├── .gitignore ├── LICENSE ├── Makefile ├── README.md ├── dnsd.conf ├── google.der ├── inc ├── dnssec.h └── log.h ├── service ├── dnsd ├── dnsd.service └── service.dnsd.plist └── src └── dnssec.c /.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | .vscode/ 3 | dnsd 4 | dnsd.* 5 | -------------------------------------------------------------------------------- /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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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 | all: 2 | $(CC) src/dnssec.c -Iinc -Wall -lcurl -std=gnu11 -o dnsd 3 | install: 4 | mkdir -p /etc/dnsd 5 | cp dnsd.conf /etc/dnsd/dnsd.conf 6 | cp google.der /etc/dnsd/google.der 7 | cp dnsd /usr/local/bin/ 8 | linux-service: 9 | cp service/dnsd.service /lib/systemd/system/ 10 | chmod 644 /lib/systemd/system/dnsd.service 11 | cp service/dnsd /etc/init.d/ 12 | chmod 755 /etc/init.d/dnsd 13 | macos-service: 14 | cp service/service.dnsd.plist /Library/LaunchDaemons 15 | clean: 16 | rm -f dnsd 17 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # DNSd 2 | 3 | DNSd is a daemon a.k.a. service for Unix-like systems. It provides a local DNS backend complying (partially) with [RFC 1035](https://www.ietf.org/rfc/rfc1035.txt) in order to forward the queries/answers to/from Google Public DNS over HTTPS. 4 | 5 | > Google Public DNS offers DNSSEC-validating resolution over an encrypted HTTPS connection. DNS-over-HTTPS greatly enhances privacy and security between a client and a recursive resolver, and complements DNSSEC to provide end-to-end authenticated DNS lookups. 6 | > -- [Google Public DNS](https://developers.google.com/speed/public-dns/docs/dns-over-https) 7 | 8 | ### Highlights 9 | - Ultra lightweight (disk and memory footage). 10 | - Full functionality behind the web proxy out of the box. 11 | - Minimalistic implementation approach. 12 | - Highly configurable through a simple config. file. 13 | - A Self contained package that depends only on [libcurl](https://curl.haxx.se/libcurl/). 14 | - Supported records are **A**,**AAAA**,**CNAME**,**NS** and **MX**. 15 | - Public key pinning 16 | 17 | # Build and Install 18 | Build the software by running the following commands in the terminal. 19 | ``` 20 | make 21 | make install 22 | ``` 23 | You may run the service in the background (as a daemon) by setting the config file path as follows. 24 | ``` 25 | dnsd -f /etc/dnsd.conf 26 | ``` 27 | After the daemon is successfully loaded, the local DNS service is available on the regular DNS port 53. 28 | If you are behind a web proxy server, you need to set its address and port in the configuration file. 29 | 30 | If you would like to add DNSd as a service on your Linux machine, install the launcher (init and systemd) configuration files. 31 | ``` 32 | make linux-service 33 | service dnsd start 34 | ``` 35 | For *systemd* you may need to run ```systemctl daemon-reload``` before starting the service. 36 | 37 | For macOS systems install and launch the service as follows. 38 | ``` 39 | make macos-service 40 | launchctl load -w /Library/LaunchDaemons/service.dnsd.plist 41 | ``` 42 | ### Obtain Public Key 43 | `openssl s_client -connect google.com:443 | openssl x509 -pubkey -noout` 44 | 45 | ### Verification 46 | You can verify wether the service is accessible through 47 | - `host -va github.com localhost` 48 | - `nslookup -port=5454 -query=mx github.com 127.0.0.1` 49 | ``` 50 | Trying "github.com" 51 | Using domain server: 52 | Name: localhost 53 | Address: 127.0.0.1#53 54 | Aliases: 55 | 56 | ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61907 57 | ;; flags: qr rd; QUERY: 1, ANSWER: 11, AUTHORITY: 0, ADDITIONAL: 0 58 | 59 | ;; QUESTION SECTION: 60 | ;github.com. IN ANY 61 | 62 | ;; ANSWER SECTION: 63 | github.com. 299 IN A 192.30.253.112 64 | github.com. 299 IN A 192.30.253.113 65 | github.com. 899 IN NS ns-1283.awsdns-32.org. 66 | github.com. 899 IN NS ns-1707.awsdns-21.co.uk. 67 | github.com. 899 IN NS ns-421.awsdns-52.com. 68 | github.com. 899 IN NS ns-520.awsdns-01.net. 69 | github.com. 3599 IN MX 1 aspmx.l.google.com. 70 | github.com. 3599 IN MX 10 alt3.aspmx.l.google.com. 71 | github.com. 3599 IN MX 10 alt4.aspmx.l.google.com. 72 | github.com. 3599 IN MX 5 alt1.aspmx.l.google.com. 73 | github.com. 3599 IN MX 5 alt2.aspmx.l.google.com. 74 | 75 | Received 390 bytes from 127.0.0.1#53 in 178 ms 76 | ``` 77 | # License 78 | 79 | This software is licensed under the GNU GPLv3 license. 80 | 81 | The user of this software (including the source code and the binary form) must read and accept the terms and conditions of [Google Public DNS](https://developers.google.com/speed/public-dns/docs/dns-over-https) over HTTPS before usage. 82 | -------------------------------------------------------------------------------- /dnsd.conf: -------------------------------------------------------------------------------- 1 | # -------------------------------- 2 | # DNSd default configuration file 3 | # -------------------------------- 4 | # 5 | # If you are behind a proxy, uncomment and modify the following line. 6 | # https_proxy=: 7 | 8 | # The default server URL is set below. 