/* trircd protocol module for IRC Services.
 * Provided by Yusuf Iskenderoglu <uhc0@stud.uni-karlsruhe.de>
 *
 * IRC Services is copyright (c) 1996-2009 Andrew Church.
 *     E-mail: <achurch@achurch.org>
 * Parts written by Andrew Kempe and others.
 * This program is free but copyrighted software; see the file COPYING for
 * details.
 */

#include "services.h"
#include "modules.h"
#include "conffile.h"
#include "language.h"
#include "messages.h"
#include "modules/chanserv/chanserv.h"
#include "modules/operserv/operserv.h"
#include "modules/nickserv/nickserv.h"

#include "banexcept.h"
#include "chanprot.h"
#include "halfop.h"
#include "invitemask.h"
#include "sjoin.h"
#include "svsnick.h"
#include "token.h"

/*************************************************************************/

static Module *module;
static Module *module_operserv;
static Module *module_chanserv;

static char *NetworkDomain = NULL;

/*
 * We import `s_ChanServ' from the "chanserv/main" module; this variable  
 * holds a pointer to `s_ChanServ', obtained via get_module_symbol().  When
 * the ChanServ module is not loaded, this holds a pointer to `ServerName'
 * instead as a default value.
 *
 * Note that we use a #define here to substitute `*p_s_ChanServ' for
 * `s_ChanServ', so subsequent code can simply use `s_ChanServ' as if it
 * were declared normally.
 */

static char **p_s_ChanServ = &ServerName;
#define s_ChanServ (*p_s_ChanServ)


/*************************************************************************/
/***************** Local interface to external routines ******************/
/*************************************************************************/

static typeof(is_services_admin) *p_is_services_admin = NULL;
static int local_is_services_admin(User *u) {
    return p_is_services_admin && (*p_is_services_admin)(u);
}
#define is_services_admin local_is_services_admin

static typeof(get_channelinfo) *p_get_channelinfo = NULL;
static ChannelInfo *local_get_channelinfo(const char *name) {
    return p_get_channelinfo ? (*p_get_channelinfo)(name) : NULL;
}
#define get_channelinfo local_get_channelinfo

static typeof(first_channelinfo) *p_first_channelinfo = NULL;
static ChannelInfo *local_first_channelinfo(void) {
    return p_first_channelinfo ? (*p_first_channelinfo)() : NULL;
}
#define first_channelinfo local_first_channelinfo

static typeof(next_channelinfo) *p_next_channelinfo = NULL;
static ChannelInfo *local_next_channelinfo(void) {
    return p_next_channelinfo ? (*p_next_channelinfo)() : NULL;
}
#define next_channelinfo local_next_channelinfo

/*************************************************************************/
/************************** User/channel modes ***************************/
/*************************************************************************/

struct modedata_init {
    uint8 mode;
    ModeData data;
};

static const struct modedata_init new_usermodes[] = {
    {'g', {0x00000008}},	/* Receive globops */
    {'h', {0x00000010}},	/* Helpop */
    {'r', {0x00000020,0,0,0,MI_REGISTERED}},
				/* Registered nick */
    {'a', {0x00000040}},	/* Services admin */
    {'A', {0x00000080}},	/* Server admin */
    {'x', {0x00000100}},	/* Mask hostname */
    {'R', {0x00000200}},	/* Do not receive text from unregged nicks */
    {'L', {0x00000400}},	/* Nick language has been set */
    {'c', {0x00000800}},	/* No color in private messages */
    {'C', {0x00001000}},	/* No CTCPs in private messages */
    {'H', {0x00002000}},	/* User can see realhost, secret channels */
    {'p', {0x00004000}},	/* Hide idle time in /whois */
    {'P', {0x00008000}},	/* Do not receive private messages */
    {'t', {0x00010000}},	/* Greek->Greeklish translation active */
    {'z', {0x00020000}},	/* Dccallow all users */
};

static const struct modedata_init new_chanmodes[] = {
    {'R', {0x00000100,0,0,0,MI_REGNICKS_ONLY}},
				/* Only identified users can join */
    {'r', {0x00000200,0,0,0,MI_REGISTERED}},
				/* Set for all registered channels */
    {'c', {0x00000400,0,0}},	/* No ANSI colors in channel */
    {'O', {0x00000800,0,0,0,MI_OPERS_ONLY}},
				/* Only opers can join channel */
    {'T', {0x00001000,0,0}},	/* /topic only by protected (+a) */
    {'x', {0x00002000,0,0}},	/* Hide ops (show no .@%+ prefixes) */
    {'N', {0x00004000,0,0}},	/* No clients with unresolved hostnames */
    {'d', {0x00008000,0,0}},	/* Hide part/quit reasons */
    {'f', {0x00010000,1,0}},    /* Flood limit */
    {'C', {0x00020000,0,0}},	/* No CTCP in channel */
    {'g', {0x00040000,0,0}}, 	/* Only registered nicks can talk */
    {'j', {0x00080000,0,0}},	/* /names only by members */
    {'L', {0x00100000,1,0}},	/* Channel link */
    {'K', {0x00200000,0,0}},	/* No knock */
    {'J', {0x00400000,1,0}},	/* /join delay */
    {'I', {0x80000000,1,1,0,MI_MULTIPLE}}, /* INVITE hosts */
    {'e', {0x80000000,1,1,0,MI_MULTIPLE}}, /* ban exceptions */
    {'M', {0x80000000,1,1,0,MI_MULTIPLE}}, /* moderated hosts */
    {'z', {0x80000000,1,1,0,MI_MULTIPLE}}, /* zapped channels */
};

