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ircu2/ircd/shun.c

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/*
* IRC - Internet Relay Chat, ircd/shun.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 Shun manipulation functions.
* @version $Id: shun.c 1936 2010-01-07 02:55:33Z entrope $
*/
#include "config.h"
#include "shun.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 Shuns. */
struct Shun* GlobalShunList = 0;
/** Iterate through \a list of Shuns. Use this like a for loop,
* i.e., follow it with braces and use whatever you passed as \a sh
* as a single Shun to be acted upon.
*
* @param[in] list List of Shuns to iterate over.
* @param[in] sh Name of a struct Shun pointer variable that will be made to point to the Shuns in sequence.
* @param[in] next Name of a scratch struct Shun 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 shiter(list, sh, next) \
/* Iterate through the Shuns in the list */ \
for ((sh) = (list); (sh); (sh) = (next)) \
/* Figure out the next pointer in list... */ \
if ((((next) = (sh)->sh_next) || 1) && \
/* Then see if it's expired */ \
(sh)->sh_lifetime <= TStime()) \
/* Record has expired, so free the Shun */ \
shun_free((sh)); \
/* See if we need to expire the Shun */ \
else if ((((sh)->sh_expire > TStime()) || \
(((sh)->sh_flags &= ~SHUN_ACTIVE) && 0) || \
((sh)->sh_state = SLOCAL_GLOBAL)) && 0) \
; /* empty statement */ \
else
/** Find canonical user and host for a string.
* If \a userhost starts with '$', assign \a userhost to *user_p and NULL to *host_p.
* Otherwise, if \a userhost contains '@', assign the earlier part of it to *user_p and the rest to *host_p.
* Otherwise, assign \a def_user to *user_p and \a userhost to *host_p.
*
* @param[in] userhost Input string from user.
* @param[out] user_p Gets pointer to user (or channel/realname) part of hostmask.
* @param[out] host_p Gets point to host part of hostmask (may be assigned NULL).
* @param[in] def_user Default value for user part.
*/
static void
canon_userhost(char *userhost, char **user_p, char **host_p, char *def_user)
{
char *tmp;
if (*userhost == '$') {
*user_p = userhost;
*host_p = NULL;
return;
}
if (!(tmp = strchr(userhost, '@'))) {
*user_p = def_user;
*host_p = userhost;
} else {
*user_p = userhost;
*(tmp++) = '\0';
*host_p = tmp;
}
}
/** Create a Shun structure.
* @param[in] user User part of mask.
* @param[in] host Host part of mask (NULL if not applicable).
* @param[in] reason Reason for Shun.
* @param[in] expire Expiration timestamp.
* @param[in] lastmod Last modification timestamp.
* @param[in] flags Bitwise combination of SHUN_* bits.
* @return Newly allocated Shun.
*/
static struct Shun *
make_shun(char *user, char *host, char *reason, time_t expire, time_t lastmod,
time_t lifetime, unsigned int flags)
{
struct Shun *shun;
assert(0 != expire);
shun = (struct Shun *)MyMalloc(sizeof(struct Shun)); /* alloc memory */
assert(0 != shun);
DupString(shun->sh_reason, reason); /* initialize shun... */
shun->sh_expire = expire;
shun->sh_lifetime = lifetime;
shun->sh_lastmod = lastmod;
shun->sh_flags = flags & SHUN_MASK;
shun->sh_state = SLOCAL_GLOBAL; /* not locally modified */
DupString(shun->sh_user, user); /* remember them... */
if (*user != '$')
DupString(shun->sh_host, host);
else
shun->sh_host = NULL;
if (*user != '$' && ipmask_parse(host, &shun->sh_addr, &shun->sh_bits)) {
shun->sh_flags |= SHUN_IPMASK;
shun->sh_addr = ipmask_clean(&shun->sh_addr, shun->sh_bits);
}
shun->sh_next = GlobalShunList; /* then link it into list */
shun->sh_prev_p = &GlobalShunList;
if (GlobalShunList)
GlobalShunList->sh_prev_p = &shun->sh_next;
GlobalShunList = shun;
return shun;
}
/** Check local clients against a new Shun.
* If the Shun is inactive, return immediately.
* Otherwise, if any users match it, disconnect them.
* @param[in] cptr Peer connect that sent the Shun.
* @param[in] sptr Client that originated the Shun.
* @param[in] shun New Shun to check.
* @return Zero, unless \a sptr Shunned himself, in which case CPTR_KILLED.
