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, "%s Version %s\n", name, LNSTAT_VERSION);
  59         fprintf(stderr, "Copyright (C) 2004 by Harald Welte <laforge@gnumonks.org>\n");
  60         fprintf(stderr, "This program is free software licensed under GNU GPLv2\nwith ABSOLUTELY NO WARRANTY.\n\n");
  61         fprintf(stderr, "Parameters:\n");
  62         fprintf(stderr, "\t-V --version\t\tPrint Version of Program\n");
  63         fprintf(stderr, "\t-c --count <count>\t"
  64                         "Print <count> number of intervals\n");
  65         fprintf(stderr, "\t-d --dump\t\t"
  66                         "Dump list of available files/keys\n");
  67         fprintf(stderr, "\t-j --json\t\t"
  68                         "Display in JSON format\n");
  69         fprintf(stderr, "\t-f --file <file>\tStatistics file to use\n");
  70         fprintf(stderr, "\t-h --help\t\tThis help message\n");
  71         fprintf(stderr, "\t-i --interval <intv>\t"
  72                         "Set interval to 'intv' seconds\n");
  73         fprintf(stderr, "\t-k --keys k,k,k,...\tDisplay only keys specified\n");
  74         fprintf(stderr, "\t-s --subject [0-2]\tControl header printing:\n");
  75         fprintf(stderr, "\t\t\t\t0 = never\n");
  76         fprintf(stderr, "\t\t\t\t1 = once\n");
  77         fprintf(stderr, "\t\t\t\t2 = every 20 lines (default))\n");
  78         fprintf(stderr, "\t-w --width n,n,n,...\tWidth for each field\n");
  79         fprintf(stderr, "\n");
  80
  81         exit(exit_code);
  82 }
  83
  84 struct field_param {
  85         const char *name;
  86         struct lnstat_field *lf;
  87         struct {
  88                 unsigned int width;
  89         } print;
  90 };
  91
  92 struct field_params {
  93         unsigned int num;
  94         struct field_param params[MAX_FIELDS];
  95 };
  96
  97 static void print_line(FILE *of, const struct lnstat_file *lnstat_files,
  98                        const struct field_params *fp)
  99 {
 100         int i;
 101
 102         for (i = 0; i < fp->num; i++) {
 103                 const struct lnstat_field *lf = fp->params[i].lf;
 104
 105                 fprintf(of, "%*lu|", fp->params[i].print.width, lf->result);
 106         }
 107         fputc('\n', of);
 108 }
 109
 110 static void print_json(FILE *of, const struct lnstat_file *lnstat_files,
 111                        const struct field_params *fp)
 112 {
 113         json_writer_t *jw = jsonw_new(of);
 114         int i;
 115
 116         jsonw_start_object(jw);
 117         for (i = 0; i < fp->num; i++) {
 118                 const struct lnstat_field *lf = fp->params[i].lf;
 119
 120                 jsonw_uint_field(jw, lf->name, lf->result);
 121         }
 122         jsonw_end_object(jw);
 123         jsonw_destroy(&jw);
 124 }
 125
 126 /* find lnstat_field according to user specification */
 127 static int map_field_params(struct lnstat_file *lnstat_files,
 128                             struct field_params *fps, int interval)
 129 {
 130         int i, j = 0;
 131         struct lnstat_file *lf;
 132
 133         /* no field specification on commandline, need to build default */
 134         if (!fps->num) {
 135                 for (lf = lnstat_files; lf; lf = lf->next) {
 136                         for (i = 0; i < lf->num_fields; i++) {
 137                                 fps->params[j].lf = &lf->fields[i];
 138                                 fps->params[j].lf->file->interval.tv_sec =
 139                                                                 interval;
 140                                 if (!fps->params[j].print.width)
 141                                         fps->params[j].print.width =
 142                                                         FIELD_WIDTH_DEFAULT;
 143
 144                                 if (++j >= MAX_FIELDS - 1) {
 145                                         fprintf(stderr,
 146                                                 "WARN: MAX_FIELDS (%d) reached, truncating number of keys\n",
 147                                                 MAX_FIELDS);
 148                                         goto full;
 149                                 }
 150                         }
 151                 }
 152 full:
 153                 fps->num = j;
 154                 return 1;
 155         }
 156
