ab: Keep reading nonblocking to exhaust TCP or SSL buffers when previous

[apache] / support / ab.c

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
   ** This program is based on ZeusBench V1.0 written by Adam Twiss
   ** which is Copyright (c) 1996 by Zeus Technology Ltd. http://www.zeustech.net/
   **
   ** This software is provided "as is" and any express or implied waranties,
   ** including but not limited to, the implied warranties of merchantability and
   ** fitness for a particular purpose are disclaimed.  In no event shall
   ** Zeus Technology Ltd. be liable for any direct, indirect, incidental, special,
   ** exemplary, or consequential damaged (including, but not limited to,
   ** procurement of substitute good or services; loss of use, data, or profits;
   ** or business interruption) however caused and on theory of liability.  Whether
   ** in contract, strict liability or tort (including negligence or otherwise)
   ** arising in any way out of the use of this software, even if advised of the
   ** possibility of such damage.
   **
 */

/*
   ** HISTORY:
   **    - Originally written by Adam Twiss <adam@zeus.co.uk>, March 1996
   **      with input from Mike Belshe <mbelshe@netscape.com> and
   **      Michael Campanella <campanella@stevms.enet.dec.com>
   **    - Enhanced by Dean Gaudet <dgaudet@apache.org>, November 1997
   **    - Cleaned up by Ralf S. Engelschall <rse@apache.org>, March 1998
   **    - POST and verbosity by Kurt Sussman <kls@merlot.com>, August 1998
   **    - HTML table output added by David N. Welton <davidw@prosa.it>, January 1999
   **    - Added Cookie, Arbitrary header and auth support. <dirkx@webweaving.org>, April 1999
   ** Version 1.3d
   **    - Increased version number - as some of the socket/error handling has
   **      fundamentally changed - and will give fundamentally different results
   **      in situations where a server is dropping requests. Therefore you can
   **      no longer compare results of AB as easily. Hence the inc of the version.
   **      They should be closer to the truth though. Sander & <dirkx@covalent.net>, End 2000.
   **    - Fixed proxy functionality, added median/mean statistics, added gnuplot
   **      output option, added _experimental/rudimentary_ SSL support. Added
   **      confidence guestimators and warnings. Sander & <dirkx@covalent.net>, End 2000
   **    - Fixed serious int overflow issues which would cause realistic (longer
   **      than a few minutes) run's to have wrong (but believable) results. Added
   **      trapping of connection errors which influenced measurements.
   **      Contributed by Sander Temme, Early 2001
   ** Version 1.3e
   **    - Changed timeout behavour during write to work whilst the sockets
   **      are filling up and apr_write() does writes a few - but not all.
   **      This will potentially change results. <dirkx@webweaving.org>, April 2001
   ** Version 2.0.36-dev
   **    Improvements to concurrent processing:
   **      - Enabled non-blocking connect()s.
   **      - Prevent blocking calls to apr_socket_recv() (thereby allowing AB to
   **        manage its entire set of socket descriptors).
   **      - Any error returned from apr_socket_recv() that is not EAGAIN or EOF
   **        is now treated as fatal.
   **      Contributed by Aaron Bannert, April 24, 2002
   **
   ** Version 2.0.36-2
   **     Internalized the version string - this string is part
   **     of the Agent: header and the result output.
   **
   ** Version 2.0.37-dev
   **     Adopted SSL code by Madhu Mathihalli <madhusudan_mathihalli@hp.com>
   **     [PATCH] ab with SSL support  Posted Wed, 15 Aug 2001 20:55:06 GMT
   **     Introduces four 'if (int == value)' tests per non-ssl request.
   **
   ** Version 2.0.40-dev
   **     Switched to the new abstract pollset API, allowing ab to
   **     take advantage of future apr_pollset_t scalability improvements.
   **     Contributed by Brian Pane, August 31, 2002
   **
   ** Version 2.3
   **     SIGINT now triggers output_results().
   **     Contributed by colm, March 30, 2006
   **/

/* Note: this version string should start with \d+[\d\.]* and be a valid
 * string for an HTTP Agent: header when prefixed with 'ApacheBench/'.
 * It should reflect the version of AB - and not that of the apache server
 * it happens to accompany. And it should be updated or changed whenever
 * the results are no longer fundamentally comparable to the results of
 * a previous version of ab. Either due to a change in the logic of
 * ab - or to due to a change in the distribution it is compiled with
 * (such as an APR change in for example blocking).
 */
#define AP_AB_BASEREVISION "2.3"

/*
 * BUGS:
 *
 * - uses strcpy/etc.
 * - has various other poor buffer attacks related to the lazy parsing of
 *   response headers from the server
 * - doesn't implement much of HTTP/1.x, only accepts certain forms of
 *   responses
 * - (performance problem) heavy use of strstr shows up top in profile
 *   only an issue for loopback usage
 */

/*  -------------------------------------------------------------------- */

#if 'A' != 0x41
/* Hmmm... This source code isn't being compiled in ASCII.
 * In order for data that flows over the network to make
 * sense, we need to translate to/from ASCII.
 */
#define NOT_ASCII
#endif

/* affects include files on Solaris */
#define BSD_COMP

#include "apr.h"
#include "apr_signal.h"
#include "apr_strings.h"
#include "apr_network_io.h"
#include "apr_file_io.h"
#include "apr_time.h"
#include "apr_getopt.h"
#include "apr_general.h"
#include "apr_lib.h"
#include "apr_portable.h"
#include "ap_release.h"
#include "apr_poll.h"

#define APR_WANT_STRFUNC
#include "apr_want.h"

#include "apr_base64.h"
#ifdef NOT_ASCII
#include "apr_xlate.h"
#endif
#if APR_HAVE_STDIO_H
#include <stdio.h>
#endif
#if APR_HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if APR_HAVE_UNISTD_H
#include <unistd.h> /* for getpid() */
#endif

#if !defined(WIN32) && !defined(NETWARE)
#include "ap_config_auto.h"
#endif

#if defined(HAVE_OPENSSL)

#include <openssl/rsa.h>
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <openssl/rand.h>
#define USE_SSL
#define SK_NUM(x) sk_X509_num(x)
#define SK_VALUE(x,y) sk_X509_value(x,y)
typedef STACK_OF(X509) X509_STACK_TYPE;

#if defined(_MSC_VER)
/* The following logic ensures we correctly glue FILE* within one CRT used
 * by the OpenSSL library build to another CRT used by the ab.exe build.
 * This became especially problematic with Visual Studio 2015.
 */
#include <openssl/applink.c>
#endif

#endif

#if defined(USE_SSL)
#if (OPENSSL_VERSION_NUMBER >= 0x00909000)
#define AB_SSL_METHOD_CONST const
#else
#define AB_SSL_METHOD_CONST
#endif
#if (OPENSSL_VERSION_NUMBER >= 0x0090707f)
#define AB_SSL_CIPHER_CONST const
#else
#define AB_SSL_CIPHER_CONST
#endif
#ifdef SSL_OP_NO_TLSv1_2
#define HAVE_TLSV1_X
#endif
#if !defined(OPENSSL_NO_TLSEXT) && defined(SSL_set_tlsext_host_name)
#define HAVE_TLSEXT
#endif
#if defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x2060000f
#define SSL_CTRL_SET_MIN_PROTO_VERSION 123
#define SSL_CTRL_SET_MAX_PROTO_VERSION 124
#define SSL_CTX_set_min_proto_version(ctx, version) \
   SSL_CTX_ctrl(ctx, SSL_CTRL_SET_MIN_PROTO_VERSION, version, NULL)
#define SSL_CTX_set_max_proto_version(ctx, version) \
   SSL_CTX_ctrl(ctx, SSL_CTRL_SET_MAX_PROTO_VERSION, version, NULL)
#endif
#endif

#include <math.h>
#if APR_HAVE_CTYPE_H
#include <ctype.h>
#endif
#if APR_HAVE_LIMITS_H
#include <limits.h>
#endif

/* ------------------- DEFINITIONS -------------------------- */

#ifndef LLONG_MAX
#define AB_MAX APR_INT64_C(0x7fffffffffffffff)
#else
#define AB_MAX LLONG_MAX
#endif

/* maximum number of requests on a time limited test */
#define MAX_REQUESTS (INT_MAX > 50000 ? 50000 : INT_MAX)

/* connection state
 * don't add enums or rearrange or otherwise change values without
 * visiting set_conn_state()
 */
typedef enum {
    STATE_UNCONNECTED = 0,
    STATE_CONNECTING,           /* TCP connect initiated, but we don't
                                 * know if it worked yet
                                 */
    STATE_CONNECTED,            /* we know TCP connect completed */
    STATE_READ
} connect_state_e;

#define CBUFFSIZE (8192)

struct connection {
    apr_pool_t *ctx;
    apr_socket_t *aprsock;
    apr_pollfd_t pollfd;
    int state;
    apr_size_t read;            /* amount of bytes read */
    apr_size_t bread;           /* amount of body read */
    apr_size_t rwrite, rwrote;  /* keep pointers in what we write - across
                                 * EAGAINs */
    apr_size_t length;          /* Content-Length value used for keep-alive */
    char cbuff[CBUFFSIZE];      /* a buffer to store server response header */
    int cbx;                    /* offset in cbuffer */
    int keepalive;              /* non-zero if a keep-alive request */
    int gotheader;              /* non-zero if we have the entire header in
                                 * cbuff */
    apr_time_t start,           /* Start of connection */
               connect,         /* Connected, start writing */
               endwrite,        /* Request written */
               beginread,       /* First byte of input */
               done;            /* Connection closed */

    int socknum;
#ifdef USE_SSL
    SSL *ssl;
#endif
};

struct data {
    apr_time_t starttime;         /* start time of connection */
    apr_interval_time_t waittime; /* between request and reading response */
    apr_interval_time_t ctime;    /* time to connect */
    apr_interval_time_t time;     /* time for connection */
};

#define ap_min(a,b) (((a)<(b))?(a):(b))
#define ap_max(a,b) (((a)>(b))?(a):(b))
#define ap_round_ms(a) ((apr_time_t)((a) + 500)/1000)
#define ap_double_ms(a) ((double)(a)/1000.0)
#define MAX_CONCURRENCY 20000

/* --------------------- GLOBALS ---------------------------- */

int verbosity = 0;      /* no verbosity by default */
int recverrok = 0;      /* ok to proceed after socket receive errors */
enum {NO_METH = 0, GET, HEAD, PUT, POST, CUSTOM_METHOD} method = NO_METH;
const char *method_str[] = {"bug", "GET", "HEAD", "PUT", "POST", ""};
int send_body = 0;      /* non-zero if sending body with request */
int requests = 1;       /* Number of requests to make */
int heartbeatres = 100; /* How often do we say we're alive */
int concurrency = 1;    /* Number of multiple requests to make */
int percentile = 1;     /* Show percentile served */
int nolength = 0;       /* Accept variable document length */
int confidence = 1;     /* Show confidence estimator and warnings */
int tlimit = 0;         /* time limit in secs */
int keepalive = 0;      /* try and do keepalive connections */
int windowsize = 0;     /* we use the OS default window size */
char servername[1024];  /* name that server reports */
char *hostname;         /* host name from URL */
const char *host_field;       /* value of "Host:" header field */
const char *path;             /* path name */
char *postdata;         /* *buffer containing data from postfile */
apr_size_t postlen = 0; /* length of data to be POSTed */
char *content_type = NULL;     /* content type to put in POST header */
const char *cookie,           /* optional cookie line */
           *auth,             /* optional (basic/uuencoded) auhentication */
           *hdrs;             /* optional arbitrary headers */
apr_port_t port;        /* port number */
char *proxyhost = NULL; /* proxy host name */
int proxyport = 0;      /* proxy port */
const char *connecthost;
const char *myhost;
apr_port_t connectport;
const char *gnuplot;          /* GNUplot file */
const char *csvperc;          /* CSV Percentile file */
const char *fullurl;
const char *colonhost;
int isproxy = 0;
apr_interval_time_t aprtimeout = apr_time_from_sec(30); /* timeout value */

