src/server/webdav/webdav.c

Sun, 15 Jan 2012 17:00:16 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sun, 15 Jan 2012 17:00:16 +0100
changeset 16
a9bbd82d2dce
parent 15
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child 20
7b235fa88008
permissions
-rw-r--r--

New configuration file parser

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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 2011 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 "webdav.h"
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34 #include "../ucx/string.h"
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35 #include "../util/pool.h"
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36 #include "../util/pblock.h"
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37
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38 #include "davparser.h"
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39
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40 int webdav_service(pblock *pb, Session *sn, Request *rq) {
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41 /* TODO:
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42 * Dies ist die Implementierung für PROPFIND. Es sollte für jede webdav-
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43 * Methode eine eigene Service-Funktion geben. Solange die anderen
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44 * Methoden nicht implementiert werden, behandelt webdav_service nur
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45 * PROPFIND.
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46 */
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47
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48 /* TODO: clean up if errors occurs */
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49
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50 /* Get request body which contains the webdav XML request */
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51 char *xml_body;
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52 size_t xml_len = 0;
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53
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54 char *ctlen = pblock_findkeyval(pb_key_content_length, rq->headers);
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55 if(ctlen) {
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56 xml_len = atoi(ctlen);
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57 } else {
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58 /* invalid request */
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59 return REQ_ABORTED;
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60 }
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61
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62 xml_body = pool_malloc(sn->pool, xml_len + 1);
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63 xml_body[xml_len] = 0;
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64 if(!xml_body) {
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65 /* server error */
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66 return REQ_ABORTED;
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67 }
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68
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69 /* TODO: bug with multi reads */
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70 int r = 0;
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71 char *xb = xml_body;
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72 size_t xl = xml_len;
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73 while((r = netbuf_getbytes(sn->inbuf, xb, xl)) != NETBUF_EOF) {
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74 xb += r;
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75 xl -= xml_len;
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76 }
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77
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78 PropfindRequest *davrq = dav_parse_propfind(sn, rq, xml_body, xml_len);
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79 davrq->sn = sn;
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80 davrq->rq = rq;
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81 davrq->propertyBackend = create_property_backend();
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82 davrq->notFoundProps = NULL;
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83 davrq->forbiddenProps = NULL;
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84 davrq->out = sbuf_new(512);
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85
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86 /* write header */
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87 sbuf_puts(davrq->out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
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88 sbuf_puts(davrq->out, "<D:multistatus xmlns:D=\"DAV:\">\n");
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89
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90 /* get stat of file */
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91 char *ppath = pblock_findkeyval(pb_key_ppath, rq->vars);
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92 char *uri = pblock_findkeyval(pb_key_uri, rq->reqpb);
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93
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94 struct stat st;
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95 if(stat(ppath, &st) != 0) {
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96 perror("webdav_service: stat");
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97 return REQ_ABORTED;
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98 }
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99 /* TODO: check for more modes */
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100 if(S_ISDIR(st.st_mode)) {
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101 DIR *dir = opendir(ppath);
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102 if(dir == NULL) {
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103 protocol_status(sn, rq, 500, NULL);
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104 printf("webdav_service: DIR is null\n");
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105 return REQ_ABORTED;
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106 }
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107
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108 struct dirent *f;
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109 while((f = readdir(dir)) != NULL) {
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110 if(strcmp(f->d_name, ".") == 0 || strcmp(f->d_name, "..") == 0) {
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111 continue;
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112 }
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113
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114 sstr_t filename = sstr(f->d_name);
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115 sstr_t _path = sstr(ppath);
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116 sstr_t _uri = sstr(uri);
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117
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118 sstr_t newuri;
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119 newuri.length = filename.length + _uri.length;
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120 newuri.ptr = alloca(newuri.length + 1);
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121 newuri = sstrncat(2, newuri, _uri, filename);
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122
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123 sstr_t newpath;
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124 newpath.length = _path.length + filename.length;
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125 newpath.ptr = alloca(newpath.length + 1);
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126 newpath = sstrncat(2, newpath, _path, filename);
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127
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128 davrq->path = newpath.ptr;
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129 davrq->uri = newuri.ptr;
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130 dav_create_response(davrq);
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131 }
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132 }
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133 davrq->path = ppath;
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134 davrq->uri = uri;
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135 dav_create_response(davrq);
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136
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137 sbuf_puts(davrq->out, "</D:multistatus>\n");
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138
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139 /* send buffer to client */
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140 pblock_removekey(pb_key_content_type, rq->srvhdrs);
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141 pblock_nvinsert("content-type", "text/xml", rq->srvhdrs);
