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