dm.c revision 1.13
1 /* $NetBSD: dm.c,v 1.13 1999/09/19 18:13:41 jsm Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1987, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)dm.c 8.1 (Berkeley) 5/31/93"; 45 #else 46 __RCSID("$NetBSD: dm.c,v 1.13 1999/09/19 18:13:41 jsm Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/file.h> 52 #include <sys/time.h> 53 #include <sys/resource.h> 54 55 #include <err.h> 56 #include <ctype.h> 57 #include <errno.h> 58 #include <nlist.h> 59 #include <pwd.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <time.h> 64 #include <unistd.h> 65 #include <utmp.h> 66 67 #include "pathnames.h" 68 69 static time_t now; /* current time value */ 70 static int priority = 0; /* priority game runs at */ 71 static char *game, /* requested game */ 72 *gametty; /* from tty? */ 73 74 void c_day __P((const char *, const char *, const char *)); 75 void c_game __P((const char *, const char *, const char *, const char *)); 76 void c_tty __P((const char *)); 77 const char *hour __P((int)); 78 double load __P((void)); 79 int main __P((int, char *[])); 80 void nogamefile __P((void)); 81 void play __P((char **)) __attribute__((__noreturn__)); 82 void read_config __P((void)); 83 int users __P((void)); 84 85 int 86 main(argc, argv) 87 int argc; 88 char *argv[]; 89 { 90 char *cp; 91 92 nogamefile(); 93 game = (cp = strrchr(*argv, '/')) ? ++cp : *argv; 94 95 if (!strcmp(game, "dm")) 96 exit(0); 97 98 gametty = ttyname(0); 99 unsetenv("TZ"); 100 (void)time(&now); 101 read_config(); 102 #ifdef LOG 103 logfile(); 104 #endif 105 play(argv); 106 /*NOTREACHED*/ 107 return (0); 108 } 109 110 /* 111 * play -- 112 * play the game 113 */ 114 void 115 play(args) 116 char **args; 117 { 118 char pbuf[MAXPATHLEN]; 119 120 (void)strncpy(pbuf, _PATH_HIDE, sizeof(pbuf) - 1); 121 (void)strncpy(pbuf + sizeof(_PATH_HIDE) - 1, game, 122 sizeof(pbuf) - sizeof(_PATH_HIDE) - 1); 123 pbuf[sizeof(pbuf) - 1] = '\0'; 124 if (priority > 0) /* < 0 requires root */ 125 (void)setpriority(PRIO_PROCESS, 0, priority); 126 execv(pbuf, args); 127 err(1, "%s", pbuf); 128 } 129 130 /* 131 * read_config -- 132 * read through config file, looking for key words. 133 */ 134 void 135 read_config() 136 { 137 FILE *cfp; 138 char lbuf[BUFSIZ], f1[40], f2[40], f3[40], f4[40], f5[40]; 139 140 if (!(cfp = fopen(_PATH_CONFIG, "r"))) 141 return; 142 while (fgets(lbuf, sizeof(lbuf), cfp)) 143 switch (*lbuf) { 144 case 'b': /* badtty */ 145 if (sscanf(lbuf, "%s%s", f1, f2) != 2 || 146 strcasecmp(f1, "badtty")) 147 break; 148 c_tty(f2); 149 break; 150 case 'g': /* game */ 151 if (sscanf(lbuf, "%s%s%s%s%s", 152 f1, f2, f3, f4, f5) != 5 || strcasecmp(f1, "game")) 153 break; 154 c_game(f2, f3, f4, f5); 155 break; 156 case 't': /* time */ 157 if (sscanf(lbuf, "%s%s%s%s", f1, f2, f3, f4) != 4 || 158 strcasecmp(f1, "time")) 159 break; 160 c_day(f2, f3, f4); 161 } 162 (void)fclose(cfp); 163 } 164 165 /* 166 * c_day -- 167 * if day is today, see if okay to play 168 */ 169 void 170 c_day(s_day, s_start, s_stop) 171 const char *s_day, *s_start, *s_stop; 172 { 173 static const char *const days[] = { 174 "sunday", "monday", "tuesday", "wednesday", 175 "thursday", "friday", "saturday", 176 }; 177 static struct tm *ct; 178 int start, stop; 179 180 if (!ct) 181 ct = localtime(&now); 182 if (strcasecmp(s_day, days[ct->tm_wday])) 183 return; 184 if (!isdigit(*s_start) || !isdigit(*s_stop)) 185 return; 186 start = atoi(s_start); 187 stop = atoi(s_stop); 188 if (ct->tm_hour >= start && ct->tm_hour < stop) { 189 if (start == 0 && stop == 24) 190 errx(0, "Sorry, games are not available today."); 191 else 192 errx(0, "Sorry, games are not available from %s to %s today.", 193 hour(start), hour(stop)); 194 } 195 } 196 197 /* 198 * c_tty -- 199 * decide if this tty can be used for games. 