static const struct modedata_init new_chanusermodes[] = {
    {'h', {0x00000004,1,1,'%'}},        /* Half-op */
    {'a', {0x00000008,1,1,'~'}},        /* Protected (no kick or deop by +o) */
    {'u', {0x00000010,1,1,'.',MI_CHANOWNER}},
					/* Channel owner */
};

static void init_modes(void)
{
    int i;

    for (i = 0; i < lenof(new_usermodes); i++)
	usermodes[new_usermodes[i].mode] = new_usermodes[i].data;
    for (i = 0; i < lenof(new_chanmodes); i++)
	chanmodes[new_chanmodes[i].mode] = new_chanmodes[i].data;
    for (i = 0; i < lenof(new_chanusermodes); i++)
	chanusermodes[new_chanusermodes[i].mode] = new_chanusermodes[i].data;

    mode_setup();
};

/*************************************************************************/

/* Language hash values (for usermode +L) */

#define HASH_MODULUS	387

static int langhash[NUM_LANGS];
static struct {
    int lang;
    const char *str;
} langhash_init[] = {
    { LANG_EN_US,	"English"	},
    { LANG_JA_EUC,	"Japanese-EUC"	},
    { LANG_JA_SJIS,	"Japanese-SJIS"	},
    { LANG_ES,		"Espa\361ol"	},
    { LANG_PT,		"Portugues"	},
    { LANG_FR,		"French"	},
    { LANG_TR,		"Turkce"	},
    { LANG_NL,		"Nederlands"	},
    { LANG_DE,		"Deutsch"	},
    { LANG_IT,		"Italian"	},
    { LANG_HU,		"Magyar"	},
};

static void init_langhash()
{
    int i;

    memset(langhash, 0, sizeof(langhash));
    for (i = 0; i < lenof(langhash_init); i++) {
	int hashval = 0;
	const unsigned char *s = (const unsigned char *)langhash_init[i].str;
	while (*s)
	    hashval += *s++ & 0xDF;
	langhash[langhash_init[i].lang] = hashval % HASH_MODULUS;
    }
}

/*************************************************************************/
/************************* IRC message receiving *************************/
/*************************************************************************/

/* Please note that the new CLIENT string of TRIRCD-5 cannot be supported
 * unless ircservices implements identity management of Bahamut 1.6 series.
 * Therefore, the good old NICK line with the IP will be used. -TimeMr14C */

static void m_nick(char *source, int ac, char **av)
{
    char *newmodes, *fakehost, ipbuf[16], *s;
    uint32 ip;

    if (*source) {
	/* Old user changing nicks. */
	if (ac != 2) {
	    if (debug)
		module_log("debug: NICK message: wrong number of parameters"
			   " (%d) for source `%s'", ac, source);
	} else {
	    do_nick(source, ac, av);
	}
	return;
    }

    /* New user. */

    if (ac != 11) {
	if (debug)
	    module_log("debug: NICK message: wrong number of parameters (%d)"
		       " for new user", ac);
	return;
    }

    /* With Bahamut, new users get modes in the NICK message.  Save the
     * modes and strip the parameter out. */
    newmodes = av[3];
    memmove(&av[3], &av[4], sizeof(char *) * 7); 
    ac--;

    fakehost = av[5];
    memmove(&av[5], &av[6], sizeof(char *) * 4);
    ac--;    

    /* Convert IP address from 32 bit integer to string format */
    ip = strtoul(av[7], &s, 10);
    if (*s) {
	wallops(NULL,
		"\2WARNING\2: invalid IP address `%s' for new nick %s",
		av[7], av[0]);
	module_log("WARNING: invalid IP address `%s' for new nick %s",
		   av[7], av[0]);
	s = NULL;
    } else if (!ip && find_module("operserv/sline")) {
	static int warned_no_nickip = 0;
	if (!warned_no_nickip) {
	    wallops(NULL,
		    "\2WARNING\2: missing IP address for new nick %s."
		    "  Make sure you have no pre-4.0 servers on your"
		    " network, or SZLINEs will not work correctly.",
		    av[0]);
	    warned_no_nickip = 1;
	}
	module_log("WARNING: missing IP address for new nick %s", av[0]);
	s = strcpy(ipbuf, "0.0.0.0");
    } else {
	uint8 rawip[4];
	rawip[0] = ip>>24;
	rawip[1] = ip>>16;
	rawip[2] = ip>>8;
	rawip[3] = ip;
	s = unpack_ip(rawip);
	if (!s || strlen(s) > sizeof(ipbuf)-1) {
	    /* super duper paranoia */
	    module_log("WARNING: unpack_ip() returned overlong or null"
		       " string: %s", s ? s : "(null)");
	    s = NULL;
	} else {
	    strcpy(ipbuf, s);  /* safe: we checked length above */
	    s = ipbuf;
	}
    }

    /* Rearrange parameters for do_nick() (IP address is in `s') */
    av[7] = av[6];
    av[6] = av[8];
    av[8] = s;

