proto_detail.c

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/*
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/**
 * $Id: de798581e51c0bc7c01561da3b99f08ca7944e5f $
 * @file proto_detail.c
 * @brief Detail master protocol handler.
 *
 * @copyright 2017 Arran Cudbard-Bell (a.cudbardb@freeradius.org)
 * @copyright 2016 Alan DeKok (aland@freeradius.org)
 */
#include <freeradius-devel/io/application.h>
#include <freeradius-devel/io/listen.h>
#include <freeradius-devel/io/schedule.h>
#include <freeradius-devel/radius/radius.h>
#include <freeradius-devel/util/pair_legacy.h>
 
#include <freeradius-devel/server/dl_module.h>
#include <freeradius-devel/server/module.h>
#include <freeradius-devel/server/module_rlm.h>
 
#include "proto_detail.h"
 
extern fr_app_t proto_detail;
 
static int type_parse(TALLOC_CTX *ctx, void *out, UNUSED void *parent, CONF_ITEM *ci, conf_parser_t const *rule);
static int transport_parse(TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, conf_parser_t const *rule);
 
#if 0
/*
 *      When we want detailed debugging here, without detailed server
 *      debugging.
 */
#define MPRINT DEBUG
#else
#define MPRINT(x, ...)
#endif
 
/** How to parse a Detail listen section
 *
 */
static conf_parser_t const proto_detail_config[] = {
        { FR_CONF_OFFSET_TYPE_FLAGS("type", FR_TYPE_VOID, CONF_FLAG_NOT_EMPTY | CONF_FLAG_REQUIRED, proto_detail_t,
                          type), .func = type_parse },
        { FR_CONF_OFFSET_TYPE_FLAGS("transport", FR_TYPE_VOID, 0, proto_detail_t, io_submodule),
          .func = transport_parse, .dflt = "file" },
 
        /*
         *      Add this as a synonym so normal humans can understand it.
         */
        { FR_CONF_OFFSET("max_entry_size", proto_detail_t, max_packet_size) } ,
 
        /*
         *      For performance tweaking.  NOT for normal humans.
         */
        { FR_CONF_OFFSET("max_packet_size", proto_detail_t, max_packet_size) } ,
        { FR_CONF_OFFSET("num_messages", proto_detail_t, num_messages) } ,
 
        { FR_CONF_OFFSET("exit_when_done", proto_detail_t, exit_when_done) },
 
        { FR_CONF_OFFSET("priority", proto_detail_t, priority) },
 
        CONF_PARSER_TERMINATOR
};
 
static fr_dict_t const *dict_freeradius;
 
extern fr_dict_autoload_t proto_detail_dict[];
fr_dict_autoload_t proto_detail_dict[] = {
        { .out = &dict_freeradius, .proto = "freeradius" },
 
        DICT_AUTOLOAD_TERMINATOR
};
 
static fr_dict_attr_t const *attr_packet_dst_ip_address;
static fr_dict_attr_t const *attr_packet_dst_port;
static fr_dict_attr_t const *attr_packet_original_timestamp;
static fr_dict_attr_t const *attr_packet_src_ip_address;
static fr_dict_attr_t const *attr_packet_src_port;
 
extern fr_dict_attr_autoload_t proto_detail_dict_attr[];
fr_dict_attr_autoload_t proto_detail_dict_attr[] = {
        { .out = &attr_packet_dst_ip_address, .name = "Net.Dst.IP", .type = FR_TYPE_COMBO_IP_ADDR, .dict = &dict_freeradius },
        { .out = &attr_packet_dst_port, .name = "Net.Dst.Port", .type = FR_TYPE_UINT16, .dict = &dict_freeradius },
        { .out = &attr_packet_original_timestamp, .name = "Packet-Original-Timestamp", .type = FR_TYPE_DATE, .dict = &dict_freeradius },
        { .out = &attr_packet_src_ip_address, .name = "Net.Src.IP", .type = FR_TYPE_COMBO_IP_ADDR, .dict = &dict_freeradius },
        { .out = &attr_packet_src_port, .name = "Net.Src.Port", .type = FR_TYPE_UINT16, .dict = &dict_freeradius },
 
