-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
+/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include <limits.h>
-#include <nss.h>
-#include <sys/types.h>
-#include <netdb.h>
#include <errno.h>
-#include <string.h>
-#include <unistd.h>
#include <net/if.h>
+#include <netdb.h>
+#include <nss.h>
#include <stdlib.h>
-#include <arpa/inet.h>
+#include <string.h>
+#include "alloc-util.h"
+#include "hostname-util.h"
#include "local-addresses.h"
#include "macro.h"
#include "nss-util.h"
+#include "signal-util.h"
+#include "string-util.h"
#include "util.h"
/* We use 127.0.0.2 as IPv4 address. This has the advantage over
* 127.0.0.1 that it can be translated back to the local hostname. For
* IPv6 we use ::1 which unfortunately will not translate back to the
- * hostname but instead something like "localhost6" or so. */
+ * hostname but instead something like "localhost" or so. */
-#define LOCALADDRESS_IPV4 (htonl(0x7F000002))
+#define LOCALADDRESS_IPV4 (htobe32(0x7F000002))
#define LOCALADDRESS_IPV6 &in6addr_loopback
-#define LOOPBACK_INTERFACE "lo"
NSS_GETHOSTBYNAME_PROTOTYPES(myhostname);
NSS_GETHOSTBYADDR_PROTOTYPES(myhostname);
_cleanup_free_ struct local_address *addresses = NULL;
_cleanup_free_ char *hn = NULL;
const char *canonical = NULL;
- int n_addresses = 0, lo_ifi;
+ int n_addresses = 0;
uint32_t local_address_ipv4;
struct local_address *a;
size_t l, idx, ms;
char *r_name;
unsigned n;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(name);
assert(pat);
assert(buffer);
* is optional */
canonical = "localhost";
- local_address_ipv4 = htonl(INADDR_LOOPBACK);
+ local_address_ipv4 = htobe32(INADDR_LOOPBACK);
- } else if (streq(name, "gateway") || streq(name, "gateway.")) {
+ } else if (is_gateway_hostname(name)) {
n_addresses = local_gateways(NULL, 0, AF_UNSPEC, &addresses);
if (n_addresses <= 0) {
return NSS_STATUS_NOTFOUND;
}
- canonical = "gateway";
+ canonical = "_gateway";
} else {
hn = gethostname_malloc();
return NSS_STATUS_TRYAGAIN;
}
- /* We respond to our local host name, our our hostname suffixed with a single dot. */
+ /* We respond to our local host name, our hostname suffixed with a single dot. */
if (!streq(name, hn) && !streq_ptr(startswith(name, hn), ".")) {
*errnop = ENOENT;
*h_errnop = HOST_NOT_FOUND;
local_address_ipv4 = LOCALADDRESS_IPV4;
}
- /* If this call fails we fill in 0 as scope. Which is fine */
- lo_ifi = n_addresses <= 0 ? if_nametoindex(LOOPBACK_INTERFACE) : 0;
-
l = strlen(canonical);
ms = ALIGN(l+1) + ALIGN(sizeof(struct gaih_addrtuple)) * (n_addresses > 0 ? n_addresses : 2);
if (buflen < ms) {
- *errnop = ENOMEM;
- *h_errnop = NO_RECOVERY;
+ *errnop = ERANGE;
+ *h_errnop = NETDB_INTERNAL;
return NSS_STATUS_TRYAGAIN;
}
memcpy(r_name, canonical, l+1);
idx = ALIGN(l+1);
- if (n_addresses <= 0) {
+ assert(n_addresses >= 0);
+ if (n_addresses == 0) {
/* Second, fill in IPv6 tuple */
r_tuple = (struct gaih_addrtuple*) (buffer + idx);
r_tuple->next = r_tuple_prev;
r_tuple->name = r_name;
r_tuple->family = AF_INET6;
memcpy(r_tuple->addr, LOCALADDRESS_IPV6, 16);
- r_tuple->scopeid = (uint32_t) lo_ifi;
+ r_tuple->scopeid = 0;
idx += ALIGN(sizeof(struct gaih_addrtuple));
r_tuple_prev = r_tuple;
r_tuple->name = r_name;
r_tuple->family = AF_INET;
*(uint32_t*) r_tuple->addr = local_address_ipv4;
- r_tuple->scopeid = (uint32_t) lo_ifi;
