1 /**-*-C-*-**********************************************************************
5 * Utility to convert an ASCII hexdump into a libpcap-format capture file
7 * (c) Copyright 2001 Ashok Narayanan <ashokn@cisco.com>
9 * $Id: text2pcap.c,v 1.20 2002/07/21 20:27:30 guy Exp $
11 * Ethereal - Network traffic analyzer
12 * By Gerald Combs <gerald@ethereal.com>
13 * Copyright 1998 Gerald Combs
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version 2
18 * of the License, or (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 *******************************************************************************/
31 /*******************************************************************************
33 * This utility reads in an ASCII hexdump of this common format:
35 * 00000000 00 E0 1E A7 05 6F 00 10 5A A0 B9 12 08 00 46 00 .....o..Z.....F.
36 * 00000010 03 68 00 00 00 00 0A 2E EE 33 0F 19 08 7F 0F 19 .h.......3...
\7f..
37 * 00000020 03 80 94 04 00 00 10 01 16 A2 0A 00 03 50 00 0C .............P..
38 * 00000030 01 01 0F 19 03 80 11 01 1E 61 00 0C 03 01 0F 19 .........a......
40 * Each bytestring line consists of an offset, one or more bytes, and
41 * text at the end. An offset is defined as a hex string of more than
42 * two characters. A byte is defined as a hex string of exactly two
43 * characters. The text at the end is ignored, as is any text before
44 * the offset. Bytes read from a bytestring line are added to the
45 * current packet only if all the following conditions are satisfied:
47 * - No text appears between the offset and the bytes (any bytes appearing after
48 * such text would be ignored)
50 * - The offset must be arithmetically correct, i.e. if the offset is 00000020, then
51 * exactly 32 bytes must have been read into this packet before this. If the offset
52 * is wrong, the packet is immediately terminated
54 * A packet start is signalled by a zero offset.
56 * Lines starting with #TEXT2PCAP are directives. These allow the user
57 * to embed instructions into the capture file which allows text2pcap
58 * to take some actions (e.g. specifying the encapsulation
59 * etc.). Currently no directives are implemented.
61 * Lines beginning with # which are not directives are ignored as
62 * comments. Currently all non-hexdump text is ignored by text2pcap;
63 * in the future, text processing may be added, but lines prefixed
64 * with '#' will still be ignored.
66 * The output is a libpcap packet containing Ethernet frames by
67 * default. This program takes options which allow the user to add
68 * dummy Ethernet, IP and UDP headers to the packets in order to allow
69 * dumps of L3 or higher protocols to be decoded.
71 * Considerable flexibility is built into this code to read hexdumps
72 * of slightly different formats. For example, any text prefixing the
73 * hexdump line is dropped (including mail forwarding '>'). The offset
74 * can be any hex number of four digits or greater.
76 * This converter cannot read a single packet greater than 64K. Packet
77 * snaplength is automatically set to 64K.
90 * Just make sure we include the prototype for strptime as well
91 * (needed for glibc 2.2)
98 #ifdef HAVE_SYS_TYPES_H
99 # include <sys/types.h>
106 #ifdef HAVE_NETINET_IN_H
107 # include <netinet/in.h>
110 #ifdef HAVE_WINSOCK2_H
111 # include <winsock2.h>
121 #ifdef NEED_STRPTIME_H
122 # include "strptime.h"
125 #include "text2pcap.h"
127 /*--- Options --------------------------------------------------------------------*/
130 static int debug = 0;
132 static int quiet = FALSE;
134 /* Dummy Ethernet header */
135 static int hdr_ethernet = FALSE;
136 static unsigned long hdr_ethernet_proto = 0;
138 /* Dummy IP header */
139 static int hdr_ip = FALSE;
140 static unsigned long hdr_ip_proto = 0;
142 /* Dummy UDP header */
143 static int hdr_udp = FALSE;
144 static unsigned long hdr_udp_dest = 0;
145 static unsigned long hdr_udp_src = 0;
147 /* Dummy SCTP header */
148 static int hdr_sctp = FALSE;
149 static unsigned long hdr_sctp_src = 0;
150 static unsigned long hdr_sctp_dest = 0;
151 static unsigned long hdr_sctp_tag = 0;
153 /* Dummy DATA chunk header */
154 static int hdr_data_chunk = FALSE;
155 static unsigned char hdr_data_chunk_type = 0;
156 static unsigned char hdr_data_chunk_bits = 3;
157 static unsigned long hdr_data_chunk_tsn = 0;
158 static unsigned short hdr_data_chunk_sid = 0;
159 static unsigned short hdr_data_chunk_ssn = 0;
160 static unsigned long hdr_data_chunk_ppid = 0;
163 /*--- Local date -----------------------------------------------------------------*/
