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
34 static void *BODY;
35 static struct genl_util * genl_list;
36
37
print_nofopt(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)38 static int print_nofopt(const struct sockaddr_nl *who, struct nlmsghdr *n,
39 void *arg)
40 {
41 fprintf((FILE *) arg, "unknown genl type ..\n");
42 return 0;
43 }
44
parse_nofopt(struct genl_util * f,int argc,char ** argv)45 static int parse_nofopt(struct genl_util *f, int argc, char **argv)
46 {
47 if (argc) {
48 fprintf(stderr, "Unknown genl \"%s\", hence option \"%s\" "
49 "is unparsable\n", f->name, *argv);
50 return -1;
51 }
52
53 return 0;
54 }
55
get_genl_kind(const char * str)56 static struct genl_util *get_genl_kind(const char *str)
57 {
58 void *dlh;
59 char buf[256];
60 struct genl_util *f;
61
62 for (f = genl_list; f; f = f->next)
63 if (strcmp(f->name, str) == 0)
64 return f;
65
66 snprintf(buf, sizeof(buf), "%s.so", str);
67 dlh = dlopen(buf, RTLD_LAZY);
68 if (dlh == NULL) {
69 dlh = BODY;
70 if (dlh == NULL) {
71 dlh = BODY = dlopen(NULL, RTLD_LAZY);
72 if (dlh == NULL)
73 goto noexist;
74 }
75 }
76
77 snprintf(buf, sizeof(buf), "%s_genl_util", str);
78
79 f = dlsym(dlh, buf);
80 if (f == NULL)
81 goto noexist;
82 reg:
83 f->next = genl_list;
84 genl_list = f;
85 return f;
86
87 noexist:
88 f = calloc(1, sizeof(*f));
89 if (f) {
90 strncpy(f->name, str, 15);
91 f->parse_genlopt = parse_nofopt;
92 f->print_genlopt = print_nofopt;
93 goto reg;
94 }
95 return f;
96 }
97
98 static void usage(void) __attribute__((noreturn));
99
usage(void)100 static void usage(void)
101 {
102 fprintf(stderr, "Usage: genl [ OPTIONS ] OBJECT | help }\n"
103 "where OBJECT := { ctrl etc }\n"
104 " OPTIONS := { -s[tatistics] | -d[etails] | -r[aw] }\n");
105 exit(-1);
106 }
107
main(int argc,char ** argv)108 int 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-ss%s\n", SNAPSHOT);
122 exit(0);
123 } else if (matches(argv[1], "-help") == 0) {
124 usage();
125 } else {
126 fprintf(stderr, "Option \"%s\" is unknown, try "
127 "\"genl -help\".\n", argv[1]);
128 exit(-1);
129 }
130 argc--; argv++;
131 }
132
133 if (argc > 1) {
134 int ret;
135 struct genl_util *a = NULL;
136 a = get_genl_kind(argv[1]);
137 if (!a) {
138 fprintf(stderr,"bad genl %s\n", argv[1]);
139 exit(-1);
140 }
141
142 ret = a->parse_genlopt(a, argc-1, argv+1);
143 return ret;
144 }
145
146 usage();
147 }
148