enum nss_status _nss_myhostname_gethostbyname3_r(
const char *name,
int af,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop,
int32_t *ttlp,
char **canonp) {
char hn[HOST_NAME_MAX+1] = {};
struct address *addresses = NULL;
unsigned n_addresses = 0;
const char *canonical, *additional = NULL;
uint32_t local_address_ipv4;
if (af == AF_UNSPEC)
af = AF_INET;
if (af != AF_INET && af != AF_INET6) {
*errnop = EAFNOSUPPORT;
*h_errnop = NO_DATA;
return NSS_STATUS_UNAVAIL;
}
if (strcasecmp(name, "localhost") == 0) {
canonical = "localhost";
local_address_ipv4 = htonl(INADDR_LOOPBACK);
} else {
if (gethostname(hn, sizeof(hn)-1) < 0) {
*errnop = errno;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
if (strcasecmp(name, hn) != 0) {
*errnop = ENOENT;
*h_errnop = HOST_NOT_FOUND;
return NSS_STATUS_NOTFOUND;
}
ifconf_acquire_addresses(&addresses, &n_addresses);
canonical = hn;
additional = n_addresses <= 0 && af == AF_INET6 ? "localhost" : NULL;
local_address_ipv4 = LOCALADDRESS_IPV4;
}
return fill_in_hostent(
canonical, additional,
af,
addresses, n_addresses,
local_address_ipv4,
host,
buffer, buflen,
errnop, h_errnop,
ttlp,
canonp);
}
enum nss_status _nss_myhostname_gethostbyaddr2_r(
const void* addr, socklen_t len,
int af,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop,
int32_t *ttlp) {
const char *canonical = NULL, *additional = NULL;
uint32_t local_address_ipv4 = LOCALADDRESS_IPV4;
_cleanup_free_ struct local_address *addresses = NULL;
_cleanup_free_ char *hn = NULL;
int n_addresses = 0;
struct local_address *a;
bool additional_from_hostname = false;
unsigned n;
assert(addr);
assert(host);
assert(buffer);
assert(errnop);
assert(h_errnop);
if (!IN_SET(af, AF_INET, AF_INET6)) {
*errnop = EAFNOSUPPORT;
*h_errnop = NO_DATA;
return NSS_STATUS_UNAVAIL;
}
if (len != FAMILY_ADDRESS_SIZE(af)) {
*errnop = EINVAL;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
if (af == AF_INET) {
if ((*(uint32_t*) addr) == LOCALADDRESS_IPV4)
goto found;
if ((*(uint32_t*) addr) == htonl(INADDR_LOOPBACK)) {
canonical = "localhost";
local_address_ipv4 = htonl(INADDR_LOOPBACK);
goto found;
}
} else {
assert(af == AF_INET6);
if (memcmp(addr, LOCALADDRESS_IPV6, 16) == 0) {
canonical = "localhost";
additional_from_hostname = true;
goto found;
}
}
n_addresses = local_addresses(NULL, 0, AF_UNSPEC, &addresses);
if (n_addresses > 0) {
for (a = addresses, n = 0; (int) n < n_addresses; n++, a++) {
if (af != a->family)
continue;
if (memcmp(addr, &a->address, FAMILY_ADDRESS_SIZE(af)) == 0)
goto found;
}
}
addresses = mfree(addresses);
n_addresses = local_gateways(NULL, 0, AF_UNSPEC, &addresses);
if (n_addresses > 0) {
for (a = addresses, n = 0; (int) n < n_addresses; n++, a++) {
if (af != a->family)
continue;
if (memcmp(addr, &a->address, FAMILY_ADDRESS_SIZE(af)) == 0) {
canonical = "gateway";
goto found;
}
}
}
*errnop = ENOENT;
*h_errnop = HOST_NOT_FOUND;
return NSS_STATUS_NOTFOUND;
found:
if (!canonical || (!additional && additional_from_hostname)) {
hn = gethostname_malloc();
if (!hn) {
*errnop = ENOMEM;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_TRYAGAIN;
}
if (!canonical)
canonical = hn;
if (!additional && additional_from_hostname)
additional = hn;
}
return fill_in_hostent(
