#include #include #include #include #include #include #include #include

int SetIfAddr(char *ifname, char *Ipaddr, char *mask,char *gateway)

{

int fd;

int rc;

struct ifreq ifr;

struct sockaddr_in *sin;

struct rtentry  rt;

fd = socket(AF_INET, SOCK_DGRAM, 0);

if(fd < 0)

{

perror("socket   error");

return -1;

}

memset(&ifr,0,sizeof(ifr));

strcpy(ifr.ifr_name,ifname);

sin = (struct sockaddr_in*)&ifr.ifr_addr;

sin->sin_family = AF_INET;

//ipaddr

if(inet_aton(Ipaddr,&(sin->sin_addr)) < 0)

{

perror("inet_aton   error");

return -2;

}

if(ioctl(fd,SIOCSIFADDR,&ifr) < 0)

{

perror("ioctl   SIOCSIFADDR   error");

return -3;

}

//netmask

if(inet_aton(mask,&(sin->sin_addr)) < 0)

{

perror("inet_pton   error");

return -4;

}

if(ioctl(fd, SIOCSIFNETMASK, &ifr) < 0)

{

perror("ioctl");

return -5;

}

//gateway

memset(&rt, 0, sizeof(struct rtentry));

memset(sin, 0, sizeof(struct sockaddr_in));

sin->sin_family = AF_INET;

sin->sin_port = 0;

if(inet_aton(gateway, &sin->sin_addr)<0)

{

printf ( "inet_aton error\n" );

}

memcpy ( &rt.rt_gateway, sin, sizeof(struct sockaddr_in));

((struct sockaddr_in *)&rt.rt_dst)->sin_family=AF_INET;

((struct sockaddr_in *)&rt.rt_genmask)->sin_family=AF_INET;

rt.rt_flags = RTF_GATEWAY;

if (ioctl(fd, SIOCADDRT, &rt)<0)

{

zError( "ioctl(SIOCADDRT) error in set_default_route\n");

close(fd);

return -1;

}

close(fd);

return rc;

}

linux用指令来设置IP,MASK,GATEWAY：

//终端指令实现

//ifconfig eth0 192.168.0.0 netmask 255.255.0.0

//route add default gw 10.240.0.0

//C代码实现

char IP[24] = "192.168.1.0";

char Mask[24] = "255.255.0.0“;

char gateway[24] = "10.240.0.0";

char cmd_IP_Mask[64] = {0};

char cmd_GW[64] = {0};

sprintf(cmd_IP_Mask, "ifconfig eth0 %s netmask %s", IP, Mask);

sprintf(cmd_GW, "route add default gw %s netmask %s", gateway);

unsigned int IP_Address = inet_addr(IP),将点间隔的IP地址转换成长整形的数据

将长整形的IP地址以点阵形式输出：

printf("GetHostIp:IP...%s\n",inet_ntoa( IP_Address ));

//如果应用传入的是长整形的ip ,mask ,gw，用以下C代码来实现转换---可以直接拿来用的，已经测试通过

#define SIN_ADDR(x) (((struct sockaddr_in *) (&(x)))->sin_addr.s_addr)

#define SET_SA_FAMILY(addr, family) \

memset((char*)&(addr), '\0',   sizeof(addr)); \

addr.sa_family = (family)

char ipaddr[20];

char netmask[20];

char gateway[20];

sprintf(ipaddr, "%d.%d.%d.%d", (ip&0xff000000)>>24,

(ip&0xff0000)>>16, (ip&0xff00)>>8, (ip&0xff));

sprintf(netmask, "%d.%d.%d.%d", (mask&0xff000000)>>24,

(mask&0xff0000)>>16, (mask&0xff00)>>8,

(mask&0xff));

sprintf(gateway, "%d.%d.%d.%d", (gw&0xff000000)>>24,

(gw&0xff0000)>>16, (gw&0xff00)>>8,

(gw&0xff));

static int set_ipaddr(char *ipaddr){

int s;

if((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)

{

return FAIL;

}

struct ifreq ifr;

bzero((char *)&ifr, sizeof(ifr));

strcpy(ifr.ifr_name,"eth0");

struct sockaddr_in addr;

bzero(&addr, sizeof(struct sockaddr_in));

addr.sin_family = AF_INET;

inet_aton(ipaddr,&addr.sin_addr);//将输入字符转成网络地址

memcpy((char*)&ifr.ifr_ifru.ifru_addr, (char*)&addr, sizeof(struct sockaddr_in));

if(ioctl(s, SIOCSIFADDR, &ifr) < 0)

{

close(s);

return FAIL;

}

close(s);

return OK;

}

static int set_netmask(char *netmask){

int s;

if((s = socket(AF_INET,SOCK_DGRAM, 0)) < 0)

{

KK_ERROR("[set_netmask]create socket failed:line:%d\n",__LINE__);

return FAIL;

}

struct ifreq ifr;

bzero((char *)&ifr, sizeof(ifr));

strcpy(ifr.ifr_name,"eth0");

struct sockaddr_in netmask_addr;

bzero(&netmask_addr, sizeof(struct sockaddr_in));

netmask_addr.sin_family = AF_INET;

inet_aton(netmask, &netmask_addr.sin_addr);

memcpy((char*)&ifr.ifr_ifru.ifru_netmask, (char*)&netmask_addr, sizeof(struct sockaddr_in));

if(ioctl(s,SIOCSIFNETMASK,&ifr) < 0)

{

close(s);

KK_ERROR("[set_netmask]ioctl failed:line:%d\n",__LINE__);

return FAIL;

}

close(s);

return OK;

}

static int set_gateway(char *gateway)

{

static int sock_fd = -1;

struct rtentry rt;

U32 dstaddr, gwaddr;

dstaddr = inet_addr("0.0.0.0");

gwaddr = inet_addr(gateway);

/* Get an internet socket for doing socket ioctls. */

sock_fd = socket(AF_INET, SOCK_DGRAM, 0);

memset(&rt, 0, sizeof(rt));

/*set Destination addr*/

SET_SA_FAMILY (rt.rt_dst, AF_INET);

SIN_ADDR(rt.rt_dst) = dstaddr;

/*set gw addr*/

SET_SA_FAMILY (rt.rt_gateway, AF_INET);

SIN_ADDR(rt.rt_gateway) = gwaddr;

/*set genmask addr*/

SET_SA_FAMILY (rt.rt_genmask, AF_INET);

SIN_ADDR(rt.rt_genmask) = 0L;

rt.rt_dev = "eth0";

rt.rt_flags = RTF_GATEWAY;

if(ioctl(sock_fd, SIOCADDRT, &rt) < 0)

{

close(sock_fd);

KK_ERROR("[set_gateway]ioctl failed:line:%d\n",__LINE__);

return FAIL;

}

return OK;

}