├── .github └── workflows │ └── build.yml ├── .gitignore ├── LICENSE ├── Makefile ├── README.md ├── example.conf ├── include ├── array.h ├── data-types.h ├── functions.h ├── ns_arp.h ├── ns_arp_packet.h ├── ns_config.h ├── ns_error.h ├── ns_ethernet.h ├── ns_ipv4.h ├── ns_log.h ├── ns_packet_processor.h ├── ns_sniffer.h └── ns_utils.h └── src ├── get_gateway_ip.c ├── main.c ├── string.c └── targets.c /.github/workflows/build.yml: -------------------------------------------------------------------------------- 1 | name: C/C++ CI 2 | 3 | on: 4 | push: 5 | branches: [ master ] 6 | pull_request: 7 | branches: [ master ] 8 | schedule: 9 | # rebuild once a week at 20:40 10 | # TIP: Choose a random time here so not all repositories are build at once: 11 | # https://www.random.org/clock-times/?num=1&earliest=01%3A00&latest=08%3A00&interval=5&format=html&rnd=new 12 | - cron: '40 20 */7 * *' 13 | 14 | jobs: 15 | build: 16 | 17 | runs-on: ubuntu-latest 18 | 19 | steps: 20 | - uses: actions/checkout@v2 21 | - name: make 22 | run: make 23 | 24 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | 2 | *.o 3 | 4 | /wake-on-arp 5 | 6 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | src = $(wildcard src/*.c) 2 | obj = $(src:.c=.o) 3 | 4 | PREFIX ?= /usr/local 5 | CONFIG_PREFIX ?= /etc 6 | 7 | CFLAGS = -I./include -DCONFIG_PREFIX=\"$(CONFIG_PREFIX)\" 8 | LDFLAGS = -O2 9 | 10 | all: wake-on-arp 11 | 12 | debug: LDFLAGS = -static-libasan 13 | debug: CFLAGS += -g -DDEBUG -Wall -Wextra -fsanitize=address,undefined,pointer-compare,pointer-subtract -fno-omit-frame-pointer 14 | debug: wake-on-arp 15 | 16 | wake-on-arp: $(obj) 17 | $(CC) -o $@ $^ $(CFLAGS) $(LDFLAGS) 18 | 19 | install: 20 | install -Dm755 wake-on-arp $(PREFIX)/bin/wake-on-arp 21 | test -f $(CONFIG_PREFIX)/wake-on-arp.conf || install -Dm600 example.conf $(CONFIG_PREFIX)/wake-on-arp.conf 22 | 23 | .PHONY: clean 24 | clean: 25 | rm -f $(obj) wake-on-arp 26 | 27 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # wake-on-arp 2 | [![Build](https://github.com/nikp123/wake-on-arp/actions/workflows/build.yml/badge.svg)](https://github.com/nikp123/wake-on-arp/actions/workflows/build.yml) 3 | [![Donation](https://img.shields.io/liberapay/patrons/nikp123.svg?logo=liberapay)](https://liberapay.com/nikp123/donate) 4 | 5 | An commandline daemon that wakes up a device on the local network when accessed 6 | 7 | # What does this do, exactly? 8 | You could think of this program as an "automatic Wake-On-LAN" daemon. 9 | 10 | Let's suppose you have a large server, media box or even your PC 11 | and you want to easily access those devices from a network while saving power. 12 | 13 | Instead of manually sending WOL "magic packets" using a program or app, 14 | what if instead we could wake up the device when accessed. Example being, 15 | ssh-ing into a Mac Mini while in sleep mode. 16 | 17 | # How does it do this? 18 | 19 | Well, quite simply actually. It detects outgoing ARP requests (basically asking 20 | the router whether or not we can get to the device) and if they match the host 21 | and target it sends a WOL packet. 22 | 23 | ## Don't modern network cards feature "ARP mode" by default? 24 | 25 | Yes, but not all of them. Certain Broadcom ethernet chips do not feature waking on ARP, 26 | which forced me to make this program by myself. 27 | 28 | ### WAIT, THERE's A ARP MODE? 29 | 30 | ``sudo ethtool -s yournetworkdevice0 wol a`` 31 | 32 | You'll get a ``Operation not supported`` otherwise if your card doesn't support it. 33 | 34 | ## You are lazy 35 | 36 | Most programmers are lazy bastards. 37 | 38 | # What is the use-case of this? 39 | 40 | Use-case 1: Large server that drains Watts upon Watts of power and your landowner is 41 | yelling at you because of the high-power bills. But you have a small and power-efficient 42 | secondary device, such as a Raspberry Pi that could indeed run 24/7 without using much power. 43 | Using the Raspberry Pi, you could route all the big server traffic to the Raspberry Pi and 44 | using simple proxies reroute it back to the big server. Nginx supports this out of the box. 45 | This assumes you know how to automatically suspend your server, which I won't get into. 46 | 47 | Use-case 2: You are too lazy to wake up your NAS at home using a 3rd party program, so instead you 48 | can run this as a daemon in the background on any UNIX-like OS. Don't worry, this program uses only 49 | a few kilobytes of RAM and barely any CPU time since it's all UNIX code without any dependencies. 50 | 51 | # What do I need to run this? 52 | * A functioning and complete computer that runs a UNIX-like OS 53 | * A network card (Wi-Fi works too) and connection too 54 | * A device that supports WOL 55 | * Any functional C compiler in existence and make 56 | 57 | # How to compile 58 | 59 | ``make`` 60 | 61 | # How to run 62 | 63 | ``./wake-on-arp -h`` to see what arguments you have to fill in 64 | 65 | ## I don't want to fill in commandline arguments in my init script/daemon! 66 | 67 | There's a config file for that, it's (usually) located in ``/etc/wake-on-arp.conf`` 68 | 69 | However, it's only there when you run ``make install`` 70 | 71 | # How to install 72 | 73 | Once compiled, 74 | ``make install`` (as root) 75 | 76 | ## Systemd.service example 77 | 78 | If you like, you can use systemd to run and monitor this tool 79 | 80 | `sudo vi /lib/systemd/system/wakeonarp.service` 81 | 82 | ```INI 83 | [Unit] 84 | Description=Wake on LAN based on ARP 85 | After=network-online.target network.target rsyslog.service 86 | Wants=network-online.target network.target rsyslog.service 87 | 88 | [Service] 89 | Type=simple 90 | ExecStart=/usr/local/bin/wake-on-arp 91 | Restart=on-failure 92 | #in case network was not online 93 | RestartSec=15 94 | 95 | [Install] 96 | WantedBy=multi-user.target 97 | ``` 98 | 99 | `sudo systemctl enable wakeonarp.service` 100 | 101 | `sudo systemctl start wakeonarp.service` 102 | 103 | ## Configure persistent logging for analytics 104 | 105 | If you use a subnet mask fitting the whole network, you may want to monitor which IP did wake up your target. 106 | 107 | If the event was in the last few days or since the last reboot, you don't need any additional configuration and can just use 108 | 109 | `systemctl status wakeonarp.service` or `journalctl -u wakeonarp.service` 110 | 111 | But if you need to archiv the wakeup reasons, you may want to store it outside of the journal files with the help of rsyslog. 