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adcroft |
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/* |
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$Id: httpserver.c,v 1.10 2002/08/14 22:08:48 whmoseley Exp $ |
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** |
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** Copyright (C) 1995, 1996, 1997, 1998 Hewlett-Packard Company |
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** Originally by Kevin Hughes, kev@kevcom.com, 3/11/94 |
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** |
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** This program and library is free software; you can redistribute it and/or |
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** modify it under the terms of the GNU (Library) General Public License |
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** as published by the Free Software Foundation; either version 2 |
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** of the License, or any later version. |
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** |
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** This program is distributed in the hope that it will be useful, |
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** but WITHOUT ANY WARRANTY; without even the implied warranty of |
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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** GNU (Library) General Public License for more details. |
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** |
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** You should have received a copy of the GNU (Library) General Public License |
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** long with this program; if not, write to the Free Software |
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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**-------------------------------------------------------------------- |
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** All the code in this file added by Ron Klachko ron@ckm.ucsf.edu 9/98 |
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** |
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** change sprintf to snprintf to avoid corruption |
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** SRE 11/17/99 |
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** |
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** fixed cast to int problems pointed out by "gcc -Wall" |
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** SRE 2/22/00 |
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** |
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*/ |
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/* |
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** httpserver.c |
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*/ |
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#ifndef _WIN32 |
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#include <unistd.h> |
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#endif |
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#include <time.h> |
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#include <stdarg.h> |
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#include "swish.h" |
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#include "mem.h" |
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#include "string.h" |
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#include "index.h" |
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#include "http.h" |
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#include "httpserver.h" |
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#include "file.h" |
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/* The list of servers that we are acting on. |
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**/ |
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static httpserverinfo *servers = 0; |
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static void parserobotstxt(char *robots_buffer, int buflen, httpserverinfo *server); |
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static char *isolatevalue(char *line, char *keyword, int *plen); |
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static int serverinlist(char *url, struct swline *list); |
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/* Find the robot rules for this URL. If haven't retrieved them |
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** yet, do so now. |
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**/ |
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httpserverinfo *getserverinfo(SWISH *sw, char *url) |
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{ |
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httpserverinfo *server; |
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char *method; |
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int methodlen; |
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char *serverport; |
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int serverportlen; |
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static int lencontenttype=0; |
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static char *contenttype=NULL; |
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static int lenbuffer=0; |
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static char *buffer=NULL; |
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FILE *fp; |
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struct MOD_Index *idx = sw->Index; |
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time_t last_modified; |
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// argh, this is ugly |
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char *file_prefix; // prefix for use with files written by swishspider -- should just be on the stack! |
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if(!lenbuffer)buffer=emalloc((lenbuffer=MAXSTRLEN)+1); |
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if(!lencontenttype)contenttype=emalloc((lencontenttype=MAXSTRLEN)+1); |
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if ((method = url_method(url, &methodlen)) == 0) { |
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return 0; |
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} |
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if ((serverport = url_serverport(url, &serverportlen)) == 0) { |
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return 0; |
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} |
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/* Search for the rules |
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**/ |
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for (server = servers; server; server = server->next) { |
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if (equivalentserver(sw, url, server->baseurl)) { |
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return server; |
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} |
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} |
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/* Create a new entry for this server and add it to the list. |
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**/ |
