1205 lines
36 KiB
C
1205 lines
36 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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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 <arpa/inet.h>
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#include <errno.h>
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#include <limits.h>
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#include <net/if.h>
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#include <netdb.h>
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#include <netinet/ip.h>
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#include <poll.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "format-util.h"
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#include "log.h"
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#include "macro.h"
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#include "missing.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "socket-util.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "strv.h"
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#include "user-util.h"
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#include "utf8.h"
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#include "util.h"
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#if ENABLE_IDN
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# define IDN_FLAGS NI_IDN
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#else
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# define IDN_FLAGS 0
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#endif
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static const char* const socket_address_type_table[] = {
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[SOCK_STREAM] = "Stream",
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[SOCK_DGRAM] = "Datagram",
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[SOCK_RAW] = "Raw",
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[SOCK_RDM] = "ReliableDatagram",
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[SOCK_SEQPACKET] = "SequentialPacket",
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[SOCK_DCCP] = "DatagramCongestionControl",
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};
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DEFINE_STRING_TABLE_LOOKUP(socket_address_type, int);
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int socket_address_parse(SocketAddress *a, const char *s) {
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char *e, *n;
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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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uint16_t port;
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/* IPv6 in [x:.....:z]:p notation */
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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 = parse_ip_port(e, &port);
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if (r < 0)
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return r;
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a->sockaddr.in6.sin6_family = AF_INET6;
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a->sockaddr.in6.sin6_port = htobe16(port);
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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 if (startswith(s, "vsock:")) {
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/* AF_VSOCK socket in vsock:cid:port notation */
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const char *cid_start = s + STRLEN("vsock:");
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unsigned port;
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e = strchr(cid_start, ':');
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if (!e)
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return -EINVAL;
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r = safe_atou(e+1, &port);
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if (r < 0)
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return r;
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n = strndupa(cid_start, e - cid_start);
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if (!isempty(n)) {
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r = safe_atou(n, &a->sockaddr.vm.svm_cid);
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if (r < 0)
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return r;
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} else
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a->sockaddr.vm.svm_cid = VMADDR_CID_ANY;
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a->sockaddr.vm.svm_family = AF_VSOCK;
