1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright (c) 1996-1998,2001 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29/*
30 * Protocol interpreter for the Hypertext Transfer Protocol (HTTP)
31 *
32 * Relevant standards:
33 *	Berners-Lee, T., et al: Hypertext Transfer Protocol -- HTTP/1.0.
34 *	    RFC 1945, May 1996
35 *	Fielding, R., et al: Hypertext Transfer Protocol -- HTTP/1.1.
36 *	    RFC 2068, June 1999
37 */
38
39#include <netinet/in.h>
40#include <stdio.h>
41#include <string.h>
42#include <ctype.h>
43#include "snoop.h"
44
45#define	CR	13			/* "carriage return" character */
46#define	LF	10			/* "line feed" character */
47
48/*
49 * Summary lines: packet contents starting with less than MINCHARS
50 * printable characters will not be printed. MAXCHARS is the maximum
51 * number of characters printed.
52 * Detail lines: NLINES is the maximum number of content lines to print
53 */
54#define	MINCHARS	10
55#define	MAXCHARS	80
56#define	NLINES		5
57
58#define	MIN(a, b) (((a) < (b)) ? (a) : (b))
59
60static int printable(const char *line, const char *endp);
61
62int
63interpret_http(int flags, char *line, int fraglen)
64{
65	char *p, *q, *endp;
66	int c;
67	int lineno;
68
69	endp = line + fraglen;
70
71	if (flags & F_SUM) {
72		c = printable(line, endp - 1);
73		if (c < MINCHARS) {
74			(void) snprintf(get_sum_line(), MAXLINE,
75				"HTTP (body)");
76		} else {
77			(void) snprintf(get_sum_line(), MAXLINE,
78			    "HTTP %.*s", MIN(c, MAXCHARS), line);
79		}
80	}
81
82	if (flags & F_DTAIL) {
83		show_header("HTTP: ", "HyperText Transfer Protocol", fraglen);
84		show_space();
85
86		lineno = 0;
87		for (p = line; p < endp && lineno < NLINES; p = q + 1) {
88			c = printable(p, endp - 1);
89
90			/* stop if no printables, except if at line end */
91			if (c == 0 && *p != CR && *p != LF)
92				break;
93
94			/*
95			 * A line may be terminated either by an CR LF sequence
96			 * (DOS, Mac), or by LF alone
97			 */
98
99			q = memchr(p, CR, (endp - p));
100			if (q != NULL) {
101			    if (q < endp - 1 && q[1] == LF)
102				++q;	/* ignore subsequent LF character */
103			} else {
104			    q = memchr(p, LF, (endp - p));
105			    /* no CR/LF: use end of buffer */
106			    if (q == NULL)
107				q = endp - 1;
108			}
109
110			/* truncate lines containing non-printable characters */
111			(void) snprintf(get_line(0, c), get_line_remain(),
112			    "%.*s", c, p);
113			++lineno;
114		}
115
116		if (p < endp)	/* there was more data to be printed */
117			(void) snprintf(get_line(0, 5), get_line_remain(),
118			    "[...]");
119
120		show_space();
121	}
122
123	return (fraglen);
124}
125
126/*
127 * Return the length of the initial string starting with "startp" and
128 * ending with "endp" (inclusively) consisting only of printable
129 * characters.
130 */
131
132static int
133printable(const char *startp, const char *endp)
134{
135	const char *p = startp;
136
137	while (p <= endp && (isprint(*p) || *p == '\t'))
138		p++;
139
140	return (p - startp);
141}
142