Max | 8066a41 | 2019-01-28 23:59:03 +0100 | [diff] [blame] | 1 | /* Simple Osmocom System Monitor (osysmon): Support for ping probe */ |
| 2 | |
| 3 | /* (C) 2018 by sysmocom - s.f.m.c. GmbH. |
| 4 | * Author: Max Suraev |
| 5 | * All Rights Reserved. |
| 6 | * |
| 7 | * SPDX-License-Identifier: GPL-2.0+ |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| 22 | * MA 02110-1301, USA. |
| 23 | */ |
| 24 | |
| 25 | #include <stdbool.h> |
| 26 | #include <errno.h> |
| 27 | |
| 28 | #include <oping.h> |
| 29 | |
| 30 | #include <osmocom/core/utils.h> |
| 31 | #include <osmocom/vty/vty.h> |
| 32 | #include <osmocom/vty/command.h> |
| 33 | |
| 34 | #include "osysmon.h" |
| 35 | #include "value_node.h" |
| 36 | |
| 37 | /*********************************************************************** |
| 38 | * Data model |
| 39 | ***********************************************************************/ |
| 40 | |
| 41 | #define BUFLEN 128 |
| 42 | |
| 43 | struct ping_state { |
| 44 | pingobj_t *ping_handle; |
| 45 | }; |
| 46 | |
| 47 | /* FIXME: replace with ping_iterator_count() once we bump requirements to liboping 1.10.0+ */ |
| 48 | static unsigned iterator_count(pingobj_t *p) |
| 49 | { |
| 50 | unsigned count = 0; |
| 51 | pingobj_iter_t *iter; |
| 52 | for (iter = ping_iterator_get(p); iter; iter = ping_iterator_next(iter)) |
| 53 | count++; |
| 54 | return count; |
| 55 | } |
| 56 | |
| 57 | /* Workaround for liboping issue https://github.com/octo/liboping/issues/43 */ |
| 58 | static int add_host(pingobj_t *pinger, const char *host) |
| 59 | { |
| 60 | int num_host = iterator_count(pinger), |
| 61 | rc = ping_host_add(pinger, host); |
| 62 | |
| 63 | if (rc < 0) { |
| 64 | if (num_host != iterator_count(pinger)) |
| 65 | ping_host_remove(pinger, host); |
| 66 | } |
| 67 | |
| 68 | return rc; |
| 69 | } |
| 70 | |
| 71 | |
| 72 | static bool add_drop(pingobj_iter_t *iter, struct value_node *vn_host) |
| 73 | { |
| 74 | char *s = NULL; |
| 75 | uint32_t drop, seq; |
| 76 | size_t len = sizeof(drop); |
| 77 | int rc = ping_iterator_get_info(iter, PING_INFO_DROPPED, &drop, &len); |
| 78 | if (rc) |
| 79 | return false; |
| 80 | |
| 81 | len = sizeof(seq); |
| 82 | rc = ping_iterator_get_info(iter, PING_INFO_SEQUENCE, &seq, &len); |
| 83 | if (rc) |
| 84 | return false; |
| 85 | |
| 86 | osmo_talloc_asprintf(vn_host, s, "%u/%u", drop, seq); |
| 87 | value_node_add(vn_host, "dropped", s); |
| 88 | |
| 89 | return true; |
| 90 | } |
| 91 | |
| 92 | static bool add_ttl(pingobj_iter_t *iter, struct value_node *vn_host) |
| 93 | { |
| 94 | int ttl, rc; |
| 95 | size_t len = sizeof(ttl); |
| 96 | |
| 97 | rc = ping_iterator_get_info(iter, PING_INFO_RECV_TTL, &ttl, &len); |
| 98 | if (rc) |
| 99 | return false; |
| 100 | |
| 101 | if (ttl > -1) { |
| 102 | char *s = NULL; |
| 103 | osmo_talloc_asprintf(vn_host, s, "%d", ttl); |
| 104 | value_node_add(vn_host, "TTL", s); |
| 105 | } |
| 106 | |
| 107 | return true; |
| 108 | } |
| 109 | |
| 110 | static bool add_latency(pingobj_iter_t *iter, struct value_node *vn_host) |
| 111 | { |
| 112 | double latency; |
| 113 | size_t len = sizeof(latency); |
| 114 | int rc = ping_iterator_get_info(iter, PING_INFO_LATENCY, &latency, &len); |
| 115 | if (rc) |
| 116 | return false; |
| 117 | |
| 118 | if (latency > -1) { |
| 119 | char *s = NULL; |
| 120 | osmo_talloc_asprintf(vn_host, s, "%.1lf ms", latency); |
| 121 | value_node_add(vn_host, "latency", s); |
| 122 | } |
| 123 | |
| 124 | return true; |
| 125 | } |
| 126 | |
| 127 | |
| 128 | /*********************************************************************** |
| 129 | * VTY |
| 130 | ***********************************************************************/ |
| 131 | |
| 132 | static struct cmd_node ping_node = { |
| 133 | PING_NODE, |
| 134 | "%s(config-ping)# ", |
| 135 | 1, |
| 136 | }; |
| 137 | |
| 138 | int osysmon_ping_go_parent(struct vty *vty) |
| 139 | { |
| 140 | switch (vty->node) { |
| 141 | case PING_NODE: |
| 142 | vty->node = CONFIG_NODE; |
| 143 | vty->index = NULL; |
| 144 | break; |
| 145 | default: |
