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1 /*
2  * ip.c		"ip" utility frontend.
3  *
4  *		This program is free software; you can redistribute it and/or
5  *		modify it under the terms of the GNU General Public License
6  *		as published by the Free Software Foundation; either version
7  *		2 of the License, or (at your option) any later version.
8  *
9  * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10  */
11 
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <unistd.h>
15 #include <syslog.h>
16 #include <fcntl.h>
17 #include <sys/socket.h>
18 #include <netinet/in.h>
19 #include <string.h>
20 #include <errno.h>
21 
22 #include "SNAPSHOT.h"
23 #include "utils.h"
24 #include "ip_common.h"
25 #include "namespace.h"
26 #include "color.h"
27 
28 int preferred_family = AF_UNSPEC;
29 int human_readable;
30 int use_iec;
31 int show_stats;
32 int show_details;
33 int oneline;
34 int brief;
35 int json;
36 int timestamp;
37 const char *_SL_;
38 int force;
39 int max_flush_loops = 10;
40 int batch_mode;
41 bool do_all;
42 
43 struct rtnl_handle rth = { .fd = -1 };
44 
45 static void usage(void) __attribute__((noreturn));
46 
usage(void)47 static void usage(void)
48 {
49 	fprintf(stderr,
50 "Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }\n"
51 "       ip [ -force ] -batch filename\n"
52 "where  OBJECT := { link | address | addrlabel | route | rule | neigh | ntable |\n"
53 "                   tunnel | tuntap | maddress | mroute | mrule | monitor | xfrm |\n"
54 "                   netns | l2tp | fou | macsec | tcp_metrics | token | netconf | ila |\n"
55 "                   vrf | sr }\n"
56 "       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
57 "                    -h[uman-readable] | -iec |\n"
58 "                    -f[amily] { inet | inet6 | ipx | dnet | mpls | bridge | link } |\n"
59 "                    -4 | -6 | -I | -D | -B | -0 |\n"
60 "                    -l[oops] { maximum-addr-flush-attempts } | -br[ief] |\n"
61 "                    -o[neline] | -t[imestamp] | -ts[hort] | -b[atch] [filename] |\n"
62 "                    -rc[vbuf] [size] | -n[etns] name | -a[ll] | -c[olor]}\n");
63 	exit(-1);
64 }
65 
do_help(int argc,char ** argv)66 static int do_help(int argc, char **argv)
67 {
68 	usage();
69 	return 0;
70 }
71 
72 static const struct cmd {
73 	const char *cmd;
74 	int (*func)(int argc, char **argv);
75 } cmds[] = {
76 	{ "address",	do_ipaddr },
77 	{ "addrlabel",	do_ipaddrlabel },
78 	{ "maddress",	do_multiaddr },
79 	{ "route",	do_iproute },
80 	{ "rule",	do_iprule },
81 	{ "neighbor",	do_ipneigh },
82 	{ "neighbour",	do_ipneigh },
83 	{ "ntable",	do_ipntable },
84 	{ "ntbl",	do_ipntable },
85 	{ "link",	do_iplink },
86 	{ "l2tp",	do_ipl2tp },
87 	{ "fou",	do_ipfou },
88 	{ "ila",	do_ipila },
89 	{ "macsec",	do_ipmacsec },
90 	{ "tunnel",	do_iptunnel },
91 	{ "tunl",	do_iptunnel },
92 	{ "tuntap",	do_iptuntap },
93 	{ "tap",	do_iptuntap },
94 	{ "token",	do_iptoken },
95 	{ "tcpmetrics",	do_tcp_metrics },
96 	{ "tcp_metrics", do_tcp_metrics },
97 	{ "monitor",	do_ipmonitor },
98 	{ "xfrm",	do_xfrm },
99 	{ "mroute",	do_multiroute },
100 	{ "mrule",	do_multirule },
101 	{ "netns",	do_netns },
102 	{ "netconf",	do_ipnetconf },
103 	{ "vrf",	do_ipvrf},
104 	{ "sr",		do_seg6 },
105 	{ "help",	do_help },
106 	{ 0 }
107 };
108 
do_cmd(const char * argv0,int argc,char ** argv)109 static int do_cmd(const char *argv0, int argc, char **argv)
110 {
111 	const struct cmd *c;
112 
113 	for (c = cmds; c->cmd; ++c) {
114 		if (matches(argv0, c->cmd) == 0)
115 			return -(c->func(argc-1, argv+1));
116 	}
117 
118 	fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0);
119 	return EXIT_FAILURE;
120 }
121 
122 #ifndef ANDROID
batch(const char * name)123 static int batch(const char *name)
124 {
125 	char *line = NULL;
126 	size_t len = 0;
127 	int ret = EXIT_SUCCESS;
128 	int orig_family = preferred_family;
129 
130 	batch_mode = 1;
131 
132 	if (name && strcmp(name, "-") != 0) {
133 		if (freopen(name, "r", stdin) == NULL) {
134 			fprintf(stderr,
135 				"Cannot open file \"%s\" for reading: %s\n",
136 				name, strerror(errno));
137 			return EXIT_FAILURE;
138 		}
139 	}
140 
141 	if (rtnl_open(&rth, 0) < 0) {
142 		fprintf(stderr, "Cannot open rtnetlink\n");
143 		return EXIT_FAILURE;
144 	}
145 
146 	cmdlineno = 0;
147 	while (getcmdline(&line, &len, stdin) != -1) {
148 		char *largv[100];
149 		int largc;
150 
151 		preferred_family = orig_family;
