Sat, 25 Mar 2023 17:18:51 +0100
fix PUT could potentially return a wrong status code
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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2019 Olaf Wintermann. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | #include <stdio.h> |
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30 | #include <stdlib.h> |
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31 | #include <string.h> |
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32 | |
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33 | #include <cx/string.h> |
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34 | #include <cx/utils.h> |
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35 | #include <cx/map.h> |
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36 | #include <cx/hash_map.h> |
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37 | |
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38 | #include "requestparser.h" |
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39 | #include "webdav.h" |
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40 | |
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41 | #include "../util/pool.h" |
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42 | |
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43 | #define xstreq(a, b) !strcmp((const char*)a, (const char*)b) |
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44 | |
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45 | void proplist_free(pool_handle_t *pool, WebdavPList *list) { |
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46 | while(list) { |
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47 | WebdavPList *next = list->next; |
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48 | pool_free(pool, list); |
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49 | list = next; |
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50 | } |
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51 | } |
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52 | |
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53 | WebdavProperty* prop_create( |
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54 | pool_handle_t *pool, |
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55 | WSNamespace *ns, |
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56 | const char *name) |
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57 | { |
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58 | WebdavProperty *prop = pool_malloc(pool, sizeof(WebdavProperty)); |
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59 | memset(prop, 0, sizeof(WebdavProperty)); |
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60 | prop->lang = NULL; |
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61 | prop->name = (char*)name; |
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62 | prop->namespace = ns; |
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63 | return prop; |
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64 | } |
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65 | |
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66 | static int parse_prop( |
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67 | Session *sn, |
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68 | xmlNode *node, |
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69 | CxMap *propmap, |
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70 | WebdavPList **plist_begin, |
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71 | WebdavPList **plist_end, |
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72 | size_t *propcount, |
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73 | int proppatch, |
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74 | int *error) |
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75 | { |
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76 | xmlNode *pnode = node->children; |
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77 | for(;pnode;pnode=pnode->next) { |
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78 | if(pnode->type != XML_ELEMENT_NODE) { |
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79 | continue; |
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80 | } |
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81 | |
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82 | const char* ns = (const char*)pnode->ns->href; |
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83 | const char* name = (const char*)pnode->name; |
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84 | |
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85 | // check for prop duplicates |
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86 | CxHashKey k = webdav_property_key((const char*)ns, (const char*)name); |
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87 | if(!k.data.bytes) { |
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88 | *error = proppatch ? PROPPATCH_PARSER_OOM : PROPFIND_PARSER_OOM; |
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89 | return 1; |
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90 | } |
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91 | void *c = cxMapGet(propmap, k); |
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92 | if(!c) { |
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93 | if(cxMapPut(propmap, k, (void*)1)) { |
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94 | *error = proppatch ? PROPPATCH_PARSER_OOM : PROPFIND_PARSER_OOM; |
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95 | } |
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96 | |
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97 | // no duplicate |
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98 | // create property elment and add it to the list |
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99 | WebdavProperty *prop = prop_create(sn->pool, pnode->ns, name); |
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100 | if(proppatch) { |
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101 | prop->value.node = pnode->children; |
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102 | prop->vtype = WS_VALUE_XML_NODE; |
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103 | } |
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104 | if(prop) { |
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105 | if(webdav_plist_add(sn->pool, plist_begin, plist_end, prop)) { |
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106 | *error = proppatch ? |
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107 | PROPPATCH_PARSER_OOM : PROPFIND_PARSER_OOM; |
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108 | } |
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109 | (*propcount)++; |
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110 | } else { |
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111 | *error = proppatch ? PROPPATCH_PARSER_OOM : PROPFIND_PARSER_OOM; |
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112 | } |
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113 | } else if(proppatch) { |
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114 | *error = PROPPATCH_PARSER_DUPLICATE; |
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115 | } |
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116 | |
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117 | free((void*)k.data.str); |
211
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118 | if(*error) { |
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119 | return 1; |
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120 | } |
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121 | } |
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122 | return 0; |
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123 | } |
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124 | |
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125 | WebdavPropfindRequest* propfind_parse( |
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126 | Session *sn, |
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127 | Request *rq, |
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128 | const char *buf, |
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129 | size_t buflen, |
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130 | int *error) |
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131 | { |
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132 | xmlDoc *doc = xmlReadMemory(buf, buflen, NULL, NULL, 0); |
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133 | if(!doc) { |
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134 | *error = PROPFIND_PARSER_INVALID_REQUEST; |
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135 | return NULL; |
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136 | } |
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137 | |
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138 | // ret vars |
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139 | *error = 0; |
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140 | |
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141 | WSBool allprop = FALSE; |
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142 | WSBool propname = FALSE; |
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143 | WebdavPList *plist_begin = NULL; |
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144 | WebdavPList *plist_end = NULL; |
