--- /dev/null
+diff -Naur ppp-2.4.4.orig/pppd/ipcp.c ppp-2.4.4/pppd/ipcp.c
+--- ppp-2.4.4.orig/pppd/ipcp.c 2009-05-09 02:55:46.000000000 -0400
++++ ppp-2.4.4/pppd/ipcp.c 2009-05-09 02:58:31.000000000 -0400
+@@ -197,6 +197,14 @@
+ "disable defaultroute option", OPT_ALIAS | OPT_A2CLR,
+ &ipcp_wantoptions[0].default_route },
+
++ { "replacedefaultroute", o_bool,
++ &ipcp_wantoptions[0].replace_default_route,
++ "Replace default route", 1
++ },
++ { "noreplacedefaultroute", o_bool,
++ &ipcp_allowoptions[0].replace_default_route,
++ "Never replace default route", OPT_A2COPY,
++ &ipcp_wantoptions[0].replace_default_route },
+ { "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp,
+ "Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp },
+ { "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
+@@ -263,7 +271,7 @@
+ ip_active_pkt
+ };
+
+-static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t));
++static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t, bool));
+ static void ipcp_script __P((char *, int)); /* Run an up/down script */
+ static void ipcp_script_done __P((void *));
+
+@@ -1660,7 +1668,8 @@
+ if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
+ return 0;
+ if (wo->default_route)
+- if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
++ if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr,
++ wo->replace_default_route))
+ default_route_set[u] = 1;
+ if (wo->proxy_arp)
+ if (sifproxyarp(u, wo->hisaddr))
+@@ -1742,7 +1751,8 @@
+ */
+ if (demand) {
+ if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
+- ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr);
++ ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr,
++ wo->replace_default_route);
+ if (go->ouraddr != wo->ouraddr) {
+ warn("Local IP address changed to %I", go->ouraddr);
+ script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0);
+@@ -1767,7 +1777,8 @@
+
+ /* assign a default route through the interface if required */
+ if (ipcp_wantoptions[f->unit].default_route)
+- if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
++ if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr,
++ wo->replace_default_route))
+ default_route_set[f->unit] = 1;
+
+ /* Make a proxy ARP entry if requested. */
+@@ -1817,7 +1828,8 @@
+
+ /* assign a default route through the interface if required */
+ if (ipcp_wantoptions[f->unit].default_route)
+- if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
++ if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr,
++ wo->replace_default_route))
+ default_route_set[f->unit] = 1;
+
+ /* Make a proxy ARP entry if requested. */
+@@ -1894,7 +1906,7 @@
+ sifnpmode(f->unit, PPP_IP, NPMODE_DROP);
+ sifdown(f->unit);
+ ipcp_clear_addrs(f->unit, ipcp_gotoptions[f->unit].ouraddr,
+- ipcp_hisoptions[f->unit].hisaddr);
++ ipcp_hisoptions[f->unit].hisaddr, 0);
+ }
+
+ /* Execute the ip-down script */
+@@ -1910,16 +1922,25 @@
+ * proxy arp entries, etc.
+ */
+ static void
+-ipcp_clear_addrs(unit, ouraddr, hisaddr)
++ipcp_clear_addrs(unit, ouraddr, hisaddr, replacedefaultroute)
+ int unit;
+ u_int32_t ouraddr; /* local address */
+ u_int32_t hisaddr; /* remote address */
++ bool replacedefaultroute;
+ {
+ if (proxy_arp_set[unit]) {
+ cifproxyarp(unit, hisaddr);
+ proxy_arp_set[unit] = 0;
+ }
+- if (default_route_set[unit]) {
++ /* If replacedefaultroute, sifdefaultroute will be called soon
++ * with replacedefaultroute set and that will overwrite the current
++ * default route. This is the case only when doing demand, otherwise
++ * during demand, this cifdefaultroute would restore the old default
++ * route which is not what we want in this case. In the non-demand
++ * case, we'll delete the default route and restore the old if there
++ * is one saved by an sifdefaultroute with replacedefaultroute.
