const char parsers_rcs[] = "$Id: parsers.c,v 1.10 2001/05/29 09:50:24 jongfoster Exp $"; /********************************************************************* * * File : $Source: /cvsroot/ijbswa/current/parsers.c,v $ * * Purpose : Declares functions to parse/crunch headers and pages. * Functions declared include: * `add_to_iob', `client_cookie_adder', `client_from', * `client_referrer', `client_send_cookie', `client_ua', * `client_uagent', `client_x_forwarded', * `client_x_forwarded_adder', `client_xtra_adder', * `content_type', `crumble', `destroy_list', `enlist', * `flush_socket', `free_http_request', `get_header', * `list_to_text', `parse_http_request', `sed', * and `server_set_cookie'. * * Copyright : Written by and Copyright (C) 2001 the SourceForge * IJBSWA team. http://ijbswa.sourceforge.net * * 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. * * Revisions : * $Log: parsers.c,v $ * Revision 1.10 2001/05/29 09:50:24 jongfoster * Unified blocklist/imagelist/permissionslist. * File format is still under discussion, but the internal changes * are (mostly) done. * * Also modified interceptor behaviour: * - We now intercept all URLs beginning with one of the following * prefixes (and *only* these prefixes): * * http://i.j.b/ * * http://ijbswa.sf.net/config/ * * http://ijbswa.sourceforge.net/config/ * - New interceptors "home page" - go to http://i.j.b/ to see it. * - Internal changes so that intercepted and fast redirect pages * are not replaced with an image. * - Interceptors now have the option to send a binary page direct * to the client. (i.e. ijb-send-banner uses this) * - Implemented show-url-info interceptor. (Which is why I needed * the above interceptors changes - a typical URL is * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif". * The previous mechanism would not have intercepted that, and * if it had been intercepted then it then it would have replaced * it with an image.) * * Revision 1.9 2001/05/28 17:26:33 jongfoster * Fixing segfault if last header was crunched. * Fixing Windows build (snprintf() is _snprintf() under Win32, but we * can use the cross-platform sprintf() instead.) * * Revision 1.8 2001/05/27 22:17:04 oes * * - re_process_buffer no longer writes the modified buffer * to the client, which was very ugly. It now returns the * buffer, which it is then written by chat. * * - content_length now adjusts the Content-Length: header * for modified documents rather than crunch()ing it. * (Length info in csp->content_length, which is 0 for * unmodified documents) * * - For this to work, sed() is called twice when filtering. * * Revision 1.7 2001/05/27 13:19:06 oes * Patched Joergs solution for the content-length in. * * Revision 1.6 2001/05/26 13:39:32 jongfoster * Only crunches Content-Length header if applying RE filtering. * Without this fix, Microsoft Windows Update wouldn't work. * * Revision 1.5 2001/05/26 00:28:36 jongfoster * Automatic reloading of config file. * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32). * Most of the global variables have been moved to a new * struct configuration_spec, accessed through csp->config->globalname * Most of the globals remaining are used by the Win32 GUI. * * Revision 1.4 2001/05/22 18:46:04 oes * * - Enabled filtering banners by size rather than URL * by adding patterns that replace all standard banner * sizes with the "Junkbuster" gif to the re_filterfile * * - Enabled filtering WebBugs by providing a pattern * which kills all 1x1 images * * - Added support for PCRE_UNGREEDY behaviour to pcrs, * which is selected by the (nonstandard and therefore * capital) letter 'U' in the option string. * It causes the quantifiers to be ungreedy by default. * Appending a ? turns back to greedy (!). * * - Added a new interceptor ijb-send-banner, which * sends back the "Junkbuster" gif. Without imagelist or * MSIE detection support, or if tinygif = 1, or the * URL isn't recognized as an imageurl, a lame HTML * explanation is sent instead. * * - Added new feature, which permits blocking remote * script redirects and firing back a local redirect * to the browser. * The feature is conditionally compiled, i.e. it * can be disabled with --disable-fast-redirects, * plus it must be activated by a "fast-redirects" * line in the config file, has its own log level * and of course wants to be displayed by show-proxy-args * Note: Boy, all the #ifdefs in 1001 locations and * all the fumbling with configure.in and acconfig.h * were *way* more work than the