/*
* IRC - Internet Relay Chat, ircd/channel.c
* Copyright (C) 1996 Carlo Wood (I wish this was C++ - this sucks :/)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: numnicks.c 721 2004-07-06 17:41:00Z sirvulcan $
*/
#include "config.h"
#include "numnicks.h"
#include "client.h"
#include "ircd.h"
#include "ircd_alloc.h"
#include "ircd_string.h"
#include "match.h"
#include "s_bsd.h"
#include "s_debug.h"
#include "s_misc.h"
#include "ircd_struct.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* Numeric nicks are new as of version ircu2.10.00beta1.
*
* The idea is as follows:
* In most messages (for protocol 10+) the original nick will be
* replaced by a 3 character string: YXX
* Where 'Y' represents the server, and 'XX' the nick on that server.
*
* 'YXX' should not interfer with the input parser, and therefore is
* not allowed to contain spaces or a ':'.
* Also, 'Y' can't start with a '+' because of m_server().
*
* We keep the characters printable for debugging reasons too.
*
* The 'XX' value can be larger then the maximum number of clients
* per server, we use a mask (struct Server::nn_mask) to get the real
* client numeric. The overhead is used to have some redundancy so
* just-disconnected-client aren't confused with just-connected ones.
*/
/* These must be the same on ALL servers ! Do not change ! */
#define NUMNICKLOG 6
#define NUMNICKMAXCHAR 'z' /* See convert2n[] */
#define NUMNICKBASE 64 /* (2 << NUMNICKLOG) */
#define NUMNICKMASK 63 /* (NUMNICKBASE-1) */
#define NN_MAX_SERVER 4096 /* (NUMNICKBASE * NUMNICKBASE) */
#define NN_MAX_CLIENT 262144 /* NUMNICKBASE ^ 3 */
/*
* The internal counter for the 'XX' of local clients
*/
static unsigned int lastNNServer = 0;
static struct Client* server_list[NN_MAX_SERVER];
/* *INDENT-OFF* */
/*
* convert2y[] converts a numeric to the corresponding character.
* The following characters are currently known to be forbidden:
*
* '\0' : Because we use '\0' as end of line.
*
* ' ' : Because parse_*() uses this as parameter seperator.
* ':' : Because parse_server() uses this to detect if a prefix is a
* numeric or a name.
* '+' : Because m_nick() uses this to determine if parv[6] is a
* umode or not.
* '&', '#', '+', '$', '@' and '%' :
* Because m_message() matches these characters to detect special cases.
*/
static const char convert2y[] = {
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','[',']'
};
static const unsigned int convert2n[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
52,53,54,55,56,57,58,59,60,61, 0, 0, 0, 0, 0, 0,
0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,
15,16,17,18,19,20,21,22,23,24,25,62, 0,63, 0, 0,
0,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50,51, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/* *INDENT-ON* */
unsigned int base64toint(const char* s)
{
unsigned int i = convert2n[(unsigned char) *s++];
while (*s) {
i <<= NUMNICKLOG;
i += convert2n[(unsigned char) *s++];
}
return i;
}
const char* inttobase64(char* buf, unsigned int v, unsigned int count)
{
buf[count] = '\0';
while (count > 0) {
buf[--count] = convert2y[(v & NUMNICKMASK)];
v >>= NUMNICKLOG;
}
return buf;
}
static struct Client* FindXNServer(const char* numeric)
{
char buf[3];
buf[0] = *numeric++;
buf[1] = *numeric;
buf[2] = '\0';
Debug((DEBUG_DEBUG, "FindXNServer: %s(%d)", buf, base64toint(buf)));
return server_list[base64toint(buf)];
}
struct Client* FindNServer(const char* numeric)
{
unsigned int len = strlen(numeric);
if (len < 3) {
Debug((DEBUG_DEBUG, "FindNServer: %s(%d)", numeric, base64toint(numeric)));
return server_list[base64toint(numeric)];
}
else if (len == 3) {
Debug((DEBUG_DEBUG, "FindNServer: %c(%d)", *numeric,
convert2n[(unsigned char) *numeric]));
return server_list[convert2n[(unsigned char) *numeric]];
}
return FindXNServer(numeric);
}
struct Client* findNUser(const char* yxx)
{
struct Client* server = 0;
if (5 == strlen(yxx)) {
if (0 != (server = FindXNServer(yxx))) {
Debug((DEBUG_DEBUG, "findNUser: %s(%d)", yxx,
base64toint(yxx + 2) & cli_serv(server)->nn_mask));
return cli_serv(server)->client_list[base64toint(yxx + 2) & cli_serv(server)->nn_mask];
}
}
else if (0 != (server = FindNServer(yxx))) {
Debug((DEBUG_DEBUG, "findNUser: %s(%d)",
yxx, base64toint(yxx + 1) & cli_serv(server)->nn_mask));
return cli_serv(server)->client_list[base64toint(yxx + 1) & cli_serv(server)->nn_mask];
}
return 0;
}
void RemoveYXXClient(struct Client* server, const char* yxx)
{
assert(0 != server);