112 | 113 | `sudo vi /etc/rsyslog.d/wake-on-arp.conf` 114 | 115 | ``` 116 | if $programname == 'wake-on-arp' then /var/log/wake-on-arp.log 117 | ``` 118 | 119 | `sudo systemctl restart rsyslog` 120 | 121 | 122 | # LICENSE 123 | It's included in this repository. However, since the repository features code from other projects, 124 | it also includes licenses from these repositories (for those specific parts): 125 | * https://github.com/meetrp/sniffer.c 126 | * https://github.com/GramThanos/WakeOnLAN 127 | * This I guess: https://stackoverflow.com/a/2283541/3832385 128 | 129 | -------------------------------------------------------------------------------- /example.conf: -------------------------------------------------------------------------------- 1 | # Broadcast IP address 2 | broadcast_ip 192.168.1.255 3 | 4 | # Target IP and MAC address pairs 5 | target_ip_1 192.168.1.2 6 | target_mac_1 01:23:45:56:78:9a 7 | 8 | # Network device to scan on 9 | net_device eth0 10 | 11 | # Net mask that describes which source IP's are allowed 12 | subnet 24 13 | 14 | # Allow the gateway (your router) to send ARP requests, stops misbehaving routers 15 | allow_gateway false 16 | 17 | # Ignores ARP requests from this IP (you can add as many of these as you like) 18 | source_exclude 192.168.1.5 19 | 20 | -------------------------------------------------------------------------------- /include/array.h: -------------------------------------------------------------------------------- 1 | // liv's code, not mine actually 2 | // so the license applies on her terms 3 | 4 | #ifndef ARRAY_H 5 | #define ARRAY_H 6 | 7 | #include 8 | #include 9 | 10 | struct _ArrayHeader { 11 | size_t count, capacity; 12 | }; 13 | 14 | #define ARRAY_INITIAL_SIZE 8 15 | 16 | #define _arr_header(a) ((struct _ArrayHeader*)(a) - 1) 17 | 18 | #define arr_init(a) arr_init_n((a), ARRAY_INITIAL_SIZE) 19 | 20 | #define arr_init_n(a, n) do { \ 21 | struct _ArrayHeader *header; \ 22 | header = malloc(sizeof(*header) + (sizeof(*(a)) * (n))); \ 23 | header->count = 0; \ 24 | header->capacity = (n); \ 25 | (a) = (void*)(header + 1); \ 26 | } while(0) 27 | 28 | #define arr_count(a) (_arr_header(a)->count) 29 | #define arr_capacity(a) (_arr_header(a)->capacity) 30 | 31 | #define arr_back(a) ((a)[arr_count(a) - 1]) 32 | #define arr_pop(a) ((a)[_arr_header(a)->count--]) 33 | 34 | #define arr_reserve(a, n) do { \ 35 | if(n <= arr_capacity(a)) break; \ 36 | struct _ArrayHeader *header = _arr_header(a); \ 37 | header->capacity = n; \ 38 | (a) = (void*)((struct _ArrayHeader*)realloc( \ 39 | header, sizeof(*header) + (sizeof(*(a)) * (n))) + 1); \ 40 | } while(0) 41 | 42 | #define arr_resize(a, n) do { \ 43 | arr_reserve((a), (n)); \ 44 | _arr_header(a)->count = n; \ 45 | } while(0) 46 | 47 | #define arr_resize_zero(a, n) do { \ 48 | size_t initial_count = arr_count(a); \ 49 | arr_resize((a), (n)); \ 50 | if(arr_count(a) > initial_count) \ 51 | memset( \ 52 | &(a)[initial_count], 0, \ 53 | (arr_count(a) - initial_count) * sizeof(*a)); \ 54 | } while(0) 55 | 56 | // Take a vararg list to support compound literals 57 | #define arr_add(a, ...) do { \ 58 | struct _ArrayHeader *header = _arr_header(a); \ 59 | if(header->count == header->capacity) \ 60 | arr_reserve((a), header->capacity << 1); \ 61 | (a)[_arr_header(a)->count++] = (__VA_ARGS__); \ 62 | } while(0) 63 | 64 | #define arr_free(a) do { \ 65 | free(_arr_header(a)); \ 66 | } while(0) 67 | 68 | #define arr_find(a, val, idx) do { \ 69 | *idx = -1; \ 70 | for(size_t i = 0; i < arr_count((a)); i++) { \ 71 | if((a)[i] == val) { \ 72 | *idx = i; \ 73 | break; \ 74 | } \ 75 | } \ 76 | } while(0) 77 | 78 | #endif 79 | 80 | -------------------------------------------------------------------------------- /include/data-types.h: -------------------------------------------------------------------------------- 1 | #ifndef __DATA_TYPES_H 2 | #define __DATA_TYPES_H 3 | 4 | #include 5 | 6 | struct target { 7 | unsigned char ip[4]; 8 | unsigned char mac[6]; 9 | unsigned char magic[102]; 10 | char *ip_s; 11 | char *mac_s; 12 | bool populated; 13 | }; 14 | 15 | #endif 16 | 17 | -------------------------------------------------------------------------------- /include/functions.h: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | #include "data-types.h" 5 | 6 | int get_gateway_ip(unsigned char *gateway_ip, char *net_interface); 7 | bool the_great_bool_destringifier(const char *s); 8 | void print_ip(unsigned int ip); 9 | 10 | void target_ip_add(struct target *list, unsigned int id, char *string); 11 | void target_mac_add(struct target *list, unsigned int id, char *string); 12 | int targets_configure(struct target *list); 13 | void targets_destroy(struct target *list); 14 | -------------------------------------------------------------------------------- /include/ns_arp.h: -------------------------------------------------------------------------------- 1 | /* 2 | * The MIT License (MIT) 3 | * 4 | * Copyright (c) 2015 Rp 5 | * 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy 7 | * of this software and associated documentation files (the "Software"), to 8 | * deal in the Software without restriction, including without limitation the 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 | * sell copies of the Software, and to permit persons to whom the Software is 11 | * furnished to do so, subject to the following conditions: 12 | * 13 | * The above copyright notice and this permission notice shall be included in 14 | * all copies or substantial portions of the Software. 15 | * 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 | * DEALINGS IN THE SOFTWARE. 24 | * 25 | */ 26 | 27 | /* 28 | * ns_arp.h 29 | * 30 | * Created on : 03-Nov-2015 31 | * Author : rp 32 | * Date : 8:46:46 pm 33 | */ 34 | 35 | #ifndef NS_ARP_H_ 36 | #define NS_ARP_H_ 37 | 38 | #include "ns_config.h" 39 | 40 | #include "ns_utils.h" 41 | #include "ns_ethernet.h" 42 | #include "ns_error.h" 43 | 44 | #include "ns_arp_packet.h" 45 | 46 | /* 47 | * IPv4 over Ethernet ARP payload 48 | */ 49 | typedef struct _ns_arp_IPv4_eth_packet { 50 | ns_arp_packet_hdr_t ns_arp_hdr; 51 | 52 | /* addresses */ 53 | unsigned char ns_arp_sender_hw_addr[NS_ETH_ADDR_LEN]; 54 | unsigned char ns_arp_sender_proto_addr[NS_IPv4_ADDR_LEN]; 55 | unsigned char ns_arp_target_hw_addr[NS_ETH_ADDR_LEN]; 56 | unsigned char ns_arp_target_proto_addr[NS_IPv4_ADDR_LEN]; 57 | } ns_arp_IPv4_eth_packet_t; 58 | 59 | /* 60 | * exported function declarations 61 | */ 62 | PUBLIC ns_error_t parse_arp_packet(IN unsigned char *); 63 | 64 | #endif /* NS_ARP_H_ */ 65 | -------------------------------------------------------------------------------- /include/ns_arp_packet.h: -------------------------------------------------------------------------------- 1 | /* 2 | * The MIT License (MIT) 3 | * 4 | * Copyright (c) 2015 Rp 5 | * 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy 7 | * of this software and associated documentation files (the "Software"), to 8 | * deal in the Software without restriction, including without limitation the 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 | * sell copies of the Software, and to permit persons to whom the Software is 11 | * furnished to do so, subject to the following conditions: 12 | * 13 | * The above copyright notice and this permission notice shall be included in 14 | * all copies or substantial portions of the Software. 