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

   1 #define _GNU_SOURCE
   2
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <time.h>
   7 #include <errno.h>
   8 #include <sys/types.h>
   9 #include <sys/socket.h>
  10 #include <netdb.h>
  11 #include <poll.h>
  12
  13
  14 #include "utcp.h"
  15
  16 #define DIR_READ 1
  17 #define DIR_WRITE 2
  18
  19 struct utcp_connection *c;
  20 int dir = DIR_READ | DIR_WRITE;
  21 bool running = true;
  22 double dropin;
  23 double dropout;
  24
  25 ssize_t do_recv(struct utcp_connection *c, const void *data, size_t len) {
  26         if(!data || !len) {
  27                 if(errno) {
  28                         fprintf(stderr, "Error: %s\n", strerror(errno));
  29                         dir = 0;
  30                 } else {
  31                         dir &= ~DIR_WRITE;
  32                         fprintf(stderr, "Connection closed by peer\n");
  33                 }
  34                 return -1;
  35         }
  36         return write(1, data, len);
  37 }
  38
  39 void do_accept(struct utcp_connection *nc, uint16_t port) {
  40         utcp_accept(nc, do_recv, NULL);
  41         c = nc;
  42 }
  43
  44 ssize_t do_send(struct utcp *utcp, const void *data, size_t len) {
  45         int s = *(int *)utcp->priv;
  46         if(drand48() < dropout)
  47                 return len;
  48
  49         ssize_t result = send(s, data, len, MSG_DONTWAIT);
  50         if(result <= 0)
  51                 fprintf(stderr, "Error sending UDP packet: %s\n", strerror(errno));
  52         return result;
  53 }
  54
  55 int main(int argc, char *argv[]) {
  56         srand(time(NULL));
  57         srand48(time(NULL));
  58
  59         if(argc < 2 || argc > 3)
  60                 return 1;
  61
  62         bool server = argc == 2;
  63         bool connected = false;
  64
  65         dropin = atof(getenv("DROPIN") ?: "0");
  66         dropout = atof(getenv("DROPOUT") ?: "0");
  67
  68         struct addrinfo *ai;
  69         struct addrinfo hint = {
  70                 .ai_flags = server ? AI_PASSIVE : 0,
  71                 .ai_socktype = SOCK_DGRAM,
  72         };
  73
  74         getaddrinfo(server ? NULL : argv[1], server ? argv[1] : argv[2], &hint, &ai);
  75         if(!ai)
  76                 return 1;
  77
  78         int s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
  79         if(s == -1)
  80                 return 1;
  81
  82         if(server) {
  83                 if(bind(s, ai->ai_addr, ai->ai_addrlen))
  84                         return 1;
  85         } else {
  86                 if(connect(s, ai->ai_addr, ai->ai_addrlen))
  87                         return 1;
  88                 connected = true;
  89         }
  90
  91         freeaddrinfo(ai);
  92
  93         struct utcp *u = utcp_init(server ? do_accept : NULL, NULL, do_send, &s);
  94         if(!u)
  95                 return 1;
  96
  97         utcp_set_mtu(u, 1300);
  98         utcp_set_user_timeout(u, 10);
  99
 100         if(!server)
 101                 c = utcp_connect(u, 1, do_recv, NULL);
 102
 103         struct pollfd fds[2] = {
 104                 {.fd = 0, .events = POLLIN | POLLERR | POLLHUP},
 105                 {.fd = s, .events = POLLIN | POLLERR | POLLHUP},
 106         };
 107
 108         char buf[102400];
 109         struct timeval timeout = utcp_timeout(u);
 110
 111         while(dir) {
 112                 size_t max = c ? utcp_get_sndbuf_free(c) : 0;
 113                 if(max > sizeof buf)
 114                         max = sizeof buf;
 115
 116                 if((dir & DIR_READ) && max)
 117                         poll(fds, 2, timeout.tv_sec * 1000 + timeout.tv_usec / 1000);
 118                 else
 119                         poll(fds + 1, 1, timeout.tv_sec * 1000 + timeout.tv_usec / 1000);
 120
 121                 if(fds[0].revents) {
 122                         fds[0].revents = 0;
 123                         fprintf(stderr, "0");
 124                         ssize_t len = read(0, buf, max);
 125                         if(len <= 0) {
 126                                 fds[0].fd = -1;
 127                                 dir &= ~DIR_READ;
 128                                 if(c)
 129                                         utcp_shutdown(c, SHUT_WR);
 130                                 if(len == -1)
 131                                         break;
 132                                 else
 133                                         continue;
 134                         }
 135                         if(c) {
 136                                 ssize_t sent = utcp_send(c, buf, len);
 137                                 if(sent != len)
 138                                         fprintf(stderr, "PANIEK: %zd != %zd\n", sent, len);
 139                         }
 140                 }
 141
 142                 if(fds[1].revents) {
 143                         fds[1].revents = 0;
 144                         fprintf(stderr, "1");
 145                         struct sockaddr_storage ss;
 146                         socklen_t sl = sizeof ss;
 147                         int len = recvfrom(s, buf, sizeof buf, MSG_DONTWAIT, (struct sockaddr *)&ss, &sl);
 148                         if(len <= 0) {
 149                                 fprintf(stderr, "Error receiving UDP packet: %s\n", strerror(errno));
 150                                 break;
 151                         }
 152                         if(!connected)
 153                                 if(!connect(s, (struct sockaddr *)&ss, sl))
 154                                         connected = true;
 155                         if(drand48() >= dropin)
 156                                 utcp_recv(u, buf, len);
 157                 }
 158
 159                 timeout = utcp_timeout(u);
 160         };
 161
 162         utcp_close(c);
 163         utcp_exit(u);
 164
 165         return 0;
 166 }