++ */
++ if (!replacedefaultroute && default_route_set[unit]) {
+ cifdefaultroute(unit, ouraddr, hisaddr);
+ default_route_set[unit] = 0;
+ }
+diff -Naur ppp-2.4.4.orig/pppd/ipcp.h ppp-2.4.4/pppd/ipcp.h
+--- ppp-2.4.4.orig/pppd/ipcp.h 2009-05-09 02:54:59.000000000 -0400
++++ ppp-2.4.4/pppd/ipcp.h 2009-05-09 02:58:31.000000000 -0400
+@@ -70,6 +70,7 @@
+ bool old_addrs; /* Use old (IP-Addresses) option? */
+ bool req_addr; /* Ask peer to send IP address? */
+ bool default_route; /* Assign default route through interface? */
++ bool replace_default_route; /* Replace default route through interface? */
+ bool proxy_arp; /* Make proxy ARP entry for peer? */
+ bool neg_vj; /* Van Jacobson Compression? */
+ bool old_vj; /* use old (short) form of VJ option? */
+diff -Naur ppp-2.4.4.orig/pppd/pppd.8 ppp-2.4.4/pppd/pppd.8
+--- ppp-2.4.4.orig/pppd/pppd.8 2009-05-09 02:54:59.000000000 -0400
++++ ppp-2.4.4/pppd/pppd.8 2009-05-09 02:58:31.000000000 -0400
+@@ -121,6 +121,11 @@
+ This entry is removed when the PPP connection is broken. This option
+ is privileged if the \fInodefaultroute\fR option has been specified.
+ .TP
++.B replacedefaultroute
++This option is a flag to the defaultroute option. If defaultroute is
++set and this flag is also set, pppd replaces an existing default route
++with the new default route.
++.TP
+ .B disconnect \fIscript
+ Execute the command specified by \fIscript\fR, by passing it to a
+ shell, after
+@@ -706,7 +711,12 @@
+ .TP
+ .B nodefaultroute
+ Disable the \fIdefaultroute\fR option. The system administrator who
+-wishes to prevent users from creating default routes with pppd
++wishes to prevent users from adding a default route with pppd
++can do so by placing this option in the /etc/ppp/options file.
++.TP
++.B noreplacedefaultroute
++Disable the \fIreplacedefaultroute\fR option. The system administrator who
++wishes to prevent users from replacing a default route with pppd
+ can do so by placing this option in the /etc/ppp/options file.
+ .TP
+ .B nodeflate
+diff -Naur ppp-2.4.4.orig/pppd/pppd.h ppp-2.4.4/pppd/pppd.h
+--- ppp-2.4.4.orig/pppd/pppd.h 2009-05-09 02:55:46.000000000 -0400
++++ ppp-2.4.4/pppd/pppd.h 2009-05-09 02:58:31.000000000 -0400
+@@ -644,7 +644,7 @@
+ int cif6addr __P((int, eui64_t, eui64_t));
+ /* Remove an IPv6 address from i/f */
+ #endif
+-int sifdefaultroute __P((int, u_int32_t, u_int32_t));
++int sifdefaultroute __P((int, u_int32_t, u_int32_t, bool replace_default_rt));
+ /* Create default route through i/f */
+ int cifdefaultroute __P((int, u_int32_t, u_int32_t));
+ /* Delete default route through i/f */
+diff -Naur ppp-2.4.4.orig/pppd/sys-linux.c ppp-2.4.4/pppd/sys-linux.c
+--- ppp-2.4.4.orig/pppd/sys-linux.c 2009-05-09 02:55:46.000000000 -0400
++++ ppp-2.4.4/pppd/sys-linux.c 2009-05-09 02:58:31.000000000 -0400
+@@ -206,6 +206,8 @@
+
+ static int if_is_up; /* Interface has been marked up */
+ static int have_default_route; /* Gateway for default route added */
++static struct rtentry old_def_rt; /* Old default route */
++static int default_rt_repl_rest; /* replace and restore old default rt */
+ static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
+ static char proxy_arp_dev[16]; /* Device for proxy arp entry */
+ static u_int32_t our_old_addr; /* for detecting address changes */
+@@ -1520,6 +1522,9 @@
+ p = NULL;
+ }
+
++ SET_SA_FAMILY (rt->rt_dst, AF_INET);
++ SET_SA_FAMILY (rt->rt_gateway, AF_INET);
++
+ SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16);
+ SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16);
+ SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16);
+@@ -1589,20 +1594,51 @@
+ /********************************************************************
+ *
+ * sifdefaultroute - assign a default route through the address given.
+- */
+-
+-int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
+-{
+- struct rtentry rt;
+-
+- if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
+- if (rt.rt_flags & RTF_GATEWAY)
+- error("not replacing existing default route via %I",
+- SIN_ADDR(rt.rt_gateway));
+- else
++ *
++ * If the global default_rt_repl_rest flag is set, then this function
++ * already replaced the original system defaultroute with some other
++ * route and it should just replace the current defaultroute with
++ * another one, without saving the current route. Use: demand mode,
++ * when pppd sets first a defaultroute it it's temporary ppp0 addresses
++ * and then changes the temporary addresses to the addresses for the real
++ * ppp connection when it has come up.
