ns2.35中嵌入自写协议的方法
本文介绍如何在最新版的NS2.35中嵌入一个自己写的简单新协议，读者可先不必较真协议的具体实现代码，先熟悉嵌入流程因为此代码还是有一定bug的，但实现一个协议的总体框架是对的。后续文章将对如何写一个新协议进行解析，如TCL如何传值到C++等。
一、编写新协议simple_trans
我们在 NS_HOME 根目录下创建一个文件夹 kgn，目录下有两个文件： simple_trans.h和simple_trans.cc，这两个文件就是我们新协议的主体实现文件。
simple_trans.h代码内容
#ifndef ns_simple_trans_h
#define ns_simple_trans_h
#include "agent.h"
#include "tclcl.h"
#include "packet.h"
#include "address.h"
#include "ip.h"
//协议默认传输的端口
#define PROTOCOL_DEFAULT_PORT 1023
//同步指令（类似于 TCP 协议中三次握手的第一步，事实上我们的这个协议最终就是要实现一个简化版的三步握手）
#define PROTOCOL_INIT_SYN 1
//只有 type 这个是我定义的，其他的内容是 ns2 系统需要的
struct hdr_simple_trans {
int type;
static int offset_;
inline static int& offset() {
return offset_;
}
inline static hdr_simple_trans * access(const Packet * p) {
return (hdr_simple_trans*) p->access(offset_);
}
};
//产生数据包、发送数据包、接收数据包的地方，包括的 target 变量就是数据包发送给的下一个目标。
class simple_trans_agent : public Agent {
public :
simple_trans_agent();
virtual void recv(Packet *, Handler *);//“自动”的收到网络上传输的数据包（更深层次的是经过了地址和端口过滤器）
void send_simple_msg(int type, int target);//创建并发送数据
int get_target(){ return simple_target; }//接口保护
protected:
int simple_target;
int simple_port;
int command(int argc, const char*const*argv);
};
//一个定时器（闹钟）在到时时候会调用一个 expire （超时）函数
class SYNTimer : public TimerHandler {
public:
SYNTimer(simple_trans_agent* t) : TimerHandler(), t_(t) {
}
inline virtual void expire(Event *);
protected:
simple_trans_agent* t_;
};
#endif
simple_trans.cc代码内容
#include "simple_trans.h"
//显示系统时间
#define NOW Scheduler::instance().clock()
//得到当前节点的地址
#define MYNODE Address::instance().get_nodeaddr(addr())
int hdr_simple_trans::offset_;
static class simple_transHeaderClass : public PacketHeaderClass {
public:
simple_transHeaderClass() : PacketHeaderClass("PacketHeader/simple_trans",sizeof(hdr_simple_trans)) {
bind_offset(&hdr_simple_trans::offset_);
}
} class_simple_transhdr;
static class simple_transClass : public TclClass {
public:
simple_transClass() : TclClass("Agent/simple_trans") {}
TclObject* create(int, const char*const*) {
return (new simple_trans_agent());
}
} class_simple_trans;
simple_trans_agent::simple_trans_agent() : Agent(PT_SIMPLE_TRANS_PACKET),
simple_target(-1), simple_port(PROTOCOL_DEFAULT_PORT) {
bind("simple_target_", &simple_target);
bind("simple_port_", &simple_port);
}
//到时了就发送我们的 SYN 信息给我们的目标节点
void SYNTimer::expire(Event *){
t_->send_simple_msg(PROTOCOL_INIT_SYN, t_->get_target());
this->resched(1.00);
}
void simple_trans_agent::send_simple_msg(int type, int target) {
//数据包的生成
Packet* pkt = allocpkt();
//数据包的访问
hdr_ip *iph = hdr_ip::access(pkt);
hdr_simple_trans *shdr = hdr_simple_trans::access(pkt);
if( type == PROTOCOL_INIT_SYN) {
if( simple_target != -1 ) {
iph->daddr() = simple_target;
} else {
printf(" no target specificed \n ");
return ;
}
iph->dport() = simple_port;
iph->saddr() = MYNODE;
shdr->type = PROTOCOL_INIT_SYN;
send( pkt, 0 );
}
}
int simple_trans_agent::command(int argc, const char*const* argv) {
if( argc == 2 ) {
