1 /* $NetBSD: dm.c,v 1.22 2005/07/02 08:35:29 jmc 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 1.22 2005/07/02 08:35:29 jmc 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(const char *, const char *, const char *); 70 void c_game(const char *, const char *, const char *, const char *); 71 void c_tty(const char *); 72 const char *hour(int); 73 double load(void); 74 void nogamefile(void); 75 void play(char **) __attribute__((__noreturn__)); 76 void read_config(void); 77 int users(void); 78 79 int 80 main(int argc __attribute__((__unused__)), char *argv[]) 81 { 82 char *cp; 83 84 nogamefile(); 85 game = (cp = strrchr(*argv, '/')) ? ++cp : *argv; 86 87 if (!strcmp(game, "dm")) 88 exit(0); 89 90 gametty = ttyname(0); 91 unsetenv("TZ"); 92 (void)time(&now); 93 read_config(); 94 #ifdef LOG 95 logfile(); 96 #endif 97 play(argv); 98 /*NOTREACHED*/ 99 return (0); 100 } 101 102 /* 103 * play -- 104 * play the game 105 */ 106 void 107 play(char **args) 108 { 109 char pbuf[MAXPATHLEN]; 110 111 snprintf(pbuf, sizeof(pbuf), "%s%s", _PATH_HIDE, game); 112 if (priority > 0) /* < 0 requires root */ 113 (void)setpriority(PRIO_PROCESS, 0, priority); 114 execv(pbuf, args); 115 err(1, "%s", pbuf); 116 } 117 118 /* 119 * read_config -- 120 * read through config file, looking for key words. 121 */ 122 void 123 read_config(void) 124 { 125 FILE *cfp; 126 char lbuf[BUFSIZ], f1[40], f2[40], f3[40], f4[40], f5[40]; 127 128 if (!(cfp = fopen(_PATH_CONFIG, "r"))) 129 return; 130 while (fgets(lbuf, sizeof(lbuf), cfp)) 131 switch (*lbuf) { 132 case 'b': /* badtty */ 133 if (sscanf(lbuf, "%s%s", f1, f2) != 2 || 134 strcasecmp(f1, "badtty")) 135 break; 136 c_tty(f2); 137 break; 138 case 'g': /* game */ 139 if (sscanf(lbuf, "%s%s%s%s%s", 140 f1, f2, f3, f4, f5) != 5 || strcasecmp(f1, "game")) 141 break; 142 c_game(f2, f3, f4, f5); 143 break; 144 case 't': /* time */ 145 if (sscanf(lbuf, "%s%s%s%s", f1, f2, f3, f4) != 4 || 146 strcasecmp(f1, "time")) 147 break; 148 c_day(f2, f3, f4); 149 } 150 (void)fclose(cfp); 151 } 152 153 /* 154 * c_day -- 155 * if day is today, see if okay to play 156 */ 157 void 158 c_day(const char *s_day, const char *s_start, const char *s_stop) 159 { 160 static const char *const days[] = { 161 "sunday", "monday", "tuesday", "wednesday", 162 "thursday", "friday", "saturday", 163 }; 164 static struct tm *ct; 165 int start, stop; 166 167 if (!ct) 168 ct = localtime(&now); 169 if (strcasecmp(s_day, days[ct->tm_wday])) 170 return; 171 if (!isdigit((unsigned char)*s_start) || 172 !isdigit((unsigned char)*s_stop)) 173 return; 174 start = atoi(s_start); 175 stop = atoi(s_stop); 176 if (ct->tm_hour >= start && ct->tm_hour < stop) { 177 if (start == 0 && stop == 24) 178 errx(0, "Sorry, games are not available today."); 179 else 180 errx(0, "Sorry, games are not available from %s to %s today.", 181 hour(start), hour(stop)); 182 } 183 } 184 185 /* 186 * c_tty -- 187 * decide if this tty can be used for games. 188 */ 189 void 190 c_tty(const char *tty) 191 { 192 static int first = 1; 193 static char *p_tty; 194 195 if (first) { 196 p_tty = strrchr(gametty, '/'); 197 first = 0; 198 } 199 200 if (!strcmp(gametty, tty) || (p_tty && !strcmp(p_tty, tty))) 201 errx(1, "Sorry, you may not play games on %s.", gametty); 202 } 203 204 /* 205 * c_game -- 206 * see if game can be played now. 207 */ 208 void 209 c_game(const char *s_game, const char *s_load, const char *s_users, 210 const char *s_priority) 211 { 212 static int found; 213 214 if (found) 215 return; 216 if (strcmp(game, s_game) && strcasecmp("default", s_game)) 217 return; 218 ++found; 219 if (isdigit((unsigned char)*s_load) && atoi(s_load) < load()) 220 errx(0, "Sorry, the load average is too high right now."); 221 if (isdigit((unsigned char)*s_users) && atoi(s_users) <= users()) 222 errx(0, "Sorry, there are too many users logged on right now."); 223 if (isdigit((unsigned char)*s_priority)) 224 priority = atoi(s_priority); 225 } 226 227 /* 228 * load -- 229 * return 15 minute load average 230 */ 231 double 232 load(void) 233 { 234 double avenrun[3]; 235 236 if (getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])) < 0) 237 err(1, "getloadavg() failed"); 238 return (avenrun[2]); 239 } 240 241 /* 242 * users -- 243 * return current number of users 244 * todo: check idle time; if idle more than X minutes, don't 245 * count them. 246 */ 247 int 248 users(void) 249 { 250 static struct utmpentry *ohead = NULL; 251 struct utmpentry *ep; 252 int nusers; 253 254 nusers = getutentries(NULL, &ep); 255 if (ep != ohead) { 256 freeutentries(ep); 257 ohead = ep; 258 } 259 return nusers; 260 } 261 262 void 263 nogamefile(void) 264 { 265 int fd, n; 266 char buf[BUFSIZ]; 267 268 if ((fd = open(_PATH_NOGAMES, O_RDONLY, 0)) >= 0) { 269 #define MESG "Sorry, no games right now.\n\n" 270 (void)write(2, MESG, sizeof(MESG) - 1); 271 while ((n = read(fd, buf, sizeof(buf))) > 0) 272 (void)write(2, buf, n); 273 exit(1); 274 } 275 } 276 277 /* 278 * hour -- 279 * print out the hour in human form 280 */ 281 const char * 282 hour(int h) 283 { 284 static const char *const hours[] = { 285 "midnight", "1am", "2am", "3am", "4am", "5am", 286 "6am", "7am", "8am", "9am", "10am", "11am", 287 "noon", "1pm", "2pm", "3pm", "4pm", "5pm", 288 "6pm", "7pm", "8pm", "9pm", "10pm", "11pm", "midnight" }; 289 290 if (h < 0 || h > 24) 291 return ("BAD TIME"); 292 else 293 return (hours[h]); 294 } 295 296 #ifdef LOG 297 /* 298 * logfile -- 299 * log play of game 300 */ 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((u_int)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)fclose(lp); 325 (void)flock(fileno(lp), LOCK_UN); 326 } 327 } 328 #endif /* LOG */ 329