util: Add InAddrAny population function

We commonly want to be able to turn netlink network order address data
into the corresponding InAddrAny when parsing netlink data. This makes
it trivial given the address family and data buffer.

Tested:
    Ran throgh unit tests and builds fine in a BMC image.

Change-Id: I4ebe1dbd284f150ea03ee091cddda5a06806c01f
Signed-off-by: William A. Kennington III <wak@google.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/util.cpp b/util.cpp
index db164e6..b1300fb 100644
--- a/util.cpp
+++ b/util.cpp
@@ -204,6 +204,32 @@ std::string getNetworkID(int addressFamily, const std::string& ipaddress,
     return networkString;
 }
 
+InAddrAny addrFromBuf(int addressFamily, std::string_view buf)
+{
+    if (addressFamily == AF_INET)
+    {
+        struct in_addr ret;
+        if (buf.size() != sizeof(ret))
+        {
+            throw std::runtime_error("Buf not in_addr sized");
+        }
+        memcpy(&ret, buf.data(), sizeof(ret));
+        return ret;
+    }
+    else if (addressFamily == AF_INET6)
+    {
+        struct in6_addr ret;
+        if (buf.size() != sizeof(ret))
+        {
+            throw std::runtime_error("Buf not in6_addr sized");
+        }
+        memcpy(&ret, buf.data(), sizeof(ret));
+        return ret;
+    }
+
+    throw std::runtime_error("Unsupported address family");
+}
+
 std::string toString(const InAddrAny& addr)
 {
     std::string ip;