*/
static int
do_shun(struct Client *cptr, struct Client *sptr, struct Shun *shun)
{
struct Client *acptr;
int fd;
if (feature_bool(FEAT_DISABLE_SHUNS))
return 0; /* Shuns are disabled */
if (!ShunIsActive(shun)) /* no action taken on inactive shuns */
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_SHUN))
continue;
if (ShunIsRealName(shun)) { /* Realname Shun */
Debug((DEBUG_DEBUG,"Realname Shun: %s %s",(cli_info(acptr)),
shun->sh_user+2));
if (match(shun->sh_user+2, cli_info(acptr)) != 0)
continue;
Debug((DEBUG_DEBUG,"Matched!"));
} else if (ShunIsVersion(shun)) { /* CTCP Version Shun */
Debug((DEBUG_DEBUG,"CTCP Version Shun: %s %s",(cli_version(acptr)),
shun->sh_user+2));
if (EmptyString(cli_version(acptr)) || (match(shun->sh_user+2, cli_version(acptr)) != 0))
continue;
Debug((DEBUG_DEBUG,"Matched!"));
} else { /* Host/IP shun */
if (*(cli_user(acptr)->username) &&
match(shun->sh_user, (cli_user(acptr))->username) != 0)
continue;
if (ShunIsIpMask(shun)) {
if (!irc_in_addr_type_cmp(&cli_ip(acptr), &shun->sh_addr) && shun->sh_bits)
continue;
if (!ipmask_check(&cli_ip(acptr), &shun->sh_addr, shun->sh_bits))
continue;
}
else {
if ((match(shun->sh_host, cli_sockhost(acptr)) != 0) &&
(match(shun->sh_host, ircd_ntoa(&cli_ip(acptr))) != 0))
continue;
}
}
/* ok, here's one that got Shunned */
if (!feature_bool(FEAT_HIS_SHUN_REASON))
sendcmdto_one(&me, CMD_NOTICE, acptr, "%C :You are shunned: %s", acptr,
shun->sh_reason);
/* let the ops know about it */
sendto_opmask_butone_global(&me, SNO_GLINE, "Shun active for %s",
get_client_name(acptr, SHOW_IP));
}
}
return 0;
}
/**
* Implements the mask checking applied to local Shuns.
* 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 Shun mask to check.
* @return One of CHECK_REJECTED, CHECK_OVERRIDABLE, or CHECK_APPROVED.
*/
static int
shun_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 Shun to other servers.
* @param[in] cptr Client that sent us the Shun.
* @param[in] sptr Client that originated the Shun.
* @param[in] shun Shun to forward.
* @return Zero.
*/
static int
shun_propagate(struct Client *cptr, struct Client *sptr, struct Shun *shun)
{
if (ShunIsLocal(shun))
return 0;
assert(shun->sh_lastmod);
sendcmdto_serv_butone(sptr, CMD_SHUN, cptr, "* %c%s%s%s %Tu %Tu %Tu :%s",
ShunIsRemActive(shun) ? '+' : '-', shun->sh_user,
shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "",
shun->sh_expire - TStime(), shun->sh_lastmod,
shun->sh_lifetime, shun->sh_reason);
return 0;
}
/** Count number of users who match \a mask.
* @param[in] mask user\@host or user\@ip mask to check.
* @param[in] flags Bitmask possibly containing the value SHUN_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 namebuf[USERLEN + HOSTLEN + 2];
char ipbuf[USERLEN + 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 & SHUN_LOCAL) && !MyConnect(acptr))
continue;
ircd_snprintf(0, namebuf, sizeof(namebuf), "%s@%s",
cli_user(acptr)->username, cli_user(acptr)->host);
ircd_snprintf(0, ipbuf, sizeof(ipbuf), "%s@%s", cli_user(acptr)->username,
ircd_ntoa(&cli_ip(acptr)));
if (!match(mask, namebuf)
|| !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;
}
/** Count number of users with a realname matching \a mask.
* @param[in] mask Wildcard mask to match against realnames.
* @return Count of matching users.
*/
static int
count_realnames(const char *mask)
{
struct Client *acptr;
int minlen;
int count;
char cmask[BUFSIZE];
count = 0;
matchcomp(cmask, &minlen, NULL, mask);
for (acptr = GlobalClientList; acptr; acptr = cli_next(acptr)) {
if (!IsUser(acptr))
continue;
if (strlen(cli_info(acptr)) < minlen)
continue;
if (!matchexec(cli_info(acptr), cmask, minlen))
count++;
}
return count;
}
/** Count number of users with a CTCP version matching \a mask.
* @param[in] mask Wildcard mask to match against CTCP versions.
* @return Count of matching users.
*/
static int
count_versions(const char *mask)
{
struct Client *acptr;
int minlen;
int count;
char cmask[BUFSIZE];
count = 0;
matchcomp(cmask, &minlen, NULL, mask);
for (acptr = GlobalClientList; acptr; acptr = cli_next(acptr)) {
if (!IsUser(acptr))
continue;
if (EmptyString(cli_version(acptr)))
continue;
if (strlen(cli_version(acptr)) < minlen)
continue;
if (!matchexec(cli_version(acptr), cmask, minlen))
count++;
}
return count;
}
/** Create a new Shun and add it to global lists.
* \a userhost may be in one of four forms:
* \li A string starting with $R and followed by a mask to match against their realname.
* \li A string starting with $V and followed by a mask to match against their CTCP version.
