skeleton
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#include <stdlib.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#include <err.h>
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#include <netdb.h>
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int main(void){
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struct sockaddr sock;
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socklen_t slen = sizeof(sock);
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char host[1024] = "";
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char port[1044] = "";
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int status;
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if(getpeername(0, &sock, &slen))
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err(1, "getpeername");
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status = getnameinfo(&sock, slen, host, sizeof host, port, sizeof port,
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NI_NUMERICHOST|NI_NUMERICSERV);
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if(status > 0)
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{
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fprintf(stderr, "getnameinfo error");
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exit(1);
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}
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switch(sock. sa_family)
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{
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case AF_INET:
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printf("%s\n", host);
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break;
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case AF_INET6:
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printf("%s\n", host);
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break;
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default:
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puts("run from console");
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}
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}
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