++ */
++
++int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway, bool replace)
++{
++ struct rtentry rt, tmp_rt;
++ struct rtentry *del_rt = NULL;
++
++ if (default_rt_repl_rest) {
++ /* We have already reclaced the original defaultroute, if we
++ are called again, we will delete the current default route
++ and set the new default route in this function.
++ - this is normally only the case the doing demand: */
++ if (defaultroute_exists(&tmp_rt))
++ del_rt = &tmp_rt;
++ } else if (defaultroute_exists(&old_def_rt) &&
++ strcmp(old_def_rt.rt_dev, ifname) != 0) {
++ /* We did not yet replace an existing default route, let's
++ check if we should save and replace a default route: */
++ if (old_def_rt.rt_flags & RTF_GATEWAY) {
++ if (!replace) {
++ error("not replacing existing default route via %I",
++ SIN_ADDR(old_def_rt.rt_gateway));
++ return 0;
++ } else {
++ /* we need to copy rt_dev because we need it permanent too: */
++ char *tmp_dev = malloc(strlen(old_def_rt.rt_dev) + 1);
++ strcpy(tmp_dev, old_def_rt.rt_dev);
++ old_def_rt.rt_dev = tmp_dev;
++
++ notice("replacing old default route to %s [%I]",
++ old_def_rt.rt_dev, SIN_ADDR(old_def_rt.rt_gateway));
++ default_rt_repl_rest = 1;
++ del_rt = &old_def_rt;
++ }
++ } else
+ error("not replacing existing default route through %s",
+- rt.rt_dev);
+- return 0;
++ old_def_rt.rt_dev);
+ }
+
+ memset (&rt, 0, sizeof (rt));
+@@ -1617,10 +1653,16 @@
+
+ rt.rt_flags = RTF_UP;
+ if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
+- if ( ! ok_error ( errno ))
++ if (!ok_error(errno))
+ error("default route ioctl(SIOCADDRT): %m");
+ return 0;
+ }
++ if (default_rt_repl_rest && del_rt)
++ if (ioctl(sock_fd, SIOCDELRT, del_rt) < 0) {
++ if (!ok_error(errno))
++ error("del old default route ioctl(SIOCDELRT): %m");
++ return 0;
++ }
+
+ have_default_route = 1;
+ return 1;
+@@ -1649,11 +1691,21 @@
+ rt.rt_flags = RTF_UP;
+ if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
+ if (still_ppp()) {
+- if ( ! ok_error ( errno ))
++ if (!ok_error(errno))
+ error("default route ioctl(SIOCDELRT): %m");
+ return 0;
+ }
+ }
++ if (default_rt_repl_rest) {
++ notice("restoring old default route to %s [%I]",
++ old_def_rt.rt_dev, SIN_ADDR(old_def_rt.rt_gateway));
++ if (ioctl(sock_fd, SIOCADDRT, &old_def_rt) < 0) {
++ if (!ok_error(errno))
++ error("restore default route ioctl(SIOCADDRT): %m");
++ return 0;
++ }
++ default_rt_repl_rest = 0;
++ }
+
+ return 1;
+ }
+diff -Naur ppp-2.4.4.orig/pppd/sys-solaris.c ppp-2.4.4/pppd/sys-solaris.c
+--- ppp-2.4.4.orig/pppd/sys-solaris.c 2009-05-09 02:54:59.000000000 -0400
++++ ppp-2.4.4/pppd/sys-solaris.c 2009-05-09 02:58:31.000000000 -0400
+@@ -2036,12 +2036,18 @@
+ * sifdefaultroute - assign a default route through the address given.
