mirror of
https://github.com/kernelkit/infix.git
synced 2026-07-22 01:13:00 +02:00
netd: add vtysh -b backend
This is a simpler approach than both grpc and watchfrr. Since we only really need dynamic handling of static routes (for DHCP), we can track changes made and maintain a "diff engine" for the resulting frr.conf. Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
@@ -1,2 +1,2 @@
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#set DEBUG=1
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service [2345] <pid/confd> name:netd netd -- Network route daemon
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service [2345] <pid/confd,pid/staticd> name:netd netd -- Network route daemon
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+27
-8
@@ -6,28 +6,42 @@ config BR2_PACKAGE_NETD
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Network route daemon. Manages static routes and RIP routing.
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Reads configuration from /etc/netd/conf.d/*.conf.
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With FRR: Full routing via gRPC (static routes, RIP, OSPF).
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With FRR: Full routing via gRPC, vtysh, or frr.conf.
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Without FRR: Standalone Linux backend via rtnetlink.
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https://github.com/kernelkit/infix
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if BR2_PACKAGE_NETD
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choice
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prompt "FRR backend"
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default BR2_PACKAGE_NETD_FRR_VTYSH if BR2_PACKAGE_FRR
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default BR2_PACKAGE_NETD_LINUX
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config BR2_PACKAGE_NETD_FRR_VTYSH
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bool "FRR vtysh"
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depends on BR2_PACKAGE_FRR
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help
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Enable FRR integration via vtysh -b.
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netd generates incremental config diffs and applies
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them to running FRR daemons via vtysh -b.
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FRR daemons run as standalone finit services (no watchfrr).
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Provides static routes and RIP support.
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config BR2_PACKAGE_NETD_FRR_CONF
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bool "FRR frr.conf backend"
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default y if BR2_PACKAGE_FRR
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bool "FRR frr.conf"
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depends on BR2_PACKAGE_FRR
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help
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Enable FRR integration via frr.conf file generation.
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netd assembles a single /etc/frr/frr.conf from routing
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config and signals FRR to reload via frrinit.sh.
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config and signals FRR to reload via frrinit.sh/watchfrr.
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Provides full routing support (static routes, RIP, OSPF).
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config BR2_PACKAGE_NETD_FRR
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bool "FRR gRPC backend"
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bool "FRR gRPC"
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depends on BR2_PACKAGE_FRR
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depends on !BR2_PACKAGE_NETD_FRR_CONF
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select BR2_PACKAGE_PROTOBUF
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select BR2_PACKAGE_GRPC
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select BR2_PACKAGE_HOST_PROTOBUF
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@@ -36,7 +50,12 @@ config BR2_PACKAGE_NETD_FRR
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Enable FRR integration via gRPC northbound API.
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Provides full routing support (static routes, RIP, OSPF).
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If disabled, netd uses Linux kernel backend (rtnetlink)
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with static routes only.
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config BR2_PACKAGE_NETD_LINUX
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bool "Linux kernel"
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help
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Use Linux kernel backend (rtnetlink) with static routes
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only. No FRR dependency.
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endchoice
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endif
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@@ -21,6 +21,9 @@ NETD_CONF_OPTS = --prefix= --disable-silent-rules
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ifeq ($(BR2_PACKAGE_NETD_FRR_CONF),y)
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NETD_DEPENDENCIES += frr
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NETD_CONF_OPTS += --with-frr-conf
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else ifeq ($(BR2_PACKAGE_NETD_FRR_VTYSH),y)
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NETD_DEPENDENCIES += frr
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NETD_CONF_OPTS += --with-frr-vtysh
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else ifeq ($(BR2_PACKAGE_NETD_FRR),y)
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NETD_DEPENDENCIES += frr grpc host-grpc protobuf
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NETD_CONF_ENV += \
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@@ -1,2 +1,3 @@
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service <pid/zebra> env:-/etc/default/ripd \
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[2345] ripd $RIPD_ARGS -- RIP daemon
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[2345] ripd $RIPD_ARGS
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-- RIP daemon
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@@ -1,3 +1,3 @@
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service log:null <!pid/zebra> \
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service <!pid/zebra> log:null \
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[2345] staticd -A 127.0.0.1 -u frr -g frr \
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-- Static routing daemon
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@@ -1,2 +1,3 @@
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service <!pid/netd> pid:!/run/frr/zebra.pid env:-/etc/default/zebra \
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[2345] zebra $ZEBRA_ARGS -- Zebra routing daemon
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service <!pid/mgmtd> pid:!/run/frr/zebra.pid env:-/etc/default/zebra \
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[2345] zebra $ZEBRA_ARGS
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-- Zebra routing daemon
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@@ -539,7 +539,7 @@ int routing_change(sr_session_ctx_t *session, struct lyd_node *config, struct ly
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ripd_enabled = fexist(RIPD_SIGNAL_NEXT);
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activate:
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/* Generate complete /etc/frr/daemons */
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/* Generate complete /etc/frr/daemons (for watchfrr/frrinit.sh) */
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frr_daemons_write(ospfd_enabled, ripd_enabled, bfdd_enabled);
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if (bfdd_enabled)
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@@ -569,6 +569,14 @@ activate:
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(void)remove(NETD_CONF);
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}
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/* Enable/disable FRR daemons as standalone finit services.
