Import the initial, proof of concept implementation.

8 files changed, 708 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..88f9974
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+_build/*
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..40c8ae6
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,505 @@
+GNU LESSER GENERAL PUBLIC LICENSE
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diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..2cfc1bc
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,82 @@
+BUILDDIR=_build
+VPATH=$(BUILDDIR)
+OCAMLDIR=$(shell ocamlopt -where)
+$(shell mkdir -p $(BUILDDIR) $(BUILDDIR)/stub $(BUILDDIR)/lib $(BUILDDIR)/stub_generator $(BUILDDIR)/test $(BUILDDIR)/generated)
+PACKAGES=vyconf,ctypes.stubs,ctypes.foreign
+
+# The files used to build the stub generator.
+GENERATOR_FILES=$(BUILDDIR)/lib/bindings.cmx		\
+                $(BUILDDIR)/stub_generator/generate.cmx
+
+# The files from which we'll build a shared library.
+LIBFILES=$(BUILDDIR)/lib/bindings.cmx			\
+         $(BUILDDIR)/generated/vyosconfig_bindings.cmx	\
+         $(BUILDDIR)/lib/apply_bindings.cmx		\
+         $(BUILDDIR)/generated/vyosconfig.o
+
+CAML_INIT=$(BUILDDIR)/stub/init.o
+
+# The files that we'll generate
+GENERATED=$(BUILDDIR)/generated/vyosconfig.h \
+          $(BUILDDIR)/generated/vyosconfig.c \
+          $(BUILDDIR)/generated/vyosconfig_bindings.ml
+
+OSTYPE:=$(shell ocamlfind ocamlc -config | awk '/^os_type:/ {print $$2}')
+SYSTEM:=$(shell ocamlfind ocamlc -config | awk '/^system:/ {print $$2}')
+EXTDLL:=$(shell ocamlfind ocamlc -config | awk '/^ext_dll:/ {print $$2}')
+CC:= $(shell ocamlfind ocamlc -config | awk '/^bytecomp_c_compiler/ {for(i=2;i<=NF;i++) printf "%s " ,$$i}')
+
+ifeq ($(OSTYPE),$(filter $(OSTYPE),Win32 Cygwin))
+EXTEXE=.exe
+else
+EXTEXE=
+endif
+
+GENERATOR=$(BUILDDIR)/generate$(EXTEXE)
+
+all: sharedlib
+
+sharedlib: $(BUILDDIR)/libvyosconfig$(EXTDLL)
+
+
+ifeq ($(OSTYPE),$(filter $(OSTYPE),Win32 Cygwin))
+$(BUILDDIR)/libvyosconfig$(EXTDLL): $(CAML_INIT) $(LIBFILES)
+	ocamlfind opt -o $@ -linkpkg -output-obj -verbose -package $(PACKAGES) $^
+else ifeq ($(SYSTEM),$(filter $(SYSTEM),macosx))
+$(BUILDDIR)/libvyosconfig$(EXTDLL): $(CAML_INIT) $(LIBFILES)
+	ocamlfind opt -o $@ -linkpkg -runtime-variant _pic -verbose -ccopt -dynamiclib -package $(PACKAGES) $^
+else
+$(BUILDDIR)/libvyosconfig$(EXTDLL): $(CAML_INIT) $(LIBFILES)
+	ocamlfind opt -o $@ -linkpkg -output-obj -runtime-variant _pic -verbose -package $(PACKAGES) -ccopt "-Wl,-soname,libvyosconfig.so.0" $^
+endif
+
+stubs: $(GENERATED)
+
+$(BUILDDIR)/stub/%.o:
+	ocamlc -g -c stub/init.c
+	mv init.o $@
+
+$(GENERATED): $(GENERATOR)
+	$(GENERATOR) $(BUILDDIR)/generated
+
+$(BUILDDIR)/%.o: %.c
+	$(CC) -c -o $@ -fPIC -I $(shell ocamlfind query ctypes) -I $(OCAMLDIR) -I $(OCAMLDIR)/../ctypes $<
+
+$(BUILDDIR)/%.cmx: %.ml
+	ocamlfind opt -c -o $@ -I $(BUILDDIR)/generated -I $(BUILDDIR)/lib -package $(PACKAGES) $<
+
+$(GENERATOR): $(GENERATOR_FILES)
+	ocamlfind opt -o $@ -linkpkg -package $(PACKAGES) $^
+
+clean:
+	rm -rf $(BUILDDIR)
+
+test: all
+	$(MAKE) -C $@
+ifeq ($(OSTYPE),Win32)
+	PATH="$(BUILDDIR):$(PATH)" _build/test/test.native test/ocaml.svg
+else
+	LD_LIBRARY_PATH=$(BUILDDIR) _build/test/test.native test/ocaml.svg
+endif
+
+.PHONY: test
diff --git a/README b/README
new file mode 100644
index 0000000..9ea9c66
--- /dev/null
+++ b/README
@@ -0,0 +1,13 @@
+libvyosconfig
+=============
+
+This library mixes the multiway tree manipulation libraries from [vyconf](https://github.com/vyos/vyconf)
+with a parser and a formatter for VyOS 1.x config format, and is meant to be used in config migration scripts
+and analysis/conversion tools.
+
+It is not really properly packaged now and has undeclared build dependencies on VyConf (obviously) and also
+assumed that OCaml installation is per-user (through opam) rather than system-wide.
