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/*++
/* NAME
/* sock_addr 3
/* SUMMARY
/* sockaddr utilities
/* SYNOPSIS
/* #include <sock_addr.h>
/*
/* int sock_addr_cmp_addr(sa, sb)
/* const struct sockaddr *sa;
/* const struct sockaddr *sb;
/*
/* int sock_addr_cmp_port(sa, sb)
/* const struct sockaddr *sa;
/* const struct sockaddr *sb;
/*
/* int SOCK_ADDR_EQ_ADDR(sa, sb)
/* const struct sockaddr *sa;
/* const struct sockaddr *sb;
/*
/* int SOCK_ADDR_EQ_PORT(sa, sb)
/* const struct sockaddr *sa;
/* const struct sockaddr *sb;
/*
/* int sock_addr_in_loopback(sa)
/* const struct sockaddr *sa;
/* AUXILIARY MACROS
/* struct sockaddr *SOCK_ADDR_PTR(ptr)
/* unsigned char SOCK_ADDR_FAMILY(ptr)
/* unsigned char SOCK_ADDR_LEN(ptr)
/* void *SOCK_ADDR_ADDRP(ptr)
/* unsigned short SOCK_ADDR_PORT(ptr)
/* unsigned short *SOCK_ADDR_PORTP(ptr)
/*
/* struct sockaddr_in *SOCK_ADDR_IN_PTR(ptr)
/* unsigned char SOCK_ADDR_IN_FAMILY(ptr)
/* unsigned short SOCK_ADDR_IN_PORT(ptr)
/* struct in_addr SOCK_ADDR_IN_ADDR(ptr)
/* struct in_addr IN_ADDR(ptr)
/*
/* struct sockaddr_in6 *SOCK_ADDR_IN6_PTR(ptr)
/* unsigned char SOCK_ADDR_IN6_FAMILY(ptr)
/* unsigned short SOCK_ADDR_IN6_PORT(ptr)
/* struct in6_addr SOCK_ADDR_IN6_ADDR(ptr)
/* struct in6_addr IN6_ADDR(ptr)
/* DESCRIPTION
/* These utilities take protocol-independent address structures
/* and perform protocol-dependent operations on structure members.
/* Some of the macros described here are called unsafe,
/* because they evaluate one or more arguments multiple times.
/*
/* sock_addr_cmp_addr() or sock_addr_cmp_port() compare the
/* address family and network address or port fields for
/* equality, and return indication of the difference between
/* their arguments: < 0 if the first argument is "smaller",
/* 0 for equality, and > 0 if the first argument is "larger".
/*
/* The unsafe macros SOCK_ADDR_EQ_ADDR() or SOCK_ADDR_EQ_PORT()
/* compare compare the address family and network address or
/* port fields for equality, and return non-zero when their
/* arguments differ.
/*
/* sock_addr_in_loopback() determines if the argument specifies
/* a loopback address.
/*
/* The SOCK_ADDR_PTR() macro casts a generic pointer to (struct
/* sockaddr *). The name is upper case for consistency not
/* safety. SOCK_ADDR_FAMILY() and SOCK_ADDR_LEN() return the
/* address family and length of the real structure that hides
/* inside a generic sockaddr structure. On systems where struct
/* sockaddr has no sa_len member, SOCK_ADDR_LEN() cannot be
/* used as lvalue. SOCKADDR_ADDRP() returns a pointer to the
/* IPv4 or IPv6 address. SOCK_ADDR_PORT() returns the IPv4 or IPv6
/* port number, in network byte order; it must not be used as
/* lvalue. SOCK_ADDR_PORTP() returns a pointer to the same.
/*
/* The macros SOCK_ADDR_IN{,6}_{PTR,FAMILY,PORT,ADDR}() cast
/* a generic pointer to a specific socket address structure
/* pointer, or access a specific socket address structure
/* member. These can be used as lvalues.
/*
/* The unsafe INADDR() and IN6_ADDR() macros dereference a
/* generic pointer to a specific address structure.
/* DIAGNOSTICS
/* Panic: unsupported address family.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System library. */
#include <sys_defs.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
/* Utility library. */
#include <msg.h>
#include <sock_addr.h>
/* sock_addr_cmp_addr - compare addresses for equality */
int sock_addr_cmp_addr(const struct sockaddr *sa,
const struct sockaddr *sb)
{
if (sa->sa_family != sb->sa_family)
return (sa->sa_family - sb->sa_family);
/*
* With IPv6 address structures, assume a non-hostile implementation that
* stores the address as a contiguous sequence of bits. Any holes in the
* sequence would invalidate the use of memcmp().
*/
if (sa->sa_family == AF_INET) {
return (SOCK_ADDR_IN_ADDR(sa).s_addr - SOCK_ADDR_IN_ADDR(sb).s_addr);
#ifdef HAS_IPV6
} else if (sa->sa_family == AF_INET6) {
return (memcmp((void *) &(SOCK_ADDR_IN6_ADDR(sa)),
(void *) &(SOCK_ADDR_IN6_ADDR(sb)),
sizeof(SOCK_ADDR_IN6_ADDR(sa))));
#endif
} else {
msg_panic("sock_addr_cmp_addr: unsupported address family %d",
sa->sa_family);
}
}
/* sock_addr_cmp_port - compare ports for equality */
int sock_addr_cmp_port(const struct sockaddr *sa,
const struct sockaddr *sb)
{
if (sa->sa_family != sb->sa_family)
return (sa->sa_family - sb->sa_family);
if (sa->sa_family == AF_INET) {
return (SOCK_ADDR_IN_PORT(sa) - SOCK_ADDR_IN_PORT(sb));
#ifdef HAS_IPV6
} else if (sa->sa_family == AF_INET6) {
return (SOCK_ADDR_IN6_PORT(sa) - SOCK_ADDR_IN6_PORT(sb));
#endif
} else {
msg_panic("sock_addr_cmp_port: unsupported address family %d",
sa->sa_family);
}
}
/* sock_addr_in_loopback - determine if address is loopback */
int sock_addr_in_loopback(const struct sockaddr *sa)
{
unsigned long inaddr;
if (sa->sa_family == AF_INET) {
inaddr = ntohl(SOCK_ADDR_IN_ADDR(sa).s_addr);
return (IN_CLASSA(inaddr)
&& ((inaddr & IN_CLASSA_NET) >> IN_CLASSA_NSHIFT)
== IN_LOOPBACKNET);
#ifdef HAS_IPV6
} else if (sa->sa_family == AF_INET6) {
return (IN6_IS_ADDR_LOOPBACK(&SOCK_ADDR_IN6_ADDR(sa)));
#endif
} else {
msg_panic("sock_addr_in_loopback: unsupported address family %d",
sa->sa_family);
}
}
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