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* Harmless no-op when using watchfrr (services not installed). */
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systemf("initctl -nbq %s ospfd", ospfd_enabled ? "enable" : "disable");
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if (ospfd_enabled)
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systemf("initctl -nbq touch ospfd");
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systemf("initctl -nbq %s ripd", ripd_enabled ? "enable" : "disable");
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systemf("initctl -nbq %s bfdd", bfdd_enabled ? "enable" : "disable");
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/*
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* Signal netd to reload - it assembles /etc/frr/frr.conf and
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* Finit propagates the restart to the frr sysv service
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@@ -33,7 +33,12 @@ if HAVE_FRR_CONF
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# FRR frr.conf file backend
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netd_SOURCES += src/frrconf_backend.c src/frrconf_backend.h
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else
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if HAVE_FRR_VTYSH
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# FRR vtysh -b backend
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netd_SOURCES += src/vtysh_backend.c src/vtysh_backend.h
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else
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# Linux kernel backend (no FRR)
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netd_SOURCES += src/linux_backend.c src/linux_backend.h
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endif
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endif
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endif
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+17
-1
@@ -24,10 +24,21 @@ AC_ARG_WITH(frr-conf,
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[with_frr_conf=$withval],
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[with_frr_conf=no])
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AC_ARG_WITH(frr-vtysh,
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AS_HELP_STRING([--with-frr-vtysh], [Build with FRR vtysh -b backend (incremental config)]),
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[with_frr_vtysh=$withval],
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[with_frr_vtysh=no])
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# Mutual exclusion check
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AS_IF([test "x$with_frr" = "xyes" -a "x$with_frr_conf" = "xyes"], [
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AC_MSG_ERROR([--with-frr and --with-frr-conf are mutually exclusive])
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])
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AS_IF([test "x$with_frr" = "xyes" -a "x$with_frr_vtysh" = "xyes"], [
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AC_MSG_ERROR([--with-frr and --with-frr-vtysh are mutually exclusive])
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])
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AS_IF([test "x$with_frr_conf" = "xyes" -a "x$with_frr_vtysh" = "xyes"], [
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AC_MSG_ERROR([--with-frr-conf and --with-frr-vtysh are mutually exclusive])
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])
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AS_IF([test "x$with_frr" = "xyes"], [
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# Check for protoc and grpc_cpp_plugin
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@@ -55,8 +66,13 @@ AS_IF([test "x$with_frr_conf" = "xyes"], [
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AC_DEFINE(HAVE_FRR_CONF, 1, [Built with FRR frr.conf file backend])
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])
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AS_IF([test "x$with_frr_vtysh" = "xyes"], [
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AC_DEFINE(HAVE_FRR_VTYSH, 1, [Built with FRR vtysh -b backend])
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])
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AM_CONDITIONAL(HAVE_FRR_GRPC, [test "x$with_frr" = "xyes"])
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AM_CONDITIONAL(HAVE_FRR_CONF, [test "x$with_frr_conf" = "xyes"])
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AM_CONDITIONAL(HAVE_FRR_VTYSH, [test "x$with_frr_vtysh" = "xyes"])
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# Check for pkg-config first
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PKG_PROG_PKG_CONFIG
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@@ -89,7 +105,7 @@ cat <<EOF
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Prefix................: $prefix
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Exec prefix...........: $eprefix
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Sysconfdir............: `eval echo $sysconfdir`
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Backend...............: $(test "x$with_frr" = "xyes" && echo "FRR gRPC" || (test "x$with_frr_conf" = "xyes" && echo "FRR frr.conf" || echo "Linux kernel"))
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Backend...............: $(test "x$with_frr" = "xyes" && echo "FRR gRPC" || (test "x$with_frr_conf" = "xyes" && echo "FRR frr.conf" || (test "x$with_frr_vtysh" = "xyes" && echo "FRR vtysh" || echo "Linux kernel")))
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C Compiler............: $CC $CFLAGS $CPPFLAGS $LDFLAGS $LIBS
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------------- Compiler version --------------
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+15
-8
@@ -7,6 +7,14 @@
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#include "netd.h"
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#include "config.h"
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int debug;
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static sig_atomic_t do_reload;
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static sig_atomic_t do_shutdown;
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static struct route_head active_routes = TAILQ_HEAD_INITIALIZER(active_routes);
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static struct rip_config active_rip;
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/* Backend selection at compile time */
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#ifdef HAVE_FRR_GRPC
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#include "grpc_backend.h"
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@@ -22,6 +30,13 @@ static void backend_cleanup(void) { frrconf_backend_cleanup(); }
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static int backend_apply(struct route_head *routes, struct rip_config *rip) {
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return frrconf_backend_apply(routes, rip);
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}
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#elif defined(HAVE_FRR_VTYSH)
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#include "vtysh_backend.h"
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static int backend_init(void) { return vtysh_backend_init(); }
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static void backend_cleanup(void) { vtysh_backend_cleanup(); }
