Commit | Line | Data |
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0d7911ea JH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
f9ba5e22 | 5 | /* Copyright (c) Jeremy Harris 2015 - 2018 */ |
0d7911ea JH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | ||
9 | #include "exim.h" | |
10 | ||
8c5d388a | 11 | #ifdef SUPPORT_I18N |
0d7911ea | 12 | |
9427e879 JH |
13 | #ifdef SUPPORT_I18N_2008 |
14 | # include <idn2.h> | |
15 | #else | |
16 | # include <idna.h> | |
17 | #endif | |
18 | ||
0d7911ea JH |
19 | #include <punycode.h> |
20 | #include <stringprep.h> | |
21 | ||
9427e879 JH |
22 | static uschar * |
23 | string_localpart_alabel_to_utf8_(const uschar * alabel, uschar ** err); | |
24 | ||
25 | /**************************************************/ | |
26 | ||
0d7911ea JH |
27 | BOOL |
28 | string_is_utf8(const uschar * s) | |
29 | { | |
30 | uschar c; | |
1435d4b2 | 31 | if (s) while ((c = *s++)) if (c & 0x80) return TRUE; |
0d7911ea JH |
32 | return FALSE; |
33 | } | |
34 | ||
9427e879 JH |
35 | static BOOL |
36 | string_is_alabel(const uschar * s) | |
37 | { | |
38 | return s[0] == 'x' && s[1] == 'n' && s[2] == '-' && s[3] == '-'; | |
39 | } | |
40 | ||
0d7911ea | 41 | /**************************************************/ |
9427e879 JH |
42 | /* Domain conversions. |
43 | The *err string pointer should be null before the call | |
44 | ||
45 | Return NULL for error, with optional errstr pointer filled in | |
46 | */ | |
0d7911ea JH |
47 | |
48 | uschar * | |
49 | string_domain_utf8_to_alabel(const uschar * utf8, uschar ** err) | |
50 | { | |
9427e879 | 51 | uschar * s1, * s; |
0d7911ea JH |
52 | int rc; |
53 | ||
9427e879 | 54 | #ifdef SUPPORT_I18N_2008 |
496e0df6 JH |
55 | /* Avoid lowercasing plain-ascii domains */ |
56 | if (!string_is_utf8(utf8)) | |
57 | return string_copy(utf8); | |
58 | ||
9427e879 JH |
59 | /* Only lowercase is accepted by the library call. A pity since we lose |
60 | any mixed-case annotation. This does not really matter for a domain. */ | |
61 | { | |
62 | uschar c; | |
63 | for (s1 = s = US utf8; (c = *s1); s1++) if (!(c & 0x80) && isupper(c)) | |
64 | { | |
65 | s = string_copy(utf8); | |
66 | for (s1 = s + (s1 - utf8); (c = *s1); s1++) if (!(c & 0x80) && isupper(c)) | |
67 | *s1 = tolower(c); | |
68 | break; | |
69 | } | |
70 | } | |
7845dbb3 | 71 | if ((rc = idn2_lookup_u8((const uint8_t *) s, &s1, IDN2_NFC_INPUT)) != IDN2_OK) |
9427e879 JH |
72 | { |
73 | if (err) *err = US idn2_strerror(rc); | |
74 | return NULL; | |
75 | } | |
76 | #else | |
0d7911ea | 77 | s = US stringprep_utf8_nfkc_normalize(CCS utf8, -1); |
37bf366e | 78 | if ( (rc = idna_to_ascii_8z(CCS s, CSS &s1, IDNA_ALLOW_UNASSIGNED)) |
0d7911ea JH |
79 | != IDNA_SUCCESS) |
80 | { | |
81 | free(s); | |
82 | if (err) *err = US idna_strerror(rc); | |
83 | return NULL; | |
84 | } | |
85 | free(s); | |
9427e879 | 86 | #endif |
0d7911ea JH |
87 | s = string_copy(s1); |
88 | free(s1); | |
89 | return s; | |
90 | } | |
91 | ||
92 | ||
93 | ||
94 | uschar * | |
95 | string_domain_alabel_to_utf8(const uschar * alabel, uschar ** err) | |