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a->sockaddr.vm.svm_port = port;
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a->size = sizeof(struct sockaddr_vm);
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} else {
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uint16_t port;
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e = strchr(s, ':');
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if (e) {
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r = parse_ip_port(e + 1, &port);
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if (r < 0)
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return r;
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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 = htobe16(port);
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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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a->sockaddr.in6.sin6_family = AF_INET6;
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a->sockaddr.in6.sin6_port = htobe16(port);
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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 = parse_ip_port(s, &port);
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if (r < 0)
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return r;
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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 = htobe16(port);
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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 = htobe16(port);
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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_and_warn(SocketAddress *a, const char *s) {
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SocketAddress b;
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int r;
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/* Similar to socket_address_parse() but warns for IPv6 sockets when we don't support them. */
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r = socket_address_parse(&b, s);
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if (r < 0)
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return r;
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if (!socket_ipv6_is_supported() && b.sockaddr.sa.sa_family == AF_INET6) {
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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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*a = b;
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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 (!IN_SET(a->type, SOCK_STREAM, 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 (!IN_SET(a->type, SOCK_STREAM, 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 (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM, 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 (!IN_SET(a->type, SOCK_RAW, SOCK_DGRAM))
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return -EINVAL;
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return 0;
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case AF_VSOCK:
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if (a->size != sizeof(struct sockaddr_vm))
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return -EINVAL;
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if (!IN_SET(a->type, SOCK_STREAM, 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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IN_SET(a->type, SOCK_STREAM, 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, 0))
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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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case AF_VSOCK:
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if (a->sockaddr.vm.svm_cid != b->sockaddr.vm.svm_cid)
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return false;
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if (a->sockaddr.vm.svm_port != b->sockaddr.vm.svm_port)
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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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if (access("/proc/net/if_inet6", F_OK) != 0)
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return false;
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return true;
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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, unsigned *ret_port) {
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union sockaddr_union *sa = (union sockaddr_union*) _sa;
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/* Note, this returns the port as 'unsigned' rather than 'uint16_t', as AF_VSOCK knows larger ports */
