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elemental-ircd/modules/m_dline.c

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/*
* ircd-ratbox: A slightly useful ircd.
* m_dline.c: Bans/unbans a user.
*
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
* Copyright (C) 1996-2002 Hybrid Development Team
* Copyright (C) 2002-2005 ircd-ratbox development team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* $Id: m_dline.c 3225 2007-03-04 23:42:55Z jilles $
*/
#include "stdinc.h"
#include "channel.h"
#include "class.h"
#include "client.h"
#include "common.h"
#include "match.h"
#include "ircd.h"
#include "hostmask.h"
#include "numeric.h"
#include "s_conf.h"
#include "s_newconf.h"
#include "logger.h"
#include "send.h"
#include "hash.h"
#include "s_serv.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
static int mo_dline(struct Client *, struct Client *, int, const char **);
static int me_dline(struct Client *, struct Client *, int, const char **);
static int mo_undline(struct Client *, struct Client *, int, const char **);
static int me_undline(struct Client *, struct Client *, int, const char **);
struct Message dline_msgtab = {
"DLINE", 0, 0, 0, MFLG_SLOW,
{mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_dline, 3}, {mo_dline, 2}}
};
struct Message undline_msgtab = {
"UNDLINE", 0, 0, 0, MFLG_SLOW,
{mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_undline, 1}, {mo_undline, 2}}
};
mapi_clist_av1 dline_clist[] = { &dline_msgtab, &undline_msgtab, NULL };
DECLARE_MODULE_AV1(dline, NULL, NULL, dline_clist, NULL, NULL, "$Revision: 3225 $");
static int valid_comment(char *comment);
static int flush_write(struct Client *, FILE *, char *, char *);
static int remove_temp_dline(struct ConfItem *);
static int apply_dline(struct Client *, const char *, int, char *);
static int apply_undline(struct Client *, const char *);
/* mo_dline()
*
* parv[1] - dline to add
* parv[2] - reason
*/
static int
mo_dline(struct Client *client_p, struct Client *source_p,
int parc, const char *parv[])
{
char def[] = "No Reason";
const char *dlhost;
char *reason = def;
char cidr_form_host[HOSTLEN + 1];
int tdline_time = 0;
const char *target_server = NULL;
int loc = 1;
if(!IsOperK(source_p))
{
sendto_one(source_p, form_str(ERR_NOPRIVS),
me.name, source_p->name, "kline");
return 0;
}
if((tdline_time = valid_temp_time(parv[loc])) >= 0)
loc++;
dlhost = parv[loc];
rb_strlcpy(cidr_form_host, dlhost, sizeof(cidr_form_host));
loc++;
if(parc >= loc+2 && !irccmp(parv[loc], "ON"))
{
if(!IsOperRemoteBan(source_p))
{
sendto_one(source_p, form_str(ERR_NOPRIVS),
me.name, source_p->name, "remoteban");
return 0;
}
target_server = parv[loc+1];
loc += 2;
}
if(parc >= loc + 1 && !EmptyString(parv[loc]))
reason = LOCAL_COPY(parv[loc]);
if(target_server != NULL)
{
sendto_match_servs(source_p, target_server,
CAP_ENCAP, NOCAPS,
"ENCAP %s DLINE %d %s :%s",
target_server, tdline_time, dlhost, reason);
if(!match(target_server, me.name))
return 0;
}
apply_dline(source_p, dlhost, tdline_time, reason);
check_dlines();
return 0;
}
/* mo_undline()
*
* parv[1] = dline to remove
*/
static int
mo_undline(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
const char *cidr;
const char *target_server = NULL;
if(!IsOperK(source_p))
{
sendto_one(source_p, form_str(ERR_NOPRIVS),
me.name, source_p->name, "unkline");
return 0;
}
cidr = parv[1];
if(parc >= 4 && !irccmp(parv[2], "ON"))
{
if(!IsOperRemoteBan(source_p))
{
sendto_one(source_p, form_str(ERR_NOPRIVS),
me.name, source_p->name, "remoteban");
return 0;
}
target_server = parv[3];
sendto_match_servs(source_p, target_server,
CAP_ENCAP, NOCAPS,
"ENCAP %s UNDLINE %s",
target_server, cidr);
if(!match(target_server, me.name))
return 0;
}
apply_undline(source_p, cidr);
return 0;
}
static int
me_dline(struct Client *client_p, struct Client *source_p, int parc, const char **parv)
{
int tdline_time = atoi(parv[1]);
/* Since this is coming over a server link, assume that the originating
* server did the relevant permission/sanity checks...
