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
   8 #include "netifd.h"
   9 #include "ubus.h"
  10 #include "config.h"
  11 #include "system.h"
  12 #include "interface.h"
  13
  14 unsigned int debug_mask = 0;
  15 const char *main_path = DEFAULT_MAIN_PATH;
  16 const char *resolv_conf = DEFAULT_RESOLV_CONF;
  17 static char **global_argv;
  18
  19 static struct list_head process_list = LIST_HEAD_INIT(process_list);
  20 static struct list_head fds = LIST_HEAD_INIT(fds);
  21
  22 static void
  23 netifd_delete_process(struct netifd_process *proc)
  24 {
  25         if (proc->uloop.pending)
  26                 uloop_process_delete(&proc->uloop);
  27         list_del(&proc->list);
  28         netifd_fd_delete(&proc->log_fd);
  29 }
  30
  31 static void
  32 netifd_process_log_cb(struct uloop_fd *fd, unsigned int events)
  33 {
  34         struct netifd_process *proc;
  35         const char *log_prefix;
  36         char *buf, *cur;
  37         int maxlen, len, read_len;
  38
  39         proc = container_of(fd, struct netifd_process, log_uloop);
  40
  41         if (!proc->log_buf)
  42                 proc->log_buf = malloc(LOG_BUF_SIZE + 1);
  43
  44         buf = proc->log_buf + proc->log_buf_ofs;
  45         maxlen = LOG_BUF_SIZE - proc->log_buf_ofs;
  46
  47         log_prefix = proc->log_prefix;
  48         if (!log_prefix)
  49                 log_prefix = "process";
  50
  51 retry:
  52         read_len = len = read(fd->fd, buf, maxlen);
  53         if (len <= 0) {
  54                 if (errno == EINTR)
  55                         goto retry;
  56
  57                 return;
  58         }
  59         proc->log_buf_ofs += len;
  60
  61         cur = buf;
  62         buf = proc->log_buf;
  63         while ((cur = memchr(cur, '\n', len))) {
  64                 *cur = 0;
  65
  66                 if (!proc->log_overflow)
  67                         fprintf(stderr, "%s (%d): %s\n", log_prefix, proc->uloop.pid, buf);
  68                 else
  69                         proc->log_overflow = false;
  70
  71                 cur++;
  72                 len -= cur - buf;
  73                 buf = cur;
  74         }
  75
  76         if (buf > proc->log_buf && len > 0)
  77                 memmove(buf, proc->log_buf, len);
  78
  79         if (len == LOG_BUF_SIZE) {
  80                 if (!proc->log_overflow) {
  81                         proc->log_buf[LOG_BUF_SIZE] = 0;
  82                         fprintf(stderr, "%s (%d): %s [...]\n", log_prefix, proc->uloop.pid, proc->log_buf);
  83                         proc->log_overflow = true;
  84                 }
  85                 len = 0;
  86         }
  87         proc->log_buf_ofs = len;
  88
  89         if (read_len == maxlen)
  90                 goto retry;
  91 }
  92
  93 static void
  94 netifd_process_cb(struct uloop_process *proc, int ret)
  95 {
  96         struct netifd_process *np;
  97         np = container_of(proc, struct netifd_process, uloop);
  98         netifd_process_log_cb(&np->log_uloop, 0);
  99         netifd_delete_process(np);
 100         return np->cb(np, ret);
 101 }
 102
 103 int
 104 netifd_start_process(const char **argv, char **env, struct netifd_process *proc)
 105 {
 106         struct netifd_fd *fd;
 107         int pfds[2];
 108         int pid;
 109
 110         netifd_kill_process(proc);
 111
 112         if (pipe(pfds) < 0)
 113                 return -1;
 114
 115         if ((pid = fork()) < 0)
 116                 goto error;
 117
 118         if (!pid) {
 119                 if (env) {
 120                         while (*env) {
 121                                 putenv(*env);
 122                                 env++;
 123                         }
 124                 }
 125                 if (proc->dir_fd >= 0)
 126                         fchdir(proc->dir_fd);
 127
 128                 /* close all non-essential fds */
 129                 list_for_each_entry(fd, &fds, list) {
 130                         if (fd->proc == proc)
 131                                 continue;
 132                         close(fd->fd);
 133                 }
 134
 135                 dup2(pfds[1], 0);
 136                 dup2(pfds[1], 1);
 137                 dup2(pfds[1], 2);
 138
 139                 close(pfds[0]);
 140                 close(pfds[1]);
 141
 142                 execvp(argv[0], (char **) argv);
 143                 exit(127);
 144         }
 145
 146         if (pid < 0)
 147                 goto error;
 148
 149         close(pfds[1]);
 150         proc->uloop.cb = netifd_process_cb;
 151         proc->uloop.pid = pid;
