xref: /illumos-gate/usr/src/lib/libresolv2/common/irs/util.c (revision 67dbe2be0c0f1e2eb428b89088bb5667e8f0b9f6)
1 /*
2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3  * Copyright (c) 1996,1999 by Internet Software Consortium.
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$Id: util.c,v 1.3 2005/04/27 04:56:34 sra Exp $";
20 #endif
21 
22 #include "port_before.h"
23 
24 #include <sys/types.h>
25 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <arpa/nameser.h>
28 #include <resolv.h>
29 
30 #include <ctype.h>
31 #include <errno.h>
32 #include <stdio.h>
33 #include <string.h>
34 #include <stdlib.h>
35 
36 #include <irs.h>
37 
38 #include "port_after.h"
39 
40 #include "irs_p.h"
41 
42 #ifdef SPRINTF_CHAR
43 # define SPRINTF(x) strlen(sprintf/**/x)
44 #else
45 # define SPRINTF(x) sprintf x
46 #endif
47 
48 void
49 map_v4v6_address(const char *src, char *dst) {
50 	u_char *p = (u_char *)dst;
51 	char tmp[NS_INADDRSZ];
52 	int i;
53 
54 	/* Stash a temporary copy so our caller can update in place. */
55 	memcpy(tmp, src, NS_INADDRSZ);
56 	/* Mark this ipv6 addr as a mapped ipv4. */
57 	for (i = 0; i < 10; i++)
58 		*p++ = 0x00;
59 	*p++ = 0xff;
60 	*p++ = 0xff;
61 	/* Retrieve the saved copy and we're done. */
62 	memcpy((void*)p, tmp, NS_INADDRSZ);
63 }
64 
65 int
66 make_group_list(struct irs_gr *this, const char *name,
67 	gid_t basegid, gid_t *groups, int *ngroups)
68 {
69 	struct group *grp;
70 	int i, ng;
71 	int ret, maxgroups;
72 
73 	ret = -1;
74 	ng = 0;
75 	maxgroups = *ngroups;
76 	/*
77 	 * When installing primary group, duplicate it;
78 	 * the first element of groups is the effective gid
79 	 * and will be overwritten when a setgid file is executed.
80 	 */
81 	if (ng >= maxgroups)
82 		goto done;
83 	groups[ng++] = basegid;
84 	if (ng >= maxgroups)
85 		goto done;
86 	groups[ng++] = basegid;
87 	/*
88 	 * Scan the group file to find additional groups.
89 	 */
90 	(*this->rewind)(this);
91 	while ((grp = (*this->next)(this)) != NULL) {
92 		if ((gid_t)grp->gr_gid == basegid)
93 			continue;
94 		for (i = 0; grp->gr_mem[i]; i++) {
95 			if (!strcmp(grp->gr_mem[i], name)) {
96 				if (ng >= maxgroups)
97 					goto done;
98 				groups[ng++] = grp->gr_gid;
99 				break;
100 			}
101 		}
102 	}
103 	ret = 0;
104  done:
105 	*ngroups = ng;
106 	return (ret);
107 }
108 
109 /*! \file */
110