Linux下组播&广播消息小例子
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组播:
// 发送端#include <iostream>#include <stdio.h>#include <sys/socket.h>#include <unistd.h>#include <sys/types.h>#include <netdb.h>#include <netinet/in.h>#include <arpa/inet.h>#include <string.h>using namespace std;int main(){setvbuf(stdout, NULL, _IONBF, 0); fflush(stdout); int sock = -1;if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { cout<<"socket error"<<endl;return false;} const int opt = 1;//设置该套接字为广播类型,int nb = 0;nb = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(opt));if(nb == -1){cout<<"set socket error..."<<endl;return false;}struct sockaddr_in addrto;bzero(&addrto, sizeof(struct sockaddr_in));addrto.sin_family=AF_INET;addrto.sin_addr.s_addr=htonl(INADDR_BROADCAST);addrto.sin_port=htons(6000);int nlen=sizeof(addrto);while(1){sleep(1);//从广播地址发送消息char smsg[] = {"abcdef"};int ret=sendto(sock, smsg, strlen(smsg), 0, (sockaddr*)&addrto, nlen);if(ret<0){cout<<"send error...."<<ret<<endl;}else{printf("ok ");}}return 0;}
// 接收端#include <iostream>#include <stdio.h>#include <sys/socket.h>#include <unistd.h>#include <sys/types.h>#include <netdb.h>#include <netinet/in.h>#include <arpa/inet.h>#include <string.h>using namespace std;int main(){setvbuf(stdout, NULL, _IONBF, 0); fflush(stdout); // 绑定地址struct sockaddr_in addrto;bzero(&addrto, sizeof(struct sockaddr_in));addrto.sin_family = AF_INET;addrto.sin_addr.s_addr = htonl(INADDR_ANY);addrto.sin_port = htons(6000);// 广播地址struct sockaddr_in from;bzero(&from, sizeof(struct sockaddr_in));from.sin_family = AF_INET;from.sin_addr.s_addr = htonl(INADDR_ANY);from.sin_port = htons(6000);int sock = -1;if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { cout<<"socket error"<<endl;return false;} const int opt = 1;//设置该套接字为广播类型,int nb = 0;nb = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(opt));if(nb == -1){cout<<"set socket error..."<<endl;return false;}if(bind(sock,(struct sockaddr *)&(addrto), sizeof(struct sockaddr_in)) == -1) { cout<<"bind error..."<<endl;return false;}int len = sizeof(sockaddr_in);char smsg[100] = {0};while(1){//从广播地址接受消息int ret=recvfrom(sock, smsg, 100, 0, (struct sockaddr*)&from,(socklen_t*)&len);if(ret<=0){cout<<"read error...."<<sock<<endl;}else{printf("%s\t", smsg);}sleep(1);}return 0;}
Sender.cpp
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #include <time.h>
- #include <string.h>
- #include <stdio.h>
- #include <unistd.h>
- #include <stdlib.h>
- #define HELLO_PORT 12345
- #define HELLO_GROUP "225.0.0.37"
- int main(int argc, char *argv[])
- {
- struct sockaddr_in addr;
- int fd, cnt;
- struct ip_mreq mreq;
- char *message="Hello, World!";
- /* create what looks like an ordinary UDP socket */
- if ((fd=socket(AF_INET,SOCK_DGRAM,0)) < 0)
- {
- perror("socket");
- exit(1);
- }
- /* set up destination address */
- memset(&addr,0,sizeof(addr));
- addr.sin_family=AF_INET;
- addr.sin_addr.s_addr=inet_addr(HELLO_GROUP);
- addr.sin_port=htons(HELLO_PORT);
- /* now just sendto() our destination! */
- while (1)
- {
- if (sendto(fd,message, strlen(message), 0, (struct sockaddr *) &addr, sizeof(addr)) < 0)
- {
- perror("sendto");
- exit(1);
- }
- sleep(1);
- }
- return 0;
- }
Recver.cpp
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #include <time.h>
- #include <string.h>
- #include <stdio.h>
- #include <unistd.h>
- #include <stdlib.h>
- #define HELLO_PORT 12345
- #define HELLO_GROUP "225.0.0.37"
- #define MSGBUFSIZE 256
- int main(int argc, char *argv[])
- {
- struct sockaddr_in addr;
- int fd, nbytes,addrlen;
- struct ip_mreq mreq;
- char msgbuf[MSGBUFSIZE];
- u_int yes=1; /*** MODIFICATION TO ORIGINAL */
- /* create what looks like an ordinary UDP socket */
- if ((fd=socket(AF_INET,SOCK_DGRAM,0)) < 0)
- {
- perror("socket");
- exit(1);
- }
- /**** MODIFICATION TO ORIGINAL */
- /* allow multiple sockets to use the same PORT number */
- if (setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(yes)) < 0)
- {
- perror("Reusing ADDR failed");
- exit(1);
- }
- /*** END OF MODIFICATION TO ORIGINAL */
- /* set up destination address */
- memset(&addr,0,sizeof(addr));
- addr.sin_family=AF_INET;
- addr.sin_addr.s_addr=htonl(INADDR_ANY); /* N.B.: differs from sender */
- addr.sin_port=htons(HELLO_PORT);
- /* bind to receive address */
- if (bind(fd,(struct sockaddr *) &addr,sizeof(addr)) < 0)
- {
- perror("bind");
- exit(1);
- }
- /* use setsockopt() to request that the kernel join a multicast group */
- mreq.imr_multiaddr.s_addr=inet_addr(HELLO_GROUP);
- mreq.imr_interface.s_addr=htonl(INADDR_ANY);
- if (setsockopt(fd,IPPROTO_IP,IP_ADD_MEMBERSHIP,&mreq,sizeof(mreq)) < 0)
- {
- perror("setsockopt");
- exit(1);
- }
- /* now just enter a read-print loop */
- while (1)
- {
- //ssize_t recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen);
- addrlen=sizeof(addr);
- if ((nbytes=recvfrom(fd, msgbuf, MSGBUFSIZE, 0, (struct sockaddr *) &addr, (socklen_t *)&addrlen)) < 0)
- {
- perror("recvfrom");
- exit(1);
- }
- puts(msgbuf);
- }
- return 0;
- }
Makefile
- CC = gcc
- CXX = g++
- CFLAGS = -Wall -pipe -D_DEBUG -DDEBUG -g -O0
- LDFLAGS = -lstdc++
- RM = /bin/rm -f
- MODULE_INC = -I../curl-7.21.3/include -I../boost_1_45_0 -I./
- MODULE_LIB = -L../boost_1_45_0/stage/lib
- CFLAGS += $(MODULE_INC)
- LDFLAGS += $(MODULE_LIB)
- LIBOBJS = Sender.o Recver.o
- TARGET = sender recver
- all: $(TARGET)
- sender: Sender.o
- $(CXX) -o $@ $^ $(LDFLAGS)
- recver: Recver.o
- $(CXX) -o $@ $^ $(LDFLAGS)
- clean:
- rm -f *.o
- rm -f $(TARGET)
- # make rule
- %.o : %.c
- $(CC) $(CFLAGS) -c $^ -o $@
- %.o : %.cpp
- $(CC) $(CFLAGS) -c $^ -o $@
- install:
- cp -f $(TARGET) ../bin/
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