NetLink ARP Table

#include <netinet/ip.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <syslog.h> #include <fcntl.h> #include <net/if_arp.h> #include <sys/socket.h> #include <
netinet/in.h> #include <string.h> #include <errno.h> #include <time.h> #include <sys/uio.h>     
#include <bits/sockaddr.h> #include <asm/types.h> #include <linux/rtnetlink.h> FILE *ip4to6;
Char Ipv4[inet_addrstrlen];
Char Ipv6[inet6_addrstrlen];

unsigned long long lladdr;
    int Injectmacipv4 () {int FD = socket (Pf_netlink, SOCK_DGRAM, Netlink_route);
    struct SOCKADDR_NL la;
    memset (&la, 0, sizeof (LA));
    la.nl_family = Af_netlink;
    La.nl_pad = 0;
    La.nl_pid = Getpid ();
    
    la.nl_groups = 0;

    Bind (FD, (struct sockaddr*) &la, sizeof (LA));
        struct {struct NLMSGHDR n;
        struct NDMSG R;
    Char buf[1024];
    } REQ2;
   memset (&req2, 0, sizeof (REQ2)); int ndmsglen = nlmsg_length (sizeof (struct ndmsg));
    Create the IP attribute struct rtattr *dstattr;
    dstattr = (struct rtattr *) req2.buf;
    Dstattr->rta_type = NDA_DST;
    Dstattr->rta_len = sizeof (struct rtattr) + 4;
    int intip;
    Inet_pton (Af_inet, IPv4, ((char *) dstattr) + sizeof (struct rtattr));

Ndmsglen + + dstattr->rta_len;
    Create the MAC attribute//struct rtattr *dstattr;
    dstattr = (struct rtattr *) Req2.buf + 2;
    Dstattr->rta_type = nda_lladdr;
    Dstattr->rta_len = sizeof (struct rtattr) + 6;
    memcpy ((char *) dstattr) + sizeof (struct rtattr), &lladdr, 6);

Ndmsglen + + dstattr->rta_len; Fill in the NetLink message header Req2.n.nlmsg_len = Ndmsglen;
    48;
    Req2.n.nlmsg_type = Rtm_newneigh; Req2.n.nlmsg_flags = nlm_f_request| nlm_f_create| NLM_F_EXCL;
    1537 Req2.n.nlmsg_seq;

Req2.n.nlmsg_pid;
    Fill in the NetLink message newneigh req2.r.ndm_family = af_inet; REQ2.R.Ndm_pad1;
    Req2.r.ndm_pad2; Req2.r.ndm_ifindex = 2;
    /sys/class/net/eth2/ifindex req2.r.ndm_state = nud_permanent;
    Req2.r.ndm_flags;

Req2.r.ndm_type;
    Debug stuff about the packet to be send via NetLink/* printf ("The Sent packet:\n\n"); printf ("nlmsg header:\nnlmsg_len =%i\nnlmsg_type =%i\nnlmsg_flags =%i\nnlmsg_seq =%i\nnlmsg_pid =%i\n\n", Req2.n.nlms
    G_len, Req2.n.nlmsg_type, Req2.n.nlmsg_flags, Req2.n.nlmsg_seq, req2.n.nlmsg_pid); printf ("nlmsg message:\nndm_family =%i\nndm_pad1 =%i\nndm_pad2 =%i\nndm_ifindex =%i\nndm_state =%i\nndm_flags =%i\nn Dm_type =%i\n\n ", req2.r.ndm_family, Req2.r.ndm_pad1, Req2.r.ndm_pad2, Req2.r.ndm_ifindex, Req2.r.ndm_state,
    Req2.r.ndm_flags, Req2.r.ndm_type);
    printf ("buf:\n");
    int bufteller = 0;
        while (Bufteller < 256) {printf ("%i", Req2.buf[bufteller]);
    bufteller++;
 printf ("\ n \ nthe");
    */int status2; Status2 = Send (FD, &AMP;REQ2, Req2.n.nlmsg_len, 0);
    Close (FD);
return 1;

    int Getmacipv6 () {int FD = socket (Pf_netlink, SOCK_DGRAM, Netlink_route);
    struct SOCKADDR_NL la;
    memset (&la, 0, sizeof (LA));
    la.nl_family = Af_netlink;
    La.nl_pad = 0;
    La.nl_pid = Getpid ();

    la.nl_groups = 0;

