diff options
Diffstat (limited to 'epan/dissectors/packet-pptp.c')
| -rw-r--r-- | epan/dissectors/packet-pptp.c | 839 |
1 files changed, 839 insertions, 0 deletions
diff --git a/epan/dissectors/packet-pptp.c b/epan/dissectors/packet-pptp.c new file mode 100644 index 0000000000..f4db883388 --- /dev/null +++ b/epan/dissectors/packet-pptp.c @@ -0,0 +1,839 @@ +/* packet-pptp.c + * Routines for the Point-to-Point Tunnelling Protocol (PPTP) (RFC 2637) + * Brad Robel-Forrest <brad.robel-forrest@watchguard.com> + * + * $Id$ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * Copyright 1998 Gerald Combs + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <stdio.h> + +#include <glib.h> +#include <epan/packet.h> + +static int proto_pptp = -1; +static int hf_pptp_message_type = -1; + +static gint ett_pptp = -1; + +static dissector_handle_t data_handle; + +#define TCP_PORT_PPTP 1723 + +#define MAGIC_COOKIE 0x1A2B3C4D + +static const value_string msgtype_vals[] = { + { 1, "Control Message" }, + { 2, "Management Message" }, + { 0, NULL } +}; + +#define NUM_FRAME_TYPES 4 +#define frametype2str(t) \ + ((t < NUM_FRAME_TYPES) ? frametypestr[t] : "Unknown framing type") + +static const char *frametypestr[NUM_FRAME_TYPES] = { + "Unknown framing type", + "Asynchronous Framing supported", + "Synchronous Framing supported", + "Either Framing supported" +}; + +#define NUM_BEARER_TYPES 4 +#define bearertype2str(t) \ + ((t < NUM_BEARER_TYPES) ? bearertypestr[t] : "Unknown bearer type") + +static const char *bearertypestr[NUM_BEARER_TYPES] = { + "Unknown bearer type", + "Analog access supported", + "Digital access supported", + "Either access supported" +}; + +#define NUM_CNTRLRESULT_TYPES 6 +#define cntrlresulttype2str(t) \ + ((t < NUM_CNTRLRESULT_TYPES) ? cntrlresulttypestr[t] : "Unknown Start-Control-connection-Reply result code") + +static const char *cntrlresulttypestr[NUM_CNTRLRESULT_TYPES] = { + "Unknown Start-Control-connection-Reply result code", + "Successful channel establishment", + "General error", + "Command channel already exists", + "Requester not authorized", + "Protocol version not supported" +}; + +#define NUM_ERROR_TYPES 7 +#define errortype2str(t) \ + ((t < NUM_ERROR_TYPES) ? errortypestr[t] : "Unknown general error code") + +static const char *errortypestr[NUM_ERROR_TYPES] = { + "None", + "Not-Connected", + "Bad-Format", + "Bad-Value", + "No-Resource", + "Bad-Call ID", + "PAC-Error" +}; + +#define NUM_REASON_TYPES 4 +#define reasontype2str(t) \ + ((t < NUM_REASON_TYPES) ? reasontypestr[t] : "Unknown Stop-Control-Connection-Request reason code") + +static const char *reasontypestr[NUM_REASON_TYPES] = { + "Unknown Stop-Control-Connection-Request reason code", + "None", + "Stop-Protocol", + "Stop-Local-Shutdown" +}; + +#define NUM_STOPRESULT_TYPES 3 +#define stopresulttype2str(t) \ + ((t < NUM_STOPRESULT_TYPES) ? stopresulttypestr[t] : "Unknown Stop-Control-Connection-Reply result code") + +static const char *stopresulttypestr[NUM_STOPRESULT_TYPES] = { + "Unknown Stop-Control-Connection-Reply result code", + "OK", + "General error" +}; + +#define NUM_ECHORESULT_TYPES 3 +#define echoresulttype2str(t) \ + ((t < NUM_ECHORESULT_TYPES) ? echoresulttypestr[t] : "Unknown Echo-Reply result code") + +static const char *echoresulttypestr[NUM_ECHORESULT_TYPES] = { + "Unknown Echo-Reply result code", + "OK", + "General error" +}; + +#define NUM_OUTRESULT_TYPES 8 +#define outresulttype2str(t) \ + ((t < NUM_OUTRESULT_TYPES) ? outresulttypestr[t] : "Unknown Outgoing-Call-Reply result code") + +static const char *outresulttypestr[NUM_OUTRESULT_TYPES] = { + "Unknown Outgoing-Call-Reply result code", + "Connected", + "General Error", + "No Carrier", + "Busy", + "No Dial Tone", + "Time-out", + "Do Not Accept" +}; + +#define NUM_INRESULT_TYPES 4 +#define inresulttype2str(t) \ + ((t < NUM_INRESULT_TYPES) ? inresulttypestr[t] : "Unknown Incoming-Call-Reply result code") + +static const char *inresulttypestr[NUM_INRESULT_TYPES] = { + "Unknown Incoming-Call-Reply result code", + "Connect", + "General Error", + "Do Not Accept" +}; + +#define NUM_DISCRESULT_TYPES 5 +#define discresulttype2str(t) \ + ((t < NUM_DISCRESULT_TYPES) ? discresulttypestr[t] : "Unknown Call-Disconnect-Notify result code") + +static const char *discresulttypestr[NUM_DISCRESULT_TYPES] = { + "Unknown Call-Disconnect-Notify result code", + "Lost Carrier", + "General