* This file should be edited in a window with a width of 141 characters
* ick
*/
+#include "config.h"
+
#include "IPcheck.h"
#include "client.h"
#include "ircd.h"
+#include "msg.h"
#include "numnicks.h" /* NumNick, NumServ (GODMODE) */
-#include "querycmds.h" /* UserStats */
#include "ircd_alloc.h"
-#include "s_bsd.h" /* SetIPChecked */
+#include "ircd_events.h"
+#include "s_debug.h" /* Debug */
#include "s_user.h" /* TARGET_DELAY */
#include "send.h"
-#include "struct.h"
#include <assert.h>
-#include <stdio.h> /* NULL ... bleah */
-/*
- * IP number and last targets of a user that just disconnected.
- * Used to allow a user that shortly disconnected to rejoin
- * the channels he/she was on.
- */
-struct ip_targets_st {
- struct in_addr ip;
- unsigned char free_targets;
- unsigned char targets[MAXTARGETS];
-};
-/* We keep one IPregistry for each IP number (for both, remote and local clients) */
-struct IPregistry {
- union {
- struct in_addr ip; /* The IP number of the registry entry. */
- struct ip_targets_st *ptr; /* a list of targets */
- } ip_targets;
- unsigned int last_connect:16; /* Time of last connect (attempt), see BITMASK
- * below, or time of last disconnect when
- * `connected' is zero. */
- unsigned int connected:8; /* Used for IP# throttling: Number of
- * currently on-line clients with this IP */
- unsigned int connect_attempts:4; /* Used for connect speed throttling: Number of clients that connected with this IP number
- or `15' when then real value is >= 15. This value is only valid when the last connect
- was less then IPCHECK_CLONE_PERIOD seconds ago, it should considered to be 0 otherwise. */
- unsigned int free_targets:4; /* Number of free targets that the next local client will inherit on connect,
- or HAS_TARGETS_MAGIC when ip_targets.ptr is a pointer to a ip_targets_st. */
+struct IPTargetEntry {
+ int count;
+ unsigned char targets[MAXTARGETS];
};
-struct IPregistry_vector {
- unsigned short length;
- unsigned short allocated_length;
- struct IPregistry *vector;
+struct IPRegistryEntry {
+ struct IPRegistryEntry* next;
+ struct IPTargetEntry* target;
+ unsigned int addr;
+ int last_connect;
+ unsigned short connected;
+ unsigned char attempts;
};
-#define HASHTABSIZE 0x2000 /* Must be power of 2 */
-static struct IPregistry_vector IPregistry_hashtable[HASHTABSIZE];
-
/*
- * Calculate a `hash' value between 0 and HASHTABSIZE, from the internet address `in_addr'.
- * Apply it immedeately to the table, effectively hiding the table itself.
+ * Hash table for IPv4 address registry
+ *
+ * Hash table size must be a power of 2
+ * Use 64K hash table to conserve memory
*/
-#define CALCULATE_HASH(in_addr) \
- struct IPregistry_vector *hash; \
- do { unsigned int ip = (in_addr).s_addr; \
- hash = &IPregistry_hashtable[((ip >> 14) + (ip >> 7) + ip) & (HASHTABSIZE - 1)]; } while(0)
+#define IP_REGISTRY_TABLE_SIZE 0x10000
+#define MASK_16 0xffff
-/*
- * Fit `now' in an unsigned short, the advantage is that we use less memory
- * `struct IPregistry::last_connect' can be smaller while the only disadvantage
- * is that if someone reconnects after exactly 18 hours and 12 minutes, and NOBODY with the
- * same _hash_ value for this IP-number did disconnect in the meantime, then the server
- * will think he reconnected immedeately. In other words: No disadvantage at all.
- */
-#define BITMASK 0xffff /* Same number of bits as `struct IPregistry::last_connect' */
-#define NOW ((unsigned short)(CurrentTime & BITMASK))
-#define CONNECTED_SINCE(x) ((unsigned short)((CurrentTime & BITMASK) - (x)->last_connect))
+#define NOW ((unsigned short)(CurrentTime & MASK_16))
+#define CONNECTED_SINCE(x) (NOW - (x))
-#define IPCHECK_CLONE_LIMIT 2
-#define IPCHECK_CLONE_PERIOD 20
+#define IPCHECK_CLONE_LIMIT 4
+#define IPCHECK_CLONE_PERIOD 40
#define IPCHECK_CLONE_DELAY 600
-#define HAS_TARGETS_MAGIC 15
-#define HAS_TARGETS(entry) ((entry)->free_targets == HAS_TARGETS_MAGIC)
-#if STARTTARGETS >= HAS_TARGETS_MAGIC
-#error "That doesn't fit in 4 bits, does it?"
