1 /*-
2 * Copyright (c) 2005 Andrey Simonenko
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/types.h>
28 #include <sys/socket.h>
29 #include <sys/un.h>
30 #include <inttypes.h>
31 #include <errno.h>
32 #include <stdarg.h>
33 #include <stdbool.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37
38 #include "uc_common.h"
39 #include "t_generic.h"
40 #include "t_cmsg_len.h"
41
42 #ifndef __LP64__
43 static int
t_cmsg_len_client(int fd)44 t_cmsg_len_client(int fd)
45 {
46 struct msghdr msghdr;
47 struct iovec iov[1];
48 struct cmsghdr *cmsghdr;
49 void *cmsg_data;
50 size_t size, cmsg_size;
51 socklen_t socklen;
52 int rv;
53
54 if (uc_sync_recv() < 0)
55 return (-2);
56
57 rv = -2;
58
59 cmsg_size = CMSG_SPACE(sizeof(struct cmsgcred));
60 cmsg_data = malloc(cmsg_size);
61 if (cmsg_data == NULL) {
62 uc_logmsg("malloc");
63 goto done;
64 }
65 uc_msghdr_init_client(&msghdr, iov, cmsg_data, cmsg_size,
66 SCM_CREDS, sizeof(struct cmsgcred));
67 cmsghdr = CMSG_FIRSTHDR(&msghdr);
68
69 if (uc_socket_connect(fd) < 0)
70 goto done;
71
72 size = msghdr.msg_iov != NULL ? msghdr.msg_iov->iov_len : 0;
73 rv = -1;
74 for (socklen = 0; socklen < CMSG_LEN(0); ++socklen) {
75 cmsghdr->cmsg_len = socklen;
76 uc_dbgmsg("send: data size %zu", size);
77 uc_dbgmsg("send: msghdr.msg_controllen %u",
78 (u_int)msghdr.msg_controllen);
79 uc_dbgmsg("send: cmsghdr.cmsg_len %u",
80 (u_int)cmsghdr->cmsg_len);
81 if (sendmsg(fd, &msghdr, 0) < 0) {
82 uc_dbgmsg("sendmsg(2) failed: %s; retrying",
83 strerror(errno));
84 continue;
85 }
86 uc_logmsgx("sent message with cmsghdr.cmsg_len %u < %u",
87 (u_int)cmsghdr->cmsg_len, (u_int)CMSG_LEN(0));
88 break;
89 }
90 if (socklen == CMSG_LEN(0))
91 rv = 0;
92
93 if (uc_sync_send() < 0) {
94 rv = -2;
95 goto done;
96 }
97 done:
98 free(cmsg_data);
99 return (rv);
100 }
101
102 static int
t_cmsg_len_server(int fd1)103 t_cmsg_len_server(int fd1)
104 {
105 int fd2, rv;
106
107 if (uc_sync_send() < 0)
108 return (-2);
109
110 rv = -2;
111
112 if (uc_cfg.sock_type == SOCK_STREAM) {
113 fd2 = uc_socket_accept(fd1);
114 if (fd2 < 0)
115 goto done;
116 } else
117 fd2 = fd1;
118
119 if (uc_sync_recv() < 0)
120 goto done;
121
122 rv = 0;
123 done:
124 if (uc_cfg.sock_type == SOCK_STREAM && fd2 >= 0)
125 if (uc_socket_close(fd2) < 0)
126 rv = -2;
127 return (rv);
128 }
129
130 int
t_cmsg_len(void)131 t_cmsg_len(void)
132 {
133 return (t_generic(t_cmsg_len_client, t_cmsg_len_server));
134 }
135 #endif
136