Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/plugins/acl/acl-backend-vfile-acllist.c @ 9207:bf4f542ec6df HEAD
acl+mbox: Create also temp acllist file to control directory.
author | Timo Sirainen <tss@iki.fi> |
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date | Tue, 07 Jul 2009 22:37:42 -0400 |
parents | 4c8175452173 |
children | 00cd9aacd03c |
rev | line source |
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Updated copyright notices to include year 2009.
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1 /* Copyright (c) 2007-2009 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 "array.h" |
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5 #include "str.h" |
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6 #include "safe-mkstemp.h" |
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7 #include "istream.h" |
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8 #include "ostream.h" |
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9 #include "mail-namespace.h" |
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10 #include "mail-storage.h" |
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11 #include "acl-plugin.h" |
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12 #include "acl-cache.h" |
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13 #include "acl-lookup-dict.h" |
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14 #include "acl-backend-vfile.h" |
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15 |
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16 #include <stdio.h> |
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17 #include <unistd.h> |
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18 #include <fcntl.h> |
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19 #include <sys/stat.h> |
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20 |
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21 struct acl_mailbox_list_context_vfile { |
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22 struct acl_mailbox_list_context ctx; |
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23 |
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24 unsigned int idx; |
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25 }; |
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26 |
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27 static void |
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28 acllist_clear(struct acl_backend_vfile *backend, uoff_t file_size) |
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29 { |
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30 if (backend->acllist_pool == NULL) { |
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31 backend->acllist_pool = |
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32 pool_alloconly_create("vfile acllist", |
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33 I_MAX(file_size / 2, 128)); |
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34 i_array_init(&backend->acllist, I_MAX(16, file_size / 60)); |
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35 } else { |
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36 p_clear(backend->acllist_pool); |
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37 array_clear(&backend->acllist); |
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38 } |
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39 } |
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40 |
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41 static const char *acl_list_get_root_dir(struct acl_backend_vfile *backend) |
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42 { |
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43 struct mail_storage *storage; |
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44 const char *rootdir, *maildir; |
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45 bool is_file; |
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46 |
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47 rootdir = mailbox_list_get_path(backend->backend.list, NULL, |
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48 MAILBOX_LIST_PATH_TYPE_DIR); |
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49 |
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50 storage = mailbox_list_get_namespace(backend->backend.list)->storage; |
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51 (void)mail_storage_get_mailbox_path(storage, "", &is_file); |
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52 if (is_file) { |
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53 maildir = mailbox_list_get_path(backend->backend.list, NULL, |
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54 MAILBOX_LIST_PATH_TYPE_MAILBOX); |
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55 if (strcmp(maildir, rootdir) == 0) { |
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56 /* dovecot-acl-list would show up as a mailbox if we |
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57 created it to root dir. since we don't really have |
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58 any other good alternatives, place it to control |
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59 dir */ |
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60 rootdir = mailbox_list_get_path(backend->backend.list, |
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61 NULL, MAILBOX_LIST_PATH_TYPE_CONTROL); |
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62 } |
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63 } |
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64 return rootdir; |
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65 } |
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66 |
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67 static const char *acl_list_get_path(struct acl_backend_vfile *backend) |
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68 { |
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69 return t_strconcat(acl_list_get_root_dir(backend), |
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70 "/"ACLLIST_FILENAME, NULL); |
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71 } |
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72 |
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73 static int acl_backend_vfile_acllist_read(struct acl_backend_vfile *backend) |
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74 { |
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75 struct acl_backend_vfile_acllist acllist; |
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76 struct istream *input; |
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77 struct stat st; |
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78 const char *path, *line, *p; |
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79 int fd, ret = 0; |
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80 |
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81 backend->acllist_last_check = ioloop_time; |
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82 |
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83 path = acl_list_get_path(backend); |
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84 if (path == NULL) { |
8212 | 85 /* we're never going to build acllist for this namespace. */ |
86 i_array_init(&backend->acllist, 1); | |
87 return 0; | |
88 } | |
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89 |
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90 if (backend->acllist_mtime != 0) { |
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91 /* see if the file's mtime has changed */ |
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92 if (stat(path, &st) < 0) { |
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93 if (errno == ENOENT) |
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94 backend->acllist_mtime = 0; |
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95 else |
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96 i_error("stat(%s) failed: %m", path); |
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97 return -1; |