* \li A user\@IP mask (user\@ part optional) to create an IP-based ban.
* \li A user\@host mask (user\@ part optional) to create a hostname ban.
*
* @param[in] cptr Client that sent us the Shun.
* @param[in] sptr Client that originated the Shun.
* @param[in] userhost Text mask for the Shun.
* @param[in] reason Reason for Shun.
* @param[in] expire Expiration time of Shun.
* @param[in] lastmod Last modification time of Shun.
* @param[in] lifetime Lifetime of Shun.
* @param[in] flags Bitwise combination of SHUN_* flags.
* @return Zero or CPTR_KILLED, depending on whether \a sptr is suicidal.
*/
int
shun_add(struct Client *cptr, struct Client *sptr, char *userhost,
char *reason, time_t expire, time_t lastmod, time_t lifetime,
unsigned int flags)
{
struct Shun *ashun;
char uhmask[USERLEN + HOSTLEN + 2];
char *user, *host;
int tmp;
assert(0 != userhost);
assert(0 != reason);
assert(((flags & (SHUN_GLOBAL | SHUN_LOCAL)) == SHUN_GLOBAL) ||
((flags & (SHUN_GLOBAL | SHUN_LOCAL)) == SHUN_LOCAL));
Debug((DEBUG_DEBUG, "shun_add(\"%s\", \"%s\", \"%s\", \"%s\", %Tu, %Tu "
"%Tu, 0x%04x)", cli_name(cptr), cli_name(sptr), userhost, reason,
expire, lastmod, lifetime, flags));
if (*userhost == '$') {
switch (userhost[1]) {
case 'R': flags |= SHUN_REALNAME; break;
case 'V': flags |= SHUN_VERSION; break;
default:
/* uh, what to do here? */
/* The answer, my dear Watson, is we throw a protocol_violation()
-- hikari */
if (IsServer(cptr))
return protocol_violation(sptr,"%s has been smoking the sweet leaf and sent me a whacky shun",cli_name(sptr));
sendto_opmask_butone(NULL, SNO_GLINE, "%s has been smoking the sweet leaf and sent me a whacky shun", cli_name(sptr));
return 0;
}
user = userhost;
host = NULL;
if (MyUser(sptr) || (IsUser(sptr) && flags & SHUN_LOCAL)) {
if (flags & SHUN_VERSION)
tmp = count_versions(userhost + 2);
else
tmp = count_realnames(userhost + 2);
if ((tmp >= feature_int(FEAT_SHUNMAXUSERCOUNT))
&& !(flags & SHUN_OPERFORCE))
return send_reply(sptr, ERR_TOOMANYUSERS, tmp);
}
} else {
canon_userhost(userhost, &user, &host, "*");
if (sizeof(uhmask) <
ircd_snprintf(0, uhmask, sizeof(uhmask), "%s@%s", user, host))
return send_reply(sptr, ERR_LONGMASK);
else if (MyUser(sptr) || (IsUser(sptr) && flags & SHUN_LOCAL)) {
switch (shun_checkmask(host)) {
case CHECK_OVERRIDABLE: /* oper overrided restriction */
if (flags & SHUN_OPERFORCE)
break;
/*FALLTHROUGH*/
case CHECK_REJECTED:
return send_reply(sptr, ERR_MASKTOOWIDE, uhmask);
break;
}
if ((tmp = count_users(uhmask, flags)) >=
feature_int(FEAT_SHUNMAXUSERCOUNT) && !(flags & SHUN_OPERFORCE))
return send_reply(sptr, ERR_TOOMANYUSERS, tmp);
}
}
/*
* You cannot set a negative (or zero) expire time, nor can you set an
* expiration time for greater than SHUN_MAX_EXPIRE.
*/
if (!(flags & SHUN_FORCE) &&
(expire <= TStime() || expire > TStime() + SHUN_MAX_EXPIRE)) {
if (!IsServer(sptr) && MyConnect(sptr))
send_reply(sptr, ERR_BADEXPIRE, expire);
return 0;
} else if (expire <= TStime()) {
/* This expired Shun was forced to be added, so mark it inactive. */
flags &= ~SHUN_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 SHUN for %s%s%s, expiring at "
"%Tu: %s",
(feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
cli_name(sptr) :
cli_name((cli_user(sptr))->server),
(flags & SHUN_ACTIVE) ? "" : "deactivated ",
(flags & SHUN_LOCAL) ? "local" : "global", user,
(flags & (SHUN_REALNAME|SHUN_VERSION)) ? "" : "@",
(flags & (SHUN_REALNAME|SHUN_VERSION)) ? "" : host,
expire, reason);
/* and log it */
log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
"%#C adding %s SHUN for %s%s%s, expiring at %Tu: %s", sptr,
flags & SHUN_LOCAL ? "local" : "global", user,
flags & (SHUN_REALNAME|SHUN_VERSION) ? "" : "@",
flags & (SHUN_REALNAME|SHUN_VERSION) ? "" : host,
expire, reason);
/* make the shun */
ashun = make_shun(user, host, reason, expire, lastmod, lifetime, flags);
/* since we've disabled overlapped Shun checking, ashun should
* never be NULL...
