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 show_pretty = 0;
  37 int show_graph = 0;
  38
  39 int batch_mode = 0;
  40 int resolve_hosts = 0;
  41 int use_iec = 0;
  42 int force = 0;
  43 struct rtnl_handle rth;
  44
  45 static void *BODY = NULL;       /* cached handle dlopen(NULL) */
  46 static struct qdisc_util * qdisc_list;
  47 static struct filter_util * filter_list;
  48
  49 static int print_noqopt(struct qdisc_util *qu, FILE *f,
  50                         struct rtattr *opt)
  51 {
  52         if (opt && RTA_PAYLOAD(opt))
  53                 fprintf(f, "[Unknown qdisc, optlen=%u] ",
  54                         (unsigned) RTA_PAYLOAD(opt));
  55         return 0;
  56 }
  57
  58 static int parse_noqopt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  59 {
  60         if (argc) {
  61                 fprintf(stderr, "Unknown qdisc \"%s\", hence option \"%s\" is unparsable\n", qu->id, *argv);
  62                 return -1;
  63         }
  64         return 0;
  65 }
  66
  67 static int print_nofopt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 fhandle)
  68 {
  69         if (opt && RTA_PAYLOAD(opt))
  70                 fprintf(f, "fh %08x [Unknown filter, optlen=%u] ",
  71                         fhandle, (unsigned) RTA_PAYLOAD(opt));
  72         else if (fhandle)
  73                 fprintf(f, "fh %08x ", fhandle);
  74         return 0;
  75 }
  76
  77 static int parse_nofopt(struct filter_util *qu, char *fhandle, int argc, char **argv, struct nlmsghdr *n)
  78 {
  79         __u32 handle;
  80
  81         if (argc) {
  82                 fprintf(stderr, "Unknown filter \"%s\", hence option \"%s\" is unparsable\n", qu->id, *argv);
  83                 return -1;
  84         }
  85         if (fhandle) {
  86                 struct tcmsg *t = NLMSG_DATA(n);
  87                 if (get_u32(&handle, fhandle, 16)) {
  88                         fprintf(stderr, "Unparsable filter ID \"%s\"\n", fhandle);
  89                         return -1;
  90                 }
  91                 t->tcm_handle = handle;
  92         }
  93         return 0;
  94 }
  95
  96 struct qdisc_util *get_qdisc_kind(const char *str)
  97 {
  98         void *dlh;
  99         char buf[256];
 100         struct qdisc_util *q;
 101
 102         for (q = qdisc_list; q; q = q->next)
 103                 if (strcmp(q->id, str) == 0)
 104                         return q;
 105
 106         snprintf(buf, sizeof(buf), "%s/q_%s.so", get_tc_lib(), str);
 107         dlh = dlopen(buf, RTLD_LAZY);
 108         if (!dlh) {
 109                 /* look in current binary, only open once */
 110                 dlh = BODY;
 111                 if (dlh == NULL) {
 112                         dlh = BODY = dlopen(NULL, RTLD_LAZY);
 113                         if (dlh == NULL)
 114                                 goto noexist;
 115                 }
 116         }
 117
 118         snprintf(buf, sizeof(buf), "%s_qdisc_util", str);
 119         q = dlsym(dlh, buf);
 120         if (q == NULL)
 121                 goto noexist;
 122
 123 reg:
 124         q->next = qdisc_list;
 125         qdisc_list = q;
 126         return q;
 127
 128 noexist:
 129         q = malloc(sizeof(*q));
 130         if (q) {
 131
 132                 memset(q, 0, sizeof(*q));
 133                 q->id = strcpy(malloc(strlen(str)+1), str);
 134                 q->parse_qopt = parse_noqopt;
 135                 q->print_qopt = print_noqopt;
 136                 goto reg;
 137         }
 138         return q;
 139 }
 140
 141
 142 struct filter_util *get_filter_kind(const char *str)
 143 {
 144         void *dlh;
 145         char buf[256];
 146         struct filter_util *q;
 147
 148         for (q = filter_list; q; q = q->next)
 149                 if (strcmp(q->id, str) == 0)
 150                         return q;
 151
 152         snprintf(buf, sizeof(buf), "%s/f_%s.so", get_tc_lib(), str);
 153         dlh = dlopen(buf, RTLD_LAZY);
 154         if (dlh == NULL) {
 155                 dlh = BODY;
 156                 if (dlh == NULL) {
 157                         dlh = BODY = dlopen(NULL, RTLD_LAZY);
 158                         if (dlh == NULL)
 159                                 goto noexist;
 160                 }
 161         }
 162
 163         snprintf(buf, sizeof(buf), "%s_filter_util", str);
 164         q = dlsym(dlh, buf);
 165         if (q == NULL)
 166                 goto noexist;
 167
 168 reg:
 169         q->next = filter_list;
 170         filter_list = q;
 171         return q;
 172 noexist:
 173         q = malloc(sizeof(*q));
 174         if (q) {
 175                 memset(q, 0, sizeof(*q));
 176                 strncpy(q->id, str, 15);
 177                 q->parse_fopt = parse_nofopt;
 178                 q->print_fopt = print_nofopt;
 179                 goto reg;
 180         }
 181         return q;
 182 }
 183
 184 static void usage(void)
 185 {
 186         fprintf(stderr, "Usage: tc [ OPTIONS ] OBJECT { COMMAND | help }\n"
