1349 lines
42 KiB
C
1349 lines
42 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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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 <sys/ioctl.h>
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#include <unistd.h>
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#include <linux/if.h>
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#include "alloc-util.h"
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#include "errno-util.h"
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#include "escape.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 "io-util.h"
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#include "log.h"
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#include "memory-util.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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#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_verify(const SocketAddress *a, bool strict) {
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assert(a);
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/* With 'strict' we enforce additional sanity constraints which are not set by the standard,
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* but should only apply to sockets we create ourselves. */
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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, 0, 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, 0, 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 > sizeof(struct sockaddr_un) + !strict)
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/* If !strict, allow one extra byte, since getsockname() on Linux will append
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* a NUL byte if we have path sockets that are above sun_path's full size. */
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return -EINVAL;
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if (a->size > offsetof(struct sockaddr_un, sun_path) &&
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a->sockaddr.un.sun_path[0] != 0 &&
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strict) {
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/* Only validate file system sockets here, and only in strict mode */
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const char *e;
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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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/* If there's an embedded NUL byte, make sure the size of the socket address matches it */
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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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} else {
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/* If there's no embedded NUL byte, then the size needs to match the whole
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* structure or the structure with one extra NUL byte suffixed. (Yeah, Linux is awful,
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* and considers both equivalent: getsockname() even extends sockaddr_un beyond its
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* size if the path is non NUL terminated.)*/
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if (!IN_SET(a->size, sizeof(a->sockaddr.un.sun_path), sizeof(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, 0, 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, 0, 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, 0, 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, false); /* We do non-strict validation, because we want to be
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* able to pretty-print any socket the kernel considers
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* valid. We still need to do validation to know if we
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* can meaningfully print the address. */
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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, false) < 0 ||
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socket_address_verify(b, false) < 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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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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/* Note that this is only safe because we know that there's an extra NUL byte after the sockaddr_un
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* structure. On Linux AF_UNIX file system socket addresses don't have to be NUL terminated if they take up the
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* full sun_path space. */
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assert_cc(sizeof(union sockaddr_union) >= sizeof(struct sockaddr_un)+1);
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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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const union sockaddr_union *sa = (const 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:
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*ret_port = sa->vm.svm_port;
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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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const union in_addr_union *sockaddr_in_addr(const struct sockaddr *_sa) {
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const union sockaddr_union *sa = (const union sockaddr_union*) _sa;
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if (!sa)
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return NULL;
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switch (sa->sa.sa_family) {
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case AF_INET:
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return (const union in_addr_union*) &sa->in.sin_addr;
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case AF_INET6:
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return (const union in_addr_union*) &sa->in6.sin6_addr;
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default:
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return NULL;
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}
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}
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int sockaddr_pretty(
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const struct sockaddr *_sa,
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socklen_t salen,
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bool translate_ipv6,
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bool include_port,
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char **ret) {
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union sockaddr_union *sa = (union sockaddr_union*) _sa;
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char *p;
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int r;
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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 = be32toh(sa->in.sin_addr.s_addr);
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if (include_port)
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r = 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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be16toh(sa->in.sin_port));
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else
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r = asprintf(&p,
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"%u.%u.%u.%u",
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a >> 24, (a >> 16) & 0xFF, (a >> 8) & 0xFF, a & 0xFF);
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if (r < 0)
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return -ENOMEM;
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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 &&
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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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r = 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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be16toh(sa->in6.sin6_port));
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else
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r = asprintf(&p,
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"%u.%u.%u.%u",
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a[0], a[1], a[2], a[3]);
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if (r < 0)
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return -ENOMEM;
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} else {
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char a[INET6_ADDRSTRLEN], ifname[IF_NAMESIZE + 1];
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inet_ntop(AF_INET6, &sa->in6.sin6_addr, a, sizeof(a));
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if (sa->in6.sin6_scope_id != 0)
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format_ifname_full(sa->in6.sin6_scope_id, ifname, FORMAT_IFNAME_IFINDEX);
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if (include_port) {
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r = asprintf(&p,
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"[%s]:%u%s%s",
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a,
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be16toh(sa->in6.sin6_port),
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sa->in6.sin6_scope_id != 0 ? "%" : "",
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sa->in6.sin6_scope_id != 0 ? ifname : "");
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if (r < 0)
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return -ENOMEM;
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} else {
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p = sa->in6.sin6_scope_id != 0 ? strjoin(a, "%", ifname) : 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:
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if (salen <= offsetof(struct sockaddr_un, sun_path) ||
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(sa->un.sun_path[0] == 0 && salen == offsetof(struct sockaddr_un, sun_path) + 1))
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/* The name must have at least one character (and the leading NUL does not count) */
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p = strdup("<unnamed>");
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else {
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/* Note that we calculate the path pointer here through the .un_buffer[] field, in order to
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* outtrick bounds checking tools such as ubsan, which are too smart for their own good: on
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* Linux the kernel may return sun_path[] data one byte longer than the declared size of the
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* field. */
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char *path = (char*) sa->un_buffer + offsetof(struct sockaddr_un, sun_path);
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size_t path_len = salen - offsetof(struct sockaddr_un, sun_path);
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if (path[0] == 0) {
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/* Abstract socket. When parsing address information from, we
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* explicitly reject overly long paths and paths with embedded NULs.
