tc/tc.c

   1 /*
   2  * tc.c         "tc" 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:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  * Fixes:
  12  *
  13  * Petri Mattila <petri@prihateam.fi> 990308: wrong memset's resulted in faults
  14  */
  15
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <unistd.h>
  19 #include <syslog.h>
  20 #include <fcntl.h>
  21 #include <dlfcn.h>
  22 #include <sys/socket.h>
  23 #include <netinet/in.h>
  24 #include <arpa/inet.h>
  25 #include <string.h>
  26 #include <errno.h>
  27
  28 #include "SNAPSHOT.h"
  29 #include "utils.h"
  30 #include "tc_util.h"
  31 #include "tc_common.h"
  32
  33 int show_stats = 0;
  34 int show_details = 0;
  35 int show_raw = 0;
  36 int resolve_hosts = 0;
  37 int use_iec = 0;
  38 int force = 0;
  39 struct rtnl_handle rth;
  40
  41 static void *BODY;      /* cached handle dlopen(NULL) */
  42 static struct qdisc_util * qdisc_list;
  43 static struct filter_util * filter_list;
  44
  45 static int print_noqopt(struct qdisc_util *qu, FILE *f,
  46                         struct rtattr *opt)
  47 {
  48         if (opt && RTA_PAYLOAD(opt))
  49                 fprintf(f, "[Unknown qdisc, optlen=%u] ",
  50                         (unsigned) RTA_PAYLOAD(opt));
  51         return 0;
  52 }
  53
  54 static int parse_noqopt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  55 {
  56         if (argc) {
  57                 fprintf(stderr, "Unknown qdisc \"%s\", hence option \"%s\" is unparsable\n", qu->id, *argv);
  58                 return -1;
  59         }
  60         return 0;
  61 }
  62
  63 static int print_nofopt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 fhandle)
  64 {
  65         if (opt && RTA_PAYLOAD(opt))
  66                 fprintf(f, "fh %08x [Unknown filter, optlen=%u] ",
  67                         fhandle, (unsigned) RTA_PAYLOAD(opt));
  68         else if (fhandle)
  69                 fprintf(f, "fh %08x ", fhandle);
  70         return 0;
  71 }
  72
  73 static int parse_nofopt(struct filter_util *qu, char *fhandle, int argc, char **argv, struct nlmsghdr *n)
  74 {
  75         __u32 handle;
  76
  77         if (argc) {
  78                 fprintf(stderr, "Unknown filter \"%s\", hence option \"%s\" is unparsable\n", qu->id, *argv);
  79                 return -1;
  80         }
  81         if (fhandle) {
  82                 struct tcmsg *t = NLMSG_DATA(n);
  83                 if (get_u32(&handle, fhandle, 16)) {
  84                         fprintf(stderr, "Unparsable filter ID \"%s\"\n", fhandle);
  85                         return -1;
  86                 }
  87                 t->tcm_handle = handle;
  88         }
  89         return 0;
  90 }
  91
  92 struct qdisc_util *get_qdisc_kind(const char *str)
  93 {
  94         void *dlh;
  95         char buf[256];
  96         struct qdisc_util *q;
  97
  98         for (q = qdisc_list; q; q = q->next)
  99                 if (strcmp(q->id, str) == 0)
 100                         return q;
 101
 102         snprintf(buf, sizeof(buf), "/usr/lib/tc/q_%s.so", str);
 103         dlh = dlopen(buf, RTLD_LAZY);
 104         if (!dlh) {
 105                 /* look in current binary, only open once */
 106                 dlh = BODY;
 107                 if (dlh == NULL) {
 108                         dlh = BODY = dlopen(NULL, RTLD_LAZY);
 109                         if (dlh == NULL)
 110                                 goto noexist;
 111                 }
 112         }
 113
 114         snprintf(buf, sizeof(buf), "%s_qdisc_util", str);
 115         q = dlsym(dlh, buf);
 116         if (q == NULL)
 117                 goto noexist;
 118
 119 reg:
 120         q->next = qdisc_list;
 121         qdisc_list = q;
 122         return q;
 123
 124 noexist:
 125         q = malloc(sizeof(*q));
 126         if (q) {
 127
 128                 memset(q, 0, sizeof(*q));
 129                 q->id = strcpy(malloc(strlen(str)+1), str);
 130                 q->parse_qopt = parse_noqopt;
 131                 q->print_qopt = print_noqopt;
 132                 goto reg;
 133         }
 134         return q;
 135 }
 136
 137
 138 struct filter_util *get_filter_kind(const char *str)
 139 {
 140         void *dlh;
 141         char buf[256];
 142         struct filter_util *q;
 143
 144         for (q = filter_list; q; q = q->next)
 145                 if (strcmp(q->id, str) == 0)
 146                         return q;
 147
 148         snprintf(buf, sizeof(buf), "/usr/lib/tc/f_%s.so", str);
 149         dlh = dlopen(buf, RTLD_LAZY);
 150         if (dlh == NULL) {
 151                 dlh = BODY;
 152                 if (dlh == NULL) {
 153                         dlh = BODY = dlopen(NULL, RTLD_LAZY);
 154                         if (dlh == NULL)
 155                                 goto noexist;
 156                 }
 157         }
 158
 159         snprintf(buf, sizeof(buf), "%s_filter_util", str);
 160         q = dlsym(dlh, buf);
 161         if (q == NULL)
 162                 goto noexist;
 163
 164 reg:
 165         q->next = filter_list;
