1 // SPDX-License-Identifier: GPL-2.0 OR MIT
2 /*
3  * Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
4  */
5 
6 #include <arpa/inet.h>
7 #include <netinet/in.h>
8 #include <sys/socket.h>
9 #include <net/if.h>
10 #include <stddef.h>
11 #include <stdio.h>
12 #include <string.h>
13 #include <stdlib.h>
14 #include <netdb.h>
15 
16 #include "containers.h"
17 #include "encoding.h"
18 #include "ipc.h"
19 #include "subcommands.h"
20 
21 int showconf_main(int argc, const char *argv[])
22 {
23 	char base64[WG_KEY_LEN_BASE64];
24 	char ip[INET6_ADDRSTRLEN];
25 	struct wgdevice *device = NULL;
26 	struct wgpeer *peer;
27 	struct wgallowedip *allowedip;
28 	int ret = 1;
29 
30 	if (argc != 2) {
31 		fprintf(stderr, "Usage: %s %s <interface>\n", PROG_NAME, argv[0]);
32 		return 1;
33 	}
34 
35 	if (ipc_get_device(&device, argv[1])) {
36 		perror("Unable to access interface");
37 		goto cleanup;
38 	}
39 
40 	printf("[Interface]\n");
41 	if (device->listen_port)
42 		printf("ListenPort = %u\n", device->listen_port);
43 	if (device->fwmark)
44 		printf("FwMark = 0x%x\n", device->fwmark);
45 	if (device->flags & WGDEVICE_HAS_PRIVATE_KEY) {
46 		key_to_base64(base64, device->private_key);
47 		printf("PrivateKey = %s\n", base64);
48 	}
49 	printf("\n");
50 	for_each_wgpeer(device, peer) {
51 		key_to_base64(base64, peer->public_key);
52 		printf("[Peer]\nPublicKey = %s\n", base64);
53 		if (peer->flags & WGPEER_HAS_PRESHARED_KEY) {
54 			key_to_base64(base64, peer->preshared_key);
55 			printf("PresharedKey = %s\n", base64);
56 		}
57 		if (peer->first_allowedip)
58 			printf("AllowedIPs = ");
59 		for_each_wgallowedip(peer, allowedip) {
60 			if (allowedip->family == AF_INET) {
61 				if (!inet_ntop(AF_INET, &allowedip->ip4, ip, INET6_ADDRSTRLEN))
62 					continue;
63 			} else if (allowedip->family == AF_INET6) {
64 				if (!inet_ntop(AF_INET6, &allowedip->ip6, ip, INET6_ADDRSTRLEN))
65 					continue;
66 			} else
67 				continue;
68 			printf("%s/%d", ip, allowedip->cidr);
69 			if (allowedip->next_allowedip)
70 				printf(", ");
71 		}
72 		if (peer->first_allowedip)
73 			printf("\n");
74 
75 		if (peer->endpoint.addr.sa_family == AF_INET || peer->endpoint.addr.sa_family == AF_INET6) {
76 			char host[4096 + 1];
77 			char service[512 + 1];
78 			socklen_t addr_len = 0;
79 
80 			if (peer->endpoint.addr.sa_family == AF_INET)
81 				addr_len = sizeof(struct sockaddr_in);
82 			else if (peer->endpoint.addr.sa_family == AF_INET6)
83 				addr_len = sizeof(struct sockaddr_in6);
84 			if (!getnameinfo(&peer->endpoint.addr, addr_len, host, sizeof(host), service, sizeof(service), NI_DGRAM | NI_NUMERICSERV | NI_NUMERICHOST)) {
85 				if (peer->endpoint.addr.sa_family == AF_INET6 && strchr(host, ':'))
86 					printf("Endpoint = [%s]:%s\n", host, service);
87 				else
88 					printf("Endpoint = %s:%s\n", host, service);
89 			}
90 		}
91 
92 		if (peer->persistent_keepalive_interval)
93 			printf("PersistentKeepalive = %u\n", peer->persistent_keepalive_interval);
94 
95 		if (peer->next_peer)
96 			printf("\n");
97 	}
98 	ret = 0;
99 
100 cleanup:
101 	free_wgdevice(device);
102 	return ret;
103 }
104