15 | * 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 | * DEALINGS IN THE SOFTWARE. 24 | * 25 | */ 26 | 27 | /* 28 | * ns_arp_packet.h 29 | * 30 | * Created on : 03-Nov-2015 31 | * Author : rp 32 | * Date : 10:50:46 pm 33 | */ 34 | 35 | #ifndef NS_ARP_PACKET_H_ 36 | #define NS_ARP_PACKET_H_ 37 | 38 | #include /* uint16_t and likes */ 39 | 40 | /************************************************************ 41 | * ARP FRAME HDR FORMAT 42 | * 43 | * 2 2 1 1 2 Bytes/Octets 44 | * ----------------------------------------------- 45 | * | HW | Proto | HW Addr | Proto Addr | Op | 46 | * | Type | Type | Len | Len | Code | 47 | * ----------------------------------------------- 48 | ************************************************************/ 49 | 50 | /* 51 | * Magic Constants as per the RFC 52 | */ 53 | #define NS_ARP_ETHERNET_TYPE 1 /* Ethernet 10/100Mbps */ 54 | 55 | /* 56 | * ARP protocol opcodes 57 | */ 58 | #define NS_ARP_REQUEST 1 /* ARP request. */ 59 | #define NS_ARP_REPLY 2 /* ARP reply. */ 60 | 61 | typedef struct _ns_arp_packet_hdr { 62 | uint16_t ns_arp_hw_type; 63 | uint16_t ns_arp_proto_type; 64 | uint8_t ns_arp_hw_addr_len; 65 | uint8_t ns_arp_proto_addr_len; 66 | uint16_t ns_arp_opcode; 67 | } ns_arp_packet_hdr_t; 68 | 69 | /* ToDo: Move to IPv4 based file */ 70 | #define NS_IPv4_ADDR_LEN 4 /* Length of IPv4 addr */ 71 | #define NS_ARP_TYPE_STR_LEN 8 72 | 73 | #define NS_ARP_REPLY_BUF_LEN 42 /* Size of ARP reply */ 74 | 75 | #endif /* NS_ARP_PACKET_H_ */ 76 | -------------------------------------------------------------------------------- /include/ns_config.h: -------------------------------------------------------------------------------- 1 | /* 2 | * The MIT License (MIT) 3 | * 4 | * Copyright (c) 2015 Rp 5 | * 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy 7 | * of this software and associated documentation files (the "Software"), to 8 | * deal in the Software without restriction, including without limitation the 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 | * sell copies of the Software, and to permit persons to whom the Software is 11 | * furnished to do so, subject to the following conditions: 12 | * 13 | * The above copyright notice and this permission notice shall be included in 14 | * all copies or substantial portions of the Software. 15 | * 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 | * DEALINGS IN THE SOFTWARE. 24 | * 25 | */ 26 | 27 | /* 28 | * ns_config.h 29 | * 30 | * Created on : 03-Nov-2015 31 | * Author : rp 32 | * Date : 12:52:52 am 33 | */ 34 | 35 | #ifndef NS_CONFIG_H_ 36 | #define NS_CONFIG_H_ 37 | 38 | #define DEFAULT_NETWORK_INTERFACE "eth0" 39 | #define DEFAULT_BUF_SIZE 2048 40 | 41 | #define DEFAULT_ARP_RESPONSE_ITERATION 5 42 | 43 | /* useful for coding */ 44 | #define PUBLIC 45 | #define PRIVATE static 46 | 47 | #define IN const 48 | #define OUT 49 | #define INOUT 50 | 51 | #endif /* NS_CONFIG_H_ */ 52 | -------------------------------------------------------------------------------- /include/ns_error.h: -------------------------------------------------------------------------------- 1 | /* 2 | * The MIT License (MIT) 3 | * 4 | * Copyright (c) 2015 Rp 5 | * 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy 7 | * of this software and associated documentation files (the "Software"), to deal 8 | * in the Software without restriction, including without limitation the rights 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 | * copies of the Software, and to permit persons to whom the Software is 11 | * furnished to do so, subject to the following conditions: 12 | * 13 | * The above copyright notice and this permission notice shall be included in all 14 | * copies or substantial portions of the Software. 15 | * 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 | * DEALINGS IN THE SOFTWARE. 24 | * 25 | */ 26 | 27 | /* 28 | * ns_error.h 29 | * 30 | * Created on : 03-Nov-2015 31 | * Author : rp 32 | * Date : 1:00:53 am 33 | */ 34 | 35 | #ifndef NS_ERROR_H_ 36 | #define NS_ERROR_H_ 37 | 38 | typedef enum { 39 | /* generic system failures */ 40 | ns_success, 41 | ns_failure, 42 | ns_malloc_failed, 43 | 44 | /* generic network failures */ 45 | ns_socket_failed, 46 | ns_recvfrom_received_no_data, 47 | ns_unknown_host, 48 | ns_ioctl_failed, 49 | ns_interface_error, 50 | ns_sendto_failed, 51 | ns_bind_failed, 52 | 53 | /* ethernet */ 54 | ns_eth_empty_packet, 55 | ns_eth_bad_packet_size, 56 | ns_eth_broadcast, 57 | 58 | /* arp */ 59 | ns_not_ethernet_arp_packet, 60 | ns_not_ipv4_arp_packet, 61 | ns_not_ipv4_arp_request_packet 62 | } ns_error_t; 63 | 64 | #endif /* NS_ERROR_H_ */ 65 | -------------------------------------------------------------------------------- /include/ns_ethernet.h: -------------------------------------------------------------------------------- 1 | /* 2 | * The MIT License (MIT) 3 | * 4 | * Copyright (c) 2015 Rp 5 | * 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy 7 | * of this software and associated documentation files (the "Software"), to deal 8 | * in the Software without restriction, including without limitation the rights 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 | * copies of the Software, and to permit persons to whom the Software is 11 | * furnished to do so, subject to the following conditions: 12 | * 13 | * The above copyright notice and this permission notice shall be included in all 14 | * copies or substantial portions of the Software. 15 | * 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 | * DEALINGS IN THE SOFTWARE. 