tools, lib: cbr tool for bandwidth testing

The tool sends constant bandwidth traffic between a client and a
server. cbr --help for more info.

Adds time_utils.h to the library containing useful functions for
arithmetic with timespec and timeval structures.

1 files changed, 124 insertions, 0 deletions

diff --git a/src/tools/cbr/cbr.c b/src/tools/cbr/cbr.c
new file mode 100644
index 00000000..2317cd62
--- /dev/null
+++ b/src/tools/cbr/cbr.c
@@ -0,0 +1,124 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * CBR traffic generator
+ *
+ *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *    Sander Vrijders   <sander.vrijders@intec.ugent.be>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define _POSIX_C_SOURCE 199506L
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+#include <limits.h>
+#include <time.h>
+#include <stdbool.h>
+
+#define SERVER_AP_NAME "cbr-server"
+#define CLIENT_AP_NAME "echo-client"
+
+#define MILLION 1000000
+#define BILLION 1000000000
+
+#define BUF_SIZE 1500
+
+#include "cbr_client.c"
+
+struct s {
+        long interval;
+        long timeout;
+} server_settings;
+
+#include "cbr_server.c"
+
+static void usage(void)
+{
+        printf("Usage: cbr [OPTION]...\n"
+               "Sends SDU's from client to server at a constant bit rate.\n\n"
+               "  -l, --listen              Run in server mode\n"
+               "\n"
+               "Server options:\n"
+               "  -i, --interval            Server report interval (s)\n"
+               "  -t, --timeout             Server timeout interval (s)\n"
+               "\n"
+               "Client options:\n"
+               "  -d  --duration            Duration for sending (s)\n"
+               "  -s, --size                SDU size (B)\n"
+               "  -r, --rate                Rate (b/s)\n"
+               "\n\n"
+               "      --help                Display this help text and exit\n");
+}
+
+int main(int argc, char ** argv)
+{
+        int  duration = 60;      /* One minute test */
+        int  size     = 1000;    /* 1000 byte SDU's */
+        long rate     = 1000000; /* 1 Mb/s */
+        char * rem;
+
+        bool server = false;
+        server_settings.interval = 1; /* One second reporting interval */
+        server_settings.timeout  = 1;
+
+        argc--;
+        argv++;
+        while (argc > 0) {
+                if (strcmp(*argv, "-i") == 0 ||
+                    strcmp(*argv, "--interval") == 0) {
+                        server_settings.interval = strtol(*(++argv), &rem, 10);
+                        --argc;
+                } else if (strcmp(*argv, "-t") == 0 ||
+                           strcmp(*argv, "--timeout") == 0) {
+                        server_settings.timeout = strtol(*(++argv), &rem, 10);
+                        --argc;
+                } else if (strcmp(*argv, "-d") == 0 ||
+                           strcmp(*argv, "--duration") == 0) {
+                        duration = strtol(*(++argv), &rem, 10);
+                        --argc;
+                } else if (strcmp(*argv, "-s") == 0 ||
+                    strcmp(*argv, "--size") == 0) {
+                        size = strtol(*(++argv), &rem, 10);
+                        --argc;
+                } else if (strcmp(*argv, "-r") == 0 ||
+                           strcmp(*argv, "--rate") == 0) {
+                        rate = strtol(*(++argv), &rem, 10);
+                        if (*rem == 'k')
+                                rate *= 1000;
+                        if (*rem == 'M')
+                                rate *= MILLION;
+                        if (*rem == 'G')
+                                rate *= BILLION;
+                        --argc;
+                } else if (strcmp(*argv, "-l") == 0 ||
+                    strcmp(*argv, "--listen") == 0) {
+                        server = true;
+                } else {
+                        usage();
+                        return 0;
+                }
+                argc--;
+                argv++;
+        }
+
+        if (server) {
+                return server_main();
+        }
+
+        return client_main(duration, size, rate);
+}