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
  33 /* We don't care about the paranoid malloc checker in this standalone
  34    program */
  35 #undef malloc
  36
  37 #include <assert.h>
  38
  39 int quiet = 0;
  40 int hexformat = 0;
  41
  42 #define itoa(a) ((a) < 0xa?'0'+(a):'A' + (a-0xa))
  43
  44 #include <stdlib.h>
  45 #include <unistd.h>
  46 #include <sys/time.h>
  47 #include <stdio.h>
  48 #include <fcntl.h>
  49
  50 #define TCPDUMP_MAGIC 0xa1b2c3d4
  51
  52 /* tcpdump file format */
  53 struct tcpdump_file_header {
  54         uint32 magic;
  55         uint16 major;
  56         uint16 minor;
  57         int32 zone;
  58         uint32 sigfigs;
  59         uint32 snaplen;
  60         uint32 linktype;
  61 };
  62
  63 struct tcpdump_packet {
  64         struct timeval ts;
  65         uint32 caplen;
  66         uint32 len;
  67 };
  68
  69 typedef struct {
  70     uint8  ver_hdrlen;
  71     uint8  dscp;
  72     uint16 packet_length;
  73     uint16 identification;
  74     uint8  flags;
  75     uint8  fragment;
  76     uint8  ttl;
  77     uint8  protocol;
  78     uint16 hdr_checksum;
  79     uint32 src_addr;
  80     uint32 dest_addr;
  81 } hdr_ip_t;
  82
  83 static hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 6, 0, 0x01010101, 0x02020202};
  84
  85 typedef struct {
  86     uint16 source_port;
  87     uint16 dest_port;
  88     uint32 seq_num;
  89     uint32 ack_num;
  90     uint8  hdr_length;
  91     uint8  flags;
  92     uint16 window;
  93     uint16 checksum;
  94     uint16 urg;
  95 } hdr_tcp_t;
  96
  97 static hdr_tcp_t HDR_TCP = {139, 139, 0, 0, 0x50, 0, 0, 0, 0};
  98
  99 void print_pcap_header(FILE *out)
 100 {
 101         struct tcpdump_file_header h;
 102         h.magic = TCPDUMP_MAGIC;
 103         h.major = 2;
 104         h.minor = 4;
 105         h.zone = 0;
 106         h.sigfigs = 0;
 107         h.snaplen = 102400; /* As long packets as possible */
 108         h.linktype = 101; /* Raw IP */
 109         fwrite(&h, sizeof(struct tcpdump_file_header), 1, out);
 110 }
 111
 112 void print_pcap_packet(FILE *out, unsigned char *data, long length, long caplen)
 113 {
 114         static int i = 0;
 115         struct tcpdump_packet p;
 116         i++;
 117         p.ts.tv_usec = 0;
 118         p.ts.tv_sec = 0;
 119         p.caplen = caplen;
 120         p.len = length;
 121         fwrite(&p, sizeof(struct tcpdump_packet), 1, out);
 122         fwrite(data, sizeof(unsigned char), caplen, out);
 123 }
 124
 125 void print_hex_packet(FILE *out, unsigned char *data, long length)
 126 {
 127         long i,cur = 0;
 128         while(cur < length) {
 129                 fprintf(out, "%06lX ", cur);
 130                 for(i = cur; i < length && i < cur + 16; i++) {
 131                         fprintf(out, "%02x ", data[i]);
 132                 }
 133
 134                 cur = i;
 135                 fprintf(out, "\n");
 136         }
 137 }
 138
 139 void print_netbios_packet(FILE *out, unsigned char *data, long length, long actual_length)
 140 {
 141         unsigned char *newdata; long offset = 0;
 142         long newlen;
 143
 144         newlen = length+sizeof(HDR_IP)+sizeof(HDR_TCP);
 145         newdata = malloc(newlen);
 146
 147         HDR_IP.packet_length = htons(newlen);
 148         HDR_TCP.window = htons(0x2000);
 149         HDR_TCP.source_port = HDR_TCP.dest_port = htons(139);
 150
 151         memcpy(newdata+offset, &HDR_IP, sizeof(HDR_IP));offset+=sizeof(HDR_IP);
 152         memcpy(newdata+offset, &HDR_TCP, sizeof(HDR_TCP));offset+=sizeof(HDR_TCP);
 153         memcpy(newdata+offset,data,length);
 154
 155         print_pcap_packet(out, newdata, newlen, actual_length+offset);
 156         free(newdata);
 157 }
 158
 159 unsigned char *curpacket = NULL;
 160 long curpacket_len = 0;
 161
 162 void read_log_msg(FILE *in, unsigned char **_buffer, long *buffersize, long *data_offset, long *data_length)
 163 {
 164         unsigned char *buffer;
 165         int tmp; long i;
 166         assert(fscanf(in, " size=%ld\n", buffersize));
 167         *buffersize+=4; /* for netbios */
 168         buffer = malloc(*buffersize);
 169         memset(buffer, 0, *buffersize);
 170         /* NetBIOS */
 171         buffer[0] = 0x00;
 172         buffer[1] = 0x00;
 173         memcpy(buffer+2, &buffersize, 2);
 174         buffer[4] = 0xFF;
 175         buffer[5] = 'S';
 176         buffer[6] = 'M';
 177         buffer[7] = 'B';
 178         assert(fscanf(in, "  smb_com=0x%x\n", &tmp)); buffer[smb_com] = tmp;
 179         assert(fscanf(in, "  smb_rcls=%d\n", &tmp)); buffer[smb_rcls] = tmp;
 180         assert(fscanf(in, "  smb_reh=%d\n", &tmp)); buffer[smb_reh] = tmp;
 181         assert(fscanf(in, "  smb_err=%d\n", &tmp)); memcpy(buffer+smb_err, &tmp, 2);
 182         assert(fscanf(in, "  smb_flg=%d\n", &tmp)); buffer[smb_flg] = tmp;
 183         assert(fscanf(in, "  smb_flg2=%d\n", &tmp)); memcpy(buffer+smb_flg2, &tmp, 2);
 184         assert(fscanf(in, "  smb_tid=%d\n", &tmp)); memcpy(buffer+smb_tid, &tmp, 2);
