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 1.12 2002/01/29 22:57:30 gram 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)
94 #define _XOPEN_SOURCE 500
100 #include <sys/types.h>
104 #ifdef HAVE_NETINET_IN_H
105 # include <netinet/in.h>
107 #ifdef HAVE_WINSOCK_H
108 # include <winsock.h>
117 #ifdef NEED_STRPTIME_H
118 # include "strptime.h"
129 #include "text2pcap.h"
131 /*--- Options --------------------------------------------------------------------*/
138 /* Dummy Ethernet header */
139 int hdr_ethernet = FALSE;
140 unsigned long hdr_ethernet_proto = 0;
142 /* Dummy IP header */
144 unsigned long hdr_ip_proto = 0;
146 /* Dummy UDP header */
148 unsigned long hdr_udp_dest = 0;
149 unsigned long hdr_udp_src = 0;
151 /* Dummy SCTP header */
152 int hdr_sctp = FALSE;
153 unsigned long hdr_sctp_src = 0;
154 unsigned long hdr_sctp_dest = 0;
155 unsigned long hdr_sctp_tag = 0;
157 /* Dummy DATA chunk header */
158 int hdr_data_chunk = FALSE;
159 unsigned char hdr_data_chunk_type = 0;
160 unsigned char hdr_data_chunk_bits = 3;
161 unsigned long hdr_data_chunk_tsn = 0;
162 unsigned short hdr_data_chunk_sid = 0;
163 unsigned short hdr_data_chunk_ssn = 0;
164 unsigned long hdr_data_chunk_ppid = 0;
167 /*--- Local date -----------------------------------------------------------------*/
169 /* This is where we store the packet currently being built */
170 #define MAX_PACKET 64000
171 unsigned char packet_buf[MAX_PACKET];
172 unsigned long curr_offset = 0;
174 /* This buffer contains strings present before the packet offset 0 */
175 #define PACKET_PREAMBLE_MAX_LEN 2048
176 static unsigned char packet_preamble[PACKET_PREAMBLE_MAX_LEN+1];
177 static int packet_preamble_len = 0;
179 /* Number of packets read and written */
180 unsigned long num_packets_read = 0;
181 unsigned long num_packets_written = 0;
183 /* Time code of packet, derived from packet_preamble */
184 static unsigned long ts_sec = 0;
185 static unsigned long ts_usec = 0;
186 static char *ts_fmt = NULL;
189 char *input_filename;
190 FILE *input_file = NULL;
192 char *output_filename;
193 FILE *output_file = NULL;
195 /* Offset base to parse */
196 unsigned long offset_base = 16;
200 /* ----- State machine -----------------------------------------------------------*/
202 /* Current state of parser */
204 INIT, /* Waiting for start of new packet */
205 START_OF_LINE, /* Starting from beginning of line */
206 READ_OFFSET, /* Just read the offset */
207 READ_BYTE, /* Just read a byte */
208 READ_TEXT, /* Just read text - ignore until EOL */
210 parser_state_t state = INIT;
212 const char *state_str[] = {"Init",
219 const char *token_str[] = {"",
227 /* ----- Skeleton Packet Headers --------------------------------------------------*/
230 unsigned char src_addr[6];
231 unsigned char dest_addr[6];
232 unsigned short l3pid;
235 hdr_ethernet_t HDR_ETHERNET = {
236 {0x01, 0x01, 0x01, 0x01, 0x01, 0x01},
237 {0x02, 0x02, 0x02, 0x02, 0x02, 0x02},
241 unsigned char ver_hdrlen;
243 unsigned short packet_length;
244 unsigned short identification;
246 unsigned char fragment;
248 unsigned char protocol;
249 unsigned short hdr_checksum;
250 unsigned long src_addr;
251 unsigned long dest_addr;
254 hdr_ip_t HDR_IP = {0x45, 0, 0, 0x3412, 0, 0, 0xff, 0, 0, 0x01010101, 0x02020202};
257 unsigned short source_port;
258 unsigned short dest_port;
259 unsigned short length;
260 unsigned short checksum;
263 hdr_udp_t HDR_UDP = {0, 0, 0, 0};
266 unsigned short src_port;
267 unsigned short dest_port;
269 unsigned long checksum;
272 hdr_sctp_t HDR_SCTP = {0, 0, 0, 0};
277 unsigned short length;
284 hdr_data_chunk_t HDR_DATA_CHUNK = {0, 0, 0, 0, 0, 0, 0};
288 /*----------------------------------------------------------------------
289 * Stuff for writing a PCap file
291 #define PCAP_MAGIC 0xa1b2c3d4
293 /* "libpcap" file header (minus magic number). */
295 unsigned long magic; /* magic */
296 unsigned short version_major; /* major version number */
297 unsigned short version_minor; /* minor version number */
298 unsigned long thiszone; /* GMT to local correction */
299 unsigned long sigfigs; /* accuracy of timestamps */
300 unsigned long snaplen; /* max length of captured packets, in octets */
301 unsigned long network; /* data link type */
304 /* "libpcap" record header. */
306 unsigned long ts_sec; /* timestamp seconds */
307 unsigned long ts_usec; /* timestamp microseconds */
308 unsigned long incl_len; /* number of octets of packet saved in file */
309 unsigned long orig_len; /* actual length of packet */
