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#include <sys/types.h>
#include <string.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <stdio.h>
#include <errno.h>
#include <net/if.h>
#include <sys/utsname.h>
#include <limits.h>
#include <ctype.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <linux/sockios.h>
#include <sys/socket.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netdb.h>
#include <netinet/in.h>
#define JOSEPH_LOOP_INTERFACE "lo"
#define JOSEPH_ETH_INTERFACE "eth0"
#define JOSEPH_WIRLESS_INTERFACE "wlan0"
#define ETHTOOL_GLINK 0x0000000a /* Get link status (ethtool_value) */
#define JSOEPH_NET_CHECK_PACKET_SIZE 4096
#define JOSEPH_NET_CHECK_TIME 3000
typedef struct Joseph_Net_Interface_Info
{
int net_device_type;// 0 ~ eth0 ; 1 ~ wlan ;3 ~ ppp0
int net_device_priority;// 0 ~ eth0 ; 1 ~ wlan ;3 ~ ppp0
int net_device_status;//0 ~ down; 1 ~ up
int net_device_link_status;//0 ~ no ;1 ~ yes
char net_device_name[8];
char net_device_ip[16];
char net_device_mac_info[32];
char net_device_gw_info[16];
char net_device_mask_info[16];
char net_device_broadcast_info[16];
}JOSEPH_NET_INTERFACE_INFO;
typedef struct Joseph_Ethtool_Value {
unsigned int cmd;
unsigned int data;
}JOSEPH_ETHTOOL_VALUE;
enum Joseph_Net_Device_Type
JOSEPH_ETH = 0,
JOSEPH_WIFI = 1,
JOSEPH_3G = 2,
}JOSEPH_NET_DEVICE_TYPE;
unsigned short Joseph_Cal_Chksum(unsigned short *addr, int len)
{
int nleft=len;
int sum=0;
unsigned short *w=addr;
unsigned short answer=0;
while(nleft > 1)
{
sum += *w++;
nleft -= 2;
}
if( nleft == 1)
{
*(unsigned char *)(&answer) = *(unsigned char *)w;
sum += answer;
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
answer = ~sum;
return answer;
}
int Joseph_Ping( char *ips,char *srcip , int timeout)
{
int n;
pid_t pid;
int maxfds = 0;
fd_set readfds;
struct ip *iph;
struct icmp *icmp;
struct timeval *tval;
struct sockaddr_in addr;
struct sockaddr_in from;
struct ifreq ifr;
bzero(&addr,sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr(ips);
int sockfd;
sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
if (sockfd < 0)
{
printf("ip:%s,socket error\n",ips);
return -1;
}
struct timeval timeo;
timeo.tv_sec = timeout / 1000;
timeo.tv_usec = timeout % 1000;
#if 0
/*set src ip*/
bzero(&from,sizeof(from)); /* 設定Ip資訊 */
from.sin_family = AF_INET;
from.sin_addr.s_addr = inet_addr(srcip);
if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_IF,(struct sockaddr *)&from, sizeof(from)) == -1)
printf("ip:%s,setsockopt error \n",srcip);
return ERROR;
bind(sockfd,(struct sockaddr *)&addr, sizeof(addr));
#else
strcpy(ifr.ifr_name, srcip);
if (setsockopt(sockfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)) == -1)
{
printf("can't bind to interface %s\n",ifr.ifr_name);
}
#endif
if (setsockopt(sockfd, SOL_SOCKET, SO_SNDTIMEO, &timeo, sizeof(timeo)) == -1)
printf("ip:%s,setsockopt error\n",ips);
return -1;
else
;
char sendpacket[JSOEPH_NET_CHECK_PACKET_SIZE];
char recvpacket[JSOEPH_NET_CHECK_PACKET_SIZE];
memset(sendpacket, 0, sizeof(sendpacket));
pid = getpid();
icmp=(struct icmp*)sendpacket;
icmp->icmp_type = ICMP_ECHO;
icmp->icmp_code = 0;
icmp->icmp_cksum = 0;
icmp->icmp_seq = 0;
icmp->icmp_id = pid;
tval = (struct timeval *)icmp->icmp_data;
