src/server/webdav/operation.c

Tue, 19 Apr 2022 20:32:45 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Tue, 19 Apr 2022 20:32:45 +0200
branch
webdav
changeset 303
ad9ba51c8634
parent 263
533f9097d712
child 306
e03737cea6e2
permissions
-rw-r--r--

add pg webdav backend initialization

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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 <errno.h>
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32
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33 #include <ucx/list.h>
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34
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35 #include "../daemon/session.h"
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36 #include "../util/pblock.h"
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37
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38 #include "operation.h"
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39
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40 #define WEBDAV_PATH_MAX 8192
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41
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42
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43 size_t webdav_num_backends(WebdavBackend *dav) {
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44 size_t count = 0;
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45 while(dav) {
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46 count++;
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47 dav = dav->next;
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48 }
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49 return count;
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50 }
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51
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52 /****************************************************************************
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53 *
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54 * PROPFIND OPERATION
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55 *
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56 ****************************************************************************/
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57
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58 WebdavOperation* webdav_create_propfind_operation(
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59 Session *sn,
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60 Request *rq,
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61 WebdavBackend *dav,
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62 WebdavPList *reqprops,
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63 UcxList *requests,
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64 WebdavResponse *response)
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65 {
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66 WebdavOperation *op = pool_malloc(sn->pool, sizeof(WebdavOperation));
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67 ZERO(op, sizeof(WebdavOperation));
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68 op->dav = dav;
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69 op->sn = sn;
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70 op->rq = rq;
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71 op->reqprops = reqprops;
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72 op->requests = requests;
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73 op->response = response;
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74 op->response_close = webdav_op_propfiond_close_resource;
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75 response->op = op;
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76
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77 return op;
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78 }
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79
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80 int webdav_op_propfind_begin(
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81 WebdavOperation *op,
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82 const char *href,
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83 VFS_DIR parent,
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84 struct stat *s)
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85 {
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86 // create WebdavResource object for requested resource
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87 WebdavResource *resource = op->response->addresource(op->response, href);
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88 if(!resource) {
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89 return REQ_ABORTED;
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90 }
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91
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92 // store data that we need when the resource will be closed
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93 op->stat = s;
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94 op->parent = parent;
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95
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96 // get first propfind object
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97 WebdavPropfindRequest *propfind = op->requests->data;
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98
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99 // execute propfind_do of the first backend for the first resource
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100 int ret = REQ_PROCEED;
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101 if(op->dav->propfind_do(propfind, op->response, NULL, resource, s)) {
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102 ret = REQ_ABORTED;
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103 } else {
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104 // propfind_do successful, close resource if needed
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105 // closing the resource will execute propfind_do of all remaining
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106 // backends
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107 if(!resource->isclosed) {
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108 ret = resource->close(resource);
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109 }
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110 }
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111
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112 return ret;
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113 }
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114
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115 typedef struct PathSearchElm {
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116 char *href;
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117 char *path;
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118 size_t hreflen;
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119 size_t pathlen;
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120 } PathSearchElm;
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121
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122 /*
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123 * concats base + / + elm
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124 * if baseinit is true, only elm is copied
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125 */
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126 static int path_buf_concat(
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127 pool_handle_t *pool,
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128 char **buf,
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129 size_t * restrict len,
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130 WSBool * restrict baseinit,
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131 const char *base,
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132 size_t baselen,
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133 const char *elm,
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134 size_t elmlen)
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135 {
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136 if(base[baselen-1] == '/') {
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137 baselen--;
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138 }
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139
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140 size_t newlen = baselen + elmlen + 1;
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141 if(newlen > WEBDAV_PATH_MAX) {
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142 log_ereport(LOG_FAILURE, "webdav: maximal path length exceeded");
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143 return 1;
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144 }
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145
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146 // check if new path + terminator fits in the buffer
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147 if(newlen + 1 > *len) {
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148 *len = newlen + 128;
