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86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
/*
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* Copyright (c) 2006
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* Bjorn Andersson <flex@kryo.se>,
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* Erik Ekman <yarrick@kryo.se>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <netdb.h>
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#include <time.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <ctype.h>
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#include "dns.h"
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struct sockaddr_in peer;
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int
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open_dns()
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{
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int fd;
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int flag;
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struct sockaddr_in addr;
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bzero(&addr, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = 0; // choose an available port
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addr.sin_addr.s_addr = INADDR_ANY; // listen on 0.0.0.0
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fd = socket(AF_INET, SOCK_DGRAM, 0);
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if(fd < 0) {
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err(1, "Could not get UDP socket");
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}
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flag = 1;
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#ifdef SO_REUSEPORT
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setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &flag, sizeof(flag));
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#endif
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(flag));
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if(bind(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
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err(1, "Could not bind UDP socket locally");
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}
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printf("Opened UDP socket\n");
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return fd;
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}
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void
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close_dns(int fd)
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{
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close(fd);
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}
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void
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dns_set_peer(const char *host)
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{
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struct hostent *h;
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h = gethostbyname(host);
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bzero(&peer, sizeof(peer));
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peer.sin_family = AF_INET;
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peer.sin_port = htons(53);
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peer.sin_addr = *((struct in_addr *) h->h_addr);
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}
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