165 /* This is where we store the packet currently being built */
166 #define MAX_PACKET 64000
167 static unsigned char packet_buf[MAX_PACKET];
168 static unsigned long curr_offset = 0;
170 /* This buffer contains strings present before the packet offset 0 */
171 #define PACKET_PREAMBLE_MAX_LEN 2048
172 static unsigned char packet_preamble[PACKET_PREAMBLE_MAX_LEN+1];
173 static int packet_preamble_len = 0;
175 /* Number of packets read and written */
176 static unsigned long num_packets_read = 0;
177 static unsigned long num_packets_written = 0;
179 /* Time code of packet, derived from packet_preamble */
180 static unsigned long ts_sec = 0;
181 static unsigned long ts_usec = 0;
182 static char *ts_fmt = NULL;
185 static char *input_filename;
186 static FILE *input_file = NULL;
188 static char *output_filename;
189 static FILE *output_file = NULL;
191 /* Offset base to parse */
192 static unsigned long offset_base = 16;
196 /* ----- State machine -----------------------------------------------------------*/
198 /* Current state of parser */
200 INIT, /* Waiting for start of new packet */
201 START_OF_LINE, /* Starting from beginning of line */
202 READ_OFFSET, /* Just read the offset */
203 READ_BYTE, /* Just read a byte */
204 READ_TEXT, /* Just read text - ignore until EOL */
206 static parser_state_t state = INIT;
208 static const char *state_str[] = {"Init",
215 static const char *token_str[] = {"",
223 /* ----- Skeleton Packet Headers --------------------------------------------------*/
226 unsigned char src_addr[6];
227 unsigned char dest_addr[6];
228 unsigned short l3pid;
231 static hdr_ethernet_t HDR_ETHERNET = {
232 {0x01, 0x01, 0x01, 0x01, 0x01, 0x01},
233 {0x02, 0x02, 0x02, 0x02, 0x02, 0x02},
237 unsigned char ver_hdrlen;
239 unsigned short packet_length;
240 unsigned short identification;
242 unsigned char fragment;
244 unsigned char protocol;
245 unsigned short hdr_checksum;
246 unsigned long src_addr;
247 unsigned long dest_addr;
250 static hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 0, 0, 0x01010101, 0x02020202};
253 unsigned short source_port;
254 unsigned short dest_port;
255 unsigned short length;
256 unsigned short checksum;
259 static hdr_udp_t HDR_UDP = {0, 0, 0, 0};
262 unsigned short src_port;
263 unsigned short dest_port;
265 unsigned long checksum;
268 static hdr_sctp_t HDR_SCTP = {0, 0, 0, 0};
273 unsigned short length;
280 static hdr_data_chunk_t HDR_DATA_CHUNK = {0, 0, 0, 0, 0, 0, 0};
282 static char tempbuf[64];
284 /*----------------------------------------------------------------------
285 * Stuff for writing a PCap file
287 #define PCAP_MAGIC 0xa1b2c3d4
289 /* "libpcap" file header (minus magic number). */
291 unsigned long magic; /* magic */
292 unsigned short version_major; /* major version number */
293 unsigned short version_minor; /* minor version number */
294 unsigned long thiszone; /* GMT to local correction */
295 unsigned long sigfigs; /* accuracy of timestamps */
296 unsigned long snaplen; /* max length of captured packets, in octets */
297 unsigned long network; /* data link type */
300 /* "libpcap" record header. */
302 unsigned long ts_sec; /* timestamp seconds */
303 unsigned long ts_usec; /* timestamp microseconds */
304 unsigned long incl_len; /* number of octets of packet saved in file */
305 unsigned long orig_len; /* actual length of packet */
308 /* Link-layer type; see net/bpf.h for details */
309 static unsigned long pcap_link_type = 1; /* Default is DLT-EN10MB */
311 /*----------------------------------------------------------------------
312 * Parse a single hex number
313 * Will abort the program if it can't parse the number
314 * Pass in TRUE if this is an offset, FALSE if not
317 parse_num (char *str, int offset)
322 num = strtoul(str, &c, offset ? offset_base : 16);
324 fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
330 /*----------------------------------------------------------------------
331 * Write this byte into current packet
334 write_byte (char *str)
338 num = parse_num(str, FALSE);
339 packet_buf[curr_offset] = num;
343 /*----------------------------------------------------------------------
344 * Remove bytes from the current packet
347 unwrite_bytes (unsigned long nbytes)
349 curr_offset -= nbytes;
352 /*----------------------------------------------------------------------
353 * Compute one's complement checksum (from RFC1071)
355 static unsigned short
356 in_checksum (void *buf, unsigned long count)
358 unsigned long sum = 0;
359 unsigned short *addr = buf;
362 /* This is the inner loop */
363 sum += ntohs(* (unsigned short *) addr++);
