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#include <stdio.h>
#include <string.h>
#include <time.h>
#include <arpa/inet.h>
#include <pcap/pcap.h>
#include <assert.h>
#include <MESA/stream.h>
#include <MESA/dns.h>
#define LOG_PATH "./log/dns/"
//#define DEBUG 1
int rr_print(dns_info_t *dns_info, struct streaminfo *a_udp, int thread_seq, void *a_packet, int *dns_sec)
{
int i = 0, j = 0;
int used_len = 0, len = 0;
FILE *fp = NULL;
char filename[256];
char dns_header[256];
char question[1024];
char rr_buf[4096];
char ip_str[128];
char tmp_buf[2048];
char maps[2048];
char salt_value[2048];
dns_rr_t *dns_rr = NULL;
char *buf = NULL;
int buflen = sizeof(rr_buf);
buf = rr_buf;
memset(filename, 0 , sizeof(filename));
memset(dns_header, 0 , sizeof(dns_header));
snprintf(filename, sizeof(filename), "%s%s", (char *)LOG_PATH, printaddr(&a_udp->addr, thread_seq));
fp = fopen(filename, "a+");
if(fp == NULL)
{
return 0;
}
used_len = snprintf(dns_header, sizeof(dns_header),
"hdr_info: <id=0X%02x, QR=%d, OPCODE=%d, AA=%d, TC=%d, RD=%d, RA=%d,Z=%d, RCODE=%d, qdcount=%d, ancount=%d, aucount=%d, adcount=%d>\n",
dns_info->hdr_info.id,
dns_info->hdr_info.qr,
dns_info->hdr_info.opcode,
dns_info->hdr_info.aa,
dns_info->hdr_info.tc,
dns_info->hdr_info.rd,
dns_info->hdr_info.ra,
dns_info->hdr_info.z,
dns_info->hdr_info.rcode,
dns_info->hdr_info.qdcount,
dns_info->hdr_info.ancount,
dns_info->hdr_info.aucount,
dns_info->hdr_info.adcount);
fwrite(dns_header, used_len, 1, fp);
for(i = 0; i < dns_info->hdr_info.qdcount && (&dns_info->query_question[i])!=NULL; i++)
{
used_len = snprintf(question, sizeof(question), "question: <qtype: %d, qclass: %d, qname: %s>\n",
dns_info->query_question[i].qtype,
dns_info->query_question[i].qclass,
dns_info->query_question[i].qname);
}
fwrite(question, used_len, 1, fp);
used_len = snprintf(rr_buf, sizeof(rr_buf), "RRS count: %d\n", dns_info->rr_count);
fwrite(rr_buf, used_len, 1, fp);
for(i = 0; i < dns_info->rr_count; i++)
{
used_len = 0;
dns_rr = &(dns_info->rr[i]);
memset(rr_buf, 0 , sizeof(rr_buf));
if(dns_rr->type == DNS_TYPE_OPT)
{
used_len += snprintf(rr_buf, sizeof(rr_buf), "RRS%d OPT <name: %s, type: %d, udp_payload: %d, extended RCODE: %d, version: %d, Z; 0X%x, rdlength: %d>\n",
i,
dns_rr->name,
dns_rr->type,
dns_rr->rr_class,
dns_rr->ttl >> 24,
(dns_rr->ttl>>16)&0xFF,
dns_rr->ttl&&0xFFFF,
dns_rr->rdlength);
}
else
{
used_len += snprintf(rr_buf, sizeof(rr_buf), "RRS%d <name: %s, type: %d, rr_class: %d, ttl: %d, rdlength: %d>",
i,
dns_rr->name,
dns_rr->type,
dns_rr->rr_class,
dns_rr->ttl,
dns_rr->rdlength);
}
switch(dns_rr->type)
{
case DNS_TYPE_A:
inet_ntop(AF_INET, (void *)(dns_rr->rdata.a), ip_str, sizeof(ip_str));
used_len += snprintf(buf+used_len, buflen-used_len, "[A: %s]\n", ip_str);
break;
case DNS_TYPE_NS:
used_len += snprintf(buf+used_len, buflen-used_len, "[NS: %s]\n", dns_rr->rdata.ns);
break;
case DNS_TYPE_MD:
used_len += snprintf(buf+used_len, buflen-used_len, "[MD: %s]\n", dns_rr->rdata.md);
break;
case DNS_TYPE_MF:
used_len += snprintf(buf+used_len, buflen-used_len, "[MF: %s]\n", dns_rr->rdata.mf);
break;
case DNS_TYPE_CNAME:
used_len += snprintf(buf+used_len, buflen-used_len, "[CNAME: %s]\n", dns_rr->rdata.cname);
break;
case DNS_TYPE_SOA:
used_len += snprintf(buf+used_len, buflen-used_len,
"[SOA mname: %s, rname: %s, serial: %u, refresh: %u, retry: %u, expire: %u, minimum: %u]\n",
dns_rr->rdata.soa->mname,
dns_rr->rdata.soa->rname,
dns_rr->rdata.soa->serial,
dns_rr->rdata.soa->refresh,
dns_rr->rdata.soa->retry,
dns_rr->rdata.soa->expire,
dns_rr->rdata.soa->minimum);
break;
case DNS_TYPE_MB:
used_len += snprintf(buf+used_len, buflen-used_len, "[MB: %s]\n", dns_rr->rdata.mb);
break;
case DNS_TYPE_MG:
used_len += snprintf(buf+used_len, buflen-used_len, "[MG: %s]\n", dns_rr->rdata.mg);
break;
case DNS_TYPE_MR:
used_len += snprintf(buf+used_len, buflen-used_len, "[MR: %s]\n", dns_rr->rdata.mr);
break;
case DNS_TYPE_NULL:
used_len += snprintf(buf+used_len, buflen-used_len, "[null size: %u, null: %s]\n",
dns_rr->rdata.null->size, dns_rr->rdata.null->null);
break;
case DNS_TYPE_WKS:
inet_ntop(AF_INET, &(dns_rr->rdata.wks->addr), ip_str, sizeof(ip_str));
used_len += snprintf(buf+used_len, buflen-used_len, "[WKS addr: %s, protocol: %u, bitmap: %s, size: %u]\n",
ip_str, dns_rr->rdata.wks->protocol, dns_rr->rdata.wks->bitmap, dns_rr->rdata.wks->size);
break;
case DNS_TYPE_PTR:
used_len += snprintf(buf+used_len, buflen-used_len, "[PTR: %s]\n", dns_rr->rdata.ptr);
break;
case DNS_TYPE_HINFO:
used_len += snprintf(buf+used_len, buflen-used_len, "[HINFO cpu: %s, os: %s]\n",
dns_rr->rdata.hinfo->cpu, dns_rr->rdata.hinfo->os);
break;
case DNS_TYPE_MINFO:
used_len += snprintf(buf+used_len, buflen-used_len, "[MINFO rmailbx: %s, emailbx: %s]\n",
dns_rr->rdata.minfo->rmailbx, dns_rr->rdata.minfo->emailbx);
break;
case DNS_TYPE_MX:
used_len += snprintf(buf+used_len, buflen-used_len, "[MX preference: %u, exchange: %s]\n",
dns_rr->rdata.mx->preference, dns_rr->rdata.mx->exchange);
break;
case DNS_TYPE_TXT:
used_len += snprintf(buf+used_len, buflen-used_len, "[TXT size: %u, txt: %s]\n",
dns_rr->rdata.txt->size, dns_rr->rdata.txt->txt);
break;
case DNS_TYPE_RP:
used_len += snprintf(buf+used_len, buflen-used_len, "[mailbox: %s, txt_rr: %s]\n",
dns_rr->rdata.rp->mailbox, dns_rr->rdata.rp->txt_rr);
break;
case DNS_TYPE_AAAA:
inet_ntop(AF_INET6, dns_rr->rdata.aaaa, ip_str, sizeof(ip_str));
used_len += snprintf(buf+used_len, buflen-used_len, "[AAAA: %s]\n", ip_str);
break;
case DNS_TYPE_OPT:
break;
case DNS_TYPE_DS:
*dns_sec = 2;
len = 0;
assert(dns_rr->rdata.ds->digest_len*2<sizeof(tmp_buf));