+ */
+ int
+-sifdefaultroute(u, l, g)
++sifdefaultroute(u, l, g, replace)
+ int u;
+ u_int32_t l, g;
++ bool replace;
+ {
+ struct rtentry rt;
+
++ if (replace) {
++ error("replacedefaultroute not supported on this platform");
++ return 0;
++ }
++
+ #if defined(__USLC__)
+ g = l; /* use the local address as gateway */
+ #endif
+diff -Naur ppp-2.4.4.orig/pppd/ipcp.c ppp-2.4.4/pppd/ipcp.c
+--- ppp-2.4.4.orig/pppd/ipcp.c 2009-05-09 02:55:46.000000000 -0400
++++ ppp-2.4.4/pppd/ipcp.c 2009-05-09 02:58:31.000000000 -0400
+@@ -197,6 +197,14 @@
+ "disable defaultroute option", OPT_ALIAS | OPT_A2CLR,
+ &ipcp_wantoptions[0].default_route },
+
++ { "replacedefaultroute", o_bool,
++ &ipcp_wantoptions[0].replace_default_route,
++ "Replace default route", 1
++ },
++ { "noreplacedefaultroute", o_bool,
++ &ipcp_allowoptions[0].replace_default_route,
++ "Never replace default route", OPT_A2COPY,
++ &ipcp_wantoptions[0].replace_default_route },
+ { "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp,
+ "Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp },
+ { "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp,
+@@ -263,7 +271,7 @@
+ ip_active_pkt
+ };
+
+-static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t));
++static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t, bool));
+ static void ipcp_script __P((char *, int)); /* Run an up/down script */
+ static void ipcp_script_done __P((void *));
+
+@@ -1660,7 +1668,8 @@
+ if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
+ return 0;
+ if (wo->default_route)
+- if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
++ if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr,
++ wo->replace_default_route))
+ default_route_set[u] = 1;
+ if (wo->proxy_arp)
+ if (sifproxyarp(u, wo->hisaddr))
+@@ -1742,7 +1751,8 @@
+ */
+ if (demand) {
+ if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
+- ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr);
++ ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr,
++ wo->replace_default_route);
+ if (go->ouraddr != wo->ouraddr) {
+ warn("Local IP address changed to %I", go->ouraddr);
+ script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0);
+@@ -1767,7 +1777,8 @@
+
+ /* assign a default route through the interface if required */
+ if (ipcp_wantoptions[f->unit].default_route)
+- if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
++ if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr,
++ wo->replace_default_route))
+ default_route_set[f->unit] = 1;
+
+ /* Make a proxy ARP entry if requested. */
+@@ -1817,7 +1828,8 @@
+
+ /* assign a default route through the interface if required */
+ if (ipcp_wantoptions[f->unit].default_route)
+- if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
++ if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr,
++ wo->replace_default_route))
+ default_route_set[f->unit] = 1;
+
+ /* Make a proxy ARP entry if requested. */
+@@ -1894,7 +1906,7 @@
+ sifnpmode(f->unit, PPP_IP, NPMODE_DROP);
+ sifdown(f->unit);
+ ipcp_clear_addrs(f->unit, ipcp_gotoptions[f->unit].ouraddr,
+- ipcp_hisoptions[f->unit].hisaddr);
++ ipcp_hisoptions[f->unit].hisaddr, 0);
+ }
+
+ /* Execute the ip-down script */
+@@ -1910,16 +1922,25 @@
+ * proxy arp entries, etc.
+ */
+ static void
+-ipcp_clear_addrs(unit, ouraddr, hisaddr)
++ipcp_clear_addrs(unit, ouraddr, hisaddr, replacedefaultroute)
+ int unit;
+ u_int32_t ouraddr; /* local address */
+ u_int32_t hisaddr; /* remote address */
++ bool replacedefaultroute;
+ {
+ if (proxy_arp_set[unit]) {
+ cifproxyarp(unit, hisaddr);
+ proxy_arp_set[unit] = 0;
+ }
+- if (default_route_set[unit]) {
++ /* If replacedefaultroute, sifdefaultroute will be called soon
++ * with replacedefaultroute set and that will overwrite the current
++ * default route. This is the case only when doing demand, otherwise
++ * during demand, this cifdefaultroute would restore the old default
++ * route which is not what we want in this case. In the non-demand
++ * case, we'll delete the default route and restore the old if there
++ * is one saved by an sifdefaultroute with replacedefaultroute.
