Mercurial > dovecot > core-2.2
annotate src/lib-storage/index/dbox-single/sdbox-file.c @ 20215:389c5094c2a8
lib-dcrypt: Initial implementation
author | Aki Tuomi <aki.tuomi@dovecot.fi> |
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date | Wed, 27 Apr 2016 14:08:00 +0300 |
parents | 932a63ff512e |
children | 0fd0fb05e2b3 |
rev | line source |
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1 /* Copyright (c) 2007-2016 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 "eacces-error.h" |
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5 #include "fdatasync-path.h" |
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6 #include "mkdir-parents.h" |
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7 #include "istream.h" |
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8 #include "ostream.h" |
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9 #include "str.h" |
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10 #include "fs-api.h" |
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11 #include "dbox-attachment.h" |
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12 #include "sdbox-storage.h" |
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13 #include "sdbox-file.h" |
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14 |
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15 #include <stdio.h> |
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16 #include <utime.h> |
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17 |
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18 static void sdbox_file_init_paths(struct sdbox_file *file, const char *fname) |
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19 { |
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20 struct mailbox *box = &file->mbox->box; |
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21 const char *alt_path; |
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22 |
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23 i_free(file->file.primary_path); |
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24 i_free(file->file.alt_path); |
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25 file->file.primary_path = |
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26 i_strdup_printf("%s/%s", mailbox_get_path(box), fname); |
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27 file->file.cur_path = file->file.primary_path; |
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28 |
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29 if (mailbox_get_path_to(box, MAILBOX_LIST_PATH_TYPE_ALT_MAILBOX, |
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30 &alt_path) > 0) |
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31 file->file.alt_path = i_strdup_printf("%s/%s", alt_path, fname); |
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32 } |
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33 |
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34 struct dbox_file *sdbox_file_init(struct sdbox_mailbox *mbox, uint32_t uid) |
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35 { |
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36 struct sdbox_file *file; |
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37 const char *fname; |
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38 |
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39 file = i_new(struct sdbox_file, 1); |
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40 file->file.storage = &mbox->storage->storage; |
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41 file->mbox = mbox; |
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42 T_BEGIN { |
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43 if (uid != 0) { |
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44 fname = t_strdup_printf(SDBOX_MAIL_FILE_FORMAT, uid); |
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45 sdbox_file_init_paths(file, fname); |
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46 file->uid = uid; |
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47 } else { |
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48 sdbox_file_init_paths(file, dbox_generate_tmp_filename()); |
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49 } |
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50 } T_END; |
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51 dbox_file_init(&file->file); |
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52 return &file->file; |
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53 } |
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54 |
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55 struct dbox_file *sdbox_file_create(struct sdbox_mailbox *mbox) |
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56 { |
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57 struct dbox_file *file; |
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58 |
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59 file = sdbox_file_init(mbox, 0); |
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60 file->fd = file->storage->v. |
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61 file_create_fd(file, file->primary_path, FALSE); |
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62 return file; |
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63 } |
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64 |
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65 void sdbox_file_free(struct dbox_file *file) |
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66 { |
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67 struct sdbox_file *sfile = (struct sdbox_file *)file; |
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68 |
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69 if (sfile->attachment_pool != NULL) |
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70 pool_unref(&sfile->attachment_pool); |
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71 dbox_file_free(file); |
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72 } |
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73 |
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74 int sdbox_file_get_attachments(struct dbox_file *file, const char **extrefs_r) |
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75 { |
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76 const char *line; |
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77 bool deleted; |
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78 int ret; |
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79 |
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80 *extrefs_r = NULL; |
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81 |
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82 /* read the metadata */ |
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83 ret = dbox_file_open(file, &deleted); |
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84 if (ret > 0) { |
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85 if (deleted) |
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86 return 0; |
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87 if ((ret = dbox_file_seek(file, 0)) > 0) |
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88 ret = dbox_file_metadata_read(file); |
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89 } |
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90 if (ret <= 0) { |
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91 if (ret < 0) |
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92 return -1; |
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93 /* corrupted file. we're deleting it anyway. */ |
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94 line = NULL; |
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95 } else { |
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96 line = dbox_file_metadata_get(file, DBOX_METADATA_EXT_REF); |
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97 } |
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98 if (line == NULL) { |
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99 /* no attachments */ |
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100 return 0; |
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101 } |
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102 *extrefs_r = line; |
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103 return 1; |
