2 * collectd - src/synproxy.c
3 * Copyright (C) 2017 Marek Becka
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Marek Becka <https://github.com/marekbecka>
28 #error "No applicable input method."
31 #define SYNPROXY_FIELDS 6
33 static const char *synproxy_stat_path = "/proc/net/stat/synproxy";
35 static const char *column_names[SYNPROXY_FIELDS] = {
36 "entries", "syn_received", "invalid", "valid", "retransmission", "reopened"
38 static const char *column_types[SYNPROXY_FIELDS] = {
39 "current_connections", "connections", "cookies", "cookies", "cookies",
43 static void synproxy_submit(value_t *results) {
44 value_list_t vl = VALUE_LIST_INIT;
46 /* 1st column (entries) is hardcoded to 0 in kernel code */
47 for (size_t n = 1; n < SYNPROXY_FIELDS; n++) {
48 vl.values = &results[n];
51 sstrncpy(vl.plugin, "synproxy", sizeof(vl.plugin));
52 sstrncpy(vl.type, column_types[n], sizeof(vl.type));
53 sstrncpy(vl.type_instance, column_names[n], sizeof(vl.type_instance));
55 plugin_dispatch_values(&vl);
59 static int synproxy_read(void) {
61 value_t results[SYNPROXY_FIELDS];
62 int is_header = 1, status = 0;
64 FILE *fh = fopen(synproxy_stat_path, "r");
66 ERROR("synproxy plugin: unable to open %s", synproxy_stat_path);
70 memset(results, 0, sizeof(results));
72 while (fgets(buf, sizeof(buf), fh) != NULL) {
73 char *fields[SYNPROXY_FIELDS], *endprt;
80 int numfields = strsplit(buf, fields, STATIC_ARRAY_SIZE(fields));
81 if (numfields != SYNPROXY_FIELDS) {
82 ERROR("synproxy plugin: unexpected number of columns in %s",
88 /* 1st column (entries) is hardcoded to 0 in kernel code */
89 for (size_t n = 1; n < SYNPROXY_FIELDS; n++) {
93 results[n].derive += strtoull(fields[n], &endprt, 16);
94 if ((endptr == fields[n]) || errno != 0) {
95 ERROR("synproxy plugin: unable to parse value: %s", fields[n]);
105 synproxy_submit(results);
111 void module_register(void) {
112 plugin_register_read("synproxy", synproxy_read);
113 } /* void module_register */