+++ /dev/null
-/*
- * 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.
- */
-
-/*
- * This file contains the code for handling uci config history files
- */
-
-#define _GNU_SOURCE
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/file.h>
-#include <stdbool.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <ctype.h>
-
-/* record a change that was done to a package */
-void
-uci_add_history(struct uci_context *ctx, struct uci_list *list, int cmd, const char *section, const char *option, const char *value)
-{
- struct uci_history *h;
- int size = strlen(section) + 1;
- char *ptr;
-
- if (value)
- size += strlen(value) + 1;
-
- h = uci_alloc_element(ctx, history, option, size);
- ptr = uci_dataptr(h);
- h->cmd = cmd;
- h->section = strcpy(ptr, section);
- if (value) {
- ptr += strlen(ptr) + 1;
- h->value = strcpy(ptr, value);
- }
- uci_list_add(list, &h->e.list);
-}
-
-void
-uci_free_history(struct uci_history *h)
-{
- if (!h)
- return;
- if ((h->section != NULL) &&
- (h->section != uci_dataptr(h))) {
- free(h->section);
- free(h->value);
- }
- uci_free_element(&h->e);
-}
-
-
-int uci_set_savedir(struct uci_context *ctx, const char *dir)
-{
- char *sdir;
-
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, dir != NULL);
-
- sdir = uci_strdup(ctx, dir);
- if (ctx->savedir != uci_savedir)
- free(ctx->savedir);
- ctx->savedir = sdir;
- return 0;
-}
-
-int uci_add_history_path(struct uci_context *ctx, const char *dir)
-{
- struct uci_element *e;
-
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, dir != NULL);
- e = uci_alloc_generic(ctx, UCI_TYPE_PATH, dir, sizeof(struct uci_element));
- uci_list_add(&ctx->history_path, &e->list);
-
- return 0;
-}
-
-static inline int uci_parse_history_tuple(struct uci_context *ctx, char **buf, struct uci_ptr *ptr)
-{
- int c = UCI_CMD_CHANGE;
-
- switch(**buf) {
- case '^':
- c = UCI_CMD_REORDER;
- break;
- case '-':
- c = UCI_CMD_REMOVE;
- break;
- case '@':
- c = UCI_CMD_RENAME;
- break;
- case '+':
- /* UCI_CMD_ADD is used for anonymous sections or list values */
- c = UCI_CMD_ADD;
- break;
- case '|':
- c = UCI_CMD_LIST_ADD;
- break;
- }
-
- if (c != UCI_CMD_CHANGE)
- *buf += 1;
-
- UCI_INTERNAL(uci_parse_ptr, ctx, ptr, *buf);
-
- if (!ptr->section)
- goto error;
- if (ptr->flags & UCI_LOOKUP_EXTENDED)
- goto error;
-
- switch(c) {
- case UCI_CMD_REORDER:
- if (!ptr->value || ptr->option)
- goto error;
- break;
- case UCI_CMD_RENAME:
- if (!ptr->value || !uci_validate_name(ptr->value))
- goto error;
- break;
- case UCI_CMD_LIST_ADD:
- if (!ptr->option)
- goto error;
- }
-
- return c;
-
-error:
- UCI_THROW(ctx, UCI_ERR_INVAL);
- return 0;
-}
-
-static void uci_parse_history_line(struct uci_context *ctx, struct uci_package *p, char *buf)
-{
- struct uci_element *e = NULL;
- struct uci_ptr ptr;
- int cmd;
-
- cmd = uci_parse_history_tuple(ctx, &buf, &ptr);
- if (strcmp(ptr.package, p->e.name) != 0)
- goto error;
-
- if (ctx->flags & UCI_FLAG_SAVED_HISTORY)
- uci_add_history(ctx, &p->saved_history, cmd, ptr.section, ptr.option, ptr.value);
-
- switch(cmd) {
- case UCI_CMD_REORDER:
- expand_ptr(ctx, &ptr, true);
- if (!ptr.s)
- UCI_THROW(ctx, UCI_ERR_NOTFOUND);
- UCI_INTERNAL(uci_reorder_section, ctx, ptr.s, strtoul(ptr.value, NULL, 10));
- break;
- case UCI_CMD_RENAME:
- UCI_INTERNAL(uci_rename, ctx, &ptr);
- break;
- case UCI_CMD_REMOVE:
- UCI_INTERNAL(uci_delete, ctx, &ptr);
- break;
- case UCI_CMD_LIST_ADD:
- UCI_INTERNAL(uci_add_list, ctx, &ptr);
- break;
- case UCI_CMD_ADD:
- case UCI_CMD_CHANGE:
- UCI_INTERNAL(uci_set, ctx, &ptr);
- e = ptr.last;
