int packet_read(int fd, char **src_buf, size_t *src_len,
char *buffer, unsigned size, int options)
{
int len, ret;
char linelen[4];
ret = get_packet_data(fd, src_buf, src_len, linelen, 4, options);
if (ret < 0)
return ret;
len = packet_length(linelen);
if (len < 0)
die("protocol error: bad line length character: %.4s", linelen);
if (!len) {
packet_trace("0000", 4, 0);
return 0;
}
len -= 4;
if (len >= size)
die("protocol error: bad line length %d", len);
ret = get_packet_data(fd, src_buf, src_len, buffer, len, options);
if (ret < 0)
return ret;
if ((options & PACKET_READ_CHOMP_NEWLINE) &&
len && buffer[len-1] == '\n')
len--;
buffer[len] = 0;
packet_trace(buffer, len, 0);
return len;
}
/* Save request data for later use in response */
void ipmi_set_data(packet_info *pinfo, guint idx, guint32 value)
{
ipmi_packet_data_t * data = get_packet_data(pinfo);
/* check bounds */
if (data->curr_level >= MAX_NEST_LEVEL || idx >= NSAVED_DATA ) {
return;
}
/* save data */
data->curr_frame->cmd_data[data->curr_level]->saved_data[idx] = value;
}
/* Get saved request data */
gboolean ipmi_get_data(packet_info *pinfo, guint idx, guint32 * value)
{
ipmi_packet_data_t * data = get_packet_data(pinfo);
/* check bounds */
if (data->curr_level >= MAX_NEST_LEVEL || idx >= NSAVED_DATA ) {
return FALSE;
}
/* get data */
*value = data->curr_frame->cmd_data[data->curr_level]->saved_data[idx];
return TRUE;
}
//***************************************************************************
// this will be needed for normal Ethernet Rx waiting
//***************************************************************************
int CPacketList::wait_for_packet(u8 *rbfr, uint tmo_secs)
{
int result = 0 ;
// DWORD dresult ;
if (!rx_event_active) {
return -(int) ERROR_INVALID_HANDLE;
}
// report_func("wait for eth RX packet [%u]\n", ) ;
// DWORD rc = WaitForSingleObject(this_port->hdlRxEvent, tmo_secs * 1000) ;
int done = 0 ;
while (!done) {
// if (user_abort_signalled(this_port))
// return -(int) ERROR_CANCELLED ;
// if (dbg_flags & DBG_RX_DEBUG)
// syslog("Wait Rx Event\n") ;
// DWORD rc = WaitForSingleObject(hdlRxEvent, 1000) ;
DWORD rc = WaitForSingleObject(hdlRxEvent, tmo_secs * 1000) ;
// if (dbg_flags & DBG_RX_DEBUG)
// syslog("Got Rx Event, rc=%u\n", (unsigned) rc) ;
switch (rc) {
case WAIT_OBJECT_0:
//*****************************************************************************
// this function has an interesting quirk...
// Even though we've received an RxEvent, indicating that the event
// had been signalled, and therefore there should be data on the queue,
// get_packet_data() sometimes returns -ERROR_NOT_SAME_DEVICE,
// indicating there is NO data on the queue.
// Further, it appears to happen after some timeout period...
// How could this happen?
//*****************************************************************************
// syslog("read comm resp: data ready, hdl=%u\n", (uint) hdlRxEvent) ;
result = get_packet_data(rbfr) ; // pop list into rx_bfr
// if (result < 0) {
// DWORD dresult = GetLastError() ;
// syslog("w4so: GLE=%u, R=%d, tsec=%u\n", (uint) dresult, result, tmo_secs) ;
// }
done = 1 ;
break;
case WAIT_TIMEOUT:
// if packet timed out or errored out,
// take a pass at processing the partial packet,
// just in case we got everything except ETX
result = -ERROR_SEM_TIMEOUT;
done = 1 ;
break;
// if (tmo_secs == 0) {
// result = -ERROR_SEM_TIMEOUT;
// done = 1 ;
// break;
// }
// // if timeout seconds have *not* counted down to 0, keep waiting
// if (--tmo_secs == 0) {
// result = -ERROR_SEM_TIMEOUT;
// done = 1 ;
// break;
// }
// break;
// case WAIT_ABANDONED: // ummm... I don't know...
