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 1.14 2002/01/30 10:19:43 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]);
465 number_of_padding_bytes (unsigned long length)
467 unsigned long remainder;
469 remainder = length % 4;
474 return 4 - remainder;
477 /*----------------------------------------------------------------------
478 * Write current packet out
481 write_current_packet (void)
486 int eth_trailer_length = 0;
487 int i, padding_length;
488 struct pcaprec_hdr ph;
490 if (curr_offset > 0) {
491 /* Write the packet */
493 /* Compute packet length */
494 length = curr_offset;
495 if (hdr_data_chunk) { length += sizeof(HDR_DATA_CHUNK) + number_of_padding_bytes(curr_offset); }
496 if (hdr_sctp) { length += sizeof(HDR_SCTP); }
497 if (hdr_udp) { length += sizeof(HDR_UDP); udp_length = length; }
498 if (hdr_ip) { length += sizeof(HDR_IP); ip_length = length; }
500 length += sizeof(HDR_ETHERNET);
503 eth_trailer_length = 60 - length;
508 /* Write PCap header */
510 ph.ts_usec = ts_usec;
511 ph.incl_len = length;
512 ph.orig_len = length;
513 fwrite(&ph, sizeof(ph), 1, output_file);
515 /* Write Ethernet header */
517 HDR_ETHERNET.l3pid = htons(hdr_ethernet_proto);
518 fwrite(&HDR_ETHERNET, sizeof(HDR_ETHERNET), 1, output_file);
521 /* Write IP header */
523 HDR_IP.packet_length = htons(ip_length);
524 HDR_IP.protocol = hdr_ip_proto;
525 HDR_IP.hdr_checksum = 0;
526 HDR_IP.hdr_checksum = in_checksum(&HDR_IP, sizeof(HDR_IP));
527 fwrite(&HDR_IP, sizeof(HDR_IP), 1, output_file);
530 /* Write UDP header */
532 HDR_UDP.source_port = htons(hdr_udp_src);
533 HDR_UDP.dest_port = htons(hdr_udp_dest);
534 HDR_UDP.length = htons(udp_length);
536 fwrite(&HDR_UDP, sizeof(HDR_UDP), 1, output_file);
539 /* Compute DATA chunk header and append padding */
540 if (hdr_data_chunk) {
541 HDR_DATA_CHUNK.type = hdr_data_chunk_type;
542 HDR_DATA_CHUNK.bits = hdr_data_chunk_bits;
543 HDR_DATA_CHUNK.length = htons(curr_offset + sizeof(HDR_DATA_CHUNK));
544 HDR_DATA_CHUNK.tsn = htonl(hdr_data_chunk_tsn);
545 HDR_DATA_CHUNK.sid = htons(hdr_data_chunk_sid);
546 HDR_DATA_CHUNK.ssn = htons(hdr_data_chunk_ssn);
547 HDR_DATA_CHUNK.ppid = htonl(hdr_data_chunk_ppid);
549 padding_length = number_of_padding_bytes(curr_offset);
550 for (i=0; i<padding_length; i++)
554 /* Write SCTP header */
556 HDR_SCTP.src_port = htons(hdr_sctp_src);
557 HDR_SCTP.dest_port = htons(hdr_sctp_dest);
558 HDR_SCTP.tag = htonl(hdr_sctp_tag);
559 HDR_SCTP.checksum = htonl(0);
560 HDR_SCTP.checksum = crc32c((unsigned char *)&HDR_SCTP, sizeof(HDR_SCTP), ~0L);
562 HDR_SCTP.checksum = crc32c((unsigned char *)&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), HDR_SCTP.checksum);
563 HDR_SCTP.checksum = htonl(crc32c(packet_buf, curr_offset, HDR_SCTP.checksum));
565 fwrite(&HDR_SCTP, sizeof(HDR_SCTP), 1, output_file);
568 /* Write DATA chunk header */
569 if (hdr_data_chunk) {
570 fwrite(&HDR_DATA_CHUNK, sizeof(HDR_DATA_CHUNK), 1, output_file);
573 fwrite(packet_buf, curr_offset, 1, output_file);
575 /* Write Ethernet trailer */
576 if (hdr_ethernet && eth_trailer_length > 0) {
577 memset(tempbuf, 0, eth_trailer_length);
578 fwrite(tempbuf, eth_trailer_length, 1, output_file);
582 fprintf(stderr, "Wrote packet of %lu bytes\n", curr_offset);
583 num_packets_written ++;
588 /*----------------------------------------------------------------------
589 * Write the PCap file header
592 write_file_header (void)
596 fh.magic = PCAP_MAGIC;
597 fh.version_major = 2;
598 fh.version_minor = 4;
602 fh.network = pcap_link_type;
604 fwrite(&fh, sizeof(fh), 1, output_file);
607 /*----------------------------------------------------------------------
608 * Append a token to the packet preamble.
