wg-quick: add android implementation

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2018-05-14 18:20:13 +02:00
parent 08c78a65af
commit a563ba2cf9
1 changed files with 666 additions and 0 deletions

666
src/wg-quick/android.c Normal file
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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*
* This is a shell script written in C. It very intentionally still functions like
* a shell script, calling out to external executables such as ip(8).
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <strings.h>
#include <stdarg.h>
#include <ctype.h>
#include <time.h>
#include <unistd.h>
#include <errno.h>
#include <regex.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/param.h>
#ifndef WG_CONFIG_SEARCH_PATHS
#define WG_CONFIG_SEARCH_PATHS "/data/misc/wireguard /data/data/com.wireguard.android/files"
#endif
#define _printf_(x, y) __attribute__((format(printf, x, y)))
#define _cleanup_(x) __attribute__((cleanup(x)))
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
static bool is_exiting = false;
static void *xmalloc(size_t size)
{
void *ret = malloc(size);
if (ret)
return ret;
perror("Error: malloc");
exit(errno);
}
static void *xstrdup(const char *str)
{
char *ret = strdup(str);
if (ret)
return ret;
perror("Error: strdup");
exit(errno);
}
static void xregcomp(regex_t *preg, const char *regex, int cflags)
{
if (regcomp(preg, regex, cflags)) {
fprintf(stderr, "Error: Regex compilation error\n");
exit(EBADR);
}
}
static char *concat(char *first, ...)
{
va_list args;
size_t len = 0;
char *ret;
va_start(args, first);
for (char *i = first; i; i = va_arg(args, char *))
len += strlen(i);
va_end(args);
ret = xmalloc(len + 1);
ret[0] = '\0';
va_start(args, first);
for (char *i = first; i; i = va_arg(args, char *))
strcat(ret, i);
va_end(args);
return ret;
}
static char *concat_and_free(char *orig, const char *delim, const char *new_line)
{
char *ret;
if (!orig)
ret = xstrdup(new_line);
else
ret = concat(orig, delim, new_line, NULL);
free(orig);
return ret;
}
struct command_buffer {
char *line;
size_t len;
FILE *stream;
};
static void free_command_buffer(struct command_buffer *c)
{
if (!c)
return;
if (c->stream)
pclose(c->stream);
free(c->line);
}
static void freep(void *p)
{
free(*(void **)p);
}
static void fclosep(FILE **f)
{
if (*f)
fclose(*f);
}
#define _cleanup_free_ _cleanup_(freep)
#define _cleanup_fclose_ _cleanup_(fclosep)
#define DEFINE_CMD(name) _cleanup_(free_command_buffer) struct command_buffer name = { 0 };
static char *vcmd_ret(struct command_buffer *c, const char *cmd_fmt, va_list args)
{
_cleanup_free_ char *cmd = NULL;
if (!c->stream && !cmd_fmt)
return NULL;
if (c->stream && cmd_fmt)
pclose(c->stream);
if (cmd_fmt) {
if (vasprintf(&cmd, cmd_fmt, args) < 0) {
perror("Error: vasprintf");
exit(errno);
}
c->stream = popen(cmd, "r");
if (!c->stream) {
perror("Error: popen");
exit(errno);
}
}
errno = 0;
if (getline(&c->line, &c->len, c->stream) < 0) {
if (errno) {
perror("Error: getline");
exit(errno);
}
return NULL;
}
return c->line;
}
_printf_(1, 2) static void cmd(const char *cmd_fmt, ...)
{
_cleanup_free_ char *cmd = NULL;
va_list args;
int ret;
va_start(args, cmd_fmt);
if (vasprintf(&cmd, cmd_fmt, args) < 0) {
perror("Error: vasprintf");
exit(errno);
}
va_end(args);
printf("[#] %s\n", cmd);
ret = system(cmd);
if (ret < 0)
ret = ESRCH;
else if (ret > 0)
ret = WIFEXITED(ret) ? WEXITSTATUS(ret) : EIO;
if (ret && !is_exiting)
exit(ret);
}
_printf_(2, 3) static char *cmd_ret(struct command_buffer *c, const char *cmd_fmt, ...)
