| /* |
| * Check decoding of SO_PEERCRED socket option. |
| * |
| * Copyright (c) 2017 Dmitry V. Levin <ldv@altlinux.org> |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "tests.h" |
| |
| #include <stddef.h> |
| #include <stdio.h> |
| #include <sys/socket.h> |
| #include <unistd.h> |
| |
| #include "print_fields.h" |
| |
| static const char *errstr; |
| |
| static int |
| get_peercred(int fd, void *val, socklen_t *len) |
| { |
| int rc = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, val, len); |
| errstr = sprintrc(rc); |
| return rc; |
| } |
| |
| int |
| main(void) |
| { |
| TAIL_ALLOC_OBJECT_CONST_PTR(struct ucred, peercred); |
| TAIL_ALLOC_OBJECT_CONST_PTR(socklen_t, len); |
| |
| int sv[2]; |
| if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv)) |
| perror_msg_and_skip("socketpair AF_UNIX SOCK_STREAM"); |
| |
| /* classic getsockopt */ |
| *len = sizeof(*peercred); |
| get_peercred(sv[0], peercred, len); |
| printf("getsockopt(%d, SOL_SOCKET, SO_PEERCRED", sv[0]); |
| PRINT_FIELD_D(", {", *peercred, pid); |
| PRINT_FIELD_UID(", ", *peercred, uid); |
| PRINT_FIELD_UID(", ", *peercred, gid); |
| printf("}, [%d]) = %s\n", *len, errstr); |
| |
| int fd = socket(AF_UNIX, SOCK_STREAM, 0); |
| if (fd < 0) |
| perror_msg_and_skip("socket AF_UNIX SOCK_STREAM"); |
| |
| /* getsockopt with optlen larger than necessary - shortened */ |
| *len = sizeof(*peercred) + 1; |
| get_peercred(fd, peercred, len); |
| printf("getsockopt(%d, SOL_SOCKET, SO_PEERCRED", fd); |
| PRINT_FIELD_D(", {", *peercred, pid); |
| PRINT_FIELD_UID(", ", *peercred, uid); |
| PRINT_FIELD_UID(", ", *peercred, gid); |
| printf("}, [%u->%d]) = %s\n", |
| (unsigned int) sizeof(*peercred) + 1, *len, errstr); |
| |
| /* getsockopt with optlen smaller than usual - truncated to ucred.pid */ |
| *len = sizeof(peercred->pid); |
| get_peercred(fd, peercred, len); |
| printf("getsockopt(%d, SOL_SOCKET, SO_PEERCRED", fd); |
| PRINT_FIELD_D(", {", *peercred, pid); |
| printf("}, [%d]) = %s\n", *len, errstr); |
| |
| /* getsockopt with optlen smaller than usual - truncated to ucred.uid */ |
| *len = offsetof(struct ucred, gid); |
| get_peercred(fd, peercred, len); |
| printf("getsockopt(%d, SOL_SOCKET, SO_PEERCRED", fd); |
| PRINT_FIELD_D(", {", *peercred, pid); |
| PRINT_FIELD_UID(", ", *peercred, uid); |
| printf("}, [%d]) = %s\n", *len, errstr); |
| |
| /* getsockopt with optlen larger than usual - truncated to raw */ |
| *len = sizeof(*peercred) - 1; |
| get_peercred(fd, peercred, len); |
| printf("getsockopt(%d, SOL_SOCKET, SO_PEERCRED, ", fd); |
| print_quoted_hex(peercred, *len); |
| printf(", [%d]) = %s\n", *len, errstr); |
| |
| /* getsockopt optval EFAULT */ |
| *len = sizeof(*peercred); |
| get_peercred(fd, &peercred->uid, len); |
| printf("getsockopt(%d, SOL_SOCKET, SO_PEERCRED, %p, [%d]) = %s\n", |
| fd, &peercred->uid, *len, errstr); |
| |
| /* getsockopt optlen EFAULT */ |
| get_peercred(fd, peercred, len + 1); |
| printf("getsockopt(%d, SOL_SOCKET, SO_PEERCRED, %p, %p) = %s\n", |
| fd, peercred, len + 1, errstr); |
| |
| puts("+++ exited with 0 +++"); |
| return 0; |
| } |