From: ts <decoux@...>
Date: 2002-06-22T22:32:30+09:00
Subject: getaddrinfo



 I've had some free times to look at this.

 Actually there are 3 cases :

  1) ruby use its own (old ???) version of getaddrinfo

nasun% ./ruby -rsocket -ve 'p Socket.sockaddr_in(21, "moulon")'
ruby 1.7.2 (2002-06-04) [sparc-solaris2.8]
"\000\002\000\025\212fr\001\000\000\000\000\000\000\000\000"
nasun% 

  2) ruby use the system getaddrinfo

pigeon% ruby -rsocket -ve 'p Socket.sockaddr_in(21, "moulon")'
ruby 1.7.2 (2002-06-20) [i686-linux]
-e:1:in `sockaddr_in': getaddrinfo: Servname not supported for ai_socktype (SocketError)
        from -e:1
pigeon%

 Reasons are given in

    http://www.wcug.wwu.edu/lists/ipng/200002/msg00134.html
    http://www.wcug.wwu.edu/lists/ipng/200002/msg00119.html


  3) ruby is compiled with --with-lookup-order-hack 

pigeon% ruby -rsocket -ve 'p Socket.sockaddr_in(21, "moulon")'
ruby 1.7.2 (2002-06-20) [i686-linux]
-e:1: [BUG] Segmentation fault
ruby 1.7.2 (2002-06-20) [i686-linux]
Aborted
pigeon% 

 easy to understand why.

 To make these 3 versions happy

pigeon% diff -u socket.c.old socket.c
--- socket.c.old        Sat Jun 22 14:18:46 2002
+++ socket.c    Sat Jun 22 14:41:33 2002
@@ -548,6 +548,22 @@
     mkipaddr0((struct sockaddr*)&sin, buf, len);
 }
 
+static int
+str_isnumber(p)
+        const char *p;
+{
+    char *ep;
+
+    if (!p || *p == '\0')
+       return 0;
+    ep = NULL;
+    (void)strtoul(p, &ep, 10);
+    if (ep && *ep == '\0')
+       return 1;
+    else
+       return 0;
+}
+
 static struct addrinfo*
 sock_addrinfo(host, port, socktype, flags)
     VALUE host, port;
@@ -598,17 +614,16 @@
        portp = RSTRING(port)->ptr;
     }
 
-    if (socktype == 0 && flags == 0) {
-       hintsp = 0;
-    }
-    else {
-       hintsp = &hints;
-       MEMZERO(&hints, struct addrinfo, 1);
-       hints.ai_family = PF_UNSPEC;
-       hints.ai_protocol = 0;
-       hints.ai_socktype = socktype;
-       hints.ai_flags = flags;
+    if (socktype == 0 && flags == 0 && str_isnumber(portp)) {
+       socktype = SOCK_DGRAM;
     }
+
+    hintsp = &hints;
+    MEMZERO(&hints, struct addrinfo, 1);
+    hints.ai_family = PF_UNSPEC;
+    hints.ai_protocol = 0;
+    hints.ai_socktype = socktype;
+    hints.ai_flags = flags;
     error = getaddrinfo(hostp, portp, hintsp, &res);
     if (error) {
        if (hostp && hostp[strlen(hostp)-1] == '\n') {
pigeon% 


pigeon% ruby -rsocket -ve 'p Socket.sockaddr_in(21, "moulon")'
ruby 1.7.2 (2002-06-20) [i686-linux]
"\002\000\000\025\212fr\001\000\000\000\000\000\000\000\000"
pigeon% 


Guy Decoux