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wireguard-tools
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wireguard-tools/src/show.c

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// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include <arpa/inet.h>
#include <inttypes.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <net/if.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <netdb.h>
#include "containers.h"
#include "ipc.h"
#include "terminal.h"
#include "encoding.h"
#include "subcommands.h"
static int peer_cmp(const void *first, const void *second)
{
time_t diff;
const struct wgpeer *a = *(void *const *)first, *b = *(void *const *)second;
if (!a->last_handshake_time.tv_sec && !a->last_handshake_time.tv_nsec && (b->last_handshake_time.tv_sec || b->last_handshake_time.tv_nsec))
return 1;
if (!b->last_handshake_time.tv_sec && !b->last_handshake_time.tv_nsec && (a->last_handshake_time.tv_sec || a->last_handshake_time.tv_nsec))
return -1;
diff = a->last_handshake_time.tv_sec - b->last_handshake_time.tv_sec;
if (!diff)
diff = a->last_handshake_time.tv_nsec - b->last_handshake_time.tv_nsec;
if (diff < 0)
return 1;
if (diff > 0)
return -1;
return 0;
}
/* This, hilariously, is not the right way to sort a linked list... */
static void sort_peers(struct wgdevice *device)
{
size_t peer_count = 0, i = 0;
struct wgpeer *peer, **peers;
for_each_wgpeer(device, peer)
++peer_count;
if (!peer_count)
return;
peers = calloc(peer_count, sizeof(*peers));
if (!peers)
return;
for_each_wgpeer(device, peer)
peers[i++] = peer;
qsort(peers, peer_count, sizeof(*peers), peer_cmp);
device->first_peer = peers[0];
for (i = 1; i < peer_count; ++i) {
peers[i - 1]->next_peer = peers[i];
}
peers[peer_count - 1]->next_peer = NULL;
free(peers);
}
static char *key(const uint8_t key[static WG_KEY_LEN])
{
static char base64[WG_KEY_LEN_BASE64];
key_to_base64(base64, key);
return base64;
}
static const char *maybe_key(const uint8_t maybe_key[static WG_KEY_LEN], bool have_it)
{
if (!have_it)
return "(none)";
return key(maybe_key);
}
static const char *masked_key(const uint8_t masked_key[static WG_KEY_LEN])
{
const char *var = getenv("WG_HIDE_KEYS");
if (var && !strcmp(var, "never"))
return key(masked_key);
return "(hidden)";
}
static char *ip(const struct wgallowedip *ip)
{
static char buf[INET6_ADDRSTRLEN + 1];
memset(buf, 0, INET6_ADDRSTRLEN + 1);
if (ip->family == AF_INET)
inet_ntop(AF_INET, &ip->ip4, buf, INET6_ADDRSTRLEN);
else if (ip->family == AF_INET6)
inet_ntop(AF_INET6, &ip->ip6, buf, INET6_ADDRSTRLEN);
return buf;
}
static char *endpoint(const struct sockaddr *addr)
{
char host[4096 + 1];
char service[512 + 1];
static char buf[sizeof(host) + sizeof(service) + 4];
int ret;
socklen_t addr_len = 0;
memset(buf, 0, sizeof(buf));
if (addr->sa_family == AF_INET)
addr_len = sizeof(struct sockaddr_in);
else if (addr->sa_family == AF_INET6)
addr_len = sizeof(struct sockaddr_in6);
ret = getnameinfo(addr, addr_len, host, sizeof(host), service, sizeof(service), NI_DGRAM | NI_NUMERICSERV | NI_NUMERICHOST);
if (ret) {
strncpy(buf, gai_strerror(ret), sizeof(buf) - 1);
buf[sizeof(buf) - 1] = '\0';
} else
snprintf(buf, sizeof(buf), (addr->sa_family == AF_INET6 && strchr(host, ':')) ? "[%s]:%s" : "%s:%s", host, service);
return buf;
}
static size_t pretty_time(char *buf, const size_t len, unsigned long long left)
{
size_t offset = 0;
unsigned long long years, days, hours, minutes, seconds;
years = left / (365 * 24 * 60 * 60);
left = left % (365 * 24 * 60 * 60);
days = left / (24 * 60 * 60);
left = left % (24 * 60 * 60);