gettimeofday(tval,NULL);
icmp->icmp_cksum=Joseph_Cal_Chksum((unsigned short *)icmp,sizeof(struct icmp));
n = sendto(sockfd, (char *)&sendpacket, sizeof(struct icmp), 0, (struct sockaddr *)&addr, sizeof(addr));
if (n < 1)
printf("ip:%s,sendto error\n",ips);
while(1)
FD_ZERO(&readfds);
FD_SET(sockfd, &readfds);
maxfds = sockfd + 1;
n = select(maxfds, &readfds, NULL, NULL, &timeo);
if (n <= 0)
{
printf("ip:%s,Time out error\n",ips);
close(sockfd);
return -1;
}
memset(recvpacket, 0, sizeof(recvpacket));
int fromlen = sizeof(from);
n = recvfrom(sockfd, recvpacket, sizeof(recvpacket), 0, (struct sockaddr *)&from, (socklen_t *)&fromlen);
if (n < 1)
{
return -1;
char *from_ip = (char *)inet_ntoa(from.sin_addr);
if (strcmp(from_ip,ips) != 0)
printf("NowPingip:%s Fromip:%s\nNowPingip is not same to Fromip,so Joseph_Ping wrong!\n",ips,from_ip);
continue;
iph = (struct ip *)recvpacket;
icmp = (struct icmp *)(recvpacket + (iph->ip_hl << 2));
if (icmp->icmp_type == ICMP_ECHOREPLY && icmp->icmp_id == pid)
return 0;
else
}
return 0;
}
int Joseph_Check_Net_Status(char *if_name)
int Qy_Ret = 0;
if(strlen(if_name) <= 0)
Qy_Ret = -1;
return Qy_Ret;
char aPing[16]="202.108.22.5"; /* Joseph_Ping form ip */
if(Joseph_Ping(aPing,if_name,JOSEPH_NET_CHECK_TIME) == 0)
printf("Network is Ok!\n");
Qy_Ret = 0;
else
printf("Network is Bad!\n");
return Qy_Ret;
/*
Author : kj
Time : 2014-08-09
Function :
get ip gw mac broadcast
*/
int Joseph_Get_Net_Device_Info(JOSEPH_NET_INTERFACE_INFO *Joseph_Net_Interface_Info_In)
int device_itertion = 0;
int Joseph_Net_Interface_Sfd = 0;
int Joseph_Net_Interface_exist = 0;
struct ifreq Joseph_Net_Ifr;
struct ifconf Joseph_Ifc;
struct sockaddr_in *sin = (struct sockaddr_in*)&Joseph_Net_Ifr.ifr_addr;
struct sockaddr_in *broadcast = (struct sockaddr_in*)&Joseph_Net_Ifr.ifr_broadaddr;
if(Joseph_Net_Interface_Info_In == NULL)
Joseph_Net_Interface_Sfd = socket(AF_INET,SOCK_DGRAM,0);
if(Joseph_Net_Interface_Sfd < 0){
perror("socket error");
return -1;
memset(&Joseph_Net_Ifr,0,sizeof(Joseph_Net_Ifr));
Joseph_Ifc.ifc_len = sizeof(Joseph_Net_Ifr);
Joseph_Ifc.ifc_buf = (caddr_t)&Joseph_Net_Ifr;
for(device_itertion = 1;device_itertion < 5;device_itertion++)
Joseph_Net_Ifr.ifr_ifindex = device_itertion;
Qy_Ret = ioctl(Joseph_Net_Interface_Sfd,SIOCGIFNAME,&Joseph_Net_Ifr);
if(Qy_Ret)
{
Joseph_Net_Interface_exist = 0;
}
else
if(strcmp(Joseph_Net_Ifr.ifr_name,Joseph_Net_Interface_Info_In->net_device_name) == 0)
{
printf("The %dst net device is : %s\n",Joseph_Net_Ifr.ifr_ifindex,Joseph_Net_Ifr.ifr_name);
Joseph_Net_Interface_exist = 1;
/*Judge card type of net device*/
Qy_Ret = ioctl (Joseph_Net_Interface_Sfd, SIOCGIFFLAGS,&Joseph_Net_Ifr);
if(!Qy_Ret)
{
/*judge the status of net device*/
if (Joseph_Net_Ifr.ifr_flags & IFF_UP)
{
puts("the interface status is UP");
}
else
puts("the interface status is DOWN");
}
break;
}
if(Joseph_Net_Interface_exist == 0)
printf("%s:[%d] No Such Device of %s !\n",__FUNCTION__,__LINE__,Joseph_Net_Interface_Info_In->net_device_name);
/*get net device mac addr*/
Qy_Ret = ioctl(Joseph_Net_Interface_Sfd,SIOCGIFHWADDR,&Joseph_Net_Ifr);
if(!Qy_Ret)
sprintf(Joseph_Net_Interface_Info_In->net_device_mac_info,"%02x:%02x:%02x:%02x:%02x:%02x",\
