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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 "unlink-directory.h"
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5 #include "subscription-file/subscription-file.h"
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6 #include "maildir-index.h"
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7 #include "maildir-storage.h"
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8
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <unistd.h>
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12 #include <sys/stat.h>
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13
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14 #define CREATE_MODE 0770 /* umask() should limit it more */
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15
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16 extern MailStorage maildir_storage;
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17 static Mailbox maildir_mailbox;
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18
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19 static const char *maildirs[] = { "cur", "new", "tmp", NULL };
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20
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21 static MailStorage *maildir_create(const char *data)
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22 {
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23 MailStorage *storage;
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24 const char *home, *path;
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25
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26 if (data == NULL || *data == '\0') {
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27 /* we'll need to figure out the maildir location ourself.
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28 it's either root dir if we've already chroot()ed, or
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29 $HOME/Maildir otherwise */
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30 if (access("/cur", R_OK|W_OK|X_OK) == 0)
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31 data = "/";
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32 else {
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33 home = getenv("HOME");
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34 if (home != NULL) {
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35 path = t_strconcat(home, "/Maildir", NULL);
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36 if (access(path, R_OK|W_OK|X_OK) == 0)
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37 data = path;
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38 }
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39 }
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40 }
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41
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42 if (data == NULL)
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43 return NULL;
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44
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45 storage = i_new(MailStorage, 1);
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46 memcpy(storage, &maildir_storage, sizeof(MailStorage));
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47
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48 storage->dir = i_strdup(data);
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49 return storage;
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50 }
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51
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52 static void maildir_free(MailStorage *storage)
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53 {
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54 i_free(storage->dir);
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55 i_free(storage);
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56 }
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57
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58 static int maildir_autodetect(const char *data)
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59 {
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60 struct stat st;
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61
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62 return stat(t_strconcat(data, "/cur", NULL), &st) == 0 &&
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63 S_ISDIR(st.st_mode);
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64 }
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65
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66 static int maildir_is_valid_name(MailStorage *storage, const char *name)
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67 {
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68 return name[0] != '\0' && name[0] != storage->hierarchy_sep &&
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69 strchr(name, '/') == NULL;
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70 }
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71
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72 /* create or fix maildir, ignore if it already exists */
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73 static int create_maildir(const char *dir, int verify)
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74 {
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75 const char **tmp;
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76 char path[1024];
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77
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78 if (mkdir(dir, CREATE_MODE) == -1 && (errno != EEXIST || !verify))
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79 return FALSE;
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80
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81 for (tmp = maildirs; *tmp != NULL; tmp++) {
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82 i_snprintf(path, sizeof(path), "%s/%s", dir, *tmp);
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83
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84 if (mkdir(path, CREATE_MODE) == -1 &&
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85 (errno != EEXIST || !verify))
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86 return FALSE;
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87 }
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88
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89 return TRUE;
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90 }
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91
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92 static int verify_inbox(MailStorage *storage, const char *dir)
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93 {
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94 const char **tmp;
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95 char src[1024], dest[1024];
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96
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97 /* first make sure the cur/ new/ and tmp/ dirs exist in root dir */
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98 (void)create_maildir(dir, TRUE);
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99
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100 /* create the .INBOX directory */
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101 i_snprintf(dest, sizeof(dest), "%s/.INBOX", dir);
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102 if (mkdir(dest, CREATE_MODE) == -1 && errno != EEXIST) {
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103 mail_storage_set_critical(storage, "Can't create directory "
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104 "%s: %m", dest);
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105 return FALSE;
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106 }
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107
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108 /* then symlink the cur/ new/ and tmp/ into the .INBOX/ directory */
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109 for (tmp = maildirs; *tmp != NULL; tmp++) {
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110 i_snprintf(src, sizeof(src), "../%s", *tmp);
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111 i_snprintf(dest, sizeof(dest), "%s/.INBOX/%s", dir, *tmp);
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112
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113 if (symlink(src, dest) == -1 && errno != EEXIST) {
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114 mail_storage_set_critical(storage, "symlink(%s, %s) "
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115 "failed: %m", src, dest);
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116 return FALSE;
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117 }
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118 }
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119
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120 return TRUE;
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121 }
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122
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123 static Mailbox *maildir_open(MailStorage *storage, const char *name,
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124 int readonly)
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125 {
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126 IndexMailbox *ibox;
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127 const char *path;
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128
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129 path = t_strconcat(storage->dir, "/.", name, NULL);
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130
