#include <stdlib.h>
#include <arpa/inet.h>
-#include "ifconf.h"
+#include "local-addresses.h"
#include "macro.h"
-
-/* Ensure that glibc's assert is used. We cannot use assert from macro.h, as
- * libnss_myhostname will be linked into arbitrary programs which will, in turn
- * attempt to write to the journal via log_dispatch() */
-#include <assert.h>
+#include "nss-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
#define LOCALADDRESS_IPV6 &in6addr_loopback
#define LOOPBACK_INTERFACE "lo"
-enum nss_status _nss_myhostname_gethostbyname4_r(
- const char *name,
- struct gaih_addrtuple **pat,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop,
- int32_t *ttlp) _public_;
-
-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) _public_;
-
-enum nss_status _nss_myhostname_gethostbyname2_r(
- const char *name,
- int af,
- struct hostent *host,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop) _public_;
-
-enum nss_status _nss_myhostname_gethostbyname_r(
- const char *name,
- struct hostent *host,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop) _public_;
-
-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) _public_;
-
-enum nss_status _nss_myhostname_gethostbyaddr_r(
- const void* addr, socklen_t len,
- int af,
- struct hostent *host,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop) _public_;
+NSS_GETHOSTBYNAME_PROTOTYPES(myhostname);
+NSS_GETHOSTBYADDR_PROTOTYPES(myhostname);
enum nss_status _nss_myhostname_gethostbyname4_r(
const char *name,
int *errnop, int *h_errnop,
int32_t *ttlp) {
- unsigned lo_ifi;
- char hn[HOST_NAME_MAX+1] = {};
+ struct gaih_addrtuple *r_tuple, *r_tuple_prev = NULL;
+ _cleanup_free_ struct local_address *addresses = NULL;
+ _cleanup_free_ char *hn = NULL;
const char *canonical = NULL;
+ int n_addresses = 0, lo_ifi;
+ uint32_t local_address_ipv4;
+ struct local_address *a;
size_t l, idx, ms;
char *r_name;
- struct gaih_addrtuple *r_tuple, *r_tuple_prev = NULL;
- struct address *addresses = NULL, *a;
- unsigned n_addresses = 0, n;
- uint32_t local_address_ipv4;
+ unsigned n;
+
+ assert(name);
+ assert(pat);
+ assert(buffer);
+ assert(errnop);
+ assert(h_errnop);
- if (strcasecmp(name, "localhost") == 0) {
+ if (is_localhost(name)) {
/* We respond to 'localhost', so that /etc/hosts
* is optional */
canonical = "localhost";
local_address_ipv4 = htonl(INADDR_LOOPBACK);
} else {
- /* We respond to our local host name */
-
- if (gethostname(hn, sizeof(hn)-1) < 0) {
- *errnop = errno;
+ hn = gethostname_malloc();
+ if (!hn) {
+ *errnop = ENOMEM;
*h_errnop = NO_RECOVERY;
- return NSS_STATUS_UNAVAIL;
+ return NSS_STATUS_TRYAGAIN;
}
- if (strcasecmp(name, hn) != 0) {
+ /* We respond to our local host name, our our hostname suffixed with a single dot. */
+ if (!streq(name, hn) && !streq_ptr(startswith(name, hn), ".")) {
*errnop = ENOENT;
*h_errnop = HOST_NOT_FOUND;
return NSS_STATUS_NOTFOUND;
}
- /* If this fails, n_addresses is 0. Which is fine */
- ifconf_acquire_addresses(&addresses, &n_addresses);
+ n_addresses = local_addresses(NULL, 0, &addresses);
+ if (n_addresses < 0)
+ n_addresses = 0;
canonical = hn;
local_address_ipv4 = LOCALADDRESS_IPV4;
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);