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149 char *newbuf = pool_realloc(pool, *buf, newlen);
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150 if(newbuf) {
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151 log_ereport(LOG_FAILURE, "webdav: path memory allocation failed");
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152 return 1;
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153 }
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154 *baseinit = FALSE;
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155
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156 *buf = newbuf;
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157 }
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158
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159 // if baseinit is true, the parent is already in the buffer
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160 // and we don't need to memcpy it again
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161 if(!(*baseinit)) {
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162 memcpy(*buf, base, baselen);
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163 (*buf)[baselen] = '/';
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164 *baseinit = TRUE;
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165 }
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166 // copy child and terminate string
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167 memcpy((*buf) + baselen + 1, elm, elmlen);
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168 (*buf)[newlen] = '\0';
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169
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170 return 0;
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171 }
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172
246
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173 static int propfind_child_cb(
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174 VFSContext *vfs,
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175 const char *href,
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176 const char *path,
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177 VFSDir *parent,
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178 struct stat *s,
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179 void *op)
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180 {
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181 return webdav_op_propfind_begin(op, href, parent, s);
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182 }
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183
217
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184 int webdav_op_propfind_children(
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185 WebdavOperation *op,
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186 VFSContext *vfs,
221
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187 const char *href,
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188 const char *path)
217
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189 {
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190 WebdavPropfindRequest *request = op->requests->data;
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191 return webdav_op_iterate_children(
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192 vfs, request->depth, href, path, propfind_child_cb, op);
217
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193 }
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194
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195 int webdav_op_propfiond_close_resource(
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196 WebdavOperation *op,
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197 WebdavResource *resource)
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198 {
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199 // start with second backend and request, because
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200 // the first one was already called by webdav_op_propfind_begin
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201 WebdavBackend *dav = op->dav->next;
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202 UcxList *request = op->requests->next;
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203
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204 // call propfind_do of all remaining backends
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205 int ret = REQ_PROCEED;
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206 while(dav && request) {
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207 if(dav->propfind_do(
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208 request->data,
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209 op->response,
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210 op->parent,
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211 resource,
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212 op->stat))
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213 {
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214 ret = REQ_ABORTED;
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215 }
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216
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217 dav = dav->next;
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218 request = request->next;
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219 }
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220 return ret;
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221 }
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222
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223 /*
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224 * Executes propfind_finish for each Backend
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225 */
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226 int webdav_op_propfind_finish(WebdavOperation *op) {
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227 WebdavBackend *dav = op->dav;
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228 UcxList *requests = op->requests;
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229
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230 int ret = REQ_PROCEED;
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231 while(dav && requests) {
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232 if(dav->propfind_finish(requests->data)) {
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233 ret = REQ_ABORTED;
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234 }
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235
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236 dav = dav->next;
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237 requests = requests->next;
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238 }
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239 return ret;
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240 }
239
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241
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242 /****************************************************************************
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243 *
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244 * PROPPATCH OPERATION
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245 *
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246 ****************************************************************************/
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247
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248 WebdavOperation* webdav_create_proppatch_operation(
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249 Session *sn,
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250 Request *rq,
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251 WebdavBackend *dav,
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252 WebdavProppatchRequest *proppatch,
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253 WebdavResponse *response)
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254 {
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255 WebdavOperation *op = pool_malloc(sn->pool, sizeof(WebdavOperation));
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256 ZERO(op, sizeof(WebdavOperation));
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257 op->dav = dav;
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258 op->sn = sn;
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259 op->rq = rq;
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260 op->reqprops = NULL;
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261 op->response = response;
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262 op->proppatch = proppatch;
239
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263 op->response_close = webdav_op_proppatch_close_resource;
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264 response->op = op;
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265
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266 return op;
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267 }
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268
241
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269
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270
