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
26int preferred_family = AF_UNSPEC;
27int show_stats = 0;
28int show_details = 0;
29int resolve_hosts = 0;
30int oneline = 0;
31int timestamp = 0;
32char * _SL_ = NULL;
33char *batch_file = NULL;
34int force = 0;
35int max_flush_loops = 10;
36
37struct rtnl_handle rth = { .fd = -1 };
38
39static void usage(void) __attribute__((noreturn));
40
41static void usage(void)
42{
43	fprintf(stderr,
44"Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }\n"
45"       ip [ -force ] -batch filename\n"
46"where  OBJECT := { link | addr | addrlabel | route | rule | neigh | ntable |\n"
47"                   tunnel | tuntap | maddr | mroute | mrule | monitor | xfrm }\n"
48"       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
49"                    -f[amily] { inet | inet6 | ipx | dnet | link } |\n"
50"                    -l[oops] { maximum-addr-flush-attempts } |\n"
51"                    -o[neline] | -t[imestamp] | -b[atch] [filename] |\n"
52"                    -rc[vbuf] [size]}\n");
53	exit(-1);
54}
55
56static int do_help(int argc, char **argv)
57{
58	usage();
59}
60
61static const struct cmd {
62	const char *cmd;
63	int (*func)(int argc, char **argv);
64} cmds[] = {
65	{ "address", 	do_ipaddr },
66	{ "addrlabel",	do_ipaddrlabel },
67	{ "maddress",	do_multiaddr },
68	{ "route",	do_iproute },
69	{ "rule",	do_iprule },
70	{ "neighbor",	do_ipneigh },
71	{ "neighbour",	do_ipneigh },
72	{ "ntable",	do_ipntable },
73	{ "ntbl",	do_ipntable },
74	{ "link",	do_iplink },
75	{ "tunnel",	do_iptunnel },
76	{ "tunl",	do_iptunnel },
77	{ "tuntap",	do_iptuntap },
78	{ "tap",	do_iptuntap },
79	{ "monitor",	do_ipmonitor },
80	{ "xfrm",	do_xfrm },
81	{ "mroute",	do_multiroute },
82	{ "mrule",	do_multirule },
83	{ "help",	do_help },
84	{ 0 }
85};
86
87static int do_cmd(const char *argv0, int argc, char **argv)
88{
89	const struct cmd *c;
90
91	for (c = cmds; c->cmd; ++c) {
92		if (matches(argv0, c->cmd) == 0)
93			return c->func(argc-1, argv+1);
94	}
95
96	fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0);
97	return -1;
98}
99
100static int batch(const char *name)
101{
102	char *line = NULL;
103	size_t len = 0;
104	int ret = 0;
105
106	if (name && strcmp(name, "-") != 0) {
107		if (freopen(name, "r", stdin) == NULL) {
108			fprintf(stderr, "Cannot open file \"%s\" for reading: %s\n",
109				name, strerror(errno));
110			return -1;
111		}
112	}
113
114	if (rtnl_open(&rth, 0) < 0) {
115		fprintf(stderr, "Cannot open rtnetlink\n");
116		return -1;
117	}
118
119	cmdlineno = 0;
120	while (getcmdline(&line, &len, stdin) != -1) {
121		char *largv[100];
122		int largc;
123
124		largc = makeargs(line, largv, 100);
125		if (largc == 0)
126			continue;	/* blank line */
127
128		if (do_cmd(largv[0], largc, largv)) {
129			fprintf(stderr, "Command failed %s:%d\n", name, cmdlineno);
130			ret = 1;
131			if (!force)
132				break;
133		}
134	}
135	if (line)
136		free(line);
137
138	rtnl_close(&rth);
139	return ret;
140}
141
142
143int main(int argc, char **argv)
144{
145	char *basename;
146
147	basename = strrchr(argv[0], '/');