-#endif
+static struct IPRegistryEntry* hashTable[IP_REGISTRY_TABLE_SIZE];
+static struct IPRegistryEntry* freeList = 0;
-/* IP(entry) returns the `struct in_addr' of the IPregistry. */
-#define IP(entry) (HAS_TARGETS(entry) ? (entry)->ip_targets.ptr->ip : (entry)->ip_targets.ip)
-#define FREE_TARGETS(entry) (HAS_TARGETS(entry) ? (entry)->ip_targets.ptr->free_targets : (entry)->free_targets)
+static struct Timer expireTimer;
-static unsigned short count = 10000, average_length = 4;
+static unsigned int ip_registry_hash(unsigned int ip)
+{
+ return ((ip >> 16) ^ ip) & (IP_REGISTRY_TABLE_SIZE - 1);
+}
-static struct IPregistry *IPregistry_add(struct IPregistry_vector *iprv)
+static struct IPRegistryEntry* ip_registry_find(unsigned int ip)
{
- assert(0 != iprv);
- if (iprv->length == iprv->allocated_length)
- {
- iprv->allocated_length += 4;
- if (iprv->vector) {
- iprv->vector =
- (struct IPregistry*) MyRealloc(iprv->vector,
- iprv->allocated_length * sizeof(struct IPregistry));
- }
- else {
- iprv->vector =
- (struct IPregistry*) MyMalloc(
- iprv->allocated_length * sizeof(struct IPregistry));
- }
+ struct IPRegistryEntry* entry = hashTable[ip_registry_hash(ip)];
+ for ( ; entry; entry = entry->next) {
+ if (entry->addr == ip)
+ break;
}
- return &iprv->vector[iprv->length++];
+ return entry;
}
-static struct IPregistry *IPregistry_find(struct IPregistry_vector *iprv,
- struct in_addr ip)
+static void ip_registry_add(struct IPRegistryEntry* entry)
{
- if (iprv->length > 0)
- {
- struct IPregistry *i, *end = &iprv->vector[iprv->length];
- for (i = &iprv->vector[0]; i < end; ++i)
- if (IP(i).s_addr == ip.s_addr)
- return i;
+ unsigned int bucket = ip_registry_hash(entry->addr);
+ entry->next = hashTable[bucket];
+ hashTable[bucket] = entry;
+}
+
+static void ip_registry_remove(struct IPRegistryEntry* entry)
+{
+ unsigned int bucket = ip_registry_hash(entry->addr);
+ if (hashTable[bucket] == entry)
+ hashTable[bucket] = entry->next;
+ else {
+ struct IPRegistryEntry* prev = hashTable[bucket];
+ for ( ; prev; prev = prev->next) {
+ if (prev->next == entry) {
+ prev->next = entry->next;
+ break;
+ }
+ }
}
- return NULL;
+}
+
+static struct IPRegistryEntry* ip_registry_new_entry()
+{
+ struct IPRegistryEntry* entry = freeList;
+ if (entry)
+ freeList = entry->next;
+ else
+ entry = (struct IPRegistryEntry*) MyMalloc(sizeof(struct IPRegistryEntry));
+
+ assert(0 != entry);
+ memset(entry, 0, sizeof(struct IPRegistryEntry));
+ entry->last_connect = NOW; /* Seconds since last connect attempt */
+ entry->connected = 1; /* connected clients for this IP */
+ entry->attempts = 1; /* Number attempts for this IP */
+ return entry;
+}
+
+static void ip_registry_delete_entry(struct IPRegistryEntry* entry)
+{
+ if (entry->target)
+ MyFree(entry->target);
+ entry->next = freeList;
+ freeList = entry;
}
-static struct IPregistry *IPregistry_find_with_expire(struct IPregistry_vector
- *iprv, struct in_addr ip)
+static unsigned int ip_registry_update_free_targets(struct IPRegistryEntry* entry)
{
- struct IPregistry *last;
- struct IPregistry *curr;
- struct IPregistry *retval = NULL;
+ unsigned int free_targets = STARTTARGETS;
+
+ if (entry->target) {
+ free_targets = entry->target->count + (CONNECTED_SINCE(entry->last_connect) / TARGET_DELAY);
+ if (free_targets > STARTTARGETS)