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271 int webdav_op_proppatch(
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272 WebdavOperation *op,
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273 const char *href,
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274 const char *path)
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275 {
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276 WebdavProppatchRequest *orig_request = op->proppatch;
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277 UcxAllocator *a = session_get_allocator(op->sn);
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278
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279 // create WebdavResource object for the requested resource
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280 WebdavResource *resource = op->response->addresource(op->response, href);
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281 if(!resource) {
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282 return REQ_ABORTED;
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283 }
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284
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285 VFSContext *ctx = NULL;
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286 VFSFile *file = NULL;
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287
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288 // requests for each backends
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289 WebdavProppatchRequest **requests = pool_calloc(
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290 op->sn->pool,
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291 webdav_num_backends(op->dav),
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292 sizeof(WebdavProppatchRequest*));
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293 if(requests == NULL) {
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294 return REQ_ABORTED;
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295 }
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296
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297 WebdavPList *prev_set = orig_request->set;
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298 WebdavPList *prev_remove = orig_request->remove;
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299 size_t set_count = orig_request->setcount;
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300 size_t remove_count = orig_request->removecount;
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301
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302 int ret = REQ_PROCEED;
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303
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304 // iterate backends and execute proppatch_do
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305 WebdavBackend *dav = op->dav;
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306 size_t numrequests = 0;
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307 while(dav) {
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308 WebdavPList *set = webdav_plist_clone_s(
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309 op->sn->pool,
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310 prev_set,
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311 &set_count);
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312 WebdavPList *remove = webdav_plist_clone_s(
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313 op->sn->pool,
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314 prev_remove,
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315 &remove_count);
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316 if((prev_set && !set) || (prev_remove && !remove)) {
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317 // clone failed, OOM
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318 ret = REQ_ABORTED;
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319 break;
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320 }
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321
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322 // create new WebdavProppatchRequest object for this backend
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323 WebdavProppatchRequest *req = pool_malloc(
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324 op->sn->pool,
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325 sizeof(WebdavProppatchRequest));
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326 memcpy(req, orig_request, sizeof(WebdavProppatchRequest));
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327 req->set = set;
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328 req->setcount = set_count;
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329 req->remove = remove;
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330 req->removecount = remove_count;
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331 req->userdata = NULL;
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332
263
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333 // check if we need to open the file because the backend wants it
241
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334 if(!file && (dav->settings & WS_WEBDAV_PROPPATCH_USE_VFS)
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335 == WS_WEBDAV_PROPPATCH_USE_VFS)
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336 {
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337 ctx = vfs_request_context(op->sn, op->rq);
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338 if(!ctx) {
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339 ret = REQ_ABORTED;
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340 break;
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341 }
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342
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343 file = vfs_open(ctx, path, O_RDONLY);
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344 if(!file) {
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345 protocol_status(
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346 op->sn,
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347 op->rq,
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348 util_errno2status(ctx->vfs_errno),
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349 NULL);
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350 ret = REQ_ABORTED;
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351 }
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352 }
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353
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354 // execute proppatch_do
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355 if(dav->proppatch_do(req, resource, file, &set, &remove)) {
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356 // return later, because we need do execute proppatch_finish
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357 // for all successfully called backends
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358 ret = REQ_ABORTED;
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359 break;
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360 }
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361
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362 // proppatch_do should remove all handled props from set and remove
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363 // in the next iteration, the backend must use these reduced lists
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364 prev_set = set;
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365 prev_remove = remove;
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366
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367 requests[numrequests++] = req;
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368
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369 // continue with next backend
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370 dav = dav->next;
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371 }
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372
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373 WSBool commit = FALSE;
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374 if(ret == REQ_PROCEED && resource->err == 0) {
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375 // no errors, no properties with errors -> save the changes
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376 commit = TRUE;
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377 }
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378
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379 // call proppatch_finish for each successfully called proppatch_do
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380 dav = op->dav;
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381 int i = 0;
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382 while(dav && i < numrequests) {
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383 if(dav->proppatch_finish(requests[i], resource, file, commit)) {
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384 ret = REQ_ABORTED;
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385 }
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386 i++;
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387 dav = dav->next;
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388 }
