4 * tuntap-socket-raw create [<ifname>] => <sockid>
5 * tuntap-socket-raw ifname <sockid> => <ifname>
6 * tuntap-socket-raw close <sockid>
7 * tuntap-socket-raw receive <sockid> <data>
8 * tuntap-socket-raw on-transmit <sockid> <mtu> [<script>]
9 * calls, effectively, eval <script> [list <data> <socket>]
10 * if script not supplied, cancel
16 #include <sys/ioctl.h>
18 #include <linux/if_tun.h>
20 typedef struct TunSocket {
21 int ix, fd, script_llength;
23 ScriptToInvoke script;
25 unsigned char *msg_buf;
29 IdDataTable tuntap_socks= { "tuntap" };
31 int do_tuntap_socket_raw_create(ClientData cd, Tcl_Interp *ip,
32 const char *ifname, void **sock_r) {
37 memset(&ifr,0,sizeof(ifr));
38 ifr.ifr_flags= IFF_TUN | IFF_NO_PI;
41 if (strlen(ifname) > IFNAMSIZ-1) return
42 staticerr(ip,"tun interface name too long","TUNTAP IFNAME LENGTH");
43 strcpy(ifr.ifr_name, ifname);
46 fd= open("/dev/net/tun", O_RDWR);
47 if (fd<0) return posixerr(ip,errno,"open /dev/net/tun");
50 if (r) return posixerr(ip,errno,"setnonblock tun");
52 r= ioctl(fd, TUNSETIFF, (void*)&ifr);
53 if (r) return newfdposixerr(ip,fd,"ioctl TUNSETIFF");
55 sock= TALLOC(sizeof(TuntapSocket));
60 sock->ifname= TALLOC(strlen(ifr.ifr_name)+1);
61 strcpy(sock->ifname, ifr.ifr_name);
62 scriptinv_init(&sock->script);
68 int do_tuntap_socket_raw_receive(ClientData cd, Tcl_Interp *ip,
69 void *sock_v, HBytes_Value data) {
70 TuntapSocket *sock= sock_v;
74 hbytes_data(&data), l=hbytes_len(&data));
75 if (r==-1) return posixerr(ip,errno,"write tuntap");
76 else if (r!=l) return staticerr(ip,"write tuntap gave wrong answer",0);
80 int do_tuntap_socket_raw_ifname(ClientData cd, Tcl_Interp *ip,
81 void *sock_v, const char **result) {
82 TuntapSocket *sock= sock_v;
83 *result= sock->ifname;
87 static void cancel(TuntapSocket *sock) {
88 if (sock->script.obj) {
89 scriptinv_cancel(&sock->script);
90 Tcl_DeleteFileHandler(sock->fd);
96 static void read_call(ClientData sock_cd, int mask) {
97 TuntapSocket *sock= (void*)sock_cd;
98 Tcl_Interp *ip= sock->ip;
100 HBytes_Value message_val;
104 sz= read(sock->fd, sock->msg_buf, sock->mtu);
106 if (errno == EAGAIN || errno == EWOULDBLOCK) rc=0;
107 else rc= posixerr(ip,errno,"read tuntap");
111 assert(sz <= sock->mtu);
113 hbytes_array(&message_val, sock->msg_buf, sz);
114 args[0]= ret_hb(ip, message_val); hbytes_empty(&message_val);
115 args[1]= ret_iddata(ip, sock, &tuntap_socks);
116 scriptinv_invoke(&sock->script, 2, args);
120 if (rc) Tcl_BackgroundError(ip);
123 int do_tuntap_socket_raw_on_transmit(ClientData cd, Tcl_Interp *ip,
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_raw_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;