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