/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
 * Junior University
 * 
 * We are making the OpenFlow specification and associated documentation
 * (Software) available for public use and benefit with the expectation
 * that others will use, modify and enhance the Software and contribute
 * those enhancements back to the community. However, since we would
 * like to make the Software available for broadest use, with as few
 * restrictions as possible permission is hereby granted, free of
 * charge, to any person obtaining a copy of this Software to deal in
 * the Software under the copyrights without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 * The name and trademarks of copyright holder(s) may NOT be used in
 * advertising or publicity pertaining to the Software or any
 * derivatives without specific, written prior permission.
 */

#include <config.h>
#include <errno.h>
#include <getopt.h>
#include <inttypes.h>
#include <netinet/in.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/time.h>

#include "command-line.h"
#include "compiler.h"
#include "buffer.h"
#include "dpif.h"
#ifdef HAVE_NETLINK
#include "netlink.h"
#include "openflow-netlink.h"
#endif
#include "util.h"
#include "socket-util.h"
#include "openflow.h"
#include "ofp-print.h"
#include "random.h"
#include "signal.h"
#include "vconn.h"
#include "vconn-ssl.h"

#include "vlog.h"
#define THIS_MODULE VLM_dpctl

#define DEFAULT_MAX_IDLE 60
#define MAX_ADD_ACTS 5

static const char* ifconfigbin = "/sbin/ifconfig";

struct command {
    const char *name;
    int min_args;
    int max_args;
    void (*handler)(int argc, char *argv[]);
};

static struct command all_commands[];

static void usage(void) NO_RETURN;
static void parse_options(int argc, char *argv[]);

int main(int argc, char *argv[])
{
    struct command *p;

    set_program_name(argv[0]);
    vlog_init();
    parse_options(argc, argv);

    argc -= optind;
    argv += optind;
    if (argc < 1)
        fatal(0, "missing command name; use --help for help");

    for (p = all_commands; p->name != NULL; p++) {
        if (!strcmp(p->name, argv[0])) {
            int n_arg = argc - 1;
            if (n_arg < p->min_args)
                fatal(0, "'%s' command requires at least %d arguments",
                      p->name, p->min_args);
            else if (n_arg > p->max_args)
                fatal(0, "'%s' command takes at most %d arguments",
                      p->name, p->max_args);
            else {
                p->handler(argc, argv);
                exit(0);
            }
        }
    }
    fatal(0, "unknown command '%s'; use --help for help", argv[0]);

    return 0;
}

static void
parse_options(int argc, char *argv[])
{
    static struct option long_options[] = {
        {"timeout", required_argument, 0, 't'},
        {"verbose", optional_argument, 0, 'v'},
        {"help", no_argument, 0, 'h'},
        {"version", no_argument, 0, 'V'},
        VCONN_SSL_LONG_OPTIONS
        {0, 0, 0, 0},
    };
    char *short_options = long_options_to_short_options(long_options);

    for (;;) {
        unsigned long int timeout;
        int c;

        c = getopt_long(argc, argv, short_options, long_options, NULL);
        if (c == -1) {
            break;
        }

        switch (c) {
        case 't':
            timeout = strtoul(optarg, NULL, 10);
            if (timeout <= 0) {
                fatal(0, "value %s on -t or --timeout is not at least 1",
                      optarg);
            } else if (timeout < UINT_MAX) {
                /* Add 1 because historical implementations allow an alarm to
                 * occur up to a second early. */
                alarm(timeout + 1);
            } else {
                alarm(UINT_MAX);
            }
            signal(SIGALRM, SIG_DFL);
            break;

        case 'h':
            usage();

        case 'V':
            printf("%s "VERSION" compiled "__DATE__" "__TIME__"\n", argv[0]);
            exit(EXIT_SUCCESS);

        case 'v':
            vlog_set_verbosity(optarg);
            break;

