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/*
 * Copyright (c) 1995,1999 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */
 
#if !defined(_LIBC) && !defined(lint)
static const char rcsid[] = "$BINDId: ns_samedomain.c,v 8.9 1999/10/15 21:06:51 vixie Exp $";
#endif
 
#include <sys/types.h>
#include <arpa/nameser.h>
#include <errno.h>
#include <string.h>
 
#include "libc-symbols.h"
 
/*
 * int
 * ns_samedomain(a, b)
 *      Check whether a name belongs to a domain.
 * Inputs:
 *      a - the domain whose ancestory is being verified
 *      b - the potential ancestor we're checking against
 * Return:
 *      boolean - is a at or below b?
 * Notes:
 *      Trailing dots are first removed from name and domain.
 *      Always compare complete subdomains, not only whether the
 *      domain name is the trailing string of the given name.
 *
 *      "host.foobar.top" lies in "foobar.top" and in "top" and in ""
 *      but NOT in "bar.top"
 */
 
int
ns_samedomain(const char *a, const char *b) {
        size_t la, lb;
        int diff, i, escaped;
        const char *cp;
 
        la = strlen(a);
        lb = strlen(b);
 
        /* Ignore a trailing label separator (i.e. an unescaped dot) in 'a'. */
        if (la != 0 && a[la - 1] == '.') {
                escaped = 0;
                /* Note this loop doesn't get executed if la==1. */
                for (i = la - 2; i >= 0; i--)
                        if (a[i] == '\\') {
                                if (escaped)
                                        escaped = 0;
                                else
                                        escaped = 1;
                        } else
                                break;
                if (!escaped)
                        la--;
        }
 
        /* Ignore a trailing label separator (i.e. an unescaped dot) in 'b'. */
        if (lb != 0 && b[lb - 1] == '.') {
                escaped = 0;
                /* note this loop doesn't get executed if lb==1 */
                for (i = lb - 2; i >= 0; i--)
                        if (b[i] == '\\') {
                                if (escaped)
                                        escaped = 0;
                                else
                                        escaped = 1;
                        } else
                                break;
                if (!escaped)
                        lb--;
        }
 
        /* lb == 0 means 'b' is the root domain, so 'a' must be in 'b'. */
        if (lb == 0)
                return (1);
 
        /* 'b' longer than 'a' means 'a' can't be in 'b'. */
        if (lb > la)
                return (0);
 
        /* 'a' and 'b' being equal at this point indicates sameness. */
        if (lb == la)
                return (strncasecmp(a, b, lb) == 0);
 
        /* Ok, we know la > lb. */
 
        diff = la - lb;
 
        /*
         * If 'a' is only 1 character longer than 'b', then it can't be
         * a subdomain of 'b' (because of the need for the '.' label
         * separator).
         */
        if (diff < 2)
                return (0);
 
        /*
         * If the character before the last 'lb' characters of 'b'
         * isn't '.', then it can't be a match (this lets us avoid
         * having "foobar.com" match "bar.com").
         */
        if (a[diff - 1] != '.')
                return (0);
 
        /*
         * We're not sure about that '.', however.  It could be escaped
         * and thus not a really a label separator.
         */
        escaped = 0;
        for (i = diff - 2; i >= 0; i--)
                if (a[i] == '\\')
                        if (escaped)
                                escaped = 0;
                        else
                                escaped = 1;
                else
                        break;
        if (escaped)
                return (0);
 
        /* Now compare aligned trailing substring. */
        cp = a + diff;
        return (strncasecmp(cp, b, lb) == 0);
}
 
/*
 * int
 * ns_subdomain(a, b)
 *      is "a" a subdomain of "b"?
 */
int
ns_subdomain(const char *a, const char *b) {
        return (ns_samename(a, b) != 1 && ns_samedomain(a, b));
}
 
