1 /* 2 * Copyright (c) 2000 Markus Friedl. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 #include "includes.h" 25 RCSID("$OpenBSD: dispatch.c,v 1.15 2002/01/11 13:39:36 markus Exp $"); 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "ssh1.h" 30 #include "ssh2.h" 31 #include "log.h" 32 #include "dispatch.h" 33 #include "packet.h" 34 #include "compat.h" 35 36 #define DISPATCH_MIN 0 37 #define DISPATCH_MAX 255 38 39 dispatch_fn *dispatch[DISPATCH_MAX]; 40 41 void 42 dispatch_protocol_error(int type, u_int32_t seq, void *ctxt) 43 { 44 log("dispatch_protocol_error: type %d seq %u", type, seq); 45 if (!compat20) 46 fatal("protocol error"); 47 packet_start(SSH2_MSG_UNIMPLEMENTED); 48 packet_put_int(seq); 49 packet_send(); 50 packet_write_wait(); 51 } 52 void 53 dispatch_protocol_ignore(int type, u_int32_t seq, void *ctxt) 54 { 55 log("dispatch_protocol_ignore: type %d seq %u", type, seq); 56 } 57 void 58 dispatch_init(dispatch_fn *dflt) 59 { 60 u_int i; 61 for (i = 0; i < DISPATCH_MAX; i++) 62 dispatch[i] = dflt; 63 } 64 void 65 dispatch_range(u_int from, u_int to, dispatch_fn *fn) 66 { 67 u_int i; 68 69 for (i = from; i <= to; i++) { 70 if (i >= DISPATCH_MAX) 71 break; 72 dispatch[i] = fn; 73 } 74 } 75 void 76 dispatch_set(int type, dispatch_fn *fn) 77 { 78 dispatch[type] = fn; 79 } 80 void 81 dispatch_run(int mode, int *done, void *ctxt) 82 { 83 for (;;) { 84 int type; 85 u_int32_t seqnr; 86 87 if (mode == DISPATCH_BLOCK) { 88 type = packet_read_seqnr(&seqnr); 89 } else { 90 type = packet_read_poll_seqnr(&seqnr); 91 if (type == SSH_MSG_NONE) 92 return; 93 } 94 if (type > 0 && type < DISPATCH_MAX && dispatch[type] != NULL) 95 (*dispatch[type])(type, seqnr, ctxt); 96 else 97 packet_disconnect("protocol error: rcvd type %d", type); 98 if (done != NULL && *done) 99 return; 100 } 101 } 102