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 1.16 2002/04/15 21:53:55 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)
97 #include <sys/types.h>
101 #ifdef HAVE_NETINET_IN_H
102 # include <netinet/in.h>
104 #ifdef HAVE_WINSOCK_H
105 # include <winsock.h>
114 #ifdef NEED_STRPTIME_H
115 # include "strptime.h"
126 #include "text2pcap.h"
128 /*--- Options --------------------------------------------------------------------*/
135 /* Dummy Ethernet header */
136 int hdr_ethernet = FALSE;
137 unsigned long hdr_ethernet_proto = 0;
139 /* Dummy IP header */
141 unsigned long hdr_ip_proto = 0;
143 /* Dummy UDP header */
145 unsigned long hdr_udp_dest = 0;
146 unsigned long hdr_udp_src = 0;
148 /* Dummy SCTP header */
149 int hdr_sctp = FALSE;
150 unsigned long hdr_sctp_src = 0;
151 unsigned long hdr_sctp_dest = 0;
152 unsigned long hdr_sctp_tag = 0;
154 /* Dummy DATA chunk header */
155 int hdr_data_chunk = FALSE;
156 unsigned char hdr_data_chunk_type = 0;
157 unsigned char hdr_data_chunk_bits = 3;
158 unsigned long hdr_data_chunk_tsn = 0;
159 unsigned short hdr_data_chunk_sid = 0;
160 unsigned short hdr_data_chunk_ssn = 0;
161 unsigned long hdr_data_chunk_ppid = 0;
164 /*--- Local date -----------------------------------------------------------------*/
166 /* This is where we store the packet currently being built */
167 #define MAX_PACKET 64000
168 unsigned char packet_buf[MAX_PACKET];
169 unsigned long curr_offset = 0;
171 /* This buffer contains strings present before the packet offset 0 */
172 #define PACKET_PREAMBLE_MAX_LEN 2048
173 static unsigned char packet_preamble[PACKET_PREAMBLE_MAX_LEN+1];
174 static int packet_preamble_len = 0;
176 /* Number of packets read and written */
177 unsigned long num_packets_read = 0;
178 unsigned long num_packets_written = 0;
180 /* Time code of packet, derived from packet_preamble */
181 static unsigned long ts_sec = 0;
182 static unsigned long ts_usec = 0;
183 static char *ts_fmt = NULL;
186 char *input_filename;
187 FILE *input_file = NULL;
189 char *output_filename;
190 FILE *output_file = NULL;
192 /* Offset base to parse */
193 unsigned long offset_base = 16;
197 /* ----- State machine -----------------------------------------------------------*/
199 /* Current state of parser */
201 INIT, /* Waiting for start of new packet */
202 START_OF_LINE, /* Starting from beginning of line */
203 READ_OFFSET, /* Just read the offset */
204 READ_BYTE, /* Just read a byte */
205 READ_TEXT, /* Just read text - ignore until EOL */
207 parser_state_t state = INIT;
209 const char *state_str[] = {"Init",
216 const char *token_str[] = {"",
224 /* ----- Skeleton Packet Headers --------------------------------------------------*/
227 unsigned char src_addr[6];
228 unsigned char dest_addr[6];
229 unsigned short l3pid;
232 hdr_ethernet_t HDR_ETHERNET = {
233 {0x01, 0x01, 0x01, 0x01, 0x01, 0x01},
234 {0x02, 0x02, 0x02, 0x02, 0x02, 0x02},
238 unsigned char ver_hdrlen;
240 unsigned short packet_length;
241 unsigned short identification;
243 unsigned char fragment;
245 unsigned char protocol;
246 unsigned short hdr_checksum;
247 unsigned long src_addr;
248 unsigned long dest_addr;
251 hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 0, 0, 0x01010101, 0x02020202};
254 unsigned short source_port;
255 unsigned short dest_port;
256 unsigned short length;
257 unsigned short checksum;
260 hdr_udp_t HDR_UDP = {0, 0, 0, 0};
263 unsigned short src_port;
264 unsigned short dest_port;
266 unsigned long checksum;
269 hdr_sctp_t HDR_SCTP = {0, 0, 0, 0};
274 unsigned short length;
281 hdr_data_chunk_t HDR_DATA_CHUNK = {0, 0, 0, 0, 0, 0, 0};
285 /*----------------------------------------------------------------------
286 * Stuff for writing a PCap file
288 #define PCAP_MAGIC 0xa1b2c3d4
290 /* "libpcap" file header (minus magic number). */
292 unsigned long magic; /* magic */
293 unsigned short version_major; /* major version number */
294 unsigned short version_minor; /* minor version number */
295 unsigned long thiszone; /* GMT to local correction */
296 unsigned long sigfigs; /* accuracy of timestamps */
297 unsigned long snaplen; /* max length of captured packets, in octets */
298 unsigned long network; /* data link type */
301 /* "libpcap" record header. */
303 unsigned long ts_sec; /* timestamp seconds */
304 unsigned long ts_usec; /* timestamp microseconds */
305 unsigned long incl_len; /* number of octets of packet saved in file */
306 unsigned long orig_len; /* actual length of packet */
309 /* Link-layer type; see net/bpf.h for details */
310 unsigned long pcap_link_type = 1; /* Default is DLT-EN10MB */
312 /*----------------------------------------------------------------------
313 * Parse a single hex number
314 * Will abort the program if it can't parse the number
315 * Pass in TRUE if this is an offset, FALSE if not
