1/*
2 * genl.c		"genl" 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:	Jamal Hadi Salim
10 *
11 */
12
13#include <stdio.h>
14#include <stdlib.h>
15#include <unistd.h>
16#include <syslog.h>
17#include <fcntl.h>
18#include <dlfcn.h>
19#include <sys/socket.h>
20#include <netinet/in.h>
21#include <arpa/inet.h>
22#include <string.h>
23#include <errno.h>
24#include <linux/netlink.h>
25#include <linux/rtnetlink.h> /* until we put our own header */
26#include "SNAPSHOT.h"
27#include "utils.h"
28#include "genl_utils.h"
29
30int show_stats = 0;
31int show_details = 0;
32int show_raw = 0;
33int resolve_hosts = 0;
34
35static void *BODY;
36static struct genl_util * genl_list;
37
38
39static int print_nofopt(const struct sockaddr_nl *who, struct nlmsghdr *n,
40			void *arg)
41{
42	fprintf((FILE *) arg, "unknown genl type ..\n");
43	return 0;
44}
45
46static int parse_nofopt(struct genl_util *f, int argc, char **argv)
47{
48	if (argc) {
49		fprintf(stderr, "Unknown genl \"%s\", hence option \"%s\" "
50			"is unparsable\n", f->name, *argv);
51		return -1;
52	}
53
54	return 0;
55}
56
57static struct genl_util *get_genl_kind(char *str)
58{
59	void *dlh;
60	char buf[256];
61	struct genl_util *f;
62
63	for (f = genl_list; f; f = f->next)
64		if (strcmp(f->name, str) == 0)
65			return f;
66
67	snprintf(buf, sizeof(buf), "%s.so", str);
68	dlh = dlopen(buf, RTLD_LAZY);
69	if (dlh == NULL) {
70		dlh = BODY;
71		if (dlh == NULL) {
72			dlh = BODY = dlopen(NULL, RTLD_LAZY);
73			if (dlh == NULL)
74				goto noexist;
75		}
76	}
77
78	snprintf(buf, sizeof(buf), "%s_genl_util", str);
79
80	f = dlsym(dlh, buf);
81	if (f == NULL)
82		goto noexist;
83reg:
84	f->next = genl_list;
85	genl_list = f;
86	return f;
87
88noexist:
89	f = malloc(sizeof(*f));
90	if (f) {
91		memset(f, 0, sizeof(*f));
92		strncpy(f->name, str, 15);
93		f->parse_genlopt = parse_nofopt;
94		f->print_genlopt = print_nofopt;
95		goto reg;
96	}
97	return f;
98}
99
100static void usage(void) __attribute__((noreturn));
101
102static void usage(void)
103{
104	fprintf(stderr, "Usage: genl [ OPTIONS ] OBJECT | help }\n"
105	                "where  OBJECT := { ctrl etc }\n"
106	                "       OPTIONS := { -s[tatistics] | -d[etails] | -r[aw] }\n");
107	exit(-1);
108}
109
110int main(int argc, char **argv)
111{
112	while (argc > 1) {
113		if (argv[1][0] != '-')
114			break;
115		if (matches(argv[1], "-stats") == 0 ||
116		    matches(argv[1], "-statistics") == 0) {
117			++show_stats;
118		} else if (matches(argv[1], "-details") == 0) {
119			++show_details;
120		} else if (matches(argv[1], "-raw") == 0) {
121			++show_raw;
122		} else if (matches(argv[1], "-Version") == 0) {
123			printf("genl utility, iproute2-ss%s\n", SNAPSHOT);
124			exit(0);
125		} else if (matches(argv[1], "-help") == 0) {
126			usage();
127		} else {
128			fprintf(stderr, "Option \"%s\" is unknown, try "
129				"\"genl -help\".\n", argv[1]);
130			exit(-1);
131		}
132		argc--;	argv++;
133	}
134
135	if (argc > 1) {
136		int ret;
137		struct genl_util *a = NULL;
138		a = get_genl_kind(argv[1]);
139		if (!a) {
140			fprintf(stderr,"bad genl %s\n", argv[1]);
141			exit(-1);
142		}
143
144		ret = a->parse_genlopt(a, argc-1, argv+1);
145		return ret;
146	}
147
148	usage();
149}
150