Introduce two new functions to convert a sockaddr to a presentation format

[nfs-utils.git] / utils / mount / network.c

diff --git a/utils/mount/network.c b/utils/mount/network.c
index c9fd548c5ac47491b176cc2c73375866d34036a2..3f2721b802450134acd165b673f059615cc6f35f 100644 (file)
--- 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);
 }
 
                                        (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.
  *
 /*
  * Attempt to connect a socket, but time out after "timeout" seconds.
  *