318 parse_num (char *str, int offset)
323 num = strtoul(str, &c, offset ? offset_base : 16);
325 fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
331 /*----------------------------------------------------------------------
332 * Write this byte into current packet
335 write_byte (char *str)
339 num = parse_num(str, FALSE);
340 packet_buf[curr_offset] = num;
344 /*----------------------------------------------------------------------
345 * Remove bytes from the current packet
348 unwrite_bytes (unsigned long nbytes)
350 curr_offset -= nbytes;
353 /*----------------------------------------------------------------------
354 * Compute one's complement checksum (from RFC1071)
356 static unsigned short
357 in_checksum (void *buf, unsigned long count)
359 unsigned long sum = 0;
360 unsigned short *addr = buf;
363 /* This is the inner loop */
364 sum += ntohs(* (unsigned short *) addr++);
368 /* Add left-over byte, if any */
370 sum += * (unsigned char *) addr;
372 /* Fold 32-bit sum to 16 bits */
374 sum = (sum & 0xffff) + (sum >> 16);
379 /* The CRC32C code is taken from draft-ietf-tsvwg-sctpcsum-01.txt.
380 * That code is copyrighted by D. Otis and has been modified.
383 #define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF])
384 static unsigned long crc_c[256] =
386 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
387 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
388 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
389 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
390 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
391 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
392 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
393 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
394 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
395 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
396 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
397 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
398 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
399 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
400 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
401 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
402 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
403 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
404 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
405 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
406 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
407 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
408 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
409 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
410 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
411 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
412 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
413 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
414 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
415 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
416 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
417 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
418 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
419 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
420 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
421 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
422 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
423 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
424 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
425 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
426 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
427 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
428 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
429 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
430 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
431 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
432 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
433 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
434 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
435 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
436 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
437 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
438 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
439 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
440 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
441 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
442 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
443 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
444 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
445 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
446 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