    /* Move fakehost into user argument area */
    av[9] = fakehost;

    if (do_nick(source, ac, av)) {
	av[1] = newmodes;
	do_umode(av[0], 2, av);
    }
}

/*************************************************************************/

static void m_sjoin(char *source, int ac, char **av)
{
    if (ac == 3 || ac < 2) {
	if (debug)
	    module_log("debug: SJOIN: expected 2 or >=4 params, got %d", ac);
	return;
    }
    do_sjoin(source, ac, av);
}

/*************************************************************************/

static void m_capab(char *source, int ac, char **av)
{
    int got_trircd5 = 0, got_excap = 0;
    int i;

    for (i = 0; i < ac; i++) {
	if (stricmp(av[i], "TRIRCD5") == 0) {
	    got_trircd5 = 1;
	} else if (stricmp(av[i], "EXCAP") == 0) {
	    got_excap = 1;
	}
    }
    if (!got_trircd5 || !got_excap) {
	send_error("Only trircd 5.5 and later are supported");
	strscpy(quitmsg, "Remote server version is not 5.5 or later",
		sizeof(quitmsg));
	quitting = 1;
    }
}

static void m_excap(char *source, int ac, char **av)
{
    char *s;

    if (ac < 1)
	return;
    for (s = strtok(av[0]," "); s != NULL; s = strtok(NULL," ")) {
	if (stricmp(s, "CHANLINK") == 0) {
	}
    }
}

/*************************************************************************/

static void m_svinfo(char *source, int ac, char **av)
{
    /* -TimeMr14C
     * Obviously we do need to send an initial PING, regardless of the
     * reality that services may be configured to send pings if there is
     * low traffic. Additionally, to comply with the TRIRCD Extensions, we
     * do set the topic of the services logging channel.
     */  

    send_cmd(NULL, "PING :%s", ServerName);
    send_cmd(NULL, "TOPIC #services DevNull %ld :Services Logging channel", (long)time(NULL)); 
}

/*************************************************************************/

static void m_tmode(char *source, int ac, char **av)
{
    if (ac < 3) {
	if (debug)
	    module_log("debug: TMODE: expected >=3 params, got %d", ac);
	return;
    }
    memmove(av+1, av+2, sizeof(char *) * (ac-1));
    do_cmode(source, ac-1, av);
}

/*************************************************************************/

static Message trircd_messages[] = {
    { "ADMINS",    NULL },
    { "AKILL",     NULL },
    { "CAPAB",     m_capab },
    { "CLIENT",    NULL },
    { "DENYTEXT",  NULL },
    { "EWHOIS",    NULL },
    { "EXCAP",     m_excap },
    { "EXCLUDE",   NULL },
    { "GLINE",     NULL },
    { "GLOBOPS",   NULL },
    { "GNOTICE",   NULL },
    { "GOPER",     NULL },
    { "HASH",      NULL },
    { "JUPITER",   NULL },
    { "KNOCK",     NULL },
    { "MYID",      NULL },
    { "NETHTM",    NULL },
    { "NETSET",    NULL },
    { "NICK",      m_nick },
    { "RAKILL",    NULL },
    { "REXCLUDE",  NULL },
    { "REXCOM",    NULL },
    { "RNOTICE",   NULL },
    { "RPING",     NULL },
    { "RPUNG",     NULL },
    { "SADMINS",   NULL },
    { "SGLINE",    NULL },
    { "SILENCE",   NULL },
    { "SJOIN",     m_sjoin },
    { "SQLINE",    NULL },
    { "SVINFO",    m_svinfo },
    { "SZLINE",    NULL },
    { "TMODE",     m_tmode },
    { "UNDENYTEXT",NULL },
    { "UNGLINE",   NULL },
    { "UNJUPITER", NULL },
    { "UNSGLINE",  NULL },
    { "UNSQLINE",  NULL },
    { "UNSZLINE",  NULL },
    { NULL }
};

static TokenInfo trircd5_tokens[] = {  
    /* 0x21 */
    { "!",  NULL },
    { "\"", NULL },
    { "#",  NULL },
    { "$",  NULL },
    { "%",  NULL },
    { "&",  NULL },   
    { "'",  NULL },
    { "(",  NULL },
    { ")",  NULL },
    { "*",  NULL },
    { "+",  NULL },
    { ",",  "EWHOIS" },
    { "-",  NULL },
    { ".",  NULL },
    { "/",  NULL },

    /* 0x30 */
    { "0",  NULL },
    { "1",  "SVSKILL" },
    { "2",  "SVSMODE" },
    { "3",  "SVSNICK" },
    { "4",  "SVSNOOP" },
    { "5",  "SGLINE" },
    { "6",  "UNSGLINE" },       
    { "7",  "UNSZLINE" },
    { "8",  NULL },
    { "9",  NULL },
    { ":",  NULL },
    { ";",  NULL },
    { "<",  "ADMINS" },
    { "=",  "MYID" },
    { ">",  "SADMINS" },
    { "?",  "STATS" },