24 | * 25 | */ 26 | 27 | /* 28 | * ns_ethernet.h 29 | * 30 | * Created on : 03-Nov-2015 31 | * Author : rp 32 | * Date : 11:00:19 pm 33 | */ 34 | 35 | #ifndef NS_ETHERNET_H_ 36 | #define NS_ETHERNET_H_ 37 | 38 | #include /* uint16_t and likes */ 39 | #include /* NULL */ 40 | 41 | #include "ns_error.h" /* error states */ 42 | #include "ns_config.h" 43 | 44 | /************************************************************ 45 | * ETHERNET FRAME FORMAT 46 | * 47 | * 6 6 2 (var) 4 Bytes/Octets 48 | * ----------------------------------------------------------------- 49 | * | destination | source | ether | payload | CRC | 50 | * | mac addr | mac addr | type | | | 51 | * ----------------------------------------------------------------- 52 | ************************************************************/ 53 | 54 | /* 55 | * Magic Constants as per the RFC 56 | */ 57 | #define NS_ETH_ADDR_LEN 6 /* # of octets in MAC addr */ 58 | #define NS_ETH_TYPE_LEN 2 /* # of octets for type */ 59 | #define NS_ETH_MIN_PAYLOAD_LEN 28 /* min octects in a payload */ 60 | #define NS_ETH_MAX_PAYLOAD_LEN 1504 /* max octets in a payload */ 61 | 62 | /* 63 | * Protocol ID 64 | */ 65 | #define NS_ETH_TYPE_IPv4 0x0800 /* IPv4 */ 66 | #define NS_ETH_TYPE_ARP 0x0806 /* Address Resolution packet */ 67 | #define NS_ETH_TYPE_IPv6 0x86DD /* IPv6 */ 68 | 69 | /* 70 | * Ethernet-II (802.3) header 71 | */ 72 | #define NS_ETH_HDR_LEN \ 73 | ( \ 74 | NS_ETH_ADDR_LEN + /* Dest MAC */ \ 75 | NS_ETH_ADDR_LEN + /* Src MAC */ \ 76 | NS_ETH_TYPE_LEN /* Ether Type */ \ 77 | ) 78 | 79 | typedef struct _ns_ethernet_frame_hdr { 80 | unsigned char ns_eth_dest[NS_ETH_ADDR_LEN]; 81 | unsigned char ns_eth_src[NS_ETH_ADDR_LEN]; 82 | uint16_t ns_eth_type; 83 | } ns_ethernet_frame_hdr_t; 84 | 85 | /* 86 | * minimum # of octets in a Ethernet-II (802.3) frame (sans CRC) 87 | */ 88 | #define NS_ETH_MIN_LEN \ 89 | ( \ 90 | NS_ETH_HDR_LEN + /* ethernet hdr */ \ 91 | NS_ETH_MIN_PAYLOAD_LEN /* min payload */ \ 92 | ) 93 | 94 | /* 95 | * maximum # of octets in a Ethernet-II (802.3) frame (sans CRC) 96 | */ 97 | #define NS_ETH_MAX_LEN \ 98 | ( \ 99 | NS_ETH_HDR_LEN + /* ethernet hdr */ \ 100 | NS_ETH_MAX_PAYLOAD_LEN /* max payload */ \ 101 | ) 102 | 103 | /* 104 | * print len 105 | */ 106 | #define NS_ETH_TYPE_STR_LEN 6 107 | 108 | PUBLIC ns_error_t parse_ethernet_packet(IN unsigned char *, IN int, 109 | OUT unsigned char**, OUT uint16_t*); 110 | 111 | #endif /* NS_ETHERNET_H_ */ 112 | -------------------------------------------------------------------------------- /include/ns_ipv4.h: -------------------------------------------------------------------------------- 1 | /* 2 | * The MIT License (MIT) 3 | * 4 | * Copyright (c) 2015 Rp 5 | * 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy 7 | * of this software and associated documentation files (the "Software"), to 8 | * deal in the Software without restriction, including without limitation the 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 | * sell copies of the Software, and to permit persons to whom the Software is 11 | * furnished to do so, subject to the following conditions: 12 | * 13 | * The above copyright notice and this permission notice shall be included in 14 | * all copies or substantial portions of the Software. 15 | * 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 | * DEALINGS IN THE SOFTWARE. 24 | * 25 | */ 26 | 27 | /* 28 | *ns_ipv4.h 29 | * 30 | * Created on : 05-May-2016 31 | * Author : rp 32 | * Date : 3:24:27 pm 33 | */ 34 | 35 | #ifndef NS_IPV4_H_ 36 | #define NS_IPV4_H_ 37 | 38 | #include /* uint16_t and likes */ 39 | 40 | #include "ns_config.h" 41 | 42 | #define NS_IPv4_ICMP_PROTO 1 43 | #define NS_IPv4_IGMP_PROTO 2 44 | #define NS_IPv4_TCP_PROTO 6 45 | #define NS_IPv4_UDP_PROTO 17 46 | 47 | #define NS_IPv4_TYPE_STR_LEN 8 48 | 49 | /* 50 | * IP structure 51 | */ 52 | typedef struct _ns_IPv4_packet { 53 | #if __BYTE_ORDER__ == __LITTLE_ENDIAN__ 54 | uint8_t ns_ipv4_hdr_len :4; 55 | uint8_t ns_ipv4_ver :4; 56 | #else 57 | uint8_t ns_ipv4_ver :4; 58 | uint8_t ns_ipv4_hdr_len :4; 59 | #endif 60 | uint8_t ns_ipv4_tos; 61 | uint16_t ns_ipv4_len; /* data & header */ 62 | uint16_t ns_ipv4_id; 63 | uint16_t ns_ipv4_offset; /* flags + fragment offset */ 64 | uint8_t ns_ipv4_ttl; 65 | uint8_t ns_ipv4_proto; 66 | uint16_t ns_ipv4_checksum; 67 | 68 | uint32_t ns_ipv4_src; 69 | uint32_t ns_ipv4_dest; 70 | }__attribute__ ((packed)) ns_IPv4_packet_t; 71 | 72 | /* 73 | * exported function declarations 74 | */ 75 | PUBLIC ns_error_t parse_ipv4_packet(IN unsigned char *); 76 | 77 | #endif /* NS_IPV4_H_ */ 78 | -------------------------------------------------------------------------------- /include/ns_log.h: -------------------------------------------------------------------------------- 1 | /* 2 | * The MIT License (MIT) 3 | * 4 | * Copyright (c) 2015 Rp 5 | * 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy 7 | * of this software and associated documentation files (the "Software"), to deal 8 | * in the Software without restriction, including without limitation the rights 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 | * copies of the Software, and to permit persons to whom the Software is 11 | * furnished to do so, subject to the following conditions: 12 | * 13 | * The above copyright notice and this permission notice shall be included in all 14 | * copies or substantial portions of the Software. 15 | * 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 | * DEALINGS IN THE SOFTWARE. 24 | * 25 | */ 26 | 27 | /* 28 | * ns_log.h 29 | * 30 | * Created on : 03-Nov-2015 31 | * Author : rp 32 | * Date : 1:03:35 am 33 | */ 34 | 35 | #ifndef NS_LOG_H_ 36 | #define NS_LOG_H_ 37 | 38 | #include 39 | 40 | // TODO: define a proper logger framework into a file 41 | 42 | void log_print(char *, unsigned int, char *, char *, ...); 43 | 44 | #define ERR(...) log_print(__FILE__,__LINE__, "ERR", __VA_ARGS__) 45 | #define DBG(...) log_print(__FILE__,__LINE__, "DBG", __VA_ARGS__) 46 | 47 | #endif /* NS_LOG_H_ */ 48 | -------------------------------------------------------------------------------- /include/ns_packet_processor.h: -------------------------------------------------------------------------------- 1 | /* 2 | * The MIT License (MIT) 3 | * 4 | * Copyright (c) 2015 Rp 5 | * 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy 7 | * of this software and associated documentation files (the "Software"), to deal 8 | * in the Software without restriction, including without limitation the rights 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 | * copies of the Software, and to permit persons to whom the Software is 11 | * furnished to do so, subject to the following conditions: 12 | * 13 | * The above copyright notice and this permission notice shall be included in all 14 | * copies or substantial portions of the Software. 