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/*
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* Copyright (C) 2004 CreepLord (creeplord@pvpgn.org)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#define TRANS_INTERNAL_ACCESS
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#include "common/setup_before.h"
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#include <stdio.h>
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#ifdef HAVE_STDDEF_H
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# include <stddef.h>
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#else
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# ifndef NULL
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# define NULL ((void *)0)
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# endif
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#endif
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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#else
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# ifdef HAVE_MALLOC_H
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# include <malloc.h>
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# endif
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#else
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# ifdef HAVE_STRINGS_H
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# include <strings.h>
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# endif
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#endif
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#include "compat/strrchr.h"
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#include <errno.h>
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#include "compat/strerror.h"
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#include "common/eventlog.h"
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#include "common/list.h"
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#include "common/addr.h"
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#include "common/util.h"
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#include "common/xalloc.h"
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#include "trans.h"
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#include "common/setup_after.h"
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#define DEBUG_TRANS
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static t_list * trans_head=NULL;
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extern int trans_load(char const * filename, int program)
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{
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FILE *fp;
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unsigned int line;
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unsigned int pos;
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char *buff;
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char *temp;
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char const *input;
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char const *output;
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char const *exclude;
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char const *include;
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unsigned int npos;
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char *network;
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char *tmp;
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char tmp1[32];
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char tmp2[32];
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char tmp3[32];
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t_trans *entry;
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if (!filename) {
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eventlog(eventlog_level_error,__FUNCTION__,"got NULL filename");
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return -1;
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}
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if (!(fp = fopen(filename,"r"))) {
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eventlog(eventlog_level_error,__FUNCTION__,"could not open file \"%s\" for reading (fopen: %s)",filename,pstrerror(errno));
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return -1;
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}
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trans_head = list_create();
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for (line=1; (buff = file_get_line(fp)); line++) {
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for (pos=0; buff[pos]=='\t' || buff[pos]==' '; pos++);
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if (buff[pos]=='\0' || buff[pos]=='#') {
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continue;
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}
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if ((temp = strrchr(buff,'#'))) {
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unsigned int len;
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unsigned int endpos;
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*temp = '\0';
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len = strlen(buff)+1;
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for (endpos=len-1; buff[endpos]=='\t' || buff[endpos]==' '; endpos--);
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buff[endpos+1] = '\0';
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}
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if (!(input = strtok(buff," \t"))) { /* strtok modifies the string it is passed */
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eventlog(eventlog_level_error,__FUNCTION__,"missing input line %u of file \"%s\"",line,filename);
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continue;
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}
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/* check for port number - this tells us what programs will use this entry */
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if (!(temp = strrchr(input,':'))) {
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eventlog(eventlog_level_error,__FUNCTION__,"missing port # on input line %u of file \"%s\"",line,filename);
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continue;
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}
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temp++;
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/* bnetd doesn't want the port 4000 entries */
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if (program==TRANS_BNETD && strcmp(temp,"4000")==0) {
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#ifdef DEBUG_TRANS
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eventlog(eventlog_level_debug,__FUNCTION__,"d2gs input (ignoring) \"%s\"",input);
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#endif
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continue;
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}
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/* d2cs only wants the port 4000 entries */
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if (program==TRANS_D2CS && strcmp(temp,"4000")!=0) {
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#ifdef DEBUG_TRANS
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eventlog(eventlog_level_debug,__FUNCTION__,"non d2gs input (ignoring) \"%s\"",input);
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#endif
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continue;
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}
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if (!(output = strtok(NULL," \t"))) {
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eventlog(eventlog_level_error,__FUNCTION__,"missing output on line %u of file \"%s\"",line,filename);
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continue;
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}
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if (!(exclude = strtok(NULL," \t"))) {
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eventlog(eventlog_level_error,__FUNCTION__,"missing exclude on line %u of file \"%s\"",line,filename);
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continue;