*/
if(!IsPerson(source_p))
return 0;
if(!find_shared_conf(source_p->username, source_p->host,
source_p->servptr->name, tdline_time > 0 ? SHARED_TDLINE : SHARED_PDLINE))
return 0;
apply_dline(source_p, parv[2], tdline_time, LOCAL_COPY(parv[3]));
check_dlines();
return 0;
}
static int
me_undline(struct Client *client_p, struct Client *source_p, int parc, const char **parv)
{
if(!IsPerson(source_p))
return 0;
if(!find_shared_conf(source_p->username, source_p->host,
source_p->servptr->name, SHARED_UNDLINE))
return 0;
apply_undline(source_p, parv[1]);
return 0;
}
static int
apply_dline(struct Client *source_p, const char *dlhost, int tdline_time, char *reason)
{
struct ConfItem *aconf;
char *oper_reason;
char dlbuffer[IRCD_BUFSIZE];
const char *current_date;
struct rb_sockaddr_storage daddr;
int t = AF_INET, ty, b;
const char *creason;
ty = parse_netmask(dlhost, (struct sockaddr *)&daddr, &b);
if(ty == HM_HOST)
{
sendto_one(source_p, ":%s NOTICE %s :Invalid D-Line",
me.name, source_p->name);
return 0;
}
#ifdef RB_IPV6
if(ty == HM_IPV6)
t = AF_INET6;
else
#endif
t = AF_INET;
/* This means dlines wider than /16 cannot be set remotely */
if(IsOperAdmin(source_p))
{
if(b < 8)
{
sendto_one_notice(source_p,
":For safety, bitmasks less than 8 require conf access.");
return 0;
}
}
else
{
if(b < 16)
{
sendto_one_notice(source_p,
":Dline bitmasks less than 16 are for admins only.");
return 0;
}
}
if(!valid_comment(reason))
{
sendto_one(source_p,
":%s NOTICE %s :Invalid character '\"' in comment",
me.name, source_p->name);
return 0;
}
/* Look for an oper reason */
if((oper_reason = strchr(reason, '|')) != NULL)
{
*oper_reason = '\0';
oper_reason++;
if(!EmptyString(oper_reason))
aconf->spasswd = rb_strdup(oper_reason);
}
if(ConfigFileEntry.non_redundant_klines)
{
if((aconf = find_dline((struct sockaddr *)&daddr, t)) != NULL)
{
int bx;
parse_netmask(aconf->host, NULL, &bx);
if(b >= bx)
{
creason = aconf->passwd ? aconf->passwd : "<No Reason>";
if(IsConfExemptKline(aconf))
sendto_one(source_p,
":%s NOTICE %s :[%s] is (E)d-lined by [%s] - %s",
me.name, source_p->name, dlhost, aconf->host, creason);
else
sendto_one(source_p,
":%s NOTICE %s :[%s] already D-lined by [%s] - %s",
me.name, source_p->name, dlhost, aconf->host, creason);
return 0;
}
}
}
rb_set_time();
current_date = smalldate();
aconf = make_conf();
aconf->status = CONF_DLINE;
aconf->host = rb_strdup(dlhost);
if(tdline_time > 0)
{
rb_snprintf(dlbuffer, sizeof(dlbuffer),
"Temporary D-line %d min. - %s (%s)",
(int) (tdline_time / 60), reason, current_date);
aconf->passwd = rb_strdup(dlbuffer);
aconf->hold = rb_current_time() + tdline_time;
add_temp_dline(aconf);
if(EmptyString(oper_reason))
{
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"%s added temporary %d min. D-Line for [%s] [%s]",
get_oper_name(source_p), tdline_time / 60,
aconf->host, reason);
ilog(L_KLINE, "D %s %d %s %s",
get_oper_name(source_p), tdline_time / 60,
aconf->host, reason);
}
else
{
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"%s added temporary %d min. D-Line for [%s] [%s|%s]",
get_oper_name(source_p), tdline_time / 60,
aconf->host, reason, oper_reason);
ilog(L_KLINE, "D %s %d %s %s|%s",
get_oper_name(source_p), tdline_time / 60,
aconf->host, reason, oper_reason);
}
sendto_one(source_p, ":%s NOTICE %s :Added temporary %d min. D-Line for [%s]",
me.name, source_p->name, tdline_time / 60, aconf->host);
}
else
{
rb_snprintf(dlbuffer, sizeof(dlbuffer), "%s (%s)", reason, current_date);
aconf->passwd = rb_strdup(dlbuffer);
add_conf_by_address(aconf->host, CONF_DLINE, NULL, NULL, aconf);
write_confitem(DLINE_TYPE, source_p, NULL, aconf->host, reason,
oper_reason, current_date, 0);
}
return 0;
}
static int
apply_undline(struct Client *source_p, const char *cidr)
{
FILE *in;
FILE *out;
char buf[BUFSIZE], buff[BUFSIZE], temppath[BUFSIZE], *p;
const char *filename, *found_cidr;
int pairme = NO, error_on_write = NO;
mode_t oldumask;
struct ConfItem *aconf;
if(parse_netmask(cidr, NULL, NULL) == HM_HOST)
{
