Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/lib-index/mbox/mbox-rewrite.c @ 362:aa449d013563 HEAD
When updating any of the fields, keep them in the original location in
header instead of moving to bottom.
author | Timo Sirainen <tss@iki.fi> |
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date | Sun, 06 Oct 2002 05:54:35 +0300 |
parents | f5e59d65d124 |
children | 567e932cdc66 |
rev | line source |
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1 /* Copyright (C) 2002 Timo Sirainen */ |
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2 |
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3 #include "lib.h" |
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4 #include "iobuffer.h" |
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5 #include "temp-string.h" |
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6 #include "write-full.h" |
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7 #include "mbox-index.h" |
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8 #include "mbox-lock.h" |
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9 #include "mail-index-util.h" |
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10 #include "mail-custom-flags.h" |
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11 |
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12 #include <stdio.h> |
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13 #include <stdlib.h> |
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14 #include <unistd.h> |
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15 #include <fcntl.h> |
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16 |
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17 typedef struct { |
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18 IOBuffer *outbuf; |
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19 int failed; |
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20 |
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21 unsigned int seq; |
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22 unsigned int msg_flags; |
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23 const char **custom_flags; |
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24 |
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25 unsigned int uid_validity; |
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26 unsigned int uid_last; |
362
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27 |
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28 unsigned int ximapbase_found:1; |
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29 unsigned int xkeywords_found:1; |
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30 unsigned int status_found:1; |
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31 unsigned int xstatus_found:1; |
160
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32 } MboxRewriteContext; |
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33 |
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34 /* Remove dirty flag from all messages */ |
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35 static void reset_dirty_flags(MailIndex *index) |
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36 { |
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37 MailIndexRecord *rec; |
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38 |
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39 rec = index->lookup(index, 1); |
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40 while (rec != NULL) { |
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41 rec->index_flags &= ~INDEX_MAIL_FLAG_DIRTY; |
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42 rec = index->next(index, rec); |
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43 } |
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44 |
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45 index->header->flags &= ~(MAIL_INDEX_FLAG_DIRTY_MESSAGES | |
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46 MAIL_INDEX_FLAG_DIRTY_CUSTOMFLAGS); |
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47 } |
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48 |
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49 static int mbox_write(MailIndex *index, IOBuffer *inbuf, IOBuffer *outbuf, |
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50 uoff_t end_offset) |
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51 { |
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52 i_assert(inbuf->offset <= end_offset); |
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53 |
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54 if (io_buffer_send_iobuffer(outbuf, inbuf, |
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55 end_offset - inbuf->offset) < 0) |
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56 return FALSE; |
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57 |
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58 if (inbuf->offset < end_offset) { |
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59 /* fsck should have noticed it.. */ |
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60 index_set_error(index, "Error rewriting mbox file %s: " |
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61 "Unexpected end of file", index->mbox_path); |
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62 return FALSE; |
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63 } |
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64 |
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65 return TRUE; |
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66 } |
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67 |
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68 static int mbox_write_ximapbase(MboxRewriteContext *ctx) |
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69 { |
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70 const char *str; |
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71 int i; |
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72 |
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73 str = t_strdup_printf("X-IMAPbase: %u %u", |
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74 ctx->uid_validity, ctx->uid_last); |
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75 if (io_buffer_send(ctx->outbuf, str, strlen(str)) < 0) |
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76 return FALSE; |
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77 |
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78 for (i = 0; i < MAIL_CUSTOM_FLAGS_COUNT; i++) { |
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79 if (ctx->custom_flags[i] != NULL) { |
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80 if (io_buffer_send(ctx->outbuf, " ", 1) < 0) |
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81 return FALSE; |
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82 |
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83 if (io_buffer_send(ctx->outbuf, ctx->custom_flags[i], |
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84 strlen(ctx->custom_flags[i])) < 0) |
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85 return FALSE; |
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86 } |
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87 } |
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88 |
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89 if (io_buffer_send(ctx->outbuf, "\n", 1) < 0) |
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90 return FALSE; |
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91 |