        DICT_AUTOLOAD_TERMINATOR
};
 
/** Translates the packet-type into a submodule name
 *
 * @param[in] ctx       to allocate data in (instance of proto_detail).
 * @param[out] out      Where to write a module_instance_t containing the module handle and instance.
 * @param[in] parent    Base structure address.
 * @param[in] ci        #CONF_PAIR specifying the name of the type module.
 * @param[in] rule      unused.
 * @return
 *      - 0 on success.
 *      - -1 on failure.
 */
static int type_parse(UNUSED TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, UNUSED conf_parser_t const *rule)
{
        proto_detail_t          *inst = talloc_get_type_abort(parent, proto_detail_t);
        fr_dict_enum_value_t const      *type_enum;
        CONF_PAIR               *cp = cf_item_to_pair(ci);
        char const              *value = cf_pair_value(cp);
 
        *((char const **) out) = value;
 
        inst->dict = virtual_server_dict_by_child_ci(ci);
        if (!inst->dict) {
                cf_log_err(ci, "Please define 'namespace' in this virtual server");
                return -1;
        }
 
        inst->attr_packet_type = fr_dict_attr_by_name(NULL, fr_dict_root(inst->dict), "Packet-Type");
        if (!inst->attr_packet_type) {
                cf_log_err(ci, "Failed to find 'Packet-Type' attribute");
                return -1;
        }
 
        if (!value) {
                cf_log_err(ci, "No value given for 'type'");
                return -1;
        }
 
        type_enum = fr_dict_enum_by_name(inst->attr_packet_type, value, -1);
        if (!type_enum) {
                cf_log_err(ci, "Invalid type \"%s\"", value);
                return -1;
        }
 
        inst->code = type_enum->value->vb_uint32;
        return 0;
}
 
static int transport_parse(TALLOC_CTX *ctx, void *out, void *parent, CONF_ITEM *ci, conf_parser_t const *rule)
{
        proto_detail_t *inst = talloc_get_type_abort(parent, proto_detail_t);
 
        if (unlikely(virtual_server_listen_transport_parse(ctx, out, parent, ci, rule) < 0)) {
                return -1;
        }
 
        /*
         *      If we're not loading the work submodule directly, then try to load it here.
         */
        if (strcmp(inst->io_submodule->module->dl->name, "proto_detail_work") != 0) {
                CONF_SECTION            *transport_cs;
                module_instance_t       *mi;
                char const              *inst_name;
 
                inst->work_submodule = NULL;
 
                mi = virtual_server_listener_by_data(parent);
                fr_assert(mi);
 
                transport_cs = cf_section_find(mi->conf, "work", NULL);
                if (!transport_cs) {
                        transport_cs = cf_section_dup(mi->conf, mi->conf, inst->app_io_conf,
                                                      "work", NULL, false);
                        if (!transport_cs) {
                                cf_log_err(mi->conf, "Failed to create configuration for worker");
                                return -1;
                        }
                }
 
                if (module_instance_name_from_conf(&inst_name, transport_cs) < 0) return -1;
 
                /*
                 *      This *should* get bootstrapped at some point after this module
                 *      as it's inserted into the three the caller is iterating over.
                 *
                 *      We might want to revisit this, and use a linked list of modules
                 *      to iterate over instead of a tree, so we can add this to the end
                 *      of that list.
                 */
                inst->work_submodule = module_instance_alloc(mi->ml, mi, DL_MODULE_TYPE_SUBMODULE,
                                                             "work", inst_name, 0);
                if (inst->work_submodule == NULL) {
                error:
                        cf_log_perr(mi->conf, "Failed to load proto_detail_work");
                        TALLOC_FREE(inst->work_submodule);
                        return -1;
                }
 
                if (module_instance_conf_parse(inst->work_submodule, transport_cs) < 0) goto error;
 
