release/src/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         int anyways = nvram_get_int("arpbind_listed");
  10
  11         nvp = nv = strdup(nvram_safe_get("dhcpd_static"));
  12
  13         if (!nv) return;
  14
  15 // clear arp table first
  16         stop_arpbind();
  17
  18         while ((b = strsep(&nvp, ">")) != NULL) {
  19                 /*
  20                         macaddr<ip.ad.dr.ess<hostname<arpbind>anotherhwaddr<other.ip.addr.ess<othername<arpbind
  21                 */
  22
  23                 if ((vstrsep(b, "<", &macaddr, &ipaddr, &name, &bind)) != 4)
  24                         continue;
  25                 if (strchr(macaddr,',') != NULL)
  26                         continue;
  27                 if ((strcmp(bind,"1") == 0) || (anyways == 1))
  28                         eval ("arp", "-s", (char *)ipaddr, (char *)macaddr);
  29         }
  30         free(nv);
  31 }
  32
  33 void stop_arpbind(void) {
  34
  35         FILE *f;
  36         char buf[512];
  37         char ipaddr[48] = "";
  38
  39         if ((f = fopen("/proc/net/arp", "r")) != NULL) {
  40                 fgets(buf, sizeof(buf), f);     // header - 1st line should be indeed ignored
  41                 while (fgets(buf, sizeof(buf), f)) {
  42                         if (sscanf(buf, "%s %*s %*s %*s %*s %*s", ipaddr) != 1) continue;
  43                         eval ("arp", "-d", (char *)ipaddr);
  44                 }
  45                 fclose(f);
  46         }
  47
  48 }
  49