| 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 -------------------------------------------------*/ |