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authorAnton Luka Šijanec <anton@sijanec.eu>2023-08-03 23:50:57 +0200
committerAnton Luka Šijanec <anton@sijanec.eu>2023-08-03 23:50:57 +0200
commitceb5cf3200245cc9b5686dc5a4540de7417e85b8 (patch)
tree132e13b0ef9d983c21ccd2524ddd3ad25fcfc5ea /skripti
parentne vem če je to prav ampak izgledalo je kot bug??????? (diff)
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Diffstat (limited to 'skripti')
-rw-r--r--skripti/raw6.c153
1 files changed, 153 insertions, 0 deletions
diff --git a/skripti/raw6.c b/skripti/raw6.c
new file mode 100644
index 0000000..c0fb130
--- /dev/null
+++ b/skripti/raw6.c
@@ -0,0 +1,153 @@
+#define _GNU_SOURCE
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/ip6.h>
+#include <netinet/udp.h>
+#include <stdio.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <signal.h>
+#include <linux/if_packet.h>
+#include <net/ethernet.h>
+#include <net/if.h>
+#include <stdlib.h>
+#include <arpa/nameser.h>
+#include <assert.h>
+#include "/root/projects/dnsfind/domain2name.c"
+int hex2int (char hex) {
+ if (hex >= '0' && hex <= '9')
+ return hex-'0';
+ if (hex >= 'a' && hex <= 'f')
+ return 10+hex-'a';
+ if (hex >= 'A' && hex <= 'A')
+ return 10+hex-'A';
+ return -1;
+}
+int mac_pton (const char * src, unsigned char * dst) {
+ for (int i = 0; i < 6; i++) {
+ if (hex2int(src[0]) == -1 || hex2int(src[1]) == -1)
+ return 0;
+ dst[i] = hex2int(src[0]) << 4 | hex2int(src[1]);
+ src += 3;
+ }
+ return 1;
+}
+unsigned long checksum (void * data, int len) { // i cant into checksums im retarded
+ unsigned sum = 0;
+ for (int i = 0; i+1 < len; i += 2)
+ sum += *((unsigned char *) data + i)*256+*((unsigned char *) data + i + 1);
+ if (len % 2)
+ sum += ((unsigned char *) data)[len-1];
+ return sum;
+}
+uint16_t checksum_final (unsigned long sum) {
+ sum += sum >> 16;
+ sum &= 0xffff;
+ sum ^= 0xffff;
+ if (sum == 0)
+ sum = 0xffff;
+ return htons(sum);
+}
+int main (int argc, char ** argv) {
+ if (argc != 5) {
+ fprintf(stderr, "%s <dst ipv6> <src ipv6> <if index> <router mac> <querydomain>\n", argv[0]);
+ return 4;
+ }
+ int sock = socket(AF_PACKET, SOCK_DGRAM, htons(ETHERTYPE_IPV6));
+ if (sock == -1) {
+ perror("socket(AF_PACKET, SOCK_DGRAM, htons(ETHERTYPE_IPV6)");
+ return 1;
+ }
+ HEADER dns = {
+ .id = htons(0x1337),
+ .qr = 0, // question
+ .opcode = ns_o_query,
+ .rd = 1, // recursion
+ .qdcount = htons(1)
+ };
+ unsigned char question[5] = "";
+ *((uint16_t *) (question+1)) = htons(ns_t_any);
+ *((uint16_t *) (question+3)) = htons(ns_c_in);
+ struct udphdr udp = {
+ .source = htons(6969),
+ .dest = htons(53),
+ .len = htons(8+sizeof dns+sizeof question)
+ };
+ struct ip6_hdr ip6 = {
+ .ip6_ctlun.ip6_un1.ip6_un1_plen = udp.len,
+ .ip6_ctlun.ip6_un1.ip6_un1_hlim = 255,
+ .ip6_ctlun.ip6_un1.ip6_un1_nxt = IPPROTO_UDP
+ };
+ ip6.ip6_ctlun.ip6_un2_vfc |= 0x60;
+ switch (inet_pton(AF_INET6, argv[1], ip6.ip6_dst.s6_addr)) {
+ case -1:
+ perror("inet_pton(AF_INET6, argv[1])");
+ return 2;
+ break;
+ case 0:
+ fprintf(stderr, "naslov %s ni veljaven\n", argv[1]);
+ return 12;
+ break;
+ }
+ switch (inet_pton(AF_INET6, argv[2], ip6.ip6_src.s6_addr)) {
+ case -1:
+ perror("inet_pton(AF_INET6, argv[2])");
+ return 9;
+ break;
+ case 0:
+ fprintf(stderr, "naslov %s ni veljaven\n", argv[1]);
+ return 11;
+ break;
+ }
+ struct iovec msg[] = {
+ {
+ .iov_base = &ip6,
+ .iov_len = sizeof ip6
+ },
+ {
+ .iov_base = &udp,
+ .iov_len = sizeof udp
+ },
+ {
+ .iov_base = &dns,
+ .iov_len = sizeof dns
+ },
+ {
+ .iov_base = &question,
+ .iov_len = sizeof question
+ }
+ };
+ unsigned long sum = ip6.ip6_ctlun.ip6_un1.ip6_un1_nxt + checksum(&ip6.ip6_ctlun.ip6_un1.ip6_un1_plen, sizeof(uint16_t)) + checksum(&ip6.ip6_src, sizeof ip6.ip6_src) + checksum(&ip6.ip6_dst, sizeof ip6.ip6_dst);
+ for (size_t i = 1; i < sizeof msg/sizeof msg[0]; i++)
+ sum += checksum(msg[i].iov_base, msg[i].iov_len);
+ udp.check = checksum_final(sum);
+ udp.check = 0;
+ int ifindex = atoi(argv[3]);
+ struct sockaddr_ll dst = {
+ .sll_family = AF_PACKET,
+ .sll_ifindex = ifindex,
+ .sll_halen = 6,
+ .sll_protocol = htons(ETHERTYPE_IPV6)
+ };
+ if (!mac_pton(argv[4], dst.sll_addr)) {
+ fprintf(stderr, "naslov %s ni veljaven\n", argv[4]);
+ return 13;
+ }
+ struct mmsghdr mmsghdr = {
+ .msg_hdr = {
+ .msg_name = &dst,
+ .msg_namelen = sizeof dst,
+ .msg_iov = msg,
+ .msg_iovlen = sizeof msg / sizeof msg[0]
+ }
+ };
+ /* if (sendmmsg(sock, &mmsghdr, 1, 0) == -1) {
+ perror("sendmmsg(sock, &mmsghdr, 1, 0)");
+ return 3;
+ } */
+ if (sendmsg(sock, &mmsghdr.msg_hdr, 0) == -1) {
+ perror("sendmsg");
+ return 5;
+ }
+ return 0;
+}