dragonnet/listen.c

   1 #define _GNU_SOURCE
   2 #include <assert.h>
   3 #include <errno.h>
   4 #include <signal.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include "addr.h"
   8 #include "listen.h"
   9 #include "recv.h"
  10 #include "sock.h"
  11
  12 // ----
  13 // Peer
  14 // ----
  15
  16 static bool dragonnet_peer_init_accepted(DragonnetPeer *p, int sock,
  17                 char *addr, DragonnetListener *l)
  18 {
  19         pthread_mutex_init(&p->mtx, NULL);
  20
  21         p->sock = sock;
  22         p->address = addr;
  23         p->on_disconnect = l->on_disconnect;
  24         p->on_recv = l->on_recv;
  25         p->on_recv_type = l->on_recv_type;
  26
  27         return true;
  28 }
  29
  30 static DragonnetPeer *dragonnet_peer_accept(int sock, char *addr,
  31                 DragonnetListener *l)
  32 {
  33         DragonnetPeer *p = malloc(sizeof *p);
  34         if (!dragonnet_peer_init_accepted(p, sock, addr, l)) {
  35                 pthread_mutex_destroy(&p->mtx);
  36                 free(p);
  37                 free(addr);
  38                 return NULL;
  39         }
  40
  41         return p;
  42 }
  43
  44 // --------
  45 // Listener
  46 // --------
  47
  48 DragonnetListener *dragonnet_listener_new(char *addr)
  49 {
  50         struct addrinfo *info = dragonnet_str2addr(addr);
  51         if (!info)
  52                 return NULL;
  53
  54         DragonnetListener *l = malloc(sizeof *l);
  55
  56         l->active = true;
  57         l->sock = socket(info->ai_family, info->ai_socktype, info->ai_protocol);
  58         l->address = dragonnet_addr2str(info->ai_addr, info->ai_addrlen);
  59         l->on_connect = NULL;
  60         l->on_disconnect = NULL;
  61         l->on_recv = NULL;
  62         l->on_recv_type = calloc(sizeof *l->on_recv_type, dragonnet_num_types);
  63
  64         int so_reuseaddr = 1;
  65         if (setsockopt(l->sock, SOL_SOCKET, SO_REUSEADDR, (void *) &so_reuseaddr,
  66                         sizeof so_reuseaddr) < 0) {
  67                 perror("setsockopt");
  68                 freeaddrinfo(info);
  69                 dragonnet_listener_delete(l);
  70                 return NULL;
  71         }
  72
  73         if (bind(l->sock, info->ai_addr, info->ai_addrlen) < 0) {
  74                 perror("bind");
  75                 freeaddrinfo(info);
  76                 dragonnet_listener_delete(l);
  77                 return NULL;
  78         }
  79
  80         freeaddrinfo(info);
  81
  82         if (listen(l->sock, 10) < 0) {
  83                 perror("listen");
  84                 dragonnet_listener_delete(l);
  85                 return NULL;
  86         }
  87
  88         return l;
  89 }
  90
  91 static void *listener_main(void *g_listener)
  92 {
  93 #ifdef __GLIBC__
  94         pthread_setname_np(pthread_self(), "listen");
  95 #endif
  96
  97         DragonnetListener *l = (DragonnetListener *) g_listener;
  98
  99         while (l->active) {
 100                 struct sockaddr_storage clt_addr;
 101                 socklen_t clt_addrlen = sizeof clt_addr;
 102
 103                 int clt_sock = accept(l->sock, (struct sockaddr *) &clt_addr, &clt_addrlen);
 104                 if (clt_sock < 0) {
 105                         if (errno != EINTR)
 106                                 perror("accept");
 107                         continue;
 108                 }
 109
 110                 char *clt_addstr =  dragonnet_addr2str((struct sockaddr *) &clt_addr, clt_addrlen);
 111                 DragonnetPeer *p = dragonnet_peer_accept(clt_sock, clt_addstr, l);
 112                 if (p == NULL)
 113                         continue;
 114
 115                 void (*on_connect)(DragonnetPeer *) = l->on_connect;
 116
 117                 if (on_connect != NULL)
 118                         on_connect(p);
 119
 120                 dragonnet_peer_run(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         l->active = false;
 134
 135         pthread_kill(l->accept_thread, SIGINT);
 136         pthread_join(l->accept_thread, NULL);
 137 }
 138
 139 void dragonnet_listener_delete(DragonnetListener *l)
 140 {
 141         free(l->on_recv_type);
 142         free(l->address);
 143         free(l);
 144 }