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 "
  60                         "<laforge@gnumonks.org>\n");
  61         fprintf(stderr, "This program is free software licensed under GNU GPLv2"
  62                         "\nwith ABSOLUTELY NO WARRANTY.\n\n");
  63         fprintf(stderr, "Parameters:\n");
  64         fprintf(stderr, "\t-V --version\t\tPrint Version of Program\n");
  65         fprintf(stderr, "\t-c --count <count>\t"
  66                         "Print <count> number of intervals\n");
  67         fprintf(stderr, "\t-d --dump\t\t"
  68                         "Dump list of available files/keys\n");
  69         fprintf(stderr, "\t-j --json\t\t"
  70                         "Display in JSON format\n");
  71         fprintf(stderr, "\t-f --file <file>\tStatistics file to use\n");
  72         fprintf(stderr, "\t-h --help\t\tThis help message\n");
  73         fprintf(stderr, "\t-i --interval <intv>\t"
  74                         "Set interval to 'intv' seconds\n");
  75         fprintf(stderr, "\t-k --keys k,k,k,...\tDisplay only keys specified\n");
  76         fprintf(stderr, "\t-s --subject [0-2]\t?\n");
  77         fprintf(stderr, "\t-w --width n,n,n,...\tWidth for each field\n");
  78         fprintf(stderr, "\n");
  79
  80         exit(exit_code);
  81 }
  82
  83 struct field_param {
  84         const char *name;
  85         struct lnstat_field *lf;
  86         struct {
  87                 unsigned int width;
  88         } print;
  89 };
  90
  91 struct field_params {
  92         unsigned int num;
  93         struct field_param params[MAX_FIELDS];
  94 };
  95
  96 static void print_line(FILE *of, const struct lnstat_file *lnstat_files,
  97                        const struct field_params *fp)
  98 {
  99         int i;
 100
 101         for (i = 0; i < fp->num; i++) {
 102                 const struct lnstat_field *lf = fp->params[i].lf;
 103
 104                 fprintf(of, "%*lu|", fp->params[i].print.width, lf->result);
 105         }
 106         fputc('\n', of);
 107 }
 108
 109 static void print_json(FILE *of, const struct lnstat_file *lnstat_files,
 110                        const struct field_params *fp)
 111 {
 112         json_writer_t *jw = jsonw_new(of);
 113         int i;
 114
 115         jsonw_start_object(jw);
 116         for (i = 0; i < fp->num; i++) {
 117                 const struct lnstat_field *lf = fp->params[i].lf;
 118
 119                 jsonw_uint_field(jw, lf->name, lf->result);
 120         }
 121         jsonw_end_object(jw);
 122         jsonw_destroy(&jw);
 123 }
 124
 125 /* find lnstat_field according to user specification */
 126 static int map_field_params(struct lnstat_file *lnstat_files,
 127                             struct field_params *fps, int interval)
 128 {
 129         int i, j = 0;
 130         struct lnstat_file *lf;
 131
 132         /* no field specification on commandline, need to build default */
 133         if (!fps->num) {
 134                 for (lf = lnstat_files; lf; lf = lf->next) {
 135                         for (i = 0; i < lf->num_fields; i++) {
 136                                 fps->params[j].lf = &lf->fields[i];
 137                                 fps->params[j].lf->file->interval.tv_sec =
 138                                                                 interval;
 139                                 if (!fps->params[j].print.width)
 140                                         fps->params[j].print.width =
 141                                                         FIELD_WIDTH_DEFAULT;
 142
 143                                 if (++j >= MAX_FIELDS - 1) {
 144                                         fprintf(stderr,
 145                                                 "WARN: MAX_FIELDS (%d) reached,"
 146                                                 " 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] = malloc(HDR_LINE_LENGTH);
 187                 memset(th.hdr[i], 0, HDR_LINE_LENGTH);
 188         }
 189
 190         for (i = 0; i < fps->num; i++) {
 191                 char *cname, *fname = fps->params[i].lf->name;
 192                 unsigned int width = fps->params[i].print.width;
 193
 194                 snprintf(th.hdr[0]+ofs, width+2, "%*.*s|", width, width,
 195                          fps->params[i].lf->file->basename);
 196
 197                 cname = fname;
 198                 for (h = 1; h < HDR_LINES; h++) {
 199                         if (cname - fname >= strlen(fname))
 200                                 snprintf(th.hdr[h]+ofs, width+2,
