source/utils/log2pcaphex.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Utility to extract pcap files from samba (log level 10) log files
   4
   5    Copyright (C) Jelmer Vernooij 2003
   6    Thanks to Tim Potter for the genial idea
   7
   8    Portions (from capconvert.c) (C) Andrew Tridgell 1997
   9    Portions (from text2pcap.c) (C) Ashok Narayanan 2001
  10
  11    Example use with -h parameter:
  12         log2pcaphex < samba-log-file | text2pcap -T 139,139 - foo.pcap
  13
  14    TODO: Have correct IP and TCP checksums.
  15
  16    This program is free software; you can redistribute it and/or modify
  17    it under the terms of the GNU General Public License as published by
  18    the Free Software Foundation; either version 2 of the License, or
  19    (at your option) any later version.
  20
  21    This program is distributed in the hope that it will be useful,
  22    but WITHOUT ANY WARRANTY; without even the implied warranty of
  23    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24    GNU General Public License for more details.
  25
  26    You should have received a copy of the GNU General Public License
  27    along with this program; if not, write to the Free Software
  28    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29 */
  30
  31 #include "includes.h"
  32 #include <assert.h>
  33
  34 int quiet = 0;
  35 int hexformat = 0;
  36
  37 #define itoa(a) ((a) < 0xa?'0'+(a):'A' + (a-0xa))
  38
  39 #include <stdlib.h>
  40 #include <unistd.h>
  41 #include <sys/time.h>
  42 #include <stdio.h>
  43 #include <fcntl.h>
  44
  45 #define TCPDUMP_MAGIC 0xa1b2c3d4
  46
  47 /* tcpdump file format */
  48 struct tcpdump_file_header {
  49         uint32 magic;
  50         uint16 major;
  51         uint16 minor;
  52         int32 zone;
  53         uint32 sigfigs;
  54         uint32 snaplen;
  55         uint32 linktype;
  56 };
  57
  58 struct tcpdump_packet {
  59         struct timeval ts;
  60         uint32 caplen;
  61         uint32 len;
  62 };
  63
  64 typedef struct {
  65     uint8  ver_hdrlen;
  66     uint8  dscp;
  67     uint16 packet_length;
  68     uint16 identification;
  69     uint8  flags;
  70     uint8  fragment;
  71     uint8  ttl;
  72     uint8  protocol;
  73     uint16 hdr_checksum;
  74     uint32 src_addr;
  75     uint32 dest_addr;
  76 } hdr_ip_t;
  77
  78 static hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 6, 0, 0x01010101, 0x02020202};
  79
  80 typedef struct {
  81     uint16 source_port;
  82     uint16 dest_port;
  83     uint32 seq_num;
  84     uint32 ack_num;
  85     uint8  hdr_length;
  86     uint8  flags;
  87     uint16 window;
  88     uint16 checksum;
  89     uint16 urg;
  90 } hdr_tcp_t;
  91
  92 static hdr_tcp_t HDR_TCP = {139, 139, 0, 0, 0x50, 0, 0, 0, 0};
  93
  94 void print_pcap_header(FILE *out)
  95 {
  96         struct tcpdump_file_header h;
  97         h.magic = TCPDUMP_MAGIC;
  98         h.major = 2;
  99         h.minor = 4;
 100         h.zone = 0;
 101         h.sigfigs = 0;
 102         h.snaplen = 102400; /* As long packets as possible */
 103         h.linktype = 101; /* Raw IP */
 104         fwrite(&h, sizeof(struct tcpdump_file_header), 1, out);
 105 }
 106
 107 void print_pcap_packet(FILE *out, unsigned char *data, long length, long caplen)
 108 {
 109         static int i = 0;
 110         struct tcpdump_packet p;
 111         i++;
 112         p.ts.tv_usec = 0;
 113         p.ts.tv_sec = 0;
 114         p.caplen = caplen;
 115         p.len = length;
 116         fwrite(&p, sizeof(struct tcpdump_packet), 1, out);
 117         fwrite(data, sizeof(unsigned char), caplen, out);
 118 }
 119
 120 void print_hex_packet(FILE *out, unsigned char *data, long length)
 121 {
