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/* ========================================================================
* Copyright 1988-2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: UNIX IPv6 routines
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 18 December 2003
* Last Edited: 30 August 2006
*/
/*
* There is some amazingly bad design in IPv6 sockets.
*
* Supposedly, the new getnameinfo() and getaddrinfo() functions create an
* abstraction that is not dependent upon IPv4 or IPv6. However, the
* definition of getnameinfo() requires that the caller pass the length of
* the sockaddr instead of deriving it from sa_family. The man page says
* that there's an sa_len member in the sockaddr, but actually there isn't.
* This means that any caller to getnameinfo() and getaddrinfo() has to know
* the size for the protocol family used by that sockaddr.
*
* The new sockaddr_in6 is bigger than the generic sockaddr (which is what
* connect(), accept(), bind(), getpeername(), getsockname(), etc. expect).
* Rather than increase the size of sockaddr, there's a new sockaddr_storage
* which is only usable for allocating space.
*/
#define SADRLEN sizeof (struct sockaddr_storage)
#define SADR4(sadr) ((struct sockaddr_in *) sadr)
#define SADR4LEN sizeof (struct sockaddr_in)
#define SADR4ADR(sadr) SADR4 (sadr)->sin_addr
#define ADR4LEN sizeof (struct in_addr)
#define SADR4PORT(sadr) SADR4 (sadr)->sin_port
#define SADR6(sadr) ((struct sockaddr_in6 *) sadr)
#define SADR6LEN sizeof (struct sockaddr_in6)
#define SADR6ADR(sadr) SADR6 (sadr)->sin6_addr
#define ADR6LEN sizeof (struct in6_addr)
#define SADR6PORT(sadr) SADR6 (sadr)->sin6_port
/* IP abstraction layer */
char *ip_sockaddrtostring (struct sockaddr *sadr);
long ip_sockaddrtoport (struct sockaddr *sadr);
void *ip_stringtoaddr (char *text,size_t *len,int *family);
struct sockaddr *ip_newsockaddr (size_t *len);
struct sockaddr *ip_sockaddr (int family,void *adr,size_t adrlen,
unsigned short port,size_t *len);
char *ip_sockaddrtoname (struct sockaddr *sadr);
void *ip_nametoaddr (char *name,size_t *len,int *family,char **canonical,
void **next);
/* Return IP address string from socket address
* Accepts: socket address
* Returns: IP address as name string
*/
char *ip_sockaddrtostring (struct sockaddr *sadr)
{
static char tmp[NI_MAXHOST];
switch (sadr->sa_family) {
case PF_INET: /* IPv4 */
if (!getnameinfo (sadr,SADR4LEN,tmp,NI_MAXHOST,NIL,NIL,NI_NUMERICHOST))
return tmp;
break;
case PF_INET6: /* IPv6 */
if (!getnameinfo (sadr,SADR6LEN,tmp,NI_MAXHOST,NIL,NIL,NI_NUMERICHOST))
return tmp;
break;
}
return "NON-IP";
}
/* Return port from socket address
* Accepts: socket address
* Returns: port number or -1 if can't determine it
*/
long ip_sockaddrtoport (struct sockaddr *sadr)
{
switch (sadr->sa_family) {
case PF_INET:
return ntohs (SADR4PORT (sadr));
case PF_INET6:
return ntohs (SADR6PORT (sadr));
}
return -1;
}
/* Return IP address from string
* Accepts: name string
* pointer to returned length
* pointer to returned address family
* Returns: address if valid, length and family updated, or NIL
*/
void *ip_stringtoaddr (char *text,size_t *len,int *family)
{
char tmp[MAILTMPLEN];
static struct addrinfo *hints;
struct addrinfo *ai;
void *adr = NIL;
if (!hints) { /* hints set up yet? */
hints = (struct addrinfo *) /* one-time setup */
memset (fs_get (sizeof (struct addrinfo)),0,sizeof (struct addrinfo));
hints->ai_family = AF_UNSPEC;/* allow any address family */
hints->ai_socktype = SOCK_STREAM;
/* numeric name only */
hints->ai_flags = AI_NUMERICHOST;
}
/* case-independent lookup */
if (text && (strlen (text) < MAILTMPLEN) &&
(!getaddrinfo (lcase (strcpy (tmp,text)),NIL,hints,&ai))) {
switch (*family = ai->ai_family) {
case AF_INET: /* IPv4 */
adr = fs_get (*len = ADR4LEN);
memcpy (adr,(void *) &SADR4ADR (ai->ai_addr),*len);
