                 env++;
 173                         }
 174                 }
 175                 if (proc->dir_fd >= 0)
 176                         fchdir(proc->dir_fd);
 177
 178                 /* close all non-essential fds */
 179                 list_for_each_entry(fd, &fds, list) {
 180                         if (fd->proc == proc)
 181                                 continue;
 182                         close(fd->fd);
 183                 }
 184
 185                 dup2(pfds[1], 0);
 186                 dup2(pfds[1], 1);
 187                 dup2(pfds[1], 2);
 188
 189                 close(pfds[0]);
 190                 close(pfds[1]);
 191
 192                 execvp(argv[0], (char **) argv);
 193                 exit(127);
 194         }
 195
 196         if (pid < 0)
 197                 goto error;
 198
 199         close(pfds[1]);
 200         proc->uloop.cb = netifd_process_cb;
 201         proc->uloop.pid = pid;
 202         uloop_process_add(&proc->uloop);
 203         list_add_tail(&proc->list, &process_list);
 204
 205         proc->log_uloop.fd = proc->log_fd.fd = pfds[0];
 206         proc->log_uloop.cb = netifd_process_log_cb;
 207         netifd_fd_add(&proc->log_fd);
 208         uloop_fd_add(&proc->log_uloop, ULOOP_EDGE_TRIGGER | ULOOP_READ);
 209
 210         return 0;
 211
 212 error:
 213         close(pfds[0]);
 214         close(pfds[1]);
 215         return -1;
 216 }
 217
 218 void
 219 netifd_kill_process(struct netifd_process *proc)
 220 {
 221         if (!proc->uloop.pending)
 222                 return;
 223
 224         kill(proc->uloop.pid, SIGTERM);
 225         netifd_delete_process(proc);
 226 }
 227
 228 void
 229 netifd_fd_add(struct netifd_fd *fd)
 230 {
 231         list_add_tail(&fd->list, &fds);
 232 }
 233
 234 void
 235 netifd_fd_delete(struct netifd_fd *fd)
 236 {
 237         list_del(&fd->list);
 238 }
 239
 240 static void netifd_do_restart(struct uloop_timeout *timeout)
 241 {
 242         execvp(global_argv[0], global_argv);
 243 }
 244
 245 static void netifd_do_reload(struct uloop_timeout *timeout)
 246 {
 247         config_init_interfaces(NULL);
 248 }
 249
 250 static struct uloop_timeout main_timer;
 251
 252 void netifd_reload(void)
 253 {
 254         main_timer.cb = netifd_do_reload;
 255         uloop_timeout_set(&main_timer, 100);
 256 }
 257
 258 void netifd_restart(void)
 259 {
 260         main_timer.cb = netifd_do_restart;
 261         interface_set_down(NULL);
 262         uloop_timeout_set(&main_timer, 1000);
 263 }
 264
 265 static int usage(const char *progname)
 266 {
 267         fprintf(stderr, "Usage: %s [options]\n"
 268                 "Options:\n"
 269                 " -d <mask>:            Mask for debug messages\n"
 270                 " -s <path>:            Path to the ubus socket\n"
 271                 " -p <path>:            Path to netifd addons (default: %s)\n"
 272                 " -h <path>:            Path to the hotplug script\n"
 273                 " -r <path>:            Path to resolv.conf\n"
 274                 " -l <level>:           Log output level (default: %d)\n"
 275                 " -S:                   Use stderr instead of syslog for log messages\n"
 276                 "                       (default: "DEFAULT_HOTPLUG_PATH")\n"
 277                 "\n", progname, main_path, DEFAULT_LOG_LEVEL);
 278
 279         return 1;
 280 }
 281
 282 static void
 283 netifd_handle_signal(int signo)
 284 {
 285         uloop_end();
 286 }
 287
 288 static void
 289 netifd_setup_signals(void)
 290 {
 291         struct sigaction s;
 292
 293         memset(&s, 0, sizeof(s));
 294         s.sa_handler = netifd_handle_signal;
 295         s.sa_flags = 0;
 296         sigaction(SIGINT, &s, NULL);
 297         sigaction(SIGTERM, &s, NULL);
 298         sigaction(SIGUSR1, &s, NULL);
 299         sigaction(SIGUSR2, &s, NULL);
 300
 301         s.sa_handler = SIG_IGN;
 302         sigaction(SIGPIPE, &s, NULL);
 303 }
 304
 305 static void
 306 netifd_kill_processes(void)
 307 {
 308         struct netifd_process *proc, *tmp;
 309
 310         list_for_each_entry_safe(proc, tmp, &process_list, list)
 311                 netifd_kill_process(proc);
 312 }
 313
 314 int main(int argc, char **argv)
 315 {
 316         const char *socket = NULL;
 317         int ch;
 318
 319         global_argv = argv;
 320
 321         while ((ch = getopt(argc, argv, "d:s:p:h:r:l:S")) != -1) {
 322                 switch(ch) {
 323                 case 'd':
 324                         debug_mask = strtoul(optarg, NULL, 0);
 325                         break;
 326                 case 's':
 327                         socket = optarg;
 328                         break;
 329                 case 'p':
 330                         main_path = optarg;
 331                         break;
 332                 case 'h':
 333                         hotplug_cmd_path = optarg;
 334                         break;
 335                 case 'r':
 336                         resolv_conf = optarg;
 337                         break;
 338                 case 'l':
 339                         log_level = atoi(optarg);
 340                         if (log_level >= ARRAY_SIZE(log_class))
 341                                 log_level = ARRAY_SIZE(log_class) - 1;
 342                         break;
 343 #ifndef DUMMY_MODE
 344                 case 'S':
 345                         use_syslog = false;
 346                         break;
 347 #endif
 348                 default:
 349                         return usage(argv[0]);
 350                 }
 351         }
 352
 353         if (use_syslog)
 354                 openlog("netifd", 0, LOG_DAEMON);
 355
 356         netifd_setup_signals();
 357         if (netifd_ubus_init(socket) < 0) {
 358                 fprintf(stderr, "Failed to connect to ubus\n");
 359                 return 1;
 360         }
 361
 362         if (system_init()) {
 363                 fprintf(stderr, "Failed to initialize system control\n");
 364                 return 1;
 365         }
 366
 367         config_init_interfaces(NULL);
 368
 369         uloop_run();
 370         netifd_kill_processes();
 371
 372         netifd_ubus_done();
 373
 374         if (use_syslog)
 375                 closelog();
 376
 377         return 0;
 378 }