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89 lines
2.6 KiB
89 lines
2.6 KiB
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "private-lib-core.h"
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lws_async_dns_server_check_t
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lws_plat_asyncdns_init(struct lws_context *context, lws_sockaddr46 *sa46)
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{
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lws_async_dns_server_check_t s = LADNS_CONF_SERVER_CHANGED;
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char resolv[512], ads[48];
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lws_sockaddr46 sa46t;
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lws_tokenize_t ts;
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int fd, n, ns = 0;
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/* grab the first chunk of /etc/resolv.conf */
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fd = open("/etc/resolv.conf", LWS_O_RDONLY);
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if (fd < 0)
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return LADNS_CONF_SERVER_UNKNOWN;
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n = read(fd, resolv, sizeof(resolv) - 1);
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close(fd);
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if (n < 0)
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return LADNS_CONF_SERVER_UNKNOWN;
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resolv[n] = '\0';
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lws_tokenize_init(&ts, resolv, LWS_TOKENIZE_F_DOT_NONTERM |
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LWS_TOKENIZE_F_NO_FLOATS |
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LWS_TOKENIZE_F_NO_INTEGERS |
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LWS_TOKENIZE_F_MINUS_NONTERM |
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LWS_TOKENIZE_F_HASH_COMMENT);
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do {
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ts.e = lws_tokenize(&ts);
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if (ts.e != LWS_TOKZE_TOKEN) {
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ns = 0;
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continue;
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}
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if (!ns && !strncmp("nameserver", ts.token, ts.token_len)) {
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ns = 1;
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continue;
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}
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if (!ns)
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continue;
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/* we are a token just after the "nameserver" token */
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ns = 0;
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if (ts.token_len > (int)sizeof(ads) - 1)
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continue;
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memcpy(ads, ts.token, ts.token_len);
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ads[ts.token_len] = '\0';
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if (lws_sa46_parse_numeric_address(ads, &sa46t) < 0)
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continue;
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if (!lws_sa46_compare_ads(sa46, &sa46t))
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s = LADNS_CONF_SERVER_SAME;
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*sa46 = sa46t;
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return s;
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} while (ts.e > 0);
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return LADNS_CONF_SERVER_UNKNOWN;
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}
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