{
va_list args;
char *ret;
va_start(args, cmd_fmt);
ret = vcmd_ret(c, cmd_fmt, args);
va_end(args);
return ret;
}
_printf_(1, 2) static void cndc(const char *cmd_fmt, ...)
{
DEFINE_CMD(c);
int error_code;
char *ret;
va_list args;
_cleanup_free_ char *ndc_fmt = concat("ndc ", cmd_fmt, NULL);
va_start(args, cmd_fmt);
printf("[#] ");
vprintf(ndc_fmt, args);
printf("\n");
va_end(args);
va_start(args, cmd_fmt);
ret = vcmd_ret(&c, ndc_fmt, args);
va_end(args);
if (!ret) {
fprintf(stderr, "Error: could not call ndc\n");
exit(ENOSYS);
}
error_code = atoi(ret);
if (error_code >= 400 && error_code < 600) {
fprintf(stderr, "Error: %s\n", ret);
exit(ENONET);
}
}
static void auto_su(int argc, char *argv[])
{
char *args[argc + 4];
if (!getuid())
return;
args[0] = "su";
args[1] = "-p";
args[2] = "-c";
memcpy(&args[3], argv, argc * sizeof(*args));
args[argc + 3] = NULL;
printf("[$] su -p -c ");
for (int i = 0; i < argc; ++i)
printf("%s%c", argv[i], i == argc - 1 ? '\n' : ' ');
execvp("su", args);
exit(errno);
}
static void add_if(const char *iface)
{
cmd("ip link add %s type wireguard", iface);
}
static void del_if(const char *iface)
{
DEFINE_CMD(c);
regex_t reg;
regmatch_t matches[2];
char *netid = NULL;
_cleanup_free_ char *regex = concat("0xc([0-9a-f]+)/0xcffff lookup ", iface, NULL);
xregcomp(&reg, regex, REG_EXTENDED);
cmd("ip link del %s", iface);
for (char *ret = cmd_ret(&c, "ip rule show"); ret; ret = cmd_ret(&c, NULL)) {
if (!regexec(&reg, ret, ARRAY_SIZE(matches), matches, 0)) {
ret[matches[1].rm_eo] = '\0';
netid = &ret[matches[1].rm_so];
break;
}
}
if (netid)
cndc("network destroy %lu", strtoul(netid, NULL, 16));
}
static void up_if(unsigned int *netid, const char *iface)
{
srandom(time(NULL) ^ getpid()); /* Not real randomness. */
while (*netid < 4096)
*netid = random() & 0xfffe;
cmd("wg set %s fwmark 0x20000", iface);
cndc("interface setcfg %s up", iface);
cndc("network create %u vpn 1 1", *netid);
cndc("network interface add %u %s", *netid, iface);
cndc("network users add %u 0-99999", *netid);
}
static void set_dnses(unsigned int netid, const char *dnses)
{
size_t len = strlen(dnses);
if (len > (1<<16))
return;
_cleanup_free_ char *mutable = xstrdup(dnses);
_cleanup_free_ char *arglist = xmalloc(len * 4 + 1);
_cleanup_free_ char *arg = xmalloc(len + 4);
if (!len)
return;
arglist[0] = '\0';
for (char *dns = strtok(mutable, ", \t\n"); dns; dns = strtok(NULL, ", \t\n")) {
if (strchr(dns, '\'') || strchr(dns, '\\'))
continue;
snprintf(arg, len + 3, "'%s' ", dns);
strncat(arglist, arg, len * 4 - 1);
}
if (!strlen(arglist))
return;
cndc("resolver setnetdns %u '' %s", netid, arglist);
}
static void add_addr(const char *iface, const char *addr)
{
if (strchr(addr, ':')) {
cndc("interface ipv6 %s enable", iface);
cmd("ip -6 addr add '%s' dev %s", addr, iface);
} else {
_cleanup_free_ char *mut_addr = strdup(addr);
char *slash = strchr(mut_addr, '/');
unsigned char mask = 32;
if (slash) {
*slash = '\0';
mask = atoi(slash + 1);
}