default:
if (rc == WAIT_ABANDONED)
syslog("read comm resp: what does WAIT_ABANDONED mean??\n") ;
else
syslog("read comm resp: WaitForSingleObject [%u]: %d, [%u] %s\n",
(uint) hdlRxEvent, rc, (uint) GetLastError(), get_system_message()) ;
result = -ERROR_INVALID_DATA;
done = 1 ;
break;
}
} // while !done
return result;
}
/* Get completion code for currently parsed message */
guint8 ipmi_get_ccode(packet_info * pinfo)
{
ipmi_packet_data_t * data = get_packet_data(pinfo);
return data->curr_ccode;
}
/* Get currently parsed message header */
const ipmi_header_t * ipmi_get_hdr(packet_info * pinfo)
{
ipmi_packet_data_t * data = get_packet_data(pinfo);
return data->curr_hdr;
}
static int
dissect_ipmi_cmd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
gint hf_parent_item, gint ett_tree, const ipmi_context_t * ctx)
{
ipmi_packet_data_t * data;
ipmi_netfn_t * cmd_list;
ipmi_cmd_t * cmd;
proto_item * ti;
proto_tree * cmd_tree = NULL, * tmp_tree;
guint8 prev_level, cc_val;
guint offset, siglen, is_resp;
const char * cc_str, * netfn_str;
/* get packet data */
data = get_packet_data(pinfo);
if (!data) {
return 0;
}
/* get prefix length */
siglen = ipmi_getsiglen(ctx->hdr.netfn);
/* get response flag */
is_resp = ctx->hdr.netfn & 1;
/* check message length */
if (tvb_captured_length(tvb) < ctx->hdr_len + siglen + is_resp
+ !(ctx->flags & IPMI_D_NO_CKS)) {
/* don bother with anything */
return call_data_dissector(tvb, pinfo, tree);
}
/* save nest level */
prev_level = data->curr_level;
/* assign next nest level */
data->curr_level = data->next_level;
/* increment next nest level */
data->next_level++;
/* check for the first invocation */
if (!data->curr_level) {
/* get current frame data */
data->curr_frame = get_frame_data(data, pinfo->num);
data->curr_frame_num = pinfo->num;
/* copy frame timestamp */
memcpy(&data->curr_frame->ts, &pinfo->abs_ts, sizeof(nstime_t));
/* cache channel and direction */
data->curr_channel = ctx->hdr.channel;
data->curr_dir = ctx->hdr.dir;
/* remove requests which are too old */
remove_old_requests(data, &pinfo->abs_ts);
}
if (data->curr_level < MAX_NEST_LEVEL) {
if (ctx->hdr.netfn & 1) {
/* perform request/response matching */
match_request_response(data, &ctx->hdr, ctx->flags);
} else {
/* add request to the list for later matching */
add_request(data, &ctx->hdr);
}
}
/* get command list by network function code */
cmd_list = ipmi_getnetfn(ctx->hdr.netfn,
tvb_get_ptr(tvb, ctx->hdr_len + is_resp, siglen));
/* get command descriptor */
cmd = ipmi_getcmd(cmd_list, ctx->hdr.cmd);
/* check if response */
if (is_resp) {
/* get completion code */
cc_val = tvb_get_guint8(tvb, ctx->hdr_len);
/* get completion code desc */
cc_str = ipmi_get_completion_code(cc_val, cmd);
} else {
cc_val = 0;
cc_str = NULL;
}
/* check if not inside a message */
if (!data->curr_level) {
/* add packet info */
add_command_info(pinfo, cmd, is_resp, cc_val, cc_str,
ctx->flags & IPMI_D_BROADCAST ? TRUE : FALSE);
}
if (tree) {
/* add parent node */
if (!data->curr_level) {
ti = proto_tree_add_item(tree, hf_parent_item, tvb, 0, -1, ENC_NA);
