--- /dev/null
+/*
+ * 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.
+ */
+/** @file
+ * @brief Implementation of numeric nickname operations.
+ * @version $Id$
+ */
+#include "config.h"
+
+#include "numnicks.h"
+#include "client.h"
+#include "ircd.h"
+#include "ircd_alloc.h"
+#include "ircd_log.h"
+#include "ircd_string.h"
+#include "match.h"
+#include "s_bsd.h"
+#include "s_debug.h"
+#include "s_misc.h"
+#include "struct.h"
+
+/* #include <assert.h> -- Now using assert in ircd_log.h */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+/** @page numnicks Numeric Nicks
+ * %Numeric nicks (numnicks) 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 5 character string: YYXXX
+ * Where 'YY' represents the server, and 'XXX' the nick on that server.
+ *
+ * 'YYXXX' should not interfere with the input parser, and therefore is
+ * not allowed to contain spaces or a ':'.
+ * Also, 'YY' can't start with a '+' because of m_server().
+ *
+ * We keep the characters printable for debugging reasons too.
+ *
+ * The 'XXX' value can be larger then the maximum number of clients
+ * per server, we use a mask (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 ! */
+
+/** Number of bits encoded in one numnick character. */
+#define NUMNICKLOG 6
+/** Bitmask to select value of next numnick character. */
+#define NUMNICKMASK 63 /* (NUMNICKBASE-1) */
+/** Number of servers representable in a numnick. */
+#define NN_MAX_SERVER 4096 /* (NUMNICKBASE * NUMNICKBASE) */
+/** Number of clients representable in a numnick. */
+#define NN_MAX_CLIENT 262144 /* NUMNICKBASE ^ 3 */
+
+/*
+ * The internal counter for the 'XX' of local clients
+ */
+/** Maximum used server numnick, plus one. */
+static unsigned int lastNNServer = 0;
+/** Array of servers indexed by numnick. */
+static struct Client* server_list[NN_MAX_SERVER];
+
+/* *INDENT-OFF* */
+
+/**
+ * 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 separator.
+ *
+ * ':' : 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','[',']'
+};
+
+/** Converts a character to its (base64) numnick value. */
+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* */
+
+/** Convert a string to its value as a numnick.
+ * @param[in] s Numnick string to decode.
+ * @return %Numeric nickname value.
+ */
+unsigned int base64toint(const char* s)
+{
+ unsigned int i = convert2n[(unsigned char) *s++];
+ while (*s) {
+ i <<= NUMNICKLOG;
+ i += convert2n[(unsigned char) *s++];
+ }
+ return i;
+}
+
+/** Encode a number as a numnick.
+ * @param[out] buf Output buffer.
+ * @param[in] v Value to encode.
+ * @param[in] count Number of numnick digits to write to \a buf.
+ */
+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;
+}
+
+/** Look up a server by numnick string.
+ * See @ref numnicks for more details.
+ * @param[in] numeric %Numeric nickname of server (may contain trailing junk).
+ * @return %Server with that numnick (or NULL).
+ */
+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)];
+}
+
+/** Look up a server by numnick string.
+ * See @ref numnicks for more details.
+ * @param[in] numeric %Numeric nickname of server.
+ * @return %Server with that numnick (or NULL).
+ */
+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);
+}
+
+/** Look up a user by numnick string.
+ * See @ref numnicks for more details.
+ * @param[in] yxx %Numeric nickname of user.
+ * @return %User with that numnick (or NULL).
+ */
+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;
+}
+
+/** Remove a client from a server's user array.
+ * @param[in] server %Server that owns the user to remove.
+ * @param[in] yxx Numnick of client to remove.
+ */
+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;
+ }
+}
+
+/** Set a server's numeric nick.
+ * @param[in] cptr %Client that announced the server (ignored).
+ * @param[in,out] server %Server that is being assigned a numnick.
+ * @param[in] yxx %Numeric nickname for server.
+ */
+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*));
+}
+
+/** Set a server's capacity.
+ * @param[in] c %Server whose capacity is being set.
+ * @param[in] capacity Maximum number of clients the server supports.
+ */
+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;
+}
+
+/** Set a server's numeric nick.
+ * See @ref numnicks for more details.
+ * @param[in] c %Server that is being assigned a numnick.
+ * @param[in] numeric Numnick value for server.
+ */
+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;
+}
+
+/** Unassign a server's numnick.
+ * @param[in] server %Server that should be removed from the numnick table.
+ */
+void ClearServerYXX(const struct Client *server)
+{
+ unsigned int index = base64toint(cli_yxx(server));
+ if (server_list[index] == server) /* Sanity check */
+ server_list[index] = 0;
+}
+
+/** Register numeric of new (remote) client.
+ * See @ref numnicks for more details.
+ * Add it to the appropriate client_list.
+ * @param[in] acptr %User being registered.
