1 /* $OpenBSD: mopd.c,v 1.19 2015/02/09 23:00:14 deraadt Exp $ */
2
3 /*
4 * Copyright (c) 1993-96 Mats O Jansson. All rights reserved.
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 THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 /*
28 * mopd - MOP Dump/Load Daemon
29 *
30 * Usage: mopd [-3 | -4] [-adfv] interface
31 */
32
33 #include "os.h"
34 #include "common/common.h"
35 #include "common/mopdef.h"
36 #include "common/device.h"
37 #include "common/print.h"
38 #include "common/pf.h"
39 #include "common/cmp.h"
40 #include "common/get.h"
41 #include "common/dl.h"
42 #include "common/rc.h"
43 #include "process.h"
44
45 #include "pwd.h"
46
47 /*
48 * The list of all interfaces that are being listened to.
49 * "selects" on the descriptors in this list.
50 */
51 struct if_info *iflist;
52
53 void Usage(void);
54 void mopProcess(struct if_info *, u_char *);
55
56 int AllFlag = 0; /* listen on "all" interfaces */
57 int DebugFlag = 0; /* print debugging messages */
58 int ForegroundFlag = 0; /* run in foreground */
59 int VersionFlag = 0; /* print version */
60 int Not3Flag = 0; /* Not MOP V3 messages. */
61 int Not4Flag = 0; /* Not MOP V4 messages. */
62 int promisc = 1; /* Need promisc mode */
63
64 extern char *__progname;
65
66 int
main(int argc,char * argv[])67 main(int argc, char *argv[])
68 {
69 int c;
70 char *interface;
71 struct passwd *pw;
72
73 extern char version[];
74
75 while ((c = getopt(argc, argv, "34adfv")) != -1)
76 switch (c) {
77 case '3':
78 Not3Flag = 1;
79 break;
80 case '4':
81 Not4Flag = 1;
82 break;
83 case 'a':
84 AllFlag = 1;
85 break;
86 case 'd':
87 DebugFlag++;
88 break;
89 case 'f':
90 ForegroundFlag = 1;
91 break;
92 case 'v':
93 VersionFlag = 1;
94 break;
95 default:
96 Usage();
97 /* NOTREACHED */
98 }
99
100 if (VersionFlag) {
101 fprintf(stdout,"%s: version %s\n", __progname, version);
102 exit(0);
103 }
104
105 interface = argv[optind++];
106
107 if ((AllFlag && interface) || (!AllFlag && interface == 0) ||
108 (argc > optind) || (Not3Flag && Not4Flag))
109 Usage();
110
111 /* All error reporting is done through syslogs. */
112 openlog(__progname, LOG_PID | LOG_CONS, LOG_DAEMON);
113 tzset();
114
115 if ((pw = getpwnam("_mopd")) == NULL)
116 err(1, "getpwnam");
117
118 if ((!ForegroundFlag) && DebugFlag)
119 fprintf(stdout, "%s: not running as daemon, -d given.\n",
120 __progname);
121
122 if ((!ForegroundFlag) && (!DebugFlag))
123 if (daemon(0, 0) == -1)
124 err(1, NULL);
125
126 syslog(LOG_INFO, "%s %s started.", __progname, version);
127
128 if (AllFlag)
129 deviceInitAll();
130 else
131 deviceInitOne(interface);
132
133 if (chroot(MOP_FILE_PATH) == -1) {
134 syslog(LOG_CRIT, "chroot %s: %m", MOP_FILE_PATH);
135 exit(1);
136 }
137 if (chdir("/") == -1) {
138 syslog(LOG_CRIT, "chdir(\"/\"): %m");
139 exit(1);
140 }
141 if (setgroups(1, &pw->pw_gid) ||
142 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
143 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) {
144 syslog(LOG_CRIT, "can't drop privileges: %m");
145 exit(1);
146 }
147 endpwent();
148
149 Loop();
150 /* NOTREACHED */
151 }
152
153 void
Usage()154 Usage()
155 {
156 fprintf(stderr, "usage: %s [-3 | -4] [-adfv] interface\n",
157 __progname);
158 exit(1);
159 }
160
161 /*
162 * Process incoming packages.
163 */
164 void
mopProcess(struct if_info * ii,u_char * pkt)165 mopProcess(struct if_info *ii, u_char *pkt)
166 {
167 u_char *dst, *src;
168 u_short ptype;
169 int idx, trans, len;
170
171 /* We don't known with transport, Guess! */
172 trans = mopGetTrans(pkt, 0);
173
174 /* Ok, return if we don't wan't this message */
175 if ((trans == TRANS_ETHER) && Not3Flag) return;
176 if ((trans == TRANS_8023) && Not4Flag) return;
177
178 idx = 0;
179 mopGetHeader(pkt, &idx, &dst, &src, &ptype, &len, trans);
180
181 /*
182 * Ignore our own transmissions
183 *
184 */
185 if (mopCmpEAddr(ii->eaddr,src) == 0)
186 return;
187
188 switch (ptype) {
189 case MOP_K_PROTO_DL:
190 mopProcessDL(stdout, ii, pkt, &idx, dst, src, trans, len);
191 break;
192 case MOP_K_PROTO_RC:
193 mopProcessRC(stdout, ii, pkt, &idx, dst, src, trans, len);
194 break;
195 default:
196 break;
197 }
198 }
199