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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:22:09 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:22:09 +0000
commit43a97878ce14b72f0981164f87f2e35e14151312 (patch)
tree620249daf56c0258faa40cbdcf9cfba06de2a846 /docs/nspr/reference/prnetaddr.rst
parentInitial commit. (diff)
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Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+PRNetAddr
+=========
+
+Type used with `Socket Manipulation
+Functions <Socket_Manipulation_Functions>`__ to specify a network
+address.
+
+
+Syntax
+------
+
+.. code::
+
+ #include <prio.h>
+
+ union PRNetAddr {
+ struct {
+ PRUint16 family;
+ char data[14];
+ } raw;
+ struct {
+ PRUint16 family;
+ PRUint16 port;
+ PRUint32 ip;
+ char pad[8];
+ } inet;
+ #if defined(_PR_INET6)
+ struct {
+ PRUint16 family;
+ PRUint16 port;
+ PRUint32 flowinfo;
+ PRIPv6Addr ip;
+ } ipv6;
+ #endif /* defined(_PR_INET6) */
+ };
+
+ typedef union PRNetAddr PRNetAddr;
+
+
+Fields
+~~~~~~
+
+The structure has the following fields:
+
+``family``
+ Address family: ``PR_AF_INET|PR_AF_INET6`` for ``raw.family``,
+ ``PR_AF_INET`` for ``inet.family``, ``PR_AF_INET6`` for
+ ``ipv6.family``.
+``data``
+ Raw address data.
+``port``
+ Port number of TCP or UDP, in network byte order.
+``ip``
+ The actual 32 (for ``inet.ip``) or 128 (for ``ipv6.ip``) bits of IP
+ address. The ``inet.ip`` field is in network byte order.
+``pad``
+ Unused.
+``flowinfo``
+ Routing information.
+
+
+Description
+-----------
+
+The union :ref:`PRNetAddr` represents a network address. NSPR supports only
+the Internet address family. By default, NSPR is built to support only
+IPv4, but it's possible to build the NSPR library to support both IPv4
+and IPv6. Therefore, the ``family`` field can be ``PR_AF_INET`` only for
+default NSPR, and can also be ``PR_AF_INET6`` if the binary supports
+``IPv6``.
+
+:ref:`PRNetAddr` is binary-compatible with the socket address structures in
+the familiar Berkeley socket interface, although this fact should not be
+relied upon. The raw member of the union is equivalent to
+``struct sockaddr``, the ``inet`` member is equivalent to
+``struct sockaddr_in``, and if the binary is built with ``IPv6``
+support, the ``ipv6`` member is equivalent to ``struct sockaddr_in6``.
+(Note that :ref:`PRNetAddr` does not have the ``length`` field that is
+present in ``struct sockaddr_in`` on some Unix platforms.)
+
+The macros ``PR_AF_INET``, ``PR_AF_INET6``, ``PR_INADDR_ANY``,
+``PR_INADDR_LOOPBACK`` are defined if ``prio.h`` is included.
+``PR_INADDR_ANY`` and ``PR_INADDR_LOOPBACK`` are special ``IPv4``
+addresses in host byte order, so they must be converted to network byte
+order before being assigned to the ``inet.ip`` field.