96 | { | |
9427e879 JH |
97 | #ifdef SUPPORT_I18N_2008 |
98 | const uschar * label; | |
99 | int sep = '.'; | |
acec9514 | 100 | gstring * g = NULL; |
9427e879 JH |
101 | |
102 | while (label = string_nextinlist(&alabel, &sep, NULL, 0)) | |
103 | if ( string_is_alabel(label) | |
104 | && !(label = string_localpart_alabel_to_utf8_(label, err)) | |
105 | ) | |
106 | return NULL; | |
107 | else | |
acec9514 JH |
108 | g = string_append_listele(g, '.', label); |
109 | return string_from_gstring(g); | |
9427e879 JH |
110 | |
111 | #else | |
112 | ||
113 | uschar * s1, * s; | |
0d7911ea | 114 | int rc; |
810d16ad | 115 | |
0d7911ea JH |
116 | if ( (rc = idna_to_unicode_8z8z(CCS alabel, CSS &s1, IDNA_USE_STD3_ASCII_RULES)) |
117 | != IDNA_SUCCESS) | |
118 | { | |
119 | if (err) *err = US idna_strerror(rc); | |
120 | return NULL; | |
121 | } | |
122 | s = string_copy(s1); | |
123 | free(s1); | |
124 | return s; | |
9427e879 | 125 | #endif |
0d7911ea JH |
126 | } |
127 | ||
128 | /**************************************************/ | |
129 | /* localpart conversions */ | |
3c8b3577 | 130 | /* the *err string pointer should be null before the call */ |
0d7911ea JH |
131 | |
132 | ||
133 | uschar * | |
134 | string_localpart_utf8_to_alabel(const uschar * utf8, uschar ** err) | |
135 | { | |
136 | size_t ucs4_len; | |
921dfc11 JH |
137 | punycode_uint * p; |
138 | size_t p_len; | |
139 | uschar * res; | |
0d7911ea JH |
140 | int rc; |
141 | ||
921dfc11 JH |
142 | if (!string_is_utf8(utf8)) return string_copy(utf8); |
143 | ||
144 | p = (punycode_uint *) stringprep_utf8_to_ucs4(CCS utf8, -1, &ucs4_len); | |
145 | p_len = ucs4_len*4; /* this multiplier is pure guesswork */ | |
f3ebb786 | 146 | res = store_get(p_len+5, is_tainted(utf8)); |
921dfc11 | 147 | |
0d7911ea JH |
148 | res[0] = 'x'; res[1] = 'n'; res[2] = res[3] = '-'; |
149 | ||
fc362fc5 | 150 | if ((rc = punycode_encode(ucs4_len, p, NULL, &p_len, CS res+4)) != PUNYCODE_SUCCESS) |
0d7911ea | 151 | { |
4e08fd50 | 152 | DEBUG(D_expand) debug_printf("l_u2a: bad '%s'\n", punycode_strerror(rc)); |
0d7911ea JH |
153 | free(p); |
154 | if (err) *err = US punycode_strerror(rc); | |
155 | return NULL; | |
156 | } | |
4e08fd50 | 157 | p_len += 4; |
0d7911ea JH |
158 | free(p); |
159 | res[p_len] = '\0'; | |
160 | return res; | |
161 | } | |
162 | ||
163 | ||
9427e879 JH |
164 | static uschar * |
165 | string_localpart_alabel_to_utf8_(const uschar * alabel, uschar ** err) | |
0d7911ea | 166 | { |
9427e879 | 167 | size_t p_len; |
0d7911ea JH |
168 | punycode_uint * p; |
169 | int rc; | |
9427e879 | 170 | uschar * s, * res; |
0d7911ea | 171 | |
9427e879 JH |
172 | DEBUG(D_expand) debug_printf("l_a2u: '%s'\n", alabel); |
173 | alabel += 4; | |
174 | p_len = Ustrlen(alabel); | |
f3ebb786 | 175 | p = store_get((p_len+1) * sizeof(*p), is_tainted(alabel)); |
0d7911ea | 176 | |
9427e879 | 177 | if ((rc = punycode_decode(p_len, CCS alabel, &p_len, p, NULL)) != PUNYCODE_SUCCESS) |
0d7911ea JH |
178 | { |
179 | if (err) *err = US punycode_strerror(rc); | |
180 | return NULL; | |
