545 lines
17 KiB
C
545 lines
17 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 <assert.h>
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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 <stdlib.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 <sys/stat.h>
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#include <stddef.h>
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#include <sys/ioctl.h>
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#include "macro.h"
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#include "util.h"
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#include "mkdir.h"
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#include "path-util.h"
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#include "socket-util.h"
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#include "missing.h"
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int socket_address_parse(SocketAddress *a, const char *s) {
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int r;
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char *e, *n;
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unsigned u;
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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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if (!(e = strchr(s+1, ']')))
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return -EINVAL;
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if (!(n = strndup(s+1, e-s-1)))
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return -ENOMEM;
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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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free(n);
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return errno != 0 ? -errno : -EINVAL;
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}
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free(n);
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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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if ((r = safe_atou(e, &u)) < 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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if ((e = strchr(s, ':'))) {
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if ((r = safe_atou(e+1, &u)) < 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 (!(n = strndup(s, e-s)))
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return -ENOMEM;
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/* IPv4 in w.x.y.z:p notation? */
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if ((r = inet_pton(AF_INET, n, &a->sockaddr.in4.sin_addr)) < 0) {
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free(n);
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return -errno;
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}
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if (r > 0) {
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/* Gotcha, it's a traditional IPv4 address */
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free(n);
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a->sockaddr.in4.sin_family = AF_INET;
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a->sockaddr.in4.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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free(n);
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return -EINVAL;
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}
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/* Uh, our last resort, an interface name */
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idx = if_nametoindex(n);
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free(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.in4.sin_family = AF_INET;
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a->sockaddr.in4.sin_port = htons((uint16_t) u);
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a->sockaddr.in4.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 ? -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.in4.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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if (!(e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path))))
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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 **p) {
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int r;
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assert(a);
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assert(p);
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if ((r = socket_address_verify(a)) < 0)
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return r;
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switch (socket_address_family(a)) {
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case AF_INET: {
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char *ret;
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if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1)))
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return -ENOMEM;
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if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) {
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free(ret);
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return -errno;
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}
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sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port));
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*p = ret;
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return 0;
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}
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case AF_INET6: {
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char *ret;
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if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1)))
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return -ENOMEM;
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ret[0] = '[';
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if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) {
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free(ret);
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return -errno;
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}
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sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port));
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*p = ret;
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return 0;
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}
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case AF_UNIX: {
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char *ret;
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if (a->size <= offsetof(struct sockaddr_un, sun_path)) {
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if (!(ret = strdup("<unnamed>")))
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return -ENOMEM;
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} else if (a->sockaddr.un.sun_path[0] == 0) {
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/* abstract */
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/* FIXME: We assume we can print the
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* socket path here and that it hasn't
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* more than one NUL byte. That is
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* actually an invalid assumption */
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if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1)))
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return -ENOMEM;
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ret[0] = '@';
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memcpy(ret+1, a->sockaddr.un.sun_path+1, sizeof(a->sockaddr.un.sun_path)-1);
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ret[sizeof(a->sockaddr.un.sun_path)] = 0;
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} else {
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if (!(ret = strdup(a->sockaddr.un.sun_path)))
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return -ENOMEM;
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}
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*p = ret;
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return 0;
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}
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case AF_NETLINK: {
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char _cleanup_free_ *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(p, "%s %u", sfamily, a->sockaddr.nl.nl_groups);
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return 0;
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}
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default:
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return -EINVAL;
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}
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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 (a->size != b->size)
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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.in4.sin_addr.s_addr != b->sockaddr.in4.sin_addr.s_addr)
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return false;
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if (a->sockaddr.in4.sin_port != b->sockaddr.in4.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->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 (strncmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, sizeof(a->sockaddr.un.sun_path)) != 0)
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return false;
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} else {
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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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bool socket_address_needs_mount(const SocketAddress *a, const char *prefix) {
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assert(a);
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if (socket_address_family(a) != AF_UNIX)
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return false;
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if (a->sockaddr.un.sun_path[0] == 0)
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return false;
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return path_startswith(a->sockaddr.un.sun_path, prefix);
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}
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bool socket_ipv6_is_supported(void) {
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char *l = 0;
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bool enabled;
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if (access("/sys/module/ipv6", F_OK) != 0)
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return 0;
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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 1;
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/* If module was loaded with disable=1 no IPv6 available */
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enabled = l[0] == '0';
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free(l);
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return enabled;
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}
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static const char* const netlink_family_table[] = {
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[NETLINK_ROUTE] = "route",
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[NETLINK_FIREWALL] = "firewall",
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[NETLINK_INET_DIAG] = "inet-diag",
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[NETLINK_NFLOG] = "nflog",
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[NETLINK_XFRM] = "xfrm",
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[NETLINK_SELINUX] = "selinux",
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[NETLINK_ISCSI] = "iscsi",
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[NETLINK_AUDIT] = "audit",
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[NETLINK_FIB_LOOKUP] = "fib-lookup",
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[NETLINK_CONNECTOR] = "connector",
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[NETLINK_NETFILTER] = "netfilter",
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[NETLINK_IP6_FW] = "ip6-fw",
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[NETLINK_DNRTMSG] = "dnrtmsg",
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[NETLINK_KOBJECT_UEVENT] = "kobject-uevent",
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[NETLINK_GENERIC] = "generic",
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[NETLINK_SCSITRANSPORT] = "scsitransport",
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[NETLINK_ECRYPTFS] = "ecryptfs"
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};
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DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(netlink_family, int, INT_MAX);
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static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = {
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[SOCKET_ADDRESS_DEFAULT] = "default",
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[SOCKET_ADDRESS_BOTH] = "both",
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[SOCKET_ADDRESS_IPV6_ONLY] = "ipv6-only"
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};
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DEFINE_STRING_TABLE_LOOKUP(socket_address_bind_ipv6_only, SocketAddressBindIPv6Only);
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