hours = left / (60 * 60);
left = left % (60 * 60);
minutes = left / 60;
seconds = left % 60;
if (years)
offset += snprintf(buf + offset, len - offset, "%s%llu " TERMINAL_FG_CYAN "year%s" TERMINAL_RESET, offset ? ", " : "", years, years == 1 ? "" : "s");
if (days)
offset += snprintf(buf + offset, len - offset, "%s%llu " TERMINAL_FG_CYAN "day%s" TERMINAL_RESET, offset ? ", " : "", days, days == 1 ? "" : "s");
if (hours)
offset += snprintf(buf + offset, len - offset, "%s%llu " TERMINAL_FG_CYAN "hour%s" TERMINAL_RESET, offset ? ", " : "", hours, hours == 1 ? "" : "s");
if (minutes)
offset += snprintf(buf + offset, len - offset, "%s%llu " TERMINAL_FG_CYAN "minute%s" TERMINAL_RESET, offset ? ", " : "", minutes, minutes == 1 ? "" : "s");
if (seconds)
offset += snprintf(buf + offset, len - offset, "%s%llu " TERMINAL_FG_CYAN "second%s" TERMINAL_RESET, offset ? ", " : "", seconds, seconds == 1 ? "" : "s");
return offset;
}
static char *ago(const struct timespec64 *t)
{
static char buf[1024];
size_t offset;
time_t now = time(NULL);
if (now == t->tv_sec)
strncpy(buf, "Now", sizeof(buf) - 1);
else if (now < t->tv_sec)
strncpy(buf, "(" TERMINAL_FG_RED "System clock wound backward; connection problems may ensue." TERMINAL_RESET ")", sizeof(buf) - 1);
else {
offset = pretty_time(buf, sizeof(buf), now - t->tv_sec);
strncpy(buf + offset, " ago", sizeof(buf) - offset - 1);
}
buf[sizeof(buf) - 1] = '\0';
return buf;
}
static char *every(uint16_t seconds)
{
static char buf[1024] = "every ";
pretty_time(buf + strlen("every "), sizeof(buf) - strlen("every ") - 1, seconds);
return buf;
}
static char *bytes(uint64_t b)
{
static char buf[1024];
if (b < 1024ULL)
snprintf(buf, sizeof(buf), "%u " TERMINAL_FG_CYAN "B" TERMINAL_RESET, (unsigned int)b);
else if (b < 1024ULL * 1024ULL)
snprintf(buf, sizeof(buf), "%.2f " TERMINAL_FG_CYAN "KiB" TERMINAL_RESET, (double)b / 1024);
else if (b < 1024ULL * 1024ULL * 1024ULL)
snprintf(buf, sizeof(buf), "%.2f " TERMINAL_FG_CYAN "MiB" TERMINAL_RESET, (double)b / (1024 * 1024));
else if (b < 1024ULL * 1024ULL * 1024ULL * 1024ULL)
snprintf(buf, sizeof(buf), "%.2f " TERMINAL_FG_CYAN "GiB" TERMINAL_RESET, (double)b / (1024 * 1024 * 1024));
else
snprintf(buf, sizeof(buf), "%.2f " TERMINAL_FG_CYAN "TiB" TERMINAL_RESET, (double)b / (1024 * 1024 * 1024) / 1024);
return buf;
}
static const char *COMMAND_NAME;
static void show_usage(void)
{
fprintf(stderr, "Usage: %s %s { <interface> | all | interfaces } [public-key | private-key | listen-port | fwmark | peers | preshared-keys | endpoints | allowed-ips | latest-handshakes | transfer | persistent-keepalive | dump]\n", PROG_NAME, COMMAND_NAME);
}
static void pretty_print(struct wgdevice *device)
{
struct wgpeer *peer;
struct wgallowedip *allowedip;
terminal_printf(TERMINAL_RESET);
terminal_printf(TERMINAL_FG_GREEN TERMINAL_BOLD "interface" TERMINAL_RESET ": " TERMINAL_FG_GREEN "%s" TERMINAL_RESET "\n", device->name);
if (device->flags & WGDEVICE_HAS_PUBLIC_KEY)
terminal_printf(" " TERMINAL_BOLD "public key" TERMINAL_RESET ": %s\n", key(device->public_key));
if (device->flags & WGDEVICE_HAS_PRIVATE_KEY)
terminal_printf(" " TERMINAL_BOLD "private key" TERMINAL_RESET ": %s\n", masked_key(device->private_key));
if (device->listen_port)
terminal_printf(" " TERMINAL_BOLD "listening port" TERMINAL_RESET ": %u\n", device->listen_port);
if (device->fwmark)
terminal_printf(" " TERMINAL_BOLD "fwmark" TERMINAL_RESET ": 0x%x\n", device->fwmark);
if (device->first_peer) {
sort_peers(device);
terminal_printf("\n");
}
for_each_wgpeer(device, peer) {
