Paolo Bonzini | 53fabd4 | 2017-03-16 16:29:45 +0100 | [diff] [blame] | 1 | /* |
| 2 | * systemd socket activation support |
| 3 | * |
| 4 | * Copyright 2017 Red Hat, Inc. and/or its affiliates |
| 5 | * |
| 6 | * Authors: |
| 7 | * Richard W.M. Jones <rjones@redhat.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 10 | * See the COPYING file in the top-level directory. |
| 11 | */ |
| 12 | |
| 13 | #include "qemu/osdep.h" |
| 14 | #include "qemu/systemd.h" |
| 15 | #include "qemu/cutils.h" |
| 16 | #include "qemu/error-report.h" |
| 17 | |
| 18 | #ifndef _WIN32 |
| 19 | unsigned int check_socket_activation(void) |
| 20 | { |
| 21 | const char *s; |
| 22 | unsigned long pid; |
| 23 | unsigned long nr_fds; |
| 24 | unsigned int i; |
| 25 | int fd; |
Eric Blake | 474a6e6 | 2020-04-20 12:53:08 -0500 | [diff] [blame] | 26 | int f; |
Paolo Bonzini | 53fabd4 | 2017-03-16 16:29:45 +0100 | [diff] [blame] | 27 | int err; |
| 28 | |
| 29 | s = getenv("LISTEN_PID"); |
| 30 | if (s == NULL) { |
| 31 | return 0; |
| 32 | } |
| 33 | err = qemu_strtoul(s, NULL, 10, &pid); |
| 34 | if (err) { |
| 35 | return 0; |
| 36 | } |
| 37 | if (pid != getpid()) { |
| 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | s = getenv("LISTEN_FDS"); |
| 42 | if (s == NULL) { |
| 43 | return 0; |
| 44 | } |
| 45 | err = qemu_strtoul(s, NULL, 10, &nr_fds); |
| 46 | if (err) { |
| 47 | return 0; |
| 48 | } |
| 49 | assert(nr_fds <= UINT_MAX); |
| 50 | |
| 51 | /* So these are not passed to any child processes we might start. */ |
| 52 | unsetenv("LISTEN_FDS"); |
| 53 | unsetenv("LISTEN_PID"); |
| 54 | |
| 55 | /* So the file descriptors don't leak into child processes. */ |
| 56 | for (i = 0; i < nr_fds; ++i) { |
| 57 | fd = FIRST_SOCKET_ACTIVATION_FD + i; |
Eric Blake | 474a6e6 | 2020-04-20 12:53:08 -0500 | [diff] [blame] | 58 | f = fcntl(fd, F_GETFD); |
| 59 | if (f == -1 || fcntl(fd, F_SETFD, f | FD_CLOEXEC) == -1) { |
Paolo Bonzini | 53fabd4 | 2017-03-16 16:29:45 +0100 | [diff] [blame] | 60 | /* If we cannot set FD_CLOEXEC then it probably means the file |
| 61 | * descriptor is invalid, so socket activation has gone wrong |
| 62 | * and we should exit. |
| 63 | */ |
| 64 | error_report("Socket activation failed: " |
Thomas Huth | 372a87a | 2019-10-18 15:07:16 +0200 | [diff] [blame] | 65 | "invalid file descriptor fd = %d: %s", |
| 66 | fd, g_strerror(errno)); |
Paolo Bonzini | 53fabd4 | 2017-03-16 16:29:45 +0100 | [diff] [blame] | 67 | exit(EXIT_FAILURE); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | return (unsigned int) nr_fds; |
| 72 | } |
| 73 | |
| 74 | #else /* !_WIN32 */ |
| 75 | unsigned int check_socket_activation(void) |
| 76 | { |
| 77 | return 0; |
| 78 | } |
| 79 | #endif |