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import of dnsmasq-2.8.tar.gz

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This commit is contained in:
Simon Kelley
2004-05-13 20:27:08 +01:00
parent a84fa1d085
commit a222641cb0
12 changed files with 261 additions and 76 deletions
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131
src/rfc2131.c
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@@ -18,6 +18,10 @@
#define BOOTREPLY 2
#define DHCP_COOKIE 0x63825363
/* The Linux in-kernel DHCP client silently ignores any packet
smaller than this. Sigh........... */
#define MIN_PACKETSZ 300
#define OPTION_PAD 0
#define OPTION_NETMASK 1
#define OPTION_ROUTER 3
@@ -37,6 +41,7 @@
#define OPTION_T2 59
#define OPTION_VENDOR_ID 60
#define OPTION_CLIENT_ID 61
#define OPTION_USER_CLASS 77
#define OPTION_END 255
#define DHCPDISCOVER 1
@@ -49,6 +54,7 @@
#define DHCPINFORM 8
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);
static void bootp_option_put(struct dhcp_packet *mess, char *filename, char *sname);
static int option_len(unsigned char *opt);
@@ -64,7 +70,7 @@ static unsigned char *do_req_options(struct dhcp_context *context,
char *domainname, char *hostname,
struct in_addr router,
struct in_addr iface_addr,
int iface_mtu, char *netid);
int iface_mtu, struct dhcp_netid *netid);
static int have_config(struct dhcp_config *config, unsigned int mask)
{
@@ -84,6 +90,7 @@ int dhcp_reply(struct dhcp_context *context,
{
unsigned char *opt, *clid;
struct dhcp_lease *lease;
struct dhcp_vendor *vendor;
int clid_len;
struct dhcp_packet *mess = &rawpacket->data;
unsigned char *p = mess->options;
@@ -94,7 +101,7 @@ int dhcp_reply(struct dhcp_context *context,
char *message = NULL;
unsigned int renewal_time, expires_time, def_time;
struct dhcp_config *config;
char *netid;
struct dhcp_netid *netid = NULL;
struct in_addr addr;
unsigned short fuzz = 0;
@@ -168,7 +175,11 @@ int dhcp_reply(struct dhcp_context *context,
hostname = NULL;
}
else
*dot = 0; /* truncate */
{
*dot = 0; /* truncate */
if (strlen(hostname) == 0)
hostname = NULL; /* nothing left */
}
}
/* search again now we have a hostname */
config = find_config(dhcp_configs, context, clid, clid_len, mess->chaddr, hostname);
@@ -177,18 +188,58 @@ int dhcp_reply(struct dhcp_context *context,
def_time = have_config(config, CONFIG_TIME) ? config->lease_time : context->lease_time;
netid = context->netid;
if (have_config(config, CONFIG_NETID))
netid = config->netid;
else if ((opt = option_find(mess, sz, OPTION_VENDOR_ID)))
if (context->netid.net)
{
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;
context->netid.next = netid;
netid = &context->netid;
}
if (have_config(config, CONFIG_NETID))
{
config->netid.next = netid;
netid = &config->netid;
}
/* Theres a chance that carefully chosen data could match the same
vendor/user option twice and make a loop in the netid chain. */
for (vendor = vendors; vendor; vendor = vendor->next)
vendor->used = 0;
if ((opt = option_find(mess, sz, OPTION_VENDOR_ID)))
for (vendor = vendors; vendor; vendor = vendor->next)
if (vendor->is_vendor && !vendor->used)
{
int i;
for (i = 0; i <= (option_len(opt) - vendor->len); i++)
if (memcmp(vendor->data, option_ptr(opt)+i, vendor->len) == 0)
{
vendor->used = 1;
vendor->netid.next = netid;
netid = &vendor->netid;
break;
}
}
if ((opt = option_find(mess, sz, OPTION_USER_CLASS)))
{
unsigned char *ucp = option_ptr(opt);
int j;
for (j = 0; j < option_len(opt); j += ucp[j] + 1)
for (vendor = vendors; vendor; vendor = vendor->next)
if (!vendor->is_vendor && !vendor->used)
{
int i;
for (i = 0; i <= (ucp[j] - vendor->len); i++)
if (memcmp(vendor->data, &ucp[j+i+1], vendor->len) == 0)
{
vendor->used = 1;
vendor->netid.next = netid;
netid = &vendor->netid;
break;
}
}
}
/* Can have setting to ignore the client ID for a particular MAC address or hostname */
if (have_config(config, CONFIG_NOCLID))
{
@@ -316,7 +367,7 @@ int dhcp_reply(struct dhcp_context *context,
}
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);
p = option_end(p, end, mess);
log_packet("OFFER" , &mess->yiaddr, mess->chaddr, iface_name, NULL);
return p - (unsigned char *)mess;
@@ -385,7 +436,7 @@ int dhcp_reply(struct dhcp_context *context,
bootp_option_put(mess, NULL, NULL);
p = option_put(p, end, OPTION_MESSAGE_TYPE, 1, DHCPNAK);
p = option_put_string(p, end, OPTION_MESSAGE, message);
p = option_put(p, end, OPTION_END, 0, 0);
p = option_end(p, end, mess);
mess->flags |= htons(0x8000); /* broadcast */
return p - (unsigned char *)mess;
}
@@ -393,7 +444,8 @@ int dhcp_reply(struct dhcp_context *context,
log_packet("ACK", &mess->yiaddr, mess->chaddr, iface_name, hostname);
lease_set_hwaddr(lease, mess->chaddr);
lease_set_hostname(lease, hostname, domain_suffix);
if (hostname)
lease_set_hostname(lease, hostname, domain_suffix);
lease_set_expires(lease, renewal_time == 0xffffffff ? 0 : now + (time_t)renewal_time);
bootp_option_put(mess, dhcp_file, dhcp_sname);
@@ -408,7 +460,7 @@ int dhcp_reply(struct dhcp_context *context,
}
p = do_req_options(context, p, end, req_options, dhcp_opts, domain_suffix,
hostname, router, iface_addr, iface_mtu, netid);
p = option_put(p, end, OPTION_END, 0, 0);
p = option_end(p, end, mess);
return p - (unsigned char *)mess;
case DHCPINFORM:
@@ -424,7 +476,7 @@ int dhcp_reply(struct dhcp_context *context,
p = option_put(p, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(iface_addr.s_addr));
p = do_req_options(context, p, end, req_options, dhcp_opts, domain_suffix,
hostname, router, iface_addr, iface_mtu, netid);
p = option_put(p, end, OPTION_END, 0, 0);
p = option_end(p, end, mess);
log_packet("ACK", &mess->ciaddr, mess->chaddr, iface_name, hostname);
return p - (unsigned char *)mess;
@@ -494,20 +546,26 @@ static unsigned char *option_put(unsigned char *p, unsigned char *end, int opt,
int i;
/* always keep one octet space for the END option. */
if ((opt == OPTION_END) || (p + len + 3 < end))
if (p + len + 3 < end)
{
*(p++) = opt;
if (opt != OPTION_END)
{
*(p++) = len;
for (i = 0; i < len; i++)
*(p++) = val >> (8 * (len - (i + 1)));
}
*(p++) = len;
for (i = 0; i < len; i++)
*(p++) = val >> (8 * (len - (i + 1)));
}
return p;
}
static unsigned char *option_end(unsigned char *p, unsigned char *end, struct dhcp_packet *start)
{
*(p++) = OPTION_END;
while ((p < end) && (p - ((unsigned char *)start) < MIN_PACKETSZ))
*p++ = 0;
return p;
}
static unsigned char *option_put_string(unsigned char *p, unsigned char *end, int opt, char *string)
{
if (p + strlen(string) + 3 < end)
@@ -587,16 +645,25 @@ static int in_list(unsigned char *list, int opt)
return 0;
}
static struct dhcp_opt *option_find2(char *netid, struct dhcp_opt *opts, int opt)
static struct dhcp_opt *option_find2(struct dhcp_netid *netid, struct dhcp_opt *opts, int opt)
{
struct dhcp_opt *tmp;
struct dhcp_netid *tmp1;
for (tmp = opts; tmp; tmp = tmp->next)
if (tmp->opt == opt &&
((!netid && !tmp->netid) ||
(netid && tmp->netid && strcmp(tmp->netid, netid) == 0)))
return tmp;
if (tmp->opt == opt)
{
if (netid)
{
if (tmp->netid)
for (tmp1 = netid; tmp1; tmp1 = tmp1->next)
if (strcmp(tmp->netid, tmp1->net) == 0)
return tmp;
}
else if (!tmp->netid)
return tmp;
}
return netid ? option_find2(NULL, opts, opt) : NULL;
}
@@ -607,7 +674,7 @@ static unsigned char *do_req_options(struct dhcp_context *context,
char *domainname, char *hostname,
struct in_addr router,
struct in_addr iface_addr,
int iface_mtu, char *netid)
int iface_mtu, struct dhcp_netid *netid)
{
struct dhcp_opt *opt;