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/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <sys/types.h>
31 #include <sys/socket.h>
32 #include <sys/un.h>
33 #include <inttypes.h>
34 #include <stdarg.h>
35 #include <stdbool.h>
36 #include <stdlib.h>
37 
38 #include "uc_common.h"
39 #include "t_generic.h"
40 #include "t_cmsgcred.h"
41 
42 int
43 t_cmsgcred_client(int fd)
44 {
45 	struct msghdr msghdr;
46 	struct iovec iov[1];
47 	void *cmsg_data;
48 	size_t cmsg_size;
49 	int rv;
50 
51 	if (uc_sync_recv() < 0)
52 		return (-2);
53 
54 	rv = -2;
55 
56 	cmsg_size = CMSG_SPACE(sizeof(struct cmsgcred));
57 	cmsg_data = malloc(cmsg_size);
58 	if (cmsg_data == NULL) {
59 		uc_logmsg("malloc");
60 		goto done;
61 	}
62 	uc_msghdr_init_client(&msghdr, iov, cmsg_data, cmsg_size,
63 	    SCM_CREDS, sizeof(struct cmsgcred));
64 
65 	if (uc_socket_connect(fd) < 0)
66 		goto done;
67 
68 	if (uc_message_sendn(fd, &msghdr) < 0)
69 		goto done;
70 
71 	rv = 0;
72 done:
73 	free(cmsg_data);
74 	return (rv);
75 }
76 
77 static int
78 t_cmsgcred_server(int fd1)
79 {
80 	struct msghdr msghdr;
81 	struct iovec iov[1];
82 	struct cmsghdr *cmsghdr;
83 	void *cmsg_data;
84 	size_t cmsg_size;
85 	u_int i;
86 	int fd2, rv;
87 
88 	if (uc_sync_send() < 0)
89 		return (-2);
90 
91 	fd2 = -1;
92 	rv = -2;
93 
94 	cmsg_size = CMSG_SPACE(sizeof(struct cmsgcred));
95 	cmsg_data = malloc(cmsg_size);
96 	if (cmsg_data == NULL) {
97 		uc_logmsg("malloc");
98 		goto done;
99 	}
100 
101 	if (uc_cfg.sock_type == SOCK_STREAM) {
102 		fd2 = uc_socket_accept(fd1);
103 		if (fd2 < 0)
104 			goto done;
105 	} else
106 		fd2 = fd1;
107 
108 	rv = -1;
109 	for (i = 1; i <= uc_cfg.ipc_msg.msg_num; ++i) {
110 		uc_dbgmsg("message #%u", i);
111 
112 		uc_msghdr_init_server(&msghdr, iov, cmsg_data, cmsg_size);
113 		if (uc_message_recv(fd2, &msghdr) < 0) {
114 			rv = -2;
115 			break;
116 		}
117 
118 		if (uc_check_msghdr(&msghdr, sizeof(*cmsghdr)) < 0)
119 			break;
120 
121 		cmsghdr = CMSG_FIRSTHDR(&msghdr);
122 		if (uc_check_scm_creds_cmsgcred(cmsghdr) < 0)
123 			break;
124 	}
125 	if (i > uc_cfg.ipc_msg.msg_num)
126 		rv = 0;
127 done:
128 	free(cmsg_data);
129 	if (uc_cfg.sock_type == SOCK_STREAM && fd2 >= 0)
130 		if (uc_socket_close(fd2) < 0)
131 			rv = -2;
132 	return (rv);
133 }
134 
135 int
136 t_cmsgcred(void)
137 {
138 	return (t_generic(t_cmsgcred_client, t_cmsgcred_server));
139 }
140