radclient-ng.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: 8be4f61b752a38f44c59b428a66fe8945ed65347 $
 *
 * @file src/bin/radclient.c
 * @brief General radius client and debug tool.
 *
 * @copyright 2000,2006,2014 The FreeRADIUS server project
 * @copyright 2000 Miquel van Smoorenburg (miquels@cistron.nl)
 * @copyright 2000 Alan DeKok (aland@freeradius.org)
 */
 
RCSID("$Id: 8be4f61b752a38f44c59b428a66fe8945ed65347 $")
 
#include <freeradius-devel/util/conf.h>
#include <freeradius-devel/util/syserror.h>
#include <freeradius-devel/util/atexit.h>
#include <freeradius-devel/util/pair_legacy.h>
#include <freeradius-devel/util/time.h>
#include <freeradius-devel/util/event.h>
#include <freeradius-devel/server/packet.h>
#include <freeradius-devel/radius/list.h>
#include <freeradius-devel/radius/radius.h>
#include <freeradius-devel/util/chap.h>
#include <freeradius-devel/radius/client.h>
 
#ifdef HAVE_OPENSSL_SSL_H
#include <openssl/ssl.h>
#endif
#include <ctype.h>
 
#ifdef HAVE_GETOPT_H
#  include <getopt.h>
#endif
 
#include <assert.h>
 
typedef struct request_s request_t;     /* to shut up warnings about mschap.h */
 
#include "smbdes.h"
#include "mschap.h"
 
#include "radclient.h"
 
#define pair_update_request(_attr, _da) do { \
                _attr = fr_pair_find_by_da(&request->request_pairs, NULL, _da); \
                if (!_attr) { \
                        _attr = fr_pair_afrom_da(request, _da); \
                        fr_assert(_attr != NULL); \
                        fr_pair_append(&request->request_pairs, _attr); \
                } \
        } while (0)
 
static char *secret = NULL;
static bool do_output = true;
 
static const char *attr_coa_filter_name = "User-Name";
 
static rc_stats_t stats;
 
static int packet_code = FR_RADIUS_CODE_UNDEFINED;
static int resend_count = 1;
static bool print_filename = false;
 
static int forced_id = -1;
static size_t parallel = 1;
static bool paused = false;
 
static fr_bio_fd_config_t fd_config;
 
static fr_radius_client_config_t client_config;
 
static fr_bio_packet_t *client_bio = NULL;
 
static fr_radius_client_bio_info_t const *client_info = NULL;
 
static int ipproto = IPPROTO_UDP;
 
static bool do_coa = false;
//static int coafd;
static int coa_port = FR_COA_UDP_PORT;
static fr_rb_tree_t *coa_tree = NULL;
 
static fr_dlist_head_t rc_request_list;
static rc_request_t     *current = NULL;
 
static char const *radclient_version = RADIUSD_VERSION_BUILD("radclient");
 
static fr_dict_t const *dict_freeradius;
static fr_dict_t const *dict_radius;
 
static TALLOC_CTX       *autofree = NULL;
 
extern fr_dict_autoload_t radclient_dict[];
fr_dict_autoload_t radclient_dict[] = {
        { .out = &dict_freeradius, .proto = "freeradius" },
        { .out = &dict_radius, .proto = "radius" },
        { NULL }
};
 
static fr_dict_attr_t const *attr_cleartext_password;
 
static fr_dict_attr_t const *attr_ms_chap_challenge;
static fr_dict_attr_t const *attr_ms_chap_password;
static fr_dict_attr_t const *attr_ms_chap_response;
 
static fr_dict_attr_t const *attr_radclient_test_name;
static fr_dict_attr_t const *attr_request_authenticator;
 
static fr_dict_attr_t const *attr_chap_password;
static fr_dict_attr_t const *attr_chap_challenge;
static fr_dict_attr_t const *attr_packet_type;
static fr_dict_attr_t const *attr_user_name;
static fr_dict_attr_t const *attr_user_password;
 
static fr_dict_attr_t const *attr_radclient_coa_filename;
static fr_dict_attr_t const *attr_radclient_coa_filter;
 
static fr_dict_attr_t const *attr_coa_filter = NULL;
 
extern fr_dict_attr_autoload_t radclient_dict_attr[];
fr_dict_attr_autoload_t radclient_dict_attr[] = {
        { .out = &attr_cleartext_password, .name = "Password.Cleartext", .type = FR_TYPE_STRING, .dict = &dict_freeradius },
        { .out = &attr_ms_chap_challenge, .name = "Vendor-Specific.Microsoft.CHAP-Challenge", .type = FR_TYPE_OCTETS, .dict = &dict_radius },
        { .out = &attr_ms_chap_password, .name = "Password.MS-CHAP", .type = FR_TYPE_STRING, .dict = &dict_freeradius },
        { .out = &attr_ms_chap_response, .name = "Vendor-Specific.Microsoft.CHAP-Response", .type = FR_TYPE_OCTETS, .dict = &dict_radius },
 
        { .out = &attr_radclient_test_name, .name = "Radclient-Test-Name", .type = FR_TYPE_STRING, .dict = &dict_freeradius },
        { .out = &attr_request_authenticator, .name = "Request-Authenticator", .type = FR_TYPE_OCTETS, .dict = &dict_freeradius },
 
        { .out = &attr_radclient_coa_filename, .name = "Radclient-CoA-Filename", .type = FR_TYPE_STRING, .dict = &dict_freeradius },
        { .out = &attr_radclient_coa_filter, .name = "Radclient-CoA-Filter", .type = FR_TYPE_STRING, .dict = &dict_freeradius },
 
        { .out = &attr_chap_password, .name = "CHAP-Password", .type = FR_TYPE_OCTETS, .dict = &dict_radius },
        { .out = &attr_chap_challenge, .name = "CHAP-Challenge", .type = FR_TYPE_OCTETS, .dict = &dict_radius },
        { .out = &attr_packet_type, .name = "Packet-Type", .type = FR_TYPE_UINT32, .dict = &dict_radius },
        { .out = &attr_user_password, .name = "User-Password", .type = FR_TYPE_STRING, .dict = &dict_radius },
        { .out = &attr_user_name, .name = "User-Name", .type = FR_TYPE_STRING, .dict = &dict_radius },
 
        { NULL }
};
 
static NEVER_RETURNS void usage(void)
{
        fprintf(stderr, "Usage: radclient [options] server[:port] <command> [<secret>]\n");
 
        fprintf(stderr, "  <command>                         One of auth, acct, status, coa, disconnect or auto.\n");
        fprintf(stderr, "  -4                                Use IPv4 address of server\n");
        fprintf(stderr, "  -6                                Use IPv6 address of server.\n");
        fprintf(stderr, "  -A <attribute>                    Use named 'attribute' to match CoA requests to packets.  Default is User-Name\n");
        fprintf(stderr, "  -C [<client_ip>:]<client_port>    Client source port and source IP address.  Port values may be 1..65535\n");
        fprintf(stderr, "  -c <count>                        Send each packet 'count' times.\n");
        fprintf(stderr, "  -d <raddb>                        Set user dictionary directory (defaults to " RADDBDIR ").\n");
        fprintf(stderr, "  -D <dictdir>                      Set main dictionary directory (defaults to " DICTDIR ").\n");
        fprintf(stderr, "  -f <file>[:<file>]                Read packets from file, not stdin.\n");
        fprintf(stderr, "                                    If a second file is provided, it will be used to verify responses\n");
        fprintf(stderr, "  -F                                Print the file name, packet number and reply code.\n");
        fprintf(stderr, "  -h                                Print usage help information.\n");
        fprintf(stderr, "  -i <id>                           Set request id to 'id'.  Values may be 0..255\n");
        fprintf(stderr, "  -o <port>                         Set CoA listening port (defaults to 3799)\n");
        fprintf(stderr, "  -p <num>                          Send 'num' packets from a file in parallel.\n");
        fprintf(stderr, "  -P <proto>                        Use proto (tcp or udp) for transport.\n");
        fprintf(stderr, "  -r <retries>                      If timeout, retry sending the packet 'retries' times.\n");
        fprintf(stderr, "  -s                                Print out summary information of auth results.\n");
        fprintf(stderr, "  -S <file>                         read secret from file, not command line.\n");
        fprintf(stderr, "  -t <timeout>                      Wait 'timeout' seconds before retrying (may be a floating point number).\n");
        fprintf(stderr, "  -v                                Show program version information.\n");
        fprintf(stderr, "  -x                                Debugging mode.\n");
 