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static int backend_apply(struct route_head *routes, struct rip_config *rip) {
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return vtysh_backend_apply(routes, rip);
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}
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#else
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#include "linux_backend.h"
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static int backend_init(void) { return linux_backend_init(); }
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@@ -31,14 +46,6 @@ static int backend_apply(struct route_head *routes, struct rip_config *rip) {
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}
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#endif
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int debug;
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static volatile sig_atomic_t do_reload;
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static volatile sig_atomic_t do_shutdown;
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static struct route_head active_routes = TAILQ_HEAD_INITIALIZER(active_routes);
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static struct rip_config active_rip;
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static void sighup_handler(int sig)
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{
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(void)sig;
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@@ -0,0 +1,298 @@
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/* SPDX-License-Identifier: BSD-3-Clause */
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/*
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* FRR vtysh backend for netd - applies incremental route changes
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* by generating a diff (negations of old state + new state) and
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* feeding it to running FRR daemons via `vtysh -b`.
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*
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* Old state is persisted in NETD_CONF so we can recover after a
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* crash — on startup, any routes/config in that file are negated
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* before new config is applied.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include "netd.h"
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#include "vtysh_backend.h"
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#define FRR_CONF "/etc/frr/frr.conf"
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#define FRR_CONF_NEXT FRR_CONF "+"
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#define NETD_CONF "/etc/frr/netd.conf"
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#define NETD_CONF_NEXT NETD_CONF "+"
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#define OSPFD_CONF "/etc/frr/ospfd.conf"
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static const char *frr_header =
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"! Generated by netd\n"
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"frr defaults traditional\n"
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"hostname Router\n"
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"password zebra\n"
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"enable password zebra\n"
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"no log unique-id\n"
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"log syslog warnings\n"
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"log facility local2\n"
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"!\n";
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int vtysh_backend_init(void)
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{
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INFO("Using FRR vtysh backend");
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return 0;
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}
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void vtysh_backend_cleanup(void)
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{
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/* Nothing to clean up */
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}
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static void write_route(FILE *fp, struct route *r)
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{
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char prefix_str[INET6_ADDRSTRLEN];
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char gw_str[INET6_ADDRSTRLEN];
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const char *cmd;
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if (r->family == AF_INET) {
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cmd = "ip";
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inet_ntop(AF_INET, &r->prefix.ip4, prefix_str, sizeof(prefix_str));
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} else {
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cmd = "ipv6";
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inet_ntop(AF_INET6, &r->prefix.ip6, prefix_str, sizeof(prefix_str));
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}
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fprintf(fp, "%s route %s/%u ", cmd, prefix_str, r->prefixlen);
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switch (r->nh_type) {
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case NH_ADDR:
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if (r->family == AF_INET)
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inet_ntop(AF_INET, &r->gateway.gw4, gw_str, sizeof(gw_str));
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else
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inet_ntop(AF_INET6, &r->gateway.gw6, gw_str, sizeof(gw_str));
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fputs(gw_str, fp);
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break;
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case NH_IFNAME:
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fputs(r->ifname, fp);
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break;
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case NH_BLACKHOLE:
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switch (r->bh_type) {
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case BH_NULL:
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fputs("Null0", fp);
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break;
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case BH_REJECT:
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fputs("reject", fp);
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break;
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case BH_DROP:
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fputs("blackhole", fp);
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break;
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}
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break;
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}
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if (r->distance)
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fprintf(fp, " %u", r->distance);
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fputc('\n', fp);
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}
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static const char *redist_name(enum rip_redist_type type)
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{
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switch (type) {
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case RIP_REDIST_CONNECTED: return "connected";
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case RIP_REDIST_STATIC: return "static";
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case RIP_REDIST_KERNEL: return "kernel";
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case RIP_REDIST_OSPF: return "ospf";
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}
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return "unknown";
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}
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static void write_rip_config(FILE *fp, struct rip_config *rip)
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{
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struct rip_redistribute *redist;
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struct rip_neighbor *nbr;
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struct rip_network *net;
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if (!rip->enabled)
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return;
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fputs("router rip\n", fp);
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fprintf(fp, " default-metric %u\n", rip->default_metric);
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fprintf(fp, " distance %u\n", rip->distance);
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fprintf(fp, " timers basic %u %u %u\n",
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rip->timers.update, rip->timers.invalid, rip->timers.flush);
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if (rip->default_route)
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fputs(" default-information originate\n", fp);
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TAILQ_FOREACH(net, &rip->networks, entries) {
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fprintf(fp, " network %s\n", net->ifname);
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if (net->passive)
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fprintf(fp, " passive-interface %s\n", net->ifname);
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}
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TAILQ_FOREACH(nbr, &rip->neighbors, entries) {
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char addr[INET_ADDRSTRLEN];
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inet_ntop(AF_INET, &nbr->addr, addr, sizeof(addr));
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fprintf(fp, " neighbor %s\n", addr);
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}
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TAILQ_FOREACH(redist, &rip->redistributes, entries)
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fprintf(fp, " redistribute %s\n", redist_name(redist->type));
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fputs("!\n", fp);
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}
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static void append_file(FILE *fp, const char *path)
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{
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char buf[1024];
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FILE *src;
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size_t n;
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src = fopen(path, "r");
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if (!src)
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return;
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while ((n = fread(buf, 1, sizeof(buf), src)) > 0)
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fwrite(buf, 1, n, fp);
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fclose(src);
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DEBUG("vtysh: appended %s", path);
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}
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/*
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* Negate old state by reading previous netd.conf and prefixing
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* each config line with "no ". Comment and blank lines are skipped.
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*
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* For "router rip" blocks we emit a single "no router rip" instead
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* of negating each sub-command individually.
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*/
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static void negate_old_conf(FILE *fp)
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{
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char line[256];
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int in_rip = 0;
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int count = 0;
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FILE *old;
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old = fopen(NETD_CONF, "r");
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if (!old) {
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DEBUG("vtysh: no previous %s, first boot", NETD_CONF);
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return;
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}
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while (fgets(line, sizeof(line), old)) {
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size_t len = strlen(line);
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/* Strip trailing newline */
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if (len > 0 && line[len - 1] == '\n')
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line[--len] = '\0';
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/* Skip empty lines and comments */
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if (len == 0 || line[0] == '!' || line[0] == '#')
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continue;
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/* Track router rip block */
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if (strcmp(line, "router rip") == 0) {
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in_rip = 1;
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fputs("no router rip\n", fp);
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count++;
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continue;
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}
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/* Skip sub-commands inside router rip block */
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if (in_rip) {
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/* Sub-commands are indented with space */
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if (line[0] == ' ')
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continue;
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in_rip = 0;
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}
|
||||
|
||||
/* Negate route lines (ip route ..., ipv6 route ...) */
|
||||
fprintf(fp, "no %s\n", line);
|
||||
count++;
|
||||
}
|
||||
|
||||
fclose(old);
|
||||
DEBUG("vtysh: negated %d old config lines", count);
|
||||
}
|
||||
|
||||
/*
|
||||
* Save current config to netd.conf for next reload or crash recovery.