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assert(sa);
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switch (sa->sa.sa_family) {
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case AF_INET:
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*ret_port = be16toh(sa->in.sin_port);
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return 0;
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case AF_INET6:
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*ret_port = be16toh(sa->in6.sin6_port);
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return 0;
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|
|
case AF_VSOCK:
|
|
*ret_port = sa->vm.svm_port;
|
|
return 0;
|
|
|
|
default:
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
}
|
|
|
|
int sockaddr_pretty(const struct sockaddr *_sa, socklen_t salen, bool translate_ipv6, bool include_port, char **ret) {
|
|
union sockaddr_union *sa = (union sockaddr_union*) _sa;
|
|
char *p;
|
|
int r;
|
|
|
|
assert(sa);
|
|
assert(salen >= sizeof(sa->sa.sa_family));
|
|
|
|
switch (sa->sa.sa_family) {
|
|
|
|
case AF_INET: {
|
|
uint32_t a;
|
|
|
|
a = be32toh(sa->in.sin_addr.s_addr);
|
|
|
|
if (include_port)
|
|
r = asprintf(&p,
|
|
"%u.%u.%u.%u:%u",
|
|
a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF,
|
|
be16toh(sa->in.sin_port));
|
|
else
|
|
r = asprintf(&p,
|
|
"%u.%u.%u.%u",
|
|
a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF);
|
|
if (r < 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 (include_port)
|
|
r = asprintf(&p,
|
|
"%u.%u.%u.%u:%u",
|
|
a[0], a[1], a[2], a[3],
|
|
be16toh(sa->in6.sin6_port));
|
|
else
|
|
r = asprintf(&p,
|
|
"%u.%u.%u.%u",
|
|
a[0], a[1], a[2], a[3]);
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
} else {
|
|
char a[INET6_ADDRSTRLEN];
|
|
|
|
inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a));
|
|
|
|
if (include_port) {
|
|
r = asprintf(&p,
|
|
"[%s]:%u",
|
|
a,
|
|
be16toh(sa->in6.sin6_port));
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
} else {
|
|
p = strdup(a);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
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 (!p)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
break;
|
|
|
|
case AF_VSOCK:
|
|
if (include_port)
|
|
r = asprintf(&p,
|
|
"vsock:%u:%u",
|
|
sa->vm.svm_cid,
|
|
sa->vm.svm_port);
|
|
else
|
|
r = asprintf(&p, "vsock:%u", sa->vm.svm_cid);
|
|
if (r < 0)
|
|
return -ENOMEM;
|
|
break;
|
|
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
|
|
*ret = p;
|
|
return 0;
|
|
}
|
|
|
|
int getpeername_pretty(int fd, bool include_port, 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, include_port, 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, IDN_FLAGS);
|
|
if (r != 0) {
|
|
int saved_errno = errno;
|
|
|
|
r = sockaddr_pretty(&sa->sa, salen, true, true, &ret);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
log_debug_errno(saved_errno, "getnameinfo(%s) failed: %m", ret);
|
|
} else {
|
|
ret = strdup(host);
|
|
if (!ret)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*_ret = ret;
|
|
return 0;
|
|
}
|
|
|
|
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",
|
|
[NETLINK_RDMA] = "rdma",
|
|
};
|
|
|
|
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);
|
|
|
|
SocketAddressBindIPv6Only parse_socket_address_bind_ipv6_only_or_bool(const char *n) {
|
|
int r;
|
|
|
|
r = parse_boolean(n);
|
|
if (r > 0)
|
|
return SOCKET_ADDRESS_IPV6_ONLY;
|
|
if (r == 0)
|
|
return SOCKET_ADDRESS_BOTH;
|
|
|
|
return socket_address_bind_ipv6_only_from_string(n);
|
|
}
|
|
|
|
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;
|
|
|
|
if (a->sa.sa_family == AF_VSOCK)
|
|
return a->vm.svm_cid == b->vm.svm_cid;
|
|
|
|
return false;
|
|
}
|
|
|
|
int fd_inc_sndbuf(int fd, size_t n) {
|
|
int r, value;
|
|
socklen_t l = sizeof(value);
|
|
|
|
r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l);
|
|
if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2)
|
|
return 0;
|
|
|
|
/* If we have the privileges we will ignore the kernel limit. */
|
|
|
|
value = (int) n;
|
|
if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
|
|
if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
|
|
return -errno;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int fd_inc_rcvbuf(int fd, size_t n) {
|
|
int r, value;
|
|
socklen_t l = sizeof(value);
|
|
|
|
r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l);
|
|
if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2)
|
|
return 0;
|
|
|
|
/* If we have the privileges we will ignore the kernel limit. */
|
|
|
|
value = (int) n;
|
|
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
|
|
