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annotate rvinterf/libg23/fmtdispatch.c @ 523:b92febec14aa

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started FC version of l1_cust.c
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Mon, 14 Jul 2014 05:16:14 +0000
parents 28b4d3c9e85d
children 42c91c51ca7f
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332
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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1 /*
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2 * This libg23 module exports the format_g23_packet() function, which
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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3 * validates the packet, then dispatches it to format_g23_trace(),
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4 * format_g23_sysprim() or format_g23_psprim() as appropriate, or
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5 * prints it in raw hex if malformed.
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6 */
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7
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8 #include <sys/types.h>
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9 #include <stdio.h>
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10 #include <string.h>
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11 #include <strings.h>
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12
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13 static int
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14 basic_checks(rxpkt, rxpkt_len)
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15 u_char *rxpkt;
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16 {
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17 int i, c;
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18
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19 if (rxpkt_len < 17)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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20 return(0);
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21 /* check version bits in the header byte */
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22 if ((rxpkt[1] & 0xC0) != 0x80)
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23 return(0);
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24 /* check the length */
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25 c = rxpkt[2] | rxpkt[3] << 8;
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26 if (c + 4 != rxpkt_len)
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27 return(0);
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28 /* ensure that the "from" and "to" are printable ASCII */
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29 for (i = 8; i < 16; i++) {
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30 c = rxpkt[i];
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31 if (c < ' ' || c > '~')
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32 return(0);
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33 }
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34 /* basic checks pass */
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35 return(1);
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36 }
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37
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38 static int
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39 psprim_extra_checks(rxpkt, rxpkt_len)
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40 u_char *rxpkt;
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41 {
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42 int i, c;
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43
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44 if (rxpkt_len < 24)
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45 return(0);
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46 /* "original rcvr" field needs to be printable ASCII */
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47 for (i = 16; i < 20; i++) {
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48 c = rxpkt[i];
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49 if (c < ' ' || c > '~')
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50 return(0);
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51 }
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52 /* checks pass */
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53 return(1);
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54 }
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55
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56 static void
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57 print_malformed(rxpkt, rxpkt_len, outbuf)
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58 u_char *rxpkt;
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59 char *outbuf;
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60 {
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61 int i;
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62 char *dp;
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63
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64 dp = outbuf;
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65 strcpy(dp, "G23 UNK:");
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66 dp += 8;
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67 for (i = 1; i < rxpkt_len; i++) {
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68 sprintf(dp, " %02X", rxpkt[i]);
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69 dp += 3;
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70 }
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71 *dp = '\0';
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72 }
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73
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74 void
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75 format_g23_packet(rxpkt, rxpkt_len, outbuf)
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76 u_char *rxpkt;
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77 char *outbuf;
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78 {
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79 if (!basic_checks(rxpkt, rxpkt_len)) {
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80 print_malformed(rxpkt, rxpkt_len, outbuf);
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81 return;
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82 }
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83 /* dispatch by type */
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84 switch (rxpkt[1] & 0x30) {
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85 case 0x10:
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86 /* PS primitive */
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87 if (psprim_extra_checks(rxpkt, rxpkt_len))
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88 format_g23_psprim(rxpkt, rxpkt_len, outbuf);
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89 else
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90 print_malformed(rxpkt, rxpkt_len, outbuf);
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91 return;
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92 case 0x20:
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93 /* trace */
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94 format_g23_trace(rxpkt, rxpkt_len, outbuf);
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95 return;
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96 case 0x30:
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97 /* system primitive */
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98 format_g23_sysprim(rxpkt, rxpkt_len, outbuf);
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99 return;
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100 default:
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101 print_malformed(rxpkt, rxpkt_len, outbuf);
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102 }
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103 }