*/
assert(ashun);
shun_propagate(cptr, sptr, ashun);
return do_shun(cptr, sptr, ashun); /* knock off users if necessary */
}
/** Activate a currently inactive Shun.
* @param[in] cptr Peer that told us to activate the Shun.
* @param[in] sptr Client that originally thought it was a good idea.
* @param[in] shun Shun to activate.
* @param[in] lastmod New value for last modification timestamp.
* @param[in] flags 0 if the activation should be propagated, SHUN_LOCAL if not.
* @return Zero, unless \a sptr had a death wish (in which case CPTR_KILLED).
*/
int
shun_activate(struct Client *cptr, struct Client *sptr, struct Shun *shun,
time_t lastmod, unsigned int flags)
{
unsigned int saveflags = 0;
assert(0 != shun);
saveflags = shun->sh_flags;
if (flags & SHUN_LOCAL)
shun->sh_flags &= ~SHUN_LDEACT;
else {
shun->sh_flags |= SHUN_ACTIVE;
if (shun->sh_lastmod) {
if (shun->sh_lastmod >= lastmod) /* force lastmod to increase */
shun->sh_lastmod++;
else
shun->sh_lastmod = lastmod;
}
}
if ((saveflags & SHUN_ACTMASK) == SHUN_ACTIVE)
return 0; /* was active to begin with */
/* Inform ops and log it */
sendto_opmask_butone(0, SNO_GLINE, "%s activating global SHUN for %s%s%s, "
"expiring at %Tu: %s",
(feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
cli_name(sptr) :
cli_name((cli_user(sptr))->server),
shun->sh_user, shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "",
shun->sh_expire, shun->sh_reason);
log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
"%#C activating global SHUN for %s%s%s, expiring at %Tu: %s", sptr,
shun->sh_user,
shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "",
shun->sh_expire, shun->sh_reason);
if (!(flags & SHUN_LOCAL)) /* don't propagate local changes */
shun_propagate(cptr, sptr, shun);
return do_shun(cptr, sptr, shun);
}
/** Deactivate a Shun.
* @param[in] cptr Peer that gave us the message.
* @param[in] sptr Client that initiated the deactivation.
* @param[in] shun Shun to deactivate.
* @param[in] lastmod New value for Shun last modification timestamp.
* @param[in] flags SHUN_LOCAL to only deactivate locally, 0 to propagate.
* @return Zero.
*/
int
shun_deactivate(struct Client *cptr, struct Client *sptr, struct Shun *shun,
time_t lastmod, unsigned int flags)
{
unsigned int saveflags = 0;
char *msg;
assert(0 != shun);
saveflags = shun->sh_flags;
if (ShunIsLocal(shun))
msg = "removing local";
else if (!shun->sh_lastmod && !(flags & SHUN_LOCAL)) {
msg = "removing global";
shun->sh_flags &= ~SHUN_ACTIVE; /* propagate a -<mask> */
} else {
msg = "deactivating global";
if (flags & SHUN_LOCAL)
shun->sh_flags |= SHUN_LDEACT;
else {
shun->sh_flags &= ~SHUN_ACTIVE;
if (shun->sh_lastmod) {
if (shun->sh_lastmod >= lastmod)
shun->sh_lastmod++;
else
shun->sh_lastmod = lastmod;
}
}
if ((saveflags & SHUN_ACTMASK) != SHUN_ACTIVE)
return 0; /* was inactive to begin with */
}
/* Inform ops and log it */
sendto_opmask_butone(0, SNO_GLINE, "%s %s SHUN for %s%s%s, expiring at %Tu: "
"%s",
(feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
cli_name(sptr) :
cli_name((cli_user(sptr))->server), msg,
shun->sh_user, shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "",
shun->sh_expire, shun->sh_reason);
log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
"%#C %s SHUN for %s%s%s, expiring at %Tu: %s", sptr, msg,
shun->sh_user,
shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "",
shun->sh_expire, shun->sh_reason);
if (!(flags & SHUN_LOCAL)) /* don't propagate local changes */
shun_propagate(cptr, sptr, shun);
/* if it's a local shun or a Uworld shun (and not locally deactivated).. */
if (ShunIsLocal(shun) || (!shun->sh_lastmod && !(flags & SHUN_LOCAL)))
shun_free(shun); /* get rid of it */
return 0;
}
/** Modify a global Shun.
* @param[in] cptr Client that sent us the Shun modification.
* @param[in] sptr Client that originated the Shun modification.
* @param[in] shun Shun being modified.
* @param[in] action Resultant status of the Shun.
* @param[in] reason Reason for Shun.
* @param[in] expire Expiration time of Shun.
* @param[in] lastmod Last modification time of Shun.
* @param[in] lifetime Lifetime of Shun.
* @param[in] flags Bitwise combination of SHUN_* flags.
