/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd 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.
systemd 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 systemd; If not, see .
***/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "macro.h"
#include "util.h"
#include "mkdir.h"
#include "path-util.h"
#include "socket-util.h"
#include "missing.h"
#include "fileio.h"
int socket_address_parse(SocketAddress *a, const char *s) {
char *e, *n;
unsigned u;
int r;
assert(a);
assert(s);
zero(*a);
a->type = SOCK_STREAM;
if (*s == '[') {
/* IPv6 in [x:.....:z]:p notation */
if (!socket_ipv6_is_supported()) {
log_warning("Binding to IPv6 address not available since kernel does not support IPv6.");
return -EAFNOSUPPORT;
}
e = strchr(s+1, ']');
if (!e)
return -EINVAL;
n = strndupa(s+1, e-s-1);
errno = 0;
if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0)
return errno > 0 ? -errno : -EINVAL;
e++;
if (*e != ':')
return -EINVAL;
e++;
r = safe_atou(e, &u);
if (r < 0)
return r;
if (u <= 0 || u > 0xFFFF)
return -EINVAL;
a->sockaddr.in6.sin6_family = AF_INET6;
a->sockaddr.in6.sin6_port = htons((uint16_t) u);
a->size = sizeof(struct sockaddr_in6);
} else if (*s == '/') {
/* AF_UNIX socket */
size_t l;
l = strlen(s);
if (l >= sizeof(a->sockaddr.un.sun_path))
return -EINVAL;
a->sockaddr.un.sun_family = AF_UNIX;
memcpy(a->sockaddr.un.sun_path, s, l);
a->size = offsetof(struct sockaddr_un, sun_path) + l + 1;
} else if (*s == '@') {
/* Abstract AF_UNIX socket */
size_t l;
l = strlen(s+1);
if (l >= sizeof(a->sockaddr.un.sun_path) - 1)
return -EINVAL;
a->sockaddr.un.sun_family = AF_UNIX;
memcpy(a->sockaddr.un.sun_path+1, s+1, l);
a->size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
} else {
e = strchr(s, ':');
if (e) {
r = safe_atou(e+1, &u);
if (r < 0)
return r;
if (u <= 0 || u > 0xFFFF)
return -EINVAL;
n = strndupa(s, e-s);
/* IPv4 in w.x.y.z:p notation? */
r = inet_pton(AF_INET, n, &a->sockaddr.in.sin_addr);
if (r < 0)
return -errno;
if (r > 0) {
/* Gotcha, it's a traditional IPv4 address */
a->sockaddr.in.sin_family = AF_INET;
a->sockaddr.in.sin_port = htons((uint16_t) u);
a->size = sizeof(struct sockaddr_in);
} else {
unsigned idx;
if (strlen(n) > IF_NAMESIZE-1)
return -EINVAL;
/* Uh, our last resort, an interface name */
idx = if_nametoindex(n);
if (idx == 0)
return -EINVAL;
if (!socket_ipv6_is_supported()) {
log_warning("Binding to interface is not available since kernel does not support IPv6.");
return -EAFNOSUPPORT;
}
a->sockaddr.in6.sin6_family = AF_INET6;
a->sockaddr.in6.sin6_port = htons((uint16_t) u);
a->sockaddr.in6.sin6_scope_id = idx;
a->sockaddr.in6.sin6_addr = in6addr_any;
a->size = sizeof(struct sockaddr_in6);
}
} else {
/* Just a port */
r = safe_atou(s, &u);
if (r < 0)
return r;
if (u <= 0 || u > 0xFFFF)
return -EINVAL;
if (socket_ipv6_is_supported()) {
a->sockaddr.in6.sin6_family = AF_INET6;
a->sockaddr.in6.sin6_port = htons((uint16_t) u);
a->sockaddr.in6.sin6_addr = in6addr_any;
a->size = sizeof(struct sockaddr_in6);
} else {
a->sockaddr.in.sin_family = AF_INET;
a->sockaddr.in.sin_port = htons((uint16_t) u);
a->sockaddr.in.sin_addr.s_addr = INADDR_ANY;
a->size = sizeof(struct sockaddr_in);
