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 /* 28 * Protocol interpreter for the Hypertext Transfer Protocol (HTTP) 29 * 30 * Relevant standards: 31 * Berners-Lee, T., et al: Hypertext Transfer Protocol -- HTTP/1.0. 32 * RFC 1945, May 1996 33 * Fielding, R., et al: Hypertext Transfer Protocol -- HTTP/1.1. 34 * RFC 2068, June 1999 35 */ 36 37 #include <netinet/in.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <ctype.h> 41 #include "snoop.h" 42 43 #define CR 13 /* "carriage return" character */ 44 #define LF 10 /* "line feed" character */ 45 46 /* 47 * Summary lines: packet contents starting with less than MINCHARS 48 * printable characters will not be printed. MAXCHARS is the maximum 49 * number of characters printed. 50 * Detail lines: NLINES is the maximum number of content lines to print 51 */ 52 #define MINCHARS 10 53 #define MAXCHARS 80 54 #define NLINES 5 55 56 #define MIN(a, b) (((a) < (b)) ? (a) : (b)) 57 58 static int printable(const char *line, const char *endp); 59 60 int 61 interpret_http(int flags, char *line, int fraglen) 62 { 63 char *p, *q, *endp; 64 int c; 65 int lineno; 66 67 endp = line + fraglen; 68 69 if (flags & F_SUM) { 70 c = printable(line, endp - 1); 71 if (c < MINCHARS) { 72 (void) snprintf(get_sum_line(), MAXLINE, 73 "HTTP (body)"); 74 } else { 75 (void) snprintf(get_sum_line(), MAXLINE, 76 "HTTP %.*s", MIN(c, MAXCHARS), line); 77 } 78 } 79 80 if (flags & F_DTAIL) { 81 show_header("HTTP: ", "HyperText Transfer Protocol", fraglen); 82 show_space(); 83 84 lineno = 0; 85 for (p = line; p < endp && lineno < NLINES; p = q + 1) { 86 c = printable(p, endp - 1); 87 88 /* stop if no printables, except if at line end */ 89 if (c == 0 && *p != CR && *p != LF) 90 break; 91 92 /* 93 * A line may be terminated either by an CR LF sequence 94 * (DOS, Mac), or by LF alone 95 */ 96 97 q = memchr(p, CR, (endp - p)); 98 if (q != NULL) { 99 if (q < endp - 1 && q[1] == LF) 100 ++q; /* ignore subsequent LF character */ 101 } else { 102 q = memchr(p, LF, (endp - p)); 103 /* no CR/LF: use end of buffer */ 104 if (q == NULL) 105 q = endp - 1; 106 } 107 108 /* truncate lines containing non-printable characters */ 109 (void) snprintf(get_line(0, c), get_line_remain(), 110 "%.*s", c, p); 111 ++lineno; 112 } 113 114 if (p < endp) /* there was more data to be printed */ 115 (void) snprintf(get_line(0, 5), get_line_remain(), 116 "[...]"); 117 118 show_space(); 119 } 120 121 return (fraglen); 122 } 123 124 /* 125 * Return the length of the initial string starting with "startp" and 126 * ending with "endp" (inclusively) consisting only of printable 127 * characters. 128 */ 129 130 static int 131 printable(const char *startp, const char *endp) 132 { 133 const char *p = startp; 134 135 while (p <= endp && (isprint(*p) || *p == '\t')) 136 p++; 137 138 return (p - startp); 139 } 140