/* overrides for ab-generated common headers */
const char *opt_host;   /* which optional "Host:" header specified, if any */
int opt_useragent = 0;  /* was an optional "User-Agent:" header specified? */
int opt_accept = 0;     /* was an optional "Accept:" header specified? */
 /*
  * XXX - this is now a per read/write transact type of value
  */

int use_html = 0;       /* use html in the report */
const char *tablestring;
const char *trstring;
const char *tdstring;

apr_size_t doclen = 0;     /* the length the document should be */
apr_int64_t totalread = 0;    /* total number of bytes read */
apr_int64_t totalbread = 0;   /* totoal amount of entity body read */
apr_int64_t totalposted = 0;  /* total number of bytes posted, inc. headers */
int started = 0;           /* number of requests started, so no excess */
int done = 0;              /* number of requests we have done */
int doneka = 0;            /* number of keep alive connections done */
int good = 0, bad = 0;     /* number of good and bad requests */
int epipe = 0;             /* number of broken pipe writes */
int err_length = 0;        /* requests failed due to response length */
int err_conn = 0;          /* requests failed due to connection drop */
int err_recv = 0;          /* requests failed due to broken read */
int err_except = 0;        /* requests failed due to exception */
int err_response = 0;      /* requests with invalid or non-200 response */

#ifdef USE_SSL
int is_ssl;
SSL_CTX *ssl_ctx;
char *ssl_cipher = NULL;
char *ssl_info = NULL;
char *ssl_tmp_key = NULL;
BIO *bio_out,*bio_err;
#ifdef HAVE_TLSEXT
int tls_use_sni = 1;         /* used by default, -I disables it */
const char *tls_sni = NULL; /* 'opt_host' if any, 'hostname' otherwise */
#endif
#endif

apr_time_t start, lasttime, stoptime;

/* global request (and its length) */
char _request[8192];
char *request = _request;
apr_size_t reqlen;
int requests_initialized = 0;

/* one global throw-away buffer to read stuff into */
char buffer[8192];

/* interesting percentiles */
int percs[] = {50, 66, 75, 80, 90, 95, 98, 99, 100};

struct connection *con;     /* connection array */
struct data *stats;         /* data for each request */
apr_pool_t *cntxt;

apr_pollset_t *readbits;

apr_sockaddr_t *mysa;
apr_sockaddr_t *destsa;

#ifdef NOT_ASCII
apr_xlate_t *from_ascii, *to_ascii;
#endif

static void write_request(struct connection * c);
static void close_connection(struct connection * c);

/* --------------------------------------------------------- */

/* simple little function to write an error string and exit */

static void err(const char *s)
{
    fprintf(stderr, "%s\n", s);
    if (done)
        printf("Total of %d requests completed\n" , done);
    exit(1);
}

/* simple little function to write an APR error string and exit */

static void apr_err(const char *s, apr_status_t rv)
{
    char buf[120];

    fprintf(stderr,
        "%s: %s (%d)\n",
        s, apr_strerror(rv, buf, sizeof buf), rv);
    if (done)
        printf("Total of %d requests completed\n" , done);
    exit(rv);
}

static void *xmalloc(size_t size)
{
    void *ret = malloc(size);
    if (ret == NULL) {
        fprintf(stderr, "Could not allocate memory (%"
                APR_SIZE_T_FMT" bytes)\n", size);
        exit(1);
    }
    return ret;
}

static void *xcalloc(size_t num, size_t size)
{
    void *ret = calloc(num, size);
    if (ret == NULL) {
        fprintf(stderr, "Could not allocate memory (%"
                APR_SIZE_T_FMT" bytes)\n", size*num);
        exit(1);
    }
    return ret;
}

static char *xstrdup(const char *s)
{
    char *ret = strdup(s);
    if (ret == NULL) {
        fprintf(stderr, "Could not allocate memory (%"
                APR_SIZE_T_FMT " bytes)\n", strlen(s));
        exit(1);
    }
    return ret;
}

/*
 * Similar to standard strstr() but we ignore case in this version.
 * Copied from ap_strcasestr().
 */
static char *xstrcasestr(const char *s1, const char *s2)
{
    char *p1, *p2;
    if (*s2 == '\0') {
        /* an empty s2 */
        return((char *)s1);
    }
    while(1) {
        for ( ; (*s1 != '\0') && (apr_tolower(*s1) != apr_tolower(*s2)); s1++);
        if (*s1 == '\0') {
            return(NULL);
        }
        /* found first character of s2, see if the rest matches */
        p1 = (char *)s1;
        p2 = (char *)s2;
        for (++p1, ++p2; apr_tolower(*p1) == apr_tolower(*p2); ++p1, ++p2) {
            if (*p1 == '\0') {
                /* both strings ended together */
                return((char *)s1);
            }
        }
        if (*p2 == '\0') {
            /* second string ended, a match */
            break;
        }
        /* didn't find a match here, try starting at next character in s1 */
        s1++;
    }
    return((char *)s1);
}

/* pool abort function */
static int abort_on_oom(int retcode)
{
    fprintf(stderr, "Could not allocate memory\n");
    exit(1);
    /* not reached */
    return retcode;
}

static void set_polled_events(struct connection *c, apr_int16_t new_reqevents)
{
    apr_status_t rv;

    if (c->pollfd.reqevents != new_reqevents) {
        if (c->pollfd.reqevents != 0) {
            rv = apr_pollset_remove(readbits, &c->pollfd);
            if (rv != APR_SUCCESS) {
                apr_err("apr_pollset_remove()", rv);
            }
        }

        if (new_reqevents != 0) {
            c->pollfd.reqevents = new_reqevents;
            rv = apr_pollset_add(readbits, &c->pollfd);
            if (rv != APR_SUCCESS) {
                apr_err("apr_pollset_add()", rv);
            }
        }
    }
}

static void set_conn_state(struct connection *c, connect_state_e new_state)
{
    apr_int16_t events_by_state[] = {
        0,           /* for STATE_UNCONNECTED */
        APR_POLLOUT, /* for STATE_CONNECTING */
        APR_POLLIN,  /* for STATE_CONNECTED; we don't poll in this state,
                      * so prepare for polling in the following state --
                      * STATE_READ
                      */
        APR_POLLIN   /* for STATE_READ */
    };

    c->state = new_state;

    set_polled_events(c, events_by_state[new_state]);
}

/* --------------------------------------------------------- */
/* write out request to a connection - assumes we can write
 * (small) request out in one go into our new socket buffer
 *
 */
#ifdef USE_SSL
static long ssl_print_cb(BIO *bio,int cmd,const char *argp,int argi,long argl,long ret)
{
    BIO *out;

    out=(BIO *)BIO_get_callback_arg(bio);
    if (out == NULL) return(ret);

    if (cmd == (BIO_CB_READ|BIO_CB_RETURN)) {
        BIO_printf(out,"read from %p [%p] (%d bytes => %ld (0x%lX))\n",
                   bio, argp, argi, ret, ret);
        BIO_dump(out,(char *)argp,(int)ret);
        return(ret);
    }
    else if (cmd == (BIO_CB_WRITE|BIO_CB_RETURN)) {
        BIO_printf(out,"write to %p [%p] (%d bytes => %ld (0x%lX))\n",
                   bio, argp, argi, ret, ret);
        BIO_dump(out,(char *)argp,(int)ret);
    }
    return ret;
}

static void ssl_state_cb(const SSL *s, int w, int r)
{
    if (w & SSL_CB_ALERT) {
        BIO_printf(bio_err, "SSL/TLS Alert [%s] %s:%s\n",
                   (w & SSL_CB_READ ? "read" : "write"),
                   SSL_alert_type_string_long(r),
                   SSL_alert_desc_string_long(r));
    } else if (w & SSL_CB_LOOP) {
        BIO_printf(bio_err, "SSL/TLS State [%s] %s\n",
                   (SSL_in_connect_init((SSL*)s) ? "connect" : "-"),
                   SSL_state_string_long(s));
    } else if (w & (SSL_CB_HANDSHAKE_START|SSL_CB_HANDSHAKE_DONE)) {
        BIO_printf(bio_err, "SSL/TLS Handshake [%s] %s\n",
                   (w & SSL_CB_HANDSHAKE_START ? "Start" : "Done"),
                   SSL_state_string_long(s));
    }
}

#ifndef RAND_MAX
#define RAND_MAX INT_MAX
#endif

static int ssl_rand_choosenum(int l, int h)
{
    int i;
    char buf[50];

    srand((unsigned int)time(NULL));
    apr_snprintf(buf, sizeof(buf), "%.0f",
                 (((double)(rand()%RAND_MAX)/RAND_MAX)*(h-l)));
    i = atoi(buf)+1;
    if (i < l) i = l;
    if (i > h) i = h;
    return i;
}

static void ssl_rand_seed(void)
{
    int n, l;
    time_t t;
    pid_t pid;
    unsigned char stackdata[256];

    /*
     * seed in the current time (usually just 4 bytes)
     */
    t = time(NULL);
    l = sizeof(time_t);
    RAND_seed((unsigned char *)&t, l);

    /*
     * seed in the current process id (usually just 4 bytes)
     */
    pid = getpid();
    l = sizeof(pid_t);
    RAND_seed((unsigned char *)&pid, l);

    /*
     * seed in some current state of the run-time stack (128 bytes)
     */
    n = ssl_rand_choosenum(0, sizeof(stackdata)-128-1);
    RAND_seed(stackdata+n, 128);
}

static int ssl_print_connection_info(BIO *bio, SSL *ssl)
{
    AB_SSL_CIPHER_CONST SSL_CIPHER *c;
    int alg_bits,bits;

    BIO_printf(bio,"Transport Protocol      :%s\n", SSL_get_version(ssl));

    c = SSL_get_current_cipher(ssl);
    BIO_printf(bio,"Cipher Suite Protocol   :%s\n", SSL_CIPHER_get_version(c));
    BIO_printf(bio,"Cipher Suite Name       :%s\n",SSL_CIPHER_get_name(c));

    bits = SSL_CIPHER_get_bits(c,&alg_bits);
    BIO_printf(bio,"Cipher Suite Cipher Bits:%d (%d)\n",bits,alg_bits);

    return(1);
}

static void ssl_print_cert_info(BIO *bio, X509 *cert)
{
    X509_NAME *dn;
    EVP_PKEY *pk;
    char buf[1024];

    BIO_printf(bio, "Certificate version: %ld\n", X509_get_version(cert)+1);
    BIO_printf(bio,"Valid from: ");
    ASN1_UTCTIME_print(bio, X509_get_notBefore(cert));
    BIO_printf(bio,"\n");

    BIO_printf(bio,"Valid to  : ");
    ASN1_UTCTIME_print(bio, X509_get_notAfter(cert));
    BIO_printf(bio,"\n");

    pk = X509_get_pubkey(cert);
    BIO_printf(bio,"Public key is %d bits\n",
               EVP_PKEY_bits(pk));
    EVP_PKEY_free(pk);

    dn = X509_get_issuer_name(cert);
    X509_NAME_oneline(dn, buf, sizeof(buf));
    BIO_printf(bio,"The issuer name is %s\n", buf);

    dn=X509_get_subject_name(cert);
    X509_NAME_oneline(dn, buf, sizeof(buf));
    BIO_printf(bio,"The subject name is %s\n", buf);