+ * @param[in] yxx User's numnick.
+ */
+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;
+}
+
+
+/** Register numeric of new (local) client.
+ * See @ref numnicks for more details.
+ * Assign a numnick and add it to our client_list.
+ * @param[in] cptr %User being registered.
+ */
+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;
+}
+
+/** Mark servers whose name matches the given (compiled) mask by
+ * setting their FLAG_MAP flag.
+ * @param[in] cmask Compiled mask for server names.
+ * @param[in] minlen Minimum match length for \a cmask.
+ * @return Number of servers marked.
+ */
+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;
+}
+
+/** Find first server whose name matches the given mask.
+ * @param[in,out] mask %Server name mask (collapse()d in-place).
+ * @return Matching server with lowest numnick value (or NULL).
+ */
+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;
+}
+
+/** Encode an IP address in the base64 used by numnicks.
+ * For IPv4 addresses (including IPv4-mapped and IPv4-compatible IPv6
+ * addresses), the 32-bit host address is encoded directly as six
+ * characters.
+ *
+ * For IPv6 addresses, each 16-bit address segment is encoded as three
+ * characters, but the longest run of zero segments is encoded using an
+ * underscore.
+ * @param[out] buf Output buffer to write to.
+ * @param[in] addr IP address to encode.
+ * @param[in] count Number of bytes writable to \a buf.
+ * @param[in] v6_ok If non-zero, peer understands base-64 encoded IPv6 addresses.
+ */
+const char* iptobase64(char* buf, const struct irc_in_addr* addr, unsigned int count, int v6_ok)
+{
+ if (irc_in_addr_is_ipv4(addr)) {
+ assert(count >= 6);
+ inttobase64(buf, (ntohs(addr->in6_16[6]) << 16) | ntohs(addr->in6_16[7]), 6);
+ } else if (!v6_ok) {
+ assert(count >= 6);
+ if (addr->in6_16[0] == htons(0x2002))
+ inttobase64(buf, (ntohs(addr->in6_16[1]) << 16) | ntohs(addr->in6_16[2]), 6);
+ else
+ strcpy(buf, "AAAAAA");
+ } else {
+ unsigned int max_start, max_zeros, curr_zeros, zero, ii;
+ char *output = buf;
+
+ assert(count >= 25);
+ /* Can start by printing out the leading non-zero parts. */
+ for (ii = 0; (addr->in6_16[ii]) && (ii < 8); ++ii) {
+ inttobase64(output, ntohs(addr->in6_16[ii]), 3);
+ output += 3;
+ }
+ /* Find the longest run of zeros. */
+ for (max_start = zero = ii, max_zeros = curr_zeros = 0; ii < 8; ++ii) {
+ if (!addr->in6_16[ii])
+ curr_zeros++;
+ else if (curr_zeros > max_zeros) {
+ max_start = ii - curr_zeros;
+ max_zeros = curr_zeros;
+ curr_zeros = 0;
+ }
+ }
+ if (curr_zeros > max_zeros) {
+ max_start = ii - curr_zeros;
+ max_zeros = curr_zeros;
+ curr_zeros = 0;
+ }
+ /* Print the rest of the address */
+ for (ii = zero; ii < 8; ) {
+ if ((ii == max_start) && max_zeros) {
+ *output++ = '_';
+ ii += max_zeros;
+ } else {
+ inttobase64(output, ntohs(addr->in6_16[ii]), 3);
+ output += 3;
+ ii++;
+ }
+ }
+ *output = '\0';
+ }
+ return buf;
+}
+
+/** Decode an IP address from base64.
+ * @param[in] input Input buffer to decode.
+ * @param[out] addr IP address structure to populate.
+ */
+void base64toip(const char* input, struct irc_in_addr* addr)
+{
+ memset(addr, 0, sizeof(*addr));
+ if (strlen(input) == 6) {
+ unsigned int in = base64toint(input);
+ /* An all-zero address should stay that way. */
+ if (in) {
+ addr->in6_16[5] = htons(65535);
+ addr->in6_16[6] = htons(in >> 16);
+ addr->in6_16[7] = htons(in & 65535);
+ }
+ } else {
+ unsigned int pos = 0;
+ do {
+ if (*input == '_') {
+ unsigned int left;
+ for (left = (25 - strlen(input)) / 3 - pos; left; left--)
+ addr->in6_16[pos++] = 0;
+ input++;
+ } else {
+ unsigned short accum = convert2n[(unsigned char)*input++];
+ accum = (accum << NUMNICKLOG) | convert2n[(unsigned char)*input++];
+ accum = (accum << NUMNICKLOG) | convert2n[(unsigned char)*input++];
+ addr->in6_16[pos++] = ntohs(accum);
+ }
+ } while (pos < 8);
+ }
+}
projects / ircu2.10.12-pk.git / blobdiff