cmd_tree = proto_item_add_subtree(ti, ett_tree);
} else {
char str[ITEM_LABEL_LENGTH];
if (is_resp) {
g_snprintf(str, ITEM_LABEL_LENGTH, "Rsp, %s, %s",
cmd->desc, cc_str);
} else {
g_snprintf(str, ITEM_LABEL_LENGTH, "Req, %s", cmd->desc);
}
if (proto_registrar_get_ftype(hf_parent_item) == FT_STRING) {
ti = proto_tree_add_string(tree, hf_parent_item, tvb, 0, -1, str);
cmd_tree = proto_item_add_subtree(ti, ett_tree);
}
else
cmd_tree = proto_tree_add_subtree(tree, tvb, 0, -1, ett_tree, NULL, str);
}
if (data->curr_level < MAX_NEST_LEVEL) {
/* check if response */
if (ctx->hdr.netfn & 1) {
/* get current command data */
ipmi_cmd_data_t * rs_data =
data->curr_frame->cmd_data[data->curr_level];
if (rs_data->matched_frame_num) {
nstime_t ns;
/* add "Request to:" field */
ti = proto_tree_add_uint(cmd_tree, hf_ipmi_response_to,
tvb, 0, 0, rs_data->matched_frame_num);
/* mark field as a generated one */
PROTO_ITEM_SET_GENERATED(ti);
/* calculate delta time */
nstime_delta(&ns, &pinfo->abs_ts,
&get_frame_data(data,
rs_data->matched_frame_num)->ts);
/* add "Response time" field */
ti = proto_tree_add_time(cmd_tree, hf_ipmi_response_time,
tvb, 0, 0, &ns);
/* mark field as a generated one */
PROTO_ITEM_SET_GENERATED(ti);
}
} else {
/* get current command data */
ipmi_cmd_data_t * rq_data =
data->curr_frame->cmd_data[data->curr_level];
if (rq_data->matched_frame_num) {
/* add "Response in:" field */
ti = proto_tree_add_uint(cmd_tree, hf_ipmi_response_in,
tvb, 0, 0, rq_data->matched_frame_num);
/* mark field as a generated one */
PROTO_ITEM_SET_GENERATED(ti);
}
}
}
/* set starting offset */
offset = 0;
/* check if message is broadcast */
if (ctx->flags & IPMI_D_BROADCAST) {
/* skip first byte */
offset++;
}
/* check if session handle is specified */
if (ctx->flags & IPMI_D_SESSION_HANDLE) {
/* add session handle field */
proto_tree_add_item(cmd_tree, hf_ipmi_session_handle,
tvb, offset++, 1, ENC_LITTLE_ENDIAN);
}
/* check if responder address is specified */
if (ctx->flags & IPMI_D_TRG_SA) {
/* add response address field */
proto_tree_add_item(cmd_tree, hf_ipmi_header_trg, tvb,
offset++, 1, ENC_LITTLE_ENDIAN);
}
/* get NetFn string */
netfn_str = ipmi_getnetfnname(ctx->hdr.netfn, cmd_list);
/* Network function + target LUN */
tmp_tree = proto_tree_add_subtree_format(cmd_tree, tvb, offset, 1,
ett_header_byte_1, NULL, "Target LUN: 0x%02x, NetFN: %s %s (0x%02x)",
ctx->hdr.rs_lun, netfn_str,
is_resp ? "Response" : "Request", ctx->hdr.netfn);
/* add Net Fn */
proto_tree_add_uint_format(tmp_tree, hf_ipmi_header_netfn, tvb,
offset, 1, ctx->hdr.netfn << 2,
"NetFn: %s %s (0x%02x)", netfn_str,
is_resp ? "Response" : "Request", ctx->hdr.netfn);
proto_tree_add_item(tmp_tree, hf_ipmi_header_trg_lun, tvb,
offset++, 1, ENC_LITTLE_ENDIAN);
/* check if cks1 is specified */
if (!(ctx->flags & IPMI_D_NO_CKS)) {
guint8 cks = tvb_get_guint8(tvb, offset);
/* Header checksum */
if (ctx->cks1) {
guint8 correct = cks - ctx->cks1;
proto_tree_add_uint_format_value(cmd_tree, hf_ipmi_header_crc,
tvb, offset++, 1, cks,
