| | |
| | | #include <arpa/inet.h> |
| | | //#include <netint/in.h> |
| | | //#include <netdb.h> |
| | | #include <sys/time.h> |
| | | //#include <sys/time.h> |
| | | #include <unistd.h> |
| | | #include "dns.h" |
| | | |
| | |
| | | struct RES_RECORD |
| | | { |
| | | unsigned char* name; |
| | | struct R_DATA* resource; |
| | | struct R_DATA resource; |
| | | unsigned char* rdata; |
| | | }; |
| | | |
| | |
| | | reader = &buf[sizeof(struct DNS_HEADER)+strlen((const char*)qname)+1+sizeof(struct QUESTION)]; |
| | | printf("Response contains %d Qs, %d ans, %d auth serv, %d add reconds\n", ntohs(dns->q_count), ntohs(dns->ans_count), ntohs(dns->auth_count), ntohs(dns->add_count)); |
| | | stop = 0; |
| | | |
| | | //read answers |
| | | for (i = 0; i < ntohs(dns->ans_count); i++) { |
| | | answers[i].name = read_name(reader, buf, &stop); |
| | | reader = reader + stop; |
| | | answers[i].resource = (struct R_DATA*)reader; |
| | | memcpy(&(answers[i].resource), reader, sizeof(struct R_DATA)); |
| | | reader = reader+sizeof(struct R_DATA); |
| | | |
| | | if (ntohs(answers[i].resource->type) == T_A) { //IPv4 address |
| | | answers[i].rdata = (unsigned char*)malloc(ntohs(answers[i].resource->data_len)); |
| | | for (j = 0; j < ntohs(answers[i].resource->data_len); j++) { |
| | | |
| | | if (ntohs(answers[i].resource.type) == T_A) { //IPv4 address |
| | | answers[i].rdata = (unsigned char*)malloc(ntohs(answers[i].resource.data_len)); |
| | | for (j = 0; j < ntohs(answers[i].resource.data_len); j++) { |
| | | answers[i].rdata[j] = reader[j]; |
| | | } |
| | | answers[i].rdata[ntohs(answers[i].resource->data_len)] = '\0'; |
| | | reader = reader + ntohs(answers[i].resource->data_len); |
| | | answers[i].rdata[ntohs(answers[i].resource.data_len)] = '\0'; |
| | | reader = reader + ntohs(answers[i].resource.data_len); |
| | | } else { |
| | | answers[i].rdata = read_name(reader, buf, &stop); |
| | | reader = reader + stop; |
| | | } |
| | | } |
| | | |
| | | |
| | | //read authorities |
| | | for (i = 0; i < ntohs(dns->auth_count); i++) { |
| | | auth[i].name = read_name(reader, buf, &stop); |
| | | reader += stop; |
| | | auth[i].resource = (struct R_DATA*)reader; |
| | | memcpy(&(auth[i].resource), reader, sizeof(struct R_DATA)); |
| | | reader += sizeof(struct R_DATA); |
| | | auth[i].rdata = read_name(reader, buf, &stop); |
| | | reader += stop; |
| | | } |
| | | |
| | | |
| | | //read additional |
| | | for (i = 0; i < ntohs(dns->add_count); i++) { |
| | | addit[i].name = read_name(reader, buf, &stop); |
| | | reader += stop; |
| | | addit[i].resource = (struct R_DATA*)reader; |
| | | memcpy(&(addit[i].resource), reader, sizeof(struct R_DATA)); |
| | | reader += sizeof(struct R_DATA); |
| | | |
| | | if (ntohs(addit[i].resource->type) == 1) { |
| | | addit[i].rdata = malloc(ntohs(addit[i].resource->data_len)); |
| | | for (j = 0; j < ntohs(addit[i].resource->data_len); j++) |
| | | if (ntohs(addit[i].resource.type) == 1) { |
| | | addit[i].rdata = malloc(ntohs(addit[i].resource.data_len)); |
| | | for (j = 0; j < ntohs(addit[i].resource.data_len); j++) |
| | | addit[i].rdata[j] = reader[j]; |
| | | |
| | | addit[i].rdata[ntohs(addit[i].resource->data_len)] = '\0'; |
| | | reader += ntohs(addit[i].resource->data_len); |
| | | addit[i].rdata[ntohs(addit[i].resource.data_len)] = '\0'; |
| | | reader += ntohs(addit[i].resource.data_len); |
| | | } else { |
| | | addit[i].rdata = read_name(reader, buf, &stop); |
| | | reader += stop; |
| | | } |
| | | } |
| | | |
| | | |
| | | //print answers |
| | | printf("ans recs: %d\n", ntohs(dns->ans_count)); |
| | | for (i = 0; i < ntohs(dns->ans_count); i++) { |
| | | printf("name: %s ", answers[i].name); |
| | | if (ntohs(answers[i].resource->type) == T_A) { //IPv4 |
| | | if (ntohs(answers[i].resource.type) == T_A) { //IPv4 |
| | | long* p; |
| | | p = (long*)answers[i].rdata; |
| | | a.sin_addr.s_addr=(*p); |
| | | printf("has IPv4 addresss: %s", inet_ntoa(a.sin_addr)); |
| | | } else if (ntohs(answers[i].resource->type) == T_CNAME) { //CNAME |
| | | } else if (ntohs(answers[i].resource.type) == T_CNAME) { //CNAME |
| | | printf("has alias: %s", answers[i].rdata); |
| | | } |
| | | free(answers[i].rdata); |
| | | putc('\n', stdout); |
| | | } |
| | | |
| | |
| | | printf("Auth recs: %d\n", ntohs(dns->auth_count)); |
| | | for (i = 0; i < ntohs(dns->auth_count); i++) { |
| | | printf("name: %s ", addit[i].name); |
| | | if (ntohs(addit[i].resource->type) == 1) { |
| | | if (ntohs(addit[i].resource.type) == 1) { |
| | | long* p; |
| | | p = (long*)addit[i].rdata; |
| | | a.sin_addr.s_addr = *p; |
| | | printf("has IPv4 address: %s", inet_ntoa(a.sin_addr)); |
| | | } |
| | | free(auth[i].rdata); |
| | | putc('\n', stdout); |
| | | } |
| | | } |