for(j = 0; j < (int)(dns_rr->rdata.ds->digest_len); j++)
{
len += snprintf(tmp_buf+len, sizeof(tmp_buf)-len, "%02x", dns_rr->rdata.ds->digest[j]);
}
used_len += snprintf(buf+used_len, buflen-used_len,
"[DS key_tag: %u, algo: %u, digest_type: %u, digest: %s]\n",
dns_rr->rdata.ds->key_tag, dns_rr->rdata.ds->algo,
dns_rr->rdata.ds->digest_type, tmp_buf);
break;
case DNS_TYPE_RRSIG:
*dns_sec = 2;
len = 0;
assert(dns_rr->rdata.rrsig->signature_len*2<sizeof(tmp_buf));
for(j = 0; j < (int)(dns_rr->rdata.rrsig->signature_len); j++)
{
len += snprintf(tmp_buf+len, sizeof(tmp_buf)-len, "%02x", dns_rr->rdata.rrsig->signature[j]);
}
used_len += snprintf(buf+used_len, buflen-used_len,
"[RRSIG type_covered: %u, algo: %u, labels: %u, original_ttl: %u, sig_expiration: %u, sig_inception: %u, key_tag: %u, signer_name: %s, signature: %s]\n",
dns_rr->rdata.rrsig->type_covered, dns_rr->rdata.rrsig->algo,
dns_rr->rdata.rrsig->labels, dns_rr->rdata.rrsig->original_ttl,
dns_rr->rdata.rrsig->sig_expiration, dns_rr->rdata.rrsig->sig_inception,
dns_rr->rdata.rrsig->key_tag, dns_rr->rdata.rrsig->signer_name, tmp_buf);
break;
case DNS_TYPE_NSEC:
*dns_sec = 2;
len = 0;
for(j = 0; j < (int)(dns_rr->rdata.nsec->maps_len); j++)
{
len += snprintf(maps+len, sizeof(maps)-len, "%02x", dns_rr->rdata.nsec->type_bit_maps[j]);
}
used_len += snprintf(buf+used_len, buflen-used_len, "[NSEC next_domain: %s, type_bit_maps: %s]\n", dns_rr->rdata.nsec->next_domain, maps);
break;
case DNS_TYPE_DNSKEY:
*dns_sec = 2;
len = 0;
assert(dns_rr->rdata.dnskey->public_key_len*2<sizeof(tmp_buf));
for(j = 0; j < (int)(dns_rr->rdata.dnskey->public_key_len); j++)
{
len += snprintf(tmp_buf+len, sizeof(tmp_buf)-len, "%02x", dns_rr->rdata.dnskey->public_key[j]);
}
used_len += snprintf(buf+used_len, buflen-used_len, "[DNSKEY flags: %u, protocol: %u, algo: %u, public_key: %s]\n",
dns_rr->rdata.dnskey->flags, dns_rr->rdata.dnskey->protocol, dns_rr->rdata.dnskey->algo, tmp_buf);
break;
case DNS_TYPE_NSEC3:
*dns_sec = 2;
memset(tmp_buf, 0, sizeof(tmp_buf));
memset(maps, 0, sizeof(maps));
len = 0;
assert(dns_rr->rdata.nsec3->hash_len*2<sizeof(tmp_buf));
for(j = 0; j < (int)(dns_rr->rdata.nsec3->hash_len); j++)
{
len += snprintf(tmp_buf+len, sizeof(tmp_buf)-len, "%02x", dns_rr->rdata.nsec3->next_hash_owner[j]);
}
len = 0;
for(j = 0; j < (int)(dns_rr->rdata.nsec3->maps_len); j++)
{
len += snprintf(maps+len, sizeof(maps)-len, "%02x", dns_rr->rdata.nsec3->type_bit_maps[j]);
}
len = 0;
for(j = 0; j < (int)(dns_rr->rdata.nsec3->salt_len); j++)
{
len += snprintf(salt_value+len, sizeof(salt_value)-len, "%02x", dns_rr->rdata.nsec3->salt_value[j]);
}
used_len += snprintf(buf+used_len, buflen-used_len,
"[NSEC3 hash_algo: %u, flags: %u, iteration: %u, salt_len: %u, hash_len: %u, salt_value: %s, next_hash_owner: %s, type_bit_maps: %s]\n",
dns_rr->rdata.nsec3->hash_algo, dns_rr->rdata.nsec3->flags,
