| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: bres.h,v 1.1 1999/07/01 08:56:23 mdw Exp $ |
| 4 | * |
| 5 | * Background reverse name resolution |
| 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: bres.h,v $ |
| 32 | * Revision 1.1 1999/07/01 08:56:23 mdw |
| 33 | * Initial revision |
| 34 | * |
| 35 | */ |
| 36 | |
| 37 | #ifndef RES_H |
| 38 | #define RES_H |
| 39 | |
| 40 | #ifdef __cplusplus |
| 41 | extern "C" { |
| 42 | #endif |
| 43 | |
| 44 | /*----- Header files ------------------------------------------------------*/ |
| 45 | |
| 46 | #include <sys/types.h> |
| 47 | |
| 48 | #include <sys/socket.h> |
| 49 | #include <netinet/in.h> |
| 50 | #include <arpa/inet.h> |
| 51 | |
| 52 | #include <mLib/sel.h> |
| 53 | #include <mLib/selbuf.h> |
| 54 | |
| 55 | /*----- Data structures ---------------------------------------------------*/ |
| 56 | |
| 57 | /* --- Client allocated request block --- */ |
| 58 | |
| 59 | typedef struct bres_client { |
| 60 | struct bres_client *next, *prev; /* Queue of waiting resolve jobs */ |
| 61 | struct bres_server *rs; /* Pointer to attached server */ |
| 62 | struct in_addr addr; /* Address to be resolved */ |
| 63 | void (*func)(const char */*host*/, void */*p*/); /* Handler function */ |
| 64 | void *p; /* Argument for handler function */ |
| 65 | } bres_client; |
| 66 | |
| 67 | /* --- Server maintained resolver blocks --- */ |
| 68 | |
| 69 | typedef struct bres_server { |
| 70 | struct bres_server *next, *prev; /* Doubly-linked list of servers */ |
| 71 | pid_t kid; /* Process id of server process */ |
| 72 | selbuf b; /* Input line-buffer selector */ |
| 73 | sel_timer t; /* Timeout for idle servers */ |
| 74 | int fd; /* File descriptor for writing */ |
| 75 | struct bres_client *rc; /* Pointer to attached client */ |
| 76 | } bres_server; |
| 77 | |
| 78 | /*----- Functions provided ------------------------------------------------*/ |
| 79 | |
| 80 | /* --- @bres_abort@ --- * |
| 81 | * |
| 82 | * Arguments: @bres_client *rc@ = pointer to client block |
| 83 | * |
| 84 | * Returns: --- |
| 85 | * |
| 86 | * Use: Removes a queued job. |
| 87 | */ |
| 88 | |
| 89 | extern void bres_abort(bres_client */*rc*/); |
| 90 | |
| 91 | /* --- @bres_resolve@ --- * |
| 92 | * |
| 93 | * Arguments: @bres_client *rc@ = pointer to client block |
| 94 | * @struct in_addr addr@ = address to resolve |
| 95 | * @void (*func)(const char *host, void *p)@ = handler function |
| 96 | * @void *p@ = argument for handler function |
| 97 | * |
| 98 | * Returns: --- |
| 99 | * |
| 100 | * Use: Adds a resolver job to the queue. The job will be processed |
| 101 | * when there's a spare resolver process to deal with it. |
| 102 | */ |
| 103 | |
| 104 | extern void bres_resolve(bres_client */*rc*/, struct in_addr /*addr*/, |
| 105 | void (*/*func*/)(const char */*host*/, void */*p*/), |
| 106 | void */*p*/); |
| 107 | |
| 108 | /* --- @bres_init@ --- * |
| 109 | * |
| 110 | * Arguments: @sel_state *s@ = pointer to select multiplexor |
| 111 | * |
| 112 | * Returns: --- |
| 113 | * |
| 114 | * Use: Initializes the background resolver for use. |
| 115 | */ |
| 116 | |
| 117 | extern void bres_init(sel_state */*s*/); |
| 118 | |
| 119 | /*----- That's all, folks -------------------------------------------------*/ |
| 120 | |
| 121 | #ifdef __cplusplus |
| 122 | } |
| 123 | #endif |
| 124 | |
| 125 | #endif |