/*
*/
/*
- * tuntap-socket create-ptp <local-addr> <peer-addr> <mtu> [<ifname>]
- * => <sockid>
- * tuntap-socket close <sockid>
- * tuntap-socket ifname <sockid>
- * tuntap-socket receive <sockid> <data>
- * tuntap-socket on-transmit <sockid> [<script>]
+ * tuntap-socket-raw create [<ifname>] => <sockid>
+ * tuntap-socket-raw ifname <sockid> => <ifname>
+ * tuntap-socket-raw close <sockid>
+ * tuntap-socket-raw receive <sockid> <data>
+ * tuntap-socket-raw on-transmit <sockid> <mtu> [<script>]
* calls, effectively, eval <script> [list <data> <socket>]
* if script not supplied, cancel
*/
#include "tables.h"
#include "hbytes.h"
+#include <sys/ioctl.h>
+#include <linux/if.h>
+#include <linux/if_tun.h>
+
typedef struct TunSocket {
int ix, fd, script_llength;
Tcl_Interp *ip;
- Tcl_Obj *script;
- void msg_buf;
+ ScriptToInvoke script;
int mtu;
+ unsigned char *msg_buf;
char *ifname;
} TuntapSocket;
-IdDataTable tuntap_socks= { "tuntap" };
-
-static int sockfail(Tcl_Interp *ip, int fd, const char *m) {
- int e;
- e= errno;
- close(fd);
- return posixerr(ip,e,m);
-}
-
-int do_tuntap_socket_create_ptp(ClientData cd, Tcl_Interp *ip,
- SockAddr_Value local, SockAddr_Value peer,
- long mtu, const char *ifname,
- void **sock_r) {
- int fd, local_al, peer_al, r;
+int do_tuntap_socket_raw_create(ClientData cd, Tcl_Interp *ip,
+ const char *ifname, void **sock_r) {
+ int fd, r;
struct ifreq ifr;
- DgramSocket *sock;
- const struct sockaddr *local_sa, *peer_sa;
-
- local_sa= sockaddr_addr(&local);
- local_al= sockaddr_len(&local);
-
- peer_sa= sockaddr_addr(&peer);
- peer_al= sockaddr_len(&peer);
-
- if (local_sa != AF_INET || local_al != sizeof(struct in_addr) ||
- peer_sa != AF_INET || peer_al != sizeof(struct in_addr))
- return staticerr(ip,"tuntap not IPv4");
+ TuntapSocket *sock;
memset(&ifr,0,sizeof(ifr));
ifr.ifr_flags= IFF_TUN | IFF_NO_PI;
if (ifname) {
- if (strlen(ifname) > IFNAMSIZ-1)
- return staticerr(ip,"tun interface name too long");
+ if (strlen(ifname) > IFNAMSIZ-1) return
+ staticerr(ip,"tun interface name too long","TUNTAP IFNAME LENGTH");
strcpy(ifr.ifr_name, ifname);
}
fd= open("/dev/net/tun", O_RDWR);
if (fd<0) return posixerr(ip,errno,"open /dev/net/tun");
- r= ioctl(fd, TUNSETIFF, (void*)&ifr);
- if (r) return posixerr(ip,errno,"ioctl TUNSETIFF");
-
+ r= setnonblock(fd,1);
+ if (r) return posixerr(ip,errno,"setnonblock tun");
+ r= ioctl(fd, TUNSETIFF, (void*)&ifr);
+ if (r) return newfdposixerr(ip,fd,"ioctl TUNSETIFF");
- r=
- r= bind(fd, sa, al); if (r) return sockfail(ip,fd,"bind");
- r= setnonblock(fd, 1); if (r) return sockfail(ip,fd,"setnonblock");
-
- sock= TALLOC(sizeof(DgramSocket));
+ sock= TALLOC(sizeof(TuntapSocket));
sock->ix= -1;
sock->fd= fd;
- sock->script= 0;
- sock->addr_buflen= al+1;
- sock->addr_buf= TALLOC(sock->addr_buflen);
- sock->msg_buflen= 0;
+ sock->mtu= 0;
sock->msg_buf= 0;
+ sock->ifname= TALLOC(strlen(ifr.ifr_name)+1);
+ strcpy(sock->ifname, ifr.ifr_name);
+ scriptinv_init(&sock->script);
*sock_r= sock;
return TCL_OK;
}
-int do_tuntap_socket_transmit(ClientData cd, Tcl_Interp *ip,
- TuntapSocket *sock, HBytes_Value data,
- SockAddr_Value remote) {
+int do_tuntap_socket_raw_receive(ClientData cd, Tcl_Interp *ip,
