Esempio n. 1
0
dtn_endpoint_id_t *
parse_eid(dtn_handle_t handle, dtn_endpoint_id_t* eid, char * str)
{
    // try the string as an actual dtn eid
    if (!dtn_parse_eid_string(eid, str)) {
        if (verbose)
		fprintf(info, "%s (literal)\n", str);
        return eid;
    } else if (!dtn_build_local_eid(handle, eid, str)) {
        // build a local eid based on the configuration of our dtn
        // router plus the str as demux string
        if (verbose) fprintf(info, "%s (local)\n", str);
        return eid;
    } else {
        fprintf(stderr, "invalid eid string '%s'\n", str);
        exit(EXIT_FAILURE);
    }
}
Esempio n. 2
0
dtn_endpoint_id_t * parse_eid(dtn_handle_t handle, 
                          dtn_endpoint_id_t * eid, char * str)
{
    
    // try the string as an actual dtn eid
    if (!dtn_parse_eid_string(eid, str)) 
    {
        return eid;
    }
    // build a local eid based on the configuration of our dtn
    // router plus the str as demux string
    else if (!dtn_build_local_eid(handle, eid, str))
    {
        return eid;
    }
    else
    {
        fprintf(stderr, "invalid endpoint id string '%s'\n", str);
        exit(1);
    }
}
Esempio n. 3
0
int
main(int argc, const char** argv)
{
    int i;
    int ret;
    dtn_handle_t handle;
    dtn_endpoint_id_t source_eid;
    dtn_reg_info_t reginfo;
    dtn_reg_id_t regid;
    dtn_bundle_spec_t ping_spec;
    dtn_bundle_spec_t reply_spec;
    dtn_bundle_payload_t ping_payload;
    ping_payload_t payload_contents;
    ping_payload_t recv_contents;
    dtn_bundle_payload_t reply_payload;
    dtn_bundle_status_report_t* sr_data;
    dtn_bundle_id_t bundle_id;
    int debug = 1;
    char demux[64];
    int dest_len = 0;
    struct timeval send_times[MAX_PINGS_IN_FLIGHT];
    dtn_timestamp_t creation_times[MAX_PINGS_IN_FLIGHT];
    struct timeval now, recv_start, recv_end;
    u_int32_t nonce;
    u_int32_t seqno = 0;
    int timeout;

    // force stdout to always be line buffered, even if output is
    // redirected to a pipe or file
    setvbuf(stdout, (char *)NULL, _IOLBF, 0);
    
    doOptions(argc, argv);

    memset(&ping_spec, 0, sizeof(ping_spec));

    gettimeofday(&now, 0);
    srand(now.tv_sec);
    nonce = rand();
    
    // open the ipc handle
    int err = dtn_open(&handle);
    if (err != DTN_SUCCESS) {
        fprintf(stderr, "fatal error opening dtn handle: %s\n",
                dtn_strerror(err));
        exit(1);
    }

    // make sure they supplied a valid destination eid or
    // "localhost", in which case we just use the local daemon
    if (strcmp(dest_eid_str, "localhost") == 0) {
        dtn_build_local_eid(handle, &ping_spec.dest, "ping");
        
    } else {
        if (dtn_parse_eid_string(&ping_spec.dest, dest_eid_str)) {
            fprintf(stderr, "invalid destination eid string '%s'\n",
                    dest_eid_str);
            exit(1);
        }
    }

    dest_len = strlen(ping_spec.dest.uri);
    if ((dest_len < 4) ||
        (strcmp(ping_spec.dest.uri + dest_len - 4, "ping") != 0))
    {
        fprintf(stderr, "\nWARNING: ping destination does not end in \"ping\"\n\n");
    }
    
    // if the user specified a source eid, register on it.
    // otherwise, build a local eid based on the configuration of
    // our dtn router plus the demux string
    snprintf(demux, sizeof(demux), "/ping.%d", getpid());
    if (source_eid_str[0] != '\0') {
        if (dtn_parse_eid_string(&source_eid, source_eid_str)) {
            fprintf(stderr, "invalid source eid string '%s'\n",
                    source_eid_str);
            exit(1);
        }
    } else {
        dtn_build_local_eid(handle, &source_eid, demux);
    }

