760 lines
24 KiB
C
760 lines
24 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <net/if.h>
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#include <sys/types.h>
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#include <stddef.h>
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#include <netdb.h>
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#include "macro.h"
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#include "path-util.h"
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#include "util.h"
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#include "socket-util.h"
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#include "missing.h"
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#include "fileio.h"
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int socket_address_parse(SocketAddress *a, const char *s) {
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char *e, *n;
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unsigned u;
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int r;
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assert(a);
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assert(s);
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zero(*a);
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a->type = SOCK_STREAM;
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if (*s == '[') {
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/* IPv6 in [x:.....:z]:p notation */
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if (!socket_ipv6_is_supported()) {
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log_warning("Binding to IPv6 address not available since kernel does not support IPv6.");
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return -EAFNOSUPPORT;
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}
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e = strchr(s+1, ']');
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if (!e)
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return -EINVAL;
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n = strndupa(s+1, e-s-1);
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errno = 0;
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if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0)
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return errno > 0 ? -errno : -EINVAL;
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e++;
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if (*e != ':')
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return -EINVAL;
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e++;
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r = safe_atou(e, &u);
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if (r < 0)
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return r;
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if (u <= 0 || u > 0xFFFF)
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return -EINVAL;
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a->sockaddr.in6.sin6_family = AF_INET6;
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a->sockaddr.in6.sin6_port = htons((uint16_t) u);
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a->size = sizeof(struct sockaddr_in6);
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} else if (*s == '/') {
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/* AF_UNIX socket */
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size_t l;
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l = strlen(s);
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if (l >= sizeof(a->sockaddr.un.sun_path))
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return -EINVAL;
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a->sockaddr.un.sun_family = AF_UNIX;
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memcpy(a->sockaddr.un.sun_path, s, l);
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a->size = offsetof(struct sockaddr_un, sun_path) + l + 1;
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} else if (*s == '@') {
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/* Abstract AF_UNIX socket */
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size_t l;
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l = strlen(s+1);
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if (l >= sizeof(a->sockaddr.un.sun_path) - 1)
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return -EINVAL;
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a->sockaddr.un.sun_family = AF_UNIX;
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memcpy(a->sockaddr.un.sun_path+1, s+1, l);
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a->size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
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} else {
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e = strchr(s, ':');
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if (e) {
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r = safe_atou(e+1, &u);
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if (r < 0)
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return r;
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if (u <= 0 || u > 0xFFFF)
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return -EINVAL;
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n = strndupa(s, e-s);
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/* IPv4 in w.x.y.z:p notation? */
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r = inet_pton(AF_INET, n, &a->sockaddr.in.sin_addr);
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if (r < 0)
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return -errno;
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if (r > 0) {
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/* Gotcha, it's a traditional IPv4 address */
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a->sockaddr.in.sin_family = AF_INET;
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a->sockaddr.in.sin_port = htons((uint16_t) u);
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a->size = sizeof(struct sockaddr_in);
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} else {
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unsigned idx;
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if (strlen(n) > IF_NAMESIZE-1)
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return -EINVAL;
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/* Uh, our last resort, an interface name */
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idx = if_nametoindex(n);
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if (idx == 0)
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return -EINVAL;
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if (!socket_ipv6_is_supported()) {
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log_warning("Binding to interface is not available since kernel does not support IPv6.");
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return -EAFNOSUPPORT;
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}
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a->sockaddr.in6.sin6_family = AF_INET6;
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a->sockaddr.in6.sin6_port = htons((uint16_t) u);
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a->sockaddr.in6.sin6_scope_id = idx;
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a->sockaddr.in6.sin6_addr = in6addr_any;
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a->size = sizeof(struct sockaddr_in6);
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}
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} else {
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/* Just a port */
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r = safe_atou(s, &u);
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if (r < 0)
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return r;
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if (u <= 0 || u > 0xFFFF)
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return -EINVAL;
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if (socket_ipv6_is_supported()) {
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a->sockaddr.in6.sin6_family = AF_INET6;
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a->sockaddr.in6.sin6_port = htons((uint16_t) u);
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a->sockaddr.in6.sin6_addr = in6addr_any;
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a->size = sizeof(struct sockaddr_in6);
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} else {