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* But we might get such a socket from the outside. Let's return
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* something meaningful and printable in this case. */
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_cleanup_free_ char *e = NULL;
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e = cescape_length(path + 1, path_len - 1);
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if (!e)
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return -ENOMEM;
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p = strjoin("@", e);
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} else {
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if (path[path_len - 1] == '\0')
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/* We expect a terminating NUL and don't print it */
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path_len --;
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p = cescape_length(path, path_len);
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}
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}
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if (!p)
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return -ENOMEM;
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break;
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case AF_VSOCK:
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if (include_port) {
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if (sa->vm.svm_cid == VMADDR_CID_ANY)
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r = asprintf(&p, "vsock::%u", sa->vm.svm_port);
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else
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r = asprintf(&p, "vsock:%u:%u", sa->vm.svm_cid, sa->vm.svm_port);
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} else
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r = asprintf(&p, "vsock:%u", sa->vm.svm_cid);
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if (r < 0)
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return -ENOMEM;
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break;
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default:
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return -EOPNOTSUPP;
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}
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*ret = p;
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return 0;
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}
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int getpeername_pretty(int fd, bool include_port, char **ret) {
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union sockaddr_union sa;
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socklen_t salen = sizeof(sa);
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int r;
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assert(fd >= 0);
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assert(ret);
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if (getpeername(fd, &sa.sa, &salen) < 0)
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return -errno;
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if (sa.sa.sa_family == AF_UNIX) {
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struct ucred ucred = {};
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/* UNIX connection sockets are anonymous, so let's use
|
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* PID/UID as pretty credentials instead */
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r = getpeercred(fd, &ucred);
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if (r < 0)
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return r;
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if (asprintf(ret, "PID "PID_FMT"/UID "UID_FMT, ucred.pid, ucred.uid) < 0)
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return -ENOMEM;
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|
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return 0;
|
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}
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|
|
/* 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;
|
|
}
|
|
|
|
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 socket_address_bind_ipv6_only_or_bool_from_string(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_set_sndbuf(int fd, size_t n, bool increase) {
|
|
int r, value;
|
|
socklen_t l = sizeof(value);
|
|
|
|
if (n > INT_MAX)
|
|
return -ERANGE;
|
|
|
|
r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l);
|
|
if (r >= 0 && l == sizeof(value) && increase ? (size_t) value >= n*2 : (size_t) value == n*2)
|
|
return 0;
|
|
|
|
/* First, try to set the buffer size with SO_SNDBUF. */
|
|
r = setsockopt_int(fd, SOL_SOCKET, SO_SNDBUF, n);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* SO_SNDBUF above may set to the kernel limit, instead of the requested size.
