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import of dnsmasq-2.7.tar.gz

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This commit is contained in:
Simon Kelley
2004-04-23 22:21:21 +01:00
parent 33820b7ed9
commit a84fa1d085
14 changed files with 321 additions and 174 deletions
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158
src/rfc2131.c
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@@ -35,6 +35,7 @@
#define OPTION_MAXMESSAGE 57
#define OPTION_T1 58
#define OPTION_T2 59
#define OPTION_VENDOR_ID 60
#define OPTION_CLIENT_ID 61
#define OPTION_END 255
@@ -77,6 +78,7 @@ int dhcp_reply(struct dhcp_context *context,
struct udp_dhcp_packet *rawpacket,
unsigned int sz, time_t now, char *namebuff,
struct dhcp_opt *dhcp_opts, struct dhcp_config *dhcp_configs,
struct dhcp_vendor *vendors,
char *domain_suffix, char *dhcp_file, char *dhcp_sname,
struct in_addr dhcp_next_server, struct in_addr router)
{
@@ -93,7 +95,9 @@ int dhcp_reply(struct dhcp_context *context,
unsigned int renewal_time, expires_time, def_time;
struct dhcp_config *config;
char *netid;
struct in_addr addr;
unsigned short fuzz = 0;
if (mess->op != BOOTREQUEST ||
mess->hlen != ETHER_ADDR_LEN ||
mess->cookie != htonl(DHCP_COOKIE))
@@ -137,18 +141,7 @@ int dhcp_reply(struct dhcp_context *context,
clid = mess->chaddr;
clid_len = 0;
}
/* do we have a lease in store? */
lease = lease_find_by_client(clid, clid_len);
if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS)))
{
int len = option_len(opt);
req_options = namebuff;
memcpy(req_options, option_ptr(opt), len);
req_options[len] = OPTION_END;
}
if ((config = find_config(dhcp_configs, context, clid, clid_len, mess->chaddr, NULL)) &&
have_config(config, CONFIG_NAME))
hostname = config->hostname;
@@ -177,13 +170,34 @@ int dhcp_reply(struct dhcp_context *context,
else
*dot = 0; /* truncate */
}
/* search again now we have a hostname */
config = find_config(dhcp_configs, context, clid, clid_len, mess->chaddr, hostname);
}
}
/* search again now we have a hostname */
config = find_config(dhcp_configs, context, clid, clid_len, mess->chaddr, hostname);
def_time = have_config(config, CONFIG_TIME) ? config->lease_time : context->lease_time;
netid = have_config(config, CONFIG_NETID) ? config->netid : context->netid;
netid = context->netid;
if (have_config(config, CONFIG_NETID))
netid = config->netid;
else if ((opt = option_find(mess, sz, OPTION_VENDOR_ID)))
{
struct dhcp_vendor *vendor;
for (vendor = vendors; vendor; vendor = vendor->next)
if (vendor->len == option_len(opt) &&
memcmp(vendor->data, option_ptr(opt), vendor->len) == 0)
netid = vendor->net;
}
/* 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);
if ((opt = option_find(mess, sz, OPTION_LEASE_TIME)))
{
@@ -203,11 +217,19 @@ int dhcp_reply(struct dhcp_context *context,
else
expires_time = def_time;
}
if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS)))
{
int len = option_len(opt);
req_options = namebuff;
memcpy(req_options, option_ptr(opt), len);
req_options[len] = OPTION_END;
}
if (!(opt = option_find(mess, sz, OPTION_MESSAGE_TYPE)))
return 0;
switch (opt[2])
switch (option_uint(opt, 1))
{
case DHCPDECLINE:
if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER)) ||
@@ -261,39 +283,48 @@ int dhcp_reply(struct dhcp_context *context,
case DHCPDISCOVER:
if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP)))
mess->yiaddr = option_addr(opt);
addr = option_addr(opt);
if (have_config(config, CONFIG_DISABLE))
message = "ignored";
else if (have_config(config, CONFIG_ADDR) && !lease_find_by_addr(config->addr))
mess->yiaddr = config->addr;
else if (lease &&
((lease->addr.s_addr & context->netmask.s_addr) ==
(context->start.s_addr & context->netmask.s_addr)))
else if (lease && is_same_net(lease->addr, context->start, context->netmask))
mess->yiaddr = lease->addr;
else if ((!opt || !address_available(context, mess->yiaddr)) &&
!address_allocate(context, dhcp_configs, &mess->yiaddr))
else if (opt && address_available(context, addr))
mess->yiaddr = addr;
else if (!address_allocate(context, dhcp_configs, &mess->yiaddr, mess->chaddr))
message = "no address available";
log_packet("DISCOVER", opt ? &mess->yiaddr : NULL, mess->chaddr, iface_name, message);
log_packet("DISCOVER", opt ? &addr : NULL, mess->chaddr, iface_name, message);
if (message)
return 0;
/* ensure that we send the reply by steam even if a buggy client sets this. */
mess->ciaddr.s_addr = 0;
bootp_option_put(mess, dhcp_file, dhcp_sname);
mess->siaddr = dhcp_next_server;
mess->siaddr = dhcp_next_server.s_addr ? dhcp_next_server : iface_addr;
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_LEASE_TIME, 4, expires_time);
