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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 some common code for the uci library
- */
- #define _GNU_SOURCE
- #include <sys/types.h>
- #include <stdbool.h>
- #include <string.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <dlfcn.h>
- #include <glob.h>
- #include "uci.h"
- static const char *uci_errstr[] = {
- [UCI_OK] = "Success",
- [UCI_ERR_MEM] = "Out of memory",
- [UCI_ERR_INVAL] = "Invalid argument",
- [UCI_ERR_NOTFOUND] = "Entry not found",
- [UCI_ERR_IO] = "I/O error",
- [UCI_ERR_PARSE] = "Parse error",
- [UCI_ERR_DUPLICATE] = "Duplicate entry",
- [UCI_ERR_UNKNOWN] = "Unknown error",
- };
- static void uci_unload_plugin(struct uci_context *ctx, struct uci_plugin *p);
- #include "uci_internal.h"
- #include "list.c"
- __private const char *uci_confdir = UCI_CONFDIR;
- __private const char *uci_savedir = UCI_SAVEDIR;
- /* exported functions */
- struct uci_context *uci_alloc_context(void)
- {
- struct uci_context *ctx;
- ctx = (struct uci_context *) malloc(sizeof(struct uci_context));
- if (!ctx)
- return NULL;
- memset(ctx, 0, sizeof(struct uci_context));
- uci_list_init(&ctx->root);
- uci_list_init(&ctx->delta_path);
- uci_list_init(&ctx->backends);
- uci_list_init(&ctx->hooks);
- uci_list_init(&ctx->plugins);
- ctx->flags = UCI_FLAG_STRICT | UCI_FLAG_SAVED_DELTA;
- ctx->confdir = (char *) uci_confdir;
- ctx->savedir = (char *) uci_savedir;
- uci_list_add(&ctx->backends, &uci_file_backend.e.list);
- ctx->backend = &uci_file_backend;
- return ctx;
- }
- void uci_free_context(struct uci_context *ctx)
- {
- struct uci_element *e, *tmp;
- if (ctx->confdir != uci_confdir)
- free(ctx->confdir);
- if (ctx->savedir != uci_savedir)
- free(ctx->savedir);
- uci_cleanup(ctx);
- UCI_TRAP_SAVE(ctx, ignore);
- uci_foreach_element_safe(&ctx->root, tmp, e) {
- struct uci_package *p = uci_to_package(e);
- uci_free_package(&p);
- }
- uci_foreach_element_safe(&ctx->delta_path, tmp, e) {
- uci_free_element(e);
- }
- UCI_TRAP_RESTORE(ctx);
- uci_foreach_element_safe(&ctx->root, tmp, e) {
- uci_unload_plugin(ctx, uci_to_plugin(e));
- }
- free(ctx);
- ignore:
- return;
- }
- int uci_set_confdir(struct uci_context *ctx, const char *dir)
- {
- char *cdir;
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, dir != NULL);
- cdir = uci_strdup(ctx, dir);
- if (ctx->confdir != uci_confdir)
- free(ctx->confdir);
- ctx->confdir = cdir;
- return 0;
- }
- __private void uci_cleanup(struct uci_context *ctx)
- {
- struct uci_parse_context *pctx;
- if (ctx->buf) {
- free(ctx->buf);
- ctx->buf = NULL;
- ctx->bufsz = 0;
- }
- pctx = ctx->pctx;
- if (!pctx)
- return;
- ctx->pctx = NULL;
- if (pctx->package)
- uci_free_package(&pctx->package);
- if (pctx->buf)
- free(pctx->buf);
- free(pctx);
- }
- void
- uci_perror(struct uci_context *ctx, const char *str)
- {
- uci_get_errorstr(ctx, NULL, str);
- }
- void
- uci_get_errorstr(struct uci_context *ctx, char **dest, const char *prefix)
- {
- static char error_info[128];
- int err;
- const char *format =
- "%s%s" /* prefix */
- "%s%s" /* function */
- "%s" /* error */
- "%s"; /* details */
- error_info[0] = 0;
- if (!ctx)
- err = UCI_ERR_INVAL;
- else
- err = ctx->err;
- if ((err < 0) || (err >= UCI_ERR_LAST))
- err = UCI_ERR_UNKNOWN;
- switch (err) {
- case UCI_ERR_PARSE:
- if (ctx->pctx) {
- 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);
- break;
- }
- break;
- default:
- break;
- }
- if (dest) {
- err = asprintf(dest, format,
- (prefix ? prefix : ""), (prefix ? ": " : ""),
- (ctx->func ? ctx->func : ""), (ctx->func ? ": " : ""),
- uci_errstr[err],
- error_info);
- if (err < 0)
- *dest = NULL;
- } else {
- strcat(error_info, "\n");
- fprintf(stderr, format,
- (prefix ? prefix : ""), (prefix ? ": " : ""),
- (ctx->func ? ctx->func : ""), (ctx->func ? ": " : ""),
- uci_errstr[err],
- error_info);
- }
- }
- int uci_list_configs(struct uci_context *ctx, char ***list)
- {
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, list != NULL);
- UCI_ASSERT(ctx, ctx->backend && ctx->backend->list_configs);
- *list = ctx->backend->list_configs(ctx);
