blob.c

   1 /*
   2  * blob.c - uci <-> blobmsg conversion layer
   3  * Copyright (C) 2012-2013 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 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17
  18 #include <libubox/blobmsg.h>
  19 #include "uci.h"
  20 #include "uci_blob.h"
  21
  22 static bool
  23 uci_attr_to_blob(struct blob_buf *b, const char *str,
  24                  const char *name, enum blobmsg_type type)
  25 {
  26         char *err;
  27         int intval;
  28
  29         switch (type) {
  30         case BLOBMSG_TYPE_STRING:
  31                 blobmsg_add_string(b, name, str);
  32                 break;
  33         case BLOBMSG_TYPE_BOOL:
  34                 if (!strcmp(str, "true") || !strcmp(str, "1"))
  35                         intval = 1;
  36                 else if (!strcmp(str, "false") || !strcmp(str, "0"))
  37                         intval = 0;
  38                 else
  39                         return false;
  40
  41                 blobmsg_add_u8(b, name, intval);
  42                 break;
  43         case BLOBMSG_TYPE_INT32:
  44                 intval = strtol(str, &err, 0);
  45                 if (*err)
  46                         return false;
  47
  48                 blobmsg_add_u32(b, name, intval);
  49                 break;
  50         default:
  51                 return false;
  52         }
  53         return true;
  54 }
  55
  56 static void
  57 uci_array_to_blob(struct blob_buf *b, struct uci_option *o,
  58                   enum blobmsg_type type)
  59 {
  60         struct uci_element *e;
  61         char *str, *next, *word;
  62
  63         if (o->type == UCI_TYPE_LIST) {
  64                 uci_foreach_element(&o->v.list, e) {
  65                         uci_attr_to_blob(b, e->name, NULL, type);
  66                 }
  67                 return;
  68         }
  69
  70         str = strdup(o->v.string);
  71         next = str;
  72
  73         while ((word = strsep(&next, " \t")) != NULL) {
  74                 if (!*word)
  75                         continue;
  76
  77                 uci_attr_to_blob(b, word, NULL, type);
  78         }
  79
  80         free(str);
  81 }
  82
  83 static int
  84 __uci_to_blob(struct blob_buf *b, struct uci_section *s,
  85               const struct uci_blob_param_list *p)
  86 {
  87         const struct blobmsg_policy *attr = NULL;
  88         struct uci_element *e;
  89         struct uci_option *o;
  90         void *array;
  91         int i, ret = 0;
  92
  93         uci_foreach_element(&s->options, e) {
  94                 for (i = 0; i < p->n_params; i++) {
  95                         attr = &p->params[i];
  96                         if (!strcmp(attr->name, e->name))
  97                                 break;
  98                 }
  99
 100                 if (i == p->n_params)
 101                         continue;
 102
 103                 o = uci_to_option(e);
 104
 105                 if (attr->type == BLOBMSG_TYPE_ARRAY) {
 106                         if (!p->info)
 107                                 continue;
 108
 109                         array = blobmsg_open_array(b, attr->name);
 110                         uci_array_to_blob(b, o, p->info[i].type);
 111                         blobmsg_close_array(b, array);
 112                         ret++;
 113                         continue;
 114                 }
 115
 116                 if (o->type == UCI_TYPE_LIST)
 117                         continue;
 118
 119                 ret += uci_attr_to_blob(b, o->v.string, attr->name, attr->type);
 120         }
 121
 122         return ret;
 123 }
 124
 125 int
 126 uci_to_blob(struct blob_buf *b, struct uci_section *s,
 127             const struct uci_blob_param_list *p)
 128 {
 129         int ret = 0;
 130         int i;
 131
 132         ret += __uci_to_blob(b, s, p);
 133         for (i = 0; i < p->n_next; i++)
 134                 ret += uci_to_blob(b, s, p->next[i]);
 135
 136         return ret;
 137 }
 138
 139 bool
 140 uci_blob_diff(struct blob_attr **tb1, struct blob_attr **tb2,
 141               const struct uci_blob_param_list *config, unsigned long *diff)
 142 {
 143         bool ret = false;
 144         int i;
 145
 146         for (i = 0; i < config->n_params; i++) {
 147                 if (!tb1[i] && !tb2[i])
 148                         continue;
 149
 150                 if (!!tb1[i] != !!tb2[i])
 151                         goto mark;
 152
 153                 if (blob_len(tb1[i]) != blob_len(tb2[i]))
 154                         goto mark;
 155
 156                 if (memcmp(tb1[i], tb2[i], blob_raw_len(tb1[i])) != 0)
 157                         goto mark;
 158
 159                 continue;
 160
 161 mark:
 162                 ret = true;
 163                 if (diff)
 164                         bitfield_set(diff, i);
 165                 else
 166                         return ret;
 167         }
 168
 169         return ret;
 170 }
 171
 172
 173 static bool
 174 __uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 175                        const struct uci_blob_param_list *config)
 176 {
 177         struct blob_attr **tb1, **tb2;
 178
 179         if (!!c1 ^ !!c2)
 180                 return false;
 181
 182         if (!c1 && !c2)
 183                 return true;
 184
 185         tb1 = alloca(config->n_params * sizeof(struct blob_attr *));
 186         blobmsg_parse(config->params, config->n_params, tb1,
 187                 blob_data(c1), blob_len(c1));
 188
 189         tb2 = alloca(config->n_params * sizeof(struct blob_attr *));
 190         blobmsg_parse(config->params, config->n_params, tb2,
 191                 blob_data(c2), blob_len(c2));
 192
 193         return !uci_blob_diff(tb1, tb2, config, NULL);
 194 }
 195
 196 bool
 197 uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 198                      const struct uci_blob_param_list *config)
 199 {
 200         int i;
 201
 202         if (!__uci_blob_check_equal(c1, c2, config))
 203                 return false;
 204
 205         for (i = 0; i < config->n_next; i++) {
 206                 if (!__uci_blob_check_equal(c1, c2, config->next[i]))
 207                         return false;
 208         }
 209
 210         return true;
 211 }