 122         long i,cur = 0;
 123         while(cur < length) {
 124                 fprintf(out, "%06lX ", cur);
 125                 for(i = cur; i < length && i < cur + 16; i++) {
 126                         fprintf(out, "%02x ", data[i]);
 127                 }
 128
 129                 cur = i;
 130                 fprintf(out, "\n");
 131         }
 132 }
 133
 134 void print_netbios_packet(FILE *out, unsigned char *data, long length, long actual_length)
 135 {
 136         unsigned char *newdata; long offset = 0;
 137         long newlen;
 138
 139         newlen = length+sizeof(HDR_IP)+sizeof(HDR_TCP);
 140         newdata = malloc(newlen);
 141
 142         HDR_IP.packet_length = htons(newlen);
 143         HDR_TCP.window = htons(0x2000);
 144         HDR_TCP.source_port = HDR_TCP.dest_port = htons(139);
 145
 146         memcpy(newdata+offset, &HDR_IP, sizeof(HDR_IP));offset+=sizeof(HDR_IP);
 147         memcpy(newdata+offset, &HDR_TCP, sizeof(HDR_TCP));offset+=sizeof(HDR_TCP);
 148         memcpy(newdata+offset,data,length);
 149
 150         print_pcap_packet(out, newdata, newlen, actual_length+offset);
 151         free(newdata);
 152 }
 153
 154 unsigned char *curpacket = NULL;
 155 long curpacket_len = 0;
 156
 157 void read_log_msg(FILE *in, unsigned char **_buffer, long *buffersize, long *data_offset, long *data_length)
 158 {
 159         unsigned char *buffer;
 160         int tmp; long i;
 161         assert(fscanf(in, " size=%ld\n", buffersize));
 162         *buffersize+=4; /* for netbios */
 163         buffer = malloc(*buffersize);
 164         memset(buffer, 0, *buffersize);
 165         /* NetBIOS */
 166         buffer[0] = 0x00;
 167         buffer[1] = 0x00;
 168         memcpy(buffer+2, &buffersize, 2);
 169         buffer[4] = 0xFF;
 170         buffer[5] = 'S';
 171         buffer[6] = 'M';
 172         buffer[7] = 'B';
 173         assert(fscanf(in, "  smb_com=0x%x\n", &tmp)); buffer[smb_com] = tmp;
 174         assert(fscanf(in, "  smb_rcls=%d\n", &tmp)); buffer[smb_rcls] = tmp;
 175         assert(fscanf(in, "  smb_reh=%d\n", &tmp)); buffer[smb_reh] = tmp;
 176         assert(fscanf(in, "  smb_err=%d\n", &tmp)); memcpy(buffer+smb_err, &tmp, 2);
 177         assert(fscanf(in, "  smb_flg=%d\n", &tmp)); buffer[smb_flg] = tmp;
 178         assert(fscanf(in, "  smb_flg2=%d\n", &tmp)); memcpy(buffer+smb_flg2, &tmp, 2);
 179         assert(fscanf(in, "  smb_tid=%d\n", &tmp)); memcpy(buffer+smb_tid, &tmp, 2);
 180         assert(fscanf(in, "  smb_pid=%d\n", &tmp)); memcpy(buffer+smb_pid, &tmp, 2);
 181         assert(fscanf(in, "  smb_uid=%d\n", &tmp)); memcpy(buffer+smb_uid, &tmp, 2);
 182         assert(fscanf(in, "  smb_mid=%d\n", &tmp)); memcpy(buffer+smb_mid, &tmp, 2);
 183         assert(fscanf(in, "  smt_wct=%d\n", &tmp)); buffer[smb_wct] = tmp;
 184         for(i = 0; i < buffer[smb_wct]; i++) {
 185                 assert(fscanf(in, "  smb_vwv[%*2d]=%*5d (0x%X)\n", &tmp));
 186                 memcpy(buffer+smb_vwv+i*2, &tmp, 2);
 187         }
 188
 189         *data_offset = smb_vwv+buffer[smb_wct]*2;
 190         assert(fscanf(in, "  smb_bcc=%ld\n", data_length)); buffer[(*data_offset)] = *data_length;
 191         (*data_offset)+=2;
 192         *_buffer = buffer;
 193 }
 194
 195 long read_log_data(FILE *in, unsigned char *buffer, long data_length)
 196 {
 197         long i, addr; char real[2][16]; int ret;
 198         unsigned char tmp;
 199         for(i = 0; i < data_length; i++) {
 200                 if(i % 16 == 0){
 201                         if(i != 0) { /* Read data after each line */
 202                                 assert(fscanf(in, "%8s %8s", real[0], real[1]) == 2);
 203                         }
 204                         ret = fscanf(in, "  [%03lX]", &addr);
