2 * libuci plugin for Lua
3 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2
7 * as published by the Free Software Foundation
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
15 #include <sys/types.h>
28 #define METANAME MODNAME ".meta"
32 #define DPRINTF(...) fprintf(stderr, __VA_ARGS__)
34 #define DPRINTF(...) do {} while (0)
37 #if !defined LUA_VERSION_NUM || LUA_VERSION_NUM==501
40 * ** Adapted from Lua 5.2.0
42 static void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
43 luaL_checkstack(L, nup+1, "too many upvalues");
44 for (; l->name != NULL; l++) { /* fill the table with given functions */
46 lua_pushstring(L, l->name);
47 for (i = 0; i < nup; i++) /* copy upvalues to the top */
48 lua_pushvalue(L, -(nup+1));
49 lua_pushcclosure(L, l->func, nup); /* closure with those upvalues */
50 lua_settable(L, -(nup + 3));
52 lua_pop(L, nup); /* remove upvalues */
55 #define lua_rawlen(L, i) lua_objlen(L, i)
59 static struct uci_context *global_ctx = NULL;
61 static struct uci_context *
62 find_context(lua_State *L, int *offset)
64 struct uci_context **ctx;
65 if (!lua_isuserdata(L, 1)) {
67 global_ctx = uci_alloc_context();
69 luaL_error(L, "failed to allocate UCI context");
79 ctx = luaL_checkudata(L, 1, METANAME);
81 luaL_error(L, "failed to get UCI context");
88 static struct uci_package *
89 find_package(lua_State *L, struct uci_context *ctx, const char *str, bool al)
91 struct uci_package *p = NULL;
92 struct uci_element *e;
96 sep = strchr(str, '.');
98 name = malloc(1 + sep - str);
100 luaL_error(L, "out of memory");
103 strncpy(name, str, sep - str);
108 uci_foreach_element(&ctx->root, e) {
109 if (strcmp(e->name, name) != 0)
112 p = uci_to_package(e);
117 uci_load(ctx, name, &p);
126 lookup_args(lua_State *L, struct uci_context *ctx, int offset, struct uci_ptr *ptr, char **buf)
132 luaL_checkstring(L, 1 + offset);
133 s = strdup(lua_tostring(L, 1 + offset));
137 memset(ptr, 0, sizeof(struct uci_ptr));
138 if (!find_package(L, ctx, s, true))
141 switch (n - offset) {
144 ptr->option = luaL_checkstring(L, 3 + offset);
147 ptr->section = luaL_checkstring(L, 2 + offset);
148 ptr->package = luaL_checkstring(L, 1 + offset);
149 if (uci_lookup_ptr(ctx, ptr, NULL, true) != UCI_OK)
153 if (uci_lookup_ptr(ctx, ptr, s, true) != UCI_OK)
157 luaL_error(L, "invalid argument count");
171 uci_push_status(lua_State *L, struct uci_context *ctx, bool hasarg)
176 lua_pushboolean(L, (ctx->err == UCI_OK));
178 uci_get_errorstr(ctx, &str, MODNAME);
180 lua_pushstring(L, str);
189 uci_push_option(lua_State *L, struct uci_option *o)
191 struct uci_element *e;
195 case UCI_TYPE_STRING:
196 lua_pushstring(L, o->v.string);
200 uci_foreach_element(&o->v.list, e) {
202 lua_pushstring(L, e->name);
203 lua_rawseti(L, -2, i);
213 uci_push_section(lua_State *L, struct uci_section *s, int index)
215 struct uci_element *e;
218 lua_pushboolean(L, s->anonymous);
219 lua_setfield(L, -2, ".anonymous");
220 lua_pushstring(L, s->type);
221 lua_setfield(L, -2, ".type");
