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   1 /*
   2     node_sim_nut.c -- Implementation of Node Simulation for Meshlink Testing
   3                     for meta connection test case 01 - re-connection of
   4                     two nodes when relay node goes down
   5     Copyright (C) 2019  Guus Sliepen <guus@meshlink.io>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License along
  18     with this program; if not, write to the Free Software Foundation, Inc.,
  19     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20 */
  21
  22 #ifdef NDEBUG
  23 #undef NDEBUG
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <pthread.h>
  30 #include <assert.h>
  31 #include <signal.h>
  32 #include <time.h>
  33 #include "../common/common_handlers.h"
  34 #include "../common/test_step.h"
  35 #include "../common/network_namespace_framework.h"
  36 #include "../../utils.h"
  37 #include "../run_blackbox_tests/test_optimal_pmtu.h"
  38
  39 extern bool test_pmtu_nut_running;
  40 extern bool test_pmtu_peer_running;
  41 extern bool test_pmtu_relay_running;
  42 extern struct sync_flag test_pmtu_nut_closed;
  43 extern bool ping_channel_enable_07;
  44
  45 static struct sync_flag peer_reachable = {.mutex  = PTHREAD_MUTEX_INITIALIZER, .cond = PTHREAD_COND_INITIALIZER};
  46 static struct sync_flag channel_opened = {.mutex  = PTHREAD_MUTEX_INITIALIZER, .cond = PTHREAD_COND_INITIALIZER};
  47
  48 static void node_status_cb(meshlink_handle_t *mesh, meshlink_node_t *node,
  49                            bool reachable);
  50 static void channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *dat, size_t len);
  51
  52 pmtu_attr_t node_pmtu[2];
  53 static time_t node_shutdown_time = 0;
  54 static bool mtu_set = true;
  55
  56 static void print_mtu_calc(pmtu_attr_t node_pmtu) {
  57         fprintf(stderr, "MTU size : %d\n", node_pmtu.mtu_size);
  58         fprintf(stderr, "Probes took for calculating PMTU discovery : %d\n", node_pmtu.mtu_discovery.probes);
  59         fprintf(stderr, "Probes total length took for calculating PMTU discovery : %d\n", node_pmtu.mtu_discovery.probes_total_len);
  60         fprintf(stderr, "Time took for calculating PMTU discovery : %lu\n", node_pmtu.mtu_discovery.time);
  61         fprintf(stderr, "Total MTU ping probes : %d\n", node_pmtu.mtu_ping.probes);
  62         fprintf(stderr, "Total MTU ping probes length : %d\n", node_pmtu.mtu_ping.probes_total_len);
  63         float avg = 0;
  64
  65         if(node_pmtu.mtu_ping.probes) {
  66                 avg = (float)node_pmtu.mtu_ping.time / (float)node_pmtu.mtu_ping.probes;
  67         }
  68
  69         fprintf(stderr, "Average MTU ping probes ping time : %f\n", avg);
  70         fprintf(stderr, "Total probes received %d\n", node_pmtu.mtu_recv_probes.probes);
  71         fprintf(stderr, "Total probes sent %d\n", node_pmtu.mtu_sent_probes.probes);
  72 }
  73
  74 // Node status callback
  75 static void node_status_cb(meshlink_handle_t *mesh, meshlink_node_t *node, bool reachable) {
  76         (void)mesh;
  77
  78         // Signal pthread_cond_wait if peer is reachable
  79         if(!strcasecmp(node->name, "peer") && reachable) {
  80                 set_sync_flag(&peer_reachable, true);
  81         }
  82
  83         return;
  84 }
  85
  86 // Channel poll callback
  87 static void poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t len) {
  88         (void)len;
  89         meshlink_set_channel_poll_cb(mesh, channel, NULL);
  90
  91         // Send data via channel to trigger UDP peer to peer hole punching
  92         assert(meshlink_channel_send(mesh, channel, "test", 5) >= 0);
  93         return;
  94 }
  95
  96 /* channel receive callback */
  97 static void channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *dat, size_t len) {
  98         if(len == 0) {
  99                 fail();
 100                 return;
 101         }
 102
 103         if(!strcmp(channel->node->name, "peer")) {
 104                 if(!memcmp(dat, "reply", 5)) {
 105                         set_sync_flag(&channel_opened, true);
 106                 } else if(!memcmp(dat, "test", 5)) {
 107                         assert(meshlink_channel_send(mesh, channel, "reply", 5) >= 0);
 108                 }
 109         }
 110
 111         return;
 112 }
 113
