Lighttpd

#include <ctype.h>

#include <stdlib.h>

#include <string.h>

#include "base.h"

#include "log.h"

#include "buffer.h"

#include "plugin.h"

#include <unistd.h>

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

/**

 * small lighttpd-plugin for selective speed

 *

 * Bjoern Kalkbrenner <terminar@cyberphoria.org> [20070204]

 *

 * Adds: X-LIGHTTPD-KBytes-per-second header, you now can use e.g.

 * <?php

 * header("X-LIGHTTPD-KBytes-per-second: 20");

 * header("X-Sendfile: /path/to/file");

 * ?>

 * to set the max speed for the download/current connection. This can be also used with reproxy.

 * Options:

 * # use this on the frontend to just copy the header from the response to the request header (forward it to the backend)

 * speed.just-copy-header = "enable"

 * # use this on the backend to fetch the speed from the request. This is not useful on the frontend, i think :)

 * speed.use-request = "enable"

 * 

 */

/* plugin config for all request/connections */

typedef struct {

	unsigned short just_copy_header;

	unsigned short use_request;

} plugin_config;

typedef struct {

	PLUGIN_DATA;

	buffer *tmp_buf;

	plugin_config **config_storage;

	plugin_config conf;

} plugin_data;

/* init the plugin data */

INIT_FUNC(mod_speed_init) {

	plugin_data *p;

	UNUSED(srv);

	p = calloc(1, sizeof(*p));

	return p;

}

/* detroy the plugin data */

FREE_FUNC(mod_speed_free) {

	plugin_data *p = p_d;

	UNUSED(srv);

	if (!p) return HANDLER_GO_ON;

	if (p->config_storage) {

		size_t i;

		for (i = 0; i < srv->config_context->used; i++) {

			plugin_config *s = p->config_storage[i];

			if (!s) continue;

			free(s);

		}

		free(p->config_storage);

	}

	free(p);

	return HANDLER_GO_ON;

}

/* handle plugin config and check values */

SETDEFAULTS_FUNC(mod_speed_set_defaults) {

	plugin_data *p = p_d;

	size_t i = 0;

	config_values_t cv[] = {

		{ "speed.just-copy-header", NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION },       /* 0 */

		{ "speed.use-request", NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION },       /* 1 */

		{ NULL,                         NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }

	};

	if (!p) return HANDLER_ERROR;

	p->config_storage = calloc(1, srv->config_context->used * sizeof(specific_config *));

	for (i = 0; i < srv->config_context->used; i++) {

		plugin_config *s;

		s = calloc(1, sizeof(plugin_config));

		s->just_copy_header = 0;

		s->use_request = 0;

		cv[0].destination = &(s->just_copy_header);

		cv[1].destination = &(s->use_request);

		p->config_storage[i] = s;

		if (0 != config_insert_values_global(srv, ((data_config *)srv->config_context->data[i])->value, cv)) {

		    TRACE("%s","error inserting values config");

			return HANDLER_ERROR;

		}

	}

	return HANDLER_GO_ON;

}

static int mod_speed_patch_connection(server *srv, connection *con, plugin_data *p) {

	size_t i, j;

	plugin_config *s = p->config_storage[0];

	PATCH_OPTION(just_copy_header);

	PATCH_OPTION(use_request);

	/* skip the first, the global context */

	for (i = 1; i < srv->config_context->used; i++) {

		data_config *dc = (data_config *)srv->config_context->data[i];

		s = p->config_storage[i];

		/* condition didn't match */

		if (!config_check_cond(srv, con, dc)) continue;

		/* merge config */

		for (j = 0; j < dc->value->used; j++) {

			data_unset *du = dc->value->data[j];

			if (buffer_is_equal_string(du->key, CONST_STR_LEN("speed.just-copy-header"))) {

			TRACE("%s","copy header set");

				PATCH_OPTION(just_copy_header);

			}

			if (buffer_is_equal_string(du->key, CONST_STR_LEN("speed.use-request"))) {

			TRACE("%s","use request header set");

				PATCH_OPTION(use_request);

			}

		}

	}

	return 0;

}

URIHANDLER_FUNC(mod_speed_send_request_content) {

	plugin_data *p = p_d;

	buffer *b=NULL;

	data_string *ds = NULL;

	data_string *ds_request = NULL;

	int found=0;

	mod_speed_patch_connection(srv, con, p);

    	if (NULL != (ds = (data_string *)array_get_element(con->response.headers, CONST_STR_LEN("X-LIGHTTPD-KBytes-per-second")))) {

	    if (p->conf.just_copy_header > 0) {

    		if (NULL == (ds_request = (data_string *)array_get_element(con->request.headers, CONST_STR_LEN("X-LIGHTTPD-KBytes-per-second")))) {

    		    if (NULL == (ds_request = (data_string *)array_get_unused_element(con->request.headers, TYPE_STRING))) {

    			ds_request = data_string_init();

		    }

		} else {

		    found=1;

		} 

		buffer_copy_string(ds_request->key, "X-LIGHTTPD-KBytes-per-second");

		buffer_copy_string(ds_request->value, ds->value->ptr);

		if (!found)

		{

		    array_insert_unique(con->request.headers, (data_unset *)ds_request);

		}

	    } else

	    {

		con->conf.kbytes_per_second = atol(ds->value->ptr);

		TRACE("===> Found my header for speed in send_request_content: %s",ds->value->ptr);

	    }

	}

	/* not found */

	return HANDLER_GO_ON;

}

URIHANDLER_FUNC(mod_speed_start_backend) {

	plugin_data *p = p_d;

	buffer *b=NULL;

	data_string *ds = NULL;

	data_string *ds_request = NULL;

	mod_speed_patch_connection(srv, con, p);

	if (p->conf.use_request > 0)

	{

		if (NULL != (ds = (data_string *)array_get_element(con->request.headers, CONST_STR_LEN("X-LIGHTTPD-KBytes-per-second")))) {

		    con->conf.kbytes_per_second = atol(ds->value->ptr);

		}

	}

	/* not found */

	return HANDLER_GO_ON;

}

/* this function is called at dlopen() time and inits the callbacks */

int mod_speed_plugin_init(plugin *p) {

	p->version     = LIGHTTPD_VERSION_ID;

	p->name        = buffer_init_string("speed");

	p->init        = mod_speed_init;

	p->set_defaults  = mod_speed_set_defaults;

	p->cleanup     = mod_speed_free;

	p->handle_start_backend = mod_speed_start_backend;

	p->handle_send_request_content = mod_speed_send_request_content;

	p->data        = NULL;

	return 0;

}