src/errorpage.h

   1 /*
   2  * DEBUG: section 04    Error Generation
   3  * AUTHOR: Duane Wessels
   4  *
   5  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   6  * ----------------------------------------------------------
   7  *
   8  *  Squid is the result of efforts by numerous individuals from
   9  *  the Internet community; see the CONTRIBUTORS file for full
  10  *  details.   Many organizations have provided support for Squid's
  11  *  development; see the SPONSORS file for full details.  Squid is
  12  *  Copyrighted (C) 2001 by the Regents of the University of
  13  *  California; see the COPYRIGHT file for full details.  Squid
  14  *  incorporates software developed and/or copyrighted by other
  15  *  sources; see the CREDITS file for full details.
  16  *
  17  *  This program is free software; you can redistribute it and/or modify
  18  *  it under the terms of the GNU General Public License as published by
  19  *  the Free Software Foundation; either version 2 of the License, or
  20  *  (at your option) any later version.
  21  *
  22  *  This program is distributed in the hope that it will be useful,
  23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *  GNU General Public License for more details.
  26  *
  27  *  You should have received a copy of the GNU General Public License
  28  *  along with this program; if not, write to the Free Software
  29  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  30  *
  31  * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
  32  */
  33
  34 #ifndef   SQUID_ERRORPAGE_H
  35 #define   SQUID_ERRORPAGE_H
  36
  37 #include "squid.h"
  38 #if USE_AUTH
  39 #include "auth/UserRequest.h"
  40 #endif
  41 #include "cbdata.h"
  42 #include "ip/Address.h"
  43 #if USE_SSL
  44 #include "ssl/ErrorDetail.h"
  45 #endif
  46
  47 /**
  48  \defgroup ErrorPageAPI Error Pages API
  49  \ingroup Components
  50  \section ErrorPageStringCodes Error Page % codes for text insertion.
  51  *
  52  \verbatim
  53    a - User identity                            x
  54    B - URL with FTP %2f hack                    x
  55    c - Squid error code                         x
  56    d - seconds elapsed since request received   x
  57    D - Error details                            x
  58    e - errno                                    x
  59    E - strerror()                               x
  60    f - FTP request line                         x
  61    F - FTP reply line                           x
  62    g - FTP server message                       x
  63    h - cache hostname                           x
  64    H - server host name                         x
  65    i - client IP address                        x
  66    I - server IP address                        x
  67    l - HREF link for CSS stylesheet inclusion   x
  68    L - HREF link for more info/contact          x
  69    M - Request Method                           x
  70    m - Error message returned by auth helper    x
  71    o - Message returned external acl helper     x
  72    p - URL port #                               x
  73    P - Protocol                                 x
  74    R - Full HTTP Request                        x
  75    S - squid signature from ERR_SIGNATURE       x
  76    s - caching proxy software with version      x
  77    t - local time                               x
  78    T - UTC                                      x
  79    U - URL without password                     x
  80    u - URL with password                        x
  81    w - cachemgr email address                   x
  82    W - error data (to be included in the mailto links)
  83    z - dns server error message                 x
  84    Z - Preformatted error message               x
  85  \endverbatim
  86  */
  87
  88 class HttpReply;
  89 class MemBuf;
  90
  91 /// \ingroup ErrorPageAPI
  92 class ErrorState
  93 {
  94 public:
  95     /**
  96      * Allocates and initializes an error response
  97      */
  98     HttpReply *BuildHttpReply(void);
  99
 100 private:
 101     /**
 102      * Locates error page template to be used for this error
 103      * and constructs the HTML page content from it.
 104      */
 105     MemBuf *BuildContent(void);
 106
 107     /**
 108      * Convert the given template string into textual output
 109      *
 110      * \param text            The string to be converted
 111      * \param allowRecursion  Whether to convert codes which output may contain codes
 112      */
 113     MemBuf *ConvertText(const char *text, bool allowRecursion);
 114
 115     /**
 116      * Generates the Location: header value for a deny_info error page
 117      * to be used for this error.
 118      */
 119     void DenyInfoLocation(const char *name, HttpRequest *request, MemBuf &result);
 120
 121     /**
 122      * Map the Error page and deny_info template % codes into textual output.
 123      *
 124      * Several of the codes produce blocks of non-URL compatible results.
 125      * When processing the deny_info location URL they will be skipped.
