1: /*************************************************************************
2: * (C) 2011 AITNET - Sofia/Bulgaria - <office@aitnet.org>
3: * by Michael Pounov <misho@elwix.org>
4: *
5: * $Author: misho $
6: * $Id: daemon3.c,v 1.5 2015/05/19 23:25:30 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, 2013
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: icmpTx(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: e_free(str);
68: }
69: }
70:
71: if ((wlen = icmpSend(TASK_FD(task), ++proc->proc_seq, proc->proc_id, proc->proc_flg, Crypted,
72: proc->proc_buf_[FD2NET], proc->proc_rlen_[FD2NET], &proc->proc_cli,
73: sizeof proc->proc_cli)) != 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: icmpRx(sched_task_t *task)
84: {
85: u_char *buf, *str;
86: sockaddr_t sa;
87: int rlen, n = 0, salen = sizeof sa;
88: struct tagProc *proc = NULL;
89: char ret;
90: u_short id, *b;
91: u_int seq;
92:
93: FTRACE(3);
94:
95: rlen = bpfLEN;
96: if (!(buf = e_malloc(rlen)))
97: goto end;
98: else
99: memset(buf, 0, rlen);
100:
101: if ((ret = icmpRecv(TASK_FD(task), &seq, &id, &Crypted, buf, &rlen, &sa,
102: (socklen_t *) &salen)) == ANSH_FLG_ERR)
103: goto end;
104: VERB(5) LOG("Received %d bytes %d", rlen, seq);
105: if (!(ret & ANSH_FLG_CPOUT))
106: goto end;
107:
108: /* packet is ok find active session */
109: SLIST_FOREACH(proc, &pH, proc_next)
110: if (proc->proc_id == id) {
111: n = ANSH_CODE;
112: break;
113: }
114: /* not found in sessions, drop packet */
115: if (n != ANSH_CODE) {
116: proc = NULL;
117: goto end;
118: }
119:
120: if (Crypted) {
121: str = cryptBuffer(buf, rlen, Crypted);
122: if (str) {
123: memcpy(buf, str, rlen);
124: e_free(str);
125: }
126: }
127:
128: switch (ret) {
129: case ANSH_FLG_EOF:
130: case ANSH_FLG_CPOUT:
131: if (seq <= proc->proc_seq)
132: goto end;
133: else if (seq > (proc->proc_seq + 1))
134: LOG("LOST PACKET(s) detect: %d; received seq=%d - %d",
135: seq - proc->proc_seq + 1, seq, proc->proc_seq);
136: proc->proc_seq = seq;
137: break;
138: case ANSH_FLG_WINZ:
139: b = (u_short*) buf;
140: ioChgWinPTY(proc->proc_pty, ntohs(b[0]), ntohs(b[1]), ntohs(b[2]), ntohs(b[3]));
141: /* if not started login, lets start & go! */
142: if (!proc->proc_pid) {
143: memcpy(&proc->proc_cli, &sa, sizeof sa);
144: spawnLogin(task, proc);
145: }
146: default:
147: goto end;
148: }
149:
150: proc->proc_flg = ret;
151: proc->proc_rlen_[NET2FD] = rlen;
152: memset(proc->proc_buf_[NET2FD], 0, proc->proc_blen);
153: memcpy(proc->proc_buf_[NET2FD], buf, proc->proc_rlen_[NET2FD]);
154: schedWrite(TASK_ROOT(task), fdTx, proc, proc->proc_pty, NULL, 0);
155: end:
156: e_free(buf);
157: schedRead(TASK_ROOT(task), icmpRx, NULL, proc ? proc->proc_sock : TASK_FD(task), NULL, 0);
158: return NULL;
159: }
160:
161: void *
162: fdTx(sched_task_t *task)
163: {
164: struct tagProc *proc;
165: struct timespec ts = { 0 };
166: int wlen;
167:
168: FTRACE(3);
169:
170: /* not found argument, drop data */
171: if (!(proc = TASK_ARG(task)))
172: return (void*) -1;
173:
174: /* if != ANSH_FLG_CPOUT isnt received from client */
175: if (proc->proc_flg != ANSH_FLG_CPOUT || !proc->proc_pid)
176: return NULL;
177:
178: /* if Timeout defined, disarm timer */
179: if (Timeout)
180: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL, TOfunc, NULL);
181:
182: wlen = write(TASK_FD(task), proc->proc_buf_[NET2FD], proc->proc_rlen_[NET2FD]);
183: switch (wlen) {
184: case -1:
185: ERR("write2tty #%d - %s", errno, strerror(errno));
186: /* exit from shell and release tty */
187: return NULL;
188: default:
189: proc->proc_flg = ANSH_FLG_OK;
190: proc->proc_rlen_[NET2FD] = 0;
191: }
192: VERB(3) LOG("Writed %d bytes - %s", wlen, proc->proc_buf_[NET2FD]);
193:
194: /* if Timeout defined, go arm timer */
195: if (Timeout) {
196: ts.tv_sec = Timeout;
197: schedTimer(TASK_ROOT(task), TOfunc, proc, ts, NULL, 0);
198: }
199: return NULL;
200: }
201:
202: void *
203: fdRx(sched_task_t *task)
204: {
205: struct tagProc *proc;
206: struct timespec ts = { 0 };
207: int rlen;
208:
209: FTRACE(3);
210:
211: /* not found argument, drop data */
212: if (!(proc = TASK_ARG(task)))
213: return (void*) -1;
214: if (!proc->proc_pid)
215: return NULL;
216:
217: /* if Timeout defined, disarm timer */
218: if (Timeout)
219: schedCancelby(TASK_ROOT(task), taskTIMER, CRITERIA_CALL, TOfunc, NULL);
220:
221: memset(proc->proc_buf_[FD2NET], 0, proc->proc_blen);
222: rlen = read(TASK_FD(task), proc->proc_buf_[FD2NET],
223: proc->proc_blen - sizeof(struct icmp) + sizeof(struct ansh_hdr));
224: switch (rlen) {
225: case -1:
226: ERR("readtty #%d - %s", errno, strerror(errno));
227: case 0:
228: /* exit from shell and release tty */
229: return NULL;
230: default:
231: proc->proc_flg = ANSH_FLG_OK;
232: proc->proc_rlen_[FD2NET] = rlen;
233: }
234: VERB(3) LOG("Readed %d bytes - %s", rlen, proc->proc_buf_[FD2NET]);
235:
236: schedWrite(TASK_ROOT(task), icmpTx, proc, proc->proc_sock, NULL, 0);
237: schedRead(TASK_ROOT(task), fdRx, proc, proc->proc_pty, NULL, 0);
238:
239: /* if Timeout defined, go arm timer */
240: if (Timeout) {
241: ts.tv_sec = Timeout;
242: schedTimer(TASK_ROOT(task), TOfunc, proc, ts, NULL, 0);
243: }
244: return NULL;
245: }
246:
247: int
248: spawnLogin(sched_task_t *task, struct tagProc *proc)
249: {
250: int flg;
251: struct timespec ts = { 0 };
252: char str[STRSIZ] = { 0 };
253:
254: FTRACE(3);
255:
256: assert(proc);
257:
258: switch ((proc->proc_pid = ioForkPTY(&proc->proc_pty, proc->proc_ttyname,
259: sizeof proc->proc_ttyname, NULL, NULL, NULL))) {
260: case -1:
261: ERR("ioForkPTY() #%d - %s", io_GetErrno(), io_GetError());
262: return -1;
263: case 0:
264: printf("ansh3d ELWIX remote management system over ICMP (%s)\n\n",
265: proc->proc_ttyname);
266: strlcpy(str, "-hansh3@", sizeof str);
267: if (proc->proc_cli.sa.sa_family == AF_INET)
268: inet_ntop(AF_INET, &proc->proc_cli.sin.sin_addr, str + 8, INET_ADDRSTRLEN);
269: else if (proc->proc_cli.sa.sa_family == AF_INET6)
270: inet_ntop(AF_INET6, &proc->proc_cli.sin6.sin6_addr, str + 8, INET6_ADDRSTRLEN);
271: execl("/usr/bin/login", "login", str, NULL);
272: /* never reached */
273: return -1;
274: default:
275: flg = fcntl(proc->proc_pty, F_GETFL);
276: fcntl(proc->proc_pty, F_SETFL, flg | O_NONBLOCK);
277:
278: VERB(3) LOG("Parent know child pid %d", proc->proc_pid);
279: schedRead(TASK_ROOT(task), fdRx, proc, proc->proc_pty, NULL, 0);
280:
281: /* if Timeout defined, go arm timer */
282: if (Timeout) {
283: ts.tv_sec = Timeout;
284: schedTimer(TASK_ROOT(task), TOfunc, proc, ts, NULL, 0);
285: }
286: break;
287: }
288:
289: return 0;
290: }
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