1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef lint
34static char const copyright[] =
35"@(#) Copyright (c) 1991, 1993\n\
36	The Regents of the University of California.  All rights reserved.\n";
37#endif /* not lint */
38
39#ifndef lint
40#if 0
41static char sccsid[] = "@(#)main.c	8.6 (Berkeley) 5/28/95";
42#endif
43#endif /* not lint */
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD$");
46
47#include <stdio.h>
48#include <signal.h>
49#include <sys/stat.h>
50#include <unistd.h>
51#include <fcntl.h>
52#include <locale.h>
53#include <errno.h>
54
55#include "shell.h"
56#include "main.h"
57#include "mail.h"
58#include "options.h"
59#include "output.h"
60#include "parser.h"
61#include "nodes.h"
62#include "expand.h"
63#include "eval.h"
64#include "jobs.h"
65#include "input.h"
66#include "trap.h"
67#include "var.h"
68#include "show.h"
69#include "memalloc.h"
70#include "error.h"
71#include "init.h"
72#include "mystring.h"
73#include "exec.h"
74#include "cd.h"
75#include "builtins.h"
76
77int rootpid;
78int rootshell;
79struct jmploc main_handler;
80int localeisutf8, initial_localeisutf8;
81
82static void cmdloop(int);
83static void read_profile(char *);
84static char *find_dot_file(char *);
85
86/*
87 * Main routine.  We initialize things, parse the arguments, execute
88 * profiles if we're a login shell, and then call cmdloop to execute
89 * commands.  The setjmp call sets up the location to jump to when an
90 * exception occurs.  When an exception occurs the variable "state"
91 * is used to figure out how far we had gotten.
92 */
93
94int
95main(int argc, char *argv[])
96{
97	struct stackmark smark, smark2;
98	volatile int state;
99	char *shinit;
100
101	(void) setlocale(LC_ALL, "");
102	initcharset();
103	state = 0;
104	if (setjmp(main_handler.loc)) {
105		switch (exception) {
106		case EXEXEC:
107			exitstatus = exerrno;
108			break;
109
110		case EXERROR:
111			exitstatus = 2;
112			break;
113
114		default:
115			break;
116		}
117
118		if (state == 0 || iflag == 0 || ! rootshell ||
119		    exception == EXEXIT)
120			exitshell(exitstatus);
121		reset();
122		if (exception == EXINT)
123			out2fmt_flush("\n");
124		popstackmark(&smark);
125		FORCEINTON;				/* enable interrupts */
126		if (state == 1)
127			goto state1;
128		else if (state == 2)
129			goto state2;
130		else if (state == 3)
131			goto state3;
132		else
133			goto state4;
134	}
135	handler = &main_handler;
136#ifdef DEBUG
137	opentrace();
138	trputs("Shell args:  ");  trargs(argv);
139#endif
140	rootpid = getpid();
141	rootshell = 1;
142	init();
143	setstackmark(&smark);
144	setstackmark(&smark2);
145	procargs(argc, argv);
146	pwd_init(iflag);
147	if (iflag)
148		chkmail(1);
149	if (argv[0] && argv[0][0] == '-') {
150		state = 1;
151		read_profile("/etc/profile");
152state1:
153		state = 2;
154		if (privileged == 0)
155			read_profile("${HOME-}/.profile");
156		else
157			read_profile("/etc/suid_profile");
158	}
159state2:
160	state = 3;
161	if (!privileged && iflag) {
162		if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
163			state = 3;
164			read_profile(shinit);
165		}
166	}
167state3:
168	state = 4;
169	popstackmark(&smark2);
170	if (minusc) {
171		evalstring(minusc, sflag ? 0 : EV_EXIT);
172	}
173	if (sflag || minusc == NULL) {
174state4:	/* XXX ??? - why isn't this before the "if" statement */
175		cmdloop(1);
176	}
177	exitshell(exitstatus);
178	/*NOTREACHED*/
179	return 0;
180}
181
182
183/*
184 * Read and execute commands.  "Top" is nonzero for the top level command
185 * loop; it turns on prompting if the shell is interactive.
186 */
187
188static void
189cmdloop(int top)
190{
191	union node *n;
192	struct stackmark smark;
193	int inter;
194	int numeof = 0;
195
196	TRACE(("cmdloop(%d) called\n", top));
197	setstackmark(&smark);
198	for (;;) {
199		if (pendingsigs)
200			dotrap();
201		inter = 0;
202		if (iflag && top) {
203			inter++;
204			showjobs(1, SHOWJOBS_DEFAULT);
205			chkmail(0);
206			flushout(&output);
207		}
208		n = parsecmd(inter);
209		/* showtree(n); DEBUG */
210		if (n == NEOF) {
211			if (!top || numeof >= 50)
212				break;
213			if (!stoppedjobs()) {
214				if (!Iflag)
215					break;
216				out2fmt_flush("\nUse \"exit\" to leave shell.\n");
217			}
218			numeof++;
219		} else if (n != NULL && nflag == 0) {
220			job_warning = (job_warning == 2) ? 1 : 0;
221			numeof = 0;
222			evaltree(n, 0);
223		}
224		popstackmark(&smark);
225		setstackmark(&smark);
226		if (evalskip != 0) {
227			if (evalskip == SKIPFILE)
228				evalskip = 0;
229			break;
230		}
231	}
232	popstackmark(&smark);
233}
234
235
236
237/*
238 * Read /etc/profile or .profile.  Return on error.
239 */
240
241static void
242read_profile(char *name)
243{
244	int fd;
245	const char *expandedname;
246
247	expandedname = expandstr(name);
248	if (expandedname == NULL)
249		return;
250	INTOFF;
251	if ((fd = open(expandedname, O_RDONLY)) >= 0)
252		setinputfd(fd, 1);
253	INTON;
254	if (fd < 0)
255		return;
256	cmdloop(0);
257	popfile();
258}
259
260
261
262/*
263 * Read a file containing shell functions.
264 */
265
266void
267readcmdfile(const char *name)
268{
269	setinputfile(name, 1);
270	cmdloop(0);
271	popfile();
272}
273
274
275
276/*
277 * Take commands from a file.  To be compatible we should do a path
278 * search for the file, which is necessary to find sub-commands.
279 */
280
281
282static char *
283find_dot_file(char *basename)
284{
285	char *fullname;
286	const char *path = pathval();
287	struct stat statb;
288
289	/* don't try this for absolute or relative paths */
290	if( strchr(basename, '/'))
291		return basename;
292
293	while ((fullname = padvance(&path, basename)) != NULL) {
294		if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
295			/*
296			 * Don't bother freeing here, since it will
297			 * be freed by the caller.
298			 */
299			return fullname;
300		}
301		stunalloc(fullname);
302	}
303	return basename;
304}
305
306int
307dotcmd(int argc, char **argv)
308{
309	char *filename, *fullname;
310
311	if (argc < 2)
312		error("missing filename");
313
314	exitstatus = 0;
315
316	/*
317	 * Because we have historically not supported any options,
318	 * only treat "--" specially.
319	 */
320	filename = argc > 2 && strcmp(argv[1], "--") == 0 ? argv[2] : argv[1];
321
322	fullname = find_dot_file(filename);
323	setinputfile(fullname, 1);
324	commandname = fullname;
325	cmdloop(0);
326	popfile();
327	return exitstatus;
328}
329
330
331int
332exitcmd(int argc, char **argv)
333{
334	if (stoppedjobs())
335		return 0;
336	if (argc > 1)
337		exitshell(number(argv[1]));
338	else
339		exitshell_savedstatus();
340}
341