+ free_targets = STARTTARGETS;
+ entry->target->count = free_targets;
+ }
+ return free_targets;
+}
+static void ip_registry_expire_entry(struct IPRegistryEntry* entry)
+{
/*
- * if the vector is empty, IPcheck_disconnect will cause the server
- * to core when NDEBUG is defined
+ * Don't touch this number, it has statistical significance
+ * XXX - blah blah blah
*/
- if (iprv->length < 1)
- return retval;
-
- last = &iprv->vector[iprv->length - 1];
-
- for (curr = &iprv->vector[0]; curr < last;)
- {
- if (IP(curr).s_addr == ip.s_addr)
- /* `curr' is element we looked for */
- retval = curr;
- else if (curr->connected == 0)
- {
- if (CONNECTED_SINCE(curr) > 600U) /* Don't touch this number, it has statistical significance */
- {
- /* `curr' expired */
- if (HAS_TARGETS(curr))
- MyFree(curr->ip_targets.ptr);
- *curr = *last--;
- iprv->length--;
- if (--count == 0)
- {
- /* Make ever 10000 disconnects an estimation of the average vector length */
- count = 10000;
- average_length =
- (UserStats.clients + UserStats.unknowns + UserStats.local_servers) / HASHTABSIZE;
- }
- /* Now check the new element (last) that was moved to this position */
- continue;
- }
- else if (CONNECTED_SINCE(curr) > 120U && HAS_TARGETS(curr))
- {
- /* Expire storage of targets */
- struct in_addr ip1 = curr->ip_targets.ptr->ip;
- curr->free_targets = curr->ip_targets.ptr->free_targets;
- MyFree(curr->ip_targets.ptr);
- curr->ip_targets.ip = ip1;
- }
- }
- /* Did not expire, check next element */
- ++curr;
+ if (CONNECTED_SINCE(entry->last_connect) > 600) {
+ /*
+ * expired
+ */
+ ip_registry_remove(entry);
+ ip_registry_delete_entry(entry);
}
- /* Now check the last element in the list (curr == last) */
- if (IP(curr).s_addr == ip.s_addr)
- /* `curr' is element we looked for */
- retval = curr;
- else if (curr->connected == 0)
- {
- if (CONNECTED_SINCE(curr) > 600U) /* Don't touch this number, it has statistical significance */
- {
- /* `curr' expired */
- if (HAS_TARGETS(curr))
- MyFree(curr->ip_targets.ptr);
- iprv->length--;
- if (--count == 0)
- {
- /* Make ever 10000 disconnects an estimation of the average vector length */
- count = 10000;
- average_length =
- (UserStats.clients + UserStats.unknowns + UserStats.local_servers) / HASHTABSIZE;
- }
- }
- else if (CONNECTED_SINCE(curr) > 120U && HAS_TARGETS(curr))
- {
- /* Expire storage of targets */
- struct in_addr ip1 = curr->ip_targets.ptr->ip;
- curr->free_targets = curr->ip_targets.ptr->free_targets;
- MyFree(curr->ip_targets.ptr);
- curr->ip_targets.ip = ip1;
- }
+ else if (CONNECTED_SINCE(entry->last_connect) > 120 && 0 != entry->target) {
+ /*
+ * Expire storage of targets
+ */
+ MyFree(entry->target);
+ entry->target = 0;
}
- /* Do we need to shrink the vector? */
- if (iprv->allocated_length > average_length
- && iprv->allocated_length - iprv->length >= 4)
- {
- struct IPregistry *newpos;
- iprv->allocated_length = iprv->length;
- newpos =
- (struct IPregistry *)MyRealloc(iprv->vector,
- iprv->allocated_length * sizeof(struct IPregistry));
- if (newpos != iprv->vector) /* Is this ever true? */
- {
- retval =
- (struct IPregistry *)((char *)retval + ((char *)newpos -
- (char *)iprv->vector));
- iprv->vector = newpos;
+}
+
+/* Callback to run an expiry of the IPcheck registry */
+static void ip_registry_expire(struct Event* ev)