    /* dump the extension list too */
    BIO_printf(bio, "Extension Count: %d\n", X509_get_ext_count(cert));
}

static void ssl_print_info(struct connection *c)
{
    X509_STACK_TYPE *sk;
    X509 *cert;
    int count;

    BIO_printf(bio_err, "\n");
    sk = SSL_get_peer_cert_chain(c->ssl);
    if ((count = SK_NUM(sk)) > 0) {
        int i;
        for (i=1; i<count; i++) {
            cert = (X509 *)SK_VALUE(sk, i);
            ssl_print_cert_info(bio_out, cert);
    }
    }
    cert = SSL_get_peer_certificate(c->ssl);
    if (cert == NULL) {
        BIO_printf(bio_out, "Anon DH\n");
    } else {
        BIO_printf(bio_out, "Peer certificate\n");
        ssl_print_cert_info(bio_out, cert);
        X509_free(cert);
    }
    ssl_print_connection_info(bio_err,c->ssl);
    SSL_SESSION_print(bio_err, SSL_get_session(c->ssl));
    }

static void ssl_proceed_handshake(struct connection *c)
{
    int do_next = 1;

    while (do_next) {
        int ret, ecode;

        ret = SSL_do_handshake(c->ssl);
        ecode = SSL_get_error(c->ssl, ret);

        switch (ecode) {
        case SSL_ERROR_NONE:
            if (verbosity >= 2)
                ssl_print_info(c);
            if (ssl_info == NULL) {
                AB_SSL_CIPHER_CONST SSL_CIPHER *ci;
                X509 *cert;
                int sk_bits, pk_bits, swork;

                ci = SSL_get_current_cipher(c->ssl);
                sk_bits = SSL_CIPHER_get_bits(ci, &swork);
                cert = SSL_get_peer_certificate(c->ssl);
                if (cert)
                    pk_bits = EVP_PKEY_bits(X509_get_pubkey(cert));
                else
                    pk_bits = 0;  /* Anon DH */

                ssl_info = xmalloc(128);
                apr_snprintf(ssl_info, 128, "%s,%s,%d,%d",
                             SSL_get_version(c->ssl),
                             SSL_CIPHER_get_name(ci),
                             pk_bits, sk_bits);
            }
            if (ssl_tmp_key == NULL) {
                EVP_PKEY *key;
                if (SSL_get_server_tmp_key(c->ssl, &key)) {
                    ssl_tmp_key = xmalloc(128);
                    switch (EVP_PKEY_id(key)) {
                    case EVP_PKEY_RSA:
                        apr_snprintf(ssl_tmp_key, 128, "RSA %d bits",
                                     EVP_PKEY_bits(key));
                        break;
                    case EVP_PKEY_DH:
                        apr_snprintf(ssl_tmp_key, 128, "DH %d bits",
                                     EVP_PKEY_bits(key));
                        break;
#ifndef OPENSSL_NO_EC
                    case EVP_PKEY_EC: {
                        const char *cname = NULL;
                        EC_KEY *ec = EVP_PKEY_get1_EC_KEY(key);
                        int nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
                        EC_KEY_free(ec);
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
                        cname = EC_curve_nid2nist(nid);
#endif
                        if (!cname)
                            cname = OBJ_nid2sn(nid);

                        apr_snprintf(ssl_tmp_key, 128, "ECDH %s %d bits",
                                     cname,
                                     EVP_PKEY_bits(key));
                        break;
                        }
#endif
                    }
                    EVP_PKEY_free(key);
                }
            }
            write_request(c);
            do_next = 0;
            break;
        case SSL_ERROR_WANT_READ:
            set_polled_events(c, APR_POLLIN);
            do_next = 0;
            break;
        case SSL_ERROR_WANT_WRITE:
            /* Try again */
            do_next = 1;
            break;
        case SSL_ERROR_WANT_CONNECT:
        case SSL_ERROR_SSL:
        case SSL_ERROR_SYSCALL:
            /* Unexpected result */
            BIO_printf(bio_err, "SSL handshake failed (%d).\n", ecode);
            ERR_print_errors(bio_err);
            close_connection(c);
            do_next = 0;
            break;
        }
    }
}

#endif /* USE_SSL */

static void write_request(struct connection * c)
{
    if (started >= requests) {
        return;
    }

    do {
        apr_time_t tnow;
        apr_size_t l = c->rwrite;
        apr_status_t e = APR_SUCCESS; /* prevent gcc warning */

        tnow = lasttime = apr_time_now();

        /*
         * First time round ?
         */
        if (c->rwrite == 0) {
            apr_socket_timeout_set(c->aprsock, 0);
            c->connect = tnow;
            c->rwrote = 0;
            c->rwrite = reqlen;
            if (send_body)
                c->rwrite += postlen;
            l = c->rwrite;
        }
        else if (tnow > c->connect + aprtimeout) {
            printf("Send request timed out!\n");
            close_connection(c);
            return;
        }

#ifdef USE_SSL
        if (c->ssl) {
            apr_size_t e_ssl;
            e_ssl = SSL_write(c->ssl,request + c->rwrote, l);
            if (e_ssl != l) {
                BIO_printf(bio_err, "SSL write failed - closing connection\n");
                ERR_print_errors(bio_err);
                close_connection (c);
                return;
            }
            l = e_ssl;
            e = APR_SUCCESS;
        }
        else
#endif
            e = apr_socket_send(c->aprsock, request + c->rwrote, &l);

        if (e != APR_SUCCESS && !APR_STATUS_IS_EAGAIN(e)) {
            epipe++;
            printf("Send request failed!\n");
            close_connection(c);
            return;
        }
        totalposted += l;
        c->rwrote += l;
        c->rwrite -= l;
    } while (c->rwrite);

    c->endwrite = lasttime = apr_time_now();
    started++;
    set_conn_state(c, STATE_READ);
}

/* --------------------------------------------------------- */

/* calculate and output results */

static int compradre(struct data * a, struct data * b)
{
    if ((a->ctime) < (b->ctime))
        return -1;
    if ((a->ctime) > (b->ctime))
        return +1;
    return 0;
}

static int comprando(struct data * a, struct data * b)
{
    if ((a->time) < (b->time))
        return -1;
    if ((a->time) > (b->time))
        return +1;
    return 0;
}

static int compri(struct data * a, struct data * b)
{
    apr_interval_time_t p = a->time - a->ctime;
    apr_interval_time_t q = b->time - b->ctime;
    if (p < q)
        return -1;
    if (p > q)
        return +1;
    return 0;
}

static int compwait(struct data * a, struct data * b)
{
    if ((a->waittime) < (b->waittime))
        return -1;
    if ((a->waittime) > (b->waittime))
        return 1;
    return 0;
}

static void output_results(int sig)
{
    double timetaken;

    if (sig) {
        lasttime = apr_time_now();  /* record final time if interrupted */
    }
    timetaken = (double) (lasttime - start) / APR_USEC_PER_SEC;

    printf("\n\n");
    printf("Server Software:        %s\n", servername);
    printf("Server Hostname:        %s\n", hostname);
    printf("Server Port:            %hu\n", port);
#ifdef USE_SSL
    if (is_ssl && ssl_info) {
        printf("SSL/TLS Protocol:       %s\n", ssl_info);
    }
    if (is_ssl && ssl_tmp_key) {
        printf("Server Temp Key:        %s\n", ssl_tmp_key);
    }
#ifdef HAVE_TLSEXT
    if (is_ssl && tls_sni) {
        printf("TLS Server Name:        %s\n", tls_sni);
    }
#endif
#endif
    printf("\n");
    printf("Document Path:          %s\n", path);
    if (nolength)
        printf("Document Length:        Variable\n");
    else
        printf("Document Length:        %" APR_SIZE_T_FMT " bytes\n", doclen);
    printf("\n");
    printf("Concurrency Level:      %d\n", concurrency);
    printf("Time taken for tests:   %.3f seconds\n", timetaken);
    printf("Complete requests:      %d\n", done);
    printf("Failed requests:        %d\n", bad);
    if (bad)
        printf("   (Connect: %d, Receive: %d, Length: %d, Exceptions: %d)\n",
            err_conn, err_recv, err_length, err_except);
    if (epipe)
        printf("Write errors:           %d\n", epipe);
    if (err_response)
        printf("Non-2xx responses:      %d\n", err_response);
    if (keepalive)
        printf("Keep-Alive requests:    %d\n", doneka);
    printf("Total transferred:      %" APR_INT64_T_FMT " bytes\n", totalread);
    if (send_body)
        printf("Total body sent:        %" APR_INT64_T_FMT "\n",
               totalposted);
    printf("HTML transferred:       %" APR_INT64_T_FMT " bytes\n", totalbread);

    /* avoid divide by zero */
    if (timetaken && done) {
        printf("Requests per second:    %.2f [#/sec] (mean)\n",
               (double) done / timetaken);
        printf("Time per request:       %.3f [ms] (mean)\n",
               (double) concurrency * timetaken * 1000 / done);
        printf("Time per request:       %.3f [ms] (mean, across all concurrent requests)\n",
               (double) timetaken * 1000 / done);
        printf("Transfer rate:          %.2f [Kbytes/sec] received\n",
               (double) totalread / 1024 / timetaken);
        if (send_body) {
            printf("                        %.2f kb/s sent\n",
               (double) totalposted / 1024 / timetaken);
            printf("                        %.2f kb/s total\n",
               (double) (totalread + totalposted) / 1024 / timetaken);
        }
    }

    if (done > 0) {
        /* work out connection times */
        int i;
        apr_time_t totalcon = 0, total = 0, totald = 0, totalwait = 0;
        apr_time_t meancon, meantot, meand, meanwait;
        apr_interval_time_t mincon = AB_MAX, mintot = AB_MAX, mind = AB_MAX,
                            minwait = AB_MAX;
        apr_interval_time_t maxcon = 0, maxtot = 0, maxd = 0, maxwait = 0;
        apr_interval_time_t mediancon = 0, mediantot = 0, mediand = 0, medianwait = 0;
        double sdtot = 0, sdcon = 0, sdd = 0, sdwait = 0;

        for (i = 0; i < done; i++) {
            struct data *s = &stats[i];
            mincon = ap_min(mincon, s->ctime);
            mintot = ap_min(mintot, s->time);
            mind = ap_min(mind, s->time - s->ctime);
            minwait = ap_min(minwait, s->waittime);

            maxcon = ap_max(maxcon, s->ctime);
            maxtot = ap_max(maxtot, s->time);
            maxd = ap_max(maxd, s->time - s->ctime);
            maxwait = ap_max(maxwait, s->waittime);

            totalcon += s->ctime;
            total += s->time;
            totald += s->time - s->ctime;
            totalwait += s->waittime;
        }
        meancon = totalcon / done;
        meantot = total / done;
        meand = totald / done;
        meanwait = totalwait / done;

