git.meshlink.io Git - meshlink/blob - test/channels-udp-cornercases.c

   1 #define _GNU_SOURCE
   2
   3 #ifdef NDEBUG
   4 #undef NDEBUG
   5 #endif
   6
   7 #include <stdio.h>
   8 #include <unistd.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <sys/time.h>
  12 #include <assert.h>
  13 #include <pthread.h>
  14
  15 #include "../src/meshlink.h"
  16 #include "utils.h"
  17
  18 static struct sync_flag b_responded;
  19 static struct sync_flag b_closed;
  20 static size_t a_poll_cb_len;
  21
  22 static void a_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
  23         (void)mesh;
  24         (void)channel;
  25
  26         if(len == 5 && !memcmp(data, "Hello", 5)) {
  27                 set_sync_flag(&b_responded, true);
  28         } else if(len == 0) {
  29                 set_sync_flag(&b_closed, true);
  30                 set_sync_flag(channel->priv, true);
  31         }
  32 }
  33
  34 static void b_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
  35         // Send one message back, then close the channel.
  36         if(len) {
  37                 assert(meshlink_channel_send(mesh, channel, data, len) == (ssize_t)len);
  38         }
  39
  40         meshlink_channel_close(mesh, channel);
  41 }
  42
  43 static bool reject_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint16_t port, const void *data, size_t len) {
  44         (void)mesh;
  45         (void)channel;
  46         (void)port;
  47         (void)data;
  48         (void)len;
  49
  50         return false;
  51 }
  52
  53 static bool accept_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint16_t port, const void *data, size_t len) {
  54         (void)port;
  55
  56         meshlink_set_channel_accept_cb(mesh, NULL);
  57         meshlink_set_channel_receive_cb(mesh, channel, b_receive_cb);
  58
  59         if(data) {
  60                 b_receive_cb(mesh, channel, data, len);
  61         }
  62
  63         return true;
  64 }
  65
  66 static void poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t len) {
  67         (void)len;
  68
  69         meshlink_set_channel_poll_cb(mesh, channel, NULL);
  70         set_sync_flag(channel->priv, true);
  71 }
  72
  73 static void poll_cb2(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t len) {
  74         (void)mesh;
  75         (void)channel;
  76
  77         a_poll_cb_len = len;
  78         meshlink_set_channel_poll_cb(mesh, channel, NULL);
  79         set_sync_flag(channel->priv, true);
  80 }
  81
  82 int main(void) {
  83         meshlink_set_log_cb(NULL, MESHLINK_DEBUG, log_cb);
  84         init_sync_flag(&b_responded);
  85         init_sync_flag(&b_closed);
  86
  87         meshlink_handle_t *a, *b;
  88         open_meshlink_pair(&a, &b, "channels-udp-cornercases");
  89
  90         // Set the callbacks.
  91
  92         meshlink_set_channel_accept_cb(a, reject_cb);
  93         meshlink_set_channel_accept_cb(b, accept_cb);
  94
  95         // Open a channel from a to b before starting the mesh.
  96
  97         meshlink_node_t *nb = meshlink_get_node(a, "b");
  98         assert(nb);
  99
 100         struct sync_flag channel_opened;
 101         init_sync_flag(&channel_opened);
 102
 103         meshlink_channel_t *channel = meshlink_channel_open_ex(a, nb, 7, a_receive_cb, &channel_opened, 0, MESHLINK_CHANNEL_UDP);
 104         assert(channel);
 105
 106         meshlink_set_channel_poll_cb(a, channel, poll_cb);
 107
 108         // Check that the channel isn't established yet and sending a packet at this point returns 0
 109         assert(meshlink_channel_send(a, channel, "test", 4) == 0);
 110         assert(wait_sync_flag(&channel_opened, 1) == false);
 111
 112         // Start MeshLink and wait for the channel to become connected.
 113         start_meshlink_pair(a, b);
 114
 115         assert(wait_sync_flag(&channel_opened, 5));
 116
 117         // Re-initialize everything
 118         meshlink_channel_close(a, channel);
 119         close_meshlink_pair(a, b);
 120         reset_sync_flag(&channel_opened);
 121         reset_sync_flag(&b_responded);
 122         reset_sync_flag(&b_closed);
 123         open_meshlink_pair(&a, &b, "channels-udp-cornercases");
 124
 125         meshlink_set_channel_accept_cb(a, reject_cb);
 126         meshlink_set_channel_accept_cb(b, accept_cb);
 127
 128         start_meshlink_pair(a, b);
 129
 130         // Create a channel to b
 131         nb = meshlink_get_node(a, "b");
 132         assert(nb);
 133
 134         channel = meshlink_channel_open_ex(a, nb, 7, a_receive_cb, &channel_opened, 0, MESHLINK_CHANNEL_UDP);
 135         assert(channel);
 136         meshlink_set_channel_poll_cb(a, channel, poll_cb);
 137
 138         assert(wait_sync_flag(&channel_opened, 5));
 139
 140         // Send a message to b
 141
 142         struct sync_flag channel_closed;
 143         init_sync_flag(&channel_closed);
 144         channel->priv = &channel_closed;
 145
 146         for(int i = 0; i < 10; i++) {
 147                 assert(meshlink_channel_send(a, channel, "Hello", 5) == 5);
 148
 149                 if(wait_sync_flag(&channel_closed, 1)) {
 150                         break;
 151                 }
 152         }
 153
 154         assert(wait_sync_flag(&channel_closed, 1));
 155
 156         wait_sync_flag(&b_responded, 1);
 157         wait_sync_flag(&b_closed, 1);
 158
 159         // Try to create a second channel
 160
 161         struct sync_flag channel_polled;
 162         init_sync_flag(&channel_polled);
 163
 164         meshlink_channel_t *channel2 = meshlink_channel_open_ex(a, nb, 7, a_receive_cb, &channel_polled, 0, MESHLINK_CHANNEL_UDP);
 165         assert(channel2);
 166         meshlink_set_channel_poll_cb(a, channel2, poll_cb2);
 167
 168         assert(wait_sync_flag(&channel_polled, 5));
 169
 170         assert(0 == a_poll_cb_len);
 171
 172         meshlink_channel_close(a, channel);
 173         meshlink_channel_close(a, channel2);
 174         close_meshlink_pair(a, b);
 175 }