text: /*
   * Copyright (c) 1989, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #if 0
  #ifndef lint
  static char sccsid[] = "@(#)util.c	8.3 (Berkeley) 4/28/95";
  #endif
  #endif
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  
  #include <sys/param.h>
  #include <sys/socket.h>
  #include <sys/stat.h>
  #include <ctype.h>
  #include <db.h>
  #include <err.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <paths.h>
  #include <pwd.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  #include <utmpx.h>
  #include "finger.h"
  #include "pathnames.h"
  
  static void	 find_idle_and_ttywrite(WHERE *);
  static void	 userinfo(PERSON *, struct passwd *);
  static WHERE	*walloc(PERSON *);
  
  int
  match(struct passwd *pw, const char *user)
  {
  	char *p, *t;
  	char name[1024];
  
  	if (!strcasecmp(pw->pw_name, user))
  		return(1);
  
  	/*
  	 * XXX
  	 * Why do we skip asterisks!?!?
  	 */
  	(void)strncpy(p = tbuf, pw->pw_gecos, sizeof(tbuf));
  	tbuf[sizeof(tbuf) - 1] = '\0';
  	if (*p == '*')
  		++p;
  
  	/* Ampersands get replaced by the login name. */
  	if ((p = strtok(p, ",")) == NULL)
  		return(0);
  
  	for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
  		if (*t == '&') { 
  			(void)strncpy(t, pw->pw_name, 
  			    sizeof(name) - (t - name));
  			name[sizeof(name) - 1] = '\0';
  			while (t < &name[sizeof(name) - 1] && *++t)
  				continue;
  		} else {
  			++t;
  		}
  	}
  	*t = '\0';
  	for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL)
  		if (!strcasecmp(p, user))
  			return(1);
  	return(0);
  }
  
  void
  enter_lastlog(PERSON *pn)
  {
  	WHERE *w;
  	struct utmpx *ut = NULL;
  	char doit = 0;
  
  	if (setutxdb(UTXDB_LASTLOGIN, NULL) == 0)
  		ut = getutxuser(pn->name);
  	if ((w = pn->whead) == NULL)
  		doit = 1;
  	else if (ut != NULL && ut->ut_type == USER_PROCESS) {
  		/* if last login is earlier than some current login */
  		for (; !doit && w != NULL; w = w->next)
  			if (w->info == LOGGEDIN &&
  			    w->loginat < ut->ut_tv.tv_sec)
  				doit = 1;
  		/*
  		 * and if it's not any of the current logins
  		 * can't use time comparison because there may be a small
  		 * discrepancy since login calls time() twice
  		 */
  		for (w = pn->whead; doit && w != NULL; w = w->next)
  			if (w->info == LOGGEDIN &&
  			    strcmp(w->tty, ut->ut_line) == 0)
  				doit = 0;
  	}
  	if (ut != NULL && doit) {
  		w = walloc(pn);
  		w->info = LASTLOG;
  		strcpy(w->tty, ut->ut_line);
  		strcpy(w->host, ut->ut_host);
  		w->loginat = ut->ut_tv.tv_sec;
  	}
  	endutxent();
  }
  
  void
  enter_where(struct utmpx *ut, PERSON *pn)
  {
  	WHERE *w;
  
  	w = walloc(pn);
  	w->info = LOGGEDIN;
  	strcpy(w->tty, ut->ut_line);
  	strcpy(w->host, ut->ut_host);
  	w->loginat = ut->ut_tv.tv_sec;
  	find_idle_and_ttywrite(w);
  }
  
  PERSON *
  enter_person(struct passwd *pw)
  {
  	DBT data, key;
  	PERSON *pn;
  
  	if (db == NULL &&
  	    (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
  		err(1, NULL);
  
  	key.data = pw->pw_name;
  	key.size = strlen(pw->pw_name);
  
  	switch ((*db->get)(db, &key, &data, 0)) {
  	case 0:
  		memmove(&pn, data.data, sizeof pn);
  		return (pn);
  	default:
  	case -1:
  		err(1, "db get");
  		/* NOTREACHED */
  	case 1:
  		++entries;
  		pn = palloc();
  		userinfo(pn, pw);
  		pn->whead = NULL;
  
  		data.size = sizeof(PERSON *);
  		data.data = &pn;
  		if ((*db->put)(db, &key, &data, 0))
  			err(1, "db put");
  		return (pn);
  	}
  }
  
  PERSON *
  find_person(char *name)
  {
  	struct passwd *pw;
  
  	DBT data, key;
  	PERSON *p;
  
  	if (!db)
  		return(NULL);
  
  	if ((pw = getpwnam(name)) && hide(pw))
  		return(NULL);
  
  	key.data = name;
  	key.size = strlen(name);
  
  	if ((*db->get)(db, &key, &data, 0))
  		return (NULL);
  	memmove(&p, data.data, sizeof p);
  	return (p);
  }
  