312 /* Link-layer type; see net/bpf.h for details */
313 unsigned long pcap_link_type = 1; /* Default is DLT-EN10MB */
315 /*----------------------------------------------------------------------
316 * Parse a single hex number
317 * Will abort the program if it can't parse the number
318 * Pass in TRUE if this is an offset, FALSE if not
321 parse_num (char *str, int offset)
326 num = strtoul(str, &c, offset ? offset_base : 16);
328 fprintf(stderr, "FATAL ERROR: Bad hex number? [%s]\n", str);
334 /*----------------------------------------------------------------------
335 * Write this byte into current packet
338 write_byte (char *str)
342 num = parse_num(str, FALSE);
343 packet_buf[curr_offset] = num;
347 /*----------------------------------------------------------------------
348 * Remove bytes from the current packet
351 unwrite_bytes (unsigned long nbytes)
353 curr_offset -= nbytes;
356 /*----------------------------------------------------------------------
357 * Compute one's complement checksum (from RFC1071)
359 static unsigned short
360 in_checksum (void *buf, unsigned long count)
362 unsigned long sum = 0;
363 unsigned short *addr = buf;
366 /* This is the inner loop */
367 sum += ntohs(* (unsigned short *) addr++);
371 /* Add left-over byte, if any */
373 sum += * (unsigned char *) addr;
375 /* Fold 32-bit sum to 16 bits */
377 sum = (sum & 0xffff) + (sum >> 16);
382 /* The CRC32C code is taken from draft-ietf-tsvwg-sctpcsum-01.txt.
383 * That code is copyrighted by D. Otis and has been modified.
386 #define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF])
387 static unsigned long crc_c[256] =
389 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
390 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
391 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
392 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
393 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
394 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
395 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
396 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
397 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
398 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
399 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
400 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
401 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
402 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
403 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
404 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
405 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
406 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
407 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
408 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
409 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
410 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
411 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
412 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
413 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
414 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
415 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
416 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
417 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
418 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
419 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
420 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
421 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
422 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
423 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
424 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
425 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
426 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
427 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
428 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
429 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
430 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
431 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
432 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
433 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
434 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
435 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
436 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
437 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
438 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
