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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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130
src/rfc2131.c
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@@ -54,6 +54,8 @@
#define DHCPRELEASE 7
#define DHCPINFORM 8
#define have_config(config, mask) ((config) && ((config)->flags & (mask)))
static unsigned char *option_put(unsigned char *p, unsigned char *end, int opt, int len, unsigned int val);
static unsigned char *option_end(unsigned char *p, unsigned char *end, struct dhcp_packet *start);
static unsigned char *option_put_string(unsigned char *p, unsigned char *end, int opt, char *string);
@@ -70,20 +72,14 @@ static unsigned char *do_req_options(struct dhcp_context *context,
unsigned char *req_options,
struct daemon *daemon,
char *hostname,
struct in_addr iface_addr,
struct dhcp_netid *netid,
struct in_addr subnet_addr);
static int have_config(struct dhcp_config *config, unsigned int mask)
int dhcp_reply(struct daemon *daemon, struct dhcp_context *context, char *iface_name, unsigned int sz, time_t now)
{
return config && (config->flags & mask);
}
int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_name, unsigned int sz, time_t now)
{
struct dhcp_context *context, *context_tmp;
struct dhcp_context *context_tmp;
unsigned char *opt, *clid = NULL;
struct dhcp_lease *lease, *ltmp;
struct dhcp_lease *ltmp, *lease = NULL;
struct dhcp_vendor *vendor;
struct dhcp_netid_list *id_list;
int clid_len = 0, ignore = 0;
@@ -148,35 +144,46 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
clid_len = option_len(opt);
clid = option_ptr(opt);
}
else
clid = mess->chaddr;
/* do we have a lease in store? */
lease = lease_find_by_client(mess->chaddr, clid, clid_len);
/* If this request is missing a clid, but we've seen one before,
use it again for option matching etc. */
if (lease && !clid && lease->clid)
{
clid_len = lease->clid_len;
clid = lease->clid;
}
}
/* Determine network for this packet. If the machine has an address already, and we don't have
have a giaddr or explicit subnet selector, use the ciaddr. This is necessary because a
machine which got a lease via a relay won't use the relay to renew. */
addr =
subnet_addr.s_addr ? subnet_addr :
(mess->giaddr.s_addr ? mess->giaddr :
(mess->ciaddr.s_addr ? mess->ciaddr : iface_addr));
/* More than one context may match, we build a chain of them all on ->current
Note that if netmasks, netid or lease times don't match, odd things may happen. */
for (context = NULL, context_tmp = daemon->dhcp; context_tmp; context_tmp = context_tmp->next)
if (context_tmp->netmask.s_addr &&
is_same_net(addr, context_tmp->start, context_tmp->netmask) &&
is_same_net(addr, context_tmp->end, context_tmp->netmask))
{
context_tmp->current = context;
context = context_tmp;
}
/* Determine network for this packet. Our caller will have already linked all the
contexts which match the addresses of the receiving interface but if the
machine has an address already, or came via a relay, or we have a subnet selector,
we search again. If we don't have have a giaddr or explicit subnet selector,
use the ciaddr. This is necessary because a machine which got a lease via a
relay won't use the relay to renew. */
if (mess->giaddr.s_addr || subnet_addr.s_addr || mess->ciaddr.s_addr)
{
addr =
subnet_addr.s_addr ? subnet_addr :
(mess->giaddr.s_addr ? mess->giaddr : mess->ciaddr);
for (context = NULL, context_tmp = daemon->dhcp; context_tmp; context_tmp = context_tmp->next)
if (context_tmp->netmask.s_addr &&
is_same_net(addr, context_tmp->start, context_tmp->netmask) &&
is_same_net(addr, context_tmp->end, context_tmp->netmask))
{
context_tmp->current = context;
context = context_tmp;
}
}
if (!context)
{
syslog(LOG_WARNING, "no address range available for DHCP request %s %s",
subnet_addr.s_addr ? "with subnet selector" : "via",
