wg: first additions of userspace integration
This is designed to work with a server that follows this:
struct sockaddr_un addr = {
.sun_family = AF_UNIX,
.sun_path = "/var/run/wireguard/wguserspace0.sock"
};
int fd, ret;
ssize_t len;
socklen_t socklen;
struct wgdevice *device;
fd = socket(AF_UNIX, SOCK_DGRAM, 0);
if (fd < 0)
exit(1);
if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
exit(1);
for (;;) {
/* First we look at how big the next message is, so we know how much to
* allocate. Note on BSD you can instead use ioctl(fd, FIONREAD, &len). */
len = recv(fd, NULL, 0, MSG_PEEK | MSG_TRUNC);
if (len < 0) {
handle_error();
continue;
}
/* Next we allocate a buffer for the received data. */
device = NULL;
if (len) {
device = malloc(len);
if (!device) {
handle_error();
continue;
}
}
/* Finally we receive the data, storing too the return address. */
socklen = sizeof(addr);
len = recvfrom(fd, device, len, 0, (struct sockaddr *)&addr, (socklen_t *)&socklen);
if (len < 0) {
handle_error();
free(device);
continue;
}
if (!len) { /* If len is zero, it's a "get" request, so we send our device back. */
device = get_current_wireguard_device(&len);
sendto(fd, device, len, 0, (struct sockaddr *)&addr, socklen);
} else { /* Otherwise, we just received a wgdevice, so we should "set" and send back the return status. */
ret = set_current_wireguard_device(device);
sendto(fd, &ret, sizeof(ret), 0, (struct sockaddr *)&addr, socklen);
free(device);
}
}
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
parent
fd14807259
commit
b16641e30c
8 changed files with 268 additions and 50 deletions
11
src/Makefile
11
src/Makefile
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@ -3,12 +3,19 @@ DESTDIR ?=
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BINDIR ?= $(PREFIX)/bin
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LIBDIR ?= $(PREFIX)/lib
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MANDIR ?= $(PREFIX)/share/man
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RUNSTATEDIR ?= /var/run
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CFLAGS += $(shell pkg-config --cflags libmnl 2>/dev/null)
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CFLAGS += -std=gnu11
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CFLAGS += -pedantic -Wall -Wextra
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CFLAGS += -MMD
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LDLIBS += -lresolv $(shell pkg-config --libs libmnl 2>/dev/null || echo -lmnl)
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CFLAGS += -DRUNSTATEDIR="\"$(RUNSTATEDIR)\""
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LDLIBS += -lresolv
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ifeq ($(shell uname -s),Linux)
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LIBMNL_CFLAGS := $(shell pkg-config --cflags libmnl 2>/dev/null)
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LIBMNL_LDLIBS := $(shell pkg-config --libs libmnl 2>/dev/null || echo -lmnl)
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CFLAGS += $(LIBMNL_CFLAGS)
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LDLIBS += $(LIBMNL_LDLIBS)
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endif
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wg: $(patsubst %.c,%.o,$(wildcard *.c))
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@ -5,9 +5,11 @@
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <syscall.h>
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#include <string.h>
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#include <fcntl.h>
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#ifdef __linux
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#include <syscall.h>
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#endif
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#include "curve25519.h"
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#include "base64.h"
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@ -17,7 +19,7 @@ static inline ssize_t get_random_bytes(uint8_t *out, size_t len)
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{
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ssize_t ret;
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int fd;
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#ifdef __NR_getrandom
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#if defined(__NR_getrandom) && defined(__linux__)
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ret = syscall(__NR_getrandom, out, len, 0);
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if (ret >= 0)
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return ret;
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275
src/kernel.c
275
src/kernel.c
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@ -1,25 +1,37 @@
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/* Copyright 2015-2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */
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#include <errno.h>
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#ifdef __linux__
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#include <libmnl/libmnl.h>
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#include <linux/if_link.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#endif
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#include <netinet/in.h>
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#include <net/if.h>
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#include <errno.h>
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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 <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <time.h>
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#include <dirent.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <sys/signal.h>
