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- /*
- * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2014 Alexander Barton (alex@barton.de) and Contributors.
- *
- * 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 of the License, or
- * (at your option) any later version.
- * Please read the file COPYING, README and AUTHORS for more information.
- */
- #define __client_c__
- #include "portab.h"
- /**
- * @file
- * Client management.
- */
- #include <assert.h>
- #include <unistd.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <strings.h>
- #include <time.h>
- #include <netdb.h>
- #include "conn.h"
- #include "ngircd.h"
- #include "channel.h"
- #include "conf.h"
- #include "conn-func.h"
- #include "hash.h"
- #include "irc-write.h"
- #include "log.h"
- #include "match.h"
- #include "messages.h"
- #define GETID_LEN (CLIENT_NICK_LEN-1) + 1 + (CLIENT_USER_LEN-1) + 1 + (CLIENT_HOST_LEN-1) + 1
- static CLIENT *This_Server, *My_Clients;
- static WHOWAS My_Whowas[MAX_WHOWAS];
- static int Last_Whowas = -1;
- static long Max_Users, My_Max_Users;
- static unsigned long Count PARAMS(( CLIENT_TYPE Type ));
- static unsigned long MyCount PARAMS(( CLIENT_TYPE Type ));
- static CLIENT *New_Client_Struct PARAMS(( void ));
- static void Generate_MyToken PARAMS(( CLIENT *Client ));
- static void Adjust_Counters PARAMS(( CLIENT *Client ));
- static void Free_Client PARAMS(( CLIENT **Client ));
- static CLIENT *Init_New_Client PARAMS((CONN_ID Idx, CLIENT *Introducer,
- CLIENT *TopServer, int Type, const char *ID,
- const char *User, const char *Hostname, const char *Info,
- int Hops, int Token, const char *Modes,
- bool Idented));
- static void Destroy_UserOrService PARAMS((CLIENT *Client,const char *Txt, const char *FwdMsg,
- bool SendQuit));
- static void cb_introduceClient PARAMS((CLIENT *Client, CLIENT *Prefix,
- void *i));
- GLOBAL void
- Client_Init( void )
- {
- struct hostent *h;
-
- This_Server = New_Client_Struct( );
- if( ! This_Server )
- {
- Log( LOG_EMERG, "Can't allocate client structure for server! Going down." );
- Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
- exit( 1 );
- }
- /* Client structure for this server */
- This_Server->next = NULL;
- This_Server->type = CLIENT_SERVER;
- This_Server->conn_id = NONE;
- This_Server->introducer = This_Server;
- This_Server->mytoken = 1;
- This_Server->hops = 0;
- gethostname( This_Server->host, CLIENT_HOST_LEN );
- if (Conf_DNS) {
- h = gethostbyname( This_Server->host );
- if (h) strlcpy(This_Server->host, h->h_name, sizeof(This_Server->host));
- }
- Client_SetID( This_Server, Conf_ServerName );
- Client_SetInfo( This_Server, Conf_ServerInfo );
- My_Clients = This_Server;
-
- memset( &My_Whowas, 0, sizeof( My_Whowas ));
- } /* Client_Init */
- GLOBAL void
- Client_Exit( void )
- {
- CLIENT *c, *next;
- int cnt;
- if( NGIRCd_SignalRestart ) Client_Destroy( This_Server, "Server going down (restarting).", NULL, false );
- else Client_Destroy( This_Server, "Server going down.", NULL, false );
-
- cnt = 0;
- c = My_Clients;
- while(c) {
- cnt++;
- next = (CLIENT *)c->next;
- Free_Client(&c);
- c = next;
- }
- if (cnt)
- Log(LOG_INFO, "Freed %d client structure%s.",
- cnt, cnt == 1 ? "" : "s");
- } /* Client_Exit */
- GLOBAL CLIENT *
- Client_ThisServer( void )
- {
- return This_Server;
- } /* Client_ThisServer */
- /**
- * Initialize new local client; wrapper function for Init_New_Client().
- * @return New CLIENT structure.
- */
- GLOBAL CLIENT *
- Client_NewLocal(CONN_ID Idx, const char *Hostname, int Type, bool Idented)
- {
- return Init_New_Client(Idx, This_Server, NULL, Type, NULL, NULL,
- Hostname, NULL, 0, 0, NULL, Idented);
- } /* Client_NewLocal */
- /**
- * Initialize new remote server; wrapper function for Init_New_Client().
- * @return New CLIENT structure.
- */
- GLOBAL CLIENT *
- Client_NewRemoteServer(CLIENT *Introducer, const char *Hostname, CLIENT *TopServer,
- int Hops, int Token, const char *Info, bool Idented)
- {
- return Init_New_Client(NONE, Introducer, TopServer, CLIENT_SERVER,
- Hostname, NULL, Hostname, Info, Hops, Token, NULL, Idented);
- } /* Client_NewRemoteServer */
- /**
- * Initialize new remote client; wrapper function for Init_New_Client().
- * @return New CLIENT structure.
- */
- GLOBAL CLIENT *
- Client_NewRemoteUser(CLIENT *Introducer, const char *Nick, int Hops, const char *User,
- const char *Hostname, int Token, const char *Modes, const char *Info, bool Idented)
- {
- return Init_New_Client(NONE, Introducer, NULL, CLIENT_USER, Nick,
- User, Hostname, Info, Hops, Token, Modes, Idented);
- } /* Client_NewRemoteUser */
- /**
- * Initialize new client and set up the given parameters like client type,
- * user name, host name, introducing server etc. ...
- * @return New CLIENT structure.
