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 dropin;
  28 double dropout;
  29 long total_out;
  30 long total_in;
  31
  32
  33 void debug(const char *format, ...) {
  34         struct timeval now;
  35         gettimeofday(&now, NULL);
  36         fprintf(stderr, "%lu.%lu ", now.tv_sec, now.tv_usec / 1000);
  37         va_list ap;
  38         va_start(ap, format);
  39         vfprintf(stderr, format, ap);
  40         va_end(ap);
  41 }
  42
  43 ssize_t do_recv(struct utcp_connection *c, const void *data, size_t len) {
  44         if(!data || !len) {
  45                 if(errno) {
  46                         debug("Error: %s\n", strerror(errno));
  47                         dir = 0;
  48                 } else {
  49                         dir &= ~DIR_WRITE;
  50                         debug("Connection closed by peer\n");
  51                 }
  52                 return -1;
  53         }
  54         return write(1, data, len);
  55 }
  56
  57 void do_accept(struct utcp_connection *nc, uint16_t port) {
  58         utcp_accept(nc, do_recv, NULL);
  59         c = nc;
  60         utcp_set_accept_cb(c->utcp, NULL, NULL);
  61 }
  62
  63 ssize_t do_send(struct utcp *utcp, const void *data, size_t len) {
  64         int s = *(int *)utcp->priv;
  65         outpktno++;
  66         if(outpktno < dropto && outpktno >= dropfrom && drand48() < dropout)
  67                 return len;
  68
  69         total_out += len;
  70         ssize_t result = send(s, data, len, MSG_DONTWAIT);
  71         if(result <= 0)
  72                 debug("Error sending UDP packet: %s\n", strerror(errno));
  73         return result;
  74 }
  75
  76 int main(int argc, char *argv[]) {
  77         srand(time(NULL));
  78         srand48(time(NULL));
  79
  80         if(argc < 2 || argc > 3)
  81                 return 1;
  82
  83         bool server = argc == 2;
  84         bool connected = false;
  85
  86         dropin = atof(getenv("DROPIN") ?: "0");
  87         dropout = atof(getenv("DROPOUT") ?: "0");
  88         dropfrom = atoi(getenv("DROPFROM") ?: "0");
  89         dropto = atoi(getenv("DROPTO") ?: "0");
  90
  91         struct addrinfo *ai;
  92         struct addrinfo hint = {
  93                 .ai_flags = server ? AI_PASSIVE : 0,
  94                 .ai_socktype = SOCK_DGRAM,
  95         };
  96
  97         getaddrinfo(server ? NULL : argv[1], server ? argv[1] : argv[2], &hint, &ai);
  98         if(!ai)
  99                 return 1;
 100
 101         int s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 102         if(s == -1)
 103                 return 1;
 104
 105         if(server) {
 106                 if(bind(s, ai->ai_addr, ai->ai_addrlen))
 107                         return 1;
 108         } else {
 109                 if(connect(s, ai->ai_addr, ai->ai_addrlen))
 110                         return 1;
 111                 connected = true;
 112         }
 113
 114         freeaddrinfo(ai);
 115
 116         struct utcp *u = utcp_init(server ? do_accept : NULL, NULL, do_send, &s);
 117         if(!u)
 118                 return 1;
 119
 120         utcp_set_mtu(u, 1300);
 121         utcp_set_user_timeout(u, 10);
 122
 123         if(!server)
 124                 c = utcp_connect(u, 1, do_recv, NULL);
 125
 126         struct pollfd fds[2] = {
 127                 {.fd = 0, .events = POLLIN | POLLERR | POLLHUP},
 128                 {.fd = s, .events = POLLIN | POLLERR | POLLHUP},
 129         };
 130
 131         char buf[102400];
 132         struct timeval timeout = utcp_timeout(u);
 133
 134         while(!connected || utcp_is_active(u)) {
 135                 size_t max = c ? utcp_get_sndbuf_free(c) : 0;
 136                 if(max > sizeof buf)
 137                         max = sizeof buf;
 138
 139                 int timeout_ms = timeout.tv_sec * 1000 + timeout.tv_usec / 1000 + 1;
 140
 141                 debug("polling, dir = %d, timeout = %d\n", dir, timeout_ms);
 142                 if((dir & DIR_READ) && max)
 143                         poll(fds, 2, timeout_ms);
 144                 else
 145                         poll(fds + 1, 1, timeout_ms);
 146
 147                 if(fds[0].revents) {
 148                         fds[0].revents = 0;
 149                         debug("stdin\n");
 150                         ssize_t len = read(0, buf, max);
 151                         if(len <= 0) {
 152                                 fds[0].fd = -1;
 153                                 dir &= ~DIR_READ;
 154                                 if(c)
 155                                         utcp_shutdown(c, SHUT_WR);
 156                                 if(len == -1)
 157                                         break;
 158                                 else
 159                                         continue;
 160                         }
 161                         if(c) {
 162                                 ssize_t sent = utcp_send(c, buf, len);
 163                                 if(sent != len)
 164                                         debug("Short send: %zd != %zd\n", sent, len);
 165                         }
 166                 }
 167
 168                 if(fds[1].revents) {
 169                         fds[1].revents = 0;
 170                         debug("netin\n");
 171                         struct sockaddr_storage ss;
 172                         socklen_t sl = sizeof ss;
 173                         int len = recvfrom(s, buf, sizeof buf, MSG_DONTWAIT, (struct sockaddr *)&ss, &sl);
 174                         if(len <= 0) {
 175                                 debug("Error receiving UDP packet: %s\n", strerror(errno));
 176                                 break;
 177                         }
 178                         if(!connected)
 179                                 if(!connect(s, (struct sockaddr *)&ss, sl))
 180                                         connected = true;
 181                         inpktno++;
 182                         if(inpktno >= dropto || inpktno < dropfrom || drand48() >= dropin) {
 183                                 total_in += len;
 184                                 utcp_recv(u, buf, len);
 185                         }
 186                 }
 187
 188                 timeout = utcp_timeout(u);
 189         };
 190
 191         utcp_close(c);
 192         utcp_exit(u);
 193
 194         debug("Total bytes in: %ld, out: %ld\n", total_in, total_out);
 195
 196         return 0;
 197 }