怎么在NS2中添加一个协议

以你之姓@ 2022-07-16 01:07 194阅读 0赞

很简答的一个历程，就是说明下，在C++层面添加一个组件，需要做哪些工作，设计到哪些系统文件，请高手飞过。

一、到ns-allinone-2.35\\ns-2.35\\queue目录

复制drop-tail.cc和drop-tail.h（本目录），并重名为：myfifo.cc和myfifo.h

1、修改myfifo.h

替换掉drop\_tail为myfifo

替换掉DropTail为Myfifo

\#ifndef ns\_myfifo\_h  
\#define ns\_myfifo\_h  
  
  
\#include <string.h>  
\#include "queue.h"  
\#include "config.h"  
  
  
/\*  
\* A bounded, myfifo queue  
\*/  
class Myfifo : public Queue \{  
public:  
Myfifo() \{  
q\_ = new PacketQueue;  
pq\_ = q\_;  
bind\_bool("drop\_front\_", &drop\_front\_);  
bind\_bool("summarystats\_", &summarystats);  
bind\_bool("queue\_in\_bytes\_", &qib\_); // boolean: q in bytes?  
bind("mean\_pktsize\_", &mean\_pktsize\_);  
//\_RENAMED("drop-front\_", "drop\_front\_");  
\}  
~Myfifo() \{  
delete q\_;  
\}  
protected:  
void reset();  
int command(int argc, const char\*const\* argv);  
void enque(Packet\*);  
Packet\* deque();  
void shrink\_queue();// To shrink queue and drop excessive packets.  
  
  
PacketQueue \*q\_;/\* underlying FIFO queue \*/  
int drop\_front\_;/\* drop-from-front (rather than from tail) \*/  
int summarystats;  
void print\_summarystats();  
int qib\_; /\* bool: queue measured in bytes? \*/  
int mean\_pktsize\_;/\* configured mean packet size in bytes \*/  
\};  
  
  
\#endif

2、修改myfifo.cc

替换

替换掉drop\_tail为myfifo

替换掉DropTail为Myfifo

\#include "myfifo.h"  
  
  
static class MyfifoClass : public TclClass \{  
public:  
MyfifoClass() : TclClass("Queue/Myfifo") \{\}  
TclObject\* create(int, const char\*const\*) \{  
return (new Myfifo);  
\}  
\} class\_drop\_tail;//我这里没有改也能用  
  
  
void Myfifo::reset()  
\{  
Queue::reset();  
\}  
  
  
int  
Myfifo::command(int argc, const char\*const\* argv)  
\{  
if (argc==2) \{  
if (strcmp(argv\[1\], "printstats") == 0) \{  
print\_summarystats();  
return (TCL\_OK);  
\}  
if (strcmp(argv\[1\], "shrink-queue") == 0) \{  
shrink\_queue();  
return (TCL\_OK);  
\}  
\}  
if (argc == 3) \{  
if (!strcmp(argv\[1\], "packetqueue-attach")) \{  
delete q\_;  
if (!(q\_ = (PacketQueue\*) TclObject::lookup(argv\[2\])))  
return (TCL\_ERROR);  
else \{  
pq\_ = q\_;  
return (TCL\_OK);  
\}  
\}  
\}  
return Queue::command(argc, argv);  
\}  
  
  
/\*  
\* myfifo  
\*/  
void Myfifo::enque(Packet\* p)  
\{  
if (summarystats) \{  
Queue::updateStats(qib\_?q\_->byteLength():q\_->length());  
\}  
  
  
int qlimBytes = qlim\_ \* mean\_pktsize\_;  
if ((!qib\_ && (q\_->length() + 1) >= qlim\_) ||  
(qib\_ && (q\_->byteLength() + hdr\_cmn::access(p)->size()) >= qlimBytes))\{  
// if the queue would overflow if we added this packet...  
if (drop\_front\_) \{ /\* remove from head of queue \*/  
q\_->enque(p);  
Packet \*pp = q\_->deque();  
drop(pp);  
\} else \{  
drop(p);  
\}  
\} else \{  
q\_->enque(p);  
\}  
\}  
  
  
//AG if queue size changes, we drop excessive packets...  
void Myfifo::shrink\_queue()  
\{  
int qlimBytes = qlim\_ \* mean\_pktsize\_;  
if (debug\_)  
printf("shrink-queue: time %5.2f qlen %d, qlim %d\\n",  
Scheduler::instance().clock(),  
q\_->length(), qlim\_);  
while ((!qib\_ && q\_->length() > qlim\_) ||  
(qib\_ && q\_->byteLength() > qlimBytes)) \{  
if (drop\_front\_) \{ /\* remove from head of queue \*/  
Packet \*pp = q\_->deque();  
drop(pp);  
\} else \{  
Packet \*pp = q\_->tail();  
q\_->remove(pp);  
drop(pp);  
\}  
\}  
\}  
  
  
Packet\* Myfifo::deque()  
\{  
if (summarystats && &Scheduler::instance() != NULL) \{  
Queue::updateStats(qib\_?q\_->byteLength():q\_->length());  
\}  
return q\_->deque();  
\}  
  
  
void Myfifo::print\_summarystats()  
\{  
//double now = Scheduler::instance().clock();  
printf("True average queue: %5.3f", true\_ave\_);  
if (qib\_)  
printf(" (in bytes)");  
printf(" time: %5.3f\\n", total\_time\_);  
\}

二、修改makefile

这里设计到三个文件 ns-allinone-2.35/ns-2.35

makefile makefile.in makefile.vc

我全部改掉到了，不知道makefile.vc作用；makefile.in在做 ./configure时候会把内容复制到makefile 。

三、修改ns-default.tcl

目录在ns-allinone-2.35\\ns-2.35\\tcl\\lib

找到：DropTail

把参数复制一遍，并修改

Queue/DropTail set drop\_front\_ false  
Queue/DropTail set summarystats\_ false  
Queue/DropTail set queue\_in\_bytes\_ false  
Queue/DropTail set mean\_pktsize\_ 500  
  
  
  
  
Queue/Myfifo set drop\_front\_ false  
Queue/Myfifo set summarystats\_ false  
Queue/Myfifo set queue\_in\_bytes\_ false  
Queue/Myfifo set mean\_pktsize\_ 500

四、CD到ns-allinone-2.35/ns-2.35

然后make，如果提示错误：

$ make ![Image 1][]myfifo.cc  
![Image 1][]Makefile.in is newer than Makefile.  
You need to re-run configure.  
false  
Makefile:439: recipe for target 'Makefile' failed  
make: \*\*\* \[Makefile\] Error 1

先输入 ./configure

在make clean

在make

注：makes不能指定文件名，新手见笑了

至于在用C++去写一个新的组件，后期再更新

总结：如果把新增模组添加到ns2核心步骤：

1、准备好组件（XX.CC和XX.H）；

2、如果需要做初始化设定的话，修改ns-default.tcl；

3、修改makefile(把XX.O加到OBJ\_CC内)；

4、重新编译；

5、测试组件；

[Image 1]: