Parts taken from: nss.c in nss-mdns
nss-mdns is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published
- by the Free Software Foundation; either version 2 of the License,
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
-
+
nss-mdns is distributed in the hope that it will be useful, but1
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
-
+
You should have received a copy of the GNU Lesser General Public License
along with nss-mdns; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
USA.
***/
} while(0)
-/**
- * function to check if name ends with a specific suffix
- *
- * @param name the name to check
- * @param suffix the suffix to check for
- * @return 1 if true
- */
-static int ends_with(const char *name, const char* suffix) {
- size_t ln, ls;
- assert(name);
- assert(suffix);
-
- if ((ls = strlen(suffix)) > (ln = strlen(name)))
- return 0;
-
- return strcasecmp(name+ln-ls, suffix) == 0;
-}
-
-
-/**
- * Check if name is inside .gnunet or .zkey TLD
- *
- * @param name name to check
- * @return 1 if true
- */
-static int verify_name_allowed(const char *name) {
- return ends_with(name, ".gnunet") || ends_with(name, ".zkey");
-}
-
/**
* The gethostbyname hook executed by nsswitch
*
* @param h_errnop idk
* @return a nss_status code
*/
-enum nss_status _nss_gns_gethostbyname2_r(
- const char *name,
- int af,
- struct hostent * result,
- char *buffer,
- size_t buflen,
- int *errnop,
- int *h_errnop) {
-
- struct userdata u;
- enum nss_status status = NSS_STATUS_UNAVAIL;
- int i;
- size_t address_length, l, idx, astart;
- int name_allowed;
-
- if (af == AF_UNSPEC)
+enum nss_status
+_nss_gns_gethostbyname2_r(const char *name,
+ int af,
+ struct hostent *result,
+ char *buffer,
+ size_t buflen,
+ int *errnop,
+ int *h_errnop)
+{
+ struct userdata u;
+ enum nss_status status = NSS_STATUS_UNAVAIL;
+ int i;
+ size_t address_length;
+ size_t l;
+ size_t idx;
+ size_t astart;
+
+ if (af == AF_UNSPEC)
#ifdef NSS_IPV6_ONLY
- af = AF_INET6;
+ af = AF_INET6;
#else
- af = AF_INET;
+ af = AF_INET;
#endif
#ifdef NSS_IPV4_ONLY
- if (af != AF_INET)
+ if (af != AF_INET)
#elif NSS_IPV6_ONLY
- if (af != AF_INET6)
-#else
- if (af != AF_INET && af != AF_INET6)
-#endif
- {
- *errnop = EINVAL;
- *h_errnop = NO_RECOVERY;
-
- goto finish;
- }
-
- address_length = af == AF_INET ? sizeof(ipv4_address_t) : sizeof(ipv6_address_t);
- if (buflen <
- sizeof(char*)+ /* alias names */
- strlen(name)+1) { /* official name */
-
- *errnop = ERANGE;
- *h_errnop = NO_RECOVERY;
- status = NSS_STATUS_TRYAGAIN;
-
- goto finish;
- }
-
- u.count = 0;
- u.data_len = 0;
-
- name_allowed = verify_name_allowed(name);
-
- if (name_allowed) {
-
- if (!gns_resolve_name(af, name, &u) == 0)
- {
- status = NSS_STATUS_NOTFOUND;
- }
- }
-
- if (u.count == 0) {
- *errnop = ETIMEDOUT;
- *h_errnop = HOST_NOT_FOUND;
- goto finish;
- }
-
-
- /* Alias names */
- *((char**) buffer) = NULL;
- result->h_aliases = (char**) buffer;
- idx = sizeof(char*);
-
- /* Official name */
- strcpy(buffer+idx, name);
- result->h_name = buffer+idx;
- idx += strlen(name)+1;
+ if (af != AF_INET6)
+#else
+ if ( (af != AF_INET) &&
+ (af != AF_INET6) )
+#endif
+ {
+ *errnop = EINVAL;
+ *h_errnop = NO_RECOVERY;
- ALIGN(idx);
-
- result->h_addrtype = af;
- result->h_length = address_length;
-
- /* Check if there's enough space for the addresses */
- if (buflen < idx+u.data_len+sizeof(char*)*(u.count+1)) {
- *errnop = ERANGE;
- *h_errnop = NO_RECOVERY;
- status = NSS_STATUS_TRYAGAIN;
- goto finish;
- }
+ goto finish;
+ }
+ address_length = (af == AF_INET) ? sizeof(ipv4_address_t) : sizeof(ipv6_address_t);
+ if (buflen <
+ sizeof(char*)+ /* alias names */
+ strlen(name)+1)
+ { /* official name */
+ *errnop = ERANGE;
+ *h_errnop = NO_RECOVERY;
+ status = NSS_STATUS_TRYAGAIN;
+
+ goto finish;
+ }
+ u.count = 0;
+ u.data_len = 0;
