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_element_to_blob(struct blob_buf *b, struct uci_element *e,
  85                       const struct uci_blob_param_list *p)
  86 {
  87         const struct blobmsg_policy *attr = NULL;
  88         struct uci_option *o = uci_to_option(e);
  89         unsigned int types = 0;
  90         void *array;
  91         int i, ret = 0;
  92
  93         for (i = 0; i < p->n_params; i++) {
  94                 attr = &p->params[i];
  95
  96                 if (strcmp(attr->name, e->name) != 0)
  97                         continue;
  98
  99                 if (attr->type > BLOBMSG_TYPE_LAST)
 100                         continue;
 101
 102                 if (types & (1 << attr->type))
 103                         continue;
 104
 105                 types |= 1 << attr->type;
 106
 107                 if (attr->type == BLOBMSG_TYPE_ARRAY) {
 108                         int element_type = 0;
 109
 110                         if (p->info)
 111                                 element_type = p->info[i].type;
 112
 113                         if (!element_type)
 114                                 element_type = BLOBMSG_TYPE_STRING;
 115
 116                         array = blobmsg_open_array(b, attr->name);
 117                         uci_array_to_blob(b, o, element_type);
 118                         blobmsg_close_array(b, array);
 119                         ret++;
 120                         continue;
 121                 }
 122
 123                 if (o->type == UCI_TYPE_LIST)
 124                         continue;
 125
 126                 ret += uci_attr_to_blob(b, o->v.string, attr->name, attr->type);
 127         }
 128         return ret;
 129 }
 130
 131 static int
 132 __uci_to_blob(struct blob_buf *b, struct uci_section *s,
 133               const struct uci_blob_param_list *p)
 134 {
 135         struct uci_element *e;
 136         int ret = 0;
 137
 138         uci_foreach_element(&s->options, e)
 139                 ret += __uci_element_to_blob(b, e, p);
 140
 141         return ret;
 142 }
 143
 144 int
 145 uci_to_blob(struct blob_buf *b, struct uci_section *s,
 146             const struct uci_blob_param_list *p)
 147 {
 148         int ret = 0;
 149         int i;
 150
 151         ret += __uci_to_blob(b, s, p);
 152         for (i = 0; i < p->n_next; i++)
 153                 ret += uci_to_blob(b, s, p->next[i]);
 154
 155         return ret;
 156 }
 157
 158 bool
 159 uci_blob_diff(struct blob_attr **tb1, struct blob_attr **tb2,
 160               const struct uci_blob_param_list *config, unsigned long *diff)
 161 {
 162         bool ret = false;
 163         int i;
 164
 165         for (i = 0; i < config->n_params; i++) {
 166                 if (!tb1[i] && !tb2[i])
 167                         continue;
 168
 169                 if (!!tb1[i] != !!tb2[i])
 170                         goto mark;
 171
 172                 if (blob_len(tb1[i]) != blob_len(tb2[i]))
 173                         goto mark;
 174
 175                 if (memcmp(tb1[i], tb2[i], blob_raw_len(tb1[i])) != 0)
 176                         goto mark;
 177
 178                 continue;
 179
 180 mark:
 181                 ret = true;
 182                 if (diff)
 183                         bitfield_set(diff, i);
 184                 else
 185                         return ret;
 186         }
 187
 188         return ret;
 189 }
 190
 191
 192 static bool
 193 __uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 194                        const struct uci_blob_param_list *config)
 195 {
 196         struct blob_attr **tb1, **tb2;
 197
 198         if (!!c1 ^ !!c2)
 199                 return false;
 200
 201         if (!c1 && !c2)
 202                 return true;
 203
 204         tb1 = alloca(config->n_params * sizeof(struct blob_attr *));
 205         blobmsg_parse(config->params, config->n_params, tb1,
 206                 blob_data(c1), blob_len(c1));
 207
 208         tb2 = alloca(config->n_params * sizeof(struct blob_attr *));
 209         blobmsg_parse(config->params, config->n_params, tb2,
 210                 blob_data(c2), blob_len(c2));
 211
 212         return !uci_blob_diff(tb1, tb2, config, NULL);
 213 }
 214
 215 bool
 216 uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 217                      const struct uci_blob_param_list *config)
 218 {
 219         int i;
 220
 221         if (!__uci_blob_check_equal(c1, c2, config))
 222                 return false;
 223
 224         for (i = 0; i < config->n_next; i++) {
 225                 if (!__uci_blob_check_equal(c1, c2, config->next[i]))
 226                         return false;
 227         }
 228
 229         return true;
 230 }