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/*
http-host.c - thread-safe host lookup
Copyright (C) 2008 siliconforks.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include "http-server.h"
#include "util.h"
int xgethostbyname(const char * host, struct in_addr * a) {
#if defined(__CYGWIN__) || defined(__MINGW32__)
/* gethostbyname is thread-safe */
struct hostent * p = gethostbyname(host);
if (p == NULL || p->h_addrtype != AF_INET) {
return -1;
}
*a = *((struct in_addr *) p->h_addr);
return 0;
#elif HAVE_GETADDRINFO
struct addrinfo hints;
hints.ai_flags = 0;
hints.ai_family = PF_INET;
hints.ai_socktype = 0;
hints.ai_protocol = 0;
hints.ai_addrlen = 0;
hints.ai_addr = NULL;
hints.ai_canonname = NULL;
hints.ai_next = NULL;
struct addrinfo * p;
int result = getaddrinfo(host, NULL, &hints, &p);
if (result != 0 || p == NULL) {
return -1;
}
if (p->ai_family != PF_INET) {
freeaddrinfo(p);
return -1;
}
struct sockaddr_in * address_and_port = (struct sockaddr_in *) p->ai_addr;
*a = address_and_port->sin_addr;
freeaddrinfo(p);
return 0;
#elif HAVE_GETHOSTBYNAME_R
struct hostent h;
struct hostent * p;
char * buffer;
size_t buffer_size;
int error;
int result;
buffer_size = 1024;
buffer = xmalloc(buffer_size);
while ((result = gethostbyname_r(host, &h, buffer, buffer_size, &p, &error)) == ERANGE) {
buffer_size = mulst(buffer_size, 2);
buffer = xrealloc(buffer, buffer_size);
}
if (result != 0 || p == NULL || p->h_addrtype != AF_INET) {
free(buffer);
return -1;
}
*a = *((struct in_addr *) p->h_addr);
free(buffer);
return 0;
#else
#error "No thread-safe host lookup available"
#endif
}
#ifndef HAVE_INET_ATON
int inet_aton(const char * name, struct in_addr * a) {
unsigned long result = inet_addr(name);
if (result == INADDR_NONE) {
return 0;
}
else {
a->s_addr = result;
return 1;
}
}
#endif
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