        VCONN_SSL_OPTION_HANDLERS

        case '?':
            exit(EXIT_FAILURE);

        default:
            abort();
        }
    }
    free(short_options);
}

static void
usage(void)
{
    printf("%s: OpenFlow switch management utility\n"
           "usage: %s [OPTIONS] COMMAND [ARG...]\n"
#ifdef HAVE_NETLINK
           "\nFor local datapaths only:\n"
           "  adddp nl:DP_ID              add a new local datapath DP_ID\n"
           "  deldp nl:DP_ID              delete local datapath DP_ID\n"
           "  addif nl:DP_ID IFACE        add IFACE as a port on DP_ID\n"
           "  delif nl:DP_ID IFACE        delete IFACE as a port on DP_ID\n"
           "  monitor nl:DP_ID            print packets received\n"
#endif
           "\nFor local datapaths and remote switches:\n"
           "  show SWITCH                 show information\n"
           "  dump-tables SWITCH          print table stats\n"
           "  dump-ports SWITCH           print port statistics\n"
           "  dump-flows SWITCH           print all flow entries\n"
           "  dump-flows SWITCH FLOW      print matching FLOWs\n"
           "  dump-aggregate SWITCH       print aggregate flow statistics\n"
           "  dump-aggregate SWITCH FLOW  print aggregate stats for FLOWs\n"
           "  add-flow SWITCH FLOW        add flow described by FLOW\n"
           "  add-flows SWITCH FILE       add flows from FILE\n"
           "  del-flows SWITCH FLOW       delete matching FLOWs\n"
           "\nFor local datapaths, remote switches, and controllers:\n"
           "  probe VCONN                 probe whether VCONN is up\n"
           "  ping VCONN [N]              latency of N-byte echos\n"
           "  benchmark VCONN N COUNT     bandwidth of COUNT N-byte echos\n"
           "where each SWITCH is an active OpenFlow connection method.\n",
           program_name, program_name);
    vconn_usage(true, false);
    printf("\nOptions:\n"
           "  -t, --timeout=SECS          give up after SECS seconds\n"
           "  -v, --verbose=MODULE[:FACILITY[:LEVEL]]  set logging levels\n"
           "  -v, --verbose               set maximum verbosity level\n"
           "  -h, --help                  display this help message\n"
           "  -V, --version               display version information\n");
    exit(EXIT_SUCCESS);
}

static void run(int retval, const char *message, ...)
    PRINTF_FORMAT(2, 3);

static void run(int retval, const char *message, ...)
{
    if (retval) {
        va_list args;

        fprintf(stderr, "%s: ", program_name);
        va_start(args, message);
        vfprintf(stderr, message, args);
        va_end(args);
        if (retval == EOF) {
            fputs(": unexpected end of file\n", stderr);
        } else {
            fprintf(stderr, ": %s\n", strerror(retval));
        }

        exit(EXIT_FAILURE);
    }
}

#ifdef HAVE_NETLINK
/* Netlink-only commands. */

static int  if_up(const char* intf)
{
    char command[256];
    snprintf(command, sizeof command, "%s %s up &> /dev/null",
            ifconfigbin, intf);
    return system(command);
}

static void open_nl_vconn(const char *name, bool subscribe, struct dpif *dpif)
{
    if (strncmp(name, "nl:", 3)
        || strlen(name) < 4
        || name[strspn(name + 3, "0123456789") + 3]) {
        fatal(0, "%s: argument is not of the form \"nl:DP_ID\"", name);
    }
    run(dpif_open(atoi(name + 3), subscribe, dpif), "opening datapath");
}

static void do_add_dp(int argc UNUSED, char *argv[])
{
    struct dpif dp;
    open_nl_vconn(argv[1], false, &dp);
    run(dpif_add_dp(&dp), "add_dp");
    dpif_close(&dp);
}

static void do_del_dp(int argc UNUSED, char *argv[])
{
    struct dpif dp;
    open_nl_vconn(argv[1], false, &dp);
    run(dpif_del_dp(&dp), "del_dp");
    dpif_close(&dp);
}

static void do_add_port(int argc UNUSED, char *argv[])
{
    struct dpif dp;
    if_up(argv[2]);
    open_nl_vconn(argv[1], false, &dp);
    run(dpif_add_port(&dp, argv[2]), "add_port");
    dpif_close(&dp);
}

static void do_del_port(int argc UNUSED, char *argv[])
{
    struct dpif dp;
    open_nl_vconn(argv[1], false, &dp);
    run(dpif_del_port(&dp, argv[2]), "del_port");
    dpif_close(&dp);
}

static void do_monitor(int argc UNUSED, char *argv[])
{
    struct dpif dp;
    open_nl_vconn(argv[1], true, &dp);
    for (;;) {
        struct buffer *b;
        run(dpif_recv_openflow(&dp, &b, true), "dpif_recv_openflow");
        ofp_print(stderr, b->data, b->size, 2);
        buffer_delete(b);
    }
}
#endif /* HAVE_NETLINK */