"0x%02x (incorrect, expected 0x%02x)", cks, correct);
} else {
proto_tree_add_uint_format_value(cmd_tree, hf_ipmi_header_crc,
tvb, offset++, 1, cks,
"0x%02x (correct)", cks);
}
}
/* check if request address is specified */
if (!(ctx->flags & IPMI_D_NO_RQ_SA)) {
/* add request address field */
proto_tree_add_item(cmd_tree, hf_ipmi_header_src, tvb,
offset++, 1, ENC_LITTLE_ENDIAN);
}
/* check if request sequence is specified */
if (!(ctx->flags & IPMI_D_NO_SEQ)) {
/* Sequence number + source LUN */
tmp_tree = proto_tree_add_subtree_format(cmd_tree, tvb, offset, 1,
ett_header_byte_4, NULL, "%s: 0x%02x, SeqNo: 0x%02x",
(ctx->flags & IPMI_D_TMODE) ? "Bridged" : "Source LUN",
ctx->hdr.rq_lun, ctx->hdr.rq_seq);
if (ctx->flags & IPMI_D_TMODE) {
proto_tree_add_item(tmp_tree, hf_ipmi_header_bridged,
tvb, offset, 1, ENC_LITTLE_ENDIAN);
} else {
proto_tree_add_item(tmp_tree, hf_ipmi_header_src_lun,
tvb, offset, 1, ENC_LITTLE_ENDIAN);
}
/* print seq no */
proto_tree_add_item(tmp_tree, hf_ipmi_header_sequence, tvb,
offset++, 1, ENC_LITTLE_ENDIAN);
}
/* command code */
proto_tree_add_uint_format_value(cmd_tree, hf_ipmi_header_command,
tvb, offset++, 1, ctx->hdr.cmd, "%s (0x%02x)",
cmd->desc, ctx->hdr.cmd);
if (is_resp) {
/* completion code */
proto_tree_add_uint_format_value(cmd_tree,
hf_ipmi_header_completion, tvb, offset++, 1,
cc_val, "%s (0x%02x)", cc_str, cc_val);
}
if (siglen) {
/* command prefix (if present) */
ti = proto_tree_add_item(cmd_tree, hf_ipmi_header_sig, tvb,
offset, siglen, ENC_NA);
proto_item_append_text(ti, " (%s)", netfn_str);
}
}
if (tree || (cmd->flags & CMD_CALLRQ)) {
/* calculate message data length */
guint data_len = tvb_captured_length(tvb)
- ctx->hdr_len
- siglen
- (is_resp ? 1 : 0)
- !(ctx->flags & IPMI_D_NO_CKS);
/* create data subset */
tvbuff_t * data_tvb = tvb_new_subset_length(tvb,
ctx->hdr_len + siglen + (is_resp ? 1 : 0), data_len);
/* Select sub-handler */
ipmi_cmd_handler_t hnd = is_resp ? cmd->parse_resp : cmd->parse_req;
if (hnd && tvb_captured_length(data_tvb)) {
/* create data field */
tmp_tree = proto_tree_add_subtree(cmd_tree, data_tvb, 0, -1, ett_data, NULL, "Data");
/* save current command */
data->curr_hdr = &ctx->hdr;
/* save current completion code */
data->curr_ccode = cc_val;
/* call command parser */
hnd(data_tvb, pinfo, tmp_tree);
}
}
/* check if cks2 is specified */
if (tree && !(ctx->flags & IPMI_D_NO_CKS)) {
guint8 cks;
/* get cks2 offset */
offset = tvb_captured_length(tvb) - 1;
/* get cks2 */
cks = tvb_get_guint8(tvb, offset);
/* Header checksum */
if (ctx->cks2) {
guint8 correct = cks - ctx->cks2;
proto_tree_add_uint_format_value(cmd_tree, hf_ipmi_data_crc,
tvb, offset, 1, cks,
"0x%02x (incorrect, expected 0x%02x)", cks, correct);
} else {
proto_tree_add_uint_format_value(cmd_tree, hf_ipmi_data_crc,
tvb, offset, 1, cks,
"0x%02x (correct)", cks);
}
}
/* decrement next nest level */
data->next_level = data->curr_level;
/* restore previous nest level */
data->curr_level = prev_level;
return tvb_captured_length(tvb);
}
/**
* Avalia se o pacote deve ser redirecionado ou salvo.