 114 // Meshlink log handler
 115 static void meshlink_logger(meshlink_handle_t *mesh, meshlink_log_level_t level,
 116                             const char *text) {
 117         (void)mesh;
 118         (void)level;
 119         int probe_len;
 120         int mtu_len;
 121         int probes;
 122         char node_name[100];
 123         int i = -1;
 124
 125         time_t cur_time;
 126         time_t probe_interval;
 127
 128         cur_time = time(NULL);
 129         assert(cur_time != -1);
 130
 131         if(node_shutdown_time && cur_time >= node_shutdown_time) {
 132                 test_pmtu_nut_running = false;
 133         }
 134
 135         if(level == MESHLINK_INFO) {
 136                 fprintf(stderr, "\x1b[32m nut:\x1b[0m %s\n", text);
 137         }
 138
 139         /* Calculate the MTU parameter values from the meshlink logs */
 140         if(sscanf(text, "Sending MTU probe length %d to %s", &probe_len, node_name) == 2) {
 141                 find_node_index(i, node_name);
 142                 node_pmtu[i].mtu_sent_probes.probes += 1;
 143                 node_pmtu[i].mtu_sent_probes.probes_total_len += probe_len;
 144
 145                 if(node_pmtu[i].mtu_size) {
 146                         if(node_pmtu[i].mtu_sent_probes.time > node_pmtu[i].mtu_recv_probes.time) {
 147                                 probe_interval = cur_time - node_pmtu[i].mtu_sent_probes.time;
 148                         } else {
 149                                 probe_interval = cur_time - node_pmtu[i].mtu_recv_probes.time;
 150                         }
 151
 152                         node_pmtu[i].mtu_ping.probes += 1;
 153                         node_pmtu[i].mtu_ping.time += probe_interval;
 154                         node_pmtu[i].mtu_ping.probes_total_len += probe_len;
 155                 }
 156
 157                 node_pmtu[i].mtu_sent_probes.time = cur_time;
 158
 159         } else if(sscanf(text, "Got MTU probe length %d from %s", &probe_len, node_name) == 2) {
 160                 find_node_index(i, node_name);
 161                 node_pmtu[i].mtu_recv_probes.probes += 1;
 162                 node_pmtu[i].mtu_recv_probes.probes_total_len += probe_len;
 163
 164                 if(node_pmtu[i].mtu_size) {
 165                         if(node_pmtu[i].mtu_sent_probes.time > node_pmtu[i].mtu_recv_probes.time) {
 166                                 probe_interval = cur_time - node_pmtu[i].mtu_sent_probes.time;
 167                         } else {
 168                                 probe_interval = cur_time - node_pmtu[i].mtu_recv_probes.time;
 169                         }
 170
 171                         node_pmtu[i].mtu_ping.probes += 1;
 172                         node_pmtu[i].mtu_ping.time += probe_interval;
 173                         node_pmtu[i].mtu_ping.probes_total_len += probe_len;
 174                 }
 175
 176                 node_pmtu[i].mtu_recv_probes.time = cur_time;
 177
 178         } else if(sscanf(text, "Fixing MTU of %s to %d after %d probes", node_name, &mtu_len, &probes) == 3) {
 179
 180                 if(!node_shutdown_time && !strcasecmp("peer", node_name) && mtu_set) {
 181                         node_shutdown_time = cur_time + PING_TRACK_TIMEOUT;
 182                         mtu_set = false;
 183                 }
 184
 185                 find_node_index(i, node_name);
 186                 node_pmtu[i].mtu_discovery.probes = node_pmtu[i].mtu_recv_probes.probes + node_pmtu[i].mtu_sent_probes.probes;
 187                 node_pmtu[i].mtu_discovery.probes_total_len = node_pmtu[i].mtu_sent_probes.probes_total_len + node_pmtu[i].mtu_recv_probes.probes_total_len;
 188                 node_pmtu[i].mtu_discovery.time = cur_time - node_pmtu[i].mtu_start.time;
 189                 node_pmtu[i].mtu_discovery.count += 1;
 190                 node_pmtu[i].mtu_size = mtu_len;
 191
 192         } else if(sscanf(text, "SPTPS key exchange with %s successful", node_name) == 1) {
 193                 find_node_index(i, node_name);
 194                 node_pmtu[i].mtu_start.time = cur_time;
 195                 node_pmtu[i].mtu_start.count += 1;
 196                 memset(&node_pmtu[i].mtu_discovery, 0, sizeof(struct pmtu_attr_para));
 197                 memset(&node_pmtu[i].mtu_ping, 0, sizeof(struct pmtu_attr_para));
