Annotation of ansh/src/daemon3.c, revision 1.1.1.1.2.6
1.1 misho 1: /*************************************************************************
2: * (C) 2011 AITNET - Sofia/Bulgaria - <office@aitnet.org>
3: * by Michael Pounov <misho@elwix.org>
4: *
5: * $Author: misho $
1.1.1.1.2.6! misho 6: * $Id: daemon3.c,v 1.1.1.1.2.5 2011/10/13 15:24:17 misho Exp $
1.1 misho 7: *
1.1.1.1.2.6! misho 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: */
1.1 misho 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;
1.1.1.1.2.1 misho 55: u_char *str;
1.1 misho 56:
57: FTRACE(3);
58:
59: /* not found argument, drop data */
60: if (!(proc = TASK_ARG(task)))
61: return (void*) -1;
62:
1.1.1.1.2.1 misho 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:
1.1.1.1.2.4 misho 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) {
1.1 misho 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: {
1.1.1.1.2.1 misho 85: u_char *buf, *str;
1.1 misho 86: struct sockaddr sa;
87: int rlen, n = 0, salen = sizeof sa;
88: struct tagProc *proc = NULL;
89: char ret;
90: u_short id, *b;
1.1.1.1.2.4 misho 91: u_int seq;
1.1 misho 92:
93: FTRACE(3);
94:
95: rlen = bpfLEN;
96: if (!(buf = malloc(rlen)))
97: goto end;
1.1.1.1.2.5 misho 98: else
99: memset(buf, 0, rlen);
1.1 misho 100:
1.1.1.1.2.4 misho 101: if ((ret = icmpRecv(TASK_FD(task), &seq, &id, &Crypted, buf, &rlen, &sa,
102: (socklen_t *) &salen)) == ANSH_FLG_ERR)
1.1 misho 103: goto end;
1.1.1.1.2.4 misho 104: VERB(5) LOG("Received %d bytes %d", rlen, seq);
1.1 misho 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:
1.1.1.1.2.1 misho 120: if (Crypted) {
121: str = cryptBuffer(buf, rlen, Crypted);
122: if (str) {
123: memcpy(buf, str, rlen);
124: free(str);
125: }
126: }
127:
1.1 misho 128: switch (ret) {
129: case ANSH_FLG_EOF:
130: case ANSH_FLG_CPOUT:
1.1.1.1.2.4 misho 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;
1.1 misho 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);
155: end:
156: free(buf);
157: schedRead(TASK_ROOT(task), icmpRx, NULL, proc ? proc->proc_sock : TASK_FD(task));
158: return NULL;
159: }
160:
161: void *
162: fdTx(sched_task_t *task)
163: {
164: struct tagProc *proc;
165: struct timeval tv = { 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 (waitpid(proc->proc_pid, &wlen, WNOHANG)) {
179: ioFreePTY(TASK_FD(task), proc->proc_ttyname);
180: schedCancelby(TASK_ROOT(task), NULL, CRITERIA_FD, (void*) TASK_FD(task), NULL);
181:
182: proc->proc_pid = 0;
1.1.1.1.2.4 misho 183: proc->proc_seq = 0;
1.1 misho 184: proc->proc_flg = ANSH_FLG_EOF;
185: proc->proc_rlen_[FD2NET] = 0;
186:
187: schedWrite(TASK_ROOT(task), icmpTx, proc, proc->proc_sock);
188: return NULL;
189: }
190:
191: /* if Timeout defined, disarm timer */
192: if (Timeout)
193: schedCancelby(TASK_ROOT(task), &TASK_ROOT(task)->root_timer, CRITERIA_CALL, TOfunc, NULL);
194:
195: wlen = write(TASK_FD(task), proc->proc_buf_[NET2FD], proc->proc_rlen_[NET2FD]);
196: switch (wlen) {
197: case -1:
198: ERR("write2tty #%d - %s", errno, strerror(errno));
199: /* exit from shell and release tty */
200: waitpid(proc->proc_pid, &wlen, 0);
201: ioFreePTY(TASK_FD(task), proc->proc_ttyname);
202: schedCancelby(TASK_ROOT(task), NULL, CRITERIA_FD, (void*) TASK_FD(task), NULL);
203:
204: proc->proc_pid = 0;
1.1.1.1.2.4 misho 205: proc->proc_seq = 0;
1.1 misho 206: proc->proc_flg = ANSH_FLG_EOF;
207: proc->proc_rlen_[FD2NET] = 0;
208:
209: schedWrite(TASK_ROOT(task), icmpTx, proc, proc->proc_sock);
210: return NULL;
211: default:
212: proc->proc_flg = ANSH_FLG_OK;
213: proc->proc_rlen_[NET2FD] = 0;
214: }
215: VERB(3) LOG("Writed %d bytes - %s", wlen, proc->proc_buf_[NET2FD]);
216:
217: /* if Timeout defined, go arm timer */
218: if (Timeout) {
219: tv.tv_sec = Timeout;
220: schedTimer(TASK_ROOT(task), TOfunc, proc, tv);
221: }
222: return NULL;
