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https://gitlab.com/sortix/sortix.git
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80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/*
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* Copyright (c) 2013, 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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* netdb/getnameinfo.c
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* Address-to-name translation in protocol-independent manner.
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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 <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 <stdlib.h>
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#include <string.h>
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int getnameinfo(const struct sockaddr* restrict sa,
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socklen_t salen,
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char* restrict host,
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socklen_t hostlen,
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char* restrict serv,
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socklen_t servlen,
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int flags)
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{
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if ( flags & ~(NI_NOFQDN | NI_NUMERICHOST | NI_NAMEREQD | NI_NUMERICSERV |
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NI_NUMERICSCOPE | NI_DGRAM) )
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return EAI_BADFLAGS;
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int af;
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if ( salen == sizeof(struct sockaddr_in) &&
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((struct sockaddr_in*) sa)->sin_family == AF_INET )
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af = AF_INET;
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else if ( salen == sizeof(struct sockaddr_in6) &&
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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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