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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: bres.h,v 1.2 1999/07/26 23:27:22 mdw Exp $ |
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4 | * |
5 | * Background reverse name resolution |
6 | * |
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7 | * (c) 1999 Straylight/Edgeware |
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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: bres.h,v $ |
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32 | * Revision 1.2 1999/07/26 23:27:22 mdw |
33 | * Change copyright notice. |
34 | * |
35 | * Revision 1.1.1.1 1999/07/01 08:56:23 mdw |
36 | * Initial revision. |
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37 | * |
38 | */ |
39 | |
40 | #ifndef RES_H |
41 | #define RES_H |
42 | |
43 | #ifdef __cplusplus |
44 | extern "C" { |
45 | #endif |
46 | |
47 | /*----- Header files ------------------------------------------------------*/ |
48 | |
49 | #include <sys/types.h> |
50 | |
51 | #include <sys/socket.h> |
52 | #include <netinet/in.h> |
53 | #include <arpa/inet.h> |
54 | |
55 | #include <mLib/sel.h> |
56 | #include <mLib/selbuf.h> |
57 | |
58 | /*----- Data structures ---------------------------------------------------*/ |
59 | |
60 | /* --- Client allocated request block --- */ |
61 | |
62 | typedef struct bres_client { |
63 | struct bres_client *next, *prev; /* Queue of waiting resolve jobs */ |
64 | struct bres_server *rs; /* Pointer to attached server */ |
65 | struct in_addr addr; /* Address to be resolved */ |
66 | void (*func)(const char */*host*/, void */*p*/); /* Handler function */ |
67 | void *p; /* Argument for handler function */ |
68 | } bres_client; |
69 | |
70 | /* --- Server maintained resolver blocks --- */ |
71 | |
72 | typedef struct bres_server { |
73 | struct bres_server *next, *prev; /* Doubly-linked list of servers */ |
74 | pid_t kid; /* Process id of server process */ |
75 | selbuf b; /* Input line-buffer selector */ |
76 | sel_timer t; /* Timeout for idle servers */ |
77 | int fd; /* File descriptor for writing */ |
78 | struct bres_client *rc; /* Pointer to attached client */ |
79 | } bres_server; |
80 | |
81 | /*----- Functions provided ------------------------------------------------*/ |
82 | |
83 | /* --- @bres_abort@ --- * |
84 | * |
85 | * Arguments: @bres_client *rc@ = pointer to client block |
86 | * |
87 | * Returns: --- |
88 | * |
89 | * Use: Removes a queued job. |
90 | */ |
91 | |
92 | extern void bres_abort(bres_client */*rc*/); |
93 | |
94 | /* --- @bres_resolve@ --- * |
95 | * |
96 | * Arguments: @bres_client *rc@ = pointer to client block |
97 | * @struct in_addr addr@ = address to resolve |
98 | * @void (*func)(const char *host, void *p)@ = handler function |
99 | * @void *p@ = argument for handler function |
100 | * |
101 | * Returns: --- |
102 | * |
103 | * Use: Adds a resolver job to the queue. The job will be processed |
104 | * when there's a spare resolver process to deal with it. |
105 | */ |
106 | |
107 | extern void bres_resolve(bres_client */*rc*/, struct in_addr /*addr*/, |
108 | void (*/*func*/)(const char */*host*/, void */*p*/), |
109 | void */*p*/); |
110 | |
111 | /* --- @bres_init@ --- * |
112 | * |
113 | * Arguments: @sel_state *s@ = pointer to select multiplexor |
114 | * |
115 | * Returns: --- |
116 | * |
117 | * Use: Initializes the background resolver for use. |
118 | */ |
119 | |
120 | extern void bres_init(sel_state */*s*/); |
121 | |
122 | /*----- That's all, folks -------------------------------------------------*/ |
123 | |
124 | #ifdef __cplusplus |
125 | } |
126 | #endif |
127 | |
128 | #endif |