+char* calcTransferNetAddress(const connection* conn) {
+ char *address = strdup(conn->transfer_subnet);
+ address = strsep(&address, "/");
+
+ struct in_addr address_info;
+ if (!inet_aton(address, &address_info)) {
+ goto ERROR;
+ }
+
+ if (strcmp(conn->role, "server")) {
+ address_info.s_addr += 1 << 24;
+ } else if (strcmp(conn->role, "client")) {
+ address_info.s_addr += 2 << 24;
+ } else {
+ goto ERROR;
+ }
+
+ address = inet_ntoa(address_info);
+ return address;
+
+ERROR:
+ free(address);
+ return NULL;
+}
+
+char* getLocalSubnetAddress(const connection* conn) {
+ kv = initkeyvalues();
+ if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings")) {
+ fprintf(stderr, "Cannot read ethernet settings\n");
+ exit(1);
+ }
+
+ const char *zones[] = {"GREEN", "BLUE", "ORANGE", NULL};
+ char *zone = NULL;
+
+ // Get net address of the local openvpn subnet.
+ char *subnetmask = strdup(conn->local_subnet);
+ char *address = strsep(&subnetmask, "/");
+
+ if ((address == NULL) || (subnetmask == NULL)) {
+ goto ERROR;
+ }
+
+ in_addr_t _address = inet_addr(address);
+ in_addr_t _subnetmask = inet_addr(subnetmask);
+
+ in_addr_t _netaddr = (_address & _subnetmask);
+ in_addr_t _broadcast = (_address | ~_subnetmask);
+
+ char zone_address_key[STRING_SIZE];
+ char zone_address[STRING_SIZE];
+ in_addr_t zone_addr;
+
+ int i = 0;
+ while (zones[i]) {
+ zone = zones[i++];
+ snprintf(zone_address_key, STRING_SIZE, "%s_ADDRESS", zone);
+
+ if (!findkey(kv, zone_address_key, zone_address))
+ continue;
+
+ zone_addr = inet_addr(zone_address);
+ if ((zone_addr > _netaddr) && (zone_addr < _broadcast)) {
+ freekeyvalues(kv);
+
+ return strdup(zone_address);
+ }
+ }
+
+ERROR:
+ freekeyvalues(kv);
+ return NULL;
+}
+