152 
153 		largc = makeargs(line, largv, 100);
154 		if (largc == 0)
155 			continue;	/* blank line */
156 
157 		if (do_cmd(largv[0], largc, largv)) {
158 			fprintf(stderr, "Command failed %s:%d\n",
159 				name, cmdlineno);
160 			ret = EXIT_FAILURE;
161 			if (!force)
162 				break;
163 		}
164 	}
165 	if (line)
166 		free(line);
167 
168 	rtnl_close(&rth);
169 	return ret;
170 }
171 #endif
172 
173 
main(int argc,char ** argv)174 int main(int argc, char **argv)
175 {
176 	char *basename;
177 #ifndef ANDROID
178 	char *batch_file = NULL;
179 #endif
180 
181 	basename = strrchr(argv[0], '/');
182 	if (basename == NULL)
183 		basename = argv[0];
184 	else
185 		basename++;
186 
187 	while (argc > 1) {
188 		char *opt = argv[1];
189 
190 		if (strcmp(opt, "--") == 0) {
191 			argc--; argv++;
192 			break;
193 		}
194 		if (opt[0] != '-')
195 			break;
196 		if (opt[1] == '-')
197 			opt++;
198 		if (matches(opt, "-loops") == 0) {
199 			argc--;
200 			argv++;
201 			if (argc <= 1)
202 				usage();
203 			max_flush_loops = atoi(argv[1]);
204 		} else if (matches(opt, "-family") == 0) {
205 			argc--;
206 			argv++;
207 			if (argc <= 1)
208 				usage();
209 			if (strcmp(argv[1], "help") == 0)
210 				usage();
211 			else
212 				preferred_family = read_family(argv[1]);
213 			if (preferred_family == AF_UNSPEC)
214 				invarg("invalid protocol family", argv[1]);
215 		} else if (strcmp(opt, "-4") == 0) {
216 			preferred_family = AF_INET;
217 		} else if (strcmp(opt, "-6") == 0) {
218 			preferred_family = AF_INET6;
219 		} else if (strcmp(opt, "-0") == 0) {
220 			preferred_family = AF_PACKET;
221 		} else if (strcmp(opt, "-I") == 0) {
222 			preferred_family = AF_IPX;
223 		} else if (strcmp(opt, "-D") == 0) {
224 			preferred_family = AF_DECnet;
225 		} else if (strcmp(opt, "-M") == 0) {
226 			preferred_family = AF_MPLS;
227 		} else if (strcmp(opt, "-B") == 0) {
228 			preferred_family = AF_BRIDGE;
229 		} else if (matches(opt, "-human") == 0 ||
230 			   matches(opt, "-human-readable") == 0) {
231 			++human_readable;
232 		} else if (matches(opt, "-iec") == 0) {
233 			++use_iec;
234 		} else if (matches(opt, "-stats") == 0 ||
235 			   matches(opt, "-statistics") == 0) {
236 			++show_stats;
237 		} else if (matches(opt, "-details") == 0) {
238 			++show_details;
239 		} else if (matches(opt, "-resolve") == 0) {
240 			++resolve_hosts;
241 		} else if (matches(opt, "-oneline") == 0) {
242 			++oneline;
243 		} else if (matches(opt, "-timestamp") == 0) {
244 			++timestamp;
245 		} else if (matches(opt, "-tshort") == 0) {
246 			++timestamp;
247 			++timestamp_short;
248 #if 0
249 		} else if (matches(opt, "-numeric") == 0) {
250 			rtnl_names_numeric++;
251 #endif
252 		} else if (matches(opt, "-Version") == 0) {
253 			printf("ip utility, iproute2-ss%s\n", SNAPSHOT);
254 			exit(0);
255 		} else if (matches(opt, "-force") == 0) {
256 			++force;
257 #ifndef ANDROID
258 		} else if (matches(opt, "-batch") == 0) {
259 			argc--;
260 			argv++;
261 			if (argc <= 1)
262 				usage();
263 			batch_file = argv[1];
264 #endif
265 		} else if (matches(opt, "-brief") == 0) {
266 			++brief;
267 		} else if (matches(opt, "-json") == 0) {
268 			++json;
269 		} else if (matches(opt, "-rcvbuf") == 0) {
270 			unsigned int size;
271 
272 			argc--;
273 			argv++;
274 			if (argc <= 1)
275 				usage();
276 			if (get_unsigned(&size, argv[1], 0)) {
277 				fprintf(stderr, "Invalid rcvbuf size '%s'\n",
278 					argv[1]);
279 				exit(-1);
280 			}
281 			rcvbuf = size;
282 		} else if (matches(opt, "-color") == 0) {
283 			enable_color();
284 		} else if (matches(opt, "-help") == 0) {
285 			usage();
286 		} else if (matches(opt, "-netns") == 0) {
287 			NEXT_ARG();
288 			if (netns_switch(argv[1]))
289 				exit(-1);
290 		} else if (matches(opt, "-all") == 0) {
291 			do_all = true;
292 		} else {
293 			fprintf(stderr,
294 				"Option \"%s\" is unknown, try \"ip -help\".\n",
295 				opt);
296 			exit(-1);
297 		}
298 		argc--;	argv++;
299 	}
300 
301 	_SL_ = oneline ? "\\" : "\n";
302 
303 	if (json)
304 		check_if_color_enabled();
305 
306 #ifndef ANDROID
307 	if (batch_file)
308 		return batch(batch_file);
309 #endif
310 
311 	if (rtnl_open(&rth, 0) < 0)
312 		exit(1);
313 
314 	if (strlen(basename) > 2)
315 		return do_cmd(basename+2, argc, argv);
316 
317 	if (argc > 1)
318 		return do_cmd(argv[1], argc-1, argv+1);
319 
320 	rtnl_close(&rth);
321 	usage();
322 }
323