--- /dev/null
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of nss-myhostname.
+
+ 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 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, see
+ <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <asm/types.h>
+#include <inttypes.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <string.h>
+#include <assert.h>
+#include <errno.h>
+#include <limits.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <stdlib.h>
+
+#include "netlink.h"
+
+static int address_compare(const void *_a, const void *_b) {
+ const struct address *a = _a, *b = _b;
+
+ /* Order lowest scope first, IPv4 before IPv6, lowest interface index first */
+
+ if (a->scope < b->scope)
+ return -1;
+ if (a->scope > b->scope)
+ return 1;
+
+ if (a->family == AF_INET && b->family == AF_INET6)
+ return -1;
+ if (a->family == AF_INET6 && b->family == AF_INET)
+ return 1;
+
+ if (a->ifindex < b->ifindex)
+ return -1;
+ if (a->ifindex > b->ifindex)
+ return 1;
+
+ return 0;
+}
+
+int netlink_acquire_addresses(struct address **_list, unsigned *_n_list) {
+
+ struct {
+ struct nlmsghdr hdr;
+ struct rtgenmsg gen;
+ } req;
+ struct rtgenmsg *gen;
+ int fd, r, on = 1;
+ uint32_t seq = 4711;
+ struct address *list = NULL;
+ unsigned n_list = 0;
+
+ fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0)
+ return -errno;
+
+ if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ memset(&req, 0, sizeof(req));
+ req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
+ req.hdr.nlmsg_type = RTM_GETADDR;
+ req.hdr.nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP|NLM_F_ACK;
+ req.hdr.nlmsg_seq = seq;
+ req.hdr.nlmsg_pid = 0;
+
+ gen = NLMSG_DATA(&req.hdr);
+ gen->rtgen_family = AF_UNSPEC;
+
+ if (send(fd, &req, req.hdr.nlmsg_len, 0) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ for (;;) {
+ ssize_t bytes;
+ struct msghdr msg;
+ struct cmsghdr *cmsg;
+ struct ucred *ucred;
+ struct iovec iov;
+ struct nlmsghdr *p;
+ uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred))];
+ struct {
+ struct nlmsghdr hdr;
+ struct ifaddrmsg ifaddrmsg;
+ uint8_t payload[16*1024];
+ } resp;
+
+ memset(&iov, 0, sizeof(iov));
+ iov.iov_base = &resp;
+ iov.iov_len = sizeof(resp);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = cred_buffer;
+ msg.msg_controllen = sizeof(cred_buffer);
+ msg.msg_flags = 0;
+
+ bytes = recvmsg(fd, &msg, 0);
+ if (bytes < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ if (!cmsg || cmsg->cmsg_type != SCM_CREDENTIALS) {
+ r = -EIO;
+ goto finish;
+ }
+
+ ucred = (struct ucred*) CMSG_DATA(cmsg);
+ if (ucred->uid != 0 || ucred->pid != 0)
+ continue;
+
+ for (p = &resp.hdr; bytes > 0; p = NLMSG_NEXT(p, bytes)) {
+ struct ifaddrmsg *ifaddrmsg;
+ struct rtattr *a;
+ size_t l;
+ void *local = NULL, *address = NULL;
+
+ if (!NLMSG_OK(p, (size_t) bytes)) {
+ r = -EIO;
+ goto finish;
+ }
+
+ if (p->nlmsg_seq != seq)
+ continue;
+
+ if (p->nlmsg_type == NLMSG_DONE) {
+ r = 0;
+ goto finish;
+ }
+
+ if (p->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *nlmsgerr;
+
+ nlmsgerr = NLMSG_DATA(p);
+ r = -nlmsgerr->error;
+ goto finish;
+ }
+
+ if (p->nlmsg_type != RTM_NEWADDR)
+ continue;
+
+ ifaddrmsg = NLMSG_DATA(p);
+
+ if (ifaddrmsg->ifa_family != AF_INET &&
+ ifaddrmsg->ifa_family != AF_INET6)
+ continue;
+
+ if (ifaddrmsg->ifa_scope == RT_SCOPE_HOST ||
+ ifaddrmsg->ifa_scope == RT_SCOPE_NOWHERE)
+ continue;
+
+ if (ifaddrmsg->ifa_flags & IFA_F_DEPRECATED)
+ continue;
+
+ l = NLMSG_PAYLOAD(p, sizeof(struct ifaddrmsg));
+ a = IFA_RTA(ifaddrmsg);
+
+ while (RTA_OK(a, l)) {
+
+ if (a->rta_type == IFA_ADDRESS)
+ address = RTA_DATA(a);
+ else if (a->rta_type == IFA_LOCAL)
+ local = RTA_DATA(a);
+
+ a = RTA_NEXT(a, l);
+ }
+
+ if (local)
+ address = local;
+
+ if (!address)
+ continue;
+
+ list = realloc(list, (n_list+1) * sizeof(struct address));
+ if (!list) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ list[n_list].family = ifaddrmsg->ifa_family;
+ list[n_list].scope = ifaddrmsg->ifa_scope;
+ memcpy(list[n_list].address, address, ifaddrmsg->ifa_family == AF_INET ? 4 : 16);
+ list[n_list].ifindex = ifaddrmsg->ifa_index;
+
+ n_list++;
+ }
+ }
+
+finish:
+ close(fd);
+
+ if (r < 0)
+ free(list);
+ else {
+ qsort(list, n_list, sizeof(struct address), address_compare);
+
+ *_list = list;
+ *_n_list = n_list;
+ }
+
+ return r;
+}
-/*-*- 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
#define ALIGN(a) (((a+sizeof(void*)-1)/sizeof(void*))*sizeof(void*))
+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);
+
+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,
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) {
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;
}
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;
}
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;
}
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);
if (canonp)
*canonp = r_name;
+ free(addresses);
+
return NSS_STATUS_SUCCESS;
}
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,
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(
~ianmdlvl / elogind.git / commitdiff