FreeCalypso > hg > freecalypso-sw
annotate rvinterf/libg23/fmtdispatch.c @ 758:3b690364119a
sms_csf.c compiles
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Sat, 11 Oct 2014 22:47:33 +0000 |
parents | 42c91c51ca7f |
children | ca65f5adf1af |
rev | line source |
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1 /* |
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2 * This libg23 module exports the format_g23_packet() function, which |
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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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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, "GPF 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 } |