 205                         if(!ret) {
 206                                 if(!quiet)fprintf(stderr, "Only first %ld bytes are logged, packet trace will be incomplete\nTry a higher log level\n", i);
 207                                 return i-1;
 208                         }
 209                         assert(addr == i);
 210                 }
 211                 if(!fscanf(in, "%02lX", &tmp)) {
 212                         if(!quiet)fprintf(stderr, "Only first %ld bytes are logged, packet trace will be incomplete\nTry a higher log level\n", i-1);
 213                         return i-1;
 214                 }
 215                 buffer[i] = tmp;
 216         }
 217         return data_length;
 218 }
 219
 220 int main (int argc, char **argv)
 221 {
 222         const char *infile, *outfile;
 223         FILE *out, *in;
 224         int opt;
 225         poptContext pc;
 226         char buffer[4096];
 227         long data_offset, data_length;
 228         long data_bytes_read;
 229         int in_packet = 0;
 230         struct poptOption long_options[] = {
 231                 POPT_AUTOHELP
 232                 { "quiet", 'q', POPT_ARG_NONE, &quiet, 0, "Be quiet, don't output warnings" },
 233                 { "hex", 'h', POPT_ARG_NONE, &hexformat, 0, "Output format readable by text2pcap" },
 234                 POPT_TABLEEND
 235         };
 236
 237         pc = poptGetContext(NULL, argc, (const char **) argv, long_options,
 238                             POPT_CONTEXT_KEEP_FIRST);
 239         poptSetOtherOptionHelp(pc, "[<infile> [<outfile>]]");
 240
 241
 242         while((opt = poptGetNextOpt(pc)) != -1) {
 243                 switch (opt) {
 244                 }
 245         }
 246
 247         poptGetArg(pc); /* Drop argv[0], the program name */
 248
 249         infile = poptGetArg(pc);
 250
 251         if(infile) {
 252                 in  = fopen(infile, "r");
 253                 if(!in) {
 254                         perror("fopen");
 255                         return 1;
 256                 }
 257         } else in = stdin;
 258
 259         outfile = poptGetArg(pc);
 260
 261         if(outfile) {
 262                 out = fopen(outfile, "w+");
 263                 if(!out) {
 264                         perror("fopen");
 265                         fprintf(stderr, "Can't find %s, using stdout...\n", outfile);
 266                 }
 267         }
 268
 269         if(!outfile) out = stdout;
 270
 271         if(!hexformat)print_pcap_header(out);
 272
 273         while(!feof(in)) {
 274                 fgets(buffer, sizeof(buffer), in);
 275                 if(buffer[0] == '[') { /* Header */
 276                         if(strstr(buffer, "show_msg")) {
 277                                 in_packet++;
 278                                 if(in_packet == 1)continue;
 279                                 read_log_msg(in, &curpacket, &curpacket_len, &data_offset, &data_length);
 280                         } else if(in_packet && strstr(buffer, "dump_data")) {
 281                                 data_bytes_read = read_log_data(in, curpacket+data_offset, data_length);
 282                         }  else {
 283                                 if(in_packet){
 284                                         if(hexformat) print_hex_packet(out, curpacket, curpacket_len);
 285                                         else print_netbios_packet(out, curpacket, curpacket_len, data_bytes_read+data_offset);
 286                                         free(curpacket);
 287                                 }
 288                                 in_packet = 0;
 289                         }
 290                 }
 291         }
 292
 293         return 0;
 294 }