listen.c

   1 #include <assert.h>
   2 #include <netdb.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <sys/socket.h>
   6 #include <unistd.h>
   7
   8 #include "listen.h"
   9
  10 // ----
  11 // Peer
  12 // ----
  13
  14 static bool dragonnet_peer_init_accepted(DragonnetPeer *p, int sock,
  15                 struct sockaddr_in6 addr, DragonnetListener *l)
  16 {
  17         pthread_rwlock_init(&p->mu, NULL);
  18         pthread_rwlock_wrlock(&p->mu);
  19
  20         p->sock = sock;
  21         p->laddr = l->laddr;
  22         p->raddr = dragonnet_addr_parse_sock(addr);
  23
  24         pthread_rwlock_unlock(&p->mu);
  25         return true;
  26 }
  27
  28 static DragonnetPeer *dragonnet_peer_accept(int sock, struct sockaddr_in6 addr,
  29                 DragonnetListener *l)
  30 {
  31         DragonnetPeer *p = malloc(sizeof *p);
  32         if (!dragonnet_peer_init_accepted(p, sock, addr, l)) {
  33                 dragonnet_peer_delete(p);
  34                 return NULL;
  35         }
  36
  37         return p;
  38 }
  39
  40 // --------
  41 // Listener
  42 // --------
  43
  44 DragonnetListener *dragonnet_listener_new(char *addr,
  45                 void (*on_connect)(DragonnetPeer *p))
  46 {
  47         DragonnetListener *l = malloc(sizeof *l);
  48         pthread_rwlock_init(&l->mu, NULL);
  49         pthread_rwlock_wrlock(&l->mu);
  50
  51         l->sock = socket(AF_INET6, SOCK_STREAM, 0);
  52         l->on_connect = on_connect;
  53
  54         int so_reuseaddr = 1;
  55         if (setsockopt(l->sock, SOL_SOCKET, SO_REUSEADDR, &so_reuseaddr,
  56                         sizeof so_reuseaddr) < 0) {
  57                 perror("setsockopt");
  58                 dragonnet_listener_delete(l);
  59                 return NULL;
  60         }
  61
  62         l->laddr = dragonnet_addr_parse_str(addr);
  63         struct sockaddr_in6 ai_addr = dragonnet_addr_sock(l->laddr);
  64
  65         if (bind(l->sock, (const struct sockaddr *) &ai_addr, sizeof ai_addr) < 0) {
  66                 perror("bind");
  67                 dragonnet_listener_delete(l);
  68                 return NULL;
  69         }
  70
  71         if (listen(l->sock, 10) < 0) {
  72                 perror("listen");
  73                 dragonnet_listener_delete(l);
  74                 return NULL;
  75         }
  76
  77         pthread_rwlock_unlock(&l->mu);
  78         return l;
  79 }
  80
  81 void dragonnet_listener_run(DragonnetListener *l)
  82 {
  83         pthread_rwlock_wrlock(&l->mu);
  84
  85         assert(l->state == DRAGONNET_LISTENER_CREATED);
  86         l->state++;
  87
  88         pthread_rwlock_unlock(&l->mu);
  89
  90         while (l->state == DRAGONNET_LISTENER_ACTIVE) {
  91                 struct sockaddr_in6 clt_addr;
  92                 socklen_t clt_addrlen = sizeof clt_addr;
  93
  94                 int clt_sock = accept(l->sock, (struct sockaddr *) &clt_addr, &clt_addrlen);
  95                 if (clt_sock < 0) {
  96                         perror("accept");
  97                         continue;
  98                 }
  99
 100                 DragonnetPeer *p = dragonnet_peer_accept(clt_sock, clt_addr, l);
 101                 if (p == NULL)
 102                         continue;
 103
 104                 if (l->on_connect != NULL)
 105                         l->on_connect(p);
 106         }
 107 }
 108
 109 void dragonnet_listener_close(DragonnetListener *l)
 110 {
 111         pthread_rwlock_wrlock(&l->mu);
 112
 113         assert(l->state == DRAGONNET_LISTENER_ACTIVE);
 114         close(l->sock);
 115         l->sock = 0;
 116         l->state++;
 117
 118         pthread_rwlock_unlock(&l->mu);
 119 }
 120
 121 void dragonnet_listener_delete(DragonnetListener *l)
 122 {
 123         pthread_rwlock_destroy(&l->mu);
 124         free(l);
 125 }