110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
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/*
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* Copyright (c) 2016 Jonas 'Sortie' Termansen.
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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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* getaddrinfo.c
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* Wrapper program for getaddrinfo(3).
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*/
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <err.h>
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#include <netdb.h>
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#include <netinet/in.h>
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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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static void compact_arguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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{
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while ( i < *argc && !(*argv)[i] )
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{
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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}
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int main(int argc, char* argv[])
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{
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const char* argv0 = argv[0];
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' || !arg[1] )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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{
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char c;
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while ( (c = *++arg) ) switch ( c )
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{
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
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exit(1);
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}
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}
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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exit(1);
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}
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}
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compact_arguments(&argc, &argv);
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if ( argc < 2 )
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errx(1, "No host given");
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const char* host = argv[1];
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if ( 3 < argc )
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errx(1, "Unexpected extra operand `%s'", argv[3]);
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const char* service = argv[2];
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struct addrinfo* res = NULL;
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int status = getaddrinfo(host, service, NULL, &res);
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if ( status == EAI_SYSTEM )
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err(1, "%s", host);
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if ( status )
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errx(1, "%s: %s", host, gai_strerror(status));
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for ( struct addrinfo* iter = res; iter; iter = iter->ai_next )
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{
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// TODO: Implement and use getnameinfo(3).
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if ( iter->ai_family == AF_INET )
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{
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struct sockaddr_in* sin = (struct sockaddr_in*) iter->ai_addr;
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char str[INET_ADDRSTRLEN];
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inet_ntop(iter->ai_family, &sin->sin_addr, str, sizeof(str));
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printf("%s\n", str);
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}
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else if ( iter->ai_family == AF_INET6 )
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{
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struct sockaddr_in6* sin6 = (struct sockaddr_in6*) iter->ai_addr;
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char str[INET6_ADDRSTRLEN];
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inet_ntop(iter->ai_family, &sin6->sin6_addr, str, sizeof(str));
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printf("%s\n", str);
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}
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else
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printf("(unknown address family %i)\n", iter->ai_family);
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}
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freeaddrinfo(res);
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return 0;
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}
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