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import of dnsmasq-2.19.tar.gz

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This commit is contained in:
Simon Kelley
2004-12-13 20:56:23 +00:00
parent 59353a6b56
commit bb01cb9604
9 changed files with 118 additions and 63 deletions
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100
src/rfc2131.c
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@@ -59,13 +59,13 @@ 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);
static void bootp_option_put(struct dhcp_packet *mess,
struct dhcp_boot *boot_opts, struct dhcp_netid *netids);
static int option_len(unsigned char *opt);
static unsigned int option_len(unsigned char *opt);
static void *option_ptr(unsigned char *opt);
static struct in_addr option_addr(unsigned char *opt);
static unsigned int option_uint(unsigned char *opt, int size);
static void log_packet(char *type, struct in_addr *addr, unsigned char *hwaddr, char *interface, char *string);
static int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool);
static unsigned char *option_find(struct dhcp_packet *mess, int size, int opt_type);
static unsigned char *option_find(struct dhcp_packet *mess, int size, int opt_type, unsigned int minsize);
static unsigned char *do_req_options(struct dhcp_context *context,
unsigned char *p, unsigned char *end,
unsigned char *req_options,
@@ -126,7 +126,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
return 0;
/* check for DHCP rather than BOOTP */
if ((opt = option_find(mess, sz, OPTION_MESSAGE_TYPE)))
if ((opt = option_find(mess, sz, OPTION_MESSAGE_TYPE, 1)))
{
mess_type = option_uint(opt, 1);
@@ -136,18 +136,18 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
/* Some buggy clients set ciaddr when they shouldn't, so clear that here since
it can affect the context-determination code. */
if ((option_find(mess, sz, OPTION_REQUESTED_IP) || mess_type == DHCPDISCOVER))
if ((option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ) || mess_type == DHCPDISCOVER))
mess->ciaddr.s_addr = 0;
/* Check for RFC3011 subnet selector */
if ((opt = option_find(mess, sz, OPTION_SUBNET_SELECT)))
if ((opt = option_find(mess, sz, OPTION_SUBNET_SELECT, INADDRSZ)))
subnet_addr = option_addr(opt);
/* If there is no client identifier option, use the hardware address */
if ((opt = option_find(mess, sz, OPTION_CLIENT_ID)))
if ((opt = option_find(mess, sz, OPTION_CLIENT_ID, 1)))
{
clid = option_ptr(opt);
clid_len = option_len(opt);
clid = option_ptr(opt);
}
else
clid = mess->chaddr;
@@ -253,9 +253,9 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
if (have_config(config, CONFIG_NAME))
hostname = config->hostname;
else if ((opt = option_find(mess, sz, OPTION_HOSTNAME)))
else if ((opt = option_find(mess, sz, OPTION_HOSTNAME, 1)))
{
int len = option_len(opt);
unsigned int len = option_len(opt);
hostname = daemon->dhcp_buff;
memcpy(hostname, option_ptr(opt), len);
/* May not be zero terminated */
@@ -263,33 +263,14 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
/* ensure there are no strange chars in there */
if (!canonicalise(hostname))
hostname = NULL;
else
else if ((hostname = strip_hostname(daemon, hostname)) && !config)
{
char *dot = strchr(hostname, '.');
if (dot)
{
if (!daemon->domain_suffix || !hostname_isequal(dot+1, daemon->domain_suffix))
{
syslog(LOG_WARNING, "Ignoring DHCP host name %s because it has an illegal domain part", hostname);
hostname = NULL;
}
else
{
*dot = 0; /* truncate */
if (strlen(hostname) == 0)
hostname = NULL; /* nothing left */
}
}
/* Search again now we have a hostname.
Only accept configs without CLID and HWADDR here, (they won't match)
to avoid impersonation by name. */
if (!config)
{
struct dhcp_config *new = find_config(daemon->dhcp_conf, context, NULL, 0, mess->chaddr, hostname);
if (!have_config(new, CONFIG_CLID) && !have_config(new, CONFIG_HWADDR))
config = new;
}
struct dhcp_config *new = find_config(daemon->dhcp_conf, context, NULL, 0, mess->chaddr, hostname);
if (!have_config(new, CONFIG_CLID) && !have_config(new, CONFIG_HWADDR))
config = new;
}
}
@@ -307,10 +288,10 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
assume that the option is a single string and non RFC3004 compliant
and just do the substring match. dhclient provides these broken options. */
if ((opt = option_find(mess, sz, OPTION_USER_CLASS)))
if ((opt = option_find(mess, sz, OPTION_USER_CLASS, 1)))
{
unsigned char *ucp = option_ptr(opt);
int tmp, j;
unsigned int tmp, j;
for (j = 0; j < option_len(opt); j += ucp[j] + 1);
if (j == option_len(opt))
for (j = 0; j < option_len(opt); j = tmp)
@@ -321,9 +302,9 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
}
for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next)
if ((opt = option_find(mess, sz, vendor->is_vendor ? OPTION_VENDOR_ID : OPTION_USER_CLASS)))
if ((opt = option_find(mess, sz, vendor->is_vendor ? OPTION_VENDOR_ID : OPTION_USER_CLASS, 1)))
{
int i;
unsigned int i;
for (i = 0; i <= (option_len(opt) - vendor->len); i++)
if (memcmp(vendor->data, option_ptr(opt)+i, vendor->len) == 0)
{
@@ -348,23 +329,22 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
/* do we have a lease in store? */
lease = lease_find_by_client(clid, clid_len);
if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS)))
if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS, 0)))
{
int len = option_len(opt);
req_options = daemon->dhcp_buff2;
memcpy(req_options, option_ptr(opt), len);
req_options[len] = OPTION_END;
memcpy(req_options, option_ptr(opt), option_len(opt));
req_options[option_len(opt)] = OPTION_END;
}
switch (mess_type)
{
case DHCPDECLINE:
if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER)) ||
if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) ||
(iface_addr.s_addr != option_addr(opt).s_addr))
return 0;
/* sanitise any message. Paranoid? Moi? */
if ((opt = option_find(mess, sz, OPTION_MESSAGE)))
if ((opt = option_find(mess, sz, OPTION_MESSAGE, 1)))
{
char *p = option_ptr(opt), *q = daemon->dhcp_buff;
int i;
@@ -379,7 +359,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
message = daemon->dhcp_buff;
}
if (!(opt = option_find(mess, sz, OPTION_REQUESTED_IP)))
if (!(opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ)))
return 0;
log_packet("DECLINE", option_ptr(opt), mess->chaddr, iface_name, message);
@@ -401,7 +381,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
return 0;
case DHCPRELEASE:
if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER)) ||
if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) ||
(iface_addr.s_addr != option_addr(opt).s_addr))
return 0;
@@ -415,7 +395,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
return 0;
case DHCPDISCOVER:
if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP)))
if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ)))
addr = option_addr(opt);
if (ignore || have_config(config, CONFIG_DISABLE))
message = "ignored";
@@ -442,7 +422,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
}
time = have_config(config, CONFIG_TIME) ? config->lease_time : context->lease_time;
if ((opt = option_find(mess, sz, OPTION_LEASE_TIME)))
if ((opt = option_find(mess, sz, OPTION_LEASE_TIME, 4)))
{
unsigned int req_time = option_uint(opt, 4);
if (time == 0xffffffff || (req_time != 0xffffffff && req_time < time))
@@ -472,12 +452,12 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
case DHCPREQUEST:
if (ignore || have_config(config, CONFIG_DISABLE))
return 0;
if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP)))
if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ)))
{
/* SELECTING or INIT_REBOOT */
mess->yiaddr = option_addr(opt);
if ((opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER)))
if ((opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)))
{
/* SELECTING */
if (iface_addr.s_addr != option_addr(opt).s_addr)
@@ -569,7 +549,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
}
time = have_config(config, CONFIG_TIME) ? config->lease_time : context->lease_time;
if ((opt = option_find(mess, sz, OPTION_LEASE_TIME)))
if ((opt = option_find(mess, sz, OPTION_LEASE_TIME, 4)))
{
unsigned int req_time = option_uint(opt, 4);
if (time == 0xffffffff || (req_time != 0xffffffff && req_time < time))
@@ -577,6 +557,8 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
}
lease_set_hwaddr(lease, mess->chaddr);
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);
@@ -620,6 +602,8 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
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));
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);
p = option_end(p, end, mess);
@@ -644,7 +628,7 @@ static void log_packet(char *type, struct in_addr *addr, unsigned char *hwaddr,
string ? string : "");
}
static int option_len(unsigned char *opt)
static unsigned int option_len(unsigned char *opt)
{
return opt[1];
}
@@ -756,13 +740,13 @@ static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt
while (*p != OPTION_END)
{
if (end && (p >= end))
if (p >= end)
return 0; /* malformed packet */
else if (*p == OPTION_PAD)
p++;
else if (*p == OPTION_OVERLOAD)
{
if (end && (p >= end - 3))
if (p >= end - 3)
return 0; /* malformed packet */
if (overload)
*overload = *(p+2);
@@ -771,10 +755,10 @@ static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt
else
{
int opt_len;;
if (end && (p >= end - 2))
if (p >= end - 2)
return 0; /* malformed packet */
opt_len = option_len(p);
if (end && (p >= end - (2 + opt_len)))
if (p >= end - (2 + opt_len))
return 0; /* malformed packet */
if (*p == opt)
return p;
@@ -785,7 +769,7 @@ static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt
return NULL;
}
static unsigned char *option_find(struct dhcp_packet *mess, int size, int opt_type)
static unsigned char *option_find(struct dhcp_packet *mess, int size, int opt_type, unsigned int minsize)
{
int overload = 0;
unsigned char *ret;
@@ -798,7 +782,11 @@ static unsigned char *option_find(struct dhcp_packet *mess, int size, int opt_ty
if (!ret && (overload & 2))
ret = option_find1(&mess->sname[0], &mess->file[64], opt_type, &overload);
/* Check the option field is big enough */
if (ret && (option_len(ret) < minsize))
ret = NULL;
return ret;
}