| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2010 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <arpa/inet.h> |
| #include <errno.h> |
| #include <limits.h> |
| #include <net/if.h> |
| #include <netdb.h> |
| #include <netinet/ip.h> |
| #include <poll.h> |
| #include <stddef.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "alloc-util.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "format-util.h" |
| #include "log.h" |
| #include "macro.h" |
| #include "missing.h" |
| #include "parse-util.h" |
| #include "path-util.h" |
| #include "process-util.h" |
| #include "socket-util.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "user-util.h" |
| #include "utf8.h" |
| #include "util.h" |
| |
| #if ENABLE_IDN |
| # define IDN_FLAGS NI_IDN |
| #else |
| # define IDN_FLAGS 0 |
| #endif |
| |
| static const char* const socket_address_type_table[] = { |
| [SOCK_STREAM] = "Stream", |
| [SOCK_DGRAM] = "Datagram", |
| [SOCK_RAW] = "Raw", |
| [SOCK_RDM] = "ReliableDatagram", |
| [SOCK_SEQPACKET] = "SequentialPacket", |
| [SOCK_DCCP] = "DatagramCongestionControl", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(socket_address_type, int); |
| |
| int socket_address_parse(SocketAddress *a, const char *s) { |
| _cleanup_free_ char *n = NULL; |
| char *e; |
| int r; |
| |
| assert(a); |
| assert(s); |
| |
| zero(*a); |
| a->type = SOCK_STREAM; |
| |
| if (*s == '[') { |
| uint16_t port; |
| |
| /* IPv6 in [x:.....:z]:p notation */ |
| |
| e = strchr(s+1, ']'); |
| if (!e) |
| return -EINVAL; |
| |
| n = strndup(s+1, e-s-1); |
| if (!n) |
| return -ENOMEM; |
| |
| errno = 0; |
| if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) |
| return errno > 0 ? -errno : -EINVAL; |
| |
| e++; |
| if (*e != ':') |
| return -EINVAL; |
| |
| e++; |
| r = parse_ip_port(e, &port); |
| if (r < 0) |
| return r; |
| |
| a->sockaddr.in6.sin6_family = AF_INET6; |
| a->sockaddr.in6.sin6_port = htobe16(port); |
| a->size = sizeof(struct sockaddr_in6); |
| |
| } else if (*s == '/') { |
| /* AF_UNIX socket */ |
| |
| size_t l; |
| |
| l = strlen(s); |
| if (l >= sizeof(a->sockaddr.un.sun_path)) |
| return -EINVAL; |
| |
| a->sockaddr.un.sun_family = AF_UNIX; |
| memcpy(a->sockaddr.un.sun_path, s, l); |
| a->size = offsetof(struct sockaddr_un, sun_path) + l + 1; |
| |
| } else if (*s == '@') { |
| /* Abstract AF_UNIX socket */ |
| size_t l; |
| |
| l = strlen(s+1); |
| if (l >= sizeof(a->sockaddr.un.sun_path) - 1) |
| return -EINVAL; |
| |
| a->sockaddr.un.sun_family = AF_UNIX; |
| memcpy(a->sockaddr.un.sun_path+1, s+1, l); |
| a->size = offsetof(struct sockaddr_un, sun_path) + 1 + l; |
| |
| } else if (startswith(s, "vsock:")) { |
| /* AF_VSOCK socket in vsock:cid:port notation */ |
| const char *cid_start = s + STRLEN("vsock:"); |
| unsigned port; |
| |
| e = strchr(cid_start, ':'); |
| if (!e) |
| return -EINVAL; |
| |
| r = safe_atou(e+1, &port); |
| if (r < 0) |
| return r; |
| |
| n = strndup(cid_start, e - cid_start); |
| if (!n) |
| return -ENOMEM; |
| |
| if (!isempty(n)) { |
| r = safe_atou(n, &a->sockaddr.vm.svm_cid); |
| if (r < 0) |
| return r; |
| } else |
| a->sockaddr.vm.svm_cid = VMADDR_CID_ANY; |
| |
| a->sockaddr.vm.svm_family = AF_VSOCK; |
| a->sockaddr.vm.svm_port = port; |
