1: /*************************************************************************
2: * (C) 2011 AITNET - Sofia/Bulgaria - <office@aitnet.org>
3: * by Michael Pounov <misho@elwix.org>
4: *
5: * $Author: misho $
6: * $Id: daemon2.c,v 1.1.1.1.2.9 2011/10/14 12:07:01 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:
49:
50: void *
51: pktTx(sched_task_t *task)
52: {
53: struct tagProc *proc;
54: int wlen;
55: u_char *str;
56:
57: FTRACE(3);
58:
59: /* not found argument, drop data */
60: if (!(proc = TASK_ARG(task)))
61: return (void*) -1;
62:
63: if (Crypted) {
64: str = cryptBuffer(proc->proc_buf_[FD2NET], proc->proc_rlen_[FD2NET], Crypted);
65: if (str) {
66: memcpy(proc->proc_buf_[FD2NET], str, proc->proc_rlen_[FD2NET]);
67: free(str);
68: }
69: }
70:
71: if ((wlen = pktSend(TASK_FD(task), ++proc->proc_seq, proc->proc_flg, Crypted,
72: proc->proc_buf_[FD2NET], proc->proc_rlen_[FD2NET],
73: &proc->proc_ea)) != ANSH_FLG_ERR) {
74: proc->proc_flg = ANSH_FLG_OK;
75: proc->proc_rlen_[FD2NET] = 0;
76: }
77: VERB(5) LOG("Sended %d bytes", wlen);
78:
79: return NULL;
80: }
81:
82: void *
83: pktRx(sched_task_t *task)
84: {
85: u_char *buf, *str;
86: struct ether_header eth;
87: int rlen, n = 0;
88: struct tagProc *proc = NULL;
89: char ret;
90: u_short *b;
91: u_int seq;
92:
93: FTRACE(3);
94:
95: rlen = bpfLEN;
96: if (!(buf = malloc(rlen)))
97: goto end;
98: else
99: memset(buf, 0, rlen);
100:
101: if ((ret = pktRecv(TASK_FD(task), &seq, &Crypted, buf, &rlen, ð)) == ANSH_FLG_ERR)
102: goto end;
103: VERB(5) LOG("Received %d bytes", rlen);
104: if (!(ret & ANSH_FLG_CPOUT))
105: goto end;
106:
107: /* packet is ok find active session */
108: SLIST_FOREACH(proc, &pH, proc_next)
109: if (proc->proc_id == ntohs(eth.ether_type)) {
110: n = ANSH_CODE;
111: break;
112: }
113: /* not found in sessions, drop packet */
114: if (n != ANSH_CODE) {
115: proc = NULL;
116: goto end;
117: }
118:
119: if (Crypted) {
120: str = cryptBuffer(buf, rlen, Crypted);
121: if (str) {
122: memcpy(buf, str, rlen);
123: free(str);
124: }
125: }
126:
127: switch (ret) {
128: case ANSH_FLG_EOF:
129: case ANSH_FLG_CPOUT:
130: if (seq <= proc->proc_seq)
131: goto end;
132: else if (seq > (proc->proc_seq + 1))
133: LOG("LOST PACKET(s) detect: %d; received seq=%d - %d",
134: seq - proc->proc_seq + 1, seq, proc->proc_seq);
135: proc->proc_seq = seq;
136: break;
137: case ANSH_FLG_WINZ:
138: b = (u_short*) buf;
139: ioChgWinPTY(proc->proc_pty, ntohs(b[0]), ntohs(b[1]), ntohs(b[2]), ntohs(b[3]));
140: /* if not started login, lets start & go! */
141: if (!proc->proc_pid) {
142: memcpy(&proc->proc_ea, ð.ether_shost, ETHER_ADDR_LEN);
143: spawnLogin(task, proc);
144: }
145: default:
146: goto end;
147: }
148:
149: proc->proc_flg = ret;
150: proc->proc_rlen_[NET2FD] = rlen;
151: memset(proc->proc_buf_[NET2FD], 0, proc->proc_blen);
152: memcpy(proc->proc_buf_[NET2FD], buf, proc->proc_rlen_[NET2FD]);
153: schedWrite(TASK_ROOT(task), fdTx, proc, proc->proc_pty);
154: end:
155: free(buf);
156: schedRead(TASK_ROOT(task), pktRx, NULL, proc ? proc->proc_sock : TASK_FD(task));
157: return NULL;
158: }
159:
160: void *
161: fdTx(sched_task_t *task)
162: {
163: struct tagProc *proc;
164: struct timeval tv = { 0 };
165: int wlen;
166:
167: FTRACE(3);
168:
169: /* not found argument, drop data */
170: if (!(proc = TASK_ARG(task)))
171: return (void*) -1;
172:
