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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>
This commit is contained in:
Jan Kiszka 2009-05-21 22:43:39 +02:00 committed by Anthony Liguori
parent f8d926e9cd
commit 0928a95ffe
1 changed files with 5 additions and 3 deletions
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8
slirp/bootp.c
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@ -49,13 +49,15 @@ if (slirp_debug & DBG_CALL) { fprintf(dfd, fmt, ## __VA_ARGS__); fflush(dfd); }
#define dprintf(fmt, ...) #define dprintf(fmt, ...)
#endif #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; BOOTPClient *bc;
int i; int i;
for(i = 0; i < NB_ADDR; 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; goto found;
} }
return NULL; return NULL;
@ -192,7 +194,7 @@ static void bootp_reply(const struct bootp_t *bp)
} }
if (!bc) { if (!bc) {
new_addr: new_addr:
bc = get_new_addr(&daddr.sin_addr); bc = get_new_addr(&daddr.sin_addr, client_ethaddr);
if (!bc) { if (!bc) {
dprintf("no address left\n"); dprintf("no address left\n");
return; return;