        /* calculating the sample variance: the sum of the squared deviations, divided by n-1 */
        for (i = 0; i < done; i++) {
            struct data *s = &stats[i];
            double a;
            a = ((double)s->time - meantot);
            sdtot += a * a;
            a = ((double)s->ctime - meancon);
            sdcon += a * a;
            a = ((double)s->time - (double)s->ctime - meand);
            sdd += a * a;
            a = ((double)s->waittime - meanwait);
            sdwait += a * a;
        }

        sdtot = (done > 1) ? sqrt(sdtot / (done - 1)) : 0;
        sdcon = (done > 1) ? sqrt(sdcon / (done - 1)) : 0;
        sdd = (done > 1) ? sqrt(sdd / (done - 1)) : 0;
        sdwait = (done > 1) ? sqrt(sdwait / (done - 1)) : 0;

        /*
         * XXX: what is better; this hideous cast of the compradre function; or
         * the four warnings during compile ? dirkx just does not know and
         * hates both/
         */
        qsort(stats, done, sizeof(struct data),
              (int (*) (const void *, const void *)) compradre);
        if ((done > 1) && (done % 2))
            mediancon = (stats[done / 2].ctime + stats[done / 2 + 1].ctime) / 2;
        else
            mediancon = stats[done / 2].ctime;

        qsort(stats, done, sizeof(struct data),
              (int (*) (const void *, const void *)) compri);
        if ((done > 1) && (done % 2))
            mediand = (stats[done / 2].time + stats[done / 2 + 1].time \
            -stats[done / 2].ctime - stats[done / 2 + 1].ctime) / 2;
        else
            mediand = stats[done / 2].time - stats[done / 2].ctime;

        qsort(stats, done, sizeof(struct data),
              (int (*) (const void *, const void *)) compwait);
        if ((done > 1) && (done % 2))
            medianwait = (stats[done / 2].waittime + stats[done / 2 + 1].waittime) / 2;
        else
            medianwait = stats[done / 2].waittime;

        qsort(stats, done, sizeof(struct data),
              (int (*) (const void *, const void *)) comprando);
        if ((done > 1) && (done % 2))
            mediantot = (stats[done / 2].time + stats[done / 2 + 1].time) / 2;
        else
            mediantot = stats[done / 2].time;

        printf("\nConnection Times (ms)\n");
        /*
         * Reduce stats from apr time to milliseconds
         */
        mincon     = ap_round_ms(mincon);
        mind       = ap_round_ms(mind);
        minwait    = ap_round_ms(minwait);
        mintot     = ap_round_ms(mintot);
        meancon    = ap_round_ms(meancon);
        meand      = ap_round_ms(meand);
        meanwait   = ap_round_ms(meanwait);
        meantot    = ap_round_ms(meantot);
        mediancon  = ap_round_ms(mediancon);
        mediand    = ap_round_ms(mediand);
        medianwait = ap_round_ms(medianwait);
        mediantot  = ap_round_ms(mediantot);
        maxcon     = ap_round_ms(maxcon);
        maxd       = ap_round_ms(maxd);
        maxwait    = ap_round_ms(maxwait);
        maxtot     = ap_round_ms(maxtot);
        sdcon      = ap_double_ms(sdcon);
        sdd        = ap_double_ms(sdd);
        sdwait     = ap_double_ms(sdwait);
        sdtot      = ap_double_ms(sdtot);

        if (confidence) {
#define CONF_FMT_STRING "%5" APR_TIME_T_FMT " %4" APR_TIME_T_FMT " %5.1f %6" APR_TIME_T_FMT " %7" APR_TIME_T_FMT "\n"
            printf("              min  mean[+/-sd] median   max\n");
            printf("Connect:    " CONF_FMT_STRING,
                   mincon, meancon, sdcon, mediancon, maxcon);
            printf("Processing: " CONF_FMT_STRING,
                   mind, meand, sdd, mediand, maxd);
            printf("Waiting:    " CONF_FMT_STRING,
                   minwait, meanwait, sdwait, medianwait, maxwait);
            printf("Total:      " CONF_FMT_STRING,
                   mintot, meantot, sdtot, mediantot, maxtot);
#undef CONF_FMT_STRING

#define     SANE(what,mean,median,sd) \
              { \
                double d = (double)mean - median; \
                if (d < 0) d = -d; \
                if (d > 2 * sd ) \
                    printf("ERROR: The median and mean for " what " are more than twice the standard\n" \
                           "       deviation apart. These results are NOT reliable.\n"); \
                else if (d > sd ) \
                    printf("WARNING: The median and mean for " what " are not within a normal deviation\n" \
                           "        These results are probably not that reliable.\n"); \
            }
            SANE("the initial connection time", meancon, mediancon, sdcon);
            SANE("the processing time", meand, mediand, sdd);
            SANE("the waiting time", meanwait, medianwait, sdwait);
            SANE("the total time", meantot, mediantot, sdtot);
        }
        else {
            printf("              min   avg   max\n");
#define CONF_FMT_STRING "%5" APR_TIME_T_FMT " %5" APR_TIME_T_FMT "%5" APR_TIME_T_FMT "\n"
            printf("Connect:    " CONF_FMT_STRING, mincon, meancon, maxcon);
            printf("Processing: " CONF_FMT_STRING, mind, meand, maxd);
            printf("Waiting:    " CONF_FMT_STRING, minwait, meanwait, maxwait);
            printf("Total:      " CONF_FMT_STRING, mintot, meantot, maxtot);
#undef CONF_FMT_STRING
        }


        /* Sorted on total connect times */
        if (percentile && (done > 1)) {
            printf("\nPercentage of the requests served within a certain time (ms)\n");
            for (i = 0; i < sizeof(percs) / sizeof(int); i++) {
                if (percs[i] <= 0)
                    printf(" 0%%  <0> (never)\n");
                else if (percs[i] >= 100)
                    printf(" 100%%  %5" APR_TIME_T_FMT " (longest request)\n",
                           ap_round_ms(stats[done - 1].time));
                else
                    printf("  %d%%  %5" APR_TIME_T_FMT "\n", percs[i],
                           ap_round_ms(stats[(unsigned long)done * percs[i] / 100].time));
            }
        }
        if (csvperc) {
            FILE *out = fopen(csvperc, "w");
            if (!out) {
                perror("Cannot open CSV output file");
                exit(1);
            }
            fprintf(out, "" "Percentage served" "," "Time in ms" "\n");
            for (i = 0; i <= 100; i++) {
                double t;
                if (i == 0)
                    t = ap_double_ms(stats[0].time);
                else if (i == 100)
                    t = ap_double_ms(stats[done - 1].time);
                else
                    t = ap_double_ms(stats[(unsigned long) (0.5 + (double)done * i / 100.0)].time);
                fprintf(out, "%d,%.3f\n", i, t);
            }
            fclose(out);
        }
        if (gnuplot) {
            FILE *out = fopen(gnuplot, "w");
            char tmstring[APR_CTIME_LEN];
            if (!out) {
                perror("Cannot open gnuplot output file");
                exit(1);
            }
            fprintf(out, "starttime\tseconds\tctime\tdtime\tttime\twait\n");
            for (i = 0; i < done; i++) {
                (void) apr_ctime(tmstring, stats[i].starttime);
                fprintf(out, "%s\t%" APR_TIME_T_FMT "\t%" APR_TIME_T_FMT
                               "\t%" APR_TIME_T_FMT "\t%" APR_TIME_T_FMT
                               "\t%" APR_TIME_T_FMT "\n", tmstring,
                        apr_time_sec(stats[i].starttime),
                        ap_round_ms(stats[i].ctime),
                        ap_round_ms(stats[i].time - stats[i].ctime),
                        ap_round_ms(stats[i].time),
                        ap_round_ms(stats[i].waittime));
            }
            fclose(out);
        }
    }

    if (sig) {
        exit(1);
    }
}

/* --------------------------------------------------------- */

/* calculate and output results in HTML  */

static void output_html_results(void)
{
    double timetaken = (double) (lasttime - start) / APR_USEC_PER_SEC;

    printf("\n\n<table %s>\n", tablestring);
    printf("<tr %s><th colspan=2 %s>Server Software:</th>"
       "<td colspan=2 %s>%s</td></tr>\n",
       trstring, tdstring, tdstring, servername);
    printf("<tr %s><th colspan=2 %s>Server Hostname:</th>"
       "<td colspan=2 %s>%s</td></tr>\n",
       trstring, tdstring, tdstring, hostname);
    printf("<tr %s><th colspan=2 %s>Server Port:</th>"
       "<td colspan=2 %s>%hu</td></tr>\n",
       trstring, tdstring, tdstring, port);
    printf("<tr %s><th colspan=2 %s>Document Path:</th>"
       "<td colspan=2 %s>%s</td></tr>\n",
       trstring, tdstring, tdstring, path);
    if (nolength)
        printf("<tr %s><th colspan=2 %s>Document Length:</th>"
            "<td colspan=2 %s>Variable</td></tr>\n",
            trstring, tdstring, tdstring);
    else
        printf("<tr %s><th colspan=2 %s>Document Length:</th>"
            "<td colspan=2 %s>%" APR_SIZE_T_FMT " bytes</td></tr>\n",
            trstring, tdstring, tdstring, doclen);
    printf("<tr %s><th colspan=2 %s>Concurrency Level:</th>"
       "<td colspan=2 %s>%d</td></tr>\n",
       trstring, tdstring, tdstring, concurrency);
    printf("<tr %s><th colspan=2 %s>Time taken for tests:</th>"
       "<td colspan=2 %s>%.3f seconds</td></tr>\n",
       trstring, tdstring, tdstring, timetaken);
    printf("<tr %s><th colspan=2 %s>Complete requests:</th>"
       "<td colspan=2 %s>%d</td></tr>\n",
       trstring, tdstring, tdstring, done);
    printf("<tr %s><th colspan=2 %s>Failed requests:</th>"
       "<td colspan=2 %s>%d</td></tr>\n",
       trstring, tdstring, tdstring, bad);
    if (bad)
        printf("<tr %s><td colspan=4 %s >   (Connect: %d, Length: %d, Exceptions: %d)</td></tr>\n",
           trstring, tdstring, err_conn, err_length, err_except);
    if (err_response)
        printf("<tr %s><th colspan=2 %s>Non-2xx responses:</th>"
           "<td colspan=2 %s>%d</td></tr>\n",
           trstring, tdstring, tdstring, err_response);
    if (keepalive)
        printf("<tr %s><th colspan=2 %s>Keep-Alive requests:</th>"
           "<td colspan=2 %s>%d</td></tr>\n",
           trstring, tdstring, tdstring, doneka);
    printf("<tr %s><th colspan=2 %s>Total transferred:</th>"
       "<td colspan=2 %s>%" APR_INT64_T_FMT " bytes</td></tr>\n",
       trstring, tdstring, tdstring, totalread);
    if (send_body)
        printf("<tr %s><th colspan=2 %s>Total body sent:</th>"
           "<td colspan=2 %s>%" APR_INT64_T_FMT "</td></tr>\n",
           trstring, tdstring,
           tdstring, totalposted);
    printf("<tr %s><th colspan=2 %s>HTML transferred:</th>"
       "<td colspan=2 %s>%" APR_INT64_T_FMT " bytes</td></tr>\n",
       trstring, tdstring, tdstring, totalbread);