 201                                          "%*.*s|", width, width, "");
 202                         else {
 203                                 th.num_lines = h+1;
 204                                 snprintf(th.hdr[h]+ofs, width+2,
 205                                          "%*.*s|", width, width, cname);
 206                         }
 207                         cname += width;
 208                 }
 209                 ofs += width+1;
 210         }
 211         /* fill in spaces */
 212         for (h = 1; h <= th.num_lines; h++) {
 213                 for (i = 0; i < ofs; i++) {
 214                         if (th.hdr[h][i] == '\0')
 215                                 th.hdr[h][i] = ' ';
 216                 }
 217         }
 218
 219         return &th;
 220 }
 221
 222 static int print_hdr(FILE *of, struct table_hdr *th)
 223 {
 224         int i;
 225
 226         for (i = 0; i < th->num_lines; i++) {
 227                 fputs(th->hdr[i], of);
 228                 fputc('\n', of);
 229         }
 230         return 0;
 231 }
 232
 233
 234 int main(int argc, char **argv)
 235 {
 236         struct lnstat_file *lnstat_files;
 237         const char *basename;
 238         int i, c;
 239         int interval = DEFAULT_INTERVAL;
 240         int hdr = 2;
 241         enum {
 242                 MODE_DUMP,
 243                 MODE_JSON,
 244                 MODE_NORMAL,
 245         } mode = MODE_NORMAL;
 246         unsigned long count = 0;
 247         struct table_hdr *header;
 248         static struct field_params fp;
 249         int num_req_files = 0;
 250         char *req_files[LNSTAT_MAX_FILES];
 251
 252         /* backwards compatibility mode for old tools */
 253         basename = strrchr(argv[0], '/');
 254         if (basename)
 255                 basename += 1;    /* name after slash */
 256         else
 257                 basename = argv[0]; /* no slash */
 258
 259         if (!strcmp(basename, "rtstat")) {
 260                 /* rtstat compatibility mode */
 261                 req_files[0] = "rt_cache";
 262                 num_req_files = 1;
 263         } else if (!strcmp(basename, "ctstat")) {
 264                 /* ctstat compatibility mode */
 265                 req_files[0] = "ip_conntrack";
 266                 num_req_files = 1;
 267         }
 268
 269         while ((c = getopt_long(argc, argv,"Vc:djpf:h?i:k:s:w:",
 270                                 opts, NULL)) != -1) {
 271                 int len = 0;
 272                 char *tmp, *tok;
 273
 274                 switch (c) {
 275                 case 'c':
 276                         count = strtoul(optarg, NULL, 0);
 277                         break;
 278                 case 'd':
 279                         mode = MODE_DUMP;
 280                         break;
 281                 case 'j':
 282                         mode = MODE_JSON;
 283                         break;
 284                 case 'f':
 285                         req_files[num_req_files++] = strdup(optarg);
 286                         break;
 287                 case '?':
 288                 case 'h':
 289                         usage(argv[0], 0);
 290                         break;
 291                 case 'i':
 292                         sscanf(optarg, "%u", &interval);
 293                         break;
 294                 case 'k':
 295                         tmp = strdup(optarg);
 296                         if (!tmp)
 297                                 break;
 298                         for (tok = strtok(tmp, ",");
 299                              tok;
 300                              tok = strtok(NULL, ",")) {
 301                                 if (fp.num >= MAX_FIELDS) {
 302                                         fprintf(stderr,
 303                                                 "WARN: too many keys"
 304                                                 " 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; ) {
 360                         lnstat_update(lnstat_files);
 361                         if (mode == MODE_JSON)
 362                                 print_json(stdout, lnstat_files, &fp);
 363                         else {
 364                                 if  ((hdr > 1 &&
 365                                       (! (i % 20))) || (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                         if (count)
 373                                 ++i;
 374                 }
 375                 break;
 376         }
 377
 378         return 1;
 379 }