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Start with exit policy summaries

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svn:r16518
This commit is contained in:
Peter Palfrader 2008-08-13 12:45:01 +00:00
parent 1342964f37
commit f5adde1a17
1 changed files with 112 additions and 5 deletions
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117
src/or/policies.c
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@ -38,16 +38,23 @@ static smartlist_t *reachable_or_addr_policy = NULL;
* to directories at. */
static smartlist_t *reachable_dir_addr_policy = NULL;
/** Private networks. This list is used in two places, once to expand the
* "private" keyword when parsing our own exit policy, secondly to ignore
* just such networks when building exit policy summaries. It is important
* that all authorities agree on that list when creating summaries, so don't
* just change this without a proper migration plan and a proposal and stuff.
*/
static const char *private_nets[] = {
"0.0.0.0/8", "169.254.0.0/16",
"127.0.0.0/8", "192.168.0.0/16", "10.0.0.0/8", "172.16.0.0/12",
// "fc00::/7", "fe80::/10", "fec0::/10", "::/127",
NULL };
/** Replace all "private" entries in *<b>policy</b> with their expanded
* equivalents. */
void
policy_expand_private(smartlist_t **policy)
{
static const char *private_nets[] = {
"0.0.0.0/8", "169.254.0.0/16",
"127.0.0.0/8", "192.168.0.0/16", "10.0.0.0/8", "172.16.0.0/12",
// "fc00::/7", "fe80::/10", "fec0::/10", "::/127",
NULL };
uint16_t port_min, port_max;
int i;
@ -904,6 +911,105 @@ policy_write_item(char *buf, size_t buflen, addr_policy_t *policy,
return (int)written;
}
/** Element of an exit policy summary */
typedef struct policy_summary_item_t {
uint16_t prt_min; /**< Lowest port number to accept/reject. */
uint16_t prt_max; /**< Highest port number to accept/reject. */
uint64_t reject_count; /**< Number of IP-Addresses that are rejected to
this portrange. */
} policy_summary_item_t;
smartlist_t *policy_summary_create(void);
void policy_summary_accept(smartlist_t *summary, uint16_t prt_min, uint16_t prt_max);
void policy_summary_reject(smartlist_t *summary, uint16_t prt_min, uint16_t prt_max);
void policy_summary_add_item(smartlist_t *summary, addr_policy_t *p);
void policy_summarize(smartlist_t *policy);
/** Create a new exit policy summary, initially only with a single
* port 1-64k item */
smartlist_t *
policy_summary_create(void)
{
smartlist_t *summary;
policy_summary_item_t* item;
item = tor_malloc_zero(sizeof(policy_summary_item_t));
item->prt_min = 1;
item->prt_max = 65535;
item->reject_count = 0;
summary = smartlist_create();
smartlist_add(summary, item);
return summary;
}
void
policy_summary_accept(smartlist_t *summary,
uint16_t prt_min, uint16_t prt_max)
{
/* XXX */
(void) summary;
(void) prt_min;
(void) prt_max;
}
void
policy_summary_reject(smartlist_t *summary,
uint16_t prt_min, uint16_t prt_max)
{
/* XXX */
(void) summary;
(void) prt_min;
(void) prt_max;
}
/** Add a single exit policy item to our summary */
void
policy_summary_add_item(smartlist_t *summary, addr_policy_t *p)
{
if (p->policy_type == ADDR_POLICY_ACCEPT) {
if (p->maskbits != 0) {
policy_summary_accept(summary, p->prt_min, p->prt_max);
}
} else if (p->policy_type == ADDR_POLICY_REJECT) {
int is_private = 0;
int i;
for (i = 0; private_nets[i]; ++i) {
tor_addr_t addr;
maskbits_t maskbits;
if (tor_addr_parse_mask_ports(private_nets[i], &addr,
&maskbits, NULL, NULL)<0) {
tor_assert(0);
}
if (tor_addr_compare(&p->addr, &addr, CMP_EXACT) == 0 &&
p->maskbits == maskbits) {
is_private = 1;
break;
}
}
if (!is_private) {
policy_summary_reject(summary, p->prt_min, p->prt_max);
}
} else
tor_assert(0);
}
void
policy_summarize(smartlist_t *policy)
{
smartlist_t *summary = policy_summary_create();
tor_assert(policy);
SMARTLIST_FOREACH(policy, addr_policy_t *, p, {
policy_summary_add_item(summary, p);
});
}
/** Implementation for GETINFO control command: knows the answer for questions
* about "exit-policy/..." */
int
@ -972,3 +1078,4 @@ policies_free_all(void)
HT_CLEAR(policy_map, &policy_root);
}
/* vim:set et ts=2 shiftwidth=2: */