src/promisc.c

   1 /* For terms of usage/redistribution/modification see the LICENSE file */
   2 /* For authors and contributors see the AUTHORS file */
   3
   4 /***
   5
   6 promisc.c       - handles the promiscuous mode flag for the Ethernet/FDDI/
   7               Token Ring interfaces
   8
   9 ***/
  10
  11 #include "iptraf-ng-compat.h"
  12
  13 #include "ifaces.h"
  14 #include "error.h"
  15 #include "promisc.h"
  16
  17 static void promisc_add_dev(struct list_head *promisc, const char *dev_name)
  18 {
  19         struct promisc_list *p = xmallocz(sizeof(*p));
  20         strcpy(p->ifname, dev_name);
  21         INIT_LIST_HEAD(&p->list);
  22
  23         list_add_tail(&p->list, promisc);
  24 }
  25
  26 void promisc_init(struct list_head *promisc, const char *device_name)
  27 {
  28         if (device_name) {
  29                 int flags = dev_promisc_flag(device_name);
  30                 if (flags < 0)
  31                         return;
  32
  33                 promisc_add_dev(promisc, device_name);
  34
  35                 return;
  36         }
  37
  38         FILE *fp = open_procnetdev();
  39         if (!fp)
  40                 die_errno("%s: open_procnetdev", __func__);
  41
  42         char dev_name[IFNAMSIZ];
  43         while (get_next_iface(fp, dev_name, sizeof(dev_name))) {
  44                 if (!strcmp(dev_name, ""))
  45                         continue;
  46
  47                 int flags = dev_promisc_flag(dev_name);
  48                 if (flags < 0)
  49                         continue;
  50
  51                 promisc_add_dev(promisc, dev_name);
  52         }
  53
  54         fclose(fp);
  55 }
  56
  57 void promisc_set_list(struct list_head *promisc)
  58 {
  59         struct promisc_list *entry = NULL;
  60         list_for_each_entry(entry, promisc, list) {
  61                 int r = dev_set_promisc(entry->ifname);
  62                 if (r < 0)
  63                         write_error("Failed to set promiscuous mode on %s", entry->ifname);
  64         }
  65 }
  66
  67 void promisc_restore_list(struct list_head *promisc)
  68 {
  69         struct promisc_list *entry = NULL;
  70         list_for_each_entry(entry, promisc, list) {
  71                 int r = dev_clr_promisc(entry->ifname);
  72                 if (r < 0)
  73                         write_error("Failed to clear promiscuous mode on %s", entry->ifname);
  74         }
  75 }
  76
  77 void promisc_destroy(struct list_head *promisc)
  78 {
  79         struct promisc_list *entry, *tmp;
  80         list_for_each_entry_safe(entry, tmp, promisc, list) {
  81                 list_del(&entry->list);
  82                 free(entry);
  83         }
  84 }