cndc("interface setcfg %s '%s' %u", iface, mut_addr, mask);
}
}
static void set_addr(const char *iface, const char *addrs)
{
_cleanup_free_ char *mutable = xstrdup(addrs);
for (char *addr = strtok(mutable, ", \t\n"); addr; addr = strtok(NULL, ", \t\n")) {
if (strchr(addr, '\'') || strchr(addr, '\\'))
continue;
add_addr(iface, addr);
}
}
static int get_route_mtu(const char *endpoint)
{
DEFINE_CMD(c_route);
DEFINE_CMD(c_dev);
regmatch_t matches[2];
regex_t regex_mtu, regex_dev;
char *route, *mtu, *dev;
xregcomp(&regex_mtu, "mtu ([0-9]+)", REG_EXTENDED);
xregcomp(&regex_dev, "dev ([^ ]+)", REG_EXTENDED);
if (strcmp(endpoint, "default"))
route = cmd_ret(&c_route, "ip -o route get %s", endpoint);
else
route = cmd_ret(&c_route, "ip -o route show %s", endpoint);
if (!route)
return -1;
if (!regexec(&regex_mtu, route, ARRAY_SIZE(matches), matches, 0)) {
route[matches[1].rm_eo] = '\0';
mtu = &route[matches[1].rm_so];
} else if (!regexec(&regex_dev, route, ARRAY_SIZE(matches), matches, 0)) {
route[matches[1].rm_eo] = '\0';
dev = &route[matches[1].rm_so];
route = cmd_ret(&c_dev, "ip -o link show dev %s", dev);
if (!route)
return -1;
if (regexec(&regex_mtu, route, ARRAY_SIZE(matches), matches, 0))
return -1;
route[matches[1].rm_eo] = '\0';
mtu = &route[matches[1].rm_so];
} else
return -1;
return atoi(mtu);
}
static void set_mtu(const char *iface, unsigned int mtu)
{
DEFINE_CMD(c_endpoints);
regex_t regex_endpoint;
regmatch_t matches[2];
int endpoint_mtu, next_mtu;
if (mtu) {
cndc("interface setmtu %s %u", iface, mtu);
return;
}
xregcomp(&regex_endpoint, "^\\[?([a-z0-9:.]+)\\]?:[0-9]+$", REG_EXTENDED);
endpoint_mtu = get_route_mtu("default");
if (endpoint_mtu == -1)
endpoint_mtu = 1500;
for (char *endpoint = cmd_ret(&c_endpoints, "wg show %s endpoints", iface); endpoint; endpoint = cmd_ret(&c_endpoints, NULL)) {
if (regexec(&regex_endpoint, endpoint, ARRAY_SIZE(matches), matches, 0))
continue;
endpoint[matches[1].rm_eo] = '\0';
endpoint = &endpoint[matches[1].rm_so];
next_mtu = get_route_mtu(endpoint);
if (next_mtu > 0 && next_mtu < endpoint_mtu)
endpoint_mtu = next_mtu;
}
cndc("interface setmtu %s %d", iface, endpoint_mtu - 80);
}
static void add_route(const char *iface, unsigned int netid, const char *route)
{
cndc("network route add %u %s %s", netid, iface, route);
}
static void set_routes(const char *iface, unsigned int netid)
{
DEFINE_CMD(c);
for (char *allowedips = cmd_ret(&c, "wg show %s allowed-ips", iface); allowedips; allowedips = cmd_ret(&c, NULL)) {
char *start = strchr(allowedips, '\t');
if (!start)
continue;
++start;
for (char *allowedip = strtok(start, " \n"); allowedip; allowedip = strtok(NULL, " \n"))
add_route(iface, netid, allowedip);
}
}
static void set_config(const char *iface, const char *config)
{
FILE *config_writer;
_cleanup_free_ char *cmd = concat("wg setconf ", iface, " /proc/self/fd/0", NULL);
int ret;
printf("[#] %s\n", cmd);
config_writer = popen(cmd, "w");
if (!config_writer) {
perror("Error: popen");
