作者：李宇
流量统计
流量统计使用ntop提供的统计功能来实现。ntop在统计过程中，会在内存中创建一个数据列表，即时更新数据信息。同时，它提供定时向数据库中发送相关数据的功能，时间间隔可以在编译前设置。我们可以根据实际需要定义ntop统计的数据。利用ntop提供的向MySQL数据库中更新数据的方法，定期存储数据到备份数据库表中。定期存储数据的功能使用select _test.c实现，同时刷新内存中ntop流量值及ntop默认数据库表。
有了保存于MySQL数据库中的统计数据，通过来用PHP编写动态网页，完成数据库中数据的查询和统计。具体的实现方法比较简单。如果需要了解如何构建Apache+MySQL+PHP完成流量查询，可以在很多Linux技术交流网站查找到相关的技术文档。
由于ntop记录的信息非常详细，有些协议是很少使用的，或是产生的流量比较少，可以忽略不计，所以我们要对ntop记录的数据做一调整。
以下所做的工作有简化数据表结构（保留我们需要的字段，简化保存的数据）；创建备份数据库表test；修改ntop源代码中的sql.c，简化默认的ntop向MySQL数据库中添加的数据；编写数据库表数据的备份程序；设定ntop对数据库的刷新时间，保证刷新内存的时间小于我们设定的循环时间（参见ntop.h）；将网卡设置为非混杂模式；编写脚本完成循环统计功能。
简化后的数据表结构（mySQLdefs.txt）
CREATE TABLE IPtraffic
(
IPaddress CHAR(16) NOT NULL,
TCPsentRemotely INT,
TCPrcvdFromRemote INT,
UDPsentRemotely INT,
UDPrcvdFromRemote INT,
PRIMARY KEY (IPaddress)
);
CREATE TABLE NameMapper
(
IPaddress CHAR(16) NOT NULL,
Name CHAR(50),
PRIMARY KEY (IPaddress)
);
创建备份数据库表test
Field Type Null Key Default Extra
IPaddress varchar(20) YES NULL
data int(11) YES NULL
dates date YES NULL
修改ntop源代码中的sql.c
例如：
if(snprintf(sqlBuf, SQL_BUF_LEN, "UPDATE IPtraffic SET "
"TCPSentRemotely = %llu,"
"TCPrcvdFromRemote = %llu,"
"UDPSentRemotely = %llu,"
"UDPrcvdFromRemote = %llu"
"WHERE IPaddress = '%s'",
(el-tcpSentRemotely),
(el-tcpReceivedFromRemote),
(el-udpSentRemotely),
(el-udpReceivedFromRemote),
el-hostNumIpAddress)
sendto(sqlSocket, sqlBuf, strlen(sqlBuf), 0, (struct sockaddr *)&dest,
sizeof(dest));
将需要的字段保留，其它的去除！
编写数据库表数据的备份程序select_test.c的编译程序（编译时运行make）
Makefile ：
#This is a Makefile for select_test.c
CC = gcc
INCLUDE = -I/usr/include/mysql
LIBPATH = -L/usr/lib/mysql
LLIB = -lmysqlclient
select_test:select_test.c
$(CC) -o select_test select_test.c $(INCLUDE) $(LIBPATH) $(LLIB)
数据库表数据备份程序select_test.c:
#include
#include
#include "mysql.h"
#include
#include
#define SELECT_QUERY"select
IPaddress,(UDPrcvdFromRemote+UDPsentRemotely+TCPrcv
dFromRemote+TCPsentRemotely) as data from IPtraffic where IPaddress like
\"%s\" or IPaddress like \"%s\""
#define INSERT_QUERY "insert into test (IPaddress,data,dates) values
(\"%s\",%d,\"%s\")"
#define TEST_QUERY "select dates from test where dates=\"%s\""
/*获取当前日期*/
getdates(char *currentdate)
{
struct timeval datetemp;
struct tm * datetemp1;
gettimeofday(&datetemp,(void *)NULL);
datetemp1 = localtime(&(datetemp.tv_sec));
sprintf(currentdate,"%d-%02d-%02d",datetemp1-tm_year+1900,datetemp1-tm_mon+1,
datetemp1-tm_mday);
}
int main(int argc, char **argv)
{
unsigned int num_fields;
unsigned int i;
int count,num,charge;
MYSQL mysql,*sock;
MYSQL_RES *res;
MYSQL_FIELD **fields;
MYSQL_ROW row;
char selectqbuf[1024];
char insertqbuf[1024];
char testqbuf[512];
char currentdate[11];
currentdate[10] = 0;
if (argc != 3)
{
fprintf(stderr,"usage : select_test \n\n");＃设定需要统计的网段
exit(1);
}
mysql_init(&mysql);
if (!(sock= mysql_real_connect(&mysql,NULL,0,0,"NTOP",0,NULL,0)))
{
fprintf(stderr,"Couldn't connect to engine!\n%s\n\n",mysql_error(&mysql));
perror("");
exit(1);
}
/* IN NTOP databases,if have some recorders same as currentdate,don't in
sert them to data`table*/
getdates(currentdate);
charge=1;
sprintf(testqbuf,TEST_QUERY,currentdate);
if(mysql_query(sock,testqbuf))
{
fprintf(stderr,"Query failed (%s)\n",mysql_error(sock));
exit(1);
}
if (!(res=mysql_store_result(sock)))
{
fprintf(stderr,"Couldn't get result from %s\n",
mysql_error(sock));
exit(1);
}
i=mysql_num_rows(res);
if (i==-1)
{
printf("couldn't run test select with currentdate\n");
}
if ((i!=0)&&(i!=-1))
{
charge=0;
printf("IN test table,having
some recorders included currentdate,error!\n");
exit(1);
}
mysql_free_result(res);
mysql_close(sock);
if(!(sock= mysql_real_connect(&mysql,NULL,0,0,"NTOP",0,NULL,0)))
{
fprintf(stderr,"Couldn't connect to
engine!\n%s\n\n",mysql_error(&mysql));
perror("");
exit(1);
}
/#sleep(100)#/
sprintf(selectqbuf,SELECT_QUERY,argv[1],argv[2]);
if(mysql_query(sock,selectqbuf))
{
fprintf(stderr,"Query failed (%s)\n",mysql_error(sock));
exit(1);
}
if (!(res=mysql_store_result(sock)))
{
fprintf(stderr,"Couldn't get result from %s\n",
mysql_error(sock));
exit(1);
}
while ((row=mysql_fetch_row(res))&&charge)
{
num=atoi(row[1]);
sprintf(insertqbuf,INSERT_QUERY,row[0],num,currentdate);
mysql_query(sock,insertqbuf);