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osmo-bsc
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Dump something that can be read by wireshark 

We need to append the Linux LAPD header for wireshark. This means
that we currently can not support B Channels or such. Maybe we will
need to add another LAPD header.
This commit is contained in:
Harald Welte 2009-01-03 03:04:07 +00:00
parent 62a923d46a
commit 4e0d137a2c
1 changed files with 22 additions and 30 deletions
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52
src/misdn.c
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@ -31,6 +31,7 @@
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <mISDNif.h>
//#define AF_COMPATIBILITY_FUNC
@ -73,19 +74,20 @@ struct pcaprec_hdr {
u_int32_t orig_len;
} __attribute__((packed));
struct pseudo_isdn_header {
int32_t uton;
u_int8_t channel;
struct fake_linux_lapd_header {
u_int16_t pkttype;
u_int16_t hatype;
u_int16_t halen;
u_int64_t addr;
int16_t protocol;
} __attribute__((packed));
struct fake_lapd_frame {
u_int8_t ea1 : 1;
u_int8_t cr : 1;
u_int8_t sapi : 6;
u_int8_t ea2 : 1;
u_int8_t tei : 7;
u_int8_t control_foo; /* fake UM's ... */
} __attribute__((packed));
static_assert((int)&((struct fake_linux_lapd_header*)NULL)->hatype == 2, hatype_offset);
static_assert((int)&((struct fake_linux_lapd_header*)NULL)->halen == 4, halen_offset);
static_assert((int)&((struct fake_linux_lapd_header*)NULL)->addr == 6, addr_offset);
static_assert((int)&((struct fake_linux_lapd_header*)NULL)->protocol == 14, proto_offset);
static_assert(sizeof(struct fake_linux_lapd_header) == 16, lapd_header_size);
static int pcap_fd = -1;
@ -116,40 +118,30 @@ static void write_pcap_packet(int direction, struct sockaddr_mISDN* addr,
time_t cur_time;
struct tm *tm;
struct pseudo_isdn_header isdn = {
/* user to network.. we are the network.. gboolean is a init */
.uton = 0,
.channel = addr->channel,
};
struct fake_lapd_frame header = {
.ea1 = 0,
.cr = PCAP_OUTPUT ? 1 : 0,
.sapi = addr->sapi & 0x3F,
.ea2 = 1,
.tei = addr->tei & 0x7F,
.control_foo = 0x13 /* UI with P set */,
struct fake_linux_lapd_header header = {
.pkttype = 4,
.hatype = 0,
.halen = 0,
.addr = 0x1,
.protocol = ntohs(48),
};
struct pcaprec_hdr payload_header = {
.ts_sec = 0,
.ts_usec = 0,
.incl_len = msg->len + sizeof(struct fake_lapd_frame)
+ sizeof(struct pseudo_isdn_header)
.incl_len = msg->len + sizeof(struct fake_linux_lapd_header)
- MISDN_HEADER_LEN,
.orig_len = msg->len + sizeof(struct fake_lapd_frame)
+ sizeof(struct pseudo_isdn_header)
.orig_len = msg->len + sizeof(struct fake_linux_lapd_header)
- MISDN_HEADER_LEN,
};
cur_time = time(NULL);
tm = localtime(&cur_time);
payload_header.ts_sec = mktime(tm);
ret = write(pcap_fd, &payload_header, sizeof(payload_header));
ret = write(pcap_fd, &isdn, sizeof(isdn));
ret = write(pcap_fd, &header, sizeof(header));
ret = write(pcap_fd, msg->data + MISDN_HEADER_LEN,
msg->len - MISDN_HEADER_LEN);