+ void *sock_v, HBytes_Value data) {
+ TuntapSocket *sock= sock_v;
int l, r;
- r= sendto(sock->fd,
- hbytes_data(&data), l=hbytes_len(&data),
- 0,
- sockaddr_addr(&remote), sockaddr_len(&remote));
- if (r==-1) return posixerr(ip,errno,"sendto");
- else if (r!=l) return staticerr(ip,"sendto gave wrong answer",0);
+ r= write(sock->fd,
+ hbytes_data(&data), l=hbytes_len(&data));
+ if (r==-1) return posixerr(ip,errno,"write tuntap");
+ else if (r!=l) return staticerr(ip,"write tuntap gave wrong answer",0);
+ return TCL_OK;
+}
+
+int do_tuntap_socket_raw_ifname(ClientData cd, Tcl_Interp *ip,
+ void *sock_v, const char **result) {
+ TuntapSocket *sock= sock_v;
+ *result= sock->ifname;
return TCL_OK;
}
static void cancel(TuntapSocket *sock) {
- if (sock->script) {
+ if (sock->script.obj) {
+ scriptinv_cancel(&sock->script);
Tcl_DeleteFileHandler(sock->fd);
- Tcl_DecrRefCount(sock->script);
- sock->script= 0;
+ TFREE(sock->msg_buf);
+ sock->msg_buf= 0;
}
}
-static void recv_call(ClientData sock_cd, int mask) {
+static void read_call(ClientData sock_cd, int mask) {
TuntapSocket *sock= (void*)sock_cd;
Tcl_Interp *ip= sock->ip;
- int sz, rc, i, peek;
+ int sz, rc;
HBytes_Value message_val;
- SockAddr_Value peer_val;
- Tcl_Obj *args[3], *invoke;
- struct msghdr mh;
- struct iovec iov;
-
- hbytes_empty(&message_val);
- sockaddr_clear(&peer_val);
- invoke=0; for (i=0; i<3; i++) args[i]=0;
-
- mh.msg_iov= &iov;
- mh.msg_iovlen= 1;
- mh.msg_control= 0;
- mh.msg_controllen= 0;
- mh.msg_flags= 0;
+ Tcl_Obj *args[2];
- peek= MSG_PEEK;
-
for (;;) {
- mh.msg_name= sock->addr_buf;
- mh.msg_namelen= sock->addr_buflen;
-
- iov.iov_base= sock->msg_buf;
- iov.iov_len= sock->msg_buflen;
-
- sz= recvmsg(sock->fd, &mh, peek);
- if (sz==-1) { rc=0; goto x_rc; }
-
- assert(mh.msg_namelen < sock->addr_buflen);
-
- if (!(mh.msg_flags & MSG_TRUNC)) {
- if (!peek) break;
- peek= 0;
- continue;
+ sz= read(sock->fd, sock->msg_buf, sock->mtu);
+ if (sz == -1) {
+ if (errno == EAGAIN || errno == EWOULDBLOCK) rc=0;
+ else rc= posixerr(ip,errno,"read tuntap");
+ goto x_rc;
}
- TFREE(sock->msg_buf);
- sock->msg_buflen *= 2;
- sock->msg_buflen += 100;
- sock->msg_buf= TALLOC(sock->msg_buflen);
- }
-
- hbytes_array(&message_val, iov.iov_base, sz);
- sockaddr_create(&peer_val, mh.msg_name, mh.msg_namelen);
-
- args[0]= ret_hb(ip, message_val); hbytes_empty(&message_val);
- args[1]= ret_sockaddr(ip, peer_val); sockaddr_clear(&peer_val);
- args[2]= ret_sockid(ip, sock);
- for (i=0; i<3; i++) Tcl_IncrRefCount(args[i]);
-
- invoke= Tcl_DuplicateObj(sock->script);
- Tcl_IncrRefCount(invoke);
+ assert(sz <= sock->mtu);
- rc= Tcl_ListObjReplace(ip,invoke,sock->script_llength,0,3,args);
- for (i=0; i<3; i++) { Tcl_DecrRefCount(args[i]); args[i]= 0; }
- if (rc) goto x_rc;
-
- rc= Tcl_EvalObjEx(ip,invoke,TCL_EVAL_GLOBAL|TCL_EVAL_DIRECT);
+ hbytes_array(&message_val, sock->msg_buf, sz);
+ args[0]= ret_hb(ip, message_val); hbytes_empty(&message_val);
+ args[1]= ret_iddata(ip, sock, &tuntap_socks);
+ scriptinv_invoke(&sock->script, 2, args);
+ }
x_rc:
- if (invoke) Tcl_DecrRefCount(invoke);
-
- if (rc)
- Tcl_BackgroundError(ip);