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#include "kernel.h"
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#include "../uapi.h"
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#define SOCK_PATH RUNSTATEDIR "/wireguard/"
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#define SOCK_SUFFIX ".sock"
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struct inflatable_buffer {
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char *buffer;
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char *next;
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@ -37,19 +49,24 @@ static int add_next_to_inflatable_buffer(struct inflatable_buffer *buffer)
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if (!buffer->good || !buffer->next) {
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free(buffer->next);
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buffer->good = false;
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return 0;
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}
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len = strlen(buffer->next) + 1;
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if (len == 1)
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if (len == 1) {
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free(buffer->next);
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buffer->good = false;
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return 0;
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}
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if (buffer->len - buffer->pos <= len) {
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expand_to = max(buffer->len * 2, buffer->len + len + 1);
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new_buffer = realloc(buffer->buffer, expand_to);
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if (!new_buffer) {
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free(buffer->next);
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buffer->good = false;
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return -errno;
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}
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memset(&new_buffer[buffer->len], 0, expand_to - buffer->len);
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@ -58,10 +75,149 @@ static int add_next_to_inflatable_buffer(struct inflatable_buffer *buffer)
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}
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memcpy(&buffer->buffer[buffer->pos], buffer->next, len);
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free(buffer->next);
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buffer->good = false;
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buffer->pos += len;
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return 0;
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}
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static int userspace_interface_fd(const char *interface)
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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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ret = snprintf(addr.sun_path, sizeof(addr.sun_path) - 1, SOCK_PATH "%s" SOCK_SUFFIX, interface);
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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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ret = -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_DGRAM, 0);
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if (ret < 0)
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goto out;
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ret = bind(fd, (struct sockaddr *)&addr, sizeof(sa_family_t));
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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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out:
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if (ret && fd >= 0)
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close(fd);
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if (!ret)
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ret = fd;
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return ret;
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}
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static bool userspace_has_wireguard_interface(const char *interface)
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{
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int fd = userspace_interface_fd(interface);
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if (fd < 0)
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return false;
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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 inflatable_buffer *buffer)
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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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buffer->next = strdup(ent->d_name);
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buffer->good = true;
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ret = add_next_to_inflatable_buffer(buffer);
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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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static int userspace_set_device(struct wgdevice *dev)
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{
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struct wgpeer *peer;
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size_t len;
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ssize_t ret;
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int ret_code;
