git.meshlink.io Git - utcp/blob - test.c

   1 #define _GNU_SOURCE
   2
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <stdarg.h>
   6 #include <string.h>
   7 #include <time.h>
   8 #include <errno.h>
   9 #include <sys/types.h>
  10 #include <sys/socket.h>
  11 #include <netdb.h>
  12 #include <poll.h>
  13
  14
  15 #include "utcp.h"
  16
  17 #define DIR_READ 1
  18 #define DIR_WRITE 2
  19
  20 struct utcp_connection *c;
  21 int dir = DIR_READ | DIR_WRITE;
  22 bool running = true;
  23 long inpktno;
  24 long outpktno;
  25 long dropfrom;
  26 long dropto;
  27 double reorder;
  28 long reorder_dist = 10;
  29 double dropin;
  30 double dropout;
  31 long total_out;
  32 long total_in;
  33
  34 char *reorder_data;
  35 size_t reorder_len;
  36 int reorder_countdown;
  37
  38 #if UTCP_DEBUG
  39 void debug(const char *format, ...) {
  40         struct timeval now;
  41         gettimeofday(&now, NULL);
  42         fprintf(stderr, "%lu.%lu ", now.tv_sec, now.tv_usec / 1000);
  43         va_list ap;
  44         va_start(ap, format);
  45         vfprintf(stderr, format, ap);
  46         va_end(ap);
  47 }
  48 #else
  49 #define debug(...)
  50 #endif
  51
  52 ssize_t do_recv(struct utcp_connection *c, const void *data, size_t len) {
  53         if(!data || !len) {
  54                 if(errno) {
  55                         debug("Error: %s\n", strerror(errno));
  56                         dir = 0;
  57                 } else {
  58                         dir &= ~DIR_WRITE;
  59                         debug("Connection closed by peer\n");
  60                 }
  61                 return -1;
  62         }
  63         return write(1, data, len);
  64 }
  65
  66 void do_accept(struct utcp_connection *nc, uint16_t port) {
  67         utcp_accept(nc, do_recv, NULL);
  68         c = nc;
  69         utcp_set_accept_cb(c->utcp, NULL, NULL);
  70 }
  71
  72 ssize_t do_send(struct utcp *utcp, const void *data, size_t len) {
  73         int s = *(int *)utcp->priv;
  74         outpktno++;
  75         if(outpktno >= dropfrom && outpktno < dropto) {
  76                 if(drand48() < dropout) {
  77                         debug("Dropped outgoing packet\n");
  78                         return len;
  79                 }
  80                 if(!reorder_data && drand48() < reorder) {
  81                         reorder_data = malloc(len);
  82                         if(!reorder_data) {
  83                                 debug("Out of memory\n");
  84                                 return len;
  85                         }
  86                         reorder_len = len;
  87                         memcpy(reorder_data, data, len);
  88                         reorder_countdown = 1 + drand48() * reorder_dist;
  89                         return len;
  90                 }
  91         }
  92
  93         if(reorder_data) {
  94                 if(--reorder_countdown < 0) {
  95                         total_out += reorder_len;
  96                         send(s, reorder_data, reorder_len, MSG_DONTWAIT);
  97                         free(reorder_data);
  98                         reorder_data = NULL;
  99                 }
 100         }
 101
 102         total_out += len;
 103         ssize_t result = send(s, data, len, MSG_DONTWAIT);
 104         if(result <= 0)
 105                 debug("Error sending UDP packet: %s\n", strerror(errno));
 106         return result;
 107 }
 108
 109 int main(int argc, char *argv[]) {
 110         srand(time(NULL));
 111         srand48(time(NULL));
 112
 113         if(argc < 2 || argc > 3)
 114                 return 1;
 115
 116         bool server = argc == 2;
 117         bool connected = false;
 118
 119         if(getenv("DROPIN")) dropin = atof(getenv("DROPIN"));
 120         if(getenv("DROPOUT")) dropout = atof(getenv("DROPOUT"));
 121         if(getenv("DROPFROM")) dropfrom = atoi(getenv("DROPFROM"));
 122         if(getenv("DROPTO")) dropto = atoi(getenv("DROPTO"));
 123         if(getenv("REORDER")) reorder = atof(getenv("REORDER"));
 124         if(getenv("REORDER_DIST")) reorder_dist = atoi(getenv("REORDER_DIST"));
 125
 126         if(dropto < dropfrom)
 127                 dropto = 1 << 30;
 128
 129         struct addrinfo *ai;
 130         struct addrinfo hint = {
 131                 .ai_flags = server ? AI_PASSIVE : 0,
 132                 .ai_socktype = SOCK_DGRAM,