dns_rr->rdata.nsec3->iteration, dns_rr->rdata.nsec3->salt_len,
dns_rr->rdata.nsec3->hash_len, salt_value, tmp_buf, maps);
break;
case DNS_TYPE_NSEC3PARAM:
len = 0;
assert(dns_rr->rdata.nsec3param->salt_len*2<sizeof(tmp_buf));
for(j = 0; j < (int)(dns_rr->rdata.nsec3param->salt_len); j++)
{
len += snprintf(tmp_buf+len, sizeof(tmp_buf)-len, "%02x", dns_rr->rdata.nsec3param->salt_value[j]);
}
used_len += snprintf(buf+used_len, buflen-used_len,
"[NSEC3PARAM hash_algo: %u, flags: %u, iteration: %u, salt_len: %u, salt_value: %s]\n",
dns_rr->rdata.nsec3param->hash_algo, dns_rr->rdata.nsec3param->flags,
dns_rr->rdata.nsec3param->iteration, dns_rr->rdata.nsec3param->salt_len,
tmp_buf);
break;
case DNS_TYPE_UNKNOWN:
used_len += snprintf(buf+used_len, buflen-used_len, "[data: %s]\n", dns_rr->rdata.unknown_data);
break;
case DNS_QTYPE_AXFR:
continue;
break;
case DNS_QTYPE_MAILB:
continue;
break;
case DNS_QTYPE_MAILA:
continue;
break;
case DNS_QTYPE_ANY:
continue;
break;
default:
continue;
break;
}
fwrite(buf, used_len, 1, fp);
}
fclose(fp);
fp = NULL;
return 0;
}
char dns_test_entry (stSessionInfo *session_info, void **pme, int thread_seq, struct streaminfo *a_udp, void *a_packet)
{
int dns_sec = 0;
dns_info_t *dns_info = (dns_info_t *)session_info->app_info;
if(dns_info!= NULL)
{
#ifdef DEBUG
rr_print(dns_info, a_udp, thread_seq, a_packet, &dns_sec);
#endif
}
return PROT_STATE_GIVEME;
}
char dns_build_cheat_pkt_entry (stSessionInfo *session_info, void **pme, int thread_seq, struct streaminfo *a_udp, void *a_packet)
{
unsigned char payload[4096] = {0};
int payload_len = sizeof(payload);
cheat_pkt_opt_t cheat_opt;
int cheat_opt_num = 0;
unsigned char senddir = 0;
char *cheat_ipv6 = "11:22:33:44:55::66";
dns_hdr_t *dns_hdr = NULL;
dns_info_t *dns_info = (dns_info_t *)session_info->app_info;
memset(payload, 0, payload_len);
dns_hdr = (dns_hdr_t *)payload;
if(dns_info!= NULL)
{
switch(dns_info->query_question->qtype)
{
case DNS_TYPE_A:
cheat_opt.res_type = DNS_TYPE_A;
cheat_opt.res_len = 4;
*(unsigned int *)cheat_opt.res_info = 3825598474;
cheat_opt_num = 1;
dns_hdr->ancount = 1;
dns_hdr->id = dns_info->hdr_info.id;
dns_hdr->qdcount = 1;
break;
case DNS_TYPE_AAAA:
cheat_opt.res_type = DNS_TYPE_AAAA;
cheat_opt.res_len = 16;
inet_pton(AF_INET6, cheat_ipv6, cheat_opt.res_info);
cheat_opt_num = 1;
dns_hdr->ancount = 1;
dns_hdr->id = dns_info->hdr_info.id;
dns_hdr->qdcount = 1;
break;
}
payload_len = build_cheat_pkt(payload, payload_len, dns_info->query_question, &cheat_opt, cheat_opt_num);
senddir = (a_udp->routedir)^1;
MESA_inject_pkt(a_udp, (const char *)payload, payload_len, (const char *)a_packet, senddir);
}
return PROT_STATE_DROPME;
}
int dns_test_init()
{
return 0;
}
void dns_test_destory()
{
}
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