text: /*
   * ssl_extraction.c
   *
   * Given a .pcap file, extracts the SSL certificate contained in it.
   *
   * Created on: 19/09/2012
   * =========================================================================
   * Copyright (c) 2016-2019 Daniele De Sensi (d.desensi.software@gmail.com)
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of
   * this software and associated documentation files (the "Software"), to deal in
   * the Software without restriction, including without limitation the rights to
   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
   * of the Software, and to permit persons to whom the Software is furnished to do
   * so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   * =========================================================================
   */
  
  #include <peafowl/peafowl.h>
  #include <pcap.h>
  #include <net/ethernet.h>
  #include <time.h>
  #include <sys/socket.h>
  #include <netinet/in.h>
  #include <arpa/inet.h>
  #include <unistd.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdio.h>
  #include <inttypes.h>
  #include <assert.h>
  
  int main(int argc, char** argv){
    if(argc!=2){
      fprintf(stderr, "Usage: %s pcap_file\n", argv[0]);
      return -1;
    }
    char* pcap_filename=argv[1];
    char errbuf[PCAP_ERRBUF_SIZE];
  
    pfwl_state_t* state=pfwl_init();
    pcap_t *handle=pcap_open_offline(pcap_filename, errbuf);
  
    if(handle==NULL){
      fprintf(stderr, "Couldn't open device %s: %s\n", pcap_filename, errbuf);
      return (2);
    }
  
    const u_char* packet;
    struct pcap_pkthdr header;
  
    pfwl_field_add_L7(state, PFWL_FIELDS_L7_SSL_JA3);
    pfwl_field_add_L7(state, PFWL_FIELDS_L7_SSL_HANDSHAKE_TYPE);
    pfwl_protocol_l2_t dlt = pfwl_convert_pcap_dlt(pcap_datalink(handle));
    while((packet = pcap_next(handle, &header))!=NULL){
      pfwl_dissection_info_t r;
      if(pfwl_dissect_from_L2(state, packet, header.caplen, time(NULL), dlt, &r) >= PFWL_STATUS_OK){
        pfwl_string_t field;
        if(r.l7.protocol == PFWL_PROTO_L7_SSL &&
           !pfwl_field_string_get(r.l7.protocol_fields, PFWL_FIELDS_L7_SSL_JA3, &field)){
          int64_t htype;
          pfwl_field_number_get(r.l7.protocol_fields, PFWL_FIELDS_L7_SSL_HANDSHAKE_TYPE, &htype);
          if(htype == 0x01){
            printf("JA3: %.*s\n", (int) field.length, field.value);
          }else if(htype == 0x02){
            printf("JA3S: %.*s\n", (int) field.length, field.value);
          }
        }
      }
    }
    return 0;
  }
  