367 /* Add left-over byte, if any */
369 sum += * (unsigned char *) addr;
371 /* Fold 32-bit sum to 16 bits */
373 sum = (sum & 0xffff) + (sum >> 16);
378 /* The CRC32C code is taken from draft-ietf-tsvwg-sctpcsum-01.txt.
379 * That code is copyrighted by D. Otis and has been modified.
382 #define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF])
383 static unsigned long crc_c[256] =
385 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
386 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
387 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
388 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
389 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
390 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
391 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
392 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
393 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
394 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
395 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
396 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
397 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
398 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
399 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
400 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
401 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
402 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
403 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
404 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
405 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
406 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
407 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
408 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
409 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
410 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
411 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
412 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
413 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
414 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
415 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
416 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
417 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
418 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
419 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
420 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
421 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
422 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
423 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
424 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
425 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
426 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
427 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
428 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
429 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
430 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
431 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
432 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
433 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
434 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
435 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
436 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
437 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
438 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
439 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
440 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
441 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
442 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
443 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
444 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
445 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
446 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
447 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
448 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L,
452 crc32c(const unsigned char* buf, unsigned int len, unsigned long crc32_init)
458 for (i = 0; i < len; i++)
459 CRC32C(crc32, buf[i]);
465 finalize_crc32c(unsigned long crc32)
467 unsigned long result;
468 unsigned char byte0,byte1,byte2,byte3;
471 byte0 = result & 0xff;
472 byte1 = (result>>8) & 0xff;
473 byte2 = (result>>16) & 0xff;
474 byte3 = (result>>24) & 0xff;
475 result = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
