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
60 static int printable(const char *line, const char *endp);
61
62 int
interpret_http(int flags,char * line,int fraglen)63 interpret_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
132 static int
printable(const char * startp,const char * endp)133 printable(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