 198                 memset(&node_pmtu[i].mtu_increase, 0, sizeof(struct pmtu_attr_para));
 199
 200         } else if(sscanf(text, "Increase in PMTU to %s detected, restarting PMTU discovery", node_name) == 1) {
 201                 find_node_index(i, node_name);
 202                 node_pmtu[i].mtu_increase.time = cur_time - node_pmtu[i].mtu_start.time;
 203                 node_pmtu[i].mtu_increase.count += 1;
 204
 205         } else if(sscanf(text, "Trying to send MTU probe to unreachable or rekeying node %s", node_name) == 1) {
 206
 207         } else if(sscanf(text, "%s did not respond to UDP ping, restarting PMTU discovery", node_name) == 1) {
 208
 209         } else if(sscanf(text, "No response to MTU probes from %s", node_name) == 1) {
 210
 211         } else if((sscanf(text, "Connection with %s activated", node_name) == 1) || (sscanf(text, "Already connected to %s", node_name) == 1)) {
 212
 213         } else if((sscanf(text, "Connection closed by %s", node_name) == 1) || (sscanf(text, "Closing connection with %s", node_name) == 1)) {
 214         }
 215 }
 216
 217 void *node_sim_pmtu_nut_01(void *arg) {
 218         mesh_arg_t *mesh_arg = (mesh_arg_t *)arg;
 219         struct timeval main_loop_wait = { 5, 0 };
 220
 221         set_sync_flag(&peer_reachable, false);
 222         set_sync_flag(&channel_opened, false);
 223         node_shutdown_time = 0;
 224         mtu_set = true;
 225
 226         // Run relay node instance
 227
 228         meshlink_handle_t *mesh;
 229         mesh = meshlink_open(mesh_arg->node_name, mesh_arg->confbase, mesh_arg->app_name, mesh_arg->dev_class);
 230         assert(mesh);
 231         meshlink_set_log_cb(mesh, MESHLINK_DEBUG, meshlink_logger);
 232         meshlink_set_node_status_cb(mesh, node_status_cb);
 233         sleep(1);
 234
 235         // Join relay node and if fails to join then try few more attempts
 236
 237         if(mesh_arg->join_invitation) {
 238                 int attempts;
 239                 bool join_ret;
 240
 241                 for(attempts = 0; attempts < 10; attempts++) {
 242                         join_ret = meshlink_join(mesh, mesh_arg->join_invitation);
 243
 244                         if(join_ret) {
 245                                 break;
 246                         }
 247
 248                         sleep(1);
 249                 }
 250
 251                 if(attempts == 10) {
 252                         fail();
 253                 }
 254         }
 255
 256         assert(meshlink_start(mesh));
 257
 258         // Wait for peer node to join
 259
 260         assert(wait_sync_flag(&peer_reachable, 10));
 261
 262         // Open a channel to peer node
 263
 264         meshlink_node_t *peer_node = meshlink_get_node(mesh, "peer");
 265         assert(peer_node);
 266         meshlink_channel_t *channel = meshlink_channel_open(mesh, peer_node, CHANNEL_PORT,
 267                                       channel_receive_cb, NULL, 0);
 268         meshlink_set_channel_poll_cb(mesh, channel, poll_cb);
 269
 270         assert(wait_sync_flag(&channel_opened, 30));
 271
 272         // All test steps executed - wait for signals to stop/start or close the mesh
 273
 274         time_t time_stamp, send_time;
 275
 276         time_stamp = time(NULL);
 277         send_time = time_stamp + 10;
 278
 279         while(test_pmtu_nut_running) {
 280                 select(1, NULL, NULL, NULL, &main_loop_wait);
 281
 282                 // Ping the channel for every 10 seconds if ping_channel_enable_07 is enabled
 283
 284                 if(ping_channel_enable_07) {
 285                         time_stamp = time(NULL);
 286
 287                         if(time_stamp >= send_time) {
 288                                 send_time = time_stamp + 10;
 289                                 assert(meshlink_channel_send(mesh, channel, "ping", 5) == 5);
 290                         }
 291                 }
 292         }
 293
 294         // Send MTU probe parameters data to the test driver
 295         meshlink_close(mesh);
 296
 297         set_sync_flag(&test_pmtu_nut_closed, true);
 298         fprintf(stderr, "NODE_PMTU_PEER :\n");
 299         print_mtu_calc(node_pmtu[NODE_PMTU_PEER]);
 300         fprintf(stderr, "\nNODE_PMTU_RELAY :\n");
 301         print_mtu_calc(node_pmtu[NODE_PMTU_RELAY]);
 302
 303         return NULL;
 304 }