1 /* $NetBSD: dm.c,v 1.18 2003/08/07 09:37:11 agc 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1987, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)dm.c 8.1 (Berkeley) 5/31/93"; 41 #else 42 __RCSID("$NetBSD: dm.c,v 1.18 2003/08/07 09:37:11 agc Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/file.h> 48 #include <sys/time.h> 49 #include <sys/resource.h> 50 51 #include <err.h> 52 #include <ctype.h> 53 #include <errno.h> 54 #include <pwd.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <time.h> 59 #include <unistd.h> 60 61 #include "utmpentry.h" 62 #include "pathnames.h" 63 64 static time_t now; /* current time value */ 65 static int priority = 0; /* priority game runs at */ 66 static char *game, /* requested game */ 67 *gametty; /* from tty? */ 68 69 void c_day __P((const char *, const char *, const char *)); 70 void c_game __P((const char *, const char *, const char *, const char *)); 71 void c_tty __P((const char *)); 72 const char *hour __P((int)); 73 double load __P((void)); 74 int main __P((int, char *[])); 75 void nogamefile __P((void)); 76 void play __P((char **)) __attribute__((__noreturn__)); 77 void read_config __P((void)); 78 int users __P((void)); 79 80 int 81 main(argc, argv) 82 int argc; 83 char *argv[]; 84 { 85 char *cp; 86 87 nogamefile(); 88 game = (cp = strrchr(*argv, '/')) ? ++cp : *argv; 89 90 if (!strcmp(game, "dm")) 91 exit(0); 92 93 gametty = ttyname(0); 94 unsetenv("TZ"); 95 (void)time(&now); 96 read_config(); 97 #ifdef LOG 98 logfile(); 99 #endif 100 play(argv); 101 /*NOTREACHED*/ 102 return (0); 103 } 104 105 /* 106 * play -- 107 * play the game 108 */ 109 void 110 play(args) 111 char **args; 112 { 113 char pbuf[MAXPATHLEN]; 114 115 snprintf(pbuf, sizeof(pbuf), "%s%s", _PATH_HIDE, game); 116 if (priority > 0) /* < 0 requires root */ 117 (void)setpriority(PRIO_PROCESS, 0, priority); 118 execv(pbuf, args); 119 err(1, "%s", pbuf); 120 } 121 122 /* 123 * read_config -- 124 * read through config file, looking for key words. 125 */ 126 void 127 read_config() 128 { 129 FILE *cfp; 130 char lbuf[BUFSIZ], f1[40], f2[40], f3[40], f4[40], f5[40]; 131 132 if (!(cfp = fopen(_PATH_CONFIG, "r"))) 133 return; 134 while (fgets(lbuf, sizeof(lbuf), cfp)) 135 switch (*lbuf) { 136 case 'b': /* badtty */ 137 if (sscanf(lbuf, "%s%s", f1, f2) != 2 || 138 strcasecmp(f1, "badtty")) 139 break; 140 c_tty(f2); 141 break; 142 case 'g': /* game */ 143 if (sscanf(lbuf, "%s%s%s%s%s", 144 f1, f2, f3, f4, f5) != 5 || strcasecmp(f1, "game")) 145 break; 146 c_game(f2, f3, f4, f5); 147 break; 148 case 't': /* time */ 149 if (sscanf(lbuf, "%s%s%s%s", f1, f2, f3, f4) != 4 || 150 strcasecmp(f1, "time")) 151 break; 152 c_day(f2, f3, f4); 153 } 154 (void)fclose(cfp); 155 } 156 157 /* 158 * c_day -- 159 * if day is today, see if okay to play 160 */ 161 void 162 c_day(s_day, s_start, s_stop) 163 const char *s_day, *s_start, *s_stop; 164 { 165 static const char *const days[] = { 166 "sunday", "monday", "tuesday", "wednesday", 167 "thursday", "friday", "saturday", 168 }; 169 static struct tm *ct; 170 int start, stop; 171 172 if (!ct) 173 ct = localtime(&now); 174 if (strcasecmp(s_day, days[ct->tm_wday])) 175 return; 176 if (!isdigit(*s_start) || !isdigit(*s_stop)) 177 return; 178 start = atoi(s_start); 179 stop = atoi(s_stop); 180 if (ct->tm_hour >= start && ct->tm_hour < stop) { 181 if (start == 0 && stop == 24) 182 errx(0, "Sorry, games are not available today."); 183 else 184 errx(0, "Sorry, games are not available from %s to %s today.", 185 hour(start), hour(stop)); 186 } 187 } 188 189 /* 190 * c_tty -- 191 * decide if this tty can be used for games. 