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