                inst->work_io = (fr_app_io_t const *) inst->work_submodule->exported;
                inst->work_io_instance = inst->work_submodule->data;
                inst->work_io_conf = inst->work_submodule->conf;
        }
 
        return 0;
}
 
/** Decode the packet, and set the request->process function
 *
 */
static int mod_decode(void const *instance, request_t *request, uint8_t *const data, size_t data_len)
{
        proto_detail_t const    *inst = talloc_get_type_abort_const(instance, proto_detail_t);
        int                     num, lineno;
        uint8_t const           *p, *end;
        fr_pair_t               *vp;
        fr_pair_list_t          tmp_list;
        fr_dcursor_t            cursor;
        time_t                  timestamp = 0;
        fr_pair_parse_t root, relative;
 
        RHEXDUMP3(data, data_len, "proto_detail decode packet");
 
        request->packet->code = inst->code;
 
        /*
         *      Set default addresses
         */
        request->packet->socket.fd = -1;
        request->packet->socket.inet.src_ipaddr.af = AF_INET;
        request->packet->socket.inet.src_ipaddr.addr.v4.s_addr = htonl(INADDR_NONE);
        request->packet->socket.inet.dst_ipaddr = request->packet->socket.inet.src_ipaddr;
 
        request->reply->socket.inet.src_ipaddr = request->packet->socket.inet.src_ipaddr;
        request->reply->socket.inet.dst_ipaddr = request->packet->socket.inet.src_ipaddr;
 
        end = data + data_len;
 
        MPRINT("HEADER %s", data);
 
        if (sscanf((char const *) data, "%*s %*s %*d %*d:%*d:%*d %d", &num) != 1) {
                REDEBUG("Malformed header '%s'", (char const *) data);
                return -1;
        }
 
        /*
         *      Skip the header
         */
        for (p = data; p < end; p++) {
                if (!*p) break;
        }
 
        lineno = 1;
        fr_pair_dcursor_init(&cursor, &request->request_pairs);
        fr_dcursor_tail(&cursor);       /* Ensure we only free what we add on error */
        fr_pair_list_init(&tmp_list);
 
        /*
         *      Parse each individual line.
         */
        while (p < end) {
                /*
                 *      Each record begins with a zero byte.  If the
                 *      next byte is also zero, that's the end of
                 *      record indication.
                 */
                if ((end - p) < 2) break;
                if (!p[1]) break;
 
                /*
                 *      Already checked in the "read" routine.  But it
                 *      doesn't hurt to re-check it here.
                 */
                if ((*p != '\0') && (*p != '\t')) {
                        REDEBUG("Malformed line %d", lineno);
                        fr_dcursor_free_list(&cursor);
                        return -1;
                }
 
                p += 2;
 
                MPRINT("LINE   :%s", p);
 
                /*
                 *      Skip this for backwards compatibility.
                 */
                if (strncasecmp((char const *) p, "Request-Authenticator", 21) == 0) goto next;
 
                /*
                 *      The original time at which we received the
                 *      packet.  We need this to properly calculate
                 *      Acct-Delay-Time.
                 */
                if (strncasecmp((char const *) p, "Timestamp = ", 12) == 0) {
                        p += 12;
 
                        timestamp = atoi((char const *) p);
 
                        vp = fr_pair_afrom_da(request->request_ctx, attr_packet_original_timestamp);
                        if (vp) {
                                vp->vp_date = fr_unix_time_from_sec(timestamp);
                                fr_dcursor_append(&cursor, vp);
                        }
                        goto next;
                }
 
                /*
                 *      This should also have been caught.
                 */
                if (strncasecmp((char const *) p, "Donestamp", 9) == 0) {
                        goto next;
                }
 
                /*
                 *      Ensure temporary list is empty before each use
                 */
                fr_pair_list_free(&tmp_list);
 
