tor-android/external/badvpn_dns/ncd/modules/net_ipv6_addr.c

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2015-01-25 11:08:34 +00:00
/**
* @file net_ipv6_addr.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
*
* IPv6 address module.
*
* Synopsis:
* net.ipv6.addr(string ifname, string addr, string prefix)
* net.ipv6.addr(string ifname, string cidr_addr)
*
* Description:
* Adds the given address to the given network interface on initialization,
* and removes it on deinitialization. The second form takes the address and
* prefix in CIDR notation (a.b.c.d/n).
*/
#include <stdlib.h>
#include <string.h>
#include <ncd/NCDModule.h>
#include <ncd/extra/NCDIfConfig.h>
#include <generated/blog_channel_ncd_net_ipv6_addr.h>
#define ModuleLog(i, ...) NCDModuleInst_Backend_Log((i), BLOG_CURRENT_CHANNEL, __VA_ARGS__)
struct instance {
NCDModuleInst *i;
NCDValNullTermString ifname_nts;
struct ipv6_ifaddr ifaddr;
};
static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
{
struct instance *o = vo;
o->i = i;
// read arguments
NCDValRef ifname_arg;
NCDValRef addr_arg;
NCDValRef prefix_arg = NCDVal_NewInvalid();
if (!NCDVal_ListRead(params->args, 2, &ifname_arg, &addr_arg) &&
!NCDVal_ListRead(params->args, 3, &ifname_arg, &addr_arg, &prefix_arg)
) {
ModuleLog(o->i, BLOG_ERROR, "wrong arity");
goto fail0;
}
if (!NCDVal_IsStringNoNulls(ifname_arg) || !NCDVal_IsString(addr_arg) ||
(!NCDVal_IsInvalid(prefix_arg) && !NCDVal_IsString(prefix_arg))
) {
ModuleLog(o->i, BLOG_ERROR, "wrong type");
goto fail0;
}
// null terminate ifname
if (!NCDVal_StringNullTerminate(ifname_arg, &o->ifname_nts)) {
ModuleLog(i, BLOG_ERROR, "NCDVal_StringNullTerminate failed");
goto fail0;
}
if (NCDVal_IsInvalid(prefix_arg)) {
if (!ipaddr6_parse_ipv6_ifaddr_bin(NCDVal_StringData(addr_arg), NCDVal_StringLength(addr_arg), &o->ifaddr)) {
ModuleLog(o->i, BLOG_ERROR, "wrong CIDR notation address");
goto fail1;
}
} else {
if (!ipaddr6_parse_ipv6_addr_bin(NCDVal_StringData(addr_arg), NCDVal_StringLength(addr_arg), &o->ifaddr.addr)) {
ModuleLog(o->i, BLOG_ERROR, "wrong address");
goto fail1;
}
if (!ipaddr6_parse_ipv6_prefix_bin(NCDVal_StringData(prefix_arg), NCDVal_StringLength(prefix_arg), &o->ifaddr.prefix)) {
ModuleLog(o->i, BLOG_ERROR, "wrong prefix");
goto fail1;
}
}
// add address
if (!NCDIfConfig_add_ipv6_addr(o->ifname_nts.data, o->ifaddr)) {
ModuleLog(o->i, BLOG_ERROR, "failed to add IP address");
goto fail1;
}
// signal up
NCDModuleInst_Backend_Up(o->i);
return;
fail1:
NCDValNullTermString_Free(&o->ifname_nts);
fail0:
NCDModuleInst_Backend_DeadError(i);
}
static void func_die (void *vo)
{
struct instance *o = vo;
// remove address
if (!NCDIfConfig_remove_ipv6_addr(o->ifname_nts.data, o->ifaddr)) {
ModuleLog(o->i, BLOG_ERROR, "failed to remove IP address");
}
// free ifname nts
NCDValNullTermString_Free(&o->ifname_nts);
NCDModuleInst_Backend_Dead(o->i);
}
static struct NCDModule modules[] = {
{
.type = "net.ipv6.addr",
.func_new2 = func_new,
.func_die = func_die,
.alloc_size = sizeof(struct instance)
}, {
.type = NULL
}
};
const struct NCDModuleGroup ncdmodule_net_ipv6_addr = {
.modules = modules
};