exit(errno);
}
if (fputs(config, config_writer) < 0) {
perror("Error: fputs");
exit(errno);
}
ret = pclose(config_writer);
if (ret)
exit(WIFEXITED(ret) ? WEXITSTATUS(ret) : EIO);
}
static void broadcast_change(void)
{
const char *pkg = getenv("CALLING_PACKAGE");
if (!pkg || strcmp(pkg, "com.wireguard.android"))
cmd("am broadcast -a com.wireguard.android.WGQUICK_CHANGE com.wireguard.android");
}
static void print_search_paths(FILE *file, const char *prefix)
{
_cleanup_free_ char *paths = strdup(WG_CONFIG_SEARCH_PATHS);
for (char *path = strtok(paths, " "); path; path = strtok(NULL, " "))
fprintf(file, "%s%s\n", prefix, path);
}
static void cmd_usage(const char *program)
{
printf( "Usage: %s [ up | down ] [ CONFIG_FILE | INTERFACE ]\n"
"\n"
" CONFIG_FILE is a configuration file, whose filename is the interface name\n"
" followed by `.conf'. Otherwise, INTERFACE is an interface name, with\n"
" configuration found at:\n\n", program);
print_search_paths(stdout, " - ");
printf( "\n It is to be readable by wg(8)'s `setconf' sub-command, with the exception\n"
" of the following additions to the [Interface] section, which are handled by\n"
" this program:\n\n"
" - Address: may be specified one or more times and contains one or more\n"
" IP addresses (with an optional CIDR mask) to be set for the interface.\n"
" - MTU: an optional MTU for the interface; if unspecified, auto-calculated.\n"
" - DNS: an optional DNS server to use while the device is up.\n\n"
" See wg-quick(8) for more info and examples.\n");
}
static char *cleanup_iface = NULL;
static void cmd_up_cleanup(void)
{
is_exiting = true;
if (cleanup_iface)
del_if(cleanup_iface);
free(cleanup_iface);
}
static void cmd_up(const char *iface, const char *config, unsigned int mtu, const char *addrs, const char *dnses)
{
DEFINE_CMD(c);
unsigned int netid = 0;
if (cmd_ret(&c, "ip link show dev %s 2>/dev/null", iface)) {
fprintf(stderr, "Error: %s already exists\n", iface);
exit(EEXIST);
}
cleanup_iface = xstrdup(iface);
atexit(cmd_up_cleanup);
add_if(iface);
set_config(iface, config);
set_addr(iface, addrs);
up_if(&netid, iface);
set_dnses(netid, dnses);
set_routes(iface, netid);
set_mtu(iface, mtu);
broadcast_change();
free(cleanup_iface);
cleanup_iface = NULL;
exit(EXIT_SUCCESS);
}
static void cmd_down(const char *iface)
{
DEFINE_CMD(c);
bool found = false;
char *ifaces = cmd_ret(&c, "wg show interfaces");
if (ifaces) {
for (char *eiface = strtok(ifaces, " \n"); eiface; eiface = strtok(NULL, " \n")) {
if (!strcmp(iface, eiface)) {
found = true;
break;
}
}
}
if (!found) {
fprintf(stderr, "Error: %s is not a WireGuard interface\n", iface);
exit(EMEDIUMTYPE);
}
del_if(iface);
broadcast_change();
exit(EXIT_SUCCESS);
}
static void parse_options(char **iface, char **config, unsigned int *mtu, char **addrs, char **dnses, const char *arg)
{
_cleanup_fclose_ FILE *file = NULL;
_cleanup_free_ char *line = NULL;
_cleanup_free_ char *filename = NULL;
_cleanup_free_ char *paths = strdup(WG_CONFIG_SEARCH_PATHS);
