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/* Analyse traffic for logging mode */
/* - by: Brecht Claerhout */
const unsigned char *data;
memcpy(&tcphead,header,sizeof(struct TCP_header));
dummy_pointer=search_dynam(filename, TCP);
if(dummy_pointer!=NULL) status=1;
if(status==0) /* make a new entry unless it's reset */
{
if(finish!=TCP_FINISH)
if((dummy_pointer=add_dynam(filename, TCP, 0,ntohl(tcphead.seq_nr),info.DATA_len))==NULL)
return;
};
if(finish==TCP_FINISH) /* let's reset the connection */
{delete_dynam(filename, TCP, 0);}
/*** return before using any search or pointer!!!!!!!! ***/
/* Connections with FIN have deleted entries! */
dummy=ntohs(tcphead.offset_flag);
if(LOGPARAM & LOGPARAM_RAW) /* Raw logging */
{
if(dummy&SYN) print_conn(filename,"Connection initiated. (SYN)");
if(dummy&FIN) print_conn(filename,"Connection ending. (FIN)");
if(dummy&RST) print_conn(filename,"Connection reset. (RST)");
return;
};
data = sp+PROTO_HEAD+info.IP_len+info.TCP_len;
if(LOGPARAM & LOGPARAM_NORM) /* NORM logging */
{
if(search_dynam(filename2, TCP)==NULL)
{
if(dummy&SYN) print_conn(filename,"Connection initiated.");
if(dummy&FIN) print_conn(filename2,"Connection closed.");
if(dummy&RST) print_conn(filename2,"Connection closed.");
};
};
if((dummy&FIN)||(dummy&RST)) return; /* needed, cauz entry don't exist */
/*** TELNET *****************************************************************/
if(LOGPARAM & LOGPARAM_TELNET)
{
dummy_pointer=search_dynam(filename, TCP);
/* don't forget to check dummy_pointer!!! */
if( (ntohs(tcphead.source) == 23)&&(dummy_pointer!=NULL))/* from telnet */
{
sbuf_update(dummy_pointer,ntohl(tcphead.seq_nr),data,info.DATA_len);
/* detect login */
strlower(dummy_pointer->scroll_buf);
if((dummy_pointer->log!=LOG_NO_DETECT)&&
(strstr(dummy_pointer->scroll_buf,"login")!=NULL))
{
dummy_pointer->log=LOG_NO_DETECT;
dummy_pointer=search_dynam(filename2, TCP);
if(dummy_pointer!=NULL)
{
dummy_pointer->log=LOG_LOGIN;
dummy_pointer->bytes=0;
dummy_pointer->buffer=malloc(LOG_PASS_BUF);
if(dummy_pointer->buffer==NULL) exit(1);
dummy_pointer->buffer[0]=0;
}
else
{print_conn(filename2,"Password missed due to overload.");};\
#ifdef DEBUG_ONSCREEN
printf("Login detected, data initialised.\n");
#endif
}
}
if( (ntohs(tcphead.destination) == 23)&&(dummy_pointer!=NULL))/* TO telnet */
{
if(dummy_pointer->log==LOG_LOGIN) /* log login */
{
record_buf(dummy_pointer,ntohl(tcphead.seq_nr),data,info.DATA_len,0);
if(dummy_pointer->log==LOG_LOGIN_RECORDED) /* login recorded */
{
print_login(filename,dummy_pointer->buffer);
dummy_pointer->log=LOG_PWD; dummy_pointer->bytes=0;
dummy_pointer->buffer[0]=0;
}
}
else
{
if(dummy_pointer->log==LOG_PWD) /* log pwd */
{
record_buf(dummy_pointer,ntohl(tcphead.seq_nr),data,info.DATA_len,0);
if(dummy_pointer->log==LOG_PWD_RECORDED) /* passwd recorded */
{