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int fd = userspace_interface_fd(dev->interface);
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if (fd < 0)
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return fd;
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for_each_wgpeer(dev, peer, len);
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len = (unsigned char *)peer - (unsigned char *)dev;
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ret = -EBADMSG;
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if (!len)
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goto out;
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ret = send(fd, dev, len, 0);
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if (ret < 0)
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goto out;
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ret = recv(fd, &ret_code, sizeof(ret_code), 0);
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if (ret < 0)
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goto out;
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ret = ret_code;
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out:
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close(fd);
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return (int)ret;
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}
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static int userspace_get_device(struct wgdevice **dev, const char *interface)
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{
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ssize_t len;
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int ret, fd = userspace_interface_fd(interface);
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if (fd < 0)
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return fd;
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*dev = NULL;
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ret = send(fd, NULL, 0, 0);
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if (ret < 0)
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goto out;
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ret = len = recv(fd, NULL, 0, MSG_PEEK | MSG_TRUNC);
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if (len < 0)
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goto out;
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ret = -EBADMSG;
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if ((size_t)len < sizeof(struct wgdevice))
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goto out;
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ret = -ENOMEM;
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*dev = calloc(len, 1);
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if (!*dev)
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goto out;
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ret = recv(fd, *dev, len, 0);
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if (ret < 0)
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goto out;
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ret = 0;
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out:
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if (*dev && ret)
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free(*dev);
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close(fd);
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errno = -ret;
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return ret;
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}
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#ifdef __linux__
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static int parse_linkinfo(const struct nlattr *attr, void *data)
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{
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struct inflatable_buffer *buffer = data;
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@ -96,8 +252,7 @@ static int read_devices_cb(const struct nlmsghdr *nlh, void *data)
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return MNL_CB_OK;
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}
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/* first\0second\0third\0forth\0last\0\0 */
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char *kernel_get_wireguard_interfaces(void)
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static int kernel_get_wireguard_interfaces(struct inflatable_buffer *buffer)
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{
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struct mnl_socket *nl = NULL;
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char *rtnl_buffer = NULL;
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@ -105,22 +260,13 @@ char *kernel_get_wireguard_interfaces(void)
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unsigned int portid, seq;
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ssize_t len;
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int ret = 0;
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struct inflatable_buffer buffer = { 0 };
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struct nlmsghdr *nlh;
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struct ifinfomsg *ifm;
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buffer.len = 4096;
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buffer.buffer = calloc(buffer.len, 1);
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if (!buffer.buffer) {
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ret = -errno;
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goto cleanup;
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}
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ret = -ENOMEM;