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389
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390 if(file) {
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391 vfs_close(file);
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392 }
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393
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394 if(resource->close(resource)) {
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395 ret = REQ_ABORTED;
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396 }
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397
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398 return ret;
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399 }
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400
239
d5031c30022c make multistatus response ready for proppatch requests
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401 int webdav_op_proppatch_close_resource(
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402 WebdavOperation *op,
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403 WebdavResource *resource)
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404 {
241
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405 return 0; // NOP
239
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406 }
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407
245
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408
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409 /****************************************************************************
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410 *
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411 * VFS OPERATION
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412 *
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413 ****************************************************************************/
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414
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415 WebdavVFSOperation* webdav_vfs_op(
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416 Session *sn,
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417 Request *rq,
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418 WebdavBackend *dav,
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419 WSBool precondition)
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420 {
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421 WebdavVFSOperation *op = pool_malloc(sn->pool, sizeof(WebdavVFSOperation));
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422 if(!op) {
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423 return NULL;
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424 }
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425 ZERO(op, sizeof(WebdavVFSOperation));
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426
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427 op->sn = sn;
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428 op->rq = rq;
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429 op->dav = dav;
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430 op->stat = NULL;
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431 op->stat_errno = 0;
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432
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433 // create VFS context
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434 VFSContext *vfs = vfs_request_context(sn, rq);
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435 if(!vfs) {
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436 pool_free(sn->pool, op);
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437 return NULL;
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438 }
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439 op->vfs = vfs;
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440
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441 char *path = pblock_findkeyval(pb_key_path, rq->vars);
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442 op->path = path;
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443
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444 return op;
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445 }
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446
247
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447 WebdavVFSOperation webdav_vfs_sub_op(
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448 WebdavVFSOperation *op,
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449 char *path,
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450 struct stat *s)
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451 {
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452 WebdavVFSOperation sub;
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453 sub.dav = op->dav;
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454 sub.path = path;
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455 sub.sn = op->sn;
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456 sub.vfs = op->vfs;
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3b302093945c add webdav_delete tests
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457 sub.path = path;
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458 sub.stat = s;
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459 sub.stat_errno = 0;
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460 return sub;
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461 }
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462
246
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463 int webdav_op_iterate_children(
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464 VFSContext *vfs,
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465 int depth,
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466 const char *href,
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467 const char *path,
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468 vfs_op_child_func func,
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469 void *userdata)
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470 {
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471 UcxAllocator *a = session_get_allocator(vfs->sn);
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472 pool_handle_t *pool = vfs->sn->pool;
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473
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474 PathSearchElm *start_elm = pool_malloc(pool, sizeof(PathSearchElm));
247
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475 start_elm->href = pool_strdup(pool, href ? href : "");
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476 start_elm->path = pool_strdup(pool, path ? path : "");
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477 start_elm->hreflen = href ? strlen(href) : 0;
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478 start_elm->pathlen = path ? strlen(path) : 0;
246
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479
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480 UcxList *stack = ucx_list_prepend_a(a, NULL, start_elm);
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481 UcxList *stack_end = stack;
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482 if(!stack) {
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483 return 1;
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484 }
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485
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486 // reusable buffer for full child path and href
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487 char *newpath = pool_malloc(pool, 256);
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488 size_t newpathlen = 256;
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489
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490 char *newhref = pool_malloc(pool, 256);
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491 size_t newhreflen = 256;
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492
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493 int err = 0;
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494 while(stack && !err) {
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495 PathSearchElm *cur_elm = stack->data;
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496
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497 // when newpath is initialized with the parent path
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498 // set path_buf_init to TRUE
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499 WSBool href_buf_init = FALSE;
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500 WSBool path_buf_init = FALSE;
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501
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502 VFS_DIR dir = vfs_opendir(vfs, cur_elm->path);
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503 if(!dir) {
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504 log_ereport(
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505 LOG_FAILURE,
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506 "webdav: propfind: cannot open directory %d",
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507 vfs->vfs_errno);
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508 err = 1;
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509 break;
