src/server/webdav/operation.c

Tue, 14 Jan 2020 20:05:18 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Tue, 14 Jan 2020 20:05:18 +0100
branch
webdav
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parent 221
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child 236
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permissions
-rw-r--r--

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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
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32 #include <ucx/list.h>
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33
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34 #include "../daemon/session.h"
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35
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36 #include "operation.h"
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37
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38 #define WEBDAV_PATH_MAX 8192
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39
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40 WebdavOperation* webdav_operation_create(
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41 Session *sn,
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42 Request *rq,
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43 WebdavBackend *dav,
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44 UcxList *requests,
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45 WebdavResponse *response)
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46 {
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47 WebdavOperation *op = pool_malloc(sn->pool, sizeof(WebdavOperation));
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48 ZERO(op, sizeof(WebdavOperation));
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49 op->dav = dav;
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50 op->sn = sn;
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51 op->rq = rq;
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52 op->requests = requests;
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53 op->response = response;
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54
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55 response->op = op;
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56
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57 return op;
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58 }
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59
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60 int webdav_op_propfind_begin(
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61 WebdavOperation *op,
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62 const char *href,
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63 VFS_DIR parent,
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64 struct stat *s)
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65 {
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66 // create WebdavResource object for requested resource
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67 WebdavResource *resource = op->response->addresource(op->response, href);
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68 if(!resource) {
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69 return REQ_ABORTED;
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70 }
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71
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72 // store data that we need when the resource will be closed
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73 op->stat = s;
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74 op->parent = parent;
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75
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76 // get first propfind object
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77 WebdavPropfindRequest *propfind = op->requests->data;
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78
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79 // execute propfind_do of the first backend for the first resource
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80 int ret = REQ_PROCEED;
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81 if(op->dav->propfind_do(propfind, op->response, NULL, resource, s)) {
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82 ret = REQ_ABORTED;
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83 } else {
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84 // propfind_do successful, close resource if needed
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85 // closing the resource will execute propfind_do of all remaining
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86 // backends
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87 if(!resource->isclosed) {
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88 ret = resource->close(resource);
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89 }
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90 }
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91
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92 return ret;
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93 }
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94
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95 typedef struct PathSearchElm {
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96 char *href;
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97 char *path;
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98 size_t hreflen;
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99 size_t pathlen;
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100 } PathSearchElm;
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101
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102 /*
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103 * concats base + / + elm
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104 * if baseinit is true, only elm is copied
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105 */
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106 static int path_buf_concat(
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107 pool_handle_t *pool,
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108 char **buf,
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109 size_t * restrict len,
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110 WSBool * restrict baseinit,
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111 const char *base,
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112 size_t baselen,
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113 const char *elm,
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114 size_t elmlen)
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115 {
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116 if(base[baselen-1] == '/') {
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117 baselen--;
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118 }
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119
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120 size_t newlen = baselen + elmlen + 1;
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121 if(newlen > WEBDAV_PATH_MAX) {
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122 log_ereport(LOG_FAILURE, "webdav: maximal path length exceeded");
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123 return 1;
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124 }
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125
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126 // check if new path + terminator fits in the buffer
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127 if(newlen + 1 > *len) {
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128 *len = newlen + 128;
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129 char *newbuf = pool_realloc(pool, *buf, newlen);
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130 if(newbuf) {
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131 log_ereport(LOG_FAILURE, "webdav: path memory allocation failed");
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132 return 1;
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133 }
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134 *baseinit = FALSE;
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135
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136 *buf = newbuf;
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137 }
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138
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139 // if baseinit is true, the parent is already in the buffer
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140 // and we don't need to memcpy it again
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141 if(!(*baseinit)) {
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142 memcpy(*buf, base, baselen);
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143 (*buf)[baselen] = '/';
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144 *baseinit = TRUE;
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145 }
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146 // copy child and terminate string
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147 memcpy((*buf) + baselen + 1, elm, elmlen);
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148 (*buf)[newlen] = '\0';
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149
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150 return 0;
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151 }
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152
217
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153 int webdav_op_propfind_children(
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154 WebdavOperation *op,
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155 VFSContext *vfs,
221
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156 const char *href,
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157 const char *path)
217
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158 {
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159 WebdavPropfindRequest *request = op->requests->data;
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160
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161 UcxAllocator *a = session_get_allocator(request->sn);
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162 pool_handle_t *pool = request->sn->pool;
221
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163
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164 PathSearchElm *start_elm = pool_malloc(pool, sizeof(PathSearchElm));
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165 start_elm->href = pool_strdup(pool, href);
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166 start_elm->path = pool_strdup(pool, path);
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167 start_elm->hreflen = strlen(href);
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168 start_elm->pathlen = strlen(path);
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169
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170 UcxList *stack = ucx_list_prepend_a(a, NULL, start_elm);
217
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171 UcxList *stack_end = stack;
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172 if(!stack) {
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173 return 1;
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174 }
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175
221
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176 // reusable buffer for full child path and href
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177 char *newpath = pool_malloc(pool, 256);
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178 size_t newpathlen = 256;
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179
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180 char *newhref = pool_malloc(pool, 256);
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181 size_t newhreflen = 256;