 157         for (i = 0; i < fps->num; i++) {
 158                 fps->params[i].lf = lnstat_find_field(lnstat_files,
 159                                                       fps->params[i].name);
 160                 if (!fps->params[i].lf) {
 161                         fprintf(stderr, "Field `%s' unknown\n",
 162                                 fps->params[i].name);
 163                         return 0;
 164                 }
 165                 fps->params[i].lf->file->interval.tv_sec = interval;
 166                 if (!fps->params[i].print.width)
 167                         fps->params[i].print.width = FIELD_WIDTH_DEFAULT;
 168         }
 169         return 1;
 170 }
 171
 172 struct table_hdr {
 173         int num_lines;
 174         char *hdr[HDR_LINES];
 175 };
 176
 177 static struct table_hdr *build_hdr_string(struct lnstat_file *lnstat_files,
 178                                           struct field_params *fps,
 179                                           int linewidth)
 180 {
 181         int h, i;
 182         static struct table_hdr th;
 183         int ofs = 0;
 184
 185         for (i = 0; i < HDR_LINES; i++)
 186                 th.hdr[i] = calloc(1, HDR_LINE_LENGTH);
 187
 188         for (i = 0; i < fps->num; i++) {
 189                 char *cname, *fname = fps->params[i].lf->name;
 190                 unsigned int width = fps->params[i].print.width;
 191
 192                 snprintf(th.hdr[0]+ofs, width+2, "%*.*s|", width, width,
 193                          fps->params[i].lf->file->basename);
 194
 195                 cname = fname;
 196                 for (h = 1; h < HDR_LINES; h++) {
 197                         if (cname - fname >= strlen(fname))
 198                                 snprintf(th.hdr[h]+ofs, width+2,
 199                                          "%*.*s|", width, width, "");
 200                         else {
 201                                 th.num_lines = h+1;
 202                                 snprintf(th.hdr[h]+ofs, width+2,
 203                                          "%*.*s|", width, width, cname);
 204                         }
 205                         cname += width;
 206                 }
 207                 ofs += width+1;
 208         }
 209         /* fill in spaces */
 210         for (h = 1; h <= th.num_lines; h++) {
 211                 for (i = 0; i < ofs; i++) {
 212                         if (th.hdr[h][i] == '\0')
 213                                 th.hdr[h][i] = ' ';
 214                 }
 215         }
 216
 217         return &th;
 218 }
 219
 220 static int print_hdr(FILE *of, struct table_hdr *th)
 221 {
 222         int i;
 223
 224         for (i = 0; i < th->num_lines; i++) {
 225                 fputs(th->hdr[i], of);
 226                 fputc('\n', of);
 227         }
 228         return 0;
 229 }
 230
 231
 232 int main(int argc, char **argv)
 233 {
 234         struct lnstat_file *lnstat_files;
 235         const char *basename;
 236         int i, c;
 237         int interval = DEFAULT_INTERVAL;
 238         int hdr = 2;
 239         enum {
 240                 MODE_DUMP,
 241                 MODE_JSON,
 242                 MODE_NORMAL,
 243         } mode = MODE_NORMAL;
 244         unsigned long count = 0;
 245         struct table_hdr *header;
 246         static struct field_params fp;
 247         int num_req_files = 0;
 248         char *req_files[LNSTAT_MAX_FILES];
 249
 250         /* backwards compatibility mode for old tools */
 251         basename = strrchr(argv[0], '/');
 252         if (basename)
 253                 basename += 1;    /* name after slash */
 254         else
 255                 basename = argv[0]; /* no slash */
 256
 257         if (!strcmp(basename, "rtstat")) {
 258                 /* rtstat compatibility mode */
 259                 req_files[0] = "rt_cache";
 260                 num_req_files = 1;
 261         } else if (!strcmp(basename, "ctstat")) {
 262                 /* ctstat compatibility mode */
 263                 req_files[0] = "ip_conntrack";
 264                 num_req_files = 1;
 265         }
 266
 267         while ((c = getopt_long(argc, argv, "Vc:djpf:h?i:k:s:w:",
 268                                 opts, NULL)) != -1) {
 269                 int len = 0;
 270                 char *tmp, *tok;
 271
 272                 switch (c) {
 273                 case 'c':
