1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2018 Alan Somers
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 #include <sys/socket.h>
30 #include <sys/event.h>
31 #include <sys/sysctl.h>
32 #include <sys/un.h>
33 #include <errno.h>
34 #include <fcntl.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <poll.h>
38
39 #include <atf-c.h>
40
41 static void
do_socketpair(int * sv)42 do_socketpair(int *sv)
43 {
44 int s;
45
46 s = socketpair(PF_LOCAL, SOCK_STREAM, 0, sv);
47 ATF_REQUIRE_EQ(0, s);
48 ATF_REQUIRE(sv[0] >= 0);
49 ATF_REQUIRE(sv[1] >= 0);
50 ATF_REQUIRE(sv[0] != sv[1]);
51 }
52
53 static u_long
getsendspace(void)54 getsendspace(void)
55 {
56 u_long sendspace;
57
58 ATF_REQUIRE_MSG(sysctlbyname("net.local.stream.sendspace", &sendspace,
59 &(size_t){sizeof(u_long)}, NULL, 0) != -1,
60 "sysctl net.local.stream.sendspace failed: %s", strerror(errno));
61
62 return (sendspace);
63 }
64
65 /* getpeereid(3) should work with stream sockets created via socketpair(2) */
66 ATF_TC_WITHOUT_HEAD(getpeereid);
ATF_TC_BODY(getpeereid,tc)67 ATF_TC_BODY(getpeereid, tc)
68 {
69 int sv[2];
70 uid_t real_euid, euid;
71 gid_t real_egid, egid;
72
73 real_euid = geteuid();
74 real_egid = getegid();
75
76 do_socketpair(sv);
77
78 ATF_REQUIRE_EQ(0, getpeereid(sv[0], &euid, &egid));
79 ATF_CHECK_EQ(real_euid, euid);
80 ATF_CHECK_EQ(real_egid, egid);
81
82 ATF_REQUIRE_EQ(0, getpeereid(sv[1], &euid, &egid));
83 ATF_CHECK_EQ(real_euid, euid);
84 ATF_CHECK_EQ(real_egid, egid);
85
86 close(sv[0]);
87 close(sv[1]);
88 }
89
90 /* Sending zero bytes should succeed (once regressed in aba79b0f4a3f). */
91 ATF_TC_WITHOUT_HEAD(send_0);
ATF_TC_BODY(send_0,tc)92 ATF_TC_BODY(send_0, tc)
93 {
94 int sv[2];
95
96 do_socketpair(sv);
97 ATF_REQUIRE(send(sv[0], sv, 0, 0) == 0);
98 close(sv[0]);
99 close(sv[1]);
100 }
101
102 static void
check_writable(int fd,int expect)103 check_writable(int fd, int expect)
104 {
105 fd_set wrfds;
106 struct pollfd pfd[1];
107 struct kevent kev;
108 int nfds, kq;
109
110 FD_ZERO(&wrfds);
111 FD_SET(fd, &wrfds);
112 nfds = select(fd + 1, NULL, &wrfds, NULL,
113 &(struct timeval){.tv_usec = 1000});
114 ATF_REQUIRE_MSG(nfds == expect,
115 "select() returns %d errno %d", nfds, errno);
116
117 pfd[0] = (struct pollfd){
118 .fd = fd,
119 .events = POLLOUT | POLLWRNORM,
120 };
121 nfds = poll(pfd, 1, 1);
122 ATF_REQUIRE_MSG(nfds == expect,
123 "poll() returns %d errno %d", nfds, errno);
124
125 ATF_REQUIRE(kq = kqueue());
126 EV_SET(&kev, fd, EVFILT_WRITE, EV_ADD, 0, 0, NULL);
127 ATF_REQUIRE(kevent(kq, &kev, 1, NULL, 0, NULL) == 0);
128 nfds = kevent(kq, NULL, 0, &kev, 1,
129 &(struct timespec){.tv_nsec = 1000000});
130 ATF_REQUIRE_MSG(nfds == expect,
131 "kevent() returns %d errno %d", nfds, errno);
132 close(kq);
133 }
134
135 /*
136 * Make sure that a full socket is not reported as writable by event APIs.
137 */
138 ATF_TC_WITHOUT_HEAD(full_not_writable);
ATF_TC_BODY(full_not_writable,tc)139 ATF_TC_BODY(full_not_writable, tc)
140 {
141 void *buf;
142 u_long sendspace;
143 int sv[2];
144
145 sendspace = getsendspace();
146 ATF_REQUIRE((buf = malloc(sendspace)) != NULL);
147 do_socketpair(sv);
148 ATF_REQUIRE(fcntl(sv[0], F_SETFL, O_NONBLOCK) != -1);
149 do {} while (send(sv[0], buf, sendspace, 0) == (ssize_t)sendspace);
150 ATF_REQUIRE(errno == EAGAIN);
151 ATF_REQUIRE(fcntl(sv[0], F_SETFL, 0) != -1);
152
153 check_writable(sv[0], 0);
154
155 /* Read some data and re-check. */
156 ATF_REQUIRE(read(sv[1], buf, sendspace / 2) == (ssize_t)sendspace / 2);
157
158 check_writable(sv[0], 1);
159
160 free(buf);
161 close(sv[0]);
162 close(sv[1]);
163 }
164
ATF_TP_ADD_TCS(tp)165 ATF_TP_ADD_TCS(tp)
166 {
167 ATF_TP_ADD_TC(tp, getpeereid);
168 ATF_TP_ADD_TC(tp, send_0);
169 ATF_TP_ADD_TC(tp, full_not_writable);
170
171 return atf_no_error();
172 }
173