 126      *
 127      * \param token                    The token following % which need to be converted
 128      * \param building_deny_info_url   Perform special deny_info actions, such as URL-encoding and token skipping.
 129      * \ allowRecursion   True if the codes which do recursions should converted
 130      */
 131     const char *Convert(char token, bool building_deny_info_url, bool allowRecursion);
 132
 133     /**
 134      * CacheManager / Debug dump of the ErrorState object.
 135      * Writes output into the given MemBuf.
 136      \retval 0 successful completion.
 137      */
 138     int Dump(MemBuf * mb);
 139
 140 public:
 141     err_type type;
 142     int page_id;
 143     char *err_language;
 144     http_status httpStatus;
 145 #if USE_AUTH
 146     AuthUserRequest::Pointer auth_user_request;
 147 #endif
 148     HttpRequest *request;
 149     char *url;
 150     int xerrno;
 151     u_short port;
 152     String dnsError; ///< DNS lookup error message
 153     time_t ttl;
 154
 155     Ip::Address src_addr;
 156     char *redirect_url;
 157     ERCB *callback;
 158     void *callback_data;
 159
 160     struct {
 161         unsigned int flag_cbdata:1;
 162     } flags;
 163
 164     struct {
 165         wordlist *server_msg;
 166         char *request;
 167         char *reply;
 168         char *cwd_msg;
 169         MemBuf *listing;
 170     } ftp;
 171
 172     char *request_hdrs;
 173     char *err_msg; /* Preformatted error message from the cache */
 174
 175 #if USE_SSL
 176     Ssl::ErrorDetail *detail;
 177 #endif
 178 private:
 179     CBDATA_CLASS2(ErrorState);
 180 };
 181
 182 /**
 183  \ingroup ErrorPageAPI
 184  *
 185  * This function finds the error messages formats, and stores
 186  * them in error_text[]
 187  *
 188  \par Global effects:
 189  *            error_text[] - is modified
 190  */
 191 SQUIDCEXTERN void errorInitialize(void);
 192
 193 /// \ingroup ErrorPageAPI
 194 SQUIDCEXTERN void errorClean(void);
 195
 196 /**
 197  \ingroup ErrorPageAPI
 198  *
 199  * This function generates a error page from the info contained
 200  * by err and then sends it to the client.
 201  * The callback function errorSendComplete() is called after
 202  * the page has been written to the client socket (fd).
 203  * errorSendComplete() deallocates err.  We need to add
 204  * err to the cbdata because comm_write() requires it
 205  * for all callback data pointers.
 206  *
 207  \note normally errorSend() should only be called from
 208  *     routines in ssl.c and pass.c, where we don't have any
 209  *     StoreEntry's.  In client_side.c we must allocate a StoreEntry
 210  *     for errors and use errorAppendEntry() to account for
 211  *     persistent/pipeline connections.
 212  *
 213  \param fd      socket where page object is to be written
 214  \param err     This object is destroyed after use in this function.
 215  */
 216 SQUIDCEXTERN void errorSend(int fd, ErrorState *err);
 217
 218 /**
 219  \ingroup ErrorPageAPI
 220  *
 221  * This function generates a error page from the info contained
 222  * by err and then stores the text in the specified store
 223  * entry.
 224  * This function should only be called by "server
 225  * side routines" which need to communicate errors to the
 226  * client side.  It should also be called from client_side.c
 227  * because we now support persistent connections, and
 228  * cannot assume that we can immediately write to the socket
 229  * for an error.
 230  *
 231  \param entry   ??
 232  \param err     This object is destroyed after use in this function.
 233  */
 234 SQUIDCEXTERN void errorAppendEntry(StoreEntry *entry, ErrorState *err);
 235
 236 /// \ingroup ErrorPageAPI
 237 SQUIDCEXTERN void errorStateFree(ErrorState * err);
 238
 239 /// \ingroup ErrorPageAPI
 240 SQUIDCEXTERN err_type errorReservePageId(const char *page_name);
 241
 242 /**
 243  \ingroup ErrorPageAPI
 244  *
 245  * This function creates a ErrorState object.
 246  */
 247 SQUIDCEXTERN ErrorState *errorCon(err_type type, http_status, HttpRequest * request);
 248 SQUIDCEXTERN const char *errorPageName(int pageId); ///< error ID to string
 249
 250 #endif /* SQUID_ERRORPAGE_H */