udp_listen(Slirp *slirp, u_int32_t haddr, u_int hport, u_int32_t laddr, u_int lport, int flags) { struct sockaddr_in addr; struct socket *so; socklen_t addrlen = sizeof(struct sockaddr_in), opt = 1; so = socreate(slirp); if (!so) { return NULL; } so->s = socket(AF_INET,SOCK_DGRAM,0); so->so_expire = curtime + SO_EXPIRE; insque(so, &slirp->udb); addr.sin_family = AF_INET; addr.sin_addr.s_addr = haddr; addr.sin_port = hport; if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) { udp_detach(so); return NULL; } setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)); getsockname(so->s,(struct sockaddr *)&addr,&addrlen); so->so_fport = addr.sin_port; if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr) { so->so_faddr = slirp->vhost_addr; } else { so->so_faddr = addr.sin_addr; } so->so_lport = lport; so->so_laddr.s_addr = laddr; if (flags != SS_FACCEPTONCE) so->so_expire = 0; so->so_state &= SS_PERSISTENT_MASK; so->so_state |= SS_ISFCONNECTED | flags; return so; }