+ i = gns_resolve_name (af,
+ name,
+ &u);
+ if (-3 == i)
+ {
+ status = NSS_STATUS_NOTFOUND;
+ goto finish;
+ }
+ if (-2 == i)
+ {
+ status = NSS_STATUS_UNAVAIL;
+ goto finish;
+ }
+ if ( (-1 == i) ||
+ (u.count == 0) )
+ {
+ *errnop = ETIMEDOUT;
+ *h_errnop = HOST_NOT_FOUND;
+ status = NSS_STATUS_NOTFOUND;
+ goto finish;
+ }
+ /* Alias names */
+ *((char**) buffer) = NULL;
+ result->h_aliases = (char**) buffer;
+ idx = sizeof(char*);
+
+ /* Official name */
+ strcpy (buffer+idx,
+ name);
+ result->h_name = buffer+idx;
+ idx += strlen (name)+1;
+
+ ALIGN(idx);
+
+ result->h_addrtype = af;
+ result->h_length = address_length;
+
+ /* Check if there's enough space for the addresses */
+ if (buflen < idx+u.data_len+sizeof(char*)*(u.count+1))
+ {
+ *errnop = ERANGE;
+ *h_errnop = NO_RECOVERY;
+ status = NSS_STATUS_TRYAGAIN;
+ goto finish;
+ }
/* Addresses */
- astart = idx;
- l = u.count*address_length;
- memcpy(buffer+astart, &u.data, l);
- /* address_length is a multiple of 32bits, so idx is still aligned
- * correctly */
- idx += l;
-
- /* Address array address_lenght is always a multiple of 32bits */
- for (i = 0; i < u.count; i++)
- ((char**) (buffer+idx))[i] = buffer+astart+address_length*i;
- ((char**) (buffer+idx))[i] = NULL;
- result->h_addr_list = (char**) (buffer+idx);
+ astart = idx;
+ l = u.count*address_length;
+ if (0 != l)
+ memcpy (buffer+astart,
+ &u.data,
+ l);
+ /* address_length is a multiple of 32bits, so idx is still aligned
+ * correctly */
+ idx += l;
+
+ /* Address array address_length is always a multiple of 32bits */
+ for (i = 0; i < u.count; i++)
+ ((char**) (buffer+idx))[i] = buffer+astart+address_length*i;
+ ((char**) (buffer+idx))[i] = NULL;
+ result->h_addr_list = (char**) (buffer+idx);
+
+ status = NSS_STATUS_SUCCESS;
- status = NSS_STATUS_SUCCESS;
-
finish:
- return status;
+ return status;
}
+
/**
* The gethostbyname hook executed by nsswitch
*
* @param result the result hostent
* @param buffer the result buffer
* @param buflen length of the buffer
- * @param errnop idk
+ * @param errnop[out] the low-level error code to return to the application
* @param h_errnop idk
* @return a nss_status code
*/
-enum nss_status _nss_gns_gethostbyname_r (
- const char *name,
- struct hostent *result,
- char *buffer,
- size_t buflen,
- int *errnop,
- int *h_errnop) {
-
- return _nss_gns_gethostbyname2_r(
- name,
- AF_UNSPEC,
- result,
- buffer,
- buflen,
- errnop,
- h_errnop);
+enum nss_status
+_nss_gns_gethostbyname_r (const char *name,
+ struct hostent *result,
+ char *buffer,
+ size_t buflen,
+ int *errnop,
+ int *h_errnop)
+{
+ return _nss_gns_gethostbyname2_r (name,
+ AF_UNSPEC,
+ result,
+ buffer,
+ buflen,
+ errnop,
+ h_errnop);
}
+
/**
* The gethostbyaddr hook executed by nsswitch
* We can't do this so we always return NSS_STATUS_UNAVAIL
* @param result the result hostent
* @param buffer the result buffer
* @param buflen length of the buffer
- * @param errnop idk
+ * @param errnop[out] the low-level error code to return to the application
* @param h_errnop idk
* @return NSS_STATUS_UNAVAIL
*/
-enum nss_status _nss_gns_gethostbyaddr_r(
- const void* addr,
- int len,
- int af,
- struct hostent *result,
- char *buffer,
- size_t buflen,
- int *errnop,
- int *h_errnop) {
-
- /* we dont do this */
-
- enum nss_status status = NSS_STATUS_UNAVAIL;
-
- *errnop = EINVAL;
- *h_errnop = NO_RECOVERY;
-
- /* Check for address types */
-
- *h_errnop = NO_RECOVERY;
-
- status = NSS_STATUS_NOTFOUND;
- return status;
+enum nss_status
+_nss_gns_gethostbyaddr_r (const void* addr,
+ int len,
+ int af,
+ struct hostent *result,
+ char *buffer,
+ size_t buflen,
+ int *errnop,
+ int *h_errnop)
+{
+ *errnop = EINVAL;
+ *h_errnop = NO_RECOVERY;
+ //NOTE we allow to leak this into DNS so no NOTFOUND
+ return NSS_STATUS_UNAVAIL;
}
-
projects / oweals / gnunet.git / blobdiff