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-rw-r--r--nss-myhostname.c271
1 files changed, 207 insertions, 64 deletions
diff --git a/nss-myhostname.c b/nss-myhostname.c
index 14ed30b..b091fba 100644
--- a/nss-myhostname.c
+++ b/nss-myhostname.c
@@ -1,39 +1,38 @@
-/*-*- Mode: C; c-basic-offset: 8 -*-*/
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
- This file is part of nss-myhostname.
+ This file is part of nss-myhostname.
- Copyright 2008 Lennart Poettering
+ Copyright 2008-2011 Lennart Poettering
- nss-myhostname 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 2.1
- of the License, or (at your option) any later version.
+ nss-myhostname 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 2.1 of
+ the License, or (at your option) any later version.
- nss-myhostname is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
+ nss-myhostname is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with nss-myhostname. If not, If not, see
- <http://www.gnu.org/licenses/>.
+ You should have received a copy of the GNU Lesser General Public
+ License along with nss-myhostname; If not, see
+ <http://www.gnu.org/licenses/>.
***/
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
#include <limits.h>
#include <nss.h>
#include <sys/types.h>
#include <netdb.h>
#include <errno.h>
#include <string.h>
-#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <net/if.h>
+#include <stdlib.h>
+#include <arpa/inet.h>
+
+#include "netlink.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
@@ -51,13 +50,59 @@ enum nss_status _nss_myhostname_gethostbyname4_r(
struct gaih_addrtuple **pat,
char *buffer, size_t buflen,
int *errnop, int *h_errnop,
+ int32_t *ttlp);
+
+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);
+
+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);
+
+enum nss_status _nss_myhostname_gethostbyname_r(
+ const char *name,
+ struct hostent *host,
+ char *buffer, size_t buflen,
+ int *errnop, int *h_errnop);
+
+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);
+
+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);
+
+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) {
- unsigned ifi;
+ unsigned lo_ifi;
char hn[HOST_NAME_MAX+1];
size_t l, idx, ms;
char *r_name;
- struct gaih_addrtuple *r_tuple1, *r_tuple2;
+ struct gaih_addrtuple *r_tuple, *r_tuple_prev = NULL;
+ struct address *addresses = NULL, *a;
+ unsigned n_addresses = 0, n;
memset(hn, 0, sizeof(hn));
if (gethostname(hn, sizeof(hn)-1) < 0) {
@@ -72,14 +117,18 @@ enum nss_status _nss_myhostname_gethostbyname4_r(
return NSS_STATUS_NOTFOUND;
}
+ /* If this fails, n_addresses is 0. Which is fine */
+ netlink_acquire_addresses(&addresses, &n_addresses);
+
/* If this call fails we fill in 0 as scope. Which is fine */
- ifi = if_nametoindex(LOOPBACK_INTERFACE);
+ lo_ifi = if_nametoindex(LOOPBACK_INTERFACE);
l = strlen(hn);
- ms = ALIGN(l+1)+ALIGN(sizeof(struct gaih_addrtuple))*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;
}
@@ -88,32 +137,53 @@ enum nss_status _nss_myhostname_gethostbyname4_r(
memcpy(r_name, hn, l+1);
idx = ALIGN(l+1);
- /* Second, fill in IPv4 tuple */
- r_tuple1 = (struct gaih_addrtuple*) (buffer + idx);
- r_tuple1->next = NULL;
- r_tuple1->name = r_name;
- r_tuple1->family = AF_INET;
- *(uint32_t*) r_tuple1->addr = LOCALADDRESS_IPV4;
- r_tuple1->scopeid = (uint32_t) ifi;
- idx += ALIGN(sizeof(struct gaih_addrtuple));
-
- /* Third, fill in IPv6 tuple */
- r_tuple2 = (struct gaih_addrtuple*) (buffer + idx);
- r_tuple2->next = r_tuple1;
- r_tuple2->name = r_name;
- r_tuple2->family = AF_INET6;
- memcpy(r_tuple2->addr, LOCALADDRESS_IPV6, 16);
- r_tuple2->scopeid = (uint32_t) ifi;
- idx += ALIGN(sizeof(struct gaih_addrtuple));
+ 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;
+
+ idx += ALIGN(sizeof(struct gaih_addrtuple));
+ r_tuple_prev = r_tuple;
+
+ /* Third, fill in IPv4 tuple */
+ r_tuple = (struct gaih_addrtuple*) (buffer + idx);
+ r_tuple->next = r_tuple_prev;
+ r_tuple->name = r_name;
+ r_tuple->family = AF_INET;
+ *(uint32_t*) r_tuple->addr = LOCALADDRESS_IPV4;
+ r_tuple->scopeid = (uint32_t) lo_ifi;
+
+ idx += ALIGN(sizeof(struct gaih_addrtuple));
