1 /* $NetBSD: dm.c,v 1.29 2009/08/27 00:22:28 dholland 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\ 35 The Regents of the University of California. All rights reserved."); 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 1.29 2009/08/27 00:22:28 dholland 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 static void c_day(const char *, const char *, const char *); 70 static void c_game(const char *, const char *, const char *, const char *); 71 static void c_tty(const char *); 72 static const char *hour(int); 73 static double load(void); 74 static void nogamefile(void); 75 static void play(char **) __dead; 76 static void read_config(void); 77 static int users(void); 78 79 #ifdef LOG 80 static void logfile(void); 81 #endif 82 83 int 84 main(int argc __unused, char *argv[]) 85 { 86 char *cp; 87 88 nogamefile(); 89 game = (cp = strrchr(*argv, '/')) ? ++cp : *argv; 90 91 if (!strcmp(game, "dm")) 92 exit(0); 93 94 gametty = ttyname(0); 95 unsetenv("TZ"); 96 (void)time(&now); 97 read_config(); 98 #ifdef LOG 99 logfile(); 100 #endif 101 play(argv); 102 /*NOTREACHED*/ 103 return (0); 104 } 105 106 /* 107 * play -- 108 * play the game 109 */ 110 static void 111 play(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 static void 127 read_config(void) 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, "%39s%39s", f1, f2) != 2 || 138 strcasecmp(f1, "badtty")) 139 break; 140 c_tty(f2); 141 break; 142 case 'g': /* game */ 143 if (sscanf(lbuf, "%39s%39s%39s%39s%39s", 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, "%39s%39s%39s%39s", 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 static void 162 c_day(const char *s_day, const char *s_start, const char *s_stop) 163 { 164 static const char *const days[] = { 165 "sunday", "monday", "tuesday", "wednesday", 166 "thursday", "friday", "saturday", 167 }; 168 static struct tm *ct; 169 int start, stop; 170 171 if (!ct) 172 ct = localtime(&now); 173 if (strcasecmp(s_day, days[ct->tm_wday])) 174 return; 175 if (!isdigit((unsigned char)*s_start) || 176 !isdigit((unsigned char)*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 static void 194 c_tty(const char *tty) 195 { 196 static int first = 1; 197 static char *p_tty; 198 199 if (first) { 200 p_tty = strrchr(gametty, '/'); 201 first = 0; 202 } 203 204 if (!strcmp(gametty, tty) || (p_tty && !strcmp(p_tty, tty))) 205 errx(1, "Sorry, you may not play games on %s.", gametty); 206 } 207 208 /* 209 * c_game -- 210 * see if game can be played now. 211 */ 212 static void 213 c_game(const char *s_game, const char *s_load, const char *s_users, 214 const char *s_priority) 215 { 216 static int found; 217 218 if (found) 219 return; 220 if (strcmp(game, s_game) && strcasecmp("default", s_game)) 221 return; 222 ++found; 223 if (isdigit((unsigned char)*s_load) && atoi(s_load) < load()) 224 errx(0, "Sorry, the load average is too high right now."); 225 if (isdigit((unsigned char)*s_users) && atoi(s_users) <= users()) 226 errx(0, "Sorry, there are too many users logged on right now."); 227 if (isdigit((unsigned char)*s_priority)) 228 priority = atoi(s_priority); 229 } 230 231 /* 232 * load -- 233 * return 15 minute load average 234 */ 235 static double 236 load(void) 237 { 238 double avenrun[3]; 239 240 if (getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])) < 0) 241 err(1, "getloadavg() failed"); 242 return (avenrun[2]); 243 } 244 245 /* 246 * users -- 247 * return current number of users 248 * todo: check idle time; if idle more than X minutes, don't 249 * count them. 250 */ 251 static int 252 users(void) 253 { 254 struct utmpentry *ep; 255 int nusers; 256 257 nusers = getutentries(NULL, &ep); 258 return nusers; 259 } 260 261 static void 262 nogamefile(void) 263 { 264 int fd, n; 265 char buf[BUFSIZ]; 266 267 if ((fd = open(_PATH_NOGAMES, O_RDONLY, 0)) >= 0) { 268 #define MESG "Sorry, no games right now.\n\n" 269 (void)write(2, MESG, sizeof(MESG) - 1); 270 while ((n = read(fd, buf, sizeof(buf))) > 0) 271 (void)write(2, buf, n); 272 exit(1); 273 } 274 } 275 276 /* 277 * hour -- 278 * print out the hour in human form 279 */ 280 static const char * 281 hour(int h) 282 { 283 static const char *const hours[] = { 284 "midnight", "1am", "2am", "3am", "4am", "5am", 285 "6am", "7am", "8am", "9am", "10am", "11am", 286 "noon", "1pm", "2pm", "3pm", "4pm", "5pm", 287 "6pm", "7pm", "8pm", "9pm", "10pm", "11pm", "midnight" }; 288 289 if (h < 0 || h > 24) 290 return ("BAD TIME"); 291 else 292 return (hours[h]); 293 } 294 295 #ifdef LOG 296 /* 297 * logfile -- 298 * log play of game 299 */ 300 static void 301 logfile(void) 302 { 303 struct passwd *pw; 304 FILE *lp; 305 uid_t uid; 306 int lock_cnt; 307 308 if (lp = fopen(_PATH_LOG, "a")) { 309 for (lock_cnt = 0;; ++lock_cnt) { 310 if (!flock(fileno(lp), LOCK_EX)) 311 break; 312 if (lock_cnt == 4) { 313 warnx("log lock"); 314 (void)fclose(lp); 315 return; 316 } 317 sleep(1); 318 } 319 if (pw = getpwuid(uid = getuid())) 320 fputs(pw->pw_name, lp); 321 else 322 fprintf(lp, "%u", uid); 323 fprintf(lp, "\t%s\t%s\t%s", game, gametty, ctime(&now)); 324 (void)flock(fileno(lp), LOCK_UN); 325 (void)fclose(lp); 326 } 327 } 328 #endif /* LOG */ 329