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server = (httpserverinfo *)emalloc(sizeof(httpserverinfo)); |
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/* +3 for the ://, +1 for the trailing /, +1 for the terminating null |
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**/ |
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server->baseurl = (char *)emalloc(methodlen + serverportlen + 5); |
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/* These 4 lines to avoid a call to non ANSI snprintf . May not be the |
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best way but it ensures no buffer overruns */ |
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memcpy (server->baseurl,method,methodlen); |
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memcpy (server->baseurl+methodlen,"://",3); |
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memcpy (server->baseurl+methodlen+3,serverport,serverportlen); |
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strcpy (server->baseurl+methodlen+3+serverportlen,"/"); |
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server->lastretrieval = 0; |
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server->robotrules = 0; |
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server->next = servers; |
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servers = server; |
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/* Only http(s) servers can full rules, all the other ones just get dummies |
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** (this is useful for holding last retrieval) |
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** |
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** http://info.webcrawler.com/mak/projects/robots/norobots.html holds what |
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** many people consider the official web exclusion rules. Unfortunately, |
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** the rules are not consistent about how records are formed. One line |
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** states "the file consists of one or more records separated by one or more |
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** blank lines" while another states "the record starts with one or more User-agent |
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** lines, followed by one or more Disallow lines." |
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** |
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** So, does a blank line after a User-agent line end a record? The spec is |
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** unclear on this matter. If the next legal line afer the blank line is |
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** a Disallow line, the blank line should most likely be ignored. But what |
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** if the next line is another User-agent line? For example: |
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** |
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** User-agent: MooBot |
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** |
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** User-agent: CreepySpider |
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** Disallow: /cgi-bin |
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** |
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** One interpretation (based on blank lines termination records) is that MooBot |
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** may visit any location (since there are no Disallows for it). Another |
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** interpretation (based on records needing both User-agent and Disallow lines) |
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** is that MooBot may not visit /cgi-bin |
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** |
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** While poking around, I found at least one site (www.sun.com) that uses blank |
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** lines within records. Because of that, I have decided to rely on records |
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** having both User-agent and Disallow lines (the second interpretation above). |
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**/ |
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if (strncmp(server->baseurl, "http", 4) == 0) { |
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if((int)(strlen(server->baseurl)+20)>=lenbuffer) { |
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lenbuffer=strlen(server->baseurl)+20+200; |
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buffer=erealloc(buffer,lenbuffer+1); |
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} |
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sprintf(buffer, "%srobots.txt", server->baseurl); |
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file_prefix = emalloc( strlen(idx->tmpdir) + MAXPIDLEN + strlen("/swishspider@.contents+fill") ); |
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sprintf(file_prefix, "%s/swishspider@%ld", idx->tmpdir, (long) lgetpid()); |
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if (get(sw,contenttype, &last_modified, &server->lastretrieval, file_prefix, buffer) == 200) |
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{ |
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char *robots_buffer; |
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int filelen; |
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int bytes_read; |
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if((int)(strlen(idx->tmpdir)+MAXPIDLEN+30)>=lenbuffer) { |
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lenbuffer=strlen(idx->tmpdir)+MAXPIDLEN+30+200; |
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buffer=erealloc(buffer,lenbuffer+1); |
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} |
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sprintf(buffer, "%s/swishspider@%ld.contents", idx->tmpdir, (long)lgetpid()); |
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fp = fopen(buffer, F_READ_TEXT); |
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filelen = getsize(buffer); |
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robots_buffer = emalloc( filelen + 1 ); |
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*robots_buffer = '\0'; |
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bytes_read = fread(robots_buffer, 1, filelen, fp); |
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robots_buffer[bytes_read] = '\0'; |
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parserobotstxt( robots_buffer, bytes_read, server ); |
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efree( robots_buffer ); |
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//parserobotstxt(fp, server); |
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//fclose(fp); |
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} |
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efree( file_prefix ); |
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cmdf(unlink, "%s/swishspider@%ld.response", idx->tmpdir, lgetpid()); |
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cmdf(unlink, "%s/swishspider@%ld.contents", idx->tmpdir, lgetpid()); |
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cmdf(unlink, "%s/swishspider@%ld.links", idx->tmpdir, lgetpid()); |
