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Simplify IPv4 mapped IPv6 address handling.

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Reviewed by:	brian
MFC after:	5 days
This commit is contained in:
Hajimu UMEMOTO 2001-07-23 21:42:22 +00:00
parent c31b4a5381
commit 27daeab3ec
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=80223
1 changed files with 39 additions and 66 deletions
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105
lib/libutil/realhostname.c
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@ -93,31 +93,47 @@ realhostname_sa(char *host, size_t hsize, struct sockaddr *addr, int addrlen)
{
int result, error;
char buf[NI_MAXHOST];
struct sockaddr_in sin;
result = HOSTNAME_INVALIDADDR;
error = getnameinfo(addr, addrlen, buf, sizeof(buf), NULL, 0, 0);
#ifdef INET6
/* IPv4 mapped IPv6 addr consideraton, specified in rfc2373. */
if (addr->sa_family == AF_INET6 &&
addrlen == sizeof(struct sockaddr_in6) &&
IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)addr)->sin6_addr)) {
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)addr;
memset(&sin, 0, sizeof(sin));
sin.sin_len = sizeof(struct sockaddr_in);
sin.sin_family = AF_INET;
sin.sin_port = sin6->sin6_port;
memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
sizeof(struct in_addr));
addr = (struct sockaddr *)&sin;
addrlen = sin.sin_len;
}
#endif
error = getnameinfo(addr, addrlen, buf, sizeof(buf), NULL, 0,
NI_WITHSCOPEID);
if (error == 0) {
struct addrinfo hints, *res, *ores;
struct sockaddr *sa;
memset(&hints, 0, sizeof(struct addrinfo));
switch (addr->sa_family) {
case AF_INET:
case AF_INET6:
hints.ai_family = addr->sa_family;
break;
default:
hints.ai_family = AF_UNSPEC;
break;
}
hints.ai_flags = AI_CANONNAME;
hints.ai_family = addr->sa_family;
hints.ai_flags = AI_CANONNAME | AI_PASSIVE;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(buf, NULL, &hints, &res);
if (error) {
result = HOSTNAME_INVALIDNAME;
goto numeric;
} else for (ores = res; ; res = res->ai_next) {
}
for (ores = res; ; res = res->ai_next) {
if (res == NULL) {
freeaddrinfo(ores);
result = HOSTNAME_INCORRECTNAME;
@ -131,15 +147,19 @@ realhostname_sa(char *host, size_t hsize, struct sockaddr *addr, int addrlen)
}
if (sa->sa_len == addrlen &&
sa->sa_family == addr->sa_family) {
u_int16_t port;
port = ((struct sockinet *)addr)->si_port;
((struct sockinet *)addr)->si_port = 0;
((struct sockinet *)sa)->si_port = ((struct sockinet *)addr)->si_port;
#ifdef INET6
/*
* XXX: sin6_socpe_id may not been
* filled by DNS
*/
if (sa->sa_family == AF_INET6 &&
((struct sockaddr_in6 *)sa)->sin6_scope_id == 0)
((struct sockaddr_in6 *)sa)->sin6_scope_id = ((struct sockaddr_in6 *)addr)->sin6_scope_id;
#endif
if (!memcmp(sa, addr, sa->sa_len)) {
result = HOSTNAME_FOUND;
((struct sockinet *)addr)->si_port =
port;
if (ores->ai_canonname == 0) {
if (ores->ai_canonname == NULL) {
freeaddrinfo(ores);
goto numeric;
}
@ -154,58 +174,11 @@ realhostname_sa(char *host, size_t hsize, struct sockaddr *addr, int addrlen)
strncpy(host, buf, hsize);
break;
}
((struct sockinet *)addr)->si_port = port;
}
#ifdef INET6
/*
* XXX IPv4 mapped IPv6 addr consideraton,
* specified in rfc2373.
*/
if (sa->sa_family == AF_INET &&
addr->sa_family == AF_INET6) {
struct in_addr *in;
struct in6_addr *in6;
in = &((struct sockaddr_in *)sa)->sin_addr;
in6 = &((struct sockaddr_in6 *)addr)->sin6_addr;
if (IN6_IS_ADDR_V4MAPPED(in6) &&
!memcmp(&in6->s6_addr[12], in,
sizeof(*in))) {
result = HOSTNAME_FOUND;
if (ores->ai_canonname == 0 ||
strlen(ores->ai_canonname) > hsize) {
freeaddrinfo(ores);
goto numeric;
}
strncpy(host, ores->ai_canonname,
hsize);
break;
}
}
#endif
}
freeaddrinfo(ores);
} else {
struct sockaddr_in sin;
numeric:
#ifdef INET6
if (addr->sa_family == AF_INET6) {
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)addr;
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
memset(&sin, 0, sizeof(sin));
sin.sin_len = sizeof(struct sockaddr_in);
sin.sin_family = AF_INET;
sin.sin_port = sin6->sin6_port;
memcpy(&sin.sin_addr,
&sin6->sin6_addr.s6_addr[12],
sizeof(struct in_addr));
addr = (struct sockaddr *)&sin;
addrlen = sin.sin_len;
}
}
#endif
if (getnameinfo(addr, addrlen, buf, sizeof(buf), NULL, 0,
NI_NUMERICHOST|NI_WITHSCOPEID) == 0)
strncpy(host, buf, hsize);