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104 } |
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105 |
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106 const char * |
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107 sdbox_file_attachment_relpath(struct sdbox_file *file, const char *srcpath) |
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108 { |
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109 const char *p; |
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110 |
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111 p = strchr(srcpath, '-'); |
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112 if (p == NULL) { |
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113 mail_storage_set_critical(file->mbox->box.storage, |
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114 "sdbox attachment path in invalid format: %s", srcpath); |
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115 } else { |
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116 p = strchr(p+1, '-'); |
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117 } |
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118 return t_strdup_printf("%s-%s-%u", |
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119 p == NULL ? srcpath : t_strdup_until(srcpath, p), |
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120 guid_128_to_string(file->mbox->mailbox_guid), |
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121 file->uid); |
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122 } |
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123 |
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124 static int sdbox_file_rename_attachments(struct sdbox_file *file) |
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125 { |
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126 struct dbox_storage *storage = file->file.storage; |
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127 struct fs_file *src_file, *dest_file; |
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128 const char *const *pathp, *src, *dest; |
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129 int ret = 0; |
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130 |
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131 array_foreach(&file->attachment_paths, pathp) T_BEGIN { |
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132 src = t_strdup_printf("%s/%s", storage->attachment_dir, *pathp); |
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133 dest = t_strdup_printf("%s/%s", storage->attachment_dir, |
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134 sdbox_file_attachment_relpath(file, *pathp)); |
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135 src_file = fs_file_init(storage->attachment_fs, src, |
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136 FS_OPEN_MODE_READONLY); |
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137 dest_file = fs_file_init(storage->attachment_fs, dest, |
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138 FS_OPEN_MODE_READONLY); |
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139 if (fs_rename(src_file, dest_file) < 0) { |
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140 mail_storage_set_critical(&storage->storage, "%s", |
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141 fs_last_error(storage->attachment_fs)); |
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142 ret = -1; |
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143 } |
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144 fs_file_deinit(&src_file); |
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145 fs_file_deinit(&dest_file); |
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146 } T_END; |
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147 return ret; |
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148 } |
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149 |
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150 int sdbox_file_assign_uid(struct sdbox_file *file, uint32_t uid) |
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151 { |
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152 const char *p, *old_path, *dir, *new_fname, *new_path; |
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153 struct stat st; |
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154 |
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155 i_assert(file->uid == 0); |
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156 i_assert(uid != 0); |
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157 |
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158 old_path = file->file.cur_path; |
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159 p = strrchr(old_path, '/'); |
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160 i_assert(p != NULL); |
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161 dir = t_strdup_until(old_path, p); |
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162 |
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163 new_fname = t_strdup_printf(SDBOX_MAIL_FILE_FORMAT, uid); |
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164 new_path = t_strdup_printf("%s/%s", dir, new_fname); |
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165 |
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166 if (stat(new_path, &st) == 0) { |
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167 mail_storage_set_critical(&file->file.storage->storage, |
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168 "sdbox: %s already exists, rebuilding index", new_path); |
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169 sdbox_set_mailbox_corrupted(&file->mbox->box); |
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170 return -1; |
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171 } |
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172 if (rename(old_path, new_path) < 0) { |
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173 mail_storage_set_critical(&file->file.storage->storage, |
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174 "rename(%s, %s) failed: %m", |
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175 old_path, new_path); |
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176 return -1; |
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177 } |
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178 sdbox_file_init_paths(file, new_fname); |
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179 file->uid = uid; |
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180 |
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181 if (array_is_created(&file->attachment_paths)) { |
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182 if (sdbox_file_rename_attachments(file) < 0) |
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183 return -1; |
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184 } |
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185 return 0; |
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186 } |
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187 |
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188 static int sdbox_file_unlink_aborted_save_attachments(struct sdbox_file *file) |
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189 { |
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190 struct dbox_storage *storage = file->file.storage; |
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191 struct fs *fs = storage->attachment_fs; |
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192 struct fs_file *fs_file; |
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193 const char *const *pathp, *path; |
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194 int ret = 0; |
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195 |
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196 array_foreach(&file->attachment_paths, pathp) T_BEGIN { |
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197 /* we don't know if we aborted before renaming this attachment, |
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198 so try deleting both source and dest path. the source paths |
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199 point to temporary files (not to source messages' |
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200 attachment paths), so it's safe to delete them. */ |
