wg-quick: add android implementation
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
parent
08c78a65af
commit
a563ba2cf9
666
src/wg-quick/android.c
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666
src/wg-quick/android.c
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@ -0,0 +1,666 @@
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/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*
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* This is a shell script written in C. It very intentionally still functions like
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* a shell script, calling out to external executables such as ip(8).
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*/
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#define _GNU_SOURCE
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <string.h>
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#include <strings.h>
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#include <stdarg.h>
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#include <ctype.h>
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#include <time.h>
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#include <unistd.h>
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#include <errno.h>
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#include <regex.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/param.h>
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#ifndef WG_CONFIG_SEARCH_PATHS
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#define WG_CONFIG_SEARCH_PATHS "/data/misc/wireguard /data/data/com.wireguard.android/files"
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#endif
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#define _printf_(x, y) __attribute__((format(printf, x, y)))
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#define _cleanup_(x) __attribute__((cleanup(x)))
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
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static bool is_exiting = false;
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static void *xmalloc(size_t size)
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{
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void *ret = malloc(size);
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if (ret)
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return ret;
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perror("Error: malloc");
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exit(errno);
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}
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static void *xstrdup(const char *str)
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{
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char *ret = strdup(str);
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if (ret)
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return ret;
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perror("Error: strdup");
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exit(errno);
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}
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static void xregcomp(regex_t *preg, const char *regex, int cflags)
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{
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if (regcomp(preg, regex, cflags)) {
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fprintf(stderr, "Error: Regex compilation error\n");
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exit(EBADR);
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}
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}
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static char *concat(char *first, ...)
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{
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va_list args;
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size_t len = 0;
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char *ret;
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va_start(args, first);
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for (char *i = first; i; i = va_arg(args, char *))
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len += strlen(i);
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va_end(args);
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ret = xmalloc(len + 1);
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ret[0] = '\0';
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va_start(args, first);
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for (char *i = first; i; i = va_arg(args, char *))
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strcat(ret, i);
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va_end(args);
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return ret;
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}
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static char *concat_and_free(char *orig, const char *delim, const char *new_line)
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{
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char *ret;
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if (!orig)
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ret = xstrdup(new_line);
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else
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ret = concat(orig, delim, new_line, NULL);
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free(orig);
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return ret;
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}
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struct command_buffer {
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char *line;
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size_t len;
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FILE *stream;
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};
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static void free_command_buffer(struct command_buffer *c)
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{
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if (!c)
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return;
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if (c->stream)
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pclose(c->stream);
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free(c->line);
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}
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static void freep(void *p)
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{
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free(*(void **)p);
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}
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static void fclosep(FILE **f)
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{
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if (*f)
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fclose(*f);
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}
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#define _cleanup_free_ _cleanup_(freep)
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#define _cleanup_fclose_ _cleanup_(fclosep)
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#define DEFINE_CMD(name) _cleanup_(free_command_buffer) struct command_buffer name = { 0 };
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static char *vcmd_ret(struct command_buffer *c, const char *cmd_fmt, va_list args)
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{
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_cleanup_free_ char *cmd = NULL;
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if (!c->stream && !cmd_fmt)
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return NULL;
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if (c->stream && cmd_fmt)
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pclose(c->stream);
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if (cmd_fmt) {
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if (vasprintf(&cmd, cmd_fmt, args) < 0) {
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perror("Error: vasprintf");
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exit(errno);
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}
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c->stream = popen(cmd, "r");
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if (!c->stream) {
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perror("Error: popen");
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exit(errno);
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}
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}
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errno = 0;
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if (getline(&c->line, &c->len, c->stream) < 0) {
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if (errno) {
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perror("Error: getline");
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exit(errno);
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}
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return NULL;
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}
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return c->line;
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}
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_printf_(1, 2) static void cmd(const char *cmd_fmt, ...)
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{
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_cleanup_free_ char *cmd = NULL;
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va_list args;
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int ret;
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va_start(args, cmd_fmt);
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if (vasprintf(&cmd, cmd_fmt, args) < 0) {
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perror("Error: vasprintf");
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exit(errno);
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}
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va_end(args);
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printf("[#] %s\n", cmd);
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ret = system(cmd);
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if (ret < 0)
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ret = ESRCH;
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else if (ret > 0)
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ret = WIFEXITED(ret) ? WEXITSTATUS(ret) : EIO;
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if (ret && !is_exiting)
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exit(ret);
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}
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_printf_(2, 3) static char *cmd_ret(struct command_buffer *c, const char *cmd_fmt, ...)
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{
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va_list args;
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char *ret;
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va_start(args, cmd_fmt);
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ret = vcmd_ret(c, cmd_fmt, args);
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va_end(args);
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return ret;
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}
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_printf_(1, 2) static void cndc(const char *cmd_fmt, ...)
