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ircu2/ircd/zline.c

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/*
* IRC - Internet Relay Chat, ircd/zline.c
* Copyright (C) 1990 Jarkko Oikarinen and
* University of Oulu, Finland
*
* 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 Zline manipulation functions.
* @version $Id: zline.c 1936 2010-01-07 02:55:33Z entrope $
*/
#include "config.h"
#include "zline.h"
#include "channel.h"
#include "client.h"
#include "ircd.h"
#include "ircd_alloc.h"
#include "ircd_features.h"
#include "ircd_log.h"
#include "ircd_reply.h"
#include "ircd_snprintf.h"
#include "ircd_string.h"
#include "match.h"
#include "numeric.h"
#include "res.h"
#include "s_bsd.h"
#include "s_conf.h"
#include "s_debug.h"
#include "s_misc.h"
#include "s_stats.h"
#include "send.h"
#include "struct.h"
#include "sys.h"
#include "msg.h"
#include "numnicks.h"
#include "numeric.h"
/* #include <assert.h> -- Now using assert in ircd_log.h */
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#define CHECK_APPROVED 0 /**< Mask is acceptable */
#define CHECK_OVERRIDABLE 1 /**< Mask is acceptable, but not by default */
#define CHECK_REJECTED 2 /**< Mask is totally unacceptable */
#define MASK_WILD_0 0x01 /**< Wildcards in the last position */
#define MASK_WILD_1 0x02 /**< Wildcards in the next-to-last position */
#define MASK_WILD_MASK 0x03 /**< Mask out the positional wildcards */
#define MASK_WILDS 0x10 /**< Mask contains wildcards */
#define MASK_IP 0x20 /**< Mask is an IP address */
#define MASK_HALT 0x40 /**< Finished processing mask */
/** List of user Z-lines. */
struct Zline* GlobalZlineList = 0;
/** Iterate through \a list of Z-lines. Use this like a for loop,
* i.e., follow it with braces and use whatever you passed as \a zl
* as a single Z-line to be acted upon.
*
* @param[in] list List of Z-lines to iterate over.
* @param[in] zl Name of a struct Zline pointer variable that will be made to point to the Z-lines in sequence.
* @param[in] next Name of a scratch struct Zline pointer variable.
*/
/* There is some subtlety here with the boolean operators:
* (x || 1) is used to continue in a logical-and series even when !x.
* (x && 0) is used to continue in a logical-or series even when x.
*/
#define zliter(list, zl, next) \
/* Iterate through the Z-lines in the list */ \
for ((zl) = (list); (zl); (zl) = (next)) \
/* Figure out the next pointer in list... */ \
if ((((next) = (zl)->zl_next) || 1) && \
/* Then see if it's expired */ \
(zl)->zl_lifetime <= TStime()) \
/* Record has expired, so free the Z-line */ \
zline_free((zl)); \
/* See if we need to expire the Z-line */ \
else if ((((zl)->zl_expire > TStime()) || \
(((zl)->zl_flags &= ~ZLINE_ACTIVE) && 0) || \
((zl)->zl_state = ZLOCAL_GLOBAL)) && 0) \
; /* empty statement */ \
else
/** Create a Zline structure.
* @param[in] mask Mask.
* @param[in] reason Reason for Z-line.
* @param[in] expire Expiration timestamp.
* @param[in] lastmod Last modification timestamp.
* @param[in] flags Bitwise combination of ZLINE_* bits.
* @return Newly allocated Z-line.
*/
static struct Zline *
make_zline(char *mask, char *reason, time_t expire, time_t lastmod,
time_t lifetime, unsigned int flags)
{
struct Zline *zline;
assert(0 != expire);
zline = (struct Zline *)MyMalloc(sizeof(struct Zline)); /* alloc memory */
assert(0 != zline);
DupString(zline->zl_reason, reason); /* initialize zline... */
zline->zl_expire = expire;
zline->zl_lifetime = lifetime;
zline->zl_lastmod = lastmod;
zline->zl_flags = flags & ZLINE_MASK;
zline->zl_state = ZLOCAL_GLOBAL; /* not locally modified */
DupString(zline->zl_mask, mask);
if (ipmask_parse(mask, &zline->zl_addr, &zline->zl_bits)) {
zline->zl_flags |= ZLINE_IPMASK;
zline->zl_addr = ipmask_clean(&zline->zl_addr, zline->zl_bits);
}
zline->zl_next = GlobalZlineList; /* then link it into list */
zline->zl_prev_p = &GlobalZlineList;
if (GlobalZlineList)
GlobalZlineList->zl_prev_p = &zline->zl_next;
GlobalZlineList = zline;
return zline;
}
/** Check local clients against a new Z-line.
* If the Z-line is inactive, return immediately.
* Otherwise, if any users match it, disconnect them.
* @param[in] cptr Peer connect that sent the Z-line.
* @param[in] sptr Client that originated the Z-line.
* @param[in] zline New Z-line to check.
