Mirror of the official OpenWrt uci repository https://git.openwrt.org/project/uci
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/*
* 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 Lesser General Public License for more details.
*/
/*
* This file contains misc utility functions and wrappers to standard
* functions, which throw exceptions upon failure.
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <stdbool.h>
#include <unistd.h>
#include <ctype.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <libgen.h>
#include "uci.h"
#include "uci_internal.h"
__private void *uci_malloc(struct uci_context *ctx, size_t size)
{
void *ptr;
ptr = calloc(1, size);
if (!ptr)
UCI_THROW(ctx, UCI_ERR_MEM);
return ptr;
}
__private void *uci_realloc(struct uci_context *ctx, void *ptr, size_t size)
{
ptr = realloc(ptr, size);
if (!ptr)
UCI_THROW(ctx, UCI_ERR_MEM);
return ptr;
}
__private char *uci_strdup(struct uci_context *ctx, const char *str)
{
char *ptr;
ptr = strdup(str);
if (!ptr)
UCI_THROW(ctx, UCI_ERR_MEM);
return ptr;
}
/*
* validate strings for names and types, reject special characters
* for names, only alphanum and _ is allowed (shell compatibility)
* for types, we allow more characters
*/
__private bool uci_validate_str(const char *str, bool name, bool package)
{
if (!*str)
return false;
for (; *str; str++) {
unsigned char c = *str;
if (isalnum(c) || c == '_')
continue;
if (c == '-' && package)
continue;
if (name || (c < 33) || (c > 126))
return false;
}
return true;
}
bool uci_validate_text(const char *str)
{
while (*str) {
unsigned char c = *str;
if (c < 32 && c != '\t' && c != '\n' && c != '\r')
return false;
str++;
}
return true;
}
__private void uci_alloc_parse_context(struct uci_context *ctx)
{
ctx->pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
}
int uci_parse_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str)
{
char *last = NULL;
char *tmp;
UCI_HANDLE_ERR(ctx);
UCI_ASSERT(ctx, str);
UCI_ASSERT(ctx, ptr);
memset(ptr, 0, sizeof(struct uci_ptr));
/* value */
last = strchr(str, '=');
if (last) {
*last = 0;
last++;
ptr->value = last;
}
ptr->package = strsep(&str, ".");
if (!ptr->package)
goto error;
ptr->section = strsep(&str, ".");
if (!ptr->section) {
ptr->target = UCI_TYPE_PACKAGE;
goto lastval;
}
ptr->option = strsep(&str, ".");
if (!ptr->option) {
ptr->target = UCI_TYPE_SECTION;
goto lastval;
} else {
ptr->target = UCI_TYPE_OPTION;
}
tmp = strsep(&str, ".");
if (tmp)
goto error;
lastval:
if (ptr->package && !uci_validate_package(ptr->package))
goto error;
if (ptr->section && !uci_validate_name(ptr->section))
ptr->flags |= UCI_LOOKUP_EXTENDED;
if (ptr->option && !uci_validate_name(ptr->option))
goto error;
if (ptr->value && !uci_validate_text(ptr->value))
goto error;
return 0;
error:
memset(ptr, 0, sizeof(struct uci_ptr));
UCI_THROW(ctx, UCI_ERR_PARSE);
}
__private void uci_parse_error(struct uci_context *ctx, char *reason)
{
struct uci_parse_context *pctx = ctx->pctx;
pctx->reason = reason;
pctx->byte = pctx_pos(pctx);
UCI_THROW(ctx, UCI_ERR_PARSE);
}
/*
* open a stream and go to the right position
*
* note: when opening for write and seeking to the beginning of
* the stream, truncate the file
*/
__private FILE *uci_open_stream(struct uci_context *ctx, const char *filename, const char *origfilename, int pos, bool write, bool create)
{
struct stat statbuf;
FILE *file = NULL;
int fd, ret;
int flags = (write ? O_RDWR : O_RDONLY);
mode_t mode = UCI_FILEMODE;
char *name = NULL;
char *filename2 = NULL;
if (create) {
flags |= O_CREAT;
if (origfilename) {
name = basename((char *) origfilename);
} else {
name = basename((char *) filename);
}
if ((asprintf(&filename2, "%s/%s", ctx->confdir, name) < 0) || !filename2) {
UCI_THROW(ctx, UCI_ERR_MEM);
} else {
if (stat(filename2, &statbuf) == 0)
mode = statbuf.st_mode;
free(filename2);
}
}
if (!write && ((stat(filename, &statbuf) < 0) ||
((statbuf.st_mode & S_IFMT) != S_IFREG))) {
UCI_THROW(ctx, UCI_ERR_NOTFOUND);
}
fd = open(filename, flags, mode);
if (fd < 0)
goto error;
ret = flock(fd, (write ? LOCK_EX : LOCK_SH));
if ((ret < 0) && (errno != ENOSYS))
goto error_close;
ret = lseek(fd, 0, pos);
if (ret < 0)
goto error_unlock;
file = fdopen(fd, (write ? "w+" : "r"));
if (file)
goto done;
error_unlock:
flock(fd, LOCK_UN);
error_close:
close(fd);
error:
UCI_THROW(ctx, UCI_ERR_IO);
done:
return file;
}
__private void uci_close_stream(FILE *stream)
{
int fd;
if (!stream)
return;
fflush(stream);
fd = fileno(stream);
flock(fd, LOCK_UN);
fclose(stream);
}