linux下用C实现arp包的发送

瀚海书香

那位大虾有C实现的arp包的发送代码，拿出来学习一下吧。小弟不胜感激

wojiaohesen

能详细的说说你要什么功能吗？？

瀚海书香

谢谢啊
小弟已经通过libnet实现了，呵呵
顺便把代码贴出来吧
#include <libnet.h>
#include <stdlib.h>
int main()
{
        u_char *name="192.168.0.1";
        u_long dst_ip=0,src_ip=0;
        libnet_t *l;
        libnet_ptag_t t;
        u_char enet_src[6]={0x00,0x16,0x36,0x5a,0x31,0x91};
        u_char enet_dst[6]={0xff,0xff,0xff,0xff,0xff,0xff};
        u_char ip_dst[4]={0xc0,0xa8,0x00,0x01};
        u_long i;
        char *device=NULL;
        char errbuf[LIBNET_ERRBUF_SIZE];
        l=libnet_init(LIBNET_LINK_ADV,device,errbuf);
        if(l==NULL)
        {
                fprintf(stderr,"libnet_init() failed %s\n",errbuf);
                exit(0);
        }
        i=libnet_get_ipaddr4(l);
    t=libnet_build_arp(ARPHRD_ETHER,ETHERTYPE_IP,6,4,ARPOP_REQUEST,enet_src,        (u_int32_t*)&i,enet_dst,ip_dst,NULL,0,l,0);
        t=libnet_autobuild_ethernet(enet_dst,ETHERTYPE_ARP,l);
        libnet_write(l);
        libnet_destroy(l);
}

dreamice

不错，值得学习

flb_2001

能讲解一下吗？

coolv

有没有ARP防御的源代码啊？

coolv

好似运行不了啊

rmqh

#include <stdio.h> #include <stdlib.h> #define _GNU_SOURCE #include <string.h> #include <sys/socket.h> #include <linux/sockios.h> #include <arpa/inet.h> #include <net/if.h> #include <netinet/ether.h> #include <netpacket/packet.h> int main() {     struct ifreq ifr;     int fd = 0;     const char *device = "eth0";     char *source = "10.0.1.1";     char *target = "10.0.1.2";     unsigned char buf[256];     struct arphdr *ah = (struct arphdr *) buf;     unsigned char *p = (unsigned char *) (ah + 1);     struct in_addr src;     struct in_addr dst;     struct sockaddr_ll me;     struct sockaddr_ll he;     fd = socket(AF_PACKET, SOCK_DGRAM, 0);     if (fd < 0)         goto exit;         memset(&ifr, 0, sizeof(ifr));     strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name) - 1);     if (ioctl(fd, SIOCGIFINDEX, &ifr))         goto exit;     memset(&me, 0, sizeof(me));     me.sll_ifindex = ifr.ifr_ifindex;     me.sll_family = AF_PACKET;     me.sll_protocol = htons(ETH_P_ARP);     if (bind(fd, (struct sockaddr *)&me, sizeof(me)))         goto exit;     socklen_t alen = sizeof(me);     if (getsockname(fd, (struct sockaddr *) &me, &alen))         goto exit;     he = me;     memset(he.sll_addr, -1, he.sll_halen);     inet_aton(source, &src);     inet_aton(target, &dst);     ah->ar_hrd = htons(ARPHRD_ETHER);     ah->ar_pro = htons(ETH_P_IP);     ah->ar_hln = me.sll_halen;     ah->ar_pln = 4;     ah->ar_op = htons(ARPOP_REQUEST);     p = mempcpy(p, me.sll_addr, ah->ar_hln);     p = mempcpy(p, &src, 4);     p = mempcpy(p, he.sll_addr, ah->ar_hln);     p = mempcpy(p, &dst, 4);     sendto(fd, buf, p - buf, 0, (struct sockaddr *)&he, sizeof(he));     exit:     if (fd > 0)         close(fd);     return 0; }