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 <sys/types.h> 27 28 #include <signal.h> 29 #include <stdarg.h> 30 31 #include "ssh1.h" 32 #include "ssh2.h" 33 #include "log.h" 34 #include "dispatch.h" 35 #include "packet.h" 36 #include "compat.h" 37 38 #define DISPATCH_MIN 0 39 #define DISPATCH_MAX 255 40 41 dispatch_fn *dispatch[DISPATCH_MAX]; 42 43 void 44 dispatch_protocol_error(int type, u_int32_t seq, void *ctxt) 45 { 46 logit("dispatch_protocol_error: type %d seq %u", type, seq); 47 if (!compat20) 48 fatal("protocol error"); 49 packet_start(SSH2_MSG_UNIMPLEMENTED); 50 packet_put_int(seq); 51 packet_send(); 52 packet_write_wait(); 53 } 54 void 55 dispatch_protocol_ignore(int type, u_int32_t seq, void *ctxt) 56 { 57 logit("dispatch_protocol_ignore: type %d seq %u", type, seq); 58 } 59 void 60 dispatch_init(dispatch_fn *dflt) 61 { 62 u_int i; 63 for (i = 0; i < DISPATCH_MAX; i++) 64 dispatch[i] = dflt; 65 } 66 void 67 dispatch_range(u_int from, u_int to, dispatch_fn *fn) 68 { 69 u_int i; 70 71 for (i = from; i <= to; i++) { 72 if (i >= DISPATCH_MAX) 73 break; 74 dispatch[i] = fn; 75 } 76 } 77 void 78 dispatch_set(int type, dispatch_fn *fn) 79 { 80 dispatch[type] = fn; 81 } 82 void 83 dispatch_run(int mode, volatile sig_atomic_t *done, void *ctxt) 84 { 85 for (;;) { 86 int type; 87 u_int32_t seqnr; 88 89 if (mode == DISPATCH_BLOCK) { 90 type = packet_read_seqnr(&seqnr); 91 } else { 92 type = packet_read_poll_seqnr(&seqnr); 93 if (type == SSH_MSG_NONE) 94 return; 95 } 96 if (type > 0 && type < DISPATCH_MAX && dispatch[type] != NULL) 97 (*dispatch[type])(type, seqnr, ctxt); 98 else 99 packet_disconnect("protocol error: rcvd type %d", type); 100 if (done != NULL && *done) 101 return; 102 } 103 } 104