misc/lnstat.c

   1 /* lnstat - Unified linux network statistics
   2  *
   3  * Copyright (C) 2004 by Harald Welte <laforge@gnumonks.org>
   4  *
   5  * Development of this code was funded by Astaro AG, http://www.astaro.com/
   6  *
   7  * Based on original concept and ideas from predecessor rtstat.c:
   8  *
   9  * Copyright 2001 by Robert Olsson <robert.olsson@its.uu.se>
  10  *                                 Uppsala University, Sweden
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  */
  18
  19 /* Maximum number of fields that can be displayed */
  20 #define MAX_FIELDS              128
  21
  22 /* Maximum number of header lines */
  23 #define HDR_LINES               10
  24
  25 /* default field width if none specified */
  26 #define FIELD_WIDTH_DEFAULT     8
  27 #define FIELD_WIDTH_MAX         20
  28
  29 #define DEFAULT_INTERVAL        2
  30
  31 #define HDR_LINE_LENGTH         (MAX_FIELDS*FIELD_WIDTH_MAX)
  32
  33 #include <unistd.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <getopt.h>
  38
  39 #include <json_writer.h>
  40 #include "lnstat.h"
  41 #include "version.h"
  42
  43 static struct option opts[] = {
  44         { "version", 0, NULL, 'V' },
  45         { "count", 1, NULL, 'c' },
  46         { "dump", 0, NULL, 'd' },
  47         { "json", 0, NULL, 'j' },
  48         { "file", 1, NULL, 'f' },
  49         { "help", 0, NULL, 'h' },
  50         { "interval", 1, NULL, 'i' },
  51         { "keys", 1, NULL, 'k' },
  52         { "subject", 1, NULL, 's' },
  53         { "width", 1, NULL, 'w' },
  54         { "oneline", 0, NULL, 0 },
  55 };
  56
  57 static int usage(char *name, int exit_code)
  58 {
  59         fprintf(stderr,
  60                 "%s Version %s\n"
  61                 "Copyright (C) 2004 by Harald Welte <laforge@gnumonks.org>\n"
  62                 "This program is free software licensed under GNU GPLv2\nwith ABSOLUTELY NO WARRANTY.\n"
  63                 "\n"
  64                 "Parameters:\n"
  65                 "       -V --version            Print Version of Program\n"
  66                 "       -c --count <count>      "
  67                 "Print <count> number of intervals\n"
  68                 "       -d --dump               "
  69                 "Dump list of available files/keys\n"
  70                 "       -j --json               "
  71                 "Display in JSON format\n"
  72                 "       -f --file <file>        Statistics file to use\n"
  73                 "       -h --help               This help message\n"
  74                 "       -i --interval <intv>    "
  75                 "Set interval to 'intv' seconds\n"
  76                 "       -k --keys k,k,k,...     Display only keys specified\n"
  77                 "       -s --subject [0-2]      Control header printing:\n"
  78                 "                               0 = never\n"
  79                 "                               1 = once\n"
  80                 "                               2 = every 20 lines (default))\n"
  81                 "       -w --width n,n,n,...    Width for each field\n"
  82                 "\n",
  83                 name, version);
  84
  85         exit(exit_code);
  86 }
  87
  88 struct field_param {
  89         const char *name;
  90         struct lnstat_field *lf;
  91         struct {
  92                 unsigned int width;
  93         } print;
  94 };
  95
  96 struct field_params {
  97         unsigned int num;
  98         struct field_param params[MAX_FIELDS];
  99 };
 100
 101 static void print_line(FILE *of, const struct lnstat_file *lnstat_files,
 102                        const struct field_params *fp)
 103 {
 104         int i;
 105
 106         for (i = 0; i < fp->num; i++) {
 107                 const struct lnstat_field *lf = fp->params[i].lf;
 108
 109                 fprintf(of, "%*lu|", fp->params[i].print.width, lf->result);
 110         }
 111         fputc('\n', of);
 112 }
 113
 114 static void print_json(FILE *of, const struct lnstat_file *lnstat_files,
 115                        const struct field_params *fp)
 116 {
 117         json_writer_t *jw = jsonw_new(of);
 118         int i;
 119
 120         jsonw_start_object(jw);
 121         for (i = 0; i < fp->num; i++) {
 122                 const struct lnstat_field *lf = fp->params[i].lf;
 123
 124                 jsonw_uint_field(jw, lf->name, lf->result);
 125         }
 126         jsonw_end_object(jw);
 127         jsonw_destroy(&jw);
 128 }
 129
 130 /* find lnstat_field according to user specification */
 131 static int map_field_params(struct lnstat_file *lnstat_files,
 132                             struct field_params *fps, int interval)
 133 {
 134         int i, j = 0;
 135         struct lnstat_file *lf;
 136
 137         /* no field specification on commandline, need to build default */
 138         if (!fps->num) {
 139                 for (lf = lnstat_files; lf; lf = lf->next) {
