text: /*-
   * Copyright (C) 1996
   *	David L. Nugent.  All rights reserved.
   *
   * 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.
   *
   * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT 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 DAVID L. NUGENT 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.
   */
  
  #ifndef lint
  static const char rcsid[] =
    "$FreeBSD: src/usr.sbin/pw/pw_group.c,v 1.14 2004/01/11 18:28:08 iedowse Exp $";
  #endif /* not lint */
  
  #include <ctype.h>
  #include <err.h>
  #include <termios.h>
  #include <unistd.h>
  
  #include "pw.h"
  #include "bitmap.h"
  
  
  static int      print_group(struct group * grp, int pretty);
  static gid_t    gr_gidpolicy(struct userconf * cnf, struct cargs * args);
  
  int
  pw_group(struct userconf * cnf, int mode, struct cargs * args)
  {
  	int		rc;
  	struct carg    *a_name = getarg(args, 'n');
  	struct carg    *a_gid = getarg(args, 'g');
  	struct carg    *arg;
  	struct group   *grp = NULL;
  	int	        grmembers = 0;
  	char           **members = NULL;
  
  	static struct group fakegroup =
  	{
  		"nogroup",
  		"*",
  		-1,
  		NULL
  	};
  
  	if (mode == M_LOCK || mode == M_UNLOCK)
  		errx(EX_USAGE, "'lock' command is not available for groups");
  
  	/*
  	 * With M_NEXT, we only need to return the
  	 * next gid to stdout
  	 */
  	if (mode == M_NEXT) {
  		gid_t next = gr_gidpolicy(cnf, args);
  		if (getarg(args, 'q'))
  			return next;
  		printf("%ld\n", (long)next);
  		return EXIT_SUCCESS;
  	}
  
  	if (mode == M_PRINT && getarg(args, 'a')) {
  		int             pretty = getarg(args, 'P') != NULL;
  
  		SETGRENT();
  		while ((grp = GETGRENT()) != NULL)
  			print_group(grp, pretty);
  		ENDGRENT();
  		return EXIT_SUCCESS;
  	}
  	if (a_gid == NULL) {
  		if (a_name == NULL)
  			errx(EX_DATAERR, "group name or id required");
  
  		if (mode != M_ADD && grp == NULL && isdigit((unsigned char)*a_name->val)) {
  			(a_gid = a_name)->ch = 'g';
  			a_name = NULL;
  		}
  	}
  	grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val));
  
  	if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
  		if (a_name == NULL && grp == NULL)	/* Try harder */
  			grp = GETGRGID(atoi(a_gid->val));
  
  		if (grp == NULL) {
  			if (mode == M_PRINT && getarg(args, 'F')) {
  				char	*fmems[1];
  				fmems[0] = NULL;
  				fakegroup.gr_name = a_name ? a_name->val : "nogroup";
  				fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
  				fakegroup.gr_mem = fmems;
  				return print_group(&fakegroup, getarg(args, 'P') != NULL);
  			}
  			errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val);
  		}
  		if (a_name == NULL)	/* Needed later */
  			a_name = addarg(args, 'n', grp->gr_name);
  
  		/*
  		 * Handle deletions now
  		 */
  		if (mode == M_DELETE) {
  			gid_t           gid = grp->gr_gid;
  
  			rc = delgrent(grp);
  			if (rc == -1)
  				err(EX_IOERR, "group '%s' not available (NIS?)", grp->gr_name);
  			else if (rc != 0) {
  				warn("group update");
  				return EX_IOERR;
  			}
  			pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
  			return EXIT_SUCCESS;
  		} else if (mode == M_PRINT)
  			return print_group(grp, getarg(args, 'P') != NULL);
  
  		if (a_gid)
  			grp->gr_gid = (gid_t) atoi(a_gid->val);
  
  		if ((arg = getarg(args, 'l')) != NULL)
  			grp->gr_name = pw_checkname((u_char *)arg->val, 0);
  	} else {
  		if (a_name == NULL)	/* Required */
  			errx(EX_DATAERR, "group name required");
  		else if (grp != NULL)	/* Exists */
  			errx(EX_DATAERR, "group name `%s' already exists", a_name->val);
  
  		extendarray(&members, &grmembers, 200);
  		members[0] = NULL;
  		grp = &fakegroup;
  		grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
  		grp->gr_passwd = "*";
  		grp->gr_gid = gr_gidpolicy(cnf, args);
  		grp->gr_mem = members;
  	}
  
  	/*
  	 * This allows us to set a group password Group passwords is an
  	 * antique idea, rarely used and insecure (no secure database) Should
  	 * be discouraged, but it is apparently still supported by some
  	 * software.
  	 */
  
  	if ((arg = getarg(args, 'h')) != NULL ||
  	    (arg = getarg(args, 'H')) != NULL) {
  		if (strcmp(arg->val, "-") == 0)
  			grp->gr_passwd = "*";	/* No access */
  		else {
  			int             fd = atoi(arg->val);
  			int		precrypt = (arg->ch == 'H');
  			int             b;
  			int             istty = isatty(fd);
  			struct termios  t;
  			char           *p, line[256];
  
  			if (istty) {
  				if (tcgetattr(fd, &t) == -1)
  					istty = 0;
  				else {
  					struct termios  n = t;
  