 185         assert(fscanf(in, "  smb_pid=%d\n", &tmp)); memcpy(buffer+smb_pid, &tmp, 2);
 186         assert(fscanf(in, "  smb_uid=%d\n", &tmp)); memcpy(buffer+smb_uid, &tmp, 2);
 187         assert(fscanf(in, "  smb_mid=%d\n", &tmp)); memcpy(buffer+smb_mid, &tmp, 2);
 188         assert(fscanf(in, "  smt_wct=%d\n", &tmp)); buffer[smb_wct] = tmp;
 189         for(i = 0; i < buffer[smb_wct]; i++) {
 190                 assert(fscanf(in, "  smb_vwv[%*2d]=%*5d (0x%X)\n", &tmp));
 191                 memcpy(buffer+smb_vwv+i*2, &tmp, 2);
 192         }
 193
 194         *data_offset = smb_vwv+buffer[smb_wct]*2;
 195         assert(fscanf(in, "  smb_bcc=%ld\n", data_length)); buffer[(*data_offset)] = *data_length;
 196         (*data_offset)+=2;
 197         *_buffer = buffer;
 198 }
 199
 200 long read_log_data(FILE *in, unsigned char *buffer, long data_length)
 201 {
 202         long i, addr; char real[2][16]; int ret;
 203         unsigned char tmp;
 204         for(i = 0; i < data_length; i++) {
 205                 if(i % 16 == 0){
 206                         if(i != 0) { /* Read data after each line */
 207                                 assert(fscanf(in, "%8s %8s", real[0], real[1]) == 2);
 208                         }
 209                         ret = fscanf(in, "  [%03lX]", &addr);
 210                         if(!ret) {
 211                                 if(!quiet)fprintf(stderr, "Only first %ld bytes are logged, packet trace will be incomplete\nTry a higher log level\n", i);
 212                                 return i-1;
 213                         }
 214                         assert(addr == i);
 215                 }
 216                 if(!fscanf(in, "%02lX", &tmp)) {
 217                         if(!quiet)fprintf(stderr, "Only first %ld bytes are logged, packet trace will be incomplete\nTry a higher log level\n", i-1);
 218                         return i-1;
 219                 }
 220                 buffer[i] = tmp;
 221         }
 222         return data_length;
 223 }
 224
 225 int main (int argc, char **argv)
 226 {
 227         const char *infile, *outfile;
 228         FILE *out, *in;
 229         int opt;
 230         poptContext pc;
 231         char buffer[4096];
 232         long data_offset, data_length;
 233         long data_bytes_read;
 234         int in_packet = 0;
 235         struct poptOption long_options[] = {
 236                 POPT_AUTOHELP
 237                 { "quiet", 'q', POPT_ARG_NONE, &quiet, 0, "Be quiet, don't output warnings" },
 238                 { "hex", 'h', POPT_ARG_NONE, &hexformat, 0, "Output format readable by text2pcap" },
 239                 POPT_TABLEEND
 240         };
 241
 242         pc = poptGetContext(NULL, argc, (const char **) argv, long_options,
 243                             POPT_CONTEXT_KEEP_FIRST);
 244         poptSetOtherOptionHelp(pc, "[<infile> [<outfile>]]");
 245
 246
 247         while((opt = poptGetNextOpt(pc)) != -1) {
 248                 switch (opt) {
 249                 }
 250         }
 251
 252         poptGetArg(pc); /* Drop argv[0], the program name */
 253
 254         infile = poptGetArg(pc);
 255
 256         if(infile) {
 257                 in  = fopen(infile, "r");
 258                 if(!in) {
 259                         perror("fopen");
 260                         return 1;
 261                 }
 262         } else in = stdin;
 263
 264         outfile = poptGetArg(pc);
 265
 266         if(outfile) {
 267                 out = fopen(outfile, "w+");
 268                 if(!out) {
 269                         perror("fopen");
 270                         fprintf(stderr, "Can't find %s, using stdout...\n", outfile);
 271                 }
 272         }
 273
 274         if(!outfile) out = stdout;
 275
 276         if(!hexformat)print_pcap_header(out);
 277
 278         while(!feof(in)) {
 279                 fgets(buffer, sizeof(buffer), in);
 280                 if(buffer[0] == '[') { /* Header */
 281                         if(strstr(buffer, "show_msg")) {
 282                                 in_packet++;
 283                                 if(in_packet == 1)continue;
 284                                 read_log_msg(in, &curpacket, &curpacket_len, &data_offset, &data_length);
 285                         } else if(in_packet && strstr(buffer, "dump_data")) {
 286                                 data_bytes_read = read_log_data(in, curpacket+data_offset, data_length);
 287                         }  else {
 288                                 if(in_packet){
 289                                         if(hexformat) print_hex_packet(out, curpacket, curpacket_len);
 290                                         else print_netbios_packet(out, curpacket, curpacket_len, data_bytes_read+data_offset);
 291                                         free(curpacket);
 292                                 }
 293                                 in_packet = 0;
 294                         }
 295                 }
 296         }
 297
 298         return 0;
 299 }