From b0dd94b504a1928751a7dfc839084868d315c517 Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen@gmail.com>
Date: Fri, 21 Jun 2024 14:26:12 +0100
Subject: [PATCH] standard/net: even field a bit more with windows by adding
 interface's MTU data.

---
 ext/standard/net.c | 48 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

diff --git a/ext/standard/net.c b/ext/standard/net.c
index 80a6541bf60f..53f13dee643e 100644
--- a/ext/standard/net.c
+++ b/ext/standard/net.c
@@ -44,9 +44,48 @@
 # include <Ws2tcpip.h>
 # include <iphlpapi.h>
 #else
+# ifdef HAVE_SYS_IOCTL_H
+#  define BSD_COMP 1
+#  include <sys/ioctl.h>
+#  include <fcntl.h>
+# endif
 # include <netdb.h>
 #endif
 
+#ifndef PHP_WIN32
+static zend_result net_get_mtu(char *ifname, zend_long *mtu)
+{
+#ifdef SIOCGIFMTU
+	struct ifreq ifr = {0};
+	zend_result status = FAILURE;
+#ifndef __sun
+	int local = socket(AF_UNIX, SOCK_DGRAM, 0);
+#else
+	int local = open("/dev/ip", O_RDONLY);
+#endif
+	if (local == -1) {
+		return FAILURE;
+	}
+
+	strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
+	if (ioctl(local, SIOCGIFMTU, &ifr) < 0) {
+		goto end;
+	}
+
+// TODO: a tad harder but mac address could be obtained
+// in the same movement.
+
+	*mtu = (zend_long)ifr.ifr_mtu;
+	status = SUCCESS;
+end:
+	close(local);
+	return status;
+#else
+	return FAILURE;
+#endif
+}
+#endif
+
 PHPAPI zend_string* php_inet_ntop(const struct sockaddr *addr) {
 	socklen_t addrlen = sizeof(struct sockaddr_in);
 
@@ -274,7 +313,7 @@ PHP_FUNCTION(net_get_interfaces) {
 	array_init(return_value);
 	for (p = addrs; p; p = p->ifa_next) {
 		zval *iface = zend_hash_str_find(Z_ARR_P(return_value), p->ifa_name, strlen(p->ifa_name));
-		zval *unicast, *status;
+		zval *unicast, *status, *mtu;
 
 		if (!iface) {
 			zval newif;
@@ -298,6 +337,13 @@ PHP_FUNCTION(net_get_interfaces) {
 		if (!status) {
 			add_assoc_bool(iface, "up", ((p->ifa_flags & IFF_UP) != 0));
 		}
+		mtu = zend_hash_str_find(Z_ARR_P(iface), "mtu", sizeof("mtu") - 1);
+		if (!mtu) {
+			zend_long val;
+			if (net_get_mtu(p->ifa_name, &val) == SUCCESS) {
+				add_assoc_long(iface, "mtu", val);
+			}
+		}
 	}
 
 	freeifaddrs(addrs);