- */
- static CLIENT *
- Init_New_Client(CONN_ID Idx, CLIENT *Introducer, CLIENT *TopServer,
- int Type, const char *ID, const char *User, const char *Hostname,
- const char *Info, int Hops, int Token, const char *Modes, bool Idented)
- {
- CLIENT *client;
- assert(Idx >= NONE);
- assert(Introducer != NULL);
- client = New_Client_Struct();
- if (!client)
- return NULL;
- client->starttime = time(NULL);
- client->conn_id = Idx;
- client->introducer = Introducer;
- client->topserver = TopServer;
- client->type = Type;
- if (ID)
- Client_SetID(client, ID);
- if (User) {
- Client_SetUser(client, User, Idented);
- Client_SetOrigUser(client, User);
- }
- if (Hostname)
- Client_SetHostname(client, Hostname);
- if (Info)
- Client_SetInfo(client, Info);
- client->hops = Hops;
- client->token = Token;
- if (Modes)
- Client_SetModes(client, Modes);
- if (Type == CLIENT_SERVER)
- Generate_MyToken(client);
- if (Client_HasMode(client, 'a'))
- client->away = strndup(DEFAULT_AWAY_MSG, CLIENT_AWAY_LEN - 1);
- client->next = (POINTER *)My_Clients;
- My_Clients = client;
- Adjust_Counters(client);
- return client;
- } /* Init_New_Client */
- GLOBAL void
- Client_Destroy( CLIENT *Client, const char *LogMsg, const char *FwdMsg, bool SendQuit )
- {
- /* remove a client */
-
- CLIENT *last, *c;
- char msg[COMMAND_LEN];
- const char *txt;
- assert( Client != NULL );
- txt = LogMsg ? LogMsg : FwdMsg;
- if (!txt)
- txt = "Reason unknown";
- /* netsplit message */
- if( Client->type == CLIENT_SERVER ) {
- strlcpy(msg, This_Server->id, sizeof (msg));
- strlcat(msg, " ", sizeof (msg));
- strlcat(msg, Client->id, sizeof (msg));
- }
- last = NULL;
- c = My_Clients;
- while( c )
- {
- if(( Client->type == CLIENT_SERVER ) && ( c->introducer == Client ) && ( c != Client ))
- {
- /*
- * The client that is about to be removed is a server,
- * the client we are checking right now is a child of that
- * server and thus has to be removed, too.
- *
- * Call Client_Destroy() recursively with the server as the
- * new "object to be removed". This starts the cycle again, until
- * all servers that are linked via the original server have been
- * removed.
- */
- Client_Destroy( c, NULL, msg, false );
- last = NULL;
- c = My_Clients;
- continue;
- }
- if( c == Client )
- {
- /* found the client: remove it */
- if( last ) last->next = c->next;
- else My_Clients = (CLIENT *)c->next;
- if(c->type == CLIENT_USER || c->type == CLIENT_SERVICE)
- Destroy_UserOrService(c, txt, FwdMsg, SendQuit);
- else if( c->type == CLIENT_SERVER )
- {
- if (c != This_Server) {
- if (c->conn_id != NONE)
- Log(LOG_NOTICE|LOG_snotice,
- "Server \"%s\" unregistered (connection %d): %s.",
- c->id, c->conn_id, txt);
- else
- Log(LOG_NOTICE|LOG_snotice,
- "Server \"%s\" unregistered: %s.",
- c->id, txt);
- }
- /* inform other servers */
- if( ! NGIRCd_SignalQuit )
- {
- if( FwdMsg ) IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "SQUIT %s :%s", c->id, FwdMsg );
- else IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "SQUIT %s :", c->id );
- }
- }
- else
- {
- if (c->conn_id != NONE) {
- if (c->id[0])
- Log(LOG_NOTICE,
- "Client \"%s\" unregistered (connection %d): %s.",
- c->id, c->conn_id, txt);
- else
- Log(LOG_NOTICE,
- "Client unregistered (connection %d): %s.",
- c->conn_id, txt);
- } else {
- Log(LOG_WARNING,
- "Unregistered unknown client \"%s\": %s",
- c->id[0] ? c->id : "(No Nick)", txt);
- }
- }
- Free_Client(&c);
- break;
- }
- last = c;
- c = (CLIENT *)c->next;
- }
- } /* Client_Destroy */
- /**
- * Set client hostname.
- *
- * If global hostname cloaking is in effect, don't set the real hostname
- * but the configured one.
- *
- * @param Client The client of which the hostname should be set.
- * @param Hostname The new hostname.
- */
- GLOBAL void
- Client_SetHostname( CLIENT *Client, const char *Hostname )
- {
- assert(Client != NULL);
- assert(Hostname != NULL);
- if (Conf_CloakHost[0]) {
- char cloak[GETID_LEN];
- strlcpy(cloak, Hostname, GETID_LEN);
- strlcat(cloak, Conf_CloakHostSalt, GETID_LEN);
- snprintf(cloak, GETID_LEN, Conf_CloakHost, Hash(cloak));
- LogDebug("Updating hostname of \"%s\": \"%s\" -> \"%s\"",
- Client_ID(Client), Client->host, cloak);
- strlcpy(Client->host, cloak, sizeof(Client->host));
- } else {
- LogDebug("Updating hostname of \"%s\": \"%s\" -> \"%s\"",
- Client_ID(Client), Client->host, Hostname);
- strlcpy(Client->host, Hostname, sizeof(Client->host));
- }
- } /* Client_SetHostname */
- /**
- * Set IP address to display for a client.
- *
- * @param Client The client.
- * @param IPAText Textual representation of the IP address or NULL to unset.
- */
- GLOBAL void
- Client_SetIPAText(CLIENT *Client, const char *IPAText)
- {
- assert(Client != NULL);
- if (Client->ipa_text)
- free(Client->ipa_text);
- if (*IPAText)
- Client->ipa_text = strndup(IPAText, CLIENT_HOST_LEN - 1);
- else
- Client->ipa_text = NULL;
- }
- GLOBAL void
- Client_SetID( CLIENT *Client, const char *ID )
- {
- assert( Client != NULL );
- assert( ID != NULL );
-
- strlcpy( Client->id, ID, sizeof( Client->id ));
- if (Conf_CloakUserToNick) {
- strlcpy( Client->user, ID, sizeof( Client->user ));
- strlcpy( Client->info, ID, sizeof( Client->info ));
- }
- /* Hash */
- Client->hash = Hash( Client->id );
- } /* Client_SetID */
- GLOBAL void
- Client_SetUser( CLIENT *Client, const char *User, bool Idented )
- {
- /* set clients username */
- assert( Client != NULL );
- assert( User != NULL );
- if (Conf_CloakUserToNick) {
- strlcpy(Client->user, Client->id, sizeof(Client->user));
- } else if (Idented) {
- strlcpy(Client->user, User, sizeof(Client->user));
- } else {
- Client->user[0] = '~';
- strlcpy(Client->user + 1, User, sizeof(Client->user) - 1);
- }
- } /* Client_SetUser */
- /**
- * Set "original" user name of a client.
