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proc_net_stat_synproxy.c

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#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include "common.h"

#include "appconfig.h"

#include "procfile.h"

#include "rrd.h"

#include "plugin_proc.h"

#include "log.h"

#define RRD_TYPE_NET_STAT_NETFILTER "netfilter"

#define RRD_TYPE_NET_STAT_SYNPROXY "synproxy"

#define RRD_TYPE_NET_STAT_SYNPROXY_LEN strlen(RRD_TYPE_NET_STAT_SYNPROXY)

int do_proc_net_stat_synproxy(int update_every, unsigned long long dt) {

static int do_entries = -1, do_cookies = -1, do_syns = -1, do_reopened = -1;

static procfile *ff = NULL;

if(do_entries == -1) do_entries = config_get_boolean_ondemand("plugin:proc:/proc/net/stat/synproxy", "SYNPROXY entries", CONFIG_ONDEMAND_ONDEMAND);

if(do_cookies == -1) do_cookies = config_get_boolean_ondemand("plugin:proc:/proc/net/stat/synproxy", "SYNPROXY cookies", CONFIG_ONDEMAND_ONDEMAND);

if(do_syns == -1) do_syns = config_get_boolean_ondemand("plugin:proc:/proc/net/stat/synproxy", "SYNPROXY SYN received", CONFIG_ONDEMAND_ONDEMAND);

if(do_reopened == -1) do_reopened = config_get_boolean_ondemand("plugin:proc:/proc/net/stat/synproxy", "SYNPROXY connections reopened", CONFIG_ONDEMAND_ONDEMAND);

if(dt) {};

if(!ff) {

char filename[FILENAME_MAX + 1];

snprintf(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/net/stat/synproxy");

ff = procfile_open(config_get("plugin:proc:/proc/net/stat/synproxy", "filename to monitor", filename), " \t,:|", PROCFILE_FLAG_DEFAULT);

}

if(!ff) return 1;

ff = procfile_readall(ff);

if(!ff) return 0; // we return 0, so that we will retry to open it next time

// make sure we have 3 lines

unsigned long lines = procfile_lines(ff), l;

if(lines < 2) {

error("/proc/net/stat/synproxy has %d lines, expected no less than 2. Disabling it.", lines);

return 1;

}

unsigned long long entries = 0, syn_received = 0, cookie_invalid = 0, cookie_valid = 0, cookie_retrans = 0, conn_reopened = 0;

// synproxy gives its values per CPU

for(l = 1; l < lines ;l++) {

int words = procfile_linewords(ff, l);

if(words < 6) continue;

entries += strtoull(procfile_lineword(ff, l, 0), NULL, 16);

syn_received += strtoull(procfile_lineword(ff, l, 1), NULL, 16);

cookie_invalid += strtoull(procfile_lineword(ff, l, 2), NULL, 16);

cookie_valid += strtoull(procfile_lineword(ff, l, 3), NULL, 16);

cookie_retrans += strtoull(procfile_lineword(ff, l, 4), NULL, 16);

conn_reopened += strtoull(procfile_lineword(ff, l, 5), NULL, 16);

}

unsigned long long events = entries + syn_received + cookie_invalid + cookie_valid + cookie_retrans + conn_reopened;

RRDSET *st;

// --------------------------------------------------------------------

if((do_entries == CONFIG_ONDEMAND_ONDEMAND && events) || do_entries == CONFIG_ONDEMAND_YES) {

do_entries = CONFIG_ONDEMAND_YES;

st = rrdset_find(RRD_TYPE_NET_STAT_NETFILTER "." RRD_TYPE_NET_STAT_SYNPROXY "_entries");

if(!st) {

st = rrdset_create(RRD_TYPE_NET_STAT_NETFILTER, RRD_TYPE_NET_STAT_SYNPROXY "_entries", NULL, RRD_TYPE_NET_STAT_SYNPROXY, NULL, "SYNPROXY Entries Used", "entries", 1004, update_every, RRDSET_TYPE_LINE);

rrddim_add(st, "entries", NULL, 1, 1, RRDDIM_ABSOLUTE);

}

else rrdset_next(st);

rrddim_set(st, "entries", entries);

rrdset_done(st);

}

// --------------------------------------------------------------------

if((do_syns == CONFIG_ONDEMAND_ONDEMAND && events) || do_syns == CONFIG_ONDEMAND_YES) {

do_syns = CONFIG_ONDEMAND_YES;

st = rrdset_find(RRD_TYPE_NET_STAT_NETFILTER "." RRD_TYPE_NET_STAT_SYNPROXY "_syn_received");

if(!st) {

st = rrdset_create(RRD_TYPE_NET_STAT_NETFILTER, RRD_TYPE_NET_STAT_SYNPROXY "_syn_received", NULL, RRD_TYPE_NET_STAT_SYNPROXY, NULL, "SYNPROXY SYN Packets received", "SYN/s", 1001, update_every, RRDSET_TYPE_LINE);

rrddim_add(st, "received", NULL, 1, 1, RRDDIM_INCREMENTAL);

}

else rrdset_next(st);

rrddim_set(st, "received", syn_received);

rrdset_done(st);

}

// --------------------------------------------------------------------

if((do_reopened == CONFIG_ONDEMAND_ONDEMAND && events) || do_reopened == CONFIG_ONDEMAND_YES) {

do_reopened = CONFIG_ONDEMAND_YES;

st = rrdset_find(RRD_TYPE_NET_STAT_NETFILTER "." RRD_TYPE_NET_STAT_SYNPROXY "_conn_reopened");

if(!st) {

st = rrdset_create(RRD_TYPE_NET_STAT_NETFILTER, RRD_TYPE_NET_STAT_SYNPROXY "_conn_reopened", NULL, RRD_TYPE_NET_STAT_SYNPROXY, NULL, "SYNPROXY Connections Reopened", "connections/s", 1003, update_every, RRDSET_TYPE_LINE);

rrddim_add(st, "reopened", NULL, 1, 1, RRDDIM_INCREMENTAL);

}

else rrdset_next(st);

rrddim_set(st, "reopened", conn_reopened);

rrdset_done(st);

}

// --------------------------------------------------------------------

if((do_cookies == CONFIG_ONDEMAND_ONDEMAND && events) || do_cookies == CONFIG_ONDEMAND_YES) {

do_cookies = CONFIG_ONDEMAND_YES;

st = rrdset_find(RRD_TYPE_NET_STAT_NETFILTER "." RRD_TYPE_NET_STAT_SYNPROXY "_cookies");

if(!st) {

st = rrdset_create(RRD_TYPE_NET_STAT_NETFILTER, RRD_TYPE_NET_STAT_SYNPROXY "_cookies", NULL, RRD_TYPE_NET_STAT_SYNPROXY, NULL, "SYNPROXY TCP Cookies", "cookies/s", 1002, update_every, RRDSET_TYPE_LINE);

rrddim_add(st, "valid", NULL, 1, 1, RRDDIM_INCREMENTAL);

rrddim_add(st, "invalid", NULL, -1, 1, RRDDIM_INCREMENTAL);

rrddim_add(st, "retransmits", NULL, 1, 1, RRDDIM_INCREMENTAL);

}

else rrdset_next(st);

rrddim_set(st, "valid", cookie_valid);

rrddim_set(st, "invalid", cookie_invalid);

rrddim_set(st, "retransmits", cookie_retrans);

rrdset_done(st);

}

return 0;

}