assert(0 != yxx);
if (*yxx) {
Debug((DEBUG_DEBUG, "RemoveYXXClient: %s(%d)", yxx,
base64toint(yxx) & cli_serv(server)->nn_mask));
cli_serv(server)->client_list[base64toint(yxx) & cli_serv(server)->nn_mask] = 0;
}
}
void SetServerYXX(struct Client* cptr, struct Client* server, const char* yxx)
{
unsigned int index;
if (5 == strlen(yxx)) {
ircd_strncpy(cli_yxx(server), yxx, 2);
ircd_strncpy(cli_serv(server)->nn_capacity, yxx + 2, 3);
}
else {
(cli_yxx(server))[0] = yxx[0];
cli_serv(server)->nn_capacity[0] = yxx[1];
cli_serv(server)->nn_capacity[1] = yxx[2];
}
cli_serv(server)->nn_mask = base64toint(cli_serv(server)->nn_capacity);
index = base64toint(cli_yxx(server));
if (index >= lastNNServer)
lastNNServer = index + 1;
server_list[index] = server;
/* Note, exit_one_client uses the fact that `client_list' != NULL to
* determine that SetServerYXX has been called - and then calls
* ClearServerYXX. However, freeing the allocation happens in free_client() */
cli_serv(server)->client_list =
(struct Client**) MyCalloc(cli_serv(server)->nn_mask + 1, sizeof(struct Client*));
}
void SetYXXCapacity(struct Client* c, unsigned int capacity)
{
unsigned int max_clients = 16;
/*
* Calculate mask to be used for the maximum number of clients
*/
while (max_clients < capacity)
max_clients <<= 1;
/*
* Sanity checks
*/
if (max_clients > NN_MAX_CLIENT) {
fprintf(stderr, "MAXCLIENTS (or MAXCONNECTIONS) is (at least) %d "
"too large ! Please decrease this value.\n",
max_clients - NN_MAX_CLIENT);
exit(-1);
}
--max_clients;
inttobase64(cli_serv(c)->nn_capacity, max_clients, 3);
cli_serv(c)->nn_mask = max_clients; /* Our Numeric Nick mask */
cli_serv(c)->client_list = (struct Client**) MyCalloc(max_clients + 1,
sizeof(struct Client*));
server_list[base64toint(cli_yxx(c))] = c;
}
void SetYXXServerName(struct Client* c, unsigned int numeric)
{
assert(0 != c);
assert(numeric < NN_MAX_SERVER);
inttobase64(cli_yxx(c), numeric, 2);
if (numeric >= lastNNServer)
lastNNServer = numeric + 1;
server_list[numeric] = c;
}
void ClearServerYXX(const struct Client *server)
{
unsigned int index = base64toint(cli_yxx(server));
if (server_list[index] == server) /* Sanity check */
server_list[index] = 0;
}
/*
* SetRemoteNumNick()
*
* Register numeric of new, remote, client.
* Add it to the appropriate client_list.
*/
void SetRemoteNumNick(struct Client* acptr, const char *yxx)
{
struct Client** acptrp;
struct Client* server = cli_user(acptr)->server;
if (5 == strlen(yxx)) {
strcpy(cli_yxx(acptr), yxx + 2);
}
else {
(cli_yxx(acptr))[0] = *++yxx;
(cli_yxx(acptr))[1] = *++yxx;
(cli_yxx(acptr))[2] = 0;
}
Debug((DEBUG_DEBUG, "SetRemoteNumNick: %s(%d)", cli_yxx(acptr),
base64toint(cli_yxx(acptr)) & cli_serv(server)->nn_mask));
acptrp = &(cli_serv(server))->client_list[base64toint(cli_yxx(acptr)) & cli_serv(server)->nn_mask];
if (*acptrp) {
/*
* this exits the old client in the array, not the client
* that is being set
*/
exit_client(cli_from(acptr), *acptrp, server, "Numeric nick collision (Ghost)");
}
*acptrp = acptr;
}
/*
* SetLocalNumNick()
*
* Register numeric of new, local, client. Add it to our client_list.
* Muxtex needed if threaded
*/
int SetLocalNumNick(struct Client *cptr)
{
static unsigned int last_nn = 0;
struct Client** client_list = cli_serv(&me)->client_list;
unsigned int mask = cli_serv(&me)->nn_mask;
unsigned int count = 0;
assert(cli_user(cptr)->server == &me);
while (client_list[last_nn & mask]) {
if (++count == NN_MAX_CLIENT) {
assert(count < NN_MAX_CLIENT);
return 0;
}
if (++last_nn == NN_MAX_CLIENT)
last_nn = 0;
}
client_list[last_nn & mask] = cptr; /* Reserve the numeric ! */
inttobase64(cli_yxx(cptr), last_nn, 3);
if (++last_nn == NN_MAX_CLIENT)
last_nn = 0;
return 1;
}
/*
* markMatchexServer()
* Mark all servers whose name matches the given (compiled) mask
* and return their count, abusing FLAG_MAP for this :)
*/
int markMatchexServer(const char *cmask, int minlen)
{
int cnt = 0;
int i;
struct Client *acptr;
for (i = 0; i < lastNNServer; i++) {
if ((acptr = server_list[i])) {
if (matchexec(cli_name(acptr), cmask, minlen))
ClrFlag(acptr, FLAG_MAP);
else {
SetFlag(acptr, FLAG_MAP);
cnt++;
}
}
}
return cnt;
}
struct Client* find_match_server(char *mask)
{
struct Client *acptr;
int i;
if (!(BadPtr(mask))) {
collapse(mask);
for (i = 0; i < lastNNServer; i++) {
if ((acptr = server_list[i]) && (!match(mask, cli_name(acptr))))
return acptr;
}
}
return 0;
}
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