feature itself :-( * * - Because a generic redirect template was needed for * this, tinygif = 3 now uses the same. * * - Moved GIFs, and other static HTTP response templates * to project.h * * - Some minor fixes * * - Removed some >400 CRs again (Jon, you really worked * a lot! ;-) * * Revision 1.3 2001/05/20 01:21:20 jongfoster * Version 2.9.4 checkin. * - Merged popupfile and cookiefile, and added control over PCRS * filtering, in new "permissionsfile". * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration * file error you now get a message box (in the Win32 GUI) rather * than the program exiting with no explanation. * - Made killpopup use the PCRS MIME-type checking and HTTP-header * skipping. * - Removed tabs from "config" * - Moved duplicated url parsing code in "loaders.c" to a new funcition. * - Bumped up version number. * * Revision 1.2 2001/05/17 23:02:36 oes * - Made referrer option accept 'L' as a substitute for '§' * * Revision 1.1.1.1 2001/05/15 13:59:01 oes * Initial import of version 2.9.3 source tree * * *********************************************************************/ #include "config.h" #include #include #include #include #include #ifndef _WIN32 #include #endif #include "project.h" #include "parsers.h" #include "encode.h" #include "filters.h" #include "loaders.h" #include "showargs.h" #include "jcc.h" #include "ssplit.h" #include "errlog.h" #include "jbsockets.h" #include "miscutil.h" const char parsers_h_rcs[] = PARSERS_H_VERSION; /* 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". * * Why did they write a character function that can't take a simple * "char" argument? Doh! */ #define ijb_isupper(__X) isupper((int)(unsigned char)(__X)) #define ijb_tolower(__X) tolower((int)(unsigned char)(__X)) const struct parsers client_patterns[] = { { "referer:", 8, client_referrer }, { "user-agent:", 11, client_uagent }, { "ua-", 3, client_ua }, { "from:", 5, client_from }, { "cookie:", 7, client_send_cookie }, { "x-forwarded-for:", 16, client_x_forwarded }, { "proxy-connection:", 17, crumble }, #ifdef DENY_GZIP { "Accept-Encoding: gzip", 21, crumble }, #endif /* def DENY_GZIP */ #if defined(DETECT_MSIE_IMAGES) { "Accept:", 7, client_accept }, #endif /* defined(DETECT_MSIE_IMAGES) */ #ifdef FORCE_LOAD { "Host:", 5, client_host }, #endif /* def FORCE_LOAD */ /* { "if-modified-since:", 18, crumble }, */ { NULL, 0, NULL } }; const struct interceptors intercept_patterns[] = { { "show-proxy-args", 14, show_proxy_args }, { "ijb-send-banner", 14, ijb_send_banner }, #ifdef TRUST_FILES { "ij-untrusted-url", 15, ij_untrusted_url }, #endif /* def TRUST_FILES */ { "show-url-info", 13, ijb_show_url_info }, { NULL, 0, NULL } }; const struct parsers server_patterns[] = { { "set-cookie:", 11, server_set_cookie }, { "connection:", 11, crumble }, #if defined(PCRS) || defined(KILLPOPUPS) { "Content-Type:", 13, content_type }, #endif /* defined(PCRS) || defined(KILLPOPUPS) */ #ifdef PCRS { "Content-Length:", 15, content_length }, #endif /* def PCRS */ { NULL, 0, NULL } }; void (* const add_client_headers[])(struct client_state *) = { client_cookie_adder, client_x_forwarded_adder, client_xtra_adder, NULL }; void (* const add_server_headers[])(struct client_state *) = { NULL }; /********************************************************************* * * Function : flush_socket * * Description : Write any pending "buffered" content. * * Parameters : * 1 : fd = file descriptor of the socket to read * 2 : csp = Current client state (buffers, headers, etc...) * * Returns : On success, the number of bytes written are returned (zero * indicates nothing was written). On error, -1 is returned, * and errno is set appropriately. If count is zero and the * file descriptor refers to a regular file, 0 will be * returned without causing any other effect. For a special * file, the results are not portable. * *********************************************************************/ int flush_socket(int fd, struct client_state *csp) { struct iob *iob = csp->iob; int n = iob->eod - iob->cur; if (n <= 0) { return(0); } n = write_socket(fd, iob->cur, n); iob->eod = iob->cur = iob->buf; return(n); } /********************************************************************* * * Function : add_to_iob * * Description : Add content to the buffered page. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : buf = holds the content to be added to the page * 3 : n = number of bytes to be added * * Returns : Number of bytes in the content buffer. * *********************************************************************/ int add_to_iob(struct client_state *csp, char *buf, int n) { struct iob *iob = csp->iob; int have, need; char *p; have = iob->eod - iob->cur; if (n <= 0) { return(have); } need = have + n; if ((p = (char *)malloc(need + 1)) == NULL) { log_error(LOG_LEVEL_ERROR, "malloc() iob failed: %E"); return(-1); } if (have) { /* there is something in the buffer - save it */ memcpy(p, iob->cur, have); /* replace the buffer with the new space */ freez(iob->buf); iob->buf = p; /* point to the end of the data */ p += have; } else { /* the buffer is empty, free it and reinitialize */ freez(iob->buf); iob->buf = p; } /* copy the new data into the iob buffer */ memcpy(p, buf, n); /* point to the end of the data */ p += n; /* null terminate == cheap insurance */ *p = '\0'; /* set the pointers to the new values */ iob->cur = iob->buf; iob->eod = p; return(need); } /********************************************************************* * * Function : get_header * * Description : This (odd) routine will parse the csp->iob * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * * Returns : Any one of the following: * * 1) a pointer to a dynamically allocated string that contains a header line * 2) NULL indicating that the end of the header was reached * 3) "" indicating that the end of the iob was reached before finding * a complete header line. * *********************************************************************/ char *get_header(struct client_state *csp) { struct iob *iob; char *p, *q, *ret; iob = csp->iob; if ((iob->cur == NULL) || ((p = strchr(iob->cur, '\n')) == NULL)) { return(""); /* couldn't find a complete header */ } *p = '\0'; ret = strdup(iob->cur); iob->cur = p+1; if ((q = strchr(ret, '\r'))) *q = '\0'; /* is this a blank linke (i.e. the end of the header) ? */ if (*ret == '\0') { freez(ret); return(NULL); } return(ret); } /********************************************************************* * * Function : enlist * * Description : Append a string into a specified string list. * * Parameters : * 1 : h = pointer to list 'dummy' header * 2 : s = string to add to the list * * Returns : N/A * *********************************************************************/ void enlist(struct list *h, const char *s) { struct list *n = (struct list *)malloc(sizeof(*n)); struct list *l; if (n) { n->str = strdup(s); n->next = NULL; if ((l = h->last)) { l->next = n; } else { h->next = n; } h->last = n; } } /********************************************************************* * * Function : destroy_list * * Description : Destroy a string list (opposite of enlist) * * Parameters : * 1 : h = pointer to list 'dummy' header * * Returns : N/A * *********************************************************************/ void destroy_list(struct list *h) { struct list *p, *n; for (p = h->next; p ; p = n) { n = p->next; freez(p->str); freez(p); } memset(h, '\0', sizeof(*h)); } /********************************************************************* * * Function : list_to_text * * Description : "Flaten" a string list into 1 long \r\n delimited string. * * Parameters : * 1 : h = pointer to list 'dummy' header * * Returns : NULL on malloc error, else new long string. * *********************************************************************/ static char *list_to_text(struct list *h) { struct list *p; char *ret = NULL; char *s; int size; size = 0; for (p = h->next; p ; p = p->next) { if (p->str) { size += strlen(p->str) + 2; } } if ((ret = (char *)malloc(size + 1)) == NULL) { return(NULL); } ret[size] = '\0'; s = ret; for (p = h->next; p ; p = p->next) { if (p->str) { strcpy(s, p->str); s += strlen(s); *s++ = '\r'; *s++ = '\n'; } } return(ret); } /********************************************************************* * * Function : sed * * Description : add, delete or modify lines in the HTTP header streams. * On entry, it receives a linked list of headers space * that was allocated dynamically (both the list nodes * and the header contents). * * As a side effect it frees the space used by the original * header lines. * * Parameters : * 1 : pats = list of patterns to match against headers * 2 : more_headers = list of functions to add more * headers (client or server) * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : Single pointer to a fully formed header. * *********************************************************************/ char *sed(const struct parsers pats[], void (* const more_headers[])(struct