Annotation of libaitio/src/pty.c, revision 1.1.2.12
1.1.2.1 misho 1: /*************************************************************************
2: * (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
3: * by Michael Pounov <misho@openbsd-bg.org>
4: *
5: * $Author: misho $
1.1.2.12! misho 6: * $Id: pty.c,v 1.1.2.11 2011/09/30 13:46:26 misho Exp $
1.1.2.1 misho 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:
48:
49: /*
1.1.2.3 misho 50: * ioAllocPTY() Allocate new PTY and TTY
1.1.2.1 misho 51: * @ptyfd = master fd, pty
52: * @ttyfd = slave fd, tty
53: * @name = tty device name if not null
54: * @namesiz = name length, must be above 63 bytes.
55: * @term = termios for terminal
56: * @winz = winsize for terminal
57: * return: -1 error or 0 ok
58: */
59: inline int
60: ioAllocPTY(int *ptyfd, int *ttyfd, char * __restrict name, int namesiz,
61: struct termios * __restrict term, struct winsize * __restrict winz)
62: {
63: assert(ptyfd && ttyfd);
64: if (!ptyfd || !ttyfd || (name && namesiz < 64)) {
65: io_SetErr(EINVAL, "Error:: invalid arguments ...");
66: return -1;
67: }
68:
69: memset(name, 0, namesiz);
70: if (openpty(ptyfd, ttyfd, name, term, winz) == -1) {
71: LOGERR;
72: return -1;
73: }
74:
75: return 0;
76: }
77:
78: /*
1.1.2.8 misho 79: * ioFreePTY() Release PTY and TTY device
80: * @ptyfd = master fd, pty (==-1 skip closing pty)
1.1.2.1 misho 81: * @ttyname = tty filename
82: * return: none
83: */
84: inline void
1.1.2.8 misho 85: ioFreePTY(int ptyfd, const char *ttyname)
1.1.2.1 misho 86: {
87: assert(ttyname);
88: if (!ttyname)
89: return;
90:
1.1.2.8 misho 91: if (ptyfd != -1)
92: close(ptyfd);
1.1.2.12! misho 93: if (ttyname) {
! 94: chown(ttyname, (uid_t) 0, (gid_t) 0);
! 95: chmod(ttyname, (mode_t) 0666);
! 96: }
1.1.2.1 misho 97: }
1.1.2.2 misho 98:
99: /*
100: * ioChgWinPTY() Change window size of PTY
101: * @ptyfd = master fd, pty
102: * @row = row
103: * @col = col
104: * @xpxl = x pixels
105: * @ypxl = y pixels
106: * return: -1 error or 0 ok
107: */
108: inline int
109: ioChgWinPTY(int ptyfd, u_short row, u_short col, u_short xpxl, u_short ypxl)
110: {
111: struct winsize w;
112:
113: w.ws_row = row;
114: w.ws_col = col;
115: w.ws_xpixel = xpxl;
116: w.ws_ypixel = ypxl;
117:
118: if (ioctl(ptyfd, TIOCSWINSZ, &w) == -1) {
119: LOGERR;
120: return -1;
121: }
122:
123: return 0;
124: }
125:
126: /*
1.1.2.3 misho 127: * ioSetOwnerTTY() Set owner to TTY
1.1.2.2 misho 128: * @ttyname = tty filename
129: * @UID = uid
130: * @GID = gid
131: * return: -1 error or 0 ok
132: */
133: int
1.1.2.3 misho 134: ioSetOwnerTTY(const char *ttyname, uid_t UID, gid_t GID)
1.1.2.2 misho 135: {
136: struct group *grp;
137: gid_t gid;
138: mode_t mode;
139: struct stat st;
140:
141: assert(ttyname);
142: if (!ttyname) {
143: io_SetErr(EINVAL, "Error:: invalid arguments ...");
144: return -1;
145: }
146:
147: grp = getgrnam("tty");
148: if (!grp) {
149: gid = GID;
150: mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
151: } else {
152: gid = grp->gr_gid;
153: mode = S_IRUSR | S_IWUSR | S_IWGRP;
154: }
155:
156: if (stat(ttyname, &st) == -1) {
157: LOGERR;
158: return -1;
159: }
160:
161: if (st.st_uid != UID || st.st_gid != gid)
162: if (chown(ttyname, UID, gid) == -1) {
163: LOGERR;
164: return -1;
165: }
166: if ((st.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO)) != mode)
167: if (chmod(ttyname, mode) == -1) {
168: LOGERR;
169: return -1;
170: }
171:
172: return 0;
173: }
1.1.2.3 misho 174:
175: /*
176: * ioSetSidTTY() Makes the process's controlling TTY and sets it to sane modes.
