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/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
PulseAudio 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.
PulseAudio 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 PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <sys/types.h>
#include <string.h>
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_IN_SYSTM_H
#include <netinet/in_systm.h>
#endif
#ifdef HAVE_NETINET_IP_H
#include <netinet/ip.h>
#endif
#include <pulse/xmalloc.h>
#include <pulsecore/core-util.h>
#include <pulsecore/llist.h>
#include <pulsecore/log.h>
#include <pulsecore/macro.h>
#include <pulsecore/socket.h>
#include <pulsecore/arpa-inet.h>
#include "ipacl.h"
struct acl_entry {
PA_LLIST_FIELDS(struct acl_entry);
int family;
struct in_addr address_ipv4;
#ifdef HAVE_IPV6
struct in6_addr address_ipv6;
#endif
int bits;
};
struct pa_ip_acl {
PA_LLIST_HEAD(struct acl_entry, entries);
};
pa_ip_acl* pa_ip_acl_new(const char *s) {
const char *state = NULL;
char *a;
pa_ip_acl *acl;
pa_assert(s);
acl = pa_xnew(pa_ip_acl, 1);
PA_LLIST_HEAD_INIT(struct acl_entry, acl->entries);
while ((a = pa_split(s, ";", &state))) {
char *slash;
struct acl_entry e, *n;
uint32_t bits;
if ((slash = strchr(a, '/'))) {
*slash = 0;
slash++;
if (pa_atou(slash, &bits) < 0) {
pa_log_warn("Failed to parse number of bits: %s", slash);
goto fail;
}
} else
bits = (uint32_t) -1;
if (inet_pton(AF_INET, a, &e.address_ipv4) > 0) {
e.bits = bits == (uint32_t) -1 ? 32 : (int) bits;
if (e.bits > 32) {
pa_log_warn("Number of bits out of range: %i", e.bits);
goto fail;
}
e.family = AF_INET;
if (e.bits < 32 && (uint32_t) (ntohl(e.address_ipv4.s_addr) << e.bits) != 0)
pa_log_warn("Host part of ACL entry '%s/%u' is not zero!", a, e.bits);
#ifdef HAVE_IPV6
} else if (inet_pton(AF_INET6, a, &e.address_ipv6) > 0) {
e.bits = bits == (uint32_t) -1 ? 128 : (int) bits;
if (e.bits > 128) {
pa_log_warn("Number of bits out of range: %i", e.bits);
goto fail;
}
e.family = AF_INET6;
if (e.bits < 128) {
int t = 0, i;
for (i = 0, bits = (uint32_t) e.bits; i < 16; i++) {
if (bits >= 8)
bits -= 8;
else {
if ((uint8_t) ((e.address_ipv6.s6_addr[i]) << bits) != 0) {
t = 1;
break;
}
bits = 0;
}
}
if (t)
pa_log_warn("Host part of ACL entry '%s/%u' is not zero!", a, e.bits);
}
#endif
} else {
pa_log_warn("Failed to parse address: %s", a);
goto fail;
}
n = pa_xmemdup(&e, sizeof(struct acl_entry));
PA_LLIST_PREPEND(struct acl_entry, acl->entries, n);
pa_xfree(a);
}
return acl;
fail:
pa_xfree(a);
pa_ip_acl_free(acl);
return NULL;
}
void pa_ip_acl_free(pa_ip_acl *acl) {
pa_assert(acl);
while (acl->entries) {
struct acl_entry *e = acl->entries;
PA_LLIST_REMOVE(struct acl_entry, acl->entries, e);
pa_xfree(e);
}
pa_xfree(acl);
}
int pa_ip_acl_check(pa_ip_acl *acl, int fd) {
struct sockaddr_storage sa;
struct acl_entry *e;
socklen_t salen;
pa_assert(acl);
pa_assert(fd >= 0);
salen = sizeof(sa);
if (getpeername(fd, (struct sockaddr*) &sa, &salen) < 0)
return -1;
#ifdef HAVE_IPV6
if (sa.ss_family != AF_INET && sa.ss_family != AF_INET6)
#else
if (sa.ss_family != AF_INET)
#endif
return -1;
if (sa.ss_family == AF_INET && salen != sizeof(struct sockaddr_in))
return -1;
#ifdef HAVE_IPV6
if (sa.ss_family == AF_INET6 && salen != sizeof(struct sockaddr_in6))
return -1;
#endif
for (e = acl->entries; e; e = e->next) {
if (e->family != sa.ss_family)
continue;
if (e->family == AF_INET) {
struct sockaddr_in *sai = (struct sockaddr_in*) &sa;
if (e->bits == 0 || /* this needs special handling because >> takes the right-hand side modulo 32 */
(ntohl(sai->sin_addr.s_addr ^ e->address_ipv4.s_addr) >> (32 - e->bits)) == 0)
return 1;
#ifdef HAVE_IPV6
} else if (e->family == AF_INET6) {
int i, bits;
struct sockaddr_in6 *sai = (struct sockaddr_in6*) &sa;
if (e->bits == 128)
return memcmp(&sai->sin6_addr, &e->address_ipv6, 16) == 0;
if (e->bits == 0)
return 1;
for (i = 0, bits = e->bits; i < 16; i++) {
if (bits >= 8) {
if (sai->sin6_addr.s6_addr[i] != e->address_ipv6.s6_addr[i])
break;
bits -= 8;
} else {
if ((sai->sin6_addr.s6_addr[i] ^ e->address_ipv6.s6_addr[i]) >> (8 - bits) != 0)
break;
bits = 0;
}
if (bits == 0)
return 1;
}
#endif
}
}
return 0;
}
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