(unsigned char)Joseph_Net_Ifr.ifr_hwaddr.sa_data[0],\
(unsigned char)Joseph_Net_Ifr.ifr_hwaddr.sa_data[1],\
(unsigned char)Joseph_Net_Ifr.ifr_hwaddr.sa_data[2],\
(unsigned char)Joseph_Net_Ifr.ifr_hwaddr.sa_data[3],\
(unsigned char)Joseph_Net_Ifr.ifr_hwaddr.sa_data[4],\
(unsigned char)Joseph_Net_Ifr.ifr_hwaddr.sa_data[5]);
printf("Mac address is : %02x:%02x:%02x:%02x:%02x:%02x\n",\
printf("Mac address is : 00:00:00:00:00:00\n");
/*get net device ip */
memset(Joseph_Net_Interface_Info_In->net_device_ip,0,16);
Qy_Ret = ioctl(Joseph_Net_Interface_Sfd,SIOCGIFADDR,&Joseph_Net_Ifr);
inet_ntop(AF_INET,&sin->sin_addr.s_addr,Joseph_Net_Interface_Info_In->net_device_ip,16);
printf("IP address is : %s\n",Joseph_Net_Interface_Info_In->net_device_ip);
}else
printf("IP address is : 0.0.0.0\n");
/*get broadcast addr*/
memset(Joseph_Net_Interface_Info_In->net_device_broadcast_info,0,16);
Qy_Ret = ioctl(Joseph_Net_Interface_Sfd,SIOCGIFBRDADDR,&Joseph_Net_Ifr);
inet_ntop(AF_INET,&broadcast->sin_addr.s_addr,Joseph_Net_Interface_Info_In->net_device_broadcast_info,16);
printf("BROADCAST IP is : %s\n",Joseph_Net_Interface_Info_In->net_device_broadcast_info);
printf("BROADCAST IP is : 0.0.0.0\n");
/*get mask info*/
Qy_Ret = ioctl(Joseph_Net_Interface_Sfd,SIOCGIFNETMASK,&Joseph_Net_Ifr);
if (!Qy_Ret)
inet_ntop(AF_INET,&sin->sin_addr.s_addr,Joseph_Net_Interface_Info_In->net_device_mask_info,16);
printf("NetMask is : %s\n",Joseph_Net_Interface_Info_In->net_device_mask_info);
/****************************************************************
return value:
-1 -- error , details can check errno
1 -- interface link up
0 -- interface link down.
****************************************************************/
int Joseph_Get_Netlink_Status(const char *if_name)
int skfd;
struct ifreq ifr;
JOSEPH_ETHTOOL_VALUE edata;
edata.cmd = ETHTOOL_GLINK;
edata.data = 0;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, if_name, sizeof(ifr.ifr_name) - 1);
ifr.ifr_data = (char *)&edata;
if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) == 0)
return -1;
if (ioctl(skfd, SIOCETHTOOL, &ifr) == -1)
close(skfd);
return -1;
close(skfd);
return edata.data;
int main(int argc,char *argv[])
JOSEPH_NET_INTERFACE_INFO Joseph_Net_Interface_Info;
memset(&Joseph_Net_Interface_Info,0,sizeof(JOSEPH_NET_INTERFACE_INFO));
if(argc < 2)
system("ifconfig eth0 up");
sleep(3);
strcpy(Joseph_Net_Interface_Info.net_device_name,argv[1]);
Qy_Ret = Joseph_Get_Netlink_Status(argv[1]);
if(Qy_Ret == 1)
printf("%s:[%d] The netlink is up !\n",__FUNCTION__,__LINE__);
printf("%s:[%d] The netlink is down , Begin go to wifi !\n",__FUNCTION__,__LINE__);
NET_INIT:
/*after 5s , if no ip ,then killall udhcpc ,then go to wifi*/
system("killall -9 udhcpc");
system("udhcpc -i eth0");
Qy_Ret = Joseph_Check_Net_Status(argv[1]);
if(Qy_Ret == 0)
Joseph_Get_Net_Device_Info(&Joseph_Net_Interface_Info);
NET_RUN:
while(1)
Qy_Ret = Joseph_Get_Netlink_Status(argv[1]);
if(Qy_Ret == 1)
printf("Net link status: %s\n", Qy_Ret == 1 ? "up" : "down");
Qy_Ret = Joseph_Check_Net_Status(argv[1]);
if(Qy_Ret < 0)
break;//do nothing
printf("%s:[%d] The netlink is down !\n",__FUNCTION__,__LINE__);
sleep(1);
goto NET_INIT;
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