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[FreeBSD/releng/9.2.git] / usr.sbin / timed / timedc / timedc.c
1 /*-
2  * Copyright (c) 1985, 1993
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29
30 #ifndef lint
31 static const char copyright[] =
32 "@(#) Copyright (c) 1985, 1993\n\
33         The Regents of the University of California.  All rights reserved.\n";
34 #endif /* not lint */
35
36 #ifndef lint
37 #if 0
38 static char sccsid[] = "@(#)timedc.c    8.1 (Berkeley) 6/6/93";
39 #endif
40 static const char rcsid[] =
41   "$FreeBSD$";
42 #endif /* not lint */
43
44 #include "timedc.h"
45 #include <ctype.h>
46 #include <err.h>
47 #include <setjmp.h>
48 #include <signal.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <syslog.h>
52 #include <unistd.h>
53
54 int trace = 0;
55 FILE *fd = 0;
56 int     margc;
57 int     fromatty;
58 #define MAX_MARGV       20
59 char    *margv[MAX_MARGV];
60 char    cmdline[200];
61 jmp_buf toplevel;
62 static struct cmd *getcmd(char *);
63
64 int
65 main(argc, argv)
66         int argc;
67         char *argv[];
68 {
69         register struct cmd *c;
70
71         openlog("timedc", LOG_ODELAY, 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 == 0) {
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) == 0)
109                         quit();
110                 if (cmdline[0] == 0)
111                         break;
112                 makeargv();
113                 if (margv[0] == 0)
114                         continue;
115                 c = getcmd(margv[0]);
116                 if (c == (struct cmd *)-1) {
117                         printf("?Ambiguous command\n");
118                         continue;
119                 }
120                 if (c == 0) {
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(signo)
135         int signo;
136 {
137         if (!fromatty)
138                 exit(0);
139         longjmp(toplevel, 1);
140 }
141
142
143 static struct cmd *
144 getcmd(name)
145         char *name;
146 {
147         register char *p, *q;
148         register struct cmd *c, *found;
149         register int nmatches, longest;
150         extern int NCMDS;
151
152         longest = 0;
153         nmatches = 0;
154         found = 0;
155         for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
156                 p = c->c_name;
157                 for (q = name; *q == *p++; q++)
158                         if (*q == 0)            /* exact match? */
159                                 return(c);
160                 if (!*q) {                      /* the name was a prefix */
161                         if (q - name > longest) {
162                                 longest = q - name;
163                                 nmatches = 1;
164                                 found = c;
165                         } else if (q - name == longest)
166                                 nmatches++;
167                 }
168         }
169         if (nmatches > 1)
170                 return((struct cmd *)-1);
171         return(found);
172 }
173
174 /*
175  * Slice a string up into argc/argv.
176  */
177 void
178 makeargv()
179 {
180         register char *cp;
181         register char **argp = margv;
182
183         margc = 0;
184         for (cp = cmdline; margc < MAX_MARGV - 1 && *cp; ) {
185                 while (isspace(*cp))
186                         cp++;
187                 if (*cp == '\0')
188                         break;
189                 *argp++ = cp;
190                 margc += 1;
191                 while (*cp != '\0' && !isspace(*cp))
192                         cp++;
193                 if (*cp == '\0')
194                         break;
195                 *cp++ = '\0';
196         }
197         *argp++ = 0;
198 }
199
200 #define HELPINDENT (sizeof ("directory"))
201
202 /*
203  * Help command.
204  */
205 void
206 help(argc, argv)
207         int argc;
208         char *argv[];
209 {
210         register struct cmd *c;
211
212         if (argc == 1) {
213                 register int i, j, w;
214                 int columns, width = 0, lines;
215                 extern int NCMDS;
216
217                 printf("Commands may be abbreviated.  Commands are:\n\n");
218                 for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
219                         int len = strlen(c->c_name);
220
221                         if (len > width)
222                                 width = len;
223                 }
224                 width = (width + 8) &~ 7;
225                 columns = 80 / width;
226                 if (columns == 0)
227                         columns = 1;
228                 lines = (NCMDS + columns - 1) / columns;
229                 for (i = 0; i < lines; i++) {
230                         for (j = 0; j < columns; j++) {
231                                 c = cmdtab + j * lines + i;
232                                 printf("%s", c->c_name);
233                                 if (c + lines >= &cmdtab[NCMDS]) {
234                                         printf("\n");
235                                         break;
236                                 }
237                                 w = strlen(c->c_name);
238                                 while (w < width) {
239                                         w = (w + 8) &~ 7;
240                                         putchar('\t');
241                                 }
242                         }
243                 }
244                 return;
245         }
246         while (--argc > 0) {
247                 register char *arg;
248                 arg = *++argv;
249                 c = getcmd(arg);
250                 if (c == (struct cmd *)-1)
251                         printf("?Ambiguous help command %s\n", arg);
252                 else if (c == (struct cmd *)0)
253                         printf("?Invalid help command %s\n", arg);
254                 else
255                         printf("%-*s\t%s\n", (int)HELPINDENT,
256                                 c->c_name, c->c_help);
257         }
258 }