222 lua_pushstring(L, s->e.name);
223 lua_setfield(L, -2, ".name");
225 lua_pushinteger(L, index);
226 lua_setfield(L, -2, ".index");
229 uci_foreach_element(&s->options, e) {
230 struct uci_option *o = uci_to_option(e);
231 uci_push_option(L, o);
232 lua_setfield(L, -2, o->e.name);
237 uci_push_package(lua_State *L, struct uci_package *p)
239 struct uci_element *e;
243 uci_foreach_element(&p->sections, e) {
244 uci_push_section(L, uci_to_section(e), i);
245 lua_setfield(L, -2, e->name);
251 uci_lua_unload(lua_State *L)
253 struct uci_context *ctx;
254 struct uci_package *p;
258 ctx = find_context(L, &offset);
259 luaL_checkstring(L, 1 + offset);
260 s = lua_tostring(L, 1 + offset);
261 p = find_package(L, ctx, s, false);
264 return uci_push_status(L, ctx, false);
266 lua_pushboolean(L, 0);
272 uci_lua_load(lua_State *L)
274 struct uci_context *ctx;
275 struct uci_package *p = NULL;
279 ctx = find_context(L, &offset);
281 lua_pop(L, 1); /* bool ret value of unload */
282 s = lua_tostring(L, -1);
284 uci_load(ctx, s, &p);
285 return uci_push_status(L, ctx, false);
290 uci_lua_foreach(lua_State *L)
292 struct uci_context *ctx;
293 struct uci_package *p;
294 struct uci_element *e, *tmp;
295 const char *package, *type;
300 ctx = find_context(L, &offset);
301 package = luaL_checkstring(L, 1 + offset);
303 if (lua_isnil(L, 2 + offset))
306 type = luaL_checkstring(L, 2 + offset);
308 if (!lua_isfunction(L, 3 + offset) || !package)
309 return luaL_error(L, "Invalid argument");
311 p = find_package(L, ctx, package, true);
315 uci_foreach_element_safe(&p->sections, tmp, e) {
316 struct uci_section *s = uci_to_section(e);
320 if (type && (strcmp(s->type, type) != 0))
323 lua_pushvalue(L, 3 + offset); /* iterator function */
324 uci_push_section(L, s, i - 1);
325 if (lua_pcall(L, 1, 1, 0) == 0) {
327 if (lua_isboolean(L, -1) && !lua_toboolean(L, -1))
338 lua_pushboolean(L, ret);
343 uci_lua_get_any(lua_State *L, bool all)
345 struct uci_context *ctx;
346 struct uci_element *e = NULL;
350 int err = UCI_ERR_NOTFOUND;
352 ctx = find_context(L, &offset);
354 if (lookup_args(L, ctx, offset, &ptr, &s))
357 uci_lookup_ptr(ctx, &ptr, NULL, true);
358 if (!all && !ptr.s) {
362 if (!(ptr.flags & UCI_LOOKUP_COMPLETE)) {
363 err = UCI_ERR_NOTFOUND;
370 case UCI_TYPE_PACKAGE:
371 uci_push_package(L, ptr.p);
373 case UCI_TYPE_SECTION:
375 uci_push_section(L, ptr.s, -1);
377 lua_pushstring(L, ptr.s->type);
379 case UCI_TYPE_OPTION:
380 uci_push_option(L, ptr.o);
396 return uci_push_status(L, ctx, true);
400 uci_lua_get(lua_State *L)
402 return uci_lua_get_any(L, false);
406 uci_lua_get_all(lua_State *L)
408 return uci_lua_get_any(L, true);
412 uci_lua_add(lua_State *L)
414 struct uci_context *ctx;
415 struct uci_section *s = NULL;
416 struct uci_package *p;
419 const char *name = NULL;
422 ctx = find_context(L, &offset);
423 package = luaL_checkstring(L, 1 + offset);
424 type = luaL_checkstring(L, 2 + offset);
425 p = find_package(L, ctx, package, true);
