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藍森林 http://www.lslnet.com 2006年6月6日 10:18
 如何在FreeBSD下實現獲取MAC地址？謝謝
我用sysctl來獲取MAC地址，但是不能取的MAC地址列表，是怎麼回事？我的代碼如下：
unsigned char *ip2mac(const unsigned long target_ip, unsigned char* target_mac)
{
int s, mib[6];
size_t len;
int i=0;
char *buf;
struct rt_msghdr *rtm;
struct sockaddr_inarp *sin;
struct sockaddr_dl *sdl;
int j;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = AF_INET;
mib[4] = NET_RT_FLAGS;
mib[5] = RTF_LLINFO;
if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
return NULL;
if ((buf = malloc(len)) == NULL)
return NULL;
printf("len = %d\n", len);
if (sysctl(mib, 6, buf, &len, NULL, 0) < 0)
{
free(buf);
return NULL;
}
for(s = 0; s < len; s+= rtm->;rtm_msglen) {
rtm = (struct rt_msghdr *)(buf + s);
printf("%d\n", rtm->;rtm_msglen);
sin = (struct sockaddr_inarp *)(rtm + 1);
sdl = (struct sockaddr_dl *)((char*)sin+1);
if (target_ip == sin->;sin_addr.s_addr) {
memset(target_mac, 0, sizeof(target_mac));
bcopy((char *)LLADDR(sdl), target_mac, 6);
free(buf);
return target_mac;
}
}
free(buf);
return NULL;
} |
如何在FreeBSD下實現獲取MAC地址？謝謝
能夠詳細解釋一下您說的MAC地址列表是什麼意思？
你的程序這一段表示如果取得了與傳入IP匹配的MAC地址，就返回了。
if (target_ip == sin->;sin_addr.s_addr) {
memset(target_mac, 0, sizeof(target_mac));
bcopy((char *)LLADDR(sdl), target_mac, 6);
free(buf);
return target_mac;
}
我對網絡的理解是一個IP只能對應一個MAC地址，但是一個MAC地址可以對應多個IP，如網關。 |
如何在FreeBSD下實現獲取MAC地址？謝謝
sorry，我寫錯了，我就是想獲得一個MAC地址，但是上面代碼我不能獲得mac地址 |
如何在FreeBSD下實現獲取MAC地址？謝謝
這是修改後的程序，我在FreeBSD 4.4-RELEASE下編譯運行成功
int ip2mac(u_long target_ip, unsigned char* target_mac){
int s, mib[6];
size_t len;
int i=0,j=0;
char *buf;
struct rt_msghdr *rtm;
struct sockaddr_inarp *sin;
struct sockaddr_dl *sdl;
u_long tmp_ip;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = AF_INET;
mib[4] = NET_RT_FLAGS;
mib[5] = RTF_LLINFO;
if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0)return 0;
if((buf = (char*)malloc(len)) == NULL)return 0;
printf("len = %d\n", len);
if (sysctl(mib, 6, buf, &len, NULL, 0) < 0){
free(buf);return 0;
}
for(s = 0; s < len; s+= rtm->;rtm_msglen){
rtm = (struct rt_msghdr *)(buf + s);
printf("%d\n", rtm->;rtm_msglen);
sin = (struct sockaddr_inarp *)(rtm + 1);
//sdl = (struct sockaddr_dl *)((char*)sin+1);
sdl = (struct sockaddr_dl *)(sin+1);
//printf("%s\n",inet_ntoa(sin->;sin_addr));
tmp_ip=(u_long)(sin->;sin_addr.s_addr);
if(target_ip==tmp_ip){
memset(target_mac, 0, sizeof(target_mac));
//bcopy((char *)LLADDR(sdl), target_mac, 6);
//bcopy(target_mac,(char *)LLADDR(sdl),6);
strcpy(target_mac,link_ntoa(sdl));
free(buf);
return 1;
}
}
free(buf);
return 0;
}
main(int argc,char* argv[]){
unsigned char macstr[256];
if(argc==1){
printf("Usage:\tip2mac sourceIP\n");
return;
}
memset(macstr,0,256);
if(ip2mac(inet_addr(argv[1]),macstr)){
printf("%s\n",macstr);
}
else printf("error\n");
} |
如何在FreeBSD下實現獲取MAC地址？謝謝
liupch,謝謝
1、sdl = (struct sockaddr_dl *)((char*)sin+1);這句是不是這樣更好些；如果按你寫的，編譯報告：arithmetic on pointer to an incomplete type。
2、tmp_ip=(u_long)(sin->;sin_addr.s_addr)這句我編譯不過去，提示：dereferencing pointer to incomplete type。
我用的是FreeBSD 4.6-RELEASE，編譯器是gcc version 2.95.3 20010315 (release) [FreeBSD]。
望請指教。謝謝。 |
如何在FreeBSD下實現獲取MAC地址？謝謝
首先sdl = (struct sockaddr_dl *)((char*)sin+1);就是這句話有問題
因為你首先把sin這個指針轉化成(char*)型，轉化之後再+1，這樣實際上相當於是一個char*的指針加一。而實際的結果應該是sockaddr_inarp 類型的指針加一。
第二個問題我也遇到了，主要是沒有包含正確的頭文件。我一共包含了如下頭文件
#include <sys/types.h>;
#include <sys/socket.h>;
