Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/plugins/acl/acl-backend-vfile-acllist.c @ 9205:4c8175452173 HEAD
acl+mbox: Create dovecot-acl-list to control dir.
author | Timo Sirainen <tss@iki.fi> |
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date | Tue, 07 Jul 2009 22:27:55 -0400 |
parents | 2bbf175bb6d3 |
children | bf4f542ec6df |
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_path(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 t_strconcat(rootdir, "/"ACLLIST_FILENAME, NULL); |
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65 } |
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66 |
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67 static int acl_backend_vfile_acllist_read(struct acl_backend_vfile *backend) |
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68 { |
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69 struct acl_backend_vfile_acllist acllist; |
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70 struct istream *input; |
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71 struct stat st; |
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72 const char *path, *line, *p; |
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73 int fd, ret = 0; |
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74 |
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75 backend->acllist_last_check = ioloop_time; |
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76 |
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77 path = acl_list_get_path(backend); |
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78 if (path == NULL) { |
8212 | 79 /* we're never going to build acllist for this namespace. */ |
80 i_array_init(&backend->acllist, 1); | |
81 return 0; | |
82 } | |
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83 |
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84 if (backend->acllist_mtime != 0) { |
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85 /* see if the file's mtime has changed */ |
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86 if (stat(path, &st) < 0) { |
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87 if (errno == ENOENT) |
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88 backend->acllist_mtime = 0; |
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89 else |
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90 i_error("stat(%s) failed: %m", path); |
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91 return -1; |
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92 } |
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93 if (st.st_mtime == backend->acllist_mtime) |
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94 return 0; |
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95 } |
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96 |
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97 fd = open(path, O_RDONLY); |
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98 if (fd == -1) { |
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99 if (errno == ENOENT) { |
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100 backend->acllist_mtime = 0; |
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101 return -1; |
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102 } |
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103 i_error("open(%s) failed: %m", path); |
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104 return -1; |
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105 } |
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106 if (fstat(fd, &st) < 0) { |
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107 i_error("fstat(%s) failed: %m", path); |
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108 (void)close(fd); |
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109 return -1; |
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110 } |
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111 backend->acllist_mtime = st.st_mtime; |
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112 acllist_clear(backend, st.st_size); |
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113 |
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114 input = i_stream_create_fd(fd, (size_t)-1, FALSE); |
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115 while ((line = i_stream_read_next_line(input)) != NULL) { |
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116 acllist.mtime = 0; |
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117 for (p = line; *p >= '0' && *p <= '9'; p++) |
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118 acllist.mtime = acllist.mtime * 10 + (*p - '0'); |
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119 |
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120 if (p == line || *p != ' ' || p[1] == '\0') { |
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121 i_error("Broken acllist file: %s", path); |
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122 if (unlink(path) < 0 && errno != ENOENT) |
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123 i_error("unlink(%s) failed: %m", path); |
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124 return -1; |
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125 } |
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126 acllist.name = p_strdup(backend->acllist_pool, p + 1); |
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127 array_append(&backend->acllist, &acllist, 1); |
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128 } |
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129 if (input->stream_errno != 0) |
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130 ret = -1; |
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131 i_stream_destroy(&input); |
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132 |
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133 if (close(fd) < 0) |
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134 i_error("close(%s) failed: %m", path); |
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135 return ret; |
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136 } |
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137 |
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138 void acl_backend_vfile_acllist_refresh(struct acl_backend_vfile *backend) |
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139 { |
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140 i_assert(!backend->iterating_acllist); |
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141 |
5983 | 142 if (backend->acllist_last_check + |
143 (time_t)backend->cache_secs > ioloop_time) | |
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144 return; |
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145 |
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146 if (acl_backend_vfile_acllist_read(backend) < 0) { |
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147 acllist_clear(backend, 0); |
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148 if (!backend->rebuilding_acllist) |
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149 (void)acl_backend_vfile_acllist_rebuild(backend); |
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150 } |
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151 } |
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152 |
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153 static int |
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154 acllist_append(struct acl_backend_vfile *backend, struct ostream *output, |
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155 struct mail_storage *storage, const char *name) |
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156 { |
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157 struct acl_object *aclobj; |
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158 struct acl_object_list_iter *iter; |
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159 struct acl_rights rights; |
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160 struct acl_backend_vfile_acllist acllist; |
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161 int ret; |
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162 |
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163 acl_cache_flush(backend->backend.cache, name); |
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164 aclobj = acl_object_init_from_name(&backend->backend, storage, name); |
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165 |
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166 iter = acl_object_list_init(aclobj); |
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167 while ((ret = acl_object_list_next(iter, &rights)) > 0) { |
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168 if (acl_rights_has_nonowner_lookup_changes(&rights)) |
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169 break; |
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170 } |
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171 acl_object_list_deinit(&iter); |
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172 |
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173 if (acl_backend_vfile_object_get_mtime(aclobj, &acllist.mtime) < 0) |