    /* 0x40 */
    { "@",  "LUSERS" },
    { "A",  "AWAY" },
    { "B",  "BURST" },
    { "C",  "JUPITER" },
    { "D",  "UNJUPE" }, 
    { "E",  "ERROR" },
    { "F",  "GLINE" },   
    { "G",  "GNOTICE" },
    { "H",  "CLIENT" },
    { "I",  "INVITE" },
    { "J",  "JOIN" },
    { "K",  "KICK" },
    { "L",  "GLOBOPS" },
    { "M",  "MODE" },
    { "N",  "NICK" },
    { "O",  "SQUERY" },

    /* 0x50 */
    { "P",  "PRIVMSG" },
    { "Q",  "QUIT" },
    { "R",  "RAKILL" },
    { "S",  "SJOIN" },
    { "T",  "TOPIC" },
    { "U",  "UNSQLINE" },
    { "V",  "NETSET" },
    { "W",  "WHOIS" },
    { "X",  "SERVICE" },
    { "Y",  "INFO" },
    { "Z",  "ZLINE" },
    { "[",  "RPING" },
    { "\\", "USERS" },
    { "]",  "RPONG" },
    { "^",  NULL },
    { "_",  "DENYTEXT" },

    /* 0x60 */
    { "`",  "UNDENYTEXT" },
    { "a",  "AKILL" },
    { "b",  "SVSJOIN" },
    { "c",  "CONNECT" },
    { "d",  "ADMIN" },
    { "e",  "EXCLUDE" },
    { "f",  "PING" },
    { "g",  "GOPER" },
    { "h",  "SILENCE" },
    { "i",  "TIME" },
    { "j",  "REXCLUDE" },
    { "k",  "KILL" },
    { "l",  "WALLOPS" },
    { "m",  "MOTD" },
    { "n",  "NOTICE" },
    { "o",  NULL },

    /* 0x70 */
    { "p",  "PART" },
    { "q",  "SQUIT" },
    { "r",  "RNOTICE" },
    { "s",  "SERVER" },
    { "t",  "TRACE" },
    { "u",  "PONG" },
    { "v",  "VERSION" },
    { "w",  "WHOWAS" },
    { "x",  "SQLINE" },
    { "y",  "UNGLINE" },
    { "z",  "SVINFO" },
    { "{",  "KNOCK" },
    { "|",  "REXCOM" },
    { "}",  NULL },
    { "~",  "TMODE" },

    { NULL }
};

/*************************************************************************/
/************************** IRC message sending **************************/
/*************************************************************************/

/* Send a NICK command for a new user. */

static void do_send_nick(const char *nick, const char *user, const char *host,
			 const char *server, const char *name,
			 const char *modes)
{
    /* NICK <nick> <hops> <TS> <umode> <user> <host> <server> <svsid>
     *      :<ircname> */
    send_cmd(NULL, "NICK %s 1 %ld +%s %s %s %s %s 0 0 :%s", nick,
	     (long)time(NULL), modes, user, host, host, server, name);
}

/*************************************************************************/

/* Send a NICK command to change an existing user's nick. */

static void do_send_nickchange(const char *nick, const char *newnick)
{
    send_cmd(nick, "NICK %s %ld", newnick, (long)time(NULL));
}

/*************************************************************************/

/* Send a command to change a user's "real name". */

static void do_send_namechange(const char *nick, const char *newname)
{
    /* Not supported by this protocol. */
}

/*************************************************************************/

/* Send a SERVER command, and anything else needed at the beginning of the
 * connection.
 */

static void do_send_server(void)
{
    send_cmd(NULL, "PASS %s :TS7", RemotePassword);
    /* for 5.7 only: send_cmd(NULL, "CAPAB NICKIP TOKEN1 EXCAP"); */
    send_cmd(NULL, "CAPAB TS3 NOQUIT SSJOIN NICKIP DT1 EX-REX TOKEN1 TMODE EXCAP");
    send_cmd(NULL, "EXCAP :CHANLINK");
    send_cmd(NULL, "SERVER %s 1 :%s", ServerName, ServerDesc);
    send_cmd(NULL, "SVINFO 3 3 0 :%ld", (long)time(NULL));
}

/*************************************************************************/

/* Send a SERVER command for a remote (juped) server. */

/* Even with TRIRCD5, services does not need supporting the new SERVER
 * line, where identity and capability parameters are also sent. 
 * 1) Services does not need to know, who is also ULined.
 * 2) Services does not support servername hiding.
 * 3) Services does not do network rerouting.
 * So are both parameters unnecessary and old SERVER line will be used.
 * -TimeMr14C */

static void do_send_server_remote(const char *server, const char *reason)
{
    send_cmd(NULL, "SERVER %s 2 :%s", server, reason);
}

/*************************************************************************/

/* Send a WALLOPS (really a GLOBOPS). */

static void do_wallops(const char *source, const char *fmt, ...)
{
    va_list args;
    char buf[BUFSIZE];

    va_start(args, fmt);
    vsnprintf(buf, sizeof(buf), fmt, args);
    va_end(args);
    send_cmd(source ? source : ServerName, "GLOBOPS :%s", buf);
}

/*************************************************************************/

/* Send a NOTICE to all users on the network. */

static void do_notice_all(const char *source, const char *fmt, ...)
{
    va_list args;
    char msgbuf[BUFSIZE];

    va_start(args, fmt);
    vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
    va_end(args);
    if (NetworkDomain) {
	send_cmd(source, "NOTICE $*.%s :%s", NetworkDomain, msgbuf);
    } else {
	/* Go through all common top-level domains.  If you have others,
	 * add them here. */
	send_cmd(source, "NOTICE $*.com :%s", msgbuf);
	send_cmd(source, "NOTICE $*.net :%s", msgbuf);
	send_cmd(source, "NOTICE $*.org :%s", msgbuf);
	send_cmd(source, "NOTICE $*.edu :%s", msgbuf);
    }
}