break;
case AF_INET6: /* IPv6 */
adr = fs_get (*len = ADR6LEN);
memcpy (adr,(void *) &SADR6ADR (ai->ai_addr),*len);
break;
}
freeaddrinfo (ai); /* free addrinfo */
}
return adr;
}
/* Create a maximum-size socket address
* Accepts: pointer to return maximum socket address length
* Returns: new, empty socket address of maximum size
*/
struct sockaddr *ip_newsockaddr (size_t *len)
{
return (struct sockaddr *) memset (fs_get (SADRLEN),0,*len = SADRLEN);
}
/* Stuff a socket address
* Accepts: address family
* IPv4 address
* length of address
* port number
* pointer to return socket address length
* Returns: socket address
*/
struct sockaddr *ip_sockaddr (int family,void *adr,size_t adrlen,
unsigned short port,size_t *len)
{
struct sockaddr *sadr = ip_newsockaddr (len);
switch (family) { /* build socket address based upon family */
case AF_INET: /* IPv4 */
sadr->sa_family = PF_INET;
/* copy host address */
memcpy (&SADR4ADR (sadr),adr,adrlen);
/* copy port number in network format */
SADR4PORT (sadr) = htons (port);
*len = SADR4LEN;
break;
case AF_INET6: /* IPv6 */
sadr->sa_family = PF_INET6;
/* copy host address */
memcpy (&SADR6ADR (sadr),adr,adrlen);
/* copy port number in network format */
SADR6PORT (sadr) = htons (port);
*len = SADR6LEN;
break;
default: /* non-IP?? */
sadr->sa_family = PF_UNSPEC;
break;
}
return sadr;
}
/* Return name from socket address
* Accepts: socket address
* Returns: canonical name for that address or NIL if none
*/
char *ip_sockaddrtoname (struct sockaddr *sadr)
{
static char tmp[NI_MAXHOST];
switch (sadr->sa_family) {
case PF_INET: /* IPv4 */
if (!getnameinfo (sadr,SADR4LEN,tmp,NI_MAXHOST,NIL,NIL,NI_NAMEREQD))
return tmp;
break;
case PF_INET6: /* IPv6 */
if (!getnameinfo (sadr,SADR6LEN,tmp,NI_MAXHOST,NIL,NIL,NI_NAMEREQD))
return tmp;
break;
}
return NIL;
}
/* Return address from name
* Accepts: name or NIL to return next address
* pointer to previous/returned length
* pointer to previous/returned address family
* pointer to previous/returned canonical name
* pointer to previous/return state for next-address calls
* Returns: address with length/family/canonical updated if needed, or NIL
*/
void *ip_nametoaddr (char *name,size_t *len,int *family,char **canonical,
void **next)
{
struct addrinfo *cur = NIL;
static struct addrinfo *hints;
static struct addrinfo *ai = NIL;
static char lcname[MAILTMPLEN];
if (!hints) { /* hints set up yet? */
hints = (struct addrinfo *) /* one-time setup */
memset (fs_get (sizeof (struct addrinfo)),0,sizeof (struct addrinfo));
/* allow any address family */
hints->ai_family = AF_UNSPEC;
hints->ai_socktype = SOCK_STREAM;
/* need canonical name */
hints->ai_flags = AI_CANONNAME;
}
if (name) { /* name supplied? */
if (ai) {
freeaddrinfo (ai); /* free old addrinfo */
ai = NIL;
}
/* case-independent lookup */
if ((strlen (name) < MAILTMPLEN) &&
(!getaddrinfo (lcase (strcpy (lcname,name)),NIL,hints,&ai))) {
cur = ai; /* current block */
if (canonical) /* set canonical name */
*canonical = cur->ai_canonname ? cur->ai_canonname : lcname;
/* remember as next block */
if (next) *next = (void *) ai;
}
else { /* error */
cur = NIL;
if (len) *len = 0;
if (family) *family = 0;
if (canonical) *canonical = NIL;
if (next) *next = NIL;
}
}
/* return next in series */
else if (next && (cur = ((struct addrinfo *) *next)->ai_next)) {
*next = cur; /* set as last address */
/* set canonical in case changed */
if (canonical && cur->ai_canonname) *canonical = cur->ai_canonname;
}
if (cur) { /* got data? */
if (family) *family = cur->ai_family;
switch (cur->ai_family) {
case AF_INET:
if (len) *len = ADR4LEN;
return (void *) &SADR4ADR (cur->ai_addr);
case AF_INET6:
if (len) *len = ADR6LEN;
return (void *) &SADR6ADR (cur->ai_addr);
}
}
if (len) *len = 0; /* error return */
return NIL;
}
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