+ r_tuple_prev = r_tuple;
+ }
+
+ /* Fourth, fill actual addresses in, but in backwards order */
+ for (a = addresses + n_addresses - 1, n = 0; 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);
+
+ idx += ALIGN(sizeof(struct gaih_addrtuple));
+ r_tuple_prev = r_tuple;
+ }
/* Verify the size matches */
assert(idx == ms);
- *pat = r_tuple2;
+ *pat = r_tuple_prev;
if (ttlp)
*ttlp = 0;
+ free(addresses);
+
return NSS_STATUS_SUCCESS;
}
@@ -129,14 +199,27 @@ static enum nss_status fill_in_hostent(
size_t l, idx, ms;
char *r_addr, *r_name, *r_aliases, *r_addr_list;
size_t alen;
+ struct address *addresses = NULL, *a;
+ unsigned n_addresses = 0, n, c;
+
+ alen = PROTO_ADDRESS_SIZE(af);
+
+ netlink_acquire_addresses(&addresses, &n_addresses);
- alen = af == AF_INET ? 4 : 16;
+ for (a = addresses, n = 0, c = 0; n < n_addresses; a++, n++)
+ if (af == a->family)
+ c++;
l = strlen(hn);
- ms = ALIGN(l+1)+sizeof(char*)+ALIGN(alen)+sizeof(char*)*2;
+ ms = ALIGN(l+1)+
+ 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;
}
@@ -145,24 +228,57 @@ static enum nss_status fill_in_hostent(
memcpy(r_name, hn, l+1);
idx = ALIGN(l+1);
- /* Second, create aliases array */
+ /* Second, create (empty) aliases array */
r_aliases = buffer + idx;
*(char**) r_aliases = NULL;
idx += sizeof(char*);
- /* Third, add address */
+ /* Third, add addresses */
r_addr = buffer + idx;
- if (af == AF_INET)
- *(uint32_t*) r_addr = LOCALADDRESS_IPV4;
- else
- memcpy(r_addr, LOCALADDRESS_IPV6, 16);
- idx += ALIGN(alen);
+ if (c > 0) {
+ unsigned i = 0;
+
+ for (a = addresses, n = 0; n < n_addresses; a++, n++) {
+ if (af != a->family)
+ continue;
+
+ memcpy(r_addr + i*ALIGN(alen), a->address, alen);
+ i++;
+ }
+
+ assert(i == c);
+ idx += c*ALIGN(alen);
+ } else {
+ if (af == AF_INET)
+ *(uint32_t*) r_addr = LOCALADDRESS_IPV4;
+ else
+ memcpy(r_addr, LOCALADDRESS_IPV6, 16);
+
+ idx += ALIGN(alen);
+ }
/* Fourth, add address pointer array */
r_addr_list = buffer + idx;
- ((char**) r_addr_list)[0] = r_addr;
- ((char**) r_addr_list)[1] = NULL;
- idx += sizeof(char*)*2;
+ if (c > 0) {
+ unsigned i = 0;
+
+ for (a = addresses, n = 0; n < n_addresses; a++, n++) {
+ if (af != a->family)
+ continue;
+
+ ((char**) r_addr_list)[i] = (r_addr + i*ALIGN(alen));
+ i++;
+ }
+
+ assert(i == c);
+ ((char**) r_addr_list)[c] = NULL;
+ idx += (c+1)*sizeof(char*);
+
+ } else {
+ ((char**) r_addr_list)[0] = r_addr;
+ ((char**) r_addr_list)[1] = NULL;
+ idx += 2*sizeof(char*);
+ }
/* Verify the size matches */
assert(idx == ms);
@@ -179,6 +295,8 @@ static enum nss_status fill_in_hostent(
if (canonp)
*canonp = r_name;
+ free(addresses);
+
return NSS_STATUS_SUCCESS;
}
@@ -235,7 +353,7 @@ enum nss_status _nss_myhostname_gethostbyname2_r(
NULL);
}
-enum nss_status _nss_myhostname_gethostbyname_r (
+enum nss_status _nss_myhostname_gethostbyname_r(
const char *name,
struct hostent *host,
char *buffer, size_t buflen,
@@ -260,35 +378,60 @@ enum nss_status _nss_myhostname_gethostbyaddr2_r(
int32_t *ttlp) {
char hn[HOST_NAME_MAX+1];
+ struct address *addresses = NULL, *a;
+ unsigned n_addresses = 0, n;
+
+ if (len != PROTO_ADDRESS_SIZE(af)) {
+ *errnop = EINVAL;
+ *h_errnop = NO_RECOVERY;
+ return NSS_STATUS_UNAVAIL;
+ }
if (af == AF_INET) {
- if (len != 4 ||
- (*(uint32_t*) addr) != LOCALADDRESS_IPV4)
- goto not_found;
+
+ if ((*(uint32_t*) addr) == LOCALADDRESS_IPV4)
+ goto found;
} else if (af == AF_INET6) {
- if (len != 16 ||
- memcmp(addr, LOCALADDRESS_IPV6, 16) != 0)
- goto not_found;
+
+ if (memcmp(addr, LOCALADDRESS_IPV6, 16) == 0)
+ goto found;
+
} else {
*errnop = EAFNOSUPPORT;
*h_errnop = NO_DATA;
return NSS_STATUS_UNAVAIL;
}
+ netlink_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:
+ free(addresses);
+
memset(hn, 0, sizeof(hn));
if (gethostname(hn, sizeof(hn)-1) < 0) {
*errnop = errno;
*h_errnop = NO_RECOVERY;
+
return NSS_STATUS_UNAVAIL;
}
return fill_in_hostent(hn, af, host, buffer, buflen, errnop, h_errnop, ttlp, NULL);
-not_found:
- *errnop = ENOENT;
- *h_errnop = HOST_NOT_FOUND;
- return NSS_STATUS_NOTFOUND;
}
enum nss_status _nss_myhostname_gethostbyaddr_r(
generated by cgit (git 2.34.1) at 2024-04-29 22:42:52 +0000