webcit/groupdav_main.c

   1 /*
   2  * $Id$
   3  *
   4  * Entry point for GroupDAV functions
   5  *
   6  */
   7
   8 #include "webcit.h"
   9 #include "webserver.h"
  10 #include "groupdav.h"
  11
  12
  13 /*
  14  * Output HTTP headers which are common to all requests.
  15  *
  16  * Please observe that we don't use the usual output_headers()
  17  * and wDumpContent() functions in the GroupDAV subsystem, so we
  18  * do our own header stuff here.
  19  *
  20  */
  21 void groupdav_common_headers(void) {
  22         wprintf(
  23                 "Server: %s / %s\r\n"
  24                 "Connection: close\r\n",
  25                 SERVER, serv_info.serv_software
  26         );
  27 }
  28
  29
  30
  31 /*
  32  * string conversion function
  33  */
  34 void euid_escapize(char *target, char *source) {
  35         int i;
  36         int target_length = 0;
  37
  38         strcpy(target, "");
  39         for (i=0; i<strlen(source); ++i) {
  40                 if (isalnum(source[i])) {
  41                         target[target_length] = source[i];
  42                         target[++target_length] = 0;
  43                 }
  44                 else if (source[i] == ' ') {
  45                         target[target_length] = '_';
  46                         target[++target_length] = 0;
  47                 }
  48                 else if (source[i] == '-') {
  49                         target[target_length] = '-';
  50                         target[++target_length] = 0;
  51                 }
  52                 else {
  53                         sprintf(&target[target_length], "%%%02X", source[i]);
  54                         target_length += 3;
  55                 }
  56         }
  57 }
  58
  59 /*
  60  * string conversion function
  61  */
  62 void euid_unescapize(char *target, char *source) {
  63         int a, b;
  64         char hex[3];
  65         int target_length = 0;
  66
  67         strcpy(target, "");
  68
  69         for (a = 0; a < strlen(source); ++a) {
  70                 if (source[a] == '%') {
  71                         hex[0] = source[a + 1];
  72                         hex[1] = source[a + 2];
  73                         hex[2] = 0;
  74                         b = 0;
  75                         sscanf(hex, "%02x", &b);
  76                         target[target_length] = b;
  77                         target[++target_length] = 0;
  78                         a += 2;
  79                 }
  80                 else if (source[a] == '_') {
  81                         target[target_length] = ' ';
  82                         target[++target_length] = 0;
  83                 }
  84                 else if (source[a] == '-') {
  85                         target[target_length] = '-';
  86                         target[++target_length] = 0;
  87                 }
  88                 else {
  89                         target[target_length] = source[a];
  90                         target[++target_length] = 0;
  91                 }
  92         }
  93 }
  94
  95
  96
  97
  98 /*
  99  * Main entry point for GroupDAV requests
 100  */
 101 void groupdav_main(struct httprequest *req,
 102                         char *dav_content_type,
 103                         int dav_content_length,
 104                         char *dav_content
 105 ) {
 106         struct httprequest *rptr;
 107         char dav_method[256];
 108         char dav_pathname[256];
 109         char dav_ifmatch[256];
 110         char buf[256];
 111         char *ds;
 112         int i;
 113
 114         strcpy(dav_method, "");
 115         strcpy(dav_pathname, "");
 116         strcpy(dav_ifmatch, "");
 117
 118         for (rptr=req; rptr!=NULL; rptr=rptr->next) {
 119                 /* lprintf(9, "< %s\n", rptr->line); */
 120                 if (!strncasecmp(rptr->line, "Host: ", 6)) {
 121                         safestrncpy(WC->http_host, &rptr->line[6],
 122                                 sizeof WC->http_host);
 123                 }
 124                 if (!strncasecmp(rptr->line, "If-Match: ", 10)) {
 125                         safestrncpy(dav_ifmatch, &rptr->line[10],
 126                                 sizeof dav_ifmatch);
 127                 }
 128         }
 129
 130         if (!WC->logged_in) {
 131                 wprintf("HTTP/1.1 401 Unauthorized\r\n");
 132                 groupdav_common_headers();
 133                 wprintf("WWW-Authenticate: Basic realm=\"%s\"\r\n",
 134                         serv_info.serv_humannode);
 135                 wprintf("Content-Length: 0\r\n\r\n");
 136                 return;
 137         }
 138
 139         extract_token(dav_method, req->line, 0, ' ', sizeof dav_method);
 140         extract_token(dav_pathname, req->line, 1, ' ', sizeof dav_pathname);
 141         unescape_input(dav_pathname);
 142
 143         /* If the request does not begin with "/groupdav", prepend it.  If
 144          * we happen to introduce a double-slash, that's ok; we'll strip it
 145          * in the next step.
