Ubuntu 10.04 校园网通插件解决方案（西邮）

以前一直用wine装的网通插件，就是装好后运行ishare_user.exe的那个。最近插件突然不能用了，重装老是在装winpcap那儿报错，没办法，就google了另一个方法。
       （不知道怎么发附件，只好贴源代码了……）
        1.copy下面的源代码，保存成drcom.c（名字其实无所谓）
#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
 
typedef struct _code2 {
    char sign;
    char type;
    short len;
    int id;
    int code0;
    int code1;
}code2;
 
typedef struct _code3 {
    char sign;
    char type;
    short len;
    int id;
    int unk0;
    int code1;
    int unk1;
    int code0;
    int check;
    int unk2;
    char mac[6];
    char dhcp;
    char devtype;
    int ipaddr;
    int netmask;
    char padding[48];
}code3;
 
int waitdata(int hsocket, int time)
{
    fd_set fds;
    struct timeval tv;
 
    FD_ZERO(&fds);
    FD_SET(hsocket,&fds);
    tv.tv_usec = time;
    tv.tv_sec = 0;
    return select(hsocket+1,&fds,NULL,NULL,&tv);
}
 
 
main (int argc, char* argv[])
{
    struct in_addr ip,netmask,ptp;
    char mac[6];
    int hsocket;
    struct ifreq ifr;
    struct sockaddr_in sin;
    struct sockaddr *sa = (struct sockaddr *) &sin;
    int fromlen;
    struct sockaddr_in *sin_ptr;
    u_char *ptr;
    u_long *ptr_long;
    int n;
    int check;
    char c1[] = {7,1,8,0,1,0,0,0};
    code2 c2;
    code3 c3;
    char c4[512];
    int sendlen, recvlen;
    int errorcount,workwell,noticed=0;
 
    printf("\nFree Dr.COM for Linux  v0.3\n  mengxp works,2009 @ xiyou\n  \n\n");

init:
    if ((hsocket = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
    {
        perror( "socket error!");
        return 0;
    }
 
    errorcount = 0;
    strcpy(ifr.ifr_name, "ppp0");
    if (ioctl(hsocket, SIOCGIFADDR, &ifr) < 0)
    {
//        perror("ioctl SIOCGIFADDR error");
        errorcount++;
    }
    sin_ptr = (struct sockaddr_in *)&ifr.ifr_addr;
    ip = sin_ptr->sin_addr;
 
    if (ioctl(hsocket, SIOCGIFNETMASK, &ifr) < 0)
    {
//        perror("ioctl SIOCGIFNETMASK error");
        errorcount++;
    }
    sin_ptr = (struct sockaddr_in *)&ifr.ifr_addr;
    netmask = sin_ptr->sin_addr;

    if (ioctl(hsocket, SIOCGIFDSTADDR, &ifr) < 0)
    {
//        perror("ioctl SIOCGIFDSTADDR error");
        errorcount++;
    }
    sin_ptr = (struct sockaddr_in *)&ifr.ifr_addr;
    ptp = sin_ptr->sin_addr;
    memset(&mac,0,6);
 
    if(errorcount)
    {
        close(hsocket);
        if(!noticed)
            printf("couldn't get ppp0 interface!\nplease check your connection!\n\n");
        noticed++;
        sleep(3);
        goto init;
    }
    else
        noticed = 0;

    printf("ppp0 interface:\n");
    printf(" IP:      %s\n", inet_ntoa(ip));
    printf(" NetMask: %s\n", inet_ntoa(netmask));
    printf(" Server:  %s\n\n", inet_ntoa(ptp));