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92 return TRUE; |
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93 } |
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94 |
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95 static int mbox_write_xkeywords(MboxRewriteContext *ctx, const char *x_keywords) |
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96 { |
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97 unsigned int field; |
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98 int i; |
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99 |
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100 if ((ctx->msg_flags & MAIL_CUSTOM_FLAGS_MASK) == 0 && |
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101 x_keywords == NULL) |
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102 return TRUE; |
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103 |
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104 if (io_buffer_send(ctx->outbuf, "X-Keywords:", 11) < 0) |
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105 return FALSE; |
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106 |
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107 field = 1 << MAIL_CUSTOM_FLAG_1_BIT; |
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108 for (i = 0; i < MAIL_CUSTOM_FLAGS_COUNT; i++, field <<= 1) { |
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109 if ((ctx->msg_flags & field) && ctx->custom_flags[i] != NULL) { |
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110 if (io_buffer_send(ctx->outbuf, " ", 1) < 0) |
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111 return FALSE; |
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112 |
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113 if (io_buffer_send(ctx->outbuf, ctx->custom_flags[i], |
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114 strlen(ctx->custom_flags[i])) < 0) |
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115 return FALSE; |
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116 } |
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117 } |
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118 |
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119 if (x_keywords != NULL) { |
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120 /* X-Keywords that aren't custom flags */ |
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121 if (io_buffer_send(ctx->outbuf, " ", 1) < 0) |
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122 return FALSE; |
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When updating any of the fields, keep them in the original location in
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123 |
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124 if (io_buffer_send(ctx->outbuf, x_keywords, |
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When updating any of the fields, keep them in the original location in
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|
125 strlen(x_keywords)) < 0) |
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126 return FALSE; |
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127 } |
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128 |
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129 if (io_buffer_send(ctx->outbuf, "\n", 1) < 0) |
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130 return FALSE; |
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131 |
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132 return TRUE; |
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133 } |
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134 |
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135 static int mbox_write_status(MboxRewriteContext *ctx, const char *status) |
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136 { |
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137 const char *str; |
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138 |
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139 str = (ctx->msg_flags & MAIL_SEEN) ? "Status: RO" : "Status: O"; |
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140 if (status != NULL) |
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141 str = t_strconcat(str, status, NULL); |
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142 |
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143 if (io_buffer_send(ctx->outbuf, str, strlen(str)) < 0) |
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144 return FALSE; |
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145 if (io_buffer_send(ctx->outbuf, "\n", 1) < 0) |
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146 return FALSE; |
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147 |
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148 return TRUE; |
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149 } |
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150 |
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151 static int mbox_write_xstatus(MboxRewriteContext *ctx, const char *x_status) |
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152 { |
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153 const char *str; |
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154 |
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155 /* X-Status field */ |
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156 if ((ctx->msg_flags & (MAIL_SYSTEM_FLAGS_MASK^MAIL_SEEN)) == 0 && |
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157 x_status == NULL) |
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158 return TRUE; |
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159 |
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160 str = t_strconcat("X-Status: ", |
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161 (ctx->msg_flags & MAIL_ANSWERED) ? "A" : "", |
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162 (ctx->msg_flags & MAIL_DRAFT) ? "D" : "", |
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163 (ctx->msg_flags & MAIL_FLAGGED) ? "F" : "", |
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164 (ctx->msg_flags & MAIL_DELETED) ? "T" : "", |
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165 x_status, NULL); |
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166 |
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167 if (io_buffer_send(ctx->outbuf, str, strlen(str)) < 0) |
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168 return FALSE; |
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169 if (io_buffer_send(ctx->outbuf, "\n", 1) < 0) |
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170 return FALSE; |
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171 |
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172 return TRUE; |
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173 } |
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174 |
184 | 175 static const char *strip_chars(const char *value, size_t value_len, |
160
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176 const char *list) |
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177 { |
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178 /* leave only unknown flags, very likely none */ |
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179 char *ret, *p; |
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180 unsigned int i; |
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181 |
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182 ret = p = t_buffer_get(value_len+1); |