                /*
                 *      Reinitialize every time.
                 *
                 *      @todo - maybe we want to keep "relative' around between lines?
                 *      So that the detail file reader can read:
                 *
                 *              foo = {}
                 *              .bar = baz
                 *
                 *      and get
                 *
                 *              foo = { bar = baz }
                 *
                 *      But doing that would require updating the
                 *      detail file writer to track parent / child
                 *      relationships, which we're not yet prepared to
                 *      do.
                 *
                 *      @todo - this also doesn't create nested attributes properly,
                 *      as the write will write:
                 *
                 *              foo.bar = baz
                 *
                 *      and then the final pair "foo" is _appended_ to the input list, without paying
                 *      any attention to what's going on!
                 *
                 *      We likely just want to pass in request_pairs the parse function, AND also don't
                 *      mash "relative" between calls.
                 */
                root = (fr_pair_parse_t) {
                        .ctx = request->request_ctx,
                        .da = fr_dict_root(request->proto_dict),
                        .list = &tmp_list,
                };
                relative = (fr_pair_parse_t) { };
 
                if ((fr_pair_list_afrom_substr(&root, &relative,
                                               &FR_SBUFF_IN((char const *) p, (data + data_len) - p)) > 0) && !fr_pair_list_empty(&tmp_list)) {
                        vp = fr_pair_list_head(&tmp_list);
                        fr_pair_list_append(&request->request_pairs, &tmp_list);
                } else {
                        vp = NULL;
                        RWDEBUG("Ignoring line %d - :%s", lineno, p);
                }
 
                /*
                 *      Set the original src/dst ip/port
                 */
                if (vp) {
                        if (vp->da == attr_packet_src_ip_address) {
                                request->packet->socket.inet.src_ipaddr = vp->vp_ip;
                        } else if (vp->da == attr_packet_dst_ip_address) {
                                request->packet->socket.inet.dst_ipaddr = vp->vp_ip;
                        } else if (vp->da == attr_packet_src_port) {
                                request->packet->socket.inet.src_port = vp->vp_uint16;
                        } else if (vp->da == attr_packet_dst_port) {
                                request->packet->socket.inet.dst_port = vp->vp_uint16;
                        }
                }
 
        next:
                lineno++;
                while ((p < end) && (*p)) p++;
        }
 
        /*
         *      Let the app_io take care of populating additional fields in the request
         */
        return inst->app_io->decode(inst->app_io_instance, request, data, data_len);
}
 
static ssize_t mod_encode(UNUSED void const *instance, request_t *request, uint8_t *buffer, size_t buffer_len)
{
        if (buffer_len < 1) return -1;
 
        *buffer = request->reply->code;
        return 1;
}
 
static int mod_priority_set(void const *instance, UNUSED uint8_t const *buffer, UNUSED size_t buflen)
{
        proto_detail_t const *inst = talloc_get_type_abort_const(instance, proto_detail_t);
 
        /*
         *      Return the configured priority.
         */
        return inst->priority;
}
 
 
/** Open listen sockets/connect to external event source
 *
 * @param[in] instance  Ctx data for this application.
 * @param[in] sc        to add our file descriptor to.
 * @param[in] conf      Listen section parsed to give us instance.
 * @return
 *      - 0 on success.
 *      - -1 on failure.
 */
static int mod_open(void *instance, fr_schedule_t *sc, CONF_SECTION *conf)
{
        fr_listen_t     *li;
        proto_detail_t  *inst = talloc_get_type_abort(instance, proto_detail_t);
 
        /*
         *      Build the #fr_listen_t.  This describes the complete
         *      path, data takes from the socket to the decoder and
         *      back again.
         */
        MEM(li = talloc_zero(inst, fr_listen_t));       /* Assigned thread steals the memory */
        talloc_set_destructor(li, fr_io_listen_free);
 
        li->app_io = inst->app_io;
        li->thread_instance = talloc_zero_array(li, uint8_t, li->app_io->common.thread_inst_size);
        talloc_set_name(li->thread_instance, "proto_%s_thread_t", inst->app_io->common.name);
        li->app_io_instance = inst->app_io_instance;
 
        li->app = &proto_detail;
        li->app_instance = instance;
        li->server_cs = inst->server_cs;
 