sendto_one_notice(source_p, ":Invalid D-Line");
return 0;
}
rb_snprintf(temppath, sizeof(temppath), "%s.tmp", ConfigFileEntry.dlinefile);
aconf = find_exact_conf_by_address(cidr, CONF_DLINE, NULL);
if(aconf == NULL)
{
sendto_one_notice(source_p, ":No D-Line for %s", cidr);
return 0;
}
rb_strlcpy(buf, aconf->host, sizeof buf);
if(remove_temp_dline(aconf))
{
sendto_one(source_p,
":%s NOTICE %s :Un-dlined [%s] from temporary D-lines",
me.name, source_p->name, buf);
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"%s has removed the temporary D-Line for: [%s]",
get_oper_name(source_p), buf);
ilog(L_KLINE, "UD %s %s", get_oper_name(source_p), buf);
return 0;
}
filename = get_conf_name(DLINE_TYPE);
if((in = fopen(filename, "r")) == 0)
{
sendto_one(source_p, ":%s NOTICE %s :Cannot open %s", me.name, source_p->name, filename);
return 0;
}
oldumask = umask(0);
if((out = fopen(temppath, "w")) == 0)
{
sendto_one(source_p, ":%s NOTICE %s :Cannot open %s", me.name, source_p->name, temppath);
fclose(in);
umask(oldumask);
return 0;
}
umask(oldumask);
while (fgets(buf, sizeof(buf), in))
{
rb_strlcpy(buff, buf, sizeof(buff));
if((p = strchr(buff, '\n')) != NULL)
*p = '\0';
if((*buff == '\0') || (*buff == '#'))
{
if(!error_on_write)
flush_write(source_p, out, buf, temppath);
continue;
}
if((found_cidr = getfield(buff)) == NULL)
{
if(!error_on_write)
flush_write(source_p, out, buf, temppath);
continue;
}
if(irccmp(found_cidr, aconf->host) == 0)
{
pairme++;
}
else
{
if(!error_on_write)
flush_write(source_p, out, buf, temppath);
continue;
}
}
fclose(in);
if (fclose(out))
error_on_write = YES;
if(error_on_write)
{
sendto_one(source_p,
":%s NOTICE %s :Couldn't write D-line file, aborted",
me.name, source_p->name);
return 0;
}
else if(!pairme)
{
sendto_one_notice(source_p, ":Cannot find D-Line for %s in file",
aconf->host);
if(temppath != NULL)
(void) unlink(temppath);
return 0;
}
if (rename(temppath, filename))
{
sendto_one_notice(source_p, ":Couldn't rename temp file, aborted");
return 0;
}
sendto_one(source_p, ":%s NOTICE %s :D-Line for [%s] is removed", me.name, source_p->name, aconf->host);
sendto_realops_snomask(SNO_GENERAL, L_ALL,
"%s has removed the D-Line for: [%s]", get_oper_name(source_p), aconf->host);
ilog(L_KLINE, "UD %s %s", get_oper_name(source_p), aconf->host);
delete_one_address_conf(aconf->host, aconf);
return 0;
}
/*
* valid_comment
* inputs - pointer to client
* - pointer to comment
* output - 0 if no valid comment, 1 if valid
* side effects - NONE
*/
static int
valid_comment(char *comment)
{
if(strchr(comment, '"'))
return 0;
if(strlen(comment) > BANREASONLEN)
comment[BANREASONLEN] = '\0';
return 1;
}
/*
* flush_write()
*
* inputs - pointer to client structure of oper requesting unkline
* - out is the file descriptor
* - buf is the buffer to write
* - ntowrite is the expected number of character to be written
* - temppath is the temporary file name to be written
* output - YES for error on write
* - NO for success
* side effects - if successful, the buf is written to output file
* if a write failure happesn, and the file pointed to
* by temppath, if its non NULL, is removed.
*
* The idea here is, to be as robust as possible when writing to the
* kline file.
*
* -Dianora
*/
static int
flush_write(struct Client *source_p, FILE * out, char *buf, char *temppath)
{
int error_on_write = (fputs(buf, out) < 0) ? YES : NO;
if(error_on_write)
{
sendto_one_notice(source_p, ":Unable to write to %s", temppath);
fclose(out);
if(temppath != NULL)
(void) unlink(temppath);
}
return (error_on_write);
}
/* remove_temp_dline()
*
* inputs - confitem to undline
* outputs -
* side effects - tries to undline anything that matches
*/
static int
remove_temp_dline(struct ConfItem *aconf)
{
rb_dlink_node *ptr;
int i;
for (i = 0; i < LAST_TEMP_TYPE; i++)
{
RB_DLINK_FOREACH(ptr, temp_dlines[i].head)
{
if (aconf == ptr->data)
{
rb_dlinkDestroy(ptr, &temp_dlines[i]);
delete_one_address_conf(aconf->host, aconf);
return YES;
}
}
}
return NO;
}
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