/*************************************************************************/

/* Send a command which modifies channel status. */

static void do_send_channel_cmd(const char *source, const char *fmt, ...)
{
    va_list args;

    va_start(args, fmt);
    vsend_cmd(source, fmt, args);
    va_end(args);
}

/*************************************************************************/
/******************************* Callbacks *******************************/
/*************************************************************************/

static int do_connect(void)
{
    /* Send MODEs to the server for all channels locked +L, in case the
     * servers aren't aware of them. */

    ChannelInfo *ci;

    for (ci = first_channelinfo(); ci; ci = next_channelinfo()) {
	if ((ci->mlock_on & mode_char_to_flag('L',MODE_CHANNEL))
	 && ci->mlock_link
	) {
	    send_cmd(s_ChanServ, "MODE %s +L %s", ci->name, ci->mlock_link);
	}
    }
    return 0;
}

/*************************************************************************/

static int do_receive_message(const char *source, const char *cmd, int ac,
			      char **av)
{
    /* Watch for MODE +/-L's for nonexistent channels, and:
     *    (1) reverse them if necessary
     *    (2) don't generate "no such channel" error messages for them
     */
    char *s;
    ChannelInfo *ci;
    int add;
    int modeL; /* status of +/-L wrt this message (1:on, 0:off, -1:not seen) */
    int lockL; /* status of MLOCK +/-L (1:+L, 0:-L) */

    if (stricmp(cmd,"MODE") != 0 || ac < 2 || av[0][0] != '#'
     || get_channel(av[0])  /* existing channels will get handled normally */
     || !(ci = get_channelinfo(av[0]))
    ) {
	return 0;
    }
    if ((ci->mlock_on & mode_char_to_flag('L',MODE_CHANNEL)) && ci->mlock_link)
	lockL = 1;
    else if (ci->mlock_off & mode_char_to_flag('L',MODE_CHANNEL))
	lockL = 0;
    else
	return 0;
    add = -1;
    modeL = -1;
    for (s = av[1]; *s; s++) {
	if (*s == '+') {
	    add = 1;
	} else if (*s == '-') {
	    add = 0;
	} else if (*s == 'L') {
	    if (add < 0) {
		module_log("Invalid MODE message from server: MODE %s",
			   merge_args(ac,av));
		return 0;
	    } else {
		modeL = add;
	    }
	}
    }
    if (modeL == -1)
	return 0;
    if (modeL != lockL) {
	if (lockL) {
	    /* ci->mlock_link checked above */
	    send_cmd(s_ChanServ, "MODE %s +L %s", av[0], ci->mlock_link);
	} else {
	    send_cmd(s_ChanServ, "MODE %s -L", av[0]);
	}
    }
    return 1;  /* don't let the main code see it and say "no such channel" */
}

/*************************************************************************/

static int do_user_create(User *user, int ac, char **av)
{
    user->fakehost = sstrdup(av[9]);
    return 0;
}

/*************************************************************************/

static int do_user_servicestamp_change(User *user)
{
    send_cmd(ServerName, "SVSMODE %s +d %ld",
	     user->nick, (long)user->servicestamp);
    return 0;
}

/*************************************************************************/

static int do_user_mode(User *user, int modechar, int add, char **av)
{
    switch (modechar) {
      case 'd':
	module_log("MODE tried to change services stamp for %s", user->nick);
	send_cmd(ServerName, "SVSMODE %s +d %u", user->nick,
		 user->servicestamp);
	return 0;

      case 'o':
	if (add) {
	    user->mode |= UMODE_o;
	    if (add && user_identified(user) && is_services_admin(user))
		send_cmd(ServerName, "SVSMODE %s +a", user->nick);
	    user->mode &= ~UMODE_o;
	}
	return 0;

      case 'r':
	if (user_identified(user)) {
	    if (!add)
		send_cmd(ServerName, "SVSMODE %s +r", user->nick);
	} else {
	    if (add)
		send_cmd(ServerName, "SVSMODE %s -r", user->nick);
	}
	return 1;

      case 'a':
	if (is_oper(user)) {
	    if (is_services_admin(user)) {
		if (!add)
		    send_cmd(ServerName, "SVSMODE %s +a", user->nick);
	    } else {
		if (add)
		    send_cmd(ServerName, "SVSMODE %s -a", user->nick);
	    }
	    return 1;
	}
    }
    return 0;
}

/*************************************************************************/

static int do_channel_mode(const char *source, Channel *channel,
                           int modechar, int add, char **av)
{
    int32 flag = mode_char_to_flag(modechar, MODE_CHANNEL);

    switch (modechar) {
      case 'L':
        free(channel->link);
        if (add) {
            channel->mode |= flag;
            channel->link = sstrdup(av[0]);
        } else {
            channel->mode &= ~flag;
            channel->link = NULL;
        }
        return 1;

      case 'f':
        free(channel->flood);
        if (add) {
            channel->mode |= flag;
            channel->flood = sstrdup(av[0]);
        } else {
            channel->mode &= ~flag;
            channel->flood = NULL;
        }
        return 1;

      case 'J':
        if (add) {
            channel->mode |= flag;
            channel->joindelay = strtol(av[0], NULL, 0);
        } else {
            channel->mode &= ~flag;
            channel->joindelay = 0;
        }
        return 1;
    }
    return 0;
}

