source: tools/tracesplit/tracesplit.c @ 144fc8d

#include <libtrace.h>
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <stdbool.h>
#include <getopt.h>
#include <string.h>

char *strdupcat(char *str,char *app)
{
        str=realloc(str,strlen(str)+strlen(app)+1);
        strcat(str,app);
        return str;
}

char *strdupcati(char *str,int i)
{
        char buffer[64];
        snprintf(buffer,sizeof(buffer),"%i",i);
        return strdupcat(str,buffer);
}

int usage(char *argv)
{
        printf("Usage: %s inputurl [ -c count ] [ -f bpffilter ] [ -b bytes ]\n\t[ -s starttime ] [ -e endtime ] [ -i interval ] outputurl\n",argv);
        printf("\n");
        printf("Splits up traces\n");
        printf("-c count        split every count packets\n");
        printf("-f bpffilter    only output packets that match filter\n");
        printf("-b bytes        split every capture bytes\n");
        printf("-s time         start at starttime\n");
        printf("-e time         end at endtime\n");
        printf("-i seconds      create a new trace every <seconds>\n");
        printf("\n");
        exit(1);
}

int main(int argc, char *argv[])
{
        struct libtrace_filter_t *filter=NULL;
        struct libtrace_out_t *output = NULL;
        struct libtrace_t *input;
        uint64_t count=UINT64_MAX;
        uint64_t bytes=UINT64_MAX;
        uint64_t starttime=0;
        uint64_t endtime=UINT64_MAX;
        uint64_t interval=UINT64_MAX;
        double firsttime=0;
        uint64_t pktcount=0;
        uint64_t totbytes=0;
        uint64_t totbyteslast=0;

        if (argc<2) {
                usage(argv[0]);
                return 1;
        }

        /* Parse command line options */
        while(1) {
                int option_index;
                struct option long_options[] = {
                        { "filter",     1, 0, 'f' },
                        { "count",      1, 0, 'c' },
                        { "bytes",      1, 0, 'b' },
                        { "starttime",  1, 0, 's' },
                        { "endtime",    1, 0, 'e' },
                        { "interval",   1, 0, 'i' },
                        { NULL,         0, 0, 0   },
                };

                int c=getopt_long(argc, argv, "f:c:b:s:e:i:",
                                long_options, &option_index);

                if (c==-1)
                        break;

                switch (c) {
                        case 'f': filter=trace_bpf_setfilter(optarg);
                                break;
                        case 'c': count=atoi(optarg);
                                break;
                        case 'b': bytes=atoi(optarg);
                                break;
                        case 's': starttime=atoi(optarg); /* FIXME: use getdate */
                                  break;
                        case 'e': endtime=atoi(optarg);
                                  break;
                        case 'i': interval=atoi(optarg);
                                  break;
                        default:
                                fprintf(stderr,"Unknown option: %c\n",c);
                                usage(argv[0]);
                                return 1;
                }
        }
        if (optind+2<argc) {
                fprintf(stderr,"missing inputuri or outputuri\n");
                usage(argv[0]);
        }

        output=NULL;
        input=trace_create(argv[optind]);

        while(1) {
                struct libtrace_packet_t packet;
                if (trace_read_packet(input,&packet)<1) {
                        break;
                }


                if (filter && !trace_bpf_filter(filter,&packet)) {
                        continue;
                }

                if (trace_get_seconds(&packet)<starttime) {
                        continue;
                }

                if (trace_get_seconds(&packet)>endtime) {
                        break;
                }

                if (firsttime==0) {
                        firsttime=trace_get_seconds(&packet);
                }

                if (output && trace_get_seconds(&packet)>firsttime+interval) {
                        trace_output_destroy(output);
                        output=NULL;
                        firsttime+=interval;
                }

                pktcount++;
                if (output && pktcount%count==0) {
                        trace_output_destroy(output);
                        output=NULL;
                }

                totbytes+=trace_get_capture_length(&packet);
                if (output && totbytes-totbyteslast>=bytes) {
                        trace_output_destroy(output);
                        output=NULL;
                        totbyteslast=totbytes;
                }

                if (!output) {
                        char *buffer;
                        buffer=strdup(argv[optind+1]);
                        if (interval!=UINT64_MAX) {
                                buffer=strdupcat(buffer,"-");
                                buffer=strdupcati(buffer,firsttime);
                        }
                        if (count!=UINT64_MAX) {
                                buffer=strdupcat(buffer,"-");
                                buffer=strdupcati(buffer,pktcount);
                        }
                        if (bytes!=UINT64_MAX) {
                                static int filenum=0;
                                buffer=strdupcat(buffer,"-");
                                buffer=strdupcati(buffer,++filenum);
                        }
                        output=trace_output_create(buffer);
                        free(buffer);
                }

                trace_write_packet(output,&packet);
        }

        if (!output)
                trace_output_destroy(output);

        return 0;
}