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}
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if (!(include = strtok(NULL," \t"))) {
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eventlog(eventlog_level_error,__FUNCTION__,"missing include on line %u of file \"%s\"",line,filename);
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continue;
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}
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/* add exlude networks */
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tmp = xstrdup(exclude);
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npos=0;
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while (tmp[npos]) {
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network = &tmp[npos];
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for (; tmp[npos]!=',' && tmp[npos]!='\0'; npos++);
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if (tmp[npos]=='\0')
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npos--;
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else
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tmp[npos]='\0';
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if (strcmp(network,"NONE")==0) {
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npos++;
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continue;
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}
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entry = xmalloc(sizeof(t_trans));
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if (!(entry->input = addr_create_str(input,0,0))) {
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eventlog(eventlog_level_error,__FUNCTION__,"could not allocate memory for input address");
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xfree(entry);
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npos++;
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continue;
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}
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if (!(entry->output = addr_create_str(input,0,0))) {
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eventlog(eventlog_level_error,__FUNCTION__,"could not allocate memory for output address");
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addr_destroy(entry->input);
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xfree(entry);
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npos++;
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continue;
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}
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if (strcmp(network,"ANY")==0) {
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if (!(entry->network = netaddr_create_str("0.0.0.0/0"))) {
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eventlog(eventlog_level_error,__FUNCTION__,"could not allocate memory for network address");
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addr_destroy(entry->output);
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addr_destroy(entry->input);
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xfree(entry);
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npos++;
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continue;
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}
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} else {
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if (!(entry->network = netaddr_create_str(network))) {
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eventlog(eventlog_level_error,__FUNCTION__,"could not allocate memory for network address");
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addr_destroy(entry->output);
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addr_destroy(entry->input);
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xfree(entry);
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npos++;
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continue;
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}
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}
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#ifdef DEBUG_TRANS
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eventlog(eventlog_level_debug,__FUNCTION__,
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"Adding Host -> %s, Output -> %s, Network %s - (exclude)",
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addr_get_addr_str(entry->input,tmp1,sizeof(tmp1)),
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addr_get_addr_str(entry->output,tmp2,sizeof(tmp2)),
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netaddr_get_addr_str(entry->network,tmp3,sizeof(tmp3)));
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#endif
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list_append_data(trans_head,entry);
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npos++;
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}
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xfree(tmp);
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/* add include networks */
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tmp = xstrdup(include);
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npos=0;
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while (tmp[npos]) {
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network = &tmp[npos];
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for (; tmp[npos]!=',' && tmp[npos]!='\0'; npos++);
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if (tmp[npos]=='\0')
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npos--;
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else
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tmp[npos]='\0';
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if (strcmp(network,"NONE")==0) {
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npos++;
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continue;
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}
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entry = xmalloc(sizeof(t_trans));
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if (!(entry->input = addr_create_str(input,0,0))) {
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eventlog(eventlog_level_error,__FUNCTION__,"could not allocate memory for input address");
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xfree(entry);
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npos++;
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continue;
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}
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if (!(entry->output = addr_create_str(output,0,0))) {
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eventlog(eventlog_level_error,__FUNCTION__,"could not allocate memory for output address");
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addr_destroy(entry->input);
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xfree(entry);
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npos++;
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continue;
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}
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if (strcmp(network,"ANY")==0) {
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if (!(entry->network = netaddr_create_str("0.0.0.0/0"))) {
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eventlog(eventlog_level_error,__FUNCTION__,"could not allocate memory for network address");
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addr_destroy(entry->output);
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addr_destroy(entry->input);
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xfree(entry);
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npos++;
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continue;
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}
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} else {
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if (!(entry->network = netaddr_create_str(network))) {
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eventlog(eventlog_level_error,__FUNCTION__,"could not allocate memory for network address");
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addr_destroy(entry->output);
