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extmod/modnetwork: Increase max hostname length to 32.

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This changes from the previous limit of 15 characters.  Although DHCP and
mDNS allow for up to 63, ESP32 and ESP8266 only allow 32, so this seems
like a reasonable limit to enforce across all ports (and avoids wasting the
additional memory).

Also clarifies that `MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN` does not include
the null terminator (which was unclear before).

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
This commit is contained in:
Jim Mussared 2023-09-29 22:49:49 +10:00 committed by Damien George
parent d6c55a40fe
commit b329fdcb73
6 changed files with 15 additions and 8 deletions
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5
docs/library/network.rst
View File

@ -188,6 +188,11 @@ The following are functions available in the network module.
during connection. For this reason, you must set the hostname before
activating/connecting your network interfaces.
The length of the hostname is limited to 32 characters.
:term:`MicroPython ports <MicroPython port>` may choose to set a lower
limit for memory reasons. If the given name does not fit, a `ValueError`
is raised.
The default hostname is typically the name of the board.
.. function:: phy_mode([mode])

6
extmod/modnetwork.c
View File

@ -35,7 +35,7 @@
#if MICROPY_PY_NETWORK
#include "shared/netutils/netutils.h"
#include "modnetwork.h"
#include "extmod/modnetwork.h"
#if MICROPY_PY_NETWORK_CYW43
// So that CYW43_LINK_xxx constants are available to MICROPY_PORT_NETWORK_INTERFACES.
@ -56,7 +56,7 @@ char mod_network_country_code[2] = "XX";
#error "MICROPY_PY_NETWORK_HOSTNAME_DEFAULT must be set in mpconfigport.h or mpconfigboard.h"
#endif
char mod_network_hostname[MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN] = MICROPY_PY_NETWORK_HOSTNAME_DEFAULT;
char mod_network_hostname[MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN + 1] = MICROPY_PY_NETWORK_HOSTNAME_DEFAULT;
#ifdef MICROPY_PORT_NETWORK_INTERFACES
@ -122,7 +122,7 @@ STATIC mp_obj_t network_hostname(size_t n_args, const mp_obj_t *args) {
} else {
size_t len;
const char *str = mp_obj_str_get_data(args[0], &len);
if (len >= MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN) {
if (len > MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN) {
mp_raise_ValueError(NULL);
}
strcpy(mod_network_hostname, str);

6
extmod/modnetwork.h
View File

@ -56,10 +56,12 @@
extern char mod_network_country_code[2];
#ifndef MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN
#define MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN (16)
// Doesn't include the null terminator.
#define MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN (32)
#endif
extern char mod_network_hostname[MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN];
// This is a null-terminated string.
extern char mod_network_hostname[MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN + 1];
#if MICROPY_PY_LWIP
struct netif;

2
extmod/network_cyw43.c
View File

@ -500,7 +500,7 @@ STATIC mp_obj_t network_cyw43_config(size_t n_args, const mp_obj_t *args, mp_map
// TODO: Deprecated. Use network.hostname(name) instead.
size_t len;
const char *str = mp_obj_str_get_data(e->value, &len);
if (len >= MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN) {
if (len > MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN) {
mp_raise_ValueError(NULL);
}
strcpy(mod_network_hostname, str);

2
ports/esp32/network_wlan.c
View File

@ -524,7 +524,7 @@ STATIC mp_obj_t network_wlan_config(size_t n_args, const mp_obj_t *args, mp_map_
// TODO: Deprecated. Use network.hostname(name) instead.
size_t len;
const char *str = mp_obj_str_get_data(kwargs->table[i].value, &len);
if (len >= MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN) {
if (len > MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN) {
mp_raise_ValueError(NULL);
}
strcpy(mod_network_hostname, str);

2
ports/esp8266/network_wlan.c
View File

@ -404,7 +404,7 @@ STATIC mp_obj_t esp_config(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs
// TODO: Deprecated. Use network.hostname(name) instead.
size_t len;
const char *str = mp_obj_str_get_data(kwargs->table[i].value, &len);
if (len >= MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN) {
if (len > MICROPY_PY_NETWORK_HOSTNAME_MAX_LEN) {
mp_raise_ValueError(NULL);
}
strcpy(mod_network_hostname, str);