-/*
- * libuci - Library for the Unified Configuration Interface
- * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1
- * as published by the Free Software Foundation
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-#include <glob.h>
-
-/* initialize a list head/item */
-static inline void uci_list_init(struct uci_list *ptr)
-{
- ptr->prev = ptr;
- ptr->next = ptr;
-}
-
-/* inserts a new list entry after a given entry */
-static inline void uci_list_insert(struct uci_list *list, struct uci_list *ptr)
-{
- list->next->prev = ptr;
- ptr->prev = list;
- ptr->next = list->next;
- list->next = ptr;
-}
-
-/* inserts a new list entry at the tail of the list */
-static inline void uci_list_add(struct uci_list *head, struct uci_list *ptr)
-{
- /* NB: head->prev points at the tail */
- uci_list_insert(head->prev, ptr);
-}
-
-static inline void uci_list_del(struct uci_list *ptr)
-{
- struct uci_list *next, *prev;
-
- next = ptr->next;
- prev = ptr->prev;
-
- prev->next = next;
- next->prev = prev;
-
- uci_list_init(ptr);
-}
-
-/*
- * uci_alloc_generic allocates a new uci_element with payload
- * payload is appended to the struct to save memory and reduce fragmentation
- */
-static struct uci_element *
-uci_alloc_generic(struct uci_context *ctx, int type, const char *name, int size)
-{
- struct uci_element *e;
- int datalen = size;
- void *ptr;
-
- ptr = uci_malloc(ctx, datalen);
- e = (struct uci_element *) ptr;
- e->type = type;
- if (name) {
- UCI_TRAP_SAVE(ctx, error);
- e->name = uci_strdup(ctx, name);
- UCI_TRAP_RESTORE(ctx);
- }
- uci_list_init(&e->list);
- goto done;
-
-error:
- free(ptr);
- UCI_THROW(ctx, ctx->errno);
-
-done:
- return e;
-}
-
-static void
-uci_free_element(struct uci_element *e)
-{
- if (e->name)
- free(e->name);
- if (!uci_list_empty(&e->list))
- uci_list_del(&e->list);
- free(e);
-}
-
-static struct uci_option *
-uci_alloc_option(struct uci_section *s, const char *name, const char *value)
-{
- struct uci_package *p = s->package;
- struct uci_context *ctx = p->ctx;
- struct uci_option *o;
-
- o = uci_alloc_element(ctx, option, name, strlen(value) + 1);
- o->value = uci_dataptr(o);
- o->section = s;
- strcpy(o->value, value);
- uci_list_add(&s->options, &o->e.list);
-
- return o;
-}
-
-static inline void
-uci_free_option(struct uci_option *o)
-{
- if ((o->value != uci_dataptr(o)) &&
- (o->value != NULL))
- free(o->value);
- uci_free_element(&o->e);
-}
-
-static struct uci_section *
-uci_alloc_section(struct uci_package *p, const char *type, const char *name)
-{
- struct uci_context *ctx = p->ctx;
- struct uci_section *s;
-
- if (name && !name[0])
- name = NULL;
-
- s = uci_alloc_element(ctx, section, name, strlen(type) + 1);
- uci_list_init(&s->options);
- s->type = uci_dataptr(s);
- s->package = p;
- strcpy(s->type, type);
- if (name == NULL)
- s->anonymous = true;
-
- uci_list_add(&p->sections, &s->e.list);
-
- return s;
-}
-
-static void
-uci_free_section(struct uci_section *s)
-{
- struct uci_element *o, *tmp;
-
- uci_foreach_element_safe(&s->options, tmp, o) {
- uci_free_option(uci_to_option(o));
- }
- if ((s->type != uci_dataptr(s)) &&
- (s->type != NULL))
- free(s->type);
- uci_free_element(&s->e);
-}
-
-static struct uci_package *
-uci_alloc_package(struct uci_context *ctx, const char *name)
-{
- struct uci_package *p;
-
- p = uci_alloc_element(ctx, package, name, 0);
- p->ctx = ctx;
- uci_list_init(&p->sections);