 152         uloop_process_add(&proc->uloop);
 153         list_add_tail(&proc->list, &process_list);
 154
 155         proc->log_uloop.fd = proc->log_fd.fd = pfds[0];
 156         proc->log_uloop.cb = netifd_process_log_cb;
 157         netifd_fd_add(&proc->log_fd);
 158         uloop_fd_add(&proc->log_uloop, ULOOP_EDGE_TRIGGER | ULOOP_READ);
 159
 160         return 0;
 161
 162 error:
 163         close(pfds[0]);
 164         close(pfds[1]);
 165         return -1;
 166 }
 167
 168 void
 169 netifd_kill_process(struct netifd_process *proc)
 170 {
 171         if (!proc->uloop.pending)
 172                 return;
 173
 174         kill(proc->uloop.pid, SIGTERM);
 175         netifd_delete_process(proc);
 176 }
 177
 178 void
 179 netifd_fd_add(struct netifd_fd *fd)
 180 {
 181         list_add_tail(&fd->list, &fds);
 182 }
 183
 184 void
 185 netifd_fd_delete(struct netifd_fd *fd)
 186 {
 187         list_del(&fd->list);
 188 }
 189
 190 static void netifd_do_restart(struct uloop_timeout *timeout)
 191 {
 192         execvp(global_argv[0], global_argv);
 193 }
 194
 195 static void netifd_do_reload(struct uloop_timeout *timeout)
 196 {
 197         config_init_interfaces(NULL);
 198 }
 199
 200 static struct uloop_timeout main_timer;
 201
 202 void netifd_reload(void)
 203 {
 204         main_timer.cb = netifd_do_reload;
 205         uloop_timeout_set(&main_timer, 100);
 206 }
 207
 208 void netifd_restart(void)
 209 {
 210         main_timer.cb = netifd_do_restart;
 211         interface_set_down(NULL);
 212         uloop_timeout_set(&main_timer, 1000);
 213 }
 214
 215 static int usage(const char *progname)
 216 {
 217         fprintf(stderr, "Usage: %s [options]\n"
 218                 "Options:\n"
 219                 " -d <mask>:            Mask for debug messages\n"
 220                 " -s <path>:            Path to the ubus socket\n"
 221                 " -p <path>:            Path to netifd addons (default: %s)\n"
 222                 " -h <path>:            Path to the hotplug script\n"
 223                 " -r <path>:            Path to resolv.conf\n"
 224                 "                       (default: "DEFAULT_HOTPLUG_PATH")\n"
 225                 "\n", progname, main_path);
 226
 227         return 1;
 228 }
 229
 230 static void
 231 netifd_handle_signal(int signo)
 232 {
 233         uloop_end();
 234 }
 235
 236 static void
 237 netifd_setup_signals(void)
 238 {
 239         struct sigaction s;
 240
 241         memset(&s, 0, sizeof(s));
 242         s.sa_handler = netifd_handle_signal;
 243         s.sa_flags = 0;
 244         sigaction(SIGINT, &s, NULL);
 245         sigaction(SIGTERM, &s, NULL);
 246         sigaction(SIGUSR1, &s, NULL);
 247         sigaction(SIGUSR2, &s, NULL);
 248
 249         s.sa_handler = SIG_IGN;
 250         sigaction(SIGPIPE, &s, NULL);
 251 }
 252
 253 static void
 254 netifd_kill_processes(void)
 255 {
 256         struct netifd_process *proc, *tmp;
 257
 258         list_for_each_entry_safe(proc, tmp, &process_list, list)
 259                 netifd_kill_process(proc);
 260 }
 261
 262 int main(int argc, char **argv)
 263 {
 264         const char *socket = NULL;
 265         int ch;
 266
 267         global_argv = argv;
 268
 269         while ((ch = getopt(argc, argv, "d:s:p:h:r:")) != -1) {
 270                 switch(ch) {
 271                 case 'd':
 272                         debug_mask = strtoul(optarg, NULL, 0);
 273                         break;
 274                 case 's':
 275                         socket = optarg;
 276                         break;
 277                 case 'p':
 278                         main_path = optarg;
 279                         break;
 280                 case 'h':
 281                         hotplug_cmd_path = optarg;
 282                         break;
 283                 case 'r':
 284                         resolv_conf = optarg;
 285                         break;
 286                 default:
 287                         return usage(argv[0]);
 288                 }
 289         }
 290
 291         netifd_setup_signals();
 292         if (netifd_ubus_init(socket) < 0) {
 293                 fprintf(stderr, "Failed to connect to ubus\n");
 294                 return 1;
 295         }
 296
 297         if (system_init()) {
 298                 fprintf(stderr, "Failed to initialize system control\n");
 299                 return 1;
 300         }
 301
 302         config_init_interfaces(NULL);
 303
 304         uloop_run();
 305         netifd_kill_processes();
 306
 307         netifd_ubus_done();
 308
 309         return 0;
 310 }