client_state *), struct client_state *csp) { struct list *p; const struct parsers *v; char *hdr; void (* const *f)(); for (v = pats; v->str ; v++) { for (p = csp->headers->next; p ; p = p->next) { /* Header crunch()ed in previous run? -> ignore */ if (p->str == NULL) continue; if (v == pats) log_error(LOG_LEVEL_HEADER, "scan: %s", p->str); if (strncmpic(p->str, v->str, v->len) == 0) { hdr = v->parser(v, p->str, csp); freez(p->str); p->str = hdr; } } } /* place any additional headers on the csp->headers list */ for (f = more_headers; *f ; f++) { (*f)(csp); } /* add the blank line at the end of the header, if necessary */ if ( (csp->headers->last == NULL) || (csp->headers->last->str == NULL) || (*csp->headers->last->str != '\0') ) { enlist(csp->headers, ""); } hdr = list_to_text(csp->headers); return(hdr); } /********************************************************************* * * Function : free_http_request * * Description : Freez a http_request structure * * Parameters : * 1 : http = points to a http_request structure to free * * Returns : N/A * *********************************************************************/ void free_http_request(struct http_request *http) { freez(http->cmd); freez(http->gpc); freez(http->host); freez(http->hostport); freez(http->path); freez(http->ver); } /********************************************************************* * * Function : parse_http_request * * Description : Parse out the host and port from the URL. Find the * hostname & path, port (if ':'), and/or password (if '@') * * Parameters : * 1 : req = URL (or is it URI?) to break down * 2 : http = pointer to the http structure to hold elements * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : N/A * *********************************************************************/ void parse_http_request(char *req, struct http_request *http, struct client_state *csp) { char *buf, *v[10], *url, *p; int n; memset(http, '\0', sizeof(*http)); http->cmd = strdup(req); buf = strdup(req); n = ssplit(buf, " \r\n", v, SZ(v), 1, 1); if (n == 3) { /* this could be a CONNECT request */ if (strcmpic(v[0], "connect") == 0) { http->ssl = 1; http->gpc = strdup(v[0]); http->hostport = strdup(v[1]); http->ver = strdup(v[2]); } #ifdef WEBDAV /* This next line is a little ugly, but it simplifies the if statement below. */ /* Basically if using webDAV, we want the OR condition to use these too. */ /* * by haroon * These are the headers as defined in RFC2518 to add webDAV support */ #define OR_WEBDAV || \ (0 == strcmpic(v[0], "propfind")) || \ (0 == strcmpic(v[0], "proppatch")) || \ (0 == strcmpic(v[0], "move")) || \ (0 == strcmpic(v[0], "copy")) || \ (0 == strcmpic(v[0], "mkcol")) || \ (0 == strcmpic(v[0], "lock")) || \ (0 == strcmpic(v[0], "unlock")) #else /* No webDAV support is enabled. Provide an empty OR_WEBDAV macro. */ #define OR_WEBDAV #endif /* or it could be a GET or a POST (possibly webDAV too) */ if ((strcmpic(v[0], "get") == 0) || (strcmpic(v[0], "head") == 0) OR_WEBDAV || (strcmpic(v[0], "post") == 0)) { http->ssl = 0; http->gpc = strdup(v[0]); url = v[1]; http->ver = strdup(v[2]); if (strncmpic(url, "http://", 7) == 0) { url += 7; } else if (strncmpic(url, "https://", 8) == 0) { url += 8; } else { url = NULL; } if (url && (p = strchr(url, '/'))) { http->path = strdup(p); *p = '\0'; http->hostport = strdup(url); } } } freez(buf); if (http->hostport == NULL) { free_http_request(http); return; } buf = strdup(http->hostport); /* check if url contains password */ n = ssplit(buf, "@", v, SZ(v), 1, 1); if (n == 2) { char * newbuf = NULL; newbuf = strdup(v[1]); freez(buf); buf = newbuf; } n = ssplit(buf, ":", v, SZ(v), 1, 1); if (n == 1) { http->host = strdup(v[0]); http->port = 80; } if (n == 2) { http->host = strdup(v[0]); http->port = atoi(v[1]); } freez(buf); if (http->host == NULL) { free_http_request(http); } if (http->path == NULL) { http->path = strdup(""); } } /* here begins the family of parser functions that reformat header lines */ /********************************************************************* * * Function : crumble * * Description : This is called if a header matches a pattern to "crunch" * * Parameters : * 1 : v = Pointer to parsers structure, which basically holds * headers (client or server) that we want to "crunch" * 2 : s = header (from sed) to "crunch" * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : Always NULL. * *********************************************************************/ char *crumble(const struct parsers *v, char *s, struct client_state *csp) { log_error(LOG_LEVEL_HEADER, "crunch!"); return(NULL); } #if defined(PCRS) || defined(KILLPOPUPS) /********************************************************************* * * Function : content_type * * Description : Is this a text/.