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wg-quick: android: disable roaming to v6 networks when v4 is specified

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This works around an unfortunate bug in 464XLAT transitions.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2018-06-17 05:06:37 +02:00
parent 2ce4680bd3
commit 3bbacaaf14
1 changed files with 54 additions and 1 deletions
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55
src/wg-quick/android.c
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@ -13,6 +13,7 @@
#include <string.h>
#include <strings.h>
#include <stdarg.h>
#include <stdint.h>
#include <ctype.h>
#include <time.h>
#include <unistd.h>
@ -428,6 +429,56 @@ static void set_routes(const char *iface, unsigned int netid)
}
}
static void maybe_block_ipv6(const char *iface)
{
DEFINE_CMD(c_endpoints);
DEFINE_CMD(c_listenport);
bool has_ipv6 = false, has_all_none = true;
char *value;
unsigned long listenport;
for (char *endpoint = cmd_ret(&c_endpoints, "wg show %s endpoints", iface); endpoint; endpoint = cmd_ret(&c_endpoints, NULL)) {
char *start = strchr(endpoint, '\t');
if (!start)
continue;
++start;
if (start[0] != '(')
has_all_none = false;
if (start[0] == '[')
has_ipv6 = true;
}
if (has_ipv6 || has_all_none)
return;
cmd("ip link set up dev %s", iface);
value = cmd_ret(&c_listenport, "wg show %s listen-port", iface);
if (!value)
goto set_back_down;
listenport = strtoul(value, NULL, 10);
if (listenport > UINT16_MAX || !listenport)
goto set_back_down;
cmd("ip6tables -I INPUT 1 -p udp --dport %lu -j DROP -m comment --comment \"wireguard rule %s\"", listenport, iface);
set_back_down:
cmd("ip link set down dev %s", iface);
}
static void maybe_unblock_ipv6(const char *iface)
{
regmatch_t matches[2];
regex_t reg;
_cleanup_free_ char *regex = concat("^-A (.* --comment \"wireguard rule ", iface, "\"[^\n]*)\n*$", NULL);
DEFINE_CMD(c);
xregcomp(&reg, regex, REG_EXTENDED);
for (char *rule = cmd_ret(&c, "ip6tables-save"); rule; rule = cmd_ret(&c, NULL)) {
if (!regexec(&reg, rule, ARRAY_SIZE(matches), matches, 0)) {
rule[matches[1].rm_eo] = '\0';
cmd("ip6tables -D %s", &rule[matches[1].rm_so]);
}
}
}
static void set_config(const char *iface, const char *config)
{
FILE *config_writer;
@ -509,6 +560,7 @@ static void cmd_up(const char *iface, const char *config, unsigned int mtu, cons
add_if(iface);
set_config(iface, config);
maybe_block_ipv6(iface);
set_addr(iface, addrs);
up_if(&netid, iface);
set_dnses(netid, dnses);
@ -542,6 +594,7 @@ static void cmd_down(const char *iface)
}
del_if(iface);
maybe_unblock_ipv6(iface);
broadcast_change();
exit(EXIT_SUCCESS);
}
@ -601,7 +654,7 @@ static void parse_options(char **iface, char **config, unsigned int *mtu, char *
if (sbuf.st_mode & 0007)
fprintf(stderr, "Warning: `%s' is world accessible\n", filename);
filename[matches[1].rm_eo] = 0;
filename[matches[1].rm_eo] = '\0';
*iface = xstrdup(&filename[matches[1].rm_so]);
while (getline(&line, &n, file) >= 0) {