480 number_of_padding_bytes (unsigned long length)
482 unsigned long remainder;
484 remainder = length % 4;
489 return 4 - remainder;
492 /*----------------------------------------------------------------------
493 * Write current packet out
496 write_current_packet (void)
501 int eth_trailer_length = 0;
502 int i, padding_length;
503 struct pcaprec_hdr ph;
505 if (curr_offset > 0) {
506 /* Write the packet */
508 /* Compute packet length */
509 length = curr_offset;
510 if (hdr_data_chunk) { length += sizeof(HDR_DATA_CHUNK) + number_of_padding_bytes(curr_offset); }
511 if (hdr_sctp) { length += sizeof(HDR_SCTP); }
512 if (hdr_udp) { length += sizeof(HDR_UDP); udp_length = length; }
513 if (hdr_ip) { length += sizeof(HDR_IP); ip_length = length; }
515 length += sizeof(HDR_ETHERNET);
518 eth_trailer_length = 60 - length;
523 /* Write PCap header */
525 ph.ts_usec = ts_usec;
526 ph.incl_len = length;
527 ph.orig_len = length;
528 fwrite(&ph, sizeof(ph), 1, output_file);
530 /* Write Ethernet header */
532 HDR_ETHERNET.l3pid = htons(hdr_ethernet_proto);
533 fwrite(&HDR_ETHERNET, sizeof(HDR_ETHERNET), 1, output_file);
536 /* Write IP header */
538 HDR_IP.packet_length = htons(ip_length);
539 HDR_IP.protocol = hdr_ip_proto;
540 HDR_IP.hdr_checksum = 0;
541 HDR_IP.hdr_checksum = in_checksum(&HDR_IP, sizeof(HDR_IP));
542 fwrite(&HDR_IP, sizeof(HDR_IP), 1, output_file);
545 /* Write UDP header */
547 HDR_UDP.source_port = htons(hdr_udp_src);
548 HDR_UDP.dest_port = htons(hdr_udp_dest);
549 HDR_UDP.length = htons(udp_length);
551 fwrite(&HDR_UDP, sizeof(HDR_UDP), 1, output_file);
554 /* Compute DATA chunk header and append padding */
555 if (hdr_data_chunk) {
556 HDR_DATA_CHUNK.type = hdr_data_chunk_type;
557 HDR_DATA_CHUNK.bits = hdr_data_chunk_bits;
558 HDR_DATA_CHUNK.length = htons(curr_offset + sizeof(HDR_DATA_CHUNK));
559 HDR_DATA_CHUNK.tsn = htonl(hdr_data_chunk_tsn);
560 HDR_DATA_CHUNK.sid = htons(hdr_data_chunk_sid);
561 HDR_DATA_CHUNK.ssn = htons(hdr_data_chunk_ssn);
562 HDR_DATA_CHUNK.ppid = htonl(hdr_data_chunk_ppid);
564 padding_length = number_of_padding_bytes(curr_offset);
565 for (i=0; i<padding_length; i++)
569 /* Write SCTP header */
571 HDR_SCTP.src_port = htons(hdr_sctp_src);
572 HDR_SCTP.dest_port = htons(hdr_sctp_dest);
573 HDR_SCTP.tag = htonl(hdr_sctp_tag);
574 HDR_SCTP.checksum = htonl(0);
575 HDR_SCTP.checksum = crc32c((unsigned char *)&HDR_SCTP, sizeof(HDR_SCTP), ~0L);
577 HDR_SCTP.checksum = crc32c((unsigned char *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
578 HDR_SCTP.checksum = htonl(finalize_crc32c(crc32c(packet_buf, curr_offset, HDR_SCTP.checksum)));
580 fwrite(&HDR_SCTP, sizeof(HDR_SCTP), 1, output_file);
583 /* Write DATA chunk header */
584 if (hdr_data_chunk) {
585 fwrite(&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), 1, output_file);
588 fwrite(packet_buf, curr_offset, 1, output_file);
590 /* Write Ethernet trailer */
591 if (hdr_ethernet && eth_trailer_length > 0) {
592 memset(tempbuf, 0, eth_trailer_length);
593 fwrite(tempbuf, eth_trailer_length, 1, output_file);
597 fprintf(stderr, "Wrote packet of %lu bytes\n", curr_offset);
598 num_packets_written ++;
603 /*----------------------------------------------------------------------
604 * Write the PCap file header
607 write_file_header (void)
611 fh.magic = PCAP_MAGIC;
612 fh.version_major = 2;
613 fh.version_minor = 4;
617 fh.network = pcap_link_type;
619 fwrite(&fh, sizeof(fh), 1, output_file);
622 /*----------------------------------------------------------------------
623 * Append a token to the packet preamble.
626 append_to_preamble(char *str)
630 if (packet_preamble_len != 0) {
631 if (packet_preamble_len == PACKET_PREAMBLE_MAX_LEN)
632 return; /* no room to add more preamble */
633 /* Add a blank separator between the previous token and this token. */
634 packet_preamble[packet_preamble_len++] = ' ';
636 toklen = strlen(str);
638 if (packet_preamble_len + toklen > PACKET_PREAMBLE_MAX_LEN)
639 return; /* no room to add the token to the preamble */
640 strcpy(&packet_preamble[packet_preamble_len], str);
641 packet_preamble_len += toklen;
645 /*----------------------------------------------------------------------
646 * Parse the preamble to get the timecode.
649 parse_preamble (void)
658 * If no "-t" flag was specified, don't attempt to parse a packet
659 * preamble to extract a time stamp.
668 * Null-terminate the preamble.
670 packet_preamble[packet_preamble_len] = '\0';
672 /* Ensure preamble has more than two chars before atempting to parse.
673 * This should cover line breaks etc that get counted.