* @return Zero or CPTR_KILLED, depending on whether \a sptr is suicidal.
*/
int
shun_modify(struct Client *cptr, struct Client *sptr, struct Shun *shun,
enum ShunAction action, char *reason, time_t expire,
time_t lastmod, time_t lifetime, unsigned int flags)
{
char buf[BUFSIZE], *op = "";
int pos = 0;
assert(shun);
assert(!ShunIsLocal(shun));
Debug((DEBUG_DEBUG, "shun_modify(\"%s\", \"%s\", \"%s%s%s\", %s, \"%s\", "
"%Tu, %Tu, %Tu, 0x%04x)", cli_name(cptr), cli_name(sptr),
shun->sh_user, shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "",
action == SHUN_ACTIVATE ? "SHUN_ACTIVATE" :
(action == SHUN_DEACTIVATE ? "SHUN_DEACTIVATE" :
(action == SHUN_LOCAL_ACTIVATE ? "SHUN_LOCAL_ACTIVATE" :
(action == SHUN_LOCAL_DEACTIVATE ? "SHUN_LOCAL_DEACTIVATE" :
(action == SHUN_MODIFY ? "SHUN_MODIFY" : "<UNKNOWN>")))),
reason, expire, lastmod, lifetime, flags));
/* First, let's check lastmod... */
if (action != SHUN_LOCAL_ACTIVATE && action != SHUN_LOCAL_DEACTIVATE) {
if (ShunLastMod(shun) > lastmod) { /* we have a more recent version */
if (IsBurstOrBurstAck(cptr))
return 0; /* middle of a burst, it'll resync on its own */
return shun_resend(cptr, shun); /* resync the server */
} else if (ShunLastMod(shun) == lastmod)
return 0; /* we have that version of the Shun... */
}
/* All right, we know that there's a change of some sort. What is it? */
/* first, check out the expiration time... */
if ((flags & SHUN_EXPIRE) && expire) {
if (!(flags & SHUN_FORCE) &&
(expire <= TStime() || expire > TStime() + SHUN_MAX_EXPIRE)) {
if (!IsServer(sptr) && MyConnect(sptr)) /* bad expiration time */
send_reply(sptr, ERR_BADEXPIRE, expire);
return 0;
}
} else
flags &= ~SHUN_EXPIRE;
/* Now check to see if there's any change... */
if ((flags & SHUN_EXPIRE) && expire == shun->sh_expire) {
flags &= ~SHUN_EXPIRE; /* no change to expiration time... */
expire = 0;
}
/* Next, check out lifetime--this one's a bit trickier... */
if (!(flags & SHUN_LIFETIME) || !lifetime)
lifetime = shun->sh_lifetime; /* use Shun lifetime */
lifetime = IRCD_MAX(lifetime, expire); /* set lifetime to the max */
/* OK, let's see which is greater... */
if (lifetime > shun->sh_lifetime)
flags |= SHUN_LIFETIME; /* have to update lifetime */
else {
flags &= ~SHUN_LIFETIME; /* no change to lifetime */
lifetime = 0;
}
/* Finally, let's see if the reason needs to be updated */
if ((flags & SHUN_REASON) && reason &&
!ircd_strcmp(shun->sh_reason, reason))
flags &= ~SHUN_REASON; /* no changes to the reason */
/* OK, now let's take a look at the action... */
if ((action == SHUN_ACTIVATE && (shun->sh_flags & SHUN_ACTIVE)) ||
(action == SHUN_DEACTIVATE && !(shun->sh_flags & SHUN_ACTIVE)) ||
(action == SHUN_LOCAL_ACTIVATE &&
(shun->sh_state == SLOCAL_ACTIVATED)) ||
(action == SHUN_LOCAL_DEACTIVATE &&
(shun->sh_state == SLOCAL_DEACTIVATED)) ||
/* can't activate an expired Shun */
IRCD_MAX(shun->sh_expire, expire) <= TStime())
action = SHUN_MODIFY; /* no activity state modifications */
Debug((DEBUG_DEBUG, "About to perform changes; flags 0x%04x, action %s",
flags, action == SHUN_ACTIVATE ? "SHUN_ACTIVATE" :
(action == SHUN_DEACTIVATE ? "SHUN_DEACTIVATE" :
(action == SHUN_LOCAL_ACTIVATE ? "SHUN_LOCAL_ACTIVATE" :
(action == SHUN_LOCAL_DEACTIVATE ? "SHUN_LOCAL_DEACTIVATE" :
(action == SHUN_MODIFY ? "SHUN_MODIFY" : "<UNKNOWN>"))))));
/* If there are no changes to perform, do no changes */
if (!(flags & SHUN_UPDATE) && action == SHUN_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 != SHUN_LOCAL_ACTIVATE && action != SHUN_LOCAL_DEACTIVATE)
shun->sh_lastmod = lastmod;
/* Then move on to activity status changes... */
switch (action) {
case SHUN_ACTIVATE: /* Globally activating Shun */
shun->sh_flags |= SHUN_ACTIVE; /* make it active... */
shun->sh_state = SLOCAL_GLOBAL; /* reset local activity state */
pos += ircd_snprintf(0, buf, sizeof(buf), " globally activating Shun");
op = "+"; /* operation for Shun propagation */
break;
case SHUN_DEACTIVATE: /* Globally deactivating Shun */
shun->sh_flags &= ~SHUN_ACTIVE; /* make it inactive... */
shun->sh_state = SLOCAL_GLOBAL; /* reset local activity state */
pos += ircd_snprintf(0, buf, sizeof(buf), " globally deactivating Shun");
op = "-"; /* operation for Shun propagation */
break;
case SHUN_LOCAL_ACTIVATE: /* Locally activating Shun */
shun->sh_state = SLOCAL_ACTIVATED; /* make it locally active */
pos += ircd_snprintf(0, buf, sizeof(buf), " locally activating Shun");
break;
case SHUN_LOCAL_DEACTIVATE: /* Locally deactivating Shun */
shun->sh_state = SLOCAL_DEACTIVATED; /* make it locally inactive */
pos += ircd_snprintf(0, buf, sizeof(buf), " locally deactivating Shun");
break;
case SHUN_MODIFY: /* no change to activity status */
break;
}
/* Handle expiration changes... */
if (flags & SHUN_EXPIRE) {
shun->sh_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 & (SHUN_LIFETIME | SHUN_REASON)) ?