9 | server_url = https://8.8.8.8 10 | 11 | # The local service ip and port 12 | service_port = 53 13 | service_ip = 127.0.0.1 14 | 15 | # EDNS ECS support default is disabled (0) 16 | # to enable change the following line to "enable_edns_ecs=true" 17 | enable_edns_ecs = false -------------------------------------------------------------------------------- /google.der: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/kamarya/dnsd/9a3d234a7009d25a65af40678f27a21f4fbe9ec0/google.der -------------------------------------------------------------------------------- /inc/dnssec.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (C) 2016 Behrooz Kamary 3 | 4 | * This program is free software: you can redistribute it and/or modify 5 | * it under the terms of the GNU General Public License as published by 6 | * the Free Software Foundation, either version 3 of the License, or 7 | * (at your option) any later version. 8 | 9 | * This program is distributed in the hope that it will be useful, 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 | * GNU General Public License for more details. 13 | 14 | * You should have received a copy of the GNU General Public License 15 | * along with this program. If not, see . 16 | */ 17 | 18 | #ifndef _DNSSSEC_H_ 19 | #define _DNSSSEC_H_ 20 | 21 | #define PIDFILE "/var/run/dnsd.pid" 22 | 23 | #define LICENSE "DNSd Copyright (C) 2016 Behrooz Kamary.\n"\ 24 | "This program comes with ABSOLUTELY NO WARRANTY. \n"\ 25 | "You should have received a copy of the GNU General Public License\n"\ 26 | "along with this program. If not, see ." 27 | // Resource Record (RR) 28 | 29 | #define DNS_QR_RESPONSE 0x8000 30 | #define DNS_AUTH_ANS 0x0400 31 | #define DNS_TRUNCATED 0x0200 32 | #define DNS_USE_RECURSION 0x0100 33 | #define DNS_RECURSION_AVAIL 0x0080 34 | 35 | #define DNS_FORMAT_ERROR 0x0001 36 | #define DNS_SERVER_FAILURE 0x0002 37 | #define DNS_NAME_ERROR 0x0003 38 | #define DNS_NOT_IMPLEMENTED 0x0004 39 | #define DNS_REFUSED 0x0005 40 | #define DNS_ERROR_MASK 0x000F 41 | 42 | #define DNS_INET_ADDR 0x0001 43 | 44 | #define DNS_A_RECORD 0x0001 45 | #define DNS_NS_RECORD 0x0002 46 | #define DNS_CNAME_RECORD 0x0005 47 | #define DNS_SOA_RECORD 0x0006 48 | #define DNS_MX_RECORD 0x000F 49 | #define DNS_OPT_RECORD 0x0029 50 | #define DNS_AAAA_RECORD 0x001C 51 | 52 | #define MAX_DOMAIN_LENGTH 255 53 | #define MAX_SUBDOMAIN_LENGTH 63 54 | 55 | #define JSON_NO_ANSWER -1 56 | #define JSON_NULL -2 57 | 58 | #define TRUE 1 59 | #define FALSE 0 60 | 61 | #define OPT_CONIG_FILE_LEN 256 62 | #define OPT_HTTPS_PROXY "https_proxy" 63 | #define OPT_HTTPS_PROXY_LEN 64 64 | #define OPT_SERVER_URL "server_url" 65 | #define OPT_SERVER_URL_LEN 64 66 | #define OPT_SERVER_IP "server_ip_list" 67 | #define OPT_SERVER_IP_LEN 512 68 | #define OPT_ENABLE_EDNS "enable_edns_ecs" 69 | #define OPT_DEFAULT_URL "https://dns.google.com" 70 | #define OPT_SERVICE_PORT "service_port" 71 | #define OPT_SERVICE_IP "service_ip" 72 | #define OPT_SERVICE_PUB_KEY "service_pub_key" 73 | #define OPT_SERVICE_IP_LEN INET6_ADDRSTRLEN 74 | #define OPT_ENABLE_TRUE "true" 75 | #define OPT_ENABLE_FALSE "false" 76 | 77 | #define MX_PREF_MAX_LEN 5 78 | #define DNS_ANSWER_LEN 12 79 | 80 | #define LOG_LEVEL LEV_NO_DEV_LOG 81 | #define DEBUG_ENABLE 0 82 | #define DEBUG_AUDIT_ENABLE 0 83 | #define BUFFER_SIZE 102400 84 | #define DNS_MAX_SIZE 512 85 | #define EDNS_MAX_SIZE 4096 86 | #define DNS_SERVER_PORT 53 87 | #define DNS_SERVER_TIMEOUT 10 88 | 89 | #define UNUSED(x) (void)(x) 90 | 91 | struct func_options 92 | { 93 | char config_file[OPT_CONIG_FILE_LEN]; 94 | char https_proxy[OPT_HTTPS_PROXY_LEN]; 95 | char server_url[OPT_SERVER_URL_LEN]; 96 | char server_ip_list[OPT_SERVER_IP_LEN]; 97 | char service_ip[OPT_SERVICE_IP_LEN]; 98 | char service_pub_key[OPT_CONIG_FILE_LEN]; 99 | uint16_t server_timeout; 100 | uint16_t service_port; 101 | uint8_t enable_debug; 102 | uint8_t enable_edns; 103 | }; 104 | 105 | struct dns_header 106 | { 107 | uint16_t id; 108 | uint16_t flags; 109 | uint16_t q_count; 110 | uint16_t ans_count; 111 | uint16_t auth_count; 112 | uint16_t add_count; 113 | }; 114 | 115 | struct dns_header_detail 116 | { 117 | uint16_t id; // identification number 118 | 119 | uint8_t rd :1; // recursion desired 120 | uint8_t tc :1; // truncated message 121 | uint8_t aa :1; // authoritive answer 122 | uint8_t opcode :4; // purpose of message 123 | uint8_t qr :1; // query/response flag 124 | 125 | uint8_t rcode :4; // response code 126 | uint8_t cd :1; // checking disabled 127 | uint8_t ad :1; // authenticated data 128 | uint8_t z :1; // reserved 129 | uint8_t ra :1; // recursion available 130 | 131 | uint16_t q_count; // number of question entries 132 | uint16_t ans_count; // number of answer entries 133 | uint16_t auth_count; // number of authority entries 134 | uint16_t add_count; // number of resource entries 135 | }; 136 | 137 | struct dns_question 138 | { 139 | uint16_t qtype; 140 | uint16_t qclass; 141 | }; 142 | 143 | struct dns_query 144 | { 145 | char* names; 146 | struct dns_header_detail* header; 147 | struct dns_question* qstn; 148 | int length; 149 | }; 150 | 151 | #pragma pack(push) /* push current alignment to stack */ 152 | #pragma pack(2) 153 | struct dns_answer 154 | { 155 | uint16_t name; 156 | uint16_t atype; 157 | uint16_t aclass; 158 | uint32_t ttl; 159 | uint16_t rdlen; 160 | }; 161 | 162 | struct dns_soa 163 | { 164 | char* mname; 165 | char* rname; 166 | uint32_t serial; 167 | uint32_t refresh; 168 | uint32_t retry; 169 | uint32_t expire; 170 | uint32_t ttl; 171 | }; 172 | 173 | #pragma pack(pop) 174 | 175 | /* functions */ 176 | 177 | 178 | size_t json_to_answer(char*, struct dns_header_detail*, size_t); 179 | 180 | void format(char*, size_t); 181 | 182 | void copy(char* const, const char*, size_t); 183 | 184 | char* getTypeString(uint16_t, int); 185 | 186 | void handle_signal(int); 187 | 188 | void usage(char*); 189 | 190 | int parse_options(); 191 | 192 | int create_pidfile(); 193 | 194 | int remove_spaces(char*); 195 | 196 | void hexdump(char*, void*, int); 197 | 198 | #endif /* DNSSL_H */ 199 | 200 | /* 201 | Notes 202 | ----------------------------------------------------- 203 | TYPE value and meaning 204 | A 1 a host address IPv4 205 | NS 2 an authoritative name server 206 | MD 3 a mail destination (Obsolete - use MX) 207 | MF 4 a mail forwarder (Obsolete - use MX) 208 | CNAME 5 the canonical name for an alias 209 | SOA 6 marks the start of a zone of authority 210 | MB 7 a mailbox domain name (EXPERIMENTAL) 211 | MG 8 a mail group member (EXPERIMENTAL) 212 | MR 9 a mail rename domain name (EXPERIMENTAL) 213 | NULL 10 a null RR (EXPERIMENTAL) 214 | WKS 11 a well known service description 215 | PTR 12 a domain name pointer 216 | HINFO 13 host information 217 | MINFO 14 mailbox or mail list information 218 | MX 15 mail exchange 219 | TXT 16 text strings 220 | AAAA 28 a host address IPv6 221 | 222 | ----------------------------------------------------- 223 | Class value and meaning 224 | IN 1 the Internet 225 | CS 2 the CSNET class (Obsolete - used only for examples in some obsolete RFCs) 226 | CH 3 the CHAOS class 227 | HS 4 Hesiod [Dyer 87] 228 | */ 229 | -------------------------------------------------------------------------------- /inc/log.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (C) 2016 Behrooz Kamary Aliabadi 3 | 4 | * This program is free software: you can redistribute it and/or modify 5 | * it under the terms of the GNU General Public License as published by 6 | * the Free Software Foundation, either version 3 of the License, or 7 | * (at your option) any later version. 8 | 9 | * This program is distributed in the hope that it will be useful, 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 | * GNU General Public License for more details. 13 | 14 | * You should have received a copy of the GNU General Public License 15 | * along with this program. If not, see . 16 | */ 17 | 18 | #ifndef _LOG_H_ 19 | #define _LOG_H_ 20 | 21 | #include 22 | #include 23 | 24 | static inline char* get_timestamp(); 25 | 26 | #define _FILE strrchr(__FILE__, '/') ? strrchr(__FILE__, '/') + 1 : __FILE__ 27 | 28 | #define LEV_NO_DEV_LOG 0x00 29 | #define LEV_EMERGENCY 0x01 30 | #define LEV_ALERT 0x02 31 | #define LEV_CRITICAL 0x03 32 | #define LEV_ERROR 0x04 33 | #define LEV_WARNING 0x05 34 | #define LEV_NOTICE 0x06 35 | #define LEV_INFO 0x07 36 | #define LEV_DEBUG 0x08 37 | 38 | #ifndef LOG_LEVEL 39 | #define LOG_LEVEL LEV_DEBUG 40 | #endif 41 | 42 | #define PRINTLOG(format, ...) fprintf(stderr, format, __VA_ARGS__) 43 | 44 | #define LOG_FMT "[%s] [%s] [%s] [%s:%d] : " 45 | #define LOG_ARGS(LOG_TAG) get_timestamp(), LOG_TAG, _FILE, __FUNCTION__, __LINE__ 46 | 47 | #define CR "\n" 48 | 49 | #define ERROR_TAG "ERROR" 50 | #define WARNING_TAG "WARNING" 51 | #define NOTICE_TAG "NOTICE" 52 | #define INFO_TAG "INFO" 53 | #define DEBUG_TAG "DEBUG" 54 | 55 | #if LOG_LEVEL >= LEV_DEBUG 56 | #define LOG_DEBUG(msg, args...) PRINTLOG(LOG_FMT msg CR, LOG_ARGS(DEBUG_TAG), ## args) 57 | #else 58 | #define LOG_DEBUG(msg, args...) 59 | #endif 60 | 61 | #if LOG_LEVEL >= LEV_INFO 62 | #define LOG_INFO(msg, args...) PRINTLOG(LOG_FMT msg CR, LOG_ARGS(INFO_TAG), ## args) 63 | #else 64 | #define LOG_INFO(msg, args...) 65 | #endif 66 | 67 | #if LOG_LEVEL >= LEV_ERROR 68 | #define LOG_ERROR(msg, args...) PRINTLOG(LOG_FMT msg CR, LOG_ARGS(ERROR_TAG), ## args) 69 | #else 70 | #define LOG_ERROR(msg, args...) 71 | #endif 72 | 73 | 74 | static inline char *get_timestamp() 75 | { 76 | static char buffer[128]; 77 | time_t ttime; 78 | struct tm *timeinfo; 79 | time(&ttime); 80 | timeinfo = localtime(&ttime); 81 | strftime(buffer, sizeof buffer, "%Y-%m-%d %H:%M:%S", timeinfo); 82 | return buffer; 83 | } 84 | 85 | 86 | #endif 87 | -------------------------------------------------------------------------------- /service/dnsd: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | ### BEGIN INIT INFO 3 | # Provides: dnsd 4 | # Required-Start: $local_fs $remote_fs $network $syslog 5 | # Required-Stop: $local_fs $remote_fs $network $syslog 6 | # Should-Start: fam 7 | # Should-Stop: fam 8 | # Default-Start: 2 3 4 5 9 | # Default-Stop: 0 1 6 10 | # Short-Description: Start DNSd, a DNS-over-HTTPS server. 11 | # Description: Fast and small DNS server that delegates 12 | # DNSSEC to a remote server over HTTPS. 13 | # Such a service is currently supported by 14 | # Google which is used by DNSd. 15 | # The user must read and agree to the EULA(s) 16 | # before using this module. The user will be 17 | # the sole responsible for using this module 18 | # and Google DNS-over-HTTPS service(s). 