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/* libmpdclient
(c) 2008 Max Kellermann <max@duempel.org>
This project's homepage is: http://www.musicpd.org
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of the Music Player Daemon nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "resolver.h"
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef WIN32
# include <ws2tcpip.h>
# include <winsock.h>
#else
# include <netinet/in.h>
# include <arpa/inet.h>
# include <sys/socket.h>
# include <sys/un.h>
# include <netdb.h>
#endif
#ifndef MPD_NO_GAI
# ifdef AI_ADDRCONFIG
# define MPD_HAVE_GAI
# endif
#endif
struct resolver {
enum {
TYPE_ZERO, TYPE_ONE, TYPE_ANY
} type;
#ifdef MPD_HAVE_GAI
struct addrinfo *ai;
const struct addrinfo *next;
#else
struct sockaddr_in sin;
#endif
struct resolver_address current;
#ifndef WIN32
struct sockaddr_un sun;
#endif
};
struct resolver *
resolver_new(const char *host, int port)
{
struct resolver *resolver;
resolver = malloc(sizeof(*resolver));
if (resolver == NULL)
return NULL;
#ifndef WIN32
if (host[0] == '/') {
size_t path_length = strlen(host);
if (path_length >= sizeof(resolver->sun.sun_path)) {
free(resolver);
return NULL;
}
resolver->sun.sun_family = AF_UNIX;
memcpy(resolver->sun.sun_path, host, path_length + 1);
resolver->current.family = PF_UNIX;
resolver->current.protocol = 0;
resolver->current.addrlen = sizeof(resolver->sun);
resolver->current.addr = (const struct sockaddr *)&resolver->sun;
resolver->type = TYPE_ONE;
} else {
#endif
#ifdef MPD_HAVE_GAI
struct addrinfo hints;
char service[20];
int ret;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_ADDRCONFIG;
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
snprintf(service, sizeof(service), "%d", port);
ret = getaddrinfo(host, service, &hints, &resolver->ai);
if (ret != 0) {
free(resolver);
return NULL;
}
resolver->next = resolver->ai;
resolver->type = TYPE_ANY;
#else
const struct hostent *he;
he = gethostbyname(host);
if (he == NULL) {
free(resolver);
return NULL;
}
if (he->h_addrtype != AF_INET) {
free(resolver);
return NULL;
}
memset(&resolver->sin, 0, sizeof(resolver->sin));
resolver->sin.sin_family = AF_INET;
resolver->sin.sin_port = htons(port);
memcpy((char *)&resolver->sin.sin_addr.s_addr,
(char *)he->h_addr, he->h_length);
resolver->current.family = PF_INET;
resolver->current.protocol = 0;
resolver->current.addrlen = sizeof(resolver->sin);
resolver->current.addr = (const struct sockaddr *)&resolver->sin;
resolver->type = TYPE_ONE;
#endif
#ifndef WIN32
}
#endif
return resolver;
}
void
resolver_free(struct resolver *resolver)
{
#ifdef MPD_HAVE_GAI
if (resolver->type == TYPE_ANY)
freeaddrinfo(resolver->ai);
#endif
free(resolver);
}
const struct resolver_address *
resolver_next(struct resolver *resolver)
{
if (resolver->type == TYPE_ZERO)
return NULL;
if (resolver->type == TYPE_ONE) {
resolver->type = TYPE_ZERO;
return &resolver->current;
}
#ifdef MPD_HAVE_GAI
if (resolver->next == NULL)
return NULL;
resolver->current.family = resolver->next->ai_family;
resolver->current.protocol = resolver->next->ai_protocol;
resolver->current.addrlen = resolver->next->ai_addrlen;
resolver->current.addr = resolver->next->ai_addr;
resolver->next = resolver->next->ai_next;
return &resolver->current;
#else
return NULL;
#endif
}
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