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1b4c14edba
IPv6 nameservers can be significantly longer than 16 characters in length. For example, `2001:0db8:85a3:0000:0000:8a2e:0370:7334` is 39 characters long, and certain syntax elements (e.g. zone indices) can make them even longer. This patch allows up to 256 characters for the nameserver, which is large enough to contain the maximum length of any hostname (~253 ASCII characters), and definitely enough for any IPv4 or IPv6 address.
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/*
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* Copyright (c) 2006-2014 Erik Ekman <yarrick@kryo.se>,
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* 2006-2009 Bjorn Andersson <flex@kryo.se>
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*
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* Permission to use, copy, modify, and/or 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 <stdio.h>
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#include "common.h"
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#include "util.h"
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char *get_resolvconf_addr(void)
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{
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static char addr[257];
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char *rv = NULL;
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#ifndef WINDOWS32
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char buf[257];
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FILE *fp;
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#ifdef ANDROID
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fp = popen("getprop net.dns1", "r");
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if (fp == NULL)
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err(1, "getprop net.dns1 failed");
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if (fgets(buf, sizeof(buf), fp) == NULL)
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err(1, "read getprop net.dns1 failed");
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if (sscanf(buf, "%256s", addr) == 1)
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rv = addr;
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pclose(fp);
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#else
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if ((fp = fopen("/etc/resolv.conf", "r")) == NULL)
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err(1, "/etc/resolv.conf");
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while (feof(fp) == 0) {
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fgets(buf, sizeof(buf), fp);
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if (sscanf(buf, "nameserver %256s", addr) == 1) {
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rv = addr;
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break;
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}
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}
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fclose(fp);
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#endif
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#else /* !WINDOWS32 */
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FIXED_INFO *fixed_info;
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ULONG buflen;
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DWORD ret;
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fixed_info = malloc(sizeof(FIXED_INFO));
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buflen = sizeof(FIXED_INFO);
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if (GetNetworkParams(fixed_info, &buflen) == ERROR_BUFFER_OVERFLOW) {
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/* official ugly api workaround */
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free(fixed_info);
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fixed_info = malloc(buflen);
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}
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ret = GetNetworkParams(fixed_info, &buflen);
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if (ret == NO_ERROR) {
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strncpy(addr, fixed_info->DnsServerList.IpAddress.String, sizeof(addr));
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addr[15] = 0;
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rv = addr;
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}
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free(fixed_info);
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#endif
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return rv;
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}
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#ifdef OPENBSD
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void
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socket_setrtable(int fd, int rtable)
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{
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#ifdef SO_RTABLE
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if (setsockopt (fd, IPPROTO_IP, SO_RTABLE, &rtable, sizeof(rtable)) == -1)
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err(1, "Failed to set routing table %d", rtable);
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#else
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fprintf(stderr, "Routing domain support was not available at compile time.\n");
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#endif
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}
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#endif
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