Blame apps/s_socket.c

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/*
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 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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 *
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 * Licensed under the OpenSSL license (the "License").  You may not use
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 * this file except in compliance with the License.  You can obtain a copy
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 * in the file LICENSE in the source distribution or at
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 * https://www.openssl.org/source/license.html
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 */
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/* socket-related functions used by s_client and s_server */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <signal.h>
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#include <openssl/opensslconf.h>
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/*
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 * With IPv6, it looks like Digital has mixed up the proper order of
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 * recursive header file inclusion, resulting in the compiler complaining
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 * that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which is
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 * needed to have fileno() declared correctly...  So let's define u_int
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 */
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#if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
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# define __U_INT
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typedef unsigned int u_int;
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#endif
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#ifndef OPENSSL_NO_SOCK
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# include "apps.h"
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# include "s_apps.h"
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# include "internal/sockets.h"
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# include <openssl/bio.h>
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# include <openssl/err.h>
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/* Keep track of our peer's address for the cookie callback */
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BIO_ADDR *ourpeer = NULL;
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/*
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 * init_client - helper routine to set up socket communication
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 * @sock: pointer to storage of resulting socket.
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 * @host: the host name or path (for AF_UNIX) to connect to.
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 * @port: the port to connect to (ignored for AF_UNIX).
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 * @bindhost: source host or path (for AF_UNIX).
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 * @bindport: source port (ignored for AF_UNIX).
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 * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
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 *  AF_UNSPEC
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 * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
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 * @protocol: socket protocol, e.g. IPPROTO_TCP or IPPROTO_UDP (or 0 for any)
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 *
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 * This will create a socket and use it to connect to a host:port, or if
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 * family == AF_UNIX, to the path found in host.
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 *
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 * If the host has more than one address, it will try them one by one until
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 * a successful connection is established.  The resulting socket will be
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 * found in *sock on success, it will be given INVALID_SOCKET otherwise.
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 *
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 * Returns 1 on success, 0 on failure.
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 */
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int init_client(int *sock, const char *host, const char *port,
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                const char *bindhost, const char *bindport,
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                int family, int type, int protocol)
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{
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    BIO_ADDRINFO *res = NULL;
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    BIO_ADDRINFO *bindaddr = NULL;
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    const BIO_ADDRINFO *ai = NULL;
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    const BIO_ADDRINFO *bi = NULL;
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    int found = 0;
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    int ret;
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    if (BIO_sock_init() != 1)
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        return 0;
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    ret = BIO_lookup_ex(host, port, BIO_LOOKUP_CLIENT, family, type, protocol,
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                        &res;;
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    if (ret == 0) {
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        ERR_print_errors(bio_err);
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        return 0;
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    }
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    if (bindhost != NULL || bindport != NULL) {
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        ret = BIO_lookup_ex(bindhost, bindport, BIO_LOOKUP_CLIENT,
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                            family, type, protocol, &bindaddr);
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        if (ret == 0) {
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            ERR_print_errors (bio_err);
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            goto out;
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        }
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    }
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    ret = 0;
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    for (ai = res; ai != NULL; ai = BIO_ADDRINFO_next(ai)) {
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        /* Admittedly, these checks are quite paranoid, we should not get
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         * anything in the BIO_ADDRINFO chain that we haven't
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         * asked for. */
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        OPENSSL_assert((family == AF_UNSPEC
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                        || family == BIO_ADDRINFO_family(ai))
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                       && (type == 0 || type == BIO_ADDRINFO_socktype(ai))
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                       && (protocol == 0
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                           || protocol == BIO_ADDRINFO_protocol(ai)));
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        if (bindaddr != NULL) {
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            for (bi = bindaddr; bi != NULL; bi = BIO_ADDRINFO_next(bi)) {
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                if (BIO_ADDRINFO_family(bi) == BIO_ADDRINFO_family(ai))
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                    break;
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            }
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            if (bi == NULL)
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                continue;
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            ++found;
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        }
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        *sock = BIO_socket(BIO_ADDRINFO_family(ai), BIO_ADDRINFO_socktype(ai),
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                           BIO_ADDRINFO_protocol(ai), 0);
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        if (*sock == INVALID_SOCKET) {
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            /* Maybe the kernel doesn't support the socket family, even if
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             * BIO_lookup() added it in the returned result...
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             */
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            continue;
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        }
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        if (bi != NULL) {
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            if (!BIO_bind(*sock, BIO_ADDRINFO_address(bi),
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                          BIO_SOCK_REUSEADDR)) {
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                BIO_closesocket(*sock);
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                *sock = INVALID_SOCKET;
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                break;
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            }
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        }
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#ifndef OPENSSL_NO_SCTP
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        if (protocol == IPPROTO_SCTP) {
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            /*
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             * For SCTP we have to set various options on the socket prior to
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             * connecting. This is done automatically by BIO_new_dgram_sctp().
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             * We don't actually need the created BIO though so we free it again
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             * immediately.
