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revnetgroup - generate extra netgroup maps for YP
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lukem
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Oct 6, 1997
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# $OpenBSD: Makefile,v 1.1 1997/04/15 22:06:10 maja Exp $ | |||
# $FreeBSD: Makefile,v 1.3 1997/02/22 14:22:00 peter Exp $ | |||
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PROG= revnetgroup | |||
SRCS= revnetgroup.c hash.c parse_netgroup.c | |||
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MAN= revnetgroup.8 | |||
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.include <bsd.prog.mk> |
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/* $OpenBSD: hash.c,v 1.1 1997/04/15 22:06:11 maja Exp $ */ | |||
/* | |||
* Copyright (c) 1995 | |||
* Bill Paul <wpaul@ctr.columbia.edu>. 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. | |||
* 3. All advertising materials mentioning features or use of this software | |||
* must display the following acknowledgement: | |||
* This product includes software developed by Bill Paul. | |||
* 4. Neither the name of the author nor the names of any co-contributors | |||
* may be used to endorse or promote products derived from this software | |||
* without specific prior written permission. | |||
* | |||
* THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul 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. | |||
* | |||
* $FreeBSD: hash.c,v 1.4 1997/02/22 14:22:01 peter Exp $ | |||
*/ | |||
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#include <stdio.h> | |||
#include <stdlib.h> | |||
#include <string.h> | |||
#include <sys/types.h> | |||
#include "hash.h" | |||
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#ifndef lint | |||
static const char rcsid[] = "$OpenBSD: hash.c,v 1.1 1997/04/15 22:06:11 maja Exp $"; | |||
#endif | |||
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/* | |||
* This hash function is stolen directly from the | |||
* Berkeley DB package. It already exists inside libc, but | |||
* it's declared static which prevents us from calling it | |||
* from here. | |||
*/ | |||
/* | |||
* OZ's original sdbm hash | |||
*/ | |||
u_int32_t | |||
hash(keyarg, len) | |||
const void *keyarg; | |||
register size_t len; | |||
{ | |||
register const u_char *key; | |||
register size_t loop; | |||
register u_int32_t h; | |||
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#define HASHC h = *key++ + 65599 * h | |||
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h = 0; | |||
key = keyarg; | |||
if (len > 0) { | |||
loop = (len + 8 - 1) >> 3; | |||
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switch (len & (8 - 1)) { | |||
case 0: | |||
do { | |||
HASHC; | |||
/* FALLTHROUGH */ | |||
case 7: | |||
HASHC; | |||
/* FALLTHROUGH */ | |||
case 6: | |||
HASHC; | |||
/* FALLTHROUGH */ | |||
case 5: | |||
HASHC; | |||
/* FALLTHROUGH */ | |||
case 4: | |||
HASHC; | |||
/* FALLTHROUGH */ | |||
case 3: | |||
HASHC; | |||
/* FALLTHROUGH */ | |||
case 2: | |||
HASHC; | |||
/* FALLTHROUGH */ | |||
case 1: | |||
HASHC; | |||
} while (--loop); | |||
} | |||
} | |||
return (h); | |||
} | |||
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/* | |||
* Generate a hash value for a given key (character string). | |||
* We mask off all but the lower 8 bits since our table array | |||
* can only hold 256 elements. | |||
*/ | |||
u_int32_t hashkey(key) | |||
char *key; | |||
{ | |||
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if (key == NULL) | |||
return (-1); | |||
return(hash((void *)key, strlen(key)) & HASH_MASK); | |||
} | |||
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/* Find an entry in the hash table (may be hanging off a linked list). */ | |||
char *lookup(table, key) | |||
struct group_entry *table[]; | |||
char *key; | |||
{ | |||
struct group_entry *cur; | |||
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cur = table[hashkey(key)]; | |||
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while (cur) { | |||
if (!strcmp(cur->key, key)) | |||
return(cur->data); | |||
cur = cur->next; | |||
} | |||
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return(NULL); | |||
} | |||
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/* | |||
* Store an entry in the main netgroup hash table. Here's how this | |||
* works: the table can only be so big when we initialize it (TABLESIZE) | |||
* but the number of netgroups in the /etc/netgroup file could easily be | |||
* much larger than the table. Since our hash values are adjusted to | |||
* never be greater than TABLESIZE too, this means it won't be long before | |||
* we find ourselves with two keys that hash to the same value. | |||
* | |||
* One way to deal with this is to malloc(2) a second table and start | |||
* doing indirection, but this is a pain in the butt and it's not worth | |||
* going to all that trouble for a dinky little program like this. Instead, | |||
* we turn each table entry into a linked list and simply link keys | |||