/* Generic commands. */

static void *
alloc_stats_request(size_t body_len, uint16_t type, struct buffer **bufferp)
{
    struct ofp_stats_request *rq;
    rq = make_openflow((offsetof(struct ofp_stats_request, body)
                        + body_len), OFPT_STATS_REQUEST, bufferp);
    rq->type = htons(type);
    rq->flags = htons(0);
    return rq->body;
}

static void
send_openflow_buffer(struct vconn *vconn, struct buffer *buffer)
{
    update_openflow_length(buffer);
    run(vconn_send_block(vconn, buffer), "failed to send packet to switch");
}

static void
dump_transaction(const char *vconn_name, struct buffer *request)
{
    struct vconn *vconn;
    struct buffer *reply;

    update_openflow_length(request);
    run(vconn_open_block(vconn_name, &vconn), "connecting to %s", vconn_name);
    run(vconn_transact(vconn, request, &reply), "talking to %s", vconn_name);
    ofp_print(stdout, reply->data, reply->size, 1);
    vconn_close(vconn);
}

static void
dump_trivial_transaction(const char *vconn_name, uint8_t request_type)
{
    struct buffer *request;
    make_openflow(sizeof(struct ofp_header), request_type, &request);
    dump_transaction(vconn_name, request);
}

static void
dump_stats_transaction(const char *vconn_name, struct buffer *request)
{
    uint32_t send_xid = ((struct ofp_header *) request->data)->xid;
    struct vconn *vconn;
    bool done = false;

    run(vconn_open_block(vconn_name, &vconn), "connecting to %s", vconn_name);
    send_openflow_buffer(vconn, request);
    while (!done) {
        uint32_t recv_xid;
        struct buffer *reply;

        run(vconn_recv_block(vconn, &reply), "OpenFlow packet receive failed");
        recv_xid = ((struct ofp_header *) reply->data)->xid;
        if (send_xid == recv_xid) {
            struct ofp_stats_reply *osr;

            ofp_print(stdout, reply->data, reply->size, 1);

            osr = buffer_at(reply, 0, sizeof *osr);
            done = !osr || !(ntohs(osr->flags) & OFPSF_REPLY_MORE);
        } else {
            VLOG_DBG("received reply with xid %08"PRIx32" "
                     "!= expected %08"PRIx32, recv_xid, send_xid);
        }
        buffer_delete(reply);
    }
    vconn_close(vconn);
}

static void
dump_trivial_stats_transaction(const char *vconn_name, uint8_t stats_type)
{
    struct buffer *request;
    alloc_stats_request(0, stats_type, &request);
    dump_stats_transaction(vconn_name, request);
}

static void
do_show(int argc UNUSED, char *argv[])
{
    dump_trivial_transaction(argv[1], OFPT_FEATURES_REQUEST);
    dump_trivial_transaction(argv[1], OFPT_GET_CONFIG_REQUEST);
}


static void
do_dump_tables(int argc, char *argv[])
{
    dump_trivial_stats_transaction(argv[1], OFPST_TABLE);
}


static uint32_t
str_to_int(const char *str) 
{
    uint32_t value;
    if (sscanf(str, "%"SCNu32, &value) != 1) {
        fatal(0, "invalid numeric format %s", str);
    }
    return value;
}

static void
str_to_mac(const char *str, uint8_t mac[6]) 
{
    if (sscanf(str, "%"SCNx8":%"SCNx8":%"SCNx8":%"SCNx8":%"SCNx8":%"SCNx8,
               &mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5]) != 6) {
        fatal(0, "invalid mac address %s", str);
    }
}