 140                         for (i = 0; i < lf->num_fields; i++) {
 141                                 fps->params[j].lf = &lf->fields[i];
 142                                 fps->params[j].lf->file->interval.tv_sec =
 143                                                                 interval;
 144                                 if (!fps->params[j].print.width)
 145                                         fps->params[j].print.width =
 146                                                         FIELD_WIDTH_DEFAULT;
 147
 148                                 if (++j >= MAX_FIELDS - 1) {
 149                                         fprintf(stderr,
 150                                                 "WARN: MAX_FIELDS (%d) reached, truncating number of keys\n",
 151                                                 MAX_FIELDS);
 152                                         goto full;
 153                                 }
 154                         }
 155                 }
 156 full:
 157                 fps->num = j;
 158                 return 1;
 159         }
 160
 161         for (i = 0; i < fps->num; i++) {
 162                 fps->params[i].lf = lnstat_find_field(lnstat_files,
 163                                                       fps->params[i].name);
 164                 if (!fps->params[i].lf) {
 165                         fprintf(stderr, "Field `%s' unknown\n",
 166                                 fps->params[i].name);
 167                         return 0;
 168                 }
 169                 fps->params[i].lf->file->interval.tv_sec = interval;
 170                 if (!fps->params[i].print.width)
 171                         fps->params[i].print.width = FIELD_WIDTH_DEFAULT;
 172         }
 173         return 1;
 174 }
 175
 176 struct table_hdr {
 177         int num_lines;
 178         char *hdr[HDR_LINES];
 179 };
 180
 181 static struct table_hdr *build_hdr_string(struct lnstat_file *lnstat_files,
 182                                           struct field_params *fps,
 183                                           int linewidth)
 184 {
 185         int h, i;
 186         static struct table_hdr th;
 187         int ofs = 0;
 188
 189         for (i = 0; i < HDR_LINES; i++)
 190                 th.hdr[i] = calloc(1, HDR_LINE_LENGTH);
 191
 192         for (i = 0; i < fps->num; i++) {
 193                 char *cname, *fname = fps->params[i].lf->name;
 194                 unsigned int width = fps->params[i].print.width;
 195
 196                 snprintf(th.hdr[0]+ofs, width+2, "%*.*s|", width, width,
 197                          fps->params[i].lf->file->basename);
 198
 199                 cname = fname;
 200                 for (h = 1; h < HDR_LINES; h++) {
 201                         if (cname - fname >= strlen(fname))
 202                                 snprintf(th.hdr[h]+ofs, width+2,
 203                                          "%*.*s|", width, width, "");
 204                         else {
 205                                 th.num_lines = h+1;
 206                                 snprintf(th.hdr[h]+ofs, width+2,
 207                                          "%*.*s|", width, width, cname);
 208                         }
 209                         cname += width;
 210                 }
 211                 ofs += width+1;
 212         }
 213         /* fill in spaces */
 214         for (h = 1; h <= th.num_lines; h++) {
 215                 for (i = 0; i < ofs; i++) {
 216                         if (th.hdr[h][i] == '\0')
 217                                 th.hdr[h][i] = ' ';
 218                 }
 219         }
 220
 221         return &th;
 222 }
 223
 224 static int print_hdr(FILE *of, struct table_hdr *th)
 225 {
 226         int i;
 227
 228         for (i = 0; i < th->num_lines; i++) {
 229                 fputs(th->hdr[i], of);
 230                 fputc('\n', of);
 231         }
 232         return 0;
 233 }
 234
 235
 236 int main(int argc, char **argv)
 237 {
 238         struct lnstat_file *lnstat_files;
 239         const char *basename;
 240         int i, c;
 241         int interval = DEFAULT_INTERVAL;
 242         int hdr = 2;
 243         enum {
 244                 MODE_DUMP,
 245                 MODE_JSON,
 246                 MODE_NORMAL,
 247         } mode = MODE_NORMAL;
 248         unsigned long count = 0;
 249         struct table_hdr *header;
 250         static struct field_params fp;
 251         int num_req_files = 0;
 252         char *req_files[LNSTAT_MAX_FILES];
 253
 254         /* backwards compatibility mode for old tools */
 255         basename = strrchr(argv[0], '/');
 256         if (basename)
 257                 basename += 1;    /* name after slash */
 258         else
 259                 basename = argv[0]; /* no slash */
 260
 261         if (!strcmp(basename, "rtstat")) {
 262                 /* rtstat compatibility mode */