* or javascript MIME Type? * * Parameters : * 1 : v = ignored * 2 : s = header string we are "considering" * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : A duplicate string pointer to this header (ie. pass thru) * *********************************************************************/ char *content_type(const struct parsers *v, char *s, struct client_state *csp) { if (strstr (s, " text/") || strstr (s, "application/x-javascript")) csp->is_text = 1; else csp->is_text = 0; return(strdup(s)); } #endif /* defined(PCRS) || defined(KILLPOPUPS) */ #ifdef PCRS /********************************************************************* * * Function : content_length * * Description : Crunch Content-Length header if & only if we are * filtering this page through PCRS. * * Parameters : * 1 : v = ignored * 2 : s = header string we are "considering" * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : A duplicate string pointer to this header (ie. pass thru) * *********************************************************************/ char *content_length(const struct parsers *v, char *s, struct client_state *csp) { if (csp->content_length != 0) /* Content has been modified */ { s = (char *) zalloc(100); sprintf(s, "Content-Length: %d", csp->content_length); log_error(LOG_LEVEL_HEADER, "Adjust Content-Length to %d", csp->content_length); return(s); } else { return(strdup(s)); } } #endif /* def PCRS */ /********************************************************************* * * Function : client_referrer * * Description : Handle the "referer" config setting properly. * Called from `sed'. * * Parameters : * 1 : v = ignored * 2 : s = header (from sed) to "crunch" * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : NULL if crunched, or a malloc'ed string with the original * or modified header * *********************************************************************/ char *client_referrer(const struct parsers *v, char *s, struct client_state *csp) { #ifdef FORCE_LOAD /* Since the referrer can include the prefix even * even if the request itself is non-forced, we must * clean it unconditionally */ strclean(s, FORCE_PREFIX); #endif /* def FORCE_LOAD */ #ifdef TRUST_FILES csp->referrer = strdup(s); #endif /* def TRUST_FILES */ /* * Check permissionsfile. If we have allowed this site to get the * referer, then send it and we're done. */ if (csp->permissions & PERMIT_REFERER) { return(strdup(s)); } /* * Check configfile. Are we blocking referer? */ if ( (csp->config->referrer == NULL) || (*csp->config->referrer == '@') ) { log_error(LOG_LEVEL_HEADER, "crunch!"); return(NULL); } /* * Check configfile. Are we always sending referer? */ if (*csp->config->referrer == '.') { return(strdup(s)); } /* * New option § or L: Forge a referer as http://[hostname:port of REQUEST]/ * to fool stupid checks for in-site links */ if (*csp->config->referrer == '§' || *csp->config->referrer == 'L') { log_error(LOG_LEVEL_HEADER, "crunch+forge!"); s = strsav(NULL, "Referer: "); s = strsav(s, "http://"); s = strsav(s, csp->http->hostport); s = strsav(s, "/"); return(s); } /* * We have a specific (fixed) referer we want to send. */ log_error(LOG_LEVEL_HEADER, "modified"); s = strsav( NULL, "Referer: " ); s = strsav( s, csp->config->referrer ); return(s); } /********************************************************************* * * Function : client_uagent * * Description : Handle the "user-agent" config setting properly. * Called from `sed'. * * Parameters : * 1 : v = ignored * 2 : s = header (from sed) to "crunch" * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : A malloc'ed pointer to the default agent, or * a malloc'ed string pointer to this header (ie. pass thru). * *********************************************************************/ char *client_uagent(const struct parsers *v, char *s, struct client_state *csp) { #ifdef DETECT_MSIE_IMAGES if (strstr (s, "MSIE ")) { /* This is Microsoft Internet Explorer. * Enable auto-detect. */ csp->accept_types |= ACCEPT_TYPE_IS_MSIE; } #endif /* def DETECT_MSIE_IMAGES */ if (csp->config->uagent == NULL) { log_error(LOG_LEVEL_HEADER, "default"); return(strdup(DEFAULT_USER_AGENT)); } if (*csp->config->uagent == '.') { return(strdup(s)); } if (*csp->config->uagent == '@') { if (csp->permissions & PERMIT_USER_AGENT) { return(strdup(s)); } else { log_error(LOG_LEVEL_HEADER, "default"); return(strdup(DEFAULT_USER_AGENT)); } } log_error(LOG_LEVEL_HEADER, "modified"); s = strsav( NULL, "User-Agent: " ); s = strsav( s, csp->config->uagent ); return(s); } /********************************************************************* * * Function : client_ua * * Description : Handle "ua-" headers properly. Called from `sed'. * * Parameters : * 1 : v = ignored * 2 : s = header (from sed) to "crunch" * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : NULL if crunched, or a malloc'ed string to original header * *********************************************************************/ char *client_ua(const struct parsers *v, char *s, struct client_state *csp) { if (csp->config->uagent == NULL) { log_error(LOG_LEVEL_HEADER, "crunch!"); return(NULL); } if (*csp->config->uagent == '.') { return(strdup(s)); } if (*csp->config->uagent == '@') { if (csp->permissions & PERMIT_USER_AGENT) { return(strdup(s)); } else { log_error(LOG_LEVEL_HEADER, "crunch!"); return(NULL); } } log_error(LOG_LEVEL_HEADER, "crunch!"); return(NULL); } /********************************************************************* * * Function : client_from * * Description : Handle the "from" config setting properly. * Called from `sed'. * * Parameters : * 1 : v = ignored * 2 : s = header (from sed) to "crunch" * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : NULL if crunched, or a malloc'ed string to * modified/original header. * *********************************************************************/ char *client_from(const struct parsers *v, char *s, struct client_state *csp) { /* if not set, zap it */ if (csp->config->from == NULL) { log_error(LOG_LEVEL_HEADER, "crunch!"); return(NULL); } if (*csp->config->from == '.') { return(strdup(s)); } log_error(LOG_LEVEL_HEADER, " modified"); s = strsav( NULL, "From: " ); s = strsav( s, csp->config->from ); return(s); } /********************************************************************* * * Function : client_send_cookie * * Description : Handle the "cookie" header properly. Called from `sed'. * If cookie is accepted, add it to the cookie_list, * else we crunch it. Mmmmmmmmmmm ... cookie ...... * * Parameters : * 1 : v = pattern of cookie `sed' found matching * 2 : s = header (from sed) to "crunch" * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : Always NULL. * *********************************************************************/ char *client_send_cookie(const struct parsers *v, char *s, struct client_state *csp) { if (csp->permissions & PERMIT_COOKIE_READ) { enlist(csp->cookie_list, s + v->len + 1); } else { log_error(LOG_LEVEL_HEADER, " crunch!"); } /* * Always return NULL here. The cookie header * will be sent at the end of the header. */ return(NULL); } /********************************************************************* * * Function : client_x_forwarded * * Description : Handle the "x-forwarded-for" config setting properly, * also used in the add_client_headers list. Called from `sed'. * * Parameters : * 1 : v = ignored * 2 : s = header (from sed) to "crunch" * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : Always NULL. * *********************************************************************/ char *client_x_forwarded(const struct parsers *v, char *s, struct client_state *csp) { if (csp->config->add_forwarded) { csp->x_forwarded = strdup(s); } /* * Always return NULL, since this information * will be sent at the end of the header. */ return(NULL); } #if defined(DETECT_MSIE_IMAGES) /********************************************************************* * * Function : client_accept * * Description : Detect whether the client wants HTML or an image. * Clients do not always make this information available * in a sane way. Always passes the header through * the proxy unchanged. * * Parameters : * 1 : v = Ignored. * 2 : s = Header string. Null terminated. * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : Duplicate of argument s. * *********************************************************************/ char *client_accept(const struct parsers *v, char *s, struct client_state *csp) { #ifdef DETECT_MSIE_IMAGES if (strstr (s, "image/gif")) { /* Client will accept HTML. If this seems counterintuitive, * blame Microsoft. */ csp->accept_types |= ACCEPT_TYPE_MSIE_HTML; } else { csp->accept_types |= ACCEPT_TYPE_MSIE_IMAGE; } #endif /* def DETECT_MSIE_IMAGES */ return(strdup(s)); } #endif /* defined(DETECT_MSIE_IMAGES) */ /* the following functions add headers directly to the header list */ /********************************************************************* * * Function : client_cookie_adder * * Description : Used in the add_client_headers list. Called from `sed'. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * * Returns : N/A * *********************************************************************/ void client_cookie_adder(struct client_state *csp) { struct list *l; char *tmp = NULL; char *e; for (l = csp->cookie_list->next; l ; l = l->next) { if (tmp) { tmp = strsav(tmp, "; "); } tmp = strsav(tmp, l->str); } for (l = csp->config->wafer_list->next; l ; l = l->next) { if (tmp) { tmp = strsav(tmp, "; "); } if ((e = cookie_encode(l->str))) { tmp = strsav(tmp, e); freez(e); } } if (tmp) { char *ret; ret = strdup("Cookie: "); ret = strsav(ret, tmp); log_error(LOG_LEVEL_HEADER, "addh: %s", ret); enlist(csp->headers, ret); freez(tmp); freez(ret); } } /********************************************************************* * * Function : client_xtra_adder * * Description : Used in the add_client_headers list. Called from `sed'. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * * Returns : N/A * *********************************************************************/ void client_xtra_adder(struct client_state *csp) { struct list *l; for (l = csp->config->xtra_list->next; l ; l = l->next) { log_error(LOG_LEVEL_HEADER, "addh: %s", l->str); enlist(csp->headers, l->str); } } /********************************************************************* * * Function : client_x_forwarded_adder * * Description : Used in the add_client_headers list. Called from `sed'. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * * Returns : N/A * *********************************************************************/ void client_x_forwarded_adder(struct client_state *csp) { char *p = NULL; if (csp->config->add_forwarded == 0) { return; } if (csp->x_forwarded) { p = strsav(p, csp->x_forwarded); p = strsav(p, ", "); p = strsav(p, csp->ip_addr_str); } else { p = strsav(p, "X-Forwarded-For: "); p = strsav(p, csp->ip_addr_str); } log_error(LOG_LEVEL_HEADER, "addh: %s", p); enlist(csp->headers, p); } /********************************************************************* * * Function : server_set_cookie * * Description : Handle the server "cookie" header properly. * Log cookie to the jar file. Then "crunch" it, * or accept it. Called from `sed'. * * Parameters : * 1 : v = parser pattern that matched this header * 2 : s = header that matched this pattern * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : `crumble' or a newly malloc'ed string. * *********************************************************************/ char *server_set_cookie(const struct parsers *v, char *s, struct client_state *csp) { #ifdef JAR_FILES if (csp->config->jar) { fprintf(csp->config->jar, "%s\t%s\n", csp->http->host, (s + v->len + 1)); } #endif /* def JAR_FILES */ if (!(csp->permissions & PERMIT_COOKIE_SET)) { return(crumble(v, s, csp)); } return(strdup(s)); } #ifdef FORCE_LOAD /********************************************************************* * * Function : client_host * * Description : Clean the FORCE_PREFIX out of the 'host' http * header, if we use force * * Parameters : * 1 : v = ignored * 2 : s = header (from sed) to clean * 3 : csp = Current client state (buffers, headers, etc...) * * Returns : A malloc'ed pointer to the cleaned host header * *********************************************************************/ char *client_host(const struct parsers *v, char *s, struct client_state *csp) { char *cleanhost = strdup(s); if(csp->force) strclean(cleanhost, FORCE_PREFIX); return(cleanhost); } #endif /* def FORCE_LOAD */ #ifdef FORCE_LOAD /********************************************************************* * * Function : strclean * * Description : In-Situ-Eliminate all occurances of substring in * string * * Parameters : * 1 : string = string to clean * 2 : substring = substring to eliminate * * Returns : Number of eliminations * *********************************************************************/ int strclean(const char *string, const char *substring) { int hits = 0, len = strlen(substring); char *pos, *p; while((pos = strstr(string, substring))) { p = pos + len; do { *(p - len) = *p; } while (*p++ != '\0'); hits++; } return(hits); } #endif /* def FORCE_LOAD */ /* Local Variables: tab-width: 3 end: */