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0756eb3c PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
3386088d | 5 | /* Copyright (c) University of Cambridge 1995 - 2015 */ |
0756eb3c PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | /* The idea for this code came from Matthew Byng-Maddick, but his original has | |
0f2cbd1b MH |
9 | been heavily reworked a lot for Exim 4 (and it now uses stat() (more precisely: |
10 | lstat()) rather than a directory scan). */ | |
0756eb3c PH |
11 | |
12 | ||
13 | #include "../exim.h" | |
14 | #include "lf_functions.h" | |
0756eb3c PH |
15 | |
16 | ||
17 | ||
18 | /************************************************* | |
19 | * Open entry point * | |
20 | *************************************************/ | |
21 | ||
22 | /* See local README for interface description. We open the directory to test | |
23 | whether it exists and whether it is searchable. However, we don't need to keep | |
0f2cbd1b | 24 | it open, because the "search" can be done by a call to lstat() rather than |
0756eb3c PH |
25 | actually scanning through the list of files. */ |
26 | ||
e6d225ae | 27 | static void * |
0756eb3c PH |
28 | dsearch_open(uschar *dirname, uschar **errmsg) |
29 | { | |
30 | DIR *dp = opendir(CS dirname); | |
31 | if (dp == NULL) | |
32 | { | |
33 | int save_errno = errno; | |
34 | *errmsg = string_open_failed(errno, "%s for directory search", dirname); | |
35 | errno = save_errno; | |
36 | return NULL; | |
37 | } | |
38 | closedir(dp); | |
39 | return (void *)(-1); | |
40 | } | |
41 | ||
42 | ||
43 | /************************************************* | |
44 | * Check entry point * | |
45 | *************************************************/ | |
46 | ||
47 | /* The handle will always be (void *)(-1), but don't try casting it to an | |
48 | integer as this gives warnings on 64-bit systems. */ | |
49 | ||
50 | BOOL | |
e6d225ae | 51 | static dsearch_check(void *handle, uschar *filename, int modemask, uid_t *owners, |
0756eb3c PH |
52 | gid_t *owngroups, uschar **errmsg) |
53 | { | |
54 | handle = handle; | |
55 | return lf_check_file(-1, filename, S_IFDIR, modemask, owners, owngroups, | |
56 | "dsearch", errmsg) == 0; | |
57 | } | |
58 | ||
59 | ||
60 | /************************************************* | |
61 | * Find entry point * | |
62 | *************************************************/ | |
63 | ||
0f2cbd1b | 64 | /* See local README for interface description. We use lstat() instead of |
0756eb3c PH |
65 | scanning the directory, as it is hopefully faster to let the OS do the scanning |
66 | for us. */ | |
67 | ||
68 | int | |
55414b25 | 69 | static dsearch_find(void *handle, uschar *dirname, const uschar *keystring, int length, |
14b3c5bc | 70 | uschar **result, uschar **errmsg, uint *do_cache) |
0756eb3c PH |
71 | { |
72 | struct stat statbuf; | |
73 | int save_errno; | |
74 | uschar filename[PATH_MAX]; | |
75 | ||
76 | handle = handle; /* Keep picky compilers happy */ | |
77 | length = length; | |
78 | do_cache = do_cache; | |
79 | ||
80 | if (Ustrchr(keystring, '/') != 0) | |
81 | { | |
82 | *errmsg = string_sprintf("key for dsearch lookup contains a slash: %s", | |
83 | keystring); | |
84 | return DEFER; | |
85 | } | |
86 | ||
87 | if (!string_format(filename, sizeof(filename), "%s/%s", dirname, keystring)) | |
88 | { | |
89 | *errmsg = US"path name too long"; | |
90 | return DEFER; | |
91 | } | |
92 | ||
0f2cbd1b | 93 | if (Ulstat(filename, &statbuf) >= 0) |
0756eb3c PH |
94 | { |
95 | *result = string_copy(keystring); | |
96 | return OK; | |
97 | } | |
98 | ||
99 | if (errno == ENOENT) return FAIL; | |
100 | ||
101 | save_errno = errno; | |
0f2cbd1b | 102 | *errmsg = string_sprintf("%s: lstat failed", filename); |
0756eb3c PH |
103 | errno = save_errno; |
104 | return DEFER; | |
105 | } | |
106 | ||
107 | ||
108 | /************************************************* | |
109 | * Close entry point * | |
110 | *************************************************/ | |
111 | ||
112 | /* See local README for interface description */ | |
113 | ||
114 | void | |
e6d225ae | 115 | static dsearch_close(void *handle) |
0756eb3c PH |
116 | { |
117 | handle = handle; /* Avoid compiler warning */ | |
118 | } | |
119 | ||
6545de78 PP |
120 | |
121 | /************************************************* | |
122 | * Version reporting entry point * | |
123 | *************************************************/ | |
124 | ||
125 | /* See local README for interface description. */ | |
126 | ||
127 | #include "../version.h" | |
128 | ||
129 | void | |
130 | dsearch_version_report(FILE *f) | |
131 | { | |
132 | #ifdef DYNLOOKUP | |
133 | fprintf(f, "Library version: dsearch: Exim version %s\n", EXIM_VERSION_STR); | |
134 | #endif | |
135 | } | |
136 | ||
137 | ||
e6d225ae DW |
138 | static lookup_info _lookup_info = { |
139 | US"dsearch", /* lookup name */ | |
140 | lookup_absfile, /* uses absolute file name */ | |
141 | dsearch_open, /* open function */ | |
142 | dsearch_check, /* check function */ | |
143 | dsearch_find, /* find function */ | |
144 | dsearch_close, /* close function */ | |
145 | NULL, /* no tidy function */ | |
6545de78 PP |
146 | NULL, /* no quoting function */ |
147 | dsearch_version_report /* version reporting */ | |
e6d225ae DW |
148 | }; |
149 | ||
150 | #ifdef DYNLOOKUP | |
151 | #define dsearch_lookup_module_info _lookup_module_info | |
152 | #endif | |
153 | ||
154 | static lookup_info *_lookup_list[] = { &_lookup_info }; | |
155 | lookup_module_info dsearch_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 }; | |
156 | ||
0756eb3c | 157 | /* End of lookups/dsearch.c */ |