static void
test_gnba(const char *target, lwres_uint32_t af) {
lwres_gnbaresponse_t *res;
int ret;
unsigned int i;
unsigned char addrbuf[16];
unsigned int len;
if (af == LWRES_ADDRTYPE_V4) {
len = 4;
ret = inet_pton(AF_INET, target, addrbuf);
assert(ret == 1);
} else {
len = 16;
ret = inet_pton(AF_INET6, target, addrbuf);
assert(ret == 1);
}
res = NULL;
ret = lwres_getnamebyaddr(ctx, af, len, addrbuf, &res);
printf("gnba %s ret == %d\n", target, ret);
assert(ret == 0);
assert(res != NULL);
printf("Returned real name: (%u, %s)\n",
res->realnamelen, res->realname);
printf("%u aliases:\n", res->naliases);
for (i = 0; i < res->naliases; i++)
printf("\t(%u, %s)\n", res->aliaslen[i], res->aliases[i]);
lwres_gnbaresponse_free(ctx, &res);
}
static void
test_gnba(const char *target, lwres_uint32_t af, lwres_result_t expected,
const char *name)
{
lwres_gnbaresponse_t *res;
lwres_result_t ret;
unsigned char addrbuf[16];
unsigned int len;
if (af == LWRES_ADDRTYPE_V4) {
len = 4;
ret = inet_pton(AF_INET, target, addrbuf);
assert(ret == 1);
} else {
len = 16;
ret = inet_pton(AF_INET6, target, addrbuf);
assert(ret == 1);
}
res = NULL;
ret = lwres_getnamebyaddr(ctx, af, len, addrbuf, &res);
if (ret != expected) {
printf("I:gnba(%s) failed: %d\n", target, ret);
if (res != NULL)
lwres_gnbaresponse_free(ctx, &res);
fails++;
return;
}
if (ret == LWRES_R_SUCCESS && strcasecmp(res->realname, name) != 0) {
printf("I:gnba(%s) returned %s, expected %s\n",
target, res->realname, name);
fails++;
return;
}
if (res != NULL)
lwres_gnbaresponse_free(ctx, &res);
}
/*% performs a reverse lookup of address src which is len bytes long. af denotes the protocol family, typically #PF_INET or PF_INET6. */
struct hostent *
lwres_getipnodebyaddr(const void *src, size_t len, int af, int *error_num) {
struct hostent *he1, *he2;
lwres_context_t *lwrctx = NULL;
lwres_gnbaresponse_t *by = NULL;
lwres_result_t n;
union {
const void *konst;
struct in6_addr *in6;
} u;
/*
* Sanity checks.
*/
if (src == NULL) {
*error_num = NO_RECOVERY;
return (NULL);
}
switch (af) {
case AF_INET:
if (len != (unsigned int)INADDRSZ) {
*error_num = NO_RECOVERY;
return (NULL);
}
break;
case AF_INET6:
if (len != (unsigned int)IN6ADDRSZ) {
*error_num = NO_RECOVERY;
return (NULL);
}
break;
default:
*error_num = NO_RECOVERY;
return (NULL);
}
/*
* The de-"const"-ing game is done because at least one
* vendor's system (RedHat 6.0) defines the IN6_IS_ADDR_*
* macros in such a way that they discard the const with
* internal casting, and gcc ends up complaining. Rather
* than replacing their own (possibly optimized) definitions
* with our own, cleanly discarding the const is the easiest
* thing to do.
*/
u.konst = src;
/*
* Look up IPv4 and IPv4 mapped/compatible addresses.
*/
if ((af == AF_INET6 && IN6_IS_ADDR_V4COMPAT(u.in6)) ||
(af == AF_INET6 && IN6_IS_ADDR_V4MAPPED(u.in6)) ||
(af == AF_INET)) {
const unsigned char *cp = src;
if (af == AF_INET6)
cp += 12;
n = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
if (n == LWRES_R_SUCCESS)
(void) lwres_conf_parse(lwrctx, lwres_resolv_conf);
if (n == LWRES_R_SUCCESS)
n = lwres_getnamebyaddr(lwrctx, LWRES_ADDRTYPE_V4,
INADDRSZ, cp, &by);
if (n != LWRES_R_SUCCESS) {
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
if (n == LWRES_R_NOTFOUND)
*error_num = HOST_NOT_FOUND;
else
*error_num = NO_RECOVERY;
return (NULL);
}
he1 = hostfromaddr(by, AF_INET, cp);
lwres_gnbaresponse_free(lwrctx, &by);
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
if (af != AF_INET6)
return (he1);
/*
* Convert from AF_INET to AF_INET6.
*/
he2 = copyandmerge(he1, NULL, af, error_num);
lwres_freehostent(he1);
if (he2 == NULL)
return (NULL);
/*
* Restore original address.
*/
memcpy(he2->h_addr, src, len);
return (he2);
}
/*
* Lookup IPv6 address.
*/
if (memcmp(src, &in6addr_any, IN6ADDRSZ) == 0) {
*error_num = HOST_NOT_FOUND;
return (NULL);
}
n = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
if (n == LWRES_R_SUCCESS)
(void) lwres_conf_parse(lwrctx, lwres_resolv_conf);
if (n == LWRES_R_SUCCESS)
n = lwres_getnamebyaddr(lwrctx, LWRES_ADDRTYPE_V6, IN6ADDRSZ,
src, &by);
if (n != 0) {
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
if (n == LWRES_R_NOTFOUND)
*error_num = HOST_NOT_FOUND;
else
*error_num = NO_RECOVERY;
return (NULL);
}
he1 = hostfromaddr(by, AF_INET6, src);
lwres_gnbaresponse_free(lwrctx, &by);
if (he1 == NULL)
*error_num = NO_RECOVERY;
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
return (he1);
}
