提交 a176d67c 编写于 作者: C Chen Hanxiao 提交者: Michal Privoznik

util: introduce helper to parse message from RTM_GETNEIGH query

introduce helper to parse RTM_GETNEIGH query message and
store it in struct virArpTable.
Signed-off-by: NChen Hanxiao <chenhanxiao@gmail.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
上级 414e6110
...@@ -192,6 +192,7 @@ src/uml/uml_conf.c ...@@ -192,6 +192,7 @@ src/uml/uml_conf.c
src/uml/uml_driver.c src/uml/uml_driver.c
src/util/iohelper.c src/util/iohelper.c
src/util/viralloc.c src/util/viralloc.c
src/util/virarptable.c
src/util/viraudit.c src/util/viraudit.c
src/util/virauth.c src/util/virauth.c
src/util/virauthconfig.c src/util/virauthconfig.c
......
...@@ -672,6 +672,7 @@ noinst_LTLIBRARIES += libvirt-setuid-rpc-client.la ...@@ -672,6 +672,7 @@ noinst_LTLIBRARIES += libvirt-setuid-rpc-client.la
libvirt_setuid_rpc_client_la_SOURCES = \ libvirt_setuid_rpc_client_la_SOURCES = \
util/viralloc.c \ util/viralloc.c \
util/virarch.c \ util/virarch.c \
util/virarptable.c \
util/viratomic.c \ util/viratomic.c \
util/viratomic.h \ util/viratomic.h \
util/virbitmap.c \ util/virbitmap.c \
......
...@@ -1366,6 +1366,11 @@ virArchGetWordSize; ...@@ -1366,6 +1366,11 @@ virArchGetWordSize;
virArchToString; virArchToString;
# util/virarptable.h
virArpTableFree;
virArpTableGet;
# util/viraudit.h # util/viraudit.h
virAuditClose; virAuditClose;
virAuditEncode; virAuditEncode;
......
...@@ -5,6 +5,8 @@ UTIL_SOURCES = \ ...@@ -5,6 +5,8 @@ UTIL_SOURCES = \
util/viralloc.h \ util/viralloc.h \
util/virarch.c \ util/virarch.c \
util/virarch.h \ util/virarch.h \
util/virarptable.c \
util/virarptable.h \
util/viratomic.c \ util/viratomic.c \
util/viratomic.h \ util/viratomic.h \
util/viraudit.c \ util/viraudit.c \
......
/*
* virarptable.c Linux ARP table handling
*
* Copyright (C) 2018 Chen Hanxiao
*
* This library 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.
*
* This library 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 this library. If not, see
* <http://www.gnu.org/licenses/>.
*
* Authors:
* Chen Hanxiao <chenhanxiao@gmail.com>
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <arpa/inet.h>
#include "viralloc.h"
#include "virarptable.h"
#include "virfile.h"
#include "virlog.h"
#include "virnetlink.h"
#include "virsocketaddr.h"
#include "virstring.h"
#define VIR_FROM_THIS VIR_FROM_NONE
VIR_LOG_INIT("util.arptable");
#ifdef __linux__
# define NDA_RTA(r) \
((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
static int
parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
{
memset(tb, 0, sizeof(struct rtattr *) * (max + 1));
while (RTA_OK(rta, len)) {
if ((rta->rta_type <= max) && (!tb[rta->rta_type]))
tb[rta->rta_type] = rta;
rta = RTA_NEXT(rta, len);
}
if (len)
VIR_WARN("malformed netlink message: Deficit %d, rta_len=%d",
len, rta->rta_len);
return 0;
}
virArpTablePtr virArpTableGet(void)
{
int num = 0;
int msglen;
void *nlData = NULL;
virArpTablePtr table = NULL;
char *ipstr = NULL;
struct nlmsghdr* nh;
