4 new functions to retrieve single linked list of group and passwd entries

+ a fix to an infinite loop in srv_samr_nt.c caused by misuse of
setgrent/getgrent/endgrent solved by these new functions
(This used to be commit 97dbb54a13e2285f1905ee1ec9aafeebdaee8917)

1 files changed, 185 insertions, 0 deletions

diff --git a/source3/lib/util_getent.c b/source3/lib/util_getent.c
new file mode 100644
index 0000000000..46673d65f3
--- /dev/null
+++ b/source3/lib/util_getent.c
@@ -0,0 +1,185 @@
+/*
+   Unix SMB/Netbios implementation.
+   Version 3.0
+   Samba utility functions
+   Copyright (C) Simo Sorce 2001
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/****************************************************************
+ Returns a single linked list of group entries.
+ Use grent_free() to free it after use.
+****************************************************************/
+struct sys_grent * getgrent_list(void)
+{
+	struct sys_grent *glist;
+	struct sys_grent *gent;
+	struct group *grp;
+	
+	gent = (struct sys_grent *) malloc(sizeof(struct sys_grent));
+	if (gent == NULL) {
+		DEBUG (0, ("Out of memory in getgrent_list!\n"));
+		return NULL;
+	}
+	glist = gent;
+	
+	setgrent();
+	grp = getgrent();
+	while (grp != NULL)
+	{
+		int i,num;
+		
+		bzero (gent, sizeof(struct sys_grent));
+		if (grp->gr_name) gent->gr_name = strdup(grp->gr_name);
+		if (grp->gr_passwd) gent->gr_passwd = strdup(grp->gr_passwd);
+		gent->gr_gid = grp->gr_gid;
+		
+		/* number of strings in gr_mem */
+		for (num = 0; grp->gr_mem[num];	num++);
+		
+		/* alloc space for gr_mem string pointers */
+		gent->gr_mem = (char **) malloc(num+1 * sizeof(char *));
+		if (gent->gr_mem == NULL) {
+			DEBUG(0, ("Out of memory in getgrent_list!\n"));
+			endgrent();
+			grent_free(glist);
+			return NULL;
+		}
+		for (i=0; i < num; i++)
+			gent->gr_mem[i] = strdup(grp->gr_mem[i]);
+		gent->gr_mem[num] = NULL;
+		
+		grp = getgrent();
+		if (grp)
+		{
+			gent->next = (struct sys_grent *) malloc(sizeof(struct sys_grent));
+			if (gent->next == NULL) {
+				DEBUG(0, ("Out of memory in getgrent_list!\n"));
+				endgrent();
+				grent_free(glist);
+				return NULL;
+			}
+			gent = gent->next;
+		}
+	}
+	
+	endgrent();
+	return glist;
+}
+
+/****************************************************************
+ Free the single linked list of group entries made by
+ getgrent_list()
+****************************************************************/
+void grent_free (struct sys_grent *glist)
+{
+	while (glist)
+	{
+		char **ary;
+		struct sys_grent *temp;
+		
+		if (glist->gr_name) free(glist->gr_name);
+		if (glist->gr_passwd) free(glist->gr_passwd);
+		if (glist->gr_mem)
+		{
+			ary = glist->gr_mem;
+			while (*ary)
+			{
+				free(*ary);
+				ary++;
+			}
+			free(glist->gr_mem);
+		}
+		temp = glist->next;
+		free(glist);
+		glist = temp;
+	}
+}
+
+/****************************************************************
+ Returns a single linked list of passwd entries.
+ Use pwent_free() to free it after use.
+****************************************************************/
+struct sys_pwent * getpwent_list(void)
+{
+	struct sys_pwent *plist;
+	struct sys_pwent *pent;
+	struct passwd *pwd;
+	
+	pent = (struct sys_pwent *) malloc(sizeof(struct sys_pwent));
+	if (pent == NULL) {
+		DEBUG (0, ("Out of memory in getpwent_list!\n"));
+		return NULL;
+	}
+	plist = pent;
+	
+	setpwent();
+	pwd = getpwent();
+	while (pwd != NULL)
+	{
+		bzero (pent, sizeof(struct sys_pwent));
+		if (pwd->pw_name) pent->pw_name = strdup(pwd->pw_name);
+		if (pwd->pw_passwd) pent->pw_passwd = strdup(pwd->pw_passwd);
+		pent->pw_uid = pwd->pw_uid;
+		pent->pw_gid = pwd->pw_gid;
+		if (pwd->pw_gecos) pent->pw_name = strdup(pwd->pw_gecos);
+		if (pwd->pw_dir) pent->pw_name = strdup(pwd->pw_dir);
+		if (pwd->pw_shell) pent->pw_name = strdup(pwd->pw_shell);
+
+		
+		pwd = getpwent();
+		if (pwd)
+		{
+			pent->next = (struct sys_pwent *) malloc(sizeof(struct sys_pwent));
+			if (pent->next == NULL) {
+				DEBUG(0, ("Out of memory in getgrent_list!\n"));
+				endpwent();
+				pwent_free(plist);
+				return NULL;
+			}
+			pent = pent->next;
+		}
+	}
+	
+	endpwent();
+	return plist;
+
+}
+
+/****************************************************************
+ Free the single linked list of passwd entries made by
+ getpwent_list()
+****************************************************************/
+void pwent_free (struct sys_pwent *plist)
+{
+	while (plist)
+	{
+		struct sys_pwent *temp;
+		
+		if (plist->pw_name) free(plist->pw_name);
+		if (plist->pw_passwd) free(plist->pw_passwd);
+		if (plist->pw_gecos) free(plist->pw_gecos);
+		if (plist->pw_dir) free(plist->pw_dir);
+		if (plist->pw_shell) free(plist->pw_shell);
+
+		temp = plist->next;
+		free(plist);
+		plist = temp;
+	}
+}
+