if( !strcmp( argv[1], "begin" ) ) {
//sendsend_simple_msg( PROTOCOL_INIT_SYN, simple_target );
SYNTimer *syn_timer = new SYNTimer(this);
syn_timer->resched(1.00);
return (TCL_OK);
}
}
if( argc == 3 ) {
if( !strcmp( argv[1], "set-target" ) ) {
simple_target = atoi( argv[2] );
printf("=>set-target = %d \n ", simple_target);
return (TCL_OK);
}
}
return (Agent::command(argc, argv));
}
void simple_trans_agent::recv(Packet *p, Handler *) {
hdr_ip *iph = hdr_ip::access(p);
hdr_simple_trans *shdr = hdr_simple_trans::access(p);
if( shdr->type == PROTOCOL_INIT_SYN ) {
printf("=>At %lf node %d receive PROTOCOL_INIT_SYN signaling from node %d \n",
NOW, MYNODE, iph->saddr());
} else {
printf(" wrong type siganling \n");
}
}
二、对packet.h进行修改
在 NS_HOME/common/packet.h 加入static const packet_t PT_SIMPLE_TRANS_PACKET = 74;
在 class p_info 中加入name_[PT_SIMPLE_TRANS_PACKET] = "simple_trans_packet" （非必须的）。
packet.h关键代码内容：
//add by song static const packet_t PT_SIMPLE_TRANS_PACKET = 73; // insert new packet types here static packet_t PT_NTYPE = 74; // This MUST be the LAST one
name_[PT_NTYPE]= "undefined"; // add by song name_[PT_SIMPLE_TRANS_PACKET] = "SIMPLE_trans_packet";
三、对ns2.35进行重新编译
最后一步，就是编译我们整个协议将其键入到 ns 中了，编译前我们要修改 makefile 文件，由于我们是在 NS_HOME/kgn 目录中所以， makefile 需要修改的有两个地方：
在 INCLUDES = 中加入 -I./kgn ，加入这个的好处就是我们在其他目录使用 simple_trans.h 的时候不用将 kgn 次级目录包含进去；
在 OBJ_CC = 中加入 kgn/simple_trans.o \ 。
makefile关键代码内容：
INCLUDES = \ -I. \ -I. \ -I/home/song/ns-allinone-2.35/tclcl-1.20 -I/home/song/ns-allinone-2.35/otcl-1.14 -I/home/song/ns-allinone-2.35/include -I/home/song/ns-allinone-2.35/include -I/home/song/ns-allinone-2.35/include -I/usr/include/pcap \ -I./tcp -I./sctp -I./common -I./link -I./queue \ -I./adc -I./apps -I./mac -I./mobile -I./trace \ -I./routing -I./tools -I./classifier -I./mcast \ -I./diffusion3/lib/main -I./diffusion3/lib \ -I./diffusion3/lib/nr -I./diffusion3/ns \ -I./diffusion3/filter_core -I./asim/ -I./qs \ -I./diffserv -I./satellite \ -I./wpan\ -I./kgn
OBJ_CC = \
tools/random.o tools/rng.o tools/ranvar.o common/misc.o common/timer-handler.o \
common/scheduler.o common/object.o common/packet.o \
common/ip.o routing/route.o common/connector.o common/ttl.o \
trace/trace.o trace/trace-ip.o \
classifier/classifier.o classifier/classifier-addr.o \
classifier/classifier-hash.o \
classifier/classifier-virtual.o \
classifier/classifier-mcast.o \
classifier/classifier-bst.o \
classifier/classifier-mpath.o mcast/replicator.o \
classifier/classifier-mac.o \
classifier/classifier-qs.o \
classifier/classifier-port.o src_rtg/classifier-sr.o \
src_rtg/sragent.o src_rtg/hdr_src.o adc/ump.o \
qs/qsagent.o qs/hdr_qs.o \
apps/app.o apps/telnet.o tcp/tcplib-telnet.o \
tools/trafgen.o trace/traffictrace.o tools/pareto.o \
tools/expoo.o tools/cbr_traffic.o \
adc/tbf.o adc/resv.o adc/sa.o tcp/saack.o \
tools/measuremod.o adc/estimator.o adc/adc.o adc/ms-adc.o \
adc/timewindow-est.o adc/acto-adc.o \
adc/pointsample-est.o adc/salink.o adc/actp-adc.o \
