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socket_zep: send dummy HELLO packet on connect

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This commit is contained in:
Benjamin Valentin 2020-10-29 18:37:05 +01:00
parent 54eedd94ba
commit 90f3c15084
3 changed files with 56 additions and 1 deletions
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33
cpu/native/include/socket_zep.h
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@ -13,6 +13,39 @@
*
* @see @ref net_zep for protocol definitions
*
* This ZEP implementation can send a dummy HELLO packet on startup.
* This is used to make dispatchers aware of the node.
* To enable this behavior, add
*
* ```
* USEMODULE += socket_zep_hello
* ```
*
* to your Makefile.
*
* A ZEP dispatcher can just drop those packets (ZEP type 0xFF) if it
* chooses to parse the ZEP header.
*
* The header of the HELLO packet will look like this:
*
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Preamble (EX) | Version (2) | Type (255) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* + +
* | |
* + Reserved (0) +
* | |
* + +
* | |
* + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | 'H' | 'E' | 'L' |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | 'L' | 'O' | 0 | 0 |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | 0 | 0 | 0 | 0 |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* @{
*
* @file

23
cpu/native/socket_zep/socket_zep.c
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@ -40,6 +40,9 @@
* (https://pubs.opengroup.org/onlinepubs/9699919799.2016edition/basedefs/time.h.html) */
#define TV_USEC_PER_SEC (1000000L)
/* dummy packet to register with ZEP dispatcher */
#define SOCKET_ZEP_V2_TYPE_HELLO (255)
static size_t _zep_hdr_fill_v2_data(socket_zep_t *dev, zep_v2_data_hdr_t *hdr,
size_t payload_len)
{
@ -390,6 +393,21 @@ static int _connect_remote(socket_zep_t *dev, const socket_zep_params_t *params)
return res;
}
static void _send_zep_hello(socket_zep_t *dev)
{
if (IS_USED(MODULE_SOCKET_ZEP_HELLO)) {
/* dummy packet */
zep_v2_data_hdr_t hdr = {
.hdr.preamble = "EX",
.hdr.version = 2,
.type = SOCKET_ZEP_V2_TYPE_HELLO,
.resv = "HELLO",
};
real_write(dev->sock_fd, &hdr, sizeof(hdr));
}
}
void socket_zep_setup(socket_zep_t *dev, const socket_zep_params_t *params)
{
int res;
@ -408,7 +426,10 @@ void socket_zep_setup(socket_zep_t *dev, const socket_zep_params_t *params)
dev->sock_fd = res;
}
_connect_remote(dev, params);
if (_connect_remote(dev, params) == 0) {
/* send dummy data to connect to dispatcher */
_send_zep_hello(dev);
}
/* generate hardware address from local address */
uint8_t ss_array[sizeof(struct sockaddr_storage)] = { 0 };

1
makefiles/pseudomodules.inc.mk
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@ -116,6 +116,7 @@ PSEUDOMODULES += sock_dtls
PSEUDOMODULES += sock_ip
PSEUDOMODULES += sock_tcp
PSEUDOMODULES += sock_udp
PSEUDOMODULES += socket_zep_hello
PSEUDOMODULES += soft_uart_modecfg
PSEUDOMODULES += stdin
PSEUDOMODULES += stdio_cdc_acm