| a->size = sizeof(struct sockaddr_vm); |
| |
| } else { |
| uint16_t port; |
| |
| e = strchr(s, ':'); |
| if (e) { |
| r = parse_ip_port(e + 1, &port); |
| if (r < 0) |
| return r; |
| |
| n = strndup(s, e-s); |
| if (!n) |
| return -ENOMEM; |
| |
| /* IPv4 in w.x.y.z:p notation? */ |
| r = inet_pton(AF_INET, n, &a->sockaddr.in.sin_addr); |
| if (r < 0) |
| return -errno; |
| |
| if (r > 0) { |
| /* Gotcha, it's a traditional IPv4 address */ |
| a->sockaddr.in.sin_family = AF_INET; |
| a->sockaddr.in.sin_port = htobe16(port); |
| a->size = sizeof(struct sockaddr_in); |
| } else { |
| unsigned idx; |
| |
| if (strlen(n) > IF_NAMESIZE-1) |
| return -EINVAL; |
| |
| /* Uh, our last resort, an interface name */ |
| idx = if_nametoindex(n); |
| if (idx == 0) |
| return -EINVAL; |
| |
| a->sockaddr.in6.sin6_family = AF_INET6; |
| a->sockaddr.in6.sin6_port = htobe16(port); |
| a->sockaddr.in6.sin6_scope_id = idx; |
| a->sockaddr.in6.sin6_addr = in6addr_any; |
| a->size = sizeof(struct sockaddr_in6); |
| } |
| } else { |
| |
| /* Just a port */ |
| r = parse_ip_port(s, &port); |
| if (r < 0) |
| return r; |
| |
| if (socket_ipv6_is_supported()) { |
| a->sockaddr.in6.sin6_family = AF_INET6; |
| a->sockaddr.in6.sin6_port = htobe16(port); |
| a->sockaddr.in6.sin6_addr = in6addr_any; |
| a->size = sizeof(struct sockaddr_in6); |
| } else { |
| a->sockaddr.in.sin_family = AF_INET; |
| a->sockaddr.in.sin_port = htobe16(port); |
| a->sockaddr.in.sin_addr.s_addr = INADDR_ANY; |
| a->size = sizeof(struct sockaddr_in); |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| int socket_address_parse_and_warn(SocketAddress *a, const char *s) { |
| SocketAddress b; |
| int r; |
| |
| /* Similar to socket_address_parse() but warns for IPv6 sockets when we don't support them. */ |
| |
| r = socket_address_parse(&b, s); |
| if (r < 0) |
| return r; |
| |
| if (!socket_ipv6_is_supported() && b.sockaddr.sa.sa_family == AF_INET6) { |
| log_warning("Binding to IPv6 address not available since kernel does not support IPv6."); |
| return -EAFNOSUPPORT; |
| } |
| |
| *a = b; |
| return 0; |
| } |
| |
| int socket_address_parse_netlink(SocketAddress *a, const char *s) { |
| int family; |
| unsigned group = 0; |
| _cleanup_free_ char *sfamily = NULL; |
| assert(a); |
| assert(s); |
| |
| zero(*a); |
| a->type = SOCK_RAW; |
| |
| errno = 0; |
| if (sscanf(s, "%ms %u", &sfamily, &group) < 1) |
| return errno > 0 ? -errno : -EINVAL; |
| |
| family = netlink_family_from_string(sfamily); |
| if (family < 0) |
| return -EINVAL; |
| |
| a->sockaddr.nl.nl_family = AF_NETLINK; |
| a->sockaddr.nl.nl_groups = group; |
| |
| a->type = SOCK_RAW; |
| a->size = sizeof(struct sockaddr_nl); |
| a->protocol = family; |
| |
| return 0; |
| } |
| |
| int socket_address_verify(const SocketAddress *a) { |
| assert(a); |
| |
| switch (socket_address_family(a)) { |
| |
| case AF_INET: |
| if (a->size != sizeof(struct sockaddr_in)) |
| return -EINVAL; |
| |
| if (a->sockaddr.in.sin_port == 0) |
| return -EINVAL; |
| |
| if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
| return -EINVAL; |
| |
| return 0; |
| |
| case AF_INET6: |
| if (a->size != sizeof(struct sockaddr_in6)) |
| return -EINVAL; |
| |
| if (a->sockaddr.in6.sin6_port == 0) |