429 if (uci_add_section(ctx, p, type, &s) || !s)
433 lua_pushstring(L, name);
438 return uci_push_status(L, ctx, true);
442 uci_lua_delete(lua_State *L)
444 struct uci_context *ctx;
449 ctx = find_context(L, &offset);
451 if (lookup_args(L, ctx, offset, &ptr, &s))
454 uci_delete(ctx, &ptr);
459 return uci_push_status(L, ctx, false);
463 uci_lua_rename(lua_State *L)
465 struct uci_context *ctx;
467 int err = UCI_ERR_MEM;
469 int nargs, offset = 0;
471 ctx = find_context(L, &offset);
472 nargs = lua_gettop(L);
473 if (lookup_args(L, ctx, offset, &ptr, &s))
476 switch(nargs - offset) {
478 /* Format: uci.set("p.s.o=v") or uci.set("p.s=v") */
481 /* Format: uci.set("p", "s", "o", "v") */
482 ptr.value = luaL_checkstring(L, nargs);
485 /* Format: uci.set("p", "s", "v") */
486 ptr.value = ptr.option;
494 err = uci_lookup_ptr(ctx, &ptr, NULL, true);
498 if (((ptr.s == NULL) && (ptr.option != NULL)) || (ptr.value == NULL)) {
503 err = uci_rename(ctx, &ptr);
510 return uci_push_status(L, ctx, false);
514 uci_lua_reorder(lua_State *L)
516 struct uci_context *ctx;
518 int err = UCI_ERR_MEM;
520 int nargs, offset = 0;
522 ctx = find_context(L, &offset);
523 nargs = lua_gettop(L);
524 if (lookup_args(L, ctx, offset, &ptr, &s))
527 switch(nargs - offset) {
529 /* Format: uci.set("p.s=v") or uci.set("p.s=v") */
536 /* Format: uci.set("p", "s", "v") */
537 ptr.value = ptr.option;
545 err = uci_lookup_ptr(ctx, &ptr, NULL, true);
549 if ((ptr.s == NULL) || (ptr.value == NULL)) {
554 err = uci_reorder_section(ctx, ptr.s, strtoul(ptr.value, NULL, 10));
561 return uci_push_status(L, ctx, false);
566 uci_lua_set(lua_State *L)
568 struct uci_context *ctx;
570 bool istable = false;
571 int err = UCI_ERR_MEM;
574 int i, nargs, offset = 0;
576 ctx = find_context(L, &offset);
577 nargs = lua_gettop(L);
578 if (lookup_args(L, ctx, offset, &ptr, &s))
581 switch(nargs - offset) {
583 /* Format: uci.set("p.s.o=v") or uci.set("p.s=v") */
586 /* Format: uci.set("p", "s", "o", "v") */
587 if (lua_istable(L, nargs)) {
588 if (lua_rawlen(L, nargs) < 1)
589 return luaL_error(L, "Cannot set an uci option to an empty table value");
590 lua_rawgeti(L, nargs, 1);
591 ptr.value = luaL_checkstring(L, -1);
595 ptr.value = luaL_checkstring(L, nargs);
599 /* Format: uci.set("p", "s", "v") */
600 ptr.value = ptr.option;
608 err = uci_lookup_ptr(ctx, &ptr, NULL, true);
612 if (((ptr.s == NULL) && (ptr.option != NULL)) || (ptr.value == NULL)) {
618 if (lua_rawlen(L, nargs) == 1) {
623 err = uci_delete(ctx, &ptr);
630 err = uci_set(ctx, &ptr);
635 for (; i <= lua_rawlen(L, nargs); i++) {
636 lua_rawgeti(L, nargs, i);
637 ptr.value = luaL_checkstring(L, -1);
638 err = uci_add_list(ctx, &ptr);
644 err = uci_set(ctx, &ptr);
653 return uci_push_status(L, ctx, false);
663 uci_lua_package_cmd(lua_State *L, enum pkg_cmd cmd)
665 struct uci_context *ctx;
666 struct uci_element *e, *tmp;
669 int nargs, offset = 0;
671 ctx = find_context(L, &offset);
672 nargs = lua_gettop(L);
