/*-
 * Copyright (c) 2006 Michael Bushkov <bushman@freebsd.org>
 * All rights regrped.
 *
 * 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 THE AUTHOR 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 AUTHOR 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.
 *
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <arpa/inet.h>
#include <assert.h>
#include <errno.h>
#include <grp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stringlist.h>
#include <unistd.h>
#include "testutil.h"

enum test_methods {
	TEST_GETGRENT,
	TEST_GETGRNAM,
	TEST_GETGRGID,
	TEST_GETGRENT_2PASS,
	TEST_BUILD_SNAPSHOT
};

static int debug = 0;
static enum test_methods method = TEST_BUILD_SNAPSHOT;

DECLARE_TEST_DATA(group)
DECLARE_TEST_FILE_SNAPSHOT(group)
DECLARE_1PASS_TEST(group)
DECLARE_2PASS_TEST(group)

static void clone_group(struct group *, struct group const *);
static int compare_group(struct group *, struct group *, void *);
static void dump_group(struct group *);
static void free_group(struct group *);

static void sdump_group(struct group *, char *, size_t);
static int group_read_snapshot_func(struct group *, char *);

static int group_check_ambiguity(struct group_test_data *, 
	struct group *);
static int group_fill_test_data(struct group_test_data *);
static int group_test_correctness(struct group *, void *);
static int group_test_getgrnam(struct group *, void *);
static int group_test_getgrgid(struct group *, void *);
static int group_test_getgrent(struct group *, void *);
	
static void usage(void)  __attribute__((__noreturn__));

IMPLEMENT_TEST_DATA(group)
IMPLEMENT_TEST_FILE_SNAPSHOT(group)
IMPLEMENT_1PASS_TEST(group)
IMPLEMENT_2PASS_TEST(group)

static void
clone_group(struct group *dest, struct group const *src)
{
	assert(dest != NULL);
	assert(src != NULL);
	
	char **cp;
	int members_num;
		
	memset(dest, 0, sizeof(struct group));
	
	if (src->gr_name != NULL) {
		dest->gr_name = strdup(src->gr_name);
		assert(dest->gr_name != NULL);
	}
	
	if (src->gr_passwd != NULL) {
		dest->gr_passwd = strdup(src->gr_passwd);
		assert(dest->gr_passwd != NULL);
	}
	dest->gr_gid = src->gr_gid;
	
	if (src->gr_mem != NULL) {
		members_num = 0;
		for (cp = src->gr_mem; *cp; ++cp)
			++members_num;
	
		dest->gr_mem = (char **)malloc(
			(members_num + 1) * (sizeof(char *)));
		assert(dest->gr_mem != NULL);
		memset(dest->gr_mem, 0, (members_num+1) * (sizeof(char *)));
	
		for (cp = src->gr_mem; *cp; ++cp) {
			dest->gr_mem[cp - src->gr_mem] = strdup(*cp);
			assert(dest->gr_mem[cp - src->gr_mem] != NULL);
		}
	}
}

static void 
free_group(struct group *grp)
{
	char **cp;
	
	assert(grp != NULL);
	
	free(grp->gr_name);
	free(grp->gr_passwd);
	
	for (cp = grp->gr_mem; *cp; ++cp)
		free(*cp);
	free(grp->gr_mem);
}

static  int 
compare_group(struct group *grp1, struct group *grp2, void *mdata)
{
	char **c1, **c2;
        
	if (grp1 == grp2)
		return (0);
        
	if ((grp1 == NULL) || (grp2 == NULL))
		goto errfin;
        
	if ((strcmp(grp1->gr_name, grp2->gr_name) != 0) ||
		(strcmp(grp1->gr_passwd, grp2->gr_passwd) != 0) ||
		(grp1->gr_gid != grp2->gr_gid))
			goto errfin;
        
	c1 = grp1->gr_mem;
	c2 = grp2->gr_mem;
	
	if ((grp1->gr_mem == NULL) || (grp2->gr_mem == NULL))
		goto errfin;
	
	for (;*c1 && *c2; ++c1, ++c2)
		if (strcmp(*c1, *c2) != 0)
			goto errfin;
                
	if ((*c1 != '\0') || (*c2 != '\0'))
		goto errfin;
        
	return 0;
	
errfin:
	if ((debug) && (mdata == NULL)) {
		printf("following structures are not equal:\n");
		dump_group(grp1);
		dump_group(grp2);
	}

	return (-1);
}

static void
sdump_group(struct group *grp, char *buffer, size_t buflen)
{
	char **cp;
	int written;
	
