2 * libuci - Library for the Unified Configuration Interface
3 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU Lesser General Public License for more details.
16 * This file contains misc utility functions and wrappers to standard
17 * functions, which throw exceptions upon failure.
20 #include <sys/types.h>
33 #include "uci_internal.h"
35 __private void *uci_malloc(struct uci_context *ctx, size_t size)
41 UCI_THROW(ctx, UCI_ERR_MEM);
47 __private void *uci_realloc(struct uci_context *ctx, void *ptr, size_t size)
49 ptr = realloc(ptr, size);
51 UCI_THROW(ctx, UCI_ERR_MEM);
56 __private char *uci_strdup(struct uci_context *ctx, const char *str)
62 UCI_THROW(ctx, UCI_ERR_MEM);
68 * validate strings for names and types, reject special characters
69 * for names, only alphanum and _ is allowed (shell compatibility)
70 * for types, we allow more characters
72 __private bool uci_validate_str(const char *str, bool name, bool package)
78 unsigned char c = *str;
80 if (isalnum(c) || c == '_')
83 if (c == '-' && package)
86 if (name || (c < 33) || (c > 126))
92 bool uci_validate_text(const char *str)
95 unsigned char c = *str;
97 if (c < 32 && c != '\t' && c != '\n' && c != '\r')
105 __private void uci_alloc_parse_context(struct uci_context *ctx)
107 ctx->pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
110 int uci_parse_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str)
116 UCI_ASSERT(ctx, str);
117 UCI_ASSERT(ctx, ptr);
119 memset(ptr, 0, sizeof(struct uci_ptr));
122 last = strchr(str, '=');
129 ptr->package = strsep(&str, ".");
133 ptr->section = strsep(&str, ".");
135 ptr->target = UCI_TYPE_PACKAGE;
139 ptr->option = strsep(&str, ".");
141 ptr->target = UCI_TYPE_SECTION;
144 ptr->target = UCI_TYPE_OPTION;
147 tmp = strsep(&str, ".");
152 if (ptr->package && !uci_validate_package(ptr->package))
154 if (ptr->section && !uci_validate_name(ptr->section))
155 ptr->flags |= UCI_LOOKUP_EXTENDED;
156 if (ptr->option && !uci_validate_name(ptr->option))
158 if (ptr->value && !uci_validate_text(ptr->value))
164 memset(ptr, 0, sizeof(struct uci_ptr));
165 UCI_THROW(ctx, UCI_ERR_PARSE);
169 __private void uci_parse_error(struct uci_context *ctx, char *reason)
171 struct uci_parse_context *pctx = ctx->pctx;
173 pctx->reason = reason;
174 pctx->byte = pctx_pos(pctx);
175 UCI_THROW(ctx, UCI_ERR_PARSE);
181 * open a stream and go to the right position
183 * note: when opening for write and seeking to the beginning of
184 * the stream, truncate the file
186 __private FILE *uci_open_stream(struct uci_context *ctx, const char *filename, const char *origfilename, int pos, bool write, bool create)
191 int flags = (write ? O_RDWR : O_RDONLY);
192 mode_t mode = UCI_FILEMODE;
194 char *filename2 = NULL;
199 name = basename((char *) origfilename);
201 name = basename((char *) filename);
203 if ((asprintf(&filename2, "%s/%s", ctx->confdir, name) < 0) || !filename2) {
204 UCI_THROW(ctx, UCI_ERR_MEM);
206 if (stat(filename2, &statbuf) == 0)
207 mode = statbuf.st_mode;
213 if (!write && ((stat(filename, &statbuf) < 0) ||
214 ((statbuf.st_mode & S_IFMT) != S_IFREG))) {
215 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
218 fd = open(filename, flags, mode);
222 ret = flock(fd, (write ? LOCK_EX : LOCK_SH));
223 if ((ret < 0) && (errno != ENOSYS))
226 ret = lseek(fd, 0, pos);
231 file = fdopen(fd, (write ? "w+" : "r"));
236 UCI_THROW(ctx, UCI_ERR_IO);
241 __private void uci_close_stream(FILE *stream)