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rtnl_buffer = calloc(4096, 1);
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if (!rtnl_buffer) {
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ret = -errno;
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if (!rtnl_buffer)
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goto cleanup;
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}
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nl = mnl_socket_open(NETLINK_ROUTE);
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if (!nl) {
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@ -153,39 +299,41 @@ another:
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ret = -errno;
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goto cleanup;
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}
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if ((len = mnl_cb_run(rtnl_buffer, len, seq, portid, read_devices_cb, &buffer)) < 0) {
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if ((len = mnl_cb_run(rtnl_buffer, len, seq, portid, read_devices_cb, buffer)) < 0) {
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ret = -errno;
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goto cleanup;
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}
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if (len == MNL_CB_OK + 1)
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goto another;
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ret = 0;
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cleanup:
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free(rtnl_buffer);
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if (nl)
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mnl_socket_close(nl);
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errno = -ret;
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if (errno) {
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perror("Error when trying to get a list of Wireguard interfaces");
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free(buffer.buffer);
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return NULL;
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}
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return buffer.buffer;
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return ret;
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}
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bool kernel_has_wireguard_interface(const char *interface)
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static bool kernel_has_wireguard_interface(const char *interface)
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{
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char *interfaces, *this_interface;
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this_interface = interfaces = kernel_get_wireguard_interfaces();
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if (!interfaces)
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char *this_interface;
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struct inflatable_buffer buffer = { .len = 4096 };
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buffer.buffer = calloc(buffer.len, 1);
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if (!buffer.buffer)
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return false;
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if (kernel_get_wireguard_interfaces(&buffer) < 0) {
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free(buffer.buffer);
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return false;
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}
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this_interface = buffer.buffer;
|
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for (size_t len = 0; (len = strlen(this_interface)); this_interface += len + 1) {
|
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if (!strcmp(interface, this_interface)) {
|
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free(interfaces);
|
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free(buffer.buffer);
|
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return true;
|
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}
|
||||
}
|
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free(interfaces);
|
||||
free(buffer.buffer);
|
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return false;
|
||||
}
|
||||
|
||||
|
|
@ -200,7 +348,7 @@ static int do_ioctl(int req, struct ifreq *ifreq)
|
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return ioctl(fd, req, ifreq);
|
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}
|
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|
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int kernel_set_device(struct wgdevice *dev)
|
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static int kernel_set_device(struct wgdevice *dev)
|
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{
|
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struct ifreq ifreq = { .ifr_data = (char *)dev };
|
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memcpy(&ifreq.ifr_name, dev->interface, IFNAMSIZ);
|
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|
|
@ -208,7 +356,7 @@ int kernel_set_device(struct wgdevice *dev)
|
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return do_ioctl(WG_SET_DEVICE, &ifreq);
|
||||
}
|
||||
|
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int kernel_get_device(struct wgdevice **dev, const char *interface)
|
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static int kernel_get_device(struct wgdevice **dev, const char *interface)
|
||||
{
|
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int ret;
|