- * This function saves the "original" user name, the user name specified by
- * the peer using the USER command, into the CLIENT structure. This user
- * name may be used for authentication, for example.
- * @param Client The client.
- * @param User User name to set.
- */
- GLOBAL void
- Client_SetOrigUser(CLIENT UNUSED *Client, const char UNUSED *User)
- {
- assert(Client != NULL);
- assert(User != NULL);
- #if defined(PAM)
- strlcpy(Client->orig_user, User, sizeof(Client->orig_user));
- #endif
- } /* Client_SetOrigUser */
- GLOBAL void
- Client_SetInfo( CLIENT *Client, const char *Info )
- {
- /* set client hostname */
- assert( Client != NULL );
- assert( Info != NULL );
- if (Conf_CloakUserToNick)
- strlcpy(Client->info, Client->id, sizeof(Client->info));
- else
- strlcpy(Client->info, Info, sizeof(Client->info));
- } /* Client_SetInfo */
- GLOBAL void
- Client_SetModes( CLIENT *Client, const char *Modes )
- {
- assert( Client != NULL );
- assert( Modes != NULL );
- strlcpy(Client->modes, Modes, sizeof( Client->modes ));
- } /* Client_SetModes */
- GLOBAL void
- Client_SetFlags( CLIENT *Client, const char *Flags )
- {
- assert( Client != NULL );
- assert( Flags != NULL );
- strlcpy(Client->flags, Flags, sizeof(Client->flags));
- } /* Client_SetFlags */
- GLOBAL void
- Client_SetAccountName(CLIENT *Client, const char *AccountName)
- {
- assert(Client != NULL);
- if (Client->account_name)
- free(Client->account_name);
- if (*AccountName)
- Client->account_name = strndup(AccountName,
- CLIENT_NICK_LEN - 1);
- else
- Client->account_name = NULL;
- }
- GLOBAL void
- Client_SetAway( CLIENT *Client, const char *Txt )
- {
- /* Set AWAY reason of client */
- assert( Client != NULL );
- assert( Txt != NULL );
- if (Client->away)
- free(Client->away);
- Client->away = strndup(Txt, CLIENT_AWAY_LEN - 1);
- LogDebug("%s \"%s\" is away: %s", Client_TypeText(Client),
- Client_Mask(Client), Txt);
- } /* Client_SetAway */
- GLOBAL void
- Client_SetType( CLIENT *Client, int Type )
- {
- assert( Client != NULL );
- Client->type = Type;
- if( Type == CLIENT_SERVER ) Generate_MyToken( Client );
- Adjust_Counters( Client );
- } /* Client_SetType */
- GLOBAL void
- Client_SetHops( CLIENT *Client, int Hops )
- {
- assert( Client != NULL );
- Client->hops = Hops;
- } /* Client_SetHops */
- GLOBAL void
- Client_SetToken( CLIENT *Client, int Token )
- {
- assert( Client != NULL );
- Client->token = Token;
- } /* Client_SetToken */
- GLOBAL void
- Client_SetIntroducer( CLIENT *Client, CLIENT *Introducer )
- {
- assert( Client != NULL );
- assert( Introducer != NULL );
- Client->introducer = Introducer;
- } /* Client_SetIntroducer */
- GLOBAL bool
- Client_ModeAdd( CLIENT *Client, char Mode )
- {
- /* Set Mode.
- * If Client already had Mode, return false.
- * If the Mode was newly set, return true.
- */
- char x[2];
- assert( Client != NULL );
- x[0] = Mode; x[1] = '\0';
- if (!Client_HasMode(Client, x[0])) {
- strlcat( Client->modes, x, sizeof( Client->modes ));
- return true;
- }
- else return false;
- } /* Client_ModeAdd */
- GLOBAL bool
- Client_ModeDel( CLIENT *Client, char Mode )
- {
- /* Delete Mode.
- * If Mode was removed, return true.
- * If Client did not have Mode, return false.
- */
- char x[2], *p;
- assert( Client != NULL );
- x[0] = Mode; x[1] = '\0';
- p = strchr( Client->modes, x[0] );
- if( ! p ) return false;
- /* Client has Mode -> delete */
- while( *p )
- {
- *p = *(p + 1);
- p++;
- }
- return true;
- } /* Client_ModeDel */
- /**
- * Search CLIENT structure of a given nick name.
- *
- * @return Pointer to CLIENT structure or NULL if not found.
- */
- GLOBAL CLIENT *
- Client_Search( const char *Nick )
- {
- char search_id[CLIENT_ID_LEN], *ptr;
- CLIENT *c = NULL;
- UINT32 search_hash;
- assert( Nick != NULL );
- /* copy Nick and truncate hostmask if necessary */
- strlcpy( search_id, Nick, sizeof( search_id ));
- ptr = strchr( search_id, '!' );
- if( ptr ) *ptr = '\0';
- search_hash = Hash(search_id);
- c = My_Clients;
- while (c) {
- if (c->hash == search_hash && strcasecmp(c->id, search_id) == 0)
- return c;
- c = (CLIENT *)c->next;
- }
- return NULL;
- }
- /**
- * Search first CLIENT structure matching a given mask of a server.
- *
- * The order of servers is arbitrary, but this function makes sure that the
- * local server is always returned if the mask matches it.
- *
- * @return Pointer to CLIENT structure or NULL if no server could be found.