217
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182
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183 int err = 0;
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184 while(stack && !err) {
221
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185 PathSearchElm *cur_elm = stack->data;
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186
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187 // when newpath is initialized with the parent path
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188 // set path_buf_init to TRUE
221
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189 WSBool href_buf_init = FALSE;
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190 WSBool path_buf_init = FALSE;
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191
221
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192 VFS_DIR dir = vfs_opendir(vfs, cur_elm->path);
217
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193 if(!dir) {
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194 log_ereport(
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195 LOG_FAILURE,
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196 "webdav: propfind: cannot open directory %d",
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197 vfs->vfs_errno);
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198 err = 1;
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199 break;
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200 }
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201
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202 VFS_ENTRY f;
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203 while(vfs_readdir_stat(dir, &f)) {
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204 if(f.stat_errno != 0) {
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205 continue;
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206 }
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207
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208 size_t child_len = strlen(f.name);
221
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209
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210 // create new path and href for the child
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211 if(path_buf_concat(
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212 pool,
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213 &newhref,
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214 &newhreflen,
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215 &href_buf_init,
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216 cur_elm->href,
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217 cur_elm->hreflen,
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218 f.name,
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219 child_len))
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220 {
217
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221 err = 1;
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222 break;
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223 }
221
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224 if(path_buf_concat(
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225 pool,
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226 &newpath,
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227 &newpathlen,
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228 &path_buf_init,
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229 cur_elm->path,
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230 cur_elm->pathlen,
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231 f.name,
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232 child_len))
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233 {
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234 err = 1;
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235 break;
217
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236 }
221
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237 size_t childhreflen = cur_elm->hreflen + 1 + child_len;
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238 size_t childpathlen = cur_elm->pathlen + 1 + child_len;
217
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239
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240 // propfind for this child
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241 if(webdav_op_propfind_begin(op, newpath, dir, &f.stat)) {
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242 err = 1;
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243 break;
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244 }
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245
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246 // depth of -1 means infinity
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247 if(request->depth == -1 && S_ISDIR(f.stat.st_mode)) {
221
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248 char *hrefcp = pool_malloc(pool, childhreflen + 1);
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249 memcpy(hrefcp, newhref, childhreflen + 1);
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250 hrefcp[childhreflen] = '\0';
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251
217
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252 char *pathcp = pool_malloc(pool, childpathlen + 1);
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253 memcpy(pathcp, newpath, childpathlen + 1);
221
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254 pathcp[childpathlen] = '\0';
217
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255
221
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256 PathSearchElm *new_elm = pool_malloc(pool,
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257 sizeof(PathSearchElm));
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258 new_elm->href = hrefcp;
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259 new_elm->path = pathcp;
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260 new_elm->hreflen = childhreflen;
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261 new_elm->pathlen = childpathlen;
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262
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263 // add the new_elm to the stack
217
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264 // stack_end is always not NULL here, because we remove
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265 // the first stack element at the end of the loop
221
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266 UcxList *newlistelm = ucx_list_append_a(a, stack_end, new_elm);
217
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267 if(!newlistelm) {
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268 err = 1;
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269 break;
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270 }
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271 stack_end = newlistelm;
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272 }
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273 }
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274
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275 vfs_closedir(dir);
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276
221
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277 pool_free(pool, cur_elm->path);
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278 pool_free(pool, cur_elm->href);
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279 pool_free(pool, cur_elm);
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280
217
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281 stack = ucx_list_remove_a(a, stack, stack);
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282 }
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283
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284 // in case of an error, we have to free all remaining stack elements
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285 UCX_FOREACH(elm, stack) {
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286 char *data = elm->data;
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287 if(data != path) {
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288 pool_free(pool, data);
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289 }
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290 }
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291
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292 return err;
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293 }
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294
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295 int webdav_op_propfiond_close_resource(
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296 WebdavOperation *op,
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297 WebdavResource *resource)
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298 {
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299 // start with second backend and request, because
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300 // the first one was already called by webdav_op_propfind_begin
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301 WebdavBackend *dav = op->dav->next;
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302 UcxList *request = op->requests->next;
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303
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304 // call propfind_do of all remaining backends
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305 int ret = REQ_PROCEED;
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306 while(dav && request) {
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307 if(dav->propfind_do(
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308 request->data,
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309 op->response,
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310 op->parent,
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311 resource,
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312 op->stat))
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313 {
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314 ret = REQ_ABORTED;
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315 }
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316
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317 dav = dav->next;
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318 request = request->next;
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319 }
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320 return ret;
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321 }
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322
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323 /*
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324 * Executes propfind_finish for each Backend
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325 */
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326 int webdav_op_propfind_finish(WebdavOperation *op) {
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327 WebdavBackend *dav = op->dav;
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328 UcxList *requests = op->requests;
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329
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330 int ret = REQ_PROCEED;
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331 while(dav && requests) {
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332 if(dav->propfind_finish(requests->data)) {
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333 ret = REQ_ABORTED;
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334 }
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335
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336 dav = dav->next;
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337 requests = requests->next;
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338 }
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339 return ret;
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340 }

mercurial