++ */
++ if (!replacedefaultroute && default_route_set[unit]) {
+ cifdefaultroute(unit, ouraddr, hisaddr);
+ default_route_set[unit] = 0;
+ }
+diff -Naur ppp-2.4.4.orig/pppd/ipcp.h ppp-2.4.4/pppd/ipcp.h
+--- ppp-2.4.4.orig/pppd/ipcp.h 2009-05-09 02:54:59.000000000 -0400
++++ ppp-2.4.4/pppd/ipcp.h 2009-05-09 02:58:31.000000000 -0400
+@@ -70,6 +70,7 @@
+ bool old_addrs; /* Use old (IP-Addresses) option? */
+ bool req_addr; /* Ask peer to send IP address? */
+ bool default_route; /* Assign default route through interface? */
++ bool replace_default_route; /* Replace default route through interface? */
+ bool proxy_arp; /* Make proxy ARP entry for peer? */
+ bool neg_vj; /* Van Jacobson Compression? */
+ bool old_vj; /* use old (short) form of VJ option? */
+diff -Naur ppp-2.4.4.orig/pppd/pppd.8 ppp-2.4.4/pppd/pppd.8
+--- ppp-2.4.4.orig/pppd/pppd.8 2009-05-09 02:54:59.000000000 -0400
++++ ppp-2.4.4/pppd/pppd.8 2009-05-09 02:58:31.000000000 -0400
+@@ -121,6 +121,11 @@
+ This entry is removed when the PPP connection is broken. This option
+ is privileged if the \fInodefaultroute\fR option has been specified.
+ .TP
++.B replacedefaultroute
++This option is a flag to the defaultroute option. If defaultroute is
++set and this flag is also set, pppd replaces an existing default route
++with the new default route.
++.TP
+ .B disconnect \fIscript
+ Execute the command specified by \fIscript\fR, by passing it to a
+ shell, after
+@@ -706,7 +711,12 @@
+ .TP
+ .B nodefaultroute
+ Disable the \fIdefaultroute\fR option. The system administrator who
+-wishes to prevent users from creating default routes with pppd
++wishes to prevent users from adding a default route with pppd
++can do so by placing this option in the /etc/ppp/options file.
++.TP
++.B noreplacedefaultroute
++Disable the \fIreplacedefaultroute\fR option. The system administrator who
++wishes to prevent users from replacing a default route with pppd
+ can do so by placing this option in the /etc/ppp/options file.
+ .TP
+ .B nodeflate
+diff -Naur ppp-2.4.4.orig/pppd/pppd.h ppp-2.4.4/pppd/pppd.h
+--- ppp-2.4.4.orig/pppd/pppd.h 2009-05-09 02:55:46.000000000 -0400
++++ ppp-2.4.4/pppd/pppd.h 2009-05-09 02:58:31.000000000 -0400
+@@ -644,7 +644,7 @@
+ int cif6addr __P((int, eui64_t, eui64_t));
+ /* Remove an IPv6 address from i/f */
+ #endif
+-int sifdefaultroute __P((int, u_int32_t, u_int32_t));
++int sifdefaultroute __P((int, u_int32_t, u_int32_t, bool replace_default_rt));
+ /* Create default route through i/f */
+ int cifdefaultroute __P((int, u_int32_t, u_int32_t));
+ /* Delete default route through i/f */
+diff -Naur ppp-2.4.4.orig/pppd/sys-linux.c ppp-2.4.4/pppd/sys-linux.c
+--- ppp-2.4.4.orig/pppd/sys-linux.c 2009-05-09 02:55:46.000000000 -0400
++++ ppp-2.4.4/pppd/sys-linux.c 2009-05-09 02:58:31.000000000 -0400
+@@ -206,6 +206,8 @@
+
+ static int if_is_up; /* Interface has been marked up */
+ static int have_default_route; /* Gateway for default route added */
++static struct rtentry old_def_rt; /* Old default route */
++static int default_rt_repl_rest; /* replace and restore old default rt */
+ static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
+ static char proxy_arp_dev[16]; /* Device for proxy arp entry */
+ static u_int32_t our_old_addr; /* for detecting address changes */
+@@ -1520,6 +1522,9 @@
+ p = NULL;
+ }
+
++ SET_SA_FAMILY (rt->rt_dst, AF_INET);
++ SET_SA_FAMILY (rt->rt_gateway, AF_INET);
++
+ SIN_ADDR(rt->rt_dst) = strtoul(cols[route_dest_col], NULL, 16);
+ SIN_ADDR(rt->rt_gateway) = strtoul(cols[route_gw_col], NULL, 16);
+ SIN_ADDR(rt->rt_genmask) = strtoul(cols[route_mask_col], NULL, 16);
+@@ -1589,20 +1594,51 @@
+ /********************************************************************
+ *
+ * sifdefaultroute - assign a default route through the address given.
