diff options
Diffstat (limited to 'src/resolver.c')
| -rw-r--r-- | src/resolver.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/src/resolver.c b/src/resolver.c new file mode 100644 index 000000000..5d8d299c6 --- /dev/null +++ b/src/resolver.c @@ -0,0 +1,141 @@ +/* + * Copyright (C) 2003-2011 The Music Player Daemon Project + * http://www.musicpd.org + * + * 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 "resolver.h" +#include "glib_compat.h" + +#ifndef G_OS_WIN32 +#include <sys/socket.h> +#include <netdb.h> +#else /* G_OS_WIN32 */ +#include <ws2tcpip.h> +#include <winsock.h> +#endif /* G_OS_WIN32 */ + +#include <string.h> + +char * +sockaddr_to_string(const struct sockaddr *sa, size_t length, GError **error) +{ +#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED) + const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *)sa; + struct sockaddr_in a4; +#endif + int ret; + char host[NI_MAXHOST], serv[NI_MAXSERV]; + +#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED) + if (sa->sa_family == AF_INET6 && + IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr)) { + /* convert "::ffff:127.0.0.1" to "127.0.0.1" */ + + memset(&a4, 0, sizeof(a4)); + a4.sin_family = AF_INET; + memcpy(&a4.sin_addr, ((const char *)&a6->sin6_addr) + 12, + sizeof(a4.sin_addr)); + a4.sin_port = a6->sin6_port; + + sa = (const struct sockaddr *)&a4; + length = sizeof(a4); + } +#endif + + ret = getnameinfo(sa, length, host, sizeof(host), serv, sizeof(serv), + NI_NUMERICHOST|NI_NUMERICSERV); + if (ret != 0) { + g_set_error(error, g_quark_from_static_string("netdb"), ret, + "%s", gai_strerror(ret)); + return NULL; + } + +#ifdef HAVE_UN + if (sa->sa_family == AF_UNIX) + /* "serv" contains corrupt information with unix + sockets */ + return g_strdup(host); +#endif + +#ifdef HAVE_IPV6 + if (strchr(host, ':') != NULL) + return g_strconcat("[", host, "]:", serv, NULL); +#endif + + return g_strconcat(host, ":", serv, NULL); +} + +struct addrinfo * +resolve_host_port(const char *host_port, unsigned default_port, + int flags, int socktype, + GError **error_r) +{ + char *p = g_strdup(host_port); + const char *host = p, *port = NULL; + + if (host_port[0] == '[') { + /* IPv6 needs enclosing square braces, to + differentiate between IP colons and the port + separator */ + + char *q = strchr(p + 1, ']'); + if (q != NULL && q[1] == ':' && q[2] != 0) { + *q = 0; + ++host; + port = q + 2; + } + } + + if (port == NULL) { + /* port is after the colon, but only if it's the only + colon (don't split IPv6 addresses) */ + + char *q = strchr(p, ':'); + if (q != NULL && q[1] != 0 && strchr(q + 1, ':') == NULL) { + *q = 0; + port = q + 1; + } + } + + char buffer[32]; + if (port == NULL && default_port != 0) { + g_snprintf(buffer, sizeof(buffer), "%u", default_port); + port = buffer; + } + + if ((flags & AI_PASSIVE) != 0 && strcmp(host, "*") == 0) + host = NULL; + + const struct addrinfo hints = { + .ai_flags = flags, + .ai_family = AF_UNSPEC, + .ai_socktype = socktype, + }; + + struct addrinfo *ai; + int ret = getaddrinfo(host, port, &hints, &ai); + g_free(p); + if (ret != 0) { + g_set_error(error_r, resolver_quark(), ret, + "Failed to look up '%s': %s", + host_port, gai_strerror(ret)); + return NULL; + } + + return ai; +} |