/*************************************************************************/

/* We set +L for the user's language here--but only if they haven't already
 * set it themselves. */

static int do_nick_identified(User *u, int old_status)
{
    int mode_L, lang;

    mode_L = u->mode & mode_char_to_flag('L', MODE_USER);
    /* valid_ngi(u) _should_ always be true, but let's be paranoid */
    if (valid_ngi(u) && u->ngi->language != LANG_DEFAULT)
	lang = u->ngi->language;
    else
	lang = DEF_LANGUAGE;
    if (is_oper(u) && is_services_admin(u)) {
	if (!mode_L)
	    send_cmd(ServerName, "SVSMODE %s +aL %d", u->nick, langhash[lang]);
	else
	    send_cmd(ServerName, "SVSMODE %s +a", u->nick);
    } else {
	if (!mode_L)
	    send_cmd(ServerName, "SVSMODE %s +L %d", u->nick, langhash[lang]);
    }
    return 0;
}

/*************************************************************************/

static int do_set_topic(const char *source, Channel *c, const char *topic,
			const char *setter, time_t t)
{
    if (setter)
	return 0;
    c->topic_time = t;
    send_cmd(source, "TOPIC %s %s %ld :%s", c->name,
	     c->topic_setter, (long)c->topic_time, c->topic ? c->topic : "");
    return 1;
}

/*************************************************************************/

static int do_check_modes(Channel *c, ChannelInfo *ci, int add, int32 flag)
{
    if (add) {
	switch (mode_flag_to_char(flag, MODE_CHANNEL)) {
          case 'L':
            if (!ci->mlock_link) {
                module_log("warning: removing +L from channel %s mode lock"
                           " (missing parameter)", ci->name);
                ci->mlock_on &= ~mode_char_to_flag('L', MODE_CHANNEL);
            } else {
                if (!c->link || irc_stricmp(ci->mlock_link, c->link) != 0)
                    set_cmode(s_ChanServ, c, "+L", ci->mlock_link);
            }
            return 1;
	  case 'f': 
	    if (!ci->mlock_flood) {
		module_log("warning: removing +f from channel %s mode lock"
			   " (missing parameter)", ci->name);
		ci->mlock_on &= ~mode_char_to_flag('f', MODE_CHANNEL);
	    } else {
		if (!c->flood || irc_stricmp(ci->mlock_flood, c->flood) != 0)
		    set_cmode(s_ChanServ, c, "+f", ci->mlock_flood);
	    }
	    return 1;
	  case 'J':
	    if (ci->mlock_joindelay <= 0) {
		module_log("warning: removing +J from channel %s mode lock"
			   " (invalid parameter: %d)", ci->name,
			   ci->mlock_joindelay);
		ci->mlock_on &= ~mode_char_to_flag('J', MODE_CHANNEL);
		ci->mlock_joindelay = 0;
	    } else {
		if (c->joindelay != ci->mlock_joindelay) {
		    char buf[32];
		    snprintf(buf, sizeof(buf), "%d", ci->mlock_joindelay);
		    set_cmode(s_ChanServ, c, "+J", buf);
		}
	    }
	    return 1;
	}
    } else {  /* remove */
	switch (mode_flag_to_char(flag, MODE_CHANNEL)) {
          case 'L':
	    /* Theoretically the channel can't exist, but send a set_cmode()
	     * just to be safe */
	    set_cmode(s_ChanServ, c, "-L");
            return 1;
	}
    }
    return 0;
}

/*************************************************************************/

static int do_set_mlock(User *u, ChannelInfo *ci, int mode, int add, char **av)
{
    if (!mode) {
	/* Final check of new mode lock--nothing to do */
        return 0;
    }

    /* Single mode set/clear */

    if (add) {

        switch (mode) {
          case 'L':
            if (!valid_chan(av[0])) {
                /* Invalid channel name */
                notice_lang(s_ChanServ, u, CHAN_SET_MLOCK_LINK_BAD, mode);
                return 1;
            }
            if (irc_stricmp(av[0], ci->name) == 0) {
                /* Trying to link to the same channel */
                notice_lang(s_ChanServ, u, CHAN_SET_MLOCK_LINK_SAME, mode);
                return 1;
            }
            ci->mlock_link = sstrdup(av[0]);
            break;

          case 'f': {
            char *s, *t;
            /* Legal format for flood mode is "[*]digits:digits" */
            s = av[0];
            if (*s == '*')
                s++;
            t = strchr(s, ':');
            if (t) {
                t++;
                if (s[strspn(s,"0123456789")] == ':'
                 && t[strspn(t,"0123456789")] == 0
                ) {
                    /* String is valid */
                    ci->mlock_flood = sstrdup(av[0]);
                    break;
                }
            }
            /* String is invalid */
            notice_lang(s_ChanServ, u, CHAN_SET_MLOCK_BAD_PARAM, mode);
            return 1;
          } /* case 'f' */

          case 'J':
	    ci->mlock_joindelay = atol(av[0]);
	    if (ci->mlock_joindelay <= 0) {
		notice_lang(s_ChanServ, u, CHAN_SET_MLOCK_NEED_POSITIVE, 'J');
		return 1;
	    }
	    break;
        } /* switch (mode) */

