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 accept_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint16_t port, const void *data, size_t len) {
  44         (void)port;
  45
  46         meshlink_set_channel_accept_cb(mesh, NULL);
  47         meshlink_set_channel_receive_cb(mesh, channel, b_receive_cb);
  48
  49         if(data) {
  50                 b_receive_cb(mesh, channel, data, len);
  51         }
  52
  53         return true;
  54 }
  55
  56 static void poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t len) {
  57         (void)len;
  58
  59         meshlink_set_channel_poll_cb(mesh, channel, NULL);
  60         set_sync_flag(channel->priv, true);
  61 }
  62
  63 static void poll_cb2(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t len) {
  64         (void)mesh;
  65         (void)channel;
  66
  67         a_poll_cb_len = len;
  68         meshlink_set_channel_poll_cb(mesh, channel, NULL);
  69         set_sync_flag(channel->priv, true);
  70 }
  71
  72 int main(void) {
  73         meshlink_set_log_cb(NULL, MESHLINK_DEBUG, log_cb);
  74         init_sync_flag(&b_responded);
  75         init_sync_flag(&b_closed);
  76
  77         meshlink_handle_t *a, *b;
  78         open_meshlink_pair(&a, &b, "channels-udp-cornercases");
  79
  80         // Set the callbacks.
  81
  82         meshlink_set_channel_accept_cb(b, accept_cb);
  83
  84         // Open a channel from a to b before starting the mesh.
  85
  86         meshlink_node_t *nb = meshlink_get_node(a, "b");
  87         assert(nb);
  88
  89         struct sync_flag channel_opened;
  90         init_sync_flag(&channel_opened);
  91
  92         meshlink_channel_t *channel = meshlink_channel_open_ex(a, nb, 7, a_receive_cb, &channel_opened, 0, MESHLINK_CHANNEL_UDP);
  93         assert(channel);
  94
  95         meshlink_set_channel_poll_cb(a, channel, poll_cb);
  96
  97         // Check that the channel isn't established yet and sending a packet at this point returns 0
  98         assert(meshlink_channel_send(a, channel, "test", 4) == 0);
  99         assert(wait_sync_flag(&channel_opened, 1) == false);
 100
 101         // Start MeshLink and wait for the channel to become connected.
 102         start_meshlink_pair(a, b);
 103
 104         assert(wait_sync_flag(&channel_opened, 15));
 105
 106         // Re-initialize everything
 107         meshlink_channel_close(a, channel);
 108         close_meshlink_pair(a, b);
 109         reset_sync_flag(&channel_opened);
 110         reset_sync_flag(&b_responded);
 111         reset_sync_flag(&b_closed);
 112         open_meshlink_pair(&a, &b, "channels-udp-cornercases");
 113
 114         meshlink_set_channel_accept_cb(b, accept_cb);
 115
 116         start_meshlink_pair(a, b);
 117
 118         // Create a channel to b
 119         nb = meshlink_get_node(a, "b");
 120         assert(nb);
 121
 122         channel = meshlink_channel_open_ex(a, nb, 7, a_receive_cb, &channel_opened, 0, MESHLINK_CHANNEL_UDP);
 123         assert(channel);
 124         meshlink_set_channel_poll_cb(a, channel, poll_cb);
 125
 126         assert(wait_sync_flag(&channel_opened, 15));
 127
 128         // Send a message to b
 129
 130         struct sync_flag channel_closed;
 131         init_sync_flag(&channel_closed);
 132         channel->priv = &channel_closed;
 133
 134         for(int i = 0; i < 10; i++) {
 135                 assert(meshlink_channel_send(a, channel, "Hello", 5) == 5);
 136
 137                 if(wait_sync_flag(&channel_closed, 1)) {
 138                         break;
 139                 }
 140         }
 141
 142         assert(wait_sync_flag(&channel_closed, 1));
 143
 144         wait_sync_flag(&b_responded, 1);
 145         wait_sync_flag(&b_closed, 1);
 146
 147         // Try to send data on a closed channel
 148
 149         for(int i = 0; i < 10; i++) {
 150                 if(meshlink_channel_send(a, channel, "Hello", 5) == -1) {
 151                         break;
 152                 }
 153
 154                 assert(i != 9);
 155                 usleep(10000);
 156         }
 157
 158         // Try to create a second channel
 159
 160         struct sync_flag channel_polled;
 161         init_sync_flag(&channel_polled);
 162
 163         meshlink_channel_t *channel2 = meshlink_channel_open_ex(a, nb, 7, a_receive_cb, &channel_polled, 0, MESHLINK_CHANNEL_UDP);
 164         assert(channel2);
 165         meshlink_set_channel_poll_cb(a, channel2, poll_cb2);
 166
 167         assert(wait_sync_flag(&channel_polled, 5));
 168
 169         assert(0 == a_poll_cb_len);
 170
 171         meshlink_channel_close(a, channel);
 172         meshlink_channel_close(a, channel2);
 173         close_meshlink_pair(a, b);
 174 }