From 787140df3992ccc3ebdc09f6d2dcb584f580f49f Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Thu, 23 Mar 2006 23:44:29 +0000 Subject: remove in place of external link --- networking/udhcp/leases.c | 158 ---------------------------------------------- 1 file changed, 158 deletions(-) delete mode 100644 networking/udhcp/leases.c (limited to 'networking/udhcp/leases.c') diff --git a/networking/udhcp/leases.c b/networking/udhcp/leases.c deleted file mode 100644 index bb08c3adb..000000000 --- a/networking/udhcp/leases.c +++ /dev/null @@ -1,158 +0,0 @@ -/* - * leases.c -- tools to manage DHCP leases - * Russ Dill July 2001 - */ - -#include -#include -#include -#include -#include - -#include "dhcpd.h" -#include "files.h" -#include "options.h" -#include "leases.h" -#include "arpping.h" -#include "common.h" - -#include "static_leases.h" - - -uint8_t blank_chaddr[] = {[0 ... 15] = 0}; - -/* clear every lease out that chaddr OR yiaddr matches and is nonzero */ -void clear_lease(uint8_t *chaddr, uint32_t yiaddr) -{ - unsigned int i, j; - - for (j = 0; j < 16 && !chaddr[j]; j++); - - for (i = 0; i < server_config.max_leases; i++) - if ((j != 16 && !memcmp(leases[i].chaddr, chaddr, 16)) || - (yiaddr && leases[i].yiaddr == yiaddr)) { - memset(&(leases[i]), 0, sizeof(struct dhcpOfferedAddr)); - } -} - - -/* add a lease into the table, clearing out any old ones */ -struct dhcpOfferedAddr *add_lease(uint8_t *chaddr, uint32_t yiaddr, unsigned long lease) -{ - struct dhcpOfferedAddr *oldest; - - /* clean out any old ones */ - clear_lease(chaddr, yiaddr); - - oldest = oldest_expired_lease(); - - if (oldest) { - memcpy(oldest->chaddr, chaddr, 16); - oldest->yiaddr = yiaddr; - oldest->expires = time(0) + lease; - } - - return oldest; -} - - -/* true if a lease has expired */ -int lease_expired(struct dhcpOfferedAddr *lease) -{ - return (lease->expires < (unsigned long) time(0)); -} - - -/* Find the oldest expired lease, NULL if there are no expired leases */ -struct dhcpOfferedAddr *oldest_expired_lease(void) -{ - struct dhcpOfferedAddr *oldest = NULL; - unsigned long oldest_lease = time(0); - unsigned int i; - - - for (i = 0; i < server_config.max_leases; i++) - if (oldest_lease > leases[i].expires) { - oldest_lease = leases[i].expires; - oldest = &(leases[i]); - } - return oldest; - -} - - -/* Find the first lease that matches chaddr, NULL if no match */ -struct dhcpOfferedAddr *find_lease_by_chaddr(uint8_t *chaddr) -{ - unsigned int i; - - for (i = 0; i < server_config.max_leases; i++) - if (!memcmp(leases[i].chaddr, chaddr, 16)) return &(leases[i]); - - return NULL; -} - - -/* Find the first lease that matches yiaddr, NULL is no match */ -struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr) -{ - unsigned int i; - - for (i = 0; i < server_config.max_leases; i++) - if (leases[i].yiaddr == yiaddr) return &(leases[i]); - - return NULL; -} - - -/* check is an IP is taken, if it is, add it to the lease table */ -static int check_ip(uint32_t addr) -{ - struct in_addr temp; - - if (arpping(addr, server_config.server, server_config.arp, server_config.interface) == 0) { - temp.s_addr = addr; - LOG(LOG_INFO, "%s belongs to someone, reserving it for %ld seconds", - inet_ntoa(temp), server_config.conflict_time); - add_lease(blank_chaddr, addr, server_config.conflict_time); - return 1; - } else return 0; -} - - -/* find an assignable address, it check_expired is true, we check all the expired leases as well. - * Maybe this should try expired leases by age... */ -uint32_t find_address(int check_expired) -{ - uint32_t addr, ret; - struct dhcpOfferedAddr *lease = NULL; - - addr = ntohl(server_config.start); /* addr is in host order here */ - for (;addr <= ntohl(server_config.end); addr++) { - - /* ie, 192.168.55.0 */ - if (!(addr & 0xFF)) continue; - - /* ie, 192.168.55.255 */ - if ((addr & 0xFF) == 0xFF) continue; - - /* Only do if it isn't an assigned as a static lease */ - if(!reservedIp(server_config.static_leases, htonl(addr))) - { - - /* lease is not taken */ - ret = htonl(addr); - if ((!(lease = find_lease_by_yiaddr(ret)) || - - /* or it expired and we are checking for expired leases */ - (check_expired && lease_expired(lease))) && - - /* and it isn't on the network */ - !check_ip(ret)) { - return ret; - break; - } - } - } - return 0; -} -- cgit v1.2.3