1*05b00f60SXin Li /*
2*05b00f60SXin Li * Redistribution and use in source and binary forms, with or without
3*05b00f60SXin Li * modification, are permitted provided that: (1) source code
4*05b00f60SXin Li * distributions retain the above copyright notice and this paragraph
5*05b00f60SXin Li * in its entirety, and (2) distributions including binary code include
6*05b00f60SXin Li * the above copyright notice and this paragraph in its entirety in
7*05b00f60SXin Li * the documentation or other materials provided with the distribution.
8*05b00f60SXin Li * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
9*05b00f60SXin Li * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
10*05b00f60SXin Li * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
11*05b00f60SXin Li * FOR A PARTICULAR PURPOSE.
12*05b00f60SXin Li */
13*05b00f60SXin Li
14*05b00f60SXin Li /* \summary: Secure Shell (SSH) printer */
15*05b00f60SXin Li
16*05b00f60SXin Li #ifdef HAVE_CONFIG_H
17*05b00f60SXin Li #include <config.h>
18*05b00f60SXin Li #endif
19*05b00f60SXin Li
20*05b00f60SXin Li #include "netdissect-stdinc.h"
21*05b00f60SXin Li #include "netdissect-ctype.h"
22*05b00f60SXin Li
23*05b00f60SXin Li #include "netdissect.h"
24*05b00f60SXin Li #include "extract.h"
25*05b00f60SXin Li
26*05b00f60SXin Li static int
ssh_print_version(netdissect_options * ndo,const u_char * pptr,u_int len)27*05b00f60SXin Li ssh_print_version(netdissect_options *ndo, const u_char *pptr, u_int len)
28*05b00f60SXin Li {
29*05b00f60SXin Li u_int idx = 0;
30*05b00f60SXin Li
31*05b00f60SXin Li if ( GET_U_1(pptr+idx) != 'S' )
32*05b00f60SXin Li return 0;
33*05b00f60SXin Li idx++;
34*05b00f60SXin Li if ( GET_U_1(pptr+idx) != 'S' )
35*05b00f60SXin Li return 0;
36*05b00f60SXin Li idx++;
37*05b00f60SXin Li if ( GET_U_1(pptr+idx) != 'H' )
38*05b00f60SXin Li return 0;
39*05b00f60SXin Li idx++;
40*05b00f60SXin Li if ( GET_U_1(pptr+idx) != '-' )
41*05b00f60SXin Li return 0;
42*05b00f60SXin Li idx++;
43*05b00f60SXin Li
44*05b00f60SXin Li while (idx < len) {
45*05b00f60SXin Li u_char c;
46*05b00f60SXin Li
47*05b00f60SXin Li c = GET_U_1(pptr + idx);
48*05b00f60SXin Li if (c == '\n') {
49*05b00f60SXin Li /*
50*05b00f60SXin Li * LF without CR; end of line.
51*05b00f60SXin Li * Skip the LF and print the line, with the
52*05b00f60SXin Li * exception of the LF.
53*05b00f60SXin Li */
54*05b00f60SXin Li goto print;
55*05b00f60SXin Li } else if (c == '\r') {
56*05b00f60SXin Li /* CR - any LF? */
57*05b00f60SXin Li if ((idx+1) >= len) {
58*05b00f60SXin Li /* not in this packet */
59*05b00f60SXin Li goto trunc;
60*05b00f60SXin Li }
61*05b00f60SXin Li if (GET_U_1(pptr + idx + 1) == '\n') {
62*05b00f60SXin Li /*
63*05b00f60SXin Li * CR-LF; end of line.
64*05b00f60SXin Li * Skip the CR-LF and print the line, with
65*05b00f60SXin Li * the exception of the CR-LF.
66*05b00f60SXin Li */
67*05b00f60SXin Li goto print;
68*05b00f60SXin Li }
69*05b00f60SXin Li
70*05b00f60SXin Li /*
71*05b00f60SXin Li * CR followed by something else; treat this as
72*05b00f60SXin Li * if it were binary data and don't print it.
73*05b00f60SXin Li */
74*05b00f60SXin Li goto trunc;
75*05b00f60SXin Li } else if (!ND_ASCII_ISPRINT(c) ) {
76*05b00f60SXin Li /*
77*05b00f60SXin Li * Not a printable ASCII character; treat this
78*05b00f60SXin Li * as if it were binary data and don't print it.
79*05b00f60SXin Li */
80*05b00f60SXin Li goto trunc;
81*05b00f60SXin Li }
82*05b00f60SXin Li idx++;
83*05b00f60SXin Li }
84*05b00f60SXin Li trunc:
85*05b00f60SXin Li return -1;
86*05b00f60SXin Li print:
87*05b00f60SXin Li ND_PRINT(": ");
88*05b00f60SXin Li nd_print_protocol_caps(ndo);
89*05b00f60SXin Li ND_PRINT(": %.*s", (int)idx, pptr);
90*05b00f60SXin Li return idx;
91*05b00f60SXin Li }
92*05b00f60SXin Li
93*05b00f60SXin Li void
ssh_print(netdissect_options * ndo,const u_char * pptr,u_int len)94*05b00f60SXin Li ssh_print(netdissect_options *ndo, const u_char *pptr, u_int len)
95*05b00f60SXin Li {
96*05b00f60SXin Li ndo->ndo_protocol = "ssh";
97*05b00f60SXin Li
98*05b00f60SXin Li ssh_print_version(ndo, pptr, len);
99*05b00f60SXin Li }
100