* @param packet Ponteiro para o pacote.
* @param usage_type Tipo do cliente que está chamando a função.
* @return 0 em falha e !0 em sucesso.
*/
int where_to_send(char *packet, usage_type_t usage_type)
{
struct iphdr *ip;
struct udphdr *udp;
struct data_info *data;
struct in_addr tmp;
int ret;
ip = (struct iphdr *)packet;
udp = get_udp_packet(packet);
/* Verifica a sanidade do pacote, se estiver com erro, dropa */
if (!sanity_check(ip)) {
printf("Packet received with error, dropping.\n");
cstats.lost_pkts++;
return 0;
}
switch (usage_type) {
case ROUTER_USAGE:
/* Router esta fazendo forward do pacote, subtrai ttl */
ip->ttl -= IPTTLDEC;
ip->check = 0;
ip->check = in_cksum((unsigned short *)ip, ip->tot_len);
cstats.fw_pkts += ip->tot_len;
printf("Forwarding packet:\n");
printf("\tPacket ttl %d\n", ip->ttl);
printf("\tPacket size: %d bytes\n", ip->tot_len);
tmp.s_addr = ip->saddr;
printf("\tFrom: %s\n", inet_ntoa(tmp));
tmp.s_addr = ip->daddr;
printf("\tTo: %s\n", inet_ntoa(tmp));
if ((ret = send_data(packet)) < 0) {
printf("* Error forwarding packet. *\n");
cstats.lost_pkts++;
}
break;
default:
data = get_packet_data(packet);
if (data->fragmented) {
save_packet_fragment(data);
if (is_packet_complete(data)) {
/* Se o pacote for um fragmento e completar o dado, salva e
* remove do buffer */
printf("Fragmented Data complete.\n");
struct data_info *dinfo = get_defragmented_data(data->id);
ret = save_data(dinfo);
cstats.recv_pkts += ip->tot_len;
printf("Data received:\n");
printf("\tPacket: %lld bytes\n", dinfo->tot_len);
tmp.s_addr = ip->saddr;
printf("\tFrom: %s\n", inet_ntoa(tmp));
printf("\tFile Name: %s\n", ((char *)dinfo + sizeof(struct data_info)));
printf("\tFile size: %ld bytes\n", dinfo->data_size);
} else {
/* Se o pacote for um fragmento, apenas adiciona ao buffer e
* adiciona seus dados à estatística. */
cstats.recv_pkts += ip->tot_len;
printf(".");
ret = 0;
}
break;
}
/* Se o pacote não for um fragmento, salva e adiciona seus dados à
* estatística. */
ret = save_data(data);
cstats.recv_pkts += ip->tot_len;
printf("Data received:\n");
printf("\tPacket: %d bytes\n", ip->tot_len);
tmp.s_addr = ip->saddr;
printf("\tFrom: %s\n", inet_ntoa(tmp));
printf("\tFile Name: %s\n", ((char *)data + sizeof(struct data_info)));
printf("\tFile size: %ld bytes\n", data->data_size);
break;
}
return ret;
}
