Mirror of the official OpenWrt uci repository
https://git.openwrt.org/project/uci
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257 lines
5.1 KiB
257 lines
5.1 KiB
/*
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* libuci - Library for the Unified Configuration Interface
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* Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*/
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/*
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* This file contains misc utility functions and wrappers to standard
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* functions, which throw exceptions upon failure.
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*/
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#define _GNU_SOURCE
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libgen.h>
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#include "uci.h"
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#include "uci_internal.h"
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__private void *uci_malloc(struct uci_context *ctx, size_t size)
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{
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void *ptr;
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ptr = calloc(1, size);
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if (!ptr)
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UCI_THROW(ctx, UCI_ERR_MEM);
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return ptr;
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}
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__private void *uci_realloc(struct uci_context *ctx, void *ptr, size_t size)
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{
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ptr = realloc(ptr, size);
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if (!ptr)
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UCI_THROW(ctx, UCI_ERR_MEM);
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return ptr;
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}
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__private char *uci_strdup(struct uci_context *ctx, const char *str)
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{
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char *ptr;
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ptr = strdup(str);
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if (!ptr)
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UCI_THROW(ctx, UCI_ERR_MEM);
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return ptr;
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}
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/*
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* validate strings for names and types, reject special characters
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* for names, only alphanum and _ is allowed (shell compatibility)
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* for types, we allow more characters
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*/
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__private bool uci_validate_str(const char *str, bool name, bool package)
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{
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if (!*str)
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return false;
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for (; *str; str++) {
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unsigned char c = *str;
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if (isalnum(c) || c == '_')
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continue;
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if (c == '-' && package)
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continue;
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if (name || (c < 33) || (c > 126))
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return false;
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}
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return true;
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}
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bool uci_validate_text(const char *str)
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{
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while (*str) {
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unsigned char c = *str;
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if (c < 32 && c != '\t' && c != '\n' && c != '\r')
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return false;
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str++;
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}
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return true;
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}
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__private void uci_alloc_parse_context(struct uci_context *ctx)
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{
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ctx->pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
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}
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int uci_parse_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str)
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{
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char *last = NULL;
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char *tmp;
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UCI_HANDLE_ERR(ctx);
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UCI_ASSERT(ctx, str);
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UCI_ASSERT(ctx, ptr);
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memset(ptr, 0, sizeof(struct uci_ptr));
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/* value */
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last = strchr(str, '=');
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if (last) {
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*last = 0;
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last++;
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ptr->value = last;
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}
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ptr->package = strsep(&str, ".");
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if (!ptr->package)
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goto error;
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ptr->section = strsep(&str, ".");
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if (!ptr->section) {
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ptr->target = UCI_TYPE_PACKAGE;
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goto lastval;
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}
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ptr->option = strsep(&str, ".");
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if (!ptr->option) {
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ptr->target = UCI_TYPE_SECTION;
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goto lastval;
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} else {
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ptr->target = UCI_TYPE_OPTION;
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}
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tmp = strsep(&str, ".");
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if (tmp)
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goto error;
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lastval:
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if (ptr->package && !uci_validate_package(ptr->package))
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goto error;
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if (ptr->section && !uci_validate_name(ptr->section))
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ptr->flags |= UCI_LOOKUP_EXTENDED;
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if (ptr->option && !uci_validate_name(ptr->option))
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goto error;
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if (ptr->value && !uci_validate_text(ptr->value))
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goto error;
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return 0;
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error:
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memset(ptr, 0, sizeof(struct uci_ptr));
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UCI_THROW(ctx, UCI_ERR_PARSE);
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}
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__private void uci_parse_error(struct uci_context *ctx, char *reason)
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{
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struct uci_parse_context *pctx = ctx->pctx;
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pctx->reason = reason;
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pctx->byte = pctx_pos(pctx);
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UCI_THROW(ctx, UCI_ERR_PARSE);
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}
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/*
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* open a stream and go to the right position
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*
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* note: when opening for write and seeking to the beginning of
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* the stream, truncate the file
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*/
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__private FILE *uci_open_stream(struct uci_context *ctx, const char *filename, const char *origfilename, int pos, bool write, bool create)
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{
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struct stat statbuf;
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FILE *file = NULL;
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int fd, ret;
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int flags = (write ? O_RDWR : O_RDONLY);
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mode_t mode = UCI_FILEMODE;
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char *name = NULL;
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char *filename2 = NULL;
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if (create) {
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flags |= O_CREAT;
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if (origfilename) {
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name = basename((char *) origfilename);
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} else {
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name = basename((char *) filename);
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}
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if ((asprintf(&filename2, "%s/%s", ctx->confdir, name) < 0) || !filename2) {
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UCI_THROW(ctx, UCI_ERR_MEM);
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} else {
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if (stat(filename2, &statbuf) == 0)
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mode = statbuf.st_mode;
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free(filename2);
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}
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}
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if (!write && ((stat(filename, &statbuf) < 0) ||
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((statbuf.st_mode & S_IFMT) != S_IFREG))) {
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UCI_THROW(ctx, UCI_ERR_NOTFOUND);
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}
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fd = open(filename, flags, mode);
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if (fd < 0)
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goto error;
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ret = flock(fd, (write ? LOCK_EX : LOCK_SH));
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if ((ret < 0) && (errno != ENOSYS))
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goto error_close;
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ret = lseek(fd, 0, pos);
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if (ret < 0)
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goto error_unlock;
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file = fdopen(fd, (write ? "w+" : "r"));
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if (file)
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goto done;
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error_unlock:
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flock(fd, LOCK_UN);
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error_close:
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close(fd);
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error:
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UCI_THROW(ctx, UCI_ERR_IO);
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done:
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return file;
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}
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__private void uci_close_stream(FILE *stream)
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{
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int fd;
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if (!stream)
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return;
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fflush(stream);
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fd = fileno(stream);
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flock(fd, LOCK_UN);
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fclose(stream);
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}
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