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packet-hicp.c
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packet-hicp.c
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/* packet-hicp.c
* Routines for Host IP Configuration Protocol dissection
* Copyright 2021, Filip Kågesson <exfik@hms.se>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <config.h>
#include <epan/packet.h>
#include <epan/expert.h>
#include <epan/strutil.h>
void proto_reg_handoff_hicp(void);
void proto_register_hicp(void);
static dissector_handle_t hicp_handle;
/* Protocols and header fields. */
static int proto_hicp;
static int hf_hicp_cmd;
static int hf_hicp_proto_version;
static int hf_hicp_fb_type;
static int hf_hicp_module_version;
static int hf_hicp_mac;
static int hf_hicp_ip;
static int hf_hicp_sn;
static int hf_hicp_gw;
static int hf_hicp_dhcp;
static int hf_hicp_pswd_required;
static int hf_hicp_hn;
static int hf_hicp_dns1;
static int hf_hicp_dns2;
static int hf_hicp_ext;
static int hf_hicp_pswd;
static int hf_hicp_new_pswd;
static int hf_hicp_new_mac;
static int hf_hicp_status;
static int hf_hicp_error;
static int hf_hicp_target;
static int hf_hicp_src;
static expert_field ei_hicp_error;
static gint ett_hicp;
#define HICP_PORT 3250
#define HICP_MIN_LENGTH 2
#define HICP_DELIMITER ";"
/* Values of the supported commands. */
#define HICP_MODULE_SCAN_COMMAND "Module scan"
#define HICP_CONFIG_COMMAND "Configure"
#define HICP_WINK_COMMAND "Wink"
/* Values of the supported parameters. */
#define HICP_PROTOCOL_VERSION "Protocol version"
#define HICP_FB_TYPE "FB type"
#define HICP_MODULE_VERSION "Module version"
#define HICP_MAC "MAC"
#define HICP_IP "IP"
#define HICP_SN "SN"
#define HICP_GW "GW"
#define HICP_DHCP "DHCP"
#define HICP_PSWD_REQUIRED "PSWD"
#define HICP_HN "HN"
#define HICP_DNS1 "DNS1"
#define HICP_DNS2 "DNS2"
#define HICP_EXT "EXT"
#define HICP_PSWD "Password"
#define HICP_NEW_PSWD "New Password"
#define HICP_NEW_MAC "New MAC"
#define HICP_RECONFIGURED "Reconfigured"
#define HICP_INVALID_PSWD "Invalid Password"
#define HICP_INVALID_CONFIG "Invalid Configuration"
#define HICP_TO "To"
#define HICP_EXECUTED "Executed"
static int
dissect_hicp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
proto_item* ti;
proto_item* error_pi;
proto_tree* hicp_tree;
guint offset = 0;
gint lengthp = 0;
gdouble ext_value = 0;
const char* parameters_ptr = NULL;
gchar** parameters = NULL;
gchar* parameter_value = NULL;
/* Check that the packet does not start with the header of Secure Host IP Configuration Protocol (SHICP). */
if ((tvb_get_guint16(tvb, offset, ENC_LITTLE_ENDIAN) & 0xFFFE) == 0xABC0) {
return 0;
}
col_set_str(pinfo->cinfo, COL_PROTOCOL, "HICP");
col_clear(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item(tree, proto_hicp, tvb, offset, -1, ENC_NA);
hicp_tree = proto_item_add_subtree(ti, ett_hicp);
parameters_ptr = tvb_get_stringz_enc(pinfo->pool, tvb, offset, &lengthp, ENC_ASCII);
parameters = wmem_strsplit(pinfo->pool, (const gchar*)parameters_ptr, HICP_DELIMITER, -1);
for (guint i = 0; i < g_strv_length(parameters); i++) {
if (g_strrstr(parameters[i], " = ") != NULL) {
parameter_value = &(g_strrstr(parameters[i], " = "))[3];
}
else if (g_strrstr(parameters[i], ": ") != NULL) {
parameter_value = &(g_strrstr(parameters[i], ": "))[2];
}
else {
parameter_value = "";
}
if (g_ascii_strncasecmp(parameters[i], HICP_MODULE_SCAN_COMMAND, (gsize)strlen(HICP_MODULE_SCAN_COMMAND)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_cmd, tvb, offset, (gint)strlen(parameters[i]), HICP_MODULE_SCAN_COMMAND);
col_prepend_fstr(pinfo->cinfo, COL_INFO, "Request message, Command: %s", HICP_MODULE_SCAN_COMMAND);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_CONFIG_COMMAND, (gsize)strlen(HICP_CONFIG_COMMAND)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_cmd, tvb, offset, (gint)strlen(parameters[i]), HICP_CONFIG_COMMAND);
proto_tree_add_string(hicp_tree, hf_hicp_target, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
col_prepend_fstr(pinfo->cinfo, COL_INFO, "Request message, Command: %s", HICP_CONFIG_COMMAND);
col_append_fstr(pinfo->cinfo, COL_INFO, ", Module MAC address: %s", parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_WINK_COMMAND, (gsize)strlen(HICP_WINK_COMMAND)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_cmd, tvb, offset, (gint)strlen(parameters[i]), HICP_WINK_COMMAND);