|
|
* So, we need to check the actual buffer size here. */
|
|
l = sizeof(value);
|
|
r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l);
|
|
if (r >= 0 && l == sizeof(value) && increase ? (size_t) value >= n*2 : (size_t) value == n*2)
|
|
return 1;
|
|
|
|
/* If we have the privileges we will ignore the kernel limit. */
|
|
r = setsockopt_int(fd, SOL_SOCKET, SO_SNDBUFFORCE, n);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int fd_set_rcvbuf(int fd, size_t n, bool increase) {
|
|
int r, value;
|
|
socklen_t l = sizeof(value);
|
|
|
|
if (n > INT_MAX)
|
|
return -ERANGE;
|
|
|
|
r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l);
|
|
if (r >= 0 && l == sizeof(value) && increase ? (size_t) value >= n*2 : (size_t) value == n*2)
|
|
return 0;
|
|
|
|
/* First, try to set the buffer size with SO_RCVBUF. */
|
|
r = setsockopt_int(fd, SOL_SOCKET, SO_RCVBUF, n);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* SO_RCVBUF above may set to the kernel limit, instead of the requested size.
|
|
* So, we need to check the actual buffer size here. */
|
|
l = sizeof(value);
|
|
r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l);
|
|
if (r >= 0 && l == sizeof(value) && increase ? (size_t) value >= n*2 : (size_t) value == n*2)
|
|
return 1;
|
|
|
|
/* If we have the privileges we will ignore the kernel limit. */
|
|
r = setsockopt_int(fd, SOL_SOCKET, SO_RCVBUFFORCE, n);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
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_full(const char *p, IfnameValidFlags flags) {
|
|
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. */
|
|
|
|
assert(!(flags & ~_IFNAME_VALID_ALL));
|
|
|
|
if (isempty(p))
|
|
return false;
|
|
|
|
if (flags & IFNAME_VALID_ALTERNATIVE) {
|
|
if (strlen(p) >= ALTIFNAMSIZ)
|
|
return false;
|
|
} else {
|
|
if (strlen(p) >= IFNAMSIZ)
|
|
return false;
|
|
}
|
|
|
|
if (dot_or_dot_dot(p))
|
|
return false;
|
|
|
|
for (const char *t = p; *t; t++) {
|
|
if ((unsigned char) *t >= 127U)
|
|
return false;
|
|
|
|
if ((unsigned char) *t <= 32U)
|
|
return false;
|
|
|
|
if (IN_SET(*t, ':', '/'))
|
|
return false;
|
|
|
|
numeric = numeric && (*t >= '0' && *t <= '9');
|
|
}
|
|
|
|
if (numeric) {
|
|
if (!(flags & IFNAME_VALID_NUMERIC))
|
|
return false;
|
|
|
|
/* Verify that the number is well-formatted and in range. */
|
|
if (parse_ifindex(p) < 0)
|
|
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 = TAKE_PTR(d);
|
|
|
|
return (int) n;
|
|
}
|
|
|
|
ssize_t send_one_fd_iov_sa(
|
|
int transport_fd,
|
|
int fd,
|
|
struct iovec *iov, size_t iovlen,
|
|
const struct sockaddr *sa, socklen_t len,
|
|
int flags) {
|
|
|
|
CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int))) control = {};
|
|
struct msghdr mh = {
|
|
.msg_name = (struct sockaddr*) sa,
|
|
.msg_namelen = len,
|
|
.msg_iov = iov,
|
|
.msg_iovlen = iovlen,
|
|
};
|
|
ssize_t k;
|
|
|
|
assert(transport_fd >= 0);
|
|
|
|
/*
|
|
* We need either an FD or data to send.
|
|
* If there's nothing, return an error.