canonical, additional,
af,
addresses, n_addresses,
local_address_ipv4,
host,
buffer, buflen,
errnop, h_errnop,
ttlp,
NULL);
}
enum nss_status _nss_myhostname_gethostbyname3_r(
const char *name,
int af,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop,
int32_t *ttlp,
char **canonp) {
_cleanup_free_ struct local_address *addresses = NULL;
const char *canonical, *additional = NULL;
_cleanup_free_ char *hn = NULL;
uint32_t local_address_ipv4 = 0;
int n_addresses = 0;
assert(name);
assert(host);
assert(buffer);
assert(errnop);
assert(h_errnop);
if (af == AF_UNSPEC)
af = AF_INET;
if (af != AF_INET && af != AF_INET6) {
*errnop = EAFNOSUPPORT;
*h_errnop = NO_DATA;
return NSS_STATUS_UNAVAIL;
}
if (is_localhost(name)) {
canonical = "localhost";
local_address_ipv4 = htonl(INADDR_LOOPBACK);
} else if (is_gateway_hostname(name)) {
n_addresses = local_gateways(NULL, 0, af, &addresses);
if (n_addresses <= 0) {
*errnop = ENOENT;
*h_errnop = HOST_NOT_FOUND;
return NSS_STATUS_NOTFOUND;
}
canonical = "gateway";
} else {
hn = gethostname_malloc();
if (!hn) {
*errnop = ENOMEM;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_TRYAGAIN;
}
if (!streq(name, hn) && !streq_ptr(startswith(name, hn), ".")) {
*errnop = ENOENT;
*h_errnop = HOST_NOT_FOUND;
return NSS_STATUS_NOTFOUND;
}
n_addresses = local_addresses(NULL, 0, af, &addresses);
if (n_addresses < 0)
n_addresses = 0;
canonical = hn;
additional = n_addresses <= 0 && af == AF_INET6 ? "localhost" : NULL;
local_address_ipv4 = LOCALADDRESS_IPV4;
}
return fill_in_hostent(
canonical, additional,
af,
addresses, n_addresses,
local_address_ipv4,
host,
buffer, buflen,
errnop, h_errnop,
ttlp,
canonp);
}
enum nss_status _nss_myhostname_gethostbyaddr2_r(
const void* addr, socklen_t len,
int af,
struct hostent *host,
char *buffer, size_t buflen,
int *errnop, int *h_errnop,
int32_t *ttlp) {
char hn[HOST_NAME_MAX+1] = {};
struct address *addresses = NULL;
struct address *a;
unsigned n_addresses = 0, n;
uint32_t local_address_ipv4 = LOCALADDRESS_IPV4;
const char *canonical = NULL, *additional = NULL;
if (len != PROTO_ADDRESS_SIZE(af)) {
*errnop = EINVAL;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
if (af == AF_INET) {
if ((*(uint32_t*) addr) == LOCALADDRESS_IPV4)
goto found;
if ((*(uint32_t*) addr) == htonl(INADDR_LOOPBACK)) {
canonical = "localhost";
local_address_ipv4 = htonl(INADDR_LOOPBACK);
goto found;
}
} else if (af == AF_INET6) {
if (memcmp(addr, LOCALADDRESS_IPV6, 16) == 0) {
additional = "localhost";
goto found;
}
} else {
*errnop = EAFNOSUPPORT;
*h_errnop = NO_DATA;
return NSS_STATUS_UNAVAIL;
}
ifconf_acquire_addresses(&addresses, &n_addresses);
for (a = addresses, n = 0; n < n_addresses; n++, a++) {
if (af != a->family)
continue;
if (memcmp(addr, a->address, PROTO_ADDRESS_SIZE(af)) == 0)
goto found;
}
*errnop = ENOENT;
*h_errnop = HOST_NOT_FOUND;
free(addresses);
return NSS_STATUS_NOTFOUND;
found:
if (!canonical) {
if (gethostname(hn, sizeof(hn)-1) < 0) {
*errnop = errno;
*h_errnop = NO_RECOVERY;
free(addresses);
return NSS_STATUS_UNAVAIL;
}
canonical = hn;
}
return fill_in_hostent(
canonical, additional,
af,
addresses, n_addresses,
local_address_ipv4,
host,
buffer, buflen,
errnop, h_errnop,
ttlp,
NULL);
}