611 append_to_preamble(char *str)
615 if (packet_preamble_len != 0) {
616 if (packet_preamble_len == PACKET_PREAMBLE_MAX_LEN)
617 return; /* no room to add more preamble */
618 /* Add a blank separator between the previous token and this token. */
619 packet_preamble[packet_preamble_len++] = ' ';
621 toklen = strlen(str);
623 if (packet_preamble_len + toklen > PACKET_PREAMBLE_MAX_LEN)
624 return; /* no room to add the token to the preamble */
625 strcpy(&packet_preamble[packet_preamble_len], str);
626 packet_preamble_len += toklen;
630 /*----------------------------------------------------------------------
631 * Parse the preamble to get the timecode.
634 parse_preamble (void)
643 * If no "-t" flag was specified, don't attempt to parse a packet
644 * preamble to extract a time stamp.
653 * Null-terminate the preamble.
655 packet_preamble[packet_preamble_len] = '\0';
657 /* Ensure preamble has more than two chars before atempting to parse.
658 * This should cover line breaks etc that get counted.
660 if ( strlen(packet_preamble) > 2 ) {
662 * Initialize to the Epoch, just in case not all fields
663 * of the date and time are specified.
667 timecode.tm_hour = 0;
668 timecode.tm_mday = 1;
670 timecode.tm_year = 70;
671 timecode.tm_wday = 0;
672 timecode.tm_yday = 0;
673 timecode.tm_isdst = -1;
675 /* Get Time leaving subseconds */
676 subsecs = strptime( packet_preamble, ts_fmt, &timecode );
677 if (subsecs != NULL) {
678 /* Get the long time from the tm structure */
679 ts_sec = (unsigned long)mktime( &timecode );
681 ts_sec = -1; /* we failed to parse it */
683 /* This will ensure incorrectly parsed dates get set to zero */
684 if ( -1L == (long)ts_sec )
691 /* Parse subseconds */
692 ts_usec = strtol(subsecs, &p, 10);
698 * Convert that number to a number
699 * of microseconds; if it's N digits
700 * long, it's in units of 10^(-N) seconds,
701 * so, to convert it to units of
702 * 10^-6 seconds, we multiply by
705 subseclen = p - subsecs;
708 * *More* than 6 digits; 6-N is
709 * negative, so we divide by
712 for (i = subseclen - 6; i != 0; i--)
714 } else if (subseclen < 6) {
715 for (i = 6 - subseclen; i != 0; i--)
723 /*printf("Format(%s), time(%u), subsecs(%u)\n\n", ts_fmt, ts_sec, ts_usec);*/
726 packet_preamble_len = 0;
729 /*----------------------------------------------------------------------
733 start_new_packet (void)
736 fprintf(stderr, "Start new packet\n");
738 /* Write out the current packet, if required */
739 write_current_packet();
743 /* Ensure we parse the packet preamble as it may contain the time */
747 /*----------------------------------------------------------------------
748 * Process a directive
751 process_directive (char *str)
753 fprintf(stderr, "\n--- Directive [%s] currently unsupported ---\n", str+10);
757 /*----------------------------------------------------------------------
758 * Parse a single token (called from the scanner)
761 parse_token (token_t token, char *str)
766 * This is implemented as a simple state machine of five states.
767 * State transitions are caused by tokens being received from the
768 * scanner. The code should be self_documenting.
772 /* Sanitize - remove all '\r' */
774 if (str!=NULL) { while ((c = strchr(str, '\r')) != NULL) *c=' '; }
776 fprintf(stderr, "(%s, %s \"%s\") -> (",
777 state_str[state], token_str[token], str ? str : "");
782 /* ----- Waiting for new packet -------------------------------------------*/
786 append_to_preamble(str);
789 process_directive(str);
792 num = parse_num(str, TRUE);
794 /* New packet starts here */
804 /* ----- Processing packet, start of new line -----------------------------*/
808 append_to_preamble(str);
811 process_directive(str);
814 num = parse_num(str, TRUE);
816 /* New packet starts here */
819 } else if (num != curr_offset) {
821 * The offset we read isn't the one we expected.