terminal_printf(TERMINAL_FG_YELLOW TERMINAL_BOLD "peer" TERMINAL_RESET ": " TERMINAL_FG_YELLOW "%s" TERMINAL_RESET "\n", key(peer->public_key));
if (peer->flags & WGPEER_HAS_PRESHARED_KEY)
terminal_printf(" " TERMINAL_BOLD "preshared key" TERMINAL_RESET ": %s\n", masked_key(peer->preshared_key));
if (peer->endpoint.addr.sa_family == AF_INET || peer->endpoint.addr.sa_family == AF_INET6)
terminal_printf(" " TERMINAL_BOLD "endpoint" TERMINAL_RESET ": %s\n", endpoint(&peer->endpoint.addr));
terminal_printf(" " TERMINAL_BOLD "allowed ips" TERMINAL_RESET ": ");
if (peer->first_allowedip) {
for_each_wgallowedip(peer, allowedip)
terminal_printf("%s" TERMINAL_FG_CYAN "/" TERMINAL_RESET "%u%s", ip(allowedip), allowedip->cidr, allowedip->next_allowedip ? ", " : "\n");
} else
terminal_printf("(none)\n");
if (peer->last_handshake_time.tv_sec)
terminal_printf(" " TERMINAL_BOLD "latest handshake" TERMINAL_RESET ": %s\n", ago(&peer->last_handshake_time));
if (peer->rx_bytes || peer->tx_bytes) {
terminal_printf(" " TERMINAL_BOLD "transfer" TERMINAL_RESET ": ");
terminal_printf("%s received, ", bytes(peer->rx_bytes));
terminal_printf("%s sent\n", bytes(peer->tx_bytes));
}
if (peer->persistent_keepalive_interval)
terminal_printf(" " TERMINAL_BOLD "persistent keepalive" TERMINAL_RESET ": %s\n", every(peer->persistent_keepalive_interval));
if (peer->next_peer)
terminal_printf("\n");
}
}
static void dump_print(struct wgdevice *device, bool with_interface)
{
struct wgpeer *peer;
struct wgallowedip *allowedip;
if (with_interface)
printf("%s\t", device->name);
printf("%s\t", maybe_key(device->private_key, device->flags & WGDEVICE_HAS_PRIVATE_KEY));
printf("%s\t", maybe_key(device->public_key, device->flags & WGDEVICE_HAS_PUBLIC_KEY));
printf("%u\t", device->listen_port);
if (device->fwmark)
printf("0x%x\n", device->fwmark);
else
printf("off\n");
for_each_wgpeer(device, peer) {
if (with_interface)
printf("%s\t", device->name);
printf("%s\t", key(peer->public_key));
printf("%s\t", maybe_key(peer->preshared_key, peer->flags & WGPEER_HAS_PRESHARED_KEY));
if (peer->endpoint.addr.sa_family == AF_INET || peer->endpoint.addr.sa_family == AF_INET6)
printf("%s\t", endpoint(&peer->endpoint.addr));
else
printf("(none)\t");
if (peer->first_allowedip) {
for_each_wgallowedip(peer, allowedip)
printf("%s/%u%c", ip(allowedip), allowedip->cidr, allowedip->next_allowedip ? ',' : '\t');
} else
printf("(none)\t");
printf("%llu\t", (unsigned long long)peer->last_handshake_time.tv_sec);
printf("%" PRIu64 "\t%" PRIu64 "\t", (uint64_t)peer->rx_bytes, (uint64_t)peer->tx_bytes);
if (peer->persistent_keepalive_interval)
printf("%u\n", peer->persistent_keepalive_interval);
else
printf("off\n");
}
}
static bool ugly_print(struct wgdevice *device, const char *param, bool with_interface)
{
struct wgpeer *peer;
struct wgallowedip *allowedip;
if (!strcmp(param, "public-key")) {
if (with_interface)
printf("%s\t", device->name);
printf("%s\n", maybe_key(device->public_key, device->flags & WGDEVICE_HAS_PUBLIC_KEY));
} else if (!strcmp(param, "private-key")) {
if (with_interface)
printf("%s\t", device->name);
printf("%s\n", maybe_key(device->private_key, device->flags & WGDEVICE_HAS_PRIVATE_KEY));
} else if (!strcmp(param, "listen-port")) {
if (with_interface)
printf("%s\t", device->name);
printf("%u\n", device->listen_port);
} else if (!strcmp(param, "fwmark")) {
if (with_interface)
printf("%s\t", device->name);
if (device->fwmark)
printf("0x%x\n", device->fwmark);
else
printf("off\n");
} else if (!strcmp(param, "endpoints")) {
for_each_wgpeer(device, peer) {
if (with_interface)
printf("%s\t", device->name);