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174 ret = -1; |
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175 |
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176 if (ret > 0) { |
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177 acllist.name = p_strdup(backend->acllist_pool, name); |
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178 array_append(&backend->acllist, &acllist, 1); |
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179 |
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180 T_BEGIN { |
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181 const char *line; |
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182 line = t_strdup_printf("%s %s\n", |
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183 dec2str(acllist.mtime), name); |
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184 o_stream_send_str(output, line); |
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185 } T_END; |
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186 } |
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187 acl_object_deinit(&aclobj); |
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188 return ret < 0 ? -1 : 0; |
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189 } |
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190 |
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191 static int |
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192 acllist_rename(struct acl_backend_vfile *backend, const char *temp_path) |
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193 { |
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194 const char *acllist_path; |
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195 |
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196 acllist_path = acl_list_get_path(backend); |
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197 if (rename(temp_path, acllist_path) == 0) |
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198 return 0; |
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199 |
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200 if (errno == ENOENT) { |
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201 if (mailbox_list_create_parent_dir(backend->backend.list, NULL, |
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202 acllist_path) < 0) |
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203 return -1; |
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204 if (rename(temp_path, acllist_path) == 0) |
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205 return 0; |
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206 } |
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207 |
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208 i_error("rename(%s, %s) failed: %m", temp_path, acllist_path); |
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209 return -1; |
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210 } |
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211 |
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212 static int |
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213 acl_backend_vfile_acllist_try_rebuild(struct acl_backend_vfile *backend) |
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214 { |
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215 struct mailbox_list *list = backend->backend.list; |
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216 struct mail_namespace *ns; |
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217 struct mailbox_list_iterate_context *iter; |
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218 const struct mailbox_info *info; |
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219 const char *rootdir, *origin; |
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220 struct ostream *output; |
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221 struct stat st; |
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222 string_t *path; |
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223 mode_t mode; |
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224 gid_t gid; |
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225 int fd, ret; |
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226 |
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227 i_assert(!backend->rebuilding_acllist); |
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228 |
8212 | 229 rootdir = mailbox_list_get_path(list, NULL, |
230 MAILBOX_LIST_PATH_TYPE_DIR); | |
231 if (rootdir == NULL) | |
232 return 0; | |
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233 |
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234 ns = mailbox_list_get_namespace(list); |
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235 if ((ns->flags & NAMESPACE_FLAG_UNUSABLE) != 0) { |
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236 /* we can't write anything here */ |
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237 return 0; |
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238 } |
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239 |
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240 path = t_str_new(256); |
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241 str_printfa(path, "%s/%s", rootdir, mailbox_list_get_temp_prefix(list)); |
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242 |
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243 /* Build it into a temporary file and rename() over. There's no need |
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244 to use locking, because even if multiple processes are rebuilding |
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245 the file at the same time the result should be the same. */ |
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246 mailbox_list_get_permissions(list, NULL, &mode, &gid, &origin); |
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247 fd = safe_mkstemp_group(path, mode, gid, origin); |
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248 if (fd == -1) { |
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249 if (errno == EACCES) { |
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250 /* Ignore silently if we can't create it */ |
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251 return 0; |
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252 } |
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253 i_error("dovecot-acl-list creation failed: " |
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254 "safe_mkstemp(%s) failed: %m", str_c(path)); |
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255 return -1; |
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256 } |
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257 output = o_stream_create_fd_file(fd, 0, FALSE); |
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258 |
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259 ret = 0; |
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260 acllist_clear(backend, 0); |
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261 |
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262 backend->rebuilding_acllist = TRUE; |
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263 iter = mailbox_list_iter_init(list, "*", MAILBOX_LIST_ITER_RAW_LIST | |
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264 MAILBOX_LIST_ITER_RETURN_NO_FLAGS); |
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265 while ((info = mailbox_list_iter_next(iter)) != NULL) { |
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266 if (acllist_append(backend, output, ns->storage, |
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267 info->name) < 0) { |
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268 ret = -1; |
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269 break; |
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270 } |
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271 } |
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272 |
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273 if (output->stream_errno != 0) { |
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274 i_error("write(%s) failed: %m", str_c(path)); |
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275 ret = -1; |
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276 } |
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277 if (mailbox_list_iter_deinit(&iter) < 0) |
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278 ret = -1; |
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279 o_stream_destroy(&output); |
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280 |
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281 if (ret == 0) { |
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282 if (fstat(fd, &st) < 0) { |
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283 i_error("fstat(%s) failed: %m", str_c(path)); |
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284 ret = -1; |
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285 } |
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286 } |
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287 if (close(fd) < 0) { |