    /* avoid divide by zero */
    if (timetaken) {
        printf("<tr %s><th colspan=2 %s>Requests per second:</th>"
           "<td colspan=2 %s>%.2f</td></tr>\n",
           trstring, tdstring, tdstring, (double) done / timetaken);
        printf("<tr %s><th colspan=2 %s>Transfer rate:</th>"
           "<td colspan=2 %s>%.2f kb/s received</td></tr>\n",
           trstring, tdstring, tdstring, (double) totalread / 1024 / timetaken);
        if (send_body) {
            printf("<tr %s><td colspan=2 %s>&nbsp;</td>"
               "<td colspan=2 %s>%.2f kb/s sent</td></tr>\n",
               trstring, tdstring, tdstring,
               (double) totalposted / 1024 / timetaken);
            printf("<tr %s><td colspan=2 %s>&nbsp;</td>"
               "<td colspan=2 %s>%.2f kb/s total</td></tr>\n",
               trstring, tdstring, tdstring,
               (double) (totalread + totalposted) / 1024 / timetaken);
        }
    }
    {
        /* work out connection times */
        int i;
        apr_interval_time_t totalcon = 0, total = 0;
        apr_interval_time_t mincon = AB_MAX, mintot = AB_MAX;
        apr_interval_time_t maxcon = 0, maxtot = 0;

        for (i = 0; i < done; i++) {
            struct data *s = &stats[i];
            mincon = ap_min(mincon, s->ctime);
            mintot = ap_min(mintot, s->time);
            maxcon = ap_max(maxcon, s->ctime);
            maxtot = ap_max(maxtot, s->time);
            totalcon += s->ctime;
            total    += s->time;
        }
        /*
         * Reduce stats from apr time to milliseconds
         */
        mincon   = ap_round_ms(mincon);
        mintot   = ap_round_ms(mintot);
        maxcon   = ap_round_ms(maxcon);
        maxtot   = ap_round_ms(maxtot);
        totalcon = ap_round_ms(totalcon);
        total    = ap_round_ms(total);

        if (done > 0) { /* avoid division by zero (if 0 done) */
            printf("<tr %s><th %s colspan=4>Connnection Times (ms)</th></tr>\n",
               trstring, tdstring);
            printf("<tr %s><th %s>&nbsp;</th> <th %s>min</th>   <th %s>avg</th>   <th %s>max</th></tr>\n",
               trstring, tdstring, tdstring, tdstring, tdstring);
            printf("<tr %s><th %s>Connect:</th>"
               "<td %s>%5" APR_TIME_T_FMT "</td>"
               "<td %s>%5" APR_TIME_T_FMT "</td>"
               "<td %s>%5" APR_TIME_T_FMT "</td></tr>\n",
               trstring, tdstring, tdstring, mincon, tdstring, totalcon / done, tdstring, maxcon);
            printf("<tr %s><th %s>Processing:</th>"
               "<td %s>%5" APR_TIME_T_FMT "</td>"
               "<td %s>%5" APR_TIME_T_FMT "</td>"
               "<td %s>%5" APR_TIME_T_FMT "</td></tr>\n",
               trstring, tdstring, tdstring, mintot - mincon, tdstring,
               (total / done) - (totalcon / done), tdstring, maxtot - maxcon);
            printf("<tr %s><th %s>Total:</th>"
               "<td %s>%5" APR_TIME_T_FMT "</td>"
               "<td %s>%5" APR_TIME_T_FMT "</td>"
               "<td %s>%5" APR_TIME_T_FMT "</td></tr>\n",
               trstring, tdstring, tdstring, mintot, tdstring, total / done, tdstring, maxtot);
        }
        printf("</table>\n");
    }
}

/* --------------------------------------------------------- */

/* start asnchronous non-blocking connection */

static void start_connect(struct connection * c)
{
    apr_status_t rv;

    if (!(started < requests))
        return;

    c->read = 0;
    c->bread = 0;
    c->keepalive = 0;
    c->cbx = 0;
    c->gotheader = 0;
    c->rwrite = 0;
    if (c->ctx)
        apr_pool_clear(c->ctx);
    else
        apr_pool_create(&c->ctx, cntxt);

    if ((rv = apr_socket_create(&c->aprsock, destsa->family,
                SOCK_STREAM, 0, c->ctx)) != APR_SUCCESS) {
    apr_err("socket", rv);
    }

    if (myhost) {
        if ((rv = apr_socket_bind(c->aprsock, mysa)) != APR_SUCCESS) {
            apr_err("bind", rv);
        }
    }

    c->pollfd.desc_type = APR_POLL_SOCKET;
    c->pollfd.desc.s = c->aprsock;
    c->pollfd.reqevents = 0;
    c->pollfd.client_data = c;

    if ((rv = apr_socket_opt_set(c->aprsock, APR_SO_NONBLOCK, 1))
         != APR_SUCCESS) {
        apr_err("socket nonblock", rv);
    }

    if (windowsize != 0) {
        rv = apr_socket_opt_set(c->aprsock, APR_SO_SNDBUF,
                                windowsize);
        if (rv != APR_SUCCESS && rv != APR_ENOTIMPL) {
            apr_err("socket send buffer", rv);
        }
        rv = apr_socket_opt_set(c->aprsock, APR_SO_RCVBUF,
                                windowsize);
        if (rv != APR_SUCCESS && rv != APR_ENOTIMPL) {
            apr_err("socket receive buffer", rv);
        }
    }

    c->start = lasttime = apr_time_now();
#ifdef USE_SSL
    if (is_ssl) {
        BIO *bio;
        apr_os_sock_t fd;

        if ((c->ssl = SSL_new(ssl_ctx)) == NULL) {
            BIO_printf(bio_err, "SSL_new failed.\n");
            ERR_print_errors(bio_err);
            exit(1);
        }
        ssl_rand_seed();
        apr_os_sock_get(&fd, c->aprsock);
        bio = BIO_new_socket(fd, BIO_NOCLOSE);
        SSL_set_bio(c->ssl, bio, bio);
        SSL_set_connect_state(c->ssl);
        if (verbosity >= 4) {
            BIO_set_callback(bio, ssl_print_cb);
            BIO_set_callback_arg(bio, (void *)bio_err);
        }
#ifdef HAVE_TLSEXT
        if (tls_sni) {
            SSL_set_tlsext_host_name(c->ssl, tls_sni);
        }
#endif
    } else {
        c->ssl = NULL;
    }
#endif
    if ((rv = apr_socket_connect(c->aprsock, destsa)) != APR_SUCCESS) {
        if (APR_STATUS_IS_EINPROGRESS(rv)) {
            set_conn_state(c, STATE_CONNECTING);
            c->rwrite = 0;
            return;
        }
        else {
            set_conn_state(c, STATE_UNCONNECTED);
            apr_socket_close(c->aprsock);
            if (good == 0 && destsa->next) {
                destsa = destsa->next;
                err_conn = 0;
            }
            else if (bad++ > 10) {
                fprintf(stderr,
                   "\nTest aborted after 10 failures\n\n");
                apr_err("apr_socket_connect()", rv);
            }
            else {
                err_conn++;
            }

            start_connect(c);
            return;
        }
    }

    /* connected first time */
    set_conn_state(c, STATE_CONNECTED);
#ifdef USE_SSL
    if (c->ssl) {
        ssl_proceed_handshake(c);
    } else
#endif
    {
        write_request(c);
    }
}

/* --------------------------------------------------------- */

/* close down connection and save stats */

static void close_connection(struct connection * c)
{
    if (c->read == 0 && c->keepalive) {
        /*
         * server has legitimately shut down an idle keep alive request
         */
        if (good)
            good--;     /* connection never happened */
    }
    else {
        if (good == 1) {
            /* first time here */
            doclen = c->bread;
        }
        else if ((c->bread != doclen) && !nolength) {
            bad++;
            err_length++;
        }
        /* save out time */
        if (done < requests) {
            struct data *s = &stats[done++];
            c->done      = lasttime = apr_time_now();
            s->starttime = c->start;
            s->ctime     = ap_max(0, c->connect - c->start);
            s->time      = ap_max(0, c->done - c->start);
            s->waittime  = ap_max(0, c->beginread - c->endwrite);
            if (heartbeatres && !(done % heartbeatres)) {
                fprintf(stderr, "Completed %d requests\n", done);
                fflush(stderr);
            }
        }
    }

    set_conn_state(c, STATE_UNCONNECTED);
#ifdef USE_SSL
    if (c->ssl) {
        SSL_shutdown(c->ssl);
        SSL_free(c->ssl);
        c->ssl = NULL;
    }
#endif
    apr_socket_close(c->aprsock);

    /* connect again */
    start_connect(c);
    return;
}

/* --------------------------------------------------------- */

/* read data from connection */

static void read_connection(struct connection * c)
{
    apr_size_t r;
    apr_status_t status;
    char *part;
    char respcode[4];       /* 3 digits and null */
    int i;

    r = sizeof(buffer);
read_more:
#ifdef USE_SSL
    if (c->ssl) {
        status = SSL_read(c->ssl, buffer, r);
        if (status <= 0) {
            int scode = SSL_get_error(c->ssl, status);

            if (scode == SSL_ERROR_ZERO_RETURN) {
                /* connection closed cleanly: */
                good++;
                close_connection(c);
            }
            else if (scode == SSL_ERROR_SYSCALL
                     && status == 0
                     && c->read != 0) {
                /* connection closed, but in violation of the protocol, after
                 * some data has already been read; this commonly happens, so
                 * let the length check catch any response errors
                 */
                good++;
                close_connection(c);
            }
            else if (scode == SSL_ERROR_SYSCALL 
                     && c->read == 0
                     && destsa->next
                     && c->state == STATE_CONNECTING
                     && good == 0) {
                return;
            }
            else if (scode != SSL_ERROR_WANT_WRITE
                     && scode != SSL_ERROR_WANT_READ) {
                /* some fatal error: */
                c->read = 0;
                BIO_printf(bio_err, "SSL read failed (%d) - closing connection\n", scode);
                ERR_print_errors(bio_err);
                close_connection(c);
            }
            return;
        }
        r = status;
    }
    else
#endif
    {
        status = apr_socket_recv(c->aprsock, buffer, &r);
        if (APR_STATUS_IS_EAGAIN(status))
            return;
        else if (r == 0 && APR_STATUS_IS_EOF(status)) {
            good++;
            close_connection(c);
            return;
        }
        /* catch legitimate fatal apr_socket_recv errors */
        else if (status != APR_SUCCESS) {
            if (recverrok) {
                err_recv++;
                bad++;
                close_connection(c);
                if (verbosity >= 1) {
                    char buf[120];
                    fprintf(stderr,"%s: %s (%d)\n", "apr_socket_recv", apr_strerror(status, buf, sizeof buf), status);
                }
                return;
            } else if (destsa->next && c->state == STATE_CONNECTING
                       && c->read == 0 && good == 0) {
                return;
            }
            else {
                err_recv++;
                apr_err("apr_socket_recv", status);
            }
        }
    }

    totalread += r;
    if (c->read == 0) {
        c->beginread = apr_time_now();
    }
    c->read += r;


    if (!c->gotheader) {
        char *s;
        int l = 4;
        apr_size_t space = CBUFFSIZE - c->cbx - 1; /* -1 allows for \0 term */
        int tocopy = (space < r) ? space : r;
#ifdef NOT_ASCII
        apr_size_t inbytes_left = space, outbytes_left = space;

        status = apr_xlate_conv_buffer(from_ascii, buffer, &inbytes_left,
                           c->cbuff + c->cbx, &outbytes_left);
        if (status || inbytes_left || outbytes_left) {
            fprintf(stderr, "only simple translation is supported (%d/%" APR_SIZE_T_FMT
                            "/%" APR_SIZE_T_FMT ")\n", status, inbytes_left, outbytes_left);
            exit(1);
        }
#else
        memcpy(c->cbuff + c->cbx, buffer, space);
#endif              /* NOT_ASCII */
        c->cbx += tocopy;
        space -= tocopy;
        c->cbuff[c->cbx] = 0;   /* terminate for benefit of strstr */
        if (verbosity >= 2) {
            printf("LOG: header received:\n%s\n", c->cbuff);
        }
        s = strstr(c->cbuff, "\r\n\r\n");
        /*
         * this next line is so that we talk to NCSA 1.5 which blatantly
         * breaks the http specifaction
         */
        if (!s) {
            s = strstr(c->cbuff, "\n\n");
            l = 2;
        }

        if (!s) {
            /* read rest next time */
            if (space) {
                return;
            }
            else {
            /* header is in invalid or too big - close connection */
                set_conn_state(c, STATE_UNCONNECTED);
                apr_socket_close(c->aprsock);
                err_response++;
                if (bad++ > 10) {
                    err("\nTest aborted after 10 failures\n\n");
                }
                start_connect(c);
            }
        }
        else {
            /* have full header */
            if (!good) {
                /*
                 * this is first time, extract some interesting info
                 */
                char *p, *q;
                size_t len = 0;
                p = xstrcasestr(c->cbuff, "Server:");
                q = servername;
                if (p) {
                    p += 8;
                    /* -1 to not overwrite last '\0' byte */
                    while (*p > 32 && len++ < sizeof(servername) - 1)
                        *q++ = *p++;
                }
                *q = 0;
            }
            /*
             * XXX: this parsing isn't even remotely HTTP compliant... but in
             * the interest of speed it doesn't totally have to be, it just
             * needs to be extended to handle whatever servers folks want to
             * test against. -djg
             */

