webcit/groupdav_main.c

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