4.3BSD - /usr/src/etc/timed/timedc.c

   1: /*
   2:  * Copyright (c) 1983 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifndef lint
   8: char copyright[] =
   9: "@(#) Copyright (c) 1983 Regents of the University of California.\n\
  10:  All rights reserved.\n";
  11: #endif not lint
  12: 
  13: #ifndef lint
  14: static char sccsid[] = "@(#)timedc.c	2.3 (Berkeley) 6/5/86";
  15: #endif not lint
  16: 
  17: #include "timedc.h"
  18: #include <signal.h>
  19: #include <ctype.h>
  20: #include <setjmp.h>
  21: #include <syslog.h>
  22: 
  23: int top;
  24: int margc;
  25: int fromatty;
  26: char    *margv[20];
  27: char    cmdline[200];
  28: jmp_buf toplevel;
  29: int intr();
  30: int priv_resources();
  31: struct  cmd *getcmd();
  32: 
  33: 
  34: main(argc, argv)
  35:     char *argv[];
  36: {
  37:     register struct cmd *c;
  38: 
  39:     openlog("timedc", LOG_ODELAY, LOG_AUTH);
  40: 
  41:     /*
  42: 	 * security dictates!
  43: 	 */
  44:     if (priv_resources() < 0) {
  45:         fprintf(stderr, "Could not get priviledged resources\n");
  46:         exit(1);
  47:     }
  48:     (void) setuid(getuid());
  49: 
  50:     if (--argc > 0) {
  51:         c = getcmd(*++argv);
  52:         if (c == (struct cmd *)-1) {
  53:             printf("?Ambiguous command\n");
  54:             exit(1);
  55:         }
  56:         if (c == 0) {
  57:             printf("?Invalid command\n");
  58:             exit(1);
  59:         }
  60:         if (c->c_priv && getuid()) {
  61:             printf("?Privileged command\n");
  62:             exit(1);
  63:         }
  64:         (*c->c_handler)(argc, argv);
  65:         exit(0);
  66:     }
  67:     fromatty = isatty(fileno(stdin));
  68:     top = setjmp(toplevel) == 0;
  69:     if (top)
  70:         (void) signal(SIGINT, intr);
  71:     for (;;) {
  72:         cmdscanner(top);
  73:         top = 1;
  74:     }
  75: }
  76: 
  77: intr()
  78: {
  79:     if (!fromatty)
  80:         exit(0);
  81:     longjmp(toplevel, 1);
  82: }
  83: 
  84: /*
  85:  * Command parser.
  86:  */
  87: cmdscanner(top)
  88:     int top;
  89: {
  90:     register struct cmd *c;
  91:     extern struct cmd cmdtab[];
  92:     extern int help();
  93: 
  94:     if (!top)
  95:         putchar('\n');
  96:     for (;;) {
  97:         if (fromatty) {
  98:             printf("timedc> ");
  99:             (void) fflush(stdout);
 100:         }
 101:         if (gets(cmdline) == 0)
 102:             quit();
 103:         if (cmdline[0] == 0)
 104:             break;
 105:         makeargv();
 106:         c = getcmd(margv[0]);
 107:         if (c == (struct cmd *)-1) {
 108:             printf("?Ambiguous command\n");
 109:             continue;
 110:         }
 111:         if (c == 0) {
 112:             printf("?Invalid command\n");
 113:             continue;
 114:         }
 115:         if (c->c_priv && getuid()) {
 116:             printf("?Privileged command\n");
 117:             continue;
 118:         }
 119:         (*c->c_handler)(margc, margv);
 120:     }
 121:     longjmp(toplevel, 0);
 122: }
 123: 
 124: struct cmd *
 125: getcmd(name)
 126:     register char *name;
 127: {
 128:     register char *p, *q;
 129:     register struct cmd *c, *found;
 130:     register int nmatches, longest;
 131:     extern int NCMDS;
 132: 
 133:     longest = 0;
 134:     nmatches = 0;
 135:     found = 0;
 136:     for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
 137:         p = c->c_name;
 138:         for (q = name; *q == *p++; q++)
 139:             if (*q == 0)        /* exact match? */
 140:                 return(c);
 141:         if (!*q) {          /* the name was a prefix */
 142:             if (q - name > longest) {
 143:                 longest = q - name;
 144:                 nmatches = 1;
 145:                 found = c;
 146:             } else if (q - name == longest)
 147:                 nmatches++;
 148:         }
 149:     }
 150:     if (nmatches > 1)
 151:         return((struct cmd *)-1);
 152:     return(found);
 153: }
 154: 
 155: /*
 156:  * Slice a string up into argc/argv.
 157:  */
 158: makeargv()
 159: {
 160:     register char *cp;
 161:     register char **argp = margv;
 162: 
 163:     margc = 0;
 164:     for (cp = cmdline; *cp;) {
 165:         while (isspace(*cp))
 166:             cp++;
 167:         if (*cp == '\0')
 168:             break;
 169:         *argp++ = cp;
 170:         margc += 1;
 171:         while (*cp != '\0' && !isspace(*cp))
 172:             cp++;
 173:         if (*cp == '\0')
 174:             break;
 175:         *cp++ = '\0';
 176:     }
 177:     *argp++ = 0;
 178: }
 179: 
 180: #define HELPINDENT (sizeof ("directory"))
 181: 
 182: /*
 183:  * Help command.
 184:  */
 185: help(argc, argv)
 186:     int argc;
 187:     char *argv[];
 188: {
 189:     register struct cmd *c;
 190: 
 191:     if (argc == 1) {
 192:         register int i, j, w;
 193:         int columns, width = 0, lines;
 194:         extern int NCMDS;
 195: 
 196:         printf("Commands may be abbreviated.  Commands are:\n\n");
 197:         for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
 198:             int len = strlen(c->c_name);
 199: 
 200:             if (len > width)
 201:                 width = len;
 202:         }
 203:         width = (width + 8) &~ 7;
 204:         columns = 80 / width;
 205:         if (columns == 0)
 206:             columns = 1;
 207:         lines = (NCMDS + columns - 1) / columns;
 208:         for (i = 0; i < lines; i++) {
 209:             for (j = 0; j < columns; j++) {
 210:                 c = cmdtab + j * lines + i;
 211:                 printf("%s", c->c_name);
 212:                 if (c + lines >= &cmdtab[NCMDS]) {
 213:                     printf("\n");
 214:                     break;
 215:                 }
 216:                 w = strlen(c->c_name);
 217:                 while (w < width) {
 218:                     w = (w + 8) &~ 7;
 219:                     putchar('\t');
 220:                 }
 221:             }
 222:         }
 223:         return;
 224:     }
 225:     while (--argc > 0) {
 226:         register char *arg;
 227:         arg = *++argv;
 228:         c = getcmd(arg);
 229:         if (c == (struct cmd *)-1)
 230:             printf("?Ambiguous help command %s\n", arg);
 231:         else if (c == (struct cmd *)0)
 232:             printf("?Invalid help command %s\n", arg);
 233:         else
 234:             printf("%-*s\t%s\n", HELPINDENT,
 235:                 c->c_name, c->c_help);
 236:     }
 237: }

Defined functions

Defined variables

Defined macros