+ ms = ALIGN(l+1) + ALIGN(sizeof(struct gaih_addrtuple)) * (n_addresses > 0 ? n_addresses : 2);
if (buflen < ms) {
*errnop = ENOMEM;
*h_errnop = NO_RECOVERY;
- free(addresses);
return NSS_STATUS_TRYAGAIN;
}
}
/* Fourth, fill actual addresses in, but in backwards order */
- for (a = addresses + n_addresses - 1, n = 0; n < n_addresses; n++, a--) {
+ for (a = addresses + n_addresses - 1, n = 0; (int) n < n_addresses; n++, a--) {
r_tuple = (struct gaih_addrtuple*) (buffer + idx);
r_tuple->next = r_tuple_prev;
r_tuple->name = r_name;
r_tuple->family = a->family;
r_tuple->scopeid = a->ifindex;
- memcpy(r_tuple->addr, a->address, 16);
+ memcpy(r_tuple->addr, &a->address, 16);
idx += ALIGN(sizeof(struct gaih_addrtuple));
r_tuple_prev = r_tuple;
if (ttlp)
*ttlp = 0;
- free(addresses);
+ /* Explicitly reset all error variables */
+ *errnop = 0;
+ *h_errnop = NETDB_SUCCESS;
+ h_errno = 0;
return NSS_STATUS_SUCCESS;
}
static enum nss_status fill_in_hostent(
const char *canonical, const char *additional,
int af,
- struct address *addresses, unsigned n_addresses,
+ struct local_address *addresses, unsigned n_addresses,
uint32_t local_address_ipv4,
struct hostent *result,
char *buffer, size_t buflen,
int32_t *ttlp,
char **canonp) {
- size_t l_canonical, l_additional, idx, ms;
+ size_t l_canonical, l_additional, idx, ms, alen;
char *r_addr, *r_name, *r_aliases, *r_alias = NULL, *r_addr_list;
- size_t alen;
- struct address *a;
+ struct local_address *a;
unsigned n, c;
- alen = PROTO_ADDRESS_SIZE(af);
+ assert(canonical);
+ assert(result);
+ assert(buffer);
+ assert(errnop);
+ assert(h_errnop);
+
+ alen = FAMILY_ADDRESS_SIZE(af);
for (a = addresses, n = 0, c = 0; n < n_addresses; a++, n++)
if (af == a->family)
l_additional = additional ? strlen(additional) : 0;
ms = ALIGN(l_canonical+1)+
(additional ? ALIGN(l_additional+1) : 0) +
- sizeof(char*)+
+ sizeof(char*) +
(additional ? sizeof(char*) : 0) +
- (c > 0 ? c : 1)*ALIGN(alen)+
- (c > 0 ? c+1 : 2)*sizeof(char*);
+ (c > 0 ? c : 1) * ALIGN(alen) +
+ (c > 0 ? c+1 : 2) * sizeof(char*);
if (buflen < ms) {
*errnop = ENOMEM;
*h_errnop = NO_RECOVERY;
- free(addresses);
return NSS_STATUS_TRYAGAIN;
}
if (af != a->family)
continue;
- memcpy(r_addr + i*ALIGN(alen), a->address, alen);
+ memcpy(r_addr + i*ALIGN(alen), &a->address, alen);
i++;
}
/* Fourth, add address pointer array */
r_addr_list = buffer + idx;
if (c > 0) {
- unsigned i = 0;
-
- for (a = addresses, n = 0; n < n_addresses; a++, n++) {
- if (af != a->family)
- continue;
+ unsigned i;
- ((char**) r_addr_list)[i] = (r_addr + i*ALIGN(alen));
- i++;
- }
+ for (i = 0; i < c; i++)
+ ((char**) r_addr_list)[i] = r_addr + i*ALIGN(alen);
- assert(i == c);
- ((char**) r_addr_list)[c] = NULL;
- idx += (c+1)*sizeof(char*);
+ ((char**) r_addr_list)[i] = NULL;
+ idx += (c+1) * sizeof(char*);
} else {
((char**) r_addr_list)[0] = r_addr;
((char**) r_addr_list)[1] = NULL;
- idx += 2*sizeof(char*);
+ idx += 2 * sizeof(char*);
}
/* Verify the size matches */
if (canonp)
*canonp = r_name;
- free(addresses);
+ /* Explicitly reset all error variables */
+ *errnop = 0;
+ *h_errnop = NETDB_SUCCESS;
+ h_errno = 0;
return NSS_STATUS_SUCCESS;
}
int32_t *ttlp,
char **canonp) {
- char hn[HOST_NAME_MAX+1] = {};
- struct address *addresses = NULL;
- unsigned n_addresses = 0;
