78d603a2e953af2443efca54451cdd77c7a55707Jakub Hrozek

78d603a2e953af2443efca54451cdd77c7a55707Jakub Hrozek#include "ap_config.h"

78d603a2e953af2443efca54451cdd77c7a55707Jakub Hrozek#include "ap_mmn.h"

5ef295d1cf410ceaa92c03a7843df8a36409f465Stephen Gallagher#include "httpd.h"

5ef295d1cf410ceaa92c03a7843df8a36409f465Stephen Gallagher#include "http_config.h"

5ef295d1cf410ceaa92c03a7843df8a36409f465Stephen Gallagher#include "http_connection.h"

5ef295d1cf410ceaa92c03a7843df8a36409f465Stephen Gallagher#include "http_core.h"

5ef295d1cf410ceaa92c03a7843df8a36409f465Stephen Gallagher#include "http_log.h"

5ef295d1cf410ceaa92c03a7843df8a36409f465Stephen Gallagher

5ef295d1cf410ceaa92c03a7843df8a36409f465Stephen Gallagher#include "apr_buckets.h"

5ef295d1cf410ceaa92c03a7843df8a36409f465Stephen Gallagher#include "apr_strings.h"

5ef295d1cf410ceaa92c03a7843df8a36409f465Stephen Gallagher#include "util_filter.h"

5ef295d1cf410ceaa92c03a7843df8a36409f465Stephen Gallagher#include "scoreboard.h"

5ef295d1cf410ceaa92c03a7843df8a36409f465Stephen Gallagher

c3869cac3143e3084e95521d76fe7345b3c8d00fJakub Hrozekmodule AP_MODULE_DECLARE_DATA echo_module;

c3869cac3143e3084e95521d76fe7345b3c8d00fJakub Hrozek

c3869cac3143e3084e95521d76fe7345b3c8d00fJakub Hrozektypedef struct {

c3869cac3143e3084e95521d76fe7345b3c8d00fJakub Hrozek int bEnabled;

c3869cac3143e3084e95521d76fe7345b3c8d00fJakub Hrozek} EchoConfig;

c3869cac3143e3084e95521d76fe7345b3c8d00fJakub Hrozek

c3869cac3143e3084e95521d76fe7345b3c8d00fJakub Hrozekstatic void *create_echo_server_config(apr_pool_t *p, server_rec *s)

{

EchoConfig *pConfig = apr_pcalloc(p, sizeof *pConfig);

pConfig->bEnabled = 0;

return pConfig;

}

static const char *echo_on(cmd_parms *cmd, void *dummy, int arg)

{

EchoConfig *pConfig = ap_get_module_config(cmd->server->module_config,

&echo_module);

pConfig->bEnabled = arg;

return NULL;

}

static apr_status_t brigade_peek(apr_bucket_brigade *bbIn,

char *buff, apr_size_t bufflen)

{

apr_bucket *b;

apr_size_t readbytes = 0;

if (bufflen--)

/* compensate for NULL */

*buff = '\0';

else

return APR_EGENERAL;

if (APR_BRIGADE_EMPTY(bbIn))

return APR_EGENERAL;

b = APR_BRIGADE_FIRST(bbIn);

while ((b != APR_BRIGADE_SENTINEL(bbIn)) && (readbytes < bufflen)) {

const char *pos;

const char *str;

apr_size_t len;

apr_status_t rv;

if ((rv = apr_bucket_read(b, &str, &len, APR_NONBLOCK_READ))

!= APR_SUCCESS)

return rv;

if ((pos = memchr(str, APR_ASCII_LF, len)) != NULL)

len = pos - str;

if (len > bufflen - readbytes)

len = bufflen - readbytes;

memcpy (buff + readbytes, str, len);

readbytes += len;

buff[readbytes] = '\0';

b = APR_BUCKET_NEXT(b);

}

return APR_SUCCESS;

}

static int update_echo_child_status(ap_sb_handle_t *sbh,

int status, conn_rec *c,

apr_bucket_brigade *last_echoed)

{

worker_score *ws = ap_get_scoreboard_worker(sbh);

int old_status = ws->status;

ws->status = status;

if (!ap_extended_status)

return old_status;

ws->last_used = apr_time_now();