    // set the source and replyto eids in the bundle spec
    if (debug) printf("source_eid [%s]\n", source_eid.uri);
    dtn_copy_eid(&ping_spec.source, &source_eid);
    dtn_copy_eid(&ping_spec.replyto, &source_eid);
    
    // now create a new registration based on the source
    memset(&reginfo, 0, sizeof(reginfo));
    dtn_copy_eid(&reginfo.endpoint, &source_eid);
    reginfo.flags = DTN_REG_DEFER;
    reginfo.regid = DTN_REGID_NONE;
    reginfo.expiration = 0;
    if ((ret = dtn_register(handle, &reginfo, &regid)) != 0) {
        fprintf(stderr, "error creating registration: %d (%s)\n",
                ret, dtn_strerror(dtn_errno(handle)));
        exit(1);
    }    
    if (debug) printf("dtn_register succeeded, regid %d\n", regid);

    // set the expiration time and request deletion status reports
    ping_spec.expiration = expiration;
    ping_spec.dopts = DOPTS_DELETE_RCPT;

    printf("PING [%s] (expiration %u)...\n", ping_spec.dest.uri, expiration);
    if (interval == 0) {
        printf("WARNING: zero second interval will result in flooding pings!!\n");
    }
    
    // loop, sending pings and polling for activity
    for (i = 0; count == 0 || i < count; ++i) {
        gettimeofday(&send_times[seqno], NULL);
        
        // fill in a short payload string, a nonce, and a sequence number
        // to verify the echo feature and make sure we're not getting
        // duplicate responses or ping responses from another app
        memcpy(&payload_contents.ping, PING_STR, 8);
        payload_contents.seqno = seqno;
        payload_contents.nonce = nonce;
        payload_contents.time = send_times[seqno].tv_sec;
        
        memset(&ping_payload, 0, sizeof(ping_payload));
        dtn_set_payload(&ping_payload, DTN_PAYLOAD_MEM,
                        (char*)&payload_contents, sizeof(payload_contents));
        
        memset(&bundle_id, 0, sizeof(bundle_id));
        if ((ret = dtn_send(handle, regid, &ping_spec, &ping_payload,
                            &bundle_id)) != 0) {
            fprintf(stderr, "error sending bundle: %d (%s)\n",
                    ret, dtn_strerror(dtn_errno(handle)));
            exit(1);
        }
        
        creation_times[seqno] = bundle_id.creation_ts;

        memset(&reply_spec, 0, sizeof(reply_spec));
        memset(&reply_payload, 0, sizeof(reply_payload));

        // now loop waiting for replies / status reports until it's
        // time to send again, adding twice the expiration time if we
        // just sent the last ping
        timeout = interval * 1000;
        if (i == count - 1)
            timeout += expiration * 2000;
        
        do {
            gettimeofday(&recv_start, 0);
            if ((ret = dtn_recv(handle, &reply_spec,
                                DTN_PAYLOAD_MEM, &reply_payload, timeout)) < 0)
            {
                if (dtn_errno(handle) == DTN_ETIMEOUT) {
                    break; // time to send again
                }
                
                fprintf(stderr, "error getting ping reply: %d (%s)\n",
                        ret, dtn_strerror(dtn_errno(handle)));
                exit(1);
            }
            gettimeofday(&recv_end, 0);
            
            if (reply_payload.status_report != NULL)
            {
                sr_data = reply_payload.status_report;
                if (sr_data->flags != STATUS_DELETED) {
                    fprintf(stderr, "(bad status report from %s: flags 0x%x)\n",
                            reply_spec.source.uri, sr_data->flags);
                    goto next;
                }

                // find the seqno corresponding to the original
                // transmission time in the status report
                int j = 0;
                for (j = 0; j < MAX_PINGS_IN_FLIGHT; ++j) {
                    if (creation_times[j].secs  ==
                            sr_data->bundle_id.creation_ts.secs &&
                        creation_times[j].seqno ==
                            sr_data->bundle_id.creation_ts.seqno)
                    {
                        printf("bundle deleted at [%s] (%s): seqno=%d, time=%ld ms\n",
                               reply_spec.source.uri,
                               dtn_status_report_reason_to_str(sr_data->reason),
                               j, TIMEVAL_DIFF_MSEC(recv_end, send_times[j]));
                        goto next;
                    }
                }