| 146 | break; |
| 147 | } |
| 148 | return vty->node; |
| 149 | } |
| 150 | |
| 151 | #define PING_STR "Configure a host to be monitored/pinged\n" |
| 152 | |
| 153 | DEFUN(cfg_ping, cfg_ping_cmd, |
| 154 | "ping HOST", |
| 155 | PING_STR "Name of the host to ping\n") |
| 156 | { |
| 157 | int rc = add_host(g_oss->pings->ping_handle, argv[0]); |
| 158 | if (rc < 0) { |
| 159 | vty_out(vty, "[%d] Couldn't add pinger for %s: %s%s", |
| 160 | iterator_count(g_oss->pings->ping_handle), argv[0], |
| 161 | ping_get_error(g_oss->pings->ping_handle), VTY_NEWLINE); |
| 162 | |
| 163 | return CMD_WARNING; |
| 164 | } |
| 165 | |
| 166 | return CMD_SUCCESS; |
| 167 | } |
| 168 | |
| 169 | DEFUN(cfg_no_ping, cfg_no_ping_cmd, |
| 170 | "no ping HOST", |
| 171 | NO_STR PING_STR "Name of the host to ping\n") |
| 172 | { |
| 173 | int rc = ping_host_remove(g_oss->pings->ping_handle, argv[0]); |
| 174 | if (rc < 0) { |
| 175 | vty_out(vty, "[%d] Couldn't remove %s pinger: %s%s", |
| 176 | iterator_count(g_oss->pings->ping_handle), argv[0], |
| 177 | ping_get_error(g_oss->pings->ping_handle), VTY_NEWLINE); |
| 178 | |
| 179 | return CMD_WARNING; |
| 180 | } |
| 181 | |
| 182 | return CMD_SUCCESS; |
| 183 | } |
| 184 | |
| 185 | static int config_write_ping(struct vty *vty) |
| 186 | { |
| 187 | char buf[BUFLEN]; |
| 188 | pingobj_iter_t *iter; |
| 189 | for (iter = ping_iterator_get(g_oss->pings->ping_handle); iter; iter = ping_iterator_next(iter)) { |
| 190 | size_t len = BUFLEN; |
| 191 | /* hostname as it was supplied via vty 'ping' entry */ |
| 192 | if (ping_iterator_get_info(iter, PING_INFO_USERNAME, buf, &len)) |
| 193 | return CMD_WARNING; |
| 194 | |
| 195 | vty_out(vty, "ping %s%s", buf, VTY_NEWLINE); |
| 196 | } |
| 197 | |
| 198 | return CMD_SUCCESS; |
| 199 | } |
| 200 | |
| 201 | |
| 202 | /*********************************************************************** |
| 203 | * Runtime Code |
| 204 | ***********************************************************************/ |
| 205 | |
| 206 | /* called once on startup before config file parsing */ |
| 207 | int osysmon_ping_init() |
| 208 | { |
| 209 | install_element(CONFIG_NODE, &cfg_ping_cmd); |
| 210 | install_element(CONFIG_NODE, &cfg_no_ping_cmd); |
| 211 | install_node(&ping_node, config_write_ping); |
| 212 | |
| 213 | g_oss->pings = talloc_zero(NULL, struct ping_state); |
| 214 | if (!g_oss->pings) |
| 215 | return -ENOMEM; |
| 216 | |
| 217 | g_oss->pings->ping_handle = ping_construct(); |
| 218 | |
| 219 | if (g_oss->pings->ping_handle) |
| 220 | return 0; |
| 221 | |
| 222 | return -EINVAL; |
| 223 | } |
| 224 | |
| 225 | /* called periodically */ |
| 226 | int osysmon_ping_poll(struct value_node *parent) |
| 227 | { |
| 228 | char buf[BUFLEN]; |
| 229 | struct value_node *vn_host; |
| 230 | int num_host = iterator_count(g_oss->pings->ping_handle); |
| 231 | pingobj_iter_t *iter; |
| 232 | struct value_node *vn_ping = value_node_add(parent, "ping", NULL); |
| 233 | if (!vn_ping) |
| 234 | return -ENOMEM; |
| 235 | |
| 236 | for (iter = ping_iterator_get(g_oss->pings->ping_handle); iter; iter = ping_iterator_next(iter)) { |
| 237 | size_t len = BUFLEN; |
| 238 | int rc = ping_iterator_get_info(iter, PING_INFO_USERNAME, buf, &len); |
| 239 | if (rc) |
| 240 | return -EINVAL; |
| 241 | |
| 242 | vn_host = value_node_find_or_add(vn_ping, talloc_strdup(vn_ping, buf)); |
| 243 | if (!vn_host) |
| 244 | return -ENOMEM; |
| 245 | |
| 246 | len = BUFLEN; /* IP address is looked up on-call, even 40 bytes should be enough */ |
| 247 | rc = ping_iterator_get_info(iter, PING_INFO_ADDRESS, buf, &len); |
| 248 | if (rc) |
| 249 | return -EINVAL; |
| 250 | |
| 251 | value_node_add(vn_host, "IP", buf); |
| 252 | |
| 253 | add_drop(iter, vn_host); |
| 254 | |
| 255 | /* Parameters below might be absent from output depending on the host reachability: */ |
| 256 | add_latency(iter, vn_host); |
| 257 | add_ttl(iter, vn_host); |
| 258 | } |
| 259 | |
| 260 | if (num_host) |
| 261 | return ping_send(g_oss->pings->ping_handle); |
| 262 | |
| 263 | return 0; |
| 264 | } |