print_pwd(filename,dummy_pointer->buffer);
dummy_pointer->log=LOG_NO_LOG; dummy_pointer->bytes=0;
dummy_pointer->buffer[0]=0;
}
}
}
}
}
/*** END TELNET - LOGIN ***************************************************/
/*** FTP *******************************************************************/
if(LOGPARAM & LOGPARAM_FTP) /* loglevel 12 */
{
dummy_pointer=search_dynam(filename, TCP);
/* don't forget to check dummy_pointer!!! */
if( (ntohs(tcphead.destination) == 21) &&
(dummy_pointer!=NULL))/* to FTP */
{
sbuf_update(dummy_pointer,ntohl(tcphead.seq_nr),data,info.DATA_len);
/* detect USER en PASS */
if((help=strstr(dummy_pointer->scroll_buf,"USER"))!=NULL)
{
help+=strlen("USER ");
for(i=0;i<SCBUF;i++)
if(dummy_pointer->scroll_buf[i]==FTP_ENTER)
dummy_pointer->scroll_buf[i]=0;
print_ftp_user(filename,help);
for(i=0;i<SCBUF;i++) dummy_pointer->scroll_buf[i]=' ';
}
if((help=strstr(dummy_pointer->scroll_buf,"PASS"))!=NULL)
{
help+=strlen("PASS ");
for(i=0;i<SCBUF;i++)
if(dummy_pointer->scroll_buf[i]==FTP_ENTER)
dummy_pointer->scroll_buf[i]=0;
print_ftp_pass(filename,help);
for(i=0;i<SCBUF;i++) dummy_pointer->scroll_buf[i]=' ';
}
}
}
/*** END FTP ***************************************************************/
/*** MAIL ******************************************************************/
if(LOGPARAM & LOGPARAM_MAIL) /* loglevel 12 */
{
/* dummy_pointer=search_dynam(filename, TCP); */
/* don't forget to check dummy_pointer!!! */
if( (ntohs(tcphead.destination) == 25) ) /* to MAIL */
{
if(info.DATA_len!=0)
{
char workbuf1[MTU];
char *wb_dummy;
char *p;
size_t len = info.DATA_len <= MTU-1 ? info.DATA_len : MTU-1;
strncpy(workbuf1,data,len);
workbuf1[len]=0;
strlower(workbuf1);
if((p=strstr(workbuf1,"mail from"))!=NULL)
{
char workbuf2[MTU];
strcpy(workbuf2, p);
if(strchr(workbuf2,13)!=NULL) /* remove trailing enter */
{wb_dummy=strchr(workbuf2,13); *wb_dummy=0;}
if(strchr(workbuf2,10)!=NULL)
{wb_dummy=strchr(workbuf2,10); *wb_dummy=0;}
print_mail(filename,workbuf2);
}
if((p=strstr(workbuf1,"rcpt to"))!=NULL)
{
char workbuf2[MTU];
strcpy(workbuf2, p);
if(strchr(workbuf2,13)!=NULL) /* remove trailing enter */
{wb_dummy=strchr(workbuf2,13); *wb_dummy=0;}
if(strchr(workbuf2,10)!=NULL)
{wb_dummy=strchr(workbuf2,10); *wb_dummy=0;}
print_mail(filename,workbuf2);
}
}
}
}
/*** END MAIL **************************************************************/
if( (dummy_pointer=search_dynam(filename, TCP)) !=NULL)
{
if(ntohl(tcphead.seq_nr)==dummy_pointer->exp_seq)
dummy_pointer->exp_seq+=info.DATA_len;
/* if we miss a packet... no probs seq nr's get updated */
/* cauz' we can't rely on ACK's from other side */
/* it's pretty good this way */
if(ntohl(tcphead.seq_nr)>dummy_pointer->exp_seq)
dummy_pointer->exp_seq=ntohl(tcphead.seq_nr)+info.DATA_len;
}
return;
return; /* DON'T FORGET THEM!!!! */
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