* @return Zero, unless \a sptr Z-lined himself, in which case CPTR_KILLED.
*/
static int
do_zline(struct Client *cptr, struct Client *sptr, struct Zline *zline)
{
struct Client *acptr;
int fd, retval = 0, tval;
if (feature_bool(FEAT_DISABLE_ZLINES))
return 0; /* Z-lines are disabled */
if (!ZlineIsActive(zline)) /* no action taken on inactive zlines */
return 0;
for (fd = HighestFd; fd >= 0; --fd) {
/*
* get the users!
*/
if ((acptr = LocalClientArray[fd])) {
if (!cli_user(acptr))
continue;
if (find_except_conf(acptr, EFLAG_ZLINE))
continue;
/* IP zline */
if (ZlineIsIpMask(zline)) {
if (!irc_in_addr_type_cmp(&cli_ip(acptr), &zline->zl_addr) && zline->zl_bits)
continue;
if (!ipmask_check(&cli_ip(acptr), &zline->zl_addr, zline->zl_bits))
continue;
}
else {
if (match(zline->zl_mask, cli_sock_ip(acptr)) != 0)
continue;
}
/* ok, here's one that got Z-lined */
send_reply(acptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP, ":%s",
zline->zl_reason);
/* let the ops know about it */
sendto_opmask_butone_global(&me, SNO_GLINE, "Z-line active for %s",
get_client_name(acptr, SHOW_IP));
/* and get rid of him */
if ((tval = exit_client_msg(cptr, acptr, &me, "Z-lined%s%s%s",
(!feature_bool(FEAT_HIS_ZLINE_REASON) ? " (" : ""),
(!feature_bool(FEAT_HIS_ZLINE_REASON) ? zline->zl_reason : ""),
(!feature_bool(FEAT_HIS_ZLINE_REASON) ? ")" : ""))))
retval = tval; /* retain killed status */
}
}
return retval;
}
/**
* Implements the mask checking applied to local Z-lines.
* Basically, host masks must have a minimum of two non-wild domain
* fields, and IP masks must have a minimum of 16 bits. If the mask
* has even one wild-card, OVERRIDABLE is returned, assuming the other
* check doesn't fail.
* @param[in] mask Z-line mask to check.
* @return One of CHECK_REJECTED, CHECK_OVERRIDABLE, or CHECK_APPROVED.
*/
static int
zline_checkmask(char *mask)
{
unsigned int flags = MASK_IP;
unsigned int dots = 0;
unsigned int ipmask = 0;
for (; *mask; mask++) { /* go through given mask */
if (*mask == '.') { /* it's a separator; advance positional wilds */
flags = (flags & ~MASK_WILD_MASK) | ((flags << 1) & MASK_WILD_MASK);
dots++;
if ((flags & (MASK_IP | MASK_WILDS)) == MASK_IP)
ipmask += 8; /* It's an IP with no wilds, count bits */
} else if (*mask == '*' || *mask == '?')
flags |= MASK_WILD_0 | MASK_WILDS; /* found a wildcard */
else if (*mask == '/') { /* n.n.n.n/n notation; parse bit specifier */
++mask;
ipmask = strtoul(mask, &mask, 10);
/* sanity-check to date */
if (*mask || (flags & (MASK_WILDS | MASK_IP)) != MASK_IP)
return CHECK_REJECTED;
if (!dots) {
if (ipmask > 128)
return CHECK_REJECTED;
if (ipmask < 128)
flags |= MASK_WILDS;
} else {
if (dots != 3 || ipmask > 32)
return CHECK_REJECTED;
if (ipmask < 32)
flags |= MASK_WILDS;
}
flags |= MASK_HALT; /* Halt the ipmask calculation */
break; /* get out of the loop */
} else if (!IsIP6Char(*mask)) {
flags &= ~MASK_IP; /* not an IP anymore! */
ipmask = 0;
}
}
/* Sanity-check quads */
if (dots > 3 || (!(flags & MASK_WILDS) && dots < 3)) {
flags &= ~MASK_IP;
ipmask = 0;
}
/* update bit count if necessary */
if ((flags & (MASK_IP | MASK_WILDS | MASK_HALT)) == MASK_IP)
ipmask += 8;
/* Check to see that it's not too wide of a mask */
if (flags & MASK_WILDS &&
((!(flags & MASK_IP) && (dots < 2 || flags & MASK_WILD_MASK)) ||
(flags & MASK_IP && ipmask < 16)))
return CHECK_REJECTED; /* to wide, reject */
/* Ok, it's approved; require override if it has wildcards, though */
return flags & MASK_WILDS ? CHECK_OVERRIDABLE : CHECK_APPROVED;
}
/** Forward a Z-line to other servers.
* @param[in] cptr Client that sent us the Z-line.
* @param[in] sptr Client that originated the Z-line.
* @param[in] zline Z-line to forward.
* @return Zero.