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} |
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return server; |
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} |
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int urldisallowed(SWISH *sw, char *url) |
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{ |
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httpserverinfo *server; |
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robotrules *rule; |
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char *uri; |
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int urilen; |
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if ((server = getserverinfo(sw, url)) == 0) { |
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return 1; |
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} |
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if ((uri = url_uri(url, &urilen)) == 0) { |
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return 1; |
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} |
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for (rule = server->robotrules; rule; rule = rule->next) { |
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if (strncmp(uri, rule->disallow, strlen(rule->disallow)) == 0) { |
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return 1; |
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} |
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} |
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return 0; |
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} |
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// quick fix to parse from Mac and Windows. |
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// Pass in: |
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// char **next_start == pointer to a *char that has where the next string starts. |
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// char *last_char == pointer to last char in buffer. Buffer MUST have room for one more char |
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// |
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// returns NULL on no more strings |
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static char *next_line( char **next_start, char *last_char ) |
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{ |
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char *buffer = *next_start; |
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char *start; |
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// skip over any leading new lines or cr. |
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while ( buffer <= last_char && ( *buffer == '\0' || *buffer == '\n' || *buffer == '\r' ) ) |
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buffer++; |
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if ( buffer > last_char ) |
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return NULL; |
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start = buffer; // start of this word |
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// Now find the end of this string |
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while ( buffer <= last_char && ( *buffer != '\0' && *buffer != '\n' && *buffer != '\r' ) ) |
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buffer++; |
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*buffer = '\0'; // mark the end of the string |
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buffer++; |
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*next_start = buffer; |
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return start; |
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} |
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static char useragent[] = "user-agent:"; |
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static char disallow[] = "disallow:"; |
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static char swishspider[] = "swishspider"; |
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static void parserobotstxt(char *robots_buffer, int buflen, httpserverinfo *server) |
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{ |
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char *buffer; |
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char *bufend = robots_buffer + buflen -1; // last char of string |
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char *next_start = robots_buffer; |
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enum {START, USERAGENT, DISALLOW} state = START; |
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enum {SPECIFIC, GENERIC, SKIPPING} useragentstate = SKIPPING; |
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char *p; |
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int len; |
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robotrules *entry; |
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robotrules *entry2; |
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server->useragent = 0; |
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buffer = NULL; |
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while ( (buffer = next_line( &next_start, bufend ) ) ) |
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{ |
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if ( strchr( buffer, '#' ) ) |
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*(strchr( buffer, '#' )) = '\0'; |
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if ((*buffer == '#') || (*buffer == '\0')) |
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continue; |
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if (strncasecmp(buffer, useragent, sizeof(useragent) - 1) == 0) { |
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switch (state) { |
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case DISALLOW: |
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/* Since we found our specific user-agent, we can |
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** skip the rest of the file. |
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**/ |
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if (useragentstate == SPECIFIC) { |
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return; |
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} |
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useragentstate = SKIPPING; |
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/* explict fallthrough */ |
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case START: |
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case USERAGENT: |
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state = USERAGENT; |
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if (useragentstate != SPECIFIC) { |
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p = isolatevalue(buffer, useragent, &len); |
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if ((len == (sizeof(swishspider) - 1)) && |
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(strncasecmp(p, swishspider, sizeof(swishspider) - 1) == 0) ) { |
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useragentstate = SPECIFIC; |
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/* We might have already parsed generic rules, |
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** so clean them up if necessary. |
