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