223: }
224:
225: void *
226: fdRx(sched_task_t *task)
227: {
228: struct tagProc *proc;
229: struct timeval tv = { 0 };
230: int rlen;
231:
232: FTRACE(3);
233:
234: /* not found argument, drop data */
235: if (!(proc = TASK_ARG(task)))
236: return (void*) -1;
237: if (!proc->proc_pid)
238: return NULL;
239:
240: if (waitpid(proc->proc_pid, &rlen, WNOHANG)) {
241: ioFreePTY(TASK_FD(task), proc->proc_ttyname);
242: schedCancelby(TASK_ROOT(task), NULL, CRITERIA_FD, (void*) TASK_FD(task), NULL);
243:
244: proc->proc_pid = 0;
1.1.1.1.2.4 misho 245: proc->proc_seq = 0;
1.1 misho 246: proc->proc_flg = ANSH_FLG_EOF;
247: proc->proc_rlen_[FD2NET] = 0;
248:
249: schedWrite(TASK_ROOT(task), icmpTx, proc, proc->proc_sock);
250: return NULL;
251: }
252:
253: /* if Timeout defined, disarm timer */
254: if (Timeout)
255: schedCancelby(TASK_ROOT(task), &TASK_ROOT(task)->root_timer, CRITERIA_CALL, TOfunc, NULL);
256:
257: memset(proc->proc_buf_[FD2NET], 0, proc->proc_blen);
1.1.1.1.2.3 misho 258: rlen = read(TASK_FD(task), proc->proc_buf_[FD2NET],
259: proc->proc_blen - sizeof(struct icmp) + sizeof(struct ansh_hdr));
1.1 misho 260: switch (rlen) {
261: case -1:
262: ERR("readtty #%d - %s", errno, strerror(errno));
263: case 0:
264: /* exit from shell and release tty */
265: waitpid(proc->proc_pid, &rlen, 0);
266: ioFreePTY(TASK_FD(task), proc->proc_ttyname);
267: schedCancelby(TASK_ROOT(task), NULL, CRITERIA_FD, (void*) TASK_FD(task), NULL);
268: VERB(3) LOG("EOF process status %d", rlen);
269:
270: proc->proc_pid = 0;
1.1.1.1.2.4 misho 271: proc->proc_seq = 0;
1.1 misho 272: proc->proc_flg = ANSH_FLG_EOF;
273: proc->proc_rlen_[FD2NET] = 0;
274:
275: schedWrite(TASK_ROOT(task), icmpTx, proc, proc->proc_sock);
276: return NULL;
277: default:
278: proc->proc_flg = ANSH_FLG_OK;
279: proc->proc_rlen_[FD2NET] = rlen;
280: }
281: VERB(3) LOG("Readed %d bytes - %s", rlen, proc->proc_buf_[FD2NET]);
282:
283: schedWrite(TASK_ROOT(task), icmpTx, proc, proc->proc_sock);
284: schedRead(TASK_ROOT(task), fdRx, proc, proc->proc_pty);
285:
286: /* if Timeout defined, go arm timer */
287: if (Timeout) {
288: tv.tv_sec = Timeout;
289: schedTimer(TASK_ROOT(task), TOfunc, proc, tv);
290: }
291: return NULL;
292: }
293:
294: int
295: spawnLogin(sched_task_t *task, struct tagProc *proc)
296: {
297: int flg;
298: struct timeval tv = { 0 };
299: char str[STRSIZ] = { 0 };
300: struct sockaddr_in *sin;
301: struct sockaddr_in6 *sin6;
302:
303: FTRACE(3);
304:
305: assert(proc);
306:
307: switch ((proc->proc_pid = ioForkPTY(&proc->proc_pty, proc->proc_ttyname,
308: sizeof proc->proc_ttyname, NULL, NULL, NULL))) {
309: case -1:
310: ERR("ioForkPTY() #%d - %s", io_GetErrno(), io_GetError());
311: return -1;
312: case 0:
313: printf("ansh3d ELWIX remote management system over ICMP (%s)\n\n",
314: proc->proc_ttyname);
315: strlcpy(str, "-hansh3@", sizeof str);
316: if (proc->proc_cli.sa_family == AF_INET) {
317: sin = (struct sockaddr_in*) &proc->proc_cli;
318: inet_ntop(AF_INET, &sin->sin_addr, str + 8, INET_ADDRSTRLEN);
1.1.1.1.2.2 misho 319: } else if (proc->proc_cli.sa_family == AF_INET6) {
1.1 misho 320: sin6 = (struct sockaddr_in6*) &proc->proc_cli;
321: inet_ntop(AF_INET6, &sin6->sin6_addr, str + 8, INET6_ADDRSTRLEN);
322: }
323: execl("/usr/bin/login", "login", str, NULL);
324: /* never reached */
325: return -1;
326: default:
327: flg = fcntl(proc->proc_pty, F_GETFL);
328: fcntl(proc->proc_pty, F_SETFL, flg | O_NONBLOCK);
329:
330: VERB(3) LOG("Parent know child pid %d", proc->proc_pid);
331: schedRead(TASK_ROOT(task), fdRx, proc, proc->proc_pty);
332:
333: /* if Timeout defined, go arm timer */
334: if (Timeout) {
335: tv.tv_sec = Timeout;
336: schedTimer(TASK_ROOT(task), TOfunc, proc, tv);
337: }
338: break;
339: }
340:
341: return 0;
342: }
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