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240 lines
6.4 KiB
240 lines
6.4 KiB
/*
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* Copyright (c) 2002 - 2003
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* NetGroup, Politecnico di Torino (Italy)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Politecnico di Torino nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef HAVE_OPENSSL
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#include <stdlib.h>
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#include "portability.h"
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#include "sslutils.h"
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static const char *ssl_keyfile = ""; //!< file containing the private key in PEM format
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static const char *ssl_certfile = ""; //!< file containing the server's certificate in PEM format
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static const char *ssl_rootfile = ""; //!< file containing the list of CAs trusted by the client
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// TODO: a way to set ssl_rootfile from the command line, or an envvar?
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// TODO: lock?
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static SSL_CTX *ctx;
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void ssl_set_certfile(const char *certfile)
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{
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ssl_certfile = certfile;
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}
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void ssl_set_keyfile(const char *keyfile)
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{
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ssl_keyfile = keyfile;
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}
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int ssl_init_once(int is_server, int enable_compression, char *errbuf, size_t errbuflen)
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{
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static int inited = 0;
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if (inited) return 0;
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SSL_library_init();
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SSL_load_error_strings();
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OpenSSL_add_ssl_algorithms();
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if (enable_compression)
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SSL_COMP_get_compression_methods();
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SSL_METHOD const *meth =
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is_server ? SSLv23_server_method() : SSLv23_client_method();
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ctx = SSL_CTX_new(meth);
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if (! ctx)
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{
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snprintf(errbuf, errbuflen, "Cannot get a new SSL context: %s", ERR_error_string(ERR_get_error(), NULL));
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goto die;
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}
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SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY);
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if (is_server)
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{
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char const *certfile = ssl_certfile[0] ? ssl_certfile : "cert.pem";
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if (1 != SSL_CTX_use_certificate_file(ctx, certfile, SSL_FILETYPE_PEM))
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{
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snprintf(errbuf, errbuflen, "Cannot read certificate file %s: %s", certfile, ERR_error_string(ERR_get_error(), NULL));
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goto die;
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}
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char const *keyfile = ssl_keyfile[0] ? ssl_keyfile : "key.pem";
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if (1 != SSL_CTX_use_PrivateKey_file(ctx, keyfile, SSL_FILETYPE_PEM))
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{
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snprintf(errbuf, errbuflen, "Cannot read private key file %s: %s", keyfile, ERR_error_string(ERR_get_error(), NULL));
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goto die;
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}
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}
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else
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{
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if (ssl_rootfile[0])
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{
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if (! SSL_CTX_load_verify_locations(ctx, ssl_rootfile, 0))
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{
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snprintf(errbuf, errbuflen, "Cannot read CA list from %s", ssl_rootfile);
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goto die;
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}
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}
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else
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{
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SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL);
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}
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}
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#if 0
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if (! RAND_load_file(RANDOM, 1024*1024))
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{
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snprintf(errbuf, errbuflen, "Cannot init random");
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goto die;
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}
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if (is_server)
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{
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SSL_CTX_set_session_id_context(ctx, (void *)&s_server_session_id_context, sizeof(s_server_session_id_context));
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}
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#endif
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inited = 1;
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return 0;
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die:
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return -1;
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}
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SSL *ssl_promotion(int is_server, SOCKET s, char *errbuf, size_t errbuflen)
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{
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if (ssl_init_once(is_server, 1, errbuf, errbuflen) < 0) {
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return NULL;
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}
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SSL *ssl = SSL_new(ctx); // TODO: also a DTLS context
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SSL_set_fd(ssl, (int)s);
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if (is_server) {
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if (SSL_accept(ssl) <= 0) {
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snprintf(errbuf, errbuflen, "SSL_accept(): %s",
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ERR_error_string(ERR_get_error(), NULL));
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return NULL;
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}
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} else {
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if (SSL_connect(ssl) <= 0) {
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snprintf(errbuf, errbuflen, "SSL_connect(): %s",
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ERR_error_string(ERR_get_error(), NULL));
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return NULL;
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}
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}
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return ssl;
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}
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// Finish using an SSL handle; shut down the connection and free the
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// handle.
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void ssl_finish(SSL *ssl)
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{
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//
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// We won't be using this again, so we can just send the
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// shutdown alert and free up the handle, and have our
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// caller close the socket.
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//
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// XXX - presumably, if the connection is shut down on
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// our side, either our peer won't have a problem sending
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// their shutdown alert or will not treat such a problem
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// as an error. If this causes errors to be reported,
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// fix that as appropriate.
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//
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SSL_shutdown(ssl);
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SSL_free(ssl);
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}
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// Same return value as sock_send:
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// 0 on OK, -1 on error but closed connection (-2).
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int ssl_send(SSL *ssl, char const *buffer, int size, char *errbuf, size_t errbuflen)
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{
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int status = SSL_write(ssl, buffer, size);
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if (status > 0)
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{
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// "SSL_write() will only return with success, when the complete contents (...) has been written."
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return 0;
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}
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else
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{
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int ssl_err = SSL_get_error(ssl, status); // TODO: does it pop the error?
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if (ssl_err == SSL_ERROR_ZERO_RETURN)
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{
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return -2;
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}
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else if (ssl_err == SSL_ERROR_SYSCALL)
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{
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#ifndef _WIN32
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if (errno == ECONNRESET || errno == EPIPE) return -2;
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#endif
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}
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snprintf(errbuf, errbuflen, "SSL_write(): %s",
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ERR_error_string(ERR_get_error(), NULL));
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return -1;
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}
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}
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// Returns the number of bytes read, or -1 on syserror, or -2 on SSL error.
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int ssl_recv(SSL *ssl, char *buffer, int size, char *errbuf, size_t errbuflen)
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{
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int status = SSL_read(ssl, buffer, size);
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if (status <= 0)
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{
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int ssl_err = SSL_get_error(ssl, status);
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if (ssl_err == SSL_ERROR_ZERO_RETURN)
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{
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return 0;
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}
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else if (ssl_err == SSL_ERROR_SYSCALL)
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{
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return -1;
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}
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else
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{
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// Should not happen
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snprintf(errbuf, errbuflen, "SSL_read(): %s",
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ERR_error_string(ERR_get_error(), NULL));
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return -2;
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}
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}
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else
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{
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return status;
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}
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}
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#endif // HAVE_OPENSSL
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