439 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
440 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
441 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
442 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
443 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
444 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
445 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
446 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
447 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
448 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
449 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
450 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
451 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
452 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L,
456 crc32c(const unsigned char* buf, unsigned int len, unsigned long crc32_init)
462 for (i = 0; i < len; i++)
463 CRC32C(crc32, buf[i]);
468 number_of_padding_bytes (unsigned long length)
470 unsigned long remainder;
472 remainder = length % 4;
477 return 4 - remainder;
480 /*----------------------------------------------------------------------
481 * Write current packet out
484 write_current_packet (void)
489 int eth_trailer_length = 0;
490 int i, padding_length;
491 struct pcaprec_hdr ph;
493 if (curr_offset > 0) {
494 /* Write the packet */
496 /* Compute packet length */
497 length = curr_offset;
498 if (hdr_data_chunk) { length += sizeof(HDR_DATA_CHUNK) + number_of_padding_bytes(curr_offset); }
499 if (hdr_sctp) { length += sizeof(HDR_SCTP); }
500 if (hdr_udp) { length += sizeof(HDR_UDP); udp_length = length; }
501 if (hdr_ip) { length += sizeof(HDR_IP); ip_length = length; }
503 length += sizeof(HDR_ETHERNET);
506 eth_trailer_length = 60 - length;
511 /* Write PCap header */
513 ph.ts_usec = ts_usec;
514 ph.incl_len = length;
515 ph.orig_len = length;
516 fwrite(&ph, sizeof(ph), 1, output_file);
518 /* Write Ethernet header */
520 HDR_ETHERNET.l3pid = htons(hdr_ethernet_proto);
521 fwrite(&HDR_ETHERNET, sizeof(HDR_ETHERNET), 1, output_file);
524 /* Write IP header */
526 HDR_IP.packet_length = htons(ip_length);
527 HDR_IP.protocol = hdr_ip_proto;
528 HDR_IP.hdr_checksum = 0;
529 HDR_IP.hdr_checksum = in_checksum(&HDR_IP, sizeof(HDR_IP));
530 fwrite(&HDR_IP, sizeof(HDR_IP), 1, output_file);
533 /* Write UDP header */
535 HDR_UDP.source_port = htons(hdr_udp_src);
536 HDR_UDP.dest_port = htons(hdr_udp_dest);
537 HDR_UDP.length = htons(udp_length);
539 fwrite(&HDR_UDP, sizeof(HDR_UDP), 1, output_file);
542 /* Compute DATA chunk header and append padding */
543 if (hdr_data_chunk) {
544 HDR_DATA_CHUNK.type = hdr_data_chunk_type;
545 HDR_DATA_CHUNK.bits = hdr_data_chunk_bits;
546 HDR_DATA_CHUNK.length = htons(curr_offset + sizeof(HDR_DATA_CHUNK));
547 HDR_DATA_CHUNK.tsn = htonl(hdr_data_chunk_tsn);
548 HDR_DATA_CHUNK.sid = htons(hdr_data_chunk_sid);
549 HDR_DATA_CHUNK.ssn = htons(hdr_data_chunk_ssn);
550 HDR_DATA_CHUNK.ppid = htonl(hdr_data_chunk_ppid);
552 padding_length = number_of_padding_bytes(curr_offset);
553 for (i=0; i<padding_length; i++)
557 /* Write SCTP header */
559 HDR_SCTP.src_port = htons(hdr_sctp_src);
560 HDR_SCTP.dest_port = htons(hdr_sctp_dest);
561 HDR_SCTP.tag = htonl(hdr_sctp_tag);
562 HDR_SCTP.checksum = htonl(0);
563 HDR_SCTP.checksum = crc32c((unsigned char *)&HDR_SCTP, sizeof(HDR_SCTP), ~0L);
565 HDR_SCTP.checksum = crc32c((unsigned char *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
566 HDR_SCTP.checksum = htonl(crc32c(packet_buf, curr_offset, HDR_SCTP.checksum));
568 fwrite(&HDR_SCTP, sizeof(HDR_SCTP), 1, output_file);
571 /* Write DATA chunk header */
572 if (hdr_data_chunk) {
573 fwrite(&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), 1, output_file);
576 fwrite(packet_buf, curr_offset, 1, output_file);
578 /* Write Ethernet trailer */
579 if (hdr_ethernet && eth_trailer_length > 0) {
580 memset(tempbuf, 0, eth_trailer_length);
581 fwrite(tempbuf, eth_trailer_length, 1, output_file);
585 fprintf(stderr, "Wrote packet of %lu bytes\n", curr_offset);
586 num_packets_written ++;
591 /*----------------------------------------------------------------------
592 * Write the PCap file header
595 write_file_header (void)
599 fh.magic = PCAP_MAGIC;
600 fh.version_major = 2;
601 fh.version_minor = 4;
605 fh.network = pcap_link_type;
607 fwrite(&fh, sizeof(fh), 1, output_file);
610 /*----------------------------------------------------------------------
611 * Append a token to the packet preamble.