subnet_addr.s_addr ? inet_ntoa(subnet_addr) : (mess->giaddr.s_addr ? inet_ntoa(mess->giaddr) : iface_name));
subnet_addr.s_addr ? "with subnet selector" : "via",
subnet_addr.s_addr ? inet_ntoa(subnet_addr) : (mess->giaddr.s_addr ? inet_ntoa(mess->giaddr) : iface_name));
return 0;
}
@@ -210,7 +217,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
if (have_config(config, CONFIG_NAME))
hostname = config->hostname;
if (context->netid.net && !context->filter_netid)
if (context->netid.net && !(context->flags & CONTEXT_FILTER))
{
context->netid.next = netid;
netid = &context->netid;
@@ -236,9 +243,9 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
message = "disabled";
p = do_req_options(context, p, end, NULL, daemon,
hostname, iface_addr, netid, subnet_addr);
hostname, netid, subnet_addr);
/* must do this after do_req_options since it overwrites filename field. */
mess->siaddr = iface_addr;
mess->siaddr = context->local;
bootp_option_put(mess, daemon->boot_config, netid);
p = option_end(p, end, mess);
log_packet(NULL, logaddr, mess->chaddr, iface_name, message);
@@ -320,14 +327,8 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
/* Can have setting to ignore the client ID for a particular MAC address or hostname */
if (have_config(config, CONFIG_NOCLID))
{
clid = mess->chaddr;
clid_len = 0;
}
/* do we have a lease in store? */
lease = lease_find_by_client(clid, clid_len);
clid = NULL;
if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS, 0)))
{
req_options = daemon->dhcp_buff2;
@@ -339,7 +340,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
{
case DHCPDECLINE:
if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) ||
(iface_addr.s_addr != option_addr(opt).s_addr))
(context->local.s_addr != option_addr(opt).s_addr))
return 0;
/* sanitise any message. Paranoid? Moi? */
@@ -381,7 +382,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
case DHCPRELEASE:
if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) ||
(iface_addr.s_addr != option_addr(opt).s_addr))
(context->local.s_addr != option_addr(opt).s_addr))
return 0;
if (lease && lease->addr.s_addr == mess->ciaddr.s_addr)
@@ -414,7 +415,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
return 0;
context = narrow_context(context, mess->yiaddr);
if (context->netid.net && !context->filter_netid)
if (context->netid.net && !(context->flags & CONTEXT_FILTER))
{
context->netid.next = netid;
netid = &context->netid;
@@ -430,10 +431,10 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
else if (lease && lease->expires != 0)
time = (unsigned int)difftime(lease->expires, now);
mess->siaddr = iface_addr;
mess->siaddr = context->local;
bootp_option_put(mess, daemon->boot_config, netid);
p = option_put(p, end, OPTION_MESSAGE_TYPE, 1, DHCPOFFER);
p = option_put(p, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(iface_addr.s_addr));
p = option_put(p, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(context->local.s_addr));
p = option_put(p, end, OPTION_LEASE_TIME, 4, time);
/* T1 and T2 are required in DHCPOFFER by HP's wacky Jetdirect client. */
if (time != 0xffffffff)
@@ -442,7 +443,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
p = option_put(p, end, OPTION_T2, 4, (time*7)/8);
}
p = do_req_options(context, p, end, req_options, daemon,
NULL, iface_addr, netid, subnet_addr);
NULL, netid, subnet_addr);
p = option_end(p, end, mess);
log_packet("OFFER" , &mess->yiaddr, mess->chaddr, iface_name, NULL);
@@ -459,7 +460,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
if ((opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)))
{
/* SELECTING */
if (iface_addr.s_addr != option_addr(opt).s_addr)
if (context->local.s_addr != option_addr(opt).s_addr)
return 0;
/* If a lease exists for this host and another address, squash it. */
@@ -517,12 +518,12 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
/* Check to see if the address is reserved as a static address for another host */
