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 FILE *reference;
  34 long mtu = 0;
  35
  36 char *reorder_data;
  37 size_t reorder_len;
  38 int reorder_countdown;
  39
  40 #if UTCP_DEBUG
  41 static void debug(const char *format, ...) {
  42         struct timespec tv;
  43         char buf[1024];
  44         int len;
  45
  46         clock_gettime(CLOCK_REALTIME, &tv);
  47         len = snprintf(buf, sizeof(buf), "%ld.%06lu ", (long)tv.tv_sec, tv.tv_nsec / 1000);
  48         va_list ap;
  49         va_start(ap, format);
  50         len += vsnprintf(buf + len, sizeof(buf) - len, format, ap);
  51         va_end(ap);
  52
  53         if(len > 0 && (size_t)len < sizeof(buf)) {
  54                 fwrite(buf, len, 1, stderr);
  55         }
  56 }
  57 #else
  58 #define debug(...) do {} while(0)
  59 #endif
  60
  61 ssize_t do_recv(struct utcp_connection *c, const void *data, size_t len) {
  62         (void)c;
  63
  64         if(!data || !len) {
  65                 if(errno) {
  66                         debug("Error: %s\n", strerror(errno));
  67                         dir = 0;
  68                 } else {
  69                         dir &= ~DIR_WRITE;
  70                         debug("Connection closed by peer\n");
  71                 }
  72
  73                 return -1;
  74         }
  75
  76         if(reference) {
  77                 char buf[len];
  78
  79                 if(fread(buf, len, 1, reference) != 1) {
  80                         debug("Error reading reference\n");
  81                         abort();
  82                 }
  83
  84                 if(memcmp(buf, data, len)) {
  85                         debug("Received data differs from reference\n");
  86                         abort();
  87                 }
  88         }
  89
  90         return write(1, data, len);
  91 }
  92
  93 void do_accept(struct utcp_connection *nc, uint16_t port) {
  94         (void)port;
  95         utcp_accept(nc, do_recv, NULL);
  96         c = nc;
  97         utcp_set_accept_cb(c->utcp, NULL, NULL);
  98 }
  99
 100 ssize_t do_send(struct utcp *utcp, const void *data, size_t len) {
 101         int s = *(int *)utcp->priv;
 102         outpktno++;
 103
 104         if(outpktno >= dropfrom && outpktno < dropto) {
 105                 if(drand48() < dropout) {
 106                         debug("Dropped outgoing packet\n");
 107                         return len;
 108                 }
 109
 110                 if(!reorder_data && drand48() < reorder) {
 111                         reorder_data = malloc(len);
 112
 113                         if(!reorder_data) {
 114                                 debug("Out of memory\n");
 115                                 return len;
 116                         }
 117
 118                         reorder_len = len;
 119                         memcpy(reorder_data, data, len);
 120                         reorder_countdown = 1 + drand48() * reorder_dist;
 121                         return len;
 122                 }
 123         }
 124
 125         if(reorder_data) {
 126                 if(--reorder_countdown < 0) {
 127                         total_out += reorder_len;
 128                         send(s, reorder_data, reorder_len, MSG_DONTWAIT);
 129                         free(reorder_data);
 130                         reorder_data = NULL;
 131                 }
 132         }
 133
 134         total_out += len;
 135         ssize_t result = send(s, data, len, MSG_DONTWAIT);
 136
 137         if(result <= 0) {
 138                 debug("Error sending UDP packet: %s\n", strerror(errno));
 139         }
 140
 141         return result;
 142 }
 143
 144 static void set_mtu(struct utcp *u, int s) {
 145         if(!mtu) {
 146                 socklen_t optlen = sizeof(mtu);
 147                 getsockopt(s, IPPROTO_IP, IP_MTU, &mtu, &optlen);
 148         }
 149
 150         if(!mtu || mtu == 65535) {
 151                 mtu = 1500;
 152         }
 153
 154         debug("Using MTU %lu\n", mtu);
 155
 156         utcp_set_mtu(u, mtu ? mtu - 48 : 1300);
 157 }
 158
 159 int main(int argc, char *argv[]) {
 160         srand(time(NULL));
 161         srand48(time(NULL));
 162
 163         if(argc < 2 || argc > 3) {
 164                 return 1;
 165         }
 166
 167         bool server = argc == 2;
 168         bool connected = false;
 169         uint32_t flags = UTCP_TCP;
 170         size_t read_size = 102400;
 171
 172         if(getenv("DROPIN")) {
 173                 dropin = atof(getenv("DROPIN"));
 174         }
 175
 176         if(getenv("DROPOUT")) {
 177                 dropout = atof(getenv("DROPOUT"));
 178         }
 179
 180         if(getenv("DROPFROM")) {
 181                 dropfrom = atoi(getenv("DROPFROM"));
 182         }
 183
 184         if(getenv("DROPTO")) {
 185                 dropto = atoi(getenv("DROPTO"));
 186         }
 187
 188         if(getenv("REORDER")) {
 189                 reorder = atof(getenv("REORDER"));
 190         }
 191
 192         if(getenv("REORDER_DIST")) {
 193                 reorder_dist = atoi(getenv("REORDER_DIST"));
 194         }
 195
 196         if(getenv("FLAGS")) {
 197                 flags = atoi(getenv("FLAGS"));
 198         }
 199
 200         if(getenv("READ_SIZE")) {
 201                 read_size = atoi(getenv("READ_SIZE"));
 202         }
 203
 204         if(getenv("MTU")) {
 205                 mtu = atoi(getenv("MTU"));
 206         }
 207
 208         char *reference_filename = getenv("REFERENCE");
 209
 210         if(reference_filename) {
 211                 reference = fopen(reference_filename, "r");
 212         }
 213
 214         if(dropto < dropfrom) {
 215                 dropto = 1 << 30;
 216         }
 217
