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Unix SMB/CIFS implementation.
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Utility to extract pcap files from samba (log level 10) log files
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Copyright (C) Jelmer Vernooij 2003
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Thanks to Tim Potter for the genial idea
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Portions (from capconvert.c) (C) Andrew Tridgell 1997
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Portions (from text2pcap.c) (C) Ashok Narayanan 2001
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Example use with -h parameter:
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log2pcaphex < samba-log-file | text2pcap -T 139,139 - foo.pcap
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TODO: Have correct IP and TCP checksums.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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/* We don't care about the paranoid malloc checker in this standalone
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#define itoa(a) ((a) < 0xa?'0'+(a):'A' + (a-0xa))
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#define TCPDUMP_MAGIC 0xa1b2c3d4
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/* tcpdump file format */
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struct tcpdump_file_header {
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struct tcpdump_packet {
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uint16 identification;
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static hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 6, 0, 0x01010101, 0x02020202};
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static hdr_tcp_t HDR_TCP = {139, 139, 0, 0, 0x50, 0, 0, 0, 0};
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void print_pcap_header(FILE *out)
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struct tcpdump_file_header h;
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h.magic = TCPDUMP_MAGIC;
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h.snaplen = 102400; /* As long packets as possible */
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h.linktype = 101; /* Raw IP */
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fwrite(&h, sizeof(struct tcpdump_file_header), 1, out);
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void print_pcap_packet(FILE *out, unsigned char *data, long length, long caplen)
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struct tcpdump_packet p;
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fwrite(&p, sizeof(struct tcpdump_packet), 1, out);
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fwrite(data, sizeof(unsigned char), caplen, out);
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void print_hex_packet(FILE *out, unsigned char *data, long length)
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while(cur < length) {
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fprintf(out, "%06lX ", cur);
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for(i = cur; i < length && i < cur + 16; i++) {
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fprintf(out, "%02x ", data[i]);
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void print_netbios_packet(FILE *out, unsigned char *data, long length, long actual_length)
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unsigned char *newdata; long offset = 0;
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newlen = length+sizeof(HDR_IP)+sizeof(HDR_TCP);
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newdata = malloc(newlen);
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HDR_IP.packet_length = htons(newlen);
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HDR_TCP.window = htons(0x2000);
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HDR_TCP.source_port = HDR_TCP.dest_port = htons(139);
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memcpy(newdata+offset, &HDR_IP, sizeof(HDR_IP));offset+=sizeof(HDR_IP);
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memcpy(newdata+offset, &HDR_TCP, sizeof(HDR_TCP));offset+=sizeof(HDR_TCP);
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memcpy(newdata+offset,data,length);
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print_pcap_packet(out, newdata, newlen, actual_length+offset);
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unsigned char *curpacket = NULL;
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long curpacket_len = 0;
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void read_log_msg(FILE *in, unsigned char **_buffer, long *buffersize, long *data_offset, long *data_length)
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unsigned char *buffer;
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assert(fscanf(in, " size=%ld\n", buffersize));
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*buffersize+=4; /* for netbios */
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buffer = malloc(*buffersize);
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memset(buffer, 0, *buffersize);
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memcpy(buffer+2, &buffersize, 2);
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assert(fscanf(in, " smb_com=0x%x\n", &tmp)); buffer[smb_com] = tmp;
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assert(fscanf(in, " smb_rcls=%d\n", &tmp)); buffer[smb_rcls] = tmp;
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assert(fscanf(in, " smb_reh=%d\n", &tmp)); buffer[smb_reh] = tmp;
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assert(fscanf(in, " smb_err=%d\n", &tmp)); memcpy(buffer+smb_err, &tmp, 2);
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assert(fscanf(in, " smb_flg=%d\n", &tmp)); buffer[smb_flg] = tmp;
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assert(fscanf(in, " smb_flg2=%d\n", &tmp)); memcpy(buffer+smb_flg2, &tmp, 2);
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assert(fscanf(in, " smb_tid=%d\n", &tmp)); memcpy(buffer+smb_tid, &tmp, 2);
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assert(fscanf(in, " smb_pid=%d\n", &tmp)); memcpy(buffer+smb_pid, &tmp, 2);
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assert(fscanf(in, " smb_uid=%d\n", &tmp)); memcpy(buffer+smb_uid, &tmp, 2);
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assert(fscanf(in, " smb_mid=%d\n", &tmp)); memcpy(buffer+smb_mid, &tmp, 2);
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assert(fscanf(in, " smt_wct=%d\n", &tmp)); buffer[smb_wct] = tmp;
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for(i = 0; i < buffer[smb_wct]; i++) {
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assert(fscanf(in, " smb_vwv[%*2d]=%*5d (0x%X)\n", &tmp));
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memcpy(buffer+smb_vwv+i*2, &tmp, 2);
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*data_offset = smb_vwv+buffer[smb_wct]*2;
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assert(fscanf(in, " smb_bcc=%ld\n", data_length)); buffer[(*data_offset)] = *data_length;
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long read_log_data(FILE *in, unsigned char *buffer, long data_length)
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long i, addr; char real[2][16]; int ret;
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for(i = 0; i < data_length; i++) {
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if(i != 0) { /* Read data after each line */
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assert(fscanf(in, "%8s %8s", real[0], real[1]) == 2);
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ret = fscanf(in, " [%03lX]", &addr);
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if(!quiet)fprintf(stderr, "Only first %ld bytes are logged, packet trace will be incomplete\nTry a higher log level\n", i);
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if(!fscanf(in, "%02X", &tmp)) {
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if(!quiet)fprintf(stderr, "Only first %ld bytes are logged, packet trace will be incomplete\nTry a higher log level\n", i-1);
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int main (int argc, char **argv)
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const char *infile, *outfile;
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long data_offset, data_length;
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long data_bytes_read = 0;
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struct poptOption long_options[] = {
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{ "quiet", 'q', POPT_ARG_NONE, &quiet, 0, "Be quiet, don't output warnings" },
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{ "hex", 'h', POPT_ARG_NONE, &hexformat, 0, "Output format readable by text2pcap" },
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pc = poptGetContext(NULL, argc, (const char **) argv, long_options,
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POPT_CONTEXT_KEEP_FIRST);
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poptSetOtherOptionHelp(pc, "[<infile> [<outfile>]]");
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while((opt = poptGetNextOpt(pc)) != -1) {
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poptGetArg(pc); /* Drop argv[0], the program name */
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infile = poptGetArg(pc);
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in = fopen(infile, "r");
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outfile = poptGetArg(pc);
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out = fopen(outfile, "w+");
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fprintf(stderr, "Can't find %s, using stdout...\n", outfile);
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if(!outfile) out = stdout;
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if(!hexformat)print_pcap_header(out);
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fgets(buffer, sizeof(buffer), in);
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if(buffer[0] == '[') { /* Header */
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if(strstr(buffer, "show_msg")) {
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if(in_packet == 1)continue;
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read_log_msg(in, &curpacket, &curpacket_len, &data_offset, &data_length);
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} else if(in_packet && strstr(buffer, "dump_data")) {
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data_bytes_read = read_log_data(in, curpacket+data_offset, data_length);
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if(hexformat) print_hex_packet(out, curpacket, curpacket_len);
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else print_netbios_packet(out, curpacket, curpacket_len, data_bytes_read+data_offset);