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2fbf0589 | 1 | /* $Id$ |
2 | * | |
3 | * Provide a copy of kname_parse() from krb4 for when krb4 is no | |
4 | * longer available. | |
5 | * | |
6 | * Copyright (C) 2009 by the Massachusetts Institute of Technology | |
7 | * For copying and distribution information, please see the file | |
8 | * <mit-copyright.h>. | |
9 | */ | |
10 | ||
11 | #include <mit-copyright.h> | |
12 | #include <moira.h> | |
13 | ||
14 | #include <string.h> | |
15 | ||
16 | #ifdef HAVE_KRB4 | |
17 | #include <krb.h> | |
18 | #else | |
19 | #include <mr_krb.h> | |
20 | ||
21 | #define KRBET_KNAME_FMT (39525457L) | |
22 | #define KNAME_FMT (KRBET_KNAME_FMT - ERROR_TABLE_BASE_krb) | |
23 | #endif | |
24 | ||
25 | RCSID("$Header$"); | |
26 | ||
27 | #define NAME 0 /* which field are we in? */ | |
28 | #define INST 1 | |
29 | #define REALM 2 | |
30 | ||
31 | int mr_kname_parse(char *np, char *ip, char *rp, char *fullname) | |
32 | { | |
33 | char buf[MAX_K_NAME_SZ]; | |
34 | char *rnext, *wnext; /* next char to read, write */ | |
35 | register char c; | |
36 | int backslash; | |
37 | int field; | |
38 | ||
39 | backslash = 0; | |
40 | rnext = buf; | |
41 | wnext = np; | |
42 | field = NAME; | |
43 | ||
44 | if (strlen(fullname) > MAX_K_NAME_SZ) | |
45 | return KNAME_FMT; | |
46 | (void) strcpy(buf, fullname); | |
47 | ||
48 | while ((c = *rnext++)) { | |
49 | if (backslash) { | |
50 | *wnext++ = c; | |
51 | backslash = 0; | |
52 | continue; | |
53 | } | |
54 | switch (c) { | |
55 | case '\\': | |
56 | backslash++; | |
57 | break; | |
58 | case '.': | |
59 | switch (field) { | |
60 | case NAME: | |
61 | if (wnext == np) | |
62 | return KNAME_FMT; | |
63 | *wnext = '\0'; | |
64 | field = INST; | |
65 | wnext = ip; | |
66 | break; | |
67 | case INST: /* We now allow period in instance */ | |
68 | case REALM: | |
69 | *wnext++ = c; | |
70 | break; | |
71 | default: | |
72 | return KNAME_FMT; | |
73 | } | |
74 | break; | |
75 | case '@': | |
76 | switch (field) { | |
77 | case NAME: | |
78 | if (wnext == np) | |
79 | return KNAME_FMT; | |
80 | *ip = '\0'; | |
81 | /* fall through */ | |
82 | case INST: | |
83 | *wnext = '\0'; | |
84 | field = REALM; | |
85 | wnext = rp; | |
86 | break; | |
87 | case REALM: | |
88 | return KNAME_FMT; | |
89 | default: | |
90 | return KNAME_FMT; | |
91 | } | |
92 | break; | |
93 | default: | |
94 | *wnext++ = c; | |
95 | } | |
96 | /* | |
97 | * Paranoia: check length each time through to ensure that we | |
98 | * don't overwrite things. | |
99 | */ | |
100 | switch (field) { | |
101 | case NAME: | |
102 | if (wnext - np >= ANAME_SZ) | |
103 | return KNAME_FMT; | |
104 | break; | |
105 | case INST: | |
106 | if (wnext - ip >= INST_SZ) | |
107 | return KNAME_FMT; | |
108 | break; | |
109 | case REALM: | |
110 | if (wnext - rp >= REALM_SZ) | |
111 | return KNAME_FMT; | |
112 | break; | |
113 | default: | |
114 | return KNAME_FMT; | |
115 | } | |
116 | } | |
117 | *wnext = '\0'; | |
118 | return 0; | |
119 | } |