Mercurial > dovecot > core-2.2

annotate src/lib-compression/compression.c @ 22628:8623737c0129

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director: Track connections' last ping time
author Timo Sirainen <timo.sirainen@dovecot.fi>
date Thu, 26 Oct 2017 14:07:56 +0300
parents 2e2563132d5f
children cb108f786fb4
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rev   line source
21390
2e2563132d5f Updated copyright notices to include the year 2017.
Stephan Bosch <stephan.bosch@dovecot.fi>
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1 /* Copyright (c) 2010-2017 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "istream.h"
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5 #include "istream-zlib.h"
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6 #include "ostream-zlib.h"
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7 #include "iostream-lz4.h"
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8 #include "compression.h"
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9
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10 #ifndef HAVE_ZLIB
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11 # define i_stream_create_gz NULL
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12 # define o_stream_create_gz NULL
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13 # define i_stream_create_deflate NULL
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14 # define o_stream_create_deflate NULL
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15 #endif
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16 #ifndef HAVE_BZLIB
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17 # define i_stream_create_bz2 NULL
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18 # define o_stream_create_bz2 NULL
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19 #endif
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20 #ifndef HAVE_LZMA
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21 # define i_stream_create_lzma NULL
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22 # define o_stream_create_lzma NULL
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23 #endif
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24 #ifndef HAVE_LZ4
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25 # define i_stream_create_lz4 NULL
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26 # define o_stream_create_lz4 NULL
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27 #endif
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28
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29 static bool is_compressed_zlib(struct istream *input)
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30 {
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31 const unsigned char *data;
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32 size_t size;
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33
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34 /* Peek in to the stream and see if it looks like it's compressed
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35 (based on its header). This also means that users can try to exploit
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36 security holes in the uncompression library by APPENDing a specially
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37 crafted mail. So let's hope zlib is free of holes. */
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38 if (i_stream_read_data(input, &data, &size, 1) <= 0)
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39 return FALSE;
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40 i_assert(size >= 2);
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41
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42 return data[0] == 31 && data[1] == 139;
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43 }
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44
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45 static bool is_compressed_bzlib(struct istream *input)
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46 {
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47 const unsigned char *data;
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48 size_t size;
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49
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50 if (i_stream_read_data(input, &data, &size, 4+6 - 1) <= 0)
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51 return FALSE;
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52 if (data[0] != 'B' || data[1] != 'Z')
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53 return FALSE;
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54 if (data[2] != 'h' && data[2] != '0')
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55 return FALSE;
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56 if (data[3] < '1' || data[3] > '9')
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57 return FALSE;
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58 return memcmp(data + 4, "\x31\x41\x59\x26\x53\x59", 6) == 0;
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59 }
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60
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61 static bool is_compressed_xz(struct istream *input)
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62 {
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63 const unsigned char *data;
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64 size_t size;
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65
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66 if (i_stream_read_data(input, &data, &size, 6 - 1) <= 0)
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67 return FALSE;
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68 return memcmp(data, "\xfd\x37\x7a\x58\x5a", 6) == 0;
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69 }
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70
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71 static bool is_compressed_lz4(struct istream *input)
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72 {
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73 const unsigned char *data;
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74 size_t size;
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75
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76 if (i_stream_read_data(input, &data, &size,
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77 IOSTREAM_LZ4_MAGIC_LEN - 1) <= 0)
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78 return FALSE;
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79 /* there is no standard LZ4 header, so we've created our own */
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80 return memcmp(data, IOSTREAM_LZ4_MAGIC, IOSTREAM_LZ4_MAGIC_LEN) == 0;
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81 }
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82
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83 const struct compression_handler *compression_lookup_handler(const char *name)
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84 {
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85 unsigned int i;
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86
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87 for (i = 0; compression_handlers[i].name != NULL; i++) {
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88 if (strcmp(name, compression_handlers[i].name) == 0)
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89 return &compression_handlers[i];
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90 }
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91 return NULL;
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92 }
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93
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94 const struct compression_handler *
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95 compression_detect_handler(struct istream *input)
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96 {
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97 unsigned int i;
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98
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99 for (i = 0; compression_handlers[i].name != NULL; i++) {
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100 if (compression_handlers[i].is_compressed != NULL &&
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101 compression_handlers[i].is_compressed(input))
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102 return &compression_handlers[i];
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103 }
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104 return NULL;
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105 }
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106
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107 const struct compression_handler *
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108 compression_lookup_handler_from_ext(const char *path)
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109 {
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110 unsigned int i;
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111 size_t len, path_len = strlen(path);
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112
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113 for (i = 0; compression_handlers[i].name != NULL; i++) {
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114 if (compression_handlers[i].ext == NULL)
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115 continue;
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116
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117 len = strlen(compression_handlers[i].ext);
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118 if (path_len > len &&
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119 strcmp(path + path_len - len, compression_handlers[i].ext) == 0)
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120 return &compression_handlers[i];
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121 }
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122 return NULL;
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123 }
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124
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125 const struct compression_handler compression_handlers[] = {
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126 { "gz", ".gz", is_compressed_zlib,
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127 i_stream_create_gz, o_stream_create_gz },
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128 { "bz2", ".bz2", is_compressed_bzlib,
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129 i_stream_create_bz2, o_stream_create_bz2 },
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130 { "deflate", NULL, NULL,
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131 i_stream_create_deflate, o_stream_create_deflate },
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132 { "xz", ".xz", is_compressed_xz,
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133 i_stream_create_lzma, o_stream_create_lzma },
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134 { "lz4", ".lz4", is_compressed_lz4,
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135 i_stream_create_lz4, o_stream_create_lz4 },
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378ba560ea9f Moved zlib/bzlib code to lib-compression library.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
136 { NULL, NULL, NULL, NULL, NULL }
378ba560ea9f Moved zlib/bzlib code to lib-compression library.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
137 };