#ifndef PROJECT_H_INCLUDED #define PROJECT_H_INCLUDED /** Version string. */ #define PROJECT_H_VERSION "$Id: project.h,v 1.160 2010/10/10 09:58:12 fabiankeil Exp $" /********************************************************************* * * File : $Source: /cvsroot/ijbswa/current/project.h,v $ * * Purpose : Defines data structures which are widely used in the * project. Does not define any variables or functions * (though it does declare some macros). * * Copyright : Written by and Copyright (C) 2001-2010 the * Privoxy team. http://www.privoxy.org/ * * Based on the Internet Junkbuster originally written * by and Copyright (C) 1997 Anonymous Coders and * Junkbusters Corporation. http://www.junkbusters.com * * This program is free software; you can redistribute it * and/or modify it under the terms of the GNU General * Public License as published by the Free Software * Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will * be useful, but WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A * PARTICULAR PURPOSE. See the GNU General Public * License for more details. * * The GNU General Public License should be included with * this file. If not, you can view it at * http://www.gnu.org/copyleft/gpl.html * or write to the Free Software Foundation, Inc., 59 * Temple Place - Suite 330, Boston, MA 02111-1307, USA. * *********************************************************************/ /* Declare struct FILE for vars and funcs. */ #include /* Need time_t for file_list */ #include /* Needed for pcre choice */ #include "config.h" /* Need for struct sockaddr_storage */ #ifdef HAVE_RFC2553 # ifndef _WIN32 # include # include # else # include # include # include typedef unsigned short in_port_t; # endif #endif /* * Include appropriate regular expression libraries. * Note that pcrs and pcre (native) are needed for cgi * and are included anyway. */ #ifdef STATIC_PCRE # include "pcre.h" #else # ifdef PCRE_H_IN_SUBDIR # include # else # include # endif #endif #ifdef STATIC_PCRS # include "pcrs.h" #else # include #endif #ifdef STATIC_PCRE # include "pcreposix.h" #else # ifdef PCRE_H_IN_SUBDIR # include # else # include # endif #endif #ifdef AMIGA #include "amiga.h" #endif /* def AMIGA */ #ifdef _WIN32 /* * I don't want to have to #include all this just for the declaration * of SOCKET. However, it looks like we have to... */ #ifndef STRICT #define STRICT #endif #include #endif #ifdef __cplusplus extern "C" { #endif #ifdef _WIN32 typedef SOCKET jb_socket; #define JB_INVALID_SOCKET INVALID_SOCKET #else /* ndef _WIN32 */ /** * The type used by sockets. On UNIX it's an int. Microsoft decided to * make it an unsigned. */ typedef int jb_socket; /** * The error value used for variables of type jb_socket. On UNIX this * is -1, however Microsoft decided to make socket handles unsigned, so * they use a different value. */ #define JB_INVALID_SOCKET (-1) #endif /* ndef _WIN32 */ /** * A standard error code. This should be JB_ERR_OK or one of the JB_ERR_xxx * series of errors. */ typedef int jb_err; #define JB_ERR_OK 0 /**< Success, no error */ #define JB_ERR_MEMORY 1 /**< Out of memory */ #define JB_ERR_CGI_PARAMS 2 /**< Missing or corrupt CGI parameters */ #define JB_ERR_FILE 3 /**< Error opening, reading or writing a file */ #define JB_ERR_PARSE 4 /**< Error parsing file */ #define JB_ERR_MODIFIED 5 /**< File has been modified outside of the CGI actions editor. */ #define JB_ERR_COMPRESS 6 /**< Error on decompression */ /** * This macro is used to free a pointer that may be NULL. * It also sets the variable to NULL after it's been freed. * The paramater should be a simple variable without side effects. */ #define freez(X) { if(X) { free((void*)X); X = NULL ; } } /** * Fix a problem with Solaris. There should be no effect on other * platforms. * * Solaris's isspace() is a macro which uses it's argument directly * as an