/***** 客户端广播 ***********************************************************************************************/
int ClientBroadcast(void)
{
int ret = -1;
int sock = -1;
char buf[20];
fd_set readfd;
struct timeval timeout;
struct sockaddr_in broadcast_addr; //本地地址
struct sockaddr_in from_addr; //客户端地址
int len = sizeof(struct sockaddr_in);
//socket
sock = socket(AF_INET, SOCK_DGRAM, 0);
if(0 > sock)
{
perror("client socket err");
return -1;
}
//get broadcast addr
if( GetBroadcastAddr(sock, &broadcast_addr) )
{
printf("get broadcast addr failed!\n");
goto _out;
}
//set broadcast
if( SetBroadcast(sock, &broadcast_addr) )
{
printf("set broadcast failed!\n");
goto _out;
}
while(1)
{
//send
ret = sendto(sock, IP_FOUND, strlen(IP_FOUND) + 1, 0, (struct sockaddr *)&broadcast_addr, len);
if(0 > ret)
{
perror("server send err");
goto _out;
}
//文件描述符集合清零
FD_ZERO(&readfd);
//将套接字文件描述符加入读集合
FD_SET(sock, &readfd);
//超时时间
timeout.tv_sec = 5; //秒
timeout.tv_usec = 0; //微秒
//监听套接字sock是否有数据可读，超时为5秒
ret = select(sock+1, &readfd, NULL, NULL, &timeout);
switch(ret)
{
case -1:
printf("select error!\n");
goto _out;
case 0:
printf("time out!\n");
break;
default:
{
//sock套接口有数据可读
if( FD_ISSET(sock, &readfd) )
{
//recieve
ret = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *)&from_addr, &len);
if(0 > ret)
{
perror("server recieve err");
goto _out;
}
printf("buf : %s\n", buf);
//如果与IP_FOUND吻合
if( strstr(buf, IP_FOUND_ACK) )
{
printf("IP is %s\n", inet_ntoa(from_addr.sin_addr));
}
}
}
}
}
//close
close(sock);
return 0;
_out:
close(sock);
return -1;
}
int GetIfStatus(int sk,char *vifdev,char *vaddress,char *vnetmask,char *vbroadcast)
{ struct sockaddr_in *sin;
struct sockaddr_in netmask;
int insane = false;
struct hostent *hp;
struct in_addr inaddr;
Verbose("Checking interface status...\n");
if ((hp = gethostbyname(VSYSNAME.nodename)) == NULL)
{
CfLog(cferror,"","gethostbyname");
return false;
}
else
{
memcpy(&inaddr,hp->h_addr,hp->h_length);
Verbose("Address given by nameserver: %s\n",inet_ntoa(inaddr));
}
strcpy(IFR.ifr_name,vifdev);
if (ioctl(sk,SIOCGIFADDR, (caddr_t) &IFR) == -1) /* Get the device status flags */
{
return false;
}
sin = (struct sockaddr_in *) &IFR.ifr_addr;
if (strlen(vaddress) > 0)
{
if (strcmp(vaddress,(char *)inet_ntoa(sin->sin_addr)) != 0)
{
CfLog(cferror,"This machine is configured with an address which differs from\n","");
CfLog(cferror,"the cfagent configuration\n","");
CfLog(cferror,"Don't know what to do yet...\n","");
insane = true;
}
}
if (strcmp((char *)inet_ntoa(*(struct in_addr *)(hp->h_addr)),(char *)inet_ntoa(sin->sin_addr)) != 0)
{
CfLog(cferror,"This machine is configured with an address which differs from\n","");
CfLog(cferror,"the nameserver's information! (Insane!)\n","");
CfLog(cferror,"Don't quite know what to do...\n","");
insane = true;
}
if (ioctl(sk,SIOCGIFNETMASK, (caddr_t) &IFR) == -1)
{
return false;
}
netmask.sin_addr = ((struct sockaddr_in *) &IFR.ifr_addr)->sin_addr;
Verbose("Found netmask: %s\n",inet_ntoa(netmask.sin_addr));
strcpy(VBUFF,inet_ntoa(netmask.sin_addr));
if (strcmp(VBUFF,vnetmask))
{
CfLog(cferror,"The netmask is incorrectly configured, resetting...\n","");
insane = true;
}
if (ioctl(sk,SIOCGIFBRDADDR, (caddr_t) &IFR) == -1)
{
return false;
}
sin = (struct sockaddr_in *) &IFR.ifr_addr;
strcpy(VBUFF,inet_ntoa(sin->sin_addr));
Verbose("Found broadcast address: %s\n",inet_ntoa(sin->sin_addr));
GetBroadcastAddr(inet_ntoa(inaddr),vifdev,vnetmask,vbroadcast);
if (strcmp(VBUFF,VNUMBROADCAST) != 0)
{
snprintf(OUTPUT,CF_BUFSIZE*2,"Broadcast address was %s not %s (should be bit-type %s)\n",VBUFF,VNUMBROADCAST,vbroadcast);
CfLog(cferror,OUTPUT,"");
insane = true;
}
return(insane);
}
