1: /*************************************************************************
2: * (C) 2011 AITNET - Sofia/Bulgaria - <office@aitnet.org>
3: * by Michael Pounov <misho@elwix.org>
4: *
5: * $Author: misho $
6: * $Id: anshd.c,v 1.1.1.1.2.4 2011/10/13 16:08:52 misho Exp $
7: *
8: *************************************************************************
9: The ELWIX and AITNET software is distributed under the following
10: terms:
11:
12: All of the documentation and software included in the ELWIX and AITNET
13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
14:
15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
16: by Michael Pounov <misho@elwix.org>. All rights reserved.
17:
18: Redistribution and use in source and binary forms, with or without
19: modification, are permitted provided that the following conditions
20: are met:
21: 1. Redistributions of source code must retain the above copyright
22: notice, this list of conditions and the following disclaimer.
23: 2. Redistributions in binary form must reproduce the above copyright
24: notice, this list of conditions and the following disclaimer in the
25: documentation and/or other materials provided with the distribution.
26: 3. All advertising materials mentioning features or use of this software
27: must display the following acknowledgement:
28: This product includes software developed by Michael Pounov <misho@elwix.org>
29: ELWIX - Embedded LightWeight unIX and its contributors.
30: 4. Neither the name of AITNET nor the names of its contributors
31: may be used to endorse or promote products derived from this software
32: without specific prior written permission.
33:
34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37: ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44: SUCH DAMAGE.
45: */
46: #include "global.h"
47: #include "anshd.h"
48: #include "proc.h"
49:
50:
51: intptr_t Kill;
52: int Verbose;
53: u_int Crypted = 1;
54: proc_head_t pH;
55: int bpfLEN, Timeout, Daemon = 1;
56:
57: extern char compiled[], compiledby[], compilehost[];
58:
59: static void
60: Usage()
61: {
62: printf( " -= anshd =- ELWIX Layer2 remote management service\n"
63: "=== %s === %s@%s ===\n\n"
64: " Syntax: anshd [options]\n\n"
65: "\t-d <dev>\tBind to host interface, like 'em0' (default is first host interface)\n"
66: "\t-U <user>\tRun service with other user\n"
67: "\t-C <dir>\tRun service into chroot directory\n"
68: "\t-t <timeout>\tTimeout of login if no activity (default is 0 sec)\n"
69: "\t-u\t\tSwitch to unencrypted traffic between hosts\n"
70: "\t-b\t\tRun into batch mode (default is daemon mode)\n"
71: "\t-v\t\tVerbose (more -v, more verbosity ...)\n"
72: "\t-h\t\tThis help screen!\n"
73: "\n", compiled, compiledby, compilehost);
74: }
75:
76: static void
77: sig(int s)
78: {
79: int state;
80:
81: switch (s) {
82: case SIGHUP:
83: VERB(1) LOG("Got SIGHUP!\n");
84: break;
85: case SIGTERM:
86: Kill++;
87: VERB(1) LOG("Got SIGTERM!\n");
88: break;
89: case SIGPIPE:
90: VERB(1) LOG("Got SIGPIPE!\n");
91: break;
92: case SIGCHLD:
93: VERB(1) LOG("Got SIGCHLD!\n");
94: while (waitpid(-1, &state, WNOHANG) > 0);
95: break;
96: }
97: }
98:
99: static void *
100: hook_error(void *root, void *arg)
101: {
102: /* sched_root_task_t *r = root; */
103:
104: if (!root)
105: return (void*) -1;
106:
107: if (arg == (void*) EINTR)
108: return (void*) -1;
109:
110: return NULL;
111: }
112:
113: int
114: main(int argc, char **argv)
115: {
