1 /*
2 * Copyright (c) 2016 Cyril Hrubis <chrubis@suse.cz>
3 * Copyright (c) 2016 Michal Kubecek <mkubecek@suse.cz>
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 /*
20 * This is a regression test for kernel commit:
21 *
22 * 197c949e7798 udp: properly support MSG_PEEK with truncated buffers
23 *
24 * NOTE: The testcase will hang on upatched stable kernel.
25 */
26
27 #include <string.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <unistd.h>
31 #include <sys/types.h>
32 #include <sys/socket.h>
33 #include <netinet/in.h>
34
35 #include "tst_test.h"
36 #include "lapi/socket.h"
37
38 static const char msg[] = "Michael Gilfix was here\341\210\264\r\n";
39 static const unsigned msglen = ARRAY_SIZE(msg) - 1;
40 static unsigned char buff[25];
41 static const int bufflen = ARRAY_SIZE(buff);
42
43 static int sdr, sdw;
44
verify_recvmsg(void)45 static void verify_recvmsg(void)
46 {
47 struct sockaddr_in6 addr_init = {
48 .sin6_family = AF_INET6,
49 .sin6_port = htons(0),
50 .sin6_addr = IN6ADDR_LOOPBACK_INIT,
51 };
52 struct sockaddr_in6 addr_r, addr_w, addr_f;
53 socklen_t addrlen_r, addrlen_w;
54 struct iovec iov = {
55 .iov_base = buff,
56 .iov_len = sizeof(buff),
57 };
58 struct msghdr msghdr = {
59 .msg_name = &addr_f,
60 .msg_namelen = sizeof(addr_f),
61 .msg_iov = &iov,
62 .msg_iovlen = 1,
63 .msg_control = NULL,
64 .msg_controllen = 0,
65 .msg_flags = 0,
66 };
67 int R;
68
69 sdr = SAFE_SOCKET(PF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_IP);
70 SAFE_BIND(sdr, (struct sockaddr*)&addr_init, sizeof(addr_init));
71 addrlen_r = sizeof(addr_r);
72 SAFE_GETSOCKNAME(sdr, (struct sockaddr*)&addr_r, &addrlen_r);
73 sdw = SAFE_SOCKET(PF_INET6, SOCK_DGRAM|SOCK_CLOEXEC, IPPROTO_IP);
74 SAFE_BIND(sdw, (struct sockaddr*)&addr_init, sizeof(addr_init));
75 addrlen_w = sizeof(addr_w);
76 SAFE_GETSOCKNAME(sdw, (struct sockaddr*)&addr_w, &addrlen_w);
77
78 R = sendto(sdw, msg, msglen, 0, (struct sockaddr*)&addr_r, addrlen_r);
79 if (R < 0)
80 tst_brk(TBROK | TERRNO, "sendto()");
81
82 R = recvmsg(sdr, &msghdr, MSG_PEEK);
83 if (R < 0) {
84 tst_res(TFAIL | TERRNO, "recvmsg(..., MSG_PEEK)");
85 return;
86 }
87
88 tst_res(TINFO, "received %d bytes", R);
89
90 if ((R == bufflen) && !memcmp(msg, buff, R))
91 tst_res(TPASS, "recvmsg(..., MSG_PEEK) works fine");
92 else
93 tst_res(TPASS, "recvmsg(..., MSG_PEEK) failed");
94
95 SAFE_CLOSE(sdw);
96 SAFE_CLOSE(sdr);
97 }
98
cleanup(void)99 static void cleanup(void)
100 {
101 if (sdw > 0)
102 SAFE_CLOSE(sdw);
103
104 if (sdr > 0)
105 SAFE_CLOSE(sdr);
106 }
107
108 static struct tst_test test = {
109 .tid = "recvmsg02",
110 .min_kver = "2.6.27",
111 .test_all = verify_recvmsg,
112 .cleanup = cleanup,
113 };
114