 146          */
 147         if (strncasecmp(dav_pathname, "/groupdav", 9)) {
 148                 snprintf(buf, sizeof buf, "/groupdav/%s", dav_pathname);
 149                 safestrncpy(dav_pathname, buf, sizeof dav_pathname);
 150         }
 151
 152         /* Remove any stray double-slashes in pathname */
 153         while (ds=strstr(dav_pathname, "//"), ds != NULL) {
 154                 strcpy(ds, ds+1);
 155         }
 156
 157         /*
 158          * If there's an If-Match: header, strip out the quotes if present, and
 159          * then if all that's left is an asterisk, make it go away entirely.
 160          */
 161         if (strlen(dav_ifmatch) > 0) {
 162                 striplt(dav_ifmatch);
 163                 if (dav_ifmatch[0] == '\"') {
 164                         strcpy(dav_ifmatch, &dav_ifmatch[1]);
 165                         for (i=0; i<strlen(dav_ifmatch); ++i) {
 166                                 if (dav_ifmatch[i] == '\"') {
 167                                         dav_ifmatch[i] = 0;
 168                                 }
 169                         }
 170                 }
 171                 if (!strcmp(dav_ifmatch, "*")) {
 172                         strcpy(dav_ifmatch, "");
 173                 }
 174         }
 175
 176         /*
 177          * The OPTIONS method is not required by GroupDAV.  This is an
 178          * experiment to determine what might be involved in supporting
 179          * other variants of DAV in the future.
 180          */
 181         if (!strcasecmp(dav_method, "OPTIONS")) {
 182                 groupdav_options(dav_pathname);
 183                 return;
 184         }
 185
 186         /*
 187          * The PROPFIND method is basically used to list all objects in a
 188          * room, or to list all relevant rooms on the server.
 189          */
 190         if (!strcasecmp(dav_method, "PROPFIND")) {
 191                 groupdav_propfind(dav_pathname);
 192                 return;
 193         }
 194
 195         /*
 196          * The GET method is used for fetching individual items.
 197          */
 198         if (!strcasecmp(dav_method, "GET")) {
 199                 groupdav_get(dav_pathname);
 200                 return;
 201         }
 202
 203         /*
 204          * The PUT method is used to add or modify items.
 205          */
 206         if (!strcasecmp(dav_method, "PUT")) {
 207                 groupdav_put(dav_pathname, dav_ifmatch,
 208                                 dav_content_type, dav_content);
 209                 return;
 210         }
 211
 212         /*
 213          * The DELETE method kills, maims, and destroys.
 214          */
 215         if (!strcasecmp(dav_method, "DELETE")) {
 216                 groupdav_delete(dav_pathname, dav_ifmatch);
 217                 return;
 218         }
 219
 220         /*
 221          * Couldn't find what we were looking for.  Die in a car fire.
 222          */
 223         wprintf("HTTP/1.1 501 Method not implemented\r\n");
 224         groupdav_common_headers();
 225         wprintf("Content-Type: text/plain\r\n"
 226                 "\r\n"
 227                 "GroupDAV method \"%s\" is not implemented.\r\n",
 228                 dav_method
 229         );
 230 }