*/
static int
zline_propagate(struct Client *cptr, struct Client *sptr, struct Zline *zline)
{
if (ZlineIsLocal(zline))
return 0;
assert(zline->zl_lastmod);
sendcmdto_serv_butone(sptr, CMD_ZLINE, cptr, "* %c%s %Tu %Tu %Tu :%s",
ZlineIsRemActive(zline) ? '+' : '-',
zline->zl_mask, zline->zl_expire - TStime(),
zline->zl_lastmod, zline->zl_lifetime, zline->zl_reason);
return 0;
}
/** Count number of users who match \a mask.
* @param[in] mask ip mask to check.
* @param[in] flags Bitmask possibly containing the value ZLINE_LOCAL, to limit searches to this server.
* @return Count of matching users.
*/
static int
count_users(char *mask, int flags)
{
struct irc_in_addr ipmask;
struct Client *acptr;
int count = 0;
int ipmask_valid;
char ipbuf[SOCKIPLEN + 2];
unsigned char ipmask_len;
ipmask_valid = ipmask_parse(mask, &ipmask, &ipmask_len);
for (acptr = GlobalClientList; acptr; acptr = cli_next(acptr)) {
if (!IsUser(acptr))
continue;
if ((flags & ZLINE_LOCAL) && !MyConnect(acptr))
continue;
ircd_snprintf(0, ipbuf, sizeof(ipbuf), "%s", ircd_ntoa(&cli_ip(acptr)));
if (!match(mask, ipbuf)
|| (ipmask_valid && ipmask_check(&cli_ip(acptr), &ipmask, ipmask_len)
&& (irc_in_addr_type_cmp(&cli_ip(acptr), &ipmask) && ipmask_len)))
count++;
}
return count;
}
/** Create a new Z-line and add it to global lists.
* \a ipmask must be an IP mask to create an IP-based ban.
*
* @param[in] cptr Client that sent us the Z-line.
* @param[in] sptr Client that originated the Z-line.
* @param[in] ipmask Text mask for the Z-line.
* @param[in] reason Reason for Z-line.
* @param[in] expire Expiration time of Z-line.
* @param[in] lastmod Last modification time of Z-line.
* @param[in] lifetime Lifetime of Z-line.
* @param[in] flags Bitwise combination of ZLINE_* flags.
* @return Zero or CPTR_KILLED, depending on whether \a sptr is suicidal.
*/
int
zline_add(struct Client *cptr, struct Client *sptr, char *ipmask,
char *reason, time_t expire, time_t lastmod, time_t lifetime,
unsigned int flags)
{
struct Zline *azline;
char imask[HOSTLEN + 2];
char *mask;
int tmp;
assert(0 != ipmask);
assert(0 != reason);
assert(((flags & (ZLINE_GLOBAL | ZLINE_LOCAL)) == ZLINE_GLOBAL) ||
((flags & (ZLINE_GLOBAL | ZLINE_LOCAL)) == ZLINE_LOCAL));
Debug((DEBUG_DEBUG, "zline_add(\"%s\", \"%s\", \"%s\", \"%s\", %Tu, %Tu "
"%Tu, 0x%04x)", cli_name(cptr), cli_name(sptr), ipmask, reason,
expire, lastmod, lifetime, flags));
mask = ipmask;
if (sizeof(imask) <
ircd_snprintf(0, imask, sizeof(imask), "%s", mask))
return send_reply(sptr, ERR_LONGMASK);
else if (MyUser(sptr) || (IsUser(sptr) && flags & ZLINE_LOCAL)) {
switch (zline_checkmask(mask)) {
case CHECK_OVERRIDABLE: /* oper overrided restriction */
if (flags & ZLINE_OPERFORCE)
break;
/*FALLTHROUGH*/
case CHECK_REJECTED:
return send_reply(sptr, ERR_MASKTOOWIDE, imask);
break;
}
if ((tmp = count_users(imask, flags)) >=
feature_int(FEAT_ZLINEMAXUSERCOUNT) && !(flags & ZLINE_OPERFORCE))
return send_reply(sptr, ERR_TOOMANYUSERS, tmp);
}
if (!check_if_ipmask(ipmask))
return send_reply(sptr, ERR_INVALIDMASK);
/*
* You cannot set a negative (or zero) expire time, nor can you set an
* expiration time for greater than ZLINE_MAX_EXPIRE.