col_prepend_fstr(pinfo->cinfo, COL_INFO, "Request message, Command: %s", HICP_WINK_COMMAND);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_PROTOCOL_VERSION, (gsize)strlen(HICP_PROTOCOL_VERSION)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_cmd, tvb, offset, (gint)strlen(parameters[i]), HICP_MODULE_SCAN_COMMAND);
proto_tree_add_string(hicp_tree, hf_hicp_proto_version, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
col_prepend_fstr(pinfo->cinfo, COL_INFO, "Response message, Command: %s", HICP_MODULE_SCAN_COMMAND);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_FB_TYPE, (gsize)strlen(HICP_FB_TYPE)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_fb_type, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_MODULE_VERSION, (gsize)strlen(HICP_MODULE_VERSION)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_module_version, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_MAC, (gsize)strlen(HICP_MAC)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_mac, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
col_append_fstr(pinfo->cinfo, COL_INFO, ", Module MAC address: %s", parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_IP, (gsize)strlen(HICP_IP)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_ip, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_SN, (gsize)strlen(HICP_SN)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_sn, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_GW, (gsize)strlen(HICP_GW)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_gw, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_DHCP, (gsize)strlen(HICP_DHCP)) == 0) {
proto_tree_add_string(hicp_tree,
hf_hicp_dhcp,
tvb,
offset,
(gint)strlen(parameters[i]),
g_ascii_strcasecmp(parameter_value, "ON") == 0 ? "Enabled" : "Disabled");
}
else if (g_ascii_strncasecmp(parameters[i], HICP_PSWD_REQUIRED, (gsize)strlen(HICP_PSWD_REQUIRED)) == 0) {
proto_tree_add_string(hicp_tree,
hf_hicp_pswd_required,
tvb,
offset,
(gint)strlen(parameters[i]),
g_ascii_strcasecmp(parameter_value, "ON") == 0 ? "Required" : "Not required");
}
else if (g_ascii_strncasecmp(parameters[i], HICP_HN, (gsize)strlen(HICP_HN)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_hn, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_DNS1, (gsize)strlen(HICP_DNS1)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_dns1, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_DNS2, (gsize)strlen(HICP_DNS2)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_dns2, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_EXT, (gsize)strlen(HICP_EXT)) == 0) {
ext_value = g_ascii_strtod(parameter_value, NULL);
if (ext_value == 1) {
parameter_value = HICP_WINK_COMMAND;
}
else if (ext_value == 0) {
parameter_value = "None";
}
proto_tree_add_string(hicp_tree, hf_hicp_ext, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_PSWD, (gsize)strlen(HICP_PSWD)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_pswd, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_NEW_PSWD, (gsize)strlen(HICP_NEW_PSWD)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_new_pswd, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_NEW_MAC, (gsize)strlen(HICP_NEW_MAC)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_new_mac, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_RECONFIGURED, (gsize)strlen(HICP_RECONFIGURED)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_status, tvb, offset, (gint)strlen(parameters[i]), HICP_RECONFIGURED);
proto_tree_add_string(hicp_tree, hf_hicp_src, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
col_prepend_fstr(pinfo->cinfo, COL_INFO, "Respond message, Command: %s", HICP_CONFIG_COMMAND);
col_append_fstr(pinfo->cinfo, COL_INFO, ", Module MAC address: %s", parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_INVALID_PSWD, (gsize)strlen(HICP_INVALID_PSWD)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_src, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
error_pi = proto_tree_add_string(hicp_tree, hf_hicp_error, tvb, offset, (gint)strlen(parameters[i]), HICP_INVALID_PSWD);
expert_add_info(pinfo, error_pi, &ei_hicp_error);
col_prepend_fstr(pinfo->cinfo, COL_INFO, "Error: %s", HICP_INVALID_PSWD);