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
|
|
return -errno;
|
|
return 1;
|
|
}
|
|
|
|
static const char* const ip_tos_table[] = {
|
|
[IPTOS_LOWDELAY] = "low-delay",
|
|
[IPTOS_THROUGHPUT] = "throughput",
|
|
[IPTOS_RELIABILITY] = "reliability",
|
|
[IPTOS_LOWCOST] = "low-cost",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff);
|
|
|
|
bool ifname_valid(const char *p) {
|
|
bool numeric = true;
|
|
|
|
/* Checks whether a network interface name is valid. This is inspired by dev_valid_name() in the kernel sources
|
|
* but slightly stricter, as we only allow non-control, non-space ASCII characters in the interface name. We
|
|
* also don't permit names that only container numbers, to avoid confusion with numeric interface indexes. */
|
|
|
|
if (isempty(p))
|
|
return false;
|
|
|
|
if (strlen(p) >= IFNAMSIZ)
|
|
return false;
|
|
|
|
if (dot_or_dot_dot(p))
|
|
return false;
|
|
|
|
while (*p) {
|
|
if ((unsigned char) *p >= 127U)
|
|
return false;
|
|
|
|
if ((unsigned char) *p <= 32U)
|
|
return false;
|
|
|
|
if (IN_SET(*p, ':', '/'))
|
|
return false;
|
|
|
|
numeric = numeric && (*p >= '0' && *p <= '9');
|
|
p++;
|
|
}
|
|
|
|
if (numeric)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool address_label_valid(const char *p) {
|
|
|
|
if (isempty(p))
|
|
return false;
|
|
|
|
if (strlen(p) >= IFNAMSIZ)
|
|
return false;
|
|
|
|
while (*p) {
|
|
if ((uint8_t) *p >= 127U)
|
|
return false;
|
|
|
|
if ((uint8_t) *p <= 31U)
|
|
return false;
|
|
p++;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int getpeercred(int fd, struct ucred *ucred) {
|
|
socklen_t n = sizeof(struct ucred);
|
|
struct ucred u;
|
|
int r;
|
|
|
|
assert(fd >= 0);
|
|
assert(ucred);
|
|
|
|
r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &u, &n);
|
|
if (r < 0)
|
|
return -errno;
|
|
|
|
if (n != sizeof(struct ucred))
|
|
return -EIO;
|
|
|
|
/* Check if the data is actually useful and not suppressed due to namespacing issues */
|
|
if (!pid_is_valid(u.pid))
|
|
return -ENODATA;
|
|
|
|
/* Note that we don't check UID/GID here, as namespace translation works differently there: instead of
|
|
* receiving in "invalid" user/group we get the overflow UID/GID. */
|
|
|
|
*ucred = u;
|
|
return 0;
|
|
}
|
|
|
|
int getpeersec(int fd, char **ret) {
|
|
_cleanup_free_ char *s = NULL;
|
|
socklen_t n = 64;
|
|
|
|
assert(fd >= 0);
|
|
assert(ret);
|
|
|
|
for (;;) {
|
|
s = new0(char, n+1);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
if (getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n) >= 0)
|
|
break;
|
|
|
|
if (errno != ERANGE)
|
|
return -errno;
|
|
|
|
s = mfree(s);
|
|
}
|
|
|
|
if (isempty(s))
|
|
return -EOPNOTSUPP;
|
|
|
|
*ret = TAKE_PTR(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int getpeergroups(int fd, gid_t **ret) {
|
|
socklen_t n = sizeof(gid_t) * 64;
|
|
_cleanup_free_ gid_t *d = NULL;
|
|
|
|
assert(fd >= 0);
|
|
assert(ret);
|
|
|
|
for (;;) {
|
|
d = malloc(n);
|
|
if (!d)
|
|
return -ENOMEM;
|
|
|
|
if (getsockopt(fd, SOL_SOCKET, SO_PEERGROUPS, d, &n) >= 0)
|
|
break;
|
|
|
|
if (errno != ERANGE)
|
|
return -errno;
|
|
|
|
d = mfree(d);
|
|
}
|
|
|
|
assert_se(n % sizeof(gid_t) == 0);
|
|
n /= sizeof(gid_t);
|
|
|
|
if ((socklen_t) (int) n != n)
|
|
return -E2BIG;
|
|
|
|
*ret = d;
|
|
d = NULL;
|
|
|
|
return (int) n;
|
|
}
|
|
|
|
int send_one_fd_sa(
|
|
int transport_fd,
|
|
int fd,
|
|
const struct sockaddr *sa, socklen_t len,
|
|
int flags) {
|
|
|
|
union {
|
|
struct cmsghdr cmsghdr;
|
|
uint8_t buf[CMSG_SPACE(sizeof(int))];
|
|
} control = {};
|
|
struct msghdr mh = {
|
|
.msg_name = (struct sockaddr*) sa,
|
|
.msg_namelen = len,
|
|
.msg_control = &control,
|
|
.msg_controllen = sizeof(control),
|
|
};
|
|
struct cmsghdr *cmsg;
|
|
|
|
assert(transport_fd >= 0);
|
|
assert(fd >= 0);
|
|
|
|
cmsg = CMSG_FIRSTHDR(&mh);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
|
|
memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
|
|
|
|
mh.msg_controllen = CMSG_SPACE(sizeof(int));
|
|
if (sendmsg(transport_fd, &mh, MSG_NOSIGNAL | flags) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int receive_one_fd(int transport_fd, int flags) {
|
|
union {
|
|
struct cmsghdr cmsghdr;
|
|
uint8_t buf[CMSG_SPACE(sizeof(int))];
|
|
} control = {};
|
|
struct msghdr mh = {
|
|
.msg_control = &control,
|
|
.msg_controllen = sizeof(control),
|
|
};
|
|
struct cmsghdr *cmsg, *found = NULL;
|
|
|
|
assert(transport_fd >= 0);
|
|
|
|
/*
|
|
* Receive a single FD via @transport_fd. We don't care for
|
|
* the transport-type. We retrieve a single FD at most, so for
|
|
* packet-based transports, the caller must ensure to send
|
|
* only a single FD per packet. This is best used in
|
|
* combination with send_one_fd().