*/
if (!(flags & ZLINE_FORCE) &&
(expire <= TStime() || expire > TStime() + ZLINE_MAX_EXPIRE)) {
if (!IsServer(sptr) && MyConnect(sptr))
send_reply(sptr, ERR_BADEXPIRE, expire);
return 0;
} else if (expire <= TStime()) {
/* This expired Z-line was forced to be added, so mark it inactive. */
flags &= ~ZLINE_ACTIVE;
}
if (!lifetime) /* no lifetime set, use expiration time */
lifetime = expire;
/* lifetime is already an absolute timestamp */
/* Inform ops... */
sendto_opmask_butone(0, ircd_strncmp(reason, "AUTO", 4) ? SNO_GLINE :
SNO_AUTO, "%s adding %s%s ZLINE for %s, expiring at "
"%Tu: %s",
(feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
cli_name(sptr) :
cli_name((cli_user(sptr))->server),
(flags & ZLINE_ACTIVE) ? "" : "deactivated ",
(flags & ZLINE_LOCAL) ? "local" : "global",
mask, expire, reason);
/* and log it */
log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
"%#C adding %s ZLINE for %s, expiring at %Tu: %s", sptr,
flags & ZLINE_LOCAL ? "local" : "global", mask,
expire, reason);
/* make the zline */
azline = make_zline(mask, reason, expire, lastmod, lifetime, flags);
/* since we've disabled overlapped Z-line checking, azline should
* never be NULL...
*/
assert(azline);
zline_propagate(cptr, sptr, azline);
return do_zline(cptr, sptr, azline); /* knock off users if necessary */
}
/** Activate a currently inactive Z-line.
* @param[in] cptr Peer that told us to activate the Z-line.
* @param[in] sptr Client that originally thought it was a good idea.
* @param[in] zline Z-line to activate.
* @param[in] lastmod New value for last modification timestamp.
* @param[in] flags 0 if the activation should be propagated, ZLINE_LOCAL if not.
* @return Zero, unless \a sptr had a death wish (in which case CPTR_KILLED).
*/
int
zline_activate(struct Client *cptr, struct Client *sptr, struct Zline *zline,
time_t lastmod, unsigned int flags)
{
unsigned int saveflags = 0;
assert(0 != zline);
saveflags = zline->zl_flags;
if (flags & ZLINE_LOCAL)
zline->zl_flags &= ~ZLINE_LDEACT;
else {
zline->zl_flags |= ZLINE_ACTIVE;
if (zline->zl_lastmod) {
if (zline->zl_lastmod >= lastmod) /* force lastmod to increase */
zline->zl_lastmod++;
else
zline->zl_lastmod = lastmod;
}
}
if ((saveflags & ZLINE_ACTMASK) == ZLINE_ACTIVE)
return 0; /* was active to begin with */
/* Inform ops and log it */
sendto_opmask_butone(0, SNO_GLINE, "%s activating global ZLINE for %s, "
"expiring at %Tu: %s",
(feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
cli_name(sptr) :
cli_name((cli_user(sptr))->server),
zline->zl_mask, zline->zl_expire, zline->zl_reason);
log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
"%#C activating global ZLINE for %s, expiring at %Tu: %s", sptr,
zline->zl_mask, zline->zl_expire, zline->zl_reason);
if (!(flags & ZLINE_LOCAL)) /* don't propagate local changes */
zline_propagate(cptr, sptr, zline);
return do_zline(cptr, sptr, zline);
}
/** Deactivate a Z-line.
* @param[in] cptr Peer that gave us the message.
* @param[in] sptr Client that initiated the deactivation.
* @param[in] zline Z-line to deactivate.
* @param[in] lastmod New value for Z-line last modification timestamp.
* @param[in] flags ZLINE_LOCAL to only deactivate locally, 0 to propagate.
* @return Zero.
*/
int
zline_deactivate(struct Client *cptr, struct Client *sptr, struct Zline *zline,
time_t lastmod, unsigned int flags)
{
unsigned int saveflags = 0;
char *msg;
assert(0 != zline);
saveflags = zline->zl_flags;
if (ZlineIsLocal(zline))
msg = "removing local";
else if (!zline->zl_lastmod && !(flags & ZLINE_LOCAL)) {
msg = "removing global";
zline->zl_flags &= ~ZLINE_ACTIVE; /* propagate a -<mask> */
} else {
msg = "deactivating global";
if (flags & ZLINE_LOCAL)
zline->zl_flags |= ZLINE_LDEACT;
else {
zline->zl_flags &= ~ZLINE_ACTIVE;
if (zline->zl_lastmod) {
if (zline->zl_lastmod >= lastmod)
zline->zl_lastmod++;
else
zline->zl_lastmod = lastmod;
}
}
if ((saveflags & ZLINE_ACTMASK) != ZLINE_ACTIVE)
return 0; /* was inactive to begin with */
}
/* Inform ops and log it */
sendto_opmask_butone(0, SNO_GLINE, "%s %s ZLINE for %s, expiring at %Tu: "
"%s",
(feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
cli_name(sptr) :
cli_name((cli_user(sptr))->server), msg,
zline->zl_mask, zline->zl_expire, zline->zl_reason);
log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
"%#C %s ZLINE for %s, expiring at %Tu: %s", sptr, msg,
zline->zl_mask, zline->zl_expire, zline->zl_reason);
if (!(flags & ZLINE_LOCAL)) /* don't propagate local changes */
zline_propagate(cptr, sptr, zline);
/* if it's a local zline or a Uworld zline (and not locally deactivated).. */
if (ZlineIsLocal(zline) || (!zline->zl_lastmod && !(flags & ZLINE_LOCAL)))
zline_free(zline); /* get rid of it */
return 0;
}
/** Modify a global Z-line.
