[tor-bugs] #17952 [Tor]: Make address family search via ioctl more accurate on obscure platforms

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#17952: Make address family search via ioctl more accurate on obscure platforms
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     Reporter:  teor         |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:  Tor: 0.2.???
    Component:  Tor          |    Version:
     Severity:  Normal       |   Keywords:  ipv6 easy lorax
Actual Points:               |  Parent ID:
       Points:               |    Sponsor:
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 The following address family search functions only return an IPv6 address
 on some platforms:
 * ioctl(.,SIOCGIFCONF,.) only returns IPv4 addresses, except:
   * on HP-UX and Solaris, which support AF_INET6 with SIOCGLIFCONF
     * see http://www.manpages.info/sunos/if_tcp.7.html
   * on AIX, using the sa_len field in struct sockaddr to distinguish
 between IPv4 and IPv6 addresses
   * on MVS and z/OS, which support AF_INET6 with SIOCGIFCONF6 /
 __net_ifconf6header_s
     * see http://www-01.ibm.com/support/docview.wss?uid=isg1PK22885 for
 details
   * on these platforms, we should try AF_INET, then AF_INET6, and then
 both addresses should be returned

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17952>
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