mirror of https://github.com/ericonr/avahi-dns.git
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/*
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* read-avahi.c
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*
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* Read avahi-browse output and create a config file for a local
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* DNS server. Requires avahi-browse(1) and a running Avahi daemon.
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*
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* Output is hardcoded:
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* - dns.conf for unbound.conf(5)
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* - hosts for a hosts(5)
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*
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* Copyright (c) 2021 Érico Nogueira
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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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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int main()
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{
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/* unbound config file */
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FILE *fu = fopen("dns.conf", "w");
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if (!fu) return 1;
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/* hosts */
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FILE *fh = fopen("hosts", "w");
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if (!fu) return 1;
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FILE *p = popen("avahi-browse --all --resolve --no-db-lookup --parsable --terminate", "re");
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if (!p) return 1;
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char *line = 0;
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size_t n;
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while (getline(&line, &n, p) > 0) {
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/* not resolved */
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if (line[0] != '=') continue;
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int ipv6 = -1;
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char *name=0, *ip=0;
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char *sp, *s, *liner = line;
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for (int i=0; s = strtok_r(liner, ";", &sp); i++, liner=0) {
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switch (i) {
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case 2:
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if (strcmp(s, "IPv4") == 0) ipv6 = 0;
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else if (strcmp(s, "IPv6") == 0) ipv6 = 1;
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break;
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case 6:
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name = s;
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break;
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case 7:
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ip = s;
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break;
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}
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}
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/* failed to find the wanted info */
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if (!(ipv6>=0 && name && ip)) continue;
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char *type = ipv6 ? "AAAA" : "A";
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fprintf(fu, "local-data: \"%s. IN %s %s\"\n", name, type, ip);
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fprintf(fh, "%s %s\n", ip, name);
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}
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free(line);
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fclose(fu);
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fclose(fh);
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pclose(p);
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return 0;
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}
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