| return -EINVAL; |
| |
| if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
| return -EINVAL; |
| |
| return 0; |
| |
| case AF_UNIX: |
| if (a->size < offsetof(struct sockaddr_un, sun_path)) |
| return -EINVAL; |
| |
| if (a->size > offsetof(struct sockaddr_un, sun_path)) { |
| |
| if (a->sockaddr.un.sun_path[0] != 0) { |
| char *e; |
| |
| /* path */ |
| e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path)); |
| if (!e) |
| return -EINVAL; |
| |
| if (a->size != offsetof(struct sockaddr_un, sun_path) + (e - a->sockaddr.un.sun_path) + 1) |
| return -EINVAL; |
| } |
| } |
| |
| if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM, SOCK_SEQPACKET)) |
| return -EINVAL; |
| |
| return 0; |
| |
| case AF_NETLINK: |
| |
| if (a->size != sizeof(struct sockaddr_nl)) |
| return -EINVAL; |
| |
| if (!IN_SET(a->type, SOCK_RAW, SOCK_DGRAM)) |
| return -EINVAL; |
| |
| return 0; |
| |
| case AF_VSOCK: |
| if (a->size != sizeof(struct sockaddr_vm)) |
| return -EINVAL; |
| |
| if (!IN_SET(a->type, SOCK_STREAM, SOCK_DGRAM)) |
| return -EINVAL; |
| |
| return 0; |
| |
| default: |
| return -EAFNOSUPPORT; |
| } |
| } |
| |
| int socket_address_print(const SocketAddress *a, char **ret) { |
| int r; |
| |
| assert(a); |
| assert(ret); |
| |
| r = socket_address_verify(a); |
| if (r < 0) |
| return r; |
| |
| if (socket_address_family(a) == AF_NETLINK) { |
| _cleanup_free_ char *sfamily = NULL; |
| |
| r = netlink_family_to_string_alloc(a->protocol, &sfamily); |
| if (r < 0) |
| return r; |
| |
| r = asprintf(ret, "%s %u", sfamily, a->sockaddr.nl.nl_groups); |
| if (r < 0) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| return sockaddr_pretty(&a->sockaddr.sa, a->size, false, true, ret); |
| } |
| |
| bool socket_address_can_accept(const SocketAddress *a) { |
| assert(a); |
| |
| return |
| IN_SET(a->type, SOCK_STREAM, SOCK_SEQPACKET); |
| } |
| |
| bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) { |
| assert(a); |
| assert(b); |
| |
| /* Invalid addresses are unequal to all */ |
| if (socket_address_verify(a) < 0 || |
| socket_address_verify(b) < 0) |
| return false; |
| |
| if (a->type != b->type) |
| return false; |
| |
| if (socket_address_family(a) != socket_address_family(b)) |
| return false; |
| |
| switch (socket_address_family(a)) { |
| |
| case AF_INET: |
| if (a->sockaddr.in.sin_addr.s_addr != b->sockaddr.in.sin_addr.s_addr) |
| return false; |
| |
| if (a->sockaddr.in.sin_port != b->sockaddr.in.sin_port) |
| return false; |
| |
| break; |
| |
| case AF_INET6: |
| if (memcmp(&a->sockaddr.in6.sin6_addr, &b->sockaddr.in6.sin6_addr, sizeof(a->sockaddr.in6.sin6_addr)) != 0) |
| return false; |
| |
| if (a->sockaddr.in6.sin6_port != b->sockaddr.in6.sin6_port) |
| return false; |
| |
| break; |
| |
| case AF_UNIX: |
| if (a->size <= offsetof(struct sockaddr_un, sun_path) || |
| b->size <= offsetof(struct sockaddr_un, sun_path)) |
| return false; |
| |
| if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0)) |
| return false; |
| |
| if (a->sockaddr.un.sun_path[0]) { |
| if (!path_equal_or_files_same(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, 0)) |
| return false; |
| } else { |
| if (a->size != b->size) |
| return false; |
| |
