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/*
* Check decoding of SO_PEERCRED socket option.
*
* Copyright (c) 2017 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2017-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "pidns.h"
#include <stddef.h>
#include <stdio.h>
#include <string.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;
}
static const char *
so_str(void)
{
static char buf[256];
if (!buf[0]) {
#if XLAT_RAW
snprintf(buf, sizeof(buf),
"%#x, %#x", SOL_SOCKET, SO_PEERCRED);
#elif XLAT_VERBOSE
snprintf(buf, sizeof(buf),
"%#x /* SOL_SOCKET */, %#x /* SO_PEERCRED */",
SOL_SOCKET, SO_PEERCRED);
#else
snprintf(buf, sizeof(buf),
"SOL_SOCKET, SO_PEERCRED");
#endif
}
return buf;
}
int
main(void)
{
PIDNS_TEST_INIT;
TAIL_ALLOC_OBJECT_CONST_PTR(struct ucred, peercred);
TAIL_ALLOC_OBJECT_CONST_PTR(socklen_t, len);
const unsigned int sizeof_pid = sizeof(peercred->pid);
struct ucred *const pid = tail_alloc(sizeof_pid);
const unsigned int sizeof_pid_truncated = sizeof_pid - 1;
struct ucred *const pid_truncated =
tail_alloc(sizeof_pid_truncated);
const unsigned int sizeof_uid = offsetofend(struct ucred, uid);
struct ucred *const uid = tail_alloc(sizeof_uid);
const unsigned int sizeof_uid_truncated = sizeof_uid - 1;
struct ucred *const uid_truncated =
tail_alloc(sizeof_uid_truncated);
const unsigned int sizeof_gid_truncated =
offsetofend(struct ucred, gid) - 1;
struct ucred *const gid_truncated =
tail_alloc(sizeof_gid_truncated);
const char *pid_str = pidns_pid2str(PT_TGID);
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);
pidns_print_leader();
printf("getsockopt(%d, %s", sv[0], so_str());
printf(", {");
PRINT_FIELD_D(*peercred, pid);
printf("%s", pid_str);
printf(", ");
PRINT_FIELD_ID(*peercred, uid);
printf(", ");
PRINT_FIELD_ID(*peercred, gid);
printf("}, [%d]) = %s\n", *len, errstr);
/* getsockopt with zero optlen */
*len = 0;
get_peercred(sv[0], peercred, len);
pidns_print_leader();
printf("getsockopt(%d, %s, %p, [0]) = %s\n",
sv[0], so_str(), peercred, errstr);
/* getsockopt with optlen larger than necessary - shortened */
*len = sizeof(*peercred) + 1;
get_peercred(sv[0], peercred, len);
pidns_print_leader();
printf("getsockopt(%d, %s", sv[0], so_str());
printf(", {");
PRINT_FIELD_D(*peercred, pid);
printf("%s", pid_str);
printf(", ");
PRINT_FIELD_ID(*peercred, uid);
printf(", ");
PRINT_FIELD_ID(*peercred, gid);
printf("}, [%u => %d]) = %s\n",
(unsigned int) sizeof(*peercred) + 1, *len, errstr);
/*
* getsockopt with optlen less than offsetofend(struct ucred, pid):
* the part of struct ucred.pid is printed in hex.
*/
*len = sizeof_pid_truncated;
get_peercred(sv[0], pid_truncated, len);
pidns_print_leader();
printf("getsockopt(%d, %s, {pid=", sv[0], so_str());
print_quoted_hex(pid_truncated, *len);
printf("}, [%d]) = %s\n", *len, errstr);
/*
* getsockopt with optlen equals to sizeof(struct ucred.pid):
* struct ucred.uid and struct ucred.gid are not printed.
*/
*len = sizeof_pid;
get_peercred(sv[0], pid, len);
pidns_print_leader();
printf("getsockopt(%d, %s", sv[0], so_str());
printf(", {");
PRINT_FIELD_D(*pid, pid);
printf("%s", pid_str);
printf("}, [%d]) = %s\n", *len, errstr);
/*
* getsockopt with optlen greater than sizeof(struct ucred.pid)
* but smaller than offsetofend(struct ucred, uid):
* the part of struct ucred.uid is printed in hex.
*/
*len = sizeof_uid_truncated;
get_peercred(sv[0], uid_truncated, len);
/*
* Copy to a properly aligned structure to avoid unaligned access
* to struct ucred.pid field.
*/
memcpy(uid, uid_truncated, sizeof_uid_truncated);
pidns_print_leader();
printf("getsockopt(%d, %s", sv[0], so_str());
printf(", {");
PRINT_FIELD_D(*uid, pid);
printf("%s", pid_str);
printf(", uid=");
print_quoted_hex(&uid->uid, sizeof_uid_truncated -
offsetof(struct ucred, uid));
printf("}, [%d]) = %s\n", *len, errstr);
/*
* getsockopt with optlen equals to offsetofend(struct ucred, uid):
* struct ucred.gid is not printed.
*/
*len = sizeof_uid;
get_peercred(sv[0], uid, len);
pidns_print_leader();
printf("getsockopt(%d, %s", sv[0], so_str());
printf(", {");
PRINT_FIELD_D(*uid, pid);
printf("%s", pid_str);
printf(", ");
PRINT_FIELD_ID(*uid, uid);
printf("}, [%d]) = %s\n", *len, errstr);
/*
* getsockopt with optlen greater than sizeof(struct ucred.uid)
* but smaller than offsetofend(struct ucred, gid):
* the part of struct ucred.gid is printed in hex.
*/
*len = sizeof_gid_truncated;
get_peercred(sv[0], gid_truncated, len);
/*
* Copy to a properly aligned structure to avoid unaligned access
* to struct ucred.pid and struct ucred.uid fields.
*/
memcpy(peercred, gid_truncated, sizeof_gid_truncated);
pidns_print_leader();
printf("getsockopt(%d, %s", sv[0], so_str());
printf(", {");
PRINT_FIELD_D(*peercred, pid);
printf("%s", pid_str);
printf(", ");
PRINT_FIELD_ID(*peercred, uid);
printf(", gid=");
print_quoted_hex(&peercred->gid, sizeof_gid_truncated -
offsetof(struct ucred, gid));
printf("}, [%d]) = %s\n", *len, errstr);
/* getsockopt optval EFAULT */
*len = sizeof(*peercred);
get_peercred(sv[0], &peercred->uid, len);
pidns_print_leader();
printf("getsockopt(%d, %s, %p, [%d]) = %s\n",
sv[0], so_str(), &peercred->uid, *len, errstr);
/* getsockopt optlen EFAULT */
get_peercred(sv[0], peercred, len + 1);
pidns_print_leader();
printf("getsockopt(%d, %s, %p, %p) = %s\n",
sv[0], so_str(), peercred, len + 1, errstr);
pidns_print_leader();
puts("+++ exited with 0 +++");
return 0;
}
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