diff options
| author | Harald Welte <laforge@gnumonks.org> | 2009-01-03 03:28:10 +0000 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2009-01-03 03:28:10 +0000 |
| commit | 599639eaf924a3a6fa88583760b43eae2e7ce46c (patch) | |
| tree | 31aeeefaa425d0bfeb831e3ba199c5c2e3ae4ef5 /src | |
| parent | 4e0d137a2cd68f045a0eb379cd4dd67066f5fd69 (diff) | |
Readd the dummy lapd header... this gives valid TEI/SAPI information
Besides that the header is spoofed, we lose the information about
the channel (we will have to add our own encap type)
Diffstat (limited to 'src')
| -rw-r--r-- | src/misdn.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/src/misdn.c b/src/misdn.c index 6e45f2a49..920349ea9 100644 --- a/src/misdn.c +++ b/src/misdn.c @@ -82,6 +82,15 @@ struct fake_linux_lapd_header { int16_t protocol; } __attribute__((packed)); +struct lapd_header { + 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); @@ -122,17 +131,27 @@ static void write_pcap_packet(int direction, struct sockaddr_mISDN* addr, .pkttype = 4, .hatype = 0, .halen = 0, - .addr = 0x1, + .addr = direction == PCAP_OUTPUT ? 0x0 : 0x1, .protocol = ntohs(48), }; - + + struct lapd_header lapd_header = { + .ea1 = 0, + .cr = direction == PCAP_OUTPUT ? 1 : 0, + .sapi = addr->sapi & 0x3F, + .ea2 = 1, + .tei = addr->tei & 0x7F, + .control_foo = 0x13 /* UI with P set */, + }; struct pcaprec_hdr payload_header = { .ts_sec = 0, .ts_usec = 0, .incl_len = msg->len + sizeof(struct fake_linux_lapd_header) + + sizeof(struct lapd_header) - MISDN_HEADER_LEN, .orig_len = msg->len + sizeof(struct fake_linux_lapd_header) + + sizeof(struct lapd_header) - MISDN_HEADER_LEN, }; @@ -143,6 +162,7 @@ static void write_pcap_packet(int direction, struct sockaddr_mISDN* addr, ret = write(pcap_fd, &payload_header, sizeof(payload_header)); ret = write(pcap_fd, &header, sizeof(header)); + ret = write(pcap_fd, &lapd_header, sizeof(lapd_header)); ret = write(pcap_fd, msg->data + MISDN_HEADER_LEN, msg->len - MISDN_HEADER_LEN); } |