regex_t regex_iface, regex_conf;
regmatch_t matches[2];
struct stat sbuf;
size_t n = 0;
bool in_interface_section = false;
*iface = *config = *addrs = *dnses = NULL;
*mtu = 0;
xregcomp(&regex_iface, "^[a-zA-Z0-9_=+.-]{1,15}$", REG_EXTENDED | REG_NOSUB);
xregcomp(&regex_conf, "/?([a-zA-Z0-9_=+.-]{1,15})\\.conf$", REG_EXTENDED);
if (!regexec(&regex_iface, arg, 0, NULL, 0)) {
for (char *path = strtok(paths, " "); path; path = strtok(NULL, " ")) {
free(filename);
if (asprintf(&filename, "%s/%s.conf", path, arg) < 0) {
perror("Error: asprintf");
exit(errno);
}
file = fopen(filename, "r");
if (file)
break;
}
if (!file) {
fprintf(stderr, "Error: Unable to find configuration file for `%s' in:\n", arg);
print_search_paths(stderr, "- ");
exit(errno);
}
} else {
filename = xstrdup(arg);
file = fopen(filename, "r");
if (!file) {
fprintf(stderr, "Error: Unable to find configuration file at `%s'\n", filename);
exit(errno);
}
}
if (regexec(&regex_conf, filename, ARRAY_SIZE(matches), matches, 0)) {
fprintf(stderr, "Error: The config file must be a valid interface name, followed by .conf\n");
exit(EINVAL);
}
if (fstat(fileno(file), &sbuf) < 0) {
perror("Error: fstat");
exit(errno);
}
if (sbuf.st_mode & 0007)
fprintf(stderr, "Warning: `%s' is world accessible\n", filename);
filename[matches[1].rm_eo] = 0;
*iface = xstrdup(&filename[matches[1].rm_so]);
while (getline(&line, &n, file) >= 0) {
size_t len = strlen(line), j = 0;
if (len > (1<<16))
return;
_cleanup_free_ char *clean = xmalloc(len + 1);
for (size_t i = 0; i < len; ++i) {
if (!isspace(line[i]))
clean[j++] = line[i];
}
clean[j] = '\0';
if (clean[0] == '[')
in_interface_section = false;
if (!strcasecmp(clean, "[Interface]"))
in_interface_section = true;
if (in_interface_section) {
if (!strncasecmp(clean, "Address=", 8) && j > 8) {
*addrs = concat_and_free(*addrs, ",", clean + 8);
continue;
} else if (!strncasecmp(clean, "DNS=", 4) && j > 4) {
*dnses = concat_and_free(*dnses, ",", clean + 4);
continue;
} else if (!strncasecmp(clean, "MTU=", 4) && j > 4) {
*mtu = atoi(clean + 4);
continue;
}
}
*config = concat_and_free(*config, "", line);
}
if (!*iface)
*iface = xstrdup("");
if (!*config)
*config = xstrdup("");
if (!*addrs)
*addrs = xstrdup("");
if (!*dnses)
*dnses = xstrdup("");
}
int main(int argc, char *argv[])
{
_cleanup_free_ char *iface = NULL;
_cleanup_free_ char *config = NULL;
_cleanup_free_ char *addrs = NULL;
_cleanup_free_ char *dnses = NULL;
unsigned int mtu;
if (argc == 2 && (!strcmp(argv[1], "help") || !strcmp(argv[1], "--help") || !strcmp(argv[1], "-h")))
cmd_usage(argv[0]);
else if (argc == 3 && !strcmp(argv[1], "up")) {
auto_su(argc, argv);
parse_options(&iface, &config, &mtu, &addrs, &dnses, argv[2]);
cmd_up(iface, config, mtu, addrs, dnses);
} else if (argc == 3 && !strcmp(argv[1], "down")) {
auto_su(argc, argv);
parse_options(&iface, &config, &mtu, &addrs, &dnses, argv[2]);
cmd_down(iface);
} else {
cmd_usage(argv[0]);
return 1;
}
return 0;
}