闂細UDP杩樻湁鍏朵粬涓€瀵瑰鐨勬暟鎹彂閫佹柟寮忓悧锛烾DP閫氫俊涓殑缁勬挱鏄竴绉嶅悜鐗瑰畾缁勪腑鐨勬墍鏈変富鏈轰紶杈撴暟鎹殑鏂规硶銆傜粍鎾篃绉颁负缁勬挱銆傜粍鎾暟鎹紶杈撶殑鐗圭偣锛氱粍鎾彂閫佽€呭彧鍚戠壒瀹氱殑缁勬挱缁勫彂閫?銆傜粍鍐呯殑涓绘満鍙互鎺ユ敹鏁版嵁锛岀粍鍐呯殑涓绘満鍙互閫氳繃鍔犲叆鐗瑰畾鐨勭粍鏉ユ帴鏀剁粍鍐呯殑缁勬挱鏁版嵁銆傚湪IP鍦板潃鑼冨洿鍐呭彲浠ヤ换鎰忔坊鍔犵粍鎾粍銆侱绫诲湴鍧€锛?24.0.0.0-239.255.255.255锛夆€滃姞鍏ョ粍鎾粍鈥濆彲浠ョ悊瑙ｄ负UDP缃戠粶绋嬪簭鎵€鍋氱殑鐢宠锛屽锛氱敵璇锋帴鏀跺彂寰€239.234.111.222鐨勭粍鎾暟鎹紝鍗筹細璁剧疆灞炴€?IPPROTO_IP,IP_ADD_MEMBERSHP)鍙戦€佺粍鎾暟鎹殑鏂规硶涓庡彂閫佹櫘閫歎DP鏁版嵁鐩稿悓銆傚垵姝ユ搷浣滐細璁剧疆灞炴€э紝濡傦細(IPPROTO_IP,IP_MULTICAST_TTL)娉ㄦ剰浜嬮」鍔犲叆鍚屼竴涓鎾粍鐨勪富鏈轰笉涓€瀹氬湪鍚屼竴涓綉缁溿€傚洜姝わ紝缁勬挱蹇呴』璁剧疆鏈€澶ф暟鎹浆鍙戞鏁帮紙TTL锛塗TL锛堝嵆锛歍imeToLive锛夋槸鍐冲畾鏁版嵁浼犺緭璺濈鐨勪富瑕佸洜绱犮€俆TL鐢ㄦ暣鏁拌〃绀猴紝姣忕粡杩囦竴鏉¤矾鐢卞氨鍑?銆傚綋TTL鍙樹负0鏃讹紝鏁版嵁鏃犳硶缁х画浼犺緭銆傚彧鑳界牬鍧忕粍鎾紪绋嬶細senderIP_MULTCAST_TTL锛氱敤浜庤缃粍鎾暟鎹殑鈥滄渶闀夸紶杈撹窛绂烩€濓紝榛樿1IP_MULTICAST_IF锛氱敤浜庤缃粠鍝釜缃戠粶鎺ュ彛锛堢綉鍗★級鍙戦€佺粍鎾暟鎹紝榛樿锛?.0.0.0Default0.0.0.0鍦ㄦ搷浣滅郴缁熺殑鎯呭喌涓嬩細閫夋嫨浣跨敤鍝釜缃戠粶鎺ュ彛锛屼絾鏄湪銆愬缃戝崱涓绘満銆戠殑銆愬疄闄呭伐绋嬪簲鐢ㄣ€戜腑锛屾渶濂芥墜鍔ㄦ寚瀹氾紒锛両P_MULTCAST_LOOP锛氱敤浜庤缃槸鍚﹀皢缁勬挱鏁版嵁鍙戝洖鏈満锛岄粯璁?锛?锛屽彂鍥炴湰鏈猴級remote.sin_family=AF_INET;remote.sin_addr.s_addr=inet_addr("224.1.1.168");remote.sin_port=htons(8888);setsockopt(sock,IPPROTO_IP,IP_MULTICAST_TTL,&ttl,sizeof(ttl));鍋歿len=sizeof(杩滅▼);r=鍙戦€佸埌锛堟墍浠k,buf,strlen(buf),0,(structsockaddr*)&remote,len);鐫＄湢锛?锛夛紱}鑰岋紙r>0锛夛紱缁勬挱缂栫▼锛氭帴鏀惰€匢P_ADD_MEMBRESHIP锛氱敤浜庣敵璇峰姞鍏ヤ竴涓粍鎾粍锛屽弬鏁颁负锛氱粍鎾粍鍜屾湰鍦板湴鍧€structip_mreq{//缁勫湴鍧€structin_addrinmr_multiaddr;//鏈湴涓绘満鍦板潃structin_addrimr_interface}馃憞structip_mreqgroup={0};group.imr_multiaddr.s_addr=inet_addr("224.1.1.168");group.imr_interface.s_addr=htonl(INADDR_ANY);//鐩戞帶鎵€鏈夌綉鍗etsockopt(sock,IPPROTO_IP,IP_ADD_MEMBERSHIP,&group,sizeof(group));鍋歿len=sizeof(杩滅▼);r=recvfrom(sock,buf,sizeof(buf),0,(structsockaddr*)&remote,&len);缂撳啿鍖篬r]=0;printf("r=%d\n",r);printf("msg=%s\n",buf);}while(r>0)閫€鍑哄鎾粍quit=setsockopt(sock,IP_PROTO_IP,IP_DROP_MEMBERSHIP,&group,sizeof(group));if(quit==0){break;}缂栫▼瀹為獙锛歎DP缁勬挱缂栫▼mul_tx.c#include#include#include#include#include#include#includeintmain(){intsock=0;缁撴瀯sockaddr_in杩滅▼={0};socklen_tlen=0;charbuf[128]="D.T.Software";缁撴瀯in_addr鍦板潃={0};intttl=0;鏁存暟寰幆=0锛泂ock=socket(PF_INET,SOCK_DGRAM,0);if(sock==-1){printf("濂楁帴瀛楅敊璇痋n");杩斿洖-1锛泒remote.sin_family=AF_INET;remote.sin_addr.s_addr=inet_addr("224.1.1.168");remote.sin_port=htons(8888);//------------------------ttl=0;len=sizeof(ttl);getsockopt(sock,IPPROTO_IP,IP_MULTICAST_TTL,&ttl,&len);//鍙互涓嶈缃紝ttl榛樿涓?printf("defaultttl=%d\n",ttl);ttl=32;len=sizeof(ttl);setsockopt(sock,IPPROTO_IP,IP_MULTICAST_TTL,&ttl,len);printf("褰撳墠ttl=%d\n",ttl);寰幆=0锛沴en=sizeof(寰幆);getsockopt锛堣瀛愶紝IPPROTO_IP锛孖P_MULTICAST_LOOP,&loop,&len);//涓嶈兘璁剧疆锛宼tl榛樿涓?锛屽嵆鏈満涔熶細鏀跺埌printf("defaultloop=%d\n",loop);//addr.s_addr=inet_addr("192.168.3.221");//鍏蜂綋鎸囧畾浣跨敤鍝釜缃戝崱杩涜鏁版嵁骞挎挱addr.s_addr=htonl(INADDR_ANY);//璁╂搷浣滅郴缁熼€夋嫨len=sizeof(addr);setsockopt(sock,IPPROTO_IP,IP_MULTICAST_IF,&addr,len);//涓嶅彲璁剧疆锛岄粯璁や负INADDR_ANY锛屽嵆"0.0.0.0"锛岀敱鎿嶄綔绯荤粺閫夋嫨浣跨敤鍝釜缃戝崱printf("currentif=%s\n",inet_ntoa(addr));//褰撲富鏈烘湁澶氫釜缃戝崱鏃讹紝鍦ㄥ疄闄呴」鐩腑浣跨敤鏃讹紝鏈€濂芥墜鍔ㄦ寚瀹氫娇鐢ㄥ摢涓綉鍗″箍鎾暟鎹?/--------------------------while(1){len=sizeof(remote);sendto(sock,buf,strlen(buf),0,(structsockaddr*)&remote,len);鐫¤锛?锛夛紱}鍏抽棴锛堣瀛愶級锛涜繑鍥?;}mul_rx.c#include#include#include#include#include#include#includeintmain(){intserver=0;缁撴瀯sockaddr_insaddr={0};缁撴瀯sockaddr_in杩滅▼={0};缁撴瀯ip_mreq缁?{0};int闀垮害=0;瀛楃buf[32]={0};鏁存暟r=0;鏈嶅姟鍣?濂楁帴瀛楋紙PF_INET锛孲OCK_DGRAM锛?锛夛紱if(server==-1){printf("鏈嶅姟鍣ㄥ鎺ュ瓧閿欒");杩斿洖-1锛泒saddr.sin_family=AF_INET;saddr.sin_addr.s_addr=htonl(INADDR_ANY);saddr.sin_port=htons(8888);if(bind(server,(structsockaddr*)&saddr,sizeof(saddr))==-1){printf("udp鏈嶅姟鍣ㄧ粦瀹氶敊璇痋n");杩斿洖-1锛泒printf("udp鏈嶅姟鍣ㄥ惎鍔ㄦ垚鍔焅n");group.imr_multiaddr.s_addr=inet_addr("224.1.1.168");group.imr_interface.s_addr=htonl(INADDR_ANY);setsockopt(server,IPPROTO_IP,IP_ADD_MEMBERSHIP,&group,sizeof(group));while(1){len=sizeof(杩滅▼);r=recvfrom(server,buf,sizeof(buf),0,(structsockaddr*)&remote,&len);濡傛灉锛坮>0锛墈缂撳啿鍖篬r]=0;printf("鎺ユ敹:%s\n",buf);}else{浼戞伅;}}鍏抽棴锛堟湇鍔″櫒锛夛紱return0;}鎬荤粨Unicast锛氫竴瀵逛竴鐨勬暟鎹紶杈擄紝鍗筹細鎸囧畾鍙戦€佹暟鎹箍鎾殑鐩爣涓绘満锛堝繀椤诲湪鍚屼竴涓眬鍩熺綉鍐咃級Localbroadcast锛氭湰鍦板眬鍩熺綉骞挎挱鏁版嵁锛屾墍鏈変富鏈洪兘鍙互鎺ユ敹鏁版嵁Directbroadcast锛氭寚瀹氱綉缁滃箍鎾暟鎹紝鐩爣缃戠粶鍐呯殑涓绘満鍙互鎺ユ敹鏁版嵁
