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wireguard-tools
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wireguard-tools/src/ipc-uapi.h

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// SPDX-License-Identifier: MIT
/*
* Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include <arpa/inet.h>
#include <errno.h>
#include <limits.h>
#include <net/if.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include "containers.h"
#include "curve25519.h"
#include "encoding.h"
#include "ctype.h"
#ifdef _WIN32
#include "ipc-uapi-windows.h"
#else
#include "ipc-uapi-unix.h"
#endif
static int userspace_set_device(struct wgdevice *dev)
{
char hex[WG_KEY_LEN_HEX], ip[INET6_ADDRSTRLEN], host[4096 + 1], service[512 + 1];
struct wgpeer *peer;
struct wgallowedip *allowedip;
FILE *f;
int ret, set_errno = -EPROTO;
socklen_t addr_len;
size_t line_buffer_len = 0, line_len;
char *key = NULL, *value;
f = userspace_interface_file(dev->name);
if (!f)
return -errno;
fprintf(f, "set=1\n");
if (dev->flags & WGDEVICE_HAS_PRIVATE_KEY) {
key_to_hex(hex, dev->private_key);
fprintf(f, "private_key=%s\n", hex);
}
if (dev->flags & WGDEVICE_HAS_LISTEN_PORT)
fprintf(f, "listen_port=%u\n", dev->listen_port);
if (dev->flags & WGDEVICE_HAS_FWMARK)
fprintf(f, "fwmark=%u\n", dev->fwmark);
if (dev->flags & WGDEVICE_REPLACE_PEERS)
fprintf(f, "replace_peers=true\n");
for_each_wgpeer(dev, peer) {
key_to_hex(hex, peer->public_key);
fprintf(f, "public_key=%s\n", hex);
if (peer->flags & WGPEER_REMOVE_ME) {
fprintf(f, "remove=true\n");
continue;
}
if (peer->flags & WGPEER_HAS_PRESHARED_KEY) {
key_to_hex(hex, peer->preshared_key);
fprintf(f, "preshared_key=%s\n", hex);
}
if (peer->endpoint.addr.sa_family == AF_INET || peer->endpoint.addr.sa_family == AF_INET6) {
addr_len = 0;
if (peer->endpoint.addr.sa_family == AF_INET)
addr_len = sizeof(struct sockaddr_in);
else if (peer->endpoint.addr.sa_family == AF_INET6)
addr_len = sizeof(struct sockaddr_in6);
if (!getnameinfo(&peer->endpoint.addr, addr_len, host, sizeof(host), service, sizeof(service), NI_DGRAM | NI_NUMERICSERV | NI_NUMERICHOST)) {
if (peer->endpoint.addr.sa_family == AF_INET6 && strchr(host, ':'))
fprintf(f, "endpoint=[%s]:%s\n", host, service);
else
fprintf(f, "endpoint=%s:%s\n", host, service);
}
}
if (peer->flags & WGPEER_HAS_PERSISTENT_KEEPALIVE_INTERVAL)
fprintf(f, "persistent_keepalive_interval=%u\n", peer->persistent_keepalive_interval);
if (peer->flags & WGPEER_REPLACE_ALLOWEDIPS)
fprintf(f, "replace_allowed_ips=true\n");
for_each_wgallowedip(peer, allowedip) {
if (allowedip->family == AF_INET) {
if (!inet_ntop(AF_INET, &allowedip->ip4, ip, INET6_ADDRSTRLEN))
continue;
} else if (allowedip->family == AF_INET6) {
if (!inet_ntop(AF_INET6, &allowedip->ip6, ip, INET6_ADDRSTRLEN))
continue;
} else
continue;
fprintf(f, "allowed_ip=%s/%d\n", ip, allowedip->cidr);
}
}
fprintf(f, "\n");
fflush(f);
while (getline(&key, &line_buffer_len, f) > 0) {
line_len = strlen(key);
ret = set_errno;
if (line_len == 1 && key[0] == '\n')
goto out;
value = strchr(key, '=');
if (!value || line_len == 0 || key[line_len - 1] != '\n')
break;
*value++ = key[--line_len] = '\0';
if (!strcmp(key, "errno")) {
long long num;
char *end;
if (value[0] != '-' && !char_is_digit(value[0]))
break;
num = strtoll(value, &end, 10);
if (*end || num > INT_MAX || num < INT_MIN)
break;
set_errno = num;
}
}
ret = errno ? -errno : -EPROTO;
out:
free(key);
fclose(f);
errno = -ret;
return ret;
}
#define NUM(max) ({ \
unsigned long long num; \
char *end; \
if (!char_is_digit(value[0])) \
break; \
num = strtoull(value, &end, 10); \
if (*end || num > max) \
break; \
num; \
})
static int userspace_get_device(struct wgdevice **out, const char *iface)
{
struct wgdevice *dev;
struct wgpeer *peer = NULL;
struct wgallowedip *allowedip = NULL;
size_t line_buffer_len = 0, line_len;
char *key = NULL, *value;
FILE *f;
int ret = -EPROTO;
*out = dev = calloc(1, sizeof(*dev));
if (!dev)
return -errno;
