[PATCH 03/14] mount command: Add functions to manage addresses in string form

Chuck Lever
2008-07-11T20:35:32Z

Introduce two new functions to convert a sockaddr to a presentation format
string and back.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---

utils/mount/network.c | 92 +++++++++++++++++++++++++++++++++++++++++++++++++
utils/mount/network.h | 4 ++
2 files changed, 96 insertions(+), 0 deletions(-)

diff --git a/utils/mount/network.c b/utils/mount/network.c
index c9fd548..3f2721b 100644
--- a/utils/mount/network.c
+++ b/utils/mount/network.c
@@ -215,6 +215,98 @@ int nfs_gethostbyname(const char *hostname, struct sockaddr_in *sin)
(struct sockaddr *)sin, &len);
}

+/**
+ * nfs_string_to_sockaddr - convert string address to sockaddr
+ * @address: pointer to presentation format address to convert
+ * @addrlen: length of presentation address
+ * @sap: pointer to socket address buffer to fill in
+ * @salen: IN: length of address buffer
+ * OUT: length of converted socket address
+ *
+ * Convert a presentation format address string to a socket address.
+ * Similar to nfs_name_to_address(), but the DNS query is squelched,
+ * and won't make any noise if the getaddrinfo() call fails.
+ *
+ * Returns 1 and fills in @sap and @salen if successful; otherwise zero.
+ *
+ * See RFC 4038 section 5.1 or RFC 3513 section 2.2 for more details
+ * on presenting IPv6 addresses as text strings.
+ */
+int nfs_string_to_sockaddr(const char *address, const size_t addrlen,
+ struct sockaddr *sap, socklen_t *salen)
+{
+ struct addrinfo *gai_results;
+ struct addrinfo gai_hint = {
+ .ai_flags = AI_NUMERICHOST,
+ };
+ socklen_t len = *salen;
+ int ret = 0;
+
+ *salen = 0;
+
+ if (getaddrinfo(address, NULL, &gai_hint, &gai_results) == 0) {
+ switch (gai_results->ai_addr->sa_family) {
+ case AF_INET:
+ case AF_INET6:
+ if (len >= gai_results->ai_addrlen) {
+ *salen = gai_results->ai_addrlen;
+ memcpy(sap, gai_results->ai_addr, *salen);
+ ret = 1;
+ }
+ break;
+ }
+ freeaddrinfo(gai_results);
+ }
+
+ return ret;
+}
+
+/**
+ * nfs_present_sockaddr - convert sockaddr to string
+ * @sap: pointer to socket address to convert
+ * @salen: length of socket address
+ * @buf: pointer to buffer to fill in
+ * @buflen: length of buffer
+ *
+ * Convert the passed-in sockaddr-style address to presentation format.
+ * The presentation format address is placed in @buf and is
+ * '\0'-terminated.
+ *
+ * Returns 1 if successful; otherwise zero.
+ *
+ * See RFC 4038 section 5.1 or RFC 3513 section 2.2 for more details
+ * on presenting IPv6 addresses as text strings.
+ */
+int nfs_present_sockaddr(const struct sockaddr *sap, const socklen_t salen,
+ char *buf, const size_t buflen)
+{
+#ifdef HAVE_GETNAMEINFO
+ int result;
+
+ result = getnameinfo(sap, salen, buf, buflen,
+ NULL, 0, NI_NUMERICHOST);
+ if (!result)
+ return 1;
+
+ nfs_error(_("%s: invalid server address: %s"), progname,
+ gai_strerror(result));
+ return 0;
+#else /* HAVE_GETNAMEINFO */
+ char *addr;
+
+ if (sap->sa_family == AF_INET) {
+ addr = inet_ntoa(((struct sockaddr_in *)sap)->sin_addr);
+ if (addr && strlen(addr) < buflen) {
+ strcpy(buf, addr);
+ return 1;
+ }
+ }
+
+ nfs_error(_("%s: invalid server address"), progname);
+ return 0;
+#endif /* HAVE_GETNAMEINFO */
+}
+
/*
* Attempt to connect a socket, but time out after "timeout" seconds.
*
diff --git a/utils/mount/network.h b/utils/mount/network.h
index 9de13b5..8da7e20 100644
--- a/utils/mount/network.h
+++ b/utils/mount/network.h
@@ -53,6 +53,10 @@ int probe_bothports(clnt_addr_t *, clnt_addr_t *);
int nfs_gethostbyname(const char *, struct sockaddr_in *);
int nfs_name_to_address(const char *, const sa_family_t,
struct sockaddr *, socklen_t *);
+int nfs_string_to_sockaddr(const char *, const size_t,
+ struct sockaddr *, socklen_t *);
+int nfs_present_sockaddr(const struct sockaddr *,
+ const socklen_t, char *, const size_t);
int get_client_address(struct sockaddr_in *, struct sockaddr_in *);
int nfs_call_umount(clnt_addr_t *, dirpath *);
int clnt_ping(struct sockaddr_in *, const unsigned long,