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201 path = t_strdup_printf("%s/%s", storage->attachment_dir, |
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202 *pathp); |
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203 fs_file = fs_file_init(fs, path, FS_OPEN_MODE_READONLY); |
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204 if (fs_delete(fs_file) < 0 && |
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205 errno != ENOENT) { |
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206 mail_storage_set_critical(&storage->storage, "%s", |
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207 fs_last_error(fs)); |
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208 ret = -1; |
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209 } |
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210 fs_file_deinit(&fs_file); |
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211 |
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212 path = t_strdup_printf("%s/%s", storage->attachment_dir, |
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213 sdbox_file_attachment_relpath(file, *pathp)); |
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214 fs_file = fs_file_init(fs, path, FS_OPEN_MODE_READONLY); |
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215 if (fs_delete(fs_file) < 0 && |
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216 errno != ENOENT) { |
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217 mail_storage_set_critical(&storage->storage, "%s", |
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218 fs_last_error(fs)); |
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219 ret = -1; |
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220 } |
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221 fs_file_deinit(&fs_file); |
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222 } T_END; |
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223 return ret; |
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224 } |
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225 |
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226 int sdbox_file_unlink_aborted_save(struct sdbox_file *file) |
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227 { |
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228 int ret = 0; |
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229 |
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230 if (unlink(file->file.cur_path) < 0) { |
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231 mail_storage_set_critical(file->mbox->box.storage, |
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232 "unlink(%s) failed: %m", file->file.cur_path); |
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233 ret = -1; |
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234 } |
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235 if (array_is_created(&file->attachment_paths)) { |
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236 if (sdbox_file_unlink_aborted_save_attachments(file) < 0) |
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237 ret = -1; |
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238 } |
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239 return ret; |
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240 } |
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241 |
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242 int sdbox_file_create_fd(struct dbox_file *file, const char *path, bool parents) |
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243 { |
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244 struct sdbox_file *sfile = (struct sdbox_file *)file; |
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245 struct mailbox *box = &sfile->mbox->box; |
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246 const struct mailbox_permissions *perm = mailbox_get_permissions(box); |
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247 const char *p, *dir; |
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248 mode_t old_mask; |
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249 int fd; |
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250 |
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251 old_mask = umask(0666 & ~perm->file_create_mode); |
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252 fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0666); |
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253 umask(old_mask); |
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254 if (fd == -1 && errno == ENOENT && parents && |
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255 (p = strrchr(path, '/')) != NULL) { |
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256 dir = t_strdup_until(path, p); |
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257 if (mkdir_parents_chgrp(dir, perm->dir_create_mode, |
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258 perm->file_create_gid, |
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sdbox: Fixed race condition when two processes mkdir() the same directory
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259 perm->file_create_gid_origin) < 0 && |
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260 errno != EEXIST) { |
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261 mail_storage_set_critical(box->storage, |
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262 "mkdir_parents(%s) failed: %m", dir); |
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263 return -1; |
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264 } |
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265 /* try again */ |
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266 old_mask = umask(0666 & ~perm->file_create_mode); |
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267 fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0666); |
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268 umask(old_mask); |
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269 } |
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270 if (fd == -1) { |
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271 mail_storage_set_critical(box->storage, |
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272 "open(%s, O_CREAT) failed: %m", path); |
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273 } else if (perm->file_create_gid == (gid_t)-1) { |
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274 /* no group change */ |
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275 } else if (fchown(fd, (uid_t)-1, perm->file_create_gid) < 0) { |
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276 if (errno == EPERM) { |
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277 mail_storage_set_critical(box->storage, "%s", |
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278 eperm_error_get_chgrp("fchown", path, |
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279 perm->file_create_gid, |
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280 perm->file_create_gid_origin)); |
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281 } else { |
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282 mail_storage_set_critical(box->storage, |
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283 "fchown(%s, -1, %ld) failed: %m", |
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284 path, (long)perm->file_create_gid); |
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285 } |
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286 /* continue anyway */ |
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287 } |
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288 return fd; |
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289 } |
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290 |
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291 int sdbox_file_move(struct dbox_file *file, bool alt_path) |
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292 { |
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293 struct mail_storage *storage = &file->storage->storage; |
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294 struct ostream *output; |
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295 const char *dest_dir, *temp_path, *dest_path, *p; |
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296 struct stat st; |
14009
10320252b521
sdbox: Preserve file's atime/mtime when moving it to alt storage.
