我已经用C语言编写了用ioctl
设置默认网关的代码。我有一个设置网关的函数和常用的main函数。当我编译并运行代码时,它工作得很好,但是当我将其转换为库并使用ctypes
从python调用main函数时,ioctl
调用失败。为什么会这样?你知道吗
注意:在使用ctypes
方法之前,我尝试使用fcntl
、ioctl
和socket
从python设置gateway,但是失败了,OSError
说invalid arguments
。你知道吗
int setDefaultGW( int sockfd, char* gatewatStr)
{
struct sockaddr_in *dst, *gw, *mask;
struct rtentry route;
in_addr_t gip;
fprintf( stderr,"socket %d\n", sockfd);
fprintf( stderr,"Address %s\n", gatewatStr);
gip = inet_addr(gatewatStr);
fprintf( stderr,"Address %d\n", gip);
memset(&route,0,sizeof(struct rtentry));
dst = (struct sockaddr_in *)(&(route.rt_dst));
gw = (struct sockaddr_in *)(&(route.rt_gateway));
mask = (struct sockaddr_in *)(&(route.rt_genmask));
/* Make sure we're talking about IP here */
dst->sin_family = AF_INET;
gw->sin_family = AF_INET;
mask->sin_family = AF_INET;
/* Set up the data for adding the default route */
dst->sin_addr.s_addr = inet_addr("0.0.0.0");
gw->sin_addr.s_addr = gip;
mask->sin_addr.s_addr = inet_addr("0.0.0.0");
route.rt_metric = 100;
route.rt_flags = RTF_UP | RTF_GATEWAY;
/* Remove this route if it already exists */
ioctl(sockfd,SIOCDELRT,&route);
/* Add the default route */
if( ioctl(sockfd,SIOCADDRT,&route) < 0 )
{
fprintf( stderr,"Adding default route: %d\n", errno);
return -1;
}
fprintf( stdout,"Added default route successfully.\n" );
return 0;
}
int main(){
int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd == -1)
{
perror("socket creation failed\n");
return;
}
setDefaultGW(sockfd, "192.168.6.1");
return 0;
}
gatewayFun = ctypes.CDLL("./libgateway.so")
gatewayFun.main()
运行C二进制文件:
./gateway
socket 3
Address 192.168.6.1
Address 17213632
Added default route successfully.
运行python脚本:
# python3 net.py
socket 4
Address 192.168.6.1
Address 17213632
Adding default route: 101
目前没有回答
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