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         long long llval;
  29
  30         switch (type) {
  31         case BLOBMSG_TYPE_STRING:
  32                 blobmsg_add_string(b, name, str);
  33                 break;
  34         case BLOBMSG_TYPE_BOOL:
  35                 if (!strcmp(str, "true") || !strcmp(str, "1"))
  36                         intval = 1;
  37                 else if (!strcmp(str, "false") || !strcmp(str, "0"))
  38                         intval = 0;
  39                 else
  40                         return false;
  41
  42                 blobmsg_add_u8(b, name, intval);
  43                 break;
  44         case BLOBMSG_TYPE_INT32:
  45                 intval = strtol(str, &err, 0);
  46                 if (*err)
  47                         return false;
  48
  49                 blobmsg_add_u32(b, name, intval);
  50                 break;
  51         case BLOBMSG_TYPE_INT64:
  52                 llval = strtoll(str, &err, 0);
  53                 if (*err)
  54                         return false;
  55
  56                 blobmsg_add_u64(b, name, llval);
  57                 break;
  58         default:
  59                 return false;
  60         }
  61         return true;
  62 }
  63
  64 static void
  65 uci_array_to_blob(struct blob_buf *b, struct uci_option *o,
  66                   enum blobmsg_type type)
  67 {
  68         struct uci_element *e;
  69         char *str, *next, *word;
  70
  71         if (o->type == UCI_TYPE_LIST) {
  72                 uci_foreach_element(&o->v.list, e) {
  73                         uci_attr_to_blob(b, e->name, NULL, type);
  74                 }
  75                 return;
  76         }
  77
  78         str = strdup(o->v.string);
  79         next = str;
  80
  81         while ((word = strsep(&next, " \t")) != NULL) {
  82                 if (!*word)
  83                         continue;
  84
  85                 uci_attr_to_blob(b, word, NULL, type);
  86         }
  87
  88         free(str);
  89 }
  90
  91 static int
  92 __uci_element_to_blob(struct blob_buf *b, struct uci_element *e,
  93                       const struct uci_blob_param_list *p)
  94 {
  95         const struct blobmsg_policy *attr = NULL;
  96         struct uci_option *o = uci_to_option(e);
  97         unsigned int types = 0;
  98         void *array;
  99         int i, ret = 0;
 100
 101         for (i = 0; i < p->n_params; i++) {
 102                 attr = &p->params[i];
 103
 104                 if (strcmp(attr->name, e->name) != 0)
 105                         continue;
 106
 107                 if (attr->type > BLOBMSG_TYPE_LAST)
 108                         continue;
 109
 110                 if (types & (1 << attr->type))
 111                         continue;
 112
 113                 types |= 1 << attr->type;
 114
 115                 if (attr->type == BLOBMSG_TYPE_ARRAY) {
 116                         int element_type = 0;
 117
 118                         if (p->info)
 119                                 element_type = p->info[i].type;
 120
 121                         if (!element_type)
 122                                 element_type = BLOBMSG_TYPE_STRING;
 123
 124                         array = blobmsg_open_array(b, attr->name);
 125                         uci_array_to_blob(b, o, element_type);
 126                         blobmsg_close_array(b, array);
 127                         ret++;
 128                         continue;
 129                 }
 130
 131                 if (o->type == UCI_TYPE_LIST)
 132                         continue;
 133
 134                 ret += uci_attr_to_blob(b, o->v.string, attr->name, attr->type);
 135         }
 136         return ret;
 137 }
 138
 139 static int
 140 __uci_to_blob(struct blob_buf *b, struct uci_section *s,
 141               const struct uci_blob_param_list *p)
 142 {
 143         struct uci_element *e;
 144         int ret = 0;
 145
 146         uci_foreach_element(&s->options, e)
 147                 ret += __uci_element_to_blob(b, e, p);
 148
 149         return ret;
 150 }
 151
 152 int
 153 uci_to_blob(struct blob_buf *b, struct uci_section *s,
 154             const struct uci_blob_param_list *p)
 155 {
 156         int ret = 0;
 157         int i;
 158
 159         ret += __uci_to_blob(b, s, p);
 160         for (i = 0; i < p->n_next; i++)
 161                 ret += uci_to_blob(b, s, p->next[i]);
 162
 163         return ret;
 164 }
 165
 166 bool
 167 uci_blob_diff(struct blob_attr **tb1, struct blob_attr **tb2,
 168               const struct uci_blob_param_list *config, unsigned long *diff)
 169 {
 170         bool ret = false;
 171         int i;
 172
 173         for (i = 0; i < config->n_params; i++) {
 174                 if (!tb1[i] && !tb2[i])
 175                         continue;
 176
 177                 if (!!tb1[i] != !!tb2[i])
 178                         goto mark;
 179
 180                 if (blob_len(tb1[i]) != blob_len(tb2[i]))
 181                         goto mark;
 182
 183                 if (memcmp(tb1[i], tb2[i], blob_raw_len(tb1[i])) != 0)
 184                         goto mark;
 185
 186                 continue;
 187
 188 mark:
 189                 ret = true;
 190                 if (diff)
 191                         uci_bitfield_set(diff, i);
 192                 else
 193                         return ret;
 194         }
 195
 196         return ret;
 197 }
 198
 199
 200 static bool
 201 __uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 202                        const struct uci_blob_param_list *config)
 203 {
 204         struct blob_attr **tb1, **tb2;
 205
 206         if (!!c1 ^ !!c2)
 207                 return false;
 208
 209         if (!c1 && !c2)
 210                 return true;
 211
 212         tb1 = alloca(config->n_params * sizeof(struct blob_attr *));
 213         blobmsg_parse(config->params, config->n_params, tb1,
 214                 blob_data(c1), blob_len(c1));
 215
 216         tb2 = alloca(config->n_params * sizeof(struct blob_attr *));
 217         blobmsg_parse(config->params, config->n_params, tb2,
 218                 blob_data(c2), blob_len(c2));
 219
 220         return !uci_blob_diff(tb1, tb2, config, NULL);
 221 }
 222
 223 bool
 224 uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 225                      const struct uci_blob_param_list *config)
 226 {
 227         int i;
 228
 229         if (!__uci_blob_check_equal(c1, c2, config))
 230                 return false;
 231
 232         for (i = 0; i < config->n_next; i++) {
 233                 if (!__uci_blob_check_equal(c1, c2, config->next[i]))
 234                         return false;
 235         }
 236
 237         return true;
 238 }