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
30 int show_stats = 0;
31 int show_details = 0;
32 int show_raw = 0;
33 int resolve_hosts = 0;
34
35 static void *BODY;
36 static struct genl_util * genl_list;
37
38
print_nofopt(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)39 static 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
parse_nofopt(struct genl_util * f,int argc,char ** argv)46 static 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
get_genl_kind(const char * str)57 static struct genl_util *get_genl_kind(const 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;
83 reg:
84 f->next = genl_list;
85 genl_list = f;
86 return f;
87
88 noexist:
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
100 static void usage(void) __attribute__((noreturn));
101
usage(void)102 static 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
main(int argc,char ** argv)110 int 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