 187                         "       tc [-force] -batch filename\n"
 188                         "where  OBJECT := { qdisc | class | filter | action | monitor }\n"
 189                         "       OPTIONS := { -s[tatistics] | -d[etails] | -r[aw] | -p[retty] | -b[atch] [filename] }\n");
 190 }
 191
 192 static int do_cmd(int argc, char **argv)
 193 {
 194         if (matches(*argv, "qdisc") == 0)
 195                 return do_qdisc(argc-1, argv+1);
 196
 197         if (matches(*argv, "class") == 0)
 198                 return do_class(argc-1, argv+1);
 199
 200         if (matches(*argv, "filter") == 0)
 201                 return do_filter(argc-1, argv+1);
 202
 203         if (matches(*argv, "actions") == 0)
 204                 return do_action(argc-1, argv+1);
 205
 206         if (matches(*argv, "monitor") == 0)
 207                 return do_tcmonitor(argc-1, argv+1);
 208
 209         if (matches(*argv, "help") == 0) {
 210                 usage();
 211                 return 0;
 212         }
 213
 214         fprintf(stderr, "Object \"%s\" is unknown, try \"tc help\".\n",
 215                 *argv);
 216         return -1;
 217 }
 218
 219 static int batch(const char *name)
 220 {
 221         char *line = NULL;
 222         size_t len = 0;
 223         int ret = 0;
 224
 225         batch_mode = 1;
 226         if (name && strcmp(name, "-") != 0) {
 227                 if (freopen(name, "r", stdin) == NULL) {
 228                         fprintf(stderr, "Cannot open file \"%s\" for reading: %s\n",
 229                                 name, strerror(errno));
 230                         return -1;
 231                 }
 232         }
 233
 234         tc_core_init();
 235
 236         if (rtnl_open(&rth, 0) < 0) {
 237                 fprintf(stderr, "Cannot open rtnetlink\n");
 238                 return -1;
 239         }
 240
 241         cmdlineno = 0;
 242         while (getcmdline(&line, &len, stdin) != -1) {
 243                 char *largv[100];
 244                 int largc;
 245
 246                 largc = makeargs(line, largv, 100);
 247                 if (largc == 0)
 248                         continue;       /* blank line */
 249
 250                 if (do_cmd(largc, largv)) {
 251                         fprintf(stderr, "Command failed %s:%d\n", name, cmdlineno);
 252                         ret = 1;
 253                         if (!force)
 254                                 break;
 255                 }
 256         }
 257         if (line)
 258                 free(line);
 259
 260         rtnl_close(&rth);
 261         return ret;
 262 }
 263
 264
 265 int main(int argc, char **argv)
 266 {
 267         int ret;
 268         char *batch_file = NULL;
 269
 270         while (argc > 1) {
 271                 if (argv[1][0] != '-')
 272                         break;
 273                 if (matches(argv[1], "-stats") == 0 ||
 274                          matches(argv[1], "-statistics") == 0) {
 275                         ++show_stats;
 276                 } else if (matches(argv[1], "-details") == 0) {
 277                         ++show_details;
 278                 } else if (matches(argv[1], "-raw") == 0) {
 279                         ++show_raw;
 280                 } else if (matches(argv[1], "-pretty") == 0) {
 281                         ++show_pretty;
 282                 } else if (matches(argv[1], "-graph") == 0) {
 283                         show_graph = 1;
 284                 } else if (matches(argv[1], "-Version") == 0) {
 285                         printf("tc utility, iproute2-ss%s\n", SNAPSHOT);
 286                         return 0;
 287                 } else if (matches(argv[1], "-iec") == 0) {
 288                         ++use_iec;
 289                 } else if (matches(argv[1], "-help") == 0) {
 290                         usage();
 291                         return 0;
 292                 } else if (matches(argv[1], "-force") == 0) {
 293                         ++force;
 294                 } else  if (matches(argv[1], "-batch") == 0) {
 295                         argc--; argv++;
 296                         if (argc <= 1)
 297                                 usage();
 298                         batch_file = argv[1];
 299                 } else {
 300                         fprintf(stderr, "Option \"%s\" is unknown, try \"tc -help\".\n", argv[1]);
 301                         return -1;
 302                 }
 303                 argc--; argv++;
 304         }
 305
 306         if (batch_file)
 307                 return batch(batch_file);
 308
 309         if (argc <= 1) {
 310                 usage();
 311                 return 0;
 312         }
 313
 314         tc_core_init();
 315         if (rtnl_open(&rth, 0) < 0) {
 316                 fprintf(stderr, "Cannot open rtnetlink\n");
 317                 exit(1);
 318         }
 319
 320         ret = do_cmd(argc-1, argv+1);
 321         rtnl_close(&rth);
 322
 323         return ret;
 324 }