Remove the requirement that redistributions in binary form reproduce

[ppp.git] / pppd / demand.c

diff --git a/pppd/demand.c b/pppd/demand.c
index f35c5319c638fad719e7d9cb6488efe8246b6e55..8bf96d02b7ff700b3ac0294c1e0ff0c4b22d7000 100644 (file)
--- a/pppd/demand.c
+++ b/pppd/demand.c
@@ -1,32 +1,40 @@
 /*
  * demand.c - Support routines for demand-dialling.
  *
- * Copyright (c) 1993 The Australian National University.
- * All rights reserved.
+ * Copyright (c) 1996-2002 Paul Mackerras. All rights reserved.
  *
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by the Australian National University.  The name of the University
- * may not be used to endorse or promote products derived from this
- * software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. The name(s) of the authors of this software must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission.
+ *
+ * 3. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by Paul Mackerras
+ *     <paulus@samba.org>".
+ *
+ * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#ifndef lint
-static char rcsid[] = "$Id: demand.c,v 1.4 1996/07/01 01:12:52 paulus Exp $";
-#endif
+#define RCSID  "$Id: demand.c,v 1.19 2004/11/04 10:02:26 paulus Exp $"
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <syslog.h>
 #include <netdb.h>
 #include <sys/param.h>
 #include <sys/types.h>
@@ -35,13 +43,17 @@ static char rcsid[] = "$Id: demand.c,v 1.4 1996/07/01 01:12:52 paulus Exp $";
 #include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
-#include <net/if.h>
+#ifdef PPP_FILTER
+#include <pcap-bpf.h>
+#endif
 
 #include "pppd.h"
 #include "fsm.h"
 #include "ipcp.h"
 #include "lcp.h"
 
+static const char rcsid[] = RCSID;
+
 char *frame;
 int framelen;
 int framemax;
@@ -82,10 +94,12 @@ demand_conf()
     flush_flag = 0;
     fcs = PPP_INITFCS;
 
-    ppp_send_config(0, PPP_MRU, (u_int32_t) 0, 0, 0);
-    ppp_recv_config(0, PPP_MRU, (u_int32_t) 0, 0, 0);
+    netif_set_mtu(0, MIN(lcp_allowoptions[0].mru, PPP_MRU));
+    if (ppp_send_config(0, PPP_MRU, (u_int32_t) 0, 0, 0) < 0
+       || ppp_recv_config(0, PPP_MRU, (u_int32_t) 0, 0, 0) < 0)
+           fatal("Couldn't set up demand-dialled PPP interface: %m");
 
-#if 0
+#ifdef PPP_FILTER
     set_filters(&pass_filter, &active_filter);
 #endif
 
@@ -213,7 +227,7 @@ loop_chars(p, n)
            if (!escape_flag && !flush_flag
                && framelen > 2 && fcs == PPP_GOODFCS) {
                framelen -= 2;
-               if (loop_frame(frame, framelen))
+               if (loop_frame((unsigned char *)frame, framelen))
                    rv = 1;
            }
            framelen = 0;
@@ -246,6 +260,10 @@ loop_chars(p, n)
  * decide whether to bring up the link or not, and, if we want
  * to transmit this frame later, put it on the pending queue.
  * Return value is 1 if we need to bring up the link, 0 otherwise.
+ * We assume that the kernel driver has already applied the
+ * pass_filter, so we won't get packets it rejected.
+ * We apply the active_filter to see if we want this packet to
+ * bring up the link.
  */
 int
 loop_frame(frame, len)
@@ -254,6 +272,7 @@ loop_frame(frame, len)
 {
     struct packet *pkt;
 
+    /* dbglog("from loop: %P", frame, len); */
     if (len < PPP_HDRLEN)
        return 0;
     if ((PPP_PROTOCOL(frame) & 0x8000) != 0)
@@ -321,6 +340,14 @@ active_packet(p, len)
     if (len < PPP_HDRLEN)
        return 0;
     proto = PPP_PROTOCOL(p);
+#ifdef PPP_FILTER
+    if (pass_filter.bf_len != 0
+       && bpf_filter(pass_filter.bf_insns, p, len, len) == 0)
+       return 0;
+    if (active_filter.bf_len != 0
+       && bpf_filter(active_filter.bf_insns, p, len, len) == 0)
+       return 0;
+#endif
     for (i = 0; (protp = protocols[i]) != NULL; ++i) {
        if (protp->protocol < 0xC000 && (protp->protocol & ~0x8000) == proto) {
            if (!protp->enabled_flag)