                printf("bundle deleted at [%s] (%s): ERROR: can't find seqno\n",
                       reply_spec.source.uri, 
                       dtn_status_report_reason_to_str(sr_data->reason));
            }
            else {
                if (reply_payload.buf.buf_len != sizeof(ping_payload_t))
                {
                    printf("%d bytes from [%s]: ERROR: length != %zu\n",
                           reply_payload.buf.buf_len,
                           reply_spec.source.uri,
                           sizeof(ping_payload_t));
                    goto next;
                }

                memcpy(&recv_contents, reply_payload.buf.buf_val,
                       sizeof(recv_contents));
                
                if (recv_contents.seqno > MAX_PINGS_IN_FLIGHT)
                {
                    printf("%d bytes from [%s]: ERROR: invalid seqno %d\n",
                           reply_payload.buf.buf_len,
                           reply_spec.source.uri,
                           recv_contents.seqno);
                    goto next;
                }

                if (recv_contents.nonce != nonce)
                {
                    printf("%d bytes from [%s]: ERROR: invalid nonce %u != %u\n",
                           reply_payload.buf.buf_len,
                           reply_spec.source.uri,
                           recv_contents.nonce, nonce);
                    goto next;
                }

                if (recv_contents.time != (u_int32_t)send_times[recv_contents.seqno].tv_sec)
                {
                    printf("%d bytes from [%s]: ERROR: time mismatch -- "
                           "seqno %u reply time %u != send time %lu\n",
                           reply_payload.buf.buf_len,
                           reply_spec.source.uri,
                           recv_contents.seqno,
                           recv_contents.time,
                           (long unsigned int)send_times[recv_contents.seqno].tv_sec);
                    goto next;
                }
                
                printf("%d bytes from [%s]: '%.*s' seqno=%d, time=%ld ms\n",
                       reply_payload.buf.buf_len,
                       reply_spec.source.uri,
                       (u_int)strlen(PING_STR),
                       reply_payload.buf.buf_val,
                       recv_contents.seqno,
                       TIMEVAL_DIFF_MSEC(recv_end,
                                         send_times[recv_contents.seqno]));
                fflush(stdout);
            }
next:
            dtn_free_payload(&reply_payload);
            timeout -= TIMEVAL_DIFF_MSEC(recv_end, recv_start);

            // once we get status from all the pings we're supposed to
            // send, we're done
            reply_count++;
            if (count != 0 && reply_count == count) {
                break;
            }

        } while (timeout > 0);
        
        seqno++;
        seqno %= MAX_PINGS_IN_FLIGHT;
    }

    dtn_close(handle);

    return 0;
}
Esempio n. 4
0
int
main(int argc, char** argv)
{
    int i, errs;
    int ret;
    dtn_handle_t handle;
    dtn_endpoint_id_t local_eid;
    dtn_reg_info_t reginfo;
    dtn_bundle_spec_t spec;
    dtn_bundle_payload_t payload;
    int call_bind;
    time_t now;

    // force stdout to always be line buffered, even if output is
    // redirected to a pipe or file
    setvbuf(stdout, (char *)NULL, _IOLBF, 0);
    
    progname = argv[0];

    parse_options(argc, argv);

    printf("dtnsink starting up -- waiting for %u bundles\n", count);

    // open the ipc handle
    if (verbose) printf("opening connection to dtn router...\n");
    int err = dtn_open(&handle);
    if (err != DTN_SUCCESS) {
        fprintf(stderr, "fatal error opening dtn handle: %s\n",
                dtn_strerror(err));
        exit(1);
    }
    if (verbose) printf("opened connection to dtn router...\n");

    // if we're not given a regid, or we're in change mode, we need to
    // build up the reginfo
    memset(&reginfo, 0, sizeof(reginfo));

    if ((regid == DTN_REGID_NONE) || change)
    {
        // if the specified eid starts with '/', then build a local
        // eid based on the configuration of our dtn router plus the
        // demux string. otherwise make sure it's a valid one
        if (endpoint[0] == '/') {
            if (verbose) printf("calling dtn_build_local_eid.\n");
            dtn_build_local_eid(handle, &local_eid, (char *) endpoint);
            if (verbose) printf("local_eid [%s]\n", local_eid.uri);
        } else {
            if (verbose) printf("calling parse_eid_string\n");
            if (dtn_parse_eid_string(&local_eid, endpoint)) {
                fprintf(stderr, "invalid destination endpoint '%s'\n",
                        endpoint);
                goto err;
            }
        }

        // create a new registration based on this eid
        dtn_copy_eid(&reginfo.endpoint, &local_eid);
        reginfo.regid             = regid;
        reginfo.expiration        = expiration;
        reginfo.flags             = failure_action;
        reginfo.script.script_val = failure_script;
        reginfo.script.script_len = strlen(failure_script) + 1;
    }

    if (change) {
        if ((ret = dtn_change_registration(handle, regid, &reginfo)) != 0) {
            fprintf(stderr, "error changing registration: %d (%s)\n",
                    ret, dtn_strerror(dtn_errno(handle)));
            goto err;
        }
        printf("change registration succeeded, regid %d\n", regid);
        goto done;
    }
    
    if (unregister) {
        if (dtn_unregister(handle, regid) != 0) {
            fprintf(stderr, "error in unregister regid %d: %s\n",
                    regid, dtn_strerror(dtn_errno(handle)));
            goto err;
        }
        
        printf("unregister succeeded, regid %d\n", regid);
        goto done;
    }
    
    // try to see if there is an existing registration that matches
    // the given endpoint, in which case we'll use that one.
    if (regid == DTN_REGID_NONE && ! no_find_reg) {
        if (dtn_find_registration(handle, &local_eid, &regid) != 0) {
            if (dtn_errno(handle) != DTN_ENOTFOUND) {
                fprintf(stderr, "error in find_registration: %s\n",
                        dtn_strerror(dtn_errno(handle)));
                goto err;
            }
        }
        printf("find registration succeeded, regid %d\n", regid);
        call_bind = 1;
    }
    
    // if the user didn't give us a registration to use, get a new one
    if (regid == DTN_REGID_NONE) {
        if ((ret = dtn_register(handle, &reginfo, &regid)) != 0) {
            fprintf(stderr, "error creating registration: %d (%s)\n",
                    ret, dtn_strerror(dtn_errno(handle)));
            goto err;
        }

        printf("register succeeded, regid %d\n", regid);
        call_bind = 0;
    } else {
        call_bind = 1;
    }
    
    if (register_only) {
        goto done;
    }

    if (call_bind) {
        // bind the current handle to the found registration
        printf("binding to regid %d\n", regid);
        if (dtn_bind(handle, regid) != 0) {
            fprintf(stderr, "error binding to registration: %s\n",
                    dtn_strerror(dtn_errno(handle)));
            goto err;
        }
    }

    // keep track of what we've seen
    char *received = (char *)malloc(count + 1);
    memset(received, '\0', count);

    // loop waiting for bundles
    fprintf(stderr, "waiting %d seconds for first bundle...\n",
	    (MAX_STARTUP_TRIES)*RECV_TIMEOUT/1000);
    for (i = 1; i <= count; ++i) {
	int tries;
	uint32_t which;
	uint32_t size;

        memset(&spec, 0, sizeof(spec));
        memset(&payload, 0, sizeof(payload));

	/* 
	 * this is a little tricky. We want dtn_recv to time out after
	 * RECV_TIMEOUT ms, so we don't wait a long time for a bundle
	 * if something is broken and no bundle is coming.  But we
	 * want to be friendly and wait patiently for the first
	 * bundle, in case dtnsource is slow in getting off the mark.
	 * 
	 * So we loop at most MAX_STARTUP_TRIES times
	 */
	tries = 0;
	while ((ret = dtn_recv(handle, &spec, bundletype, &payload, 
			       RECV_TIMEOUT)) < 0) {
	    /* if waiting for the first bundle and we timed out be patient */
	    if (dtn_errno(handle) == DTN_ETIMEOUT) {
		if (i == 1 && ++tries < MAX_STARTUP_TRIES) {
		    fprintf(stderr, "waiting %d seconds for first bundle...\n",
			    (MAX_STARTUP_TRIES-tries)*RECV_TIMEOUT/1000);
		} else {
		    /* timed out waiting, something got dropped */
		    fprintf(stderr, "timeout waiting for bundle %d\n", i);
		    goto bail;
		}
	    } else {
	        /* a bad thing has happend in recv, or we've lost patience */
		fprintf(stderr, "error in dtn_recv: %d (%d, %s)\n", ret, 
			dtn_errno(handle), dtn_strerror(dtn_errno(handle)));
		goto bail;
	    }
	}

	if (i == 1) {
	    now = time(0);
	    printf("received first bundle at %s\n", ctime(&now));
	}
	if (verbose) {
	    printf("bundle %d received successfully: id %s,%llu.%llu\n",
		   i,
		   spec.source.uri,
		   spec.creation_ts.secs,
		   spec.creation_ts.seqno);
	}

	if (!promiscuous) {
	    /* check to see which bundle this is */
	    // Files need to be handled differently than memory transfers
	    if (payload.location == DTN_PAYLOAD_FILE) {
		if (handle_file_transfer(payload, &size, &which) < 0) {
		    dtn_free_payload(&payload);
		    continue;
		}
	    } else {
		which = ntohl(*(uint32_t *)payload.buf.buf_val);
		size = payload.buf.buf_len;
	    }
	    
	    if (which > (uint32_t) count) {
		// note that the above cast is safe as count always >= 0
		fprintf(stderr, "-- expecting %d bundles, saw bundle %u\n", 
			count, which);
	    }
	    else if (which <= 0) { /* because I am paranoid -DJE */
		fprintf(stderr, "-- didn't expect bundle %u\n", which);
	    }
	    else {
	      ++received[which];
	    }
	}

	// XXX should verify size here...

	/* all done, get next one */
	dtn_free_payload(&payload);
    }

bail:
    for (i = 1; i <= count; ++i) {
	if (received[i] == 0) {
	    int j = i + 1;
	    while (j <= count && received[j] == 0)
		++j;
	    if (j == i + 1)
		printf("bundle %d: dropped\n", i);
	    else
		printf("bundles %d-%d dropped\n", i, j - 1);
	    errs += (j - i);
	    i += (j - i - 1);
	} else if (received[i] > 1) {
	    printf("bundle %d: received %d copies\n", i, received[i]);
	    ++errs;
	}
    }
    if (errs == 0) {
	printf("all %d bundles received correctly\n", count);
    }
    free(received);
    now = time(0);
    printf("terminating at %s\n", ctime(&now));

done:
    dtn_close(handle);
    return 0;

err:
    dtn_close(handle);
    return 1;
}
Esempio n. 5
0
int
main(int argc, const char** argv)
{
    int ret;
    dtn_handle_t handle;
    dtn_endpoint_id_t source_eid;
    dtn_endpoint_id_t replyto_eid;
    dtn_reg_info_t reginfo;
    dtn_reg_id_t regid;
    dtn_bundle_spec_t ping_spec;
    dtn_bundle_spec_t reply_spec;
    dtn_bundle_payload_t ping_payload;
    ping_payload_t payload_contents;
    ping_payload_t recv_contents;
    dtn_bundle_payload_t reply_payload;
    dtn_bundle_status_report_t* sr_data;
    dtn_bundle_id_t bundle_id;
    int debug = 1;
    char demux[64];
    int dest_len = 0;
    struct timeval send_time, now;
    u_int32_t nonce;
    int done;
    time_t clock;
    struct tm* tm_buf;
    
    // force stdout to always be line buffered, even if output is
    // redirected to a pipe or file
    setvbuf(stdout, (char *)NULL, _IOLBF, 0);
    
    doOptions(argc, argv);

    memset(&ping_spec, 0, sizeof(ping_spec));

    gettimeofday(&now, 0);
    srand(now.tv_sec);
    nonce = rand();
    
    // open the ipc handle
    int err = 0;
    if (api_IP_set) err = dtn_open_with_IP(api_IP,api_port,&handle);
    else err = dtn_open(&handle);

    if (err != DTN_SUCCESS) {
        fprintf(stderr, "fatal error opening dtn handle: %s\n",
                dtn_strerror(err));
        exit(1);
    }

    // make sure they supplied a valid destination eid or
    // "localhost", in which case we just use the local daemon
    if (strcmp(dest_eid_str, "localhost") == 0) {
        dtn_build_local_eid(handle, &ping_spec.dest, "ping");
        
    } else {
        if (dtn_parse_eid_string(&ping_spec.dest, dest_eid_str)) {
            fprintf(stderr, "invalid destination eid string '%s'\n",
                    dest_eid_str);
            exit(1);
        }
    }

    dest_len = strlen(ping_spec.dest.uri);
    if ((dest_len < 4) ||
        (strcmp(ping_spec.dest.uri + dest_len - 4, "ping") != 0))
    {
        fprintf(stderr, "\nWARNING: ping destination does not end in \"ping\"\n\n");
    }
    
    // if the user specified a source eid, register on it.
    // otherwise, build a local eid based on the configuration of
    // our dtn router plus the demux string
    snprintf(demux, sizeof(demux), "/traceroute.%d", getpid());
    if (source_eid_str[0] != '\0') {
        if (dtn_parse_eid_string(&source_eid, source_eid_str)) {
            fprintf(stderr, "invalid source eid string '%s'\n",
                    source_eid_str);
            exit(1);
        }
    } else {
        dtn_build_local_eid(handle, &source_eid, demux);
    }

    if (debug) printf("source_eid [%s]\n", source_eid.uri);
    dtn_copy_eid(&ping_spec.source, &source_eid);
    
    // Make the replyto EID
    if ( replyto_eid_str[0]!=0 ) {
        if (dtn_parse_eid_string(&replyto_eid, replyto_eid_str)) {
            fprintf(stderr, "invalid replyto eid string '%s'\n",
                    replyto_eid_str);
            exit(1);
        }
        dtn_copy_eid(&ping_spec.replyto, &replyto_eid);
        printf("using user-supplied replyto\n");
    } else {
        dtn_copy_eid(&ping_spec.replyto, &source_eid);
        printf("using default replyto\n");
    }

    // now create a new registration based on the source
    // if the replyto EID is unspecified or the same as the
    // source EID then we'll get status reports, otherwise
    // they'll go somewhere else.
    memset(&reginfo, 0, sizeof(reginfo));
    dtn_copy_eid(&reginfo.endpoint, &source_eid);
    reginfo.flags = DTN_REG_DROP;
    reginfo.regid = DTN_REGID_NONE;
    reginfo.expiration = 0;
    if ((ret = dtn_register(handle, &reginfo, &regid)) != 0) {
        fprintf(stderr, "error creating registration: %d (%s)\n",
                ret, dtn_strerror(dtn_errno(handle)));
        exit(1);
    }    
    if (debug) printf("dtn_register succeeded, regid %d\n", regid);

    // set the expiration time and request a bunch of status reports
    ping_spec.expiration = expiration;
    ping_spec.dopts = DOPTS_DELETE_RCPT |
                      DOPTS_RECEIVE_RCPT |
                      DOPTS_FORWARD_RCPT |
                      DOPTS_DELIVERY_RCPT;

    // loop, sending pings and polling for activity
    gettimeofday(&send_time, NULL);
        
    // fill in a short payload string, a nonce, and a sequence number
    // to verify the echo feature and make sure we're not getting
    // duplicate responses or ping responses from another app
    memcpy(&payload_contents.ping, PING_STR, 8);
    payload_contents.seqno = 0;
    payload_contents.nonce = nonce;
    payload_contents.time  = send_time.tv_sec;
        
    memset(&ping_payload, 0, sizeof(ping_payload));
    dtn_set_payload(&ping_payload, DTN_PAYLOAD_MEM,
                    (char*)&payload_contents, sizeof(payload_contents));
        
    memset(&bundle_id, 0, sizeof(bundle_id));
    if ((ret = dtn_send(handle, regid, &ping_spec, &ping_payload, &bundle_id)) != 0) {
        fprintf(stderr, "error sending bundle: %d (%s)\n",
                ret, dtn_strerror(dtn_errno(handle)));
        exit(1);
    }
        
    memset(&reply_spec, 0, sizeof(reply_spec));
    memset(&reply_payload, 0, sizeof(reply_payload));

    clock = time(&clock);
    tm_buf = gmtime(&clock);
    printf("%s: sent at %.*s UTC\n",
           ping_spec.source.uri, 24, asctime(tm_buf));
    
    // now loop waiting for replies / status reports until we're done
    done = 0;
    while (1) {
        int timeout = done ? wait_after_done * 1000 : -1;
        if ((ret = dtn_recv(handle, &reply_spec,
                            DTN_PAYLOAD_MEM, &reply_payload, timeout)) < 0)
        {
            if (done && dtn_errno(handle) == DTN_ETIMEOUT) {
                break;
            }
            fprintf(stderr, "error getting ping reply: %d (%s)\n",
                    ret, dtn_strerror(dtn_errno(handle)));
            exit(1);
        }

        gettimeofday(&now, 0);
            
        if (reply_payload.status_report != NULL)
        {
            sr_data = reply_payload.status_report;
            if (sr_data->flags & STATUS_RECEIVED)
            {
                clock = sr_data->receipt_ts.secs + DTNTIME_OFFSET;
                tm_buf = gmtime(&clock);
                printf("%s: received at %.*s UTC (%ld ms rtt)\n",
                       reply_spec.source.uri, 24, asctime(tm_buf),
                       TIMEVAL_DIFF_MSEC(now, send_time));
            }
            if (sr_data->flags & STATUS_FORWARDED)
            {
                clock = sr_data->forwarding_ts.secs + DTNTIME_OFFSET;
                tm_buf = gmtime(&clock);
                printf("%s: forwarded at %.*s UTC (%ld ms rtt)\n",
                       reply_spec.source.uri, 24, asctime(tm_buf),
                       TIMEVAL_DIFF_MSEC(now, send_time));
            }
            if (sr_data->flags & STATUS_DELIVERED)
            {
                clock = sr_data->delivery_ts.secs + DTNTIME_OFFSET;
                tm_buf = gmtime(&clock);
                printf("%s: delivered at %.*s UTC (%ld ms rtt)\n",
                       reply_spec.source.uri, 24, asctime(tm_buf),
                       TIMEVAL_DIFF_MSEC(now, send_time));
            }
            if (sr_data->flags & STATUS_DELETED)
            {
                clock = sr_data->deletion_ts.secs + DTNTIME_OFFSET;
                tm_buf = gmtime(&clock);
                printf("%s: deleted at %.*s UTC (%s) (%ld ms rtt)\n",
                       reply_spec.source.uri, 24, asctime(tm_buf),
                       dtn_status_report_reason_to_str(sr_data->reason),
                       TIMEVAL_DIFF_MSEC(now, send_time));
                break;
            }
        }
        else {
            if (reply_payload.buf.buf_len != sizeof(ping_payload_t))
            {
                printf("%d bytes from [%s]: ERROR: length != %zu\n",
                       reply_payload.buf.buf_len,
                       reply_spec.source.uri,
                       sizeof(ping_payload_t));
                break;
            }

            memcpy(&recv_contents, reply_payload.buf.buf_val,
                   sizeof(recv_contents));
                
            if (recv_contents.seqno != 0)
            {
                printf("%d bytes from [%s]: ERROR: invalid seqno %d\n",
                       reply_payload.buf.buf_len,
                       reply_spec.source.uri,
                       recv_contents.seqno);
                break;
            }

            if (recv_contents.nonce != nonce)
            {
                printf("%d bytes from [%s]: ERROR: invalid nonce %u != %u\n",
                       reply_payload.buf.buf_len,
                       reply_spec.source.uri,
                       recv_contents.nonce, nonce);
                break;
            }

            if ((int)recv_contents.time != (int)send_time.tv_sec)
            {
                printf("%d bytes from [%s]: ERROR: time mismatch %u != %lu\n",
                       reply_payload.buf.buf_len,
                       reply_spec.source.uri,
                       recv_contents.time,
                       (long unsigned int)send_time.tv_sec);
            }
                
            clock = reply_spec.creation_ts.secs + DTNTIME_OFFSET;
            tm_buf = gmtime(&clock);
            printf("%s: echo reply at %.*s UTC (%ld ms rtt)\n",
                   reply_spec.source.uri, 24, asctime(tm_buf),
                   TIMEVAL_DIFF_MSEC(now, send_time));
            done = 1;
        }
        
        dtn_free_payload(&reply_payload);
    }
    
    dtn_close(handle);
    
    return 0;
}