Mercurial > dropbear
annotate svr-algo.c @ 711:f4232b65b316
Fix "-m none" case where an entire packet fits in a block and can be
read by read_packet_init()
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 20 Mar 2013 23:13:19 +0800 |
parents | 870c63519757 |
children | 3062da90dab8 |
rev | line source |
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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 |
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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 |
26 | 45 *goodguess = 0; |
46 | |
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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)) |
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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 } |