148	if (basename == NULL)
149		basename = argv[0];
150	else
151		basename++;
152
153	while (argc > 1) {
154		char *opt = argv[1];
155		if (strcmp(opt,"--") == 0) {
156			argc--; argv++;
157			break;
158		}
159		if (opt[0] != '-')
160			break;
161		if (opt[1] == '-')
162			opt++;
163		if (matches(opt, "-loops") == 0) {
164			argc--;
165			argv++;
166			if (argc <= 1)
167				usage();
168                        max_flush_loops = atoi(argv[1]);
169                } else if (matches(opt, "-family") == 0) {
170			argc--;
171			argv++;
172			if (argc <= 1)
173				usage();
174			if (strcmp(argv[1], "inet") == 0)
175				preferred_family = AF_INET;
176			else if (strcmp(argv[1], "inet6") == 0)
177				preferred_family = AF_INET6;
178			else if (strcmp(argv[1], "dnet") == 0)
179				preferred_family = AF_DECnet;
180			else if (strcmp(argv[1], "link") == 0)
181				preferred_family = AF_PACKET;
182			else if (strcmp(argv[1], "ipx") == 0)
183				preferred_family = AF_IPX;
184			else if (strcmp(argv[1], "help") == 0)
185				usage();
186			else
187				invarg(argv[1], "invalid protocol family");
188		} else if (strcmp(opt, "-4") == 0) {
189			preferred_family = AF_INET;
190		} else if (strcmp(opt, "-6") == 0) {
191			preferred_family = AF_INET6;
192		} else if (strcmp(opt, "-0") == 0) {
193			preferred_family = AF_PACKET;
194		} else if (strcmp(opt, "-I") == 0) {
195			preferred_family = AF_IPX;
196		} else if (strcmp(opt, "-D") == 0) {
197			preferred_family = AF_DECnet;
198		} else if (matches(opt, "-stats") == 0 ||
199			   matches(opt, "-statistics") == 0) {
200			++show_stats;
201		} else if (matches(opt, "-details") == 0) {
202			++show_details;
203		} else if (matches(opt, "-resolve") == 0) {
204			++resolve_hosts;
205		} else if (matches(opt, "-oneline") == 0) {
206			++oneline;
207		} else if (matches(opt, "-timestamp") == 0) {
208			++timestamp;
209#if 0
210		} else if (matches(opt, "-numeric") == 0) {
211			rtnl_names_numeric++;
212#endif
213		} else if (matches(opt, "-Version") == 0) {
214			printf("ip utility, iproute2-ss%s\n", SNAPSHOT);
215			exit(0);
216		} else if (matches(opt, "-force") == 0) {
217			++force;
218		} else if (matches(opt, "-batch") == 0) {
219			argc--;
220			argv++;
221			if (argc <= 1)
222				usage();
223			batch_file = argv[1];
224		} else if (matches(opt, "-rcvbuf") == 0) {
225			unsigned int size;
226
227			argc--;
228			argv++;
229			if (argc <= 1)
230				usage();
231			if (get_unsigned(&size, argv[1], 0)) {
232				fprintf(stderr, "Invalid rcvbuf size '%s'\n",
233					argv[1]);
234				exit(-1);
235			}
236			rcvbuf = size;
237		} else if (matches(opt, "-help") == 0) {
238			usage();
239		} else {
240			fprintf(stderr, "Option \"%s\" is unknown, try \"ip -help\".\n", opt);
241			exit(-1);
242		}
243		argc--;	argv++;
244	}
245
246	_SL_ = oneline ? "\\" : "\n" ;
247
248	if (batch_file)
249		return batch(batch_file);
250
251	if (rtnl_open(&rth, 0) < 0)
252		exit(1);
253
254	if (strlen(basename) > 2)
255		return do_cmd(basename+2, argc, argv);
256
257	if (argc > 1)
258		return do_cmd(argv[1], argc-1, argv+1);
259
260	rtnl_close(&rth);
261	usage();
262}
263