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131 ibox = index_storage_init(storage, &maildir_mailbox,
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132 maildir_index_alloc(path), name, readonly);
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133 if (ibox != NULL)
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134 ibox->expunge_locked = maildir_expunge_locked;
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135 return (Mailbox *) ibox;
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136 }
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137
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138 static Mailbox *maildir_open_mailbox(MailStorage *storage, const char *name,
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139 int readonly)
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140 {
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141 struct stat st;
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142 char path[1024];
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143
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144 mail_storage_clear_error(storage);
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145
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146 /* INBOX is always case-insensitive */
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147 if (strcasecmp(name, "INBOX") == 0) {
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148 if (!verify_inbox(storage, storage->dir))
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149 return NULL;
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150 return maildir_open(storage, "INBOX", readonly);
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151 }
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152
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153 i_snprintf(path, sizeof(path), "%s/.%s", storage->dir, name);
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154 if (stat(path, &st) == 0) {
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155 /* exists - make sure the required directories are also there */
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156 (void)create_maildir(path, TRUE);
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157
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158 return maildir_open(storage, name, readonly);
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159 } else if (errno == ENOENT) {
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160 mail_storage_set_error(storage, "Mailbox doesn't exist");
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161 return NULL;
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162 } else {
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163 mail_storage_set_critical(storage, "Can't open mailbox %s: %m",
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164 name);
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165 return NULL;
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166 }
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167 }
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168
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169 static int maildir_create_mailbox(MailStorage *storage, const char *name)
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170 {
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171 char path[1024];
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172
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173 mail_storage_clear_error(storage);
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174
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175 if (strcasecmp(name, "INBOX") == 0)
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176 name = "INBOX";
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177
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178 if (!maildir_is_valid_name(storage, name)) {
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179 mail_storage_set_error(storage, "Invalid mailbox name");
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180 return FALSE;
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181 }
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182
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183 i_snprintf(path, sizeof(path), "%s/.%s", storage->dir, name);
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184 if (create_maildir(path, FALSE))
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185 return TRUE;
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186 else if (errno == EEXIST) {
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187 mail_storage_set_error(storage, "Mailbox already exists");
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188 return FALSE;
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189 } else {
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190 mail_storage_set_critical(storage, "Can't create mailbox "
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191 "%s: %m", name);
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192 return FALSE;
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193 }
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194 }
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195
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196 static int maildir_delete_mailbox(MailStorage *storage, const char *name)
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197 {
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198 struct stat st;
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199 char src[1024], dest[1024];
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200 int count;
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201
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202 mail_storage_clear_error(storage);
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203
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204 if (strcasecmp(name, "INBOX") == 0) {
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205 mail_storage_set_error(storage, "INBOX can't be deleted.");
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206 return FALSE;
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207 }
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208
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209 /* rename the .maildir into ..maildir which marks it as being
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210 deleted. this way we never see partially deleted maildirs. */
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211 i_snprintf(src, sizeof(src), "%s/.%s", storage->dir, name);
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212 i_snprintf(dest, sizeof(dest), "%s/..%s", storage->dir, name);
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213
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214 if (stat(src, &st) != 0 && errno == ENOENT) {
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215 mail_storage_set_error(storage, "Mailbox doesn't exist.");
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216 return FALSE;
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217 }
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218
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219 count = 0;
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220 while (rename(src, dest) == -1 && count < 2) {
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221 if (errno != EEXIST) {
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222 mail_storage_set_critical(storage,
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223 "rename(%s, %s) failed: %m",
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224 src, dest);
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225 return FALSE;
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226 }
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227
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228 /* ..dir already existed? delete it and try again */
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229 if (!unlink_directory(dest)) {
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230 mail_storage_set_critical(storage,
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231 "unlink_directory(%s) "
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232 "failed: %m", dest);
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233 return FALSE;
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234 }
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235 count++;
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236 }
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237
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238 if (!unlink_directory(dest)) {
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239 mail_storage_set_critical(storage, "unlink_directory(%s) "
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240 "failed: %m", dest);
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241 return FALSE;
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242 }
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243 return TRUE;
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244 }
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245
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246 static int move_inbox_data(MailStorage *storage, const char *newdir)
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247 {
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248 const char **tmp;
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249 char oldpath[1024], newpath[1024];
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250
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251 /* newpath points to the destination folder directory, which contains
