120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
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// SPDX-License-Identifier: MIT
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/*
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* Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#define SOCK_PATH RUNSTATEDIR "/wireguard/"
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#define SOCK_SUFFIX ".sock"
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static FILE *userspace_interface_file(const char *iface)
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{
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struct stat sbuf;
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struct sockaddr_un addr = { .sun_family = AF_UNIX };
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int fd = -1, ret;
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FILE *f = NULL;
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errno = EINVAL;
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if (strchr(iface, '/'))
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goto out;
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ret = snprintf(addr.sun_path, sizeof(addr.sun_path), SOCK_PATH "%s" SOCK_SUFFIX, iface);
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if (ret < 0)
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goto out;
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ret = stat(addr.sun_path, &sbuf);
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if (ret < 0)
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goto out;
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errno = EBADF;
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if (!S_ISSOCK(sbuf.st_mode))
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goto out;
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ret = fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (ret < 0)
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goto out;
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ret = connect(fd, (struct sockaddr *)&addr, sizeof(addr));
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if (ret < 0) {
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if (errno == ECONNREFUSED) /* If the process is gone, we try to clean up the socket. */
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unlink(addr.sun_path);
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goto out;
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}
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f = fdopen(fd, "r+");
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if (f)
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errno = 0;
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out:
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ret = -errno;
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if (ret) {
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if (fd >= 0)
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close(fd);
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errno = -ret;
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return NULL;
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}
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return f;
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}
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static bool userspace_has_wireguard_interface(const char *iface)
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{
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struct stat sbuf;
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struct sockaddr_un addr = { .sun_family = AF_UNIX };
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int fd, ret;
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if (strchr(iface, '/'))
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return false;
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if (snprintf(addr.sun_path, sizeof(addr.sun_path), SOCK_PATH "%s" SOCK_SUFFIX, iface) < 0)
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return false;
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if (stat(addr.sun_path, &sbuf) < 0)
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return false;
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if (!S_ISSOCK(sbuf.st_mode))
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return false;
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ret = fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (ret < 0)
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return false;
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ret = connect(fd, (struct sockaddr *)&addr, sizeof(addr));
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if (ret < 0 && errno == ECONNREFUSED) { /* If the process is gone, we try to clean up the socket. */
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close(fd);
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unlink(addr.sun_path);
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return false;
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}
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close(fd);
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return true;
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}
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static int userspace_get_wireguard_interfaces(struct string_list *list)
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{
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DIR *dir;
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struct dirent *ent;
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size_t len;
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char *end;
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int ret = 0;
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dir = opendir(SOCK_PATH);
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if (!dir)
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return errno == ENOENT ? 0 : -errno;
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while ((ent = readdir(dir))) {
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len = strlen(ent->d_name);
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if (len <= strlen(SOCK_SUFFIX))
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continue;
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end = &ent->d_name[len - strlen(SOCK_SUFFIX)];
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if (strncmp(end, SOCK_SUFFIX, strlen(SOCK_SUFFIX)))
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continue;
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*end = '\0';
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if (!userspace_has_wireguard_interface(ent->d_name))
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continue;
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ret = string_list_add(list, ent->d_name);
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if (ret < 0)
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goto out;
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}
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out:
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closedir(dir);
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return ret;
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}
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