+
+The main purpose is to provide bindings for Python, so using this library directly from C is strongly
+discourages: not just the interface is not guaranteed to be stable, it's written to be a bridge between
+two high level languages so it would be very inconvenient to use from C.
diff --git a/lib/apply_bindings.ml b/lib/apply_bindings.ml
new file mode 100644
index 0000000..3d88388
--- /dev/null
+++ b/lib/apply_bindings.ml
@@ -0,0 +1,3 @@
+(** Apply the Stubs functor to the generated bindings to link the generated
+    code into the library. *)
+include Bindings.Stubs(Vyosconfig_bindings)
diff --git a/lib/bindings.ml b/lib/bindings.ml
new file mode 100644
index 0000000..387e1b5
--- /dev/null
+++ b/lib/bindings.ml
@@ -0,0 +1,65 @@
+open Ctypes
+open Foreign
+
+module CT = Config_tree
+
+let make_config_tree name = Ctypes.Root.create (Config_tree.make name)
+
+let destroy c_ptr = 
+    Root.release c_ptr
+
+let set_add_value c_ptr path value =
+    let ct = Root.get c_ptr in
+    let path = Pcre.split ~rex:(Pcre.regexp "\\s+") path in
+    try
+        let new_ct = CT.set ct path (Some value) Config_tree.AddValue in
+        Root.set c_ptr new_ct;
+        0 (* return 0 *)
+    with CT.Duplicate_value -> 1
+
+let set_replace_value c_ptr path value =
+    let	ct = Root.get c_ptr in
+    let	path = Pcre.split ~rex:(Pcre.regexp "\\s+") path in
+    let new_ct = Config_tree.set ct path (Some value) Config_tree.ReplaceValue in
+    Root.set c_ptr new_ct;
+    0 (* return 0 *)
+
+let set_valueless c_ptr path =
+    let	ct = Root.get c_ptr in
+    let	path = Pcre.split ~rex:(Pcre.regexp "\\s+") path in
+    try
+        let new_ct = Config_tree.set ct path None CT.AddValue in
+        Root.set c_ptr new_ct;
+        0 (* return 0 *)
+    with CT.Useless_set -> 1
+
+let delete_value c_ptr path value =
+    let ct = Root.get c_ptr in
+    let path = Pcre.split ~rex:(Pcre.regexp "\\s+") path in
+    try
+        let new_ct = Config_tree.delete ct path (Some value) in
+        Root.set c_ptr new_ct;
+        0 (* return 0 *)
+    with CT.No_such_value -> 1
+
+let delete_node c_ptr path =
+    let ct = Root.get c_ptr in
+    let path = Pcre.split ~rex:(Pcre.regexp "\\s+") path in
+    if not (Vytree.exists ct path) then 1 else
+    let new_ct = Config_tree.delete ct path None in
+    Root.set c_ptr new_ct;
+    0 (* return 0 *)
+
+
+module Stubs(I : Cstubs_inverted.INTERNAL) =
+struct
+
+  let () = I.internal "make" (string @-> returning (ptr void)) make_config_tree
+  let () = I.internal "destroy" ((ptr void) @-> returning void) destroy
+  let () = I.internal "set_add_value" ((ptr void) @-> string @-> string @-> returning int) set_add_value
+  let () = I.internal "set_replace_value" ((ptr void) @-> string @-> string @-> returning int) set_replace_value
+  let () = I.internal "set_valueless" ((ptr void) @-> string @-> returning int) set_valueless
+  let () = I.internal "delete_value" ((ptr void) @-> string @-> string @-> returning int) delete_value
+  let () = I.internal "delete_node" ((ptr void) @-> string @-> returning int) delete_node
+
+end
diff --git a/stub/init.c b/stub/init.c
new file mode 100644
index 0000000..20508b8
--- /dev/null
+++ b/stub/init.c
@@ -0,0 +1,9 @@
+#include <caml/callback.h>
+
+__attribute__ ((__constructor__))
+void
+init(void)
+{
+  char *caml_argv[1] = { NULL };
+  caml_startup(caml_argv);
+}
diff --git a/stub_generator/generate.ml b/stub_generator/generate.ml
new file mode 100644
index 0000000..48ac707
--- /dev/null
+++ b/stub_generator/generate.ml
@@ -0,0 +1,30 @@
+(** A driver for stub generation.  Build OCaml and C code from the
+    Bindings.Stubs functor. *)
+
+let generate dirname =
+  let prefix = "vyosconfig" in
+  let path basename = Filename.concat dirname basename in
+  let ml_fd = open_out (path "vyosconfig_bindings.ml") in
+  let c_fd = open_out (path "vyosconfig.c") in
+  let h_fd = open_out (path "vyosconfig.h") in
+  let stubs = (module Bindings.Stubs : Cstubs_inverted.BINDINGS) in
+  begin
+    (* Generate the ML module that links in the generated C. *)
+    Cstubs_inverted.write_ml 
+      (Format.formatter_of_out_channel ml_fd) ~prefix stubs;
+
+    (* Generate the C source file that exports OCaml functions. *)
+    Format.fprintf (Format.formatter_of_out_channel c_fd)
+      "#include \"vyosconfig.h\"@\n%a"
+      (Cstubs_inverted.write_c ~prefix) stubs;
+
+    (* Generate the C header file that exports OCaml functions. *)
+    Cstubs_inverted.write_c_header 
+      (Format.formatter_of_out_channel h_fd) ~prefix stubs;
+
+  end;
+  close_out h_fd;
+  close_out c_fd;
+  close_out ml_fd
+
+let () = generate (Sys.argv.(1))