264 lines
7.4 KiB
C
264 lines
7.4 KiB
C
/**
|
|
* @file netmask.c
|
|
* @author Ambroz Bizjak <ambrop7@gmail.com>
|
|
*
|
|
* @section LICENSE
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the author nor the
|
|
* names of its contributors may be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* @section DESCRIPTION
|
|
*
|
|
* Synopsis:
|
|
* ipv4_prefix_to_mask(string prefix)
|
|
*
|
|
* Variables:
|
|
* string (empty) - prefix, converted to dotted decimal format without leading
|
|
* zeros
|
|
*
|
|
* Synopsis:
|
|
* ipv4_mask_to_prefix(string mask)
|
|
*
|
|
* Variables:
|
|
* string (empty) - mask, converted to prefix length
|
|
*
|
|
* Synopsis:
|
|
* ipv4_net_from_addr_and_prefix(string addr, string prefix)
|
|
*
|
|
* Variables:
|
|
* string (empty) - network part of the address, according to given prefix
|
|
* length, in dotted decimal format without leading zeros
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <inttypes.h>
|
|
|
|
#include <misc/ipaddr.h>
|
|
#include <misc/parse_number.h>
|
|
#include <ncd/NCDModule.h>
|
|
#include <ncd/static_strings.h>
|
|
|
|
#include <generated/blog_channel_ncd_netmask.h>
|
|
|
|
#define ModuleLog(i, ...) NCDModuleInst_Backend_Log((i), BLOG_CURRENT_CHANNEL, __VA_ARGS__)
|
|
|
|
struct addr_instance {
|
|
NCDModuleInst *i;
|
|
uint32_t addr;
|
|
};
|
|
|
|
struct prefix_instance {
|
|
NCDModuleInst *i;
|
|
int prefix;
|
|
};
|
|
|
|
static void addr_func_init_templ (void *vo, NCDModuleInst *i, uint32_t addr)
|
|
{
|
|
struct addr_instance *o = vo;
|
|
o->i = i;
|
|
|
|
// remember address
|
|
o->addr = addr;
|
|
|
|
// signal up
|
|
NCDModuleInst_Backend_Up(i);
|
|
}
|
|
|
|
static void prefix_to_mask_func_init (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
|
|
{
|
|
// read arguments
|
|
NCDValRef prefix_arg;
|
|
if (!NCDVal_ListRead(params->args, 1, &prefix_arg)) {
|
|
ModuleLog(i, BLOG_ERROR, "wrong arity");
|
|
goto fail0;
|
|
}
|
|
if (!NCDVal_IsString(prefix_arg)) {
|
|
ModuleLog(i, BLOG_ERROR, "wrong type");
|
|
goto fail0;
|
|
}
|
|
|
|
// parse prefix
|
|
int prefix;
|
|
if (!ipaddr_parse_ipv4_prefix_bin((char *)NCDVal_StringData(prefix_arg), NCDVal_StringLength(prefix_arg), &prefix)) {
|
|
ModuleLog(i, BLOG_ERROR, "bad prefix");
|
|
goto fail0;
|
|
}
|
|
|
|
// make mask
|
|
uint32_t mask = ipaddr_ipv4_mask_from_prefix(prefix);
|
|
|
|
addr_func_init_templ(vo, i, mask);
|
|
return;
|
|
|
|
fail0:
|
|
NCDModuleInst_Backend_DeadError(i);
|
|
}
|
|
|
|
static void ipv4_net_from_addr_and_prefix_func_init (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
|
|
{
|
|
// read arguments
|
|
NCDValRef addr_arg;
|
|
NCDValRef prefix_arg;
|
|
if (!NCDVal_ListRead(params->args, 2, &addr_arg, &prefix_arg)) {
|
|
ModuleLog(i, BLOG_ERROR, "wrong arity");
|
|
goto fail0;
|
|
}
|
|
if (!NCDVal_IsString(addr_arg) || !NCDVal_IsString(prefix_arg)) {
|
|
ModuleLog(i, BLOG_ERROR, "wrong type");
|
|
goto fail0;
|
|
}
|
|
|
|
// parse addr
|
|
uint32_t addr;
|
|
if (!ipaddr_parse_ipv4_addr_bin((char *)NCDVal_StringData(addr_arg), NCDVal_StringLength(addr_arg), &addr)) {
|
|
ModuleLog(i, BLOG_ERROR, "bad addr");
