https://issues.apache.org/bugzilla/show_bug.cgi?id=39621
--- Comment #7 from Lalit Mishra <lalit.mis...@airtightnetworks.com> 2010-07-26 01:48:36 EDT --- Created an attachment (id=25801) --> (https://issues.apache.org/bugzilla/attachment.cgi?id=25801) apr-1.3.9-patch We faced this problem with RedHat 9 only when IPv6 is disabled. Linux 2.6.12.3 #1 SMP Tue Jun 10 17:56:55 IST 2008 i686 i686 i386 GNU/Linux (this is not the stock kernel in RH 9). APR version 1.3.9. Absence of AI_ADDRCONFIG flag for getaddrinfo in glibc is the root cause. >From man getaddrinfo - If hints.ai_flags includes the AI_ADDRCONFIG flag, then IPv4 addresses are returned in the list pointed to by result only if the local system has at lea st one IPv4 address configured, and IPv6 addresses are only returned if the local system has at least one IPv6 address configured. When tomcat searches for local address to bind, it finally calls call_resolver function of sockaddr.c in APR with hostname=null. As AI_ADDRCONFIG flag is not present, getaddrinfo returns "::" and 0.0.0.0 in the list of available addresses. The tcnative method (Address.info, see address.c) prefers the IPv6 (::) address among these and returns this to Tomcat, and Tomcat specifies this address to bind to the socket (surprisingly, the kernel does not complain when binding an IPv6 address to an AF_INET socket). Therefore, APR code falsely ends up setting AF_INET6 to local_addr->family and (later when accept returns) to remote_addr->family as well. Thus when an IPv4 host connects, though accept returns proper IPv4 address to APR, APR still believes it to be IPv6 address and messes up while translating to presentation format. Fix: If AI_ADDRCONFIF flag is not present, we need to determine if IPv6 is *actually* available or not. This can be achieved by trying to open an IPv6 socket. If this fails then set hints.ai_family to AF_INET so that getaddrinfo returns IPv4 addresses only. Of course do this only when family has been specified as AF_UNSPEC. We do not want to return IPv4 addresses when asked specifically for IPv6 addresses. Please see attached patch (for APR 1.3.9). -- Configure bugmail: https://issues.apache.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org For additional commands, e-mail: dev-h...@tomcat.apache.org