614 append_to_preamble(char *str)
618 if (packet_preamble_len != 0) {
619 if (packet_preamble_len == PACKET_PREAMBLE_MAX_LEN)
620 return; /* no room to add more preamble */
621 /* Add a blank separator between the previous token and this token. */
622 packet_preamble[packet_preamble_len++] = ' ';
624 toklen = strlen(str);
626 if (packet_preamble_len + toklen > PACKET_PREAMBLE_MAX_LEN)
627 return; /* no room to add the token to the preamble */
628 strcpy(&packet_preamble[packet_preamble_len], str);
629 packet_preamble_len += toklen;
633 /*----------------------------------------------------------------------
634 * Parse the preamble to get the timecode.
637 parse_preamble (void)
646 * If no "-t" flag was specified, don't attempt to parse a packet
647 * preamble to extract a time stamp.
656 * Null-terminate the preamble.
658 packet_preamble[packet_preamble_len] = '\0';
660 /* Ensure preamble has more than two chars before atempting to parse.
661 * This should cover line breaks etc that get counted.
663 if ( strlen(packet_preamble) > 2 ) {
665 * Initialize to the Epoch, just in case not all fields
666 * of the date and time are specified.
670 timecode.tm_hour = 0;
671 timecode.tm_mday = 1;
673 timecode.tm_year = 70;
674 timecode.tm_wday = 0;
675 timecode.tm_yday = 0;
676 timecode.tm_isdst = -1;
678 /* Get Time leaving subseconds */
679 subsecs = strptime( packet_preamble, ts_fmt, &timecode );
680 if (subsecs != NULL) {
681 /* Get the long time from the tm structure */
682 ts_sec = (unsigned long)mktime( &timecode );
684 ts_sec = -1; /* we failed to parse it */
686 /* This will ensure incorrectly parsed dates get set to zero */
687 if ( -1L == (long)ts_sec )
694 /* Parse subseconds */
695 ts_usec = strtol(subsecs, &p, 10);
701 * Convert that number to a number
702 * of microseconds; if it's N digits
703 * long, it's in units of 10^(-N) seconds,
704 * so, to convert it to units of
705 * 10^-6 seconds, we multiply by
708 subseclen = p - subsecs;
711 * *More* than 6 digits; 6-N is
712 * negative, so we divide by
715 for (i = subseclen - 6; i != 0; i--)
717 } else if (subseclen < 6) {
718 for (i = 6 - subseclen; i != 0; i--)
726 /*printf("Format(%s), time(%u), subsecs(%u)\n\n", ts_fmt, ts_sec, ts_usec);*/
729 packet_preamble_len = 0;
732 /*----------------------------------------------------------------------
736 start_new_packet (void)
739 fprintf(stderr, "Start new packet\n");
741 /* Write out the current packet, if required */
742 write_current_packet();
746 /* Ensure we parse the packet preamble as it may contain the time */
750 /*----------------------------------------------------------------------
751 * Process a directive
754 process_directive (char *str)
756 fprintf(stderr, "\n--- Directive [%s] currently unsupported ---\n", str+10);
760 /*----------------------------------------------------------------------
761 * Parse a single token (called from the scanner)
764 parse_token (token_t token, char *str)
769 * This is implemented as a simple state machine of five states.
770 * State transitions are caused by tokens being received from the
771 * scanner. The code should be self_documenting.
775 /* Sanitize - remove all '\r' */
777 if (str!=NULL) { while ((c = strchr(str, '\r')) != NULL) *c=' '; }
779 fprintf(stderr, "(%s, %s \"%s\") -> (",
780 state_str[state], token_str[token], str ? str : "");
785 /* ----- Waiting for new packet -------------------------------------------*/
789 append_to_preamble(str);
792 process_directive(str);
795 num = parse_num(str, TRUE);
797 /* New packet starts here */
807 /* ----- Processing packet, start of new line -----------------------------*/
811 append_to_preamble(str);
814 process_directive(str);
817 num = parse_num(str, TRUE);
819 /* New packet starts here */
822 } else if (num != curr_offset) {
824 * The offset we read isn't the one we expected.