 263                 req_files[0] = "rt_cache";
 264                 num_req_files = 1;
 265         } else if (!strcmp(basename, "ctstat")) {
 266                 /* ctstat compatibility mode */
 267                 req_files[0] = "ip_conntrack";
 268                 num_req_files = 1;
 269         }
 270
 271         while ((c = getopt_long(argc, argv, "Vc:djpf:h?i:k:s:w:",
 272                                 opts, NULL)) != -1) {
 273                 int len = 0;
 274                 char *tmp, *tok;
 275
 276                 switch (c) {
 277                 case 'c':
 278                         count = strtoul(optarg, NULL, 0);
 279                         break;
 280                 case 'd':
 281                         mode = MODE_DUMP;
 282                         break;
 283                 case 'j':
 284                         mode = MODE_JSON;
 285                         break;
 286                 case 'f':
 287                         req_files[num_req_files++] = strdup(optarg);
 288                         break;
 289                 case '?':
 290                 case 'h':
 291                         usage(argv[0], 0);
 292                         break;
 293                 case 'i':
 294                         sscanf(optarg, "%u", &interval);
 295                         break;
 296                 case 'k':
 297                         tmp = strdup(optarg);
 298                         if (!tmp)
 299                                 break;
 300                         for (tok = strtok(tmp, ",");
 301                              tok;
 302                              tok = strtok(NULL, ",")) {
 303                                 if (fp.num >= MAX_FIELDS) {
 304                                         fprintf(stderr,
 305                                                 "WARN: too many keys requested: (%d max)\n",
 306                                                 MAX_FIELDS);
 307                                         break;
 308                                 }
 309                                 fp.params[fp.num++].name = tok;
 310                         }
 311                         break;
 312                 case 's':
 313                         sscanf(optarg, "%u", &hdr);
 314                         break;
 315                 case 'w':
 316                         tmp = strdup(optarg);
 317                         if (!tmp)
 318                                 break;
 319                         i = 0;
 320                         for (tok = strtok(tmp, ",");
 321                              tok;
 322                              tok = strtok(NULL, ",")) {
 323                                 len  = strtoul(tok, NULL, 0);
 324                                 if (len > FIELD_WIDTH_MAX)
 325                                         len = FIELD_WIDTH_MAX;
 326                                 fp.params[i].print.width = len;
 327                                 i++;
 328                         }
 329                         if (i == 1) {
 330                                 for (i = 0; i < MAX_FIELDS; i++)
 331                                         fp.params[i].print.width = len;
 332                         }
 333                         break;
 334                 default:
 335                         usage(argv[0], 1);
 336                         break;
 337                 }
 338         }
 339
 340         lnstat_files = lnstat_scan_dir(PROC_NET_STAT, num_req_files,
 341                                        (const char **) req_files);
 342
 343         switch (mode) {
 344         case MODE_DUMP:
 345                 lnstat_dump(stdout, lnstat_files);
 346                 break;
 347
 348         case MODE_NORMAL:
 349         case MODE_JSON:
 350                 if (!map_field_params(lnstat_files, &fp, interval))
 351                         exit(1);
 352
 353                 header = build_hdr_string(lnstat_files, &fp, 80);
 354                 if (!header)
 355                         exit(1);
 356
 357                 if (interval < 1)
 358                         interval = 1;
 359
 360                 for (i = 0; i < count || !count; i++) {
 361                         lnstat_update(lnstat_files);
 362                         if (mode == MODE_JSON)
 363                                 print_json(stdout, lnstat_files, &fp);
 364                         else {
 365                                 if  ((hdr > 1 && !(i % 20)) ||
 366                                      (hdr == 1 && i == 0))
 367                                         print_hdr(stdout, header);
 368                                 print_line(stdout, lnstat_files, &fp);
 369                         }
 370                         fflush(stdout);
 371                         if (i < count - 1 || !count)
 372                                 sleep(interval);
 373                 }
 374                 break;
 375         }
 376
 377         return 1;
 378 }