/* Return values:
* 0 : host found listed in dnsbl
* 1 : host not found listed in dnsbl
*/
int
check_dnsbl(int a, int b, int c, int d, char *dnsbl)
{
char *name;
int l, herr;
struct hostent *he;
/* An IPv4 address is max 15 chars long (xxx.xxx.xxx.xxx) */
l = 18 + strlen(dnsbl);
name = (char *)malloc(l);
if (name == NULL) {
syslog(LOG_INFO, "check_dnsbl(): malloc() error: aborting");
return(0);
}
memset(name, '\0', l);
if (*dnsbl == '.') {
sprintf(name, "%d.%d.%d.%d%s", d, c, b, a, dnsbl);
} else {
sprintf(name, "%d.%d.%d.%d.%s", d, c, b, a, dnsbl);
}
he = lwres_getipnodebyname(name, AF_INET, 0, &herr);
free(name);
if (he == NULL) {
return(1);
}
lwres_freehostent(he);
return(0);
}
/*% Looks for either an IPv4 or IPv6 address. */
struct hostent *
lwres_gethostbyname2(const char *name, int af) {
if (he != NULL)
lwres_freehostent(he);
he = lwres_getipnodebyname(name, af, 0, &lwres_h_errno);
return (he);
}
/*% Always looks for an IPv4 address. */
struct hostent *
lwres_gethostbyname(const char *name) {
if (he != NULL)
lwres_freehostent(he);
he = lwres_getipnodebyname(name, AF_INET, 0, &lwres_h_errno);
return (he);
}
/*% Thread-safe function for forward lookups. */
struct hostent *
lwres_gethostbyname_r(const char *name, struct hostent *resbuf,
char *buf, int buflen, int *error)
{
struct hostent *he;
int res;
he = lwres_getipnodebyname(name, AF_INET, 0, error);
if (he == NULL)
return (NULL);
res = copytobuf(he, resbuf, buf, buflen);
lwres_freehostent(he);
if (res != 0) {
errno = ERANGE;
return (NULL);
}
return (resbuf);
}