array index. Therefore we need to make sure that high-bit * characters generate +ve values, and ideally we also want to make * the argument match the declared parameter type of "int". * * Note: Remember to #include if you use these macros. */ #define ijb_toupper(__X) toupper((int)(unsigned char)(__X)) #define ijb_tolower(__X) tolower((int)(unsigned char)(__X)) #define ijb_isspace(__X) isspace((int)(unsigned char)(__X)) /** * Use for statically allocated buffers if you have no other choice. * Remember to check the length of what you write into the buffer * - we don't want any buffer overflows! */ #define BUFFER_SIZE 5000 /** * Max length of CGI parameters (arbitrary limit). */ #define CGI_PARAM_LEN_MAX 500U /** * Buffer size for capturing struct hostent data in the * gethostby(name|addr)_r library calls. Since we don't * loop over gethostbyname_r, the buffer must be sufficient * to accomodate multiple IN A RRs, as used in DNS round robin * load balancing. W3C's wwwlib uses 1K, so that should be * good enough for us, too. */ /** * XXX: Temporary doubled, for some configurations * 1K is still too small and we didn't get the * real fix ready for inclusion. */ #define HOSTENT_BUFFER_SIZE 2048 /** * Do not use. Originally this was so that you can * say "while (FOREVER) { ...do something... }". * However, this gives a warning with some compilers (e.g. VC++). * Instead, use "for (;;) { ...do something... }". */ #define FOREVER 1 /** * Default TCP/IP address to listen on, as a string. * Set to "127.0.0.1:8118". */ #define HADDR_DEFAULT "127.0.0.1:8118" /* Forward def for struct client_state */ struct configuration_spec; /** * Entry in a linked list of strings. */ struct list_entry { /** * The string pointer. It must point to a dynamically malloc()ed * string or be NULL for the list functions to work. In the latter * case, just be careful next time you iterate through the list in * your own code. */ char *str; /** Next entry in the linked list, or NULL if no more. */ struct list_entry *next; }; /** * A header for a linked list of strings. */ struct list { /** First entry in the list, or NULL if the list is empty. */ struct list_entry *first; /** Last entry in the list, or NULL if the list is empty. */ struct list_entry *last; }; /** * An entry in a map. This is a name=value pair. */ struct map_entry { /** The key for the map. */ const char *name; /** The value associated with that key. */ const char *value; /** The next map entry, or NULL if none. */ struct map_entry *next; }; /** * A map from a string to another string. * This is used for the paramaters passed in a HTTP GET request, and * to store the exports when the CGI interface is filling in a template. */ struct map { /** The first map entry, or NULL if the map is empty. */ struct map_entry *first; /** The last map entry, or NULL if the map is empty. */ struct map_entry *last; }; /** * A HTTP request. This includes the method (GET, POST) and * the parsed URL. * * This is also used whenever we want to match a URL against a * URL pattern. This always contains the URL to match, and never * a URL pattern. (See struct url_spec). */ struct http_request { char *cmd; /**< Whole command line: method, URL, Version */ char *ocmd; /**< Backup of original cmd for CLF logging */ char *gpc; /**< HTTP method: GET, POST, ... */ char *url; /**< The URL */ char *ver; /**< Protocol version */ int status; /**< HTTP Status */ char *host; /**< Host part of URL */ int port; /**< Port of URL or 80 (default) */ char *path; /**< Path of URL */ char *hostport; /**< host[:port] */ int ssl; /**< Flag if protocol is https */ char *host_ip_addr_str; /**< String with dotted decimal representation of host's IP. NULL before connect_to() */ #ifndef FEATURE_EXTENDED_HOST_PATTERNS char *dbuffer; /**< Buffer with '\0'-delimited domain name. */ char **dvec; /**< List of pointers to the