static void
str_to_ip(const char *str, uint32_t *ip) 
{
    struct in_addr in_addr;
    int retval;

    retval = lookup_ip(str, &in_addr);
    if (retval) {
        fatal(0, "%s: could not convert to IP address", str);
    }
    *ip = in_addr.s_addr;
}

static void
str_to_action(char *str, struct ofp_action *action, int *n_actions) 
{
    uint16_t port;
    int i;
    int max_actions = *n_actions;
    char *act, *arg;
    char *saveptr = NULL;
    
    memset(action, 0, sizeof(*action) * max_actions);
    for (i=0, act = strtok_r(str, ", \t\r\n", &saveptr); 
         i<max_actions && act;
         i++, act = strtok_r(NULL, ", \t\r\n", &saveptr)) 
    {
        port = OFPP_MAX;

        /* Arguments are separated by colons */
        arg = strchr(act, ':');
        if (arg) {
            *arg = '\0';
            arg++;
        } 

        if (!strcasecmp(act, "mod_vlan")) {
            action[i].type = htons(OFPAT_SET_DL_VLAN);

            if (!strcasecmp(arg, "strip")) {
                action[i].arg.vlan_id = htons(OFP_VLAN_NONE);
            } else {
                action[i].arg.vlan_id = htons(str_to_int(arg));
            }
        } else if (!strcasecmp(act, "output")) {
            port = str_to_int(arg);
        } else if (!strcasecmp(act, "TABLE")) {
            port = OFPP_TABLE;
        } else if (!strcasecmp(act, "NORMAL")) {
            port = OFPP_NORMAL;
        } else if (!strcasecmp(act, "FLOOD")) {
            port = OFPP_FLOOD;
        } else if (!strcasecmp(act, "ALL")) {
            port = OFPP_ALL;
        } else if (!strcasecmp(act, "CONTROLLER")) {
            port = OFPP_CONTROLLER;
            if (arg) {
                if (!strcasecmp(arg, "all")) {
                    action[i].arg.output.max_len= htons(0);
                } else {
                    action[i].arg.output.max_len= htons(str_to_int(arg));
                }
            }
        } else if (!strcasecmp(act, "LOCAL")) {
            port = OFPP_LOCAL;
        } else if (strspn(act, "0123456789") == strlen(act)) {
            port = str_to_int(act);
        } else {
            fatal(0, "Unknown action: %s", act);
        }

        if (port != OFPP_MAX) {
            action[i].type = htons(OFPAT_OUTPUT);
            action[i].arg.output.port = htons(port);
        }
    }

    *n_actions = i;
}

static void
str_to_flow(char *string, struct ofp_match *match, 
        struct ofp_action *action, int *n_actions, uint8_t *table_idx, 
        uint16_t *priority, uint16_t *max_idle)
{
    struct field {
        const char *name;
        uint32_t wildcard;
        enum { F_U8, F_U16, F_MAC, F_IP } type;
        size_t offset;
    };

#define F_OFS(MEMBER) offsetof(struct ofp_match, MEMBER)
    static const struct field fields[] = { 
        { "in_port", OFPFW_IN_PORT, F_U16, F_OFS(in_port) },
        { "dl_vlan", OFPFW_DL_VLAN, F_U16, F_OFS(dl_vlan) },
        { "dl_src", OFPFW_DL_SRC, F_MAC, F_OFS(dl_src) },
        { "dl_dst", OFPFW_DL_DST, F_MAC, F_OFS(dl_dst) },
        { "dl_type", OFPFW_DL_TYPE, F_U16, F_OFS(dl_type) },
        { "nw_src", OFPFW_NW_SRC, F_IP, F_OFS(nw_src) },
        { "nw_dst", OFPFW_NW_DST, F_IP, F_OFS(nw_dst) },
        { "nw_proto", OFPFW_NW_PROTO, F_U8, F_OFS(nw_proto) },
        { "tp_src", OFPFW_TP_SRC, F_U16, F_OFS(tp_src) },
        { "tp_dst", OFPFW_TP_DST, F_U16, F_OFS(tp_dst) },
    };

    char *name, *value;
    uint32_t wildcards;
    char *act_str;