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a->sockaddr.in.sin_family = AF_INET;
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a->sockaddr.in.sin_port = htons((uint16_t) u);
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a->sockaddr.in.sin_addr.s_addr = INADDR_ANY;
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a->size = sizeof(struct sockaddr_in);
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}
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}
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}
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return 0;
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}
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int socket_address_parse_netlink(SocketAddress *a, const char *s) {
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int family;
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unsigned group = 0;
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_cleanup_free_ char *sfamily = NULL;
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assert(a);
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assert(s);
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zero(*a);
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a->type = SOCK_RAW;
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errno = 0;
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if (sscanf(s, "%ms %u", &sfamily, &group) < 1)
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return errno > 0 ? -errno : -EINVAL;
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family = netlink_family_from_string(sfamily);
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if (family < 0)
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return -EINVAL;
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a->sockaddr.nl.nl_family = AF_NETLINK;
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a->sockaddr.nl.nl_groups = group;
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a->type = SOCK_RAW;
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a->size = sizeof(struct sockaddr_nl);
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a->protocol = family;
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return 0;
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}
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int socket_address_verify(const SocketAddress *a) {
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assert(a);
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switch (socket_address_family(a)) {
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case AF_INET:
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if (a->size != sizeof(struct sockaddr_in))
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return -EINVAL;
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if (a->sockaddr.in.sin_port == 0)
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return -EINVAL;
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if (a->type != SOCK_STREAM && a->type != SOCK_DGRAM)
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return -EINVAL;
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return 0;
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case AF_INET6:
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if (a->size != sizeof(struct sockaddr_in6))
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return -EINVAL;
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if (a->sockaddr.in6.sin6_port == 0)
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return -EINVAL;
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if (a->type != SOCK_STREAM && a->type != SOCK_DGRAM)
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return -EINVAL;
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return 0;
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case AF_UNIX:
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if (a->size < offsetof(struct sockaddr_un, sun_path))
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return -EINVAL;
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if (a->size > offsetof(struct sockaddr_un, sun_path)) {
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if (a->sockaddr.un.sun_path[0] != 0) {
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char *e;
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/* path */
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e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path));
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if (!e)
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return -EINVAL;
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if (a->size != offsetof(struct sockaddr_un, sun_path) + (e - a->sockaddr.un.sun_path) + 1)
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return -EINVAL;
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}
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}
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if (a->type != SOCK_STREAM && a->type != SOCK_DGRAM && a->type != SOCK_SEQPACKET)
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return -EINVAL;
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return 0;
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case AF_NETLINK:
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if (a->size != sizeof(struct sockaddr_nl))
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return -EINVAL;
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if (a->type != SOCK_RAW && a->type != SOCK_DGRAM)
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return -EINVAL;
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return 0;
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default:
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return -EAFNOSUPPORT;
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}
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}
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int socket_address_print(const SocketAddress *a, char **ret) {
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int r;
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assert(a);
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assert(ret);
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r = socket_address_verify(a);
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if (r < 0)
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return r;
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if (socket_address_family(a) == AF_NETLINK) {
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_cleanup_free_ char *sfamily = NULL;
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r = netlink_family_to_string_alloc(a->protocol, &sfamily);
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if (r < 0)
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return r;
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r = asprintf(ret, "%s %u", sfamily, a->sockaddr.nl.nl_groups);
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if (r < 0)
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return -ENOMEM;
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return 0;
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}
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return sockaddr_pretty(&a->sockaddr.sa, a->size, false, true, ret);
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}
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bool socket_address_can_accept(const SocketAddress *a) {
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assert(a);
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return
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a->type == SOCK_STREAM ||
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a->type == SOCK_SEQPACKET;
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}
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bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) {
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assert(a);
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assert(b);
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/* Invalid addresses are unequal to all */
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if (socket_address_verify(a) < 0 ||
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socket_address_verify(b) < 0)
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return false;
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if (a->type != b->type)
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return false;
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if (socket_address_family(a) != socket_address_family(b))