#include <sys/ioctl.h>;
#include <netinet/in.h>;
#include <netinet/if_ether.h>;
#include <sys/sysctl.h>;
#include <sys/types.h>;
#include <net/route.h>;
#include <net/if_dl.h>;
#include <stdio.h>;
#include <string.h>;
#include <fcntl.h>;
我的系統是FreeBSD 4.3-RELEASE
gcc version 2.95.3 [FreeBSD] 20010315 (release) |
如何在FreeBSD下實現獲取MAC地址？謝謝
還有一點就是這個程序只能取得本機IP的MAC地址，不能取得其他IP的MAC地址 |
如何在FreeBSD下實現獲取MAC地址？謝謝
liupch：謝謝，我編譯成功了！ |
如何在FreeBSD下實現獲取MAC地址？謝謝
如何取得其它機器的ip和mac呢？？？ |
如何在FreeBSD下實現獲取MAC地址？謝謝
我這個好像更簡單：（linux 7.2上通過)#include <stdio.h>;
#include <string.h>;
#include <netdb.h>;
#include <arpa/inet.h>;
#include <netinet/in.h>;
#include <sys/types.h>;
#include <sys/socket.h>;
#include <sys/ioctl.h>;
#include <net/if.h>;
#include <net/if_arp.h>;
#include <net/ethernet.h>;
#include <signal.h>;
#include <netinet/ip.h>;
struct in_addr myself,mymask;
int fd_arp;
struct ifreq ifr;
main(int argc,char* argv[]) {
char device[32];
struct sockaddr from,to;
int fromlen;
struct sockaddr_in *sin_ptr;
u_char *ptr;
int n;
strcpy(device,"lo");
if((fd_arp=socket(AF_INET,SOCK_PACKET,htons(0x0806)))<0) {
perror("arp socket error");
exit(-1);
}
strcpy(ifr.ifr_name,device);
if(ioctl(fd_arp,SIOCGIFADDR,&ifr)<0) {
perror("ioctl SIOCGIFADDR error");
exit(-1);
}
sin_ptr=(struct sockaddr_in *)&ifr.ifr_addr;
myself=sin_ptr->;sin_addr;
// get network mask
if(ioctl(fd_arp,SIOCGIFNETMASK,&ifr)<0) {
perror("ioctl SIOCGIFNETMASK error");
exit(-1);
}
sin_ptr=(struct sockaddr_in *)&ifr.ifr_addr;
mymask=sin_ptr->;sin_addr;
// get mac address
if(ioctl(fd_arp,SIOCGIFHWADDR,&ifr)<0) {
perror("ioctl SIOCGIFHWADDR error");
exit(-1);
}
ptr=(u_char *)&ifr.ifr_ifru.ifru_hwaddr.sa_data[0];
printf("\nrequest mac %02x:%02x:%02x:%02x:%02x:%02x,",*ptr,*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),*(ptr+5));
printf("\nrequest netmask %s",inet_ntoa(mymask));
printf("\nrequest IP %s\n",inet_ntoa(myself));
} |
如何在FreeBSD下實現獲取MAC地址？謝謝
我這個好像更簡單：（linux 7.2上通過)#include <stdio.h>;
#include <string.h>;
#include <netdb.h>;
#include <arpa/inet.h>;
#include <netinet/in.h>;
#include <sys/types.h>;
#include <sys/socket.h>;
#include <sys/ioctl.h>;
#include <net/if.h>;
#include <net/if_arp.h>;
#include <net/ethernet.h>;
#include <signal.h>;
#include <netinet/ip.h>;
struct in_addr myself,mymask;
int fd_arp;
struct ifreq ifr;
main(int argc,char* argv[]) {
char device[32];
struct sockaddr from,to;
int fromlen;
struct sockaddr_in *sin_ptr;
u_char *ptr;
int n;
strcpy(device,"lo");
if((fd_arp=socket(AF_INET,SOCK_PACKET,htons(0x0806)))<0) {
perror("arp socket error");
exit(-1);
}
strcpy(ifr.ifr_name,device);
if(ioctl(fd_arp,SIOCGIFADDR,&ifr)<0) {
perror("ioctl SIOCGIFADDR error");
exit(-1);
}
sin_ptr=(struct sockaddr_in *)&ifr.ifr_addr;
myself=sin_ptr->;sin_addr;
// get network mask
if(ioctl(fd_arp,SIOCGIFNETMASK,&ifr)<0) {
perror("ioctl SIOCGIFNETMASK error");
exit(-1);
}
sin_ptr=(struct sockaddr_in *)&ifr.ifr_addr;
mymask=sin_ptr->;sin_addr;
// get mac address
if(ioctl(fd_arp,SIOCGIFHWADDR,&ifr)<0) {
perror("ioctl SIOCGIFHWADDR error");
exit(-1);
}
ptr=(u_char *)&ifr.ifr_ifru.ifru_hwaddr.sa_data[0];
printf("\nrequest mac %02x:%02x:%02x:%02x:%02x:%02x,",*ptr,*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),*(ptr+5));
printf("\nrequest netmask %s",inet_ntoa(mymask));
printf("\nrequest IP %s\n",inet_ntoa(myself));
} |
如何在FreeBSD下實現獲取MAC地址？謝謝
好東東！！！！ |
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