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         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                 void (*on_recv_type)(struct dragonnet_peer *, u16))
  50 {
  51         DragonnetListener *l = malloc(sizeof *l);
  52         pthread_rwlock_init(&l->mu, NULL);
  53         pthread_rwlock_wrlock(&l->mu);
  54
  55         l->sock = socket(AF_INET6, SOCK_STREAM, 0);
  56         l->on_connect = on_connect;
  57         l->on_recv_type = on_recv_type;
  58
  59         int so_reuseaddr = 1;
  60         if (setsockopt(l->sock, SOL_SOCKET, SO_REUSEADDR, &so_reuseaddr,
  61                         sizeof so_reuseaddr) < 0) {
  62                 perror("setsockopt");
  63                 dragonnet_listener_delete(l);
  64                 return NULL;
  65         }
  66
  67         l->laddr = dragonnet_addr_parse_str(addr);
  68         struct sockaddr_in6 ai_addr = dragonnet_addr_sock(l->laddr);
  69
  70         if (bind(l->sock, (const struct sockaddr *) &ai_addr, sizeof ai_addr) < 0) {
  71                 perror("bind");
  72                 dragonnet_listener_delete(l);
  73                 return NULL;
  74         }
  75
  76         if (listen(l->sock, 10) < 0) {
  77                 perror("listen");
  78                 dragonnet_listener_delete(l);
  79                 return NULL;
  80         }
  81
  82         pthread_rwlock_unlock(&l->mu);
  83         return l;
  84 }
  85
  86 static void *listener_main(void *g_listener)
  87 {
  88         DragonnetListener *l = (DragonnetListener *) g_listener;
  89
  90         pthread_rwlock_wrlock(&l->mu);
  91         assert(l->state == DRAGONNET_LISTENER_CREATED);
  92         l->state++;
  93         pthread_rwlock_unlock(&l->mu);
  94
  95         while (l->state == DRAGONNET_LISTENER_ACTIVE) {
  96                 struct sockaddr_in6 clt_addr;
  97                 socklen_t clt_addrlen = sizeof clt_addr;
  98
  99                 pthread_rwlock_rdlock(&l->mu);
 100                 int sock = l->sock;
 101                 pthread_rwlock_unlock(&l->mu);
 102
 103                 int clt_sock = accept(sock, (struct sockaddr *) &clt_addr, &clt_addrlen);
 104                 if (clt_sock < 0) {
 105                         perror("accept");
 106                         continue;
 107                 }
 108
 109                 DragonnetPeer *p = dragonnet_peer_accept(clt_sock, clt_addr, l);
 110                 if (p == NULL)
 111                         continue;
 112
 113                 dragonnet_peer_run(p);
 114
 115                 pthread_rwlock_rdlock(&l->mu);
 116                 void (*on_connect)(DragonnetPeer *) = l->on_connect;
 117                 pthread_rwlock_unlock(&l->mu);
 118
 119                 if (on_connect != NULL)
 120                         on_connect(p);
 121         }
 122
 123         return NULL;
 124 }
 125
 126 void dragonnet_listener_run(DragonnetListener *l)
 127 {
 128         pthread_create(&l->accept_thread, NULL, &listener_main, l);
 129 }
 130
 131 void dragonnet_listener_close(DragonnetListener *l)
 132 {
 133         pthread_rwlock_wrlock(&l->mu);
 134
 135         pthread_t accept_thread = l->accept_thread;
 136         assert(l->state == DRAGONNET_LISTENER_ACTIVE);
 137         close(l->sock);
 138         l->sock = -1;
 139         l->state++;
 140
 141         pthread_rwlock_unlock(&l->mu);
 142
 143         pthread_cancel(accept_thread);
 144         pthread_join(accept_thread, NULL);
 145 }
 146
 147 void dragonnet_listener_delete(DragonnetListener *l)
 148 {
 149         pthread_rwlock_destroy(&l->mu);
 150         free(l);
 151 }