    if (table_idx) {
        *table_idx = 0xff;
    }
    if (priority) {
        *priority = OFP_DEFAULT_PRIORITY;
    }
    if (max_idle) {
        *max_idle = DEFAULT_MAX_IDLE;
    }
    if (action) {
        act_str = strstr(string, "action");
        if (!act_str) {
            fatal(0, "must specify an action");
        }
        *(act_str-1) = '\0';

        act_str = strchr(act_str, '=');
        if (!act_str) {
            fatal(0, "must specify an action");
        }

        act_str++;

        str_to_action(act_str, action, n_actions);
    }
    memset(match, 0, sizeof *match);
    wildcards = OFPFW_ALL;
    for (name = strtok(string, "="), value = strtok(NULL, ", \t\r\n");
         name && value;
         name = strtok(NULL, "="), value = strtok(NULL, ", \t\r\n"))
    {
        const struct field *f;
        void *data;

        if (table_idx && !strcmp(name, "table")) {
            *table_idx = atoi(value);
            continue;
        }

        if (priority && !strcmp(name, "priority")) {
            *priority = atoi(value);
            continue;
        }

        if (max_idle && !strcmp(name, "max_idle")) {
            *max_idle = atoi(value);
            continue;
        }

        for (f = fields; f < &fields[ARRAY_SIZE(fields)]; f++) {
            if (!strcmp(f->name, name)) {
                goto found;
            }
        }
        fprintf(stderr, "%s: unknown field %s (fields are",
                program_name, name);
        for (f = fields; f < &fields[ARRAY_SIZE(fields)]; f++) {
            if (f != fields) {
                putc(',', stderr);
            }
            fprintf(stderr, " %s", f->name);
        }
        fprintf(stderr, ")\n");
        exit(1);

    found:
        data = (char *) match + f->offset;
        if (!strcmp(value, "*") || !strcmp(value, "ANY")) {
            wildcards |= f->wildcard;
        } else {
            wildcards &= ~f->wildcard;
            if (f->type == F_U8) {
                *(uint8_t *) data = str_to_int(value);
            } else if (f->type == F_U16) {
                *(uint16_t *) data = htons(str_to_int(value));
            } else if (f->type == F_MAC) {
                str_to_mac(value, data);
            } else if (f->type == F_IP) {
                str_to_ip(value, data);
            } else {
                NOT_REACHED();
            }
        }
    }
    if (name && !value) {
        fatal(0, "field %s missing value", name);
    }
    match->wildcards = htons(wildcards);
}

static void do_dump_flows(int argc, char *argv[])
{
    struct ofp_flow_stats_request *req;
    struct buffer *request;

    req = alloc_stats_request(sizeof *req, OFPST_FLOW, &request);
    str_to_flow(argc > 2 ? argv[2] : "", &req->match, NULL, 0, 
            &req->table_id, NULL, NULL);
    memset(req->pad, 0, sizeof req->pad);

    dump_stats_transaction(argv[1], request);
}

static void do_dump_aggregate(int argc, char *argv[])
{
    struct ofp_aggregate_stats_request *req;
    struct buffer *request;

    req = alloc_stats_request(sizeof *req, OFPST_AGGREGATE, &request);
    str_to_flow(argc > 2 ? argv[2] : "", &req->match, NULL, 0,
            &req->table_id, NULL, NULL);
    memset(req->pad, 0, sizeof req->pad);

    dump_stats_transaction(argv[1], request);
}

static void do_add_flow(int argc, char *argv[])
{
    struct vconn *vconn;
    struct buffer *buffer;
    struct ofp_flow_mod *ofm;
    uint16_t priority, max_idle;
    size_t size;
    int n_actions = MAX_ADD_ACTS;

    run(vconn_open_block(argv[1], &vconn), "connecting to %s", argv[1]);

    /* Parse and send. */
    size = sizeof *ofm + (sizeof ofm->actions[0] * MAX_ADD_ACTS);
    ofm = make_openflow(size, OFPT_FLOW_MOD, &buffer);
    str_to_flow(argv[2], &ofm->match, &ofm->actions[0], &n_actions, 
            NULL, &priority, &max_idle);
    ofm->command = htons(OFPFC_ADD);
    ofm->max_idle = htons(max_idle);
    ofm->buffer_id = htonl(UINT32_MAX);
    ofm->priority = htons(priority);
    ofm->reserved = htonl(0);

