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import of dnsmasq-2.21.tar.gz

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This commit is contained in:
Simon Kelley
2005-03-23 20:28:59 +00:00
parent f6b7dc47c7
commit 0a852541d3
21 changed files with 1195 additions and 579 deletions
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148
src/lease.c
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@@ -16,12 +16,13 @@
static struct dhcp_lease *leases;
static FILE *lease_file;
static int dns_dirty, file_dirty, new_lease;
static int dns_dirty;
enum { no, yes, force } file_dirty;
static int leases_left;
void lease_init(struct daemon *daemon, time_t now)
{
unsigned int e0, e1, e2, e3, e4, e5, a0, a1, a2, a3;
unsigned int a0, a1, a2, a3;
unsigned long ei;
time_t expires;
unsigned char hwaddr[ETHER_ADDR_LEN];
@@ -29,9 +30,7 @@ void lease_init(struct daemon *daemon, time_t now)
struct dhcp_lease *lease;
int clid_len = 0;
int has_old = 0;
char *buff = daemon->dhcp_buff;
char *buff2 = daemon->dhcp_buff2;
leases = NULL;
leases_left = daemon->dhcp_max;
@@ -42,9 +41,11 @@ void lease_init(struct daemon *daemon, time_t now)
/* a+ mode lease pointer at end. */
rewind(lease_file);
while (fscanf(lease_file, "%lu %x:%x:%x:%x:%x:%x %d.%d.%d.%d %257s %257s",
&ei, &e0, &e1, &e2, &e3, &e4, &e5, &a0, &a1, &a2, &a3,
buff, buff2) == 13)
/* client-id max length is 255 which is 255*2 digits + 254 colons
borrow DNS packet buffer which is always larger than 1000 bytes */
while (fscanf(lease_file, "%lu %40s %d.%d.%d.%d %255s %764s",
&ei, daemon->dhcp_buff2, &a0, &a1, &a2, &a3,
daemon->dhcp_buff, daemon->packet) == 8)
{
#ifdef HAVE_BROKEN_RTC
if (ei)
@@ -63,41 +64,26 @@ void lease_init(struct daemon *daemon, time_t now)
}
#endif
hwaddr[0] = e0;
hwaddr[1] = e1;
hwaddr[2] = e2;
hwaddr[3] = e3;
hwaddr[4] = e4;
hwaddr[5] = e5;
parse_hex(daemon->dhcp_buff2, hwaddr, ETHER_ADDR_LEN, NULL);
addr.s_addr = htonl((a0<<24) + (a1<<16) + (a2<<8) + a3);
/* decode hex in place */
if (strcmp(buff2, "*") == 0)
if (strcmp(daemon->packet, "*") == 0)
clid_len = 0;
else
{
int s = (strlen(buff2)/3) + 1;
for (clid_len = 0; clid_len < s; clid_len++)
{
buff2[(clid_len*3)+2] = 0;
buff2[clid_len] = strtol(&buff2[clid_len*3], NULL, 16);
}
}
clid_len = parse_hex(daemon->packet, daemon->packet, 255, NULL);
if (!(lease = lease_allocate(buff2, clid_len, addr)))
if (!(lease = lease_allocate(hwaddr, daemon->packet, clid_len, addr)))
die ("too many stored leases", NULL);
lease->expires = expires;
memcpy(lease->hwaddr, hwaddr, ETHER_ADDR_LEN);
if (strcmp(buff, "*") != 0)
lease_set_hostname(lease, buff, daemon->domain_suffix);
if (strcmp(daemon->dhcp_buff, "*") != 0)
lease_set_hostname(lease, daemon->dhcp_buff, daemon->domain_suffix);
}
dns_dirty = 1;
file_dirty = has_old;
new_lease = 0;
file_dirty = has_old ? yes: no;
daemon->lease_fd = fileno(lease_file);
}
@@ -115,18 +101,18 @@ void lease_update_from_configs(struct dhcp_config *dhcp_configs, char *domain)
lease_set_hostname(lease, config->hostname, domain);
}
void lease_update_file(int force, time_t now)
void lease_update_file(int always, time_t now)
{
struct dhcp_lease *lease;
int i = force; /* avoid warning */
int i = always; /* avoid warning */
unsigned long expires;
#ifdef HAVE_BROKEN_RTC
if (force || new_lease)
if (always || file_dirty == force)
{
lease_prune(NULL, now);
#else
if (file_dirty)
if (file_dirty != no)
{
#endif
rewind(lease_file);
@@ -149,7 +135,7 @@ void lease_update_file(int force, time_t now)
lease->hwaddr[5], inet_ntoa(lease->addr),
lease->hostname && strlen(lease->hostname) != 0 ? lease->hostname : "*");
if (lease->clid_len)
if (lease->clid && lease->clid_len != 0)
{