        fr_exit_now(EXIT_SUCCESS);
}
 
/*
 *      Free a radclient struct, which may (or may not)
 *      already be in the list.
 */
static int _rc_request_free(rc_request_t *request)
{
        fr_dlist_remove(&rc_request_list, request);
 
        if (do_coa) {
                (void) fr_rb_delete(coa_tree, &request->node);
                // @todo - cancel incoming CoA packet/
        }
 
        if (request->packet && (request->packet->id >= 0)) {
                (void) fr_radius_client_fd_bio_cancel(client_bio, request->packet);
        }
 
        return 0;
}
 
#ifdef HAVE_OPENSSL_SSL_H
#include <openssl/provider.h>
 
static OSSL_PROVIDER *openssl_default_provider = NULL;
static OSSL_PROVIDER *openssl_legacy_provider = NULL;
 
static int openssl3_init(void)
{
        /*
         *      Load the default provider for most algorithms
         */
        openssl_default_provider = OSSL_PROVIDER_load(NULL, "default");
        if (!openssl_default_provider) {
                ERROR("(TLS) Failed loading default provider");
                return -1;
        }
 
        /*
         *      Needed for MD4
         *
         *      https://www.openssl.org/docs/man3.0/man7/migration_guide.html#Legacy-Algorithms
         */
        openssl_legacy_provider = OSSL_PROVIDER_load(NULL, "legacy");
        if (!openssl_legacy_provider) {
                ERROR("(TLS) Failed loading legacy provider");
                return -1;
        }
 
        return 0;
}
 
static void openssl3_free(void)
{
        if (openssl_default_provider && !OSSL_PROVIDER_unload(openssl_default_provider)) {
                ERROR("Failed unloading default provider");
        }
        openssl_default_provider = NULL;
 
        if (openssl_legacy_provider && !OSSL_PROVIDER_unload(openssl_legacy_provider)) {
                ERROR("Failed unloading legacy provider");
        }
        openssl_legacy_provider = NULL;
}
#else
#define openssl3_init()
#define openssl3_free()
#endif
 
static int _loop_status(UNUSED fr_time_t now, fr_time_delta_t wake, UNUSED void *ctx)
{
        if (fr_time_delta_unwrap(wake) < (NSEC / 10)) return 0;
 
        if (fr_dlist_num_elements(&rc_request_list) != 0) return 0;
 
        fr_log(&default_log, L_DBG, __FILE__, __LINE__, "Main loop waking up in %pV seconds", fr_box_time_delta(wake));
 
        return 0;
}
 
static int mschapv1_encode(fr_packet_t *packet, fr_pair_list_t *list,
                           char const *password)
{
        unsigned int            i;
        uint8_t                 *p;
        fr_pair_t               *challenge, *reply;
        uint8_t                 nthash[16];
 
        fr_pair_delete_by_da(list, attr_ms_chap_challenge);
        fr_pair_delete_by_da(list, attr_ms_chap_response);
 
        MEM(challenge = fr_pair_afrom_da(packet, attr_ms_chap_challenge));
 
        fr_pair_append(list, challenge);
 
        MEM(p = talloc_array(challenge, uint8_t, 8));
        fr_pair_value_memdup_buffer_shallow(challenge, p, false);
 
        for (i = 0; i < challenge->vp_length; i++) {
                p[i] = fr_rand();
        }
 
        MEM(reply = fr_pair_afrom_da(packet, attr_ms_chap_response));
        fr_pair_append(list, reply);
        p = talloc_zero_array(reply, uint8_t, 50); /* really reply->da->flags.length */
        fr_pair_value_memdup_buffer_shallow(reply, p, false);
 
        p[1] = 0x01; /* NT hash */
 
        if (mschap_nt_password_hash(nthash, password) < 0) return 0;
 
        smbdes_mschap(nthash, challenge->vp_octets, p + 26);
        return 1;
}
 
 
static int getport(char const *name)
{
        struct servent *svp;
 
        svp = getservbyname(name, "udp");
        if (!svp) return 0;
 
        return ntohs(svp->s_port);
}
 
/*
 *      Set a port from the request type if we don't already have one
 */
static void radclient_get_port(fr_radius_packet_code_t type, uint16_t *port)
{
        switch (type) {
        default:
        case FR_RADIUS_CODE_ACCESS_REQUEST:
        case FR_RADIUS_CODE_ACCESS_CHALLENGE:
        case FR_RADIUS_CODE_STATUS_SERVER:
                if (*port == 0) *port = getport("radius");
                if (*port == 0) *port = FR_AUTH_UDP_PORT;
                return;
 
        case FR_RADIUS_CODE_ACCOUNTING_REQUEST:
                if (*port == 0) *port = getport("radacct");
                if (*port == 0) *port = FR_ACCT_UDP_PORT;
                return;
 
        case FR_RADIUS_CODE_DISCONNECT_REQUEST:
                if (*port == 0) *port = FR_POD_UDP_PORT;
                return;
 
        case FR_RADIUS_CODE_COA_REQUEST:
                if (*port == 0) *port = FR_COA_UDP_PORT;
                return;
 
        case FR_RADIUS_CODE_UNDEFINED:
                if (*port == 0) *port = 0;
                return;
        }
}
 
/*
 *      Resolve a port to a request type
 */
static fr_radius_packet_code_t radclient_get_code(uint16_t port)
{
        /*
         *      getport returns 0 if the service doesn't exist
         *      so we need to return early, to avoid incorrect
         *      codes.
         */
        if (port == 0) return FR_RADIUS_CODE_UNDEFINED;
 
        if ((port == getport("radius")) || (port == FR_AUTH_UDP_PORT) || (port == FR_AUTH_UDP_PORT_ALT)) {
                return FR_RADIUS_CODE_ACCESS_REQUEST;
        }
        if ((port == getport("radacct")) || (port == FR_ACCT_UDP_PORT) || (port == FR_ACCT_UDP_PORT_ALT)) {
                return FR_RADIUS_CODE_ACCOUNTING_REQUEST;
        }
        if (port == FR_COA_UDP_PORT) return FR_RADIUS_CODE_COA_REQUEST;
 
        return FR_RADIUS_CODE_UNDEFINED;
}
 
 
static bool already_hex(fr_pair_t *vp)
{
        size_t i;
 
        if (!vp || (vp->vp_type != FR_TYPE_OCTETS)) return true;
 
        /*
         *      If it's 17 octets, it *might* be already encoded.
         *      Or, it might just be a 17-character password (maybe UTF-8)
         *      Check it for non-printable characters.  The odds of ALL
         *      of the characters being 32..255 is (1-7/8)^17, or (1/8)^17,
         *      or 1/(2^51), which is pretty much zero.
         */
        for (i = 0; i < vp->vp_length; i++) {
                if (vp->vp_octets[i] < 32) {
                        return true;
                }
        }
 
        return false;
}
 
/*
 *      Read one CoA reply and possibly filter
 */
static int coa_init(rc_request_t *parent, FILE *coa_reply, char const *reply_filename, bool *coa_reply_done, FILE *coa_filter, char const *filter_filename, bool *coa_filter_done)
{
        rc_request_t    *request;
        fr_pair_t       *vp;
 
