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      1 /*
      2  * Copyright 2009 Bert Vermeulen <bert (at) biot.com>
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that: (1) source code distributions
      6  * retain the above copyright notice and this paragraph in its entirety, (2)
      7  * distributions including binary code include the above copyright notice and
      8  * this paragraph in its entirety in the documentation or other materials
      9  * provided with the distribution, and (3) all advertising materials mentioning
     10  * features or use of this software display the following acknowledgement:
     11  * ``This product includes software developed by Paolo Abeni.''
     12  * The name of author may not be used to endorse or promote products derived
     13  * from this software without specific prior written permission.
     14  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
     15  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
     16  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     17  *
     18  * Support for USB packets
     19  *
     20  */
     21 
     22 #define NETDISSECT_REWORKED
     23 #ifdef HAVE_CONFIG_H
     24 #include "config.h"
     25 #endif
     26 
     27 #include <tcpdump-stdinc.h>
     28 
     29 #include "interface.h"
     30 
     31 
     32 #if defined(HAVE_PCAP_USB_H) && defined(DLT_USB_LINUX)
     33 #include <pcap/usb.h>
     34 
     35 static const char tstr[] = "[|usb]";
     36 
     37 /* returns direction: 1=inbound 2=outbound -1=invalid */
     38 static int
     39 get_direction(int transfer_type, int event_type)
     40 {
     41 	int direction;
     42 
     43 	direction = -1;
     44 	switch(transfer_type){
     45 	case URB_BULK:
     46 	case URB_CONTROL:
     47 	case URB_ISOCHRONOUS:
     48 		switch(event_type)
     49 		{
     50 		case URB_SUBMIT:
     51 			direction = 2;
     52 			break;
     53 		case URB_COMPLETE:
     54 		case URB_ERROR:
     55 			direction = 1;
     56 			break;
     57 		default:
     58 			direction = -1;
     59 		}
     60 		break;
     61 	case URB_INTERRUPT:
     62 		switch(event_type)
     63 		{
     64 		case URB_SUBMIT:
     65 			direction = 1;
     66 			break;
     67 		case URB_COMPLETE:
     68 		case URB_ERROR:
     69 			direction = 2;
     70 			break;
     71 		default:
     72 			direction = -1;
     73 		}
     74 		break;
     75 	 default:
     76 		direction = -1;
     77 	}
     78 
     79 	return direction;
     80 }
     81 
     82 static void
     83 usb_header_print(netdissect_options *ndo, const pcap_usb_header *uh)
     84 {
     85 	int direction;
     86 
     87 	switch(uh->transfer_type)
     88 	{
     89 		case URB_ISOCHRONOUS:
     90 			ND_PRINT((ndo, "ISOCHRONOUS"));
     91 			break;
     92 		case URB_INTERRUPT:
     93 			ND_PRINT((ndo, "INTERRUPT"));
     94 			break;
     95 		case URB_CONTROL:
     96 			ND_PRINT((ndo, "CONTROL"));
     97 			break;
     98 		case URB_BULK:
     99 			ND_PRINT((ndo, "BULK"));
    100 			break;
    101 		default:
    102 			ND_PRINT((ndo, " ?"));
    103 	}
    104 
    105 	switch(uh->event_type)
    106 	{
    107 		case URB_SUBMIT:
    108 			ND_PRINT((ndo, " SUBMIT"));
    109 			break;
    110 		case URB_COMPLETE:
    111 			ND_PRINT((ndo, " COMPLETE"));
    112 			break;
    113 		case URB_ERROR:
    114 			ND_PRINT((ndo, " ERROR"));
    115 			break;
    116 		default:
    117 			ND_PRINT((ndo, " ?"));
    118 	}
    119 
    120 	direction = get_direction(uh->transfer_type, uh->event_type);
    121 	if(direction == 1)
    122 		ND_PRINT((ndo, " from"));
    123 	else if(direction == 2)
    124 		ND_PRINT((ndo, " to"));
    125 	ND_PRINT((ndo, " %d:%d:%d", uh->bus_id, uh->device_address, uh->endpoint_number & 0x7f));
    126 }
    127 
    128 /*
    129  * This is the top level routine of the printer for captures with a
    130  * 48-byte header.
    131  *
    132  * 'p' points to the header of the packet, 'h->ts' is the timestamp,
    133  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
    134  * is the number of bytes actually captured.
    135  */
    136 u_int
    137 usb_linux_48_byte_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
    138                         register const u_char *p)
    139 {
    140 	if (h->caplen < sizeof(pcap_usb_header)) {
    141 		ND_PRINT((ndo, "%s", tstr));
    142 		return(sizeof(pcap_usb_header));
    143 	}
    144 
    145 	usb_header_print(ndo, (const pcap_usb_header *) p);
    146 
    147 	return(sizeof(pcap_usb_header));
    148 }
    149 
    150 #ifdef DLT_USB_LINUX_MMAPPED
    151 /*
    152  * This is the top level routine of the printer for captures with a
    153  * 64-byte header.
    154  *
    155  * 'p' points to the header of the packet, 'h->ts' is the timestamp,
    156  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
    157  * is the number of bytes actually captured.
    158  */
    159 u_int
    160 usb_linux_64_byte_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
    161                         register const u_char *p)
    162 {
    163 	if (h->caplen < sizeof(pcap_usb_header_mmapped)) {
    164 		ND_PRINT((ndo, "%s", tstr));
    165 		return(sizeof(pcap_usb_header_mmapped));
    166 	}
    167 
    168 	usb_header_print(ndo, (const pcap_usb_header *) p);
    169 
    170 	return(sizeof(pcap_usb_header_mmapped));
    171 }
    172 #endif /* DLT_USB_LINUX_MMAPPED */
    173 
    174 #endif /* defined(HAVE_PCAP_USB_H) && defined(DLT_USB_LINUX) */
    175 
    176