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9a75fbc3 RG |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
26b5a830 KB |
3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
b8c620d6 KB |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
9a75fbc3 RG |
16 | */ |
17 | ||
18 | #ifndef lint | |
19 | char copyright[] = | |
20 | "@(#) Copyright (c) 1983 Regents of the University of California.\n\ | |
21 | All rights reserved.\n"; | |
26b5a830 | 22 | #endif /* not lint */ |
9a75fbc3 RG |
23 | |
24 | #ifndef lint | |
a0014217 | 25 | static char sccsid[] = "@(#)timedc.c 2.7 (Berkeley) %G%"; |
26b5a830 | 26 | #endif /* not lint */ |
9a75fbc3 RG |
27 | |
28 | #include "timedc.h" | |
29 | #include <signal.h> | |
30 | #include <ctype.h> | |
31 | #include <setjmp.h> | |
0bbdca37 | 32 | #include <syslog.h> |
9a75fbc3 RG |
33 | |
34 | int top; | |
35 | int margc; | |
36 | int fromatty; | |
37 | char *margv[20]; | |
38 | char cmdline[200]; | |
39 | jmp_buf toplevel; | |
40 | int intr(); | |
41 | int priv_resources(); | |
42 | struct cmd *getcmd(); | |
43 | ||
44 | ||
45 | main(argc, argv) | |
46 | char *argv[]; | |
47 | { | |
48 | register struct cmd *c; | |
49 | ||
bad1eddf EA |
50 | openlog("timedc", LOG_ODELAY, LOG_AUTH); |
51 | ||
9a75fbc3 RG |
52 | /* |
53 | * security dictates! | |
54 | */ | |
55 | if (priv_resources() < 0) { | |
56 | fprintf(stderr, "Could not get priviledged resources\n"); | |
57 | exit(1); | |
58 | } | |
59 | (void) setuid(getuid()); | |
60 | ||
61 | if (--argc > 0) { | |
62 | c = getcmd(*++argv); | |
63 | if (c == (struct cmd *)-1) { | |
64 | printf("?Ambiguous command\n"); | |
65 | exit(1); | |
66 | } | |
67 | if (c == 0) { | |
68 | printf("?Invalid command\n"); | |
69 | exit(1); | |
70 | } | |
99ab2e2c JB |
71 | if (c->c_priv && getuid()) { |
72 | printf("?Privileged command\n"); | |
73 | exit(1); | |
74 | } | |
9a75fbc3 RG |
75 | (*c->c_handler)(argc, argv); |
76 | exit(0); | |
77 | } | |
78 | fromatty = isatty(fileno(stdin)); | |
79 | top = setjmp(toplevel) == 0; | |
80 | if (top) | |
81 | (void) signal(SIGINT, intr); | |
82 | for (;;) { | |
83 | cmdscanner(top); | |
84 | top = 1; | |
85 | } | |
86 | } | |
87 | ||
88 | intr() | |
89 | { | |
90 | if (!fromatty) | |
91 | exit(0); | |
92 | longjmp(toplevel, 1); | |
93 | } | |
94 | ||
95 | /* | |
96 | * Command parser. | |
97 | */ | |
98 | cmdscanner(top) | |
99 | int top; | |
100 | { | |
101 | register struct cmd *c; | |
9a75fbc3 RG |
102 | extern int help(); |
103 | ||
104 | if (!top) | |
105 | putchar('\n'); | |
106 | for (;;) { | |
107 | if (fromatty) { | |
108 | printf("timedc> "); | |
109 | (void) fflush(stdout); | |
110 | } | |
a0014217 | 111 | if (fgets(cmdline, sizeof(cmdline), stdin) == 0) |
9a75fbc3 RG |
112 | quit(); |
113 | if (cmdline[0] == 0) | |
114 | break; | |
115 | makeargv(); | |
116 | c = getcmd(margv[0]); | |
117 | if (c == (struct cmd *)-1) { | |
118 | printf("?Ambiguous command\n"); | |
119 | continue; | |
120 | } | |
121 | if (c == 0) { | |
122 | printf("?Invalid command\n"); | |
123 | continue; | |
124 | } | |
125 | if (c->c_priv && getuid()) { | |
126 | printf("?Privileged command\n"); | |
127 | continue; | |
128 | } | |
129 | (*c->c_handler)(margc, margv); | |
130 | } | |
