1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "sd-netlink.h"
#include "alloc-util.h"
#include "fd-util.h"
#include "firewall-util.h"
#include "in-addr-util.h"
#include "local-addresses.h"
#include "netlink-util.h"
#include "nspawn-expose-ports.h"
#include "parse-util.h"
#include "socket-util.h"
#include "string-util.h"
#include "util.h"
int expose_port_parse(ExposePort **l, const char *s) {
const char *split, *e;
uint16_t container_port, host_port;
int protocol;
ExposePort *p;
int r;
assert(l);
assert(s);
if ((e = startswith(s, "tcp:")))
protocol = IPPROTO_TCP;
else if ((e = startswith(s, "udp:")))
protocol = IPPROTO_UDP;
else {
e = s;
protocol = IPPROTO_TCP;
}
split = strchr(e, ':');
if (split) {
char v[split - e + 1];
memcpy(v, e, split - e);
v[split - e] = 0;
r = parse_ip_port(v, &host_port);
if (r < 0)
return -EINVAL;
r = parse_ip_port(split + 1, &container_port);
} else {
r = parse_ip_port(e, &container_port);
host_port = container_port;
}
if (r < 0)
return r;
LIST_FOREACH(ports, p, *l)
if (p->protocol == protocol && p->host_port == host_port)
return -EEXIST;
p = new(ExposePort, 1);
if (!p)
return -ENOMEM;
*p = (ExposePort) {
.protocol = protocol,
.host_port = host_port,
.container_port = container_port,
};
LIST_PREPEND(ports, *l, p);
return 0;
}
void expose_port_free_all(ExposePort *p) {
while (p) {
ExposePort *q = p;
LIST_REMOVE(ports, p, q);
free(q);
}
}
int expose_port_flush(FirewallContext **fw_ctx, ExposePort* l, union in_addr_union *exposed) {
ExposePort *p;
int r, af = AF_INET;
assert(exposed);
if (!l)
return 0;
if (in_addr_is_null(af, exposed))
return 0;
log_debug("Lost IP address.");
LIST_FOREACH(ports, p, l) {
r = fw_add_local_dnat(fw_ctx,
false,
af,
p->protocol,
p->host_port,
exposed,
p->container_port,
NULL);
if (r < 0)
log_warning_errno(r, "Failed to modify firewall: %m");
}
*exposed = IN_ADDR_NULL;
return 0;
}
int expose_port_execute(sd_netlink *rtnl, FirewallContext **fw_ctx, ExposePort *l, union in_addr_union *exposed) {
_cleanup_free_ struct local_address *addresses = NULL;
union in_addr_union new_exposed;
ExposePort *p;
bool add;
int af = AF_INET, r;
assert(exposed);
/* Invoked each time an address is added or removed inside the
* container */
if (!l)
return 0;
r = local_addresses(rtnl, 0, af, &addresses);
if (r < 0)
return log_error_errno(r, "Failed to enumerate local addresses: %m");
add = r > 0 &&
addresses[0].family == af &&
addresses[0].scope < RT_SCOPE_LINK;
if (!add)
return expose_port_flush(fw_ctx, l, exposed);
new_exposed = addresses[0].address;
if (in_addr_equal(af, exposed, &new_exposed))
return 0;
if (DEBUG_LOGGING) {
_cleanup_free_ char *pretty = NULL;
in_addr_to_string(af, &new_exposed, &pretty);
log_debug("New container IP is %s.", strna(pretty));
}
LIST_FOREACH(ports, p, l) {
r = fw_add_local_dnat(fw_ctx,
true,
af,
p->protocol,
p->host_port,
&new_exposed,
p->container_port,
in_addr_is_null(af, exposed) ? NULL : exposed);
if (r < 0)
log_warning_errno(r, "Failed to modify firewall: %m");
}
*exposed = new_exposed;
return 0;
}
int expose_port_send_rtnl(int send_fd) {
_cleanup_close_ int fd = -1;
int r;
assert(send_fd >= 0);
fd = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_ROUTE);
if (fd < 0)
return log_error_errno(errno, "Failed to allocate container netlink: %m");
/* Store away the fd in the socket, so that it stays open as
* long as we run the child */
r = send_one_fd(send_fd, fd, 0);
if (r < 0)
return log_error_errno(r, "Failed to send netlink fd: %m");
return 0;
}
int expose_port_watch_rtnl(
sd_event *event,
int recv_fd,
sd_netlink_message_handler_t handler,
void *userdata,
sd_netlink **ret) {
_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
int fd, r;
assert(event);
assert(recv_fd >= 0);
assert(ret);
fd = receive_one_fd(recv_fd, 0);
if (fd < 0)
return log_error_errno(fd, "Failed to recv netlink fd: %m");
r = sd_netlink_open_fd(&rtnl, fd);
if (r < 0) {
safe_close(fd);
return log_error_errno(r, "Failed to create rtnl object: %m");
}
r = sd_netlink_add_match(rtnl, NULL, RTM_NEWADDR, handler, NULL, userdata, "nspawn-NEWADDR");
if (r < 0)
return log_error_errno(r, "Failed to subscribe to RTM_NEWADDR messages: %m");
r = sd_netlink_add_match(rtnl, NULL, RTM_DELADDR, handler, NULL, userdata, "nspawn-DELADDR");
if (r < 0)
return log_error_errno(r, "Failed to subscribe to RTM_DELADDR messages: %m");
r = sd_netlink_attach_event(rtnl, event, 0);
if (r < 0)
return log_error_errno(r, "Failed to add to event loop: %m");
*ret = TAKE_PTR(rtnl);
return 0;
}
|