|
|
*/
|
|
if (fd < 0 && !iov)
|
|
return -EINVAL;
|
|
|
|
if (fd >= 0) {
|
|
struct cmsghdr *cmsg;
|
|
|
|
mh.msg_control = &control;
|
|
mh.msg_controllen = sizeof(control);
|
|
|
|
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));
|
|
}
|
|
k = sendmsg(transport_fd, &mh, MSG_NOSIGNAL | flags);
|
|
if (k < 0)
|
|
return (ssize_t) -errno;
|
|
|
|
return k;
|
|
}
|
|
|
|
int send_one_fd_sa(
|
|
int transport_fd,
|
|
int fd,
|
|
const struct sockaddr *sa, socklen_t len,
|
|
int flags) {
|
|
|
|
assert(fd >= 0);
|
|
|
|
return (int) send_one_fd_iov_sa(transport_fd, fd, NULL, 0, sa, len, flags);
|
|
}
|
|
|
|
ssize_t receive_one_fd_iov(
|
|
int transport_fd,
|
|
struct iovec *iov, size_t iovlen,
|
|
int flags,
|
|
int *ret_fd) {
|
|
|
|
CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int))) control;
|
|
struct msghdr mh = {
|
|
.msg_control = &control,
|
|
.msg_controllen = sizeof(control),
|
|
.msg_iov = iov,
|
|
.msg_iovlen = iovlen,
|
|
};
|
|
struct cmsghdr *found;
|
|
ssize_t k;
|
|
|
|
assert(transport_fd >= 0);
|
|
assert(ret_fd);
|
|
|
|
/*
|
|
* 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().
|
|
*/
|
|
|
|
k = recvmsg_safe(transport_fd, &mh, MSG_CMSG_CLOEXEC | flags);
|
|
if (k < 0)
|
|
return k;
|
|
|
|
found = cmsg_find(&mh, SOL_SOCKET, SCM_RIGHTS, CMSG_LEN(sizeof(int)));
|
|
if (!found) {
|
|
cmsg_close_all(&mh);
|
|
|
|
/* If didn't receive an FD or any data, return an error. */
|
|
if (k == 0)
|
|
return -EIO;
|
|
}
|
|
|
|
if (found)
|
|
*ret_fd = *(int*) CMSG_DATA(found);
|
|
else
|
|
*ret_fd = -1;
|
|
|
|
return k;
|
|
}
|
|
|
|
int receive_one_fd(int transport_fd, int flags) {
|
|
int fd;
|
|
ssize_t k;
|
|
|
|
k = receive_one_fd_iov(transport_fd, NULL, 0, flags, &fd);
|
|
if (k == 0)
|
|
return fd;
|
|
|
|
/* k must be negative, since receive_one_fd_iov() only returns
|
|
* a positive value if data was received through the iov. */
|
|
assert(k < 0);
|
|
return (int) k;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* Put a limit on how many times will attempt to call accept4(). We loop
|
|
* only on "transient" errors, but let's make sure we don't loop forever. */
|
|
#define MAX_FLUSH_ITERATIONS 1024
|
|
|
|
int flush_accept(int fd) {
|
|
|
|
int r, b;
|
|
socklen_t l = sizeof(b);
|
|
|
|
/* Similar to flush_fd() but flushes all incoming connections by accepting and immediately closing
|
|
* them. */
|
|
|
|
if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &b, &l) < 0)
|
|
return -errno;
|
|
|
|
assert(l == sizeof(b));
|
|
if (!b) /* Let's check if this socket accepts connections before calling accept(). accept4() can
|
|
* return EOPNOTSUPP if the fd is not a listening socket, which we should treat as a fatal
|
|
* error, or in case the incoming TCP connection triggered a network issue, which we want to
|
|
* treat as a transient error. Thus, let's rule out the first reason for EOPNOTSUPP early, so
|
|
* we can loop safely on transient errors below. */
|
|
return -ENOTTY;
|
|
|
|
for (unsigned iteration = 0;; iteration++) {
|
|
int cfd;
|
|
|
|
r = fd_wait_for_event(fd, POLLIN, 0);
|
|
if (r < 0) {
|
|
if (r == -EINTR)
|
|
continue;
|
|
|
|
return r;
|
|
}
|
|
if (r == 0)
|
|
return 0;
|
|
|
|
if (iteration >= MAX_FLUSH_ITERATIONS)
|
|
return log_debug_errno(SYNTHETIC_ERRNO(EBUSY),
|
|
"Failed to flush connections within " STRINGIFY(MAX_FLUSH_ITERATIONS) " iterations.");
|
|
|
|
cfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
|
|
if (cfd < 0) {
|
|
if (errno == EAGAIN)
|
|
return 0;
|
|
|
|
if (ERRNO_IS_ACCEPT_AGAIN(errno))
|
|
