]>
Commit | Line | Data |
---|---|---|
cff2c78c FW |
1 | /* Skip over a (potentially compressed) domain name in wire format. |
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 | #include <arpa/nameser.h> | |
19 | #include <errno.h> | |
20 | #include <shlib-compat.h> | |
21 | ||
22 | /* Advances *PTRPTR to skip over the compressed name it points at. | |
23 | Returns 0 on success, -1 (with errno set) on failure. */ | |
24 | int | |
25 | ___ns_name_skip (const unsigned char **ptrptr, const unsigned char *eom) | |
26 | { | |
27 | const unsigned char *cp; | |
28 | unsigned int n; | |
29 | ||
30 | cp = *ptrptr; | |
31 | while (cp < eom) | |
32 | { | |
33 | n = *cp++; | |
34 | if (n == 0) | |
35 | { | |
36 | /* End of domain name without indirection. */ | |
37 | *ptrptr = cp; | |
38 | return 0; | |
39 | } | |
40 | ||
41 | /* Check for indirection. */ | |
42 | switch (n & NS_CMPRSFLGS) | |
43 | { | |
44 | case 0: /* Normal case, n == len. */ | |
45 | if (eom - cp < n) | |
46 | goto malformed; | |
47 | cp += n; | |
48 | break; | |
49 | case NS_CMPRSFLGS: /* Indirection. */ | |
50 | if (cp == eom) | |
51 | /* No room for second indirection byte. */ | |
52 | goto malformed; | |
53 | *ptrptr = cp + 1; | |
54 | return 0; | |
55 | default: /* Illegal type. */ | |
56 | goto malformed; | |
57 | } | |
58 | } | |
59 | ||
60 | malformed: | |
61 | __set_errno (EMSGSIZE); | |
62 | return -1; | |
63 | } | |
64 | versioned_symbol (libc, ___ns_name_skip, ns_name_skip, GLIBC_2_34); | |
65 | versioned_symbol (libc, ___ns_name_skip, __ns_name_skip, GLIBC_PRIVATE); | |
66 | libc_hidden_ver (___ns_name_skip, __ns_name_skip) | |
67 | ||
68 | #if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_9, GLIBC_2_34) | |
69 | compat_symbol (libresolv, ___ns_name_skip, ns_name_skip, GLIBC_2_9); | |
70 | #endif |