1 | /* Trivial libtrace program that counts the number of HTTP packets in a trace. |
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2 | * Designed to demonstrate the use of trace_get_tcp() |
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3 | */ |
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4 | #include "libtrace.h" |
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5 | #include <stdio.h> |
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6 | #include <inttypes.h> |
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7 | #include <assert.h> |
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8 | #include <getopt.h> |
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9 | |
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10 | uint64_t count = 0; |
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11 | |
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12 | static void per_packet(libtrace_packet_t *packet) |
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13 | { |
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14 | libtrace_tcp_t *tcp; |
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15 | |
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16 | /* Get the TCP header using trace_get_tcp() */ |
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17 | tcp = trace_get_tcp(packet); |
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18 | |
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19 | /* If the packet does not have a TCP header, skip it */ |
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20 | if (tcp == NULL) |
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21 | return; |
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22 | |
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23 | /* Check if either port in the TCP header is 80. Note that we |
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24 | * have to byteswap the port numbers because we are reading directly |
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25 | * out of the zero-copied packet */ |
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26 | if ((ntohs(tcp->source) == 80) || (ntohs(tcp->dest) == 80)) |
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27 | count += 1; |
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28 | } |
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29 | |
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30 | static void libtrace_cleanup(libtrace_t *trace, libtrace_packet_t *packet) { |
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31 | |
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32 | /* It's very important to ensure that we aren't trying to destroy |
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33 | * a NULL structure, so each of the destroy calls will only occur |
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34 | * if the structure exists */ |
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35 | if (trace) |
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36 | trace_destroy(trace); |
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37 | |
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38 | if (packet) |
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39 | trace_destroy_packet(packet); |
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40 | |
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41 | } |
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42 | |
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43 | int main(int argc, char *argv[]) |
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44 | { |
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45 | /* This is essentially the same main function from readdemo.c */ |
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46 | |
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47 | libtrace_t *trace = NULL; |
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48 | libtrace_packet_t *packet = NULL; |
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49 | |
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50 | /* Ensure we have at least one argument after the program name */ |
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51 | if (argc < 2) { |
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52 | fprintf(stderr, "Usage: %s inputURI\n", argv[0]); |
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53 | return 1; |
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54 | } |
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55 | |
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56 | packet = trace_create_packet(); |
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57 | |
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58 | if (packet == NULL) { |
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59 | perror("Creating libtrace packet"); |
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60 | libtrace_cleanup(trace, packet); |
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61 | return 1; |
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62 | } |
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63 | |
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64 | trace = trace_create(argv[1]); |
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65 | |
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66 | if (trace_is_err(trace)) { |
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67 | trace_perror(trace,"Opening trace file"); |
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68 | libtrace_cleanup(trace, packet); |
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69 | return 1; |
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70 | } |
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71 | |
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72 | if (trace_start(trace) == -1) { |
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73 | trace_perror(trace,"Starting trace"); |
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74 | libtrace_cleanup(trace, packet); |
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75 | return 1; |
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76 | } |
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77 | |
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78 | |
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79 | while (trace_read_packet(trace,packet)>0) { |
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80 | per_packet(packet); |
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81 | } |
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82 | |
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83 | |
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84 | if (trace_is_err(trace)) { |
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85 | trace_perror(trace,"Reading packets"); |
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86 | libtrace_cleanup(trace, packet); |
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87 | return 1; |
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88 | } |
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89 | |
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90 | printf("Packet Count = %" PRIu64 "\n", count); |
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91 | |
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92 | libtrace_cleanup(trace, packet); |
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93 | return 0; |
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94 | } |
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95 | |
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