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geoip: Add a lookup function for client map entry

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The upcoming DoS mitigation subsytem needs to keep information on a per-IP
basis which is also what the geoip clientmap does.

For another subsystem to access that clientmap, this commit adds a lookup
function that returns the entry. For this, the clientmap_entry_t had to be
moved to the header file.

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2018-01-25 15:44:48 -05:00
parent a2aaf9509b
commit 93b826faaa
2 changed files with 43 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
src/or/geoip.c
View File

@ -472,24 +472,6 @@ geoip_db_digest(sa_family_t family)
return hex_str(geoip6_digest, DIGEST_LEN);
}
/** Entry in a map from IP address to the last time we've seen an incoming
* connection from that IP address. Used by bridges only, to track which
* countries have them blocked. */
typedef struct clientmap_entry_t {
HT_ENTRY(clientmap_entry_t) node;
tor_addr_t addr;
/* Name of pluggable transport used by this client. NULL if no
pluggable transport was used. */
char *transport_name;
/** Time when we last saw this IP address, in MINUTES since the epoch.
*
* (This will run out of space around 4011 CE. If Tor is still in use around
* 4000 CE, please remember to add more bits to last_seen_in_minutes.) */
unsigned int last_seen_in_minutes:30;
unsigned int action:2;
} clientmap_entry_t;
/** Largest allowable value for last_seen_in_minutes. (It's a 30-bit field,
* so it can hold up to (1u<<30)-1, or 0x3fffffffu.
*/
@ -564,8 +546,7 @@ geoip_note_client_seen(geoip_client_action_t action,
time_t now)
{
const or_options_t *options = get_options();
clientmap_entry_t lookup, *ent;
memset(&lookup, 0, sizeof(clientmap_entry_t));
clientmap_entry_t *ent;
if (action == GEOIP_CLIENT_CONNECT) {
/* Only remember statistics as entry guard or as bridge. */
@ -583,11 +564,7 @@ geoip_note_client_seen(geoip_client_action_t action,
safe_str_client(fmt_addr((addr))),
transport_name ? transport_name : "<no transport>");
tor_addr_copy(&lookup.addr, addr);
lookup.action = (int)action;
lookup.transport_name = (char*) transport_name;
ent = HT_FIND(clientmap, &client_history, &lookup);
ent = geoip_lookup_client(addr, transport_name, action);
if (! ent) {
ent = tor_malloc_zero(sizeof(clientmap_entry_t));
tor_addr_copy(&ent->addr, addr);
@ -635,6 +612,25 @@ geoip_remove_old_clients(time_t cutoff)
&cutoff);
}
/* Return a client entry object matching the given address, transport name and
* geoip action from the clientmap. NULL if not found. The transport_name can
* be NULL. */
clientmap_entry_t *
geoip_lookup_client(const tor_addr_t *addr, const char *transport_name,
geoip_client_action_t action)
{
clientmap_entry_t lookup;
tor_assert(addr);
/* We always look for a client connection with no transport. */
tor_addr_copy(&lookup.addr, addr);
lookup.action = action;
lookup.transport_name = (char *) transport_name;
return HT_FIND(clientmap, &client_history, &lookup);
}
/** How many responses are we giving to clients requesting v3 network
* statuses? */
static uint32_t ns_v3_responses[GEOIP_NS_RESPONSE_NUM];

22
src/or/geoip.h
View File

@ -20,6 +20,25 @@ STATIC int geoip_get_country_by_ipv4(uint32_t ipaddr);
STATIC int geoip_get_country_by_ipv6(const struct in6_addr *addr);
STATIC void clear_geoip_db(void);
#endif
/** Entry in a map from IP address to the last time we've seen an incoming
* connection from that IP address. Used by bridges only to track which
* countries have them blocked, or the DoS mitigation subsystem if enabled. */
typedef struct clientmap_entry_t {
HT_ENTRY(clientmap_entry_t) node;
tor_addr_t addr;
/* Name of pluggable transport used by this client. NULL if no
pluggable transport was used. */
char *transport_name;
/** Time when we last saw this IP address, in MINUTES since the epoch.
*
* (This will run out of space around 4011 CE. If Tor is still in use around
* 4000 CE, please remember to add more bits to last_seen_in_minutes.) */
unsigned int last_seen_in_minutes:30;
unsigned int action:2;
} clientmap_entry_t;
int should_record_bridge_info(const or_options_t *options);
int geoip_load_file(sa_family_t family, const char *filename);
MOCK_DECL(int, geoip_get_country_by_addr, (const tor_addr_t *addr));
@ -33,6 +52,9 @@ void geoip_note_client_seen(geoip_client_action_t action,
const tor_addr_t *addr, const char *transport_name,
time_t now);
void geoip_remove_old_clients(time_t cutoff);
clientmap_entry_t *geoip_lookup_client(const tor_addr_t *addr,
const char *transport_name,
geoip_client_action_t action);
void geoip_note_ns_response(geoip_ns_response_t response);
char *geoip_get_transport_history(void);