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This option allows users to suspend execution of the cloud-init provisioning until a valid network is detected. This detection is currently done through requesting a DNS lookup for one of the Clear Linux NTP service IP addresses (this is a RR record, we don't actually look at the result). This lookup is not infinite. After 5 minutes, the wait exits no matter what even if there is no network detected. The option can be provided manually. `packages` and `package_upgrade` options *imply* this option, but one can explicitly disable the wait by providing it early in the cloud-config file with a value of `false`. The wait routing is active - it will retry relatively quickly to detect an active connection. Any failure will result in another retry. In a fully private network without public DNS, this will not work. The DNS hostname used for testing can be manipulated through the `-with-dnstestaddr=<hostname>` configure flag. You shouldn't put an IP address in here, since that fully disables any network testing.
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| /*** | ||
| Copyright © 2019 Intel Corporation | ||
| Author: Auke-jan H. Kok <[email protected]> | ||
| This file is part of micro-config-drive. | ||
| micro-config-drive is free software: you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation, either version 3 of the License, or | ||
| (at your option) any later version. | ||
| micro-config-drive is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with micro-config-drive. If not, see <http://www.gnu.org/licenses/>. | ||
| In addition, as a special exception, the copyright holders give | ||
| permission to link the code of portions of this program with the | ||
| OpenSSL library under certain conditions as described in each | ||
| individual source file, and distribute linked combinations | ||
| including the two. | ||
| You must obey the GNU General Public License in all respects | ||
| for all of the code used other than OpenSSL. If you modify | ||
| file(s) with this exception, you may extend this exception to your | ||
| version of the file(s), but you are not obligated to do so. If you | ||
| do not wish to do so, delete this exception statement from your | ||
| version. If you delete this exception statement from all source | ||
| files in the program, then also delete it here. | ||
| ***/ | ||
|
|
||
| #include <stdbool.h> | ||
| #include <stdio.h> | ||
| #include <netdb.h> | ||
| #include <unistd.h> | ||
|
|
||
| #include <glib.h> | ||
|
|
||
| #include "handlers.h" | ||
| #include "cloud_config.h" | ||
| #include "lib.h" | ||
|
|
||
| #define MOD "package_upgrade: " | ||
|
|
||
| static int do_network_wait = -1; | ||
| // -1: default: unset | ||
| // 0: don't wait | ||
| // 1: wait | ||
| // 2: wait already happened | ||
|
|
||
| void wait_for_network(void) { | ||
| if (do_network_wait == 1) { | ||
| struct hostent *he = NULL; | ||
| useconds_t slept = 0; | ||
| useconds_t times = 0; | ||
|
|
||
| // don't re-enter | ||
| do_network_wait = 2; | ||
|
|
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| memset(he, 0, sizeof(struct hostent)); | ||
| LOG(MOD "Waiting for an active network connection.\n"); | ||
| for (;;) { | ||
| he = gethostbyname(DNSTESTADDR); | ||
| if (he) { | ||
| LOG(MOD "Network appears active, waiting completed.\n"); | ||
| break; | ||
| } | ||
| times = times < 10 ? times + 1 : times; | ||
| slept += times; | ||
| if (slept > 3000) { | ||
| LOG(MOD "Waited for network for 5 minutes, no answer - giving up.\n"); | ||
| break; | ||
| } | ||
| usleep(times * 100000); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| void wait_for_network_handler(GNode *node) { | ||
| bool do_wait; | ||
|
|
||
| LOG(MOD "Wait System Software Update Handler running...\n"); | ||
| GNode* val = g_node_first_child(node); | ||
| if (!val) { | ||
| LOG(MOD "Corrupt userdata!\n"); | ||
| return; | ||
| } | ||
| if (!cloud_config_bool(val, &do_wait)) { | ||
| return; | ||
| } | ||
|
|
||
| if (do_wait) { | ||
| do_network_wait = 1; | ||
| wait_for_network(); | ||
| } else { | ||
| do_network_wait = 0; | ||
| LOG(MOD "Disabling network wait.\n"); | ||
| } | ||
| } | ||
|
|
||
| struct cc_module_handler_struct wait_for_network_cc_module = { | ||
| .name = "wait_for_network", | ||
| .handler = &wait_for_network_handler | ||
| }; |
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