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import of dnsmasq-2.22.tar.gz

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This commit is contained in:
Simon Kelley
2005-03-31 17:48:32 +01:00
parent 0a852541d3
commit 91dccd0958
13 changed files with 350 additions and 188 deletions
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108
src/rfc2131.c
View File

@@ -29,6 +29,7 @@
#define OPTION_HOSTNAME 12
#define OPTION_DOMAINNAME 15
#define OPTION_BROADCAST 28
#define OPTION_VENDOR_CLASS_OPT 43
#define OPTION_REQUESTED_IP 50
#define OPTION_LEASE_TIME 51
#define OPTION_OVERLOAD 52
@@ -807,8 +808,7 @@ static int in_list(unsigned char *list, int opt)
static struct dhcp_opt *option_find2(struct dhcp_netid *netid, struct dhcp_opt *opts, int opt)
{
struct dhcp_opt *tmp;
struct dhcp_opt *tmp;
for (tmp = opts; tmp; tmp = tmp->next)
if (tmp->opt == opt)
{
@@ -824,6 +824,40 @@ static struct dhcp_opt *option_find2(struct dhcp_netid *netid, struct dhcp_opt *
return netid ? option_find2(NULL, opts, opt) : NULL;
}
static unsigned char *do_opt(struct dhcp_opt *opt, unsigned char *p, unsigned char *end, struct in_addr local)
{
if (p + opt->len + 3 >= end)
return p;
*(p++) = opt->opt;
*(p++) = opt->len;
if (opt->len == 0)
return p;
if (opt->is_addr && !opt->vendor_class)
{
int j;
struct in_addr *a = (struct in_addr *)opt->val;
for (j = 0; j < opt->len; j+=INADDRSZ, a++)
{
/* zero means "self" (but not in vendorclass options.) */
if (a->s_addr == 0)
memcpy(p, &local, INADDRSZ);
else
memcpy(p, a, INADDRSZ);
p += INADDRSZ;
}
}
else
{
memcpy(p, opt->val, opt->len);
p += opt->len;
}
return p;
}
static unsigned char *do_req_options(struct dhcp_context *context,
unsigned char *p, unsigned char *end,
unsigned char *req_options,
@@ -833,6 +867,7 @@ static unsigned char *do_req_options(struct dhcp_context *context,
struct in_addr subnet_addr)
{
struct dhcp_opt *opt, *config_opts = daemon->dhcp_opts;
char *vendor_class = NULL;
if (in_list(req_options, OPTION_MAXMESSAGE))
p = option_put(p, end, OPTION_MAXMESSAGE, 2, end - (unsigned char *)daemon->dhcp_packet);
@@ -877,8 +912,7 @@ static unsigned char *do_req_options(struct dhcp_context *context,
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)
opt != option_find2(netid, config_opts, opt->opt))
continue;
/* For the options we have default values on
@@ -890,32 +924,54 @@ static unsigned char *do_req_options(struct dhcp_context *context,
opt->opt == OPTION_ROUTER ||
opt->opt == OPTION_DNSSERVER))
continue;
*(p++) = opt->opt;
*(p++) = opt->len;
if (opt->len == 0)
continue;
if (opt->is_addr)
/* opt->val has terminating zero */
if (opt->opt == OPTION_VENDOR_ID)
vendor_class = opt->val;
else
p = do_opt(opt, p, end, context->local);
}
if (in_list(req_options, OPTION_VENDOR_ID))
{
for (opt = daemon->vendor_opts; opt; opt = opt->next)
if (!opt->netid || match_netid(opt->netid, netid))
{
if (vendor_class && strcmp(vendor_class, opt->vendor_class) != 0)
syslog(LOG_WARNING, "More than one vendor class matches, using %s", vendor_class);
else
vendor_class = opt->vendor_class;
}
if (vendor_class)
{
int j;
struct in_addr *a = (struct in_addr *)opt->val;
for (j = 0; j < opt->len; j+=INADDRSZ, a++)
p = option_put_string(p, end, OPTION_VENDOR_ID, vendor_class);
if (in_list(req_options, OPTION_VENDOR_CLASS_OPT))
{
/* zero means "self" */
if (a->s_addr == 0)
memcpy(p, &context->local, INADDRSZ);
else
memcpy(p, a, INADDRSZ);
p += INADDRSZ;
unsigned char *plen, *oend = end;
/* encapsulated options can only be 256 bytes,
even of the packet is larger */
if (p + 256 < end)
oend = p + 256;
if (p + 3 >= oend)
return p;
*(p++) = OPTION_VENDOR_CLASS_OPT;
plen = p++; /* fill in later */
for (opt = daemon->vendor_opts; opt; opt = opt->next)
if ((!opt->netid || match_netid(opt->netid, netid)) &&
strcmp(vendor_class, opt->vendor_class) == 0)
p = do_opt(opt, p, oend, context->local);
*plen = p - plen - 1;
}
}
else
{
memcpy(p, opt->val, opt->len);
p += opt->len;
}
}
}
return p;
}