1 /* $OpenBSD: dispatch.c,v 1.21 2006/08/03 03:34:42 deraadt Exp $ */ 2 /* 3 * Copyright (c) 2000 Markus Friedl. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "includes.h" 27 28 #include <sys/types.h> 29 30 #include <signal.h> 31 #include <stdarg.h> 32 33 #include "ssh1.h" 34 #include "ssh2.h" 35 #include "log.h" 36 #include "dispatch.h" 37 #include "packet.h" 38 #include "compat.h" 39 40 #define DISPATCH_MIN 0 41 #define DISPATCH_MAX 255 42 43 dispatch_fn *dispatch[DISPATCH_MAX]; 44 45 void 46 dispatch_protocol_error(int type, u_int32_t seq, void *ctxt) 47 { 48 logit("dispatch_protocol_error: type %d seq %u", type, seq); 49 if (!compat20) 50 fatal("protocol error"); 51 packet_start(SSH2_MSG_UNIMPLEMENTED); 52 packet_put_int(seq); 53 packet_send(); 54 packet_write_wait(); 55 } 56 void 57 dispatch_protocol_ignore(int type, u_int32_t seq, void *ctxt) 58 { 59 logit("dispatch_protocol_ignore: type %d seq %u", type, seq); 60 } 61 void 62 dispatch_init(dispatch_fn *dflt) 63 { 64 u_int i; 65 for (i = 0; i < DISPATCH_MAX; i++) 66 dispatch[i] = dflt; 67 } 68 void 69 dispatch_range(u_int from, u_int to, dispatch_fn *fn) 70 { 71 u_int i; 72 73 for (i = from; i <= to; i++) { 74 if (i >= DISPATCH_MAX) 75 break; 76 dispatch[i] = fn; 77 } 78 } 79 void 80 dispatch_set(int type, dispatch_fn *fn) 81 { 82 dispatch[type] = fn; 83 } 84 void 85 dispatch_run(int mode, volatile sig_atomic_t *done, void *ctxt) 86 { 87 for (;;) { 88 int type; 89 u_int32_t seqnr; 90 91 if (mode == DISPATCH_BLOCK) { 92 type = packet_read_seqnr(&seqnr); 93 } else { 94 type = packet_read_poll_seqnr(&seqnr); 95 if (type == SSH_MSG_NONE) 96 return; 97 } 98 if (type > 0 && type < DISPATCH_MAX && dispatch[type] != NULL) 99 (*dispatch[type])(type, seqnr, ctxt); 100 else 101 packet_disconnect("protocol error: rcvd type %d", type); 102 if (done != NULL && *done) 103 return; 104 } 105 } 106