2 Unix SMB/CIFS implementation.
3 Utility to extract pcap files from samba (log level 10) log files
5 Copyright (C) Jelmer Vernooij 2003
6 Thanks to Tim Potter for the genial idea
8 Portions (from capconvert.c) (C) Andrew Tridgell 1997
9 Portions (from text2pcap.c) (C) Ashok Narayanan 2001
11 Example use with -h parameter:
12 log2pcaphex < samba-log-file | text2pcap -T 139,139 - foo.pcap
14 TODO: Have correct IP and TCP checksums.
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.
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.
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.
37 #define itoa(a) ((a) < 0xa?'0'+(a):'A' + (a-0xa))
46 #define TCPDUMP_MAGIC 0xa1b2c3d4
48 /* tcpdump file format */
49 struct tcpdump_file_header {
59 struct tcpdump_packet {
69 uint16 identification;
79 static hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 6, 0, 0x01010101, 0x02020202};
93 static hdr_tcp_t HDR_TCP = {139, 139, 0, 0, 0x50, 0, 0, 0, 0};
95 void print_pcap_header(FILE *out)
97 struct tcpdump_file_header h;
98 h.magic = TCPDUMP_MAGIC;
103 h.snaplen = 102400; /* As long packets as possible */
104 h.linktype = 101; /* Raw IP */
105 fwrite(&h, sizeof(struct tcpdump_file_header), 1, out);
108 void print_pcap_packet(FILE *out, unsigned char *data, long length, long caplen)
111 struct tcpdump_packet p;
117 fwrite(&p, sizeof(struct tcpdump_packet), 1, out);
118 fwrite(data, sizeof(unsigned char), caplen, out);
121 void print_hex_packet(FILE *out, unsigned char *data, long length)
124 while(cur < length) {
125 fprintf(out, "%06lX ", cur);
126 for(i = cur; i < length && i < cur + 16; i++) {
127 fprintf(out, "%02x ", data[i]);
135 void print_netbios_packet(FILE *out, unsigned char *data, long length, long actual_length)
137 unsigned char *newdata; long offset = 0;
140 newlen = length+sizeof(HDR_IP)+sizeof(HDR_TCP);
141 newdata = malloc(newlen);
143 HDR_IP.packet_length = htons(newlen);
144 HDR_TCP.window = htons(0x2000);
145 HDR_TCP.source_port = HDR_TCP.dest_port = htons(139);
147 memcpy(newdata+offset, &HDR_IP, sizeof(HDR_IP));offset+=sizeof(HDR_IP);
148 memcpy(newdata+offset, &HDR_TCP, sizeof(HDR_TCP));offset+=sizeof(HDR_TCP);
149 memcpy(newdata+offset,data,length);
151 print_pcap_packet(out, newdata, newlen, actual_length+offset);
155 unsigned char *curpacket = NULL;
156 long curpacket_len = 0;
158 void read_log_msg(FILE *in, unsigned char **_buffer, long *buffersize, long *data_offset, long *data_length)
160 unsigned char *buffer;
162 assert(fscanf(in, " size=%ld\n", buffersize));
163 *buffersize+=4; /* for netbios */
164 buffer = malloc(*buffersize);
165 memset(buffer, 0, *buffersize);
169 memcpy(buffer+2, &buffersize, 2);
174 assert(fscanf(in, " smb_com=0x%x\n", &tmp)); buffer[smb_com] = tmp;
175 assert(fscanf(in, " smb_rcls=%d\n", &tmp)); buffer[smb_rcls] = tmp;
176 assert(fscanf(in, " smb_reh=%d\n", &tmp)); buffer[smb_reh] = tmp;
177 assert(fscanf(in, " smb_err=%d\n", &tmp)); memcpy(buffer+smb_err, &tmp, 2);
178 assert(fscanf(in, " smb_flg=%d\n", &tmp)); buffer[smb_flg] = tmp;
179 assert(fscanf(in, " smb_flg2=%d\n", &tmp)); memcpy(buffer+smb_flg2, &tmp, 2);
180 assert(fscanf(in, " smb_tid=%d\n", &tmp)); memcpy(buffer+smb_tid, &tmp, 2);
181 assert(fscanf(in, " smb_pid=%d\n", &tmp)); memcpy(buffer+smb_pid, &tmp, 2);
182 assert(fscanf(in, " smb_uid=%d\n", &tmp)); memcpy(buffer+smb_uid, &tmp, 2);
183 assert(fscanf(in, " smb_mid=%d\n", &tmp)); memcpy(buffer+smb_mid, &tmp, 2);
184 assert(fscanf(in, " smt_wct=%d\n", &tmp)); buffer[smb_wct] = tmp;
185 for(i = 0; i < buffer[smb_wct]; i++) {
186 assert(fscanf(in, " smb_vwv[%*2d]=%*5d (0x%X)\n", &tmp));
187 memcpy(buffer+smb_vwv+i*2, &tmp, 2);
190 *data_offset = smb_vwv+buffer[smb_wct]*2;
191 assert(fscanf(in, " smb_bcc=%ld\n", data_length)); buffer[(*data_offset)] = *data_length;
196 long read_log_data(FILE *in, unsigned char *buffer, long data_length)
198 long i, addr; char real[2][16]; int ret;
200 for(i = 0; i < data_length; i++) {
202 if(i != 0) { /* Read data after each line */
203 assert(fscanf(in, "%8s %8s", real[0], real[1]) == 2);
205 ret = fscanf(in, " [%03lX]", &addr);
207 if(!quiet)fprintf(stderr, "Only first %ld bytes are logged, packet trace will be incomplete\nTry a higher log level\n", i);
212 if(!fscanf(in, "%02lX", &tmp)) {
213 if(!quiet)fprintf(stderr, "Only first %ld bytes are logged, packet trace will be incomplete\nTry a higher log level\n", i-1);
221 int main (int argc, char **argv)
223 const char *infile, *outfile;
228 long data_offset, data_length;
229 long data_bytes_read;
231 struct poptOption long_options[] = {
233 { "quiet", 'q', POPT_ARG_NONE, &quiet, 0, "Be quiet, don't output warnings" },
234 { "hex", 'h', POPT_ARG_NONE, &hexformat, 0, "Output format readable by text2pcap" },
238 pc = poptGetContext(NULL, argc, (const char **) argv, long_options,
239 POPT_CONTEXT_KEEP_FIRST);
240 poptSetOtherOptionHelp(pc, "[<infile> [<outfile>]]");
243 while((opt = poptGetNextOpt(pc)) != -1) {
248 poptGetArg(pc); /* Drop argv[0], the program name */
250 infile = poptGetArg(pc);
253 in = fopen(infile, "r");
260 outfile = poptGetArg(pc);
263 out = fopen(outfile, "w+");
266 fprintf(stderr, "Can't find %s, using stdout...\n", outfile);
270 if(!outfile) out = stdout;
272 if(!hexformat)print_pcap_header(out);
275 fgets(buffer, sizeof(buffer), in);
276 if(buffer[0] == '[') { /* Header */
277 if(strstr(buffer, "show_msg")) {
279 if(in_packet == 1)continue;
280 read_log_msg(in, &curpacket, &curpacket_len, &data_offset, &data_length);
281 } else if(in_packet && strstr(buffer, "dump_data")) {
282 data_bytes_read = read_log_data(in, curpacket+data_offset, data_length);
285 if(hexformat) print_hex_packet(out, curpacket, curpacket_len);
286 else print_netbios_packet(out, curpacket, curpacket_len, data_bytes_read+data_offset);