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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 /* \summary: USB printer */
     23 
     24 #ifdef HAVE_CONFIG_H
     25 #include "config.h"
     26 #endif
     27 
     28 #include <netdissect-stdinc.h>
     29 
     30 #include "netdissect.h"
     31 
     32 
     33 #if defined(HAVE_PCAP_USB_H) && defined(DLT_USB_LINUX)
     34 #include <pcap/usb.h>
     35 
     36 static const char tstr[] = "[|usb]";
     37 
     38 /* returns direction: 1=inbound 2=outbound -1=invalid */
     39 static int
     40 get_direction(int transfer_type, int event_type)
     41 {
     42 	int direction;
     43 
     44 	direction = -1;
     45 	switch(transfer_type){
     46 	case URB_BULK:
     47 	case URB_CONTROL:
     48 	case URB_ISOCHRONOUS:
     49 		switch(event_type)
     50 		{
     51 		case URB_SUBMIT:
     52 			direction = 2;
     53 			break;
     54 		case URB_COMPLETE:
     55 		case URB_ERROR:
     56 			direction = 1;
     57 			break;
     58 		default:
     59 			direction = -1;
     60 		}
     61 		break;
     62 	case URB_INTERRUPT:
     63 		switch(event_type)
     64 		{
     65 		case URB_SUBMIT:
     66 			direction = 1;
     67 			break;
     68 		case URB_COMPLETE:
     69 		case URB_ERROR:
     70 			direction = 2;
     71 			break;
     72 		default:
     73 			direction = -1;
     74 		}
     75 		break;
     76 	 default:
     77 		direction = -1;
     78 	}
     79 
     80 	return direction;
     81 }
     82 
     83 static void
     84 usb_header_print(netdissect_options *ndo, const pcap_usb_header *uh)
     85 {
     86 	int direction;
     87 
     88 	switch(uh->transfer_type)
     89 	{
     90 		case URB_ISOCHRONOUS:
     91 			ND_PRINT((ndo, "ISOCHRONOUS"));
     92 			break;
     93 		case URB_INTERRUPT:
     94 			ND_PRINT((ndo, "INTERRUPT"));
     95 			break;
     96 		case URB_CONTROL:
     97 			ND_PRINT((ndo, "CONTROL"));
     98 			break;
     99 		case URB_BULK:
    100 			ND_PRINT((ndo, "BULK"));
    101 			break;
    102 		default:
    103 			ND_PRINT((ndo, " ?"));
    104 	}
    105 
    106 	switch(uh->event_type)
    107 	{
    108 		case URB_SUBMIT:
    109 			ND_PRINT((ndo, " SUBMIT"));
    110 			break;
    111 		case URB_COMPLETE:
    112 			ND_PRINT((ndo, " COMPLETE"));
    113 			break;
    114 		case URB_ERROR:
    115 			ND_PRINT((ndo, " ERROR"));
    116 			break;
    117 		default:
    118 			ND_PRINT((ndo, " ?"));
    119 	}
    120 
    121 	direction = get_direction(uh->transfer_type, uh->event_type);
    122 	if(direction == 1)
    123 		ND_PRINT((ndo, " from"));
    124 	else if(direction == 2)
    125 		ND_PRINT((ndo, " to"));
    126 	ND_PRINT((ndo, " %d:%d:%d", uh->bus_id, uh->device_address, uh->endpoint_number & 0x7f));
    127 }
    128 
    129 /*
    130  * This is the top level routine of the printer for captures with a
    131  * 48-byte header.
    132  *
    133  * 'p' points to the header of the packet, 'h->ts' is the timestamp,
    134  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
    135  * is the number of bytes actually captured.
    136  */
    137 u_int
    138 usb_linux_48_byte_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
    139                         register const u_char *p)
    140 {
    141 	if (h->caplen < sizeof(pcap_usb_header)) {
    142 		ND_PRINT((ndo, "%s", tstr));
    143 		return(sizeof(pcap_usb_header));
    144 	}
    145 
    146 	usb_header_print(ndo, (const pcap_usb_header *) p);
    147 
    148 	return(sizeof(pcap_usb_header));
    149 }
    150 
    151 #ifdef DLT_USB_LINUX_MMAPPED
    152 /*
    153  * This is the top level routine of the printer for captures with a
    154  * 64-byte header.
    155  *
    156  * 'p' points to the header of the packet, 'h->ts' is the timestamp,
    157  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
    158  * is the number of bytes actually captured.
    159  */
    160 u_int
    161 usb_linux_64_byte_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
    162                         register const u_char *p)
    163 {
    164 	if (h->caplen < sizeof(pcap_usb_header_mmapped)) {
    165 		ND_PRINT((ndo, "%s", tstr));
    166 		return(sizeof(pcap_usb_header_mmapped));
    167 	}
    168 
    169 	usb_header_print(ndo, (const pcap_usb_header *) p);
    170 
    171 	return(sizeof(pcap_usb_header_mmapped));
    172 }
    173 #endif /* DLT_USB_LINUX_MMAPPED */
    174 
    175 #endif /* defined(HAVE_PCAP_USB_H) && defined(DLT_USB_LINUX) */
    176 
    177