+ if (rc) Tcl_BackgroundError(ip);
}
-int do_tuntap_socket_on_receive(ClientData cd, Tcl_Interp *ip,
- TuntapSocket *sock, Tcl_Obj *script) {
+int do_tuntap_socket_raw_on_transmit(ClientData cd, Tcl_Interp *ip,
+ void *sock_v,
+ long mtu, Tcl_Obj *newscript) {
+ TuntapSocket *sock= sock_v;
int rc;
+
+ if (mtu > 65536)
+ return staticerr(ip,"tuntap mtu >2^16","TUNTAP MTU OVERRUN");
+
+ cancel(sock);
- if (script) {
- rc= Tcl_ListObjLength(ip, script, &sock->script_llength);
+ if (newscript) {
+ rc= scriptinv_set(&sock->script,ip,newscript,0);
if (rc) return rc;
+
+ sock->mtu= mtu;
+ sock->msg_buf= TALLOC(mtu);
+ Tcl_CreateFileHandler(sock->fd, TCL_READABLE, read_call, sock);
}
-
- cancel(sock);
- if (script) {
- Tcl_IncrRefCount(script);
- sock->script= script;
- sock->ip= ip;
- }
- Tcl_CreateFileHandler(sock->fd, TCL_READABLE, recv_call, sock);
return TCL_OK;
}
-int do_tuntap_socket_close(ClientData cd, Tcl_Interp *ip, TuntapSocket *sock) {
- int sockix;
+static void destroy(void *sock_v) {
+ TuntapSocket *sock= sock_v;
cancel(sock);
close(sock->fd); /* nothing useful to be done with errors */
- sockix= sock->ix;
- TFREE(sock->addr_buf);
TFREE(sock->msg_buf);
TFREE(sock);
- socks[sockix]= 0;
- return TCL_OK;
-}
-
-/* Arg parsing */
-
-int pat_sockid(Tcl_Interp *ip, Tcl_Obj *o, TuntapSocket **val) {
- int rc, sockix;
- TuntapSocket *sock;
-
- rc= Tcl_ConvertToType(ip,o,&tuntapsockid_type);
- if (rc) return rc;
-
- sockix= o->internalRep.longValue;
- if (sockix >= n_socks || !(sock= socks[sockix]))
- return staticerr(ip,"tuntap socket not open",0);
-
- assert(socks[sockix]->ix == sockix);
-
- *val= sock;
- return TCL_OK;
-}
-
-Tcl_Obj *ret_sockid(Tcl_Interp *ip, TuntapSocket *val) {
- Tcl_Obj *o;
-
- o= Tcl_NewObj();
- Tcl_InvalidateStringRep(o);
- o->internalRep.longValue= val->ix;
- o->typePtr= &tuntapsockid_type;
- return o;
}
-static void sockid_t_free(Tcl_Obj *o) { }
-
-static void sockid_t_dup(Tcl_Obj *src, Tcl_Obj *dup) {
- dup->internalRep= src->internalRep;
- dup->typePtr= &tuntapsockid_type;
+static void destroy_idtabcb(Tcl_Interp *ip, void *sock_v) {
+ destroy(sock_v);
}
-static void sockid_t_ustr(Tcl_Obj *o) {
- char buf[75];
-
- snprintf(buf,sizeof(buf), "%d", (int)o->internalRep.longValue);
- obj_updatestr_vstringls(o,
- "tuntapsock",9,
- buf, strlen(buf),
- (char*)0);
-}
-
-static int sockid_t_sfa(Tcl_Interp *ip, Tcl_Obj *o) {
- unsigned long ul;
- char *ep, *str;
-
- str= Tcl_GetStringFromObj(o,0);
- if (memcmp(str,"tuntapsock",9)) return staticerr(ip,"bad tuntap socket id",0);
- errno=0; ul=strtoul(str+9,&ep,10);
- if (errno || *ep) return staticerr(ip,"bad tuntap socket id number",0);
- if (ul > INT_MAX) return staticerr(ip,"out of range tuntap socket id",0);
-
- objfreeir(o);
- o->internalRep.longValue= ul;
- o->typePtr= &tuntapsockid_type;
+int do_tuntap_socket_raw_close(ClientData cd, Tcl_Interp *ip, void *sock) {
+ destroy(sock);
+ tabledataid_disposing(ip,sock,&tuntap_socks);
return TCL_OK;
}
-Tcl_ObjType tuntapsockid_type = {
- "tuntapsockid",
- sockid_t_free, sockid_t_dup, sockid_t_ustr, sockid_t_sfa
+const IdDataSpec tuntap_socks= {
+ "tuntap", "tuntap-table", destroy_idtabcb
};
~ian / chiark-tcl.git / blobdiff