15 | * 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 | * DEALINGS IN THE SOFTWARE. 24 | * 25 | */ 26 | 27 | /* 28 | * ns_packet_processor.h 29 | * 30 | * Created on : 03-Nov-2015 31 | * Author : rp 32 | * Date : 1:29:26 am 33 | */ 34 | 35 | #ifndef NS_PACKET_PROCESSOR_H_ 36 | #define NS_PACKET_PROCESSOR_H_ 37 | 38 | void process_packet(IN unsigned char *, IN int); 39 | 40 | #endif /* NS_PACKET_PROCESSOR_H_ */ 41 | -------------------------------------------------------------------------------- /include/ns_sniffer.h: -------------------------------------------------------------------------------- 1 | /* 2 | * The MIT License (MIT) 3 | * 4 | * Copyright (c) 2015 Rp 5 | * 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy 7 | * of this software and associated documentation files (the "Software"), to 8 | * deal in the Software without restriction, including without limitation the 9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 | * sell copies of the Software, and to permit persons to whom the Software is 11 | * furnished to do so, subject to the following conditions: 12 | * 13 | * The above copyright notice and this permission notice shall be included in 14 | * all copies or substantial portions of the Software. 15 | * 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 | * DEALINGS IN THE SOFTWARE. 24 | * 25 | */ 26 | 27 | /* 28 | * ns_sniffer.h 29 | * 30 | * Created on : 03-Nov-2015 31 | * Author : rp 32 | * Date : 12:48:52 am 33 | */ 34 | 35 | #ifndef NS_SNIFFER_H_ 36 | #define NS_SNIFFER_H_ 37 | 38 | #include 39 | #include 40 | 41 | #include "ns_log.h" 42 | #include "ns_error.h" 43 | 44 | PUBLIC ns_error_t sniffer(void); 45 | 46 | #endif /* NS_SNIFFER_H_ */ 47 | -------------------------------------------------------------------------------- /include/ns_utils.h: -------------------------------------------------------------------------------- 1 | /* 2 | * The MIT License (MIT) 3 | * 4 | * Copyright (c) 2015 Rp 5 | * 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy 7 | * of this software and associated documentation files (the "Software"), to deal 8 | * in the Software without restriction, including without limitation the rights 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 | * copies of the Software, and to permit persons to whom the Software is 11 | * furnished to do so, subject to the following conditions: 12 | * 13 | * The above copyright notice and this permission notice shall be included in all 14 | * copies or substantial portions of the Software. 15 | * 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 | * DEALINGS IN THE SOFTWARE. 24 | * 25 | */ 26 | 27 | /* 28 | * ns_utils.h 29 | * 30 | * Created on : 03-Nov-2015 31 | * Author : rp 32 | * Date : 7:48:19 pm 33 | */ 34 | 35 | #ifndef NS_UTILS_H_ 36 | #define NS_UTILS_H_ 37 | 38 | #include 39 | #include 40 | 41 | #include "ns_error.h" 42 | #include "ns_config.h" 43 | 44 | #define MAC_ADDR_LEN 6 45 | #define IPv4_ADDR_LEN 4 46 | 47 | /* printable MAC address length */ 48 | #define NS_ETH_IPv4_PRINTABLE_MAC_SIZE 24 49 | #define NS_ETH_IPv4_PRINTABLE_IPv4_SIZE 24 50 | 51 | PUBLIC void human_readable_MAC(IN unsigned char*, OUT char*); 52 | PUBLIC void human_readable_IPv4(IN unsigned char*, OUT char*); 53 | 54 | PUBLIC char* human_readable_IPV4_from_number(IN uint32_t ip, char* ip_str); 55 | 56 | PUBLIC ns_error_t get_ip_addr_from_name(IN char*, OUT struct in_addr*); 57 | PUBLIC ns_error_t get_MAC_from_device_name(IN char*, OUT unsigned char*); 58 | 59 | #endif /* NS_UTILS_H_ */ 60 | -------------------------------------------------------------------------------- /src/get_gateway_ip.c: -------------------------------------------------------------------------------- 1 | // COPYRIGHT NOTICE: 2 | // Copy-pasted from and full credit to: 3 | // https://www.linuxquestions.org/questions/linux-networking-3/howto-find-gateway-address-through-code-397078/#post2023303 4 | 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include 10 | #include 11 | #include 12 | #include 13 | #include 14 | #include 15 | #include 16 | 17 | #include 18 | 19 | #include 20 | #include 21 | #include 22 | 23 | #define BUFSIZE 8192 24 | 25 | struct route_info{ 26 | struct in_addr dstAddr; 27 | struct in_addr srcAddr; 28 | struct in_addr gateWay; 29 | char ifName[IF_NAMESIZE]; 30 | }; 31 | 32 | int readNlSock(int sockFd, char *bufPtr, unsigned int seqNum, unsigned int pId){ 33 | struct nlmsghdr *nlHdr; 34 | int readLen = 0, msgLen = 0; 35 | 36 | do{ 37 | /* Recieve response from the kernel */ 38 | if((readLen = recv(sockFd, bufPtr, BUFSIZE - msgLen, 0)) < 0){ 39 | perror("SOCK READ: "); 40 | return -1; 41 | } 42 | 43 | nlHdr = (struct nlmsghdr *)bufPtr; 44 | 45 | /* Check if the header is valid */ 46 | if((NLMSG_OK(nlHdr, readLen) == 0) || (nlHdr->nlmsg_type == NLMSG_ERROR)) 47 | { 48 | perror("Error in recieved packet"); 49 | return -1; 50 | } 51 | 52 | /* Check if the its the last message */ 53 | if(nlHdr->nlmsg_type == NLMSG_DONE) { 54 | break; 55 | } 56 | else{ 57 | /* Else move the pointer to buffer appropriately */ 58 | bufPtr += readLen; 59 | msgLen += readLen; 60 | } 61 | 62 | /* Check if its a multi part message */ 63 | if((nlHdr->nlmsg_flags & NLM_F_MULTI) == 0) { 64 | /* return if its not */ 65 | break; 66 | } 67 | } while((nlHdr->nlmsg_seq != seqNum) || (nlHdr->nlmsg_pid != pId)); 68 | return msgLen; 69 | } 70 | 71 | /* For parsing the route info returned */ 72 | void parseRoutes(struct nlmsghdr *nlHdr, struct route_info *rtInfo, 73 | unsigned char *gateway_ip, char *net_interface) 74 | { 75 | // FIXME: Check if gateway is IPv6 and abort accordingly 76 | 77 | struct rtmsg *rtMsg; 78 | struct rtattr *rtAttr; 79 | int rtLen; 80 | 81 | rtMsg = (struct rtmsg *)NLMSG_DATA(nlHdr); 82 | 83 | /* If the route is not for AF_INET or does not belong to main routing table 84 | then return. */ 85 | if((rtMsg->rtm_family != AF_INET) || (rtMsg->rtm_table != RT_TABLE_MAIN)) 86 | return; 87 | 88 | /* get the rtattr field */ 89 | rtAttr = (struct rtattr *)RTM_RTA(rtMsg); 90 | rtLen = RTM_PAYLOAD(nlHdr); 91 | for(;RTA_OK(rtAttr,rtLen);rtAttr = RTA_NEXT(rtAttr,rtLen)){ 92 | switch(rtAttr->rta_type) { 93 | case RTA_OIF: 94 | if_indextoname(*(int *)RTA_DATA(rtAttr), rtInfo->ifName); 