447 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
448 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
449 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L,
453 crc32c(const unsigned char* buf, unsigned int len, unsigned long crc32_init)
459 for (i = 0; i < len; i++)
460 CRC32C(crc32, buf[i]);
466 finalize_crc32c(unsigned long crc32)
468 unsigned long result;
469 unsigned char byte0,byte1,byte2,byte3;
472 byte0 = result & 0xff;
473 byte1 = (result>>8) & 0xff;
474 byte2 = (result>>16) & 0xff;
475 byte3 = (result>>24) & 0xff;
476 result = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
481 number_of_padding_bytes (unsigned long length)
483 unsigned long remainder;
485 remainder = length % 4;
490 return 4 - remainder;
493 /*----------------------------------------------------------------------
494 * Write current packet out
497 write_current_packet (void)
502 int eth_trailer_length = 0;
503 int i, padding_length;
504 struct pcaprec_hdr ph;
506 if (curr_offset > 0) {
507 /* Write the packet */
509 /* Compute packet length */
510 length = curr_offset;
511 if (hdr_data_chunk) { length += sizeof(HDR_DATA_CHUNK) + number_of_padding_bytes(curr_offset); }
512 if (hdr_sctp) { length += sizeof(HDR_SCTP); }
513 if (hdr_udp) { length += sizeof(HDR_UDP); udp_length = length; }
514 if (hdr_ip) { length += sizeof(HDR_IP); ip_length = length; }
516 length += sizeof(HDR_ETHERNET);
519 eth_trailer_length = 60 - length;
524 /* Write PCap header */
526 ph.ts_usec = ts_usec;
527 ph.incl_len = length;
528 ph.orig_len = length;
529 fwrite(&ph, sizeof(ph), 1, output_file);
531 /* Write Ethernet header */
533 HDR_ETHERNET.l3pid = htons(hdr_ethernet_proto);
534 fwrite(&HDR_ETHERNET, sizeof(HDR_ETHERNET), 1, output_file);
537 /* Write IP header */
539 HDR_IP.packet_length = htons(ip_length);
540 HDR_IP.protocol = hdr_ip_proto;
541 HDR_IP.hdr_checksum = 0;
542 HDR_IP.hdr_checksum = in_checksum(&HDR_IP, sizeof(HDR_IP));
543 fwrite(&HDR_IP, sizeof(HDR_IP), 1, output_file);
546 /* Write UDP header */
548 HDR_UDP.source_port = htons(hdr_udp_src);
549 HDR_UDP.dest_port = htons(hdr_udp_dest);
550 HDR_UDP.length = htons(udp_length);
552 fwrite(&HDR_UDP, sizeof(HDR_UDP), 1, output_file);
555 /* Compute DATA chunk header and append padding */
556 if (hdr_data_chunk) {
557 HDR_DATA_CHUNK.type = hdr_data_chunk_type;
558 HDR_DATA_CHUNK.bits = hdr_data_chunk_bits;
559 HDR_DATA_CHUNK.length = htons(curr_offset + sizeof(HDR_DATA_CHUNK));
560 HDR_DATA_CHUNK.tsn = htonl(hdr_data_chunk_tsn);
561 HDR_DATA_CHUNK.sid = htons(hdr_data_chunk_sid);
562 HDR_DATA_CHUNK.ssn = htons(hdr_data_chunk_ssn);
563 HDR_DATA_CHUNK.ppid = htonl(hdr_data_chunk_ppid);
565 padding_length = number_of_padding_bytes(curr_offset);
566 for (i=0; i<padding_length; i++)
570 /* Write SCTP header */
572 HDR_SCTP.src_port = htons(hdr_sctp_src);
573 HDR_SCTP.dest_port = htons(hdr_sctp_dest);
574 HDR_SCTP.tag = htonl(hdr_sctp_tag);
575 HDR_SCTP.checksum = htonl(0);
576 HDR_SCTP.checksum = crc32c((unsigned char *)&HDR_SCTP, sizeof(HDR_SCTP), ~0L);
578 HDR_SCTP.checksum = crc32c((unsigned char *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
579 HDR_SCTP.checksum = htonl(finalize_crc32c(crc32c(packet_buf, curr_offset, HDR_SCTP.checksum)));
581 fwrite(&HDR_SCTP, sizeof(HDR_SCTP), 1, output_file);
584 /* Write DATA chunk header */
585 if (hdr_data_chunk) {
586 fwrite(&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), 1, output_file);
589 fwrite(packet_buf, curr_offset, 1, output_file);
591 /* Write Ethernet trailer */
592 if (hdr_ethernet && eth_trailer_length > 0) {
593 memset(tempbuf, 0, eth_trailer_length);
594 fwrite(tempbuf, eth_trailer_length, 1, output_file);
598 fprintf(stderr, "Wrote packet of %lu bytes\n", curr_offset);
599 num_packets_written ++;
604 /*----------------------------------------------------------------------
605 * Write the PCap file header
608 write_file_header (void)
612 fh.magic = PCAP_MAGIC;
613 fh.version_major = 2;
614 fh.version_minor = 4;
618 fh.network = pcap_link_type;
620 fwrite(&fh, sizeof(fh), 1, output_file);
623 /*----------------------------------------------------------------------
624 * Append a token to the packet preamble.
627 append_to_preamble(char *str)
631 if (packet_preamble_len != 0) {
632 if (packet_preamble_len == PACKET_PREAMBLE_MAX_LEN)
633 return; /* no room to add more preamble */
634 /* Add a blank separator between the previous token and this token. */
635 packet_preamble[packet_preamble_len++] = ' ';
637 toklen = strlen(str);
639 if (packet_preamble_len + toklen > PACKET_PREAMBLE_MAX_LEN)
640 return; /* no room to add the token to the preamble */
641 strcpy(&packet_preamble[packet_preamble_len], str);
642 packet_preamble_len += toklen;
646 /*----------------------------------------------------------------------
647 * Parse the preamble to get the timecode.