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252 symlinks to real INBOX directories. unlink() the symlinks and
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253 move the real cur/ directory here. */
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254 for (tmp = maildirs; *tmp != NULL; tmp++) {
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255 i_snprintf(newpath, sizeof(newpath), "%s/%s", newdir, *tmp);
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256
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257 if (unlink(newpath) == -1 && errno != EEXIST) {
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258 mail_storage_set_error(storage, "unlink(%s) failed: "
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259 "%m", newpath);
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260 return FALSE;
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261 }
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262 }
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263
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264 i_snprintf(oldpath, sizeof(oldpath), "%s/cur", storage->dir);
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265 i_snprintf(newpath, sizeof(newpath), "%s/cur", newdir);
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266 if (rename(oldpath, newpath) != 0) {
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267 mail_storage_set_critical(storage, "rename(%s, %s) failed: %m",
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268 oldpath, newpath);
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269 return FALSE;
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270 }
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271
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272 /* create back the cur/ directory for INBOX */
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273 (void)mkdir(oldpath, CREATE_MODE);
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274 return TRUE;
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275 }
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276
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277 static int maildir_rename_mailbox(MailStorage *storage, const char *oldname,
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278 const char *newname)
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279 {
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280 char oldpath[1024], newpath[1024];
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281
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282 mail_storage_clear_error(storage);
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283
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284 if (strcasecmp(oldname, "INBOX") == 0)
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285 oldname = "INBOX";
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286
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287 /* NOTE: renaming INBOX works just fine with us, it's simply created
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288 the next time it's needed. Only problem with it is that it's not
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289 atomic operation but that can't be really helped. */
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290 i_snprintf(oldpath, sizeof(oldpath), "%s/.%s", storage->dir, oldname);
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291 i_snprintf(newpath, sizeof(newpath), "%s/.%s", storage->dir, newname);
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292 if (rename(oldpath, newpath) == 0) {
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293 if (strcmp(oldname, "INBOX") == 0)
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294 return move_inbox_data(storage, newpath);
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295 return TRUE;
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296 }
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297
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298 if (errno == EEXIST) {
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299 mail_storage_set_error(storage,
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300 "Target mailbox already exists");
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301 return FALSE;
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302 } else {
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303 mail_storage_set_critical(storage, "rename(%s, %s) failed: %m",
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304 oldpath, newpath);
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305 return FALSE;
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306 }
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307 }
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308
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309 static int maildir_get_mailbox_name_status(MailStorage *storage,
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310 const char *name,
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311 MailboxNameStatus *status)
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312 {
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313 struct stat st;
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314 char path[1024];
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315
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316 mail_storage_clear_error(storage);
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317
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318 if (strcasecmp(name, "INBOX") == 0)
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319 name = "INBOX";
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320
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321 if (!maildir_is_valid_name(storage, name)) {
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322 *status = MAILBOX_NAME_INVALID;
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323 return TRUE;
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324 }
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325
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326 i_snprintf(path, sizeof(path), "%s/.%s", storage->dir, name);
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327 if (stat(path, &st) == 0) {
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328 *status = MAILBOX_NAME_EXISTS;
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329 return TRUE;
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330 } else if (errno == ENOENT) {
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331 *status = MAILBOX_NAME_VALID;
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332 return TRUE;
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333 } else {
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334 mail_storage_set_critical(storage, "mailbox name status: "
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335 "stat(%s) failed: %m", path);
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336 return FALSE;
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337 }
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338 }
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339
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340 MailStorage maildir_storage = {
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341 "maildir", /* name */
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342
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343 '.', /* hierarchy_sep - can't be changed */
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344
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345 maildir_create,
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346 maildir_free,
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347 maildir_autodetect,
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348 maildir_open_mailbox,
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349 maildir_create_mailbox,
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350 maildir_delete_mailbox,
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351 maildir_rename_mailbox,
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352 maildir_find_mailboxes,
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353 subsfile_set_subscribed,
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354 maildir_find_subscribed,
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355 maildir_get_mailbox_name_status,
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356 mail_storage_get_last_error
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357 };
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358
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359 static Mailbox maildir_mailbox = {
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360 NULL, /* name */
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361 NULL, /* storage */
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362
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363 index_storage_close,
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364 index_storage_get_status,
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365 index_storage_sync,
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366 index_storage_expunge,
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367 index_storage_update_flags,
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368 maildir_storage_copy,
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369 index_storage_fetch,
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370 index_storage_search,
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371 maildir_storage_save,
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372 mail_storage_is_inconsistency_error
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373 };
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