302 lines
6.8 KiB
C
302 lines
6.8 KiB
C
/* packet-http.c
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* Routines for HTTP packet disassembly
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*
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* Guy Harris <guy@alum.mit.edu>
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*
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* $Id: packet-http.c,v 1.17 2000/04/08 07:07:17 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU 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 (at your option) 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along 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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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include <string.h>
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#include <ctype.h>
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#include <glib.h>
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#include "packet.h"
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#include "packet-ipp.h"
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typedef enum _http_type {
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HTTP_REQUEST,
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HTTP_RESPONSE,
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HTTP_OTHERS
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} http_type_t;
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static int proto_http = -1;
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static int hf_http_response = -1;
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static int hf_http_request = -1;
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static gint ett_http = -1;
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#define TCP_PORT_HTTP 80
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#define TCP_PORT_PROXY_HTTP 3128
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#define TCP_PORT_PROXY_ADMIN_HTTP 3132
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#define TCP_ALT_PORT_HTTP 8080
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static int is_http_request_or_reply(const u_char *data, int linelen, http_type_t *type);
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void dissect_http(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
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{
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gboolean is_ipp = (pi.srcport == 631 || pi.destport == 631);
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proto_item *ti;
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proto_tree *http_tree;
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const u_char *data, *dataend;
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const u_char *linep, *lineend, *eol;
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int linelen;
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u_char c;
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http_type_t http_type = HTTP_OTHERS;
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data = &pd[offset];
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dataend = data + END_OF_FRAME;
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, is_ipp ? "IPP" : "HTTP");
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if (check_col(fd, COL_INFO)) {
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/*
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* Put the first line from the buffer into the summary,
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* if it's an HTTP request or reply.
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* Otherwise, just call it a continuation.
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*/
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lineend = find_line_end(data, dataend, &eol);
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linelen = lineend - data;
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if (is_http_request_or_reply(data, linelen, &http_type))
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col_add_str(fd, COL_INFO, format_text(data, linelen));
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else
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col_add_str(fd, COL_INFO, "Continuation");
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_http, offset, END_OF_FRAME, NULL);
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http_tree = proto_item_add_subtree(ti, ett_http);
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while (data < dataend) {
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/*
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* Find the end of the line.
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*/
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lineend = find_line_end(data, dataend, &eol);
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linelen = lineend - data;
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/*
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* OK, does it look like an HTTP request or
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* response?
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*/
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if (is_http_request_or_reply(data, linelen, &http_type))
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goto is_http;
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/*
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* No. Does it look like a blank line (as would
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* appear at the end of an HTTP request)?
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*/
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if (linelen == 1) {
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if (*data == '\n')
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goto is_http;
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}
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if (linelen == 2) {
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if (strncmp(data, "\r\n", 2) == 0 ||
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strncmp(data, "\n\r", 2) == 0)
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goto is_http;
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}
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/*
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* No. Does it look like a MIME header?
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*/
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linep = data;
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while (linep < lineend) {
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c = *linep++;
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if (!isprint(c))
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break; /* not printable, not a MIME header */
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switch (c) {
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case '(':
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case ')':
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case '<':
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case '>':
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case '@':
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case ',':
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case ';':
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case '\\':
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case '"':
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case '/':
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case '[':
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case ']':
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case '?':
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case '=':
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case '{':
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case '}':
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/*
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* It's a tspecial, so it's not
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* part of a token, so it's not
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* a field name for the beginning
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* of a MIME header.
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*/
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goto not_http;
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case ':':
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/*
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* This ends the token; we consider
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* this to be a MIME header.
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*/
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goto is_http;
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}
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}
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not_http:
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/*
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* We don't consider this part of an HTTP request or
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* reply, so we don't display it.
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* (Yeah, that means we don't display, say, a
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* text/http page, but you can get that from the
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* data pane.)
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*/
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break;
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is_http:
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/*
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* Put this line.
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*/
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proto_tree_add_text(http_tree, offset, linelen, "%s",
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format_text(data, linelen));
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offset += linelen;
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data = lineend;
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}
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switch (http_type) {
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case HTTP_RESPONSE:
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proto_tree_add_item_hidden(http_tree,
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hf_http_response, 0, 0, 1);
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break;
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case HTTP_REQUEST:
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proto_tree_add_item_hidden(http_tree,
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hf_http_request, 0, 0, 1);
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break;
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case HTTP_OTHERS:
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default:
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break;
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}
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if (data < dataend) {
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if (is_ipp)
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dissect_ipp(pd, offset, fd, tree);
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else
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dissect_data(&pd[offset], offset, fd, http_tree);
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}
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}
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}
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/*
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* XXX - this won't handle HTTP 0.9 replies, but they're all data
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* anyway.
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*/
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static int
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is_http_request_or_reply(const u_char *data, int linelen, http_type_t *type)
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{
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if (linelen >= 3) {
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if (strncasecmp(data, "GET", 3) == 0 ||
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strncasecmp(data, "PUT", 3) == 0) {
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if (*type == HTTP_OTHERS)
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*type = HTTP_REQUEST;
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return TRUE;
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}
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}
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if (linelen >= 4) {
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if (strncasecmp(data, "HEAD", 4) == 0 ||
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strncasecmp(data, "POST", 4) == 0) {
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if (*type == HTTP_OTHERS)
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*type = HTTP_REQUEST;
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return TRUE;
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}
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}
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if (linelen >= 5) {
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if (strncasecmp(data, "TRACE", 5) == 0)
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return TRUE;
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if (strncasecmp(data, "HTTP/", 5) == 0) {
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if (*type == HTTP_OTHERS)
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*type = HTTP_RESPONSE;
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return TRUE; /* response */
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}
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}
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if (linelen >= 6) {
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if (strncasecmp(data, "DELETE", 6) == 0) {
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if (*type == HTTP_OTHERS)
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*type = HTTP_REQUEST;
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return TRUE;
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}
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}
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if (linelen >= 7) {
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if (strncasecmp(data, "OPTIONS", 7) == 0) {
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if (*type == HTTP_OTHERS)
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*type = HTTP_REQUEST;
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return TRUE;
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}
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}
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if (linelen >= 7) {
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if (strncasecmp(data, "CONNECT", 7) == 0) {
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if (*type == HTTP_OTHERS)
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*type = HTTP_REQUEST;
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return TRUE;
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}
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}
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return FALSE;
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}
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void
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proto_register_http(void)
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{
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static hf_register_info hf[] = {
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{ &hf_http_response,
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{ "Response", "http.response",
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FT_BOOLEAN, BASE_NONE, NULL, 0x0,
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"TRUE if HTTP response" }},
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{ &hf_http_request,
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{ "Request", "http.request",
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FT_BOOLEAN, BASE_NONE, NULL, 0x0,
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"TRUE if HTTP request" }},
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};
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static gint *ett[] = {
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&ett_http,
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};
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proto_http = proto_register_protocol("Hypertext Transfer Protocol", "http");
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proto_register_field_array(proto_http, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_http(void)
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{
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dissector_add("tcp.port", TCP_PORT_HTTP, dissect_http);
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dissector_add("tcp.port", TCP_ALT_PORT_HTTP, dissect_http);
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dissector_add("tcp.port", TCP_PORT_PROXY_HTTP, dissect_http);
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dissector_add("tcp.port", TCP_PORT_PROXY_ADMIN_HTTP, dissect_http);
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}
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