socket.bind also tries all addresses returned by getaddrinfo.

TODO

@@ -1,11 +1,11 @@
+- document bind and connect behavior.
 - getsockname should also support IPv6, no?
 - shouldn't we instead make the code compatible to Lua 5.2
   without any compat stuff, and use a compatibility layer to
   make it work on 5.1?
 - add what's new to manual
 - should there be an equivalent to tohostname for IPv6?
 - should we add service name resolution as well to getaddrinfo?
-- document bind and connect behavior based on address?
 
 - add http POST sample to manual
   people keep asking stupid questions
@@ -16,6 +16,7 @@
 
 Done:
 
+- connect and bind try all adresses returned by getaddrinfo
 - document headers.lua?
 - update copyright date everywhere? 
 - remove RCSID from files?

src/socket.lua

@@ -19,8 +19,8 @@ function connect(address, port, laddress, lport)
     if address == "*" then address = "0.0.0.0" end
     local addrinfo, err = socket.dns.getaddrinfo(address);
     if not addrinfo then return nil, err end
-    local err = "no info on address"
     local sock, res
+    err = "no info on address"
     for i, alt in base.ipairs(addrinfo) do 
         if alt.family == "inet" then
             sock, err = socket.tcp()
@@ -49,19 +49,29 @@ function bind(host, port, backlog)
     if host == "*" then host = "0.0.0.0" end
     local addrinfo, err = socket.dns.getaddrinfo(host);
     if not addrinfo then return nil, err end
-    local sock, err;
-    if addrinfo[1].family == "inet" then
-        sock, err = socket.tcp()
-    else
-        sock, err = socket.tcp6()
+    local sock, res
+    err = "no info on address"
+    for i, alt in base.ipairs(addrinfo) do
+        if alt.family == "inet" then
+            sock, err = socket.tcp()
+        else
+            sock, err = socket.tcp6()
+        end
+        if not sock then return nil, err end
+        sock:setoption("reuseaddr", true)
+        res, err = sock:bind(alt.addr, port)
+        if not res then 
+            sock:close()
+        else 
+            res, err = sock:listen(backlog)
+            if not res then 
+                sock:close()
+            else
+                return sock
+            end
+        end 
     end
-    if not sock then return nil, err end
-    sock:setoption("reuseaddr", true)
-    local res, err = sock:bind(host, port)
-    if not res then return nil, err end
-    res, err = sock:listen(backlog)
-    if not res then return nil, err end
-    return sock
+    return nil, err
 end
 
 try = newtry()