+{
+ int i;
+ struct IPRegistryEntry* entry;
+ struct IPRegistryEntry* entry_next;
+
+ assert(ET_EXPIRE == ev_type(ev));
+ assert(0 != ev_timer(ev));
+
+ for (i = 0; i < IP_REGISTRY_TABLE_SIZE; ++i) {
+ for (entry = hashTable[i]; entry; entry = entry_next) {
+ entry_next = entry->next;
+ if (0 == entry->connected)
+ ip_registry_expire_entry(entry);
}
}
- return retval;
}
-static void reset_connect_time(struct IPregistry *entry)
+/*
+ * IPcheck_init()
+ *
+ * Initializes the registry timer
+ */
+void IPcheck_init(void)
{
- unsigned int previous_free_targets;
-
- /* Apply aging */
- previous_free_targets =
- FREE_TARGETS(entry) + CONNECTED_SINCE(entry) / TARGET_DELAY;
- if (previous_free_targets > STARTTARGETS)
- previous_free_targets = STARTTARGETS;
- if (HAS_TARGETS(entry))
- entry->ip_targets.ptr->free_targets = previous_free_targets;
- else
- entry->free_targets = previous_free_targets;
-
- entry->last_connect = NOW;
+ timer_add(&expireTimer, ip_registry_expire, 0, TT_PERIODIC, 60);
}
/*
* cptr->nexttarget to be `now - (TARGET_DELAY * (FREE_TARGETS - 1))',
* where FREE_TARGETS may range from 0 till STARTTARGETS.
*/
-int IPcheck_local_connect(struct in_addr a, time_t* next_target_out)
+int ip_registry_check_local(unsigned int addr, time_t* next_target_out)
{
- struct IPregistry *entry;
- CALCULATE_HASH(a);
- assert(0 != next_target_out);
-
- if (!(entry = IPregistry_find(hash, a)))
- {
- entry = IPregistry_add(hash);
- entry->ip_targets.ip = a; /* The IP number of registry entry */
- entry->last_connect = NOW; /* Seconds since last connect attempt */
- entry->connected = 1; /* connected clients for this IP */
- entry->connect_attempts = 1; /* Number attempts for this IP */
- entry->free_targets = STARTTARGETS; /* free targets a client gets */
+ struct IPRegistryEntry* entry = ip_registry_find(addr);
+ unsigned int free_targets = STARTTARGETS;
+
+ if (0 == entry) {
+ entry = ip_registry_new_entry();
+ entry->addr = addr; /* The IP number of registry entry */
+ ip_registry_add(entry);
return 1;
}
/* Note that this also connects server connects.
if (0 == ++entry->connected)
return 0;
- if (CONNECTED_SINCE(entry) > IPCHECK_CLONE_PERIOD)
- entry->connect_attempts = 0;
-
- reset_connect_time(entry);
+ if (CONNECTED_SINCE(entry->last_connect) > IPCHECK_CLONE_PERIOD)
+ entry->attempts = 0;
- if (0 == ++entry->connect_attempts) /* Check for overflow */
- --entry->connect_attempts;
+ free_targets = ip_registry_update_free_targets(entry);
+ entry->last_connect = NOW;
- if (entry->connect_attempts <= IPCHECK_CLONE_LIMIT)
- *next_target_out = CurrentTime - (TARGET_DELAY * (FREE_TARGETS(entry) - 1));
+ if (0 == ++entry->attempts) /* Check for overflow */
+ --entry->attempts;
- /* Don't refuse connection when we just rebooted the server */
- else if (CurrentTime - me.since > IPCHECK_CLONE_DELAY)
-#ifndef NOTHROTTLE
- return 0;
-#else
+ if (entry->attempts < IPCHECK_CLONE_LIMIT) {
+ if (next_target_out)
+ *next_target_out = CurrentTime - (TARGET_DELAY * free_targets - 1);
+ }
+ else if ((CurrentTime - cli_since(&me)) > IPCHECK_CLONE_DELAY) {
+ /*
+ * Don't refuse connection when we just rebooted the server
+ */
+#ifdef NOTHROTTLE
return 1;
+#else
+ --entry->connected;
+ return 0;
#endif
+ }
return 1;
}
*
* Action:
* Update the IPcheck registry.