strings in dbuffer. */ int dcount; /**< How many parts to this domain? (length of dvec) */ #endif /* ndef FEATURE_EXTENDED_HOST_PATTERNS */ }; /** * Reasons for generating a http_response instead of delivering * the requested resource. Mostly ordered the way they are checked * for in chat(). */ enum crunch_reason { UNSUPPORTED, BLOCKED, UNTRUSTED, REDIRECTED, CGI_CALL, NO_SUCH_DOMAIN, FORWARDING_FAILED, CONNECT_FAILED, OUT_OF_MEMORY, INTERNAL_ERROR, CONNECTION_TIMEOUT, NO_SERVER_DATA }; /** * Response generated by CGI, blocker, or error handler */ struct http_response { enum crunch_reason crunch_reason; /**< Why the response was generated in the first place. */ char *status; /**< HTTP status (string). */ struct list headers[1]; /**< List of header lines. */ char *head; /**< Formatted http response head. */ size_t head_length; /**< Length of http response head. */ char *body; /**< HTTP document body. */ size_t content_length; /**< Length of body, REQUIRED if binary body. */ int is_static; /**< Nonzero if the content will never change and should be cached by the browser (e.g. images). */ }; /** * A URL or a tag pattern. */ struct url_spec { /** The string which was parsed to produce this url_spec. Used for debugging or display only. */ char *spec; #ifdef FEATURE_EXTENDED_HOST_PATTERNS regex_t *host_regex;/**< Regex for host matching */ #else char *dbuffer; /**< Buffer with '\0'-delimited domain name, or NULL to match all hosts. */ char **dvec; /**< List of pointers to the strings in dbuffer. */ int dcount; /**< How many parts to this domain? (length of dvec) */ int unanchored; /**< Bitmap - flags are ANCHOR_LEFT and ANCHOR_RIGHT. */ #endif /* defined FEATURE_EXTENDED_HOST_PATTERNS */ char *port_list; /**< List of acceptable ports, or NULL to match all ports */ regex_t *preg; /**< Regex for matching path part */ regex_t *tag_regex; /**< Regex for matching tags */ }; /** * If you declare a static url_spec, this is the value to initialize it to zero. */ #ifndef FEATURE_EXTENDED_HOST_PATTERNS #define URL_SPEC_INITIALIZER { NULL, NULL, NULL, 0, 0, NULL, NULL, NULL } #else #define URL_SPEC_INITIALIZER { NULL, NULL, NULL, NULL, NULL } #endif /* def FEATURE_EXTENDED_HOST_PATTERNS */ /** * Constant for host part matching in URLs. If set, indicates that the start of * the pattern must match the start of the URL. E.g. this is not set for the * pattern ".example.com", so that it will match both "example.com" and * "www.example.com". It is set for the pattern "example.com", which makes it * match "example.com" only, not "www.example.com". */ #define ANCHOR_LEFT 1 /** * Constant for host part matching in URLs. If set, indicates that the end of * the pattern must match the end of the URL. E.g. this is not set for the * pattern "ad.", so that it will match any host called "ad", irrespective * of how many subdomains are in the fully-qualified domain name. */ #define ANCHOR_RIGHT 2 /** * An I/O buffer. Holds a string which can be appended to, and can have data * removed from the beginning. */ struct iob { char *buf; /**< Start of buffer */ char *cur; /**< Start of relevant data */ char *eod; /**< End of relevant data */ size_t size; /**< Size as malloc()ed */ }; /** * Return the number of bytes in the I/O buffer associated with the passed * client_state pointer. * May be zero. */ #define IOB_PEEK(CSP) ((CSP->iob->cur > CSP->iob->eod) ? (CSP->iob->eod - CSP->iob->cur) : 0) /** * Remove any data in the I/O buffer associated with the passed * client_state pointer. */ #define IOB_RESET(CSP) if(CSP->iob->buf) free(CSP->iob->buf); memset(CSP->iob, '\0', sizeof(CSP->iob)); /* Bits for csp->content_type bitmask: */ #define CT_TEXT 0x0001U /**< Suitable for pcrs filtering. */ #define CT_GIF 0x0002U /**< Suitable for GIF filtering. */ #define CT_TABOO 0x0004U /**< DO NOT filter, irrespective of other flags. */ /* Although