 133         };
 134
 135         getaddrinfo(server ? NULL : argv[1], server ? argv[1] : argv[2], &hint, &ai);
 136         if(!ai)
 137                 return 1;
 138
 139         int s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 140         if(s == -1)
 141                 return 1;
 142
 143         if(server) {
 144                 if(bind(s, ai->ai_addr, ai->ai_addrlen))
 145                         return 1;
 146         } else {
 147                 if(connect(s, ai->ai_addr, ai->ai_addrlen))
 148                         return 1;
 149                 connected = true;
 150         }
 151
 152         freeaddrinfo(ai);
 153
 154         struct utcp *u = utcp_init(server ? do_accept : NULL, NULL, do_send, &s);
 155         if(!u)
 156                 return 1;
 157
 158         utcp_set_mtu(u, 1300);
 159         utcp_set_user_timeout(u, 10);
 160
 161         if(!server)
 162                 c = utcp_connect(u, 1, do_recv, NULL);
 163
 164         struct pollfd fds[2] = {
 165                 {.fd = 0, .events = POLLIN | POLLERR | POLLHUP},
 166                 {.fd = s, .events = POLLIN | POLLERR | POLLHUP},
 167         };
 168
 169         char buf[102400];
 170         struct timeval timeout = utcp_timeout(u);
 171
 172         while(!connected || utcp_is_active(u)) {
 173                 size_t max = c ? utcp_get_sndbuf_free(c) : 0;
 174                 if(max > sizeof buf)
 175                         max = sizeof buf;
 176
 177                 int timeout_ms = timeout.tv_sec * 1000 + timeout.tv_usec / 1000 + 1;
 178
 179                 debug("polling, dir = %d, timeout = %d\n", dir, timeout_ms);
 180                 if((dir & DIR_READ) && max)
 181                         poll(fds, 2, timeout_ms);
 182                 else
 183                         poll(fds + 1, 1, timeout_ms);
 184
 185                 if(fds[0].revents) {
 186                         fds[0].revents = 0;
 187                         debug("stdin\n");
 188                         ssize_t len = read(0, buf, max);
 189                         if(len <= 0) {
 190                                 fds[0].fd = -1;
 191                                 dir &= ~DIR_READ;
 192                                 if(c)
 193                                         utcp_shutdown(c, SHUT_WR);
 194                                 if(len == -1)
 195                                         break;
 196                                 else
 197                                         continue;
 198                         }
 199                         if(c) {
 200                                 ssize_t sent = utcp_send(c, buf, len);
 201                                 if(sent != len)
 202                                         debug("Short send: %zd != %zd\n", sent, len);
 203                         }
 204                 }
 205
 206                 if(fds[1].revents) {
 207                         fds[1].revents = 0;
 208                         debug("netin\n");
 209                         struct sockaddr_storage ss;
 210                         socklen_t sl = sizeof ss;
 211                         int len = recvfrom(s, buf, sizeof buf, MSG_DONTWAIT, (struct sockaddr *)&ss, &sl);
 212                         if(len <= 0) {
 213                                 debug("Error receiving UDP packet: %s\n", strerror(errno));
 214                                 break;
 215                         }
 216                         if(!connected)
 217                                 if(!connect(s, (struct sockaddr *)&ss, sl))
 218                                         connected = true;
 219                         inpktno++;
 220                         if(inpktno >= dropto || inpktno < dropfrom || drand48() >= dropin) {
 221                                 total_in += len;
 222                                 if(utcp_recv(u, buf, len) == -1)
 223                                         debug("Error receiving UTCP packet: %s\n", strerror(errno));
 224                         } else {
 225                                 debug("Dropped incoming packet\n");
 226                         }
 227                 }
 228
 229                 timeout = utcp_timeout(u);
 230         };
 231
 232         utcp_close(c);
 233         utcp_exit(u);
 234         free(reorder_data);
 235
 236         debug("Total bytes in: %ld, out: %ld\n", total_in, total_out);
 237
 238         return 0;
 239 }