675 if ( strlen(packet_preamble) > 2 ) {
677 * Initialize to the Epoch, just in case not all fields
678 * of the date and time are specified.
682 timecode.tm_hour = 0;
683 timecode.tm_mday = 1;
685 timecode.tm_year = 70;
686 timecode.tm_wday = 0;
687 timecode.tm_yday = 0;
688 timecode.tm_isdst = -1;
690 /* Get Time leaving subseconds */
691 subsecs = strptime( packet_preamble, ts_fmt, &timecode );
692 if (subsecs != NULL) {
693 /* Get the long time from the tm structure */
694 ts_sec = (unsigned long)mktime( &timecode );
696 ts_sec = -1; /* we failed to parse it */
698 /* This will ensure incorrectly parsed dates get set to zero */
699 if ( -1L == (long)ts_sec )
706 /* Parse subseconds */
707 ts_usec = strtol(subsecs, &p, 10);
713 * Convert that number to a number
714 * of microseconds; if it's N digits
715 * long, it's in units of 10^(-N) seconds,
716 * so, to convert it to units of
717 * 10^-6 seconds, we multiply by
720 subseclen = p - subsecs;
723 * *More* than 6 digits; 6-N is
724 * negative, so we divide by
727 for (i = subseclen - 6; i != 0; i--)
729 } else if (subseclen < 6) {
730 for (i = 6 - subseclen; i != 0; i--)
738 /*printf("Format(%s), time(%u), subsecs(%u)\n\n", ts_fmt, ts_sec, ts_usec);*/
741 packet_preamble_len = 0;
744 /*----------------------------------------------------------------------
748 start_new_packet (void)
751 fprintf(stderr, "Start new packet\n");
753 /* Write out the current packet, if required */
754 write_current_packet();
758 /* Ensure we parse the packet preamble as it may contain the time */
762 /*----------------------------------------------------------------------
763 * Process a directive
766 process_directive (char *str)
768 fprintf(stderr, "\n--- Directive [%s] currently unsupported ---\n", str+10);
772 /*----------------------------------------------------------------------
773 * Parse a single token (called from the scanner)
776 parse_token (token_t token, char *str)
781 * This is implemented as a simple state machine of five states.
782 * State transitions are caused by tokens being received from the
783 * scanner. The code should be self_documenting.
787 /* Sanitize - remove all '\r' */
789 if (str!=NULL) { while ((c = strchr(str, '\r')) != NULL) *c=' '; }
791 fprintf(stderr, "(%s, %s \"%s\") -> (",
792 state_str[state], token_str[token], str ? str : "");
797 /* ----- Waiting for new packet -------------------------------------------*/
801 append_to_preamble(str);
804 process_directive(str);
807 num = parse_num(str, TRUE);
809 /* New packet starts here */
819 /* ----- Processing packet, start of new line -----------------------------*/
823 append_to_preamble(str);
826 process_directive(str);
829 num = parse_num(str, TRUE);
831 /* New packet starts here */
834 } else if (num != curr_offset) {
836 * The offset we read isn't the one we expected.