}
}
}
return 0;
}
int socket_address_parse_netlink(SocketAddress *a, const char *s) {
int family;
unsigned group = 0;
_cleanup_free_ char *sfamily = NULL;
assert(a);
assert(s);
zero(*a);
a->type = SOCK_RAW;
errno = 0;
if (sscanf(s, "%ms %u", &sfamily, &group) < 1)
return errno > 0 ? -errno : -EINVAL;
family = netlink_family_from_string(sfamily);
if (family < 0)
return -EINVAL;
a->sockaddr.nl.nl_family = AF_NETLINK;
a->sockaddr.nl.nl_groups = group;
a->type = SOCK_RAW;
a->size = sizeof(struct sockaddr_nl);
a->protocol = family;
return 0;
}
int socket_address_verify(const SocketAddress *a) {
assert(a);
switch (socket_address_family(a)) {
case AF_INET:
if (a->size != sizeof(struct sockaddr_in))
return -EINVAL;
if (a->sockaddr.in.sin_port == 0)
return -EINVAL;
if (a->type != SOCK_STREAM && a->type != SOCK_DGRAM)
return -EINVAL;
return 0;
case AF_INET6:
if (a->size != sizeof(struct sockaddr_in6))
return -EINVAL;
if (a->sockaddr.in6.sin6_port == 0)
return -EINVAL;
if (a->type != SOCK_STREAM && a->type != SOCK_DGRAM)
return -EINVAL;
return 0;
case AF_UNIX:
if (a->size < offsetof(struct sockaddr_un, sun_path))
return -EINVAL;
if (a->size > offsetof(struct sockaddr_un, sun_path)) {
if (a->sockaddr.un.sun_path[0] != 0) {
char *e;
/* path */
e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path));
if (!e)
return -EINVAL;
if (a->size != offsetof(struct sockaddr_un, sun_path) + (e - a->sockaddr.un.sun_path) + 1)
return -EINVAL;
}
}
if (a->type != SOCK_STREAM && a->type != SOCK_DGRAM && a->type != SOCK_SEQPACKET)
return -EINVAL;
return 0;
case AF_NETLINK:
if (a->size != sizeof(struct sockaddr_nl))
return -EINVAL;
if (a->type != SOCK_RAW && a->type != SOCK_DGRAM)
return -EINVAL;
return 0;
default:
return -EAFNOSUPPORT;
}
}
int socket_address_print(const SocketAddress *a, char **ret) {
int r;
assert(a);
assert(ret);
r = socket_address_verify(a);
if (r < 0)
return r;
if (socket_address_family(a) == AF_NETLINK) {
_cleanup_free_ char *sfamily = NULL;
r = netlink_family_to_string_alloc(a->protocol, &sfamily);
if (r < 0)
return r;
r = asprintf(ret, "%s %u", sfamily, a->sockaddr.nl.nl_groups);
if (r < 0)
return -ENOMEM;
return 0;
}
return sockaddr_pretty(&a->sockaddr.sa, a->size, false, ret);
}
bool socket_address_can_accept(const SocketAddress *a) {
assert(a);
return
a->type == SOCK_STREAM ||
a->type == SOCK_SEQPACKET;
}
bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) {
assert(a);
assert(b);
/* Invalid addresses are unequal to all */
if (socket_address_verify(a) < 0 ||
socket_address_verify(b) < 0)
return false;
if (a->type != b->type)
return false;
if (a->size != b->size)
return false;
if (socket_address_family(a) != socket_address_family(b))
return false;
switch (socket_address_family(a)) {
case AF_INET:
if (a->sockaddr.in.sin_addr.s_addr != b->sockaddr.in.sin_addr.s_addr)
return false;
if (a->sockaddr.in.sin_port != b->sockaddr.in.sin_port)
return false;
break;
case AF_INET6:
if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0)
return false;
if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port)
return false;
break;
case AF_UNIX:
if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0))
return false;
if (a->sockaddr.un.sun_path[0]) {
if (!strneq(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, sizeof(a->sockaddr.un.sun_path)))
return false;
} else {
if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, a->size) != 0)
return false;
}
break;
case AF_NETLINK:
if (a->protocol != b->protocol)
return false;
if (a->sockaddr.nl.nl_groups != b->sockaddr.nl.nl_groups)
return false;
break;
default:
/* Cannot compare, so we assume the addresses are different */
return false;
}
return true;
}
bool socket_address_is(const SocketAddress *a, const char *s, int type) {
struct SocketAddress b;
assert(a);
assert(s);
if (socket_address_parse(&b, s) < 0)
return false;
b.type = type;
return socket_address_equal(a, &b);
}
bool socket_address_is_netlink(const SocketAddress *a, const char *s) {
struct SocketAddress b;
assert(a);
assert(s);
if (socket_address_parse_netlink(&b, s) < 0)
return false;
return socket_address_equal(a, &b);
}
const char* socket_address_get_path(const SocketAddress *a) {
assert(a);
if (socket_address_family(a) != AF_UNIX)
return NULL;
if (a->sockaddr.un.sun_path[0] == 0)
return NULL;
return a->sockaddr.un.sun_path;
}
bool socket_ipv6_is_supported(void) {
_cleanup_free_ char *l = NULL;
if (access("/sys/module/ipv6", F_OK) != 0)
return 0;
/* If we can't check "disable" parameter, assume enabled */
if (read_one_line_file("/sys/module/ipv6/parameters/disable", &l) < 0)
return 1;
/* If module was loaded with disable=1 no IPv6 available */
return l[0] == '0';
}
bool socket_address_matches_fd(const SocketAddress *a, int fd) {
union sockaddr_union sa;
socklen_t salen = sizeof(sa), solen;
int protocol, type;
assert(a);
assert(fd >= 0);
if (getsockname(fd, &sa.sa, &salen) < 0)
return false;
if (sa.sa.sa_family != a->sockaddr.sa.sa_family)
return false;
solen = sizeof(type);
if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &solen) < 0)
return false;
if (type != a->type)
return false;
if (a->protocol != 0) {
solen = sizeof(protocol);
if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &protocol, &solen) < 0)
return false;
if (protocol != a->protocol)
return false;
}
switch (sa.sa.sa_family) {
case AF_INET:
return sa.in.sin_port == a->sockaddr.in.sin_port &&
sa.in.sin_addr.s_addr == a->sockaddr.in.sin_addr.s_addr;
case AF_INET6:
return sa.in6.sin6_port == a->sockaddr.in6.sin6_port &&
memcmp(&sa.in6.sin6_addr, &a->sockaddr.in6.sin6_addr, sizeof(struct in6_addr)) == 0;
case AF_UNIX:
return salen == a->size &&
memcmp(sa.un.sun_path, a->sockaddr.un.sun_path, salen - offsetof(struct sockaddr_un, sun_path)) == 0;
}
return false;
}
int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, char **ret) {
union sockaddr_union *sa = (union sockaddr_union*) _sa;
char *p;
assert(sa);
assert(salen >= sizeof(sa->sa.sa_family));
switch (sa->sa.sa_family) {
case AF_INET: {
uint32_t a;
a = ntohl(sa->in.sin_addr.s_addr);
if (asprintf(&p,
"%u.%u.%u.%u:%u",
a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
ntohs(sa->in.sin_port)) < 0)
return -ENOMEM;
break;
}
case AF_INET6: {
static const unsigned char ipv4_prefix[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
};
if (translate_ipv6 && memcmp(&sa->in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
const uint8_t *a = sa->in6.sin6_addr.s6_addr+12;
if (asprintf(&p,
"%u.%u.%u.%u:%u",
a[0], a[1], a[2], a[3],
ntohs(sa->in6.sin6_port)) < 0)
return -ENOMEM;
} else {
char a[INET6_ADDRSTRLEN];
if (asprintf(&p,
"[%s]:%u",
inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a)),
ntohs(sa->in6.sin6_port)) < 0)
return -ENOMEM;
}
break;
}
case AF_UNIX:
if (salen <= offsetof(struct sockaddr_un, sun_path)) {
p = strdup("");
if (!p)
return -ENOMEM;
} else if (sa->un.sun_path[0] == 0) {
/* abstract */
/* FIXME: We assume we can print the
* socket path here and that it hasn't
* more than one NUL byte. That is
* actually an invalid assumption */
p = new(char, sizeof(sa->un.sun_path)+1);
if (!p)
return -ENOMEM;
p[0] = '@';
memcpy(p+1, sa->un.sun_path+1, sizeof(sa->un.sun_path)-1);
p[sizeof(sa->un.sun_path)] = 0;
} else {
p = strndup(sa->un.sun_path, sizeof(sa->un.sun_path));
if (!ret)
return -ENOMEM;
}
break;
default:
return -ENOTSUP;
}
*ret = p;
return 0;
}
int getpeername_pretty(int fd, char **ret) {
union sockaddr_union sa;
socklen_t salen;
int r;
assert(fd >= 0);
assert(ret);
salen = sizeof(sa);
if (getpeername(fd, &sa.sa, &salen) < 0)
return -errno;
if (sa.sa.sa_family == AF_UNIX) {
struct ucred ucred = {};
/* UNIX connection sockets are anonymous, so let's use
* PID/UID as pretty credentials instead */
r = getpeercred(fd, &ucred);
if (r < 0)
return r;
if (asprintf(ret, "PID "PID_FMT"/UID "UID_FMT, ucred.pid, ucred.uid) < 0)
return -ENOMEM;
return 0;
}
/* For remote sockets we translate IPv6 addresses back to IPv4
* if applicable, since that's nicer. */
return sockaddr_pretty(&sa.sa, salen, true, ret);
}
int getsockname_pretty(int fd, char **ret) {
union sockaddr_union sa;
socklen_t salen;
assert(fd >= 0);
assert(ret);
salen = sizeof(sa);
if (getsockname(fd, &sa.sa, &salen) < 0)
return -errno;
/* For local sockets we do not translate IPv6 addresses back
* to IPv6 if applicable, since this is usually used for
* listening sockets where the difference between IPv4 and
* IPv6 matters. */
return sockaddr_pretty(&sa.sa, salen, false, ret);
}
int socket_address_unlink(SocketAddress *a) {
assert(a);
if (socket_address_family(a) != AF_UNIX)
return 0;
if (a->sockaddr.un.sun_path[0] == 0)
return 0;
if (unlink(a->sockaddr.un.sun_path) < 0)
return -errno;
return 1;
}
int in_addr_null(unsigned family, union in_addr_union *u) {
assert(u);
if (family == AF_INET)
return u->in.s_addr == 0;
if (family == AF_INET6)
return
u->in6.s6_addr32[0] == 0 &&
u->in6.s6_addr32[1] == 0 &&
u->in6.s6_addr32[2] == 0 &&
u->in6.s6_addr32[3] == 0;
return -EAFNOSUPPORT;
}
int in_addr_equal(unsigned family, union in_addr_union *a, union in_addr_union *b) {
assert(a);
assert(b);
if (family == AF_INET)
return a->in.s_addr == b->in.s_addr;
if (family == AF_INET6)
return
a->in6.s6_addr32[0] == b->in6.s6_addr32[0] &&
a->in6.s6_addr32[1] == b->in6.s6_addr32[1] &&
a->in6.s6_addr32[2] == b->in6.s6_addr32[2] &&
a->in6.s6_addr32[3] == b->in6.s6_addr32[3];
return -EAFNOSUPPORT;
}
int in_addr_prefix_intersect(
unsigned family,
const union in_addr_union *a,
unsigned aprefixlen,
const union in_addr_union *b,
unsigned bprefixlen) {
unsigned m;
assert(a);
assert(b);
/* Checks whether there are any addresses that are in both
* networks */
m = MIN(aprefixlen, bprefixlen);
if (family == AF_INET) {
uint32_t x, nm;
x = be32toh(a->in.s_addr ^ b->in.s_addr);
nm = (m == 0) ? 0 : 0xFFFFFFFFUL << (32 - m);
return (x & nm) == 0;
}
if (family == AF_INET6) {
unsigned i;
if (m > 128)
m = 128;
for (i = 0; i < 16; i++) {
uint8_t x, nm;
x = a->in6.s6_addr[i] ^ b->in6.s6_addr[i];
if (m < 8)
nm = 0xFF << (8 - m);
else
nm = 0xFF;
if ((x & nm) != 0)
return 0;
if (m > 8)
m -= 8;
else
m = 0;
}
return 1;
}
return -EAFNOSUPPORT;
}
int in_addr_prefix_next(unsigned family, union in_addr_union *u, unsigned prefixlen) {
assert(u);
/* Increases the network part of an address by one. Returns
* positive it that succeeds, or 0 if this overflows. */
if (prefixlen <= 0)
return 0;
if (family == AF_INET) {
uint32_t c, n;
if (prefixlen > 32)
prefixlen = 32;
c = be32toh(u->in.s_addr);
n = c + (1UL << (32 - prefixlen));
if (n < c)
return 0;
n &= 0xFFFFFFFFUL << (32 - prefixlen);
u->in.s_addr = htobe32(n);
return 1;
}
if (family == AF_INET6) {
struct in6_addr add = {}, result;
uint8_t overflow = 0;
unsigned i;
if (prefixlen > 128)
prefixlen = 128;
/* First calculate what we have to add */
add.s6_addr[(prefixlen-1) / 8] = 1 << (7 - (prefixlen-1) % 8);
for (i = 16; i > 0; i--) {
unsigned j = i - 1;
result.s6_addr[j] = u->in6.s6_addr[j] + add.s6_addr[j] + overflow;
overflow = (result.s6_addr[j] < u->in6.s6_addr[j]);
}
if (overflow)
return 0;
u->in6 = result;
return 1;
}
return -EAFNOSUPPORT;
}
int in_addr_to_string(unsigned family, const union in_addr_union *u, char **ret) {
char *x;
size_t l;
assert(u);
assert(ret);
if (family == AF_INET)
l = INET_ADDRSTRLEN;
else if (family == AF_INET6)
l = INET6_ADDRSTRLEN;
else
return -EAFNOSUPPORT;
x = new(char, l);
if (!x)
return -ENOMEM;
errno = 0;
if (!inet_ntop(family, u, x, l)) {
free(x);
return errno ? -errno : -EINVAL;
}
*ret = x;
return 0;
}
int in_addr_from_string(unsigned family, const char *s, union in_addr_union *ret) {
assert(s);
assert(ret);
if (!IN_SET(family, AF_INET, AF_INET6))
return -EAFNOSUPPORT;
errno = 0;
if (inet_pton(family, s, ret) <= 0)
return errno ? -errno : -EINVAL;
return 0;
}
static const char* const netlink_family_table[] = {
[NETLINK_ROUTE] = "route",
[NETLINK_FIREWALL] = "firewall",
[NETLINK_INET_DIAG] = "inet-diag",
[NETLINK_NFLOG] = "nflog",
[NETLINK_XFRM] = "xfrm",
[NETLINK_SELINUX] = "selinux",
[NETLINK_ISCSI] = "iscsi",
[NETLINK_AUDIT] = "audit",
[NETLINK_FIB_LOOKUP] = "fib-lookup",
[NETLINK_CONNECTOR] = "connector",
[NETLINK_NETFILTER] = "netfilter",
[NETLINK_IP6_FW] = "ip6-fw",
[NETLINK_DNRTMSG] = "dnrtmsg",
[NETLINK_KOBJECT_UEVENT] = "kobject-uevent",
[NETLINK_GENERIC] = "generic",
[NETLINK_SCSITRANSPORT] = "scsitransport",
[NETLINK_ECRYPTFS] = "ecryptfs"
};
DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(netlink_family, int, INT_MAX);
static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = {
[SOCKET_ADDRESS_DEFAULT] = "default",
[SOCKET_ADDRESS_BOTH] = "both",
[SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only"
};
DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only);