 218         struct addrinfo *ai;
 219
 220         struct addrinfo hint = {
 221                 .ai_flags = server ? AI_PASSIVE : 0,
 222                 .ai_socktype = SOCK_DGRAM,
 223         };
 224
 225         getaddrinfo(server ? NULL : argv[1], server ? argv[1] : argv[2], &hint, &ai);
 226
 227         if(!ai) {
 228                 debug("Could not lookup address: %s\n", strerror(errno));
 229                 return 1;
 230         }
 231
 232         int s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 233
 234         if(s == -1) {
 235                 debug("Could not create socket: %s\n", strerror(errno));
 236                 return 1;
 237         }
 238
 239         static const int one = 1;
 240         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
 241
 242         if(server) {
 243                 if(bind(s, ai->ai_addr, ai->ai_addrlen)) {
 244                         debug("Could not bind: %s\n", strerror(errno));
 245                         return 1;
 246                 }
 247         } else {
 248                 if(connect(s, ai->ai_addr, ai->ai_addrlen)) {
 249                         debug("Could not connect: %s\n", strerror(errno));
 250                         return 1;
 251                 }
 252
 253                 connected = true;
 254         }
 255
 256         freeaddrinfo(ai);
 257
 258         struct utcp *u = utcp_init(server ? do_accept : NULL, NULL, do_send, &s);
 259
 260         if(!u) {
 261                 debug("Could not initialize UTCP\n");
 262                 return 1;
 263         }
 264
 265         utcp_set_user_timeout(u, 10);
 266
 267         if(!server) {
 268                 set_mtu(u, s);
 269                 c = utcp_connect_ex(u, 1, do_recv, NULL, flags);
 270         }
 271
 272         struct pollfd fds[2] = {
 273                 {.fd = 0, .events = POLLIN | POLLERR | POLLHUP},
 274                 {.fd = s, .events = POLLIN | POLLERR | POLLHUP},
 275         };
 276
 277         char buf[102400];
 278
 279         struct timeval timeout = utcp_timeout(u);
 280
 281         while(!connected || utcp_is_active(u)) {
 282                 size_t max = c ? utcp_get_sndbuf_free(c) : 0;
 283
 284                 if(max > sizeof(buf)) {
 285                         max = sizeof(buf);
 286                 }
 287
 288                 if(max > read_size) {
 289                         max = read_size;
 290                 }
 291
 292                 int timeout_ms = timeout.tv_sec * 1000 + timeout.tv_usec / 1000 + 1;
 293
 294                 debug("polling, dir = %d, timeout = %d\n", dir, timeout_ms);
 295
 296                 if((dir & DIR_READ) && max) {
 297                         poll(fds, 2, timeout_ms);
 298                 } else {
 299                         poll(fds + 1, 1, timeout_ms);
 300                 }
 301
 302                 if(fds[0].revents) {
 303                         fds[0].revents = 0;
 304                         ssize_t len = read(0, buf, max);
 305                         debug("stdin %zd\n", len);
 306
 307                         if(len <= 0) {
 308                                 fds[0].fd = -1;
 309                                 dir &= ~DIR_READ;
 310
 311                                 if(c) {
 312                                         utcp_shutdown(c, SHUT_WR);
 313                                 }
 314
 315                                 if(len == -1) {
 316                                         break;
 317                                 } else {
 318                                         continue;
 319                                 }
 320                         }
 321
 322                         if(c) {
 323                                 ssize_t sent = utcp_send(c, buf, len);
 324
 325                                 if(sent != len) {
 326                                         debug("Short send: %zd != %zd\n", sent, len);
 327                                 }
 328                         }
 329                 }
 330
 331                 if(fds[1].revents) {
 332                         fds[1].revents = 0;
 333                         struct sockaddr_storage ss;
 334                         socklen_t sl = sizeof(ss);
 335                         int len = recvfrom(s, buf, sizeof(buf), MSG_DONTWAIT, (struct sockaddr *)&ss, &sl);
 336                         debug("netin %zu\n", len);
 337
 338                         if(len <= 0) {
 339                                 debug("Error receiving UDP packet: %s\n", strerror(errno));
 340                                 break;
 341                         }
 342
 343                         if(!connected) {
 344                                 if(!connect(s, (struct sockaddr *)&ss, sl)) {
 345                                         connected = true;
 346                                         set_mtu(u, s);
 347                                 }
 348                         }
 349
 350                         inpktno++;
 351
 352                         if(inpktno >= dropto || inpktno < dropfrom || drand48() >= dropin) {
 353                                 total_in += len;
 354
 355                                 if(utcp_recv(u, buf, len) == -1) {
 356                                         debug("Error receiving UTCP packet: %s\n", strerror(errno));
 357                                 }
 358                         } else {
 359                                 debug("Dropped incoming packet\n");
 360                         }
 361                 }
 362
 363                 timeout = utcp_timeout(u);
 364         };
 365
 366         utcp_close(c);
 367
 368         utcp_exit(u);
 369
 370         free(reorder_data);
 371
 372         debug("Total bytes in: %ld, out: %ld\n", total_in, total_out);
 373
 374         return 0;
 375 }