CPIInterfaceSet *
cpiInterfaceSet_FromJson(PARCJSON *json)
{
assertNotNull(json, "Parameter must be non-null");
PARCJSONValue *value = parcJSON_GetValueByName(json, cpi_InterfaceList);
assertNotNull(value,
"JSON key not found %s: %s",
cpi_InterfaceList,
parcJSON_ToString(json));
PARCJSONArray *ifaceSetJson = parcJSONValue_GetArray(value);
CPIInterfaceSet *set = cpiInterfaceSet_Create();
size_t length = parcJSONArray_GetLength(ifaceSetJson);
for (size_t i = 0; i < length; i++) {
value = parcJSONArray_GetValue(ifaceSetJson, i);
PARCJSON *ifaceJson = parcJSONValue_GetJSON(value);
CPIInterface *iface = cpiInterface_FromJson(ifaceJson);
cpiInterfaceSet_Add(set, iface);
}
return set;
}
CPIInterfaceSet *
metisSystem_Interfaces(MetisForwarder *metis)
{
CPIInterfaceSet *set = cpiInterfaceSet_Create();
// this is the dynamically allocated head of the list
struct ifaddrs *ifaddr;
int failure = getifaddrs(&ifaddr);
assertFalse(failure, "Error getifaddrs: (%d) %s", errno, strerror(errno));
struct ifaddrs *next;
for (next = ifaddr; next != NULL; next = next->ifa_next) {
if ((next->ifa_addr == NULL) || ((next->ifa_flags & IFF_UP) == 0)) {
continue;
}
// This assumes the LINK address comes first so we can get the MTU
// when the interface is created.
CPIInterface *iface = cpiInterfaceSet_GetByName(set, next->ifa_name);
if (iface == NULL) {
unsigned mtu = 0;
if (next->ifa_data != NULL) {
struct if_data *ifdata = (struct if_data *) next->ifa_data;
mtu = ifdata->ifi_mtu;
}
iface = cpiInterface_Create(next->ifa_name,
metisForwarder_GetNextConnectionId(metis),
next->ifa_flags & IFF_LOOPBACK,
next->ifa_flags & IFF_MULTICAST,
mtu);
cpiInterfaceSet_Add(set, iface);
}
int family = next->ifa_addr->sa_family;
switch (family) {
case AF_INET: {
CPIAddress *address = cpiAddress_CreateFromInet((struct sockaddr_in *) next->ifa_addr);
cpiInterface_AddAddress(iface, address);
break;
}
case AF_INET6: {
CPIAddress *address = cpiAddress_CreateFromInet6((struct sockaddr_in6 *) next->ifa_addr);
cpiInterface_AddAddress(iface, address);
break;
}
case AF_LINK: {
struct sockaddr_dl *addr_dl = (struct sockaddr_dl *) next->ifa_addr;
// skip links with 0-length address
if (addr_dl->sdl_alen > 0) {
// addr_dl->sdl_data[12] contains the interface name followed by the MAC address, so
// need to offset in to the array past the interface name.
CPIAddress *address = cpiAddress_CreateFromLink((uint8_t *) &addr_dl->sdl_data[ addr_dl->sdl_nlen], addr_dl->sdl_alen);
cpiInterface_AddAddress(iface, address);
}
break;
}
}
}
freeifaddrs(ifaddr);
return set;
}