" and" : "", expire);
}
/* Next, handle lifetime changes... */
if (flags & SHUN_LIFETIME) {
shun->sh_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 & SHUN_REASON) ?
" and" : "", lifetime);
}
/* Now, handle reason changes... */
if (flags & SHUN_REASON) {
MyFree(shun->sh_reason); /* release old reason */
DupString(shun->sh_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... */
sendto_opmask_butone(0, SNO_GLINE, "%s modifying global SHUN for %s%s%s:%s",
(feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
cli_name(sptr) : cli_name((cli_user(sptr))->server),
shun->sh_user, shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "", buf);
/* and log the change */
log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
"%#C modifying global SHUN for %s%s%s:%s", sptr,
shun->sh_user,
shun->sh_host ? "@" : "", shun->sh_host ? shun->sh_host : "",
buf);
/* We'll be simple for this release, but we can update this to change
* the propagation syntax on future updates
*/
if (action != SHUN_LOCAL_ACTIVATE && action != SHUN_LOCAL_DEACTIVATE)
sendcmdto_serv_butone(sptr, CMD_SHUN, cptr,
"* %s%s%s%s%s %Tu %Tu %Tu :%s",
flags & SHUN_OPERFORCE ? "!" : "", op,
shun->sh_user, shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "",
shun->sh_expire - TStime(), shun->sh_lastmod,
shun->sh_lifetime, shun->sh_reason);
/* OK, let's do the Shun... */
return do_shun(cptr, sptr, shun);
}
/** Destroy a local Shun.
* @param[in] cptr Peer that gave us the message.
* @param[in] sptr Client that initiated the destruction.
* @param[in] shun Shun to destroy.
* @return Zero.
*/
int
shun_destroy(struct Client *cptr, struct Client *sptr, struct Shun *shun)
{
assert(shun);
assert(ShunIsLocal(shun));
/* Inform ops and log it */
sendto_opmask_butone(0, SNO_GLINE, "%s removing local SHUN for %s%s%s",
(feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr)) ?
cli_name(sptr) : cli_name((cli_user(sptr))->server),
shun->sh_user, shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "");
log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
"%#C removing local SHUN for %s%s%s", sptr,
shun->sh_user,
shun->sh_host ? "@" : "", shun->sh_host ? shun->sh_host : "");
shun_free(shun); /* get rid of the Shun */
return 0; /* convenience return */
}
/** Find a Shun for a particular mask, guided by certain flags.
* Certain bits in \a flags are interpreted specially:
* <dl>
* <dt>SHUN_ANY</dt><dd>Search user Shuns.</dd>
* <dt>SHUN_GLOBAL</dt><dd>Only match global Shuns.</dd>
* <dt>SHUN_LOCAL</dt><dd>Only match local Shuns.</dd>
* <dt>SHUN_LASTMOD</dt><dd>Only match Shuns with a last modification time.</dd>
* <dt>SHUN_EXACT</dt><dd>Require an exact match of Shun mask.</dd>
* <dt>anything else</dt><dd>Search user Shuns.</dd>
* </dl>
* @param[in] userhost Mask to search for.
* @param[in] flags Bitwise combination of SHUN_* flags.
* @return First matching Shun, or NULL if none are found.
