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