From 2703cae2a6ff8630eda5524bb672b08ed2dd5fbd Mon Sep 17 00:00:00 2001
From: Vlad Badoiu <vlad_andrei.badoiu@upb.ro>
Date: Fri, 4 Feb 2022 17:43:45 +0200
Subject: [PATCH] Add getifaddrs and freeitaddrs

---
 Makefile.uk  |  2 ++
 getifaddrs.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+)
 create mode 100644 getifaddrs.c

diff --git a/Makefile.uk b/Makefile.uk
index 11283e0..658442a 100644
--- a/Makefile.uk
+++ b/Makefile.uk
@@ -94,6 +94,8 @@ LIBLWIP_SRCS-y += $(LIBLWIP_BASE)/serv.c
 LIBLWIP_SRCS-y += $(LIBLWIP_BASE)/inet.c|unikraft
 LIBLWIP_SRCS-$(CONFIG_LWIP_DNS) += $(LIBLWIP_BASE)/getnameinfo.c|unikraft
 endif
+
+LIBLWIP_SRCS-y += $(LIBLWIP_BASE)/getifaddrs.c|unikraft
 LIBLWIP_SRCS-$(CONFIG_LWIP_THREADS) += $(LIBLWIP_BASE)/mutex.c|unikraft
 LIBLWIP_SRCS-$(CONFIG_LWIP_THREADS) += $(LIBLWIP_BASE)/semaphore.c|unikraft
 LIBLWIP_SRCS-$(CONFIG_LWIP_THREADS) += $(LIBLWIP_BASE)/mailbox.c|unikraft
diff --git a/getifaddrs.c b/getifaddrs.c
new file mode 100644
index 0000000..d975638
--- /dev/null
+++ b/getifaddrs.c
@@ -0,0 +1,77 @@
+#include <lwip/tcp.h>
+#include <ifaddrs.h>
+
+static void
+sockaddr_from_ip_addr(
+  struct sockaddr *sockaddr,
+  const ip_addr_t *addr)
+{
+
+    memset(sockaddr, 0, sizeof(struct sockaddr_in));
+    ((struct sockaddr_in *)sockaddr)->sin_len = sizeof(struct sockaddr_in);
+    ((struct sockaddr_in *)sockaddr)->sin_family = AF_INET;
+    inet_addr_from_ip4addr(&((struct sockaddr_in *)sockaddr)->sin_addr, ip_2_ip4(addr));
+}
+
+
+int getifaddrs(struct ifaddrs **ifap)
+{
+	struct netif *netif;
+	int is_up;
+	uint8_t flags;
+
+	struct ifaddrs *prev = NULL, *ifs;
+	struct ifaddrs *head;
+
+	int ok = 0;	
+	for (netif = netif_list; netif != NULL; netif = netif->next) {
+		ifs = malloc(sizeof(struct ifaddrs));
+
+		ifs->ifa_next = NULL;
+		if (ok == 0) {
+			ok = 1;
+			head = ifs;
+		}
+
+		is_up = netif_is_up(netif);
+		flags = netif->flags;
+		printf("%s%d\n", netif->name, netif->num);
+
+		ifs->ifa_flags = flags;
+
+		char *name = malloc(3);
+		sprintf(name, "%c%c%d", netif->name[0], netif->name[1], netif->num);
+		ifs->ifa_name = name;
+		
+		struct sockaddr *t = malloc(sizeof(struct sockaddr));
+		sockaddr_from_ip_addr(t, &netif->ip_addr);
+		ifs->ifa_addr = t;
+
+
+		struct sockaddr *netmask = malloc(sizeof(struct sockaddr));
+		sockaddr_from_ip_addr(t, &netif->netmask);
+		ifs->ifa_netmask = netmask;
+
+
+		//t->sa_family = AF_INET;
+
+		//printf("%s\n", ipaddr_ntoa(&netif->ip_addr));
+
+		// struct sockaddr *ifa_addr; // &netif->ip_addr
+		// struct sockaddr *ifa_netmask // &netif->netmask
+		// ifa_ifu.ifu_dstaddr // netif->gw
+		ifs->ifa_data = NULL;
+
+		if (prev)
+			prev->ifa_next = ifs;
+
+		prev = ifs;
+	}
+	*ifap = head;
+	return 0;
+}
+
+void freeifaddrs(struct ifaddrs *ifa)
+{
+	return 0;
+}