  					/* Disable echo */
  					n.c_lflag &= ~(ECHO);
  					tcsetattr(fd, TCSANOW, &n);
  					printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
  					fflush(stdout);
  				}
  			}
  			b = read(fd, line, sizeof(line) - 1);
  			if (istty) {	/* Restore state */
  				tcsetattr(fd, TCSANOW, &t);
  				fputc('\n', stdout);
  				fflush(stdout);
  			}
  			if (b < 0) {
  				warn("-h file descriptor");
  				return EX_OSERR;
  			}
  			line[b] = '\0';
  			if ((p = strpbrk(line, " \t\r\n")) != NULL)
  				*p = '\0';
  			if (!*line)
  				errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
  			if (precrypt) {
  				if (strchr(line, ':') != NULL)
  					return EX_DATAERR;
  				grp->gr_passwd = line;
  			} else
  				grp->gr_passwd = pw_pwcrypt(line);
  		}
  	}
  
  	if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
  		int	i = 0;
  		char   *p;
  		struct passwd	*pwd;
  
  		/* Make sure this is not stay NULL with -M "" */
  		extendarray(&members, &grmembers, 200);
  		if (arg->ch == 'm') {
  			int	k = 0;
  
  			while (grp->gr_mem[k] != NULL) {
  				if (extendarray(&members, &grmembers, i + 2) != -1) {
  					members[i++] = grp->gr_mem[k];
  				}
  				k++;
  			}
  		}
  		for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
  			int     j;
  			if ((pwd = GETPWNAM(p)) == NULL) {
  				if (!isdigit((unsigned char)*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
  					errx(EX_NOUSER, "user `%s' does not exist", p);
  			}
  			/*
  			 * Check for duplicates
  			 */
  			for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
  				;
  			if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
  				members[i++] = newstr(pwd->pw_name);
  		}
  		while (i < grmembers)
  			members[i++] = NULL;
  		grp->gr_mem = members;
  	}
  
  	if (getarg(args, 'N') != NULL)
  		return print_group(grp, getarg(args, 'P') != NULL);
  
  	if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
  		if (rc == -1)
  			warnx("group '%s' already exists", grp->gr_name);
  		else
  			warn("group update");
  		return EX_IOERR;
  	} else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) {
  		if (rc == -1)
  			warnx("group '%s' not available (NIS?)", grp->gr_name);
  		else
  			warn("group update");
  		return EX_IOERR;
  	}
  	/* grp may have been invalidated */
  	if ((grp = GETGRNAM(a_name->val)) == NULL)
  		errx(EX_SOFTWARE, "group disappeared during update");
  
  	pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
  
  	if (members)
  		free(members);
  
  	return EXIT_SUCCESS;
  }
  
  
  static          gid_t
  gr_gidpolicy(struct userconf * cnf, struct cargs * args)
  {
  	struct group   *grp;
  	gid_t           gid = (gid_t) - 1;
  	struct carg    *a_gid = getarg(args, 'g');
  
  	/*
  	 * Check the given gid, if any
  	 */
  	if (a_gid != NULL) {
  		gid = (gid_t) atol(a_gid->val);
  
  		if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL)
  			errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid);
  	} else {
  		struct bitmap   bm;
  
  		/*
  		 * We need to allocate the next available gid under one of
  		 * two policies a) Grab the first unused gid b) Grab the
  		 * highest possible unused gid
  		 */
  		if (cnf->min_gid >= cnf->max_gid) {	/* Sanity claus^H^H^H^Hheck */
  			cnf->min_gid = 1000;
  			cnf->max_gid = 32000;
  		}
  		bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
  
  		/*
  		 * Now, let's fill the bitmap from the password file
  		 */
  		SETGRENT();
  		while ((grp = GETGRENT()) != NULL)
  			if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
                              (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
  				bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
  		ENDGRENT();
  
  		/*
  		 * Then apply the policy, with fallback to reuse if necessary
  		 */
  		if (cnf->reuse_gids)
  			gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
  		else {
  			gid = (gid_t) (bm_lastset(&bm) + 1);
  			if (!bm_isset(&bm, gid))
  				gid += cnf->min_gid;
  			else
  				gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
  		}
  
  		/*
  		 * Another sanity check
  		 */
  		if (gid < cnf->min_gid || gid > cnf->max_gid)
  			errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
  		bm_dealloc(&bm);
  	}
  	return gid;
  }
  
  
  static int
  print_group(struct group * grp, int pretty)
  {
  	if (!pretty) {
  		int		buflen = 0;
  		char           *buf = NULL;
  
  		fmtgrent(&buf, &buflen, grp);
  		fputs(buf, stdout);
  		free(buf);
  	} else {
  		int             i;
  
  		printf("Group Name: %-15s   #%lu\n"
  		       "   Members: ",
  		       grp->gr_name, (long) grp->gr_gid);
  		for (i = 0; grp->gr_mem[i]; i++)
  			printf("%s%s", i ? "," : "", grp->gr_mem[i]);
  		fputs("\n\n", stdout);
  	}
  	return EXIT_SUCCESS;
  }
  