- * Return -1 on failure, 0 on success.
+ * Return 0 on failure, 1 on success.
*/
-int IPcheck_remote_connect(struct Client *cptr, const char *hostname,
- int is_burst)
+int ip_registry_check_remote(struct Client* cptr, int is_burst)
{
- struct IPregistry *entry;
- CALCULATE_HASH(cptr->ip);
- SetIPChecked(cptr); /* Mark that we did add/update an IPregistry entry */
- if (!(entry = IPregistry_find(hash, cptr->ip)))
- {
- entry = IPregistry_add(hash);
- entry->ip_targets.ip = cptr->ip; /* The IP number of registry entry */
- entry->last_connect = NOW; /* Seconds since last connect (attempt) */
- entry->connected = 1; /* Number of currently connected clients with this IP number */
- entry->connect_attempts = is_burst ? 1 : 0; /* Number of clients that connected with this IP number */
- entry->free_targets = STARTTARGETS; /* Number of free targets that a client gets on connect */
+ struct IPRegistryEntry* entry = ip_registry_find((cli_ip(cptr)).s_addr);
+
+ /*
+ * Mark that we did add/update an IPregistry entry
+ */
+ SetIPChecked(cptr);
+ if (0 == entry) {
+ entry = ip_registry_new_entry();
+ entry->addr = (cli_ip(cptr)).s_addr;
+ if (is_burst)
+ entry->attempts = 0;
+ ip_registry_add(entry);
}
- else
- {
-#ifdef GODMODE
- sendto_one(cptr,
- "%s NOTICE %s%s :I saw your face before my friend (connected: %u; connect_attempts %u; free_targets %u)",
- NumServ(&me), NumNick(cptr), entry->connected, entry->connect_attempts,
- FREE_TARGETS(entry));
-#endif
- if (++(entry->connected) == 0) /* Don't allow more then 255 connects from one IP number, ever */
- return -1;
- if (CONNECTED_SINCE(entry) > IPCHECK_CLONE_PERIOD)
- entry->connect_attempts = 0;
- if (!is_burst)
- {
- if (++(entry->connect_attempts) == 0) /* Check for overflow */
- --(entry->connect_attempts);
- reset_connect_time(entry);
+ else {
+ if (0 == ++entry->connected) {
+ /*
+ * Don't allow more then 255 connects from one IP number, ever
+ */
+ return 0;
+ }
+ if (CONNECTED_SINCE(entry->last_connect) > IPCHECK_CLONE_PERIOD)
+ entry->attempts = 0;
+ if (!is_burst) {
+ if (0 == ++entry->attempts) {
+ /*
+ * Check for overflow
+ */
+ --entry->attempts;
+ }
+ ip_registry_update_free_targets(entry);
+ entry->last_connect = NOW;
}
}
- return 0;
+ SetIPChecked(cptr);
+ return 1;
}
/*
* a way that the client won't be penalized when trying to reconnect
* again.
*/
-void IPcheck_connect_fail(struct in_addr a)
+void ip_registry_connect_fail(unsigned int addr)
{
- struct IPregistry *entry;
- CALCULATE_HASH(a);
- if ((entry = IPregistry_find(hash, a)))
- --entry->connect_attempts;
+ struct IPRegistryEntry* entry = ip_registry_find(addr);
+ if (entry)
+ --entry->attempts;
}
/*
*
* Finish IPcheck registration of a successfully, locally connected client.