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183 for (i = 0; i < value_len; i++) { |
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184 if (strchr(list, value[i]) == NULL) |
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185 *p++ = value[i]; |
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186 } |
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187 |
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188 if (ret == p) |
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189 return NULL; |
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190 *p = '\0'; |
184 | 191 t_buffer_alloc((size_t) (p-ret)+1); |
160
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192 return ret; |
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193 } |
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194 |
184 | 195 static void update_stripped_custom_flags(const char *value, size_t len, |
160
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196 int index, void *context) |
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197 { |
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198 TempString *str = context; |
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199 |
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200 if (index < 0) { |
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201 /* not found, keep it */ |
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202 if (str->len != 0) |
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203 t_string_append_c(str, ' '); |
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204 t_string_append_n(str, value, len); |
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205 } |
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206 } |
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207 |
184 | 208 static const char *strip_custom_flags(const char *value, size_t len, |
160
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209 MboxRewriteContext *ctx) |
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210 { |
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211 TempString *str; |
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212 |
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213 str = t_string_new(len+1); |
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214 mbox_keywords_parse(value, len, ctx->custom_flags, |
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215 update_stripped_custom_flags, str); |
362
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216 return str->len == 0 ? NULL : str->str; |
160
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217 } |
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218 |
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219 static void header_func(MessagePart *part __attr_unused__, |
184 | 220 const char *name, size_t name_len, |
221 const char *value, size_t value_len, | |
160
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222 void *context) |
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223 { |
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224 MboxRewriteContext *ctx = context; |
362
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225 const char *str; |
160
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226 char *end; |
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227 |
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228 if (ctx->failed) |
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229 return; |
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230 |
362
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231 if (name_len == 6 && strncasecmp(name, "Status", 6) == 0) { |
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232 ctx->status_found = TRUE; |
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233 str = strip_chars(value, value_len, "RO"); |
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234 (void)mbox_write_status(ctx, str); |
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235 } else if (name_len == 8 && strncasecmp(name, "X-Status", 8) == 0) { |
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|
236 ctx->xstatus_found = TRUE; |
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237 str = strip_chars(value, value_len, "ADFT"); |
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238 (void)mbox_write_xstatus(ctx, str); |
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239 } else if (name_len == 10 && strncasecmp(name, "X-Keywords", 10) == 0) { |
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diff
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|
240 ctx->ximapbase_found = TRUE; |
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312
diff
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|
241 str = strip_custom_flags(value, value_len, ctx); |
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242 (void)mbox_write_xkeywords(ctx, str); |
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diff
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|
243 } else if (name_len == 10 && strncasecmp(name, "X-IMAPbase", 10) == 0) { |
160
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|
244 if (ctx->seq == 1) { |
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|
245 /* temporarily copy the value to make sure we |
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|
246 don't overflow it */ |
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|
247 t_push(); |
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|
248 value = t_strndup(value, value_len); |
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249 ctx->uid_validity = strtoul(value, &end, 10); |
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250 while (*end == ' ') end++; |
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251 ctx->uid_last = strtoul(end, &end, 10); |
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252 t_pop(); |
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253 |
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254 ctx->ximapbase_found = TRUE; |
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255 (void)mbox_write_ximapbase(ctx); |
160
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256 } |
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257 } else { |
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258 /* save this header */ |
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259 (void)io_buffer_send(ctx->outbuf, name, name_len); |
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260 (void)io_buffer_send(ctx->outbuf, ": ", 2); |
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261 (void)io_buffer_send(ctx->outbuf, value, value_len); |
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262 (void)io_buffer_send(ctx->outbuf, "\n", 1); |
362
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263 } |
160
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264 |
362
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265 if (ctx->outbuf->closed) |
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266 ctx->failed = TRUE; |
160
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267 } |
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268 |
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269 static int mbox_write_header(MailIndex *index, |
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270 MailIndexRecord *rec, unsigned int seq, |
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271 IOBuffer *inbuf, IOBuffer *outbuf, |
180
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272 uoff_t end_offset) |
160
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273 { |
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274 /* We need to update fields that define message flags. Standard fields |
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275 are stored in Status and X-Status. For custom flags we use |
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276 uw-imapd compatible format, by first listing them in first message's |
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277 X-IMAPbase field and actually defining them in X-Keywords field. |
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278 |
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279 Format of X-IMAPbase is: <UID validity> <last used UID> <flag names> |
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280 |
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281 We don't want to sync our UIDs with the mbox file, so the UID |
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282 validity is always kept different from our internal UID validity. |
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283 Last used UID is also not updated, and set to 0 initially. |
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284 */ |
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285 MboxRewriteContext ctx; |
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286 MessageSize hdr_size; |
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287 |
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288 if (inbuf->offset >= end_offset) { |
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289 /* fsck should have noticed it.. */ |
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290 index_set_error(index, "Error rewriting mbox file %s: " |
221
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291 "Unexpected end of file", index->mbox_path); |
160
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292 return FALSE; |
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293 } |
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294 |
180
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295 t_push(); |
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296 |
160
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297 /* parse the header, write the fields we don't want to change */ |
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298 memset(&ctx, 0, sizeof(ctx)); |
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299 ctx.outbuf = outbuf; |
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300 ctx.seq = seq; |
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301 ctx.msg_flags = rec->msg_flags; |
362
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302 ctx.uid_validity = index->header->uid_validity-1; |
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303 ctx.custom_flags = mail_custom_flags_list_get(index->custom_flags); |
160
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304 |
290
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305 io_buffer_set_read_limit(inbuf, inbuf->offset + rec->header_size); |
160
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306 message_parse_header(NULL, inbuf, &hdr_size, header_func, &ctx); |
290
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307 io_buffer_set_read_limit(inbuf, 0); |
160
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308 |
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309 i_assert(hdr_size.physical_size == rec->header_size); |
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310 |
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311 /* append the flag fields */ |
362
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312 if (seq == 1 && !ctx.ximapbase_found) { |
160
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313 /* write X-IMAPbase header to first message */ |
362
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314 (void)mbox_write_ximapbase(&ctx); |
160
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315 } |
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316 |
362
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317 if (!ctx.xkeywords_found) |
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318 (void)mbox_write_xkeywords(&ctx, NULL); |
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319 if (!ctx.status_found) |
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320 (void)mbox_write_status(&ctx, NULL); |
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321 if (!ctx.xstatus_found) |
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322 (void)mbox_write_xstatus(&ctx, NULL); |
160
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323 |
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324 t_pop(); |
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325 |
180
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326 mail_custom_flags_list_unref(index->custom_flags); |
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327 |
160
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328 /* empty line ends headers */ |
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329 (void)io_buffer_send(outbuf, "\n", 1); |
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330 |
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331 return TRUE; |
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332 } |
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333 |
312
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334 static int fd_copy(int in_fd, int out_fd, uoff_t out_offset) |
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335 { |
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336 IOBuffer *inbuf, *outbuf; |
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337 int ret; |
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338 |
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339 i_assert(out_offset <= OFF_T_MAX); |
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340 |
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341 if (lseek(in_fd, 0, SEEK_SET) < 0) |
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342 return -1; |
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343 if (lseek(out_fd, (off_t)out_offset, SEEK_SET) < 0) |
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344 return -1; |
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345 |
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346 inbuf = io_buffer_create_mmap(in_fd, default_pool, 65536, 0); |
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347 outbuf = io_buffer_create_file(out_fd, default_pool, 1024); |
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348 |
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349 ret = io_buffer_send_iobuffer(outbuf, inbuf, inbuf->size); |
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350 if (ret < 0) |
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351 errno = outbuf->buf_errno; |
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352 else { |
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353 /* we may have shrinked the file */ |
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354 i_assert(out_offset + inbuf->size <= OFF_T_MAX); |
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355 ret = ftruncate(out_fd, (off_t) (out_offset + inbuf->size)); |
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356 } |
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357 |
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358 io_buffer_destroy(outbuf); |
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359 io_buffer_destroy(inbuf); |
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360 |
