/* 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 }