Error", + "Admin Shutdown", + "Request" +}; + +static void dissect_unknown(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_cntrl_req(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_cntrl_reply(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_stop_req(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_stop_reply(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_echo_req(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_echo_reply(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_out_req(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_out_reply(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_in_req(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_in_reply(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_in_connected(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_clear_req(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_disc_notify(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_error_notify(tvbuff_t *, int, packet_info *, proto_tree *); +static void dissect_set_link(tvbuff_t *, int, packet_info *, proto_tree *); + +#define NUM_CNTRL_TYPES 16 +#define cntrltype2str(t) \ + ((t < NUM_CNTRL_TYPES) ? strfuncs[t].str : "UNKNOWN-CONTROL-TYPE") + +static struct strfunc { + const char * str; + void (*func)(tvbuff_t *, int, packet_info *, proto_tree *); +} strfuncs[NUM_CNTRL_TYPES] = { + {"Unknown control type", dissect_unknown }, + {"Start-Control-Connection-Request", dissect_cntrl_req }, + {"Start-Control-Connection-Reply", dissect_cntrl_reply }, + {"Stop-Control-Connection-Request", dissect_stop_req }, + {"Stop-Control-Connection-Reply", dissect_stop_reply }, + {"Echo-Request", dissect_echo_req }, + {"Echo-Reply", dissect_echo_reply }, + {"Outgoing-Call-Request", dissect_out_req }, + {"Outgoing-Call-Reply", dissect_out_reply }, + {"Incoming-Call-Request", dissect_in_req }, + {"Incoming-Call-Reply", dissect_in_reply }, + {"Incoming-Call-Connected", dissect_in_connected }, + {"Call-Clear-Request", dissect_clear_req }, + {"Call-Disconnect-Notify", dissect_disc_notify }, + {"WAN-Error-Notify", dissect_error_notify }, + {"Set-Link-Info", dissect_set_link } +}; + +/* + * Length of host name and vendor name strings in control requests and + * replies. + */ +#define HOSTLEN 64 +#define VENDORLEN 64 + +/* + * Length of phone number(s) and subaddress in call requests. + */ +#define PHONELEN 64 +#define SUBADDRLEN 64 + +/* + * Length of statistics in a Call-Disconnect-Notify message. + */ +#define STATSLEN 128 + +static void +dissect_pptp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + int offset = 0; + guint16 len; + guint16 cntrl_type; + + if (check_col(pinfo->cinfo, COL_PROTOCOL)) + col_set_str(pinfo->cinfo, COL_PROTOCOL, "PPTP"); + if (check_col(pinfo->cinfo, COL_INFO)) + col_clear(pinfo->cinfo, COL_INFO); + + len = tvb_get_ntohs(tvb, offset); + cntrl_type = tvb_get_ntohs(tvb, offset + 8); + + if (check_col(pinfo->cinfo, COL_INFO)) + col_add_fstr(pinfo->cinfo, COL_INFO, "%s", cntrltype2str(cntrl_type)); + + if (tree) { + guint32 cookie; + proto_item * ti; + proto_tree * pptp_tree; + + ti = proto_tree_add_item(tree, proto_pptp, tvb, offset, len, FALSE); + pptp_tree = proto_item_add_subtree(ti, ett_pptp); + + proto_tree_add_text(pptp_tree, tvb, offset, 2, "Length: %u", len); + offset += 2; + + proto_tree_add_item(pptp_tree, hf_pptp_message_type, tvb, + offset, 2, FALSE); + offset += 2; + + cookie = tvb_get_ntohl(tvb, offset); + + if (cookie == MAGIC_COOKIE) + proto_tree_add_text(pptp_tree, tvb, offset, 4, + "Cookie: %#08x (correct)", cookie); + else + proto_tree_add_text(pptp_tree, tvb, offset, 4, + "Cookie: %#08x (incorrect)", cookie); + offset += 4; + + proto_tree_add_text(pptp_tree, tvb, offset, 2, + "Control type: %s (%u)", cntrltype2str(cntrl_type), cntrl_type); + offset += 2; + + proto_tree_add_text(pptp_tree, tvb, offset, 2, + "Reserved: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + if (cntrl_type < NUM_CNTRL_TYPES) + ( *(strfuncs[cntrl_type].func))(tvb, offset, pinfo, pptp_tree); + else + call_dissector(data_handle,tvb_new_subset(tvb, offset, -1, -1), pinfo, pptp_tree); + } +} + +static void +dissect_unknown(tvbuff_t *tvb, int offset, packet_info *pinfo, + proto_tree *tree) +{ + call_dissector(data_handle,tvb_new_subset(tvb, offset, -1, -1), pinfo, tree); +} + +static void +dissect_cntrl_req(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + guint8 major_ver; + guint8 minor_ver; + guint32 frame; + guint32 bearer; + guint8 host[HOSTLEN+1]; + guint8 vendor[VENDORLEN+1]; + + major_ver = tvb_get_guint8(tvb, offset); + minor_ver = tvb_get_guint8(tvb, offset + 1); + proto_tree_add_text(tree, tvb, offset, 2, + "Protocol version: %u.