- return 0;
- }
- int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
- {
- struct uci_package *p;
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, package != NULL);
- p = *package;
- UCI_ASSERT(ctx, p != NULL);
- UCI_ASSERT(ctx, p->backend && p->backend->commit);
- p->backend->commit(ctx, package, overwrite);
- return 0;
- }
- int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
- {
- struct uci_package *p;
- struct uci_element *e;
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, ctx->backend && ctx->backend->load);
- p = ctx->backend->load(ctx, name);
- uci_foreach_element(&ctx->hooks, e) {
- struct uci_hook *h = uci_to_hook(e);
- if (h->ops->load)
- h->ops->load(h->ops, p);
- }
- if (package)
- *package = p;
- return 0;
- }
- #ifdef UCI_PLUGIN_SUPPORT
- __plugin int uci_add_backend(struct uci_context *ctx, struct uci_backend *b)
- {
- struct uci_element *e;
- UCI_HANDLE_ERR(ctx);
- e = uci_lookup_list(&ctx->backends, b->e.name);
- if (e)
- UCI_THROW(ctx, UCI_ERR_DUPLICATE);
- e = uci_malloc(ctx, sizeof(struct uci_backend));
- memcpy(e, b, sizeof(struct uci_backend));
- uci_list_add(&ctx->backends, &e->list);
- return 0;
- }
- __plugin int uci_del_backend(struct uci_context *ctx, struct uci_backend *b)
- {
- struct uci_element *e, *tmp;
- UCI_HANDLE_ERR(ctx);
- e = uci_lookup_list(&ctx->backends, b->e.name);
- if (!e || uci_to_backend(e)->ptr != b->ptr)
- UCI_THROW(ctx, UCI_ERR_NOTFOUND);
- b = uci_to_backend(e);
- if (ctx->backend && ctx->backend->ptr == b->ptr)
- ctx->backend = &uci_file_backend;
- uci_foreach_element_safe(&ctx->root, tmp, e) {
- struct uci_package *p = uci_to_package(e);
- if (!p->backend)
- continue;
- if (p->backend->ptr == b->ptr)
- UCI_INTERNAL(uci_unload, ctx, p);
- }
- uci_list_del(&b->e.list);
- free(b);
- return 0;
- }
- #endif
- int uci_set_backend(struct uci_context *ctx, const char *name)
- {
- struct uci_element *e;
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, name != NULL);
- e = uci_lookup_list(&ctx->backends, name);
- if (!e)
- UCI_THROW(ctx, UCI_ERR_NOTFOUND);
- ctx->backend = uci_to_backend(e);
- return 0;
- }
- int uci_add_hook(struct uci_context *ctx, const struct uci_hook_ops *ops)
- {
- struct uci_element *e;
- struct uci_hook *h;
- UCI_HANDLE_ERR(ctx);
- /* check for duplicate elements */
- uci_foreach_element(&ctx->hooks, e) {
- h = uci_to_hook(e);
- if (h->ops == ops)
- return UCI_ERR_INVAL;
- }
- h = uci_alloc_element(ctx, hook, "", 0);
- h->ops = ops;
- uci_list_init(&h->e.list);
- uci_list_add(&ctx->hooks, &h->e.list);
- return 0;
- }
- int uci_remove_hook(struct uci_context *ctx, const struct uci_hook_ops *ops)
- {
- struct uci_element *e;
- uci_foreach_element(&ctx->hooks, e) {
- struct uci_hook *h = uci_to_hook(e);
- if (h->ops == ops) {
- uci_list_del(&e->list);
- uci_free_element(e);
- return 0;
- }
- }
- return UCI_ERR_NOTFOUND;
- }
- int uci_load_plugin(struct uci_context *ctx, const char *filename)
- {
- struct uci_plugin *p;
- const struct uci_plugin_ops *ops;
- void *dlh;
- UCI_HANDLE_ERR(ctx);
- dlh = dlopen(filename, RTLD_GLOBAL|RTLD_NOW);
- if (!dlh)
- UCI_THROW(ctx, UCI_ERR_NOTFOUND);
- ops = dlsym(dlh, "uci_plugin");
- if (!ops || !ops->attach || (ops->attach(ctx) != 0)) {
- if (!ops)
- fprintf(stderr, "No ops\n");
- else if (!ops->attach)
- fprintf(stderr, "No attach\n");
- else
- fprintf(stderr, "Other weirdness\n");
- dlclose(dlh);
- UCI_THROW(ctx, UCI_ERR_INVAL);
- }
- p = uci_alloc_element(ctx, plugin, filename, 0);
- p->dlh = dlh;
- p->ops = ops;
- uci_list_add(&ctx->plugins, &p->e.list);
- return 0;
- }
- static void uci_unload_plugin(struct uci_context *ctx, struct uci_plugin *p)
- {
- if (p->ops->detach)
- p->ops->detach(ctx);
- dlclose(p->dlh);
- uci_free_element(&p->e);
- }
- int uci_load_plugins(struct uci_context *ctx, const char *pattern)
- {
- glob_t gl;
- int i;
- if (!pattern)
- pattern = UCI_PREFIX "/lib/uci_*.so";
- memset(&gl, 0, sizeof(gl));
- glob(pattern, 0, NULL, &gl);
- for (i = 0; i < gl.gl_pathc; i++)
- uci_load_plugin(ctx, gl.gl_pathv[i]);
- return 0;
- }
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