95 | break; 96 | case RTA_GATEWAY: 97 | memcpy(&rtInfo->gateWay, RTA_DATA(rtAttr), sizeof(rtInfo->gateWay)); 98 | break; 99 | case RTA_PREFSRC: 100 | memcpy(&rtInfo->srcAddr, RTA_DATA(rtAttr), sizeof(rtInfo->srcAddr)); 101 | break; 102 | case RTA_DST: 103 | memcpy(&rtInfo->dstAddr, RTA_DATA(rtAttr), sizeof(rtInfo->dstAddr)); 104 | break; 105 | } 106 | } 107 | 108 | // check that it ain't the default OS gateway 109 | if (strstr((char *)inet_ntoa(rtInfo->dstAddr), "0.0.0.0")) { 110 | // the network interface must match 111 | if(strcmp(net_interface, rtInfo->ifName)) 112 | return; 113 | 114 | *((unsigned int*)gateway_ip) = rtInfo->gateWay.s_addr; 115 | } 116 | 117 | return; 118 | } 119 | 120 | int get_gateway_ip(unsigned char *gateway_ip, char *net_interface) 121 | { 122 | struct nlmsghdr *nlMsg; 123 | struct route_info *rtInfo; 124 | char msgBuf[BUFSIZE]; 125 | 126 | int sock, len = 0; 127 | unsigned int msgSeq = 0; 128 | 129 | /* Create Socket */ 130 | if((sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE)) < 0) 131 | perror("Socket Creation: "); 132 | 133 | /* Initialize the buffer */ 134 | memset(msgBuf, 0, BUFSIZE); 135 | 136 | /* point the header and the msg structure pointers into the buffer */ 137 | nlMsg = (struct nlmsghdr *)msgBuf; 138 | 139 | /* Fill in the nlmsg header*/ 140 | nlMsg->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); // Length of message. 141 | nlMsg->nlmsg_type = RTM_GETROUTE; // Get the routes from kernel routing table . 142 | 143 | nlMsg->nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST; // The message is a request for dump. 144 | nlMsg->nlmsg_seq = msgSeq++; // Sequence of the message packet. 145 | nlMsg->nlmsg_pid = getpid(); // PID of process sending the request. 146 | 147 | /* Send the request */ 148 | if(send(sock, nlMsg, nlMsg->nlmsg_len, 0) < 0){ 149 | printf("Write To Socket Failed...\n"); 150 | return -1; 151 | } 152 | 153 | /* Read the response */ 154 | if((len = readNlSock(sock, msgBuf, msgSeq, getpid())) < 0) { 155 | printf("Read From Socket Failed...\n"); 156 | return -1; 157 | } 158 | 159 | /* Parse and print the response */ 160 | rtInfo = (struct route_info *)malloc(sizeof(struct route_info)); 161 | 162 | /* THIS IS THE NETTSTAT -RL code I commented out the printing here and in parse routes */ 163 | for(;NLMSG_OK(nlMsg,len);nlMsg = NLMSG_NEXT(nlMsg,len)){ 164 | memset(rtInfo, 0, sizeof(struct route_info)); 165 | parseRoutes(nlMsg, rtInfo, gateway_ip, net_interface); 166 | } 167 | free(rtInfo); 168 | close(sock); 169 | 170 | return 0; 171 | } 172 | 173 | -------------------------------------------------------------------------------- /src/main.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include // for standard things 4 | #include // malloc 5 | #include // strlen 6 | #include 7 | 8 | #include 9 | #include 10 | #include // provides declarations for ip header 11 | #include // for ETH_P_ALL 12 | #include // for ether_header 13 | #include 14 | #include 15 | #include 16 | #include 17 | #include 18 | #include 19 | #include 20 | #include 21 | 22 | #include "ns_arp.h" 23 | #include "ns_arp_packet.h" 24 | 25 | #include "array.h" 26 | #include "functions.h" 27 | 28 | #ifndef CONFIG_PREFIX 29 | #error "Please specify CONFIG_PREFIX (usually /etc on Linux)" 30 | #endif 31 | 32 | // RETurn ON FAILure 33 | #define RETONFAIL(x) { int a = x; if(a) return a; } 34 | 35 | // FAILure ON ARGumentS 36 | #define FAILONARGS(i, max) { if(max==i+1) { \ 37 | fprintf(stderr, "Invalid number of arguments!\n"); \ 38 | return -1; } } 39 | 40 | const char *USAGE_INFO = \ 41 | "This program is a daemon wakes up a device on the local\n" 42 | "network based upon if the local system tries to access it\n" 43 | "via LAN network.\n" 44 | "These parameters can also be set in the config file,\n" 45 | "which is located at "CONFIG_PREFIX"/wake-on-arp.conf\n" 46 | "Usage:\n" 47 | "\t-h/--help - this screen\n" 48 | "\t-i - IP address of device to wake up\n" 49 | "\t-m - MAC (hardware) address of device to wake up\n" 50 | "\t-d - network device to check traffic from (eg. eth0)\n" 51 | "\t-b - broadcast IP address (eg. 192.168.1.255)\n" 52 | "\t-s - subnet IP mask (eg. 24)\n" 53 | "\t-ag - send magic packet even if the ARP came from the router/gateway (disabled by default). " 54 | "For further info look here: https://github.com/nikp123/wake-on-arp/issues/1#issuecomment-882708765\n"; 55 | 56 | void cleanup(); 57 | void sig_handler(); 58 | int initialize(); 59 | int watch_packets(); 60 | int process_packet(unsigned char*); 61 | int parse_arp(unsigned char *); 62 | int parse_ethhdr(unsigned char*); 63 | int get_local_ip(); 64 | int send_magic_packet(unsigned char*); 65 | 66 | struct main { 67 | char *eth_dev_s; 68 | char *eth_ip_s; 69 | char *broadcast_ip_s; 70 | char *subnet_s; 71 | char *allow_gateway_s; 72 | 73 | struct target *target_list; 74 | 75 | uint32_t *source_blacklist; 76 | 77 | unsigned char eth_ip[4]; 78 | unsigned char gate_ip[4]; 79 | 80 | unsigned int subnet; 81 | 82 | unsigned char *buffer; 83 | int sock_raw; 84 | bool alive; 85 | } m; 86 | 87 | void cleanup() { 88 | arr_free(m.source_blacklist); 89 | targets_destroy(m.target_list); 90 | close(m.sock_raw); 91 | free(m.buffer); 92 | } 93 | 94 | // handle signals, such as CTRL-C 95 | void sig_handler() { 96 | m.alive = false; 97 | } 98 | 99 | int initialize() { 100 | RETONFAIL(get_local_ip()); 101 | 102 | // get gateway ipv4 :) 103 | RETONFAIL(get_gateway_ip((unsigned char*)&m.gate_ip, m.eth_dev_s)); 104 | 105 | // attach signal handler 106 | struct sigaction action; 107 | memset(&action, 0, sizeof(action)); 108 | action.sa_handler = &sig_handler; 109 | sigaction(SIGINT, &action, NULL); // close by CTRL-C 110 | sigaction(SIGTERM, &action, NULL); // close by task manager and/or kill 111 | 112 | // set alive flag 113 | m.alive = true; 114 | 115 | // allocate memory for storing packets 116 | m.buffer = (unsigned char *) malloc(65536); 117 | 118 | // open the socket 119 | m.sock_raw = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL)) ; 120 | 121 | // listen on a specific network device 122 | setsockopt(m.sock_raw, SOL_SOCKET, SO_BINDTODEVICE, m.eth_dev_s, strlen(m.eth_dev_s)+1); 123 | 124 | if(m.sock_raw < 0) { 125 | perror("socket error"); 126 | return 1; 127 | } 128 | 129 | uint32_t eth_ip = *((uint32_t*)&m.eth_ip); 130 | uint32_t gateway_ip = *((uint32_t*)&m.gate_ip); 131 | 132 | // add gateway to blacklist if needed 133 | bool allow_gateway = false; 134 | if(m.allow_gateway_s) { 135 | allow_gateway = the_great_bool_destringifier(m.allow_gateway_s); 136 | } 137 | 138 | if(!allow_gateway) { 139 | arr_add(m.source_blacklist, gateway_ip); 140 | } 141 | 142 | printf("Listen for ARP requests from Source IPs "); 143 | print_ip(eth_ip&m.subnet); 144 | printf(" - "); 145 | print_ip(eth_ip|~m.subnet); 146 | if(arr_count(m.source_blacklist) != 0) { 147 | printf(" but ignore the following IP(s):"); 148 | 149 | for(size_t i = 0; i < arr_count(m.source_blacklist); i++) { 150 | printf(" "); 151 | print_ip(m.source_blacklist[i]); 152 | } 153 | } 154 | puts(""); 155 | fflush(stdout); //to see this message in systemctl status 156 | 157 | return 0; 158 | } 159 | 160 | int watch_packets() { 161 | int saddr_size, data_size; 162 | struct sockaddr saddr; 163 | 164 | while(m.alive) { 165 | saddr_size = sizeof saddr; 166 | // receive a packet 167 | data_size = recvfrom(m.sock_raw, m.buffer, 65536, 0, &saddr, (socklen_t*)&saddr_size); 168 | if(data_size < 0) { 169 | if(!m.alive) { 170 | return 0; //don't print errors for stop 171 | } 172 | perror("recvfrom failed to get packets"); 173 | return 1; 174 | } 175 | // now process the packet 176 | RETONFAIL(process_packet(m.buffer)); 177 | } 178 | return 0; 179 | } 180 | 181 | int process_packet(unsigned char* buffer) { 182 | // get the IP Header part of this packet, excluding the ethernet header 183 | //struct iphdr *iph = (struct iphdr*)(buffer + sizeof(struct ethhdr)); 184 | 185 | // TODO: Research packet types for ARP 186 | // Known types are: 157 (from router), 87 and 129 187 | //printf("%u\n", iph->protocol); 188 | 189 | // for now, accept all packets 190 | RETONFAIL(parse_ethhdr(buffer)); 191 | 192 | return 0; 193 | } 194 | 195 | int parse_arp(unsigned char *data) { 196 | ns_arp_packet_hdr_t *arp_hdr = (ns_arp_packet_hdr_t *) data; 197 | ns_arp_IPv4_eth_packet_t *arp_IPv4 = NULL; 198 | 199 | if(ntohs(arp_hdr->ns_arp_hw_type) != NS_ARP_ETHERNET_TYPE) { 200 | fprintf(stderr, "dis not ethernet :(\n"); 201 | exit(EXIT_FAILURE); 202 | } 203 | 204 | if(ntohs(arp_hdr->ns_arp_proto_type) != NS_ETH_TYPE_IPv4) { 205 | fprintf(stderr, "i bet you're using IPv4\n"); 206 | exit(EXIT_FAILURE); 207 | } 208 | 209 | arp_IPv4 = (ns_arp_IPv4_eth_packet_t *) data; 210 | 211 | // sender and target hardware 212 | //unsigned char *sh = arp_IPv4->ns_arp_sender_hw_addr; 213 | //unsigned char *th = arp_IPv4->ns_arp_sender_hw_addr; 214 | 215 | // ARP type 216 | uint16_t type = ntohs(arp_IPv4->ns_arp_hdr.ns_arp_opcode); 217 | 218 | if(type == NS_ARP_REQUEST) { 219 | // if source matches to host 220 | // and if target matches send magic 221 | unsigned int eth_ip = *((unsigned int*)&m.eth_ip); 222 | 223 | // sender and target address 224 | unsigned int src_ip, ta_ip; 225 | memcpy(&src_ip, arp_IPv4->ns_arp_sender_proto_addr, sizeof(unsigned int)); 226 | memcpy(&ta_ip, arp_IPv4->ns_arp_target_proto_addr, sizeof(unsigned int)); 227 | 228 | if((eth_ip&m.subnet) == (src_ip&m.subnet)) { 229 | for(size_t i = 0; i < arr_count(m.target_list); i++) { 230 | struct target *link = &m.target_list[i]; 231 | 232 | if(*(unsigned int*)link->ip != ta_ip) 233 | continue; 234 | 235 | int blacklist_found = -1; 236 | arr_find(m.source_blacklist, src_ip, &blacklist_found); 237 | if(blacklist_found > -1) { 238 | #ifdef DEBUG 239 | printf("Blocked '"); 240 | print_ip(src_ip); 241 | puts("' from the blacklist!"); 242 | #endif 243 | break; 244 | } 245 | 246 | RETONFAIL(send_magic_packet(link->magic)); 247 | printf("Magic packet to '"); 248 | print_ip(ta_ip); 249 | printf("' sent by '"); 250 | print_ip(src_ip); 251 | puts("'"); 252 | fflush(stdout); // Write now to get an accurate timestamp for analyzing wake-up reason 253 | break; 254 | } 255 | } 256 | } 257 | return 0; 258 | } 259 | 260 | int parse_ethhdr(unsigned char* buffer) { 261 | struct ethhdr *eth = (struct ethhdr *)buffer; 262 | 263 | // convert network-endianess to native endianess 264 | unsigned short eth_protocol = ntohs(eth->h_proto); 265 | 266 | if(eth_protocol == 0x0806) { 267 | unsigned char* arphdr = buffer + sizeof(struct ethhdr); 268 | RETONFAIL(parse_arp(arphdr)); 269 | } 270 | return 0; 271 | } 272 | 273 | int read_args(int argc, char *argv[]) { 274 | for(int i=1; i 31) { 327 | fprintf(stderr, "Error: Subnet mask must be a value between 0 and 31\n"); 328 | } 329 | 330 | // calculate proper net mask 331 | unsigned int subnet_bigendian = 0xffffffff << (32-mask_value); 332 | m.subnet = __builtin_bswap32(subnet_bigendian); 333 | } 334 | 335 | return 0; 336 | } 337 | 338 | int send_magic_packet(unsigned char *magic_packet) { 339 | int udpSocket = 1; 340 | int broadcast = 1; 341 | struct sockaddr_in udpClient, udpServer; 342 | 343 | // setup broadcast socket 344 | udpSocket = socket(AF_INET, SOCK_DGRAM, 0); 345 | if(setsockopt(udpSocket, SOL_SOCKET, SO_BROADCAST, &broadcast, sizeof(broadcast)) == -1) { 346 | perror("socket error"); 347 | return 1; 348 | } 349 | 350 | // set parameters 351 | udpClient.sin_family = AF_INET; 352 | udpClient.sin_addr.s_addr = INADDR_ANY; 353 | udpClient.sin_port = 0; 354 | 355 | // bind socket 356 | bind(udpSocket, (struct sockaddr*) &udpClient, sizeof(udpClient)); 357 | 358 | // set server end point (the broadcast address) 359 | udpServer.sin_family = AF_INET; 360 | udpServer.sin_addr.s_addr = inet_addr(m.broadcast_ip_s); 361 | udpServer.sin_port = htons(9); 362 | 363 | // set server end point 364 | sendto(udpSocket, magic_packet, sizeof(unsigned char)*102, 0, (struct sockaddr*) &udpServer, sizeof(udpServer)); 365 | 366 | // clean after use 367 | close(udpSocket); 368 | 369 | return 0; 370 | } 371 | 372 | int get_local_ip() { 373 | int fd; 374 | struct ifreq ifr; 375 | 376 | // open socket 377 | fd = socket(AF_INET, SOCK_DGRAM, 0); 378 | 379 | if(fd < 0) { 380 | perror("socket error"); 381 | return 1; 382 | } 383 | 384 | // get a IPv4 address specifically 385 | ifr.ifr_addr.sa_family = AF_INET; 386 | 387 | // get address for the following network device 388 | strncpy(ifr.ifr_name, m.eth_dev_s, IFNAMSIZ-1); 389 | 390 | // go fetch 391 | int error = ioctl(fd, SIOCGIFADDR, &ifr); 392 | if(error == -1) { 393 | perror("ioctl error"); 394 | return 1; 395 | } 396 | 397 | // clean up 398 | close(fd); 399 | 400 | // get the darn address 401 | m.eth_ip_s = inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr); 402 | 403 | // convert IP back to binary 404 | sscanf(m.eth_ip_s, "%hhu.%hhu.%hhu.