- uci_list_init(&p->history);
- uci_list_init(&p->saved_history);
- return p;
-}
-
-static void
-uci_free_package(struct uci_package **package)
-{
- struct uci_element *e, *tmp;
- struct uci_package *p = *package;
-
- if(!p)
- return;
-
- if (p->path)
- free(p->path);
- uci_foreach_element_safe(&p->sections, tmp, e) {
- uci_free_section(uci_to_section(e));
- }
- uci_foreach_element_safe(&p->history, tmp, e) {
- uci_free_history(uci_to_history(e));
- }
- uci_foreach_element_safe(&p->saved_history, tmp, e) {
- uci_free_history(uci_to_history(e));
- }
- uci_free_element(&p->e);
- *package = NULL;
-}
-
-static struct uci_element *uci_lookup_list(struct uci_context *ctx, struct uci_list *list, const char *name)
-{
- struct uci_element *e;
-
- uci_foreach_element(list, e) {
- if (!strcmp(e->name, name))
- return e;
- }
- return NULL;
-}
-
-int uci_lookup(struct uci_context *ctx, struct uci_element **res, struct uci_package *p, char *section, char *option)
-{
- struct uci_element *e;
- struct uci_section *s;
-
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, res != NULL);
- UCI_ASSERT(ctx, p != NULL);
- UCI_ASSERT(ctx, uci_validate_name(section));
- if (option)
- UCI_ASSERT(ctx, uci_validate_name(option));
-
- e = uci_lookup_list(ctx, &p->sections, section);
- if (!e)
- goto notfound;
-
- if (option) {
- s = uci_to_section(e);
- e = uci_lookup_list(ctx, &s->options, option);
- if (!e)
- goto notfound;
- }
-
- *res = e;
- return 0;
-
-notfound:
- UCI_THROW(ctx, UCI_ERR_NOTFOUND);
- return 0;
-}
-
-int uci_del_element(struct uci_context *ctx, struct uci_element *e)
-{
- /* NB: UCI_INTERNAL use means without history tracking */
- bool internal = ctx->internal;
- struct uci_package *p = NULL;
- struct uci_section *s = NULL;
- struct uci_option *o = NULL;
- struct uci_element *i, *tmp;
- char *option = NULL;
-
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, e != NULL);
-
- switch(e->type) {
- case UCI_TYPE_SECTION:
- s = uci_to_section(e);
- uci_foreach_element_safe(&s->options, tmp, i) {
- uci_del_element(ctx, i);
- }
- break;
- case UCI_TYPE_OPTION:
- o = uci_to_option(e);
- s = o->section;
- p = s->package;
- option = e->name;
- break;
- default:
- UCI_THROW(ctx, UCI_ERR_INVAL);
- break;
- }
-
- p = s->package;
- if (!internal && p->confdir)
- uci_add_history(ctx, &p->history, UCI_CMD_REMOVE, s->e.name, option, NULL);
-
- switch(e->type) {
- case UCI_TYPE_SECTION:
- uci_free_section(s);
- break;
- case UCI_TYPE_OPTION:
- uci_free_option(o);
- break;
- default:
- break;
- }
- return 0;
-}
-
-int uci_set_element_value(struct uci_context *ctx, struct uci_element **element, char *value)
-{
- /* NB: UCI_INTERNAL use means without history tracking */
- bool internal = ctx->internal;
- struct uci_list *list;
- struct uci_element *e;
- struct uci_package *p;
- struct uci_section *s;
- char *section;
- char *option;
- char *str;
- int size;
-
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, (element != NULL) && (*element != NULL));
-
- /* what the 'value' of an element means depends on the type
- * for a section, the 'value' means its type
- * for an option, the 'value' means its value string
- * when changing the value, shrink the element to its actual size
- * (it may have been allocated with a bigger size, to include
- * its buffer)
- * then duplicate the string passed on the command line and
- * insert it into the structure.
