net.c: Combine host_and_port() and __get_sock_name().

host_and_port() is only called by __get_sock_name().
Both functions are short enough, and merging these
two functions has the additional benefit that we can
always return the same static buffer.

Compiling with -Wwrite-strings previously caused a
warning due to returning either a string literal, or
the static buffer. We now always print into that buffer
and return it.

This also improves the error message which is returned
in the static buffer in case of failures: Previously we
returned "(don't know)" if getname() failed and "(unknown)"
if getnameinfo() failed. This turns it into "(unknown)" in
the former case and "(lookup error)" otherwise.

diff --git a/net.c b/net.c
index 697e3b76963babf6b7d4aaec4e83c400e0060deb..2f720b10477aee8214cac5a5223ca4378b29bd5f 100644 (file)
--- a/net.c
+++ b/net.c
@@ -594,37 +594,6 @@ int generic_max_transport_msg_size(int sockfd)
        return generic_mtu(af_type) - estimated_header_overhead(af_type);
 }
 
-/**
- * Print numeric host and port number (beware - uses static char).
- *
- * \param sa The IPv4/IPv6 socket address to use.
- *
- * \return Host string in numeric host:port format, \sa parse_url().
- * \sa getnameinfo(3), services(5), nsswitch.conf(5)
- */
-static char *host_and_port(const struct sockaddr_storage *ss)
-{
-       const struct sockaddr *sa = normalize_ip_address(ss);
-       char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
-       static char output[sizeof(hbuf) + sizeof(sbuf) + 4];
-       int ret;
-
-       ret = getnameinfo(sa, salen(sa),
-                         hbuf, sizeof(hbuf),
-                         sbuf, sizeof(sbuf),
-                         NI_NUMERICHOST | NI_NUMERICSERV);
-       if (ret) {
-               snprintf(output, sizeof(output), "(unknown)");
-               PARA_WARNING_LOG("hostname lookup error (%s).\n",
-                                gai_strerror(ret));
-       } else if (sa->sa_family == AF_INET6) {
-               snprintf(output, sizeof(output), "[%s]:%s", hbuf, sbuf);
-       } else {
-               snprintf(output, sizeof(output), "%s:%s", hbuf, sbuf);
-       }
-       return output;
-}
-
 /**
  * Look up the local or remote side of a connected socket structure.
  *
@@ -633,23 +602,39 @@ static char *host_and_port(const struct sockaddr_storage *ss)
  * remote side.
  *
  * \return A static character string identifying hostname and port of the
- * chosen side.
+ * chosen side in numeric host:port format.
  *
- * \sa getsockname(2), getpeername(2).
+ * \sa getsockname(2), getpeername(2), parse_url(), getnameinfo(3),
+ * services(5), nsswitch.conf(5).
  */
 static char *__get_sock_name(int fd, int (*getname)(int, struct sockaddr*,
                socklen_t *))
 {
        struct sockaddr_storage ss;
+       const struct sockaddr *sa;
        socklen_t sslen = sizeof(ss);
+       char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
+       static char output[sizeof(hbuf) + sizeof(sbuf) + 4];
+       int ret;
 
        if (getname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
-               static char *dont_know = "(don't know)";
                PARA_ERROR_LOG("can not determine address from fd %d: %s\n",
                        fd, strerror(errno));
-               return dont_know;
+               snprintf(output, sizeof(output), "(unknown)");
+               return output;
        }
-       return host_and_port(&ss);
+       sa = normalize_ip_address(&ss);
+       ret = getnameinfo(sa, salen(sa), hbuf, sizeof(hbuf), sbuf,
+               sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV);
+       if (ret) {
+               PARA_WARNING_LOG("hostname lookup error (%s).\n",
+                       gai_strerror(ret));
+               snprintf(output, sizeof(output), "(lookup error)");
+       } else if (sa->sa_family == AF_INET6)
+               snprintf(output, sizeof(output), "[%s]:%s", hbuf, sbuf);
+       else
+               snprintf(output, sizeof(output), "%s:%s", hbuf, sbuf);
+       return output;
 }
 
 /**