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510 }
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511
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512 VFS_ENTRY f;
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513 while(vfs_readdir_stat(dir, &f)) {
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514 if(f.stat_errno != 0) {
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515 continue;
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516 }
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517
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518 size_t child_len = strlen(f.name);
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519
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520 // create new path and href for the child
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521 if(path_buf_concat(
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522 pool,
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523 &newhref,
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524 &newhreflen,
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525 &href_buf_init,
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526 cur_elm->href,
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527 cur_elm->hreflen,
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528 f.name,
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529 child_len))
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530 {
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531 err = 1;
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532 break;
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533 }
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534 if(path_buf_concat(
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535 pool,
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536 &newpath,
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537 &newpathlen,
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538 &path_buf_init,
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539 cur_elm->path,
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540 cur_elm->pathlen,
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541 f.name,
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542 child_len))
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543 {
155bdef7fe7e add webdav op function for iterating directories
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544 err = 1;
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545 break;
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546 }
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547 size_t childhreflen = cur_elm->hreflen + 1 + child_len;
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548 size_t childpathlen = cur_elm->pathlen + 1 + child_len;
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549
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550 // execute callback func for this file
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551 if(func(vfs, newhref, newpath, dir, &f.stat, userdata)) {
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552 err = 1;
155bdef7fe7e add webdav op function for iterating directories
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553 break;
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554 }
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555
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556 // depth of -1 means infinity
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557 if(depth == -1 && S_ISDIR(f.stat.st_mode)) {
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558 char *hrefcp = pool_malloc(pool, childhreflen + 1);
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559 memcpy(hrefcp, newhref, childhreflen + 1);
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560 hrefcp[childhreflen] = '\0';
155bdef7fe7e add webdav op function for iterating directories
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561
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562 char *pathcp = pool_malloc(pool, childpathlen + 1);
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563 memcpy(pathcp, newpath, childpathlen + 1);
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564 pathcp[childpathlen] = '\0';
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565
155bdef7fe7e add webdav op function for iterating directories
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566 PathSearchElm *new_elm = pool_malloc(pool,
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567 sizeof(PathSearchElm));
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568 new_elm->href = hrefcp;
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569 new_elm->path = pathcp;
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570 new_elm->hreflen = childhreflen;
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571 new_elm->pathlen = childpathlen;
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572
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573 // add the new_elm to the stack
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574 // stack_end is always not NULL here, because we remove
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575 // the first stack element at the end of the loop
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576 UcxList *newlistelm = ucx_list_append_a(a, stack_end, new_elm);
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577 if(!newlistelm) {
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578 err = 1;
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579 break;
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580 }
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581 stack_end = newlistelm;
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582 }
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diff changeset
583 }
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584
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585 vfs_closedir(dir);
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586
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587 pool_free(pool, cur_elm->path);
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588 pool_free(pool, cur_elm->href);
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589 pool_free(pool, cur_elm);
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590
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591 stack = ucx_list_remove_a(a, stack, stack);
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592 }
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593
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594 // in case of an error, we have to free all remaining stack elements
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595 UCX_FOREACH(elm, stack) {
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596 char *data = elm->data;
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597 if(data != path) {
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598 pool_free(pool, data);
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599 }
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600 }
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601
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602 return err;
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603 }
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604
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605
245
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606 int webdav_vfs_stat(WebdavVFSOperation *op) {
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607 if(op->stat) {
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608 return 0;
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609 } else if(op->stat_errno != 0) {
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610 // previous stat failed
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611 return 1;
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612 }
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613
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614 // stat file
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615 struct stat sbuf;
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616 int ret = vfs_stat(op->vfs, op->path, &sbuf);
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617 if(!ret) {
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618 // save result in op->stat and in s
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619 op->stat = pool_malloc(op->sn->pool, sizeof(struct stat));
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620 if(op->stat) {
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621 memcpy(op->stat, &sbuf, sizeof(struct stat));
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622 } else {
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623 ret = 1;
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624 op->stat_errno = ENOMEM;
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625 }
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626 } else {
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627 op->stat_errno = errno;
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628 }
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629
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630 return ret;