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361 return ret; |
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362 } |
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363 |
180
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364 int mbox_index_rewrite(MailIndex *index) |
160
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365 { |
312
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366 /* Write messages beginning from the first dirty one to temp file, |
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367 then copy it over the mbox file. This may create data loss if |
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368 interrupted (see below). This rewriting relies quite a lot on |
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369 valid header/body sizes which fsck() should have ensured. */ |
160
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370 MailIndexRecord *rec; |
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371 IOBuffer *inbuf, *outbuf; |
312
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372 uoff_t offset, dirty_offset; |
160
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373 const char *path; |
194 | 374 unsigned int seq; |
312
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375 int mbox_fd, tmp_fd, failed, dirty_found, locked, rewrite; |
160
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376 |
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377 i_assert(index->lock_type == MAIL_LOCK_EXCLUSIVE); |
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378 |
303
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379 if ((index->header->flags & MAIL_INDEX_FLAG_DIRTY_MESSAGES) == 0) { |
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380 /* no need to rewrite */ |
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381 return TRUE; |
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382 } |
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383 |
312
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384 mbox_fd = tmp_fd = -1; locked = FALSE; |
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385 failed = TRUE; rewrite = FALSE; |
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386 do { |
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387 /* lock before fscking to prevent race conditions between |
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388 fsck's unlock and our lock. */ |
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389 mbox_fd = open(index->mbox_path, O_RDWR); |
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390 if (mbox_fd == -1) { |
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391 mbox_set_syscall_error(index, "open()"); |
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392 break; |
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393 } |
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394 |
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395 if (!mbox_lock(index, index->mbox_path, mbox_fd, TRUE)) |
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396 break; |
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397 locked = TRUE; |
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398 |
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399 if (!mbox_index_fsck(index)) |
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400 break; |
301
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401 |
312
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402 if ((index->header->flags & |
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403 MAIL_INDEX_FLAG_DIRTY_MESSAGES) == 0) { |
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404 /* fsck() figured out there's no dirty messages |
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405 after all */ |
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406 failed = FALSE; rewrite = FALSE; |
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407 break; |
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408 } |
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409 |
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410 tmp_fd = mail_index_create_temp_file(index, &path); |
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411 if (tmp_fd == -1) |
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412 break; |
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413 |
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414 failed = FALSE; rewrite = TRUE; |
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415 } while (0); |
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416 |
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417 if (!rewrite) { |
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418 if (locked) |
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419 (void)mbox_unlock(index, index->mbox_path, mbox_fd); |
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420 if (mbox_fd != -1 && close(mbox_fd) < 0) |
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421 mbox_set_syscall_error(index, "close()"); |
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422 return !failed; |
160
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423 } |
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424 |
312
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425 if (index->header->flags & MAIL_INDEX_FLAG_DIRTY_CUSTOMFLAGS) { |
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426 /* need to update X-IMAPbase in first message */ |
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427 dirty_found = TRUE; |
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428 } else { |
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429 dirty_found = FALSE; |
160
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430 } |
312
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431 dirty_offset = 0; |
298
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432 |
312
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433 inbuf = io_buffer_create_mmap(mbox_fd, default_pool, |
298
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434 MAIL_MMAP_BLOCK_SIZE, 0); |
312
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435 outbuf = io_buffer_create_file(tmp_fd, default_pool, 8192); |
160
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436 |
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437 failed = FALSE; seq = 1; |
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438 rec = index->lookup(index, 1); |
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439 while (rec != NULL) { |
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440 /* get offset to beginning of mail headers */ |
221
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441 if (!mbox_mail_get_start_offset(index, rec, &offset)) { |
160
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442 /* fsck should have fixed it */ |
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443 failed = TRUE; |
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444 break; |
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|
445 } |
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446 |
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447 if (offset + rec->header_size + rec->body_size > inbuf->size) { |
221
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448 index_set_corrupted(index, "Invalid message size"); |
160
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449 failed = TRUE; |
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450 break; |
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451 } |
