projects / exim.git / blame
| Commit | Line | Data |
|---|---|---|
| 0d7911ea JH |
1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * | |
| 3 | *************************************************/ | |
| 4 | ||
| 5 | /* Copyright (c) Jeremy Harris 2015 */ | |
| 6 | /* See the file NOTICE for conditions of use and distribution. */ | |
| 7 | ||
| 8 | ||
| 9 | #include "exim.h" | |
| 10 | ||
| 11 | #ifdef EXPERIMENTAL_INTERNATIONAL | |
| 12 | ||
| 13 | #include <idna.h> | |
| 14 | #include <punycode.h> | |
| 15 | #include <stringprep.h> | |
| 16 | ||
| 17 | BOOL | |
| 18 | string_is_utf8(const uschar * s) | |
| 19 | { | |
| 20 | uschar c; | |
| 21 | while ((c = *s++)) if (c & 0x80) return TRUE; | |
| 22 | return FALSE; | |
| 23 | } | |
| 24 | ||
| 25 | /**************************************************/ | |
| 26 | /* Domain conversions */ | |
| 27 | ||
| 28 | uschar * | |
| 29 | string_domain_utf8_to_alabel(const uschar * utf8, uschar ** err) | |
| 30 | { | |
| 31 | uschar * s1; | |
| 32 | uschar * s; | |
| 33 | int rc; | |
| 34 | ||
| 35 | s = US stringprep_utf8_nfkc_normalize(CCS utf8, -1); | |
| 36 | if ( (rc = idna_to_ascii_8z(CCS s, CSS &s1, IDNA_USE_STD3_ASCII_RULES)) | |
| 37 | != IDNA_SUCCESS) | |
| 38 | { | |
| 39 | free(s); | |
| 40 | if (err) *err = US idna_strerror(rc); | |
| 41 | return NULL; | |
| 42 | } | |
| 43 | free(s); | |
| 44 | s = string_copy(s1); | |
| 45 | free(s1); | |
| 46 | return s; | |
| 47 | } | |
| 48 | ||
| 49 | ||
| 50 | ||
| 51 | uschar * | |
| 52 | string_domain_alabel_to_utf8(const uschar * alabel, uschar ** err) | |
| 53 | { | |
| 54 | uschar * s1; | |
| 55 | uschar * s; | |
| 56 | int rc; | |
| 57 | if ( (rc = idna_to_unicode_8z8z(CCS alabel, CSS &s1, IDNA_USE_STD3_ASCII_RULES)) | |
| 58 | != IDNA_SUCCESS) | |
| 59 | { | |
| 60 | if (err) *err = US idna_strerror(rc); | |
| 61 | return NULL; | |
| 62 | } | |
| 63 | s = string_copy(s1); | |
| 64 | free(s1); | |
| 65 | return s; | |
| 66 | } | |
| 67 | ||
| 68 | /**************************************************/ | |
| 69 | /* localpart conversions */ | |
| 70 | ||
| 71 | ||
| 72 | uschar * | |
| 73 | string_localpart_utf8_to_alabel(const uschar * utf8, uschar ** err) | |
| 74 | { | |
| 75 | size_t ucs4_len; | |
| 76 | punycode_uint * p = (punycode_uint *) stringprep_utf8_to_ucs4(CCS utf8, -1, &ucs4_len); | |
| 77 | size_t p_len = ucs4_len*4; /* this multiplier is pure guesswork */ | |
| 78 | uschar * res = store_get(p_len+5); | |
| 79 | int rc; | |
| 80 | ||
| 81 | res[0] = 'x'; res[1] = 'n'; res[2] = res[3] = '-'; | |
| 82 | ||
| 83 | if ((rc = punycode_encode(ucs4_len, p, NULL, &p_len, res+4)) != PUNYCODE_SUCCESS) | |
| 84 | { | |
| 85 | free(p); | |
| 86 | if (err) *err = US punycode_strerror(rc); | |
| 87 | return NULL; | |
| 88 | } | |
| 89 | free(p); | |
| 90 | res[p_len] = '\0'; | |
| 91 | return res; | |
| 92 | } | |
| 93 | ||
| 94 | ||
| 95 | uschar * | |
| 96 | string_localpart_alabel_to_utf8(const uschar * alabel, uschar ** err) | |
| 97 | { | |
| 98 | size_t p_len = strlen(alabel); | |
| 99 | punycode_uint * p; | |
| 100 | int rc; | |
| 101 | ||
| 102 | if (alabel[0] != 'x' || alabel[1] != 'n' || alabel[2] != '-' || alabel[3] != '-') | |
| 103 | { | |
| 104 | if (err) *err = US"bad alabel prefix"; | |
| 105 | return NULL; | |
| 106 | } | |
| 107 | p_len -= 4; | |
| 108 | ||
| 109 | p = (punycode_uint *) store_get((p_len+1) * sizeof(*p)); | |
| 110 | ||
| 111 | if ((rc = punycode_decode(p_len, CCS alabel+4, &p_len, p, NULL)) != PUNYCODE_SUCCESS) | |
| 112 | { | |
| 113 | if (err) *err = US punycode_strerror(rc); | |
| 114 | return NULL; | |
| 115 | } | |
| 116 | p[p_len] = 0; | |
| 117 | return US p; | |
| 118 | } | |
| 119 | ||
| 120 | ||
| 121 | #endif /* whole file */ | |
| 122 | ||
| 123 | /* vi: aw ai sw=2 | |
| 124 | */ | |
| 125 | /* End of utf8.c */ |