650 parse_preamble (void)
659 * If no "-t" flag was specified, don't attempt to parse a packet
660 * preamble to extract a time stamp.
669 * Null-terminate the preamble.
671 packet_preamble[packet_preamble_len] = '\0';
673 /* Ensure preamble has more than two chars before atempting to parse.
674 * This should cover line breaks etc that get counted.
676 if ( strlen(packet_preamble) > 2 ) {
678 * Initialize to the Epoch, just in case not all fields
679 * of the date and time are specified.
683 timecode.tm_hour = 0;
684 timecode.tm_mday = 1;
686 timecode.tm_year = 70;
687 timecode.tm_wday = 0;
688 timecode.tm_yday = 0;
689 timecode.tm_isdst = -1;
691 /* Get Time leaving subseconds */
692 subsecs = strptime( packet_preamble, ts_fmt, &timecode );
693 if (subsecs != NULL) {
694 /* Get the long time from the tm structure */
695 ts_sec = (unsigned long)mktime( &timecode );
697 ts_sec = -1; /* we failed to parse it */
699 /* This will ensure incorrectly parsed dates get set to zero */
700 if ( -1L == (long)ts_sec )
707 /* Parse subseconds */
708 ts_usec = strtol(subsecs, &p, 10);
714 * Convert that number to a number
715 * of microseconds; if it's N digits
716 * long, it's in units of 10^(-N) seconds,
717 * so, to convert it to units of
718 * 10^-6 seconds, we multiply by
721 subseclen = p - subsecs;
724 * *More* than 6 digits; 6-N is
725 * negative, so we divide by
728 for (i = subseclen - 6; i != 0; i--)
730 } else if (subseclen < 6) {
731 for (i = 6 - subseclen; i != 0; i--)
739 /*printf("Format(%s), time(%u), subsecs(%u)\n\n", ts_fmt, ts_sec, ts_usec);*/
742 packet_preamble_len = 0;
745 /*----------------------------------------------------------------------
749 start_new_packet (void)
752 fprintf(stderr, "Start new packet\n");
754 /* Write out the current packet, if required */
755 write_current_packet();
759 /* Ensure we parse the packet preamble as it may contain the time */
763 /*----------------------------------------------------------------------
764 * Process a directive
767 process_directive (char *str)
769 fprintf(stderr, "\n--- Directive [%s] currently unsupported ---\n", str+10);
773 /*----------------------------------------------------------------------
774 * Parse a single token (called from the scanner)
777 parse_token (token_t token, char *str)
782 * This is implemented as a simple state machine of five states.
783 * State transitions are caused by tokens being received from the
784 * scanner. The code should be self_documenting.
788 /* Sanitize - remove all '\r' */
790 if (str!=NULL) { while ((c = strchr(str, '\r')) != NULL) *c=' '; }
792 fprintf(stderr, "(%s, %s \"%s\") -> (",
793 state_str[state], token_str[token], str ? str : "");
798 /* ----- Waiting for new packet -------------------------------------------*/
802 append_to_preamble(str);
805 process_directive(str);
808 num = parse_num(str, TRUE);
810 /* New packet starts here */
820 /* ----- Processing packet, start of new line -----------------------------*/
824 append_to_preamble(str);
827 process_directive(str);
830 num = parse_num(str, TRUE);
832 /* New packet starts here */
835 } else if (num != curr_offset) {
837 * The offset we read isn't the one we expected.
