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Fix cross-platform issue about the file-format in which

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usbdump stores data. Until this patch it was not possible
to exchange traces between 32-bit, 64-bit, big- and
little endian platforms. The problem is the dynamic nature
of the BPF timestamp in the header. All other fields are
fixed size and little endian.

MFC after:	5 days
This commit is contained in:
Hans Petter Selasky 2012-03-16 16:29:21 +00:00
parent 3b22825af7
commit 3c27df12e0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=233037
1 changed files with 97 additions and 8 deletions
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105
usr.sbin/usbdump/usbdump.c
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@ -92,6 +92,26 @@ struct usbcap_filehdr {
uint8_t reserved[26];
} __packed;
#define HEADER_ALIGN(x,a) (((x) + (a) - 1) & ~((a) - 1))
struct header_32 {
uint32_t ts_sec;
uint32_t ts_usec;
uint32_t caplen;
uint32_t datalen;
uint16_t hdrlen;
uint16_t dummy;
} __packed;
struct header_64 {
uint64_t ts_sec;
uint64_t ts_usec;
uint32_t caplen;
uint32_t datalen;
uint16_t hdrlen;
uint16_t dummy;
} __packed;
static int doexit = 0;
static int pkt_captured = 0;
static int verbose = 0;
@ -413,7 +433,7 @@ hexdump(const uint8_t *region, uint32_t len)
}
static void
print_apacket(const struct bpf_hdr *hdr, const uint8_t *ptr, int ptr_len)
print_apacket(const struct header_32 *hdr, const uint8_t *ptr, int ptr_len)
{
struct tm *tm;
struct usbpf_pkthdr up_temp;
@ -448,8 +468,8 @@ print_apacket(const struct bpf_hdr *hdr, const uint8_t *ptr, int ptr_len)
up->up_packet_count = le32toh(up->up_packet_count);
up->up_endpoint = le32toh(up->up_endpoint);
tv.tv_sec = hdr->bh_tstamp.tv_sec;
tv.tv_usec = hdr->bh_tstamp.tv_usec;
tv.tv_sec = hdr->ts_sec;
tv.tv_usec = hdr->ts_usec;
tm = localtime(&tv.tv_sec);
len = strftime(buf, sizeof(buf), "%H:%M:%S", tm);
@ -516,17 +536,86 @@ print_apacket(const struct bpf_hdr *hdr, const uint8_t *ptr, int ptr_len)
static void
print_packets(uint8_t *data, const int datalen)
{
const struct bpf_hdr *hdr;
struct header_32 temp;
uint8_t *ptr;
uint8_t *next;
for (ptr = data; ptr < (data + datalen); ptr = next) {
hdr = (const struct bpf_hdr *)ptr;
next = ptr + BPF_WORDALIGN(hdr->bh_hdrlen + hdr->bh_caplen);
/* automatically figure out endian and size of header */
if (r_arg != NULL) {
const struct header_32 *hdr32;
const struct header_64 *hdr64;
hdr32 = (const struct header_32 *)ptr;
hdr64 = (const struct header_64 *)ptr;
temp.hdrlen = le16toh(hdr32->hdrlen);
temp.dummy = le16toh(hdr32->dummy);
if ((temp.hdrlen != 18 && temp.hdrlen != 20) || (temp.dummy != 0)) {
temp.hdrlen = be16toh(hdr32->hdrlen);
temp.dummy = be16toh(hdr32->dummy);
if ((temp.hdrlen != 18 && temp.hdrlen != 20) || (temp.dummy != 0)) {
temp.hdrlen = le16toh(hdr64->hdrlen);
temp.dummy = le16toh(hdr64->dummy);
if ((temp.hdrlen != 28 && temp.hdrlen != 32) || (temp.dummy != 0)) {
temp.hdrlen = be16toh(hdr64->hdrlen);
temp.dummy = be16toh(hdr64->dummy);
if ((temp.hdrlen != 28 && temp.hdrlen != 32) || (temp.dummy != 0)) {
err(EXIT_FAILURE, "Invalid header detected");
next = NULL;
} else {
temp.ts_sec = be64toh(hdr64->ts_sec);
temp.ts_usec = be64toh(hdr64->ts_usec);
temp.caplen = be32toh(hdr64->caplen);
temp.datalen = be32toh(hdr64->datalen);
next = ptr + HEADER_ALIGN(temp.hdrlen + temp.caplen, 8);
}
} else {
temp.ts_sec = le64toh(hdr64->ts_sec);
temp.ts_usec = le64toh(hdr64->ts_usec);
temp.caplen = le32toh(hdr64->caplen);
temp.datalen = le32toh(hdr64->datalen);
next = ptr + HEADER_ALIGN(temp.hdrlen + temp.caplen, 8);
}
} else {
temp.ts_sec = be32toh(hdr32->ts_sec);
temp.ts_usec = be32toh(hdr32->ts_usec);
temp.caplen = be32toh(hdr32->caplen);
temp.datalen = be32toh(hdr32->datalen);
next = ptr + HEADER_ALIGN(temp.hdrlen + temp.caplen, 4);
}
} else {
temp.ts_sec = le32toh(hdr32->ts_sec);
temp.ts_usec = le32toh(hdr32->ts_usec);
temp.caplen = le32toh(hdr32->caplen);
temp.datalen = le32toh(hdr32->datalen);
next = ptr + HEADER_ALIGN(temp.hdrlen + temp.caplen, 4);
}
} else {
const struct bpf_hdr *hdr;
hdr = (const struct bpf_hdr *)ptr;
temp.ts_sec = hdr->bh_tstamp.tv_sec;
temp.ts_usec = hdr->bh_tstamp.tv_usec;
temp.caplen = hdr->bh_caplen;
temp.datalen = hdr->bh_datalen;
temp.hdrlen = hdr->bh_hdrlen;
next = ptr + BPF_WORDALIGN(temp.hdrlen + temp.caplen);
}
if (next <= ptr)
err(EXIT_FAILURE, "Invalid header length");
if (w_arg == NULL) {
print_apacket(hdr, ptr +
hdr->bh_hdrlen, hdr->bh_caplen);
print_apacket(&temp, ptr +
temp.hdrlen, temp.caplen);
}
pkt_captured++;
}