- if (!ptr.option && e && (cmd == UCI_CMD_ADD))
- uci_to_section(e)->anonymous = true;
- break;
- }
- return;
-error:
- UCI_THROW(ctx, UCI_ERR_PARSE);
-}
-
-/* returns the number of changes that were successfully parsed */
-static int uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_package *p)
-{
- struct uci_parse_context *pctx;
- int changes = 0;
-
- /* make sure no memory from previous parse attempts is leaked */
- uci_cleanup(ctx);
-
- pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
- ctx->pctx = pctx;
- pctx->file = stream;
-
- while (!feof(pctx->file)) {
- uci_getln(ctx, 0);
- if (!pctx->buf[0])
- continue;
-
- /*
- * ignore parse errors in single lines, we want to preserve as much
- * history as possible
- */
- UCI_TRAP_SAVE(ctx, error);
- uci_parse_history_line(ctx, p, pctx->buf);
- UCI_TRAP_RESTORE(ctx);
- changes++;
-error:
- continue;
- }
-
- /* no error happened, we can get rid of the parser context now */
- uci_cleanup(ctx);
- return changes;
-}
-
-/* returns the number of changes that were successfully parsed */
-static int uci_load_history_file(struct uci_context *ctx, struct uci_package *p, char *filename, FILE **f, bool flush)
-{
- FILE *stream = NULL;
- int changes = 0;
-
- UCI_TRAP_SAVE(ctx, done);
- stream = uci_open_stream(ctx, filename, SEEK_SET, flush, false);
- if (p)
- changes = uci_parse_history(ctx, stream, p);
- UCI_TRAP_RESTORE(ctx);
-done:
- if (f)
- *f = stream;
- else if (stream)
- uci_close_stream(stream);
- return changes;
-}
-
-/* returns the number of changes that were successfully parsed */
-__private int uci_load_history(struct uci_context *ctx, struct uci_package *p, bool flush)
-{
- struct uci_element *e;
- char *filename = NULL;
- FILE *f = NULL;
- int changes = 0;
-
- if (!p->has_history)
- return 0;
-
- uci_foreach_element(&ctx->history_path, e) {
- if ((asprintf(&filename, "%s/%s", e->name, p->e.name) < 0) || !filename)
- UCI_THROW(ctx, UCI_ERR_MEM);
-
- uci_load_history_file(ctx, p, filename, NULL, false);
- free(filename);
- }
-
- if ((asprintf(&filename, "%s/%s", ctx->savedir, p->e.name) < 0) || !filename)
- UCI_THROW(ctx, UCI_ERR_MEM);
-
- changes = uci_load_history_file(ctx, p, filename, &f, flush);
- if (flush && f && (changes > 0)) {
- rewind(f);
- if (ftruncate(fileno(f), 0) < 0) {
- uci_close_stream(f);
- UCI_THROW(ctx, UCI_ERR_IO);
- }
- }
- if (filename)
- free(filename);
- uci_close_stream(f);
- ctx->err = 0;
- return changes;
-}
-
-static void uci_filter_history(struct uci_context *ctx, const char *name, const char *section, const char *option)
-{
- struct uci_parse_context *pctx;
- struct uci_element *e, *tmp;
- struct uci_list list;
- char *filename = NULL;
- struct uci_ptr ptr;
- FILE *f = NULL;
-
- uci_list_init(&list);
- uci_alloc_parse_context(ctx);
- pctx = ctx->pctx;
-
- if ((asprintf(&filename, "%s/%s", ctx->savedir, name) < 0) || !filename)
- UCI_THROW(ctx, UCI_ERR_MEM);
-
- UCI_TRAP_SAVE(ctx, done);
- f = uci_open_stream(ctx, filename, SEEK_SET, true, false);
- pctx->file = f;
- while (!feof(f)) {
- struct uci_element *e;
- char *buf;
-
- uci_getln(ctx, 0);
- buf = pctx->buf;
- if (!buf[0])
- continue;
-
- /* NB: need to allocate the element before the call to
- * uci_parse_history_tuple, otherwise the original string
- * gets modified before it is saved */
- e = uci_alloc_generic(ctx, UCI_TYPE_HISTORY, pctx->buf, sizeof(struct uci_element));
- uci_list_add(&list, &e->list);
-
- uci_parse_history_tuple(ctx, &buf, &ptr);
- if (section) {
- if (!ptr.section || (strcmp(section, ptr.section) != 0))
- continue;
- }
- if (option) {