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297 struct utimbuf ut; |
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298 bool deleted; |
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299 int out_fd, ret = 0; |
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300 |
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301 i_assert(file->input != NULL); |
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302 |
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303 if (dbox_file_is_in_alt(file) == alt_path) |
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304 return 0; |
20204
932a63ff512e
sdbox: Make sure we don't crash when altmove-flag is set but alt path is missing.
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305 if (file->alt_path == NULL) |
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306 return 0; |
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307 |
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308 if (stat(file->cur_path, &st) < 0 && errno == ENOENT) { |
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309 /* already expunged/moved by another session */ |
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310 return 0; |
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311 } |
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312 |
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313 dest_path = !alt_path ? file->primary_path : file->alt_path; |
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lib-dcrypt: Initial implementation
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314 |
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315 i_assert(dest_path != NULL); |
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316 |
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317 p = strrchr(dest_path, '/'); |
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318 i_assert(p != NULL); |
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319 dest_dir = t_strdup_until(dest_path, p); |
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320 temp_path = t_strdup_printf("%s/%s", dest_dir, |
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321 dbox_generate_tmp_filename()); |
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322 |
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323 /* first copy the file. make sure to catch every possible error |
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324 since we really don't want to break the file. */ |
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325 out_fd = file->storage->v.file_create_fd(file, temp_path, TRUE); |
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326 if (out_fd == -1) |
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327 return -1; |
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328 |
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329 output = o_stream_create_fd_file(out_fd, 0, FALSE); |
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330 i_stream_seek(file->input, 0); |
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331 while ((ret = o_stream_send_istream(output, file->input)) > 0) ; |
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332 if (o_stream_nfinish(output) < 0) { |
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333 mail_storage_set_critical(storage, "write(%s) failed: %m", |
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334 temp_path); |
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335 ret = -1; |
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336 } else if (file->input->stream_errno != 0) { |
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337 errno = file->input->stream_errno; |
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338 dbox_file_set_syscall_error(file, "ftruncate()"); |
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339 ret = -1; |
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340 } else if (ret < 0) { |
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341 mail_storage_set_critical(storage, |
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342 "o_stream_send_istream(%s, %s) " |
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343 "failed with unknown error", |
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344 temp_path, file->cur_path); |
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345 } |
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346 o_stream_unref(&output); |
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347 |
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348 if (storage->set->parsed_fsync_mode != FSYNC_MODE_NEVER && ret == 0) { |
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349 if (fsync(out_fd) < 0) { |
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350 mail_storage_set_critical(storage, |
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351 "fsync(%s) failed: %m", temp_path); |
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352 ret = -1; |
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353 } |
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354 } |
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355 if (close(out_fd) < 0) { |
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356 mail_storage_set_critical(storage, |
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357 "close(%s) failed: %m", temp_path); |
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358 ret = -1; |
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359 } |
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360 if (ret < 0) { |
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361 i_unlink(temp_path); |
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362 return -1; |
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363 } |
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364 /* preserve the original atime/mtime. this isn't necessary for Dovecot, |
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365 but could be useful for external reasons. */ |
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366 ut.actime = st.st_atime; |
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367 ut.modtime = st.st_mtime; |
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368 if (utime(temp_path, &ut) < 0) { |
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369 mail_storage_set_critical(storage, |
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370 "utime(%s) failed: %m", temp_path); |
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371 } |
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372 |
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373 /* the temp file was successfully written. rename it now to the |
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374 destination file. the destination shouldn't exist, but if it does |
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375 its contents should be the same (except for maybe older metadata) */ |