822 * This may only mean that we mistakenly interpreted
823 * some text as byte values (e.g., if the text dump
824 * of packet data included a number with spaces around
825 * it). If the offset is less than what we expected,
826 * assume that's the problem, and throw away the putative
829 if (num < curr_offset) {
830 unwrite_bytes(curr_offset - num);
833 /* Bad offset; switch to INIT state */
835 fprintf(stderr, "Inconsistent offset. Expecting %0lX, got %0lX. Ignoring rest of packet\n",
837 write_current_packet();
848 /* ----- Processing packet, read offset -----------------------------------*/
852 /* Record the byte */
862 state = START_OF_LINE;
869 /* ----- Processing packet, read byte -------------------------------------*/
873 /* Record the byte */
882 state = START_OF_LINE;
889 /* ----- Processing packet, read text -------------------------------------*/
893 state = START_OF_LINE;
901 fprintf(stderr, "FATAL ERROR: Bad state (%d)", state);
906 fprintf(stderr, ", %s)\n", state_str[state]);
910 /*----------------------------------------------------------------------
911 * Print helpstring and exit
914 help (char *progname)
918 "Usage: %s [-d] [-q] [-o h|o] [-l typenum] [-e l3pid] [-i proto] \n"
919 " [-u srcp,destp] [-s srcp,destp,tag] [-S srcp,destp,tag] [-t timefmt] <input-filename> <output-filename>\n"
921 "where <input-filename> specifies input filename (use - for standard input)\n"
922 " <output-filename> specifies output filename (use - for standard output)\n"
924 "[options] are one or more of the following \n"
926 " -w filename : Write capfile to <filename>. Default is standard output\n"
927 " -h : Display this help message \n"
928 " -d : Generate detailed debug of parser states \n"
929 " -o hex|oct : Parse offsets as (h)ex or (o)ctal. Default is hex\n"
930 " -l typenum : Specify link-layer type number. Default is 1 (Ethernet). \n"
931 " See net/bpf.h for list of numbers.\n"
932 " -q : Generate no output at all (automatically turns off -d)\n"
933 " -e l3pid : Prepend dummy Ethernet II header with specified L3PID (in HEX)\n"
934 " Example: -e 0x800\n"
935 " -i proto : Prepend dummy IP header with specified IP protocol (in DECIMAL). \n"
936 " Automatically prepends Ethernet header as well. Example: -i 46\n"
937 " -u srcp,destp : Prepend dummy UDP header with specified dest and source ports (in DECIMAL).\n"
938 " Automatically prepends Ethernet and IP headers as well\n"
939 " Example: -u 30,40\n"
940 " -s srcp,dstp,tag: Prepend dummy SCTP header with specified dest/source ports and\n"
941 " verification tag (in DECIMAL).\n"
942 " Automatically prepends Ethernet and IP headers as well\n"
943 " Example: -s 30,40,34\n"
944 " -S srcp,dstp,tag: Same as -s srcp,dstp,tag but also prepends a DATA chunk header.\n"
945 " Example: -S 30,40,34\n"
946 " -t timefmt : Treats the text before the packet as a date/time code; the\n"
947 " specified argument is a format string of the sort supported\n"
949 " Example: The time \"10:15:14.5476\" has the format code\n"
950 " \"%%H:%%M:%%S.\"\n"
951 " NOTE: The subsecond component delimiter must be specified\n"
952 " (.) but no pattern is required; the remaining number\n"
953 " is assumed to be fractions of a second.\n"
960 /*----------------------------------------------------------------------
964 parse_options (int argc, char *argv[])
969 /* Scan CLI parameters */
970 while ((c = getopt(argc, argv, "dqr:w:e:i:l:o:u:s:S:t:")) != -1) {
972 case '?': help(argv[0]); break;
973 case 'h': help(argv[0]); break;
974 case 'd': if (!quiet) debug++; break;
975 case 'q': quiet = TRUE; debug = FALSE; break;
976 case 'l': pcap_link_type = atoi(optarg); break;
