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/*
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whichport - Which TCP/UDP port number is associated with an application protocol
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Copyright (C) 2021 Pekka Helenius <pekka.helenius@fjordtek.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stddef.h>
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#include <netdb.h>
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int main(int argc, char *argv[])
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{
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struct servent *se;
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if (argc != 3) {
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printf("%s usage: <protocol> [tcp|udp]\n", argv[0]);
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return 1;
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}
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if ((se = getservbyname(argv[1], argv[2])) == NULL) {
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return 1;
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} else {
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printf("%d\n", ntohs(se->s_port));
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}
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return 0;
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}
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