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import of dnsmasq-2.28.tar.gz

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This commit is contained in:
Simon Kelley
2006-04-17 14:24:29 +01:00
parent cdeda28f82
commit 5e9e0efb01
31 changed files with 3191 additions and 2712 deletions
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154
src/lease.c
View File

@@ -10,26 +10,22 @@
GNU General Public License for more details.
*/
/* Author's email: simon@thekelleys.org.uk */
#include "dnsmasq.h"
static struct dhcp_lease *leases;
static int dns_dirty;
static enum { no, yes, force } file_dirty;
static int leases_left;
static int dns_dirty, file_dirty, leases_left;
void lease_init(struct daemon *daemon, time_t now)
{
unsigned int a0, a1, a2, a3;
unsigned long ei;
time_t expires;
unsigned char hwaddr[DHCP_CHADDR_MAX];
struct in_addr addr;
struct dhcp_lease *lease;
int clid_len = 0, hw_len, hw_type;
int has_old = 0;
dns_dirty = 1;
file_dirty = 0;
leases = NULL;
leases_left = daemon->dhcp_max;
@@ -46,26 +42,21 @@ void lease_init(struct daemon *daemon, time_t now)
&ei, daemon->dhcp_buff2, &a0, &a1, &a2, &a3,
daemon->dhcp_buff, daemon->packet) == 8)
{
#ifdef HAVE_BROKEN_RTC
if (ei)
expires = (time_t)ei + now;
else
expires = (time_t)0;
#else
#ifndef HAVE_BROKEN_RTC
/* strictly time_t is opaque, but this hack should work on all sane systems,
even when sizeof(time_t) == 8 */
expires = (time_t)ei;
time_t expires = (time_t)ei;
if (ei != 0 && difftime(now, expires) > 0)
{
has_old = 1;
file_dirty = 1;
continue; /* expired */
}
#endif
hw_len = parse_hex(daemon->dhcp_buff2, hwaddr, DHCP_CHADDR_MAX, NULL, &hw_type);
/* For backwards compatibility, no explict MAC address type means ether. */
if (hw_type == 0)
if (hw_type == 0 && hw_len != 0)
hw_type = ARPHRD_ETHER;
addr.s_addr = htonl((a0<<24) + (a1<<16) + (a2<<8) + a3);
@@ -79,14 +70,19 @@ void lease_init(struct daemon *daemon, time_t now)
if (!(lease = lease_allocate(hwaddr, (unsigned char *)daemon->packet, hw_len, hw_type, clid_len, addr)))
die (_("too many stored leases"), NULL);
#ifdef HAVE_BROKEN_RTC
if (ei != 0)
lease->expires = (time_t)ei + now;
else
lease->expires = (time_t)0;
lease->length = ei;
#else
lease->expires = expires;
#endif
if (strcmp(daemon->dhcp_buff, "*") != 0)
lease_set_hostname(lease, daemon->dhcp_buff, daemon->domain_suffix, 0);
lease_set_hostname(lease, daemon->dhcp_buff, daemon->domain_suffix, 0);
}
dns_dirty = 1;
file_dirty = has_old ? yes: no;
}
void lease_update_from_configs(struct daemon *daemon)
@@ -107,47 +103,43 @@ void lease_update_from_configs(struct daemon *daemon)
lease_set_hostname(lease, name, daemon->domain_suffix, 1); /* updates auth flag only */
}
void lease_update_file(struct daemon *daemon, int always, time_t now)
void lease_update_file(struct daemon *daemon)
{
struct dhcp_lease *lease;
int i = always; /* avoid warning */
unsigned long expires;
char *mess;
#ifdef HAVE_BROKEN_RTC
if (always || file_dirty == force)
int i;
if (file_dirty != 0)
{
lease_prune(NULL, now);
#else
if (file_dirty != no)
{
#endif
errno = 0;
rewind(daemon->lease_stream);
if (errno != 0 || ftruncate(fileno(daemon->lease_stream), 0) != 0)
goto write_err;
{
write_err:
syslog(LOG_ERR, _("failed to write %s: %m (retry in %ds)"), daemon->lease_file, LEASE_RETRY);
alarm(LEASE_RETRY);
return;
}
for (lease = leases; lease; lease = lease->next)
{
#ifdef HAVE_BROKEN_RTC
if (lease->expires)
expires = (unsigned long) difftime(lease->expires, now);
else
expires = 0;
#else
expires = now; /* eliminate warning */
expires = (unsigned long)lease->expires;
#endif
if (fprintf(daemon->lease_stream, "%lu ", expires) < 0)
if (fprintf(daemon->lease_stream, "%u ", lease->length) < 0)
goto write_err;
if (lease->hwaddr_type != ARPHRD_ETHER &&
#else