131 | longjmp(toplevel, 0); | |
132 | } | |
133 | ||
134 | struct cmd * | |
135 | getcmd(name) | |
136 | register char *name; | |
137 | { | |
138 | register char *p, *q; | |
139 | register struct cmd *c, *found; | |
140 | register int nmatches, longest; | |
20282126 | 141 | extern struct cmd cmdtab[]; |
85a4432a | 142 | extern int NCMDS; |
9a75fbc3 RG |
143 | |
144 | longest = 0; | |
145 | nmatches = 0; | |
146 | found = 0; | |
85a4432a JB |
147 | for (c = cmdtab; c < &cmdtab[NCMDS]; c++) { |
148 | p = c->c_name; | |
9a75fbc3 RG |
149 | for (q = name; *q == *p++; q++) |
150 | if (*q == 0) /* exact match? */ | |
151 | return(c); | |
152 | if (!*q) { /* the name was a prefix */ | |
153 | if (q - name > longest) { | |
154 | longest = q - name; | |
155 | nmatches = 1; | |
156 | found = c; | |
157 | } else if (q - name == longest) | |
158 | nmatches++; | |
159 | } | |
160 | } | |
161 | if (nmatches > 1) | |
162 | return((struct cmd *)-1); | |
163 | return(found); | |
164 | } | |
165 | ||
166 | /* | |
167 | * Slice a string up into argc/argv. | |
168 | */ | |
169 | makeargv() | |
170 | { | |
171 | register char *cp; | |
172 | register char **argp = margv; | |
173 | ||
174 | margc = 0; | |
175 | for (cp = cmdline; *cp;) { | |
176 | while (isspace(*cp)) | |
177 | cp++; | |
178 | if (*cp == '\0') | |
179 | break; | |
180 | *argp++ = cp; | |
181 | margc += 1; | |
182 | while (*cp != '\0' && !isspace(*cp)) | |
183 | cp++; | |
184 | if (*cp == '\0') | |
185 | break; | |
186 | *cp++ = '\0'; | |
187 | } | |
188 | *argp++ = 0; | |
189 | } | |
190 | ||
191 | #define HELPINDENT (sizeof ("directory")) | |
192 | ||
193 | /* | |
194 | * Help command. | |
195 | */ | |
196 | help(argc, argv) | |
197 | int argc; | |
198 | char *argv[]; | |
199 | { | |
200 | register struct cmd *c; | |
20282126 | 201 | extern struct cmd cmdtab[]; |
9a75fbc3 RG |
202 | |
203 | if (argc == 1) { | |
204 | register int i, j, w; | |
205 | int columns, width = 0, lines; | |
206 | extern int NCMDS; | |
207 | ||
208 | printf("Commands may be abbreviated. Commands are:\n\n"); | |
209 | for (c = cmdtab; c < &cmdtab[NCMDS]; c++) { | |
210 | int len = strlen(c->c_name); | |
211 | ||
212 | if (len > width) | |
213 | width = len; | |
214 | } | |
215 | width = (width + 8) &~ 7; | |
216 | columns = 80 / width; | |
217 | if (columns == 0) | |
218 | columns = 1; | |
219 | lines = (NCMDS + columns - 1) / columns; | |
220 | for (i = 0; i < lines; i++) { | |
221 | for (j = 0; j < columns; j++) { | |
222 | c = cmdtab + j * lines + i; | |
223 | printf("%s", c->c_name); | |
224 | if (c + lines >= &cmdtab[NCMDS]) { | |
225 | printf("\n"); | |
226 | break; | |
227 | } | |
228 | w = strlen(c->c_name); | |
229 | while (w < width) { | |
230 | w = (w + 8) &~ 7; | |
231 | putchar('\t'); | |
232 | } | |
233 | } | |
234 | } | |
235 | return; | |
236 | } | |
237 | while (--argc > 0) { | |
238 | register char *arg; | |
239 | arg = *++argv; | |
240 | c = getcmd(arg); | |
241 | if (c == (struct cmd *)-1) | |
242 | printf("?Ambiguous help command %s\n", arg); | |
243 | else if (c == (struct cmd *)0) | |
244 | printf("?Invalid help command %s\n", arg); | |
245 | else | |
246 | printf("%-*s\t%s\n", HELPINDENT, | |
247 | c->c_name, c->c_help); | |
248 | } | |
249 | } |