978 if (optarg[0]!='h' && optarg[0] != 'o') {
979 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
982 offset_base = (optarg[0]=='o') ? 8 : 16;
986 if (sscanf(optarg, "%lx", &hdr_ethernet_proto) < 1) {
987 fprintf(stderr, "Bad argument for '-e': %s\n", optarg);
994 if (sscanf(optarg, "%ld", &hdr_ip_proto) < 1) {
995 fprintf(stderr, "Bad argument for '-i': %s\n", optarg);
999 hdr_ethernet_proto = 0x800;
1003 hdr_data_chunk = TRUE;
1006 hdr_sctp_src = strtol(optarg, &p, 10);
1007 if (p == optarg || (*p != ',' && *p != '\0')) {
1008 fprintf(stderr, "Bad src port for '-%c'\n", c);
1012 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1017 hdr_sctp_dest = strtol(optarg, &p, 10);
1018 if (p == optarg || (*p != ',' && *p != '\0')) {
1019 fprintf(stderr, "Bad dest port for '-s'\n");
1022 fprintf(stderr, "No dest port specified for '-%c'\n", c);
1027 hdr_sctp_tag = strtol(optarg, &p, 10);
1028 if (p == optarg || *p != '\0') {
1029 fprintf(stderr, "Bad tag for '-%c'\n", c);
1035 hdr_ethernet = TRUE;
1036 hdr_ethernet_proto = 0x800;
1045 hdr_udp_src = strtol(optarg, &p, 10);
1046 if (p == optarg || (*p != ',' && *p != '\0')) {
1047 fprintf(stderr, "Bad src port for '-u'\n");
1051 fprintf(stderr, "No dest port specified for '-u'\n");
1056 hdr_udp_dest = strtol(optarg, &p, 10);
1057 if (p == optarg || *p != '\0') {
1058 fprintf(stderr, "Bad dest port for '-u'\n");
1063 hdr_ethernet = TRUE;
1064 hdr_ethernet_proto = 0x800;
1072 if (optind >= argc || argc-optind < 2) {
1073 fprintf(stderr, "Must specify input and output filename\n");
1077 if (strcmp(argv[optind], "-")) {
1078 input_filename = strdup(argv[optind]);
1079 input_file = fopen(input_filename, "rb");
1081 fprintf(stderr, "Cannot open file [%s] for reading: %s\n",
1082 input_filename, strerror(errno));
1086 input_filename = "Standard input";
1090 if (strcmp(argv[optind+1], "-")) {
1091 output_filename = strdup(argv[optind+1]);
1092 output_file = fopen(output_filename, "wb");
1094 fprintf(stderr, "Cannot open file [%s] for writing: %s\n",
1095 output_filename, strerror(errno));
1099 output_filename = "Standard output";
1100 output_file = stdout;
1103 /* Some validation */
1104 if (pcap_link_type != 1 && hdr_ethernet) {
1105 fprintf(stderr, "Dummy headers (-e, -i, -u, -s, -S) cannot be specified with link type override (-l)\n");
1109 /* Set up our variables */
1112 input_filename = "Standard input";
1115 output_file = stdout;
1116 output_filename = "Standard output";
1119 /* Display summary of our state */
1121 fprintf(stderr, "Input from: %s\n", input_filename);
1122 fprintf(stderr, "Output to: %s\n", output_filename);
1124 if (hdr_ethernet) fprintf(stderr, "Generate dummy Ethernet header: Protocol: 0x%0lX\n",
1125 hdr_ethernet_proto);
1126 if (hdr_ip) fprintf(stderr, "Generate dummy IP header: Protocol: %ld\n",
1128 if (hdr_udp) fprintf(stderr, "Generate dummy UDP header: Source port: %ld. Dest port: %ld\n",
1129 hdr_udp_src, hdr_udp_dest);
1130 if (hdr_sctp) fprintf(stderr, "Generate dummy SCTP header: Source port: %ld. Dest port: %ld. Tag: %ld\n",
1131 hdr_sctp_src, hdr_sctp_dest, hdr_sctp_tag);
1132 if (hdr_data_chunk) fprintf(stderr, "Generate dummy DATA chunk header: TSN: %ld. SID: %d. SSN: %d. PPID: %ld\n",
1133 hdr_data_chunk_tsn, hdr_data_chunk_sid, hdr_data_chunk_ssn, hdr_data_chunk_ppid);
1137 int main(int argc, char *argv[])
1139 parse_options(argc, argv);
1141 assert(input_file != NULL);
1142 assert(output_file != NULL);
1144 write_file_header();
1149 write_current_packet();
1151 fprintf(stderr, "\n-------------------------\n");
1153 fprintf(stderr, "Read %ld potential packets, wrote %ld packets\n",
1154 num_packets_read, num_packets_written);