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      1 /* lnstat - Unified linux network statistics
      2  *
      3  * Copyright (C) 2004 by Harald Welte <laforge (at) 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 (at) 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 (at) 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]\tControl header printing:\n");
     77 	fprintf(stderr, "\t\t\t\t0 = never\n");
     78 	fprintf(stderr, "\t\t\t\t1 = once\n");
     79 	fprintf(stderr, "\t\t\t\t2 = every 20 lines (default))\n");
     80 	fprintf(stderr, "\t-w --width n,n,n,...\tWidth for each field\n");
     81 	fprintf(stderr, "\n");
     82 
     83 	exit(exit_code);
     84 }
     85 
     86 struct field_param {
     87 	const char *name;
     88 	struct lnstat_field *lf;
     89 	struct {
     90 		unsigned int width;
     91 	} print;
     92 };
     93 
     94 struct field_params {
     95 	unsigned int num;
     96 	struct field_param params[MAX_FIELDS];
     97 };
     98 
     99 static void print_line(FILE *of, const struct lnstat_file *lnstat_files,
    100 		       const struct field_params *fp)
    101 {
    102 	int i;
    103 
    104 	for (i = 0; i < fp->num; i++) {
    105 		const struct lnstat_field *lf = fp->params[i].lf;
    106 
    107 		fprintf(of, "%*lu|", fp->params[i].print.width, lf->result);
    108 	}
    109 	fputc('\n', of);
    110 }
    111 
    112 static void print_json(FILE *of, const struct lnstat_file *lnstat_files,
    113 		       const struct field_params *fp)
    114 {
    115 	json_writer_t *jw = jsonw_new(of);
    116 	int i;
    117 
    118 	jsonw_start_object(jw);
    119 	for (i = 0; i < fp->num; i++) {
    120 		const struct lnstat_field *lf = fp->params[i].lf;
    121 
    122 		jsonw_uint_field(jw, lf->name, lf->result);
    123 	}
    124 	jsonw_end_object(jw);
    125 	jsonw_destroy(&jw);
    126 }
    127 
    128 /* find lnstat_field according to user specification */
    129 static int map_field_params(struct lnstat_file *lnstat_files,
    130 			    struct field_params *fps, int interval)
    131 {
    132 	int i, j = 0;
    133 	struct lnstat_file *lf;
    134 
    135 	/* no field specification on commandline, need to build default */
    136 	if (!fps->num) {
    137 		for (lf = lnstat_files; lf; lf = lf->next) {
    138 			for (i = 0; i < lf->num_fields; i++) {
    139 				fps->params[j].lf = &lf->fields[i];
    140 				fps->params[j].lf->file->interval.tv_sec =
    141 								interval;
    142 				if (!fps->params[j].print.width)
    143 					fps->params[j].print.width =
    144 							FIELD_WIDTH_DEFAULT;
    145 
    146 				if (++j >= MAX_FIELDS - 1) {
    147 					fprintf(stderr,
    148 						"WARN: MAX_FIELDS (%d) reached,"
    149 						" 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] = malloc(HDR_LINE_LENGTH);
    190 		memset(th.hdr[i], 0, HDR_LINE_LENGTH);
    191 	}
    192 
    193 	for (i = 0; i < fps->num; i++) {
    194 		char *cname, *fname = fps->params[i].lf->name;
    195 		unsigned int width = fps->params[i].print.width;
    196 
    197 		snprintf(th.hdr[0]+ofs, width+2, "%*.*s|", width, width,
    198 			 fps->params[i].lf->file->basename);
    199 
    200 		cname = fname;
    201 		for (h = 1; h < HDR_LINES; h++) {
    202 			if (cname - fname >= strlen(fname))
    203 				snprintf(th.hdr[h]+ofs, width+2,
    204 					 "%*.*s|", width, width, "");
    205 			else {
    206 				th.num_lines = h+1;
    207 				snprintf(th.hdr[h]+ofs, width+2,
    208 					 "%*.*s|", width, width, cname);
    209 			}
    210 			cname += width;
    211 		}
    212 		ofs += width+1;
    213 	}
    214 	/* fill in spaces */
    215 	for (h = 1; h <= th.num_lines; h++) {
    216 		for (i = 0; i < ofs; i++) {
    217 			if (th.hdr[h][i] == '\0')
    218 				th.hdr[h][i] = ' ';
    219 		}
    220 	}
    221 
    222 	return &th;
    223 }
    224 
    225 static int print_hdr(FILE *of, struct table_hdr *th)
    226 {
    227 	int i;
    228 
    229 	for (i = 0; i < th->num_lines; i++) {
    230 		fputs(th->hdr[i], of);
    231 		fputc('\n', of);
    232 	}