*/
-void IPcheck_connect_succeeded(struct Client *cptr)
+void ip_registry_connect_succeeded(struct Client *cptr)
{
- struct IPregistry *entry;
- const char *tr = "";
- CALCULATE_HASH(cptr->ip);
- entry = IPregistry_find(hash, cptr->ip);
- if (HAS_TARGETS(entry))
- {
- memcpy(cptr->targets, entry->ip_targets.ptr->targets, MAXTARGETS);
+ const char* tr = "";
+ unsigned int free_targets = STARTTARGETS;
+ struct IPRegistryEntry* entry = ip_registry_find((cli_ip(cptr)).s_addr);
+
+ if (!entry) {
+ Debug((DEBUG_ERROR, "Missing registry entry for: %s", cli_sock_ip(cptr)));
+ return;
+ }
+ if (entry->target) {
+ memcpy(cli_targets(cptr), entry->target->targets, MAXTARGETS);
+ free_targets = entry->target->count;
tr = " tr";
}
- sendto_one(cptr, ":%s NOTICE %s :on %u ca %u(%u) ft %u(%u)%s",
- me.name, cptr->name, entry->connected, entry->connect_attempts,
- IPCHECK_CLONE_LIMIT, FREE_TARGETS(entry), STARTTARGETS, tr);
+ sendcmdto_one(&me, CMD_NOTICE, cptr, "%C :on %u ca %u(%u) ft %u(%u)%s",
+ cptr, entry->connected, entry->attempts, IPCHECK_CLONE_LIMIT,
+ free_targets, STARTTARGETS, tr);
}
/*
* Remove all expired IPregistry structures from the hash bucket
* that belongs to this clients IP number.
*/
-void IPcheck_disconnect(struct Client *cptr)
+void ip_registry_disconnect(struct Client *cptr)
{
- struct IPregistry *entry;
- CALCULATE_HASH(cptr->ip);
- entry = IPregistry_find_with_expire(hash, cptr->ip);
+ struct IPRegistryEntry* entry = ip_registry_find((cli_ip(cptr)).s_addr);
if (0 == entry) {
/*
* trying to find an entry for a server causes this to happen,
* servers should never have FLAGS_IPCHECK set
*/
- assert(0 != entry);
return;
}
/*
* If this was the last one, set `last_connect' to disconnect time (used for expiration)
*/
- if (--(entry->connected) == 0) {
- if (CONNECTED_SINCE(entry) > IPCHECK_CLONE_LIMIT * IPCHECK_CLONE_PERIOD)
+ if (0 == --entry->connected) {
+ if (CONNECTED_SINCE(entry->last_connect) > IPCHECK_CLONE_LIMIT * IPCHECK_CLONE_PERIOD) {
/*
* Otherwise we'd penetalize for this old value if the client reconnects within 20 seconds
*/
- entry->connect_attempts = 0;
- reset_connect_time(entry);
+ entry->attempts = 0;
+ }
+ ip_registry_update_free_targets(entry);
+ entry->last_connect = NOW;
}
if (MyConnect(cptr)) {
- unsigned int inheritance;
+ unsigned int free_targets;
/*
* Copy the clients targets
*/
- if (HAS_TARGETS(entry)) {
- entry->free_targets = entry->ip_targets.ptr->free_targets;
- MyFree(entry->ip_targets.ptr);
+ if (0 == entry->target) {
+ entry->target = (struct IPTargetEntry*) MyMalloc(sizeof(struct IPTargetEntry));
+ entry->target->count = STARTTARGETS;
}
- entry->ip_targets.ptr =
- (struct ip_targets_st*) MyMalloc(sizeof(struct ip_targets_st));
-
- assert(0 != entry->ip_targets.ptr);
- entry->ip_targets.ptr->ip = cptr->ip;
- entry->ip_targets.ptr->free_targets = entry->free_targets;
- entry->free_targets = HAS_TARGETS_MAGIC;
- memcpy(entry->ip_targets.ptr->targets, cptr->targets, MAXTARGETS);
+ assert(0 != entry->target);
+
+ memcpy(entry->target->targets, cli_targets(cptr), MAXTARGETS);
/*
* This calculation can be pretty unfair towards large multi-user hosts, but
* there is "nothing" we can do without also allowing spam bots to send more
* ALL should get no free targets when reconnecting. We'd need to store an entry
* per client (instead of per IP number) to avoid this.
*/
- if (cptr->nexttarget <= CurrentTime)
+ if (cli_nexttarget(cptr) < CurrentTime) {
/*
* Number of free targets
*/
- inheritance = (CurrentTime - cptr->nexttarget) / TARGET_DELAY + 1;
+ free_targets = (CurrentTime - cli_nexttarget(cptr)) / TARGET_DELAY + 1;
+ }
else
- inheritance = 0;
+ free_targets = 0;
/*
* Add bonus, this is pretty fuzzy, but it will help in some cases.
*/
- if (CurrentTime - cptr->firsttime > 600)
+ if ((CurrentTime - cli_firsttime(cptr)) > 600)
/*
* Was longer then 10 minutes online?