* with the same hash value together at the same index location within | |||
* the table. | |||
* | |||
* That's a lot of comment for such a small piece of code, isn't it. | |||
*/ | |||
void store (table, key, data) | |||
struct group_entry *table[]; | |||
char *key, *data; | |||
{ | |||
struct group_entry *new; | |||
u_int32_t i; | |||
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i = hashkey(key); | |||
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new = (struct group_entry *)malloc(sizeof(struct group_entry)); | |||
new->key = strdup(key); | |||
new->data = strdup(data); | |||
new->next = table[i]; | |||
table[i] = new; | |||
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return; | |||
} | |||
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/* | |||
* Store a group member entry and/or update its grouplist. This is | |||
* a bit more complicated than the previous function since we have to | |||
* maintain not only the hash table of group members, each group member | |||
* structure also has a linked list of groups hung off it. If handed | |||
* a member name that we haven't encountered before, we have to do | |||
* two things: add that member to the table (possibly hanging them | |||
* off the end of a linked list, as above), and add a group name to | |||
* the member's grouplist list. If we're handed a name that already has | |||
* an entry in the table, then we just have to do one thing, which is | |||
* to update its grouplist. | |||
*/ | |||
void mstore (table, key, data, domain) | |||
struct member_entry *table[]; | |||
char *key, *data, *domain; | |||
{ | |||
struct member_entry *cur, *new; | |||
struct grouplist *tmp,*p; | |||
u_int32_t i; | |||
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i = hashkey(key); | |||
cur = table[i]; | |||
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tmp = (struct grouplist *)malloc(sizeof(struct grouplist)); | |||
tmp->groupname = strdup(data); | |||
tmp->next = NULL; | |||
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/* Check if all we have to do is insert a new groupname. */ | |||
while (cur) { | |||
if (!strcmp(cur->key, key) && !strcmp(cur->domain,domain)) { | |||
p = cur->groups; | |||
while(p) { | |||
if (!strcmp(p->groupname,data)) | |||
return; | |||
p = p->next; | |||
} | |||
tmp->next = cur->groups; | |||
cur->groups = tmp; | |||
return; | |||
} | |||
cur = cur->next; | |||
} | |||
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/* Didn't find a match -- add the whole mess to the table. */ | |||
new = (struct member_entry *)malloc(sizeof(struct member_entry)); | |||
new->key = strdup(key); | |||
new->domain = strdup(domain); | |||
new->groups = tmp; | |||
new->next = table[i]; | |||
table[i] = new; | |||
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return; | |||
} |
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/* $OpenBSD: hash.h,v 1.1 1997/04/15 22:06:12 maja Exp $ */ | |||
/* | |||
* Copyright (c) 1995 | |||
* Bill Paul <wpaul@ctr.columbia.edu>. 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. | |||
* 3. All advertising materials mentioning features or use of this software | |||
* must display the following acknowledgement: | |||
* This product includes software developed by Bill Paul. | |||
* 4. Neither the name of the author nor the names of any co-contributors | |||
* may be used to endorse or promote products derived from this software | |||
* without specific prior written permission. | |||
* | |||
* THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul 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. | |||
* | |||
* $FreeBSD: hash.h,v 1.5 1997/02/22 14:22:02 peter Exp $ | |||
*/ | |||
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/* Groupname entry hung off a member_entry node. */ | |||
struct grouplist { | |||
char *groupname; | |||
struct grouplist *next; | |||
}; | |||
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/* Entry in the cooked member list hash table. */ | |||
struct member_entry { | |||
char *key; | |||
char *domain; | |||
struct grouplist *groups; | |||
struct member_entry *next; | |||
}; | |||
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/* Entry in the raw netgroup table. */ | |||
struct group_entry { | |||
char *key; | |||
char *data; | |||
struct group_entry *next; | |||
}; | |||
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/* Table size (chosen arbitrarily). Not too big, not too small. */ | |||
#define TABLESIZE 256 | |||
#define HASH_MASK 0x000000FF | |||
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#define LINSIZ 1024 * 10 | |||
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extern void store __P(( struct group_entry ** , char *, char * )); | |||
extern void mstore __P(( struct member_entry ** , char *, char *, char * )); | |||
extern char *lookup __P(( struct group_entry **, char * )); | |||
extern void __endnetgrent __P(( void )); | |||
extern void __setnetgrent __P(( char * )); | |||
extern int __getnetgrent __P(( char **, char **, char ** )); |
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