/*
 * int
 * ns_makecanon(src, dst, dstsize)
 *      make a canonical copy of domain name "src"
 * notes:
 *      foo -> foo.
 *      foo. -> foo.
 *      foo.. -> foo.
 *      foo\. -> foo\..
 *      foo\\. -> foo\\.
 */
 
int
ns_makecanon(const char *src, char *dst, size_t dstsize) {
        size_t n = strlen(src);
 
        if (n + sizeof "." > dstsize) {
                __set_errno (EMSGSIZE);
                return (-1);
        }
        strcpy(dst, src);
        while (n > 0 && dst[n - 1] == '.')               /* Ends in "." */
                if (n > 1 && dst[n - 2] == '\\' &&      /* Ends in "\." */
                    (n < 2 || dst[n - 3] != '\\'))      /* But not "\\." */
                        break;
                else
                        dst[--n] = '\0';
        dst[n++] = '.';
        dst[n] = '\0';
        return (0);
}
 
/*
 * int
 * ns_samename(a, b)
 *      determine whether domain name "a" is the same as domain name "b"
 * return:
 *      -1 on error
 *      0 if names differ
 *      1 if names are the same
 */
 
int
ns_samename(const char *a, const char *b) {
        char ta[NS_MAXDNAME], tb[NS_MAXDNAME];
 
        if (ns_makecanon(a, ta, sizeof ta) < 0 ||
            ns_makecanon(b, tb, sizeof tb) < 0)
                return (-1);
        if (strcasecmp(ta, tb) == 0)
                return (1);
        else
                return (0);
}

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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libc/] [sys/] [linux/] [net/] [ns_samedomain.c] - Blame information for rev 816