+- */
+-
+-int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
+-{
+- struct rtentry rt;
+-
+- if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
+- if (rt.rt_flags & RTF_GATEWAY)
+- error("not replacing existing default route via %I",
+- SIN_ADDR(rt.rt_gateway));
+- else
++ *
++ * If the global default_rt_repl_rest flag is set, then this function
++ * already replaced the original system defaultroute with some other
++ * route and it should just replace the current defaultroute with
++ * another one, without saving the current route. Use: demand mode,
++ * when pppd sets first a defaultroute it it's temporary ppp0 addresses
++ * and then changes the temporary addresses to the addresses for the real
++ * ppp connection when it has come up.
++ */
++
++int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway, bool replace)
++{
++ struct rtentry rt, tmp_rt;
++ struct rtentry *del_rt = NULL;
++
++ if (default_rt_repl_rest) {
++ /* We have already reclaced the original defaultroute, if we
++ are called again, we will delete the current default route
++ and set the new default route in this function.
++ - this is normally only the case the doing demand: */
++ if (defaultroute_exists(&tmp_rt))
++ del_rt = &tmp_rt;
++ } else if (defaultroute_exists(&old_def_rt) &&
++ strcmp(old_def_rt.rt_dev, ifname) != 0) {
++ /* We did not yet replace an existing default route, let's
++ check if we should save and replace a default route: */
++ if (old_def_rt.rt_flags & RTF_GATEWAY) {
++ if (!replace) {
++ error("not replacing existing default route via %I",
++ SIN_ADDR(old_def_rt.rt_gateway));
++ return 0;
++ } else {
++ /* we need to copy rt_dev because we need it permanent too: */
++ char *tmp_dev = malloc(strlen(old_def_rt.rt_dev) + 1);
++ strcpy(tmp_dev, old_def_rt.rt_dev);
++ old_def_rt.rt_dev = tmp_dev;
++
++ notice("replacing old default route to %s [%I]",
++ old_def_rt.rt_dev, SIN_ADDR(old_def_rt.rt_gateway));
++ default_rt_repl_rest = 1;
++ del_rt = &old_def_rt;
++ }
++ } else
+ error("not replacing existing default route through %s",
+- rt.rt_dev);
+- return 0;
++ old_def_rt.rt_dev);
+ }
+
+ memset (&rt, 0, sizeof (rt));
+@@ -1617,10 +1653,16 @@
+
+ rt.rt_flags = RTF_UP;
+ if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
+- if ( ! ok_error ( errno ))
++ if (!ok_error(errno))
+ error("default route ioctl(SIOCADDRT): %m");
+ return 0;
+ }
++ if (default_rt_repl_rest && del_rt)
++ if (ioctl(sock_fd, SIOCDELRT, del_rt) < 0) {
++ if (!ok_error(errno))
++ error("del old default route ioctl(SIOCDELRT): %m");
++ return 0;
++ }
+
+ have_default_route = 1;
+ return 1;
+@@ -1649,11 +1691,21 @@
+ rt.rt_flags = RTF_UP;
+ if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
+ if (still_ppp()) {
+- if ( ! ok_error ( errno ))
++ if (!ok_error(errno))
+ error("default route ioctl(SIOCDELRT): %m");
+ return 0;
+ }
+ }
++ if (default_rt_repl_rest) {
++ notice("restoring old default route to %s [%I]",
++ old_def_rt.rt_dev, SIN_ADDR(old_def_rt.rt_gateway));
++ if (ioctl(sock_fd, SIOCADDRT, &old_def_rt) < 0) {
++ if (!ok_error(errno))
++ error("restore default route ioctl(SIOCADDRT): %m");
++ return 0;
++ }
++ default_rt_repl_rest = 0;
++ }
+
+ return 1;
+ }
+diff -Naur ppp-2.4.4.orig/pppd/sys-solaris.c ppp-2.4.4/pppd/sys-solaris.c
+--- ppp-2.4.4.orig/pppd/sys-solaris.c 2009-05-09 02:54:59.000000000 -0400
++++ ppp-2.4.4/pppd/sys-solaris.c 2009-05-09 02:58:31.000000000 -0400
+@@ -2036,12 +2036,18 @@
+ * sifdefaultroute - assign a default route through the address given.
+ */
+ int
+-sifdefaultroute(u, l, g)
++sifdefaultroute(u, l, g, replace)
+ int u;
+ u_int32_t l, g;
++ bool replace;
+ {
+ struct rtentry rt;
+
++ if (replace) {
++ error("replacedefaultroute not supported on this platform");
++ return 0;
++ }
++
+ #if defined(__USLC__)
+ g = l; /* use the local address as gateway */
+ #endif
projects / openwrt.git / blobdiff