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/* Netfilter Driver for IPSec VPN Client
*
* Copyright(c) 2012 Samsung Electronics
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/*
* sshinetprint.c
*
* Implementation of inet API IP address printing functions.
*
*/
#include "sshincludes.h"
#include "sshinet.h"
/* Prints the IP address into the buffer in string format. If the buffer
is too short, the address is truncated. This returns `buf'. */
void ssh_ipaddr_ipv4_print(const unsigned char *data,
unsigned char *buf, size_t buflen)
{
snprintf(buf, buflen, "%d.%d.%d.%d", data[0], data[1], data[2], data[3]);
}
void ssh_ipaddr_ipv6_print(const unsigned char *data,
unsigned char *buf, size_t buflen,
SshUInt32 scope)
{
int i, j;
unsigned char *cp;
int opt_start = 8;
int opt_len = 0, n, l;
SshUInt16 val;
/* Optimize the largest zero-block from the address. */
for (i = 0; i < 8; i++)
if (SSH_GET_16BIT(data + i * 2) == 0)
{
for (j = i + 1; j < 8; j++)
{
val = SSH_GET_16BIT(data + j * 2);
if (val != 0)
break;
}
if (j - i > opt_len)
{
opt_start = i;
opt_len = j - i;
}
i = j;
}
if (opt_len <= 1)
/* Disable optimization. */
opt_start = 8;
cp = buf;
n = buflen;
/* Format the result. */
for (i = 0; i < 8; i++)
{
if (i == opt_start)
{
if (i == 0)
{
*cp++ = ':';
n -= 1;
if (n <= 1)
break;
}
*cp++ = ':';
n -= 1;
if (n <= 1)
break;
i += opt_len - 1;
}
else
{
l = snprintf(cp, n, "%x",
(unsigned int) SSH_GET_16BIT(data + i * 2));
if (l == -1)
{
*cp = '\0';
return;
}
cp += l;
n -= l;
if (n <= 1)
break;
if (i + 1 < 8)
{
*cp = ':';
cp++;
n -= 1;
if (n <= 1)
break;
}
}
}
/* Put scope id there, if stored. */
if (scope != 0)
{
l = snprintf(cp, n, "%%%u", (unsigned int) scope);
if (l > 0)
cp += l;
}
*cp = '\0';
}
unsigned char *ssh_ipaddr_print(const SshIpAddr ip, unsigned char *buf,
size_t buflen)
{
if (SSH_IP_IS4(ip))
ssh_ipaddr_ipv4_print(ip->addr_data, buf, buflen);
#if defined(WITH_IPV6)
else if (SSH_IP_IS6(ip))
ssh_ipaddr_ipv6_print(ip->addr_data, buf, buflen, SSH_IP6_SCOPE_ID(ip));
#endif /* WITH_IPV6 */
else if (buflen > 0)
buf[0] = '\0';
return buf;
}
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