commit 0928a95ffe91862938cee997c9e30602fa7884ab
author Jan Kiszka <jan.kiszka@web.de> Thu May 21 22:43:39 2009 +0200
committer Anthony Liguori <aliguori@us.ibm.com> Fri May 22 10:50:34 2009 -0500
tree c8c9a26db198d6311fe1e2e7659d17978a5f9dfc
parent f8d926e9cd96e52ebcfd9ffdeab83c0d5e6b9622

slirp: Reassign same address to same DHCP client

In case a client restarts a DHCP recovery without releasing its old
address, reassign the same address to prevent consuming free addresses
and moving away from the standard client address.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

slirp/bootp.c

diff --git a/slirp/bootp.c b/slirp/bootp.c
index ae71e46..4e0082d 100644
--- a/slirp/bootp.c
+++ b/slirp/bootp.c
@@ -49,13 +49,15 @@
 #define dprintf(fmt, ...)
 #endif
 
-static BOOTPClient *get_new_addr(struct in_addr *paddr)
+static BOOTPClient *get_new_addr(struct in_addr *paddr,
+                                 const uint8_t *macaddr)
 {
     BOOTPClient *bc;
     int i;
 
     for(i = 0; i < NB_ADDR; i++) {
-        if (!bootp_clients[i].allocated)
+        bc = &bootp_clients[i];
+        if (!bc->allocated || !memcmp(macaddr, bc->macaddr, 6))
             goto found;
     }
     return NULL;
@@ -192,7 +194,7 @@
         }
         if (!bc) {
          new_addr:
-            bc = get_new_addr(&daddr.sin_addr);
+            bc = get_new_addr(&daddr.sin_addr, client_ethaddr);
             if (!bc) {
                 dprintf("no address left\n");
                 return;