+ r_tuple->scopeid = 0;
idx += ALIGN(sizeof(struct gaih_addrtuple));
r_tuple_prev = r_tuple;
r_tuple->next = r_tuple_prev;
r_tuple->name = r_name;
r_tuple->family = a->family;
- r_tuple->scopeid = a->ifindex;
+ r_tuple->scopeid = a->family == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&a->address.in6) ? a->ifindex : 0;
memcpy(r_tuple->addr, &a->address, 16);
idx += ALIGN(sizeof(struct gaih_addrtuple));
c++;
l_canonical = strlen(canonical);
- l_additional = additional ? strlen(additional) : 0;
+ l_additional = strlen_ptr(additional);
ms = ALIGN(l_canonical+1)+
(additional ? ALIGN(l_additional+1) : 0) +
sizeof(char*) +
(c > 0 ? c+1 : 2) * sizeof(char*);
if (buflen < ms) {
- *errnop = ENOMEM;
- *h_errnop = NO_RECOVERY;
+ *errnop = ERANGE;
+ *h_errnop = NETDB_INTERNAL;
return NSS_STATUS_TRYAGAIN;
}
uint32_t local_address_ipv4 = 0;
int n_addresses = 0;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(name);
assert(host);
assert(buffer);
if (af == AF_UNSPEC)
af = AF_INET;
- if (af != AF_INET && af != AF_INET6) {
+ if (!IN_SET(af, AF_INET, AF_INET6)) {
*errnop = EAFNOSUPPORT;
*h_errnop = NO_DATA;
return NSS_STATUS_UNAVAIL;
if (is_localhost(name)) {
canonical = "localhost";
- local_address_ipv4 = htonl(INADDR_LOOPBACK);
+ local_address_ipv4 = htobe32(INADDR_LOOPBACK);
- } else if (streq(name, "gateway") || streq(name, "gateway.")) {
+ } else if (is_gateway_hostname(name)) {
n_addresses = local_gateways(NULL, 0, af, &addresses);
if (n_addresses <= 0) {
return NSS_STATUS_NOTFOUND;
}
- canonical = "gateway";
+ canonical = "_gateway";
} else {
hn = gethostname_malloc();
_cleanup_free_ char *hn = NULL;
int n_addresses = 0;
struct local_address *a;
+ bool additional_from_hostname = false;
unsigned n;
+ BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
assert(addr);
assert(host);
assert(buffer);
}
if (af == AF_INET) {
-
if ((*(uint32_t*) addr) == LOCALADDRESS_IPV4)
goto found;
- if ((*(uint32_t*) addr) == htonl(INADDR_LOOPBACK)) {
+ if ((*(uint32_t*) addr) == htobe32(INADDR_LOOPBACK)) {
canonical = "localhost";
- local_address_ipv4 = htonl(INADDR_LOOPBACK);
+ local_address_ipv4 = htobe32(INADDR_LOOPBACK);
goto found;
}
assert(af == AF_INET6);
if (memcmp(addr, LOCALADDRESS_IPV6, 16) == 0) {
- additional = "localhost";
+ 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;
+ 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) {
-
- hn = gethostname_malloc();
- if (!hn) {
- *errnop = ENOMEM;
- *h_errnop = NO_RECOVERY;
- return NSS_STATUS_TRYAGAIN;
- }
-
- canonical = hn;
- goto found;
- }
- }
+ if (memcmp(addr, &a->address, FAMILY_ADDRESS_SIZE(af)) == 0)
+ goto found;
}
- free(addresses);
- addresses = NULL;
+ 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) {
+ for (a = addresses, n = 0; (int) n < n_addresses; n++, a++) {
+ if (af != a->family)
+ continue;
- canonical = "gateway";
- goto found;
- }
+ 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_from_hostname) {
+ hn = gethostname_malloc();
+ if (!hn) {
+ *errnop = ENOMEM;
+ *h_errnop = NO_RECOVERY;
+ return NSS_STATUS_TRYAGAIN;
+ }
+
+ if (!canonical)
+ canonical = hn;
+ else
+ additional = hn;
+ }
return fill_in_hostent(
canonical, additional,
errnop, h_errnop,
ttlp,
NULL);
-
}
NSS_GETHOSTBYNAME_FALLBACKS(myhostname);
projects / thirdparty / systemd.git / blobdiff