673 if ((cmd != CMD_REVERT) && (nargs - offset > 1))
676 if (lookup_args(L, ctx, offset, &ptr, &s))
679 uci_lookup_ptr(ctx, &ptr, NULL, true);
681 uci_foreach_element_safe(&ctx->root, tmp, e) {
682 struct uci_package *p = uci_to_package(e);
684 if (ptr.p && (ptr.p != p))
690 uci_commit(ctx, &p, false);
696 uci_revert(ctx, &ptr);
704 return uci_push_status(L, ctx, false);
708 uci_lua_save(lua_State *L)
710 return uci_lua_package_cmd(L, CMD_SAVE);
714 uci_lua_commit(lua_State *L)
716 return uci_lua_package_cmd(L, CMD_COMMIT);
720 uci_lua_revert(lua_State *L)
722 return uci_lua_package_cmd(L, CMD_REVERT);
726 uci_lua_add_change(lua_State *L, struct uci_element *e)
736 lua_getfield(L, -1, h->section);
737 if (lua_isnil(L, -1)) {
740 lua_pushvalue(L, -1); /* copy for setfield */
741 lua_setfield(L, -3, h->section);
745 value = h->value ? h->value : "";
748 lua_getfield(L, -1, name);
750 /* this delta is a list add operation */
751 if (h->cmd == UCI_CMD_LIST_ADD) {
752 /* there seems to be no table yet */
753 if (!lua_istable(L, -1)) {
756 /* if there is a value on the stack already, add */
757 if (!lua_isnil(L, -2)) {
758 lua_pushvalue(L, -2);
759 lua_rawseti(L, -2, 1);
760 lua_pushstring(L, value);
761 lua_rawseti(L, -2, 2);
763 /* this is the first table item */
765 lua_pushstring(L, value);
766 lua_rawseti(L, -2, 1);
769 lua_setfield(L, -3, name);
771 /* a table is on the top of the stack and this is a subsequent,
772 * list_add, append this value to table */
774 lua_pushstring(L, value);
775 lua_rawseti(L, -2, lua_rawlen(L, -2) + 1);
778 /* non-list change, simply set/replace field */
780 lua_pushstring(L, value);
781 lua_setfield(L, -3, name);
786 lua_pushstring(L, value);
787 lua_setfield(L, -2, ".type");
794 uci_lua_changes_pkg(lua_State *L, struct uci_context *ctx, const char *package)
796 struct uci_package *p = NULL;
797 struct uci_element *e;
798 bool autoload = false;
800 p = find_package(L, ctx, package, false);
803 p = find_package(L, ctx, package, true);
808 if (uci_list_empty(&p->delta) && uci_list_empty(&p->saved_delta))
812 uci_foreach_element(&p->saved_delta, e) {
813 uci_lua_add_change(L, e);
815 uci_foreach_element(&p->delta, e) {
816 uci_lua_add_change(L, e);
818 lua_setfield(L, -2, p->e.name);
826 uci_lua_changes(lua_State *L)
828 struct uci_context *ctx;
829 const char *package = NULL;
830 char **config = NULL;
834 ctx = find_context(L, &offset);
835 nargs = lua_gettop(L);
836 switch(nargs - offset) {
838 package = luaL_checkstring(L, 1 + offset);
842 return luaL_error(L, "invalid argument count");
847 uci_lua_changes_pkg(L, ctx, package);
849 if (uci_list_configs(ctx, &config) != 0)
852 for(i = 0; config[i] != NULL; i++) {
853 uci_lua_changes_pkg(L, ctx, config[i]);
862 uci_lua_get_confdir(lua_State *L)
864 struct uci_context *ctx = find_context(L, NULL);
865 lua_pushstring(L, ctx->confdir);
870 uci_lua_set_confdir(lua_State *L)
872 struct uci_context *ctx;
875 ctx = find_context(L, &offset);
876 luaL_checkstring(L, 1 + offset);