- */
- GLOBAL CLIENT *
- Client_SearchServer(const char *Mask)
- {
- CLIENT *c;
- assert(Mask != NULL);
- /* First check if mask matches the local server */
- if (MatchCaseInsensitive(Mask, Client_ID(Client_ThisServer())))
- return Client_ThisServer();
- c = My_Clients;
- while (c) {
- if (Client_Type(c) == CLIENT_SERVER) {
- /* This is a server: check if Mask matches */
- if (MatchCaseInsensitive(Mask, c->id))
- return c;
- }
- c = (CLIENT *)c->next;
- }
- return NULL;
- }
- /**
- * Get client structure ("introducer") identfied by a server token.
- * @return CLIENT structure or NULL if none could be found.
- */
- GLOBAL CLIENT *
- Client_GetFromToken( CLIENT *Client, int Token )
- {
- CLIENT *c;
- assert( Client != NULL );
- if (!Token)
- return NULL;
- c = My_Clients;
- while (c) {
- if ((c->type == CLIENT_SERVER) && (c->introducer == Client) &&
- (c->token == Token))
- return c;
- c = (CLIENT *)c->next;
- }
- return NULL;
- } /* Client_GetFromToken */
- GLOBAL int
- Client_Type( CLIENT *Client )
- {
- assert( Client != NULL );
- return Client->type;
- } /* Client_Type */
- GLOBAL CONN_ID
- Client_Conn( CLIENT *Client )
- {
- assert( Client != NULL );
- return Client->conn_id;
- } /* Client_Conn */
- GLOBAL char *
- Client_ID( CLIENT *Client )
- {
- assert( Client != NULL );
- #ifdef DEBUG
- if(Client->type == CLIENT_USER)
- assert(strlen(Client->id) < Conf_MaxNickLength);
- #endif
-
- if( Client->id[0] ) return Client->id;
- else return "*";
- } /* Client_ID */
- GLOBAL char *
- Client_Info( CLIENT *Client )
- {
- assert( Client != NULL );
- return Client->info;
- } /* Client_Info */
- GLOBAL char *
- Client_User( CLIENT *Client )
- {
- assert( Client != NULL );
- return Client->user[0] ? Client->user : "~";
- } /* Client_User */
- #ifdef PAM
- /**
- * Get the "original" user name as supplied by the USER command.
- * The user name as given by the client is used for authentication instead
- * of the one detected using IDENT requests.
- * @param Client The client.
- * @return Original user name.
- */
- GLOBAL char *
- Client_OrigUser(CLIENT *Client) {
- return Client->orig_user;
- } /* Client_OrigUser */
- #endif
- /**
- * Return the hostname of a client.
- * @param Client Pointer to client structure
- * @return Pointer to client hostname
- */
- GLOBAL char *
- Client_Hostname(CLIENT *Client)
- {
- assert (Client != NULL);
- return Client->host;
- }
- /**
- * Return the cloaked hostname of a client, if set.
- * @param Client Pointer to the client structure.
- * @return Pointer to the cloaked hostname or NULL if not set.
- */
- GLOBAL char *
- Client_HostnameCloaked(CLIENT *Client)
- {
- assert(Client != NULL);
- return Client->cloaked;
- }
- /**
- * Get (potentially cloaked) hostname of a client to display it to other users.
- *
- * If the client has not enabled cloaking, the real hostname is used.
- *
- * @param Client Pointer to client structure
- * @return Pointer to client hostname
- */
- GLOBAL char *
- Client_HostnameDisplayed(CLIENT *Client)
- {
- assert(Client != NULL);
- /* Client isn't cloaked at all, return real hostname: */
- if (!Client_HasMode(Client, 'x'))
- return Client_Hostname(Client);
- /* Use an already saved cloaked hostname, if there is one */
- if (Client->cloaked)
- return Client->cloaked;
- Client_UpdateCloakedHostname(Client, NULL, NULL);
- return Client->cloaked;
- }
- GLOBAL const char *
- Client_IPAText(CLIENT *Client)
- {
- assert(Client != NULL);
- /* Not a local client? */
- if (Client_Conn(Client) <= NONE)
- return "0.0.0.0";
- if (!Client->ipa_text)
- return Conn_GetIPAInfo(Client_Conn(Client));
- else
- return Client->ipa_text;
- }
- /**
- * Update (and generate, if necessary) the cloaked hostname of a client.
- *
- * The newly set cloaked hostname is announced in the network using METADATA
- * commands to peers that support this feature.
- *
- * @param Client The client of which the cloaked hostname should be updated.
- * @param Origin The originator of the hostname change, or NULL if this server.
- * @param Hostname The new cloaked hostname, or NULL if it should be generated.