- if (!ptr.option || (strcmp(option, ptr.option) != 0))
- continue;
- }
- /* match, drop this element again */
- uci_free_element(e);
- }
-
- /* rebuild the history file */
- rewind(f);
- if (ftruncate(fileno(f), 0) < 0)
- UCI_THROW(ctx, UCI_ERR_IO);
- uci_foreach_element_safe(&list, tmp, e) {
- fprintf(f, "%s\n", e->name);
- uci_free_element(e);
- }
- UCI_TRAP_RESTORE(ctx);
-
-done:
- if (filename)
- free(filename);
- uci_close_stream(pctx->file);
- uci_foreach_element_safe(&list, tmp, e) {
- uci_free_element(e);
- }
- uci_cleanup(ctx);
-}
-
-int uci_revert(struct uci_context *ctx, struct uci_ptr *ptr)
-{
- char *package = NULL;
- char *section = NULL;
- char *option = NULL;
-
- UCI_HANDLE_ERR(ctx);
- expand_ptr(ctx, ptr, false);
- UCI_ASSERT(ctx, ptr->p->has_history);
-
- /*
- * - flush unwritten changes
- * - save the package name
- * - unload the package
- * - filter the history
- * - reload the package
- */
- UCI_TRAP_SAVE(ctx, error);
- UCI_INTERNAL(uci_save, ctx, ptr->p);
-
- /* NB: need to clone package, section and option names,
- * as they may get freed on uci_free_package() */
- package = uci_strdup(ctx, ptr->p->e.name);
- if (ptr->section)
- section = uci_strdup(ctx, ptr->section);
- if (ptr->option)
- option = uci_strdup(ctx, ptr->option);
-
- uci_free_package(&ptr->p);
- uci_filter_history(ctx, package, section, option);
-
- UCI_INTERNAL(uci_load, ctx, package, &ptr->p);
- UCI_TRAP_RESTORE(ctx);
- ctx->err = 0;
-
-error:
- if (package)
- free(package);
- if (section)
- free(section);
- if (option)
- free(option);
- if (ctx->err)
- UCI_THROW(ctx, ctx->err);
- return 0;
-}
-
-int uci_save(struct uci_context *ctx, struct uci_package *p)
-{
- FILE *f = NULL;
- char *filename = NULL;
- struct uci_element *e, *tmp;
- struct stat statbuf;
-
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, p != NULL);
-
- /*
- * if the config file was outside of the /etc/config path,
- * don't save the history to a file, update the real file
- * directly.
- * does not modify the uci_package pointer
- */
- if (!p->has_history)
- return uci_commit(ctx, &p, false);
-
- if (uci_list_empty(&p->history))
- return 0;
-
- if (stat(ctx->savedir, &statbuf) < 0)
- mkdir(ctx->savedir, UCI_DIRMODE);
- else if ((statbuf.st_mode & S_IFMT) != S_IFDIR)
- UCI_THROW(ctx, UCI_ERR_IO);
-
- if ((asprintf(&filename, "%s/%s", ctx->savedir, p->e.name) < 0) || !filename)
- UCI_THROW(ctx, UCI_ERR_MEM);
-
- uci_foreach_element(&ctx->hooks, tmp) {
- struct uci_hook *hook = uci_to_hook(tmp);
-
- if (!hook->ops->set)
- continue;
-
- uci_foreach_element(&p->history, e) {
- hook->ops->set(hook->ops, p, uci_to_history(e));
- }
- }
-
- ctx->err = 0;
- UCI_TRAP_SAVE(ctx, done);
- f = uci_open_stream(ctx, filename, SEEK_END, true, true);
- UCI_TRAP_RESTORE(ctx);
-
- uci_foreach_element_safe(&p->history, tmp, e) {
- struct uci_history *h = uci_to_history(e);
- char *prefix = "";
-
- switch(h->cmd) {
- case UCI_CMD_REMOVE:
- prefix = "-";
- break;
- case UCI_CMD_RENAME:
- prefix = "@";
- break;
- case UCI_CMD_ADD:
- prefix = "+";
- break;
- case UCI_CMD_REORDER:
- prefix = "^";
- break;
- case UCI_CMD_LIST_ADD:
- prefix = "|";
- break;
- default:
- break;
- }
-
- fprintf(f, "%s%s.%s", prefix, p->e.name, h->section);
- if (e->name)
- fprintf(f, ".%s", e->name);
-
- if (h->cmd == UCI_CMD_REMOVE)
- fprintf(f, "\n");
- else
- fprintf(f, "=%s\n", h->value);
- uci_free_history(h);
- }
-
-done:
- uci_close_stream(f);
- if (filename)
- free(filename);
- if (ctx->err)
- UCI_THROW(ctx, ctx->err);
-
- return 0;
-}
-
-
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