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 1.16 2003/04/08 20:21:28 itojun Exp $"); 26 27 #include "ssh1.h" 28 #include "ssh2.h" 29 #include "log.h" 30 #include "dispatch.h" 31 #include "packet.h" 32 #include "compat.h" 33 34 #define DISPATCH_MIN 0 35 #define DISPATCH_MAX 255 36 37 dispatch_fn *dispatch[DISPATCH_MAX]; 38 39 void 40 dispatch_protocol_error(int type, u_int32_t seq, void *ctxt) 41 { 42 logit("dispatch_protocol_error: type %d seq %u", type, seq); 43 if (!compat20) 44 fatal("protocol error"); 45 packet_start(SSH2_MSG_UNIMPLEMENTED); 46 packet_put_int(seq); 47 packet_send(); 48 packet_write_wait(); 49 } 50 void 51 dispatch_protocol_ignore(int type, u_int32_t seq, void *ctxt) 52 { 53 logit("dispatch_protocol_ignore: type %d seq %u", type, seq); 54 } 55 void 56 dispatch_init(dispatch_fn *dflt) 57 { 58 u_int i; 59 for (i = 0; i < DISPATCH_MAX; i++) 60 dispatch[i] = dflt; 61 } 62 void 63 dispatch_range(u_int from, u_int to, dispatch_fn *fn) 64 { 65 u_int i; 66 67 for (i = from; i <= to; i++) { 68 if (i >= DISPATCH_MAX) 69 break; 70 dispatch[i] = fn; 71 } 72 } 73 void 74 dispatch_set(int type, dispatch_fn *fn) 75 { 76 dispatch[type] = fn; 77 } 78 void 79 dispatch_run(int mode, int *done, void *ctxt) 80 { 81 for (;;) { 82 int type; 83 u_int32_t seqnr; 84 85 if (mode == DISPATCH_BLOCK) { 86 type = packet_read_seqnr(&seqnr); 87 } else { 88 type = packet_read_poll_seqnr(&seqnr); 89 if (type == SSH_MSG_NONE) 90 return; 91 } 92 if (type > 0 && type < DISPATCH_MAX && dispatch[type] != NULL) 93 (*dispatch[type])(type, seqnr, ctxt); 94 else 95 packet_disconnect("protocol error: rcvd type %d", type); 96 if (done != NULL && *done) 97 return; 98 } 99 } 100