* @param[in] cptr Client that sent us the Z-line modification.
* @param[in] sptr Client that originated the Z-line modification.
* @param[in] zline Z-line being modified.
* @param[in] action Resultant status of the Z-line.
* @param[in] reason Reason for Z-line.
* @param[in] expire Expiration time of Z-line.
* @param[in] lastmod Last modification time of Z-line.
* @param[in] lifetime Lifetime of Z-line.
* @param[in] flags Bitwise combination of ZLINE_* flags.
* @return Zero or CPTR_KILLED, depending on whether \a sptr is suicidal.
*/
int
zline_modify(struct Client *cptr, struct Client *sptr, struct Zline *zline,
enum ZlineAction action, char *reason, time_t expire,
time_t lastmod, time_t lifetime, unsigned int flags)
{
char buf[BUFSIZE], *op = "";
int pos = 0, non_auto = 0;
assert(zline);
assert(!ZlineIsLocal(zline));
Debug((DEBUG_DEBUG, "zline_modify(\"%s\", \"%s\", \"%s\", %s, \"%s\", "
"%Tu, %Tu, %Tu, 0x%04x)", cli_name(cptr), cli_name(sptr),
zline->zl_mask,
action == ZLINE_ACTIVATE ? "ZLINE_ACTIVATE" :
(action == ZLINE_DEACTIVATE ? "ZLINE_DEACTIVATE" :
(action == ZLINE_LOCAL_ACTIVATE ? "ZLINE_LOCAL_ACTIVATE" :
(action == ZLINE_LOCAL_DEACTIVATE ? "ZLINE_LOCAL_DEACTIVATE" :
(action == ZLINE_MODIFY ? "ZLINE_MODIFY" : "<UNKNOWN>")))),
reason, expire, lastmod, lifetime, flags));
/* First, let's check lastmod... */
if (action != ZLINE_LOCAL_ACTIVATE && action != ZLINE_LOCAL_DEACTIVATE) {
if (ZlineLastMod(zline) > lastmod) { /* we have a more recent version */
if (IsBurstOrBurstAck(cptr))
return 0; /* middle of a burst, it'll resync on its own */
return zline_resend(cptr, zline); /* resync the server */
} else if (ZlineLastMod(zline) == lastmod)
return 0; /* we have that version of the Z-line... */
}
/* All right, we know that there's a change of some sort. What is it? */
/* first, check out the expiration time... */
if ((flags & ZLINE_EXPIRE) && expire) {
if (!(flags & ZLINE_FORCE) &&
(expire <= TStime() || expire > TStime() + ZLINE_MAX_EXPIRE)) {
if (!IsServer(sptr) && MyConnect(sptr)) /* bad expiration time */
send_reply(sptr, ERR_BADEXPIRE, expire);
return 0;
}
} else
flags &= ~ZLINE_EXPIRE;
/* Now check to see if there's any change... */
if ((flags & ZLINE_EXPIRE) && expire == zline->zl_expire) {
flags &= ~ZLINE_EXPIRE; /* no change to expiration time... */
expire = 0;
}
/* Next, check out lifetime--this one's a bit trickier... */
if (!(flags & ZLINE_LIFETIME) || !lifetime)
lifetime = zline->zl_lifetime; /* use Z-line lifetime */
lifetime = IRCD_MAX(lifetime, expire); /* set lifetime to the max */
/* OK, let's see which is greater... */
if (lifetime > zline->zl_lifetime)
flags |= ZLINE_LIFETIME; /* have to update lifetime */
else {
flags &= ~ZLINE_LIFETIME; /* no change to lifetime */
lifetime = 0;
}
/* Finally, let's see if the reason needs to be updated */
if ((flags & ZLINE_REASON) && reason &&
!ircd_strcmp(zline->zl_reason, reason))
flags &= ~ZLINE_REASON; /* no changes to the reason */
/* OK, now let's take a look at the action... */
if ((action == ZLINE_ACTIVATE && (zline->zl_flags & ZLINE_ACTIVE)) ||
(action == ZLINE_DEACTIVATE && !(zline->zl_flags & ZLINE_ACTIVE)) ||
(action == ZLINE_LOCAL_ACTIVATE &&
(zline->zl_state == ZLOCAL_ACTIVATED)) ||
(action == ZLINE_LOCAL_DEACTIVATE &&
(zline->zl_state == ZLOCAL_DEACTIVATED)) ||
/* can't activate an expired Z-line */
IRCD_MAX(zline->zl_expire, expire) <= TStime())
action = ZLINE_MODIFY; /* no activity state modifications */
Debug((DEBUG_DEBUG, "About to perform changes; flags 0x%04x, action %s",
flags, action == ZLINE_ACTIVATE ? "ZLINE_ACTIVATE" :
(action == ZLINE_DEACTIVATE ? "ZLINE_DEACTIVATE" :
(action == ZLINE_LOCAL_ACTIVATE ? "ZLINE_LOCAL_ACTIVATE" :
(action == ZLINE_LOCAL_DEACTIVATE ? "ZLINE_LOCAL_DEACTIVATE" :