877 uci_set_confdir(ctx, lua_tostring(L, -1));
878 return uci_push_status(L, ctx, false);
882 uci_lua_get_savedir(lua_State *L)
884 struct uci_context *ctx = find_context(L, NULL);
885 lua_pushstring(L, ctx->savedir);
890 uci_lua_add_delta(lua_State *L)
892 struct uci_context *ctx;
895 ctx = find_context(L, &offset);
896 luaL_checkstring(L, 1 + offset);
897 uci_add_delta_path(ctx, lua_tostring(L, -1));
898 return uci_push_status(L, ctx, false);
902 uci_lua_set_savedir(lua_State *L)
904 struct uci_context *ctx;
907 ctx = find_context(L, &offset);
908 luaL_checkstring(L, 1 + offset);
909 uci_set_savedir(ctx, lua_tostring(L, -1));
910 return uci_push_status(L, ctx, false);
914 uci_lua_list_configs(lua_State *L)
916 struct uci_context *ctx;
917 char **configs = NULL;
921 ctx = find_context(L, NULL);
922 if ((uci_list_configs(ctx, &configs) != UCI_OK) || !configs)
923 return uci_push_status(L, ctx, false);
925 for (ptr = configs; *ptr; ptr++) {
926 lua_pushstring(L, *ptr);
927 lua_rawseti(L, -2, i++);
934 uci_lua_gc(lua_State *L)
936 struct uci_context **ctx;
938 if (!lua_isuserdata(L, 1)) {
943 ctx = luaL_checkudata(L, 1, METANAME);
947 uci_free_context(*ctx);
953 uci_lua_cursor(lua_State *L)
955 struct uci_context **u;
956 int argc = lua_gettop(L);
958 u = lua_newuserdata(L, sizeof(struct uci_context *));
959 luaL_getmetatable(L, METANAME);
960 lua_setmetatable(L, -2);
962 *u = uci_alloc_context();
964 return luaL_error(L, "Cannot allocate UCI context");
967 if (lua_isstring(L, 2) &&
968 (uci_set_savedir(*u, luaL_checkstring(L, 2)) != UCI_OK))
969 return luaL_error(L, "Unable to set savedir");
972 if (lua_isstring(L, 1) &&
973 (uci_set_confdir(*u, luaL_checkstring(L, 1)) != UCI_OK))
974 return luaL_error(L, "Unable to set savedir");
982 static const luaL_Reg uci[] = {
983 { "__gc", uci_lua_gc },
984 { "close", uci_lua_gc },
985 { "cursor", uci_lua_cursor },
986 { "load", uci_lua_load },
987 { "unload", uci_lua_unload },
988 { "get", uci_lua_get },
989 { "get_all", uci_lua_get_all },
990 { "add", uci_lua_add },
991 { "set", uci_lua_set },
992 { "rename", uci_lua_rename },
993 { "save", uci_lua_save },
994 { "delete", uci_lua_delete },
995 { "commit", uci_lua_commit },
996 { "revert", uci_lua_revert },
997 { "reorder", uci_lua_reorder },
998 { "changes", uci_lua_changes },
999 { "foreach", uci_lua_foreach },
1000 { "add_history", uci_lua_add_delta },
1001 { "add_delta", uci_lua_add_delta },
1002 { "get_confdir", uci_lua_get_confdir },
1003 { "set_confdir", uci_lua_set_confdir },
1004 { "get_savedir", uci_lua_get_savedir },
1005 { "set_savedir", uci_lua_set_savedir },
1006 { "list_configs", uci_lua_list_configs },
1012 luaopen_uci(lua_State *L)
1014 /* create metatable */
1015 luaL_newmetatable(L, METANAME);
1017 /* metatable.__index = metatable */
1018 lua_pushvalue(L, -1);
1019 lua_setfield(L, -2, "__index");
1021 /* fill metatable */
1022 luaL_setfuncs(L, uci, 0);
1027 lua_pushvalue(L, -1);
1028 luaL_setfuncs(L, uci, 0);
1029 lua_setglobal(L, MODNAME);