#include "nfsrpc.h"
#include "network.h"
-/*
- * Earlier versions of glibc's /usr/include/netdb.h exclude these
- * definitions because it was thought they were not part of a stable
- * POSIX standard. However, they are defined by RFC 2553 and 3493
- * and in POSIX 1003.1-2001, so these definitions were added in later
- * versions of netdb.h.
- */
-#ifndef AI_V4MAPPED
-#define AI_V4MAPPED 0x0008 /* IPv4-mapped addresses are acceptable. */
-#endif /* AI_V4MAPPED */
-#ifndef AI_ALL
-#define AI_ALL 0x0010 /* Return both IPv4 and IPv6 addresses. */
-#endif /* AI_ALL */
-#ifndef AI_ADDRCONFIG
-#define AI_ADDRCONFIG 0x0020 /* Use configuration of this host to choose \
- returned address type. */
-#endif /* AI_ADDRCONFIG */
-
#define PMAP_TIMEOUT (10)
#define CONNECT_TIMEOUT (20)
#define MOUNT_TIMEOUT (30)
}
}
+#ifdef HAVE_DECL_AI_ADDRCONFIG
/**
* nfs_name_to_address - resolve hostname to an IPv4 or IPv6 socket address
* @hostname: pointer to C string containing DNS hostname to resolve
freeaddrinfo(gai_results);
return ret;
}
+#else /* HAVE_DECL_AI_ADDRCONFIG */
+/**
+ * nfs_name_to_address - resolve hostname to an IPv4 socket address
+ * @hostname: pointer to C string containing DNS hostname to resolve
+ * @af_hint: hint to restrict resolution to one address family
+ * @sap: pointer to buffer to fill with socket address
+ * @len: IN: size of buffer to fill; OUT: size of socket address
+ *
+ * Returns 1 and places a socket address at @sap if successful;
+ * otherwise zero.
+ *
+ * Some older getaddrinfo(3) implementations don't support
+ * AI_ADDRCONFIG or AI_V4MAPPED properly. For those cases, a DNS
+ * resolver based on the traditional gethostbyname(3) is provided.
+ */
+int nfs_name_to_address(const char *hostname,
+ const sa_family_t af_hint,
+ struct sockaddr *sap, socklen_t *salen)
+{
+ struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+ socklen_t len = *salen;
+ struct hostent *hp;
+
+ *salen = 0;
+
+ if (af_hint != AF_INET) {
+ nfs_error(_("%s: address family not supported by DNS resolver\n"),
+ progname, hostname);
+ return 0;
+ }
+
+ sin->sin_family = AF_INET;
+ if (inet_aton(hostname, &sin->sin_addr)) {
+ *salen = sizeof(*sin);
+ return 1;
+ }
+
+ hp = gethostbyname(hostname);
+ if (hp == NULL) {
+ nfs_error(_("%s: DNS resolution failed for %s: %s"),
+ progname, hostname, hstrerror(h_errno));
+ return 0;
+ }
+
+ if (hp->h_length > len) {
+ nfs_error(_("%s: DNS resolution results too long for buffer\n"),
+ progname);
+ return 0;
+ }
+
+ memcpy(&sin->sin_addr, hp->h_addr, hp->h_length);
+ *salen = hp->h_length;
+ return 1;
+}
+#endif /* HAVE_DECL_AI_ADDRCONFIG */
/**
* nfs_gethostbyname - resolve a hostname to an IPv4 address