Mercurial > dropbear

annotate svr-algo.c @ 69:59d16db56e9f

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author Matt Johnston <matt@ucc.asn.au>
date Thu, 12 Aug 2004 15:41:36 +0000
parents 0969767bca0d
children e3adf4cf5465
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "algo.h"
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2 #include "dbutil.h"
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4 /* match the first algorithm in the comma-separated list in buf which is
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5 * also in localalgos[], or return NULL on failure.
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6 * (*goodguess) is set to 1 if the preferred client/server algos match,
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7 * 0 otherwise. This is used for checking if the kexalgo/hostkeyalgos are
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8 * guessed correctly */
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9 algo_type * svr_buf_match_algo(buffer* buf, algo_type localalgos[],
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10 int *goodguess)
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11 {
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12
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13 unsigned char * algolist = NULL;
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14 unsigned char * remotealgos[MAX_PROPOSED_ALGO];
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15 unsigned int len;
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16 unsigned int count, i, j;
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17 algo_type * ret = NULL;
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18
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19 *goodguess = 0;
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20
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21 /* get the comma-separated list from the buffer ie "algo1,algo2,algo3" */
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22 algolist = buf_getstring(buf, &len);
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23 /* Debug this */
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24 TRACE(("buf_match_algo: %s", algolist));
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25 if (len > MAX_PROPOSED_ALGO*(MAX_NAME_LEN+1)) {
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26 goto out; /* just a sanity check, no other use */
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27 }
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28
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29 /* remotealgos will contain a list of the strings parsed out */
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30 /* We will have at least one string (even if it's just "") */
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31 remotealgos[0] = algolist;
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32 count = 1;
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33 /* Iterate through, replacing ','s with NULs, to split it into
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34 * words. */
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35 for (i = 0; i < len; i++) {
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36 if (algolist[i] == '\0') {
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37 /* someone is trying something strange */
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38 goto out;
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39 }
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40 if (algolist[i] == ',') {
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41 algolist[i] = '\0';
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42 remotealgos[count] = &algolist[i+1];
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43 count++;
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44 }
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45 if (count == MAX_PROPOSED_ALGO) {
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46 break;
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47 }
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48 }
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49
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50 /* iterate and find the first match */
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51 for (i = 0; i < count; i++) {
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52
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53 len = strlen(remotealgos[i]);
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54
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55 for (j = 0; localalgos[j].name != NULL; j++) {
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56 if (localalgos[j].usable) {
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57 if (len == strlen(localalgos[j].name) &&
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58 strncmp(localalgos[j].name, remotealgos[i], len) == 0) {
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59 /* set if it was a good guess */
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60 if (i == 0 && j == 0) {
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61 *goodguess = 1;
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62 }
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63 /* set the algo to return */
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64 ret = &localalgos[j];
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65 goto out;
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66 }
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67 }
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68 }
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69 }
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71 out:
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72 m_free(algolist);
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73 return ret;
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74 }