/* function: subnet_from_interface
* finds the ipv6 subnet configured on the specified interface
* root - parsed configuration
* interface - network interface name
*/
int subnet_from_interface(cnode *root, const char *interface) {
union anyip *interface_ip;
if(!config_item_ip6(root, "ipv6_host_id", "::200:5E10:0:0", &Global_Clatd_Config.ipv6_host_id))
return 0;
interface_ip = getinterface_ip(interface, AF_INET6);
if(!interface_ip) {
logmsg(ANDROID_LOG_FATAL,"unable to find an ipv6 ip on interface %s",interface);
return 0;
}
memcpy(&Global_Clatd_Config.ipv6_local_subnet, &interface_ip->ip6, sizeof(struct in6_addr));
free(interface_ip);
config_generate_local_ipv6_subnet(&Global_Clatd_Config.ipv6_local_subnet);
return 1;
}
/* function: subnet_from_interface
* finds the ipv6 subnet configured on the specified interface
* root - parsed configuration
* interface - network interface name
*/
int subnet_from_interface(cnode *root, const char *interface) {
union anyip *interface_ip;
char prop_name[PROPERTY_KEY_MAX];
char prop_value[PROPERTY_VALUE_MAX];
int cnt = 10;
if(!config_item_ip6(root, "ipv6_host_id", "::200:5E10:0:0", &Global_Clatd_Config.ipv6_host_id))
return 0;
logmsg(ANDROID_LOG_INFO, "before get net.ipv6.prefix");
snprintf(prop_name, sizeof(prop_name), "net.ipv6.%s.prefix", interface);
while(cnt-->0)
{
property_get(prop_name, prop_value, NULL);
if (strcmp(prop_value, ""))
{
break;
}
sleep(1);
}
logmsg(ANDROID_LOG_INFO, "after get net.ipv6.prefix");
interface_ip = getinterface_ip(interface, AF_INET6);
if(!interface_ip) {
logmsg(ANDROID_LOG_FATAL,"unable to find an ipv6 ip on interface %s",interface);
return 0;
}
memcpy(&Global_Clatd_Config.ipv6_local_subnet, &interface_ip->ip6, sizeof(struct in6_addr));
free(interface_ip);
config_generate_local_ipv6_subnet(&Global_Clatd_Config.ipv6_local_subnet);
return 1;
}
/* function: read_config
* reads the config file and parses it into the global variable Global_Clatd_Config. returns 0 on failure, 1 on success
* file - filename to parse
* uplink_interface - interface to use to reach the internet and supplier of address space
* plat_prefix - (optional) plat prefix to use, otherwise follow config file
*/
int read_config(const char *file, const char *uplink_interface, const char *plat_prefix) {
cnode *root = config_node("", "");
void *tmp_ptr = NULL;
if(!root) {
logmsg(ANDROID_LOG_FATAL,"out of memory");
return 0;
}
memset(&Global_Clatd_Config, '\0', sizeof(Global_Clatd_Config));
config_load_file(root, file);
if(root->first_child == NULL) {
logmsg(ANDROID_LOG_FATAL,"Could not read config file %s", file);
goto failed;
}
strncpy(Global_Clatd_Config.default_pdp_interface, uplink_interface, sizeof(Global_Clatd_Config.default_pdp_interface));
if(!subnet_from_interface(root,Global_Clatd_Config.default_pdp_interface))
goto failed;
if(!config_item_int16_t(root, "mtu", "-1", &Global_Clatd_Config.mtu))
goto failed;
if(!config_item_int16_t(root, "ipv4mtu", "-1", &Global_Clatd_Config.ipv4mtu))
goto failed;
if(!config_item_ip(root, "ipv4_local_subnet", DEFAULT_IPV4_LOCAL_SUBNET, &Global_Clatd_Config.ipv4_local_subnet))
goto failed;
if(!config_item_ip6(root, "ipv6_local_address", DEFAULT_IPV6_LOCAL_ADDRESS, &Global_Clatd_Config.ipv6_local_address))
goto failed;
if(plat_prefix) { // plat subnet is coming from the command line
if(inet_pton(AF_INET6, plat_prefix, &Global_Clatd_Config.plat_subnet) <= 0) {
logmsg(ANDROID_LOG_FATAL,"invalid IPv6 address specified for plat prefix: %s", plat_prefix);
goto failed;
}
} else {
tmp_ptr = (void *)config_item_str(root, "plat_from_dns64", "yes");
if(!tmp_ptr || strcmp(tmp_ptr, "no") == 0) {
free(tmp_ptr);
if(!config_item_ip6(root, "plat_subnet", NULL, &Global_Clatd_Config.plat_subnet)) {
logmsg(ANDROID_LOG_FATAL, "plat_from_dns64 disabled, but no plat_subnet specified");
goto failed;
}
} else {
free(tmp_ptr);
if(!(Global_Clatd_Config.plat_from_dns64_hostname = config_item_str(root, "plat_from_dns64_hostname", DEFAULT_DNS64_DETECTION_HOSTNAME)))
goto failed;
dns64_detection();
}
}
return 1;
failed:
free(root);
free_config();
return 0;
}
