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| #include "protocol.h"
int get_info(struct nic_info *nic_info, char *if_name)
{
int sock, i, num=30;
struct ifconf if_conf;
struct ifreq *ifr;
struct sockaddr_in *addr;
if((sock = socket(PF_INET, SOCK_STREAM,0)) < 0)
{
perror("socket ");
return -1;
}
memset(&if_conf, 0, sizeof(if_conf));
if_conf.ifc_len = sizeof(struct ifreq) * num;
if_conf.ifc_buf = (__caddr_t)malloc(if_conf.ifc_len);
memset(if_conf.ifc_buf, 0, sizeof(if_conf.ifc_len));
if(ioctl(sock, SIOCGIFCONF, (char *)&if_conf) < 0)
{
perror("ioctl() - get conf ");
free(if_conf.ifc_buf);
close(sock);
return -1;
}
for(ifr = if_conf.ifc_req; ifr->ifr_name[0]; ifr++)
{
if(!strcmp(ifr->ifr_name, if_name))
{
addr = (struct sockaddr_in*)&ifr->ifr_addr;
nic_info->in_addr.s_addr = addr->sin_addr.s_addr;
if(ntohl(nic_info->in_addr.s_addr) != INADDR_LOOPBACK)
{
if(ioctl(sock, SIOCGIFHWADDR, (char*)ifr) < 0)
{
perror("ioctl() - get mac address ");
free(if_conf.ifc_buf);
close(sock);
return -1;
}
memcpy(nic_info->my_mac, ifr->ifr_hwaddr.sa_data, 6);
}
if(ioctl(sock, SIOCGIFINDEX, (char*)ifr) < 0)
{
perror("ioctl() - get ifindex ");
free(if_conf.ifc_buf);
close(sock);
return -1;
}
nic_info->ifindex = ifr->ifr_ifindex;
if(ioctl(sock, SIOCGIFBRDADDR, (char*)ifr) < 0)
{
perror("ioctl() - get broadcast addr ");
free(if_conf.ifc_buf);
close(sock);
return -1;
}
addr = (struct sockaddr_in*)&ifr->ifr_broadaddr;
nic_info->broadaddr.s_addr = addr->sin_addr.s_addr;
if(ioctl(sock, SIOCGIFNETMASK, (char *)ifr) < 0)
{
perror("ioctl() - get ifindex ");
free(if_conf.ifc_buf);
close(sock);
return -1;
}
addr = (struct sockaddr_in*)&ifr->ifr_addr;
nic_info->maskaddr.s_addr = addr->sin_addr.s_addr;
free(if_conf.ifc_buf);
close(sock);
return 0;
}
}
free(if_conf.ifc_buf);
close(sock);
return -1;
}
|