|
|
*/
|
|
|
|
if (recvmsg(transport_fd, &mh, MSG_NOSIGNAL | MSG_CMSG_CLOEXEC | flags) < 0)
|
|
return -errno;
|
|
|
|
CMSG_FOREACH(cmsg, &mh) {
|
|
if (cmsg->cmsg_level == SOL_SOCKET &&
|
|
cmsg->cmsg_type == SCM_RIGHTS &&
|
|
cmsg->cmsg_len == CMSG_LEN(sizeof(int))) {
|
|
assert(!found);
|
|
found = cmsg;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
cmsg_close_all(&mh);
|
|
return -EIO;
|
|
}
|
|
|
|
return *(int*) CMSG_DATA(found);
|
|
}
|
|
|
|
ssize_t next_datagram_size_fd(int fd) {
|
|
ssize_t l;
|
|
int k;
|
|
|
|
/* This is a bit like FIONREAD/SIOCINQ, however a bit more powerful. The difference being: recv(MSG_PEEK) will
|
|
* actually cause the next datagram in the queue to be validated regarding checksums, which FIONREAD doesn't
|
|
* do. This difference is actually of major importance as we need to be sure that the size returned here
|
|
* actually matches what we will read with recvmsg() next, as otherwise we might end up allocating a buffer of
|
|
* the wrong size. */
|
|
|
|
l = recv(fd, NULL, 0, MSG_PEEK|MSG_TRUNC);
|
|
if (l < 0) {
|
|
if (IN_SET(errno, EOPNOTSUPP, EFAULT))
|
|
goto fallback;
|
|
|
|
return -errno;
|
|
}
|
|
if (l == 0)
|
|
goto fallback;
|
|
|
|
return l;
|
|
|
|
fallback:
|
|
k = 0;
|
|
|
|
/* Some sockets (AF_PACKET) do not support null-sized recv() with MSG_TRUNC set, let's fall back to FIONREAD
|
|
* for them. Checksums don't matter for raw sockets anyway, hence this should be fine. */
|
|
|
|
if (ioctl(fd, FIONREAD, &k) < 0)
|
|
return -errno;
|
|
|
|
return (ssize_t) k;
|
|
}
|
|
|
|
int flush_accept(int fd) {
|
|
|
|
struct pollfd pollfd = {
|
|
.fd = fd,
|
|
.events = POLLIN,
|
|
};
|
|
int r;
|
|
|
|
|
|
/* Similar to flush_fd() but flushes all incoming connection by accepting them and immediately closing them. */
|
|
|
|
for (;;) {
|
|
int cfd;
|
|
|
|
r = poll(&pollfd, 1, 0);
|
|
if (r < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
return -errno;
|
|
|
|
} else if (r == 0)
|
|
return 0;
|
|
|
|
cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
|
|
if (cfd < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
if (errno == EAGAIN)
|
|
return 0;
|
|
|
|
return -errno;
|
|
}
|
|
|
|
close(cfd);
|
|
}
|
|
}
|
|
|
|
struct cmsghdr* cmsg_find(struct msghdr *mh, int level, int type, socklen_t length) {
|
|
struct cmsghdr *cmsg;
|
|
|
|
assert(mh);
|
|
|
|
CMSG_FOREACH(cmsg, mh)
|
|
if (cmsg->cmsg_level == level &&
|
|
cmsg->cmsg_type == type &&
|
|
(length == (socklen_t) -1 || length == cmsg->cmsg_len))
|
|
return cmsg;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int socket_ioctl_fd(void) {
|
|
int fd;
|
|
|
|
/* Create a socket to invoke the various network interface ioctl()s on. Traditionally only AF_INET was good for
|
|
* that. Since kernel 4.6 AF_NETLINK works for this too. We first try to use AF_INET hence, but if that's not
|
|
* available (for example, because it is made unavailable via SECCOMP or such), we'll fall back to the more
|
|
* generic AF_NETLINK. */
|
|
|
|
fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0);
|
|
if (fd < 0)
|
|
fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_GENERIC);
|
|
if (fd < 0)
|
|
return -errno;
|
|
|
|
return fd;
|
|
}
|