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145 | size_t propcount = 0; |
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146 | int depth = webdav_getdepth(rq); |
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147 | |
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148 | xmlNode *root = xmlDocGetRootElement(doc); |
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149 | xmlNode *node = root->children; |
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150 | |
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151 | // check if the root element is DAV:propfind |
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152 | if( |
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153 | !(root->ns |
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154 | && xstreq(root->ns->href, "DAV:") |
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155 | && xstreq(root->name, "propfind"))) |
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156 | { |
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157 | *error = PROPFIND_PARSER_NO_PROPFIND; |
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158 | xmlFreeDoc(doc); |
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159 | return NULL; |
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160 | } |
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161 | |
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162 | CxAllocator *a = pool_allocator(sn->pool); |
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163 | CxMap *propmap = cxHashMapCreate(a, 32); // value: intptr_t |
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164 | if(!propmap) { |
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165 | *error = PROPFIND_PARSER_OOM; |
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166 | xmlFreeDoc(doc); |
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167 | return NULL; |
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168 | } |
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169 | |
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170 | int ret = 0; |
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171 | while(node && !ret) { |
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172 | if(node->type == XML_ELEMENT_NODE) { |
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173 | if(xstreq(node->ns->href, "DAV:") && !allprop && !propname) { |
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174 | // a propfind request can contain a prop element |
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175 | // with specified properties or the allprop or propname |
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176 | // element |
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177 | if(xstreq(node->name, "prop")) { |
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178 | ret = parse_prop( |
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179 | sn, |
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180 | node, |
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181 | propmap, |
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182 | &plist_begin, |
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183 | &plist_end, |
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184 | &propcount, |
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185 | 0, // proppatch = false |
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186 | error); |
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187 | } else if(xstreq(node->name, "allprop")) { |
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188 | allprop = TRUE; |
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189 | } else if(xstreq(node->name, "propname")) { |
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190 | propname = TRUE; |
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191 | } |
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192 | } |
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193 | } |
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194 | node = node->next; |
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195 | } |
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196 | |
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197 | cxMapDestroy(propmap); // no allocated content must be freed |
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198 | |
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199 | if(ret) { |
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200 | // parse_prop failed |
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201 | // in this case, error is already set |
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202 | xmlFreeDoc(doc); |
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203 | return NULL; |
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204 | } |
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205 | |
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206 | if(!allprop && !propname && propcount == 0) { |
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207 | *error = PROPFIND_PARSER_NO_PROPERTIES; |
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208 | xmlFreeDoc(doc); |
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209 | return NULL; |
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210 | } |
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211 | |
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212 | WebdavPropfindRequest *request = pool_malloc( |
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213 | sn->pool, |
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214 | sizeof(WebdavPropfindRequest)); |
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215 | if(!request) { |
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216 | *error = PROPFIND_PARSER_OOM; |
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217 | xmlFreeDoc(doc); |
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218 | return NULL; |
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219 | } |
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220 | request->sn = sn; |
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221 | request->rq = rq; |
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222 | request->properties = NULL; |
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223 | request->propcount = 0; |
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224 | request->depth = depth; |
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225 | request->doc = doc; |
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226 | if(allprop) { |
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227 | request->allprop = TRUE; |
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228 | request->propname = FALSE; // we cannot have allprop and propname |
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229 | } else if(propname) { |
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230 | request->allprop = FALSE; |
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231 | request->propname = TRUE; |
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232 | } else { |
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233 | request->allprop = FALSE; |
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234 | request->propname = FALSE; |
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235 | request->properties = plist_begin; |
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236 | request->propcount = propcount; |
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237 | } |
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238 | |
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239 | if(!request->properties && plist_begin) { |
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240 | proplist_free(sn->pool, plist_begin); |
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241 | } |
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242 | return request; |
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243 | } |
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244 | |
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245 | WebdavProppatchRequest* proppatch_parse( |
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246 | Session *sn, |
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247 | Request *rq, |
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248 | const char *buf, |
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249 | size_t buflen, |
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250 | int *error) |
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251 | { |
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252 | return webdav_parse_set( |
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253 | sn, rq, buf, buflen, "DAV:", "propertyupdate", TRUE, error); |
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254 | } |
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255 | |
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256 | static xmlNode* find_child(xmlNode *node, const char *name) { |
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257 | xmlNode *c = node->children; |
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258 | while(c) { |
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259 | if(c->ns) { |
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260 | if(xstreq(c->ns->href, "DAV:") && xstreq(c->name, name)) { |
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261 | return c; |