	written = snprintf(buffer, buflen, "%s %s %d",
		grp->gr_name, grp->gr_passwd, grp->gr_gid);	
	buffer += written;
	if (written > buflen)
		return;
	buflen -= written;
			
	if (grp->gr_mem != NULL) {
		if (*(grp->gr_mem) != '\0') {
			for (cp = grp->gr_mem; *cp; ++cp) {
				written = snprintf(buffer, buflen, " %s",*cp);
				buffer += written;
				if (written > buflen)
					return;
				buflen -= written;
				
				if (buflen == 0)
					return;				
			}
		} else
			snprintf(buffer, buflen, " nomem");
	} else
		snprintf(buffer, buflen, " (null)");
}

static int
group_read_snapshot_func(struct group *grp, char *line)
{
	StringList *sl;
	char *s, *ps, *ts;
	int i;

	if (debug)
		printf("1 line read from snapshot:\n%s\n", line);
	
	i = 0;
	sl = NULL;
	ps = line;
	memset(grp, 0, sizeof(struct group));
	while ( (s = strsep(&ps, " ")) != NULL) {
		switch (i) {
			case 0:
				grp->gr_name = strdup(s);
				assert(grp->gr_name != NULL);
			break;

			case 1:
				grp->gr_passwd = strdup(s);
				assert(grp->gr_passwd != NULL);
			break;

			case 2:
				grp->gr_gid = (gid_t)strtol(s, &ts, 10);
				if (*ts != '\0') {
					free(grp->gr_name);
					free(grp->gr_passwd);
					return (-1);
				}
			break;

			default:
				if (sl == NULL) {
					if (strcmp(s, "(null)") == 0)
						return (0);
										
					sl = sl_init();
					assert(sl != NULL);
					
					if (strcmp(s, "nomem") != 0) {
						ts = strdup(s);
						assert(ts != NULL);
						sl_add(sl, ts);
					}
				} else {
					ts = strdup(s);
					assert(ts != NULL);
					sl_add(sl, ts);
				}
			break;			
		};
		++i;
	}

	if (i < 3) {
		free(grp->gr_name);
		free(grp->gr_passwd);
		memset(grp, 0, sizeof(struct group));
		return (-1);
	}
	
	sl_add(sl, NULL);
	grp->gr_mem = sl->sl_str;

	/* NOTE: is it a dirty hack or not? */
	free(sl);	
	return (0);
}

static void 
dump_group(struct group *result)
{
	if (result != NULL) {
		char buffer[1024];
		sdump_group(result, buffer, sizeof(buffer));
		printf("%s\n", buffer);
	} else
		printf("(null)\n");
}

static int
group_fill_test_data(struct group_test_data *td)
{
	struct group *grp;
		
	setgroupent(1);
	while ((grp = getgrent()) != NULL) {
		if (group_test_correctness(grp, NULL) == 0)
			TEST_DATA_APPEND(group, td, grp);
		else
			return (-1);
	}
	endgrent();
	
	return (0);
}

static int
group_test_correctness(struct group *grp, void *mdata)
{
	if (debug) {
		printf("testing correctness with the following data:\n");
		dump_group(grp);
	}
	
	if (grp == NULL)
		goto errfin;
	
	if (grp->gr_name == NULL)
		goto errfin;
	
	if (grp->gr_passwd == NULL)
		goto errfin;
	
	if (grp->gr_mem == NULL)
		goto errfin;
	
	if (debug)
		printf("correct\n");
	
	return (0);	
errfin:
	if (debug)
		printf("incorrect\n");
	
	return (-1);
}

/* group_check_ambiguity() is needed here because when doing the getgrent()
 * calls sequence, records from different nsswitch sources can be different, 
 * though having the same pw_name/pw_uid */
static int
group_check_ambiguity(struct group_test_data *td, struct group *pwd)
{
	
	return (TEST_DATA_FIND(group, td, pwd, compare_group,
		NULL) != NULL ? 0 : -1);
}

static int
group_test_getgrnam(struct group *grp_model, void *mdata)
{
	struct group *grp;
		
	if (debug) {
		printf("testing getgrnam() with the following data:\n");
		dump_group(grp_model);
	}

	grp = getgrnam(grp_model->gr_name);
	if (group_test_correctness(grp, NULL) != 0)
		goto errfin;
	
	if ((compare_group(grp, grp_model, NULL) != 0) &&
	    (group_check_ambiguity((struct group_test_data *)mdata, grp) 
	    !=0))
	    goto errfin;
		
	if (debug)
		printf("ok\n");
	return (0);
	