f = userspace_interface_file(iface);
if (!f) {
ret = -errno;
free(dev);
*out = NULL;
return ret;
}
fprintf(f, "get=1\n\n");
fflush(f);
strncpy(dev->name, iface, IFNAMSIZ - 1);
dev->name[IFNAMSIZ - 1] = '\0';
while (getline(&key, &line_buffer_len, f) > 0) {
line_len = strlen(key);
if (line_len == 1 && key[0] == '\n')
goto err;
value = strchr(key, '=');
if (!value || line_len == 0 || key[line_len - 1] != '\n')
break;
*value++ = key[--line_len] = '\0';
if (!peer && !strcmp(key, "private_key")) {
if (!key_from_hex(dev->private_key, value))
break;
curve25519_generate_public(dev->public_key, dev->private_key);
dev->flags |= WGDEVICE_HAS_PRIVATE_KEY | WGDEVICE_HAS_PUBLIC_KEY;
} else if (!peer && !strcmp(key, "listen_port")) {
dev->listen_port = NUM(0xffffU);
dev->flags |= WGDEVICE_HAS_LISTEN_PORT;
} else if (!peer && !strcmp(key, "fwmark")) {
dev->fwmark = NUM(0xffffffffU);
dev->flags |= WGDEVICE_HAS_FWMARK;
} else if (!strcmp(key, "public_key")) {
struct wgpeer *new_peer = calloc(1, sizeof(*new_peer));
if (!new_peer) {
ret = -ENOMEM;
goto err;
}
allowedip = NULL;
if (peer)
peer->next_peer = new_peer;
else
dev->first_peer = new_peer;
peer = new_peer;
if (!key_from_hex(peer->public_key, value))
break;
peer->flags |= WGPEER_HAS_PUBLIC_KEY;
} else if (peer && !strcmp(key, "preshared_key")) {
if (!key_from_hex(peer->preshared_key, value))
break;
if (!key_is_zero(peer->preshared_key))
peer->flags |= WGPEER_HAS_PRESHARED_KEY;
} else if (peer && !strcmp(key, "endpoint")) {
char *begin, *end;
struct addrinfo *resolved;
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_DGRAM,
.ai_protocol = IPPROTO_UDP
};
if (!strlen(value))
break;
if (value[0] == '[') {
begin = &value[1];
end = strchr(value, ']');
if (!end)
break;
*end++ = '\0';
if (*end++ != ':' || !*end)
break;
} else {
begin = value;
end = strrchr(value, ':');
if (!end || !*(end + 1))
break;
*end++ = '\0';
}
if (getaddrinfo(begin, end, &hints, &resolved) != 0) {
ret = ENETUNREACH;
goto err;
}
if ((resolved->ai_family == AF_INET && resolved->ai_addrlen == sizeof(struct sockaddr_in)) ||
(resolved->ai_family == AF_INET6 && resolved->ai_addrlen == sizeof(struct sockaddr_in6)))
memcpy(&peer->endpoint.addr, resolved->ai_addr, resolved->ai_addrlen);
else {
freeaddrinfo(resolved);
break;
}
freeaddrinfo(resolved);
} else if (peer && !strcmp(key, "persistent_keepalive_interval")) {
peer->persistent_keepalive_interval = NUM(0xffffU);
peer->flags |= WGPEER_HAS_PERSISTENT_KEEPALIVE_INTERVAL;
} else if (peer && !strcmp(key, "allowed_ip")) {
struct wgallowedip *new_allowedip;
char *end, *mask = value, *ip = strsep(&mask, "/");
if (!mask || !char_is_digit(mask[0]))
break;
new_allowedip = calloc(1, sizeof(*new_allowedip));
if (!new_allowedip) {
ret = -ENOMEM;
goto err;
}
if (allowedip)
allowedip->next_allowedip = new_allowedip;
else
peer->first_allowedip = new_allowedip;
allowedip = new_allowedip;
allowedip->family = AF_UNSPEC;
if (strchr(ip, ':')) {
if (inet_pton(AF_INET6, ip, &allowedip->ip6) == 1)
allowedip->family = AF_INET6;
} else {
if (inet_pton(AF_INET, ip, &allowedip->ip4) == 1)
allowedip->family = AF_INET;
}
allowedip->cidr = strtoul(mask, &end, 10);
if (*end || allowedip->family == AF_UNSPEC || (allowedip->family == AF_INET6 && allowedip->cidr > 128) || (allowedip->family == AF_INET && allowedip->cidr > 32))
break;
} else if (peer && !strcmp(key, "last_handshake_time_sec"))
peer->last_handshake_time.tv_sec = NUM(0x7fffffffffffffffULL);
else if (peer && !strcmp(key, "last_handshake_time_nsec"))
peer->last_handshake_time.tv_nsec = NUM(0x7fffffffffffffffULL);
else if (peer && !strcmp(key, "rx_bytes"))
peer->rx_bytes = NUM(0xffffffffffffffffULL);
else if (peer && !strcmp(key, "tx_bytes"))
peer->tx_bytes = NUM(0xffffffffffffffffULL);
else if (!strcmp(key, "errno"))
ret = -NUM(0x7fffffffU);
}
ret = -EPROTO;
err:
free(key);
if (ret) {
free_wgdevice(dev);
*out = NULL;
}
fclose(f);
errno = -ret;
return ret;
}
#undef NUM
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