19 | # 20 | ### END INIT INFO 21 | 22 | set -e 23 | 24 | # Source function library. 25 | 26 | DAEMON=/usr/local/bin/dnsd 27 | NAME=dnsd 28 | DESC="DNSd Daemon" 29 | PIDFILE=/var/run/$NAME.pid 30 | SCRIPTNAME=/etc/init.d/$NAME 31 | 32 | DAEMON_OPTS="-f /etc/dnsd.conf" 33 | 34 | test -x $DAEMON || exit 0 35 | 36 | . /lib/lsb/init-functions 37 | 38 | 39 | start() { 40 | log_daemon_msg "Start : " $NAME 41 | 42 | if ! start-stop-daemon --start --oknodo --quiet \ 43 | --pidfile $PIDFILE --exec $DAEMON -- $DAEMON_OPTS 44 | then 45 | log_end_msg 1 46 | else 47 | log_end_msg 0 48 | fi 49 | return 50 | } 51 | 52 | stop() { 53 | log_daemon_msg "Stop : " $NAME 54 | 55 | if start-stop-daemon --stop --retry 30 --oknodo --quiet \ 56 | --pidfile $PIDFILE --exec $DAEMON 57 | then 58 | rm -f $PIDFILE 59 | log_end_msg 0 60 | else 61 | log_end_msg 1 62 | fi 63 | return 64 | } 65 | 66 | case "$1" in 67 | start) 68 | start 69 | ;; 70 | stop) 71 | stop 72 | ;; 73 | status) 74 | status_of_proc -p "$PIDFILE" "$DAEMON" dnsd && exit 0 || exit $? 75 | ;; 76 | restart) 77 | stop 78 | start 79 | ;; 80 | *) 81 | echo "Usage: $SCRIPTNAME {start|stop|status|restart}" >&2 82 | exit 1 83 | ;; 84 | esac 85 | exit $? 86 | -------------------------------------------------------------------------------- /service/dnsd.service: -------------------------------------------------------------------------------- 1 | [Unit] 2 | Description=DNSd Daemon 3 | After=network.target 4 | 5 | [Service] 6 | Type=forking 7 | PIDFile=/var/run/dnsd.pid 8 | ExecStart=/usr/local/bin/dnsd -f /etc/dnsd/dnsd.conf 9 | KillMode=process 10 | Restart=on-failure 11 | 12 | [Install] 13 | WantedBy=multi-user.target 14 | -------------------------------------------------------------------------------- /service/service.dnsd.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | KeepAlive 6 | 7 | Label 8 | service.dnsd 9 | ProgramArguments 10 | 11 | /usr/local/bin/dnsd 12 | -f 13 | /etc/dnsd/dnsd.conf 14 | 15 | RunAtLoad 16 | 17 | StandardErrorPath 18 | /usr/local/var/log/dnsd.error 19 | StandardOutPath 20 | /usr/local/var/log/dnsd.log 21 | 22 | 23 | -------------------------------------------------------------------------------- /src/dnssec.c: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (C) 2016 Behrooz Kamary Aliabadi 3 | 4 | * This program is free software: you can redistribute it and/or modify 5 | * it under the terms of the GNU General Public License as published by 6 | * the Free Software Foundation, either version 3 of the License, or 7 | * (at your option) any later version. 8 | 9 | * This program is distributed in the hope that it will be useful, 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 | * GNU General Public License for more details. 13 | 14 | * You should have received a copy of the GNU General Public License 15 | * along with this program. If not, see . 16 | */ 17 | #define _GNU_SOURCE 18 | #include 19 | #include 20 | #include 21 | #include 22 | #include 23 | #include 24 | #include 25 | #include 26 | #include 27 | #include 28 | #include 29 | #include 30 | #include 31 | #include 32 | #include 33 | #include // umask() 34 | #include 35 | #include 36 | #include 37 | 38 | 39 | sig_atomic_t running = 0; 40 | static int sock; 41 | static int pidfp; 42 | static char* buffer; 43 | static char* data; 44 | static char* json; 45 | static struct sockaddr_storage peer_add; 46 | static socklen_t peer_add_len; 47 | static size_t total_read; 48 | static struct func_options options; 49 | 50 | static void __attribute__ ((unused)) start_daemon() 51 | { 52 | pid_t process_id = 0; 53 | pid_t sid = 0; 54 | process_id = fork(); 55 | if (process_id < 0) 56 | { 57 | fprintf(stderr, "fork() failed.\n"); 58 | exit(EXIT_FAILURE); 59 | } 60 | 61 | if (process_id > 0) 62 | { 63 | fprintf(stdout, "daemon process id is %d. \n", process_id); 64 | exit(EXIT_SUCCESS); 65 | } 66 | 67 | umask(0); 68 | sid = setsid(); 69 | if(sid < 0) 70 | { 71 | fprintf(stderr, "setsid() failed.\n"); 72 | exit(EXIT_FAILURE); 73 | } 74 | 75 | chdir("/"); 76 | 77 | close(STDIN_FILENO); 78 | close(STDOUT_FILENO); 79 | close(STDERR_FILENO); 80 | 81 | if (open("/dev/null", O_RDONLY) == -1) 82 | { 83 | fprintf(stderr, "open(stdin)"); 84 | exit(EXIT_FAILURE); 85 | } 86 | if (open("/dev/null", O_WRONLY) == -1) 87 | { 88 | fprintf(stderr, "open(stdout)"); 89 | exit(EXIT_FAILURE); 90 | } 91 | if (open("/dev/null", O_RDWR) == -1) 92 | { 93 | fprintf(stderr, "open(stderr)"); 94 | exit(EXIT_FAILURE); 95 | } 96 | } 97 | 98 | #if DEBUG_AUDIT_ENABLE 99 | void audit_pid(const char* port) 100 | { 101 | int failed = 1; 102 | FILE* fp; 103 | char buffer[2048]; 104 | 105 | fp = popen("netstat -npau 2>&1", "r"); 106 | if (fp == NULL) 107 | { 108 | LOG_DEBUG("failed to run 'netstat'"); 109 | return; 110 | } 111 | 112 | 113 | while (fgets(buffer, sizeof(buffer), fp) != NULL) 114 | { 115 | char * curLine = buffer; 116 | while(curLine) 117 | { 118 | char * nextLine = strchr(curLine, '\n'); 119 | if (nextLine) *nextLine = '\0'; 120 | if (strstr(curLine, "udp") && strstr(curLine, port)) 121 | { 122 | LOG_DEBUG("%s", curLine); 123 | failed = 0; 124 | } 125 | if (nextLine) *nextLine = '\n'; 126 | curLine = nextLine ? (nextLine + 1) : NULL; 127 | } 128 | } 129 | 130 | if (failed) LOG_DEBUG("PID audit failed."); 131 | 132 | pclose(fp); 133 | } 134 | #endif 135 | 136 | int ipoll() 137 | { 138 | struct pollfd fds; 139 | fds.fd = sock; 140 | fds.events = POLLIN; 141 | 142 | return poll(&fds, 1, 1000); 143 | } 144 | 145 | size_t body_callback (void* contents, size_t size, size_t nmemb, void* userp) 146 | { 147 | size_t chunk = size * nmemb; 148 | strncpy(json + total_read, contents, chunk); 149 | 150 | total_read += chunk; 151 | LOG_DEBUG("read totaly %zu bytes.", total_read); 152 | 153 | return chunk; 154 | } 155 | 156 | int https_query (struct dns_query* query) 157 | { 158 | 159 | CURL* curl; 160 | CURLcode res; 161 | 162 | char query_str[3 * (MAX_DOMAIN_LENGTH + MAX_SUBDOMAIN_LENGTH)] = {0}; 163 | 164 | if (options.server_url[0]) 165 | { 166 | strncpy(query_str, options.server_url, OPT_SERVER_URL_LEN); 167 | } 168 | else 169 | { 170 | strncpy(query_str, OPT_DEFAULT_URL, OPT_SERVER_URL_LEN); 171 | } 172 | 173 | strcat(query_str, "/resolve?name="); 174 | strcat(query_str, query->names); 175 | strcat(query_str, "&type="); 176 | strcat(query_str, getTypeString(ntohs(query->qstn->qtype), FALSE)); 177 | 178 | if (!options.enable_edns) 179 | strcat(query_str, "&edns_client_subnet=0.0.0.0/0"); 180 | 181 | LOG_DEBUG("query : %s", query_str); 182 | 183 | struct curl_slist* headers = NULL; 184 | 185 | curl_global_cleanup(); 186 | curl = curl_easy_init(); 187 | if (!curl) 188 | { 189 | LOG_ERROR("curl_easy_init() failed."); 190 | return EXIT_FAILURE; 191 | } 192 | 193 | curl_easy_setopt(curl, CURLOPT_URL, query_str); 194 | curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); 195 | 196 | // do not check the SSL certificate authenticity 197 | //curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0); 198 | //curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0); 199 | //curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); 200 | 201 | curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1); 202 | curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); 203 | curl_easy_setopt(curl, CURLOPT_TIMEOUT, options.server_timeout); 204 | 205 | if (options.https_proxy[0]) 206 | { 207 | curl_easy_setopt(curl, CURLOPT_PROXY, options.https_proxy); 208 | } 209 | 210 | if (options.service_pub_key[0]) 211 | { 212 | if (curl_easy_setopt(curl, CURLOPT_PINNEDPUBLICKEY, options.service_pub_key) != CURLE_OK) 213 | { 214 | LOG_ERROR("failed to load the pinned public key"); 215 | return EXIT_FAILURE; 216 | } 217 | } 218 | 219 | curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, body_callback); 220 | curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)query); 221 | 222 | total_read = 0; 223 | 224 | res = curl_easy_perform(curl); 225 | 226 | curl_easy_cleanup(curl); 227 | curl_slist_free_all(headers); 228 | LOG_DEBUG("curl_easy_perform() has returned."); 229 | 230 | if (res != CURLE_OK) 231 | { 232 | LOG_ERROR("curl_easy_perform() failed: %s", curl_easy_strerror(res)); 233 | return EXIT_FAILURE; 234 | } 235 | 236 | 237 | return EXIT_SUCCESS; 238 | } 239 | 240 | int server() 241 | { 242 | 243 | struct sockaddr_in server_add; 244 | buffer = malloc(BUFFER_SIZE); 245 | json = malloc(BUFFER_SIZE); 246 | data = malloc(MAX_DOMAIN_LENGTH); 247 | char* names = malloc(MAX_DOMAIN_LENGTH); 248 | 249 | if (buffer == NULL || json == NULL || 250 | data == NULL || names == NULL) return EXIT_FAILURE; 251 | 252 | memset(buffer, 0x00, BUFFER_SIZE); 253 | memset(json, 0x00, BUFFER_SIZE); 254 | memset(data, 0x00, MAX_DOMAIN_LENGTH); 255 | memset(names, 0x00, MAX_DOMAIN_LENGTH); 256 | 257 | server_add.sin_family = AF_INET; 258 | server_add.sin_port = htons(options.service_port); 259 | server_add.sin_addr.s_addr = htonl(INADDR_ANY); 260 | 261 | if (options.service_ip[0] != '\0') 262 | { 263 | if (inet_pton(AF_INET, options.service_ip, &(server_add.sin_addr)) == 1) 264 | { 265 | LOG_INFO("service ip (%s)", options.service_ip); 266 | } 267 | else 268 | { 269 | LOG_ERROR("invalid service ip (%s)", options.service_ip); 270 | } 271 | } 272 | 273 | LOG_DEBUG("service port (%d)", options.service_port); 274 | 275 | sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 276 | if (sock < 0) 277 | { 278 | 279 | #if LOG_LEVEL == LEV_NO_DEV_LOG 280 | perror("socket()"); 281 | #endif 282 | LOG_ERROR("socket() %s", strerror(errno)); 283 | return EXIT_FAILURE; 284 | } 285 | 286 | if (bind(sock, (struct sockaddr*) &server_add, sizeof(server_add))) 287 | { 288 | 289 | #if LOG_LEVEL == LEV_NO_DEV_LOG 290 | perror("bind()"); 291 | #endif 292 | LOG_ERROR("bind() %s", strerror(errno)); 293 | return EXIT_FAILURE; 294 | } 295 | 296 | 297 | while (running) 298 | { 299 | int rp = ipoll(); 300 | 301 | if (rp == 0) continue; 302 | else if (rp < 0) 303 | { 304 | if (running) 305 | { 306 | LOG_ERROR("socket poll failed."); 307 | running = 0; 308 | } 309 | break; 310 | } 311 | 312 | int nread = recvfrom(sock, buffer, BUFFER_SIZE, MSG_WAITALL, (struct sockaddr*)&peer_add, &peer_add_len); 313 | 314 | if (nread < 0) continue; 315 | 316 | char host[NI_MAXHOST], service[NI_MAXSERV], ip[INET6_ADDRSTRLEN]; 317 | 318 | int res = getnameinfo((struct sockaddr *) &peer_add, peer_add_len, host, NI_MAXHOST, service, NI_MAXSERV, NI_NUMERICSERV); 319 | 320 | if (peer_add.ss_family == AF_INET) 321 | { 322 | struct sockaddr_in *p = (struct sockaddr_in *) &peer_add; 323 | inet_ntop(peer_add.ss_family, &(p->sin_addr), ip, sizeof(ip)); 324 | } 325 | else if (peer_add.ss_family == AF_INET6) 326 | { 327 | struct sockaddr_in6 *p = (struct sockaddr_in6 *) &peer_add; 328 | inet_ntop(peer_add.ss_family, &(p->sin6_addr), ip, sizeof(ip)); 329 | } 330 | 331 | if (res == 0) 332 | LOG_DEBUG("received %ld bytes from [%s] [%s:%s]", (long) nread, host, ip, service); 333 | else 334 | LOG_ERROR("getnameinfo() : %s", gai_strerror(res)); 335 | #if DEBUG_AUDIT_ENABLE 336 | audit_pid(service); 337 | #endif 338 | 339 | struct dns_header_detail* header = (struct dns_header_detail*)buffer; 340 | 341 | LOG_DEBUG("number of questions (%u)", ntohs(header->q_count)); 342 | LOG_DEBUG("number of answers (%u)", ntohs(header->ans_count)); 343 | LOG_DEBUG("number of authorities (%u)", ntohs(header->auth_count)); 344 | LOG_DEBUG("number of addtionals (%u)", ntohs(header->add_count)); 345 | 346 | 347 | const char* dn = buffer + sizeof(struct dns_header); 348 | 349 | size_t dnlen = 0; 350 | for (;(dnlen < MAX_DOMAIN_LENGTH && *dn); dnlen++) 351 | { 352 | names[dnlen] = *dn++; 353 | if (names[dnlen] < 0x30) names[dnlen] = '.'; 354 | } 355 | 356 | struct dns_query query; 357 | query.header = header; 358 | query.qstn = (struct dns_question *)(buffer + sizeof(struct dns_header) + dnlen + 1); 359 | query.length = sizeof(struct dns_question) + sizeof(struct dns_header) + dnlen + 1; 360 | 361 | query.names = names; 362 | LOG_DEBUG("Domain Name (%s) length (%zd)", query.names, dnlen); 363 | query.names += (names[0] == '.'?1:0); 364 | 365 | memset(json, 0x00, BUFFER_SIZE); 366 | 367 | size_t answer_length = 0; 368 | size_t max_len = 512; 369 | 370 | if (header->add_count && 371 | *(buffer + query.length) == 0 && 372 | *(uint16_t*)(buffer + query.length + 1) == htons(41)) 373 | { 374 | max_len = ntohs(*(uint16_t*)(buffer + query.length + 3)); 375 | LOG_DEBUG("client supports EDNS0 OPT packet length (%zd).", max_len); 376 | } 377 | 378 | header->qr = 1; // this is a response 379 | header->rcode = 0; 380 | header->ans_count = 0; 381 | header->add_count = 0; // if needed we set EDNS0 OPT later 382 | 383 | 384 | // TODO support multiple questions; however it seems others don't. 385 | if (ntohs(header->q_count) == 1) 386 | { 387 | if (https_query(&query) == EXIT_SUCCESS) 388 | { 389 | char* answer = (char *)(buffer + sizeof(struct dns_question) + sizeof(struct dns_header) + dnlen + 1); 390 | answer_length = json_to_answer(answer, header, max_len); 391 | } 392 | else LOG_ERROR("https_query() failed."); 393 | } 394 | 395 | if (!answer_length || answer_length == JSON_NO_ANSWER) 396 | { 397 | header->rcode = DNS_SERVER_FAILURE; 398 | answer_length = 0; // the returned value may be less than zero to indicate the error code. 399 | LOG_DEBUG ("(%x) DNS SERVER FAILURE", header->id); 400 | } 401 | 402 | 403 | if (sendto(sock, buffer, query.length + answer_length, 0, (struct sockaddr *) &peer_add, peer_add_len) != (query.length + answer_length)) 404 | { 405 | LOG_ERROR("(%x) error sending response.", header->id); 406 | } 407 | else 408 | { 409 | LOG_DEBUG("(%x) %u bytes has been sent to %s:%s.", header->id, (unsigned int)(query.length + answer_length), ip, service); 410 | } 411 | 412 | memset(buffer, 0x00, nread); 413 | memset(names, 0x00, dnlen); 414 | } 415 | 416 | free(buffer); 417 | free(data); 418 | free(names); 419 | free(json); 420 | close(sock); 421 | 422 | return EXIT_SUCCESS; 423 | } 424 | 425 | int main(int argc, char **argv) 426 | { 427 | 428 | memset(&options, 0x00, sizeof(struct func_options)); 429 | 430 | extern char* optarg; 431 | extern int optind; 432 | int c; 433 | 434 | 435 | static struct option long_options[] = 436 | { 437 | {"debug", no_argument, 0, 'D'}, 438 | {"help", no_argument, 0, 'h'}, 439 | {"config", required_argument, 0, 'f'}, 440 | {0, 0, 0, 0} 441 | }; 442 | 443 | int option_index = 0; 444 | 445 | while ((c = getopt_long(argc, argv, "hDf:", long_options, &option_index)) != -1) 446 | { 447 | switch (c) 448 | { 449 | case 'f': 450 | strncpy(options.config_file, optarg, OPT_CONIG_FILE_LEN); 451 | break; 452 | case 'D': 453 | options.enable_debug = 0xFF; 454 | break; 455 | case 'h': 456 | usage(argv[0]); 457 | return EXIT_FAILURE; 458 | default: 459 | usage(argv[0]); 460 | return EXIT_FAILURE; 461 | } 462 | } 463 | 464 | if (options.config_file[0] != '\0' && parse_options() == EXIT_FAILURE) 465 | { 466 | LOG_ERROR("parsing the configuration file has been failed."); 467 | } 468 | 469 | if (options.service_port == 0) options.service_port = DNS_SERVER_PORT; 470 | if (options.server_timeout == 0) options.server_timeout = DNS_SERVER_TIMEOUT; 471 | 472 | peer_add_len = sizeof(struct sockaddr_storage); 473 | running = 1; 474 | 475 | // signal handler initialization 476 | sigset_t sigset; 477 | sigemptyset(&sigset); 478 | sigaddset(&sigset, SIGCHLD); 479 | sigaddset(&sigset, SIGTSTP); 480 | sigaddset(&sigset, SIGTTOU); 481 | sigaddset(&sigset, SIGTTIN); 482 | sigprocmask(SIG_BLOCK, &sigset, NULL); 483 | 484 | struct sigaction sa; 485 | memset (&sa, '\0', sizeof(sa)); 486 | sa.sa_handler = handle_signal; 487 | sigemptyset(&sa.sa_mask); 488 | sa.sa_flags = 0; 489 | 490 | sigaction(SIGHUP, &sa, NULL); 491 | sigaction(SIGUSR1, &sa, NULL); 492 | sigaction(SIGINT, &sa, NULL); 493 | sigaction(SIGTERM, &sa, NULL); 494 | signal(SIGPIPE, SIG_IGN); 495 | 496 | if (options.enable_debug != 0xFF) 497 | { 498 | start_daemon(); 499 | if (create_pidfile() == EXIT_FAILURE) return EXIT_FAILURE; 500 | } 501 | 502 | if (server() == EXIT_FAILURE) 503 | LOG_ERROR ("udp server failed to start."); 504 | 505 | LOG_DEBUG ("Process Terminated."); 506 | 507 | return EXIT_SUCCESS; 508 | } 509 | 510 | 511 | size_t json_to_answer(char* answer, struct dns_header_detail* header, size_t max_len) 512 | { 513 | size_t padd = 0; 514 | char* orig = answer; 515 | memset(data, 0x00, MAX_DOMAIN_LENGTH); 516 | 517 | char* rdata; 518 | 519 | uint16_t type = 0; 520 | char ctype[10] = ""; 521 | 522 | uint32_t ttl = 0; 523 | char cttl[10] = ""; 524 | 525 | if (orig == NULL) return JSON_NULL; 526 | 527 | char* token = strstr(json, "Answer"); 528 | 529 | if (token == NULL) 530 | { 531 | LOG_DEBUG("no 'Answer' was found"); 532 | return JSON_NO_ANSWER; 533 | } 534 | 535 | uint16_t num_answers = 0; 536 | uint16_t num_additionals = 0; 537 | 538 | while ((token = strstr(token, "name"))) 539 | { 540 | 541 | token = strstr(token, "type"); 542 | char* beg = strchr(token, ':') + 1; 543 | size_t len = strchr(beg, ',') - beg; 544 | 545 | memset(ctype, 0x00, 10); 546 | strncpy(ctype, beg, len); 547 | type = atoi(ctype); 548 | 549 | if (type != DNS_A_RECORD && 550 | type != DNS_AAAA_RECORD && 551 | type != DNS_CNAME_RECORD && 552 | type != DNS_NS_RECORD && 553 | type != DNS_MX_RECORD) 554 | { // other types are not supported 555 | continue; 556 | } 557 | else 558 | { 559 | token = beg + len; 560 | } 561 | 562 | LOG_DEBUG ("(%x) Type : %d (%s)", header->id, type, getTypeString(type, TRUE)); 563 | 564 | token = strstr(token, "TTL"); 565 | beg = strchr(beg, ':') + 2; 566 | len = strchr(beg, ',') - beg; 567 | 568 | memset(cttl, 0x00, 10); 569 | strncpy(cttl, beg, len); 570 | ttl = atoi(cttl); 571 | token = beg + len; 572 | 573 | LOG_DEBUG ("(%x) TTL : %d", header->id, ttl); 574 | 575 | size_t offset = (type == DNS_MX_RECORD)?0:1; 576 | 577 | token = strstr(token, "data"); 578 | beg = strchr(token, ':'); 579 | beg = strchr(beg, '\"') + 1; 580 | len = strchr(beg, '\"') - beg; 581 | strncpy(data + offset, beg, len); 582 | token = beg + len; 583 | 584 | LOG_DEBUG("(%x) data : %s", header->id, data + offset); 585 | 586 | 587 | struct dns_answer* ans = (struct dns_answer *)answer; 588 | ans->name = htons(0xc00c); 589 | ans->atype = htons(type); 590 | ans->aclass = htons(0x0001); 591 | ans->ttl = htonl(ttl); 592 | ans->rdlen = 0; 593 | 594 | if (type == DNS_A_RECORD) 595 | { 596 | ans->rdlen = htons(4); 597 | rdata = (char *)(answer + DNS_ANSWER_LEN); 598 | inet_pton(AF_INET, data + offset, rdata); 599 | 600 | // 4 x 3 + 3 = 15 bytes to be erased 601 | memset(data, 0x00, INET_ADDRSTRLEN); 602 | 603 | padd = 4 + DNS_ANSWER_LEN; 604 | } 605 | else if (type == DNS_AAAA_RECORD) 606 | { 607 | ans->rdlen = htons(INET_ADDRSTRLEN); 608 | rdata = (char *)(answer + DNS_ANSWER_LEN); 609 | inet_pton(AF_INET6, data + offset, rdata); 610 | 611 | // maximum string size of an IPv6 address is 45 bytes 612 | memset(data, 0x00, INET6_ADDRSTRLEN); 613 | 614 | padd = INET_ADDRSTRLEN + DNS_ANSWER_LEN; 615 | } 616 | else if (type == DNS_CNAME_RECORD || 617 | type == DNS_NS_RECORD) 618 | { 619 | uint8_t lent = 0; 620 | size_t dot = 0; 621 | 622 | for (unsigned int i = offset; i < len + offset; ++i) 623 | { 624 | if (data[i] != '.') lent++; 625 | else 626 | { 627 | data[dot] = lent; 628 | dot = (uint8_t) i; 629 | lent = 0; 630 | } 631 | } 632 | 633 | 634 | data[len] = 0x00; 635 | ans->rdlen = htons(len + offset); 636 | rdata = (char *)(answer + DNS_ANSWER_LEN); 637 | 638 | memcpy(rdata, data, len + offset); 639 | 640 | memset(data, 0x00, len + offset); 641 | padd = len + offset + DNS_ANSWER_LEN; 642 | 643 | } 644 | else if (type == DNS_MX_RECORD) 645 | { 646 | 647 | rdata = (char *)(answer + DNS_ANSWER_LEN); 648 | 649 | size_t pref_len = 0; 650 | while (data[pref_len] != ' ' && pref_len < MX_PREF_MAX_LEN) pref_len++; 651 | data[pref_len] = '\0'; 652 | uint16_t pref = atoi(data + offset); 653 | 654 | LOG_DEBUG("(%x) MX Preference : %d", header->id, pref); 655 | LOG_DEBUG("(%x) len [%zu] data [%s]", header->id, len, &data[pref_len + 1]); 656 | 657 | ans->rdlen = htons(len - pref_len + sizeof(pref)); 658 | 659 | pref = htons(pref); 660 | memcpy(rdata, (void *)(&pref), sizeof(pref)); 661 | 662 | format(data + pref_len, len - pref_len); 663 | 664 | copy(rdata + sizeof(pref), data + pref_len, len + pref_len); 665 | 666 | memset(data, 0x00, MAX_DOMAIN_LENGTH); 667 | padd = len + DNS_ANSWER_LEN - pref_len + sizeof(pref); 668 | } 669 | else 670 | { 671 | ans->rdlen = htons(len + offset); 672 | rdata = (char *)(answer + DNS_ANSWER_LEN); 673 | strncpy(rdata, data + offset, len + offset); 674 | memset(data, 0x00, len + offset); 675 | padd = len + DNS_ANSWER_LEN + offset; 676 | } 677 | 678 | if ((answer - orig + padd) > max_len) break; 679 | 680 | answer += padd; 681 | 682 | if ((answer - orig) < DNS_MAX_SIZE) 683 | num_answers++; 684 | else 685 | num_additionals++; 686 | } 687 | 688 | header->qr = 1; 689 | header->ans_count = htons(num_answers); 690 | header->add_count = htons(num_additionals); 691 | 692 | return (answer - orig); 693 | } 694 | 695 | 696 | char* getTypeString(uint16_t type, int unknown) 