    233 	return 0;
    234 }
    235 
    236 
    237 int main(int argc, char **argv)
    238 {
    239 	struct lnstat_file *lnstat_files;
    240 	const char *basename;
    241 	int i, c;
    242 	int interval = DEFAULT_INTERVAL;
    243 	int hdr = 2;
    244 	enum {
    245 		MODE_DUMP,
    246 		MODE_JSON,
    247 		MODE_NORMAL,
    248 	} mode = MODE_NORMAL;
    249 	unsigned long count = 0;
    250 	struct table_hdr *header;
    251 	static struct field_params fp;
    252 	int num_req_files = 0;
    253 	char *req_files[LNSTAT_MAX_FILES];
    254 
    255 	/* backwards compatibility mode for old tools */
    256 	basename = strrchr(argv[0], '/');
    257 	if (basename)
    258 		basename += 1;	  /* name after slash */
    259 	else
    260 		basename = argv[0]; /* no slash */
    261 
    262 	if (!strcmp(basename, "rtstat")) {
    263 		/* rtstat compatibility mode */
    264 		req_files[0] = "rt_cache";
    265 		num_req_files = 1;
    266 	} else if (!strcmp(basename, "ctstat")) {
    267 		/* ctstat compatibility mode */
    268 		req_files[0] = "ip_conntrack";
    269 		num_req_files = 1;
    270 	}
    271 
    272 	while ((c = getopt_long(argc, argv,"Vc:djpf:h?i:k:s:w:",
    273 				opts, NULL)) != -1) {
    274 		int len = 0;
    275 		char *tmp, *tok;
    276 
    277 		switch (c) {
    278 		case 'c':
    279 			count = strtoul(optarg, NULL, 0);
    280 			break;
    281 		case 'd':
    282 			mode = MODE_DUMP;
    283 			break;
    284 		case 'j':
    285 			mode = MODE_JSON;
    286 			break;
    287 		case 'f':
    288 			req_files[num_req_files++] = strdup(optarg);
    289 			break;
    290 		case '?':
    291 		case 'h':
    292 			usage(argv[0], 0);
    293 			break;
    294 		case 'i':
    295 			sscanf(optarg, "%u", &interval);
    296 			break;
    297 		case 'k':
    298 			tmp = strdup(optarg);
    299 			if (!tmp)
    300 				break;
    301 			for (tok = strtok(tmp, ",");
    302 			     tok;
    303 			     tok = strtok(NULL, ",")) {
    304 				if (fp.num >= MAX_FIELDS) {
    305 					fprintf(stderr,
    306 						"WARN: too many keys"
    307 						" requested: (%d max)\n",
    308 						MAX_FIELDS);
    309 					break;
    310 				}
    311 				fp.params[fp.num++].name = tok;
    312 			}
    313 			break;
    314 		case 's':
    315 			sscanf(optarg, "%u", &hdr);
    316 			break;
    317 		case 'w':
    318 			tmp = strdup(optarg);
    319 			if (!tmp)
    320 				break;
    321 			i = 0;
    322 			for (tok = strtok(tmp, ",");
    323 			     tok;
    324 			     tok = strtok(NULL, ",")) {
    325 				len  = strtoul(tok, NULL, 0);
    326 				if (len > FIELD_WIDTH_MAX)
    327 					len = FIELD_WIDTH_MAX;
    328 				fp.params[i].print.width = len;
    329 				i++;
    330 			}
    331 			if (i == 1) {
    332 				for (i = 0; i < MAX_FIELDS; i++)
    333 					fp.params[i].print.width = len;
    334 			}
    335 			break;
    336 		default:
    337 			usage(argv[0], 1);
    338 			break;
    339 		}
    340 	}
    341 
    342 	lnstat_files = lnstat_scan_dir(PROC_NET_STAT, num_req_files,
    343 				       (const char **) req_files);
    344 
    345 	switch (mode) {
    346 	case MODE_DUMP:
    347 		lnstat_dump(stdout, lnstat_files);
    348 		break;
    349 
    350 	case MODE_NORMAL:
    351 	case MODE_JSON:
    352 		if (!map_field_params(lnstat_files, &fp, interval))
    353 			exit(1);
    354 
    355 		header = build_hdr_string(lnstat_files, &fp, 80);
    356 		if (!header)
    357 			exit(1);
    358 
    359 		if (interval < 1 )
    360 			interval = 1;
    361 
    362 		for (i = 0; i < count || !count; i++) {
    363 			lnstat_update(lnstat_files);
    364 			if (mode == MODE_JSON)
    365 				print_json(stdout, lnstat_files, &fp);
    366 			else {
    367 				if  ((hdr > 1 && !(i % 20)) ||
    368 				     (hdr == 1 && i == 0))
    369 					print_hdr(stdout, header);
    370 				print_line(stdout, lnstat_files, &fp);
    371 			}
    372 			fflush(stdout);
    373 			if (i < count - 1 || !count)
    374 				sleep(interval);
    375 		}
    376 		break;
    377 	}
    378 
    379 	return 1;
    380 }
    381