- */
- GLOBAL void
- Client_UpdateCloakedHostname(CLIENT *Client, CLIENT *Origin,
- const char *Hostname)
- {
- char Cloak_Buffer[CLIENT_HOST_LEN];
- assert(Client != NULL);
- if (!Origin)
- Origin = Client_ThisServer();
- if (!Client->cloaked) {
- Client->cloaked = malloc(CLIENT_HOST_LEN);
- if (!Client->cloaked)
- return;
- }
- if (!Hostname) {
- /* Generate new cloaked hostname */
- if (*Conf_CloakHostModeX) {
- strlcpy(Cloak_Buffer, Client->host,
- sizeof(Cloak_Buffer));
- strlcat(Cloak_Buffer, Conf_CloakHostSalt,
- sizeof(Cloak_Buffer));
- snprintf(Client->cloaked, CLIENT_HOST_LEN,
- Conf_CloakHostModeX, Hash(Cloak_Buffer));
- } else
- strlcpy(Client->cloaked, Client_ID(Client->introducer),
- CLIENT_HOST_LEN);
- } else
- strlcpy(Client->cloaked, Hostname, CLIENT_HOST_LEN);
- LogDebug("Cloaked hostname of \"%s\" updated to \"%s\"",
- Client_ID(Client), Client->cloaked);
- /* Inform other servers in the network */
- IRC_WriteStrServersPrefixFlag(Client_NextHop(Origin), Origin, 'M',
- "METADATA %s cloakhost :%s",
- Client_ID(Client), Client->cloaked);
- }
- GLOBAL char *
- Client_Modes( CLIENT *Client )
- {
- assert( Client != NULL );
- return Client->modes;
- } /* Client_Modes */
- GLOBAL char *
- Client_Flags( CLIENT *Client )
- {
- assert( Client != NULL );
- return Client->flags;
- } /* Client_Flags */
- GLOBAL int
- Client_Hops( CLIENT *Client )
- {
- assert( Client != NULL );
- return Client->hops;
- } /* Client_Hops */
- GLOBAL int
- Client_Token( CLIENT *Client )
- {
- assert( Client != NULL );
- return Client->token;
- } /* Client_Token */
- GLOBAL int
- Client_MyToken( CLIENT *Client )
- {
- assert( Client != NULL );
- return Client->mytoken;
- } /* Client_MyToken */
- GLOBAL CLIENT *
- Client_NextHop( CLIENT *Client )
- {
- CLIENT *c;
- assert( Client != NULL );
- c = Client;
- while( c->introducer && ( c->introducer != c ) && ( c->introducer != This_Server ))
- c = c->introducer;
- return c;
- } /* Client_NextHop */
- /**
- * Return ID of a client: "client!user@host"
- * This client ID is used for IRC prefixes, for example.
- * Please note that this function uses a global static buffer, so you can't
- * nest invocations without overwriting earlier results!
- * @param Client Pointer to client structure
- * @return Pointer to global buffer containing the client ID
- */
- GLOBAL char *
- Client_Mask( CLIENT *Client )
- {
- static char Mask_Buffer[GETID_LEN];
- assert (Client != NULL);
- /* Servers: return name only, there is no "mask" */
- if (Client->type == CLIENT_SERVER)
- return Client->id;
- snprintf(Mask_Buffer, GETID_LEN, "%s!%s@%s",
- Client->id, Client->user, Client->host);
- return Mask_Buffer;
- } /* Client_Mask */
- /**
- * Return ID of a client with cloaked hostname: "client!user@server-name"
- *
- * This client ID is used for IRC prefixes, for example.
- * Please note that this function uses a global static buffer, so you can't
- * nest invocations without overwriting earlier results!
- * If the client has not enabled cloaking, the real hostname is used.
- *
- * @param Client Pointer to client structure
- * @return Pointer to global buffer containing the client ID
- */
- GLOBAL char *
- Client_MaskCloaked(CLIENT *Client)
- {
- static char Mask_Buffer[GETID_LEN];
- assert (Client != NULL);
- /* Is the client using cloaking at all? */
- if (!Client_HasMode(Client, 'x'))
- return Client_Mask(Client);
- snprintf(Mask_Buffer, GETID_LEN, "%s!%s@%s", Client->id, Client->user,
- Client_HostnameDisplayed(Client));
- return Mask_Buffer;
- } /* Client_MaskCloaked */
- GLOBAL CLIENT *
- Client_Introducer( CLIENT *Client )
- {
- assert( Client != NULL );
- return Client->introducer;
- } /* Client_Introducer */
- GLOBAL CLIENT *
- Client_TopServer( CLIENT *Client )
- {
- assert( Client != NULL );
- return Client->topserver;
- } /* Client_TopServer */
- GLOBAL bool
- Client_HasMode( CLIENT *Client, char Mode )
- {
- assert( Client != NULL );
- return strchr( Client->modes, Mode ) != NULL;
- } /* Client_HasMode */
- GLOBAL bool
- Client_HasFlag( CLIENT *Client, char Flag )
- {
- assert( Client != NULL );
- return strchr( Client->flags, Flag ) != NULL;
- } /* Client_HasFlag */
- GLOBAL char *
- Client_Away( CLIENT *Client )
- {
- assert( Client != NULL );
- return Client->away;
- } /* Client_Away */
- GLOBAL char *
- Client_AccountName(CLIENT *Client)
- {
- assert(Client != NULL);
- return Client->account_name;
- }
- /**
- * Make sure that a given nickname is valid.
- *
- * If the nickname is not valid for the given client, this function sends back
- * the appropriate error messages.
- *
- * @param Client Client that wants to change the nickname.
- * @param Nick New nickname.
- * @returns true if nickname is valid, false otherwise.