        /*
         *      Allocate it.
         */
        MEM(request = talloc_zero(parent, rc_request_t));
        MEM(request->reply = fr_packet_alloc(request, false));
 
        /*
         *      Don't initialize src/dst IP/port, or anything else.  That will be read from the network.
         */
        fr_pair_list_init(&request->filter);
        fr_pair_list_init(&request->request_pairs);
        fr_pair_list_init(&request->reply_pairs);
 
        /*
         *      Read the reply VP's.
         */
        if (fr_pair_list_afrom_file(request, dict_radius,
                                    &request->reply_pairs, coa_reply, coa_reply_done) < 0) {
                REDEBUG("Error parsing \"%s\"", reply_filename);
        error:
                talloc_free(request);
                return -1;
        }
 
        /*
         *      The reply can be empty.  In which case we just send an empty ACK.
         */
        vp = fr_pair_find_by_da(&request->reply_pairs, NULL, attr_packet_type);
        if (vp) request->reply->code = vp->vp_uint32;
 
        /*
         *      Read in filter VP's.
         */
        if (coa_filter) {
                if (fr_pair_list_afrom_file(request, dict_radius,
                                            &request->filter, coa_filter, coa_filter_done) < 0) {
                        REDEBUG("Error parsing \"%s\"", filter_filename);
                        goto error;
                }
 
                if (*coa_filter_done && !*coa_reply_done) {
                        REDEBUG("Differing number of replies/filters in %s:%s "
                                "(too many replies))", reply_filename, filter_filename);
                        goto error;
                }
 
                if (!*coa_filter_done && *coa_reply_done) {
                        REDEBUG("Differing number of replies/filters in %s:%s "
                                "(too many filters))", reply_filename, filter_filename);
                        goto error;
                }
 
                /*
                 *      This allows efficient list comparisons later
                 */
                fr_pair_list_sort(&request->filter, fr_pair_cmp_by_da);
        }
 
        request->name = parent->name;
 
        /*
         *      Automatically set the response code from the request code
         *      (if one wasn't already set).
         */
        if (request->filter_code == FR_RADIUS_CODE_UNDEFINED) {
                request->filter_code = FR_RADIUS_CODE_COA_REQUEST;
        }
 
        parent->coa = request;
 
        /*
         *      Ensure that the packet is also tracked in the CoA tree.
         */
        fr_assert(coa_tree);
        if (!fr_rb_insert(coa_tree, parent)) {
                ERROR("Failed inserting packet from %s into CoA tree", request->name);
                fr_exit_now(EXIT_FAILURE);
        }
 
        return 0;
}
 
/*
 *      Initialize a radclient data structure and add it to
 *      the global linked list.
 */
static int radclient_init(TALLOC_CTX *ctx, rc_file_pair_t *files)
{
        FILE            *packets, *filters = NULL;
 
        fr_pair_t       *vp;
        rc_request_t    *request = NULL;
        bool            packets_done = false;
        uint64_t        num = 0;
 
        FILE            *coa_reply = NULL;
        FILE            *coa_filter = NULL;
        bool            coa_reply_done = false;
        bool            coa_filter_done = false;
 
        fr_assert(files->packets != NULL);
 
        /*
         *      Determine where to read the VP's from.
         */
        if (strcmp(files->packets, "-") != 0) {
                packets = fopen(files->packets, "r");
                if (!packets) {
                        ERROR("Error opening %s: %s", files->packets, fr_syserror(errno));
                        return -1;
                }
 
                /*
                 *      Read in the pairs representing the expected response.
                 */
                if (files->filters) {
                        filters = fopen(files->filters, "r");
                        if (!filters) {
                                ERROR("Error opening %s: %s", files->filters, fr_syserror(errno));
                                goto error;
                        }
                }
 
                if (files->coa_reply) {
                        coa_reply = fopen(files->coa_reply, "r");
                        if (!coa_reply) {
                                ERROR("Error opening %s: %s", files->coa_reply, fr_syserror(errno));
                                goto error;
                        }
                }
 
                if (files->coa_filter) {
                        coa_filter = fopen(files->coa_filter, "r");
                        if (!coa_filter) {
                                ERROR("Error opening %s: %s", files->coa_filter, fr_syserror(errno));
                                goto error;
                        }
                }
        } else {
                packets = stdin;
        }
 
        /*
         *      Loop until the file is done.
         */
        do {
                char const *coa_reply_filename = NULL;
                char const *coa_filter_filename = NULL;
 
                /*
                 *      Allocate it.
                 */
                MEM(request = talloc_zero(ctx, rc_request_t));
                MEM(request->packet = fr_packet_alloc(request, true));
                request->packet->uctx = request;
 
                /*
                 *      Don't set request->packet->socket.  The underlying socket isn't open yet.
                 */
 
                request->files = files;
                request->packet->id = -1;
                request->num = num++;
 
                fr_pair_list_init(&request->filter);
                fr_pair_list_init(&request->request_pairs);
                fr_pair_list_init(&request->reply_pairs);
 
                /*
                 *      Read the request VP's.
                 */
                if (fr_pair_list_afrom_file(request, dict_radius,
                                            &request->request_pairs, packets, &packets_done) < 0) {
                        char const *input;
 
                        if ((files->packets[0] == '-') && (files->packets[1] == '\0')) {
                                input = "stdin";
                        } else {
                                input = files->packets;
                        }
 
                        REDEBUG("Error parsing \"%s\"", input);
                        goto error;
                }
 
                /*
                 *      Skip empty entries
                 */
                if (fr_pair_list_empty(&request->request_pairs)) {
                        WARN("Skipping \"%s\": No Attributes", files->packets);
                        talloc_free(request);
                        continue;
                }
 
                /*
                 *      Read in filter VP's.
                 */
                if (filters) {
                        bool filters_done;
 
                        if (fr_pair_list_afrom_file(request, dict_radius,
                                                    &request->filter, filters, &filters_done) < 0) {
                                REDEBUG("Error parsing \"%s\"", files->filters);
                                goto error;
                        }
 
                        if (filters_done && !packets_done) {
                                REDEBUG("Differing number of packets/filters in %s:%s "
                                        "(too many requests))", files->packets, files->filters);
                                goto error;
                        }
 
                        if (!filters_done && packets_done) {
                                REDEBUG("Differing number of packets/filters in %s:%s "
                                        "(too many filters))", files->packets, files->filters);
                                goto error;
                        }
 
                        vp = fr_pair_find_by_da(&request->filter, NULL, attr_packet_type);
                        if (vp) {
                                request->filter_code = vp->vp_uint32;
                                fr_pair_delete(&request->filter, vp);
                        }
 
                        /*
                         *      This allows efficient list comparisons later
                         */
                        fr_pair_list_sort(&request->filter, fr_pair_cmp_by_da);
                }
 
                /*
                 *      Process special attributes
                 */
                for (vp = fr_pair_list_head(&request->request_pairs);
                     vp;
                     vp = fr_pair_list_next(&request->request_pairs, vp)) {
                        /*
                         *      Allow it to set the packet type in
                         *      the attributes read from the file.
                         */
                        if (vp->da == attr_packet_type) {
                                request->packet->code = vp->vp_uint32;
                        } else if (vp->da == attr_request_authenticator) {
                                if (vp->vp_length > sizeof(request->packet->vector)) {
                                        memcpy(request->packet->vector, vp->vp_octets, sizeof(request->packet->vector));
                                } else {
                                        memset(request->packet->vector, 0, sizeof(request->packet->vector));
                                        memcpy(request->packet->vector, vp->vp_octets, vp->vp_length);
                                }
                        } else if (vp->da == attr_cleartext_password) {
                                request->password = vp;
                        /*
                         *      Keep a copy of the the password attribute.
                         */
                        } else if (vp->da == attr_chap_password) {
                                /*
                                 *      If it's already hex, do nothing.
                                 */
                                if ((vp->vp_length == 17) && (already_hex(vp))) continue;
 