these are not, strictly speaking, content types * (they are content encodings), it is simple to handle them * as such. */ #define CT_GZIP 0x0010U /**< gzip-compressed data. */ #define CT_DEFLATE 0x0020U /**< zlib-compressed data. */ /** * Flag to signal that the server declared the content type, * so we can differentiate between unknown and undeclared * content types. */ #define CT_DECLARED 0x0040U /** * The mask which includes all actions. */ #define ACTION_MASK_ALL (~0UL) /** * The most compatible set of actions - i.e. none. */ #define ACTION_MOST_COMPATIBLE 0x00000000UL /** Action bitmap: Block the request. */ #define ACTION_BLOCK 0x00000001UL /** Action bitmap: Deanimate if it's a GIF. */ #define ACTION_DEANIMATE 0x00000002UL /** Action bitmap: Downgrade HTTP/1.1 to 1.0. */ #define ACTION_DOWNGRADE 0x00000004UL /** Action bitmap: Fast redirects. */ #define ACTION_FAST_REDIRECTS 0x00000008UL /** Action bitmap: Remove or add "X-Forwarded-For" header. */ #define ACTION_CHANGE_X_FORWARDED_FOR 0x00000010UL /** Action bitmap: Hide "From" header. */ #define ACTION_HIDE_FROM 0x00000020UL /** Action bitmap: Hide "Referer" header. (sic - follow HTTP, not English). */ #define ACTION_HIDE_REFERER 0x00000040UL /** Action bitmap: Hide "User-Agent" and similar headers. */ #define ACTION_HIDE_USER_AGENT 0x00000080UL /** Action bitmap: This is an image. */ #define ACTION_IMAGE 0x00000100UL /** Action bitmap: Sets the image blocker. */ #define ACTION_IMAGE_BLOCKER 0x00000200UL /** Action bitmap: Prevent compression. */ #define ACTION_NO_COMPRESSION 0x00000400UL /** Action bitmap: Change cookies to session only cookies. */ #define ACTION_NO_COOKIE_KEEP 0x00000800UL /** Action bitmap: Block rending cookies. */ #define ACTION_NO_COOKIE_READ 0x00001000UL /** Action bitmap: Block setting cookies. */ #define ACTION_NO_COOKIE_SET 0x00002000UL /** Action bitmap: Override the forward settings in the config file */ #define ACTION_FORWARD_OVERRIDE 0x00004000UL /** Action bitmap: Block as empty document */ #define ACTION_HANDLE_AS_EMPTY_DOCUMENT 0x00008000UL /** Action bitmap: Limit CONNECT requests to safe ports. */ #define ACTION_LIMIT_CONNECT 0x00010000UL /** Action bitmap: Redirect request. */ #define ACTION_REDIRECT 0x00020000UL /** Action bitmap: Crunch or modify "if-modified-since" header. */ #define ACTION_HIDE_IF_MODIFIED_SINCE 0x00040000UL /** Action bitmap: Overwrite Content-Type header. */ #define ACTION_CONTENT_TYPE_OVERWRITE 0x00080000UL /** Action bitmap: Crunch specified server header. */ #define ACTION_CRUNCH_SERVER_HEADER 0x00100000UL /** Action bitmap: Crunch specified client header */ #define ACTION_CRUNCH_CLIENT_HEADER 0x00200000UL /** Action bitmap: Enable text mode by force */ #define ACTION_FORCE_TEXT_MODE 0x00400000UL /** Action bitmap: Enable text mode by force */ #define ACTION_CRUNCH_IF_NONE_MATCH 0x00800000UL /** Action bitmap: Enable content-dispostion crunching */ #define ACTION_HIDE_CONTENT_DISPOSITION 0x01000000UL /** Action bitmap: Replace or block Last-Modified header */ #define ACTION_OVERWRITE_LAST_MODIFIED 0x02000000UL /** Action bitmap: Replace or block Accept-Language header */ #define ACTION_HIDE_ACCEPT_LANGUAGE 0x04000000UL /** Action string index: How to deanimate GIFs */ #define ACTION_STRING_DEANIMATE 0 /** Action string index: Replacement for "From:" header */ #define ACTION_STRING_FROM 1 /** Action string index: How to block images */ #define ACTION_STRING_IMAGE_BLOCKER 2 /** Action string index: Replacement for "Referer:" header */ #define ACTION_STRING_REFERER 3 /** Action string index: Replacement for "User-Agent:" header */ #define ACTION_STRING_USER_AGENT 4 /** Action string index: Legal CONNECT ports. */ #define ACTION_STRING_LIMIT_CONNECT 5 /** Action string index: Server headers containing this pattern are crunched*/ #define ACTION_STRING_SERVER_HEADER 6 /** Action