main.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <getopt.h>
   5 #include <unistd.h>
   6
   7 #include "netifd.h"
   8 #include "ubus.h"
   9 #include "config.h"
  10 #include "system.h"
  11 #include "interface.h"
  12
  13 unsigned int debug_mask = 0;
  14 const char *main_path = DEFAULT_MAIN_PATH;
  15 const char *resolv_conf = DEFAULT_RESOLV_CONF;
  16 static char **global_argv;
  17 static struct list_head process_list = LIST_HEAD_INIT(process_list);
  18
  19 static void
  20 netifd_process_cb(struct uloop_process *proc, int ret)
  21 {
  22         struct netifd_process *np;
  23         np = container_of(proc, struct netifd_process, uloop);
  24         list_del(&np->list);
  25         return np->cb(np, ret);
  26 }
  27
  28 int
  29 netifd_start_process(const char **argv, char **env, int dir_fd, struct netifd_process *proc)
  30 {
  31         int pid;
  32
  33         netifd_kill_process(proc);
  34
  35         if ((pid = fork()) < 0)
  36                 return -1;
  37
  38         if (!pid) {
  39                 if (env) {
  40                         while (*env) {
  41                                 putenv(*env);
  42                                 env++;
  43                         }
  44                 }
  45                 if (dir_fd >= 0)
  46                         fchdir(dir_fd);
  47                 execvp(argv[0], (char **) argv);
  48                 exit(127);
  49         }
  50
  51         if (pid < 0)
  52                 return -1;
  53
  54         proc->uloop.cb = netifd_process_cb;
  55         proc->uloop.pid = pid;
  56         uloop_process_add(&proc->uloop);
  57         list_add_tail(&proc->list, &process_list);
  58
  59         return 0;
  60 }
  61
  62 void
  63 netifd_kill_process(struct netifd_process *proc)
  64 {
  65         if (!proc->uloop.pending)
  66                 return;
  67
  68         kill(proc->uloop.pid, SIGTERM);
  69         uloop_process_delete(&proc->uloop);
  70         list_del(&proc->list);
  71 }
  72
  73 static void netifd_do_restart(struct uloop_timeout *timeout)
  74 {
  75         execvp(global_argv[0], global_argv);
  76 }
  77
  78 static void netifd_do_reload(struct uloop_timeout *timeout)
  79 {
  80         config_init_interfaces(NULL);
  81 }
  82
  83 static struct uloop_timeout main_timer;
  84
  85 void netifd_reload(void)
  86 {
  87         main_timer.cb = netifd_do_reload;
  88         uloop_timeout_set(&main_timer, 100);
  89 }
  90
  91 void netifd_restart(void)
  92 {
  93         main_timer.cb = netifd_do_restart;
  94         interface_set_down(NULL);
  95         uloop_timeout_set(&main_timer, 1000);
  96 }
  97
  98 static int usage(const char *progname)
  99 {
 100         fprintf(stderr, "Usage: %s [options]\n"
 101                 "Options:\n"
 102                 " -d <mask>:            Mask for debug messages\n"
 103                 " -s <path>:            Path to the ubus socket\n"
 104                 " -p <path>:            Path to netifd addons (default: %s)\n"
 105                 " -h <path>:            Path to the hotplug script\n"
 106                 " -r <path>:            Path to resolv.conf\n"
 107                 "                       (default: "DEFAULT_HOTPLUG_PATH")\n"
 108                 "\n", progname, main_path);
 109
 110         return 1;
 111 }
 112
 113 static void
 114 netifd_handle_signal(int signo)
 115 {
 116         uloop_end();
 117 }
 118
 119 static void
 120 netifd_setup_signals(void)
 121 {
 122         struct sigaction s;
 123
 124         memset(&s, 0, sizeof(s));
 125         s.sa_handler = netifd_handle_signal;
 126         s.sa_flags = 0;
 127         sigaction(SIGINT, &s, NULL);
 128         sigaction(SIGTERM, &s, NULL);
 129         sigaction(SIGUSR1, &s, NULL);
 130         sigaction(SIGUSR2, &s, NULL);
 131 }
 132
 133 static void
 134 netifd_kill_processes(void)
 135 {
 136         struct netifd_process *proc, *tmp;
 137
 138         list_for_each_entry_safe(proc, tmp, &process_list, list)
 139                 netifd_kill_process(proc);
 140 }
 141
 142 int main(int argc, char **argv)
 143 {
 144         const char *socket = NULL;
 145         int ch;
 146
 147         global_argv = argv;
 148
 149         while ((ch = getopt(argc, argv, "d:s:p:h:r:")) != -1) {
 150                 switch(ch) {
 151                 case 'd':
 152                         debug_mask = strtoul(optarg, NULL, 0);
 153                         break;
 154                 case 's':
 155                         socket = optarg;
 156                         break;
 157                 case 'p':
 158                         main_path = optarg;
 159                         break;
 160                 case 'h':
 161                         hotplug_cmd_path = optarg;
 162                         break;
 163                 case 'r':
 164                         resolv_conf = optarg;
 165                         break;
 166                 default:
 167                         return usage(argv[0]);
 168                 }
 169         }
 170
 171         netifd_setup_signals();
 172         if (netifd_ubus_init(socket) < 0) {
 173                 fprintf(stderr, "Failed to connect to ubus\n");
 174                 return 1;
 175         }
 176
 177         if (system_init()) {
 178                 fprintf(stderr, "Failed to initialize system control\n");
 179                 return 1;
 180         }
 181
 182         config_init_interfaces(NULL);
 183
 184         uloop_run();
 185         netifd_kill_processes();
 186
 187         netifd_ubus_done();
 188
 189         return 0;
 190 }