4 * tuntap-socket-rawlinux create [<ifname>] => <sockid>
5 * tuntap-socket-rawlinux ifname <sockid> => <ifname>
6 * tuntap-socket-rawlinux close <sockid>
7 * tuntap-socket-rawlinux receive <sockid> <data>
8 * tuntap-socket-rawlinux on-transmit <sockid> <mtu> [<script>]
9 * calls, effectively, eval <script> [list <data> <socket>]
10 * if script not supplied, cancel
17 #include <sys/ioctl.h>
19 #include <linux/if_tun.h>
21 typedef struct TunSocket {
22 int ix, fd, script_llength;
24 ScriptToInvoke script;
26 unsigned char *msg_buf;
30 IdDataTable tuntap_socks= { "tuntap" };
32 int do_tuntap_socket_create(ClientData cd, Tcl_Interp *ip,
33 const char *ifname, void **sock_r) {
38 memset(&ifr,0,sizeof(ifr));
39 ifr.ifr_flags= IFF_TUN | IFF_NO_PI;
42 if (strlen(ifname) > IFNAMSIZ-1) return
43 staticerr(ip,"tun interface name too long","TUNTAP IFNAME LENGTH");
44 strcpy(ifr.ifr_name, ifname);
47 fd= open("/dev/net/tun", O_RDWR);
48 if (fd<0) return posixerr(ip,errno,"open /dev/net/tun");
51 if (r) return posixerr(ip,errno,"setnonblock tun");
53 r= ioctl(fd, TUNSETIFF, (void*)&ifr);
54 if (r) return newfdposixerr(ip,fd,"ioctl TUNSETIFF");
56 sock= TALLOC(sizeof(TuntapSocket));
61 sock->ifname= TALLOC(strlen(ifr.ifr_name)+1);
62 strcpy(sock->ifname, ifr.ifr_name);
63 scriptinv_init(&sock->script);
69 int do_tuntap_socket_receive(ClientData cd, Tcl_Interp *ip,
70 void *sock_v, HBytes_Value data) {
71 TuntapSocket *sock= sock_v;
75 hbytes_data(&data), l=hbytes_len(&data));
76 if (r==-1) return posixerr(ip,errno,"write tuntap");
77 else if (r!=l) return staticerr(ip,"write tuntap gave wrong answer",0);
81 int do_tuntap_socket_ifname(ClientData cd, Tcl_Interp *ip,
82 void *sock_v, const char **result) {
83 TuntapSocket *sock= sock_v;
84 *result= sock->ifname;
88 static void cancel(TuntapSocket *sock) {
89 if (sock->script.obj) {
90 scriptinv_cancel(&sock->script);
91 Tcl_DeleteFileHandler(sock->fd);
97 static void read_call(ClientData sock_cd, int mask) {
98 TuntapSocket *sock= (void*)sock_cd;
99 Tcl_Interp *ip= sock->ip;
101 HBytes_Value message_val;
105 sz= read(sock->fd, sock->msg_buf, sock->mtu);
107 if (errno == EAGAIN || errno == EWOULDBLOCK) rc=0;
108 else rc= posixerr(ip,errno,"read tuntap");
112 assert(sz <= sock->mtu);
114 hbytes_array(&message_val, sock->msg_buf, sz);
115 args[0]= ret_hb(ip, message_val); hbytes_empty(&message_val);
116 args[1]= ret_iddata(ip, sock, &tuntap_socks);
117 scriptinv_invoke(&sock->script, 2, args);
121 if (rc) Tcl_BackgroundError(ip);
124 int do_tuntap_socket_on_transmit(ClientData cd, Tcl_Interp *ip, void *sock_v,
125 long mtu, Tcl_Obj *newscript) {
126 TuntapSocket *sock= sock_v;
130 return staticerr(ip,"tuntap mtu >2^16","TUNTAP MTU OVERRUN");
135 rc= scriptinv_set(&sock->script,ip,newscript);
139 sock->msg_buf= TALLOC(mtu);
140 Tcl_CreateFileHandler(sock->fd, TCL_READABLE, read_call, sock);
145 int do_tuntap_socket_close(ClientData cd, Tcl_Interp *ip, void *sock_v) {
146 TuntapSocket *sock= sock_v;
150 close(sock->fd); /* nothing useful to be done with errors */
152 TFREE(sock->msg_buf);
154 tuntap_socks.a[sockix]= 0;