1 files changed, 109 insertions, 0 deletions
diff --git a/src/common/win32/ifaddrs.cc b/src/common/win32/ifaddrs.cc
new file mode 100644
index 000000000..d7de4a5ff
--- /dev/null
+++ b/src/common/win32/ifaddrs.cc
@@ -0,0 +1,109 @@
+#include <errno.h>
+#include <winsock2.h>
+#include <wincrypt.h>
+#include <iphlpapi.h>
+#include <ws2tcpip.h>
+#include <ifaddrs.h>
+#include <stdio.h>
+
+#include "include/compat.h"
+
+int getifaddrs(struct ifaddrs **ifap)
+{
+  int ret = 0;
+
+  DWORD size, res = 0;
+  res = GetAdaptersAddresses(
+    AF_UNSPEC, GAA_FLAG_INCLUDE_PREFIX,
+    NULL, NULL, &size);
+  if (res != ERROR_BUFFER_OVERFLOW) {
+    errno = ENOMEM;
+    return -1;
+  }
+
+  PIP_ADAPTER_ADDRESSES adapter_addrs = (PIP_ADAPTER_ADDRESSES)malloc(size);
+  res = GetAdaptersAddresses(
+    AF_UNSPEC, GAA_FLAG_INCLUDE_PREFIX,
+    NULL, adapter_addrs, &size);
+  if (res != ERROR_SUCCESS) {
+    errno = ENOMEM;
+    return -1;
+  }
+
+  struct ifaddrs *out_list_head = NULL;
+  struct ifaddrs *out_list_curr;
+
+  for (PIP_ADAPTER_ADDRESSES curr_addrs = adapter_addrs;
+       curr_addrs != NULL;
+       curr_addrs = curr_addrs->Next) {
+    if (curr_addrs->OperStatus != 1)
+      continue;
+
+    for (PIP_ADAPTER_UNICAST_ADDRESS unicast_addrs = curr_addrs->FirstUnicastAddress;
+         unicast_addrs != NULL;
+         unicast_addrs = unicast_addrs->Next) {
+      SOCKADDR* unicast_sockaddr = unicast_addrs->Address.lpSockaddr;
+      if (unicast_sockaddr->sa_family != AF_INET &&
+          unicast_sockaddr->sa_family != AF_INET6)
+        continue;
+      out_list_curr = calloc(sizeof(*out_list_curr), 1);
+      if (!out_list_curr) {
+        errno = ENOMEM;
+        ret = -1;
+        goto out;
+      }
+
+      out_list_curr->ifa_next = out_list_head;
+      out_list_head = out_list_curr;
+
+      out_list_curr->ifa_flags = IFF_UP;
+      if (curr_addrs->IfType == IF_TYPE_SOFTWARE_LOOPBACK)
+        out_list_curr->ifa_flags |= IFF_LOOPBACK;
+
+      out_list_curr->ifa_addr = (struct sockaddr *) &out_list_curr->in_addrs;
+      out_list_curr->ifa_netmask = (struct sockaddr *) &out_list_curr->in_netmasks;
+      out_list_curr->ifa_name = out_list_curr->ad_name;
+
+      if (unicast_sockaddr->sa_family == AF_INET) {
+        ULONG subnet_mask = 0;
+        if (ConvertLengthToIpv4Mask(unicast_addrs->OnLinkPrefixLength, &subnet_mask)) {
+          errno = ENODATA;
+          ret = -1;
+          goto out;
+        }
+        struct sockaddr_in *addr4 = (struct sockaddr_in *) &out_list_curr->in_addrs;
+        struct sockaddr_in *netmask4 = (struct sockaddr_in *) &out_list_curr->in_netmasks;
+        netmask4->sin_family = unicast_sockaddr->sa_family;
+        addr4->sin_family = unicast_sockaddr->sa_family;
+        netmask4->sin_addr.S_un.S_addr = subnet_mask;
+        addr4->sin_addr = ((struct sockaddr_in*) unicast_sockaddr)->sin_addr;
+      } else {
+        struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &out_list_curr->in_addrs;
+        (*addr6) = *(struct sockaddr_in6 *) unicast_sockaddr;
+      }
+      out_list_curr->speed = curr_addrs->TransmitLinkSpeed;
+      // TODO maybe use friendly name instead of adapter GUID
+      sprintf_s(out_list_curr->ad_name,
+                sizeof(out_list_curr->ad_name),
+                curr_addrs->AdapterName);
+    }
+  }
+  ret = 0;
+out:
+  free(adapter_addrs);
+  if (ret && out_list_head)
+    free(out_list_head);
+  else if (ifap)
+    *ifap = out_list_head;
+
+  return ret;
+}
+
+void freeifaddrs(struct ifaddrs *ifa)
+{
+  while (ifa) {
+    struct ifaddrs *next = ifa->ifa_next;
+    free(ifa);
+    ifa = next;
+  }
+}