continue;
|
|
|
|
return -errno;
|
|
}
|
|
|
|
safe_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;
|
|
}
|
|
|
|
int sockaddr_un_unlink(const struct sockaddr_un *sa) {
|
|
const char *p, * nul;
|
|
|
|
assert(sa);
|
|
|
|
if (sa->sun_family != AF_UNIX)
|
|
return -EPROTOTYPE;
|
|
|
|
if (sa->sun_path[0] == 0) /* Nothing to do for abstract sockets */
|
|
return 0;
|
|
|
|
/* The path in .sun_path is not necessarily NUL terminated. Let's fix that. */
|
|
nul = memchr(sa->sun_path, 0, sizeof(sa->sun_path));
|
|
if (nul)
|
|
p = sa->sun_path;
|
|
else
|
|
p = memdupa_suffix0(sa->sun_path, sizeof(sa->sun_path));
|
|
|
|
if (unlink(p) < 0)
|
|
return -errno;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int sockaddr_un_set_path(struct sockaddr_un *ret, const char *path) {
|
|
size_t l;
|
|
|
|
assert(ret);
|
|
assert(path);
|
|
|
|
/* Initialize ret->sun_path from the specified argument. This will interpret paths starting with '@' as
|
|
* abstract namespace sockets, and those starting with '/' as regular filesystem sockets. It won't accept
|
|
* anything else (i.e. no relative paths), to avoid ambiguities. Note that this function cannot be used to
|
|
* reference paths in the abstract namespace that include NUL bytes in the name. */
|
|
|
|
l = strlen(path);
|
|
if (l < 2)
|
|
return -EINVAL;
|
|
if (!IN_SET(path[0], '/', '@'))
|
|
return -EINVAL;
|
|
|
|
/* Don't allow paths larger than the space in sockaddr_un. Note that we are a tiny bit more restrictive than
|
|
* the kernel is: we insist on NUL termination (both for abstract namespace and regular file system socket
|
|
* addresses!), which the kernel doesn't. We do this to reduce chance of incompatibility with other apps that
|
|
* do not expect non-NUL terminated file system path*/
|
|
if (l+1 > sizeof(ret->sun_path))
|
|
return -EINVAL;
|
|
|
|
*ret = (struct sockaddr_un) {
|
|
.sun_family = AF_UNIX,
|
|
};
|
|
|
|
if (path[0] == '@') {
|
|
/* Abstract namespace socket */
|
|
memcpy(ret->sun_path + 1, path + 1, l); /* copy *with* trailing NUL byte */
|
|
return (int) (offsetof(struct sockaddr_un, sun_path) + l); /* 🔥 *don't* 🔥 include trailing NUL in size */
|
|
|
|
} else {
|
|
assert(path[0] == '/');
|
|
|
|
/* File system socket */
|
|
memcpy(ret->sun_path, path, l + 1); /* copy *with* trailing NUL byte */
|
|
return (int) (offsetof(struct sockaddr_un, sun_path) + l + 1); /* include trailing NUL in size */
|
|
}
|
|
}
|
|
|
|
int socket_bind_to_ifname(int fd, const char *ifname) {
|
|
assert(fd >= 0);
|
|
|
|
/* Call with NULL to drop binding */
|
|
|
|
if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen_ptr(ifname)) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int socket_bind_to_ifindex(int fd, int ifindex) {
|
|
char ifname[IF_NAMESIZE + 1];
|
|
int r;
|
|
|
|
assert(fd >= 0);
|
|
|
|
if (ifindex <= 0) {
|
|
/* Drop binding */
|
|
if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, NULL, 0) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
r = setsockopt_int(fd, SOL_SOCKET, SO_BINDTOIFINDEX, ifindex);
|
|
if (r != -ENOPROTOOPT)
|
|
return r;
|
|
|
|
/* Fall back to SO_BINDTODEVICE on kernels < 5.0 which didn't have SO_BINDTOIFINDEX */
|
|
if (!format_ifname(ifindex, ifname))
|
|
return -errno;
|
|
|
|
return socket_bind_to_ifname(fd, ifname);
|
|
}
|
|
|
|
ssize_t recvmsg_safe(int sockfd, struct msghdr *msg, int flags) {
|
|
ssize_t n;
|
|
|
|
/* A wrapper around recvmsg() that checks for MSG_CTRUNC, and turns it into an error, in a reasonably
|
|
* safe way, closing any SCM_RIGHTS fds in the error path.