                                /*
                                 *      CHAP-Password is octets, so it may not be zero terminated.
                                 */
                                pair_update_request(request->password, attr_cleartext_password);
                                fr_pair_value_bstrndup(request->password, vp->vp_strvalue, vp->vp_length, true);
                        } else if ((vp->da == attr_user_password) ||
                                   (vp->da == attr_ms_chap_password)) {
                                pair_update_request(request->password, attr_cleartext_password);
                                fr_pair_value_bstrndup(request->password, vp->vp_strvalue, vp->vp_length, true);
 
                        } else if (vp->da == attr_radclient_test_name) {
                                request->name = vp->vp_strvalue;
 
                        } else if (vp->da == attr_radclient_coa_filename) {
                                coa_reply_filename = vp->vp_strvalue;
 
                        } else if (vp->da == attr_radclient_coa_filter) {
                                coa_filter_filename = vp->vp_strvalue;
                        }
                } /* loop over the VP's we read in */
 
                /*
                 *      Use the default set on the command line
                 */
                if (request->packet->code == FR_RADIUS_CODE_UNDEFINED) request->packet->code = packet_code;
 
                /*
                 *      Fill in the packet header from attributes, and then
                 *      re-realize the attributes.
                 */
                fr_packet_net_from_pairs(request->packet, &request->request_pairs);
 
                /*
                 *      Default to the filename
                 */
                if (!request->name) request->name = request->files->packets;
 
                /*
                 *      Automatically set the response code from the request code
                 *      (if one wasn't already set).
                 */
                if (request->filter_code == FR_RADIUS_CODE_UNDEFINED) {
                        switch (request->packet->code) {
                        case FR_RADIUS_CODE_ACCESS_REQUEST:
                                request->filter_code = FR_RADIUS_CODE_ACCESS_ACCEPT;
                                break;
 
                        case FR_RADIUS_CODE_ACCOUNTING_REQUEST:
                                request->filter_code = FR_RADIUS_CODE_ACCOUNTING_RESPONSE;
                                break;
 
                        case FR_RADIUS_CODE_COA_REQUEST:
                                request->filter_code = FR_RADIUS_CODE_COA_ACK;
                                break;
 
                        case FR_RADIUS_CODE_DISCONNECT_REQUEST:
                                request->filter_code = FR_RADIUS_CODE_DISCONNECT_ACK;
                                break;
 
                        case FR_RADIUS_CODE_STATUS_SERVER:
                                request->filter_code = FR_RADIUS_CODE_UNDEFINED;
                                break;
 
                        case FR_RADIUS_CODE_UNDEFINED:
                                REDEBUG("Packet-Type must be defined,"
                                        "or a well known RADIUS port");
                                goto error;
 
                        default:
                                REDEBUG("Can't determine expected &reply.Packet-Type for Packet-Type %i",
                                        request->packet->code);
                                goto error;
                        }
                /*
                 *      Automatically set the request code from the response code
                 *      (if one wasn't already set).
                 */
                } else if (request->packet->code == FR_RADIUS_CODE_UNDEFINED) {
                        switch (request->filter_code) {
                        case FR_RADIUS_CODE_ACCESS_ACCEPT:
                        case FR_RADIUS_CODE_ACCESS_REJECT:
                                request->packet->code = FR_RADIUS_CODE_ACCESS_REQUEST;
                                break;
 
                        case FR_RADIUS_CODE_ACCOUNTING_RESPONSE:
                                request->packet->code = FR_RADIUS_CODE_ACCOUNTING_REQUEST;
                                break;
 
                        case FR_RADIUS_CODE_DISCONNECT_ACK:
                        case FR_RADIUS_CODE_DISCONNECT_NAK:
                                request->packet->code = FR_RADIUS_CODE_DISCONNECT_REQUEST;
                                break;
 
                        case FR_RADIUS_CODE_COA_ACK:
                        case FR_RADIUS_CODE_COA_NAK:
                                request->packet->code = FR_RADIUS_CODE_COA_REQUEST;
                                break;
 
                        default:
                                REDEBUG("Can't determine expected Packet-Type for &reply.Packet-Type %i",
                                        request->filter_code);
                                goto error;
                        }
                }
 
                /*
                 *      Automatically set the dst port (if one wasn't already set).
                 */
                radclient_get_port(request->packet->code, &request->packet->socket.inet.dst_port);
                if (request->packet->socket.inet.dst_port == 0) {
                        REDEBUG("Can't determine destination port");
                        goto error;
                }
 
                /*
                 *      We expect different responses for Status-Server, depending on which port is being used.
                 */
                if (request->packet->code == FR_RADIUS_CODE_STATUS_SERVER) {
                        switch (radclient_get_code(request->packet->socket.inet.dst_port)) {
                        case FR_RADIUS_CODE_ACCESS_REQUEST:
                                request->filter_code = FR_RADIUS_CODE_ACCESS_ACCEPT;
                                break;
 
                        case FR_RADIUS_CODE_ACCOUNTING_REQUEST:
                                request->filter_code = FR_RADIUS_CODE_ACCOUNTING_RESPONSE;
                                break;
 
                        default:
                                request->filter_code = FR_RADIUS_CODE_UNDEFINED;
                                break;
                        }
                }
 
                /*
                 *      Read in the CoA filename and filter.
                 */
                if (coa_reply_filename) {
                        if (coa_reply) {
                                RDEBUG("Cannot specify CoA file on both the command line and via Radclient-CoA-Filename");
                                goto error;
                        }
 
                        coa_reply = fopen(coa_reply_filename, "r");
                        if (!coa_reply) {
                                ERROR("Error opening %s: %s", coa_reply_filename, fr_syserror(errno));
                                goto error;
                        }
 
                        if (coa_filter_filename) {
                                coa_filter = fopen(coa_filter_filename, "r");
                                if (!coa_filter) {
                                        ERROR("Error opening %s: %s", coa_filter_filename, fr_syserror(errno));
                                        goto error;
                                }
                        } else {
                                coa_filter = NULL;
                        }
 
                        if (coa_init(request, coa_reply, coa_reply_filename, &coa_reply_done,
                                     coa_filter, coa_filter_filename, &coa_filter_done) < 0) {
                                goto error;
                        }
 
                        fclose(coa_reply);
                        coa_reply = NULL;
                        if (coa_filter) {
                                fclose(coa_filter);
                                coa_filter = NULL;
                        }
                        do_coa = true;
 
                } else if (coa_reply) {
                        if (coa_init(request, coa_reply, coa_reply_filename, &coa_reply_done,
                                     coa_filter, coa_filter_filename, &coa_filter_done) < 0) {
                                goto error;
                        }
 
                        if (coa_reply_done != packets_done) {
                                REDEBUG("Differing number of packets in input file and coa_reply in %s:%s ",
                                        files->packets, files->coa_reply);
                                goto error;
 
                        }
                }
 
                /*
                 *      Add it to the tail of the list.
                 */
                fr_dlist_insert_tail(&rc_request_list, request);
 
                /*
                 *      Set the destructor so it removes itself from the
                 *      request list when freed. We don't set this until
                 *      the packet is actually in the list, else we trigger
                 *      the asserts in the free callback.
                 */
                talloc_set_destructor(request, _rc_request_free);
        } while (!packets_done); /* loop until the file is done. */
 
        if (packets != stdin) fclose(packets);
        if (filters) fclose(filters);
        if (coa_reply) fclose(coa_reply);
        if (coa_filter) fclose(coa_filter);
 
