1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 char copyright[] = 10 "@(#) Copyright (c) 1983 Regents of the University of California.\n\ 11 All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)timedc.c 2.9 (Berkeley) 06/01/90"; 16 #endif /* not lint */ 17 18 #include "timedc.h" 19 #include <signal.h> 20 #include <ctype.h> 21 #include <setjmp.h> 22 #include <syslog.h> 23 24 int top; 25 int margc; 26 int fromatty; 27 char *margv[20]; 28 char cmdline[200]; 29 jmp_buf toplevel; 30 int intr(); 31 int priv_resources(); 32 struct cmd *getcmd(); 33 34 35 main(argc, argv) 36 char *argv[]; 37 { 38 register struct cmd *c; 39 40 openlog("timedc", LOG_ODELAY, LOG_AUTH); 41 42 /* 43 * security dictates! 44 */ 45 if (priv_resources() < 0) { 46 fprintf(stderr, "Could not get privileged resources\n"); 47 exit(1); 48 } 49 (void) setuid(getuid()); 50 51 if (--argc > 0) { 52 c = getcmd(*++argv); 53 if (c == (struct cmd *)-1) { 54 printf("?Ambiguous command\n"); 55 exit(1); 56 } 57 if (c == 0) { 58 printf("?Invalid command\n"); 59 exit(1); 60 } 61 if (c->c_priv && getuid()) { 62 printf("?Privileged command\n"); 63 exit(1); 64 } 65 (*c->c_handler)(argc, argv); 66 exit(0); 67 } 68 fromatty = isatty(fileno(stdin)); 69 top = setjmp(toplevel) == 0; 70 if (top) 71 (void) signal(SIGINT, intr); 72 for (;;) { 73 cmdscanner(top); 74 top = 1; 75 } 76 } 77 78 intr() 79 { 80 if (!fromatty) 81 exit(0); 82 longjmp(toplevel, 1); 83 } 84 85 /* 86 * Command parser. 87 */ 88 cmdscanner(top) 89 int top; 90 { 91 register struct cmd *c; 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 (fgets(cmdline, sizeof(cmdline), stdin) == 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 struct cmd cmdtab[]; 132 extern int NCMDS; 133 134 longest = 0; 135 nmatches = 0; 136 found = 0; 137 for (c = cmdtab; c < &cmdtab[NCMDS]; c++) { 138 p = c->c_name; 139 for (q = name; *q == *p++; q++) 140 if (*q == 0) /* exact match? */ 141 return(c); 142 if (!*q) { /* the name was a prefix */ 143 if (q - name > longest) { 144 longest = q - name; 145 nmatches = 1; 146 found = c; 147 } else if (q - name == longest) 148 nmatches++; 149 } 150 } 151 if (nmatches > 1) 152 return((struct cmd *)-1); 153 return(found); 154 } 155 156 /* 157 * Slice a string up into argc/argv. 158 */ 159 makeargv() 160 { 161 register char *cp; 162 register char **argp = margv; 163 164 margc = 0; 165 for (cp = cmdline; *cp;) { 166 while (isspace(*cp)) 167 cp++; 168 if (*cp == '\0') 169 break; 170 *argp++ = cp; 171 margc += 1; 172 while (*cp != '\0' && !isspace(*cp)) 173 cp++; 174 if (*cp == '\0') 175 break; 176 *cp++ = '\0'; 177 } 178 *argp++ = 0; 179 } 180 181 #define HELPINDENT (sizeof ("directory")) 182 183 /* 184 * Help command. 185 */ 186 help(argc, argv) 187 int argc; 188 char *argv[]; 189 { 190 register struct cmd *c; 191 extern struct cmd cmdtab[]; 192 193 if (argc == 1) { 194 register int i, j, w; 195 int columns, width = 0, lines; 196 extern int NCMDS; 197 198 printf("Commands may be abbreviated. Commands are:\n\n"); 199 for (c = cmdtab; c < &cmdtab[NCMDS]; c++) { 200 int len = strlen(c->c_name); 201 202 if (len > width) 203 width = len; 204 } 205 width = (width + 8) &~ 7; 206 columns = 80 / width; 207 if (columns == 0) 208 columns = 1; 209 lines = (NCMDS + columns - 1) / columns; 210 for (i = 0; i < lines; i++) { 211 for (j = 0; j < columns; j++) { 212 c = cmdtab + j * lines + i; 213 printf("%s", c->c_name); 214 if (c + lines >= &cmdtab[NCMDS]) { 215 printf("\n"); 216 break; 217 } 218 w = strlen(c->c_name); 219 while (w < width) { 220 w = (w + 8) &~ 7; 221 putchar('\t'); 222 } 223 } 224 } 225 return; 226 } 227 while (--argc > 0) { 228 register char *arg; 229 arg = *++argv; 230 c = getcmd(arg); 231 if (c == (struct cmd *)-1) 232 printf("?Ambiguous help command %s\n", arg); 233 else if (c == (struct cmd *)0) 234 printf("?Invalid help command %s\n", arg); 235 else 236 printf("%-*s\t%s\n", HELPINDENT, 237 c->c_name, c->c_help); 238 } 239 } 240