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addr_destroy(entry->input);
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xfree(entry);
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npos++;
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continue;
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}
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}
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#ifdef DEBUG_TRANS
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eventlog(eventlog_level_debug,__FUNCTION__,
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"Adding Host -> %s, Output -> %s, Network %s - (include)",
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addr_get_addr_str(entry->input,tmp1,sizeof(tmp1)),
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addr_get_addr_str(entry->output,tmp2,sizeof(tmp2)),
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netaddr_get_addr_str(entry->network,tmp3,sizeof(tmp3)));
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#endif
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list_append_data(trans_head,entry);
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npos++;
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}
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xfree(tmp);
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}
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file_get_line(NULL); // clear file_get_line buffer
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fclose(fp);
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eventlog(eventlog_level_info,__FUNCTION__,"trans file loaded");
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return 0;
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}
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extern int trans_unload(void)
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{
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t_elem *curr;
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t_trans *entry;
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if (trans_head) {
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LIST_TRAVERSE(trans_head,curr)
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{
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if (!(entry = elem_get_data(curr))) {
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eventlog(eventlog_level_error,__FUNCTION__,"found NULL entry in list");
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} else {
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netaddr_destroy(entry->network);
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addr_destroy(entry->output);
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addr_destroy(entry->input);
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xfree(entry);
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}
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list_remove_elem(trans_head,&curr);
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}
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list_destroy(trans_head);
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trans_head = NULL;
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}
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return 0;
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}
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extern int trans_reload(char const * filename, int program)
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{
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trans_unload();
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if(trans_load(filename,program)<0) return -1;
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return 0;
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}
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extern int trans_net(unsigned int clientaddr, unsigned int *addr, unsigned short *port)
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{
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t_elem const *curr;
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t_trans *entry;
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char temp1[32];
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char temp2[32];
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char temp3[32];
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char temp4[32];
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#ifdef DEBUG_TRANS
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eventlog(eventlog_level_debug,__FUNCTION__,"checking %s for client %s ...",
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addr_num_to_addr_str(*addr, *port),
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addr_num_to_ip_str(clientaddr));
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#endif
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if (trans_head) {
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LIST_TRAVERSE_CONST(trans_head,curr)
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{
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if (!(entry = elem_get_data(curr))) {
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eventlog(eventlog_level_error,__FUNCTION__,"found NULL entry in list");
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continue;
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}
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#ifdef DEBUG_TRANS
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eventlog(eventlog_level_debug,__FUNCTION__,"against entry -> %s output %s network %s",
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addr_get_addr_str(entry->input,temp1,sizeof(temp1)),
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addr_get_addr_str(entry->output,temp2,sizeof(temp2)),
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netaddr_get_addr_str(entry->network,temp3,sizeof(temp3)));
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#endif
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if (addr_get_ip(entry->input)!=*addr || addr_get_port(entry->input)!=*port) {
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#ifdef DEBUG_TRANS
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eventlog(eventlog_level_debug,__FUNCTION__,"entry does match input address");
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#endif
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continue;
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}
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if (netaddr_contains_addr_num(entry->network,clientaddr)==0) {
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#ifdef DEBUG_TRANS
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eventlog(eventlog_level_debug,__FUNCTION__,"client is not in the correct network");
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#endif
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continue;
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}
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#ifdef DEBUG_TRANS
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eventlog(eventlog_level_debug,__FUNCTION__,"%s translated to %s",
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addr_num_to_addr_str(*addr, *port),
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addr_get_addr_str(entry->output,temp4,sizeof(temp4)));
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#endif
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*addr = addr_get_ip(entry->output);
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*port = addr_get_port(entry->output);
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return 1; /* match found in list */
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}
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}
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#ifdef DEBUG_TRANS
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eventlog(eventlog_level_debug,__FUNCTION__,"no match found for %s (not translated)",
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addr_num_to_addr_str(*addr, *port));
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#endif
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return 0; /* no match found in list */
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}
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