for (i = 0; i < lease->clid_len - 1; i++)
fprintf(lease_file, "%.2x:", lease->clid[i]);
@@ -162,8 +148,7 @@ void lease_update_file(int force, time_t now)
fflush(lease_file);
fsync(fileno(lease_file));
file_dirty = 0;
new_lease = 0;
file_dirty = no;
}
}
@@ -194,7 +179,7 @@ void lease_prune(struct dhcp_lease *target, time_t now)
tmp = lease->next;
if ((lease->expires != 0 && difftime(now, lease->expires) > 0) || lease == target)
{
file_dirty = 1;
file_dirty = yes;
*up = lease->next; /* unlink */
if (lease->hostname)
@@ -215,23 +200,21 @@ void lease_prune(struct dhcp_lease *target, time_t now)
}
struct dhcp_lease *lease_find_by_client(unsigned char *clid, int clid_len)
struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr,
unsigned char *clid, int clid_len)
{
struct dhcp_lease *lease;
if (clid_len)
{
for (lease = leases; lease; lease = lease->next)
if (lease->clid && clid_len == lease->clid_len &&
if (clid)
for (lease = leases; lease; lease = lease->next)
if (lease->clid && clid_len == lease->clid_len &&
memcmp(clid, lease->clid, clid_len) == 0)
return lease;
}
else
{
for (lease = leases; lease; lease = lease->next)
if (memcmp(clid, lease->hwaddr, ETHER_ADDR_LEN) == 0)
return lease;
}
for (lease = leases; lease; lease = lease->next)
if ((!lease->clid || !clid) &&
memcmp(hwaddr, lease->hwaddr, ETHER_ADDR_LEN) == 0)
return lease;
return NULL;
}
@@ -248,35 +231,29 @@ struct dhcp_lease *lease_find_by_addr(struct in_addr addr)
}
struct dhcp_lease *lease_allocate(unsigned char *clid, int clid_len, struct in_addr addr)
struct dhcp_lease *lease_allocate(unsigned char *hwaddr, unsigned char *clid,
int clid_len, struct in_addr addr)
{
struct dhcp_lease *lease;
if (!leases_left || !(lease = malloc(sizeof(struct dhcp_lease))))
return NULL;
lease->clid = NULL;
lease->clid_len = clid_len;
if (clid_len)
{
if (!(lease->clid = malloc(clid_len)))
{
free(lease);
return NULL;
}
memcpy(lease->clid, clid, clid_len);
}
lease->hostname = lease->fqdn = NULL;
lease->hostname = lease->fqdn = NULL;
lease->addr = addr;
memset(lease->hwaddr, 0, ETHER_ADDR_LEN);
lease->expires = 1;
if (!lease_set_hwaddr(lease, hwaddr, clid, clid_len))
{
free(lease);
return NULL;
}
lease->next = leases;
leases = lease;
file_dirty = 1;
new_lease = 1;
file_dirty = force;
leases_left--;
return lease;
@@ -285,18 +262,46 @@ struct dhcp_lease *lease_allocate(unsigned char *clid, int clid_len, struct in_a
void lease_set_expires(struct dhcp_lease *lease, time_t exp)
{
if (exp != lease->expires)
file_dirty = dns_dirty = 1;
{
file_dirty = yes;
dns_dirty = 1;
}
lease->expires = exp;
}
void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr)
int lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
unsigned char *clid, int clid_len)
{
if (memcmp(lease->hwaddr, hwaddr, ETHER_ADDR_LEN) != 0)
{
file_dirty = 1;
file_dirty = force;
memcpy(lease->hwaddr, hwaddr, ETHER_ADDR_LEN);
}
/* only update clid when one is available, stops packets
without a clid removing the record. Lease init uses
clid_len == 0 for no clid. */
if (clid_len != 0 && clid)
{
if (!lease->clid)
lease->clid_len = 0;
if (lease->clid_len != clid_len)
{
file_dirty = force;
if (lease->clid)
free(lease->clid);
if (!(lease->clid = malloc(clid_len)))
return 0;
}
else if (memcmp(lease->clid, clid, clid_len) != 0)
file_dirty = force;
lease->clid_len = clid_len;
memcpy(lease->clid, clid, clid_len);
}
return 1;
}
void lease_set_hostname(struct dhcp_lease *lease, char *name, char *suffix)
@@ -347,7 +352,8 @@ void lease_set_hostname(struct dhcp_lease *lease, char *name, char *suffix)
lease->hostname = new_name;
lease->fqdn = new_fqdn;
file_dirty = dns_dirty = 1;
file_dirty = force;
dns_dirty = 1;
}