- */
- e = *element;
- list = e->list.prev;
- switch(e->type) {
- case UCI_TYPE_SECTION:
- UCI_ASSERT(ctx, uci_validate_str(value, false));
- size = sizeof(struct uci_section);
- s = uci_to_section(e);
- section = e->name;
- option = NULL;
- break;
- case UCI_TYPE_OPTION:
- UCI_ASSERT(ctx, value != NULL);
- size = sizeof(struct uci_option);
- s = uci_to_option(e)->section;
- section = s->e.name;
- option = e->name;
- break;
- default:
- UCI_THROW(ctx, UCI_ERR_INVAL);
- return 0;
- }
- p = s->package;
- if (!internal && p->confdir)
- uci_add_history(ctx, &p->history, UCI_CMD_CHANGE, section, option, value);
-
- uci_list_del(&e->list);
- e = uci_realloc(ctx, e, size);
- str = uci_strdup(ctx, value);
- uci_list_insert(list, &e->list);
- *element = e;
-
- switch(e->type) {
- case UCI_TYPE_SECTION:
- uci_to_section(e)->type = str;
- break;
- case UCI_TYPE_OPTION:
- uci_to_option(e)->value = str;
- break;
- default:
- break;
- }
-
- return 0;
-}
-
-int uci_rename(struct uci_context *ctx, struct uci_package *p, char *section, char *option, char *name)
-{
- /* NB: UCI_INTERNAL use means without history tracking */
- bool internal = ctx->internal;
- struct uci_element *e;
-
- UCI_HANDLE_ERR(ctx);
-
- /* NB: p, section, option validated by uci_lookup */
- UCI_INTERNAL(uci_lookup, ctx, &e, p, section, option);
-
- if (!internal && p->confdir)
- uci_add_history(ctx, &p->history, UCI_CMD_RENAME, section, option, name);
-
- name = uci_strdup(ctx, name);
- if (e->name)
- free(e->name);
- e->name = name;
-
- return 0;
-}
-
-
-int uci_delete(struct uci_context *ctx, struct uci_package *p, char *section, char *option)
-{
- /* NB: pass on internal flag to uci_del_element */
- bool internal = ctx->internal;
- struct uci_element *e;
-
- UCI_HANDLE_ERR(ctx);
-
- /* NB: p, section, option validated by uci_lookup */
- UCI_INTERNAL(uci_lookup, ctx, &e, p, section, option);
-
- ctx->internal = internal;
- return uci_del_element(ctx, e);
-}
-
-int uci_set(struct uci_context *ctx, struct uci_package *p, char *section, char *option, char *value, struct uci_element *res)
-{
- /* NB: UCI_INTERNAL use means without history tracking */
- bool internal = ctx->internal;
- struct uci_element *e = NULL;
- struct uci_section *s = NULL;
- struct uci_option *o = NULL;
-
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, p != NULL);
- UCI_ASSERT(ctx, uci_validate_name(section));
- if (option) {
- UCI_ASSERT(ctx, uci_validate_name(option));
- UCI_ASSERT(ctx, value != NULL);
- } else {
- UCI_ASSERT(ctx, uci_validate_str(value, false));
- }
-
- /*
- * look up the package, section and option (if set)
- * if the section/option is to be modified and it is not found
- * create a new element in the appropriate list
- */
- e = uci_lookup_list(ctx, &p->sections, section);
- if (!e)
- goto notfound;
-
- s = uci_to_section(e);
- if (ctx->pctx && ctx->pctx->merge)
- ctx->pctx->section = s;
-
- if (option) {
- e = uci_lookup_list(ctx, &s->options, option);
- if (!e)
- goto notfound;
- o = uci_to_option(e);
- }
-
- /*
- * no unknown element was supplied, assume that we can just update
- * an existing entry
- */
- if (o)
- e = &o->e;
- else
- e = &s->e;
- if (res)
- *res = e;
- else
- res = &e;
-
- ctx->internal = internal;
- return uci_set_element_value(ctx, res, value);
-
-notfound:
- /*
- * the entry that we need to update was not found,
- * check if the search failed prematurely.
- * this can happen if the package was not found, or if
- * an option was supplied, but the section wasn't found
- */
- if (!p || (!s && option))
- UCI_THROW(ctx, UCI_ERR_NOTFOUND);
-
- /* now add the missing entry */
- if (!internal && p->confdir)
- uci_add_history(ctx, &p->history, UCI_CMD_ADD, section, option, value);
- if (s)
- uci_alloc_option(s, option, value);
- else {
- s = uci_alloc_section(p, value, section);
- if (ctx->pctx && ctx->pctx->merge)
- ctx->pctx->section = s;
- }
-
- return 0;
-}
-
-int uci_unload(struct uci_context *ctx, struct uci_package *p)
-{
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, p != NULL);
-
- uci_free_package(&p);
- return 0;
-}
-
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