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98 } |
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99 if (st.st_mtime == backend->acllist_mtime) |
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100 return 0; |
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101 } |
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102 |
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103 fd = open(path, O_RDONLY); |
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104 if (fd == -1) { |
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105 if (errno == ENOENT) { |
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106 backend->acllist_mtime = 0; |
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107 return -1; |
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108 } |
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109 i_error("open(%s) failed: %m", path); |
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110 return -1; |
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111 } |
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112 if (fstat(fd, &st) < 0) { |
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113 i_error("fstat(%s) failed: %m", path); |
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114 (void)close(fd); |
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115 return -1; |
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116 } |
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117 backend->acllist_mtime = st.st_mtime; |
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118 acllist_clear(backend, st.st_size); |
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119 |
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120 input = i_stream_create_fd(fd, (size_t)-1, FALSE); |
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121 while ((line = i_stream_read_next_line(input)) != NULL) { |
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122 acllist.mtime = 0; |
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123 for (p = line; *p >= '0' && *p <= '9'; p++) |
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124 acllist.mtime = acllist.mtime * 10 + (*p - '0'); |
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125 |
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126 if (p == line || *p != ' ' || p[1] == '\0') { |
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127 i_error("Broken acllist file: %s", path); |
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128 if (unlink(path) < 0 && errno != ENOENT) |
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129 i_error("unlink(%s) failed: %m", path); |
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130 return -1; |
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131 } |
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132 acllist.name = p_strdup(backend->acllist_pool, p + 1); |
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133 array_append(&backend->acllist, &acllist, 1); |
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134 } |
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135 if (input->stream_errno != 0) |
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136 ret = -1; |
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137 i_stream_destroy(&input); |
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138 |
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139 if (close(fd) < 0) |
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140 i_error("close(%s) failed: %m", path); |
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141 return ret; |
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142 } |
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143 |
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144 void acl_backend_vfile_acllist_refresh(struct acl_backend_vfile *backend) |
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145 { |
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146 i_assert(!backend->iterating_acllist); |
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147 |
5983 | 148 if (backend->acllist_last_check + |
149 (time_t)backend->cache_secs > ioloop_time) | |
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150 return; |
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151 |
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152 if (acl_backend_vfile_acllist_read(backend) < 0) { |
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153 acllist_clear(backend, 0); |
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154 if (!backend->rebuilding_acllist) |
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155 (void)acl_backend_vfile_acllist_rebuild(backend); |
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156 } |
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157 } |
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158 |
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159 static int |
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160 acllist_append(struct acl_backend_vfile *backend, struct ostream *output, |
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161 struct mail_storage *storage, const char *name) |
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162 { |
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163 struct acl_object *aclobj; |
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164 struct acl_object_list_iter *iter; |
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165 struct acl_rights rights; |
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166 struct acl_backend_vfile_acllist acllist; |
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167 int ret; |
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168 |
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169 acl_cache_flush(backend->backend.cache, name); |
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170 aclobj = acl_object_init_from_name(&backend->backend, storage, name); |
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171 |
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172 iter = acl_object_list_init(aclobj); |
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173 while ((ret = acl_object_list_next(iter, &rights)) > 0) { |
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174 if (acl_rights_has_nonowner_lookup_changes(&rights)) |
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175 break; |
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176 } |
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177 acl_object_list_deinit(&iter); |
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178 |
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179 if (acl_backend_vfile_object_get_mtime(aclobj, &acllist.mtime) < 0) |
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180 ret = -1; |
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181 |
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182 if (ret > 0) { |
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183 acllist.name = p_strdup(backend->acllist_pool, name); |
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184 array_append(&backend->acllist, &acllist, 1); |
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185 |
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186 T_BEGIN { |
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187 const char *line; |
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188 line = t_strdup_printf("%s %s\n", |
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189 dec2str(acllist.mtime), name); |
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190 o_stream_send_str(output, line); |
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191 } T_END; |
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192 } |
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193 acl_object_deinit(&aclobj); |
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194 return ret < 0 ? -1 : 0; |
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195 } |
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196 |
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197 static int |