- */
- GLOBAL bool
- Client_CheckNick(CLIENT *Client, char *Nick)
- {
- assert(Client != NULL);
- assert(Nick != NULL);
- if (!Client_IsValidNick(Nick)) {
- if (strlen(Nick ) >= Conf_MaxNickLength)
- IRC_WriteErrClient(Client, ERR_NICKNAMETOOLONG_MSG,
- Client_ID(Client), Nick,
- Conf_MaxNickLength - 1);
- else
- IRC_WriteErrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
- Client_ID(Client), Nick);
- return false;
- }
- if (Client_Type(Client) != CLIENT_SERVER
- && Client_Type(Client) != CLIENT_SERVICE) {
- /* Make sure that this isn't a restricted/forbidden nickname */
- if (Conf_NickIsBlocked(Nick)) {
- IRC_WriteErrClient(Client, ERR_FORBIDDENNICKNAME_MSG,
- Client_ID(Client), Nick);
- return false;
- }
- }
- /* Nickname already registered? */
- if (Client_Search(Nick)) {
- IRC_WriteErrClient(Client, ERR_NICKNAMEINUSE_MSG,
- Client_ID(Client), Nick);
- return false;
- }
- return true;
- } /* Client_CheckNick */
- GLOBAL bool
- Client_CheckID( CLIENT *Client, char *ID )
- {
- char str[COMMAND_LEN];
- CLIENT *c;
- assert( Client != NULL );
- assert( Client->conn_id > NONE );
- assert( ID != NULL );
- /* ID too long? */
- if (strlen(ID) > CLIENT_ID_LEN) {
- IRC_WriteErrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
- Client_ID(Client), ID);
- return false;
- }
- /* ID already in use? */
- c = My_Clients;
- while (c) {
- if (strcasecmp(c->id, ID) == 0) {
- snprintf(str, sizeof(str), "ID \"%s\" already registered", ID);
- if (c->conn_id != NONE)
- Log(LOG_ERR, "%s (on connection %d)!", str, c->conn_id);
- else
- Log(LOG_ERR, "%s (via network)!", str);
- Conn_Close(Client->conn_id, str, str, true);
- return false;
- }
- c = (CLIENT *)c->next;
- }
- return true;
- } /* Client_CheckID */
- GLOBAL CLIENT *
- Client_First( void )
- {
- return My_Clients;
- } /* Client_First */
- GLOBAL CLIENT *
- Client_Next( CLIENT *c )
- {
- assert( c != NULL );
- return (CLIENT *)c->next;
- } /* Client_Next */
- GLOBAL long
- Client_UserCount( void )
- {
- return Count( CLIENT_USER );
- } /* Client_UserCount */
- GLOBAL long
- Client_ServiceCount( void )
- {
- return Count( CLIENT_SERVICE );;
- } /* Client_ServiceCount */
- GLOBAL long
- Client_ServerCount( void )
- {
- return Count( CLIENT_SERVER );
- } /* Client_ServerCount */
- GLOBAL long
- Client_MyUserCount( void )
- {
- return MyCount( CLIENT_USER );
- } /* Client_MyUserCount */
- GLOBAL long
- Client_MyServiceCount( void )
- {
- return MyCount( CLIENT_SERVICE );
- } /* Client_MyServiceCount */
- GLOBAL unsigned long
- Client_MyServerCount( void )
- {
- CLIENT *c;
- unsigned long cnt = 0;
- c = My_Clients;
- while( c )
- {
- if(( c->type == CLIENT_SERVER ) && ( c->hops == 1 )) cnt++;
- c = (CLIENT *)c->next;
- }
- return cnt;
- } /* Client_MyServerCount */
- GLOBAL unsigned long
- Client_OperCount( void )
- {
- CLIENT *c;
- unsigned long cnt = 0;
- c = My_Clients;
- while( c )
- {
- if (c && c->type == CLIENT_USER && Client_HasMode(c, 'o' ))
- cnt++;
- c = (CLIENT *)c->next;
- }
- return cnt;
- } /* Client_OperCount */
- GLOBAL unsigned long
- Client_UnknownCount( void )
- {
- CLIENT *c;
- unsigned long cnt = 0;
- c = My_Clients;
- while( c )
- {
- if( c && ( c->type != CLIENT_USER ) && ( c->type != CLIENT_SERVICE ) && ( c->type != CLIENT_SERVER )) cnt++;
- c = (CLIENT *)c->next;
- }
- return cnt;
- } /* Client_UnknownCount */
- GLOBAL long
- Client_MaxUserCount( void )
- {
- return Max_Users;
- } /* Client_MaxUserCount */
- GLOBAL long
- Client_MyMaxUserCount( void )
- {
- return My_Max_Users;
- } /* Client_MyMaxUserCount */
- /**
- * Check that a given nickname is valid.
- *
- * @param Nick the nickname to check.
- * @returns true if nickname is valid, false otherwise.
- */
- GLOBAL bool
- Client_IsValidNick(const char *Nick)
- {
- const char *ptr;
- static const char goodchars[] = ";0123456789-";
- assert (Nick != NULL);
- if (strchr(goodchars, Nick[0]))
- return false;
- if (strlen(Nick ) >= Conf_MaxNickLength)
- return false;
- ptr = Nick;
- while (*ptr) {
- if (*ptr < 'A' && !strchr(goodchars, *ptr ))
- return false;
- if (*ptr > '}')
- return false;
- ptr++;
- }
- return true;
- } /* Client_IsValidNick */
- /**
- * Return pointer to "My_Whowas" structure.
- */
- GLOBAL WHOWAS *
- Client_GetWhowas( void )
- {
- return My_Whowas;
- } /* Client_GetWhowas */
- /**
- * Return the index of the last used WHOWAS entry.
- */
- GLOBAL int
- Client_GetLastWhowasIndex( void )
- {
- return Last_Whowas;
- } /* Client_GetLastWhowasIndex */
- /**
- * Get the start time of this client.
- * The result is the start time in seconds since 1970-01-01, as reported
- * by the C function time(NULL).
- */
- GLOBAL time_t
- Client_StartTime(CLIENT *Client)
- {
- assert( Client != NULL );
- return Client->starttime;
- } /* Client_Uptime */
- /**
- * Reject a client when logging in.
- *
- * This function is called when a client isn't allowed to connect to this
- * server. Possible reasons are bad server password, bad PAM password,
- * or that the client is G/K-Line'd.
- *
- * After calling this function, the client isn't connected any more.
- *
- * @param Client The client to reject.
- * @param Reason The reason why the client has been rejected.
- * @param InformClient If true, send the exact reason to the client.
- */
- GLOBAL void
- Client_Reject(CLIENT *Client, const char *Reason, bool InformClient)
- {
- char info[COMMAND_LEN];
- assert(Client != NULL);
- assert(Reason != NULL);
- if (InformClient)
- snprintf(info, sizeof(info), "Access denied: %s", Reason);
- else
- strcpy(info, "Access denied: Bad password?");
- Log(LOG_ERR,
- "User \"%s\" rejected (connection %d): %s!",
- Client_Mask(Client), Client_Conn(Client), Reason);
- Conn_Close(Client_Conn(Client), Reason, info, true);
- }
- /**
- * Introduce a new user or service client in the network.
- *
- * @param From Remote server introducing the client or NULL (local).
- * @param Client New client.
- * @param Type Type of the client (CLIENT_USER or CLIENT_SERVICE).