    /* xxx Should we use the buffer library? */
    buffer->size -= (MAX_ADD_ACTS - n_actions) * sizeof ofm->actions[0];

    send_openflow_buffer(vconn, buffer);
    vconn_close(vconn);
}

static void do_add_flows(int argc, char *argv[])
{
    struct vconn *vconn;

    FILE *file;
    char line[1024];

    file = fopen(argv[2], "r");
    if (file == NULL) {
        fatal(errno, "%s: open", argv[2]);
    }

    run(vconn_open_block(argv[1], &vconn), "connecting to %s", argv[1]);
    while (fgets(line, sizeof line, file)) {
        struct buffer *buffer;
        struct ofp_flow_mod *ofm;
        uint16_t priority, max_idle;
        size_t size;
        int n_actions = MAX_ADD_ACTS;

        char *comment;

        /* Delete comments. */
        comment = strchr(line, '#');
        if (comment) {
            *comment = '\0';
        }

        /* Drop empty lines. */
        if (line[strspn(line, " \t\n")] == '\0') {
            continue;
        }

        /* Parse and send. */
        size = sizeof *ofm + (sizeof ofm->actions[0] * MAX_ADD_ACTS);
        ofm = make_openflow(size, OFPT_FLOW_MOD, &buffer);
        str_to_flow(line, &ofm->match, &ofm->actions[0], &n_actions, 
                    NULL, &priority, &max_idle);
        ofm->command = htons(OFPFC_ADD);
        ofm->max_idle = htons(max_idle);
        ofm->buffer_id = htonl(UINT32_MAX);
        ofm->priority = htons(priority);
        ofm->reserved = htonl(0);

        /* xxx Should we use the buffer library? */
        buffer->size -= (MAX_ADD_ACTS - n_actions) * sizeof ofm->actions[0];

        send_openflow_buffer(vconn, buffer);
    }
    vconn_close(vconn);
    fclose(file);
}

static void do_del_flows(int argc, char *argv[])
{
    struct vconn *vconn;
    uint16_t priority;

    run(vconn_open_block(argv[1], &vconn), "connecting to %s", argv[1]);
    struct buffer *buffer;
    struct ofp_flow_mod *ofm;
    size_t size;


    /* Parse and send. */
    size = sizeof *ofm;
    ofm = make_openflow(size, OFPT_FLOW_MOD, &buffer);
    str_to_flow(argc > 2 ? argv[2] : "", &ofm->match, NULL, 0, NULL, 
                &priority, NULL);
    ofm->command = htons(OFPFC_DELETE);
    ofm->max_idle = htons(0);
    ofm->buffer_id = htonl(UINT32_MAX);
    ofm->priority = htons(priority);
    ofm->reserved = htonl(0);

    send_openflow_buffer(vconn, buffer);

    vconn_close(vconn);
}

static void
do_dump_ports(int argc, char *argv[])
{
    dump_trivial_stats_transaction(argv[1], OFPST_PORT);
}

static void
do_probe(int argc, char *argv[])
{
    struct buffer *request;
    struct vconn *vconn;
    struct buffer *reply;

    make_openflow(sizeof(struct ofp_header), OFPT_ECHO_REQUEST, &request);
    run(vconn_open_block(argv[1], &vconn), "connecting to %s", argv[1]);
    run(vconn_transact(vconn, request, &reply), "talking to %s", argv[1]);
    if (reply->size != request->size) {
        fatal(0, "reply does not match request");
    }
    buffer_delete(reply);
    vconn_close(vconn);
}

static void
do_ping(int argc, char *argv[])
{
    size_t max_payload = 65535 - sizeof(struct ofp_header);
    unsigned int payload;
    struct vconn *vconn;
    int i;

    payload = argc > 2 ? atoi(argv[2]) : 64;
    if (payload > max_payload) {
        fatal(0, "payload must be between 0 and %zu bytes", max_payload);
    }

