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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| //----------------------------------------------------------------------------- | ||
| // Copyright 2019 Thiago Alves | ||
| // This file is part of the OpenPLC Software Stack. | ||
| // | ||
| // OpenPLC 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 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // OpenPLC 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 OpenPLC. If not, see <http://www.gnu.org/licenses/>. | ||
| //------ | ||
| // | ||
| // This file has all the EtherNet/IP functions supported by the OpenPLC. If any | ||
| // other function is to be added to the project, it must be added here | ||
| // Thiago Alves, Apr 2019 | ||
| //----------------------------------------------------------------------------- | ||
|
|
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| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <unistd.h> | ||
| #include <pthread.h> | ||
| #include <time.h> | ||
| #include <string.h> | ||
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| #include "ladder.h" | ||
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| #define ENIP_MIN_LENGTH 28 | ||
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| struct enip_header | ||
| { | ||
| unsigned char *command;//[2]; | ||
| unsigned char *length;//[2]; | ||
| unsigned char *session_handle;//[4]; | ||
| unsigned char *status;//[4]; | ||
| unsigned char *sender_context;//[8]; | ||
| unsigned char *options;//[4]; | ||
| unsigned char *data; | ||
| }; | ||
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| struct enip_data | ||
| { | ||
| unsigned char *interface_handle; | ||
| unsigned char *timeout; | ||
| unsigned char *item_count; | ||
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| unsigned char *item1_id; | ||
| unsigned char *item1_length; | ||
| unsigned char *item1_data; | ||
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| unsigned char *item2_id; | ||
| unsigned char *item2_length; | ||
| unsigned char *item2_data; | ||
| }; | ||
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| thread_local unsigned char enip_session[4]; | ||
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| int respondToError(unsigned char *buffer, int buffer_size, int error_code) | ||
| { | ||
| return -1; | ||
| } | ||
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| int parseEnipHeader(unsigned char *buffer, int buffer_size, struct enip_header *header) | ||
| { | ||
| //verify if message is big enough | ||
| if (buffer_size < ENIP_MIN_LENGTH) | ||
| return -1; | ||
|
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| header->command = &buffer[0]; | ||
| header->length = &buffer[2]; | ||
| header->session_handle = &buffer[4]; | ||
| header->status = &buffer[8]; | ||
| header->sender_context = &buffer[12]; | ||
| header->options = &buffer[20]; | ||
| /* | ||
| memcpy(header->command, &buffer[0], 2); | ||
| memcpy(header->length, &buffer[2], 2); | ||
| memcpy(header->session_handle, &buffer[4], 4); | ||
| memcpy(header->status, &buffer[8], 4); | ||
| memcpy(header->sender_context, &buffer[12], 8); | ||
| memcpy(header->options, &buffer[20], 4); | ||
| */ | ||
| header->data = &buffer[24]; | ||
|
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| uint16_t enip_data_size = ((uint16_t)header->length[1] << 8) | (uint16_t)header->length[0]; | ||
|
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| //verify if buffer_size matches enip_data_size | ||
| if (buffer_size - 24 < enip_data_size) | ||
| return -1; | ||
|
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| return enip_data_size; | ||
| } | ||
|
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| int parseEnipData(struct enip_header *header, struct enip_data *data) | ||
| { | ||
| data->interface_handle = &header->data[0]; | ||
| data->timeout = &header->data[4]; | ||
| data->item_count = &header->data[6]; | ||
| data->item1_id = &header->data[8]; | ||
| data->item1_length = &header->data[10]; | ||
| data->item1_data = &header->data[12]; | ||
|
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| uint16_t item_length = ((uint16_t)data->item1_length[1] << 8) | (uint16_t)data->item1_length[0]; | ||
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| data->item2_id = &header->data[12+item_length]; | ||
| data->item2_length = &header->data[14+item_length]; | ||
| data->item2_data = &header->data[16+item_length]; | ||
|
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| return 1; | ||
| } | ||
|
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| int registerEnipSession(struct enip_header *header) | ||
| { | ||
| unsigned char r[4]; | ||
| srand((unsigned)time(NULL)); | ||
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| for (int i = 0; i < 4; ++i) | ||
| r[i] = rand(); | ||
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| memcpy(header->session_handle, &r[0], 4); | ||
| memcpy(&enip_session[0], &r[0], 4); | ||
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| return ENIP_MIN_LENGTH; | ||
| } | ||
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| //----------------------------------------------------------------------------- | ||
| // This function must parse and process the client request and write back the | ||
| // response for it. The return value is the size of the response message in | ||
| // bytes. | ||
| //----------------------------------------------------------------------------- | ||
| int processEnipMessage(unsigned char *buffer, int buffer_size) | ||
| { | ||
| int error_code; | ||
| struct enip_header header; | ||
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| error_code = parseEnipHeader(buffer, buffer_size, &header); | ||
| if (error_code < 0) | ||
| return respondToError(buffer, buffer_size, error_code); | ||
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| if (header.command[0] == 0x65) | ||
| return registerEnipSession(&header); | ||
|
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| else if (header.command[0] == 0x6f) | ||
| { | ||
| struct enip_data data; | ||
| error_code = parseEnipData(&header, &data); | ||
| if (error_code < 0) | ||
| return respondToError(buffer, buffer_size, error_code); | ||
|
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| if (data.item2_id[0] == 0x91) | ||
| { | ||
| //PCCC type 1 - Unknown | ||
| } | ||
| else if (data.item2_id[0] == 0xb2) | ||
| { | ||
| //PCCC type 2 - Unconnected Data Item | ||
| } | ||
| else if (data.item1_id[0] == 0xa1 && data.item2_id[0] == 0xb1) | ||
| { | ||
| //PCCC type 3 - Connected Data Item | ||
| } | ||
| else | ||
| { | ||
| //Unknown type ID. Respond with error_code | ||
| } | ||
| } | ||
|
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| else | ||
| { | ||
| unsigned char log_msg[1000]; | ||
| unsigned char *p = log_msg; | ||
| p += sprintf(p, "Unknown EtherNet/IP request: "); | ||
| for (int i = 0; i < buffer_size; i++) | ||
| { | ||
| p += sprintf(p, "%02x ", (unsigned char)buffer[i]); | ||
| } | ||
| p += sprintf(p, "\n"); | ||
| printf(log_msg); | ||
|
|
||
| return -1; | ||
| } | ||
| } |
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