 166         filter_list = q;
 167         return q;
 168 noexist:
 169         q = malloc(sizeof(*q));
 170         if (q) {
 171                 memset(q, 0, sizeof(*q));
 172                 strncpy(q->id, str, 15);
 173                 q->parse_fopt = parse_nofopt;
 174                 q->print_fopt = print_nofopt;
 175                 goto reg;
 176         }
 177         return q;
 178 }
 179
 180 static void usage(void)
 181 {
 182         fprintf(stderr, "Usage: tc [ OPTIONS ] OBJECT { COMMAND | help }\n"
 183                         "       tc [-force] -batch file\n"
 184                         "where  OBJECT := { qdisc | class | filter | action }\n"
 185                         "       OPTIONS := { -s[tatistics] | -d[etails] | -r[aw] | -b[atch] [file] }\n");
 186 }
 187
 188 static int do_cmd(int argc, char **argv)
 189 {
 190         if (matches(*argv, "qdisc") == 0)
 191                 return do_qdisc(argc-1, argv+1);
 192
 193         if (matches(*argv, "class") == 0)
 194                 return do_class(argc-1, argv+1);
 195
 196         if (matches(*argv, "filter") == 0)
 197                 return do_filter(argc-1, argv+1);
 198
 199         if (matches(*argv, "actions") == 0)
 200                 return do_action(argc-1, argv+1);
 201
 202         if (matches(*argv, "help") == 0) {
 203                 usage();
 204                 return 0;
 205         }
 206
 207         fprintf(stderr, "Object \"%s\" is unknown, try \"tc help\".\n",
 208                 *argv);
 209         return -1;
 210 }
 211
 212 static int batch(const char *name)
 213 {
 214         char *line = NULL;
 215         size_t len = 0;
 216         int ret = 0;
 217
 218         if (name && strcmp(name, "-") != 0) {
 219                 if (freopen(name, "r", stdin) == NULL) {
 220                         fprintf(stderr, "Cannot open file \"%s\" for reading: %s=n",
 221                                 name, strerror(errno));
 222                         return -1;
 223                 }
 224         }
 225
 226         tc_core_init();
 227
 228         if (rtnl_open(&rth, 0) < 0) {
 229                 fprintf(stderr, "Cannot open rtnetlink\n");
 230                 return -1;
 231         }
 232
 233         cmdlineno = 0;
 234         while (getcmdline(&line, &len, stdin) != -1) {
 235                 char *largv[100];
 236                 int largc;
 237
 238                 largc = makeargs(line, largv, 100);
 239                 if (largc == 0)
 240                         continue;       /* blank line */
 241
 242                 if (do_cmd(largc, largv)) {
 243                         fprintf(stderr, "Command failed %s:%d\n", name, cmdlineno);
 244                         ret = 1;
 245                         if (!force)
 246                                 break;
 247                 }
 248         }
 249
 250         rtnl_close(&rth);
 251         return ret;
 252 }
 253
 254
 255 int main(int argc, char **argv)
 256 {
 257         int ret;
 258         int do_batching = 0;
 259         char *batchfile = NULL;
 260
 261         while (argc > 1) {
 262                 if (argv[1][0] != '-')
 263                         break;
 264                 if (matches(argv[1], "-stats") == 0 ||
 265                          matches(argv[1], "-statistics") == 0) {
 266                         ++show_stats;
 267                 } else if (matches(argv[1], "-details") == 0) {
 268                         ++show_details;
 269                 } else if (matches(argv[1], "-raw") == 0) {
 270                         ++show_raw;
 271                 } else if (matches(argv[1], "-Version") == 0) {
 272                         printf("tc utility, iproute2-ss%s\n", SNAPSHOT);
 273                         return 0;
 274                 } else if (matches(argv[1], "-iec") == 0) {
 275                         ++use_iec;
 276                 } else if (matches(argv[1], "-help") == 0) {
 277                         usage();
 278                         return 0;
 279                 } else if (matches(argv[1], "-force") == 0) {
 280                         ++force;
 281                 } else  if (matches(argv[1], "-batch") == 0) {
 282                         do_batching = 1;
 283                         if (argc > 2)
 284                                 batchfile = argv[2];
 285                         argc--; argv++;
 286                 } else {
 287                         fprintf(stderr, "Option \"%s\" is unknown, try \"tc -help\".\n", argv[1]);
 288                         return -1;
 289                 }
 290                 argc--; argv++;
 291         }
 292
 293         if (do_batching)
 294                 return batch(batchfile);
 295
 296         if (argc <= 1) {
 297                 usage();
 298                 return 0;
 299         }
 300
 301         tc_core_init();
 302         if (rtnl_open(&rth, 0) < 0) {
 303                 fprintf(stderr, "Cannot open rtnetlink\n");
 304                 exit(1);
 305         }
 306
 307         ret = do_cmd(argc-1, argv+1);
 308         rtnl_close(&rth);
 309
 310         return ret;
 311 }