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452 |
312
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453 if (!dirty_found && |
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454 (rec->index_flags & INDEX_MAIL_FLAG_DIRTY)) { |
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455 /* first dirty message */ |
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456 dirty_found = TRUE; |
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457 dirty_offset = offset; |
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458 |
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459 io_buffer_seek(inbuf, dirty_offset); |
160
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460 } |
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461 |
312
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462 if (dirty_found) { |
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463 /* write the From-line */ |
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464 if (!mbox_write(index, inbuf, outbuf, offset)) { |
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465 failed = TRUE; |
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466 break; |
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467 } |
160
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468 |
312
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469 /* write header, updating flag fields */ |
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470 offset += rec->header_size; |
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471 if (!mbox_write_header(index, rec, seq, inbuf, outbuf, |
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472 offset)) { |
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473 failed = TRUE; |
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474 break; |
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475 } |
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476 |
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477 /* write body */ |
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478 offset += rec->body_size; |
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479 if (!mbox_write(index, inbuf, outbuf, offset)) { |
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480 failed = TRUE; |
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481 break; |
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482 } |
160
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483 } |
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484 |
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485 seq++; |
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486 rec = index->next(index, rec); |
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487 } |
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488 |
312
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489 if (!dirty_found) { |
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490 index_set_error(index, "Expected dirty messages not found " |
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491 "from mbox file %s", index->mbox_path); |
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492 failed = TRUE; |
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493 } |
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494 |
160
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495 /* always end with a \n */ |
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496 (void)io_buffer_send(outbuf, "\n", 1); |
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497 if (outbuf->closed) { |
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498 errno = outbuf->buf_errno; |
221
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499 mbox_set_syscall_error(index, "write()"); |
160
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500 failed = TRUE; |
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501 } |
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502 |
312
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503 io_buffer_destroy(outbuf); |
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504 io_buffer_destroy(inbuf); |
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505 |
160
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506 if (!failed) { |
312
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507 /* POSSIBLE DATA LOSS HERE. We're writing to the mbox file, |
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508 so if we get killed here before finished, we'll lose some |
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509 bytes. I can't really think of any way to fix this, |
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510 rename() is problematic too especially because of file |
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511 locking issues (new mail could be lost). |
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512 |
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513 Usually we're moving the data by just a few bytes, so |
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514 the data loss should never be more than those few bytes.. |
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515 If we moved more, we could have written the file from end |
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516 to beginning in blocks (it'd be a bit slow to do it in |
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517 blocks of ~1-10 bytes which is the usual case, so we don't |
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518 bother). |
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519 |
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520 Also, we might as well be shrinking the file, in which |
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521 case we can't lose data. */ |
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522 if (fd_copy(tmp_fd, mbox_fd, dirty_offset) == 0) { |
269
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523 /* all ok, we need to fsck the index next time. |
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524 use set_flags because set_lock() would remove it |
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525 if we modified it directly */ |
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526 index->set_flags |= MAIL_INDEX_FLAG_FSCK; |
160
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527 reset_dirty_flags(index); |
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528 } else { |
312
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529 mbox_set_syscall_error(index, "fd_copy()"); |
160
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530 failed = TRUE; |
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531 } |
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|
532 } |
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|
533 |
312
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534 (void)mbox_unlock(index, index->mbox_path, mbox_fd); |
160
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535 (void)unlink(path); |
297
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|
536 |
312
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537 if (close(mbox_fd) < 0) |
298
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538 mbox_set_syscall_error(index, "close()"); |
312
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539 if (close(tmp_fd) < 0) |
297
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540 index_file_set_syscall_error(index, path, "close()"); |
160
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|
541 return failed; |
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|
542 } |