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{
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DEFINE_CMD(c);
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int error_code;
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char *ret;
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va_list args;
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_cleanup_free_ char *ndc_fmt = concat("ndc ", cmd_fmt, NULL);
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va_start(args, cmd_fmt);
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printf("[#] ");
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vprintf(ndc_fmt, args);
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printf("\n");
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va_end(args);
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va_start(args, cmd_fmt);
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ret = vcmd_ret(&c, ndc_fmt, args);
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va_end(args);
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if (!ret) {
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fprintf(stderr, "Error: could not call ndc\n");
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exit(ENOSYS);
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}
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error_code = atoi(ret);
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if (error_code >= 400 && error_code < 600) {
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fprintf(stderr, "Error: %s\n", ret);
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exit(ENONET);
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}
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}
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static void auto_su(int argc, char *argv[])
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{
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char *args[argc + 4];
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if (!getuid())
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return;
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args[0] = "su";
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args[1] = "-p";
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args[2] = "-c";
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memcpy(&args[3], argv, argc * sizeof(*args));
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args[argc + 3] = NULL;
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printf("[$] su -p -c ");
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for (int i = 0; i < argc; ++i)
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printf("%s%c", argv[i], i == argc - 1 ? '\n' : ' ');
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execvp("su", args);
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exit(errno);
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}
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static void add_if(const char *iface)
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{
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cmd("ip link add %s type wireguard", iface);
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}
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static void del_if(const char *iface)
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{
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DEFINE_CMD(c);
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regex_t reg;
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regmatch_t matches[2];
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char *netid = NULL;
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_cleanup_free_ char *regex = concat("0xc([0-9a-f]+)/0xcffff lookup ", iface, NULL);
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xregcomp(®, regex, REG_EXTENDED);
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cmd("ip link del %s", iface);
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for (char *ret = cmd_ret(&c, "ip rule show"); ret; ret = cmd_ret(&c, NULL)) {
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if (!regexec(®, ret, ARRAY_SIZE(matches), matches, 0)) {
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ret[matches[1].rm_eo] = '\0';
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netid = &ret[matches[1].rm_so];
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break;
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}
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}
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if (netid)
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cndc("network destroy %lu", strtoul(netid, NULL, 16));
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}
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static void up_if(unsigned int *netid, const char *iface)
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{
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srandom(time(NULL) ^ getpid()); /* Not real randomness. */
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while (*netid < 4096)
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*netid = random() & 0xfffe;
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cmd("wg set %s fwmark 0x20000", iface);
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cndc("interface setcfg %s up", iface);
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cndc("network create %u vpn 1 1", *netid);
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cndc("network interface add %u %s", *netid, iface);
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cndc("network users add %u 0-99999", *netid);
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}
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static void set_dnses(unsigned int netid, const char *dnses)
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{
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size_t len = strlen(dnses);
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if (len > (1<<16))
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return;
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_cleanup_free_ char *mutable = xstrdup(dnses);
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_cleanup_free_ char *arglist = xmalloc(len * 4 + 1);
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_cleanup_free_ char *arg = xmalloc(len + 4);
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if (!len)
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return;
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arglist[0] = '\0';
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for (char *dns = strtok(mutable, ", \t\n"); dns; dns = strtok(NULL, ", \t\n")) {
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if (strchr(dns, '\'') || strchr(dns, '\\'))
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continue;
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snprintf(arg, len + 3, "'%s' ", dns);
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strncat(arglist, arg, len * 4 - 1);
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}
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if (!strlen(arglist))
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return;
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cndc("resolver setnetdns %u '' %s", netid, arglist);
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}
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static void add_addr(const char *iface, const char *addr)
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{
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if (strchr(addr, ':')) {
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cndc("interface ipv6 %s enable", iface);
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cmd("ip -6 addr add '%s' dev %s", addr, iface);
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} else {
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_cleanup_free_ char *mut_addr = strdup(addr);
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char *slash = strchr(mut_addr, '/');
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unsigned char mask = 32;
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if (slash) {
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*slash = '\0';
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mask = atoi(slash + 1);
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}
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cndc("interface setcfg %s '%s' %u", iface, mut_addr, mask);
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}
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}
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static void set_addr(const char *iface, const char *addrs)
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{
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_cleanup_free_ char *mutable = xstrdup(addrs);
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for (char *addr = strtok(mutable, ", \t\n"); addr; addr = strtok(NULL, ", \t\n")) {
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if (strchr(addr, '\'') || strchr(addr, '\\'))
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continue;
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add_addr(iface, addr);
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}
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}
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static int get_route_mtu(const char *endpoint)
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{
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DEFINE_CMD(c_route);
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DEFINE_CMD(c_dev);
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regmatch_t matches[2];
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regex_t regex_mtu, regex_dev;
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char *route, *mtu, *dev;
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xregcomp(®ex_mtu, "mtu ([0-9]+)", REG_EXTENDED);
