| 1 | #include <stdio.h> |
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| 2 | #include "libtrace.h" |
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| 3 | #include <map> |
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| 4 | |
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| 5 | struct libtrace_packet_t packet; |
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| 6 | int psize; |
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| 7 | |
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| 8 | /** parse an option |
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| 9 | * @param ptr the pointer to the current option |
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| 10 | * @param plen the length of the remaining buffer |
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| 11 | * @param type the type of the option |
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| 12 | * @param optlen the length of the option |
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| 13 | * @param data the data of the option |
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| 14 | * |
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| 15 | * @returns bool true if there is another option (and the fields are filled in) |
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| 16 | */ |
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| 17 | int get_next_option(unsigned char **ptr,int *len, |
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| 18 | unsigned char *type, |
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| 19 | unsigned char *optlen, |
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| 20 | unsigned char **data) |
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| 21 | { |
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| 22 | if (*len<=0) { |
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| 23 | // printf("Missing End of Options\n"); |
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| 24 | return 0; |
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| 25 | } |
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| 26 | *type=**ptr; |
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| 27 | switch(*type) { |
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| 28 | case 0: /* End of options */ |
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| 29 | // printf("End of option\n"); |
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| 30 | return 0; |
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| 31 | case 1: /* Pad */ |
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| 32 | (*ptr)++; |
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| 33 | (*len)--; |
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| 34 | return 1; |
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| 35 | default: |
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| 36 | case 6: // ECHO (obsolete) |
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| 37 | case 7: // ECHO Reply (obsolete) |
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| 38 | case 9: // Partial ordering |
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| 39 | case 10: // Partial ordering service profile |
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| 40 | case 11: // CC |
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| 41 | case 13: // CC.ECHO |
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| 42 | case 14: // Alternative checksum request |
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| 43 | case 15: // Alternative checksum data |
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| 44 | case 16: // Skeeter |
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| 45 | case 17: // Bubba |
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| 46 | case 18: // Trailer checksum |
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| 47 | case 19: // Md5 signature |
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| 48 | case 20: // SCPS capability |
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| 49 | case 21: // Selective NACK |
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| 50 | case 22: // Record boundary |
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| 51 | case 23: // Corruption experienced |
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| 52 | case 24: // SNAP |
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| 53 | case 25: // Unassigned |
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| 54 | case 26: // TCP Compression filter |
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| 55 | printf("Unknown option type (%i)\n",*type); |
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| 56 | case 2: // MSS |
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| 57 | case 3: // WS |
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| 58 | case 4: // SACK permitted |
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| 59 | case 5: // SACK |
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| 60 | case 8: // Timestamp |
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| 61 | case 12: // CC.new |
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| 62 | *optlen = *(*ptr+1); |
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| 63 | if (*optlen<2) { |
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| 64 | printf("Optlen <2?! %i\n",*optlen); |
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| 65 | return 0; // I have no idea wtf is going on |
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| 66 | // with these packets |
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| 67 | } |
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| 68 | (*len)-=(unsigned int)*optlen; |
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| 69 | (*data)=(*ptr+2); |
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| 70 | (*ptr)+=*optlen; |
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| 71 | if (*len<0) { |
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| 72 | printf("Option longer than option area (%i > %i)\n",*optlen,*len+*optlen); |
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| 73 | return 0; |
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| 74 | } |
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| 75 | return 1; |
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| 76 | } |
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| 77 | assert(0); |
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| 78 | } |
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| 79 | |
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| 80 | int main(int argc, char *argv[]) |
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| 81 | { |
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| 82 | struct libtrace_t *trace; |
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| 83 | double last = 0; |
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| 84 | |
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| 85 | trace = trace_create(argv[1]); |
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| 86 | |
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| 87 | for (;;) { |
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| 88 | int psize; |
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| 89 | |
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| 90 | if ((psize = trace_read_packet(trace, &packet)) <= 0) { |
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| 91 | break; |
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| 92 | } |
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| 93 | |
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| 94 | struct libtrace_ip *ipptr = trace_get_ip(&packet); |
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| 95 | |
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| 96 | if (!ipptr) |
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| 97 | continue; |
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| 98 | |
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| 99 | struct libtrace_tcp *tcpptr = trace_get_tcp(&packet); |
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| 100 | |
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| 101 | if (!tcpptr) |
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| 102 | continue; |
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| 103 | |
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| 104 | int plen = (tcpptr->doff*4-sizeof *tcpptr); |
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| 105 | int plen2; |
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| 106 | |
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| 107 | // The len of the section that isn't the tcp header |
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| 108 | plen2 = ((char*)tcpptr - (char*)packet.buffer); |
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| 109 | // Minus the length of the tcp header |
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| 110 | plen2 += sizeof *tcpptr; |
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| 111 | // Now, how much do we have left? |
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| 112 | plen2 = psize - plen2; |
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| 113 | |
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| 114 | if (plen != plen2) { |
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| 115 | printf("Snapped wrong (%i != %i)\n",plen,plen2); |
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| 116 | printf(" %i != %i\n",psize-plen,psize-plen2); |
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| 117 | printf("iph %i tcp->doff %i\n",ipptr->ip_hl,tcpptr->doff); |
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| 118 | printf("psize = %i totlen=%i\n",psize,htons(ipptr->ip_len)); |
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| 119 | } |
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| 120 | |
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| 121 | |
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| 122 | double now=trace_get_seconds(&packet); |
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| 123 | |
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| 124 | if (now-last>60) { |
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| 125 | printf("."); |
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| 126 | fflush(stdout); |
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| 127 | last=now; |
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| 128 | } |
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| 129 | |
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| 130 | } |
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| 131 | |
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| 132 | return 0; |
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| 133 | } |
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