string index: Client headers containing this pattern are crunched*/ #define ACTION_STRING_CLIENT_HEADER 7 /** Action string index: Replacement for the "Accept-Language:" header*/ #define ACTION_STRING_LANGUAGE 8 /** Action string index: Replacement for the "Content-Type:" header*/ #define ACTION_STRING_CONTENT_TYPE 9 /** Action string index: Replacement for the "content-dispostion:" header*/ #define ACTION_STRING_CONTENT_DISPOSITION 10 /** Action string index: Replacement for the "If-Modified-Since:" header*/ #define ACTION_STRING_IF_MODIFIED_SINCE 11 /** Action string index: Replacement for the "Last-Modified:" header. */ #define ACTION_STRING_LAST_MODIFIED 12 /** Action string index: Redirect URL */ #define ACTION_STRING_REDIRECT 13 /** Action string index: Decode before redirect? */ #define ACTION_STRING_FAST_REDIRECTS 14 /** Action string index: Overriding forward rule. */ #define ACTION_STRING_FORWARD_OVERRIDE 15 /** Action string index: Reason for the block. */ #define ACTION_STRING_BLOCK 16 /** Action string index: what to do with the "X-Forwarded-For" header. */ #define ACTION_STRING_CHANGE_X_FORWARDED_FOR 17 /** Number of string actions. */ #define ACTION_STRING_COUNT 18 /* To make the ugly hack in sed easier to understand */ #define CHECK_EVERY_HEADER_REMAINING 0 /** Index into current_action_spec::multi[] for headers to add. */ #define ACTION_MULTI_ADD_HEADER 0 /** Index into current_action_spec::multi[] for content filters to apply. */ #define ACTION_MULTI_FILTER 1 /** Index into current_action_spec::multi[] for server-header filters to apply. */ #define ACTION_MULTI_SERVER_HEADER_FILTER 2 /** Index into current_action_spec::multi[] for client-header filters to apply. */ #define ACTION_MULTI_CLIENT_HEADER_FILTER 3 /** Index into current_action_spec::multi[] for client-header tags to apply. */ #define ACTION_MULTI_CLIENT_HEADER_TAGGER 4 /** Index into current_action_spec::multi[] for server-header tags to apply. */ #define ACTION_MULTI_SERVER_HEADER_TAGGER 5 /** Number of multi-string actions. */ #define ACTION_MULTI_COUNT 6 /** * This structure contains a list of actions to apply to a URL. * It only contains positive instructions - no "-" options. * It is not used to store the actions list itself, only for * url_actions() to return the current values. */ struct current_action_spec { /** Actions to apply. A bit set to "1" means perform the action. */ unsigned long flags; /** * Paramaters for those actions that require them. * Each entry is valid if & only if the corresponding entry in "flags" is * set. */ char * string[ACTION_STRING_COUNT]; /** Lists of strings for multi-string actions. */ struct list multi[ACTION_MULTI_COUNT][1]; }; /** * This structure contains a set of changes to actions. * It can contain both positive and negative instructions. * It is used to store an entry in the actions list. */ struct action_spec { unsigned long mask; /**< Actions to keep. A bit set to "0" means remove action. */ unsigned long add; /**< Actions to add. A bit set to "1" means add action. */ /** * Paramaters for those actions that require them. * Each entry is valid if & only if the corresponding entry in "flags" is * set. */ char * string[ACTION_STRING_COUNT]; /** Lists of strings to remove, for multi-string actions. */ struct list multi_remove[ACTION_MULTI_COUNT][1]; /** If nonzero, remove *all* strings from the multi-string action. */ int multi_remove_all[ACTION_MULTI_COUNT]; /** Lists of strings to add, for multi-string actions. */ struct list multi_add[ACTION_MULTI_COUNT][1]; }; /** * This structure is used to store action files. * * It contains an URL or tag pattern, and the changes to * the actions. It's a linked list and should only be * free'd through unload_actions_file() unless there's * only a single entry. */ struct url_actions { struct url_spec url[1]; /**< The URL or tag pattern. */ struct action_spec *action; /**< Action settings that might be shared with the list entry before or after the current one and can't be free'd willy nilly. */ struct url_actions *next; /**< Next action section in file, or NULL. */ }; /* * Structure to hold the server socket and the information * required to make sure we only reuse the connection if * the host and forwarding settings are the same. */ struct reusable_connection { jb_socket sfd; int in_use; time_t timestamp; /* XXX: rename? */ time_t request_sent; time_t response_received; /* * Number of seconds after which this * connection will no longer be reused. */ unsigned int keep_alive_timeout; char *host; int port; int forwarder_type; char *gateway_host; int gateway_port; char *forward_host; int forward_port; }; /* * Flags for use in csp->flags */ /** * Flag for csp->flags: Set if this client is processing data. * Cleared when the thread associated with this structure dies. */ #define CSP_FLAG_ACTIVE 0x01U /** * Flag for csp->flags: Set if the server's reply is in "chunked" * transfer encoding */ #define CSP_FLAG_CHUNKED 0x02U /** * Flag for csp->flags: Set if this request was enforced, although it would * normally have been blocked. */ #define CSP_FLAG_FORCED 0x04U /** * Flag for csp->flags: Set if any modification to the body was done. */ #define CSP_FLAG_MODIFIED 0x08U /** * Flag for csp->flags: Set if request was blocked. */ #define CSP_FLAG_REJECTED 0x10U /** * Flag for csp->flags: Set if we are toggled on (FEATURE_TOGGLE). */ #define CSP_FLAG_TOGGLED_ON 0x20U /** * Flag for csp->flags: Set if we answered the request ourselve. */ #define CSP_FLAG_CRUNCHED 0x40U /** * Flag for csp->flags: Set if an acceptable Connection header * has already been set by the client. */ #define CSP_FLAG_CLIENT_CONNECTION_HEADER_SET 0x00000040U /** * Flag for csp->flags: Set if an acceptable Connection header * has already been set by the server. */ #define CSP_FLAG_SERVER_CONNECTION_HEADER_SET 0x00000080U /** * Flag for csp->flags: Signals header parsers whether they * are parsing server or client headers. */ #define CSP_FLAG_CLIENT_HEADER_PARSING_DONE 0x00000100U /** * Flag for csp->flags: Set if adding the Host: header * isn't necessary. */ #define CSP_FLAG_HOST_HEADER_IS_SET 0x00000200U /** * Flag for csp->flags: Set if filtering is disabled by X-Filter: No * XXX: As we now have tags we might as well ditch this. */ #define CSP_FLAG_NO_FILTERING 0x00000400U /** * Flag for csp->flags: Set the client IP has appended to * an already existing X-Forwarded-For header in which case * no new header has to be generated. */ #define CSP_FLAG_X_FORWARDED_FOR_APPENDED 0x00000800U /** * Flag for csp->flags: Set if the server wants to keep * the connection alive. */ #define CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE 0x00001000U #ifdef FEATURE_CONNECTION_KEEP_ALIVE /** * Flag for csp->flags: Set if the server specified the * content length. */ #define CSP_FLAG_SERVER_CONTENT_LENGTH_SET 0x00002000U /** * Flag for csp->flags: Set if we know the content lenght, * either because the server set it, or we figured it out * on our own. */ #define CSP_FLAG_CONTENT_LENGTH_SET 0x00004000U /** * Flag for csp->flags: Set if the client wants to keep * the connection alive. */ #define CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE 0x00008000U /** * Flag for csp->flags: Set if we think we got the whole * client request and shouldn't read any additional data * coming from the client until the current request has * been dealt with. */ #define CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ 0x00010000U /** * Flag for csp->flags: Set if the server promised us to * keep the connection open for a known number of seconds. */ #define CSP_FLAG_SERVER_KEEP_ALIVE_TIMEOUT_SET 0x00020000U #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */ /** * Flag for csp->flags: Set if we think we can't reuse * the server socket. */ #define CSP_FLAG_SERVER_SOCKET_TAINTED 0x00040000U /** * Flag for csp->flags: Set if the Proxy-Connection header * is among the server headers. */ #define CSP_FLAG_SERVER_PROXY_CONNECTION_HEADER_SET 0x00080000U /** * Flag for csp->flags: Set if the client reused its connection. */ #define CSP_FLAG_REUSED_CLIENT_CONNECTION 0x00100000U /* * Flags for use in return codes of child processes */ /** * Flag for process return code: Set if exiting porcess has been toggled * during its lifetime. */ #define RC_FLAG_TOGGLED 0x10 /** * Flag for process return code: Set if exiting porcess has blocked its * request. */ #define RC_FLAG_BLOCKED 0x20 /** * Maximum number of actions/filter files. This limit is arbitrary - it's just used * to size an array. */ #define MAX_AF_FILES 10 /** * The state of a Privoxy processing thread. */ struct client_state { /** The proxy's configuration */ struct configuration_spec * config; /** The actions to perform on the current request */ struct current_action_spec action[1]; /** socket to talk to client (web browser) */ jb_socket cfd; /** current connection to the server (may go through a proxy) */ struct reusable_connection server_connection; /** Multi-purpose flag container, see CSP_FLAG_* above */ unsigned int flags; /** Client PC's IP address, as reported by the accept() function. As a string. */ char *ip_addr_str; #ifdef HAVE_RFC2553 /** Client PC's TCP address, as reported by the accept() function. As a sockaddr. */ struct sockaddr_storage tcp_addr; #else /** Client PC's IP address, as reported by the accept() function. As a number. */ unsigned long ip_addr_long; #endif /* def HAVE_RFC2553 */ /** The URL that was requested */ struct http_request http[1]; /* * The final forwarding settings. * XXX: Currently this is only used for forward-override, * so we can free the space in sweep. */ struct forward_spec * fwd; /** An I/O buffer used for buffering data read from the network */ struct iob iob[1]; /** List of all headers for this request */ struct list headers[1]; /** List of all tags that apply to this request */ struct list tags[1]; /** MIME-Type key, see CT_* above */ unsigned int content_type; /** Actions files associated with this client */ struct file_list *actions_list[MAX_AF_FILES]; /** pcrs job files. */ struct file_list *rlist[MAX_AF_FILES]; /** Length after content modification. */ unsigned long long content_length; #ifdef FEATURE_CONNECTION_KEEP_ALIVE /* XXX: is this the right location? */ /** Expected length of content after which we * should stop reading from the server socket. */ unsigned long long expected_content_length; /** Expected length of content after which we * should stop reading from the client socket. */ unsigned long long expected_client_content_length; #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */ #ifdef FEATURE_TRUST /** Trust file. */ struct file_list *tlist; #endif /* def FEATURE_TRUST */ /** * Failure reason to embedded in the CGI error page, * or NULL. Currently only used for socks errors. */ char *error_message; }; /** * List of client states so the main thread can keep * track of them and garbage collect their resources. */ struct client_states { struct client_states *next; struct client_state csp; }; /** * A function to add a header */ typedef jb_err (*add_header_func_ptr)(struct client_state *); /** * A function to process a header */ typedef jb_err (*parser_func_ptr )(struct client_state *, char **); /** * List of available CGI functions. */ struct cgi_dispatcher { /** The URL of the CGI, relative to the CGI root. */ const char * const name; /** The handler function for the CGI */ jb_err (* const handler)(struct client_state *csp, struct http_response *rsp, const struct map *parameters); /** The description of the CGI, to appear on the main menu, or NULL to hide