else if ((addr_config = config_find_by_address(daemon->dhcp_conf, mess->yiaddr)) && addr_config != config)
message ="address reserved";
message = "address reserved";
else if ((ltmp = lease_find_by_addr(mess->yiaddr)) && ltmp != lease)
message = "address in use";
else if (!lease && !(lease = lease_allocate(clid, clid_len, mess->yiaddr)))
else if (!lease && !(lease = lease_allocate(mess->chaddr, clid, clid_len, mess->yiaddr)))
message = "no leases left";
}
@@ -541,7 +542,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
log_packet("ACK", &mess->yiaddr, mess->chaddr, iface_name, hostname);
context = narrow_context(context, mess->yiaddr);
if (context->netid.net && !context->filter_netid)
if (context->netid.net && !(context->flags & CONTEXT_FILTER))
{
context->netid.next = netid;
netid = &context->netid;
@@ -555,17 +556,17 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
time = req_time;
}
lease_set_hwaddr(lease, mess->chaddr);
lease_set_hwaddr(lease, mess->chaddr, clid, clid_len);
if (!hostname)
hostname = host_from_dns(daemon, mess->yiaddr);
if (hostname)
lease_set_hostname(lease, hostname, daemon->domain_suffix);
lease_set_expires(lease, time == 0xffffffff ? 0 : now + (time_t)time);
mess->siaddr = iface_addr;
mess->siaddr = context->local;
bootp_option_put(mess, daemon->boot_config, netid);
p = option_put(p, end, OPTION_MESSAGE_TYPE, 1, DHCPACK);
p = option_put(p, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(iface_addr.s_addr));
p = option_put(p, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(context->local.s_addr));
p = option_put(p, end, OPTION_LEASE_TIME, 4, time);
if (time != 0xffffffff)
{
@@ -575,7 +576,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
p = option_put(p, end, OPTION_T2, 4, ((time * 7)/8) - fuzz);
}
p = do_req_options(context, p, end, req_options, daemon,
hostname, iface_addr, netid, subnet_addr);
hostname, netid, subnet_addr);
}
p = option_end(p, end, mess);
@@ -597,14 +598,14 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
netid = &context->netid;
}
mess->siaddr = iface_addr;
mess->siaddr = context->local;
bootp_option_put(mess, daemon->boot_config, netid);
p = option_put(p, end, OPTION_MESSAGE_TYPE, 1, DHCPACK);
p = option_put(p, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(iface_addr.s_addr));
p = option_put(p, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(context->local.s_addr));
if (!hostname)
hostname = host_from_dns(daemon, mess->yiaddr);
p = do_req_options(context, p, end, req_options, daemon,
hostname, iface_addr, netid, subnet_addr);
hostname, netid, subnet_addr);
p = option_end(p, end, mess);
log_packet("ACK", &mess->ciaddr, mess->chaddr, iface_name, hostname);
@@ -719,7 +720,7 @@ static unsigned char *option_end(unsigned char *p, unsigned char *end, struct dh
static unsigned char *option_put_string(unsigned char *p, unsigned char *end, int opt, char *string)
{
int len = strlen(string);
size_t len = strlen(string);
if (p + len + 3 < end)
{
@@ -828,7 +829,6 @@ static unsigned char *do_req_options(struct dhcp_context *context,
unsigned char *req_options,
struct daemon *daemon,
char *hostname,
struct in_addr iface_addr,
struct dhcp_netid *netid,
struct in_addr subnet_addr)
{
@@ -861,7 +861,7 @@ static unsigned char *do_req_options(struct dhcp_context *context,
if (in_list(req_options, OPTION_DNSSERVER) &&
!option_find2(netid, config_opts, OPTION_DNSSERVER))
p = option_put(p, end, OPTION_DNSSERVER, INADDRSZ, ntohl(iface_addr.s_addr));
p = option_put(p, end, OPTION_DNSSERVER, INADDRSZ, ntohl(context->local.s_addr));
if (daemon->domain_suffix && in_list(req_options, OPTION_DOMAINNAME) &&
!option_find2(netid, config_opts, OPTION_DOMAINNAME))
@@ -904,7 +904,7 @@ static unsigned char *do_req_options(struct dhcp_context *context,
{
/* zero means "self" */
if (a->s_addr == 0)
memcpy(p, &iface_addr, INADDRSZ);
memcpy(p, &context->local, INADDRSZ);
else
memcpy(p, a, INADDRSZ);
p += INADDRSZ;