tincctl: restrict umask argument for FORTIFY
[tinc] / src / info.c
1 /*
2     info.c -- Show information about a node, subnet or address
3     Copyright (C) 2012-2017 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
22 #include "control_common.h"
23 #include "list.h"
24 #include "subnet.h"
25 #include "tincctl.h"
26 #include "info.h"
27 #include "utils.h"
28 #include "xalloc.h"
29
30 void logger(int level, int priority, const char *format, ...) {
31         (void)level;
32         (void)priority;
33         va_list ap;
34
35         va_start(ap, format);
36         vfprintf(stderr, format, ap);
37         va_end(ap);
38
39         fputc('\n', stderr);
40 }
41
42 char *strip_weight(char *netstr) {
43         int len = strlen(netstr);
44
45         if(len >= 3 && !strcmp(netstr + len - 3, "#10")) {
46                 netstr[len - 3] = 0;
47         }
48
49         return netstr;
50 }
51
52 static int info_node(int fd, const char *item) {
53         // Check the list of nodes
54         sendline(fd, "%d %d %s", CONTROL, REQ_DUMP_NODES, item);
55
56         bool found = false;
57         char line[4096];
58
59         char node[4096];
60         char id[4096];
61         char from[4096];
62         char to[4096];
63         char subnet[4096];
64         char host[4096];
65         char port[4096];
66         char via[4096];
67         char nexthop[4096];
68         int code, req, cipher, digest, maclength, compression, distance;
69         short int pmtu, minmtu, maxmtu;
70         unsigned int options;
71         union {
72                 node_status_t bits;
73                 uint32_t raw;
74         } status_union;
75         node_status_t status;
76         long int last_state_change;
77         int udp_ping_rtt;
78         uint64_t in_packets, in_bytes, out_packets, out_bytes;
79
80         while(recvline(fd, line, sizeof(line))) {
81                 int n = sscanf(line, "%d %d %4095s %4095s %4095s port %4095s %d %d %d %d %x %"PRIx32" %4095s %4095s %d %hd %hd %hd %ld %d %"PRIu64" %"PRIu64" %"PRIu64" %"PRIu64, &code, &req, node, id, host, port, &cipher, &digest, &maclength, &compression, &options, &status_union.raw, nexthop, via, &distance, &pmtu, &minmtu, &maxmtu, &last_state_change, &udp_ping_rtt, &in_packets, &in_bytes, &out_packets, &out_bytes);
82
83                 if(n == 2) {
84                         break;
85                 }
86
87                 if(n != 24) {
88                         fprintf(stderr, "Unable to parse node dump from tincd.\n");
89                         return 1;
90                 }
91
92                 if(!strcmp(node, item)) {
93                         found = true;
94                         break;
95                 }
96         }
97
98         if(!found) {
99                 fprintf(stderr, "Unknown node %s.\n", item);
100                 return 1;
101         }
102
103         while(recvline(fd, line, sizeof(line))) {
104                 if(sscanf(line, "%d %d %4095s", &code, &req, node) == 2) {
105                         break;
106                 }
107         }
108
109         printf("Node:         %s\n", item);
110         printf("Node ID:      %s\n", id);
111         printf("Address:      %s port %s\n", host, port);
112
113         char timestr[32] = "never";
114         time_t lsc_time = last_state_change;
115
116         if(last_state_change) {
117                 strftime(timestr, sizeof(timestr), "%Y-%m-%d %H:%M:%S", localtime(&lsc_time));
118         }
119
120         status = status_union.bits;
121
122         if(status.reachable) {
123                 printf("Online since: %s\n", timestr);
124         } else {
125                 printf("Last seen:    %s\n", timestr);
126         }
127
128         printf("Status:      ");
129
130         if(status.validkey) {
131                 printf(" validkey");
132         }
133
134         if(status.visited) {
135                 printf(" visited");
136         }
137
138         if(status.reachable) {
139                 printf(" reachable");
140         }
141
142         if(status.indirect) {
143                 printf(" indirect");
144         }
145
146         if(status.sptps) {
147                 printf(" sptps");
148         }
149
150         if(status.udp_confirmed) {
151                 printf(" udp_confirmed");
152         }
153
154         printf("\n");
155
156         printf("Options:     ");
157
158         if(options & OPTION_INDIRECT) {
159                 printf(" indirect");
160         }
161
162         if(options & OPTION_TCPONLY) {
163                 printf(" tcponly");
164         }
165
166         if(options & OPTION_PMTU_DISCOVERY) {
167                 printf(" pmtu_discovery");
168         }
169
170         if(options & OPTION_CLAMP_MSS) {
171                 printf(" clamp_mss");
172         }
173
174         printf("\n");
175         printf("Protocol:     %d.%d\n", PROT_MAJOR, OPTION_VERSION(options));
176         printf("Reachability: ");
177
178         if(!strcmp(host, "MYSELF")) {
179                 printf("can reach itself\n");
180         } else if(!status.reachable) {
181                 printf("unreachable\n");
182         } else if(strcmp(via, item)) {
183                 printf("indirectly via %s\n", via);
184         } else if(!status.validkey) {
185                 printf("unknown\n");
186         } else if(minmtu > 0) {
187                 printf("directly with UDP\nPMTU:         %d\n", pmtu);
188
189                 if(udp_ping_rtt != -1) {
190                         printf("RTT:          %d.%03d\n", udp_ping_rtt / 1000, udp_ping_rtt % 1000);
191                 }
192         } else if(!strcmp(nexthop, item)) {
193                 printf("directly with TCP\n");
194         } else {
195                 printf("none, forwarded via %s\n", nexthop);
196         }
197
