/usr/src/xtables-addons-2.6/extensions/ACCOUNT/libxt_ACCOUNT_cl.c is in xtables-addons-dkms 2.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2004 by Intra2net AG *
* opensource@intra2net.com *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License *
* version 2.1 as published by the Free Software Foundation; *
* *
***************************************************************************/
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <linux/if.h>
#include <libxt_ACCOUNT_cl.h>
int ipt_ACCOUNT_init(struct ipt_ACCOUNT_context *ctx)
{
memset(ctx, 0, sizeof(struct ipt_ACCOUNT_context));
ctx->handle.handle_nr = -1;
ctx->sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
if (ctx->sockfd < 0) {
ctx->sockfd = -1;
ctx->error_str = "Can't open socket to kernel. "
"Permission denied or ipt_ACCOUNT module not loaded";
return -1;
}
// 4096 bytes default buffer should save us from reallocations
// as it fits 200 concurrent active clients
if ((ctx->data = malloc(IPT_ACCOUNT_MIN_BUFSIZE)) == NULL) {
close(ctx->sockfd);
ctx->sockfd = -1;
ctx->error_str = "Out of memory for data buffer";
return -1;
}
ctx->data_size = IPT_ACCOUNT_MIN_BUFSIZE;
return 0;
}
void ipt_ACCOUNT_free_entries(struct ipt_ACCOUNT_context *ctx)
{
if (ctx->handle.handle_nr != -1) {
setsockopt(ctx->sockfd, IPPROTO_IP, IPT_SO_SET_ACCOUNT_HANDLE_FREE,
&ctx->handle, sizeof(struct ipt_acc_handle_sockopt));
ctx->handle.handle_nr = -1;
}
ctx->handle.itemcount = 0;
ctx->pos = 0;
}
void ipt_ACCOUNT_deinit(struct ipt_ACCOUNT_context *ctx)
{
free(ctx->data);
ctx->data = NULL;
ipt_ACCOUNT_free_entries(ctx);
close(ctx->sockfd);
ctx->sockfd = -1;
}
int ipt_ACCOUNT_read_entries(struct ipt_ACCOUNT_context *ctx,
const char *table, char dont_flush)
{
unsigned int s = sizeof(struct ipt_acc_handle_sockopt);
unsigned int new_size;
int rtn;
strncpy(ctx->handle.name, table, ACCOUNT_TABLE_NAME_LEN-1);
// Get table information
if (!dont_flush)
rtn = getsockopt(ctx->sockfd, IPPROTO_IP,
IPT_SO_GET_ACCOUNT_PREPARE_READ_FLUSH, &ctx->handle, &s);
else
rtn = getsockopt(ctx->sockfd, IPPROTO_IP, IPT_SO_GET_ACCOUNT_PREPARE_READ,
&ctx->handle, &s);
if (rtn < 0) {
ctx->error_str = "Can't get table information from kernel. "
"Does it exist?";
return -1;
}
// Check data buffer size
ctx->pos = 0;
new_size = ctx->handle.itemcount * sizeof(struct ipt_acc_handle_ip);
// We want to prevent reallocations all the time
if (new_size < IPT_ACCOUNT_MIN_BUFSIZE)
new_size = IPT_ACCOUNT_MIN_BUFSIZE;
// Reallocate if it's too small or twice as big
if (ctx->data_size < new_size || ctx->data_size > new_size * 2) {
// Free old buffer
free(ctx->data);
ctx->data_size = 0;
if ((ctx->data = malloc(new_size)) == NULL) {
ctx->error_str = "Out of memory for data buffer";
ipt_ACCOUNT_free_entries(ctx);
return -1;
}
ctx->data_size = new_size;
}
// Copy data from kernel
memcpy(ctx->data, &ctx->handle, sizeof(struct ipt_acc_handle_sockopt));
rtn = getsockopt(ctx->sockfd, IPPROTO_IP, IPT_SO_GET_ACCOUNT_GET_DATA,
ctx->data, &ctx->data_size);
if (rtn < 0) {
ctx->error_str = "Can't get data from kernel. "
"Check /var/log/messages for details.";
ipt_ACCOUNT_free_entries(ctx);
return -1;
}
// Free kernel handle but don't reset pos/itemcount
setsockopt(ctx->sockfd, IPPROTO_IP, IPT_SO_SET_ACCOUNT_HANDLE_FREE,
&ctx->handle, sizeof(struct ipt_acc_handle_sockopt));
ctx->handle.handle_nr = -1;
return 0;
}
struct ipt_acc_handle_ip *ipt_ACCOUNT_get_next_entry(struct ipt_ACCOUNT_context *ctx)
{
struct ipt_acc_handle_ip *rtn;
// Empty or no more items left to return?
if (!ctx->handle.itemcount || ctx->pos >= ctx->handle.itemcount)
return NULL;
// Get next entry
rtn = (struct ipt_acc_handle_ip *)(ctx->data + ctx->pos
* sizeof(struct ipt_acc_handle_ip));
ctx->pos++;
return rtn;
}
int ipt_ACCOUNT_get_handle_usage(struct ipt_ACCOUNT_context *ctx)
{
unsigned int s = sizeof(struct ipt_acc_handle_sockopt);
if (getsockopt(ctx->sockfd, IPPROTO_IP,
IPT_SO_GET_ACCOUNT_GET_HANDLE_USAGE, &ctx->handle, &s) < 0) {
ctx->error_str = "Can't get handle usage information from kernel";
return -1;
}
ctx->handle.handle_nr = -1;
return ctx->handle.itemcount;
}
int ipt_ACCOUNT_free_all_handles(struct ipt_ACCOUNT_context *ctx)
{
if (setsockopt(ctx->sockfd, IPPROTO_IP,
IPT_SO_SET_ACCOUNT_HANDLE_FREE_ALL, NULL, 0) < 0) {
ctx->error_str = "Can't free all kernel handles";
return -1;
}
return 0;
}
int ipt_ACCOUNT_get_table_names(struct ipt_ACCOUNT_context *ctx)
{
int rtn = getsockopt(ctx->sockfd, IPPROTO_IP,
IPT_SO_GET_ACCOUNT_GET_TABLE_NAMES,
ctx->data, &ctx->data_size);
if (rtn < 0) {
ctx->error_str = "Can't get table names from kernel. Out of memory, "
"MINBUFISZE too small?";
return -1;
}
ctx->pos = 0;
return 0;
}
const char *ipt_ACCOUNT_get_next_name(struct ipt_ACCOUNT_context *ctx)
{
const char *rtn;
if (((char *)ctx->data)[ctx->pos] == 0)
return 0;
rtn = ctx->data + ctx->pos;
ctx->pos += strlen(ctx->data + ctx->pos) + 1;
return rtn;
}
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