    run(vconn_open_block(argv[1], &vconn), "connecting to %s", argv[1]);
    for (i = 0; i < 10; i++) {
        struct timeval start, end;
        struct buffer *request, *reply;
        struct ofp_header *rq_hdr, *rpy_hdr;

        rq_hdr = make_openflow(sizeof(struct ofp_header) + payload,
                               OFPT_ECHO_REQUEST, &request);
        random_bytes(rq_hdr + 1, payload);

        gettimeofday(&start, NULL);
        run(vconn_transact(vconn, buffer_clone(request), &reply), "transact");
        gettimeofday(&end, NULL);

        rpy_hdr = reply->data;
        if (reply->size != request->size
            || memcmp(rpy_hdr + 1, rq_hdr + 1, payload)
            || rpy_hdr->xid != rq_hdr->xid
            || rpy_hdr->type != OFPT_ECHO_REPLY) {
            printf("Reply does not match request.  Request:\n");
            ofp_print(stdout, request, request->size, 2);
            printf("Reply:\n");
            ofp_print(stdout, reply, reply->size, 2);
        }
        printf("%d bytes from %s: xid=%08"PRIx32" time=%.1f ms\n",
               reply->size - sizeof *rpy_hdr, argv[1], rpy_hdr->xid,
                   (1000*(double)(end.tv_sec - start.tv_sec))
                   + (.001*(end.tv_usec - start.tv_usec)));
        buffer_delete(request);
        buffer_delete(reply);
    }
    vconn_close(vconn);
}

static void
do_benchmark(int argc, char *argv[])
{
    size_t max_payload = 65535 - sizeof(struct ofp_header);
    struct timeval start, end;
    unsigned int payload_size, message_size;
    struct vconn *vconn;
    double duration;
    int count;
    int i;

    payload_size = atoi(argv[2]);
    if (payload_size > max_payload) {
        fatal(0, "payload must be between 0 and %zu bytes", max_payload);
    }
    message_size = sizeof(struct ofp_header) + payload_size;

    count = atoi(argv[3]);

    printf("Sending %d packets * %u bytes (with header) = %u bytes total\n",
           count, message_size, count * message_size);

    run(vconn_open_block(argv[1], &vconn), "connecting to %s", argv[1]);
    gettimeofday(&start, NULL);
    for (i = 0; i < count; i++) {
        struct buffer *request, *reply;
        struct ofp_header *rq_hdr;

        rq_hdr = make_openflow(message_size, OFPT_ECHO_REQUEST, &request);
        memset(rq_hdr + 1, 0, payload_size);
        run(vconn_transact(vconn, request, &reply), "transact");
        buffer_delete(reply);
    }
    gettimeofday(&end, NULL);
    vconn_close(vconn);

    duration = ((1000*(double)(end.tv_sec - start.tv_sec))
                + (.001*(end.tv_usec - start.tv_usec)));
    printf("Finished in %.1f ms (%.0f packets/s) (%.0f bytes/s)\n",
           duration, count / (duration / 1000.0),
           count * message_size / (duration / 1000.0));
}

static void do_help(int argc UNUSED, char *argv[] UNUSED)
{
    usage();
}

static struct command all_commands[] = {
#ifdef HAVE_NETLINK
    { "adddp", 1, 1, do_add_dp },
    { "deldp", 1, 1, do_del_dp },
    { "addif", 2, 2, do_add_port },
    { "delif", 2, 2, do_del_port },
#endif

    { "show", 1, 1, do_show },

    { "help", 0, INT_MAX, do_help },
    { "monitor", 1, 1, do_monitor },
    { "dump-tables", 1, 1, do_dump_tables },
    { "dump-flows", 1, 2, do_dump_flows },
    { "dump-aggregate", 1, 2, do_dump_aggregate },
    { "add-flow", 2, 2, do_add_flow },
    { "add-flows", 2, 2, do_add_flows },
    { "del-flows", 1, 2, do_del_flows },
    { "dump-ports", 1, 1, do_dump_ports },
    { "probe", 1, 1, do_probe },
    { "ping", 1, 2, do_ping },
    { "benchmark", 3, 3, do_benchmark },
    { NULL, 0, 0, NULL },
};