        /*
         *      And we're done.
         */
        return 0;
 
error:
        talloc_free(request);
 
        if (packets != stdin) fclose(packets);
        if (filters) fclose(filters);
        if (coa_reply) fclose(coa_reply);
        if (coa_filter) fclose(coa_filter);
 
        return -1;
}
 
 
/*
 *      Sanity check each argument.
 */
static int radclient_sane(rc_request_t *request)
{
        request->packet->socket.inet.src_ipaddr = client_info->fd_info->socket.inet.src_ipaddr;
        request->packet->socket.inet.src_port = client_info->fd_info->socket.inet.src_port;
        request->packet->socket.inet.ifindex = client_info->fd_info->socket.inet.ifindex;
 
        if (request->packet->socket.inet.dst_port == 0) {
                request->packet->socket.inet.dst_port = fd_config.dst_port;
        }
 
        if (request->packet->socket.inet.dst_ipaddr.af == AF_UNSPEC) {
                if (fd_config.dst_ipaddr.af == AF_UNSPEC) {
                        ERROR("No server was given, and request %" PRIu64 " in file %s did not contain "
                              "Packet-Dst-IP-Address", request->num, request->files->packets);
                        return -1;
                }
                request->packet->socket.inet.dst_ipaddr = fd_config.dst_ipaddr;
        }
 
        if (request->packet->code == 0) {
                if (packet_code == -1) {
                        ERROR("Request was \"auto\", and request %" PRIu64 " in file %s did not contain Packet-Type",
                              request->num, request->files->packets);
                        return -1;
                }
                request->packet->code = packet_code;
        }
 
        request->packet->socket.fd = -1;
 
        return 0;
}
 
 
static int8_t request_cmp(void const *one, void const *two)
{
        rc_request_t const *a = one, *b = two;
        fr_pair_t *vp1, *vp2;
 
        vp1 = fr_pair_find_by_da(&a->request_pairs, NULL, attr_coa_filter);
        vp2 = fr_pair_find_by_da(&b->request_pairs, NULL, attr_coa_filter);
 
        if (!vp1) return -1;
        if (!vp2) return +1;
 
        return fr_value_box_cmp(&vp1->data, &vp2->data);
}
 
static void cleanup(fr_bio_packet_t *client, rc_request_t *request)
{
        /*
         *      Don't leave a dangling pointer around.
         */
        if (current == request) {
                current = fr_dlist_prev(&rc_request_list, current);
        }
 
        talloc_free(request);
 
        /*
         *      There are more packets to send, then allow the writer to send them.
         */
        if (fr_dlist_num_elements(&rc_request_list) != 0) {
                return;
        }
 
        /*
         *      We're done all packets, and there's nothing more to read, stop.
         */
        if (fr_radius_client_bio_outstanding(client) == 0) {
                fr_assert(client_config.retry_cfg.el != NULL);
 
                fr_event_loop_exit(client_config.retry_cfg.el, 1);
        }
}
 
static void client_packet_retry_log(UNUSED fr_bio_packet_t *client, fr_packet_t *packet)
{
        rc_request_t *request = packet->uctx;
 
        DEBUG("Timeout - resending packet");
 
        // @todo - log the updated Acct-Delay-Time from the packet?
 
        fr_radius_packet_log(&default_log, request->packet, &request->request_pairs, false);
}
 
static void client_packet_release(fr_bio_packet_t *client, fr_packet_t *packet)
{
        rc_request_t *request = packet->uctx;
 
        ERROR("No reply to packet");
 
        cleanup(client, request);
}
 
 
/*
 *      Send one packet.
 */
static int send_one_packet(fr_bio_packet_t *client, rc_request_t *request)
{
        int rcode;
 
        fr_assert(!request->done);
        fr_assert(request->reply == NULL);
 
#ifdef STATIC_ANALYZER
        if (!secret) fr_exit_now(EXIT_FAILURE);
#endif
 
        fr_assert(request->packet->id < 0);
        fr_assert(request->packet->data == NULL);
 
        /*
         *      Update the password, so it can be encrypted with the
         *      new authentication vector.
         */
        if (request->password) {
                fr_pair_t *vp;
 
                if ((vp = fr_pair_find_by_da(&request->request_pairs, NULL, attr_user_password)) != NULL) {
                        fr_pair_value_strdup(vp, request->password->vp_strvalue, false);
 
                } else if ((vp = fr_pair_find_by_da(&request->request_pairs, NULL, attr_chap_password)) != NULL) {
                        uint8_t         buffer[17];
                        fr_pair_t       *challenge;
                        uint8_t const   *vector;
 
                        /*
                         *      Use Chap-Challenge pair if present,
                         *      Request Authenticator otherwise.
                         */
                        challenge = fr_pair_find_by_da(&request->request_pairs, NULL, attr_chap_challenge);
                        if (challenge && (challenge->vp_length == RADIUS_AUTH_VECTOR_LENGTH)) {
                                vector = challenge->vp_octets;
                        } else {
                                vector = request->packet->vector;
                        }
 
                        fr_chap_encode(buffer,
                                       fr_rand() & 0xff, vector, RADIUS_AUTH_VECTOR_LENGTH,
                                       request->password->vp_strvalue,
                                       request->password->vp_length);
                        fr_pair_value_memdup(vp, buffer, sizeof(buffer), false);
 
                } else if (fr_pair_find_by_da_nested(&request->request_pairs, NULL, attr_ms_chap_password) != NULL) {
                        mschapv1_encode(request->packet, &request->request_pairs, request->password->vp_strvalue);
 
                } else {
                        DEBUG("WARNING: No password in the request");
                }
        }
 
        request->timestamp = fr_time();
        request->tries = 1;
 
        /*
         *      Ensure that each Access-Request is unique.
         */
        if (request->packet->code == FR_RADIUS_CODE_ACCESS_REQUEST) {
                fr_rand_buffer(request->packet->vector, sizeof(request->packet->vector));
        }
 
        /*
         *      Send the current packet.
         */
        rcode = fr_bio_packet_write(client, request, request->packet, &request->request_pairs);
        if (rcode < 0) {
                /*
                 *      Failed writing it.  Try again later.
                 */
                if (rcode == fr_bio_error(IO_WOULD_BLOCK)) return 0;
 
                REDEBUG("Failed writing packet - %s", fr_strerror());
                return -1;
        }
 
        fr_radius_packet_log(&default_log, request->packet, &request->request_pairs, false);
 
        return 0;
}
 
static fr_event_update_t const pause_write[] = {
        FR_EVENT_SUSPEND(fr_event_io_func_t, write),
        { 0 }
};
 
static fr_event_update_t const resume_write[] = {
        FR_EVENT_RESUME(fr_event_io_func_t, write),
        { 0 }
};
 
 
static int client_bio_write_pause(fr_bio_packet_t *bio)
{
        fr_radius_client_bio_info_t const *info = fr_radius_client_bio_info(bio);
 
        if (fr_event_filter_update(client_config.retry_cfg.el, info->fd_info->socket.fd, FR_EVENT_FILTER_IO, pause_write) < 0) {
                return fr_bio_error(GENERIC);
        }
 
        return 0;
}
 
static int client_bio_write_resume(fr_bio_packet_t *bio)
{
        fr_radius_client_bio_info_t const *info = fr_radius_client_bio_info(bio);
 
        if (fr_event_filter_update(client_config.retry_cfg.el, info->fd_info->socket.fd, FR_EVENT_FILTER_IO, resume_write) < 0) {
                return fr_bio_error(GENERIC);
        }
 
        return 1;
}
 
 
static NEVER_RETURNS void client_bio_failed(fr_bio_packet_t *bio)
{
        ERROR("Failed connecting to server");
 