825 * This may only mean that we mistakenly interpreted
826 * some text as byte values (e.g., if the text dump
827 * of packet data included a number with spaces around
828 * it). If the offset is less than what we expected,
829 * assume that's the problem, and throw away the putative
832 if (num < curr_offset) {
833 unwrite_bytes(curr_offset - num);
836 /* Bad offset; switch to INIT state */
838 fprintf(stderr, "Inconsistent offset. Expecting %0lX, got %0lX. Ignoring rest of packet\n",
840 write_current_packet();
851 /* ----- Processing packet, read offset -----------------------------------*/
855 /* Record the byte */
865 state = START_OF_LINE;
872 /* ----- Processing packet, read byte -------------------------------------*/
876 /* Record the byte */
885 state = START_OF_LINE;
892 /* ----- Processing packet, read text -------------------------------------*/
896 state = START_OF_LINE;
904 fprintf(stderr, "FATAL ERROR: Bad state (%d)", state);
909 fprintf(stderr, ", %s)\n", state_str[state]);
913 /*----------------------------------------------------------------------
914 * Print helpstring and exit
917 help (char *progname)
921 "Usage: %s [-d] [-q] [-o h|o] [-l typenum] [-e l3pid] [-i proto] \n"
922 " [-u srcp,destp] [-s srcp,destp,tag] [-S srcp,destp,tag] [-t timefmt] <input-filename> <output-filename>\n"
924 "where <input-filename> specifies input filename (use - for standard input)\n"
925 " <output-filename> specifies output filename (use - for standard output)\n"
927 "[options] are one or more of the following \n"
929 " -w filename : Write capfile to <filename>. Default is standard output\n"
930 " -h : Display this help message \n"
931 " -d : Generate detailed debug of parser states \n"
932 " -o hex|oct : Parse offsets as (h)ex or (o)ctal. Default is hex\n"
933 " -l typenum : Specify link-layer type number. Default is 1 (Ethernet). \n"
934 " See net/bpf.h for list of numbers.\n"
935 " -q : Generate no output at all (automatically turns off -d)\n"
936 " -e l3pid : Prepend dummy Ethernet II header with specified L3PID (in HEX)\n"
937 " Example: -e 0x800\n"
938 " -i proto : Prepend dummy IP header with specified IP protocol (in DECIMAL). \n"
939 " Automatically prepends Ethernet header as well. Example: -i 46\n"
940 " -u srcp,destp : Prepend dummy UDP header with specified dest and source ports (in DECIMAL).\n"
941 " Automatically prepends Ethernet and IP headers as well\n"
942 " Example: -u 30,40\n"
943 " -s srcp,dstp,tag: Prepend dummy SCTP header with specified dest/source ports and\n"
944 " verification tag (in DECIMAL).\n"
945 " Automatically prepends Ethernet and IP headers as well\n"
946 " Example: -s 30,40,34\n"
947 " -S srcp,dstp,tag: Same as -s srcp,dstp,tag but also prepends a DATA chunk header.\n"
948 " Example: -S 30,40,34\n"
949 " -t timefmt : Treats the text before the packet as a date/time code; the\n"
950 " specified argument is a format string of the sort supported\n"
952 " Example: The time \"10:15:14.5476\" has the format code\n"
953 " \"%%H:%%M:%%S.\"\n"
954 " NOTE: The subsecond component delimiter must be specified\n"
955 " (.) but no pattern is required; the remaining number\n"
956 " is assumed to be fractions of a second.\n"
963 /*----------------------------------------------------------------------
967 parse_options (int argc, char *argv[])
972 /* Scan CLI parameters */
973 while ((c = getopt(argc, argv, "dqr:w:e:i:l:o:u:s:S:t:")) != -1) {
975 case '?': help(argv[0]); break;
976 case 'h': help(argv[0]); break;
977 case 'd': if (!quiet) debug++; break;
978 case 'q': quiet = TRUE; debug = FALSE; break;
979 case 'l': pcap_link_type = atoi(optarg); break;
981 if (optarg[0]!='h' && optarg[0] != 'o') {
