148 lines
4.7 KiB
C
148 lines
4.7 KiB
C
/**
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* @file net_ipv4_addr.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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* IPv4 address module.
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*
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* Synopsis:
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* net.ipv4.addr(string ifname, string addr, string prefix)
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* net.ipv4.addr(string ifname, string cidr_addr)
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*
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* Description:
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* Adds the given address to the given network interface on initialization,
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* and removes it on deinitialization. The second form takes the address and
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* prefix in CIDR notation (a.b.c.d/n).
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <ncd/extra/NCDIfConfig.h>
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#include <ncd/module_common.h>
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#include <generated/blog_channel_ncd_net_ipv4_addr.h>
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struct instance {
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NCDModuleInst *i;
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NCDValNullTermString ifname_nts;
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struct ipv4_ifaddr ifaddr;
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};
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static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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struct instance *o = vo;
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o->i = i;
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// read arguments
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NCDValRef ifname_arg;
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NCDValRef addr_arg;
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NCDValRef prefix_arg = NCDVal_NewInvalid();
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if (!NCDVal_ListRead(params->args, 2, &ifname_arg, &addr_arg) &&
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!NCDVal_ListRead(params->args, 3, &ifname_arg, &addr_arg, &prefix_arg)
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) {
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ModuleLog(o->i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsStringNoNulls(ifname_arg) || !NCDVal_IsString(addr_arg) ||
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(!NCDVal_IsInvalid(prefix_arg) && !NCDVal_IsString(prefix_arg))
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) {
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ModuleLog(o->i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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// null terminate ifname
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if (!NCDVal_StringNullTerminate(ifname_arg, &o->ifname_nts)) {
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ModuleLog(i, BLOG_ERROR, "NCDVal_StringNullTerminate failed");
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goto fail0;
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}
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if (NCDVal_IsInvalid(prefix_arg)) {
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if (!ipaddr_parse_ipv4_ifaddr(NCDVal_StringMemRef(addr_arg), &o->ifaddr)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong CIDR notation address");
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goto fail1;
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}
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} else {
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if (!ipaddr_parse_ipv4_addr(NCDVal_StringMemRef(addr_arg), &o->ifaddr.addr)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong address");
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goto fail1;
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}
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if (!ipaddr_parse_ipv4_prefix(NCDVal_StringMemRef(prefix_arg), &o->ifaddr.prefix)) {
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ModuleLog(o->i, BLOG_ERROR, "wrong prefix");
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goto fail1;
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}
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}
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// add address
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if (!NCDIfConfig_add_ipv4_addr(o->ifname_nts.data, o->ifaddr)) {
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ModuleLog(o->i, BLOG_ERROR, "failed to add IP address");
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goto fail1;
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}
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// signal up
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NCDModuleInst_Backend_Up(o->i);
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return;
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fail1:
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NCDValNullTermString_Free(&o->ifname_nts);
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static void func_die (void *vo)
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{
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struct instance *o = vo;
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// remove address
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if (!NCDIfConfig_remove_ipv4_addr(o->ifname_nts.data, o->ifaddr)) {
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ModuleLog(o->i, BLOG_ERROR, "failed to remove IP address");
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}
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// free ifname nts
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NCDValNullTermString_Free(&o->ifname_nts);
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NCDModuleInst_Backend_Dead(o->i);
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}
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static struct NCDModule modules[] = {
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{
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.type = "net.ipv4.addr",
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.func_new2 = func_new,
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.func_die = func_die,
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.alloc_size = sizeof(struct 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_net_ipv4_addr = {
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.modules = modules
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};
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