 274                         count = strtoul(optarg, NULL, 0);
 275                         break;
 276                 case 'd':
 277                         mode = MODE_DUMP;
 278                         break;
 279                 case 'j':
 280                         mode = MODE_JSON;
 281                         break;
 282                 case 'f':
 283                         req_files[num_req_files++] = strdup(optarg);
 284                         break;
 285                 case '?':
 286                 case 'h':
 287                         usage(argv[0], 0);
 288                         break;
 289                 case 'i':
 290                         sscanf(optarg, "%u", &interval);
 291                         break;
 292                 case 'k':
 293                         tmp = strdup(optarg);
 294                         if (!tmp)
 295                                 break;
 296                         for (tok = strtok(tmp, ",");
 297                              tok;
 298                              tok = strtok(NULL, ",")) {
 299                                 if (fp.num >= MAX_FIELDS) {
 300                                         fprintf(stderr,
 301                                                 "WARN: too many keys requested: (%d max)\n",
 302                                                 MAX_FIELDS);
 303                                         break;
 304                                 }
 305                                 fp.params[fp.num++].name = tok;
 306                         }
 307                         break;
 308                 case 's':
 309                         sscanf(optarg, "%u", &hdr);
 310                         break;
 311                 case 'w':
 312                         tmp = strdup(optarg);
 313                         if (!tmp)
 314                                 break;
 315                         i = 0;
 316                         for (tok = strtok(tmp, ",");
 317                              tok;
 318                              tok = strtok(NULL, ",")) {
 319                                 len  = strtoul(tok, NULL, 0);
 320                                 if (len > FIELD_WIDTH_MAX)
 321                                         len = FIELD_WIDTH_MAX;
 322                                 fp.params[i].print.width = len;
 323                                 i++;
 324                         }
 325                         if (i == 1) {
 326                                 for (i = 0; i < MAX_FIELDS; i++)
 327                                         fp.params[i].print.width = len;
 328                         }
 329                         break;
 330                 default:
 331                         usage(argv[0], 1);
 332                         break;
 333                 }
 334         }
 335
 336         lnstat_files = lnstat_scan_dir(PROC_NET_STAT, num_req_files,
 337                                        (const char **) req_files);
 338
 339         switch (mode) {
 340         case MODE_DUMP:
 341                 lnstat_dump(stdout, lnstat_files);
 342                 break;
 343
 344         case MODE_NORMAL:
 345         case MODE_JSON:
 346                 if (!map_field_params(lnstat_files, &fp, interval))
 347                         exit(1);
 348
 349                 header = build_hdr_string(lnstat_files, &fp, 80);
 350                 if (!header)
 351                         exit(1);
 352
 353                 if (interval < 1)
 354                         interval = 1;
 355
 356                 for (i = 0; i < count || !count; i++) {
 357                         lnstat_update(lnstat_files);
 358                         if (mode == MODE_JSON)
 359                                 print_json(stdout, lnstat_files, &fp);
 360                         else {
 361                                 if  ((hdr > 1 && !(i % 20)) ||
 362                                      (hdr == 1 && i == 0))
 363                                         print_hdr(stdout, header);
 364                                 print_line(stdout, lnstat_files, &fp);
 365                         }
 366                         fflush(stdout);
 367                         if (i < count - 1 || !count)
 368                                 sleep(interval);
 369                 }
 370                 break;
 371         }
 372
 373         return 1;
 374 }