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/*
* cmd/ifctrstat-linux.c
* Purpose: Implement ifctrstat system-specific routines for Linux
*
* Copyright (c) 2020 Adélie Software in the Public Benefit, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* This software is provided 'as is' and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising
* from the use of this software.
*/
#define _GNU_SOURCE
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include "cmd/multicall.h"
#include "cmd/ifctrstat-linux.h"
struct counter_desc {
const char *name;
const void *data;
} avail_counters[] = {
{"rx.discard", "rx_dropped"},
{"rx.errors", "rx_errors"},
{"rx.octets", "rx_bytes"},
{"rx.packets", "rx_packets"},
{"tx.discard", "tx_dropped"},
{"tx.errors", "tx_errors"},
{"tx.octets", "tx_bytes"},
{"tx.packets", "tx_packets"}
};
size_t avail_counters_count = ARRAY_SIZE(avail_counters);
static int
counter_compare(const void *key, const void *candidate)
{
return strcasecmp((const char *)key, ((struct counter_desc *)candidate)->name);
}
const char *
read_counter(const char *interface, const char *counter)
{
FILE *fp;
const char *path;
char *full_path;
char buffer[1024];
size_t in_count;
struct counter_desc *ctrdata;
errno = 0;
ctrdata = bsearch(counter, avail_counters, avail_counters_count, sizeof(struct counter_desc), counter_compare);
if (ctrdata) {
path = (const char *)ctrdata->data;
} else {
errno = ENOSYS;
return NULL;
}
if (asprintf(&full_path, "/sys/class/net/%s/statistics/%s", interface, path) < 0)
{
return NULL;
}
fp = fopen(full_path, "r");
if (!fp)
{
return NULL;
}
free(full_path);
full_path = NULL;
in_count = fread(buffer, 1, sizeof(buffer), fp);
if (in_count == sizeof(buffer))
{
errno = ENOMEM;
fclose(fp);
return NULL;
}
if (ferror(fp))
{
return NULL;
}
fclose(fp);
/* take away the \n, we add our own */
buffer[in_count - 1] = '\0';
return strdup(buffer);
}
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