+ _cleanup_free_ struct local_address *addresses = NULL;
const char *canonical, *additional = NULL;
+ _cleanup_free_ char *hn = NULL;
uint32_t local_address_ipv4;
+ int n_addresses = 0;
+
+ assert(name);
+ assert(host);
+ assert(buffer);
+ assert(errnop);
+ assert(h_errnop);
if (af == AF_UNSPEC)
af = AF_INET;
return NSS_STATUS_UNAVAIL;
}
- if (strcasecmp(name, "localhost") == 0) {
+ if (is_localhost(name)) {
canonical = "localhost";
local_address_ipv4 = htonl(INADDR_LOOPBACK);
} else {
- if (gethostname(hn, sizeof(hn)-1) < 0) {
- *errnop = errno;
+ hn = gethostname_malloc();
+ if (!hn) {
+ *errnop = ENOMEM;
*h_errnop = NO_RECOVERY;
- return NSS_STATUS_UNAVAIL;
+ return NSS_STATUS_TRYAGAIN;
}
- if (strcasecmp(name, hn) != 0) {
+ if (!streq(name, hn) && !streq_ptr(startswith(name, hn), ".")) {
*errnop = ENOENT;
*h_errnop = HOST_NOT_FOUND;
return NSS_STATUS_NOTFOUND;
}
- ifconf_acquire_addresses(&addresses, &n_addresses);
+ n_addresses = local_addresses(NULL, 0, &addresses);
+ if (n_addresses < 0)
+ n_addresses = 0;
canonical = hn;
additional = n_addresses <= 0 && af == AF_INET6 ? "localhost" : NULL;
canonp);
}
-enum nss_status _nss_myhostname_gethostbyname2_r(
- const char *name,
- int af,
- struct hostent *host,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop) {
-
- return _nss_myhostname_gethostbyname3_r(
- name,
- af,
- host,
- buffer, buflen,
- errnop, h_errnop,
- NULL,
- NULL);
-}
-
-enum nss_status _nss_myhostname_gethostbyname_r(
- const char *name,
- struct hostent *host,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop) {
-
- return _nss_myhostname_gethostbyname3_r(
- name,
- AF_UNSPEC,
- host,
- buffer, buflen,
- errnop, h_errnop,
- NULL,
- NULL);
-}
-
enum nss_status _nss_myhostname_gethostbyaddr2_r(
const void* addr, socklen_t len,
int af,
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;
+ 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;
+ 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 != PROTO_ADDRESS_SIZE(af)) {
+ if (len != FAMILY_ADDRESS_SIZE(af)) {
*errnop = EINVAL;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
goto found;
}
- } else if (af == AF_INET6) {
+ } else {
+ assert(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);
+ n_addresses = local_addresses(NULL, 0, &addresses);
+ if (n_addresses < 0)
+ n_addresses = 0;
- for (a = addresses, n = 0; n < n_addresses; n++, a++) {
+ for (a = addresses, n = 0; (int) n < n_addresses; n++, a++) {
if (af != a->family)
continue;
- if (memcmp(addr, a->address, PROTO_ADDRESS_SIZE(af)) == 0)
+ if (memcmp(addr, &a->address, FAMILY_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;
+ hn = gethostname_malloc();
+ if (!hn) {
+ *errnop = ENOMEM;
*h_errnop = NO_RECOVERY;
-
- free(addresses);
-
- return NSS_STATUS_UNAVAIL;
+ return NSS_STATUS_TRYAGAIN;
}
canonical = hn;
}
-enum nss_status _nss_myhostname_gethostbyaddr_r(
- const void* addr, socklen_t len,
- int af,
- struct hostent *host,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop) {
-
- return _nss_myhostname_gethostbyaddr2_r(
- addr, len,
- af,
- host,
- buffer, buflen,
- errnop, h_errnop,
- NULL);
-}
+NSS_GETHOSTBYNAME_FALLBACKS(myhostname);
+NSS_GETHOSTBYADDR_FALLBACKS(myhostname);
~ianmdlvl / elogind.git / blobdiff