192 */ 193 void 194 c_tty(tty) 195 const char *tty; 196 { 197 static int first = 1; 198 static char *p_tty; 199 200 if (first) { 201 p_tty = strrchr(gametty, '/'); 202 first = 0; 203 } 204 205 if (!strcmp(gametty, tty) || (p_tty && !strcmp(p_tty, tty))) 206 errx(1, "Sorry, you may not play games on %s.", gametty); 207 } 208 209 /* 210 * c_game -- 211 * see if game can be played now. 212 */ 213 void 214 c_game(s_game, s_load, s_users, s_priority) 215 const char *s_game, *s_load, *s_users, *s_priority; 216 { 217 static int found; 218 219 if (found) 220 return; 221 if (strcmp(game, s_game) && strcasecmp("default", s_game)) 222 return; 223 ++found; 224 if (isdigit(*s_load) && atoi(s_load) < load()) 225 errx(0, "Sorry, the load average is too high right now."); 226 if (isdigit(*s_users) && atoi(s_users) <= users()) 227 errx(0, "Sorry, there are too many users logged on right now."); 228 if (isdigit(*s_priority)) 229 priority = atoi(s_priority); 230 } 231 232 /* 233 * load -- 234 * return 15 minute load average 235 */ 236 double 237 load() 238 { 239 double avenrun[3]; 240 241 if (getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])) < 0) 242 err(1, "getloadavg() failed"); 243 return (avenrun[2]); 244 } 245 246 /* 247 * users -- 248 * return current number of users 249 * todo: check idle time; if idle more than X minutes, don't 250 * count them. 251 */ 252 int 253 users() 254 { 255 static struct utmpentry *ohead = NULL; 256 struct utmpentry *ep; 257 int nusers; 258 259 nusers = getutentries(NULL, &ep); 260 if (ep != ohead) { 261 freeutentries(ep); 262 ohead = ep; 263 } 264 return nusers; 265 } 266 267 void 268 nogamefile() 269 { 270 int fd, n; 271 char buf[BUFSIZ]; 272 273 if ((fd = open(_PATH_NOGAMES, O_RDONLY, 0)) >= 0) { 274 #define MESG "Sorry, no games right now.\n\n" 275 (void)write(2, MESG, sizeof(MESG) - 1); 276 while ((n = read(fd, buf, sizeof(buf))) > 0) 277 (void)write(2, buf, n); 278 exit(1); 279 } 280 } 281 282 /* 283 * hour -- 284 * print out the hour in human form 285 */ 286 const char * 287 hour(h) 288 int h; 289 { 290 static const char *const hours[] = { 291 "midnight", "1am", "2am", "3am", "4am", "5am", 292 "6am", "7am", "8am", "9am", "10am", "11am", 293 "noon", "1pm", "2pm", "3pm", "4pm", "5pm", 294 "6pm", "7pm", "8pm", "9pm", "10pm", "11pm", "midnight" }; 295 296 if (h < 0 || h > 24) 297 return ("BAD TIME"); 298 else 299 return (hours[h]); 300 } 301 302 #ifdef LOG 303 /* 304 * logfile -- 305 * log play of game 306 */ 307 logfile() 308 { 309 struct passwd *pw; 310 FILE *lp; 311 uid_t uid; 312 int lock_cnt; 313 314 if (lp = fopen(_PATH_LOG, "a")) { 315 for (lock_cnt = 0;; ++lock_cnt) { 316 if (!flock(fileno(lp), LOCK_EX)) 317 break; 318 if (lock_cnt == 4) { 319 warnx("log lock"); 320 (void)fclose(lp); 321 return; 322 } 323 sleep((u_int)1); 324 } 325 if (pw = getpwuid(uid = getuid())) 326 fputs(pw->pw_name, lp); 327 else 328 fprintf(lp, "%u", uid); 329 fprintf(lp, "\t%s\t%s\t%s", game, gametty, ctime(&now)); 330 (void)fclose(lp); 331 (void)flock(fileno(lp), LOCK_UN); 332 } 333 } 334 #endif /* LOG */ 335