Add getnameinfo(3).
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5de36cf449
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@ -1,5 +1,5 @@
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/*
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/*
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* Copyright (c) 2013 Jonas 'Sortie' Termansen.
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* Copyright (c) 2013, 2016 Jonas 'Sortie' Termansen.
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*
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*
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* Permission to use, copy, modify, and distribute this software for any
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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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* purpose with or without fee is hereby granted, provided that the above
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@ -17,10 +17,16 @@
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* Address-to-name translation in protocol-independent manner.
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* Address-to-name translation in protocol-independent manner.
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*/
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*/
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#include <netdb.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <endian.h>
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#include <errno.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 <stdio.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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int getnameinfo(const struct sockaddr* restrict sa,
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int getnameinfo(const struct sockaddr* restrict sa,
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socklen_t salen,
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socklen_t salen,
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@ -30,13 +36,45 @@ int getnameinfo(const struct sockaddr* restrict sa,
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socklen_t servlen,
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socklen_t servlen,
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int flags)
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int flags)
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{
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{
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(void) sa;
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if ( flags & ~(NI_NOFQDN | NI_NUMERICHOST | NI_NAMEREQD | NI_NUMERICSERV |
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(void) salen;
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NI_NUMERICSCOPE | NI_DGRAM) )
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(void) host;
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return EAI_BADFLAGS;
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(void) hostlen;
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int af;
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(void) serv;
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if ( salen == sizeof(struct sockaddr_in) &&
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(void) servlen;
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((struct sockaddr_in*) sa)->sin_family == AF_INET )
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(void) flags;
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af = AF_INET;
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fprintf(stderr, "%s is not implemented, aborting.\n", __func__);
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else if ( salen == sizeof(struct sockaddr_in6) &&
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abort();
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((struct sockaddr_in6*) sa)->sin6_family == AF_INET6 )
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af = AF_INET6;
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else
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return EAI_FAMILY;
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if ( !host && !serv )
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return EAI_NONAME;
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if ( host )
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{
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if ( flags & NI_NAMEREQD )
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return EAI_NONAME;
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const void* addr;
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if ( af == AF_INET )
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addr = &(((struct sockaddr_in*) sa)->sin_addr);
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else if ( af == AF_INET6 )
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addr = &(((struct sockaddr_in6*) sa)->sin6_addr);
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else
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return EAI_FAMILY;
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if ( !inet_ntop(af, addr, host, hostlen) )
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return errno == ENOSPC ? EAI_OVERFLOW : EAI_NONAME;
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}
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if ( serv )
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{
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in_port_t port;
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if ( af == AF_INET )
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port = be16toh(((struct sockaddr_in*) sa)->sin_port);
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else if ( af == AF_INET6 )
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port = be16toh(((struct sockaddr_in6*) sa)->sin6_port);
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else
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return EAI_FAMILY;
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if ( servlen <= (size_t) snprintf(serv, servlen, "%u", port) )
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return EAI_OVERFLOW;
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}
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return 0;
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}
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}
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