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288 i_error("close(%s) failed: %m", str_c(path)); |
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289 ret = -1; |
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290 } |
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291 |
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292 if (ret == 0) |
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293 ret = acllist_rename(backend, str_c(path)); |
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294 if (ret == 0) { |
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295 struct acl_user *auser = ACL_USER_CONTEXT(ns->user); |
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296 |
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297 backend->acllist_mtime = st.st_mtime; |
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298 backend->acllist_last_check = ioloop_time; |
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299 /* FIXME: dict reubild is expensive, try to avoid it */ |
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300 (void)acl_lookup_dict_rebuild(auser->acl_lookup_dict); |
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301 } else { |
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302 acllist_clear(backend, 0); |
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303 if (unlink(str_c(path)) < 0 && errno != ENOENT) |
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304 i_error("unlink(%s) failed: %m", str_c(path)); |
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305 } |
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306 backend->rebuilding_acllist = FALSE; |
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307 return ret; |
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308 } |
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309 |
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310 int acl_backend_vfile_acllist_rebuild(struct acl_backend_vfile *backend) |
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311 { |
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312 const char *acllist_path; |
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313 |
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314 if (acl_backend_vfile_acllist_try_rebuild(backend) == 0) |
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315 return 0; |
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316 else { |
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317 /* delete it to make sure it gets rebuilt later */ |
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318 acllist_path = acl_list_get_path(backend); |
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319 if (unlink(acllist_path) < 0 && errno != ENOENT) |
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320 i_error("unlink(%s) failed: %m", acllist_path); |
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321 return -1; |
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322 } |
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323 } |
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324 |
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325 static const struct acl_backend_vfile_acllist * |
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326 acl_backend_vfile_acllist_find(struct acl_backend_vfile *backend, |
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327 const char *name) |
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328 { |
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329 const struct acl_backend_vfile_acllist *acllist; |
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330 unsigned int i, count; |
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331 |
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332 acllist = array_get(&backend->acllist, &count); |
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333 for (i = 0; i < count; i++) { |
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334 if (strcmp(acllist[i].name, name) == 0) |
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335 return &acllist[i]; |
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336 } |
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337 return NULL; |
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338 } |
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339 |
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340 void acl_backend_vfile_acllist_verify(struct acl_backend_vfile *backend, |
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341 const char *name, time_t mtime) |
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342 { |
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343 const struct acl_backend_vfile_acllist *acllist; |
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344 |
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345 if (backend->rebuilding_acllist || backend->iterating_acllist) |
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346 return; |
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347 |
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348 acl_backend_vfile_acllist_refresh(backend); |
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349 acllist = acl_backend_vfile_acllist_find(backend, name); |
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350 if (acllist != NULL && acllist->mtime != mtime) |
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351 (void)acl_backend_vfile_acllist_rebuild(backend); |
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352 } |
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353 |
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354 struct acl_mailbox_list_context * |
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355 acl_backend_vfile_nonowner_iter_init(struct acl_backend *_backend) |
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356 { |
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357 struct acl_backend_vfile *backend = |
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358 (struct acl_backend_vfile *)_backend; |
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359 struct acl_mailbox_list_context_vfile *ctx; |
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360 |
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361 acl_backend_vfile_acllist_refresh(backend); |
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362 |
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363 ctx = i_new(struct acl_mailbox_list_context_vfile, 1); |
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364 ctx->ctx.backend = _backend; |
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365 backend->iterating_acllist = TRUE; |
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366 return &ctx->ctx; |
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367 } |
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368 |
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369 int acl_backend_vfile_nonowner_iter_next(struct acl_mailbox_list_context *_ctx, |
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370 const char **name_r) |
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371 { |
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372 struct acl_mailbox_list_context_vfile *ctx = |
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373 (struct acl_mailbox_list_context_vfile *)_ctx; |
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374 struct acl_backend_vfile *backend = |
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375 (struct acl_backend_vfile *)_ctx->backend; |
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376 const struct acl_backend_vfile_acllist *acllist; |
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377 unsigned int count; |
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378 |
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379 acllist = array_get(&backend->acllist, &count); |
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380 if (ctx->idx == count) |
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381 return 0; |
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382 |
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383 *name_r = acllist[ctx->idx++].name; |
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384 return 1; |
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385 } |
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386 |
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387 void |
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388 acl_backend_vfile_nonowner_iter_deinit(struct acl_mailbox_list_context *ctx) |
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389 { |
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390 struct acl_backend_vfile *backend = |
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391 (struct acl_backend_vfile *)ctx->backend; |
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392 |
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393 backend->iterating_acllist = FALSE; |
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394 i_free(ctx); |
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395 } |