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             */
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            BIO *tmpbio = BIO_new_dgram_sctp(*sock, BIO_NOCLOSE);
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            if (tmpbio == NULL) {
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                ERR_print_errors(bio_err);
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                return 0;
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            }
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            BIO_free(tmpbio);
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        }
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#endif
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        if (!BIO_connect(*sock, BIO_ADDRINFO_address(ai),
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                         protocol == IPPROTO_TCP ? BIO_SOCK_NODELAY : 0)) {
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            BIO_closesocket(*sock);
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            *sock = INVALID_SOCKET;
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            continue;
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        }
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        /* Success, don't try any more addresses */
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        break;
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    }
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    if (*sock == INVALID_SOCKET) {
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        if (bindaddr != NULL && !found) {
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            BIO_printf(bio_err, "Can't bind %saddress for %s%s%s\n",
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                       BIO_ADDRINFO_family(res) == AF_INET6 ? "IPv6 " :
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                       BIO_ADDRINFO_family(res) == AF_INET ? "IPv4 " :
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                       BIO_ADDRINFO_family(res) == AF_UNIX ? "unix " : "",
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                       bindhost != NULL ? bindhost : "",
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                       bindport != NULL ? ":" : "",
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                       bindport != NULL ? bindport : "");
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            ERR_clear_error();
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            ret = 0;
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        }
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        ERR_print_errors(bio_err);
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    } else {
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        /* Remove any stale errors from previous connection attempts */
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        ERR_clear_error();
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        ret = 1;
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    }
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out:
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    if (bindaddr != NULL) {
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        BIO_ADDRINFO_free (bindaddr);
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    }
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    BIO_ADDRINFO_free(res);
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    return ret;
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}
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/*
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 * do_server - helper routine to perform a server operation
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 * @accept_sock: pointer to storage of resulting socket.
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 * @host: the host name or path (for AF_UNIX) to connect to.
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 * @port: the port to connect to (ignored for AF_UNIX).
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 * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
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 *  AF_UNSPEC
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 * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
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 * @cb: pointer to a function that receives the accepted socket and
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 *  should perform the communication with the connecting client.
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 * @context: pointer to memory that's passed verbatim to the cb function.
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 * @naccept: number of times an incoming connect should be accepted.  If -1,
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 *  unlimited number.
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 *
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 * This will create a socket and use it to listen to a host:port, or if
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 * family == AF_UNIX, to the path found in host, then start accepting
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 * incoming connections and run cb on the resulting socket.
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 *
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 * 0 on failure, something other on success.
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 */
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int do_server(int *accept_sock, const char *host, const char *port,
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              int family, int type, int protocol, do_server_cb cb,
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              unsigned char *context, int naccept, BIO *bio_s_out)
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{
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    int asock = 0;
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    int sock;
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    int i;
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    BIO_ADDRINFO *res = NULL;
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    const BIO_ADDRINFO *next;
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    int sock_family, sock_type, sock_protocol, sock_port;
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    const BIO_ADDR *sock_address;
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    int sock_options = BIO_SOCK_REUSEADDR;
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    int ret = 0;
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    if (BIO_sock_init() != 1)
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        return 0;
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    if (!BIO_lookup_ex(host, port, BIO_LOOKUP_SERVER, family, type, protocol,
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                       &res)) {
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        ERR_print_errors(bio_err);
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        return 0;
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    }
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    /* Admittedly, these checks are quite paranoid, we should not get
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     * anything in the BIO_ADDRINFO chain that we haven't asked for */
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    OPENSSL_assert((family == AF_UNSPEC || family == BIO_ADDRINFO_family(res))
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                   && (type == 0 || type == BIO_ADDRINFO_socktype(res))
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                   && (protocol == 0 || protocol == BIO_ADDRINFO_protocol(res)));
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    sock_family = BIO_ADDRINFO_family(res);
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    sock_type = BIO_ADDRINFO_socktype(res);
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    sock_protocol = BIO_ADDRINFO_protocol(res);
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    sock_address = BIO_ADDRINFO_address(res);
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    next = BIO_ADDRINFO_next(res);
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    if (sock_family == AF_INET6)
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        sock_options |= BIO_SOCK_V6_ONLY;
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    if (next != NULL
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            && BIO_ADDRINFO_socktype(next) == sock_type
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            && BIO_ADDRINFO_protocol(next) == sock_protocol) {
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        if (sock_family == AF_INET
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                && BIO_ADDRINFO_family(next) == AF_INET6) {
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            sock_family = AF_INET6;
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            sock_address = BIO_ADDRINFO_address(next);
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        } else if (sock_family == AF_INET6
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                   && BIO_ADDRINFO_family(next) == AF_INET) {
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            sock_options &= ~BIO_SOCK_V6_ONLY;
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        }
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    }
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    asock = BIO_socket(sock_family, sock_type, sock_protocol, 0);
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    if (asock == INVALID_SOCKET
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        || !BIO_listen(asock, sock_address, sock_options)) {
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        BIO_ADDRINFO_free(res);
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        ERR_print_errors(bio_err);
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        if (asock != INVALID_SOCKET)
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            BIO_closesocket(asock);
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        goto end;
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    }
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#ifndef OPENSSL_NO_SCTP
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    if (protocol == IPPROTO_SCTP) {
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        /*
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         * For SCTP we have to set various options on the socket prior to
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         * accepting. This is done automatically by BIO_new_dgram_sctp().