(action == ZLINE_MODIFY ? "ZLINE_MODIFY" : "<UNKNOWN>"))))));
/* If there are no changes to perform, do no changes */
if (!(flags & ZLINE_UPDATE) && action == ZLINE_MODIFY)
return 0;
/* Now we know what needs to be changed, so let's process the changes... */
/* Start by updating lastmod, if indicated... */
if (action != ZLINE_LOCAL_ACTIVATE && action != ZLINE_LOCAL_DEACTIVATE)
zline->zl_lastmod = lastmod;
/* Then move on to activity status changes... */
switch (action) {
case ZLINE_ACTIVATE: /* Globally activating Z-line */
zline->zl_flags |= ZLINE_ACTIVE; /* make it active... */
zline->zl_state = ZLOCAL_GLOBAL; /* reset local activity state */
pos += ircd_snprintf(0, buf, sizeof(buf), " globally activating Z-line");
op = "+"; /* operation for Z-line propagation */
break;
case ZLINE_DEACTIVATE: /* Globally deactivating Z-line */
zline->zl_flags &= ~ZLINE_ACTIVE; /* make it inactive... */
zline->zl_state = ZLOCAL_GLOBAL; /* reset local activity state */
pos += ircd_snprintf(0, buf, sizeof(buf), " globally deactivating Z-line");
op = "-"; /* operation for Z-line propagation */
break;
case ZLINE_LOCAL_ACTIVATE: /* Locally activating Z-line */
zline->zl_state = ZLOCAL_ACTIVATED; /* make it locally active */
pos += ircd_snprintf(0, buf, sizeof(buf), " locally activating Z-line");
break;
case ZLINE_LOCAL_DEACTIVATE: /* Locally deactivating Z-line */
zline->zl_state = ZLOCAL_DEACTIVATED; /* make it locally inactive */
pos += ircd_snprintf(0, buf, sizeof(buf), " locally deactivating Z-line");
break;
case ZLINE_MODIFY: /* no change to activity status */
break;
}
/* Handle expiration changes... */
if (flags & ZLINE_EXPIRE) {
zline->zl_expire = expire; /* save new expiration time */
if (pos < BUFSIZE)
pos += ircd_snprintf(0, buf + pos, sizeof(buf) - pos,
"%s%s changing expiration time to %Tu",
pos ? ";" : "",
pos && !(flags & (ZLINE_LIFETIME | ZLINE_REASON)) ?
" and" : "", expire);
}
/* Next, handle lifetime changes... */
if (flags & ZLINE_LIFETIME) {
zline->zl_lifetime = lifetime; /* save new lifetime */
if (pos < BUFSIZE)
pos += ircd_snprintf(0, buf + pos, sizeof(buf) - pos,
"%s%s extending record lifetime to %Tu",
pos ? ";" : "", pos && !(flags & ZLINE_REASON) ?
" and" : "", lifetime);
}
/* Now, handle reason changes... */
if (flags & ZLINE_REASON) {
non_auto = non_auto || ircd_strncmp(zline->zl_reason, "AUTO", 4);
MyFree(zline->zl_reason); /* release old reason */
DupString(zline->zl_reason, reason); /* store new reason */
if (pos < BUFSIZE)
pos += ircd_snprintf(0, buf + pos, sizeof(buf) - pos,
"%s%s changing reason to \"%s\"",
pos ? ";" : "", pos ? " and" : "", reason);
}
/* All right, inform ops... */
non_auto = non_auto || ircd_strncmp(zline->zl_reason, "AUTO", 4);
sendto_opmask_butone(0, non_auto ? SNO_GLINE : SNO_AUTO,
"%s modifying global ZLINE for %s:%s",
(feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
cli_name(sptr) : cli_name((cli_user(sptr))->server),
zline->zl_mask, buf);
/* and log the change */
log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
"%#C modifying global ZLINE for %s:%s", sptr, zline->zl_mask, buf);
/* We'll be simple for this release, but we can update this to change
* the propagation syntax on future updates
*/
if (action != ZLINE_LOCAL_ACTIVATE && action != ZLINE_LOCAL_DEACTIVATE)
sendcmdto_serv_butone(sptr, CMD_ZLINE, cptr,
"* %s%s%s %Tu %Tu %Tu :%s",
flags & ZLINE_OPERFORCE ? "!" : "", op,
zline->zl_mask, zline->zl_expire - TStime(),
zline->zl_lastmod, zline->zl_lifetime, zline->zl_reason);
/* OK, let's do the Z-line... */
return do_zline(cptr, sptr, zline);
}
/** Destroy a local Z-line.
* @param[in] cptr Peer that gave us the message.
* @param[in] sptr Client that initiated the destruction.
* @param[in] zline Z-line to destroy.
