0236-dhcp-add-methods-for-setting-hostname.patch

From f7740c5ec7986dab71901704936a923899041720 Mon Sep 17 00:00:00 2001
From: Channel59 <caspar@meshnex.nl>
Date: Tue, 9 Jul 2024 23:54:43 +0200
Subject: [PATCH 2/2] Add methods for setting hostname -- from: https://github.com/ARMmbed/mbed-os/pull/15506/commits/979a9425499565e434db708317a4fc0dc3792af8

---
 .../include/netsocket/EMACInterface.h         |  8 ++++++
 .../include/netsocket/NetworkInterface.h      | 16 ++++++++++++
 .../netsocket/include/netsocket/nsapi_types.h | 10 +++++++
 .../netsocket/source/EMACInterface.cpp        | 26 +++++++++++++++++++
 .../netsocket/source/NetworkInterface.cpp     | 10 +++++++
 5 files changed, 70 insertions(+)

diff --git a/connectivity/netsocket/include/netsocket/EMACInterface.h b/connectivity/netsocket/include/netsocket/EMACInterface.h
index 8cf47cb703..c06aeb850e 100644
--- a/connectivity/netsocket/include/netsocket/EMACInterface.h
+++ b/connectivity/netsocket/include/netsocket/EMACInterface.h
@@ -83,6 +83,12 @@ public:
     /** @copydoc NetworkInterface::disconnect */
     nsapi_error_t disconnect() override;
 
+    /** @copydoc NetworkInterface::get_hostname */
+    const char *get_hostname() override;
+
+    /** @copydoc NetworkInterface::set_hostname */
+    nsapi_error_t set_hostname(const char *hostname) override;
+
     /** @copydoc NetworkInterface::get_mac_address */
     const char *get_mac_address() override;
 
@@ -146,6 +152,8 @@ protected:
     OnboardNetworkStack::Interface *_interface = nullptr;
     bool _dhcp = true;
     bool _blocking = true;
+    bool _hostname_set = false;
+    char _hostname[NSAPI_HOSTNAME_SIZE];
     bool _hw_mac_addr_set = false;
     char _mac_address[NSAPI_MAC_SIZE];
     char _ip_address[NSAPI_IPv6_SIZE] {};
diff --git a/connectivity/netsocket/include/netsocket/NetworkInterface.h b/connectivity/netsocket/include/netsocket/NetworkInterface.h
index 9071a1e40b..0e2aa64c9d 100644
--- a/connectivity/netsocket/include/netsocket/NetworkInterface.h
+++ b/connectivity/netsocket/include/netsocket/NetworkInterface.h
@@ -90,6 +90,22 @@ public:
      */
     virtual void set_as_default();
 
+    /** Get hostname.
+     *
+     *  @return         Hostname if configured, null otherwise
+     */
+    virtual const char *get_hostname();
+
+    /** Set hostname.
+     *
+     *  @param          hostname Hostname string
+     *  @retval         NSAPI_ERROR_OK on success
+     *  @retval         NSAPI_ERROR_UNSUPPORTED if this feature is not supported
+     *  @retval         NSAPI_ERROR_PARAMETER if hostname is not valid
+     *  @retval         NSAPI_ERROR_BUSY if hostname can't be set
+     */
+    virtual nsapi_error_t set_hostname(const char *hostname);
+
     /** Get the local MAC address.
      *
      *  Provided MAC address is intended for info or debug purposes and
diff --git a/connectivity/netsocket/include/netsocket/nsapi_types.h b/connectivity/netsocket/include/netsocket/nsapi_types.h
index 3b496d5087..28dbcc9a38 100644
--- a/connectivity/netsocket/include/netsocket/nsapi_types.h
+++ b/connectivity/netsocket/include/netsocket/nsapi_types.h
@@ -196,6 +196,16 @@ typedef enum nsapi_security {
  */
 #define NSAPI_IP_BYTES NSAPI_IPv6_BYTES
 
+/** Maximum size of hostname
+ *
+ *  According to RFC 1034 [1], Section 3.1 "Name space specifications and
+ *  terminology", 63 is the maximum size of a hostname. +1 for the string
+ *  terminator.
+ *
+ *  [1] https://www.rfc-editor.org/rfc/rfc1034
+ */
+#define NSAPI_HOSTNAME_SIZE 64
+
 /** Maximum size of MAC address representation
  */
 #define NSAPI_MAC_SIZE 18
diff --git a/connectivity/netsocket/source/EMACInterface.cpp b/connectivity/netsocket/source/EMACInterface.cpp
index f48bc0a185..26b7e29856 100644
--- a/connectivity/netsocket/source/EMACInterface.cpp
+++ b/connectivity/netsocket/source/EMACInterface.cpp
@@ -88,6 +88,32 @@ nsapi_error_t EMACInterface::disconnect()
     return NSAPI_ERROR_NO_CONNECTION;
 }
 
+const char *EMACInterface::get_hostname()
+{
+    if (_hostname_set) {
+        return _hostname;
+    }
+    return nullptr;
+}
+
+nsapi_error_t EMACInterface::set_hostname(const char *hostname)
+{
+    if (!hostname || strlen(hostname) > NSAPI_HOSTNAME_SIZE-1) {
+        return NSAPI_ERROR_PARAMETER;
+    }
+
+    if (_interface) {
+        // can't set hostname once initialized
+        return NSAPI_ERROR_BUSY;
+    }
+
+    memset(_hostname, 0, NSAPI_HOSTNAME_SIZE);
+    strncpy(_hostname, hostname, NSAPI_HOSTNAME_SIZE-1);
+    _hostname_set = true;
+
+    return NSAPI_ERROR_OK;
+}
+
 const char *EMACInterface::get_mac_address()
 {
     if (_interface && _interface->get_mac_address(_mac_address, sizeof(_mac_address))) {
diff --git a/connectivity/netsocket/source/NetworkInterface.cpp b/connectivity/netsocket/source/NetworkInterface.cpp
index 0f237f0e19..649df0f9b3 100644
--- a/connectivity/netsocket/source/NetworkInterface.cpp
+++ b/connectivity/netsocket/source/NetworkInterface.cpp
@@ -29,6 +29,16 @@ void NetworkInterface::set_as_default()
 
 }
 
+const char *NetworkInterface::get_hostname()
+{
+    return 0;
+}
+
+nsapi_error_t NetworkInterface::set_hostname(const char *hostname)
+{
+    return NSAPI_ERROR_UNSUPPORTED;
+}
+
 const char *NetworkInterface::get_mac_address()
 {
     return 0;
-- 
2.34.1