struct hostent *
netsnmp_gethostbyaddr(const void *addr, socklen_t len, int type)
{
#if HAVE_GETHOSTBYADDR
struct hostent *hp = NULL;
struct sockaddr_in *saddr_in =
NETSNMP_REMOVE_CONST(struct sockaddr_in *,addr);
DEBUGMSGTL(("dns:gethostbyaddr", "resolving { AF_INET, %s:%hu }\n",
inet_ntoa(saddr_in->sin_addr), ntohs(saddr_in->sin_port)));
#ifdef DNSSEC_LOCAL_VALIDATION
val_status_t val_status;
hp = val_gethostbyaddr(netsnmp_validator_context(),
(const void*)&saddr_in->sin_addr,
sizeof(struct in_addr), AF_INET, &val_status);
DEBUGMSGTL(("dns:sec:val", "val_status %d / %s; trusted: %d\n",
val_status, p_val_status(val_status),
val_istrusted(val_status)));
if (!val_istrusted(val_status)) {
snmp_log(LOG_WARNING,
"The authenticity of DNS response is not trusted (%s)\n",
p_val_status(val_status));
/** continue anyways if DNSSEC_WARN_ONLY is set */
if (!netsnmp_ds_get_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DNSSEC_WARN_ONLY))
hp = NULL;
}
else if (val_does_not_exist(val_status) && hp)
hp = NULL;
#else
hp = gethostbyaddr((const void*) &saddr_in->sin_addr,
sizeof(struct in_addr), AF_INET);
#endif
if (hp == NULL) {
DEBUGMSGTL(("dns:gethostbyaddr", "couldn't resolve addr\n"));
} else if (hp->h_addrtype != AF_INET) {
DEBUGMSGTL(("dns:gethostbyaddr",
"warning: response for addr not AF_INET!\n"));
} else {
DEBUGMSGTL(("dns:gethostbyaddr", "addr resolved okay\n"));
}
return hp;
#else
NETSNMP_LOGONCE((LOG_ERR, "gethostbyaddr not available"));
return NULL;
#endif
}
char *
AddrToAddrStr(char *const dst, size_t dsize, struct sockaddr_in * const saddrp, int dns, const char *fmt)
{
char addrName[128];
char *addrNamePtr;
struct hostent *hp;
char str[128];
char s_name[64];
char *dlim, *dp;
const char *cp;
if (dsize == 0)
return NULL;
memset(dst, 0, dsize);
addrNamePtr = NULL;
if (dns == 0)
{
InetNtoA(addrName, &saddrp->sin_addr, sizeof(addrName));
addrNamePtr = addrName;
}
else
{
#ifdef DNSSEC_LOCAL_VALIDATION
val_status_t val_status;
hp = val_gethostbyaddr(NULL, (const char*)&saddrp->sin_addr, sizeof(struct in_addr), AF_INET, &val_status);
if ((hp != NULL) && (!val_istrusted(val_status)))
hp = NULL;
#else
hp = gethostbyaddr((gethost_addrptr_t) &saddrp->sin_addr, sizeof(struct in_addr), AF_INET);
#endif
if ((hp != NULL) && (hp->h_name != NULL) && (hp->h_name[0] != '\0'))
{
addrNamePtr = hp->h_name;
}
else
{
InetNtoA(addrName, &saddrp->sin_addr, sizeof(addrName));
addrNamePtr = addrName;
}
}
if (fmt == NULL)
fmt = "%h:%p";
for (dp = dst, dlim = dp + dsize - 1; ; fmt++)
{
if (*fmt == '\0')
{
break; /* done */
}
else if (*fmt == '%')
{
fmt++;
if (*fmt == '%')
{
if (dp < dlim)
*dp++ = '%';
}
else if (*fmt == 'p')
{
sprintf(str, "%u", (unsigned int) ntohs(saddrp->sin_port));
for (cp = str; *cp != '\0'; cp++)
if (dp < dlim)
*dp++ = *cp;
*dp = '\0';
}
else if (*fmt == 'h')
{
if (addrNamePtr != NULL)
{
cp = addrNamePtr;
}
else
{
cp = "unknown";
}
for ( ; *cp != '\0'; cp++)
if (dp < dlim)
*dp++ = *cp;
*dp = '\0';
}
else if (*fmt == 's')
{
cp = s_name;
(void) ServicePortNumberToName(ntohs(saddrp->sin_port), s_name, sizeof(s_name), 0);
for ( ; *cp != '\0'; cp++)
if (dp < dlim)
*dp++ = *cp;
/* endservent(); */
*dp = '\0';
}
else if ((*fmt == 't') || (*fmt == 'u'))
{
cp = s_name;
(void) ServicePortNumberToName(ntohs(saddrp->sin_port), s_name, sizeof(s_name), (int) *fmt);
for ( ; *cp != '\0'; cp++)
if (dp < dlim)
*dp++ = *cp;
/* endservent(); */
*dp = '\0';
}
else if (*fmt == '\0')
{
break;
}
else
{
if (dp < dlim)
*dp++ = *fmt;
}
}
else if (dp < dlim)
{
*dp++ = *fmt;
}
}
*dp = '\0';
return (dst);
} /* AddrToAddrStr */
