timedc.c revision 30642
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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1985, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)timedc.c 8.1 (Berkeley) 6/6/93"; 43#endif 44static const char rcsid[] = 45 "$Id$"; 46#endif /* not lint */ 47 48#include "timedc.h" 49#include <ctype.h> 50#include <err.h> 51#include <setjmp.h> 52#include <signal.h> 53#include <stdlib.h> 54#include <strings.h> 55#include <syslog.h> 56#include <unistd.h> 57 58int trace = 0; 59FILE *fd = 0; 60int margc; 61int fromatty; 62char *margv[20]; 63char cmdline[200]; 64jmp_buf toplevel; 65static struct cmd *getcmd __P((char *)); 66 67int 68main(argc, argv) 69 int argc; 70 char *argv[]; 71{ 72 register struct cmd *c; 73 74 openlog("timedc", LOG_ODELAY, LOG_AUTH); 75 76 /* 77 * security dictates! 78 */ 79 if (priv_resources() < 0) 80 errx(1, "could not get privileged resources"); 81 (void) setuid(getuid()); 82 83 if (--argc > 0) { 84 c = getcmd(*++argv); 85 if (c == (struct cmd *)-1) { 86 printf("?Ambiguous command\n"); 87 exit(1); 88 } 89 if (c == 0) { 90 printf("?Invalid command\n"); 91 exit(1); 92 } 93 if (c->c_priv && getuid()) { 94 printf("?Privileged command\n"); 95 exit(1); 96 } 97 (*c->c_handler)(argc, argv); 98 exit(0); 99 } 100 101 fromatty = isatty(fileno(stdin)); 102 if (setjmp(toplevel)) 103 putchar('\n'); 104 (void) signal(SIGINT, intr); 105 for (;;) { 106 if (fromatty) { 107 printf("timedc> "); 108 (void) fflush(stdout); 109 } 110 if (fgets(cmdline, sizeof(cmdline), stdin) == 0) 111 quit(); 112 if (cmdline[0] == 0) 113 break; 114 makeargv(); 115 if (margv[0] == 0) 116 continue; 117 c = getcmd(margv[0]); 118 if (c == (struct cmd *)-1) { 119 printf("?Ambiguous command\n"); 120 continue; 121 } 122 if (c == 0) { 123 printf("?Invalid command\n"); 124 continue; 125 } 126 if (c->c_priv && getuid()) { 127 printf("?Privileged command\n"); 128 continue; 129 } 130 (*c->c_handler)(margc, margv); 131 } 132 return 0; 133} 134 135void 136intr(signo) 137 int signo; 138{ 139 if (!fromatty) 140 exit(0); 141 longjmp(toplevel, 1); 142} 143 144 145static struct cmd * 146getcmd(name) 147 char *name; 148{ 149 register char *p, *q; 150 register struct cmd *c, *found; 151 register int nmatches, longest; 152 extern int NCMDS; 153 154 longest = 0; 155 nmatches = 0; 156 found = 0; 157 for (c = cmdtab; c < &cmdtab[NCMDS]; c++) { 158 p = c->c_name; 159 for (q = name; *q == *p++; q++) 160 if (*q == 0) /* exact match? */ 161 return(c); 162 if (!*q) { /* the name was a prefix */ 163 if (q - name > longest) { 164 longest = q - name; 165 nmatches = 1; 166 found = c; 167 } else if (q - name == longest) 168 nmatches++; 169 } 170 } 171 if (nmatches > 1) 172 return((struct cmd *)-1); 173 return(found); 174} 175 176/* 177 * Slice a string up into argc/argv. 178 */ 179void 180makeargv() 181{ 182 register char *cp; 183 register char **argp = margv; 184 185 margc = 0; 186 for (cp = cmdline; *cp;) { 187 while (isspace(*cp)) 188 cp++; 189 if (*cp == '\0') 190 break; 191 *argp++ = cp; 192 margc += 1; 193 while (*cp != '\0' && !isspace(*cp)) 194 cp++; 195 if (*cp == '\0') 196 break; 197 *cp++ = '\0'; 198 } 199 *argp++ = 0; 200} 201 202#define HELPINDENT (sizeof ("directory")) 203 204/* 205 * Help command. 206 */ 207void 208help(argc, argv) 209 int argc; 210 char *argv[]; 211{ 212 register struct cmd *c; 213 214 if (argc == 1) { 215 register int i, j, w; 216 int columns, width = 0, lines; 217 extern int NCMDS; 218 219 printf("Commands may be abbreviated. Commands are:\n\n"); 220 for (c = cmdtab; c < &cmdtab[NCMDS]; c++) { 221 int len = strlen(c->c_name); 222 223 if (len > width) 224 width = len; 225 } 226 width = (width + 8) &~ 7; 227 columns = 80 / width; 228 if (columns == 0) 229 columns = 1; 230 lines = (NCMDS + columns - 1) / columns; 231 for (i = 0; i < lines; i++) { 232 for (j = 0; j < columns; j++) { 233 c = cmdtab + j * lines + i; 234 printf("%s", c->c_name); 235 if (c + lines >= &cmdtab[NCMDS]) { 236 printf("\n"); 237 break; 238 } 239 w = strlen(c->c_name); 240 while (w < width) { 241 w = (w + 8) &~ 7; 242 putchar('\t'); 243 } 244 } 245 } 246 return; 247 } 248 while (--argc > 0) { 249 register char *arg; 250 arg = *++argv; 251 c = getcmd(arg); 252 if (c == (struct cmd *)-1) 253 printf("?Ambiguous help command %s\n", arg); 254 else if (c == (struct cmd *)0) 255 printf("?Invalid help command %s\n", arg); 256 else 257 printf("%-*s\t%s\n", (int)HELPINDENT, 258 c->c_name, c->c_help); 259 } 260} 261