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;

}