* @return Zero.
*/
int
zline_destroy(struct Client *cptr, struct Client *sptr, struct Zline *zline)
{
assert(zline);
assert(ZlineIsLocal(zline));
/* Inform ops and log it */
sendto_opmask_butone(0, SNO_GLINE, "%s removing local ZLINE for %s",
(feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
cli_name(sptr) : cli_name((cli_user(sptr))->server),
zline->zl_mask);
log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
"%#C removing local ZLINE for %s", sptr, zline->zl_mask);
zline_free(zline); /* get rid of the Z-line */
return 0; /* convenience return */
}
/** Find a Z-line for a particular mask, guided by certain flags.
* Certain bits in \a flags are interpreted specially:
* <dl>
* <dt>ZLINE_ANY</dt><dd>Search user Z-lines.</dd>
* <dt>ZLINE_GLOBAL</dt><dd>Only match global Z-lines.</dd>
* <dt>ZLINE_LOCAL</dt><dd>Only match local Z-lines.</dd>
* <dt>ZLINE_LASTMOD</dt><dd>Only match Z-lines with a last modification time.</dd>
* <dt>ZLINE_EXACT</dt><dd>Require an exact match of Z-line mask.</dd>
* <dt>anything else</dt><dd>Search user Z-lines.</dd>
* </dl>
* @param[in] ipmask Mask to search for.
* @param[in] flags Bitwise combination of ZLINE_* flags.
* @return First matching Z-line, or NULL if none are found.
*/
struct Zline *
zline_find(char *ipmask, unsigned int flags)
{
struct Zline *zline = 0;
struct Zline *szline;
char *mask, *t_uh;
DupString(t_uh, ipmask);
mask = t_uh;
zliter(GlobalZlineList, zline, szline) {
if ((flags & (ZlineIsLocal(zline) ? ZLINE_GLOBAL : ZLINE_LOCAL)) ||
(flags & ZLINE_LASTMOD && !zline->zl_lastmod))
continue;
else if (flags & ZLINE_EXACT) {
if (((zline->zl_mask && mask && ircd_strcmp(zline->zl_mask, mask) == 0)
|| (!zline->zl_mask && !mask)))
break;
} else {
if (((zline->zl_mask && mask && match(zline->zl_mask, mask) == 0)
|| (!zline->zl_mask && !mask)))
break;
}
}
MyFree(t_uh);
return zline;
}
/** Find a matching Z-line for a user.
* @param[in] cptr Client to compare against.
* @param[in] flags Bitwise combination of ZLINE_GLOBAL and/or
* ZLINE_LASTMOD to limit matches.
* @return Matching Z-line, or NULL if none are found.
*/
struct Zline *
zline_lookup(struct Client *cptr, unsigned int flags)
{
struct Zline *zline;
struct Zline *szline;
if (find_except_conf(cptr, EFLAG_ZLINE))
return 0;
zliter(GlobalZlineList, zline, szline) {
if ((flags & ZLINE_GLOBAL && zline->zl_flags & ZLINE_LOCAL) ||
(flags & ZLINE_LASTMOD && !zline->zl_lastmod))
continue;
if (ZlineIsIpMask(zline)) {
if (!irc_in_addr_type_cmp(&cli_ip(cptr), &zline->zl_addr) && zline->zl_bits)
continue;
if (!ipmask_check(&cli_ip(cptr), &zline->zl_addr, zline->zl_bits))
continue;
}
else {
if (match(zline->zl_mask, cli_sock_ip(cptr)) != 0)
continue;
}
if (ZlineIsActive(zline))
return zline;
}
/*
* No Zlines matched
*/
return 0;
}
/** Delink and free a Z-line.
* @param[in] zline Z-line to free.
*/
void
zline_free(struct Zline *zline)
{
assert(0 != zline);
*zline->zl_prev_p = zline->zl_next; /* squeeze this zline out */
if (zline->zl_next)
zline->zl_next->zl_prev_p = zline->zl_prev_p;
if (zline->zl_mask)
MyFree(zline->zl_mask);
MyFree(zline->zl_reason);
MyFree(zline);
}
/** Burst all known global Z-lines to another server.
* @param[in] cptr Destination of burst.
*/
void
zline_burst(struct Client *cptr)
{
struct Zline *zline;
struct Zline *szline;
zliter(GlobalZlineList, zline, szline) {
if (!ZlineIsLocal(zline) && zline->zl_lastmod)
sendcmdto_one(&me, CMD_ZLINE, cptr, "* %c%s %Tu %Tu %Tu :%s",
ZlineIsRemActive(zline) ? '+' : '-',
zline->zl_mask, zline->zl_expire - TStime(),
zline->zl_lastmod, zline->zl_lifetime,
zline->zl_reason);
}
}
/** Send a Z-line to another server.
* @param[in] cptr Who to inform of the Z-line.
* @param[in] zline Z-line to send.
* @return Zero.
