262 lines
7.2 KiB
C
262 lines
7.2 KiB
C
/**
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* @file netmask.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* Synopsis:
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* ipv4_prefix_to_mask(string prefix)
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*
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* Variables:
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* string (empty) - prefix, converted to dotted decimal format without leading
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* zeros
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*
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* Synopsis:
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* ipv4_mask_to_prefix(string mask)
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*
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* Variables:
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* string (empty) - mask, converted to prefix length
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*
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* Synopsis:
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* ipv4_net_from_addr_and_prefix(string addr, string prefix)
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*
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* Variables:
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* string (empty) - network part of the address, according to given prefix
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* length, in dotted decimal format without leading zeros
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <inttypes.h>
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#include <misc/ipaddr.h>
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#include <misc/parse_number.h>
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#include <ncd/module_common.h>
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#include <generated/blog_channel_ncd_netmask.h>
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struct addr_instance {
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NCDModuleInst *i;
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uint32_t addr;
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};
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struct prefix_instance {
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NCDModuleInst *i;
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int prefix;
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};
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static void addr_func_init_templ (void *vo, NCDModuleInst *i, uint32_t addr)
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{
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struct addr_instance *o = vo;
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o->i = i;
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// remember address
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o->addr = addr;
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// signal up
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NCDModuleInst_Backend_Up(i);
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}
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static void prefix_to_mask_func_init (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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// read arguments
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NCDValRef prefix_arg;
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if (!NCDVal_ListRead(params->args, 1, &prefix_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(prefix_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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// parse prefix
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int prefix;
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if (!ipaddr_parse_ipv4_prefix(NCDVal_StringMemRef(prefix_arg), &prefix)) {
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ModuleLog(i, BLOG_ERROR, "bad prefix");
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goto fail0;
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}
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// make mask
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uint32_t mask = ipaddr_ipv4_mask_from_prefix(prefix);
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addr_func_init_templ(vo, i, mask);
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return;
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static void ipv4_net_from_addr_and_prefix_func_init (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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// read arguments
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NCDValRef addr_arg;
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NCDValRef prefix_arg;
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if (!NCDVal_ListRead(params->args, 2, &addr_arg, &prefix_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(addr_arg) || !NCDVal_IsString(prefix_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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// parse addr
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uint32_t addr;
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if (!ipaddr_parse_ipv4_addr(NCDVal_StringMemRef(addr_arg), &addr)) {
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ModuleLog(i, BLOG_ERROR, "bad addr");
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goto fail0;
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}
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// parse prefix
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int prefix;
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if (!ipaddr_parse_ipv4_prefix(NCDVal_StringMemRef(prefix_arg), &prefix)) {
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ModuleLog(i, BLOG_ERROR, "bad prefix");
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goto fail0;
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}
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// make network
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uint32_t network = (addr & ipaddr_ipv4_mask_from_prefix(prefix));
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addr_func_init_templ(vo, i, network);
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return;
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static void addr_func_die (void *vo)
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{
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struct addr_instance *o = vo;
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NCDModuleInst_Backend_Dead(o->i);
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}
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static int addr_func_getvar2 (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out)
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{
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struct addr_instance *o = vo;
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if (name == NCD_STRING_EMPTY) {
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char buf[IPADDR_PRINT_MAX];
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ipaddr_print_addr(o->addr, buf);
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*out = NCDVal_NewString(mem, buf);
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return 1;
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}
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return 0;
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}
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static void mask_to_prefix_func_init (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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struct prefix_instance *o = vo;
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o->i = i;
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// read arguments
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NCDValRef mask_arg;
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if (!NCDVal_ListRead(params->args, 1, &mask_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(mask_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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// parse mask
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uint32_t mask;
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if (!ipaddr_parse_ipv4_addr(NCDVal_StringMemRef(mask_arg), &mask)) {
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ModuleLog(i, BLOG_ERROR, "bad mask");
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goto fail0;
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}
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// build prefix
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if (!ipaddr_ipv4_prefix_from_mask(mask, &o->prefix)) {
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ModuleLog(i, BLOG_ERROR, "bad mask");
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goto fail0;
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}
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// signal up
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NCDModuleInst_Backend_Up(i);
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return;
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static void prefix_func_die (void *vo)
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{
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struct prefix_instance *o = vo;
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NCDModuleInst_Backend_Dead(o->i);
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}
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static int prefix_func_getvar2 (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out)
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{
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struct prefix_instance *o = vo;
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if (name == NCD_STRING_EMPTY) {
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char buf[6];
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sprintf(buf, "%d", o->prefix);
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*out = NCDVal_NewString(mem, buf);
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return 1;
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}
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return 0;
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}
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static struct NCDModule modules[] = {
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{
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.type = "ipv4_prefix_to_mask",
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.func_new2 = prefix_to_mask_func_init,
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.func_die = addr_func_die,
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.func_getvar2 = addr_func_getvar2,
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.alloc_size = sizeof(struct addr_instance)
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}, {
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.type = "ipv4_mask_to_prefix",
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.func_new2 = mask_to_prefix_func_init,
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.func_die = prefix_func_die,
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.func_getvar2 = prefix_func_getvar2,
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.alloc_size = sizeof(struct prefix_instance)
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}, {
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.type = "ipv4_net_from_addr_and_prefix",
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.func_new2 = ipv4_net_from_addr_and_prefix_func_init,
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.func_die = addr_func_die,
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.func_getvar2 = addr_func_getvar2,
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.alloc_size = sizeof(struct addr_instance)
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}, {
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.type = NULL
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}
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};
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const struct NCDModuleGroup ncdmodule_netmask = {
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.modules = modules
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};
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