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198 acl_backend_vfile_acllist_try_rebuild(struct acl_backend_vfile *backend) |
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199 { |
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200 struct mailbox_list *list = backend->backend.list; |
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201 struct mail_namespace *ns; |
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202 struct mailbox_list_iterate_context *iter; |
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203 const struct mailbox_info *info; |
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204 const char *rootdir, *origin, *acllist_path; |
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205 struct ostream *output; |
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206 struct stat st; |
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207 string_t *path; |
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208 mode_t mode; |
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209 gid_t gid; |
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210 int fd, ret; |
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211 |
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212 i_assert(!backend->rebuilding_acllist); |
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213 |
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214 rootdir = acl_list_get_root_dir(backend); |
8212 | 215 if (rootdir == NULL) |
216 return 0; | |
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217 |
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218 ns = mailbox_list_get_namespace(list); |
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219 if ((ns->flags & NAMESPACE_FLAG_UNUSABLE) != 0) { |
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220 /* we can't write anything here */ |
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221 return 0; |
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222 } |
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223 |
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224 path = t_str_new(256); |
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225 str_printfa(path, "%s/%s", rootdir, mailbox_list_get_temp_prefix(list)); |
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226 |
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227 /* Build it into a temporary file and rename() over. There's no need |
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228 to use locking, because even if multiple processes are rebuilding |
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229 the file at the same time the result should be the same. */ |
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230 mailbox_list_get_permissions(list, NULL, &mode, &gid, &origin); |
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231 fd = safe_mkstemp_group(path, mode, gid, origin); |
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232 if (fd == -1 && errno == ENOENT) { |
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233 if (mailbox_list_create_parent_dir(backend->backend.list, NULL, |
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234 str_c(path)) < 0) |
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235 return -1; |
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236 fd = safe_mkstemp_group(path, mode, gid, origin); |
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237 } |
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238 if (fd == -1) { |
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239 if (errno == EACCES) { |
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240 /* Ignore silently if we can't create it */ |
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241 return 0; |
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242 } |
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243 i_error("dovecot-acl-list creation failed: " |
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244 "safe_mkstemp(%s) failed: %m", str_c(path)); |
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245 return -1; |
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246 } |
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247 output = o_stream_create_fd_file(fd, 0, FALSE); |
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248 |
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249 ret = 0; |
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250 acllist_clear(backend, 0); |
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251 |
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252 backend->rebuilding_acllist = TRUE; |
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253 iter = mailbox_list_iter_init(list, "*", MAILBOX_LIST_ITER_RAW_LIST | |
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254 MAILBOX_LIST_ITER_RETURN_NO_FLAGS); |
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255 while ((info = mailbox_list_iter_next(iter)) != NULL) { |
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256 if (acllist_append(backend, output, ns->storage, |
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257 info->name) < 0) { |
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258 ret = -1; |
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259 break; |
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260 } |
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261 } |
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262 |
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263 if (output->stream_errno != 0) { |
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264 i_error("write(%s) failed: %m", str_c(path)); |
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265 ret = -1; |
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266 } |
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267 if (mailbox_list_iter_deinit(&iter) < 0) |
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268 ret = -1; |
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269 o_stream_destroy(&output); |
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270 |
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271 if (ret == 0) { |
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272 if (fstat(fd, &st) < 0) { |
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273 i_error("fstat(%s) failed: %m", str_c(path)); |
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274 ret = -1; |
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275 } |
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276 } |
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277 if (close(fd) < 0) { |
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278 i_error("close(%s) failed: %m", str_c(path)); |
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279 ret = -1; |
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280 } |
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281 |
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282 if (ret == 0) { |
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283 acllist_path = acl_list_get_path(backend); |
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284 if (rename(str_c(path), acllist_path) < 0) { |
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285 i_error("rename(%s, %s) failed: %m", |
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286 str_c(path), acllist_path); |
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287 ret = -1; |
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288 } |
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289 } |
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290 if (ret == 0) { |
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291 struct acl_user *auser = ACL_USER_CONTEXT(ns->user); |
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292 |
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293 backend->acllist_mtime = st.st_mtime; |
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294 backend->acllist_last_check = ioloop_time; |
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295 /* FIXME: dict reubild is expensive, try to avoid it */ |
