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* "browse_callback", and parts of "main".
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* Everything else is
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* Copyright © 2008-2018 Teddy Hogeborn
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* Copyright © 2008-2018 Björn Påhlsson
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* Copyright © 2008-2020 Teddy Hogeborn
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* Copyright © 2008-2020 Björn Påhlsson
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* This file is part of Mandos.
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), seteuid(),
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setgid(), pause(), _exit(),
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unlinkat(), lstat(), symlink() */
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#include <arpa/inet.h> /* inet_pton(), htons() */
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#include <iso646.h> /* not, or, and */
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#include <argp.h> /* struct argp_option, error_t, struct
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init_gnutls_session(),
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#if GNUTLS_VERSION_NUMBER < 0x030600
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#include <gnutls/openpgp.h>
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/* gnutls_certificate_set_openpgp_key_file(),
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GNUTLS_OPENPGP_FMT_BASE64 */
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#elif GNUTLS_VERSION_NUMBER >= 0x030606
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#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
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GNUTLS_PKCS_NULL_PASSWORD */
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#include <gpgme.h> /* All GPGME types, constants and
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#define PATHDIR "/conf/conf.d/mandos"
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#define SECKEY "seckey.txt"
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#define PUBKEY "pubkey.txt"
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#define TLS_PRIVKEY "tls-privkey.pem"
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#define TLS_PUBKEY "tls-pubkey.pem"
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#define HOOKDIR "/lib/mandos/network-hooks.d"
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bool debug = false;
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fprintf_plus(stderr,
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"Setting system clock to key file mtime");
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time_t keytime = keystat.st_mtim.tv_sec;
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if(stime(&keytime) != 0){
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perror_plus("stime");
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if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
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perror_plus("clock_settime");
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ret = lower_privileges();
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fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
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" secret key %s as GnuTLS credentials\n",
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fprintf_plus(stderr, "Attempting to use public key %s and"
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" private key %s as GnuTLS credentials\n",
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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ret = gnutls_certificate_set_rawpk_key_file
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(mc->cred, pubkeyfilename, seckeyfilename,
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GNUTLS_X509_FMT_PEM, /* format */
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GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
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0, /* names_length */
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GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
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0); /* pkcs11_flags */
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#elif GNUTLS_VERSION_NUMBER < 0x030600
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ret = gnutls_certificate_set_openpgp_key_file
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(mc->cred, pubkeyfilename, seckeyfilename,
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GNUTLS_OPENPGP_FMT_BASE64);
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#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
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if(ret != GNUTLS_E_SUCCESS){
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fprintf_plus(stderr,
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"Error[%d] while reading the OpenPGP key pair ('%s',"
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"Error[%d] while reading the key pair ('%s',"
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" '%s')\n", ret, pubkeyfilename, seckeyfilename);
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fprintf_plus(stderr, "The GnuTLS error is: %s\n",
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safer_gnutls_strerror(ret));
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if(dhparamsfilename == NULL){
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if(mc->dh_bits == 0){
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#if GNUTLS_VERSION_NUMBER < 0x030600
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/* Find out the optimal number of DH bits */
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/* Try to read the private key file */
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gnutls_datum_t buffer = { .data = NULL, .size = 0 };
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safer_gnutls_strerror(ret));
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fprintf_plus(stderr, "DH bits explicitly set to %u\n",
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ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
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if(ret != GNUTLS_E_SUCCESS){
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fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
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" bits): %s\n", mc->dh_bits,
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safer_gnutls_strerror(ret));
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} else { /* dh_bits != 0 */
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fprintf_plus(stderr, "DH bits explicitly set to %u\n",
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ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
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if(ret != GNUTLS_E_SUCCESS){
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fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
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" bits): %s\n", mc->dh_bits,
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safer_gnutls_strerror(ret));
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gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
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gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
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/* GnuTLS session creation */
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ret = gnutls_init(session, GNUTLS_SERVER);
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ret = gnutls_init(session, (GNUTLS_SERVER
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#if GNUTLS_VERSION_NUMBER >= 0x030506
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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| GNUTLS_ENABLE_RAWPK
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ret = setgroups(0, NULL);
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perror_plus("setgroups");
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_exit(EX_NOPERM);
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ret = dup2(devnull, STDIN_FILENO);
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perror_plus("dup2(devnull, STDIN_FILENO)");
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_exit(EX_OSERR);
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ret = close(devnull);
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perror_plus("close");
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ret = dup2(STDERR_FILENO, STDOUT_FILENO);
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int main(int argc, char *argv[]){
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mandos_context mc = { .server = NULL, .dh_bits = 0,
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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.priority = "SECURE128:!CTYPE-X.509"
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":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
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#elif GNUTLS_VERSION_NUMBER < 0x030600
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.priority = "SECURE256:!CTYPE-X.509"
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":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
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#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
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.current_server = NULL, .interfaces = NULL,
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.interfaces_size = 0 };
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AvahiSServiceBrowser *sb = NULL;
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AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
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const char *seckey = PATHDIR "/" SECKEY;
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const char *pubkey = PATHDIR "/" PUBKEY;
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
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const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
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const char *dh_params_file = NULL;
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char *interfaces_hooks = NULL;
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{ .name = "pubkey", .key = 'p',
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.doc = "OpenPGP public key file base name",
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{ .name = "tls-privkey", .key = 't',
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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.doc = "TLS private key file base name",
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.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
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{ .name = "tls-pubkey", .key = 'T',
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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.doc = "TLS public key file base name",
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.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
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{ .name = "dh-bits", .key = 129,
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.doc = "Bit length of the prime number used in the"
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case 'p': /* --pubkey */
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case 't': /* --tls-privkey */
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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case 'T': /* --tls-pubkey */
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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case 129: /* --dh-bits */
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tmpmax = strtoimax(arg, &tmp, 10);
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argp_state_help(state, state->out_stream,
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(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
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& ~(unsigned int)ARGP_HELP_EXIT_OK);
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__builtin_unreachable();
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case -3: /* --usage */
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argp_state_help(state, state->out_stream,
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ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
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__builtin_unreachable();
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case 'V': /* --version */
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fprintf_plus(state->out_stream, "%s\n", argp_program_version);
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exit(argp_err_exit_status);
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struct stat st;
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/* Work around Debian bug #633582:
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<https://bugs.debian.org/633582> */
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if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
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int seckey_fd = open(seckey, O_RDONLY);
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if(seckey_fd == -1){
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/* Work around Debian bug #981302
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<https://bugs.debian.org/981302> */
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if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
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ret = symlink("/proc/self/fd", "/dev/fd");
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perror_plus("Failed to create /dev/fd symlink");
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/* Lower privileges */
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ret = lower_privileges();
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#if GNUTLS_VERSION_NUMBER >= 0x030606
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ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
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#elif GNUTLS_VERSION_NUMBER < 0x030600
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ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
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#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
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fprintf_plus(stderr, "init_gnutls_global failed\n");
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exitcode = EX_UNAVAILABLE;