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net: add set hostname function

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This commit adds a function to set the hostname on runtime.

Signed-off-by: Gerhard Jörges <joerges@metratec.com>
This commit is contained in:
Gerhard Jörges 2024-01-10 14:20:07 +01:00 committed by Carles Cufí
parent 98a631b5bc
commit 72a51c7ec4
3 changed files with 62 additions and 7 deletions
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31
include/zephyr/net/hostname.h
View file

@ -22,10 +22,16 @@ extern "C" {
* @{
*/
#define NET_HOSTNAME_MAX_LEN \
(sizeof(CONFIG_NET_HOSTNAME) - 1 + \
(IS_ENABLED(CONFIG_NET_HOSTNAME_UNIQUE) ? \
sizeof("0011223344556677") - 1 : 0))
#if defined(CONFIG_NET_HOSTNAME_MAX_LEN)
#define NET_HOSTNAME_MAX_LEN \
MAX(CONFIG_NET_HOSTNAME_MAX_LEN, \
(sizeof(CONFIG_NET_HOSTNAME) - 1 + \
(IS_ENABLED(CONFIG_NET_HOSTNAME_UNIQUE) ? sizeof("0011223344556677") - 1 : 0)))
#else
#define NET_HOSTNAME_MAX_LEN \
(sizeof(CONFIG_NET_HOSTNAME) - 1 + \
(IS_ENABLED(CONFIG_NET_HOSTNAME_UNIQUE) ? sizeof("0011223344556677") - 1 : 0))
#endif
#if defined(CONFIG_NET_HOSTNAME_ENABLE)
#define NET_HOSTNAME_SIZE NET_HOSTNAME_MAX_LEN + 1
@ -49,6 +55,23 @@ static inline const char *net_hostname_get(void)
}
#endif /* CONFIG_NET_HOSTNAME_ENABLE */
/**
* @brief Set the device hostname
*
* @param host new hostname as char array.
* @param len Length of the hostname array.
*
* @return 0 if ok, <0 on error
*/
#if defined(CONFIG_NET_HOSTNAME_DYNAMIC)
int net_hostname_set(char *host, size_t len);
#else
static inline int net_hostname_set(char *host, size_t len)
{
return -ENOTSUP;
}
#endif
/**
* @brief Initialize and set the device hostname.
*

17
subsys/net/Kconfig.hostname
View file

@ -17,10 +17,25 @@ config NET_HOSTNAME
help
The string should be a valid hostname.
config NET_HOSTNAME_DYNAMIC
bool "Allow the hostname to be set by the application"
depends on !NET_HOSTNAME_UNIQUE_UPDATE
help
This will enable the net_hostname_set() function. NET_HOSTNAME
will be used as default hostname.
config NET_HOSTNAME_MAX_LEN
int "The maximum allowed hostname length"
depends on NET_HOSTNAME_DYNAMIC
range 1 63
default 63
help
This will set the number of bytes allocateed for the hostname.
config NET_HOSTNAME_UNIQUE
bool "Make hostname unique"
help
This will append link address to hostname to create a unique
This will append link address to NET_HOSTNAME to create a unique
hostname. For example, zephyr00005e005357 could be the hostname
if this setting is enabled.

21
subsys/net/hostname.c
View file

@ -37,6 +37,23 @@ const char *net_hostname_get(void)
return hostname;
}
#if defined(CONFIG_NET_HOSTNAME_DYNAMIC)
int net_hostname_set(char *host, size_t len)
{
if (len > NET_HOSTNAME_MAX_LEN) {
return -ENOMEM;
}
memcpy(hostname, host, len);
hostname[len] = 0;
NET_DBG("New hostname %s", hostname);
trigger_net_event();
return 0;
}
#endif
#if defined(CONFIG_NET_HOSTNAME_UNIQUE)
int net_hostname_set_postfix(const uint8_t *hostname_postfix,
int postfix_len)
@ -62,8 +79,8 @@ int net_hostname_set_postfix(const uint8_t *hostname_postfix,
}
for (i = 0; i < postfix_len; i++, pos += 2) {
snprintk(&hostname[sizeof(CONFIG_NET_HOSTNAME) - 1 + pos],
2 + 1, "%02x", hostname_postfix[i]);
snprintk(&hostname[sizeof(CONFIG_NET_HOSTNAME) - 1 + pos], 2 + 1, "%02x",
hostname_postfix[i]);
}
NET_DBG("New hostname %s", hostname);