IPv6 support in PJLIB

[bennylp]

Requirements:

• should work on most platforms where IPv6 is available (Windows, WinCE, Linux, *nix, MacOS X, and Symbian)
• optional

[bennylp]

Done in r1585:

New Configuration Macros:

• PJ_HAS_IPV6: declare this to enable IPv6 support. Default is no at the moment (may change in the future) (<pj/config.h>).
• PJ_SOCK_HAS_INET_PTON, PJ_SOCK_HAS_INET_NTOP, and PJ_SOCK_HAS_GETADDRINFO are macros that are autodetected by ./configure. These macros specify the presence of inet_pton(), inet_ntop(), and getaddrinfo() functions respectively.

New functions:

• pj_inet_ntop() - Converts binary IPv4/IPv6 address to text (<pj/sock.h>).
• pj_inet_pton() - Converts IPv6/IPv6 address text to binary (<pj/sock.h>).
• pj_getaddrinfo() - Query the IPv4/IPv6 address of a given hostname (<pj/addr_resolv.h>).

New error code::

• PJ_EIPV6NOTSUP - To indicate error because PJ_HAS_IPV6 is disabled (<pj/errno.h>)

New macros::

• PJ_INET_ADDRSTRLEN - To indicate the maximum length of IPv4 numeric address (<pj/sock.h>).
• PJ_INET6_ADDRSTRLEN - To indicate the maximum length of IPv6 numeric address (<pj/sock.h>).

[bennylp]

Some more major modifications in r1601:

In addr_resolv.h:

• Changed pj_gethostip() function to include address family
• Changed pj_getdefaultipinterface() function to include address family
• Added rhostresolver6 field in pj_symbianos_params

In errno.h:

• Added new errno: PJ_EAFNOTSUP

In sock.h:

• Various constant accessor functions (e.g. pj_AF_INET() now are implemented as macros when PJ_DLL is not declared
• Do not align pj_sockaddr_in6 to 64bit boundary since Winsock doesn't like it
• New API: pj_sockaddr_init()
• New API: pj_sockaddr_get_addr()
• New API: pj_sockaddr_has_addr()
• New API: pj_sockaddr_get_addr_len()
• New API: pj_sockaddr_set_str_addr()
• New API: pj_sockaddr_get_port()
• New API: pj_sockaddr_set_port()

[bennylp]

In r1608 and r1609:

• Added pj_sockaddr_get_len() and pj_inet_ntop2() API
• Fixed compilation warnings on Symbian with gcce.

[bennylp]

Fixed IPv6 interface enumeration on Linux in r1612

[bennylp]

New socket API in r1613:

• pj_sockaddr_cmp()
• pj_sockaddr_copy_addr()
• pj_sockaddr_print()

[bennylp]

Symbian's pjlibU.def file was updated in r1614