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142 pblock_nninsert("content-length", davrq->out->length, rq->srvhdrs);
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143
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144 protocol_status(sn, rq, 207, NULL);
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145 http_start_response(sn, rq);
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146
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147 net_write(sn->csd, davrq->out->ptr, davrq->out->length);
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148
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149 return REQ_PROCEED;
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150 }
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151
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152 int dav_foreach_reqprop(UcxDlist *list, PropfindRequest *davrq) {
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153 DavProperty *prop = list->data;
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154 int error = 0;
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155
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156 char *str = davrq->propertyBackend->get_property(
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157 davrq->propertyBackend,
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158 davrq,
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159 davrq->path,
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160 prop->xmlns,
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161 prop->name,
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162 &error);
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163 if(str == NULL) {
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164 UcxDlist **dl = NULL;
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165 if(error == 404) {
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166 dl = &davrq->notFoundProps;
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167 } else {
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168 dl = &davrq->forbiddenProps;
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169 }
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170 *dl = ucx_dlist_append(*dl, prop);
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171 } else {
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172 //printf("dav property: {%s|%s::%s\n", prop->xmlns, prop->name, str);
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173 sbuf_puts(davrq->out, "<D:");
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174 sbuf_puts(davrq->out, prop->name);
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175 sbuf_puts(davrq->out, ">");
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176 sbuf_puts(davrq->out, str);
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177 sbuf_puts(davrq->out, "</D:");
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178 sbuf_puts(davrq->out, prop->name);
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179 sbuf_puts(davrq->out, ">\n");
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180 }
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181 return 0;
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182 }
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183
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184 void dav_create_response(PropfindRequest *davrq) {
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185 sbuf_puts(davrq->out, "<D:response>\n");
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186
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187 sbuf_puts(davrq->out, "<D:href>");
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188 sbuf_puts(davrq->out, davrq->uri);
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189 sbuf_puts(davrq->out, "</D:href>\n");
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190
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191 sbuf_puts(davrq->out, "<D:propstat>\n<D:prop>\n");
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192
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193 ucx_dlist_foreach(
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194 davrq->properties,
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195 (ucx_callback)dav_foreach_reqprop,
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196 davrq);
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197
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198 sbuf_puts(davrq->out, "</D:prop>\n<D:status>HTTP/1.1 200 OK</D:status>\n");
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199 sbuf_puts(davrq->out, "</D:propstat>\n");
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200
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201 /* 404 props */
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202 sbuf_puts(davrq->out, "<D:propstat>\n<D:prop>\n");
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203 UcxDlist *dl = davrq->notFoundProps;
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204 while(dl != NULL) {
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205 DavProperty *nfp = dl->data;
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206 sbuf_puts(davrq->out, "<D:");
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207 sbuf_puts(davrq->out, nfp->name);
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208 sbuf_puts(davrq->out, " />\n");
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209 dl = dl->next;
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210 }
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211 sbuf_puts(davrq->out, "</D:prop>\n");
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212 sbuf_puts(davrq->out, "<D:status>HTTP/1.1 404 Not Found</D:status>\n");
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213 sbuf_puts(davrq->out, "</D:propstat>\n");
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214
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215 /* end */
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216 sbuf_puts(davrq->out, "</D:response>\n");
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217
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218 }
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219
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220 char* dav_get_property(
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221 DAVPropertyBackend *b,
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222 PropfindRequest *davrq,
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223 char *path,
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224 char *xmlns,
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225 char *name,
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226 int *error)
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227 {
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228 DAVDefaultBackend *be = (DAVDefaultBackend*)b;
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229 *error = 200;
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230
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231 if(strcmp(name, "getcontentlength") == 0) {
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232 struct stat s;
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233 if(stat(davrq->path, &s) != 0) {
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234 *error = 403; /* really? */
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235 return NULL;
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236 }
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237 if(S_ISDIR(s.st_mode)) {
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238 *error = 404;
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239 return NULL;
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240 }
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241 char *buf = pool_malloc(davrq->sn->pool, 24);
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242 sprintf(buf, "%d", s.st_size);
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243 return buf;
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244 }
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245
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246 *error = 404;
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247 return NULL;
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248 }
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249
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250 DAVPropertyBackend* create_property_backend() {
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251 DAVDefaultBackend *backend = malloc(sizeof(DAVDefaultBackend));
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252 backend->backend.get_property = dav_get_property;
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253 backend->path = NULL;
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254 backend->s = 0;
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255 return (DAVPropertyBackend*)backend;
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256 }

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