Mercurial > dropbear

annotate svr-algo.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 0cfba3034be5
children 870c63519757
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
74
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1 /*
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2 * Dropbear - a SSH2 server
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3 * SSH client implementation
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4 *
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5 * Copyright (c) 2002,2003 Matt Johnston
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6 * Copyright (c) 2004 by Mihnea Stoenescu
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7 * All rights reserved.
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8 *
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9 * Permission is hereby granted, free of charge, to any person obtaining a copy
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10 * of this software and associated documentation files (the "Software"), to deal
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11 * in the Software without restriction, including without limitation the rights
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12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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13 * copies of the Software, and to permit persons to whom the Software is
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14 * furnished to do so, subject to the following conditions:
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15 *
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16 * The above copyright notice and this permission notice shall be included in
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17 * all copies or substantial portions of the Software.
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18 *
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19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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25 * SOFTWARE. */
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26
4
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27 #include "algo.h"
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28 #include "dbutil.h"
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29
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30 /* match the first algorithm in the comma-separated list in buf which is
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31 * also in localalgos[], or return NULL on failure.
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32 * (*goodguess) is set to 1 if the preferred client/server algos match,
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33 * 0 otherwise. This is used for checking if the kexalgo/hostkeyalgos are
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34 * guessed correctly */
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35 algo_type * svr_buf_match_algo(buffer* buf, algo_type localalgos[],
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36 int *goodguess)
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37 {
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38
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39 unsigned char * algolist = NULL;
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40 unsigned char * remotealgos[MAX_PROPOSED_ALGO];
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41 unsigned int len;
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42 unsigned int count, i, j;
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43 algo_type * ret = NULL;
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44
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45 *goodguess = 0;
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46
4
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47 /* get the comma-separated list from the buffer ie "algo1,algo2,algo3" */
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48 algolist = buf_getstring(buf, &len);
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49 /* Debug this */
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50 TRACE(("buf_match_algo: %s", algolist))
4
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51 if (len > MAX_PROPOSED_ALGO*(MAX_NAME_LEN+1)) {
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52 goto out; /* just a sanity check, no other use */
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53 }
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54
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55 /* remotealgos will contain a list of the strings parsed out */
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56 /* We will have at least one string (even if it's just "") */
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57 remotealgos[0] = algolist;
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58 count = 1;
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59 /* Iterate through, replacing ','s with NULs, to split it into
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60 * words. */
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61 for (i = 0; i < len; i++) {
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62 if (algolist[i] == '\0') {
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63 /* someone is trying something strange */
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64 goto out;
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65 }
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66 if (algolist[i] == ',') {
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67 algolist[i] = '\0';
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68 remotealgos[count] = &algolist[i+1];
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69 count++;
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70 }
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71 if (count == MAX_PROPOSED_ALGO) {
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72 break;
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73 }
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74 }
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75
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76 /* iterate and find the first match */
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77 for (i = 0; i < count; i++) {
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78
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79 len = strlen(remotealgos[i]);
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80
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81 for (j = 0; localalgos[j].name != NULL; j++) {
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82 if (localalgos[j].usable) {
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83 if (len == strlen(localalgos[j].name) &&
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84 strncmp(localalgos[j].name, remotealgos[i], len) == 0) {
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85 /* set if it was a good guess */
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86 if (i == 0 && j == 0) {
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87 *goodguess = 1;
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88 }
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89 /* set the algo to return */
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90 ret = &localalgos[j];
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91 goto out;
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92 }
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93 }
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94 }
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95 }
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96
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97 out:
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98 m_free(algolist);
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99 return ret;
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100 }