if (fprintf(daemon->lease_stream, "%lu ", (unsigned long)lease->expires) < 0)
goto write_err;
#endif
if ((lease->hwaddr_type != ARPHRD_ETHER || lease->hwaddr_len == 0) &&
fprintf(daemon->lease_stream, "%.2x-", lease->hwaddr_type) < 0)
goto write_err;
for (i = 0; i < lease->hwaddr_len - 1; i++)
if (fprintf(daemon->lease_stream, "%.2x:", lease->hwaddr[i]) < 0)
goto write_err;
if (fprintf(daemon->lease_stream, "%.2x", lease->hwaddr[i]) < 0)
goto write_err;
for (i = 0; i < lease->hwaddr_len; i++)
{
if (fprintf(daemon->lease_stream, "%.2x", lease->hwaddr[i]) < 0)
goto write_err;
if (i != lease->hwaddr_len - 1 &&
fprintf(daemon->lease_stream, ":") < 0)
goto write_err;
}
if (fprintf(daemon->lease_stream, " %s %s ", inet_ntoa(lease->addr),
lease->hostname && strlen(lease->hostname) != 0 ? lease->hostname : "*") < 0)
goto write_err;
@@ -170,19 +162,8 @@ void lease_update_file(struct daemon *daemon, int always, time_t now)
goto write_err;
if (fsync(fileno(daemon->lease_stream)) < 0)
goto write_err;
file_dirty = no;
file_dirty = 0;
}
return;
write_err:
mess = _("failed to write");
#ifdef HAVE_BROKEN_RTC
syslog(LOG_ERR, "%s %s: %m", mess, daemon->lease_file);
#else
syslog(LOG_ERR, "%s %s: %m (retry in %ds)", mess, daemon->lease_file, LEASE_RETRY);
alarm(LEASE_RETRY);
#endif
}
void lease_update_dns(struct daemon *daemon)
@@ -212,7 +193,7 @@ 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 = yes;
file_dirty = 1;
*up = lease->next; /* unlink */
if (lease->hostname)
@@ -246,6 +227,7 @@ struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int h
for (lease = leases; lease; lease = lease->next)
if ((!lease->clid || !clid) &&
hw_len != 0 &&
lease->hwaddr_len == hw_len &&
lease->hwaddr_type == hw_type &&
memcmp(hwaddr, lease->hwaddr, hw_len) == 0)
@@ -277,7 +259,12 @@ struct dhcp_lease *lease_allocate(unsigned char *hwaddr, unsigned char *clid,
lease->hostname = lease->fqdn = NULL;
lease->addr = addr;
memset(lease->hwaddr, 0, DHCP_CHADDR_MAX);
lease->hwaddr_len = 0;
lease->hwaddr_type = 0;
lease->expires = 1;
#ifdef HAVE_BROKEN_RTC
lease->length = 0xffffffff; /* illegal value */
#endif
if (!lease_set_hwaddr(lease, hwaddr, clid, hw_len, hw_type, clid_len))
{
@@ -288,30 +275,53 @@ struct dhcp_lease *lease_allocate(unsigned char *hwaddr, unsigned char *clid,
lease->next = leases;
leases = lease;
file_dirty = force;
file_dirty = 1;
leases_left--;
return lease;
}
void lease_set_expires(struct dhcp_lease *lease, time_t exp)
void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now)
{
time_t exp = now + (time_t)len;
if (len == 0xffffffff)
{
exp = 0;
len = 0;
}
if (exp != lease->expires)
{
file_dirty = yes;
dns_dirty = 1;
lease->expires = exp;
#ifndef HAVE_BROKEN_RTC
file_dirty = 1;
#endif
}
lease->expires = exp;
}
#ifdef HAVE_BROKEN_RTC
if (len != lease->length)
{
lease->length = len;
file_dirty = 1;
}
#endif
}
int lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
unsigned char *clid, int hw_len, int hw_type, int clid_len)
{
/* must have some sort of unique-id */
if (hw_len == 0 && (clid_len == 0 || !clid))
return 0;
if (hw_len != lease->hwaddr_len ||
hw_type != lease->hwaddr_type ||
hw_len == 0 ||
memcmp(lease->hwaddr, hwaddr, hw_len) != 0)
{
file_dirty = force;
file_dirty = 1;
memcpy(lease->hwaddr, hwaddr, hw_len);
lease->hwaddr_len = hw_len;
lease->hwaddr_type = hw_type;
@@ -327,15 +337,15 @@ int lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr,
if (lease->clid_len != clid_len)
{
file_dirty = force;
file_dirty = 1;
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;
file_dirty = 1;
lease->clid_len = clid_len;
memcpy(lease->clid, clid, clid_len);
}
@@ -399,7 +409,7 @@ void lease_set_hostname(struct dhcp_lease *lease, char *name, char *suffix, int
lease->fqdn = new_fqdn;
lease->auth_name = auth;
file_dirty = force;
file_dirty = 1;
dns_dirty = 1;
}