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daemon: look up client-supplied hostname lazily

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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@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe 2015-02-15 19:31:41 +01:00 committed by Junio C Hamano
parent 3c84ac86fc
commit edef953e48
1 changed files with 29 additions and 8 deletions
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37
daemon.c
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@ -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;
@ -271,8 +287,8 @@ 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
@ -529,6 +545,7 @@ 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 */
@ -537,11 +554,14 @@ 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;
@ -589,6 +609,7 @@ static void parse_host_arg(char *extra_args, int buflen)
ip_address = xstrdup(addrbuf);
}
#endif
hostname_lookup_done = 1;
}
}