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262 | } |
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263 | } |
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264 | c = c->next; |
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265 | } |
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266 | return NULL; |
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267 | } |
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268 | |
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269 | WebdavProppatchRequest* webdav_parse_set( |
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270 | Session *sn, |
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271 | Request *rq, |
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272 | const char *buf, |
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273 | size_t buflen, |
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274 | const char *rootns, |
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275 | const char *rootname, |
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276 | WSBool allowremove, |
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277 | int *error) |
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278 | { |
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279 | xmlDoc *doc = xmlReadMemory(buf, buflen, NULL, NULL, 0); |
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280 | if(!doc) { |
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281 | *error = PROPPATCH_PARSER_INVALID_REQUEST; |
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282 | return NULL; |
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283 | } |
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284 | |
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285 | xmlNode *root = xmlDocGetRootElement(doc); |
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286 | xmlNode *node = root->children; |
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287 | |
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288 | // check if the root element is correct |
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289 | if( |
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290 | !(root->ns |
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291 | && xstreq(root->ns->href, rootns) |
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292 | && xstreq(root->name, rootname))) |
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293 | { |
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294 | *error = PROPPATCH_PARSER_NO_PROPERTYUPDATE; |
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295 | xmlFreeDoc(doc); |
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296 | return NULL; |
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297 | } |
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298 | |
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299 | // ret vars |
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300 | *error = 0; |
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301 | |
415
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302 | CxAllocator *a = pool_allocator(sn->pool); |
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303 | // map for duplicate checking |
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304 | // value type: intptr_t |
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305 | CxMap *propmap = cxHashMapCreate(a, 32); |
211
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306 | if(!propmap) { |
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307 | *error = PROPPATCH_PARSER_OOM; |
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308 | xmlFreeDoc(doc); |
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309 | return NULL; |
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310 | } |
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311 | |
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312 | WebdavPList *set_begin = NULL; |
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313 | WebdavPList *set_end = NULL; |
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314 | WebdavPList *remove_begin = NULL; |
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315 | WebdavPList *remove_end = NULL; |
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316 | size_t set_count = 0; |
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317 | size_t remove_count = 0; |
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318 | |
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319 | int ret = 0; |
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320 | while(node && !ret) { |
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321 | if(node->type == XML_ELEMENT_NODE) { |
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322 | if(node->ns && xstreq(node->ns->href, "DAV:")) { |
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323 | // a propfind request can contain a prop element |
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324 | // with specified properties or the allprop or propname |
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325 | // element |
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326 | if(xstreq(node->name, "set")) { |
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327 | xmlNode *prop = find_child(node, "prop"); |
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328 | ret = parse_prop( |
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329 | sn, |
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330 | prop, |
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331 | propmap, |
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332 | &set_begin, |
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333 | &set_end, |
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334 | &set_count, |
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335 | TRUE, // proppatch = true |
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336 | error); |
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337 | } else if(xstreq(node->name, "remove")) { |
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338 | if(!allowremove) { |
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339 | *error = PROPPATCH_PARSER_INVALID_REQUEST; |
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340 | ret = 1; |
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341 | break; |
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342 | } |
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343 | xmlNode *prop = find_child(node, "prop"); |
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344 | ret = parse_prop( |
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345 | sn, |
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346 | prop, |
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347 | propmap, |
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348 | &remove_begin, |
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349 | &remove_end, |
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350 | &remove_count, |
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351 | TRUE, // proppatch = true |
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352 | error); |
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353 | } |
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354 | |
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355 | } |
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356 | } |
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357 | node = node->next; |
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358 | } |
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359 | |
415
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360 | cxMapDestroy(propmap); // allocated content must not be freed |
211
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361 | |
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362 | if(set_count + remove_count == 0) { |
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363 | *error = PROPPATCH_PARSER_NO_PROPERTIES; |
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364 | ret = 1; |
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365 | } |
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366 | |
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367 | if(ret) { |
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368 | xmlFreeDoc(doc); |
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369 | return NULL; |
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370 | } |
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371 | |
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372 | WebdavProppatchRequest *request = pool_malloc( |
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373 | sn->pool, |
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374 | sizeof(WebdavProppatchRequest)); |
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375 | if(!request) { |
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376 | *error = PROPPATCH_PARSER_OOM; |
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377 | xmlFreeDoc(doc); |
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378 | return NULL; |
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379 | } |
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380 | request->sn = sn; |
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381 | request->rq = rq; |
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382 | request->doc = doc; |
