src/HttpMsg.cc

   1
   2 /*
   3  * $Id: HttpMsg.cc,v 1.10 2001/01/12 00:37:14 wessels Exp $
   4  *
   5  * DEBUG: section 74    HTTP Message
   6  * AUTHOR: Alex Rousskov
   7  *
   8  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   9  * ----------------------------------------------------------
  10  *
  11  *  Squid is the result of efforts by numerous individuals from
  12  *  the Internet community; see the CONTRIBUTORS file for full
  13  *  details.   Many organizations have provided support for Squid's
  14  *  development; see the SPONSORS file for full details.  Squid is
  15  *  Copyrighted (C) 2001 by the Regents of the University of
  16  *  California; see the COPYRIGHT file for full details.  Squid
  17  *  incorporates software developed and/or copyrighted by other
  18  *  sources; see the CREDITS file for full details.
  19  *
  20  *  This program is free software; you can redistribute it and/or modify
  21  *  it under the terms of the GNU General Public License as published by
  22  *  the Free Software Foundation; either version 2 of the License, or
  23  *  (at your option) any later version.
  24  *
  25  *  This program is distributed in the hope that it will be useful,
  26  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  *  GNU General Public License for more details.
  29  *
  30  *  You should have received a copy of the GNU General Public License
  31  *  along with this program; if not, write to the Free Software
  32  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  33  *
  34  */
  35
  36 #include "squid.h"
  37
  38
  39 /* find end of headers */
  40 int
  41 httpMsgIsolateHeaders(const char **parse_start, const char **blk_start, const char **blk_end)
  42 {
  43     /*
  44      * parse_start points to the first line of HTTP message *headers*,
  45      * not including the request or status lines
  46      */
  47     size_t l = strlen(*parse_start);
  48     size_t end = headersEnd(*parse_start, l);
  49     int nnl;
  50     if (end) {
  51         *blk_start = *parse_start;
  52         *blk_end = *parse_start + end - 1;
  53         /*
  54          * leave blk_end pointing to the first character after the
  55          * first newline which terminates the headers
  56          */
  57         assert(**blk_end == '\n');
  58         while (*(*blk_end - 1) == '\r')
  59             (*blk_end)--;
  60         assert(*(*blk_end - 1) == '\n');
  61         *parse_start += end;
  62         return 1;
  63     }
  64     /*
  65      * If we didn't find the end of headers, and parse_start does
  66      * NOT point to a CR or NL character, then return failure
  67      */
  68     if (**parse_start != '\r' && **parse_start != '\n')
  69         return 0;               /* failure */
  70     /*
  71      * If we didn't find the end of headers, and parse_start does point
  72      * to an empty line, then we have empty headers.  Skip all CR and
  73      * NL characters up to the first NL.  Leave parse_start pointing at
  74      * the first character after the first NL.
  75      */
  76     *blk_start = *parse_start;
  77     *blk_end = *blk_start;
  78     for (nnl = 0; nnl == 0; (*parse_start)++) {
  79         if (**parse_start == '\r')
  80             (void) 0;
  81         else if (**parse_start == '\n')
  82             nnl++;
  83         else
  84             break;
  85     }
  86     return 1;
  87 }
  88
  89 /* returns true if connection should be "persistent"
  90  * after processing this message */
  91 int
  92 httpMsgIsPersistent(http_version_t http_ver, const HttpHeader * hdr)
  93 {
  94     if ((http_ver.major >= 1) && (http_ver.minor >= 1)) {
  95         /*
  96          * for modern versions of HTTP: persistent unless there is
  97          * a "Connection: close" header.
  98          */
  99         return !httpHeaderHasConnDir(hdr, "close");
 100     } else {
 101         /*
 102          * Persistent connections in Netscape 3.x are allegedly broken,
 103          * return false if it is a browser connection.  If there is a
 104          * VIA header, then we assume this is NOT a browser connection.
 105          */
 106         const char *agent = httpHeaderGetStr(hdr, HDR_USER_AGENT);
 107         if (agent && !httpHeaderHas(hdr, HDR_VIA)) {
 108             if (!strncasecmp(agent, "Mozilla/3.", 10))
 109                 return 0;
 110             if (!strncasecmp(agent, "Netscape/3.", 11))
 111                 return 0;
 112         }
 113         /* for old versions of HTTP: persistent if has "keep-alive" */
 114         return httpHeaderHasConnDir(hdr, "keep-alive");
 115     }
 116 }