200 */ 201 void 202 c_tty(tty) 203 const char *tty; 204 { 205 static int first = 1; 206 static char *p_tty; 207 208 if (first) { 209 p_tty = strrchr(gametty, '/'); 210 first = 0; 211 } 212 213 if (!strcmp(gametty, tty) || (p_tty && !strcmp(p_tty, tty))) 214 errx(1, "Sorry, you may not play games on %s.", gametty); 215 } 216 217 /* 218 * c_game -- 219 * see if game can be played now. 220 */ 221 void 222 c_game(s_game, s_load, s_users, s_priority) 223 const char *s_game, *s_load, *s_users, *s_priority; 224 { 225 static int found; 226 227 if (found) 228 return; 229 if (strcmp(game, s_game) && strcasecmp("default", s_game)) 230 return; 231 ++found; 232 if (isdigit(*s_load) && atoi(s_load) < load()) 233 errx(0, "Sorry, the load average is too high right now."); 234 if (isdigit(*s_users) && atoi(s_users) <= users()) 235 errx(0, "Sorry, there are too many users logged on right now."); 236 if (isdigit(*s_priority)) 237 priority = atoi(s_priority); 238 } 239 240 /* 241 * load -- 242 * return 15 minute load average 243 */ 244 double 245 load() 246 { 247 double avenrun[3]; 248 249 if (getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])) < 0) 250 err(1, "getloadavg() failed."); 251 return (avenrun[2]); 252 } 253 254 /* 255 * users -- 256 * return current number of users 257 * todo: check idle time; if idle more than X minutes, don't 258 * count them. 259 */ 260 int 261 users() 262 { 263 264 int nusers, utmp; 265 struct utmp buf; 266 267 if ((utmp = open(_PATH_UTMP, O_RDONLY, 0)) < 0) 268 err(1, "%s", _PATH_UTMP); 269 for (nusers = 0; read(utmp, (char *)&buf, sizeof(struct utmp)) > 0;) 270 if (buf.ut_name[0] != '\0') 271 ++nusers; 272 return (nusers); 273 } 274 275 void 276 nogamefile() 277 { 278 int fd, n; 279 char buf[BUFSIZ]; 280 281 if ((fd = open(_PATH_NOGAMES, O_RDONLY, 0)) >= 0) { 282 #define MESG "Sorry, no games right now.\n\n" 283 (void)write(2, MESG, sizeof(MESG) - 1); 284 while ((n = read(fd, buf, sizeof(buf))) > 0) 285 (void)write(2, buf, n); 286 exit(1); 287 } 288 } 289 290 /* 291 * hour -- 292 * print out the hour in human form 293 */ 294 const char * 295 hour(h) 296 int h; 297 { 298 static const char *const hours[] = { 299 "midnight", "1am", "2am", "3am", "4am", "5am", 300 "6am", "7am", "8am", "9am", "10am", "11am", 301 "noon", "1pm", "2pm", "3pm", "4pm", "5pm", 302 "6pm", "7pm", "8pm", "9pm", "10pm", "11pm", "midnight" }; 303 304 if (h < 0 || h > 24) 305 return ("BAD TIME"); 306 else 307 return (hours[h]); 308 } 309 310 #ifdef LOG 311 /* 312 * logfile -- 313 * log play of game 314 */ 315 logfile() 316 { 317 struct passwd *pw; 318 FILE *lp; 319 uid_t uid; 320 int lock_cnt; 321 322 if (lp = fopen(_PATH_LOG, "a")) { 323 for (lock_cnt = 0;; ++lock_cnt) { 324 if (!flock(fileno(lp), LOCK_EX)) 325 break; 326 if (lock_cnt == 4) { 327 warnx("log lock"); 328 (void)fclose(lp); 329 return; 330 } 331 sleep((u_int)1); 332 } 333 if (pw = getpwuid(uid = getuid())) 334 fputs(pw->pw_name, lp); 335 else 336 fprintf(lp, "%u", uid); 337 fprintf(lp, "\t%s\t%s\t%s", game, gametty, ctime(&now)); 338 (void)fclose(lp); 339 (void)flock(fileno(lp), LOCK_UN); 340 } 341 } 342 #endif /* LOG */ 343
Indexes created Wed Oct 22 06:10:02 GMT 2025