173: /* if != ANSH_FLG_CPOUT isnt received from client */
174: if (proc->proc_flg != ANSH_FLG_CPOUT || !proc->proc_pid)
175: return NULL;
176:
177: /* if Timeout defined, disarm timer */
178: if (Timeout)
179: schedCancelby(TASK_ROOT(task), &TASK_ROOT(task)->root_timer, CRITERIA_CALL, TOfunc, NULL);
180:
181: wlen = write(TASK_FD(task), proc->proc_buf_[NET2FD], proc->proc_rlen_[NET2FD]);
182: switch (wlen) {
183: case -1:
184: ERR("write2tty #%d - %s", errno, strerror(errno));
185: /* exit from shell and release tty */
186: return NULL;
187: default:
188: proc->proc_flg = ANSH_FLG_OK;
189: proc->proc_rlen_[NET2FD] = 0;
190: }
191: VERB(3) LOG("Writed %d bytes - %s", wlen, proc->proc_buf_[NET2FD]);
192:
193: /* if Timeout defined, go arm timer */
194: if (Timeout) {
195: tv.tv_sec = Timeout;
196: schedTimer(TASK_ROOT(task), TOfunc, proc, tv);
197: }
198: return NULL;
199: }
200:
201: void *
202: fdRx(sched_task_t *task)
203: {
204: struct tagProc *proc;
205: struct timeval tv = { 0 };
206: int rlen;
207:
208: FTRACE(3);
209:
210: /* not found argument, drop data */
211: if (!(proc = TASK_ARG(task)))
212: return (void*) -1;
213: if (!proc->proc_pid)
214: return NULL;
215:
216: /* if Timeout defined, disarm timer */
217: if (Timeout)
218: schedCancelby(TASK_ROOT(task), &TASK_ROOT(task)->root_timer, CRITERIA_CALL, TOfunc, NULL);
219:
220: memset(proc->proc_buf_[FD2NET], 0, proc->proc_blen);
221: rlen = read(TASK_FD(task), proc->proc_buf_[FD2NET],
222: proc->proc_blen - ETHER_HDR_LEN + sizeof(struct ansh_hdr));
223: switch (rlen) {
224: case -1:
225: ERR("readtty #%d - %s", errno, strerror(errno));
226: case 0:
227: /* exit from shell and release tty */
228: return NULL;
229: default:
230: proc->proc_flg = ANSH_FLG_OK;
231: proc->proc_rlen_[FD2NET] = rlen;
232: }
233: VERB(3) LOG("Readed %d bytes - %s", rlen, proc->proc_buf_[FD2NET]);
234:
235: schedCallOnce(TASK_ROOT(task), pktTx, proc, proc->proc_sock);
236: schedRead(TASK_ROOT(task), fdRx, proc, proc->proc_pty);
237:
238: /* if Timeout defined, go arm timer */
239: if (Timeout) {
240: tv.tv_sec = Timeout;
241: schedTimer(TASK_ROOT(task), TOfunc, proc, tv);
242: }
243: return NULL;
244: }
245:
246: int
247: spawnLogin(sched_task_t *task, struct tagProc *proc)
248: {
249: int flg;
250: struct timeval tv = { 0 };
251: char str[STRSIZ] = { 0 };
252:
253: FTRACE(3);
254:
255: assert(proc);
256:
257: switch ((proc->proc_pid = ioForkPTY(&proc->proc_pty, proc->proc_ttyname,
258: sizeof proc->proc_ttyname, NULL, NULL, NULL))) {
259: case -1:
260: ERR("ioForkPTY() #%d - %s", io_GetErrno(), io_GetError());
261: return -1;
262: case 0:
263: printf("anshd ELWIX remote management system (%s)\n\n", proc->proc_ttyname);
264: strlcpy(str, "-hansh@", sizeof str);
265: io_ether_ntoa((const struct io_ether_addr*) &proc->proc_ea, str + 7, 18);
266:
267: execl("/usr/bin/login", "login", str, NULL);
268: /* never reached */
269: return -1;
270: default:
271: flg = fcntl(proc->proc_pty, F_GETFL);
272: fcntl(proc->proc_pty, F_SETFL, flg | O_NONBLOCK);
273:
274: VERB(3) LOG("Parent know child pid %d", proc->proc_pid);
275: schedRead(TASK_ROOT(task), fdRx, proc, proc->proc_pty);
276:
277: /* if Timeout defined, go arm timer */
278: if (Timeout) {
279: tv.tv_sec = Timeout;
280: schedTimer(TASK_ROOT(task), TOfunc, proc, tv);
281: }
282: break;
283: }
284:
285: return 0;
286: }
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