            /* check response code */
            part = strstr(c->cbuff, "HTTP");    /* really HTTP/1.x_ */
            if (part && strlen(part) > strlen("HTTP/1.x_")) {
                strncpy(respcode, (part + strlen("HTTP/1.x_")), 3);
                respcode[3] = '\0';
            }
            else {
                strcpy(respcode, "500");
            }

            if (respcode[0] != '2') {
                err_response++;
                if (verbosity >= 2)
                    printf("WARNING: Response code not 2xx (%s)\n", respcode);
            }
            else if (verbosity >= 3) {
                printf("LOG: Response code = %s\n", respcode);
            }
            c->gotheader = 1;
            *s = 0;     /* terminate at end of header */
            if (keepalive && xstrcasestr(c->cbuff, "Keep-Alive")) {
                char *cl;
                c->keepalive = 1;
                cl = xstrcasestr(c->cbuff, "Content-Length:");
                if (cl && method != HEAD) {
                    /* response to HEAD doesn't have entity body */
                    c->length = atoi(cl + 16);
                }
                else {
                    c->length = 0;
                }
            }
            c->bread += c->cbx - (s + l - c->cbuff) + r - tocopy;
            totalbread += c->bread;

            /* We have received the header, so we know this destination socket
             * address is working, so initialize all remaining requests. */
            if (!requests_initialized) {
                for (i = 1; i < concurrency; i++) {
                    con[i].socknum = i;
                    start_connect(&con[i]);
                }
                requests_initialized = 1;
            }
        }
    }
    else {
        /* outside header, everything we have read is entity body */
        c->bread += r;
        totalbread += r;
    }
    if (r == sizeof(buffer) && c->bread < c->length) {
        /* read was full, try more immediately (nonblocking already) */
        goto read_more;
    }

    if (c->keepalive && (c->bread >= c->length)) {
        /* finished a keep-alive connection */
        good++;
        /* save out time */
        if (good == 1) {
            /* first time here */
            doclen = c->bread;
        }
        else if ((c->bread != doclen) && !nolength) {
            bad++;
            err_length++;
        }
        if (done < requests) {
            struct data *s = &stats[done++];
            doneka++;
            c->done      = apr_time_now();
            s->starttime = c->start;
            s->ctime     = ap_max(0, c->connect - c->start);
            s->time      = ap_max(0, c->done - c->start);
            s->waittime  = ap_max(0, c->beginread - c->endwrite);
            if (heartbeatres && !(done % heartbeatres)) {
                fprintf(stderr, "Completed %d requests\n", done);
                fflush(stderr);
            }
        }
        c->keepalive = 0;
        c->length = 0;
        c->gotheader = 0;
        c->cbx = 0;
        c->read = c->bread = 0;
        /* zero connect time with keep-alive */
        c->start = c->connect = lasttime = apr_time_now();
        write_request(c);
    }
}

/* --------------------------------------------------------- */

/* run the tests */

static void test(void)
{
    apr_time_t stoptime;
    apr_int16_t rtnev;
    apr_status_t rv;
    int i;
    apr_status_t status;
    int snprintf_res = 0;
#ifdef NOT_ASCII
    apr_size_t inbytes_left, outbytes_left;
#endif

    if (isproxy) {
        connecthost = apr_pstrdup(cntxt, proxyhost);
        connectport = proxyport;
    }
    else {
        connecthost = apr_pstrdup(cntxt, hostname);
        connectport = port;
    }

    if (!use_html) {
        printf("Benchmarking %s ", hostname);
    if (isproxy)
        printf("[through %s:%d] ", proxyhost, proxyport);
    printf("(be patient)%s",
           (heartbeatres ? "\n" : "..."));
    fflush(stdout);
    }

    con = xcalloc(concurrency, sizeof(struct connection));

    /*
     * XXX: a way to calculate the stats without requiring O(requests) memory
     * XXX: would be nice.
     */
    stats = xcalloc(requests, sizeof(struct data));

    if ((status = apr_pollset_create(&readbits, concurrency, cntxt,
                                     APR_POLLSET_NOCOPY)) != APR_SUCCESS) {
        apr_err("apr_pollset_create failed", status);
    }

    /* add default headers if necessary */
    if (!opt_host) {
        /* Host: header not overridden, add default value to hdrs */
        hdrs = apr_pstrcat(cntxt, hdrs, "Host: ", host_field, colonhost, "\r\n", NULL);
    }
    else {
        /* Header overridden, no need to add, as it is already in hdrs */
    }

#ifdef HAVE_TLSEXT
    if (is_ssl && tls_use_sni) {
        apr_ipsubnet_t *ip;
        if (((tls_sni = opt_host) || (tls_sni = hostname)) &&
            (!*tls_sni || apr_ipsubnet_create(&ip, tls_sni, NULL,
                                               cntxt) == APR_SUCCESS)) {
            /* IP not allowed in TLS SNI extension */
            tls_sni = NULL;
        }
    }
#endif

    if (!opt_useragent) {
        /* User-Agent: header not overridden, add default value to hdrs */
        hdrs = apr_pstrcat(cntxt, hdrs, "User-Agent: ApacheBench/", AP_AB_BASEREVISION, "\r\n", NULL);
    }
    else {
        /* Header overridden, no need to add, as it is already in hdrs */
    }

    if (!opt_accept) {
        /* Accept: header not overridden, add default value to hdrs */
        hdrs = apr_pstrcat(cntxt, hdrs, "Accept: */*\r\n", NULL);
    }
    else {
        /* Header overridden, no need to add, as it is already in hdrs */
    }

    /* setup request */
    if (!send_body) {
        snprintf_res = apr_snprintf(request, sizeof(_request),
            "%s %s HTTP/1.0\r\n"
            "%s" "%s" "%s"
            "%s" "\r\n",
            method_str[method],
            (isproxy) ? fullurl : path,
            keepalive ? "Connection: Keep-Alive\r\n" : "",
            cookie, auth, hdrs);
    }
    else {
        snprintf_res = apr_snprintf(request,  sizeof(_request),
            "%s %s HTTP/1.0\r\n"
            "%s" "%s" "%s"
            "Content-length: %" APR_SIZE_T_FMT "\r\n"
            "Content-type: %s\r\n"
            "%s"
            "\r\n",
            method_str[method],
            (isproxy) ? fullurl : path,
            keepalive ? "Connection: Keep-Alive\r\n" : "",
            cookie, auth,
            postlen,
            (content_type != NULL) ? content_type : "text/plain", hdrs);
    }
    if (snprintf_res >= sizeof(_request)) {
        err("Request too long\n");
    }

    if (verbosity >= 2)
        printf("INFO: %s header == \n---\n%s\n---\n",
               method_str[method], request);

    reqlen = strlen(request);

    /*
     * Combine headers and (optional) post file into one continuous buffer
     */
    if (send_body) {
        char *buff = xmalloc(postlen + reqlen + 1);
        strcpy(buff, request);
        memcpy(buff + reqlen, postdata, postlen);
        request = buff;
    }

#ifdef NOT_ASCII
    inbytes_left = outbytes_left = reqlen;
    status = apr_xlate_conv_buffer(to_ascii, request, &inbytes_left,
                   request, &outbytes_left);
    if (status || inbytes_left || outbytes_left) {
        fprintf(stderr, "only simple translation is supported (%d/%"
                        APR_SIZE_T_FMT "/%" APR_SIZE_T_FMT ")\n",
                        status, inbytes_left, outbytes_left);
        exit(1);
    }
#endif              /* NOT_ASCII */

    if (myhost) {
        /* This only needs to be done once */
        if ((rv = apr_sockaddr_info_get(&mysa, myhost, APR_UNSPEC, 0, 0, cntxt)) != APR_SUCCESS) {
            char buf[120];
            apr_snprintf(buf, sizeof(buf),
                         "apr_sockaddr_info_get() for %s", myhost);
            apr_err(buf, rv);
        }
    }

    /* This too */
    if ((rv = apr_sockaddr_info_get(&destsa, connecthost,
                                    myhost ? mysa->family : APR_UNSPEC,
                                    connectport, 0, cntxt))
       != APR_SUCCESS) {
        char buf[120];
        apr_snprintf(buf, sizeof(buf),
                 "apr_sockaddr_info_get() for %s", connecthost);
        apr_err(buf, rv);
    }

    /* ok - lets start */
    start = lasttime = apr_time_now();
    stoptime = tlimit ? (start + apr_time_from_sec(tlimit)) : AB_MAX;

#ifdef SIGINT
    /* Output the results if the user terminates the run early. */
    apr_signal(SIGINT, output_results);
#endif

    /* initialise first connection to determine destination socket address
     * which should be used for next connections. */
    con[0].socknum = 0;
    start_connect(&con[0]);

    do {
        apr_int32_t n;
        const apr_pollfd_t *pollresults, *pollfd;

        n = concurrency;
        do {
            status = apr_pollset_poll(readbits, aprtimeout, &n, &pollresults);
        } while (APR_STATUS_IS_EINTR(status));
        if (status != APR_SUCCESS)
            apr_err("apr_pollset_poll", status);

        for (i = 0, pollfd = pollresults; i < n; i++, pollfd++) {
            struct connection *c;

            c = pollfd->client_data;

            /*
             * If the connection isn't connected how can we check it?
             */
            if (c->state == STATE_UNCONNECTED)
                continue;

            rtnev = pollfd->rtnevents;

#ifdef USE_SSL
            if (c->state == STATE_CONNECTED && c->ssl && SSL_in_init(c->ssl)) {
                ssl_proceed_handshake(c);
                continue;
            }
#endif

