uci: libuci leaking memory on non-existent config file
[project/uci.git] / libuci.c
1 /*
2 * libuci - Library for the Unified Configuration Interface
3 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
4 *
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
8 *
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.
13 */
14
15 /*
16 * This file contains some common code for the uci library
17 */
18
19 #define _GNU_SOURCE
20 #include <sys/types.h>
21 #include <stdbool.h>
22 #include <string.h>
23 #include <stdlib.h>
24 #include <stdio.h>
25 #include <dlfcn.h>
26 #include <glob.h>
27 #include "uci.h"
28
29 static const char *uci_errstr[] = {
30 [UCI_OK] = "Success",
31 [UCI_ERR_MEM] = "Out of memory",
32 [UCI_ERR_INVAL] = "Invalid argument",
33 [UCI_ERR_NOTFOUND] = "Entry not found",
34 [UCI_ERR_IO] = "I/O error",
35 [UCI_ERR_PARSE] = "Parse error",
36 [UCI_ERR_DUPLICATE] = "Duplicate entry",
37 [UCI_ERR_UNKNOWN] = "Unknown error",
38 };
39
40 #include "uci_internal.h"
41 #include "list.c"
42
43 __private const char *uci_confdir = UCI_CONFDIR;
44 __private const char *uci_savedir = UCI_SAVEDIR;
45
46 /* exported functions */
47 struct uci_context *uci_alloc_context(void)
48 {
49 struct uci_context *ctx;
50
51 ctx = (struct uci_context *) malloc(sizeof(struct uci_context));
52 if (!ctx)
53 return NULL;
54
55 memset(ctx, 0, sizeof(struct uci_context));
56 uci_list_init(&ctx->root);
57 uci_list_init(&ctx->delta_path);
58 uci_list_init(&ctx->backends);
59 ctx->flags = UCI_FLAG_STRICT | UCI_FLAG_SAVED_DELTA;
60
61 ctx->confdir = (char *) uci_confdir;
62 ctx->savedir = (char *) uci_savedir;
63
64 uci_list_add(&ctx->backends, &uci_file_backend.e.list);
65 ctx->backend = &uci_file_backend;
66
67 return ctx;
68 }
69
70 void uci_free_context(struct uci_context *ctx)
71 {
72 struct uci_element *e, *tmp;
73
74 if (ctx->confdir != uci_confdir)
75 free(ctx->confdir);
76 if (ctx->savedir != uci_savedir)
77 free(ctx->savedir);
78
79 uci_cleanup(ctx);
80 UCI_TRAP_SAVE(ctx, ignore);
81 uci_foreach_element_safe(&ctx->root, tmp, e) {
82 struct uci_package *p = uci_to_package(e);
83 uci_free_package(&p);
84 }
85 uci_foreach_element_safe(&ctx->delta_path, tmp, e) {
86 uci_free_element(e);
87 }
88 UCI_TRAP_RESTORE(ctx);
89 free(ctx);
90
91 ignore:
92 return;
93 }
94
95 int uci_set_confdir(struct uci_context *ctx, const char *dir)
96 {
97 char *cdir;
98
99 UCI_HANDLE_ERR(ctx);
100 UCI_ASSERT(ctx, dir != NULL);
101
102 cdir = uci_strdup(ctx, dir);
103 if (ctx->confdir != uci_confdir)
104 free(ctx->confdir);
105 ctx->confdir = cdir;
106 return 0;
107 }
108
109 __private void uci_cleanup(struct uci_context *ctx)
110 {
111 struct uci_parse_context *pctx;
112
113 if (ctx->buf) {
114 free(ctx->buf);
115 ctx->buf = NULL;
116 ctx->bufsz = 0;
117 }
118
119 pctx = ctx->pctx;
120 if (!pctx)
121 return;
122
123 ctx->pctx = NULL;
124 if (pctx->package)
125 uci_free_package(&pctx->package);
126
127 if (pctx->buf)
128 free(pctx->buf);
129
130 free(pctx);
131 }
132
133 void
134 uci_perror(struct uci_context *ctx, const char *str)
135 {
136 uci_get_errorstr(ctx, NULL, str);
137 }
138
139 void
140 uci_get_errorstr(struct uci_context *ctx, char **dest, const char *prefix)
141 {
142 static char error_info[128];
143 int err;
144 const char *format =
145 "%s%s" /* prefix */
146 "%s%s" /* function */
147 "%s" /* error */
148 "%s"; /* details */
149
150 error_info[0] = 0;
151
152 if (!ctx)
153 err = UCI_ERR_INVAL;
154 else
155 err = ctx->err;
156
157 if ((err < 0) || (err >= UCI_ERR_LAST))
158 err = UCI_ERR_UNKNOWN;
159
160 switch (err) {
161 case UCI_ERR_PARSE:
162 if (ctx->pctx) {
163 snprintf(error_info, sizeof(error_info) - 1, " (%s) at line %d, byte %d", (ctx->pctx->reason ? ctx->pctx->reason : "unknown"), ctx->pctx->line, ctx->pctx->byte);
164 break;
165 }
166 break;
167 default:
168 break;
169 }
170 if (dest) {
171 err = asprintf(dest, format,
172 (prefix ? prefix : ""), (prefix ? ": " : ""),
173 (ctx && ctx->func ? ctx->func : ""), (ctx && ctx->func ? ": " : ""),
174 uci_errstr[err],
175 error_info);
176 if (err < 0)
177 *dest = NULL;
178 } else {
179 strcat(error_info, "\n");
180 fprintf(stderr, format,
181 (prefix ? prefix : ""), (prefix ? ": " : ""),
182 (ctx && ctx->func ? ctx->func : ""), (ctx && ctx->func ? ": " : ""),
183 uci_errstr[err],
184 error_info);
185 }
186 }
187
188 int uci_list_configs(struct uci_context *ctx, char ***list)
189 {
190 UCI_HANDLE_ERR(ctx);
191 UCI_ASSERT(ctx, list != NULL);
192 UCI_ASSERT(ctx, ctx->backend && ctx->backend->list_configs);
193 *list = ctx->backend->list_configs(ctx);
194 return 0;
195 }
196
197 int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
198 {
199 struct uci_package *p;
200 UCI_HANDLE_ERR(ctx);
201 UCI_ASSERT(ctx, package != NULL);
202 p = *package;
203 UCI_ASSERT(ctx, p != NULL);
204 UCI_ASSERT(ctx, p->backend && p->backend->commit);
205 p->backend->commit(ctx, package, overwrite);
206 return 0;
207 }
208
209 int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
210 {
211 struct uci_package *p;
212
213 UCI_HANDLE_ERR(ctx);
214 UCI_ASSERT(ctx, ctx->backend && ctx->backend->load);
215 p = ctx->backend->load(ctx, name);
216 if (package)
217 *package = p;
218
219 return 0;
220 }
221
222 int uci_set_backend(struct uci_context *ctx, const char *name)
223 {
224 struct uci_element *e;
225
226 UCI_HANDLE_ERR(ctx);
227 UCI_ASSERT(ctx, name != NULL);
228 e = uci_lookup_list(&ctx->backends, name);
229 if (!e)
230 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
231 ctx->backend = uci_to_backend(e);
232 return 0;
233 }