printf("%s\t", key(peer->public_key));
if (peer->endpoint.addr.sa_family == AF_INET || peer->endpoint.addr.sa_family == AF_INET6)
printf("%s\n", endpoint(&peer->endpoint.addr));
else
printf("(none)\n");
}
} else if (!strcmp(param, "allowed-ips")) {
for_each_wgpeer(device, peer) {
if (with_interface)
printf("%s\t", device->name);
printf("%s\t", key(peer->public_key));
if (peer->first_allowedip) {
for_each_wgallowedip(peer, allowedip)
printf("%s/%u%c", ip(allowedip), allowedip->cidr, allowedip->next_allowedip ? ' ' : '\n');
} else
printf("(none)\n");
}
} else if (!strcmp(param, "latest-handshakes")) {
for_each_wgpeer(device, peer) {
if (with_interface)
printf("%s\t", device->name);
printf("%s\t%llu\n", key(peer->public_key), (unsigned long long)peer->last_handshake_time.tv_sec);
}
} else if (!strcmp(param, "transfer")) {
for_each_wgpeer(device, peer) {
if (with_interface)
printf("%s\t", device->name);
printf("%s\t%" PRIu64 "\t%" PRIu64 "\n", key(peer->public_key), (uint64_t)peer->rx_bytes, (uint64_t)peer->tx_bytes);
}
} else if (!strcmp(param, "persistent-keepalive")) {
for_each_wgpeer(device, peer) {
if (with_interface)
printf("%s\t", device->name);
if (peer->persistent_keepalive_interval)
printf("%s\t%u\n", key(peer->public_key), peer->persistent_keepalive_interval);
else
printf("%s\toff\n", key(peer->public_key));
}
} else if (!strcmp(param, "preshared-keys")) {
for_each_wgpeer(device, peer) {
if (with_interface)
printf("%s\t", device->name);
printf("%s\t", key(peer->public_key));
printf("%s\n", maybe_key(peer->preshared_key, peer->flags & WGPEER_HAS_PRESHARED_KEY));
}
} else if (!strcmp(param, "peers")) {
for_each_wgpeer(device, peer) {
if (with_interface)
printf("%s\t", device->name);
printf("%s\n", key(peer->public_key));
}
} else if (!strcmp(param, "dump"))
dump_print(device, with_interface);
else {
fprintf(stderr, "Invalid parameter: `%s'\n", param);
show_usage();
return false;
}
return true;
}
int show_main(int argc, const char *argv[])
{
int ret = 0;
COMMAND_NAME = argv[0];
if (argc > 3) {
show_usage();
return 1;
}
if (argc == 1 || !strcmp(argv[1], "all")) {
char *interfaces = ipc_list_devices(), *interface;
if (!interfaces) {
perror("Unable to list interfaces");
return 1;
}
ret = !!*interfaces;
interface = interfaces;
for (size_t len = 0; (len = strlen(interface)); interface += len + 1) {
struct wgdevice *device = NULL;
if (ipc_get_device(&device, interface) < 0) {
fprintf(stderr, "Unable to access interface %s: %s\n", interface, strerror(errno));
continue;
}
if (argc == 3) {
if (!ugly_print(device, argv[2], true)) {
ret = 1;
free_wgdevice(device);
break;
}
} else {
pretty_print(device);
if (strlen(interface + len + 1))
printf("\n");
}
free_wgdevice(device);
ret = 0;
}
free(interfaces);
} else if (!strcmp(argv[1], "interfaces")) {
char *interfaces, *interface;
if (argc > 2) {
show_usage();
return 1;
}
interfaces = ipc_list_devices();
if (!interfaces) {
perror("Unable to list interfaces");
return 1;
}
interface = interfaces;
for (size_t len = 0; (len = strlen(interface)); interface += len + 1)
printf("%s%c", interface, strlen(interface + len + 1) ? ' ' : '\n');
free(interfaces);
} else if (argc == 2 && (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help") || !strcmp(argv[1], "help")))
show_usage();
else {
struct wgdevice *device = NULL;
if (ipc_get_device(&device, argv[1]) < 0) {
perror("Unable to access interface");
return 1;
}
if (argc == 3) {
if (!ugly_print(device, argv[2], false))
ret = 1;
} else
pretty_print(device);
free_wgdevice(device);
}
return ret;
}
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