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
USA.
***/
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
+#include <gnunet_config.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
-#elif defined(NSS_IPV4_ONLY)
-#define _nss_mdns_gethostbyname2_r _nss_gns4_minimal_gethostbyname2_r
-#define _nss_mdns_gethostbyname_r _nss_gns4_minimal_gethostbyname_r
-#define _nss_mdns_gethostbyaddr_r _nss_gns4_minimal_gethostbyaddr_r
-#elif defined(NSS_IPV6_ONLY)
-#define _nss_mdns_gethostbyname2_r _nss_gns6_gethostbyname2_r
-#define _nss_mdns_gethostbyname_r _nss_gns6_gethostbyname_r
-#define _nss_mdns_gethostbyaddr_r _nss_gns6_gethostbyaddr_r
-#else
-#define _nss_mdns_gethostbyname2_r _nss_gns_gethostbyname2_r
-#define _nss_mdns_gethostbyname_r _nss_gns_gethostbyname_r
-#define _nss_mdns_gethostbyaddr_r _nss_gns_gethostbyaddr_r
-#endif
+#include "nss_gns_query.h"
-/* Maximum number of entries to return */
-#define MAX_ENTRIES 16
+#include <arpa/inet.h>
+/** macro to align idx to 32bit boundary */
#define ALIGN(idx) do { \
if (idx % sizeof(void*)) \
idx += (sizeof(void*) - idx % sizeof(void*)); /* Align on 32 bit boundary */ \
} while(0)
-struct userdata {
- int count;
- int data_len; /* only valid when doing reverse lookup */
- union {
- ipv4_address_t ipv4[MAX_ENTRIES];
- ipv6_address_t ipv6[MAX_ENTRIES];
- char *name[MAX_ENTRIES];
- } data;
-};
-
-#ifndef NSS_IPV6_ONLY
-static void ipv4_callback(const ipv4_address_t *ipv4, void *userdata) {
- struct userdata *u = userdata;
- assert(ipv4 && userdata);
-
- if (u->count >= MAX_ENTRIES)
- return;
-
- u->data.ipv4[u->count++] = *ipv4;
- u->data_len += sizeof(ipv4_address_t);
-}
-#endif
-
-#ifndef NSS_IPV4_ONLY
-static void ipv6_callback(const ipv6_address_t *ipv6, void *userdata) {
- struct userdata *u = userdata;
- assert(ipv6 && userdata);
-
- if (u->count >= MAX_ENTRIES)
- return;
-
- u->data.ipv6[u->count++] = *ipv6;
- u->data_len += sizeof(ipv6_address_t);
-}
-#endif
-
-static void name_callback(const char*name, void *userdata) {
- struct userdata *u = userdata;
- assert(name && userdata);
-
- if (u->count >= MAX_ENTRIES)
- return;
-
- u->data.name[u->count++] = strdup(name);
- u->data_len += strlen(name)+1;
-}
+/**
+ * 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);
return strcasecmp(name+ln-ls, suffix) == 0;
}
-static int verify_name_allowed(const char *name) {
- return ends_with(name, ".gnunet") || ends_with(name, ".zkey");
+
+/**
+ * Check if name is inside .gnu or .zkey TLD
+ *
+ * @param name name to check
+ * @return 1 if true
+ */
+static int verify_name_allowed (const char *name) {
+ return ends_with(name, ".gnu") || ends_with(name, ".zkey");
}
+/**
+ * The gethostbyname hook executed by nsswitch
+ *
+ * @param name the name to resolve
+ * @param af the address family to resolve
+ * @param result the result hostent
+ * @param buffer the result buffer
+ * @param buflen length of the buffer
+ * @param errnop idk
+ * @param h_errnop idk
+ * @return a nss_status code
+ */
enum nss_status _nss_gns_gethostbyname2_r(
const char *name,
int af,
enum nss_status status = NSS_STATUS_UNAVAIL;
int i;
size_t address_length, l, idx, astart;
- void (*ipv4_func)(const ipv4_address_t *ipv4, void *userdata);
- void (*ipv6_func)(const ipv6_address_t *ipv6, void *userdata);
int name_allowed;
if (af == AF_UNSPEC)
#endif
#ifdef NSS_IPV4_ONLY
- if (af != AF_INET)
+ if (af != AF_INET)
#elif NSS_IPV6_ONLY
if (af != AF_INET6)
-#else
+#else
if (af != AF_INET && af != AF_INET6)
-#endif
- {
+#endif
+ {
*errnop = EINVAL;
*h_errnop = NO_RECOVERY;
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;
-#ifdef NSS_IPV6_ONLY
- ipv4_func = NULL;
-#else
- ipv4_func = af == AF_INET ? ipv4_callback : NULL;
-#endif
+ name_allowed = verify_name_allowed(name);
-#ifdef NSS_IPV4_ONLY
- ipv6_func = NULL;
-#else
- ipv6_func = af == AF_INET6 ? ipv6_callback : NULL;
-#endif
+ if (name_allowed) {
-#ifdef ENABLE_GNS
- name_allowed = verify_name_allowed(name);
-
- if (gns_works && name_allowed) {
- int r;
-
- if ((r = gns_resolve_name(af, name, data)) < 0)
- gns_works = 0;
- else if (r == 0) {
- if (af == AF_INET && ipv4_func)
- ipv4_func((ipv4_address_t*) data, &u);
- if (af == AF_INET6 && ipv6_func)
- ipv6_func((ipv6_address_t*)data, &u);
- } else
- status = NSS_STATUS_NOTFOUND;
+ if (!gns_resolve_name(af, name, &u) == 0)
+ {
+ status = NSS_STATUS_NOTFOUND;
+ goto finish;
+ }
+ }
+ else
+ {
+ status = NSS_STATUS_UNAVAIL;
+ goto finish;
}
-
-#endif /* ENABLE_GNS */
if (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);
+ 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;
result->h_addr_list = (char**) (buffer+idx);
status = NSS_STATUS_SUCCESS;
-
+
finish:
return status;
}
+/**
+ * The gethostbyname hook executed by nsswitch
+ *
+ * @param name the name to resolve
+ * @param result the result hostent
+ * @param buffer the result buffer
+ * @param buflen length of the buffer
+ * @param errnop idk
+ * @param h_errnop idk
+ * @return a nss_status code
+ */
enum nss_status _nss_gns_gethostbyname_r (
const char *name,
struct hostent *result,
h_errnop);
}
+/**
+ * The gethostbyaddr hook executed by nsswitch
+ * We can't do this so we always return NSS_STATUS_UNAVAIL
+ *
+ * @param addr the address to resolve
+ * @param len the length of the address
+ * @param af the address family of the address
+ * @param result the result hostent
+ * @param buffer the result buffer
+ * @param buflen length of the buffer
+ * @param errnop idk
+ * @param h_errnop idk
+ * @return NSS_STATUS_UNAVAIL
+ */
enum nss_status _nss_gns_gethostbyaddr_r(
const void* addr,
int len,
int *h_errnop) {
/* we dont do this */
-
- struct userdata u;
+
enum nss_status status = NSS_STATUS_UNAVAIL;
- int r;
- size_t address_length, idx, astart;
-
+
*errnop = EINVAL;
*h_errnop = NO_RECOVERY;
- u.count = 0;
- u.data_len = 0;
-
/* Check for address types */
*h_errnop = NO_RECOVERY;
projects / oweals / gnunet.git / blobdiff