- */
- GLOBAL void
- Client_Introduce(CLIENT *From, CLIENT *Client, int Type)
- {
- /* Set client type (user or service) */
- Client_SetType(Client, Type);
- if (From) {
- if (Conf_NickIsService(Conf_GetServer(Client_Conn(From)),
- Client_ID(Client)))
- Client_SetType(Client, CLIENT_SERVICE);
- LogDebug("%s \"%s\" (+%s) registered (via %s, on %s, %d hop%s).",
- Client_TypeText(Client), Client_Mask(Client),
- Client_Modes(Client), Client_ID(From),
- Client_ID(Client_Introducer(Client)),
- Client_Hops(Client), Client_Hops(Client) > 1 ? "s": "");
- } else {
- Log(LOG_NOTICE, "%s \"%s\" registered (connection %d).",
- Client_TypeText(Client), Client_Mask(Client),
- Client_Conn(Client));
- Log_ServerNotice('c', "Client connecting: %s (%s@%s) [%s] - %s",
- Client_ID(Client), Client_User(Client),
- Client_Hostname(Client),
- Conn_IPA(Client_Conn(Client)),
- Client_TypeText(Client));
- }
- /* Inform other servers */
- IRC_WriteStrServersPrefixFlag_CB(From,
- From != NULL ? From : Client_ThisServer(),
- '\0', cb_introduceClient, (void *)Client);
- } /* Client_Introduce */
- static unsigned long
- Count( CLIENT_TYPE Type )
- {
- CLIENT *c;
- unsigned long cnt = 0;
- c = My_Clients;
- while( c )
- {
- if( c->type == Type ) cnt++;
- c = (CLIENT *)c->next;
- }
- return cnt;
- } /* Count */
- static unsigned long
- MyCount( CLIENT_TYPE Type )
- {
- CLIENT *c;
- unsigned long cnt = 0;
- c = My_Clients;
- while( c )
- {
- if(( c->introducer == This_Server ) && ( c->type == Type )) cnt++;
- c = (CLIENT *)c->next;
- }
- return cnt;
- } /* MyCount */
- /**
- * Allocate and initialize new CLIENT strcuture.
- *
- * @return Pointer to CLIENT structure or NULL on error.
- */
- static CLIENT *
- New_Client_Struct( void )
- {
- CLIENT *c;
- c = (CLIENT *)malloc( sizeof( CLIENT ));
- if( ! c )
- {
- Log( LOG_EMERG, "Can't allocate memory! [New_Client_Struct]" );
- return NULL;
- }
- memset( c, 0, sizeof ( CLIENT ));
- c->type = CLIENT_UNKNOWN;
- c->conn_id = NONE;
- c->hops = -1;
- c->token = -1;
- c->mytoken = -1;
- return c;
- }
- /**
- * Free a CLIENT structure and its member variables.
- */
- static void
- Free_Client(CLIENT **Client)
- {
- assert(Client != NULL);
- assert(*Client != NULL);
- if ((*Client)->account_name)
- free((*Client)->account_name);
- if ((*Client)->away)
- free((*Client)->away);
- if ((*Client)->cloaked)
- free((*Client)->cloaked);
- if ((*Client)->ipa_text)
- free((*Client)->ipa_text);
- free(*Client);
- *Client = NULL;
- }
- static void
- Generate_MyToken( CLIENT *Client )
- {
- CLIENT *c;
- int token;
- c = My_Clients;
- token = 2;
- while( c )
- {
- if( c->mytoken == token )
- {
- /* The token is already in use */
- token++;
- c = My_Clients;
- continue;
- }
- else c = (CLIENT *)c->next;
- }
- Client->mytoken = token;
- LogDebug("Assigned token %d to server \"%s\".", token, Client->id);
- } /* Generate_MyToken */
- static void
- Adjust_Counters( CLIENT *Client )
- {
- long count;
- assert( Client != NULL );
- if( Client->type != CLIENT_USER ) return;
- if( Client->conn_id != NONE )
- {
- /* Local connection */
- count = Client_MyUserCount( );
- if( count > My_Max_Users ) My_Max_Users = count;
- }
- count = Client_UserCount( );
- if( count > Max_Users ) Max_Users = count;
- } /* Adjust_Counters */
- /**
- * Register client in My_Whowas structure for further recall by WHOWAS.
- * Note: Only clients that have been connected at least 30 seconds will be
- * registered to prevent automated IRC bots to "destroy" a nice server
- * history database.
- */
- GLOBAL void
- Client_RegisterWhowas( CLIENT *Client )
- {
- int slot;
- time_t now;
- assert( Client != NULL );
- /* Don't register WHOWAS information when "MorePrivacy" is enabled. */
- if (Conf_MorePrivacy)
- return;
- now = time(NULL);
- /* Don't register clients that were connected less than 30 seconds. */
- if( now - Client->starttime < 30 )
- return;
- slot = Last_Whowas + 1;
- if( slot >= MAX_WHOWAS || slot < 0 ) slot = 0;
- #ifdef DEBUG
- Log( LOG_DEBUG, "Saving WHOWAS information to slot %d ...", slot );
- #endif
- My_Whowas[slot].time = now;
- strlcpy( My_Whowas[slot].id, Client_ID( Client ),
- sizeof( My_Whowas[slot].id ));
- strlcpy( My_Whowas[slot].user, Client_User( Client ),
- sizeof( My_Whowas[slot].user ));
- strlcpy( My_Whowas[slot].host, Client_HostnameDisplayed( Client ),
- sizeof( My_Whowas[slot].host ));
- strlcpy( My_Whowas[slot].info, Client_Info( Client ),
- sizeof( My_Whowas[slot].info ));
- strlcpy( My_Whowas[slot].server, Client_ID( Client_Introducer( Client )),
- sizeof( My_Whowas[slot].server ));
- Last_Whowas = slot;
- } /* Client_RegisterWhowas */
- GLOBAL const char *
- Client_TypeText(CLIENT *Client)
- {
- assert(Client != NULL);
- switch (Client_Type(Client)) {
- case CLIENT_USER:
- return "User";
- break;
- case CLIENT_SERVICE:
- return "Service";
- break;
- case CLIENT_SERVER:
- return "Server";
- break;
- default:
- return "Client";
- }
- } /* Client_TypeText */
- /**
- * Destroy user or service client.