| if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, a->size) != 0) |
| return false; |
| } |
| |
| break; |
| |
| case AF_NETLINK: |
| if (a->protocol != b->protocol) |
| return false; |
| |
| if (a->sockaddr.nl.nl_groups != b->sockaddr.nl.nl_groups) |
| return false; |
| |
| break; |
| |
| case AF_VSOCK: |
| if (a->sockaddr.vm.svm_cid != b->sockaddr.vm.svm_cid) |
| return false; |
| |
| if (a->sockaddr.vm.svm_port != b->sockaddr.vm.svm_port) |
| return false; |
| |
| break; |
| |
| default: |
| /* Cannot compare, so we assume the addresses are different */ |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool socket_address_is(const SocketAddress *a, const char *s, int type) { |
| struct SocketAddress b; |
| |
| assert(a); |
| assert(s); |
| |
| if (socket_address_parse(&b, s) < 0) |
| return false; |
| |
| b.type = type; |
| |
| return socket_address_equal(a, &b); |
| } |
| |
| bool socket_address_is_netlink(const SocketAddress *a, const char *s) { |
| struct SocketAddress b; |
| |
| assert(a); |
| assert(s); |
| |
| if (socket_address_parse_netlink(&b, s) < 0) |
| return false; |
| |
| return socket_address_equal(a, &b); |
| } |
| |
| const char* socket_address_get_path(const SocketAddress *a) { |
| assert(a); |
| |
| if (socket_address_family(a) != AF_UNIX) |
| return NULL; |
| |
| if (a->sockaddr.un.sun_path[0] == 0) |
| return NULL; |
| |
| return a->sockaddr.un.sun_path; |
| } |
| |
| bool socket_ipv6_is_supported(void) { |
| if (access("/proc/net/if_inet6", F_OK) != 0) |
| return false; |
| |
| return true; |
| } |
| |
| bool socket_address_matches_fd(const SocketAddress *a, int fd) { |
| SocketAddress b; |
| socklen_t solen; |
| |
| assert(a); |
| assert(fd >= 0); |
| |
| b.size = sizeof(b.sockaddr); |
| if (getsockname(fd, &b.sockaddr.sa, &b.size) < 0) |
| return false; |
| |
| if (b.sockaddr.sa.sa_family != a->sockaddr.sa.sa_family) |
| return false; |
| |
| solen = sizeof(b.type); |
| if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &b.type, &solen) < 0) |
| return false; |
| |
| if (b.type != a->type) |
| return false; |
| |
| if (a->protocol != 0) { |
| solen = sizeof(b.protocol); |
| if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &b.protocol, &solen) < 0) |
| return false; |
| |
| if (b.protocol != a->protocol) |
| return false; |
| } |
| |
| return socket_address_equal(a, &b); |
| } |
| |
| int sockaddr_port(const struct sockaddr *_sa, unsigned *ret_port) { |
| union sockaddr_union *sa = (union sockaddr_union*) _sa; |
| |
| /* Note, this returns the port as 'unsigned' rather than 'uint16_t', as AF_VSOCK knows larger ports */ |
| |
| assert(sa); |
| |
| switch (sa->sa.sa_family) { |
| |
| case AF_INET: |
| *ret_port = be16toh(sa->in.sin_port); |
| return 0; |
| |
| case AF_INET6: |
| *ret_port = be16toh(sa->in6.sin6_port); |
| return 0; |
| |
| 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_SNDBUF, &value, sizeof(value)) < 0) |
| if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &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_RCVBUF, &value, sizeof(value)) < 0) |
| if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &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 = s; |
| s = NULL; |
| |
| 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; |
| } |