    } else {  /* !add -> lock off */

        switch (mode) {
          case 'L': {
	    /* The channel should not exist here; check anyway just to be
	     * safe, and do a set_cmode() or send_cmd() as appropriate. */
	    Channel *c = get_channel(ci->name);
	    if (c)
		set_cmode(s_ChanServ, c, "-L");
	    else
		send_cmd(s_ChanServ, "MODE %s -L", ci->name);
	  } /* case 'L' */

	  case 'f':
	    free(ci->mlock_flood);
	    ci->mlock_flood = NULL;
	    break;

	  case 'J':
	    ci->mlock_joindelay = 0;
	    break;
	} /* switch (mode) */

    } /* if (add) */

    return 0;
}

/*************************************************************************/

static int do_send_akill(const char *username, const char *host,
			 time_t expires, const char *who, const char *reason)
{
    time_t now = time(NULL);

    send_cmd(ServerName, "AKILL %s %s %ld %s %ld :%s", host, username,
	     (long)((expires && expires > now) ? expires - now : 0),
	     who ? who : "<unknown>", (long)now, reason);
    return 1;
}

/*************************************************************************/

static int do_cancel_akill(const char *username, const char *host)
{
    send_cmd(ServerName, "RAKILL %s %s", host, username);
    return 1;
}

/*************************************************************************/

static int do_send_exclude(const char *username, const char *host,
			   time_t expires, const char *who, const char *reason)
{
    time_t now = time(NULL);

    send_cmd(ServerName, "EXCLUDE %s %s %ld %s %ld :%s", host, username,
	     (long)((expires && expires > now) ? expires - now : 0),
	     who ? who : "<unknown>", (long)now, reason);
    return 1;
}

/*************************************************************************/

static int do_cancel_exclude(const char *username, const char *host)
{
    send_cmd(ServerName, "REXCLUDE %s %s", host, username);
    return 1;
}

/*************************************************************************/

static int do_send_sgline(const char *mask, time_t expires, const char *who,
			  const char *reason)
{
    send_cmd(ServerName, "SGLINE %d :%s:%s", (int)strlen(mask), mask, reason);
    return 1;
}

static int do_send_sqline(const char *mask, time_t expires, const char *who,
			  const char *reason)
{
    send_cmd(ServerName, "SQLINE %s :%s", mask, reason);
    return 1;
}

static int do_send_szline(const char *mask, time_t expires, const char *who,
			  const char *reason)
{
    send_cmd(ServerName, "SZLINE %s :%s", mask, reason);
    return 1;
}

/*************************************************************************/

static int do_cancel_sgline(const char *mask)
{
    send_cmd(ServerName, "UNSGLINE :%s", mask);
    return 1;
}

static int do_cancel_sqline(const char *mask)
{
    send_cmd(ServerName, "UNSQLINE %s", mask);
    return 1;
}

static int do_cancel_szline(const char *mask)
{
    send_cmd(ServerName, "UNSZLINE %s", mask);
    return 1;
}

/*************************************************************************/
/***************************** Module stuff ******************************/
/*************************************************************************/

const int32 module_version = MODULE_VERSION_CODE;

ConfigDirective module_config[] = {
    { "NetworkDomain", { { CD_STRING, 0, &NetworkDomain } } },
    SJOIN_CONFIG,
    { NULL }
};

/*************************************************************************/

static int do_load_module(Module *mod, const char *modname)
{
    if (strcmp(modname, "operserv/main") == 0) {
	module_operserv = mod;
	p_is_services_admin = get_module_symbol(mod, "is_services_admin");
	if (!p_is_services_admin) {
	    module_log("warning: unable to look up symbol `is_services_admin'"
		       " in module `operserv/main'");
	}
    } else if (strcmp(modname, "operserv/akill") == 0) {
	if (!add_callback(mod, "send_akill", do_send_akill))
	    module_log("Unable to add send_akill callback");
	if (!add_callback(mod, "send_exclude", do_send_exclude))
	    module_log("Unable to add send_exclude callback");
	if (!add_callback(mod, "cancel_akill", do_cancel_akill))
	    module_log("Unable to add cancel_akill callback");
	if (!add_callback(mod, "cancel_exclude", do_cancel_exclude))
	    module_log("Unable to add cancel_exclude callback");
    } else if (strcmp(modname, "operserv/sline") == 0) {
	if (!add_callback(mod, "send_sgline", do_send_sgline))
	    module_log("Unable to add send_sgline callback");
	if (!add_callback(mod, "send_sqline", do_send_sqline))
	    module_log("Unable to add send_sqline callback");
	if (!add_callback(mod, "send_szline", do_send_szline))
	    module_log("Unable to add send_szline callback");
	if (!add_callback(mod, "cancel_sgline", do_cancel_sgline))
	    module_log("Unable to add cancel_sgline callback");
	if (!add_callback(mod, "cancel_sqline", do_cancel_sqline))
	    module_log("Unable to add cancel_sqline callback");
	if (!add_callback(mod, "cancel_szline", do_cancel_szline))
	    module_log("Unable to add cancel_szline callback");
    } else if (strcmp(modname, "nickserv/main") == 0) {
	if (!add_callback(mod, "identified", do_nick_identified))
	    module_log("Unable to add NickServ identified callback");
    } else if (strcmp(modname, "chanserv/main") == 0) {
        module_chanserv = mod;
        p_s_ChanServ = get_module_symbol(mod, "s_ChanServ");
        if (!p_s_ChanServ) {
            module_log("Unable to resolve symbol `s_ChanServ' in module"   
                       " `chanserv/main'");
            p_s_ChanServ = &ServerName;
        }
	/* first/next_channelinfo are defined in the database module */
	p_first_channelinfo = get_module_symbol(NULL, "first_channelinfo");
	if (!p_first_channelinfo)
	    module_log("Unable to resolve symbol `first_channelinfo'");
	p_next_channelinfo = get_module_symbol(NULL, "next_channelinfo");
	if (!p_next_channelinfo)
	    module_log("Unable to resolve symbol `next_channelinfo'");
        if (!add_callback(mod, "check_modes", do_check_modes))
            module_log("Unable to add ChanServ check_modes callback");
        if (!add_callback(mod, "SET MLOCK", do_set_mlock))
            module_log("Unable to add ChanServ SET MLOCK callback");
    }