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631 }
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632
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633 int webdav_vfs_op_do(WebdavVFSOperation *op, WebdavVFSOpType type) {
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634 WSBool exec_vfs = TRUE;
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635
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636 // requests for each backends
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637 WebdavVFSRequest **requests = pool_calloc(
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638 op->sn->pool,
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639 webdav_num_backends(op->dav),
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640 sizeof(WebdavVFSRequest*));
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641 if(requests == NULL) {
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642 return REQ_ABORTED;
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643 }
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644
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645 int ret = REQ_PROCEED;
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646
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647 // call opt_* func for each backend
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648 WebdavBackend *dav = op->dav;
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649 int called_backends = 0;
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650 while(dav) {
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651 WebdavVFSRequest *request = NULL;
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652
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653 // get vfs operation functions
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654 vfs_op_func op_func = NULL;
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655 vfs_op_finish_func op_finish_func = NULL;
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656
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657 if(type == WEBDAV_VFS_MKDIR) {
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658 op_func = dav->opt_mkcol;
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659 op_finish_func = dav->opt_mkcol_finish;
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660 } else if(type == WEBDAV_VFS_DELETE) {
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661 op_func = dav->opt_delete;
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662 op_finish_func = dav->opt_delete_finish;
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663 }
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664
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665 if(op_func || op_finish_func) {
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666 // we need a request object
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667 request = pool_malloc(op->sn->pool, sizeof(WebdavVFSRequest));
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668 if(!request) {
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669 exec_vfs = FALSE;
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670 ret = REQ_ABORTED;
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671 break;
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672 }
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673 request->sn = op->sn;
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674 request->rq = op->rq;
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675 request->path = op->path;
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676 request->userdata = NULL;
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677
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678 requests[called_backends] = request;
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679 }
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680
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681 // exec backend func for this operation
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682 // this will set 'done' to TRUE, if no further vfs call is required
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683 WSBool done = FALSE;
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684 called_backends++;
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685 if(op_func) {
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686 if(op_func(request, &done)) {
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687 exec_vfs = FALSE;
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688 ret = REQ_ABORTED;
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689 break;
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690 }
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691 }
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692 if(done) {
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693 exec_vfs = FALSE;
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694 }
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695
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696 dav = dav->next;
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697 }
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698
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699 // if needed, call vfs func for this operation
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700 if(exec_vfs) {
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701 int r = 0;
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702 if(type == WEBDAV_VFS_MKDIR) {
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703 r = vfs_mkdir(op->vfs, op->path);
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704 } else if(type == WEBDAV_VFS_DELETE) {
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705 r = webdav_vfs_unlink(op);
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706 }
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707
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708 if(r) {
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709 ret = REQ_ABORTED;
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710 }
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711 }
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712
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713 WSBool success = ret == REQ_PROCEED ? TRUE : FALSE;
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714
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715 // finish mkcol (cleanup) by calling opt_*_finish for each backend
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716 dav = op->dav;
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717 int i = 0;
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718 while(dav && i < called_backends) {
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719 // get vfs operation functions
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720 vfs_op_finish_func op_finish_func = NULL;
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721
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722 if(type == WEBDAV_VFS_MKDIR) {
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723 op_finish_func = dav->opt_mkcol_finish;
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724 } else if(type == WEBDAV_VFS_DELETE) {
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725 op_finish_func = dav->opt_delete_finish;
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726 }
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727
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728 if(op_finish_func) {
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729 if(op_finish_func(requests[i], success)) {
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730 ret = REQ_ABORTED; // don't exit loop
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731 }
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732 }
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733
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734 dav = dav->next;
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735 i++;
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736 }
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737
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738 return ret;
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739 }
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740
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741 int webdav_vfs_unlink(WebdavVFSOperation *op) {
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742 // stat the file first, to check if the file is a directory
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743 if(webdav_vfs_stat(op)) {
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744 return 1; // error
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745 } else {
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746 if(!S_ISDIR(op->stat->st_mode)) {
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747 return vfs_unlink(op->vfs, op->path);
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748 } else {
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749 return vfs_rmdir(op->vfs, op->path);
245
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750 }
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751 }
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752 }

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