/* initial pass only, please - in the name of efficiency */

if (c) {

apr_cpystrn(ws->client,

ap_get_remote_host(c, c->base_server->lookup_defaults,

REMOTE_NOLOOKUP, NULL),

sizeof(ws->client));

apr_cpystrn(ws->vhost, c->base_server->server_hostname,

sizeof(ws->vhost));

/* Deliberate trailing space - filling in string on WRITE passes */

apr_cpystrn(ws->request, "ECHO ", sizeof(ws->request));

}

/* each subsequent WRITE pass, let's update what we echoed */

if (last_echoed) {

brigade_peek(last_echoed, ws->request + sizeof("ECHO ") - 1,

sizeof(ws->request) - sizeof("ECHO ") + 1);

}

return old_status;

}

static int process_echo_connection(conn_rec *c)

{

apr_bucket_brigade *bb;

apr_bucket *b;

apr_socket_t *csd = NULL;

EchoConfig *pConfig = ap_get_module_config(c->base_server->module_config,

&echo_module);

if (!pConfig->bEnabled) {

return DECLINED;

}

ap_time_process_request(c->sbh, START_PREQUEST);

update_echo_child_status(c->sbh, SERVER_BUSY_READ, c, NULL);

bb = apr_brigade_create(c->pool, c->bucket_alloc);

for ( ; ; ) {

apr_status_t rv;

/* Get a single line of input from the client */

if (((rv = ap_get_brigade(c->input_filters, bb, AP_MODE_GETLINE,

APR_BLOCK_READ, 0)) != APR_SUCCESS)) {

apr_brigade_cleanup(bb);

if (!APR_STATUS_IS_EOF(rv) && ! APR_STATUS_IS_TIMEUP(rv))

ap_log_error(APLOG_MARK, APLOG_INFO, rv, c->base_server, APLOGNO(01611)

"ProtocolEcho: Failure reading from %s",

c->peer_ip);

break;

}

/* Something horribly wrong happened. Someone didn't block! */

if (APR_BRIGADE_EMPTY(bb)) {

apr_brigade_cleanup(bb);

ap_log_error(APLOG_MARK, APLOG_INFO, rv, c->base_server, APLOGNO(01612)

"ProtocolEcho: Error - read empty brigade from %s!",

c->peer_ip);

break;

}

if (!csd) {

csd = ap_get_conn_socket(c);

apr_socket_timeout_set(csd, c->base_server->keep_alive_timeout);

}

update_echo_child_status(c->sbh, SERVER_BUSY_WRITE, NULL, bb);

/* Make sure the data is flushed to the client */

b = apr_bucket_flush_create(c->bucket_alloc);

APR_BRIGADE_INSERT_TAIL(bb, b);

rv = ap_pass_brigade(c->output_filters, bb);

if (rv != APR_SUCCESS) {

ap_log_error(APLOG_MARK, APLOG_INFO, rv, c->base_server, APLOGNO(01613)

"ProtocolEcho: Failure writing to %s",

c->peer_ip);

break;

}

apr_brigade_cleanup(bb);

/* Announce our intent to loop */

update_echo_child_status(c->sbh, SERVER_BUSY_KEEPALIVE, NULL, NULL);

}

apr_brigade_destroy(bb);

ap_time_process_request(c->sbh, STOP_PREQUEST);

update_echo_child_status(c->sbh, SERVER_CLOSING, c, NULL);

return OK;

}

static const command_rec echo_cmds[] =

{

AP_INIT_FLAG("ProtocolEcho", echo_on, NULL, RSRC_CONF,

"Run an echo server on this host"),

{ NULL }

};

static void register_hooks(apr_pool_t *p)

{

ap_hook_process_connection(process_echo_connection, NULL, NULL,

APR_HOOK_MIDDLE);

}

AP_DECLARE_MODULE(echo) = {

STANDARD20_MODULE_STUFF,

NULL, /* create per-directory config structure */

NULL, /* merge per-directory config structures */

create_echo_server_config, /* create per-server config structure */

NULL, /* merge per-server config structures */

echo_cmds, /* command apr_table_t */

register_hooks /* register hooks */

};