|
||||
* Written atomically via rename.
|
||||
*/
|
||||
static int save_conf(struct route_head *routes, struct rip_config *rip)
|
||||
{
|
||||
struct route *r;
|
||||
FILE *fp;
|
||||
|
||||
fp = fopen(NETD_CONF_NEXT, "w");
|
||||
if (!fp) {
|
||||
ERROR("vtysh: failed to open %s: %s", NETD_CONF_NEXT, strerror(errno));
|
||||
return -1;
|
||||
}
|
||||
|
||||
TAILQ_FOREACH(r, routes, entries)
|
||||
write_route(fp, r);
|
||||
|
||||
write_rip_config(fp, rip);
|
||||
|
||||
fclose(fp);
|
||||
|
||||
if (rename(NETD_CONF_NEXT, NETD_CONF)) {
|
||||
ERROR("vtysh: failed to rename %s to %s: %s",
|
||||
NETD_CONF_NEXT, NETD_CONF, strerror(errno));
|
||||
return -1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int vtysh_backend_apply(struct route_head *routes, struct rip_config *rip)
|
||||
{
|
||||
struct route *r;
|
||||
int rc, count = 0;
|
||||
FILE *fp;
|
||||
|
||||
fp = fopen(FRR_CONF_NEXT, "w");
|
||||
if (!fp) {
|
||||
ERROR("vtysh: failed to open %s: %s", FRR_CONF_NEXT, strerror(errno));
|
||||
return -1;
|
||||
}
|
||||
|
||||
fputs(frr_header, fp);
|
||||
|
||||
/* Negate old state from previous netd.conf */
|
||||
negate_old_conf(fp);
|
||||
|
||||
/* Write new routes */
|
||||
TAILQ_FOREACH(r, routes, entries) {
|
||||
write_route(fp, r);
|
||||
count++;
|
||||
}
|
||||
DEBUG("vtysh: wrote %d new routes", count);
|
||||
|
||||
/* Write new RIP config */
|
||||
write_rip_config(fp, rip);
|
||||
|
||||
/* Append OSPF config if present (written by confd) */
|
||||
append_file(fp, OSPFD_CONF);
|
||||
|
||||
fclose(fp);
|
||||
|
||||
if (rename(FRR_CONF_NEXT, FRR_CONF)) {
|
||||
ERROR("vtysh: failed to rename %s to %s: %s",
|
||||
FRR_CONF_NEXT, FRR_CONF, strerror(errno));
|
||||
return -1;
|
||||
}
|
||||
|
||||
rc = system("vtysh -b");
|
||||
if (rc) {
|
||||
ERROR("vtysh: vtysh -b failed with status %d", rc);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Persist new state for next reload / crash recovery */
|
||||
if (save_conf(routes, rip))
|
||||
ERROR("vtysh: failed to save %s, next reload may be inconsistent", NETD_CONF);
|
||||
|
||||
INFO("vtysh: applied config via vtysh -b");
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,12 @@
|
||||
/* SPDX-License-Identifier: BSD-3-Clause */
|
||||
|
||||
#ifndef NETD_VTYSH_BACKEND_H_
|
||||
#define NETD_VTYSH_BACKEND_H_
|
||||
|
||||
#include "netd.h"
|
||||
|
||||
int vtysh_backend_init(void);
|
||||
void vtysh_backend_cleanup(void);
|
||||
int vtysh_backend_apply(struct route_head *routes, struct rip_config *rip);
|
||||
|
||||
#endif /* NETD_VTYSH_BACKEND_H_ */
|
||||
Reference in New Issue
Block a user