[libvirt] [PATCH v3 1/4] util: introduce helper to parse /proc/net/arp

From: Chen Hanxiao <chenhanxiao(a)gmail.com&gt; introduce helper to parse /proc/net/arp and store it in struct virArpTable. Signed-off-by: Chen Hanxiao <chenhanxiao(a)gmail.com&gt; --- v3: s/virGetArpTable/virArpTableGet alloc virArpTable in virArpTableGet return ENOSUPP on none-Linux platform move helpers to virarptable.[ch] po/POTFILES.in | 1 + src/Makefile.am | 1 + src/libvirt_private.syms | 5 +++ src/util/virarptable.c | 114 +++++++++++++++++++++++++++++++++++++++++++++++ src/util/virarptable.h | 48 ++++++++++++++++++++ 5 files changed, 169 insertions(+) create mode 100644 src/util/virarptable.c create mode 100644 src/util/virarptable.h diff --git a/po/POTFILES.in b/po/POTFILES.in index 8382ee633..91a4c5730 100644 --- a/po/POTFILES.in +++ b/po/POTFILES.in @@ -193,6 +193,7 @@ src/uml/uml_conf.c src/uml/uml_driver.c src/util/iohelper.c src/util/viralloc.c +src/util/virarptable.c src/util/viraudit.c src/util/virauth.c src/util/virauthconfig.c diff --git a/src/Makefile.am b/src/Makefile.am index 289b03747..923eea6fe 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -98,6 +98,7 @@ augeastest_DATA = UTIL_SOURCES = \ util/viralloc.c util/viralloc.h \ util/virarch.h util/virarch.c \ + util/virarptable.h util/virarptable.c \ util/viratomic.h util/viratomic.c \ util/viraudit.c util/viraudit.h \ util/virauth.c util/virauth.h \ diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index f2a2c8650..08229797a 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -1332,6 +1332,11 @@ virArchGetWordSize; virArchToString; +# util/virarptable.h +virArpTableFree; +virArpTableGet; + + # util/viraudit.h virAuditClose; virAuditEncode; diff --git a/src/util/virarptable.c b/src/util/virarptable.c new file mode 100644 index 000000000..48a38352f --- /dev/null +++ b/src/util/virarptable.c @@ -0,0 +1,114 @@ +/* + * 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(a)gmail.com&gt; + */ + +#include <config.h> + +#include <stdlib.h> +#include <stdio.h> + +#include "viralloc.h" +#include "virarptable.h" +#include "virfile.h" +#include "virstring.h" + +#define VIR_FROM_THIS VIR_FROM_NONE + +#ifdef __linux__ + +virArpTablePtr virArpTableGet(void) +{ + FILE *fp = NULL; + char line[1024]; + int num = 0; + virArpTablePtr table = NULL; + + if (VIR_ALLOC(table) < 0) + return NULL; + + if (!(fp = fopen("/proc/net/arp", "r"))) + goto cleanup; + + while (fgets(line, sizeof(line), fp)) { + char ip[32], mac[32], dev_name[32], hwtype[32], + flags[32], mask[32], nouse[32]; + + if (STRPREFIX(line, "IP address")) + continue; + + if (VIR_REALLOC_N(table->t, num + 1) < 0) + goto cleanup; + + table->n = num + 1; + + /* /proc/net/arp looks like: + * 172.16.17.254 0x1 0x2 e4:68:a3:8d:ed:d3 * enp3s0 + */ + sscanf(line, "%[0-9.]%[ ]%[^ ]%[ ]%[^ ]%[ ]%[^ ]%[ ]%[^ ]%[ ]%[^ \t\n]", + ip, nouse, + hwtype, nouse, + flags, nouse, + mac, nouse, + mask, nouse, + dev_name); + + if (VIR_STRDUP(table->t[num].ipaddr, ip) < 0) + goto cleanup; + + if (VIR_STRDUP(table->t[num].mac, mac) < 0) + goto cleanup; + + if (VIR_STRDUP(table->t[num].dev_name, dev_name) < 0) + goto cleanup; + + num++; + } + + return table; + + cleanup: + VIR_FORCE_FCLOSE(fp); + 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[i].dev_name); + } + VIR_FREE(table); +} diff --git a/src/util/virarptable.h b/src/util/virarptable.h new file mode 100644 index 000000000..77db4e9f4 --- /dev/null +++ b/src/util/virarptable.h @@ -0,0 +1,48 @@ +/* + * 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(a)gmail.com&gt; + */ + +#ifndef __VIR_ARPTABLE_H__ +# define __VIR_ARPTABLE_H__ + +# include "internal.h" + +typedef struct _virArpTableEntry virArpTableEntry; +typedef virArpTableEntry *virArpTableEntryPtr; +typedef struct _virArpTable virArpTable; +typedef virArpTable *virArpTablePtr; + +struct _virArpTableEntry{ + char *ipaddr; + char *mac; + char *dev_name; +}; + +struct _virArpTable { + int n; + virArpTableEntryPtr t; +}; + +virArpTablePtr virArpTableGet(void); +void virArpTableFree(virArpTablePtr table); + +#endif /* __VIR_ARPTABLE_H__ */ -- 2.14.3