    return 0;
}

/*************************************************************************/

static int do_unload_module(Module *mod)
{
    if (mod == module_operserv) {
	module_operserv = NULL;
	p_is_services_admin = NULL;
    } else if (mod == module_chanserv) {
	module_chanserv = NULL;
	p_s_ChanServ = &ServerName;
	p_first_channelinfo = NULL;
	p_next_channelinfo = NULL;
        remove_callback(mod, "SET MLOCK", do_set_mlock);
        remove_callback(mod, "check_modes", do_check_modes);
    }
    return 0;
}

/*************************************************************************/

int init_module(Module *module_)
{
    unsigned char c;

    module = module_;

    protocol_name     = "trircd";
    protocol_version  = "5.5+";
    protocol_features = PF_SZLINE | PF_SVSJOIN | PF_AKILL_EXCL | PF_HALFOP
                      | PF_NOQUIT;
    protocol_nickmax  = 30;

    if (!register_messages(trircd_messages)) {
	module_log("Unable to register messages");
	exit_module(1);
	return 0;
    }

    if (!add_callback(NULL, "load module", do_load_module)
     || !add_callback(NULL, "unload module", do_unload_module)
     || !add_callback(NULL, "connect", do_connect)
     || !add_callback(NULL, "receive message", do_receive_message)
     || !add_callback(NULL, "user create", do_user_create)
     || !add_callback(NULL, "channel MODE", do_channel_mode)
     || !add_callback(NULL, "user servicestamp change",
		      do_user_servicestamp_change)
     || !add_callback(NULL, "user MODE", do_user_mode)
     || !add_callback(NULL, "set topic", do_set_topic)
    ) {
	module_log("Unable to add callbacks");
	exit_module(1);
	return 0;
    }

    if (!init_banexcept(module)
     || !init_chanprot(module)
     || !init_halfop(module)
     || !init_invitemask(module)
     || !init_sjoin(module)
     || !init_svsnick(module)
     || !init_token(module, trircd5_tokens)
    ) {
	exit_module(1);
	return 0;
    }

    init_modes();
    init_langhash();

    irc_lowertable['['] = '[';
    irc_lowertable['\\'] = '\\';
    irc_lowertable[']'] = ']';
    for (c = 'A'; c <= '}'; c++)
	valid_nick_table[c] = 3;
    for (c = 0; c < 32; c++)
	valid_chan_table[c] = 0;
    valid_chan_table[160] = 0;

    send_nick          = do_send_nick;
    send_nickchange    = do_send_nickchange;
    send_namechange    = do_send_namechange;
    send_server        = do_send_server;
    send_server_remote = do_send_server_remote;
    wallops            = do_wallops;
    notice_all         = do_notice_all;
    send_channel_cmd   = do_send_channel_cmd;
    pseudoclient_modes = "";
    enforcer_modes     = "";

    setstring(OPER_BOUNCY_MODES, OPER_BOUNCY_MODES_U_LINE);

    return 1;
}

/*************************************************************************/

int exit_module(int shutdown)
{
    if (!shutdown) {
	/* Do not allow removal */
	return 0;
    }

    exit_token();
    exit_svsnick();
    exit_sjoin();
    exit_invitemask();
    exit_halfop();
    exit_chanprot();
    exit_banexcept();

    remove_callback(NULL, "set topic", do_set_topic);
    remove_callback(NULL, "user MODE", do_user_mode);
    remove_callback(NULL, "user servicestamp change",
		    do_user_servicestamp_change);
    remove_callback(NULL, "channel MODE", do_channel_mode);
    remove_callback(NULL, "user create", do_user_create);
    remove_callback(NULL, "receive message", do_receive_message);
    remove_callback(NULL, "connect", do_connect);
    remove_callback(NULL, "unload module", do_unload_module);
    remove_callback(NULL, "load module", do_load_module);
    unregister_messages(trircd_messages);
    return 1;
}

/*************************************************************************/
