Zabbix

/*

** Copyright (C) 2001-2024 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** This program 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 Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

#include "zbxsysinfo.h"

#include "../sysinfo.h"

​

#include "zbxjson.h"

​

static struct nlist kernel_symbols[] =

{

    {"_ifnet", N_UNDF, 0, 0, 0},

    {"_tcbtable", N_UNDF, 0, 0, 0},

    {NULL, 0, 0, 0, 0}

};

​

static int  get_ifdata(const char *if_name,

        zbx_uint64_t *ibytes, zbx_uint64_t *ipackets, zbx_uint64_t *ierrors, zbx_uint64_t *idropped,

        zbx_uint64_t *obytes, zbx_uint64_t *opackets, zbx_uint64_t *oerrors,

        zbx_uint64_t *tbytes, zbx_uint64_t *tpackets, zbx_uint64_t *terrors,

        zbx_uint64_t *icollisions, char **error)

{

#define IFNET_ID 0

    struct ifnet_head   head;

    struct ifnet        *ifp;

    struct ifnet        v;

​

    kvm_t   *kp;

    int ret = SYSINFO_RET_FAIL;

​

    if (NULL == if_name || '\0' == *if_name)

    {

        *error = zbx_strdup(NULL, "Network interface name cannot be empty.");

        return FAIL;

    }

​

    if (NULL == (kp = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL))) /* requires root privileges */

    {

        *error = zbx_strdup(NULL, "Cannot obtain a descriptor to access kernel virtual memory.");

        return FAIL;

    }

​

    if (N_UNDF == kernel_symbols[IFNET_ID].n_type)

        if (0 != kvm_nlist(kp, &kernel_symbols[0]))

            kernel_symbols[IFNET_ID].n_type = N_UNDF;

​

    if (N_UNDF != kernel_symbols[IFNET_ID].n_type)

    {

        int len = sizeof(struct ifnet_head);

​

        if (kvm_read(kp, kernel_symbols[IFNET_ID].n_value, &head, len) >= len)

        {

            len = sizeof(struct ifnet);