*/
struct Shun *
shun_find(char *userhost, unsigned int flags)
{
struct Shun *shun = 0;
struct Shun *sshun;
char *user, *host, *t_uh;
DupString(t_uh, userhost);
canon_userhost(t_uh, &user, &host, "*");
shiter(GlobalShunList, shun, sshun) {
if ((flags & (ShunIsLocal(shun) ? SHUN_GLOBAL : SHUN_LOCAL)) ||
(flags & SHUN_LASTMOD && !shun->sh_lastmod))
continue;
else if (flags & SHUN_EXACT) {
if (((shun->sh_host && host && ircd_strcmp(shun->sh_host, host) == 0)
|| (!shun->sh_host && !host)) &&
(ircd_strcmp(shun->sh_user, user) == 0))
break;
} else {
if (((shun->sh_host && host && match(shun->sh_host, host) == 0)
|| (!shun->sh_host && !host)) &&
(match(shun->sh_user, user) == 0))
break;
}
}
MyFree(t_uh);
return shun;
}
/** Find a matching Shun for a user.
* @param[in] cptr Client to compare against.
* @param[in] flags Bitwise combination of SHUN_GLOBAL and/or
* SHUN_LASTMOD to limit matches.
* @return Matching Shun, or NULL if none are found.
*/
struct Shun *
shun_lookup(struct Client *cptr, unsigned int flags)
{
struct Shun *shun;
struct Shun *sshun;
if (find_except_conf(cptr, EFLAG_SHUN))
return 0;
shiter(GlobalShunList, shun, sshun) {
if ((flags & SHUN_GLOBAL && shun->sh_flags & SHUN_LOCAL) ||
(flags & SHUN_LASTMOD && !shun->sh_lastmod))
continue;
if (ShunIsRealName(shun)) {
Debug((DEBUG_DEBUG,"realname shun: '%s' '%s'",shun->sh_user,cli_info(cptr)));
if (match(shun->sh_user+2, cli_info(cptr)) != 0)
continue;
}
else if (ShunIsVersion(shun)){
Debug((DEBUG_DEBUG,"ctcp version shun: '%s' '%s'",shun->sh_user,cli_version(cptr)));
if (EmptyString(cli_version(cptr)) || (match(shun->sh_user+2, cli_version(cptr)) != 0))
continue;
}
else {
if (match(shun->sh_user, (cli_user(cptr))->username) != 0)
continue;
if (ShunIsIpMask(shun)) {
if (!irc_in_addr_type_cmp(&cli_ip(cptr), &shun->sh_addr) && shun->sh_bits)
continue;
if (!ipmask_check(&cli_ip(cptr), &shun->sh_addr, shun->sh_bits))
continue;
}
else {
if ((match(shun->sh_host, (cli_user(cptr))->realhost) != 0) &&
(match(shun->sh_host, cli_sock_ip(cptr)) != 0))
continue;
}
}
if (ShunIsActive(shun))
return shun;
}
/*
* No Shuns matched
*/
return 0;
}
/** Delink and free a Shun.
* @param[in] shun Shun to free.
*/
void
shun_free(struct Shun *shun)
{
assert(0 != shun);
*shun->sh_prev_p = shun->sh_next; /* squeeze this shun out */
if (shun->sh_next)
shun->sh_next->sh_prev_p = shun->sh_prev_p;
MyFree(shun->sh_user); /* free up the memory */
if (shun->sh_host)
MyFree(shun->sh_host);
MyFree(shun->sh_reason);
MyFree(shun);
}
/** Burst all known global Shuns to another server.
* @param[in] cptr Destination of burst.
*/
void
shun_burst(struct Client *cptr)
{
struct Shun *shun;
struct Shun *sshun;
shiter(GlobalShunList, shun, sshun) {
if (!ShunIsLocal(shun) && shun->sh_lastmod)
sendcmdto_one(&me, CMD_SHUN, cptr, "* %c%s%s%s %Tu %Tu %Tu :%s",
ShunIsRemActive(shun) ? '+' : '-', shun->sh_user,
shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "",
shun->sh_expire - TStime(), shun->sh_lastmod,
shun->sh_lifetime, shun->sh_reason);
}
}
/** Send a Shun to another server.
* @param[in] cptr Who to inform of the Shun.
* @param[in] shun Shun to send.
* @return Zero.
*/
int
shun_resend(struct Client *cptr, struct Shun *shun)
{
if (ShunIsLocal(shun) || !shun->sh_lastmod)
return 0;
sendcmdto_one(&me, CMD_SHUN, cptr, "* %c%s%s%s %Tu %Tu %Tu :%s",
ShunIsRemActive(shun) ? '+' : '-', shun->sh_user,
shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "",
shun->sh_expire - TStime(), shun->sh_lastmod,
shun->sh_lifetime, shun->sh_reason);
return 0;
}
/** Display one or all Shuns to a user.
* If \a userhost is not NULL, only send the first matching Shun.
* Otherwise send the whole list.
* @param[in] sptr User asking for Shun list.
* @param[in] userhost Shun mask to search for (or NULL).
* @return Zero.
