listen.c

   1 #include <assert.h>
   2 #include <dragonnet/listen.h>
   3 #include <dragonnet/recv.h>
   4 #include <netdb.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <sys/socket.h>
   8 #include <unistd.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         pthread_rwlock_rdlock(&l->mu);
  21         p->sock = sock;
  22         p->laddr = l->laddr;
  23         p->raddr = dragonnet_addr_parse_sock(addr);
  24         p->on_recv_type = l->on_recv_type;
  25         pthread_rwlock_unlock(&l->mu);
  26
  27         pthread_rwlock_unlock(&p->mu);
  28         return true;
  29 }
  30
  31 static DragonnetPeer *dragonnet_peer_accept(int sock, struct sockaddr_in6 addr,
  32                 DragonnetListener *l)
  33 {
  34         DragonnetPeer *p = malloc(sizeof *p);
  35         if (!dragonnet_peer_init_accepted(p, sock, addr, l)) {
  36                 dragonnet_peer_delete(p);
  37                 return NULL;
  38         }
  39
  40         return p;
  41 }
  42
  43 // --------
  44 // Listener
  45 // --------
  46
  47 DragonnetListener *dragonnet_listener_new(char *addr,
  48                 void (*on_connect)(DragonnetPeer *p))
  49 {
  50         DragonnetListener *l = malloc(sizeof *l);
  51         pthread_rwlock_init(&l->mu, NULL);
  52         pthread_rwlock_wrlock(&l->mu);
  53
  54         l->sock = socket(AF_INET6, SOCK_STREAM, 0);
  55         l->on_connect = on_connect;
  56         l->on_recv_type = calloc(sizeof *l->on_recv_type, dragonnet_num_types);
  57
  58         int so_reuseaddr = 1;
  59         if (setsockopt(l->sock, SOL_SOCKET, SO_REUSEADDR, &so_reuseaddr,
  60                         sizeof so_reuseaddr) < 0) {
  61                 perror("setsockopt");
  62                 dragonnet_listener_delete(l);
  63                 return NULL;
  64         }
  65
  66         l->laddr = dragonnet_addr_parse_str(addr);
  67         struct sockaddr_in6 ai_addr = dragonnet_addr_sock(l->laddr);
  68
  69         if (bind(l->sock, (const struct sockaddr *) &ai_addr, sizeof ai_addr) < 0) {
  70                 perror("bind");
  71                 dragonnet_listener_delete(l);
  72                 return NULL;
  73         }
  74
  75         if (listen(l->sock, 10) < 0) {
  76                 perror("listen");
  77                 dragonnet_listener_delete(l);
  78                 return NULL;
  79         }
  80
  81         pthread_rwlock_unlock(&l->mu);
  82         return l;
  83 }
  84
  85 void dragonnet_listener_set_recv_hook(DragonnetListener *l, u16 type_id,
  86                 void (*on_recv)(struct dragonnet_peer *, void *))
  87 {
  88         pthread_rwlock_rdlock(&l->mu);
  89         DragonnetListenerState state = l->state;
  90         pthread_rwlock_unlock(&l->mu);
  91
  92         if (state >= DRAGONNET_LISTENER_ACTIVE)
  93                 return;
  94
  95         pthread_rwlock_wrlock(&l->mu);
  96         l->on_recv_type[type_id] = on_recv;
  97         pthread_rwlock_unlock(&l->mu);
  98 }
  99
 100 static void *listener_main(void *g_listener)
 101 {
 102         DragonnetListener *l = (DragonnetListener *) g_listener;
 103
 104         pthread_rwlock_wrlock(&l->mu);
 105         assert(l->state == DRAGONNET_LISTENER_CREATED);
 106         l->state++;
 107         pthread_rwlock_unlock(&l->mu);
 108
 109         while (l->state == DRAGONNET_LISTENER_ACTIVE) {
 110                 struct sockaddr_in6 clt_addr;
 111                 socklen_t clt_addrlen = sizeof clt_addr;
 112
 113                 pthread_rwlock_rdlock(&l->mu);
 114                 int sock = l->sock;
 115                 pthread_rwlock_unlock(&l->mu);
 116
 117                 int clt_sock = accept(sock, (struct sockaddr *) &clt_addr, &clt_addrlen);
 118                 if (clt_sock < 0) {
 119                         perror("accept");
 120                         continue;
 121                 }
 122
 123                 DragonnetPeer *p = dragonnet_peer_accept(clt_sock, clt_addr, l);
 124                 if (p == NULL)
 125                         continue;
 126
 127                 dragonnet_peer_run(p);
 128
 129                 pthread_rwlock_rdlock(&l->mu);
 130                 void (*on_connect)(DragonnetPeer *) = l->on_connect;
 131                 pthread_rwlock_unlock(&l->mu);
 132
 133                 if (on_connect != NULL)
 134                         on_connect(p);
 135         }
 136
 137         return NULL;
 138 }
 139
 140 void dragonnet_listener_run(DragonnetListener *l)
 141 {
 142         pthread_create(&l->accept_thread, NULL, &listener_main, l);
 143 }
 144
 145 void dragonnet_listener_close(DragonnetListener *l)
 146 {
 147         pthread_rwlock_wrlock(&l->mu);
 148
 149         pthread_t accept_thread = l->accept_thread;
 150         assert(l->state == DRAGONNET_LISTENER_ACTIVE);
 151         close(l->sock);
 152         l->sock = -1;
 153         l->state++;
 154
 155         pthread_rwlock_unlock(&l->mu);
 156
 157         pthread_cancel(accept_thread);
 158         pthread_join(accept_thread, NULL);
 159 }
 160
 161 void dragonnet_listener_delete(DragonnetListener *l)
 162 {
 163         pthread_rwlock_destroy(&l->mu);
 164         free(l);
 165 }