*/
- inheritance += (CurrentTime - cptr->firsttime - 600) / TARGET_DELAY;
+ free_targets += (CurrentTime - cli_firsttime(cptr) - 600) / TARGET_DELAY;
/*
* Finally, store smallest value for Judgement Day
*/
- if (inheritance < entry->ip_targets.ptr->free_targets)
- entry->ip_targets.ptr->free_targets = inheritance;
+ if (free_targets < entry->target->count)
+ entry->target->count = free_targets;
}
}
*
* Returns number of clients with the same IP number
*/
-unsigned short IPcheck_nr(struct Client *cptr)
+int ip_registry_count(unsigned int addr)
{
- struct IPregistry *entry;
- CALCULATE_HASH(cptr->ip);
- entry = IPregistry_find(hash, cptr->ip);
- return (entry ? entry->connected : 0);
+ struct IPRegistryEntry* entry = ip_registry_find(addr);
+ return (entry) ? entry->connected : 0;
}
+/*
+ * IPcheck_local_connect
+ *
+ * Event:
+ * A new connection was accept()-ed with IP number `cptr->ip.s_addr'.
+ *
+ * Action:
+ * Update the IPcheck registry.
+ * Return:
+ * 1 : You're allowed to connect.
+ * 0 : You're not allowed to connect.
+ *
+ * Throttling:
+ *
+ * A connection should be rejected when a connection from the same IP number was
+ * received IPCHECK_CLONE_LIMIT times before this connect attempt, with
+ * reconnect intervals of IPCHECK_CLONE_PERIOD seconds or less.
+ *
+ * Free target inheritance:
+ *
+ * When the client is accepted, then the number of Free Targets
+ * of the cptr is set to the value stored in the found IPregistry
+ * structure, or left at STARTTARGETS. This can be done by changing
+ * cptr->nexttarget to be `now - (TARGET_DELAY * (FREE_TARGETS - 1))',
+ * where FREE_TARGETS may range from 0 till STARTTARGETS.
+ */
+int IPcheck_local_connect(struct in_addr a, time_t* next_target_out)
+{
+ assert(0 != next_target_out);
+ return ip_registry_check_local(a.s_addr, next_target_out);
+}
+
+/*
+ * IPcheck_remote_connect
+ *
+ * Event:
+ * A remote client connected to Undernet, with IP number `cptr->ip.s_addr'
+ * and hostname `hostname'.
+ *
+ * Action:
+ * Update the IPcheck registry.
+ * Return 0 on failure, 1 on success.
+ */
+int IPcheck_remote_connect(struct Client *cptr, int is_burst)
+{
+ assert(0 != cptr);
+ return ip_registry_check_remote(cptr, is_burst);
+}
+
+/*
+ * IPcheck_connect_fail
+ *
+ * Event:
+ * This local client failed to connect due to legal reasons.
+ *
+ * Action:
+ * Neutralize the effect of calling IPcheck_local_connect, in such
+ * a way that the client won't be penalized when trying to reconnect
+ * again.
+ */
+void IPcheck_connect_fail(struct in_addr a)
+{
+ ip_registry_connect_fail(a.s_addr);
+}
+
+/*
+ * IPcheck_connect_succeeded
+ *
+ * Event:
+ * A client succeeded to finish the registration.
+ *
+ * Finish IPcheck registration of a successfully, locally connected client.
+ */
+void IPcheck_connect_succeeded(struct Client *cptr)
+{
+ assert(0 != cptr);
+ ip_registry_connect_succeeded(cptr);
+}
+
+/*
+ * IPcheck_disconnect
+ *
+ * Event:
+ * A local client disconnected or a remote client left Undernet.
+ *
+ * Action:
+ * Update the IPcheck registry.
+ * Remove all expired IPregistry structures from the hash bucket
+ * that belongs to this clients IP number.
+ */
+void IPcheck_disconnect(struct Client *cptr)
+{
+ assert(0 != cptr);
+ ip_registry_disconnect(cptr);
+}
+
+/*
+ * IPcheck_nr
+ *
+ * Returns number of clients with the same IP number
+ */
+unsigned short IPcheck_nr(struct Client *cptr)
+{
+ assert(0 != cptr);
+ return ip_registry_count(cli_ip(cptr).s_addr);
+}
projects / ircu2.10.12-pk.git / blobdiff