- */
- static void
- Destroy_UserOrService(CLIENT *Client, const char *Txt, const char *FwdMsg, bool SendQuit)
- {
- if(Client->conn_id != NONE) {
- /* Local (directly connected) client */
- Log(LOG_NOTICE,
- "%s \"%s\" unregistered (connection %d): %s.",
- Client_TypeText(Client), Client_Mask(Client),
- Client->conn_id, Txt);
- Log_ServerNotice('c', "Client exiting: %s (%s@%s) [%s]",
- Client_ID(Client), Client_User(Client),
- Client_Hostname(Client), Txt);
- if (SendQuit) {
- /* Inforam all the other servers */
- if (FwdMsg)
- IRC_WriteStrServersPrefix(NULL,
- Client, "QUIT :%s", FwdMsg );
- else
- IRC_WriteStrServersPrefix(NULL,
- Client, "QUIT :");
- }
- } else {
- /* Remote client */
- LogDebug("%s \"%s\" unregistered: %s.",
- Client_TypeText(Client), Client_Mask(Client), Txt);
- if(SendQuit) {
- /* Inform all the other servers, but the ones in the
- * direction we got the QUIT from */
- if(FwdMsg)
- IRC_WriteStrServersPrefix(Client_NextHop(Client),
- Client, "QUIT :%s", FwdMsg );
- else
- IRC_WriteStrServersPrefix(Client_NextHop(Client),
- Client, "QUIT :" );
- }
- }
- /* Unregister client from channels */
- Channel_Quit(Client, FwdMsg ? FwdMsg : Client->id);
- /* Register client in My_Whowas structure */
- Client_RegisterWhowas(Client);
- } /* Destroy_UserOrService */
- /**
- * Introduce a new user or service client to a remote server.
- *
- * @param To The remote server to inform.
- * @param Prefix Prefix for the generated commands.
- * @param data CLIENT structure of the new client.
- */
- static void
- cb_introduceClient(CLIENT *To, CLIENT *Prefix, void *data)
- {
- CLIENT *c = (CLIENT *)data;
- (void)Client_Announce(To, Prefix, c);
- } /* cb_introduceClient */
- /**
- * Announce an user or service to a server.
- *
- * This function differentiates between RFC1459 and RFC2813 server links and
- * generates the appropriate commands to register the user or service.
- *
- * @param Client Server
- * @param Prefix Prefix for the generated commands
- * @param User User to announce
- */
- GLOBAL bool
- Client_Announce(CLIENT * Client, CLIENT * Prefix, CLIENT * User)
- {
- CONN_ID conn;
- char *modes, *user, *host;
- modes = Client_Modes(User);
- user = Client_User(User) ? Client_User(User) : "-";
- host = Client_Hostname(User) ? Client_Hostname(User) : "-";
- conn = Client_Conn(Client);
- if (Conn_Options(conn) & CONN_RFC1459) {
- /* RFC 1459 mode: separate NICK and USER commands */
- if (! Conn_WriteStr(conn, "NICK %s :%d",
- Client_ID(User), Client_Hops(User) + 1))
- return DISCONNECTED;
- if (! Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
- Client_ID(User), user, host,
- Client_ID(Client_Introducer(User)),
- Client_Info(User)))
- return DISCONNECTED;
- if (modes[0]) {
- if (! Conn_WriteStr(conn, ":%s MODE %s +%s",
- Client_ID(User), Client_ID(User),
- modes))
- return DISCONNECTED;
- }
- } else {
- /* RFC 2813 mode: one combined NICK or SERVICE command */
- if (Client_Type(User) == CLIENT_SERVICE
- && Client_HasFlag(Client, 'S')) {
- if (!IRC_WriteStrClientPrefix(Client, Prefix,
- "SERVICE %s %d * +%s %d :%s",
- Client_Mask(User),
- Client_MyToken(Client_Introducer(User)),
- modes, Client_Hops(User) + 1,
- Client_Info(User)))
- return DISCONNECTED;
- } else {
- if (!IRC_WriteStrClientPrefix(Client, Prefix,
- "NICK %s %d %s %s %d +%s :%s",
- Client_ID(User), Client_Hops(User) + 1,
- user, host,
- Client_MyToken(Client_Introducer(User)),
- modes, Client_Info(User)))
- return DISCONNECTED;
- }
- }
- if (Client_HasFlag(Client, 'M')) {
- /* Synchronize metadata */
- if (Client_HostnameCloaked(User)) {
- if (!IRC_WriteStrClientPrefix(Client, Prefix,
- "METADATA %s cloakhost :%s",
- Client_ID(User),
- Client_HostnameCloaked(User)))
- return DISCONNECTED;
- }
- if (Client_AccountName(User)) {
- if (!IRC_WriteStrClientPrefix(Client, Prefix,
- "METADATA %s accountname :%s",
- Client_ID(User),
- Client_AccountName(User)))
- return DISCONNECTED;
- }
- if (Conn_GetCertFp(Client_Conn(User))) {
- if (!IRC_WriteStrClientPrefix(Client, Prefix,
- "METADATA %s certfp :%s",
- Client_ID(User),
- Conn_GetCertFp(Client_Conn(User))))
- return DISCONNECTED;
- }
- }
- return CONNECTED;
- } /* Client_Announce */
- #ifdef DEBUG
- GLOBAL void
- Client_DebugDump(void)
- {
- CLIENT *c;
- Log(LOG_DEBUG, "Client status:");
- c = My_Clients;
- while (c) {
- Log(LOG_DEBUG,
- " - %s: type=%d, host=%s, user=%s, conn=%d, start=%ld, flags=%s",
- Client_ID(c), Client_Type(c), Client_Hostname(c),
- Client_User(c), Client_Conn(c), Client_StartTime(c),
- Client_Flags(c));
- c = (CLIENT *)c->next;
- }
- } /* Client_DumpClients */
- #endif
- /* -eof- */
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