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1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1985, 1993
5  *      The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31
32 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1985, 1993\n\
35         The Regents of the University of California.  All rights reserved.\n";
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)timedc.c    8.1 (Berkeley) 6/6/93";
41 #endif
42 static const char rcsid[] =
43   "$FreeBSD$";
44 #endif /* not lint */
45
46 #include "timedc.h"
47 #include <ctype.h>
48 #include <err.h>
49 #include <setjmp.h>
50 #include <signal.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <syslog.h>
54 #include <unistd.h>
55
56 int trace = 0;
57 FILE *fd = NULL;
58 int     margc;
59 int     fromatty;
60 #define MAX_MARGV       20
61 char    *margv[MAX_MARGV];
62 char    cmdline[200];
63 jmp_buf toplevel;
64 static struct cmd *getcmd(char *);
65
66 int
67 main(int argc, char *argv[])
68 {
69         register struct cmd *c;
70
71         openlog("timedc", 0, LOG_AUTH);
72
73         /*
74          * security dictates!
75          */
76         if (priv_resources() < 0)
77                 errx(1, "could not get privileged resources");
78         if (setuid(getuid()) != 0)
79                 err(1, "setuid()");
80
81         if (--argc > 0) {
82                 c = getcmd(*++argv);
83                 if (c == (struct cmd *)-1) {
84                         printf("?Ambiguous command\n");
85                         exit(1);
86                 }
87                 if (c == NULL) {
88                         printf("?Invalid command\n");
89                         exit(1);
90                 }
91                 if (c->c_priv && getuid()) {
92                         printf("?Privileged command\n");
93                         exit(1);
94                 }
95                 (*c->c_handler)(argc, argv);
96                 exit(0);
97         }
98
99         fromatty = isatty(fileno(stdin));
100         if (setjmp(toplevel))
101                 putchar('\n');
102         (void) signal(SIGINT, intr);
103         for (;;) {
104                 if (fromatty) {
105                         printf("timedc> ");
106                         (void) fflush(stdout);
107                 }
108                 if (fgets(cmdline, sizeof(cmdline), stdin) == NULL)
109                         quit();
110                 if (cmdline[0] == 0)
111                         break;
112                 makeargv();
113                 if (margv[0] == NULL)
114                         continue;
115                 c = getcmd(margv[0]);
116                 if (c == (struct cmd *)-1) {
117                         printf("?Ambiguous command\n");
118                         continue;
119                 }
120                 if (c == NULL) {
121                         printf("?Invalid command\n");
122                         continue;
123                 }
124                 if (c->c_priv && getuid()) {
125                         printf("?Privileged command\n");
126                         continue;
127                 }
128                 (*c->c_handler)(margc, margv);
129         }
130         return 0;
131 }
132
133 void
134 intr(int signo __unused)
135 {
136         if (!fromatty)
137                 exit(0);
138         longjmp(toplevel, 1);
139 }
140
141
142 static struct cmd *
143 getcmd(char *name)
144 {
145         register char *p, *q;
146         register struct cmd *c, *found;
147         register int nmatches, longest;
148         extern int NCMDS;
149
150         longest = 0;
151         nmatches = 0;
152         found = NULL;
153         for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
154                 p = c->c_name;
155                 for (q = name; *q == *p++; q++)
156                         if (*q == 0)            /* exact match? */
157                                 return(c);
158                 if (!*q) {                      /* the name was a prefix */
159                         if (q - name > longest) {
160                                 longest = q - name;
161                                 nmatches = 1;
162                                 found = c;
163                         } else if (q - name == longest)
164                                 nmatches++;
165                 }
166         }
167         if (nmatches > 1)
168                 return((struct cmd *)-1);
169         return(found);
170 }
171
172 /*
173  * Slice a string up into argc/argv.
174  */
175 void
176 makeargv(void)
177 {
178         register char *cp;
179         register char **argp = margv;
180
181         margc = 0;
182         for (cp = cmdline; margc < MAX_MARGV - 1 && *cp; ) {
183                 while (isspace(*cp))
184                         cp++;
185                 if (*cp == '\0')
186                         break;
187                 *argp++ = cp;
188                 margc += 1;
189                 while (*cp != '\0' && !isspace(*cp))
190                         cp++;
191                 if (*cp == '\0')
192                         break;
193                 *cp++ = '\0';
194         }
195         *argp++ = NULL;
196 }
197
198 #define HELPINDENT (sizeof ("directory"))
199
200 /*
201  * Help command.
202  */
203 void
204 help(int argc, char *argv[])
205 {
206         register struct cmd *c;
207
208         if (argc == 1) {
209                 register int i, j, w;
210                 int columns, width = 0, lines;
211                 extern int NCMDS;
212
213                 printf("Commands may be abbreviated.  Commands are:\n\n");
214                 for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
215                         int len = strlen(c->c_name);
216
217                         if (len > width)
218                                 width = len;
219                 }
220                 width = (width + 8) &~ 7;
221                 columns = 80 / width;
222                 if (columns == 0)
223                         columns = 1;
224                 lines = (NCMDS + columns - 1) / columns;
225                 for (i = 0; i < lines; i++) {
226                         for (j = 0; j < columns; j++) {
227                                 c = cmdtab + j * lines + i;
228                                 printf("%s", c->c_name);
229                                 if (c + lines >= &cmdtab[NCMDS]) {
230                                         printf("\n");
231                                         break;
232                                 }
233                                 w = strlen(c->c_name);
234                                 while (w < width) {
235                                         w = (w + 8) &~ 7;
236                                         putchar('\t');
237                                 }
238                         }
239                 }
240                 return;
241         }
242         while (--argc > 0) {
243                 register char *arg;
244                 arg = *++argv;
245                 c = getcmd(arg);
246                 if (c == (struct cmd *)-1)
247                         printf("?Ambiguous help command %s\n", arg);
248                 else if (c == (struct cmd *)0)
249                         printf("?Invalid help command %s\n", arg);
250                 else
251                         printf("%-*s\t%s\n", (int)HELPINDENT,
252                                 c->c_name, c->c_help);
253         }
254 }