838 * This may only mean that we mistakenly interpreted
839 * some text as byte values (e.g., if the text dump
840 * of packet data included a number with spaces around
841 * it). If the offset is less than what we expected,
842 * assume that's the problem, and throw away the putative
845 if (num < curr_offset) {
846 unwrite_bytes(curr_offset - num);
849 /* Bad offset; switch to INIT state */
851 fprintf(stderr, "Inconsistent offset. Expecting %0lX, got %0lX. Ignoring rest of packet\n",
853 write_current_packet();
864 /* ----- Processing packet, read offset -----------------------------------*/
868 /* Record the byte */
878 state = START_OF_LINE;
885 /* ----- Processing packet, read byte -------------------------------------*/
889 /* Record the byte */
898 state = START_OF_LINE;
905 /* ----- Processing packet, read text -------------------------------------*/
909 state = START_OF_LINE;
917 fprintf(stderr, "FATAL ERROR: Bad state (%d)", state);
922 fprintf(stderr, ", %s)\n", state_str[state]);
926 /*----------------------------------------------------------------------
927 * Print helpstring and exit
930 help (char *progname)
934 "Usage: %s [-d] [-q] [-o h|o] [-l typenum] [-e l3pid] [-i proto] \n"
935 " [-u srcp,destp] [-s srcp,destp,tag] [-S srcp,destp,tag] [-t timefmt] <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 " -w filename : Write capfile to <filename>. Default is standard output\n"
943 " -h : Display this help message \n"
944 " -d : Generate detailed debug of parser states \n"
945 " -o hex|oct : Parse offsets as (h)ex or (o)ctal. Default is hex\n"
946 " -l typenum : Specify link-layer type number. Default is 1 (Ethernet). \n"
947 " See net/bpf.h for list of numbers.\n"
948 " -q : Generate no output at all (automatically turns off -d)\n"
949 " -e l3pid : Prepend dummy Ethernet II header with specified L3PID (in HEX)\n"
950 " Example: -e 0x800\n"
951 " -i proto : Prepend dummy IP header with specified IP protocol (in DECIMAL). \n"
952 " Automatically prepends Ethernet header as well. Example: -i 46\n"
953 " -u srcp,destp : Prepend dummy UDP header with specified dest and source ports (in DECIMAL).\n"
954 " Automatically prepends Ethernet and IP headers as well\n"
955 " Example: -u 30,40\n"
956 " -s srcp,dstp,tag: Prepend dummy SCTP header with specified dest/source ports and\n"
957 " verification tag (in DECIMAL).\n"
958 " Automatically prepends Ethernet and IP headers as well\n"
959 " Example: -s 30,40,34\n"
960 " -S srcp,dstp,ppi: Prepend dummy SCTP header with specified dest/source ports and\n"
961 " verification tag 0. It also prepends a dummy SCTP DATA chunk header\n"
962 " with payload protocol identifier ppi.\n"
963 " Example: -S 30,40,34\n"
964 " -t timefmt : Treats the text before the packet as a date/time code; the\n"
965 " specified argument is a format string of the sort supported\n"
967 " Example: The time \"10:15:14.5476\" has the format code\n"
968 " \"%%H:%%M:%%S.\"\n"
969 " NOTE: The subsecond component delimiter must be specified\n"
970 " (.) but no pattern is required; the remaining number\n"
971 " is assumed to be fractions of a second.\n"
978 /*----------------------------------------------------------------------
982 parse_options (int argc, char *argv[])
987 /* Scan CLI parameters */
988 while ((c = getopt(argc, argv, "dqr:w:e:i:l:o:u:s:S:t:")) != -1) {
990 case '?': help(argv[0]); break;
991 case 'h': help(argv[0]); break;
992 case 'd': if (!quiet) debug++; break;
993 case 'q': quiet = TRUE; debug = FALSE; break;
994 case 'l': pcap_link_type = atoi(optarg); break;
996 if (optarg[0]!='h' && optarg[0] != 'o') {
997 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
1000 offset_base = (optarg[0]=='o') ? 8 : 16;
1003 hdr_ethernet = TRUE;
1004 if (sscanf(optarg, "%lx", &hdr_ethernet_proto) < 1) {
1005 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
1012 if (sscanf(optarg, "%ld", &hdr_ip_proto) < 1) {
1013 fprintf(stderr, "Bad argument for '-i': %s\n", optarg);