697 | { 698 | switch(type) 699 | { 700 | case DNS_AAAA_RECORD: 701 | return "AAAA"; 702 | break; 703 | case DNS_A_RECORD: 704 | return "A"; 705 | break; 706 | case DNS_CNAME_RECORD: 707 | return "CNAME"; 708 | break; 709 | case DNS_SOA_RECORD: 710 | return "SOA"; 711 | break; 712 | case DNS_NS_RECORD: 713 | return "NS"; 714 | break; 715 | case DNS_MX_RECORD: 716 | return "MX"; 717 | break; 718 | case DNS_OPT_RECORD: 719 | return "OPT"; 720 | break; 721 | case 0xFF: 722 | return "ANY"; 723 | break; 724 | default: 725 | return unknown?"UNKNOWN":"ANY"; 726 | break; 727 | } 728 | 729 | return unknown?"UNKNOWN":"ANY"; 730 | } 731 | 732 | void format(char* name, size_t length) 733 | { 734 | 735 | uint8_t lent = 0; 736 | size_t dot = 0; 737 | 738 | for (unsigned int i = 1; i < length; ++i) 739 | { 740 | if (name[i] != '.') lent++; 741 | else 742 | { 743 | name[dot] = lent; 744 | dot = (uint8_t) i; 745 | lent = 0; 746 | } 747 | } 748 | 749 | 750 | name[length - 1] = '\0'; 751 | } 752 | 753 | void hexdump (char *desc, void *addr, int len) 754 | { 755 | int i; 756 | unsigned char buff[17]; 757 | unsigned char *pc = (unsigned char*)addr; 758 | 759 | if (desc != NULL) 760 | printf ("%s:\n", desc); 761 | 762 | if (len == 0) 763 | { 764 | printf(" ZERO LENGTH\n"); 765 | return; 766 | } 767 | if (len < 0) 768 | { 769 | printf(" NEGATIVE LENGTH: %i\n",len); 770 | return; 771 | } 772 | 773 | // Process every byte in the data. 774 | for (i = 0; i < len; i++) 775 | { 776 | if ((i % 16) == 0) 777 | { 778 | if (i != 0) 779 | printf (" %s\n", buff); 780 | 781 | printf (" %04x ", i); 782 | } 783 | printf (" %02x", pc[i]); 784 | if ((pc[i] < 0x20) || (pc[i] > 0x7e)) 785 | buff[i % 16] = '.'; 786 | else 787 | buff[i % 16] = pc[i]; 788 | buff[(i % 16) + 1] = '\0'; 789 | } 790 | 791 | while ((i % 16) != 0) 792 | { 793 | printf (" "); 794 | i++; 795 | } 796 | 797 | printf (" %s\n", buff); 798 | } 799 | 800 | 801 | void copy(char* const dst,const char* src, size_t length) 802 | { 803 | for (unsigned int indx = 0; indx < length; ++indx) 804 | { 805 | dst[indx] = src[indx]; 806 | } 807 | } 808 | 809 | void handle_signal(int signal) 810 | { 811 | switch (signal) 812 | { 813 | case SIGHUP: 814 | case SIGTERM: 815 | case SIGUSR1: 816 | case SIGINT: 817 | close(pidfp); 818 | running = 0; 819 | default: 820 | return; 821 | } 822 | } 823 | 824 | void usage(char* exec_name) 825 | { 826 | fprintf(stderr, "\n"LICENSE"\n\n"); 827 | fprintf(stderr, "Usage : %s [-D] [-f CONFIG_FILE]\n", exec_name); 828 | fprintf(stderr, " %s [-h|--help] Display this information.\n", exec_name); 829 | } 830 | 831 | int parse_options() 832 | { 833 | FILE *fp = NULL; 834 | char *line = NULL; 835 | size_t len = 0; 836 | ssize_t read = 0; 837 | 838 | options.https_proxy[0] = 0; 839 | options.server_url[0] = 0; 840 | options.server_ip_list[0] = 0; 841 | options.service_ip[0] = 0; 842 | 843 | fp = fopen(options.config_file, "r"); 844 | if (fp == NULL) return EXIT_FAILURE; 845 | 846 | while ((read = getline(&line, &len, fp)) != -1) 847 | { 848 | 849 | // replace the trailing newline characters with the space character 850 | for (size_t indx = 0; indx < read; indx++) 851 | { 852 | if (line[indx] == '\n' || line[indx] == '\r') line[indx] = 0x20; 853 | } 854 | 855 | int shift = remove_spaces(line); 856 | read -= shift; 857 | 858 | // skip too short lines 859 | if (read < 3) continue; 860 | 861 | // skip comment lines 862 | if (line[0] == '#') continue; 863 | 864 | if (strstr(line, OPT_HTTPS_PROXY) != NULL) 865 | { 866 | strncpy(options.https_proxy, line + sizeof(OPT_HTTPS_PROXY), OPT_HTTPS_PROXY_LEN); 867 | } 868 | else if (strstr(line, OPT_SERVER_URL) != NULL) 869 | { 870 | if (line[read - 1] == '/') line[read - 1] = '\0'; 871 | strncpy(options.server_url, line + sizeof(OPT_SERVER_URL), OPT_SERVER_URL_LEN); 872 | } 873 | else if (strstr(line, OPT_SERVICE_PORT) != NULL) 874 | { 875 | options.service_port = atoi(line + sizeof(OPT_SERVICE_PORT)); 876 | } 877 | else if (strstr(line, OPT_SERVICE_IP) != NULL) 878 | { 879 | strncpy(options.service_ip, line + sizeof(OPT_SERVICE_IP), OPT_SERVICE_IP_LEN); 880 | } 881 | else if (strstr(line, OPT_SERVICE_PUB_KEY) != NULL) 882 | { 883 | strncpy(options.service_pub_key, line + sizeof(OPT_SERVICE_PUB_KEY), OPT_CONIG_FILE_LEN); 884 | } 885 | else if (strstr(line, OPT_ENABLE_EDNS) != NULL) 886 | { 887 | if (strcasestr(line, OPT_ENABLE_TRUE) != NULL) options.enable_edns = 1; 888 | } 889 | } 890 | 891 | free(line); 892 | 893 | return EXIT_SUCCESS; 894 | } 895 | 896 | 897 | int create_pidfile() 898 | { 899 | char str[10] = {0}; 900 | 901 | pidfp = open(PIDFILE, O_RDWR|O_CREAT, 0600); 902 | 903 | if (pidfp == -1) return EXIT_FAILURE; 904 | 905 | if (lockf(pidfp, F_TLOCK,0) == -1) return EXIT_FAILURE; 906 | 907 | sprintf(str,"%d\n", getpid()); 908 | 909 | write(pidfp, str, strlen(str)); 910 | 911 | return EXIT_SUCCESS; 912 | } 913 | 914 | int remove_spaces(char* str) 915 | { 916 | if (str == NULL) return 0; 917 | 918 | char* stra = str; 919 | char* strb = str; 920 | int shift = 0; 921 | 922 | do 923 | { 924 | *stra = *strb; 925 | if(*stra != ' ') stra++; 926 | else shift++; 927 | } while(*strb++ != 0); 928 | 929 | return shift; 930 | } 931 | --------------------------------------------------------------------------------