%u", major_ver, minor_ver); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Reserved: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + frame = tvb_get_ntohl(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 4, + "Framing capabilities: %s (%u)", frametype2str(frame), frame); + offset += 4; + + bearer = tvb_get_ntohl(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 4, + "Bearer capabilities: %s (%u)", bearertype2str(bearer), bearer); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 2, + "Maximum channels: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Firmware revision: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + tvb_memcpy(tvb, host, offset, HOSTLEN); + host[HOSTLEN] = '\0'; + proto_tree_add_text(tree, tvb, offset, HOSTLEN, + "Hostname: %s", host); + offset += HOSTLEN; + + tvb_memcpy(tvb, vendor, offset, VENDORLEN); + vendor[VENDORLEN] = '\0'; + proto_tree_add_text(tree, tvb, offset, VENDORLEN, + "Vendor: %s", vendor); +} + +static void +dissect_cntrl_reply(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + guint8 major_ver; + guint8 minor_ver; + guint8 result; + guint8 error; + guint32 frame; + guint32 bearer; + guint8 host[HOSTLEN+1]; + guint8 vendor[VENDORLEN+1]; + + major_ver = tvb_get_guint8(tvb, offset); + minor_ver = tvb_get_guint8(tvb, offset + 1); + proto_tree_add_text(tree, tvb, offset, 2, + "Protocol version: %u.%u", major_ver, minor_ver); + offset += 2; + + result = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 1, + "Result: %s (%u)", cntrlresulttype2str(result), result); + offset += 1; + + error = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 1, + "Error: %s (%u)", errortype2str(error), error); + offset += 1; + + frame = tvb_get_ntohl(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 4, + "Framing capabilities: %s (%u)", frametype2str(frame), frame); + offset += 4; + + bearer = tvb_get_ntohl(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 4, + "Bearer capabilities: %s (%u)", bearertype2str(bearer), bearer); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 2, + "Maximum channels: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Firmware revision: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + tvb_memcpy(tvb, host, offset, HOSTLEN); + host[HOSTLEN] = '\0'; + proto_tree_add_text(tree, tvb, offset, HOSTLEN, + "Hostname: %s", host); + offset += HOSTLEN; + + tvb_memcpy(tvb, vendor, offset, VENDORLEN); + vendor[VENDORLEN] = '\0'; + proto_tree_add_text(tree, tvb, offset, VENDORLEN, + "Vendor: %s", vendor); +} + +static void +dissect_stop_req(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + guint8 reason; + + reason = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 1, + "Reason: %s (%u)", reasontype2str(reason), reason); + offset += 1; + + proto_tree_add_text(tree, tvb, offset, 1, + "Reserved: %u", tvb_get_guint8(tvb, offset)); + offset += 1; + + proto_tree_add_text(tree, tvb, offset, 2, + "Reserved: %u", tvb_get_ntohs(tvb, offset)); +} + +static void +dissect_stop_reply(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + guint8 result; + guint8 error; + + result = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 1, + "Result: %s (%u)", stopresulttype2str(result), result); + offset += 1; + + error = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 1, + "Error: %s (%u)", errortype2str(error), error); + offset += 1; + + proto_tree_add_text(tree, tvb, offset, 2, + "Reserved: %u", tvb_get_ntohs(tvb, offset)); +} + +static void +dissect_echo_req(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + proto_tree_add_text(tree, tvb, offset, 4, + "Identifier: %u", tvb_get_ntohl(tvb, offset)); +} + +static void +dissect_echo_reply(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + guint8 result; + guint8 error; + + proto_tree_add_text(tree, tvb, offset, 4, + "Identifier: %u", tvb_get_ntohl(tvb, offset)); + offset += 4; + + result = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 1, + "Result: %s (%u)", echoresulttype2str(result), result); + offset += 1; + + error = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, sizeof(error), + "Error: %s (%u)", errortype2str(error), error); + offset += 1; + + proto_tree_add_text(tree, tvb, offset, 2, + "Reserved: %u", tvb_get_ntohs(tvb, offset)); +} + +static void +dissect_out_req(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + guint32 bearer; + guint32 frame; + guint8 phone[PHONELEN+1]; + guint8 subaddr[SUBADDRLEN+1]; + + proto_tree_add_text(tree, tvb, offset, 2, + "Call ID: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Call Serial Number: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 4, + "Minimum BPS: %u", tvb_get_ntohl(tvb, offset)); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 4, + "Maximum BPS: %u", tvb_get_ntohl(tvb, offset)); + offset += 4; + + bearer = tvb_get_ntohl(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 4, + "Bearer capabilities: %s (%u)", bearertype2str(bearer), bearer); + offset += 4; + + frame = tvb_get_ntohl(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 4, + "Framing capabilities: %s (%u)", frametype2str(frame), frame); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 2, + "Receive window size: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Processing delay: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Phone number length: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Reserved: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + tvb_memcpy(tvb, phone, offset, PHONELEN); + phone[PHONELEN] = '\0'; + proto_tree_add_text(tree, tvb, offset, PHONELEN, + "Phone number: %s", phone); + offset += PHONELEN; + + tvb_memcpy(tvb, subaddr, offset, SUBADDRLEN); + subaddr[SUBADDRLEN] = '\0'; + proto_tree_add_text(tree, tvb, offset, SUBADDRLEN, + "Subaddress: %s", subaddr); +} + +static void +dissect_out_reply(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + guint8 result; + guint8 error; + + proto_tree_add_text(tree, tvb, offset, 2, + "Call ID: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Peer's call ID: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + result = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 1, + "Result: %s (%u)", outresulttype2str(result), result); + offset += 1; + + error = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 1, + "Error: %s (%u)", errortype2str(error), error); + offset += 1; + + proto_tree_add_text(tree, tvb, offset, 2, + "Cause code: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 4, + "Connect speed: %u", tvb_get_ntohl(tvb, offset)); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 2, + "Receive window size: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Processing delay: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 4, + "Physical channel ID: %u", tvb_get_ntohl(tvb, offset)); +} + +static void +dissect_in_req(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + guint32 bearer; + guint8 dialed[PHONELEN+1]; + guint8 dialing[PHONELEN+1]; + guint8 subaddr[SUBADDRLEN+1]; + + proto_tree_add_text(tree, tvb, offset, 2, + "Call ID: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Call serial number: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + bearer = tvb_get_ntohl(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 4, + "Bearer capabilities: %s (%u)", bearertype2str(bearer), bearer); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 4, + "Physical channel ID: %u", tvb_get_ntohl(tvb, offset)); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 2, + "Dialed number length: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Dialing number length: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + tvb_memcpy(tvb, dialing, offset, PHONELEN); + dialed[PHONELEN] = '\0'; + proto_tree_add_text(tree, tvb, offset, PHONELEN, + "Dialed number: %s", dialed); + offset += PHONELEN; + + tvb_memcpy(tvb, dialing, offset, PHONELEN); + dialing[PHONELEN] = '\0'; + proto_tree_add_text(tree, tvb, offset, PHONELEN, + "Dialing number: %s", dialing); + offset += PHONELEN; + + tvb_memcpy(tvb, subaddr, offset, SUBADDRLEN); + subaddr[SUBADDRLEN] = '\0'; + proto_tree_add_text(tree, tvb, offset, SUBADDRLEN, + "Subaddress: %s", subaddr); +} + +static void +dissect_in_reply(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + guint8 result; + guint8 error; + + proto_tree_add_text(tree, tvb, offset, 2, + "Call ID: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Peer's call ID: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + result = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 1, + "Result: %s (%u)", inresulttype2str(result), result); + offset += 1; + + error = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 1, + "Error: %s (%u)", errortype2str(error), error); + offset += 1; + + proto_tree_add_text(tree, tvb, offset, 2, + "Receive window size: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Processing delay: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Reserved: %u", tvb_get_ntohs(tvb, offset)); +} + +static void +dissect_in_connected(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + guint32 frame; + + proto_tree_add_text(tree, tvb, offset, 2, + "Peer's call ID: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Reserved: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 4, + "Connect speed: %u", tvb_get_ntohl(tvb, offset)); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 2, + "Receive window size: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Processing delay: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + frame = tvb_get_ntohl(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 4, + "Framing capabilities: %s (%u)", frametype2str(frame), frame); +} + +static void +dissect_clear_req(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + proto_tree_add_text(tree, tvb, offset, 2, + "Call ID: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Reserved: %u", tvb_get_ntohs(tvb, offset)); +} + +static void +dissect_disc_notify(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + guint8 result; + guint8 error; + guint8 stats[STATSLEN+1]; + + proto_tree_add_text(tree, tvb, offset, 2, + "Call ID: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + result = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 1, + "Result: %s (%u)", discresulttype2str(result), result); + offset += 1; + + error = tvb_get_guint8(tvb, offset); + proto_tree_add_text(tree, tvb, offset, 1, + "Error: %s (%u)", errortype2str(error), error); + offset += 1; + + proto_tree_add_text(tree, tvb, offset, 2, + "Cause code: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Reserved: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + tvb_memcpy(tvb, stats, offset, STATSLEN); + stats[STATSLEN] = '\0'; + proto_tree_add_text(tree, tvb, offset, STATSLEN, + "Call statistics: %s", stats); +} + +static void +dissect_error_notify(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + proto_tree_add_text(tree, tvb, offset, 2, + "Peer's call ID: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Reserved: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 4, + "CRC errors: %u", tvb_get_ntohl(tvb, offset)); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 4, + "Framing errors: %u", tvb_get_ntohl(tvb, offset)); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 4, + "Hardware overruns: %u", tvb_get_ntohl(tvb, offset)); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 4, + "Buffer overruns: %u", tvb_get_ntohl(tvb, offset)); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 4, + "Time-out errors: %u", tvb_get_ntohl(tvb, offset)); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 4, + "Alignment errors: %u", tvb_get_ntohl(tvb, offset)); +} + +static void +dissect_set_link(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, + proto_tree *tree) +{ + proto_tree_add_text(tree, tvb, offset, 2, + "Peer's call ID: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 2, + "Reserved: %u", tvb_get_ntohs(tvb, offset)); + offset += 2; + + proto_tree_add_text(tree, tvb, offset, 4, + "Send ACCM: %#08x", tvb_get_ntohl(tvb, offset)); + offset += 4; + + proto_tree_add_text(tree, tvb, offset, 4, + "Recv ACCM: %#08x", tvb_get_ntohl(tvb, offset)); +} + +void +proto_register_pptp(void) +{ + static gint *ett[] = { + &ett_pptp, + }; + + static hf_register_info hf[] = { + { &hf_pptp_message_type, + { "Message type", "pptp.type", + FT_UINT16, BASE_DEC, VALS(msgtype_vals), 0x0, + "PPTP message type", HFILL }} + }; + + proto_pptp = proto_register_protocol("Point-to-Point Tunnelling Protocol", + "PPTP", "pptp"); + proto_register_field_array(proto_pptp, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); +} + +void +proto_reg_handoff_pptp(void) +{ + dissector_handle_t pptp_handle; + + pptp_handle = create_dissector_handle(dissect_pptp, proto_pptp); + dissector_add("tcp.port", TCP_PORT_PPTP, pptp_handle); + data_handle = find_dissector("data"); +} |