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use source address as a hint to determine destination address.

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Obtained from:	KAME
This commit is contained in:
Hajimu UMEMOTO 2004-05-31 19:27:54 +00:00
parent 69af1dccdc
commit 4d489f472b
1 changed files with 111 additions and 0 deletions
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111
lib/libc/net/getaddrinfo.c
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@ -75,6 +75,7 @@ __FBSDID("$FreeBSD$");
#ifdef INET6
#include <net/if_var.h>
#include <sys/sysctl.h>
#include <sys/ioctl.h>
#include <netinet6/in6_var.h> /* XXX */
#endif
#include <arpa/inet.h>
@ -247,6 +248,7 @@ static int get_portmatch(const struct addrinfo *, const char *);
static int get_port(struct addrinfo *, const char *, int);
static const struct afd *find_afd(int);
static int addrconfig(struct addrinfo *);
static void set_source(struct ai_order *, struct policyhead *);
static int comp_dst(const void *, const void *);
#ifdef INET6
static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);
@ -261,6 +263,7 @@ static int get_addrselectpolicy(struct policyhead *);
static void free_addrselectpolicy(struct policyhead *);
static struct policyqueue *match_addrselectpolicy(struct sockaddr *,
struct policyhead *);
static int matchlen(struct sockaddr *, struct sockaddr *);
static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
const struct addrinfo *);
@ -677,6 +680,7 @@ reorder(sentinel)
aio[i].aio_dstscope = gai_addr2scopetype(ai->ai_addr);
aio[i].aio_dstpolicy = match_addrselectpolicy(ai->ai_addr,
&policyhead);
set_source(&aio[i], &policyhead);
}
/* perform sorting. */
@ -815,6 +819,113 @@ match_addrselectpolicy(addr, head)
}
static void
set_source(aio, ph)
struct ai_order *aio;
struct policyhead *ph;
{
struct addrinfo ai = *aio->aio_ai;
struct sockaddr_storage ss;
int s, srclen;
/* set unspec ("no source is available"), just in case */
aio->aio_srcsa.sa_family = AF_UNSPEC;
aio->aio_srcscope = -1;
switch(ai.ai_family) {
case AF_INET:
#ifdef INET6
case AF_INET6:
#endif
break;
default: /* ignore unsupported AFs explicitly */
return;
}
/* XXX: make a dummy addrinfo to call connect() */
ai.ai_socktype = SOCK_DGRAM;
ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */
ai.ai_next = NULL;
memset(&ss, 0, sizeof(ss));
memcpy(&ss, ai.ai_addr, ai.ai_addrlen);
ai.ai_addr = (struct sockaddr *)&ss;
get_port(&ai, "1", 0);
/* open a socket to get the source address for the given dst */
if ((s = _socket(ai.ai_family, ai.ai_socktype, ai.ai_protocol)) < 0)
return; /* give up */
if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0)
goto cleanup;
srclen = ai.ai_addrlen;
if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) {
aio->aio_srcsa.sa_family = AF_UNSPEC;
goto cleanup;
}
aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa);
aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph);
aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr);
#ifdef INET6
if (ai.ai_family == AF_INET6) {
struct in6_ifreq ifr6;
u_int32_t flags6;
/* XXX: interface name should not be hardcoded */
strncpy(ifr6.ifr_name, "lo0", sizeof(ifr6.ifr_name));
memset(&ifr6, 0, sizeof(ifr6));
memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen);
if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) {
flags6 = ifr6.ifr_ifru.ifru_flags6;
if ((flags6 & IN6_IFF_DEPRECATED))
aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED;
}
}
#endif
cleanup:
_close(s);
return;
}
static int
matchlen(src, dst)
struct sockaddr *src, *dst;
{
int match = 0;
u_char *s, *d;
u_char *lim, r;
int addrlen;
switch (src->sa_family) {
#ifdef INET6
case AF_INET6:
s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
addrlen = sizeof(struct in6_addr);
lim = s + addrlen;
break;
#endif
case AF_INET:
s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
addrlen = sizeof(struct in_addr);
lim = s + addrlen;
break;
default:
return(0);
}
while (s < lim)
if ((r = (*d++ ^ *s++)) != 0) {
while (r < addrlen * 8) {
match++;
r <<= 1;
}
break;
} else
match += 8;
return(match);
}
static int
comp_dst(arg1, arg2)
const void *arg1, *arg2;