struct rtattr * tb[NDA_MAX+1];
msglen = virNetlinkGetNeighbor(&nlData, 0, 0);
if (msglen < 0)
return NULL;
if (VIR_ALLOC(table) < 0)
return NULL;
nh = (struct nlmsghdr*)nlData;
while (NLMSG_OK(nh, msglen)) {
struct ndmsg *r = NLMSG_DATA(nh);
int len = nh->nlmsg_len;
void *addr;
if ((len -= NLMSG_LENGTH(sizeof(*nh))) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("wrong nlmsg len"));
goto cleanup;
}
if (r->ndm_family && (r->ndm_family != AF_INET))
goto next_nlmsg;
/* catch stale and reachalbe arp entry only */
if (r->ndm_state &&
(!(r->ndm_state == NUD_STALE || r->ndm_state == NUD_REACHABLE))) {
nh = NLMSG_NEXT(nh, msglen);
continue;
}
if (nh->nlmsg_type == NLMSG_DONE)
goto end_of_netlink_messages;
parse_rtattr(tb, NDA_MAX, NDA_RTA(r),
nh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
if (tb[NDA_DST] == NULL || tb[NDA_LLADDR] == NULL)
goto next_nlmsg;
if (tb[NDA_DST]) {
virSocketAddr virAddr;
if (VIR_REALLOC_N(table->t, num + 1) < 0)
goto cleanup;
table->n = num + 1;
addr = RTA_DATA(tb[NDA_DST]);
bzero(&virAddr, sizeof(virAddr));
virAddr.len = sizeof(virAddr.data.inet4);
virAddr.data.inet4.sin_family = AF_INET;
virAddr.data.inet4.sin_addr = *(struct in_addr *)addr;
ipstr = virSocketAddrFormat(&virAddr);
if (VIR_STRDUP(table->t[num].ipaddr, ipstr) < 0)
goto cleanup;
VIR_FREE(ipstr);
}
if (tb[NDA_LLADDR]) {
virMacAddr macaddr;
char ifmac[VIR_MAC_STRING_BUFLEN];
addr = RTA_DATA(tb[NDA_LLADDR]);
memcpy(macaddr.addr, addr, VIR_MAC_BUFLEN);
virMacAddrFormat(&macaddr, ifmac);
if (VIR_STRDUP(table->t[num].mac, ifmac) < 0)
goto cleanup;
num++;
}
next_nlmsg:
nh = NLMSG_NEXT(nh, msglen);
}
end_of_netlink_messages:
VIR_FREE(nlData);
return table;
cleanup:
VIR_FREE(ipstr);
VIR_FREE(nlData);
return NULL;
}
#else
virArpTablePtr virArpTableGet(void)
{
virReportError(VIR_ERR_NO_SUPPORT, "%s",
_("get arp table not implemented on this platform"));
return NULL;
}
#endif /* __linux__ */
void
virArpTableFree(virArpTablePtr table)
{
size_t i;
for (i = 0; i < table->n; i++) {
VIR_FREE(table->t[i].ipaddr);
VIR_FREE(table->t[i].mac);
}
VIR_FREE(table->t);
VIR_FREE(table);
}
/*
* virarptable.h Linux ARP table handling
*
* Copyright (C) 2018 Chen Hanxiao
*
* This library 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.
*
* This library 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 this library. If not, see
* <http://www.gnu.org/licenses/>.
*
* Authors:
* Chen Hanxiao <chenhanxiao@gmail.com>
*/
#ifndef __VIR_ARPTABLE_H__
# define __VIR_ARPTABLE_H__
# include "internal.h"
# include <linux/rtnetlink.h>
typedef struct _virArpTableEntry virArpTableEntry;
typedef virArpTableEntry *virArpTableEntryPtr;
typedef struct _virArpTable virArpTable;
typedef virArpTable *virArpTablePtr;
struct _virArpTableEntry{
char *ipaddr;
char *mac;
};
struct _virArpTable {
int n;
virArpTableEntryPtr t;
};
virArpTablePtr virArpTableGet(void);
void virArpTableFree(virArpTablePtr table);
#endif /* __VIR_ARPTABLE_H__ */
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