        /*
         *      Set configurable parameters for message ring buffer.
         */
        li->default_message_size = inst->max_packet_size;
        li->num_messages = inst->num_messages;
 
        /*
         *      Open the file.
         */
        if (inst->app_io->open(li) < 0) {
                cf_log_err(conf, "Failed opening %s file", inst->app_io->common.name);
                talloc_free(li);
                return -1;
        }
 
        fr_assert(li->app_io->get_name);
        li->name = li->app_io->get_name(li);
 
        /*
         *      Testing: allow it to read a "detail.work" file
         *      directly.
         */
        if (strcmp(inst->io_submodule->module->dl->name, "proto_detail_work") == 0) {
                if (!fr_schedule_listen_add(sc, li)) {
                        talloc_free(li);
                        return -1;
                }
 
                inst->listen = li;
                return 0;
        }
 
        if (li->non_socket_listener) {
                /*
                 *      Add listener.  Will insert polling timer.
                 */
                if (!fr_schedule_listen_add(sc, li)) {
                        talloc_free(li);
                        return -1;
                }
        } else {
                /*
                 *      Watch the directory for changes.
                 */
                if (!fr_schedule_directory_add(sc, li)) {
                        talloc_free(li);
                        return -1;
                }
        }
 
        DEBUG("Listening on %s bound to virtual server %s",
              li->name, cf_section_name2(li->server_cs));
 
        inst->listen = li;      /* Probably won't need it, but doesn't hurt */
        inst->sc = sc;
 
        return 0;
}
 
 
/** Instantiate the application
 *
 * Instantiate I/O and type submodules.
 *
 * @return
 *      - 0 on success.
 *      - -1 on failure.
 */
static int mod_instantiate(module_inst_ctx_t const *mctx)
{
        proto_detail_t          *inst = talloc_get_type_abort(mctx->mi->data, proto_detail_t);
        CONF_SECTION            *conf = mctx->mi->conf;
 
        /*
         *      The listener is inside of a virtual server.
         */
        inst->server_cs = cf_item_to_section(cf_parent(conf));
        inst->self = &proto_detail;
 
        /*
         *      No IO module, it's an empty listener.  That's not
         *      allowed for the detail file reader.
         */
        if (!inst->io_submodule) {
                cf_log_err(conf, "Virtual server for detail files requires a 'transport' configuration");
                return -1;
        }
 
        /*
         *      Bootstrap the I/O module
         */
        inst->app_io = (fr_app_io_t const *) inst->io_submodule->exported;
        inst->app_io_instance = inst->io_submodule->data;
        inst->app_io_conf = inst->io_submodule->conf;
 
        /*
         *      These configuration items are not printed by default,
         *      because normal people shouldn't be touching them.
         */
        if (!inst->max_packet_size) inst->max_packet_size = inst->app_io->default_message_size;
 
        if (!inst->num_messages) inst->num_messages = 2;
 
        FR_INTEGER_BOUND_CHECK("num_messages", inst->num_messages, >=, 2);
        FR_INTEGER_BOUND_CHECK("num_messages", inst->num_messages, <=, 65535);
 
        FR_INTEGER_BOUND_CHECK("max_packet_size", inst->max_packet_size, >=, 1024);
        FR_INTEGER_BOUND_CHECK("max_packet_size", inst->max_packet_size, <=, 65536);
 
        if (!inst->priority) inst->priority = PRIORITY_NORMAL;
 
        return 0;
}
 
fr_app_t proto_detail = {
        .common = {
                .magic                  = MODULE_MAGIC_INIT,
                .name                   = "detail",
                .config                 = proto_detail_config,
                .inst_size              = sizeof(proto_detail_t),
 
                .instantiate            = mod_instantiate,
        },
        .open                   = mod_open,
        .decode                 = mod_decode,
        .encode                 = mod_encode,
        .priority               = mod_priority_set
};