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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
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#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout, ferror() */
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#include <stdint.h> /* uint16_t, uint32_t */
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <stdlib.h> /* free() */
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#include <stdbool.h> /* bool, true */
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#include <string.h> /* memset(), strcmp(), strlen, strerror() */
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#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6, SOCK_STREAM, INET6_ADDRSTRLEN */
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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struct in6_addr, inet_pton(),
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#include <assert.h>
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#include <errno.h> /* perror() */
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#include <net/if.h> /* if_nametoindex */
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#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
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if_nametoindex(), IF_NAMESIZE */
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#include <unistd.h> /* close(), SEEK_SET, off_t, write()*/
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#include <avahi-core/core.h>
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#include <avahi-core/lookup.h>
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#include <avahi-core/log.h>
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#include <avahi-common/simple-watch.h>
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#include <avahi-common/malloc.h>
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#include <avahi-common/error.h>
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/* Mandos client part */
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#include <sys/types.h> /* socket(), inet_pton() */
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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struct in6_addr, inet_pton() */
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#include <gnutls/gnutls.h> /* All GnuTLS stuff */
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#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
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#include <unistd.h> /* close() */
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#include <netinet/in.h>
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#include <arpa/inet.h> /* inet_pton(), htons */
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#include <stdbool.h> /* true */
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#include <string.h> /* memset */
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#include <arpa/inet.h> /* inet_pton() */
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#include <iso646.h> /* not */
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#include <net/if.h> /* IF_NAMESIZE */
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#include <argp.h> /* struct argp_option,
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struct argp_state, struct argp,
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#include <avahi-core/core.h> /* AvahiSimplePoll, AvahiServer,
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#include <avahi-core/lookup.h>
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#include <avahi-core/log.h> /* AvahiLogLevel */
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#include <avahi-common/simple-watch.h>
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#include <avahi-common/malloc.h>
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#include <avahi-common/error.h>
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#include <gnutls/gnutls.h> /* gnutls_certificate_credentials_t,
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gnutls_global_set_log_level(),
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gnutls_global_set_log_function(),
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gnutls_certificate_allocate_credentials(),
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gnutls_global_deinit(),
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gnutls_dh_params_init(),
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gnutls_dh_params_generate(),
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gnutls_certificate_set_dh_params(),
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gnutls_certificate_free_credentials(),
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gnutls_session_t, gnutls_init(),
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gnutls_priority_set_direct(),
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gnutls_credentials_set(),
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gnutls_certificate_server_set_request(),
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gnutls_dh_set_prime_bits(),
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gnutls_transport_set_ptr(),
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gnutls_transport_ptr_t,
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gnutls_perror(), gnutls_bye(),
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init_gnutls_session(),
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GNUTLS_CRD_CERTIFICATE,
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GNUTLS_E_INTERRUPTED,
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GNUTLS_E_REHANDSHAKE,
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#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
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GNUTLS_OPENPGP_FMT_BASE64 */
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#include <gpgme.h> /* gpgme_data_t, gpgme_ctx_t,
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gpgme_error_t, gpgme_engine_info_t,
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gpgme_check_version(),
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gpgme_engine_check_version(),
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gpgme_get_engine_info(),
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gpgme_set_engine_info(),
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gpgme_data_new_from_mem(),
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gpgme_data_new(), gpgme_new(),
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gpgme_decrypt_result_t,
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gpgme_op_decrypt_result(),
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gpgme_pubkey_algo_name(),
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GPGME_PROTOCOL_OpenPGP,
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GPG_ERR_NO_SECKEY, */
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#include <errno.h> /* perror() */
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#define BUFFER_SIZE 256