1016 hdr_ethernet = TRUE;
1017 hdr_ethernet_proto = 0x800;
1022 hdr_sctp_src = strtol(optarg, &p, 10);
1023 if (p == optarg || (*p != ',' && *p != '\0')) {
1024 fprintf(stderr, "Bad src port for '-%c'\n", c);
1028 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1033 hdr_sctp_dest = strtol(optarg, &p, 10);
1034 if (p == optarg || (*p != ',' && *p != '\0')) {
1035 fprintf(stderr, "Bad dest port for '-s'\n");
1039 fprintf(stderr, "No tag specified for '-%c'\n", c);
1044 hdr_sctp_tag = strtol(optarg, &p, 10);
1045 if (p == optarg || *p != '\0') {
1046 fprintf(stderr, "Bad tag for '-%c'\n", c);
1052 hdr_ethernet = TRUE;
1053 hdr_ethernet_proto = 0x800;
1057 hdr_data_chunk = TRUE;
1058 hdr_sctp_src = strtol(optarg, &p, 10);
1059 if (p == optarg || (*p != ',' && *p != '\0')) {
1060 fprintf(stderr, "Bad src port for '-%c'\n", c);
1064 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1069 hdr_sctp_dest = strtol(optarg, &p, 10);
1070 if (p == optarg || (*p != ',' && *p != '\0')) {
1071 fprintf(stderr, "Bad dest port for '-s'\n");
1074 fprintf(stderr, "No ppi specified for '-%c'\n", c);
1079 hdr_data_chunk_ppid = strtoul(optarg, &p, 10);
1080 if (p == optarg || *p != '\0') {
1081 fprintf(stderr, "Bad ppi for '-%c'\n", c);
1087 hdr_ethernet = TRUE;
1088 hdr_ethernet_proto = 0x800;
1097 hdr_udp_src = strtol(optarg, &p, 10);
1098 if (p == optarg || (*p != ',' && *p != '\0')) {
1099 fprintf(stderr, "Bad src port for '-u'\n");
1103 fprintf(stderr, "No dest port specified for '-u'\n");
1108 hdr_udp_dest = strtol(optarg, &p, 10);
1109 if (p == optarg || *p != '\0') {
1110 fprintf(stderr, "Bad dest port for '-u'\n");
1115 hdr_ethernet = TRUE;
1116 hdr_ethernet_proto = 0x800;
1124 if (optind >= argc || argc-optind < 2) {
1125 fprintf(stderr, "Must specify input and output filename\n");
1129 if (strcmp(argv[optind], "-")) {
1130 input_filename = strdup(argv[optind]);
1131 input_file = fopen(input_filename, "rb");
1133 fprintf(stderr, "Cannot open file [%s] for reading: %s\n",
1134 input_filename, strerror(errno));
1138 input_filename = "Standard input";
1142 if (strcmp(argv[optind+1], "-")) {
1143 output_filename = strdup(argv[optind+1]);
1144 output_file = fopen(output_filename, "wb");
1146 fprintf(stderr, "Cannot open file [%s] for writing: %s\n",
1147 output_filename, strerror(errno));
1151 output_filename = "Standard output";
1152 output_file = stdout;
1155 /* Some validation */
1156 if (pcap_link_type != 1 && hdr_ethernet) {
1157 fprintf(stderr, "Dummy headers (-e, -i, -u, -s, -S) cannot be specified with link type override (-l)\n");
1161 /* Set up our variables */
1164 input_filename = "Standard input";
1167 output_file = stdout;
1168 output_filename = "Standard output";
1171 /* Display summary of our state */
1173 fprintf(stderr, "Input from: %s\n", input_filename);
1174 fprintf(stderr, "Output to: %s\n", output_filename);
1176 if (hdr_ethernet) fprintf(stderr, "Generate dummy Ethernet header: Protocol: 0x%0lX\n",
1177 hdr_ethernet_proto);
1178 if (hdr_ip) fprintf(stderr, "Generate dummy IP header: Protocol: %ld\n",
1180 if (hdr_udp) fprintf(stderr, "Generate dummy UDP header: Source port: %ld. Dest port: %ld\n",
1181 hdr_udp_src, hdr_udp_dest);
1182 if (hdr_sctp) fprintf(stderr, "Generate dummy SCTP header: Source port: %ld. Dest port: %ld. Tag: %ld\n",
1183 hdr_sctp_src, hdr_sctp_dest, hdr_sctp_tag);
1184 if (hdr_data_chunk) fprintf(stderr, "Generate dummy DATA chunk header: TSN: %lu. SID: %d. SSN: %d. PPID: %lu\n",
1185 hdr_data_chunk_tsn, hdr_data_chunk_sid, hdr_data_chunk_ssn, hdr_data_chunk_ppid);
1189 int main(int argc, char *argv[])
1191 parse_options(argc, argv);
1193 assert(input_file != NULL);
1194 assert(output_file != NULL);
1196 write_file_header();
1201 write_current_packet();
1203 fprintf(stderr, "\n-------------------------\n");
1205 fprintf(stderr, "Read %ld potential packets, wrote %ld packets\n",
1206 num_packets_read, num_packets_written);