// DNS resource records
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#define T_A 1 // IPv4 address
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#define T_NS // Name Server
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#define T_CNAME 5 // Cannonical name
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#define T_SOA 6 // State of Authority
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#define T_PTR 12 // Domain name pointer
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#define T_MX 15 // Mail exchange
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void resolve(char* hostname, char* dns_ip, int query_type, int read);
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void print_packet(unsigned char* buf);
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void change_to_DNS_name_format(unsigned char* dns, unsigned char* host);
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char* read_name(unsigned char* reader, unsigned char* buffer, int* count);
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