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376 if (rename(temp_path, dest_path) < 0) { |
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377 mail_storage_set_critical(storage, |
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378 "rename(%s, %s) failed: %m", temp_path, dest_path); |
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379 i_unlink_if_exists(temp_path); |
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380 return -1; |
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381 } |
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382 if (storage->set->parsed_fsync_mode != FSYNC_MODE_NEVER) { |
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383 if (fdatasync_path(dest_dir) < 0) { |
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384 mail_storage_set_critical(storage, |
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385 "fdatasync(%s) failed: %m", dest_dir); |
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386 i_unlink(dest_path); |
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387 return -1; |
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388 } |
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389 } |
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390 if (unlink(file->cur_path) < 0) { |
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391 dbox_file_set_syscall_error(file, "unlink()"); |
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392 if (errno == EACCES) { |
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393 /* configuration problem? revert the write */ |
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394 i_unlink(dest_path); |
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395 } |
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396 /* who knows what happened to the file. keep both just to be |
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397 sure both won't get deleted. */ |
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398 return -1; |
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399 } |
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400 |
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401 /* file was successfully moved - reopen it */ |
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402 dbox_file_close(file); |
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403 if (dbox_file_open(file, &deleted) <= 0) { |
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404 mail_storage_set_critical(storage, |
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405 "dbox_file_move(%s): reopening file failed", dest_path); |
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406 return -1; |
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407 } |
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408 return 0; |
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409 } |
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410 |
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411 static int |
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412 sdbox_unlink_attachments(struct sdbox_file *sfile, |
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413 const ARRAY_TYPE(mail_attachment_extref) *extrefs) |
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414 { |
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415 struct dbox_storage *storage = sfile->file.storage; |
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416 const struct mail_attachment_extref *extref; |
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417 const char *path; |
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418 int ret = 0; |
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419 |
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420 array_foreach(extrefs, extref) T_BEGIN { |
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421 path = sdbox_file_attachment_relpath(sfile, extref->path); |
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422 if (index_attachment_delete(&storage->storage, |
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423 storage->attachment_fs, path) < 0) |
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424 ret = -1; |
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425 } T_END; |
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426 return ret; |
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427 } |
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428 |
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429 int sdbox_file_unlink_with_attachments(struct sdbox_file *sfile) |
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430 { |
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431 ARRAY_TYPE(mail_attachment_extref) extrefs; |
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432 const char *extrefs_line; |
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433 pool_t pool; |
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434 int ret; |
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435 |
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436 ret = sdbox_file_get_attachments(&sfile->file, &extrefs_line); |
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437 if (ret < 0) |
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438 return -1; |
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439 if (ret == 0) { |
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440 /* no attachments */ |
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441 return dbox_file_unlink(&sfile->file); |
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442 } |
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443 |
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444 pool = pool_alloconly_create("sdbox attachments unlink", 1024); |
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445 p_array_init(&extrefs, pool, 16); |
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446 if (!index_attachment_parse_extrefs(extrefs_line, pool, &extrefs)) { |
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447 i_warning("%s: Ignoring corrupted extref: %s", |
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448 sfile->file.cur_path, extrefs_line); |
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449 array_clear(&extrefs); |
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450 } |
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451 |
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452 /* try to delete the file first, so if it fails we don't have |
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453 missing attachments */ |
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454 if ((ret = dbox_file_unlink(&sfile->file)) >= 0) |
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455 (void)sdbox_unlink_attachments(sfile, &extrefs); |
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456 pool_unref(&pool); |
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457 return ret; |
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458 } |