adc/hb-adc.o adc/expavg-est.o\
adc/param-adc.o adc/null-estimator.o \
adc/adaptive-receiver.o apps/vatrcvr.o adc/consrcvr.o \
common/agent.o common/message.o apps/udp.o \
common/session-rtp.o apps/rtp.o tcp/rtcp.o \
common/ivs.o \
common/messpass.o common/tp.o common/tpm.o apps/worm.o \
tcp/tcp.o tcp/tcp-sink.o tcp/tcp-reno.o \
tcp/tcp-newreno.o \
tcp/tcp-vegas.o tcp/tcp-rbp.o tcp/tcp-full.o tcp/rq.o \
baytcp/tcp-full-bay.o baytcp/ftpc.o baytcp/ftps.o \
tcp/scoreboard.o tcp/scoreboard-rq.o tcp/tcp-sack1.o tcp/tcp-fack.o \
tcp/scoreboard1.o tcp/tcp-linux.o tcp/linux/ns-linux-util.o \
tcp/tcp-asym.o tcp/tcp-asym-sink.o tcp/tcp-fs.o \
tcp/tcp-asym-fs.o \
tcp/tcp-int.o tcp/chost.o tcp/tcp-session.o \
tcp/nilist.o \
sctp/sctp.o apps/sctp_app1.o\
sctp/sctp-timestamp.o sctp/sctp-hbAfterRto.o \
sctp/sctp-multipleFastRtx.o sctp/sctp-mfrHbAfterRto.o \
sctp/sctp-mfrTimestamp.o \
sctp/sctp-cmt.o \
sctp/sctpDebug.o \
dccp/dccp_sb.o \
dccp/dccp_opt.o \
dccp/dccp_ackv.o \
dccp/dccp_packets.o \
dccp/dccp.o \
dccp/dccp_tcplike.o \
dccp/dccp_tfrc.o \
tools/integrator.o tools/queue-monitor.o \
tools/flowmon.o tools/loss-monitor.o \
queue/queue.o queue/drop-tail.o \
adc/simple-intserv-sched.o queue/red.o \
queue/semantic-packetqueue.o queue/semantic-red.o \
tcp/ack-recons.o \
queue/sfq.o queue/fq.o queue/drr.o queue/srr.o queue/cbq.o \
queue/jobs.o queue/marker.o queue/demarker.o \
link/hackloss.o queue/errmodel.o queue/fec.o\
link/delay.o tcp/snoop.o \
gaf/gaf.o \
link/dynalink.o routing/rtProtoDV.o common/net-interface.o \
mcast/ctrMcast.o mcast/mcast_ctrl.o mcast/srm.o \
common/sessionhelper.o queue/delaymodel.o \
mcast/srm-ssm.o mcast/srm-topo.o \
routing/alloc-address.o routing/address.o \
$(LIB_DIR)int.Vec.o $(LIB_DIR)int.RVec.o \
$(LIB_DIR)dmalloc_support.o \
webcache/http.o webcache/tcp-simple.o webcache/pagepool.o \
webcache/inval-agent.o webcache/tcpapp.o webcache/http-aux.o \
webcache/mcache.o webcache/webtraf.o \
webcache/webserver.o \
webcache/logweb.o \
empweb/empweb.o \
empweb/empftp.o \
realaudio/realaudio.o \
mac/lanRouter.o classifier/filter.o \
common/pkt-counter.o \
common/Decapsulator.o common/Encapsulator.o \
common/encap.o \
mac/channel.o mac/mac.o mac/ll.o mac/mac-802_11.o \
mac/mac-802_11Ext.o \
mac/mac-802_3.o mac/mac-tdma.o mac/smac.o \
mobile/mip.o mobile/mip-reg.o mobile/gridkeeper.o \
mobile/propagation.o mobile/tworayground.o \
mobile/nakagami.o \
mobile/antenna.o mobile/omni-antenna.o \
mobile/shadowing.o mobile/shadowing-vis.o mobile/dumb-agent.o \
common/bi-connector.o common/node.o \
common/mobilenode.o \
mac/arp.o mobile/god.o mobile/dem.o \
mobile/topography.o mobile/modulation.o \
queue/priqueue.o queue/dsr-priqueue.o \
mac/phy.o mac/wired-phy.o mac/wireless-phy.o \
mac/wireless-phyExt.o \
mac/mac-timers.o trace/cmu-trace.o mac/varp.o \
mac/mac-simple.o \
satellite/sat-hdlc.o \
dsdv/dsdv.o dsdv/rtable.o queue/rtqueue.o \
routing/rttable.o \
imep/imep.o imep/dest_queue.o imep/imep_api.o \
imep/imep_rt.o imep/rxmit_queue.o imep/imep_timers.o \
imep/imep_util.o imep/imep_io.o \
tora/tora.o tora/tora_api.o tora/tora_dest.o \
tora/tora_io.o tora/tora_logs.o tora/tora_neighbor.o \
dsr/dsragent.o dsr/hdr_sr.o dsr/mobicache.o dsr/path.o \
dsr/requesttable.o dsr/routecache.o dsr/add_sr.o \
dsr/dsr_proto.o dsr/flowstruct.o dsr/linkcache.o \
dsr/simplecache.o dsr/sr_forwarder.o \
aodv/aodv_logs.o aodv/aodv.o \
aodv/aodv_rtable.o aodv/aodv_rqueue.o \
aomdv/aomdv_logs.o aomdv/aomdv.o \
aomdv/aomdv_rtable.o aomdv/aomdv_rqueue.o \
puma/puma.o \
mdart/mdart_adp.o mdart/mdart_dht.o mdart/mdart_ndp.o \
mdart/mdart_neighbor.o mdart/mdart_queue.o mdart/mdart_table.o \
mdart/mdart.o \
common/ns-process.o \
satellite/satgeometry.o satellite/sathandoff.o \
satellite/satlink.o satellite/satnode.o \
satellite/satposition.o satellite/satroute.o \
satellite/sattrace.o \
rap/raplist.o rap/rap.o rap/media-app.o rap/utilities.o \
common/fsm.o tcp/tcp-abs.o \
diffusion/diffusion.o diffusion/diff_rate.o diffusion/diff_prob.o \
diffusion/diff_sink.o diffusion/flooding.o diffusion/omni_mcast.o \
diffusion/hash_table.o diffusion/routing_table.o diffusion/iflist.o \
tcp/tfrc.o tcp/tfrc-sink.o mobile/energy-model.o apps/ping.o tcp/tcp-rfc793edu.o \
queue/rio.o queue/semantic-rio.o tcp/tcp-sack-rh.o tcp/scoreboard-rh.o \
plm/loss-monitor-plm.o plm/cbr-traffic-PP.o \
linkstate/hdr-ls.o \
mpls/classifier-addr-mpls.o mpls/ldp.o mpls/mpls-module.o \
routing/rtmodule.o classifier/classifier-hier.o \
routing/addr-params.o \
nix/hdr_nv.o nix/classifier-nix.o \
nix/nixnode.o \
routealgo/rnode.o \
routealgo/bfs.o \
routealgo/rbitmap.o \
routealgo/rlookup.o \
routealgo/routealgo.o \
nix/nixvec.o \
nix/nixroute.o \
diffserv/dsred.o diffserv/dsredq.o \
diffserv/dsEdge.o diffserv/dsCore.o \
diffserv/dsPolicy.o diffserv/ew.o diffserv/dewp.o \
queue/red-pd.o queue/pi.o queue/vq.o queue/rem.o \
queue/gk.o \
pushback/rate-limit.o pushback/rate-limit-strategy.o \
pushback/ident-tree.o pushback/agg-spec.o \
pushback/logging-data-struct.o \
pushback/rate-estimator.o \
pushback/pushback-queue.o pushback/pushback.o \
common/parentnode.o trace/basetrace.o \
common/simulator.o asim/asim.o \
common/scheduler-map.o common/splay-scheduler.o \
linkstate/ls.o linkstate/rtProtoLS.o \
pgm/classifier-pgm.o pgm/pgm-agent.o pgm/pgm-sender.o \
pgm/pgm-receiver.o mcast/rcvbuf.o \
mcast/classifier-lms.o mcast/lms-agent.o mcast/lms-receiver.o \
mcast/lms-sender.o \
queue/delayer.o \
xcp/xcpq.o xcp/xcp.o xcp/xcp-end-sys.o \
wpan/p802_15_4csmaca.o wpan/p802_15_4fail.o \
wpan/p802_15_4hlist.o wpan/p802_15_4mac.o \
wpan/p802_15_4nam.o wpan/p802_15_4phy.o \
wpan/p802_15_4sscs.o wpan/p802_15_4timer.o \
wpan/p802_15_4trace.o wpan/p802_15_4transac.o \
apps/pbc.o \
kgn/simple_trans.o \
$(OBJ_STL)
如何重新编译请查看本系列中的另一篇文章NS2源码重新编译步骤。编译完成重新安装后，可以进行测试。
四、编写TCL进行测试：
# This script is created by NSG2 beta1
# <http://wushoupong.googlepages.com/nsg>
#===================================
# Simulation parameters setup
#===================================
Antenna/OmniAntenna set Gt_ 1 ;#Transmit antenna gain
Antenna/OmniAntenna set Gr_ 1 ;#Receive antenna gain
set val(chan) Channel/WirelessChannel ;# channel type
set val(prop) Propagation/TwoRayGround ;# radio-propagation model
set val(netif) Phy/WirelessPhy ;# network interface type
set val(mac) Mac/802_11 ;# MAC type
set val(ifq) Queue/DropTail/PriQueue ;# interface queue type
set val(ll) LL ;# link layer type
set val(ant) Antenna/OmniAntenna ;# antenna model
set val(ifqlen) 50 ;# max packet in ifq
set val(nn) 2 ;# number of mobilenodes
set val(rp) DSDV ;# routing protocol
set val(x) 499 ;# X dimension of topography
set val(y) 401 ;# Y dimension of topography
set val(stop) 10.0 ;# time of simulation end
#===================================
# Initialization
#===================================
#Create a ns simulator
set ns [new Simulator]
#Setup topography object
set topo [new Topography]
$topo load_flatgrid $val(x) $val(y)
create-god $val(nn)
#Open the NS trace file
set tracefile [open out.tr w]
$ns trace-all $tracefile
#Open the NAM trace file
set namfile [open out.nam w]
$ns namtrace-all $namfile
$ns namtrace-all-wireless $namfile $val(x) $val(y)
set chan [new $val(chan)];#Create wireless channel
#===================================
# Mobile node parameter setup
#===================================
$ns node-config -adhocRouting $val(rp) \
-llType $val(ll) \
-macType $val(mac) \
-ifqType $val(ifq) \
-ifqLen $val(ifqlen) \
-antType $val(ant) \
-propType $val(prop) \
-phyType $val(netif) \
-channel $chan \
-topoInstance $topo \
-agentTrace ON \
-routerTrace ON \
-macTrace ON \
-movementTrace ON
#===================================
# Nodes Definition
#===================================
#Create 2 nodes
set n0 [$ns node]
$n0 set X_ 300
$n0 set Y_ 300
$n0 set Z_ 0.0
$ns initial_node_pos $n0 20
set n1 [$ns node]
$n1 set X_ 545
$n1 set Y_ 300
$n1 set Z_ 0.0
$ns initial_node_pos $n1 20
#===================================
# Agents Definition
#===================================
set sT1 [new Agent/simple_trans]
#$sT1 set-target [AddrParams addr2id [$n1 node-addr]]
$sT1 set simple_target_ [AddrParams addr2id [$n1 node-addr]]
$n0 attach $sT1 1023
set sT2 [new Agent/simple_trans]
$n1 attach $sT2 1023
$sT2 set interval_ 0.1
#===================================
# Applications Definition
#===================================
#===================================
# Termination
#===================================
#Define a 'finish' procedure
proc finish {} {
global ns tracefile namfile
$ns flush-trace
close $tracefile
close $namfile
#exec nam out.nam &
exit 0
}
for {set i 0} {$i < $val(nn) } { incr i } {
$ns at $val(stop) "\$n$i reset"
}
$ns at 1.0 "$sT1 begin"
$ns at $val(stop) "$ns nam-end-wireless $val(stop)"
$ns at $val(stop) "finish"
$ns at $val(stop) "puts \"done\" ; $ns halt"
$ns run
运行效果截图：
参考文献：《如何在ns2中实现一个简单的网络协议》，原文基于2.31版本，本文在此基础上移植到2.35版本，进行代码修改使之适应新版并对关键代码进行注释。
原创文章，转载请注明！
复制去Google翻译
翻译结果