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return false;
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switch (socket_address_family(a)) {
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case AF_INET:
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if (a->sockaddr.in.sin_addr.s_addr != b->sockaddr.in.sin_addr.s_addr)
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return false;
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if (a->sockaddr.in.sin_port != b->sockaddr.in.sin_port)
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return false;
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break;
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case AF_INET6:
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if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0)
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return false;
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if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port)
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return false;
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break;
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case AF_UNIX:
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if (a->size <= offsetof(struct sockaddr_un, sun_path) ||
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b->size <= offsetof(struct sockaddr_un, sun_path))
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return false;
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if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0))
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return false;
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if (a->sockaddr.un.sun_path[0]) {
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if (!path_equal_or_files_same(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path))
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return false;
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} else {
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if (a->size != b->size)
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return false;
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if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, a->size) != 0)
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return false;
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}
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break;
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case AF_NETLINK:
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if (a->protocol != b->protocol)
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return false;
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if (a->sockaddr.nl.nl_groups != b->sockaddr.nl.nl_groups)
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return false;
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break;
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default:
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/* Cannot compare, so we assume the addresses are different */
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return false;
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}
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return true;
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}
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bool socket_address_is(const SocketAddress *a, const char *s, int type) {
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struct SocketAddress b;
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assert(a);
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assert(s);
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if (socket_address_parse(&b, s) < 0)
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return false;
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b.type = type;
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return socket_address_equal(a, &b);
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}
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bool socket_address_is_netlink(const SocketAddress *a, const char *s) {
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struct SocketAddress b;
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assert(a);
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assert(s);
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if (socket_address_parse_netlink(&b, s) < 0)
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return false;
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return socket_address_equal(a, &b);
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}
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const char* socket_address_get_path(const SocketAddress *a) {
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assert(a);
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if (socket_address_family(a) != AF_UNIX)
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return NULL;
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if (a->sockaddr.un.sun_path[0] == 0)
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return NULL;
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return a->sockaddr.un.sun_path;
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}
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bool socket_ipv6_is_supported(void) {
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_cleanup_free_ char *l = NULL;
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if (access("/sys/module/ipv6", F_OK) != 0)
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return false;
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/* If we can't check "disable" parameter, assume enabled */
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if (read_one_line_file("/sys/module/ipv6/parameters/disable", &l) < 0)
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return true;
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/* If module was loaded with disable=1 no IPv6 available */
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return l[0] == '0';
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}
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bool socket_address_matches_fd(const SocketAddress *a, int fd) {
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SocketAddress b;
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socklen_t solen;
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assert(a);
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assert(fd >= 0);
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b.size = sizeof(b.sockaddr);
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if (getsockname(fd, &b.sockaddr.sa, &b.size) < 0)
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return false;
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if (b.sockaddr.sa.sa_family != a->sockaddr.sa.sa_family)
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return false;
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solen = sizeof(b.type);
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if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &b.type, &solen) < 0)
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return false;
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if (b.type != a->type)
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return false;
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if (a->protocol != 0) {
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solen = sizeof(b.protocol);
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if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &b.protocol, &solen) < 0)
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return false;
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if (b.protocol != a->protocol)
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return false;
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}
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return socket_address_equal(a, &b);
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}
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int sockaddr_port(const struct sockaddr *_sa) {
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union sockaddr_union *sa = (union sockaddr_union*) _sa;
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assert(sa);
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if (!IN_SET(sa->sa.sa_family, AF_INET, AF_INET6))
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return -EAFNOSUPPORT;
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return ntohs(sa->sa.sa_family == AF_INET6 ?
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sa->in6.sin6_port :
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sa->in.sin_port);
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}
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int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, bool include_port, char **ret) {
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union sockaddr_union *sa = (union sockaddr_union*) _sa;
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char *p;
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assert(sa);
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assert(salen >= sizeof(sa->sa.sa_family));
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switch (sa->sa.sa_family) {
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case AF_INET: {
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uint32_t a;
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a = ntohl(sa->in.sin_addr.s_addr);
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if (include_port) {
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if (asprintf(&p,
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"%u.%u.%u.%u:%u",
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a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
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ntohs(sa->in.sin_port)) < 0)
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return -ENOMEM;
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} else {
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if (asprintf(&p,
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"%u.%u.%u.%u",
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a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF) < 0)
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return -ENOMEM;
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}
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break;
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}
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case AF_INET6: {
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static const unsigned char ipv4_prefix[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF
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};
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if (translate_ipv6 && memcmp(&sa->in6.sin6_addr, ipv4_prefix, sizeof(ipv4_prefix)) == 0) {
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const uint8_t *a = sa->in6.sin6_addr.s6_addr+12;
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if (include_port) {
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if (asprintf(&p,
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"%u.%u.%u.%u:%u",
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a[0], a[1], a[2], a[3],
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ntohs(sa->in6.sin6_port)) < 0)
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return -ENOMEM;
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} else {
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if (asprintf(&p,
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"%u.%u.%u.%u",
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a[0], a[1], a[2], a[3]) < 0)
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return -ENOMEM;
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}
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} else {
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char a[INET6_ADDRSTRLEN];
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inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a));
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if (include_port) {
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if (asprintf(&p,
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"[%s]:%u",
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a,
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ntohs(sa->in6.sin6_port)) < 0)
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return -ENOMEM;
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} else {
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p = strdup(a);
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if (!p)
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return -ENOMEM;
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}
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}
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break;
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}
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|
|
case AF_UNIX:
|
|
if (salen <= offsetof(struct sockaddr_un, sun_path)) {
|
|
p = strdup("<unnamed>");
|
|
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 = sizeof(sa);
|
|
int r;
|
|
|
|
assert(fd >= 0);
|
|
assert(ret);
|
|
|
|
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, true, ret);
|
|
}
|
|
|
|
int getsockname_pretty(int fd, char **ret) {
|
|
union sockaddr_union sa;
|
|
socklen_t salen = sizeof(sa);
|
|
|
|
assert(fd >= 0);
|
|
assert(ret);
|
|
|
|
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, true, ret);
|
|
}
|
|
|
|
int socknameinfo_pretty(union sockaddr_union *sa, socklen_t salen, char **_ret) {
|
|
int r;
|
|
char host[NI_MAXHOST], *ret;
|
|
|
|
assert(_ret);
|
|
|
|
r = getnameinfo(&sa->sa, salen, host, sizeof(host), NULL, 0,
|
|
NI_IDN|NI_IDN_USE_STD3_ASCII_RULES);
|
|
if (r != 0) {
|
|
int saved_errno = errno;
|
|
|
|
r = sockaddr_pretty(&sa->sa, salen, true, true, &ret);
|
|
if (r < 0)
|
|
return log_error_errno(r, "sockadd_pretty() failed: %m");
|
|
|
|
log_debug_errno(saved_errno, "getnameinfo(%s) failed: %m", ret);
|
|
} else {
|
|
ret = strdup(host);
|
|
if (!ret)
|
|
return log_oom();
|
|
}
|
|
|
|
*_ret = ret;
|
|
return 0;
|
|
}
|
|
|
|
int getnameinfo_pretty(int fd, char **ret) {
|
|
union sockaddr_union sa;
|
|
socklen_t salen = sizeof(sa);
|
|
|
|
assert(fd >= 0);
|
|
assert(ret);
|
|
|
|
if (getsockname(fd, &sa.sa, &salen) < 0)
|
|
return log_error_errno(errno, "getsockname(%d) failed: %m", fd);
|
|
|
|
return socknameinfo_pretty(&sa, salen, 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;
|
|
}
|
|
|
|
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);
|
|
|
|
bool sockaddr_equal(const union sockaddr_union *a, const union sockaddr_union *b) {
|
|
assert(a);
|
|
assert(b);
|
|
|
|
if (a->sa.sa_family != b->sa.sa_family)
|
|
return false;
|
|
|
|
if (a->sa.sa_family == AF_INET)
|
|
return a->in.sin_addr.s_addr == b->in.sin_addr.s_addr;
|
|
|
|
if (a->sa.sa_family == AF_INET6)
|
|
return memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr)) == 0;
|
|
|
|
return false;
|
|
}
|
|
|
|
char* ether_addr_to_string(const struct ether_addr *addr, char buffer[ETHER_ADDR_TO_STRING_MAX]) {
|
|
assert(addr);
|
|
assert(buffer);
|
|
|
|
/* Like ether_ntoa() but uses %02x instead of %x to print
|
|
* ethernet addresses, which makes them look less funny. Also,
|
|
* doesn't use a static buffer. */
|
|
|
|
sprintf(buffer, "%02x:%02x:%02x:%02x:%02x:%02x",
|
|
addr->ether_addr_octet[0],
|
|
addr->ether_addr_octet[1],
|
|
addr->ether_addr_octet[2],
|
|
addr->ether_addr_octet[3],
|
|
addr->ether_addr_octet[4],
|
|
addr->ether_addr_octet[5]);
|
|
|
|
return buffer;
|
|
}
|