errfin:
	if (debug)
		printf("not ok\n");
	
	return (-1);
}

static int
group_test_getgrgid(struct group *grp_model, void *mdata)
{
	struct group *grp;
		
	if (debug) {
		printf("testing getgrgid() with the following data...\n");
		dump_group(grp_model);
	}	
	
	grp = getgrgid(grp_model->gr_gid);
	if ((group_test_correctness(grp, NULL) != 0) || 
	    ((compare_group(grp, grp_model, NULL) != 0) &&
	    (group_check_ambiguity((struct group_test_data *)mdata, grp)
	    != 0))) {
	    if (debug)
		printf("not ok\n");
	    return (-1);
	} else {
	    if (debug)
		printf("ok\n");
	    return (0);
	}
}

static int 
group_test_getgrent(struct group *grp, void *mdata)
{
	/* Only correctness can be checked when doing 1-pass test for
	 * getgrent(). */
	return (group_test_correctness(grp, NULL));
}

static void
usage(void)
{
	(void)fprintf(stderr,
	    "Usage: %s -nge2 [-d] [-s <file>]\n",
	    getprogname());
	exit(1);
}

int
main(int argc, char **argv)
{
	struct group_test_data td, td_snap, td_2pass;
	char *snapshot_file;
	int rv;
	int c;
	
	if (argc < 2)
		usage();
		
	snapshot_file = NULL;
	while ((c = getopt(argc, argv, "nge2ds:")) != -1)
		switch (c) {
		case 'd':
			debug++;
			break;
		case 'n':
			method = TEST_GETGRNAM;
			break;
		case 'g':
			method = TEST_GETGRGID;
			break;
		case 'e':
			method = TEST_GETGRENT;
			break;
		case '2':
			method = TEST_GETGRENT_2PASS;
			break;
		case 's':
			snapshot_file = strdup(optarg);
			break;
		default:
			usage();
		}
	
	TEST_DATA_INIT(group, &td, clone_group, free_group);
	TEST_DATA_INIT(group, &td_snap, clone_group, free_group);
	if (snapshot_file != NULL) {
		if (access(snapshot_file, W_OK | R_OK) != 0) {		
			if (errno == ENOENT)
				method = TEST_BUILD_SNAPSHOT;
			else {
				if (debug)
					printf("can't access the file %s\n",
				snapshot_file);
			
				rv = -1;
				goto fin;
			}
		} else {
			if (method == TEST_BUILD_SNAPSHOT) {
				rv = 0;
				goto fin;
			}
			
			TEST_SNAPSHOT_FILE_READ(group, snapshot_file,
				&td_snap, group_read_snapshot_func);
		}
	}
		
	rv = group_fill_test_data(&td);
	if (rv == -1)
		return (-1);
	switch (method) {
	case TEST_GETGRNAM:
		if (snapshot_file == NULL)
			rv = DO_1PASS_TEST(group, &td,
				group_test_getgrnam, (void *)&td);
		else
			rv = DO_1PASS_TEST(group, &td_snap, 
				group_test_getgrnam, (void *)&td_snap);
		break;
	case TEST_GETGRGID:
		if (snapshot_file == NULL)
			rv = DO_1PASS_TEST(group, &td,
				group_test_getgrgid, (void *)&td);
		else
			rv = DO_1PASS_TEST(group, &td_snap, 
				group_test_getgrgid, (void *)&td_snap);
		break;
	case TEST_GETGRENT:
		if (snapshot_file == NULL)
			rv = DO_1PASS_TEST(group, &td, group_test_getgrent,
				(void *)&td);
		else
			rv = DO_2PASS_TEST(group, &td, &td_snap,
				compare_group, NULL);
		break;
	case TEST_GETGRENT_2PASS:
			TEST_DATA_INIT(group, &td_2pass, clone_group, free_group);
			rv = group_fill_test_data(&td_2pass);			
			if (rv != -1)
				rv = DO_2PASS_TEST(group, &td, &td_2pass,
					compare_group, NULL);
			TEST_DATA_DESTROY(group, &td_2pass);
		break;
	case TEST_BUILD_SNAPSHOT:
		if (snapshot_file != NULL)
		    rv = TEST_SNAPSHOT_FILE_WRITE(group, snapshot_file, &td, 
			sdump_group);
		break;
	default:
		rv = 0;
		break;
	};

fin:
	TEST_DATA_DESTROY(group, &td_snap);
	TEST_DATA_DESTROY(group, &td);
	free(snapshot_file);	
	return (rv);
}