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*/ |
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if (server->useragent) { |
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efree(server->useragent); |
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} |
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for (entry = server->robotrules; entry; ) { |
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entry2 = entry->next; |
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efree(entry); |
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entry = entry2; |
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} |
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server->robotrules = 0; |
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server->useragent = (char *)emalloc(len + 1); |
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strncpy(server->useragent, p, len); |
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*(server->useragent + len) = '\0'; |
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} |
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else if ((len == 1) && (*p == '*')) { |
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useragentstate = GENERIC; |
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server->useragent = (char *)emalloc(2); |
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strcpy(server->useragent, "*"); /* emalloc'd 2 bytes, no safestrcpy */ |
| 335 |
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} |
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} |
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| 340 |
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break; |
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| 342 |
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} |
| 343 |
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} |
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| 345 |
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if (strncasecmp(buffer, disallow, sizeof(disallow) - 1) == 0) { |
| 346 |
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state = DISALLOW; |
| 347 |
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if (useragentstate != SKIPPING) { |
| 348 |
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p = isolatevalue(buffer, disallow, &len); |
| 349 |
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if (len) { |
| 350 |
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entry = (robotrules *)emalloc(sizeof(robotrules)); |
| 351 |
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entry->next = server->robotrules; |
| 352 |
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server->robotrules = entry; |
| 353 |
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entry->disallow = (char *)emalloc(len + 1); |
| 354 |
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strncpy(entry->disallow, p, len); |
| 355 |
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*(entry->disallow + len) = '\0'; |
| 356 |
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} |
| 357 |
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} |
| 358 |
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} |
| 359 |
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} |
| 360 |
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} |
| 361 |
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| 362 |
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| 363 |
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static char *isolatevalue(char *line, char *keyword, int *plen) |
| 364 |
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{ |
| 365 |
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/* Find the beginning of the value |
| 366 |
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**/ |
| 367 |
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for (line += strlen(keyword); isspace((int)((unsigned char)*line)); line++ ) { /* cast to int 2/22/00 */ |
| 368 |
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} |
| 369 |
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| 370 |
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/* Strip off trailing spaces |
| 371 |
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**/ |
| 372 |
|
|
for (*plen = strlen(line); isspace((int)((unsigned char)*(line + *plen - 1))); (*plen)--) { /* cast to int 2/22/00 */ |
| 373 |
|
|
} |
| 374 |
|
|
|
| 375 |
|
|
return line; |
| 376 |
|
|
} |
| 377 |
|
|
|
| 378 |
|
|
|
| 379 |
|
|
int equivalentserver(SWISH *sw, char *url, char *baseurl) |
| 380 |
|
|
{ |
| 381 |
|
|
char *method; |
| 382 |
|
|
int methodlen; |
| 383 |
|
|
char *serverport; |
| 384 |
|
|
int serverportlen; |
| 385 |
|
|
char *basemethod; |
| 386 |
|
|
int basemethodlen; |
| 387 |
|
|
char *baseserverport; |
| 388 |
|
|
int baseserverportlen; |
| 389 |
|
|
struct multiswline *walk=NULL; |
| 390 |
|
|
struct MOD_HTTP *http = sw->HTTP; |
| 391 |
|
|
|
| 392 |
|
|
method = url_method(url, &methodlen); |
| 393 |
|
|
serverport = url_serverport(url, &serverportlen); |
| 394 |
|
|
basemethod = url_method(baseurl, &basemethodlen); |
| 395 |
|
|
baseserverport = url_serverport(baseurl, &baseserverportlen); |
| 396 |
|
|
|
| 397 |
|
|
if (!method || !serverport || !basemethod || !baseserverport) { |
| 398 |
|
|
return 0; |
| 399 |
|
|
} |
| 400 |
|
|
|
| 401 |
|
|
/* If this is the same server, we just go for it |
| 402 |
|
|
**/ |
| 403 |
|
|
if ((methodlen == basemethodlen) && (serverportlen == baseserverportlen) && |
| 404 |
|
|
(strncasecmp(method, basemethod, methodlen) == 0) && |
| 405 |
|
|
(strncasecmp(serverport, baseserverport, serverportlen) == 0)) { |
| 406 |
|
|
return 1; |
| 407 |
|
|
} |
| 408 |
|
|
|
| 409 |
|
|
/* Do we find the method/server info for this and the base url |
| 410 |
|
|
** in the same equivalence list? |
| 411 |
|
|
**/ |
| 412 |
|
|
for (walk = http->equivalentservers; walk; walk = walk->next ) { |
| 413 |
|
|
if (serverinlist(url, walk->list) && |
| 414 |
|
|
serverinlist(baseurl, walk->list)) { |
| 415 |
|
|
return 1; |
| 416 |
|
|
} |
| 417 |
|
|
} |
| 418 |
|
|
|
| 419 |
|
|
return 0; |
| 420 |
|
|
} |
| 421 |
|
|
|
| 422 |
|
|
|
| 423 |
|
|
static int serverinlist(char *url, struct swline *list) |
| 424 |
|
|
{ |
| 425 |
|
|
char *method; |
| 426 |
|
|
int methodlen; |
| 427 |
|
|
char *serverport; |
| 428 |
|
|
int serverportlen; |
| 429 |
|
|
char *listmethod; |
| 430 |
|
|
int listmethodlen; |
| 431 |
|
|
char *listserverport; |
| 432 |
|
|
int listserverportlen; |
| 433 |
|
|
|
| 434 |
|
|
method = url_method(url, &methodlen); |
| 435 |
|
|
serverport = url_serverport(url, &serverportlen); |
| 436 |
|
|
if (!method || !serverport) { |
| 437 |
|
|
return 0; |
| 438 |
|
|
} |
| 439 |
|
|
|
| 440 |
|
|
for ( ; list; list = list->next) { |
| 441 |
|
|
listmethod = url_method(list->line, &listmethodlen); |
| 442 |
|
|
listserverport = url_serverport(list->line, &listserverportlen); |
| 443 |
|
|
if (listmethod && listserverport) { |
| 444 |
|
|
if ((methodlen == listmethodlen) && (serverportlen == listserverportlen) && |
| 445 |
|
|
(strncasecmp(method, listmethod, methodlen) == 0) && |
| 446 |
|
|
(strncasecmp(serverport, listserverport, serverportlen) == 0)) { |
| 447 |
|
|
return 1; |
| 448 |
|
|
} |
| 449 |
|
|
} |
| 450 |
|
|
} |
| 451 |
|
|
return 0; |
| 452 |
|
|
} |
| 453 |
|
|
|
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