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         * We don't actually need the created BIO though so we free it again
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         * immediately.
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         */
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        BIO *tmpbio = BIO_new_dgram_sctp(asock, BIO_NOCLOSE);
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        if (tmpbio == NULL) {
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            BIO_closesocket(asock);
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            ERR_print_errors(bio_err);
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            goto end;
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        }
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        BIO_free(tmpbio);
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    }
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#endif
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    sock_port = BIO_ADDR_rawport(sock_address);
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    BIO_ADDRINFO_free(res);
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    res = NULL;
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    if (sock_port == 0) {
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        /* dynamically allocated port, report which one */
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        union BIO_sock_info_u info;
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        char *hostname = NULL;
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        char *service = NULL;
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        int success = 0;
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        if ((info.addr = BIO_ADDR_new()) != NULL
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            && BIO_sock_info(asock, BIO_SOCK_INFO_ADDRESS, &info)
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            && (hostname = BIO_ADDR_hostname_string(info.addr, 1)) != NULL
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            && (service = BIO_ADDR_service_string(info.addr, 1)) != NULL
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            && BIO_printf(bio_s_out,
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                          strchr(hostname, ':') == NULL
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                          ? /* IPv4 */ "ACCEPT %s:%s\n"
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                          : /* IPv6 */ "ACCEPT [%s]:%s\n",
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                          hostname, service) > 0)
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            success = 1;
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        (void)BIO_flush(bio_s_out);
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        OPENSSL_free(hostname);
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        OPENSSL_free(service);
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        BIO_ADDR_free(info.addr);
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        if (!success) {
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            BIO_closesocket(asock);
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            ERR_print_errors(bio_err);
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            goto end;
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        }
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    } else {
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        (void)BIO_printf(bio_s_out, "ACCEPT\n");
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        (void)BIO_flush(bio_s_out);
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    }
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    if (accept_sock != NULL)
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        *accept_sock = asock;
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    for (;;) {
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        char sink[64];
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        struct timeval timeout;
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        fd_set readfds;
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        if (type == SOCK_STREAM) {
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            BIO_ADDR_free(ourpeer);
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            ourpeer = BIO_ADDR_new();
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            if (ourpeer == NULL) {
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                BIO_closesocket(asock);
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                ERR_print_errors(bio_err);
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                goto end;
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            }
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            do {
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                sock = BIO_accept_ex(asock, ourpeer, 0);
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            } while (sock < 0 && BIO_sock_should_retry(sock));
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            if (sock < 0) {
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                ERR_print_errors(bio_err);
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                BIO_closesocket(asock);
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                break;
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            }
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            BIO_set_tcp_ndelay(sock, 1);
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            i = (*cb)(sock, type, protocol, context);
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            /*
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             * If we ended with an alert being sent, but still with data in the
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             * network buffer to be read, then calling BIO_closesocket() will
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             * result in a TCP-RST being sent. On some platforms (notably
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             * Windows) then this will result in the peer immediately abandoning
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             * the connection including any buffered alert data before it has
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             * had a chance to be read. Shutting down the sending side first,
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             * and then closing the socket sends TCP-FIN first followed by
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             * TCP-RST. This seems to allow the peer to read the alert data.
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             */
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            shutdown(sock, 1); /* SHUT_WR */
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            /*
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             * We just said we have nothing else to say, but it doesn't mean
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             * that the other side has nothing. It's even recommended to
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             * consume incoming data. [In testing context this ensures that
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             * alerts are passed on...]
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             */
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            timeout.tv_sec = 0;
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            timeout.tv_usec = 500000;  /* some extreme round-trip */
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            do {
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                FD_ZERO(&readfds);
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                openssl_fdset(sock, &readfds);
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            } while (select(sock + 1, &readfds, NULL, NULL, &timeout) > 0
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                     && readsocket(sock, sink, sizeof(sink)) > 0);
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            BIO_closesocket(sock);
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        } else {
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            i = (*cb)(asock, type, protocol, context);
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        }
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        if (naccept != -1)
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            naccept--;
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        if (i < 0 || naccept == 0) {
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            BIO_closesocket(asock);
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            ret = i;
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            break;
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        }
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    }
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 end:
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# ifdef AF_UNIX
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    if (family == AF_UNIX)
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        unlink(host);
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# endif
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    BIO_ADDR_free(ourpeer);
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    ourpeer = NULL;
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    return ret;
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}
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#endif  /* OPENSSL_NO_SOCK */