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Introduce new --local-service=host parameter

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Similar to local-service, but more strict. Listen only on localhost
unless other interface is specified. Has no effect when interface is
provided explicitly. I had multiple bugs fillen on Fedora, because I have
changed default configuration to:

interface=lo
bind-interfaces

People just adding configuration parts to /etc/dnsmasq.d or appending to
existing configuration often fail to see some defaults are already there.
Give them auto-ignored configuration as smart default.

Signed-off-by: Petr Menšík <pemensik@redhat.com>

Do not add a new parameter on command line. Instead add just parameter
for behaviour modification of existing local-service option. Now it
accepts two optional values:
- net: exactly the same as before
- host: bind only to lo interface, do not listen on any other addresses
  than loopback.
This commit is contained in:
Petr Menšík
2021-10-05 13:46:51 +02:00
committed by Simon Kelley
parent 63ba726e1f
commit 2748d4e901
4 changed files with 42 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/dnsmasq.c
View File

@@ -868,6 +868,8 @@ int main (int argc, char **argv)
if (option_bool(OPT_LOCAL_SERVICE))
my_syslog(LOG_INFO, _("DNS service limited to local subnets"));
else if (option_bool(OPT_LOCALHOST_SERVICE))
my_syslog(LOG_INFO, _("DNS service limited to localhost"));
}
my_syslog(LOG_INFO, _("compile time options: %s"), compile_opts);

3
src/dnsmasq.h
View File

@@ -281,7 +281,8 @@ struct event_desc {
#define OPT_NORR 69
#define OPT_NO_IDENT 70
#define OPT_CACHE_RR 71
#define OPT_LAST 72
#define OPT_LOCALHOST_SERVICE 72
#define OPT_LAST 73
#define OPTION_BITS (sizeof(unsigned int)*8)
#define OPTION_SIZE ( (OPT_LAST/OPTION_BITS)+((OPT_LAST%OPTION_BITS)!=0) )

44
src/option.c
View File

@@ -222,7 +222,7 @@ static const struct myoption opts[] =
{ "domain-suffix", 1, 0, 's' },
{ "interface", 1, 0, 'i' },
{ "listen-address", 1, 0, 'a' },
{ "local-service", 0, 0, LOPT_LOCAL_SERVICE },
{ "local-service", 2, 0, LOPT_LOCAL_SERVICE },
{ "bogus-priv", 0, 0, 'b' },
{ "bogus-nxdomain", 1, 0, 'B' },
{ "ignore-address", 1, 0, LOPT_IGNORE_ADDR },
@@ -573,7 +573,7 @@ static struct {
{ LOPT_QUIET_DHCP6, OPT_QUIET_DHCP6, NULL, gettext_noop("Do not log routine DHCPv6."), NULL },
{ LOPT_QUIET_RA, OPT_QUIET_RA, NULL, gettext_noop("Do not log RA."), NULL },
{ LOPT_LOG_DEBUG, OPT_LOG_DEBUG, NULL, gettext_noop("Log debugging information."), NULL },
{ LOPT_LOCAL_SERVICE, OPT_LOCAL_SERVICE, NULL, gettext_noop("Accept queries only from directly-connected networks."), NULL },
{ LOPT_LOCAL_SERVICE, ARG_ONE, NULL, gettext_noop("Accept queries only from directly-connected networks."), NULL },
{ LOPT_LOOP_DETECT, OPT_LOOP_DETECT, NULL, gettext_noop("Detect and remove DNS forwarding loops."), NULL },
{ LOPT_IGNORE_ADDR, ARG_DUP, "<ipaddr>", gettext_noop("Ignore DNS responses containing ipaddr."), NULL },
{ LOPT_DHCPTTL, ARG_ONE, "<ttl>", gettext_noop("Set TTL in DNS responses with DHCP-derived addresses."), NULL },
@@ -1411,6 +1411,16 @@ static void dhcp_opt_free(struct dhcp_opt *opt)
free(opt);
}
static void if_names_add(const char *ifname)
{
struct iname *new = opt_malloc(sizeof(struct iname));
new->next = daemon->if_names;
daemon->if_names = new;
/* new->name may be NULL if someone does
"interface=" to disable all interfaces except loop. */
new->name = opt_string_alloc(ifname);
new->flags = 0;
}
/* This is too insanely large to keep in-line in the switch */
static int parse_dhcp_opt(char *errstr, char *arg, int flags)
@@ -2835,14 +2845,8 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
case 'i': /* --interface */
do {
struct iname *new = opt_malloc(sizeof(struct iname));
comma = split(arg);
new->next = daemon->if_names;
daemon->if_names = new;
/* new->name may be NULL if someone does
"interface=" to disable all interfaces except loop. */
new->name = opt_string_alloc(arg);
new->flags = 0;
comma = split(arg);
if_names_add(arg);
arg = comma;
} while (arg);
break;
@@ -3408,6 +3412,15 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
ret_err(gen_err);
else if (daemon->max_logs > 100)
daemon->max_logs = 100;
break;
case LOPT_LOCAL_SERVICE: /* --local-service */
if (!arg || !strcmp(arg, "net"))
set_option_bool(OPT_LOCAL_SERVICE);
else if (!strcmp(arg, "host"))
set_option_bool(OPT_LOCALHOST_SERVICE);
else
ret_err(gen_err);
break;
case 'P': /* --edns-packet-max */
@@ -6153,7 +6166,16 @@ void read_opts(int argc, char **argv, char *compile_opts)
/* If there's access-control config, then ignore --local-service, it's intended
as a system default to keep otherwise unconfigured installations safe. */
if (daemon->if_names || daemon->if_except || daemon->if_addrs || daemon->authserver)
reset_option_bool(OPT_LOCAL_SERVICE);
{
reset_option_bool(OPT_LOCAL_SERVICE);
reset_option_bool(OPT_LOCALHOST_SERVICE);
}
else if (option_bool(OPT_LOCALHOST_SERVICE) && !option_bool(OPT_LOCAL_SERVICE))
{
/* listen only on localhost, emulate --interface=lo --bind-interfaces */
if_names_add(NULL);
set_option_bool(OPT_NOWILD);
}
if (testmode)
{