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