837 * This may only mean that we mistakenly interpreted
838 * some text as byte values (e.g., if the text dump
839 * of packet data included a number with spaces around
840 * it). If the offset is less than what we expected,
841 * assume that's the problem, and throw away the putative
844 if (num < curr_offset) {
845 unwrite_bytes(curr_offset - num);
848 /* Bad offset; switch to INIT state */
850 fprintf(stderr, "Inconsistent offset. Expecting %0lX, got %0lX. Ignoring rest of packet\n",
852 write_current_packet();
863 /* ----- Processing packet, read offset -----------------------------------*/
867 /* Record the byte */
877 state = START_OF_LINE;
884 /* ----- Processing packet, read byte -------------------------------------*/
888 /* Record the byte */
897 state = START_OF_LINE;
904 /* ----- Processing packet, read text -------------------------------------*/
908 state = START_OF_LINE;
916 fprintf(stderr, "FATAL ERROR: Bad state (%d)", state);
921 fprintf(stderr, ", %s)\n", state_str[state]);
925 /*----------------------------------------------------------------------
926 * Print helpstring and exit
929 help (char *progname)
933 "Usage: %s [-h] [-d] [-q] [-o h|o] [-l typenum] [-e l3pid] [-i proto] \n"
934 " [-u srcp,destp] [-s srcp,destp,tag] [-S srcp,destp,tag] [-t timefmt]\n"
935 " <input-filename> <output-filename>\n"
937 "where <input-filename> specifies input filename (use - for standard input)\n"
938 " <output-filename> specifies output filename (use - for standard output)\n"
940 "[options] are one or more of the following \n"
942 " -h : Display this help message \n"
943 " -d : Generate detailed debug of parser states \n"
944 " -o hex|oct : Parse offsets as (h)ex or (o)ctal. Default is hex\n"
945 " -l typenum : Specify link-layer type number. Default is 1 (Ethernet). \n"
946 " See net/bpf.h for list of numbers.\n"
947 " -q : Generate no output at all (automatically turns off -d)\n"
948 " -e l3pid : Prepend dummy Ethernet II header with specified L3PID (in\n"
950 " Example: -e 0x800\n"
951 " -i proto : Prepend dummy IP header with specified IP protocol (in\n"
953 " Automatically prepends Ethernet header as well.\n"
955 " -u srcp,destp : Prepend dummy UDP header with specified dest and source ports\n"
957 " Automatically prepends Ethernet and IP headers as well\n"
958 " Example: -u 30,40\n"
959 " -s srcp,dstp,tag: Prepend dummy SCTP header with specified dest/source ports\n"
960 " and verification tag (in DECIMAL).\n"
961 " Automatically prepends Ethernet and IP headers as well\n"
962 " Example: -s 30,40,34\n"
963 " -S srcp,dstp,ppi: Prepend dummy SCTP header with specified dest/source ports\n"
964 " and verification tag 0. It also prepends a dummy SCTP DATA\n"
965 " chunk header with payload protocol identifier ppi.\n"
966 " Example: -S 30,40,34\n"
967 " -t timefmt : Treats the text before the packet as a date/time code; the\n"
968 " specified argument is a format string of the sort supported\n"
970 " Example: The time \"10:15:14.5476\" has the format code\n"
971 " \"%%H:%%M:%%S.\"\n"
972 " NOTE: The subsecond component delimiter must be specified\n"
973 " (.) but no pattern is required; the remaining number\n"
974 " is assumed to be fractions of a second.\n"
981 /*----------------------------------------------------------------------
985 parse_options (int argc, char *argv[])
990 /* Scan CLI parameters */
991 while ((c = getopt(argc, argv, "dhqe:i:l:o:u:s:S:t:")) != -1) {
993 case '?': help(argv[0]); break;
994 case 'h': help(argv[0]); break;
995 case 'd': if (!quiet) debug++; break;
996 case 'q': quiet = TRUE; debug = FALSE; break;
997 case 'l': pcap_link_type = atoi(optarg); break;
999 if (optarg[0]!='h' && optarg[0] != 'o') {
1000 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
1003 offset_base = (optarg[0]=='o') ? 8 : 16;
1006 hdr_ethernet = TRUE;
1007 if (sscanf(optarg, "%lx", &hdr_ethernet_proto) < 1) {
1008 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
1015 if (sscanf(optarg, "%ld", &hdr_ip_proto) < 1) {
