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[Bug network/12377] getaddrinfo() should disregard link-local IPv6 addresses for AI_ADDRCONFIG purposes


http://sourceware.org/bugzilla/show_bug.cgi?id=12377

--- Comment #10 from Pavel Åimerda <psimerda at redhat dot com> 2012-07-27 14:01:21 UTC ---
Testing environment:

glibc-2.15-51.fc17.x86_64

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
qlen 1000
    link/ether 52:54:00:8e:93:da brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
qlen 1000
    link/ether 52:54:00:eb:e9:fb brd ff:ff:ff:ff:ff:ff
    inet6 fe80::5054:ff:feeb:e9fb/64 scope link 
       valid_lft forever preferred_lft forever

IPv4 literal localhost test:

# ./gai 127.0.0.1
getaddrinfo 1( 127.0.0.1, NULL, ... )
     ai_family=2, ai_socktype=1, ai_flags=32
getaddrinfo 1 => EAI_NONAME(-2)
error

IPv6 literal localhost test:

# ./gai ::1
getaddrinfo 1( 127.0.0.1, NULL, ... )
     ai_family=2, ai_socktype=1, ai_flags=32
getaddrinfo 1 => EAI_NONAME(-2)
error

IPv4 DNS localhost test:

# ./gai localhost4
getaddrinfo 1( 127.0.0.1, NULL, ... )
     ai_family=2, ai_socktype=1, ai_flags=32
getaddrinfo 1 => EAI_NONAME(-2)
error

IPv6 DNS localhost test:

# ./gai localhost6
getaddrinfo 1( 127.0.0.1, NULL, ... )
     ai_family=2, ai_socktype=1, ai_flags=32
getaddrinfo 1 => EAI_NONAME(-2)
error

Neutral DNS test:

# ./gai localhost
getaddrinfo 1( 127.0.0.1, NULL, ... )
     ai_family=2, ai_socktype=1, ai_flags=32
getaddrinfo 1 => EAI_NONAME(-2)
error

A quick test to see if it works normally *with* a global IPv4 address:

# ./gai localhost
getaddrinfo 1( 127.0.0.1, NULL, ... )
     ai_family=2, ai_socktype=1, ai_flags=32
getaddrinfo 1 => Success(0)
family: AF_INET
sin_addr 0x0100007f sin_port 0x0000

Note: This only happens with this version if my gai.c uses AI_ADDRCONFIG.

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