177: * @ttyfd = slave fd, tty
178: * @ttyname = tty filename
179: * return: -1 error or 0 ok
180: */
181: int
182: ioSetSidTTY(int *ttyfd, const char *ttyname)
183: {
184: int fd;
185:
186: /* First disconnect from the old controlling tty. */
187: #ifdef TIOCNOTTY
188: fd = open(_PATH_TTY, O_RDWR | O_NOCTTY);
189: if (fd >= 0) {
190: ioctl(fd, TIOCNOTTY, NULL);
191: close(fd);
192: }
193: #endif
194: setsid();
195:
196: /* Verify that we are successfully disconnected from the controlling tty. */
197: fd = open(_PATH_TTY, O_RDWR | O_NOCTTY);
198: if (fd >= 0) {
199: io_SetErr(ENXIO, "Error:: Failed to disconnect from controlling tty.");
200: close(fd);
201: return -1;
202: }
203: /* Make it our controlling tty. */
204: #ifdef TIOCSCTTY
205: if (ioctl(*ttyfd, TIOCSCTTY, NULL) == -1) {
206: LOGERR;
207: return -1;
208: }
209: #endif
210: fd = open(ttyname, O_RDWR);
211: if (fd == -1) {
212: LOGERR;
213: return -1;
214: } else
215: close(fd);
216:
217: /* Verify that we now have a controlling tty. */
218: fd = open(_PATH_TTY, O_WRONLY);
219: if (fd == -1) {
220: LOGERR;
221: return -1;
222: } else
223: close(fd);
224:
1.1.2.5 misho 225: /* redirect standart handles to tty */
226: dup2(*ttyfd, STDIN_FILENO);
227: dup2(*ttyfd, STDOUT_FILENO);
228: dup2(*ttyfd, STDERR_FILENO);
229: if (*ttyfd > 2)
230: close(*ttyfd);
231:
232: /* NOW TTY IS READY! */
1.1.2.3 misho 233: return 0;
234: }
1.1.2.4 misho 235:
236: /*
237: * ioSetRAWMode() Enter into RAW mode
238: * @fd = tty fd
239: * @otio = saved old termios for later restore if !=NULL
240: * return: -1 error or 0 ok
241: */
242: inline int
243: ioSetRAWMode(int fd, struct termios *otio)
244: {
245: struct termios tio;
246:
247: if (tcgetattr(fd, &tio) == -1) {
248: LOGERR;
249: return -1;
250: }
251: if (otio)
252: *otio = tio;
253:
254: tio.c_iflag |= IGNPAR;
255: tio.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
256: #ifdef IUCLC
257: tio.c_iflag &= ~IUCLC;
258: #endif
259: tio.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
260: #ifdef IEXTEN
261: tio.c_lflag &= ~IEXTEN;
262: #endif
263: tio.c_oflag &= ~OPOST;
264: tio.c_cc[VMIN] = 1;
265: tio.c_cc[VTIME] = 0;
266:
267: if (tcsetattr(fd, TCSADRAIN, &tio) == -1) {
268: LOGERR;
269: return -1;
270: }
271:
272: return 0;
273: }
274:
275: /*
276: * ioRestoreMode() Restore termios to tty fd
277: * @fd = tty fd
278: * @tio = termios structure for restore
279: * return: -1 error or 0 ok
280: */
281: inline int
282: ioRestoreMode(int fd, struct termios tio)
283: {
284: if (tcsetattr(fd, TCSADRAIN, &tio) == -1) {
285: LOGERR;
286: return -1;
287: }
288:
289: return 0;
290: }
1.1.2.6 misho 291:
292: /*
293: * ioForkPTY() Fork new process with session leader and new TTY
294: * @ptyfd = master fd, pty
295: * @name = tty device name if not null
296: * @namesiz = name length, must be above 63 bytes.
297: * @term = termios for terminal
298: * @winz = winsize for terminal
299: * @otio = old termios structure for restore
300: * return: -1 error, 0 child process or >0 parent: pid of child
301: */
302: pid_t
303: ioForkPTY(int *ptyfd, char * __restrict name, int namesiz, struct termios * __restrict term,
304: struct winsize * __restrict winz, struct termios * __restrict otio)
305: {
306: int ttyfd;
307: pid_t pid;
308:
309: if (ioAllocPTY(ptyfd, &ttyfd, name, namesiz, term, winz))
310: return -1;
311:
312: switch ((pid = fork())) {
313: case -1:
314: LOGERR;
315: return -1;
316: case 0:
317: if (ioSetOwnerTTY(name, getuid(), getgid()) == -1) {
1.1.2.8 misho 318: ioFreePTY(*ptyfd, name);
1.1.2.6 misho 319: return -1;
320: }
321: if (ioSetSidTTY(&ttyfd, name) == -1) {
1.1.2.8 misho 322: ioFreePTY(*ptyfd, name);
1.1.2.6 misho 323: return -1;
324: }
1.1.2.7 misho 325: close(*ptyfd);
1.1.2.6 misho 326:
327: /* CHILD */
328: break;
329: default:
330: close(ttyfd);
331:
332: /* PARENT */
333: break;
334: }
335:
336: return pid;
337: }
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