982 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
985 offset_base = (optarg[0]=='o') ? 8 : 16;
989 if (sscanf(optarg, "%lx", &hdr_ethernet_proto) < 1) {
990 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
997 if (sscanf(optarg, "%ld", &hdr_ip_proto) < 1) {
998 fprintf(stderr, "Bad argument for '-i': %s\n", optarg);
1001 hdr_ethernet = TRUE;
1002 hdr_ethernet_proto = 0x800;
1006 hdr_data_chunk = TRUE;
1009 hdr_sctp_src = strtol(optarg, &p, 10);
1010 if (p == optarg || (*p != ',' && *p != '\0')) {
1011 fprintf(stderr, "Bad src port for '-%c'\n", c);
1015 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1020 hdr_sctp_dest = strtol(optarg, &p, 10);
1021 if (p == optarg || (*p != ',' && *p != '\0')) {
1022 fprintf(stderr, "Bad dest port for '-s'\n");
1025 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1030 hdr_sctp_tag = strtol(optarg, &p, 10);
1031 if (p == optarg || *p != '\0') {
1032 fprintf(stderr, "Bad tag for '-%c'\n", c);
1038 hdr_ethernet = TRUE;
1039 hdr_ethernet_proto = 0x800;
1048 hdr_udp_src = strtol(optarg, &p, 10);
1049 if (p == optarg || (*p != ',' && *p != '\0')) {
1050 fprintf(stderr, "Bad src port for '-u'\n");
1054 fprintf(stderr, "No dest port specified for '-u'\n");
1059 hdr_udp_dest = strtol(optarg, &p, 10);
1060 if (p == optarg || *p != '\0') {
1061 fprintf(stderr, "Bad dest port for '-u'\n");
1066 hdr_ethernet = TRUE;
1067 hdr_ethernet_proto = 0x800;
1075 if (optind >= argc || argc-optind < 2) {
1076 fprintf(stderr, "Must specify input and output filename\n");
1080 if (strcmp(argv[optind], "-")) {
1081 input_filename = strdup(argv[optind]);
1082 input_file = fopen(input_filename, "rb");
1084 fprintf(stderr, "Cannot open file [%s] for reading: %s\n",
1085 input_filename, strerror(errno));
1089 input_filename = "Standard input";
1093 if (strcmp(argv[optind+1], "-")) {
1094 output_filename = strdup(argv[optind+1]);
1095 output_file = fopen(output_filename, "wb");
1097 fprintf(stderr, "Cannot open file [%s] for writing: %s\n",
1098 output_filename, strerror(errno));
1102 output_filename = "Standard output";
1103 output_file = stdout;
1106 /* Some validation */
1107 if (pcap_link_type != 1 && hdr_ethernet) {
1108 fprintf(stderr, "Dummy headers (-e, -i, -u, -s, -S) cannot be specified with link type override (-l)\n");
1112 /* Set up our variables */
1115 input_filename = "Standard input";
1118 output_file = stdout;
1119 output_filename = "Standard output";
1122 /* Display summary of our state */
1124 fprintf(stderr, "Input from: %s\n", input_filename);
1125 fprintf(stderr, "Output to: %s\n", output_filename);
1127 if (hdr_ethernet) fprintf(stderr, "Generate dummy Ethernet header: Protocol: 0x%0lX\n",
1128 hdr_ethernet_proto);
1129 if (hdr_ip) fprintf(stderr, "Generate dummy IP header: Protocol: %ld\n",
1131 if (hdr_udp) fprintf(stderr, "Generate dummy UDP header: Source port: %ld. Dest port: %ld\n",
1132 hdr_udp_src, hdr_udp_dest);
1133 if (hdr_sctp) fprintf(stderr, "Generate dummy SCTP header: Source port: %ld. Dest port: %ld. Tag: %ld\n",
1134 hdr_sctp_src, hdr_sctp_dest, hdr_sctp_tag);
1135 if (hdr_data_chunk) fprintf(stderr, "Generate dummy DATA chunk header: TSN: %ld. SID: %d. SSN: %d. PPID: %ld\n",
1136 hdr_data_chunk_tsn, hdr_data_chunk_sid, hdr_data_chunk_ssn, hdr_data_chunk_ppid);
1140 int main(int argc, char *argv[])
1142 parse_options(argc, argv);
1144 assert(input_file != NULL);
1145 assert(output_file != NULL);
1147 write_file_header();
1152 write_current_packet();
1154 fprintf(stderr, "\n-------------------------\n");
1156 fprintf(stderr, "Read %ld potential packets, wrote %ld packets\n",
1157 num_packets_read, num_packets_written);