%hhu", &m.eth_ip[0], 405 | &m.eth_ip[1], &m.eth_ip[2], &m.eth_ip[3]); 406 | return 0; 407 | } 408 | 409 | int load_config() { 410 | FILE *fp = fopen(CONFIG_PREFIX"/wake-on-arp.conf", "r"); 411 | if(!fp) { 412 | fprintf(stderr, "Could not open config file: "CONFIG_PREFIX"/wake-on-arp.conf\n"); 413 | return 1; 414 | } 415 | 416 | // init variables 417 | arr_init(m.source_blacklist); 418 | arr_init(m.target_list); 419 | 420 | char *line = NULL; 421 | size_t len; 422 | while(getline(&line, &len, fp) != -1) { 423 | char *name, *val; 424 | int error = sscanf(line, "%ms %ms", &name, &val); 425 | if(error != 2) continue; 426 | 427 | if(!strcmp("broadcast_ip", name)) { 428 | m.broadcast_ip_s = val; 429 | } else if(!strcmp("net_device", name)) { 430 | m.eth_dev_s = val; 431 | } else if(!strcmp("subnet", name)) { 432 | m.subnet_s = val; 433 | } else if(!strcmp("allow_gateway", name)) { 434 | m.allow_gateway_s = val; 435 | } else if(!strncmp("target_mac", name, 10)) { 436 | unsigned int number = 0; 437 | if(!sscanf(name, "target_mac_%u", &number)) { 438 | fprintf(stderr, "Invalid option '%s', should be like 'target_mac_1' (fxp)", name); 439 | return 2; 440 | } 441 | target_mac_add(m.target_list, number, val); 442 | } else if(!strncmp("target_ip", name, 9)) { 443 | unsigned int number = 0; 444 | if(!sscanf(name, "target_ip_%u", &number)) { 445 | fprintf(stderr, "Invalid option '%s', should be like 'target_ip_1' (fxp)", name); 446 | return 2; 447 | } 448 | target_ip_add(m.target_list, number, val); 449 | } else if(!strcmp("source_exclude", name)) { 450 | uint8_t address[4]; 451 | // assuming IPv4 452 | 453 | int err = sscanf(val, "%hhu.%hhu.%hhu.%hhu", 454 | &address[0], &address[1], &address[2], &address[3]); 455 | 456 | if(err != 4) { 457 | fprintf(stderr, "Invalid IP address specified \"%s\", should be" 458 | " in the following format: \"ab.cd.ef.gh\"\n", val); 459 | return 2; 460 | } 461 | 462 | // add 'em 463 | uint32_t address_ptr = *((uint32_t*)&address); 464 | arr_add(m.source_blacklist, address_ptr); 465 | 466 | free(val); 467 | } else free(val); // not used 468 | 469 | // free unused strings 470 | free(name); 471 | // WARN: if reload is ever implemented, this is a memory leak 472 | } 473 | if(line) free(line); 474 | 475 | // weird seg. fault on ARMv7 (have to investigate) 476 | //fclose(fp); 477 | return 0; 478 | } 479 | 480 | int main(int argc, char *argv[]) { 481 | m.allow_gateway_s = NULL; // init config in case it won't be set 482 | // priority: load_config < read_args 483 | load_config(); 484 | RETONFAIL(read_args(argc, argv)); 485 | RETONFAIL(parse_args()); 486 | RETONFAIL(initialize()); 487 | RETONFAIL(watch_packets()); 488 | cleanup(); 489 | return 0; 490 | } 491 | 492 | 493 | -------------------------------------------------------------------------------- /src/string.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | 5 | // because casting a string hasn't been invented yet 6 | bool the_great_bool_destringifier(const char *s) { 7 | if(!strcmp(s, "true")) return true; 8 | else if(!strcmp(s, "yes")) return true; 9 | else if(!strcmp(s, "1")) return true; 10 | else if(!strcmp(s, "y")) return true; 11 | else if(!strcmp(s, "enable")) return true; 12 | else if(!strcmp(s, "enabled")) return true; 13 | else if(!strcmp(s, "false")) return false; 14 | else if(!strcmp(s, "no")) return false; 15 | else if(!strcmp(s, "0")) return false; 16 | else if(!strcmp(s, "n")) return false; 17 | else if(!strcmp(s, "disable")) return false; 18 | else if(!strcmp(s, "disabled")) return false; 19 | else { 20 | fprintf(stderr, "Invalid bool value of '%s'!\n", s); 21 | } 22 | return false; 23 | } 24 | 25 | // inet_ntoa? 26 | void print_ip(unsigned int ip) { 27 | printf("%hhu.%hhu.%hhu.%hhu", 28 | (unsigned char)(ip&0xff), (unsigned char)(ip>>8&0xff), 29 | (unsigned char)(ip>>16&0xff), (unsigned char)(ip>>24&0xff)); 30 | } 31 | 32 | -------------------------------------------------------------------------------- /src/targets.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | 6 | #include "array.h" 7 | #include "data-types.h" 8 | 9 | void target_generate_magic(struct target *link) { 10 | // 6 x 0xFF on start of packet 11 | memset(link->magic, 0xFF, 6); 12 | 13 | // rest are just copies of the MAC address 14 | for(int i = 1; i <= 16; i++) { 15 | memcpy(&link->magic[i*6], &link->mac, 6*sizeof(unsigned char)); 16 | } 17 | } 18 | 19 | void target_mac_add(struct target *list, unsigned int id, char *string) { 20 | if(id >= arr_count(list)) { 21 | // the hope is that new targets have "populated" unset 22 | arr_resize_zero(list, id+1); 23 | } 24 | 25 | list[id].populated = true; 26 | list[id].mac_s = string; 27 | } 28 | 29 | void target_ip_add(struct target *list, unsigned int id, char *string) { 30 | if(id >= arr_count(list)) { 31 | // the hope is that new targets have "populated" unset 32 | arr_resize_zero(list, id+1); 33 | } 34 | 35 | list[id].populated = true; 36 | list[id].ip_s = string; 37 | } 38 | 39 | int targets_configure(struct target *list) { 40 | for(size_t i = 0; i < arr_count(list); i++) { 41 | if(!list[i].populated) // skip unpopulated ids 42 | continue; 43 | 44 | struct target *ta = &list[i]; 45 | if(ta->mac_s == NULL) { 46 | fprintf(stderr, "Missing element 'target_mac_%lu'\n", i); 47 | return 1; 48 | } 49 | if(ta->ip_s == NULL) { 50 | fprintf(stderr, "Missing element 'target_ip_%lu'\n", i); 51 | return 1; 52 | } 53 | 54 | // device MAC 55 | int error = sscanf(ta->mac_s, "%2hhx:%2hhx:%2hhx:%2hhx:%2hhx:%2hhx", &ta->mac[0], &ta->mac[1], 56 | &ta->mac[2], &ta->mac[3], &ta->mac[4], &ta->mac[5]); 57 | // maybe the user typed it uppercase? 58 | if(error != 6) { 59 | error = sscanf(ta->mac_s, "%2hhX:%2hhX:%2hhX:%2hhX:%2hhX:%2hhX", 60 | &ta->mac[0], &ta->mac[1], &ta->mac[2], &ta->mac[3], &ta->mac[4], &ta->mac[5]); 61 | } 62 | if(error != 6) { 63 | fprintf(stderr, "Invalid 'ta_mac_%lu' address: \"%s\"\n", i, ta->mac_s); 64 | return 2; 65 | } 66 | 67 | // device IP 68 | error = sscanf(ta->ip_s, "%hhu.%hhu.%hhu.%hhu", &ta->ip[0], 69 | &ta->ip[1], &ta->ip[2], &ta->ip[3]); 70 | if(error != 4) { 71 | fprintf(stderr, "Invalid 'ta_ip_%lu' address: \"%s\"\n", i, ta->ip_s); 72 | return 2; 73 | } 74 | 75 | target_generate_magic(ta); 76 | } 77 | 78 | return 0; 79 | } 80 | 81 | void targets_destroy(struct target *list) { 82 | for(size_t i = 0; i < arr_count(list); i++) { 83 | //ip_s and mac_s need a seperate free call because they was malloced with sscanf 84 | free(list[i].ip_s); 85 | free(list[i].mac_s); 86 | } 87 | arr_free(list); 88 | } 89 | 90 | --------------------------------------------------------------------------------