X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=chiark-tcl.git;a=blobdiff_plain;f=tuntap%2Ftuntap.c;h=60a8cdcdeae0f8261da14e0e509063cd0d8101ff;hp=a4d9f9a0117c2a943b7f6f0ebccb4e649b01ef98;hb=123f9c3fe299d65938e12f55ab08773af2bf2484;hpb=b6017ccf067a7fefa893c8bf19288a1909f17263

diff --git a/tuntap/tuntap.c b/tuntap/tuntap.c
index a4d9f9a..60a8cdc 100644
--- a/tuntap/tuntap.c
+++ b/tuntap/tuntap.c
@@ -1,12 +1,11 @@
 /*
  */
 /*
- * 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
  */
@@ -14,263 +13,151 @@
 #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) {
+  tabledataid_disposing(ip,sock,&tuntap_socks);
+  destroy(sock);
   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
 };