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struct ifreq ifreq = { 0 };
|
||||
|
|
@ -222,7 +370,6 @@ int kernel_get_device(struct wgdevice **dev, const char *interface)
|
|||
goto out;
|
||||
*dev = calloc(ret + sizeof(struct wgdevice), 1);
|
||||
if (!*dev) {
|
||||
perror("calloc");
|
||||
ret = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
|
@ -240,3 +387,65 @@ out:
|
|||
errno = -ret;
|
||||
return ret;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* first\0second\0third\0forth\0last\0\0 */
|
||||
char *get_wireguard_interfaces(void)
|
||||
{
|
||||
struct inflatable_buffer buffer = { .len = 4096 };
|
||||
int ret;
|
||||
|
||||
ret = -ENOMEM;
|
||||
buffer.buffer = calloc(buffer.len, 1);
|
||||
if (!buffer.buffer)
|
||||
goto cleanup;
|
||||
|
||||
#ifdef __linux__
|
||||
ret = kernel_get_wireguard_interfaces(&buffer);
|
||||
if (ret < 0)
|
||||
goto cleanup;
|
||||
#endif
|
||||
ret = userspace_get_wireguard_interfaces(&buffer);
|
||||
if (ret < 0)
|
||||
goto cleanup;
|
||||
|
||||
cleanup:
|
||||
errno = -ret;
|
||||
if (errno) {
|
||||
perror("Error when trying to get a list of WireGuard interfaces");
|
||||
free(buffer.buffer);
|
||||
return NULL;
|
||||
}
|
||||
return buffer.buffer;
|
||||
}
|
||||
|
||||
int get_device(struct wgdevice **dev, const char *interface)
|
||||
{
|
||||
#ifdef __linux__
|
||||
if (userspace_has_wireguard_interface(interface))
|
||||
return userspace_get_device(dev, interface);
|
||||
return kernel_get_device(dev, interface);
|
||||
#else
|
||||
return userspace_get_device(dev, interface);
|
||||
#endif
|
||||
}
|
||||
|
||||
int set_device(struct wgdevice *dev)
|
||||
{
|
||||
#ifdef __linux__
|
||||
if (userspace_has_wireguard_interface(dev->interface))
|
||||
return userspace_set_device(dev);
|
||||
return kernel_set_device(dev);
|
||||
#else
|
||||
return userspace_set_device(dev);
|
||||
#endif
|
||||
}
|
||||
|
||||
bool has_wireguard_interface(const char *interface)
|
||||
{
|
||||
#ifdef __linux__
|
||||
return userspace_has_wireguard_interface(interface) || kernel_has_wireguard_interface(interface);
|
||||
#else
|
||||
return userspace_has_wireguard_interface(interface);
|
||||
#endif
|
||||
}
|
||||
|
|
|
|||
|
|
@ -7,10 +7,10 @@
|
|||
|
||||
struct wgdevice;
|
||||
|
||||
int kernel_set_device(struct wgdevice *dev);
|
||||
int kernel_get_device(struct wgdevice **dev, const char *interface);
|
||||
char *kernel_get_wireguard_interfaces(void);
|
||||
bool kernel_has_wireguard_interface(const char *interface);
|
||||
int set_device(struct wgdevice *dev);
|
||||
int get_device(struct wgdevice **dev, const char *interface);
|
||||
char *get_wireguard_interfaces(void);
|
||||
bool has_wireguard_interface(const char *interface);
|
||||
|
||||
|
||||
#define for_each_wgpeer(__dev, __peer, __i) for ((__i) = 0, (__peer) = (typeof(__peer))((uint8_t *)(__dev) + sizeof(struct wgdevice)); \
|
||||
|
|
|
|||
|
|
@ -22,7 +22,7 @@ int set_main(int argc, char *argv[])
|
|||
strncpy(device->interface, argv[1], IFNAMSIZ - 1);
|
||||
device->interface[IFNAMSIZ - 1] = 0;
|
||||
|
||||
if (kernel_set_device(device) != 0) {
|
||||
if (set_device(device) != 0) {
|
||||
perror("Unable to set device");
|
||||
goto cleanup;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -45,7 +45,7 @@ int setconf_main(int argc, char *argv[])
|
|||
strncpy(device->interface, argv[1], IFNAMSIZ - 1);
|
||||
device->interface[IFNAMSIZ - 1] = 0;
|
||||
|
||||
if (kernel_set_device(device) != 0) {
|
||||
if (set_device(device) != 0) {
|
||||
perror("Unable to set device");
|
||||
goto cleanup;
|
||||
}
|
||||
|
|
|
|||
10
src/show.c
10
src/show.c
|
|
@ -326,7 +326,7 @@ int show_main(int argc, char *argv[])
|
|||
}
|
||||
|
||||
if (argc == 1 || !strcmp(argv[1], "all")) {
|
||||
char *interfaces = kernel_get_wireguard_interfaces(), *interface;
|
||||
char *interfaces = get_wireguard_interfaces(), *interface;
|
||||
if (!interfaces) {
|
||||
perror("Unable to get devices");
|
||||
return 1;
|
||||
|
|
@ -334,7 +334,7 @@ int show_main(int argc, char *argv[])
|
|||
interface = interfaces;
|
||||
for (size_t len = 0; (len = strlen(interface)); interface += len + 1) {
|
||||
struct wgdevice *device = NULL;
|
||||
if (kernel_get_device(&device, interface) < 0) {
|
||||
if (get_device(&device, interface) < 0) {
|
||||
perror("Unable to get device");
|
||||
continue;
|
||||
}
|
||||
|
|
@ -358,7 +358,7 @@ int show_main(int argc, char *argv[])
|
|||
show_usage();
|
||||
return 1;
|
||||
}
|
||||
interfaces = kernel_get_wireguard_interfaces();
|
||||
interfaces = get_wireguard_interfaces();
|
||||
if (!interfaces) {
|
||||
perror("Unable to get devices");
|
||||
return 1;
|
||||
|
|
@ -371,12 +371,12 @@ int show_main(int argc, char *argv[])
|
|||
show_usage();
|
||||
else {
|
||||
struct wgdevice *device = NULL;
|
||||
if (!kernel_has_wireguard_interface(argv[1])) {
|
||||
if (!has_wireguard_interface(argv[1])) {
|
||||
fprintf(stderr, "`%s` is not a valid WireGuard interface\n", argv[1]);
|
||||
show_usage();
|
||||
return 1;
|
||||
}
|
||||
if (kernel_get_device(&device, argv[1]) < 0) {
|
||||
if (get_device(&device, argv[1]) < 0) {
|
||||
perror("Unable to get device");
|
||||
show_usage();
|
||||
return 1;
|
||||
|
|
|
|||
|
|
@ -31,13 +31,13 @@ int showconf_main(int argc, char *argv[])
|
|||
return 1;
|
||||
}
|
||||
|
||||
if (!kernel_has_wireguard_interface(argv[1])) {
|
||||
if (!has_wireguard_interface(argv[1])) {
|
||||
fprintf(stderr, "`%s` is not a valid WireGuard interface\n", argv[1]);
|
||||
fprintf(stderr, "Usage: %s %s <interface>\n", PROG_NAME, argv[0]);
|
||||
return 1;
|
||||
}
|
||||
|
||||
if (kernel_get_device(&device, argv[1])) {
|
||||
if (get_device(&device, argv[1])) {
|
||||
perror("Unable to get device");
|
||||
goto cleanup;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue