release/src-rt-6.x.4708/router/rc/arpbind.c

   1 #include "rc.h"
   2
   3 void start_arpbind(void) {
   4
   5         char *nvp, *nv, *b;
   6         const char *ipaddr, *macaddr;
   7         const char *name, *bind;
   8
   9         nvp = nv = strdup(nvram_safe_get("dhcpd_static"));
  10         if (!nv) return;
  11
  12 // clear arp table first
  13         stop_arpbind();
  14
  15         while ((b = strsep(&nvp, ">")) != NULL) {
  16                 /*
  17                         macaddr<ip.ad.dr.ess<hostname<arpbind>anotherhwaddr<other.ip.addr.ess<othername<arpbind
  18                 */
  19
  20                 if ((vstrsep(b, "<", &macaddr, &ipaddr, &name, &bind)) != 4)
  21                         continue;
  22                 if (strchr(macaddr,',') != NULL)
  23                         continue;
  24                 if (strcmp(bind,"1") == 0)
  25                         eval ("arp", "-s", (char *)ipaddr, (char *)macaddr);
  26         }
  27         free(nv);
  28 }
  29
  30 void stop_arpbind(void) {
  31
  32         FILE *f;
  33         char buf[512];
  34         char ipaddr[48] = "";
  35
  36         if ((f = fopen("/proc/net/arp", "r")) != NULL) {
  37 //              fgets(buf, sizeof(buf), f);     // header
  38                 while (fgets(buf, sizeof(buf), f)) {
  39                         if (sscanf(buf, "%s %*s %*s %*s %*s %*s", ipaddr) != 1) continue;
  40                         eval ("arp", "-d", (char *)ipaddr);
  41                 }
  42                 fclose(f);
  43         }
  44
  45 }
  46