        /*
         *      Cleanly close the BIO, so that we exercise the shutdown path.
         */
        fr_assert(bio == client_bio);
        TALLOC_FREE(bio);
 
        fr_exit_now(EXIT_FAILURE);
}
 
 
static NEVER_RETURNS void client_error(UNUSED fr_event_list_t *el, UNUSED int fd, UNUSED int flags,
                                       int fd_errno, void *uctx)
{
        fr_bio_packet_t *client = uctx;
 
        ERROR("Failed in connection - %s", fr_syserror(fd_errno));
 
        /*
         *      Cleanly close the BIO, so that we exercise the shutdown path.
         */
        fr_assert(client == client_bio);
        TALLOC_FREE(client);
 
        fr_exit_now(EXIT_FAILURE);
}
 
static void client_read(fr_event_list_t *el, int fd, UNUSED int flags, void *uctx)
{
        fr_bio_packet_t *client = uctx;
        rc_request_t *request;
        fr_pair_list_t reply_pairs;
        fr_packet_t *reply;
        int rcode;
 
        fr_pair_list_init(&reply_pairs);
 
        /*
         *      Read one packet.
         */
        rcode = fr_bio_packet_read(client, (void **) &request, &reply, client, &reply_pairs);
        if (rcode < 0) {
                ERROR("Failed reading packet - %s", fr_bio_strerror(rcode));
                fr_exit_now(EXIT_FAILURE);
        }
 
        /*
         *      Not a RADIUS packet, or not a reply to a packet we sent.
         */
        if (!rcode) return;
 
        fr_radius_packet_log(&default_log, reply, &reply_pairs, true);
 
        if (print_filename) {
                RDEBUG("%s response code %d", request->files->packets, reply->code);
        }
 
        /*
         *      Increment counters...
         */
        switch (reply->code) {
        case FR_RADIUS_CODE_ACCESS_ACCEPT:
        case FR_RADIUS_CODE_ACCOUNTING_RESPONSE:
        case FR_RADIUS_CODE_COA_ACK:
        case FR_RADIUS_CODE_DISCONNECT_ACK:
                stats.accepted++;
                break;
 
        case FR_RADIUS_CODE_ACCESS_CHALLENGE:
                break;
 
        default:
                stats.rejected++;
        }
 
        fr_strerror_clear();    /* Clear strerror buffer */
 
        /*
         *      If we had an expected response code, check to see if the
         *      packet matched that.
         */
        if ((request->filter_code != FR_RADIUS_CODE_UNDEFINED) && (reply->code != request->filter_code)) {
                if (FR_RADIUS_PACKET_CODE_VALID(reply->code)) {
                        REDEBUG("%s: Expected %s got %s", request->name, fr_radius_packet_name[request->filter_code],
                                fr_radius_packet_name[reply->code]);
                } else {
                        REDEBUG("%s: Expected %u got %i", request->name, request->filter_code,
                                reply->code);
                }
                stats.failed++;
        /*
         *      Check if the contents of the packet matched the filter
         */
        } else if (fr_pair_list_empty(&request->filter)) {
                stats.passed++;
        } else {
                fr_pair_t const *failed[2];
 
                fr_pair_list_sort(&reply_pairs, fr_pair_cmp_by_da);
                if (fr_pair_validate(failed, &request->filter, &reply_pairs)) {
                        RDEBUG("%s: Response passed filter", request->name);
                        stats.passed++;
                } else {
                        fr_pair_validate_debug(failed);
                        REDEBUG("%s: Response for failed filter", request->name);
                        stats.failed++;
                }
        }
 
        /*
         *      The retry bio takes care of suppressing duplicate replies.
         */
        if (paused) {
                if (fr_event_filter_update(el, fd, FR_EVENT_FILTER_IO, resume_write) < 0) {
                        fr_perror("radclient");
                        fr_exit_now(EXIT_FAILURE);
                }
                paused = false;
        }
 
        /*
         *      If we're not done, then leave this packet in the list for future resending.
         */
        request->done = (request->resend >= resend_count);
        if (!request->done) {
                /*
                 *      We don't care about duplicate replies, they can go away.
                 */
                (void) fr_radius_client_fd_bio_cancel(client, request->packet);
                request->packet->id = -1;
                TALLOC_FREE(request->packet->data);
                return;
        }
 
        fr_packet_free(&reply);
 
        cleanup(client, request);
}
 
static void client_write(fr_event_list_t *el, int fd, UNUSED int flags, void *uctx)
{
        fr_bio_packet_t *client = uctx;
        rc_request_t *request;
 
        request = fr_dlist_next(&rc_request_list, current);
        fr_assert(!paused);
 
        if (!request) request = fr_dlist_head(&rc_request_list);
 
        /*
         *      Nothing more to send, stop trying to write packets.
         */
        if (!request) {
        pause:
                if (fr_event_filter_update(el, fd, FR_EVENT_FILTER_IO, pause_write) < 0) {
                        fr_perror("radclient");
                        fr_exit_now(EXIT_FAILURE);
                }
                return;
        }
 
        /*
         *      No more packets to send, we pause the read.
         */
        if (request->packet->id >= 0) {
                paused = true;
                goto pause;
        }
 
        if (send_one_packet(client, request) < 0) {
                fr_perror("radclient");
                fr_exit_now(EXIT_FAILURE);
        }
 
        request->resend++;
        current = request;
 
        /*
         *      0 means "don't limit requests".
         */
        if (parallel && (fr_radius_client_bio_outstanding(client) >= parallel)) {
                paused = true;
                goto pause;
        }
}
 
static void  client_bio_connected(fr_bio_packet_t *client)
{
        fr_radius_client_bio_info_t const *info;
 
        info = fr_radius_client_bio_info(client);
 
        if (fr_event_fd_insert(autofree, NULL, info->retry_info->el, info->fd_info->socket.fd,
                               client_read, client_write, client_error, client) < 0) {
                fr_perror("radclient");
                fr_exit_now(EXIT_FAILURE);
        }
}
 
 
/**
 *
 * @hidecallgraph
 */
int main(int argc, char **argv)
{
        int             ret = EXIT_SUCCESS;
        int             c;
        char            const *raddb_dir = RADDBDIR;
        char            const *dict_dir = DICTDIR;
        char            *end;
        char            filesecret[256];
        FILE            *fp;
        int             do_summary = false;
        fr_dlist_head_t filenames;
 
        int             retries = 5;
        fr_time_delta_t timeout = fr_time_delta_from_sec(2);
 
        /*
         *      It's easier having two sets of flags to set the
         *      verbosity of library calls and the verbosity of
         *      radclient.
         */
        fr_debug_lvl = 0;
        fr_log_fp = stdout;
 
        /*
         *      Must be called first, so the handler is called last
         */
        fr_atexit_global_setup();
 
        fr_time_start();
 
        autofree = talloc_autofree_context();
#ifndef NDEBUG
        if (fr_fault_setup(autofree, getenv("PANIC_ACTION"), argv[0]) < 0) {
                fr_perror("radclient");
                fr_exit_now(EXIT_FAILURE);
        }
#endif
 
#ifdef STATIC_ANALYZER
        /*
         *      clang scan thinks that fr_fault_setup() will set autofree=NULL.
         */
        if (!autofree) fr_exit_now(EXIT_FAILURE);
#endif
 
        talloc_set_log_stderr();
 
        fr_dlist_talloc_init(&rc_request_list, rc_request_t, entry);
 
        fr_dlist_talloc_init(&filenames, rc_file_pair_t, entry);
 
        /*
         *      Always log to stdout
         */
        default_log.dst = L_DST_STDOUT;
        default_log.fd = STDOUT_FILENO;
        default_log.print_level = false;
 
        /*
         *      Initialize the kind of socket we want.
         */
        fd_config = (fr_bio_fd_config_t) {
                .type = FR_BIO_FD_CONNECTED,
                .socket_type = SOCK_DGRAM,
 