|
|
*
|
|
* Note that unlike our usual coding style this might modify *msg on failure. */
|
|
|
|
n = recvmsg(sockfd, msg, flags);
|
|
if (n < 0)
|
|
return -errno;
|
|
|
|
if (FLAGS_SET(msg->msg_flags, MSG_CTRUNC)) {
|
|
cmsg_close_all(msg);
|
|
return -EXFULL; /* a recognizable error code */
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
int socket_get_family(int fd, int *ret) {
|
|
int af;
|
|
socklen_t sl = sizeof(af);
|
|
|
|
if (getsockopt(fd, SOL_SOCKET, SO_DOMAIN, &af, &sl) < 0)
|
|
return -errno;
|
|
|
|
if (sl != sizeof(af))
|
|
return -EINVAL;
|
|
|
|
return af;
|
|
}
|
|
|
|
int socket_set_recvpktinfo(int fd, int af, bool b) {
|
|
int r;
|
|
|
|
if (af == AF_UNSPEC) {
|
|
r = socket_get_family(fd, &af);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
switch (af) {
|
|
|
|
case AF_INET:
|
|
return setsockopt_int(fd, IPPROTO_IP, IP_PKTINFO, b);
|
|
|
|
case AF_INET6:
|
|
return setsockopt_int(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, b);
|
|
|
|
case AF_NETLINK:
|
|
return setsockopt_int(fd, SOL_NETLINK, NETLINK_PKTINFO, b);
|
|
|
|
case AF_PACKET:
|
|
return setsockopt_int(fd, SOL_PACKET, PACKET_AUXDATA, b);
|
|
|
|
default:
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
}
|
|
|
|
int socket_set_unicast_if(int fd, int af, int ifi) {
|
|
be32_t ifindex_be = htobe32(ifi);
|
|
int r;
|
|
|
|
if (af == AF_UNSPEC) {
|
|
r = socket_get_family(fd, &af);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
switch (af) {
|
|
|
|
case AF_INET:
|
|
if (setsockopt(fd, IPPROTO_IP, IP_UNICAST_IF, &ifindex_be, sizeof(ifindex_be)) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
|
|
case AF_INET6:
|
|
if (setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_IF, &ifindex_be, sizeof(ifindex_be)) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
|
|
default:
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
}
|
|
|
|
int socket_set_option(int fd, int af, int opt_ipv4, int opt_ipv6, int val) {
|
|
int r;
|
|
|
|
if (af == AF_UNSPEC) {
|
|
r = socket_get_family(fd, &af);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
switch (af) {
|
|
|
|
case AF_INET:
|
|
return setsockopt_int(fd, IPPROTO_IP, opt_ipv4, val);
|
|
|
|
case AF_INET6:
|
|
return setsockopt_int(fd, IPPROTO_IPV6, opt_ipv6, val);
|
|
|
|
default:
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
}
|
|
|
|
int socket_get_mtu(int fd, int af, size_t *ret) {
|
|
int mtu, r;
|
|
|
|
if (af == AF_UNSPEC) {
|
|
r = socket_get_family(fd, &af);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
switch (af) {
|
|
|
|
case AF_INET:
|
|
r = getsockopt_int(fd, IPPROTO_IP, IP_MTU, &mtu);
|
|
break;
|
|
|
|
case AF_INET6:
|
|
r = getsockopt_int(fd, IPPROTO_IPV6, IPV6_MTU, &mtu);
|
|
break;
|
|
|
|
default:
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
|
|
if (r < 0)
|
|
return r;
|
|
if (mtu <= 0)
|
|
return -EINVAL;
|
|
|
|
*ret = (size_t) mtu;
|
|
return 0;
|
|
}
|