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linux 多网卡发送udp广播

Linux系统

一、客户端代码
#include
#include
#include
#include
#include
#include
#include
#include


int Create_destIpSendBrocast(const char *ipaddress,int port,struct sockaddr_in *addrServer){
if(ipaddress==NULL){
return -1;
}
int sockClient= socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sockClient<0){
printf ("socket create failed. ip=[%s] \n ", ipaddress);
return-1;
}
int bBroadcast = 1;
if (0 != setsockopt ( sockClient,SOL_SOCKET,SO_BROADCAST, (char *)&bBroadcast, sizeof(int))){
printf ("setsockopt failed. ip=[%s] ", ipaddress);
goto exit0;
}
struct sockaddr_in addrClient= {0};
addrClient.sin_family= AF_INET;
addrClient.sin_addr.s_addr= inet_addr(ipaddress);
addrClient.sin_port= 0; /// 0 表示由系统自动分配端口号
if (0 != bind (sockClient, (struct sockaddr*)&addrClient, sizeof(addrClient))){
printf ("bind failed.ip=[%s] \n", ipaddress);
goto exit0;
}
addrServer->sin_family = AF_INET;
addrServer->sin_addr.s_addr = htonl ( INADDR_BROADCAST );
addrServer->sin_port = htons (port);
return sockClient;
exit0:
close(sockClient);

return-1;
}


void*ThreadProc(void * arg){
charszIp[16] = {0};
strcpy (szIp, (char*)arg);
intnConunter = 0;
struct sockaddr_in addrServer;
int sockClient = Create_destIpSendBrocast((const char *)szIp,10000,&addrServer);
while(1) {
char pcSendMsg[1024] = {0};
time_trawTime;
time(&rawTime);
struct tm*t = localtime(&rawTime);
sprintf(pcSendMsg, "%04d-%02d-%02d %02d-%02d-%02d | ip=[%s]", t->tm_year+1900, t->tm_mon+1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec, szIp);
sendto ( sockClient, pcSendMsg, strlen(pcSendMsg)+1, 0, (struct sockaddr *) &addrServer, sizeof ( struct sockaddr_in ));
printf("%s\n",pcSendMsg);
sleep(1);

}
close(sockClient);
returnNULL;
}
int main(void){
char hostname[1024] = {0};
gethostname(hostname, sizeof(hostname)); //获得本地主机名
printf("hostname = %s\n",hostname);
struct hostent * hostinfo = gethostbyname(hostname); //信息结构体
struct in_addr **addr_list;
addr_list = (struct in_addr **)hostinfo->h_addr_list;
int i=0;
for(i = 0; addr_list[i] != NULL; i++) {
char *ip = inet_ntoa(*addr_list[i]);
if(ip!=NULL){
printf("%s %s \n", __func__,inet_ntoa(*addr_list[i]));
pthread_t tid;
pthread_create(&tid, 0, ThreadProc, ip);
}
}
while(1){
pause();
}
printf("exit\n");
return 0;
}







二、服务端代码
【linux 多网卡发送udp广播】#include
#include
#include


#include
#include
#include


void init_addr(struct sockaddr_in *addr, char *ip,int port)
{
addr->sin_family = AF_INET;

addr->sin_port = htons(port);
if(ip == NULL)
addr->sin_addr.s_addr = htonl(INADDR_ANY);
else
addr->sin_addr.s_addr = inet_addr(ip);
}
int create_listen_brocast(char *ipaddr,int port)
{
struct sockaddr_in addr;
const int on=1;
int fd = socket(AF_INET,SOCK_DGRAM,0);
if(fd == -1)
{
perror("create udp socket fail!");
return -1;
}
init_addr(&addr, ipaddr,port);
if(setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on))<0)
{
printf("init broadcast setsockopt failed \n");
return -1;
}
if (bind(fd, (struct sockaddr*)&addr, sizeof(struct sockaddr))<0)
{
printf("bind broadcast failed\n");
return -1;
}
return fd;
}

int main(int argc,char **argv)
{
//int sock = create_listen_udp(NULL,10000);
int sock = create_listen_brocast(NULL,10000);
if(sock<0){
printf("create sock failed \n");
return -1;
}
ssize_t ret = 0;
char buf[128]={0};
struct sockaddr_in src_addr;
int len = sizeof(struct sockaddr_in);
while(1){
ret =recvfrom(sock,(void *)buf , 128, 0,(struct sockaddr *)&src_addr, (socklen_t *)&len);
if(ret<=0){
usleep(100);
continue;
}
printf("ret = %d\n",ret);
}
return 0;
}



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