--- /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 delta 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_delta(struct uci_context *ctx, struct uci_list *list, int cmd, const char *section, const char *option, const char *value)
+{
+ struct uci_delta *h;
+ int size = strlen(section) + 1;
+ char *ptr;
+
+ if (value)
+ size += strlen(value) + 1;
+
+ h = uci_alloc_element(ctx, delta, 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_delta(struct uci_delta *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_delta_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->delta_path, &e->list);
+
+ return 0;
+}
+
+static inline int uci_parse_delta_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_delta_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_delta_tuple(ctx, &buf, &ptr);
+ if (strcmp(ptr.package, p->e.name) != 0)
+ goto error;
+
+ if (ctx->flags & UCI_FLAG_SAVED_DELTA)
+ uci_add_delta(ctx, &p->saved_delta, 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_delta(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
+ * delta as possible
+ */
+ UCI_TRAP_SAVE(ctx, error);
+ uci_parse_delta_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_delta_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_delta(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_delta(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_delta)
+ return 0;
+
+ uci_foreach_element(&ctx->delta_path, e) {
+ if ((asprintf(&filename, "%s/%s", e->name, p->e.name) < 0) || !filename)
+ UCI_THROW(ctx, UCI_ERR_MEM);
+
+ uci_load_delta_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_delta_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_delta(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_delta_tuple, otherwise the original string
+ * gets modified before it is saved */
+ e = uci_alloc_generic(ctx, UCI_TYPE_DELTA, pctx->buf, sizeof(struct uci_element));
+ uci_list_add(&list, &e->list);
+
+ uci_parse_delta_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 delta 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_delta);
+
+ /*
+ * - flush unwritten changes
+ * - save the package name
+ * - unload the package
+ * - filter the delta
+ * - 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_delta(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 delta to a file, update the real file
+ * directly.
+ * does not modify the uci_package pointer
+ */
+ if (!p->has_delta)
+ return uci_commit(ctx, &p, false);
+
+ if (uci_list_empty(&p->delta))
+ 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->delta, e) {
+ hook->ops->set(hook->ops, p, uci_to_delta(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->delta, tmp, e) {
+ struct uci_delta *h = uci_to_delta(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_delta(h);
+ }
+
+done:
+ uci_close_stream(f);
+ if (filename)
+ free(filename);
+ if (ctx->err)
+ UCI_THROW(ctx, ctx->err);
+
+ return 0;
+}
+
+
projects / project / uci.git / blobdiff