*/
int
shun_list(struct Client *sptr, char *userhost)
{
struct Shun *shun;
struct Shun *sshun;
if (userhost) {
if (!(shun = shun_find(userhost, SHUN_ANY))) /* no such shun */
return send_reply(sptr, ERR_NOSUCHSHUN, userhost);
/* send shun information along */
send_reply(sptr, RPL_GLIST, shun->sh_user,
shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "",
shun->sh_expire, shun->sh_lastmod,
shun->sh_lifetime,
ShunIsLocal(shun) ? cli_name(&me) : "*",
shun->sh_state == SLOCAL_ACTIVATED ? ">" :
(shun->sh_state == SLOCAL_DEACTIVATED ? "<" : ""),
ShunIsRemActive(shun) ? '+' : '-', shun->sh_reason);
} else {
shiter(GlobalShunList, shun, sshun) {
send_reply(sptr, RPL_GLIST, shun->sh_user,
shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "",
shun->sh_expire, shun->sh_lastmod,
shun->sh_lifetime,
ShunIsLocal(shun) ? cli_name(&me) : "*",
shun->sh_state == SLOCAL_ACTIVATED ? ">" :
(shun->sh_state == SLOCAL_DEACTIVATED ? "<" : ""),
ShunIsRemActive(shun) ? '+' : '-', shun->sh_reason);
}
}
/* end of shun information */
return send_reply(sptr, RPL_ENDOFSLIST);
}
/** Statistics callback to list Shuns.
* @param[in] sptr Client requesting statistics.
* @param[in] sd Stats descriptor for request (ignored).
* @param[in] param Extra parameter from user (ignored).
*/
void
shun_stats(struct Client *sptr, const struct StatDesc *sd,
char *param)
{
struct Shun *shun;
struct Shun *sshun;
shiter(GlobalShunList, shun, sshun) {
send_reply(sptr, RPL_STATSSHUN, 'S', shun->sh_user,
shun->sh_host ? "@" : "",
shun->sh_host ? shun->sh_host : "",
shun->sh_expire, shun->sh_lastmod,
shun->sh_lifetime,
shun->sh_state == SLOCAL_ACTIVATED ? ">" :
(shun->sh_state == SLOCAL_DEACTIVATED ? "<" : ""),
ShunIsRemActive(shun) ? '+' : '-',
shun->sh_reason);
}
}
/** Calculate memory used by Shuns.
* @param[out] sh_size Number of bytes used by Shuns.
* @return Number of Shuns in use.
*/
int
shun_memory_count(size_t *sh_size)
{
struct Shun *shun;
unsigned int sh = 0;
for (shun = GlobalShunList; shun; shun = shun->sh_next) {
sh++;
*sh_size += sizeof(struct Shun);
*sh_size += shun->sh_user ? (strlen(shun->sh_user) + 1) : 0;
*sh_size += shun->sh_host ? (strlen(shun->sh_host) + 1) : 0;
*sh_size += shun->sh_reason ? (strlen(shun->sh_reason) + 1) : 0;
}
return sh;
}
/** Check for and remove any expired shuns.
*/
void expire_shuns(void)
{
struct Shun *shun;
struct Shun *sshun;
for (shun = GlobalShunList; shun; shun = sshun) { /* all shuns */
sshun = shun->sh_next;
if (shun->sh_expire <= CurrentTime) /* expire any that need expiring */
shun_free(shun);
}
}
/** Remove a shun with a specified mask.
* @param[in] sptr Client issuing the removal request
* @param[in] userhost Shun to be removed.
* @param[in] reason Reason for the removal.
*/
int
shun_remove(struct Client* sptr, char *userhost, char *reason)
{
char uhmask[USERLEN + HOSTLEN + 2];
struct Shun *shun, *sshun;
char *user, *host, *t_uh;
DupString(t_uh, userhost);
canon_userhost(t_uh, &user, &host, 0);
if(BadPtr(user))
return 0;
if (sizeof(uhmask) <
ircd_snprintf(0, uhmask, sizeof(uhmask), "%s@%s", user, host))
return send_reply(sptr, ERR_LONGMASK);
for (shun = GlobalShunList; shun; shun = sshun) {
sshun = shun->sh_next;
if (shun->sh_expire <= CurrentTime)
shun_free(shun);
else if (((shun->sh_host && host && ircd_strcmp(shun->sh_host,host) == 0)
||(!shun->sh_host && !host)) && ((!user && ircd_strcmp(shun->sh_user, "*") == 0) ||
ircd_strcmp(shun->sh_user, user) == 0)) {
sendto_opmask_butone(0, SNO_GLINE, "%s force removing SHUN for %s (%s)",
feature_bool(FEAT_HIS_SNOTICES) || IsServer(sptr) ?
cli_name(sptr) : cli_name((cli_user(sptr))->server),
uhmask, reason);
log_write(LS_GLINE, L_INFO, LOG_NOSNOTICE,
"%#C force removing SHUN for %s (%s)", sptr, uhmask, reason);
shun_free(shun);
}
}
if (!BadPtr(t_uh))
MyFree(t_uh);
return 0;
}
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