Bind (FD, (struct sockaddr*) &la, sizeof (LA));
        Send request via NetLink, the message was in req struct {struct NLMSGHDR n;
    struct NDMSG R;
    
    } req;
    memset (&req, 0, sizeof (req));
    Fill in the NetLink message header Req.n.nlmsg_len = nlmsg_length (sizeof (struct ndmsg));
    Req.n.nlmsg_type = Rtm_getneigh; Req.n.nlmsg_flags = Nlm_f_request |
    Nlm_f_dump;
    Req.n.nlmsg_seq;

    req.n.nlmsg_pid;//= Getpid ();
    Fill in the NetLink message getneigh req.r.ndm_family = Af_inet6;
    Req.r.ndm_pad1;
    Req.r.ndm_pad2;
    Req.r.ndm_ifindex;
    req.r.ndm_state;//= nud_permanent;
    Req.r.ndm_flags;

    Req.r.ndm_type;

    int status; Status = SEnd (FD, &req, Req.n.nlmsg_len, 0);

    if (Status < 0) printf ("RFC 5549:problem sending to netlink\n");
    Receive data and put it in buf char buf[256];
    Char *p;
    struct NLMSGHDR *nlp;
    memset (buf, 0, sizeof (BUF));
    p = buf;
    int NLL = 0;
    struct NDMSG *NDP;
    struct rtattr *ndap;
 
    int NDL;
            while (1) {status = recv (FD, p, sizeof (BUF)-NLL, 0);
            if (Status < 0) printf ("RFC 5549:problem receiving from netlink\n");
            
            Close (FD);
            NLP = (struct NLMSGHDR *) p;
            if (Nlp->nlmsg_type = = Nlmsg_done) {break;     while (1) {NDP = (struct ndmsg *) nlmsg_data (NLP);      Get Rtnetlink message header Ndap = (struct rtattr *) Rtm_rta (NDP);                         Get start of attributes Ndl = Rtm_payload (NLP);    
                    while (1) {if (Ndap->rta_type = = NDA_DST)
                            {char Dstp[inet6_addrstrlen];
                            memset (DSTP, 0, sizeof (DSTP));
                            Long Long *intippoint = Rta_data (NDAP);                          
                            
                            Long Long intip = *intippoint;
                            printf ("Intip =%lli\n", intip);                     
                            Inet_ntop (Af_inet6, Rta_data (NDAP), DSTP, Inet6_addrstrlen);
                            
                            printf ("DSTP =%s, IPv6 =%s\n", DSTP, IPv6);
                                if (strcmp (DSTP, ipv6) = = 0) {Ndap = Rta_next (Ndap, NDL);
                                Long Long *macpoint = Rta_data (NDAP);
           LLADDR = *macpoint;                     printf ("lladdr =%llx\n", lladdr);
                            return 2;
                        } NDAP = Rta_next (Ndap, NDL);
                        if (RTA_OK (Ndap, NDL)!= 1) {break;
                    }} p + = status;
                    NLL + = status;
                    NLP = Nlmsg_next (NLP, NLL);
                    if (NLMSG_OK (NLP, NLL)!= 1) {break;
}} return 1;
    int ReadFile (int teller) {ip4to6 = fopen ("/usr/local/sbin/ip4to6", "R");
    Char line[100];
        while (1) {int teller2 = 0;
                while (Teller2 <= Teller) {fgets (line, IP4TO6);
        teller2++; } Char *worD
        Word = Strtok (line, "");
        memcpy (IPv6, Word, inet6_addrstrlen);
        Word = Strtok (NULL, "");    Word[strlen (Word)-1] = Word[strlen (word)];
        Remove the last \ IPv4 address memcpy (IPv4, Word, inet_addrstrlen);
    Break
    } fclose (IP4TO6);
return 1;
    int Countlines () {ip4to6 = fopen ("/usr/local/sbin/ip4to6", "R");
    char c;
    int teller = 0;
        while ((c = fgetc (IP4TO6))!= EOF) {if (c = = ' \ n ') {teller++;
    } fclose (IP4TO6);
return teller;
        void Main () {while (1) {int lines = Countlines ();
        int teller = 0;
            while (Teller < lines) {lladdr = 0;
            ReadFile (Teller);
           Getmacipv6 ();
            printf ("\ n");
            if (lladdr!= 0) {Injectmacipv4 ();
        } teller++;
    Sleep (5); }
}