            /*
             * Notes: APR_POLLHUP is set after FIN is received on some
             * systems, so treat that like APR_POLLIN so that we try to read
             * again.
             *
             * Some systems return APR_POLLERR with APR_POLLHUP.  We need to
             * call read_connection() for APR_POLLHUP, so check for
             * APR_POLLHUP first so that a closed connection isn't treated
             * like an I/O error.  If it is, we never figure out that the
             * connection is done and we loop here endlessly calling
             * apr_poll().
             */
            if ((rtnev & APR_POLLIN) || (rtnev & APR_POLLPRI) || (rtnev & APR_POLLHUP))
                read_connection(c);
            if ((rtnev & APR_POLLERR) || (rtnev & APR_POLLNVAL)) {
                if (destsa->next && c->state == STATE_CONNECTING && good == 0) {
                    destsa = destsa->next;
                    start_connect(c);
                }
                else {
                    bad++;
                    err_except++;
                    /* avoid apr_poll/EINPROGRESS loop on HP-UX, let recv discover ECONNREFUSED */
                    if (c->state == STATE_CONNECTING) {
                        read_connection(c);
                    }
                    else {
                        start_connect(c);
                    }
                }
                continue;
            }
            if (rtnev & APR_POLLOUT) {
                if (c->state == STATE_CONNECTING) {
                    rv = apr_socket_connect(c->aprsock, destsa);
                    if (rv != APR_SUCCESS) {
                        set_conn_state(c, STATE_UNCONNECTED);
                        apr_socket_close(c->aprsock);
                        err_conn++;
                        if (bad++ > 10) {
                            fprintf(stderr,
                                    "\nTest aborted after 10 failures\n\n");
                            apr_err("apr_socket_connect()", rv);
                        }
                        start_connect(c);
                        continue;
                    }
                    else {
                        set_conn_state(c, STATE_CONNECTED);
#ifdef USE_SSL
                        if (c->ssl)
                            ssl_proceed_handshake(c);
                        else
#endif
                        write_request(c);
                    }
                }
                else {
                    write_request(c);
                }
            }
        }
    } while (lasttime < stoptime && done < requests);

    if (heartbeatres)
        fprintf(stderr, "Finished %d requests\n", done);
    else
        printf("..done\n");

    if (use_html)
        output_html_results();
    else
        output_results(0);
}

/* ------------------------------------------------------- */

/* display copyright information */
static void copyright(void)
{
    if (!use_html) {
        printf("This is ApacheBench, Version %s\n", AP_AB_BASEREVISION " <$Revision$>");
        printf("Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/\n");
        printf("Licensed to The Apache Software Foundation, http://www.apache.org/\n");
        printf("\n");
    }
    else {
        printf("<p>\n");
        printf(" This is ApacheBench, Version %s <i>&lt;%s&gt;</i><br>\n", AP_AB_BASEREVISION, "$Revision$");
        printf(" Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/<br>\n");
        printf(" Licensed to The Apache Software Foundation, http://www.apache.org/<br>\n");
        printf("</p>\n<p>\n");
    }
}

/* display usage information */
static void usage(const char *progname)
{
    fprintf(stderr, "Usage: %s [options] [http"
#ifdef USE_SSL
        "[s]"
#endif
        "://]hostname[:port]/path\n", progname);
/* 80 column ruler:  ********************************************************************************
 */
    fprintf(stderr, "Options are:\n");
    fprintf(stderr, "    -n requests     Number of requests to perform\n");
    fprintf(stderr, "    -c concurrency  Number of multiple requests to make at a time\n");
    fprintf(stderr, "    -t timelimit    Seconds to max. to spend on benchmarking\n");
    fprintf(stderr, "                    This implies -n 50000\n");
    fprintf(stderr, "    -s timeout      Seconds to max. wait for each response\n");
    fprintf(stderr, "                    Default is 30 seconds\n");
    fprintf(stderr, "    -b windowsize   Size of TCP send/receive buffer, in bytes\n");
    fprintf(stderr, "    -B address      Address to bind to when making outgoing connections\n");
    fprintf(stderr, "    -p postfile     File containing data to POST. Remember also to set -T\n");
    fprintf(stderr, "    -u putfile      File containing data to PUT. Remember also to set -T\n");
    fprintf(stderr, "    -T content-type Content-type header to use for POST/PUT data, eg.\n");
    fprintf(stderr, "                    'application/x-www-form-urlencoded'\n");
    fprintf(stderr, "                    Default is 'text/plain'\n");
    fprintf(stderr, "    -v verbosity    How much troubleshooting info to print\n");
    fprintf(stderr, "    -w              Print out results in HTML tables\n");
    fprintf(stderr, "    -i              Use HEAD instead of GET\n");
    fprintf(stderr, "    -x attributes   String to insert as table attributes\n");
    fprintf(stderr, "    -y attributes   String to insert as tr attributes\n");
    fprintf(stderr, "    -z attributes   String to insert as td or th attributes\n");
    fprintf(stderr, "    -C attribute    Add cookie, eg. 'Apache=1234'. (repeatable)\n");
    fprintf(stderr, "    -H attribute    Add Arbitrary header line, eg. 'Accept-Encoding: gzip'\n");
    fprintf(stderr, "                    Inserted after all normal header lines. (repeatable)\n");
    fprintf(stderr, "    -A attribute    Add Basic WWW Authentication, the attributes\n");
    fprintf(stderr, "                    are a colon separated username and password.\n");
    fprintf(stderr, "    -P attribute    Add Basic Proxy Authentication, the attributes\n");
    fprintf(stderr, "                    are a colon separated username and password.\n");
    fprintf(stderr, "    -X proxy:port   Proxyserver and port number to use\n");
    fprintf(stderr, "    -V              Print version number and exit\n");
    fprintf(stderr, "    -k              Use HTTP KeepAlive feature\n");
    fprintf(stderr, "    -d              Do not show percentiles served table.\n");
    fprintf(stderr, "    -S              Do not show confidence estimators and warnings.\n");
    fprintf(stderr, "    -q              Do not show progress when doing more than 150 requests\n");
    fprintf(stderr, "    -l              Accept variable document length (use this for dynamic pages)\n");
    fprintf(stderr, "    -g filename     Output collected data to gnuplot format file.\n");
    fprintf(stderr, "    -e filename     Output CSV file with percentages served\n");
    fprintf(stderr, "    -r              Don't exit on socket receive errors.\n");
    fprintf(stderr, "    -m method       Method name\n");
    fprintf(stderr, "    -h              Display usage information (this message)\n");
#ifdef USE_SSL

#ifndef OPENSSL_NO_SSL2
#define SSL2_HELP_MSG "SSL2, "
#else
#define SSL2_HELP_MSG ""
#endif

#ifndef OPENSSL_NO_SSL3
#define SSL3_HELP_MSG "SSL3, "
#else
#define SSL3_HELP_MSG ""
#endif

#ifdef HAVE_TLSV1_X
#define TLS1_X_HELP_MSG ", TLS1.1, TLS1.2"
#else
#define TLS1_X_HELP_MSG ""
#endif

#ifdef HAVE_TLSEXT
    fprintf(stderr, "    -I              Disable TLS Server Name Indication (SNI) extension\n");
#endif
    fprintf(stderr, "    -Z ciphersuite  Specify SSL/TLS cipher suite (See openssl ciphers)\n");
    fprintf(stderr, "    -f protocol     Specify SSL/TLS protocol\n");
    fprintf(stderr, "                    (" SSL2_HELP_MSG SSL3_HELP_MSG "TLS1" TLS1_X_HELP_MSG " or ALL)\n");
#endif
    exit(EINVAL);
}

/* ------------------------------------------------------- */

/* split URL into parts */

static int parse_url(const char *url)
{
    char *cp;
    char *h;
    char *scope_id;
    apr_status_t rv;

    /* Save a copy for the proxy */
    fullurl = apr_pstrdup(cntxt, url);

    if (strlen(url) > 7 && strncmp(url, "http://", 7) == 0) {
        url += 7;
#ifdef USE_SSL
        is_ssl = 0;
#endif
    }
    else
#ifdef USE_SSL
    if (strlen(url) > 8 && strncmp(url, "https://", 8) == 0) {
        url += 8;
        is_ssl = 1;
    }
#else
    if (strlen(url) > 8 && strncmp(url, "https://", 8) == 0) {
        fprintf(stderr, "SSL not compiled in; no https support\n");
        exit(1);
    }
#endif

    if ((cp = strchr(url, '/')) == NULL)
        return 1;
    h = apr_pstrmemdup(cntxt, url, cp - url);
    rv = apr_parse_addr_port(&hostname, &scope_id, &port, h, cntxt);
    if (rv != APR_SUCCESS || !hostname || scope_id) {
        return 1;
    }
    path = apr_pstrdup(cntxt, cp);
    *cp = '\0';
    if (*url == '[') {      /* IPv6 numeric address string */
        host_field = apr_psprintf(cntxt, "[%s]", hostname);
    }
    else {
        host_field = hostname;
    }

    if (port == 0) {        /* no port specified */
#ifdef USE_SSL
        if (is_ssl)
            port = 443;
        else
#endif
        port = 80;
    }

    if ((
#ifdef USE_SSL
         is_ssl && (port != 443)) || (!is_ssl &&
#endif
         (port != 80)))
    {
        colonhost = apr_psprintf(cntxt,":%d",port);
    } else
        colonhost = "";
    return 0;
}

/* ------------------------------------------------------- */

/* read data to POST/PUT from file, save contents and length */

static apr_status_t open_postfile(const char *pfile)
{
    apr_file_t *postfd;
    apr_finfo_t finfo;
    apr_status_t rv;
    char errmsg[120];

    rv = apr_file_open(&postfd, pfile, APR_READ, APR_OS_DEFAULT, cntxt);
    if (rv != APR_SUCCESS) {
        fprintf(stderr, "ab: Could not open POST data file (%s): %s\n", pfile,
                apr_strerror(rv, errmsg, sizeof errmsg));
        return rv;
    }

    rv = apr_file_info_get(&finfo, APR_FINFO_NORM, postfd);
    if (rv != APR_SUCCESS) {
        fprintf(stderr, "ab: Could not stat POST data file (%s): %s\n", pfile,
                apr_strerror(rv, errmsg, sizeof errmsg));
        return rv;
    }
    postlen = (apr_size_t)finfo.size;
    postdata = xmalloc(postlen);
    rv = apr_file_read_full(postfd, postdata, postlen, NULL);
    if (rv != APR_SUCCESS) {
        fprintf(stderr, "ab: Could not read POST data file: %s\n",
                apr_strerror(rv, errmsg, sizeof errmsg));
        return rv;
    }
    apr_file_close(postfd);
    return APR_SUCCESS;
}

/* ------------------------------------------------------- */

/* sort out command-line args and call test */
int main(int argc, const char * const argv[])
{
    int l;
    char tmp[1024];
    apr_status_t status;
    apr_getopt_t *opt;
    const char *opt_arg;
    char c;
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
    int max_prot = TLS1_2_VERSION;
#ifndef OPENSSL_NO_SSL3
    int min_prot = SSL3_VERSION;
#else
    int min_prot = TLS1_VERSION;
#endif
#endif /* #if OPENSSL_VERSION_NUMBER >= 0x10100000L */
#ifdef USE_SSL
    AB_SSL_METHOD_CONST SSL_METHOD *meth = SSLv23_client_method();
#endif

    /* table defaults  */
    tablestring = "";
    trstring = "";
    tdstring = "bgcolor=white";
    cookie = "";
    auth = "";
    proxyhost = "";
    hdrs = "";

    apr_app_initialize(&argc, &argv, NULL);
    atexit(apr_terminate);
    apr_pool_create(&cntxt, NULL);
    apr_pool_abort_set(abort_on_oom, cntxt);