Line No.	Rev	Author	Line
1	148	jeremybenn	`/*`
2			`* Copyright (c) 1995,1999 by Internet Software Consortium.`
3			`*`
4			`* Permission to use, copy, modify, and distribute this software for any`
5			`* purpose with or without fee is hereby granted, provided that the above`
6			`* copyright notice and this permission notice appear in all copies.`
7			`*`
8			`* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS`
9			`* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES`
10			`* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE`
11			`* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL`
12			`* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR`
13			`* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS`
14			`* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS`
15			`* SOFTWARE.`
16			`*/`
17
18			`#if !defined(_LIBC) && !defined(lint)`
19			`static const char rcsid[] = "$BINDId: ns_samedomain.c,v 8.9 1999/10/15 21:06:51 vixie Exp $";`
20			`#endif`
21
22			`#include <sys/types.h>`
23			`#include <arpa/nameser.h>`
24			`#include <errno.h>`
25			`#include <string.h>`
26
27			`#include "libc-symbols.h"`
28
29			`/*`
30			`* int`
31			`* ns_samedomain(a, b)`
32			`* Check whether a name belongs to a domain.`
33			`* Inputs:`
34			`* a - the domain whose ancestory is being verified`
35			`* b - the potential ancestor we're checking against`
36			`* Return:`
37			`* boolean - is a at or below b?`
38			`* Notes:`
39			`* Trailing dots are first removed from name and domain.`
40			`* Always compare complete subdomains, not only whether the`
41			`* domain name is the trailing string of the given name.`
42			`*`
43			`* "host.foobar.top" lies in "foobar.top" and in "top" and in ""`
44			`* but NOT in "bar.top"`
45			`*/`
46
47			`int`
48			`ns_samedomain(const char a, const char b) {`
49			`size_t la, lb;`
50			`int diff, i, escaped;`
51			`const char *cp;`
52
53			`la = strlen(a);`
54			`lb = strlen(b);`
55
56			`/* Ignore a trailing label separator (i.e. an unescaped dot) in 'a'. */`
57			`if (la != 0 && a[la - 1] == '.') {`
58			`escaped = 0;`
59			`/* Note this loop doesn't get executed if la==1. */`
60			`for (i = la - 2; i >= 0; i--)`
61			`if (a[i] == '\\') {`
62			`if (escaped)`
63			`escaped = 0;`
64			`else`
65			`escaped = 1;`
66			`} else`
67			`break;`
68			`if (!escaped)`
69			`la--;`
70			`}`
71
72			`/* Ignore a trailing label separator (i.e. an unescaped dot) in 'b'. */`
73			`if (lb != 0 && b[lb - 1] == '.') {`
74			`escaped = 0;`
75			`/* note this loop doesn't get executed if lb==1 */`
76			`for (i = lb - 2; i >= 0; i--)`
77			`if (b[i] == '\\') {`
78			`if (escaped)`
79			`escaped = 0;`
80			`else`
81			`escaped = 1;`
82			`} else`
83			`break;`
84			`if (!escaped)`
85			`lb--;`
86			`}`
87
88			`/* lb == 0 means 'b' is the root domain, so 'a' must be in 'b'. */`
89			`if (lb == 0)`
90			`return (1);`
91
92			`/* 'b' longer than 'a' means 'a' can't be in 'b'. */`
93			`if (lb > la)`
94			`return (0);`
95
96			`/* 'a' and 'b' being equal at this point indicates sameness. */`
97			`if (lb == la)`
98			`return (strncasecmp(a, b, lb) == 0);`
99
100			`/* Ok, we know la > lb. */`
101
102			`diff = la - lb;`
103
104			`/*`
105			`* If 'a' is only 1 character longer than 'b', then it can't be`
106			`* a subdomain of 'b' (because of the need for the '.' label`
107			`* separator).`
108			`*/`
109			`if (diff < 2)`
110			`return (0);`
111
112			`/*`
113			`* If the character before the last 'lb' characters of 'b'`
114			`* isn't '.', then it can't be a match (this lets us avoid`
115			`* having "foobar.com" match "bar.com").`
116			`*/`
117			`if (a[diff - 1] != '.')`
118			`return (0);`
119
120			`/*`
121			`* We're not sure about that '.', however. It could be escaped`
122			`* and thus not a really a label separator.`
123			`*/`
124			`escaped = 0;`
125			`for (i = diff - 2; i >= 0; i--)`
126			`if (a[i] == '\\')`
127			`if (escaped)`
128			`escaped = 0;`
129			`else`
130			`escaped = 1;`
131			`else`
132			`break;`
133			`if (escaped)`
134			`return (0);`
135
136			`/* Now compare aligned trailing substring. */`
137			`cp = a + diff;`
138			`return (strncasecmp(cp, b, lb) == 0);`
139			`}`
140
141			`/*`
142			`* int`
143			`* ns_subdomain(a, b)`
144			`* is "a" a subdomain of "b"?`
145			`*/`
146			`int`
147			`ns_subdomain(const char a, const char b) {`
148			`return (ns_samename(a, b) != 1 && ns_samedomain(a, b));`
149			`}`
150
151			`/*`
152			`* int`
153			`* ns_makecanon(src, dst, dstsize)`
154			`* make a canonical copy of domain name "src"`
155			`* notes:`
156			`* foo -> foo.`
157			`* foo. -> foo.`
158			`* foo.. -> foo.`
159			`* foo\. -> foo\..`
160			`* foo\\. -> foo\\.`
161			`*/`
162
163			`int`
164			`ns_makecanon(const char src, char dst, size_t dstsize) {`
165			`size_t n = strlen(src);`
166
167			`if (n + sizeof "." > dstsize) {`
168			`__set_errno (EMSGSIZE);`
169			`return (-1);`
170			`}`
171			`strcpy(dst, src);`
172			`while (n > 0 && dst[n - 1] == '.') /* Ends in "." */`
173			`if (n > 1 && dst[n - 2] == '\\' && /* Ends in "\." */`
174			`(n < 2 \|\| dst[n - 3] != '\\')) /* But not "\\." */`
175			`break;`
176			`else`
177			`dst[--n] = '\0';`
178			`dst[n++] = '.';`
179			`dst[n] = '\0';`
180			`return (0);`
181			`}`
182
183			`/*`
184			`* int`
185			`* ns_samename(a, b)`
186			`* determine whether domain name "a" is the same as domain name "b"`
187			`* return:`
188			`* -1 on error`
189			`* 0 if names differ`
190			`* 1 if names are the same`
191			`*/`
192
193			`int`
194			`ns_samename(const char a, const char b) {`
195			`char ta[NS_MAXDNAME], tb[NS_MAXDNAME];`
196
197			`if (ns_makecanon(a, ta, sizeof ta) < 0 \|\|`
198			`ns_makecanon(b, tb, sizeof tb) < 0)`
199			`return (-1);`
200			`if (strcasecmp(ta, tb) == 0)`
201			`return (1);`
202			`else`
203			`return (0);`
204			`}`