*/
int
zline_resend(struct Client *cptr, struct Zline *zline)
{
if (ZlineIsLocal(zline) || !zline->zl_lastmod)
return 0;
sendcmdto_one(&me, CMD_ZLINE, cptr, "* %c%s %Tu %Tu %Tu :%s",
ZlineIsRemActive(zline) ? '+' : '-',
zline->zl_mask, zline->zl_expire - TStime(),
zline->zl_lastmod, zline->zl_lifetime,
zline->zl_reason);
return 0;
}
/** Display one or all Z-lines to a user.
* If \a ipmask is not NULL, only send the first matching Z-line.
* Otherwise send the whole list.
* @param[in] sptr User asking for Z-line list.
* @param[in] ipmask Z-line mask to search for (or NULL).
* @return Zero.
*/
int
zline_list(struct Client *sptr, char *ipmask)
{
struct Zline *zline;
struct Zline *szline;
if (ipmask) {
if (!(zline = zline_find(ipmask, ZLINE_ANY))) /* no such zline */
return send_reply(sptr, ERR_NOSUCHZLINE, ipmask);
/* send zline information along */
send_reply(sptr, RPL_ZLIST,
zline->zl_mask, zline->zl_expire,
zline->zl_lastmod, zline->zl_lifetime,
ZlineIsLocal(zline) ? cli_name(&me) : "*",
zline->zl_state == ZLOCAL_ACTIVATED ? ">" :
(zline->zl_state == ZLOCAL_DEACTIVATED ? "<" : ""),
ZlineIsRemActive(zline) ? '+' : '-', zline->zl_reason);
} else {
zliter(GlobalZlineList, zline, szline) {
send_reply(sptr, RPL_ZLIST,
zline->zl_mask, zline->zl_expire,
zline->zl_lastmod, zline->zl_lifetime,
ZlineIsLocal(zline) ? cli_name(&me) : "*",
zline->zl_state == ZLOCAL_ACTIVATED ? ">" :
(zline->zl_state == ZLOCAL_DEACTIVATED ? "<" : ""),
ZlineIsRemActive(zline) ? '+' : '-', zline->zl_reason);
}
}
/* end of zline information */
return send_reply(sptr, RPL_ENDOFZLIST);
}
/** Statistics callback to list Z-lines.
* @param[in] sptr Client requesting statistics.
* @param[in] sd Stats descriptor for request (ignored).
* @param[in] param Extra parameter from user (ignored).
*/
void
zline_stats(struct Client *sptr, const struct StatDesc *sd,
char *param)
{
struct Zline *zline;
struct Zline *szline;
zliter(GlobalZlineList, zline, szline) {
send_reply(sptr, RPL_STATSZLINE, 'Z',
zline->zl_mask, zline->zl_expire,
zline->zl_lastmod, zline->zl_lifetime,
zline->zl_state == ZLOCAL_ACTIVATED ? ">" :
(zline->zl_state == ZLOCAL_DEACTIVATED ? "<" : ""),
ZlineIsRemActive(zline) ? '+' : '-',
zline->zl_reason);
}
}
/** Calculate memory used by Z-lines.
* @param[out] zl_size Number of bytes used by Z-lines.
* @return Number of Z-lines in use.
*/
int
zline_memory_count(size_t *zl_size)
{
struct Zline *zline;
unsigned int zl = 0;
for (zline = GlobalZlineList; zline; zline = zline->zl_next) {
zl++;
*zl_size += sizeof(struct Zline);
*zl_size += zline->zl_mask ? (strlen(zline->zl_mask) + 1) : 0;
*zl_size += zline->zl_reason ? (strlen(zline->zl_reason) + 1) : 0;
}
return zl;
}
/** Remove a zline with a specified mask.
* @param[in] sptr Client issuing the removal request.
* @param[in] ipmask ZLine to be removed.
* @param[in] reason Reason for the removal.
*/
int
zline_remove(struct Client* sptr, char *ipmask, char *reason)
{
char imask[HOSTLEN + 2];
struct Zline *zline, *szline;
char *mask, *t_uh;
DupString(t_uh, ipmask);
mask = t_uh;
if (sizeof(imask) <
ircd_snprintf(0, imask, sizeof(imask), "%s", mask))
return send_reply(sptr, ERR_LONGMASK);
for (zline = GlobalZlineList; zline; zline = szline) {
szline = zline->zl_next;
if (zline->zl_expire <= CurrentTime)
zline_free(zline);
else if (((zline->zl_mask && mask && ircd_strcmp(zline->zl_mask,mask) == 0)
||(!zline->zl_mask && !mask))) {
sendto_opmask_butone(0, SNO_GLINE, "%s force removing ZLINE for %s (%s)",
feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr) ?
cli_name(sptr) : cli_name((cli_user(sptr))->server),
imask, reason);
log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
"%#C force removing ZLINE for %s (%s)", sptr, imask, reason);
zline_free(zline);
}
}
if (!BadPtr(t_uh))
MyFree(t_uh);
return 0;
}
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