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xregcomp(®ex_dev, "dev ([^ ]+)", REG_EXTENDED);
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if (strcmp(endpoint, "default"))
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route = cmd_ret(&c_route, "ip -o route get %s", endpoint);
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else
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route = cmd_ret(&c_route, "ip -o route show %s", endpoint);
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if (!route)
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return -1;
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if (!regexec(®ex_mtu, route, ARRAY_SIZE(matches), matches, 0)) {
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route[matches[1].rm_eo] = '\0';
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mtu = &route[matches[1].rm_so];
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} else if (!regexec(®ex_dev, route, ARRAY_SIZE(matches), matches, 0)) {
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route[matches[1].rm_eo] = '\0';
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dev = &route[matches[1].rm_so];
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route = cmd_ret(&c_dev, "ip -o link show dev %s", dev);
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if (!route)
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return -1;
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if (regexec(®ex_mtu, route, ARRAY_SIZE(matches), matches, 0))
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return -1;
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route[matches[1].rm_eo] = '\0';
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mtu = &route[matches[1].rm_so];
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} else
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return -1;
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return atoi(mtu);
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}
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static void set_mtu(const char *iface, unsigned int mtu)
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{
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DEFINE_CMD(c_endpoints);
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regex_t regex_endpoint;
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regmatch_t matches[2];
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int endpoint_mtu, next_mtu;
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if (mtu) {
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cndc("interface setmtu %s %u", iface, mtu);
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return;
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}
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xregcomp(®ex_endpoint, "^\\[?([a-z0-9:.]+)\\]?:[0-9]+$", REG_EXTENDED);
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endpoint_mtu = get_route_mtu("default");
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if (endpoint_mtu == -1)
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endpoint_mtu = 1500;
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for (char *endpoint = cmd_ret(&c_endpoints, "wg show %s endpoints", iface); endpoint; endpoint = cmd_ret(&c_endpoints, NULL)) {
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if (regexec(®ex_endpoint, endpoint, ARRAY_SIZE(matches), matches, 0))
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continue;
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endpoint[matches[1].rm_eo] = '\0';
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endpoint = &endpoint[matches[1].rm_so];
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next_mtu = get_route_mtu(endpoint);
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if (next_mtu > 0 && next_mtu < endpoint_mtu)
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endpoint_mtu = next_mtu;
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}
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cndc("interface setmtu %s %d", iface, endpoint_mtu - 80);
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}
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static void add_route(const char *iface, unsigned int netid, const char *route)
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{
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cndc("network route add %u %s %s", netid, iface, route);
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}
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static void set_routes(const char *iface, unsigned int netid)
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{
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DEFINE_CMD(c);
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for (char *allowedips = cmd_ret(&c, "wg show %s allowed-ips", iface); allowedips; allowedips = cmd_ret(&c, NULL)) {
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char *start = strchr(allowedips, '\t');
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if (!start)
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continue;
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++start;
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for (char *allowedip = strtok(start, " \n"); allowedip; allowedip = strtok(NULL, " \n"))
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add_route(iface, netid, allowedip);
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}
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}
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static void set_config(const char *iface, const char *config)
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{
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FILE *config_writer;
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_cleanup_free_ char *cmd = concat("wg setconf ", iface, " /proc/self/fd/0", NULL);
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int ret;
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printf("[#] %s\n", cmd);
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config_writer = popen(cmd, "w");
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if (!config_writer) {
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perror("Error: popen");
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exit(errno);
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}
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if (fputs(config, config_writer) < 0) {
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perror("Error: fputs");
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exit(errno);
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}
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ret = pclose(config_writer);
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if (ret)
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exit(WIFEXITED(ret) ? WEXITSTATUS(ret) : EIO);
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}
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static void broadcast_change(void)
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{
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const char *pkg = getenv("CALLING_PACKAGE");
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if (!pkg || strcmp(pkg, "com.wireguard.android"))
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cmd("am broadcast -a com.wireguard.android.WGQUICK_CHANGE com.wireguard.android");
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}
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static void print_search_paths(FILE *file, const char *prefix)
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{
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_cleanup_free_ char *paths = strdup(WG_CONFIG_SEARCH_PATHS);
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||||
|
||||
for (char *path = strtok(paths, " "); path; path = strtok(NULL, " "))
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fprintf(file, "%s%s\n", prefix, path);
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}
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static void cmd_usage(const char *program)
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{
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printf( "Usage: %s [ up | down ] [ CONFIG_FILE | INTERFACE ]\n"
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"\n"
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" CONFIG_FILE is a configuration file, whose filename is the interface name\n"
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||||
" followed by `.conf'. Otherwise, INTERFACE is an interface name, with\n"
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||||
" configuration found at:\n\n", program);
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print_search_paths(stdout, " - ");
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printf( "\n It is to be readable by wg(8)'s `setconf' sub-command, with the exception\n"
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||||
" of the following additions to the [Interface] section, which are handled by\n"
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||||
" this program:\n\n"
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||||
" - 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"
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||||
" - MTU: an optional MTU for the interface; if unspecified, auto-calculated.\n"
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" - DNS: an optional DNS server to use while the device is up.\n\n"
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||||
" 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(®ex_iface, "^[a-zA-Z0-9_=+.-]{1,15}$", REG_EXTENDED | REG_NOSUB);
|
||||
xregcomp(®ex_conf, "/?([a-zA-Z0-9_=+.-]{1,15})\\.conf$", REG_EXTENDED);
|
||||
|
||||
if (!regexec(®ex_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(®ex_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;
|
||||
}
|
||||
Loading…
Reference in a new issue