93 lines
4.2 KiB
C
93 lines
4.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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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; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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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, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/safemacros.h"
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#include "libc/calls/calls.h"
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#include "libc/conv/conv.h"
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#include "libc/dns/dns.h"
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#include "libc/dns/hoststxt.h"
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#include "libc/dns/resolvconf.h"
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#include "libc/mem/mem.h"
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#include "libc/sock/sock.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/af.h"
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#include "libc/sysv/consts/ai.h"
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#include "libc/sysv/consts/eai.h"
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#include "libc/sysv/consts/inaddr.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Resolves address for internet name.
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*
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* @param name is either an ip string or a utf-8 hostname
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* @param service is the port number as a string
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* @param hints may be passed to specialize behavior (optional)
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* @param res receives a pointer that must be freed with freeaddrinfo(),
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* and won't be modified if -1 is returned
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* @return 0 on success or EAI_xxx value
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*/
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int getaddrinfo(const char *name, const char *service,
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const struct addrinfo *hints, struct addrinfo **res) {
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int rc, port;
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const char *canon;
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struct addrinfo *ai;
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port = 0;
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if (!name && !service) return EAI_NONAME;
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if (service && (port = parseport(service)) == -1) return EAI_NONAME;
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if (!name && (hints->ai_flags & AI_CANONNAME)) return EAI_BADFLAGS;
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if (!(ai = newaddrinfo(port))) return EAI_MEMORY;
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if (service) ai->ai_addr4->sin_port = htons(port);
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if (hints) {
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ai->ai_socktype = hints->ai_socktype;
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ai->ai_protocol = hints->ai_protocol;
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}
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if (!name) {
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ai->ai_addr4->sin_addr.s_addr =
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(hints && (hints->ai_flags & AI_PASSIVE) == AI_PASSIVE)
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? INADDR_ANY
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: INADDR_LOOPBACK;
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return 0;
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}
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if (inet_pton(AF_INET, name, &ai->ai_addr4->sin_addr.s_addr) == 1) {
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*res = ai;
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return 0;
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} else if (hints && (hints->ai_flags & AI_NUMERICHOST) == AI_NUMERICHOST) {
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freeaddrinfo(ai);
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return EAI_NONAME;
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} else if (resolvehoststxt(gethoststxt(), AF_INET, name, ai->ai_addr,
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sizeof(ai->ai_addr4), &canon) > 0) {
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memcpy(ai->ai_canonname, canon, min(strlen(canon), DNS_NAME_MAX) + 1);
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*res = ai;
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return 0;
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} else {
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rc = resolvedns(getresolvconf(), AF_INET, name, ai->ai_addr,
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sizeof(ai->ai_addr4));
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if (rc > 0) {
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*res = ai;
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return 0;
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}
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freeaddrinfo(ai);
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if (rc == 0) {
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return EAI_NONAME;
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} else {
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return EAI_SYSTEM;
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}
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}
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}
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