181 | } | |
4e08fd50 | 182 | |
aa7751be | 183 | s = US stringprep_ucs4_to_utf8(p, p_len, NULL, &p_len); |
4e08fd50 JH |
184 | res = string_copyn(s, p_len); |
185 | free(s); | |
186 | return res; | |
0d7911ea JH |
187 | } |
188 | ||
189 | ||
9427e879 JH |
190 | uschar * |
191 | string_localpart_alabel_to_utf8(const uschar * alabel, uschar ** err) | |
192 | { | |
193 | if (string_is_alabel(alabel)) | |
194 | return string_localpart_alabel_to_utf8_(alabel, err); | |
195 | ||
196 | if (err) *err = US"bad alabel prefix"; | |
197 | return NULL; | |
198 | } | |
199 | ||
200 | ||
3c8b3577 | 201 | /**************************************************/ |
9427e879 JH |
202 | /* Whole address conversion. |
203 | The *err string pointer should be null before the call. | |
204 | ||
4c04137d | 205 | Return NULL on error, with (optional) errstring pointer filled in |
9427e879 | 206 | */ |
3c8b3577 JH |
207 | |
208 | uschar * | |
209 | string_address_utf8_to_alabel(const uschar * utf8, uschar ** err) | |
210 | { | |
d7978c0f | 211 | uschar * l, * d; |
3c8b3577 | 212 | |
921dfc11 JH |
213 | if (!*utf8) return string_copy(utf8); |
214 | ||
215 | DEBUG(D_expand) debug_printf("addr from utf8 <%s>", utf8); | |
216 | ||
d7978c0f | 217 | for (const uschar * s = utf8; *s; s++) |
3c8b3577 JH |
218 | if (*s == '@') |
219 | { | |
220 | l = string_copyn(utf8, s - utf8); | |
9427e879 JH |
221 | if ( !(l = string_localpart_utf8_to_alabel(l, err)) |
222 | || !(d = string_domain_utf8_to_alabel(++s, err)) | |
921dfc11 JH |
223 | ) |
224 | return NULL; | |
225 | l = string_sprintf("%s@%s", l, d); | |
226 | DEBUG(D_expand) debug_printf(" -> <%s>\n", l); | |
227 | return l; | |
3c8b3577 | 228 | } |
921dfc11 JH |
229 | |
230 | l = string_localpart_utf8_to_alabel(utf8, err); | |
231 | DEBUG(D_expand) debug_printf(" -> <%s>\n", l); | |
232 | return l; | |
3c8b3577 JH |
233 | } |
234 | ||
235 | ||
236 | ||
b04be5e7 JH |
237 | /************************************************* |
238 | * Report the library versions. * | |
239 | *************************************************/ | |
240 | ||
241 | /* See a description in tls-openssl.c for an explanation of why this exists. | |
242 | ||
243 | Arguments: a FILE* to print the results to | |
244 | Returns: nothing | |
245 | */ | |
246 | ||
247 | void | |
248 | utf8_version_report(FILE *f) | |
249 | { | |
9427e879 JH |
250 | #ifdef SUPPORT_I18N_2008 |
251 | fprintf(f, "Library version: IDN2: Compile: %s\n" | |
252 | " Runtime: %s\n", | |
253 | IDN2_VERSION, | |
254 | idn2_check_version(NULL)); | |
255 | fprintf(f, "Library version: Stringprep: Compile: %s\n" | |
256 | " Runtime: %s\n", | |
257 | STRINGPREP_VERSION, | |
258 | stringprep_check_version(NULL)); | |
259 | #else | |
b04be5e7 JH |
260 | fprintf(f, "Library version: IDN: Compile: %s\n" |
261 | " Runtime: %s\n", | |
262 | STRINGPREP_VERSION, | |
263 | stringprep_check_version(NULL)); | |
9427e879 | 264 | #endif |
b04be5e7 JH |
265 | } |
266 | ||
0d7911ea JH |
267 | #endif /* whole file */ |
268 | ||
269 | /* vi: aw ai sw=2 | |
270 | */ | |
271 | /* End of utf8.c */ |