Look up canonical hostname and IP address using getaddrinfo(3) or
gethostbyname(3) only if --interpolated-path or --access-hook were
specified.
Do that by introducing getter functions for canon_hostname and
ip_address and using them for all read accesses. These wrappers call
the new helper lookup_hostname(), which sets the variables only at its
first call.
Signed-off-by: Rene Scharfe <l.s.r@xxxxxx>
---
daemon.c | 37 +++++++++++++++++++++++++++++--------
1 file changed, 29 insertions(+), 8 deletions(-)
diff --git a/daemon.c b/daemon.c
index 54a03bd..ef41943 100644
--- a/daemon.c
+++ b/daemon.c
@@ -61,6 +61,22 @@ static char *canon_hostname;
static char *ip_address;
static char *tcp_port;
+static int hostname_lookup_done;
+
+static void lookup_hostname(void);
+
+static const char *get_canon_hostname(void)
+{
+ lookup_hostname();
+ return canon_hostname;
+}
+
+static const char *get_ip_address(void)
+{
+ lookup_hostname();
+ return ip_address;
+}
+
static void logreport(int priority, const char *err, va_list params)
{
if (log_syslog) {
@@ -147,8 +163,8 @@ static const char *path_ok(const char *directory)
struct strbuf_expand_dict_entry dict[6];
dict[0].placeholder = "H"; dict[0].value = hostname;
- dict[1].placeholder = "CH"; dict[1].value = canon_hostname;
- dict[2].placeholder = "IP"; dict[2].value = ip_address;
+ dict[1].placeholder = "CH"; dict[1].value = get_canon_hostname();
+ dict[2].placeholder = "IP"; dict[2].value = get_ip_address();
dict[3].placeholder = "P"; dict[3].value = tcp_port;
dict[4].placeholder = "D"; dict[4].value = directory;
dict[5].placeholder = NULL; dict[5].value = NULL;
@@ -254,8 +270,8 @@ static int run_access_hook(struct daemon_service *service, const char *dir, cons
*arg++ = service->name;
*arg++ = path;
*arg++ = STRARG(hostname);
- *arg++ = STRARG(canon_hostname);
- *arg++ = STRARG(ip_address);
+ *arg++ = STRARG(get_canon_hostname());
+ *arg++ = STRARG(get_ip_address());
*arg++ = STRARG(tcp_port);
*arg = NULL;
#undef STRARG
@@ -509,6 +525,7 @@ static void parse_host_arg(char *extra_args, int buflen)
}
free(hostname);
hostname = xstrdup_tolower(host);
+ hostname_lookup_done = 0;
}
/* On to the next one */
@@ -517,11 +534,14 @@ static void parse_host_arg(char *extra_args, int buflen)
if (extra_args < end && *extra_args)
die("Invalid request");
}
+}
- /*
- * Locate canonical hostname and its IP address.
- */
- if (hostname) {
+/*
+ * Locate canonical hostname and its IP address.
+ */
+static void lookup_hostname(void)
+{
+ if (!hostname_lookup_done && hostname) {
#ifndef NO_IPV6
struct addrinfo hints;
struct addrinfo *ai;
@@ -569,6 +589,7 @@ static void parse_host_arg(char *extra_args, int buflen)
ip_address = xstrdup(addrbuf);
}
#endif
+ hostname_lookup_done = 1;
}
}
--
2.3.0
--
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