e82f7154 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: ident.c,v 1.1 1999/07/01 08:56:23 mdw Exp $ |
4 | * |
5 | * Parse replies from RFC931 servers |
6 | * |
7 | * (c) 1999 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the `fw' port forwarder. |
13 | * |
14 | * `fw' is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * `fw' is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with `fw'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: ident.c,v $ |
32 | * Revision 1.1 1999/07/01 08:56:23 mdw |
33 | * Initial revision |
34 | * |
35 | * Revision 1.1.1.1 1999/05/21 22:22:27 mdw |
36 | * Initial import. Code not really finished yet. |
37 | * |
38 | */ |
39 | |
40 | /*----- Header files ------------------------------------------------------*/ |
41 | |
42 | #include <ctype.h> |
43 | #include <stdio.h> |
44 | #include <stdlib.h> |
45 | #include <string.h> |
46 | |
47 | #include "ident.h" |
48 | |
49 | /*----- Main code ---------------------------------------------------------*/ |
50 | |
51 | /* --- @next@ --- * |
52 | * |
53 | * Arguments: @char **pp@ = address of string pointer |
54 | * |
55 | * Returns: Address of next token. |
56 | * |
57 | * Use: Reads the next token from the result string. Tokens are |
58 | * terminated by whitespace, or `:' or `,' characters. The |
59 | * result string has had `\' escapes removed; it's stored in |
60 | * the same memory as the input string. The actual content |
61 | * of the delimiter doesn't seem to be interesting, so it |
62 | * gets thrown away. |
63 | */ |
64 | |
65 | static char *next(char **pp) |
66 | { |
67 | char *p, *q, *r; |
68 | |
69 | /* --- Deal with reads past the end of the string --- */ |
70 | |
71 | if (!*pp) |
72 | return (""); |
73 | |
74 | /* --- Initialize various pointers into the string --- */ |
75 | |
76 | p = q = r = *pp; |
77 | |
78 | /* --- Skip past any leading whitespace --- */ |
79 | |
80 | while (isspace((unsigned char)*p)) |
81 | p++; |
82 | |
83 | /* --- Now start work on the string itself --- */ |
84 | |
85 | for (;;) { |
86 | if (*p == 0 || *p == ':' || *p == ',' || isspace((unsigned char)*p)) |
87 | break; |
88 | else if (*p == '\\') { |
89 | p++; |
90 | if (!*p) { |
91 | *q++ = '\\'; |
92 | break; |
93 | } |
94 | } |
95 | *q++ = *p++; |
96 | } |
97 | |
98 | /* --- Tidy up afterwards --- */ |
99 | |
100 | while (isspace((unsigned char)*p)) |
101 | p++; |
102 | if (*p == 0) |
103 | *pp = 0; |
104 | else if (*p == ':' || *p == ',') |
105 | *pp = p + 1; |
106 | else |
107 | *pp = p; |
108 | *q = 0; |
109 | |
110 | return (r); |
111 | } |
112 | |
113 | /* --- @ident_parse@ --- * |
114 | * |
115 | * Arguments: @char *p@ = pointer to input string from identd |
116 | * @ident *i@ = pointer to output block |
117 | * |
118 | * Returns: --- |
119 | * |
120 | * Use: Parses a result string from an RFC931 (identd) server. |
121 | */ |
122 | |
123 | void ident_parse(char *p, ident *i) |
124 | { |
125 | char *q; |
126 | |
127 | /* --- Read the source and destination port numbers --- */ |
128 | |
129 | i->sport = atoi(next(&p)); |
130 | i->dport = atoi(next(&p)); |
131 | |
132 | /* --- Find out what sort of a reply this is --- */ |
133 | |
134 | q = next(&p); |
135 | if (strcmp(q, "USERID") == 0) { |
136 | i->type = ident_userid; |
137 | i->u.userid.os = next(&p); |
138 | i->u.userid.user = next(&p); |
139 | } else if (strcmp(q, "ERROR") == 0) { |
140 | i->type = ident_error; |
141 | i->u.error = next(&p); |
142 | } else |
143 | i->type = ident_bad; |
144 | } |
145 | |
146 | /*----- That's all, folks -------------------------------------------------*/ |