198         printf("RX:           %"PRIu64" packets  %"PRIu64" bytes\n", in_packets, in_bytes);
199         printf("TX:           %"PRIu64" packets  %"PRIu64" bytes\n", out_packets, out_bytes);
200
201         // List edges
202         printf("Edges:       ");
203         sendline(fd, "%d %d %s", CONTROL, REQ_DUMP_EDGES, item);
204
205         while(recvline(fd, line, sizeof(line))) {
206                 int n = sscanf(line, "%d %d %4095s %4095s", &code, &req, from, to);
207
208                 if(n == 2) {
209                         break;
210                 }
211
212                 if(n != 4) {
213                         fprintf(stderr, "Unable to parse edge dump from tincd.\n%s\n", line);
214                         return 1;
215                 }
216
217                 if(!strcmp(from, item)) {
218                         printf(" %s", to);
219                 }
220         }
221
222         printf("\n");
223
224         // List subnets
225         printf("Subnets:     ");
226         sendline(fd, "%d %d %s", CONTROL, REQ_DUMP_SUBNETS, item);
227
228         while(recvline(fd, line, sizeof(line))) {
229                 int n = sscanf(line, "%d %d %4095s %4095s", &code, &req, subnet, from);
230
231                 if(n == 2) {
232                         break;
233                 }
234
235                 if(n != 4) {
236                         fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
237                         return 1;
238                 }
239
240                 if(!strcmp(from, item)) {
241                         printf(" %s", strip_weight(subnet));
242                 }
243         }
244
245         printf("\n");
246
247         return 0;
248 }
249
250 static int info_subnet(int fd, const char *item) {
251         subnet_t subnet, find;
252
253         if(!str2net(&find, item)) {
254                 fprintf(stderr, "Could not parse subnet or address '%s'.\n", item);
255                 return 1;
256         }
257
258         bool address = !strchr(item, '/');
259         bool weight = strchr(item, '#');
260         bool found = false;
261
262         char line[4096];
263         char netstr[4096];
264         char owner[4096];
265
266         int code, req;
267
268         sendline(fd, "%d %d %s", CONTROL, REQ_DUMP_SUBNETS, item);
269
270         while(recvline(fd, line, sizeof(line))) {
271                 int n = sscanf(line, "%d %d %4095s %4095s", &code, &req, netstr, owner);
272
273                 if(n == 2) {
274                         break;
275                 }
276
277                 if(n != 4 || !str2net(&subnet, netstr)) {
278                         fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
279                         return 1;
280                 }
281
282                 if(find.type != subnet.type) {
283                         continue;
284                 }
285
286                 if(weight) {
287                         if(find.weight != subnet.weight) {
288                                 continue;
289                         }
290                 }
291
292                 if(find.type == SUBNET_IPV4) {
293                         if(address) {
294                                 if(maskcmp(&find.net.ipv4.address, &subnet.net.ipv4.address, subnet.net.ipv4.prefixlength)) {
295                                         continue;
296                                 }
297                         } else {
298                                 if(find.net.ipv4.prefixlength != subnet.net.ipv4.prefixlength) {
299                                         continue;
300                                 }
301
302                                 if(memcmp(&find.net.ipv4.address, &subnet.net.ipv4.address, sizeof(subnet.net.ipv4))) {
303                                         continue;
304                                 }
305                         }
306                 } else if(find.type == SUBNET_IPV6) {
307                         if(address) {
308                                 if(maskcmp(&find.net.ipv6.address, &subnet.net.ipv6.address, subnet.net.ipv6.prefixlength)) {
309                                         continue;
310                                 }
311                         } else {
312                                 if(find.net.ipv6.prefixlength != subnet.net.ipv6.prefixlength) {
313                                         continue;
314                                 }
315
316                                 if(memcmp(&find.net.ipv6.address, &subnet.net.ipv6.address, sizeof(subnet.net.ipv6))) {
317                                         continue;
318                                 }
319                         }
320                 }
321
322                 if(find.type == SUBNET_MAC) {
323                         if(memcmp(&find.net.mac.address, &subnet.net.mac.address, sizeof(subnet.net.mac))) {
324                                 continue;
325                         }
326                 }
327
328                 found = true;
329                 printf("Subnet: %s\n", strip_weight(netstr));
330                 printf("Owner:  %s\n", owner);
331         }
332
333         if(!found) {
334                 if(address) {
335                         fprintf(stderr, "Unknown address %s.\n", item);
336                 } else {
337                         fprintf(stderr, "Unknown subnet %s.\n", item);
338                 }
339
340                 return 1;
341         }
342
343         return 0;
344 }
345
346 int info(int fd, const char *item) {
347         if(check_id(item)) {
348                 return info_node(fd, item);
349         }
350
351         if(strchr(item, '.') || strchr(item, ':')) {
352                 return info_subnet(fd, item);
353         }
354
355         fprintf(stderr, "Argument is not a node name, subnet or address.\n");
356         return 1;
357 }