col_append_fstr(pinfo->cinfo, COL_INFO, ", Command: %s, Module MAC address: %s", HICP_CONFIG_COMMAND, parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_INVALID_CONFIG, (gsize)strlen(HICP_INVALID_CONFIG)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_src, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
error_pi = proto_tree_add_string(hicp_tree, hf_hicp_error, tvb, offset, (gint)strlen(parameters[i]), HICP_INVALID_CONFIG);
expert_add_info(pinfo, error_pi, &ei_hicp_error);
col_prepend_fstr(pinfo->cinfo, COL_INFO, "Error: %s", HICP_INVALID_CONFIG);
col_append_fstr(pinfo->cinfo, COL_INFO, ", Command: %s, Module MAC address: %s", HICP_CONFIG_COMMAND, parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_EXECUTED, (gsize)strlen(HICP_EXECUTED)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_status, tvb, offset, (gint)strlen(parameters[i]), HICP_EXECUTED);
proto_tree_add_string(hicp_tree, hf_hicp_src, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
col_prepend_fstr(pinfo->cinfo, COL_INFO, "Respond message, Command: %s", HICP_WINK_COMMAND);
col_append_fstr(pinfo->cinfo, COL_INFO, ", Module MAC address: %s", parameter_value);
}
else if (g_ascii_strncasecmp(parameters[i], HICP_TO, (gsize)strlen(HICP_TO)) == 0) {
proto_tree_add_string(hicp_tree, hf_hicp_target, tvb, offset, (gint)strlen(parameters[i]), parameter_value);
col_append_fstr(pinfo->cinfo, COL_INFO, ", Module MAC address: %s", parameter_value);
}
offset += (guint)strlen(parameters[i]) + (guint)strlen(HICP_DELIMITER);
}
return tvb_captured_length(tvb);
}
void
proto_register_hicp(void)
{
expert_module_t* expert_hicp;
static hf_register_info hf[] = {
{ &hf_hicp_cmd,
{ "Command", "hicp.cmd",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_proto_version,
{ "Protocol version", "hicp.protoversion",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_fb_type,
{ "Fieldbus type", "hicp.fbtype",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_module_version,
{ "Module version", "hicp.moduleversion",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_mac,
{ "MAC address", "hicp.mac",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_ip,
{ "IP address", "hicp.ip",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_sn,
{ "Subnet mask", "hicp.sn",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_gw,
{ "Gateway address", "hicp.gw",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_dhcp,
{ "DHCP", "hicp.dhcp",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_pswd_required,
{ "Password", "hicp.pswdrequired",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_hn,
{ "Hostname", "hicp.hn",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_dns1,
{ "Primary DNS address", "hicp.dns1",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_dns2,
{ "Secondary DNS", "hicp.dns2",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_ext,
{ "Extended commands supported", "hicp.ext",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_pswd,
{ "Password", "hicp.pswd",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_new_pswd,
{ "New password", "hicp.newpswd",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_new_mac,
{ "New MAC address", "hicp.newmac",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_status,
{ "Status", "hicp.status",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_error,
{ "Error", "hicp.error",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_target,
{ "Target", "hicp.target",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_hicp_src,
{ "Source", "hicp.src",
FT_STRINGZ, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
}
};
static gint *ett[] = {
&ett_hicp
};
static ei_register_info ei[] = {
{ &ei_hicp_error,
{ "hicp.error", PI_RESPONSE_CODE, PI_NOTE,
"Message contains an error message.", EXPFILL }
}
};
proto_hicp = proto_register_protocol("Host IP Configuration Protocol", "HICP", "hicp");
proto_register_field_array(proto_hicp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_hicp = expert_register_protocol(proto_hicp);
expert_register_field_array(expert_hicp, ei, array_length(ei));
hicp_handle = register_dissector("hicp", dissect_hicp, proto_hicp);
}
void
proto_reg_handoff_hicp(void)
{
dissector_add_uint("udp.port", HICP_PORT, hicp_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/