l2tpns/throttlectl.c

#include <string.h>
#include <netinet/ip6.h>
#include "dhcp6.h"
#include "l2tpns.h"
#include "plugin.h"
#include "control.h"

/* throttle control */

int plugin_api_version = PLUGIN_API_VERSION;
static struct pluginfuncs *f = 0;

char *plugin_control_help[] = {
    "  throttle USER|SID [RATE|[in|out] RATE ...]  Throttle user traffic",
    "  unthrottle USER|SID                         Stop throttling user",
    0
};

int plugin_control(struct param_control *data)
{
    sessionidt session;
    sessiont *s = 0;
    int flag;
    char *end;
    int rate_in = 0;
    int rate_out = 0;

    if (data->argc < 1)
	return PLUGIN_RET_OK;

    if (strcmp(data->argv[0], "throttle") &&
    	strcmp(data->argv[0], "unthrottle"))
	return PLUGIN_RET_OK; // not for us

    if (!data->iam_master)
	return PLUGIN_RET_NOTMASTER;

    flag = data->argv[0][0] == 't';

    if (flag)
    {
	if (data->argc < 2 || data->argc > 6)
	{
	    data->response = NSCTL_RES_ERR;
	    data->additional = "requires username or session id and optional rate(s)";
	    return PLUGIN_RET_STOP;
	}
    }
    else
    {
	if (data->argc != 2)
	{
	    data->response = NSCTL_RES_ERR;
	    data->additional = "requires username or session id";
	    return PLUGIN_RET_STOP;
	}
    }

    if (!(session = strtol(data->argv[1], &end, 10)) || *end)
	session = f->get_session_by_username(data->argv[1]);

    if (session)
	s = f->get_session_by_id(session);

    if (!s || !s->ip)
    {
	data->response = NSCTL_RES_ERR;
	data->additional = "session not found";
	return PLUGIN_RET_STOP;
    }

    if (flag)
    {
	rate_in = rate_out = -1;
	if (data->argc == 2)
	{
	    unsigned long *rate = f->getconfig("throttle_speed", UNSIGNED_LONG);
	    rate_in = rate_out = *rate;
	}
	else if (data->argc == 3)
	{
	    rate_in = rate_out = atoi(data->argv[2]);
	}
	else
	{
	    int i;
	    for (i = 2; i < data->argc - 1; i += 2)
	    {
		int len = strlen(data->argv[i]);
		if (!strncmp(data->argv[i], "in", len))
		{
		    rate_in = atoi(data->argv[i+1]);
		}
		else if (!strncmp(data->argv[i], "out", len))
		{
		    rate_out = atoi(data->argv[i+1]);
		}
		else
		{
		    data->response = NSCTL_RES_ERR;
		    data->additional = "invalid rate";
		    return PLUGIN_RET_STOP;
		}
	    }
	}

	if (!rate_in || !rate_out)
	{
	    data->response = NSCTL_RES_ERR;
	    data->additional = "invalid rate";
	    return PLUGIN_RET_STOP;
	}
    }

    if (rate_in != -1 && rate_in == s->throttle_in &&
	rate_out != -1 && rate_out == s->throttle_out)
    {
	data->response = NSCTL_RES_ERR;
	data->additional = flag ? "already throttled" : "not throttled";
	return PLUGIN_RET_STOP;
    }

    f->throttle(session, rate_in, rate_out);
    f->session_changed(session);

    data->response = NSCTL_RES_OK;
    data->additional = 0;

    return PLUGIN_RET_STOP;
}

int plugin_init(struct pluginfuncs *funcs)
{
    return ((f = funcs)) ? 1 : 0;
}