                .src_ipaddr = (fr_ipaddr_t) {
                        .af = AF_INET,
                },
                .dst_ipaddr = (fr_ipaddr_t) {
                        .af = AF_INET,
                },
 
                .src_port = 0,
                .dst_port = 1812,
 
                .interface = NULL,
 
                .path = NULL,
                .filename = NULL,
 
                .async = true,
        };
 
        /*
         *      Initialize the client configuration.
         */
        client_config = (fr_radius_client_config_t) {
                .log = &default_log,
                .verify = {
                        .require_message_authenticator = false,
                        .max_attributes = RADIUS_MAX_ATTRIBUTES,
                        .max_packet_size = 4096,
                },
        };
 
        /***********************************************************************
         *
         *      Parse command-line options.
         *
         ***********************************************************************/
 
        while ((c = getopt(argc, argv, "46A:c:C:d:D:f:Fi:ho:p:P:r:sS:t:vx")) != -1) switch (c) {
                case '4':
                        fd_config.dst_ipaddr.af = AF_INET;
                        break;
 
                case '6':
                        fd_config.dst_ipaddr.af = AF_INET6;
                        break;
 
                case 'A':
                        attr_coa_filter_name = optarg;
                        break;
 
                case 'c':
                        if (!isdigit((uint8_t) *optarg)) usage();
 
                        resend_count = atoi(optarg);
 
                        if (resend_count < 1) usage();
                        break;
 
                case 'C':
                {
                        int tmp;
 
                        if (strchr(optarg, ':')) {
                                if (fr_inet_pton_port(&fd_config.src_ipaddr, &fd_config.src_port,
                                                      optarg, -1, AF_UNSPEC, true, false) < 0) {
                                        fr_perror("Failed parsing source address");
                                        fr_exit_now(EXIT_FAILURE);
                                }
                                break;
                        }
 
                        tmp = atoi(optarg);
                        if (tmp < 1 || tmp > 65535) usage();
 
                        fd_config.src_port = (uint16_t)tmp;
                }
                        break;
 
                case 'D':
                        dict_dir = optarg;
                        break;
 
                case 'd':
                        raddb_dir = optarg;
                        break;
 
                        /*
                         *      packet,filter
                         */
                case 'f':
                {
                        char const *p;
                        rc_file_pair_t *files;
 
                        MEM(files = talloc_zero(talloc_autofree_context(), rc_file_pair_t));
 
                        /*
                         *      Commas are nicer than colons.
                         */
                        c = ':';
 
                        p = strchr(optarg, c);
                        if (!p) {
                                c = ',';
                                p = strchr(optarg, c);
                        }
                        if (!p) {
                                files->packets = optarg;
                                files->filters = NULL;
                        } else {
                                MEM(files->packets = talloc_strndup(files, optarg, p - optarg));
                                files->filters = p + 1;
                        }
                        fr_dlist_insert_tail(&filenames, files);
                }
                        break;
 
                case 'F':
                        print_filename = true;
                        break;
 
                case 'i':
                        if (!isdigit((uint8_t) *optarg))
                                usage();
                        forced_id = atoi(optarg);
                        if ((forced_id < 0) || (forced_id > 255)) {
                                usage();
                        }
                        break;
 
                case 'o':
                        coa_port = atoi(optarg);
                        if (!coa_port || (coa_port > 65535)) usage();
                        break;
 
                        /*
                         *      Note that sending MANY requests in
                         *      parallel can over-run the kernel
                         *      queues, and Linux will happily discard
                         *      packets.  So even if the server responds,
                         *      the client may not see the reply.
                         */
                case 'p':
                        parallel = strtoul(optarg, &end, 10);
                        if (*end) usage();
                        if (parallel > 65536) usage();
                        break;
 
                case 'P':
                        if (!strcmp(optarg, "tcp")) {
                                fd_config.socket_type = SOCK_STREAM;
                                ipproto = IPPROTO_TCP;
                        } else if (!strcmp(optarg, "udp")) {
                                fd_config.socket_type = SOCK_DGRAM;
                                ipproto = IPPROTO_UDP;
                        } else {
                                usage();
                        }
                        break;
 
                case 'r':
                        if (!isdigit((uint8_t) *optarg)) usage();
                        retries = atoi(optarg);
                        if ((retries == 0) || (retries > 1000)) usage();
                        break;
 
                case 's':
                        do_summary = true;
                        break;
 
                case 'S':
                {
                        char *p;
                        fp = fopen(optarg, "r");
                        if (!fp) {
                               ERROR("Error opening %s: %s", optarg, fr_syserror(errno));
                               fr_exit_now(EXIT_FAILURE);
                        }
                        if (fgets(filesecret, sizeof(filesecret), fp) == NULL) {
                               ERROR("Error reading %s: %s", optarg, fr_syserror(errno));
                               fr_exit_now(EXIT_FAILURE);
                        }
                        fclose(fp);
 
                        /* truncate newline */
                        p = filesecret + strlen(filesecret) - 1;
                        while ((p >= filesecret) &&
                              (*p < ' ')) {
                               *p = '\0';
                               --p;
                        }
 
                        if (strlen(filesecret) < 2) {
                               ERROR("Secret in %s is too short", optarg);
                               fr_exit_now(EXIT_FAILURE);
                        }
                        secret = talloc_strdup(autofree, filesecret);
                        client_config.verify.secret = (uint8_t *) secret;
                        client_config.verify.secret_len = talloc_array_length(secret) - 1;
                }
                       break;
 
                case 't':
                        if (fr_time_delta_from_str(&timeout, optarg, strlen(optarg), FR_TIME_RES_SEC) < 0) {
                                fr_perror("Failed parsing timeout value");
                                fr_exit_now(EXIT_FAILURE);
                        }
                        break;
 
                case 'v':
                        fr_debug_lvl = 1;
                        DEBUG("%s", radclient_version);
                        fr_exit_now(0);
 
                case 'x':
                        fr_debug_lvl++;
                        if (fr_debug_lvl > 1) default_log.print_level = true;
                        break;
 
                case 'h':
                default:
                        usage();
        }
        argc -= (optind - 1);
        argv += (optind - 1);
 
        if ((argc < 3) || ((secret == NULL) && (argc < 4))) {
                ERROR("Insufficient arguments");
                usage();
        }
 
        /*
         *      Get the request type
         */
        if (!isdigit((uint8_t) argv[2][0])) {
                packet_code = fr_table_value_by_str(fr_radius_request_name_table, argv[2], -2);
                if (packet_code == -2) {
                        ERROR("Unrecognised request type \"%s\"", argv[2]);
                        usage();
                }
        } else {
                packet_code = atoi(argv[2]);
        }
 
        fr_assert(packet_code != 0);
        fr_assert(packet_code < FR_RADIUS_CODE_MAX);
 
        /*
         *      Initialize the retry configuration for this type of packet.
         */
        client_config.outgoing[packet_code] = true;
        (void) fr_radius_allow_reply(packet_code, client_config.verify.allowed);
 
        client_config.retry[packet_code] = (fr_retry_config_t) {
                .irt = timeout,
                .mrt = fr_time_delta_from_sec(16),
                .mrd = (retries == 1) ? timeout : fr_time_delta_from_sec(30),
                .mrc = retries,
        };
        client_config.retry_cfg.retry_config = client_config.retry[packet_code];
 
        /*
         *      Resolve hostname.
         */
        if (strcmp(argv[1], "-") != 0) {
                if (fr_inet_pton_port(&fd_config.dst_ipaddr, &fd_config.dst_port, argv[1], -1, fd_config.dst_ipaddr.af, true, true) < 0) {
                        fr_perror("radclient");
                        fr_exit_now(EXIT_FAILURE);
                }
 
                /*
                 *      Work backwards from the port to determine the packet type
                 */
                if (packet_code == FR_RADIUS_CODE_UNDEFINED) packet_code = radclient_get_code(fd_config.dst_port);
        }
        radclient_get_port(packet_code, &fd_config.dst_port);
 
