Have tincd and tincctl use the same method of determining netname.
[tinc] / src / control.c
1 /*
2     control.c -- Control socket handling.
3     Copyright (C) 2012 Guus Sliepen <guus@tinc-vpn.org>
4
5     This program is free software; you can redistribute it and/or modify
6     it under the terms of the GNU General Public License as published by
7     the Free Software Foundation; either version 2 of the License, or
8     (at your option) any later version.
9
10     This program is distributed in the hope that it will be useful,
11     but WITHOUT ANY WARRANTY; without even the implied warranty of
12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13     GNU General Public License for more details.
14
15     You should have received a copy of the GNU General Public License along
16     with this program; if not, write to the Free Software Foundation, Inc.,
17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #include "system.h"
21 #include "crypto.h"
22 #include "conf.h"
23 #include "control.h"
24 #include "control_common.h"
25 #include "graph.h"
26 #include "logger.h"
27 #include "meta.h"
28 #include "net.h"
29 #include "netutl.h"
30 #include "protocol.h"
31 #include "route.h"
32 #include "splay_tree.h"
33 #include "utils.h"
34 #include "xalloc.h"
35
36 char controlcookie[65];
37 extern char *pidfilename;
38
39 static bool control_return(connection_t *c, int type, int error) {
40         return send_request(c, "%d %d %d", CONTROL, type, error);
41 }
42
43 static bool control_ok(connection_t *c, int type) {
44         return control_return(c, type, 0);
45 }
46
47 bool control_h(connection_t *c, const char *request) {
48         int type;
49
50         if(!c->status.control || c->allow_request != CONTROL) {
51                 logger(DEBUG_ALWAYS, LOG_ERR, "Unauthorized control request from %s (%s)", c->name, c->hostname);
52                 return false;
53         }
54
55         if(sscanf(request, "%*d %d", &type) != 1) {
56                 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CONTROL", c->name, c->hostname);
57                 return false;
58         }
59
60         switch (type) {
61                 case REQ_STOP:
62                         event_loopexit(NULL);
63                         return control_ok(c, REQ_STOP);
64
65                 case REQ_DUMP_NODES:
66                         return dump_nodes(c);
67                         
68                 case REQ_DUMP_EDGES:
69                         return dump_edges(c);
70
71                 case REQ_DUMP_SUBNETS:
72                         return dump_subnets(c);
73
74                 case REQ_DUMP_CONNECTIONS:
75                         return dump_connections(c);
76
77                 case REQ_PURGE:
78                         purge();
79                         return control_ok(c, REQ_PURGE);
80
81                 case REQ_SET_DEBUG: {
82                         int new_level;
83                         if(sscanf(request, "%*d %*d %d", &new_level) != 1)
84                                 return false;
85                         send_request(c, "%d %d %d", CONTROL, REQ_SET_DEBUG, debug_level);
86                         if(new_level >= 0)
87                                 debug_level = new_level;
88                         return true;
89                 }
90
91                 case REQ_RETRY:
92                         retry();
93                         return control_ok(c, REQ_RETRY);
94
95                 case REQ_RELOAD:
96                         logger(DEBUG_ALWAYS, LOG_NOTICE, "Got '%s' command", "reload");
97                         int result = reload_configuration();
98                         return control_return(c, REQ_RELOAD, result);
99
100                 case REQ_DISCONNECT: {
101                         char name[MAX_STRING_SIZE];
102                         connection_t *other;
103                         splay_node_t *node, *next;
104                         bool found = false;
105
106                         if(sscanf(request, "%*d %*d " MAX_STRING, name) != 1)
107                                 return control_return(c, REQ_DISCONNECT, -1);
108
109                         for(node = connection_tree->head; node; node = next) {
110                                 next = node->next;
111                                 other = node->data;
112                                 if(strcmp(other->name, name))
113                                         continue;
114                                 terminate_connection(other, other->status.active);
115                                 found = true;
116                         }
117
118                         return control_return(c, REQ_DISCONNECT, found ? 0 : -2);
119                 }
120
121                 case REQ_DUMP_TRAFFIC:
122                         return dump_traffic(c);
123
124                 case REQ_PCAP:
125                         sscanf(request, "%*d %*d %d", &c->outmaclength);
126                         c->status.pcap = true;
127                         pcap = true;
128                         return true;
129
130                 case REQ_LOG:
131                         sscanf(request, "%*d %*d %d", &c->outcompression);
132                         c->status.log = true;
133                         logcontrol = true;
134                         return true;
135
136                 default:
137                         return send_request(c, "%d %d", CONTROL, REQ_INVALID);
138         }
139 }
140
141 bool init_control(void) {
142         randomize(controlcookie, sizeof controlcookie / 2);
143         bin2hex(controlcookie, controlcookie, sizeof controlcookie / 2);
144
145         FILE *f = fopen(pidfilename, "w");
146         if(!f) {
147                 logger(DEBUG_ALWAYS, LOG_ERR, "Cannot write control socket cookie file %s: %s", pidfilename, strerror(errno));
148                 return false;
149         }
150
151 #ifdef HAVE_FCHMOD
152         fchmod(fileno(f), 0600);
153 #else
154         chmod(pidfilename, 0600);
155 #endif
156         // Get the address and port of the first listening socket
157
158         char *localhost = NULL;
159         sockaddr_t sa;
160         socklen_t len = sizeof sa;
161
162         // Make sure we have a valid address, and map 0.0.0.0 and :: to 127.0.0.1 and ::1.
163
164         if(getsockname(listen_socket[0].tcp, (struct sockaddr *)&sa, &len)) {
165                 xasprintf(&localhost, "127.0.0.1 port %d", myport);
166         } else {
167                 if(sa.sa.sa_family == AF_INET) {
168                         if(sa.in.sin_addr.s_addr == 0)
169                                 sa.in.sin_addr.s_addr = htonl(0x7f000001);
170                 } else if(sa.sa.sa_family == AF_INET6) {
171                         static const uint8_t zero[16] = {0};
172                         if(!memcmp(sa.in6.sin6_addr.s6_addr, zero, sizeof zero))
173                                 sa.in6.sin6_addr.s6_addr[15] = 1;
174                 }
175
176                 localhost = sockaddr2hostname(&sa);
177         }
178
179         fprintf(f, "%d %s %s\n", (int)getpid(), controlcookie, localhost);
180
181         free(localhost);
182         fclose(f);
183
184         return true;
185 }
186
187 void exit_control(void) {
188         unlink(pidfilename);
189 }