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/**
* @file
*
* Routines to render various data structures used by libapol.
*
* @author Jeremy A. Mowery jmowery@tresys.com
* @author Jason Tang jtang@tresys.com
* @author David Windsor dwindsor@tresys.com
*
* Copyright (C) 2003-2007 Tresys Technology, LLC
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <apol/context-query.h>
#include <apol/policy.h>
#include <apol/render.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#ifndef WORDS_BIGENDIAN
extern void swab(const void *from, void *to, ssize_t n);
#endif
#if LINK_SHARED == 1
__asm__(".symver apol_ipv4_addr_render_old,apol_ipv4_addr_render@");
__asm__(".symver apol_ipv4_addr_render_new,apol_ipv4_addr_render@@VERS_4.1");
#endif
/**
* @brief Internal version of apol_ipv4_addr_render() version 4.1
*
* Implementation of the exported function apol_ipv4_addr_render()
* for version 4.1; this symbol name is not exported.
*/
char *apol_ipv4_addr_render_new(const apol_policy_t * policydb, uint32_t addr[4])
{
char buf[40], *b;
unsigned char *p = (unsigned char *)&(addr[0]);
snprintf(buf, sizeof(buf), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
if ((b = strdup(buf)) == NULL) {
ERR(policydb, "%s", strerror(ENOMEM));
}
return b;
}
#if LINK_SHARED == 0
char *apol_ipv4_addr_render(const apol_policy_t * policydb, uint32_t addr[4])
{
return apol_ipv4_addr_render_new(policydb, addr);
}
#endif
/**
* @brief Internal version of apol_ipv4_addr_render() version 4.0 or earlier
* @deprecated use the 4.1 version.
* @see apol_ipv4_addr_render()
*/
char *apol_ipv4_addr_render_old(apol_policy_t * policydb, uint32_t addr)
{
char buf[40], *b;
unsigned char *p = (unsigned char *)&addr;
snprintf(buf, sizeof(buf), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
if ((b = strdup(buf)) == NULL) {
ERR(policydb, "%s", strerror(ENOMEM));
}
return b;
}
char *apol_ipv6_addr_render(const apol_policy_t * policydb, uint32_t addr[4])
{
uint16_t tmp[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
int i, sz = 0, retv;
char buf[40], *b; /* 8 * 4 hex digits + 7 * ':' + '\0' == max size of string */
int contract = 0, prev_contr = 0, contr_idx_end = -1;
for (i = 0; i < 4; i++) {
uint32_t a;
#ifdef WORDS_BIGENDIAN
a = addr[i];
#else
swab(addr + i, &a, sizeof(a));
#endif
/* have to use division and mod here, so as to ignore
* host system's byte ordering */
tmp[2 * i] = a % (1 << 16);
tmp[2 * i + 1] = a / (1 << 16);
}
for (i = 0; i < 8; i++) {
if (tmp[i] == 0) {
contract++;
if (i == 7 && contr_idx_end == -1)
contr_idx_end = 8;
} else {
if (contract > prev_contr) {
contr_idx_end = i;
}
prev_contr = contract;
contract = 0;
}
}
if (prev_contr > contract)
contract = prev_contr;
for (i = 0; i < 8; i++) {
if (i == contr_idx_end - contract) {
retv = snprintf(buf + sz, 40 - sz, i ? ":" : "::");
sz += retv;
} else if (i > contr_idx_end - contract && i < contr_idx_end) {
continue;
} else {
retv = snprintf(buf + sz, 40 - sz, i == 7 ? "%04x" : "%04x:", tmp[i]);
sz += retv;
}
}
buf[sz] = '\0';
if ((b = strdup(buf)) == NULL) {
ERR(policydb, "%s", strerror(ENOMEM));
}
return b;
}
char *apol_qpol_context_render(const apol_policy_t * p, const qpol_context_t * context)
{
apol_context_t *c = NULL;
char *rendered_context;
if (p == NULL || context == NULL) {
ERR(p, "%s", strerror(EINVAL));
errno = EINVAL;
return NULL;
}
if ((c = apol_context_create_from_qpol_context(p, context)) == NULL) {
return NULL;
}
rendered_context = apol_context_render(p, c);
apol_context_destroy(&c);
return rendered_context;
}
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