LXR iproute2/genl/genl.c

   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 <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> /* until we put our own header */
  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