#ifdef NOT_ASCII
    status = apr_xlate_open(&to_ascii, "ISO-8859-1", APR_DEFAULT_CHARSET, cntxt);
    if (status) {
        fprintf(stderr, "apr_xlate_open(to ASCII)->%d\n", status);
        exit(1);
    }
    status = apr_xlate_open(&from_ascii, APR_DEFAULT_CHARSET, "ISO-8859-1", cntxt);
    if (status) {
        fprintf(stderr, "apr_xlate_open(from ASCII)->%d\n", status);
        exit(1);
    }
    status = apr_base64init_ebcdic(to_ascii, from_ascii);
    if (status) {
        fprintf(stderr, "apr_base64init_ebcdic()->%d\n", status);
        exit(1);
    }
#endif

    myhost = NULL; /* 0.0.0.0 or :: */

    apr_getopt_init(&opt, cntxt, argc, argv);
    while ((status = apr_getopt(opt, "n:c:t:s:b:T:p:u:v:lrkVhwiIx:y:z:C:H:P:A:g:X:de:SqB:m:"
#ifdef USE_SSL
            "Z:f:"
#endif
            ,&c, &opt_arg)) == APR_SUCCESS) {
        switch (c) {
            case 'n':
                requests = atoi(opt_arg);
                if (requests <= 0) {
                    err("Invalid number of requests\n");
                }
                break;
            case 'k':
                keepalive = 1;
                break;
            case 'q':
                heartbeatres = 0;
                break;
            case 'c':
                concurrency = atoi(opt_arg);
                break;
            case 'b':
                windowsize = atoi(opt_arg);
                break;
            case 'i':
                if (method != NO_METH)
                    err("Cannot mix HEAD with other methods\n");
                method = HEAD;
                break;
            case 'g':
                gnuplot = xstrdup(opt_arg);
                break;
            case 'd':
                percentile = 0;
                break;
            case 'e':
                csvperc = xstrdup(opt_arg);
                break;
            case 'S':
                confidence = 0;
                break;
            case 's':
                aprtimeout = apr_time_from_sec(atoi(opt_arg)); /* timeout value */
                break;
            case 'p':
                if (method != NO_METH)
                    err("Cannot mix POST with other methods\n");
                if (open_postfile(opt_arg) != APR_SUCCESS) {
                    exit(1);
                }
                method = POST;
                send_body = 1;
                break;
            case 'u':
                if (method != NO_METH)
                    err("Cannot mix PUT with other methods\n");
                if (open_postfile(opt_arg) != APR_SUCCESS) {
                    exit(1);
                }
                method = PUT;
                send_body = 1;
                break;
            case 'l':
                nolength = 1;
                break;
            case 'r':
                recverrok = 1;
                break;
            case 'v':
                verbosity = atoi(opt_arg);
                break;
            case 't':
                tlimit = atoi(opt_arg);
                requests = MAX_REQUESTS;    /* need to size data array on
                                             * something */
                break;
            case 'T':
                content_type = apr_pstrdup(cntxt, opt_arg);
                break;
            case 'C':
                cookie = apr_pstrcat(cntxt, "Cookie: ", opt_arg, "\r\n", NULL);
                break;
            case 'A':
                /*
                 * assume username passwd already to be in colon separated form.
                 * Ready to be uu-encoded.
                 */
                while (apr_isspace(*opt_arg))
                    opt_arg++;
                if (apr_base64_encode_len(strlen(opt_arg)) > sizeof(tmp)) {
                    err("Authentication credentials too long\n");
                }
                l = apr_base64_encode(tmp, opt_arg, strlen(opt_arg));
                tmp[l] = '\0';

                auth = apr_pstrcat(cntxt, auth, "Authorization: Basic ", tmp,
                                       "\r\n", NULL);
                break;
            case 'P':
                /*
                 * assume username passwd already to be in colon separated form.
                 */
                while (apr_isspace(*opt_arg))
                opt_arg++;
                if (apr_base64_encode_len(strlen(opt_arg)) > sizeof(tmp)) {
                    err("Proxy credentials too long\n");
                }
                l = apr_base64_encode(tmp, opt_arg, strlen(opt_arg));
                tmp[l] = '\0';

                auth = apr_pstrcat(cntxt, auth, "Proxy-Authorization: Basic ",
                                       tmp, "\r\n", NULL);
                break;
            case 'H':
                hdrs = apr_pstrcat(cntxt, hdrs, opt_arg, "\r\n", NULL);
                /*
                 * allow override of some of the common headers that ab adds
                 */
                if (strncasecmp(opt_arg, "Host:", 5) == 0) {
                    char *host;
                    apr_size_t len;
                    opt_arg += 5;
                    while (apr_isspace(*opt_arg))
                        opt_arg++;
                    len = strlen(opt_arg);
                    host = strdup(opt_arg);
                    while (len && apr_isspace(host[len-1]))
                        host[--len] = '\0';
                    opt_host = host;
                } else if (strncasecmp(opt_arg, "Accept:", 7) == 0) {
                    opt_accept = 1;
                } else if (strncasecmp(opt_arg, "User-Agent:", 11) == 0) {
                    opt_useragent = 1;
                }
                break;
            case 'w':
                use_html = 1;
                break;
                /*
                 * if any of the following three are used, turn on html output
                 * automatically
                 */
            case 'x':
                use_html = 1;
                tablestring = opt_arg;
                break;
            case 'X':
                {
                    char *p;
                    /*
                     * assume proxy-name[:port]
                     */
                    if ((p = strchr(opt_arg, ':'))) {
                        *p = '\0';
                        p++;
                        proxyport = atoi(p);
                    }
                    proxyhost = apr_pstrdup(cntxt, opt_arg);
                    isproxy = 1;
                }
                break;
            case 'y':
                use_html = 1;
                trstring = opt_arg;
                break;
            case 'z':
                use_html = 1;
                tdstring = opt_arg;
                break;
            case 'h':
                usage(argv[0]);
                break;
            case 'V':
                copyright();
                return 0;
            case 'B':
                myhost = apr_pstrdup(cntxt, opt_arg);
                break;
            case 'm':
                method = CUSTOM_METHOD;
                method_str[CUSTOM_METHOD] = strdup(opt_arg);
                break;
#ifdef USE_SSL
            case 'Z':
                ssl_cipher = strdup(opt_arg);
                break;
            case 'f':
#if OPENSSL_VERSION_NUMBER < 0x10100000L
                if (strncasecmp(opt_arg, "ALL", 3) == 0) {
                    meth = SSLv23_client_method();
#ifndef OPENSSL_NO_SSL2
                } else if (strncasecmp(opt_arg, "SSL2", 4) == 0) {
                    meth = SSLv2_client_method();
#ifdef HAVE_TLSEXT
                    tls_use_sni = 0;
#endif
#endif
#ifndef OPENSSL_NO_SSL3
                } else if (strncasecmp(opt_arg, "SSL3", 4) == 0) {
                    meth = SSLv3_client_method();
#ifdef HAVE_TLSEXT
                    tls_use_sni = 0;
#endif
#endif
#ifdef HAVE_TLSV1_X
                } else if (strncasecmp(opt_arg, "TLS1.1", 6) == 0) {
                    meth = TLSv1_1_client_method();
                } else if (strncasecmp(opt_arg, "TLS1.2", 6) == 0) {
                    meth = TLSv1_2_client_method();
#endif
                } else if (strncasecmp(opt_arg, "TLS1", 4) == 0) {
                    meth = TLSv1_client_method();
                }
#else /* #if OPENSSL_VERSION_NUMBER < 0x10100000L */
                meth = TLS_client_method();
                if (strncasecmp(opt_arg, "ALL", 3) == 0) {
                    max_prot = TLS1_2_VERSION;
#ifndef OPENSSL_NO_SSL3
                    min_prot = SSL3_VERSION;
#else
                    min_prot = TLS1_VERSION;
#endif
#ifndef OPENSSL_NO_SSL3
                } else if (strncasecmp(opt_arg, "SSL3", 4) == 0) {
                    max_prot = SSL3_VERSION;
                    min_prot = SSL3_VERSION;
#endif
                } else if (strncasecmp(opt_arg, "TLS1.1", 6) == 0) {
                    max_prot = TLS1_1_VERSION;
                    min_prot = TLS1_1_VERSION;
                } else if (strncasecmp(opt_arg, "TLS1.2", 6) == 0) {
                    max_prot = TLS1_2_VERSION;
                    min_prot = TLS1_2_VERSION;
                } else if (strncasecmp(opt_arg, "TLS1", 4) == 0) {
                    max_prot = TLS1_VERSION;
                    min_prot = TLS1_VERSION;
                }
#endif /* #if OPENSSL_VERSION_NUMBER < 0x10100000L */
                break;
#ifdef HAVE_TLSEXT
            case 'I':
                tls_use_sni = 0;
                break;
#endif
#endif
        }
    }

    if (opt->ind != argc - 1) {
        fprintf(stderr, "%s: wrong number of arguments\n", argv[0]);
        usage(argv[0]);
    }

    if (method == NO_METH) {
        method = GET;
    }

    if (parse_url(apr_pstrdup(cntxt, opt->argv[opt->ind++]))) {
        fprintf(stderr, "%s: invalid URL\n", argv[0]);
        usage(argv[0]);
    }

    if ((concurrency < 0) || (concurrency > MAX_CONCURRENCY)) {
        fprintf(stderr, "%s: Invalid Concurrency [Range 0..%d]\n",
                argv[0], MAX_CONCURRENCY);
        usage(argv[0]);
    }

    if (concurrency > requests) {
        fprintf(stderr, "%s: Cannot use concurrency level greater than "
                "total number of requests\n", argv[0]);
        usage(argv[0]);
    }

    if ((heartbeatres) && (requests > 150)) {
        heartbeatres = requests / 10;   /* Print line every 10% of requests */
        if (heartbeatres < 100)
            heartbeatres = 100; /* but never more often than once every 100
                                 * connections. */
    }
    else
        heartbeatres = 0;

#ifdef USE_SSL
#ifdef RSAREF
    R_malloc_init();
#else
#if OPENSSL_VERSION_NUMBER < 0x10100000L
    CRYPTO_malloc_init();
#endif
#endif
    SSL_load_error_strings();
    SSL_library_init();
    bio_out=BIO_new_fp(stdout,BIO_NOCLOSE);
    bio_err=BIO_new_fp(stderr,BIO_NOCLOSE);

    if (!(ssl_ctx = SSL_CTX_new(meth))) {
        BIO_printf(bio_err, "Could not initialize SSL Context.\n");
        ERR_print_errors(bio_err);
        exit(1);
    }
    SSL_CTX_set_options(ssl_ctx, SSL_OP_ALL);
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
    SSL_CTX_set_max_proto_version(ssl_ctx, max_prot);
    SSL_CTX_set_min_proto_version(ssl_ctx, min_prot);
#endif
#ifdef SSL_MODE_RELEASE_BUFFERS
    /* Keep memory usage as low as possible */
    SSL_CTX_set_mode (ssl_ctx, SSL_MODE_RELEASE_BUFFERS);
#endif
    if (ssl_cipher != NULL) {
        if (!SSL_CTX_set_cipher_list(ssl_ctx, ssl_cipher)) {
            fprintf(stderr, "error setting cipher list [%s]\n", ssl_cipher);
        ERR_print_errors_fp(stderr);
        exit(1);
    }
    }
    if (verbosity >= 3) {
        SSL_CTX_set_info_callback(ssl_ctx, ssl_state_cb);
    }
#endif
#ifdef SIGPIPE
    apr_signal(SIGPIPE, SIG_IGN);       /* Ignore writes to connections that
                                         * have been closed at the other end. */
#endif
    copyright();
    test();
    apr_pool_destroy(cntxt);

    return 0;
}