|
|
goto fail0;
|
|
}
|
|
|
|
// parse prefix
|
|
int prefix;
|
|
if (!ipaddr_parse_ipv4_prefix_bin((char *)NCDVal_StringData(prefix_arg), NCDVal_StringLength(prefix_arg), &prefix)) {
|
|
ModuleLog(i, BLOG_ERROR, "bad prefix");
|
|
goto fail0;
|
|
}
|
|
|
|
// make network
|
|
uint32_t network = (addr & ipaddr_ipv4_mask_from_prefix(prefix));
|
|
|
|
addr_func_init_templ(vo, i, network);
|
|
return;
|
|
|
|
fail0:
|
|
NCDModuleInst_Backend_DeadError(i);
|
|
}
|
|
|
|
static void addr_func_die (void *vo)
|
|
{
|
|
struct addr_instance *o = vo;
|
|
|
|
NCDModuleInst_Backend_Dead(o->i);
|
|
}
|
|
|
|
static int addr_func_getvar2 (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out)
|
|
{
|
|
struct addr_instance *o = vo;
|
|
|
|
if (name == NCD_STRING_EMPTY) {
|
|
char buf[IPADDR_PRINT_MAX];
|
|
ipaddr_print_addr(o->addr, buf);
|
|
|
|
*out = NCDVal_NewString(mem, buf);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mask_to_prefix_func_init (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
|
|
{
|
|
struct prefix_instance *o = vo;
|
|
o->i = i;
|
|
|
|
// read arguments
|
|
NCDValRef mask_arg;
|
|
if (!NCDVal_ListRead(params->args, 1, &mask_arg)) {
|
|
ModuleLog(i, BLOG_ERROR, "wrong arity");
|
|
goto fail0;
|
|
}
|
|
if (!NCDVal_IsString(mask_arg)) {
|
|
ModuleLog(i, BLOG_ERROR, "wrong type");
|
|
goto fail0;
|
|
}
|
|
|
|
// parse mask
|
|
uint32_t mask;
|
|
if (!ipaddr_parse_ipv4_addr_bin((char *)NCDVal_StringData(mask_arg), NCDVal_StringLength(mask_arg), &mask)) {
|
|
ModuleLog(i, BLOG_ERROR, "bad mask");
|
|
goto fail0;
|
|
}
|
|
|
|
// build prefix
|
|
if (!ipaddr_ipv4_prefix_from_mask(mask, &o->prefix)) {
|
|
ModuleLog(i, BLOG_ERROR, "bad mask");
|
|
goto fail0;
|
|
}
|
|
|
|
// signal up
|
|
NCDModuleInst_Backend_Up(i);
|
|
return;
|
|
|
|
fail0:
|
|
NCDModuleInst_Backend_DeadError(i);
|
|
}
|
|
|
|
static void prefix_func_die (void *vo)
|
|
{
|
|
struct prefix_instance *o = vo;
|
|
|
|
NCDModuleInst_Backend_Dead(o->i);
|
|
}
|
|
|
|
static int prefix_func_getvar2 (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out)
|
|
{
|
|
struct prefix_instance *o = vo;
|
|
|
|
if (name == NCD_STRING_EMPTY) {
|
|
char buf[6];
|
|
sprintf(buf, "%d", o->prefix);
|
|
|
|
*out = NCDVal_NewString(mem, buf);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct NCDModule modules[] = {
|
|
{
|
|
.type = "ipv4_prefix_to_mask",
|
|
.func_new2 = prefix_to_mask_func_init,
|
|
.func_die = addr_func_die,
|
|
.func_getvar2 = addr_func_getvar2,
|
|
.alloc_size = sizeof(struct addr_instance)
|
|
}, {
|
|
.type = "ipv4_mask_to_prefix",
|
|
.func_new2 = mask_to_prefix_func_init,
|
|
.func_die = prefix_func_die,
|
|
.func_getvar2 = prefix_func_getvar2,
|
|
.alloc_size = sizeof(struct prefix_instance)
|
|
}, {
|
|
.type = "ipv4_net_from_addr_and_prefix",
|
|
.func_new2 = ipv4_net_from_addr_and_prefix_func_init,
|
|
.func_die = addr_func_die,
|
|
.func_getvar2 = addr_func_getvar2,
|
|
.alloc_size = sizeof(struct addr_instance)
|
|
}, {
|
|
.type = NULL
|
|
}
|
|
};
|
|
|
|
const struct NCDModuleGroup ncdmodule_netmask = {
|
|
.modules = modules
|
|
};
|