/* T1 and T2 are required in DHCPOFFER by HP's wacky Jetdirect client. */
if (expires_time != 0xffffffff)
{
p = option_put(p, end, OPTION_T1, 4, (expires_time/2));
p = option_put(p, end, OPTION_T2, 4, ((expires_time * 7)/8));
}
p = do_req_options(context, p, end, req_options, dhcp_opts, domain_suffix,
NULL, router, iface_addr, iface_mtu, netid);
p = option_put(p, end, OPTION_END, 0, 0);
log_packet("OFFER" , &mess->yiaddr, mess->chaddr, iface_name, NULL);
return p - (unsigned char *)mess;
case DHCPREQUEST:
if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP)))
if (have_config(config, CONFIG_DISABLE))
message = "disabled";
else if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP)))
{
/* SELECTING or INIT_REBOOT */
mess->yiaddr = option_addr(opt);
@@ -333,15 +364,17 @@ int dhcp_reply(struct dhcp_context *context,
mess->yiaddr = mess->ciaddr;
if (!lease || mess->ciaddr.s_addr != lease->addr.s_addr)
message = "lease not found";
/* desynchronise renewals */
fuzz = rand16();
while (fuzz > (renewal_time/16))
fuzz = fuzz/2;
}
/* If a machine moves networks whilst it has a lease, we catch that here. */
if ((mess->yiaddr.s_addr & context->netmask.s_addr) != (context->start.s_addr & context->netmask.s_addr))
if (!message && !is_same_net(mess->yiaddr, context->start, context->netmask))
message = "wrong network";
if (have_config(config, CONFIG_DISABLE))
message = "disabled";
log_packet("REQUEST", &mess->yiaddr, mess->chaddr, iface_name, NULL);
if (message)
@@ -364,15 +397,12 @@ int dhcp_reply(struct dhcp_context *context,
lease_set_expires(lease, renewal_time == 0xffffffff ? 0 : now + (time_t)renewal_time);
bootp_option_put(mess, dhcp_file, dhcp_sname);
mess->siaddr = dhcp_next_server;
mess->siaddr = dhcp_next_server.s_addr ? dhcp_next_server : iface_addr;
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_LEASE_TIME, 4, renewal_time);
if (renewal_time != 0xffffffff)
{
unsigned short fuzz = rand16();
while (fuzz > (renewal_time/16))
fuzz = fuzz/2;
p = option_put(p, end, OPTION_T1, 4, (renewal_time/2) - fuzz);
p = option_put(p, end, OPTION_T2, 4, ((renewal_time * 7)/8) - fuzz);
}
@@ -383,12 +413,12 @@ int dhcp_reply(struct dhcp_context *context,
case DHCPINFORM:
if (have_config(config, CONFIG_DISABLE))
{
log_packet("INFORM", &mess->ciaddr, mess->chaddr, iface_name, "ignored");
return 0;
}
message = "ignored";
log_packet("INFORM", &mess->ciaddr, mess->chaddr, iface_name, NULL);
log_packet("INFORM", &mess->ciaddr, mess->chaddr, iface_name, message);
if (message || mess->ciaddr.s_addr == 0)
return 0;
p = option_put(p, end, OPTION_MESSAGE_TYPE, 1, DHCPACK);
p = option_put(p, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(iface_addr.s_addr));
@@ -546,6 +576,10 @@ static int in_list(unsigned char *list, int opt)
{
int i;
/* If no requested options, send everything, not nothing. */
if (!list)
return 1;
for (i = 0; list[i] != OPTION_END; i++)
if (opt == list[i])
return 1;
@@ -555,11 +589,15 @@ static int in_list(unsigned char *list, int opt)
static struct dhcp_opt *option_find2(char *netid, struct dhcp_opt *opts, int opt)
{
for (; opts; opts = opts->next)
if (opts->opt == opt &&
(!opts->netid || (netid && strcmp(opts->netid, netid) == 0)))
return opts;
return NULL;
struct dhcp_opt *tmp;
for (tmp = opts; tmp; tmp = tmp->next)
if (tmp->opt == opt &&
((!netid && !tmp->netid) ||
(netid && tmp->netid && strcmp(tmp->netid, netid) == 0)))
return tmp;
return netid ? option_find2(NULL, opts, opt) : NULL;
}
static unsigned char *do_req_options(struct dhcp_context *context,
@@ -571,11 +609,8 @@ static unsigned char *do_req_options(struct dhcp_context *context,
struct in_addr iface_addr,
int iface_mtu, char *netid)
{
int i;
if (!req_options)
return p;
struct dhcp_opt *opt;
if (in_list(req_options, OPTION_MAXMESSAGE))
p = option_put(p, end, OPTION_MAXMESSAGE, 2,
DNSMASQ_PACKETSZ > iface_mtu ?
@@ -607,14 +642,13 @@ static unsigned char *do_req_options(struct dhcp_context *context,
if (hostname && in_list(req_options, OPTION_HOSTNAME))
p = option_put_string(p, end, OPTION_HOSTNAME, hostname);
for (i = 0; req_options[i] != OPTION_END; i++)
for (opt=config_opts; opt; opt = opt->next)
{
struct dhcp_opt *opt;
if (req_options[i] == OPTION_HOSTNAME ||
req_options[i] == OPTION_MAXMESSAGE ||
!(opt = option_find2(netid, config_opts, req_options[i])) ||
(p + opt->len + 3 >= end))
if (opt->opt == OPTION_HOSTNAME ||
opt->opt == OPTION_MAXMESSAGE ||
!in_list(req_options, opt->opt) ||
opt != option_find2(netid, config_opts, opt->opt) ||
p + opt->len + 3 >= end)
continue;
/* For the options we have default values on
@@ -631,7 +665,7 @@ static unsigned char *do_req_options(struct dhcp_context *context,
*(p++) = opt->len;
if (opt->len == 0)
continue;
if (opt->is_addr)
{
int j;