116: struct passwd *pass;
117: int fd, h = 0, uid = 0, gid = 0;
118: char ch, szUser[STRSIZ] = "root", szChroot[STRSIZ] = "/", szDev[STRSIZ] = { 0 };
119: struct sigaction sact;
120: sched_root_task_t *root = NULL;
121: struct tagProc *proc;
122:
123: Get1stEth(szDev, STRSIZ);
124:
125: while ((ch = getopt(argc, argv, "hvubt:d:U:C:")) != -1)
126: switch (ch) {
127: case 'U':
128: pass = getpwnam(optarg);
129: if (!pass) {
130: printf("Error:: User %s not found!\n", optarg);
131: return 1;
132: } else {
133: strlcpy(szUser, optarg, sizeof szUser);
134: uid = pass->pw_uid;
135: gid = pass->pw_gid;
136: }
137: endpwent();
138: break;
139: case 'C':
140: if (access(optarg, R_OK)) {
141: printf("Error:: in chroot %s #%d - %s\n", optarg, errno, strerror(errno));
142: return 1;
143: } else
144: strlcpy(szChroot, optarg, sizeof szChroot);
145: break;
146: case 't':
147: Timeout = abs(strtol(optarg, NULL, 0));
148: break;
149: case 'd':
150: strlcpy(szDev, optarg, sizeof szDev);
151: break;
152: case 'u':
153: Crypted ^= Crypted;
154: break;
155: case 'b':
156: Daemon ^= Daemon;
157: break;
158: case 'v':
159: Verbose++;
160: break;
161: case 'h':
162: default:
163: Usage();
164: return 1;
165: }
166: argc -= optind;
167: argv += optind;
168:
169: /* catch signals */
170: memset(&sact, 0, sizeof sact);
171: sigemptyset(&sact.sa_mask);
172: sact.sa_handler = sig;
173: sigaction(SIGPIPE, &sact, NULL);
174: sigaction(SIGCHLD, &sact, NULL);
175: sigaction(SIGTERM, &sact, NULL);
176: sigaction(SIGHUP, &sact, NULL);
177:
178: openlog("anshd", LOG_CONS | LOG_PID, LOG_DAEMON);
179:
180: if (Daemon) {
181: switch (fork()) {
182: case -1:
183: ERR("Daemon mode #%d - %s\n", errno, strerror(errno));
184: closelog();
185: return 1;
186: case 0:
187: VERB(1) LOG("Welcome to dark ...\n");
188:
189: setsid();
190:
191: fd = open("/dev/null", O_WRONLY);
192: if (fd) {
193: dup2(fd, STDIN_FILENO);
194: dup2(fd, STDOUT_FILENO);
195: dup2(fd, STDERR_FILENO);
196: if (fd > 2)
197: close(fd);
198: }
199: break;
200: default:
201: VERB(1) LOG("Going to shadow land ...\n");
202: closelog();
203: return 0;
204: }
205: }
206:
207: if (ioCreatePIDFile(PIDFILE_ANSHD, 42)) {
208: ERR("Error:: already started anshd service ...\n");
209: closelog();
210: return 1;
211: }
212:
213: h = PrepareL2(szDev, &bpfLEN);
214: if (h == -1) {
215: ERR("Error:: Descriptor not opened ... abort!\n");
216: unlink(PIDFILE_ANSHD);
217: closelog();
218: return 2;
219: }
220:
221: SLIST_INIT(&pH);
222: if (!(proc = InitProc(h, NULL, ANSH_ID, bpfLEN))) {
223: ERR("Error:: Not enough memory ...\n");
224: close(h);
225: unlink(PIDFILE_ANSHD);
226: closelog();
227: return 3;
228: }
229:
230: root = schedBegin();
231: if (!root) {
232: ERR("Scheduler not init #%d - %s\n", sched_GetErrno(), sched_GetError());
233: DestroyProc(ANSH_ID);
234: close(h);
235: unlink(PIDFILE_ANSHD);
236: closelog();
237: return 4;
238: } else
239: root->root_hooks.hook_root.error = hook_error;
240:
241: chdir("/");
242: chroot(szChroot);
243:
244: setgid(gid);
245: setuid(uid);
246:
247: if (schedRead(root, pktRx, (void*) ANSH_ID, h)) {
248: schedRun(root, &Kill);
249: } else
250: ERR("Failed to add reader task #%d - %s\n", sched_GetErrno(), sched_GetError());
251:
252: VERB(1) LOG("Finish process.");
253: schedEnd(&root);
254: DestroyProc(ANSH_ID);
255: close(h);
256: unlink(PIDFILE_ANSHD);
257: closelog();
258: return 0;
259: }
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