        /*
         *      Add the secret.
         */
        if (argv[3]) {
                secret = talloc_strdup(autofree, argv[3]);
                client_config.verify.secret = (uint8_t *) secret;
                client_config.verify.secret_len = talloc_array_length(secret) - 1;
        }
 
        /***********************************************************************
         *
         *      We're done parsing command-line options, bootstrap the various libraries, etc.
         *
         ***********************************************************************/
 
        if (fr_check_lib_magic(RADIUSD_MAGIC_NUMBER) < 0) {
                fr_perror("radclient");
                fr_exit_now(EXIT_FAILURE);
        }
 
        if (!fr_dict_global_ctx_init(NULL, true, dict_dir)) {
                fr_perror("radclient");
                fr_exit_now(EXIT_FAILURE);
        }
 
        if (fr_radius_global_init() < 0) {
                fr_perror("radclient");
                fr_exit_now(EXIT_FAILURE);
        }
 
        if (fr_dict_autoload(radclient_dict) < 0) {
                fr_perror("radclient");
                exit(EXIT_FAILURE);
        }
 
        if (fr_dict_attr_autoload(radclient_dict_attr) < 0) {
                fr_perror("radclient");
                exit(EXIT_FAILURE);
        }
 
        if (fr_dict_read(fr_dict_unconst(dict_freeradius), raddb_dir, FR_DICTIONARY_FILE) == -1) {
                fr_log_perror(&default_log, L_ERR, __FILE__, __LINE__, NULL,
                              "Failed to initialize the dictionaries");
                exit(EXIT_FAILURE);
        }
 
        if (do_coa) {
                attr_coa_filter = fr_dict_attr_by_name(NULL, fr_dict_root(dict_radius), attr_coa_filter_name);
                if (!attr_coa_filter) {
                        ERROR("Unknown or invalid CoA filter attribute %s", optarg);
                        fr_exit_now(EXIT_FAILURE);
                }
 
                /*
                 *      If there's no attribute given to match CoA to requests, use User-Name
                 */
                if (!attr_coa_filter) attr_coa_filter = attr_user_name;
 
                MEM(coa_tree = fr_rb_talloc_alloc(autofree, rc_request_t, request_cmp, NULL));
        }
        packet_global_init();
 
        openssl3_init();
 
        fr_strerror_clear();
 
        /***********************************************************************
         *
         *      We're done bootstrapping the libraries and dictionaries, read the input files.
         *
         ***********************************************************************/
 
        /*
         *      If no '-f' is specified, then we are reading from stdin.
         */
        if (fr_dlist_num_elements(&filenames) == 0) {
                rc_file_pair_t *files;
 
                files = talloc_zero(talloc_autofree_context(), rc_file_pair_t);
                files->packets = "-";
                if (radclient_init(files, files) < 0) fr_exit_now(EXIT_FAILURE);
        }
 
        if ((forced_id >= 0) && (fr_dlist_num_elements(&filenames) > 1)) {
                usage();
        }
 
        /*
         *      Walk over the list of filenames, creating the requests.
         */
        fr_dlist_foreach(&filenames, rc_file_pair_t, files) {
                if (radclient_init(files, files)) {
                        ERROR("Failed parsing input files");
                        fr_exit_now(EXIT_FAILURE);
                }
        }
 
        /*
         *      No packets were read.  Die.
         */
        if (!fr_dlist_num_elements(&rc_request_list)) {
                ERROR("Nothing to send");
                fr_exit_now(EXIT_FAILURE);
        }
 
        /***********************************************************************
         *
         *      We're done reading files, open the socket, event loop, and start sending packets.
         *
         ***********************************************************************/
 
        client_config.el = fr_event_list_alloc(autofree,
                                               (fr_debug_lvl >= 2) ? _loop_status : NULL,
                                               NULL);
        if (!client_config.el) {
                ERROR("Failed opening event list: %s", fr_strerror());
                fr_exit_now(EXIT_FAILURE);
        }
        client_config.retry_cfg.el = client_config.el;
 
        /*
         *      Set callbacks so that the socket is automatically
         *      paused or resumed when the socket becomes writeable.
         */
        client_config.packet_cb_cfg = (fr_bio_packet_cb_funcs_t) {
                .connected      = client_bio_connected,
                .failed         = client_bio_failed,
 
                .write_blocked  = client_bio_write_pause,
                .write_resume   = client_bio_write_resume,
 
                .retry          = (fr_debug_lvl > 0) ? client_packet_retry_log : NULL,
                .release        = client_packet_release,
        };
 
#ifdef STATIC_ANALYZER
        if (!autofree) fr_exit_now(EXIT_FAILURE);
#endif
 
        /*
         *      Open the RADIUS client bio, and then get the information associated with it.
         */
        client_bio = fr_radius_client_bio_alloc(autofree, &client_config, &fd_config);
        if (!client_bio) {
                ERROR("Failed opening socket: %s", fr_strerror());
                fr_exit_now(EXIT_FAILURE);
        }
 
        client_info = fr_radius_client_bio_info(client_bio);
        fr_assert(client_info != NULL);
 
        if (forced_id >= 0) {
                if (fr_radius_client_bio_force_id(client_bio, packet_code, forced_id) < 0) {
                        fr_perror("radclient");
                        fr_exit_now(EXIT_FAILURE);
                }
        }
 
        if (do_coa) {
                // allocate a dedup server bio
        }
 
        /*
         *      Walk over the list of packets, updating to use the correct addresses, and sanity checking them.
         */
        fr_dlist_foreach(&rc_request_list, rc_request_t, this) {
                if (radclient_sane(this) < 0) {
                        fr_exit_now(EXIT_FAILURE);
                }
        }
 
        /*
         *      Always bounce through a connect(), even if we don't need it.
         *
         *      Once the connect() passes, we start reading from the request list, and processing packets.
         */
        if (fr_event_fd_insert(autofree, NULL, client_config.retry_cfg.el, client_info->fd_info->socket.fd, NULL,
                               fr_radius_client_bio_connect, client_error, client_bio) < 0) {
                fr_perror("radclient");
                fr_exit_now(EXIT_FAILURE);
        }
 
        /***********************************************************************
         *
         *      Run the main event loop until we either see an error, or we have sent (and received) all of the packets.
         *
         ***********************************************************************/
        (void) fr_event_loop(client_config.retry_cfg.el);
 
        /***********************************************************************
         *
         *      We are done the event loop.  Start cleaning things up.
         *
         ***********************************************************************/
        fr_dlist_talloc_free(&rc_request_list);
 
        (void) fr_event_fd_delete(client_config.retry_cfg.el, client_info->fd_info->socket.fd, FR_EVENT_FILTER_IO);
 
        fr_radius_global_free();
 
        if (fr_dict_autofree(radclient_dict) < 0) {
                fr_perror("radclient");
                ret = EXIT_FAILURE;
        }
 
        talloc_free(autofree);
 
        fr_strerror_clear();
 
        if (do_summary) {
                fr_perror("Packet summary:\n"
                      "\tAccepted      : %" PRIu64 "\n"
                      "\tRejected      : %" PRIu64 "\n"
                      "\tLost          : %" PRIu64 "\n"
                      "\tPassed filter : %" PRIu64 "\n"
                      "\tFailed filter : %" PRIu64,
                      stats.accepted,
                      stats.rejected,
                      stats.lost,
                      stats.passed,
                      stats.failed
                );
        }
 
        /*
         *      Ensure our atexit handlers run before any other
         *      atexit handlers registered by third party libraries.
         */
        fr_atexit_global_trigger_all();
 
        openssl3_free();
 
        if ((stats.lost > 0) || (stats.failed > 0)) return EXIT_FAILURE;
 
        return ret;
}