1016 fprintf(stderr, "Bad argument for '-i': %s\n", optarg);
1019 hdr_ethernet = TRUE;
1020 hdr_ethernet_proto = 0x800;
1025 hdr_sctp_src = strtol(optarg, &p, 10);
1026 if (p == optarg || (*p != ',' && *p != '\0')) {
1027 fprintf(stderr, "Bad src port for '-%c'\n", c);
1031 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1036 hdr_sctp_dest = strtol(optarg, &p, 10);
1037 if (p == optarg || (*p != ',' && *p != '\0')) {
1038 fprintf(stderr, "Bad dest port for '-s'\n");
1042 fprintf(stderr, "No tag specified for '-%c'\n", c);
1047 hdr_sctp_tag = strtol(optarg, &p, 10);
1048 if (p == optarg || *p != '\0') {
1049 fprintf(stderr, "Bad tag for '-%c'\n", c);
1055 hdr_ethernet = TRUE;
1056 hdr_ethernet_proto = 0x800;
1060 hdr_data_chunk = TRUE;
1061 hdr_sctp_src = strtol(optarg, &p, 10);
1062 if (p == optarg || (*p != ',' && *p != '\0')) {
1063 fprintf(stderr, "Bad src port for '-%c'\n", c);
1067 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1072 hdr_sctp_dest = strtol(optarg, &p, 10);
1073 if (p == optarg || (*p != ',' && *p != '\0')) {
1074 fprintf(stderr, "Bad dest port for '-s'\n");
1077 fprintf(stderr, "No ppi specified for '-%c'\n", c);
1082 hdr_data_chunk_ppid = strtoul(optarg, &p, 10);
1083 if (p == optarg || *p != '\0') {
1084 fprintf(stderr, "Bad ppi for '-%c'\n", c);
1090 hdr_ethernet = TRUE;
1091 hdr_ethernet_proto = 0x800;
1100 hdr_udp_src = strtol(optarg, &p, 10);
1101 if (p == optarg || (*p != ',' && *p != '\0')) {
1102 fprintf(stderr, "Bad src port for '-u'\n");
1106 fprintf(stderr, "No dest port specified for '-u'\n");
1111 hdr_udp_dest = strtol(optarg, &p, 10);
1112 if (p == optarg || *p != '\0') {
1113 fprintf(stderr, "Bad dest port for '-u'\n");
1118 hdr_ethernet = TRUE;
1119 hdr_ethernet_proto = 0x800;
1127 if (optind >= argc || argc-optind < 2) {
1128 fprintf(stderr, "Must specify input and output filename\n");
1132 if (strcmp(argv[optind], "-")) {
1133 input_filename = strdup(argv[optind]);
1134 input_file = fopen(input_filename, "rb");
1136 fprintf(stderr, "Cannot open file [%s] for reading: %s\n",
1137 input_filename, strerror(errno));
1141 input_filename = "Standard input";
1145 if (strcmp(argv[optind+1], "-")) {
1146 output_filename = strdup(argv[optind+1]);
1147 output_file = fopen(output_filename, "wb");
1149 fprintf(stderr, "Cannot open file [%s] for writing: %s\n",
1150 output_filename, strerror(errno));
1154 output_filename = "Standard output";
1155 output_file = stdout;
1158 /* Some validation */
1159 if (pcap_link_type != 1 && hdr_ethernet) {
1160 fprintf(stderr, "Dummy headers (-e, -i, -u, -s, -S) cannot be specified with link type override (-l)\n");
1164 /* Set up our variables */
1167 input_filename = "Standard input";
1170 output_file = stdout;
1171 output_filename = "Standard output";
1174 /* Display summary of our state */
1176 fprintf(stderr, "Input from: %s\n", input_filename);
1177 fprintf(stderr, "Output to: %s\n", output_filename);
1179 if (hdr_ethernet) fprintf(stderr, "Generate dummy Ethernet header: Protocol: 0x%0lX\n",
1180 hdr_ethernet_proto);
1181 if (hdr_ip) fprintf(stderr, "Generate dummy IP header: Protocol: %ld\n",
1183 if (hdr_udp) fprintf(stderr, "Generate dummy UDP header: Source port: %ld. Dest port: %ld\n",
1184 hdr_udp_src, hdr_udp_dest);
1185 if (hdr_sctp) fprintf(stderr, "Generate dummy SCTP header: Source port: %ld. Dest port: %ld. Tag: %ld\n",
1186 hdr_sctp_src, hdr_sctp_dest, hdr_sctp_tag);
1187 if (hdr_data_chunk) fprintf(stderr, "Generate dummy DATA chunk header: TSN: %lu. SID: %d. SSN: %d. PPID: %lu\n",
1188 hdr_data_chunk_tsn, hdr_data_chunk_sid, hdr_data_chunk_ssn, hdr_data_chunk_ppid);
1192 int main(int argc, char *argv[])
1194 parse_options(argc, argv);
1196 assert(input_file != NULL);
1197 assert(output_file != NULL);
1199 write_file_header();
1204 write_current_packet();
1206 fprintf(stderr, "\n-------------------------\n");
1208 fprintf(stderr, "Read %ld potential packets, wrote %ld packets\n",
1209 num_packets_read, num_packets_written);