  PERSON *
  palloc(void)
  {
  	PERSON *p;
  
  	if ((p = malloc(sizeof(PERSON))) == NULL)
  		err(1, NULL);
  	return(p);
  }
  
  static WHERE *
  walloc(PERSON *pn)
  {
  	WHERE *w;
  
  	if ((w = malloc(sizeof(WHERE))) == NULL)
  		err(1, NULL);
  	if (pn->whead == NULL)
  		pn->whead = pn->wtail = w;
  	else {
  		pn->wtail->next = w;
  		pn->wtail = w;
  	}
  	w->next = NULL;
  	return(w);
  }
  
  char *
  prphone(char *num)
  {
  	char *p;
  	int len;
  	static char pbuf[20];
  
  	/* don't touch anything if the user has their own formatting */
  	for (p = num; *p; ++p)
  		if (!isdigit(*p))
  			return(num);
  	len = p - num;
  	p = pbuf;
  	switch(len) {
  	case 11:			/* +0-123-456-7890 */
  		*p++ = '+';
  		*p++ = *num++;
  		*p++ = '-';
  		/* FALLTHROUGH */
  	case 10:			/* 012-345-6789 */
  		*p++ = *num++;
  		*p++ = *num++;
  		*p++ = *num++;
  		*p++ = '-';
  		/* FALLTHROUGH */
  	case 7:				/* 012-3456 */
  		*p++ = *num++;
  		*p++ = *num++;
  		*p++ = *num++;
  		break;
  	case 5:				/* x0-1234 */
  	case 4:				/* x1234 */
  		*p++ = 'x';
  		*p++ = *num++;
  		break;
  	default:
  		return(num);
  	}
  	if (len != 4) {
  	    *p++ = '-';
  	    *p++ = *num++;
  	}
  	*p++ = *num++;
  	*p++ = *num++;
  	*p++ = *num++;
  	*p = '\0';
  	return(pbuf);
  }
  
  static void
  find_idle_and_ttywrite(WHERE *w)
  {
  	struct stat sb;
  	time_t touched;
  	int error;
  
  	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
  
  	error = stat(tbuf, &sb);
  	if (error < 0 && errno == ENOENT) {
  		/*
  		 * The terminal listed is not actually a terminal (i.e.,
  		 * ":0").  This is a failure, so we'll skip printing
  		 * out the idle time, which is non-ideal but better
  		 * than a bogus warning and idle time.
  		 */
  		w->idletime = -1;
  		return;
  	} else if (error < 0) {
  		warn("%s", tbuf);
  		w->idletime = -1;
  		return;
  	}
  	touched = sb.st_atime;
  	if (touched < w->loginat) {
  		/* tty untouched since before login */
  		touched = w->loginat;
  	}
  	w->idletime = now < touched ? 0 : now - touched;
  
  #define	TALKABLE	0220		/* tty is writable if 220 mode */
  	w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
  }
  
  static void
  userinfo(PERSON *pn, struct passwd *pw)
  {
  	char *p, *t;
  	char *bp, name[1024];
  	struct stat sb;
  
  	pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
  
  	pn->uid = pw->pw_uid;
  	if ((pn->name = strdup(pw->pw_name)) == NULL)
  		err(1, "strdup failed");
  	if ((pn->dir = strdup(pw->pw_dir)) == NULL)
  		err(1, "strdup failed");
  	if ((pn->shell = strdup(pw->pw_shell)) == NULL)
  		err(1, "strdup failed");
  
  	/* why do we skip asterisks!?!? */
  	(void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
  	tbuf[sizeof(tbuf) - 1] = '\0';
  	if (*bp == '*')
  		++bp;
  
  	/* ampersands get replaced by the login name */
  	if (!(p = strsep(&bp, ",")))
  		return;
  	for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
  		if (*t == '&') {
  			(void)strncpy(t, pw->pw_name, 
  			    sizeof(name) - (t - name));
  			name[sizeof(name) - 1] = '\0';
  			if (islower(*t))
  				*t = toupper(*t);
  			while (t < &name[sizeof(name) - 1] && *++t)
  				continue;
  		} else {
  			++t;
  		}
  	}
  	*t = '\0';
  	if ((pn->realname = strdup(name)) == NULL)
  		err(1, "strdup failed");
  	pn->office = ((p = strsep(&bp, ",")) && *p) ?
  	    strdup(p) : NULL;
  	pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
  	    strdup(p) : NULL;
  	pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
  	    strdup(p) : NULL;
  	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pw->pw_name);
  	pn->mailrecv = -1;		/* -1 == not_valid */
  	if (stat(tbuf, &sb) < 0) {
  		if (errno != ENOENT) {
  			warn("%s", tbuf);
  			return;
  		}
  	} else if (sb.st_size != 0) {
  		pn->mailrecv = sb.st_mtime;
  		pn->mailread = sb.st_atime;
  	}
  }
  
  /*
   * Is this user hiding from finger?
   * If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide).
   * Nobody can hide from root.
   */
  
  int
  hide(struct passwd *pw)
  {
  	struct stat st;
  	char buf[MAXPATHLEN];
  
  	if (invoker_root || !pw->pw_dir)
  		return 0;
  
  	snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, _PATH_NOFINGER);
  
  	if (stat(buf, &st) == 0)
  		return 1;
  
  	return 0;
  }
  