it. */ const char * const description; /** A flag that indicates whether unintentional calls to this CGI can cause damage */ int harmless; }; /** * A data file used by Privoxy. Kept in a linked list. */ struct file_list { /** * This is a pointer to the data structures associated with the file. * Read-only once the structure has been created. */ void *f; /** * The unloader function. * Normally NULL. When we are finished with file (i.e. when we have * loaded a new one), set to a pointer to an unloader function. * Unloader will be called by sweep() (called from main loop) when * all clients using this file are done. This prevents threading * problems. */ void (*unloader)(void *); /** * Used internally by sweep(). Do not access from elsewhere. */ int active; /** * File last-modified time, so we can check if file has been changed. * Read-only once the structure has been created. */ time_t lastmodified; /** * The full filename. */ char * filename; /** * Pointer to next entry in the linked list of all "file_list"s. * This linked list is so that sweep() can navigate it. * Since sweep() can remove items from the list, we must be careful * to only access this value from main thread (when we know sweep * won't be running). */ struct file_list *next; }; #ifdef FEATURE_TRUST /** * The format of a trust file when loaded into memory. */ struct block_spec { struct url_spec url[1]; /**< The URL pattern */ int reject; /**< FIXME: Please document this! */ struct block_spec *next; /**< Next entry in linked list */ }; /** * Arbitrary limit for the number of trusted referrers. */ #define MAX_TRUSTED_REFERRERS 512 #endif /* def FEATURE_TRUST */ #define SOCKS_NONE 0 /**< Don't use a SOCKS server */ #define SOCKS_4 40 /**< original SOCKS 4 protocol */ #define SOCKS_4A 41 /**< as modified for hosts w/o external DNS */ #define SOCKS_5 50 /**< as modified for hosts w/o external DNS */ /** * How to forward a connection to a parent proxy. */ struct forward_spec { /** URL pattern that this forward_spec is for. */ struct url_spec url[1]; /** Connection type. Must be SOCKS_NONE, SOCKS_4, SOCKS_4A or SOCKS_5. */ int type; /** SOCKS server hostname. Only valid if "type" is SOCKS_4 or SOCKS_4A. */ char *gateway_host; /** SOCKS server port. */ int gateway_port; /** Parent HTTP proxy hostname, or NULL for none. */ char *forward_host; /** Parent HTTP proxy port. */ int forward_port; /** Next entry in the linked list. */ struct forward_spec *next; }; /** * Initializer for a static struct forward_spec. */ #define FORWARD_SPEC_INITIALIZER { { URL_SPEC_INITIALIZER }, 0, NULL, 0, NULL, 0, NULL } /* Supported filter types */ enum filter_type { FT_CONTENT_FILTER = 0, FT_CLIENT_HEADER_FILTER = 1, FT_SERVER_HEADER_FILTER = 2, FT_CLIENT_HEADER_TAGGER = 3, FT_SERVER_HEADER_TAGGER = 4, }; #define MAX_FILTER_TYPES 5 /** * This struct represents one filter (one block) from * the re_filterfile. If there is more than one filter * in the file, the file will be represented by a * chained list of re_filterfile specs. */ struct re_filterfile_spec { char *name; /**< Name from FILTER: statement in re_filterfile. */ char *description; /**< Description from FILTER: statement in re_filterfile. */ struct list patterns[1]; /**< The patterns from the re_filterfile. */ pcrs_job *joblist; /**< The resulting compiled pcrs_jobs. */ enum filter_type type; /**< Filter type (content, client-header, server-header). */ int dynamic; /**< Set to one if the pattern might contain variables and has to be recompiled for every request. */ struct re_filterfile_spec *next; /**< The pointer for chaining. */ }; #ifdef FEATURE_ACL #define ACL_PERMIT 1 /**< Accept connection request */ #define ACL_DENY 2 /**< Reject connection request */ /** * An IP address pattern. Used to specify networks in the ACL. */ struct access_control_addr { #ifdef HAVE_RFC2553 struct sockaddr_storage addr; /*