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 struct utcp_connection *c;
  17 int dir = 3;
  18 bool running = true;
  19 double dropin;
  20 double dropout;
  21
  22 int do_recv(struct utcp_connection *c, const void *data, size_t len) {
  23         if(!data || !len) {
  24                 if(errno) {
  25                         fprintf(stderr, "Error: %s\n", strerror(errno));
  26                         dir = 0;
  27                 } else {
  28                         dir &= ~2;
  29                         fprintf(stderr, "Connection closed by peer\n");
  30                 }
  31                 return 0;
  32         }
  33         return write(1, data, len);
  34 }
  35
  36 void do_accept(struct utcp_connection *nc, uint16_t port) {
  37         utcp_accept(nc, do_recv, NULL);
  38         c = nc;
  39 }
  40
  41 int do_send(struct utcp *utcp, const void *data, size_t len) {
  42         int s = *(int *)utcp->priv;
  43         if(drand48() >= dropout)
  44                 return send(s, data, len, MSG_DONTWAIT);
  45         else
  46                 return 0;
  47 }
  48
  49 int main(int argc, char *argv[]) {
  50         srand(time(NULL));
  51         srand48(time(NULL));
  52
  53         if(argc < 2 || argc > 3)
  54                 return 1;
  55
  56         bool server = argc == 2;
  57         bool connected = false;
  58
  59         dropin = atof(getenv("DROPIN") ?: "0");
  60         dropout = atof(getenv("DROPOUT") ?: "0");
  61
  62         struct addrinfo *ai;
  63         struct addrinfo hint = {
  64                 .ai_flags = server ? AI_PASSIVE : 0,
  65                 .ai_socktype = SOCK_DGRAM,
  66         };
  67
  68         getaddrinfo(server ? NULL : argv[1], server ? argv[1] : argv[2], &hint, &ai);
  69         if(!ai)
  70                 return 1;
  71
  72         int s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
  73         if(s < 0)
  74                 return 1;
  75
  76         if(server) {
  77                 if(bind(s, ai->ai_addr, ai->ai_addrlen))
  78                         return 1;
  79         } else {
  80                 if(connect(s, ai->ai_addr, ai->ai_addrlen))
  81                         return 1;
  82                 connected = true;
  83         }
  84
  85         struct utcp *u = utcp_init(server ? do_accept : NULL, NULL, do_send, &s);
  86         if(!u)
  87                 return 1;
  88
  89         utcp_set_user_timeout(u, 10);
  90
  91         if(!server)
  92                 c = utcp_connect(u, 1, do_recv, NULL);
  93
  94         struct pollfd fds[2] = {
  95                 {.fd = 0, .events = POLLIN | POLLERR | POLLHUP},
  96                 {.fd = s, .events = POLLIN | POLLERR | POLLHUP},
  97         };
  98
  99         char buf[1024];
 100         int timeout = utcp_timeout(u);
 101
 102         while(dir) {
 103                 poll(fds, 2, timeout);
 104
 105                 if(fds[0].revents) {
 106                         int len = read(0, buf, sizeof buf);
 107                         if(len <= 0) {
 108                                 fds[0].fd = -1;
 109                                 dir &= ~1;
 110                                 if(c)
 111                                         utcp_shutdown(c, SHUT_WR);
 112                                 if(len < 0)
 113                                         break;
 114                                 else
 115                                         continue;
 116                         }
 117                         if(c)
 118                                 utcp_send(c, buf, len);
 119                 }
 120
 121                 if(fds[1].revents) {
 122                         struct sockaddr_storage ss;
 123                         socklen_t sl;
 124                         int len = recvfrom(s, buf, sizeof buf, MSG_DONTWAIT, (struct sockaddr *)&ss, &sl);
 125                         if(len <= 0)
 126                                 break;
 127                         if(!connected)
 128                                 if(!connect(s, (struct sockaddr *)&ss, sl))
 129                                         connected = true;
 130                         if(drand48() >= dropin)
 131                                 utcp_recv(u, buf, len);
 132                 }
 133
 134                 timeout = utcp_timeout(u);
 135         };
 136
 137         utcp_close(c);
 138         utcp_exit(u);
 139
 140         return 0;
 141 }