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296 (void)acl_lookup_dict_rebuild(auser->acl_lookup_dict); |
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297 } else { |
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298 acllist_clear(backend, 0); |
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299 if (unlink(str_c(path)) < 0 && errno != ENOENT) |
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300 i_error("unlink(%s) failed: %m", str_c(path)); |
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301 } |
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302 backend->rebuilding_acllist = FALSE; |
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303 return ret; |
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304 } |
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305 |
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306 int acl_backend_vfile_acllist_rebuild(struct acl_backend_vfile *backend) |
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307 { |
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308 const char *acllist_path; |
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309 |
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310 if (acl_backend_vfile_acllist_try_rebuild(backend) == 0) |
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311 return 0; |
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312 else { |
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313 /* delete it to make sure it gets rebuilt later */ |
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314 acllist_path = acl_list_get_path(backend); |
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315 if (unlink(acllist_path) < 0 && errno != ENOENT) |
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316 i_error("unlink(%s) failed: %m", acllist_path); |
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317 return -1; |
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318 } |
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319 } |
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320 |
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321 static const struct acl_backend_vfile_acllist * |
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322 acl_backend_vfile_acllist_find(struct acl_backend_vfile *backend, |
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323 const char *name) |
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324 { |
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325 const struct acl_backend_vfile_acllist *acllist; |
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326 unsigned int i, count; |
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327 |
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328 acllist = array_get(&backend->acllist, &count); |
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329 for (i = 0; i < count; i++) { |
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330 if (strcmp(acllist[i].name, name) == 0) |
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331 return &acllist[i]; |
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332 } |
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333 return NULL; |
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334 } |
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335 |
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336 void acl_backend_vfile_acllist_verify(struct acl_backend_vfile *backend, |
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337 const char *name, time_t mtime) |
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338 { |
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339 const struct acl_backend_vfile_acllist *acllist; |
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340 |
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341 if (backend->rebuilding_acllist || backend->iterating_acllist) |
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342 return; |
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343 |
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344 acl_backend_vfile_acllist_refresh(backend); |
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345 acllist = acl_backend_vfile_acllist_find(backend, name); |
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346 if (acllist != NULL && acllist->mtime != mtime) |
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347 (void)acl_backend_vfile_acllist_rebuild(backend); |
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348 } |
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349 |
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350 struct acl_mailbox_list_context * |
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351 acl_backend_vfile_nonowner_iter_init(struct acl_backend *_backend) |
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352 { |
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353 struct acl_backend_vfile *backend = |
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354 (struct acl_backend_vfile *)_backend; |
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355 struct acl_mailbox_list_context_vfile *ctx; |
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356 |
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357 acl_backend_vfile_acllist_refresh(backend); |
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358 |
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359 ctx = i_new(struct acl_mailbox_list_context_vfile, 1); |
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360 ctx->ctx.backend = _backend; |
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361 backend->iterating_acllist = TRUE; |
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362 return &ctx->ctx; |
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363 } |
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364 |
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365 int acl_backend_vfile_nonowner_iter_next(struct acl_mailbox_list_context *_ctx, |
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366 const char **name_r) |
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367 { |
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368 struct acl_mailbox_list_context_vfile *ctx = |
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369 (struct acl_mailbox_list_context_vfile *)_ctx; |
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370 struct acl_backend_vfile *backend = |
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371 (struct acl_backend_vfile *)_ctx->backend; |
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372 const struct acl_backend_vfile_acllist *acllist; |
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373 unsigned int count; |
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374 |
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375 acllist = array_get(&backend->acllist, &count); |
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376 if (ctx->idx == count) |
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377 return 0; |
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378 |
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379 *name_r = acllist[ctx->idx++].name; |
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380 return 1; |
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381 } |
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382 |
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383 void |
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384 acl_backend_vfile_nonowner_iter_deinit(struct acl_mailbox_list_context *ctx) |
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385 { |
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386 struct acl_backend_vfile *backend = |
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387 (struct acl_backend_vfile *)ctx->backend; |
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388 |
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389 backend->iterating_acllist = FALSE; |
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390 i_free(ctx); |
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391 } |