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383 | request->set = set_begin; |
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384 | request->setcount = set_count; |
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385 | request->remove = remove_begin; |
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386 | request->removecount = remove_count; |
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387 | return request; |
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388 | } |
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389 | |
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390 | WebdavLockRequest* lock_parse( |
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391 | Session *sn, |
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392 | Request *rq, |
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393 | const char *buf, |
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394 | size_t buflen, |
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395 | int *error) |
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396 | { |
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397 | xmlDoc *doc = xmlReadMemory(buf, buflen, NULL, NULL, 0); |
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398 | if(!doc) { |
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399 | *error = LOCK_PARSER_INVALID_REQUEST; |
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400 | return NULL; |
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401 | } |
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402 | |
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403 | xmlNode *root = xmlDocGetRootElement(doc); |
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404 | xmlNode *node = root->children; |
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405 | |
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406 | // check if the root element is correct |
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407 | if( |
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408 | !(root->ns |
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409 | && xstreq(root->ns->href, "DAV:") |
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410 | && xstreq(root->name, "lockinfo"))) |
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411 | { |
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412 | *error = LOCK_PARSER_NO_LOCKINFO; |
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413 | xmlFreeDoc(doc); |
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414 | return NULL; |
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415 | } |
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416 | |
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417 | WebdavLockScope lockscope = WEBDAV_LOCK_SCOPE_UNKNOWN; |
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418 | WebdavLockType locktype = WEBDAV_LOCK_TYPE_UNKNOWN; |
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419 | WSXmlNode *owner = NULL; |
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420 | |
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421 | int ret = 0; |
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422 | while(node && !ret) { |
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423 | if( |
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424 | node->type == XML_ELEMENT_NODE |
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425 | && node->ns |
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426 | && xstreq(node->ns->href, "DAV:")) |
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427 | { |
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428 | char *name = (char*)node->name; |
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429 | if(xstreq(name, "lockscope")) { |
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430 | xmlNode *s = node->children; |
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431 | while(s) { |
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432 | if( |
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433 | s->type == XML_ELEMENT_NODE |
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434 | && s->ns |
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435 | && xstreq(s->ns->href, "DAV:")) |
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436 | { |
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437 | if(xstreq(s->name, "exclusive")) { |
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438 | lockscope = WEBDAV_LOCK_EXCLUSIVE; |
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439 | } else if(xstreq(s->name, "shared")) { |
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440 | lockscope = WEBDAV_LOCK_SHARED; |
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441 | } else { |
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442 | // don't ignore unknown lockscope |
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443 | *error = LOCK_PARSER_UNKNOWN_ELEMENT; |
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444 | ret = 1; |
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445 | break; |
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446 | } |
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447 | } |
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448 | s = s->next; |
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449 | } |
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450 | } else if(xstreq(name, "locktype")) { |
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451 | xmlNode *t = node->children; |
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452 | while(t) { |
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453 | if( |
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454 | t->type == XML_ELEMENT_NODE |
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455 | && t->ns |
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456 | && xstreq(t->ns->href, "DAV:")) |
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457 | { |
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458 | if(xstreq(t->name, "write")) { |
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459 | locktype = WEBDAV_LOCK_WRITE; |
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460 | } else { |
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461 | *error = LOCK_PARSER_UNKNOWN_ELEMENT; |
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462 | ret = 1; |
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463 | break; |
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464 | } |
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465 | } |
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466 | t = t->next; |
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467 | } |
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468 | } else if(xstreq(name, "owner")) { |
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469 | owner = node->children; |
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470 | } |
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471 | } |
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472 | node = node->next; |
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473 | } |
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474 | |
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475 | if(ret) { |
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476 | xmlFreeDoc(doc); |
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477 | return NULL; |
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478 | } |
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479 | |
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480 | WebdavLockRequest *request = pool_malloc( |
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481 | sn->pool, |
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482 | sizeof(WebdavLockRequest)); |
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483 | if(!request) { |
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484 | *error = LOCK_PARSER_OOM; |
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485 | xmlFreeDoc(doc); |
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486 | return NULL; |
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487 | } |
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488 | request->sn = sn; |
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489 | request->rq = rq; |
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490 | request->doc = doc; |
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491 | |
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492 | if(locktype == WEBDAV_LOCK_TYPE_UNKNOWN) { |
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493 | locktype = WEBDAV_LOCK_WRITE; |
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494 | } |
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495 | if(lockscope == WEBDAV_LOCK_SCOPE_UNKNOWN) { |
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496 | lockscope = WEBDAV_LOCK_EXCLUSIVE; |
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497 | } |
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498 | request->scope = lockscope; |
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499 | request->type = locktype; |
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500 | request->owner = owner; |
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501 | return request; |
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502 | } |
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503 |